[Qemu-block] qemu exit with pending I/O

[Peter Lieven]

Hi,

I just run tests with the new libiscsi branch that allows async reconnects. I 
found that
I cannot quit qemu while qemu is waiting for a reconnect to the storage. E.g.
I start qemu and then shut down the storage. Qemu will then loop forever in
bdrv_flush() and/or bdrv_drain_all().

It would be nice to be able to shut down qemu via normal quit and not have
to kill it in such a case.

And what I asked myself: Why do we call bdrv_drain_all and not bdrv_drain_one 
in bdrv_close?

Peter