GSoC 2018 weeks 3-4 - understanding BTRFS internals

Hi all!
This two weeks I was diving into btrfs structures and on-disk layout. Writing an ASM program from scratch is not that simple so I decided to convert a VirtualBox image with BTRFS filesystem in it to raw file and write a python script to parse and show internal filesystem structures.

It was also useful for understanding how files are stored in FS, because information on btrfs.wiki.kernel.org was not enough for me to understand some corner cases.

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