vfs_mount.c revision 31476 
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#ifdef BOOTP
75extern void bootpc_init __P((void));
76#endif
77
78/*
79 * vfs_init() will set maxvfsconf
80 * to the highest defined type number.
81 */
82int maxvfsconf;
83struct vfsconf *vfsconf;
84
85/*
86 * Common root mount code shared by all filesystems
87 */
88#define ROOTNAME	"root_device"
89
90/*
91 * vfs_mountrootfs
92 *
93 * Common entry point for root mounts
94 *
95 * PARAMETERS:
96 * 		NONE
97 *
98 * RETURNS:	0	Success
99 *		!0	error number (errno.h)
100 *
101 * LOCK STATE:
102 *		ENTRY
103 *			<no locks held>
104 *		EXIT
105 *			<no locks held>
106 *
107 * NOTES:
108 *		This code is currently supported only for use for
109 *		the FFS file system type.  This is a matter of
110 *		fixing the other file systems, not this code!
111 */
112static void
113vfs_mountrootfs(void *unused)
114{
115	struct mount		*mp;
116	int			err = 0;
117	struct proc		*p = curproc;	/* XXX */
118
119#ifdef BOOTP
120	bootpc_init();
121#endif
122	/*
123	 *  New root mount structure
124	 */
125	if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) {
126		printf("error %d: ", err);
127		panic("cannot mount root\n");
128		return ;
129	}
130	mp->mnt_flag		|= MNT_ROOTFS;
131
132	/*
133	 * Attempt the mount
134	 */
135	err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
136	if (err) {
137		vfs_unbusy(mp, p);
138		/*
139		 * free mount struct before failing
140		 * (hardly worthwhile with the PANIC eh?)
141		 */
142		free( mp, M_MOUNT);
143		printf("error %d: ", err);
144		panic("cannot mount root (2)\n");
145		return;
146	}
147
148	simple_lock(&mountlist_slock);
149
150	/*
151	 * Add fs to list of mounted file systems
152	 */
153	CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
154
155	simple_unlock(&mountlist_slock);
156	vfs_unbusy(mp, p);
157
158	/* root mount, update system time from FS specific data*/
159	inittodr(mp->mnt_time);
160	return;
161}
162
163SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, vfs_mountrootfs, NULL)
164
165