From f2ed0892732d470abde7a1af360bd670dc8a68c6 Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Fri, 13 Jun 2025 15:17:37 -0400 Subject: [PATCH] bcachefs: better __bch2_snapshot_is_ancestor() assert Previously, we weren't checking the result of the skiplist walk, just the is_ancestor bitmap. Signed-off-by: Kent Overstreet --- fs/bcachefs/snapshot.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/fs/bcachefs/snapshot.c b/fs/bcachefs/snapshot.c index 23a332d76b32..38aeaa128d27 100644 --- a/fs/bcachefs/snapshot.c +++ b/fs/bcachefs/snapshot.c @@ -135,7 +135,9 @@ static bool test_ancestor_bitmap(struct snapshot_table *t, u32 id, u32 ancestor) bool __bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor) { - bool ret; +#ifdef CONFIG_BCACHEFS_DEBUG + u32 orig_id = id; +#endif guard(rcu)(); struct snapshot_table *t = rcu_dereference(c->snapshots); @@ -147,11 +149,11 @@ bool __bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor) while (id && id < ancestor - IS_ANCESTOR_BITMAP) id = get_ancestor_below(t, id, ancestor); - ret = id && id < ancestor + bool ret = id && id < ancestor ? test_ancestor_bitmap(t, id, ancestor) : id == ancestor; - EBUG_ON(ret != __bch2_snapshot_is_ancestor_early(t, id, ancestor)); + EBUG_ON(ret != __bch2_snapshot_is_ancestor_early(t, orig_id, ancestor)); return ret; } -- 2.25.1