block: Drop permissions when migration completes

With image locking, permissions affect other qemu processes as well. We
want to be sure that the destination can run, so let's drop permissions
on the source when migration completes.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/block/block_int.h b/include/block/block_int.h
index 563792580c..5750a448a6 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -473,10 +473,11 @@ struct BdrvChildRole {
     void (*drained_begin)(BdrvChild *child);
     void (*drained_end)(BdrvChild *child);
 
-    /* Notifies the parent that the child has been activated (e.g. when
-     * migration is completing) and it can start requesting permissions and
-     * doing I/O on it. */
+    /* Notifies the parent that the child has been activated/inactivated (e.g.
+     * when migration is completing) and it can start/stop requesting
+     * permissions and doing I/O on it. */
     void (*activate)(BdrvChild *child, Error **errp);
+    int (*inactivate)(BdrvChild *child);
 
     void (*attach)(BdrvChild *child);
     void (*detach)(BdrvChild *child);