2 * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
4 * This file is released under the GPL.
7 #include <linux/sysfs.h>
8 #include <linux/dm-ioctl.h>
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 *);
17 #define DM_ATTR_RO(_name) \
18 struct dm_sysfs_attr dm_attr_##_name = \
19 __ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
21 static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
24 struct dm_sysfs_attr *dm_attr;
25 struct mapped_device *md;
28 dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
32 md = dm_get_from_kobject(kobj);
36 ret = dm_attr->show(md, page);
42 static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
44 if (dm_copy_name_and_uuid(md, buf, NULL))
51 static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
53 if (dm_copy_name_and_uuid(md, NULL, buf))
60 static DM_ATTR_RO(name);
61 static DM_ATTR_RO(uuid);
63 static struct attribute *dm_attrs[] = {
69 static struct sysfs_ops dm_sysfs_ops = {
74 * dm kobject is embedded in mapped_device structure
75 * no need to define release function here
77 static struct kobj_type dm_ktype = {
78 .sysfs_ops = &dm_sysfs_ops,
79 .default_attrs = dm_attrs,
84 * because nobody using md yet, no need to call explicit dm_get/put
86 int dm_sysfs_init(struct mapped_device *md)
88 return kobject_init_and_add(dm_kobject(md), &dm_ktype,
89 &disk_to_dev(dm_disk(md))->kobj,
94 * Remove kobj, called after all references removed
96 void dm_sysfs_exit(struct mapped_device *md)
98 kobject_put(dm_kobject(md));