md: manage redundancy group in sysfs when changing level.

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commit a64c876fd3 upstream.

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.


Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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This commit is contained in:

NeilBrown 2010-04-14 17:15:37 +10:00 • committed by Greg Kroah-Hartman

parent 3bbcbb8c48

commit da7d96769c

3 changed files with 38 additions and 13 deletions

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43

drivers/md/md.c

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1

drivers/md/md.h

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7

drivers/md/raid5.c

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