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From: Jeffle Xu <[email protected]>
To: [email protected]
Cc: [email protected], [email protected],
	[email protected], [email protected]
Subject: [PATCH v2 4/6] dm: always return BLK_QC_T_NONE for bio-based device
Date: Mon, 25 Jan 2021 20:13:38 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Currently the returned cookie of bio-based device is not used at all.

In the following patch, bio-based device will actually return a
pointer to a specific object as the returned cookie.

Signed-off-by: Jeffle Xu <[email protected]>
Reviewed-by: Mike Snitzer <[email protected]>
---
 drivers/md/dm.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 7bac564f3faa..46ca3b739396 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1252,14 +1252,13 @@ void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
 }
 EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
 
-static blk_qc_t __map_bio(struct dm_target_io *tio)
+static void __map_bio(struct dm_target_io *tio)
 {
 	int r;
 	sector_t sector;
 	struct bio *clone = &tio->clone;
 	struct dm_io *io = tio->io;
 	struct dm_target *ti = tio->ti;
-	blk_qc_t ret = BLK_QC_T_NONE;
 
 	clone->bi_end_io = clone_endio;
 
@@ -1278,7 +1277,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio)
 	case DM_MAPIO_REMAPPED:
 		/* the bio has been remapped so dispatch it */
 		trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector);
-		ret = submit_bio_noacct(clone);
+		submit_bio_noacct(clone);
 		break;
 	case DM_MAPIO_KILL:
 		free_tio(tio);
@@ -1292,8 +1291,6 @@ static blk_qc_t __map_bio(struct dm_target_io *tio)
 		DMWARN("unimplemented target map return value: %d", r);
 		BUG();
 	}
-
-	return ret;
 }
 
 static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len)
@@ -1380,7 +1377,7 @@ static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci,
 	}
 }
 
-static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci,
+static void __clone_and_map_simple_bio(struct clone_info *ci,
 					   struct dm_target_io *tio, unsigned *len)
 {
 	struct bio *clone = &tio->clone;
@@ -1391,7 +1388,7 @@ static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci,
 	if (len)
 		bio_setup_sector(clone, ci->sector, *len);
 
-	return __map_bio(tio);
+	__map_bio(tio);
 }
 
 static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
@@ -1405,7 +1402,7 @@ static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
 
 	while ((bio = bio_list_pop(&blist))) {
 		tio = container_of(bio, struct dm_target_io, clone);
-		(void) __clone_and_map_simple_bio(ci, tio, len);
+		__clone_and_map_simple_bio(ci, tio, len);
 	}
 }
 
@@ -1450,7 +1447,7 @@ static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti,
 		free_tio(tio);
 		return r;
 	}
-	(void) __map_bio(tio);
+	__map_bio(tio);
 
 	return 0;
 }
@@ -1565,11 +1562,10 @@ static void init_clone_info(struct clone_info *ci, struct mapped_device *md,
 /*
  * Entry point to split a bio into clones and submit them to the targets.
  */
-static blk_qc_t __split_and_process_bio(struct mapped_device *md,
+static void __split_and_process_bio(struct mapped_device *md,
 					struct dm_table *map, struct bio *bio)
 {
 	struct clone_info ci;
-	blk_qc_t ret = BLK_QC_T_NONE;
 	int error = 0;
 
 	init_clone_info(&ci, md, map, bio);
@@ -1613,7 +1609,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
 
 				bio_chain(b, bio);
 				trace_block_split(b, bio->bi_iter.bi_sector);
-				ret = submit_bio_noacct(bio);
+				submit_bio_noacct(bio);
 				break;
 			}
 		}
@@ -1621,13 +1617,11 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
 
 	/* drop the extra reference count */
 	dec_pending(ci.io, errno_to_blk_status(error));
-	return ret;
 }
 
 static blk_qc_t dm_submit_bio(struct bio *bio)
 {
 	struct mapped_device *md = bio->bi_disk->private_data;
-	blk_qc_t ret = BLK_QC_T_NONE;
 	int srcu_idx;
 	struct dm_table *map;
 
@@ -1657,10 +1651,10 @@ static blk_qc_t dm_submit_bio(struct bio *bio)
 	if (is_abnormal_io(bio))
 		blk_queue_split(&bio);
 
-	ret = __split_and_process_bio(md, map, bio);
+	__split_and_process_bio(md, map, bio);
 out:
 	dm_put_live_table(md, srcu_idx);
-	return ret;
+	return BLK_QC_T_NONE;
 }
 
 /*-----------------------------------------------------------------
-- 
2.27.0


  parent reply	other threads:[~2021-01-26 20:38 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 12:13 [PATCH v2 0/6] dm: support IO polling for bio-based dm device Jeffle Xu
2021-01-25 12:13 ` [PATCH v2 1/6] block: move definition of blk_qc_t to types.h Jeffle Xu
2021-01-25 12:13 ` [PATCH v2 2/6] block: add queue_to_disk() to get gendisk from request_queue Jeffle Xu
2021-01-27 17:20   ` Mike Snitzer
2021-01-25 12:13 ` [PATCH v2 3/6] block: add iopoll method to support bio-based IO polling Jeffle Xu
2021-01-27 17:14   ` Mike Snitzer
2021-01-28  8:40   ` Christoph Hellwig
2021-01-28 11:52     ` JeffleXu
2021-01-28 14:36       ` Christoph Hellwig
2021-01-25 12:13 ` Jeffle Xu [this message]
2021-01-25 12:13 ` [PATCH v2 5/6] block: add QUEUE_FLAG_POLL_CAP flag Jeffle Xu
2021-01-27 17:13   ` Mike Snitzer
2021-01-28  2:07     ` JeffleXu
2021-01-25 12:13 ` [PATCH v2 6/6] dm: support IO polling for bio-based dm device Jeffle Xu
2021-01-29  7:37   ` JeffleXu
2021-01-27 17:19 ` [PATCH v2 0/6] " Mike Snitzer
2021-01-28  3:06   ` JeffleXu

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