blob: a2a5bff774e3355a6de04af0e028dcb563dc87be [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 Howellsb88a27e2008-02-07 00:15:49 -080041static struct inode *openprom_iget(struct super_block *sb, ino_t ino);
42
David S. Miller3d824a42006-06-25 23:19:14 -070043static inline struct op_inode_info *OP_I(struct inode *inode)
Jan Engelhardta04ee142006-06-25 05:47:36 -070044{
David S. Miller3d824a42006-06-25 23:19:14 -070045 return container_of(inode, struct op_inode_info, vfs_inode);
Jan Engelhardta04ee142006-06-25 05:47:36 -070046}
47
David S. Miller3d824a42006-06-25 23:19:14 -070048static int is_string(unsigned char *p, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
David S. Miller3d824a42006-06-25 23:19:14 -070050 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 return 0;
David S. Miller3d824a42006-06-25 23:19:14 -070060 }
61
62 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063}
64
David S. Miller3d824a42006-06-25 23:19:14 -070065static int property_show(struct seq_file *f, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
David S. Miller3d824a42006-06-25 23:19:14 -070067 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, " + ");
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 } else {
David S. Miller3d824a42006-06-25 23:19:14 -070088 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++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 }
99 } else {
David S. Miller3d824a42006-06-25 23:19:14 -0700100 while (len >= 4) {
101 len -= 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
David S. Miller3d824a42006-06-25 23:19:14 -0700103 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 }
David S. Miller3d824a42006-06-25 23:19:14 -0700113 seq_printf(f, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return 0;
116}
117
David S. Miller3d824a42006-06-25 23:19:14 -0700118static void *property_start(struct seq_file *f, loff_t *pos)
119{
120 if (*pos == 0)
121 return pos;
122 return NULL;
123}
124
125static void *property_next(struct seq_file *f, void *v, loff_t *pos)
126{
127 (*pos)++;
128 return NULL;
129}
130
131static void property_stop(struct seq_file *f, void *v)
132{
133 /* Nothing to do */
134}
135
Jan Engelhardt872e2be2008-01-22 18:29:20 -0800136static const struct seq_operations property_op = {
David S. Miller3d824a42006-06-25 23:19:14 -0700137 .start = property_start,
138 .next = property_next,
139 .stop = property_stop,
140 .show = property_show
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141};
142
David S. Miller3d824a42006-06-25 23:19:14 -0700143static 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
158static const struct file_operations openpromfs_prop_ops = {
159 .open = property_open,
160 .read = seq_read,
161 .llseek = seq_lseek,
162 .release = seq_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163};
164
David S. Miller3d824a42006-06-25 23:19:14 -0700165static int openpromfs_readdir(struct file *, void *, filldir_t);
166
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800167static const struct file_operations openprom_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 .read = generic_read_dir,
169 .readdir = openpromfs_readdir,
Christoph Hellwig3222a3e2008-09-03 21:53:01 +0200170 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171};
172
David S. Miller3d824a42006-06-25 23:19:14 -0700173static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800175static const struct inode_operations openprom_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 .lookup = openpromfs_lookup,
177};
178
David S. Miller3d824a42006-06-25 23:19:14 -0700179static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
David S. Miller3d824a42006-06-25 23:19:14 -0700181 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 struct inode *inode;
David S. Miller3d824a42006-06-25 23:19:14 -0700188 unsigned int ino;
189 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
David S. Miller3d824a42006-06-25 23:19:14 -0700191 BUG_ON(oi->type != op_inode_node);
192
193 dp = oi->u.node;
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 name = dentry->d_name.name;
196 len = dentry->d_name.len;
David S. Miller3d824a42006-06-25 23:19:14 -0700197
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
David S. Miller3d824a42006-06-25 23:19:14 -0700211 child = child->sibling;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
David S. Miller3d824a42006-06-25 23:19:14 -0700213
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 }
David S. Miller3d824a42006-06-25 23:19:14 -0700224
225 prop = prop->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
David S. Miller3d824a42006-06-25 23:19:14 -0700227
228 mutex_unlock(&op_mutex);
229 return ERR_PTR(-ENOENT);
230
231found:
David Howellsb88a27e2008-02-07 00:15:49 -0800232 inode = openprom_iget(dir->i_sb, ino);
David S. Miller3d824a42006-06-25 23:19:14 -0700233 mutex_unlock(&op_mutex);
David Howellsb88a27e2008-02-07 00:15:49 -0800234 if (IS_ERR(inode))
235 return ERR_CAST(inode);
David S. Miller3d824a42006-06-25 23:19:14 -0700236 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:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
David S. Miller3d824a42006-06-25 23:19:14 -0700243 inode->i_op = &openprom_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 inode->i_fop = &openprom_operations;
245 inode->i_nlink = 2;
246 break;
David S. Miller3d824a42006-06-25 23:19:14 -0700247 case op_inode_prop:
248 if (!strcmp(dp->name, "options") && (len == 17) &&
249 !strncmp (name, "security-password", 17))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
David S. Miller3d824a42006-06-25 23:19:14 -0700251 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 inode->i_mode = S_IFREG | S_IRUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 inode->i_fop = &openpromfs_prop_ops;
254 inode->i_nlink = 1;
David S. Miller3d824a42006-06-25 23:19:14 -0700255 inode->i_size = ent_oi->u.prop->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 break;
257 }
258
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 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
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100346static void openprom_i_callback(struct rcu_head *head)
347{
348 struct inode *inode = container_of(head, struct inode, i_rcu);
349 INIT_LIST_HEAD(&inode->i_dentry);
350 kmem_cache_free(op_inode_cachep, OP_I(inode));
351}
352
David S. Miller3d824a42006-06-25 23:19:14 -0700353static void openprom_destroy_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100355 call_rcu(&inode->i_rcu, openprom_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356}
357
David Howellsb88a27e2008-02-07 00:15:49 -0800358static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
David Howellsb88a27e2008-02-07 00:15:49 -0800360 struct inode *inode;
361
362 inode = iget_locked(sb, ino);
363 if (!inode)
364 return ERR_PTR(-ENOMEM);
365 if (inode->i_state & I_NEW) {
366 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
367 if (inode->i_ino == OPENPROM_ROOT_INO) {
368 inode->i_op = &openprom_inode_operations;
369 inode->i_fop = &openprom_operations;
370 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
371 }
372 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
David Howellsb88a27e2008-02-07 00:15:49 -0800374 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
376
377static int openprom_remount(struct super_block *sb, int *flags, char *data)
378{
379 *flags |= MS_NOATIME;
380 return 0;
381}
382
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800383static const struct super_operations openprom_sops = {
David S. Miller3d824a42006-06-25 23:19:14 -0700384 .alloc_inode = openprom_alloc_inode,
385 .destroy_inode = openprom_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 .statfs = simple_statfs,
387 .remount_fs = openprom_remount,
388};
389
390static int openprom_fill_super(struct super_block *s, void *data, int silent)
391{
David S. Miller3d824a42006-06-25 23:19:14 -0700392 struct inode *root_inode;
393 struct op_inode_info *oi;
David Howellsb88a27e2008-02-07 00:15:49 -0800394 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 s->s_flags |= MS_NOATIME;
397 s->s_blocksize = 1024;
398 s->s_blocksize_bits = 10;
399 s->s_magic = OPENPROM_SUPER_MAGIC;
400 s->s_op = &openprom_sops;
401 s->s_time_gran = 1;
David Howellsb88a27e2008-02-07 00:15:49 -0800402 root_inode = openprom_iget(s, OPENPROM_ROOT_INO);
403 if (IS_ERR(root_inode)) {
404 ret = PTR_ERR(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 goto out_no_root;
David Howellsb88a27e2008-02-07 00:15:49 -0800406 }
David S. Miller3d824a42006-06-25 23:19:14 -0700407
408 oi = OP_I(root_inode);
409 oi->type = op_inode_node;
410 oi->u.node = of_find_node_by_path("/");
411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 s->s_root = d_alloc_root(root_inode);
413 if (!s->s_root)
David Howellsb88a27e2008-02-07 00:15:49 -0800414 goto out_no_root_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return 0;
416
David Howellsb88a27e2008-02-07 00:15:49 -0800417out_no_root_dentry:
418 iput(root_inode);
419 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420out_no_root:
421 printk("openprom_fill_super: get root inode failed\n");
David Howellsb88a27e2008-02-07 00:15:49 -0800422 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423}
424
Al Virofc14f2f2010-07-25 01:48:30 +0400425static struct dentry *openprom_mount(struct file_system_type *fs_type,
426 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
Meelis Roos0e154822010-11-08 13:38:14 -0800428 return mount_single(fs_type, flags, data, openprom_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429}
430
431static struct file_system_type openprom_fs_type = {
432 .owner = THIS_MODULE,
433 .name = "openpromfs",
Al Virofc14f2f2010-07-25 01:48:30 +0400434 .mount = openprom_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 .kill_sb = kill_anon_super,
436};
437
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700438static void op_inode_init_once(void *data)
David S. Miller3d824a42006-06-25 23:19:14 -0700439{
440 struct op_inode_info *oi = (struct op_inode_info *) data;
441
Christoph Lametera35afb82007-05-16 22:10:57 -0700442 inode_init_once(&oi->vfs_inode);
David S. Miller3d824a42006-06-25 23:19:14 -0700443}
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445static int __init init_openprom_fs(void)
446{
David S. Miller3d824a42006-06-25 23:19:14 -0700447 int err;
448
449 op_inode_cachep = kmem_cache_create("op_inode_cache",
450 sizeof(struct op_inode_info),
451 0,
452 (SLAB_RECLAIM_ACCOUNT |
453 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900454 op_inode_init_once);
David S. Miller3d824a42006-06-25 23:19:14 -0700455 if (!op_inode_cachep)
456 return -ENOMEM;
457
458 err = register_filesystem(&openprom_fs_type);
459 if (err)
460 kmem_cache_destroy(op_inode_cachep);
461
462 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463}
464
465static void __exit exit_openprom_fs(void)
466{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 unregister_filesystem(&openprom_fs_type);
David S. Miller3d824a42006-06-25 23:19:14 -0700468 kmem_cache_destroy(op_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470
471module_init(init_openprom_fs)
472module_exit(exit_openprom_fs)
473MODULE_LICENSE("GPL");