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blk-mq: allow changing of queue depth through sysfs

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For request_fn based devices, the block layer exports a 'nr_requests'
file through sysfs to allow adjusting of queue depth on the fly.
Currently this returns -EINVAL for blk-mq, since it's not wired up.
Wire this up for blk-mq, so that it now also always dynamic
adjustments of the allowed queue depth for any given block device
managed by blk-mq.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2014-05-20 11:49:02 -06:00
commit e3a2b3f931
8 changed files with 134 additions and 60 deletions
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2
block/blk.h
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@ -188,6 +188,8 @@ static inline int queue_congestion_off_threshold(struct request_queue *q)
return q->nr_congestion_off;
}
extern int blk_update_nr_requests(struct request_queue *, unsigned int);
/*
* Contribute to IO statistics IFF:
*