CRED: Detach the credentials from task_struct

[linux-2.6-omap-h63xx.git] / include / linux / cred.h

diff --git a/include/linux/cred.h b/include/linux/cred.h
index 3e65587a72e5e00e6ed7d1145069f3762da81946..a7a686074cb050c14507f087be0619a0ca6c9f97 100644 (file)
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -158,4 +158,33 @@ do {                                               \
        *(_gid) = current->cred->fsgid;         \
 } while(0)
 
+extern void __put_cred(struct cred *);
+extern int copy_creds(struct task_struct *, unsigned long);
+
+/**
+ * get_cred - Get a reference on a set of credentials
+ * @cred: The credentials to reference
+ *
+ * Get a reference on the specified set of credentials.  The caller must
+ * release the reference.
+ */
+static inline struct cred *get_cred(struct cred *cred)
+{
+       atomic_inc(&cred->usage);
+       return cred;
+}
+
+/**
+ * put_cred - Release a reference to a set of credentials
+ * @cred: The credentials to release
+ *
+ * Release a reference to a set of credentials, deleting them when the last ref
+ * is released.
+ */
+static inline void put_cred(struct cred *cred)
+{
+       if (atomic_dec_and_test(&(cred)->usage))
+               __put_cred(cred);
+}
+
 #endif /* _LINUX_CRED_H */