linux-kernel - Re: [RFC PATCH ext3/ext4] orphan list corruption due bad inode

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Message-ID: <4664FE80.4080801@sw.ru>
Date:	Tue, 05 Jun 2007 10:11:12 +0400
From:	Vasily Averin <vvs@...ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, linux-ext4@...r.kernel.org,
	Stephen Tweedie <sct@...hat.com>, adilger@...sterfs.com
Subject: Re: [RFC PATCH ext3/ext4] orphan list corruption due bad inode

Andrew Morton wrote:
> On Mon, 04 Jun 2007 09:19:10 +0400 Vasily Averin <vvs@...ru> wrote:
>> diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
>> index 9bb046d..e3ac8c3 100644
>> --- a/fs/ext3/namei.c
>> +++ b/fs/ext3/namei.c
>> @@ -1019,6 +1019,11 @@ static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, str
>>  
>>  		if (!inode)
>>  			return ERR_PTR(-EACCES);
>> +
>> +		if (is_bad_inode(inode)) {
>> +			iput(inode);
>> +			return ERR_PTR(-ENOENT);	
>> +		}
>>  	}
>>  	return d_splice_alias(inode, dentry);
>>  }
> Seems reasonable.  So this prevents the bad inodes from getting onto the
> orphan list in the first place?

make_bad_inode() is called from ext3_read_inode() that is called from iget() only.

When we found that inode is bad we will call iput ASAP. I expect it should be
enough to exclude any chances to call any functions that can include this inode
into orphan list.

ext3_lookup
  iget
    ext3_read_inode
       make_bad_inode
  is_bad_inode? --> iput

However am I probably err?

Probably is better to add is_bad_inode check to ext3_orphan_add()?

thank you,
	Vasily Averin
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