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Merge tag 'armsoc-arm64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[karo-tx-linux.git] / drivers / md / dm-sysfs.c
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 *, const char *, size_t count);
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 #define DM_ATTR_RW(_name) \
43 struct dm_sysfs_attr dm_attr_##_name = \
44         __ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store)
45
46 static 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
67 static 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
76 static 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
85 static 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
92 static 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
99 static DM_ATTR_RO(name);
100 static DM_ATTR_RO(uuid);
101 static DM_ATTR_RO(suspended);
102 static DM_ATTR_RO(use_blk_mq);
103 static DM_ATTR_RW(rq_based_seq_io_merge_deadline);
104
105 static 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
114 static const struct sysfs_ops dm_sysfs_ops = {
115         .show   = dm_attr_show,
116         .store  = dm_attr_store,
117 };
118
119 static 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  */
129 int 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  */
139 void 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 }