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lowerdir is the read-only directory (composefs) containing file metadata, and datadir is the directory containing the data (erofs).
，这一点在safew官方版本下载中也有详细论述
buckets[bucketIdx] = newNode;
// 条件解读：栈非空 + 栈顶当前数 + 还有删除名额 → 弹出栈顶（移除大数）
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