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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> | |
1da177e4 | 39 | #include <linux/parser.h> |
54a5c4cd | 40 | #include <linux/notifier.h> |
2e4f3c02 | 41 | #include <linux/seq_file.h> |
1da177e4 LT |
42 | #include <asm/byteorder.h> |
43 | #include "usb.h" | |
6d5e8254 | 44 | #include "hcd.h" |
1da177e4 | 45 | |
2e4f3c02 MS |
46 | #define USBFS_DEFAULT_DEVMODE (S_IWUSR | S_IRUGO) |
47 | #define USBFS_DEFAULT_BUSMODE (S_IXUGO | S_IRUGO) | |
48 | #define USBFS_DEFAULT_LISTMODE S_IRUGO | |
49 | ||
1da177e4 | 50 | static struct super_operations usbfs_ops; |
066202dd | 51 | static const struct file_operations default_file_operations; |
1da177e4 LT |
52 | static struct vfsmount *usbfs_mount; |
53 | static int usbfs_mount_count; /* = 0 */ | |
54 | static int ignore_mount = 0; | |
55 | ||
56 | static struct dentry *devices_usbfs_dentry; | |
57 | static int num_buses; /* = 0 */ | |
58 | ||
59 | static uid_t devuid; /* = 0 */ | |
60 | static uid_t busuid; /* = 0 */ | |
61 | static uid_t listuid; /* = 0 */ | |
62 | static gid_t devgid; /* = 0 */ | |
63 | static gid_t busgid; /* = 0 */ | |
64 | static gid_t listgid; /* = 0 */ | |
2e4f3c02 MS |
65 | static umode_t devmode = USBFS_DEFAULT_DEVMODE; |
66 | static umode_t busmode = USBFS_DEFAULT_BUSMODE; | |
67 | static umode_t listmode = USBFS_DEFAULT_LISTMODE; | |
68 | ||
69 | static int usbfs_show_options(struct seq_file *seq, struct vfsmount *mnt) | |
70 | { | |
71 | if (devuid != 0) | |
72 | seq_printf(seq, ",devuid=%u", devuid); | |
73 | if (devgid != 0) | |
74 | seq_printf(seq, ",devgid=%u", devgid); | |
75 | if (devmode != USBFS_DEFAULT_DEVMODE) | |
76 | seq_printf(seq, ",devmode=%o", devmode); | |
77 | if (busuid != 0) | |
78 | seq_printf(seq, ",busuid=%u", busuid); | |
79 | if (busgid != 0) | |
80 | seq_printf(seq, ",busgid=%u", busgid); | |
81 | if (busmode != USBFS_DEFAULT_BUSMODE) | |
82 | seq_printf(seq, ",busmode=%o", busmode); | |
83 | if (listuid != 0) | |
84 | seq_printf(seq, ",listuid=%u", listuid); | |
85 | if (listgid != 0) | |
86 | seq_printf(seq, ",listgid=%u", listgid); | |
87 | if (listmode != USBFS_DEFAULT_LISTMODE) | |
88 | seq_printf(seq, ",listmode=%o", listmode); | |
89 | ||
90 | return 0; | |
91 | } | |
1da177e4 LT |
92 | |
93 | enum { | |
94 | Opt_devuid, Opt_devgid, Opt_devmode, | |
95 | Opt_busuid, Opt_busgid, Opt_busmode, | |
96 | Opt_listuid, Opt_listgid, Opt_listmode, | |
97 | Opt_err, | |
98 | }; | |
99 | ||
a447c093 | 100 | static const match_table_t tokens = { |
1da177e4 LT |
101 | {Opt_devuid, "devuid=%u"}, |
102 | {Opt_devgid, "devgid=%u"}, | |
103 | {Opt_devmode, "devmode=%o"}, | |
104 | {Opt_busuid, "busuid=%u"}, | |
105 | {Opt_busgid, "busgid=%u"}, | |
106 | {Opt_busmode, "busmode=%o"}, | |
107 | {Opt_listuid, "listuid=%u"}, | |
108 | {Opt_listgid, "listgid=%u"}, | |
109 | {Opt_listmode, "listmode=%o"}, | |
110 | {Opt_err, NULL} | |
111 | }; | |
112 | ||
113 | static int parse_options(struct super_block *s, char *data) | |
114 | { | |
115 | char *p; | |
116 | int option; | |
117 | ||
118 | /* (re)set to defaults. */ | |
119 | devuid = 0; | |
120 | busuid = 0; | |
121 | listuid = 0; | |
122 | devgid = 0; | |
123 | busgid = 0; | |
124 | listgid = 0; | |
2e4f3c02 MS |
125 | devmode = USBFS_DEFAULT_DEVMODE; |
126 | busmode = USBFS_DEFAULT_BUSMODE; | |
127 | listmode = USBFS_DEFAULT_LISTMODE; | |
1da177e4 LT |
128 | |
129 | while ((p = strsep(&data, ",")) != NULL) { | |
130 | substring_t args[MAX_OPT_ARGS]; | |
131 | int token; | |
132 | if (!*p) | |
133 | continue; | |
134 | ||
135 | token = match_token(p, tokens, args); | |
136 | switch (token) { | |
137 | case Opt_devuid: | |
138 | if (match_int(&args[0], &option)) | |
139 | return -EINVAL; | |
140 | devuid = option; | |
141 | break; | |
142 | case Opt_devgid: | |
143 | if (match_int(&args[0], &option)) | |
144 | return -EINVAL; | |
145 | devgid = option; | |
146 | break; | |
147 | case Opt_devmode: | |
148 | if (match_octal(&args[0], &option)) | |
149 | return -EINVAL; | |
150 | devmode = option & S_IRWXUGO; | |
151 | break; | |
152 | case Opt_busuid: | |
153 | if (match_int(&args[0], &option)) | |
154 | return -EINVAL; | |
155 | busuid = option; | |
156 | break; | |
157 | case Opt_busgid: | |
158 | if (match_int(&args[0], &option)) | |
159 | return -EINVAL; | |
160 | busgid = option; | |
161 | break; | |
162 | case Opt_busmode: | |
163 | if (match_octal(&args[0], &option)) | |
164 | return -EINVAL; | |
165 | busmode = option & S_IRWXUGO; | |
166 | break; | |
167 | case Opt_listuid: | |
168 | if (match_int(&args[0], &option)) | |
169 | return -EINVAL; | |
170 | listuid = option; | |
171 | break; | |
172 | case Opt_listgid: | |
173 | if (match_int(&args[0], &option)) | |
174 | return -EINVAL; | |
175 | listgid = option; | |
176 | break; | |
177 | case Opt_listmode: | |
178 | if (match_octal(&args[0], &option)) | |
179 | return -EINVAL; | |
180 | listmode = option & S_IRWXUGO; | |
181 | break; | |
182 | default: | |
183 | err("usbfs: unrecognised mount option \"%s\" " | |
184 | "or missing value\n", p); | |
185 | return -EINVAL; | |
186 | } | |
187 | } | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | static void update_special(struct dentry *special) | |
193 | { | |
194 | special->d_inode->i_uid = listuid; | |
195 | special->d_inode->i_gid = listgid; | |
196 | special->d_inode->i_mode = S_IFREG | listmode; | |
197 | } | |
198 | ||
199 | static void update_dev(struct dentry *dev) | |
200 | { | |
201 | dev->d_inode->i_uid = devuid; | |
202 | dev->d_inode->i_gid = devgid; | |
203 | dev->d_inode->i_mode = S_IFREG | devmode; | |
204 | } | |
205 | ||
206 | static void update_bus(struct dentry *bus) | |
207 | { | |
208 | struct dentry *dev = NULL; | |
209 | ||
210 | bus->d_inode->i_uid = busuid; | |
211 | bus->d_inode->i_gid = busgid; | |
212 | bus->d_inode->i_mode = S_IFDIR | busmode; | |
213 | ||
1b1dcc1b | 214 | mutex_lock(&bus->d_inode->i_mutex); |
1da177e4 | 215 | |
5160ee6f | 216 | list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child) |
1da177e4 LT |
217 | if (dev->d_inode) |
218 | update_dev(dev); | |
219 | ||
1b1dcc1b | 220 | mutex_unlock(&bus->d_inode->i_mutex); |
1da177e4 LT |
221 | } |
222 | ||
223 | static void update_sb(struct super_block *sb) | |
224 | { | |
225 | struct dentry *root = sb->s_root; | |
226 | struct dentry *bus = NULL; | |
227 | ||
228 | if (!root) | |
229 | return; | |
230 | ||
f2eace23 | 231 | mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT); |
1da177e4 | 232 | |
5160ee6f | 233 | list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) { |
1da177e4 LT |
234 | if (bus->d_inode) { |
235 | switch (S_IFMT & bus->d_inode->i_mode) { | |
236 | case S_IFDIR: | |
237 | update_bus(bus); | |
238 | break; | |
239 | case S_IFREG: | |
240 | update_special(bus); | |
241 | break; | |
242 | default: | |
243 | warn("Unknown node %s mode %x found on remount!\n",bus->d_name.name,bus->d_inode->i_mode); | |
244 | break; | |
245 | } | |
246 | } | |
247 | } | |
248 | ||
1b1dcc1b | 249 | mutex_unlock(&root->d_inode->i_mutex); |
1da177e4 LT |
250 | } |
251 | ||
252 | static int remount(struct super_block *sb, int *flags, char *data) | |
253 | { | |
254 | /* If this is not a real mount, | |
255 | * i.e. it's a simple_pin_fs from create_special_files, | |
256 | * then ignore it. | |
257 | */ | |
258 | if (ignore_mount) | |
259 | return 0; | |
260 | ||
261 | if (parse_options(sb, data)) { | |
262 | warn("usbfs: mount parameter error:"); | |
263 | return -EINVAL; | |
264 | } | |
265 | ||
266 | if (usbfs_mount && usbfs_mount->mnt_sb) | |
267 | update_sb(usbfs_mount->mnt_sb); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev) | |
273 | { | |
274 | struct inode *inode = new_inode(sb); | |
275 | ||
276 | if (inode) { | |
277 | inode->i_mode = mode; | |
278 | inode->i_uid = current->fsuid; | |
279 | inode->i_gid = current->fsgid; | |
1da177e4 LT |
280 | inode->i_blocks = 0; |
281 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
282 | switch (mode & S_IFMT) { | |
283 | default: | |
284 | init_special_inode(inode, mode, dev); | |
285 | break; | |
286 | case S_IFREG: | |
287 | inode->i_fop = &default_file_operations; | |
288 | break; | |
289 | case S_IFDIR: | |
bc7cb323 | 290 | inode->i_op = &simple_dir_inode_operations; |
1da177e4 LT |
291 | inode->i_fop = &simple_dir_operations; |
292 | ||
293 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 294 | inc_nlink(inode); |
1da177e4 LT |
295 | break; |
296 | } | |
297 | } | |
298 | return inode; | |
299 | } | |
300 | ||
301 | /* SMP-safe */ | |
302 | static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode, | |
303 | dev_t dev) | |
304 | { | |
305 | struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev); | |
306 | int error = -EPERM; | |
307 | ||
308 | if (dentry->d_inode) | |
309 | return -EEXIST; | |
310 | ||
311 | if (inode) { | |
312 | d_instantiate(dentry, inode); | |
313 | dget(dentry); | |
314 | error = 0; | |
315 | } | |
316 | return error; | |
317 | } | |
318 | ||
319 | static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode) | |
320 | { | |
321 | int res; | |
322 | ||
323 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
324 | res = usbfs_mknod (dir, dentry, mode, 0); | |
325 | if (!res) | |
d8c76e6f | 326 | inc_nlink(dir); |
1da177e4 LT |
327 | return res; |
328 | } | |
329 | ||
330 | static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode) | |
331 | { | |
332 | mode = (mode & S_IALLUGO) | S_IFREG; | |
333 | return usbfs_mknod (dir, dentry, mode, 0); | |
334 | } | |
335 | ||
336 | static inline int usbfs_positive (struct dentry *dentry) | |
337 | { | |
338 | return dentry->d_inode && !d_unhashed(dentry); | |
339 | } | |
340 | ||
341 | static int usbfs_empty (struct dentry *dentry) | |
342 | { | |
343 | struct list_head *list; | |
344 | ||
345 | spin_lock(&dcache_lock); | |
346 | ||
347 | list_for_each(list, &dentry->d_subdirs) { | |
5160ee6f | 348 | struct dentry *de = list_entry(list, struct dentry, d_u.d_child); |
1da177e4 LT |
349 | if (usbfs_positive(de)) { |
350 | spin_unlock(&dcache_lock); | |
351 | return 0; | |
352 | } | |
353 | } | |
354 | ||
355 | spin_unlock(&dcache_lock); | |
356 | return 1; | |
357 | } | |
358 | ||
359 | static int usbfs_unlink (struct inode *dir, struct dentry *dentry) | |
360 | { | |
361 | struct inode *inode = dentry->d_inode; | |
1b1dcc1b | 362 | mutex_lock(&inode->i_mutex); |
9a53c3a7 | 363 | drop_nlink(dentry->d_inode); |
1da177e4 | 364 | dput(dentry); |
1b1dcc1b | 365 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
366 | d_delete(dentry); |
367 | return 0; | |
368 | } | |
369 | ||
370 | static int usbfs_rmdir(struct inode *dir, struct dentry *dentry) | |
371 | { | |
372 | int error = -ENOTEMPTY; | |
373 | struct inode * inode = dentry->d_inode; | |
374 | ||
1b1dcc1b | 375 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
376 | dentry_unhash(dentry); |
377 | if (usbfs_empty(dentry)) { | |
9a53c3a7 DH |
378 | drop_nlink(dentry->d_inode); |
379 | drop_nlink(dentry->d_inode); | |
1da177e4 LT |
380 | dput(dentry); |
381 | inode->i_flags |= S_DEAD; | |
9a53c3a7 | 382 | drop_nlink(dir); |
1da177e4 LT |
383 | error = 0; |
384 | } | |
1b1dcc1b | 385 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
386 | if (!error) |
387 | d_delete(dentry); | |
388 | dput(dentry); | |
389 | return error; | |
390 | } | |
391 | ||
392 | ||
393 | /* default file operations */ | |
394 | static ssize_t default_read_file (struct file *file, char __user *buf, | |
395 | size_t count, loff_t *ppos) | |
396 | { | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static ssize_t default_write_file (struct file *file, const char __user *buf, | |
401 | size_t count, loff_t *ppos) | |
402 | { | |
403 | return count; | |
404 | } | |
405 | ||
406 | static loff_t default_file_lseek (struct file *file, loff_t offset, int orig) | |
407 | { | |
408 | loff_t retval = -EINVAL; | |
409 | ||
33cb8994 | 410 | mutex_lock(&file->f_path.dentry->d_inode->i_mutex); |
1da177e4 LT |
411 | switch(orig) { |
412 | case 0: | |
413 | if (offset > 0) { | |
414 | file->f_pos = offset; | |
415 | retval = file->f_pos; | |
416 | } | |
417 | break; | |
418 | case 1: | |
419 | if ((offset + file->f_pos) > 0) { | |
420 | file->f_pos += offset; | |
421 | retval = file->f_pos; | |
422 | } | |
423 | break; | |
424 | default: | |
425 | break; | |
426 | } | |
33cb8994 | 427 | mutex_unlock(&file->f_path.dentry->d_inode->i_mutex); |
1da177e4 LT |
428 | return retval; |
429 | } | |
430 | ||
431 | static int default_open (struct inode *inode, struct file *file) | |
432 | { | |
8e18e294 TT |
433 | if (inode->i_private) |
434 | file->private_data = inode->i_private; | |
1da177e4 LT |
435 | |
436 | return 0; | |
437 | } | |
438 | ||
066202dd | 439 | static const struct file_operations default_file_operations = { |
1da177e4 LT |
440 | .read = default_read_file, |
441 | .write = default_write_file, | |
442 | .open = default_open, | |
443 | .llseek = default_file_lseek, | |
444 | }; | |
445 | ||
1da177e4 LT |
446 | static struct super_operations usbfs_ops = { |
447 | .statfs = simple_statfs, | |
448 | .drop_inode = generic_delete_inode, | |
449 | .remount_fs = remount, | |
2e4f3c02 | 450 | .show_options = usbfs_show_options, |
1da177e4 LT |
451 | }; |
452 | ||
453 | static int usbfs_fill_super(struct super_block *sb, void *data, int silent) | |
454 | { | |
455 | struct inode *inode; | |
456 | struct dentry *root; | |
457 | ||
458 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
459 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
460 | sb->s_magic = USBDEVICE_SUPER_MAGIC; | |
461 | sb->s_op = &usbfs_ops; | |
462 | sb->s_time_gran = 1; | |
463 | inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0); | |
464 | ||
465 | if (!inode) { | |
441b62c1 | 466 | dbg("%s: could not get inode!",__func__); |
1da177e4 LT |
467 | return -ENOMEM; |
468 | } | |
469 | ||
470 | root = d_alloc_root(inode); | |
471 | if (!root) { | |
441b62c1 | 472 | dbg("%s: could not get root dentry!",__func__); |
1da177e4 LT |
473 | iput(inode); |
474 | return -ENOMEM; | |
475 | } | |
476 | sb->s_root = root; | |
477 | return 0; | |
478 | } | |
479 | ||
1da177e4 LT |
480 | /* |
481 | * fs_create_by_name - create a file, given a name | |
482 | * @name: name of file | |
483 | * @mode: type of file | |
484 | * @parent: dentry of directory to create it in | |
485 | * @dentry: resulting dentry of file | |
486 | * | |
487 | * This function handles both regular files and directories. | |
488 | */ | |
489 | static int fs_create_by_name (const char *name, mode_t mode, | |
490 | struct dentry *parent, struct dentry **dentry) | |
491 | { | |
492 | int error = 0; | |
493 | ||
494 | /* If the parent is not specified, we create it in the root. | |
495 | * We need the root dentry to do this, which is in the super | |
496 | * block. A pointer to that is in the struct vfsmount that we | |
497 | * have around. | |
498 | */ | |
499 | if (!parent ) { | |
500 | if (usbfs_mount && usbfs_mount->mnt_sb) { | |
501 | parent = usbfs_mount->mnt_sb->s_root; | |
502 | } | |
503 | } | |
504 | ||
505 | if (!parent) { | |
506 | dbg("Ah! can not find a parent!"); | |
507 | return -EFAULT; | |
508 | } | |
509 | ||
510 | *dentry = NULL; | |
1b1dcc1b | 511 | mutex_lock(&parent->d_inode->i_mutex); |
5f45f1a7 | 512 | *dentry = lookup_one_len(name, parent, strlen(name)); |
1da177e4 LT |
513 | if (!IS_ERR(dentry)) { |
514 | if ((mode & S_IFMT) == S_IFDIR) | |
515 | error = usbfs_mkdir (parent->d_inode, *dentry, mode); | |
516 | else | |
517 | error = usbfs_create (parent->d_inode, *dentry, mode); | |
518 | } else | |
519 | error = PTR_ERR(dentry); | |
1b1dcc1b | 520 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
521 | |
522 | return error; | |
523 | } | |
524 | ||
525 | static struct dentry *fs_create_file (const char *name, mode_t mode, | |
526 | struct dentry *parent, void *data, | |
066202dd | 527 | const struct file_operations *fops, |
1da177e4 LT |
528 | uid_t uid, gid_t gid) |
529 | { | |
530 | struct dentry *dentry; | |
531 | int error; | |
532 | ||
533 | dbg("creating file '%s'",name); | |
534 | ||
535 | error = fs_create_by_name (name, mode, parent, &dentry); | |
536 | if (error) { | |
537 | dentry = NULL; | |
538 | } else { | |
539 | if (dentry->d_inode) { | |
540 | if (data) | |
8e18e294 | 541 | dentry->d_inode->i_private = data; |
1da177e4 LT |
542 | if (fops) |
543 | dentry->d_inode->i_fop = fops; | |
544 | dentry->d_inode->i_uid = uid; | |
545 | dentry->d_inode->i_gid = gid; | |
546 | } | |
547 | } | |
548 | ||
549 | return dentry; | |
550 | } | |
551 | ||
552 | static void fs_remove_file (struct dentry *dentry) | |
553 | { | |
554 | struct dentry *parent = dentry->d_parent; | |
555 | ||
556 | if (!parent || !parent->d_inode) | |
557 | return; | |
558 | ||
8e7795ef | 559 | mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT); |
1da177e4 LT |
560 | if (usbfs_positive(dentry)) { |
561 | if (dentry->d_inode) { | |
562 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
563 | usbfs_rmdir(parent->d_inode, dentry); | |
564 | else | |
565 | usbfs_unlink(parent->d_inode, dentry); | |
566 | dput(dentry); | |
567 | } | |
568 | } | |
1b1dcc1b | 569 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
570 | } |
571 | ||
572 | /* --------------------------------------------------------------------- */ | |
573 | ||
454e2398 DH |
574 | static int usb_get_sb(struct file_system_type *fs_type, |
575 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 576 | { |
454e2398 | 577 | return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt); |
1da177e4 LT |
578 | } |
579 | ||
580 | static struct file_system_type usb_fs_type = { | |
581 | .owner = THIS_MODULE, | |
582 | .name = "usbfs", | |
583 | .get_sb = usb_get_sb, | |
584 | .kill_sb = kill_litter_super, | |
585 | }; | |
586 | ||
587 | /* --------------------------------------------------------------------- */ | |
588 | ||
589 | static int create_special_files (void) | |
590 | { | |
591 | struct dentry *parent; | |
592 | int retval; | |
593 | ||
594 | /* the simple_pin_fs calls will call remount with no options | |
595 | * without this flag that would overwrite the real mount options (if any) | |
596 | */ | |
597 | ignore_mount = 1; | |
598 | ||
599 | /* create the devices special file */ | |
1f5ce9e9 | 600 | retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count); |
1da177e4 LT |
601 | if (retval) { |
602 | err ("Unable to get usbfs mount"); | |
603 | goto exit; | |
604 | } | |
605 | ||
606 | ignore_mount = 0; | |
607 | ||
608 | parent = usbfs_mount->mnt_sb->s_root; | |
609 | devices_usbfs_dentry = fs_create_file ("devices", | |
610 | listmode | S_IFREG, parent, | |
611 | NULL, &usbfs_devices_fops, | |
612 | listuid, listgid); | |
613 | if (devices_usbfs_dentry == NULL) { | |
614 | err ("Unable to create devices usbfs file"); | |
615 | retval = -ENODEV; | |
616 | goto error_clean_mounts; | |
617 | } | |
618 | ||
619 | goto exit; | |
620 | ||
621 | error_clean_mounts: | |
622 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
623 | exit: | |
624 | return retval; | |
625 | } | |
626 | ||
627 | static void remove_special_files (void) | |
628 | { | |
629 | if (devices_usbfs_dentry) | |
630 | fs_remove_file (devices_usbfs_dentry); | |
631 | devices_usbfs_dentry = NULL; | |
632 | simple_release_fs(&usbfs_mount, &usbfs_mount_count); | |
633 | } | |
634 | ||
635 | void usbfs_update_special (void) | |
636 | { | |
637 | struct inode *inode; | |
638 | ||
639 | if (devices_usbfs_dentry) { | |
640 | inode = devices_usbfs_dentry->d_inode; | |
641 | if (inode) | |
642 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
643 | } | |
644 | } | |
645 | ||
54a5c4cd | 646 | static void usbfs_add_bus(struct usb_bus *bus) |
1da177e4 LT |
647 | { |
648 | struct dentry *parent; | |
649 | char name[8]; | |
650 | int retval; | |
651 | ||
652 | /* create the special files if this is the first bus added */ | |
653 | if (num_buses == 0) { | |
654 | retval = create_special_files(); | |
655 | if (retval) | |
656 | return; | |
657 | } | |
658 | ++num_buses; | |
659 | ||
660 | sprintf (name, "%03d", bus->busnum); | |
661 | ||
662 | parent = usbfs_mount->mnt_sb->s_root; | |
663 | bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent, | |
664 | bus, NULL, busuid, busgid); | |
665 | if (bus->usbfs_dentry == NULL) { | |
666 | err ("error creating usbfs bus entry"); | |
667 | return; | |
668 | } | |
1da177e4 LT |
669 | } |
670 | ||
54a5c4cd | 671 | static void usbfs_remove_bus(struct usb_bus *bus) |
1da177e4 LT |
672 | { |
673 | if (bus->usbfs_dentry) { | |
674 | fs_remove_file (bus->usbfs_dentry); | |
675 | bus->usbfs_dentry = NULL; | |
676 | } | |
677 | ||
678 | --num_buses; | |
679 | if (num_buses <= 0) { | |
680 | remove_special_files(); | |
681 | num_buses = 0; | |
682 | } | |
1da177e4 LT |
683 | } |
684 | ||
54a5c4cd | 685 | static void usbfs_add_device(struct usb_device *dev) |
1da177e4 LT |
686 | { |
687 | char name[8]; | |
688 | int i; | |
689 | int i_size; | |
690 | ||
691 | sprintf (name, "%03d", dev->devnum); | |
692 | dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG, | |
693 | dev->bus->usbfs_dentry, dev, | |
9f8b17e6 | 694 | &usbdev_file_operations, |
1da177e4 LT |
695 | devuid, devgid); |
696 | if (dev->usbfs_dentry == NULL) { | |
697 | err ("error creating usbfs device entry"); | |
698 | return; | |
699 | } | |
700 | ||
701 | /* Set the size of the device's file to be | |
702 | * equal to the size of the device descriptors. */ | |
703 | i_size = sizeof (struct usb_device_descriptor); | |
704 | for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) { | |
705 | struct usb_config_descriptor *config = | |
706 | (struct usb_config_descriptor *)dev->rawdescriptors[i]; | |
707 | i_size += le16_to_cpu(config->wTotalLength); | |
708 | } | |
709 | if (dev->usbfs_dentry->d_inode) | |
710 | dev->usbfs_dentry->d_inode->i_size = i_size; | |
1da177e4 LT |
711 | } |
712 | ||
54a5c4cd | 713 | static void usbfs_remove_device(struct usb_device *dev) |
1da177e4 | 714 | { |
1da177e4 LT |
715 | if (dev->usbfs_dentry) { |
716 | fs_remove_file (dev->usbfs_dentry); | |
717 | dev->usbfs_dentry = NULL; | |
718 | } | |
cd9f0375 | 719 | usb_fs_classdev_common_remove(dev); |
54a5c4cd GKH |
720 | } |
721 | ||
722 | static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev) | |
723 | { | |
724 | switch (action) { | |
725 | case USB_DEVICE_ADD: | |
726 | usbfs_add_device(dev); | |
727 | break; | |
728 | case USB_DEVICE_REMOVE: | |
729 | usbfs_remove_device(dev); | |
730 | break; | |
731 | case USB_BUS_ADD: | |
732 | usbfs_add_bus(dev); | |
733 | break; | |
734 | case USB_BUS_REMOVE: | |
735 | usbfs_remove_bus(dev); | |
736 | } | |
737 | ||
1da177e4 LT |
738 | usbfs_update_special(); |
739 | usbfs_conn_disc_event(); | |
54a5c4cd | 740 | return NOTIFY_OK; |
1da177e4 LT |
741 | } |
742 | ||
54a5c4cd GKH |
743 | static struct notifier_block usbfs_nb = { |
744 | .notifier_call = usbfs_notify, | |
745 | }; | |
746 | ||
1da177e4 LT |
747 | /* --------------------------------------------------------------------- */ |
748 | ||
749 | static struct proc_dir_entry *usbdir = NULL; | |
750 | ||
751 | int __init usbfs_init(void) | |
752 | { | |
753 | int retval; | |
754 | ||
1da177e4 | 755 | retval = register_filesystem(&usb_fs_type); |
fbf82fd2 | 756 | if (retval) |
1da177e4 | 757 | return retval; |
1da177e4 | 758 | |
54a5c4cd GKH |
759 | usb_register_notify(&usbfs_nb); |
760 | ||
1da177e4 | 761 | /* create mount point for usbfs */ |
9c37066d | 762 | usbdir = proc_mkdir("bus/usb", NULL); |
1da177e4 LT |
763 | |
764 | return 0; | |
765 | } | |
766 | ||
767 | void usbfs_cleanup(void) | |
768 | { | |
54a5c4cd | 769 | usb_unregister_notify(&usbfs_nb); |
1da177e4 LT |
770 | unregister_filesystem(&usb_fs_type); |
771 | if (usbdir) | |
9c37066d | 772 | remove_proc_entry("bus/usb", NULL); |
1da177e4 LT |
773 | } |
774 |