blk-mq-tag: change busy_iter_fn to return whether to continue or not

We have this functionality in sbitmap, but we don't export it in
blk-mq for users of the tags busy iteration. This can be useful
for stopping the iteration, if the caller doesn't need to find
more requests.

Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

3 files changed, 5 insertions, 4 deletions

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 2e65be8b1387..f172d63db2b5 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -268,14 +268,14 @@ void nvme_complete_rq(struct request *req)
 }
 EXPORT_SYMBOL_GPL(nvme_complete_rq);
 
-void nvme_cancel_request(struct request *req, void *data, bool reserved)
+bool nvme_cancel_request(struct request *req, void *data, bool reserved)
 {
 	dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
 				"Cancelling I/O %d", req->tag);
 
 	nvme_req(req)->status = NVME_SC_ABORT_REQ;
 	blk_mq_complete_request(req);
-
+	return true;
 }
 EXPORT_SYMBOL_GPL(nvme_cancel_request);
 
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 0b70c8bab045..98c3c77f48f6 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2386,7 +2386,7 @@ nvme_fc_complete_rq(struct request *rq)
  * status. The done path will return the io request back to the block
  * layer with an error status.
  */
-static void
+static bool
 nvme_fc_terminate_exchange(struct request *req, void *data, bool reserved)
 {
 	struct nvme_ctrl *nctrl = data;
@@ -2394,6 +2394,7 @@ nvme_fc_terminate_exchange(struct request *req, void *data, bool reserved)
 	struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(req);
 
 	__nvme_fc_abort_op(ctrl, op);
+	return true;
 }
 
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index cee79cb388af..32a1f1cfdfb4 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -408,7 +408,7 @@ static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl)
 }
 
 void nvme_complete_rq(struct request *req);
-void nvme_cancel_request(struct request *req, void *data, bool reserved);
+bool nvme_cancel_request(struct request *req, void *data, bool reserved);
 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		enum nvme_ctrl_state new_state);
 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);