[PATCH] dm/md dependency tree in sysfs: holders/slaves subdirectory

Creating "slaves" and "holders" directories in /sys/block/<disk> and
creating "holders" directory under /sys/block/<disk>/<partition>

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, 7 insertions, 0 deletions

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index fd647fde5ec1..eea61cc8fac1 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -78,6 +78,9 @@ struct hd_struct {
         sector_t start_sect;
         sector_t nr_sects;
         struct kobject kobj;
+#ifdef CONFIG_SYSFS
+        struct kobject *holder_dir;
+#endif
         unsigned ios[2], sectors[2];    /* READs and WRITEs */
         int policy, partno;
 };
@@ -114,6 +117,10 @@ struct gendisk {
         int number;                     /* more of the same */
         struct device *driverfs_dev;
         struct kobject kobj;
+#ifdef CONFIG_SYSFS
+        struct kobject *holder_dir;
+        struct kobject *slave_dir;
+#endif
 
         struct timer_rand_state *random;
         int policy;