xfs_mkfile [ -v ] [ -n ] size[k|b|m|g] filename ...
xfs_mkfile creates one or more files. The file is padded with zeroes by default. The default size is in bytes, but it can be flagged as kilobytes, blocks, megabytes, or gigabytes with the k, b, m, or g suffixes, respectively.
Verbose. Report the names and sizes of created files.
No bytes. Create a holey file - that is, do not write out any data, just seek to end of file and write a block.