dmatest: fix handling of an even number of xor_sources

[pandora-kernel.git] / block / blk-settings.c

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 127f825..5eeb9e0 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -639,6 +639,28 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 }
 EXPORT_SYMBOL(blk_stack_limits);
 
+/**
+ * bdev_stack_limits - adjust queue limits for stacked drivers
+ * @t: the stacking driver limits (top device)
+ * @bdev:  the component block_device (bottom)
+ * @start:  first data sector within component device
+ *
+ * Description:
+ *    Merges queue limits for a top device and a block_device.  Returns
+ *    0 if alignment didn't change.  Returns -1 if adding the bottom
+ *    device caused misalignment.
+ */
+int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
+                     sector_t start)
+{
+       struct request_queue *bq = bdev_get_queue(bdev);
+
+       start += get_start_sect(bdev);
+
+       return blk_stack_limits(t, &bq->limits, start << 9);
+}
+EXPORT_SYMBOL(bdev_stack_limits);
+
 /**
  * disk_stack_limits - adjust queue limits for stacked drivers
  * @disk:  MD/DM gendisk (top)