Re: [Qemu-devel] [PATCH v3 2/6] block: Take advantage of QemuOpt default integers

[Kevin Wolf <kwolf@redhat.com>]

Am 10.01.2019 um 20:18 hat Eric Blake geschrieben:
> Instead of defining an integer to a default string value (where we
> have to be careful how we spelled the integer because of the use of
> stringify), populate a default integer value instead.
> 
> Drop a useless stringify(0); a missing default is just as easy to
> interpret as 0 as an explicit string 0.
> 
> Signed-off-by: Eric Blake <eblake@redhat.com>

> diff --git a/block/vhdx.c b/block/vhdx.c
> index b785aef4b7b..54bf6805fc6 100644
> --- a/block/vhdx.c
> +++ b/block/vhdx.c
> @@ -2085,13 +2085,12 @@ static QemuOptsList vhdx_create_opts = {
>         {
>             .name = VHDX_BLOCK_OPT_LOG_SIZE,
>             .type = QEMU_OPT_SIZE,
> -           .def_value_str = stringify(DEFAULT_LOG_SIZE),
> +           .def_value_int = DEFAULT_LOG_SIZE,
>             .help = "Log size; min 1MB."
>         },
>         {
>             .name = VHDX_BLOCK_OPT_BLOCK_SIZE,
>             .type = QEMU_OPT_SIZE,
> -           .def_value_str = stringify(0),
>             .help = "Block Size; min 1MB, max 256MB. " \
>                     "0 means auto-calculate based on image size."
>         },

Before the patch:
$ ./qemu-img create -f vhdx /tmp/test.vhdx 64M
Formatting '/tmp/test.vhdx', fmt=vhdx size=67108864 log_size=1048576 block_size=0

After the patch:
$ ./qemu-img create -f vhdx /tmp/test.vhdx 64M
Formatting '/tmp/test.vhdx', fmt=vhdx size=67108864 log_size=1048576

Intentional?

Kevin