2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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 AUTHORS 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 AUTHORS 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 G_LABEL_MSDOSFS_DIR "msdosfs"
40 #define FAT12 "FAT12 "
41 #define FAT16 "FAT16 "
42 #define FAT32 "FAT32 "
44 #define NO_NAME "NO NAME "
48 g_label_msdosfs_taste(struct g_consumer *cp, char *label, size_t size)
50 struct g_provider *pp;
51 char *sector, *volume;
54 g_topology_assert_not();
58 sector = (char *)g_read_data(cp, 0, pp->sectorsize, NULL);
61 if (strncmp(sector + 0x36, FAT12, strlen(FAT12)) == 0) {
62 G_LABEL_DEBUG(1, "MSDOS (FAT12) file system detected on %s.",
64 volume = sector + 0x2b;
65 } else if (strncmp(sector + 0x36, FAT16, strlen(FAT16)) == 0) {
66 G_LABEL_DEBUG(1, "MSDOS (FAT16) file system detected on %s.",
68 volume = sector + 0x2b;
69 } else if (strncmp(sector + 0x52, FAT32, strlen(FAT32)) == 0) {
70 G_LABEL_DEBUG(1, "MSDOS (FAT32) file system detected on %s.",
72 volume = sector + 0x47;
77 if (strncmp(volume, NO_NAME, VOLUME_LEN) == 0) {
81 if (volume[0] == '\0') {
86 strlcpy(label, volume, MIN(size, VOLUME_LEN));
88 for (i = size - 1; i > 0; i--) {
91 else if (label[i] == ' ')
98 const struct g_label_desc g_label_msdosfs = {
99 .ld_taste = g_label_msdosfs_taste,
100 .ld_dir = G_LABEL_MSDOSFS_DIR