Merge git://git.linux-nfs.org/pub/linux/nfs-2.6

* git://git.linux-nfs.org/pub/linux/nfs-2.6: (122 commits)
  sunrpc: drop BKL around wrap and unwrap
  NFSv4: Make sure unlock is really an unlock when cancelling a lock
  NLM: fix source address of callback to client
  SUNRPC client: add interface for binding to a local address
  SUNRPC server: record the destination address of a request
  SUNRPC: cleanup transport creation argument passing
  NFSv4: Make the NFS state model work with the nosharedcache mount option
  NFS: Error when mounting the same filesystem with different options
  NFS: Add the mount option "nosharecache"
  NFS: Add support for mounting NFSv4 file systems with string options
  NFS: Add final pieces to support in-kernel mount option parsing
  NFS: Introduce generic mount client API
  NFS: Add enums and match tables for mount option parsing
  NFS: Improve debugging output in NFS in-kernel mount client
  NFS: Clean up in-kernel NFS mount
  NFS: Remake nfsroot_mount as a permanent part of NFS client
  SUNRPC: Add a convenient default for the hostname when calling rpc_create()
  SUNRPC: Rename rpcb_getport to be consistent with new rpcb_getport_sync name
  SUNRPC: Rename rpcb_getport_external routine
  SUNRPC: Allow rpcbind requests to be interrupted by a signal.
  ...

1 files changed, 256 insertions, 114 deletions

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 9527f2bb1744..aa55d0a03e6f 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -13,17 +13,22 @@
 #include <linux/errno.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/spinlock.h>
+#include <linux/smp_lock.h>
 
 #ifdef RPC_DEBUG
 # define RPCDBG_FACILITY        RPCDBG_AUTH
 #endif
 
-static struct rpc_authops *     auth_flavors[RPC_AUTH_MAXFLAVOR] = {
+static DEFINE_SPINLOCK(rpc_authflavor_lock);
+static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = {
         &authnull_ops,          /* AUTH_NULL */
         &authunix_ops,          /* AUTH_UNIX */
         NULL,                   /* others can be loadable modules */
 };
 
+static LIST_HEAD(cred_unused);
+static unsigned long number_cred_unused;
+
 static u32
 pseudoflavor_to_flavor(u32 flavor) {
         if (flavor >= RPC_AUTH_MAXFLAVOR)
@@ -32,55 +37,67 @@ pseudoflavor_to_flavor(u32 flavor) {
 }
 
 int
-rpcauth_register(struct rpc_authops *ops)
+rpcauth_register(const struct rpc_authops *ops)
 {
         rpc_authflavor_t flavor;
+        int ret = -EPERM;
 
         if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
                 return -EINVAL;
-        if (auth_flavors[flavor] != NULL)
-                return -EPERM;          /* what else? */
-        auth_flavors[flavor] = ops;
-        return 0;
+        spin_lock(&rpc_authflavor_lock);
+        if (auth_flavors[flavor] == NULL) {
+                auth_flavors[flavor] = ops;
+                ret = 0;
+        }
+        spin_unlock(&rpc_authflavor_lock);
+        return ret;
 }
 
 int
-rpcauth_unregister(struct rpc_authops *ops)
+rpcauth_unregister(const struct rpc_authops *ops)
 {
         rpc_authflavor_t flavor;
+        int ret = -EPERM;
 
         if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
                 return -EINVAL;
-        if (auth_flavors[flavor] != ops)
-                return -EPERM;          /* what else? */
-        auth_flavors[flavor] = NULL;
-        return 0;
+        spin_lock(&rpc_authflavor_lock);
+        if (auth_flavors[flavor] == ops) {
+                auth_flavors[flavor] = NULL;
+                ret = 0;
+        }
+        spin_unlock(&rpc_authflavor_lock);
+        return ret;
 }
 
 struct rpc_auth *
 rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
 {
         struct rpc_auth         *auth;
-        struct rpc_authops      *ops;
+        const struct rpc_authops *ops;
         u32                     flavor = pseudoflavor_to_flavor(pseudoflavor);
 
         auth = ERR_PTR(-EINVAL);
         if (flavor >= RPC_AUTH_MAXFLAVOR)
                 goto out;
 
-        /* FIXME - auth_flavors[] really needs an rw lock,
-         * and module refcounting. */
 #ifdef CONFIG_KMOD
         if ((ops = auth_flavors[flavor]) == NULL)
                 request_module("rpc-auth-%u", flavor);
 #endif
-        if ((ops = auth_flavors[flavor]) == NULL)
+        spin_lock(&rpc_authflavor_lock);
+        ops = auth_flavors[flavor];
+        if (ops == NULL || !try_module_get(ops->owner)) {
+                spin_unlock(&rpc_authflavor_lock);
                 goto out;
+        }
+        spin_unlock(&rpc_authflavor_lock);
         auth = ops->create(clnt, pseudoflavor);
+        module_put(ops->owner);
         if (IS_ERR(auth))
                 return auth;
         if (clnt->cl_auth)
-                rpcauth_destroy(clnt->cl_auth);
+                rpcauth_release(clnt->cl_auth);
         clnt->cl_auth = auth;
 
 out:
@@ -88,7 +105,7 @@ out:
 }
 
 void
-rpcauth_destroy(struct rpc_auth *auth)
+rpcauth_release(struct rpc_auth *auth)
 {
         if (!atomic_dec_and_test(&auth->au_count))
                 return;
@@ -97,11 +114,31 @@ rpcauth_destroy(struct rpc_auth *auth)
 
 static DEFINE_SPINLOCK(rpc_credcache_lock);
 
+static void
+rpcauth_unhash_cred_locked(struct rpc_cred *cred)
+{
+        hlist_del_rcu(&cred->cr_hash);
+        smp_mb__before_clear_bit();
+        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
  */
 int
-rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
+rpcauth_init_credcache(struct rpc_auth *auth)
 {
         struct rpc_cred_cache *new;
         int i;
@@ -111,8 +148,7 @@ 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]);
-        new->expire = expire;
-        new->nextgc = jiffies + (expire >> 1);
+        spin_lock_init(&new->lock);
         auth->au_credcache = new;
         return 0;
 }
@@ -121,13 +157,13 @@ rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
  * Destroy a list of credentials
  */
 static inline
-void rpcauth_destroy_credlist(struct hlist_head *head)
+void rpcauth_destroy_credlist(struct list_head *head)
 {
         struct rpc_cred *cred;
 
-        while (!hlist_empty(head)) {
-                cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
-                hlist_del_init(&cred->cr_hash);
+        while (!list_empty(head)) {
+                cred = list_entry(head->next, struct rpc_cred, cr_lru);
+                list_del_init(&cred->cr_lru);
                 put_rpccred(cred);
         }
 }
@@ -137,58 +173,95 @@ void rpcauth_destroy_credlist(struct hlist_head *head)
  * that are not referenced.
  */
 void
-rpcauth_free_credcache(struct rpc_auth *auth)
+rpcauth_clear_credcache(struct rpc_cred_cache *cache)
 {
-        struct rpc_cred_cache *cache = auth->au_credcache;
-        HLIST_HEAD(free);
-        struct hlist_node *pos, *next;
+        LIST_HEAD(free);
+        struct hlist_head *head;
         struct rpc_cred *cred;
         int             i;
 
         spin_lock(&rpc_credcache_lock);
+        spin_lock(&cache->lock);
         for (i = 0; i < RPC_CREDCACHE_NR; i++) {
-                hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
-                        cred = hlist_entry(pos, struct rpc_cred, cr_hash);
-                        __hlist_del(&cred->cr_hash);
-                        hlist_add_head(&cred->cr_hash, &free);
+                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);
                 }
         }
+        spin_unlock(&cache->lock);
         spin_unlock(&rpc_credcache_lock);
         rpcauth_destroy_credlist(&free);
 }
 
-static void
-rpcauth_prune_expired(struct rpc_auth *auth, struct rpc_cred *cred, struct hlist_head *free)
+/*
+ * Destroy the RPC credential cache
+ */
+void
+rpcauth_destroy_credcache(struct rpc_auth *auth)
 {
-        if (atomic_read(&cred->cr_count) != 1)
-               return;
-        if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
-                cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
-        if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
-                __hlist_del(&cred->cr_hash);
-                hlist_add_head(&cred->cr_hash, free);
+        struct rpc_cred_cache *cache = auth->au_credcache;
+
+        if (cache) {
+                auth->au_credcache = NULL;
+                rpcauth_clear_credcache(cache);
+                kfree(cache);
         }
 }
 
 /*
  * Remove stale credentials. Avoid sleeping inside the loop.
  */
-static void
-rpcauth_gc_credcache(struct rpc_auth *auth, struct hlist_head *free)
+static int
+rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
 {
-        struct rpc_cred_cache *cache = auth->au_credcache;
-        struct hlist_node *pos, *next;
-        struct rpc_cred *cred;
-        int             i;
+        spinlock_t *cache_lock;
+        struct rpc_cred *cred;
 
-        dprintk("RPC:       gc'ing RPC credentials for auth %p\n", auth);
-        for (i = 0; i < RPC_CREDCACHE_NR; i++) {
-                hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
-                        cred = hlist_entry(pos, struct rpc_cred, cr_hash);
-                        rpcauth_prune_expired(auth, cred, free);
+        while (!list_empty(&cred_unused)) {
+                cred = list_entry(cred_unused.next, struct rpc_cred, cr_lru);
+                list_del_init(&cred->cr_lru);
+                number_cred_unused--;
+                if (atomic_read(&cred->cr_count) != 0)
+                        continue;
+                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);
+                        nr_to_scan--;
                 }
+                spin_unlock(cache_lock);
+                if (nr_to_scan == 0)
+                        break;
         }
-        cache->nextgc = jiffies + cache->expire;
+        return nr_to_scan;
+}
+
+/*
+ * Run memory cache shrinker.
+ */
+static int
+rpcauth_cache_shrinker(int nr_to_scan, gfp_t gfp_mask)
+{
+        LIST_HEAD(free);
+        int res;
+
+        if (list_empty(&cred_unused))
+                return 0;
+        spin_lock(&rpc_credcache_lock);
+        nr_to_scan = rpcauth_prune_expired(&free, nr_to_scan);
+        res = (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
+        spin_unlock(&rpc_credcache_lock);
+        rpcauth_destroy_credlist(&free);
+        return res;
 }
 
 /*
@@ -198,53 +271,56 @@ struct rpc_cred *
 rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
                 int flags)
 {
+        LIST_HEAD(free);
         struct rpc_cred_cache *cache = auth->au_credcache;
-        HLIST_HEAD(free);
-        struct hlist_node *pos, *next;
-        struct rpc_cred *new = NULL,
-                        *cred = NULL;
+        struct hlist_node *pos;
+        struct rpc_cred *cred = NULL,
+                        *entry, *new;
         int             nr = 0;
 
         if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS))
                 nr = acred->uid & RPC_CREDCACHE_MASK;
-retry:
-        spin_lock(&rpc_credcache_lock);
-        if (time_before(cache->nextgc, jiffies))
-                rpcauth_gc_credcache(auth, &free);
-        hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
-                struct rpc_cred *entry;
-                entry = hlist_entry(pos, struct rpc_cred, cr_hash);
-                if (entry->cr_ops->crmatch(acred, entry, flags)) {
-                        hlist_del(&entry->cr_hash);
-                        cred = entry;
-                        break;
+
+        rcu_read_lock();
+        hlist_for_each_entry_rcu(entry, pos, &cache->hashtable[nr], cr_hash) {
+                if (!entry->cr_ops->crmatch(acred, entry, flags))
+                        continue;
+                spin_lock(&cache->lock);
+                if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) {
+                        spin_unlock(&cache->lock);
+                        continue;
                 }
-                rpcauth_prune_expired(auth, entry, &free);
+                cred = get_rpccred(entry);
+                spin_unlock(&cache->lock);
+                break;
         }
-        if (new) {
-                if (cred)
-                        hlist_add_head(&new->cr_hash, &free);
-                else
-                        cred = new;
-        }
-        if (cred) {
-                hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
-                get_rpccred(cred);
-        }
-        spin_unlock(&rpc_credcache_lock);
+        rcu_read_unlock();
 
-        rpcauth_destroy_credlist(&free);
+        if (cred != NULL)
+                goto found;
 
-        if (!cred) {
-                new = auth->au_ops->crcreate(auth, acred, flags);
-                if (!IS_ERR(new)) {
-#ifdef RPC_DEBUG
-                        new->cr_magic = RPCAUTH_CRED_MAGIC;
-#endif
-                        goto retry;
-                } else
-                        cred = new;
-        } else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
+        new = auth->au_ops->crcreate(auth, acred, flags);
+        if (IS_ERR(new)) {
+                cred = new;
+                goto out;
+        }
+
+        spin_lock(&cache->lock);
+        hlist_for_each_entry(entry, pos, &cache->hashtable[nr], cr_hash) {
+                if (!entry->cr_ops->crmatch(acred, entry, flags))
+                        continue;
+                cred = get_rpccred(entry);
+                break;
+        }
+        if (cred == NULL) {
+                cred = new;
+                set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
+                hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]);
+        } else
+                list_add_tail(&new->cr_lru, &free);
+        spin_unlock(&cache->lock);
+found:
+        if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)
                         && cred->cr_ops->cr_init != NULL
                         && !(flags & RPCAUTH_LOOKUP_NEW)) {
                 int res = cred->cr_ops->cr_init(auth, cred);
@@ -253,8 +329,9 @@ retry:
                         cred = ERR_PTR(res);
                 }
         }
-
-        return (struct rpc_cred *) cred;
+        rpcauth_destroy_credlist(&free);
+out:
+        return cred;
 }
 
 struct rpc_cred *
@@ -275,10 +352,27 @@ rpcauth_lookupcred(struct rpc_auth *auth, int flags)
         return ret;
 }
 
+void
+rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred,
+                  struct rpc_auth *auth, const struct rpc_credops *ops)
+{
+        INIT_HLIST_NODE(&cred->cr_hash);
+        INIT_LIST_HEAD(&cred->cr_lru);
+        atomic_set(&cred->cr_count, 1);
+        cred->cr_auth = auth;
+        cred->cr_ops = ops;
+        cred->cr_expire = jiffies;
+#ifdef RPC_DEBUG
+        cred->cr_magic = RPCAUTH_CRED_MAGIC;
+#endif
+        cred->cr_uid = acred->uid;
+}
+EXPORT_SYMBOL(rpcauth_init_cred);
+
 struct rpc_cred *
 rpcauth_bindcred(struct rpc_task *task)
 {
-        struct rpc_auth *auth = task->tk_auth;
+        struct rpc_auth *auth = task->tk_client->cl_auth;
         struct auth_cred acred = {
                 .uid = current->fsuid,
                 .gid = current->fsgid,
@@ -288,7 +382,7 @@ rpcauth_bindcred(struct rpc_task *task)
         int flags = 0;
 
         dprintk("RPC: %5u looking up %s cred\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name);
+                task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
         get_group_info(acred.group_info);
         if (task->tk_flags & RPC_TASK_ROOTCREDS)
                 flags |= RPCAUTH_LOOKUP_ROOTCREDS;
@@ -304,19 +398,42 @@ rpcauth_bindcred(struct rpc_task *task)
 void
 rpcauth_holdcred(struct rpc_task *task)
 {
-        dprintk("RPC: %5u holding %s cred %p\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name,
-                task->tk_msg.rpc_cred);
-        if (task->tk_msg.rpc_cred)
-                get_rpccred(task->tk_msg.rpc_cred);
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+        if (cred != NULL) {
+                get_rpccred(cred);
+                dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid,
+                                cred->cr_auth->au_ops->au_name, cred);
+        }
 }
 
 void
 put_rpccred(struct rpc_cred *cred)
 {
-        cred->cr_expire = jiffies;
+        /* Fast path for unhashed credentials */
+        if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0)
+                goto need_lock;
+
         if (!atomic_dec_and_test(&cred->cr_count))
                 return;
+        goto out_destroy;
+need_lock:
+        if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock))
+                return;
+        if (!list_empty(&cred->cr_lru)) {
+                number_cred_unused--;
+                list_del_init(&cred->cr_lru);
+        }
+        if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
+                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);
+                number_cred_unused++;
+                spin_unlock(&rpc_credcache_lock);
+                return;
+        }
+        spin_unlock(&rpc_credcache_lock);
+out_destroy:
         cred->cr_ops->crdestroy(cred);
 }
 
@@ -326,7 +443,7 @@ rpcauth_unbindcred(struct rpc_task *task)
         struct rpc_cred *cred = task->tk_msg.rpc_cred;
 
         dprintk("RPC: %5u releasing %s cred %p\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name, cred);
+                task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
 
         put_rpccred(cred);
         task->tk_msg.rpc_cred = NULL;
@@ -338,7 +455,7 @@ rpcauth_marshcred(struct rpc_task *task, __be32 *p)
         struct rpc_cred *cred = task->tk_msg.rpc_cred;
 
         dprintk("RPC: %5u marshaling %s cred %p\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name, cred);
+                task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
 
         return cred->cr_ops->crmarshal(task, p);
 }
@@ -349,7 +466,7 @@ rpcauth_checkverf(struct rpc_task *task, __be32 *p)
         struct rpc_cred *cred = task->tk_msg.rpc_cred;
 
         dprintk("RPC: %5u validating %s cred %p\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name, cred);
+                task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
 
         return cred->cr_ops->crvalidate(task, p);
 }
@@ -359,13 +476,17 @@ rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
                 __be32 *data, void *obj)
 {
         struct rpc_cred *cred = task->tk_msg.rpc_cred;
+        int ret;
 
         dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
                         task->tk_pid, cred->cr_ops->cr_name, cred);
         if (cred->cr_ops->crwrap_req)
                 return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
         /* By default, we encode the arguments normally. */
-        return encode(rqstp, data, obj);
+        lock_kernel();
+        ret = encode(rqstp, data, obj);
+        unlock_kernel();
+        return ret;
 }
 
 int
@@ -373,6 +494,7 @@ rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
                 __be32 *data, void *obj)
 {
         struct rpc_cred *cred = task->tk_msg.rpc_cred;
+        int ret;
 
         dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
                         task->tk_pid, cred->cr_ops->cr_name, cred);
@@ -380,7 +502,10 @@ rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
                 return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
                                                    data, obj);
         /* By default, we decode the arguments normally. */
-        return decode(rqstp, data, obj);
+        lock_kernel();
+        ret = decode(rqstp, data, obj);
+        unlock_kernel();
+        return ret;
 }
 
 int
@@ -390,7 +515,7 @@ rpcauth_refreshcred(struct rpc_task *task)
         int err;
 
         dprintk("RPC: %5u refreshing %s cred %p\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name, cred);
+                task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
 
         err = cred->cr_ops->crrefresh(task);
         if (err < 0)
@@ -401,17 +526,34 @@ rpcauth_refreshcred(struct rpc_task *task)
 void
 rpcauth_invalcred(struct rpc_task *task)
 {
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
         dprintk("RPC: %5u invalidating %s cred %p\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
-        spin_lock(&rpc_credcache_lock);
-        if (task->tk_msg.rpc_cred)
-                task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
-        spin_unlock(&rpc_credcache_lock);
+                task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
+        if (cred)
+                clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
 }
 
 int
 rpcauth_uptodatecred(struct rpc_task *task)
 {
-        return !(task->tk_msg.rpc_cred) ||
-                (task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
+        return cred == NULL ||
+                test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0;
+}
+
+
+static struct shrinker *rpc_cred_shrinker;
+
+void __init rpcauth_init_module(void)
+{
+        rpc_init_authunix();
+        rpc_cred_shrinker = set_shrinker(DEFAULT_SEEKS, rpcauth_cache_shrinker);
+}
+
+void __exit rpcauth_remove_module(void)
+{
+        if (rpc_cred_shrinker != NULL)
+                remove_shrinker(rpc_cred_shrinker);
 }