[PATCH 4/7] dm/md dependency tree in sysfs: bd_claim_by_disk

["Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>]

This patch is part of dm/md dependency tree in sysfs.

This adds variants of bd_claim_by_kobject which takes gendisk instead
of kobject and do kobject_{get,put}(&gendisk->slave_dir).

Thanks,
-- 
Jun'ichi Nomura, NEC Solutions (America), Inc.

Variants of bd_claim_by_kobject which takes gendisk instead
of kobject and do kobject_{get,put}(&gendisk->slave_dir).

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>

 include/linux/genhd.h |   13 +++++++++++++
 1 files changed, 13 insertions(+)

--- linux-2.6.16-rc6.orig/include/linux/genhd.h	2006-03-11 17:12:55.000000000 -0500
+++ linux-2.6.16-rc6/include/linux/genhd.h	2006-03-13 11:24:13.000000000 -0500
@@ -421,6 +424,19 @@ static inline struct block_device *bdget
 	return bdget(MKDEV(disk->major, disk->first_minor) + index);
 }
 
+static inline int bd_claim_by_disk(struct block_device *bdev,
+					void *holder, struct gendisk *disk)
+{
+	return bd_claim_by_kobject(bdev, holder, kobject_get(disk->slave_dir));
+}
+
+static inline void bd_release_from_disk(struct block_device *bdev,
+					struct gendisk *disk)
+{
+	bd_release_from_kobject(bdev, disk->slave_dir);
+	kobject_put(disk->slave_dir);
+}
+
 #endif
 
 #endif