[PATCH 02/23] md: factor out a helper raid_is_456()

[Yu Kuai <yukuai1@huaweicloud.com>]

From: Yu Kuai <yukuai3@huawei.com>

There are no functional changes, the helper will be used by llbitmap in
following patches.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 drivers/md/md.c | 9 +--------
 drivers/md/md.h | 6 ++++++
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 18e03f651f6b..b0468e795d94 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9037,19 +9037,12 @@ static sector_t md_sync_position(struct mddev *mddev, enum sync_action action)
 
 static bool sync_io_within_limit(struct mddev *mddev)
 {
-	int io_sectors;
-
 	/*
 	 * For raid456, sync IO is stripe(4k) per IO, for other levels, it's
 	 * RESYNC_PAGES(64k) per IO.
 	 */
-	if (mddev->level == 4 || mddev->level == 5 || mddev->level == 6)
-		io_sectors = 8;
-	else
-		io_sectors = 128;
-
 	return atomic_read(&mddev->recovery_active) <
-		io_sectors * sync_io_depth(mddev);
+	       (raid_is_456(mddev) ? 8 : 128) * sync_io_depth(mddev);
 }
 
 #define SYNC_MARKS	10
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 5ba4a9093a92..c241119e6ef3 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -1011,6 +1011,12 @@ static inline bool mddev_is_dm(struct mddev *mddev)
 	return !mddev->gendisk;
 }
 
+static inline bool raid_is_456(struct mddev *mddev)
+{
+	return mddev->level == ID_RAID4 || mddev->level == ID_RAID5 ||
+	       mddev->level == ID_RAID6;
+}
+
 static inline void mddev_trace_remap(struct mddev *mddev, struct bio *bio,
 		sector_t sector)
 {
-- 
2.39.2