Linux: Btrfs, File Data and Metadata Checksums
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Chris Mason announced an early alpha release of his new Btrfs filesystem, "after the last FS summit, I started working on a new filesystem that maintains checksums of all file data and metadata." He listed the following features as "mostly implemented": "extent based file storage (2^64 max file size), space efficient packing of small files, space efficient indexed directories, dynamic inode allocation, writable snapshots, subvolumes (separate internal filesystem roots), checksums on data and metadata (multiple algorithms available), very fast offline filesystem check". He listed the following features as yet to be implemented: "object level mirroring and striping, strong integration with device mapper for multiple device support, online filesystem check, efficient incremental backup and FS mirroring".
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