vfs_mount.c revision 31403 
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 * $Id: vfs_conf.c,v 1.17 1997/11/07 08:53:10 phk Exp $
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/kernel.h>
56#include <sys/systm.h>		/* rootvp*/
57#include <sys/proc.h>		/* curproc*/
58#include <sys/vnode.h>		/* NULLVP*/
59#include <sys/mount.h>		/* struct mount*/
60#include <sys/malloc.h>		/* M_MOUNT*/
61
62/*
63 * GLOBALS
64 */
65
66MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
67
68/*
69 *  These define the root filesystem, device, and root filesystem type.
70 */
71struct mount *rootfs;
72struct vnode *rootvnode;
73char *mountrootfsname;
74
75/*
76 * vfs_init() will set maxvfsconf
77 * to the highest defined type number.
78 */
79int maxvfsconf;
80struct vfsconf *vfsconf;
81
82/*
83 * Common root mount code shared by all filesystems
84 */
85#define ROOTNAME	"root_device"
86
87/*
88 * vfs_mountrootfs
89 *
90 * Common entry point for root mounts
91 *
92 * PARAMETERS:
93 *		fsname	name of the filesystem
94 *
95 * RETURNS:	0	Success
96 *		!0	error number (errno.h)
97 *
98 * LOCK STATE:
99 *		ENTRY
100 *			<no locks held>
101 *		EXIT
102 *			<no locks held>
103 *
104 * NOTES:
105 *		This code is currently supported only for use for
106 *		the FFS file system type.  This is a matter of
107 *		fixing the other file systems, not this code!
108 */
109static int
110vfs_mountrootfs(fsname)
111	char			*fsname;
112{
113	struct mount		*mp;
114	int			err = 0;
115	struct proc		*p = curproc;	/* XXX */
116
117	/*
118	 *  New root mount structure
119	 */
120	err = vfs_rootmountalloc(fsname, ROOTNAME, &mp);
121	if (err)
122		return (err);
123	mp->mnt_flag		|= MNT_ROOTFS;
124
125	/*
126	 * Attempt the mount
127	 */
128	err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
129	if (err)
130		goto error_2;
131
132	simple_lock(&mountlist_slock);
133	/* Add fs to list of mounted file systems*/
134	CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
135	simple_unlock(&mountlist_slock);
136
137	vfs_unbusy(mp, p);
138
139	/* root mount, update system time from FS specific data*/
140	inittodr(mp->mnt_time);
141
142	goto success;
143
144
145error_2:	/* mount error*/
146
147	vfs_unbusy(mp, p);
148
149	/* free mount struct before failing*/
150	free( mp, M_MOUNT);
151
152success:
153	return( err);
154}
155
156/* ARGSUSED*/
157static void xxx_vfs_mountroot __P((void *fsnamep));
158#ifdef BOOTP
159extern void bootpc_init __P((void));
160#endif
161static void
162xxx_vfs_mountroot(fsnamep)
163	void *fsnamep;
164{
165  /* XXX Add a separate SYSINIT entry */
166#ifdef BOOTP
167	bootpc_init();
168#endif
169	/* Mount the root file system. */
170	if (vfs_mountrootfs(*((char **) fsnamep)))
171		panic("cannot mount root");
172}
173SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, xxx_vfs_mountroot,
174	&mountrootfsname)
175
176