[PATCH] configfs+dlm: Rename config_group_find_obj and state semantics clearly

Configfs being based upon sysfs code, config_group_find_obj() is probably
so named because of the similar kset_find_obj() in sysfs. However,
"kobject"s in sysfs become "config_item"s in configfs, so let's call it
config_group_find_item() instead, for sake of uniformity, and make
corresponding change in the users of this function.

BTW a crucial difference between kset_find_obj and config_group_find_item
is in locking expectations. kset_find_obj does its locking by itself, but
config_group_find_item expects the *caller* to do the locking. The reason
for this: kset's have their own locks, config_group's don't but instead
rely on the subsystem mutex. And, subsystem needn't necessarily be around
when config_group_find_item() is called.

So let's state these locking semantics explicitly, and rectify the comment,
otherwise bugs could continue to occur in future, as they did in the past
(refer commit d82b8191e238 in gfs2-2.6-fixes.git).

[ I also took the opportunity to fix some bad whitespace and
double-empty lines. --Joel ]

[ Conflict in fs/dlm/config.c with commit
  3168b0780d06ace875696f8a648d04d6089654e5 manually resolved. --Mark ]

Signed-off-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Cc: David Teigland <teigland@redhat.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index def7c83d43a2..bbb1b6cafa8b 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -86,12 +86,10 @@ struct config_item_type {
         struct configfs_attribute               **ct_attrs;
 };
 
-
 /**
  *      group - a group of config_items of a specific type, belonging
  *      to a specific subsystem.
  */
-
 struct config_group {
         struct config_item              cg_item;
         struct list_head                cg_children;
@@ -99,13 +97,11 @@ struct config_group {
         struct config_group             **default_groups;
 };
 
-
 extern void config_group_init(struct config_group *group);
 extern void config_group_init_type_name(struct config_group *group,
                                         const char *name,
                                         struct config_item_type *type);
 
-
 static inline struct config_group *to_config_group(struct config_item *item)
 {
         return item ? container_of(item,struct config_group,cg_item) : NULL;
@@ -121,7 +117,8 @@ static inline void config_group_put(struct config_group *group)
         config_item_put(&group->cg_item);
 }
 
-extern struct config_item *config_group_find_obj(struct config_group *, const char *);
+extern struct config_item *config_group_find_item(struct config_group *,
+                                                  const char *);
 
 
 struct configfs_attribute {