linux-ext4 - Re: [PATCH v2] NULL pointer when make_indexed

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Date:	Wed, 18 May 2011 08:23:42 -0700
From:	Allison Henderson <achender@...ux.vnet.ibm.com>
To:	Jan Kara <jack@...e.cz>
CC:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2] NULL pointer when make_indexed_dir returns -ENOSPC

On 5/17/2011 10:44 AM, Jan Kara wrote:
>    Hello,
>
> On Thu 12-05-11 10:59:20, Allison Henderson wrote:
>> I wasnt sure if people were expecting a v2 for this one, but I
>> noticed the modified version of v1 was removed from the tree, so I
>> am assuming we needed v2?  This one handles marking the buffer dirty
>> before calling do split to avoid the null pointer.  It introduces a
>> little overhead, but the only other option would be to introduce a
>> new flag set to do_split.  But if there's any one that would prefer
>> the flags to this solution, please let me know.  Thx! :)
>    The patch looks OK. Just please CC me next time - a) because ext3 needs a
> similar fix (added now) and b) because I was involved with the previous
> patch version. Thanks!
>
> 								Honza

Sure, I just thought I would save people from the extra spam since it 
was already seen, but I will keep you cc'd next time. Thx!

Allison Henderson

>> Signed-off-by: Allison Henderson<achender@...ibm.com>
>>
>> ---
>> :100644 100644 3c7a06e... b754b77... M	fs/ext4/namei.c
>>   fs/ext4/namei.c |    6 ++++--
>>   1 files changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
>> index 3c7a06e..b754b77 100644
>> --- a/fs/ext4/namei.c
>> +++ b/fs/ext4/namei.c
>> @@ -1413,6 +1413,10 @@ static int make_indexed_dir(handle_t *handle,
>> struct dentry *dentry,
>>   	frame->at = entries;
>>   	frame->bh = bh;
>>   	bh = bh2;
>> +
>> +	ext4_handle_dirty_metadata(handle, dir, frame->bh);
>> +	ext4_handle_dirty_metadata(handle, dir, bh);
>> +
>>   	de = do_split(handle,dir,&bh, frame,&hinfo,&retval);
>>   	if (!de) {
>>   		/*
>> @@ -1421,8 +1425,6 @@ static int make_indexed_dir(handle_t *handle,
>> struct dentry *dentry,
>>   		 * with corrupted filesystem.
>>   		 */
>>   		ext4_mark_inode_dirty(handle, dir);
>> -		ext4_handle_dirty_metadata(handle, dir, frame->bh);
>> -		ext4_handle_dirty_metadata(handle, dir, bh);
>>   		dx_release(frames);
>>   		return retval;
>>   	}
>> --
>> 1.7.1
>>
>> --
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