diff options
| author | David Sterba <dsterba@suse.com> | 2021-10-22 16:53:36 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-10-29 12:38:43 +0200 |
| commit | e77fbf990316d47968a793d8aa920fd62385aec9 (patch) | |
| tree | f8bfc770245ccc649b54a16a5d976d64da2986cc /fs/btrfs/send.h | |
| parent | 50780d9baa316fa773137d1802005932e9bae215 (diff) | |
btrfs: send: prepare for v2 protocol
This is preparatory work for send protocol update to version 2 and
higher.
We have many pending protocol update requests but still don't have the
basic protocol rev in place, the first thing that must happen is to do
the actual versioning support.
The protocol version is u32 and is a new member in the send ioctl
struct. Validity of the version field is backed by a new flag bit. Old
kernels would fail when a higher version is requested. Version protocol
0 will pick the highest supported version, BTRFS_SEND_STREAM_VERSION,
that's also exported in sysfs.
The version is still unchanged and will be increased once we have new
incompatible commands or stream updates.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/send.h')
| -rw-r--r-- | fs/btrfs/send.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h index de91488b7cd0..23bcefc84e49 100644 --- a/fs/btrfs/send.h +++ b/fs/btrfs/send.h @@ -48,6 +48,7 @@ struct btrfs_tlv_header { enum btrfs_send_cmd { BTRFS_SEND_C_UNSPEC, + /* Version 1 */ BTRFS_SEND_C_SUBVOL, BTRFS_SEND_C_SNAPSHOT, @@ -76,6 +77,12 @@ enum btrfs_send_cmd { BTRFS_SEND_C_END, BTRFS_SEND_C_UPDATE_EXTENT, + __BTRFS_SEND_C_MAX_V1, + + /* Version 2 */ + __BTRFS_SEND_C_MAX_V2, + + /* End */ __BTRFS_SEND_C_MAX, }; #define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1) |