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/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2006 Red Hat, Inc. <redhat.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "libvolume_id.h"
#include "libvolume_id-private.h"
/* Common gfs/gfs2 constants: */
#define GFS_MAGIC 0x01161970
#define GFS_DEFAULT_BSIZE 4096
#define GFS_SUPERBLOCK_OFFSET (0x10 * GFS_DEFAULT_BSIZE)
#define GFS_METATYPE_SB 1
#define GFS_FORMAT_SB 100
#define GFS_LOCKNAME_LEN 64
/* gfs1 constants: */
#define GFS_FORMAT_FS 1309
#define GFS_FORMAT_MULTI 1401
/* gfs2 constants: */
#define GFS2_FORMAT_FS 1801
#define GFS2_FORMAT_MULTI 1900
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 licence inode in gfs1 */
uint8_t sb_uuid[16]; /* The UUID maybe 0 for backwards compat */
} PACKED;
static int uuid_non_zero(const uint8_t *p)
{
int i;
for (i = 0; i < 16; i++) {
if (p[i] != 0)
return 1;
}
return 0;
}
static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int vers)
{
struct gfs2_sb *sbd;
info("probing at offset 0x%" PRIx64 "\n", off);
sbd = (struct gfs2_sb *)
volume_id_get_buffer(id, off + GFS_SUPERBLOCK_OFFSET, sizeof(struct gfs2_sb));
if (sbd == NULL)
return -1;
if (be32_to_cpu(sbd->sb_header.mh_magic) == GFS_MAGIC &&
be32_to_cpu(sbd->sb_header.mh_type) == GFS_METATYPE_SB) {
if (vers == 1) {
if (be32_to_cpu(sbd->sb_fs_format) != GFS_FORMAT_FS ||
be32_to_cpu(sbd->sb_multihost_format) != GFS_FORMAT_MULTI)
return -1; /* not gfs1 */
id->type = "gfs";
}
else if (vers == 2) {
if (be32_to_cpu(sbd->sb_fs_format) != GFS2_FORMAT_FS ||
be32_to_cpu(sbd->sb_multihost_format) != GFS2_FORMAT_MULTI)
return -1; /* not gfs2 */
id->type = "gfs2";
}
else
return -1;
if (strlen(sbd->sb_locktable)) {
uint8_t *label = (uint8_t *) sbd->sb_locktable;
volume_id_set_label_raw(id, label, GFS_LOCKNAME_LEN);
volume_id_set_label_string(id, label, GFS_LOCKNAME_LEN);
}
if (vers == 2 && uuid_non_zero(sbd->sb_uuid))
volume_id_set_uuid(id, sbd->sb_uuid, 0, UUID_DCE);
strcpy(id->type_version, "1");
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
return 0;
}
return -1;
}
int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size)
{
return volume_id_probe_gfs_generic(id, off, 1);
}
int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size)
{
return volume_id_probe_gfs_generic(id, off, 2);
}
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