linux-kernel - [PATCH v5 2/2] lockd: change the proc_handler for nsm_use

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Message-Id: <1481786661-973-3-git-send-email-hejianet@gmail.com>
Date:   Thu, 15 Dec 2016 15:24:21 +0800
From:   Jia He <hejianet@...il.com>
To:     linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Serge Hallyn <serge@...lyn.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Kees Cook <keescook@...omium.org>,
        Hugh Dickins <hughd@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Daniel Cashman <dcashman@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...chiereds.net>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Jia He <hejianet@...il.com>
Subject: [PATCH v5 2/2] lockd: change the proc_handler for nsm_use_hostnames

nsm_use_hostnames is a module parameter and it will be exported to sysctl
procfs. This is to let user sometimes change it from userspace. But the
minimal unit for sysctl procfs read/write it sizeof(int).
In big endian system, the converting from/to  bool to/from int will cause
error for proc items.

This patch use a new proc_handler proc_dobool to fixe it.

Signed-off-by: Jia He <hejianet@...il.com>
---
 fs/lockd/svc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index fc4084e..bd6fcf9 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -561,7 +561,7 @@ static struct ctl_table nlm_sysctls[] = {
 		.data		= &nsm_use_hostnames,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dobool,
 	},
 	{
 		.procname	= "nsm_local_state",
-- 
2.5.5