Squid internals

The Storage Manager (src/store*.c)
SquidFS API - handling disk IO
The following calls exist to manipulate on-disk information
sio = storeCreate(e, file_callback, close_callback, callback_data)
/* Create an object for writing */
/* file_callback is called when the swap_filen is decided */
sio = storeOpen(e, file_callback, close_callback, callback_data)
/* Open an object for reading */
/* file_callback is called if the swap_filen changes */
storeClose(sio)
/* Close an object */
storeRead(sio, buf, size, offset, callback, callback_data)
/* Read part of an object */
storeWrite(sio, buf, size, offset, freefunc)
/* write part of an object, free buf with 'freefunc' */
storeUnlink(e)
/* Delete the given object */
offset = storeOffset(sio)
/* Get the _on-disk_ offset of the object */