4.1-stable review patch. If anyone has any objections, please let me know.
------------------ From: Jeff Moyer <[email protected]> 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 <[email protected]> Signed-off-by: Jeff Moyer <[email protected]> Signed-off-by: Dan Williams <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
