[RFC PATCH 04/11] block: Expedite DMPG and SWAPIN requests ahead of the queue

[Venkatraman S]

From: Ilan Smith <ilan.sm...@sandisk.com>

When expedite_swapin and expedite_dmpg are set, move the
requests ahead of the queue.

Signed-off-by: Ilan Smith <ilan.sm...@sandisk.com>
Signed-off-by: Alex Lemberg <alex.lemb...@sandisk.com>
Signed-off-by: Venkatraman S <svenk...@ti.com>
---
 block/blk-core.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/block/blk-core.c b/block/blk-core.c
index 3a78b00..0b54ee9 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1305,6 +1305,12 @@ void init_request_from_bio(struct request *req, struct 
bio *bio)
        if (bio->bi_rw & REQ_RAHEAD)
                req->cmd_flags |= REQ_FAILFAST_MASK;
 
+       if (bio_swapin(bio) && blk_queue_exp_swapin(req->q))
+               req->cmd_flags |= REQ_RW_SWAPIN;
+
+       if (bio_dmpg(bio) && blk_queue_exp_dmpg(req->q))
+               req->cmd_flags |= REQ_RW_DMPG;
+
        req->errors = 0;
        req->__sector = bio->bi_sector;
        req->ioprio = bio_prio(bio);
@@ -1332,6 +1338,18 @@ void blk_queue_bio(struct request_queue *q, struct bio 
*bio)
                goto get_rq;
        }
 
+       if (bio_swapin(bio) && blk_queue_exp_swapin(q)) {
+               spin_lock_irq(q->queue_lock);
+               where = ELEVATOR_INSERT_FRONT;
+               goto get_rq;
+       }
+
+       if (bio_dmpg(bio) && blk_queue_exp_dmpg(q)) {
+               spin_lock_irq(q->queue_lock);
+               where = ELEVATOR_INSERT_FRONT;
+               goto get_rq;
+       }
+
        /*
         * Check if we can merge with the plugged list before grabbing
         * any locks.
-- 
1.7.10.rc2

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