1 files changed, 86 insertions, 0 deletions

diff --git a/ipc/namespace.c b/ipc/namespace.c
new file mode 100644
index 000000000000..1b967655eb35
--- /dev/null
+++ b/ipc/namespace.c
@@ -0,0 +1,86 @@
+/*
+ * linux/ipc/namespace.c
+ * Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.
+ */
+
+#include <linux/ipc.h>
+#include <linux/msg.h>
+#include <linux/ipc_namespace.h>
+#include <linux/rcupdate.h>
+#include <linux/nsproxy.h>
+#include <linux/slab.h>
+
+#include "util.h"
+
+static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
+{
+        struct ipc_namespace *ns;
+
+        ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
+        if (ns == NULL)
+                return ERR_PTR(-ENOMEM);
+
+        sem_init_ns(ns);
+        msg_init_ns(ns);
+        shm_init_ns(ns);
+
+        kref_init(&ns->kref);
+        return ns;
+}
+
+struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
+{
+        struct ipc_namespace *new_ns;
+
+        BUG_ON(!ns);
+        get_ipc_ns(ns);
+
+        if (!(flags & CLONE_NEWIPC))
+                return ns;
+
+        new_ns = clone_ipc_ns(ns);
+
+        put_ipc_ns(ns);
+        return new_ns;
+}
+
+/*
+ * free_ipcs - free all ipcs of one type
+ * @ns:   the namespace to remove the ipcs from
+ * @ids:  the table of ipcs to free
+ * @free: the function called to free each individual ipc
+ *
+ * Called for each kind of ipc when an ipc_namespace exits.
+ */
+void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
+               void (*free)(struct ipc_namespace *, struct kern_ipc_perm *))
+{
+        struct kern_ipc_perm *perm;
+        int next_id;
+        int total, in_use;
+
+        down_write(&ids->rw_mutex);
+
+        in_use = ids->in_use;
+
+        for (total = 0, next_id = 0; total < in_use; next_id++) {
+                perm = idr_find(&ids->ipcs_idr, next_id);
+                if (perm == NULL)
+                        continue;
+                ipc_lock_by_ptr(perm);
+                free(ns, perm);
+                total++;
+        }
+        up_write(&ids->rw_mutex);
+}
+
+void free_ipc_ns(struct kref *kref)
+{
+        struct ipc_namespace *ns;
+
+        ns = container_of(kref, struct ipc_namespace, kref);
+        sem_exit_ns(ns);
+        msg_exit_ns(ns);
+        shm_exit_ns(ns);
+        kfree(ns);
+}