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, 2 deletions

diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index 6000d3029b26..061ba6a91bf2 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -398,7 +398,6 @@ static struct inode *dlmfs_get_root_inode(struct super_block *sb)
         if (inode) {
                 inode->i_ino = get_next_ino();
                 inode_init_owner(inode, NULL, mode);
-                inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
                 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
                 inc_nlink(inode);
 
@@ -422,7 +421,6 @@ static struct inode *dlmfs_get_inode(struct inode *parent,
 
         inode->i_ino = get_next_ino();
         inode_init_owner(inode, parent, mode);
-        inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 
         ip = DLMFS_I(inode);