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SUNRPC: Give credential cache a local spinlock

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-06-24 15:57:57 -04:00
parent 31be5bf15f
commit 9499b4341b
4 changed files with 41 additions and 14 deletions
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46
net/sunrpc/auth.c
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@ -120,6 +120,18 @@ rpcauth_unhash_cred_locked(struct rpc_cred *cred)
clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
}
static void
rpcauth_unhash_cred(struct rpc_cred *cred)
{
spinlock_t *cache_lock;
cache_lock = &cred->cr_auth->au_credcache->lock;
spin_lock(cache_lock);
if (atomic_read(&cred->cr_count) == 0)
rpcauth_unhash_cred_locked(cred);
spin_unlock(cache_lock);
}
/*
* Initialize RPC credential cache
*/
@ -134,6 +146,7 @@ rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
return -ENOMEM;
for (i = 0; i < RPC_CREDCACHE_NR; i++)
INIT_HLIST_HEAD(&new->hashtable[i]);
spin_lock_init(&new->lock);
new->expire = expire;
new->nextgc = jiffies + (expire >> 1);
auth->au_credcache = new;
@ -168,6 +181,7 @@ rpcauth_clear_credcache(struct rpc_cred_cache *cache)
int i;
spin_lock(&rpc_credcache_lock);
spin_lock(&cache->lock);
for (i = 0; i < RPC_CREDCACHE_NR; i++) {
head = &cache->hashtable[i];
while (!hlist_empty(head)) {
@ -177,6 +191,7 @@ rpcauth_clear_credcache(struct rpc_cred_cache *cache)
rpcauth_unhash_cred_locked(cred);
}
}
spin_unlock(&cache->lock);
spin_unlock(&rpc_credcache_lock);
rpcauth_destroy_credlist(&free);
}
@ -202,6 +217,7 @@ rpcauth_destroy_credcache(struct rpc_auth *auth)
static void
rpcauth_prune_expired(struct list_head *free)
{
spinlock_t *cache_lock;
struct rpc_cred *cred;
while (!list_empty(&cred_unused)) {
@ -212,9 +228,14 @@ rpcauth_prune_expired(struct list_head *free)
list_del_init(&cred->cr_lru);
if (atomic_read(&cred->cr_count) != 0)
continue;
get_rpccred(cred);
list_add_tail(&cred->cr_lru, free);
rpcauth_unhash_cred_locked(cred);
cache_lock = &cred->cr_auth->au_credcache->lock;
spin_lock(cache_lock);
if (atomic_read(&cred->cr_count) == 0) {
get_rpccred(cred);
list_add_tail(&cred->cr_lru, free);
rpcauth_unhash_cred_locked(cred);
}
spin_unlock(cache_lock);
}
}
@ -253,21 +274,19 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
hlist_for_each_entry_rcu(entry, pos, &cache->hashtable[nr], cr_hash) {
if (!entry->cr_ops->crmatch(acred, entry, flags))
continue;
spin_lock(&rpc_credcache_lock);
spin_lock(&cache->lock);
if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) {
spin_unlock(&rpc_credcache_lock);
spin_unlock(&cache->lock);
continue;
}
cred = get_rpccred(entry);
spin_unlock(&rpc_credcache_lock);
spin_unlock(&cache->lock);
break;
}
rcu_read_unlock();
if (cred != NULL) {
rpcauth_gc_credcache(cache, &free);
if (cred != NULL)
goto found;
}
new = auth->au_ops->crcreate(auth, acred, flags);
if (IS_ERR(new)) {
@ -275,7 +294,7 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
goto out;
}
spin_lock(&rpc_credcache_lock);
spin_lock(&cache->lock);
hlist_for_each_entry(entry, pos, &cache->hashtable[nr], cr_hash) {
if (!entry->cr_ops->crmatch(acred, entry, flags))
continue;
@ -288,9 +307,7 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]);
} else
list_add_tail(&new->cr_lru, &free);
rpcauth_prune_expired(&free);
cache->nextgc = jiffies + cache->expire;
spin_unlock(&rpc_credcache_lock);
spin_unlock(&cache->lock);
found:
if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)
&& cred->cr_ops->cr_init != NULL
@ -301,6 +318,7 @@ found:
cred = ERR_PTR(res);
}
}
rpcauth_gc_credcache(cache, &free);
rpcauth_destroy_credlist(&free);
out:
return cred;
@ -393,7 +411,7 @@ need_lock:
if (!list_empty(&cred->cr_lru))
list_del_init(&cred->cr_lru);
if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
rpcauth_unhash_cred_locked(cred);
rpcauth_unhash_cred(cred);
else if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
cred->cr_expire = jiffies;
list_add_tail(&cred->cr_lru, &cred_unused);