fs: remove mapping->backing_dev_info

Now that we never use the backing_dev_info pointer in struct address_space
we can simply remove it and save 4 to 8 bytes in every inode.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index a24891b97547..6e29bf2db536 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -104,11 +104,9 @@ static int raw_release(struct inode *inode, struct file *filp)
 
         mutex_lock(&raw_mutex);
         bdev = raw_devices[minor].binding;
-        if (--raw_devices[minor].inuse == 0) {
+        if (--raw_devices[minor].inuse == 0)
                 /* Here  inode->i_mapping == bdev->bd_inode->i_mapping  */
                 inode->i_mapping = &inode->i_data;
-                inode->i_mapping->backing_dev_info = &default_backing_dev_info;
-        }
         mutex_unlock(&raw_mutex);
 
         blkdev_put(bdev, filp->f_mode | FMODE_EXCL);