cfq: Remove special treatment for metadata rqs.

There is no consistency among filesystems from what bios (or requests)
are marked as being metadata. It's interesting to expose this in traces,
but we shouldn't schedule the requests differently based on whether or
not they're marked as being metadata.

Signed-off-by: Justin TerAvest <teravest@google.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index b2e1c75e4fbe2eaea814c99909690ca193a5388d..762bd509b71b4008d3cc00d33bf78dc0a1917baf 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -129,8 +129,6 @@ struct cfq_queue {
        unsigned long slice_end;
        long slice_resid;
 
-       /* pending metadata requests */
-       int meta_pending;
        /* number of requests that are on the dispatch list or inside driver */
        int dispatched;
 
@@ -670,9 +668,6 @@ cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2,
        if (rq_is_sync(rq1) != rq_is_sync(rq2))
                return rq_is_sync(rq1) ? rq1 : rq2;
 
-       if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_META)
-               return rq1->cmd_flags & REQ_META ? rq1 : rq2;
-
        s1 = blk_rq_pos(rq1);
        s2 = blk_rq_pos(rq2);
 
@@ -1593,10 +1588,6 @@ static void cfq_remove_request(struct request *rq)
        cfqq->cfqd->rq_queued--;
        cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
                                        rq_data_dir(rq), rq_is_sync(rq));
-       if (rq->cmd_flags & REQ_META) {
-               WARN_ON(!cfqq->meta_pending);
-               cfqq->meta_pending--;
-       }
 }
 
 static int cfq_merge(struct request_queue *q, struct request **req,
@@ -3334,13 +3325,6 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
            RB_EMPTY_ROOT(&cfqq->sort_list))
                return true;
 
-       /*
-        * So both queues are sync. Let the new request get disk time if
-        * it's a metadata request and the current queue is doing regular IO.
-        */
-       if ((rq->cmd_flags & REQ_META) && !cfqq->meta_pending)
-               return true;
-
        /*
         * Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice.
         */
@@ -3405,8 +3389,6 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
        struct cfq_io_context *cic = RQ_CIC(rq);
 
        cfqd->rq_queued++;
-       if (rq->cmd_flags & REQ_META)
-               cfqq->meta_pending++;
 
        cfq_update_io_thinktime(cfqd, cic);
        cfq_update_io_seektime(cfqd, cfqq, rq);