Hash wrapper

This is a simple wrapper for Drupal 7 implementing a 'hash://' schema to help with storing a couple (ten) million files. Instead of storing CHANGELOG.txt it will store the file under its MD5'd name, hashed into two levels of directories: a0/49/a0493e27f48b50e18312b9f4508fc29d.txt

Select 'Hashed files' under Upload destination when adding a File field to use it.