[$] Filesystems for zoned block devices

Damien Le Moal and Naohiro Aota led a combined storage and filesystem
session at the 2019 Linux Storage, Filesystem, and Memory-Management Summit
(LSFMM) on filesystem work that has been done for zoned block devices.
These devices have multiple zones with different characteristics; usually
there are zones that can only be written in sequential order as well as
conventional zones that can be written in random order. The genesis of zoned
block devices is shingled
magnetic recording (SMR) devices, which were created to increase the
capacity of hard disks, but at the cost of some flexibility.