On 03/03/2015 01:13 PM, Max Reitz wrote:
> When bdrv_close_all() is called, instead of force-closing all root
> BlockDriverStates, it is better to just drop the reference from all
> BlockBackends and let them be closed automatically. This prevents BDS
> from getting closed that are still referenced by other BDS, which may
> result in loss of cached data.
> 
> This patch adds a function for doing that, but does not yet incorporate
> it in bdrv_close_all().
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  block/block-backend.c          | 13 +++++++++++++
>  include/sysemu/block-backend.h |  1 +
>  2 files changed, 14 insertions(+)

Reviewed-by: Eric Blake <eblake@redhat.com>

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