Final re-send for wording.

The move to blk_flush altered the behavior of migration and flushing
nodes that are not reachable via the guest, but are still reachable
via QEMU and may or may not need to be flushed.

This is likely the simplest solution for now until we nail down our
policy a bit more.

This is intended for 2.6.2 and/or 2.7.1, to fix problems with libvirt
et al being unable to migrate QEMU when the CDROM tray is open.

 Commit message update.

 Trying to take a hint from Kevin, reinstating bdrv_flush_all.
 If it's not what we want, we can try moving back to v2,
 acknowledging that a nicer solution in the future:
 (A) Can skip flushing on devices that just don't need it, and
 (B) Optionally institutes some sort of flush-on-eject policy.


For convenience, this branch is available at: branch atapi-tray-migfix

This version is tagged atapi-tray-migfix-v4:

John Snow (2):
  block: reintroduce bdrv_flush_all
  qemu: use bdrv_flush_all for vm_stop et al

 block/io.c            | 25 +++++++++++++++++++++++++
 cpus.c                |  4 ++--
 include/block/block.h |  1 +
 3 files changed, 28 insertions(+), 2 deletions(-)


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