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Workqueue framework and ALUA hardware handler

Hannes Reinecke dm-devel linux-scsi 1 version In review

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  1. v1 Latest3 patches 3 repliesIn review

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#Subject and filesSizeRepliesApplied
1/3multipath: Implement workqueue framework for hardware handlerdrivers/md/dm-hw-handler.c drivers/md/dm-hw-handler.h drivers/md/dm-mpath-rdac.c +1 more+153 -550 replies
2/3multipath: Add new SPC-3 ALUA hardware handlerdrivers/md/Kconfig drivers/md/Makefile drivers/md/dm-mpath-alua.c +1 more+693 -02 replies
3/3multipath: implement controller framework for hardware handlersdrivers/md/dm-hw-handler.c drivers/md/dm-hw-handler.h drivers/md/dm-mpath-rdac.c+216 -1030 replies

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Cover letter [PATCH 0/3] Workqueue framework and ALUA hardware handler

Hi all,

this patchset adds some more abstraction to the multipath hardware handlers.
- A generic workqueue framework is added, which allows the hardware handler to submit failover commands independent from multipath I/O.
- The exsting RDAC hardware handler is converted to use that framework
- A new SPC-3 ALUA hardware handler is added, using that framework
- A controller abstraction is added to the framework, which allows for command throttling based on the used controller.
- The RDAC hardware handler is modified to use the new controller framework.

This patchset superseded my previous implementation of the SPC-3 ALUA handler.
Next plans are to update the table definitions and multipath-tools to allow for a passing of the controller ID from userland; ALUA doesn't specify for any controller information, so we have to do this by hand based on prior knowledge of the storage array.

As per normal, comments etc welcome.

Cheers,

Hannes

Signature · 8 lines
Dr. Hannes Reinecke		      zSeries & Storage
[email protected]			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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Read the cover letter in its thread