linux-kernel - Re: [PATCH 2/3] qemu: Implement virtio-pstore device

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Date:   Fri, 26 Aug 2016 08:27:23 -0400
From:   "Daniel P. Berrange" <berrange@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     virtio-dev@...ts.oasis-open.org, kvm@...r.kernel.org,
        qemu-devel@...gnu.org, virtualization@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Anthony Liguori <aliguori@...zon.com>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH 2/3] qemu: Implement virtio-pstore device

On Fri, Aug 26, 2016 at 01:48:40PM +0900, Namhyung Kim wrote:
> Hi Daniel,
> 
> On Wed, Aug 24, 2016 at 06:00:51PM -0400, Daniel P. Berrange wrote:

> > > +    fd = open(filename, O_RDONLY);
> > > +    if (fd < 0) {
> > > +        error_report("cannot open %s", filename);
> > > +        goto out;
> > > +    }
> > > +
> > > +    if (fstat(fd, &stbuf) < 0) {
> > > +        goto out;
> > > +    }
> > > +
> > > +    rarg->vps            = s;
> > > +    rarg->elem           = elem;
> > > +    rarg->info.id        = cpu_to_le64(rarg->info.id);
> > > +    rarg->info.type      = cpu_to_le16(rarg->info.type);
> > > +    rarg->info.flags     = cpu_to_le32(rarg->info.flags);
> > > +    rarg->info.time_sec  = cpu_to_le64(stbuf.st_ctim.tv_sec);
> > > +    rarg->info.time_nsec = cpu_to_le32(stbuf.st_ctim.tv_nsec);
> > > +
> > > +    rarg->ioc = qio_channel_new_fd(fd, &err);
> > 
> > You should just use qio_channel_open_path() and avoid the earlier
> > call to open()
> 
> I did it because to call fstat() using the fd and wanted to keep the
> generic ioc pointer.

I'd suggest just using a cast inline, eg

  fstat(QIO_CHANNEL_FILE(ioc)->fd, &stbuf)


Regards,
Daniel
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