The zonefs (zone file system) feature is a simple file system that exposes each zone of a zoned block device as a file. Unlike a regular POSIX-compliant file system with native zoned block device support, for example, f2fs, zonefs does not hide the sequential write constraint of zoned block devices to the user. Files that represent sequential write zones of the device must be written sequentially, starting from the end of the file (append only writes).