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Linux 4.1.16
[linux/fpc-iii.git] / drivers / mtd / ubi / cdev.c
blobd16fccf791791356b864dac759b654a20c7e6640
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 + vol->metaonly;
64 ubi_assert(users > 0);
65 if (users > 1) {
66 ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id);
67 err = -EBUSY;
68 } else {
69 vol->readers = vol->writers = vol->metaonly = 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 && vol->metaonly == 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 if (mode == UBI_METAONLY)
97 vol->metaonly = 1;
98 else
99 vol->exclusive = 1;
100 spin_unlock(&vol->ubi->volumes_lock);
101
102 desc->mode = mode;
103 }
104
105 static int vol_cdev_open(struct inode *inode, struct file *file)
106 {
107 struct ubi_volume_desc *desc;
108 int vol_id = iminor(inode) - 1, mode, ubi_num;
109
110 ubi_num = ubi_major2num(imajor(inode));
111 if (ubi_num < 0)
112 return ubi_num;
113
114 if (file->f_mode & FMODE_WRITE)
115 mode = UBI_READWRITE;
116 else
117 mode = UBI_READONLY;
118
119 dbg_gen("open device %d, volume %d, mode %d",
120 ubi_num, vol_id, mode);
121
122 desc = ubi_open_volume(ubi_num, vol_id, mode);
123 if (IS_ERR(desc))
124 return PTR_ERR(desc);
125
126 file->private_data = desc;
127 return 0;
128 }
129
130 static int vol_cdev_release(struct inode *inode, struct file *file)
131 {
132 struct ubi_volume_desc *desc = file->private_data;
133 struct ubi_volume *vol = desc->vol;
134
135 dbg_gen("release device %d, volume %d, mode %d",
136 vol->ubi->ubi_num, vol->vol_id, desc->mode);
137
138 if (vol->updating) {
139 ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged",
140 vol->vol_id);
141 ubi_assert(!vol->changing_leb);
142 vol->updating = 0;
143 vfree(vol->upd_buf);
144 } else if (vol->changing_leb) {
145 dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel",
146 vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num,
147 vol->vol_id);
148 vol->changing_leb = 0;
149 vfree(vol->upd_buf);
150 }
151
152 ubi_close_volume(desc);
153 return 0;
154 }
155
156 static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
157 {
158 struct ubi_volume_desc *desc = file->private_data;
159 struct ubi_volume *vol = desc->vol;
160
161 if (vol->updating) {
162 /* Update is in progress, seeking is prohibited */
163 ubi_err(vol->ubi, "updating");
164 return -EBUSY;
165 }
166
167 return fixed_size_llseek(file, offset, origin, vol->used_bytes);
168 }
169
170 static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,
171 int datasync)
172 {
173 struct ubi_volume_desc *desc = file->private_data;
174 struct ubi_device *ubi = desc->vol->ubi;
175 struct inode *inode = file_inode(file);
176 int err;
177 mutex_lock(&inode->i_mutex);
178 err = ubi_sync(ubi->ubi_num);
179 mutex_unlock(&inode->i_mutex);
180 return err;
181 }
182
183
184 static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
185 loff_t *offp)
186 {
187 struct ubi_volume_desc *desc = file->private_data;
188 struct ubi_volume *vol = desc->vol;
189 struct ubi_device *ubi = vol->ubi;
190 int err, lnum, off, len, tbuf_size;
191 size_t count_save = count;
192 void *tbuf;
193
194 dbg_gen("read %zd bytes from offset %lld of volume %d",
195 count, *offp, vol->vol_id);
196
197 if (vol->updating) {
198 ubi_err(vol->ubi, "updating");
199 return -EBUSY;
200 }
201 if (vol->upd_marker) {
202 ubi_err(vol->ubi, "damaged volume, update marker is set");
203 return -EBADF;
204 }
205 if (*offp == vol->used_bytes || count == 0)
206 return 0;
207
208 if (vol->corrupted)
209 dbg_gen("read from corrupted volume %d", vol->vol_id);
210
211 if (*offp + count > vol->used_bytes)
212 count_save = count = vol->used_bytes - *offp;
213
214 tbuf_size = vol->usable_leb_size;
215 if (count < tbuf_size)
216 tbuf_size = ALIGN(count, ubi->min_io_size);
217 tbuf = vmalloc(tbuf_size);
218 if (!tbuf)
219 return -ENOMEM;
220
221 len = count > tbuf_size ? tbuf_size : count;
222 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
223
224 do {
225 cond_resched();
226
227 if (off + len >= vol->usable_leb_size)
228 len = vol->usable_leb_size - off;
229
230 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
231 if (err)
232 break;
233
234 off += len;
235 if (off == vol->usable_leb_size) {
236 lnum += 1;
237 off -= vol->usable_leb_size;
238 }
239
240 count -= len;
241 *offp += len;
242
243 err = copy_to_user(buf, tbuf, len);
244 if (err) {
245 err = -EFAULT;
246 break;
247 }
248
249 buf += len;
250 len = count > tbuf_size ? tbuf_size : count;
251 } while (count);
252
253 vfree(tbuf);
254 return err ? err : count_save - count;
255 }
256
257 /*
258 * This function allows to directly write to dynamic UBI volumes, without
259 * issuing the volume update operation.
260 */
261 static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
262 size_t count, loff_t *offp)
263 {
264 struct ubi_volume_desc *desc = file->private_data;
265 struct ubi_volume *vol = desc->vol;
266 struct ubi_device *ubi = vol->ubi;
267 int lnum, off, len, tbuf_size, err = 0;
268 size_t count_save = count;
269 char *tbuf;
270
271 if (!vol->direct_writes)
272 return -EPERM;
273
274 dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
275 count, *offp, vol->vol_id);
276
277 if (vol->vol_type == UBI_STATIC_VOLUME)
278 return -EROFS;
279
280 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
281 if (off & (ubi->min_io_size - 1)) {
282 ubi_err(ubi, "unaligned position");
283 return -EINVAL;
284 }
285
286 if (*offp + count > vol->used_bytes)
287 count_save = count = vol->used_bytes - *offp;
288
289 /* We can write only in fractions of the minimum I/O unit */
290 if (count & (ubi->min_io_size - 1)) {
291 ubi_err(ubi, "unaligned write length");
292 return -EINVAL;
293 }
294
295 tbuf_size = vol->usable_leb_size;
296 if (count < tbuf_size)
297 tbuf_size = ALIGN(count, ubi->min_io_size);
298 tbuf = vmalloc(tbuf_size);
299 if (!tbuf)
300 return -ENOMEM;
301
302 len = count > tbuf_size ? tbuf_size : count;
303
304 while (count) {
305 cond_resched();
306
307 if (off + len >= vol->usable_leb_size)
308 len = vol->usable_leb_size - off;
309
310 err = copy_from_user(tbuf, buf, len);
311 if (err) {
312 err = -EFAULT;
313 break;
314 }
315
316 err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len);
317 if (err)
318 break;
319
320 off += len;
321 if (off == vol->usable_leb_size) {
322 lnum += 1;
323 off -= vol->usable_leb_size;
324 }
325
326 count -= len;
327 *offp += len;
328 buf += len;
329 len = count > tbuf_size ? tbuf_size : count;
330 }
331
332 vfree(tbuf);
333 return err ? err : count_save - count;
334 }
335
336 static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
337 size_t count, loff_t *offp)
338 {
339 int err = 0;
340 struct ubi_volume_desc *desc = file->private_data;
341 struct ubi_volume *vol = desc->vol;
342 struct ubi_device *ubi = vol->ubi;
343
344 if (!vol->updating && !vol->changing_leb)
345 return vol_cdev_direct_write(file, buf, count, offp);
346
347 if (vol->updating)
348 err = ubi_more_update_data(ubi, vol, buf, count);
349 else
350 err = ubi_more_leb_change_data(ubi, vol, buf, count);
351
352 if (err < 0) {
353 ubi_err(ubi, "cannot accept more %zd bytes of data, error %d",
354 count, err);
355 return err;
356 }
357
358 if (err) {
359 /*
360 * The operation is finished, @err contains number of actually
361 * written bytes.
362 */
363 count = err;
364
365 if (vol->changing_leb) {
366 revoke_exclusive(desc, UBI_READWRITE);
367 return count;
368 }
369
370 err = ubi_check_volume(ubi, vol->vol_id);
371 if (err < 0)
372 return err;
373
374 if (err) {
375 ubi_warn(ubi, "volume %d on UBI device %d is corrupted",
376 vol->vol_id, ubi->ubi_num);
377 vol->corrupted = 1;
378 }
379 vol->checked = 1;
380 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
381 revoke_exclusive(desc, UBI_READWRITE);
382 }
383
384 return count;
385 }
386
387 static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
388 unsigned long arg)
389 {
390 int err = 0;
391 struct ubi_volume_desc *desc = file->private_data;
392 struct ubi_volume *vol = desc->vol;
393 struct ubi_device *ubi = vol->ubi;
394 void __user *argp = (void __user *)arg;
395
396 switch (cmd) {
397 /* Volume update command */
398 case UBI_IOCVOLUP:
399 {
400 int64_t bytes, rsvd_bytes;
401
402 if (!capable(CAP_SYS_RESOURCE)) {
403 err = -EPERM;
404 break;
405 }
406
407 err = copy_from_user(&bytes, argp, sizeof(int64_t));
408 if (err) {
409 err = -EFAULT;
410 break;
411 }
412
413 if (desc->mode == UBI_READONLY) {
414 err = -EROFS;
415 break;
416 }
417
418 rsvd_bytes = (long long)vol->reserved_pebs *
419 ubi->leb_size-vol->data_pad;
420 if (bytes < 0 || bytes > rsvd_bytes) {
421 err = -EINVAL;
422 break;
423 }
424
425 err = get_exclusive(desc);
426 if (err < 0)
427 break;
428
429 err = ubi_start_update(ubi, vol, bytes);
430 if (bytes == 0) {
431 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
432 revoke_exclusive(desc, UBI_READWRITE);
433 }
434 break;
435 }
436
437 /* Atomic logical eraseblock change command */
438 case UBI_IOCEBCH:
439 {
440 struct ubi_leb_change_req req;
441
442 err = copy_from_user(&req, argp,
443 sizeof(struct ubi_leb_change_req));
444 if (err) {
445 err = -EFAULT;
446 break;
447 }
448
449 if (desc->mode == UBI_READONLY ||
450 vol->vol_type == UBI_STATIC_VOLUME) {
451 err = -EROFS;
452 break;
453 }
454
455 /* Validate the request */
456 err = -EINVAL;
457 if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
458 req.bytes < 0 || req.bytes > vol->usable_leb_size)
459 break;
460
461 err = get_exclusive(desc);
462 if (err < 0)
463 break;
464
465 err = ubi_start_leb_change(ubi, vol, &req);
466 if (req.bytes == 0)
467 revoke_exclusive(desc, UBI_READWRITE);
468 break;
469 }
470
471 /* Logical eraseblock erasure command */
472 case UBI_IOCEBER:
473 {
474 int32_t lnum;
475
476 err = get_user(lnum, (__user int32_t *)argp);
477 if (err) {
478 err = -EFAULT;
479 break;
480 }
481
482 if (desc->mode == UBI_READONLY ||
483 vol->vol_type == UBI_STATIC_VOLUME) {
484 err = -EROFS;
485 break;
486 }
487
488 if (lnum < 0 || lnum >= vol->reserved_pebs) {
489 err = -EINVAL;
490 break;
491 }
492
493 dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);
494 err = ubi_eba_unmap_leb(ubi, vol, lnum);
495 if (err)
496 break;
497
498 err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);
499 break;
500 }
501
502 /* Logical eraseblock map command */
503 case UBI_IOCEBMAP:
504 {
505 struct ubi_map_req req;
506
507 err = copy_from_user(&req, argp, sizeof(struct ubi_map_req));
508 if (err) {
509 err = -EFAULT;
510 break;
511 }
512 err = ubi_leb_map(desc, req.lnum);
513 break;
514 }
515
516 /* Logical eraseblock un-map command */
517 case UBI_IOCEBUNMAP:
518 {
519 int32_t lnum;
520
521 err = get_user(lnum, (__user int32_t *)argp);
522 if (err) {
523 err = -EFAULT;
524 break;
525 }
526 err = ubi_leb_unmap(desc, lnum);
527 break;
528 }
529
530 /* Check if logical eraseblock is mapped command */
531 case UBI_IOCEBISMAP:
532 {
533 int32_t lnum;
534
535 err = get_user(lnum, (__user int32_t *)argp);
536 if (err) {
537 err = -EFAULT;
538 break;
539 }
540 err = ubi_is_mapped(desc, lnum);
541 break;
542 }
543
544 /* Set volume property command */
545 case UBI_IOCSETVOLPROP:
546 {
547 struct ubi_set_vol_prop_req req;
548
549 err = copy_from_user(&req, argp,
550 sizeof(struct ubi_set_vol_prop_req));
551 if (err) {
552 err = -EFAULT;
553 break;
554 }
555 switch (req.property) {
556 case UBI_VOL_PROP_DIRECT_WRITE:
557 mutex_lock(&ubi->device_mutex);
558 desc->vol->direct_writes = !!req.value;
559 mutex_unlock(&ubi->device_mutex);
560 break;
561 default:
562 err = -EINVAL;
563 break;
564 }
565 break;
566 }
567
568 /* Create a R/O block device on top of the UBI volume */
569 case UBI_IOCVOLCRBLK:
570 {
571 struct ubi_volume_info vi;
572
573 ubi_get_volume_info(desc, &vi);
574 err = ubiblock_create(&vi);
575 break;
576 }
577
578 /* Remove the R/O block device */
579 case UBI_IOCVOLRMBLK:
580 {
581 struct ubi_volume_info vi;
582
583 ubi_get_volume_info(desc, &vi);
584 err = ubiblock_remove(&vi);
585 break;
586 }
587
588 default:
589 err = -ENOTTY;
590 break;
591 }
592 return err;
593 }
594
595 /**
596 * verify_mkvol_req - verify volume creation request.
597 * @ubi: UBI device description object
598 * @req: the request to check
599 *
600 * This function zero if the request is correct, and %-EINVAL if not.
601 */
602 static int verify_mkvol_req(const struct ubi_device *ubi,
603 const struct ubi_mkvol_req *req)
604 {
605 int n, err = -EINVAL;
606
607 if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||
608 req->name_len < 0)
609 goto bad;
610
611 if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&
612 req->vol_id != UBI_VOL_NUM_AUTO)
613 goto bad;
614
615 if (req->alignment == 0)
616 goto bad;
617
618 if (req->bytes == 0)
619 goto bad;
620
621 if (req->vol_type != UBI_DYNAMIC_VOLUME &&
622 req->vol_type != UBI_STATIC_VOLUME)
623 goto bad;
624
625 if (req->alignment > ubi->leb_size)
626 goto bad;
627
628 n = req->alignment & (ubi->min_io_size - 1);
629 if (req->alignment != 1 && n)
630 goto bad;
631
632 if (!req->name[0] || !req->name_len)
633 goto bad;
634
635 if (req->name_len > UBI_VOL_NAME_MAX) {
636 err = -ENAMETOOLONG;
637 goto bad;
638 }
639
640 n = strnlen(req->name, req->name_len + 1);
641 if (n != req->name_len)
642 goto bad;
643
644 return 0;
645
646 bad:
647 ubi_err(ubi, "bad volume creation request");
648 ubi_dump_mkvol_req(req);
649 return err;
650 }
651
652 /**
653 * verify_rsvol_req - verify volume re-size request.
654 * @ubi: UBI device description object
655 * @req: the request to check
656 *
657 * This function returns zero if the request is correct, and %-EINVAL if not.
658 */
659 static int verify_rsvol_req(const struct ubi_device *ubi,
660 const struct ubi_rsvol_req *req)
661 {
662 if (req->bytes <= 0)
663 return -EINVAL;
664
665 if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots)
666 return -EINVAL;
667
668 return 0;
669 }
670
671 /**
672 * rename_volumes - rename UBI volumes.
673 * @ubi: UBI device description object
674 * @req: volumes re-name request
675 *
676 * This is a helper function for the volume re-name IOCTL which validates the
677 * the request, opens the volume and calls corresponding volumes management
678 * function. Returns zero in case of success and a negative error code in case
679 * of failure.
680 */
681 static int rename_volumes(struct ubi_device *ubi,
682 struct ubi_rnvol_req *req)
683 {
684 int i, n, err;
685 struct list_head rename_list;
686 struct ubi_rename_entry *re, *re1;
687
688 if (req->count < 0 || req->count > UBI_MAX_RNVOL)
689 return -EINVAL;
690
691 if (req->count == 0)
692 return 0;
693
694 /* Validate volume IDs and names in the request */
695 for (i = 0; i < req->count; i++) {
696 if (req->ents[i].vol_id < 0 ||
697 req->ents[i].vol_id >= ubi->vtbl_slots)
698 return -EINVAL;
699 if (req->ents[i].name_len < 0)
700 return -EINVAL;
701 if (req->ents[i].name_len > UBI_VOL_NAME_MAX)
702 return -ENAMETOOLONG;
703 req->ents[i].name[req->ents[i].name_len] = '\0';
704 n = strlen(req->ents[i].name);
705 if (n != req->ents[i].name_len)
706 return -EINVAL;
707 }
708
709 /* Make sure volume IDs and names are unique */
710 for (i = 0; i < req->count - 1; i++) {
711 for (n = i + 1; n < req->count; n++) {
712 if (req->ents[i].vol_id == req->ents[n].vol_id) {
713 ubi_err(ubi, "duplicated volume id %d",
714 req->ents[i].vol_id);
715 return -EINVAL;
716 }
717 if (!strcmp(req->ents[i].name, req->ents[n].name)) {
718 ubi_err(ubi, "duplicated volume name \"%s\"",
719 req->ents[i].name);
720 return -EINVAL;
721 }
722 }
723 }
724
725 /* Create the re-name list */
726 INIT_LIST_HEAD(&rename_list);
727 for (i = 0; i < req->count; i++) {
728 int vol_id = req->ents[i].vol_id;
729 int name_len = req->ents[i].name_len;
730 const char *name = req->ents[i].name;
731
732 re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
733 if (!re) {
734 err = -ENOMEM;
735 goto out_free;
736 }
737
738 re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY);
739 if (IS_ERR(re->desc)) {
740 err = PTR_ERR(re->desc);
741 ubi_err(ubi, "cannot open volume %d, error %d",
742 vol_id, err);
743 kfree(re);
744 goto out_free;
745 }
746
747 /* Skip this re-naming if the name does not really change */
748 if (re->desc->vol->name_len == name_len &&
749 !memcmp(re->desc->vol->name, name, name_len)) {
750 ubi_close_volume(re->desc);
751 kfree(re);
752 continue;
753 }
754
755 re->new_name_len = name_len;
756 memcpy(re->new_name, name, name_len);
757 list_add_tail(&re->list, &rename_list);
758 dbg_gen("will rename volume %d from \"%s\" to \"%s\"",
759 vol_id, re->desc->vol->name, name);
760 }
761
762 if (list_empty(&rename_list))
763 return 0;
764
765 /* Find out the volumes which have to be removed */
766 list_for_each_entry(re, &rename_list, list) {
767 struct ubi_volume_desc *desc;
768 int no_remove_needed = 0;
769
770 /*
771 * Volume @re->vol_id is going to be re-named to
772 * @re->new_name, while its current name is @name. If a volume
773 * with name @re->new_name currently exists, it has to be
774 * removed, unless it is also re-named in the request (@req).
775 */
776 list_for_each_entry(re1, &rename_list, list) {
777 if (re->new_name_len == re1->desc->vol->name_len &&
778 !memcmp(re->new_name, re1->desc->vol->name,
779 re1->desc->vol->name_len)) {
780 no_remove_needed = 1;
781 break;
782 }
783 }
784
785 if (no_remove_needed)
786 continue;
787
788 /*
789 * It seems we need to remove volume with name @re->new_name,
790 * if it exists.
791 */
792 desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name,
793 UBI_EXCLUSIVE);
794 if (IS_ERR(desc)) {
795 err = PTR_ERR(desc);
796 if (err == -ENODEV)
797 /* Re-naming into a non-existing volume name */
798 continue;
799
800 /* The volume exists but busy, or an error occurred */
801 ubi_err(ubi, "cannot open volume \"%s\", error %d",
802 re->new_name, err);
803 goto out_free;
804 }
805
806 re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
807 if (!re1) {
808 err = -ENOMEM;
809 ubi_close_volume(desc);
810 goto out_free;
811 }
812
813 re1->remove = 1;
814 re1->desc = desc;
815 list_add(&re1->list, &rename_list);
816 dbg_gen("will remove volume %d, name \"%s\"",
817 re1->desc->vol->vol_id, re1->desc->vol->name);
818 }
819
820 mutex_lock(&ubi->device_mutex);
821 err = ubi_rename_volumes(ubi, &rename_list);
822 mutex_unlock(&ubi->device_mutex);
823
824 out_free:
825 list_for_each_entry_safe(re, re1, &rename_list, list) {
826 ubi_close_volume(re->desc);
827 list_del(&re->list);
828 kfree(re);
829 }
830 return err;
831 }
832
833 static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
834 unsigned long arg)
835 {
836 int err = 0;
837 struct ubi_device *ubi;
838 struct ubi_volume_desc *desc;
839 void __user *argp = (void __user *)arg;
840
841 if (!capable(CAP_SYS_RESOURCE))
842 return -EPERM;
843
844 ubi = ubi_get_by_major(imajor(file->f_mapping->host));
845 if (!ubi)
846 return -ENODEV;
847
848 switch (cmd) {
849 /* Create volume command */
850 case UBI_IOCMKVOL:
851 {
852 struct ubi_mkvol_req req;
853
854 dbg_gen("create volume");
855 err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
856 if (err) {
857 err = -EFAULT;
858 break;
859 }
860
861 err = verify_mkvol_req(ubi, &req);
862 if (err)
863 break;
864
865 mutex_lock(&ubi->device_mutex);
866 err = ubi_create_volume(ubi, &req);
867 mutex_unlock(&ubi->device_mutex);
868 if (err)
869 break;
870
871 err = put_user(req.vol_id, (__user int32_t *)argp);
872 if (err)
873 err = -EFAULT;
874
875 break;
876 }
877
878 /* Remove volume command */
879 case UBI_IOCRMVOL:
880 {
881 int vol_id;
882
883 dbg_gen("remove volume");
884 err = get_user(vol_id, (__user int32_t *)argp);
885 if (err) {
886 err = -EFAULT;
887 break;
888 }
889
890 desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
891 if (IS_ERR(desc)) {
892 err = PTR_ERR(desc);
893 break;
894 }
895
896 mutex_lock(&ubi->device_mutex);
897 err = ubi_remove_volume(desc, 0);
898 mutex_unlock(&ubi->device_mutex);
899
900 /*
901 * The volume is deleted (unless an error occurred), and the
902 * 'struct ubi_volume' object will be freed when
903 * 'ubi_close_volume()' will call 'put_device()'.
904 */
905 ubi_close_volume(desc);
906 break;
907 }
908
909 /* Re-size volume command */
910 case UBI_IOCRSVOL:
911 {
912 int pebs;
913 struct ubi_rsvol_req req;
914
915 dbg_gen("re-size volume");
916 err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
917 if (err) {
918 err = -EFAULT;
919 break;
920 }
921
922 err = verify_rsvol_req(ubi, &req);
923 if (err)
924 break;
925
926 desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);
927 if (IS_ERR(desc)) {
928 err = PTR_ERR(desc);
929 break;
930 }
931
932 pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,
933 desc->vol->usable_leb_size);
934
935 mutex_lock(&ubi->device_mutex);
936 err = ubi_resize_volume(desc, pebs);
937 mutex_unlock(&ubi->device_mutex);
938 ubi_close_volume(desc);
939 break;
940 }
941
942 /* Re-name volumes command */
943 case UBI_IOCRNVOL:
944 {
945 struct ubi_rnvol_req *req;
946
947 dbg_gen("re-name volumes");
948 req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
949 if (!req) {
950 err = -ENOMEM;
951 break;
952 };
953
954 err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));
955 if (err) {
956 err = -EFAULT;
957 kfree(req);
958 break;
959 }
960
961 err = rename_volumes(ubi, req);
962 kfree(req);
963 break;
964 }
965
966 default:
967 err = -ENOTTY;
968 break;
969 }
970
971 ubi_put_device(ubi);
972 return err;
973 }
974
975 static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
976 unsigned long arg)
977 {
978 int err = 0;
979 void __user *argp = (void __user *)arg;
980
981 if (!capable(CAP_SYS_RESOURCE))
982 return -EPERM;
983
984 switch (cmd) {
985 /* Attach an MTD device command */
986 case UBI_IOCATT:
987 {
988 struct ubi_attach_req req;
989 struct mtd_info *mtd;
990
991 dbg_gen("attach MTD device");
992 err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
993 if (err) {
994 err = -EFAULT;
995 break;
996 }
997
998 if (req.mtd_num < 0 ||
999 (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
1000 err = -EINVAL;
1001 break;
1002 }
1003
1004 mtd = get_mtd_device(NULL, req.mtd_num);
1005 if (IS_ERR(mtd)) {
1006 err = PTR_ERR(mtd);
1007 break;
1008 }
1009
1010 /*
1011 * Note, further request verification is done by
1012 * 'ubi_attach_mtd_dev()'.
1013 */
1014 mutex_lock(&ubi_devices_mutex);
1015 err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,
1016 req.max_beb_per1024);
1017 mutex_unlock(&ubi_devices_mutex);
1018 if (err < 0)
1019 put_mtd_device(mtd);
1020 else
1021 /* @err contains UBI device number */
1022 err = put_user(err, (__user int32_t *)argp);
1023
1024 break;
1025 }
1026
1027 /* Detach an MTD device command */
1028 case UBI_IOCDET:
1029 {
1030 int ubi_num;
1031
1032 dbg_gen("detach MTD device");
1033 err = get_user(ubi_num, (__user int32_t *)argp);
1034 if (err) {
1035 err = -EFAULT;
1036 break;
1037 }
1038
1039 mutex_lock(&ubi_devices_mutex);
1040 err = ubi_detach_mtd_dev(ubi_num, 0);
1041 mutex_unlock(&ubi_devices_mutex);
1042 break;
1043 }
1044
1045 default:
1046 err = -ENOTTY;
1047 break;
1048 }
1049
1050 return err;
1051 }
1052
1053 #ifdef CONFIG_COMPAT
1054 static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1055 unsigned long arg)
1056 {
1057 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1058
1059 return vol_cdev_ioctl(file, cmd, translated_arg);
1060 }
1061
1062 static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1063 unsigned long arg)
1064 {
1065 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1066
1067 return ubi_cdev_ioctl(file, cmd, translated_arg);
1068 }
1069
1070 static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1071 unsigned long arg)
1072 {
1073 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1074
1075 return ctrl_cdev_ioctl(file, cmd, translated_arg);
1076 }
1077 #else
1078 #define vol_cdev_compat_ioctl NULL
1079 #define ubi_cdev_compat_ioctl NULL
1080 #define ctrl_cdev_compat_ioctl NULL
1081 #endif
1082
1083 /* UBI volume character device operations */
1084 const struct file_operations ubi_vol_cdev_operations = {
1085 .owner = THIS_MODULE,
1086 .open = vol_cdev_open,
1087 .release = vol_cdev_release,
1088 .llseek = vol_cdev_llseek,
1089 .read = vol_cdev_read,
1090 .write = vol_cdev_write,
1091 .fsync = vol_cdev_fsync,
1092 .unlocked_ioctl = vol_cdev_ioctl,
1093 .compat_ioctl = vol_cdev_compat_ioctl,
1094 };
1095
1096 /* UBI character device operations */
1097 const struct file_operations ubi_cdev_operations = {
1098 .owner = THIS_MODULE,
1099 .llseek = no_llseek,
1100 .unlocked_ioctl = ubi_cdev_ioctl,
1101 .compat_ioctl = ubi_cdev_compat_ioctl,
1102 };
1103
1104 /* UBI control character device operations */
1105 const struct file_operations ubi_ctrl_cdev_operations = {
1106 .owner = THIS_MODULE,
1107 .unlocked_ioctl = ctrl_cdev_ioctl,
1108 .compat_ioctl = ctrl_cdev_compat_ioctl,
1109 .llseek = no_llseek,
1110 };
Linux with added FPC-III support