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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>
This commit is contained in:
Denis V. Lunev 2008-07-05 19:06:12 -07:00 committed by David S. Miller
parent e84f84f276
commit 32cb5b4e03
1 changed files with 30 additions and 1 deletions
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31
net/ipv4/route.c
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@ -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);
}