linux-kernel - Re: [PATCH 01/11] fs: remove bdev->bd_inode_backing_dev

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Date:	Wed, 16 Sep 2009 14:06:23 +0200
From:	Jan Kara <jack@...e.cz>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, hch@...radead.org, tytso@....edu,
	akpm@...ux-foundation.org, jack@...e.cz, trond.myklebust@....uio.no
Subject: Re: [PATCH 01/11] fs: remove bdev->bd_inode_backing_dev_info

On Tue 15-09-09 20:16:47, Jens Axboe wrote:
> It has been unused since it was introduced in:
> 
> commit 520808bf20e90fdbdb320264ba7dd5cf9d47dcac
> Author: Andrew Morton <akpm@...l.org>
> Date:   Fri May 21 00:46:17 2004 -0700
> 
>     [PATCH] block device layer: separate backing_dev_info infrastructure
> 
> So lets just kill it.
> 
> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
  Fine with me: Acked-by: Jan Kara <jack@...e.cz>

								Honza
> ---
>  fs/block_dev.c        |    1 -
>  fs/inode.c            |    4 +---
>  fs/nilfs2/the_nilfs.c |    4 +---
>  include/linux/fs.h    |    1 -
>  4 files changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 3581a4e..71e7e03 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 ae7b67e..b2ba83d 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 d4168e2..ad391a8 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 b21cf6b..db29588 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
> -- 
> 1.6.4.1.207.g68ea
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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