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[libvirt] [PATCH 0/6] atomic snapshots, rounds 4 and 5

I was originally going to send this as two rounds, one for
the XML additions of adding mirrors, and one for the flag
addition to virDomainSnapshotDelete for mapping to drive-reopen;
but it turned out that testing is easier if I finish the series.

Note that this is minimally tested at the moment; I'm posting it
to get review started, but I plan on hammering it tomorrow, and
possibly coming up with slight alterations for a v2.

This assumes that rounds 1-3 (ending here) have been applied:

This should finish out my RFC here:
but with one major caveat:
Upstream qemu has not yet committed the 'drive-mirror' or 'drive-reopen'
monitor commands, which this series (rounds 4-5) depends on.  There are
still bugs being worked out under the hood on the qemu side, and there
is a slight possibility that fixing those bugs may change the public
interface.  Therefore, part of the review of this series should be to
determine whether we take the risk of applying the patch now, or
waiting for qemu to stabilize a bit further.

I will probably push rounds 1-3 tomorrow, since they have been ACK'd
(well, round 3 is still awaiting review), and since qemu has committed
to the 'transaction' monitor command for qemu 1.1.

For reference, it is likely that RHEL 6.3 will not wait for qemu 1.1,
but will instead provide RHEL-specific monitor commands named
__com.redhat_drive-mirror and __com.redhat_drive-reopen; I have
hopefully structured things well enough that it will be a couple
lines of patching to qemu_monitor_json.c to recognize that alternate
command name.

Eric Blake (6):
  snapshot: allow for creation of mirrored snapshots
  snapshot: add new snapshot delete flags
  snapshot: make it possible to check for mirrored snapshot
  snapshot: expose qemu commands for mirrored storage migration
  snapshot: implement new snapshot delete flags in qemu
  snapshot: enable mirrored snapshots on transient vm

 docs/formatsnapshot.html.in                        |   31 +++
 docs/schemas/domainsnapshot.rng                    |    8 +
 include/libvirt/libvirt.h.in                       |    6 +
 src/conf/domain_conf.c                             |   58 +++++-
 src/conf/domain_conf.h                             |    4 +
 src/libvirt.c                                      |   37 +++-
 src/libvirt_private.syms                           |    2 +
 src/qemu/qemu_capabilities.c                       |    3 +
 src/qemu/qemu_capabilities.h                       |    2 +
 src/qemu/qemu_driver.c                             |  242 +++++++++++++++++++-
 src/qemu/qemu_monitor.c                            |   50 ++++
 src/qemu/qemu_monitor.h                            |   14 ++
 src/qemu/qemu_monitor_json.c                       |   70 ++++++-
 src/qemu/qemu_monitor_json.h                       |   21 ++-
 .../disk_snapshot_mirror.xml                       |   13 +
 .../disk_snapshot_mirror.xml                       |   49 ++++
 tests/domainsnapshotxml2xmltest.c                  |    4 +-
 tools/virsh.c                                      |   13 +
 tools/virsh.pod                                    |   21 ++-
 19 files changed, 622 insertions(+), 26 deletions(-)
 create mode 100644 tests/domainsnapshotxml2xmlin/disk_snapshot_mirror.xml
 create mode 100644 tests/domainsnapshotxml2xmlout/disk_snapshot_mirror.xml


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