[Btrfs-devel] transaction ioctls

[Evgeniy Polyakov]

Hi Chris.

On Wed, Apr 23, 2008 at 08:50:54AM -0400, Chris Mason (chris.mason at oracle.com) wrote:
> Transaction rollback from a filesystem point of view is a reboot.  Real 
> database style transactions with rollback and isolation from other procs etc 
> etc are outside the scope of Btrfs.

Why rollback is a reboot? With copy-on-write it could be possible to
just commit tree state, which was before transaction start, as a current
one and thus rollback all changes. Having that possibility from
userspace could be a great benefit, since in case of application error
it is relly simple to undo all changes.

-- 
	Evgeniy Polyakov