2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005 Stanislav Sedov
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
37 #include <geom/geom.h>
38 #include <geom/label/g_label.h>
40 #define REISERFS_NEW_DISK_OFFSET 64 * 1024
41 #define REISERFS_OLD_DISK_OFFSET 8 * 1024
42 #define REISERFS_SUPER_MAGIC "ReIsEr"
44 typedef struct reiserfs_sb {
50 char s_volume_name[16];
53 static reiserfs_sb_t *
54 g_label_reiserfs_read_super(struct g_consumer *cp, off_t offset)
59 secsize = cp->provider->sectorsize;
61 if ((offset % secsize) != 0)
64 fs = (reiserfs_sb_t *)g_read_data(cp, offset, secsize, NULL);
68 if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC,
69 strlen(REISERFS_SUPER_MAGIC)) != 0) {
78 g_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size)
80 struct g_provider *pp;
83 g_topology_assert_not();
88 fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET);
91 fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET);
97 if (fs->s_version == 2) {
98 G_LABEL_DEBUG(1, "reiserfs file system detected on %s.",
104 /* Check for volume label */
105 if (fs->s_volume_name[0] == '\0')
108 /* Terminate label */
109 fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
110 strlcpy(label, fs->s_volume_name, size);
116 struct g_label_desc g_label_reiserfs = {
117 .ld_taste = g_label_reiserfs_taste,
118 .ld_dir = "reiserfs",
122 G_LABEL_INIT(reiserfs, g_label_reiserfs, "Create device nodes for REISERFS volumes");