From e60683a0d553b6488c564863f4e48954944fb0f8 Mon Sep 17 00:00:00 2001
From: bigbiff bigbiff <bigbiff@teamw.in>
Date: Fri, 22 Feb 2013 20:55:50 -0500
Subject: use libblkid to get filesystem type we can now use libblkid to detect
 exfat

---
 libblkid/minix1.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 libblkid/minix1.c

(limited to 'libblkid/minix1.c')

diff --git a/libblkid/minix1.c b/libblkid/minix1.c
new file mode 100644
index 000000000..54e71396b
--- /dev/null
+++ b/libblkid/minix1.c
@@ -0,0 +1,94 @@
+/*
+ * 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 <string.h>
+#include "superblocks.h"
+#include "minix.h"
+
+static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	unsigned char *ext;
+	int version;
+
+	/* for more details see magic strings below */
+	switch(mag->magic[1]) {
+	case '\023':
+		version = 1;
+		break;
+	case '\044':
+		version = 2;
+		break;
+	case '\115':
+		version = 3;
+		break;
+	default:
+		return -1;
+		break;
+	}
+
+	if (version <= 2) {
+		struct minix_super_block *sb;
+		uint32_t zones;
+
+		sb = blkid_probe_get_sb(pr, mag, struct minix_super_block);
+		if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
+			return -1;
+
+		zones = version == 2 ? sb->s_zones : sb->s_nzones;
+
+		/* sanity checks to be sure that the FS is really minix */
+		if (sb->s_imap_blocks * MINIX_BLOCK_SIZE * 8 < sb->s_ninodes + 1)
+			return -1;
+		if (sb->s_zmap_blocks * MINIX_BLOCK_SIZE * 8 < zones - sb->s_firstdatazone + 1)
+			return -1;
+
+	} else if (version == 3) {
+		struct minix3_super_block *sb;
+
+		sb = blkid_probe_get_sb(pr, mag, struct minix3_super_block);
+		if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
+			return -1;
+
+	}
+
+	/* unfortunately, some parts of ext3 is sometimes possible to
+	 * interpreted as minix superblock. So check for extN magic
+	 * string. (For extN magic string and offsets see ext.c.)
+	 */
+	ext = blkid_probe_get_buffer(pr, 0x400 + 0x38, 2);
+	if (ext && memcmp(ext, "\123\357", 2) == 0)
+		return -1;
+
+	blkid_probe_sprintf_version(pr, "%d", version);
+	return 0;
+}
+
+const struct blkid_idinfo minix_idinfo =
+{
+	.name		= "minix",
+	.usage		= BLKID_USAGE_FILESYSTEM,
+	.probefunc	= probe_minix,
+	.magics		=
+	{
+		/* version 1 */
+		{ .magic = "\177\023", .len = 2, .kboff = 1, .sboff = 0x10 },
+		{ .magic = "\217\023", .len = 2, .kboff = 1, .sboff = 0x10 },
+
+		/* version 2 */
+		{ .magic = "\150\044", .len = 2, .kboff = 1, .sboff = 0x10 },
+		{ .magic = "\170\044", .len = 2, .kboff = 1, .sboff = 0x10 },
+
+		/* version 3 */
+		{ .magic = "\132\115", .len = 2, .kboff = 1, .sboff = 0x18 },
+		{ NULL }
+	}
+};
+
-- 
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