scsi_dh framework update take #2

Hi James,

this is the second repost of my patchset to update the
scsi_dh
infrastructure. It includes the comments by Chandra.

It's based on the current scsi-misc tree.

Main features of the patchset 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 device 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.
- Manually attach a device when a hardware handler
 is specified; this allows multipath to override
 the built-in hardware table.
- Update dm-multipath to explicitly attach to
 the specified device handler. This allows
 overriding of the built-in table by the
 multipath values.

As per usual, comment etc are welcome.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
haresuse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)

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Hi Hannes,

I looked at the patches except 3, 4 and 5 (as I don't have
context
knowledge).

Thanks,

chandra
On Tue, 2008-05-20 at 16:04 +0200, Hannes Reinecke wrote:
> Hi James,
> 
> this is the second repost of my patchset to update the
scsi_dh
> infrastructure. It includes the comments by Chandra.
> 
> It's based on the current scsi-misc tree.
> 
> Main features of the patchset 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 device 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.
> - Manually attach a device when a hardware handler
>  is specified; this allows multipath to override
>  the built-in hardware table.
> - Update dm-multipath to explicitly attach to
>  the specified device handler. This allows
>  overriding of the built-in table by the
>  multipath values.
> 
> As per usual, comment etc are welcome.
> 
> Cheers,
> 
> Hannes

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