Re: [PATCH 2/3] NFS: Add NFS_MOUNT_NONEGDE flag to avoid caching negative dentries

[Bob Bell <b_linuxnfs-Y/+76LoPTq9wBoktGHYdvgC/G2K4zDHf@public.gmane.org>]

On Wed, Jan 16, 2008 at 03:49:20PM -0500, Chuck Lever wrote:
>On Jan 16, 2008, at 3:43 PM, Trond Myklebust wrote:
>>How about
>>         -odircache=aggr[essive]	/* Full caching */
>>         -odircache=noneg[ative]	/* Positive lookups only */
>>         -odircache=off		/* strict lookup revalidation */
>
>  "-olookupcache=" would be even more specific, if not more verbose.   
>dircache=off implies that not even readdir results are cached.
>
>	-olookupcache=full
>	-olookupcache=pos[itive]
>	-olookupcache=strict

I think that "lookupcache" is a little more accurate, and perhaps worth 
the verbosity.  "dircache" could be misinterpreted to imply that 
directory listings are being cached -- which, incidentally, I'm start to 
receive complaints is a problem for us, too...

Converstation on this seems to have died down, and I'm ready to revisit 
the patch.  I'm inclined to go with:
    -o lookupcache=full
    -o lookupcache=pos[itive]
    -o lookupcache=none

If you have a strong (enough) opinion otherwise, please speak up now and 
save me the trouble of an extra pass at the patch...

-- 
Bob Bell