linux-kernel - Re: [PATCH] To add NULL pointer check

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Date:	Wed, 3 Apr 2013 12:09:52 +0530 (IST)
From:	P J P <ppandit@...hat.com>
To:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Petr Matousek <pmatouse@...hat.com>
Subject: Re: [PATCH] To add NULL pointer check

  Hello Jaegeuk,
+-- On Wed, 3 Apr 2013, Jaegeuk Kim wrote --+
| Therefore, I think f2fs_write_data_pages() is better to handle this. Please 
| review the modified patch. Thanks,
| 
| diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
| index 47a2d7c..cf9ff5f 100644
| --- a/fs/f2fs/data.c
| +++ b/fs/f2fs/data.c
| @@ -559,6 +559,10 @@ static int f2fs_write_data_pages(struct
| address_space *mapping,
|  	int ret;
|  	long excess_nrtw = 0, desired_nrtw;
|  
| +	/* deal with chardevs and other special file */
| +	if (!mapping->a_ops->writepage)
| +		return 0;
| +
|  	if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) {
|  		desired_nrtw = MAX_DESIRED_PAGES_WP;
|  		excess_nrtw = desired_nrtw - wbc->nr_to_write;
| 

  Yeah, I considered this, it saves us a call to `write_cache_pages'; But then 
thought it'll help if `__f2fs_writepage' is called from other place later.

I agree, above patch serves too.

Thank you.
--
Prasad J Pandit / Red Hat Security Response Team
DB7A 84C5 D3F9 7CD1 B5EB  C939 D048 7860 3655 602B
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