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From: Gabriel Krisman Bertazi <>
	Gabriel Krisman Bertazi <>
Subject: [PATCH v2 14/14] Documentation: Document the FAN_FS_ERROR event
Date: Tue, 15 Jun 2021 19:55:56 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Document the FAN_FS_ERROR event for user administrators and user space

Signed-off-by: Gabriel Krisman Bertazi <>

Changes since v1:
  - Drop references to location record
  - Explain that the inode field is optional
  - Explain we are reporting only the first error
 .../admin-guide/filesystem-monitoring.rst     | 63 +++++++++++++++++++
 Documentation/admin-guide/index.rst           |  1 +
 2 files changed, 64 insertions(+)
 create mode 100644 Documentation/admin-guide/filesystem-monitoring.rst

diff --git a/Documentation/admin-guide/filesystem-monitoring.rst b/Documentation/admin-guide/filesystem-monitoring.rst
new file mode 100644
index 000000000000..3710302676af
--- /dev/null
+++ b/Documentation/admin-guide/filesystem-monitoring.rst
@@ -0,0 +1,63 @@
+.. SPDX-License-Identifier: GPL-2.0
+File system Monitoring with fanotify
+fanotify supports the FAN_FS_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_FS_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.
+When a file system operation fails, it is common for dozens of kernel
+errors to cascade after the initial failure, hiding the original failure
+log, which is usually the most useful debug data to troubleshoot the
+problem.  For this reason, FAN_FS_ERROR only reports the first error that
+occurred since the last notification, and it simply counts addition
+errors.  This ensures that the most important piece of error information
+is never lost.
+At the time of this writing, the only file system that emits FAN_FS_ERROR
+notifications is Ext4.
+A user space example code is provided at ``samples/fanotify/fs-monitor.c``.
+Notification structure
+A FAN_FS_ERROR Notification has the following format::
+  [ Notification Metadata (Mandatory) ]
+  [ Generic Error Record  (Mandatory) ]
+Generic error record
+The generic error record provides enough information for a file system
+agnostic tool to learn about a problem in the file system, without
+providing any additional details about the problem.  This record is
+identified by ``struct fanotify_event_info_header.info_type`` being set
+  struct fanotify_event_info_error {
+	struct fanotify_event_info_header hdr;
+	int error;
+	__u32 error_count;
+	__kernel_fsid_t fsid;
+	__u64 ino;
+	__u32 ino_generation;
+  };
+The `error` field identifies the type of error.  `fsid` identifies the
+file system that originated the error, since multiple file systems might
+be reporting to the same fanotify group.  The `inode` field is optional,
+as it depends on whether the error is linked to an specific inode.
+`error_count` count tracks the number of errors that occurred and were
+suppressed to preserve the original error, since the last notification.
diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst
index dc00afcabb95..1bedab498104 100644
--- a/Documentation/admin-guide/index.rst
+++ b/Documentation/admin-guide/index.rst
@@ -82,6 +82,7 @@ configure specific aspects of kernel behavior to your liking.
+   filesystem-monitoring

      parent reply	other threads:[~2021-06-15 23:56 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15 23:55 [PATCH v2 00/14] File system wide monitoring Gabriel Krisman Bertazi
2021-06-15 23:55 ` [PATCH v2 01/14] fsnotify: Don't call insert hook for overflow events Gabriel Krisman Bertazi
2021-06-16  7:49   ` Amir Goldstein
2021-06-15 23:55 ` [PATCH v2 02/14] fanotify: Fold event size calculation to its own function Gabriel Krisman Bertazi
2021-06-15 23:55 ` [PATCH v2 03/14] fanotify: Split fsid check from other fid mode checks Gabriel Krisman Bertazi
2021-06-16  8:07   ` Amir Goldstein
2021-06-15 23:55 ` [PATCH v2 04/14] fanotify: Split superblock marks out to a new cache Gabriel Krisman Bertazi
2021-06-16  9:16   ` Amir Goldstein
2021-06-15 23:55 ` [PATCH v2 05/14] inotify: Don't force FS_IN_IGNORED Gabriel Krisman Bertazi
2021-06-15 23:55 ` [PATCH v2 06/14] fsnotify: Add helper to detect overflow_event Gabriel Krisman Bertazi
2021-06-16  9:23   ` Amir Goldstein
2021-06-15 23:55 ` [PATCH v2 07/14] fsnotify: pass arguments of fsnotify() in struct fsnotify_event_info Gabriel Krisman Bertazi
2021-06-16  9:26   ` Amir Goldstein
2021-06-16 10:11   ` kernel test robot
2021-06-15 23:55 ` [PATCH v2 08/14] fsnotify: Support passing argument to insert callback on add_event Gabriel Krisman Bertazi
2021-06-15 23:55 ` [PATCH v2 09/14] fsnotify: Support FS_ERROR event type Gabriel Krisman Bertazi
2021-06-16  9:29   ` Amir Goldstein
2021-06-15 23:55 ` [PATCH v2 10/14] fsnotify: Introduce helpers to send error_events Gabriel Krisman Bertazi
2021-06-16  9:38   ` Amir Goldstein
2021-06-15 23:55 ` [PATCH v2 11/14] fanotify: Introduce FAN_FS_ERROR event Gabriel Krisman Bertazi
2021-06-16 11:02   ` Amir Goldstein
2021-06-15 23:55 ` [PATCH v2 12/14] ext4: Send notifications on error Gabriel Krisman Bertazi
2021-06-15 23:55 ` [PATCH v2 13/14] samples: Add fs error monitoring example Gabriel Krisman Bertazi
2021-06-16 13:04   ` kernel test robot
2021-06-15 23:55 ` Gabriel Krisman Bertazi [this message]

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