/// <summary>Delete a snapshot of a snapshottable directory</summary>
/// <param name="snapshotRoot">The snapshottable directory</param>
/// <param name="snapshotName">The name of the to-be-deleted snapshot</param>
/// <exception cref="System.IO.IOException"/>
internal static INode.BlocksMapUpdateInfo DeleteSnapshot(FSDirectory fsd, SnapshotManager
snapshotManager, string snapshotRoot, string snapshotName, bool logRetryCache)
{
INodesInPath iip = fsd.GetINodesInPath4Write(snapshotRoot);
if (fsd.IsPermissionEnabled())
{
FSPermissionChecker pc = fsd.GetPermissionChecker();
fsd.CheckOwner(pc, iip);
}
INode.BlocksMapUpdateInfo collectedBlocks = new INode.BlocksMapUpdateInfo();
ChunkedArrayList <INode> removedINodes = new ChunkedArrayList <INode>();
fsd.WriteLock();
try
{
snapshotManager.DeleteSnapshot(iip, snapshotName, collectedBlocks, removedINodes);
fsd.RemoveFromInodeMap(removedINodes);
}
finally
{
fsd.WriteUnlock();
}
removedINodes.Clear();
fsd.GetEditLog().LogDeleteSnapshot(snapshotRoot, snapshotName, logRetryCache);
return(collectedBlocks);
}