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+.. SPDX-License-Identifier: GPL-2.0
+
+====================================
+File system Monitoring with fanotify
+====================================
+
+fanotify supports the FAN_ERROR mark for file system-wide error
+reporting.  It is meant to be used by file system health monitoring
+daemons who listen on that interface and take actions (notify sysadmin,
+start recovery) when a file system problem is detected by the kernel.
+
+By design, A FAN_ERROR notification exposes sufficient information for a
+monitoring tool to know a problem in the file system has happened.  It
+doesn't necessarily provide a user space application with semantics to
+verify an IO operation was successfully executed.  That is outside of
+scope of this feature. Instead, it is only meant as a framework for
+early file system problem detection and reporting recovery tools.
+
+At the time of this writing, the only file system that emits this
+FAN_ERROR notifications is ext4.
+
+A user space example code is provided at ``samples/fanotify/fs-monitor.c``.
+
+Usage
+=====
+
+Notification structure
+======================
+
+A FAN_ERROR Notification has the following format::
+
+  [ Notification Metadata (Mandatory) ]
+  [ Generic Error Record  (Mandatory) ]
+
+With the exception of the notification metadata and the generic
+information, all information records are optional.  Each record type is
+identified by its unique ``struct fanotify_event_info_header.info_type``.