fs: move inode sysctls to its own file

The kernel/sysctl.c is a kitchen sink where everyone leaves
their dirty dishes, this makes it very difficult to maintain.

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 the inode sysctls to its own file. Since we are no longer
using this outside of fs/ remove the extern declaration of
its respective proc helper.

We use early_initcall() as it is the earliest we can use.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

3 files changed, 28 insertions, 18 deletions

diff --git a/fs/inode.c b/fs/inode.c
index 6b80a51129d56..095c64e7c0b14 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -106,13 +106,38 @@ long get_nr_dirty_inodes(void)
  * Handle nr_inode sysctl
  */
 #ifdef CONFIG_SYSCTL
-int proc_nr_inodes(struct ctl_table *table, int write,
-		   void *buffer, size_t *lenp, loff_t *ppos)
+static int proc_nr_inodes(struct ctl_table *table, int write, void *buffer,
+			  size_t *lenp, loff_t *ppos)
 {
 	inodes_stat.nr_inodes = get_nr_inodes();
 	inodes_stat.nr_unused = get_nr_inodes_unused();
 	return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 }
+
+static struct ctl_table inodes_sysctls[] = {
+	{
+		.procname	= "inode-nr",
+		.data		= &inodes_stat,
+		.maxlen		= 2*sizeof(long),
+		.mode		= 0444,
+		.proc_handler	= proc_nr_inodes,
+	},
+	{
+		.procname	= "inode-state",
+		.data		= &inodes_stat,
+		.maxlen		= 7*sizeof(long),
+		.mode		= 0444,
+		.proc_handler	= proc_nr_inodes,
+	},
+	{ }
+};
+
+static int __init init_fs_inode_sysctls(void)
+{
+	register_sysctl_init("fs", inodes_sysctls, "inodes");
+	return 0;
+}
+early_initcall(init_fs_inode_sysctls);
 #endif
 
 static int no_open(struct inode *inode, struct file *file)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index bbf812ce89a8c..93560bfb36642 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3595,9 +3595,8 @@ int proc_nr_files(struct ctl_table *table, int write,
 		  void *buffer, size_t *lenp, loff_t *ppos);
 int proc_nr_dentry(struct ctl_table *table, int write,
 		  void *buffer, size_t *lenp, loff_t *ppos);
-int proc_nr_inodes(struct ctl_table *table, int write,
-		   void *buffer, size_t *lenp, loff_t *ppos);
 int __init list_bdev_fs_names(char *buf, size_t size);
+int __init get_filesystem_list(char *buf);
 
 #define __FMODE_EXEC		((__force int) FMODE_EXEC)
 #define __FMODE_NONOTIFY	((__force int) FMODE_NONOTIFY)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index b8a3dcf7b9257..7fc708fd10b43 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2901,20 +2901,6 @@ static struct ctl_table vm_table[] = {
 
 static struct ctl_table fs_table[] = {
 	{
-		.procname	= "inode-nr",
-		.data		= &inodes_stat,
-		.maxlen		= 2*sizeof(long),
-		.mode		= 0444,
-		.proc_handler	= proc_nr_inodes,
-	},
-	{
-		.procname	= "inode-state",
-		.data		= &inodes_stat,
-		.maxlen		= 7*sizeof(long),
-		.mode		= 0444,
-		.proc_handler	= proc_nr_inodes,
-	},
-	{
 		.procname	= "file-nr",
 		.data		= &files_stat,
 		.maxlen		= sizeof(files_stat),