[RFC PATCH v2 18/25] block/coroutines: I/O API

[Emanuele Giuseppe Esposito <eesposit@redhat.com>]

block coroutines functions run in different aiocontext, and are
not protected by the BQL. Therefore are I/O.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
 block/coroutines.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/block/coroutines.h b/block/coroutines.h
index 514d169d23..105e0ce2a9 100644
--- a/block/coroutines.h
+++ b/block/coroutines.h
@@ -27,6 +27,12 @@
 
 #include "block/block_int.h"
 
+/*
+ * I/O API functions. These functions are thread-safe, and therefore
+ * can run in any thread as long as they have called
+ * aio_context_acquire/release().
+ */
+
 int coroutine_fn bdrv_co_check(BlockDriverState *bs,
                                BdrvCheckResult *res, BdrvCheckMode fix);
 int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp);
-- 
2.27.0