Root/
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 | .llseek = generic_file_llseek, |
171 | }; |
172 | |
173 | static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
174 | |
175 | static const struct inode_operations openprom_inode_operations = { |
176 | .lookup = openpromfs_lookup, |
177 | }; |
178 | |
179 | static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
180 | { |
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; |
186 | const char *name; |
187 | struct inode *inode; |
188 | unsigned int ino; |
189 | int len; |
190 | |
191 | BUG_ON(oi->type != op_inode_node); |
192 | |
193 | dp = oi->u.node; |
194 | |
195 | name = dentry->d_name.name; |
196 | len = dentry->d_name.len; |
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; |
210 | } |
211 | child = child->sibling; |
212 | } |
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; |
223 | } |
224 | |
225 | prop = prop->next; |
226 | } |
227 | |
228 | mutex_unlock(&op_mutex); |
229 | return ERR_PTR(-ENOENT); |
230 | |
231 | found: |
232 | inode = openprom_iget(dir->i_sb, ino); |
233 | mutex_unlock(&op_mutex); |
234 | if (IS_ERR(inode)) |
235 | return ERR_CAST(inode); |
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: |
242 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; |
243 | inode->i_op = &openprom_inode_operations; |
244 | inode->i_fop = &openprom_operations; |
245 | inode->i_nlink = 2; |
246 | break; |
247 | case op_inode_prop: |
248 | if (!strcmp(dp->name, "options") && (len == 17) && |
249 | !strncmp (name, "security-password", 17)) |
250 | inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR; |
251 | else |
252 | inode->i_mode = S_IFREG | S_IRUGO; |
253 | inode->i_fop = &openpromfs_prop_ops; |
254 | inode->i_nlink = 1; |
255 | inode->i_size = ent_oi->u.prop->length; |
256 | break; |
257 | } |
258 | |
259 | d_add(dentry, inode); |
260 | return NULL; |
261 | } |
262 | |
263 | static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir) |
264 | { |
265 | struct inode *inode = filp->f_path.dentry->d_inode; |
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; |
270 | unsigned int ino; |
271 | int i; |
272 | |
273 | mutex_lock(&op_mutex); |
274 | |
275 | ino = inode->i_ino; |
276 | i = filp->f_pos; |
277 | switch (i) { |
278 | case 0: |
279 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
280 | goto out; |
281 | i++; |
282 | filp->f_pos++; |
283 | /* fall thru */ |
284 | case 1: |
285 | if (filldir(dirent, "..", 2, i, |
286 | (dp->parent == NULL ? |
287 | OPENPROM_ROOT_INO : |
288 | dp->parent->unique_id), DT_DIR) < 0) |
289 | goto out; |
290 | i++; |
291 | filp->f_pos++; |
292 | /* fall thru */ |
293 | default: |
294 | i -= 2; |
295 | |
296 | /* First, the children nodes as directories. */ |
297 | child = dp->child; |
298 | while (i && child) { |
299 | child = child->sibling; |
300 | i--; |
301 | } |
302 | while (child) { |
303 | if (filldir(dirent, |
304 | child->path_component_name, |
305 | strlen(child->path_component_name), |
306 | filp->f_pos, child->unique_id, DT_DIR) < 0) |
307 | goto out; |
308 | |
309 | filp->f_pos++; |
310 | child = child->sibling; |
311 | } |
312 | |
313 | /* Next, the properties as files. */ |
314 | prop = dp->properties; |
315 | while (i && prop) { |
316 | prop = prop->next; |
317 | i--; |
318 | } |
319 | while (prop) { |
320 | if (filldir(dirent, prop->name, strlen(prop->name), |
321 | filp->f_pos, prop->unique_id, DT_REG) < 0) |
322 | goto out; |
323 | |
324 | filp->f_pos++; |
325 | prop = prop->next; |
326 | } |
327 | } |
328 | out: |
329 | mutex_unlock(&op_mutex); |
330 | return 0; |
331 | } |
332 | |
333 | static struct kmem_cache *op_inode_cachep; |
334 | |
335 | static struct inode *openprom_alloc_inode(struct super_block *sb) |
336 | { |
337 | struct op_inode_info *oi; |
338 | |
339 | oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL); |
340 | if (!oi) |
341 | return NULL; |
342 | |
343 | return &oi->vfs_inode; |
344 | } |
345 | |
346 | static void openprom_destroy_inode(struct inode *inode) |
347 | { |
348 | kmem_cache_free(op_inode_cachep, OP_I(inode)); |
349 | } |
350 | |
351 | static struct inode *openprom_iget(struct super_block *sb, ino_t ino) |
352 | { |
353 | struct inode *inode; |
354 | |
355 | inode = iget_locked(sb, ino); |
356 | if (!inode) |
357 | return ERR_PTR(-ENOMEM); |
358 | if (inode->i_state & I_NEW) { |
359 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
360 | if (inode->i_ino == OPENPROM_ROOT_INO) { |
361 | inode->i_op = &openprom_inode_operations; |
362 | inode->i_fop = &openprom_operations; |
363 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; |
364 | } |
365 | unlock_new_inode(inode); |
366 | } |
367 | return inode; |
368 | } |
369 | |
370 | static int openprom_remount(struct super_block *sb, int *flags, char *data) |
371 | { |
372 | *flags |= MS_NOATIME; |
373 | return 0; |
374 | } |
375 | |
376 | static const struct super_operations openprom_sops = { |
377 | .alloc_inode = openprom_alloc_inode, |
378 | .destroy_inode = openprom_destroy_inode, |
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 | { |
385 | struct inode *root_inode; |
386 | struct op_inode_info *oi; |
387 | int ret; |
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; |
395 | root_inode = openprom_iget(s, OPENPROM_ROOT_INO); |
396 | if (IS_ERR(root_inode)) { |
397 | ret = PTR_ERR(root_inode); |
398 | goto out_no_root; |
399 | } |
400 | |
401 | oi = OP_I(root_inode); |
402 | oi->type = op_inode_node; |
403 | oi->u.node = of_find_node_by_path("/"); |
404 | |
405 | s->s_root = d_alloc_root(root_inode); |
406 | if (!s->s_root) |
407 | goto out_no_root_dentry; |
408 | return 0; |
409 | |
410 | out_no_root_dentry: |
411 | iput(root_inode); |
412 | ret = -ENOMEM; |
413 | out_no_root: |
414 | printk("openprom_fill_super: get root inode failed\n"); |
415 | return ret; |
416 | } |
417 | |
418 | static int openprom_get_sb(struct file_system_type *fs_type, |
419 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
420 | { |
421 | return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt); |
422 | } |
423 | |
424 | static struct file_system_type openprom_fs_type = { |
425 | .owner = THIS_MODULE, |
426 | .name = "openpromfs", |
427 | .get_sb = openprom_get_sb, |
428 | .kill_sb = kill_anon_super, |
429 | }; |
430 | |
431 | static void op_inode_init_once(void *data) |
432 | { |
433 | struct op_inode_info *oi = (struct op_inode_info *) data; |
434 | |
435 | inode_init_once(&oi->vfs_inode); |
436 | } |
437 | |
438 | static int __init init_openprom_fs(void) |
439 | { |
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 | |
446 | SLAB_MEM_SPREAD), |
447 | op_inode_init_once); |
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; |
456 | } |
457 | |
458 | static void __exit exit_openprom_fs(void) |
459 | { |
460 | unregister_filesystem(&openprom_fs_type); |
461 | kmem_cache_destroy(op_inode_cachep); |
462 | } |
463 | |
464 | module_init(init_openprom_fs) |
465 | module_exit(exit_openprom_fs) |
466 | MODULE_LICENSE("GPL"); |
467 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9