On Fri, Mar 20, 2020 at 02:35:44PM -0500, Eric Blake wrote:
> On 3/20/20 1:58 PM, Alberto Garcia wrote:
> > Hi,
> >
> > when full_discard is false in discard_in_l2_slice() then the selected
> > cluster should be deallocated and it should read back as zeroes. This
> > is done by clearing the cluste
On Fri 20 Mar 2020 08:35:44 PM CET, Eric Blake wrote:
>> This flag is however only supported when qcow_version >= 3. In older
>> images the cluster is simply deallocated, exposing any possible
>> previous data from the backing file.
>
> Discard is advisory, and has no requirements that discarded d
On 3/20/20 1:58 PM, Alberto Garcia wrote:
Hi,
when full_discard is false in discard_in_l2_slice() then the selected
cluster should be deallocated and it should read back as zeroes. This
is done by clearing the cluster offset field and setting OFLAG_ZERO in
the L2 entry.
This flag is however onl
