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-rw-r--r--libbcachefs/btree_update_interior.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libbcachefs/btree_update_interior.h b/libbcachefs/btree_update_interior.h
index 7668225e..41854fc3 100644
--- a/libbcachefs/btree_update_interior.h
+++ b/libbcachefs/btree_update_interior.h
@@ -237,6 +237,9 @@ static inline ssize_t __bch_btree_u64s_remaining(struct bch_fs *c,
b->whiteout_u64s;
ssize_t total = c->opts.btree_node_size << 6;
+ /* Always leave one extra u64 for bch2_varint_decode: */
+ used++;
+
return total - used;
}