linux-kernel - Re: [PATCH] UDF: During mount free lvid_bh before rescanning with different blocksize

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Date:	Tue, 14 Aug 2012 15:25:06 +0200
From:	Jan Kara <jack@...e.cz>
To:	Ashish Sangwan <ashishsangwan2@...il.com>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	Ashish Sangwan <ashish.sangwan2@...il.com>,
	Namjae Jeon <linkinjeon@...il.com>
Subject: Re: [PATCH] UDF: During mount free lvid_bh before rescanning with
 different blocksize

On Sat 21-07-12 16:35:17, Ashish Sangwan wrote:
> If s_lvid_bh is not freed and set to NULL before re-scanning partition 
> with default block size, we might end up using wrong lvid in case
> s_lvid_bh is not updated in udf_load_logicalvolint during rescan.
> 
> Signed-off-by: Ashish Sangwan <ashish.sangwan2@...il.com>
> Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
  Yeah, I don't think this happens in practice but in theory it could. BTW,
did you check whether we don't need to free other information (like VAT
inode etc.) when rescanning the filesystem? I think we do but currently I'm
catching up after a long vacation and this doesn't have high priority.

Anyway, I've added your patch to my tree. Thanks.

								Honza
> 
> ---
>  fs/udf/super.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/udf/super.c b/fs/udf/super.c
> index ac8a348..4a95c56 100644
> --- a/fs/udf/super.c
> +++ b/fs/udf/super.c
> @@ -1961,6 +1961,8 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
>  			if (!silent)
>  				pr_notice("Rescanning with blocksize %d\n",
>  					  UDF_DEFAULT_BLOCKSIZE);
> +			brelse(sbi->s_lvid_bh);
> +			sbi->s_lvid_bh = NULL;
>  			uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
>  			ret = udf_load_vrs(sb, &uopt, silent, &fileset);
>  		}
> -- 
> 1.7.2.3
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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