use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/jfs.c b/libblkid/jfs.c
new file mode 100644
index 0000000..78c018c
--- /dev/null
+++ b/libblkid/jfs.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 1999 by Andries Brouwer
+ * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
+ * Copyright (C) 2001 by Andreas Dilger
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * 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 <errno.h>
+#include <ctype.h>
+#include <stdint.h>
+
+#include "superblocks.h"
+
+struct jfs_super_block {
+ unsigned char js_magic[4];
+ uint32_t js_version;
+ uint64_t js_size;
+ uint32_t js_bsize; /* 4: aggregate block size in bytes */
+ uint16_t js_l2bsize; /* 2: log2 of s_bsize */
+ uint16_t js_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
+ uint32_t js_pbsize; /* 4: hardware/LVM block size in bytes */
+ uint16_t js_l2pbsize; /* 2: log2 of s_pbsize */
+ uint16_t js_pad; /* 2: padding necessary for alignment */
+ uint32_t js_dummy2[26];
+ unsigned char js_uuid[16];
+ unsigned char js_label[16];
+ unsigned char js_loguuid[16];
+};
+
+static int probe_jfs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct jfs_super_block *js;
+
+ js = blkid_probe_get_sb(pr, mag, struct jfs_super_block);
+ if (!js)
+ return -1;
+ if (le32_to_cpu(js->js_bsize) != (1U << le16_to_cpu(js->js_l2bsize)))
+ return 1;
+ if (le32_to_cpu(js->js_pbsize) != (1U << le16_to_cpu(js->js_l2pbsize)))
+ return 1;
+ if ((le16_to_cpu(js->js_l2bsize) - le16_to_cpu(js->js_l2pbsize)) !=
+ le16_to_cpu(js->js_l2bfactor))
+ return 1;
+
+ if (strlen((char *) js->js_label))
+ blkid_probe_set_label(pr, js->js_label, sizeof(js->js_label));
+ blkid_probe_set_uuid(pr, js->js_uuid);
+ return 0;
+}
+
+
+const struct blkid_idinfo jfs_idinfo =
+{
+ .name = "jfs",
+ .usage = BLKID_USAGE_FILESYSTEM,
+ .probefunc = probe_jfs,
+ .minsz = 16 * 1024 * 1024,
+ .magics =
+ {
+ { .magic = "JFS1", .len = 4, .kboff = 32 },
+ { NULL }
+ }
+};
+