Compiling module that involves 'sys_mount' calls

Question

I'm developing a module for linux and I need to mount a .iso file.

I have read and found that there is a function called sys_mount that calls the linux's mount programm and does all that stuff.

The problem is that when I'm trying to compile it shows a warning that says: '"sys_mount" [/home/.../example.ko] undefined!' and then when I try "insmod example.ko" it says that "insmod: error inserting 'example.ko': -1 Unkown symbol in module".

Does anyone know what should I do to compile it? Do I need to include something that is missing?

Thanks in advice!

Answer 1

sys_mount is what a user program invokes via the mount syscall. It performs argument validation and copying before calling do_mount, which does the bulk of the job. From within the kernel, call do_mount directly. This sys_foo/do_foo separation is a common convention for Linux syscall implementation.