configfs: Convert subsystem semaphore to mutex
Convert the su_sem member of struct configfs_subsystem to a struct
mutex, as that's what it is. Also convert all the users and update
Documentation/configfs.txt and Documentation/configfs_example.c
accordingly.
[ Conflict in fs/dlm/config.c with commit
3168b0780d06ace875696f8a648d04d6089654e5 manually resolved. --Mark ]
Inspired-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 4348cb4..2f8e3c8 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -607,7 +607,7 @@
int dlm_config_init(void)
{
config_group_init(&clusters_root.subsys.su_group);
- init_MUTEX(&clusters_root.subsys.su_sem);
+ mutex_init(&clusters_root.subsys.su_mutex);
return configfs_register_subsystem(&clusters_root.subsys);
}
@@ -751,9 +751,9 @@
if (!space_list)
return NULL;
- down(&space_list->cg_subsys->su_sem);
+ mutex_lock(&space_list->cg_subsys->su_mutex);
i = config_group_find_item(space_list, name);
- up(&space_list->cg_subsys->su_sem);
+ mutex_unlock(&space_list->cg_subsys->su_mutex);
return to_space(i);
}
@@ -772,7 +772,7 @@
if (!comm_list)
return NULL;
- down(&clusters_root.subsys.su_sem);
+ mutex_lock(&clusters_root.subsys.su_mutex);
list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
cm = to_comm(i);
@@ -792,7 +792,7 @@
break;
}
}
- up(&clusters_root.subsys.su_sem);
+ mutex_unlock(&clusters_root.subsys.su_mutex);
if (!found)
cm = NULL;