Loading...
1/*
2 * Copyright (c) International Business Machines Corp., 2006
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Author: Artem Bityutskiy (Битюцкий Артём)
19 */
20
21/*
22 * This file includes implementation of UBI character device operations.
23 *
24 * There are two kinds of character devices in UBI: UBI character devices and
25 * UBI volume character devices. UBI character devices allow users to
26 * manipulate whole volumes: create, remove, and re-size them. Volume character
27 * devices provide volume I/O capabilities.
28 *
29 * Major and minor numbers are assigned dynamically to both UBI and volume
30 * character devices.
31 *
32 * Well, there is the third kind of character devices - the UBI control
33 * character device, which allows to manipulate by UBI devices - create and
34 * delete them. In other words, it is used for attaching and detaching MTD
35 * devices.
36 */
37
38#include <linux/module.h>
39#include <linux/stat.h>
40#include <linux/slab.h>
41#include <linux/ioctl.h>
42#include <linux/capability.h>
43#include <linux/uaccess.h>
44#include <linux/compat.h>
45#include <linux/math64.h>
46#include <mtd/ubi-user.h>
47#include "ubi.h"
48
49/**
50 * get_exclusive - get exclusive access to an UBI volume.
51 * @desc: volume descriptor
52 *
53 * This function changes UBI volume open mode to "exclusive". Returns previous
54 * mode value (positive integer) in case of success and a negative error code
55 * in case of failure.
56 */
57static int get_exclusive(struct ubi_volume_desc *desc)
58{
59 int users, err;
60 struct ubi_volume *vol = desc->vol;
61
62 spin_lock(&vol->ubi->volumes_lock);
63 users = vol->readers + vol->writers + vol->exclusive;
64 ubi_assert(users > 0);
65 if (users > 1) {
66 ubi_err("%d users for volume %d", users, vol->vol_id);
67 err = -EBUSY;
68 } else {
69 vol->readers = vol->writers = 0;
70 vol->exclusive = 1;
71 err = desc->mode;
72 desc->mode = UBI_EXCLUSIVE;
73 }
74 spin_unlock(&vol->ubi->volumes_lock);
75
76 return err;
77}
78
79/**
80 * revoke_exclusive - revoke exclusive mode.
81 * @desc: volume descriptor
82 * @mode: new mode to switch to
83 */
84static void revoke_exclusive(struct ubi_volume_desc *desc, int mode)
85{
86 struct ubi_volume *vol = desc->vol;
87
88 spin_lock(&vol->ubi->volumes_lock);
89 ubi_assert(vol->readers == 0 && vol->writers == 0);
90 ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE);
91 vol->exclusive = 0;
92 if (mode == UBI_READONLY)
93 vol->readers = 1;
94 else if (mode == UBI_READWRITE)
95 vol->writers = 1;
96 else
97 vol->exclusive = 1;
98 spin_unlock(&vol->ubi->volumes_lock);
99
100 desc->mode = mode;
101}
102
103static int vol_cdev_open(struct inode *inode, struct file *file)
104{
105 struct ubi_volume_desc *desc;
106 int vol_id = iminor(inode) - 1, mode, ubi_num;
107
108 ubi_num = ubi_major2num(imajor(inode));
109 if (ubi_num < 0)
110 return ubi_num;
111
112 if (file->f_mode & FMODE_WRITE)
113 mode = UBI_READWRITE;
114 else
115 mode = UBI_READONLY;
116
117 dbg_gen("open device %d, volume %d, mode %d",
118 ubi_num, vol_id, mode);
119
120 desc = ubi_open_volume(ubi_num, vol_id, mode);
121 if (IS_ERR(desc))
122 return PTR_ERR(desc);
123
124 file->private_data = desc;
125 return 0;
126}
127
128static int vol_cdev_release(struct inode *inode, struct file *file)
129{
130 struct ubi_volume_desc *desc = file->private_data;
131 struct ubi_volume *vol = desc->vol;
132
133 dbg_gen("release device %d, volume %d, mode %d",
134 vol->ubi->ubi_num, vol->vol_id, desc->mode);
135
136 if (vol->updating) {
137 ubi_warn("update of volume %d not finished, volume is damaged",
138 vol->vol_id);
139 ubi_assert(!vol->changing_leb);
140 vol->updating = 0;
141 vfree(vol->upd_buf);
142 } else if (vol->changing_leb) {
143 dbg_gen("only %lld of %lld bytes received for atomic LEB change"
144 " for volume %d:%d, cancel", vol->upd_received,
145 vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id);
146 vol->changing_leb = 0;
147 vfree(vol->upd_buf);
148 }
149
150 ubi_close_volume(desc);
151 return 0;
152}
153
154static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
155{
156 struct ubi_volume_desc *desc = file->private_data;
157 struct ubi_volume *vol = desc->vol;
158 loff_t new_offset;
159
160 if (vol->updating) {
161 /* Update is in progress, seeking is prohibited */
162 ubi_err("updating");
163 return -EBUSY;
164 }
165
166 switch (origin) {
167 case 0: /* SEEK_SET */
168 new_offset = offset;
169 break;
170 case 1: /* SEEK_CUR */
171 new_offset = file->f_pos + offset;
172 break;
173 case 2: /* SEEK_END */
174 new_offset = vol->used_bytes + offset;
175 break;
176 default:
177 return -EINVAL;
178 }
179
180 if (new_offset < 0 || new_offset > vol->used_bytes) {
181 ubi_err("bad seek %lld", new_offset);
182 return -EINVAL;
183 }
184
185 dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld",
186 vol->vol_id, offset, origin, new_offset);
187
188 file->f_pos = new_offset;
189 return new_offset;
190}
191
192static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, int datasync)
193{
194 struct ubi_volume_desc *desc = file->private_data;
195 struct ubi_device *ubi = desc->vol->ubi;
196 struct inode *inode = file->f_path.dentry->d_inode;
197 int err;
198 mutex_lock(&inode->i_mutex);
199 err = ubi_sync(ubi->ubi_num);
200 mutex_unlock(&inode->i_mutex);
201 return err;
202}
203
204
205static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
206 loff_t *offp)
207{
208 struct ubi_volume_desc *desc = file->private_data;
209 struct ubi_volume *vol = desc->vol;
210 struct ubi_device *ubi = vol->ubi;
211 int err, lnum, off, len, tbuf_size;
212 size_t count_save = count;
213 void *tbuf;
214
215 dbg_gen("read %zd bytes from offset %lld of volume %d",
216 count, *offp, vol->vol_id);
217
218 if (vol->updating) {
219 ubi_err("updating");
220 return -EBUSY;
221 }
222 if (vol->upd_marker) {
223 ubi_err("damaged volume, update marker is set");
224 return -EBADF;
225 }
226 if (*offp == vol->used_bytes || count == 0)
227 return 0;
228
229 if (vol->corrupted)
230 dbg_gen("read from corrupted volume %d", vol->vol_id);
231
232 if (*offp + count > vol->used_bytes)
233 count_save = count = vol->used_bytes - *offp;
234
235 tbuf_size = vol->usable_leb_size;
236 if (count < tbuf_size)
237 tbuf_size = ALIGN(count, ubi->min_io_size);
238 tbuf = vmalloc(tbuf_size);
239 if (!tbuf)
240 return -ENOMEM;
241
242 len = count > tbuf_size ? tbuf_size : count;
243 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
244
245 do {
246 cond_resched();
247
248 if (off + len >= vol->usable_leb_size)
249 len = vol->usable_leb_size - off;
250
251 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
252 if (err)
253 break;
254
255 off += len;
256 if (off == vol->usable_leb_size) {
257 lnum += 1;
258 off -= vol->usable_leb_size;
259 }
260
261 count -= len;
262 *offp += len;
263
264 err = copy_to_user(buf, tbuf, len);
265 if (err) {
266 err = -EFAULT;
267 break;
268 }
269
270 buf += len;
271 len = count > tbuf_size ? tbuf_size : count;
272 } while (count);
273
274 vfree(tbuf);
275 return err ? err : count_save - count;
276}
277
278/*
279 * This function allows to directly write to dynamic UBI volumes, without
280 * issuing the volume update operation.
281 */
282static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
283 size_t count, loff_t *offp)
284{
285 struct ubi_volume_desc *desc = file->private_data;
286 struct ubi_volume *vol = desc->vol;
287 struct ubi_device *ubi = vol->ubi;
288 int lnum, off, len, tbuf_size, err = 0;
289 size_t count_save = count;
290 char *tbuf;
291
292 if (!vol->direct_writes)
293 return -EPERM;
294
295 dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
296 count, *offp, vol->vol_id);
297
298 if (vol->vol_type == UBI_STATIC_VOLUME)
299 return -EROFS;
300
301 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
302 if (off & (ubi->min_io_size - 1)) {
303 ubi_err("unaligned position");
304 return -EINVAL;
305 }
306
307 if (*offp + count > vol->used_bytes)
308 count_save = count = vol->used_bytes - *offp;
309
310 /* We can write only in fractions of the minimum I/O unit */
311 if (count & (ubi->min_io_size - 1)) {
312 ubi_err("unaligned write length");
313 return -EINVAL;
314 }
315
316 tbuf_size = vol->usable_leb_size;
317 if (count < tbuf_size)
318 tbuf_size = ALIGN(count, ubi->min_io_size);
319 tbuf = vmalloc(tbuf_size);
320 if (!tbuf)
321 return -ENOMEM;
322
323 len = count > tbuf_size ? tbuf_size : count;
324
325 while (count) {
326 cond_resched();
327
328 if (off + len >= vol->usable_leb_size)
329 len = vol->usable_leb_size - off;
330
331 err = copy_from_user(tbuf, buf, len);
332 if (err) {
333 err = -EFAULT;
334 break;
335 }
336
337 err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len);
338 if (err)
339 break;
340
341 off += len;
342 if (off == vol->usable_leb_size) {
343 lnum += 1;
344 off -= vol->usable_leb_size;
345 }
346
347 count -= len;
348 *offp += len;
349 buf += len;
350 len = count > tbuf_size ? tbuf_size : count;
351 }
352
353 vfree(tbuf);
354 return err ? err : count_save - count;
355}
356
357static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
358 size_t count, loff_t *offp)
359{
360 int err = 0;
361 struct ubi_volume_desc *desc = file->private_data;
362 struct ubi_volume *vol = desc->vol;
363 struct ubi_device *ubi = vol->ubi;
364
365 if (!vol->updating && !vol->changing_leb)
366 return vol_cdev_direct_write(file, buf, count, offp);
367
368 if (vol->updating)
369 err = ubi_more_update_data(ubi, vol, buf, count);
370 else
371 err = ubi_more_leb_change_data(ubi, vol, buf, count);
372
373 if (err < 0) {
374 ubi_err("cannot accept more %zd bytes of data, error %d",
375 count, err);
376 return err;
377 }
378
379 if (err) {
380 /*
381 * The operation is finished, @err contains number of actually
382 * written bytes.
383 */
384 count = err;
385
386 if (vol->changing_leb) {
387 revoke_exclusive(desc, UBI_READWRITE);
388 return count;
389 }
390
391 err = ubi_check_volume(ubi, vol->vol_id);
392 if (err < 0)
393 return err;
394
395 if (err) {
396 ubi_warn("volume %d on UBI device %d is corrupted",
397 vol->vol_id, ubi->ubi_num);
398 vol->corrupted = 1;
399 }
400 vol->checked = 1;
401 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
402 revoke_exclusive(desc, UBI_READWRITE);
403 }
404
405 return count;
406}
407
408static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
409 unsigned long arg)
410{
411 int err = 0;
412 struct ubi_volume_desc *desc = file->private_data;
413 struct ubi_volume *vol = desc->vol;
414 struct ubi_device *ubi = vol->ubi;
415 void __user *argp = (void __user *)arg;
416
417 switch (cmd) {
418 /* Volume update command */
419 case UBI_IOCVOLUP:
420 {
421 int64_t bytes, rsvd_bytes;
422
423 if (!capable(CAP_SYS_RESOURCE)) {
424 err = -EPERM;
425 break;
426 }
427
428 err = copy_from_user(&bytes, argp, sizeof(int64_t));
429 if (err) {
430 err = -EFAULT;
431 break;
432 }
433
434 if (desc->mode == UBI_READONLY) {
435 err = -EROFS;
436 break;
437 }
438
439 rsvd_bytes = (long long)vol->reserved_pebs *
440 ubi->leb_size-vol->data_pad;
441 if (bytes < 0 || bytes > rsvd_bytes) {
442 err = -EINVAL;
443 break;
444 }
445
446 err = get_exclusive(desc);
447 if (err < 0)
448 break;
449
450 err = ubi_start_update(ubi, vol, bytes);
451 if (bytes == 0)
452 revoke_exclusive(desc, UBI_READWRITE);
453 break;
454 }
455
456 /* Atomic logical eraseblock change command */
457 case UBI_IOCEBCH:
458 {
459 struct ubi_leb_change_req req;
460
461 err = copy_from_user(&req, argp,
462 sizeof(struct ubi_leb_change_req));
463 if (err) {
464 err = -EFAULT;
465 break;
466 }
467
468 if (desc->mode == UBI_READONLY ||
469 vol->vol_type == UBI_STATIC_VOLUME) {
470 err = -EROFS;
471 break;
472 }
473
474 /* Validate the request */
475 err = -EINVAL;
476 if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
477 req.bytes < 0 || req.lnum >= vol->usable_leb_size)
478 break;
479
480 err = get_exclusive(desc);
481 if (err < 0)
482 break;
483
484 err = ubi_start_leb_change(ubi, vol, &req);
485 if (req.bytes == 0)
486 revoke_exclusive(desc, UBI_READWRITE);
487 break;
488 }
489
490 /* Logical eraseblock erasure command */
491 case UBI_IOCEBER:
492 {
493 int32_t lnum;
494
495 err = get_user(lnum, (__user int32_t *)argp);
496 if (err) {
497 err = -EFAULT;
498 break;
499 }
500
501 if (desc->mode == UBI_READONLY ||
502 vol->vol_type == UBI_STATIC_VOLUME) {
503 err = -EROFS;
504 break;
505 }
506
507 if (lnum < 0 || lnum >= vol->reserved_pebs) {
508 err = -EINVAL;
509 break;
510 }
511
512 dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);
513 err = ubi_eba_unmap_leb(ubi, vol, lnum);
514 if (err)
515 break;
516
517 err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);
518 break;
519 }
520
521 /* Logical eraseblock map command */
522 case UBI_IOCEBMAP:
523 {
524 struct ubi_map_req req;
525
526 err = copy_from_user(&req, argp, sizeof(struct ubi_map_req));
527 if (err) {
528 err = -EFAULT;
529 break;
530 }
531 err = ubi_leb_map(desc, req.lnum);
532 break;
533 }
534
535 /* Logical eraseblock un-map command */
536 case UBI_IOCEBUNMAP:
537 {
538 int32_t lnum;
539
540 err = get_user(lnum, (__user int32_t *)argp);
541 if (err) {
542 err = -EFAULT;
543 break;
544 }
545 err = ubi_leb_unmap(desc, lnum);
546 break;
547 }
548
549 /* Check if logical eraseblock is mapped command */
550 case UBI_IOCEBISMAP:
551 {
552 int32_t lnum;
553
554 err = get_user(lnum, (__user int32_t *)argp);
555 if (err) {
556 err = -EFAULT;
557 break;
558 }
559 err = ubi_is_mapped(desc, lnum);
560 break;
561 }
562
563 /* Set volume property command */
564 case UBI_IOCSETVOLPROP:
565 {
566 struct ubi_set_vol_prop_req req;
567
568 err = copy_from_user(&req, argp,
569 sizeof(struct ubi_set_vol_prop_req));
570 if (err) {
571 err = -EFAULT;
572 break;
573 }
574 switch (req.property) {
575 case UBI_VOL_PROP_DIRECT_WRITE:
576 mutex_lock(&ubi->device_mutex);
577 desc->vol->direct_writes = !!req.value;
578 mutex_unlock(&ubi->device_mutex);
579 break;
580 default:
581 err = -EINVAL;
582 break;
583 }
584 break;
585 }
586
587 default:
588 err = -ENOTTY;
589 break;
590 }
591 return err;
592}
593
594/**
595 * verify_mkvol_req - verify volume creation request.
596 * @ubi: UBI device description object
597 * @req: the request to check
598 *
599 * This function zero if the request is correct, and %-EINVAL if not.
600 */
601static int verify_mkvol_req(const struct ubi_device *ubi,
602 const struct ubi_mkvol_req *req)
603{
604 int n, err = -EINVAL;
605
606 if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||
607 req->name_len < 0)
608 goto bad;
609
610 if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&
611 req->vol_id != UBI_VOL_NUM_AUTO)
612 goto bad;
613
614 if (req->alignment == 0)
615 goto bad;
616
617 if (req->bytes == 0)
618 goto bad;
619
620 if (req->vol_type != UBI_DYNAMIC_VOLUME &&
621 req->vol_type != UBI_STATIC_VOLUME)
622 goto bad;
623
624 if (req->alignment > ubi->leb_size)
625 goto bad;
626
627 n = req->alignment & (ubi->min_io_size - 1);
628 if (req->alignment != 1 && n)
629 goto bad;
630
631 if (!req->name[0] || !req->name_len)
632 goto bad;
633
634 if (req->name_len > UBI_VOL_NAME_MAX) {
635 err = -ENAMETOOLONG;
636 goto bad;
637 }
638
639 n = strnlen(req->name, req->name_len + 1);
640 if (n != req->name_len)
641 goto bad;
642
643 return 0;
644
645bad:
646 ubi_err("bad volume creation request");
647 ubi_dump_mkvol_req(req);
648 return err;
649}
650
651/**
652 * verify_rsvol_req - verify volume re-size request.
653 * @ubi: UBI device description object
654 * @req: the request to check
655 *
656 * This function returns zero if the request is correct, and %-EINVAL if not.
657 */
658static int verify_rsvol_req(const struct ubi_device *ubi,
659 const struct ubi_rsvol_req *req)
660{
661 if (req->bytes <= 0)
662 return -EINVAL;
663
664 if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots)
665 return -EINVAL;
666
667 return 0;
668}
669
670/**
671 * rename_volumes - rename UBI volumes.
672 * @ubi: UBI device description object
673 * @req: volumes re-name request
674 *
675 * This is a helper function for the volume re-name IOCTL which validates the
676 * the request, opens the volume and calls corresponding volumes management
677 * function. Returns zero in case of success and a negative error code in case
678 * of failure.
679 */
680static int rename_volumes(struct ubi_device *ubi,
681 struct ubi_rnvol_req *req)
682{
683 int i, n, err;
684 struct list_head rename_list;
685 struct ubi_rename_entry *re, *re1;
686
687 if (req->count < 0 || req->count > UBI_MAX_RNVOL)
688 return -EINVAL;
689
690 if (req->count == 0)
691 return 0;
692
693 /* Validate volume IDs and names in the request */
694 for (i = 0; i < req->count; i++) {
695 if (req->ents[i].vol_id < 0 ||
696 req->ents[i].vol_id >= ubi->vtbl_slots)
697 return -EINVAL;
698 if (req->ents[i].name_len < 0)
699 return -EINVAL;
700 if (req->ents[i].name_len > UBI_VOL_NAME_MAX)
701 return -ENAMETOOLONG;
702 req->ents[i].name[req->ents[i].name_len] = '\0';
703 n = strlen(req->ents[i].name);
704 if (n != req->ents[i].name_len)
705 err = -EINVAL;
706 }
707
708 /* Make sure volume IDs and names are unique */
709 for (i = 0; i < req->count - 1; i++) {
710 for (n = i + 1; n < req->count; n++) {
711 if (req->ents[i].vol_id == req->ents[n].vol_id) {
712 ubi_err("duplicated volume id %d",
713 req->ents[i].vol_id);
714 return -EINVAL;
715 }
716 if (!strcmp(req->ents[i].name, req->ents[n].name)) {
717 ubi_err("duplicated volume name \"%s\"",
718 req->ents[i].name);
719 return -EINVAL;
720 }
721 }
722 }
723
724 /* Create the re-name list */
725 INIT_LIST_HEAD(&rename_list);
726 for (i = 0; i < req->count; i++) {
727 int vol_id = req->ents[i].vol_id;
728 int name_len = req->ents[i].name_len;
729 const char *name = req->ents[i].name;
730
731 re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
732 if (!re) {
733 err = -ENOMEM;
734 goto out_free;
735 }
736
737 re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
738 if (IS_ERR(re->desc)) {
739 err = PTR_ERR(re->desc);
740 ubi_err("cannot open volume %d, error %d", vol_id, err);
741 kfree(re);
742 goto out_free;
743 }
744
745 /* Skip this re-naming if the name does not really change */
746 if (re->desc->vol->name_len == name_len &&
747 !memcmp(re->desc->vol->name, name, name_len)) {
748 ubi_close_volume(re->desc);
749 kfree(re);
750 continue;
751 }
752
753 re->new_name_len = name_len;
754 memcpy(re->new_name, name, name_len);
755 list_add_tail(&re->list, &rename_list);
756 dbg_msg("will rename volume %d from \"%s\" to \"%s\"",
757 vol_id, re->desc->vol->name, name);
758 }
759
760 if (list_empty(&rename_list))
761 return 0;
762
763 /* Find out the volumes which have to be removed */
764 list_for_each_entry(re, &rename_list, list) {
765 struct ubi_volume_desc *desc;
766 int no_remove_needed = 0;
767
768 /*
769 * Volume @re->vol_id is going to be re-named to
770 * @re->new_name, while its current name is @name. If a volume
771 * with name @re->new_name currently exists, it has to be
772 * removed, unless it is also re-named in the request (@req).
773 */
774 list_for_each_entry(re1, &rename_list, list) {
775 if (re->new_name_len == re1->desc->vol->name_len &&
776 !memcmp(re->new_name, re1->desc->vol->name,
777 re1->desc->vol->name_len)) {
778 no_remove_needed = 1;
779 break;
780 }
781 }
782
783 if (no_remove_needed)
784 continue;
785
786 /*
787 * It seems we need to remove volume with name @re->new_name,
788 * if it exists.
789 */
790 desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name,
791 UBI_EXCLUSIVE);
792 if (IS_ERR(desc)) {
793 err = PTR_ERR(desc);
794 if (err == -ENODEV)
795 /* Re-naming into a non-existing volume name */
796 continue;
797
798 /* The volume exists but busy, or an error occurred */
799 ubi_err("cannot open volume \"%s\", error %d",
800 re->new_name, err);
801 goto out_free;
802 }
803
804 re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
805 if (!re1) {
806 err = -ENOMEM;
807 ubi_close_volume(desc);
808 goto out_free;
809 }
810
811 re1->remove = 1;
812 re1->desc = desc;
813 list_add(&re1->list, &rename_list);
814 dbg_msg("will remove volume %d, name \"%s\"",
815 re1->desc->vol->vol_id, re1->desc->vol->name);
816 }
817
818 mutex_lock(&ubi->device_mutex);
819 err = ubi_rename_volumes(ubi, &rename_list);
820 mutex_unlock(&ubi->device_mutex);
821
822out_free:
823 list_for_each_entry_safe(re, re1, &rename_list, list) {
824 ubi_close_volume(re->desc);
825 list_del(&re->list);
826 kfree(re);
827 }
828 return err;
829}
830
831static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
832 unsigned long arg)
833{
834 int err = 0;
835 struct ubi_device *ubi;
836 struct ubi_volume_desc *desc;
837 void __user *argp = (void __user *)arg;
838
839 if (!capable(CAP_SYS_RESOURCE))
840 return -EPERM;
841
842 ubi = ubi_get_by_major(imajor(file->f_mapping->host));
843 if (!ubi)
844 return -ENODEV;
845
846 switch (cmd) {
847 /* Create volume command */
848 case UBI_IOCMKVOL:
849 {
850 struct ubi_mkvol_req req;
851
852 dbg_gen("create volume");
853 err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
854 if (err) {
855 err = -EFAULT;
856 break;
857 }
858
859 err = verify_mkvol_req(ubi, &req);
860 if (err)
861 break;
862
863 mutex_lock(&ubi->device_mutex);
864 err = ubi_create_volume(ubi, &req);
865 mutex_unlock(&ubi->device_mutex);
866 if (err)
867 break;
868
869 err = put_user(req.vol_id, (__user int32_t *)argp);
870 if (err)
871 err = -EFAULT;
872
873 break;
874 }
875
876 /* Remove volume command */
877 case UBI_IOCRMVOL:
878 {
879 int vol_id;
880
881 dbg_gen("remove volume");
882 err = get_user(vol_id, (__user int32_t *)argp);
883 if (err) {
884 err = -EFAULT;
885 break;
886 }
887
888 desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
889 if (IS_ERR(desc)) {
890 err = PTR_ERR(desc);
891 break;
892 }
893
894 mutex_lock(&ubi->device_mutex);
895 err = ubi_remove_volume(desc, 0);
896 mutex_unlock(&ubi->device_mutex);
897
898 /*
899 * The volume is deleted (unless an error occurred), and the
900 * 'struct ubi_volume' object will be freed when
901 * 'ubi_close_volume()' will call 'put_device()'.
902 */
903 ubi_close_volume(desc);
904 break;
905 }
906
907 /* Re-size volume command */
908 case UBI_IOCRSVOL:
909 {
910 int pebs;
911 struct ubi_rsvol_req req;
912
913 dbg_gen("re-size volume");
914 err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
915 if (err) {
916 err = -EFAULT;
917 break;
918 }
919
920 err = verify_rsvol_req(ubi, &req);
921 if (err)
922 break;
923
924 desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);
925 if (IS_ERR(desc)) {
926 err = PTR_ERR(desc);
927 break;
928 }
929
930 pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,
931 desc->vol->usable_leb_size);
932
933 mutex_lock(&ubi->device_mutex);
934 err = ubi_resize_volume(desc, pebs);
935 mutex_unlock(&ubi->device_mutex);
936 ubi_close_volume(desc);
937 break;
938 }
939
940 /* Re-name volumes command */
941 case UBI_IOCRNVOL:
942 {
943 struct ubi_rnvol_req *req;
944
945 dbg_msg("re-name volumes");
946 req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
947 if (!req) {
948 err = -ENOMEM;
949 break;
950 };
951
952 err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));
953 if (err) {
954 err = -EFAULT;
955 kfree(req);
956 break;
957 }
958
959 err = rename_volumes(ubi, req);
960 kfree(req);
961 break;
962 }
963
964 default:
965 err = -ENOTTY;
966 break;
967 }
968
969 ubi_put_device(ubi);
970 return err;
971}
972
973static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
974 unsigned long arg)
975{
976 int err = 0;
977 void __user *argp = (void __user *)arg;
978
979 if (!capable(CAP_SYS_RESOURCE))
980 return -EPERM;
981
982 switch (cmd) {
983 /* Attach an MTD device command */
984 case UBI_IOCATT:
985 {
986 struct ubi_attach_req req;
987 struct mtd_info *mtd;
988
989 dbg_gen("attach MTD device");
990 err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
991 if (err) {
992 err = -EFAULT;
993 break;
994 }
995
996 if (req.mtd_num < 0 ||
997 (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
998 err = -EINVAL;
999 break;
1000 }
1001
1002 mtd = get_mtd_device(NULL, req.mtd_num);
1003 if (IS_ERR(mtd)) {
1004 err = PTR_ERR(mtd);
1005 break;
1006 }
1007
1008 /*
1009 * Note, further request verification is done by
1010 * 'ubi_attach_mtd_dev()'.
1011 */
1012 mutex_lock(&ubi_devices_mutex);
1013 err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset);
1014 mutex_unlock(&ubi_devices_mutex);
1015 if (err < 0)
1016 put_mtd_device(mtd);
1017 else
1018 /* @err contains UBI device number */
1019 err = put_user(err, (__user int32_t *)argp);
1020
1021 break;
1022 }
1023
1024 /* Detach an MTD device command */
1025 case UBI_IOCDET:
1026 {
1027 int ubi_num;
1028
1029 dbg_gen("dettach MTD device");
1030 err = get_user(ubi_num, (__user int32_t *)argp);
1031 if (err) {
1032 err = -EFAULT;
1033 break;
1034 }
1035
1036 mutex_lock(&ubi_devices_mutex);
1037 err = ubi_detach_mtd_dev(ubi_num, 0);
1038 mutex_unlock(&ubi_devices_mutex);
1039 break;
1040 }
1041
1042 default:
1043 err = -ENOTTY;
1044 break;
1045 }
1046
1047 return err;
1048}
1049
1050#ifdef CONFIG_COMPAT
1051static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1052 unsigned long arg)
1053{
1054 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1055
1056 return vol_cdev_ioctl(file, cmd, translated_arg);
1057}
1058
1059static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1060 unsigned long arg)
1061{
1062 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1063
1064 return ubi_cdev_ioctl(file, cmd, translated_arg);
1065}
1066
1067static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1068 unsigned long arg)
1069{
1070 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1071
1072 return ctrl_cdev_ioctl(file, cmd, translated_arg);
1073}
1074#else
1075#define vol_cdev_compat_ioctl NULL
1076#define ubi_cdev_compat_ioctl NULL
1077#define ctrl_cdev_compat_ioctl NULL
1078#endif
1079
1080/* UBI volume character device operations */
1081const struct file_operations ubi_vol_cdev_operations = {
1082 .owner = THIS_MODULE,
1083 .open = vol_cdev_open,
1084 .release = vol_cdev_release,
1085 .llseek = vol_cdev_llseek,
1086 .read = vol_cdev_read,
1087 .write = vol_cdev_write,
1088 .fsync = vol_cdev_fsync,
1089 .unlocked_ioctl = vol_cdev_ioctl,
1090 .compat_ioctl = vol_cdev_compat_ioctl,
1091};
1092
1093/* UBI character device operations */
1094const struct file_operations ubi_cdev_operations = {
1095 .owner = THIS_MODULE,
1096 .llseek = no_llseek,
1097 .unlocked_ioctl = ubi_cdev_ioctl,
1098 .compat_ioctl = ubi_cdev_compat_ioctl,
1099};
1100
1101/* UBI control character device operations */
1102const struct file_operations ubi_ctrl_cdev_operations = {
1103 .owner = THIS_MODULE,
1104 .unlocked_ioctl = ctrl_cdev_ioctl,
1105 .compat_ioctl = ctrl_cdev_compat_ioctl,
1106 .llseek = no_llseek,
1107};