diff options
author | Denis V. Lunev <den@openvz.org> | 2008-07-06 04:06:12 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2008-07-06 04:06:12 +0200 |
commit | 32cb5b4e035e3d7b52f1e9de87920645a00e5234 (patch) | |
tree | 54c26b95e4083e9ed6bb4593a2f940829779979b /net/ipv4/route.c | |
parent | netns: place rt_genid into struct net (diff) | |
download | linux-32cb5b4e035e3d7b52f1e9de87920645a00e5234.tar.xz linux-32cb5b4e035e3d7b52f1e9de87920645a00e5234.zip |
netns: selective flush of rt_cache
dst cache is marked as expired on the per/namespace basis by previous
path. Right now we have to implement selective cache shrinking. This
procedure has been ported from older OpenVz codebase.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r-- | net/ipv4/route.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 67c3ed772c27..113cd2512ba7 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -699,6 +699,7 @@ static void rt_do_flush(int process_context) { unsigned int i; struct rtable *rth, *next; + struct rtable * tail; for (i = 0; i <= rt_hash_mask; i++) { if (process_context && need_resched()) @@ -708,11 +709,39 @@ static void rt_do_flush(int process_context) continue; spin_lock_bh(rt_hash_lock_addr(i)); +#ifdef CONFIG_NET_NS + { + struct rtable ** prev, * p; + + rth = rt_hash_table[i].chain; + + /* defer releasing the head of the list after spin_unlock */ + for (tail = rth; tail; tail = tail->u.dst.rt_next) + if (!rt_is_expired(tail)) + break; + if (rth != tail) + rt_hash_table[i].chain = tail; + + /* call rt_free on entries after the tail requiring flush */ + prev = &rt_hash_table[i].chain; + for (p = *prev; p; p = next) { + next = p->u.dst.rt_next; + if (!rt_is_expired(p)) { + prev = &p->u.dst.rt_next; + } else { + *prev = next; + rt_free(p); + } + } + } +#else rth = rt_hash_table[i].chain; rt_hash_table[i].chain = NULL; + tail = NULL; +#endif spin_unlock_bh(rt_hash_lock_addr(i)); - for (; rth; rth = next) { + for (; rth != tail; rth = next) { next = rth->u.dst.rt_next; rt_free(rth); } |