1config OVERLAY_FS 2 tristate "Overlay filesystem support" 3 help 4 An overlay filesystem combines two filesystems - an 'upper' filesystem 5 and a 'lower' filesystem. When a name exists in both filesystems, the 6 object in the 'upper' filesystem is visible while the object in the 7 'lower' filesystem is either hidden or, in the case of directories, 8 merged with the 'upper' object. 9 10 For more information see Documentation/filesystems/overlayfs.txt 11