blob: 45c329694a5e1479b8387da1eba1f57e5302f4d8 [file] [log] [blame]
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001/*
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.
Artem Bityutskiy9f961b52007-12-16 16:59:31 +020031 *
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.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040036 */
37
38#include <linux/module.h>
39#include <linux/stat.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040041#include <linux/ioctl.h>
42#include <linux/capability.h>
Artem Bityutskiy9c9ec142008-07-18 13:19:52 +030043#include <linux/uaccess.h>
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +020044#include <linux/compat.h>
Artem Bityutskiy3013ee32009-01-16 19:08:43 +020045#include <linux/math64.h>
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040046#include <mtd/ubi-user.h>
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040047#include "ubi.h"
48
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040049/**
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040050 * 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 */
Tanya Brokhman45fc5c82014-11-09 13:06:25 +020057static int get_exclusive(struct ubi_volume_desc *desc)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040058{
59 int users, err;
60 struct ubi_volume *vol = desc->vol;
61
62 spin_lock(&vol->ubi->volumes_lock);
Richard Weinbergerfafdd2b2014-11-24 22:30:09 +010063 users = vol->readers + vol->writers + vol->exclusive + vol->metaonly;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040064 ubi_assert(users > 0);
65 if (users > 1) {
Tanya Brokhman45fc5c82014-11-09 13:06:25 +020066 ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040067 err = -EBUSY;
68 } else {
Richard Weinbergerfafdd2b2014-11-24 22:30:09 +010069 vol->readers = vol->writers = vol->metaonly = 0;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040070 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);
Richard Weinbergerfafdd2b2014-11-24 22:30:09 +010089 ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040090 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;
Richard Weinbergerfafdd2b2014-11-24 22:30:09 +010096 else if (mode == UBI_METAONLY)
97 vol->metaonly = 1;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040098 else
99 vol->exclusive = 1;
100 spin_unlock(&vol->ubi->volumes_lock);
101
102 desc->mode = mode;
103}
104
105static int vol_cdev_open(struct inode *inode, struct file *file)
106{
107 struct ubi_volume_desc *desc;
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200108 int vol_id = iminor(inode) - 1, mode, ubi_num;
109
110 ubi_num = ubi_major2num(imajor(inode));
Artem Bityutskiy7d200e82008-08-31 19:32:13 +0300111 if (ubi_num < 0)
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200112 return ubi_num;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400113
114 if (file->f_mode & FMODE_WRITE)
115 mode = UBI_READWRITE;
116 else
117 mode = UBI_READONLY;
118
Artem Bityutskiye1cf7e62009-05-07 18:24:14 +0300119 dbg_gen("open device %d, volume %d, mode %d",
Artem Bityutskiyfeddbb32011-03-28 10:12:25 +0300120 ubi_num, vol_id, mode);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400121
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200122 desc = ubi_open_volume(ubi_num, vol_id, mode);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400123 if (IS_ERR(desc))
124 return PTR_ERR(desc);
125
126 file->private_data = desc;
127 return 0;
128}
129
130static 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
Artem Bityutskiye1cf7e62009-05-07 18:24:14 +0300135 dbg_gen("release device %d, volume %d, mode %d",
136 vol->ubi->ubi_num, vol->vol_id, desc->mode);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400137
138 if (vol->updating) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300139 ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged",
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400140 vol->vol_id);
Artem Bityutskiye6538792008-01-24 18:48:21 +0200141 ubi_assert(!vol->changing_leb);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400142 vol->updating = 0;
Artem Bityutskiy92ad8f32007-05-06 16:12:54 +0300143 vfree(vol->upd_buf);
Artem Bityutskiye6538792008-01-24 18:48:21 +0200144 } else if (vol->changing_leb) {
Artem Bityutskiy049333c2012-08-27 14:43:54 +0300145 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);
Artem Bityutskiye6538792008-01-24 18:48:21 +0200148 vol->changing_leb = 0;
149 vfree(vol->upd_buf);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400150 }
151
152 ubi_close_volume(desc);
153 return 0;
154}
155
156static 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;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400160
161 if (vol->updating) {
Artem Bityutskiyfeddbb32011-03-28 10:12:25 +0300162 /* Update is in progress, seeking is prohibited */
Tanya Brokhman326087032014-10-20 19:57:00 +0300163 ubi_err(vol->ubi, "updating");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400164 return -EBUSY;
165 }
166
Al Viro4a1f2f32013-06-23 12:30:24 +0400167 return fixed_size_llseek(file, offset, origin, vol->used_bytes);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400168}
169
Artem Bityutskiy049333c2012-08-27 14:43:54 +0300170static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,
171 int datasync)
Corentin Chary1b24bc32009-02-05 22:25:52 +0100172{
173 struct ubi_volume_desc *desc = file->private_data;
174 struct ubi_device *ubi = desc->vol->ubi;
Al Viro496ad9a2013-01-23 17:07:38 -0500175 struct inode *inode = file_inode(file);
Josef Bacik02c24a82011-07-16 20:44:56 -0400176 int err;
Al Viro59551022016-01-22 15:40:57 -0500177 inode_lock(inode);
Josef Bacik02c24a82011-07-16 20:44:56 -0400178 err = ubi_sync(ubi->ubi_num);
Al Viro59551022016-01-22 15:40:57 -0500179 inode_unlock(inode);
Josef Bacik02c24a82011-07-16 20:44:56 -0400180 return err;
Corentin Chary1b24bc32009-02-05 22:25:52 +0100181}
182
183
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400184static 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;
Artem Bityutskiyae616e12008-01-16 12:15:47 +0200190 int err, lnum, off, len, tbuf_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400191 size_t count_save = count;
192 void *tbuf;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400193
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300194 dbg_gen("read %zd bytes from offset %lld of volume %d",
Artem Bityutskiyae616e12008-01-16 12:15:47 +0200195 count, *offp, vol->vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400196
197 if (vol->updating) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300198 ubi_err(vol->ubi, "updating");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400199 return -EBUSY;
200 }
201 if (vol->upd_marker) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300202 ubi_err(vol->ubi, "damaged volume, update marker is set");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400203 return -EBADF;
204 }
205 if (*offp == vol->used_bytes || count == 0)
206 return 0;
207
208 if (vol->corrupted)
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300209 dbg_gen("read from corrupted volume %d", vol->vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400210
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);
Artem Bityutskiy92ad8f32007-05-06 16:12:54 +0300217 tbuf = vmalloc(tbuf_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400218 if (!tbuf)
219 return -ENOMEM;
220
221 len = count > tbuf_size ? tbuf_size : count;
Artem Bityutskiy3013ee32009-01-16 19:08:43 +0200222 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400223
224 do {
225 cond_resched();
226
227 if (off + len >= vol->usable_leb_size)
228 len = vol->usable_leb_size - off;
229
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200230 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400231 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
Artem Bityutskiy92ad8f32007-05-06 16:12:54 +0300253 vfree(tbuf);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400254 return err ? err : count_save - count;
255}
256
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400257/*
258 * This function allows to directly write to dynamic UBI volumes, without
Sidney Amani766fb952009-01-27 10:11:46 +0100259 * issuing the volume update operation.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400260 */
261static 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;
Artem Bityutskiyae616e12008-01-16 12:15:47 +0200267 int lnum, off, len, tbuf_size, err = 0;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400268 size_t count_save = count;
269 char *tbuf;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400270
Sidney Amani766fb952009-01-27 10:11:46 +0100271 if (!vol->direct_writes)
272 return -EPERM;
273
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300274 dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
Artem Bityutskiyae616e12008-01-16 12:15:47 +0200275 count, *offp, vol->vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400276
277 if (vol->vol_type == UBI_STATIC_VOLUME)
278 return -EROFS;
279
Artem Bityutskiy3013ee32009-01-16 19:08:43 +0200280 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
Kyungmin Parkcadb40c2008-05-22 10:32:18 +0900281 if (off & (ubi->min_io_size - 1)) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300282 ubi_err(ubi, "unaligned position");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400283 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 */
Kyungmin Parkcadb40c2008-05-22 10:32:18 +0900290 if (count & (ubi->min_io_size - 1)) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300291 ubi_err(ubi, "unaligned write length");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400292 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);
Artem Bityutskiy92ad8f32007-05-06 16:12:54 +0300298 tbuf = vmalloc(tbuf_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400299 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
Richard Weinbergerb36a2612012-05-14 17:55:51 +0200316 err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400317 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
Artem Bityutskiy92ad8f32007-05-06 16:12:54 +0300332 vfree(tbuf);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400333 return err ? err : count_save - count;
334}
335
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400336static 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
Artem Bityutskiye6538792008-01-24 18:48:21 +0200344 if (!vol->updating && !vol->changing_leb)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400345 return vol_cdev_direct_write(file, buf, count, offp);
346
Artem Bityutskiye6538792008-01-24 18:48:21 +0200347 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
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400352 if (err < 0) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300353 ubi_err(ubi, "cannot accept more %zd bytes of data, error %d",
Artem Bityutskiy01f7b302007-12-15 19:56:51 +0200354 count, err);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400355 return err;
356 }
357
358 if (err) {
359 /*
Artem Bityutskiye6538792008-01-24 18:48:21 +0200360 * The operation is finished, @err contains number of actually
361 * written bytes.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400362 */
363 count = err;
364
Artem Bityutskiye6538792008-01-24 18:48:21 +0200365 if (vol->changing_leb) {
366 revoke_exclusive(desc, UBI_READWRITE);
367 return count;
368 }
369
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400370 err = ubi_check_volume(ubi, vol->vol_id);
371 if (err < 0)
372 return err;
373
374 if (err) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300375 ubi_warn(ubi, "volume %d on UBI device %d is corrupted",
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400376 vol->vol_id, ubi->ubi_num);
377 vol->corrupted = 1;
378 }
379 vol->checked = 1;
Dmitry Pervushin0e0ee1c2009-04-29 19:29:38 +0400380 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400381 revoke_exclusive(desc, UBI_READWRITE);
382 }
383
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400384 return count;
385}
386
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +0200387static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
388 unsigned long arg)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400389{
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
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400396 switch (cmd) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400397 /* 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
Bruce Leonard73789a32008-07-03 10:35:49 +0300418 rsvd_bytes = (long long)vol->reserved_pebs *
Boris Brezillon5f09aaa2016-09-16 16:59:13 +0200419 vol->usable_leb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400420 if (bytes < 0 || bytes > rsvd_bytes) {
421 err = -EINVAL;
422 break;
423 }
424
Tanya Brokhman45fc5c82014-11-09 13:06:25 +0200425 err = get_exclusive(desc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400426 if (err < 0)
427 break;
428
Artem Bityutskiy1b68d0e2008-01-24 17:04:01 +0200429 err = ubi_start_update(ubi, vol, bytes);
Ezequiel Garciafda322a2014-08-29 18:42:30 -0300430 if (bytes == 0) {
431 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400432 revoke_exclusive(desc, UBI_READWRITE);
Ezequiel Garciafda322a2014-08-29 18:42:30 -0300433 }
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400434 break;
435 }
436
Artem Bityutskiye6538792008-01-24 18:48:21 +0200437 /* 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;
Boris Brezillon9a5f09a2016-09-16 16:59:22 +0200457 if (!ubi_leb_valid(vol, req.lnum) ||
Brian Norris299d0c52015-02-28 02:23:28 -0800458 req.bytes < 0 || req.bytes > vol->usable_leb_size)
Artem Bityutskiye6538792008-01-24 18:48:21 +0200459 break;
Artem Bityutskiye6538792008-01-24 18:48:21 +0200460
Tanya Brokhman45fc5c82014-11-09 13:06:25 +0200461 err = get_exclusive(desc);
Artem Bityutskiye6538792008-01-24 18:48:21 +0200462 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
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400471 /* Logical eraseblock erasure command */
472 case UBI_IOCEBER:
473 {
474 int32_t lnum;
475
Christoph Hellwigbf078032007-05-17 16:32:10 +0200476 err = get_user(lnum, (__user int32_t *)argp);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400477 if (err) {
478 err = -EFAULT;
479 break;
480 }
481
Artem Bityutskiye6538792008-01-24 18:48:21 +0200482 if (desc->mode == UBI_READONLY ||
483 vol->vol_type == UBI_STATIC_VOLUME) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400484 err = -EROFS;
485 break;
486 }
487
Boris Brezillon9a5f09a2016-09-16 16:59:22 +0200488 if (!ubi_leb_valid(vol, lnum)) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400489 err = -EINVAL;
490 break;
491 }
492
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300493 dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200494 err = ubi_eba_unmap_leb(ubi, vol, lnum);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400495 if (err)
496 break;
497
Joel Reardon62f384552012-05-20 21:27:11 +0200498 err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400499 break;
500 }
Corentin Chary141e6eb2009-01-05 14:44:11 +0100501
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 }
Richard Weinbergerb36a2612012-05-14 17:55:51 +0200512 err = ubi_leb_map(desc, req.lnum);
Corentin Chary141e6eb2009-01-05 14:44:11 +0100513 break;
514 }
Corentin Charyc3da23b2009-01-05 14:46:19 +0100515
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 }
Corentin Charya27ce8f2009-01-05 14:48:59 +0100529
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 }
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400543
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300544 /* Set volume property command */
Artem Bityutskiy67484822011-03-15 16:25:38 +0200545 case UBI_IOCSETVOLPROP:
Sidney Amani766fb952009-01-27 10:11:46 +0100546 {
Artem Bityutskiy67484822011-03-15 16:25:38 +0200547 struct ubi_set_vol_prop_req req;
Sidney Amani766fb952009-01-27 10:11:46 +0100548
549 err = copy_from_user(&req, argp,
Artem Bityutskiy67484822011-03-15 16:25:38 +0200550 sizeof(struct ubi_set_vol_prop_req));
Sidney Amani766fb952009-01-27 10:11:46 +0100551 if (err) {
552 err = -EFAULT;
553 break;
554 }
555 switch (req.property) {
Artem Bityutskiy67484822011-03-15 16:25:38 +0200556 case UBI_VOL_PROP_DIRECT_WRITE:
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300557 mutex_lock(&ubi->device_mutex);
Sidney Amani766fb952009-01-27 10:11:46 +0100558 desc->vol->direct_writes = !!req.value;
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300559 mutex_unlock(&ubi->device_mutex);
Sidney Amani766fb952009-01-27 10:11:46 +0100560 break;
561 default:
562 err = -EINVAL;
563 break;
564 }
565 break;
566 }
567
Artem Bityutskiy8af87182014-03-05 13:01:56 +0200568 /* Create a R/O block device on top of the UBI volume */
569 case UBI_IOCVOLCRBLK:
Ezequiel Garcia9d54c8a2014-02-25 13:25:22 -0300570 {
571 struct ubi_volume_info vi;
572
573 ubi_get_volume_info(desc, &vi);
Artem Bityutskiy4d283ee2014-03-04 12:00:26 +0200574 err = ubiblock_create(&vi);
Ezequiel Garcia9d54c8a2014-02-25 13:25:22 -0300575 break;
576 }
577
Artem Bityutskiy8af87182014-03-05 13:01:56 +0200578 /* Remove the R/O block device */
579 case UBI_IOCVOLRMBLK:
Ezequiel Garcia9d54c8a2014-02-25 13:25:22 -0300580 {
581 struct ubi_volume_info vi;
582
583 ubi_get_volume_info(desc, &vi);
Artem Bityutskiy4d283ee2014-03-04 12:00:26 +0200584 err = ubiblock_remove(&vi);
Ezequiel Garcia9d54c8a2014-02-25 13:25:22 -0300585 break;
586 }
587
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400588 default:
589 err = -ENOTTY;
590 break;
591 }
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400592 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 */
602static 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
Kyungmin Parkcadb40c2008-05-22 10:32:18 +0900628 n = req->alignment & (ubi->min_io_size - 1);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400629 if (req->alignment != 1 && n)
630 goto bad;
631
Richard Weinberger4a59c792012-01-13 15:07:40 +0100632 if (!req->name[0] || !req->name_len)
633 goto bad;
634
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400635 if (req->name_len > UBI_VOL_NAME_MAX) {
636 err = -ENAMETOOLONG;
637 goto bad;
638 }
639
Artem Bityutskiya6ea4402008-07-13 21:46:24 +0300640 n = strnlen(req->name, req->name_len + 1);
641 if (n != req->name_len)
642 goto bad;
643
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400644 return 0;
645
646bad:
Tanya Brokhman326087032014-10-20 19:57:00 +0300647 ubi_err(ubi, "bad volume creation request");
Artem Bityutskiy718c00b2012-05-16 18:03:32 +0300648 ubi_dump_mkvol_req(req);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400649 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 */
659static 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
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300671/**
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 */
681static 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)
Dan Carpenter7fbbd052014-09-19 13:56:56 +0300706 return -EINVAL;
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300707 }
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) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300713 ubi_err(ubi, "duplicated volume id %d",
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300714 req->ents[i].vol_id);
715 return -EINVAL;
716 }
717 if (!strcmp(req->ents[i].name, req->ents[n].name)) {
Tanya Brokhman326087032014-10-20 19:57:00 +0300718 ubi_err(ubi, "duplicated volume name \"%s\"",
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300719 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
Richard Weinberger892abde2014-11-24 22:30:10 +0100738 re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300739 if (IS_ERR(re->desc)) {
740 err = PTR_ERR(re->desc);
Tanya Brokhman326087032014-10-20 19:57:00 +0300741 ubi_err(ubi, "cannot open volume %d, error %d",
742 vol_id, err);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300743 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);
Artem Bityutskiy719bb842012-08-27 17:14:58 +0300758 dbg_gen("will rename volume %d from \"%s\" to \"%s\"",
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300759 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 */
Artem Bityutskiyf2863c52008-12-28 12:20:51 +0200792 desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name,
793 UBI_EXCLUSIVE);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300794 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 */
Tanya Brokhman326087032014-10-20 19:57:00 +0300801 ubi_err(ubi, "cannot open volume \"%s\", error %d",
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300802 re->new_name, err);
803 goto out_free;
804 }
805
Julia Lawall01ebc122010-08-07 11:09:29 +0200806 re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
807 if (!re1) {
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300808 err = -ENOMEM;
809 ubi_close_volume(desc);
810 goto out_free;
811 }
812
Julia Lawall01ebc122010-08-07 11:09:29 +0200813 re1->remove = 1;
814 re1->desc = desc;
815 list_add(&re1->list, &rename_list);
Artem Bityutskiy719bb842012-08-27 17:14:58 +0300816 dbg_gen("will remove volume %d, name \"%s\"",
Julia Lawall01ebc122010-08-07 11:09:29 +0200817 re1->desc->vol->vol_id, re1->desc->vol->name);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300818 }
819
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300820 mutex_lock(&ubi->device_mutex);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300821 err = ubi_rename_volumes(ubi, &rename_list);
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300822 mutex_unlock(&ubi->device_mutex);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300823
824out_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
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +0200833static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
834 unsigned long arg)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400835{
836 int err = 0;
837 struct ubi_device *ubi;
838 struct ubi_volume_desc *desc;
839 void __user *argp = (void __user *)arg;
840
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400841 if (!capable(CAP_SYS_RESOURCE))
842 return -EPERM;
843
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +0200844 ubi = ubi_get_by_major(imajor(file->f_mapping->host));
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200845 if (!ubi)
846 return -ENODEV;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400847
848 switch (cmd) {
849 /* Create volume command */
850 case UBI_IOCMKVOL:
851 {
852 struct ubi_mkvol_req req;
853
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300854 dbg_gen("create volume");
Artem Bityutskiy897a3162007-12-18 18:23:39 +0200855 err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400856 if (err) {
857 err = -EFAULT;
858 break;
859 }
860
861 err = verify_mkvol_req(ubi, &req);
862 if (err)
863 break;
864
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300865 mutex_lock(&ubi->device_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400866 err = ubi_create_volume(ubi, &req);
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300867 mutex_unlock(&ubi->device_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400868 if (err)
869 break;
870
Christoph Hellwigbf078032007-05-17 16:32:10 +0200871 err = put_user(req.vol_id, (__user int32_t *)argp);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400872 if (err)
873 err = -EFAULT;
874
875 break;
876 }
877
878 /* Remove volume command */
879 case UBI_IOCRMVOL:
880 {
881 int vol_id;
882
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300883 dbg_gen("remove volume");
Christoph Hellwigbf078032007-05-17 16:32:10 +0200884 err = get_user(vol_id, (__user int32_t *)argp);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400885 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
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300896 mutex_lock(&ubi->device_mutex);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300897 err = ubi_remove_volume(desc, 0);
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300898 mutex_unlock(&ubi->device_mutex);
Artem Bityutskiy40e4d0c2007-12-17 17:08:55 +0200899
Artem Bityutskiy450f8722007-12-17 13:09:09 +0200900 /*
Artem Bityutskiy40e4d0c2007-12-17 17:08:55 +0200901 * 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()'.
Artem Bityutskiy450f8722007-12-17 13:09:09 +0200904 */
905 ubi_close_volume(desc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400906 break;
907 }
908
909 /* Re-size volume command */
910 case UBI_IOCRSVOL:
911 {
912 int pebs;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400913 struct ubi_rsvol_req req;
914
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300915 dbg_gen("re-size volume");
Artem Bityutskiy897a3162007-12-18 18:23:39 +0200916 err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400917 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
Artem Bityutskiy3013ee32009-01-16 19:08:43 +0200932 pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,
933 desc->vol->usable_leb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400934
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300935 mutex_lock(&ubi->device_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400936 err = ubi_resize_volume(desc, pebs);
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300937 mutex_unlock(&ubi->device_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400938 ubi_close_volume(desc);
939 break;
940 }
941
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300942 /* Re-name volumes command */
943 case UBI_IOCRNVOL:
944 {
945 struct ubi_rnvol_req *req;
946
Artem Bityutskiy719bb842012-08-27 17:14:58 +0300947 dbg_gen("re-name volumes");
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300948 req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
949 if (!req) {
950 err = -ENOMEM;
951 break;
Richard Weinbergera396ce42015-10-19 22:26:43 +0200952 }
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300953
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
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300961 err = rename_volumes(ubi, req);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300962 kfree(req);
963 break;
964 }
965
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400966 default:
967 err = -ENOTTY;
968 break;
969 }
970
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200971 ubi_put_device(ubi);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400972 return err;
973}
974
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +0200975static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
976 unsigned long arg)
Artem Bityutskiy897a3162007-12-18 18:23:39 +0200977{
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
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300991 dbg_gen("attach MTD device");
Artem Bityutskiy897a3162007-12-18 18:23:39 +0200992 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);
Richard Genoud256334c2012-08-20 18:00:11 +02001015 err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,
Richard Genouddb7e21c2012-08-20 18:00:15 +02001016 req.max_beb_per1024);
Artem Bityutskiy897a3162007-12-18 18:23:39 +02001017 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
Peter Meerwald2ce7be12012-07-02 23:38:17 +02001032 dbg_gen("detach MTD device");
Artem Bityutskiy897a3162007-12-18 18:23:39 +02001033 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
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +02001053#ifdef CONFIG_COMPAT
1054static 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
1062static 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
1070static 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 */
1084const 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,
Corentin Chary1b24bc32009-02-05 22:25:52 +01001091 .fsync = vol_cdev_fsync,
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +02001092 .unlocked_ioctl = vol_cdev_ioctl,
1093 .compat_ioctl = vol_cdev_compat_ioctl,
Artem Bityutskiy9f961b52007-12-16 16:59:31 +02001094};
1095
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001096/* UBI character device operations */
Jan Engelhardt4d187a82009-01-11 23:55:39 +01001097const struct file_operations ubi_cdev_operations = {
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +02001098 .owner = THIS_MODULE,
1099 .llseek = no_llseek,
1100 .unlocked_ioctl = ubi_cdev_ioctl,
1101 .compat_ioctl = ubi_cdev_compat_ioctl,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001102};
1103
Artem Bityutskiyf429b2e2009-01-16 18:06:55 +02001104/* UBI control character device operations */
1105const struct file_operations ubi_ctrl_cdev_operations = {
1106 .owner = THIS_MODULE,
1107 .unlocked_ioctl = ctrl_cdev_ioctl,
1108 .compat_ioctl = ctrl_cdev_compat_ioctl,
Artem Bityutskiye10b3762011-03-21 16:50:18 +02001109 .llseek = no_llseek,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001110};