Revert "block: fix accounting bug on cross partition merges"

This reverts commit 7681bfeeccff5efa9eb29bf09249a3c400b15327.

Conflicts:

	include/linux/genhd.h

It has numerous issues with the cleanup path and non-elevator
devices. Revert it for now so we can come up with a clean
version without rushing things.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 8 insertions, 16 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 51efd835d4cf..f8548876d7ea 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -64,15 +64,13 @@ static void drive_stat_acct(struct request *rq, int new_io)
                 return;
 
         cpu = part_stat_lock();
+        part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
 
-        if (!new_io) {
-                part = rq->part;
+        if (!new_io)
                 part_stat_inc(cpu, part, merges[rw]);
-        } else {
-                part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
+        else {
                 part_round_stats(cpu, part);
                 part_inc_in_flight(part, rw);
-                rq->part = part;
         }
 
         part_stat_unlock();
@@ -130,7 +128,6 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
         rq->ref_count = 1;
         rq->start_time = jiffies;
         set_start_time_ns(rq);
-        rq->part = NULL;
 }
 EXPORT_SYMBOL(blk_rq_init);
 
@@ -805,16 +802,11 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
         rl->starved[is_sync] = 0;
 
         priv = !test_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags);
-        if (priv) {
+        if (priv)
                 rl->elvpriv++;
 
-                /*
-                 * Don't do stats for non-priv requests
-                 */
-                if (blk_queue_io_stat(q))
-                        rw_flags |= REQ_IO_STAT;
-        }
-
+        if (blk_queue_io_stat(q))
+                rw_flags |= REQ_IO_STAT;
         spin_unlock_irq(q->queue_lock);
 
         rq = blk_alloc_request(q, rw_flags, priv, gfp_mask);
@@ -1791,7 +1783,7 @@ static void blk_account_io_completion(struct request *req, unsigned int bytes)
                 int cpu;
 
                 cpu = part_stat_lock();
-                part = req->part;
+                part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
                 part_stat_add(cpu, part, sectors[rw], bytes >> 9);
                 part_stat_unlock();
         }
@@ -1811,7 +1803,7 @@ static void blk_account_io_done(struct request *req)
                 int cpu;
 
                 cpu = part_stat_lock();
-                part = req->part;
+                part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
 
                 part_stat_inc(cpu, part, ios[rw]);
                 part_stat_add(cpu, part, ticks[rw], duration);