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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 08-22-2012, 02:27 AM
Sasha Levin
 
Default SUNRPC: use new hashtable implementation in auth

Switch sunrpc/auth.c to use the new hashtable implementation. This reduces the amount of
generic unrelated code in auth.c.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
net/sunrpc/auth.c | 45 +++++++++++++++++++--------------------------
1 files changed, 19 insertions(+), 26 deletions(-)

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index b5c067b..5d50e2d 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -15,6 +15,7 @@
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/gss_api.h>
#include <linux/spinlock.h>
+#include <linux/hashtable.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
@@ -222,7 +223,7 @@ static DEFINE_SPINLOCK(rpc_credcache_lock);
static void
rpcauth_unhash_cred_locked(struct rpc_cred *cred)
{
- hlist_del_rcu(&cred->cr_hash);
+ hash_del_rcu(&cred->cr_hash);
smp_mb__before_clear_bit();
clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
}
@@ -249,16 +250,15 @@ int
rpcauth_init_credcache(struct rpc_auth *auth)
{
struct rpc_cred_cache *new;
- unsigned int hashsize;

new = kmalloc(sizeof(*new), GFP_KERNEL);
if (!new)
goto out_nocache;
new->hashbits = auth_hashbits;
- hashsize = 1U << new->hashbits;
- new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL);
+ new->hashtable = kmalloc(HASH_REQUIRED_SIZE(new->hashbits), GFP_KERNEL);
if (!new->hashtable)
goto out_nohashtbl;
+ hash_init_size(new->hashtable, new->hashbits);
spin_lock_init(&new->lock);
auth->au_credcache = new;
return 0;
@@ -292,25 +292,20 @@ void
rpcauth_clear_credcache(struct rpc_cred_cache *cache)
{
LIST_HEAD(free);
- struct hlist_head *head;
+ struct hlist_node *n, *t;
struct rpc_cred *cred;
- unsigned int hashsize = 1U << cache->hashbits;
- int i;
+ int i;

spin_lock(&rpc_credcache_lock);
spin_lock(&cache->lock);
- for (i = 0; i < hashsize; i++) {
- head = &cache->hashtable[i];
- while (!hlist_empty(head)) {
- cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
- get_rpccred(cred);
- if (!list_empty(&cred->cr_lru)) {
- list_del(&cred->cr_lru);
- number_cred_unused--;
- }
- list_add_tail(&cred->cr_lru, &free);
- rpcauth_unhash_cred_locked(cred);
+ hash_for_each_safe_size(cache->hashtable, cache->hashbits, i, n, t, cred, cr_hash) {
+ get_rpccred(cred);
+ if (!list_empty(&cred->cr_lru)) {
+ list_del(&cred->cr_lru);
+ number_cred_unused--;
}
+ list_add_tail(&cred->cr_lru, &free);
+ rpcauth_unhash_cred_locked(cred);
}
spin_unlock(&cache->lock);
spin_unlock(&rpc_credcache_lock);
@@ -408,14 +403,11 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
LIST_HEAD(free);
struct rpc_cred_cache *cache = auth->au_credcache;
struct hlist_node *pos;
- struct rpc_cred *cred = NULL,
- *entry, *new;
- unsigned int nr;
-
- nr = hash_long(acred->uid, cache->hashbits);
+ struct rpc_cred *cred = NULL, *entry = NULL, *new;

rcu_read_lock();
- hlist_for_each_entry_rcu(entry, pos, &cache->hashtable[nr], cr_hash) {
+ hash_for_each_possible_rcu_size(cache->hashtable, cred, cache->hashbits,
+ pos, cr_hash, acred->uid) {
if (!entry->cr_ops->crmatch(acred, entry, flags))
continue;
spin_lock(&cache->lock);
@@ -439,7 +431,8 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
}

spin_lock(&cache->lock);
- hlist_for_each_entry(entry, pos, &cache->hashtable[nr], cr_hash) {
+ hash_for_each_possible_size(cache->hashtable, entry, cache->hashbits, pos,
+ cr_hash, acred->uid) {
if (!entry->cr_ops->crmatch(acred, entry, flags))
continue;
cred = get_rpccred(entry);
@@ -448,7 +441,7 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
if (cred == NULL) {
cred = new;
set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
- hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]);
+ hash_add_size(cache->hashtable, cache->hashbits, &cred->cr_hash, acred->uid);
} else
list_add_tail(&new->cr_lru, &free);
spin_unlock(&cache->lock);
--
1.7.8.6

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