Re: [Qemu-devel] [PATCH v2] blockdev: fix cdrom read_only flag

[Fam Zheng <famz@redhat.com>]

Cc'ing qemu-stable.

Fam

On 10/15/2013 05:45 PM, Fam Zheng wrote:
> 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>
>
> ---
> v2: fix backward compatibility by force read-only with cdrom. (Kevin)
>
> 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..b260477 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", false);
>       copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
>   
>       if (read_only && copy_on_read) {