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| author | David Howells <dhowells@redhat.com> | 2017-02-10 16:34:07 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2017-02-10 16:34:17 +0000 |
| commit | ff548773106ec7f8031bc6172e0234bd2a02c19c (patch) | |
| tree | 1bae4bf8247b6e556f03d4a13274666eb1ea620b /include/linux/uuid.h | |
| parent | a507c346b7fdc97296fa74626df49fdb7296a04e (diff) | |
| download | lwn-ff548773106ec7f8031bc6172e0234bd2a02c19c.tar.gz lwn-ff548773106ec7f8031bc6172e0234bd2a02c19c.zip | |
afs: Move UUID struct to linux/uuid.h
Move the afs_uuid struct to linux/uuid.h, rename it to uuid_v1 and change
the u16/u32 fields to __be16/__be32 instead so that the structure can be
cast to a 16-octet network-order buffer.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de
Diffstat (limited to 'include/linux/uuid.h')
| -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. */ |