On 2015-07-09 08:41, Sander wrote:
> Austin S Hemmelgarn wrote (ao):
>>> What's wrong with "btrfs subvolume snapshot"?
>>
>> Well, personally I would say the fact that once something is tagged as
>> a snapshot, you can't change it to a regular subvolume without doing a
>> non-incremental send/receive.
>
> A snapshot is a subvolume. There is no such thing as "tagged as a
> snapshot".
>
> 	Sander
>
No, there is a bit in the subvolume metadata that says whether it's 
considered a snapshot or not.  Internally, they are handled identically, 
but it does come into play when you consider things like btrfs subvolume 
show -s (which only lists snapshots), which in turn means that certain 
tasks are more difficult to script robustly.