[dm-devel] [RFC] zodcache - auto-start dm-cache devices

[Ian Pilcher]

On 12/18/2015 10:55 AM, Ian Pilcher wrote:
> Currently you'll need multiple zodcache devices to create multiple VGs.
> It should be possible to make these devices partitionable with a udev
> rule that calls kpartx as appropriate.

This seems to work:

SUBSYSTEM!="block", GOTO="zodcache_end" 

ACTION=="remove", GOTO="zodcache_end" 

ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", GOTO="zodcache_end" 

KERNEL=="fd*|sr*", GOTO="zodcache_end" 

 

# Look for a zodcache superblock on the device and start it if found 

RUN+="/usr/sbin/zcstart --udev $tempnode" 

 

# Process partition tables on zodcache devices (but not components) 

ENV{DM_NAME}!="zodcache-*", GOTO="zodcache_end" 

ENV{DM_NAME}=="*-origin", GOTO="zodcache_end" 

ENV{DM_NAME}=="*-cache", GOTO="zodcache_end" 

ENV{DM_NAME}=="*-metadata", GOTO="zodcache_end" 

ENV{ID_PART_TABLE_TYPE}=="dos", RUN+="/usr/sbin/kpartx -a $tempnode" 

 

LABEL="zodcache_end"

-- 
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Ian Pilcher                                         arequipeno at gmail.com
-------- "I grew up before Mark Zuckerberg invented friendship" --------
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