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

[Luiz Capitulino <lcapitulino@redhat.com>]

On Fri, 19 Oct 2012 11:13:39 +0200
Kevin Wolf <kwolf@redhat.com> wrote:

> Am 18.10.2012 19:18, schrieb Luiz Capitulino:
> > 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.
> 
> How about leaving the code printing the message where it is, but putting
> an if (!cur_mon) around it?

So ugly that I prefer to drop this patch from my series and revisit this
later :)