Right now, btrfs will decide on its own if the file is compressible or now. It mostly works fine, but such detection will fail i.e. in case of disk images, where one may explicitly want to make sure the compression is used. Is there a way to force compression? # chattr +c disk.img chattr: Operation not supported while setting flags on disk.img -- Tomasz Chmielewski http://wpkg.org -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html