Talk about a deceptively simple assignment. Two parts: implement 'immediate files' and 'encryption'. There were times when a single line of code took hours to research. The lecture content was basically: there exists a VFS and data is stored in blocks. I walked the Linux source tree* down from the open and write system calls through the VFS layer to the block device driver to understand this stuff and it was a lot of fun.
*Linux source (file systems)
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