Now that all BB users comply with the BLK_PERM_AIO_CONTEXT_CHANGE
rule, we can assert it.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/block-backend.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/block-backend.c b/block/block-backend.c
index ec8747f..8284b83 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1623,8 +1623,12 @@ static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb)
 
 void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
 {
+    uint64_t perm, shared_perm;
     BlockDriverState *bs = blk_bs(blk);
 
+    blk_get_perm(blk, &perm, &shared_perm);
+    assert(perm & BLK_PERM_AIO_CONTEXT_CHANGE);
+
     blk->aio_context = new_context;
     if (bs) {
         if (blk->public.throttle_state) {
-- 
2.9.3