include/linux/genhd.h: move to use generic UUID library

UUID library provides uuid_be type and uuid_be_to_bin() function.  This
substitutes open coded variant by generic library calls.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/genhd.h

@@ -14,6 +14,7 @@
 #include <linux/rcupdate.h>
 #include <linux/slab.h>
 #include <linux/percpu-refcount.h>
+#include <linux/uuid.h>
 
 #ifdef CONFIG_BLOCK
 
@@ -93,7 +94,7 @@ struct disk_stats {
  * Enough for the string representation of any kind of UUID plus NULL.
  * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
  */
-#define PARTITION_META_INFO_UUIDLTH	37
+#define PARTITION_META_INFO_UUIDLTH	(UUID_STRING_LEN + 1)
 
 struct partition_meta_info {
 	char uuid[PARTITION_META_INFO_UUIDLTH];
@@ -228,27 +229,9 @@ static inline struct gendisk *part_to_disk(struct hd_struct *part)
 	return NULL;
 }
 
-static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
-{
-	int i;
-	for (i = 0; i < 16; ++i) {
-		*to++ = (hex_to_bin(*uuid_str) << 4) |
-			(hex_to_bin(*(uuid_str + 1)));
-		uuid_str += 2;
-		switch (i) {
-		case 3:
-		case 5:
-		case 7:
-		case 9:
-			uuid_str++;
-			continue;
-		}
-	}
-}
-
 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
 {
-	part_pack_uuid(uuid_str, to);
+	uuid_be_to_bin(uuid_str, (uuid_be *)to);
 	return 0;
 }