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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 | ||
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 *); | |
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 | static 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 | ||
51 | static 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 | ||
60 | static DM_ATTR_RO(name); | |
61 | static DM_ATTR_RO(uuid); | |
62 | ||
63 | static struct attribute *dm_attrs[] = { | |
64 | &dm_attr_name.attr, | |
65 | &dm_attr_uuid.attr, | |
66 | NULL, | |
67 | }; | |
68 | ||
69 | static struct sysfs_ops dm_sysfs_ops = { | |
70 | .show = dm_attr_show, | |
71 | }; | |
72 | ||
73 | /* | |
74 | * dm kobject is embedded in mapped_device structure | |
75 | * no need to define release function here | |
76 | */ | |
77 | static struct kobj_type dm_ktype = { | |
78 | .sysfs_ops = &dm_sysfs_ops, | |
79 | .default_attrs = dm_attrs, | |
80 | }; | |
81 | ||
82 | /* | |
83 | * Initialize kobj | |
84 | * because nobody using md yet, no need to call explicit dm_get/put | |
85 | */ | |
86 | int dm_sysfs_init(struct mapped_device *md) | |
87 | { | |
88 | return kobject_init_and_add(dm_kobject(md), &dm_ktype, | |
89 | &disk_to_dev(dm_disk(md))->kobj, | |
90 | "%s", "dm"); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Remove kobj, called after all references removed | |
95 | */ | |
96 | void dm_sysfs_exit(struct mapped_device *md) | |
97 | { | |
98 | kobject_put(dm_kobject(md)); | |
99 | } |