[linux-block.git] / lib / test_sysctl.c

/*
 * proc sysctl test driver
 *
 * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or at your option any
 * later version; or, when distributed separately from the Linux kernel or
 * when incorporated into other software packages, subject to the following
 * license:
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of copyleft-next (version 0.3.1 or later) as published
 * at http://copyleft-next.org/.
 */

/*
 * This module provides an interface to the the proc sysctl interfaces.  This
 * driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
 * system unless explicitly requested by name. You can also build this driver
 * into your kernel.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/async.h>
#include <linux/delay.h>
#include <linux/vmalloc.h>

static int i_zero;
static int i_one_hundred = 100;

struct test_sysctl_data {
	int int_0001;
	int int_0002;
	int int_0003[4];

	int boot_int;

	unsigned int uint_0001;

	char string_0001[65];

#define SYSCTL_TEST_BITMAP_SIZE	65536
	unsigned long *bitmap_0001;
};

static struct test_sysctl_data test_data = {
	.int_0001 = 60,
	.int_0002 = 1,

	.int_0003[0] = 0,
	.int_0003[1] = 1,
	.int_0003[2] = 2,
	.int_0003[3] = 3,

	.boot_int = 0,

	.uint_0001 = 314,

	.string_0001 = "(none)",
};

/* These are all under /proc/sys/debug/test_sysctl/ */
static struct ctl_table test_table[] = {
	{
		.procname	= "int_0001",
		.data		= &test_data.int_0001,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &i_zero,
		.extra2         = &i_one_hundred,
	},
	{
		.procname	= "int_0002",
		.data		= &test_data.int_0002,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "int_0003",
		.data		= &test_data.int_0003,
		.maxlen		= sizeof(test_data.int_0003),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "boot_int",
		.data		= &test_data.boot_int,
		.maxlen		= sizeof(test_data.boot_int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= SYSCTL_ZERO,
		.extra2         = SYSCTL_ONE,
	},
	{
		.procname	= "uint_0001",
		.data		= &test_data.uint_0001,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_douintvec,
	},
	{
		.procname	= "string_0001",
		.data		= &test_data.string_0001,
		.maxlen		= sizeof(test_data.string_0001),
		.mode		= 0644,
		.proc_handler	= proc_dostring,
	},
	{
		.procname	= "bitmap_0001",
		.data		= &test_data.bitmap_0001,
		.maxlen		= SYSCTL_TEST_BITMAP_SIZE,
		.mode		= 0644,
		.proc_handler	= proc_do_large_bitmap,
	},
	{ }
};

static struct ctl_table test_sysctl_table[] = {
	{
		.procname	= "test_sysctl",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= test_table,
	},
	{ }
};

static struct ctl_table test_sysctl_root_table[] = {
	{
		.procname	= "debug",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= test_sysctl_table,
	},
	{ }
};

static struct ctl_table_header *test_sysctl_header;

static int __init test_sysctl_init(void)
{
	test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
	if (!test_data.bitmap_0001)
		return -ENOMEM;
	test_sysctl_header = register_sysctl_table(test_sysctl_root_table);
	if (!test_sysctl_header) {
		kfree(test_data.bitmap_0001);
		return -ENOMEM;
	}
	return 0;
}
module_init(test_sysctl_init);

static void __exit test_sysctl_exit(void)
{
	kfree(test_data.bitmap_0001);
	if (test_sysctl_header)
		unregister_sysctl_table(test_sysctl_header);
}

module_exit(test_sysctl_exit);

MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
MODULE_LICENSE("GPL");
Commit	Line	Data
9308f2f9 LR	1	/*
	2	* proc sysctl test driver
	3	*
	4	* Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or at your option any
	9	* later version; or, when distributed separately from the Linux kernel or
	10	* when incorporated into other software packages, subject to the following
	11	* license:
	12	*
	13	* This program is free software; you can redistribute it and/or modify it
	14	* under the terms of copyleft-next (version 0.3.1 or later) as published
	15	* at http://copyleft-next.org/.
	16	*/
	17
	18	/*
	19	* This module provides an interface to the the proc sysctl interfaces. This
	20	* driver requires CONFIG_PROC_SYSCTL. It will not normally be loaded by the
	21	* system unless explicitly requested by name. You can also build this driver
	22	* into your kernel.
	23	*/
	24
	25	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	26
	27	#include <linux/init.h>
	28	#include <linux/list.h>
	29	#include <linux/module.h>
	30	#include <linux/printk.h>
	31	#include <linux/fs.h>
	32	#include <linux/miscdevice.h>
	33	#include <linux/slab.h>
	34	#include <linux/uaccess.h>
	35	#include <linux/async.h>
	36	#include <linux/delay.h>
	37	#include <linux/vmalloc.h>
	38
	39	static int i_zero;
	40	static int i_one_hundred = 100;
	41
	42	struct test_sysctl_data {
	43	int int_0001;
eb965eda	44	int int_0002;
7c43a657	45	int int_0003[4];
eb965eda	46
4f2f682d VB	47	int boot_int;
4f2f682d VB	48
2920fad3 LR	49	unsigned int uint_0001;
2920fad3 LR	50
9308f2f9	51	char string_0001[65];
2ea622b8 ES	52
	53	#define SYSCTL_TEST_BITMAP_SIZE 65536
	54	unsigned long *bitmap_0001;
9308f2f9 LR	55	};
	56
	57	static struct test_sysctl_data test_data = {
	58	.int_0001 = 60,
eb965eda LR	59	.int_0002 = 1,
eb965eda LR	60
7c43a657 LR	61	.int_0003[0] = 0,
	62	.int_0003[1] = 1,
	63	.int_0003[2] = 2,
	64	.int_0003[3] = 3,
	65
4f2f682d VB	66	.boot_int = 0,
4f2f682d VB	67
2920fad3 LR	68	.uint_0001 = 314,
2920fad3 LR	69
9308f2f9 LR	70	.string_0001 = "(none)",
	71	};
	72
	73	/* These are all under /proc/sys/debug/test_sysctl/ */
	74	static struct ctl_table test_table[] = {
	75	{
	76	.procname = "int_0001",
	77	.data = &test_data.int_0001,
	78	.maxlen = sizeof(int),
	79	.mode = 0644,
	80	.proc_handler = proc_dointvec_minmax,
	81	.extra1 = &i_zero,
	82	.extra2 = &i_one_hundred,
	83	},
eb965eda LR	84	{
	85	.procname = "int_0002",
	86	.data = &test_data.int_0002,
	87	.maxlen = sizeof(int),
	88	.mode = 0644,
	89	.proc_handler = proc_dointvec,
	90	},
7c43a657 LR	91	{
	92	.procname = "int_0003",
	93	.data = &test_data.int_0003,
	94	.maxlen = sizeof(test_data.int_0003),
	95	.mode = 0644,
	96	.proc_handler = proc_dointvec,
	97	},
4f2f682d VB	98	{
	99	.procname = "boot_int",
	100	.data = &test_data.boot_int,
	101	.maxlen = sizeof(test_data.boot_int),
	102	.mode = 0644,
	103	.proc_handler = proc_dointvec,
	104	.extra1 = SYSCTL_ZERO,
	105	.extra2 = SYSCTL_ONE,
	106	},
2920fad3 LR	107	{
	108	.procname = "uint_0001",
	109	.data = &test_data.uint_0001,
	110	.maxlen = sizeof(unsigned int),
	111	.mode = 0644,
	112	.proc_handler = proc_douintvec,
	113	},
9308f2f9 LR	114	{
	115	.procname = "string_0001",
	116	.data = &test_data.string_0001,
	117	.maxlen = sizeof(test_data.string_0001),
	118	.mode = 0644,
	119	.proc_handler = proc_dostring,
	120	},
2ea622b8 ES	121	{
	122	.procname = "bitmap_0001",
	123	.data = &test_data.bitmap_0001,
	124	.maxlen = SYSCTL_TEST_BITMAP_SIZE,
	125	.mode = 0644,
	126	.proc_handler = proc_do_large_bitmap,
	127	},
9308f2f9 LR	128	{ }
	129	};
	130
	131	static struct ctl_table test_sysctl_table[] = {
	132	{
	133	.procname = "test_sysctl",
	134	.maxlen = 0,
	135	.mode = 0555,
	136	.child = test_table,
	137	},
	138	{ }
	139	};
	140
	141	static struct ctl_table test_sysctl_root_table[] = {
	142	{
	143	.procname = "debug",
	144	.maxlen = 0,
	145	.mode = 0555,
	146	.child = test_sysctl_table,
	147	},
	148	{ }
	149	};
	150
	151	static struct ctl_table_header *test_sysctl_header;
	152
	153	static int __init test_sysctl_init(void)
	154	{
2ea622b8 ES	155	test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
	156	if (!test_data.bitmap_0001)
	157	return -ENOMEM;
9308f2f9	158	test_sysctl_header = register_sysctl_table(test_sysctl_root_table);
2ea622b8 ES	159	if (!test_sysctl_header) {
2ea622b8 ES	160	kfree(test_data.bitmap_0001);
9308f2f9	161	return -ENOMEM;
2ea622b8	162	}
9308f2f9 LR	163	return 0;
9308f2f9 LR	164	}
2f56f845	165	module_init(test_sysctl_init);
9308f2f9 LR	166
	167	static void __exit test_sysctl_exit(void)
	168	{
2ea622b8	169	kfree(test_data.bitmap_0001);
9308f2f9 LR	170	if (test_sysctl_header)
	171	unregister_sysctl_table(test_sysctl_header);
	172	}
	173
	174	module_exit(test_sysctl_exit);
	175
	176	MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
	177	MODULE_LICENSE("GPL");