24.04.2020 15:17, Kevin Wolf wrote:
Am 24.04.2020 um 08:16 hat Vladimir Sementsov-Ogievskiy geschrieben:
23.04.2020 18:01, Kevin Wolf wrote:
If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
undo any previo
On 4/24/20 7:17 AM, Kevin Wolf wrote:
+ret = qcow2_co_pwritev_part(bs, old_length, qiov.size, &qiov, 0,
0);
Better not do it if this cluster is already ZERO.. But it may be a
later patch to improve that.
I doubt it's worth writing code to optimise a corner case inside a
corner
Am 24.04.2020 um 08:16 hat Vladimir Sementsov-Ogievskiy geschrieben:
> 23.04.2020 18:01, Kevin Wolf wrote:
> > If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
> > qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
> > undo any previous preallocation, but just
23.04.2020 18:01, Kevin Wolf wrote:
If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
undo any previous preallocation, but just adds the zero flag to all
relevant L2 entries. If an external data file is in us
Am 23.04.2020 um 17:18 hat Eric Blake geschrieben:
> On 4/23/20 10:01 AM, Kevin Wolf wrote:
> > If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
> > qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
> > undo any previous preallocation, but just adds the zero
On 4/23/20 10:01 AM, Kevin Wolf wrote:
If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
undo any previous preallocation, but just adds the zero flag to all
relevant L2 entries. If an external data file is in
If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
undo any previous preallocation, but just adds the zero flag to all
relevant L2 entries. If an external data file is in use, a write_zeroes
request to the data
