1 files changed, 45 insertions, 0 deletions

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
new file mode 100644
index 000000000000..d2a9d419f01f
--- /dev/null
+++ b/include/linux/pid_namespace.h
@@ -0,0 +1,45 @@
+#ifndef _LINUX_PID_NS_H
+#define _LINUX_PID_NS_H
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/threads.h>
+#include <linux/pid.h>
+#include <linux/nsproxy.h>
+#include <linux/kref.h>
+
+struct pidmap {
+       atomic_t nr_free;
+       void *page;
+};
+
+#define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
+
+struct pid_namespace {
+        struct kref kref;
+        struct pidmap pidmap[PIDMAP_ENTRIES];
+        int last_pid;
+        struct task_struct *child_reaper;
+};
+
+extern struct pid_namespace init_pid_ns;
+
+static inline void get_pid_ns(struct pid_namespace *ns)
+{
+        kref_get(&ns->kref);
+}
+
+extern int copy_pid_ns(int flags, struct task_struct *tsk);
+extern void free_pid_ns(struct kref *kref);
+
+static inline void put_pid_ns(struct pid_namespace *ns)
+{
+        kref_put(&ns->kref, free_pid_ns);
+}
+
+static inline struct task_struct *child_reaper(struct task_struct *tsk)
+{
+        return tsk->nsproxy->pid_ns->child_reaper;
+}
+
+#endif /* _LINUX_PID_NS_H */