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Re:The BeOS file system, an OS geek retrospective by Tomte on Friday July 06, 2018 @01:50AM (#17469201)
Also interesting: Practical File System Design with the Be File System

http://www.nobius.org/~dbg/practical-file-system-design.pdf

Re:The BeOS file system, an OS geek retrospective by brazzy on Friday July 06, 2018 @03:23AM (#17469614)
Seconded, I owned that in printed form, and it is very well-written