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inet: frag: use seqlock for hash rebuild

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rehash is rare operation, don't force readers to take
the read-side rwlock.

Instead, we only have to detect the (rare) case where
the secret was altered while we are trying to insert
a new inetfrag queue into the table.

If it was changed, drop the bucket lock and recompute
the hash to get the 'new' chain bucket that we have to
insert into.

Joint work with Nikolay Aleksandrov.

Signed-off-by: Florian Westphal <[email protected]>
Signed-off-by: Nikolay Aleksandrov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Florian Westphal 2014-07-24 16:50:36 +02:00 • committed by David S. Miller
commit ab1c724f63
6 changed files with 62 additions and 44 deletions
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2
net/ipv6/netfilter/nf_conntrack_reasm.c
View file

@ -193,7 +193,7 @@ static inline struct frag_queue *fq_find(struct net *net, __be32 id,
arg.dst = dst;
arg.ecn = ecn;
read_lock_bh(&nf_frags.lock);
local_bh_disable();
hash = nf_hash_frag(id, src, dst);
q = inet_frag_find(&net->nf_frag.frags, &nf_frags, &arg, hash);

1
net/ipv6/reassembly.c
View file

@ -190,7 +190,6 @@ fq_find(struct net *net, __be32 id, const struct in6_addr *src,
arg.dst = dst;
arg.ecn = ecn;
read_lock(&ip6_frags.lock);
hash = inet6_hash_frag(id, src, dst);
q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash);