[Bug 232676] gconcat fails to advertise delete capability

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232676

            Bug ID: 232676
           Summary: gconcat fails to advertise delete capability
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: noah.bergbauer at tum.de

gconcat appears to correctly forward BIO_DELETE requests to the underlying
providers but has no code to handle queries for the candelete attribute. As a
result things TRIM/DISCARD will not work properly through gconcat (e.g. ufs
won't try to use it and print a warning instead).

I think gconcat should advertise delete support whenever any component does.
Those that don't can just ignore it - besides, mixed configurations should be
rather uncommon.

As a sidenote, overriding the candelete property seems like the kind of thing
gnop should be able to do.

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