Squid external overview

Squid filesystems
Until recently, the only avaliable FSes were based upon the UNIX filesystem

The on-disk arrangement is a two-level hash based upon the file number:

/* Assume L1 and L2 are both 256 */
000000 -> cachedir/00/00/000000
001000 -> cachedir/00/10/001000

Changes to squid have allowed non-UNIX filesystems to be implemented efficiently, but non have appeared yet