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 EXT2FS_SB_OFFSET 1024
41 #define EXT2_SUPER_MAGIC 0xef53
42 #define EXT2_DYNAMIC_REV 1
50 char s_volume_name[16];
54 g_label_ext2fs_taste(struct g_consumer *cp, char *label, size_t size)
56 struct g_provider *pp;
60 g_topology_assert_not();
64 if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0)
67 fs = (e2sb_t *)g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL);
71 /* Check for magic and versio n*/
72 if (fs->s_magic == EXT2_SUPER_MAGIC &&
73 fs->s_rev_level == EXT2_DYNAMIC_REV) {
74 G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
80 s_volume_name = fs->s_volume_name;
82 s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
84 if (s_volume_name[0] == '/')
87 /* Check for volume label */
88 if (s_volume_name[0] == '\0')
91 strlcpy(label, s_volume_name, size);
97 struct g_label_desc g_label_ext2fs = {
98 .ld_taste = g_label_ext2fs_taste,
103 G_LABEL_INIT(ext2fs, g_label_ext2fs, "Create device nodes for EXT2FS volumes");