On Mon, Nov 21, 2011 at 10:31:21PM +1100, Dave Chinner wrote:

From: Dave Chinner <redacted>

Make it easier to check large filesystems quickly by adding a
--large-fs option to check to turn on shortcuts for large scratch
device filesystem testing.

Also, reject invalid command line options with a usage message.

Looks good, except that the help text for it doesn't look overly useful.
I don't think we "optimise" for large filesystems, we simply fill most
of it, which is what the documentation should mention.