diff options
Diffstat (limited to 'fs/btrfs/sysfs.c')
-rw-r--r-- | fs/btrfs/sysfs.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c new file mode 100644 index 000000000000..61af5d8446e3 --- /dev/null +++ b/fs/btrfs/sysfs.c | |||
@@ -0,0 +1,301 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2007 Oracle. All rights reserved. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or | ||
5 | * modify it under the terms of the GNU General Public | ||
6 | * License v2 as published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope that it will be useful, | ||
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
11 | * General Public License for more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public | ||
14 | * License along with this program; if not, write to the | ||
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | ||
16 | * Boston, MA 021110-1307, USA. | ||
17 | */ | ||
18 | |||
19 | #include <linux/sched.h> | ||
20 | #include <linux/slab.h> | ||
21 | #include <linux/spinlock.h> | ||
22 | #include <linux/completion.h> | ||
23 | #include <linux/buffer_head.h> | ||
24 | #include <linux/module.h> | ||
25 | #include <linux/kobject.h> | ||
26 | |||
27 | #include "ctree.h" | ||
28 | #include "disk-io.h" | ||
29 | #include "transaction.h" | ||
30 | |||
31 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) | ||
32 | static ssize_t root_blocks_used_show(struct btrfs_root *root, char *buf) | ||
33 | { | ||
34 | return snprintf(buf, PAGE_SIZE, "%llu\n", | ||
35 | (unsigned long long)btrfs_root_used(&root->root_item)); | ||
36 | } | ||
37 | |||
38 | static ssize_t root_block_limit_show(struct btrfs_root *root, char *buf) | ||
39 | { | ||
40 | return snprintf(buf, PAGE_SIZE, "%llu\n", | ||
41 | (unsigned long long)btrfs_root_limit(&root->root_item)); | ||
42 | } | ||
43 | |||
44 | static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf) | ||
45 | { | ||
46 | |||
47 | return snprintf(buf, PAGE_SIZE, "%llu\n", | ||
48 | (unsigned long long)btrfs_super_bytes_used(&fs->super_copy)); | ||
49 | } | ||
50 | |||
51 | static ssize_t super_total_blocks_show(struct btrfs_fs_info *fs, char *buf) | ||
52 | { | ||
53 | return snprintf(buf, PAGE_SIZE, "%llu\n", | ||
54 | (unsigned long long)btrfs_super_total_bytes(&fs->super_copy)); | ||
55 | } | ||
56 | |||
57 | static ssize_t super_blocksize_show(struct btrfs_fs_info *fs, char *buf) | ||
58 | { | ||
59 | return snprintf(buf, PAGE_SIZE, "%llu\n", | ||
60 | (unsigned long long)btrfs_super_sectorsize(&fs->super_copy)); | ||
61 | } | ||
62 | |||
63 | /* this is for root attrs (subvols/snapshots) */ | ||
64 | struct btrfs_root_attr { | ||
65 | struct attribute attr; | ||
66 | ssize_t (*show)(struct btrfs_root *, char *); | ||
67 | ssize_t (*store)(struct btrfs_root *, const char *, size_t); | ||
68 | }; | ||
69 | |||
70 | #define ROOT_ATTR(name, mode, show, store) \ | ||
71 | static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, show, store) | ||
72 | |||
73 | ROOT_ATTR(blocks_used, 0444, root_blocks_used_show, NULL); | ||
74 | ROOT_ATTR(block_limit, 0644, root_block_limit_show, NULL); | ||
75 | |||
76 | static struct attribute *btrfs_root_attrs[] = { | ||
77 | &btrfs_root_attr_blocks_used.attr, | ||
78 | &btrfs_root_attr_block_limit.attr, | ||
79 | NULL, | ||
80 | }; | ||
81 | |||
82 | /* this is for super attrs (actual full fs) */ | ||
83 | struct btrfs_super_attr { | ||
84 | struct attribute attr; | ||
85 | ssize_t (*show)(struct btrfs_fs_info *, char *); | ||
86 | ssize_t (*store)(struct btrfs_fs_info *, const char *, size_t); | ||
87 | }; | ||
88 | |||
89 | #define SUPER_ATTR(name, mode, show, store) \ | ||
90 | static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, show, store) | ||
91 | |||
92 | SUPER_ATTR(blocks_used, 0444, super_blocks_used_show, NULL); | ||
93 | SUPER_ATTR(total_blocks, 0444, super_total_blocks_show, NULL); | ||
94 | SUPER_ATTR(blocksize, 0444, super_blocksize_show, NULL); | ||
95 | |||
96 | static struct attribute *btrfs_super_attrs[] = { | ||
97 | &btrfs_super_attr_blocks_used.attr, | ||
98 | &btrfs_super_attr_total_blocks.attr, | ||
99 | &btrfs_super_attr_blocksize.attr, | ||
100 | NULL, | ||
101 | }; | ||
102 | |||
103 | static ssize_t btrfs_super_attr_show(struct kobject *kobj, | ||
104 | struct attribute *attr, char *buf) | ||
105 | { | ||
106 | struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info, | ||
107 | super_kobj); | ||
108 | struct btrfs_super_attr *a = container_of(attr, | ||
109 | struct btrfs_super_attr, | ||
110 | attr); | ||
111 | |||
112 | return a->show ? a->show(fs, buf) : 0; | ||
113 | } | ||
114 | |||
115 | static ssize_t btrfs_super_attr_store(struct kobject *kobj, | ||
116 | struct attribute *attr, | ||
117 | const char *buf, size_t len) | ||
118 | { | ||
119 | struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info, | ||
120 | super_kobj); | ||
121 | struct btrfs_super_attr *a = container_of(attr, | ||
122 | struct btrfs_super_attr, | ||
123 | attr); | ||
124 | |||
125 | return a->store ? a->store(fs, buf, len) : 0; | ||
126 | } | ||
127 | |||
128 | static ssize_t btrfs_root_attr_show(struct kobject *kobj, | ||
129 | struct attribute *attr, char *buf) | ||
130 | { | ||
131 | struct btrfs_root *root = container_of(kobj, struct btrfs_root, | ||
132 | root_kobj); | ||
133 | struct btrfs_root_attr *a = container_of(attr, | ||
134 | struct btrfs_root_attr, | ||
135 | attr); | ||
136 | |||
137 | return a->show ? a->show(root, buf) : 0; | ||
138 | } | ||
139 | |||
140 | static ssize_t btrfs_root_attr_store(struct kobject *kobj, | ||
141 | struct attribute *attr, | ||
142 | const char *buf, size_t len) | ||
143 | { | ||
144 | struct btrfs_root *root = container_of(kobj, struct btrfs_root, | ||
145 | root_kobj); | ||
146 | struct btrfs_root_attr *a = container_of(attr, | ||
147 | struct btrfs_root_attr, | ||
148 | attr); | ||
149 | return a->store ? a->store(root, buf, len) : 0; | ||
150 | } | ||
151 | |||
152 | static void btrfs_super_release(struct kobject *kobj) | ||
153 | { | ||
154 | struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info, | ||
155 | super_kobj); | ||
156 | complete(&fs->kobj_unregister); | ||
157 | } | ||
158 | |||
159 | static void btrfs_root_release(struct kobject *kobj) | ||
160 | { | ||
161 | struct btrfs_root *root = container_of(kobj, struct btrfs_root, | ||
162 | root_kobj); | ||
163 | complete(&root->kobj_unregister); | ||
164 | } | ||
165 | |||
166 | static struct sysfs_ops btrfs_super_attr_ops = { | ||
167 | .show = btrfs_super_attr_show, | ||
168 | .store = btrfs_super_attr_store, | ||
169 | }; | ||
170 | |||
171 | static struct sysfs_ops btrfs_root_attr_ops = { | ||
172 | .show = btrfs_root_attr_show, | ||
173 | .store = btrfs_root_attr_store, | ||
174 | }; | ||
175 | |||
176 | static struct kobj_type btrfs_root_ktype = { | ||
177 | .default_attrs = btrfs_root_attrs, | ||
178 | .sysfs_ops = &btrfs_root_attr_ops, | ||
179 | .release = btrfs_root_release, | ||
180 | }; | ||
181 | |||
182 | static struct kobj_type btrfs_super_ktype = { | ||
183 | .default_attrs = btrfs_super_attrs, | ||
184 | .sysfs_ops = &btrfs_super_attr_ops, | ||
185 | .release = btrfs_super_release, | ||
186 | }; | ||
187 | |||
188 | /* /sys/fs/btrfs/ entry */ | ||
189 | static struct kset *btrfs_kset; | ||
190 | |||
191 | int btrfs_sysfs_add_super(struct btrfs_fs_info *fs) | ||
192 | { | ||
193 | int error; | ||
194 | char *name; | ||
195 | char c; | ||
196 | int len = strlen(fs->sb->s_id) + 1; | ||
197 | int i; | ||
198 | |||
199 | name = kmalloc(len, GFP_NOFS); | ||
200 | if (!name) { | ||
201 | error = -ENOMEM; | ||
202 | goto fail; | ||
203 | } | ||
204 | |||
205 | for (i = 0; i < len; i++) { | ||
206 | c = fs->sb->s_id[i]; | ||
207 | if (c == '/' || c == '\\') | ||
208 | c = '!'; | ||
209 | name[i] = c; | ||
210 | } | ||
211 | name[len] = '\0'; | ||
212 | |||
213 | fs->super_kobj.kset = btrfs_kset; | ||
214 | error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype, | ||
215 | NULL, "%s", name); | ||
216 | if (error) | ||
217 | goto fail; | ||
218 | |||
219 | kfree(name); | ||
220 | return 0; | ||
221 | |||
222 | fail: | ||
223 | kfree(name); | ||
224 | printk(KERN_ERR "btrfs: sysfs creation for super failed\n"); | ||
225 | return error; | ||
226 | } | ||
227 | |||
228 | int btrfs_sysfs_add_root(struct btrfs_root *root) | ||
229 | { | ||
230 | int error; | ||
231 | |||
232 | error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype, | ||
233 | &root->fs_info->super_kobj, | ||
234 | "%s", root->name); | ||
235 | if (error) | ||
236 | goto fail; | ||
237 | |||
238 | return 0; | ||
239 | |||
240 | fail: | ||
241 | printk(KERN_ERR "btrfs: sysfs creation for root failed\n"); | ||
242 | return error; | ||
243 | } | ||
244 | |||
245 | void btrfs_sysfs_del_root(struct btrfs_root *root) | ||
246 | { | ||
247 | kobject_put(&root->root_kobj); | ||
248 | wait_for_completion(&root->kobj_unregister); | ||
249 | } | ||
250 | |||
251 | void btrfs_sysfs_del_super(struct btrfs_fs_info *fs) | ||
252 | { | ||
253 | kobject_put(&fs->super_kobj); | ||
254 | wait_for_completion(&fs->kobj_unregister); | ||
255 | } | ||
256 | |||
257 | int btrfs_init_sysfs(void) | ||
258 | { | ||
259 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); | ||
260 | if (!btrfs_kset) | ||
261 | return -ENOMEM; | ||
262 | return 0; | ||
263 | } | ||
264 | |||
265 | void btrfs_exit_sysfs(void) | ||
266 | { | ||
267 | kset_unregister(btrfs_kset); | ||
268 | } | ||
269 | |||
270 | #else | ||
271 | |||
272 | int btrfs_sysfs_add_super(struct btrfs_fs_info *fs) | ||
273 | { | ||
274 | return 0; | ||
275 | } | ||
276 | |||
277 | int btrfs_sysfs_add_root(struct btrfs_root *root) | ||
278 | { | ||
279 | return 0; | ||
280 | } | ||
281 | |||
282 | void btrfs_sysfs_del_root(struct btrfs_root *root) | ||
283 | { | ||
284 | return; | ||
285 | } | ||
286 | |||
287 | void btrfs_sysfs_del_super(struct btrfs_fs_info *fs) | ||
288 | { | ||
289 | return; | ||
290 | } | ||
291 | |||
292 | int btrfs_init_sysfs(void) | ||
293 | { | ||
294 | return 0; | ||
295 | } | ||
296 | |||
297 | void btrfs_exit_sysfs(void) | ||
298 | { | ||
299 | return; | ||
300 | } | ||
301 | #endif | ||