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uuid: Provide a GUID generator for raw buffer

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In some cases we would like to generate a GUID and export it.  Though it
would require either casting to internal kernel types or an intermediate
buffer. Instead we may achieve this by supplying a pointer to raw buffer
and make a complimentary API to existing one for UUIDs.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Andy Shevchenko 2020-02-24 17:37:50 +02:00 committed by David Sterba
parent d01cd62400
commit 48a2e88f53
2 changed files with 11 additions and 0 deletions
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1
include/linux/uuid.h
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@ -84,6 +84,7 @@ static inline bool uuid_is_null(const uuid_t *uuid)
} }
void generate_random_uuid(unsigned char uuid[16]); void generate_random_uuid(unsigned char uuid[16]);
void generate_random_guid(unsigned char guid[16]);
extern void guid_gen(guid_t *u); extern void guid_gen(guid_t *u);
extern void uuid_gen(uuid_t *u); extern void uuid_gen(uuid_t *u);

10
lib/uuid.c
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@ -40,6 +40,16 @@ void generate_random_uuid(unsigned char uuid[16])
} }
EXPORT_SYMBOL(generate_random_uuid); EXPORT_SYMBOL(generate_random_uuid);
void generate_random_guid(unsigned char guid[16])
{
get_random_bytes(guid, 16);
/* Set GUID version to 4 --- truly random generation */
guid[7] = (guid[7] & 0x0F) | 0x40;
/* Set the GUID variant to DCE */
guid[8] = (guid[8] & 0x3F) | 0x80;
}
EXPORT_SYMBOL(generate_random_guid);
static void __uuid_gen_common(__u8 b[16]) static void __uuid_gen_common(__u8 b[16])
{ {
prandom_bytes(b, 16); prandom_bytes(b, 16);