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

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Message-ID: <87r4p271uw.fsf@devron.myhome.or.jp>
Date:	Sun, 14 Oct 2012 01:50:31 +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:

>>>>> +     if (!fat_get_dotdot_entry(child_dir->d_inode, &dotdot_bh, &de)) {
>>>>> +             parent_logstart = fat_get_start(sbi, de);
>>>>>               parent_inode = fat_dget(sb, parent_logstart);
>>>>> +             if (parent_inode || sbi->options.nfs != FAT_NFS_NOSTALE_RO)
>>>>> +                     goto out;
>>>>> +             if (!parent_logstart)
>>>>> +                     /*logstart of dotdot entry is zero if
>>>>> +                     * if the directory's parent is root
>>>>> +                     */
>>>>> +                     parent_inode = sb->s_root->d_inode;
>>>>
>>>> get_parent() should not be called for root dir, right?
>>> Yes.
>>
>> Ah, actual question was - subdir of root can be passed to this? I guess
>> it is possible...
> Yes, you're right.

OK, I think I got where is wrong. If it is the subdir of rootdir,
fat_dget() should get the inode of root?

So, I guess if parent_logstart == 0, it is BUG().
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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