use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/nilfs.c b/libblkid/nilfs.c
new file mode 100644
index 0000000..1f8f3a6
--- /dev/null
+++ b/libblkid/nilfs.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2010 by Jiro SEKIBA <jir@unicus.jp>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License
+ */
+#include <stddef.h>
+#include <string.h>
+
+#include "superblocks.h"
+#include "crc32.h"
+
+struct nilfs_super_block {
+ uint32_t s_rev_level;
+ uint16_t s_minor_rev_level;
+ uint16_t s_magic;
+
+ uint16_t s_bytes;
+
+ uint16_t s_flags;
+ uint32_t s_crc_seed;
+ uint32_t s_sum;
+
+ uint32_t s_log_block_size;
+
+ uint64_t s_nsegments;
+ uint64_t s_dev_size;
+ uint64_t s_first_data_block;
+ uint32_t s_blocks_per_segment;
+ uint32_t s_r_segments_percentage;
+
+ uint64_t s_last_cno;
+ uint64_t s_last_pseg;
+ uint64_t s_last_seq;
+ uint64_t s_free_blocks_count;
+
+ uint64_t s_ctime;
+
+ uint64_t s_mtime;
+ uint64_t s_wtime;
+ uint16_t s_mnt_count;
+ uint16_t s_max_mnt_count;
+ uint16_t s_state;
+ uint16_t s_errors;
+ uint64_t s_lastcheck;
+
+ uint32_t s_checkinterval;
+ uint32_t s_creator_os;
+ uint16_t s_def_resuid;
+ uint16_t s_def_resgid;
+ uint32_t s_first_ino;
+
+ uint16_t s_inode_size;
+ uint16_t s_dat_entry_size;
+ uint16_t s_checkpoint_size;
+ uint16_t s_segment_usage_size;
+
+ uint8_t s_uuid[16];
+ char s_volume_name[80];
+
+ uint32_t s_c_interval;
+ uint32_t s_c_block_max;
+ uint32_t s_reserved[192];
+};
+
+/* nilfs2 magic string */
+#define NILFS_SB_MAGIC "\x34\x34"
+/* nilfs2 super block offset */
+#define NILFS_SB_OFF 0x400
+/* nilfs2 super block offset in kB */
+#define NILFS_SB_KBOFF (NILFS_SB_OFF >> 10)
+/* nilfs2 magic string offset within super block */
+#define NILFS_MAG_OFF 6
+
+static int probe_nilfs2(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct nilfs_super_block *sb;
+ static unsigned char sum[4];
+ const int sumoff = offsetof(struct nilfs_super_block, s_sum);
+ size_t bytes;
+ uint32_t crc;
+
+ sb = blkid_probe_get_sb(pr, mag, struct nilfs_super_block);
+ if (!sb)
+ return -1;
+
+ bytes = le16_to_cpu(sb->s_bytes);
+ crc = crc32(le32_to_cpu(sb->s_crc_seed), (unsigned char *)sb, sumoff);
+ crc = crc32(crc, sum, 4);
+ crc = crc32(crc, (unsigned char *)sb + sumoff + 4, bytes - sumoff - 4);
+
+ if (crc != le32_to_cpu(sb->s_sum))
+ return -1;
+
+ if (strlen(sb->s_volume_name))
+ blkid_probe_set_label(pr, (unsigned char *) sb->s_volume_name,
+ sizeof(sb->s_volume_name));
+
+ blkid_probe_set_uuid(pr, sb->s_uuid);
+ blkid_probe_sprintf_version(pr, "%u", le32_to_cpu(sb->s_rev_level));
+
+ return 0;
+}
+
+const struct blkid_idinfo nilfs2_idinfo =
+{
+ .name = "nilfs2",
+ .usage = BLKID_USAGE_FILESYSTEM,
+ .probefunc = probe_nilfs2,
+ .magics =
+ {
+ {
+ .magic = NILFS_SB_MAGIC,
+ .len = 2,
+ .kboff = NILFS_SB_KBOFF,
+ .sboff = NILFS_MAG_OFF
+ },
+ { NULL }
+ }
+};