linux-kernel - RE: [PATCH RESEND] nsproxy: Reuse already available put

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Date:   Mon, 20 Feb 2017 19:29:06 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Parav Pandit <parav@...lanox.com>,
        "ebiederm@...ssion.com" <ebiederm@...ssion.com>,
        "adityakali@...gle.com" <adityakali@...gle.com>,
        "tj@...nel.org" <tj@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RESEND] nsproxy: Reuse already available put_nsproxy
 helper function.

Hi Eric,

Will you be able to merge this patch if it looks o.k.

Parav

> -----Original Message-----
> From: Parav Pandit [mailto:parav@...lanox.com]
> Sent: Friday, January 27, 2017 1:39 PM
> To: ebiederm@...ssion.com; adityakali@...gle.com; tj@...nel.org; linux-
> kernel@...r.kernel.org
> Cc: Parav Pandit <parav@...lanox.com>
> Subject: [PATCH RESEND] nsproxy: Reuse already available put_nsproxy
> helper function.
> 
> This patch makes use of already available put_nsproxy() helper function
> which already perform atomic check and conditional free.
> It also remove braces in put_nsproxy() for single line conditional statement.
> Minor fixes for trailing white space, 80 characters etc warnings reported by
> checkpatch.pl.
> 
> Resending it to include Eric Biederman to merge the changes.
> 
> Signed-off-by: Parav Pandit <parav@...lanox.com>
> ---
>  include/linux/nsproxy.h | 10 +++++-----
>  kernel/nsproxy.c        | 12 +++++++-----
>  2 files changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h index
> ac0d65b..24556f4 100644
> --- a/include/linux/nsproxy.h
> +++ b/include/linux/nsproxy.h
> @@ -33,7 +33,7 @@ struct nsproxy {
>  	struct ipc_namespace *ipc_ns;
>  	struct mnt_namespace *mnt_ns;
>  	struct pid_namespace *pid_ns_for_children;
> -	struct net 	     *net_ns;
> +	struct net	     *net_ns;
>  	struct cgroup_namespace *cgroup_ns;
>  };
>  extern struct nsproxy init_nsproxy;
> @@ -68,15 +68,15 @@ struct nsproxy {
>  void exit_task_namespaces(struct task_struct *tsk);  void
> switch_task_namespaces(struct task_struct *tsk, struct nsproxy *new);  void
> free_nsproxy(struct nsproxy *ns); -int
> unshare_nsproxy_namespaces(unsigned long, struct nsproxy **,
> -	struct cred *, struct fs_struct *);
> +int unshare_nsproxy_namespaces(unsigned long unshare_flags,
> +	struct nsproxy **new_nsp, struct cred *new_cred,
> +	struct fs_struct *new_fs);
>  int __init nsproxy_cache_init(void);
> 
>  static inline void put_nsproxy(struct nsproxy *ns)  {
> -	if (atomic_dec_and_test(&ns->count)) {
> +	if (atomic_dec_and_test(&ns->count))
>  		free_nsproxy(ns);
> -	}
>  }
> 
>  static inline void get_nsproxy(struct nsproxy *ns) diff --git
> a/kernel/nsproxy.c b/kernel/nsproxy.c index 782102e..f253655 100644
> --- a/kernel/nsproxy.c
> +++ b/kernel/nsproxy.c
> @@ -71,7 +71,8 @@ static struct nsproxy
> *create_new_namespaces(unsigned long flags,
>  	if (!new_nsp)
>  		return ERR_PTR(-ENOMEM);
> 
> -	new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns,
> user_ns, new_fs);
> +	new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns,
> user_ns,
> +				      new_fs);
>  	if (IS_ERR(new_nsp->mnt_ns)) {
>  		err = PTR_ERR(new_nsp->mnt_ns);
>  		goto out_ns;
> @@ -158,7 +159,7 @@ int copy_namespaces(unsigned long flags, struct
> task_struct *tsk)
>  	 * it along with CLONE_NEWIPC.
>  	 */
>  	if ((flags & (CLONE_NEWIPC | CLONE_SYSVSEM)) ==
> -		(CLONE_NEWIPC | CLONE_SYSVSEM))
> +		(CLONE_NEWIPC | CLONE_SYSVSEM))
>  		return -EINVAL;
> 
>  	new_ns = create_new_namespaces(flags, tsk, user_ns, tsk->fs); @@
> -189,7 +190,8 @@ void free_nsproxy(struct nsproxy *ns)
>   * On success, returns the new nsproxy.
>   */
>  int unshare_nsproxy_namespaces(unsigned long unshare_flags,
> -	struct nsproxy **new_nsp, struct cred *new_cred, struct fs_struct
> *new_fs)
> +	struct nsproxy **new_nsp, struct cred *new_cred,
> +	struct fs_struct *new_fs)
>  {
>  	struct user_namespace *user_ns;
>  	int err = 0;
> @@ -224,8 +226,8 @@ void switch_task_namespaces(struct task_struct *p,
> struct nsproxy *new)
>  	p->nsproxy = new;
>  	task_unlock(p);
> 
> -	if (ns && atomic_dec_and_test(&ns->count))
> -		free_nsproxy(ns);
> +	if (ns)
> +		put_nsproxy(ns);
>  }
> 
>  void exit_task_namespaces(struct task_struct *p)
> --
> 1.8.3.1