linux-kernel - Re: [PATCH] fs/nilfs2: Convert timers to use timer

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Date:   Sat, 4 Nov 2017 03:00:46 +0900
From:   Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>
Cc:     linux-nilfs <linux-nilfs@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs/nilfs2: Convert timers to use timer_setup()

2017-10-17 8:59 GMT+09:00 Kees Cook <keescook@...omium.org>:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly. This requires adding a pointer to
> hold the timer's target task, as the lifetime of sc_task doesn't appear to
> match the timer's task.
>
> Cc: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
> Cc: linux-nilfs@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Looks good.

Acked-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>

Thanks,
Ryusuke Konishi

> ---
>  fs/nilfs2/segment.c | 11 +++++------
>  fs/nilfs2/segment.h |  1 +
>  2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
> index 70ded52dc1dd..07b6154a081e 100644
> --- a/fs/nilfs2/segment.c
> +++ b/fs/nilfs2/segment.c
> @@ -2404,11 +2404,11 @@ static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
>         return err;
>  }
>
> -static void nilfs_construction_timeout(unsigned long data)
> +static void nilfs_construction_timeout(struct timer_list *t)
>  {
> -       struct task_struct *p = (struct task_struct *)data;
> +       struct nilfs_sc_info *sci = from_timer(sci, t, sc_timer);
>
> -       wake_up_process(p);
> +       wake_up_process(sci->sc_timer_task);
>  }
>
>  static void
> @@ -2546,8 +2546,7 @@ static int nilfs_segctor_thread(void *arg)
>         struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
>         int timeout = 0;
>
> -       sci->sc_timer.data = (unsigned long)current;
> -       sci->sc_timer.function = nilfs_construction_timeout;
> +       sci->sc_timer_task = current;
>
>         /* start sync. */
>         sci->sc_task = current;
> @@ -2678,7 +2677,7 @@ static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
>         INIT_LIST_HEAD(&sci->sc_gc_inodes);
>         INIT_LIST_HEAD(&sci->sc_iput_queue);
>         INIT_WORK(&sci->sc_iput_work, nilfs_iput_work_func);
> -       init_timer(&sci->sc_timer);
> +       timer_setup(&sci->sc_timer, nilfs_construction_timeout, 0);
>
>         sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
>         sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
> diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
> index 1060949d7dd2..84084a4d9b3e 100644
> --- a/fs/nilfs2/segment.h
> +++ b/fs/nilfs2/segment.h
> @@ -180,6 +180,7 @@ struct nilfs_sc_info {
>         unsigned long           sc_watermark;
>
>         struct timer_list       sc_timer;
> +       struct task_struct     *sc_timer_task;
>         struct task_struct     *sc_task;
>  };
>
> --
> 2.7.4
>
>
> --
> Kees Cook
> Pixel Security