Mazsolázz és vihogj :-)
The main Btrfs features available at the moment include:
Extent based file storage
2^64 byte == 16 EiB maximum file size
Space-efficient packing of small files
Space-efficient indexed directories
Dynamic inode allocation
Writable snapshots, read-only snapshots
Subvolumes (separate internal filesystem roots)
Checksums on data and metadata
Compression (gzip and LZO)
Integrated multiple device support
RAID-0, RAID-1 and RAID-10 implementations
Efficient incremental backup
Background scrub process for finding and fixing errors on files with redundant copies
Online filesystem defragmentation
Additional features in development, or planned, include:
Very fast offline filesystem check (coming soon!)
RAID-5 and RAID-6
Object-level mirroring and striping
Alternative checksum algorithms
Online filesystem check
Efficient incremental filesystem mirroring