linux-kernel - Re: AUTOFS3: Make sure all dentries refs are released before calling kill_anon

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Date:	Wed, 18 Oct 2006 00:23:41 +0800
From:	Ian Kent <raven@...maw.net>
To:	David Howells <dhowells@...hat.com>
Cc:	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: AUTOFS3: Make sure all dentries refs are released before
	calling kill_anon_super()

On Tue, 2006-10-17 at 17:18 +0100, David Howells wrote:
> Make sure all dentries refs are released before calling kill_anon_super() so
> that the assumption that generic_shutdown_super() can completely destroy the
> dentry tree for there will be no external references holds true.
> 
> What was being done in the put_super() superblock op, is now done in the
> kill_sb() filesystem op instead, prior to calling kill_anon_super().
> 
> The call to shrink_dcache_sb() is removed as it is redundant since
> shrink_dcache_for_umount() will now be called after the cleanup routine.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: Ian Kent <raven@...maw.net>
> ---
> 
>  fs/autofs/autofs_i.h |    1 +
>  fs/autofs/dirhash.c  |    1 -
>  fs/autofs/init.c     |    2 +-
>  fs/autofs/inode.c    |    4 ++--
>  4 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h
> index c7700d9..906ba5c 100644
> --- a/fs/autofs/autofs_i.h
> +++ b/fs/autofs/autofs_i.h
> @@ -149,6 +149,7 @@ extern const struct file_operations auto
>  /* Initializing function */
>  
>  int autofs_fill_super(struct super_block *, void *, int);
> +void autofs_kill_sb(struct super_block *sb);
>  
>  /* Queue management functions */
>  
> diff --git a/fs/autofs/dirhash.c b/fs/autofs/dirhash.c
> index 3fded38..bf8c8af 100644
> --- a/fs/autofs/dirhash.c
> +++ b/fs/autofs/dirhash.c
> @@ -246,5 +246,4 @@ void autofs_hash_nuke(struct autofs_sb_i
>  			kfree(ent);
>  		}
>  	}
> -	shrink_dcache_sb(sbi->sb);
>  }
> diff --git a/fs/autofs/init.c b/fs/autofs/init.c
> index aca1237..cea5219 100644
> --- a/fs/autofs/init.c
> +++ b/fs/autofs/init.c
> @@ -24,7 +24,7 @@ static struct file_system_type autofs_fs
>  	.owner		= THIS_MODULE,
>  	.name		= "autofs",
>  	.get_sb		= autofs_get_sb,
> -	.kill_sb	= kill_anon_super,
> +	.kill_sb	= autofs_kill_sb,
>  };
>  
>  static int __init init_autofs_fs(void)
> diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
> index 2c9759b..54c518c 100644
> --- a/fs/autofs/inode.c
> +++ b/fs/autofs/inode.c
> @@ -20,7 +20,7 @@ #include <linux/magic.h>
>  #include "autofs_i.h"
>  #include <linux/module.h>
>  
> -static void autofs_put_super(struct super_block *sb)
> +void autofs_kill_sb(struct super_block *sb)
>  {
>  	struct autofs_sb_info *sbi = autofs_sbi(sb);
>  	unsigned int n;
> @@ -37,13 +37,13 @@ static void autofs_put_super(struct supe
>  	kfree(sb->s_fs_info);
>  
>  	DPRINTK(("autofs: shutting down\n"));
> +	kill_anon_super(sb);
>  }
>  
>  static void autofs_read_inode(struct inode *inode);
>  
>  static struct super_operations autofs_sops = {
>  	.read_inode	= autofs_read_inode,
> -	.put_super	= autofs_put_super,
>  	.statfs		= simple_statfs,
>  };
>  

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