use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/gfs.c b/libblkid/gfs.c
new file mode 100644
index 0000000..b2c0163
--- /dev/null
+++ b/libblkid/gfs.c
@@ -0,0 +1,131 @@
+/*
+ * 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
+/* 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 */
+} __attribute__((packed));
+
+static int probe_gfs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct gfs2_sb *sbd;
+
+ sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb);
+ if (!sbd)
+ return -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 int probe_gfs2(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct gfs2_sb *sbd;
+
+ sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb);
+ if (!sbd)
+ return -1;
+
+ if (be32_to_cpu(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
+ be32_to_cpu(sbd->sb_multihost_format) == GFS2_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);
+ blkid_probe_set_version(pr, "1");
+ 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 }
+ }
+};
+