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Re: [Qemu-devel] [PATCH 01/21] backup: move from done_bitmap to copy_bit
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] [PATCH 01/21] backup: move from done_bitmap to copy_bitmap |
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Date: |
Tue, 31 Jan 2017 10:25:00 +0000 |
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User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Fri, Dec 23, 2016 at 05:28:44PM +0300, Vladimir Sementsov-Ogievskiy wrote:
> Use HBitmap copy_bitmap instead of done_bitmap. This is needed to unify
> backup loop for full/incremental modes in future patches.
>
> We reset bit of the copy_bitmap immediately after checking it in
> backup_do_cow(). It is safe, because all other intersecting requests
> will wait for our request finish anyway.
>
> The other difference is that in case of error we will have zeroed bit in
> copy_bitmap, when in done_bitmap we have not set bit.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> ---
> block/backup.c | 17 ++++++++++-------
> 1 file changed, 10 insertions(+), 7 deletions(-)
Reviewed-by: Stefan Hajnoczi <address@hidden>
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