linux-ext4 - Re: [PATCH v2] ext4: Deprecate data=journal mount option

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Date:	Thu, 11 Aug 2011 17:01:37 +0200 (CEST)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
cc:	linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.cz,
	sandeen@...hat.com, adilger@...06002191d9348c.cg.shawcable.net
Subject: Re: [PATCH v2] ext4: Deprecate data=journal mount option

On Tue, 28 Jun 2011, Lukas Czerner wrote:

> Data journalling mode (data=journal) is known to be neglected by
> developers and only minority of people is actually using it. This
> mode is also less tested than the other two modes by the developers.
> 
> This creates a dangerous combination, because the option which seems
> *safer* is actually less safe the others. So this commit adds a warning
> message in case that data=journal mode is used, so the user is informed
> that the mode might be removed in the future.

Any comments on this ? Is that feasible to remove is someday ?

Thanks!
-Lukas

> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  fs/ext4/super.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 9ea71aa..9d189cf 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1631,6 +1631,11 @@ static int parse_options(char *options, struct super_block *sb,
>  			sbi->s_min_batch_time = option;
>  			break;
>  		case Opt_data_journal:
> +			ext4_msg(sb, KERN_WARNING,
> +				 "Using data=journal may be removed in the "
> +				 "future. Please, contact "
> +				 "linux-ext4@...r.kernel.org if you are "
> +				 "using this feature.");
>  			data_opt = EXT4_MOUNT_JOURNAL_DATA;
>  			goto datacheck;
>  		case Opt_data_ordered:
> 
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