fs: remove bdev->bd_inode_backing_dev_info

It has been unused since it was introduced in:

commit 520808bf20e90fdbdb320264ba7dd5cf9d47dcac
Author: Andrew Morton <akpm@osdl.org>
Date:   Fri May 21 00:46:17 2004 -0700

    [PATCH] block device layer: separate backing_dev_info infrastructure

So lets just kill it.

Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

4 files changed, 2 insertions, 8 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 3581a4e53942..71e7e03ac343 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -420,7 +420,6 @@ static void bdev_destroy_inode(struct inode *inode)
 {
         struct bdev_inode *bdi = BDEV_I(inode);
 
-        bdi->bdev.bd_inode_backing_dev_info = NULL;
         kmem_cache_free(bdev_cachep, bdi);
 }
 
diff --git a/fs/inode.c b/fs/inode.c
index ae7b67e48661..b2ba83d2c4e1 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -182,9 +182,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
         if (sb->s_bdev) {
                 struct backing_dev_info *bdi;
 
-                bdi = sb->s_bdev->bd_inode_backing_dev_info;
-                if (!bdi)
-                        bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
+                bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
                 mapping->backing_dev_info = bdi;
         }
         inode->i_private = NULL;
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index d4168e269c5d..ad391a8c3e7e 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -591,9 +591,7 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
 
         nilfs->ns_mount_state = le16_to_cpu(sbp->s_state);
 
-        bdi = nilfs->ns_bdev->bd_inode_backing_dev_info;
-        if (!bdi)
-                bdi = nilfs->ns_bdev->bd_inode->i_mapping->backing_dev_info;
+        bdi = nilfs->ns_bdev->bd_inode->i_mapping->backing_dev_info;
         nilfs->ns_bdi = bdi ? : &default_backing_dev_info;
 
         /* Finding last segment */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b21cf6b9c80b..db29588874ac 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -655,7 +655,6 @@ struct block_device {
         int                     bd_invalidated;
         struct gendisk *        bd_disk;
         struct list_head        bd_list;
-        struct backing_dev_info *bd_inode_backing_dev_info;
         /*
          * Private data.  You must have bd_claim'ed the block_device
          * to use this.  NOTE:  bd_claim allows an owner to claim