blk-mq: Allow requests to never expire
authorKeith Busch <keith.busch@intel.com>
Thu, 8 Jan 2015 01:55:46 +0000 (18:55 -0700)
committerJens Axboe <axboe@fb.com>
Thu, 8 Jan 2015 15:59:01 +0000 (08:59 -0700)
Some types of requests may be started that are not gauranteed to ever
complete. This adds a request flag that a driver can use so mark the
request as such.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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