/// <summary>Remove the given reference and then return the reference count.</summary>
/// <remarks>
/// Remove the given reference and then return the reference count.
/// If the referred inode is not a WithCount, return -1;
/// </remarks>
private static int RemoveReference(Org.Apache.Hadoop.Hdfs.Server.Namenode.INodeReference
@ref)
{
INode referred = @ref.GetReferredINode();
if (!(referred is INodeReference.WithCount))
{
return(-1);
}
INodeReference.WithCount wc = (INodeReference.WithCount)referred;
wc.RemoveReference(@ref);
return(wc.GetReferenceCount());
}
/// <summary>
/// When destroying a reference node (WithName or DstReference), we call this
/// method to identify the snapshot which is the latest snapshot before the
/// reference node's creation.
/// </summary>
internal static int GetPriorSnapshot(Org.Apache.Hadoop.Hdfs.Server.Namenode.INodeReference
@ref)
{
INodeReference.WithCount wc = (INodeReference.WithCount)@ref.GetReferredINode();
INodeReference.WithName wn = null;
if (@ref is INodeReference.DstReference)
{
wn = wc.GetLastWithName();
}
else
{
if (@ref is INodeReference.WithName)
{
wn = wc.GetPriorWithName((INodeReference.WithName)@ref);
}
}
if (wn != null)
{
INode referred = wc.GetReferredINode();
if (referred.IsFile() && referred.AsFile().IsWithSnapshot())
{
return(referred.AsFile().GetDiffs().GetPrior(wn.lastSnapshotId));
}
else
{
if (referred.IsDirectory())
{
DirectoryWithSnapshotFeature sf = referred.AsDirectory().GetDirectoryWithSnapshotFeature
();
if (sf != null)
{
return(sf.GetDiffs().GetPrior(wn.lastSnapshotId));
}
}
}
}
return(Org.Apache.Hadoop.Hdfs.Server.Namenode.Snapshot.Snapshot.NoSnapshotId);
}