[RFC PATCH 3/3] block: Assert we're running in the right thread

[Kevin Wolf <kwolf@redhat.com>]

tracked_request_begin() is called for most I/O operations, so it's a
good place to assert that we're indeed running in the home thread of the
node's AioContext.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/io.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/io.c b/block/io.c
index 7808e8bdc0..924bf5ba46 100644
--- a/block/io.c
+++ b/block/io.c
@@ -695,14 +695,17 @@ static void tracked_request_begin(BdrvTrackedRequest *req,
                                   uint64_t bytes,
                                   enum BdrvTrackedRequestType type)
 {
+    Coroutine *self = qemu_coroutine_self();
+
     assert(bytes <= INT64_MAX && offset <= INT64_MAX - bytes);
+    assert(bs->aio_context == qemu_coroutine_get_aio_context(self));
 
     *req = (BdrvTrackedRequest){
         .bs = bs,
         .offset         = offset,
         .bytes          = bytes,
         .type           = type,
-        .co             = qemu_coroutine_self(),
+        .co             = self,
         .serialising    = false,
         .overlap_offset = offset,
         .overlap_bytes  = bytes,
-- 
2.25.3