Re: [PATCH 2/6] Adjust watch_queue documentation to mention mount and superblock watches. [ver #5]

Signed-off-by: David Howells <dhowells@redhat.com>
---

 Documentation/watch_queue.rst |   20 +++++++++++++++++++-
 drivers/misc/Kconfig          |    5 +++--
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/Documentation/watch_queue.rst b/Documentation/watch_queue.rst
index 4087a8e670a8..1bec2018d549 100644
--- a/Documentation/watch_queue.rst
+++ b/Documentation/watch_queue.rst

@@ -13,6 +13,10 @@ receive notifications from the kernel.  This can be used in conjunction with::
 
     * USB subsystem event notifications
 
+  * Mount topology change notifications
+
+  * Superblock event notifications
+
 
 The notifications buffers can be enabled by:
 

@@ -324,6 +328,19 @@ Any particular buffer can be fed from multiple sources.  Sources include:
     for buses and devices.  Watchpoints of this type are set on the global
     device watch list.
 
+  * WATCH_TYPE_MOUNT_NOTIFY
+
+    Notifications of this type indicate mount tree topology changes and mount
+    attribute changes.  A watch can be set on a particular file or directory
+    and notifications from the path subtree rooted at that point will be
+    intercepted.
+
+  * WATCH_TYPE_SB_NOTIFY
+
+    Notifications of this type indicate superblock events, such as quota limits
+    being hit, I/O errors being produced or network server loss/reconnection.
+    Watches of this type are set directly on superblocks.
+
 
 Event Filtering
 ===============

@@ -365,7 +382,8 @@ Where:
 	(watch.info & info_mask) == info_filter
 
     This could be used, for example, to ignore events that are not exactly on
-    the watched point in a mount tree.
+    the watched point in a mount tree by specifying NOTIFY_MOUNT_IN_SUBTREE
+    must be 0.