tracing at filesystem level

[devzero@web.de]

Hello,

i`d like to be able to trace filesystem access at early boot time, i.e to see what files being opened/closed on early boot (and later on).

one possible way to do it is using nfs-root, so we can trace it at the network or server level -  but how can this be done without using network filesystem ?

i came across tracefs (http://www.filesystems.org/docs/tracefs-fast04/tracefs.pdf) which looks very promising, but it seems it`s not actively maintained.

isn`t there a standard way to do that with recent kernels ?
i searched for a while but didn`t find something appropriate....

regards
Roland

ps:
this is also very interesting for intrusion detection - think of virtual machine`s filesystem activity being watched trough serial console (i.e. 
with nothing running in userspace and without hackers ability to disable it)
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