fsnotify: initialize the group->num_marks in a better place
Currently the comments say that group->num_marks is held because the group
is on the fsnotify_group list. This isn't strictly the case, we really
just hold the num_marks for the life of the group (any time group->refcnt
is != 0) This patch moves the initialization stuff and makes it clear when
it is really being held.
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/fs/notify/group.c b/fs/notify/group.c
index c808097..656c534 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -82,9 +82,6 @@
BUG_ON(!mutex_is_locked(&fsnotify_grp_mutex));
group->on_inode_group_list = 1;
- /* being on the fsnotify_groups list holds one num_marks */
- atomic_inc(&group->num_marks);
-
list_add_tail_rcu(&group->inode_group_list, &fsnotify_inode_groups);
}
@@ -183,7 +180,14 @@
if (!group)
return ERR_PTR(-ENOMEM);
+ /* set to 0 when there a no external references to this group */
atomic_set(&group->refcnt, 1);
+ /*
+ * hits 0 when there are no external references AND no marks for
+ * this group
+ */
+ atomic_set(&group->num_marks, 1);
+
mutex_init(&group->notification_mutex);
INIT_LIST_HEAD(&group->notification_list);