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Commit | Line | Data |
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3d824a46 | 1 | /* inode.c: /proc/openprom handling routines |
1da177e4 LT |
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> | |
1da177e4 LT |
11 | #include <linux/init.h> |
12 | #include <linux/slab.h> | |
3d824a46 | 13 | #include <linux/seq_file.h> |
e18fa700 | 14 | #include <linux/magic.h> |
1da177e4 LT |
15 | |
16 | #include <asm/openprom.h> | |
17 | #include <asm/oplib.h> | |
3d824a46 | 18 | #include <asm/prom.h> |
1da177e4 LT |
19 | #include <asm/uaccess.h> |
20 | ||
3d824a46 | 21 | static DEFINE_MUTEX(op_mutex); |
1da177e4 | 22 | |
3d824a46 | 23 | #define OPENPROM_ROOT_INO 0 |
a04ee146 | 24 | |
3d824a46 DM |
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 | ||
b88a27ed DH |
41 | static struct inode *openprom_iget(struct super_block *sb, ino_t ino); |
42 | ||
3d824a46 | 43 | static inline struct op_inode_info *OP_I(struct inode *inode) |
1da177e4 | 44 | { |
3d824a46 | 45 | return container_of(inode, struct op_inode_info, vfs_inode); |
1da177e4 LT |
46 | } |
47 | ||
3d824a46 | 48 | static int is_string(unsigned char *p, int len) |
1da177e4 | 49 | { |
3d824a46 | 50 | int i; |
1da177e4 | 51 | |
3d824a46 DM |
52 | for (i = 0; i < len; i++) { |
53 | unsigned char val = p[i]; | |
1da177e4 | 54 | |
3d824a46 DM |
55 | if ((i && !val) || |
56 | (val >= ' ' && val <= '~')) | |
57 | continue; | |
1da177e4 | 58 | |
3d824a46 DM |
59 | return 0; |
60 | } | |
1da177e4 | 61 | |
3d824a46 DM |
62 | return 1; |
63 | } | |
1da177e4 | 64 | |
3d824a46 DM |
65 | static int property_show(struct seq_file *f, void *v) |
66 | { | |
67 | struct property *prop = f->private; | |
68 | void *pval; | |
69 | int len; | |
1da177e4 | 70 | |
3d824a46 DM |
71 | len = prop->length; |
72 | pval = prop->value; | |
1da177e4 | 73 | |
3d824a46 DM |
74 | if (is_string(pval, len)) { |
75 | while (len > 0) { | |
76 | int n = strlen(pval); | |
1da177e4 | 77 | |
3d824a46 | 78 | seq_printf(f, "%s", (char *) pval); |
1da177e4 | 79 | |
3d824a46 DM |
80 | /* Skip over the NULL byte too. */ |
81 | pval += n + 1; | |
82 | len -= n + 1; | |
1da177e4 | 83 | |
3d824a46 DM |
84 | if (len > 0) |
85 | seq_printf(f, " + "); | |
1da177e4 | 86 | } |
3d824a46 DM |
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++; | |
1da177e4 LT |
98 | } |
99 | } else { | |
3d824a46 DM |
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; | |
1da177e4 | 110 | } |
1da177e4 LT |
111 | } |
112 | } | |
3d824a46 DM |
113 | seq_printf(f, "\n"); |
114 | ||
115 | return 0; | |
1da177e4 LT |
116 | } |
117 | ||
3d824a46 | 118 | static void *property_start(struct seq_file *f, loff_t *pos) |
1da177e4 | 119 | { |
3d824a46 DM |
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 | ||
872e2be7 | 136 | static const struct seq_operations property_op = { |
3d824a46 DM |
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; | |
1da177e4 | 154 | } |
3d824a46 | 155 | return ret; |
1da177e4 LT |
156 | } |
157 | ||
4b6f5d20 | 158 | static const struct file_operations openpromfs_prop_ops = { |
3d824a46 DM |
159 | .open = property_open, |
160 | .read = seq_read, | |
161 | .llseek = seq_lseek, | |
162 | .release = seq_release, | |
1da177e4 LT |
163 | }; |
164 | ||
68c61471 | 165 | static int openpromfs_readdir(struct file *, struct dir_context *); |
1da177e4 | 166 | |
4b6f5d20 | 167 | static const struct file_operations openprom_operations = { |
1da177e4 | 168 | .read = generic_read_dir, |
c51da20c | 169 | .iterate_shared = openpromfs_readdir, |
3222a3e5 | 170 | .llseek = generic_file_llseek, |
1da177e4 LT |
171 | }; |
172 | ||
00cd8dd3 | 173 | static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, unsigned int); |
1da177e4 | 174 | |
92e1d5be | 175 | static const struct inode_operations openprom_inode_operations = { |
1da177e4 LT |
176 | .lookup = openpromfs_lookup, |
177 | }; | |
178 | ||
00cd8dd3 | 179 | static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 | 180 | { |
3d824a46 DM |
181 | struct op_inode_info *ent_oi, *oi = OP_I(dir); |
182 | struct device_node *dp, *child; | |
183 | struct property *prop; | |
184 | enum op_inode_type ent_type; | |
185 | union op_inode_data ent_data; | |
1da177e4 | 186 | const char *name; |
1da177e4 | 187 | struct inode *inode; |
3d824a46 DM |
188 | unsigned int ino; |
189 | int len; | |
1da177e4 | 190 | |
3d824a46 DM |
191 | BUG_ON(oi->type != op_inode_node); |
192 | ||
193 | dp = oi->u.node; | |
194 | ||
1da177e4 LT |
195 | name = dentry->d_name.name; |
196 | len = dentry->d_name.len; | |
3d824a46 DM |
197 | |
198 | mutex_lock(&op_mutex); | |
199 | ||
200 | child = dp->child; | |
201 | while (child) { | |
202 | int n = strlen(child->path_component_name); | |
203 | ||
204 | if (len == n && | |
205 | !strncmp(child->path_component_name, name, len)) { | |
206 | ent_type = op_inode_node; | |
207 | ent_data.node = child; | |
208 | ino = child->unique_id; | |
209 | goto found; | |
1da177e4 | 210 | } |
3d824a46 | 211 | child = child->sibling; |
1da177e4 | 212 | } |
3d824a46 DM |
213 | |
214 | prop = dp->properties; | |
215 | while (prop) { | |
216 | int n = strlen(prop->name); | |
217 | ||
218 | if (len == n && !strncmp(prop->name, name, len)) { | |
219 | ent_type = op_inode_prop; | |
220 | ent_data.prop = prop; | |
221 | ino = prop->unique_id; | |
222 | goto found; | |
1da177e4 | 223 | } |
3d824a46 DM |
224 | |
225 | prop = prop->next; | |
1da177e4 | 226 | } |
3d824a46 DM |
227 | |
228 | mutex_unlock(&op_mutex); | |
229 | return ERR_PTR(-ENOENT); | |
230 | ||
231 | found: | |
b88a27ed | 232 | inode = openprom_iget(dir->i_sb, ino); |
3d824a46 | 233 | mutex_unlock(&op_mutex); |
b88a27ed DH |
234 | if (IS_ERR(inode)) |
235 | return ERR_CAST(inode); | |
3d824a46 DM |
236 | ent_oi = OP_I(inode); |
237 | ent_oi->type = ent_type; | |
238 | ent_oi->u = ent_data; | |
239 | ||
240 | switch (ent_type) { | |
241 | case op_inode_node: | |
1da177e4 | 242 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; |
3d824a46 | 243 | inode->i_op = &openprom_inode_operations; |
1da177e4 | 244 | inode->i_fop = &openprom_operations; |
bfe86848 | 245 | set_nlink(inode, 2); |
1da177e4 | 246 | break; |
3d824a46 DM |
247 | case op_inode_prop: |
248 | if (!strcmp(dp->name, "options") && (len == 17) && | |
249 | !strncmp (name, "security-password", 17)) | |
1da177e4 | 250 | inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR; |
3d824a46 | 251 | else |
1da177e4 | 252 | inode->i_mode = S_IFREG | S_IRUGO; |
1da177e4 | 253 | inode->i_fop = &openpromfs_prop_ops; |
bfe86848 | 254 | set_nlink(inode, 1); |
3d824a46 | 255 | inode->i_size = ent_oi->u.prop->length; |
1da177e4 LT |
256 | break; |
257 | } | |
258 | ||
1da177e4 LT |
259 | d_add(dentry, inode); |
260 | return NULL; | |
261 | } | |
262 | ||
68c61471 | 263 | static int openpromfs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 264 | { |
68c61471 | 265 | struct inode *inode = file_inode(file); |
3d824a46 DM |
266 | struct op_inode_info *oi = OP_I(inode); |
267 | struct device_node *dp = oi->u.node; | |
268 | struct device_node *child; | |
269 | struct property *prop; | |
3d824a46 DM |
270 | int i; |
271 | ||
272 | mutex_lock(&op_mutex); | |
1da177e4 | 273 | |
68c61471 AV |
274 | if (ctx->pos == 0) { |
275 | if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR)) | |
3d824a46 | 276 | goto out; |
68c61471 AV |
277 | ctx->pos = 1; |
278 | } | |
279 | if (ctx->pos == 1) { | |
280 | if (!dir_emit(ctx, "..", 2, | |
3d824a46 DM |
281 | (dp->parent == NULL ? |
282 | OPENPROM_ROOT_INO : | |
68c61471 | 283 | dp->parent->unique_id), DT_DIR)) |
1da177e4 | 284 | goto out; |
68c61471 AV |
285 | ctx->pos = 2; |
286 | } | |
287 | i = ctx->pos - 2; | |
3d824a46 | 288 | |
68c61471 AV |
289 | /* First, the children nodes as directories. */ |
290 | child = dp->child; | |
291 | while (i && child) { | |
292 | child = child->sibling; | |
293 | i--; | |
294 | } | |
295 | while (child) { | |
296 | if (!dir_emit(ctx, | |
297 | child->path_component_name, | |
298 | strlen(child->path_component_name), | |
299 | child->unique_id, DT_DIR)) | |
300 | goto out; | |
3d824a46 | 301 | |
68c61471 AV |
302 | ctx->pos++; |
303 | child = child->sibling; | |
304 | } | |
305 | ||
306 | /* Next, the properties as files. */ | |
307 | prop = dp->properties; | |
308 | while (i && prop) { | |
309 | prop = prop->next; | |
310 | i--; | |
1da177e4 | 311 | } |
68c61471 AV |
312 | while (prop) { |
313 | if (!dir_emit(ctx, prop->name, strlen(prop->name), | |
314 | prop->unique_id, DT_REG)) | |
315 | goto out; | |
316 | ||
317 | ctx->pos++; | |
318 | prop = prop->next; | |
319 | } | |
320 | ||
1da177e4 | 321 | out: |
3d824a46 | 322 | mutex_unlock(&op_mutex); |
1da177e4 LT |
323 | return 0; |
324 | } | |
325 | ||
e18b890b | 326 | static struct kmem_cache *op_inode_cachep; |
1da177e4 | 327 | |
3d824a46 | 328 | static struct inode *openprom_alloc_inode(struct super_block *sb) |
1da177e4 | 329 | { |
3d824a46 | 330 | struct op_inode_info *oi; |
1da177e4 | 331 | |
e94b1766 | 332 | oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL); |
3d824a46 DM |
333 | if (!oi) |
334 | return NULL; | |
1da177e4 | 335 | |
3d824a46 | 336 | return &oi->vfs_inode; |
1da177e4 LT |
337 | } |
338 | ||
fa0d7e3d | 339 | static void openprom_i_callback(struct rcu_head *head) |
1da177e4 | 340 | { |
fa0d7e3d | 341 | struct inode *inode = container_of(head, struct inode, i_rcu); |
3d824a46 | 342 | kmem_cache_free(op_inode_cachep, OP_I(inode)); |
1da177e4 LT |
343 | } |
344 | ||
fa0d7e3d NP |
345 | static void openprom_destroy_inode(struct inode *inode) |
346 | { | |
347 | call_rcu(&inode->i_rcu, openprom_i_callback); | |
348 | } | |
349 | ||
b88a27ed | 350 | static struct inode *openprom_iget(struct super_block *sb, ino_t ino) |
1da177e4 | 351 | { |
b88a27ed DH |
352 | struct inode *inode; |
353 | ||
354 | inode = iget_locked(sb, ino); | |
355 | if (!inode) | |
356 | return ERR_PTR(-ENOMEM); | |
357 | if (inode->i_state & I_NEW) { | |
358 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
359 | if (inode->i_ino == OPENPROM_ROOT_INO) { | |
360 | inode->i_op = &openprom_inode_operations; | |
361 | inode->i_fop = &openprom_operations; | |
362 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
363 | } | |
364 | unlock_new_inode(inode); | |
1da177e4 | 365 | } |
b88a27ed | 366 | return inode; |
1da177e4 LT |
367 | } |
368 | ||
369 | static int openprom_remount(struct super_block *sb, int *flags, char *data) | |
370 | { | |
02b9984d | 371 | sync_filesystem(sb); |
1da177e4 LT |
372 | *flags |= MS_NOATIME; |
373 | return 0; | |
374 | } | |
375 | ||
ee9b6d61 | 376 | static const struct super_operations openprom_sops = { |
3d824a46 DM |
377 | .alloc_inode = openprom_alloc_inode, |
378 | .destroy_inode = openprom_destroy_inode, | |
1da177e4 LT |
379 | .statfs = simple_statfs, |
380 | .remount_fs = openprom_remount, | |
381 | }; | |
382 | ||
383 | static int openprom_fill_super(struct super_block *s, void *data, int silent) | |
384 | { | |
3d824a46 DM |
385 | struct inode *root_inode; |
386 | struct op_inode_info *oi; | |
b88a27ed | 387 | int ret; |
1da177e4 LT |
388 | |
389 | s->s_flags |= MS_NOATIME; | |
390 | s->s_blocksize = 1024; | |
391 | s->s_blocksize_bits = 10; | |
392 | s->s_magic = OPENPROM_SUPER_MAGIC; | |
393 | s->s_op = &openprom_sops; | |
394 | s->s_time_gran = 1; | |
b88a27ed DH |
395 | root_inode = openprom_iget(s, OPENPROM_ROOT_INO); |
396 | if (IS_ERR(root_inode)) { | |
397 | ret = PTR_ERR(root_inode); | |
1da177e4 | 398 | goto out_no_root; |
b88a27ed | 399 | } |
3d824a46 DM |
400 | |
401 | oi = OP_I(root_inode); | |
402 | oi->type = op_inode_node; | |
403 | oi->u.node = of_find_node_by_path("/"); | |
404 | ||
48fde701 | 405 | s->s_root = d_make_root(root_inode); |
1da177e4 | 406 | if (!s->s_root) |
b88a27ed | 407 | goto out_no_root_dentry; |
1da177e4 LT |
408 | return 0; |
409 | ||
b88a27ed | 410 | out_no_root_dentry: |
b88a27ed | 411 | ret = -ENOMEM; |
1da177e4 LT |
412 | out_no_root: |
413 | printk("openprom_fill_super: get root inode failed\n"); | |
b88a27ed | 414 | return ret; |
1da177e4 LT |
415 | } |
416 | ||
fc14f2fe AV |
417 | static struct dentry *openprom_mount(struct file_system_type *fs_type, |
418 | int flags, const char *dev_name, void *data) | |
1da177e4 | 419 | { |
0e154825 | 420 | return mount_single(fs_type, flags, data, openprom_fill_super); |
1da177e4 LT |
421 | } |
422 | ||
423 | static struct file_system_type openprom_fs_type = { | |
424 | .owner = THIS_MODULE, | |
425 | .name = "openpromfs", | |
fc14f2fe | 426 | .mount = openprom_mount, |
1da177e4 LT |
427 | .kill_sb = kill_anon_super, |
428 | }; | |
7f78e035 | 429 | MODULE_ALIAS_FS("openpromfs"); |
1da177e4 | 430 | |
51cc5068 | 431 | static void op_inode_init_once(void *data) |
3d824a46 DM |
432 | { |
433 | struct op_inode_info *oi = (struct op_inode_info *) data; | |
434 | ||
a35afb83 | 435 | inode_init_once(&oi->vfs_inode); |
3d824a46 DM |
436 | } |
437 | ||
1da177e4 LT |
438 | static int __init init_openprom_fs(void) |
439 | { | |
3d824a46 DM |
440 | int err; |
441 | ||
442 | op_inode_cachep = kmem_cache_create("op_inode_cache", | |
443 | sizeof(struct op_inode_info), | |
444 | 0, | |
445 | (SLAB_RECLAIM_ACCOUNT | | |
5d097056 | 446 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), |
20c2df83 | 447 | op_inode_init_once); |
3d824a46 DM |
448 | if (!op_inode_cachep) |
449 | return -ENOMEM; | |
450 | ||
451 | err = register_filesystem(&openprom_fs_type); | |
452 | if (err) | |
453 | kmem_cache_destroy(op_inode_cachep); | |
454 | ||
455 | return err; | |
1da177e4 LT |
456 | } |
457 | ||
458 | static void __exit exit_openprom_fs(void) | |
459 | { | |
1da177e4 | 460 | unregister_filesystem(&openprom_fs_type); |
8c0a8537 KS |
461 | /* |
462 | * Make sure all delayed rcu free inodes are flushed before we | |
463 | * destroy cache. | |
464 | */ | |
465 | rcu_barrier(); | |
3d824a46 | 466 | kmem_cache_destroy(op_inode_cachep); |
1da177e4 LT |
467 | } |
468 | ||
469 | module_init(init_openprom_fs) | |
470 | module_exit(exit_openprom_fs) | |
471 | MODULE_LICENSE("GPL"); |