How to copy adjustment mask layers

[voitek]

How can I copy an adjustment mask layer? Dragging with ALT copies the whole adjustment, not only the mask.

[NotMyFault]

Photo:

1. use channels panel
2. Click on adjustment layer alpha, create mask 

Designer:

1. selection from layer
2. create mask from selction

[smadell]

Or, if your target layer is an adjustment layer, live filter layer or Fill layer…

1) Command-Click (or Cntrl-Click on Windows) on the adjustment layer with the mask
2) With the desired target layer selected, invert the selection (Cmd-Shift-I, or "Invert Pixel Selection" from the Select menu).
3) Assuming that your background color is black, choose "Fill with Secondary Color" from the Edit menu.