1/*-
2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
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28__FBSDID("$FreeBSD: head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c 191990 2009-05-11 15:33:26Z attilio $");
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| 28__FBSDID("$FreeBSD: head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c 241896 2012-10-22 17:50:54Z kib $"); |
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/pathname.h>
34#include <sys/vfs.h>
35#include <sys/vnode.h>
36
37int
38lookupname(char *dirname, enum uio_seg seg, enum symfollow follow,
39 vnode_t **dirvpp, vnode_t **compvpp)
40{
41
42 return (lookupnameat(dirname, seg, follow, dirvpp, compvpp, NULL));
43}
44
45int
46lookupnameat(char *dirname, enum uio_seg seg, enum symfollow follow,
47 vnode_t **dirvpp, vnode_t **compvpp, vnode_t *startvp)
48{
49 struct nameidata nd;
50 int error, ltype;
51
52 ASSERT(dirvpp == NULL);
53
54 vref(startvp);
55 ltype = VOP_ISLOCKED(startvp);
56 VOP_UNLOCK(startvp, 0);
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57 NDINIT_ATVP(&nd, LOOKUP, LOCKLEAF | MPSAFE | follow, seg, dirname,
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| 57 NDINIT_ATVP(&nd, LOOKUP, LOCKLEAF | follow, seg, dirname, |
58 startvp, curthread);
59 error = namei(&nd);
60 *compvpp = nd.ni_vp;
61 NDFREE(&nd, NDF_ONLY_PNBUF);
62 vn_lock(startvp, ltype | LK_RETRY);
63 return (error);
64}
65
66int
67traverse(vnode_t **cvpp, int lktype)
68{
69 vnode_t *cvp;
70 vnode_t *tvp;
71 vfs_t *vfsp;
72 int error;
73
74 cvp = *cvpp;
75 tvp = NULL;
76
77 /*
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.
82 */
83
84 for (;;) {
85 /*
86 * Reached the end of the mount chain?
87 */
88 vfsp = vn_mountedvfs(cvp);
89 if (vfsp == NULL)
90 break;
91 /*
92 * tvp is NULL for *cvpp vnode, which we can't unlock.
93 */
94 if (tvp != NULL)
95 vput(cvp);
96 else
97 vrele(cvp);
98
99 /*
100 * The read lock must be held across the call to VFS_ROOT() to
101 * prevent a concurrent unmount from destroying the vfs.
102 */
103 error = VFS_ROOT(vfsp, lktype, &tvp);
104 if (error != 0)
105 return (error);
106 cvp = tvp;
107 }
108
109 *cvpp = cvp;
110 return (0);
111}
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