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Commit f0b2e563 authored by Jeff Moyer's avatar Jeff Moyer Committed by Dan Williams
Browse files

blockdev: don't set S_DAX for misaligned partitions 



The dax code doesn't currently support misaligned partitions,
so disable O_DIRECT via dax until such time as that support
materializes.

Cc: <stable@vger.kernel.org>
Suggested-by: default avatarBoaz Harrosh <boaz@plexistor.com>
Signed-off-by: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent e94f5a22

fs/block_dev.c

+7 −0
Original line number Diff line number Diff line
@@ -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) {