/// <summary>Remove an inode from parent's children list.</summary>
/// <remarks>
/// Remove an inode from parent's children list. The caller of this method
/// needs to make sure that parent is in the given snapshot "latest".
/// </remarks>
public virtual bool RemoveChild(INodeDirectory parent, INode child, int latestSnapshotId
)
{
// For a directory that is not a renamed node, if isInLatestSnapshot returns
// false, the directory is not in the latest snapshot, thus we do not need
// to record the removed child in any snapshot.
// For a directory that was moved/renamed, note that if the directory is in
// any of the previous snapshots, we will create a reference node for the
// directory while rename, and isInLatestSnapshot will return true in that
// scenario (if all previous snapshots have been deleted, isInLatestSnapshot
// still returns false). Thus if isInLatestSnapshot returns false, the
// directory node cannot be in any snapshot (not in current tree, nor in
// previous src tree). Thus we do not need to record the removed child in
// any snapshot.
DirectoryWithSnapshotFeature.ChildrenDiff diff = diffs.CheckAndAddLatestSnapshotDiff
(latestSnapshotId, parent).diff;
Diff.UndoInfo <INode> undoInfo = diff.Delete(child);
bool removed = parent.RemoveChild(child);
if (!removed && undoInfo != null)
{
// remove failed, undo
diff.UndoDelete(child, undoInfo);
}
return(removed);
}
/// <summary>clear the created list</summary>
private QuotaCounts DestroyCreatedList(BlockStoragePolicySuite bsps, INodeDirectory
currentINode, INode.BlocksMapUpdateInfo collectedBlocks, IList <INode> removedINodes
)
{
QuotaCounts counts = new QuotaCounts.Builder().Build();
IList <INode> createdList = GetList(Diff.ListType.Created);
foreach (INode c in createdList)
{
c.ComputeQuotaUsage(bsps, counts, true);
c.DestroyAndCollectBlocks(bsps, collectedBlocks, removedINodes);
// c should be contained in the children list, remove it
currentINode.RemoveChild(c);
}
createdList.Clear();
return(counts);
}