On Fri, 25 Jan 2008 09:23:00 +0100 Jarek Poplawski <[EMAIL PROTECTED]> wrote:
> On 24-01-2008 22:51, Stephen Hemminger wrote: > > Normally during a dump the key of the last dumped entry is used for > > continuation, but since lock is dropped it might be lost. In that case > > fallback to the old counter based N^2 behaviour. This means the dump will > > end up > > skipping some routes which matches what FIB_HASH does. > > > > Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]> > ... > > @@ -1918,35 +1931,37 @@ static int fn_trie_dump(struct fib_table > > struct leaf *l; > > struct trie *t = (struct trie *) tb->tb_data; > > t_key key = cb->args[2]; > > + int count = cb->args[3]; > > > > rcu_read_lock(); > > Sorry, but I lost the point: is rtnl held or not held here at the moment? > If held, how this rcu_read_lock can help? Maybe some additional comment > in the code? > > Thanks, > Jarek P. There are two different issues, (therefore two different patches). 1. How to handle multipart resume when the key was deleted during the period the lock was dropped. That is what this patch addresses. 2. RCU is unnecessary here because of use of RTNL. I am going to defer on this till after #1. That patch is much less important. -- Stephen Hemminger <[EMAIL PROTECTED]> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
