[Bug 198863] [patch] geli: TRIM passthru

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198863

            Bug ID: 198863
           Summary: [patch] geli: TRIM passthru
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fullermd at over-yonder.net
          Keywords: patch

Created attachment 154746
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=154746&action=edit
Patch

Add a flag -t to init/onetime to enable TRIM passthru, and -[tT] to configure
to adjust it on existing providers.  This will cause GELI to transparently pass
through BIO_DELETE's to the underlying provider, so space on things like zvol's
can be reclaimed, and SSD's can clean up unused sectors.


This includes a fix from Fabian Keil <freebsd-listen at fabiankeil.de> for
'configure' on onetime providers which is not strictly related, but is
entangled in the same code, so would cause conflicts if separated out.

Has been discussed on -geom@
(https://lists.freebsd.org/pipermail/freebsd-geom/2015-March/006070.html) and
has general approval there.

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