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 ssize_t
dm_attr_suspended_show(struct mapped_device
*md
, char *buf
)
62 sprintf(buf
, "%d\n", dm_suspended(md
));
67 static DM_ATTR_RO(name
);
68 static DM_ATTR_RO(uuid
);
69 static DM_ATTR_RO(suspended
);
71 static struct attribute
*dm_attrs
[] = {
74 &dm_attr_suspended
.attr
,
78 static struct sysfs_ops dm_sysfs_ops
= {
83 * dm kobject is embedded in mapped_device structure
84 * no need to define release function here
86 static struct kobj_type dm_ktype
= {
87 .sysfs_ops
= &dm_sysfs_ops
,
88 .default_attrs
= dm_attrs
,
93 * because nobody using md yet, no need to call explicit dm_get/put
95 int dm_sysfs_init(struct mapped_device
*md
)
97 return kobject_init_and_add(dm_kobject(md
), &dm_ktype
,
98 &disk_to_dev(dm_disk(md
))->kobj
,
103 * Remove kobj, called after all references removed
105 void dm_sysfs_exit(struct mapped_device
*md
)
107 kobject_put(dm_kobject(md
));
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