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/*
* Copyright (C) 2008 Karel Zak <kzak@redhat.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 <stdint.h>
#include "superblocks.h"
/* Common gfs/gfs2 constants: */
#define GFS_LOCKNAME_LEN 64
/* gfs1 constants: */
#define GFS_FORMAT_FS 1309
#define GFS_FORMAT_MULTI 1401
struct gfs2_meta_header {
uint32_t mh_magic;
uint32_t mh_type;
uint64_t __pad0; /* Was generation number in gfs1 */
uint32_t mh_format;
uint32_t __pad1; /* Was incarnation number in gfs1 */
};
struct gfs2_inum {
uint64_t no_formal_ino;
uint64_t no_addr;
};
struct gfs2_sb {
struct gfs2_meta_header sb_header;
uint32_t sb_fs_format;
uint32_t sb_multihost_format;
uint32_t __pad0; /* Was superblock flags in gfs1 */
uint32_t sb_bsize;
uint32_t sb_bsize_shift;
uint32_t __pad1; /* Was journal segment size in gfs1 */
struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
struct gfs2_inum sb_root_dir;
char sb_lockproto[GFS_LOCKNAME_LEN];
char sb_locktable[GFS_LOCKNAME_LEN];
struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
struct gfs2_inum __pad4; /* Was license inode in gfs1 */
uint8_t sb_uuid[16]; /* The UUID maybe 0 for backwards compat */
} __attribute__((packed));
static int probe_gfs(blkid_probe pr, const struct blkid_idmag *mag)
{
const struct gfs2_sb *sbd;
sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb);
if (!sbd)
return errno ? -errno : 1;
if (be32_to_cpu(sbd->sb_fs_format) == GFS_FORMAT_FS &&
be32_to_cpu(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
{
if (*sbd->sb_locktable)
blkid_probe_set_label(pr,
(unsigned char *) sbd->sb_locktable,
sizeof(sbd->sb_locktable));
blkid_probe_set_uuid(pr, sbd->sb_uuid);
return 0;
}
return 1;
}
static inline int gfs2_format_is_valid(uint32_t format)
{
return (format >= 1800 && format < 1900);
}
static inline int gfs2_multiformat_is_valid(uint32_t multi)
{
return (multi >= 1900 && multi < 2000);
}
static int probe_gfs2(blkid_probe pr, const struct blkid_idmag *mag)
{
const struct gfs2_sb *sbd;
sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb);
if (!sbd)
return errno ? -errno : 1;
if (gfs2_format_is_valid(be32_to_cpu(sbd->sb_fs_format)) &&
gfs2_multiformat_is_valid(be32_to_cpu(sbd->sb_multihost_format)))
{
if (*sbd->sb_locktable)
blkid_probe_set_label(pr,
(unsigned char *) sbd->sb_locktable,
sizeof(sbd->sb_locktable));
blkid_probe_set_uuid(pr, sbd->sb_uuid);
blkid_probe_set_version(pr, "1");
blkid_probe_set_fsblocksize(pr, be32_to_cpu(sbd->sb_bsize));
blkid_probe_set_block_size(pr, be32_to_cpu(sbd->sb_bsize));
return 0;
}
return 1;
}
const struct blkid_idinfo gfs_idinfo =
{
.name = "gfs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_gfs,
.minsz = 32 * 1024 * 1024, /* minimal size of GFS journal */
.magics =
{
{ .magic = "\x01\x16\x19\x70", .len = 4, .kboff = 64 },
{ NULL }
}
};
const struct blkid_idinfo gfs2_idinfo =
{
.name = "gfs2",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_gfs2,
.minsz = 32 * 1024 * 1024, /* minimal size of GFS journal */
.magics =
{
{ .magic = "\x01\x16\x19\x70", .len = 4, .kboff = 64 },
{ NULL }
}
};
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