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Re: [Qemu-devel] [PATCH 2/3] block/backup: disable copy_range for compre


From: John Snow
Subject: Re: [Qemu-devel] [PATCH 2/3] block/backup: disable copy_range for compressed backup
Date: Tue, 30 Jul 2019 14:22:37 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0


On 7/30/19 12:32 PM, Vladimir Sementsov-Ogievskiy wrote:
> Enabled by default copy_range ignores compress option. It's definitely
> unexpected for user.
> 
> It's broken since introduction of copy_range usage in backup in
> 9ded4a011496.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> ---
>  block/backup.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/block/backup.c b/block/backup.c
> index f4aaf08df3..c5f941101a 100644
> --- a/block/backup.c
> +++ b/block/backup.c
> @@ -645,7 +645,7 @@ BlockJob *backup_job_create(const char *job_id, 
> BlockDriverState *bs,
>      job->cluster_size = cluster_size;
>      job->copy_bitmap = copy_bitmap;
>      copy_bitmap = NULL;
> -    job->use_copy_range = true;
> +    job->use_copy_range = !compress; /* compression isn't supported for it */
>      job->copy_range_size = 
> MIN_NON_ZERO(blk_get_max_transfer(job->common.blk),
>                                          blk_get_max_transfer(job->target));
>      job->copy_range_size = MAX(job->cluster_size,
> 

Agree, these aren't compatible options. Is this worth a note in
docs/interop/live-block-operations.rst?

Reviewed-by: John Snow <address@hidden>



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