Used to synchronize access to the file control block.

用于同步对文件控制块的访问。

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Many application access the file system assuming that it is a block device.

许多应用程序访问文件系统，假设它是一个块设备。

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Many application access the file system assuming that it is a block device.

许多应用程序访问文件系统，假设它是一个块设备。

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