From: Christian Brauner <christian.brauner@ubuntu.com>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: viro@zeniv.linux.org.uk, adobriyan@gmail.com,
davem@davemloft.net, ebiederm@xmission.com,
akpm@linux-foundation.org, areber@redhat.com, serge@hallyn.com,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 08/23] time: Use generic ns_common::count
Date: Thu, 30 Jul 2020 16:52:16 +0200 [thread overview]
Message-ID: <20200730145216.ob5cld7rfgqpynx4@wittgenstein> (raw)
In-Reply-To: <159611040338.535980.6847379168016198580.stgit@localhost.localdomain>
On Thu, Jul 30, 2020 at 03:00:03PM +0300, Kirill Tkhai wrote:
> Convert time namespace to use generic counter.
>
> Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> ---
Looks good!
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
> include/linux/time_namespace.h | 9 ++++-----
> kernel/time/namespace.c | 9 +++------
> 2 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h
> index 5b6031385db0..a51ffc089219 100644
> --- a/include/linux/time_namespace.h
> +++ b/include/linux/time_namespace.h
> @@ -4,7 +4,6 @@
>
>
> #include <linux/sched.h>
> -#include <linux/kref.h>
> #include <linux/nsproxy.h>
> #include <linux/ns_common.h>
> #include <linux/err.h>
> @@ -18,7 +17,6 @@ struct timens_offsets {
> };
>
> struct time_namespace {
> - struct kref kref;
> struct user_namespace *user_ns;
> struct ucounts *ucounts;
> struct ns_common ns;
> @@ -37,20 +35,21 @@ extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns);
>
> static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
> {
> - kref_get(&ns->kref);
> + refcount_inc(&ns->ns.count);
> return ns;
> }
>
> struct time_namespace *copy_time_ns(unsigned long flags,
> struct user_namespace *user_ns,
> struct time_namespace *old_ns);
> -void free_time_ns(struct kref *kref);
> +void free_time_ns(struct time_namespace *ns);
> int timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);
> struct vdso_data *arch_get_vdso_data(void *vvar_page);
>
> static inline void put_time_ns(struct time_namespace *ns)
> {
> - kref_put(&ns->kref, free_time_ns);
> + if (refcount_dec_and_test(&ns->ns.count))
> + free_time_ns(ns);
> }
>
> void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m);
> diff --git a/kernel/time/namespace.c b/kernel/time/namespace.c
> index afc65e6be33e..c4c829eb3511 100644
> --- a/kernel/time/namespace.c
> +++ b/kernel/time/namespace.c
> @@ -92,7 +92,7 @@ static struct time_namespace *clone_time_ns(struct user_namespace *user_ns,
> if (!ns)
> goto fail_dec;
>
> - kref_init(&ns->kref);
> + refcount_set(&ns->ns.count, 1);
>
> ns->vvar_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
> if (!ns->vvar_page)
> @@ -226,11 +226,8 @@ static void timens_set_vvar_page(struct task_struct *task,
> mutex_unlock(&offset_lock);
> }
>
> -void free_time_ns(struct kref *kref)
> +void free_time_ns(struct time_namespace *ns)
> {
> - struct time_namespace *ns;
> -
> - ns = container_of(kref, struct time_namespace, kref);
> dec_time_namespaces(ns->ucounts);
> put_user_ns(ns->user_ns);
> ns_free_inum(&ns->ns);
> @@ -464,7 +461,7 @@ const struct proc_ns_operations timens_for_children_operations = {
> };
>
> struct time_namespace init_time_ns = {
> - .kref = KREF_INIT(3),
> + .ns.count = REFCOUNT_INIT(3),
> .user_ns = &init_user_ns,
> .ns.inum = PROC_TIME_INIT_INO,
> .ns.ops = &timens_operations,
>
>
next prev parent reply other threads:[~2020-07-30 14:52 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 11:59 [PATCH 00/23] proc: Introduce /proc/namespaces/ directory to expose namespaces lineary Kirill Tkhai
2020-07-30 11:59 ` [PATCH 01/23] ns: Add common refcount into ns_common add use it as counter for net_ns Kirill Tkhai
2020-07-30 13:35 ` Christian Brauner
2020-07-30 14:07 ` Kirill Tkhai
2020-07-30 15:59 ` Christian Brauner
2020-07-30 14:30 ` Christian Brauner
2020-07-30 14:34 ` Kirill Tkhai
2020-07-30 14:39 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 02/23] uts: Use generic ns_common::count Kirill Tkhai
2020-07-30 14:30 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 03/23] ipc: " Kirill Tkhai
2020-07-30 14:32 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 04/23] pid: " Kirill Tkhai
2020-07-30 14:37 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 05/23] user: " Kirill Tkhai
2020-07-30 14:46 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 06/23] mnt: " Kirill Tkhai
2020-07-30 14:49 ` Christian Brauner
2020-07-30 11:59 ` [PATCH 07/23] cgroup: " Kirill Tkhai
2020-07-30 14:50 ` Christian Brauner
2020-07-30 12:00 ` [PATCH 08/23] time: " Kirill Tkhai
2020-07-30 14:52 ` Christian Brauner [this message]
2020-07-30 12:00 ` [PATCH 09/23] ns: Introduce ns_idr to be able to iterate all allocated namespaces in the system Kirill Tkhai
2020-07-30 12:23 ` Matthew Wilcox
2020-07-30 13:32 ` Kirill Tkhai
2020-07-30 13:56 ` Matthew Wilcox
2020-07-30 14:12 ` Kirill Tkhai
2020-07-30 14:15 ` Matthew Wilcox
2020-07-30 14:20 ` Kirill Tkhai
2020-07-30 12:00 ` [PATCH 10/23] fs: Rename fs/proc/namespaces.c into fs/proc/task_namespaces.c Kirill Tkhai
2020-07-30 12:00 ` [PATCH 11/23] fs: Add /proc/namespaces/ directory Kirill Tkhai
2020-07-30 12:18 ` Alexey Dobriyan
2020-07-30 13:22 ` Kirill Tkhai
2020-07-30 13:26 ` Christian Brauner
2020-07-30 14:30 ` Kirill Tkhai
2020-07-30 20:47 ` kernel test robot
2020-07-30 22:20 ` kernel test robot
2020-08-05 8:17 ` kernel test robot
2020-08-05 8:17 ` [RFC PATCH] fs: namespaces_dentry_operations can be static kernel test robot
2020-07-30 12:00 ` [PATCH 12/23] user: Free user_ns one RCU grace period after final counter put Kirill Tkhai
2020-07-30 12:00 ` [PATCH 13/23] user: Add user namespaces into ns_idr Kirill Tkhai
2020-07-30 12:00 ` [PATCH 14/23] net: Add net " Kirill Tkhai
2020-07-30 12:00 ` [PATCH 15/23] pid: Eextract child_reaper check from pidns_for_children_get() Kirill Tkhai
2020-07-30 12:00 ` [PATCH 16/23] proc_ns_operations: Add can_get method Kirill Tkhai
2020-07-30 12:00 ` [PATCH 17/23] pid: Add pid namespaces into ns_idr Kirill Tkhai
2020-07-30 12:00 ` [PATCH 18/23] uts: Free uts namespace one RCU grace period after final counter put Kirill Tkhai
2020-07-30 12:01 ` [PATCH 19/23] uts: Add uts namespaces into ns_idr Kirill Tkhai
2020-07-30 12:01 ` [PATCH 20/23] ipc: Add ipc " Kirill Tkhai
2020-07-30 12:01 ` [PATCH 21/23] mnt: Add mount " Kirill Tkhai
2020-07-30 12:01 ` [PATCH 22/23] cgroup: Add cgroup " Kirill Tkhai
2020-07-30 12:01 ` [PATCH 23/23] time: Add time " Kirill Tkhai
2020-07-30 13:08 ` [PATCH 00/23] proc: Introduce /proc/namespaces/ directory to expose namespaces lineary Christian Brauner
2020-07-30 13:38 ` Christian Brauner
2020-07-30 14:34 ` Eric W. Biederman
2020-07-30 14:42 ` Christian Brauner
2020-07-30 15:01 ` Kirill Tkhai
2020-07-30 22:13 ` Eric W. Biederman
2020-07-31 8:48 ` Pavel Tikhomirov
2020-08-03 10:03 ` Kirill Tkhai
2020-08-03 10:51 ` Alexey Dobriyan
2020-08-06 8:05 ` Andrei Vagin
2020-08-07 8:47 ` Kirill Tkhai
2020-08-10 17:34 ` Andrei Vagin
2020-08-11 10:23 ` Kirill Tkhai
2020-08-12 17:53 ` Andrei Vagin
2020-08-13 8:12 ` Kirill Tkhai
2020-08-14 1:16 ` Andrei Vagin
2020-08-14 15:11 ` Kirill Tkhai
2020-08-14 19:21 ` Andrei Vagin
2020-08-17 14:05 ` Kirill Tkhai
2020-08-17 15:48 ` Eric W. Biederman
2020-08-17 17:47 ` Christian Brauner
2020-08-17 18:53 ` Eric W. Biederman
2020-08-04 5:43 ` Andrei Vagin
2020-08-04 12:11 ` Pavel Tikhomirov
2020-08-04 14:47 ` Kirill Tkhai
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