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

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Date:	Thu, 14 Apr 2011 15:29:38 +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

Hi,

Thanks for your comment. BTW, why linux-kernel mainling list is removed from cc?
Is it ext4 list prefer or something else?

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.
Then rewrite the function as more small size functions for example the get page part.

>
> 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>
>> ---
>> �fs/ext4/mballoc.c | � �2 ++
>> �1 file changed, 2 insertions(+)
>>
>> --- linux-2.6.orig/fs/ext4/mballoc.c � �2011-04-14 14:04:48.000000000 +0800
>> +++ linux-2.6/fs/ext4/mballoc.c 2011-04-14 14:33:28.702958245 +0800
>> @@ -1273,6 +1273,8 @@ repeat_load_buddy:
>> � � � �return 0;
>>
>> �err:
>> + � � � if (page)
>> + � � � � � � � page_cache_release(page);
>> � � � �if (e4b->bd_bitmap_page)
>> � � � � � � � �page_cache_release(e4b->bd_bitmap_page);
>> � � � �if (e4b->bd_buddy_page)
>> --
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-- 
Thanks
Yang Ruirui
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