Re: [PATCH v13 01/10] xfs: Add helper xfs_attr_node_remove_step

[Allison Henderson <allison.henderson@oracle.com>]

On 10/27/20 5:15 AM, Brian Foster wrote:
> On Thu, Oct 22, 2020 at 11:34:26PM -0700, Allison Henderson wrote:
>> From: Allison Collins <allison.henderson@oracle.com>
>>
>> This patch adds a new helper function xfs_attr_node_remove_step.  This
>> will help simplify and modularize the calling function
>> xfs_attr_node_remove.
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> ---
>>   fs/xfs/libxfs/xfs_attr.c | 46 ++++++++++++++++++++++++++++++++++------------
>>   1 file changed, 34 insertions(+), 12 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
>> index fd8e641..f4d39bf 100644
>> --- a/fs/xfs/libxfs/xfs_attr.c
>> +++ b/fs/xfs/libxfs/xfs_attr.c
> ...
>> @@ -1267,18 +1262,45 @@ xfs_attr_node_removename(
>>   	if (retval && (state->path.active > 1)) {
>>   		error = xfs_da3_join(state);
>>   		if (error)
>> -			goto out;
>> +			return error;
>>   		error = xfs_defer_finish(&args->trans);
>>   		if (error)
>> -			goto out;
>> +			return error;
>>   		/*
>>   		 * Commit the Btree join operation and start a new trans.
>>   		 */
>>   		error = xfs_trans_roll_inode(&args->trans, dp);
>>   		if (error)
>> -			goto out;
>> +			return error;
>>   	}
>>   
>> +	return error;
>> +}
>> +
>> +/*
>> + * Remove a name from a B-tree attribute list.
>> + *
>> + * This routine will find the blocks of the name to remove, remove them and
>> + * shirnk the tree if needed.
>> + */
>> +STATIC int
>> +xfs_attr_node_removename(
>> +	struct xfs_da_args	*args)
>> +{
>> +	struct xfs_da_state	*state;
> 
> It urks me a little bit that we have to dig down into a couple functions
> to grok that state allocation is the first step or otherwise occurs
> before we potentially use the error path. Since we already check for
> state in the out path, can we just initialize this as *state = NULL
> here so the logic is clear? Otherwise the patch LGTM:
> 
Sure, will add.  Thanks!

Allison
> Reviewed-by: Brian Foster <bfoster@redhat.com>
> 
>> +	int			error;
>> +	struct xfs_inode	*dp = args->dp;
>> +
>> +	trace_xfs_attr_node_removename(args);
>> +
>> +	error = xfs_attr_node_removename_setup(args, &state);
>> +	if (error)
>> +		goto out;
>> +
>> +	error = xfs_attr_node_remove_step(args, state);
>> +	if (error)
>> +		goto out;
>> +
>>   	/*
>>   	 * If the result is small enough, push it all into the inode.
>>   	 */
>> -- 
>> 2.7.4
>>
>