linux-kernel - Re: [PATCH v2 6/8] inotify: simplify subdirectory registration with register

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Date:   Wed, 24 Nov 2021 05:40:58 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Jan Kara <jack@...e.cz>
Cc:     akpm@...ux-foundation.org, keescook@...omium.org,
        yzaikin@...gle.com, nixiaoming@...wei.com, ebiederm@...ssion.com,
        clemens@...isch.de, arnd@...db.de, gregkh@...uxfoundation.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...ux.ie, benh@...nel.crashing.org, mark@...heh.com,
        jlbec@...lplan.org, joseph.qi@...ux.alibaba.com,
        amir73il@...il.com, phil@...lpotter.co.uk, viro@...iv.linux.org.uk,
        julia.lawall@...ia.fr, ocfs2-devel@....oracle.com,
        linuxppc-dev@...ts.ozlabs.org, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/8] inotify: simplify subdirectory registration with
 register_sysctl()

On Wed, Nov 24, 2021 at 10:44:09AM +0100, Jan Kara wrote:
> On Tue 23-11-21 12:24:20, Luis Chamberlain wrote:
> > From: Xiaoming Ni <nixiaoming@...wei.com>
> > 
> > There is no need to user boiler plate code to specify a set of base
> > directories we're going to stuff sysctls under. Simplify this by using
> > register_sysctl() and specifying the directory path directly.
> > 
> > Move inotify_user sysctl to inotify_user.c while at it to remove clutter
> > from kernel/sysctl.c.
> > 
> > Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
> > [mcgrof: update commit log to reflect new path we decided to take]
> > Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> 
> This looks fishy. You register inotify_table but not fanotify_table and
> remove both...

Indeed, the following was missing, I'll roll it in:

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 559bc1e9926d..a35693eb1f36 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -59,7 +59,7 @@ static int fanotify_max_queued_events __read_mostly;
 static long ft_zero = 0;
 static long ft_int_max = INT_MAX;
 
-struct ctl_table fanotify_table[] = {
+static struct ctl_table fanotify_table[] = {
 	{
 		.procname	= "max_user_groups",
 		.data	= &init_user_ns.ucount_max[UCOUNT_FANOTIFY_GROUPS],
@@ -88,6 +88,13 @@ struct ctl_table fanotify_table[] = {
 	},
 	{ }
 };
+
+static void __init fanotify_sysctls_init(void)
+{
+	register_sysctl("fs/fanotify", fanotify_table);
+}
+#else
+#define fanotify_sysctls_init() do { } while (0)
 #endif /* CONFIG_SYSCTL */
 
 /*
@@ -1685,6 +1692,7 @@ static int __init fanotify_user_setup(void)
 	init_user_ns.ucount_max[UCOUNT_FANOTIFY_GROUPS] =
 					FANOTIFY_DEFAULT_MAX_GROUPS;
 	init_user_ns.ucount_max[UCOUNT_FANOTIFY_MARKS] = max_marks;
+	fanotify_sysctls_init();
 
 	return 0;
 }
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index 616af2ea20f3..556cc63c88ee 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -5,8 +5,6 @@
 #include <linux/sysctl.h>
 #include <uapi/linux/fanotify.h>
 
-extern struct ctl_table fanotify_table[]; /* for sysctl */
-
 #define FAN_GROUP_FLAG(group, flag) \
 	((group)->fanotify_data.flags & (flag))