On Fri, Apr 05, 2019 at 05:24:04PM +0300, Andrey Shinkevich wrote:
> On a file system used by the customer, fallocate() returns an error
> if the block is not properly aligned. So, bdrv_co_pwrite_zeroes()
> fails. We can handle that case the same way as it is done for the
> unsupported cases, namely, call to bdrv_driver_pwritev() that writes
> zeroes to an image for the unaligned chunk of the block.
> 
> Suggested-by: Denis V. Lunev <den@openvz.org>
> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
> ---
>  block/io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Thanks, applied to my block-next tree for QEMU 4.1:
https://github.com/stefanha/qemu/commits/block-next

Stefan