1 /* $NetBSD: tmpfs_subr.c,v 1.35 2007/07/09 21:10:50 ad Exp $ */
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
34 * Efficient memory file system supporting functions.
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/fnv_hash.h>
42 #include <sys/namei.h>
45 #include <sys/random.h>
46 #include <sys/rwlock.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
50 #include <sys/vnode.h>
51 #include <sys/vmmeter.h>
54 #include <vm/vm_param.h>
55 #include <vm/vm_object.h>
56 #include <vm/vm_page.h>
57 #include <vm/vm_pageout.h>
58 #include <vm/vm_pager.h>
59 #include <vm/vm_extern.h>
61 #include <fs/tmpfs/tmpfs.h>
62 #include <fs/tmpfs/tmpfs_fifoops.h>
63 #include <fs/tmpfs/tmpfs_vnops.h>
65 SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system");
67 static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED;
70 sysctl_mem_reserved(SYSCTL_HANDLER_ARGS)
75 pages = *(long *)arg1;
76 bytes = pages * PAGE_SIZE;
78 error = sysctl_handle_long(oidp, &bytes, 0, req);
79 if (error || !req->newptr)
82 pages = bytes / PAGE_SIZE;
83 if (pages < TMPFS_PAGES_MINRESERVED)
86 *(long *)arg1 = pages;
90 SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, memory_reserved, CTLTYPE_LONG|CTLFLAG_RW,
91 &tmpfs_pages_reserved, 0, sysctl_mem_reserved, "L",
92 "Amount of available memory and swap below which tmpfs growth stops");
94 static __inline int tmpfs_dirtree_cmp(struct tmpfs_dirent *a,
95 struct tmpfs_dirent *b);
96 RB_PROTOTYPE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);
103 avail = swap_pager_avail + vm_cnt.v_free_count - tmpfs_pages_reserved;
104 if (__predict_false(avail < 0))
110 tmpfs_pages_used(struct tmpfs_mount *tmp)
112 const size_t node_size = sizeof(struct tmpfs_node) +
113 sizeof(struct tmpfs_dirent);
116 meta_pages = howmany((uintmax_t)tmp->tm_nodes_inuse * node_size,
118 return (meta_pages + tmp->tm_pages_used);
122 tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages)
124 if (tmpfs_mem_avail() < req_pages)
127 if (tmp->tm_pages_max != ULONG_MAX &&
128 tmp->tm_pages_max < req_pages + tmpfs_pages_used(tmp))
135 tmpfs_ref_node(struct tmpfs_node *node)
138 TMPFS_NODE_LOCK(node);
139 tmpfs_ref_node_locked(node);
140 TMPFS_NODE_UNLOCK(node);
144 tmpfs_ref_node_locked(struct tmpfs_node *node)
147 TMPFS_NODE_ASSERT_LOCKED(node);
148 KASSERT(node->tn_refcount > 0, ("node %p zero refcount", node));
149 KASSERT(node->tn_refcount < UINT_MAX, ("node %p refcount %u", node,
155 * Allocates a new node of type 'type' inside the 'tmp' mount point, with
156 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode',
157 * using the credentials of the process 'p'.
159 * If the node type is set to 'VDIR', then the parent parameter must point
160 * to the parent directory of the node being created. It may only be NULL
161 * while allocating the root node.
163 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter
164 * specifies the device the node represents.
166 * If the node type is set to 'VLNK', then the parameter target specifies
167 * the file name of the target file for the symbolic link that is being
170 * Note that new nodes are retrieved from the available list if it has
171 * items or, if it is empty, from the node pool as long as there is enough
172 * space to create them.
174 * Returns zero on success or an appropriate error code on failure.
177 tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *tmp, enum vtype type,
178 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent,
179 char *target, dev_t rdev, struct tmpfs_node **node)
181 struct tmpfs_node *nnode;
184 /* If the root directory of the 'tmp' file system is not yet
185 * allocated, this must be the request to do it. */
186 MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR));
187 KASSERT(tmp->tm_root == NULL || mp->mnt_writeopcount > 0,
188 ("creating node not under vn_start_write"));
190 MPASS(IFF(type == VLNK, target != NULL));
191 MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL));
193 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max)
195 if (tmpfs_pages_check_avail(tmp, 1) == 0)
198 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
200 * When a new tmpfs node is created for fully
201 * constructed mount point, there must be a parent
202 * node, which vnode is locked exclusively. As
203 * consequence, if the unmount is executing in
204 * parallel, vflush() cannot reclaim the parent vnode.
205 * Due to this, the check for MNTK_UNMOUNT flag is not
206 * racy: if we did not see MNTK_UNMOUNT flag, then tmp
207 * cannot be destroyed until node construction is
208 * finished and the parent vnode unlocked.
210 * Tmpfs does not need to instantiate new nodes during
216 nnode = (struct tmpfs_node *)uma_zalloc_arg(tmp->tm_node_pool, tmp,
219 /* Generic initialization. */
220 nnode->tn_type = type;
221 vfs_timestamp(&nnode->tn_atime);
222 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime =
226 nnode->tn_mode = mode;
227 nnode->tn_id = alloc_unr(tmp->tm_ino_unr);
228 nnode->tn_refcount = 1;
230 /* Type-specific initialization. */
231 switch (nnode->tn_type) {
234 nnode->tn_rdev = rdev;
238 RB_INIT(&nnode->tn_dir.tn_dirhead);
239 LIST_INIT(&nnode->tn_dir.tn_dupindex);
240 MPASS(parent != nnode);
241 MPASS(IMPLIES(parent == NULL, tmp->tm_root == NULL));
242 nnode->tn_dir.tn_parent = (parent == NULL) ? nnode : parent;
243 nnode->tn_dir.tn_readdir_lastn = 0;
244 nnode->tn_dir.tn_readdir_lastp = NULL;
246 TMPFS_NODE_LOCK(nnode->tn_dir.tn_parent);
247 nnode->tn_dir.tn_parent->tn_links++;
248 TMPFS_NODE_UNLOCK(nnode->tn_dir.tn_parent);
257 MPASS(strlen(target) < MAXPATHLEN);
258 nnode->tn_size = strlen(target);
259 nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME,
261 memcpy(nnode->tn_link, target, nnode->tn_size);
265 obj = nnode->tn_reg.tn_aobj =
266 vm_pager_allocate(OBJT_SWAP, NULL, 0, VM_PROT_DEFAULT, 0,
267 NULL /* XXXKIB - tmpfs needs swap reservation */);
268 VM_OBJECT_WLOCK(obj);
269 /* OBJ_TMPFS is set together with the setting of vp->v_object */
270 vm_object_set_flag(obj, OBJ_NOSPLIT | OBJ_TMPFS_NODE);
271 vm_object_clear_flag(obj, OBJ_ONEMAPPING);
272 VM_OBJECT_WUNLOCK(obj);
276 panic("tmpfs_alloc_node: type %p %d", nnode,
277 (int)nnode->tn_type);
281 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries);
282 nnode->tn_attached = true;
283 tmp->tm_nodes_inuse++;
292 * Destroys the node pointed to by node from the file system 'tmp'.
293 * If the node references a directory, no entries are allowed.
296 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node)
300 TMPFS_NODE_LOCK(node);
301 if (!tmpfs_free_node_locked(tmp, node, false)) {
302 TMPFS_NODE_UNLOCK(node);
308 tmpfs_free_node_locked(struct tmpfs_mount *tmp, struct tmpfs_node *node,
313 TMPFS_MP_ASSERT_LOCKED(tmp);
314 TMPFS_NODE_ASSERT_LOCKED(node);
315 KASSERT(node->tn_refcount > 0, ("node %p refcount zero", node));
318 if (node->tn_attached && (detach || node->tn_refcount == 0)) {
319 MPASS(tmp->tm_nodes_inuse > 0);
320 tmp->tm_nodes_inuse--;
321 LIST_REMOVE(node, tn_entries);
322 node->tn_attached = false;
324 if (node->tn_refcount > 0)
328 MPASS(node->tn_vnode == NULL);
329 MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0);
331 TMPFS_NODE_UNLOCK(node);
334 switch (node->tn_type) {
347 free(node->tn_link, M_TMPFSNAME);
351 uobj = node->tn_reg.tn_aobj;
353 atomic_subtract_long(&tmp->tm_pages_used, uobj->size);
354 KASSERT((uobj->flags & OBJ_TMPFS) == 0,
355 ("leaked OBJ_TMPFS node %p vm_obj %p", node, uobj));
356 vm_object_deallocate(uobj);
361 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type);
364 free_unr(tmp->tm_ino_unr, node->tn_id);
365 uma_zfree(tmp->tm_node_pool, node);
371 static __inline uint32_t
372 tmpfs_dirent_hash(const char *name, u_int len)
376 hash = fnv_32_buf(name, len, FNV1_32_INIT + len) & TMPFS_DIRCOOKIE_MASK;
377 #ifdef TMPFS_DEBUG_DIRCOOKIE_DUP
380 if (hash < TMPFS_DIRCOOKIE_MIN)
381 hash += TMPFS_DIRCOOKIE_MIN;
386 static __inline off_t
387 tmpfs_dirent_cookie(struct tmpfs_dirent *de)
390 return (TMPFS_DIRCOOKIE_EOF);
392 MPASS(de->td_cookie >= TMPFS_DIRCOOKIE_MIN);
394 return (de->td_cookie);
397 static __inline boolean_t
398 tmpfs_dirent_dup(struct tmpfs_dirent *de)
400 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUP) != 0);
403 static __inline boolean_t
404 tmpfs_dirent_duphead(struct tmpfs_dirent *de)
406 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUPHEAD) != 0);
410 tmpfs_dirent_init(struct tmpfs_dirent *de, const char *name, u_int namelen)
412 de->td_hash = de->td_cookie = tmpfs_dirent_hash(name, namelen);
413 memcpy(de->ud.td_name, name, namelen);
414 de->td_namelen = namelen;
418 * Allocates a new directory entry for the node node with a name of name.
419 * The new directory entry is returned in *de.
421 * The link count of node is increased by one to reflect the new object
424 * Returns zero on success or an appropriate error code on failure.
427 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node,
428 const char *name, u_int len, struct tmpfs_dirent **de)
430 struct tmpfs_dirent *nde;
432 nde = uma_zalloc(tmp->tm_dirent_pool, M_WAITOK);
435 nde->ud.td_name = malloc(len, M_TMPFSNAME, M_WAITOK);
436 tmpfs_dirent_init(nde, name, len);
448 * Frees a directory entry. It is the caller's responsibility to destroy
449 * the node referenced by it if needed.
451 * The link count of node is decreased by one to reflect the removal of an
452 * object that referenced it. This only happens if 'node_exists' is true;
453 * otherwise the function will not access the node referred to by the
454 * directory entry, as it may already have been released from the outside.
457 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de)
459 struct tmpfs_node *node;
463 MPASS(node->tn_links > 0);
466 if (!tmpfs_dirent_duphead(de) && de->ud.td_name != NULL)
467 free(de->ud.td_name, M_TMPFSNAME);
468 uma_zfree(tmp->tm_dirent_pool, de);
472 tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj)
475 ASSERT_VOP_ELOCKED(vp, "tmpfs_destroy_vobject");
476 if (vp->v_type != VREG || obj == NULL)
479 VM_OBJECT_WLOCK(obj);
481 vm_object_clear_flag(obj, OBJ_TMPFS);
482 obj->un_pager.swp.swp_tmpfs = NULL;
484 VM_OBJECT_WUNLOCK(obj);
488 * Need to clear v_object for insmntque failure.
491 tmpfs_insmntque_dtr(struct vnode *vp, void *dtr_arg)
494 tmpfs_destroy_vobject(vp, vp->v_object);
497 vp->v_op = &dead_vnodeops;
503 * Allocates a new vnode for the node node or returns a new reference to
504 * an existing one if the node had already a vnode referencing it. The
505 * resulting locked vnode is returned in *vpp.
507 * Returns zero on success or an appropriate error code on failure.
510 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag,
514 struct tmpfs_mount *tm;
519 tm = VFS_TO_TMPFS(mp);
520 TMPFS_NODE_LOCK(node);
521 tmpfs_ref_node_locked(node);
523 TMPFS_NODE_ASSERT_LOCKED(node);
524 if ((vp = node->tn_vnode) != NULL) {
525 MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0);
527 if ((node->tn_type == VDIR && node->tn_dir.tn_parent == NULL) ||
528 ((vp->v_iflag & VI_DOOMED) != 0 &&
529 (lkflag & LK_NOWAIT) != 0)) {
531 TMPFS_NODE_UNLOCK(node);
536 if ((vp->v_iflag & VI_DOOMED) != 0) {
538 node->tn_vpstate |= TMPFS_VNODE_WRECLAIM;
539 while ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) {
540 msleep(&node->tn_vnode, TMPFS_NODE_MTX(node),
545 TMPFS_NODE_UNLOCK(node);
546 error = vget(vp, lkflag | LK_INTERLOCK, curthread);
547 if (error == ENOENT) {
548 TMPFS_NODE_LOCK(node);
557 * Make sure the vnode is still there after
558 * getting the interlock to avoid racing a free.
560 if (node->tn_vnode == NULL || node->tn_vnode != vp) {
562 TMPFS_NODE_LOCK(node);
569 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) ||
570 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) {
571 TMPFS_NODE_UNLOCK(node);
578 * otherwise lock the vp list while we call getnewvnode
579 * since that can block.
581 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) {
582 node->tn_vpstate |= TMPFS_VNODE_WANT;
583 error = msleep((caddr_t) &node->tn_vpstate,
584 TMPFS_NODE_MTX(node), 0, "tmpfs_alloc_vp", 0);
589 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING;
591 TMPFS_NODE_UNLOCK(node);
593 /* Get a new vnode and associate it with our node. */
594 error = getnewvnode("tmpfs", mp, VFS_TO_TMPFS(mp)->tm_nonc ?
595 &tmpfs_vnodeop_nonc_entries : &tmpfs_vnodeop_entries, &vp);
600 /* lkflag is ignored, the lock is exclusive */
601 (void) vn_lock(vp, lkflag | LK_RETRY);
604 vp->v_type = node->tn_type;
606 /* Type-specific initialization. */
607 switch (node->tn_type) {
617 vp->v_op = &tmpfs_fifoop_entries;
620 object = node->tn_reg.tn_aobj;
621 VM_OBJECT_WLOCK(object);
623 KASSERT(vp->v_object == NULL, ("Not NULL v_object in tmpfs"));
624 vp->v_object = object;
625 object->un_pager.swp.swp_tmpfs = vp;
626 vm_object_set_flag(object, OBJ_TMPFS);
628 VM_OBJECT_WUNLOCK(object);
631 MPASS(node->tn_dir.tn_parent != NULL);
632 if (node->tn_dir.tn_parent == node)
633 vp->v_vflag |= VV_ROOT;
637 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type);
639 if (vp->v_type != VFIFO)
642 error = insmntque1(vp, mp, tmpfs_insmntque_dtr, NULL);
647 TMPFS_NODE_LOCK(node);
649 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING);
650 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING;
653 if (node->tn_vpstate & TMPFS_VNODE_WANT) {
654 node->tn_vpstate &= ~TMPFS_VNODE_WANT;
655 TMPFS_NODE_UNLOCK(node);
656 wakeup((caddr_t) &node->tn_vpstate);
658 TMPFS_NODE_UNLOCK(node);
665 MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp));
666 TMPFS_NODE_LOCK(node);
667 MPASS(*vpp == node->tn_vnode);
668 TMPFS_NODE_UNLOCK(node);
671 tmpfs_free_node(tm, node);
677 * Destroys the association between the vnode vp and the node it
681 tmpfs_free_vp(struct vnode *vp)
683 struct tmpfs_node *node;
685 node = VP_TO_TMPFS_NODE(vp);
687 TMPFS_NODE_ASSERT_LOCKED(node);
688 node->tn_vnode = NULL;
689 if ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0)
690 wakeup(&node->tn_vnode);
691 node->tn_vpstate &= ~TMPFS_VNODE_WRECLAIM;
696 * Allocates a new file of type 'type' and adds it to the parent directory
697 * 'dvp'; this addition is done using the component name given in 'cnp'.
698 * The ownership of the new file is automatically assigned based on the
699 * credentials of the caller (through 'cnp'), the group is set based on
700 * the parent directory and the mode is determined from the 'vap' argument.
701 * If successful, *vpp holds a vnode to the newly created file and zero
702 * is returned. Otherwise *vpp is NULL and the function returns an
703 * appropriate error code.
706 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap,
707 struct componentname *cnp, char *target)
710 struct tmpfs_dirent *de;
711 struct tmpfs_mount *tmp;
712 struct tmpfs_node *dnode;
713 struct tmpfs_node *node;
714 struct tmpfs_node *parent;
716 ASSERT_VOP_ELOCKED(dvp, "tmpfs_alloc_file");
717 MPASS(cnp->cn_flags & HASBUF);
719 tmp = VFS_TO_TMPFS(dvp->v_mount);
720 dnode = VP_TO_TMPFS_DIR(dvp);
723 /* If the entry we are creating is a directory, we cannot overflow
724 * the number of links of its parent, because it will get a new
726 if (vap->va_type == VDIR) {
727 /* Ensure that we do not overflow the maximum number of links
728 * imposed by the system. */
729 MPASS(dnode->tn_links <= LINK_MAX);
730 if (dnode->tn_links == LINK_MAX) {
735 MPASS(parent != NULL);
739 /* Allocate a node that represents the new file. */
740 error = tmpfs_alloc_node(dvp->v_mount, tmp, vap->va_type,
741 cnp->cn_cred->cr_uid, dnode->tn_gid, vap->va_mode, parent,
742 target, vap->va_rdev, &node);
746 /* Allocate a directory entry that points to the new file. */
747 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen,
750 tmpfs_free_node(tmp, node);
754 /* Allocate a vnode for the new file. */
755 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp);
757 tmpfs_free_dirent(tmp, de);
758 tmpfs_free_node(tmp, node);
762 /* Now that all required items are allocated, we can proceed to
763 * insert the new node into the directory, an operation that
765 if (cnp->cn_flags & ISWHITEOUT)
766 tmpfs_dir_whiteout_remove(dvp, cnp);
767 tmpfs_dir_attach(dvp, de);
771 struct tmpfs_dirent *
772 tmpfs_dir_first(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
774 struct tmpfs_dirent *de;
776 de = RB_MIN(tmpfs_dir, &dnode->tn_dir.tn_dirhead);
778 if (de != NULL && tmpfs_dirent_duphead(de))
779 de = LIST_FIRST(&de->ud.td_duphead);
780 dc->tdc_current = de;
782 return (dc->tdc_current);
785 struct tmpfs_dirent *
786 tmpfs_dir_next(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
788 struct tmpfs_dirent *de;
790 MPASS(dc->tdc_tree != NULL);
791 if (tmpfs_dirent_dup(dc->tdc_current)) {
792 dc->tdc_current = LIST_NEXT(dc->tdc_current, uh.td_dup.entries);
793 if (dc->tdc_current != NULL)
794 return (dc->tdc_current);
796 dc->tdc_tree = dc->tdc_current = RB_NEXT(tmpfs_dir,
797 &dnode->tn_dir.tn_dirhead, dc->tdc_tree);
798 if ((de = dc->tdc_current) != NULL && tmpfs_dirent_duphead(de)) {
799 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
800 MPASS(dc->tdc_current != NULL);
803 return (dc->tdc_current);
806 /* Lookup directory entry in RB-Tree. Function may return duphead entry. */
807 static struct tmpfs_dirent *
808 tmpfs_dir_xlookup_hash(struct tmpfs_node *dnode, uint32_t hash)
810 struct tmpfs_dirent *de, dekey;
812 dekey.td_hash = hash;
813 de = RB_FIND(tmpfs_dir, &dnode->tn_dir.tn_dirhead, &dekey);
817 /* Lookup directory entry by cookie, initialize directory cursor accordingly. */
818 static struct tmpfs_dirent *
819 tmpfs_dir_lookup_cookie(struct tmpfs_node *node, off_t cookie,
820 struct tmpfs_dir_cursor *dc)
822 struct tmpfs_dir *dirhead = &node->tn_dir.tn_dirhead;
823 struct tmpfs_dirent *de, dekey;
825 MPASS(cookie >= TMPFS_DIRCOOKIE_MIN);
827 if (cookie == node->tn_dir.tn_readdir_lastn &&
828 (de = node->tn_dir.tn_readdir_lastp) != NULL) {
829 /* Protect against possible race, tn_readdir_last[pn]
830 * may be updated with only shared vnode lock held. */
831 if (cookie == tmpfs_dirent_cookie(de))
835 if ((cookie & TMPFS_DIRCOOKIE_DUP) != 0) {
836 LIST_FOREACH(de, &node->tn_dir.tn_dupindex,
837 uh.td_dup.index_entries) {
838 MPASS(tmpfs_dirent_dup(de));
839 if (de->td_cookie == cookie)
841 /* dupindex list is sorted. */
842 if (de->td_cookie < cookie) {
851 if ((cookie & TMPFS_DIRCOOKIE_MASK) != cookie) {
854 dekey.td_hash = cookie;
855 /* Recover if direntry for cookie was removed */
856 de = RB_NFIND(tmpfs_dir, dirhead, &dekey);
859 dc->tdc_current = de;
860 if (de != NULL && tmpfs_dirent_duphead(de)) {
861 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
862 MPASS(dc->tdc_current != NULL);
864 return (dc->tdc_current);
868 dc->tdc_current = de;
869 if (de != NULL && tmpfs_dirent_dup(de))
870 dc->tdc_tree = tmpfs_dir_xlookup_hash(node,
872 return (dc->tdc_current);
876 * Looks for a directory entry in the directory represented by node.
877 * 'cnp' describes the name of the entry to look for. Note that the .
878 * and .. components are not allowed as they do not physically exist
879 * within directories.
881 * Returns a pointer to the entry when found, otherwise NULL.
883 struct tmpfs_dirent *
884 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f,
885 struct componentname *cnp)
887 struct tmpfs_dir_duphead *duphead;
888 struct tmpfs_dirent *de;
891 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.'));
892 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' &&
893 cnp->cn_nameptr[1] == '.')));
894 TMPFS_VALIDATE_DIR(node);
896 hash = tmpfs_dirent_hash(cnp->cn_nameptr, cnp->cn_namelen);
897 de = tmpfs_dir_xlookup_hash(node, hash);
898 if (de != NULL && tmpfs_dirent_duphead(de)) {
899 duphead = &de->ud.td_duphead;
900 LIST_FOREACH(de, duphead, uh.td_dup.entries) {
901 if (TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
905 } else if (de != NULL) {
906 if (!TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
910 if (de != NULL && f != NULL && de->td_node != f)
917 * Attach duplicate-cookie directory entry nde to dnode and insert to dupindex
918 * list, allocate new cookie value.
921 tmpfs_dir_attach_dup(struct tmpfs_node *dnode,
922 struct tmpfs_dir_duphead *duphead, struct tmpfs_dirent *nde)
924 struct tmpfs_dir_duphead *dupindex;
925 struct tmpfs_dirent *de, *pde;
927 dupindex = &dnode->tn_dir.tn_dupindex;
928 de = LIST_FIRST(dupindex);
929 if (de == NULL || de->td_cookie < TMPFS_DIRCOOKIE_DUP_MAX) {
931 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
933 nde->td_cookie = de->td_cookie + 1;
934 MPASS(tmpfs_dirent_dup(nde));
935 LIST_INSERT_HEAD(dupindex, nde, uh.td_dup.index_entries);
936 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
941 * Cookie numbers are near exhaustion. Scan dupindex list for unused
942 * numbers. dupindex list is sorted in descending order. Keep it so
943 * after inserting nde.
947 de = LIST_NEXT(de, uh.td_dup.index_entries);
948 if (de == NULL && pde->td_cookie != TMPFS_DIRCOOKIE_DUP_MIN) {
950 * Last element of the index doesn't have minimal cookie
953 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
954 LIST_INSERT_AFTER(pde, nde, uh.td_dup.index_entries);
955 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
957 } else if (de == NULL) {
959 * We are so lucky have 2^30 hash duplicates in single
960 * directory :) Return largest possible cookie value.
961 * It should be fine except possible issues with
962 * VOP_READDIR restart.
964 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MAX;
965 LIST_INSERT_HEAD(dupindex, nde,
966 uh.td_dup.index_entries);
967 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
970 if (de->td_cookie + 1 == pde->td_cookie ||
971 de->td_cookie >= TMPFS_DIRCOOKIE_DUP_MAX)
972 continue; /* No hole or invalid cookie. */
973 nde->td_cookie = de->td_cookie + 1;
974 MPASS(tmpfs_dirent_dup(nde));
975 MPASS(pde->td_cookie > nde->td_cookie);
976 MPASS(nde->td_cookie > de->td_cookie);
977 LIST_INSERT_BEFORE(de, nde, uh.td_dup.index_entries);
978 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
984 * Attaches the directory entry de to the directory represented by vp.
985 * Note that this does not change the link count of the node pointed by
986 * the directory entry, as this is done by tmpfs_alloc_dirent.
989 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de)
991 struct tmpfs_node *dnode;
992 struct tmpfs_dirent *xde, *nde;
994 ASSERT_VOP_ELOCKED(vp, __func__);
995 MPASS(de->td_namelen > 0);
996 MPASS(de->td_hash >= TMPFS_DIRCOOKIE_MIN);
997 MPASS(de->td_cookie == de->td_hash);
999 dnode = VP_TO_TMPFS_DIR(vp);
1000 dnode->tn_dir.tn_readdir_lastn = 0;
1001 dnode->tn_dir.tn_readdir_lastp = NULL;
1003 MPASS(!tmpfs_dirent_dup(de));
1004 xde = RB_INSERT(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
1005 if (xde != NULL && tmpfs_dirent_duphead(xde))
1006 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
1007 else if (xde != NULL) {
1009 * Allocate new duphead. Swap xde with duphead to avoid
1010 * adding/removing elements with the same hash.
1012 MPASS(!tmpfs_dirent_dup(xde));
1013 tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), NULL, NULL, 0,
1015 /* *nde = *xde; XXX gcc 4.2.1 may generate invalid code. */
1016 memcpy(nde, xde, sizeof(*xde));
1017 xde->td_cookie |= TMPFS_DIRCOOKIE_DUPHEAD;
1018 LIST_INIT(&xde->ud.td_duphead);
1019 xde->td_namelen = 0;
1020 xde->td_node = NULL;
1021 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, nde);
1022 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
1024 dnode->tn_size += sizeof(struct tmpfs_dirent);
1025 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1026 TMPFS_NODE_MODIFIED;
1031 * Detaches the directory entry de from the directory represented by vp.
1032 * Note that this does not change the link count of the node pointed by
1033 * the directory entry, as this is done by tmpfs_free_dirent.
1036 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de)
1038 struct tmpfs_mount *tmp;
1039 struct tmpfs_dir *head;
1040 struct tmpfs_node *dnode;
1041 struct tmpfs_dirent *xde;
1043 ASSERT_VOP_ELOCKED(vp, __func__);
1045 dnode = VP_TO_TMPFS_DIR(vp);
1046 head = &dnode->tn_dir.tn_dirhead;
1047 dnode->tn_dir.tn_readdir_lastn = 0;
1048 dnode->tn_dir.tn_readdir_lastp = NULL;
1050 if (tmpfs_dirent_dup(de)) {
1051 /* Remove duphead if de was last entry. */
1052 if (LIST_NEXT(de, uh.td_dup.entries) == NULL) {
1053 xde = tmpfs_dir_xlookup_hash(dnode, de->td_hash);
1054 MPASS(tmpfs_dirent_duphead(xde));
1057 LIST_REMOVE(de, uh.td_dup.entries);
1058 LIST_REMOVE(de, uh.td_dup.index_entries);
1060 if (LIST_EMPTY(&xde->ud.td_duphead)) {
1061 RB_REMOVE(tmpfs_dir, head, xde);
1062 tmp = VFS_TO_TMPFS(vp->v_mount);
1063 MPASS(xde->td_node == NULL);
1064 tmpfs_free_dirent(tmp, xde);
1067 de->td_cookie = de->td_hash;
1069 RB_REMOVE(tmpfs_dir, head, de);
1071 dnode->tn_size -= sizeof(struct tmpfs_dirent);
1072 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1073 TMPFS_NODE_MODIFIED;
1078 tmpfs_dir_destroy(struct tmpfs_mount *tmp, struct tmpfs_node *dnode)
1080 struct tmpfs_dirent *de, *dde, *nde;
1082 RB_FOREACH_SAFE(de, tmpfs_dir, &dnode->tn_dir.tn_dirhead, nde) {
1083 RB_REMOVE(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
1084 /* Node may already be destroyed. */
1086 if (tmpfs_dirent_duphead(de)) {
1087 while ((dde = LIST_FIRST(&de->ud.td_duphead)) != NULL) {
1088 LIST_REMOVE(dde, uh.td_dup.entries);
1089 dde->td_node = NULL;
1090 tmpfs_free_dirent(tmp, dde);
1093 tmpfs_free_dirent(tmp, de);
1098 * Helper function for tmpfs_readdir. Creates a '.' entry for the given
1099 * directory and returns it in the uio space. The function returns 0
1100 * on success, -1 if there was not enough space in the uio structure to
1101 * hold the directory entry or an appropriate error code if another
1105 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio)
1110 TMPFS_VALIDATE_DIR(node);
1111 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT);
1113 dent.d_fileno = node->tn_id;
1114 dent.d_type = DT_DIR;
1116 dent.d_name[0] = '.';
1117 dent.d_name[1] = '\0';
1118 dent.d_reclen = GENERIC_DIRSIZ(&dent);
1120 if (dent.d_reclen > uio->uio_resid)
1121 error = EJUSTRETURN;
1123 error = uiomove(&dent, dent.d_reclen, uio);
1125 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
1131 * Helper function for tmpfs_readdir. Creates a '..' entry for the given
1132 * directory and returns it in the uio space. The function returns 0
1133 * on success, -1 if there was not enough space in the uio structure to
1134 * hold the directory entry or an appropriate error code if another
1138 tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio)
1143 TMPFS_VALIDATE_DIR(node);
1144 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT);
1147 * Return ENOENT if the current node is already removed.
1149 TMPFS_ASSERT_LOCKED(node);
1150 if (node->tn_dir.tn_parent == NULL)
1153 TMPFS_NODE_LOCK(node->tn_dir.tn_parent);
1154 dent.d_fileno = node->tn_dir.tn_parent->tn_id;
1155 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent);
1157 dent.d_type = DT_DIR;
1159 dent.d_name[0] = '.';
1160 dent.d_name[1] = '.';
1161 dent.d_name[2] = '\0';
1162 dent.d_reclen = GENERIC_DIRSIZ(&dent);
1164 if (dent.d_reclen > uio->uio_resid)
1165 error = EJUSTRETURN;
1167 error = uiomove(&dent, dent.d_reclen, uio);
1169 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
1175 * Helper function for tmpfs_readdir. Returns as much directory entries
1176 * as can fit in the uio space. The read starts at uio->uio_offset.
1177 * The function returns 0 on success, -1 if there was not enough space
1178 * in the uio structure to hold the directory entry or an appropriate
1179 * error code if another error happens.
1182 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, int maxcookies,
1183 u_long *cookies, int *ncookies)
1185 struct tmpfs_dir_cursor dc;
1186 struct tmpfs_dirent *de;
1190 TMPFS_VALIDATE_DIR(node);
1195 * Lookup the node from the current offset. The starting offset of
1196 * 0 will lookup both '.' and '..', and then the first real entry,
1197 * or EOF if there are none. Then find all entries for the dir that
1198 * fit into the buffer. Once no more entries are found (de == NULL),
1199 * the offset is set to TMPFS_DIRCOOKIE_EOF, which will cause the next
1202 switch (uio->uio_offset) {
1203 case TMPFS_DIRCOOKIE_DOT:
1204 error = tmpfs_dir_getdotdent(node, uio);
1207 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT;
1208 if (cookies != NULL)
1209 cookies[(*ncookies)++] = off = uio->uio_offset;
1211 case TMPFS_DIRCOOKIE_DOTDOT:
1212 error = tmpfs_dir_getdotdotdent(node, uio);
1215 de = tmpfs_dir_first(node, &dc);
1216 uio->uio_offset = tmpfs_dirent_cookie(de);
1217 if (cookies != NULL)
1218 cookies[(*ncookies)++] = off = uio->uio_offset;
1223 case TMPFS_DIRCOOKIE_EOF:
1226 de = tmpfs_dir_lookup_cookie(node, uio->uio_offset, &dc);
1229 if (cookies != NULL)
1230 off = tmpfs_dirent_cookie(de);
1233 /* Read as much entries as possible; i.e., until we reach the end of
1234 * the directory or we exhaust uio space. */
1238 /* Create a dirent structure representing the current
1239 * tmpfs_node and fill it. */
1240 if (de->td_node == NULL) {
1244 d.d_fileno = de->td_node->tn_id;
1245 switch (de->td_node->tn_type) {
1275 panic("tmpfs_dir_getdents: type %p %d",
1276 de->td_node, (int)de->td_node->tn_type);
1279 d.d_namlen = de->td_namelen;
1280 MPASS(de->td_namelen < sizeof(d.d_name));
1281 (void)memcpy(d.d_name, de->ud.td_name, de->td_namelen);
1282 d.d_name[de->td_namelen] = '\0';
1283 d.d_reclen = GENERIC_DIRSIZ(&d);
1285 /* Stop reading if the directory entry we are treating is
1286 * bigger than the amount of data that can be returned. */
1287 if (d.d_reclen > uio->uio_resid) {
1288 error = EJUSTRETURN;
1292 /* Copy the new dirent structure into the output buffer and
1293 * advance pointers. */
1294 error = uiomove(&d, d.d_reclen, uio);
1296 de = tmpfs_dir_next(node, &dc);
1297 if (cookies != NULL) {
1298 off = tmpfs_dirent_cookie(de);
1299 MPASS(*ncookies < maxcookies);
1300 cookies[(*ncookies)++] = off;
1303 } while (error == 0 && uio->uio_resid > 0 && de != NULL);
1305 /* Skip setting off when using cookies as it is already done above. */
1306 if (cookies == NULL)
1307 off = tmpfs_dirent_cookie(de);
1309 /* Update the offset and cache. */
1310 uio->uio_offset = off;
1311 node->tn_dir.tn_readdir_lastn = off;
1312 node->tn_dir.tn_readdir_lastp = de;
1314 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
1319 tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp)
1321 struct tmpfs_dirent *de;
1324 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL,
1325 cnp->cn_nameptr, cnp->cn_namelen, &de);
1328 tmpfs_dir_attach(dvp, de);
1333 tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp)
1335 struct tmpfs_dirent *de;
1337 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1338 MPASS(de != NULL && de->td_node == NULL);
1339 tmpfs_dir_detach(dvp, de);
1340 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de);
1344 * Resizes the aobj associated with the regular file pointed to by 'vp' to the
1345 * size 'newsize'. 'vp' must point to a vnode that represents a regular file.
1346 * 'newsize' must be positive.
1348 * Returns zero on success or an appropriate error code on failure.
1351 tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr)
1353 struct tmpfs_mount *tmp;
1354 struct tmpfs_node *node;
1357 vm_pindex_t idx, newpages, oldpages;
1361 MPASS(vp->v_type == VREG);
1362 MPASS(newsize >= 0);
1364 node = VP_TO_TMPFS_NODE(vp);
1365 uobj = node->tn_reg.tn_aobj;
1366 tmp = VFS_TO_TMPFS(vp->v_mount);
1369 * Convert the old and new sizes to the number of pages needed to
1370 * store them. It may happen that we do not need to do anything
1371 * because the last allocated page can accommodate the change on
1374 oldsize = node->tn_size;
1375 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK);
1376 MPASS(oldpages == uobj->size);
1377 newpages = OFF_TO_IDX(newsize + PAGE_MASK);
1378 if (newpages > oldpages &&
1379 tmpfs_pages_check_avail(tmp, newpages - oldpages) == 0)
1382 VM_OBJECT_WLOCK(uobj);
1383 if (newsize < oldsize) {
1385 * Zero the truncated part of the last page.
1387 base = newsize & PAGE_MASK;
1389 idx = OFF_TO_IDX(newsize);
1391 m = vm_page_lookup(uobj, idx);
1393 if (vm_page_sleep_if_busy(m, "tmfssz"))
1395 MPASS(m->valid == VM_PAGE_BITS_ALL);
1396 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) {
1397 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL);
1399 VM_OBJECT_WUNLOCK(uobj);
1401 VM_OBJECT_WLOCK(uobj);
1404 rv = vm_pager_get_pages(uobj, &m, 1, NULL,
1407 if (rv == VM_PAGER_OK) {
1409 * Since the page was not resident,
1410 * and therefore not recently
1411 * accessed, immediately enqueue it
1412 * for asynchronous laundering. The
1413 * current operation is not regarded
1425 VM_OBJECT_WUNLOCK(uobj);
1431 pmap_zero_page_area(m, base, PAGE_SIZE - base);
1433 vm_pager_page_unswapped(m);
1438 * Release any swap space and free any whole pages.
1440 if (newpages < oldpages) {
1441 swap_pager_freespace(uobj, newpages, oldpages -
1443 vm_object_page_remove(uobj, newpages, 0, 0);
1446 uobj->size = newpages;
1447 VM_OBJECT_WUNLOCK(uobj);
1449 atomic_add_long(&tmp->tm_pages_used, newpages - oldpages);
1451 node->tn_size = newsize;
1456 tmpfs_check_mtime(struct vnode *vp)
1458 struct tmpfs_node *node;
1459 struct vm_object *obj;
1461 ASSERT_VOP_ELOCKED(vp, "check_mtime");
1462 if (vp->v_type != VREG)
1465 KASSERT((obj->flags & (OBJ_TMPFS_NODE | OBJ_TMPFS)) ==
1466 (OBJ_TMPFS_NODE | OBJ_TMPFS), ("non-tmpfs obj"));
1468 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) {
1469 VM_OBJECT_WLOCK(obj);
1470 if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) {
1471 obj->flags &= ~OBJ_TMPFS_DIRTY;
1472 node = VP_TO_TMPFS_NODE(vp);
1473 node->tn_status |= TMPFS_NODE_MODIFIED |
1476 VM_OBJECT_WUNLOCK(obj);
1481 * Change flags of the given vnode.
1482 * Caller should execute tmpfs_update on vp after a successful execution.
1483 * The vnode must be locked on entry and remain locked on exit.
1486 tmpfs_chflags(struct vnode *vp, u_long flags, struct ucred *cred,
1490 struct tmpfs_node *node;
1492 ASSERT_VOP_ELOCKED(vp, "chflags");
1494 node = VP_TO_TMPFS_NODE(vp);
1496 if ((flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE | SF_NOUNLINK |
1497 UF_APPEND | UF_ARCHIVE | UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP |
1498 UF_NOUNLINK | UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
1499 UF_SPARSE | UF_SYSTEM)) != 0)
1500 return (EOPNOTSUPP);
1502 /* Disallow this operation if the file system is mounted read-only. */
1503 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1507 * Callers may only modify the file flags on objects they
1508 * have VADMIN rights for.
1510 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1513 * Unprivileged processes are not permitted to unset system
1514 * flags, or modify flags if any system flags are set.
1516 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
1517 if (node->tn_flags &
1518 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
1519 error = securelevel_gt(cred, 0);
1524 if (node->tn_flags &
1525 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
1526 ((flags ^ node->tn_flags) & SF_SETTABLE))
1529 node->tn_flags = flags;
1530 node->tn_status |= TMPFS_NODE_CHANGED;
1532 ASSERT_VOP_ELOCKED(vp, "chflags2");
1538 * Change access mode on the given vnode.
1539 * Caller should execute tmpfs_update on vp after a successful execution.
1540 * The vnode must be locked on entry and remain locked on exit.
1543 tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p)
1546 struct tmpfs_node *node;
1548 ASSERT_VOP_ELOCKED(vp, "chmod");
1550 node = VP_TO_TMPFS_NODE(vp);
1552 /* Disallow this operation if the file system is mounted read-only. */
1553 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1556 /* Immutable or append-only files cannot be modified, either. */
1557 if (node->tn_flags & (IMMUTABLE | APPEND))
1561 * To modify the permissions on a file, must possess VADMIN
1564 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1568 * Privileged processes may set the sticky bit on non-directories,
1569 * as well as set the setgid bit on a file with a group that the
1570 * process is not a member of.
1572 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
1573 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
1576 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) {
1577 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
1583 node->tn_mode &= ~ALLPERMS;
1584 node->tn_mode |= mode & ALLPERMS;
1586 node->tn_status |= TMPFS_NODE_CHANGED;
1588 ASSERT_VOP_ELOCKED(vp, "chmod2");
1594 * Change ownership of the given vnode. At least one of uid or gid must
1595 * be different than VNOVAL. If one is set to that value, the attribute
1597 * Caller should execute tmpfs_update on vp after a successful execution.
1598 * The vnode must be locked on entry and remain locked on exit.
1601 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
1605 struct tmpfs_node *node;
1609 ASSERT_VOP_ELOCKED(vp, "chown");
1611 node = VP_TO_TMPFS_NODE(vp);
1613 /* Assign default values if they are unknown. */
1614 MPASS(uid != VNOVAL || gid != VNOVAL);
1619 MPASS(uid != VNOVAL && gid != VNOVAL);
1621 /* Disallow this operation if the file system is mounted read-only. */
1622 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1625 /* Immutable or append-only files cannot be modified, either. */
1626 if (node->tn_flags & (IMMUTABLE | APPEND))
1630 * To modify the ownership of a file, must possess VADMIN for that
1633 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1637 * To change the owner of a file, or change the group of a file to a
1638 * group of which we are not a member, the caller must have
1641 if ((uid != node->tn_uid ||
1642 (gid != node->tn_gid && !groupmember(gid, cred))) &&
1643 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
1646 ogid = node->tn_gid;
1647 ouid = node->tn_uid;
1652 node->tn_status |= TMPFS_NODE_CHANGED;
1654 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) {
1655 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0))
1656 node->tn_mode &= ~(S_ISUID | S_ISGID);
1659 ASSERT_VOP_ELOCKED(vp, "chown2");
1665 * Change size of the given vnode.
1666 * Caller should execute tmpfs_update on vp after a successful execution.
1667 * The vnode must be locked on entry and remain locked on exit.
1670 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred,
1674 struct tmpfs_node *node;
1676 ASSERT_VOP_ELOCKED(vp, "chsize");
1678 node = VP_TO_TMPFS_NODE(vp);
1680 /* Decide whether this is a valid operation based on the file type. */
1682 switch (vp->v_type) {
1687 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1696 /* Allow modifications of special files even if in the file
1697 * system is mounted read-only (we are not modifying the
1698 * files themselves, but the objects they represent). */
1702 /* Anything else is unsupported. */
1706 /* Immutable or append-only files cannot be modified, either. */
1707 if (node->tn_flags & (IMMUTABLE | APPEND))
1710 error = tmpfs_truncate(vp, size);
1711 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents
1712 * for us, as will update tn_status; no need to do that here. */
1714 ASSERT_VOP_ELOCKED(vp, "chsize2");
1720 * Change access and modification times of the given vnode.
1721 * Caller should execute tmpfs_update on vp after a successful execution.
1722 * The vnode must be locked on entry and remain locked on exit.
1725 tmpfs_chtimes(struct vnode *vp, struct vattr *vap,
1726 struct ucred *cred, struct thread *l)
1729 struct tmpfs_node *node;
1731 ASSERT_VOP_ELOCKED(vp, "chtimes");
1733 node = VP_TO_TMPFS_NODE(vp);
1735 /* Disallow this operation if the file system is mounted read-only. */
1736 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1739 /* Immutable or append-only files cannot be modified, either. */
1740 if (node->tn_flags & (IMMUTABLE | APPEND))
1743 error = vn_utimes_perm(vp, vap, cred, l);
1747 if (vap->va_atime.tv_sec != VNOVAL)
1748 node->tn_status |= TMPFS_NODE_ACCESSED;
1750 if (vap->va_mtime.tv_sec != VNOVAL)
1751 node->tn_status |= TMPFS_NODE_MODIFIED;
1753 if (vap->va_birthtime.tv_sec != VNOVAL)
1754 node->tn_status |= TMPFS_NODE_MODIFIED;
1756 tmpfs_itimes(vp, &vap->va_atime, &vap->va_mtime);
1758 if (vap->va_birthtime.tv_sec != VNOVAL)
1759 node->tn_birthtime = vap->va_birthtime;
1760 ASSERT_VOP_ELOCKED(vp, "chtimes2");
1766 tmpfs_set_status(struct tmpfs_node *node, int status)
1769 if ((node->tn_status & status) == status)
1771 TMPFS_NODE_LOCK(node);
1772 node->tn_status |= status;
1773 TMPFS_NODE_UNLOCK(node);
1776 /* Sync timestamps */
1778 tmpfs_itimes(struct vnode *vp, const struct timespec *acc,
1779 const struct timespec *mod)
1781 struct tmpfs_node *node;
1782 struct timespec now;
1784 ASSERT_VOP_LOCKED(vp, "tmpfs_itimes");
1785 node = VP_TO_TMPFS_NODE(vp);
1787 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
1788 TMPFS_NODE_CHANGED)) == 0)
1791 vfs_timestamp(&now);
1792 TMPFS_NODE_LOCK(node);
1793 if (node->tn_status & TMPFS_NODE_ACCESSED) {
1796 node->tn_atime = *acc;
1798 if (node->tn_status & TMPFS_NODE_MODIFIED) {
1801 node->tn_mtime = *mod;
1803 if (node->tn_status & TMPFS_NODE_CHANGED)
1804 node->tn_ctime = now;
1805 node->tn_status &= ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
1806 TMPFS_NODE_CHANGED);
1807 TMPFS_NODE_UNLOCK(node);
1809 /* XXX: FIX? The entropy here is desirable, but the harvesting may be expensive */
1810 random_harvest_queue(node, sizeof(*node), 1, RANDOM_FS_ATIME);
1814 tmpfs_update(struct vnode *vp)
1817 tmpfs_itimes(vp, NULL, NULL);
1821 tmpfs_truncate(struct vnode *vp, off_t length)
1824 struct tmpfs_node *node;
1826 node = VP_TO_TMPFS_NODE(vp);
1833 if (node->tn_size == length) {
1838 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
1841 error = tmpfs_reg_resize(vp, length, FALSE);
1843 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1852 tmpfs_dirtree_cmp(struct tmpfs_dirent *a, struct tmpfs_dirent *b)
1854 if (a->td_hash > b->td_hash)
1856 else if (a->td_hash < b->td_hash)
1861 RB_GENERATE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);