1 files changed, 81 insertions, 0 deletions

diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
new file mode 100644
index 000000000000..e4451d1da753
--- /dev/null
+++ b/include/linux/ipc_namespace.h
@@ -0,0 +1,81 @@
+#ifndef __IPC_NAMESPACE_H__
+#define __IPC_NAMESPACE_H__
+
+#include <linux/err.h>
+#include <linux/idr.h>
+#include <linux/rwsem.h>
+
+struct ipc_ids {
+        int in_use;
+        unsigned short seq;
+        unsigned short seq_max;
+        struct rw_semaphore rw_mutex;
+        struct idr ipcs_idr;
+};
+
+struct ipc_namespace {
+        struct kref     kref;
+        struct ipc_ids  ids[3];
+
+        int             sem_ctls[4];
+        int             used_sems;
+
+        int             msg_ctlmax;
+        int             msg_ctlmnb;
+        int             msg_ctlmni;
+        atomic_t        msg_bytes;
+        atomic_t        msg_hdrs;
+
+        size_t          shm_ctlmax;
+        size_t          shm_ctlall;
+        int             shm_ctlmni;
+        int             shm_tot;
+};
+
+extern struct ipc_namespace init_ipc_ns;
+
+#ifdef CONFIG_SYSVIPC
+#define INIT_IPC_NS(ns)         .ns             = &init_ipc_ns,
+#else
+#define INIT_IPC_NS(ns)
+#endif
+
+#if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
+extern void free_ipc_ns(struct kref *kref);
+extern struct ipc_namespace *copy_ipcs(unsigned long flags,
+                                       struct ipc_namespace *ns);
+extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
+                      void (*free)(struct ipc_namespace *,
+                                   struct kern_ipc_perm *));
+
+static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
+{
+        if (ns)
+                kref_get(&ns->kref);
+        return ns;
+}
+
+static inline void put_ipc_ns(struct ipc_namespace *ns)
+{
+        kref_put(&ns->kref, free_ipc_ns);
+}
+#else
+static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
+                struct ipc_namespace *ns)
+{
+        if (flags & CLONE_NEWIPC)
+                return ERR_PTR(-EINVAL);
+
+        return ns;
+}
+
+static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
+{
+        return ns;
+}
+
+static inline void put_ipc_ns(struct ipc_namespace *ns)
+{
+}
+#endif
+#endif