linux-kernel - Re: [patch 2/4] vfs: filp is never NULL in do_generic_file

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Date:	Thu, 31 Jul 2008 15:30:23 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	Miklos Szeredi <miklos@...redi.hu>, viro@...IV.linux.org.uk,
	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/4] vfs: filp is never NULL in do_generic_file_read()

KOSAKI Motohiro wrote:
>>  	*ppos = ((loff_t)index << PAGE_CACHE_SHIFT) + offset;
>> -	if (filp)
>> -		file_accessed(filp);
>> +	file_accessed(filp);
>>  }
>>  
>>  int file_read_actor(read_descriptor_t *desc, struct page *page,
> 
> if filp is never NULL, BUG_ON is better?
> 

static inline void file_accessed(struct file *file)
{
	if (!(file->f_flags & O_NOATIME))
		...
}

So if filp is NULL, we'll get a noisy NULL dereference bug immediately,
so BUG_ON() is not needed.


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