[PATCH] brd: Only request 4K sectors if DAX is enabled

[Boaz Harrosh <boaz@plexistor.com>]

People systems have been using ramdisk with
smaller-than-page-size blocks in their mkfs.

The 4K sectors is only important if we will be
using brd with a DAX filesystem.

So only enable 4K sectors if DAX is configured

Signed-off-by: Boaz Harrosh <boaz@plexistor.com>
---
 drivers/block/brd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 6e0775b..e875f12 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -495,6 +495,7 @@ static struct brd_device *brd_alloc(int i)
 	blk_queue_max_hw_sectors(brd->brd_queue, 1024);
 	blk_queue_bounce_limit(brd->brd_queue, BLK_BOUNCE_ANY);
 
+#ifdef CONFIG_BLK_DEV_RAM_DAX
 	/* This is so fdisk will align partitions on 4k, because of
 	 * direct_access API needing 4k alignment, returning a PFN
 	 * (This is only a problem on very small devices <= 4M,
@@ -502,6 +503,7 @@ static struct brd_device *brd_alloc(int i)
 	 *  is harmless)
 	 */
 	blk_queue_physical_block_size(brd->brd_queue, PAGE_SIZE);
+#endif
 
 	brd->brd_queue->limits.discard_granularity = PAGE_SIZE;
 	brd->brd_queue->limits.max_discard_sectors = UINT_MAX;
-- 
1.9.3