block: implement and use {disk|part}_to_dev()

Implement {disk|part}_to_dev() and use them to access generic device
instead of directly dereferencing {disk|part}->dev.  To make sure no
user is left behind, rename generic devices fields to __dev.

This is in preparation of unifying partition 0 handling with other
partitions.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 7 insertions, 7 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 653624792eaf..637806695bb9 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1186,7 +1186,7 @@ static void event_callback(void *context)
         list_splice_init(&md->uevent_list, &uevents);
         spin_unlock_irqrestore(&md->uevent_lock, flags);
 
-        dm_send_uevents(&uevents, &md->disk->dev.kobj);
+        dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj);
 
         atomic_inc(&md->event_nr);
         wake_up(&md->eventq);
@@ -1643,7 +1643,7 @@ out:
  *---------------------------------------------------------------*/
 void dm_kobject_uevent(struct mapped_device *md)
 {
-        kobject_uevent(&md->disk->dev.kobj, KOBJ_CHANGE);
+        kobject_uevent(&disk_to_dev(md->disk)->kobj, KOBJ_CHANGE);
 }
 
 uint32_t dm_next_uevent_seq(struct mapped_device *md)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index deeac4b44173..96e9fccd2eab 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1465,9 +1465,9 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
                 goto fail;
 
         if (rdev->bdev->bd_part)
-                ko = &rdev->bdev->bd_part->dev.kobj;
+                ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
         else
-                ko = &rdev->bdev->bd_disk->dev.kobj;
+                ko = &disk_to_dev(rdev->bdev->bd_disk)->kobj;
         if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
                 kobject_del(&rdev->kobj);
                 goto fail;
@@ -3470,8 +3470,8 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
         disk->queue = mddev->queue;
         add_disk(disk);
         mddev->gendisk = disk;
-        error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
-                                     "%s", "md");
+        error = kobject_init_and_add(&mddev->kobj, &md_ktype,
+                                     &disk_to_dev(disk)->kobj, "%s", "md");
         mutex_unlock(&disks_mutex);
         if (error)
                 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
@@ -3761,7 +3761,7 @@ static int do_md_run(mddev_t * mddev)
         sysfs_notify(&mddev->kobj, NULL, "array_state");
         sysfs_notify(&mddev->kobj, NULL, "sync_action");
         sysfs_notify(&mddev->kobj, NULL, "degraded");
-        kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
+        kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
         return 0;
 }