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SL*B: drop kmem cache argument from constructor
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1 /* inode.c: /proc/openprom handling routines
2 *
3 * Copyright (C) 1996-1999 Jakub Jelinek (jakub@redhat.com)
4 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
5 */
6
7 #include <linux/module.h>
8 #include <linux/types.h>
9 #include <linux/string.h>
10 #include <linux/fs.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <linux/seq_file.h>
14 #include <linux/magic.h>
15
16 #include <asm/openprom.h>
17 #include <asm/oplib.h>
18 #include <asm/prom.h>
19 #include <asm/uaccess.h>
20
21 static DEFINE_MUTEX(op_mutex);
22
23 #define OPENPROM_ROOT_INO 0
24
25 enum op_inode_type {
26 op_inode_node,
27 op_inode_prop,
28 };
29
30 union op_inode_data {
31 struct device_node *node;
32 struct property *prop;
33 };
34
35 struct op_inode_info {
36 struct inode vfs_inode;
37 enum op_inode_type type;
38 union op_inode_data u;
39 };
40
41 static struct inode *openprom_iget(struct super_block *sb, ino_t ino);
42
43 static inline struct op_inode_info *OP_I(struct inode *inode)
44 {
45 return container_of(inode, struct op_inode_info, vfs_inode);
46 }
47
48 static int is_string(unsigned char *p, int len)
49 {
50 int i;
51
52 for (i = 0; i < len; i++) {
53 unsigned char val = p[i];
54
55 if ((i && !val) ||
56 (val >= ' ' && val <= '~'))
57 continue;
58
59 return 0;
60 }
61
62 return 1;
63 }
64
65 static int property_show(struct seq_file *f, void *v)
66 {
67 struct property *prop = f->private;
68 void *pval;
69 int len;
70
71 len = prop->length;
72 pval = prop->value;
73
74 if (is_string(pval, len)) {
75 while (len > 0) {
76 int n = strlen(pval);
77
78 seq_printf(f, "%s", (char *) pval);
79
80 /* Skip over the NULL byte too. */
81 pval += n + 1;
82 len -= n + 1;
83
84 if (len > 0)
85 seq_printf(f, " + ");
86 }
87 } else {
88 if (len & 3) {
89 while (len) {
90 len--;
91 if (len)
92 seq_printf(f, "%02x.",
93 *(unsigned char *) pval);
94 else
95 seq_printf(f, "%02x",
96 *(unsigned char *) pval);
97 pval++;
98 }
99 } else {
100 while (len >= 4) {
101 len -= 4;
102
103 if (len)
104 seq_printf(f, "%08x.",
105 *(unsigned int *) pval);
106 else
107 seq_printf(f, "%08x",
108 *(unsigned int *) pval);
109 pval += 4;
110 }
111 }
112 }
113 seq_printf(f, "\n");
114
115 return 0;
116 }
117
118 static void *property_start(struct seq_file *f, loff_t *pos)
119 {
120 if (*pos == 0)
121 return pos;
122 return NULL;
123 }
124
125 static void *property_next(struct seq_file *f, void *v, loff_t *pos)
126 {
127 (*pos)++;
128 return NULL;
129 }
130
131 static void property_stop(struct seq_file *f, void *v)
132 {
133 /* Nothing to do */
134 }
135
136 static const struct seq_operations property_op = {
137 .start = property_start,
138 .next = property_next,
139 .stop = property_stop,
140 .show = property_show
141 };
142
143 static int property_open(struct inode *inode, struct file *file)
144 {
145 struct op_inode_info *oi = OP_I(inode);
146 int ret;
147
148 BUG_ON(oi->type != op_inode_prop);
149
150 ret = seq_open(file, &property_op);
151 if (!ret) {
152 struct seq_file *m = file->private_data;
153 m->private = oi->u.prop;
154 }
155 return ret;
156 }
157
158 static const struct file_operations openpromfs_prop_ops = {
159 .open = property_open,
160 .read = seq_read,
161 .llseek = seq_lseek,
162 .release = seq_release,
163 };
164
165 static int openpromfs_readdir(struct file *, void *, filldir_t);
166
167 static const struct file_operations openprom_operations = {
168 .read = generic_read_dir,
169 .readdir = openpromfs_readdir,
170 };
171
172 static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *);
173
174 static const struct inode_operations openprom_inode_operations = {
175 .lookup = openpromfs_lookup,
176 };
177
178 static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
179 {
180 struct op_inode_info *ent_oi, *oi = OP_I(dir);
181 struct device_node *dp, *child;
182 struct property *prop;
183 enum op_inode_type ent_type;
184 union op_inode_data ent_data;
185 const char *name;
186 struct inode *inode;
187 unsigned int ino;
188 int len;
189
190 BUG_ON(oi->type != op_inode_node);
191
192 dp = oi->u.node;
193
194 name = dentry->d_name.name;
195 len = dentry->d_name.len;
196
197 mutex_lock(&op_mutex);
198
199 child = dp->child;
200 while (child) {
201 int n = strlen(child->path_component_name);
202
203 if (len == n &&
204 !strncmp(child->path_component_name, name, len)) {
205 ent_type = op_inode_node;
206 ent_data.node = child;
207 ino = child->unique_id;
208 goto found;
209 }
210 child = child->sibling;
211 }
212
213 prop = dp->properties;
214 while (prop) {
215 int n = strlen(prop->name);
216
217 if (len == n && !strncmp(prop->name, name, len)) {
218 ent_type = op_inode_prop;
219 ent_data.prop = prop;
220 ino = prop->unique_id;
221 goto found;
222 }
223
224 prop = prop->next;
225 }
226
227 mutex_unlock(&op_mutex);
228 return ERR_PTR(-ENOENT);
229
230 found:
231 inode = openprom_iget(dir->i_sb, ino);
232 mutex_unlock(&op_mutex);
233 if (IS_ERR(inode))
234 return ERR_CAST(inode);
235 ent_oi = OP_I(inode);
236 ent_oi->type = ent_type;
237 ent_oi->u = ent_data;
238
239 switch (ent_type) {
240 case op_inode_node:
241 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
242 inode->i_op = &openprom_inode_operations;
243 inode->i_fop = &openprom_operations;
244 inode->i_nlink = 2;
245 break;
246 case op_inode_prop:
247 if (!strcmp(dp->name, "options") && (len == 17) &&
248 !strncmp (name, "security-password", 17))
249 inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
250 else
251 inode->i_mode = S_IFREG | S_IRUGO;
252 inode->i_fop = &openpromfs_prop_ops;
253 inode->i_nlink = 1;
254 inode->i_size = ent_oi->u.prop->length;
255 break;
256 }
257
258 inode->i_gid = 0;
259 inode->i_uid = 0;
260
261 d_add(dentry, inode);
262 return NULL;
263 }
264
265 static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
266 {
267 struct inode *inode = filp->f_path.dentry->d_inode;
268 struct op_inode_info *oi = OP_I(inode);
269 struct device_node *dp = oi->u.node;
270 struct device_node *child;
271 struct property *prop;
272 unsigned int ino;
273 int i;
274
275 mutex_lock(&op_mutex);
276
277 ino = inode->i_ino;
278 i = filp->f_pos;
279 switch (i) {
280 case 0:
281 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
282 goto out;
283 i++;
284 filp->f_pos++;
285 /* fall thru */
286 case 1:
287 if (filldir(dirent, "..", 2, i,
288 (dp->parent == NULL ?
289 OPENPROM_ROOT_INO :
290 dp->parent->unique_id), DT_DIR) < 0)
291 goto out;
292 i++;
293 filp->f_pos++;
294 /* fall thru */
295 default:
296 i -= 2;
297
298 /* First, the children nodes as directories. */
299 child = dp->child;
300 while (i && child) {
301 child = child->sibling;
302 i--;
303 }
304 while (child) {
305 if (filldir(dirent,
306 child->path_component_name,
307 strlen(child->path_component_name),
308 filp->f_pos, child->unique_id, DT_DIR) < 0)
309 goto out;
310
311 filp->f_pos++;
312 child = child->sibling;
313 }
314
315 /* Next, the properties as files. */
316 prop = dp->properties;
317 while (i && prop) {
318 prop = prop->next;
319 i--;
320 }
321 while (prop) {
322 if (filldir(dirent, prop->name, strlen(prop->name),
323 filp->f_pos, prop->unique_id, DT_REG) < 0)
324 goto out;
325
326 filp->f_pos++;
327 prop = prop->next;
328 }
329 }
330 out:
331 mutex_unlock(&op_mutex);
332 return 0;
333 }
334
335 static struct kmem_cache *op_inode_cachep;
336
337 static struct inode *openprom_alloc_inode(struct super_block *sb)
338 {
339 struct op_inode_info *oi;
340
341 oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL);
342 if (!oi)
343 return NULL;
344
345 return &oi->vfs_inode;
346 }
347
348 static void openprom_destroy_inode(struct inode *inode)
349 {
350 kmem_cache_free(op_inode_cachep, OP_I(inode));
351 }
352
353 static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
354 {
355 struct inode *inode;
356
357 inode = iget_locked(sb, ino);
358 if (!inode)
359 return ERR_PTR(-ENOMEM);
360 if (inode->i_state & I_NEW) {
361 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
362 if (inode->i_ino == OPENPROM_ROOT_INO) {
363 inode->i_op = &openprom_inode_operations;
364 inode->i_fop = &openprom_operations;
365 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
366 }
367 unlock_new_inode(inode);
368 }
369 return inode;
370 }
371
372 static int openprom_remount(struct super_block *sb, int *flags, char *data)
373 {
374 *flags |= MS_NOATIME;
375 return 0;
376 }
377
378 static const struct super_operations openprom_sops = {
379 .alloc_inode = openprom_alloc_inode,
380 .destroy_inode = openprom_destroy_inode,
381 .statfs = simple_statfs,
382 .remount_fs = openprom_remount,
383 };
384
385 static int openprom_fill_super(struct super_block *s, void *data, int silent)
386 {
387 struct inode *root_inode;
388 struct op_inode_info *oi;
389 int ret;
390
391 s->s_flags |= MS_NOATIME;
392 s->s_blocksize = 1024;
393 s->s_blocksize_bits = 10;
394 s->s_magic = OPENPROM_SUPER_MAGIC;
395 s->s_op = &openprom_sops;
396 s->s_time_gran = 1;
397 root_inode = openprom_iget(s, OPENPROM_ROOT_INO);
398 if (IS_ERR(root_inode)) {
399 ret = PTR_ERR(root_inode);
400 goto out_no_root;
401 }
402
403 oi = OP_I(root_inode);
404 oi->type = op_inode_node;
405 oi->u.node = of_find_node_by_path("/");
406
407 s->s_root = d_alloc_root(root_inode);
408 if (!s->s_root)
409 goto out_no_root_dentry;
410 return 0;
411
412 out_no_root_dentry:
413 iput(root_inode);
414 ret = -ENOMEM;
415 out_no_root:
416 printk("openprom_fill_super: get root inode failed\n");
417 return ret;
418 }
419
420 static int openprom_get_sb(struct file_system_type *fs_type,
421 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
422 {
423 return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt);
424 }
425
426 static struct file_system_type openprom_fs_type = {
427 .owner = THIS_MODULE,
428 .name = "openpromfs",
429 .get_sb = openprom_get_sb,
430 .kill_sb = kill_anon_super,
431 };
432
433 static void op_inode_init_once(void *data)
434 {
435 struct op_inode_info *oi = (struct op_inode_info *) data;
436
437 inode_init_once(&oi->vfs_inode);
438 }
439
440 static int __init init_openprom_fs(void)
441 {
442 int err;
443
444 op_inode_cachep = kmem_cache_create("op_inode_cache",
445 sizeof(struct op_inode_info),
446 0,
447 (SLAB_RECLAIM_ACCOUNT |
448 SLAB_MEM_SPREAD),
449 op_inode_init_once);
450 if (!op_inode_cachep)
451 return -ENOMEM;
452
453 err = register_filesystem(&openprom_fs_type);
454 if (err)
455 kmem_cache_destroy(op_inode_cachep);
456
457 return err;
458 }
459
460 static void __exit exit_openprom_fs(void)
461 {
462 unregister_filesystem(&openprom_fs_type);
463 kmem_cache_destroy(op_inode_cachep);
464 }
465
466 module_init(init_openprom_fs)
467 module_exit(exit_openprom_fs)
468 MODULE_LICENSE("GPL");