[$] The hard life of a virtual-filesystem developer

Filesystem development is not an easy task; the performance demands aretypically high, and the consequences for mistakes usually involve lost dataand irate users. The implementation of a virtual (or "pseudo") filesystem- a filesystem implemented within the kernel and lacking a normal backingstore - can also be challenging, but for different reasons. A series ofconversations around the eventfs virtual filesystem has turned a spotlighton the difficulty of creating a virtual filesystem for Linux.