It would be interesting if a "file type" existed to provide these more complex operations, and if those could also be bound to a daemon running with provided parameters.
This would allow for a filesystem name linked to a database API / any other daemon or program.
I also love the TRAP (related to above) and both directory operations. Quotas can sort of fulfill the space limits thing (but I've never bothered using such a system and haven't been on a system that did). Append Only directories are a far harder beast to slay, but would very nicely fulfill many queue submission systems.
This would allow for a filesystem name linked to a database API / any other daemon or program.
I also love the TRAP (related to above) and both directory operations. Quotas can sort of fulfill the space limits thing (but I've never bothered using such a system and haven't been on a system that did). Append Only directories are a far harder beast to slay, but would very nicely fulfill many queue submission systems.