[PATCH v4 05/13] block: refactor bdev_zone_is_seq()

Define the helper function disk_zone_is_seq() and use it to refactor
bdev_zone_is_seq(). disk_zone_is_seq() is also used in
blk_zone_wplug_handle_write().

Signed-off-by: Damien Le Moal <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
---
 block/blk-zoned.c | 38 +++++++++++++++++++++++++-------------
 1 file changed, 25 insertions(+), 13 deletions(-)

diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 7d17f7f7ae95..e3c28db5690c 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -261,6 +261,29 @@ static void disk_zone_set_cond(struct gendisk *disk, sector_t sector,
 	rcu_read_unlock();
 }
 
+static inline u8 disk_zone_get_state(struct gendisk *disk, sector_t sector)
+{
+	unsigned int zno = disk_zone_no(disk, sector);
+	u8 *zones_state, zs;
+
+	rcu_read_lock();
+	zones_state = rcu_dereference(disk->zones_state);
+	if (likely(zones_state && zno < disk->nr_zones))
+		zs = zones_state[zno];
+	else
+		zs = BLK_ZFLAG_CONV;
+	rcu_read_unlock();
+
+	return zs;
+}
+
+static bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
+{
+	u8 zs = disk_zone_get_state(disk, sector);
+
+	return !blk_zstate_is_conv(zs);
+}
+
 /**
  * bdev_zone_is_seq - check if a sector belongs to a sequential write zone
  * @bdev:       block device to check
@@ -270,21 +293,10 @@ static void disk_zone_set_cond(struct gendisk *disk, sector_t sector,
  */
 bool bdev_zone_is_seq(struct block_device *bdev, sector_t sector)
 {
-	struct gendisk *disk = bdev->bd_disk;
-	unsigned int zno = disk_zone_no(disk, sector);
-	bool is_seq = false;
-	u8 *zones_state;
-
 	if (!bdev_is_zoned(bdev))
 		return false;
 
-	rcu_read_lock();
-	zones_state = rcu_dereference(disk->zones_state);
-	if (zones_state && zno < disk->nr_zones)
-		is_seq = !blk_zstate_is_conv(zones_state[zno]);
-	rcu_read_unlock();
-
-	return is_seq;
+	return disk_zone_is_seq(bdev->bd_disk, sector);
 }
 EXPORT_SYMBOL_GPL(bdev_zone_is_seq);
 
@@ -1522,7 +1534,7 @@ static bool blk_zone_wplug_handle_write(struct bio *bio, unsigned int nr_segs)
 	}
 
 	/* Conventional zones do not need write plugging. */
-	if (!bdev_zone_is_seq(bio->bi_bdev, sector)) {
+	if (!disk_zone_is_seq(disk, sector)) {
 		/* Zone append to conventional zones is not allowed. */
 		if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
 			bio_io_error(bio);
-- 
2.55.0