block: Use accessor functions for queue limits

Convert all external users of queue limits to using wrapper functions
instead of poking the request queue variables directly.

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

25 files changed, 147 insertions, 97 deletions

diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index 0d98054cdbd7..30022b4e2f63 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -388,10 +388,10 @@ int blkdev_issue_discard(struct block_device *bdev,
 
                 bio->bi_sector = sector;
 
-                if (nr_sects > q->max_hw_sectors) {
-                        bio->bi_size = q->max_hw_sectors << 9;
-                        nr_sects -= q->max_hw_sectors;
-                        sector += q->max_hw_sectors;
+                if (nr_sects > queue_max_hw_sectors(q)) {
+                        bio->bi_size = queue_max_hw_sectors(q) << 9;
+                        nr_sects -= queue_max_hw_sectors(q);
+                        sector += queue_max_hw_sectors(q);
                 } else {
                         bio->bi_size = nr_sects << 9;
                         nr_sects = 0;
diff --git a/block/blk-core.c b/block/blk-core.c
index 59c4af523112..7a4c40184a64 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1437,11 +1437,11 @@ static inline void __generic_make_request(struct bio *bio)
                         goto end_io;
                 }
 
-                if (unlikely(nr_sectors > q->max_hw_sectors)) {
+                if (unlikely(nr_sectors > queue_max_hw_sectors(q))) {
                         printk(KERN_ERR "bio too big device %s (%u > %u)\n",
-                                bdevname(bio->bi_bdev, b),
-                                bio_sectors(bio),
-                                q->max_hw_sectors);
+                               bdevname(bio->bi_bdev, b),
+                               bio_sectors(bio),
+                               queue_max_hw_sectors(q));
                         goto end_io;
                 }
 
@@ -1608,8 +1608,8 @@ EXPORT_SYMBOL(submit_bio);
  */
 int blk_rq_check_limits(struct request_queue *q, struct request *rq)
 {
-        if (blk_rq_sectors(rq) > q->max_sectors ||
-            blk_rq_bytes(rq) > q->max_hw_sectors << 9) {
+        if (blk_rq_sectors(rq) > queue_max_sectors(q) ||
+            blk_rq_bytes(rq) > queue_max_hw_sectors(q) << 9) {
                 printk(KERN_ERR "%s: over max size limit.\n", __func__);
                 return -EIO;
         }
@@ -1621,8 +1621,8 @@ int blk_rq_check_limits(struct request_queue *q, struct request *rq)
          * limitation.
          */
         blk_recalc_rq_segments(rq);
-        if (rq->nr_phys_segments > q->max_phys_segments ||
-            rq->nr_phys_segments > q->max_hw_segments) {
+        if (rq->nr_phys_segments > queue_max_phys_segments(q) ||
+            rq->nr_phys_segments > queue_max_hw_segments(q)) {
                 printk(KERN_ERR "%s: over max segments limit.\n", __func__);
                 return -EIO;
         }
diff --git a/block/blk-map.c b/block/blk-map.c
index ef2492adca7e..9083cf0180cc 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -115,7 +115,7 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
         struct bio *bio = NULL;
         int ret;
 
-        if (len > (q->max_hw_sectors << 9))
+        if (len > (queue_max_hw_sectors(q) << 9))
                 return -EINVAL;
         if (!len)
                 return -EINVAL;
@@ -292,7 +292,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
         struct bio *bio;
         int ret;
 
-        if (len > (q->max_hw_sectors << 9))
+        if (len > (queue_max_hw_sectors(q) << 9))
                 return -EINVAL;
         if (!len || !kbuf)
                 return -EINVAL;
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 4974dd5767e5..39ce64432ba6 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -32,11 +32,12 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
                          * never considered part of another segment, since that
                          * might change with the bounce page.
                          */
-                        high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
+                        high = page_to_pfn(bv->bv_page) > queue_bounce_pfn(q);
                         if (high || highprv)
                                 goto new_segment;
                         if (cluster) {
-                                if (seg_size + bv->bv_len > q->max_segment_size)
+                                if (seg_size + bv->bv_len
+                                    > queue_max_segment_size(q))
                                         goto new_segment;
                                 if (!BIOVEC_PHYS_MERGEABLE(bvprv, bv))
                                         goto new_segment;
@@ -91,7 +92,7 @@ static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
                 return 0;
 
         if (bio->bi_seg_back_size + nxt->bi_seg_front_size >
-            q->max_segment_size)
+            queue_max_segment_size(q))
                 return 0;
 
         if (!bio_has_data(bio))
@@ -134,7 +135,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
                 int nbytes = bvec->bv_len;
 
                 if (bvprv && cluster) {
-                        if (sg->length + nbytes > q->max_segment_size)
+                        if (sg->length + nbytes > queue_max_segment_size(q))
                                 goto new_segment;
 
                         if (!BIOVEC_PHYS_MERGEABLE(bvprv, bvec))
@@ -205,8 +206,8 @@ 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 > q->max_hw_segments
-            || req->nr_phys_segments + nr_phys_segs > q->max_phys_segments) {
+        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)) {
                 req->cmd_flags |= REQ_NOMERGE;
                 if (req == q->last_merge)
                         q->last_merge = NULL;
@@ -227,9 +228,9 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
         unsigned short max_sectors;
 
         if (unlikely(blk_pc_request(req)))
-                max_sectors = q->max_hw_sectors;
+                max_sectors = queue_max_hw_sectors(q);
         else
-                max_sectors = q->max_sectors;
+                max_sectors = queue_max_sectors(q);
 
         if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
                 req->cmd_flags |= REQ_NOMERGE;
@@ -251,9 +252,9 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
         unsigned short max_sectors;
 
         if (unlikely(blk_pc_request(req)))
-                max_sectors = q->max_hw_sectors;
+                max_sectors = queue_max_hw_sectors(q);
         else
-                max_sectors = q->max_sectors;
+                max_sectors = queue_max_sectors(q);
 
 
         if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
@@ -287,7 +288,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
         /*
          * Will it become too large?
          */
-        if ((blk_rq_sectors(req) + blk_rq_sectors(next)) > q->max_sectors)
+        if ((blk_rq_sectors(req) + blk_rq_sectors(next)) > queue_max_sectors(q))
                 return 0;
 
         total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;
@@ -299,10 +300,10 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
                 total_phys_segments--;
         }
 
-        if (total_phys_segments > q->max_phys_segments)
+        if (total_phys_segments > queue_max_phys_segments(q))
                 return 0;
 
-        if (total_phys_segments > q->max_hw_segments)
+        if (total_phys_segments > queue_max_hw_segments(q))
                 return 0;
 
         /* Merge is OK... */
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 15c3164537b8..0b32f984eed2 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -219,6 +219,15 @@ void blk_queue_max_sectors(struct request_queue *q, unsigned int max_sectors)
 }
 EXPORT_SYMBOL(blk_queue_max_sectors);
 
+void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_sectors)
+{
+        if (BLK_DEF_MAX_SECTORS > max_sectors)
+                q->max_hw_sectors = BLK_DEF_MAX_SECTORS;
+        else
+                q->max_hw_sectors = max_sectors;
+}
+EXPORT_SYMBOL(blk_queue_max_hw_sectors);
+
 /**
  * blk_queue_max_phys_segments - set max phys segments for a request for this queue
  * @q:  the request queue for the device
@@ -395,11 +404,11 @@ int blk_queue_dma_drain(struct request_queue *q,
                                dma_drain_needed_fn *dma_drain_needed,
                                void *buf, unsigned int size)
 {
-        if (q->max_hw_segments < 2 || q->max_phys_segments < 2)
+        if (queue_max_hw_segments(q) < 2 || queue_max_phys_segments(q) < 2)
                 return -EINVAL;
         /* make room for appending the drain */
-        --q->max_hw_segments;
-        --q->max_phys_segments;
+        blk_queue_max_hw_segments(q, queue_max_hw_segments(q) - 1);
+        blk_queue_max_phys_segments(q, queue_max_phys_segments(q) - 1);
         q->dma_drain_needed = dma_drain_needed;
         q->dma_drain_buffer = buf;
         q->dma_drain_size = size;
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 13d38b7e4d0f..142a4acddd43 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -95,7 +95,7 @@ queue_ra_store(struct request_queue *q, const char *page, size_t count)
 
 static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
 {
-        int max_sectors_kb = q->max_sectors >> 1;
+        int max_sectors_kb = queue_max_sectors(q) >> 1;
 
         return queue_var_show(max_sectors_kb, (page));
 }
@@ -109,7 +109,7 @@ static ssize_t
 queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
 {
         unsigned long max_sectors_kb,
-                        max_hw_sectors_kb = q->max_hw_sectors >> 1,
+                max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
                         page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
         ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
 
@@ -117,7 +117,7 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
                 return -EINVAL;
 
         spin_lock_irq(q->queue_lock);
-        q->max_sectors = max_sectors_kb << 1;
+        blk_queue_max_sectors(q, max_sectors_kb << 1);
         spin_unlock_irq(q->queue_lock);
 
         return ret;
@@ -125,7 +125,7 @@ queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
 
 static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
 {
-        int max_hw_sectors_kb = q->max_hw_sectors >> 1;
+        int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
 
         return queue_var_show(max_hw_sectors_kb, (page));
 }
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 9eaa1940273a..df18a156d011 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -766,7 +766,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
                 return compat_put_int(arg, bdev_logical_block_size(bdev));
         case BLKSECTGET:
                 return compat_put_ushort(arg,
-                                         bdev_get_queue(bdev)->max_sectors);
+                                         queue_max_sectors(bdev_get_queue(bdev)));
         case BLKRASET: /* compatible, but no compat_ptr (!) */
         case BLKFRASET:
                 if (!capable(CAP_SYS_ADMIN))
diff --git a/block/ioctl.c b/block/ioctl.c
index 7aa97f65da82..500e4c73cc52 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -152,10 +152,10 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
                 bio->bi_private = &wait;
                 bio->bi_sector = start;
 
-                if (len > q->max_hw_sectors) {
-                        bio->bi_size = q->max_hw_sectors << 9;
-                        len -= q->max_hw_sectors;
-                        start += q->max_hw_sectors;
+                if (len > queue_max_hw_sectors(q)) {
+                        bio->bi_size = queue_max_hw_sectors(q) << 9;
+                        len -= queue_max_hw_sectors(q);
+                        start += queue_max_hw_sectors(q);
                 } else {
                         bio->bi_size = len << 9;
                         len = 0;
@@ -313,7 +313,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
         case BLKSSZGET: /* get block device hardware sector size */
                 return put_int(arg, bdev_logical_block_size(bdev));
         case BLKSECTGET:
-                return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
+                return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
         case BLKRASET:
         case BLKFRASET:
                 if(!capable(CAP_SYS_ADMIN))
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index a9670dd4b5de..5f8e798ede4e 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -75,7 +75,7 @@ static int sg_set_timeout(struct request_queue *q, int __user *p)
 
 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
 {
-        unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
+        unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
 
         return put_user(val, p);
 }
@@ -89,8 +89,8 @@ static int sg_set_reserved_size(struct request_queue *q, int __user *p)
 
         if (size < 0)
                 return -EINVAL;
-        if (size > (q->max_sectors << 9))
-                size = q->max_sectors << 9;
+        if (size > (queue_max_sectors(q) << 9))
+                size = queue_max_sectors(q) << 9;
 
         q->sg_reserved_size = size;
         return 0;
@@ -264,7 +264,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
         if (hdr->cmd_len > BLK_MAX_CDB)
                 return -EINVAL;
 
-        if (hdr->dxfer_len > (q->max_hw_sectors << 9))
+        if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
                 return -EIO;
 
         if (hdr->dxfer_len)
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 293f5858921d..d57f11759480 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -991,13 +991,15 @@ 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 <= q->max_phys_segments) {
+        if ((pd->settings.size << 9) / CD_FRAMESIZE
+            <= queue_max_phys_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 <= q->max_phys_segments) {
+        } else if ((pd->settings.size << 9) / PAGE_SIZE
+                   <= queue_max_phys_segments(q)) {
                 /*
                  * We can handle this case at the expense of some extra memory
                  * copies during write operations
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index cceace61ef28..71d1b9bab70b 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2101,8 +2101,8 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
                 nr = nframes;
                 if (cdi->cdda_method == CDDA_BPC_SINGLE)
                         nr = 1;
-                if (nr * CD_FRAMESIZE_RAW > (q->max_sectors << 9))
-                        nr = (q->max_sectors << 9) / CD_FRAMESIZE_RAW;
+                if (nr * CD_FRAMESIZE_RAW > (queue_max_sectors(q) << 9))
+                        nr = (queue_max_sectors(q) << 9) / CD_FRAMESIZE_RAW;
 
                 len = nr * CD_FRAMESIZE_RAW;
 
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 65e2d9759857..e9a73bb242b0 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -510,7 +510,7 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
          *        combine_restrictions_low()
          */
         rs->max_sectors =
-                min_not_zero(rs->max_sectors, q->max_sectors);
+                min_not_zero(rs->max_sectors, queue_max_sectors(q));
 
         /*
          * Check if merge fn is supported.
@@ -525,25 +525,25 @@ void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
 
         rs->max_phys_segments =
                 min_not_zero(rs->max_phys_segments,
-                             q->max_phys_segments);
+                             queue_max_phys_segments(q));
 
         rs->max_hw_segments =
-                min_not_zero(rs->max_hw_segments, q->max_hw_segments);
+                min_not_zero(rs->max_hw_segments, queue_max_hw_segments(q));
 
         rs->logical_block_size = max(rs->logical_block_size,
                                      queue_logical_block_size(q));
 
         rs->max_segment_size =
-                min_not_zero(rs->max_segment_size, q->max_segment_size);
+                min_not_zero(rs->max_segment_size, queue_max_segment_size(q));
 
         rs->max_hw_sectors =
-                min_not_zero(rs->max_hw_sectors, q->max_hw_sectors);
+                min_not_zero(rs->max_hw_sectors, queue_max_hw_sectors(q));
 
         rs->seg_boundary_mask =
                 min_not_zero(rs->seg_boundary_mask,
-                             q->seg_boundary_mask);
+                             queue_segment_boundary(q));
 
-        rs->bounce_pfn = min_not_zero(rs->bounce_pfn, q->bounce_pfn);
+        rs->bounce_pfn = min_not_zero(rs->bounce_pfn, queue_bounce_pfn(q));
 
         rs->no_cluster |= !test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
 }
@@ -914,13 +914,13 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
          * restrictions.
          */
         blk_queue_max_sectors(q, t->limits.max_sectors);
-        q->max_phys_segments = t->limits.max_phys_segments;
-        q->max_hw_segments = t->limits.max_hw_segments;
-        q->logical_block_size = t->limits.logical_block_size;
-        q->max_segment_size = t->limits.max_segment_size;
-        q->max_hw_sectors = t->limits.max_hw_sectors;
-        q->seg_boundary_mask = t->limits.seg_boundary_mask;
-        q->bounce_pfn = t->limits.bounce_pfn;
+        blk_queue_max_phys_segments(q, t->limits.max_phys_segments);
+        blk_queue_max_hw_segments(q, t->limits.max_hw_segments);
+        blk_queue_logical_block_size(q, t->limits.logical_block_size);
+        blk_queue_max_segment_size(q, t->limits.max_segment_size);
+        blk_queue_max_hw_sectors(q, t->limits.max_hw_sectors);
+        blk_queue_segment_boundary(q, t->limits.seg_boundary_mask);
+        blk_queue_bounce_limit(q, t->limits.bounce_pfn);
 
         if (t->limits.no_cluster)
                 queue_flag_clear_unlocked(QUEUE_FLAG_CLUSTER, q);
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 7a36e38393a1..64f1f3e046e0 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -146,7 +146,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
                  * a one page request is never in violation.
                  */
                 if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    mddev->queue->max_sectors > (PAGE_SIZE>>9))
+                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
                         blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                 disk->num_sectors = rdev->sectors;
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 41ced0cbe823..4ee31aa13c40 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -303,7 +303,7 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                  * merge_bvec_fn will be involved in multipath.)
                  */
                         if (q->merge_bvec_fn &&
-                            mddev->queue->max_sectors > (PAGE_SIZE>>9))
+                            queue_max_sectors(q) > (PAGE_SIZE>>9))
                                 blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                         conf->working_disks++;
@@ -467,7 +467,7 @@ static int multipath_run (mddev_t *mddev)
                  * violating it, not that we ever expect a device with
                  * a merge_bvec_fn to be involved in multipath */
                 if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    mddev->queue->max_sectors > (PAGE_SIZE>>9))
+                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
                         blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                 if (!test_bit(Faulty, &rdev->flags))
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index c08d7559be55..925507e7d673 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -144,7 +144,7 @@ static int create_strip_zones (mddev_t *mddev)
                  */
 
                 if (rdev1->bdev->bd_disk->queue->merge_bvec_fn &&
-                    mddev->queue->max_sectors > (PAGE_SIZE>>9))
+                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
                         blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                 if (!smallest || (rdev1->sectors < smallest->sectors))
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 36df9109cde1..e23758b4a34e 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1130,7 +1130,7 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                          * a one page request is never in violation.
                          */
                         if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                            mddev->queue->max_sectors > (PAGE_SIZE>>9))
+                            queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
                                 blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                         p->head_position = 0;
@@ -1996,7 +1996,7 @@ static int run(mddev_t *mddev)
                  * a one page request is never in violation.
                  */
                 if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    mddev->queue->max_sectors > (PAGE_SIZE>>9))
+                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
                         blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                 disk->head_position = 0;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 499620afb44b..750550c1166f 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1158,8 +1158,8 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                          * a one page request is never in violation.
                          */
                         if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                            mddev->queue->max_sectors > (PAGE_SIZE>>9))
-                                mddev->queue->max_sectors = (PAGE_SIZE>>9);
+                            queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
+                                blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                         p->head_position = 0;
                         rdev->raid_disk = mirror;
@@ -2145,8 +2145,8 @@ static int run(mddev_t *mddev)
                  * a one page request is never in violation.
                  */
                 if (rdev->bdev->bd_disk->queue->merge_bvec_fn &&
-                    mddev->queue->max_sectors > (PAGE_SIZE>>9))
-                        mddev->queue->max_sectors = (PAGE_SIZE>>9);
+                    queue_max_sectors(mddev->queue) > (PAGE_SIZE>>9))
+                        blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
 
                 disk->head_position = 0;
         }
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 4616bc3a6e71..7970dc8c522e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3463,10 +3463,10 @@ static int bio_fits_rdev(struct bio *bi)
 {
         struct request_queue *q = bdev_get_queue(bi->bi_bdev);
 
-        if ((bi->bi_size>>9) > q->max_sectors)
+        if ((bi->bi_size>>9) > queue_max_sectors(q))
                 return 0;
         blk_recount_segments(q, bi);
-        if (bi->bi_phys_segments > q->max_phys_segments)
+        if (bi->bi_phys_segments > queue_max_phys_segments(q))
                 return 0;
 
         if (q->merge_bvec_fn)
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 0fc2c0ae7691..9bd407fa98e4 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -289,8 +289,8 @@ 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(q->max_hw_segments,
-                                        q->max_phys_segments);
+                sdp->sg_tablesize = min(queue_max_hw_segments(q),
+                                        queue_max_phys_segments(q));
         }
         if ((sfp = sg_add_sfp(sdp, dev)))
                 filp->private_data = sfp;
@@ -909,7 +909,7 @@ sg_ioctl(struct inode *inode, struct file *filp,
                 if (val < 0)
                         return -EINVAL;
                 val = min_t(int, val,
-                                sdp->device->request_queue->max_sectors * 512);
+                            queue_max_sectors(sdp->device->request_queue) * 512);
                 if (val != sfp->reserve.bufflen) {
                         if (sg_res_in_use(sfp) || sfp->mmap_called)
                                 return -EBUSY;
@@ -919,7 +919,7 @@ sg_ioctl(struct inode *inode, struct file *filp,
                 return 0;
         case SG_GET_RESERVED_SIZE:
                 val = min_t(int, sfp->reserve.bufflen,
-                                sdp->device->request_queue->max_sectors * 512);
+                            queue_max_sectors(sdp->device->request_queue) * 512);
                 return put_user(val, ip);
         case SG_SET_COMMAND_Q:
                 result = get_user(val, ip);
@@ -1059,7 +1059,7 @@ sg_ioctl(struct inode *inode, struct file *filp,
                         return -ENODEV;
                 return scsi_ioctl(sdp->device, cmd_in, p);
         case BLKSECTGET:
-                return put_user(sdp->device->request_queue->max_sectors * 512,
+                return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
                                 ip);
         case BLKTRACESETUP:
                 return blk_trace_setup(sdp->device->request_queue,
@@ -1377,7 +1377,8 @@ 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(q->max_hw_segments, q->max_phys_segments);
+        sdp->sg_tablesize = min(queue_max_hw_segments(q),
+                                queue_max_phys_segments(q));
         sdp->index = k;
         kref_init(&sdp->d_ref);
 
@@ -2055,7 +2056,7 @@ sg_add_sfp(Sg_device * sdp, int dev)
                 sg_big_buff = def_reserved_size;
 
         bufflen = min_t(int, sg_big_buff,
-                        sdp->device->request_queue->max_sectors * 512);
+                        queue_max_sectors(sdp->device->request_queue) * 512);
         sg_build_reserve(sfp, bufflen);
         SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp:   bufflen=%d, k_use_sg=%d\n",
                            sfp->reserve.bufflen, sfp->reserve.k_use_sg));
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 8681b708344f..89bd438e1fe3 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -3983,8 +3983,8 @@ static int st_probe(struct device *dev)
                 return -ENODEV;
         }
 
-        i = min(SDp->request_queue->max_hw_segments,
-                SDp->request_queue->max_phys_segments);
+        i = min(queue_max_hw_segments(SDp->request_queue),
+                queue_max_phys_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/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 4ca3b5860643..cfa26d56ce60 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -132,7 +132,7 @@ static int slave_configure(struct scsi_device *sdev)
 
                 if (us->fflags & US_FL_MAX_SECTORS_MIN)
                         max_sectors = PAGE_CACHE_SIZE >> 9;
-                if (sdev->request_queue->max_sectors > max_sectors)
+                if (queue_max_sectors(sdev->request_queue) > max_sectors)
                         blk_queue_max_sectors(sdev->request_queue,
                                               max_sectors);
         } else if (sdev->type == TYPE_TAPE) {
@@ -483,7 +483,7 @@ static ssize_t show_max_sectors(struct device *dev, struct device_attribute *att
 {
         struct scsi_device *sdev = to_scsi_device(dev);
 
-        return sprintf(buf, "%u\n", sdev->request_queue->max_sectors);
+        return sprintf(buf, "%u\n", queue_max_sectors(sdev->request_queue));
 }
 
 /* Input routine for the sysfs max_sectors file */
diff --git a/fs/bio.c b/fs/bio.c
index 4445c3821730..ab423a1024ab 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -499,11 +499,11 @@ int bio_get_nr_vecs(struct block_device *bdev)
         struct request_queue *q = bdev_get_queue(bdev);
         int nr_pages;
 
-        nr_pages = ((q->max_sectors << 9) + PAGE_SIZE - 1) >> PAGE_SHIFT;
-        if (nr_pages > q->max_phys_segments)
-                nr_pages = q->max_phys_segments;
-        if (nr_pages > q->max_hw_segments)
-                nr_pages = q->max_hw_segments;
+        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);
 
         return nr_pages;
 }
@@ -562,8 +562,8 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
          * make this too complex.
          */
 
-        while (bio->bi_phys_segments >= q->max_phys_segments
-               || bio->bi_phys_segments >= q->max_hw_segments) {
+        while (bio->bi_phys_segments >= queue_max_phys_segments(q)
+               || bio->bi_phys_segments >= queue_max_hw_segments(q)) {
 
                 if (retried_segments)
                         return 0;
@@ -634,7 +634,8 @@ static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page
 int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page *page,
                     unsigned int len, unsigned int offset)
 {
-        return __bio_add_page(q, bio, page, len, offset, q->max_hw_sectors);
+        return __bio_add_page(q, bio, page, len, offset,
+                              queue_max_hw_sectors(q));
 }
 
 /**
@@ -654,7 +655,7 @@ int bio_add_page(struct bio *bio, struct page *page, unsigned int len,
                  unsigned int offset)
 {
         struct request_queue *q = bdev_get_queue(bio->bi_bdev);
-        return __bio_add_page(q, bio, page, len, offset, q->max_sectors);
+        return __bio_add_page(q, bio, page, len, offset, queue_max_sectors(q));
 }
 
 struct bio_map_data {
diff --git a/include/linux/bio.h b/include/linux/bio.h
index d30ec6f30dd7..12737be58601 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -279,7 +279,7 @@ static inline int bio_has_allocated_vec(struct bio *bio)
 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
         (((addr1) | (mask)) == (((addr2) - 1) | (mask)))
 #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
-        __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, (q)->seg_boundary_mask)
+        __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q)))
 #define BIO_SEG_BOUNDARY(q, b1, b2) \
         BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2)))
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 872b78b7a101..29b48f7b4ba8 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -898,6 +898,7 @@ extern void blk_cleanup_queue(struct request_queue *);
 extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
 extern void blk_queue_bounce_limit(struct request_queue *, u64);
 extern void blk_queue_max_sectors(struct request_queue *, unsigned int);
+extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
 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_segment_size(struct request_queue *, unsigned int);
@@ -988,6 +989,41 @@ extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter);
 
 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
 
+static inline unsigned long queue_bounce_pfn(struct request_queue *q)
+{
+        return q->bounce_pfn;
+}
+
+static inline unsigned long queue_segment_boundary(struct request_queue *q)
+{
+        return q->seg_boundary_mask;
+}
+
+static inline unsigned int queue_max_sectors(struct request_queue *q)
+{
+        return q->max_sectors;
+}
+
+static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
+{
+        return q->max_hw_sectors;
+}
+
+static inline unsigned short queue_max_hw_segments(struct request_queue *q)
+{
+        return q->max_hw_segments;
+}
+
+static inline unsigned short queue_max_phys_segments(struct request_queue *q)
+{
+        return q->max_phys_segments;
+}
+
+static inline unsigned int queue_max_segment_size(struct request_queue *q)
+{
+        return q->max_segment_size;
+}
+
 static inline unsigned short queue_logical_block_size(struct request_queue *q)
 {
         int retval = 512;
diff --git a/mm/bounce.c b/mm/bounce.c
index e590272fe7a8..8dcd4315e01c 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -192,7 +192,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
                 /*
                  * is destination page below bounce pfn?
                  */
-                if (page_to_pfn(page) <= q->bounce_pfn)
+                if (page_to_pfn(page) <= queue_bounce_pfn(q))
                         continue;
 
                 /*
@@ -284,7 +284,7 @@ void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
          * don't waste time iterating over bio segments
          */
         if (!(q->bounce_gfp & GFP_DMA)) {
-                if (q->bounce_pfn >= blk_max_pfn)
+                if (queue_bounce_pfn(q) >= blk_max_pfn)
                         return;
                 pool = page_pool;
         } else {