[PATCH] namespaces: utsname: implement utsname namespaces

This patch defines the uts namespace and some manipulators.
Adds the uts namespace to task_struct, and initializes a
system-wide init namespace.

It leaves a #define for system_utsname so sysctl will compile.
This define will be removed in a separate patch.

[akpm@osdl.org: build fix, cleanup]
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Andrey Savochkin <saw@sw.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index e10385c17f73..47c19280c55b 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -14,6 +14,7 @@
 #include <linux/nsproxy.h>
 #include <linux/init_task.h>
 #include <linux/namespace.h>
+#include <linux/utsname.h>
 
 struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
 
@@ -59,6 +60,8 @@ struct nsproxy *dup_namespaces(struct nsproxy *orig)
         if (ns) {
                 if (ns->namespace)
                         get_namespace(ns->namespace);
+                if (ns->uts_ns)
+                        get_uts_ns(ns->uts_ns);
         }
 
         return ns;
@@ -97,6 +100,15 @@ int copy_namespaces(int flags, struct task_struct *tsk)
                 goto out;
         }
 
+        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;
+        }
+
 out:
         put_nsproxy(old_ns);
         return err;
@@ -106,5 +118,7 @@ void free_nsproxy(struct nsproxy *ns)
 {
                 if (ns->namespace)
                         put_namespace(ns->namespace);
+                if (ns->uts_ns)
+                        put_uts_ns(ns->uts_ns);
                 kfree(ns);
 }