does compress-force really force compression? for me (found via compsize - see https://github.com/kilobyte/compsize/issues/24 ) it looks it is problably forcing compression check for every block of a file (while compress= makes btrfs skip compression check after first block) and if some block is incompressible, apparently it's being stored uncompressed. so, the documentation is probably telling misleading information and should be fixed!? roland https://btrfs.wiki.kernel.org/index.php/Compression#What_happens_to_incompressible_files.3F What happens to incompressible files? There is a simple decision logic: if the first portion of data being compressed is not smaller than the original, the compression of the file is disabled -- unless the filesystem is mounted with -o compress-force. In that case it'll be compressed always regardless of the compressibility of the file. This is not optimal and subject to optimizations and further development.
