fs, block: remove bdev->bd_super

bdev->bd_super is unused now, remove it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Message-Id: <20230807112625.652089-5-hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/ext4/super.c

@@ -5572,7 +5572,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	spin_lock_init(&sbi->s_bdev_wb_lock);
 	errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
 				 &sbi->s_bdev_wb_err);
-	sb->s_bdev->bd_super = sb;
 	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
 	ext4_orphan_cleanup(sb, es);
 	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;

fs/super.c

@@ -1322,7 +1322,6 @@ int get_tree_bdev(struct fs_context *fc,
 		}
 
 		s->s_flags |= SB_ACTIVE;
-		bdev->bd_super = s;
 	}
 
 	BUG_ON(fc->root);
@@ -1395,7 +1394,6 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
 		}
 
 		s->s_flags |= SB_ACTIVE;
-		bdev->bd_super = s;
 	}
 
 	return dget(s->s_root);
@@ -1413,7 +1411,6 @@ void kill_block_super(struct super_block *sb)
 {
 	struct block_device *bdev = sb->s_bdev;
 
-	bdev->bd_super = NULL;
 	generic_shutdown_super(sb);
 	sync_blockdev(bdev);
 	blkdev_put(bdev, sb->s_type);

include/linux/blk_types.h

@@ -52,7 +52,6 @@ struct block_device {
 	atomic_t		bd_openers;
 	spinlock_t		bd_size_lock; /* for bd_inode->i_size updates */
 	struct inode *		bd_inode;	/* will die */
-	struct super_block *	bd_super;
 	void *			bd_claiming;
 	void *			bd_holder;
 	const struct blk_holder_ops *bd_holder_ops;