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block: add a non-queueable flush flag
authorshaohua.li@intel.com <shaohua.li@intel.com>
Fri, 6 May 2011 17:34:32 +0000 (11:34 -0600)
committerJens Axboe <jaxboe@fusionio.com>
Fri, 6 May 2011 17:36:25 +0000 (11:36 -0600)
flush request isn't queueable in some drives. Add a flag to let driver
notify block layer about this. We can optimize flush performance with the
knowledge.

Stable: 2.6.39 only

Cc: stable@kernel.org
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

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