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authorJens Axboe <axboe@fb.com>2014-05-20 11:49:02 -0600
committerJens Axboe <axboe@fb.com>2014-05-20 11:49:02 -0600
commite3a2b3f931f59d5284abd13faf8bded726884ffd (patch)
treef5426a4745996e95afc2f01f826e846710929dc2 /block/blk.h
parent64b14519e5913e8d4de9f2e5d9ef59abba3ed83d (diff)
blk-mq: allow changing of queue depth through sysfs
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 <axboe@fb.com>
Diffstat (limited to 'block/blk.h')
-rw-r--r--block/blk.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk.h b/block/blk.h
index 95cab70000e3..45385e9abf6f 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -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:
*