Re: Add nc_timeout to struct namecache?

[David Holland <dholland-tech%netbsd.org@localhost>]

On Thu, Mar 22, 2012 at 08:37:39AM +0000, Emmanuel Dreyfus wrote:
 > In order to handle FUSE lookups TTL, I need to somehow keep track of
 > a node cache expiry date. I can do that in struct puffs_node, but that
 > mean I will lookup the cache, check expiry and decide to not use
 > cached entry if it is expired. In that case the entry remains in name cache,
 > and is even been refreshed because I looked it up. That does not seems
 > to be the right way.
 > 
 > The laternative is to add nc_tiemout in struct  namecache, and add a 
 > timeout argument to cache_enter. If zero, then previous name cache 
 > behavior is used. If non-zero, it specify when cache_prune must get
 > rid of the entry, by using nc_timeout instead of nc_hittime.
 > 
 > Opinions?

What does NFS do?

I have to look into this code and probably beat on it severely to make
progress on the namei cleanup, but I haven't done so yet so I don't
really know how it works yet.

-- 
David A. Holland
dholland%netbsd.org@localhost