Squid internals

The Storage Manager (src/store*.c)
SquidFS API - storedir state
Each storedir is responsible for
checking whether the storedir can store the object
SD->checkobj()
the placement and retrieval of the object in its storedir
squidfs calls from last slide
creation of a clean storedir (squid -z)
SD->newfs()
checking the integrity of the storedir (squid -S)
SD->dblcheck()
returning statistics of storedir use
SD->statfs()
implementing a removal policy (internal or one of the repl objects)
SD->repl
handling object replacement
SD->maintainfs()
handling any pending IO callbacks (async disk IO)
SD->callback()
syncing pending operations to disk
SD->sync()
flushing to/restoring from disk the storedir state
SD->log. ..