linux-ext4 - Re: [PATCH] ext4: Remove some deprecated mount options

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Date:	Wed, 29 Jun 2011 09:55:34 +0100
From:	Ric Wheeler <ricwheeler@...il.com>
To:	Andreas Dilger <adilger@...ger.ca>
CC:	Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org,
	tytso@....edu
Subject: Re: [PATCH] ext4: Remove some deprecated mount options

On 06/28/2011 05:35 PM, Andreas Dilger wrote:
> On 2011-06-28, at 9:53 AM, Lukas Czerner wrote:
>> Remove deprecated mount options bsddf, nogrpid, sysvgroups which has
>> been marked as deprecated since 2.6.23 and should be removed in 2.6.28.
>> However it is not a big deal because those are defaults anyway and the
>> options for setting their opposites still remains in kernel (however are
>> still deprecated). Also push the kernel version to remove those leftover
>> options further in time.
>>
>> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
>> index 9ea71aa..a75320e 100644
>> --- a/fs/ext4/super.c
>> +++ b/fs/ext4/super.c
>> @@ -1486,24 +1483,13 @@ static int parse_options(char *options, struct super_block *sb,
>> 		args[0].to = args[0].from = NULL;
>> 		token = match_token(p, tokens, args);
>> 		switch (token) {
>> -		case Opt_bsd_df:
>> -			ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
>> -			clear_opt(sb, MINIX_DF);
>> -			break;
>> 		case Opt_minix_df:
>> -			ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
>> +			ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "3.5");
>> 			set_opt(sb, MINIX_DF);
>> -
>> 			break;
>> 		case Opt_grpid:
>> -			ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
>> +			ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "3.5");
>> 			set_opt(sb, GRPID);
>> -
>> -			break;
>> -		case Opt_nogrpid:
>> -			ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
>> -			clear_opt(sb, GRPID);
> One problem is that these options haven't been deprecated in major vendor
> releases (e.g. 2.6.32 for RHEL6 and SLES11), which is what most people are
> using.  I think that they should be deprecated for at least one major
> vendor release before being removed, otherwise it is nearly the same as just
> deleting them on some random kernel version without telling anyone.
>
> I'm not sure where you got "2.6.23" and "2.6.28" from, maybe you meant "2.6.33",
> which is unfortunately just after the cutoff for both RHEL6 and SLES11SP1.
>
>
> Cheers, Andreas
>

I am not sure that I follow the concern - people who use upstream follow that, 
people who use vendor kernels get some branched version of something old.

In fact, we try hard *not* to do things in RHEL kernels that are not upstream 
first. I would be perfectly happy to drop it upstream first and then deprecate 
it in a future RHEL release.

Thanks!

Ric

(and Lukas is *very* familiar with which kernel the ext4 code was lifted from :))

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