RFC: Pass TRIM through GELI

[Fabian Keil]

"Matthew D. Fuller" <fullermd at over-yonder.net> wrote:

> > I've done a quick implementation of TRIM passthru support for GELI.
> 
> Here's a slightly updated version.  Some adjustments to the manpage
> suggested by jmg@, and I've stripped out the new version and checks
> for it.
> 
> <http://www.over-yonder.net/~fullermd/dl/geli-delete.2.patch>

Awesome. With a kernel based on r279996 the deletes make it to
the zvol and zfs list confirms that the space is marked as free.
ZFS on GELI on zvol works as expected as well.

Additional testing revealed a NULL pointer dereference:
http://www.fabiankeil.de/sourcecode/electrobsd/g_eli_ctl_onetime-Fix-NULL-pointer-dereference.diff

Fabian
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