Re: [Qemu-devel] [PATCH V9 06/14] block: add check for VM snapshot in bdrv_query_snapshot_info_list()

[Eric Blake]

On 03/11/2013 05:23 AM, Wenchao Xia wrote:
>   This patch adds a parameter to tell whether return valid snapshots
> for whole VM only.
> 
> Signed-off-by: Wenchao Xia <address@hidden>
> ---
>  block/qapi.c         |   42 ++++++++++++++++++++++++++++++++++++++++--
>  include/block/qapi.h |    1 +
>  qemu-img.c           |    3 ++-
>  3 files changed, 43 insertions(+), 3 deletions(-)

> +    /* Check logic is connected with load_vmstate():
> +       Only check the devices that can snapshot, other devices that can't
> +       take snapshot, for example, readonly ones, will be ignored in
> +       load_vmstate(). */
> +    while ((bs1 = bdrv_next(bs1))) {
> +        if (bdrv_can_snapshot(bs1) && bs1 != bs) {

Minor optimization - you could rearrange the conjunct and check 'bs1 !=
bs' first, to avoid the overhead of bdrv_can_snapshot on bs.  But that
doesn't stop me from giving:

Reviewed-by: Eric Blake <address@hidden>

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

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