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Date:      Sat, 29 Dec 2012 16:56:23 +0200
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        "Robert N. M. Watson" <rwatson@freebsd.org>
Cc:        Adrian Chadd <adrian@freebsd.org>, src-committers@freebsd.org, Peter Wemm <peter@wemm.org>, svn-src-stable@freebsd.org, svn-src-all@freebsd.org, Alfred Perlstein <bright@mu.org>, svn-src-stable-9@freebsd.org
Subject:   Re: svn commit: r244663 - stable/9
Message-ID:  <20121229145623.GB82219@kib.kiev.ua>
In-Reply-To: <C256AEF0-E68E-4C15-9A00-3465C89DD51D@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> <CAGE5yCp1oVe74_8wot8rJe5BU9uOHyfLipUN0cFtCC77CLo8hA@mail.gmail.com> <50DE74F1.70105@mu.org> <C256AEF0-E68E-4C15-9A00-3465C89DD51D@freebsd.org>

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On Sat, Dec 29, 2012 at 10:49:59AM +0000, Robert N. M. Watson wrote:
>=20
> On 29 Dec 2012, at 04:43, Alfred Perlstein wrote:
>=20
> > Yes.  Kib and I chatted offline, it seems that the SOP is really "there=
 is no guarantee about KPI when talking about VFS" so the headache that it =
would be to write the shim layer and maintain it (particularly considering =
the 9.x release cycle slowness) was not worth it.
> >=20
> > In a few days I'm going to blow up the extra entries in VFSOPS and VOPS=
 by some 10 entries to hopefully keep us KPI friendly for the next release.=
  I may also introduce a VFS_KPI version number.  Let me know if you have a=
ny thoughts on that, my thoughts are basically to make it like FreeBSD_vers=
ion, and eventually someone can add macros for VFS klds to refuse to load d=
epending on VFS_KPI.
>=20
> I don't think stub entries hurt.
>=20
> But I think a VFS_KPI version number is premature.
We have the version number for eons, but it is unusable because there is
no defined VFS KPI. See VFS_VERSION in the sys/sys/mount.h and its use
for the module loading and filesystem registrations.

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