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aebe17f6 VD |
1 | /* |
2 | * sysfs.c - sysfs support implementation. | |
3 | * | |
4 | * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation. | |
5 | * Copyright (C) 2014 HGST, Inc., a Western Digital Company. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> | |
18 | */ | |
19 | ||
20 | #include <linux/kobject.h> | |
21 | ||
22 | #include "nilfs.h" | |
23 | #include "mdt.h" | |
24 | #include "sufile.h" | |
25 | #include "cpfile.h" | |
26 | #include "sysfs.h" | |
27 | ||
28 | /* /sys/fs/<nilfs>/ */ | |
29 | static struct kset *nilfs_kset; | |
30 | ||
31 | #define NILFS_SHOW_TIME(time_t_val, buf) ({ \ | |
32 | struct tm res; \ | |
33 | int count = 0; \ | |
34 | time_to_tm(time_t_val, 0, &res); \ | |
35 | res.tm_year += 1900; \ | |
36 | res.tm_mon += 1; \ | |
37 | count = scnprintf(buf, PAGE_SIZE, \ | |
38 | "%ld-%.2d-%.2d %.2d:%.2d:%.2d\n", \ | |
39 | res.tm_year, res.tm_mon, res.tm_mday, \ | |
40 | res.tm_hour, res.tm_min, res.tm_sec);\ | |
41 | count; \ | |
42 | }) | |
43 | ||
da7141fb VD |
44 | /************************************************************************ |
45 | * NILFS device attrs * | |
46 | ************************************************************************/ | |
47 | ||
48 | static | |
49 | ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr, | |
50 | struct the_nilfs *nilfs, | |
51 | char *buf) | |
52 | { | |
53 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
54 | u32 major = le32_to_cpu(sbp[0]->s_rev_level); | |
55 | u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level); | |
56 | ||
57 | return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor); | |
58 | } | |
59 | ||
60 | static | |
61 | ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr, | |
62 | struct the_nilfs *nilfs, | |
63 | char *buf) | |
64 | { | |
65 | return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize); | |
66 | } | |
67 | ||
68 | static | |
69 | ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr, | |
70 | struct the_nilfs *nilfs, | |
71 | char *buf) | |
72 | { | |
73 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
74 | u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size); | |
75 | ||
76 | return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size); | |
77 | } | |
78 | ||
79 | static | |
80 | ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr, | |
81 | struct the_nilfs *nilfs, | |
82 | char *buf) | |
83 | { | |
84 | sector_t free_blocks = 0; | |
85 | ||
86 | nilfs_count_free_blocks(nilfs, &free_blocks); | |
87 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
88 | (unsigned long long)free_blocks); | |
89 | } | |
90 | ||
91 | static | |
92 | ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr, | |
93 | struct the_nilfs *nilfs, | |
94 | char *buf) | |
95 | { | |
96 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
97 | ||
98 | return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid); | |
99 | } | |
100 | ||
101 | static | |
102 | ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr, | |
103 | struct the_nilfs *nilfs, | |
104 | char *buf) | |
105 | { | |
106 | struct nilfs_super_block **sbp = nilfs->ns_sbp; | |
107 | ||
108 | return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n", | |
109 | sbp[0]->s_volume_name); | |
110 | } | |
111 | ||
112 | static const char dev_readme_str[] = | |
113 | "The <device> group contains attributes that describe file system\n" | |
114 | "partition's details.\n\n" | |
115 | "(1) revision\n\tshow NILFS file system revision.\n\n" | |
116 | "(2) blocksize\n\tshow volume block size in bytes.\n\n" | |
117 | "(3) device_size\n\tshow volume size in bytes.\n\n" | |
118 | "(4) free_blocks\n\tshow count of free blocks on volume.\n\n" | |
119 | "(5) uuid\n\tshow volume's UUID.\n\n" | |
120 | "(6) volume_name\n\tshow volume's name.\n\n"; | |
121 | ||
122 | static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr, | |
123 | struct the_nilfs *nilfs, | |
124 | char *buf) | |
125 | { | |
126 | return snprintf(buf, PAGE_SIZE, dev_readme_str); | |
127 | } | |
128 | ||
129 | NILFS_DEV_RO_ATTR(revision); | |
130 | NILFS_DEV_RO_ATTR(blocksize); | |
131 | NILFS_DEV_RO_ATTR(device_size); | |
132 | NILFS_DEV_RO_ATTR(free_blocks); | |
133 | NILFS_DEV_RO_ATTR(uuid); | |
134 | NILFS_DEV_RO_ATTR(volume_name); | |
135 | NILFS_DEV_RO_ATTR(README); | |
136 | ||
137 | static struct attribute *nilfs_dev_attrs[] = { | |
138 | NILFS_DEV_ATTR_LIST(revision), | |
139 | NILFS_DEV_ATTR_LIST(blocksize), | |
140 | NILFS_DEV_ATTR_LIST(device_size), | |
141 | NILFS_DEV_ATTR_LIST(free_blocks), | |
142 | NILFS_DEV_ATTR_LIST(uuid), | |
143 | NILFS_DEV_ATTR_LIST(volume_name), | |
144 | NILFS_DEV_ATTR_LIST(README), | |
145 | NULL, | |
146 | }; | |
147 | ||
148 | static ssize_t nilfs_dev_attr_show(struct kobject *kobj, | |
149 | struct attribute *attr, char *buf) | |
150 | { | |
151 | struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs, | |
152 | ns_dev_kobj); | |
153 | struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr, | |
154 | attr); | |
155 | ||
156 | return a->show ? a->show(a, nilfs, buf) : 0; | |
157 | } | |
158 | ||
159 | static ssize_t nilfs_dev_attr_store(struct kobject *kobj, | |
160 | struct attribute *attr, | |
161 | const char *buf, size_t len) | |
162 | { | |
163 | struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs, | |
164 | ns_dev_kobj); | |
165 | struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr, | |
166 | attr); | |
167 | ||
168 | return a->store ? a->store(a, nilfs, buf, len) : 0; | |
169 | } | |
170 | ||
171 | static void nilfs_dev_attr_release(struct kobject *kobj) | |
172 | { | |
173 | struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs, | |
174 | ns_dev_kobj); | |
175 | complete(&nilfs->ns_dev_kobj_unregister); | |
176 | } | |
177 | ||
178 | static const struct sysfs_ops nilfs_dev_attr_ops = { | |
179 | .show = nilfs_dev_attr_show, | |
180 | .store = nilfs_dev_attr_store, | |
181 | }; | |
182 | ||
183 | static struct kobj_type nilfs_dev_ktype = { | |
184 | .default_attrs = nilfs_dev_attrs, | |
185 | .sysfs_ops = &nilfs_dev_attr_ops, | |
186 | .release = nilfs_dev_attr_release, | |
187 | }; | |
188 | ||
189 | int nilfs_sysfs_create_device_group(struct super_block *sb) | |
190 | { | |
191 | struct the_nilfs *nilfs = sb->s_fs_info; | |
192 | int err; | |
193 | ||
194 | nilfs->ns_dev_kobj.kset = nilfs_kset; | |
195 | init_completion(&nilfs->ns_dev_kobj_unregister); | |
196 | err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL, | |
197 | "%s", sb->s_id); | |
198 | if (err) | |
199 | goto failed_create_device_group; | |
200 | ||
201 | return 0; | |
202 | ||
203 | failed_create_device_group: | |
204 | return err; | |
205 | } | |
206 | ||
207 | void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs) | |
208 | { | |
209 | kobject_del(&nilfs->ns_dev_kobj); | |
210 | } | |
211 | ||
aebe17f6 VD |
212 | /************************************************************************ |
213 | * NILFS feature attrs * | |
214 | ************************************************************************/ | |
215 | ||
216 | static ssize_t nilfs_feature_revision_show(struct kobject *kobj, | |
217 | struct attribute *attr, char *buf) | |
218 | { | |
219 | return snprintf(buf, PAGE_SIZE, "%d.%d\n", | |
220 | NILFS_CURRENT_REV, NILFS_MINOR_REV); | |
221 | } | |
222 | ||
223 | static const char features_readme_str[] = | |
224 | "The features group contains attributes that describe NILFS file\n" | |
225 | "system driver features.\n\n" | |
226 | "(1) revision\n\tshow current revision of NILFS file system driver.\n"; | |
227 | ||
228 | static ssize_t nilfs_feature_README_show(struct kobject *kobj, | |
229 | struct attribute *attr, | |
230 | char *buf) | |
231 | { | |
232 | return snprintf(buf, PAGE_SIZE, features_readme_str); | |
233 | } | |
234 | ||
235 | NILFS_FEATURE_RO_ATTR(revision); | |
236 | NILFS_FEATURE_RO_ATTR(README); | |
237 | ||
238 | static struct attribute *nilfs_feature_attrs[] = { | |
239 | NILFS_FEATURE_ATTR_LIST(revision), | |
240 | NILFS_FEATURE_ATTR_LIST(README), | |
241 | NULL, | |
242 | }; | |
243 | ||
244 | static const struct attribute_group nilfs_feature_attr_group = { | |
245 | .name = "features", | |
246 | .attrs = nilfs_feature_attrs, | |
247 | }; | |
248 | ||
249 | int __init nilfs_sysfs_init(void) | |
250 | { | |
251 | int err; | |
252 | ||
253 | nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj); | |
254 | if (!nilfs_kset) { | |
255 | err = -ENOMEM; | |
256 | printk(KERN_ERR "NILFS: unable to create sysfs entry: err %d\n", | |
257 | err); | |
258 | goto failed_sysfs_init; | |
259 | } | |
260 | ||
261 | err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group); | |
262 | if (unlikely(err)) { | |
263 | printk(KERN_ERR "NILFS: unable to create feature group: err %d\n", | |
264 | err); | |
265 | goto cleanup_sysfs_init; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | ||
270 | cleanup_sysfs_init: | |
271 | kset_unregister(nilfs_kset); | |
272 | ||
273 | failed_sysfs_init: | |
274 | return err; | |
275 | } | |
276 | ||
277 | void nilfs_sysfs_exit(void) | |
278 | { | |
279 | sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group); | |
280 | kset_unregister(nilfs_kset); | |
281 | } |