blob: e62397341c363fa31bbc656cd59120320786a55d [file] [log] [blame]
David S. Miller3d824a42006-06-25 23:19:14 -07001/* inode.c: /proc/openprom handling routines
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
12#include <linux/slab.h>
David S. Miller3d824a42006-06-25 23:19:14 -070013#include <linux/seq_file.h>
Jeff Garzike18fa702006-09-24 11:13:19 -040014#include <linux/magic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include <asm/openprom.h>
17#include <asm/oplib.h>
David S. Miller3d824a42006-06-25 23:19:14 -070018#include <asm/prom.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/uaccess.h>
20
David S. Miller3d824a42006-06-25 23:19:14 -070021static DEFINE_MUTEX(op_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
David S. Miller3d824a42006-06-25 23:19:14 -070023#define OPENPROM_ROOT_INO 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
David S. Miller3d824a42006-06-25 23:19:14 -070025enum op_inode_type {
26 op_inode_node,
27 op_inode_prop,
28};
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
David S. Miller3d824a42006-06-25 23:19:14 -070030union op_inode_data {
31 struct device_node *node;
32 struct property *prop;
33};
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
David S. Miller3d824a42006-06-25 23:19:14 -070035struct op_inode_info {
36 struct inode vfs_inode;
37 enum op_inode_type type;
38 union op_inode_data u;
39};
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
David S. Miller3d824a42006-06-25 23:19:14 -070041static inline struct op_inode_info *OP_I(struct inode *inode)
Jan Engelhardta04ee142006-06-25 05:47:36 -070042{
David S. Miller3d824a42006-06-25 23:19:14 -070043 return container_of(inode, struct op_inode_info, vfs_inode);
Jan Engelhardta04ee142006-06-25 05:47:36 -070044}
45
David S. Miller3d824a42006-06-25 23:19:14 -070046static int is_string(unsigned char *p, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
David S. Miller3d824a42006-06-25 23:19:14 -070048 int i;
49
50 for (i = 0; i < len; i++) {
51 unsigned char val = p[i];
52
53 if ((i && !val) ||
54 (val >= ' ' && val <= '~'))
55 continue;
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return 0;
David S. Miller3d824a42006-06-25 23:19:14 -070058 }
59
60 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061}
62
David S. Miller3d824a42006-06-25 23:19:14 -070063static int property_show(struct seq_file *f, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
David S. Miller3d824a42006-06-25 23:19:14 -070065 struct property *prop = f->private;
66 void *pval;
67 int len;
68
69 len = prop->length;
70 pval = prop->value;
71
72 if (is_string(pval, len)) {
73 while (len > 0) {
74 int n = strlen(pval);
75
76 seq_printf(f, "%s", (char *) pval);
77
78 /* Skip over the NULL byte too. */
79 pval += n + 1;
80 len -= n + 1;
81
82 if (len > 0)
83 seq_printf(f, " + ");
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 } else {
David S. Miller3d824a42006-06-25 23:19:14 -070086 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++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 }
97 } else {
David S. Miller3d824a42006-06-25 23:19:14 -070098 while (len >= 4) {
99 len -= 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
David S. Miller3d824a42006-06-25 23:19:14 -0700101 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 }
109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
David S. Miller3d824a42006-06-25 23:19:14 -0700111 seq_printf(f, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return 0;
114}
115
David S. Miller3d824a42006-06-25 23:19:14 -0700116static void *property_start(struct seq_file *f, loff_t *pos)
117{
118 if (*pos == 0)
119 return pos;
120 return NULL;
121}
122
123static void *property_next(struct seq_file *f, void *v, loff_t *pos)
124{
125 (*pos)++;
126 return NULL;
127}
128
129static void property_stop(struct seq_file *f, void *v)
130{
131 /* Nothing to do */
132}
133
134static struct seq_operations property_op = {
135 .start = property_start,
136 .next = property_next,
137 .stop = property_stop,
138 .show = property_show
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139};
140
David S. Miller3d824a42006-06-25 23:19:14 -0700141static 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;
152 }
153 return ret;
154}
155
156static const struct file_operations openpromfs_prop_ops = {
157 .open = property_open,
158 .read = seq_read,
159 .llseek = seq_lseek,
160 .release = seq_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161};
162
David S. Miller3d824a42006-06-25 23:19:14 -0700163static int openpromfs_readdir(struct file *, void *, filldir_t);
164
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800165static const struct file_operations openprom_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 .read = generic_read_dir,
167 .readdir = openpromfs_readdir,
168};
169
David S. Miller3d824a42006-06-25 23:19:14 -0700170static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800172static const struct inode_operations openprom_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 .lookup = openpromfs_lookup,
174};
175
David S. Miller3d824a42006-06-25 23:19:14 -0700176static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
David S. Miller3d824a42006-06-25 23:19:14 -0700178 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 struct inode *inode;
David S. Miller3d824a42006-06-25 23:19:14 -0700185 unsigned int ino;
186 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
David S. Miller3d824a42006-06-25 23:19:14 -0700188 BUG_ON(oi->type != op_inode_node);
189
190 dp = oi->u.node;
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 name = dentry->d_name.name;
193 len = dentry->d_name.len;
David S. Miller3d824a42006-06-25 23:19:14 -0700194
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 }
David S. Miller3d824a42006-06-25 23:19:14 -0700208 child = child->sibling;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 }
David S. Miller3d824a42006-06-25 23:19:14 -0700210
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 }
David S. Miller3d824a42006-06-25 23:19:14 -0700221
222 prop = prop->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 }
David S. Miller3d824a42006-06-25 23:19:14 -0700224
225 mutex_unlock(&op_mutex);
226 return ERR_PTR(-ENOENT);
227
228found:
229 inode = iget(dir->i_sb, ino);
230 mutex_unlock(&op_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 if (!inode)
232 return ERR_PTR(-EINVAL);
David S. Miller3d824a42006-06-25 23:19:14 -0700233 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:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
David S. Miller3d824a42006-06-25 23:19:14 -0700240 inode->i_op = &openprom_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 inode->i_fop = &openprom_operations;
242 inode->i_nlink = 2;
243 break;
David S. Miller3d824a42006-06-25 23:19:14 -0700244 case op_inode_prop:
245 if (!strcmp(dp->name, "options") && (len == 17) &&
246 !strncmp (name, "security-password", 17))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
David S. Miller3d824a42006-06-25 23:19:14 -0700248 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 inode->i_mode = S_IFREG | S_IRUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 inode->i_fop = &openpromfs_prop_ops;
251 inode->i_nlink = 1;
David S. Miller3d824a42006-06-25 23:19:14 -0700252 inode->i_size = ent_oi->u.prop->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 break;
254 }
255
256 inode->i_gid = 0;
257 inode->i_uid = 0;
258
259 d_add(dentry, inode);
260 return NULL;
261}
262
263static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
264{
Josef Sipek80a06782006-12-08 02:37:26 -0800265 struct inode *inode = filp->f_path.dentry->d_inode;
David S. Miller3d824a42006-06-25 23:19:14 -0700266 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 unsigned int ino;
David S. Miller3d824a42006-06-25 23:19:14 -0700271 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
David S. Miller3d824a42006-06-25 23:19:14 -0700273 mutex_lock(&op_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275 ino = inode->i_ino;
276 i = filp->f_pos;
277 switch (i) {
278 case 0:
David S. Miller3d824a42006-06-25 23:19:14 -0700279 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
280 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 i++;
282 filp->f_pos++;
283 /* fall thru */
284 case 1:
David S. Miller3d824a42006-06-25 23:19:14 -0700285 if (filldir(dirent, "..", 2, i,
286 (dp->parent == NULL ?
287 OPENPROM_ROOT_INO :
288 dp->parent->unique_id), DT_DIR) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 goto out;
290 i++;
291 filp->f_pos++;
292 /* fall thru */
293 default:
294 i -= 2;
David S. Miller3d824a42006-06-25 23:19:14 -0700295
296 /* First, the children nodes as directories. */
297 child = dp->child;
298 while (i && child) {
299 child = child->sibling;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 i--;
301 }
David S. Miller3d824a42006-06-25 23:19:14 -0700302 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 goto out;
David S. Miller3d824a42006-06-25 23:19:14 -0700308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 filp->f_pos++;
David S. Miller3d824a42006-06-25 23:19:14 -0700310 child = child->sibling;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
David S. Miller3d824a42006-06-25 23:19:14 -0700312
313 /* Next, the properties as files. */
314 prop = dp->properties;
315 while (i && prop) {
316 prop = prop->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 i--;
David S. Miller3d824a42006-06-25 23:19:14 -0700318 }
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327 }
328out:
David S. Miller3d824a42006-06-25 23:19:14 -0700329 mutex_unlock(&op_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 return 0;
331}
332
Christoph Lametere18b8902006-12-06 20:33:20 -0800333static struct kmem_cache *op_inode_cachep;
David S. Miller3d824a42006-06-25 23:19:14 -0700334
335static struct inode *openprom_alloc_inode(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
David S. Miller3d824a42006-06-25 23:19:14 -0700337 struct op_inode_info *oi;
338
Christoph Lametere94b1762006-12-06 20:33:17 -0800339 oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL);
David S. Miller3d824a42006-06-25 23:19:14 -0700340 if (!oi)
341 return NULL;
342
343 return &oi->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
David S. Miller3d824a42006-06-25 23:19:14 -0700346static void openprom_destroy_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
David S. Miller3d824a42006-06-25 23:19:14 -0700348 kmem_cache_free(op_inode_cachep, OP_I(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350
351static 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
361static int openprom_remount(struct super_block *sb, int *flags, char *data)
362{
363 *flags |= MS_NOATIME;
364 return 0;
365}
366
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800367static const struct super_operations openprom_sops = {
David S. Miller3d824a42006-06-25 23:19:14 -0700368 .alloc_inode = openprom_alloc_inode,
369 .destroy_inode = openprom_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 .read_inode = openprom_read_inode,
371 .statfs = simple_statfs,
372 .remount_fs = openprom_remount,
373};
374
375static int openprom_fill_super(struct super_block *s, void *data, int silent)
376{
David S. Miller3d824a42006-06-25 23:19:14 -0700377 struct inode *root_inode;
378 struct op_inode_info *oi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
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;
David S. Miller3d824a42006-06-25 23:19:14 -0700389
390 oi = OP_I(root_inode);
391 oi->type = op_inode_node;
392 oi->u.node = of_find_node_by_path("/");
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 s->s_root = d_alloc_root(root_inode);
395 if (!s->s_root)
396 goto out_no_root;
397 return 0;
398
399out_no_root:
400 printk("openprom_fill_super: get root inode failed\n");
401 iput(root_inode);
402 return -ENOMEM;
403}
404
David Howells454e2392006-06-23 02:02:57 -0700405static int openprom_get_sb(struct file_system_type *fs_type,
406 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407{
David Howells454e2392006-06-23 02:02:57 -0700408 return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
411static 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
Christoph Lametere18b8902006-12-06 20:33:20 -0800418static void op_inode_init_once(void *data, struct kmem_cache * cachep, unsigned long flags)
David S. Miller3d824a42006-06-25 23:19:14 -0700419{
420 struct op_inode_info *oi = (struct op_inode_info *) data;
421
Christoph Lametera35afb82007-05-16 22:10:57 -0700422 inode_init_once(&oi->vfs_inode);
David S. Miller3d824a42006-06-25 23:19:14 -0700423}
424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425static int __init init_openprom_fs(void)
426{
David S. Miller3d824a42006-06-25 23:19:14 -0700427 int err;
428
429 op_inode_cachep = kmem_cache_create("op_inode_cache",
430 sizeof(struct op_inode_info),
431 0,
432 (SLAB_RECLAIM_ACCOUNT |
433 SLAB_MEM_SPREAD),
434 op_inode_init_once, NULL);
435 if (!op_inode_cachep)
436 return -ENOMEM;
437
438 err = register_filesystem(&openprom_fs_type);
439 if (err)
440 kmem_cache_destroy(op_inode_cachep);
441
442 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
444
445static void __exit exit_openprom_fs(void)
446{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 unregister_filesystem(&openprom_fs_type);
David S. Miller3d824a42006-06-25 23:19:14 -0700448 kmem_cache_destroy(op_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
450
451module_init(init_openprom_fs)
452module_exit(exit_openprom_fs)
453MODULE_LICENSE("GPL");