[libvirt] [PATCH 0/4] Preparation for external live snapshot
I've determined that it is possible to mix migration to file
with disk snapshots on existing qemu 1.1 in such a way to
take a live system checkpoint snapshot of a system without
the downtime of either 'virsh snapshot-create' or 'virsh save';
without the loss in disk state of 'virsh save'; and without
the fsck penalties of 'virsh snapshot-create --disk-only';
basically by combining the best of those three approaches.
I'm also quite tired of 'virsh snapshot-create --disk-only'
failing for an offline domain, and have upcoming patches to
drive qemu-img to do that for an offline image.
Unfortunately, qemu 1.2 missed out on adding the 'drive-mirror'
or 'block-commit' commands, so I still can't do quite everything
I want with snapshots (in particular, I can't preserve the
original filename; although you can do a snapshot/blockpull/snapshot
to get back to the original filename with twice the work). But
I think this series still leaves room for future enhancements
as future qemu provides the means.
Although I'm still in the middle of polishing the src/qemu patches,
I'd at least like to post this series of prep-work to document
how I plan to expose it all, and to make sure my design
decisions are on track. The first three can be applied now,
the fourth should probably not be applied until I actually have
later patches using the new XML, hopefully still in time for 0.10.0.
Eric Blake (4):
snapshot: make virDomainSnapshotObjList opaque
snapshot: split snapshot conf code into own file
snapshot: rename an enum
snapshot: new XML for external system checkpoint
docs/formatsnapshot.html.in | 11 +
docs/schemas/domainsnapshot.rng | 23 +
po/POTFILES.in | 1 +
src/Makefile.am | 3 +-
src/conf/domain_conf.c | 933 +-----------------
src/conf/domain_conf.h | 143 +--
src/conf/snapshot_conf.c | 1021 ++++++++++++++++++++
src/conf/snapshot_conf.h | 160 +++
src/esx/esx_driver.c | 1 +
src/libvirt_private.syms | 5 +-
src/qemu/qemu_command.c | 1 +
src/qemu/qemu_domain.c | 7 +-
src/qemu/qemu_domain.h | 3 +-
src/qemu/qemu_driver.c | 69 +-
src/qemu/qemu_migration.c | 2 +-
src/vbox/vbox_tmpl.c | 1 +
tests/domainsnapshotxml2xmlin/external_vm.xml | 10 +
tests/domainsnapshotxml2xmlin/noparent.xml | 9 +
tests/domainsnapshotxml2xmlout/all_parameters.xml | 1 +
tests/domainsnapshotxml2xmlout/disk_snapshot.xml | 1 +
tests/domainsnapshotxml2xmlout/external_vm.xml | 43 +
tests/domainsnapshotxml2xmlout/full_domain.xml | 1 +
tests/domainsnapshotxml2xmlout/metadata.xml | 1 +
tests/domainsnapshotxml2xmlout/noparent.xml | 1 +
.../noparent_nodescription.xml | 1 +
.../noparent_nodescription_noactive.xml | 1 +
tests/domainsnapshotxml2xmltest.c | 1 +
27 files changed, 1365 insertions(+), 1089 deletions(-)
create mode 100644 src/conf/snapshot_conf.c
create mode 100644 src/conf/snapshot_conf.h
create mode 100644 tests/domainsnapshotxml2xmlin/external_vm.xml
create mode 100644 tests/domainsnapshotxml2xmlin/noparent.xml
create mode 100644 tests/domainsnapshotxml2xmlout/external_vm.xml
--
1.7.11.2