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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 /include/linux/blk-mq.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 'include/linux/blk-mq.h')
-rw-r--r--include/linux/blk-mq.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index a06ca7b5ea05..f45424453338 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -63,7 +63,7 @@ struct blk_mq_hw_ctx {
struct blk_mq_tag_set {
struct blk_mq_ops *ops;
unsigned int nr_hw_queues;
- unsigned int queue_depth;
+ unsigned int queue_depth; /* max hw supported */
unsigned int reserved_tags;
unsigned int cmd_size; /* per-request extra data */
int numa_node;