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Re: [Qemu-devel] [PATCH v3 2/2] mirror: fix improperly filled copy_bitma

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v3 2/2] mirror: fix improperly filled copy_bitmap for mirror block job
Date: Thu, 15 Sep 2016 12:19:20 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 09/15/2016 11:34 AM, Denis V. Lunev wrote:
> bdrv_is_allocated_above() returns true in the case even for completel


> zeroed areas as BDRV_BLOCK_ALLOCATED flag is set in both cases.
> The patch stops using bdrv_is_allocated_above() wrapper and switches to
> bdrv_get_block_status_above() to distinguish zeroed areas and areas with
> data to avoid extra IO operations if possible.
> Signed-off-by: Denis V. Lunev <address@hidden>
> CC: Stefan Hajnoczi <address@hidden>
> CC: Fam Zheng <address@hidden>
> CC: Kevin Wolf <address@hidden>
> CC: Max Reitz <address@hidden>
> CC: Jeff Cody <address@hidden>
> ---
>  block/mirror.c | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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