1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */
4 * Copyright (c) 2005, 2006 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 * tmpfs vnode interface.
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/fcntl.h>
41 #include <sys/lockf.h>
43 #include <sys/namei.h>
46 #include <sys/rwlock.h>
47 #include <sys/sched.h>
49 #include <sys/systm.h>
50 #include <sys/sysctl.h>
51 #include <sys/unistd.h>
52 #include <sys/vnode.h>
55 #include <vm/vm_param.h>
56 #include <vm/vm_object.h>
57 #include <vm/vm_page.h>
58 #include <vm/vm_pager.h>
60 #include <fs/tmpfs/tmpfs_vnops.h>
61 #include <fs/tmpfs/tmpfs.h>
63 SYSCTL_DECL(_vfs_tmpfs);
65 static volatile int tmpfs_rename_restarts;
66 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
67 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
68 "Times rename had to restart due to lock contention");
71 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags,
75 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp));
79 tmpfs_lookup(struct vop_cachedlookup_args *v)
81 struct vnode *dvp = v->a_dvp;
82 struct vnode **vpp = v->a_vpp;
83 struct componentname *cnp = v->a_cnp;
84 struct tmpfs_dirent *de;
85 struct tmpfs_node *dnode;
88 dnode = VP_TO_TMPFS_DIR(dvp);
91 /* Check accessibility of requested node as a first step. */
92 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
96 /* We cannot be requesting the parent directory of the root node. */
97 MPASS(IMPLIES(dnode->tn_type == VDIR &&
98 dnode->tn_dir.tn_parent == dnode,
99 !(cnp->cn_flags & ISDOTDOT)));
101 TMPFS_ASSERT_LOCKED(dnode);
102 if (dnode->tn_dir.tn_parent == NULL) {
106 if (cnp->cn_flags & ISDOTDOT) {
107 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc,
108 dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp);
111 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
116 de = tmpfs_dir_lookup(dnode, NULL, cnp);
117 if (de != NULL && de->td_node == NULL)
118 cnp->cn_flags |= ISWHITEOUT;
119 if (de == NULL || de->td_node == NULL) {
120 /* The entry was not found in the directory.
121 * This is OK if we are creating or renaming an
122 * entry and are working on the last component of
124 if ((cnp->cn_flags & ISLASTCN) &&
125 (cnp->cn_nameiop == CREATE || \
126 cnp->cn_nameiop == RENAME ||
127 (cnp->cn_nameiop == DELETE &&
128 cnp->cn_flags & DOWHITEOUT &&
129 cnp->cn_flags & ISWHITEOUT))) {
130 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
135 /* Keep the component name in the buffer for
137 cnp->cn_flags |= SAVENAME;
143 struct tmpfs_node *tnode;
145 /* The entry was found, so get its associated
149 /* If we are not at the last path component and
150 * found a non-directory or non-link entry (which
151 * may itself be pointing to a directory), raise
153 if ((tnode->tn_type != VDIR &&
154 tnode->tn_type != VLNK) &&
155 !(cnp->cn_flags & ISLASTCN)) {
160 /* If we are deleting or renaming the entry, keep
161 * track of its tmpfs_dirent so that it can be
162 * easily deleted later. */
163 if ((cnp->cn_flags & ISLASTCN) &&
164 (cnp->cn_nameiop == DELETE ||
165 cnp->cn_nameiop == RENAME)) {
166 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
171 /* Allocate a new vnode on the matching entry. */
172 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
173 cnp->cn_lkflags, vpp);
177 if ((dnode->tn_mode & S_ISTXT) &&
178 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
179 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
185 cnp->cn_flags |= SAVENAME;
187 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
188 cnp->cn_lkflags, vpp);
195 /* Store the result of this lookup in the cache. Avoid this if the
196 * request was for creation, as it does not improve timings on
198 if ((cnp->cn_flags & MAKEENTRY) != 0)
199 cache_enter(dvp, *vpp, cnp);
202 /* If there were no errors, *vpp cannot be null and it must be
204 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
210 tmpfs_create(struct vop_create_args *v)
212 struct vnode *dvp = v->a_dvp;
213 struct vnode **vpp = v->a_vpp;
214 struct componentname *cnp = v->a_cnp;
215 struct vattr *vap = v->a_vap;
218 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
220 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
221 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0)
222 cache_enter(dvp, *vpp, cnp);
227 tmpfs_mknod(struct vop_mknod_args *v)
229 struct vnode *dvp = v->a_dvp;
230 struct vnode **vpp = v->a_vpp;
231 struct componentname *cnp = v->a_cnp;
232 struct vattr *vap = v->a_vap;
234 if (vap->va_type != VBLK && vap->va_type != VCHR &&
235 vap->va_type != VFIFO)
238 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
242 tmpfs_open(struct vop_open_args *v)
244 struct vnode *vp = v->a_vp;
245 int mode = v->a_mode;
248 struct tmpfs_node *node;
250 MPASS(VOP_ISLOCKED(vp));
252 node = VP_TO_TMPFS_NODE(vp);
254 /* The file is still active but all its names have been removed
255 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
256 * it is about to die. */
257 if (node->tn_links < 1)
260 /* If the file is marked append-only, deny write requests. */
261 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
265 /* For regular files, the call below is nop. */
266 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags &
267 OBJ_DEAD) == 0, ("dead object"));
268 vnode_create_vobject(vp, node->tn_size, v->a_td);
271 MPASS(VOP_ISLOCKED(vp));
276 tmpfs_close(struct vop_close_args *v)
278 struct vnode *vp = v->a_vp;
280 /* Update node times. */
287 tmpfs_access(struct vop_access_args *v)
289 struct vnode *vp = v->a_vp;
290 accmode_t accmode = v->a_accmode;
291 struct ucred *cred = v->a_cred;
294 struct tmpfs_node *node;
296 MPASS(VOP_ISLOCKED(vp));
298 node = VP_TO_TMPFS_NODE(vp);
300 switch (vp->v_type) {
306 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
326 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
331 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
332 node->tn_gid, accmode, cred, NULL);
335 MPASS(VOP_ISLOCKED(vp));
341 tmpfs_getattr(struct vop_getattr_args *v)
343 struct vnode *vp = v->a_vp;
344 struct vattr *vap = v->a_vap;
346 struct tmpfs_node *node;
348 node = VP_TO_TMPFS_NODE(vp);
352 vap->va_type = vp->v_type;
353 vap->va_mode = node->tn_mode;
354 vap->va_nlink = node->tn_links;
355 vap->va_uid = node->tn_uid;
356 vap->va_gid = node->tn_gid;
357 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
358 vap->va_fileid = node->tn_id;
359 vap->va_size = node->tn_size;
360 vap->va_blocksize = PAGE_SIZE;
361 vap->va_atime = node->tn_atime;
362 vap->va_mtime = node->tn_mtime;
363 vap->va_ctime = node->tn_ctime;
364 vap->va_birthtime = node->tn_birthtime;
365 vap->va_gen = node->tn_gen;
366 vap->va_flags = node->tn_flags;
367 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
368 node->tn_rdev : NODEV;
369 if (vp->v_type == VREG) {
370 obj = node->tn_reg.tn_aobj;
371 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE;
373 vap->va_bytes = node->tn_size;
380 tmpfs_setattr(struct vop_setattr_args *v)
382 struct vnode *vp = v->a_vp;
383 struct vattr *vap = v->a_vap;
384 struct ucred *cred = v->a_cred;
385 struct thread *td = curthread;
389 MPASS(VOP_ISLOCKED(vp));
393 /* Abort if any unsettable attribute is given. */
394 if (vap->va_type != VNON ||
395 vap->va_nlink != VNOVAL ||
396 vap->va_fsid != VNOVAL ||
397 vap->va_fileid != VNOVAL ||
398 vap->va_blocksize != VNOVAL ||
399 vap->va_gen != VNOVAL ||
400 vap->va_rdev != VNOVAL ||
401 vap->va_bytes != VNOVAL)
404 if (error == 0 && (vap->va_flags != VNOVAL))
405 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
407 if (error == 0 && (vap->va_size != VNOVAL))
408 error = tmpfs_chsize(vp, vap->va_size, cred, td);
410 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
411 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
413 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
414 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
416 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
417 vap->va_atime.tv_nsec != VNOVAL) ||
418 (vap->va_mtime.tv_sec != VNOVAL &&
419 vap->va_mtime.tv_nsec != VNOVAL) ||
420 (vap->va_birthtime.tv_sec != VNOVAL &&
421 vap->va_birthtime.tv_nsec != VNOVAL)))
422 error = tmpfs_chtimes(vp, vap, cred, td);
424 /* Update the node times. We give preference to the error codes
425 * generated by this function rather than the ones that may arise
426 * from tmpfs_update. */
429 MPASS(VOP_ISLOCKED(vp));
435 tmpfs_read(struct vop_read_args *v)
439 struct tmpfs_node *node;
442 if (vp->v_type != VREG)
445 if (uio->uio_offset < 0)
447 node = VP_TO_TMPFS_NODE(vp);
448 node->tn_status |= TMPFS_NODE_ACCESSED;
449 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio));
453 tmpfs_write(struct vop_write_args *v)
457 struct tmpfs_node *node;
463 ioflag = v->a_ioflag;
465 node = VP_TO_TMPFS_NODE(vp);
466 oldsize = node->tn_size;
468 if (uio->uio_offset < 0 || vp->v_type != VREG)
470 if (uio->uio_resid == 0)
472 if (ioflag & IO_APPEND)
473 uio->uio_offset = node->tn_size;
474 if (uio->uio_offset + uio->uio_resid >
475 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
477 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
479 if (uio->uio_offset + uio->uio_resid > node->tn_size) {
480 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
486 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio);
487 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
489 if (node->tn_mode & (S_ISUID | S_ISGID)) {
490 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
491 node->tn_mode &= ~(S_ISUID | S_ISGID);
494 (void)tmpfs_reg_resize(vp, oldsize, TRUE);
497 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
498 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
504 tmpfs_fsync(struct vop_fsync_args *v)
506 struct vnode *vp = v->a_vp;
508 MPASS(VOP_ISLOCKED(vp));
510 tmpfs_check_mtime(vp);
517 tmpfs_remove(struct vop_remove_args *v)
519 struct vnode *dvp = v->a_dvp;
520 struct vnode *vp = v->a_vp;
523 struct tmpfs_dirent *de;
524 struct tmpfs_mount *tmp;
525 struct tmpfs_node *dnode;
526 struct tmpfs_node *node;
528 MPASS(VOP_ISLOCKED(dvp));
529 MPASS(VOP_ISLOCKED(vp));
531 if (vp->v_type == VDIR) {
536 dnode = VP_TO_TMPFS_DIR(dvp);
537 node = VP_TO_TMPFS_NODE(vp);
538 tmp = VFS_TO_TMPFS(vp->v_mount);
539 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
542 /* Files marked as immutable or append-only cannot be deleted. */
543 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
544 (dnode->tn_flags & APPEND)) {
549 /* Remove the entry from the directory; as it is a file, we do not
550 * have to change the number of hard links of the directory. */
551 tmpfs_dir_detach(dvp, de);
552 if (v->a_cnp->cn_flags & DOWHITEOUT)
553 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
555 /* Free the directory entry we just deleted. Note that the node
556 * referred by it will not be removed until the vnode is really
558 tmpfs_free_dirent(tmp, de);
560 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
569 tmpfs_link(struct vop_link_args *v)
571 struct vnode *dvp = v->a_tdvp;
572 struct vnode *vp = v->a_vp;
573 struct componentname *cnp = v->a_cnp;
576 struct tmpfs_dirent *de;
577 struct tmpfs_node *node;
579 MPASS(VOP_ISLOCKED(dvp));
580 MPASS(cnp->cn_flags & HASBUF);
581 MPASS(dvp != vp); /* XXX When can this be false? */
582 node = VP_TO_TMPFS_NODE(vp);
584 /* Ensure that we do not overflow the maximum number of links imposed
586 MPASS(node->tn_links <= LINK_MAX);
587 if (node->tn_links == LINK_MAX) {
592 /* We cannot create links of files marked immutable or append-only. */
593 if (node->tn_flags & (IMMUTABLE | APPEND)) {
598 /* Allocate a new directory entry to represent the node. */
599 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
600 cnp->cn_nameptr, cnp->cn_namelen, &de);
604 /* Insert the new directory entry into the appropriate directory. */
605 if (cnp->cn_flags & ISWHITEOUT)
606 tmpfs_dir_whiteout_remove(dvp, cnp);
607 tmpfs_dir_attach(dvp, de);
609 /* vp link count has changed, so update node times. */
610 node->tn_status |= TMPFS_NODE_CHANGED;
620 * We acquire all but fdvp locks using non-blocking acquisitions. If we
621 * fail to acquire any lock in the path we will drop all held locks,
622 * acquire the new lock in a blocking fashion, and then release it and
623 * restart the rename. This acquire/release step ensures that we do not
624 * spin on a lock waiting for release. On error release all vnode locks
625 * and decrement references the way tmpfs_rename() would do.
628 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
629 struct vnode *tdvp, struct vnode **tvpp,
630 struct componentname *fcnp, struct componentname *tcnp)
634 struct tmpfs_dirent *de;
635 int error, restarts = 0;
638 if (*tvpp != NULL && *tvpp != tdvp)
639 VOP_UNLOCK(*tvpp, 0);
644 error = vn_lock(fdvp, LK_EXCLUSIVE);
647 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
649 error = vn_lock(tdvp, LK_EXCLUSIVE);
656 * Re-resolve fvp to be certain it still exists and fetch the
659 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
663 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
664 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
670 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
676 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
681 * Concurrent rename race.
694 VOP_UNLOCK(*fvpp, 0);
696 * Re-resolve tvp and acquire the vnode lock if present.
698 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
700 * If tvp disappeared we just carry on.
702 if (de == NULL && *tvpp != NULL) {
707 * Get the tvp ino if the lookup succeeded. We may have to restart
708 * if the non-blocking acquire fails.
712 error = tmpfs_alloc_vp(mp, de->td_node,
713 LK_EXCLUSIVE | LK_NOWAIT, &nvp);
722 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
728 * fdvp contains fvp, thus tvp (=fdvp) is not empty.
737 tmpfs_rename_restarts += restarts;
747 tmpfs_rename_restarts += restarts;
753 tmpfs_rename(struct vop_rename_args *v)
755 struct vnode *fdvp = v->a_fdvp;
756 struct vnode *fvp = v->a_fvp;
757 struct componentname *fcnp = v->a_fcnp;
758 struct vnode *tdvp = v->a_tdvp;
759 struct vnode *tvp = v->a_tvp;
760 struct componentname *tcnp = v->a_tcnp;
761 struct mount *mp = NULL;
765 struct tmpfs_dirent *de;
766 struct tmpfs_mount *tmp;
767 struct tmpfs_node *fdnode;
768 struct tmpfs_node *fnode;
769 struct tmpfs_node *tnode;
770 struct tmpfs_node *tdnode;
772 MPASS(VOP_ISLOCKED(tdvp));
773 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
774 MPASS(fcnp->cn_flags & HASBUF);
775 MPASS(tcnp->cn_flags & HASBUF);
777 /* Disallow cross-device renames.
778 * XXX Why isn't this done by the caller? */
779 if (fvp->v_mount != tdvp->v_mount ||
780 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
785 /* If source and target are the same file, there is nothing to do. */
791 /* If we need to move the directory between entries, lock the
792 * source so that we can safely operate on it. */
793 if (fdvp != tdvp && fdvp != tvp) {
794 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
796 error = vfs_busy(mp, 0);
801 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
807 ASSERT_VOP_ELOCKED(fdvp,
808 "tmpfs_rename: fdvp not locked");
809 ASSERT_VOP_ELOCKED(tdvp,
810 "tmpfs_rename: tdvp not locked");
812 ASSERT_VOP_ELOCKED(tvp,
813 "tmpfs_rename: tvp not locked");
821 tmp = VFS_TO_TMPFS(tdvp->v_mount);
822 tdnode = VP_TO_TMPFS_DIR(tdvp);
823 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
824 fdnode = VP_TO_TMPFS_DIR(fdvp);
825 fnode = VP_TO_TMPFS_NODE(fvp);
826 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
828 /* Entry can disappear before we lock fdvp,
829 * also avoid manipulating '.' and '..' entries. */
831 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
832 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
838 MPASS(de->td_node == fnode);
840 /* If re-naming a directory to another preexisting directory
841 * ensure that the target directory is empty so that its
842 * removal causes no side effects.
843 * Kern_rename gurantees the destination to be a directory
844 * if the source is one. */
846 MPASS(tnode != NULL);
848 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
849 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
854 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
855 if (tnode->tn_size > 0) {
859 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
862 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
866 MPASS(fnode->tn_type != VDIR &&
867 tnode->tn_type != VDIR);
871 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
872 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
877 /* Ensure that we have enough memory to hold the new name, if it
878 * has to be changed. */
879 if (fcnp->cn_namelen != tcnp->cn_namelen ||
880 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
881 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
885 /* If the node is being moved to another directory, we have to do
887 if (fdnode != tdnode) {
888 /* In case we are moving a directory, we have to adjust its
889 * parent to point to the new parent. */
890 if (de->td_node->tn_type == VDIR) {
891 struct tmpfs_node *n;
893 /* Ensure the target directory is not a child of the
894 * directory being moved. Otherwise, we'd end up
895 * with stale nodes. */
897 /* TMPFS_LOCK garanties that no nodes are freed while
898 * traversing the list. Nodes can only be marked as
899 * removed: tn_parent == NULL. */
902 while (n != n->tn_dir.tn_parent) {
903 struct tmpfs_node *parent;
906 TMPFS_NODE_UNLOCK(n);
910 free(newname, M_TMPFSNAME);
913 parent = n->tn_dir.tn_parent;
914 TMPFS_NODE_UNLOCK(n);
915 if (parent == NULL) {
919 TMPFS_NODE_LOCK(parent);
920 if (parent->tn_dir.tn_parent == NULL) {
921 TMPFS_NODE_UNLOCK(parent);
931 free(newname, M_TMPFSNAME);
934 TMPFS_NODE_UNLOCK(n);
936 /* Adjust the parent pointer. */
937 TMPFS_VALIDATE_DIR(fnode);
938 TMPFS_NODE_LOCK(de->td_node);
939 de->td_node->tn_dir.tn_parent = tdnode;
940 TMPFS_NODE_UNLOCK(de->td_node);
942 /* As a result of changing the target of the '..'
943 * entry, the link count of the source and target
944 * directories has to be adjusted. */
945 TMPFS_NODE_LOCK(tdnode);
946 TMPFS_ASSERT_LOCKED(tdnode);
948 TMPFS_NODE_UNLOCK(tdnode);
950 TMPFS_NODE_LOCK(fdnode);
951 TMPFS_ASSERT_LOCKED(fdnode);
953 TMPFS_NODE_UNLOCK(fdnode);
957 /* Do the move: just remove the entry from the source directory
958 * and insert it into the target one. */
959 tmpfs_dir_detach(fdvp, de);
961 if (fcnp->cn_flags & DOWHITEOUT)
962 tmpfs_dir_whiteout_add(fdvp, fcnp);
963 if (tcnp->cn_flags & ISWHITEOUT)
964 tmpfs_dir_whiteout_remove(tdvp, tcnp);
966 /* If the name has changed, we need to make it effective by changing
967 * it in the directory entry. */
968 if (newname != NULL) {
969 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
971 free(de->ud.td_name, M_TMPFSNAME);
972 de->ud.td_name = newname;
973 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen);
975 fnode->tn_status |= TMPFS_NODE_CHANGED;
976 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
979 /* If we are overwriting an entry, we have to remove the old one
980 * from the target directory. */
982 struct tmpfs_dirent *tde;
984 /* Remove the old entry from the target directory. */
985 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp);
986 tmpfs_dir_detach(tdvp, tde);
988 /* Free the directory entry we just deleted. Note that the
989 * node referred by it will not be removed until the vnode is
990 * really reclaimed. */
991 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
994 tmpfs_dir_attach(tdvp, de);
999 cache_purge_negative(tdvp);
1004 if (fdvp != tdvp && fdvp != tvp)
1005 VOP_UNLOCK(fdvp, 0);
1008 /* Release target nodes. */
1009 /* XXX: I don't understand when tdvp can be the same as tvp, but
1010 * other code takes care of this... */
1018 /* Release source nodes. */
1029 tmpfs_mkdir(struct vop_mkdir_args *v)
1031 struct vnode *dvp = v->a_dvp;
1032 struct vnode **vpp = v->a_vpp;
1033 struct componentname *cnp = v->a_cnp;
1034 struct vattr *vap = v->a_vap;
1036 MPASS(vap->va_type == VDIR);
1038 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
1042 tmpfs_rmdir(struct vop_rmdir_args *v)
1044 struct vnode *dvp = v->a_dvp;
1045 struct vnode *vp = v->a_vp;
1048 struct tmpfs_dirent *de;
1049 struct tmpfs_mount *tmp;
1050 struct tmpfs_node *dnode;
1051 struct tmpfs_node *node;
1053 MPASS(VOP_ISLOCKED(dvp));
1054 MPASS(VOP_ISLOCKED(vp));
1056 tmp = VFS_TO_TMPFS(dvp->v_mount);
1057 dnode = VP_TO_TMPFS_DIR(dvp);
1058 node = VP_TO_TMPFS_DIR(vp);
1060 /* Directories with more than two entries ('.' and '..') cannot be
1062 if (node->tn_size > 0) {
1067 if ((dnode->tn_flags & APPEND)
1068 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1073 /* This invariant holds only if we are not trying to remove "..".
1074 * We checked for that above so this is safe now. */
1075 MPASS(node->tn_dir.tn_parent == dnode);
1077 /* Get the directory entry associated with node (vp). This was
1078 * filled by tmpfs_lookup while looking up the entry. */
1079 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
1080 MPASS(TMPFS_DIRENT_MATCHES(de,
1081 v->a_cnp->cn_nameptr,
1082 v->a_cnp->cn_namelen));
1084 /* Check flags to see if we are allowed to remove the directory. */
1085 if (dnode->tn_flags & APPEND
1086 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1092 /* Detach the directory entry from the directory (dnode). */
1093 tmpfs_dir_detach(dvp, de);
1094 if (v->a_cnp->cn_flags & DOWHITEOUT)
1095 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
1097 /* No vnode should be allocated for this entry from this point */
1098 TMPFS_NODE_LOCK(node);
1099 TMPFS_ASSERT_ELOCKED(node);
1101 node->tn_dir.tn_parent = NULL;
1102 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1103 TMPFS_NODE_MODIFIED;
1105 TMPFS_NODE_UNLOCK(node);
1107 TMPFS_NODE_LOCK(dnode);
1108 TMPFS_ASSERT_ELOCKED(dnode);
1110 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1111 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1112 TMPFS_NODE_UNLOCK(dnode);
1117 /* Free the directory entry we just deleted. Note that the node
1118 * referred by it will not be removed until the vnode is really
1120 tmpfs_free_dirent(tmp, de);
1122 /* Release the deleted vnode (will destroy the node, notify
1123 * interested parties and clean it from the cache). */
1125 dnode->tn_status |= TMPFS_NODE_CHANGED;
1135 tmpfs_symlink(struct vop_symlink_args *v)
1137 struct vnode *dvp = v->a_dvp;
1138 struct vnode **vpp = v->a_vpp;
1139 struct componentname *cnp = v->a_cnp;
1140 struct vattr *vap = v->a_vap;
1141 char *target = v->a_target;
1143 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1144 MPASS(vap->va_type == VLNK);
1146 vap->va_type = VLNK;
1149 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
1153 tmpfs_readdir(struct vop_readdir_args *v)
1155 struct vnode *vp = v->a_vp;
1156 struct uio *uio = v->a_uio;
1157 int *eofflag = v->a_eofflag;
1158 u_long **cookies = v->a_cookies;
1159 int *ncookies = v->a_ncookies;
1164 struct tmpfs_node *node;
1166 /* This operation only makes sense on directory nodes. */
1167 if (vp->v_type != VDIR)
1171 node = VP_TO_TMPFS_DIR(vp);
1173 startresid = uio->uio_resid;
1175 /* Allocate cookies for NFS and compat modules. */
1176 if (cookies != NULL && ncookies != NULL) {
1177 maxcookies = howmany(node->tn_size,
1178 sizeof(struct tmpfs_dirent)) + 2;
1179 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
1184 if (cookies == NULL)
1185 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL);
1187 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies,
1190 /* Buffer was filled without hitting EOF. */
1191 if (error == EJUSTRETURN)
1192 error = (uio->uio_resid != startresid) ? 0 : EINVAL;
1194 if (error != 0 && cookies != NULL)
1195 free(*cookies, M_TEMP);
1197 if (eofflag != NULL)
1199 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1205 tmpfs_readlink(struct vop_readlink_args *v)
1207 struct vnode *vp = v->a_vp;
1208 struct uio *uio = v->a_uio;
1211 struct tmpfs_node *node;
1213 MPASS(uio->uio_offset == 0);
1214 MPASS(vp->v_type == VLNK);
1216 node = VP_TO_TMPFS_NODE(vp);
1218 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1220 node->tn_status |= TMPFS_NODE_ACCESSED;
1226 tmpfs_inactive(struct vop_inactive_args *v)
1229 struct tmpfs_node *node;
1232 node = VP_TO_TMPFS_NODE(vp);
1233 if (node->tn_links == 0)
1236 tmpfs_check_mtime(vp);
1241 tmpfs_reclaim(struct vop_reclaim_args *v)
1243 struct vnode *vp = v->a_vp;
1245 struct tmpfs_mount *tmp;
1246 struct tmpfs_node *node;
1248 node = VP_TO_TMPFS_NODE(vp);
1249 tmp = VFS_TO_TMPFS(vp->v_mount);
1251 if (vp->v_type == VREG)
1252 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj);
1254 vnode_destroy_vobject(vp);
1255 vp->v_object = NULL;
1258 TMPFS_NODE_LOCK(node);
1259 TMPFS_ASSERT_ELOCKED(node);
1262 /* If the node referenced by this vnode was deleted by the user,
1263 * we must free its associated data structures (now that the vnode
1264 * is being reclaimed). */
1265 if (node->tn_links == 0 &&
1266 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1267 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1268 TMPFS_NODE_UNLOCK(node);
1269 tmpfs_free_node(tmp, node);
1271 TMPFS_NODE_UNLOCK(node);
1273 MPASS(vp->v_data == NULL);
1278 tmpfs_print(struct vop_print_args *v)
1280 struct vnode *vp = v->a_vp;
1282 struct tmpfs_node *node;
1284 node = VP_TO_TMPFS_NODE(vp);
1286 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n",
1287 node, node->tn_flags, node->tn_links);
1288 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n",
1289 node->tn_mode, node->tn_uid, node->tn_gid,
1290 (intmax_t)node->tn_size, node->tn_status);
1292 if (vp->v_type == VFIFO)
1301 tmpfs_pathconf(struct vop_pathconf_args *v)
1303 int name = v->a_name;
1304 register_t *retval = v->a_retval;
1327 case _PC_CHOWN_RESTRICTED:
1339 case _PC_FILESIZEBITS:
1340 *retval = 0; /* XXX Don't know which value should I return. */
1351 tmpfs_vptofh(struct vop_vptofh_args *ap)
1353 struct tmpfs_fid *tfhp;
1354 struct tmpfs_node *node;
1356 tfhp = (struct tmpfs_fid *)ap->a_fhp;
1357 node = VP_TO_TMPFS_NODE(ap->a_vp);
1359 tfhp->tf_len = sizeof(struct tmpfs_fid);
1360 tfhp->tf_id = node->tn_id;
1361 tfhp->tf_gen = node->tn_gen;
1367 tmpfs_whiteout(struct vop_whiteout_args *ap)
1369 struct vnode *dvp = ap->a_dvp;
1370 struct componentname *cnp = ap->a_cnp;
1371 struct tmpfs_dirent *de;
1373 switch (ap->a_flags) {
1377 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1379 return (de->td_node == NULL ? 0 : EEXIST);
1380 return (tmpfs_dir_whiteout_add(dvp, cnp));
1382 tmpfs_dir_whiteout_remove(dvp, cnp);
1385 panic("tmpfs_whiteout: unknown op");
1390 * vnode operations vector used for files stored in a tmpfs file system.
1392 struct vop_vector tmpfs_vnodeop_entries = {
1393 .vop_default = &default_vnodeops,
1394 .vop_lookup = vfs_cache_lookup,
1395 .vop_cachedlookup = tmpfs_lookup,
1396 .vop_create = tmpfs_create,
1397 .vop_mknod = tmpfs_mknod,
1398 .vop_open = tmpfs_open,
1399 .vop_close = tmpfs_close,
1400 .vop_access = tmpfs_access,
1401 .vop_getattr = tmpfs_getattr,
1402 .vop_setattr = tmpfs_setattr,
1403 .vop_read = tmpfs_read,
1404 .vop_write = tmpfs_write,
1405 .vop_fsync = tmpfs_fsync,
1406 .vop_remove = tmpfs_remove,
1407 .vop_link = tmpfs_link,
1408 .vop_rename = tmpfs_rename,
1409 .vop_mkdir = tmpfs_mkdir,
1410 .vop_rmdir = tmpfs_rmdir,
1411 .vop_symlink = tmpfs_symlink,
1412 .vop_readdir = tmpfs_readdir,
1413 .vop_readlink = tmpfs_readlink,
1414 .vop_inactive = tmpfs_inactive,
1415 .vop_reclaim = tmpfs_reclaim,
1416 .vop_print = tmpfs_print,
1417 .vop_pathconf = tmpfs_pathconf,
1418 .vop_vptofh = tmpfs_vptofh,
1419 .vop_whiteout = tmpfs_whiteout,
1420 .vop_bmap = VOP_EOPNOTSUPP,