summaryrefslogtreecommitdiffstats
path: root/sys/kern/vfs_mount.c
blob: fb8061bbfde22b5395febd959e3f469721d75eee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1995 Artisoft, Inc.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)vfs_conf.c	8.8 (Berkeley) 3/31/94
 * $FreeBSD$
 */

/*
 * PURPOSE:	This file abstracts the root mounting interface from
 *		the per file system semantics for handling mounts,
 *		the overall intent of which is to move the BSD
 *		internals dependence out of the FS code, both to
 *		make the FS code more portable and to free up some
 *		of the BSD internals so that they may more easily
 *		be changed.
 *
 * NOTE1:	Code is single entry/single exit to aid debugging
 *		and conversion for kernel multithreading.
 *
 * NOTE2:	Code notes lock state in headers on entry and exit
 *		as an aid to conversion for kernel multithreading
 *		on SMP reentrancy
 */
#include <sys/param.h>		/* dev_t (types.h)*/
#include <sys/systm.h>		/* rootvp*/
#include <sys/proc.h>		/* curproc*/
#include <sys/vnode.h>		/* NULLVP*/
#include <sys/mount.h>		/* struct mount*/
#include <sys/malloc.h>		/* M_MOUNT*/

/*
 * GLOBALS
 */
int (*mountroot) __P((void *));
struct vnode *rootvnode;
struct vfsops	*mountrootvfsops;


/*
 * Common root mount code shared by all filesystems
 */
#define ROOTDIR		"/"
#define ROOTNAME	"root_device"



/*
 * vfs_mountroot
 *
 * Common entry point for root mounts
 *
 * PARAMETERS:
 *		data	pointer to the vfs_ops for the FS type mounting
 *
 * RETURNS:	0	Success
 *		!0	error number (errno.h)
 *
 * LOCK STATE:
 *		ENTRY
 *			<no locks held>
 *		EXIT
 *			<no locks held>
 *
 * NOTES:
 *		This code is currently supported only for use for
 *		the FFS file system type.  This is a matter of
 *		fixing the other file systems, not this code!
 */
int
vfs_mountroot(data)
	void			*data;
{
	struct mount		*mp;
	u_int			size;
	int			err = 0;
	struct proc		*p = curproc;	/* XXX */
	struct vfsops		*mnt_op = (struct vfsops *)data;

	/*
	 *  New root mount structure
	 */
	mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
	bzero((char *)mp, (u_long)sizeof(struct mount));
	mp->mnt_op		= mnt_op;
	mp->mnt_flag		= MNT_ROOTFS;
	mp->mnt_vnodecovered	= NULLVP;

	/*
	 * Lock mount point
	 */
	if( ( err = vfs_lock(mp)) != 0)
		goto error_1;

	/* Save "last mounted on" info for mount point (NULL pad)*/
	copystr(	ROOTDIR,			/* mount point*/
			mp->mnt_stat.f_mntonname,	/* save area*/
			MNAMELEN - 1,			/* max size*/
			&size);				/* real size*/
	bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);

	/* Save "mounted from" info for mount point (NULL pad)*/
	copystr(	ROOTNAME,			/* device name*/
			mp->mnt_stat.f_mntfromname,	/* save area*/
			MNAMELEN - 1,			/* max size*/
			&size);				/* real size*/
	bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);

	/*
	 * Attempt the mount
	 */
	err = VFS_MOUNT( mp, NULL, NULL, NULL, p);
	if( err)
		goto error_2;

	/* Add fs to list of mounted file systems*/
	CIRCLEQ_INSERT_TAIL( &mountlist, mp, mnt_list);

	/* Unlock mount point*/
	vfs_unlock(mp);

	/* root mount, update system time from FS specific data*/
	inittodr( mp->mnt_time);

	goto success;


error_2:	/* mount error*/

	/* unlock before failing*/
	vfs_unlock( mp);

error_1:	/* lock error*/

	/* free mount struct before failing*/
	free( mp, M_MOUNT);

success:
	return( err);
}
OpenPOWER on IntegriCloud