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> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> Reviewed-by: Eric Blake <ebl...@redhat.com> --- nbd/server.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/nbd/server.c b/nbd/server.c index fbd51b48a7..a1c73ce957 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1511,13 +1511,13 @@ 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_filtered_bs(bs); } if (bm == NULL) { -- 2.21.0