zfs code - Feb 2008 - Adding to arc_buf_hdr_t

If I add a new field to arc_buf_hdr_t this has a version impact right?

I think I need to add a field to it for dealing with encryption of the
L2ARC.

I''m assuming it should be added at the end and any assignment or
reference to it should be guarded with the usual style of version check
?  Is that sufficient ?

-- 
Darren J Moffat

The arc_buf_hdr_t is an in-core-only data structure, so it has no
version impact.  It does not matter where you add an extra field.

However, only add a field to this structure if you really need it...
increasing the size of this struct will likely have a negative
performance impact on the ARC.

-Mark

Darren J Moffat wrote:
> If I add a new field to arc_buf_hdr_t this has a version impact right?
> 
> I think I need to add a field to it for dealing with encryption of the
> L2ARC.
> 
> I''m assuming it should be added at the end and any assignment or
> reference to it should be guarded with the usual style of version check
> ?  Is that sufficient ?
>