Driver core: convert block from raw kobjects to core devices

This moves the block devices to /sys/class/block. It will create a
flat list of all block devices, with the disks and partitions in one
directory. For compatibility /sys/block is created and contains symlinks
to the disks.

  /sys/class/block
  |-- sda -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda
  |-- sda1 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda1
  |-- sda10 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda10
  |-- sda5 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda5
  |-- sda6 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda6
  |-- sda7 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda7
  |-- sda8 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda8
  |-- sda9 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda9
  `-- sr0 -> ../../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0

  /sys/block/
  |-- sda -> ../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda
  `-- sr0 -> ../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 23 insertions, 14 deletions

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index a47b8025d39..1dbea0ac569 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -10,9 +10,19 @@
  */
 
 #include <linux/types.h>
+#include <linux/kdev_t.h>
 
 #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)
+
+extern struct device_type disk_type;
+extern struct device_type part_type;
+extern struct kobject *block_depr;
+extern struct class block_class;
+
 enum {
 /* These three have identical behaviour; use the second one if DOS FDISK gets
    confused about extended/logical partitions starting past cylinder 1023. */
@@ -84,7 +94,7 @@ struct partition {
 struct hd_struct {
         sector_t start_sect;
         sector_t nr_sects;
-        struct kobject kobj;
+        struct device dev;
         struct kobject *holder_dir;
         unsigned ios[2], sectors[2];    /* READs and WRITEs */
         int policy, partno;
@@ -117,15 +127,14 @@ struct gendisk {
                                          * disks that can't be partitioned. */
         char disk_name[32];             /* name of major driver */
         struct hd_struct **part;        /* [indexed by minor] */
-        int part_uevent_suppress;
         struct block_device_operations *fops;
         struct request_queue *queue;
         void *private_data;
         sector_t capacity;
 
         int flags;
-        struct device *driverfs_dev;
-        struct kobject kobj;
+        struct device *driverfs_dev;  // FIXME: remove
+        struct device dev;
         struct kobject *holder_dir;
         struct kobject *slave_dir;
 
@@ -143,13 +152,6 @@ struct gendisk {
         struct work_struct async_notify;
 };
 
-/* Structure for sysfs attributes on block devices */
-struct disk_attribute {
-        struct attribute attr;
-        ssize_t (*show)(struct gendisk *, char *);
-        ssize_t (*store)(struct gendisk *, const char *, size_t);
-};
-
 /* 
  * Macros to operate on percpu disk statistics:
  *
@@ -411,7 +413,8 @@ struct unixware_disklabel {
 #define ADDPART_FLAG_RAID       1
 #define ADDPART_FLAG_WHOLEDISK  2
 
-char *disk_name (struct gendisk *hd, int part, char *buf);
+extern dev_t blk_lookup_devt(const char *name);
+extern char *disk_name (struct gendisk *hd, int part, char *buf);
 
 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
@@ -423,12 +426,12 @@ extern struct gendisk *alloc_disk(int minors);
 extern struct kobject *get_disk(struct gendisk *disk);
 extern void put_disk(struct gendisk *disk);
 extern void genhd_media_change_notify(struct gendisk *disk);
-extern void blk_register_region(dev_t dev, unsigned long range,
+extern void blk_register_region(dev_t devt, unsigned long range,
                         struct module *module,
                         struct kobject *(*probe)(dev_t, int *, void *),
                         int (*lock)(dev_t, void *),
                         void *data);
-extern void blk_unregister_region(dev_t dev, unsigned long range);
+extern void blk_unregister_region(dev_t devt, unsigned long range);
 
 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 {
@@ -441,6 +444,12 @@ static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
 
 static inline void printk_all_partitions(void) { }
 
+static inline dev_t blk_lookup_devt(const char *name)
+{
+        dev_t devt = MKDEV(0, 0);
+        return devt;
+}
+
 #endif /* CONFIG_BLOCK */
 
 #endif