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-rw-r--r--fs/btrfs/sysfs.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
new file mode 100644
index 000000000000..300076e66765
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+++ b/fs/btrfs/sysfs.c
@@ -0,0 +1,268 @@
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
31static 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_used(&root->root_item));
35}
36
37static 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_limit(&root->root_item));
41}
42
43static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf)
44{
45
46 return snprintf(buf, PAGE_SIZE, "%llu\n",
47 (unsigned long long)btrfs_super_bytes_used(&fs->super_copy));
48}
49
50static ssize_t super_total_blocks_show(struct btrfs_fs_info *fs, char *buf)
51{
52 return snprintf(buf, PAGE_SIZE, "%llu\n",
53 (unsigned long long)btrfs_super_total_bytes(&fs->super_copy));
54}
55
56static ssize_t super_blocksize_show(struct btrfs_fs_info *fs, char *buf)
57{
58 return snprintf(buf, PAGE_SIZE, "%llu\n",
59 (unsigned long long)btrfs_super_sectorsize(&fs->super_copy));
60}
61
62/* this is for root attrs (subvols/snapshots) */
63struct 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) \
70static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, show, store)
71
72ROOT_ATTR(blocks_used, 0444, root_blocks_used_show, NULL);
73ROOT_ATTR(block_limit, 0644, root_block_limit_show, NULL);
74
75static 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) */
82struct 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) \
89static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, show, store)
90
91SUPER_ATTR(blocks_used, 0444, super_blocks_used_show, NULL);
92SUPER_ATTR(total_blocks, 0444, super_total_blocks_show, NULL);
93SUPER_ATTR(blocksize, 0444, super_blocksize_show, NULL);
94
95static 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
102static 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
114static 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
127static 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
139static 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
151static 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
158static 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
165static struct sysfs_ops btrfs_super_attr_ops = {
166 .show = btrfs_super_attr_show,
167 .store = btrfs_super_attr_store,
168};
169
170static struct sysfs_ops btrfs_root_attr_ops = {
171 .show = btrfs_root_attr_show,
172 .store = btrfs_root_attr_store,
173};
174
175static 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
181static 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
187/* /sys/fs/btrfs/ entry */
188static struct kset *btrfs_kset;
189
190int btrfs_sysfs_add_super(struct btrfs_fs_info *fs)
191{
192 int error;
193 char *name;
194 char c;
195 int len = strlen(fs->sb->s_id) + 1;
196 int i;
197
198 name = kmalloc(len, GFP_NOFS);
199 if (!name) {
200 error = -ENOMEM;
201 goto fail;
202 }
203
204 for (i = 0; i < len; i++) {
205 c = fs->sb->s_id[i];
206 if (c == '/' || c == '\\')
207 c = '!';
208 name[i] = c;
209 }
210 name[len] = '\0';
211
212 fs->super_kobj.kset = btrfs_kset;
213 error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype,
214 NULL, "%s", name);
215 if (error)
216 goto fail;
217
218 kfree(name);
219 return 0;
220
221fail:
222 kfree(name);
223 printk(KERN_ERR "btrfs: sysfs creation for super failed\n");
224 return error;
225}
226
227int btrfs_sysfs_add_root(struct btrfs_root *root)
228{
229 int error;
230
231 error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype,
232 &root->fs_info->super_kobj,
233 "%s", root->name);
234 if (error)
235 goto fail;
236
237 return 0;
238
239fail:
240 printk(KERN_ERR "btrfs: sysfs creation for root failed\n");
241 return error;
242}
243
244void btrfs_sysfs_del_root(struct btrfs_root *root)
245{
246 kobject_put(&root->root_kobj);
247 wait_for_completion(&root->kobj_unregister);
248}
249
250void btrfs_sysfs_del_super(struct btrfs_fs_info *fs)
251{
252 kobject_put(&fs->super_kobj);
253 wait_for_completion(&fs->kobj_unregister);
254}
255
256int btrfs_init_sysfs(void)
257{
258 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
259 if (!btrfs_kset)
260 return -ENOMEM;
261 return 0;
262}
263
264void btrfs_exit_sysfs(void)
265{
266 kset_unregister(btrfs_kset);
267}
268
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-23 07:18:30 -0500