[PATCH v4 02/11] md: factor out a helper raid_is_456()

[Yu Kuai]

From: Yu Kuai <yuku...@huawei.com>

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

Signed-off-by: Yu Kuai <yuku...@huawei.com>
Reviewed-by: Xiao Ni <x...@redhat.com>
Reviewed-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Hannes Reinecke <h...@suse.de>
---
 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 c4ef23ade9e2..1db7af64184d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9050,19 +9050,12 @@ 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 9e37c6c18722..72bce59376d7 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -1033,6 +1033,12 @@ 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)
 {
-- 
2.43.0