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-rw-r--r--include/block/block.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h
index 1027c58a41..d16c401cb4 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -658,6 +658,20 @@ AioContext *coroutine_fn bdrv_co_enter(BlockDriverState *bs);
void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx);
/**
+ * Locks the AioContext of @bs if it's not the current AioContext. This avoids
+ * double locking which could lead to deadlocks: This is a coroutine_fn, so we
+ * know we already own the lock of the current AioContext.
+ *
+ * May only be called in the main thread.
+ */
+void coroutine_fn bdrv_co_lock(BlockDriverState *bs);
+
+/**
+ * Unlocks the AioContext of @bs if it's not the current AioContext.
+ */
+void coroutine_fn bdrv_co_unlock(BlockDriverState *bs);
+
+/**
* Transfer control to @co in the aio context of @bs
*/
void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co);