1 files changed, 94 insertions, 0 deletions
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
new file mode 100644
index 000000000..07481bb87
--- /dev/null
+++ b/include/linux/pid_namespace.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_PID_NS_H
+#define _LINUX_PID_NS_H
+
+#include <linux/sched.h>
+#include <linux/bug.h>
+#include <linux/mm.h>
+#include <linux/workqueue.h>
+#include <linux/threads.h>
+#include <linux/nsproxy.h>
+#include <linux/ns_common.h>
+#include <linux/idr.h>
+
+/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
+#define MAX_PID_NS_LEVEL 32
+
+struct fs_pin;
+
+struct pid_namespace {
+	struct idr idr;
+	struct rcu_head rcu;
+	unsigned int pid_allocated;
+	struct task_struct *child_reaper;
+	struct kmem_cache *pid_cachep;
+	unsigned int level;
+	struct pid_namespace *parent;
+#ifdef CONFIG_BSD_PROCESS_ACCT
+	struct fs_pin *bacct;
+#endif
+	struct user_namespace *user_ns;
+	struct ucounts *ucounts;
+	int reboot;	/* group exit code if this pidns was rebooted */
+	struct ns_common ns;
+} __randomize_layout;
+
+extern struct pid_namespace init_pid_ns;
+
+#define PIDNS_ADDING (1U << 31)
+
+#ifdef CONFIG_PID_NS
+static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
+{
+	if (ns != &init_pid_ns)
+		refcount_inc(&ns->ns.count);
+	return ns;
+}
+
+extern struct pid_namespace *copy_pid_ns(unsigned long flags,
+	struct user_namespace *user_ns, struct pid_namespace *ns);
+extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
+extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
+extern void put_pid_ns(struct pid_namespace *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 user_namespace *user_ns, 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();
+}
+
+static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
+{
+	return 0;
+}
+#endif /* CONFIG_PID_NS */
+
+extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
+void pidhash_init(void);
+void pid_idr_init(void);
+
+static inline bool task_is_in_init_pid_ns(struct task_struct *tsk)
+{
+	return task_active_pid_ns(tsk) == &init_pid_ns;
+}
+
+#endif /* _LINUX_PID_NS_H */