--- zzzz-none-000/linux-2.6.39.4/include/linux/fsnotify_backend.h	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/include/linux/fsnotify_backend.h	2021-11-10 13:38:17.000000000 +0000
@@ -54,6 +54,11 @@
 /* This inode cares about things that happen to its children.  Always set for
  * dnotify and inotify. */
 #define FS_EVENT_ON_CHILD	0x08000000
+/**
+ * This inode cares about things that happen to its children and their children.
+ * May be configured for inotify by using the IN_RECURSIVE flag.
+ */
+#define FS_EVENT_ON_CHILD_RECURSIVLY 0x10000000
 
 /* This is a list of all events that may get sent to a parernt based on fs event
  * happening to inodes inside that directory */
@@ -62,18 +67,25 @@
 				   FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
 				   FS_DELETE)
 
+/**
+ * This is a list of all events that are allowed to propagate recursivly upwards
+ * the dentry tree
+ */
+#define FS_EVENTS_POSS_ON_CHILD_RECURSIVLY                                 \
+	(FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_MOVED_FROM | FS_MOVED_TO | \
+	 FS_CREATE | FS_DELETE)
+
 #define FS_MOVE			(FS_MOVED_FROM | FS_MOVED_TO)
 
 #define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
 
-#define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
-			     FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN | \
-			     FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
-			     FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
-			     FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
-			     FS_OPEN_PERM | FS_ACCESS_PERM | FS_EXCL_UNLINK | \
-			     FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME | \
-			     FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
+#define ALL_FSNOTIFY_EVENTS                                                   \
+	(FS_ACCESS | FS_MODIFY | FS_ATTRIB | FS_CLOSE_WRITE |                 \
+	 FS_CLOSE_NOWRITE | FS_OPEN | FS_MOVED_FROM | FS_MOVED_TO |           \
+	 FS_CREATE | FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | FS_UNMOUNT | \
+	 FS_Q_OVERFLOW | FS_IN_IGNORED | FS_OPEN_PERM | FS_ACCESS_PERM |      \
+	 FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME |           \
+	 FS_DN_MULTISHOT | FS_EVENT_ON_CHILD | FS_EVENT_ON_CHILD_RECURSIVLY)
 
 struct fsnotify_group;
 struct fsnotify_event;
@@ -321,6 +333,21 @@
 	return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD;
 }
 
+static inline int
+fsnotify_inode_watches_children_recursivly(struct inode *inode)
+{
+	/*
+	 * FS_EVENT_ON_CHILD is set if the inode may care
+	 */
+	if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD_RECURSIVLY))
+		return 0;
+	/*
+	 * this inode might care about child events, does it care about the
+	 * specific set of events that can happen on a child?
+	 */
+	return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD_RECURSIVLY;
+}
+
 /*
  * Update the dentry with a flag indicating the interest of its parent to receive
  * filesystem events when those events happens to this dentry->d_inode.
@@ -343,6 +370,13 @@
 		dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
 	else
 		dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
+
+	if (parent->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED_RECURSIVLY ||
+	    (parent->d_inode &&
+	     fsnotify_inode_watches_children_recursivly(parent->d_inode)))
+		dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED_RECURSIVLY;
+	else
+		dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED_RECURSIVLY;
 }
 
 /*
@@ -465,6 +499,22 @@
 
 #endif	/* CONFIG_FSNOTIFY */
 
+#if defined(CONFIG_FSNOTIFY) && defined(CONFIG_FSNOTIFY_RECURSIVE)
+extern int __fsnotify_parent_recursive(struct path *path, struct dentry *dentry,
+				       struct dentry *first_parent,
+				       const char *name, __u32 mask,
+				       u32 cookie);
+#else
+static inline int __fsnotify_parent_recursive(struct path *path,
+					      struct dentry *dentry,
+					      struct dentry *first_parent,
+					      const char *name, __u32 mask,
+					      u32 cookie)
+{
+	return 0;
+}
+#endif
+
 #endif	/* __KERNEL __ */
 
 #endif	/* __LINUX_FSNOTIFY_BACKEND_H */