1 files changed, 44 insertions, 1 deletions

diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
index 7e93718086..69ddf289dd 100644
--- a/migration/block-dirty-bitmap.c
+++ b/migration/block-dirty-bitmap.c
@@ -319,14 +319,54 @@ static int init_dirty_bitmap_migration(void)
 {
     BlockDriverState *bs;
     DirtyBitmapMigBitmapState *dbms;
+    GHashTable *handled_by_blk = g_hash_table_new(NULL, NULL);
+    BlockBackend *blk;
 
     dirty_bitmap_mig_state.bulk_completed = false;
     dirty_bitmap_mig_state.prev_bs = NULL;
     dirty_bitmap_mig_state.prev_bitmap = NULL;
     dirty_bitmap_mig_state.no_bitmaps = false;
 
+    /*
+     * Use blockdevice name for direct (or filtered) children of named block
+     * backends.
+     */
+    for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
+        const char *name = blk_name(blk);
+
+        if (!name || strcmp(name, "") == 0) {
+            continue;
+        }
+
+        bs = blk_bs(blk);
+
+        /* Skip filters without bitmaps */
+        while (bs && bs->drv && bs->drv->is_filter &&
+               !bdrv_has_named_bitmaps(bs))
+        {
+            if (bs->backing) {
+                bs = bs->backing->bs;
+            } else if (bs->file) {
+                bs = bs->file->bs;
+            } else {
+                bs = NULL;
+            }
+        }
+
+        if (bs && bs->drv && !bs->drv->is_filter) {
+            if (add_bitmaps_to_list(bs, name)) {
+                goto fail;
+            }
+            g_hash_table_add(handled_by_blk, bs);
+        }
+    }
+
     for (bs = bdrv_next_all_states(NULL); bs; bs = bdrv_next_all_states(bs)) {
-        if (add_bitmaps_to_list(bs, bdrv_get_device_or_node_name(bs))) {
+        if (g_hash_table_contains(handled_by_blk, bs)) {
+            continue;
+        }
+
+        if (add_bitmaps_to_list(bs, bdrv_get_node_name(bs))) {
             goto fail;
         }
     }
@@ -340,9 +380,12 @@ static int init_dirty_bitmap_migration(void)
         dirty_bitmap_mig_state.no_bitmaps = true;
     }
 
+    g_hash_table_destroy(handled_by_blk);
+
     return 0;
 
 fail:
+    g_hash_table_destroy(handled_by_blk);
     dirty_bitmap_mig_cleanup();
 
     return -1;