From cbf6898fd69455092c43cd573b38d42c86ddb1e0 Mon Sep 17 00:00:00 2001
From: Ian Kent <raven@themaw.net>
Date: Tue, 21 Aug 2018 21:59:01 -0700
Subject: autofs: add AUTOFS_EXP_FORCED flag

The userspace automount(8) daemon is meant to perform a forced expire when
sent a SIGUSR2.

But since the expiration is routed through the kernel and the kernel
doesn't send an expire request if the mount is busy this hasn't worked at
least since autofs version 5.

Add an AUTOFS_EXP_FORCED flag to allow implemention of the feature and
bump the protocol version so user space can check if it's implemented if
needed.

Link: http://lkml.kernel.org/r/152937734715.21213.6594007182776598970.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/uapi/linux/auto_fs.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'include')

diff --git a/include/uapi/linux/auto_fs.h b/include/uapi/linux/auto_fs.h
index e13eec3dfb2f..df31aa9c9a8c 100644
--- a/include/uapi/linux/auto_fs.h
+++ b/include/uapi/linux/auto_fs.h
@@ -23,7 +23,7 @@
 #define AUTOFS_MIN_PROTO_VERSION	3
 #define AUTOFS_MAX_PROTO_VERSION	5
 
-#define AUTOFS_PROTO_SUBVERSION		2
+#define AUTOFS_PROTO_SUBVERSION		3
 
 /*
  * The wait_queue_token (autofs_wqt_t) is part of a structure which is passed
@@ -90,8 +90,10 @@ enum {
 /* autofs version 4 and later definitions */
 
 /* Mask for expire behaviour */
-#define AUTOFS_EXP_IMMEDIATE		1
-#define AUTOFS_EXP_LEAVES		2
+#define AUTOFS_EXP_NORMAL		0x00
+#define AUTOFS_EXP_IMMEDIATE		0x01
+#define AUTOFS_EXP_LEAVES		0x02
+#define AUTOFS_EXP_FORCED		0x04
 
 #define AUTOFS_TYPE_ANY			0U
 #define AUTOFS_TYPE_INDIRECT		1U
-- 
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