If the source is not modified, the snapshot does not store any of the files in its own physical disk space and has the same content as the original file system.
如果源文件系统没有修改，快照不会在其自己的物理磁盘空间中存储任何文件，并且具有的内容与原始文件系统相同。
Regions in a process's virtual address space can be mapped to physical memory, to a file, or to any other addressable storage.
进程的虚拟地址空间中的区域可被映射到物理内存、文件或任何其他可寻址存储。
Regions in a process's virtual address space can be mapped to physical memory, to a file, or to any other addressable storage.
进程的虚拟地址空间中的区域可被映射到物理内存、文件或任何其他可寻址存储。
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