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authorMichael Callahan2018-07-18 04:47:37 -0700
committerJens Axboe2018-07-18 08:44:16 -0600
commit59767fbd49d794b4499d30b314df6c0d4aca584b (patch)
treec9c02d6336a9408343a08065a032745740e898b2 /drivers/md
parent3f289dcb4b265416a57ca79cf4a324060bb09060 (diff)
block: Add part_stat_read_accum to read across field entries.
Add a part_stat_read_accum macro to genhd.h to read and sum across field entries. For example to sum up the number read and write sectors completed. In addition to being ar reasonable cleanup by itself this will make it easier to add new stat fields in the future. tj: Refreshed on top of v4.17. Signed-off-by: Michael Callahan <michaelcallahan@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 994aed2f9dff..dabe36723d60 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8046,8 +8046,7 @@ static int is_mddev_idle(struct mddev *mddev, int init)
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
- curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
- (int)part_stat_read(&disk->part0, sectors[1]) -
+ curr_events = (int)part_stat_read_accum(&disk->part0, sectors) -
atomic_read(&disk->sync_io);
/* sync IO will cause sync_io to increase before the disk_stats
* as sync_io is counted when a request starts, and