[PATCH] IPC namespace core

This patch set allows to unshare IPCs and have a private set of IPC objects
(sem, shm, msg) inside namespace.  Basically, it is another building block of
containers functionality.

This patch implements core IPC namespace changes:
- ipc_namespace structure
- new config option CONFIG_IPC_NS
- adds CLONE_NEWIPC flag
- unshare support

[clg@fr.ibm.com: small fix for unshare of ipc namespace]
[akpm@osdl.org: build fix]
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 28 insertions, 13 deletions

diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 8246813335cc..8d6c852dc51e 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -7,6 +7,10 @@
  *  modify it under the terms of the GNU General Public License as
  *  published by the Free Software Foundation, version 2 of the
  *  License.
+ *
+ *  Jun 2006 - namespaces support
+ *             OpenVZ, SWsoft Inc.
+ *             Pavel Emelianov <xemul@openvz.org>
  */
 
 #include <linux/module.h>
@@ -62,6 +66,8 @@ struct nsproxy *dup_namespaces(struct nsproxy *orig)
                         get_namespace(ns->namespace);
                 if (ns->uts_ns)
                         get_uts_ns(ns->uts_ns);
+                if (ns->ipc_ns)
+                        get_ipc_ns(ns->ipc_ns);
         }
 
         return ns;
@@ -82,7 +88,7 @@ int copy_namespaces(int flags, struct task_struct *tsk)
 
         get_nsproxy(old_ns);
 
-        if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS)))
+        if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC)))
                 return 0;
 
         new_ns = clone_namespaces(old_ns);
@@ -94,24 +100,31 @@ int copy_namespaces(int flags, struct task_struct *tsk)
         tsk->nsproxy = new_ns;
 
         err = copy_namespace(flags, tsk);
-        if (err) {
-                tsk->nsproxy = old_ns;
-                put_nsproxy(new_ns);
-                goto out;
-        }
+        if (err)
+                goto out_ns;
 
         err = copy_utsname(flags, tsk);
-        if (err) {
-                if (new_ns->namespace)
-                        put_namespace(new_ns->namespace);
-                tsk->nsproxy = old_ns;
-                put_nsproxy(new_ns);
-                goto out;
-        }
+        if (err)
+                goto out_uts;
+
+        err = copy_ipcs(flags, tsk);
+        if (err)
+                goto out_ipc;
 
 out:
         put_nsproxy(old_ns);
         return err;
+
+out_ipc:
+        if (new_ns->uts_ns)
+                put_uts_ns(new_ns->uts_ns);
+out_uts:
+        if (new_ns->namespace)
+                put_namespace(new_ns->namespace);
+out_ns:
+        tsk->nsproxy = old_ns;
+        put_nsproxy(new_ns);
+        goto out;
 }
 
 void free_nsproxy(struct nsproxy *ns)
@@ -120,5 +133,7 @@ void free_nsproxy(struct nsproxy *ns)
                         put_namespace(ns->namespace);
                 if (ns->uts_ns)
                         put_uts_ns(ns->uts_ns);
+                if (ns->ipc_ns)
+                        put_ipc_ns(ns->ipc_ns);
                 kfree(ns);
 }