linux-kernel - Re: [GIT BISECT] first bad commit: 1f36f774 Switch !O_CREAT case to use of do

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Date:	Wed, 24 Mar 2010 19:15:15 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	pNFS Mailing List <pnfs@...ux-nfs.org>,
	Benny Halevy <bhalevy@...asas.com>,
	"J. Bruce Fields" <bfields@...i.umich.edu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [GIT BISECT] first bad commit: 1f36f774 Switch !O_CREAT case
 to use of do_last()

On 03/24/2010 06:39 PM, Al Viro wrote:
> On Wed, Mar 24, 2010 at 06:10:52PM +0200, Boaz Harrosh wrote:
>> On 03/24/2010 06:07 PM, Al Viro wrote:
>>> On Wed, Mar 24, 2010 at 06:04:56PM +0200, Boaz Harrosh wrote:
>>>>> Bloody impressive...  Does that happen to underlying fs or to what you
>>>>> are seeing via NFS?
>>>>
>>>> Only via NFS. All local access is fine.
>>>>
>>>> After the corruption above I can cd to the local mount cp a fresh copy
>>>> of .git/index file and play around just fine.
>>>> Once I return to the NFS mounted directory, a git status will do it.
>>>> It does not matter if caches are cold (Takes a long time) or hot it happens
>>>> every time.
>>>>
>>>> Weird I know, I'm playing some more with it as we speak
>>>
>>> What happens if you export to box running older kernel *or* from box
>>> running older kernel?  IOW, is that nfsd or nfs client getting unhappy?
>>> I'd suspect the latter, but...
>>
>>
>> Good question, I'm just getting to that because currently it's all
>> over localhost (same kernel, BTW inside a UML)
>>
>> I will try what you said. Please through any other tests on me, if needed.
> 

As you suspected old-server+new-client fails. any-thing+old-client is
fine. (two separate machines this time)

> Very interesting...  Just to see which path we are hitting: add
> 	if (IS_ERR(nd->intent.open.file))
> 		printk("foo: %s", pathname);
> right after
>                 error = do_lookup(nd, &nd->last, path);
>                 if (error)
>                         goto exit;
> in fs/namei.c:do_last() and see whether we are hitting it or not on objects
> that get corrupted.

Sorry was busy shifting setups, didn't see your mail, will do that next ...

Thanks
Boaz
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