block/backup: loosen restriction on readonly bitmaps

With the "never" sync policy, we actually can utilize readonly bitmaps
now. Loosen the check at the QMP level, and tighten it based on
provided arguments down at the job creation level instead.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190709232550.10724-19-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/blockdev.c b/blockdev.c
index 985b6cd75c..a44ab1f709 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3491,7 +3491,7 @@ static BlockJob *do_backup_common(BackupCommon *backup,
                        "when providing a bitmap");
             return NULL;
         }
-        if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) {
+        if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
             return NULL;
         }
     }