1 files changed, 86 insertions, 0 deletions
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
new file mode 100644
index 00000000..38d10326
--- /dev/null
+++ b/include/linux/pid_namespace.h
@@ -0,0 +1,86 @@
+#ifndef _LINUX_PID_NS_H
+#define _LINUX_PID_NS_H
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/threads.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 bsd_acct_struct;
+
+struct pid_namespace {
+	struct kref kref;
+	struct pidmap pidmap[PIDMAP_ENTRIES];
+	int last_pid;
+	struct task_struct *child_reaper;
+	struct kmem_cache *pid_cachep;
+	unsigned int level;
+	struct pid_namespace *parent;
+#ifdef CONFIG_PROC_FS
+	struct vfsmount *proc_mnt;
+#endif
+#ifdef CONFIG_BSD_PROCESS_ACCT
+	struct bsd_acct_struct *bacct;
+#endif
+};
+
+extern struct pid_namespace init_pid_ns;
+
+#ifdef CONFIG_PID_NS
+static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
+{
+	if (ns != &init_pid_ns)
+		kref_get(&ns->kref);
+	return ns;
+}
+
+extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
+extern void free_pid_ns(struct kref *kref);
+extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
+
+static inline void put_pid_ns(struct pid_namespace *ns)
+{
+	if (ns != &init_pid_ns)
+		kref_put(&ns->kref, free_pid_ns);
+}
+
+#else /* !CONFIG_PID_NS */
+#include <linux/err.h>
+
+static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
+{
+	return ns;
+}
+
+static inline struct pid_namespace *
+copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
+{
+	if (flags & CLONE_NEWPID)
+		ns = ERR_PTR(-EINVAL);
+	return ns;
+}
+
+static inline void put_pid_ns(struct pid_namespace *ns)
+{
+}
+
+
+static inline void zap_pid_ns_processes(struct pid_namespace *ns)
+{
+	BUG();
+}
+#endif /* CONFIG_PID_NS */
+
+extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
+void pidhash_init(void);
+void pidmap_init(void);
+
+#endif /* _LINUX_PID_NS_H */