block: Stop abusing csd.list for fifo_time

Block layer currently abuses rq->csd.list.next for storing fifo_time.
That is a terrible hack and completely unnecessary as well. Union
achieves the same space saving in a cleaner way.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 744833b630c6..5873e4ada9eb 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2367,10 +2367,10 @@ cfq_merged_requests(struct request_queue *q, struct request *rq,
          * reposition in fifo if next is older than rq
          */
         if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) &&
-            time_before(rq_fifo_time(next), rq_fifo_time(rq)) &&
+            time_before(next->fifo_time, rq->fifo_time) &&
             cfqq == RQ_CFQQ(next)) {
                 list_move(&rq->queuelist, &next->queuelist);
-                rq_set_fifo_time(rq, rq_fifo_time(next));
+                rq->fifo_time = next->fifo_time;
         }
 
         if (cfqq->next_rq == next)
@@ -2814,7 +2814,7 @@ static struct request *cfq_check_fifo(struct cfq_queue *cfqq)
                 return NULL;
 
         rq = rq_entry_fifo(cfqq->fifo.next);
-        if (time_before(jiffies, rq_fifo_time(rq)))
+        if (time_before(jiffies, rq->fifo_time))
                 rq = NULL;
 
         cfq_log_cfqq(cfqq->cfqd, cfqq, "fifo=%p", rq);
@@ -3927,7 +3927,7 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
         cfq_log_cfqq(cfqd, cfqq, "insert_request");
         cfq_init_prio_data(cfqq, RQ_CIC(rq));
 
-        rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]);
+        rq->fifo_time = jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)];
         list_add_tail(&rq->queuelist, &cfqq->fifo);
         cfq_add_rq_rb(rq);
         cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group,