block: Consolidate phys_segment and hw_segment limits

Except for SCSI no device drivers distinguish between physical and
hardware segment limits.  Consolidate the two into a single segment
limit.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

4 files changed, 7 insertions, 10 deletions

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 87b536a..732f6d3 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -4195,7 +4195,7 @@ static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
 		if (tgt->service_parms.class3_parms[0] & 0x80000000)
 			rport->supported_classes |= FC_COS_CLASS3;
 		if (rport->rqst_q)
-			blk_queue_max_hw_segments(rport->rqst_q, 1);
+			blk_queue_max_segments(rport->rqst_q, 1);
 	} else
 		tgt_dbg(tgt, "rport add failed\n");
 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
@@ -4669,7 +4669,7 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	}
 
 	if (shost_to_fc_host(shost)->rqst_q)
-		blk_queue_max_hw_segments(shost_to_fc_host(shost)->rqst_q, 1);
+		blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
 	dev_set_drvdata(dev, vhost);
 	spin_lock(&ibmvfc_driver_lock);
 	list_add_tail(&vhost->queue, &ibmvfc_head);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ac3cca7..f8fbf47 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1624,8 +1624,8 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
 	/*
 	 * this limit is imposed by hardware restrictions
 	 */
-	blk_queue_max_hw_segments(q, shost->sg_tablesize);
-	blk_queue_max_phys_segments(q, SCSI_MAX_SG_CHAIN_SEGMENTS);
+	blk_queue_max_segments(q, min_t(unsigned short, shost->sg_tablesize,
+					SCSI_MAX_SG_CHAIN_SEGMENTS));
 
 	blk_queue_max_hw_sectors(q, shost->max_sectors);
 	blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 040f751..c996d98 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -287,8 +287,7 @@ sg_open(struct inode *inode, struct file *filp)
 	if (list_empty(&sdp->sfds)) {	/* no existing opens on this device */
 		sdp->sgdebug = 0;
 		q = sdp->device->request_queue;
-		sdp->sg_tablesize = min(queue_max_hw_segments(q),
-					queue_max_phys_segments(q));
+		sdp->sg_tablesize = queue_max_segments(q);
 	}
 	if ((sfp = sg_add_sfp(sdp, dev)))
 		filp->private_data = sfp;
@@ -1376,8 +1375,7 @@ static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
 	sdp->device = scsidp;
 	INIT_LIST_HEAD(&sdp->sfds);
 	init_waitqueue_head(&sdp->o_excl_wait);
-	sdp->sg_tablesize = min(queue_max_hw_segments(q),
-				queue_max_phys_segments(q));
+	sdp->sg_tablesize = queue_max_segments(q);
 	sdp->index = k;
 	kref_init(&sdp->d_ref);
 
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index d04ea9a..f67d1a1 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -3983,8 +3983,7 @@ static int st_probe(struct device *dev)
 		return -ENODEV;
 	}
 
-	i = min(queue_max_hw_segments(SDp->request_queue),
-		queue_max_phys_segments(SDp->request_queue));
+	i = queue_max_segments(SDp->request_queue);
 	if (st_max_sg_segs < i)
 		i = st_max_sg_segs;
 	buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);