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block: elevator quiescing helpers
authorJens Axboe <jens.axboe@oracle.com>
Fri, 27 Mar 2009 09:30:47 +0000 (10:30 +0100)
committerJens Axboe <jens.axboe@oracle.com>
Tue, 7 Apr 2009 06:12:37 +0000 (08:12 +0200)
Simple helper functions to quiesce the request queue. These are
currently only used for switching IO schedulers on-the-fly, but
we can use them to properly switch IO accounting on and off as well.

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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