Re: [Qemu-devel] [PATCH v7 08/10] block: Add checks of blocker in block operations

[Fam Zheng]

On 2013年12月12日 21:56, Markus Armbruster wrote:
> Fam Zheng <address@hidden> writes:
>
> > Before operate on a BlockDriverState, respective types are checked
> > against bs->op_blockers and it will error out if there's a blocker.
> >
> > Signed-off-by: Fam Zheng <address@hidden>
>
> So this patch adds protection against "two of the same kind
> simultaneously".  How could we check it's complete?
>
> Have we pondered the more general problem of which "operations"
> (whatever that is) exclude each other?

Good point. For what we want now, I think these extra checks are not 
required. I think these could be added in a separate series if any. 
Planning to drop it for next revision but the discussion is still open.

Thanks,
Fam