this post was submitted on 14 Sep 2026
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Stages of POSIX enlightenment:
Most people stop at stage 2, stage 3 hits when you decide to write a filesystem, stage 4 when you've finished your first filesystem. Stage 5 is when you start working on kernel internals. No one can tell you how to reach stage 6, you must discover it for yourself.
/dev/nullsez nothing is also a fileUnfortunately, no one can be told what a file is. You have to see it for yourself.
This is your last chance. After this, there is no turning back. You take the blue pill - the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill - you stay in Wonderland and I show you how deep the file system goes.
Okay, but what are blocks then? A file is really just a bunch of blocked stacked together with the inode metadata also sitting on another block, so is everything just blocks or because you can emulate a block device on a filesystem, are blocks themselves files? If that last part is true then files are infinitely recursive and my head is starting to spin.