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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 | ||
41 | static inline struct op_inode_info *OP_I(struct inode *inode) | |
1da177e4 | 42 | { |
3d824a46 | 43 | return container_of(inode, struct op_inode_info, vfs_inode); |
1da177e4 LT |
44 | } |
45 | ||
3d824a46 | 46 | static int is_string(unsigned char *p, int len) |
1da177e4 | 47 | { |
3d824a46 | 48 | int i; |
1da177e4 | 49 | |
3d824a46 DM |
50 | for (i = 0; i < len; i++) { |
51 | unsigned char val = p[i]; | |
1da177e4 | 52 | |
3d824a46 DM |
53 | if ((i && !val) || |
54 | (val >= ' ' && val <= '~')) | |
55 | continue; | |
1da177e4 | 56 | |
3d824a46 DM |
57 | return 0; |
58 | } | |
1da177e4 | 59 | |
3d824a46 DM |
60 | return 1; |
61 | } | |
1da177e4 | 62 | |
3d824a46 DM |
63 | static int property_show(struct seq_file *f, void *v) |
64 | { | |
65 | struct property *prop = f->private; | |
66 | void *pval; | |
67 | int len; | |
1da177e4 | 68 | |
3d824a46 DM |
69 | len = prop->length; |
70 | pval = prop->value; | |
1da177e4 | 71 | |
3d824a46 DM |
72 | if (is_string(pval, len)) { |
73 | while (len > 0) { | |
74 | int n = strlen(pval); | |
1da177e4 | 75 | |
3d824a46 | 76 | seq_printf(f, "%s", (char *) pval); |
1da177e4 | 77 | |
3d824a46 DM |
78 | /* Skip over the NULL byte too. */ |
79 | pval += n + 1; | |
80 | len -= n + 1; | |
1da177e4 | 81 | |
3d824a46 DM |
82 | if (len > 0) |
83 | seq_printf(f, " + "); | |
1da177e4 | 84 | } |
3d824a46 DM |
85 | } else { |
86 | if (len & 3) { | |
87 | while (len) { | |
88 | len--; | |
89 | if (len) | |
90 | seq_printf(f, "%02x.", | |
91 | *(unsigned char *) pval); | |
92 | else | |
93 | seq_printf(f, "%02x", | |
94 | *(unsigned char *) pval); | |
95 | pval++; | |
1da177e4 LT |
96 | } |
97 | } else { | |
3d824a46 DM |
98 | while (len >= 4) { |
99 | len -= 4; | |
100 | ||
101 | if (len) | |
102 | seq_printf(f, "%08x.", | |
103 | *(unsigned int *) pval); | |
104 | else | |
105 | seq_printf(f, "%08x", | |
106 | *(unsigned int *) pval); | |
107 | pval += 4; | |
1da177e4 | 108 | } |
1da177e4 LT |
109 | } |
110 | } | |
3d824a46 DM |
111 | seq_printf(f, "\n"); |
112 | ||
113 | return 0; | |
1da177e4 LT |
114 | } |
115 | ||
3d824a46 | 116 | static void *property_start(struct seq_file *f, loff_t *pos) |
1da177e4 | 117 | { |
3d824a46 DM |
118 | if (*pos == 0) |
119 | return pos; | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | static void *property_next(struct seq_file *f, void *v, loff_t *pos) | |
124 | { | |
125 | (*pos)++; | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | static void property_stop(struct seq_file *f, void *v) | |
130 | { | |
131 | /* Nothing to do */ | |
132 | } | |
133 | ||
134 | static struct seq_operations property_op = { | |
135 | .start = property_start, | |
136 | .next = property_next, | |
137 | .stop = property_stop, | |
138 | .show = property_show | |
139 | }; | |
140 | ||
141 | static int property_open(struct inode *inode, struct file *file) | |
142 | { | |
143 | struct op_inode_info *oi = OP_I(inode); | |
144 | int ret; | |
145 | ||
146 | BUG_ON(oi->type != op_inode_prop); | |
147 | ||
148 | ret = seq_open(file, &property_op); | |
149 | if (!ret) { | |
150 | struct seq_file *m = file->private_data; | |
151 | m->private = oi->u.prop; | |
1da177e4 | 152 | } |
3d824a46 | 153 | return ret; |
1da177e4 LT |
154 | } |
155 | ||
4b6f5d20 | 156 | static const struct file_operations openpromfs_prop_ops = { |
3d824a46 DM |
157 | .open = property_open, |
158 | .read = seq_read, | |
159 | .llseek = seq_lseek, | |
160 | .release = seq_release, | |
1da177e4 LT |
161 | }; |
162 | ||
3d824a46 | 163 | static int openpromfs_readdir(struct file *, void *, filldir_t); |
1da177e4 | 164 | |
4b6f5d20 | 165 | static const struct file_operations openprom_operations = { |
1da177e4 LT |
166 | .read = generic_read_dir, |
167 | .readdir = openpromfs_readdir, | |
168 | }; | |
169 | ||
3d824a46 | 170 | static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
1da177e4 LT |
171 | |
172 | static struct inode_operations openprom_inode_operations = { | |
173 | .lookup = openpromfs_lookup, | |
174 | }; | |
175 | ||
3d824a46 | 176 | static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 177 | { |
3d824a46 DM |
178 | struct op_inode_info *ent_oi, *oi = OP_I(dir); |
179 | struct device_node *dp, *child; | |
180 | struct property *prop; | |
181 | enum op_inode_type ent_type; | |
182 | union op_inode_data ent_data; | |
1da177e4 | 183 | const char *name; |
1da177e4 | 184 | struct inode *inode; |
3d824a46 DM |
185 | unsigned int ino; |
186 | int len; | |
1da177e4 | 187 | |
3d824a46 DM |
188 | BUG_ON(oi->type != op_inode_node); |
189 | ||
190 | dp = oi->u.node; | |
191 | ||
1da177e4 LT |
192 | name = dentry->d_name.name; |
193 | len = dentry->d_name.len; | |
3d824a46 DM |
194 | |
195 | mutex_lock(&op_mutex); | |
196 | ||
197 | child = dp->child; | |
198 | while (child) { | |
199 | int n = strlen(child->path_component_name); | |
200 | ||
201 | if (len == n && | |
202 | !strncmp(child->path_component_name, name, len)) { | |
203 | ent_type = op_inode_node; | |
204 | ent_data.node = child; | |
205 | ino = child->unique_id; | |
206 | goto found; | |
1da177e4 | 207 | } |
3d824a46 | 208 | child = child->sibling; |
1da177e4 | 209 | } |
3d824a46 DM |
210 | |
211 | prop = dp->properties; | |
212 | while (prop) { | |
213 | int n = strlen(prop->name); | |
214 | ||
215 | if (len == n && !strncmp(prop->name, name, len)) { | |
216 | ent_type = op_inode_prop; | |
217 | ent_data.prop = prop; | |
218 | ino = prop->unique_id; | |
219 | goto found; | |
1da177e4 | 220 | } |
3d824a46 DM |
221 | |
222 | prop = prop->next; | |
1da177e4 | 223 | } |
3d824a46 DM |
224 | |
225 | mutex_unlock(&op_mutex); | |
226 | return ERR_PTR(-ENOENT); | |
227 | ||
228 | found: | |
229 | inode = iget(dir->i_sb, ino); | |
230 | mutex_unlock(&op_mutex); | |
1da177e4 LT |
231 | if (!inode) |
232 | return ERR_PTR(-EINVAL); | |
3d824a46 DM |
233 | ent_oi = OP_I(inode); |
234 | ent_oi->type = ent_type; | |
235 | ent_oi->u = ent_data; | |
236 | ||
237 | switch (ent_type) { | |
238 | case op_inode_node: | |
1da177e4 | 239 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; |
3d824a46 | 240 | inode->i_op = &openprom_inode_operations; |
1da177e4 LT |
241 | inode->i_fop = &openprom_operations; |
242 | inode->i_nlink = 2; | |
243 | break; | |
3d824a46 DM |
244 | case op_inode_prop: |
245 | if (!strcmp(dp->name, "options") && (len == 17) && | |
246 | !strncmp (name, "security-password", 17)) | |
1da177e4 | 247 | inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR; |
3d824a46 | 248 | else |
1da177e4 | 249 | inode->i_mode = S_IFREG | S_IRUGO; |
1da177e4 LT |
250 | inode->i_fop = &openpromfs_prop_ops; |
251 | inode->i_nlink = 1; | |
3d824a46 | 252 | inode->i_size = ent_oi->u.prop->length; |
1da177e4 LT |
253 | break; |
254 | } | |
255 | ||
256 | inode->i_gid = 0; | |
257 | inode->i_uid = 0; | |
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_dentry->d_inode; | |
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; | |
1da177e4 | 270 | unsigned int ino; |
3d824a46 DM |
271 | int i; |
272 | ||
273 | mutex_lock(&op_mutex); | |
1da177e4 LT |
274 | |
275 | ino = inode->i_ino; | |
276 | i = filp->f_pos; | |
277 | switch (i) { | |
278 | case 0: | |
3d824a46 DM |
279 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
280 | goto out; | |
1da177e4 LT |
281 | i++; |
282 | filp->f_pos++; | |
283 | /* fall thru */ | |
284 | case 1: | |
3d824a46 DM |
285 | if (filldir(dirent, "..", 2, i, |
286 | (dp->parent == NULL ? | |
287 | OPENPROM_ROOT_INO : | |
288 | dp->parent->unique_id), DT_DIR) < 0) | |
1da177e4 LT |
289 | goto out; |
290 | i++; | |
291 | filp->f_pos++; | |
292 | /* fall thru */ | |
293 | default: | |
294 | i -= 2; | |
3d824a46 DM |
295 | |
296 | /* First, the children nodes as directories. */ | |
297 | child = dp->child; | |
298 | while (i && child) { | |
299 | child = child->sibling; | |
1da177e4 LT |
300 | i--; |
301 | } | |
3d824a46 DM |
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) | |
1da177e4 | 307 | goto out; |
3d824a46 | 308 | |
1da177e4 | 309 | filp->f_pos++; |
3d824a46 | 310 | child = child->sibling; |
1da177e4 | 311 | } |
3d824a46 DM |
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) | |
1da177e4 | 322 | goto out; |
3d824a46 | 323 | |
1da177e4 | 324 | filp->f_pos++; |
3d824a46 | 325 | prop = prop->next; |
1da177e4 LT |
326 | } |
327 | } | |
328 | out: | |
3d824a46 | 329 | mutex_unlock(&op_mutex); |
1da177e4 LT |
330 | return 0; |
331 | } | |
332 | ||
3d824a46 | 333 | static kmem_cache_t *op_inode_cachep; |
1da177e4 | 334 | |
3d824a46 | 335 | static struct inode *openprom_alloc_inode(struct super_block *sb) |
1da177e4 | 336 | { |
3d824a46 | 337 | struct op_inode_info *oi; |
1da177e4 | 338 | |
e94b1766 | 339 | oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL); |
3d824a46 DM |
340 | if (!oi) |
341 | return NULL; | |
1da177e4 | 342 | |
3d824a46 | 343 | return &oi->vfs_inode; |
1da177e4 LT |
344 | } |
345 | ||
3d824a46 | 346 | static void openprom_destroy_inode(struct inode *inode) |
1da177e4 | 347 | { |
3d824a46 | 348 | kmem_cache_free(op_inode_cachep, OP_I(inode)); |
1da177e4 LT |
349 | } |
350 | ||
351 | static void openprom_read_inode(struct inode * inode) | |
352 | { | |
353 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
354 | if (inode->i_ino == OPENPROM_ROOT_INO) { | |
355 | inode->i_op = &openprom_inode_operations; | |
356 | inode->i_fop = &openprom_operations; | |
357 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
358 | } | |
359 | } | |
360 | ||
361 | static int openprom_remount(struct super_block *sb, int *flags, char *data) | |
362 | { | |
363 | *flags |= MS_NOATIME; | |
364 | return 0; | |
365 | } | |
366 | ||
367 | static struct super_operations openprom_sops = { | |
3d824a46 DM |
368 | .alloc_inode = openprom_alloc_inode, |
369 | .destroy_inode = openprom_destroy_inode, | |
1da177e4 LT |
370 | .read_inode = openprom_read_inode, |
371 | .statfs = simple_statfs, | |
372 | .remount_fs = openprom_remount, | |
373 | }; | |
374 | ||
375 | static int openprom_fill_super(struct super_block *s, void *data, int silent) | |
376 | { | |
3d824a46 DM |
377 | struct inode *root_inode; |
378 | struct op_inode_info *oi; | |
1da177e4 LT |
379 | |
380 | s->s_flags |= MS_NOATIME; | |
381 | s->s_blocksize = 1024; | |
382 | s->s_blocksize_bits = 10; | |
383 | s->s_magic = OPENPROM_SUPER_MAGIC; | |
384 | s->s_op = &openprom_sops; | |
385 | s->s_time_gran = 1; | |
386 | root_inode = iget(s, OPENPROM_ROOT_INO); | |
387 | if (!root_inode) | |
388 | goto out_no_root; | |
3d824a46 DM |
389 | |
390 | oi = OP_I(root_inode); | |
391 | oi->type = op_inode_node; | |
392 | oi->u.node = of_find_node_by_path("/"); | |
393 | ||
1da177e4 LT |
394 | s->s_root = d_alloc_root(root_inode); |
395 | if (!s->s_root) | |
396 | goto out_no_root; | |
397 | return 0; | |
398 | ||
399 | out_no_root: | |
400 | printk("openprom_fill_super: get root inode failed\n"); | |
401 | iput(root_inode); | |
402 | return -ENOMEM; | |
403 | } | |
404 | ||
454e2398 DH |
405 | static int openprom_get_sb(struct file_system_type *fs_type, |
406 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 407 | { |
454e2398 | 408 | return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt); |
1da177e4 LT |
409 | } |
410 | ||
411 | static struct file_system_type openprom_fs_type = { | |
412 | .owner = THIS_MODULE, | |
413 | .name = "openpromfs", | |
414 | .get_sb = openprom_get_sb, | |
415 | .kill_sb = kill_anon_super, | |
416 | }; | |
417 | ||
3d824a46 DM |
418 | static void op_inode_init_once(void *data, kmem_cache_t * cachep, unsigned long flags) |
419 | { | |
420 | struct op_inode_info *oi = (struct op_inode_info *) data; | |
421 | ||
422 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
423 | SLAB_CTOR_CONSTRUCTOR) | |
424 | inode_init_once(&oi->vfs_inode); | |
425 | } | |
426 | ||
1da177e4 LT |
427 | static int __init init_openprom_fs(void) |
428 | { | |
3d824a46 DM |
429 | int err; |
430 | ||
431 | op_inode_cachep = kmem_cache_create("op_inode_cache", | |
432 | sizeof(struct op_inode_info), | |
433 | 0, | |
434 | (SLAB_RECLAIM_ACCOUNT | | |
435 | SLAB_MEM_SPREAD), | |
436 | op_inode_init_once, NULL); | |
437 | if (!op_inode_cachep) | |
438 | return -ENOMEM; | |
439 | ||
440 | err = register_filesystem(&openprom_fs_type); | |
441 | if (err) | |
442 | kmem_cache_destroy(op_inode_cachep); | |
443 | ||
444 | return err; | |
1da177e4 LT |
445 | } |
446 | ||
447 | static void __exit exit_openprom_fs(void) | |
448 | { | |
1da177e4 | 449 | unregister_filesystem(&openprom_fs_type); |
3d824a46 | 450 | kmem_cache_destroy(op_inode_cachep); |
1da177e4 LT |
451 | } |
452 | ||
453 | module_init(init_openprom_fs) | |
454 | module_exit(exit_openprom_fs) | |
455 | MODULE_LICENSE("GPL"); |