Even though the data segment maps a file, it is a private memory mapping, which means that updates to memory are not reflected in the underlying file.
尽管数据段映射了文件，但这种内存映射是私有的，也就是说，数据段的内存更新不会在其映射的文件中生效。
2
Here, the layout enumerates the servers that hold the pieces of the file, the size of the stripe on each server, and the NFS file handle of each segment.
在这里，布局枚举持有文件片段的服务器、每个服务器上文件片段的大小，以及每个片段的NFS文件句柄。
3
The text segment also maps your binary file in memory, but writes to this area earn your program a Segmentation Fault.