linux-ext4 - Re: [PATCH] ext4: release page cache in ext4_mb_load

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Date:	Thu, 14 Apr 2011 16:28:45 +0800
From:	Yang Rui Rui <ruirui.r.yang@...to.com>
To:	Amir Goldstein <amir73il@...il.com>
CC:	Yang Ruirui R <ruirui.r.yang@...toenator.com>,
	"tytso@....edu" <tytso@....edu>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: release page cache in ext4_mb_load_buddy error
 path

On 04/14/2011 03:46 PM, Amir Goldstein wrote:
> On Thu, Apr 14, 2011 at 10:29 AM, Yang Rui Rui<ruirui.r.yang@...to.com>  wrote:
>> Hi,
>>
>> Thanks for your comment. BTW, why linux-kernel mainling list is removed from
>> cc?
>> Is it ext4 list prefer or something else?
>
> ext4 list is the place to post fixes for ext4.
> LKML need not be bothered with these specific patches.
>
>>
>> On 04/14/2011 03:01 PM, Amir Goldstein wrote:
>>>
>>> Hi Yang ,
>>>
>>> The patch looks correct, but in my opinion a nicer fix would be to set
>>> e4b->bd_bitmap_page = page;
>>> or
>>> e4b->bd_buddy_page = page;
>>> right after assigning a new value to the temp variable 'page'.
>>> and keeping the cleanup code in the error path as it is.
>>>
>>> It's a matter of taste and code readability.
>>
>> I agree with you for common case, but this function is not so readable
>> already.
>> Two many if conditions and indent. I would prefer just fix this problem as
>> this patch.
>
> As I said it's a matter of taste so I'm not going to argue.
> One argument in favor of your patch is that it adds fewer lines.
>
>> Then rewrite the function as more small size functions for example the get
>> page part.
>>
>
> If you are going to audit code or rework functions in mballoc.c,
> I suggest that you first take look at my patches to remove alloc_semp.
> Those already involve some rework in mballoc.c.
> See online version at:
> https://github.com/amir73il/ext4-snapshots/tree/alloc_semp

Thanks, will take a look.

>
>>>
>>> Amir.
>>>
>>> On Thu, Apr 14, 2011 at 9:44 AM, Yang Ruirui<ruirui.r.yang@...to.com>
>>>   wrote:
>>>>
>>>> Add missing page_cache_release in the error path of ext4_mb_load_buddy
>>>>
>>>> Signed-off-by: Yang Ruirui<ruirui.r.yang@...to.com>


-- 
Thanks
Yang Ruirui
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