[PATCH 2/2] fanotify.7, fanotify_init.2, fanotify_mark.2: Document FAN_RENAME

[Amir Goldstein <amir73il@gmail.com>]

FAN_RENAME is a new event type that includes information about
both old and new directory entries.

It is a successor of the two separate FAN_MOVED_TO/FROM events,
but those event types are still supported.

Reviewed-by: Matthew Bobrowski <repnop@google.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 man2/fanotify_init.2 | 21 +++++++++++++++++----
 man2/fanotify_mark.2 | 16 ++++++++++++++++
 man7/fanotify.7      |  4 ++++
 3 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/man2/fanotify_init.2 b/man2/fanotify_init.2
index ac4d3a305..bf87f394b 100644
--- a/man2/fanotify_init.2
+++ b/man2/fanotify_init.2
@@ -173,6 +173,7 @@ Additionally, it may be used for applications monitoring a directory or a
 filesystem that are interested in the directory entry modification events
 .BR FAN_CREATE ,
 .BR FAN_DELETE ,
+.BR FAN_RENAME ,
 and
 .BR FAN_MOVE ,
 or in events such as
@@ -257,6 +258,15 @@ For the directory entry modification events
 and
 .BR FAN_MOVE ,
 the reported name is that of the created/deleted/moved directory entry.
+The event
+.B FAN_RENAME
+may contain two information records.
+One of type
+.B FAN_EVENT_INFO_TYPE_OLD_DFID_NAME
+identifying the old directory entry,
+and another of type
+.B FAN_EVENT_INFO_TYPE_NEW_DFID_NAME
+identifying the new directory entry.
 For other events that occur on a directory object, the reported file handle
 is that of the directory object itself and the reported name is '.'.
 For other events that occur on a non-directory object, the reported file handle
@@ -301,14 +311,17 @@ will be returned.
 For the directory entry modification events
 .BR FAN_CREATE ,
 .BR FAN_DELETE ,
+.BR FAN_RENAME ,
 and
 .BR FAN_MOVE ,
 an additional record of type
 .BR FAN_EVENT_INFO_TYPE_FID ,
-is reported in addition to the information record of type
-.B FAN_EVENT_INFO_TYPE_DFID
-or
-.BR FAN_EVENT_INFO_TYPE_DFID_NAME .
+is reported in addition to the information records of type
+.BR FAN_EVENT_INFO_TYPE_DFID ,
+.BR FAN_EVENT_INFO_TYPE_DFID_NAME ,
+.BR FAN_EVENT_INFO_TYPE_OLD_DFID_NAME ,
+and
+.BR FAN_EVENT_INFO_TYPE_NEW_DFID_NAME .
 The additional record includes a file handle
 that identifies the filesystem child object
 that the directory entry is referring to.
diff --git a/man2/fanotify_mark.2 b/man2/fanotify_mark.2
index ebb327bdd..eb82325b6 100644
--- a/man2/fanotify_mark.2
+++ b/man2/fanotify_mark.2
@@ -240,6 +240,19 @@ directory.
 An fanotify group that identifies filesystem objects by file handles
 is required.
 .TP
+.BR FAN_RENAME " (since Linux 5.17)"
+.\" commit 8cc3b1ccd930fe6971e1527f0c4f1bdc8cb56026
+This event contains the same information provided by events
+.B FAN_MOVED_FROM
+and
+.BR FAN_MOVED_TO ,
+however is represented by a single event with up to two information records.
+An fanotify group that identifies filesystem objects by file handles
+is required.
+If the filesystem object to be marked is not a directory, the error
+.B ENOTDIR
+shall be raised.
+.TP
 .BR FAN_MOVE_SELF " (since Linux 5.1)"
 .\" commit 235328d1fa4251c6dcb32351219bb553a58838d2
 Create an event when a marked file or directory itself has been moved.
@@ -472,6 +485,9 @@ and
 and
 .I pathname
 do not specify a directory.
+This error will also be returned when trying to set the event
+.B FAN_RENAME
+in the mask of a non directory inode mark.
 For an fanotify group that was initialized with flag
 .BR FAN_REPORT_TARGET_FID ,
 this error will also be returned when trying to set directory entry modification
diff --git a/man7/fanotify.7 b/man7/fanotify.7
index 5f2c01408..e08508337 100644
--- a/man7/fanotify.7
+++ b/man7/fanotify.7
@@ -391,6 +391,9 @@ A watched file or directory was deleted.
 .B FAN_FS_ERROR
 A filesystem error was detected.
 .TP
+.B FAN_RENAME
+A file or directory has been moved to or from a watched parent directory.
+.TP
 .B FAN_MOVED_FROM
 A file or directory has been moved from a watched parent directory.
 .TP
@@ -556,6 +559,7 @@ identifying a child object.
 Note that for the directory entry modification events
 .BR FAN_CREATE ,
 .BR FAN_DELETE ,
+.BR FAN_RENAME ,
 and
 .BR FAN_MOVE ,
 an information record identifying the created/deleted/moved child object
-- 
2.25.1