block: add bdrv_get_aio_context()

For now bdrv_get_aio_context() is just a stub that calls
qemu_aio_get_context() since the block layer is currently tied to the
main loop AioContext.

Add the stub now so that the block layer can begin accessing its
AioContext.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/block.c b/block.c
index 0ab164d992..037e15e065 100644
--- a/block.c
+++ b/block.c
@@ -4681,3 +4681,9 @@ out:
         bdrv_delete(bs);
     }
 }
+
+AioContext *bdrv_get_aio_context(BlockDriverState *bs)
+{
+    /* Currently BlockDriverState always uses the main loop AioContext */
+    return qemu_get_aio_context();
+}
diff --git a/include/block/block_int.h b/include/block/block_int.h
index baf80e3c42..ce0aa26b8e 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -294,6 +294,13 @@ int get_tmp_filename(char *filename, int size);
 void bdrv_set_io_limits(BlockDriverState *bs,
                         BlockIOLimit *io_limits);
 
+/**
+ * bdrv_get_aio_context:
+ *
+ * Returns: the currently bound #AioContext
+ */
+AioContext *bdrv_get_aio_context(BlockDriverState *bs);
+
 #ifdef _WIN32
 int is_windows_drive(const char *filename);
 #endif