vfs_mount.c revision 22521 
1/*
2 * Copyright (c) 1989, 1993, 1995
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 1995 Artisoft, Inc.  All Rights Reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by the University of
17 *	California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)vfs_conf.c	8.8 (Berkeley) 3/31/94
35 * $FreeBSD: head/sys/kern/vfs_mount.c 22521 1997-02-10 02:22:35Z dyson $
36 */
37
38/*
39 * PURPOSE:	This file abstracts the root mounting interface from
40 *		the per file system semantics for handling mounts,
41 *		the overall intent of which is to move the BSD
42 *		internals dependence out of the FS code, both to
43 *		make the FS code more portable and to free up some
44 *		of the BSD internals so that they may more easily
45 *		be changed.
46 *
47 * NOTE1:	Code is single entry/single exit to aid debugging
48 *		and conversion for kernel multithreading.
49 *
50 * NOTE2:	Code notes lock state in headers on entry and exit
51 *		as an aid to conversion for kernel multithreading
52 *		on SMP reentrancy
53 */
54#include <sys/param.h>		/* dev_t (types.h)*/
55#include <sys/systm.h>		/* rootvp*/
56#include <sys/proc.h>		/* curproc*/
57#include <sys/vnode.h>		/* NULLVP*/
58#include <sys/mount.h>		/* struct mount*/
59#include <sys/malloc.h>		/* M_MOUNT*/
60
61/*
62 * GLOBALS
63 */
64
65/*
66 *  These define the root filesystem, device, and root filesystem type.
67 */
68struct mount *rootfs;
69struct vnode *rootvnode;
70char *mountrootfsname;
71
72/*
73 * vfs_init() will set maxvfsconf
74 * to the highest defined type number.
75 */
76int maxvfsconf;
77struct vfsconf *vfsconf;
78
79/*
80 * Common root mount code shared by all filesystems
81 */
82#define ROOTNAME	"root_device"
83
84/*
85 * vfs_mountrootfs
86 *
87 * Common entry point for root mounts
88 *
89 * PARAMETERS:
90 *		fsname	name of the filesystem
91 *
92 * RETURNS:	0	Success
93 *		!0	error number (errno.h)
94 *
95 * LOCK STATE:
96 *		ENTRY
97 *			<no locks held>
98 *		EXIT
99 *			<no locks held>
100 *
101 * NOTES:
102 *		This code is currently supported only for use for
103 *		the FFS file system type.  This is a matter of
104 *		fixing the other file systems, not this code!
105 */
106int
107vfs_mountrootfs(fsname)
108	char			*fsname;
109{
110	struct mount		*mp;
111	int			err = 0;
112	struct proc		*p = curproc;	/* XXX */
113
114	/*
115	 *  New root mount structure
116	 */
117	err = vfs_rootmountalloc(fsname, ROOTNAME, &mp);
118	if (err)
119		return (err);
120	mp->mnt_flag		|= MNT_ROOTFS;
121
122	/*
123	 * Attempt the mount
124	 */
125	err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
126	if (err)
127		goto error_2;
128
129	simple_lock(&mountlist_slock);
130	/* Add fs to list of mounted file systems*/
131	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
132	simple_unlock(&mountlist_slock);
133
134	vfs_unbusy(mp, p);
135
136	/* root mount, update system time from FS specific data*/
137	inittodr(mp->mnt_time);
138
139	goto success;
140
141
142error_2:	/* mount error*/
143
144	vfs_unbusy(mp, p);
145
146error_1:	/* lock error*/
147
148	/* free mount struct before failing*/
149	free( mp, M_MOUNT);
150
151success:
152	return( err);
153}
154