Re: [PATCH] 9pfs: fix missing sys/mount.h include

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Friday, October 28, 2022 1:42:34 PM CEST Thomas Huth wrote:
> On 28/10/2022 13.21, Christian Schoenebeck wrote:
> > Fixes the following build error:
> > 
> >    fsdev/file-op-9p.h:156:56: error: declaration of 'struct statfs' will
> >    not be visible outside of this function [-Werror,-Wvisibility]
> >      int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
> >                                                         ^
> > 
> > As Windows neither has statfs, nor sys/mount.h, don't include it there.
> > 
> > Fixes: 684f91203439 ("tests/9p: split virtio-9p-test.c ...")
> > Link: https://lore.kernel.org/all/2690108.PsDodiG1Zx@silver/
> > Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
> > ---
> >   fsdev/file-op-9p.h | 2 ++
> >   1 file changed, 2 insertions(+)
> > 
> > diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
> > index 4997677460..700f1857b4 100644
> > --- a/fsdev/file-op-9p.h
> > +++ b/fsdev/file-op-9p.h
> > @@ -24,6 +24,8 @@
> >   #endif
> >   #ifdef CONFIG_DARWIN
> >   # include <sys/param.h>
> > +#endif
> > +#ifndef CONFIG_WIN32
> >   # include <sys/mount.h>
> >   #endif
> 
> Do you feel confident that this will also work on other exotic systems? 
> (e.g. does it work with "make vm-build-haiku.x86_64" ?)
> Otherwise it might be better to add a meson.build test for this header instead.

9pfs only supports Linux and macOS ATM, and Windows being WIP. From
meson.buid:

have_virtfs = get_option('virtfs') \
    .require(targetos == 'linux' or targetos == 'darwin',
             error_message: 'virtio-9p (virtfs) requires Linux or macOS') \
    .require(targetos == 'linux' or cc.has_function('pthread_fchdir_np'),
             error_message: 'virtio-9p (virtfs) on macOS requires the presence of pthread_fchdir_np') \
    .require(targetos == 'darwin' or (libattr.found() and libcap_ng.found()),
             error_message: 'virtio-9p (virtfs) on Linux requires libcap-ng-devel and libattr-devel') \
    .disable_auto_if(not have_tools and not have_system) \
    .allowed()

And Bin Meng just sent a related patch to fix building 9pfs tests
unconditionally:

https://lore.kernel.org/all/20221028045736.679903-9-bin.meng@windriver.com/

Best regards,
Christian Schoenebeck