Re: [Qemu-devel] [PATCH v7 19/24] block: Add list of all BlockDriverStates

[Fam Zheng <famz@redhat.com>]

On Mon, 11/09 23:39, Max Reitz wrote:
> We need this list so that bdrv_close_all() can keep track of which BDSs
> are still open after having removed the BDSs from all of the BBs and
> having released all monitor BDS references.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> Reviewed-by: Kevin Wolf <kwolf@redhat.com>

Reviewed-by: Fam Zheng <famz@redhat.com>

Is graph_bdrv_states becoming a subset of this list, just with non-empty
node_name?

> ---
>  block.c                   | 7 +++++++
>  include/block/block_int.h | 2 ++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/block.c b/block.c
> index b5874aa..b935dff 100644
> --- a/block.c
> +++ b/block.c
> @@ -78,6 +78,9 @@ struct BdrvStates bdrv_states = QTAILQ_HEAD_INITIALIZER(bdrv_states);
>  static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states =
>      QTAILQ_HEAD_INITIALIZER(graph_bdrv_states);
>  
> +static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states =
> +    QTAILQ_HEAD_INITIALIZER(all_bdrv_states);
> +
>  static QLIST_HEAD(, BlockDriver) bdrv_drivers =
>      QLIST_HEAD_INITIALIZER(bdrv_drivers);
>  
> @@ -266,6 +269,8 @@ BlockDriverState *bdrv_new(void)
>      bs->refcnt = 1;
>      bs->aio_context = qemu_get_aio_context();
>  
> +    QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list);
> +
>      return bs;
>  }
>  
> @@ -2128,6 +2133,8 @@ static void bdrv_delete(BlockDriverState *bs)
>      /* remove from list, if necessary */
>      bdrv_make_anon(bs);
>  
> +    QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list);
> +
>      g_free(bs);
>  }
>  
> diff --git a/include/block/block_int.h b/include/block/block_int.h
> index 617994d..8c82747 100644
> --- a/include/block/block_int.h
> +++ b/include/block/block_int.h
> @@ -422,6 +422,8 @@ struct BlockDriverState {
>      QTAILQ_ENTRY(BlockDriverState) node_list;
>      /* element of the list of "drives" the guest sees */
>      QTAILQ_ENTRY(BlockDriverState) device_list;
> +    /* element of the list of all BlockDriverStates (all_bdrv_states) */
> +    QTAILQ_ENTRY(BlockDriverState) bs_list;
>      QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
>      int refcnt;
>  
> -- 
> 2.6.2
> 
>