wusb: whci-hcd: always lock whc->lock with interrupts disabled
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / openpromfs / inode.c
blobffcd04f0012c6aa67dcf2fa5990d4d162f835f5a
1 /* inode.c: /proc/openprom handling routines
3 * Copyright (C) 1996-1999 Jakub Jelinek (jakub@redhat.com)
4 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
5 */
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>
16 #include <asm/openprom.h>
17 #include <asm/oplib.h>
18 #include <asm/prom.h>
19 #include <asm/uaccess.h>
21 static DEFINE_MUTEX(op_mutex);
23 #define OPENPROM_ROOT_INO 0
25 enum op_inode_type {
26 op_inode_node,
27 op_inode_prop,
30 union op_inode_data {
31 struct device_node *node;
32 struct property *prop;
35 struct op_inode_info {
36 struct inode vfs_inode;
37 enum op_inode_type type;
38 union op_inode_data u;
41 static struct inode *openprom_iget(struct super_block *sb, ino_t ino);
43 static inline struct op_inode_info *OP_I(struct inode *inode)
45 return container_of(inode, struct op_inode_info, vfs_inode);
48 static int is_string(unsigned char *p, int len)
50 int i;
52 for (i = 0; i < len; i++) {
53 unsigned char val = p[i];
55 if ((i && !val) ||
56 (val >= ' ' && val <= '~'))
57 continue;
59 return 0;
62 return 1;
65 static int property_show(struct seq_file *f, void *v)
67 struct property *prop = f->private;
68 void *pval;
69 int len;
71 len = prop->length;
72 pval = prop->value;
74 if (is_string(pval, len)) {
75 while (len > 0) {
76 int n = strlen(pval);
78 seq_printf(f, "%s", (char *) pval);
80 /* Skip over the NULL byte too. */
81 pval += n + 1;
82 len -= n + 1;
84 if (len > 0)
85 seq_printf(f, " + ");
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++;
99 } else {
100 while (len >= 4) {
101 len -= 4;
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;
113 seq_printf(f, "\n");
115 return 0;
118 static void *property_start(struct seq_file *f, loff_t *pos)
120 if (*pos == 0)
121 return pos;
122 return NULL;
125 static void *property_next(struct seq_file *f, void *v, loff_t *pos)
127 (*pos)++;
128 return NULL;
131 static void property_stop(struct seq_file *f, void *v)
133 /* Nothing to do */
136 static const struct seq_operations property_op = {
137 .start = property_start,
138 .next = property_next,
139 .stop = property_stop,
140 .show = property_show
143 static int property_open(struct inode *inode, struct file *file)
145 struct op_inode_info *oi = OP_I(inode);
146 int ret;
148 BUG_ON(oi->type != op_inode_prop);
150 ret = seq_open(file, &property_op);
151 if (!ret) {
152 struct seq_file *m = file->private_data;
153 m->private = oi->u.prop;
155 return ret;
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,
165 static int openpromfs_readdir(struct file *, void *, filldir_t);
167 static const struct file_operations openprom_operations = {
168 .read = generic_read_dir,
169 .readdir = openpromfs_readdir,
170 .llseek = generic_file_llseek,
173 static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *);
175 static const struct inode_operations openprom_inode_operations = {
176 .lookup = openpromfs_lookup,
179 static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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;
191 BUG_ON(oi->type != op_inode_node);
193 dp = oi->u.node;
195 name = dentry->d_name.name;
196 len = dentry->d_name.len;
198 mutex_lock(&op_mutex);
200 child = dp->child;
201 while (child) {
202 int n = strlen(child->path_component_name);
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;
211 child = child->sibling;
214 prop = dp->properties;
215 while (prop) {
216 int n = strlen(prop->name);
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;
225 prop = prop->next;
228 mutex_unlock(&op_mutex);
229 return ERR_PTR(-ENOENT);
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;
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;
259 d_add(dentry, inode);
260 return NULL;
263 static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
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;
273 mutex_lock(&op_mutex);
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;
296 /* First, the children nodes as directories. */
297 child = dp->child;
298 while (i && child) {
299 child = child->sibling;
300 i--;
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;
309 filp->f_pos++;
310 child = child->sibling;
313 /* Next, the properties as files. */
314 prop = dp->properties;
315 while (i && prop) {
316 prop = prop->next;
317 i--;
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;
324 filp->f_pos++;
325 prop = prop->next;
328 out:
329 mutex_unlock(&op_mutex);
330 return 0;
333 static struct kmem_cache *op_inode_cachep;
335 static struct inode *openprom_alloc_inode(struct super_block *sb)
337 struct op_inode_info *oi;
339 oi = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL);
340 if (!oi)
341 return NULL;
343 return &oi->vfs_inode;
346 static void openprom_destroy_inode(struct inode *inode)
348 kmem_cache_free(op_inode_cachep, OP_I(inode));
351 static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
353 struct inode *inode;
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;
365 unlock_new_inode(inode);
367 return inode;
370 static int openprom_remount(struct super_block *sb, int *flags, char *data)
372 *flags |= MS_NOATIME;
373 return 0;
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,
383 static int openprom_fill_super(struct super_block *s, void *data, int silent)
385 struct inode *root_inode;
386 struct op_inode_info *oi;
387 int ret;
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;
401 oi = OP_I(root_inode);
402 oi->type = op_inode_node;
403 oi->u.node = of_find_node_by_path("/");
405 s->s_root = d_alloc_root(root_inode);
406 if (!s->s_root)
407 goto out_no_root_dentry;
408 return 0;
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;
418 static int openprom_get_sb(struct file_system_type *fs_type,
419 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
421 return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt);
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,
431 static void op_inode_init_once(void *data)
433 struct op_inode_info *oi = (struct op_inode_info *) data;
435 inode_init_once(&oi->vfs_inode);
438 static int __init init_openprom_fs(void)
440 int err;
442 op_inode_cachep = kmem_cache_create("op_inode_cache",
443 sizeof(struct op_inode_info),
445 (SLAB_RECLAIM_ACCOUNT |
446 SLAB_MEM_SPREAD),
447 op_inode_init_once);
448 if (!op_inode_cachep)
449 return -ENOMEM;
451 err = register_filesystem(&openprom_fs_type);
452 if (err)
453 kmem_cache_destroy(op_inode_cachep);
455 return err;
458 static void __exit exit_openprom_fs(void)
460 unregister_filesystem(&openprom_fs_type);
461 kmem_cache_destroy(op_inode_cachep);
464 module_init(init_openprom_fs)
465 module_exit(exit_openprom_fs)
466 MODULE_LICENSE("GPL");