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Compression - btrfs Wikihttps://btrfs.wiki.kernel.org/index.php/Compression> Can I force compression on a file without using the compress mount option?> > Yes. The utility chattr supports setting file attribute c that marks the inode to compress newly written data. Setting the compression property on a file using btrfs property set <file> compression <zlib|lzo|zstd> will force compression to be used on that file using the specified algorithm.

`btrfs property set <file> compression zstd:15`とかはいけそう あとはfindあたりでこれを回せばよ