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Re: [Qemu-block] [PATCH 08/21] backup: skip unallocated clusters for ful
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-block] [PATCH 08/21] backup: skip unallocated clusters for full mode |
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Date: |
Tue, 31 Jan 2017 14:38:01 +0000 |
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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 !=
NEW_IMAGE_MODE_EXISTING.
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