# V5 features that were the mkfs defaults when the upstream Linux 6.18 LTS # kernel was released at the end of 2025. [metadata] bigtime=1 crc=1 finobt=1 inobtcount=1 metadir=0 reflink=1 rmapbt=1 [inode] sparse=1 nrext64=1 exchange=1 [naming] parent=1