grep -rn 'open_by_handle_at' /usr/include/*
/usr/include/asm-generic/unistd.h:677:#define __NR_open_by_handle_at         265
/usr/include/asm-generic/unistd.h:678:__SC_COMP(__NR_open_by_handle_at, sys_open_by_handle_at, \
/usr/include/asm-generic/unistd.h:679:	  compat_sys_open_by_handle_at)
grep: /usr/include/driver.h: No such file or directory
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:673:#define __NR_open_by_handle_at			304
/usr/include/x86_64-linux-gnu/asm/unistd_64.h:674:__SYSCALL(__NR_open_by_handle_at, sys_open_by_handle_at)
/usr/include/x86_64-linux-gnu/asm/unistd_32.h:350:#define __NR_open_by_handle_at  342
/usr/include/x86_64-linux-gnu/bits/syscall.h:193:#define SYS_open_by_handle_at __NR_open_by_handle_at
/usr/include/x86_64-linux-gnu/bits/syscall.h:522:#define SYS_open_by_handle_at __NR_open_by_handle_at
/usr/include/x86_64-linux-gnu/bits/fcntl.h:351:extern int open_by_handle_at (int __mountdirfd, struct file_handle *__handle,