On 04/25/2018 11:15 AM, Peter Krempa wrote:
> Enabling discard for the storage node allows the format drivers to
> discard snapshots and other things, while configuration of the format
> layer actually decides whether to actually discard data on request from
> the host.
>
> Signed-off-by: Peter Krempa <[email protected]>
> ---
> src/qemu/qemu_block.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
Isn't this related to the {disk|src}->discard value? Which we copied
from patch 3.
So you'd just be unconditionally setting here regardless of what was
configured?
John
> diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
> index b1f495b731..6e76571796 100644
> --- a/src/qemu/qemu_block.c
> +++ b/src/qemu/qemu_block.c
> @@ -1163,7 +1163,10 @@
> qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src,
> if (qemuBlockStorageSourceGetBlockdevGetCacheProps(src, fileprops) <
> 0)
> goto cleanup;
>
> - if (virJSONValueObjectAdd(fileprops, "b:read-only", src->readonly,
> NULL) < 0)
> + if (virJSONValueObjectAdd(fileprops,
> + "b:read-only", src->readonly,
> + "s:discard", "unmap",
> + NULL) < 0)
> goto cleanup;
> }
>
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