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
 11struct 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) \
 18struct dm_sysfs_attr dm_attr_##_name = \
 19	__ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
 20
 21static 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
 42static 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
 51static 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
 60static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
 61{
 62	sprintf(buf, "%d\n", dm_suspended_md(md));
 63
 64	return strlen(buf);
 65}
 66
 67static DM_ATTR_RO(name);
 68static DM_ATTR_RO(uuid);
 69static DM_ATTR_RO(suspended);
 70
 71static struct attribute *dm_attrs[] = {
 72	&dm_attr_name.attr,
 73	&dm_attr_uuid.attr,
 74	&dm_attr_suspended.attr,
 75	NULL,
 76};
 77
 78static const struct sysfs_ops dm_sysfs_ops = {
 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 */
 86static 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 */
 95int 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 */
105void dm_sysfs_exit(struct mapped_device *md)
106{
107	kobject_put(dm_kobject(md));
 
 
108}

  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
 11struct 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) \
 18struct dm_sysfs_attr dm_attr_##_name = \
 19	__ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
 20
 21static 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
 42static 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
 51static 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
 60static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
 61{
 62	sprintf(buf, "%d\n", dm_suspended_md(md));
 63
 64	return strlen(buf);
 65}
 66
 67static DM_ATTR_RO(name);
 68static DM_ATTR_RO(uuid);
 69static DM_ATTR_RO(suspended);
 70
 71static struct attribute *dm_attrs[] = {
 72	&dm_attr_name.attr,
 73	&dm_attr_uuid.attr,
 74	&dm_attr_suspended.attr,
 75	NULL,
 76};
 77
 78static const struct sysfs_ops dm_sysfs_ops = {
 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 */
 86static struct kobj_type dm_ktype = {
 87	.sysfs_ops	= &dm_sysfs_ops,
 88	.default_attrs	= dm_attrs,
 89	.release	= dm_kobject_release,
 90};
 91
 92/*
 93 * Initialize kobj
 94 * because nobody using md yet, no need to call explicit dm_get/put
 95 */
 96int dm_sysfs_init(struct mapped_device *md)
 97{
 98	return kobject_init_and_add(dm_kobject(md), &dm_ktype,
 99				    &disk_to_dev(dm_disk(md))->kobj,
100				    "%s", "dm");
101}
102
103/*
104 * Remove kobj, called after all references removed
105 */
106void dm_sysfs_exit(struct mapped_device *md)
107{
108	struct kobject *kobj = dm_kobject(md);
109	kobject_put(kobj);
110	wait_for_completion(dm_get_completion_from_kobject(kobj));
111}