linux-kernel - [PATCH v2 2/2] null_blk: Make use of bytes_to

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Date:   Wed,  1 May 2019 22:57:28 -0300
From:   Marcos Paulo de Souza <marcos.souza.org@...il.com>
To:     linux-block@...r.kernel.org
Cc:     Marcos Paulo de Souza <marcos.souza.org@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 2/2] null_blk: Make use of bytes_to_sectors helper

This helper tries to make the code easier to read, and unifies the code
of returning the number of sectors for a given number of bytes.

Reviewed-by : Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@...il.com>

---
 Changes from v1:
 Rename size_to_sectors to bytes_to_sectors. (Martin K. Petersen)

 drivers/block/null_blk_main.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index d7ac09c092f2..4c48f2a30941 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -853,7 +853,7 @@ static int null_flush_cache_page(struct nullb *nullb, struct nullb_page *c_page)
 	dst = kmap_atomic(t_page->page);
 
 	for (i = 0; i < PAGE_SECTORS;
-			i += (nullb->dev->blocksize >> SECTOR_SHIFT)) {
+			i += (bytes_to_sectors(nullb->dev->blocksize))) {
 		if (test_bit(i, c_page->bitmap)) {
 			offset = (i << SECTOR_SHIFT);
 			memcpy(dst + offset, src + offset,
@@ -957,7 +957,7 @@ static int copy_to_nullb(struct nullb *nullb, struct page *source,
 			null_free_sector(nullb, sector, true);
 
 		count += temp;
-		sector += temp >> SECTOR_SHIFT;
+		sector += bytes_to_sectors(temp);
 	}
 	return 0;
 }
@@ -989,7 +989,7 @@ static int copy_from_nullb(struct nullb *nullb, struct page *dest,
 		kunmap_atomic(dst);
 
 		count += temp;
-		sector += temp >> SECTOR_SHIFT;
+		sector += bytes_to_sectors(temp);
 	}
 	return 0;
 }
@@ -1004,7 +1004,7 @@ static void null_handle_discard(struct nullb *nullb, sector_t sector, size_t n)
 		null_free_sector(nullb, sector, false);
 		if (null_cache_active(nullb))
 			null_free_sector(nullb, sector, true);
-		sector += temp >> SECTOR_SHIFT;
+		sector += bytes_to_sectors(temp);
 		n -= temp;
 	}
 	spin_unlock_irq(&nullb->lock);
@@ -1074,7 +1074,7 @@ static int null_handle_rq(struct nullb_cmd *cmd)
 			spin_unlock_irq(&nullb->lock);
 			return err;
 		}
-		sector += len >> SECTOR_SHIFT;
+		sector += bytes_to_sectors(len);
 	}
 	spin_unlock_irq(&nullb->lock);
 
@@ -1109,7 +1109,7 @@ static int null_handle_bio(struct nullb_cmd *cmd)
 			spin_unlock_irq(&nullb->lock);
 			return err;
 		}
-		sector += len >> SECTOR_SHIFT;
+		sector += bytes_to_sectors(len);
 	}
 	spin_unlock_irq(&nullb->lock);
 	return 0;
@@ -1201,7 +1201,7 @@ static blk_status_t null_handle_cmd(struct nullb_cmd *cmd)
 		if (dev->queue_mode == NULL_Q_BIO) {
 			op = bio_op(cmd->bio);
 			sector = cmd->bio->bi_iter.bi_sector;
-			nr_sectors = cmd->bio->bi_iter.bi_size >> 9;
+			nr_sectors = bytes_to_sectors(cmd->bio->bi_iter.bi_size);
 		} else {
 			op = req_op(cmd->rq);
 			sector = blk_rq_pos(cmd->rq);
@@ -1406,7 +1406,7 @@ static void null_config_discard(struct nullb *nullb)
 		return;
 	nullb->q->limits.discard_granularity = nullb->dev->blocksize;
 	nullb->q->limits.discard_alignment = nullb->dev->blocksize;
-	blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9);
+	blk_queue_max_discard_sectors(nullb->q, bytes_to_sectors(UINT_MAX));
 	blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q);
 }
 
@@ -1520,7 +1520,7 @@ static int null_gendisk_register(struct nullb *nullb)
 	if (!disk)
 		return -ENOMEM;
 	size = (sector_t)nullb->dev->size * 1024 * 1024ULL;
-	set_capacity(disk, size >> 9);
+	set_capacity(disk, bytes_to_sectors(size));
 
 	disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
 	disk->major		= null_major;
-- 
2.16.4