Overriding functionality with modules in Linux kernel

Question

Without getting into the details of why, I\'m looking for a clean (as possible) way to replace kernel functions and system calls from a loadable module. My initial

Answer 1

Most filesystem work is done in modules already, presuming that the filesystem code was built as a module, rather than built into the kernel (which means the 'real' answer depends on kernel build options).

Assuming that the bits you want to log are all filesystem-related, and that those filesystem routines are built as modules, you should just be able to alter the filesystem module(s) you're interested in, and reload them.

If those assumptions aren't true, or can't be made true, then things clearly get trickier, and I really couldn't point you much further.