From: Christoph Hellwig <hch@infradead.org>
To: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 24/39] blk-mq: add blk_mq_requeue_request
Date: Mon, 17 Mar 2014 06:27:57 -0700 [thread overview]
Message-ID: <20140317133134.969559353@bombadil.infradead.org> (raw)
In-Reply-To: 20140317132733.789623766@bombadil.infradead.org
[-- Attachment #1: 0024-blk-mq-add-blk_mq_requeue_request.patch --]
[-- Type: text/plain, Size: 2112 bytes --]
This allows to requeue a request that has been accepted by ->queue_rq
earlier. This is needed by the SCSI layer in various error conditions.
The existing internal blk_mq_requeue_request is renamed to
__blk_mq_requeue_request as it is a lower level building block for this
funtionality.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/blk-mq.c | 18 ++++++++++++++++--
include/linux/blk-mq.h | 2 ++
2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index c7e723e..9e13761 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -380,7 +380,7 @@ static void blk_mq_start_request(struct request *rq, bool last)
rq->cmd_flags |= REQ_END;
}
-static void blk_mq_requeue_request(struct request *rq)
+static void __blk_mq_requeue_request(struct request *rq)
{
struct request_queue *q = rq->q;
@@ -393,6 +393,20 @@ static void blk_mq_requeue_request(struct request *rq)
rq->nr_phys_segments--;
}
+/* XXX: misnamed, only unpreps but leaves the actual requeue to the caller. */
+void blk_mq_requeue_request(struct request *rq)
+{
+ struct request_queue *q = rq->q;
+
+ __blk_mq_requeue_request(rq);
+ blk_clear_rq_complete(rq);
+
+ trace_block_rq_requeue(q, rq);
+
+ BUG_ON(blk_queued_rq(rq));
+}
+EXPORT_SYMBOL(blk_mq_requeue_request);
+
struct blk_mq_timeout_data {
struct blk_mq_hw_ctx *hctx;
unsigned long *next;
@@ -573,7 +587,7 @@ static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx)
* time
*/
list_add(&rq->queuelist, &rq_list);
- blk_mq_requeue_request(rq);
+ __blk_mq_requeue_request(rq);
break;
default:
pr_err("blk-mq: bad return on queue: %d\n", ret);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index cac10e1..6325a24 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -148,6 +148,8 @@ static inline void blk_mq_end_io(struct request *rq, int error)
BUG_ON(!done);
}
+void blk_mq_requeue_request(struct request *rq);
+
void blk_mq_complete_request(struct request *rq);
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
--
1.7.10.4
next prev parent reply other threads:[~2014-03-17 13:41 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-17 13:27 [PATCH 00/39] [WIP] scsi multiqueue Christoph Hellwig
2014-03-17 13:27 ` [PATCH 01/39] block: fix q->flush_rq NULL pointer crash on dm-mpath flush Christoph Hellwig
2014-03-17 13:27 ` [PATCH 02/39] block: change flush sequence list addition back to front add Christoph Hellwig
2014-03-17 13:27 ` [PATCH 03/39] blk-mq: fix blk_mq_end_io_partial Christoph Hellwig
2014-03-17 13:27 ` [PATCH 04/39] blk-mq: initialize resid_len Christoph Hellwig
2014-03-17 13:27 ` [PATCH 05/39] blk-mq: replace blk_mq_init_commands with a ->init_request method Christoph Hellwig
2014-03-17 13:27 ` [PATCH 06/39] blk-mq: add a exit_request method Christoph Hellwig
2014-03-17 13:27 ` [PATCH 07/39] scsi: avoid useless free_list lock roundtrips Christoph Hellwig
2014-03-17 13:27 ` [PATCH 08/39] scsi: avoid taking host_lock in scsi_run_queue unless nessecary Christoph Hellwig
2014-03-17 13:27 ` [PATCH 09/39] scsi: do not manipulate device reference counts in scsi_get/put_command Christoph Hellwig
2014-03-17 13:27 ` [PATCH 10/39] scsi: remove a useless get/put_device pair in scsi_request_fn Christoph Hellwig
2014-03-17 13:27 ` [PATCH 11/39] scsi: remove a useless get/put_device pair in scsi_next_command Christoph Hellwig
2014-03-17 13:27 ` [PATCH 12/39] scsi: remove a useless get/put_device pair in scsi_requeue_command Christoph Hellwig
2014-03-17 13:27 ` [PATCH 13/39] megaraid: simplify internal command handling Christoph Hellwig
2014-03-21 1:12 ` adam radford
2014-03-17 13:27 ` [PATCH 14/39] scsi: simplify command allocation and freeing a bit Christoph Hellwig
2014-03-17 13:27 ` [PATCH 15/39] scsi: add support for per-host cmd pools Christoph Hellwig
2014-03-17 13:27 ` [PATCH 16/39] virtio_scsi: use cmd_size Christoph Hellwig
2014-03-25 15:31 ` Christoph Hellwig
2014-03-25 15:36 ` Paolo Bonzini
2014-03-27 15:28 ` James Bottomley
2014-03-17 13:27 ` [PATCH 17/39] scsi: explicitly release bidi buffers Christoph Hellwig
2014-03-17 13:27 ` [PATCH 18/39] scsi: remove scsi_end_request Christoph Hellwig
2014-03-17 13:27 ` [PATCH 19/39] scsi: push host_lock down into scsi_{host,target}_queue_ready Christoph Hellwig
2014-03-17 13:27 ` [PATCH 20/39] scsi: convert target_busy to an atomic_t Christoph Hellwig
2014-03-17 13:27 ` [PATCH 21/39] scsi: convert host_busy to atomic_t Christoph Hellwig
2014-03-17 13:27 ` [PATCH 22/39] scsi: convert device_busy " Christoph Hellwig
2014-03-17 13:27 ` [PATCH 23/39] scsi: fix the {host,target,device}_blocked counter mess Christoph Hellwig
2014-03-17 13:27 ` Christoph Hellwig [this message]
2014-03-17 13:27 ` [PATCH 25/39] blk-mq: add async paramter to blk_mq_start_stopped_hw_queues Christoph Hellwig
2014-03-17 13:27 ` [PATCH 26/39] HACK: support blk_delay_queue for blk-mq Christoph Hellwig
2014-03-17 13:28 ` [PATCH 27/39] blk-mq: export blk_mq_insert_request Christoph Hellwig
2014-03-17 13:28 ` [PATCH 28/39] scsi: reintroduce scsi_driver.init_command Christoph Hellwig
2014-03-26 9:46 ` Christoph Hellwig
2014-03-17 13:28 ` [PATCH 29/39] block: remove unprep_rq_fn Christoph Hellwig
2014-03-17 13:28 ` [PATCH 30/39] scsi: centralize command re-queueing in scsi_dispatch_fn Christoph Hellwig
2014-03-17 13:28 ` [PATCH 31/39] scsi: split __scsi_queue_insert Christoph Hellwig
2014-03-17 13:28 ` [PATCH 32/39] scsi: unwind blk_end_request_all and blk_end_request_err calls Christoph Hellwig
2014-03-17 13:28 ` [PATCH 33/39] scsi: initial blk-mq support Christoph Hellwig
2014-03-17 13:28 ` [PATCH 34/39] scsi: partially stub out scsi_adjust_queue_depth when using blk-mq Christoph Hellwig
2014-03-17 13:28 ` [PATCH 35/39] virtio_scsi: use blk_mq Christoph Hellwig
2014-03-17 13:28 ` [PATCH 36/39] iscsi_tcp: " Christoph Hellwig
2014-03-17 13:28 ` [PATCH 37/39] ata_piix: " Christoph Hellwig
2014-03-17 13:28 ` [PATCH 38/39] blk-mq: make blk_mq_start_stopped_hw_queues run a queue even if not stopped Christoph Hellwig
2014-03-17 13:28 ` [PATCH 39/39] scsi: implement ->init_request and ->exit_request Christoph Hellwig
2014-03-17 13:33 ` [PATCH 00/39] [WIP] scsi multiqueue Christoph Hellwig
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