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SUNRPC: Make server side AUTH_UNIX use lockless lookups 

Convert structs ip_map and unix_gid to use RCU protected lookups.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2018-10-01 10:41:46 -04:00 committed by J. Bruce Fields
parent ae74136b4b
commit fd5d2f7826
1 changed files with 8 additions and 6 deletions
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14
net/sunrpc/svcauth_unix.c
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@ -97,6 +97,7 @@ struct ip_map {
char m_class[8]; /* e.g. "nfsd" */
struct in6_addr m_addr;
struct unix_domain *m_client;
struct rcu_head m_rcu;
};
static void ip_map_put(struct kref *kref)
@ -107,7 +108,7 @@ static void ip_map_put(struct kref *kref)
if (test_bit(CACHE_VALID, &item->flags) &&
!test_bit(CACHE_NEGATIVE, &item->flags))
auth_domain_put(&im->m_client->h);
kfree(im);
kfree_rcu(im, m_rcu);
}
static inline int hash_ip6(const struct in6_addr *ip)
@ -286,9 +287,9 @@ static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
strcpy(ip.m_class, class);
ip.m_addr = *addr;
ch = sunrpc_cache_lookup(cd, &ip.h,
hash_str(class, IP_HASHBITS) ^
hash_ip6(addr));
ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
hash_str(class, IP_HASHBITS) ^
hash_ip6(addr));
if (ch)
return container_of(ch, struct ip_map, h);
@ -418,6 +419,7 @@ struct unix_gid {
struct cache_head h;
kuid_t uid;
struct group_info *gi;
struct rcu_head rcu;
};
static int unix_gid_hash(kuid_t uid)
@ -432,7 +434,7 @@ static void unix_gid_put(struct kref *kref)
if (test_bit(CACHE_VALID, &item->flags) &&
!test_bit(CACHE_NEGATIVE, &item->flags))
put_group_info(ug->gi);
kfree(ug);
kfree_rcu(ug, rcu);
}
static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
@ -625,7 +627,7 @@ static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
struct cache_head *ch;
ug.uid = uid;
ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
if (ch)
return container_of(ch, struct unix_gid, h);
else