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bcachefs: better __bch2_snapshot_is_ancestor() assert

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Previously, we weren't checking the result of the skiplist walk, just
the is_ancestor bitmap.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2025-06-13 15:17:37 -04:00
parent 425da82c63
commit f2ed089273
1 changed files with 5 additions and 3 deletions
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fs/bcachefs/snapshot.c
+5 -3
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@@ -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;
}