[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>
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index f924f45..60523ce 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -297,6 +297,30 @@
.sysfs_ops = &part_sysfs_ops,
};
+#ifdef CONFIG_SYSFS
+static inline void partition_sysfs_add_subdir(struct hd_struct *p)
+{
+ struct kobject *k;
+
+ k = kobject_get(&p->kobj);
+ p->holder_dir = kobject_add_dir(k, "holders");
+ kobject_put(k);
+}
+
+static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
+{
+ struct kobject *k;
+
+ k = kobject_get(&disk->kobj);
+ disk->holder_dir = kobject_add_dir(k, "holders");
+ disk->slave_dir = kobject_add_dir(k, "slaves");
+ kobject_put(k);
+}
+#else
+#define partition_sysfs_add_subdir(x) do { } while (0)
+#define disk_sysfs_add_subdirs(x) do { } while (0)
+#endif
+
void delete_partition(struct gendisk *disk, int part)
{
struct hd_struct *p = disk->part[part-1];
@@ -310,6 +334,10 @@
p->ios[0] = p->ios[1] = 0;
p->sectors[0] = p->sectors[1] = 0;
devfs_remove("%s/part%d", disk->devfs_name, part);
+#ifdef CONFIG_SYSFS
+ if (p->holder_dir)
+ kobject_unregister(p->holder_dir);
+#endif
kobject_unregister(&p->kobj);
}
@@ -337,6 +365,7 @@
p->kobj.parent = &disk->kobj;
p->kobj.ktype = &ktype_part;
kobject_register(&p->kobj);
+ partition_sysfs_add_subdir(p);
disk->part[part-1] = p;
}
@@ -383,6 +412,7 @@
if ((err = kobject_add(&disk->kobj)))
return;
disk_sysfs_symlinks(disk);
+ disk_sysfs_add_subdirs(disk);
kobject_uevent(&disk->kobj, KOBJ_ADD);
/* No minors to use for partitions */
@@ -483,6 +513,12 @@
devfs_remove_disk(disk);
+#ifdef CONFIG_SYSFS
+ if (disk->holder_dir)
+ kobject_unregister(disk->holder_dir);
+ if (disk->slave_dir)
+ kobject_unregister(disk->slave_dir);
+#endif
if (disk->driverfs_dev) {
char *disk_name = make_block_name(disk);
sysfs_remove_link(&disk->kobj, "device");