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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 *, const char *, size_t count);
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
42#define DM_ATTR_RW(_name) \
43struct dm_sysfs_attr dm_attr_##_name = \
44 __ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store)
45
46static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr,
47 const char *page, size_t count)
48{
49 struct dm_sysfs_attr *dm_attr;
50 struct mapped_device *md;
51 ssize_t ret;
52
53 dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
54 if (!dm_attr->store)
55 return -EIO;
56
57 md = dm_get_from_kobject(kobj);
58 if (!md)
59 return -EINVAL;
60
61 ret = dm_attr->store(md, page, count);
62 dm_put(md);
63
64 return ret;
65}
66
67static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
68{
69 if (dm_copy_name_and_uuid(md, buf, NULL))
70 return -EIO;
71
72 strcat(buf, "\n");
73 return strlen(buf);
74}
75
76static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
77{
78 if (dm_copy_name_and_uuid(md, NULL, buf))
79 return -EIO;
80
81 strcat(buf, "\n");
82 return strlen(buf);
83}
84
85static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
86{
87 sprintf(buf, "%d\n", dm_suspended_md(md));
88
89 return strlen(buf);
90}
91
92static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
93{
94 sprintf(buf, "%d\n", dm_use_blk_mq(md));
95
96 return strlen(buf);
97}
98
99static DM_ATTR_RO(name);
100static DM_ATTR_RO(uuid);
101static DM_ATTR_RO(suspended);
102static DM_ATTR_RO(use_blk_mq);
103static DM_ATTR_RW(rq_based_seq_io_merge_deadline);
104
105static struct attribute *dm_attrs[] = {
106 &dm_attr_name.attr,
107 &dm_attr_uuid.attr,
108 &dm_attr_suspended.attr,
109 &dm_attr_use_blk_mq.attr,
110 &dm_attr_rq_based_seq_io_merge_deadline.attr,
111 NULL,
112};
113
114static const struct sysfs_ops dm_sysfs_ops = {
115 .show = dm_attr_show,
116 .store = dm_attr_store,
117};
118
119static struct kobj_type dm_ktype = {
120 .sysfs_ops = &dm_sysfs_ops,
121 .default_attrs = dm_attrs,
122 .release = dm_kobject_release,
123};
124
125/*
126 * Initialize kobj
127 * because nobody using md yet, no need to call explicit dm_get/put
128 */
129int dm_sysfs_init(struct mapped_device *md)
130{
131 return kobject_init_and_add(dm_kobject(md), &dm_ktype,
132 &disk_to_dev(dm_disk(md))->kobj,
133 "%s", "dm");
134}
135
136/*
137 * Remove kobj, called after all references removed
138 */
139void dm_sysfs_exit(struct mapped_device *md)
140{
141 struct kobject *kobj = dm_kobject(md);
142 kobject_put(kobj);
143 wait_for_completion(dm_get_completion_from_kobject(kobj));
144}