Re: [Qemu-devel] [PATCH 2/8] block: bdrv_img_create(): add param_list argument

[Luiz Capitulino <lcapitulino@redhat.com>]

On Thu, 18 Oct 2012 10:33:30 -0300
Luiz Capitulino <lcapitulino@redhat.com> wrote:

> On Thu, 18 Oct 2012 13:57:45 +0200
> Kevin Wolf <kwolf@redhat.com> wrote:
> 
> > Am 17.10.2012 21:35, schrieb Luiz Capitulino:
> > > If set returns a copy of the parameter list used by the block driver
> > > to create the new image.
> > > 
> > > Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
> > > ---
> > >  block.c    | 7 ++++++-
> > >  block.h    | 3 ++-
> > >  blockdev.c | 2 +-
> > >  qemu-img.c | 2 +-
> > >  4 files changed, 10 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/block.c b/block.c
> > > index e95f613..254a5c2 100644
> > > --- a/block.c
> > > +++ b/block.c
> > > @@ -4294,7 +4294,8 @@ bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie)
> > >  
> > >  int bdrv_img_create(const char *filename, const char *fmt,
> > >                      const char *base_filename, const char *base_fmt,
> > > -                    char *options, uint64_t img_size, int flags)
> > > +                    char *options, uint64_t img_size, int flags,
> > > +                    QEMUOptionParameter **param_list)
> > >  {
> > >      QEMUOptionParameter *param = NULL, *create_options = NULL;
> > >      QEMUOptionParameter *backing_fmt, *backing_file, *size;
> > > @@ -4430,6 +4431,10 @@ int bdrv_img_create(const char *filename, const char *fmt,
> > >      }
> > >  
> > >  out:
> > > +    if (param_list && ret == 0) {
> > > +        *param_list = append_option_parameters(NULL, param);
> > > +    }
> > 
> > If you put this above the out: label, the ret == 0 check wouldn't be
> > necessary.
> 
> I'll maintain it it there but will drop the ret check, so that we're
> able to return the options on error too and thus keep the "Formatting"
> message the way it's today.

Actually my idea didn't work. I can think of the following options:

 1. Change it to "Formatted" as you suggested. Cons: will only be
    printed after the image is created

 2. Print "Formatting 'foo', 'qcow2' " before the image is created
    and the options afterwards. Cons: weird?

 3. Don't change this. Cons: will keep spitting stuff to stdout while in
    QMP

I think we should do 2.