2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2006 Red Hat, Inc. <redhat.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
26 #include "libvolume_id.h"
27 #include "libvolume_id-private.h"
30 /* Common gfs/gfs2 constants: */
31 #define GFS_MAGIC 0x01161970
32 #define GFS_DEFAULT_BSIZE 4096
33 #define GFS_SUPERBLOCK_OFFSET (0x10 * GFS_DEFAULT_BSIZE)
34 #define GFS_METATYPE_SB 1
35 #define GFS_FORMAT_SB 100
36 #define GFS_LOCKNAME_LEN 64
39 #define GFS_FORMAT_FS 1309
40 #define GFS_FORMAT_MULTI 1401
42 #define GFS2_FORMAT_FS 1801
43 #define GFS2_FORMAT_MULTI 1900
45 struct gfs2_meta_header {
48 uint64_t __pad0; /* Was generation number in gfs1 */
50 uint32_t __pad1; /* Was incarnation number in gfs1 */
54 uint64_t no_formal_ino;
59 struct gfs2_meta_header sb_header;
61 uint32_t sb_fs_format;
62 uint32_t sb_multihost_format;
63 uint32_t __pad0; /* Was superblock flags in gfs1 */
66 uint32_t sb_bsize_shift;
67 uint32_t __pad1; /* Was journal segment size in gfs1 */
69 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
70 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
71 struct gfs2_inum sb_root_dir;
73 char sb_lockproto[GFS_LOCKNAME_LEN];
74 char sb_locktable[GFS_LOCKNAME_LEN];
75 /* In gfs1, quota and license dinodes followed */
78 static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int vers)
82 info("probing at offset 0x%llx\n", (unsigned long long) off);
84 sbd = (struct gfs2_sb *)
85 volume_id_get_buffer(id, off + GFS_SUPERBLOCK_OFFSET, sizeof(struct gfs2_sb));
89 if (be32_to_cpu(sbd->sb_header.mh_magic) == GFS_MAGIC &&
90 be32_to_cpu(sbd->sb_header.mh_type) == GFS_METATYPE_SB) {
92 if (be32_to_cpu(sbd->sb_fs_format) != GFS_FORMAT_FS ||
93 be32_to_cpu(sbd->sb_multihost_format) != GFS_FORMAT_MULTI)
94 return -1; /* not gfs1 */
98 if (be32_to_cpu(sbd->sb_fs_format) != GFS2_FORMAT_FS ||
99 be32_to_cpu(sbd->sb_multihost_format) != GFS2_FORMAT_MULTI)
100 return -1; /* not gfs2 */
106 if (strlen(sbd->sb_locktable)) {
107 uint8_t *label = (uint8_t *) sbd->sb_locktable;
109 volume_id_set_label_raw(id, label, GFS_LOCKNAME_LEN);
110 volume_id_set_label_string(id, label, GFS_LOCKNAME_LEN);
112 strcpy(id->type_version, "1");
113 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
119 int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size)
121 return volume_id_probe_gfs_generic(id, off, 1);
124 int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size)
126 return volume_id_probe_gfs_generic(id, off, 2);