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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-02-24 17:37:50 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-03-23 17:01:47 +0100 |
| commit | 48a2e88f53aea4dface64883157ad3c428132f75 (patch) | |
| tree | a98c9c07b374ed0412968b414dee66fb533034b4 /lib | |
| parent | d01cd62400b3a42d012069518614d944c35f9c99 (diff) | |
| download | linux-48a2e88f53aea4dface64883157ad3c428132f75.tar.bz2 | |
uuid: Provide a GUID generator for raw buffer
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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/uuid.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/uuid.c b/lib/uuid.c index b6a1edb61d87..562d53977cab 100644 --- a/lib/uuid.c +++ b/lib/uuid.c @@ -40,6 +40,16 @@ void generate_random_uuid(unsigned char uuid[16]) } 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]) { prandom_bytes(b, 16); |