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Date:      Sat, 29 Dec 2012 20:43:56 -0800
From:      mdf@FreeBSD.org
To:        Benjamin Kaduk <bjkfbsd@gmail.com>
Cc:        svn-src-stable@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, "Robert N. M. Watson" <rwatson@freebsd.org>, svn-src-stable-9@freebsd.org
Subject:   Re: svn commit: r244663 - stable/9
Message-ID:  <CAMBSHm8fKkxMJZiAxhrO=5tqidEe2LwoqpNGOWvcd0WGJPrPPw@mail.gmail.com>
In-Reply-To: <CAJ5_RoBPdENKazPZT4vXibcfN_BUhVViHvOvu0CqcaPx0q1Jvw@mail.gmail.com>
References:  <201212241422.qBOEMrcF021632@svn.freebsd.org> <CAJ-VmokV-JL_xZ9otRXubKZ8KQKe7GgLuLU3UMij0HUD_KhCNw@mail.gmail.com> <50D8B533.8080507@mu.org> <20121225104422.GB53644@kib.kiev.ua> <alpine.BSF.2.00.1212251911360.56707@fledge.watson.org> <CAJ-Vmo=oYfzxwEDYnXotx4b8qvnQTr4ofrLRkwkKH5C9GB0sMg@mail.gmail.com> <00E4FFFA-8ADB-4D43-B977-3834C48133E4@freebsd.org> <CAJ5_RoBPdENKazPZT4vXibcfN_BUhVViHvOvu0CqcaPx0q1Jvw@mail.gmail.com>

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On Sat, Dec 29, 2012 at 6:38 PM, Benjamin Kaduk <bjkfbsd@gmail.com> wrote:
> On Sat, Dec 29, 2012 at 5:44 AM, Robert N. M. Watson <rwatson@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



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