Re: [PATCH v2 06/19] hw/9pfs: Add missing definitions for Windows

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Wednesday, November 16, 2022 10:01:39 AM CET Shi, Guohuai wrote:
[...]
> > > diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h index
> > > 4997677460..7d9a736b66 100644
> > > --- a/fsdev/file-op-9p.h
> > > +++ b/fsdev/file-op-9p.h
> > > @@ -27,6 +27,39 @@
> > >  # include <sys/mount.h>
> > >  #endif
> > >
> > > +#ifdef CONFIG_WIN32
> > > +
> > > +/* POSIX structure not defined in Windows */
> > > +
> > > +typedef uint32_t uid_t;
> > > +typedef uint32_t gid_t;
> > > +
> > > +/* from http://man7.org/linux/man-pages/man2/statfs.2.html */ typedef
> > > +uint32_t __fsword_t; typedef uint32_t fsblkcnt_t; typedef uint32_t
> > > +fsfilcnt_t;
> > > +
> > > +/* from linux/include/uapi/asm-generic/posix_types.h */ typedef
> > > +struct {
> > > +    long __val[2];
> > > +} fsid_t;
> > > +
> > > +struct statfs {
> > > +    __fsword_t f_type;
> > > +    __fsword_t f_bsize;
> > > +    fsblkcnt_t f_blocks;
> > > +    fsblkcnt_t f_bfree;
> > > +    fsblkcnt_t f_bavail;
> > > +    fsfilcnt_t f_files;
> > > +    fsfilcnt_t f_ffree;
> > > +    fsid_t f_fsid;
> > > +    __fsword_t f_namelen;
> > > +    __fsword_t f_frsize;
> > > +    __fsword_t f_flags;
> > > +};
> > > +
> > 
> > Does it make sense to define all of these, even though not being used?
> 
> Windows does not have this definition, so use Linux definition can make less impact to 9pfs code.
> If not, need to add many macro "#ifdef CONFIG_WIN32" in other places to disable the unsupported code.

My bad, I thought most of these were not referenced in code at all, but I just
realized they are indeed. Only exception is probably `f_flags`, but I haven't
checked yet whether you are using that for something new in your patches.

The previous patches LGTM BTW. I still have to look at all following patches
though. So better wait some more days before posting a v3.

Best regards,
Christian Schoenebeck