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1da177e4 LT |
1 | /*****************************************************************************/ |
2 | ||
3 | /* | |
4 | * inode.c -- Inode/Dentry functions for the USB device file system. | |
5 | * | |
6 | * Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch) | |
7 | * Copyright (C) 2001,2002,2004 Greg Kroah-Hartman (greg@kroah.com) | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
23 | * History: | |
24 | * 0.1 04.01.2000 Created | |
25 | * 0.2 10.12.2001 converted to use the vfs layer better | |
26 | */ | |
27 | ||
28 | /*****************************************************************************/ | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/fs.h> | |
32 | #include <linux/mount.h> | |
33 | #include <linux/pagemap.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/proc_fs.h> | |
36 | #include <linux/usb.h> | |
37 | #include <linux/namei.h> | |
38 | #include <linux/usbdevice_fs.h> | |
39 | #include <linux/smp_lock.h> | |
40 | #include <linux/parser.h> | |
54a5c4cd | 41 | #include <linux/notifier.h> |
1da177e4 LT |
42 | #include <asm/byteorder.h> |
43 | #include "usb.h" | |
6d5e8254 | 44 | #include "hcd.h" |
1da177e4 LT |
45 | |
46 | static struct super_operations usbfs_ops; | |
066202dd | 47 | static const struct file_operations default_file_operations; |
1da177e4 LT |
48 | static struct vfsmount *usbfs_mount; |
49 | static int usbfs_mount_count; /* = 0 */ | |
50 | static int ignore_mount = 0; | |
51 | ||
52 | static struct dentry *devices_usbfs_dentry; | |
53 | static int num_buses; /* = 0 */ | |
54 | ||
55 | static uid_t devuid; /* = 0 */ | |
56 | static uid_t busuid; /* = 0 */ | |
57 | static uid_t listuid; /* = 0 */ | |
58 | static gid_t devgid; /* = 0 */ | |
59 | static gid_t busgid; /* = 0 */ | |
60 | static gid_t listgid; /* = 0 */ | |
61 | static umode_t devmode = S_IWUSR | S_IRUGO; | |
62 | static umode_t busmode = S_IXUGO | S_IRUGO; | |
63 | static umode_t listmode = S_IRUGO; | |
64 | ||
65 | enum { | |
66 | Opt_devuid, Opt_devgid, Opt_devmode, | |
67 | Opt_busuid, Opt_busgid, Opt_busmode, | |
68 | Opt_listuid, Opt_listgid, Opt_listmode, | |
69 | Opt_err, | |
70 | }; | |
71 | ||
72 | static match_table_t tokens = { | |
73 | {Opt_devuid, "devuid=%u"}, | |
74 | {Opt_devgid, "devgid=%u"}, | |
75 | {Opt_devmode, "devmode=%o"}, | |
76 | {Opt_busuid, "busuid=%u"}, | |
77 | {Opt_busgid, "busgid=%u"}, | |
78 | {Opt_busmode, "busmode=%o"}, | |
79 | {Opt_listuid, "listuid=%u"}, | |
80 | {Opt_listgid, "listgid=%u"}, | |
81 | {Opt_listmode, "listmode=%o"}, | |
82 | {Opt_err, NULL} | |
83 | }; | |
84 | ||
85 | static int parse_options(struct super_block *s, char *data) | |
86 | { | |
87 | char *p; | |
88 | int option; | |
89 | ||
90 | /* (re)set to defaults. */ | |
91 | devuid = 0; | |
92 | busuid = 0; | |
93 | listuid = 0; | |
94 | devgid = 0; | |
95 | busgid = 0; | |
96 | listgid = 0; | |
97 | devmode = S_IWUSR | S_IRUGO; | |
98 | busmode = S_IXUGO | S_IRUGO; | |
99 | listmode = S_IRUGO; | |
100 | ||
101 | while ((p = strsep(&data, ",")) != NULL) { | |
102 | substring_t args[MAX_OPT_ARGS]; | |
103 | int token; | |
104 | if (!*p) | |
105 | continue; | |
106 | ||
107 | token = match_token(p, tokens, args); | |
108 | switch (token) { | |
109 | case Opt_devuid: | |
110 | if (match_int(&args[0], &option)) | |
111 | return -EINVAL; | |
112 | devuid = option; | |
113 | break; | |
114 | case Opt_devgid: | |
115 | if (match_int(&args[0], &option)) | |
116 | return -EINVAL; | |
117 | devgid = option; | |
118 | break; | |
119 | case Opt_devmode: | |
120 | if (match_octal(&args[0], &option)) | |
121 | return -EINVAL; | |
122 | devmode = option & S_IRWXUGO; | |
123 | break; | |
124 | case Opt_busuid: | |
125 | if (match_int(&args[0], &option)) | |
126 | return -EINVAL; | |
127 | busuid = option; | |
128 | break; | |
129 | case Opt_busgid: | |
130 | if (match_int(&args[0], &option)) | |
131 | return -EINVAL; | |
132 | busgid = option; | |
133 | break; | |
134 | case Opt_busmode: | |
135 | if (match_octal(&args[0], &option)) | |
136 | return -EINVAL; | |
137 | busmode = option & S_IRWXUGO; | |
138 | break; | |
139 | case Opt_listuid: | |
140 | if (match_int(&args[0], &option)) | |
141 | return -EINVAL; | |
142 | listuid = option; | |
143 | break; | |
144 | case Opt_listgid: | |
145 | if (match_int(&args[0], &option)) | |
146 | return -EINVAL; | |
147 | listgid = option; | |
148 | break; | |
149 | case Opt_listmode: | |
150 | if (match_octal(&args[0], &option)) | |
151 | return -EINVAL; | |
152 | listmode = option & S_IRWXUGO; | |
153 | break; | |
154 | default: | |
155 | err("usbfs: unrecognised mount option \"%s\" " | |
156 | "or missing value\n", p); | |
157 | return -EINVAL; | |
158 | } | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static void update_special(struct dentry *special) | |
165 | { | |
166 | special->d_inode->i_uid = listuid; | |
167 | special->d_inode->i_gid = listgid; | |
168 | special->d_inode->i_mode = S_IFREG | listmode; | |
169 | } | |
170 | ||
171 | static void update_dev(struct dentry *dev) | |
172 | { | |
173 | dev->d_inode->i_uid = devuid; | |
174 | dev->d_inode->i_gid = devgid; | |
175 | dev->d_inode->i_mode = S_IFREG | devmode; | |
176 | } | |
177 | ||
178 | static void update_bus(struct dentry *bus) | |
179 | { | |
180 | struct dentry *dev = NULL; | |
181 | ||
182 | bus->d_inode->i_uid = busuid; | |
183 | bus->d_inode->i_gid = busgid; | |
184 | bus->d_inode->i_mode = S_IFDIR | busmode; | |
185 | ||
1b1dcc1b | 186 | mutex_lock(&bus->d_inode->i_mutex); |
1da177e4 | 187 | |
5160ee6f | 188 | list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child) |
1da177e4 LT |
189 | if (dev->d_inode) |
190 | update_dev(dev); | |
191 | ||
1b1dcc1b | 192 | mutex_unlock(&bus->d_inode->i_mutex); |
1da177e4 LT |
193 | } |
194 | ||
195 | static void update_sb(struct super_block *sb) | |
196 | { | |
197 | struct dentry *root = sb->s_root; | |
198 | struct dentry *bus = NULL; | |
199 | ||
200 | if (!root) | |
201 | return; | |
202 | ||
f2eace23 | 203 | mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT); |
1da177e4 | 204 | |
5160ee6f | 205 | list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) { |
1da177e4 LT |
206 | if (bus->d_inode) { |
207 | switch (S_IFMT & bus->d_inode->i_mode) { | |
208 | case S_IFDIR: | |
209 | update_bus(bus); | |
210 | break; | |
211 | case S_IFREG: | |
212 | update_special(bus); | |
213 | break; | |
214 | default: | |
215 | warn("Unknown node %s mode %x found on remount!\n",bus->d_name.name,bus->d_inode->i_mode); | |
216 | break; | |
217 | } | |
218 | } | |
219 | } | |
220 | ||
1b1dcc1b | 221 | mutex_unlock(&root->d_inode->i_mutex); |
1da177e4 LT |
222 | } |
223 | ||
224 | static int remount(struct super_block *sb, int *flags, char *data) | |
225 | { | |
226 | /* If this is not a real mount, | |
227 | * i.e. it's a simple_pin_fs from create_special_files, | |
228 | * then ignore it. | |
229 | */ | |
230 | if (ignore_mount) | |
231 | return 0; | |
232 | ||
233 | if (parse_options(sb, data)) { | |
234 | warn("usbfs: mount parameter error:"); | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
238 | if (usbfs_mount && usbfs_mount->mnt_sb) | |
239 | update_sb(usbfs_mount->mnt_sb); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev) | |
245 | { | |
246 | struct inode *inode = new_inode(sb); | |
247 | ||
248 | if (inode) { | |
249 | inode->i_mode = mode; | |
250 | inode->i_uid = current->fsuid; | |
251 | inode->i_gid = current->fsgid; | |
1da177e4 LT |
252 | inode->i_blocks = 0; |
253 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
254 | switch (mode & S_IFMT) { | |
255 | default: | |
256 | init_special_inode(inode, mode, dev); | |
257 | break; | |
258 | case S_IFREG: | |
259 | inode->i_fop = &default_file_operations; | |
260 | break; | |
261 | case S_IFDIR: | |
bc7cb323 | 262 | inode->i_op = &simple_dir_inode_operations; |
1da177e4 LT |
263 | inode->i_fop = &simple_dir_operations; |
264 | ||
265 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
266 | inode->i_nlink++; | |
267 | break; | |
268 | } | |
269 | } | |
270 | return inode; | |
271 | } | |
272 | ||
273 | /* SMP-safe */ | |
274 | static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode, | |
275 | dev_t dev) | |
276 | { | |
277 | struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev); | |
278 | int error = -EPERM; | |
279 | ||
280 | if (dentry->d_inode) | |
281 | return -EEXIST; | |
282 | ||
283 | if (inode) { | |
284 | d_instantiate(dentry, inode); | |
285 | dget(dentry); | |
286 | error = 0; | |
287 | } | |
288 | return error; | |
289 | } | |
290 | ||
291 | static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode) | |
292 | { | |
293 | int res; | |
294 | ||
295 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
296 | res = usbfs_mknod (dir, dentry, mode, 0); | |
297 | if (!res) | |
298 | dir->i_nlink++; | |
299 | return res; | |
300 | } | |
301 | ||
302 | static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode) | |
303 | { | |
304 | mode = (mode & S_IALLUGO) | S_IFREG; | |
305 | return usbfs_mknod (dir, dentry, mode, 0); | |
306 | } | |
307 | ||
308 | static inline int usbfs_positive (struct dentry *dentry) | |
309 | { | |
310 | return dentry->d_inode && !d_unhashed(dentry); | |
311 | } | |
312 | ||
313 | static int usbfs_empty (struct dentry *dentry) | |
314 | { | |
315 | struct list_head *list; | |
316 | ||
317 | spin_lock(&dcache_lock); | |
318 | ||
319 | list_for_each(list, &dentry->d_subdirs) { | |
5160ee6f | 320 | struct dentry *de = list_entry(list, struct dentry, d_u.d_child); |
1da177e4 LT |
321 | if (usbfs_positive(de)) { |
322 | spin_unlock(&dcache_lock); | |
323 | return 0; | |
324 | } | |
325 | } | |
326 | ||
327 | spin_unlock(&dcache_lock); | |
328 | return 1; | |
329 | } | |
330 | ||
331 | static int usbfs_unlink (struct inode *dir, struct dentry *dentry) | |
332 | { | |
333 | struct inode *inode = dentry->d_inode; | |
1b1dcc1b | 334 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
335 | dentry->d_inode->i_nlink--; |
336 | dput(dentry); | |
1b1dcc1b | 337 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
338 | d_delete(dentry); |
339 | return 0; | |
340 | } | |
341 | ||
342 | static int usbfs_rmdir(struct inode *dir, struct dentry *dentry) | |
343 | { | |
344 | int error = -ENOTEMPTY; | |
345 | struct inode * inode = dentry->d_inode; | |
346 | ||
1b1dcc1b | 347 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
348 | dentry_unhash(dentry); |
349 | if (usbfs_empty(dentry)) { | |
350 | dentry->d_inode->i_nlink -= 2; | |
351 | dput(dentry); | |
352 | inode->i_flags |= S_DEAD; | |
353 | dir->i_nlink--; | |
354 | error = 0; | |
355 | } | |
1b1dcc1b | 356 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
357 | if (!error) |
358 | d_delete(dentry); | |
359 | dput(dentry); | |
360 | return error; | |
361 | } | |
362 | ||
363 | ||
364 | /* default file operations */ | |
365 | static ssize_t default_read_file (struct file *file, char __user *buf, | |
366 | size_t count, loff_t *ppos) | |
367 | { | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static ssize_t default_write_file (struct file *file, const char __user *buf, | |
372 | size_t count, loff_t *ppos) | |
373 | { | |
374 | return count; | |
375 | } | |
376 | ||
377 | static loff_t default_file_lseek (struct file *file, loff_t offset, int orig) | |
378 | { | |
379 | loff_t retval = -EINVAL; | |
380 | ||
1b1dcc1b | 381 | mutex_lock(&file->f_dentry->d_inode->i_mutex); |
1da177e4 LT |
382 | switch(orig) { |
383 | case 0: | |
384 | if (offset > 0) { | |
385 | file->f_pos = offset; | |
386 | retval = file->f_pos; | |
387 | } | |
388 | break; | |
389 | case 1: | |
390 | if ((offset + file->f_pos) > 0) { | |
391 | file->f_pos += offset; | |
392 | retval = file->f_pos; | |
393 | } | |
394 | break; | |
395 | default: | |
396 | break; | |
397 | } | |
1b1dcc1b | 398 | mutex_unlock(&file->f_dentry->d_inode->i_mutex); |
1da177e4 LT |
399 | return retval; |
400 | } | |
401 | ||
402 | static int default_open (struct inode *inode, struct file *file) | |
403 | { | |
8e18e294 TT |
404 | if (inode->i_private) |
405 | file->private_data = inode->i_private; | |
1da177e4 LT |
406 | |
407 | return 0; | |
408 | } | |
409 | ||
066202dd | 410 | static const struct file_operations default_file_operations = { |
1da177e4 LT |
411 | .read = default_read_file, |
412 | .write = default_write_file, | |
413 | .open = default_open, | |
414 | .llseek = default_file_lseek, | |
415 | }; | |
416 | ||
1da177e4 LT |
417 | static struct super_operations usbfs_ops = { |
418 | .statfs = simple_statfs, | |
419 | .drop_inode = generic_delete_inode, | |
420 | .remount_fs = remount, | |
421 | }; | |
422 | ||
423 | static int usbfs_fill_super(struct super_block *sb, void *data, int silent) | |
424 | { | |
425 | struct inode *inode; | |
426 | struct dentry *root; | |
427 | ||
428 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
429 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
430 | sb->s_magic = USBDEVICE_SUPER_MAGIC; | |
431 | sb->s_op = &usbfs_ops; | |
432 | sb->s_time_gran = 1; | |
433 | inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0); | |
434 | ||
435 | if (!inode) { | |
436 | dbg("%s: could not get inode!",__FUNCTION__); | |
437 | return -ENOMEM; | |
438 | } | |
439 | ||
440 | root = d_alloc_root(inode); | |
441 | if (!root) { | |
442 | dbg("%s: could not get root dentry!",__FUNCTION__); | |
443 | iput(inode); | |
444 | return -ENOMEM; | |
445 | } | |
446 | sb->s_root = root; | |
447 | return 0; | |
448 | } | |
449 | ||
1da177e4 LT |
450 | /* |
451 | * fs_create_by_name - create a file, given a name | |
452 | * @name: name of file | |
453 | * @mode: type of file | |
454 | * @parent: dentry of directory to create it in | |
455 | * @dentry: resulting dentry of file | |
456 | * | |
457 | * This function handles both regular files and directories. | |
458 | */ | |
459 | static int fs_create_by_name (const char *name, mode_t mode, | |
460 | struct dentry *parent, struct dentry **dentry) | |
461 | { | |
462 | int error = 0; | |
463 | ||
464 | /* If the parent is not specified, we create it in the root. | |
465 | * We need the root dentry to do this, which is in the super | |
466 | * block. A pointer to that is in the struct vfsmount that we | |
467 | * have around. | |
468 | */ | |
469 | if (!parent ) { | |
470 | if (usbfs_mount && usbfs_mount->mnt_sb) { | |
471 | parent = usbfs_mount->mnt_sb->s_root; | |
472 | } | |
473 | } | |
474 | ||
475 | if (!parent) { | |
476 | dbg("Ah! can not find a parent!"); | |
477 | return -EFAULT; | |
478 | } | |
479 | ||
480 | *dentry = NULL; | |
1b1dcc1b | 481 | mutex_lock(&parent->d_inode->i_mutex); |
5f45f1a7 | 482 | *dentry = lookup_one_len(name, parent, strlen(name)); |
1da177e4 LT |
483 | if (!IS_ERR(dentry)) { |
484 | if ((mode & S_IFMT) == S_IFDIR) | |
485 | error = usbfs_mkdir (parent->d_inode, *dentry, mode); | |
486 | else | |
487 | error = usbfs_create (parent->d_inode, *dentry, mode); | |
488 | } else | |
489 | error = PTR_ERR(dentry); | |
1b1dcc1b | 490 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
491 | |
492 | return error; | |
493 | } | |
494 | ||
495 | static struct dentry *fs_create_file (const char *name, mode_t mode, | |
496 | struct dentry *parent, void *data, | |
066202dd | 497 | const struct file_operations *fops, |
1da177e4 LT |
498 | uid_t uid, gid_t gid) |
499 | { | |
500 | struct dentry *dentry; | |
501 | int error; | |
502 | ||
503 | dbg("creating file '%s'",name); | |
504 | ||
505 | error = fs_create_by_name (name, mode, parent, &dentry); | |
506 | if (error) { | |
507 | dentry = NULL; | |
508 | } else { | |
509 | if (dentry->d_inode) { | |
510 | if (data) | |
8e18e294 | 511 | dentry->d_inode->i_private = data; |
1da177e4 LT |
512 | if (fops) |
513 | dentry->d_inode->i_fop = fops; | |
514 | dentry->d_inode->i_uid = uid; | |
515 | dentry->d_inode->i_gid = gid; | |
516 | } | |
517 | } | |
518 | ||
519 | return dentry; | |
520 | } | |
521 | ||
522 | static void fs_remove_file (struct dentry *dentry) | |
523 | { | |
524 | struct dentry *parent = dentry->d_parent; | |
525 | ||
526 | if (!parent || !parent->d_inode) | |
527 | return; | |
528 | ||
8e7795ef | 529 | mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT); |
1da177e4 LT |
530 | if (usbfs_positive(dentry)) { |
531 | if (dentry->d_inode) { | |
532 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
533 | usbfs_rmdir(parent->d_inode, dentry); | |
534 | else | |
535 | usbfs_unlink(parent->d_inode, dentry); | |
536 | dput(dentry); | |
537 | } | |
538 | } | |
1b1dcc1b | 539 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
540 | } |
541 | ||
542 | /* --------------------------------------------------------------------- */ | |
543 | ||
454e2398 DH |
544 | static int usb_get_sb(struct file_system_type *fs_type, |
545 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 546 | { |
454e2398 | 547 | return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt); |
1da177e4 LT |
548 | } |
549 | ||
550 | static struct file_system_type usb_fs_type = { | |
551 | .owner = THIS_MODULE, | |
552 | .name = "usbfs", | |
553 | .get_sb = usb_get_sb, | |
554 | .kill_sb = kill_litter_super, | |
555 | }; | |
556 | ||
557 | /* --------------------------------------------------------------------- */ | |
558 | ||
559 | static int create_special_files (void) | |
560 | { | |
561 | struct dentry *parent; | |
562 | int retval; | |
563 | ||
564 | /* the simple_pin_fs calls will call remount with no options | |
565 | * without this flag that would overwrite the real mount options (if any) | |
566 | */ | |
567 | ignore_mount = 1; | |
568 | ||
569 | /* create the devices special file */ | |
1f5ce9e9 | 570 | retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count); |
1da177e4 LT |
571 | if (retval) { |
572 | err ("Unable to get usbfs mount"); | |
573 | goto exit; | |
574 | } | |
575 | ||
576 | ignore_mount = 0; | |
577 | ||
578 | parent = usbfs_mount->mnt_sb->s_root; | |
579 | devices_usbfs_dentry = fs_create_file ("devices", | |
580 | listmode | S_IFREG, parent, | |
581 | NULL, &usbfs_devices_fops, | |
582 | listuid, listgid); | |
583 | if (devices_usbfs_dentry == NULL) { | |
584 | err ("Unable to create devices usbfs file"); | |
585 | retval = -ENODEV; | |
586 | goto error_clean_mounts; | |
587 | } | |
588 | ||
589 | goto exit; | |
590 | ||
591 | error_clean_mounts: | |
592 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
593 | exit: | |
594 | return retval; | |
595 | } | |
596 | ||
597 | static void remove_special_files (void) | |
598 | { | |
599 | if (devices_usbfs_dentry) | |
600 | fs_remove_file (devices_usbfs_dentry); | |
601 | devices_usbfs_dentry = NULL; | |
602 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
603 | } | |
604 | ||
605 | void usbfs_update_special (void) | |
606 | { | |
607 | struct inode *inode; | |
608 | ||
609 | if (devices_usbfs_dentry) { | |
610 | inode = devices_usbfs_dentry->d_inode; | |
611 | if (inode) | |
612 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
613 | } | |
614 | } | |
615 | ||
54a5c4cd | 616 | static void usbfs_add_bus(struct usb_bus *bus) |
1da177e4 LT |
617 | { |
618 | struct dentry *parent; | |
619 | char name[8]; | |
620 | int retval; | |
621 | ||
622 | /* create the special files if this is the first bus added */ | |
623 | if (num_buses == 0) { | |
624 | retval = create_special_files(); | |
625 | if (retval) | |
626 | return; | |
627 | } | |
628 | ++num_buses; | |
629 | ||
630 | sprintf (name, "%03d", bus->busnum); | |
631 | ||
632 | parent = usbfs_mount->mnt_sb->s_root; | |
633 | bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent, | |
634 | bus, NULL, busuid, busgid); | |
635 | if (bus->usbfs_dentry == NULL) { | |
636 | err ("error creating usbfs bus entry"); | |
637 | return; | |
638 | } | |
1da177e4 LT |
639 | } |
640 | ||
54a5c4cd | 641 | static void usbfs_remove_bus(struct usb_bus *bus) |
1da177e4 LT |
642 | { |
643 | if (bus->usbfs_dentry) { | |
644 | fs_remove_file (bus->usbfs_dentry); | |
645 | bus->usbfs_dentry = NULL; | |
646 | } | |
647 | ||
648 | --num_buses; | |
649 | if (num_buses <= 0) { | |
650 | remove_special_files(); | |
651 | num_buses = 0; | |
652 | } | |
1da177e4 LT |
653 | } |
654 | ||
54a5c4cd | 655 | static void usbfs_add_device(struct usb_device *dev) |
1da177e4 LT |
656 | { |
657 | char name[8]; | |
658 | int i; | |
659 | int i_size; | |
660 | ||
661 | sprintf (name, "%03d", dev->devnum); | |
662 | dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG, | |
663 | dev->bus->usbfs_dentry, dev, | |
664 | &usbfs_device_file_operations, | |
665 | devuid, devgid); | |
666 | if (dev->usbfs_dentry == NULL) { | |
667 | err ("error creating usbfs device entry"); | |
668 | return; | |
669 | } | |
670 | ||
671 | /* Set the size of the device's file to be | |
672 | * equal to the size of the device descriptors. */ | |
673 | i_size = sizeof (struct usb_device_descriptor); | |
674 | for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) { | |
675 | struct usb_config_descriptor *config = | |
676 | (struct usb_config_descriptor *)dev->rawdescriptors[i]; | |
677 | i_size += le16_to_cpu(config->wTotalLength); | |
678 | } | |
679 | if (dev->usbfs_dentry->d_inode) | |
680 | dev->usbfs_dentry->d_inode->i_size = i_size; | |
1da177e4 LT |
681 | } |
682 | ||
54a5c4cd | 683 | static void usbfs_remove_device(struct usb_device *dev) |
1da177e4 LT |
684 | { |
685 | struct dev_state *ds; | |
686 | struct siginfo sinfo; | |
687 | ||
688 | if (dev->usbfs_dentry) { | |
689 | fs_remove_file (dev->usbfs_dentry); | |
690 | dev->usbfs_dentry = NULL; | |
691 | } | |
692 | while (!list_empty(&dev->filelist)) { | |
693 | ds = list_entry(dev->filelist.next, struct dev_state, list); | |
694 | wake_up_all(&ds->wait); | |
695 | list_del_init(&ds->list); | |
696 | if (ds->discsignr) { | |
58a5b0a6 | 697 | sinfo.si_signo = ds->discsignr; |
1da177e4 LT |
698 | sinfo.si_errno = EPIPE; |
699 | sinfo.si_code = SI_ASYNCIO; | |
700 | sinfo.si_addr = ds->disccontext; | |
7a01955f | 701 | kill_proc_info_as_uid(ds->discsignr, &sinfo, ds->disc_pid, ds->disc_uid, ds->disc_euid, ds->secid); |
1da177e4 LT |
702 | } |
703 | } | |
54a5c4cd GKH |
704 | } |
705 | ||
706 | static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev) | |
707 | { | |
708 | switch (action) { | |
709 | case USB_DEVICE_ADD: | |
710 | usbfs_add_device(dev); | |
711 | break; | |
712 | case USB_DEVICE_REMOVE: | |
713 | usbfs_remove_device(dev); | |
714 | break; | |
715 | case USB_BUS_ADD: | |
716 | usbfs_add_bus(dev); | |
717 | break; | |
718 | case USB_BUS_REMOVE: | |
719 | usbfs_remove_bus(dev); | |
720 | } | |
721 | ||
1da177e4 LT |
722 | usbfs_update_special(); |
723 | usbfs_conn_disc_event(); | |
54a5c4cd | 724 | return NOTIFY_OK; |
1da177e4 LT |
725 | } |
726 | ||
54a5c4cd GKH |
727 | static struct notifier_block usbfs_nb = { |
728 | .notifier_call = usbfs_notify, | |
729 | }; | |
730 | ||
1da177e4 LT |
731 | /* --------------------------------------------------------------------- */ |
732 | ||
733 | static struct proc_dir_entry *usbdir = NULL; | |
734 | ||
735 | int __init usbfs_init(void) | |
736 | { | |
737 | int retval; | |
738 | ||
1da177e4 | 739 | retval = register_filesystem(&usb_fs_type); |
fbf82fd2 | 740 | if (retval) |
1da177e4 | 741 | return retval; |
1da177e4 | 742 | |
54a5c4cd GKH |
743 | usb_register_notify(&usbfs_nb); |
744 | ||
1da177e4 LT |
745 | /* create mount point for usbfs */ |
746 | usbdir = proc_mkdir("usb", proc_bus); | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
751 | void usbfs_cleanup(void) | |
752 | { | |
54a5c4cd | 753 | usb_unregister_notify(&usbfs_nb); |
1da177e4 LT |
754 | unregister_filesystem(&usb_fs_type); |
755 | if (usbdir) | |
756 | remove_proc_entry("usb", proc_bus); | |
757 | } | |
758 |