Commit | Line | Data |
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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> |
27729aad | 42 | #include <linux/usb/hcd.h> |
1da177e4 LT |
43 | #include <asm/byteorder.h> |
44 | #include "usb.h" | |
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 | ||
066202dd | 50 | static const struct file_operations default_file_operations; |
1da177e4 LT |
51 | static struct vfsmount *usbfs_mount; |
52 | static int usbfs_mount_count; /* = 0 */ | |
53 | static int ignore_mount = 0; | |
54 | ||
55 | static struct dentry *devices_usbfs_dentry; | |
56 | static int num_buses; /* = 0 */ | |
57 | ||
58 | static uid_t devuid; /* = 0 */ | |
59 | static uid_t busuid; /* = 0 */ | |
60 | static uid_t listuid; /* = 0 */ | |
61 | static gid_t devgid; /* = 0 */ | |
62 | static gid_t busgid; /* = 0 */ | |
63 | static gid_t listgid; /* = 0 */ | |
2e4f3c02 MS |
64 | static umode_t devmode = USBFS_DEFAULT_DEVMODE; |
65 | static umode_t busmode = USBFS_DEFAULT_BUSMODE; | |
66 | static umode_t listmode = USBFS_DEFAULT_LISTMODE; | |
67 | ||
34c80b1d | 68 | static int usbfs_show_options(struct seq_file *seq, struct dentry *root) |
2e4f3c02 MS |
69 | { |
70 | if (devuid != 0) | |
71 | seq_printf(seq, ",devuid=%u", devuid); | |
72 | if (devgid != 0) | |
73 | seq_printf(seq, ",devgid=%u", devgid); | |
74 | if (devmode != USBFS_DEFAULT_DEVMODE) | |
75 | seq_printf(seq, ",devmode=%o", devmode); | |
76 | if (busuid != 0) | |
77 | seq_printf(seq, ",busuid=%u", busuid); | |
78 | if (busgid != 0) | |
79 | seq_printf(seq, ",busgid=%u", busgid); | |
80 | if (busmode != USBFS_DEFAULT_BUSMODE) | |
81 | seq_printf(seq, ",busmode=%o", busmode); | |
82 | if (listuid != 0) | |
83 | seq_printf(seq, ",listuid=%u", listuid); | |
84 | if (listgid != 0) | |
85 | seq_printf(seq, ",listgid=%u", listgid); | |
86 | if (listmode != USBFS_DEFAULT_LISTMODE) | |
87 | seq_printf(seq, ",listmode=%o", listmode); | |
88 | ||
89 | return 0; | |
90 | } | |
1da177e4 LT |
91 | |
92 | enum { | |
93 | Opt_devuid, Opt_devgid, Opt_devmode, | |
94 | Opt_busuid, Opt_busgid, Opt_busmode, | |
95 | Opt_listuid, Opt_listgid, Opt_listmode, | |
96 | Opt_err, | |
97 | }; | |
98 | ||
a447c093 | 99 | static const match_table_t tokens = { |
1da177e4 LT |
100 | {Opt_devuid, "devuid=%u"}, |
101 | {Opt_devgid, "devgid=%u"}, | |
102 | {Opt_devmode, "devmode=%o"}, | |
103 | {Opt_busuid, "busuid=%u"}, | |
104 | {Opt_busgid, "busgid=%u"}, | |
105 | {Opt_busmode, "busmode=%o"}, | |
106 | {Opt_listuid, "listuid=%u"}, | |
107 | {Opt_listgid, "listgid=%u"}, | |
108 | {Opt_listmode, "listmode=%o"}, | |
109 | {Opt_err, NULL} | |
110 | }; | |
111 | ||
112 | static int parse_options(struct super_block *s, char *data) | |
113 | { | |
114 | char *p; | |
115 | int option; | |
116 | ||
117 | /* (re)set to defaults. */ | |
118 | devuid = 0; | |
119 | busuid = 0; | |
120 | listuid = 0; | |
121 | devgid = 0; | |
122 | busgid = 0; | |
123 | listgid = 0; | |
2e4f3c02 MS |
124 | devmode = USBFS_DEFAULT_DEVMODE; |
125 | busmode = USBFS_DEFAULT_BUSMODE; | |
126 | listmode = USBFS_DEFAULT_LISTMODE; | |
1da177e4 LT |
127 | |
128 | while ((p = strsep(&data, ",")) != NULL) { | |
129 | substring_t args[MAX_OPT_ARGS]; | |
130 | int token; | |
131 | if (!*p) | |
132 | continue; | |
133 | ||
134 | token = match_token(p, tokens, args); | |
135 | switch (token) { | |
136 | case Opt_devuid: | |
137 | if (match_int(&args[0], &option)) | |
138 | return -EINVAL; | |
139 | devuid = option; | |
140 | break; | |
141 | case Opt_devgid: | |
142 | if (match_int(&args[0], &option)) | |
143 | return -EINVAL; | |
144 | devgid = option; | |
145 | break; | |
146 | case Opt_devmode: | |
147 | if (match_octal(&args[0], &option)) | |
148 | return -EINVAL; | |
149 | devmode = option & S_IRWXUGO; | |
150 | break; | |
151 | case Opt_busuid: | |
152 | if (match_int(&args[0], &option)) | |
153 | return -EINVAL; | |
154 | busuid = option; | |
155 | break; | |
156 | case Opt_busgid: | |
157 | if (match_int(&args[0], &option)) | |
158 | return -EINVAL; | |
159 | busgid = option; | |
160 | break; | |
161 | case Opt_busmode: | |
162 | if (match_octal(&args[0], &option)) | |
163 | return -EINVAL; | |
164 | busmode = option & S_IRWXUGO; | |
165 | break; | |
166 | case Opt_listuid: | |
167 | if (match_int(&args[0], &option)) | |
168 | return -EINVAL; | |
169 | listuid = option; | |
170 | break; | |
171 | case Opt_listgid: | |
172 | if (match_int(&args[0], &option)) | |
173 | return -EINVAL; | |
174 | listgid = option; | |
175 | break; | |
176 | case Opt_listmode: | |
177 | if (match_octal(&args[0], &option)) | |
178 | return -EINVAL; | |
179 | listmode = option & S_IRWXUGO; | |
180 | break; | |
181 | default: | |
69a85942 GKH |
182 | printk(KERN_ERR "usbfs: unrecognised mount option " |
183 | "\"%s\" or missing value\n", p); | |
1da177e4 LT |
184 | return -EINVAL; |
185 | } | |
186 | } | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static void update_special(struct dentry *special) | |
192 | { | |
193 | special->d_inode->i_uid = listuid; | |
194 | special->d_inode->i_gid = listgid; | |
195 | special->d_inode->i_mode = S_IFREG | listmode; | |
196 | } | |
197 | ||
198 | static void update_dev(struct dentry *dev) | |
199 | { | |
200 | dev->d_inode->i_uid = devuid; | |
201 | dev->d_inode->i_gid = devgid; | |
202 | dev->d_inode->i_mode = S_IFREG | devmode; | |
203 | } | |
204 | ||
205 | static void update_bus(struct dentry *bus) | |
206 | { | |
207 | struct dentry *dev = NULL; | |
208 | ||
209 | bus->d_inode->i_uid = busuid; | |
210 | bus->d_inode->i_gid = busgid; | |
211 | bus->d_inode->i_mode = S_IFDIR | busmode; | |
212 | ||
1b1dcc1b | 213 | mutex_lock(&bus->d_inode->i_mutex); |
1da177e4 | 214 | |
5160ee6f | 215 | list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child) |
1da177e4 LT |
216 | if (dev->d_inode) |
217 | update_dev(dev); | |
218 | ||
1b1dcc1b | 219 | mutex_unlock(&bus->d_inode->i_mutex); |
1da177e4 LT |
220 | } |
221 | ||
222 | static void update_sb(struct super_block *sb) | |
223 | { | |
224 | struct dentry *root = sb->s_root; | |
225 | struct dentry *bus = NULL; | |
226 | ||
227 | if (!root) | |
228 | return; | |
229 | ||
f2eace23 | 230 | mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT); |
1da177e4 | 231 | |
5160ee6f | 232 | list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) { |
1da177e4 LT |
233 | if (bus->d_inode) { |
234 | switch (S_IFMT & bus->d_inode->i_mode) { | |
235 | case S_IFDIR: | |
236 | update_bus(bus); | |
237 | break; | |
238 | case S_IFREG: | |
239 | update_special(bus); | |
240 | break; | |
241 | default: | |
3b6004f3 GKH |
242 | printk(KERN_WARNING "usbfs: Unknown node %s " |
243 | "mode %x found on remount!\n", | |
244 | bus->d_name.name, bus->d_inode->i_mode); | |
1da177e4 LT |
245 | break; |
246 | } | |
247 | } | |
248 | } | |
249 | ||
1b1dcc1b | 250 | mutex_unlock(&root->d_inode->i_mutex); |
1da177e4 LT |
251 | } |
252 | ||
253 | static int remount(struct super_block *sb, int *flags, char *data) | |
254 | { | |
255 | /* If this is not a real mount, | |
256 | * i.e. it's a simple_pin_fs from create_special_files, | |
257 | * then ignore it. | |
258 | */ | |
259 | if (ignore_mount) | |
260 | return 0; | |
261 | ||
262 | if (parse_options(sb, data)) { | |
3b6004f3 | 263 | printk(KERN_WARNING "usbfs: mount parameter error.\n"); |
1da177e4 LT |
264 | return -EINVAL; |
265 | } | |
266 | ||
c972b4bc | 267 | if (usbfs_mount) |
1da177e4 LT |
268 | update_sb(usbfs_mount->mnt_sb); |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
5b91aca0 | 273 | static struct inode *usbfs_get_inode (struct super_block *sb, umode_t mode, dev_t dev) |
1da177e4 LT |
274 | { |
275 | struct inode *inode = new_inode(sb); | |
276 | ||
277 | if (inode) { | |
85fe4025 | 278 | inode->i_ino = get_next_ino(); |
5b91aca0 | 279 | inode_init_owner(inode, NULL, mode); |
1da177e4 LT |
280 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
281 | switch (mode & S_IFMT) { | |
282 | default: | |
283 | init_special_inode(inode, mode, dev); | |
284 | break; | |
285 | case S_IFREG: | |
286 | inode->i_fop = &default_file_operations; | |
287 | break; | |
288 | case S_IFDIR: | |
bc7cb323 | 289 | inode->i_op = &simple_dir_inode_operations; |
1da177e4 LT |
290 | inode->i_fop = &simple_dir_operations; |
291 | ||
292 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
d8c76e6f | 293 | inc_nlink(inode); |
1da177e4 LT |
294 | break; |
295 | } | |
296 | } | |
297 | return inode; | |
298 | } | |
299 | ||
300 | /* SMP-safe */ | |
5b91aca0 | 301 | static int usbfs_mknod (struct inode *dir, struct dentry *dentry, umode_t mode, |
1da177e4 LT |
302 | dev_t dev) |
303 | { | |
304 | struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev); | |
305 | int error = -EPERM; | |
306 | ||
307 | if (dentry->d_inode) | |
308 | return -EEXIST; | |
309 | ||
310 | if (inode) { | |
311 | d_instantiate(dentry, inode); | |
312 | dget(dentry); | |
313 | error = 0; | |
314 | } | |
315 | return error; | |
316 | } | |
317 | ||
5b91aca0 | 318 | static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
319 | { |
320 | int res; | |
321 | ||
322 | mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR; | |
323 | res = usbfs_mknod (dir, dentry, mode, 0); | |
324 | if (!res) | |
d8c76e6f | 325 | inc_nlink(dir); |
1da177e4 LT |
326 | return res; |
327 | } | |
328 | ||
5b91aca0 | 329 | static int usbfs_create (struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
330 | { |
331 | mode = (mode & S_IALLUGO) | S_IFREG; | |
332 | return usbfs_mknod (dir, dentry, mode, 0); | |
333 | } | |
334 | ||
335 | static inline int usbfs_positive (struct dentry *dentry) | |
336 | { | |
337 | return dentry->d_inode && !d_unhashed(dentry); | |
338 | } | |
339 | ||
340 | static int usbfs_empty (struct dentry *dentry) | |
341 | { | |
342 | struct list_head *list; | |
343 | ||
2fd6b7f5 | 344 | spin_lock(&dentry->d_lock); |
1da177e4 | 345 | list_for_each(list, &dentry->d_subdirs) { |
5160ee6f | 346 | struct dentry *de = list_entry(list, struct dentry, d_u.d_child); |
2fd6b7f5 NP |
347 | |
348 | spin_lock_nested(&de->d_lock, DENTRY_D_LOCK_NESTED); | |
1da177e4 | 349 | if (usbfs_positive(de)) { |
da502956 | 350 | spin_unlock(&de->d_lock); |
2fd6b7f5 | 351 | spin_unlock(&dentry->d_lock); |
1da177e4 LT |
352 | return 0; |
353 | } | |
da502956 | 354 | spin_unlock(&de->d_lock); |
1da177e4 | 355 | } |
2fd6b7f5 | 356 | spin_unlock(&dentry->d_lock); |
1da177e4 LT |
357 | return 1; |
358 | } | |
359 | ||
360 | static int usbfs_unlink (struct inode *dir, struct dentry *dentry) | |
361 | { | |
362 | struct inode *inode = dentry->d_inode; | |
1b1dcc1b | 363 | mutex_lock(&inode->i_mutex); |
9a53c3a7 | 364 | drop_nlink(dentry->d_inode); |
1da177e4 | 365 | dput(dentry); |
1b1dcc1b | 366 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
367 | d_delete(dentry); |
368 | return 0; | |
369 | } | |
370 | ||
371 | static int usbfs_rmdir(struct inode *dir, struct dentry *dentry) | |
372 | { | |
373 | int error = -ENOTEMPTY; | |
374 | struct inode * inode = dentry->d_inode; | |
375 | ||
1b1dcc1b | 376 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
377 | dentry_unhash(dentry); |
378 | if (usbfs_empty(dentry)) { | |
d83c49f3 | 379 | dont_mount(dentry); |
9a53c3a7 DH |
380 | drop_nlink(dentry->d_inode); |
381 | drop_nlink(dentry->d_inode); | |
1da177e4 LT |
382 | dput(dentry); |
383 | inode->i_flags |= S_DEAD; | |
9a53c3a7 | 384 | drop_nlink(dir); |
1da177e4 LT |
385 | error = 0; |
386 | } | |
1b1dcc1b | 387 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
388 | if (!error) |
389 | d_delete(dentry); | |
1da177e4 LT |
390 | return error; |
391 | } | |
392 | ||
393 | ||
394 | /* default file operations */ | |
395 | static ssize_t default_read_file (struct file *file, char __user *buf, | |
396 | size_t count, loff_t *ppos) | |
397 | { | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static ssize_t default_write_file (struct file *file, const char __user *buf, | |
402 | size_t count, loff_t *ppos) | |
403 | { | |
404 | return count; | |
405 | } | |
406 | ||
407 | static loff_t default_file_lseek (struct file *file, loff_t offset, int orig) | |
408 | { | |
409 | loff_t retval = -EINVAL; | |
410 | ||
33cb8994 | 411 | mutex_lock(&file->f_path.dentry->d_inode->i_mutex); |
1da177e4 LT |
412 | switch(orig) { |
413 | case 0: | |
414 | if (offset > 0) { | |
415 | file->f_pos = offset; | |
416 | retval = file->f_pos; | |
417 | } | |
418 | break; | |
419 | case 1: | |
420 | if ((offset + file->f_pos) > 0) { | |
421 | file->f_pos += offset; | |
422 | retval = file->f_pos; | |
423 | } | |
424 | break; | |
425 | default: | |
426 | break; | |
427 | } | |
33cb8994 | 428 | mutex_unlock(&file->f_path.dentry->d_inode->i_mutex); |
1da177e4 LT |
429 | return retval; |
430 | } | |
431 | ||
432 | static int default_open (struct inode *inode, struct file *file) | |
433 | { | |
8e18e294 TT |
434 | if (inode->i_private) |
435 | file->private_data = inode->i_private; | |
1da177e4 LT |
436 | |
437 | return 0; | |
438 | } | |
439 | ||
066202dd | 440 | static const struct file_operations default_file_operations = { |
1da177e4 LT |
441 | .read = default_read_file, |
442 | .write = default_write_file, | |
443 | .open = default_open, | |
444 | .llseek = default_file_lseek, | |
445 | }; | |
446 | ||
b87221de | 447 | static const struct super_operations usbfs_ops = { |
1da177e4 LT |
448 | .statfs = simple_statfs, |
449 | .drop_inode = generic_delete_inode, | |
450 | .remount_fs = remount, | |
2e4f3c02 | 451 | .show_options = usbfs_show_options, |
1da177e4 LT |
452 | }; |
453 | ||
454 | static int usbfs_fill_super(struct super_block *sb, void *data, int silent) | |
455 | { | |
456 | struct inode *inode; | |
457 | struct dentry *root; | |
458 | ||
459 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
460 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
461 | sb->s_magic = USBDEVICE_SUPER_MAGIC; | |
462 | sb->s_op = &usbfs_ops; | |
463 | sb->s_time_gran = 1; | |
464 | inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0); | |
465 | ||
466 | if (!inode) { | |
441b62c1 | 467 | dbg("%s: could not get inode!",__func__); |
1da177e4 LT |
468 | return -ENOMEM; |
469 | } | |
470 | ||
471 | root = d_alloc_root(inode); | |
472 | if (!root) { | |
441b62c1 | 473 | dbg("%s: could not get root dentry!",__func__); |
1da177e4 LT |
474 | iput(inode); |
475 | return -ENOMEM; | |
476 | } | |
477 | sb->s_root = root; | |
478 | return 0; | |
479 | } | |
480 | ||
1da177e4 LT |
481 | /* |
482 | * fs_create_by_name - create a file, given a name | |
483 | * @name: name of file | |
484 | * @mode: type of file | |
485 | * @parent: dentry of directory to create it in | |
486 | * @dentry: resulting dentry of file | |
487 | * | |
488 | * This function handles both regular files and directories. | |
489 | */ | |
5b91aca0 | 490 | static int fs_create_by_name (const char *name, umode_t mode, |
1da177e4 LT |
491 | struct dentry *parent, struct dentry **dentry) |
492 | { | |
493 | int error = 0; | |
494 | ||
495 | /* If the parent is not specified, we create it in the root. | |
496 | * We need the root dentry to do this, which is in the super | |
497 | * block. A pointer to that is in the struct vfsmount that we | |
498 | * have around. | |
499 | */ | |
500 | if (!parent ) { | |
c972b4bc | 501 | if (usbfs_mount) |
4c1d5a64 | 502 | parent = usbfs_mount->mnt_root; |
1da177e4 LT |
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)); |
fa7fe7af | 513 | if (!IS_ERR(*dentry)) { |
5b91aca0 | 514 | if (S_ISDIR(mode)) |
1da177e4 LT |
515 | error = usbfs_mkdir (parent->d_inode, *dentry, mode); |
516 | else | |
517 | error = usbfs_create (parent->d_inode, *dentry, mode); | |
518 | } else | |
fa7fe7af | 519 | error = PTR_ERR(*dentry); |
1b1dcc1b | 520 | mutex_unlock(&parent->d_inode->i_mutex); |
1da177e4 LT |
521 | |
522 | return error; | |
523 | } | |
524 | ||
5b91aca0 | 525 | static struct dentry *fs_create_file (const char *name, umode_t mode, |
1da177e4 | 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 | ||
fc14f2fe AV |
574 | static struct dentry *usb_mount(struct file_system_type *fs_type, |
575 | int flags, const char *dev_name, void *data) | |
1da177e4 | 576 | { |
fc14f2fe | 577 | return mount_single(fs_type, flags, data, usbfs_fill_super); |
1da177e4 LT |
578 | } |
579 | ||
580 | static struct file_system_type usb_fs_type = { | |
581 | .owner = THIS_MODULE, | |
582 | .name = "usbfs", | |
fc14f2fe | 583 | .mount = usb_mount, |
1da177e4 LT |
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 | 601 | if (retval) { |
69a85942 | 602 | printk(KERN_ERR "Unable to get usbfs mount\n"); |
1da177e4 LT |
603 | goto exit; |
604 | } | |
605 | ||
606 | ignore_mount = 0; | |
607 | ||
4c1d5a64 | 608 | parent = usbfs_mount->mnt_root; |
1da177e4 LT |
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) { | |
69a85942 | 614 | printk(KERN_ERR "Unable to create devices usbfs file\n"); |
1da177e4 LT |
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 | ||
4c1d5a64 | 662 | parent = usbfs_mount->mnt_root; |
1da177e4 LT |
663 | bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent, |
664 | bus, NULL, busuid, busgid); | |
665 | if (bus->usbfs_dentry == NULL) { | |
69a85942 | 666 | printk(KERN_ERR "Error creating usbfs bus entry\n"); |
1da177e4 LT |
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) { | |
69a85942 | 697 | printk(KERN_ERR "Error creating usbfs device entry\n"); |
1da177e4 LT |
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 | } | |
54a5c4cd GKH |
719 | } |
720 | ||
721 | static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev) | |
722 | { | |
723 | switch (action) { | |
724 | case USB_DEVICE_ADD: | |
725 | usbfs_add_device(dev); | |
726 | break; | |
727 | case USB_DEVICE_REMOVE: | |
728 | usbfs_remove_device(dev); | |
729 | break; | |
730 | case USB_BUS_ADD: | |
731 | usbfs_add_bus(dev); | |
732 | break; | |
733 | case USB_BUS_REMOVE: | |
734 | usbfs_remove_bus(dev); | |
735 | } | |
736 | ||
1da177e4 LT |
737 | usbfs_update_special(); |
738 | usbfs_conn_disc_event(); | |
54a5c4cd | 739 | return NOTIFY_OK; |
1da177e4 LT |
740 | } |
741 | ||
54a5c4cd GKH |
742 | static struct notifier_block usbfs_nb = { |
743 | .notifier_call = usbfs_notify, | |
744 | }; | |
745 | ||
1da177e4 LT |
746 | /* --------------------------------------------------------------------- */ |
747 | ||
748 | static struct proc_dir_entry *usbdir = NULL; | |
749 | ||
750 | int __init usbfs_init(void) | |
751 | { | |
752 | int retval; | |
753 | ||
1da177e4 | 754 | retval = register_filesystem(&usb_fs_type); |
fbf82fd2 | 755 | if (retval) |
1da177e4 | 756 | return retval; |
1da177e4 | 757 | |
54a5c4cd GKH |
758 | usb_register_notify(&usbfs_nb); |
759 | ||
1da177e4 | 760 | /* create mount point for usbfs */ |
9c37066d | 761 | usbdir = proc_mkdir("bus/usb", NULL); |
1da177e4 LT |
762 | |
763 | return 0; | |
764 | } | |
765 | ||
766 | void usbfs_cleanup(void) | |
767 | { | |
54a5c4cd | 768 | usb_unregister_notify(&usbfs_nb); |
1da177e4 LT |
769 | unregister_filesystem(&usb_fs_type); |
770 | if (usbdir) | |
9c37066d | 771 | remove_proc_entry("bus/usb", NULL); |
1da177e4 LT |
772 | } |
773 |