linux-kernel - Re: [net-next PATCH v5 2/3] sysctl: add proc_do_large

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Message-ID: <4B85EC11.5030304@redhat.com>
Date:	Thu, 25 Feb 2010 11:18:41 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Octavian Purdila <opurdila@...acom.com>
CC:	David Miller <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [net-next PATCH v5 2/3] sysctl: add proc_do_large_bitmap

Cong Wang wrote:
> Octavian Purdila wrote:
>> On Wednesday 24 February 2010 07:24:00 you wrote:
>>> Octavian Purdila wrote:
>>>> Here is a new version of this patch which fixes both the comma and
>>>> invalid value issues, please give it a try.
>>> Sorry, it is even worse. :(
>>>
>>>> [net-next PATCH v5 2/3] sysctl: add proc_do_large_bitmap
>>>>
>>>> The new function can be used to read/write large bitmaps via /proc. A
>>>> comma separated range format is used for compact output and input
>>>> (e.g. 1,3-4,10-10).
>>> Writing "50000-50100" gets EINVAL, it should be success.
>>> Writing "50000,50100" fails too.
>>>
>>
>> Hmm, they don't fail for me :-/
>>
>>> Please, at least, do some basic testing.
>>>
>>
>> I do test them, I've attached the current test batch I was using.
>>
>> Anyways, today I've noticed that "1,2 3" does not fail and even more 
>> importantly the final value is "3".
>> Being that I don't see a way of fixing this without not acknowledging 
>> 1,2 even though we will do set these values, I revisited the "1 2 3" 
>> issue. And I don't understand why this is actually an issue, we are 
>> just being more permissive (i.e. we are allowing as separators both 
>> whitespaces and ,).
>>
>>
> 
> Oops, after rechecking my test case, it is actually my test case's
> fault. Sorry for this. I will fix my test case and run it again.
> 

Hi,

Still a small problem, if I do write(fd, "50000,50100", 12) I will
get a return value of 11, which should mean 11 bytes are written,
however, actually only the first 6 bytes are accepted.

The rest looks better now.

Or am I missing something here? :)

Thanks!
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