1. A system adapted to provide a file system layout of a storage system, the system comprising: an aggregate configured with one or more groups of disks of the storage system, the aggregate having a physical volume block number (pvbn) space defining a global storage space of blocks provided by the disks, the global storage space substantially simplifying storage management of free blocks through use of a single pool of disks; and one or more virtual volumes (vvols) contained within the aggregate, each vvol containing one or more files organized as buffer trees, the buffer trees utilizing pvbns as block pointers to facilitate efficient read performance on read paths of the files contained in the vvol.