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conn reset on neighbor stall, neighbor free
[cor_2_6_31.git] / drivers / usb / core / inode.c
blobffe75e83787c2216c7655dcb81abc51b7e52ccbb
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/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/parser.h>
40 #include <linux/notifier.h>
41 #include <linux/seq_file.h>
42 #include <linux/smp_lock.h>
43 #include <asm/byteorder.h>
44 #include "usb.h"
45 #include "hcd.h"
46
47 #define USBFS_DEFAULT_DEVMODE (S_IWUSR | S_IRUGO)
48 #define USBFS_DEFAULT_BUSMODE (S_IXUGO | S_IRUGO)
49 #define USBFS_DEFAULT_LISTMODE S_IRUGO
50
51 static struct super_operations usbfs_ops;
52 static const struct file_operations default_file_operations;
53 static struct vfsmount *usbfs_mount;
54 static int usbfs_mount_count; /* = 0 */
55 static int ignore_mount = 0;
56
57 static struct dentry *devices_usbfs_dentry;
58 static int num_buses; /* = 0 */
59
60 static uid_t devuid; /* = 0 */
61 static uid_t busuid; /* = 0 */
62 static uid_t listuid; /* = 0 */
63 static gid_t devgid; /* = 0 */
64 static gid_t busgid; /* = 0 */
65 static gid_t listgid; /* = 0 */
66 static umode_t devmode = USBFS_DEFAULT_DEVMODE;
67 static umode_t busmode = USBFS_DEFAULT_BUSMODE;
68 static umode_t listmode = USBFS_DEFAULT_LISTMODE;
69
70 static int usbfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
71 {
72 if (devuid != 0)
73 seq_printf(seq, ",devuid=%u", devuid);
74 if (devgid != 0)
75 seq_printf(seq, ",devgid=%u", devgid);
76 if (devmode != USBFS_DEFAULT_DEVMODE)
77 seq_printf(seq, ",devmode=%o", devmode);
78 if (busuid != 0)
79 seq_printf(seq, ",busuid=%u", busuid);
80 if (busgid != 0)
81 seq_printf(seq, ",busgid=%u", busgid);
82 if (busmode != USBFS_DEFAULT_BUSMODE)
83 seq_printf(seq, ",busmode=%o", busmode);
84 if (listuid != 0)
85 seq_printf(seq, ",listuid=%u", listuid);
86 if (listgid != 0)
87 seq_printf(seq, ",listgid=%u", listgid);
88 if (listmode != USBFS_DEFAULT_LISTMODE)
89 seq_printf(seq, ",listmode=%o", listmode);
90
91 return 0;
92 }
93
94 enum {
95 Opt_devuid, Opt_devgid, Opt_devmode,
96 Opt_busuid, Opt_busgid, Opt_busmode,
97 Opt_listuid, Opt_listgid, Opt_listmode,
98 Opt_err,
99 };
100
101 static const match_table_t tokens = {
102 {Opt_devuid, "devuid=%u"},
103 {Opt_devgid, "devgid=%u"},
104 {Opt_devmode, "devmode=%o"},
105 {Opt_busuid, "busuid=%u"},
106 {Opt_busgid, "busgid=%u"},
107 {Opt_busmode, "busmode=%o"},
108 {Opt_listuid, "listuid=%u"},
109 {Opt_listgid, "listgid=%u"},
110 {Opt_listmode, "listmode=%o"},
111 {Opt_err, NULL}
112 };
113
114 static int parse_options(struct super_block *s, char *data)
115 {
116 char *p;
117 int option;
118
119 /* (re)set to defaults. */
120 devuid = 0;
121 busuid = 0;
122 listuid = 0;
123 devgid = 0;
124 busgid = 0;
125 listgid = 0;
126 devmode = USBFS_DEFAULT_DEVMODE;
127 busmode = USBFS_DEFAULT_BUSMODE;
128 listmode = USBFS_DEFAULT_LISTMODE;
129
130 while ((p = strsep(&data, ",")) != NULL) {
131 substring_t args[MAX_OPT_ARGS];
132 int token;
133 if (!*p)
134 continue;
135
136 token = match_token(p, tokens, args);
137 switch (token) {
138 case Opt_devuid:
139 if (match_int(&args[0], &option))
140 return -EINVAL;
141 devuid = option;
142 break;
143 case Opt_devgid:
144 if (match_int(&args[0], &option))
145 return -EINVAL;
146 devgid = option;
147 break;
148 case Opt_devmode:
149 if (match_octal(&args[0], &option))
150 return -EINVAL;
151 devmode = option & S_IRWXUGO;
152 break;
153 case Opt_busuid:
154 if (match_int(&args[0], &option))
155 return -EINVAL;
156 busuid = option;
157 break;
158 case Opt_busgid:
159 if (match_int(&args[0], &option))
160 return -EINVAL;
161 busgid = option;
162 break;
163 case Opt_busmode:
164 if (match_octal(&args[0], &option))
165 return -EINVAL;
166 busmode = option & S_IRWXUGO;
167 break;
168 case Opt_listuid:
169 if (match_int(&args[0], &option))
170 return -EINVAL;
171 listuid = option;
172 break;
173 case Opt_listgid:
174 if (match_int(&args[0], &option))
175 return -EINVAL;
176 listgid = option;
177 break;
178 case Opt_listmode:
179 if (match_octal(&args[0], &option))
180 return -EINVAL;
181 listmode = option & S_IRWXUGO;
182 break;
183 default:
184 printk(KERN_ERR "usbfs: unrecognised mount option "
185 "\"%s\" or missing value\n", p);
186 return -EINVAL;
187 }
188 }
189
190 return 0;
191 }
192
193 static void update_special(struct dentry *special)
194 {
195 special->d_inode->i_uid = listuid;
196 special->d_inode->i_gid = listgid;
197 special->d_inode->i_mode = S_IFREG | listmode;
198 }
199
200 static void update_dev(struct dentry *dev)
201 {
202 dev->d_inode->i_uid = devuid;
203 dev->d_inode->i_gid = devgid;
204 dev->d_inode->i_mode = S_IFREG | devmode;
205 }
206
207 static void update_bus(struct dentry *bus)
208 {
209 struct dentry *dev = NULL;
210
211 bus->d_inode->i_uid = busuid;
212 bus->d_inode->i_gid = busgid;
213 bus->d_inode->i_mode = S_IFDIR | busmode;
214
215 mutex_lock(&bus->d_inode->i_mutex);
216
217 list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
218 if (dev->d_inode)
219 update_dev(dev);
220
221 mutex_unlock(&bus->d_inode->i_mutex);
222 }
223
224 static void update_sb(struct super_block *sb)
225 {
226 struct dentry *root = sb->s_root;
227 struct dentry *bus = NULL;
228
229 if (!root)
230 return;
231
232 mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
233
234 list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
235 if (bus->d_inode) {
236 switch (S_IFMT & bus->d_inode->i_mode) {
237 case S_IFDIR:
238 update_bus(bus);
239 break;
240 case S_IFREG:
241 update_special(bus);
242 break;
243 default:
244 printk(KERN_WARNING "usbfs: Unknown node %s "
245 "mode %x found on remount!\n",
246 bus->d_name.name, bus->d_inode->i_mode);
247 break;
248 }
249 }
250 }
251
252 mutex_unlock(&root->d_inode->i_mutex);
253 }
254
255 static int remount(struct super_block *sb, int *flags, char *data)
256 {
257 /* If this is not a real mount,
258 * i.e. it's a simple_pin_fs from create_special_files,
259 * then ignore it.
260 */
261 if (ignore_mount)
262 return 0;
263
264 if (parse_options(sb, data)) {
265 printk(KERN_WARNING "usbfs: mount parameter error.\n");
266 return -EINVAL;
267 }
268
269 lock_kernel();
270
271 if (usbfs_mount && usbfs_mount->mnt_sb)
272 update_sb(usbfs_mount->mnt_sb);
273
274 unlock_kernel();
275
276 return 0;
277 }
278
279 static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev)
280 {
281 struct inode *inode = new_inode(sb);
282
283 if (inode) {
284 inode->i_mode = mode;
285 inode->i_uid = current_fsuid();
286 inode->i_gid = current_fsgid();
287 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
288 switch (mode & S_IFMT) {
289 default:
290 init_special_inode(inode, mode, dev);
291 break;
292 case S_IFREG:
293 inode->i_fop = &default_file_operations;
294 break;
295 case S_IFDIR:
296 inode->i_op = &simple_dir_inode_operations;
297 inode->i_fop = &simple_dir_operations;
298
299 /* directory inodes start off with i_nlink == 2 (for "." entry) */
300 inc_nlink(inode);
301 break;
302 }
303 }
304 return inode;
305 }
306
307 /* SMP-safe */
308 static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode,
309 dev_t dev)
310 {
311 struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev);
312 int error = -EPERM;
313
314 if (dentry->d_inode)
315 return -EEXIST;
316
317 if (inode) {
318 d_instantiate(dentry, inode);
319 dget(dentry);
320 error = 0;
321 }
322 return error;
323 }
324
325 static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode)
326 {
327 int res;
328
329 mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
330 res = usbfs_mknod (dir, dentry, mode, 0);
331 if (!res)
332 inc_nlink(dir);
333 return res;
334 }
335
336 static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode)
337 {
338 mode = (mode & S_IALLUGO) | S_IFREG;
339 return usbfs_mknod (dir, dentry, mode, 0);
340 }
341
342 static inline int usbfs_positive (struct dentry *dentry)
343 {
344 return dentry->d_inode && !d_unhashed(dentry);
345 }
346
347 static int usbfs_empty (struct dentry *dentry)
348 {
349 struct list_head *list;
350
351 spin_lock(&dcache_lock);
352
353 list_for_each(list, &dentry->d_subdirs) {
354 struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
355 if (usbfs_positive(de)) {
356 spin_unlock(&dcache_lock);
357 return 0;
358 }
359 }
360
361 spin_unlock(&dcache_lock);
362 return 1;
363 }
364
365 static int usbfs_unlink (struct inode *dir, struct dentry *dentry)
366 {
367 struct inode *inode = dentry->d_inode;
368 mutex_lock(&inode->i_mutex);
369 drop_nlink(dentry->d_inode);
370 dput(dentry);
371 mutex_unlock(&inode->i_mutex);
372 d_delete(dentry);
373 return 0;
374 }
375
376 static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
377 {
378 int error = -ENOTEMPTY;
379 struct inode * inode = dentry->d_inode;
380
381 mutex_lock(&inode->i_mutex);
382 dentry_unhash(dentry);
383 if (usbfs_empty(dentry)) {
384 drop_nlink(dentry->d_inode);
385 drop_nlink(dentry->d_inode);
386 dput(dentry);
387 inode->i_flags |= S_DEAD;
388 drop_nlink(dir);
389 error = 0;
390 }
391 mutex_unlock(&inode->i_mutex);
392 if (!error)
393 d_delete(dentry);
394 dput(dentry);
395 return error;
396 }
397
398
399 /* default file operations */
400 static ssize_t default_read_file (struct file *file, char __user *buf,
401 size_t count, loff_t *ppos)
402 {
403 return 0;
404 }
405
406 static ssize_t default_write_file (struct file *file, const char __user *buf,
407 size_t count, loff_t *ppos)
408 {
409 return count;
410 }
411
412 static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
413 {
414 loff_t retval = -EINVAL;
415
416 mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
417 switch(orig) {
418 case 0:
419 if (offset > 0) {
420 file->f_pos = offset;
421 retval = file->f_pos;
422 }
423 break;
424 case 1:
425 if ((offset + file->f_pos) > 0) {
426 file->f_pos += offset;
427 retval = file->f_pos;
428 }
429 break;
430 default:
431 break;
432 }
433 mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
434 return retval;
435 }
436
437 static int default_open (struct inode *inode, struct file *file)
438 {
439 if (inode->i_private)
440 file->private_data = inode->i_private;
441
442 return 0;
443 }
444
445 static const struct file_operations default_file_operations = {
446 .read = default_read_file,
447 .write = default_write_file,
448 .open = default_open,
449 .llseek = default_file_lseek,
450 };
451
452 static struct super_operations usbfs_ops = {
453 .statfs = simple_statfs,
454 .drop_inode = generic_delete_inode,
455 .remount_fs = remount,
456 .show_options = usbfs_show_options,
457 };
458
459 static int usbfs_fill_super(struct super_block *sb, void *data, int silent)
460 {
461 struct inode *inode;
462 struct dentry *root;
463
464 sb->s_blocksize = PAGE_CACHE_SIZE;
465 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
466 sb->s_magic = USBDEVICE_SUPER_MAGIC;
467 sb->s_op = &usbfs_ops;
468 sb->s_time_gran = 1;
469 inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0);
470
471 if (!inode) {
472 dbg("%s: could not get inode!",__func__);
473 return -ENOMEM;
474 }
475
476 root = d_alloc_root(inode);
477 if (!root) {
478 dbg("%s: could not get root dentry!",__func__);
479 iput(inode);
480 return -ENOMEM;
481 }
482 sb->s_root = root;
483 return 0;
484 }
485
486 /*
487 * fs_create_by_name - create a file, given a name
488 * @name: name of file
489 * @mode: type of file
490 * @parent: dentry of directory to create it in
491 * @dentry: resulting dentry of file
492 *
493 * This function handles both regular files and directories.
494 */
495 static int fs_create_by_name (const char *name, mode_t mode,
496 struct dentry *parent, struct dentry **dentry)
497 {
498 int error = 0;
499
500 /* If the parent is not specified, we create it in the root.
501 * We need the root dentry to do this, which is in the super
502 * block. A pointer to that is in the struct vfsmount that we
503 * have around.
504 */
505 if (!parent ) {
506 if (usbfs_mount && usbfs_mount->mnt_sb) {
507 parent = usbfs_mount->mnt_sb->s_root;
508 }
509 }
510
511 if (!parent) {
512 dbg("Ah! can not find a parent!");
513 return -EFAULT;
514 }
515
516 *dentry = NULL;
517 mutex_lock(&parent->d_inode->i_mutex);
518 *dentry = lookup_one_len(name, parent, strlen(name));
519 if (!IS_ERR(dentry)) {
520 if ((mode & S_IFMT) == S_IFDIR)
521 error = usbfs_mkdir (parent->d_inode, *dentry, mode);
522 else
523 error = usbfs_create (parent->d_inode, *dentry, mode);
524 } else
525 error = PTR_ERR(dentry);
526 mutex_unlock(&parent->d_inode->i_mutex);
527
528 return error;
529 }
530
531 static struct dentry *fs_create_file (const char *name, mode_t mode,
532 struct dentry *parent, void *data,
533 const struct file_operations *fops,
534 uid_t uid, gid_t gid)
535 {
536 struct dentry *dentry;
537 int error;
538
539 dbg("creating file '%s'",name);
540
541 error = fs_create_by_name (name, mode, parent, &dentry);
542 if (error) {
543 dentry = NULL;
544 } else {
545 if (dentry->d_inode) {
546 if (data)
547 dentry->d_inode->i_private = data;
548 if (fops)
549 dentry->d_inode->i_fop = fops;
550 dentry->d_inode->i_uid = uid;
551 dentry->d_inode->i_gid = gid;
552 }
553 }
554
555 return dentry;
556 }
557
558 static void fs_remove_file (struct dentry *dentry)
559 {
560 struct dentry *parent = dentry->d_parent;
561
562 if (!parent || !parent->d_inode)
563 return;
564
565 mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT);
566 if (usbfs_positive(dentry)) {
567 if (dentry->d_inode) {
568 if (S_ISDIR(dentry->d_inode->i_mode))
569 usbfs_rmdir(parent->d_inode, dentry);
570 else
571 usbfs_unlink(parent->d_inode, dentry);
572 dput(dentry);
573 }
574 }
575 mutex_unlock(&parent->d_inode->i_mutex);
576 }
577
578 /* --------------------------------------------------------------------- */
579
580 static int usb_get_sb(struct file_system_type *fs_type,
581 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
582 {
583 return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt);
584 }
585
586 static struct file_system_type usb_fs_type = {
587 .owner = THIS_MODULE,
588 .name = "usbfs",
589 .get_sb = usb_get_sb,
590 .kill_sb = kill_litter_super,
591 };
592
593 /* --------------------------------------------------------------------- */
594
595 static int create_special_files (void)
596 {
597 struct dentry *parent;
598 int retval;
599
600 /* the simple_pin_fs calls will call remount with no options
601 * without this flag that would overwrite the real mount options (if any)
602 */
603 ignore_mount = 1;
604
605 /* create the devices special file */
606 retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
607 if (retval) {
608 printk(KERN_ERR "Unable to get usbfs mount\n");
609 goto exit;
610 }
611
612 ignore_mount = 0;
613
614 parent = usbfs_mount->mnt_sb->s_root;
615 devices_usbfs_dentry = fs_create_file ("devices",
616 listmode | S_IFREG, parent,
617 NULL, &usbfs_devices_fops,
618 listuid, listgid);
619 if (devices_usbfs_dentry == NULL) {
620 printk(KERN_ERR "Unable to create devices usbfs file\n");
621 retval = -ENODEV;
622 goto error_clean_mounts;
623 }
624
625 goto exit;
626
627 error_clean_mounts:
628 simple_release_fs(&usbfs_mount, &usbfs_mount_count);
629 exit:
630 return retval;
631 }
632
633 static void remove_special_files (void)
634 {
635 if (devices_usbfs_dentry)
636 fs_remove_file (devices_usbfs_dentry);
637 devices_usbfs_dentry = NULL;
638 simple_release_fs(&usbfs_mount, &usbfs_mount_count);
639 }
640
641 void usbfs_update_special (void)
642 {
643 struct inode *inode;
644
645 if (devices_usbfs_dentry) {
646 inode = devices_usbfs_dentry->d_inode;
647 if (inode)
648 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
649 }
650 }
651
652 static void usbfs_add_bus(struct usb_bus *bus)
653 {
654 struct dentry *parent;
655 char name[8];
656 int retval;
657
658 /* create the special files if this is the first bus added */
659 if (num_buses == 0) {
660 retval = create_special_files();
661 if (retval)
662 return;
663 }
664 ++num_buses;
665
666 sprintf (name, "%03d", bus->busnum);
667
668 parent = usbfs_mount->mnt_sb->s_root;
669 bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
670 bus, NULL, busuid, busgid);
671 if (bus->usbfs_dentry == NULL) {
672 printk(KERN_ERR "Error creating usbfs bus entry\n");
673 return;
674 }
675 }
676
677 static void usbfs_remove_bus(struct usb_bus *bus)
678 {
679 if (bus->usbfs_dentry) {
680 fs_remove_file (bus->usbfs_dentry);
681 bus->usbfs_dentry = NULL;
682 }
683
684 --num_buses;
685 if (num_buses <= 0) {
686 remove_special_files();
687 num_buses = 0;
688 }
689 }
690
691 static void usbfs_add_device(struct usb_device *dev)
692 {
693 char name[8];
694 int i;
695 int i_size;
696
697 sprintf (name, "%03d", dev->devnum);
698 dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG,
699 dev->bus->usbfs_dentry, dev,
700 &usbdev_file_operations,
701 devuid, devgid);
702 if (dev->usbfs_dentry == NULL) {
703 printk(KERN_ERR "Error creating usbfs device entry\n");
704 return;
705 }
706
707 /* Set the size of the device's file to be
708 * equal to the size of the device descriptors. */
709 i_size = sizeof (struct usb_device_descriptor);
710 for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) {
711 struct usb_config_descriptor *config =
712 (struct usb_config_descriptor *)dev->rawdescriptors[i];
713 i_size += le16_to_cpu(config->wTotalLength);
714 }
715 if (dev->usbfs_dentry->d_inode)
716 dev->usbfs_dentry->d_inode->i_size = i_size;
717 }
718
719 static void usbfs_remove_device(struct usb_device *dev)
720 {
721 if (dev->usbfs_dentry) {
722 fs_remove_file (dev->usbfs_dentry);
723 dev->usbfs_dentry = NULL;
724 }
725 }
726
727 static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev)
728 {
729 switch (action) {
730 case USB_DEVICE_ADD:
731 usbfs_add_device(dev);
732 break;
733 case USB_DEVICE_REMOVE:
734 usbfs_remove_device(dev);
735 break;
736 case USB_BUS_ADD:
737 usbfs_add_bus(dev);
738 break;
739 case USB_BUS_REMOVE:
740 usbfs_remove_bus(dev);
741 }
742
743 usbfs_update_special();
744 usbfs_conn_disc_event();
745 return NOTIFY_OK;
746 }
747
748 static struct notifier_block usbfs_nb = {
749 .notifier_call = usbfs_notify,
750 };
751
752 /* --------------------------------------------------------------------- */
753
754 static struct proc_dir_entry *usbdir = NULL;
755
756 int __init usbfs_init(void)
757 {
758 int retval;
759
760 retval = register_filesystem(&usb_fs_type);
761 if (retval)
762 return retval;
763
764 usb_register_notify(&usbfs_nb);
765
766 /* create mount point for usbfs */
767 usbdir = proc_mkdir("bus/usb", NULL);
768
769 return 0;
770 }
771
772 void usbfs_cleanup(void)
773 {
774 usb_unregister_notify(&usbfs_nb);
775 unregister_filesystem(&usb_fs_type);
776 if (usbdir)
777 remove_proc_entry("bus/usb", NULL);
778 }
779
connection oriented routing - ARCHIVE NO UPDATES HERE