[dm-devel] Re: [PATCH 1 of 2] DM Exception Store: return zero when empty

[Alasdair G Kergon <agk redhat com>]

On Wed, Sep 23, 2009 at 10:24:58AM -0500, Jon Brassow wrote:
> When the snapshot is empty, return 0 as the number of allocated sectors.
> This will be needed to properly notify userspace that merging is finished.

A kernel/userspace interface change and visible to the user in their tools.
Needs discussion.
 
Alasdair