RAIDFrame changes

[mlelstv%serpens.de@localhost (Michael van Elst)]

Hi,

now that RAIDFrame is usuable at a module I have prepared
a patch to refactor the driver to use the common dksubr code.

The patch can be found at

 http://ftp.netbsd.org/pub/NetBSD/misc/mlelstv/raidframe.diff

and it includes a few other fixes too:

- finding components now does proper kernel locking by using
  bdev_strategy, previously it would trigger an assertion in the sd
  driver (and maybe others).

- finding components now runs in two passes to prefer wedges over
  raw partitions when the wedge starts at offset 0.

- defer RAIDFRAME_SHUTDOWN (raidctl -u operation) to raidclose.
  - side effect is that 'raidctl -u' succeeds even for units that
        haven't been configured. The previous behaviour was to keep
        the embryonal unit and fail ioctl and close operations which
        prevents unloading of the module.

- moved raidput again to raid_detach() because raid_detach_unlocked()
  is only called for initialized units.

- use common dksubr code
  - the fake device softc now stores a pointer back to the real softc
  - no longer uses a private bufq
  - private disklabel and disk_busy code is gone.

- some extra messages



I will commit this in the next days if there is no objection.




Greetings,
-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."