Re: [Qemu-devel] [PATCH] Modify qemu_opt_rename to realize renaming all items in opts

[Jun Li <junmuzi@gmail.com>]

On Tue, 09/23 10:47, Eric Blake wrote:
> On 09/23/2014 07:13 AM, Jun Li wrote:
> > Add realization of rename all items in opts for qemu_opt_rename.
> > e.g:
> > When add bps twice in command line, need to rename all bps to
> > throttling.bps-total.
> > 
> > Signed-off-by: Jun Li <junmuzi@gmail.com>
> > ---
> > This patch solved following bug:
> > Bug 1145586 - qemu-kvm will give strange hint when add bps twice for a drive
> > ref:https://bugzilla.redhat.com/show_bug.cgi?id=1145586
> 
> Including that bug link in the commit message might be nice for someone
> visiting this patch a year from now.

ok, got it.

> 
> > ---
> >  blockdev.c | 13 +++++++++----
> >  1 file changed, 9 insertions(+), 4 deletions(-)
> > 
> > diff --git a/blockdev.c b/blockdev.c
> > index b361fbb..7c39a06 100644
> > --- a/blockdev.c
> > +++ b/blockdev.c
> > @@ -536,10 +536,15 @@ static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to)
> >  {
> >      const char *value;
> >  
> > -    value = qemu_opt_get(opts, from);
> > -    if (value) {
> > -        qemu_opt_set(opts, to, value);
> > -        qemu_opt_unset(opts, from);
> > +    /* rename all items */
> > +    while (1) {
> > +        value = qemu_opt_get(opts, from);
> 
> Can't this just be written as:
> 
> while ((value = qemu_opt_get(opts, from))) {
> 
> > +        if (value) {
> > +            qemu_opt_set(opts, to, value);
> > +            qemu_opt_unset(opts, from);
> > +        } else {
> > +            break;
> > +        }
> 
> and lose the if/else and break?  But that's style, not functional, so:
> 
> Reviewed-by: Eric Blake <eblake@redhat.com>

Thanks. I will submit a new version.

Best Regards,
Jun Li