summaryrefslogtreecommitdiff
path: root/extras/volume_id/lib/gfs.c
diff options
context:
space:
mode:
authorKay Sievers <kay.sievers@suse.de>2006-05-30 16:01:28 +0200
committerKay Sievers <kay.sievers@suse.de>2006-05-30 16:01:28 +0200
commite55a73abb07e6949ebbf17fa08a3ddeaddbbc41f (patch)
treee6afa14671bbdda09669bf2ea5245ca6481126c3 /extras/volume_id/lib/gfs.c
parent47b3e9478c48dbe5f428bd6fc074eac78f2765c3 (diff)
libvolume_id: gfs + gfs2 support
Patch from Red Hat.
Diffstat (limited to 'extras/volume_id/lib/gfs.c')
-rw-r--r--extras/volume_id/lib/gfs.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/extras/volume_id/lib/gfs.c b/extras/volume_id/lib/gfs.c
new file mode 100644
index 0000000000..40a4493b32
--- /dev/null
+++ b/extras/volume_id/lib/gfs.c
@@ -0,0 +1,120 @@
+/*
+ * 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 version 2 of the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "libvolume_id.h"
+#include "util.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];
+ /* In gfs1, quota and license dinodes followed */
+} PACKED;
+
+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%llx", (unsigned long long) 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 &&
+ be32_to_cpu(sbd->sb_header.mh_format) == GFS_FORMAT_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;
+ 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)
+{
+ return volume_id_probe_gfs_generic(id, off, 1);
+}
+
+int volume_id_probe_gfs2(struct volume_id *id, uint64_t off)
+{
+ return volume_id_probe_gfs_generic(id, off, 2);
+}