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/rwlock.h>
47 #include <sys/systm.h>
48 #include <sys/sysctl.h>
49 #include <sys/vnode.h>
50 #include <sys/vmmeter.h>
53 #include <vm/vm_param.h>
54 #include <vm/vm_object.h>
55 #include <vm/vm_page.h>
56 #include <vm/vm_pageout.h>
57 #include <vm/vm_pager.h>
58 #include <vm/vm_extern.h>
60 #include <fs/tmpfs/tmpfs.h>
61 #include <fs/tmpfs/tmpfs_fifoops.h>
62 #include <fs/tmpfs/tmpfs_vnops.h>
64 struct tmpfs_dir_cursor {
65 struct tmpfs_dirent *tdc_current;
66 struct tmpfs_dirent *tdc_tree;
69 SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system");
71 static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED;
74 sysctl_mem_reserved(SYSCTL_HANDLER_ARGS)
79 pages = *(long *)arg1;
80 bytes = pages * PAGE_SIZE;
82 error = sysctl_handle_long(oidp, &bytes, 0, req);
83 if (error || !req->newptr)
86 pages = bytes / PAGE_SIZE;
87 if (pages < TMPFS_PAGES_MINRESERVED)
90 *(long *)arg1 = pages;
94 SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, memory_reserved, CTLTYPE_LONG|CTLFLAG_RW,
95 &tmpfs_pages_reserved, 0, sysctl_mem_reserved, "L",
96 "Amount of available memory and swap below which tmpfs growth stops");
98 static __inline int tmpfs_dirtree_cmp(struct tmpfs_dirent *a,
99 struct tmpfs_dirent *b);
100 RB_PROTOTYPE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);
103 tmpfs_mem_avail(void)
107 avail = swap_pager_avail + cnt.v_free_count + cnt.v_cache_count -
108 tmpfs_pages_reserved;
109 if (__predict_false(avail < 0))
115 tmpfs_pages_used(struct tmpfs_mount *tmp)
117 const size_t node_size = sizeof(struct tmpfs_node) +
118 sizeof(struct tmpfs_dirent);
121 meta_pages = howmany((uintmax_t)tmp->tm_nodes_inuse * node_size,
123 return (meta_pages + tmp->tm_pages_used);
127 tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages)
129 if (tmpfs_mem_avail() < req_pages)
132 if (tmp->tm_pages_max != SIZE_MAX &&
133 tmp->tm_pages_max < req_pages + tmpfs_pages_used(tmp))
139 /* --------------------------------------------------------------------- */
142 * Allocates a new node of type 'type' inside the 'tmp' mount point, with
143 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode',
144 * using the credentials of the process 'p'.
146 * If the node type is set to 'VDIR', then the parent parameter must point
147 * to the parent directory of the node being created. It may only be NULL
148 * while allocating the root node.
150 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter
151 * specifies the device the node represents.
153 * If the node type is set to 'VLNK', then the parameter target specifies
154 * the file name of the target file for the symbolic link that is being
157 * Note that new nodes are retrieved from the available list if it has
158 * items or, if it is empty, from the node pool as long as there is enough
159 * space to create them.
161 * Returns zero on success or an appropriate error code on failure.
164 tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type,
165 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent,
166 char *target, dev_t rdev, struct tmpfs_node **node)
168 struct tmpfs_node *nnode;
171 /* If the root directory of the 'tmp' file system is not yet
172 * allocated, this must be the request to do it. */
173 MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR));
175 MPASS(IFF(type == VLNK, target != NULL));
176 MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL));
178 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max)
180 if (tmpfs_pages_check_avail(tmp, 1) == 0)
183 nnode = (struct tmpfs_node *)uma_zalloc_arg(
184 tmp->tm_node_pool, tmp, M_WAITOK);
186 /* Generic initialization. */
187 nnode->tn_type = type;
188 vfs_timestamp(&nnode->tn_atime);
189 nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime =
193 nnode->tn_mode = mode;
194 nnode->tn_id = alloc_unr(tmp->tm_ino_unr);
196 /* Type-specific initialization. */
197 switch (nnode->tn_type) {
200 nnode->tn_rdev = rdev;
204 RB_INIT(&nnode->tn_dir.tn_dirhead);
205 LIST_INIT(&nnode->tn_dir.tn_dupindex);
206 MPASS(parent != nnode);
207 MPASS(IMPLIES(parent == NULL, tmp->tm_root == NULL));
208 nnode->tn_dir.tn_parent = (parent == NULL) ? nnode : parent;
209 nnode->tn_dir.tn_readdir_lastn = 0;
210 nnode->tn_dir.tn_readdir_lastp = NULL;
212 TMPFS_NODE_LOCK(nnode->tn_dir.tn_parent);
213 nnode->tn_dir.tn_parent->tn_links++;
214 TMPFS_NODE_UNLOCK(nnode->tn_dir.tn_parent);
223 MPASS(strlen(target) < MAXPATHLEN);
224 nnode->tn_size = strlen(target);
225 nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME,
227 memcpy(nnode->tn_link, target, nnode->tn_size);
231 obj = nnode->tn_reg.tn_aobj =
232 vm_pager_allocate(OBJT_SWAP, NULL, 0, VM_PROT_DEFAULT, 0,
233 NULL /* XXXKIB - tmpfs needs swap reservation */);
234 VM_OBJECT_WLOCK(obj);
235 /* OBJ_TMPFS is set together with the setting of vp->v_object */
236 vm_object_set_flag(obj, OBJ_NOSPLIT);
237 vm_object_clear_flag(obj, OBJ_ONEMAPPING);
238 VM_OBJECT_WUNLOCK(obj);
242 panic("tmpfs_alloc_node: type %p %d", nnode, (int)nnode->tn_type);
246 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries);
247 tmp->tm_nodes_inuse++;
254 /* --------------------------------------------------------------------- */
257 * Destroys the node pointed to by node from the file system 'tmp'.
258 * If the node does not belong to the given mount point, the results are
261 * If the node references a directory; no entries are allowed because
262 * their removal could need a recursive algorithm, something forbidden in
263 * kernel space. Furthermore, there is not need to provide such
264 * functionality (recursive removal) because the only primitives offered
265 * to the user are the removal of empty directories and the deletion of
268 * Note that nodes are not really deleted; in fact, when a node has been
269 * allocated, it cannot be deleted during the whole life of the file
270 * system. Instead, they are moved to the available list and remain there
274 tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node)
279 TMPFS_NODE_LOCK(node);
280 MPASS(node->tn_vnode == NULL);
281 MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0);
282 TMPFS_NODE_UNLOCK(node);
286 LIST_REMOVE(node, tn_entries);
287 tmp->tm_nodes_inuse--;
290 switch (node->tn_type) {
292 /* Do not do anything. VNON is provided to let the
293 * allocation routine clean itself easily by avoiding
294 * duplicating code in it. */
308 free(node->tn_link, M_TMPFSNAME);
312 uobj = node->tn_reg.tn_aobj;
315 tmp->tm_pages_used -= uobj->size;
317 KASSERT((uobj->flags & OBJ_TMPFS) == 0,
318 ("leaked OBJ_TMPFS node %p vm_obj %p", node, uobj));
319 vm_object_deallocate(uobj);
324 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type);
327 free_unr(tmp->tm_ino_unr, node->tn_id);
328 uma_zfree(tmp->tm_node_pool, node);
331 /* --------------------------------------------------------------------- */
333 static __inline uint32_t
334 tmpfs_dirent_hash(const char *name, u_int len)
338 hash = fnv_32_buf(name, len, FNV1_32_INIT + len) & TMPFS_DIRCOOKIE_MASK;
339 #ifdef TMPFS_DEBUG_DIRCOOKIE_DUP
342 if (hash < TMPFS_DIRCOOKIE_MIN)
343 hash += TMPFS_DIRCOOKIE_MIN;
348 static __inline off_t
349 tmpfs_dirent_cookie(struct tmpfs_dirent *de)
351 MPASS(de->td_cookie >= TMPFS_DIRCOOKIE_MIN);
353 return (de->td_cookie);
356 static __inline boolean_t
357 tmpfs_dirent_dup(struct tmpfs_dirent *de)
359 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUP) != 0);
362 static __inline boolean_t
363 tmpfs_dirent_duphead(struct tmpfs_dirent *de)
365 return ((de->td_cookie & TMPFS_DIRCOOKIE_DUPHEAD) != 0);
369 tmpfs_dirent_init(struct tmpfs_dirent *de, const char *name, u_int namelen)
371 de->td_hash = de->td_cookie = tmpfs_dirent_hash(name, namelen);
372 memcpy(de->ud.td_name, name, namelen);
373 de->td_namelen = namelen;
377 * Allocates a new directory entry for the node node with a name of name.
378 * The new directory entry is returned in *de.
380 * The link count of node is increased by one to reflect the new object
383 * Returns zero on success or an appropriate error code on failure.
386 tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node,
387 const char *name, u_int len, struct tmpfs_dirent **de)
389 struct tmpfs_dirent *nde;
391 nde = uma_zalloc(tmp->tm_dirent_pool, M_WAITOK);
394 nde->ud.td_name = malloc(len, M_TMPFSNAME, M_WAITOK);
395 tmpfs_dirent_init(nde, name, len);
406 /* --------------------------------------------------------------------- */
409 * Frees a directory entry. It is the caller's responsibility to destroy
410 * the node referenced by it if needed.
412 * The link count of node is decreased by one to reflect the removal of an
413 * object that referenced it. This only happens if 'node_exists' is true;
414 * otherwise the function will not access the node referred to by the
415 * directory entry, as it may already have been released from the outside.
418 tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de)
420 struct tmpfs_node *node;
424 MPASS(node->tn_links > 0);
427 if (!tmpfs_dirent_duphead(de) && de->ud.td_name != NULL)
428 free(de->ud.td_name, M_TMPFSNAME);
429 uma_zfree(tmp->tm_dirent_pool, de);
432 /* --------------------------------------------------------------------- */
435 tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj)
438 if (vp->v_type != VREG || obj == NULL)
441 VM_OBJECT_WLOCK(obj);
443 vm_object_clear_flag(obj, OBJ_TMPFS);
444 obj->un_pager.swp.swp_tmpfs = NULL;
446 VM_OBJECT_WUNLOCK(obj);
450 * Need to clear v_object for insmntque failure.
453 tmpfs_insmntque_dtr(struct vnode *vp, void *dtr_arg)
456 tmpfs_destroy_vobject(vp, vp->v_object);
459 vp->v_op = &dead_vnodeops;
465 * Allocates a new vnode for the node node or returns a new reference to
466 * an existing one if the node had already a vnode referencing it. The
467 * resulting locked vnode is returned in *vpp.
469 * Returns zero on success or an appropriate error code on failure.
472 tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag,
481 TMPFS_NODE_LOCK(node);
483 if ((vp = node->tn_vnode) != NULL) {
484 MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0);
486 if ((node->tn_type == VDIR && node->tn_dir.tn_parent == NULL) ||
487 ((vp->v_iflag & VI_DOOMED) != 0 &&
488 (lkflag & LK_NOWAIT) != 0)) {
490 TMPFS_NODE_UNLOCK(node);
495 if ((vp->v_iflag & VI_DOOMED) != 0) {
497 node->tn_vpstate |= TMPFS_VNODE_WRECLAIM;
498 while ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) {
499 msleep(&node->tn_vnode, TMPFS_NODE_MTX(node),
504 TMPFS_NODE_UNLOCK(node);
505 error = vget(vp, lkflag | LK_INTERLOCK, curthread);
514 * Make sure the vnode is still there after
515 * getting the interlock to avoid racing a free.
517 if (node->tn_vnode == NULL || node->tn_vnode != vp) {
525 if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) ||
526 (node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) {
527 TMPFS_NODE_UNLOCK(node);
534 * otherwise lock the vp list while we call getnewvnode
535 * since that can block.
537 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) {
538 node->tn_vpstate |= TMPFS_VNODE_WANT;
539 error = msleep((caddr_t) &node->tn_vpstate,
540 TMPFS_NODE_MTX(node), PDROP | PCATCH,
541 "tmpfs_alloc_vp", 0);
547 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING;
549 TMPFS_NODE_UNLOCK(node);
551 /* Get a new vnode and associate it with our node. */
552 error = getnewvnode("tmpfs", mp, &tmpfs_vnodeop_entries, &vp);
557 (void) vn_lock(vp, lkflag | LK_RETRY);
560 vp->v_type = node->tn_type;
562 /* Type-specific initialization. */
563 switch (node->tn_type) {
573 vp->v_op = &tmpfs_fifoop_entries;
576 object = node->tn_reg.tn_aobj;
577 VM_OBJECT_WLOCK(object);
579 KASSERT(vp->v_object == NULL, ("Not NULL v_object in tmpfs"));
580 vp->v_object = object;
581 object->un_pager.swp.swp_tmpfs = vp;
582 vm_object_set_flag(object, OBJ_TMPFS);
584 VM_OBJECT_WUNLOCK(object);
587 MPASS(node->tn_dir.tn_parent != NULL);
588 if (node->tn_dir.tn_parent == node)
589 vp->v_vflag |= VV_ROOT;
593 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type);
596 error = insmntque1(vp, mp, tmpfs_insmntque_dtr, NULL);
601 TMPFS_NODE_LOCK(node);
603 MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING);
604 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING;
607 if (node->tn_vpstate & TMPFS_VNODE_WANT) {
608 node->tn_vpstate &= ~TMPFS_VNODE_WANT;
609 TMPFS_NODE_UNLOCK(node);
610 wakeup((caddr_t) &node->tn_vpstate);
612 TMPFS_NODE_UNLOCK(node);
619 MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp));
620 TMPFS_NODE_LOCK(node);
621 MPASS(*vpp == node->tn_vnode);
622 TMPFS_NODE_UNLOCK(node);
629 /* --------------------------------------------------------------------- */
632 * Destroys the association between the vnode vp and the node it
636 tmpfs_free_vp(struct vnode *vp)
638 struct tmpfs_node *node;
640 node = VP_TO_TMPFS_NODE(vp);
642 mtx_assert(TMPFS_NODE_MTX(node), MA_OWNED);
643 node->tn_vnode = NULL;
644 if ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0)
645 wakeup(&node->tn_vnode);
646 node->tn_vpstate &= ~TMPFS_VNODE_WRECLAIM;
650 /* --------------------------------------------------------------------- */
653 * Allocates a new file of type 'type' and adds it to the parent directory
654 * 'dvp'; this addition is done using the component name given in 'cnp'.
655 * The ownership of the new file is automatically assigned based on the
656 * credentials of the caller (through 'cnp'), the group is set based on
657 * the parent directory and the mode is determined from the 'vap' argument.
658 * If successful, *vpp holds a vnode to the newly created file and zero
659 * is returned. Otherwise *vpp is NULL and the function returns an
660 * appropriate error code.
663 tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap,
664 struct componentname *cnp, char *target)
667 struct tmpfs_dirent *de;
668 struct tmpfs_mount *tmp;
669 struct tmpfs_node *dnode;
670 struct tmpfs_node *node;
671 struct tmpfs_node *parent;
673 MPASS(VOP_ISLOCKED(dvp));
674 MPASS(cnp->cn_flags & HASBUF);
676 tmp = VFS_TO_TMPFS(dvp->v_mount);
677 dnode = VP_TO_TMPFS_DIR(dvp);
680 /* If the entry we are creating is a directory, we cannot overflow
681 * the number of links of its parent, because it will get a new
683 if (vap->va_type == VDIR) {
684 /* Ensure that we do not overflow the maximum number of links
685 * imposed by the system. */
686 MPASS(dnode->tn_links <= LINK_MAX);
687 if (dnode->tn_links == LINK_MAX) {
693 MPASS(parent != NULL);
697 /* Allocate a node that represents the new file. */
698 error = tmpfs_alloc_node(tmp, vap->va_type, cnp->cn_cred->cr_uid,
699 dnode->tn_gid, vap->va_mode, parent, target, vap->va_rdev, &node);
703 /* Allocate a directory entry that points to the new file. */
704 error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen,
707 tmpfs_free_node(tmp, node);
711 /* Allocate a vnode for the new file. */
712 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp);
714 tmpfs_free_dirent(tmp, de);
715 tmpfs_free_node(tmp, node);
719 /* Now that all required items are allocated, we can proceed to
720 * insert the new node into the directory, an operation that
722 if (cnp->cn_flags & ISWHITEOUT)
723 tmpfs_dir_whiteout_remove(dvp, cnp);
724 tmpfs_dir_attach(dvp, de);
731 /* --------------------------------------------------------------------- */
733 static struct tmpfs_dirent *
734 tmpfs_dir_first(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
736 struct tmpfs_dirent *de;
738 de = RB_MIN(tmpfs_dir, &dnode->tn_dir.tn_dirhead);
740 if (de != NULL && tmpfs_dirent_duphead(de))
741 de = LIST_FIRST(&de->ud.td_duphead);
742 dc->tdc_current = de;
744 return (dc->tdc_current);
747 static struct tmpfs_dirent *
748 tmpfs_dir_next(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
750 struct tmpfs_dirent *de;
752 MPASS(dc->tdc_tree != NULL);
753 if (tmpfs_dirent_dup(dc->tdc_current)) {
754 dc->tdc_current = LIST_NEXT(dc->tdc_current, uh.td_dup.entries);
755 if (dc->tdc_current != NULL)
756 return (dc->tdc_current);
758 dc->tdc_tree = dc->tdc_current = RB_NEXT(tmpfs_dir,
759 &dnode->tn_dir.tn_dirhead, dc->tdc_tree);
760 if ((de = dc->tdc_current) != NULL && tmpfs_dirent_duphead(de)) {
761 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
762 MPASS(dc->tdc_current != NULL);
765 return (dc->tdc_current);
768 /* Lookup directory entry in RB-Tree. Function may return duphead entry. */
769 static struct tmpfs_dirent *
770 tmpfs_dir_xlookup_hash(struct tmpfs_node *dnode, uint32_t hash)
772 struct tmpfs_dirent *de, dekey;
774 dekey.td_hash = hash;
775 de = RB_FIND(tmpfs_dir, &dnode->tn_dir.tn_dirhead, &dekey);
779 /* Lookup directory entry by cookie, initialize directory cursor accordingly. */
780 static struct tmpfs_dirent *
781 tmpfs_dir_lookup_cookie(struct tmpfs_node *node, off_t cookie,
782 struct tmpfs_dir_cursor *dc)
784 struct tmpfs_dir *dirhead = &node->tn_dir.tn_dirhead;
785 struct tmpfs_dirent *de, dekey;
787 MPASS(cookie >= TMPFS_DIRCOOKIE_MIN);
789 if (cookie == node->tn_dir.tn_readdir_lastn &&
790 (de = node->tn_dir.tn_readdir_lastp) != NULL) {
791 /* Protect against possible race, tn_readdir_last[pn]
792 * may be updated with only shared vnode lock held. */
793 if (cookie == tmpfs_dirent_cookie(de))
797 if ((cookie & TMPFS_DIRCOOKIE_DUP) != 0) {
798 LIST_FOREACH(de, &node->tn_dir.tn_dupindex,
799 uh.td_dup.index_entries) {
800 MPASS(tmpfs_dirent_dup(de));
801 if (de->td_cookie == cookie)
803 /* dupindex list is sorted. */
804 if (de->td_cookie < cookie) {
813 MPASS((cookie & TMPFS_DIRCOOKIE_MASK) == cookie);
814 dekey.td_hash = cookie;
815 /* Recover if direntry for cookie was removed */
816 de = RB_NFIND(tmpfs_dir, dirhead, &dekey);
818 dc->tdc_current = de;
819 if (de != NULL && tmpfs_dirent_duphead(de)) {
820 dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
821 MPASS(dc->tdc_current != NULL);
823 return (dc->tdc_current);
827 dc->tdc_current = de;
828 if (de != NULL && tmpfs_dirent_dup(de))
829 dc->tdc_tree = tmpfs_dir_xlookup_hash(node,
831 return (dc->tdc_current);
835 * Looks for a directory entry in the directory represented by node.
836 * 'cnp' describes the name of the entry to look for. Note that the .
837 * and .. components are not allowed as they do not physically exist
838 * within directories.
840 * Returns a pointer to the entry when found, otherwise NULL.
842 struct tmpfs_dirent *
843 tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f,
844 struct componentname *cnp)
846 struct tmpfs_dir_duphead *duphead;
847 struct tmpfs_dirent *de;
850 MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.'));
851 MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' &&
852 cnp->cn_nameptr[1] == '.')));
853 TMPFS_VALIDATE_DIR(node);
855 hash = tmpfs_dirent_hash(cnp->cn_nameptr, cnp->cn_namelen);
856 de = tmpfs_dir_xlookup_hash(node, hash);
857 if (de != NULL && tmpfs_dirent_duphead(de)) {
858 duphead = &de->ud.td_duphead;
859 LIST_FOREACH(de, duphead, uh.td_dup.entries) {
860 if (TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
864 } else if (de != NULL) {
865 if (!TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
869 if (de != NULL && f != NULL && de->td_node != f)
876 * Attach duplicate-cookie directory entry nde to dnode and insert to dupindex
877 * list, allocate new cookie value.
880 tmpfs_dir_attach_dup(struct tmpfs_node *dnode,
881 struct tmpfs_dir_duphead *duphead, struct tmpfs_dirent *nde)
883 struct tmpfs_dir_duphead *dupindex;
884 struct tmpfs_dirent *de, *pde;
886 dupindex = &dnode->tn_dir.tn_dupindex;
887 de = LIST_FIRST(dupindex);
888 if (de == NULL || de->td_cookie < TMPFS_DIRCOOKIE_DUP_MAX) {
890 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
892 nde->td_cookie = de->td_cookie + 1;
893 MPASS(tmpfs_dirent_dup(nde));
894 LIST_INSERT_HEAD(dupindex, nde, uh.td_dup.index_entries);
895 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
900 * Cookie numbers are near exhaustion. Scan dupindex list for unused
901 * numbers. dupindex list is sorted in descending order. Keep it so
902 * after inserting nde.
906 de = LIST_NEXT(de, uh.td_dup.index_entries);
907 if (de == NULL && pde->td_cookie != TMPFS_DIRCOOKIE_DUP_MIN) {
909 * Last element of the index doesn't have minimal cookie
912 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
913 LIST_INSERT_AFTER(pde, nde, uh.td_dup.index_entries);
914 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
916 } else if (de == NULL) {
918 * We are so lucky have 2^30 hash duplicates in single
919 * directory :) Return largest possible cookie value.
920 * It should be fine except possible issues with
921 * VOP_READDIR restart.
923 nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MAX;
924 LIST_INSERT_HEAD(dupindex, nde,
925 uh.td_dup.index_entries);
926 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
929 if (de->td_cookie + 1 == pde->td_cookie ||
930 de->td_cookie >= TMPFS_DIRCOOKIE_DUP_MAX)
931 continue; /* No hole or invalid cookie. */
932 nde->td_cookie = de->td_cookie + 1;
933 MPASS(tmpfs_dirent_dup(nde));
934 MPASS(pde->td_cookie > nde->td_cookie);
935 MPASS(nde->td_cookie > de->td_cookie);
936 LIST_INSERT_BEFORE(de, nde, uh.td_dup.index_entries);
937 LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
943 * Attaches the directory entry de to the directory represented by vp.
944 * Note that this does not change the link count of the node pointed by
945 * the directory entry, as this is done by tmpfs_alloc_dirent.
948 tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de)
950 struct tmpfs_node *dnode;
951 struct tmpfs_dirent *xde, *nde;
953 ASSERT_VOP_ELOCKED(vp, __func__);
954 MPASS(de->td_namelen > 0);
955 MPASS(de->td_hash >= TMPFS_DIRCOOKIE_MIN);
956 MPASS(de->td_cookie == de->td_hash);
958 dnode = VP_TO_TMPFS_DIR(vp);
959 dnode->tn_dir.tn_readdir_lastn = 0;
960 dnode->tn_dir.tn_readdir_lastp = NULL;
962 MPASS(!tmpfs_dirent_dup(de));
963 xde = RB_INSERT(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
964 if (xde != NULL && tmpfs_dirent_duphead(xde))
965 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
966 else if (xde != NULL) {
968 * Allocate new duphead. Swap xde with duphead to avoid
969 * adding/removing elements with the same hash.
971 MPASS(!tmpfs_dirent_dup(xde));
972 tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), NULL, NULL, 0,
974 /* *nde = *xde; XXX gcc 4.2.1 may generate invalid code. */
975 memcpy(nde, xde, sizeof(*xde));
976 xde->td_cookie |= TMPFS_DIRCOOKIE_DUPHEAD;
977 LIST_INIT(&xde->ud.td_duphead);
980 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, nde);
981 tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
983 dnode->tn_size += sizeof(struct tmpfs_dirent);
984 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
988 /* --------------------------------------------------------------------- */
991 * Detaches the directory entry de from the directory represented by vp.
992 * Note that this does not change the link count of the node pointed by
993 * the directory entry, as this is done by tmpfs_free_dirent.
996 tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de)
998 struct tmpfs_mount *tmp;
999 struct tmpfs_dir *head;
1000 struct tmpfs_node *dnode;
1001 struct tmpfs_dirent *xde;
1003 ASSERT_VOP_ELOCKED(vp, __func__);
1005 dnode = VP_TO_TMPFS_DIR(vp);
1006 head = &dnode->tn_dir.tn_dirhead;
1007 dnode->tn_dir.tn_readdir_lastn = 0;
1008 dnode->tn_dir.tn_readdir_lastp = NULL;
1010 if (tmpfs_dirent_dup(de)) {
1011 /* Remove duphead if de was last entry. */
1012 if (LIST_NEXT(de, uh.td_dup.entries) == NULL) {
1013 xde = tmpfs_dir_xlookup_hash(dnode, de->td_hash);
1014 MPASS(tmpfs_dirent_duphead(xde));
1017 LIST_REMOVE(de, uh.td_dup.entries);
1018 LIST_REMOVE(de, uh.td_dup.index_entries);
1020 if (LIST_EMPTY(&xde->ud.td_duphead)) {
1021 RB_REMOVE(tmpfs_dir, head, xde);
1022 tmp = VFS_TO_TMPFS(vp->v_mount);
1023 MPASS(xde->td_node == NULL);
1024 tmpfs_free_dirent(tmp, xde);
1028 RB_REMOVE(tmpfs_dir, head, de);
1030 dnode->tn_size -= sizeof(struct tmpfs_dirent);
1031 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1032 TMPFS_NODE_MODIFIED;
1036 tmpfs_dir_destroy(struct tmpfs_mount *tmp, struct tmpfs_node *dnode)
1038 struct tmpfs_dirent *de, *dde, *nde;
1040 RB_FOREACH_SAFE(de, tmpfs_dir, &dnode->tn_dir.tn_dirhead, nde) {
1041 RB_REMOVE(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
1042 /* Node may already be destroyed. */
1044 if (tmpfs_dirent_duphead(de)) {
1045 while ((dde = LIST_FIRST(&de->ud.td_duphead)) != NULL) {
1046 LIST_REMOVE(dde, uh.td_dup.entries);
1047 dde->td_node = NULL;
1048 tmpfs_free_dirent(tmp, dde);
1051 tmpfs_free_dirent(tmp, de);
1055 /* --------------------------------------------------------------------- */
1058 * Helper function for tmpfs_readdir. Creates a '.' entry for the given
1059 * directory and returns it in the uio space. The function returns 0
1060 * on success, -1 if there was not enough space in the uio structure to
1061 * hold the directory entry or an appropriate error code if another
1065 tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio)
1070 TMPFS_VALIDATE_DIR(node);
1071 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT);
1073 dent.d_fileno = node->tn_id;
1074 dent.d_type = DT_DIR;
1076 dent.d_name[0] = '.';
1077 dent.d_name[1] = '\0';
1078 dent.d_reclen = GENERIC_DIRSIZ(&dent);
1080 if (dent.d_reclen > uio->uio_resid)
1081 error = EJUSTRETURN;
1083 error = uiomove(&dent, dent.d_reclen, uio);
1085 node->tn_status |= TMPFS_NODE_ACCESSED;
1090 /* --------------------------------------------------------------------- */
1093 * Helper function for tmpfs_readdir. Creates a '..' entry for the given
1094 * directory and returns it in the uio space. The function returns 0
1095 * on success, -1 if there was not enough space in the uio structure to
1096 * hold the directory entry or an appropriate error code if another
1100 tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio)
1105 TMPFS_VALIDATE_DIR(node);
1106 MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT);
1109 * Return ENOENT if the current node is already removed.
1111 TMPFS_ASSERT_LOCKED(node);
1112 if (node->tn_dir.tn_parent == NULL) {
1116 TMPFS_NODE_LOCK(node->tn_dir.tn_parent);
1117 dent.d_fileno = node->tn_dir.tn_parent->tn_id;
1118 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent);
1120 dent.d_type = DT_DIR;
1122 dent.d_name[0] = '.';
1123 dent.d_name[1] = '.';
1124 dent.d_name[2] = '\0';
1125 dent.d_reclen = GENERIC_DIRSIZ(&dent);
1127 if (dent.d_reclen > uio->uio_resid)
1128 error = EJUSTRETURN;
1130 error = uiomove(&dent, dent.d_reclen, uio);
1132 node->tn_status |= TMPFS_NODE_ACCESSED;
1137 /* --------------------------------------------------------------------- */
1140 * Helper function for tmpfs_readdir. Returns as much directory entries
1141 * as can fit in the uio space. The read starts at uio->uio_offset.
1142 * The function returns 0 on success, -1 if there was not enough space
1143 * in the uio structure to hold the directory entry or an appropriate
1144 * error code if another error happens.
1147 tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, int cnt,
1148 u_long *cookies, int *ncookies)
1150 struct tmpfs_dir_cursor dc;
1151 struct tmpfs_dirent *de;
1155 TMPFS_VALIDATE_DIR(node);
1158 switch (uio->uio_offset) {
1159 case TMPFS_DIRCOOKIE_DOT:
1160 error = tmpfs_dir_getdotdent(node, uio);
1163 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT;
1165 cookies[(*ncookies)++] = off = uio->uio_offset;
1166 case TMPFS_DIRCOOKIE_DOTDOT:
1167 error = tmpfs_dir_getdotdotdent(node, uio);
1170 de = tmpfs_dir_first(node, &dc);
1172 uio->uio_offset = TMPFS_DIRCOOKIE_EOF;
1174 uio->uio_offset = tmpfs_dirent_cookie(de);
1176 cookies[(*ncookies)++] = off = uio->uio_offset;
1180 case TMPFS_DIRCOOKIE_EOF:
1183 de = tmpfs_dir_lookup_cookie(node, uio->uio_offset, &dc);
1187 off = tmpfs_dirent_cookie(de);
1190 /* Read as much entries as possible; i.e., until we reach the end of
1191 * the directory or we exhaust uio space. */
1195 /* Create a dirent structure representing the current
1196 * tmpfs_node and fill it. */
1197 if (de->td_node == NULL) {
1201 d.d_fileno = de->td_node->tn_id;
1202 switch (de->td_node->tn_type) {
1232 panic("tmpfs_dir_getdents: type %p %d",
1233 de->td_node, (int)de->td_node->tn_type);
1236 d.d_namlen = de->td_namelen;
1237 MPASS(de->td_namelen < sizeof(d.d_name));
1238 (void)memcpy(d.d_name, de->ud.td_name, de->td_namelen);
1239 d.d_name[de->td_namelen] = '\0';
1240 d.d_reclen = GENERIC_DIRSIZ(&d);
1242 /* Stop reading if the directory entry we are treating is
1243 * bigger than the amount of data that can be returned. */
1244 if (d.d_reclen > uio->uio_resid) {
1245 error = EJUSTRETURN;
1249 /* Copy the new dirent structure into the output buffer and
1250 * advance pointers. */
1251 error = uiomove(&d, d.d_reclen, uio);
1253 de = tmpfs_dir_next(node, &dc);
1256 off = TMPFS_DIRCOOKIE_EOF;
1258 off = tmpfs_dirent_cookie(de);
1259 MPASS(*ncookies < cnt);
1260 cookies[(*ncookies)++] = off;
1263 } while (error == 0 && uio->uio_resid > 0 && de != NULL);
1265 /* Update the offset and cache. */
1268 off = TMPFS_DIRCOOKIE_EOF;
1270 off = tmpfs_dirent_cookie(de);
1273 uio->uio_offset = off;
1274 node->tn_dir.tn_readdir_lastn = off;
1275 node->tn_dir.tn_readdir_lastp = de;
1277 node->tn_status |= TMPFS_NODE_ACCESSED;
1282 tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp)
1284 struct tmpfs_dirent *de;
1287 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL,
1288 cnp->cn_nameptr, cnp->cn_namelen, &de);
1291 tmpfs_dir_attach(dvp, de);
1296 tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp)
1298 struct tmpfs_dirent *de;
1300 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1301 MPASS(de != NULL && de->td_node == NULL);
1302 tmpfs_dir_detach(dvp, de);
1303 tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de);
1306 /* --------------------------------------------------------------------- */
1309 * Resizes the aobj associated with the regular file pointed to by 'vp' to the
1310 * size 'newsize'. 'vp' must point to a vnode that represents a regular file.
1311 * 'newsize' must be positive.
1313 * Returns zero on success or an appropriate error code on failure.
1316 tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr)
1318 struct tmpfs_mount *tmp;
1319 struct tmpfs_node *node;
1322 vm_pindex_t idx, newpages, oldpages;
1326 MPASS(vp->v_type == VREG);
1327 MPASS(newsize >= 0);
1329 node = VP_TO_TMPFS_NODE(vp);
1330 uobj = node->tn_reg.tn_aobj;
1331 tmp = VFS_TO_TMPFS(vp->v_mount);
1334 * Convert the old and new sizes to the number of pages needed to
1335 * store them. It may happen that we do not need to do anything
1336 * because the last allocated page can accommodate the change on
1339 oldsize = node->tn_size;
1340 oldpages = OFF_TO_IDX(oldsize + PAGE_MASK);
1341 MPASS(oldpages == uobj->size);
1342 newpages = OFF_TO_IDX(newsize + PAGE_MASK);
1343 if (newpages > oldpages &&
1344 tmpfs_pages_check_avail(tmp, newpages - oldpages) == 0)
1347 VM_OBJECT_WLOCK(uobj);
1348 if (newsize < oldsize) {
1350 * Zero the truncated part of the last page.
1352 base = newsize & PAGE_MASK;
1354 idx = OFF_TO_IDX(newsize);
1356 m = vm_page_lookup(uobj, idx);
1358 if (vm_page_sleep_if_busy(m, "tmfssz"))
1360 MPASS(m->valid == VM_PAGE_BITS_ALL);
1361 } else if (vm_pager_has_page(uobj, idx, NULL, NULL)) {
1362 m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL);
1364 VM_OBJECT_WUNLOCK(uobj);
1366 VM_OBJECT_WLOCK(uobj);
1368 } else if (m->valid != VM_PAGE_BITS_ALL) {
1370 rv = vm_pager_get_pages(uobj, ma, 1, 0);
1371 m = vm_page_lookup(uobj, idx);
1373 /* A cached page was reactivated. */
1376 if (rv == VM_PAGER_OK) {
1377 vm_page_deactivate(m);
1386 VM_OBJECT_WUNLOCK(uobj);
1392 pmap_zero_page_area(m, base, PAGE_SIZE - base);
1394 vm_pager_page_unswapped(m);
1399 * Release any swap space and free any whole pages.
1401 if (newpages < oldpages) {
1402 swap_pager_freespace(uobj, newpages, oldpages -
1404 vm_object_page_remove(uobj, newpages, 0, 0);
1407 uobj->size = newpages;
1408 VM_OBJECT_WUNLOCK(uobj);
1411 tmp->tm_pages_used += (newpages - oldpages);
1414 node->tn_size = newsize;
1418 /* --------------------------------------------------------------------- */
1421 * Change flags of the given vnode.
1422 * Caller should execute tmpfs_update on vp after a successful execution.
1423 * The vnode must be locked on entry and remain locked on exit.
1426 tmpfs_chflags(struct vnode *vp, u_long flags, struct ucred *cred,
1430 struct tmpfs_node *node;
1432 MPASS(VOP_ISLOCKED(vp));
1434 node = VP_TO_TMPFS_NODE(vp);
1436 if ((flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE | SF_NOUNLINK |
1437 UF_APPEND | UF_ARCHIVE | UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP |
1438 UF_NOUNLINK | UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
1439 UF_SPARSE | UF_SYSTEM)) != 0)
1440 return (EOPNOTSUPP);
1442 /* Disallow this operation if the file system is mounted read-only. */
1443 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1447 * Callers may only modify the file flags on objects they
1448 * have VADMIN rights for.
1450 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1453 * Unprivileged processes are not permitted to unset system
1454 * flags, or modify flags if any system flags are set.
1456 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
1457 if (node->tn_flags &
1458 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
1459 error = securelevel_gt(cred, 0);
1464 if (node->tn_flags &
1465 (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
1466 ((flags ^ node->tn_flags) & SF_SETTABLE))
1469 node->tn_flags = flags;
1470 node->tn_status |= TMPFS_NODE_CHANGED;
1472 MPASS(VOP_ISLOCKED(vp));
1477 /* --------------------------------------------------------------------- */
1480 * Change access mode on the given vnode.
1481 * Caller should execute tmpfs_update on vp after a successful execution.
1482 * The vnode must be locked on entry and remain locked on exit.
1485 tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p)
1488 struct tmpfs_node *node;
1490 MPASS(VOP_ISLOCKED(vp));
1492 node = VP_TO_TMPFS_NODE(vp);
1494 /* Disallow this operation if the file system is mounted read-only. */
1495 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1498 /* Immutable or append-only files cannot be modified, either. */
1499 if (node->tn_flags & (IMMUTABLE | APPEND))
1503 * To modify the permissions on a file, must possess VADMIN
1506 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1510 * Privileged processes may set the sticky bit on non-directories,
1511 * as well as set the setgid bit on a file with a group that the
1512 * process is not a member of.
1514 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
1515 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
1518 if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) {
1519 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
1525 node->tn_mode &= ~ALLPERMS;
1526 node->tn_mode |= mode & ALLPERMS;
1528 node->tn_status |= TMPFS_NODE_CHANGED;
1530 MPASS(VOP_ISLOCKED(vp));
1535 /* --------------------------------------------------------------------- */
1538 * Change ownership of the given vnode. At least one of uid or gid must
1539 * be different than VNOVAL. If one is set to that value, the attribute
1541 * Caller should execute tmpfs_update on vp after a successful execution.
1542 * The vnode must be locked on entry and remain locked on exit.
1545 tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
1549 struct tmpfs_node *node;
1553 MPASS(VOP_ISLOCKED(vp));
1555 node = VP_TO_TMPFS_NODE(vp);
1557 /* Assign default values if they are unknown. */
1558 MPASS(uid != VNOVAL || gid != VNOVAL);
1563 MPASS(uid != VNOVAL && gid != VNOVAL);
1565 /* Disallow this operation if the file system is mounted read-only. */
1566 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1569 /* Immutable or append-only files cannot be modified, either. */
1570 if (node->tn_flags & (IMMUTABLE | APPEND))
1574 * To modify the ownership of a file, must possess VADMIN for that
1577 if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
1581 * To change the owner of a file, or change the group of a file to a
1582 * group of which we are not a member, the caller must have
1585 if ((uid != node->tn_uid ||
1586 (gid != node->tn_gid && !groupmember(gid, cred))) &&
1587 (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
1590 ogid = node->tn_gid;
1591 ouid = node->tn_uid;
1596 node->tn_status |= TMPFS_NODE_CHANGED;
1598 if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) {
1599 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0))
1600 node->tn_mode &= ~(S_ISUID | S_ISGID);
1603 MPASS(VOP_ISLOCKED(vp));
1608 /* --------------------------------------------------------------------- */
1611 * Change size of the given vnode.
1612 * Caller should execute tmpfs_update on vp after a successful execution.
1613 * The vnode must be locked on entry and remain locked on exit.
1616 tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred,
1620 struct tmpfs_node *node;
1622 MPASS(VOP_ISLOCKED(vp));
1624 node = VP_TO_TMPFS_NODE(vp);
1626 /* Decide whether this is a valid operation based on the file type. */
1628 switch (vp->v_type) {
1633 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1642 /* Allow modifications of special files even if in the file
1643 * system is mounted read-only (we are not modifying the
1644 * files themselves, but the objects they represent). */
1648 /* Anything else is unsupported. */
1652 /* Immutable or append-only files cannot be modified, either. */
1653 if (node->tn_flags & (IMMUTABLE | APPEND))
1656 error = tmpfs_truncate(vp, size);
1657 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents
1658 * for us, as will update tn_status; no need to do that here. */
1660 MPASS(VOP_ISLOCKED(vp));
1665 /* --------------------------------------------------------------------- */
1668 * Change access and modification times of the given vnode.
1669 * Caller should execute tmpfs_update on vp after a successful execution.
1670 * The vnode must be locked on entry and remain locked on exit.
1673 tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime,
1674 struct timespec *birthtime, int vaflags, struct ucred *cred, struct thread *l)
1677 struct tmpfs_node *node;
1679 MPASS(VOP_ISLOCKED(vp));
1681 node = VP_TO_TMPFS_NODE(vp);
1683 /* Disallow this operation if the file system is mounted read-only. */
1684 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1687 /* Immutable or append-only files cannot be modified, either. */
1688 if (node->tn_flags & (IMMUTABLE | APPEND))
1691 /* Determine if the user have proper privilege to update time. */
1692 if (vaflags & VA_UTIMES_NULL) {
1693 error = VOP_ACCESS(vp, VADMIN, cred, l);
1695 error = VOP_ACCESS(vp, VWRITE, cred, l);
1697 error = VOP_ACCESS(vp, VADMIN, cred, l);
1701 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL)
1702 node->tn_status |= TMPFS_NODE_ACCESSED;
1704 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL)
1705 node->tn_status |= TMPFS_NODE_MODIFIED;
1707 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL)
1708 node->tn_status |= TMPFS_NODE_MODIFIED;
1710 tmpfs_itimes(vp, atime, mtime);
1712 if (birthtime->tv_nsec != VNOVAL && birthtime->tv_nsec != VNOVAL)
1713 node->tn_birthtime = *birthtime;
1714 MPASS(VOP_ISLOCKED(vp));
1719 /* --------------------------------------------------------------------- */
1720 /* Sync timestamps */
1722 tmpfs_itimes(struct vnode *vp, const struct timespec *acc,
1723 const struct timespec *mod)
1725 struct tmpfs_node *node;
1726 struct timespec now;
1728 node = VP_TO_TMPFS_NODE(vp);
1730 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
1731 TMPFS_NODE_CHANGED)) == 0)
1734 vfs_timestamp(&now);
1735 if (node->tn_status & TMPFS_NODE_ACCESSED) {
1738 node->tn_atime = *acc;
1740 if (node->tn_status & TMPFS_NODE_MODIFIED) {
1743 node->tn_mtime = *mod;
1745 if (node->tn_status & TMPFS_NODE_CHANGED) {
1746 node->tn_ctime = now;
1749 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED);
1752 /* --------------------------------------------------------------------- */
1755 tmpfs_update(struct vnode *vp)
1758 tmpfs_itimes(vp, NULL, NULL);
1761 /* --------------------------------------------------------------------- */
1764 tmpfs_truncate(struct vnode *vp, off_t length)
1767 struct tmpfs_node *node;
1769 node = VP_TO_TMPFS_NODE(vp);
1776 if (node->tn_size == length) {
1781 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
1784 error = tmpfs_reg_resize(vp, length, FALSE);
1786 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1796 tmpfs_dirtree_cmp(struct tmpfs_dirent *a, struct tmpfs_dirent *b)
1798 if (a->td_hash > b->td_hash)
1800 else if (a->td_hash < b->td_hash)
1805 RB_GENERATE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);