FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_conf.c
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 * $FreeBSD$
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 "opt_bootp.h"
55
56 #include <sys/param.h> /* dev_t (types.h)*/
57 #include <sys/kernel.h>
58 #include <sys/systm.h> /* rootvp*/
59 #include <sys/proc.h> /* curproc*/
60 #include <sys/vnode.h> /* NULLVP*/
61 #include <sys/mount.h> /* struct mount*/
62 #include <sys/malloc.h> /* M_MOUNT*/
63
64 /*
65 * GLOBALS
66 */
67
68 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
69
70 /*
71 * These define the root filesystem, device, and root filesystem type.
72 */
73 dev_t rootdevs[] = { NODEV, NODEV };
74 char *rootdevnames[2];
75 struct vnode *rootvnode;
76 char *mountrootfsname;
77 #ifdef BOOTP
78 extern void bootpc_init __P((void));
79 #endif
80
81 /*
82 * vfs_init() will set maxvfsconf
83 * to the highest defined type number.
84 */
85 int maxvfsconf;
86 struct vfsconf *vfsconf;
87
88 /*
89 * Common root mount code shared by all filesystems
90 */
91 #define ROOTNAME "root_device"
92
93 /*
94 * vfs_mountrootfs
95 *
96 * Common entry point for root mounts
97 *
98 * PARAMETERS:
99 * NONE
100 *
101 * RETURNS: 0 Success
102 * !0 error number (errno.h)
103 *
104 * LOCK STATE:
105 * ENTRY
106 * <no locks held>
107 * EXIT
108 * <no locks held>
109 *
110 * NOTES:
111 * This code is currently supported only for use for
112 * the FFS file system type. This is a matter of
113 * fixing the other file systems, not this code!
114 */
115 static void
116 vfs_mountrootfs(void *unused)
117 {
118 struct mount *mp;
119 int i, err;
120 struct proc *p = curproc; /* XXX */
121 dev_t orootdev;
122
123 #ifdef BOOTP
124 bootpc_init();
125 #endif
126 /*
127 * New root mount structure
128 */
129 if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) {
130 printf("error %d: ", err);
131 panic("cannot mount root\n");
132 return ;
133 }
134 mp->mnt_flag |= MNT_ROOTFS;
135
136 /*
137 * Attempt the mount
138 */
139 err = ENXIO;
140 orootdev = rootdev;
141 if (rootdevs[0] == NODEV)
142 rootdevs[0] = rootdev;
143 for (i = 0; i < sizeof(rootdevs) / sizeof(rootdevs[0]); i++) {
144 if (rootdevs[i] == NODEV)
145 break;
146 rootdev = rootdevs[i];
147 if (rootdev != orootdev) {
148 printf("changing root device to %s\n", rootdevnames[i]);
149 orootdev = rootdev;
150 }
151 strncpy(mp->mnt_stat.f_mntfromname,
152 rootdevnames[i] ? rootdevnames[i] : ROOTNAME, MNAMELEN - 1);
153 err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
154 if (err != ENXIO)
155 break;
156 }
157 if (err) {
158 /*
159 * XXX should ask the user for the name in some cases.
160 * Why do we call vfs_unbusy() here and not after ENXIO
161 * is returned above?
162 */
163 vfs_unbusy(mp, p);
164 /*
165 * free mount struct before failing
166 * (hardly worthwhile with the PANIC eh?)
167 */
168 free( mp, M_MOUNT);
169 printf("error %d: ", err);
170 panic("cannot mount root (2)\n");
171 return;
172 }
173
174 simple_lock(&mountlist_slock);
175
176 /*
177 * Add fs to list of mounted file systems
178 */
179 CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
180
181 simple_unlock(&mountlist_slock);
182 vfs_unbusy(mp, p);
183
184 /* root mount, update system time from FS specific data*/
185 inittodr(mp->mnt_time);
186 return;
187 }
188
189 SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, vfs_mountrootfs, NULL)
190
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