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, 0 insertions, 1 deletions

diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index ad4d712002f4..889d558b4e05 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -59,7 +59,6 @@ struct inode *ramfs_get_inode(struct super_block *sb,
                 inode->i_ino = get_next_ino();
                 inode_init_owner(inode, dir, mode);
                 inode->i_mapping->a_ops = &ramfs_aops;
-                inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
                 mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
                 mapping_set_unevictable(inode->i_mapping);
                 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;