linux-kernel - Re: [PATCH v2 2/4] ocfs2: sysfile interfaces for online file check

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Message-ID: <56553A20.9060605@oracle.com>
Date:	Wed, 25 Nov 2015 12:33:36 +0800
From:	Junxiao Bi <junxiao.bi@...cle.com>
To:	Mark Fasheh <mfasheh@...e.de>
Cc:	Gang He <ghe@...e.com>, rgoldwyn@...e.de,
	akpm@...ux-foundation.org, ocfs2-devel@....oracle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] ocfs2: sysfile interfaces for online file check

On 11/25/2015 05:46 AM, Mark Fasheh wrote:
> On Tue, Nov 03, 2015 at 04:20:27PM +0800, Junxiao Bi wrote:
>> Hi Gang,
>>
>> On 11/03/2015 03:54 PM, Gang He wrote:
>>> Hi Junxiao,
>>>
>>> Thank for your reviewing.
>>> Current design, we use a sysfile as a interface to check/fix a file (via pass a ino number).
>>> But, this operation is manually triggered by user, instead of automatically  fix in the kernel.
>>> Why?
>>> 1) we should let users make this decision, since some users do not want to fix when encountering a file system corruption, maybe they want to keep the file system unchanged for a further investigation.
>> If user don't want this, they should not use error=continue option, let
>> fs go after a corruption is very dangerous.
> 
> Maybe we need another errors=XXX flag (maybe errors=fix)?
Sound great. This is a good option since user may have not enough
knowledge whether to fix the found issue.

Thanks,
Junxiao.
> 
> You both make good points, here's what I gather from the conversation:
> 
>  - Some customers would be sad if they have to manually fix corruptions.
>    This takes effort on their part, and if the FS can handle it
>    automatically, it should.
> 
>  - There are valid concerns that automatically fixing things is a change in
>    behavior that might not be welcome, or worse might lead to unforseeable
>    circumstances.
> 
>  - I will add that fixing things automatically implies checking them
>    automatically which could introduce some performance impact depending on
>    how much checking we're doing.
> 
> So if the user wants errors to be fixed automatically, they could mount with
> errros=fix, and everyone else would have no change in behavior unless they
> wanted to make use of the new feature.
> 
> 
>>> 2) frankly speaking, this feature will probably bring a second corruption if there is some error in the code, I do not suggest to use automatically fix by default in the first version.
>> I think if this feature could bring more corruption, then this should be
>> fixed first.
> 
> Btw, I am pretty sure that Gang is referring to the feature being new and
> thus more likely to have problems. There is nothing I see in here that is
> file system corrupting.
> 	--Mark
> 
> 
> --
> Mark Fasheh
> 

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