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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 <axboe@fb.com>
This commit is contained in:
Jens Axboe
2014-05-20 11:49:02 -06:00
parent 64b14519e5
commit e3a2b3f931
8 changed files with 133 additions and 59 deletions
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2
include/linux/blk-mq.h
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@@ -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;