block: introduce device_add_disk()

In preparation for removing the ->driverfs_dev member of a gendisk, add an api that takes the parent device as a parameter to add_disk(). For now this maintains the status quo of WARN()ing on failure, but not return a error code. Reviewed-by: Christoph Hellwig <[email protected]> Reviewed-by: Johannes Thumshirn <[email protected]> Reviewed-by: Bart Van Assche <[email protected]> Signed-off-by: Dan Williams <[email protected]>
modi0012 · Jun 16, 2016 · e63a46b · e63a46b
1 parent 1b57e66
commit e63a46b
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Showing 2 changed files with 18 additions and 7 deletions.
diff --git a/block/genhd.c b/block/genhd.c
@@ -506,15 +506,15 @@ static int exact_lock(dev_t devt, void *data)
 	return 0;
 }
 
-static void register_disk(struct gendisk *disk)
+static void register_disk(struct device *parent, struct gendisk *disk)
 {
 	struct device *ddev = disk_to_dev(disk);
 	struct block_device *bdev;
 	struct disk_part_iter piter;
 	struct hd_struct *part;
 	int err;
 
-	ddev->parent = disk->driverfs_dev;
+	ddev->parent = parent;
 
 	dev_set_name(ddev, "%s", disk->disk_name);
 
@@ -573,15 +573,16 @@ static void register_disk(struct gendisk *disk)
 }
 
 /**
- * add_disk - add partitioning information to kernel list
+ * device_add_disk - add partitioning information to kernel list
+ * @parent: parent device for the disk
  * @disk: per-device partitioning information
  *
  * This function registers the partitioning information in @disk
  * with the kernel.
  *
  * FIXME: error handling
  */
-void add_disk(struct gendisk *disk)
+void device_add_disk(struct device *parent, struct gendisk *disk)
 {
 	struct backing_dev_info *bdi;
 	dev_t devt;
@@ -617,7 +618,11 @@ void add_disk(struct gendisk *disk)
 
 	blk_register_region(disk_devt(disk), disk->minors, NULL,
 			    exact_match, exact_lock, disk);
-	register_disk(disk);
+
+	/* temporary while we convert usages to use disk_to_dev(disk)->parent */
+	disk->driverfs_dev = parent;
+
+	register_disk(parent, disk);
 	blk_register_queue(disk);
 
 	/*
@@ -633,7 +638,7 @@ void add_disk(struct gendisk *disk)
 	disk_add_events(disk);
 	blk_integrity_add(disk);
 }
-EXPORT_SYMBOL(add_disk);
+EXPORT_SYMBOL(device_add_disk);
 
 void del_gendisk(struct gendisk *disk)
 {

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
@@ -414,7 +414,13 @@ static inline void free_part_info(struct hd_struct *part)
 extern void part_round_stats(int cpu, struct hd_struct *part);
 
 /* block/genhd.c */
-extern void add_disk(struct gendisk *disk);
+extern void device_add_disk(struct device *parent, struct gendisk *disk);
+static inline void add_disk(struct gendisk *disk)
+{
+	/* temporary while we convert callers to device_add_disk */
+	device_add_disk(disk->driverfs_dev, disk);
+}
+
 extern void del_gendisk(struct gendisk *gp);
 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);