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

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Message-ID: <20090505015827.GA6048@linux.vnet.ibm.com>
Date:	Mon, 4 May 2009 18:58:27 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, xemul@...allels.com
Subject: Re: [PATCH 1/2] pidns 1/2: make create_pid_namespace() accept
	parentpidns

Alexey Dobriyan [adobriyan@...il.com] 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>

Acked-By: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.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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