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6cbd5570 CM |
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 | ||
58176a96 JB |
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 | ||
bae45de0 CM |
27 | #include "ctree.h" |
28 | #include "disk-io.h" | |
29 | #include "transaction.h" | |
58176a96 | 30 | |
55d47414 | 31 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) |
58176a96 JB |
32 | static ssize_t root_blocks_used_show(struct btrfs_root *root, char *buf) |
33 | { | |
34 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
5f39d397 | 35 | (unsigned long long)btrfs_root_used(&root->root_item)); |
58176a96 JB |
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", | |
5f39d397 | 41 | (unsigned long long)btrfs_root_limit(&root->root_item)); |
58176a96 JB |
42 | } |
43 | ||
44 | static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf) | |
45 | { | |
db94535d | 46 | |
58176a96 | 47 | return snprintf(buf, PAGE_SIZE, "%llu\n", |
db94535d | 48 | (unsigned long long)btrfs_super_bytes_used(&fs->super_copy)); |
58176a96 JB |
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", | |
db94535d | 54 | (unsigned long long)btrfs_super_total_bytes(&fs->super_copy)); |
58176a96 JB |
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", | |
5f39d397 | 60 | (unsigned long long)btrfs_super_sectorsize(&fs->super_copy)); |
58176a96 JB |
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 | ||
e3fe4e71 GK |
188 | /* /sys/fs/btrfs/ entry */ |
189 | static struct kset *btrfs_kset; | |
58176a96 JB |
190 | |
191 | int btrfs_sysfs_add_super(struct btrfs_fs_info *fs) | |
192 | { | |
193 | int error; | |
6da6abae CM |
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'; | |
58176a96 | 212 | |
e3fe4e71 GK |
213 | fs->super_kobj.kset = btrfs_kset; |
214 | error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype, | |
215 | NULL, "%s", name); | |
58176a96 JB |
216 | if (error) |
217 | goto fail; | |
218 | ||
6da6abae | 219 | kfree(name); |
58176a96 JB |
220 | return 0; |
221 | ||
222 | fail: | |
6da6abae | 223 | kfree(name); |
58176a96 JB |
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 | ||
e3fe4e71 GK |
232 | error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype, |
233 | &root->fs_info->super_kobj, | |
234 | "%s", root->name); | |
58176a96 JB |
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 | { | |
e3fe4e71 | 247 | kobject_put(&root->root_kobj); |
58176a96 JB |
248 | wait_for_completion(&root->kobj_unregister); |
249 | } | |
250 | ||
251 | void btrfs_sysfs_del_super(struct btrfs_fs_info *fs) | |
252 | { | |
e3fe4e71 | 253 | kobject_put(&fs->super_kobj); |
58176a96 JB |
254 | wait_for_completion(&fs->kobj_unregister); |
255 | } | |
256 | ||
257 | int btrfs_init_sysfs() | |
258 | { | |
e3fe4e71 GK |
259 | btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); |
260 | if (!btrfs_kset) | |
261 | return -ENOMEM; | |
262 | return 0; | |
58176a96 JB |
263 | } |
264 | ||
265 | void btrfs_exit_sysfs() | |
266 | { | |
e3fe4e71 | 267 | kset_unregister(btrfs_kset); |
58176a96 | 268 | } |
55d47414 CM |
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() | |
293 | { | |
294 | return 0; | |
295 | } | |
296 | ||
297 | void btrfs_exit_sysfs() | |
298 | { | |
299 | return; | |
300 | } | |
301 | #endif |