Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.1 036/202] blockdev: dont set S_DAX for misaligned partitions | Date | Sat, 17 Oct 2015 18:56:59 -0700 |
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4.1-stable review patch. If anyone has any objections, please let me know.
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From: Jeff Moyer <jmoyer@redhat.com>
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>
--- fs/block_dev.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1234,6 +1234,13 @@ static int __blkdev_get(struct block_dev 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) {
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