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/*
* Copyright (C) 2010 by Jiro SEKIBA <jir@unicus.jp>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License
*/
#include <stddef.h>
#include <string.h>
#include "superblocks.h"
#include "crc32.h"
struct nilfs_super_block {
uint32_t s_rev_level;
uint16_t s_minor_rev_level;
uint16_t s_magic;
uint16_t s_bytes;
uint16_t s_flags;
uint32_t s_crc_seed;
uint32_t s_sum;
uint32_t s_log_block_size;
uint64_t s_nsegments;
uint64_t s_dev_size;
uint64_t s_first_data_block;
uint32_t s_blocks_per_segment;
uint32_t s_r_segments_percentage;
uint64_t s_last_cno;
uint64_t s_last_pseg;
uint64_t s_last_seq;
uint64_t s_free_blocks_count;
uint64_t s_ctime;
uint64_t s_mtime;
uint64_t s_wtime;
uint16_t s_mnt_count;
uint16_t s_max_mnt_count;
uint16_t s_state;
uint16_t s_errors;
uint64_t s_lastcheck;
uint32_t s_checkinterval;
uint32_t s_creator_os;
uint16_t s_def_resuid;
uint16_t s_def_resgid;
uint32_t s_first_ino;
uint16_t s_inode_size;
uint16_t s_dat_entry_size;
uint16_t s_checkpoint_size;
uint16_t s_segment_usage_size;
uint8_t s_uuid[16];
char s_volume_name[80];
uint32_t s_c_interval;
uint32_t s_c_block_max;
uint32_t s_reserved[192];
};
/* nilfs2 magic string */
#define NILFS_SB_MAGIC "\x34\x34"
/* nilfs2 super block offset */
#define NILFS_SB_OFF 0x400
/* nilfs2 super block offset in kB */
#define NILFS_SB_KBOFF (NILFS_SB_OFF >> 10)
/* nilfs2 magic string offset within super block */
#define NILFS_MAG_OFF 6
static int probe_nilfs2(blkid_probe pr, const struct blkid_idmag *mag)
{
struct nilfs_super_block *sb;
static unsigned char sum[4];
const int sumoff = offsetof(struct nilfs_super_block, s_sum);
size_t bytes;
uint32_t crc;
sb = blkid_probe_get_sb(pr, mag, struct nilfs_super_block);
if (!sb)
return -1;
bytes = le16_to_cpu(sb->s_bytes);
crc = crc32(le32_to_cpu(sb->s_crc_seed), (unsigned char *)sb, sumoff);
crc = crc32(crc, sum, 4);
crc = crc32(crc, (unsigned char *)sb + sumoff + 4, bytes - sumoff - 4);
if (crc != le32_to_cpu(sb->s_sum))
return -1;
if (strlen(sb->s_volume_name))
blkid_probe_set_label(pr, (unsigned char *) sb->s_volume_name,
sizeof(sb->s_volume_name));
blkid_probe_set_uuid(pr, sb->s_uuid);
blkid_probe_sprintf_version(pr, "%u", le32_to_cpu(sb->s_rev_level));
return 0;
}
const struct blkid_idinfo nilfs2_idinfo =
{
.name = "nilfs2",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_nilfs2,
.magics =
{
{
.magic = NILFS_SB_MAGIC,
.len = 2,
.kboff = NILFS_SB_KBOFF,
.sboff = NILFS_MAG_OFF
},
{ NULL }
}
};
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