When another user requires access to the file, their security credentials are verified before being granted access to the data even though the file data is already in memory and in clear format.

当另一个用户需要访问该文件时，在授予对数据的访问权限之前，将验证其安全凭据，既使这些文件数据已经以明文格式存在于内存中。

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Linux uses the shmget/mmap function to access files by directly incorporating file data into memory.

Linux 使用 shmget/mmap 函数通过直接将文件数据 合并入内存来访问文件。

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The first copy (see Figure 1) is performed by the direct memory access (DMA) engine, which reads file contents from the disk and stores them into a kernel address space buffer.

直接内存存取(direct memory access, DMA)引擎执行了第一次拷贝(参见图1)，它从磁盘中读取文件内容，然后将它们存储到一个内核地址空间缓存区中。

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