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

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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
  3168b0780d 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>
This commit is contained in:
Satyam Sharma
2007-07-04 16:37:16 +05:30
committed by Mark Fasheh
parent 9b1d9aa4e9
commit 3fe6c5ce11
3 changed files with 11 additions and 16 deletions
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7
include/linux/configfs.h
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@@ -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 {