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Linux 3.12.39
[linux/fpc-iii.git] / drivers / mtd / ubi / cdev.c
blob8ca49f2043e4b8a7fe41109129de5760995b59d4
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 */
57 static 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 */
84 static 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
103 static 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
128 static 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 for volume %d:%d, cancel",
144 vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num,
145 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
154 static 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
159 if (vol->updating) {
160 /* Update is in progress, seeking is prohibited */
161 ubi_err("updating");
162 return -EBUSY;
163 }
164
165 return fixed_size_llseek(file, offset, origin, vol->used_bytes);
166 }
167
168 static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,
169 int datasync)
170 {
171 struct ubi_volume_desc *desc = file->private_data;
172 struct ubi_device *ubi = desc->vol->ubi;
173 struct inode *inode = file_inode(file);
174 int err;
175 mutex_lock(&inode->i_mutex);
176 err = ubi_sync(ubi->ubi_num);
177 mutex_unlock(&inode->i_mutex);
178 return err;
179 }
180
181
182 static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
183 loff_t *offp)
184 {
185 struct ubi_volume_desc *desc = file->private_data;
186 struct ubi_volume *vol = desc->vol;
187 struct ubi_device *ubi = vol->ubi;
188 int err, lnum, off, len, tbuf_size;
189 size_t count_save = count;
190 void *tbuf;
191
192 dbg_gen("read %zd bytes from offset %lld of volume %d",
193 count, *offp, vol->vol_id);
194
195 if (vol->updating) {
196 ubi_err("updating");
197 return -EBUSY;
198 }
199 if (vol->upd_marker) {
200 ubi_err("damaged volume, update marker is set");
201 return -EBADF;
202 }
203 if (*offp == vol->used_bytes || count == 0)
204 return 0;
205
206 if (vol->corrupted)
207 dbg_gen("read from corrupted volume %d", vol->vol_id);
208
209 if (*offp + count > vol->used_bytes)
210 count_save = count = vol->used_bytes - *offp;
211
212 tbuf_size = vol->usable_leb_size;
213 if (count < tbuf_size)
214 tbuf_size = ALIGN(count, ubi->min_io_size);
215 tbuf = vmalloc(tbuf_size);
216 if (!tbuf)
217 return -ENOMEM;
218
219 len = count > tbuf_size ? tbuf_size : count;
220 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
221
222 do {
223 cond_resched();
224
225 if (off + len >= vol->usable_leb_size)
226 len = vol->usable_leb_size - off;
227
228 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
229 if (err)
230 break;
231
232 off += len;
233 if (off == vol->usable_leb_size) {
234 lnum += 1;
235 off -= vol->usable_leb_size;
236 }
237
238 count -= len;
239 *offp += len;
240
241 err = copy_to_user(buf, tbuf, len);
242 if (err) {
243 err = -EFAULT;
244 break;
245 }
246
247 buf += len;
248 len = count > tbuf_size ? tbuf_size : count;
249 } while (count);
250
251 vfree(tbuf);
252 return err ? err : count_save - count;
253 }
254
255 /*
256 * This function allows to directly write to dynamic UBI volumes, without
257 * issuing the volume update operation.
258 */
259 static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
260 size_t count, loff_t *offp)
261 {
262 struct ubi_volume_desc *desc = file->private_data;
263 struct ubi_volume *vol = desc->vol;
264 struct ubi_device *ubi = vol->ubi;
265 int lnum, off, len, tbuf_size, err = 0;
266 size_t count_save = count;
267 char *tbuf;
268
269 if (!vol->direct_writes)
270 return -EPERM;
271
272 dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
273 count, *offp, vol->vol_id);
274
275 if (vol->vol_type == UBI_STATIC_VOLUME)
276 return -EROFS;
277
278 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
279 if (off & (ubi->min_io_size - 1)) {
280 ubi_err("unaligned position");
281 return -EINVAL;
282 }
283
284 if (*offp + count > vol->used_bytes)
285 count_save = count = vol->used_bytes - *offp;
286
287 /* We can write only in fractions of the minimum I/O unit */
288 if (count & (ubi->min_io_size - 1)) {
289 ubi_err("unaligned write length");
290 return -EINVAL;
291 }
292
293 tbuf_size = vol->usable_leb_size;
294 if (count < tbuf_size)
295 tbuf_size = ALIGN(count, ubi->min_io_size);
296 tbuf = vmalloc(tbuf_size);
297 if (!tbuf)
298 return -ENOMEM;
299
300 len = count > tbuf_size ? tbuf_size : count;
301
302 while (count) {
303 cond_resched();
304
305 if (off + len >= vol->usable_leb_size)
306 len = vol->usable_leb_size - off;
307
308 err = copy_from_user(tbuf, buf, len);
309 if (err) {
310 err = -EFAULT;
311 break;
312 }
313
314 err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len);
315 if (err)
316 break;
317
318 off += len;
319 if (off == vol->usable_leb_size) {
320 lnum += 1;
321 off -= vol->usable_leb_size;
322 }
323
324 count -= len;
325 *offp += len;
326 buf += len;
327 len = count > tbuf_size ? tbuf_size : count;
328 }
329
330 vfree(tbuf);
331 return err ? err : count_save - count;
332 }
333
334 static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
335 size_t count, loff_t *offp)
336 {
337 int err = 0;
338 struct ubi_volume_desc *desc = file->private_data;
339 struct ubi_volume *vol = desc->vol;
340 struct ubi_device *ubi = vol->ubi;
341
342 if (!vol->updating && !vol->changing_leb)
343 return vol_cdev_direct_write(file, buf, count, offp);
344
345 if (vol->updating)
346 err = ubi_more_update_data(ubi, vol, buf, count);
347 else
348 err = ubi_more_leb_change_data(ubi, vol, buf, count);
349
350 if (err < 0) {
351 ubi_err("cannot accept more %zd bytes of data, error %d",
352 count, err);
353 return err;
354 }
355
356 if (err) {
357 /*
358 * The operation is finished, @err contains number of actually
359 * written bytes.
360 */
361 count = err;
362
363 if (vol->changing_leb) {
364 revoke_exclusive(desc, UBI_READWRITE);
365 return count;
366 }
367
368 err = ubi_check_volume(ubi, vol->vol_id);
369 if (err < 0)
370 return err;
371
372 if (err) {
373 ubi_warn("volume %d on UBI device %d is corrupted",
374 vol->vol_id, ubi->ubi_num);
375 vol->corrupted = 1;
376 }
377 vol->checked = 1;
378 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
379 revoke_exclusive(desc, UBI_READWRITE);
380 }
381
382 return count;
383 }
384
385 static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
386 unsigned long arg)
387 {
388 int err = 0;
389 struct ubi_volume_desc *desc = file->private_data;
390 struct ubi_volume *vol = desc->vol;
391 struct ubi_device *ubi = vol->ubi;
392 void __user *argp = (void __user *)arg;
393
394 switch (cmd) {
395 /* Volume update command */
396 case UBI_IOCVOLUP:
397 {
398 int64_t bytes, rsvd_bytes;
399
400 if (!capable(CAP_SYS_RESOURCE)) {
401 err = -EPERM;
402 break;
403 }
404
405 err = copy_from_user(&bytes, argp, sizeof(int64_t));
406 if (err) {
407 err = -EFAULT;
408 break;
409 }
410
411 if (desc->mode == UBI_READONLY) {
412 err = -EROFS;
413 break;
414 }
415
416 rsvd_bytes = (long long)vol->reserved_pebs *
417 ubi->leb_size-vol->data_pad;
418 if (bytes < 0 || bytes > rsvd_bytes) {
419 err = -EINVAL;
420 break;
421 }
422
423 err = get_exclusive(desc);
424 if (err < 0)
425 break;
426
427 err = ubi_start_update(ubi, vol, bytes);
428 if (bytes == 0)
429 revoke_exclusive(desc, UBI_READWRITE);
430 break;
431 }
432
433 /* Atomic logical eraseblock change command */
434 case UBI_IOCEBCH:
435 {
436 struct ubi_leb_change_req req;
437
438 err = copy_from_user(&req, argp,
439 sizeof(struct ubi_leb_change_req));
440 if (err) {
441 err = -EFAULT;
442 break;
443 }
444
445 if (desc->mode == UBI_READONLY ||
446 vol->vol_type == UBI_STATIC_VOLUME) {
447 err = -EROFS;
448 break;
449 }
450
451 /* Validate the request */
452 err = -EINVAL;
453 if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
454 req.bytes < 0 || req.lnum >= vol->usable_leb_size)
455 break;
456
457 err = get_exclusive(desc);
458 if (err < 0)
459 break;
460
461 err = ubi_start_leb_change(ubi, vol, &req);
462 if (req.bytes == 0)
463 revoke_exclusive(desc, UBI_READWRITE);
464 break;
465 }
466
467 /* Logical eraseblock erasure command */
468 case UBI_IOCEBER:
469 {
470 int32_t lnum;
471
472 err = get_user(lnum, (__user int32_t *)argp);
473 if (err) {
474 err = -EFAULT;
475 break;
476 }
477
478 if (desc->mode == UBI_READONLY ||
479 vol->vol_type == UBI_STATIC_VOLUME) {
480 err = -EROFS;
481 break;
482 }
483
484 if (lnum < 0 || lnum >= vol->reserved_pebs) {
485 err = -EINVAL;
486 break;
487 }
488
489 dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);
490 err = ubi_eba_unmap_leb(ubi, vol, lnum);
491 if (err)
492 break;
493
494 err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);
495 break;
496 }
497
498 /* Logical eraseblock map command */
499 case UBI_IOCEBMAP:
500 {
501 struct ubi_map_req req;
502
503 err = copy_from_user(&req, argp, sizeof(struct ubi_map_req));
504 if (err) {
505 err = -EFAULT;
506 break;
507 }
508 err = ubi_leb_map(desc, req.lnum);
509 break;
510 }
511
512 /* Logical eraseblock un-map command */
513 case UBI_IOCEBUNMAP:
514 {
515 int32_t lnum;
516
517 err = get_user(lnum, (__user int32_t *)argp);
518 if (err) {
519 err = -EFAULT;
520 break;
521 }
522 err = ubi_leb_unmap(desc, lnum);
523 break;
524 }
525
526 /* Check if logical eraseblock is mapped command */
527 case UBI_IOCEBISMAP:
528 {
529 int32_t lnum;
530
531 err = get_user(lnum, (__user int32_t *)argp);
532 if (err) {
533 err = -EFAULT;
534 break;
535 }
536 err = ubi_is_mapped(desc, lnum);
537 break;
538 }
539
540 /* Set volume property command */
541 case UBI_IOCSETVOLPROP:
542 {
543 struct ubi_set_vol_prop_req req;
544
545 err = copy_from_user(&req, argp,
546 sizeof(struct ubi_set_vol_prop_req));
547 if (err) {
548 err = -EFAULT;
549 break;
550 }
551 switch (req.property) {
552 case UBI_VOL_PROP_DIRECT_WRITE:
553 mutex_lock(&ubi->device_mutex);
554 desc->vol->direct_writes = !!req.value;
555 mutex_unlock(&ubi->device_mutex);
556 break;
557 default:
558 err = -EINVAL;
559 break;
560 }
561 break;
562 }
563
564 default:
565 err = -ENOTTY;
566 break;
567 }
568 return err;
569 }
570
571 /**
572 * verify_mkvol_req - verify volume creation request.
573 * @ubi: UBI device description object
574 * @req: the request to check
575 *
576 * This function zero if the request is correct, and %-EINVAL if not.
577 */
578 static int verify_mkvol_req(const struct ubi_device *ubi,
579 const struct ubi_mkvol_req *req)
580 {
581 int n, err = -EINVAL;
582
583 if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||
584 req->name_len < 0)
585 goto bad;
586
587 if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&
588 req->vol_id != UBI_VOL_NUM_AUTO)
589 goto bad;
590
591 if (req->alignment == 0)
592 goto bad;
593
594 if (req->bytes == 0)
595 goto bad;
596
597 if (req->vol_type != UBI_DYNAMIC_VOLUME &&
598 req->vol_type != UBI_STATIC_VOLUME)
599 goto bad;
600
601 if (req->alignment > ubi->leb_size)
602 goto bad;
603
604 n = req->alignment & (ubi->min_io_size - 1);
605 if (req->alignment != 1 && n)
606 goto bad;
607
608 if (!req->name[0] || !req->name_len)
609 goto bad;
610
611 if (req->name_len > UBI_VOL_NAME_MAX) {
612 err = -ENAMETOOLONG;
613 goto bad;
614 }
615
616 n = strnlen(req->name, req->name_len + 1);
617 if (n != req->name_len)
618 goto bad;
619
620 return 0;
621
622 bad:
623 ubi_err("bad volume creation request");
624 ubi_dump_mkvol_req(req);
625 return err;
626 }
627
628 /**
629 * verify_rsvol_req - verify volume re-size request.
630 * @ubi: UBI device description object
631 * @req: the request to check
632 *
633 * This function returns zero if the request is correct, and %-EINVAL if not.
634 */
635 static int verify_rsvol_req(const struct ubi_device *ubi,
636 const struct ubi_rsvol_req *req)
637 {
638 if (req->bytes <= 0)
639 return -EINVAL;
640
641 if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots)
642 return -EINVAL;
643
644 return 0;
645 }
646
647 /**
648 * rename_volumes - rename UBI volumes.
649 * @ubi: UBI device description object
650 * @req: volumes re-name request
651 *
652 * This is a helper function for the volume re-name IOCTL which validates the
653 * the request, opens the volume and calls corresponding volumes management
654 * function. Returns zero in case of success and a negative error code in case
655 * of failure.
656 */
657 static int rename_volumes(struct ubi_device *ubi,
658 struct ubi_rnvol_req *req)
659 {
660 int i, n, err;
661 struct list_head rename_list;
662 struct ubi_rename_entry *re, *re1;
663
664 if (req->count < 0 || req->count > UBI_MAX_RNVOL)
665 return -EINVAL;
666
667 if (req->count == 0)
668 return 0;
669
670 /* Validate volume IDs and names in the request */
671 for (i = 0; i < req->count; i++) {
672 if (req->ents[i].vol_id < 0 ||
673 req->ents[i].vol_id >= ubi->vtbl_slots)
674 return -EINVAL;
675 if (req->ents[i].name_len < 0)
676 return -EINVAL;
677 if (req->ents[i].name_len > UBI_VOL_NAME_MAX)
678 return -ENAMETOOLONG;
679 req->ents[i].name[req->ents[i].name_len] = '\0';
680 n = strlen(req->ents[i].name);
681 if (n != req->ents[i].name_len)
682 err = -EINVAL;
683 }
684
685 /* Make sure volume IDs and names are unique */
686 for (i = 0; i < req->count - 1; i++) {
687 for (n = i + 1; n < req->count; n++) {
688 if (req->ents[i].vol_id == req->ents[n].vol_id) {
689 ubi_err("duplicated volume id %d",
690 req->ents[i].vol_id);
691 return -EINVAL;
692 }
693 if (!strcmp(req->ents[i].name, req->ents[n].name)) {
694 ubi_err("duplicated volume name \"%s\"",
695 req->ents[i].name);
696 return -EINVAL;
697 }
698 }
699 }
700
701 /* Create the re-name list */
702 INIT_LIST_HEAD(&rename_list);
703 for (i = 0; i < req->count; i++) {
704 int vol_id = req->ents[i].vol_id;
705 int name_len = req->ents[i].name_len;
706 const char *name = req->ents[i].name;
707
708 re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
709 if (!re) {
710 err = -ENOMEM;
711 goto out_free;
712 }
713
714 re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
715 if (IS_ERR(re->desc)) {
716 err = PTR_ERR(re->desc);
717 ubi_err("cannot open volume %d, error %d", vol_id, err);
718 kfree(re);
719 goto out_free;
720 }
721
722 /* Skip this re-naming if the name does not really change */
723 if (re->desc->vol->name_len == name_len &&
724 !memcmp(re->desc->vol->name, name, name_len)) {
725 ubi_close_volume(re->desc);
726 kfree(re);
727 continue;
728 }
729
730 re->new_name_len = name_len;
731 memcpy(re->new_name, name, name_len);
732 list_add_tail(&re->list, &rename_list);
733 dbg_gen("will rename volume %d from \"%s\" to \"%s\"",
734 vol_id, re->desc->vol->name, name);
735 }
736
737 if (list_empty(&rename_list))
738 return 0;
739
740 /* Find out the volumes which have to be removed */
741 list_for_each_entry(re, &rename_list, list) {
742 struct ubi_volume_desc *desc;
743 int no_remove_needed = 0;
744
745 /*
746 * Volume @re->vol_id is going to be re-named to
747 * @re->new_name, while its current name is @name. If a volume
748 * with name @re->new_name currently exists, it has to be
749 * removed, unless it is also re-named in the request (@req).
750 */
751 list_for_each_entry(re1, &rename_list, list) {
752 if (re->new_name_len == re1->desc->vol->name_len &&
753 !memcmp(re->new_name, re1->desc->vol->name,
754 re1->desc->vol->name_len)) {
755 no_remove_needed = 1;
756 break;
757 }
758 }
759
760 if (no_remove_needed)
761 continue;
762
763 /*
764 * It seems we need to remove volume with name @re->new_name,
765 * if it exists.
766 */
767 desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name,
768 UBI_EXCLUSIVE);
769 if (IS_ERR(desc)) {
770 err = PTR_ERR(desc);
771 if (err == -ENODEV)
772 /* Re-naming into a non-existing volume name */
773 continue;
774
775 /* The volume exists but busy, or an error occurred */
776 ubi_err("cannot open volume \"%s\", error %d",
777 re->new_name, err);
778 goto out_free;
779 }
780
781 re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
782 if (!re1) {
783 err = -ENOMEM;
784 ubi_close_volume(desc);
785 goto out_free;
786 }
787
788 re1->remove = 1;
789 re1->desc = desc;
790 list_add(&re1->list, &rename_list);
791 dbg_gen("will remove volume %d, name \"%s\"",
792 re1->desc->vol->vol_id, re1->desc->vol->name);
793 }
794
795 mutex_lock(&ubi->device_mutex);
796 err = ubi_rename_volumes(ubi, &rename_list);
797 mutex_unlock(&ubi->device_mutex);
798
799 out_free:
800 list_for_each_entry_safe(re, re1, &rename_list, list) {
801 ubi_close_volume(re->desc);
802 list_del(&re->list);
803 kfree(re);
804 }
805 return err;
806 }
807
808 static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
809 unsigned long arg)
810 {
811 int err = 0;
812 struct ubi_device *ubi;
813 struct ubi_volume_desc *desc;
814 void __user *argp = (void __user *)arg;
815
816 if (!capable(CAP_SYS_RESOURCE))
817 return -EPERM;
818
819 ubi = ubi_get_by_major(imajor(file->f_mapping->host));
820 if (!ubi)
821 return -ENODEV;
822
823 switch (cmd) {
824 /* Create volume command */
825 case UBI_IOCMKVOL:
826 {
827 struct ubi_mkvol_req req;
828
829 dbg_gen("create volume");
830 err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
831 if (err) {
832 err = -EFAULT;
833 break;
834 }
835
836 err = verify_mkvol_req(ubi, &req);
837 if (err)
838 break;
839
840 mutex_lock(&ubi->device_mutex);
841 err = ubi_create_volume(ubi, &req);
842 mutex_unlock(&ubi->device_mutex);
843 if (err)
844 break;
845
846 err = put_user(req.vol_id, (__user int32_t *)argp);
847 if (err)
848 err = -EFAULT;
849
850 break;
851 }
852
853 /* Remove volume command */
854 case UBI_IOCRMVOL:
855 {
856 int vol_id;
857
858 dbg_gen("remove volume");
859 err = get_user(vol_id, (__user int32_t *)argp);
860 if (err) {
861 err = -EFAULT;
862 break;
863 }
864
865 desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
866 if (IS_ERR(desc)) {
867 err = PTR_ERR(desc);
868 break;
869 }
870
871 mutex_lock(&ubi->device_mutex);
872 err = ubi_remove_volume(desc, 0);
873 mutex_unlock(&ubi->device_mutex);
874
875 /*
876 * The volume is deleted (unless an error occurred), and the
877 * 'struct ubi_volume' object will be freed when
878 * 'ubi_close_volume()' will call 'put_device()'.
879 */
880 ubi_close_volume(desc);
881 break;
882 }
883
884 /* Re-size volume command */
885 case UBI_IOCRSVOL:
886 {
887 int pebs;
888 struct ubi_rsvol_req req;
889
890 dbg_gen("re-size volume");
891 err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
892 if (err) {
893 err = -EFAULT;
894 break;
895 }
896
897 err = verify_rsvol_req(ubi, &req);
898 if (err)
899 break;
900
901 desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);
902 if (IS_ERR(desc)) {
903 err = PTR_ERR(desc);
904 break;
905 }
906
907 pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,
908 desc->vol->usable_leb_size);
909
910 mutex_lock(&ubi->device_mutex);
911 err = ubi_resize_volume(desc, pebs);
912 mutex_unlock(&ubi->device_mutex);
913 ubi_close_volume(desc);
914 break;
915 }
916
917 /* Re-name volumes command */
918 case UBI_IOCRNVOL:
919 {
920 struct ubi_rnvol_req *req;
921
922 dbg_gen("re-name volumes");
923 req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
924 if (!req) {
925 err = -ENOMEM;
926 break;
927 };
928
929 err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));
930 if (err) {
931 err = -EFAULT;
932 kfree(req);
933 break;
934 }
935
936 err = rename_volumes(ubi, req);
937 kfree(req);
938 break;
939 }
940
941 default:
942 err = -ENOTTY;
943 break;
944 }
945
946 ubi_put_device(ubi);
947 return err;
948 }
949
950 static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
951 unsigned long arg)
952 {
953 int err = 0;
954 void __user *argp = (void __user *)arg;
955
956 if (!capable(CAP_SYS_RESOURCE))
957 return -EPERM;
958
959 switch (cmd) {
960 /* Attach an MTD device command */
961 case UBI_IOCATT:
962 {
963 struct ubi_attach_req req;
964 struct mtd_info *mtd;
965
966 dbg_gen("attach MTD device");
967 err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
968 if (err) {
969 err = -EFAULT;
970 break;
971 }
972
973 if (req.mtd_num < 0 ||
974 (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
975 err = -EINVAL;
976 break;
977 }
978
979 mtd = get_mtd_device(NULL, req.mtd_num);
980 if (IS_ERR(mtd)) {
981 err = PTR_ERR(mtd);
982 break;
983 }
984
985 /*
986 * Note, further request verification is done by
987 * 'ubi_attach_mtd_dev()'.
988 */
989 mutex_lock(&ubi_devices_mutex);
990 err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,
991 req.max_beb_per1024);
992 mutex_unlock(&ubi_devices_mutex);
993 if (err < 0)
994 put_mtd_device(mtd);
995 else
996 /* @err contains UBI device number */
997 err = put_user(err, (__user int32_t *)argp);
998
999 break;
1000 }
1001
1002 /* Detach an MTD device command */
1003 case UBI_IOCDET:
1004 {
1005 int ubi_num;
1006
1007 dbg_gen("detach MTD device");
1008 err = get_user(ubi_num, (__user int32_t *)argp);
1009 if (err) {
1010 err = -EFAULT;
1011 break;
1012 }
1013
1014 mutex_lock(&ubi_devices_mutex);
1015 err = ubi_detach_mtd_dev(ubi_num, 0);
1016 mutex_unlock(&ubi_devices_mutex);
1017 break;
1018 }
1019
1020 default:
1021 err = -ENOTTY;
1022 break;
1023 }
1024
1025 return err;
1026 }
1027
1028 #ifdef CONFIG_COMPAT
1029 static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1030 unsigned long arg)
1031 {
1032 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1033
1034 return vol_cdev_ioctl(file, cmd, translated_arg);
1035 }
1036
1037 static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1038 unsigned long arg)
1039 {
1040 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1041
1042 return ubi_cdev_ioctl(file, cmd, translated_arg);
1043 }
1044
1045 static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1046 unsigned long arg)
1047 {
1048 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1049
1050 return ctrl_cdev_ioctl(file, cmd, translated_arg);
1051 }
1052 #else
1053 #define vol_cdev_compat_ioctl NULL
1054 #define ubi_cdev_compat_ioctl NULL
1055 #define ctrl_cdev_compat_ioctl NULL
1056 #endif
1057
1058 /* UBI volume character device operations */
1059 const struct file_operations ubi_vol_cdev_operations = {
1060 .owner = THIS_MODULE,
1061 .open = vol_cdev_open,
1062 .release = vol_cdev_release,
1063 .llseek = vol_cdev_llseek,
1064 .read = vol_cdev_read,
1065 .write = vol_cdev_write,
1066 .fsync = vol_cdev_fsync,
1067 .unlocked_ioctl = vol_cdev_ioctl,
1068 .compat_ioctl = vol_cdev_compat_ioctl,
1069 };
1070
1071 /* UBI character device operations */
1072 const struct file_operations ubi_cdev_operations = {
1073 .owner = THIS_MODULE,
1074 .llseek = no_llseek,
1075 .unlocked_ioctl = ubi_cdev_ioctl,
1076 .compat_ioctl = ubi_cdev_compat_ioctl,
1077 };
1078
1079 /* UBI control character device operations */
1080 const struct file_operations ubi_ctrl_cdev_operations = {
1081 .owner = THIS_MODULE,
1082 .unlocked_ioctl = ctrl_cdev_ioctl,
1083 .compat_ioctl = ctrl_cdev_compat_ioctl,
1084 .llseek = no_llseek,
1085 };
Linux with added FPC-III support