[PATCH v2 04/28] block: Introduce bio_straddle_zones() and bio_offset_from_zone_start()

Damien Le Moal
2024-03-25T04:45:01Z

Implement the inline helper functions bio_straddle_zones() and
bio_offset_from_zone_start() to respectively test if a BIO crosses a
zone boundary (the start sector and last sector belong to different
zones) and to obtain the offset of a BIO from the start sector of its
target zone.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
include/linux/blkdev.h | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index c3e8f7cf96be..93f93f352b54 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -853,6 +853,13 @@ static inline unsigned int bio_zone_no(struct bio *bio)
return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
}

+static inline bool bio_straddle_zones(struct bio *bio)
+{
+ return bio_sectors(bio) &&
+ bio_zone_no(bio) !=
+ disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1);
+}
+
static inline unsigned int bio_zone_is_seq(struct bio *bio)
{
return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
@@ -1328,6 +1335,12 @@ static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,
return sector & (bdev_zone_sectors(bdev) - 1);
}

+static inline sector_t bio_offset_from_zone_start(struct bio *bio)
+{
+ return bdev_offset_from_zone_start(bio->bi_bdev,
+ bio->bi_iter.bi_sector);
+}
+
static inline bool bdev_is_zone_start(struct block_device *bdev,
sector_t sector)
{
--
2.44.0