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.
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.
The devnode that is used to reference the block is a file, so you come back to blocks just 'being offsets into some file'.
Though system calls, ioctls and networking credibly get away from file semantics