md: add ->takeover method to support changing the personality managing an array

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Implement this for RAID6 to be able to 'takeover' a RAID5 array.  The
new RAID6 will use a layout which places Q on the last device, and
that device will be missing.
If there are any available spares, one will immediately have Q
recovered onto it.

Signed-off-by: NeilBrown <neilb@suse.de>

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NeilBrown 2009-03-31 14:39:39 +11:00

parent 409c57f380

commit 245f46c2c2

3 changed files with 161 additions and 14 deletions

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101

drivers/md/md.c

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10

drivers/md/md.h

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64

drivers/md/raid5.c

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