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Date:      Sat, 29 Dec 2012 21:38:33 -0500
From:      Benjamin Kaduk <bjkfbsd@gmail.com>
To:        "Robert N. M. Watson" <rwatson@freebsd.org>
Cc:        svn-src-stable@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, svn-src-stable-9@freebsd.org
Subject:   Re: svn commit: r244663 - stable/9
Message-ID:  <CAJ5_RoBPdENKazPZT4vXibcfN_BUhVViHvOvu0CqcaPx0q1Jvw@mail.gmail.com>
In-Reply-To: <00E4FFFA-8ADB-4D43-B977-3834C48133E4@freebsd.org>
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>

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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, though I do seem to recall that
at least their style guide has some differences from ours.

At the devsummit in 2011 in Ottawa, I did go through and look up what
kernel changes had caused a need for the OpenAFS module to be recompiled on
the stable branches, and I think most of them were not really VFS-related,
but rather networking related.  (I no longer have the list handy, sadly.)

-Ben



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