[PATCH 05/30] nsproxy: add create_nsproxy()

From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org, containers@lists.linux-foundation.org
Cc: xemul@parallels.com, serue@us.ibm.com, dave@linux.vnet.ibm.com,
	mingo@elte.hu, orenl@cs.columbia.edu, hch@infradead.org,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: [PATCH 05/30] nsproxy: add create_nsproxy()
Date: Fri, 10 Apr 2009 06:34:13 +0400	[thread overview]
Message-ID: <20090410023413.GF27788@x200.localdomain> (raw)

clone_nsproxy() does useless copying of old nsproxy -- every pointer
will be rewritten to new ns or to old ns.

Remove copying, rename clone_nsproxy(), it will be used by C/R code
to create fresh nsproxy on restart.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 kernel/nsproxy.c |   19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -26,19 +26,14 @@ static struct kmem_cache *nsproxy_cachep;
 
 struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
 
-/*
- * creates a copy of "orig" with refcount 1.
- */
-static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig)
+static inline struct nsproxy *create_nsproxy(void)
 {
-	struct nsproxy *ns;
+	struct nsproxy *nsproxy;
 
-	ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
-	if (ns) {
-		memcpy(ns, orig, sizeof(struct nsproxy));
-		atomic_set(&ns->count, 1);
-	}
-	return ns;
+	nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
+	if (nsproxy)
+		atomic_set(&nsproxy->count, 1);
+	return nsproxy;
 }
 
 /*
@@ -52,7 +47,7 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
 	struct nsproxy *new_nsp;
 	int err;
 
-	new_nsp = clone_nsproxy(tsk->nsproxy);
+	new_nsp = create_nsproxy();
 	if (!new_nsp)
 		return ERR_PTR(-ENOMEM);
 
