diff options
| author | David S. Miller | 2017-02-13 22:24:16 -0500 |
|---|---|---|
| committer | David S. Miller | 2017-02-13 22:24:16 -0500 |
| commit | c3d8103bc0069b926887e2270e9dd1e1e8441bb4 (patch) | |
| tree | b4a75bc36c12c1c16fd52519849b4be22b0e2d85 /include/linux | |
| parent | fb585b44383c4cff85f92e67377ee1c5f07d6dc1 (diff) | |
| parent | b4db2b35fc444409daf483006111a2a705550fff (diff) | |
Merge tag 'rxrpc-rewrite-20170210' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
David Howells says:
====================
afs: Use system UUID generation
There is now a general function for generating a UUID and AFS should make
use of it. It's also been recommended to me that I switch to using random
rather than time plus MAC address-based UUIDs which this function does.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/uuid.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/uuid.h b/include/linux/uuid.h index 2d095fc60204..4dff73a89758 100644 --- a/include/linux/uuid.h +++ b/include/linux/uuid.h @@ -19,6 +19,30 @@ #include <uapi/linux/uuid.h> /* + * V1 (time-based) UUID definition [RFC 4122]. + * - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns + * increments since midnight 15th October 1582 + * - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID + * time + * - the clock sequence is a 14-bit counter to avoid duplicate times + */ +struct uuid_v1 { + __be32 time_low; /* low part of timestamp */ + __be16 time_mid; /* mid part of timestamp */ + __be16 time_hi_and_version; /* high part of timestamp and version */ +#define UUID_TO_UNIX_TIME 0x01b21dd213814000ULL +#define UUID_TIMEHI_MASK 0x0fff +#define UUID_VERSION_TIME 0x1000 /* time-based UUID */ +#define UUID_VERSION_NAME 0x3000 /* name-based UUID */ +#define UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */ + u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */ +#define UUID_CLOCKHI_MASK 0x3f +#define UUID_VARIANT_STD 0x80 + u8 clock_seq_low; /* clock seq low */ + u8 node[6]; /* spatially unique node ID (MAC addr) */ +}; + +/* * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee") * not including trailing NUL. */ |