translate INVARIANTS to DEBUG for code from OpenSolaris

[Steven Hartland]

----- Original Message ----- 
From: "Andriy Gapon" <avg at FreeBSD.org>

>> I'm not sure you need #define ZFS_DEBUG as its already a dependency on
>> DEBUG see:
>> sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_debug.h
> 
> Good point.  Thank you.
> 
>> Should this connection be broken and INVARIANTS only trigger DEBUG by
>> default? One potential reason for this distinction is that ZFS_DEBUG brings
>> with it some potentially quite heavy weight validation such as dnode_verify.
>> 
>> If so I have small list of additional fixes here that where required when
>> I tested enabling ASSERTS checking without ZFS_DEBUG.
>> 
>> What do others think, should INVARIANTS trigger ZFS_DEBUG or should that
>> be kept seperate?
> 
> I would prefer to follow what upstream does in this respect.
> If DEBUG implies ZFS_DEBUG upstream, then I think that we should do the same for
> INVARIANTS -> DEBUG -> ZFS_DEBUG.
> Unless there are strong reasons to do otherwise.

Been testing this today including forcing a ZFS ASSERT violation and it
all works as expected including not getting all the false positive LOR :)

Do intend to get this committed in the near future?

    Regards
    Steve

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