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>

35 files changed, 70 insertions, 136 deletions

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index c2051b0737cb..c1ff6903b622 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -849,7 +849,7 @@ static int ubd_add(int n, char **error_out)
         }
         ubd_dev->queue->queuedata = ubd_dev;
 
-        blk_queue_max_hw_segments(ubd_dev->queue, MAX_SG);
+        blk_queue_max_segments(ubd_dev->queue, MAX_SG);
         err = ubd_disk_register(UBD_MAJOR, ubd_dev->size, n, &ubd_gendisk[n]);
         if(err){
                 *error_out = "Failed to register device";
diff --git a/block/blk-core.c b/block/blk-core.c
index 36c0deebc2dc..9fe174dc74d1 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1614,8 +1614,7 @@ int blk_rq_check_limits(struct request_queue *q, struct request *rq)
          * limitation.
          */
         blk_recalc_rq_segments(rq);
-        if (rq->nr_phys_segments > queue_max_phys_segments(q) ||
-            rq->nr_phys_segments > queue_max_hw_segments(q)) {
+        if (rq->nr_phys_segments > queue_max_segments(q)) {
                 printk(KERN_ERR "%s: over max segments limit.\n", __func__);
                 return -EIO;
         }
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 99cb5cf1f447..5e7dc9973458 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -206,8 +206,7 @@ static inline int ll_new_hw_segment(struct request_queue *q,
 {
         int nr_phys_segs = bio_phys_segments(q, bio);
 
-        if (req->nr_phys_segments + nr_phys_segs > queue_max_hw_segments(q) ||
-            req->nr_phys_segments + nr_phys_segs > queue_max_phys_segments(q)) {
+        if (req->nr_phys_segments + nr_phys_segs > queue_max_segments(q)) {
                 req->cmd_flags |= REQ_NOMERGE;
                 if (req == q->last_merge)
                         q->last_merge = NULL;
@@ -300,10 +299,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
                 total_phys_segments--;
         }
 
-        if (total_phys_segments > queue_max_phys_segments(q))
-                return 0;
-
-        if (total_phys_segments > queue_max_hw_segments(q))
+        if (total_phys_segments > queue_max_segments(q))
                 return 0;
 
         /* Merge is OK... */
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 61afae9dbc6d..31e7a9375c13 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -91,8 +91,7 @@ EXPORT_SYMBOL_GPL(blk_queue_lld_busy);
  */
 void blk_set_default_limits(struct queue_limits *lim)
 {
-        lim->max_phys_segments = MAX_PHYS_SEGMENTS;
-        lim->max_hw_segments = MAX_HW_SEGMENTS;
+        lim->max_segments = BLK_MAX_SEGMENTS;
         lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
         lim->max_segment_size = BLK_MAX_SEGMENT_SIZE;
         lim->max_sectors = BLK_DEF_MAX_SECTORS;
@@ -252,17 +251,15 @@ void blk_queue_max_discard_sectors(struct request_queue *q,
 EXPORT_SYMBOL(blk_queue_max_discard_sectors);
 
 /**
- * blk_queue_max_phys_segments - set max phys segments for a request for this queue
+ * blk_queue_max_segments - set max hw segments for a request for this queue
  * @q:  the request queue for the device
  * @max_segments:  max number of segments
  *
  * Description:
  *    Enables a low level driver to set an upper limit on the number of
- *    physical data segments in a request.  This would be the largest sized
- *    scatter list the driver could handle.
+ *    hw data segments in a request.
  **/
-void blk_queue_max_phys_segments(struct request_queue *q,
-                                 unsigned short max_segments)
+void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
 {
         if (!max_segments) {
                 max_segments = 1;
@@ -270,33 +267,9 @@ void blk_queue_max_phys_segments(struct request_queue *q,
                        __func__, max_segments);
         }
 
-        q->limits.max_phys_segments = max_segments;
+        q->limits.max_segments = max_segments;
 }
-EXPORT_SYMBOL(blk_queue_max_phys_segments);
-
-/**
- * blk_queue_max_hw_segments - set max hw segments for a request for this queue
- * @q:  the request queue for the device
- * @max_segments:  max number of segments
- *
- * Description:
- *    Enables a low level driver to set an upper limit on the number of
- *    hw data segments in a request.  This would be the largest number of
- *    address/length pairs the host adapter can actually give at once
- *    to the device.
- **/
-void blk_queue_max_hw_segments(struct request_queue *q,
-                               unsigned short max_segments)
-{
-        if (!max_segments) {
-                max_segments = 1;
-                printk(KERN_INFO "%s: set to minimum %d\n",
-                       __func__, max_segments);
-        }
-
-        q->limits.max_hw_segments = max_segments;
-}
-EXPORT_SYMBOL(blk_queue_max_hw_segments);
+EXPORT_SYMBOL(blk_queue_max_segments);
 
 /**
  * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg
@@ -531,11 +504,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
         t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask,
                                             b->seg_boundary_mask);
 
-        t->max_phys_segments = min_not_zero(t->max_phys_segments,
-                                            b->max_phys_segments);
-
-        t->max_hw_segments = min_not_zero(t->max_hw_segments,
-                                          b->max_hw_segments);
+        t->max_segments = min_not_zero(t->max_segments, b->max_segments);
 
         t->max_segment_size = min_not_zero(t->max_segment_size,
                                            b->max_segment_size);
@@ -739,22 +708,19 @@ EXPORT_SYMBOL(blk_queue_update_dma_pad);
  * does is adjust the queue so that the buf is always appended
  * silently to the scatterlist.
  *
- * Note: This routine adjusts max_hw_segments to make room for
- * appending the drain buffer.  If you call
- * blk_queue_max_hw_segments() or blk_queue_max_phys_segments() after
- * calling this routine, you must set the limit to one fewer than your
- * device can support otherwise there won't be room for the drain
- * buffer.
+ * Note: This routine adjusts max_hw_segments to make room for appending
+ * the drain buffer.  If you call blk_queue_max_segments() after calling
+ * this routine, you must set the limit to one fewer than your device
+ * can support otherwise there won't be room for the drain buffer.
  */
 int blk_queue_dma_drain(struct request_queue *q,
                                dma_drain_needed_fn *dma_drain_needed,
                                void *buf, unsigned int size)
 {
-        if (queue_max_hw_segments(q) < 2 || queue_max_phys_segments(q) < 2)
+        if (queue_max_segments(q) < 2)
                 return -EINVAL;
         /* make room for appending the drain */
-        blk_queue_max_hw_segments(q, queue_max_hw_segments(q) - 1);
-        blk_queue_max_phys_segments(q, queue_max_phys_segments(q) - 1);
+        blk_queue_max_segments(q, queue_max_segments(q) - 1);
         q->dma_drain_needed = dma_drain_needed;
         q->dma_drain_buffer = buf;
         q->dma_drain_size = size;
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 0c82d335c55d..684fe04dbbb7 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -772,7 +772,7 @@ static int nv_adma_slave_config(struct scsi_device *sdev)
         }
 
         blk_queue_segment_boundary(sdev->request_queue, segment_boundary);
-        blk_queue_max_hw_segments(sdev->request_queue, sg_tablesize);
+        blk_queue_max_segments(sdev->request_queue, sg_tablesize);
         ata_port_printk(ap, KERN_INFO,
                 "DMA mask 0x%llX, segment boundary 0x%lX, hw segs %hu\n",
                 (unsigned long long)*ap->host->dev->dma_mask,
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index 1c0cd35e1913..459f1bc25a7b 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -2534,7 +2534,7 @@ static bool DAC960_RegisterBlockDevice(DAC960_Controller_T *Controller)
         blk_queue_bounce_limit(RequestQueue, Controller->BounceBufferLimit);
         RequestQueue->queuedata = Controller;
         blk_queue_max_hw_segments(RequestQueue, Controller->DriverScatterGatherLimit);
-        blk_queue_max_phys_segments(RequestQueue, Controller->DriverScatterGatherLimit);
+        blk_queue_max_segments(RequestQueue, Controller->DriverScatterGatherLimit);
         blk_queue_max_hw_sectors(RequestQueue, Controller->MaxBlocksPerCommand);
         disk->queue = RequestQueue;
         sprintf(disk->disk_name, "rd/c%dd%d", Controller->ControllerNumber, n);
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 030e52d72254..a29e69418a03 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1797,10 +1797,7 @@ static int cciss_add_disk(ctlr_info_t *h, struct gendisk *disk,
         blk_queue_bounce_limit(disk->queue, h->pdev->dma_mask);
 
         /* This is a hardware imposed limit. */
-        blk_queue_max_hw_segments(disk->queue, h->maxsgentries);
-
-        /* This is a limit in the driver and could be eliminated. */
-        blk_queue_max_phys_segments(disk->queue, h->maxsgentries);
+        blk_queue_max_segments(disk->queue, h->maxsgentries);
 
         blk_queue_max_hw_sectors(disk->queue, h->cciss_max_sectors);
 
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index 6422651ec364..91d11631cec9 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -448,11 +448,8 @@ static int __init cpqarray_register_ctlr( int i, struct pci_dev *pdev)
                 blk_queue_bounce_limit(q, hba[i]->pci_dev->dma_mask);
 
         /* This is a hardware imposed limit. */
-        blk_queue_max_hw_segments(q, SG_MAX);
+        blk_queue_max_segments(q, SG_MAX);
 
-        /* This is a driver limit and could be eliminated. */
-        blk_queue_max_phys_segments(q, SG_MAX);
-        
         init_timer(&hba[i]->timer);
         hba[i]->timer.expires = jiffies + IDA_TIMER;
         hba[i]->timer.data = (unsigned long)hba[i];
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 9b55e64196fc..4df3b40b1057 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -710,8 +710,7 @@ void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __mu
         max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
 
         blk_queue_max_hw_sectors(q, max_seg_s >> 9);
-        blk_queue_max_phys_segments(q, max_segments ? max_segments : MAX_PHYS_SEGMENTS);
-        blk_queue_max_hw_segments(q, max_segments ? max_segments : MAX_HW_SEGMENTS);
+        blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
         blk_queue_max_segment_size(q, max_seg_s);
         blk_queue_logical_block_size(q, 512);
         blk_queue_segment_boundary(q, PAGE_SIZE-1);
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index ea54ea393553..ddb4f9abd480 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -956,8 +956,7 @@ static int __init pf_init(void)
                 return -ENOMEM;
         }
 
-        blk_queue_max_phys_segments(pf_queue, cluster);
-        blk_queue_max_hw_segments(pf_queue, cluster);
+        blk_queue_max_segments(pf_queue, cluster);
 
         for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
                 struct gendisk *disk = pf->disk;
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 6e1daa24da2f..b72935b8f203 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -950,14 +950,14 @@ static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
 static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
 {
         if ((pd->settings.size << 9) / CD_FRAMESIZE
-            <= queue_max_phys_segments(q)) {
+            <= queue_max_segments(q)) {
                 /*
                  * The cdrom device can handle one segment/frame
                  */
                 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
                 return 0;
         } else if ((pd->settings.size << 9) / PAGE_SIZE
-                   <= queue_max_phys_segments(q)) {
+                   <= queue_max_segments(q)) {
                 /*
                  * We can handle this case at the expense of some extra memory
                  * copies during write operations
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index 9cd1a4a542b8..bc95469d33c1 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -482,8 +482,7 @@ static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
         blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
                           ps3disk_prepare_flush);
 
-        blk_queue_max_phys_segments(queue, -1);
-        blk_queue_max_hw_segments(queue, -1);
+        blk_queue_max_segments(queue, -1);
         blk_queue_max_segment_size(queue, dev->bounce_size);
 
         gendisk = alloc_disk(PS3DISK_MINORS);
diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c
index 6416b262934b..83ebb390b164 100644
--- a/drivers/block/ps3vram.c
+++ b/drivers/block/ps3vram.c
@@ -751,8 +751,7 @@ static int __devinit ps3vram_probe(struct ps3_system_bus_device *dev)
         priv->queue = queue;
         queue->queuedata = dev;
         blk_queue_make_request(queue, ps3vram_make_request);
-        blk_queue_max_phys_segments(queue, MAX_PHYS_SEGMENTS);
-        blk_queue_max_hw_segments(queue, MAX_HW_SEGMENTS);
+        blk_queue_max_segments(queue, BLK_MAX_HW_SEGMENTS);
         blk_queue_max_segment_size(queue, BLK_MAX_SEGMENT_SIZE);
         blk_queue_max_hw_sectors(queue, BLK_SAFE_MAX_SECTORS);
 
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index dd30cddd0f7f..48e8fee9f2d4 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -691,8 +691,7 @@ static int probe_disk(struct vdc_port *port)
 
         port->disk = g;
 
-        blk_queue_max_hw_segments(q, port->ring_cookies);
-        blk_queue_max_phys_segments(q, port->ring_cookies);
+        blk_queue_max_segments(q, port->ring_cookies);
         blk_queue_max_hw_sectors(q, port->max_xfer_size);
         g->major = vdc_major;
         g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index 7bd7b2f83116..b70f0fca9a42 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -1518,8 +1518,7 @@ static int carm_init_disks(struct carm_host *host)
                         break;
                 }
                 disk->queue = q;
-                blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
-                blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
+                blk_queue_max_segments(q, CARM_MAX_REQ_SG);
                 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
 
                 q->queuedata = port;
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 352ea24d66e8..2e889838e819 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -2320,8 +2320,7 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
         disk->queue = q;
 
         blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
-        blk_queue_max_hw_segments(q, UB_MAX_REQ_SG);
-        blk_queue_max_phys_segments(q, UB_MAX_REQ_SG);
+        blk_queue_max_segments(q, UB_MAX_REQ_SG);
         blk_queue_segment_boundary(q, 0xffffffff);      /* Dubious. */
         blk_queue_max_hw_sectors(q, UB_MAX_SECTORS);
         blk_queue_logical_block_size(q, lun->capacity.bsize);
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index d44ece7d7b7c..c12b31362ac6 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -471,8 +471,7 @@ retry:
         }
 
         d->disk = g;
-        blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA);
-        blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA);
+        blk_queue_max_segments(q, VIOMAXBLOCKDMA);
         blk_queue_max_hw_sectors(q, VIODASD_MAXSECTORS);
         g->major = VIODASD_MAJOR;
         g->first_minor = dev_no << PARTITION_SHIFT;
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index f9861aaa1fef..9c09694b2520 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -353,8 +353,7 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
         blk_queue_max_segment_size(rq, PAGE_SIZE);
 
         /* Ensure a merged request will fit in a single I/O ring slot. */
-        blk_queue_max_phys_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST);
-        blk_queue_max_hw_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST);
+        blk_queue_max_segments(rq, BLKIF_MAX_SEGMENTS_PER_REQUEST);
 
         /* Make sure buffer addresses are sector-aligned. */
         blk_queue_dma_alignment(rq, 511);
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index e789e6c9a422..03c71f7698cb 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -741,7 +741,7 @@ static int __devinit probe_gdrom_setupqueue(void)
 {
         blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
         /* using DMA so memory will need to be contiguous */
-        blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+        blk_queue_max_segments(gd.gdrom_rq, 1);
         /* set a large max size to get most from DMA */
         blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
         gd.disk->queue = gd.gdrom_rq;
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index b1dfd23eb832..cc435be0bc13 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -616,8 +616,7 @@ static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
         gendisk->first_minor = deviceno;
         strncpy(gendisk->disk_name, c->name,
                         sizeof(gendisk->disk_name));
-        blk_queue_max_hw_segments(q, 1);
-        blk_queue_max_phys_segments(q, 1);
+        blk_queue_max_segments(q, 1);
         blk_queue_max_hw_sectors(q, 4096 / 512);
         gendisk->queue = q;
         gendisk->fops = &viocd_fops;
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 1ec8b31277bd..f8c1ae6ad74c 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -790,8 +790,7 @@ static int ide_init_queue(ide_drive_t *drive)
                 max_sg_entries >>= 1;
 #endif /* CONFIG_PCI */
 
-        blk_queue_max_hw_segments(q, max_sg_entries);
-        blk_queue_max_phys_segments(q, max_sg_entries);
+        blk_queue_max_segments(q, max_sg_entries);
 
         /* assign drive queue */
         drive->queue = q;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ceb24afdc147..509c8f3dd9a5 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3739,7 +3739,7 @@ static int bio_fits_rdev(struct bio *bi)
         if ((bi->bi_size>>9) > queue_max_sectors(q))
                 return 0;
         blk_recount_segments(q, bi);
-        if (bi->bi_phys_segments > queue_max_phys_segments(q))
+        if (bi->bi_phys_segments > queue_max_segments(q))
                 return 0;
 
         if (q->merge_bvec_fn)
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 44d4178c4c15..972b87069d55 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -1227,8 +1227,7 @@ static int mspro_block_init_disk(struct memstick_dev *card)
 
         blk_queue_bounce_limit(msb->queue, limit);
         blk_queue_max_hw_sectors(msb->queue, MSPRO_BLOCK_MAX_PAGES);
-        blk_queue_max_phys_segments(msb->queue, MSPRO_BLOCK_MAX_SEGS);
-        blk_queue_max_hw_segments(msb->queue, MSPRO_BLOCK_MAX_SEGS);
+        blk_queue_max_segments(msb->queue, MSPRO_BLOCK_MAX_SEGS);
         blk_queue_max_segment_size(msb->queue,
                                    MSPRO_BLOCK_MAX_PAGES * msb->page_size);
 
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index d033cfdb516f..2658b1484a2c 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -1065,9 +1065,8 @@ static int i2o_block_probe(struct device *dev)
         queue = gd->queue;
         queue->queuedata = i2o_blk_dev;
 
-        blk_queue_max_phys_segments(queue, I2O_MAX_PHYS_SEGMENTS);
         blk_queue_max_hw_sectors(queue, max_sectors);
-        blk_queue_max_hw_segments(queue, i2o_sg_tablesize(c, body_size));
+        blk_queue_max_segments(queue, i2o_sg_tablesize(c, body_size));
 
         osm_debug("max sectors = %d\n", queue->max_sectors);
         osm_debug("phys segments = %d\n", queue->max_phys_segments);
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 09b633d5657b..381fe032caa1 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -155,8 +155,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
                 if (mq->bounce_buf) {
                         blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
                         blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
-                        blk_queue_max_phys_segments(mq->queue, bouncesz / 512);
-                        blk_queue_max_hw_segments(mq->queue, bouncesz / 512);
+                        blk_queue_max_segments(mq->queue, bouncesz / 512);
                         blk_queue_max_segment_size(mq->queue, bouncesz);
 
                         mq->sg = kmalloc(sizeof(struct scatterlist),
@@ -182,8 +181,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
                 blk_queue_bounce_limit(mq->queue, limit);
                 blk_queue_max_hw_sectors(mq->queue,
                         min(host->max_blk_count, host->max_req_size / 512));
-                blk_queue_max_phys_segments(mq->queue, host->max_phys_segs);
-                blk_queue_max_hw_segments(mq->queue, host->max_hw_segs);
+                blk_queue_max_segments(mq->queue, host->max_hw_segs);
                 blk_queue_max_segment_size(mq->queue, host->max_seg_size);
 
                 mq->sg = kmalloc(sizeof(struct scatterlist) *
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 14b1e25b9dcf..8831e9308d05 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2130,8 +2130,7 @@ static void dasd_setup_queue(struct dasd_block *block)
         blk_queue_logical_block_size(block->request_queue, block->bp_block);
         max = block->base->discipline->max_blocks << block->s2b_shift;
         blk_queue_max_hw_sectors(block->request_queue, max);
-        blk_queue_max_phys_segments(block->request_queue, -1L);
-        blk_queue_max_hw_segments(block->request_queue, -1L);
+        blk_queue_max_segments(block->request_queue, -1L);
         /* with page sized segments we can translate each segement into
          * one idaw/tidaw
          */
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 509ed056fddd..097da8ce6be6 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -223,8 +223,7 @@ tapeblock_setup_device(struct tape_device * device)
 
         blk_queue_logical_block_size(blkdat->request_queue, TAPEBLOCK_HSEC_SIZE);
         blk_queue_max_hw_sectors(blkdat->request_queue, TAPEBLOCK_MAX_SEC);
-        blk_queue_max_phys_segments(blkdat->request_queue, -1L);
-        blk_queue_max_hw_segments(blkdat->request_queue, -1L);
+        blk_queue_max_segments(blkdat->request_queue, -1L);
         blk_queue_max_segment_size(blkdat->request_queue, -1L);
         blk_queue_segment_boundary(blkdat->request_queue, -1L);
 
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 87b536a97cb4..732f6d35b4a8 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 ac3cca74bdfb..f8fbf47377ae 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 040f751809ea..c996d98636f3 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 d04ea9a6f673..f67d1a159aad 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);
diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 62b282844a53..45d908114d11 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -363,10 +363,7 @@ static int blkvsc_probe(struct device *device)
         blkdev->gd->queue = blk_init_queue(blkvsc_request, &blkdev->lock);
 
         blk_queue_max_segment_size(blkdev->gd->queue, PAGE_SIZE);
-        blk_queue_max_phys_segments(blkdev->gd->queue,
-                                    MAX_MULTIPAGE_BUFFER_COUNT);
-        blk_queue_max_hw_segments(blkdev->gd->queue,
-                                  MAX_MULTIPAGE_BUFFER_COUNT);
+        blk_queue_max_segments(blkdev->gd->queue, MAX_MULTIPAGE_BUFFER_COUNT);
         blk_queue_segment_boundary(blkdev->gd->queue, PAGE_SIZE-1);
         blk_queue_bounce_limit(blkdev->gd->queue, BLK_BOUNCE_ANY);
         blk_queue_dma_alignment(blkdev->gd->queue, 511);
diff --git a/fs/bio.c b/fs/bio.c
index 88094afc29ea..dc17afd672e3 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -507,10 +507,8 @@ int bio_get_nr_vecs(struct block_device *bdev)
         int nr_pages;
 
         nr_pages = ((queue_max_sectors(q) << 9) + PAGE_SIZE - 1) >> PAGE_SHIFT;
-        if (nr_pages > queue_max_phys_segments(q))
-                nr_pages = queue_max_phys_segments(q);
-        if (nr_pages > queue_max_hw_segments(q))
-                nr_pages = queue_max_hw_segments(q);
+        if (nr_pages > queue_max_segments(q))
+                nr_pages = queue_max_segments(q);
 
         return nr_pages;
 }
@@ -575,8 +573,7 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
          * make this too complex.
          */
 
-        while (bio->bi_phys_segments >= queue_max_phys_segments(q)
-               || bio->bi_phys_segments >= queue_max_hw_segments(q)) {
+        while (bio->bi_phys_segments >= queue_max_segments(q)) {
 
                 if (retried_segments)
                         return 0;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 57bc48446e92..ebd22dbed861 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -316,8 +316,7 @@ struct queue_limits {
         unsigned int            discard_alignment;
 
         unsigned short          logical_block_size;
-        unsigned short          max_hw_segments;
-        unsigned short          max_phys_segments;
+        unsigned short          max_segments;
 
         unsigned char           misaligned;
         unsigned char           discard_misaligned;
@@ -929,8 +928,19 @@ static inline void blk_queue_max_sectors(struct request_queue *q, unsigned int m
         blk_queue_max_hw_sectors(q, max);
 }
 
-extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short);
-extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short);
+extern void blk_queue_max_segments(struct request_queue *, unsigned short);
+
+static inline void blk_queue_max_phys_segments(struct request_queue *q, unsigned short max)
+{
+        blk_queue_max_segments(q, max);
+}
+
+static inline void blk_queue_max_hw_segments(struct request_queue *q, unsigned short max)
+{
+        blk_queue_max_segments(q, max);
+}
+
+
 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
 extern void blk_queue_max_discard_sectors(struct request_queue *q,
                 unsigned int max_discard_sectors);
@@ -1055,14 +1065,9 @@ static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
         return q->limits.max_hw_sectors;
 }
 
-static inline unsigned short queue_max_hw_segments(struct request_queue *q)
-{
-        return q->limits.max_hw_segments;
-}
-
-static inline unsigned short queue_max_phys_segments(struct request_queue *q)
+static inline unsigned short queue_max_segments(struct request_queue *q)
 {
-        return q->limits.max_phys_segments;
+        return q->limits.max_segments;
 }
 
 static inline unsigned int queue_max_segment_size(struct request_queue *q)
diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index 4c4e57d1f19d..87018dc5527d 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -385,7 +385,7 @@
 /* defines for max_sectors and max_phys_segments */
 #define I2O_MAX_SECTORS                 1024
 #define I2O_MAX_SECTORS_LIMITED         128
-#define I2O_MAX_PHYS_SEGMENTS           MAX_PHYS_SEGMENTS
+#define I2O_MAX_PHYS_SEGMENTS           BLK_MAX_SEGMENTS
 
 /*
  *      Message structures