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:
committed by
David S. Miller
parent
e84f84f276
commit
32cb5b4e03
@@ -699,6 +699,7 @@ static void rt_do_flush(int process_context)
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{
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{
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unsigned int i;
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unsigned int i;
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struct rtable *rth, *next;
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struct rtable *rth, *next;
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struct rtable * tail;
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for (i = 0; i <= rt_hash_mask; i++) {
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for (i = 0; i <= rt_hash_mask; i++) {
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if (process_context && need_resched())
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if (process_context && need_resched())
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@@ -708,11 +709,39 @@ static void rt_do_flush(int process_context)
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continue;
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continue;
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spin_lock_bh(rt_hash_lock_addr(i));
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spin_lock_bh(rt_hash_lock_addr(i));
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#ifdef CONFIG_NET_NS
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{
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struct rtable ** prev, * p;
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rth = rt_hash_table[i].chain;
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/* defer releasing the head of the list after spin_unlock */
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for (tail = rth; tail; tail = tail->u.dst.rt_next)
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if (!rt_is_expired(tail))
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break;
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if (rth != tail)
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rt_hash_table[i].chain = tail;
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/* call rt_free on entries after the tail requiring flush */
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prev = &rt_hash_table[i].chain;
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for (p = *prev; p; p = next) {
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next = p->u.dst.rt_next;
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if (!rt_is_expired(p)) {
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prev = &p->u.dst.rt_next;
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} else {
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*prev = next;
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rt_free(p);
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}
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}
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}
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#else
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rth = rt_hash_table[i].chain;
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rth = rt_hash_table[i].chain;
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rt_hash_table[i].chain = NULL;
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rt_hash_table[i].chain = NULL;
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tail = NULL;
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#endif
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spin_unlock_bh(rt_hash_lock_addr(i));
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spin_unlock_bh(rt_hash_lock_addr(i));
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for (; rth; rth = next) {
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for (; rth != tail; rth = next) {
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next = rth->u.dst.rt_next;
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next = rth->u.dst.rt_next;
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rt_free(rth);
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rt_free(rth);
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}
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}
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