md: Convert timers to use timer_setup()

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.

Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: dm-devel@redhat.com
Cc: linux-bcache@vger.kernel.org
Cc: linux-raid@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/bcache/stats.c

@@ -147,9 +147,9 @@ 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);		\
@@ -234,9 +234,7 @@ 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);
 }

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 @@ out:
 		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);

drivers/md/dm-integrity.c

@@ -1094,9 +1094,9 @@ 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);
@@ -2942,7 +2942,7 @@ 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)) {

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);
 

drivers/md/md.c

@@ -541,7 +541,7 @@ 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)
 {
@@ -550,8 +550,7 @@ 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);
@@ -5404,9 +5403,9 @@ 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)