[PATCH v4 1/5] block: introduce device_add_disk()

From: Dan Williams
Date: Tue Jun 21 2016 - 16:54:31 EST


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 <hch@xxxxxx>
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Reviewed-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
block/genhd.c | 13 +++++++------
include/linux/genhd.h | 8 +++++++-
2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9f42526b4d62..932e70c113d0 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -506,7 +506,7 @@ 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;
@@ -514,7 +514,7 @@ static void register_disk(struct gendisk *disk)
struct hd_struct *part;
int err;

- ddev->parent = disk->driverfs_dev;
+ ddev->parent = parent;

dev_set_name(ddev, "%s", disk->disk_name);

@@ -573,7 +573,8 @@ exit:
}

/**
- * 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
@@ -581,7 +582,7 @@ exit:
*
* 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 +618,7 @@ void add_disk(struct gendisk *disk)

blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
- register_disk(disk);
+ register_disk(parent, disk);
blk_register_queue(disk);

/*
@@ -633,7 +634,7 @@ 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
index 359a8e4bd44d..df1dabbfd388 100644
--- 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);