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>

1 files changed, 12 insertions, 3 deletions

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;