svn commit: r244663 - stable/9

[mdf at FreeBSD.org]

On Sat, Dec 29, 2012 at 6:38 PM, Benjamin Kaduk <bjkfbsd at gmail.com> wrote:
> On Sat, Dec 29, 2012 at 5:44 AM, Robert N. M. Watson <rwatson at freebsd.org>
> wrote:
>>
>> When we talked to various VFS maintainers, looked at the past change
>> history there, and looked at the set of third-party file systems
>> (especially, those we could see in ports), the consensus there was that it
>> was too difficult to define a stable VFS KPI and KBI for third-party
>> modules. In particular, there appear to be at most one or two in ports at
>> any given moment, and quick analyses of them suggested that their kernel
>> feature dependency footprint was far more than just "vnode operations".
>
>
> If OpenAFS is the only out-of-tree filesystem in ports, then most definitely
> there are far more dependencies in place.  I don't know how closely Isilon's
> stuff keeps to our models

KBI/ABI are not relevant for Isilon since we build universe every
time.  Changes to the KPI need to be tracked, of course.

I don't know if there are other vendors with a custom filesystem who
are not shipping a whole system (NetApp has a pretty odd use case
AFAIK).

Cheers,
matthew