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autofs: add AUTOFS_EXP_FORCED flag

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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>
This commit is contained in:
Ian Kent
2018-08-21 21:59:01 -07:00
committed by Linus Torvalds
parent e5c85e1fe1
commit cbf6898fd6
2 changed files with 55 additions and 15 deletions
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8
include/uapi/linux/auto_fs.h
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@@ -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