scale layer to current canvas size photoshop

I've been googling, and reading, but I have not been able to find an action, or method to select a layer, and have it scale to the canvas size? This seems to be something that should be built in?

Anyone know of a script or action I can use?

Sometimes it needs to scale up or down.

And I don't need to keep the proportions. Just scale to fill.

Thanks for your help

Maxi

PS: I know in Russell Brown's Paper Texture extension, the loaded layers are scaled to fit the canvas.