dm: use fs_dax_get_by_bdev instead of dax_get_by_host

There is no point in trying to finding the dax device if the DAX flag is
not set on the queue as none of the users of the device mapper exported
block devices could make use of the DAX capability.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Link: https://lore.kernel.org/r/20210826135510.6293-4-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 2c5f9e58521179af3bf5ed2dd9ed0940cb2d0cc4..465714341300feb1feed08b6244fca69f7926897 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -650,7 +650,7 @@ static int open_table_device(struct table_device *td, dev_t dev,
        }
 
        td->dm_dev.bdev = bdev;
-       td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+       td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev);
        return 0;
 }