[BLOCK] Unify the seperate read/write io stat fields into arrays

Instead of having ->read_sectors and ->write_sectors, combine the two
into ->sectors[2] and similar for the other fields. This saves a branch
several places in the io path, since we don't have to care for what the
actual io direction is. On my x86-64 box, that's 200 bytes less text in
just the core (not counting the various drivers).

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2a8a5696bf8a..9ecf51ee596f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3466,8 +3466,8 @@ static int is_mddev_idle(mddev_t *mddev)
         idle = 1;
         ITERATE_RDEV(mddev,rdev,tmp) {
                 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
-                curr_events = disk_stat_read(disk, read_sectors) + 
-                                disk_stat_read(disk, write_sectors) - 
+                curr_events = disk_stat_read(disk, sectors[0]) + 
+                                disk_stat_read(disk, sectors[1]) - 
                                 atomic_read(&disk->sync_io);
                 /* Allow some slack between valud of curr_events and last_events,
                  * as there are some uninteresting races.