nullfs examples and implementation

[lakshmipathi]

I'm new to FreeBSD and interested in file systems. I looking at 'nullfs'. Do we have any example file system implemented with help of nullfs? .Thanks for any links/tutorials on it

 

[SirDice]

nullfs(5) isn't a 'real' filesystem. You can use it to mount directories, for lack of a better description. An example probably says more:
# mount -t nullfs /usr/ports /jail/j1/usr/ports
This will 'mount' the /usr/ports directory on /jail/j1/usr/ports/.

 

[lakshmipathi]

hmm..not sure.I came across this http://systhread.net/texts/200702nullfs1.php while reading about wrapfs http://www.filesystems.org/docs/zadok-thesis-proposal/node75.html