Date: Tue, 23 Dec 2008 14:16:26 -0600 From: "Gerry Weaver" <gerryw@compvia.com> To: "Robert Watson" <rwatson@FreeBSD.org> Cc: freebsd-fs@freebsd.org Subject: Re: Headers files included by vnode.h Message-ID: <20081223201626.caa483ad@mail01.compvia.com> In-Reply-To: alpine.BSF.1.10.0812231138272.90302@fledge.watson.org
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=5F=5F=5F=5F=5F =20
From: Robert Watson [mailto:rwatson@FreeBSD.org]
To: Gerry Weaver [mailto:gerryw@compvia.com]
Cc: gary.jennejohn@freenet.de, freebsd-fs@freebsd.org
Sent: Tue, 23 Dec 2008 05:41:13 -0600
Subject: Re: Headers files included by vnode.h
On Mon, 22 Dec 2008, Gerry Weaver wrote:
=20
> Because these files are dynamically generated it makes no sense to
> install them. There are quite a few files like these which are use=
d
> during the kernel generation process to dynamically create include
> files. This allows greater flexibility.
>
> Thanks Gary. I appreciate your help.
=20
The usual question here is "what are you trying to do=3F". Normally w=
e=20
dynamically generate the implementations of the VOP interfaces when th=
e kernel=20
(or a module built independently from the kernel) depends on them. If=
you're=20
creating a kernel module, you can add a dependency on vnode=5Fif.h, wh=
ich will=20
cause the kernel module build framework to generate local copies of th=
e file=20
in your build directory during the build, as seen in the Coda module:
=20
# $FreeBSD: src/sys/modules/coda/Makefile,v 1.17.2.1 2008/03/14 17:=
12:40 rwatson Exp $
=20
.PATH: ${.CURDIR}/../../fs/coda
=20
KMOD=3D coda
SRCS=3D vnode=5Fif.h \
coda=5Ffbsd.c coda=5Fpsdev.c coda=5Fsubr.c coda=5Fvenus.c c=
oda=5Fvfsops.c \
coda=5Fvnops.c opt=5Fcoda.h
=20
.include <bsd.kmod.mk>
=20
If it's for the purposes of debugging a kernel, you should be able to =
find the=20
generated copies of the files in the build directory for the kernel.
=20
Robert N M Watson
Computer Laboratory
University of CambridgeHi Robert,
Perfect. Yes, I am building a kernel module. This is exactly what I was =
looking for.=20
I really appreciate your help.=20
I am also trying to figure out a zero copy approach to kernel memory acc=
ess from user space. Would you happen to know which list I should post t=
he question to=3F
Have a great holiday all.
Thanks,
Gerry
=20
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