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I see they use another approach to file systems. They sound very confident. A bit too confident to my taste. Are they experienced enough in building file systems that they won't run into huge problems arising when it actually goes into the dirty details?

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The developer of bcachefs already has the experience of creating bcache, a general-purpose block-level caching system that is optimized for the characteristics of flash-based SSDs as the cache devices. The original bcache essentially serves as the proof of concept and practice implementation for all the lower-level portions of bcachefs (not that it was planned that way; they just realized while working on bcache they had implemented most of a filesystem).

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