Am 27.11.2014 um 15:48 hat Max Reitz geschrieben:
> There are some block drivers which are essential to QEMU and may not be
> removed: These are raw, file and qcow2 (as the default non-raw format).
> Make their BlockDriver objects public so they can be directly referenced
> throughout the block layer without needing to call bdrv_find_format()
> and having to deal with an error at runtime, while the real problem
> occured during linking (where raw, file or qcow2 were not linked into
> qemu).
>
> Cc: qemu-sta...@nongnu.org
> Signed-off-by: Max Reitz <mre...@redhat.com>
> ---
> block/qcow2.c | 4 ++--
> block/raw-posix.c | 4 ++--
> block/raw-win32.c | 4 ++--
> block/raw_bsd.c | 4 ++--
> include/block/block_int.h | 8 ++++++++
> 5 files changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/block/qcow2.c b/block/qcow2.c
> index 8b9ffc4..0eeba36 100644
> --- a/block/qcow2.c
> +++ b/block/qcow2.c
> @@ -2847,7 +2847,7 @@ static QemuOptsList qcow2_create_opts = {
> }
> };
>
> -static BlockDriver bdrv_qcow2 = {
> +BlockDriver *bdrv_qcow2 = &(BlockDriver){
As you correctly guessed, I like the looks of this syntax, but it leaves
us with some bdrv_<format> objects being pointers, and most others still
directly being the BlockDriver object.
I think it would be better to define a public BlockDriver here and use
&bdrv_qcow2 where necessary. Perhaps not a blocker, but in case you need
to send a v3.
Kevin
