1. A computer program product for virtual machine disk image access in a storage system, the computer program product comprising a computer readable storage device having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to: in response to an I/O request, reconstruct, by the processor, a file system request by laying out a disk image, perform type-specific introspection on the disk image comprising determining disk image type, and use a file system specific process for a particular type of file system located in the disk image for analyzing the disk image structure.