2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/pathname.h>
35 #include <sys/vnode.h>
38 lookupname(char *dirname, enum uio_seg seg, enum symfollow follow,
39 vnode_t **dirvpp, vnode_t **compvpp)
42 return (lookupnameat(dirname, seg, follow, dirvpp, compvpp, NULL));
46 lookupnameat(char *dirname, enum uio_seg seg, enum symfollow follow,
47 vnode_t **dirvpp, vnode_t **compvpp, vnode_t *startvp)
52 ASSERT(dirvpp == NULL);
55 ltype = VOP_ISLOCKED(startvp);
56 VOP_UNLOCK(startvp, 0);
57 NDINIT_ATVP(&nd, LOOKUP, LOCKLEAF | MPSAFE | follow, seg, dirname,
61 NDFREE(&nd, NDF_ONLY_PNBUF);
62 vn_lock(startvp, ltype | LK_RETRY);
67 traverse(vnode_t **cvpp, int lktype)
78 * If this vnode is mounted on, then we transparently indirect
79 * to the vnode which is the root of the mounted file system.
80 * Before we do this we must check that an unmount is not in
81 * progress on this vnode.
86 * Reached the end of the mount chain?
88 vfsp = vn_mountedvfs(cvp);
92 * tvp is NULL for *cvpp vnode, which we can't unlock.
100 * The read lock must be held across the call to VFS_ROOT() to
101 * prevent a concurrent unmount from destroying the vfs.
103 error = VFS_ROOT(vfsp, lktype, &tvp);