block: Rename BlockDriverAIOCB* to BlockAIOCB*

I'll use BlockDriverAIOCB with block backends shortly, and the name is
going to fit badly there.  It's a block layer thing anyway, not just a
block driver thing.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/thread-pool.c b/thread-pool.c
index 86fa4a8..70ebb50 100644
--- a/thread-pool.c
+++ b/thread-pool.c
@@ -34,7 +34,7 @@
 };
 
 struct ThreadPoolElement {
-    BlockDriverAIOCB common;
+    BlockAIOCB common;
     ThreadPool *pool;
     ThreadPoolFunc *func;
     void *arg;
@@ -195,7 +195,7 @@
     }
 }
 
-static void thread_pool_cancel(BlockDriverAIOCB *acb)
+static void thread_pool_cancel(BlockAIOCB *acb)
 {
     ThreadPoolElement *elem = (ThreadPoolElement *)acb;
     ThreadPool *pool = elem->pool;
@@ -220,7 +220,7 @@
     qemu_mutex_unlock(&pool->lock);
 }
 
-static AioContext *thread_pool_get_aio_context(BlockDriverAIOCB *acb)
+static AioContext *thread_pool_get_aio_context(BlockAIOCB *acb)
 {
     ThreadPoolElement *elem = (ThreadPoolElement *)acb;
     ThreadPool *pool = elem->pool;
@@ -233,7 +233,7 @@
     .get_aio_context    = thread_pool_get_aio_context,
 };
 
-BlockDriverAIOCB *thread_pool_submit_aio(ThreadPool *pool,
+BlockAIOCB *thread_pool_submit_aio(ThreadPool *pool,
         ThreadPoolFunc *func, void *arg,
         BlockDriverCompletionFunc *cb, void *opaque)
 {