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/*
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* Inspired by libvolume_id by
* Kay Sievers <kay.sievers@vrfy.org>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include "bitops.h" /* swab16() */
#include "superblocks.h"
struct sqsh_super_block {
uint32_t s_magic;
uint32_t inodes;
uint32_t bytes_used_2;
uint32_t uid_start_2;
uint32_t guid_start_2;
uint32_t inode_table_start_2;
uint32_t directory_table_start_2;
uint16_t s_major;
uint16_t s_minor;
} __attribute__((packed));
static int probe_squashfs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct sqsh_super_block *sq;
uint16_t major;
uint16_t minor;
sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block);
if (!sq)
return errno ? -errno : 1;
major = le16_to_cpu(sq->s_major);
minor = le16_to_cpu(sq->s_minor);
if (major < 4)
return 1;
blkid_probe_sprintf_version(pr, "%u.%u", major, minor);
return 0;
}
static int probe_squashfs3(blkid_probe pr, const struct blkid_idmag *mag)
{
struct sqsh_super_block *sq;
uint16_t major;
uint16_t minor;
sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block);
if (!sq)
return errno ? -errno : 1;
if (strcmp(mag->magic, "sqsh") == 0) {
major = be16_to_cpu(sq->s_major);
minor = be16_to_cpu(sq->s_minor);
} else {
major = le16_to_cpu(sq->s_major);
minor = le16_to_cpu(sq->s_minor);
}
if (major > 3)
return 1;
blkid_probe_sprintf_version(pr, "%u.%u", major, minor);
return 0;
}
const struct blkid_idinfo squashfs_idinfo =
{
.name = "squashfs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_squashfs,
.magics =
{
{ .magic = "hsqs", .len = 4 },
{ NULL }
}
};
const struct blkid_idinfo squashfs3_idinfo =
{
.name = "squashfs3",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_squashfs3,
.magics =
{
{ .magic = "sqsh", .len = 4 }, /* big endian */
{ .magic = "hsqs", .len = 4 }, /* little endian */
{ NULL }
}
};
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