diff options
| author | Jeff Moyer <jmoyer@redhat.com> | 2015-08-14 16:15:32 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-22 14:49:17 -0700 |
| commit | 5704348dfc130c1482ac41da0c635ad157b43f4c (patch) | |
| tree | dd3b58332d03066bdc8cb245681f47e3c14170e8 /fs | |
| parent | fda7e543449bf0fde30464e8005dba8f1af36a2d (diff) | |
blockdev: don't set S_DAX for misaligned partitions
commit f0b2e563bc419df7c1b3d2f494574c25125f6aed upstream.
The dax code doesn't currently support misaligned partitions,
so disable O_DIRECT via dax until such time as that support
materializes.
Suggested-by: Boaz Harrosh <boaz@plexistor.com>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/block_dev.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index 198243717da5..1170f8ce5e7f 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1241,6 +1241,13 @@ 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) { |