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如何获取扇区值,即 bio->bi_sector 的扇区值,以对块设备进行 bio 提交 I/O 调用?我有索引节点、页面索引和页面。我需要为块设备找到一个合适的扇区值来完成向设备写入页面的 I/O。
谢谢!