fsnotify: fsnotify_obtain_group should be fsnotify_alloc_group

fsnotify_obtain_group was intended to be able to find an already existing
group.  Nothing uses that functionality.  This just renames it to
fsnotify_alloc_group so it is clear what it is doing.
Signed-off-by: NEric Paris <eparis@redhat.com>

fs/notify/dnotify/dnotify.c

@@ -433,7 +433,7 @@ static int __init dnotify_init(void)
 	dnotify_struct_cache = KMEM_CACHE(dnotify_struct, SLAB_PANIC);
 	dnotify_mark_entry_cache = KMEM_CACHE(dnotify_mark_entry, SLAB_PANIC);
 
-	dnotify_group = fsnotify_obtain_group(0, &dnotify_fsnotify_ops);
+	dnotify_group = fsnotify_alloc_group(0, &dnotify_fsnotify_ops);
 	if (IS_ERR(dnotify_group))
 		panic("unable to allocate fsnotify group for dnotify\n");
 	return 0;

fs/notify/group.c

@@ -162,16 +162,13 @@ void fsnotify_put_group(struct fsnotify_group *group)
 }
 
 /*
- * Either finds an existing group which matches the group_num, mask, and ops or
- * creates a new group and adds it to the global group list.  In either case we
- * take a reference for the group returned.
+ * Create a new fsnotify_group and hold a reference for the group returned.
  */
-struct fsnotify_group *fsnotify_obtain_group(__u32 mask,
-					     const struct fsnotify_ops *ops)
+struct fsnotify_group *fsnotify_alloc_group(__u32 mask,
+					    const struct fsnotify_ops *ops)
 {
 	struct fsnotify_group *group;
 
-	/* very low use, simpler locking if we just always alloc */
 	group = kzalloc(sizeof(struct fsnotify_group), GFP_KERNEL);
 	if (!group)
 		return ERR_PTR(-ENOMEM);
@@ -192,7 +189,6 @@ struct fsnotify_group *fsnotify_obtain_group(__u32 mask,
 
 	mutex_lock(&fsnotify_grp_mutex);
 
-	/* group not found, add a new one */
 	list_add_rcu(&group->group_list, &fsnotify_groups);
 	group->on_group_list = 1;
 	/* being on the fsnotify_groups list holds one num_marks */

fs/notify/inotify/inotify_user.c

@@ -695,7 +695,7 @@ static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsign
 {
 	struct fsnotify_group *group;
 
-	group = fsnotify_obtain_group(0, &inotify_fsnotify_ops);
+	group = fsnotify_alloc_group(0, &inotify_fsnotify_ops);
 	if (IS_ERR(group))
 		return group;
 

include/linux/fsnotify_backend.h

@@ -305,11 +305,11 @@ static inline void __fsnotify_d_instantiate(struct dentry *dentry, struct inode
 /* must call when a group changes its ->mask */
 extern void fsnotify_recalc_global_mask(void);
 /* get a reference to an existing or create a new group */
-extern struct fsnotify_group *fsnotify_obtain_group(__u32 mask,
+extern struct fsnotify_group *fsnotify_alloc_group(__u32 mask,
 						    const struct fsnotify_ops *ops);
 /* run all marks associated with this group and update group->mask */
 extern void fsnotify_recalc_group_mask(struct fsnotify_group *group);
-/* drop reference on a group from fsnotify_obtain_group */
+/* drop reference on a group from fsnotify_alloc_group */
 extern void fsnotify_put_group(struct fsnotify_group *group);
 
 /* take a reference to an event */

kernel/audit_tree.c

@@ -937,7 +937,7 @@ static int __init audit_tree_init(void)
 {
 	int i;
 
-	audit_tree_group = fsnotify_obtain_group(0, &audit_tree_ops);
+	audit_tree_group = fsnotify_alloc_group(0, &audit_tree_ops);
 	if (IS_ERR(audit_tree_group))
 		audit_panic("cannot initialize fsnotify group for rectree watches");
 

kernel/audit_watch.c

@@ -577,8 +577,8 @@ static const struct fsnotify_ops audit_watch_fsnotify_ops = {
 
 static int __init audit_watch_init(void)
 {
-	audit_watch_group = fsnotify_obtain_group(AUDIT_FS_WATCH,
-						  &audit_watch_fsnotify_ops);
+	audit_watch_group = fsnotify_alloc_group(AUDIT_FS_WATCH,
+						 &audit_watch_fsnotify_ops);
 	if (IS_ERR(audit_watch_group)) {
 		audit_watch_group = NULL;
 		audit_panic("cannot create audit fsnotify group");