2 * Copyright (c) 2005 Stanislav Sedov
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
35 #include <geom/geom.h>
36 #include <geom/label/g_label.h>
38 #define EXT2FS_SB_OFFSET 1024
39 #define EXT2_SUPER_MAGIC 0xef53
40 #define EXT2_DYNAMIC_REV 1
48 char s_volume_name[16];
52 g_label_ext2fs_taste(struct g_consumer *cp, char *label, size_t size)
54 struct g_provider *pp;
57 g_topology_assert_not();
61 if ((EXT2FS_SB_OFFSET % pp->sectorsize) != 0)
64 fs = (e2sb_t *)g_read_data(cp, EXT2FS_SB_OFFSET, pp->sectorsize, NULL);
68 /* Check for magic and versio n*/
69 if (fs->s_magic == EXT2_SUPER_MAGIC &&
70 fs->s_rev_level == EXT2_DYNAMIC_REV) {
71 G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
77 /* Check for volume label */
78 if (fs->s_volume_name[0] == '\0')
82 fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
83 strlcpy(label, fs->s_volume_name, size);
89 const struct g_label_desc g_label_ext2fs = {
90 .ld_taste = g_label_ext2fs_taste,