Is it possible to reset a jQuery deferred object state?

Is it possible to reset a resolved jQuery object to an 'unresolved' state and kick off it's initialization and callbacks all over again?

The specific thing I'm doing is that I have a jQuery deferred wrapper over the local file system api. From there I build up higher level deferreds for the things I care about:

var getFs = defFs.requestQuota(PERSISTENT, 1024*1024)
              .pipe (bytes) -> defFs.requestFs(PERSISTENT, bytes)

var getCacheContents = getFs.pipe (fileSystem) -> 
      defFs.getDirectory('Cache', fileSystem.root).pipe (dir) ->
          defFs.readEntries(dir)

Now most of the time, when I call getCacheContents I don't mind the memo-ized values being returned, in fact I prefer it. But, on the occasion when I want to write to the cache I really would like the ability to reset that pipe and have it re-select and rescan the cache next time its accessed.

I could cobble something together from $.Callbacks but a deferred-based solution would really be ideal.