Re: [Qemu-devel] [PATCH] blockdev: fix cdrom read_only flag

[Fam Zheng <famz@redhat.com>]

On Tue, 10/15 11:13, Kevin Wolf wrote:
> Am 15.10.2013 um 03:27 hat Fam Zheng geschrieben:
> > Since 0ebd24e0, cdrom doesn't have read-only on by default, which will
> > error out when using an read only image. Fix it by setting the default
> > value when parsing opts.
> > 
> > Reported-by: Edivaldo de Araujo Pereira <edivaldoapereira@yahoo.com.br>
> > Signed-off-by: Fam Zheng <famz@redhat.com>
> > ---
> >  blockdev.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/blockdev.c b/blockdev.c
> > index 4f76e28..7f5ef4a 100644
> > --- a/blockdev.c
> > +++ b/blockdev.c
> > @@ -625,7 +625,8 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
> >      int cyls, heads, secs, translation;
> >      int max_devs, bus_id, unit_id, index;
> >      const char *devaddr;
> > -    bool read_only, copy_on_read;
> > +    bool read_only = false;
> > +    bool copy_on_read;
> >      Error *local_err = NULL;
> >  
> >      /* Change legacy command line options into QMP ones */
> > @@ -701,7 +702,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
> >              media = MEDIA_DISK;
> >          } else if (!strcmp(value, "cdrom")) {
> >              media = MEDIA_CDROM;
> > -            qdict_put(bs_opts, "read-only", qstring_from_str("on"));
> > +            read_only = true;
> >          } else {
> >              error_report("'%s' invalid media", value);
> >              goto fail;
> > @@ -709,7 +710,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
> >      }
> >  
> >      /* copy-on-read is disabled with a warning for read-only devices */
> > -    read_only = qemu_opt_get_bool(legacy_opts, "read-only", false);
> > +    read_only = qemu_opt_get_bool(legacy_opts, "read-only", read_only);
> 
> I believe we must move this line to above the media=... handling for
> compatibility with old versions. Or actually, using |= instead of = may
> be enough.
> 
> The reason is this command line:
> 
>     -drive file=test.iso,media=cdrom,readonly=off
> 
> Which, "obviously", means that a read-only CD-ROM device should be
> created.
> 

Oh, I didn't notice readony=off means a read-only CD-ROM before...

Fam