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Date:	Sat, 25 Feb 2012 11:56:41 -0700
From:	Andreas Dilger <adilger@...ger.ca>
To:	Tom Gundersen <teg@...m.no>, "Ted Ts'o" <tytso@....edu>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Tom Gundersen <teg@...m.no>,
	Thomas Baechler <thomas@...hlinux.org>,
	Tobias Powalowski <tobias.powalowski@...glemail.com>,
	Dave Reisner <d@...conindy.com>
Subject: Re: [PATCH] ext4: ignore ext3/ext2 only mount options

On 2012-02-25, at 6:37, Tom Gundersen <teg@...m.no> wrote:

> There is a regression when using the ext4 module to mount
> ext2 or ext3 filesystems: When mountoptions are used that are
> supported by ext2 or ext3, but not by ext4 the mount fails.
> 
> This patch changes the failure into a warning. The case when
> the ext4 module is not used for ext2/3 support is unchanged.
> 
> Report: https://bbs.archlinux.org/profile.php?id=33804
> Signed-off-by: Tom Gundersen <teg@...m.no>
> Cc: Thomas Baechler <thomas@...hlinux.org>
> Cc: Tobias Powalowski <tobias.powalowski@...glemail.com>
> Cc: Dave Reisner <d@...conindy.com>

Looks reasonable. Thanks for submitting the patch. 

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> fs/ext4/super.c |   15 +++++++++++++++
> 1 file changed, 15 insertions(+)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 502c61f..30de9cd 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1333,6 +1333,7 @@ enum {
>    Opt_inode_readahead_blks, Opt_journal_ioprio,
>    Opt_dioread_nolock, Opt_dioread_lock,
>    Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
> +    Opt_nocheck, Opt_reservation, Opt_noreservation, Opt_journal_inum,
> };
> 
> static const match_table_t tokens = {
> @@ -1408,6 +1409,10 @@ static const match_table_t tokens = {
>    {Opt_init_itable, "init_itable=%u"},
>    {Opt_init_itable, "init_itable"},
>    {Opt_noinit_itable, "noinit_itable"},
> +    {Opt_nocheck, "nocheck"},
> +    {Opt_reservation, "reservation"},
> +    {Opt_noreservation, "noreservation"},
> +    {Opt_journal_inum, "journal=%u"},
>    {Opt_err, NULL},
> };
> 
> @@ -1904,6 +1909,16 @@ set_qf_format:
>        case Opt_noinit_itable:
>            clear_opt(sb, INIT_INODE_TABLE);
>            break;
> +#ifdef CONFIG_EXT4_USE_FOR_EXT23
> +        case Opt_nocheck:
> +        case Opt_reservation:
> +        case Opt_noreservation:
> +        case Opt_journal_inum:
> +            ext4_msg(sb, KERN_WARNING,
> +                   "ext3 mount option \"%s\" ignored "
> +                   "by ext4 module", p);
> +            break;
> +#endif
>        default:
>            ext4_msg(sb, KERN_ERR,
>                   "Unrecognized mount option \"%s\" "
> -- 
> 1.7.9.2
> 
> --
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