Re: [Qemu-devel] [PATCH v8] block/raw-posix.c: Fix raw_getlength() on Mac OS X for CD

[Stefan Hajnoczi]

On Mon, Jan 19, 2015 at 10:12 PM, Programmingkid
<programmingk...@gmail.com> wrote:
> Subject was:
> Re: [PATCH v7] block/raw-posix.c: Fixes raw_getlength()
> on Mac OS X so that it reports the correct length of a real CD
>
> This patch allows Mac OS X to use a real CDROM disc in QEMU.
> Testing this patch will require using QEMU v2.2.0 because the
>  current git version has a bug in it that prevents /dev/cdrom from
>  being used.  "make check" did pass and my Debian boot disc did work.
>
> Signed-off-by: John Arbuckle <programmingk...@gmail.com>
>
> ---
> Fixed code indentation to be inline with removed
> size = LLONG_MAX.
>
>  block/raw-posix.c |   15 ++++++++++++++-
>  1 files changed, 14 insertions(+), 1 deletions(-)
>
> diff --git a/block/raw-posix.c b/block/raw-posix.c
> index e51293a..fa431b2 100644
> --- a/block/raw-posix.c
> +++ b/block/raw-posix.c
> @@ -1312,7 +1312,20 @@ again:
>          if (size == 0)
>  #endif
>  #if defined(__APPLE__) && defined(__MACH__)
> -        size = LLONG_MAX;
> +        {
> +            uint64_t sectors = 0;
> +            uint32_t sector_size = 0;
> +
> +            if (ioctl(fd, DKIOCGETBLOCKCOUNT, &sectors) == 0
> +               && ioctl(fd, DKIOCGETBLOCKSIZE, &sector_size) == 0) {
> +                size = sectors * sector_size;
> +            } else {
> +                size = lseek(fd, 0LL, SEEK_END);
> +                if (size < 0) {
> +                    return -errno;
> +                }
> +            }
> +        }
>  #else
>          size = lseek(fd, 0LL, SEEK_END);
>          if (size < 0) {

Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>