fsnotify: allow groups to set freeing_mark to null

Most fsnotify listeners (all but inotify) do not care about marks being
freed.  Allow groups to set freeing_mark to null and do not call any
function if it is set that way.

Signed-off-by: Eric Paris <eparis@redhat.com>

2 files changed, 3 insertions, 8 deletions

diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 98a751614c74..828a889be909 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -161,12 +161,6 @@ static bool dnotify_should_send_event(struct fsnotify_group *group,
         return send;
 }
 
-static void dnotify_freeing_mark(struct fsnotify_mark_entry *entry,
-                                 struct fsnotify_group *group)
-{
-        /* dnotify doesn't care than an inode is on the way out */
-}
-
 static void dnotify_free_mark(struct fsnotify_mark_entry *entry)
 {
         struct dnotify_mark_entry *dnentry = container_of(entry,
@@ -182,7 +176,7 @@ static struct fsnotify_ops dnotify_fsnotify_ops = {
         .handle_event = dnotify_handle_event,
         .should_send_event = dnotify_should_send_event,
         .free_group_priv = NULL,
-        .freeing_mark = dnotify_freeing_mark,
+        .freeing_mark = NULL,
         .free_event_priv = NULL,
 };
 
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 0a499d2c6191..c8a07c65482b 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -190,7 +190,8 @@ void fsnotify_destroy_mark_by_entry(struct fsnotify_mark_entry *entry)
          * callback to the group function to let it know that this entry
          * is being freed.
          */
-        group->ops->freeing_mark(entry, group);
+        if (group->ops->freeing_mark)
+                group->ops->freeing_mark(entry, group);
 
         /*
          * __fsnotify_update_child_dentry_flags(inode);