linux-kernel - Re: [PATCH] udf: fix default mode and dmode options handling

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Date:	Tue, 2 Dec 2008 14:38:03 +0100
From:	Jan Kara <jack@...e.cz>
To:	Marcin Slusarz <marcin.slusarz@...il.com>
Cc:	Laurent Riffard <laurent.riffard@...e.fr>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] udf: fix default mode and dmode options handling

On Tue 02-12-08 00:22:31, Marcin Slusarz wrote:
> On Mon, Dec 01, 2008 at 08:28:02PM +0100, Laurent Riffard wrote:
> > >> With next-2008-11-28, I was unable to mount an UDF-formatted DVD-RW:
> > > Can you check whether attached patch fixes it?
> > Current kernel is next-20081128 + reiser4 patches + your patch: it seems to works well now.
> > (...)
> > Tested-by: Laurent Riffard <laurent.riffard@...e.fr>
> 
> Thanks!
> 
> Jan, please apply this patch:
  OK, committed.

									Honza

> ---
> From: Marcin Slusarz <marcin.slusarz@...il.com>
> Subject: [PATCH] udf: fix default mode and dmode options handling
> 
> On x86 (and several other archs) mode_t is defined as "unsigned short"
> and comparing unsigned shorts to negative ints is broken (because short
> is promoted to int and then compared). Fix it.
> 
> Reported-and-tested-by: Laurent Riffard <laurent.riffard@...e.fr>
> Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
> ---
>  fs/udf/inode.c  |    4 ++--
>  fs/udf/super.c  |    8 ++++----
>  fs/udf/udf_sb.h |    2 ++
>  3 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/udf/inode.c b/fs/udf/inode.c
> index 6612a27..2d7e56a 100644
> --- a/fs/udf/inode.c
> +++ b/fs/udf/inode.c
> @@ -1222,10 +1222,10 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
>  	iinfo->i_lenExtents = inode->i_size;
>  
>  	if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
> -			sbi->s_fmode != -1)
> +			sbi->s_fmode != UDF_INVALID_MODE)
>  		inode->i_mode = sbi->s_fmode;
>  	else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
> -			sbi->s_dmode != -1)
> +			sbi->s_dmode != UDF_INVALID_MODE)
>  		inode->i_mode = sbi->s_dmode;
>  	else
>  		inode->i_mode = udf_convert_permissions(fe);
> diff --git a/fs/udf/super.c b/fs/udf/super.c
> index e5d121d..8deaa61 100644
> --- a/fs/udf/super.c
> +++ b/fs/udf/super.c
> @@ -284,9 +284,9 @@ static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
>  		seq_printf(seq, ",gid=%u", sbi->s_gid);
>  	if (sbi->s_umask != 0)
>  		seq_printf(seq, ",umask=%o", sbi->s_umask);
> -	if (sbi->s_fmode != -1)
> +	if (sbi->s_fmode != UDF_INVALID_MODE)
>  		seq_printf(seq, ",mode=%o", sbi->s_fmode);
> -	if (sbi->s_dmode != -1)
> +	if (sbi->s_dmode != UDF_INVALID_MODE)
>  		seq_printf(seq, ",dmode=%o", sbi->s_dmode);
>  	if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
>  		seq_printf(seq, ",session=%u", sbi->s_session);
> @@ -1894,8 +1894,8 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
>  	uopt.uid = -1;
>  	uopt.gid = -1;
>  	uopt.umask = 0;
> -	uopt.fmode = -1;
> -	uopt.dmode = -1;
> +	uopt.fmode = UDF_INVALID_MODE;
> +	uopt.dmode = UDF_INVALID_MODE;
>  
>  	sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
>  	if (!sbi)
> diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
> index 5d32c60..158221e 100644
> --- a/fs/udf/udf_sb.h
> +++ b/fs/udf/udf_sb.h
> @@ -48,6 +48,8 @@
>  #define UDF_SPARABLE_MAP15		0x1522U
>  #define UDF_METADATA_MAP25		0x2511U
>  
> +#define UDF_INVALID_MODE		((mode_t)-1)
> +
>  #pragma pack(1) /* XXX(hch): Why?  This file just defines in-core structures */
>  
>  struct udf_meta_data {
> -- 
> 1.5.6.4
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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