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bcachefs: Fix subtraction underflow

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When ancestor is less than IS_ANCESTOR_BITMAP, we would get an incorrect
result.

Signed-off-by: Alan Huang <mmpgouride@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Alan Huang
2025-01-27 17:12:41 +08:00
committed by Kent Overstreet
parent f269ae55d2
commit 7d8321a286
1 changed files with 3 additions and 2 deletions
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5
fs/bcachefs/snapshot.c
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@@ -146,8 +146,9 @@ bool __bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
goto out;
}
while (id && id < ancestor - IS_ANCESTOR_BITMAP)
id = get_ancestor_below(t, id, ancestor);
if (likely(ancestor >= IS_ANCESTOR_BITMAP))
while (id && id < ancestor - IS_ANCESTOR_BITMAP)
id = get_ancestor_below(t, id, ancestor);
ret = id && id < ancestor
? test_ancestor_bitmap(t, id, ancestor)