blob: d17b4fd204e1f434558fdc55e78f6be0002a576e [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,
170};
171
David S. Miller3d824a42006-06-25 23:19:14 -0700172static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800174static const struct inode_operations openprom_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 .lookup = openpromfs_lookup,
176};
177
David S. Miller3d824a42006-06-25 23:19:14 -0700178static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
David S. Miller3d824a42006-06-25 23:19:14 -0700180 struct op_inode_info *ent_oi, *oi = OP_I(dir);
181 struct device_node *dp, *child;
182 struct property *prop;
183 enum op_inode_type ent_type;
184 union op_inode_data ent_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 struct inode *inode;
David S. Miller3d824a42006-06-25 23:19:14 -0700187 unsigned int ino;
188 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
David S. Miller3d824a42006-06-25 23:19:14 -0700190 BUG_ON(oi->type != op_inode_node);
191
192 dp = oi->u.node;
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 name = dentry->d_name.name;
195 len = dentry->d_name.len;
David S. Miller3d824a42006-06-25 23:19:14 -0700196
197 mutex_lock(&op_mutex);
198
199 child = dp->child;
200 while (child) {
201 int n = strlen(child->path_component_name);
202
203 if (len == n &&
204 !strncmp(child->path_component_name, name, len)) {
205 ent_type = op_inode_node;
206 ent_data.node = child;
207 ino = child->unique_id;
208 goto found;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 }
David S. Miller3d824a42006-06-25 23:19:14 -0700210 child = child->sibling;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
David S. Miller3d824a42006-06-25 23:19:14 -0700212
213 prop = dp->properties;
214 while (prop) {
215 int n = strlen(prop->name);
216
217 if (len == n && !strncmp(prop->name, name, len)) {
218 ent_type = op_inode_prop;
219 ent_data.prop = prop;
220 ino = prop->unique_id;
221 goto found;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 }
David S. Miller3d824a42006-06-25 23:19:14 -0700223
224 prop = prop->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
David S. Miller3d824a42006-06-25 23:19:14 -0700226
227 mutex_unlock(&op_mutex);
228 return ERR_PTR(-ENOENT);
229
230found:
David Howellsb88a27e2008-02-07 00:15:49 -0800231 inode = openprom_iget(dir->i_sb, ino);
David S. Miller3d824a42006-06-25 23:19:14 -0700232 mutex_unlock(&op_mutex);
David Howellsb88a27e2008-02-07 00:15:49 -0800233 if (IS_ERR(inode))
234 return ERR_CAST(inode);
David S. Miller3d824a42006-06-25 23:19:14 -0700235 ent_oi = OP_I(inode);
236 ent_oi->type = ent_type;
237 ent_oi->u = ent_data;
238
239 switch (ent_type) {
240 case op_inode_node:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
David S. Miller3d824a42006-06-25 23:19:14 -0700242 inode->i_op = &openprom_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 inode->i_fop = &openprom_operations;
244 inode->i_nlink = 2;
245 break;
David S. Miller3d824a42006-06-25 23:19:14 -0700246 case op_inode_prop:
247 if (!strcmp(dp->name, "options") && (len == 17) &&
248 !strncmp (name, "security-password", 17))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
David S. Miller3d824a42006-06-25 23:19:14 -0700250 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 inode->i_mode = S_IFREG | S_IRUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 inode->i_fop = &openpromfs_prop_ops;
253 inode->i_nlink = 1;
David S. Miller3d824a42006-06-25 23:19:14 -0700254 inode->i_size = ent_oi->u.prop->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 break;
256 }
257
258 inode->i_gid = 0;
259 inode->i_uid = 0;
260
261 d_add(dentry, inode);
262 return NULL;
263}
264
265static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
266{
Josef Sipek80a06782006-12-08 02:37:26 -0800267 struct inode *inode = filp->f_path.dentry->d_inode;
David S. Miller3d824a42006-06-25 23:19:14 -0700268 struct op_inode_info *oi = OP_I(inode);
269 struct device_node *dp = oi->u.node;
270 struct device_node *child;
271 struct property *prop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 unsigned int ino;
David S. Miller3d824a42006-06-25 23:19:14 -0700273 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
David S. Miller3d824a42006-06-25 23:19:14 -0700275 mutex_lock(&op_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 ino = inode->i_ino;
278 i = filp->f_pos;
279 switch (i) {
280 case 0:
David S. Miller3d824a42006-06-25 23:19:14 -0700281 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
282 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 i++;
284 filp->f_pos++;
285 /* fall thru */
286 case 1:
David S. Miller3d824a42006-06-25 23:19:14 -0700287 if (filldir(dirent, "..", 2, i,
288 (dp->parent == NULL ?
289 OPENPROM_ROOT_INO :
290 dp->parent->unique_id), DT_DIR) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 goto out;
292 i++;
293 filp->f_pos++;
294 /* fall thru */
295 default:
296 i -= 2;
David S. Miller3d824a42006-06-25 23:19:14 -0700297
298 /* First, the children nodes as directories. */
299 child = dp->child;
300 while (i && child) {
301 child = child->sibling;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 i--;
303 }
David S. Miller3d824a42006-06-25 23:19:14 -0700304 while (child) {
305 if (filldir(dirent,
306 child->path_component_name,
307 strlen(child->path_component_name),
308 filp->f_pos, child->unique_id, DT_DIR) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 goto out;
David S. Miller3d824a42006-06-25 23:19:14 -0700310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 filp->f_pos++;
David S. Miller3d824a42006-06-25 23:19:14 -0700312 child = child->sibling;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 }
David S. Miller3d824a42006-06-25 23:19:14 -0700314
315 /* Next, the properties as files. */
316 prop = dp->properties;
317 while (i && prop) {
318 prop = prop->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 i--;
David S. Miller3d824a42006-06-25 23:19:14 -0700320 }
321 while (prop) {
322 if (filldir(dirent, prop->name, strlen(prop->name),
323 filp->f_pos, prop->unique_id, DT_REG) < 0)
324 goto out;
325
326 filp->f_pos++;
327 prop = prop->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 }
329 }
330out:
David S. Miller3d824a42006-06-25 23:19:14 -0700331 mutex_unlock(&op_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return 0;
333}
334
Christoph Lametere18b8902006-12-06 20:33:20 -0800335static struct kmem_cache *op_inode_cachep;
David S. Miller3d824a42006-06-25 23:19:14 -0700336
337static struct inode *openprom_alloc_inode(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
David S. Miller3d824a42006-06-25 23:19:14 -0700339 struct op_inode_info *oi;
340
Christoph Lametere94b1762006-12-06 20:33:17 -0800341 oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL);
David S. Miller3d824a42006-06-25 23:19:14 -0700342 if (!oi)
343 return NULL;
344
345 return &oi->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}
347
David S. Miller3d824a42006-06-25 23:19:14 -0700348static void openprom_destroy_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
David S. Miller3d824a42006-06-25 23:19:14 -0700350 kmem_cache_free(op_inode_cachep, OP_I(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
David Howellsb88a27e2008-02-07 00:15:49 -0800353static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
David Howellsb88a27e2008-02-07 00:15:49 -0800355 struct inode *inode;
356
357 inode = iget_locked(sb, ino);
358 if (!inode)
359 return ERR_PTR(-ENOMEM);
360 if (inode->i_state & I_NEW) {
361 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
362 if (inode->i_ino == OPENPROM_ROOT_INO) {
363 inode->i_op = &openprom_inode_operations;
364 inode->i_fop = &openprom_operations;
365 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
366 }
367 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
David Howellsb88a27e2008-02-07 00:15:49 -0800369 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
372static int openprom_remount(struct super_block *sb, int *flags, char *data)
373{
374 *flags |= MS_NOATIME;
375 return 0;
376}
377
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800378static const struct super_operations openprom_sops = {
David S. Miller3d824a42006-06-25 23:19:14 -0700379 .alloc_inode = openprom_alloc_inode,
380 .destroy_inode = openprom_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 .statfs = simple_statfs,
382 .remount_fs = openprom_remount,
383};
384
385static int openprom_fill_super(struct super_block *s, void *data, int silent)
386{
David S. Miller3d824a42006-06-25 23:19:14 -0700387 struct inode *root_inode;
388 struct op_inode_info *oi;
David Howellsb88a27e2008-02-07 00:15:49 -0800389 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 s->s_flags |= MS_NOATIME;
392 s->s_blocksize = 1024;
393 s->s_blocksize_bits = 10;
394 s->s_magic = OPENPROM_SUPER_MAGIC;
395 s->s_op = &openprom_sops;
396 s->s_time_gran = 1;
David Howellsb88a27e2008-02-07 00:15:49 -0800397 root_inode = openprom_iget(s, OPENPROM_ROOT_INO);
398 if (IS_ERR(root_inode)) {
399 ret = PTR_ERR(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 goto out_no_root;
David Howellsb88a27e2008-02-07 00:15:49 -0800401 }
David S. Miller3d824a42006-06-25 23:19:14 -0700402
403 oi = OP_I(root_inode);
404 oi->type = op_inode_node;
405 oi->u.node = of_find_node_by_path("/");
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 s->s_root = d_alloc_root(root_inode);
408 if (!s->s_root)
David Howellsb88a27e2008-02-07 00:15:49 -0800409 goto out_no_root_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 return 0;
411
David Howellsb88a27e2008-02-07 00:15:49 -0800412out_no_root_dentry:
413 iput(root_inode);
414 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415out_no_root:
416 printk("openprom_fill_super: get root inode failed\n");
David Howellsb88a27e2008-02-07 00:15:49 -0800417 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
David Howells454e2392006-06-23 02:02:57 -0700420static int openprom_get_sb(struct file_system_type *fs_type,
421 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
David Howells454e2392006-06-23 02:02:57 -0700423 return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
425
426static struct file_system_type openprom_fs_type = {
427 .owner = THIS_MODULE,
428 .name = "openpromfs",
429 .get_sb = openprom_get_sb,
430 .kill_sb = kill_anon_super,
431};
432
Christoph Lameter4ba9b9d2007-10-16 23:25:51 -0700433static void op_inode_init_once(struct kmem_cache * cachep, void *data)
David S. Miller3d824a42006-06-25 23:19:14 -0700434{
435 struct op_inode_info *oi = (struct op_inode_info *) data;
436
Christoph Lametera35afb82007-05-16 22:10:57 -0700437 inode_init_once(&oi->vfs_inode);
David S. Miller3d824a42006-06-25 23:19:14 -0700438}
439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440static int __init init_openprom_fs(void)
441{
David S. Miller3d824a42006-06-25 23:19:14 -0700442 int err;
443
444 op_inode_cachep = kmem_cache_create("op_inode_cache",
445 sizeof(struct op_inode_info),
446 0,
447 (SLAB_RECLAIM_ACCOUNT |
448 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900449 op_inode_init_once);
David S. Miller3d824a42006-06-25 23:19:14 -0700450 if (!op_inode_cachep)
451 return -ENOMEM;
452
453 err = register_filesystem(&openprom_fs_type);
454 if (err)
455 kmem_cache_destroy(op_inode_cachep);
456
457 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
460static void __exit exit_openprom_fs(void)
461{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 unregister_filesystem(&openprom_fs_type);
David S. Miller3d824a42006-06-25 23:19:14 -0700463 kmem_cache_destroy(op_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
466module_init(init_openprom_fs)
467module_exit(exit_openprom_fs)
468MODULE_LICENSE("GPL");