/*
* Copyright (C) 2009 by Andreas Dilger <adilger@sun.com>
*
* 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 <errno.h>
#include <ctype.h>
#include <inttypes.h>
#include "superblocks.h"
/* #include <sys/uberblock_impl.h> */
#define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */
struct zfs_uberblock {
uint64_t ub_magic; /* UBERBLOCK_MAGIC */
uint64_t ub_version; /* SPA_VERSION */
uint64_t ub_txg; /* txg of last sync */
uint64_t ub_guid_sum; /* sum of all vdev guids */
uint64_t ub_timestamp; /* UTC time of last sync */
char ub_rootbp; /* MOS objset_phys_t */
} __attribute__((packed));
static int probe_zfs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct zfs_uberblock *ub;
uint64_t spa_version;
ub = blkid_probe_get_sb(pr, mag, struct zfs_uberblock);
if (!ub)
return -1;
if (ub->ub_magic == be64_to_cpu(UBERBLOCK_MAGIC))
spa_version = be64_to_cpu(ub->ub_version);
else
spa_version = le64_to_cpu(ub->ub_version);
blkid_probe_sprintf_version(pr, "%" PRIu64, spa_version);
#if 0
/* read nvpair data for pool name, pool GUID from the MOS, but
* unfortunately this is more complex than it could be */
blkid_probe_set_label(pr, pool_name, pool_len));
blkid_probe_set_uuid(pr, pool_guid);
#endif
return 0;
}
const struct blkid_idinfo zfs_idinfo =
{
.name = "zfs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_zfs,
.minsz = 64 * 1024 * 1024,
.magics =
{
/* ZFS has 128 root blocks (#4 is the first used), check only 6 of them */
{ .magic = "\0\0\0\0\0\xba\xb1\x0c", .len = 8, .kboff = 128 },
{ .magic = "\x0c\xb1\xba\0\0\0\0\0", .len = 8, .kboff = 128 },
{ .magic = "\0\0\0\0\0\xba\xb1\x0c", .len = 8, .kboff = 132 },
{ .magic = "\x0c\xb1\xba\0\0\0\0\0", .len = 8, .kboff = 132 },
{ .magic = "\0\0\0\0\0\xba\xb1\x0c", .len = 8, .kboff = 136 },
{ .magic = "\x0c\xb1\xba\0\0\0\0\0", .len = 8, .kboff = 136 },
{ .magic = "\0\0\0\0\0\xba\xb1\x0c", .len = 8, .kboff = 384 },
{ .magic = "\x0c\xb1\xba\0\0\0\0\0", .len = 8, .kboff = 384 },
{ .magic = "\0\0\0\0\0\xba\xb1\x0c", .len = 8, .kboff = 388 },
{ .magic = "\x0c\xb1\xba\0\0\0\0\0", .len = 8, .kboff = 388 },
{ .magic = "\0\0\0\0\0\xba\xb1\x0c", .len = 8, .kboff = 392 },
{ .magic = "\x0c\xb1\xba\0\0\0\0\0", .len = 8, .kboff = 392 },
{ NULL }
}
};
