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784aae73 MB |
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> | |
4cc96131 MS |
9 | #include "dm-core.h" |
10 | #include "dm-rq.h" | |
784aae73 MB |
11 | |
12 | struct dm_sysfs_attr { | |
13 | struct attribute attr; | |
14 | ssize_t (*show)(struct mapped_device *, char *); | |
b898320d | 15 | ssize_t (*store)(struct mapped_device *, const char *, size_t count); |
784aae73 MB |
16 | }; |
17 | ||
18 | #define DM_ATTR_RO(_name) \ | |
19 | struct dm_sysfs_attr dm_attr_##_name = \ | |
20 | __ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL) | |
21 | ||
22 | static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr, | |
23 | char *page) | |
24 | { | |
25 | struct dm_sysfs_attr *dm_attr; | |
26 | struct mapped_device *md; | |
27 | ssize_t ret; | |
28 | ||
29 | dm_attr = container_of(attr, struct dm_sysfs_attr, attr); | |
30 | if (!dm_attr->show) | |
31 | return -EIO; | |
32 | ||
33 | md = dm_get_from_kobject(kobj); | |
34 | if (!md) | |
35 | return -EINVAL; | |
36 | ||
37 | ret = dm_attr->show(md, page); | |
38 | dm_put(md); | |
39 | ||
40 | return ret; | |
41 | } | |
42 | ||
b898320d MS |
43 | #define DM_ATTR_RW(_name) \ |
44 | struct dm_sysfs_attr dm_attr_##_name = \ | |
45 | __ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store) | |
46 | ||
47 | static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr, | |
48 | const char *page, size_t count) | |
49 | { | |
50 | struct dm_sysfs_attr *dm_attr; | |
51 | struct mapped_device *md; | |
52 | ssize_t ret; | |
53 | ||
54 | dm_attr = container_of(attr, struct dm_sysfs_attr, attr); | |
55 | if (!dm_attr->store) | |
56 | return -EIO; | |
57 | ||
58 | md = dm_get_from_kobject(kobj); | |
59 | if (!md) | |
60 | return -EINVAL; | |
61 | ||
62 | ret = dm_attr->store(md, page, count); | |
63 | dm_put(md); | |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
784aae73 MB |
68 | static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf) |
69 | { | |
70 | if (dm_copy_name_and_uuid(md, buf, NULL)) | |
71 | return -EIO; | |
72 | ||
73 | strcat(buf, "\n"); | |
74 | return strlen(buf); | |
75 | } | |
76 | ||
77 | static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf) | |
78 | { | |
79 | if (dm_copy_name_and_uuid(md, NULL, buf)) | |
80 | return -EIO; | |
81 | ||
82 | strcat(buf, "\n"); | |
83 | return strlen(buf); | |
84 | } | |
85 | ||
486d220f PR |
86 | static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf) |
87 | { | |
4f186f8b | 88 | sprintf(buf, "%d\n", dm_suspended_md(md)); |
486d220f PR |
89 | |
90 | return strlen(buf); | |
91 | } | |
92 | ||
17e149b8 MS |
93 | static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf) |
94 | { | |
6a23e05c JA |
95 | /* Purely for userspace compatibility */ |
96 | sprintf(buf, "%d\n", true); | |
17e149b8 MS |
97 | |
98 | return strlen(buf); | |
99 | } | |
100 | ||
784aae73 MB |
101 | static DM_ATTR_RO(name); |
102 | static DM_ATTR_RO(uuid); | |
486d220f | 103 | static DM_ATTR_RO(suspended); |
17e149b8 | 104 | static DM_ATTR_RO(use_blk_mq); |
0ce65797 | 105 | static DM_ATTR_RW(rq_based_seq_io_merge_deadline); |
784aae73 MB |
106 | |
107 | static struct attribute *dm_attrs[] = { | |
108 | &dm_attr_name.attr, | |
109 | &dm_attr_uuid.attr, | |
486d220f | 110 | &dm_attr_suspended.attr, |
17e149b8 | 111 | &dm_attr_use_blk_mq.attr, |
0ce65797 | 112 | &dm_attr_rq_based_seq_io_merge_deadline.attr, |
784aae73 MB |
113 | NULL, |
114 | }; | |
115 | ||
52cf25d0 | 116 | static const struct sysfs_ops dm_sysfs_ops = { |
784aae73 | 117 | .show = dm_attr_show, |
b898320d | 118 | .store = dm_attr_store, |
784aae73 MB |
119 | }; |
120 | ||
784aae73 MB |
121 | static struct kobj_type dm_ktype = { |
122 | .sysfs_ops = &dm_sysfs_ops, | |
123 | .default_attrs = dm_attrs, | |
be35f486 | 124 | .release = dm_kobject_release, |
784aae73 MB |
125 | }; |
126 | ||
127 | /* | |
128 | * Initialize kobj | |
129 | * because nobody using md yet, no need to call explicit dm_get/put | |
130 | */ | |
131 | int dm_sysfs_init(struct mapped_device *md) | |
132 | { | |
133 | return kobject_init_and_add(dm_kobject(md), &dm_ktype, | |
134 | &disk_to_dev(dm_disk(md))->kobj, | |
135 | "%s", "dm"); | |
136 | } | |
137 | ||
138 | /* | |
139 | * Remove kobj, called after all references removed | |
140 | */ | |
141 | void dm_sysfs_exit(struct mapped_device *md) | |
142 | { | |
be35f486 MP |
143 | struct kobject *kobj = dm_kobject(md); |
144 | kobject_put(kobj); | |
145 | wait_for_completion(dm_get_completion_from_kobject(kobj)); | |
784aae73 | 146 | } |