[PULL 07/10] mirror: Move open_backing_file to exit_common

[Kevin Wolf <kwolf@redhat.com>]

From: Max Reitz <mreitz@redhat.com>

This is a graph change and therefore should be done in job-finalize
(which is what invokes mirror_exit_common()).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20210409120422.144040-2-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/mirror.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index d7e54c0ff7..f1f936bf1a 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -689,6 +689,14 @@ static int mirror_exit_common(Job *job)
                 ret = -EPERM;
             }
         }
+    } else if (!abort && s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) {
+        assert(!bdrv_backing_chain_next(target_bs));
+        ret = bdrv_open_backing_file(bdrv_skip_filters(target_bs), NULL,
+                                     "backing", &local_err);
+        if (ret < 0) {
+            error_report_err(local_err);
+            local_err = NULL;
+        }
     }
 
     if (s->to_replace) {
@@ -1107,9 +1115,6 @@ immediate_exit:
 static void mirror_complete(Job *job, Error **errp)
 {
     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
-    BlockDriverState *target;
-
-    target = blk_bs(s->target);
 
     if (!s->synced) {
         error_setg(errp, "The active block job '%s' cannot be completed",
@@ -1117,17 +1122,6 @@ static void mirror_complete(Job *job, Error **errp)
         return;
     }
 
-    if (s->backing_mode == MIRROR_OPEN_BACKING_CHAIN) {
-        int ret;
-
-        assert(!bdrv_backing_chain_next(target));
-        ret = bdrv_open_backing_file(bdrv_skip_filters(target), NULL,
-                                     "backing", errp);
-        if (ret < 0) {
-            return;
-        }
-    }
-
     /* block all operations on to_replace bs */
     if (s->replaces) {
         AioContext *replace_aio_context;
-- 
2.30.2