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To resolve conflict with sys/mount.h and linux/mount.h or linux/fs.h. The conflict between sys/mount.h and linux/mount.h is resolved in glibc-2.37 (774058d72942249f71d74e7f2b639f77184160a6), but our baseline is still glibc-2.31. Also, even with the version or newer, still sys/mount.h conflicts with linux/fs.h, which is included by linux/btrfs.h. This introduces our own implementation of sys/mount.h, that can be simultaneously included with linux/mount.h and linux/fs.h. This also imports linux/fs.h, linux/mount.h, and several other dependent headers. The introduced sys/mount.h header itself may not be enough simple, but by using the header, we can drop most of workarounds in other source files.