diff options
| -rwxr-xr-x | nova/virt/libvirt/imagebackend.py | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/nova/virt/libvirt/imagebackend.py b/nova/virt/libvirt/imagebackend.py index 7e7175865..0a84b22e5 100755 --- a/nova/virt/libvirt/imagebackend.py +++ b/nova/virt/libvirt/imagebackend.py @@ -43,6 +43,10 @@ __imagebackend_opts = [ default=False, help='Create sparse logical volumes (with virtualsize)' ' if this flag is set to True.'), + cfg.IntOpt('libvirt_lvm_snapshot_size', + default='1000', + help='The amount of storage (in megabytes) to allocate for LVM' + ' snapshot copy-on-write blocks.'), ] CONF = cfg.CONF @@ -239,6 +243,11 @@ class Lvm(Image): self.sparse = CONF.libvirt_sparse_logical_volumes + if snapshot_name: + self.snapshot_name = snapshot_name + self.snapshot_path = os.path.join('/dev', self.vg, + self.snapshot_name) + def create_image(self, prepare_template, base, size, *args, **kwargs): @lockutils.synchronized(base, 'nova-', external=True, lock_path=self.lock_path) @@ -273,6 +282,21 @@ class Lvm(Image): with excutils.save_and_reraise_exception(): libvirt_utils.remove_logical_volumes(path) + def snapshot_create(self): + size = CONF.libvirt_lvm_snapshot_size + cmd = ('lvcreate', '-L', size, '-s', '--name', self.snapshot_name, + self.path) + libvirt_utils.execute(*cmd, run_as_root=True, attempts=3) + + def snapshot_extract(self, target, out_format): + images.convert_image(self.snapshot_path, target, out_format, + run_as_root=True) + + def snapshot_delete(self): + # NOTE (rmk): Snapshot volumes are automatically zeroed by LVM + cmd = ('lvremove', '-f', self.snapshot_path) + libvirt_utils.execute(*cmd, run_as_root=True, attempts=3) + class Backend(object): def __init__(self, use_cow): |