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128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2006 Red Hat, Inc. <redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "libvolume_id.h"
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#include "libvolume_id-private.h"
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#include "util.h"
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/* Common gfs/gfs2 constants: */
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#define GFS_MAGIC 0x01161970
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#define GFS_DEFAULT_BSIZE 4096
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#define GFS_SUPERBLOCK_OFFSET (0x10 * GFS_DEFAULT_BSIZE)
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#define GFS_METATYPE_SB 1
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#define GFS_FORMAT_SB 100
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#define GFS_LOCKNAME_LEN 64
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/* gfs1 constants: */
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#define GFS_FORMAT_FS 1309
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#define GFS_FORMAT_MULTI 1401
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/* gfs2 constants: */
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#define GFS2_FORMAT_FS 1801
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#define GFS2_FORMAT_MULTI 1900
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struct gfs2_meta_header {
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uint32_t mh_magic;
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uint32_t mh_type;
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uint64_t __pad0; /* Was generation number in gfs1 */
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uint32_t mh_format;
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uint32_t __pad1; /* Was incarnation number in gfs1 */
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};
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struct gfs2_inum {
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uint64_t no_formal_ino;
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uint64_t no_addr;
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};
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struct gfs2_sb {
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struct gfs2_meta_header sb_header;
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uint32_t sb_fs_format;
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uint32_t sb_multihost_format;
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uint32_t __pad0; /* Was superblock flags in gfs1 */
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uint32_t sb_bsize;
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uint32_t sb_bsize_shift;
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uint32_t __pad1; /* Was journal segment size in gfs1 */
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struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
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struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
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struct gfs2_inum sb_root_dir;
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char sb_lockproto[GFS_LOCKNAME_LEN];
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char sb_locktable[GFS_LOCKNAME_LEN];
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/* In gfs1, quota and license dinodes followed */
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} PACKED;
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static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int vers)
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{
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struct gfs2_sb *sbd;
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info("probing at offset 0x%llx\n", (unsigned long long) off);
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sbd = (struct gfs2_sb *)
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volume_id_get_buffer(id, off + GFS_SUPERBLOCK_OFFSET, sizeof(struct gfs2_sb));
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if (sbd == NULL)
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return -1;
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if (be32_to_cpu(sbd->sb_header.mh_magic) == GFS_MAGIC &&
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be32_to_cpu(sbd->sb_header.mh_type) == GFS_METATYPE_SB) {
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if (vers == 1) {
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if (be32_to_cpu(sbd->sb_fs_format) != GFS_FORMAT_FS ||
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be32_to_cpu(sbd->sb_multihost_format) != GFS_FORMAT_MULTI)
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return -1; /* not gfs1 */
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id->type = "gfs";
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}
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else if (vers == 2) {
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if (be32_to_cpu(sbd->sb_fs_format) != GFS2_FORMAT_FS ||
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be32_to_cpu(sbd->sb_multihost_format) != GFS2_FORMAT_MULTI)
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return -1; /* not gfs2 */
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id->type = "gfs2";
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}
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else
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return -1;
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if (strlen(sbd->sb_locktable)) {
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uint8_t *label = (uint8_t *) sbd->sb_locktable;
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volume_id_set_label_raw(id, label, GFS_LOCKNAME_LEN);
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volume_id_set_label_string(id, label, GFS_LOCKNAME_LEN);
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}
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strcpy(id->type_version, "1");
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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return 0;
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}
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return -1;
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}
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int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size)
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{
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return volume_id_probe_gfs_generic(id, off, 1);
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}
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int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size)
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{
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return volume_id_probe_gfs_generic(id, off, 2);
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}
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