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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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:
> Because these files are dynamically generated it makes no sense to
> install them. There are quite a few files like these which are used
> during the kernel generation process to dynamically create include
> files. This allows greater flexibility.
>
> Thanks Gary. I appreciate your help.
The usual question here is "what are you trying to do?". Normally we
dynamically generate the implementations of the VOP interfaces when the kernel
(or a module built independently from the kernel) depends on them. If you're
creating a kernel module, you can add a dependency on vnode_if.h, which will
cause the kernel module build framework to generate local copies of the file
in your build directory during the build, as seen in the Coda module:
# $FreeBSD: src/sys/modules/coda/Makefile,v 1.17.2.1 2008/03/14 17:12:40 rwatson Exp $
.PATH: ${.CURDIR}/../../fs/coda
KMOD= coda
SRCS= vnode_if.h \
coda_fbsd.c coda_psdev.c coda_subr.c coda_venus.c coda_vfsops.c \
coda_vnops.c opt_coda.h
.include <bsd.kmod.mk>
If it's for the purposes of debugging a kernel, you should be able to find the
generated copies of the files in the build directory for the kernel.
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.
I really appreciate your help.
I am also trying to figure out a zero copy approach to kernel memory access from user space. Would you happen to know which list I should post the question to?
Have a great holiday all.
Thanks,
Gerry
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