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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2016-05-20 17:01:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 17:58:30 -0700
commit8da4b8c48e7b43cb16d05e1dbb34ad9f73ab7efd (patch)
treeac716b243f71c117360535610790d1c6b9164590 /lib/uuid.c
parentb8b572789cde5118b2cee49d426d48fcf5b30e47 (diff)
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lib/uuid.c: move generate_random_uuid() to uuid.c
Let's gather the UUID related functions under one hood. 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>
Diffstat (limited to 'lib/uuid.c')
-rw-r--r--lib/uuid.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/lib/uuid.c b/lib/uuid.c
index 398821e4dce1..6c81c0b0467e 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -23,6 +23,26 @@
#include <linux/uuid.h>
#include <linux/random.h>
+/***************************************************************
+ * Random UUID interface
+ *
+ * Used here for a Boot ID, but can be useful for other kernel
+ * drivers.
+ ***************************************************************/
+
+/*
+ * Generate random UUID
+ */
+void generate_random_uuid(unsigned char uuid[16])
+{
+ get_random_bytes(uuid, 16);
+ /* Set UUID version to 4 --- truly random generation */
+ uuid[6] = (uuid[6] & 0x0F) | 0x40;
+ /* Set the UUID variant to DCE */
+ uuid[8] = (uuid[8] & 0x3F) | 0x80;
+}
+EXPORT_SYMBOL(generate_random_uuid);
+
static void __uuid_gen_common(__u8 b[16])
{
prandom_bytes(b, 16);