Re: Btrfs and raw zvol-like partition

[Chris Mason <chris.mason@oracle.com>]

On Sun, 2009-04-12 at 09:26 +0200, S=C3=A9bastien Wacquiez wrote:
> Hi,
>=20
> A nice feature is ZFS is the "ZVOL" layer, that permit you to export=20
> (directly) a raw device from your zfs pool of disc, with the benefit =
of=20
> powerful (growing!) snapshot and easy raid management from zfs. It's=20
> particulary usefull when you use it with virtual server, allowing you=
 to=20
> centralize all your backup problematic, etc
>=20
> Does btrfs plan to support this kind of feature ? (please, don't tell=
 me=20
> that lvm do, lvm just sucks when you make a snapshot of your disk, an=
d=20
> lack of the "growing", commit, rollback, diffsend feature).
>=20

I've always been interested in a btrfs export via loop or dm.  The
problem with loop is that it needs to be switched over to O_DIRECT or
something similar.

At any rate, it would be a fun project for someone looking to know dm
better.

-chris


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