Re: [Qemu-devel] [PATCH] virtio-9p-handle: define AT_EMPTY_PATH if needed

[Serge Hallyn <serge.hallyn@canonical.com>]

Quoting Aneesh Kumar K.V (aneesh.kumar@linux.vnet.ibm.com):
> Serge Hallyn <serge.hallyn@canonical.com> writes:
> 
> > If AT_EMPTY_PATH is not in one of the included files, go ahead and
> > define it.  qemu won't compile on ubuntu for me without this.
> >
> > (Note - alternatively we could #include <linux/fcntl.h> to pick
> > up the definitions there)
> 
> Then why don't we do that ? I do get the below errors
> 
> In file included from /usr/include/x86_64-linux-gnu/asm/fcntl.h:1:0,
>                  from /usr/include/linux/fcntl.h:4,
>                  from /home/opensource/sources/qemu/qemu-upstream/hw/9pfs/virtio-9p-handle.c:28:
> /usr/include/asm-generic/fcntl.h:127:8: error: redefinition of ‘struct f_owner_ex’
> /usr/include/x86_64-linux-gnu/bits/fcntl.h:204:8: note: originally defined here
> In file included from /usr/include/x86_64-linux-gnu/asm/fcntl.h:1:0,
>                  from /usr/include/linux/fcntl.h:4,
> 
> Are they do to ubuntu multi-arch changes ? 

I don't think so.  I got these awhile ago as well.  The libc and linux
headers simply don't seem to be compatible.

> >
> > Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
> > ---
> >  hw/9pfs/virtio-9p-handle.c |    9 +++++++++
> >  1 files changed, 9 insertions(+), 0 deletions(-)
> >
> > diff --git a/hw/9pfs/virtio-9p-handle.c b/hw/9pfs/virtio-9p-handle.c
> > index f96d17a..e403a84 100644
> > --- a/hw/9pfs/virtio-9p-handle.c
> > +++ b/hw/9pfs/virtio-9p-handle.c
> > @@ -39,6 +39,15 @@
> >  #ifndef BTRFS_SUPER_MAGIC
> >  #define BTRFS_SUPER_MAGIC 0x9123683E
> >  #endif
> > +#ifndef AT_REMOVEDIR
> > +#define AT_REMOVEDIR    0x200
> > +#endif
> > +#ifndef AT_EMPTY_PATH
> > +#define AT_EMPTY_PATH   0x1000  /* Allow empty relative pathname */
> > +#endif
> > +#ifndef O_PATH
> > +#define O_PATH    010000000
> > +#endif
> >
> >  struct handle_data {
> >      int mountfd;
> > -- 
> > 1.7.9
> 
> -aneesh
>