xfs: add FITRIM support

[Michael Monnerie]

On Donnerstag, 6. Januar 2011 Dave Chinner wrote:
> Realistically, we have
> to design for how we expect devices to behave in 2-3 years time, not
> waste time trying to optimise for fundamentally broken devices that
> nobody will be using in 2-3 years time...

I see, thanks for the explanation. I hope that there will be a solution 
that allows us to FITRIM on Saturday "in the background", so the thin 
provisioned VMs are smaller and faster to back up. That's my immediate 
wish, as we currently don't use SSDs.

-- 
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc

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