[PATCH] mkfs: add discard support

[Christoph Hellwig]

On Wed, Oct 07, 2009 at 06:24:33AM +1100, Nathan Scott wrote:
> It might be a bit cleaner to add this in with the existing platform-
> specific code in libxfs/linux.c (or perhaps include/platform_defs.h)
> with wrappers for the other platforms, rather than putting it directly
> in mkfs like this?  repair may want to use this someday too, I guess.

Yeah, that might be better.