[PATCH] dm/md dependency tree in sysfs: md to use bd_claim_by_disk

Use bd_claim_by_disk.

Following symlinks are created if md0 is built from sda and sdb
  /sys/block/md0/slaves/sda --> /sys/block/sda
  /sys/block/md0/slaves/sdb --> /sys/block/sdb
  /sys/block/sda/holders/md0 --> /sys/block/md0
  /sys/block/sdb/holders/md0 --> /sys/block/md0

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 5ed2228745cb..bde3e9682250 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1301,6 +1301,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
         else
                 ko = &rdev->bdev->bd_disk->kobj;
         sysfs_create_link(&rdev->kobj, ko, "block");
+        bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
         return 0;
 }
 
@@ -1311,6 +1312,7 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
                 MD_BUG();
                 return;
         }
+        bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
         list_del_init(&rdev->same_set);
         printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
         rdev->mddev = NULL;