[BLOCK] update SCSI to use new blk_ordered for barriers

All ordered request related stuff delegated to HLD.  Midlayer
now doens't deal with ordered setting or prepare_flush
callback.  sd.c updated to deal with blk_queue_ordered
setting.  Currently, ordered tag isn't used as SCSI midlayer
cannot guarantee request ordering.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 0 insertions, 46 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 53551f1dfe2..7a38b101976 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -932,9 +932,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes,
         int sense_valid = 0;
         int sense_deferred = 0;
 
-        if (blk_complete_barrier_rq(q, req, good_bytes >> 9))
-                return;
-
         /*
          * Free up any indirection buffers we allocated for DMA purposes. 
          * For the case of a READ, we need to copy the data out of the
@@ -1199,38 +1196,6 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
         return BLKPREP_KILL;
 }
 
-static int scsi_prepare_flush_fn(request_queue_t *q, struct request *rq)
-{
-        struct scsi_device *sdev = q->queuedata;
-        struct scsi_driver *drv;
-
-        if (sdev->sdev_state == SDEV_RUNNING) {
-                drv = *(struct scsi_driver **) rq->rq_disk->private_data;
-
-                if (drv->prepare_flush)
-                        return drv->prepare_flush(q, rq);
-        }
-
-        return 0;
-}
-
-static void scsi_end_flush_fn(request_queue_t *q, struct request *rq)
-{
-        struct scsi_device *sdev = q->queuedata;
-        struct request *flush_rq = rq->end_io_data;
-        struct scsi_driver *drv;
-
-        if (flush_rq->errors) {
-                printk("scsi: barrier error, disabling flush support\n");
-                blk_queue_ordered(q, QUEUE_ORDERED_NONE);
-        }
-
-        if (sdev->sdev_state == SDEV_RUNNING) {
-                drv = *(struct scsi_driver **) rq->rq_disk->private_data;
-                drv->end_flush(q, rq);
-        }
-}
-
 static int scsi_issue_flush_fn(request_queue_t *q, struct gendisk *disk,
                                sector_t *error_sector)
 {
@@ -1703,17 +1668,6 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
         blk_queue_segment_boundary(q, shost->dma_boundary);
         blk_queue_issue_flush_fn(q, scsi_issue_flush_fn);
 
-        /*
-         * ordered tags are superior to flush ordering
-         */
-        if (shost->ordered_tag)
-                blk_queue_ordered(q, QUEUE_ORDERED_TAG);
-        else if (shost->ordered_flush) {
-                blk_queue_ordered(q, QUEUE_ORDERED_FLUSH);
-                q->prepare_flush_fn = scsi_prepare_flush_fn;
-                q->end_flush_fn = scsi_end_flush_fn;
-        }
-
         if (!shost->use_clustering)
                 clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
         return q;