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Date: Thu, 18 Nov 2010 09:02:25 +0100
From: Jes Sorensen <Jes.Sorensen@redhat.com>
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Subject: [Qemu-devel] Re: [PATCH v4] virtio-9p: fix build on
	!CONFIG_UTIMENSAT
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To: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Blue Swirl <blauwirbel@gmail.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "Hao,
	Xudong" <xudong.hao@intel.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Chris Wright <chrisw@sous-sol.org>, "M. Mohan Kumar" <mohan@in.ibm.com>, Avi Kivity <avi@redhat.com>

On 11/18/10 01:41, Hidetoshi Seto wrote:
> This patch introduce a fallback mechanism for old systems that do not
> support utimensat().  This fix build failure with following warnings:
> 
> hw/virtio-9p-local.c: In function 'local_utimensat':
> hw/virtio-9p-local.c:479: warning: implicit declaration of function 'utimensat'
> hw/virtio-9p-local.c:479: warning: nested extern declaration of 'utimensat'
> 
> and:
> 
> hw/virtio-9p.c: In function 'v9fs_setattr_post_chmod':
> hw/virtio-9p.c:1410: error: 'UTIME_NOW' undeclared (first use in this function)
> hw/virtio-9p.c:1410: error: (Each undeclared identifier is reported only once
> hw/virtio-9p.c:1410: error: for each function it appears in.)
> hw/virtio-9p.c:1413: error: 'UTIME_OMIT' undeclared (first use in this function)
> hw/virtio-9p.c: In function 'v9fs_wstat_post_chmod':
> hw/virtio-9p.c:2905: error: 'UTIME_OMIT' undeclared (first use in this function)
> 
> v4:
>   - Use tv_now.tv_usec
>   - Rebased on latest qemu.git
> v3:
>   - Use better alternative handling for UTIME_NOW/OMIT
>   - Move qemu_utimensat() to cutils.c
> V2:
>   - Introduce qemu_utimensat()
> 
> Acked-by: Chris Wright <chrisw@sous-sol.org>
> Acked-by: M. Mohan Kumar <mohan@in.ibm.com>
> Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>

Hi Hidetoshi,

I think the idea of the patch is good, but please move qemu_utimensat()
to oslib-posix.c and provide a wrapper for oslib-win32.c. It is
emulation for a system library function, so it doesn't belong in
cutils.c, but rather in the oslib group.

Thanks,
Jes