[PATCH V5 02/13] namespaces: expose namespace instance serial number in proc_ns_operations

[Serge E. Hallyn]

Quoting Richard Guy Briggs (rgb at redhat.com):
> Expose the namespace instance serial number for each namespace type in the proc
> namespace operations structure to make it available for the proc filesystem.
> 
> Signed-off-by: Richard Guy Briggs <rgb at redhat.com>

Acked-by: Serge Hallyn <serge.hallyn at canonical.com>

> ---
>  fs/namespace.c           |    7 +++++++
>  include/linux/proc_ns.h  |    1 +
>  ipc/namespace.c          |    8 ++++++++
>  kernel/pid_namespace.c   |    7 +++++++
>  kernel/user_namespace.c  |    7 +++++++
>  kernel/utsname.c         |    8 ++++++++
>  net/core/net_namespace.c |    7 +++++++
>  7 files changed, 45 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/namespace.c b/fs/namespace.c
> index 9af49ff..f433f21 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -3028,6 +3028,12 @@ static unsigned int mntns_inum(void *ns)
>  	return mnt_ns->proc_inum;
>  }
>  
> +static long long mntns_snum(void *ns)
> +{
> +	struct mnt_namespace *mnt_ns = ns;
> +	return mnt_ns->serial_num;
> +}
> +
>  const struct proc_ns_operations mntns_operations = {
>  	.name		= "mnt",
>  	.type		= CLONE_NEWNS,
> @@ -3035,4 +3041,5 @@ const struct proc_ns_operations mntns_operations = {
>  	.put		= mntns_put,
>  	.install	= mntns_install,
>  	.inum		= mntns_inum,
> +	.snum		= mntns_snum,
>  };
> diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
> index 34a1e10..aaafe3e 100644
> --- a/include/linux/proc_ns.h
> +++ b/include/linux/proc_ns.h
> @@ -14,6 +14,7 @@ struct proc_ns_operations {
>  	void (*put)(void *ns);
>  	int (*install)(struct nsproxy *nsproxy, void *ns);
>  	unsigned int (*inum)(void *ns);
> +	long long (*snum)(void *ns);
>  };
>  
>  struct proc_ns {
> diff --git a/ipc/namespace.c b/ipc/namespace.c
> index 76dac5c..36ce7ff 100644
> --- a/ipc/namespace.c
> +++ b/ipc/namespace.c
> @@ -191,6 +191,13 @@ static unsigned int ipcns_inum(void *vp)
>  	return ns->proc_inum;
>  }
>  
> +static long long ipcns_snum(void *vp)
> +{
> +	struct ipc_namespace *ns = vp;
> +
> +	return ns->serial_num;
> +}
> +
>  const struct proc_ns_operations ipcns_operations = {
>  	.name		= "ipc",
>  	.type		= CLONE_NEWIPC,
> @@ -198,4 +205,5 @@ const struct proc_ns_operations ipcns_operations = {
>  	.put		= ipcns_put,
>  	.install	= ipcns_install,
>  	.inum		= ipcns_inum,
> +	.snum		= ipcns_snum,
>  };
> diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
> index 40a8b36..059b330 100644
> --- a/kernel/pid_namespace.c
> +++ b/kernel/pid_namespace.c
> @@ -370,6 +370,12 @@ static unsigned int pidns_inum(void *ns)
>  	return pid_ns->proc_inum;
>  }
>  
> +static long long pidns_snum(void *ns)
> +{
> +	struct pid_namespace *pid_ns = ns;
> +	return pid_ns->serial_num;
> +}
> +
>  const struct proc_ns_operations pidns_operations = {
>  	.name		= "pid",
>  	.type		= CLONE_NEWPID,
> @@ -377,6 +383,7 @@ const struct proc_ns_operations pidns_operations = {
>  	.put		= pidns_put,
>  	.install	= pidns_install,
>  	.inum		= pidns_inum,
> +	.snum		= pidns_snum,
>  };
>  
>  static __init int pid_namespaces_init(void)
> diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
> index 5c5c399..3f04df5 100644
> --- a/kernel/user_namespace.c
> +++ b/kernel/user_namespace.c
> @@ -896,6 +896,12 @@ static unsigned int userns_inum(void *ns)
>  	return user_ns->proc_inum;
>  }
>  
> +static long long userns_snum(void *ns)
> +{
> +	struct user_namespace *user_ns = ns;
> +	return user_ns->serial_num;
> +}
> +
>  const struct proc_ns_operations userns_operations = {
>  	.name		= "user",
>  	.type		= CLONE_NEWUSER,
> @@ -903,6 +909,7 @@ const struct proc_ns_operations userns_operations = {
>  	.put		= userns_put,
>  	.install	= userns_install,
>  	.inum		= userns_inum,
> +	.snum		= userns_snum,
>  };
>  
>  static __init int user_namespaces_init(void)
> diff --git a/kernel/utsname.c b/kernel/utsname.c
> index d0cf7b5..ffeac1b 100644
> --- a/kernel/utsname.c
> +++ b/kernel/utsname.c
> @@ -132,6 +132,13 @@ static unsigned int utsns_inum(void *vp)
>  	return ns->proc_inum;
>  }
>  
> +static long long utsns_snum(void *vp)
> +{
> +	struct uts_namespace *ns = vp;
> +
> +	return ns->serial_num;
> +}
> +
>  const struct proc_ns_operations utsns_operations = {
>  	.name		= "uts",
>  	.type		= CLONE_NEWUTS,
> @@ -139,4 +146,5 @@ const struct proc_ns_operations utsns_operations = {
>  	.put		= utsns_put,
>  	.install	= utsns_install,
>  	.inum		= utsns_inum,
> +	.snum		= utsns_snum,
>  };
> diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
> index 3b5cfdb..c402eea 100644
> --- a/net/core/net_namespace.c
> +++ b/net/core/net_namespace.c
> @@ -671,6 +671,12 @@ static unsigned int netns_inum(void *ns)
>  	return net->proc_inum;
>  }
>  
> +static long long netns_snum(void *ns)
> +{
> +	struct net *net = ns;
> +	return net->serial_num;
> +}
> +
>  const struct proc_ns_operations netns_operations = {
>  	.name		= "net",
>  	.type		= CLONE_NEWNET,
> @@ -678,5 +684,6 @@ const struct proc_ns_operations netns_operations = {
>  	.put		= netns_put,
>  	.install	= netns_install,
>  	.inum		= netns_inum,
> +	.snum		= netns_snum,
>  };
>  #endif
> -- 
> 1.7.1