Re: [PATCH v4 3/4] fat: add renameat2 RENAME_EXCHANGE flag support

[Javier Martinez Canillas <javierm@redhat.com>]

On 6/8/22 16:33, OGAWA Hirofumi wrote:
> Javier Martinez Canillas <javierm@redhat.com> writes:
> 
>> +	/* update ".." directory entry info */
>> +	if (old_dotdot_de) {
>> +		err = vfat_update_dotdot_de(new_dir, old_inode, old_dotdot_bh,
>> +					    old_dotdot_de);
>> +		if (err)
>> +			goto error_old_dotdot;
>> +		drop_nlink(old_dir);
>> +		inc_nlink(new_dir);
>> +	}
>> +
>> +	if (new_dotdot_de) {
>> +		err = vfat_update_dotdot_de(old_dir, new_inode, new_dotdot_bh,
>> +					    new_dotdot_de);
>> +		if (err)
>> +			goto error_new_dotdot;
>> +		drop_nlink(new_dir);
>> +		inc_nlink(old_dir);
>> +	}
> 
> Probably, we should change the nlink only if both of dotdot update are
> succeed and different file type. Otherwise, we would have to revert the
> nlink change on error path (and can remove unnecessary update as bonus).
> 

Agreed. I'll wait a few days before posting v5 in case you have more
comments on the other patches.

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat