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platter-walk\n\nA recursive directory entry iterator that optimizes traversal based on physical disk layout.\nTakes block offsets (via FIEMAP[[1]](https://github.com/torvalds/linux/commit/abc8746eb91fb01e8d411896f80f7687c0d8372e)), inode tables and disk cache locality into account.\n\nFor users (root) who have read access to the underlying block device it also performs readaheads on the directory indicies\nspanning several directories. This is somewhat of a hack since `readahead()` and `posix_fadvise()` do not work on directories directly\nsince they use a separate cache.[[2]](https://www.spinics.net/lists/linux-fsdevel/msg30843.html)[[3]](https://www.spinics.net/lists/linux-fsdevel/msg31321.html)\n\nThe largest benefits can be realized on HDDs with ext4 filesystems.\n\nTraversal can be optimized for\n\n* simple directory entry listing (name and `d_type` only)\n* detailed entry listing (`stat`)\n* reading file contents. Entry batches are sorted by physical offset.\n\nSee [ffcnt](https://github.com/the8472/ffcnt#unscientific-benchmark) and [fastar](https://github.com/the8472/fastar#benchmarks) for benchmarks.\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fthe8472%2Fplatter-walk","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fthe8472%2Fplatter-walk","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fthe8472%2Fplatter-walk/lists"}