[PATCH v3 7/7] migration/block-dirty-bitmap: forbid migration by generated node-name

[Vladimir Sementsov-Ogievskiy]

It actually never worked with libvirt, as auto-generated names are
different on source and destination.

It's unsafe and useless to migrate by auto-generated node-names, so
let's forbid it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
Reviewed-by: Andrey Shinkevich <address@hidden>
---
 migration/block-dirty-bitmap.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
index e0e081ce60..f5744c35e6 100644
--- a/migration/block-dirty-bitmap.c
+++ b/migration/block-dirty-bitmap.c
@@ -285,6 +285,13 @@ static int add_bitmaps_to_list(BlockDriverState *bs, const 
char *bs_name)
         return -1;
     }
 
+    if (bs_name[0] == '#') {
+        error_report("Found bitmap '%s' in a node with auto-generated "
+                     "name: %s. It can't be migrated",
+                     bdrv_dirty_bitmap_name(bitmap), bs_name);
+        return -1;
+    }
+
     FOR_EACH_DIRTY_BITMAP(bs, bitmap) {
         if (!bdrv_dirty_bitmap_name(bitmap)) {
             continue;
-- 
2.21.0