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SubjectRe: [RFC PATCH 2/2] null_blk: Make use of size_to_sectors helper
Date
Looks good.

Reviewed-by : Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>

On 04/20/2019 08:54 PM, Marcos Paulo de Souza wrote:
> 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.
>
> Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
> ---
> 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..05f0bef54296 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 += (size_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 += size_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 += size_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 += size_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 += size_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 += size_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 = size_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, size_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, size_to_sectors(size));
>
> disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
> disk->major = null_major;
>


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