linux-kernel - Re: [PATCH 07/38] pidns 1/2: make create_pid

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Message-ID: <20090522092025.GD22601@cr0.nay.redhat.com>
Date:	Fri, 22 May 2009 17:20:25 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	torvalds@...ux-foundation.org, xemul@...allels.com,
	orenl@...columbia.edu, serue@...ibm.com, dave@...ux.vnet.ibm.com,
	mingo@...e.hu
Subject: Re: [PATCH 07/38] pidns 1/2: make create_pid_namespace() accept
	parent pidns

On Fri, May 22, 2009 at 08:55:01AM +0400, Alexey Dobriyan wrote:
>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>

Nice cleanup!

Reviewed-by: WANG Cong <xiyou.wangcong@...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);
>-- 
>1.5.6.5
>
>--
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