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Re: [Qemu-devel] [PATCH 08/21] backup: skip unallocated clusters for ful

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH 08/21] backup: skip unallocated clusters for full mode
Date: Tue, 31 Jan 2017 14:38:01 +0000
User-agent: Mutt/1.7.1 (2016-10-04)

On Fri, Dec 23, 2016 at 05:28:51PM +0300, Vladimir Sementsov-Ogievskiy wrote:
> +            if (is_top || bdrv_has_zero_init(blk_bs(job->target))) {

   * Returns 1 if newly created images are guaranteed to contain
   * only zeros, 0 otherwise.
  int (*bdrv_has_zero_init)(BlockDriverState *bs);

This function does not cover arbitrary images opened with bdrv_open(),
only those created with bdrv_img_create() immediately before opening.

This means that the check is only valid with backup->mode !=

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