block, dax: remove dead code in blkdev_writepages()

Block device inodes never have S_DAX set, so kill the check for DAX and
diversion to dax_writeback_mapping_range().

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/fs/block_dev.c b/fs/block_dev.c
index fe09ef9c21f349a55d31261b5dd416b1bde2a3aa..846ee2d31781ba98f56d4c5f5c1b7e3e5108ebd7 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1946,11 +1946,6 @@ static int blkdev_releasepage(struct page *page, gfp_t wait)
 static int blkdev_writepages(struct address_space *mapping,
                             struct writeback_control *wbc)
 {
-       if (dax_mapping(mapping)) {
-               struct block_device *bdev = I_BDEV(mapping->host);
-
-               return dax_writeback_mapping_range(mapping, bdev, wbc);
-       }
        return generic_writepages(mapping, wbc);
 }