Re: [PATCH 1/4] Btrfs: send, bump stream version

[Filipe David Manana <fdmanana@gmail.com>]

On Tue, Apr 15, 2014 at 6:28 PM, Mark Fasheh <mfasheh@suse.de> wrote:
> On Tue, Apr 15, 2014 at 05:40:18PM +0100, Filipe David Borba Manana wrote:
>> This increases the send stream version from version 1 to version 2, adding
>> 2 new commands:
>>
>> 1) total data size - used to tell the receiver how much file data the stream
>>    will add or update;
>>
>> 2) fallocate - used to pre-allocate space for files and to punch holes in files.
>>
>> This is preparation work for subsequent changes that implement the new features
>> (computing total data size and use fallocate for better performance).
>
> Are these changes compatible with software using the old stream version? We
> have snapshotting tools that are using send/recieve and it would be bad to
> change the ABI in incompatible ways underneath them.
>         --Mark

New versions of btrfs-progs (send stream v2 support) will still be
able to read and process v1 streams. Older btrfs-progs (v1 only) won't
be able to process the new commands.
Does this answers your question Mark?


>
> --
> Mark Fasheh



-- 
Filipe David Manana,

"Reasonable men adapt themselves to the world.
 Unreasonable men adapt the world to themselves.
 That's why all progress depends on unreasonable men."