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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 magic;
uint32_t inode_count;
uint32_t mod_time;
uint32_t block_size;
uint32_t frag_count;
uint16_t compressor;
uint16_t block_log;
uint16_t flags;
uint16_t id_count;
uint16_t version_major;
uint16_t version_minor;
uint64_t root_inode;
uint64_t bytes_used;
uint64_t id_table;
uint64_t xattr_table;
uint64_t inode_table;
uint64_t dir_table;
uint64_t frag_table;
uint64_t export_table;
} __attribute__((packed));
static int probe_squashfs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct sqsh_super_block *sq;
uint16_t vermaj;
uint16_t vermin;
sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block);
if (!sq)
return errno ? -errno : 1;
vermaj = le16_to_cpu(sq->version_major);
vermin = le16_to_cpu(sq->version_minor);
if (vermaj < 4)
return 1;
blkid_probe_sprintf_version(pr, "%u.%u", vermaj, vermin);
blkid_probe_set_fsblocksize(pr, le32_to_cpu(sq->block_size));
blkid_probe_set_block_size(pr, le32_to_cpu(sq->block_size));
blkid_probe_set_fssize(pr, le64_to_cpu(sq->bytes_used));
return 0;
}
static int probe_squashfs3(blkid_probe pr, const struct blkid_idmag *mag)
{
struct sqsh_super_block *sq;
uint16_t vermaj;
uint16_t vermin;
enum BLKID_ENDIANNESS endianness;
sq = blkid_probe_get_sb(pr, mag, struct sqsh_super_block);
if (!sq)
return errno ? -errno : 1;
if (strcmp(mag->magic, "sqsh") == 0) {
vermaj = be16_to_cpu(sq->version_major);
vermin = be16_to_cpu(sq->version_minor);
endianness = BLKID_ENDIANNESS_BIG;
} else {
vermaj = le16_to_cpu(sq->version_major);
vermin = le16_to_cpu(sq->version_minor);
endianness = BLKID_ENDIANNESS_LITTLE;
}
if (vermaj > 3)
return 1;
blkid_probe_sprintf_version(pr, "%u.%u", vermaj, vermin);
blkid_probe_set_fsblocksize(pr, 1024);
blkid_probe_set_block_size(pr, 1024);
blkid_probe_set_fsendianness(pr, endianness);
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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