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ZeroFS: A log-structured filesystem for S3. ZeroFS serves S3-compatible buckets as POSIX filesystems over NFS and 9P, or as raw block devices over NBD.

An open-source book on storage technology and file systems. From knot records to Flash physics, from FAT to LittleFS — complete with KnotFS, a teaching-grade log-structured embedded file system (~840 lines C).