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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 | ||
30 | #include <linux/config.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/fs.h> | |
33 | #include <linux/mount.h> | |
34 | #include <linux/pagemap.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/proc_fs.h> | |
37 | #include <linux/usb.h> | |
38 | #include <linux/namei.h> | |
39 | #include <linux/usbdevice_fs.h> | |
40 | #include <linux/smp_lock.h> | |
41 | #include <linux/parser.h> | |
54a5c4cd | 42 | #include <linux/notifier.h> |
1da177e4 LT |
43 | #include <asm/byteorder.h> |
44 | #include "usb.h" | |
6d5e8254 | 45 | #include "hcd.h" |
1da177e4 LT |
46 | |
47 | static struct super_operations usbfs_ops; | |
48 | static struct file_operations default_file_operations; | |
1da177e4 LT |
49 | static struct vfsmount *usbfs_mount; |
50 | static int usbfs_mount_count; /* = 0 */ | |
51 | static int ignore_mount = 0; | |
52 | ||
53 | static struct dentry *devices_usbfs_dentry; | |
54 | static int num_buses; /* = 0 */ | |
55 | ||
56 | static uid_t devuid; /* = 0 */ | |
57 | static uid_t busuid; /* = 0 */ | |
58 | static uid_t listuid; /* = 0 */ | |
59 | static gid_t devgid; /* = 0 */ | |
60 | static gid_t busgid; /* = 0 */ | |
61 | static gid_t listgid; /* = 0 */ | |
62 | static umode_t devmode = S_IWUSR | S_IRUGO; | |
63 | static umode_t busmode = S_IXUGO | S_IRUGO; | |
64 | static umode_t listmode = S_IRUGO; | |
65 | ||
66 | enum { | |
67 | Opt_devuid, Opt_devgid, Opt_devmode, | |
68 | Opt_busuid, Opt_busgid, Opt_busmode, | |
69 | Opt_listuid, Opt_listgid, Opt_listmode, | |
70 | Opt_err, | |
71 | }; | |
72 | ||
73 | static match_table_t tokens = { | |
74 | {Opt_devuid, "devuid=%u"}, | |
75 | {Opt_devgid, "devgid=%u"}, | |
76 | {Opt_devmode, "devmode=%o"}, | |
77 | {Opt_busuid, "busuid=%u"}, | |
78 | {Opt_busgid, "busgid=%u"}, | |
79 | {Opt_busmode, "busmode=%o"}, | |
80 | {Opt_listuid, "listuid=%u"}, | |
81 | {Opt_listgid, "listgid=%u"}, | |
82 | {Opt_listmode, "listmode=%o"}, | |
83 | {Opt_err, NULL} | |
84 | }; | |
85 | ||
86 | static int parse_options(struct super_block *s, char *data) | |
87 | { | |
88 | char *p; | |
89 | int option; | |
90 | ||
91 | /* (re)set to defaults. */ | |
92 | devuid = 0; | |
93 | busuid = 0; | |
94 | listuid = 0; | |
95 | devgid = 0; | |
96 | busgid = 0; | |
97 | listgid = 0; | |
98 | devmode = S_IWUSR | S_IRUGO; | |
99 | busmode = S_IXUGO | S_IRUGO; | |
100 | listmode = S_IRUGO; | |
101 | ||
102 | while ((p = strsep(&data, ",")) != NULL) { | |
103 | substring_t args[MAX_OPT_ARGS]; | |
104 | int token; | |
105 | if (!*p) | |
106 | continue; | |
107 | ||
108 | token = match_token(p, tokens, args); | |
109 | switch (token) { | |
110 | case Opt_devuid: | |
111 | if (match_int(&args[0], &option)) | |
112 | return -EINVAL; | |
113 | devuid = option; | |
114 | break; | |
115 | case Opt_devgid: | |
116 | if (match_int(&args[0], &option)) | |
117 | return -EINVAL; | |
118 | devgid = option; | |
119 | break; | |
120 | case Opt_devmode: | |
121 | if (match_octal(&args[0], &option)) | |
122 | return -EINVAL; | |
123 | devmode = option & S_IRWXUGO; | |
124 | break; | |
125 | case Opt_busuid: | |
126 | if (match_int(&args[0], &option)) | |
127 | return -EINVAL; | |
128 | busuid = option; | |
129 | break; | |
130 | case Opt_busgid: | |
131 | if (match_int(&args[0], &option)) | |
132 | return -EINVAL; | |
133 | busgid = option; | |
134 | break; | |
135 | case Opt_busmode: | |
136 | if (match_octal(&args[0], &option)) | |
137 | return -EINVAL; | |
138 | busmode = option & S_IRWXUGO; | |
139 | break; | |
140 | case Opt_listuid: | |
141 | if (match_int(&args[0], &option)) | |
142 | return -EINVAL; | |
143 | listuid = option; | |
144 | break; | |
145 | case Opt_listgid: | |
146 | if (match_int(&args[0], &option)) | |
147 | return -EINVAL; | |
148 | listgid = option; | |
149 | break; | |
150 | case Opt_listmode: | |
151 | if (match_octal(&args[0], &option)) | |
152 | return -EINVAL; | |
153 | listmode = option & S_IRWXUGO; | |
154 | break; | |
155 | default: | |
156 | err("usbfs: unrecognised mount option \"%s\" " | |
157 | "or missing value\n", p); | |
158 | return -EINVAL; | |
159 | } | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static void update_special(struct dentry *special) | |
166 | { | |
167 | special->d_inode->i_uid = listuid; | |
168 | special->d_inode->i_gid = listgid; | |
169 | special->d_inode->i_mode = S_IFREG | listmode; | |
170 | } | |
171 | ||
172 | static void update_dev(struct dentry *dev) | |
173 | { | |
174 | dev->d_inode->i_uid = devuid; | |
175 | dev->d_inode->i_gid = devgid; | |
176 | dev->d_inode->i_mode = S_IFREG | devmode; | |
177 | } | |
178 | ||
179 | static void update_bus(struct dentry *bus) | |
180 | { | |
181 | struct dentry *dev = NULL; | |
182 | ||
183 | bus->d_inode->i_uid = busuid; | |
184 | bus->d_inode->i_gid = busgid; | |
185 | bus->d_inode->i_mode = S_IFDIR | busmode; | |
186 | ||
187 | down(&bus->d_inode->i_sem); | |
188 | ||
5160ee6f | 189 | list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child) |
1da177e4 LT |
190 | if (dev->d_inode) |
191 | update_dev(dev); | |
192 | ||
193 | up(&bus->d_inode->i_sem); | |
194 | } | |
195 | ||
196 | static void update_sb(struct super_block *sb) | |
197 | { | |
198 | struct dentry *root = sb->s_root; | |
199 | struct dentry *bus = NULL; | |
200 | ||
201 | if (!root) | |
202 | return; | |
203 | ||
204 | down(&root->d_inode->i_sem); | |
205 | ||
5160ee6f | 206 | list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) { |
1da177e4 LT |
207 | if (bus->d_inode) { |
208 | switch (S_IFMT & bus->d_inode->i_mode) { | |
209 | case S_IFDIR: | |
210 | update_bus(bus); | |
211 | break; | |
212 | case S_IFREG: | |
213 | update_special(bus); | |
214 | break; | |
215 | default: | |
216 | warn("Unknown node %s mode %x found on remount!\n",bus->d_name.name,bus->d_inode->i_mode); | |
217 | break; | |
218 | } | |
219 | } | |
220 | } | |
221 | ||
222 | up(&root->d_inode->i_sem); | |
223 | } | |
224 | ||
225 | static int remount(struct super_block *sb, int *flags, char *data) | |
226 | { | |
227 | /* If this is not a real mount, | |
228 | * i.e. it's a simple_pin_fs from create_special_files, | |
229 | * then ignore it. | |
230 | */ | |
231 | if (ignore_mount) | |
232 | return 0; | |
233 | ||
234 | if (parse_options(sb, data)) { | |
235 | warn("usbfs: mount parameter error:"); | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
239 | if (usbfs_mount && usbfs_mount->mnt_sb) | |
240 | update_sb(usbfs_mount->mnt_sb); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev) | |
246 | { | |
247 | struct inode *inode = new_inode(sb); | |
248 | ||
249 | if (inode) { | |
250 | inode->i_mode = mode; | |
251 | inode->i_uid = current->fsuid; | |
252 | inode->i_gid = current->fsgid; | |
253 | inode->i_blksize = PAGE_CACHE_SIZE; | |
254 | inode->i_blocks = 0; | |
255 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
256 | switch (mode & S_IFMT) { | |
257 | default: | |
258 | init_special_inode(inode, mode, dev); | |
259 | break; | |
260 | case S_IFREG: | |
261 | inode->i_fop = &default_file_operations; | |
262 | break; | |
263 | case S_IFDIR: | |
bc7cb323 | 264 | inode->i_op = &simple_dir_inode_operations; |
1da177e4 LT |
265 | inode->i_fop = &simple_dir_operations; |
266 | ||
267 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
268 | inode->i_nlink++; | |
269 | break; | |
270 | } | |
271 | } | |
272 | return inode; | |
273 | } | |
274 | ||
275 | /* SMP-safe */ | |
276 | static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode, | |
277 | dev_t dev) | |
278 | { | |
279 | struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev); | |
280 | int error = -EPERM; | |
281 | ||
282 | if (dentry->d_inode) | |
283 | return -EEXIST; | |
284 | ||
285 | if (inode) { | |
286 | d_instantiate(dentry, inode); | |
287 | dget(dentry); | |
288 | error = 0; | |
289 | } | |
290 | return error; | |
291 | } | |
292 | ||
293 | static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode) | |
294 | { | |
295 | int res; | |
296 | ||
297 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
298 | res = usbfs_mknod (dir, dentry, mode, 0); | |
299 | if (!res) | |
300 | dir->i_nlink++; | |
301 | return res; | |
302 | } | |
303 | ||
304 | static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode) | |
305 | { | |
306 | mode = (mode & S_IALLUGO) | S_IFREG; | |
307 | return usbfs_mknod (dir, dentry, mode, 0); | |
308 | } | |
309 | ||
310 | static inline int usbfs_positive (struct dentry *dentry) | |
311 | { | |
312 | return dentry->d_inode && !d_unhashed(dentry); | |
313 | } | |
314 | ||
315 | static int usbfs_empty (struct dentry *dentry) | |
316 | { | |
317 | struct list_head *list; | |
318 | ||
319 | spin_lock(&dcache_lock); | |
320 | ||
321 | list_for_each(list, &dentry->d_subdirs) { | |
5160ee6f | 322 | struct dentry *de = list_entry(list, struct dentry, d_u.d_child); |
1da177e4 LT |
323 | if (usbfs_positive(de)) { |
324 | spin_unlock(&dcache_lock); | |
325 | return 0; | |
326 | } | |
327 | } | |
328 | ||
329 | spin_unlock(&dcache_lock); | |
330 | return 1; | |
331 | } | |
332 | ||
333 | static int usbfs_unlink (struct inode *dir, struct dentry *dentry) | |
334 | { | |
335 | struct inode *inode = dentry->d_inode; | |
336 | down(&inode->i_sem); | |
337 | dentry->d_inode->i_nlink--; | |
338 | dput(dentry); | |
339 | up(&inode->i_sem); | |
340 | d_delete(dentry); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static int usbfs_rmdir(struct inode *dir, struct dentry *dentry) | |
345 | { | |
346 | int error = -ENOTEMPTY; | |
347 | struct inode * inode = dentry->d_inode; | |
348 | ||
349 | down(&inode->i_sem); | |
350 | dentry_unhash(dentry); | |
351 | if (usbfs_empty(dentry)) { | |
352 | dentry->d_inode->i_nlink -= 2; | |
353 | dput(dentry); | |
354 | inode->i_flags |= S_DEAD; | |
355 | dir->i_nlink--; | |
356 | error = 0; | |
357 | } | |
358 | up(&inode->i_sem); | |
359 | if (!error) | |
360 | d_delete(dentry); | |
361 | dput(dentry); | |
362 | return error; | |
363 | } | |
364 | ||
365 | ||
366 | /* default file operations */ | |
367 | static ssize_t default_read_file (struct file *file, char __user *buf, | |
368 | size_t count, loff_t *ppos) | |
369 | { | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static ssize_t default_write_file (struct file *file, const char __user *buf, | |
374 | size_t count, loff_t *ppos) | |
375 | { | |
376 | return count; | |
377 | } | |
378 | ||
379 | static loff_t default_file_lseek (struct file *file, loff_t offset, int orig) | |
380 | { | |
381 | loff_t retval = -EINVAL; | |
382 | ||
383 | down(&file->f_dentry->d_inode->i_sem); | |
384 | switch(orig) { | |
385 | case 0: | |
386 | if (offset > 0) { | |
387 | file->f_pos = offset; | |
388 | retval = file->f_pos; | |
389 | } | |
390 | break; | |
391 | case 1: | |
392 | if ((offset + file->f_pos) > 0) { | |
393 | file->f_pos += offset; | |
394 | retval = file->f_pos; | |
395 | } | |
396 | break; | |
397 | default: | |
398 | break; | |
399 | } | |
400 | up(&file->f_dentry->d_inode->i_sem); | |
401 | return retval; | |
402 | } | |
403 | ||
404 | static int default_open (struct inode *inode, struct file *file) | |
405 | { | |
406 | if (inode->u.generic_ip) | |
407 | file->private_data = inode->u.generic_ip; | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static struct file_operations default_file_operations = { | |
413 | .read = default_read_file, | |
414 | .write = default_write_file, | |
415 | .open = default_open, | |
416 | .llseek = default_file_lseek, | |
417 | }; | |
418 | ||
1da177e4 LT |
419 | static struct super_operations usbfs_ops = { |
420 | .statfs = simple_statfs, | |
421 | .drop_inode = generic_delete_inode, | |
422 | .remount_fs = remount, | |
423 | }; | |
424 | ||
425 | static int usbfs_fill_super(struct super_block *sb, void *data, int silent) | |
426 | { | |
427 | struct inode *inode; | |
428 | struct dentry *root; | |
429 | ||
430 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
431 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
432 | sb->s_magic = USBDEVICE_SUPER_MAGIC; | |
433 | sb->s_op = &usbfs_ops; | |
434 | sb->s_time_gran = 1; | |
435 | inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0); | |
436 | ||
437 | if (!inode) { | |
438 | dbg("%s: could not get inode!",__FUNCTION__); | |
439 | return -ENOMEM; | |
440 | } | |
441 | ||
442 | root = d_alloc_root(inode); | |
443 | if (!root) { | |
444 | dbg("%s: could not get root dentry!",__FUNCTION__); | |
445 | iput(inode); | |
446 | return -ENOMEM; | |
447 | } | |
448 | sb->s_root = root; | |
449 | return 0; | |
450 | } | |
451 | ||
1da177e4 LT |
452 | /* |
453 | * fs_create_by_name - create a file, given a name | |
454 | * @name: name of file | |
455 | * @mode: type of file | |
456 | * @parent: dentry of directory to create it in | |
457 | * @dentry: resulting dentry of file | |
458 | * | |
459 | * This function handles both regular files and directories. | |
460 | */ | |
461 | static int fs_create_by_name (const char *name, mode_t mode, | |
462 | struct dentry *parent, struct dentry **dentry) | |
463 | { | |
464 | int error = 0; | |
465 | ||
466 | /* If the parent is not specified, we create it in the root. | |
467 | * We need the root dentry to do this, which is in the super | |
468 | * block. A pointer to that is in the struct vfsmount that we | |
469 | * have around. | |
470 | */ | |
471 | if (!parent ) { | |
472 | if (usbfs_mount && usbfs_mount->mnt_sb) { | |
473 | parent = usbfs_mount->mnt_sb->s_root; | |
474 | } | |
475 | } | |
476 | ||
477 | if (!parent) { | |
478 | dbg("Ah! can not find a parent!"); | |
479 | return -EFAULT; | |
480 | } | |
481 | ||
482 | *dentry = NULL; | |
483 | down(&parent->d_inode->i_sem); | |
5f45f1a7 | 484 | *dentry = lookup_one_len(name, parent, strlen(name)); |
1da177e4 LT |
485 | if (!IS_ERR(dentry)) { |
486 | if ((mode & S_IFMT) == S_IFDIR) | |
487 | error = usbfs_mkdir (parent->d_inode, *dentry, mode); | |
488 | else | |
489 | error = usbfs_create (parent->d_inode, *dentry, mode); | |
490 | } else | |
491 | error = PTR_ERR(dentry); | |
492 | up(&parent->d_inode->i_sem); | |
493 | ||
494 | return error; | |
495 | } | |
496 | ||
497 | static struct dentry *fs_create_file (const char *name, mode_t mode, | |
498 | struct dentry *parent, void *data, | |
499 | struct file_operations *fops, | |
500 | uid_t uid, gid_t gid) | |
501 | { | |
502 | struct dentry *dentry; | |
503 | int error; | |
504 | ||
505 | dbg("creating file '%s'",name); | |
506 | ||
507 | error = fs_create_by_name (name, mode, parent, &dentry); | |
508 | if (error) { | |
509 | dentry = NULL; | |
510 | } else { | |
511 | if (dentry->d_inode) { | |
512 | if (data) | |
513 | dentry->d_inode->u.generic_ip = data; | |
514 | if (fops) | |
515 | dentry->d_inode->i_fop = fops; | |
516 | dentry->d_inode->i_uid = uid; | |
517 | dentry->d_inode->i_gid = gid; | |
518 | } | |
519 | } | |
520 | ||
521 | return dentry; | |
522 | } | |
523 | ||
524 | static void fs_remove_file (struct dentry *dentry) | |
525 | { | |
526 | struct dentry *parent = dentry->d_parent; | |
527 | ||
528 | if (!parent || !parent->d_inode) | |
529 | return; | |
530 | ||
531 | down(&parent->d_inode->i_sem); | |
532 | if (usbfs_positive(dentry)) { | |
533 | if (dentry->d_inode) { | |
534 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
535 | usbfs_rmdir(parent->d_inode, dentry); | |
536 | else | |
537 | usbfs_unlink(parent->d_inode, dentry); | |
538 | dput(dentry); | |
539 | } | |
540 | } | |
541 | up(&parent->d_inode->i_sem); | |
542 | } | |
543 | ||
544 | /* --------------------------------------------------------------------- */ | |
545 | ||
546 | static struct super_block *usb_get_sb(struct file_system_type *fs_type, | |
547 | int flags, const char *dev_name, void *data) | |
548 | { | |
549 | return get_sb_single(fs_type, flags, data, usbfs_fill_super); | |
550 | } | |
551 | ||
552 | static struct file_system_type usb_fs_type = { | |
553 | .owner = THIS_MODULE, | |
554 | .name = "usbfs", | |
555 | .get_sb = usb_get_sb, | |
556 | .kill_sb = kill_litter_super, | |
557 | }; | |
558 | ||
559 | /* --------------------------------------------------------------------- */ | |
560 | ||
561 | static int create_special_files (void) | |
562 | { | |
563 | struct dentry *parent; | |
564 | int retval; | |
565 | ||
566 | /* the simple_pin_fs calls will call remount with no options | |
567 | * without this flag that would overwrite the real mount options (if any) | |
568 | */ | |
569 | ignore_mount = 1; | |
570 | ||
571 | /* create the devices special file */ | |
572 | retval = simple_pin_fs("usbfs", &usbfs_mount, &usbfs_mount_count); | |
573 | if (retval) { | |
574 | err ("Unable to get usbfs mount"); | |
575 | goto exit; | |
576 | } | |
577 | ||
578 | ignore_mount = 0; | |
579 | ||
580 | parent = usbfs_mount->mnt_sb->s_root; | |
581 | devices_usbfs_dentry = fs_create_file ("devices", | |
582 | listmode | S_IFREG, parent, | |
583 | NULL, &usbfs_devices_fops, | |
584 | listuid, listgid); | |
585 | if (devices_usbfs_dentry == NULL) { | |
586 | err ("Unable to create devices usbfs file"); | |
587 | retval = -ENODEV; | |
588 | goto error_clean_mounts; | |
589 | } | |
590 | ||
591 | goto exit; | |
592 | ||
593 | error_clean_mounts: | |
594 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
595 | exit: | |
596 | return retval; | |
597 | } | |
598 | ||
599 | static void remove_special_files (void) | |
600 | { | |
601 | if (devices_usbfs_dentry) | |
602 | fs_remove_file (devices_usbfs_dentry); | |
603 | devices_usbfs_dentry = NULL; | |
604 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
605 | } | |
606 | ||
607 | void usbfs_update_special (void) | |
608 | { | |
609 | struct inode *inode; | |
610 | ||
611 | if (devices_usbfs_dentry) { | |
612 | inode = devices_usbfs_dentry->d_inode; | |
613 | if (inode) | |
614 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
615 | } | |
616 | } | |
617 | ||
54a5c4cd | 618 | static void usbfs_add_bus(struct usb_bus *bus) |
1da177e4 LT |
619 | { |
620 | struct dentry *parent; | |
621 | char name[8]; | |
622 | int retval; | |
623 | ||
624 | /* create the special files if this is the first bus added */ | |
625 | if (num_buses == 0) { | |
626 | retval = create_special_files(); | |
627 | if (retval) | |
628 | return; | |
629 | } | |
630 | ++num_buses; | |
631 | ||
632 | sprintf (name, "%03d", bus->busnum); | |
633 | ||
634 | parent = usbfs_mount->mnt_sb->s_root; | |
635 | bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent, | |
636 | bus, NULL, busuid, busgid); | |
637 | if (bus->usbfs_dentry == NULL) { | |
638 | err ("error creating usbfs bus entry"); | |
639 | return; | |
640 | } | |
1da177e4 LT |
641 | } |
642 | ||
54a5c4cd | 643 | static void usbfs_remove_bus(struct usb_bus *bus) |
1da177e4 LT |
644 | { |
645 | if (bus->usbfs_dentry) { | |
646 | fs_remove_file (bus->usbfs_dentry); | |
647 | bus->usbfs_dentry = NULL; | |
648 | } | |
649 | ||
650 | --num_buses; | |
651 | if (num_buses <= 0) { | |
652 | remove_special_files(); | |
653 | num_buses = 0; | |
654 | } | |
1da177e4 LT |
655 | } |
656 | ||
54a5c4cd | 657 | static void usbfs_add_device(struct usb_device *dev) |
1da177e4 LT |
658 | { |
659 | char name[8]; | |
660 | int i; | |
661 | int i_size; | |
662 | ||
663 | sprintf (name, "%03d", dev->devnum); | |
664 | dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG, | |
665 | dev->bus->usbfs_dentry, dev, | |
666 | &usbfs_device_file_operations, | |
667 | devuid, devgid); | |
668 | if (dev->usbfs_dentry == NULL) { | |
669 | err ("error creating usbfs device entry"); | |
670 | return; | |
671 | } | |
672 | ||
673 | /* Set the size of the device's file to be | |
674 | * equal to the size of the device descriptors. */ | |
675 | i_size = sizeof (struct usb_device_descriptor); | |
676 | for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) { | |
677 | struct usb_config_descriptor *config = | |
678 | (struct usb_config_descriptor *)dev->rawdescriptors[i]; | |
679 | i_size += le16_to_cpu(config->wTotalLength); | |
680 | } | |
681 | if (dev->usbfs_dentry->d_inode) | |
682 | dev->usbfs_dentry->d_inode->i_size = i_size; | |
1da177e4 LT |
683 | } |
684 | ||
54a5c4cd | 685 | static void usbfs_remove_device(struct usb_device *dev) |
1da177e4 LT |
686 | { |
687 | struct dev_state *ds; | |
688 | struct siginfo sinfo; | |
689 | ||
690 | if (dev->usbfs_dentry) { | |
691 | fs_remove_file (dev->usbfs_dentry); | |
692 | dev->usbfs_dentry = NULL; | |
693 | } | |
694 | while (!list_empty(&dev->filelist)) { | |
695 | ds = list_entry(dev->filelist.next, struct dev_state, list); | |
696 | wake_up_all(&ds->wait); | |
697 | list_del_init(&ds->list); | |
698 | if (ds->discsignr) { | |
699 | sinfo.si_signo = SIGPIPE; | |
700 | sinfo.si_errno = EPIPE; | |
701 | sinfo.si_code = SI_ASYNCIO; | |
702 | sinfo.si_addr = ds->disccontext; | |
d7dd8a72 | 703 | kill_proc_info_as_uid(ds->discsignr, &sinfo, ds->disc_pid, ds->disc_uid, ds->disc_euid); |
1da177e4 LT |
704 | } |
705 | } | |
54a5c4cd GKH |
706 | } |
707 | ||
708 | static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev) | |
709 | { | |
710 | switch (action) { | |
711 | case USB_DEVICE_ADD: | |
712 | usbfs_add_device(dev); | |
713 | break; | |
714 | case USB_DEVICE_REMOVE: | |
715 | usbfs_remove_device(dev); | |
716 | break; | |
717 | case USB_BUS_ADD: | |
718 | usbfs_add_bus(dev); | |
719 | break; | |
720 | case USB_BUS_REMOVE: | |
721 | usbfs_remove_bus(dev); | |
722 | } | |
723 | ||
1da177e4 LT |
724 | usbfs_update_special(); |
725 | usbfs_conn_disc_event(); | |
54a5c4cd | 726 | return NOTIFY_OK; |
1da177e4 LT |
727 | } |
728 | ||
54a5c4cd GKH |
729 | static struct notifier_block usbfs_nb = { |
730 | .notifier_call = usbfs_notify, | |
731 | }; | |
732 | ||
1da177e4 LT |
733 | /* --------------------------------------------------------------------- */ |
734 | ||
735 | static struct proc_dir_entry *usbdir = NULL; | |
736 | ||
737 | int __init usbfs_init(void) | |
738 | { | |
739 | int retval; | |
740 | ||
1da177e4 | 741 | retval = register_filesystem(&usb_fs_type); |
fbf82fd2 | 742 | if (retval) |
1da177e4 | 743 | return retval; |
1da177e4 | 744 | |
54a5c4cd GKH |
745 | usb_register_notify(&usbfs_nb); |
746 | ||
1da177e4 LT |
747 | /* create mount point for usbfs */ |
748 | usbdir = proc_mkdir("usb", proc_bus); | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | void usbfs_cleanup(void) | |
754 | { | |
54a5c4cd | 755 | usb_unregister_notify(&usbfs_nb); |
1da177e4 LT |
756 | unregister_filesystem(&usb_fs_type); |
757 | if (usbdir) | |
758 | remove_proc_entry("usb", proc_bus); | |
759 | } | |
760 |