1/*	$OpenBSD: ufs_vfsops.c,v 1.20 2023/03/08 04:43:09 guenther Exp $	*/
2/*	$NetBSD: ufs_vfsops.c,v 1.4 1996/02/09 22:36:12 christos Exp $	*/
3
4/*
5 * Copyright (c) 1991, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	@(#)ufs_vfsops.c	8.4 (Berkeley) 4/16/94
38 */
39
40#include <sys/param.h>
41#include <sys/mbuf.h>
42#include <sys/mount.h>
43#include <sys/vnode.h>
44#include <sys/malloc.h>
45#include <sys/specdev.h>
46
47#include <ufs/ufs/quota.h>
48#include <ufs/ufs/inode.h>
49#include <ufs/ufs/ufsmount.h>
50#include <ufs/ufs/ufs_extern.h>
51#ifdef UFS_DIRHASH
52#include <ufs/ufs/dir.h>
53#include <ufs/ufs/dirhash.h>
54#endif
55
56/*
57 * Make a filesystem operational.
58 * Nothing to do at the moment.
59 */
60int
61ufs_start(struct mount *mp, int flags, struct proc *p)
62{
63	return (0);
64}
65
66/*
67 * Return the root of a filesystem.
68 */
69int
70ufs_root(struct mount *mp, struct vnode **vpp)
71{
72	struct vnode *nvp;
73	int error;
74
75	if ((error = VFS_VGET(mp, ROOTINO, &nvp)) != 0)
76		return (error);
77	*vpp = nvp;
78	return (0);
79}
80
81/*
82 * Verify a remote client has export rights and return these rights via.
83 * exflagsp and credanonp.
84 */
85int
86ufs_check_export(struct mount *mp, struct mbuf *nam, int *exflagsp,
87    struct ucred **credanonp)
88{
89	struct netcred *np;
90	struct ufsmount *ump = VFSTOUFS(mp);
91
92	/*
93	 * Get the export permission structure for this <mp, client> tuple.
94	 */
95	np = vfs_export_lookup(mp, &ump->um_export, nam);
96	if (np == NULL)
97		return (EACCES);
98
99	*exflagsp = np->netc_exflags;
100	*credanonp = &np->netc_anon;
101	return (0);
102}
103
104/*
105 * Initialize UFS file systems, done only once.
106 */
107int
108ufs_init(struct vfsconf *vfsp)
109{
110	static int done;
111
112	if (done)
113		return (0);
114	done = 1;
115	ufs_ihashinit();
116	ufs_quota_init();
117#ifdef UFS_DIRHASH
118	ufsdirhash_init();
119#endif
120
121	return (0);
122}
123
124/*
125 * This is the generic part of fhtovp called after the underlying
126 * filesystem has validated the file handle.
127 */
128int
129ufs_fhtovp(struct mount *mp, struct ufid *ufhp, struct vnode **vpp)
130{
131	struct inode *ip;
132	struct vnode *nvp;
133	int error;
134
135	if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
136		*vpp = NULLVP;
137		return (error);
138	}
139	ip = VTOI(nvp);
140	if (DIP(ip, mode) == 0 || DIP(ip, gen) != ufhp->ufid_gen) {
141		vput(nvp);
142		*vpp = NULLVP;
143		return (ESTALE);
144	}
145	*vpp = nvp;
146	return (0);
147}
148