[12/22] quorum: implement .bdrv_detach/attach_aio_context()

Implement .bdrv_detach/attach_aio_context() interfaces to propagate
detach/attach to BDRVQuorumState->bs[] children.  The block layer takes
care of ->file and ->backing_hd but doesn't know about our ->bs[]
BlockDriverStates, which is also part of the graph.

Cc: Benoît Canet <benoit.canet@irqsave.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/quorum.c | 48 ++++++++++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 12 deletions(-)

The Thursday 01 May 2014 à 16:54:36 (+0200), Stefan Hajnoczi wrote :
> Implement .bdrv_detach/attach_aio_context() interfaces to propagate
> detach/attach to BDRVQuorumState->bs[] children.  The block layer takes
> care of ->file and ->backing_hd but doesn't know about our ->bs[]
> BlockDriverStates, which is also part of the graph.
> 
> Cc: Benoît Canet <benoit.canet@irqsave.net>
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  block/quorum.c | 48 ++++++++++++++++++++++++++++++++++++------------
>  1 file changed, 36 insertions(+), 12 deletions(-)
> 
> diff --git a/block/quorum.c b/block/quorum.c
> index ecec3a5..426077a 100644
> --- a/block/quorum.c
> +++ b/block/quorum.c
> @@ -848,25 +848,49 @@ static void quorum_close(BlockDriverState *bs)
>      g_free(s->bs);
>  }
>  
> +static void quorum_detach_aio_context(BlockDriverState *bs)
> +{
> +    BDRVQuorumState *s = bs->opaque;
> +    int i;
> +
> +    for (i = 0; i < s->num_children; i++) {
> +        bdrv_detach_aio_context(s->bs[i]);
> +    }
> +}
> +
> +static void quorum_attach_aio_context(BlockDriverState *bs,
> +                                      AioContext *new_context)
> +{
> +    BDRVQuorumState *s = bs->opaque;
> +    int i;
> +
> +    for (i = 0; i < s->num_children; i++) {
> +        bdrv_attach_aio_context(s->bs[i], new_context);
> +    }
> +}
> +
>  static BlockDriver bdrv_quorum = {
> -    .format_name        = "quorum",
> -    .protocol_name      = "quorum",
> +    .format_name                        = "quorum",
> +    .protocol_name                      = "quorum",
> +
> +    .instance_size                      = sizeof(BDRVQuorumState),
>  
> -    .instance_size      = sizeof(BDRVQuorumState),
> +    .bdrv_file_open                     = quorum_open,
> +    .bdrv_close                         = quorum_close,
>  
> -    .bdrv_file_open     = quorum_open,
> -    .bdrv_close         = quorum_close,
> +    .bdrv_co_flush_to_disk              = quorum_co_flush,
>  
> -    .bdrv_co_flush_to_disk = quorum_co_flush,
> +    .bdrv_getlength                     = quorum_getlength,
>  
> -    .bdrv_getlength     = quorum_getlength,
> +    .bdrv_aio_readv                     = quorum_aio_readv,
> +    .bdrv_aio_writev                    = quorum_aio_writev,
> +    .bdrv_invalidate_cache              = quorum_invalidate_cache,
>  
> -    .bdrv_aio_readv     = quorum_aio_readv,
> -    .bdrv_aio_writev    = quorum_aio_writev,
> -    .bdrv_invalidate_cache = quorum_invalidate_cache,
> +    .bdrv_detach_aio_context            = quorum_detach_aio_context,
> +    .bdrv_attach_aio_context            = quorum_attach_aio_context,
>  
> -    .is_filter           = true,
> -    .bdrv_recurse_is_first_non_filter = quorum_recurse_is_first_non_filter,
> +    .is_filter                          = true,
> +    .bdrv_recurse_is_first_non_filter   = quorum_recurse_is_first_non_filter,
>  };
>  
>  static void bdrv_quorum_init(void)
> -- 
> 1.9.0
> 
Look good

Reviewed-by: Benoit Canet <benoit@irqsave.net>