Commit | Line | Data |
---|---|---|
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; | |
47 | static 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; | |
252 | inode->i_blksize = PAGE_CACHE_SIZE; | |
253 | inode->i_blocks = 0; | |
254 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
255 | switch (mode & S_IFMT) { | |
256 | default: | |
257 | init_special_inode(inode, mode, dev); | |
258 | break; | |
259 | case S_IFREG: | |
260 | inode->i_fop = &default_file_operations; | |
261 | break; | |
262 | case S_IFDIR: | |
bc7cb323 | 263 | inode->i_op = &simple_dir_inode_operations; |
1da177e4 LT |
264 | inode->i_fop = &simple_dir_operations; |
265 | ||
266 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
267 | inode->i_nlink++; | |
268 | break; | |
269 | } | |
270 | } | |
271 | return inode; | |
272 | } | |
273 | ||
274 | /* SMP-safe */ | |
275 | static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode, | |
276 | dev_t dev) | |
277 | { | |
278 | struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev); | |
279 | int error = -EPERM; | |
280 | ||
281 | if (dentry->d_inode) | |
282 | return -EEXIST; | |
283 | ||
284 | if (inode) { | |
285 | d_instantiate(dentry, inode); | |
286 | dget(dentry); | |
287 | error = 0; | |
288 | } | |
289 | return error; | |
290 | } | |
291 | ||
292 | static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode) | |
293 | { | |
294 | int res; | |
295 | ||
296 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
297 | res = usbfs_mknod (dir, dentry, mode, 0); | |
298 | if (!res) | |
299 | dir->i_nlink++; | |
300 | return res; | |
301 | } | |
302 | ||
303 | static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode) | |
304 | { | |
305 | mode = (mode & S_IALLUGO) | S_IFREG; | |
306 | return usbfs_mknod (dir, dentry, mode, 0); | |
307 | } | |
308 | ||
309 | static inline int usbfs_positive (struct dentry *dentry) | |
310 | { | |
311 | return dentry->d_inode && !d_unhashed(dentry); | |
312 | } | |
313 | ||
314 | static int usbfs_empty (struct dentry *dentry) | |
315 | { | |
316 | struct list_head *list; | |
317 | ||
318 | spin_lock(&dcache_lock); | |
319 | ||
320 | list_for_each(list, &dentry->d_subdirs) { | |
5160ee6f | 321 | struct dentry *de = list_entry(list, struct dentry, d_u.d_child); |
1da177e4 LT |
322 | if (usbfs_positive(de)) { |
323 | spin_unlock(&dcache_lock); | |
324 | return 0; | |
325 | } | |
326 | } | |
327 | ||
328 | spin_unlock(&dcache_lock); | |
329 | return 1; | |
330 | } | |
331 | ||
332 | static int usbfs_unlink (struct inode *dir, struct dentry *dentry) | |
333 | { | |
334 | struct inode *inode = dentry->d_inode; | |
1b1dcc1b | 335 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
336 | dentry->d_inode->i_nlink--; |
337 | dput(dentry); | |
1b1dcc1b | 338 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
339 | d_delete(dentry); |
340 | return 0; | |
341 | } | |
342 | ||
343 | static int usbfs_rmdir(struct inode *dir, struct dentry *dentry) | |
344 | { | |
345 | int error = -ENOTEMPTY; | |
346 | struct inode * inode = dentry->d_inode; | |
347 | ||
1b1dcc1b | 348 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
349 | dentry_unhash(dentry); |
350 | if (usbfs_empty(dentry)) { | |
351 | dentry->d_inode->i_nlink -= 2; | |
352 | dput(dentry); | |
353 | inode->i_flags |= S_DEAD; | |
354 | dir->i_nlink--; | |
355 | error = 0; | |
356 | } | |
1b1dcc1b | 357 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
358 | if (!error) |
359 | d_delete(dentry); | |
360 | dput(dentry); | |
361 | return error; | |
362 | } | |
363 | ||
364 | ||
365 | /* default file operations */ | |
366 | static ssize_t default_read_file (struct file *file, char __user *buf, | |
367 | size_t count, loff_t *ppos) | |
368 | { | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static ssize_t default_write_file (struct file *file, const char __user *buf, | |
373 | size_t count, loff_t *ppos) | |
374 | { | |
375 | return count; | |
376 | } | |
377 | ||
378 | static loff_t default_file_lseek (struct file *file, loff_t offset, int orig) | |
379 | { | |
380 | loff_t retval = -EINVAL; | |
381 | ||
1b1dcc1b | 382 | mutex_lock(&file->f_dentry->d_inode->i_mutex); |
1da177e4 LT |
383 | switch(orig) { |
384 | case 0: | |
385 | if (offset > 0) { | |
386 | file->f_pos = offset; | |
387 | retval = file->f_pos; | |
388 | } | |
389 | break; | |
390 | case 1: | |
391 | if ((offset + file->f_pos) > 0) { | |
392 | file->f_pos += offset; | |
393 | retval = file->f_pos; | |
394 | } | |
395 | break; | |
396 | default: | |
397 | break; | |
398 | } | |
1b1dcc1b | 399 | mutex_unlock(&file->f_dentry->d_inode->i_mutex); |
1da177e4 LT |
400 | return retval; |
401 | } | |
402 | ||
403 | static int default_open (struct inode *inode, struct file *file) | |
404 | { | |
405 | if (inode->u.generic_ip) | |
406 | file->private_data = inode->u.generic_ip; | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | static struct file_operations default_file_operations = { | |
412 | .read = default_read_file, | |
413 | .write = default_write_file, | |
414 | .open = default_open, | |
415 | .llseek = default_file_lseek, | |
416 | }; | |
417 | ||
1da177e4 LT |
418 | static struct super_operations usbfs_ops = { |
419 | .statfs = simple_statfs, | |
420 | .drop_inode = generic_delete_inode, | |
421 | .remount_fs = remount, | |
422 | }; | |
423 | ||
424 | static int usbfs_fill_super(struct super_block *sb, void *data, int silent) | |
425 | { | |
426 | struct inode *inode; | |
427 | struct dentry *root; | |
428 | ||
429 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
430 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
431 | sb->s_magic = USBDEVICE_SUPER_MAGIC; | |
432 | sb->s_op = &usbfs_ops; | |
433 | sb->s_time_gran = 1; | |
434 | inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0); | |
435 | ||
436 | if (!inode) { | |
437 | dbg("%s: could not get inode!",__FUNCTION__); | |
438 | return -ENOMEM; | |
439 | } | |
440 | ||
441 | root = d_alloc_root(inode); | |
442 | if (!root) { | |
443 | dbg("%s: could not get root dentry!",__FUNCTION__); | |
444 | iput(inode); | |
445 | return -ENOMEM; | |
446 | } | |
447 | sb->s_root = root; | |
448 | return 0; | |
449 | } | |
450 | ||
1da177e4 LT |
451 | /* |
452 | * fs_create_by_name - create a file, given a name | |
453 | * @name: name of file | |
454 | * @mode: type of file | |
455 | * @parent: dentry of directory to create it in | |
456 | * @dentry: resulting dentry of file | |
457 | * | |
458 | * This function handles both regular files and directories. | |
459 | */ | |
460 | static int fs_create_by_name (const char *name, mode_t mode, | |
461 | struct dentry *parent, struct dentry **dentry) | |
462 | { | |
463 | int error = 0; | |
464 | ||
465 | /* If the parent is not specified, we create it in the root. | |
466 | * We need the root dentry to do this, which is in the super | |
467 | * block. A pointer to that is in the struct vfsmount that we | |
468 | * have around. | |
469 | */ | |
470 | if (!parent ) { | |
471 | if (usbfs_mount && usbfs_mount->mnt_sb) { | |
472 | parent = usbfs_mount->mnt_sb->s_root; | |
473 | } | |
474 | } | |
475 | ||
476 | if (!parent) { | |
477 | dbg("Ah! can not find a parent!"); | |
478 | return -EFAULT; | |
479 | } | |
480 | ||
481 | *dentry = NULL; | |
1b1dcc1b | 482 | mutex_lock(&parent->d_inode->i_mutex); |
5f45f1a7 | 483 | *dentry = lookup_one_len(name, parent, strlen(name)); |
1da177e4 LT |
484 | if (!IS_ERR(dentry)) { |
485 | if ((mode & S_IFMT) == S_IFDIR) | |
486 | error = usbfs_mkdir (parent->d_inode, *dentry, mode); | |
487 | else | |
488 | error = usbfs_create (parent->d_inode, *dentry, mode); | |
489 | } else | |
490 | error = PTR_ERR(dentry); | |
1b1dcc1b | 491 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
492 | |
493 | return error; | |
494 | } | |
495 | ||
496 | static struct dentry *fs_create_file (const char *name, mode_t mode, | |
497 | struct dentry *parent, void *data, | |
498 | struct file_operations *fops, | |
499 | uid_t uid, gid_t gid) | |
500 | { | |
501 | struct dentry *dentry; | |
502 | int error; | |
503 | ||
504 | dbg("creating file '%s'",name); | |
505 | ||
506 | error = fs_create_by_name (name, mode, parent, &dentry); | |
507 | if (error) { | |
508 | dentry = NULL; | |
509 | } else { | |
510 | if (dentry->d_inode) { | |
511 | if (data) | |
512 | dentry->d_inode->u.generic_ip = data; | |
513 | if (fops) | |
514 | dentry->d_inode->i_fop = fops; | |
515 | dentry->d_inode->i_uid = uid; | |
516 | dentry->d_inode->i_gid = gid; | |
517 | } | |
518 | } | |
519 | ||
520 | return dentry; | |
521 | } | |
522 | ||
523 | static void fs_remove_file (struct dentry *dentry) | |
524 | { | |
525 | struct dentry *parent = dentry->d_parent; | |
526 | ||
527 | if (!parent || !parent->d_inode) | |
528 | return; | |
529 | ||
1b1dcc1b | 530 | mutex_lock(&parent->d_inode->i_mutex); |
1da177e4 LT |
531 | if (usbfs_positive(dentry)) { |
532 | if (dentry->d_inode) { | |
533 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
534 | usbfs_rmdir(parent->d_inode, dentry); | |
535 | else | |
536 | usbfs_unlink(parent->d_inode, dentry); | |
537 | dput(dentry); | |
538 | } | |
539 | } | |
1b1dcc1b | 540 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
541 | } |
542 | ||
543 | /* --------------------------------------------------------------------- */ | |
544 | ||
454e2398 DH |
545 | static int usb_get_sb(struct file_system_type *fs_type, |
546 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 547 | { |
454e2398 | 548 | return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt); |
1da177e4 LT |
549 | } |
550 | ||
551 | static struct file_system_type usb_fs_type = { | |
552 | .owner = THIS_MODULE, | |
553 | .name = "usbfs", | |
554 | .get_sb = usb_get_sb, | |
555 | .kill_sb = kill_litter_super, | |
556 | }; | |
557 | ||
558 | /* --------------------------------------------------------------------- */ | |
559 | ||
560 | static int create_special_files (void) | |
561 | { | |
562 | struct dentry *parent; | |
563 | int retval; | |
564 | ||
565 | /* the simple_pin_fs calls will call remount with no options | |
566 | * without this flag that would overwrite the real mount options (if any) | |
567 | */ | |
568 | ignore_mount = 1; | |
569 | ||
570 | /* create the devices special file */ | |
1f5ce9e9 | 571 | retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count); |
1da177e4 LT |
572 | if (retval) { |
573 | err ("Unable to get usbfs mount"); | |
574 | goto exit; | |
575 | } | |
576 | ||
577 | ignore_mount = 0; | |
578 | ||
579 | parent = usbfs_mount->mnt_sb->s_root; | |
580 | devices_usbfs_dentry = fs_create_file ("devices", | |
581 | listmode | S_IFREG, parent, | |
582 | NULL, &usbfs_devices_fops, | |
583 | listuid, listgid); | |
584 | if (devices_usbfs_dentry == NULL) { | |
585 | err ("Unable to create devices usbfs file"); | |
586 | retval = -ENODEV; | |
587 | goto error_clean_mounts; | |
588 | } | |
589 | ||
590 | goto exit; | |
591 | ||
592 | error_clean_mounts: | |
593 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
594 | exit: | |
595 | return retval; | |
596 | } | |
597 | ||
598 | static void remove_special_files (void) | |
599 | { | |
600 | if (devices_usbfs_dentry) | |
601 | fs_remove_file (devices_usbfs_dentry); | |
602 | devices_usbfs_dentry = NULL; | |
603 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
604 | } | |
605 | ||
606 | void usbfs_update_special (void) | |
607 | { | |
608 | struct inode *inode; | |
609 | ||
610 | if (devices_usbfs_dentry) { | |
611 | inode = devices_usbfs_dentry->d_inode; | |
612 | if (inode) | |
613 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
614 | } | |
615 | } | |
616 | ||
54a5c4cd | 617 | static void usbfs_add_bus(struct usb_bus *bus) |
1da177e4 LT |
618 | { |
619 | struct dentry *parent; | |
620 | char name[8]; | |
621 | int retval; | |
622 | ||
623 | /* create the special files if this is the first bus added */ | |
624 | if (num_buses == 0) { | |
625 | retval = create_special_files(); | |
626 | if (retval) | |
627 | return; | |
628 | } | |
629 | ++num_buses; | |
630 | ||
631 | sprintf (name, "%03d", bus->busnum); | |
632 | ||
633 | parent = usbfs_mount->mnt_sb->s_root; | |
634 | bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent, | |
635 | bus, NULL, busuid, busgid); | |
636 | if (bus->usbfs_dentry == NULL) { | |
637 | err ("error creating usbfs bus entry"); | |
638 | return; | |
639 | } | |
1da177e4 LT |
640 | } |
641 | ||
54a5c4cd | 642 | static void usbfs_remove_bus(struct usb_bus *bus) |
1da177e4 LT |
643 | { |
644 | if (bus->usbfs_dentry) { | |
645 | fs_remove_file (bus->usbfs_dentry); | |
646 | bus->usbfs_dentry = NULL; | |
647 | } | |
648 | ||
649 | --num_buses; | |
650 | if (num_buses <= 0) { | |
651 | remove_special_files(); | |
652 | num_buses = 0; | |
653 | } | |
1da177e4 LT |
654 | } |
655 | ||
54a5c4cd | 656 | static void usbfs_add_device(struct usb_device *dev) |
1da177e4 LT |
657 | { |
658 | char name[8]; | |
659 | int i; | |
660 | int i_size; | |
661 | ||
662 | sprintf (name, "%03d", dev->devnum); | |
663 | dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG, | |
664 | dev->bus->usbfs_dentry, dev, | |
665 | &usbfs_device_file_operations, | |
666 | devuid, devgid); | |
667 | if (dev->usbfs_dentry == NULL) { | |
668 | err ("error creating usbfs device entry"); | |
669 | return; | |
670 | } | |
671 | ||
672 | /* Set the size of the device's file to be | |
673 | * equal to the size of the device descriptors. */ | |
674 | i_size = sizeof (struct usb_device_descriptor); | |
675 | for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) { | |
676 | struct usb_config_descriptor *config = | |
677 | (struct usb_config_descriptor *)dev->rawdescriptors[i]; | |
678 | i_size += le16_to_cpu(config->wTotalLength); | |
679 | } | |
680 | if (dev->usbfs_dentry->d_inode) | |
681 | dev->usbfs_dentry->d_inode->i_size = i_size; | |
1da177e4 LT |
682 | } |
683 | ||
54a5c4cd | 684 | static void usbfs_remove_device(struct usb_device *dev) |
1da177e4 LT |
685 | { |
686 | struct dev_state *ds; | |
687 | struct siginfo sinfo; | |
688 | ||
689 | if (dev->usbfs_dentry) { | |
690 | fs_remove_file (dev->usbfs_dentry); | |
691 | dev->usbfs_dentry = NULL; | |
692 | } | |
693 | while (!list_empty(&dev->filelist)) { | |
694 | ds = list_entry(dev->filelist.next, struct dev_state, list); | |
695 | wake_up_all(&ds->wait); | |
696 | list_del_init(&ds->list); | |
697 | if (ds->discsignr) { | |
698 | sinfo.si_signo = SIGPIPE; | |
699 | sinfo.si_errno = EPIPE; | |
700 | sinfo.si_code = SI_ASYNCIO; | |
701 | sinfo.si_addr = ds->disccontext; | |
7a01955f | 702 | kill_proc_info_as_uid(ds->discsignr, &sinfo, ds->disc_pid, ds->disc_uid, ds->disc_euid, ds->secid); |
1da177e4 LT |
703 | } |
704 | } | |
54a5c4cd GKH |
705 | } |
706 | ||
707 | static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev) | |
708 | { | |
709 | switch (action) { | |
710 | case USB_DEVICE_ADD: | |
711 | usbfs_add_device(dev); | |
712 | break; | |
713 | case USB_DEVICE_REMOVE: | |
714 | usbfs_remove_device(dev); | |
715 | break; | |
716 | case USB_BUS_ADD: | |
717 | usbfs_add_bus(dev); | |
718 | break; | |
719 | case USB_BUS_REMOVE: | |
720 | usbfs_remove_bus(dev); | |
721 | } | |
722 | ||
1da177e4 LT |
723 | usbfs_update_special(); |
724 | usbfs_conn_disc_event(); | |
54a5c4cd | 725 | return NOTIFY_OK; |
1da177e4 LT |
726 | } |
727 | ||
54a5c4cd GKH |
728 | static struct notifier_block usbfs_nb = { |
729 | .notifier_call = usbfs_notify, | |
730 | }; | |
731 | ||
1da177e4 LT |
732 | /* --------------------------------------------------------------------- */ |
733 | ||
734 | static struct proc_dir_entry *usbdir = NULL; | |
735 | ||
736 | int __init usbfs_init(void) | |
737 | { | |
738 | int retval; | |
739 | ||
1da177e4 | 740 | retval = register_filesystem(&usb_fs_type); |
fbf82fd2 | 741 | if (retval) |
1da177e4 | 742 | return retval; |
1da177e4 | 743 | |
54a5c4cd GKH |
744 | usb_register_notify(&usbfs_nb); |
745 | ||
1da177e4 LT |
746 | /* create mount point for usbfs */ |
747 | usbdir = proc_mkdir("usb", proc_bus); | |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | void usbfs_cleanup(void) | |
753 | { | |
54a5c4cd | 754 | usb_unregister_notify(&usbfs_nb); |
1da177e4 LT |
755 | unregister_filesystem(&usb_fs_type); |
756 | if (usbdir) | |
757 | remove_proc_entry("usb", proc_bus); | |
758 | } | |
759 |