Support adding a spare to a live md array with external metadata.
authorNeil Brown <neilb@notabene.brown>
Fri, 27 Jun 2008 22:31:31 +0000 (08:31 +1000)
committerNeil Brown <neilb@notabene.brown>
Fri, 27 Jun 2008 22:31:31 +0000 (08:31 +1000)
i.e. extend the 'md/dev-XXX/slot' attribute so that you can
tell a device to fill an vacant slot in an and md array.

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

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