>>  	spin_unlock(&cluster->lock);
quoted text
>>  
>> +	if (!ret)
>> +		return 0;
>> +
>> +	spin_lock(&block_group->tree_lock);
>> +
>> +	block_group->free_space -= bytes;
>> +	if (entry->bytes == 0) {
>> +		block_group->free_extents--;
>> +		kfree(entry);
>> +	}
>> +
>> +	spin_unlock(&block_group->tree_lock);
>> +
> 
> Move this part up so we don't drop the spinlock and then re-grab it.  Thanks,
> 

But they are 2 different locks. ;)

And we can't grab block_group->tree_lock when holding cluster->lock.
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