[PATCH] Remove queue merging hooks

We have full flexibility of merging parameters now, so we can remove the
hooks that define back/front/request merge strategies. Nobody is using
them anymore.

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

3 files changed, 12 insertions, 17 deletions

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 71a78a7e42fd..433797934bd5 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1405,8 +1405,7 @@ static inline int ll_new_hw_segment(request_queue_t *q,
         return 1;
 }
 
-static int ll_back_merge_fn(request_queue_t *q, struct request *req, 
-                            struct bio *bio)
+int ll_back_merge_fn(request_queue_t *q, struct request *req, struct bio *bio)
 {
         unsigned short max_sectors;
         int len;
@@ -1442,6 +1441,7 @@ static int ll_back_merge_fn(request_queue_t *q, struct request *req,
 
         return ll_new_hw_segment(q, req, bio);
 }
+EXPORT_SYMBOL(ll_back_merge_fn);
 
 static int ll_front_merge_fn(request_queue_t *q, struct request *req, 
                              struct bio *bio)
@@ -1912,9 +1912,6 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
         }
 
         q->request_fn           = rfn;
-        q->back_merge_fn        = ll_back_merge_fn;
-        q->front_merge_fn       = ll_front_merge_fn;
-        q->merge_requests_fn    = ll_merge_requests_fn;
         q->prep_rq_fn           = NULL;
         q->unplug_fn            = generic_unplug_device;
         q->queue_flags          = (1 << QUEUE_FLAG_CLUSTER);
@@ -2371,7 +2368,7 @@ static int __blk_rq_map_user(request_queue_t *q, struct request *rq,
         spin_lock_irq(q->queue_lock);
         if (!rq->bio)
                 blk_rq_bio_prep(q, rq, bio);
-        else if (!q->back_merge_fn(q, rq, bio)) {
+        else if (!ll_back_merge_fn(q, rq, bio)) {
                 ret = -EINVAL;
                 spin_unlock_irq(q->queue_lock);
                 goto unmap_bio;
@@ -2820,7 +2817,7 @@ static int attempt_merge(request_queue_t *q, struct request *req,
          * will have updated segment counts, update sector
          * counts here.
          */
-        if (!q->merge_requests_fn(q, req, next))
+        if (!ll_merge_requests_fn(q, req, next))
                 return 0;
 
         /*
@@ -2937,7 +2934,7 @@ static int __make_request(request_queue_t *q, struct bio *bio)
                 case ELEVATOR_BACK_MERGE:
                         BUG_ON(!rq_mergeable(req));
 
-                        if (!q->back_merge_fn(q, req, bio))
+                        if (!ll_back_merge_fn(q, req, bio))
                                 break;
 
                         blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
@@ -2954,7 +2951,7 @@ static int __make_request(request_queue_t *q, struct bio *bio)
                 case ELEVATOR_FRONT_MERGE:
                         BUG_ON(!rq_mergeable(req));
 
-                        if (!q->front_merge_fn(q, req, bio))
+                        if (!ll_front_merge_fn(q, req, bio))
                                 break;
 
                         blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 41a2ea32a300..f02f48a882a9 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -265,7 +265,7 @@ static int scsi_merge_bio(struct request *rq, struct bio *bio)
 
         if (!rq->bio)
                 blk_rq_bio_prep(q, rq, bio);
-        else if (!q->back_merge_fn(q, rq, bio))
+        else if (!ll_back_merge_fn(q, rq, bio))
                 return -EINVAL;
         else {
                 rq->biotail->bi_next = bio;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ea330d7b46c0..0fa33017ec02 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -331,10 +331,6 @@ struct request_pm_state
 
 #include <linux/elevator.h>
 
-typedef int (merge_request_fn) (request_queue_t *, struct request *,
-                                struct bio *);
-typedef int (merge_requests_fn) (request_queue_t *, struct request *,
-                                 struct request *);
 typedef void (request_fn_proc) (request_queue_t *q);
 typedef int (make_request_fn) (request_queue_t *q, struct bio *bio);
 typedef int (prep_rq_fn) (request_queue_t *, struct request *);
@@ -376,9 +372,6 @@ struct request_queue
         struct request_list     rq;
 
         request_fn_proc         *request_fn;
-        merge_request_fn        *back_merge_fn;
-        merge_request_fn        *front_merge_fn;
-        merge_requests_fn       *merge_requests_fn;
         make_request_fn         *make_request_fn;
         prep_rq_fn              *prep_rq_fn;
         unplug_fn               *unplug_fn;
@@ -649,6 +642,11 @@ extern int sg_scsi_ioctl(struct file *, struct request_queue *,
                 struct gendisk *, struct scsi_ioctl_command __user *);
 
 /*
+ * Temporary export, until SCSI gets fixed up.
+ */
+extern int ll_back_merge_fn(request_queue_t *, struct request *, struct bio *);
+
+/*
  * A queue has just exitted congestion.  Note this in the global counter of
  * congested queues, and wake up anyone who was waiting for requests to be
  * put back.