The intermediate nodes do work with aio context change, so allow that
operations.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/commit.c | 3 ++-
 block/mirror.c | 3 ++-
 block/stream.c | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/block/commit.c b/block/commit.c
index 76a0d98..e2ee0ff 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -365,7 +365,8 @@ void commit_start(const char *job_id, BlockDriverState *bs,
          * for its backing file). The other options would be a second filter
          * driver above s->base. */
         ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
-                                 BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE,
+                                 BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE |
+                                 BLK_PERM_AIO_CONTEXT_CHANGE,
                                  errp);
         if (ret < 0) {
             goto fail;
diff --git a/block/mirror.c b/block/mirror.c
index e86f8f8..03e82eb 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1232,7 +1232,8 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
              * also blocked for its backing file). The other options would be a
              * second filter driver above s->base (== target). */
             ret = block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
-                                     BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE,
+                                     BLK_PERM_WRITE_UNCHANGED | BLK_PERM_WRITE |
+                                     BLK_PERM_AIO_CONTEXT_CHANGE,
                                      errp);
             if (ret < 0) {
                 goto fail;
diff --git a/block/stream.c b/block/stream.c
index 0113710..2fab1f4 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -265,7 +265,8 @@ void stream_start(const char *job_id, BlockDriverState *bs,
      * and resizes. */
     for (iter = backing_bs(bs); iter && iter != base; iter = backing_bs(iter)) {
         block_job_add_bdrv(&s->common, "intermediate node", iter, 0,
-                           BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED,
+                           BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
+                           BLK_PERM_AIO_CONTEXT_CHANGE,
                            &error_abort);
     }
 
-- 
2.9.4