ZFS and __FreeBSD_version

[Boris Kochergin]

Pawel Jakub Dawidek wrote:
> On Thu, May 13, 2010 at 07:44:52AM -0400, John Baldwin wrote:
>   
>> Boris Kochergin wrote:
>>     
>>> Hi. Can __FreeBSD_version be bumped if ZFS's userland API is ever 
>>> changed again? I got slightly bitten by the 
>>> state_to_name()-to-zpool_state_to_name() change from version 6 to 
>>> version 13 and would like a reliable way of keeping track of this type 
>>> of stuff in the future. Thanks.
>>>       
>> Yes, it should be bumped anytime the API changes.  That is definitely a 
>> bug that it wasn't done properly last time.
>>     
>
> I must disagree here. libzfs API is for ZFS internal use only and is
> subject to change at any time. This is true for OpenSolaris as well.
> We, of course, can bump __FreeBSD_version if it helps, but one shouldn't
> expect libzfs API being stable or there is any care taken to maintain
> backward compatibility
Sure, I understand that it's unstable, but a different __FreeBSD_version 
for each time it changes (which isn't that often in FreeBSD) would allow 
my code to do the right thing to cope with it, at the preprocessor.

-Boris