Re: [PATCH v2 9/9] block: drop unallocated_blocks_are_zero

[Eric Blake]

On 5/7/20 3:48 AM, Vladimir Sementsov-Ogievskiy wrote:
> Currently this field only set by qed and qcow2. But in fact, all
> backing-supporting formats (parallels, qcow, qcow2, qed, vmdk) share
> these semantics: on unallocated blocks, if there is no backing file they
> just memset the buffer with zeroes.
>
> So, document this behavior for .supports_backing and drop
> .unallocated_blocks_are_zero
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> ---
>   include/block/block.h     |  5 -----
>   include/block/block_int.h | 12 +++++++++++-
>   block/io.c                |  9 ++-------
>   block/qcow2.c             |  1 -
>   block/qed.c               |  1 -
>   5 files changed, 13 insertions(+), 15 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
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