LinuxCon + CloudOpen + ContainerCon NA 2015

You're probably familiar with this dreaded scenario when you first started out using Linux: accidentally removing an important file with the rm command. And of course, there's no recycling bin! In this talk I'll share with you one of my first kernel hacks - implementing an undo rm "unrm" operation in the Linux kernel. This talk aims to be a gentle introduction to kernel development, in the form of a project show-and-tell. We'll start our trace of a typical unrm call from userspace and make our way down to Linux's VFS layer. In the process, I'll show you what a typical kernel debugging session might look like, and how you might make changes and run your kernel. In the end we'll put these concepts together and demo unrm's functionality.