Re: [Qemu-devel] [RFC PATCH 09/14] block: give backing image its own BlockBackend

[Max Reitz]

On 2015-02-11 at 22:07, Wen Congyang wrote:
> Signed-off-by: Wen Congyang <address@hidden>
> Signed-off-by: zhanghailiang <address@hidden>
> Signed-off-by: Gonglei <address@hidden>
> ---
>   block.c | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)

Our current stance on BlockBackends is (as far as I know, anyway) that a 
BlockBackend always comes with a user. In case you're creating a 
BlockBackend through -drive or blockdev-add, the user is the monitor 
(which can use it to attach it to a device, for instance). In this case, 
there is no user and nobody holds a reference to the BB (other than the 
BDS, but that doesn't count).

Therefore, this patch doesn't look quite right.

Max