tree 666e19bc85d1d9d87147aa657e40f3868984be32
parent 363c97d7435ebba8a040f86e29bdec79ee182f0c
author Julian Anastasov <ja@ssi.bg> 1363859888 +0200
committer Pablo Neira Ayuso <pablo@netfilter.org> 1364855023 +0200

ipvs: remove rs_lock by using RCU

rs_lock was used to protect rs_table (hash table)
from updaters (under global mutex) and readers (packet handlers).
We can remove rs_lock by using RCU lock for readers. Reclaiming
dest only with kfree_rcu is enough because the readers access
only fields from the ip_vs_dest structure.

Use hlist for rs_table.

As we are now using hlist_del_rcu, introduce in_rs_table
flag as replacement for the list_empty checks which do not
work with RCU. It is needed because only NAT dests are in
the rs_table.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off by: Hans Schillstrom <hans@schillstrom.com>
Signed-off-by: Simon Horman <horms@verge.net.au>