patch-2.4.19 linux-2.4.19/include/linux/namespace.h

• Lines: 43
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/linux/namespace.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/linux/namespace.h linux-2.4.19/include/linux/namespace.h
@@ -0,0 +1,42 @@
+#ifndef _NAMESPACE_H_
+#define _NAMESPACE_H_
+#ifdef __KERNEL__
+
+struct namespace {
+	atomic_t		count;
+	struct vfsmount *	root;
+	struct list_head	list;
+	struct rw_semaphore	sem;
+};
+
+static inline void put_namespace(struct namespace *namespace)
+{
+	if (atomic_dec_and_test(&namespace->count)) {
+		down_write(&namespace->sem);
+		spin_lock(&dcache_lock);
+		umount_tree(namespace->root);
+		spin_unlock(&dcache_lock);
+		up_write(&namespace->sem);
+		kfree(namespace);
+	}
+}
+
+static inline void exit_namespace(struct task_struct *p)
+{
+	struct namespace *namespace = p->namespace;
+	if (namespace) {
+		task_lock(p);
+		p->namespace = NULL;
+		task_unlock(p);
+		put_namespace(namespace);
+	}
+}
+extern int copy_namespace(int, struct task_struct *);
+
+static inline void get_namespace(struct namespace *namespace)
+{
+	atomic_inc(&namespace->count);
+}
+
+#endif
+#endif