linux-kernel - Re: [PATCH v2 2/2] staging: erofs: complete POSIX ACL support

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Date:   Fri, 15 Feb 2019 10:10:34 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>, Chao Yu <chao@...nel.org>
CC:     <devel@...verdev.osuosl.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-erofs@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>, <weidu.du@...wei.com>,
        Miao Xie <miaoxie@...wei.com>
Subject: Re: [PATCH v2 2/2] staging: erofs: complete POSIX ACL support

Hi Dan,

Any suggestion?

On 2019/2/3 10:52, Chao Yu wrote:
> Sorry for the delay due to business travel.
> 
> On 2019/1/29 2:30, Dan Carpenter wrote:
>> On Tue, Jan 29, 2019 at 12:41:55AM +0800, Chao Yu wrote:
>>> Hi Dan and Xiang,
>>>
>>> On 2019-1-28 21:48, Gao Xiang wrote:
>>>> Hi Dan,
>>>>
>>>> On 2019/1/28 21:33, Dan Carpenter wrote:
>>>>> Hopefully, regular kmalloc() is enough.
>>>>>
>>>>> Do really need the erofs_kmalloc() function?  Regular kmalloc() has
>>>>> fault injection already.  Have you tried to use it?
>>>
>>> Yes, I think we'd better to use erofs_kmalloc(). :)
>>>
>>> Actually, fault injection in erofs_kmalloc only affect erofs module, we can
>>> expect that the range of fault can be limited in erofs code, rather than whole
>>> kernel, so the test point can be aimed at more accurately.
>>>
>>
>> Are you serious?  The standard fault injection doesn't do that???
> 
> Oh, I just realized the common fault injection can inject into specified
> module with function granularity, sorry.
> 
>>
>> Please fix it instead of creating a duplicate better implementation
>> which only your filesystem can use.  I would have thought that obviously
> 
> I agreed that it will be good to make common fault injection better,
> covering more cases, so that it can benefit all modules which need fault
> injection functionality. But rather than injecting kmalloc, there will be
> other injection demands from erofs/f2fs, like injecting in the middle of
> their specified function, how could we do that? Could you give us advice?
> 
> Thanks,
> 
>> any fault injection framework could at least be configured to test
>> specific code...
>>
>> regards,
>> dan carpenter
>>
>>
>> .
>>
> 
> 
> .
>