Re: Btrfs and raw zvol-like partition

["Sébastien Wacquiez" <sw@enix.org>]

Andrey Kuzmin a =C3=A9crit :
> zvol (interface) does not just  'export raw device' but rather
> implements volume  abstraction and integrates volume management into
> file-system.
>  =20
Yep. I suck at writing english, thanks for pointing that out :)

I surely mislead myself, but I think that the "volume management" of ZF=
S=20
could be done with file.

Alloc on write ? Use sparse file. Resizing ? Append or truncate the=20
file. Snapshot ? Snapshot the file. Another Volume ? An other file :)

In fact, the two thinks that have to be done, for me, is :
 1/ Optimise the different layer to bypass permission, acl, & co, and=20
surely the way data is written.
 2/ Be able to export those file directly as block device. (Allowing=20
some more optimisation :) )

It's why I called this feature "export raw device" (as in "export raw=20
file as block device"). As I say, it could be emulated with file and=20
loopback, but it'll surely be slow ... So I wanna know if btrfs plan to=
=20
have those type of optimization (and the user land tools to simplify=20
it's management).


Regards,


S=C3=A9bastien Wacquiez
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