X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=fs%2Fblock_dev.c;h=073bb57adab10ce14e55205eddf0e3de5862be1d;hb=dd2bdd7072de328bfb88e45d372371a1fa189e87;hp=22ea424ee741ea1a967676298e7877332fc324b2;hpb=06a660ada2064bbdcd09aeb8173f2ad128c71978;p=cascardo%2Flinux.git

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 22ea424ee741..073bb57adab1 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1242,6 +1242,13 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
 				goto out_clear;
 			}
 			bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
+			/*
+			 * If the partition is not aligned on a page
+			 * boundary, we can't do dax I/O to it.
+			 */
+			if ((bdev->bd_part->start_sect % (PAGE_SIZE / 512)) ||
+			    (bdev->bd_part->nr_sects % (PAGE_SIZE / 512)))
+				bdev->bd_inode->i_flags &= ~S_DAX;
 		}
 	} else {
 		if (bdev->bd_contains == bdev) {