fs: move shared sysctls to fs/sysctls.c

To help with this maintenance let's start by moving sysctls to places
where they actually belong.  The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we
just care about the core logic.

To help with this maintenance let's start by moving sysctls to places
where they actually belong.  The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we
just care about the core logic.

So move sysctls which are shared between filesystems into a common file
outside of kernel/sysctl.c.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Luis Chamberlain <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Antti Palosaari <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: Iurii Zaikin <[email protected]>
Cc: "J. Bruce Fields" <[email protected]>
Cc: Jeff Layton <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Lukas Middendorf <[email protected]>
Cc: Stephen Kitt <[email protected]>
Cc: Xiaoming Ni <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

3 files changed, 39 insertions, 18 deletions

diff --git a/fs/Makefile b/fs/Makefile
index 84c5e4cdfee5..ea8770d124da 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -28,6 +28,7 @@ obj-y				+= notify/
 obj-$(CONFIG_EPOLL)		+= eventpoll.o
 obj-y				+= anon_inodes.o
 obj-$(CONFIG_SIGNALFD)		+= signalfd.o
+obj-$(CONFIG_SYSCTL)		+= sysctls.o
 obj-$(CONFIG_TIMERFD)		+= timerfd.o
 obj-$(CONFIG_EVENTFD)		+= eventfd.o
 obj-$(CONFIG_USERFAULTFD)	+= userfaultfd.o
diff --git a/fs/sysctls.c b/fs/sysctls.c
new file mode 100644
index 000000000000..54216cd1ecd7
--- /dev/null
+++ b/fs/sysctls.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * /proc/sys/fs shared sysctls
+ *
+ * These sysctls are shared between different filesystems.
+ */
+#include <linux/init.h>
+#include <linux/sysctl.h>
+
+static struct ctl_table fs_shared_sysctls[] = {
+	{
+		.procname	= "overflowuid",
+		.data		= &fs_overflowuid,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_MAXOLDUID,
+	},
+	{
+		.procname	= "overflowgid",
+		.data		= &fs_overflowgid,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_MAXOLDUID,
+	},
+	{ }
+};
+
+static int __init init_fs_shared_sysctls(void)
+{
+	register_sysctl_init("fs", fs_shared_sysctls);
+	return 0;
+}
+
+early_initcall(init_fs_shared_sysctls);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5bbb4c59dd1a..6d9d2001b790 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2897,24 +2897,6 @@ static struct ctl_table vm_table[] = {
 };
 
 static struct ctl_table fs_table[] = {
-	{
-		.procname	= "overflowuid",
-		.data		= &fs_overflowuid,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= SYSCTL_MAXOLDUID,
-	},
-	{
-		.procname	= "overflowgid",
-		.data		= &fs_overflowgid,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= SYSCTL_MAXOLDUID,
-	},
 #ifdef CONFIG_FILE_LOCKING
 	{
 		.procname	= "leases-enable",