4.7. mkfs - Naming options

Specify the version and size parameters for the naming (directory) area of the filesystem.

The naming (directory) version is either 2 (default) or ci (implies version 2).
Version 2 allows for the directory block size to be a multiple of the allocation block size
Version ci supports ASCII-only case-insensitive naming
XFS on Linux does not support naming (directory) version 1.

To create a filesystem with a directory block size of 16KB you would use:

mkfs.xfs -n size=16384 device

ASCII-only case-insensitive naming:

mkfs.xfs -n version=ci device