[PATCH v7 36/47] nbd: Use CAF when looking for dirty bitmap

[Max Reitz]

When looking for a dirty bitmap to share, we should handle filters by
just including them in the search (so they do not break backing chains).

Signed-off-by: Max Reitz <mre...@redhat.com>
---
 nbd/server.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/nbd/server.c b/nbd/server.c
index 20754e9ebc..b504a79435 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1561,13 +1561,13 @@ NBDExport *nbd_export_new(BlockDriverState *bs, 
uint64_t dev_offset,
     if (bitmap) {
         BdrvDirtyBitmap *bm = NULL;
 
-        while (true) {
+        while (bs) {
             bm = bdrv_find_dirty_bitmap(bs, bitmap);
-            if (bm != NULL || bs->backing == NULL) {
+            if (bm != NULL) {
                 break;
             }
 
-            bs = bs->backing->bs;
+            bs = bdrv_filter_or_cow_bs(bs);
         }
 
         if (bm == NULL) {
-- 
2.26.2