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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 JB |
30 | |
31 | static ssize_t root_blocks_used_show(struct btrfs_root *root, char *buf) | |
32 | { | |
33 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
5f39d397 | 34 | (unsigned long long)btrfs_root_used(&root->root_item)); |
58176a96 JB |
35 | } |
36 | ||
37 | static ssize_t root_block_limit_show(struct btrfs_root *root, char *buf) | |
38 | { | |
39 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
5f39d397 | 40 | (unsigned long long)btrfs_root_limit(&root->root_item)); |
58176a96 JB |
41 | } |
42 | ||
43 | static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf) | |
44 | { | |
db94535d | 45 | |
58176a96 | 46 | return snprintf(buf, PAGE_SIZE, "%llu\n", |
db94535d | 47 | (unsigned long long)btrfs_super_bytes_used(&fs->super_copy)); |
58176a96 JB |
48 | } |
49 | ||
50 | static ssize_t super_total_blocks_show(struct btrfs_fs_info *fs, char *buf) | |
51 | { | |
52 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
db94535d | 53 | (unsigned long long)btrfs_super_total_bytes(&fs->super_copy)); |
58176a96 JB |
54 | } |
55 | ||
56 | static ssize_t super_blocksize_show(struct btrfs_fs_info *fs, char *buf) | |
57 | { | |
58 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
5f39d397 | 59 | (unsigned long long)btrfs_super_sectorsize(&fs->super_copy)); |
58176a96 JB |
60 | } |
61 | ||
62 | /* this is for root attrs (subvols/snapshots) */ | |
63 | struct btrfs_root_attr { | |
64 | struct attribute attr; | |
65 | ssize_t (*show)(struct btrfs_root *, char *); | |
66 | ssize_t (*store)(struct btrfs_root *, const char *, size_t); | |
67 | }; | |
68 | ||
69 | #define ROOT_ATTR(name, mode, show, store) \ | |
70 | static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, show, store) | |
71 | ||
72 | ROOT_ATTR(blocks_used, 0444, root_blocks_used_show, NULL); | |
73 | ROOT_ATTR(block_limit, 0644, root_block_limit_show, NULL); | |
74 | ||
75 | static struct attribute *btrfs_root_attrs[] = { | |
76 | &btrfs_root_attr_blocks_used.attr, | |
77 | &btrfs_root_attr_block_limit.attr, | |
78 | NULL, | |
79 | }; | |
80 | ||
81 | /* this is for super attrs (actual full fs) */ | |
82 | struct btrfs_super_attr { | |
83 | struct attribute attr; | |
84 | ssize_t (*show)(struct btrfs_fs_info *, char *); | |
85 | ssize_t (*store)(struct btrfs_fs_info *, const char *, size_t); | |
86 | }; | |
87 | ||
88 | #define SUPER_ATTR(name, mode, show, store) \ | |
89 | static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, show, store) | |
90 | ||
91 | SUPER_ATTR(blocks_used, 0444, super_blocks_used_show, NULL); | |
92 | SUPER_ATTR(total_blocks, 0444, super_total_blocks_show, NULL); | |
93 | SUPER_ATTR(blocksize, 0444, super_blocksize_show, NULL); | |
94 | ||
95 | static struct attribute *btrfs_super_attrs[] = { | |
96 | &btrfs_super_attr_blocks_used.attr, | |
97 | &btrfs_super_attr_total_blocks.attr, | |
98 | &btrfs_super_attr_blocksize.attr, | |
99 | NULL, | |
100 | }; | |
101 | ||
102 | static ssize_t btrfs_super_attr_show(struct kobject *kobj, | |
103 | struct attribute *attr, char *buf) | |
104 | { | |
105 | struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info, | |
106 | super_kobj); | |
107 | struct btrfs_super_attr *a = container_of(attr, | |
108 | struct btrfs_super_attr, | |
109 | attr); | |
110 | ||
111 | return a->show ? a->show(fs, buf) : 0; | |
112 | } | |
113 | ||
114 | static ssize_t btrfs_super_attr_store(struct kobject *kobj, | |
115 | struct attribute *attr, | |
116 | const char *buf, size_t len) | |
117 | { | |
118 | struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info, | |
119 | super_kobj); | |
120 | struct btrfs_super_attr *a = container_of(attr, | |
121 | struct btrfs_super_attr, | |
122 | attr); | |
123 | ||
124 | return a->store ? a->store(fs, buf, len) : 0; | |
125 | } | |
126 | ||
127 | static ssize_t btrfs_root_attr_show(struct kobject *kobj, | |
128 | struct attribute *attr, char *buf) | |
129 | { | |
130 | struct btrfs_root *root = container_of(kobj, struct btrfs_root, | |
131 | root_kobj); | |
132 | struct btrfs_root_attr *a = container_of(attr, | |
133 | struct btrfs_root_attr, | |
134 | attr); | |
135 | ||
136 | return a->show ? a->show(root, buf) : 0; | |
137 | } | |
138 | ||
139 | static ssize_t btrfs_root_attr_store(struct kobject *kobj, | |
140 | struct attribute *attr, | |
141 | const char *buf, size_t len) | |
142 | { | |
143 | struct btrfs_root *root = container_of(kobj, struct btrfs_root, | |
144 | root_kobj); | |
145 | struct btrfs_root_attr *a = container_of(attr, | |
146 | struct btrfs_root_attr, | |
147 | attr); | |
148 | return a->store ? a->store(root, buf, len) : 0; | |
149 | } | |
150 | ||
151 | static void btrfs_super_release(struct kobject *kobj) | |
152 | { | |
153 | struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info, | |
154 | super_kobj); | |
155 | complete(&fs->kobj_unregister); | |
156 | } | |
157 | ||
158 | static void btrfs_root_release(struct kobject *kobj) | |
159 | { | |
160 | struct btrfs_root *root = container_of(kobj, struct btrfs_root, | |
161 | root_kobj); | |
162 | complete(&root->kobj_unregister); | |
163 | } | |
164 | ||
165 | static struct sysfs_ops btrfs_super_attr_ops = { | |
166 | .show = btrfs_super_attr_show, | |
167 | .store = btrfs_super_attr_store, | |
168 | }; | |
169 | ||
170 | static struct sysfs_ops btrfs_root_attr_ops = { | |
171 | .show = btrfs_root_attr_show, | |
172 | .store = btrfs_root_attr_store, | |
173 | }; | |
174 | ||
175 | static struct kobj_type btrfs_root_ktype = { | |
176 | .default_attrs = btrfs_root_attrs, | |
177 | .sysfs_ops = &btrfs_root_attr_ops, | |
178 | .release = btrfs_root_release, | |
179 | }; | |
180 | ||
181 | static struct kobj_type btrfs_super_ktype = { | |
182 | .default_attrs = btrfs_super_attrs, | |
183 | .sysfs_ops = &btrfs_super_attr_ops, | |
184 | .release = btrfs_super_release, | |
185 | }; | |
186 | ||
b4a2a0ed | 187 | static struct kset btrfs_kset; |
58176a96 JB |
188 | |
189 | int btrfs_sysfs_add_super(struct btrfs_fs_info *fs) | |
190 | { | |
191 | int error; | |
6da6abae CM |
192 | char *name; |
193 | char c; | |
194 | int len = strlen(fs->sb->s_id) + 1; | |
195 | int i; | |
196 | ||
197 | name = kmalloc(len, GFP_NOFS); | |
198 | if (!name) { | |
199 | error = -ENOMEM; | |
200 | goto fail; | |
201 | } | |
202 | ||
203 | for (i = 0; i < len; i++) { | |
204 | c = fs->sb->s_id[i]; | |
205 | if (c == '/' || c == '\\') | |
206 | c = '!'; | |
207 | name[i] = c; | |
208 | } | |
209 | name[len] = '\0'; | |
58176a96 JB |
210 | |
211 | fs->super_kobj.kset = &btrfs_kset; | |
212 | fs->super_kobj.ktype = &btrfs_super_ktype; | |
213 | ||
6da6abae | 214 | error = kobject_set_name(&fs->super_kobj, "%s", name); |
58176a96 JB |
215 | if (error) |
216 | goto fail; | |
217 | ||
218 | error = kobject_register(&fs->super_kobj); | |
219 | if (error) | |
220 | goto fail; | |
221 | ||
6da6abae | 222 | kfree(name); |
58176a96 JB |
223 | return 0; |
224 | ||
225 | fail: | |
6da6abae | 226 | kfree(name); |
58176a96 JB |
227 | printk(KERN_ERR "btrfs: sysfs creation for super failed\n"); |
228 | return error; | |
229 | } | |
230 | ||
231 | int btrfs_sysfs_add_root(struct btrfs_root *root) | |
232 | { | |
233 | int error; | |
234 | ||
235 | root->root_kobj.ktype = &btrfs_root_ktype; | |
236 | root->root_kobj.parent = &root->fs_info->super_kobj; | |
237 | ||
238 | error = kobject_set_name(&root->root_kobj, "%s", root->name); | |
239 | if (error) { | |
240 | goto fail; | |
241 | } | |
242 | ||
243 | error = kobject_register(&root->root_kobj); | |
244 | if (error) | |
245 | goto fail; | |
246 | ||
247 | return 0; | |
248 | ||
249 | fail: | |
250 | printk(KERN_ERR "btrfs: sysfs creation for root failed\n"); | |
251 | return error; | |
252 | } | |
253 | ||
254 | void btrfs_sysfs_del_root(struct btrfs_root *root) | |
255 | { | |
256 | kobject_unregister(&root->root_kobj); | |
257 | wait_for_completion(&root->kobj_unregister); | |
258 | } | |
259 | ||
260 | void btrfs_sysfs_del_super(struct btrfs_fs_info *fs) | |
261 | { | |
262 | kobject_unregister(&fs->super_kobj); | |
263 | wait_for_completion(&fs->kobj_unregister); | |
264 | } | |
265 | ||
266 | int btrfs_init_sysfs() | |
267 | { | |
268 | kobj_set_kset_s(&btrfs_kset, fs_subsys); | |
b4a2a0ed | 269 | kobject_set_name(&btrfs_kset.kobj, "btrfs"); |
58176a96 JB |
270 | return kset_register(&btrfs_kset); |
271 | } | |
272 | ||
273 | void btrfs_exit_sysfs() | |
274 | { | |
275 | kset_unregister(&btrfs_kset); | |
276 | } |