Re: [PATCH] md: Convert timers to use timer_setup()

[Shaohua Li]

On Mon, Oct 16, 2017 at 05:01:48PM -0700, Kees Cook wrote:
> 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.

If you send the md.c part along, I'll apply. Or if you want this merged in
other tree, you can add my 'reviewed-by: Shaohua Li <shli@xxxxxx>' for md.c
part.

> Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> Cc: Shaohua Li <shli@xxxxxxxxxx>
> Cc: Alasdair Kergon <agk@xxxxxxxxxx>
> Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
> Cc: dm-devel@xxxxxxxxxx
> Cc: linux-bcache@xxxxxxxxxxxxxxx
> Cc: linux-raid@xxxxxxxxxxxxxxx
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---
>  drivers/md/bcache/stats.c | 8 +++-----
>  drivers/md/dm-delay.c     | 6 +++---
>  drivers/md/dm-integrity.c | 6 +++---
>  drivers/md/dm-raid1.c     | 8 +++-----
>  drivers/md/md.c           | 9 ++++-----
>  5 files changed, 16 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/md/bcache/stats.c b/drivers/md/bcache/stats.c
> index 0ca072c20d0d..93a89c528760 100644
> --- a/drivers/md/bcache/stats.c
> +++ b/drivers/md/bcache/stats.c
> @@ -146,9 +146,9 @@ static void scale_stats(struct cache_stats *stats, unsigned long rescale_at)
>  	}
>  }
>  
> -static void scale_accounting(unsigned long data)
> +static void scale_accounting(struct timer_list *t)
>  {
> -	struct cache_accounting *acc = (struct cache_accounting *) data;
> +	struct cache_accounting *acc = from_timer(acc, t, timer);
>  
>  #define move_stat(name) do {						\
>  	unsigned t = atomic_xchg(&acc->collector.name, 0);		\
> @@ -233,9 +233,7 @@ void bch_cache_accounting_init(struct cache_accounting *acc,
>  	kobject_init(&acc->day.kobj,		&bch_stats_ktype);
>  
>  	closure_init(&acc->cl, parent);
> -	init_timer(&acc->timer);
> +	timer_setup(&acc->timer, scale_accounting, 0);
>  	acc->timer.expires	= jiffies + accounting_delay;
> -	acc->timer.data		= (unsigned long) acc;
> -	acc->timer.function	= scale_accounting;
>  	add_timer(&acc->timer);
>  }
> diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
> index 2209a9700acd..288386bfbfb5 100644
> --- a/drivers/md/dm-delay.c
> +++ b/drivers/md/dm-delay.c
> @@ -44,9 +44,9 @@ struct dm_delay_info {
>  
>  static DEFINE_MUTEX(delayed_bios_lock);
>  
> -static void handle_delayed_timer(unsigned long data)
> +static void handle_delayed_timer(struct timer_list *t)
>  {
> -	struct delay_c *dc = (struct delay_c *)data;
> +	struct delay_c *dc = from_timer(dc, t, delay_timer);
>  
>  	queue_work(dc->kdelayd_wq, &dc->flush_expired_bios);
>  }
> @@ -195,7 +195,7 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
>  		goto bad_queue;
>  	}
>  
> -	setup_timer(&dc->delay_timer, handle_delayed_timer, (unsigned long)dc);
> +	timer_setup(&dc->delay_timer, handle_delayed_timer, 0);
>  
>  	INIT_WORK(&dc->flush_expired_bios, flush_expired_bios);
>  	INIT_LIST_HEAD(&dc->delayed_bios);
> diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
> index 096fe9b66c50..98f0b645b839 100644
> --- a/drivers/md/dm-integrity.c
> +++ b/drivers/md/dm-integrity.c
> @@ -1093,9 +1093,9 @@ static void sleep_on_endio_wait(struct dm_integrity_c *ic)
>  	__remove_wait_queue(&ic->endio_wait, &wait);
>  }
>  
> -static void autocommit_fn(unsigned long data)
> +static void autocommit_fn(struct timer_list *t)
>  {
> -	struct dm_integrity_c *ic = (struct dm_integrity_c *)data;
> +	struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
>  
>  	if (likely(!dm_integrity_failed(ic)))
>  		queue_work(ic->commit_wq, &ic->commit_work);
> @@ -2941,7 +2941,7 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
>  
>  	ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
>  	ic->autocommit_msec = sync_msec;
> -	setup_timer(&ic->autocommit_timer, autocommit_fn, (unsigned long)ic);
> +	timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
>  
>  	ic->io = dm_io_client_create();
>  	if (IS_ERR(ic->io)) {
> diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
> index c0b82136b2d1..580c49cc8079 100644
> --- a/drivers/md/dm-raid1.c
> +++ b/drivers/md/dm-raid1.c
> @@ -94,9 +94,9 @@ static void wakeup_mirrord(void *context)
>  	queue_work(ms->kmirrord_wq, &ms->kmirrord_work);
>  }
>  
> -static void delayed_wake_fn(unsigned long data)
> +static void delayed_wake_fn(struct timer_list *t)
>  {
> -	struct mirror_set *ms = (struct mirror_set *) data;
> +	struct mirror_set *ms = from_timer(ms, t, timer);
>  
>  	clear_bit(0, &ms->timer_pending);
>  	wakeup_mirrord(ms);
> @@ -108,8 +108,6 @@ static void delayed_wake(struct mirror_set *ms)
>  		return;
>  
>  	ms->timer.expires = jiffies + HZ / 5;
> -	ms->timer.data = (unsigned long) ms;
> -	ms->timer.function = delayed_wake_fn;
>  	add_timer(&ms->timer);
>  }
>  
> @@ -1133,7 +1131,7 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
>  		goto err_free_context;
>  	}
>  	INIT_WORK(&ms->kmirrord_work, do_mirror);
> -	init_timer(&ms->timer);
> +	timer_setup(&ms->timer, delayed_wake_fn, 0);
>  	ms->timer_pending = 0;
>  	INIT_WORK(&ms->trigger_event, trigger_event);
>  
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 97afb28c6f51..873a20f44197 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -520,7 +520,7 @@ static void mddev_put(struct mddev *mddev)
>  		bioset_free(sync_bs);
>  }
>  
> -static void md_safemode_timeout(unsigned long data);
> +static void md_safemode_timeout(struct timer_list *t);
>  
>  void mddev_init(struct mddev *mddev)
>  {
> @@ -529,8 +529,7 @@ void mddev_init(struct mddev *mddev)
>  	mutex_init(&mddev->bitmap_info.mutex);
>  	INIT_LIST_HEAD(&mddev->disks);
>  	INIT_LIST_HEAD(&mddev->all_mddevs);
> -	setup_timer(&mddev->safemode_timer, md_safemode_timeout,
> -		    (unsigned long) mddev);
> +	timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0);
>  	atomic_set(&mddev->active, 1);
>  	atomic_set(&mddev->openers, 0);
>  	atomic_set(&mddev->active_io, 0);
> @@ -5386,9 +5385,9 @@ static int add_named_array(const char *val, struct kernel_param *kp)
>  	return -EINVAL;
>  }
>  
> -static void md_safemode_timeout(unsigned long data)
> +static void md_safemode_timeout(struct timer_list *t)
>  {
> -	struct mddev *mddev = (struct mddev *) data;
> +	struct mddev *mddev = from_timer(mddev, t, safemode_timer);
>  
>  	mddev->safemode = 1;
>  	if (mddev->external)
> -- 
> 2.7.4
> 
> 
> -- 
> Kees Cook
> Pixel Security
> --
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