fsnotify: add flags to fsnotify_mark_entries

To differentiate between inode and vfsmount (or other future) types of
marks we add a flags field and set the inode bit on inode marks (the only
currently supported type of mark)

Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 6731408..b000658 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -322,6 +322,8 @@
 	if (unlikely(!inode))
 		return -EINVAL;
 
+	entry->flags = FSNOTIFY_MARK_FLAG_INODE;
+
 	/*
 	 * if this group isn't being testing for inode type events we need
 	 * to start testing