Re: [Qemu-devel] [PATCH V3 11/11] hmp: show snapshot on single block device

[Luiz Capitulino <lcapitulino@redhat.com>]

On Mon, 14 Jan 2013 12:15:37 +0100
Pavel Hrdina <phrdina@redhat.com> wrote:

> On Mon, 2013-01-14 at 15:09 +0800, Wenchao Xia wrote:
> >   This patch use block layer API to qmp snapshot info on a block
> > device, then use the same code dumping vm snapshot info, to print
> > in monitor.
> > 
> > Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
> > ---
> > Note:
> >   This patch need previous hmp extention patch which enable
> > info sub command take qdict * as paramter.
> 
> > diff --git a/savevm.c b/savevm.c
> > index cabdcb6..cd474e9 100644
> > --- a/savevm.c
> > +++ b/savevm.c
> > @@ -2354,9 +2354,50 @@ static void do_info_snapshots_vm(Monitor *mon)
> >      return;
> >  }
> >  
> > +static void do_info_snapshots_blk(Monitor *mon, const char *device)
> > +{
> > +    Error *err = NULL;
> > +    SnapshotInfoList *list;
> > +    BlockDriverState *bs;
> > +
> > +    /* find the target bs */
> > +    bs = bdrv_find(device);
> > +    if (!bs) {
> > +        monitor_printf(mon, "Device '%s' not found.\n", device);
> > +        return ;
> > +    }
> > +
> > +    if (!bdrv_can_snapshot(bs)) {
> > +        monitor_printf(mon, "Device '%s' can't have snapshot.\n", device);
> > +        return ;
> > +    }
> > +
> > +    list = bdrv_query_snapshot_infolist(bs, NULL, NULL, &err);
> > +    if (error_is_set(&err)) {
> > +        hmp_handle_error(mon, &err);
> > +        return;
> > +    }
> > +
> > +    if (list == NULL) {
> > +        monitor_printf(mon, "There is no snapshot available.\n");
> > +        return;
> > +    }
> > +
> > +    monitor_printf(mon, "Device '%s':\n", device);
> > +    monitor_dump_snapshotinfolist(mon, list);
> > +    qapi_free_SnapshotInfoList(list);
> > +    return;
> > +}
> > +
> >  void do_info_snapshots(Monitor *mon, const QDict *qdict)
> >  {
> > -    do_info_snapshots_vm(mon);
> > +    const char *device = qdict_get_try_str(qdict, "device");
> > +    if (!device) {
> > +        do_info_snapshots_vm(mon);
> > +    } else {
> > +        do_info_snapshots_blk(mon, device);
> > +    }
> > +    return;
> >  }
> >  
> 
> I think that you should move these functions into hmp.c file. This also
> applies to previous patch and according to this changes you don't have
> to export hmp_handle_error() function which should be used only in hmp.c

Exactly, I was going to say the same thing. Also note that you'll need
better names for do_info_snapshots_vm() and do_info_snapshots_blk() if
you make them public (or you could move them to hmp.c as well).