[Bug 271402] graid3 appears to implement BIO_DELETE but does not advertise GEOM::candelete support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271402

            Bug ID: 271402
           Summary: graid3 appears to implement BIO_DELETE but does not
                    advertise GEOM::candelete support
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: noah.bergbauer@tum.de

Looking at the code suggests that graid3 might support BIO_DELETE requests, but
it unconditionally returns EOPNOTSUPP in response to BIO_GETATTR. Hence, when
UFS (or userspace tools like trim) attempt to use TRIM/UNMAP, the check for
GEOM::candelete fails and the operation is treated as unsupported.

This is unfortunate given that it presents a major obstacle for using SSDs with
graid3.

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