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netfilter: nfnetlink_log: RCU conversion, part 2

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- must use atomic_inc_not_zero() in instance_lookup_get()

- must use hlist_add_head_rcu() instead of hlist_add_head()

- must use hlist_del_rcu() instead of hlist_del()

- Introduce NFULNL_COPY_DISABLED to stop lockless reader from using an
instance, before we do final instance_put() on it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Eric Dumazet 2010-06-14 16:15:23 +02:00 • committed by Patrick McHardy
commit f5c5440d40
2 changed files with 13 additions and 6 deletions
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1
include/linux/netfilter/nfnetlink_log.h
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@ -89,6 +89,7 @@ enum nfulnl_attr_config {
#define NFULNL_COPY_NONE 0x00
#define NFULNL_COPY_META 0x01
#define NFULNL_COPY_PACKET 0x02
#define NFULNL_COPY_DISABLED 0x03
#define NFULNL_CFG_F_SEQ 0x0001
#define NFULNL_CFG_F_SEQ_GLOBAL 0x0002