sync_file_range
COMPAT_SYSCALL_DEFINE6(sync_file_range, unsigned int, fd, u32, off_high, u32, off_low,
return sync_file_range(fd_file(f), offset, nbytes, flags);
SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
COMPAT_SYSCALL_DEFINE6(sync_file_range, int, fd, compat_arg_u64_dual(offset),
extern int sync_file_range(struct file *file, loff_t offset, loff_t nbytes,
ret = sync_file_range(req->file, sync->off, sync->len, sync->flags);