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