linux-kernel - [PATCH 1/2] pidns 1/2: make create_pid

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Date:	Mon, 4 May 2009 03:27:00 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, xemul@...allels.com
Subject: [PATCH 1/2] pidns 1/2: make create_pid_namespace() accept parent
	pidns

create_pid_namespace() creates everything, but caller has to assign parent
pidns by hand, which is unnatural. At the moment of call new ->level has
to be taken from somewhere and parent pidns is already available.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
 kernel/pid_namespace.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 2d1001b..495d5de 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -67,9 +67,10 @@ err_alloc:
 	return NULL;
 }
 
-static struct pid_namespace *create_pid_namespace(unsigned int level)
+static struct pid_namespace *create_pid_namespace(struct pid_namespace *parent_pid_ns)
 {
 	struct pid_namespace *ns;
+	unsigned int level = parent_pid_ns->level + 1;
 	int i;
 
 	ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL);
@@ -86,6 +87,7 @@ static struct pid_namespace *create_pid_namespace(unsigned int level)
 
 	kref_init(&ns->kref);
 	ns->level = level;
+	ns->parent = get_pid_ns(parent_pid_ns);
 
 	set_bit(0, ns->pidmap[0].page);
 	atomic_set(&ns->pidmap[0].nr_free, BITS_PER_PAGE - 1);
@@ -125,9 +127,7 @@ struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old
 	if (flags & CLONE_THREAD)
 		goto out_put;
 
-	new_ns = create_pid_namespace(old_ns->level + 1);
-	if (!IS_ERR(new_ns))
-		new_ns->parent = get_pid_ns(old_ns);
+	new_ns = create_pid_namespace(old_ns);
 
 out_put:
 	put_pid_ns(old_ns);
--
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