security,rcu: convert call_rcu(user_update_rcu_disposal) to kfree_rcu()

[linux-2.6.git] / security / keys / user_defined.c

diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index 8e71895..f66baf4 100644 (file)
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -11,7 +11,6 @@
 
 #include <linux/module.h>
 #include <linux/init.h>
-#include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/seq_file.h>
 #include <linux/err.h>
@@ -28,6 +27,7 @@ struct key_type key_type_user = {
        .instantiate    = user_instantiate,
        .update         = user_update,
        .match          = user_match,
+       .revoke         = user_revoke,
        .destroy        = user_destroy,
        .describe       = user_describe,
        .read           = user_read,
@@ -35,7 +35,6 @@ struct key_type key_type_user = {
 
 EXPORT_SYMBOL_GPL(key_type_user);
 
-/*****************************************************************************/
 /*
  * instantiate a user defined key
  */
@@ -65,25 +64,10 @@ int user_instantiate(struct key *key, const void *data, size_t datalen)
 
 error:
        return ret;
+}
 
-} /* end user_instantiate() */
 EXPORT_SYMBOL_GPL(user_instantiate);
 
-/*****************************************************************************/
-/*
- * dispose of the old data from an updated user defined key
- */
-static void user_update_rcu_disposal(struct rcu_head *rcu)
-{
-       struct user_key_payload *upayload;
-
-       upayload = container_of(rcu, struct user_key_payload, rcu);
-
-       kfree(upayload);
-
-} /* end user_update_rcu_disposal() */
-
-/*****************************************************************************/
 /*
  * update a user defined key
  * - the key's semaphore is write-locked
@@ -118,42 +102,55 @@ int user_update(struct key *key, const void *data, size_t datalen)
                key->expiry = 0;
        }
 
-       call_rcu(&zap->rcu, user_update_rcu_disposal);
+       kfree_rcu(zap, rcu);
 
 error:
        return ret;
-
-} /* end user_update() */
+}
 
 EXPORT_SYMBOL_GPL(user_update);
 
-/*****************************************************************************/
 /*
  * match users on their name
  */
 int user_match(const struct key *key, const void *description)
 {
        return strcmp(key->description, description) == 0;
-
-} /* end user_match() */
+}
 
 EXPORT_SYMBOL_GPL(user_match);
 
-/*****************************************************************************/
 /*
- * dispose of the data dangling from the corpse of a user
+ * dispose of the links from a revoked keyring
+ * - called with the key sem write-locked
+ */
+void user_revoke(struct key *key)
+{
+       struct user_key_payload *upayload = key->payload.data;
+
+       /* clear the quota */
+       key_payload_reserve(key, 0);
+
+       if (upayload) {
+               rcu_assign_pointer(key->payload.data, NULL);
+               kfree_rcu(upayload, rcu);
+       }
+}
+
+EXPORT_SYMBOL(user_revoke);
+
+/*
+ * dispose of the data dangling from the corpse of a user key
  */
 void user_destroy(struct key *key)
 {
        struct user_key_payload *upayload = key->payload.data;
 
        kfree(upayload);
-
-} /* end user_destroy() */
+}
 
 EXPORT_SYMBOL_GPL(user_destroy);
 
-/*****************************************************************************/
 /*
  * describe the user key
  */
@@ -162,12 +159,10 @@ void user_describe(const struct key *key, struct seq_file *m)
        seq_puts(m, key->description);
 
        seq_printf(m, ": %u", key->datalen);
-
-} /* end user_describe() */
+}
 
 EXPORT_SYMBOL_GPL(user_describe);
 
-/*****************************************************************************/
 /*
  * read the key data
  * - the key's semaphore is read-locked
@@ -177,7 +172,7 @@ long user_read(const struct key *key, char __user *buffer, size_t buflen)
        struct user_key_payload *upayload;
        long ret;
 
-       upayload = rcu_dereference(key->payload.data);
+       upayload = rcu_dereference_key(key);
        ret = upayload->datalen;
 
        /* we can return the data as is */
@@ -190,7 +185,6 @@ long user_read(const struct key *key, char __user *buffer, size_t buflen)
        }
 
        return ret;
-
-} /* end user_read() */
+}
 
 EXPORT_SYMBOL_GPL(user_read);