On Tue, Jan 18, 2022 at 05:59:59PM +0100, Hanna Reitz wrote:
> We update the block-status cache whenever we get new information from a
> bdrv_co_block_status() call to the block driver. However, if we have
> passed want_zero=false to that call, it may flag areas containing zeroes
> as data, and so we would update the block-status cache with wrong
> information.
>
> Therefore, we should not update the cache with want_zero=false.
>
> Reported-by: Nir Soffer <nsof...@redhat.com>
> Fixes: 0bc329fbb00 ("block: block-status cache for data regions")
> Reviewed-by: Nir Soffer <nsof...@redhat.com>
> Cc: qemu-sta...@nongnu.org
> Signed-off-by: Hanna Reitz <hre...@redhat.com>
> ---
> block/io.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
Reviewed-by: Eric Blake <ebl...@redhat.com>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
