remove nvme_reinit_tagset and blk_mq_tagset_iter

remove nvme_reinit_tagset and blk_mq_tagset_iter

[Christoph Hellwig]

Now that nvme-fc moved off the reinit request concept both the core nvme
and blk-mq code for it becomes unused.

Jens, are you ok with queuing up the blk-mq side with the pending nvme
changes?

[PATCH 1/2] nvme: remove nvme_reinit_tagset

[Christoph Hellwig]

Unused now that all transports stopped using it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/core.c | 10 ----------
 drivers/nvme/host/nvme.h |  2 --
 2 files changed, 12 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index dee8e71baf62..020a00f932a0 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3627,16 +3627,6 @@ void nvme_start_queues(struct nvme_ctrl *ctrl)
 }
 EXPORT_SYMBOL_GPL(nvme_start_queues);
 
-int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set)
-{
-	if (!ctrl->ops->reinit_request)
-		return 0;
-
-	return blk_mq_tagset_iter(set, set->driver_data,
-			ctrl->ops->reinit_request);
-}
-EXPORT_SYMBOL_GPL(nvme_reinit_tagset);
-
 int __init nvme_core_init(void)
 {
 	int result = -ENOMEM;
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 34df07d44f80..231807cbc849 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -321,7 +321,6 @@ struct nvme_ctrl_ops {
 	void (*submit_async_event)(struct nvme_ctrl *ctrl);
 	void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 	int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
-	int (*reinit_request)(void *data, struct request *rq);
 	void (*stop_ctrl)(struct nvme_ctrl *ctrl);
 };
 
@@ -416,7 +415,6 @@ void nvme_unfreeze(struct nvme_ctrl *ctrl);
 void nvme_wait_freeze(struct nvme_ctrl *ctrl);
 void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
 void nvme_start_freeze(struct nvme_ctrl *ctrl);
-int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set);
 
 #define NVME_QID_ANY -1
 struct request *nvme_alloc_request(struct request_queue *q,
-- 
2.17.1

[PATCH 2/2] blk-mq: remove blk_mq_tagset_iter

[Christoph Hellwig]

Unused now that nvme stopped using it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/blk-mq-tag.c     | 29 -----------------------------
 include/linux/blk-mq.h |  2 --
 2 files changed, 31 deletions(-)

diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 70356a2a11ab..09b2ee6694fb 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -311,35 +311,6 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
 }
 EXPORT_SYMBOL(blk_mq_tagset_busy_iter);
 
-int blk_mq_tagset_iter(struct blk_mq_tag_set *set, void *data,
-			 int (fn)(void *, struct request *))
-{
-	int i, j, ret = 0;
-
-	if (WARN_ON_ONCE(!fn))
-		goto out;
-
-	for (i = 0; i < set->nr_hw_queues; i++) {
-		struct blk_mq_tags *tags = set->tags[i];
-
-		if (!tags)
-			continue;
-
-		for (j = 0; j < tags->nr_tags; j++) {
-			if (!tags->static_rqs[j])
-				continue;
-
-			ret = fn(data, tags->static_rqs[j]);
-			if (ret)
-				goto out;
-		}
-	}
-
-out:
-	return ret;
-}
-EXPORT_SYMBOL_GPL(blk_mq_tagset_iter);
-
 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
 		void *priv)
 {
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index fb355173f3c7..e3147eb74222 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -281,8 +281,6 @@ void blk_freeze_queue_start(struct request_queue *q);
 void blk_mq_freeze_queue_wait(struct request_queue *q);
 int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
 				     unsigned long timeout);
-int blk_mq_tagset_iter(struct blk_mq_tag_set *set, void *data,
-		int (reinit_request)(void *, struct request *));
 
 int blk_mq_map_queues(struct blk_mq_tag_set *set);
 void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
-- 
2.17.1

Re: remove nvme_reinit_tagset and blk_mq_tagset_iter

[Jens Axboe]

On 6/14/18 6:30 AM, Christoph Hellwig wrote:
> Now that nvme-fc moved off the reinit request concept both the core nvme
> and blk-mq code for it becomes unused.
> 
> Jens, are you ok with queuing up the blk-mq side with the pending nvme
> changes?

Are you asking if you can queue it up, presumable because the nvme-fc
change isn't upstream yet? That's fine with me, you can add my
reviewed-by to the patches.

-- 
Jens Axboe

Re: remove nvme_reinit_tagset and blk_mq_tagset_iter

[Jens Axboe]

On 6/14/18 8:54 AM, Christoph Hellwig wrote:
> On Thu, Jun 14, 2018 at 08:45:07AM -0600, Jens Axboe wrote:
>> On 6/14/18 6:30 AM, Christoph Hellwig wrote:
>>> Now that nvme-fc moved off the reinit request concept both the core nvme
>>> and blk-mq code for it becomes unused.
>>>
>>> Jens, are you ok with queuing up the blk-mq side with the pending nvme
>>> changes?
>>
>> Are you asking if you can queue it up, presumable because the nvme-fc
>> change isn't upstream yet? That's fine with me, you can add my
>> reviewed-by to the patches.
> 
> Yes, that is the plan.  The nvme changes are fixes I'm going to send
> you ASAP, and I think we can just send the dead code removal along.

OK, that sounds fine then. Please do send them asap, so I can ship
what I have for Linus before he cuts -rc1 on Sunday.

-- 
Jens Axboe

Re: remove nvme_reinit_tagset and blk_mq_tagset_iter

[Christoph Hellwig]

On Thu, Jun 14, 2018 at 08:45:07AM -0600, Jens Axboe wrote:
> On 6/14/18 6:30 AM, Christoph Hellwig wrote:
> > Now that nvme-fc moved off the reinit request concept both the core nvme
> > and blk-mq code for it becomes unused.
> > 
> > Jens, are you ok with queuing up the blk-mq side with the pending nvme
> > changes?
> 
> Are you asking if you can queue it up, presumable because the nvme-fc
> change isn't upstream yet? That's fine with me, you can add my
> reviewed-by to the patches.

Yes, that is the plan.  The nvme changes are fixes I'm going to send
you ASAP, and I think we can just send the dead code removal along.