linux-kernel - [PATCH 8/8] block: remove bidi support

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Date:   Sun, 11 Nov 2018 14:32:11 +0100
From:   Christoph Hellwig <hch@....de>
To:     axboe@...nel.dk, martin.petersen@...cle.com, ooo@...ctrozaur.com
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        Benjamin Block <bblock@...ux.vnet.ibm.com>,
        linux-scsi@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] block: remove bidi support

Unused now, and another field in struct request bites the dust.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 block/blk-mq-debugfs.c | 1 -
 block/blk-mq.c         | 3 ---
 include/linux/blkdev.h | 6 ------
 3 files changed, 10 deletions(-)

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index f021f4817b80..82f5e836fe30 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -115,7 +115,6 @@ static const char *const blk_queue_flag_name[] = {
 	QUEUE_FLAG_NAME(STOPPED),
 	QUEUE_FLAG_NAME(DYING),
 	QUEUE_FLAG_NAME(BYPASS),
-	QUEUE_FLAG_NAME(BIDI),
 	QUEUE_FLAG_NAME(NOMERGES),
 	QUEUE_FLAG_NAME(SAME_COMP),
 	QUEUE_FLAG_NAME(FAIL_IO),
diff --git a/block/blk-mq.c b/block/blk-mq.c
index c1bb0c0b2ad8..95c858b9309e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -330,7 +330,6 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
 
 	rq->end_io = NULL;
 	rq->end_io_data = NULL;
-	rq->next_rq = NULL;
 
 	data->ctx->rq_dispatched[op_is_sync(op)]++;
 	refcount_set(&rq->ref, 1);
@@ -537,8 +536,6 @@ inline void __blk_mq_end_request(struct request *rq, blk_status_t error)
 		rq_qos_done(rq->q, rq);
 		rq->end_io(rq, error);
 	} else {
-		if (unlikely(blk_bidi_rq(rq)))
-			blk_mq_free_request(rq->next_rq);
 		blk_mq_free_request(rq);
 	}
 }
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index adafeb1e0c2b..944157e78f06 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -236,9 +236,6 @@ struct request {
 	 */
 	rq_end_io_fn *end_io;
 	void *end_io_data;
-
-	/* for bidi */
-	struct request *next_rq;
 };
 
 static inline bool blk_op_is_scsi(unsigned int op)
@@ -588,7 +585,6 @@ struct request_queue {
 #define QUEUE_FLAG_STOPPED	1	/* queue is stopped */
 #define QUEUE_FLAG_DYING	2	/* queue being torn down */
 #define QUEUE_FLAG_BYPASS	3	/* act as dumb FIFO queue */
-#define QUEUE_FLAG_BIDI		4	/* queue supports bidi requests */
 #define QUEUE_FLAG_NOMERGES     5	/* disable merge attempts */
 #define QUEUE_FLAG_SAME_COMP	6	/* complete on same CPU-group */
 #define QUEUE_FLAG_FAIL_IO	7	/* fake timeout */
@@ -663,8 +659,6 @@ static inline bool blk_account_rq(struct request *rq)
 	return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
 }
 
-#define blk_bidi_rq(rq)		((rq)->next_rq != NULL)
-
 #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
 
 #define rq_data_dir(rq)		(op_is_write(req_op(rq)) ? WRITE : READ)
-- 
2.19.1