private static snapshot getSnapshot(NASAccess nas, string snapshotFullName)
{
snapshot shotToRestore = nas.getSnapshots().SingleOrDefault(
x => x.fullname.ToLower().Contains("/" + snapshotFullName.ToLower() + "@") || x.id == snapshotFullName);
return(shotToRestore);
}
private static iscsiExtent getExtent(NASAccess nas, string snapshotFullName)
{
iscsiExtent extent =
nas.getExtents()
.SingleOrDefault(
x => snapshotFullName.Equals(x.iscsi_target_extent_name, StringComparison.CurrentCultureIgnoreCase));
return(extent);
}
private static snapshotObjects getSnapshotObjectsFromNAS(NASAccess nas, string snapshotFullName)
{
snapshot shotToRestore = getSnapshot(nas, snapshotFullName);
if (shotToRestore == null)
{
nas.invalidateSnapshots();
shotToRestore = getSnapshot(nas, snapshotFullName);
if (shotToRestore == null)
{
throw new Exception("Cannot find snapshot " + snapshotFullName);
}
}
// Now find the extent. We'll need to delete it before we can rollback the snapshot.
iscsiExtent extent = getExtent(nas, snapshotFullName);
if (extent == null)
{
nas.invalidateExtents();
extent = getExtent(nas, snapshotFullName);
if (extent == null)
{
throw new Exception("Cannot find extent " + snapshotFullName);
}
}
// Find the 'target to extent' mapping, since this will need to be deleted before we can delete the extent.
iscsiTargetToExtentMapping tgtToExtent = getTgtToExtent(nas, extent);
if (tgtToExtent == null)
{
nas.invalidateTargetToExtents();
tgtToExtent = getTgtToExtent(nas, extent);
if (tgtToExtent == null)
{
throw new Exception("Cannot find target-to-extent mapping with ID " + extent.id + " for snapshot " + shotToRestore.name);
}
}
// We find the target, as well, just to be sure that our cache is correct.
if (nas.getISCSITargets().Count(x => x.id == tgtToExtent.iscsi_target) == 0)
{
nas.invalidateTargets();
if (nas.getISCSITargets().Count(x => x.id == tgtToExtent.iscsi_target) == 0)
{
throw new Exception("Cannot find target for snapshot " + snapshotFullName);
}
}
return(new snapshotObjects()
{
extent = extent,
shotToRestore = shotToRestore,
tgtToExtent = tgtToExtent
});
}
private static iscsiTargetToExtentMapping getTgtToExtent(NASAccess nas, iscsiExtent extent)
{
iscsiTargetToExtentMapping tgtToExtent = nas.getTargetToExtents().SingleOrDefault(x => x.iscsi_extent == extent.id);
return(tgtToExtent);
}
