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>

1 files changed, 11 insertions, 9 deletions

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 6fc53242406..e4e18c509ac 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -15,9 +15,11 @@
 
 #ifdef CONFIG_BLOCK
 
-#define kobj_to_dev(k) container_of(k, struct device, kobj)
-#define dev_to_disk(device) container_of(device, struct gendisk, dev)
-#define dev_to_part(device) container_of(device, struct hd_struct, dev)
+#define kobj_to_dev(k)          container_of((k), struct device, kobj)
+#define dev_to_disk(device)     container_of((device), struct gendisk, __dev)
+#define dev_to_part(device)     container_of((device), struct hd_struct, __dev)
+#define disk_to_dev(disk)       (&((disk)->__dev))
+#define part_to_dev(part)       (&((part)->__dev))
 
 extern struct device_type part_type;
 extern struct kobject *block_depr;
@@ -88,7 +90,7 @@ struct disk_stats {
 struct hd_struct {
         sector_t start_sect;
         sector_t nr_sects;
-        struct device dev;
+        struct device __dev;
         struct kobject *holder_dir;
         int policy, partno;
 #ifdef CONFIG_FAIL_MAKE_REQUEST
@@ -139,7 +141,7 @@ struct gendisk {
 
         int flags;
         struct device *driverfs_dev;  // FIXME: remove
-        struct device dev;
+        struct device __dev;
         struct kobject *holder_dir;
         struct kobject *slave_dir;
 
@@ -163,7 +165,7 @@ struct gendisk {
 static inline struct gendisk *part_to_disk(struct hd_struct *part)
 {
         if (likely(part))
-                return dev_to_disk((part)->dev.parent);
+                return dev_to_disk(part_to_dev(part)->parent);
         return NULL;
 }
 
@@ -174,12 +176,12 @@ static inline int disk_max_parts(struct gendisk *disk)
 
 static inline dev_t disk_devt(struct gendisk *disk)
 {
-        return disk->dev.devt;
+        return disk_to_dev(disk)->devt;
 }
 
 static inline dev_t part_devt(struct hd_struct *part)
 {
-        return part->dev.devt;
+        return part_to_dev(part)->devt;
 }
 
 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
@@ -187,7 +189,7 @@ extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
 static inline void disk_put_part(struct hd_struct *part)
 {
         if (likely(part))
-                put_device(&part->dev);
+                put_device(part_to_dev(part));
 }
 
 /*