[Libguestfs] question on nbdkit shutdown behavior

[Richard W.M. Jones]

On Tue, Nov 14, 2017 at 03:56:59PM +0000, Richard W.M. Jones wrote:
> Going back to the original problem, perhaps we could have fixed
> it instead by acquiring a lock around all plugin callbacks, and
> ensuring that plugin_cleanup also acquires the same lock.  The
> lock would normally be uncontended so it shouldn't cause any
> performance issues.  That would be a fairly simple revert of
> 63f0eb088 + alternate fix.

No actually that would serialize everything.  Some sort of mutex
primitive, I think a shared/exclusive lock with the exclusive lock
being taken in plugin_cleanup.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v