@ThreadSafe
@DefaultAnnotation(value=edu.umd.cs.findbugs.annotations.NonNull.class)
final class FsNotWriteLockedException
extends FsException

Indicates that a controller is not write locked and the lock cannot get acquired by the current thread for some reason. Note that the write lock is required for any change to the state of a controller which uses a FsConcurrentModel - not just to the state of the file system.