Re: [Qemu-devel] [PATCH 01/12] block: qcow2 driver may not be found

[Kevin Wolf <kwolf@redhat.com>]

Am 26.11.2014 um 16:20 hat Max Reitz geschrieben:
> On 2014-11-26 at 16:19, Eric Blake wrote:
> >On 11/26/2014 02:13 AM, Max Reitz wrote:
> >>On 2014-11-26 at 08:23, Markus Armbruster wrote:
> >>>Max Reitz <mreitz@redhat.com> writes:
> >>>
> >>>>Albeit absolutely impossible right now, bdrv_find_format("qcow2") may
> >>>>fail. bdrv_append_temp_snapshot() should heed that case.
> >>>Impossible because we always compile in bdrv_qcow2.
> >>>>+++ b/block.c
> >>>>@@ -1320,6 +1320,12 @@ int bdrv_append_temp_snapshot(BlockDriverState
> >>>>*bs, int flags, Error **errp)
> >>>>       }
> >>>>         bdrv_qcow2 = bdrv_find_format("qcow2");
> >>>>+    if (!bdrv_qcow2) {
> >Would it be shorter to 'assert(bdrv_qcow2);' to still silence Coverity?
> 
> Sounds like a good compromise. Will do.

I think it's better to have either proper error handling for the case
that someone compiles it out, like implemented by this patch, or to
reference the symbol so that compiling it out already breaks the build.
The assert() would potentially be a crash of a running VM, which is not
as nice.

Kevin