[PATCH v3 10/16] block/export: Don't ignore image activation error in blk_exp_add()

[Kevin Wolf]

Currently, block exports can't handle inactive images correctly.
Incoming write requests would run into assertion failures. Make sure
that we return an error when creating an export can't activate the
image.

Signed-off-by: Kevin Wolf <kw...@redhat.com>
Acked-by: Fabiano Rosas <faro...@suse.de>
Reviewed-by: Eric Blake <ebl...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
 block/export/export.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/block/export/export.c b/block/export/export.c
index 79c71ee245..bac42b8608 100644
--- a/block/export/export.c
+++ b/block/export/export.c
@@ -145,7 +145,11 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Error 
**errp)
      * ctx was acquired in the caller.
      */
     bdrv_graph_rdlock_main_loop();
-    bdrv_activate(bs, NULL);
+    ret = bdrv_activate(bs, errp);
+    if (ret < 0) {
+        bdrv_graph_rdunlock_main_loop();
+        goto fail;
+    }
     bdrv_graph_rdunlock_main_loop();
 
     perm = BLK_PERM_CONSISTENT_READ;
-- 
2.48.1