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authorNeilBrown <neilb@suse.de>2010-04-14 17:15:37 +1000
committerNeilBrown <neilb@suse.de>2010-05-17 14:45:40 +1000
commita64c876fd357906a1f7193723866562ad290654c (patch)
tree077fcdab730d40227585025bf15bf8e027949a29 /drivers/parport
parentb6eb127d274385d81ce8dd45c98190f097bce1b4 (diff)
md: manage redundancy group in sysfs when changing level.
Some levels expect the 'redundancy group' to be present, others don't. So when we change level of an array we might need to add or remove this group. This requires fixing up the current practice of overloading ->private to indicate (when ->pers == NULL) that something needs to be removed. So create a new ->to_remove to fill that role. When changing levels, we may need to add or remove attributes. When changing RAID5 -> RAID6, we both add and remove the same thing. It is important to catch this and optimise it out as the removal is delayed until a lock is released, so trying to add immediately would cause problems. Cc: stable@kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
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