blk-wbt: use BLK_STAT_{READ,WRITE} instead of 0/1

Since we have proper enums for the stats directions, use them.

Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index f6ec7e587fa6..20712f0db6ea 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -255,8 +255,8 @@ static bool inline stat_sample_valid(struct blk_rq_stat *stat)
          * that it's writes impacting us, and not just some sole read on
          * a device that is in a lower power state.
          */
-        return stat[0].nr_samples >= 1 &&
-                stat[1].nr_samples >= RWB_MIN_WRITE_SAMPLES;
+        return stat[BLK_STAT_READ].nr_samples >= 1 &&
+                stat[BLK_STAT_WRITE].nr_samples >= RWB_MIN_WRITE_SAMPLES;
 }
 
 static u64 rwb_sync_issue_lat(struct rq_wb *rwb)
@@ -293,7 +293,7 @@ static int __latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)
          */
         thislat = rwb_sync_issue_lat(rwb);
         if (thislat > rwb->cur_win_nsec ||
-            (thislat > rwb->min_lat_nsec && !stat[0].nr_samples)) {
+            (thislat > rwb->min_lat_nsec && !stat[BLK_STAT_READ].nr_samples)) {
                 trace_wbt_lat(bdi, thislat);
                 return LAT_EXCEEDED;
         }
@@ -308,7 +308,7 @@ static int __latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)
                  * waited or still has writes in flights, consider us doing
                  * just writes as well.
                  */
-                if ((stat[1].nr_samples && blk_stat_is_current(stat)) ||
+                if ((stat[BLK_STAT_WRITE].nr_samples && blk_stat_is_current(stat)) ||
                     wb_recent_wait(rwb) || wbt_inflight(rwb))
                         return LAT_UNKNOWN_WRITES;
                 return LAT_UNKNOWN;
@@ -317,8 +317,8 @@ static int __latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)
         /*
          * If the 'min' latency exceeds our target, step down.
          */
-        if (stat[0].min > rwb->min_lat_nsec) {
-                trace_wbt_lat(bdi, stat[0].min);
+        if (stat[BLK_STAT_READ].min > rwb->min_lat_nsec) {
+                trace_wbt_lat(bdi, stat[BLK_STAT_READ].min);
                 trace_wbt_stat(bdi, stat);
                 return LAT_EXCEEDED;
         }