/// <summary>Replace the given child with a new child.</summary>
/// <remarks>
/// Replace the given child with a new child. Note that we no longer need to
/// replace an normal INodeDirectory or INodeFile into an
/// INodeDirectoryWithSnapshot or INodeFileUnderConstruction. The only cases
/// for child replacement is for reference nodes.
/// </remarks>
public virtual void ReplaceChild(INode oldChild, INode newChild, INodeMap inodeMap
)
{
Preconditions.CheckNotNull(children);
int i = SearchChildren(newChild.GetLocalNameBytes());
Preconditions.CheckState(i >= 0);
Preconditions.CheckState(oldChild == children[i] || oldChild == children[i].AsReference
().GetReferredINode().AsReference().GetReferredINode());
oldChild = children[i];
if (oldChild.IsReference() && newChild.IsReference())
{
// both are reference nodes, e.g., DstReference -> WithName
INodeReference.WithCount withCount = (INodeReference.WithCount)oldChild.AsReference
().GetReferredINode();
withCount.RemoveReference(oldChild.AsReference());
}
children.Set(i, newChild);
// replace the instance in the created list of the diff list
DirectoryWithSnapshotFeature sf = this.GetDirectoryWithSnapshotFeature();
if (sf != null)
{
sf.GetDiffs().ReplaceChild(Diff.ListType.Created, oldChild, newChild);
}
// update the inodeMap
if (inodeMap != null)
{
inodeMap.Put(newChild);
}
}
/// <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());
}
/// <exception cref="Org.Apache.Hadoop.Hdfs.Protocol.QuotaExceededException"/>
internal virtual void RestoreSource()
{
// Rename failed - restore src
INode oldSrcChild = srcChild;
// put it back
if (withCount == null)
{
srcChild.SetLocalName(srcChildName);
}
else
{
if (!srcChildIsReference)
{
// src must be in snapshot
// the withCount node will no longer be used thus no need to update
// its reference number here
srcChild = withCount.GetReferredINode();
srcChild.SetLocalName(srcChildName);
}
else
{
withCount.RemoveReference(oldSrcChild.AsReference());
srcChild = new INodeReference.DstReference(srcParent, withCount, srcRefDstSnapshot
);
withCount.GetReferredINode().SetLocalName(srcChildName);
}
}
if (isSrcInSnapshot)
{
srcParent.UndoRename4ScrParent(oldSrcChild.AsReference(), srcChild);
}
else
{
// srcParent is not an INodeDirectoryWithSnapshot, we only need to add
// the srcChild back
fsd.AddLastINodeNoQuotaCheck(srcParentIIP, srcChild);
}
}
