[Voyage-linux] How does RO/RW Filesystem work?

[Chris Morley]

Hi, to enable me to install packages and make symbolic links in the right places, would anyone be kind enough to clarify how the read only, read write file system works?
 
I have seen snippets in previous mailing list conversations: "The /ro directory is copied in the boot process to the /rw system which lives in a TMPFS structure, so, no power, no more bits."
 
However checking /ro/etc/ on my box:
route-hq:/etc# ls -ln /ro/etctotal 20-rw-r--r-- 1 0 0   44 Feb 17 00:22 adjtime-rw-r--r-- 1 0 0   28 Oct 28  2006 issue-rw-r--r-- 1 0 0   21 Oct 28  2006 issue.net-rw-r--r-- 1 0 0    0 Feb 29 14:49 mtab~drwxr-xr-x 3 0 0 4096 Feb 29 14:49 network-rw-r--r-- 1 0 0   53 Jul 28  2007 resolv.conf
 
and comparing with /etc/ i know /etc/ has a lot more files in it, so i don't understand or i cannot see how these files are getting copied from as they certainly don't seem to be coming from the /ro directory.
Also, looking at the scripts remountro and remountrw i see a binary called sync is called, is this a custom written application? Does it search the /rw file system for changes and write to /ro?
 
Many thanks,
 
Chris
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