[PATCH] IPC namespace - utils
This patch adds basic IPC namespace functionality to
IPC utils:
- init_ipc_ns
- copy/clone/unshare/free IPC ns
- /proc preparations
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index ceecf69..33c5daa 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -6,6 +6,7 @@
#include <linux/irqflags.h>
#include <linux/utsname.h>
#include <linux/lockdep.h>
+#include <linux/ipc.h>
#define INIT_FDTABLE \
{ \
@@ -74,8 +75,8 @@
.count = ATOMIC_INIT(1), \
.nslock = SPIN_LOCK_UNLOCKED, \
.uts_ns = &init_uts_ns, \
- .ipc_ns = &init_ipc_ns, \
.namespace = NULL, \
+ INIT_IPC_NS(ipc_ns) \
}
#define INIT_SIGHAND(sighand) { \
diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index 36027b1..d9e2b3f 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -88,20 +88,38 @@
};
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
+
+#ifdef CONFIG_IPC_NS
extern void free_ipc_ns(struct kref *kref);
extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
+#else
+static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+{
+ return 0;
+}
+#endif
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
{
+#ifdef CONFIG_IPC_NS
if (ns)
kref_get(&ns->kref);
+#endif
return ns;
}
static inline void put_ipc_ns(struct ipc_namespace *ns)
{
+#ifdef CONFIG_IPC_NS
kref_put(&ns->kref, free_ipc_ns);
+#endif
}
#endif /* __KERNEL__ */