linux-kernel - Re: [PATCH v4 3/4] fat (exportfs): rebuild directory-inode if fat

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Message-ID: <87r4p0417r.fsf@devron.myhome.or.jp>
Date:	Mon, 15 Oct 2012 16:57:12 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	akpm@...ux-foundation.org, bfields@...ldses.org,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v4 3/4] fat (exportfs): rebuild directory-inode if fat_dget() fails

Namjae Jeon <linkinjeon@...il.com> writes:

>> OK, I think I got where is wrong. If it is the subdir of rootdir,
>> fat_dget() should get the inode of root?
> That is correct. Whenever fat_dget() is called for sub-directories
> which is in root folder, we assign root inode as parent inode.
>>
>> So, I guess if parent_logstart == 0, it is BUG().
> Would you explain more why you think it is BUG() ?

Because root dentry is never expired until umount. So, fat_dget()
shouldn't never fail to get inode for subdir of rootdir. Otherwise,
"stale_rw" will not be working in the case even if there is cache.

I.e. I think we don't need to check parent_logstart == 0.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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