[linux.git] / drivers / md / dm-sysfs.c

/*
 * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
 *
 * This file is released under the GPL.
 */

#include <linux/sysfs.h>
#include <linux/dm-ioctl.h>
#include "dm.h"

struct dm_sysfs_attr {
	struct attribute attr;
	ssize_t (*show)(struct mapped_device *, char *);
	ssize_t (*store)(struct mapped_device *, char *);
};

#define DM_ATTR_RO(_name) \
struct dm_sysfs_attr dm_attr_##_name = \
	__ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)

static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
			    char *page)
{
	struct dm_sysfs_attr *dm_attr;
	struct mapped_device *md;
	ssize_t ret;

	dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
	if (!dm_attr->show)
		return -EIO;

	md = dm_get_from_kobject(kobj);
	if (!md)
		return -EINVAL;

	ret = dm_attr->show(md, page);
	dm_put(md);

	return ret;
}

static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
{
	if (dm_copy_name_and_uuid(md, buf, NULL))
		return -EIO;

	strcat(buf, "\n");
	return strlen(buf);
}

static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
{
	if (dm_copy_name_and_uuid(md, NULL, buf))
		return -EIO;

	strcat(buf, "\n");
	return strlen(buf);
}

static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
{
	sprintf(buf, "%d\n", dm_suspended_md(md));

	return strlen(buf);
}

static DM_ATTR_RO(name);
static DM_ATTR_RO(uuid);
static DM_ATTR_RO(suspended);

static struct attribute *dm_attrs[] = {
	&dm_attr_name.attr,
	&dm_attr_uuid.attr,
	&dm_attr_suspended.attr,
	NULL,
};

static const struct sysfs_ops dm_sysfs_ops = {
	.show	= dm_attr_show,
};

/*
 * dm kobject is embedded in mapped_device structure
 * no need to define release function here
 */
static struct kobj_type dm_ktype = {
	.sysfs_ops	= &dm_sysfs_ops,
	.default_attrs	= dm_attrs,
};

/*
 * Initialize kobj
 * because nobody using md yet, no need to call explicit dm_get/put
 */
int dm_sysfs_init(struct mapped_device *md)
{
	return kobject_init_and_add(dm_kobject(md), &dm_ktype,
				    &disk_to_dev(dm_disk(md))->kobj,
				    "%s", "dm");
}

/*
 * Remove kobj, called after all references removed
 */
void dm_sysfs_exit(struct mapped_device *md)
{
	kobject_put(dm_kobject(md));
}
Commit	Line	Data
784aae73 MB	1	/*
	2	* Copyright (C) 2008 Red Hat, Inc. All rights reserved.
	3	*
	4	* This file is released under the GPL.
	5	*/
	6
	7	#include <linux/sysfs.h>
	8	#include <linux/dm-ioctl.h>
	9	#include "dm.h"
	10
	11	struct dm_sysfs_attr {
	12	struct attribute attr;
	13	ssize_t (show)(struct mapped_device , char *);
	14	ssize_t (store)(struct mapped_device , char *);
	15	};
	16
	17	#define DM_ATTR_RO(_name) \
	18	struct dm_sysfs_attr dm_attr_##_name = \
	19	__ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
	20
	21	static ssize_t dm_attr_show(struct kobject kobj, struct attribute attr,
	22	char *page)
	23	{
	24	struct dm_sysfs_attr *dm_attr;
	25	struct mapped_device *md;
	26	ssize_t ret;
	27
	28	dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
	29	if (!dm_attr->show)
	30	return -EIO;
	31
	32	md = dm_get_from_kobject(kobj);
	33	if (!md)
	34	return -EINVAL;
	35
	36	ret = dm_attr->show(md, page);
	37	dm_put(md);
	38
	39	return ret;
	40	}
	41
	42	static ssize_t dm_attr_name_show(struct mapped_device md, char buf)
	43	{
	44	if (dm_copy_name_and_uuid(md, buf, NULL))
	45	return -EIO;
	46
	47	strcat(buf, "\n");
	48	return strlen(buf);
	49	}
	50
	51	static ssize_t dm_attr_uuid_show(struct mapped_device md, char buf)
	52	{
	53	if (dm_copy_name_and_uuid(md, NULL, buf))
	54	return -EIO;
	55
	56	strcat(buf, "\n");
	57	return strlen(buf);
	58	}
	59
486d220f PR	60	static ssize_t dm_attr_suspended_show(struct mapped_device md, char buf)
486d220f PR	61	{
4f186f8b	62	sprintf(buf, "%d\n", dm_suspended_md(md));
486d220f PR	63
	64	return strlen(buf);
	65	}
	66
784aae73 MB	67	static DM_ATTR_RO(name);
784aae73 MB	68	static DM_ATTR_RO(uuid);
486d220f	69	static DM_ATTR_RO(suspended);
784aae73 MB	70
	71	static struct attribute *dm_attrs[] = {
	72	&dm_attr_name.attr,
	73	&dm_attr_uuid.attr,
486d220f	74	&dm_attr_suspended.attr,
784aae73 MB	75	NULL,
	76	};
	77
52cf25d0	78	static const struct sysfs_ops dm_sysfs_ops = {
784aae73 MB	79	.show = dm_attr_show,
	80	};
	81
	82	/*
	83	* dm kobject is embedded in mapped_device structure
	84	* no need to define release function here
	85	*/
	86	static struct kobj_type dm_ktype = {
	87	.sysfs_ops = &dm_sysfs_ops,
	88	.default_attrs = dm_attrs,
	89	};
	90
	91	/*
	92	* Initialize kobj
	93	* because nobody using md yet, no need to call explicit dm_get/put
	94	*/
	95	int dm_sysfs_init(struct mapped_device *md)
	96	{
	97	return kobject_init_and_add(dm_kobject(md), &dm_ktype,
	98	&disk_to_dev(dm_disk(md))->kobj,
	99	"%s", "dm");
	100	}
	101
	102	/*
	103	* Remove kobj, called after all references removed
	104	*/
	105	void dm_sysfs_exit(struct mapped_device *md)
	106	{
	107	kobject_put(dm_kobject(md));
	108	}