[net-next-2.6.git] / kernel / ksysfs.c

/*
 * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
 * 		     are not related to any other subsystem
 *
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 * 
 * This file is release under the GPLv2
 *
 */

#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kexec.h>

#define KERNEL_ATTR_RO(_name) \
static struct subsys_attribute _name##_attr = __ATTR_RO(_name)

#define KERNEL_ATTR_RW(_name) \
static struct subsys_attribute _name##_attr = \
	__ATTR(_name, 0644, _name##_show, _name##_store)

#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
/* current uevent sequence number */
static ssize_t uevent_seqnum_show(struct kset *kset, char *page)
{
	return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum);
}
KERNEL_ATTR_RO(uevent_seqnum);

/* uevent helper program, used during early boo */
static ssize_t uevent_helper_show(struct kset *kset, char *page)
{
	return sprintf(page, "%s\n", uevent_helper);
}
static ssize_t uevent_helper_store(struct kset *kset, const char *page, size_t count)
{
	if (count+1 > UEVENT_HELPER_PATH_LEN)
		return -ENOENT;
	memcpy(uevent_helper, page, count);
	uevent_helper[count] = '\0';
	if (count && uevent_helper[count-1] == '\n')
		uevent_helper[count-1] = '\0';
	return count;
}
KERNEL_ATTR_RW(uevent_helper);
#endif

#ifdef CONFIG_KEXEC
static ssize_t kexec_loaded_show(struct kset *kset, char *page)
{
	return sprintf(page, "%d\n", !!kexec_image);
}
KERNEL_ATTR_RO(kexec_loaded);

static ssize_t kexec_crash_loaded_show(struct kset *kset, char *page)
{
	return sprintf(page, "%d\n", !!kexec_crash_image);
}
KERNEL_ATTR_RO(kexec_crash_loaded);
#endif /* CONFIG_KEXEC */

/*
 * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
 */
extern const char __start_notes __attribute__((weak));
extern const char __stop_notes __attribute__((weak));
#define	notes_size (&__stop_notes - &__start_notes)

static ssize_t notes_read(struct kobject *kobj, struct bin_attribute *bin_attr,
			  char *buf, loff_t off, size_t count)
{
	memcpy(buf, &__start_notes + off, count);
	return count;
}

static struct bin_attribute notes_attr = {
	.attr = {
		.name = "notes",
		.mode = S_IRUGO,
	},
	.read = &notes_read,
};

decl_subsys(kernel, NULL, NULL);
EXPORT_SYMBOL_GPL(kernel_subsys);

static struct attribute * kernel_attrs[] = {
#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
	&uevent_seqnum_attr.attr,
	&uevent_helper_attr.attr,
#endif
#ifdef CONFIG_KEXEC
	&kexec_loaded_attr.attr,
	&kexec_crash_loaded_attr.attr,
#endif
	NULL
};

static struct attribute_group kernel_attr_group = {
	.attrs = kernel_attrs,
};

static int __init ksysfs_init(void)
{
	int error = subsystem_register(&kernel_subsys);
	if (!error)
		error = sysfs_create_group(&kernel_subsys.kobj,
					   &kernel_attr_group);

	if (!error && notes_size > 0) {
		notes_attr.size = notes_size;
		error = sysfs_create_bin_file(&kernel_subsys.kobj,
					      &notes_attr);
	}

	return error;
}

core_initcall(ksysfs_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
	3	* are not related to any other subsystem
	4	*
	5	* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
	6	*
	7	* This file is release under the GPLv2
	8	*
	9	*/
	10
1da177e4 LT	11	#include <linux/kobject.h>
	12	#include <linux/string.h>
	13	#include <linux/sysfs.h>
	14	#include <linux/module.h>
	15	#include <linux/init.h>
c330dda9	16	#include <linux/kexec.h>
1da177e4 LT	17
	18	#define KERNEL_ATTR_RO(_name) \
	19	static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
	20
	21	#define KERNEL_ATTR_RW(_name) \
	22	static struct subsys_attribute _name##_attr = \
	23	__ATTR(_name, 0644, _name##_show, _name##_store)
	24
f125b561	25	#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
0f76e5ac	26	/* current uevent sequence number */
823bccfc	27	static ssize_t uevent_seqnum_show(struct kset kset, char page)
1da177e4	28	{
312c004d	29	return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum);
1da177e4	30	}
0f76e5ac KS	31	KERNEL_ATTR_RO(uevent_seqnum);
	32
	33	/* uevent helper program, used during early boo */
823bccfc	34	static ssize_t uevent_helper_show(struct kset kset, char page)
0f76e5ac	35	{
312c004d	36	return sprintf(page, "%s\n", uevent_helper);
0f76e5ac	37	}
823bccfc	38	static ssize_t uevent_helper_store(struct kset kset, const char page, size_t count)
0f76e5ac	39	{
312c004d	40	if (count+1 > UEVENT_HELPER_PATH_LEN)
0f76e5ac	41	return -ENOENT;
312c004d KS	42	memcpy(uevent_helper, page, count);
	43	uevent_helper[count] = '\0';
	44	if (count && uevent_helper[count-1] == '\n')
	45	uevent_helper[count-1] = '\0';
0f76e5ac KS	46	return count;
	47	}
	48	KERNEL_ATTR_RW(uevent_helper);
1da177e4 LT	49	#endif
1da177e4 LT	50
c330dda9	51	#ifdef CONFIG_KEXEC
823bccfc	52	static ssize_t kexec_loaded_show(struct kset kset, char page)
c330dda9 JM	53	{
	54	return sprintf(page, "%d\n", !!kexec_image);
	55	}
	56	KERNEL_ATTR_RO(kexec_loaded);
	57
823bccfc	58	static ssize_t kexec_crash_loaded_show(struct kset kset, char page)
c330dda9 JM	59	{
	60	return sprintf(page, "%d\n", !!kexec_crash_image);
	61	}
	62	KERNEL_ATTR_RO(kexec_crash_loaded);
	63	#endif /* CONFIG_KEXEC */
	64
da1a679c RM	65	/*
	66	* Make /sys/kernel/notes give the raw contents of our kernel .notes section.
	67	*/
	68	extern const char __start_notes __attribute__((weak));
	69	extern const char __stop_notes __attribute__((weak));
	70	#define notes_size (&__stop_notes - &__start_notes)
	71
	72	static ssize_t notes_read(struct kobject kobj, struct bin_attribute bin_attr,
	73	char *buf, loff_t off, size_t count)
	74	{
	75	memcpy(buf, &__start_notes + off, count);
	76	return count;
	77	}
	78
	79	static struct bin_attribute notes_attr = {
	80	.attr = {
	81	.name = "notes",
	82	.mode = S_IRUGO,
	83	},
	84	.read = &notes_read,
	85	};
	86
1da177e4 LT	87	decl_subsys(kernel, NULL, NULL);
	88	EXPORT_SYMBOL_GPL(kernel_subsys);
	89
	90	static struct attribute * kernel_attrs[] = {
f125b561	91	#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
0f76e5ac KS	92	&uevent_seqnum_attr.attr,
0f76e5ac KS	93	&uevent_helper_attr.attr,
c330dda9 JM	94	#endif
	95	#ifdef CONFIG_KEXEC
	96	&kexec_loaded_attr.attr,
	97	&kexec_crash_loaded_attr.attr,
1da177e4 LT	98	#endif
	99	NULL
	100	};
	101
	102	static struct attribute_group kernel_attr_group = {
	103	.attrs = kernel_attrs,
	104	};
	105
	106	static int __init ksysfs_init(void)
	107	{
	108	int error = subsystem_register(&kernel_subsys);
	109	if (!error)
823bccfc	110	error = sysfs_create_group(&kernel_subsys.kobj,
1da177e4 LT	111	&kernel_attr_group);
1da177e4 LT	112
da1a679c RM	113	if (!error && notes_size > 0) {
	114	notes_attr.size = notes_size;
	115	error = sysfs_create_bin_file(&kernel_subsys.kobj,
	116	&notes_attr);
	117	}
	118
1da177e4 LT	119	return error;
	120	}
	121
	122	core_initcall(ksysfs_init);