scsi_dh framework update

Hi James,

this is a repost of my patchset to update the scsi_dh infrastructure.

It's now based on the current scsi-misc tree and includes some bugfixes:
- A typo in the ALUA prep_fn function
- Fixed a request leak; none of the scsi_dh handler do a blk_put_request() currently.
- Made the comments kernel-doc compliant.
- Added two new return codes SCSI_DH_DEV_NOTSUPP and SCSI_DH_SENSE_AVAIL.

Main features of the updates are:
- Use a single callback for the notifier chain
- Merge all device maps into a single list, which will be scanned by a generic function
- Add a sysfs attribute 'dh_state' for each sdev
- Add a generic SPC-3 ALUA handler
- Update device handlers to check if the device actually supports this handler. When attaching manually we are able to attach to basically any device, so we have to make sure that the device handler is actually supported.

Two issues are still outstanding:
- Argument passing to the device handler:
Some device handler have options which cannot
be determined automatically. We need to be
able to pass these argument down from the
device-mapper layer.
- Update the RDAC device handler to attach
only to devices supporting RDAC.
Chandra, your call :-)

As per usual, comment etc are welcome.

Cheers,

Hannes

Dr. Hannes Reinecke		      zSeries & Storage
[email protected]			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N�rnberg
GF: Markus Rex, HRB 16746 (AG N�rnberg)
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