Re: [Qemu-devel] [RFC 07/10] QMP: Introduce the blockdev-media-insert command

[Luiz Capitulino <lcapitulino@redhat.com>]

On Mon, 06 Jun 2011 15:40:28 +0200
Markus Armbruster <armbru@redhat.com> wrote:

> Luiz Capitulino <lcapitulino@redhat.com> writes:
> 
> > This command inserts a new media in an already opened tray. It's only
> > available in QMP.
> >
> > Please, check the command's documentation (being introduced in this
> > commit) for a detailed description.
> >
> > Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
> > ---
> >  blockdev.c      |   52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  blockdev.h      |    1 +
> >  qmp-commands.hx |   32 ++++++++++++++++++++++++++++++++
> >  3 files changed, 85 insertions(+), 0 deletions(-)
> >
> > diff --git a/blockdev.c b/blockdev.c
> > index 943905d..14c8312 100644
> > --- a/blockdev.c
> > +++ b/blockdev.c
> > @@ -721,6 +721,58 @@ static int tray_close(const char *device)
> >      return 0;
> >  }
> >  
> > +static int media_insert(const char *device, const char *mediafile,
> > +                        const char *format)
> > +{
> > +    BlockDriver *drv = NULL;
> > +    BlockDriverState *bs;
> > +    int bdrv_flags;
> > +
> > +    bs = bdrv_removable_find(device);
> > +    if (!bs) {
> > +        return -1;
> > +    }
> > +
> > +    if (bdrv_is_locked(bs)) {
> > +        qerror_report(QERR_DEVICE_LOCKED, bdrv_get_device_name(bs));
> > +        return -1;
> > +    }
> 
> Why fail if locked?
> 
> If you managed to pry open the tray, I guess nothing should stop you
> from changing the media in it.

Makes sense.

> 
> > +
> > +    if (bdrv_is_inserted(bs)) {
> > +        /* FIXME: will report undefined error in QMP */
> > +        return -1;
> > +    }
> > +
> > +    if (!bs->tray_open) {
> > +        /* FIXME: will report undefined error in QMP */
> > +        return 1;
> > +    }
> > +
> > +    if (format) {
> > +        drv = bdrv_find_whitelisted_format(format);
> > +        if (!drv) {
> > +            qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
> > +            return -1;
> > +        }
> > +    }
> > +
> > +    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
> > +    bdrv_flags |= bdrv_is_snapshot(bs) ? BDRV_O_SNAPSHOT : 0;
> > +    if (bdrv_open(bs, mediafile, bdrv_flags, drv) < 0) {
> > +        qerror_report(QERR_OPEN_FILE_FAILED, mediafile);
> > +        return -1;
> > +    }
> > +
> > +    return 0;
> > +}
> [...]
>