Squid Startup Requirement

I am currently working on requirement if any of the cache directories are
unavailable or unwritable, squid will not start. We would like the squid to
only refuse to start if "no" cache_dirs are available - if more than one is
configured but some are unavailable, we'd like it to log the error and
continue on with the known-good cache_dir(s).

I am able to do the required changes by having a global counter to track the
clean cache directories and based on the counter value not equal to zero i
am allowing squid to start.
 
But I am facing these problems
1) the directory cleanup event is trying to cleanup the unavailable or
unwritable cache directories
2) the objects are tried to cached into the unavailable or unwritable cache
directories.

As I am new to the squid, I would like to get some proper direction to
fulfill this requirement.
I am also mentioning the error messages that i am getting with this change

error messages got after the startup
008/04/15 10:41:31| storeDirClean: WARNING: Creating
/usr/local/squid.2.6_cachedir/cache/05/69 2008/04/15 10:41:31|
storeDirClean: /usr/local/squid.2.6_cachedir/cache/05/69: (2) No such file
or directory

this messages are coming during object caching
2008/04/17 06:35:39| storeAufsOpenDone: (2) No such file or directory
2008/04/17 06:35:39| /usr/local/squid.2.6_cachedir/cache/00/00/0000005E
2008/04/17 06:35:39| storeSwapOutFileClosed: dirno 5, swapfile 0000005E,
errflag=-1

Regards
Saleem

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