Commit | Line | Data |
---|---|---|
801c135c AB |
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. | |
9f961b57 AB |
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. | |
801c135c AB |
36 | */ |
37 | ||
38 | #include <linux/module.h> | |
39 | #include <linux/stat.h> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
801c135c AB |
41 | #include <linux/ioctl.h> |
42 | #include <linux/capability.h> | |
9c9ec147 | 43 | #include <linux/uaccess.h> |
f429b2ea | 44 | #include <linux/compat.h> |
3013ee31 | 45 | #include <linux/math64.h> |
801c135c | 46 | #include <mtd/ubi-user.h> |
801c135c AB |
47 | #include "ubi.h" |
48 | ||
801c135c AB |
49 | /** |
50 | * get_exclusive - get exclusive access to an UBI volume. | |
32608703 | 51 | * @ubi: UBI device description object |
801c135c AB |
52 | * @desc: volume descriptor |
53 | * | |
54 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
55 | * mode value (positive integer) in case of success and a negative error code | |
56 | * in case of failure. | |
57 | */ | |
32608703 | 58 | static int get_exclusive(struct ubi_device *ubi, struct ubi_volume_desc *desc) |
801c135c AB |
59 | { |
60 | int users, err; | |
61 | struct ubi_volume *vol = desc->vol; | |
62 | ||
63 | spin_lock(&vol->ubi->volumes_lock); | |
fafdd2bf | 64 | users = vol->readers + vol->writers + vol->exclusive + vol->metaonly; |
801c135c AB |
65 | ubi_assert(users > 0); |
66 | if (users > 1) { | |
32608703 | 67 | ubi_err(ubi, "%d users for volume %d", users, vol->vol_id); |
801c135c AB |
68 | err = -EBUSY; |
69 | } else { | |
fafdd2bf | 70 | vol->readers = vol->writers = vol->metaonly = 0; |
801c135c AB |
71 | vol->exclusive = 1; |
72 | err = desc->mode; | |
73 | desc->mode = UBI_EXCLUSIVE; | |
74 | } | |
75 | spin_unlock(&vol->ubi->volumes_lock); | |
76 | ||
77 | return err; | |
78 | } | |
79 | ||
80 | /** | |
81 | * revoke_exclusive - revoke exclusive mode. | |
82 | * @desc: volume descriptor | |
83 | * @mode: new mode to switch to | |
84 | */ | |
85 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
86 | { | |
87 | struct ubi_volume *vol = desc->vol; | |
88 | ||
89 | spin_lock(&vol->ubi->volumes_lock); | |
fafdd2bf | 90 | ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0); |
801c135c AB |
91 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); |
92 | vol->exclusive = 0; | |
93 | if (mode == UBI_READONLY) | |
94 | vol->readers = 1; | |
95 | else if (mode == UBI_READWRITE) | |
96 | vol->writers = 1; | |
fafdd2bf RW |
97 | else if (mode == UBI_METAONLY) |
98 | vol->metaonly = 1; | |
801c135c AB |
99 | else |
100 | vol->exclusive = 1; | |
101 | spin_unlock(&vol->ubi->volumes_lock); | |
102 | ||
103 | desc->mode = mode; | |
104 | } | |
105 | ||
106 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
107 | { | |
108 | struct ubi_volume_desc *desc; | |
e73f4459 AB |
109 | int vol_id = iminor(inode) - 1, mode, ubi_num; |
110 | ||
111 | ubi_num = ubi_major2num(imajor(inode)); | |
7d200e88 | 112 | if (ubi_num < 0) |
e73f4459 | 113 | return ubi_num; |
801c135c AB |
114 | |
115 | if (file->f_mode & FMODE_WRITE) | |
116 | mode = UBI_READWRITE; | |
117 | else | |
118 | mode = UBI_READONLY; | |
119 | ||
e1cf7e6d | 120 | dbg_gen("open device %d, volume %d, mode %d", |
feddbb34 | 121 | ubi_num, vol_id, mode); |
801c135c | 122 | |
e73f4459 | 123 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
801c135c AB |
124 | if (IS_ERR(desc)) |
125 | return PTR_ERR(desc); | |
126 | ||
127 | file->private_data = desc; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
132 | { | |
133 | struct ubi_volume_desc *desc = file->private_data; | |
134 | struct ubi_volume *vol = desc->vol; | |
135 | ||
e1cf7e6d AB |
136 | dbg_gen("release device %d, volume %d, mode %d", |
137 | vol->ubi->ubi_num, vol->vol_id, desc->mode); | |
801c135c AB |
138 | |
139 | if (vol->updating) { | |
32608703 | 140 | ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged", |
801c135c | 141 | vol->vol_id); |
e653879c | 142 | ubi_assert(!vol->changing_leb); |
801c135c | 143 | vol->updating = 0; |
92ad8f37 | 144 | vfree(vol->upd_buf); |
e653879c | 145 | } else if (vol->changing_leb) { |
049333ce AB |
146 | dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", |
147 | vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, | |
148 | vol->vol_id); | |
e653879c AB |
149 | vol->changing_leb = 0; |
150 | vfree(vol->upd_buf); | |
801c135c AB |
151 | } |
152 | ||
153 | ubi_close_volume(desc); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
158 | { | |
159 | struct ubi_volume_desc *desc = file->private_data; | |
160 | struct ubi_volume *vol = desc->vol; | |
801c135c AB |
161 | |
162 | if (vol->updating) { | |
feddbb34 | 163 | /* Update is in progress, seeking is prohibited */ |
32608703 | 164 | ubi_err(vol->ubi, "updating"); |
801c135c AB |
165 | return -EBUSY; |
166 | } | |
167 | ||
4a1f2f38 | 168 | return fixed_size_llseek(file, offset, origin, vol->used_bytes); |
801c135c AB |
169 | } |
170 | ||
049333ce AB |
171 | static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, |
172 | int datasync) | |
1b24bc3a CC |
173 | { |
174 | struct ubi_volume_desc *desc = file->private_data; | |
175 | struct ubi_device *ubi = desc->vol->ubi; | |
496ad9aa | 176 | struct inode *inode = file_inode(file); |
02c24a82 JB |
177 | int err; |
178 | mutex_lock(&inode->i_mutex); | |
179 | err = ubi_sync(ubi->ubi_num); | |
180 | mutex_unlock(&inode->i_mutex); | |
181 | return err; | |
1b24bc3a CC |
182 | } |
183 | ||
184 | ||
801c135c AB |
185 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, |
186 | loff_t *offp) | |
187 | { | |
188 | struct ubi_volume_desc *desc = file->private_data; | |
189 | struct ubi_volume *vol = desc->vol; | |
190 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 191 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
192 | size_t count_save = count; |
193 | void *tbuf; | |
801c135c | 194 | |
c8566350 | 195 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 196 | count, *offp, vol->vol_id); |
801c135c AB |
197 | |
198 | if (vol->updating) { | |
32608703 | 199 | ubi_err(vol->ubi, "updating"); |
801c135c AB |
200 | return -EBUSY; |
201 | } | |
202 | if (vol->upd_marker) { | |
32608703 | 203 | ubi_err(vol->ubi, "damaged volume, update marker is set"); |
801c135c AB |
204 | return -EBADF; |
205 | } | |
206 | if (*offp == vol->used_bytes || count == 0) | |
207 | return 0; | |
208 | ||
209 | if (vol->corrupted) | |
c8566350 | 210 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
211 | |
212 | if (*offp + count > vol->used_bytes) | |
213 | count_save = count = vol->used_bytes - *offp; | |
214 | ||
215 | tbuf_size = vol->usable_leb_size; | |
216 | if (count < tbuf_size) | |
217 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 218 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
219 | if (!tbuf) |
220 | return -ENOMEM; | |
221 | ||
222 | len = count > tbuf_size ? tbuf_size : count; | |
3013ee31 | 223 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
801c135c AB |
224 | |
225 | do { | |
226 | cond_resched(); | |
227 | ||
228 | if (off + len >= vol->usable_leb_size) | |
229 | len = vol->usable_leb_size - off; | |
230 | ||
89b96b69 | 231 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
232 | if (err) |
233 | break; | |
234 | ||
235 | off += len; | |
236 | if (off == vol->usable_leb_size) { | |
237 | lnum += 1; | |
238 | off -= vol->usable_leb_size; | |
239 | } | |
240 | ||
241 | count -= len; | |
242 | *offp += len; | |
243 | ||
244 | err = copy_to_user(buf, tbuf, len); | |
245 | if (err) { | |
246 | err = -EFAULT; | |
247 | break; | |
248 | } | |
249 | ||
250 | buf += len; | |
251 | len = count > tbuf_size ? tbuf_size : count; | |
252 | } while (count); | |
253 | ||
92ad8f37 | 254 | vfree(tbuf); |
801c135c AB |
255 | return err ? err : count_save - count; |
256 | } | |
257 | ||
801c135c AB |
258 | /* |
259 | * This function allows to directly write to dynamic UBI volumes, without | |
766fb95b | 260 | * issuing the volume update operation. |
801c135c AB |
261 | */ |
262 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
263 | size_t count, loff_t *offp) | |
264 | { | |
265 | struct ubi_volume_desc *desc = file->private_data; | |
266 | struct ubi_volume *vol = desc->vol; | |
267 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 268 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
269 | size_t count_save = count; |
270 | char *tbuf; | |
801c135c | 271 | |
766fb95b SA |
272 | if (!vol->direct_writes) |
273 | return -EPERM; | |
274 | ||
c8566350 | 275 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 276 | count, *offp, vol->vol_id); |
801c135c AB |
277 | |
278 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
279 | return -EROFS; | |
280 | ||
3013ee31 | 281 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
cadb40cc | 282 | if (off & (ubi->min_io_size - 1)) { |
32608703 | 283 | ubi_err(ubi, "unaligned position"); |
801c135c AB |
284 | return -EINVAL; |
285 | } | |
286 | ||
287 | if (*offp + count > vol->used_bytes) | |
288 | count_save = count = vol->used_bytes - *offp; | |
289 | ||
290 | /* We can write only in fractions of the minimum I/O unit */ | |
cadb40cc | 291 | if (count & (ubi->min_io_size - 1)) { |
32608703 | 292 | ubi_err(ubi, "unaligned write length"); |
801c135c AB |
293 | return -EINVAL; |
294 | } | |
295 | ||
296 | tbuf_size = vol->usable_leb_size; | |
297 | if (count < tbuf_size) | |
298 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 299 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
300 | if (!tbuf) |
301 | return -ENOMEM; | |
302 | ||
303 | len = count > tbuf_size ? tbuf_size : count; | |
304 | ||
305 | while (count) { | |
306 | cond_resched(); | |
307 | ||
308 | if (off + len >= vol->usable_leb_size) | |
309 | len = vol->usable_leb_size - off; | |
310 | ||
311 | err = copy_from_user(tbuf, buf, len); | |
312 | if (err) { | |
313 | err = -EFAULT; | |
314 | break; | |
315 | } | |
316 | ||
b36a261e | 317 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len); |
801c135c AB |
318 | if (err) |
319 | break; | |
320 | ||
321 | off += len; | |
322 | if (off == vol->usable_leb_size) { | |
323 | lnum += 1; | |
324 | off -= vol->usable_leb_size; | |
325 | } | |
326 | ||
327 | count -= len; | |
328 | *offp += len; | |
329 | buf += len; | |
330 | len = count > tbuf_size ? tbuf_size : count; | |
331 | } | |
332 | ||
92ad8f37 | 333 | vfree(tbuf); |
801c135c AB |
334 | return err ? err : count_save - count; |
335 | } | |
336 | ||
801c135c AB |
337 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, |
338 | size_t count, loff_t *offp) | |
339 | { | |
340 | int err = 0; | |
341 | struct ubi_volume_desc *desc = file->private_data; | |
342 | struct ubi_volume *vol = desc->vol; | |
343 | struct ubi_device *ubi = vol->ubi; | |
344 | ||
e653879c | 345 | if (!vol->updating && !vol->changing_leb) |
801c135c AB |
346 | return vol_cdev_direct_write(file, buf, count, offp); |
347 | ||
e653879c AB |
348 | if (vol->updating) |
349 | err = ubi_more_update_data(ubi, vol, buf, count); | |
350 | else | |
351 | err = ubi_more_leb_change_data(ubi, vol, buf, count); | |
352 | ||
801c135c | 353 | if (err < 0) { |
32608703 | 354 | ubi_err(ubi, "cannot accept more %zd bytes of data, error %d", |
01f7b309 | 355 | count, err); |
801c135c AB |
356 | return err; |
357 | } | |
358 | ||
359 | if (err) { | |
360 | /* | |
e653879c AB |
361 | * The operation is finished, @err contains number of actually |
362 | * written bytes. | |
801c135c AB |
363 | */ |
364 | count = err; | |
365 | ||
e653879c AB |
366 | if (vol->changing_leb) { |
367 | revoke_exclusive(desc, UBI_READWRITE); | |
368 | return count; | |
369 | } | |
370 | ||
801c135c AB |
371 | err = ubi_check_volume(ubi, vol->vol_id); |
372 | if (err < 0) | |
373 | return err; | |
374 | ||
375 | if (err) { | |
32608703 | 376 | ubi_warn(ubi, "volume %d on UBI device %d is corrupted", |
801c135c AB |
377 | vol->vol_id, ubi->ubi_num); |
378 | vol->corrupted = 1; | |
379 | } | |
380 | vol->checked = 1; | |
0e0ee1cc | 381 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
801c135c AB |
382 | revoke_exclusive(desc, UBI_READWRITE); |
383 | } | |
384 | ||
801c135c AB |
385 | return count; |
386 | } | |
387 | ||
f429b2ea AB |
388 | static long vol_cdev_ioctl(struct file *file, unsigned int cmd, |
389 | unsigned long arg) | |
801c135c AB |
390 | { |
391 | int err = 0; | |
392 | struct ubi_volume_desc *desc = file->private_data; | |
393 | struct ubi_volume *vol = desc->vol; | |
394 | struct ubi_device *ubi = vol->ubi; | |
395 | void __user *argp = (void __user *)arg; | |
396 | ||
801c135c | 397 | switch (cmd) { |
801c135c AB |
398 | /* Volume update command */ |
399 | case UBI_IOCVOLUP: | |
400 | { | |
401 | int64_t bytes, rsvd_bytes; | |
402 | ||
403 | if (!capable(CAP_SYS_RESOURCE)) { | |
404 | err = -EPERM; | |
405 | break; | |
406 | } | |
407 | ||
408 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
409 | if (err) { | |
410 | err = -EFAULT; | |
411 | break; | |
412 | } | |
413 | ||
414 | if (desc->mode == UBI_READONLY) { | |
415 | err = -EROFS; | |
416 | break; | |
417 | } | |
418 | ||
73789a3d BL |
419 | rsvd_bytes = (long long)vol->reserved_pebs * |
420 | ubi->leb_size-vol->data_pad; | |
801c135c AB |
421 | if (bytes < 0 || bytes > rsvd_bytes) { |
422 | err = -EINVAL; | |
423 | break; | |
424 | } | |
425 | ||
32608703 | 426 | err = get_exclusive(ubi, desc); |
801c135c AB |
427 | if (err < 0) |
428 | break; | |
429 | ||
1b68d0ee | 430 | err = ubi_start_update(ubi, vol, bytes); |
fda322a1 EG |
431 | if (bytes == 0) { |
432 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); | |
801c135c | 433 | revoke_exclusive(desc, UBI_READWRITE); |
fda322a1 | 434 | } |
801c135c AB |
435 | break; |
436 | } | |
437 | ||
e653879c AB |
438 | /* Atomic logical eraseblock change command */ |
439 | case UBI_IOCEBCH: | |
440 | { | |
441 | struct ubi_leb_change_req req; | |
442 | ||
443 | err = copy_from_user(&req, argp, | |
444 | sizeof(struct ubi_leb_change_req)); | |
445 | if (err) { | |
446 | err = -EFAULT; | |
447 | break; | |
448 | } | |
449 | ||
450 | if (desc->mode == UBI_READONLY || | |
451 | vol->vol_type == UBI_STATIC_VOLUME) { | |
452 | err = -EROFS; | |
453 | break; | |
454 | } | |
455 | ||
456 | /* Validate the request */ | |
457 | err = -EINVAL; | |
458 | if (req.lnum < 0 || req.lnum >= vol->reserved_pebs || | |
459 | req.bytes < 0 || req.lnum >= vol->usable_leb_size) | |
460 | break; | |
e653879c | 461 | |
32608703 | 462 | err = get_exclusive(ubi, desc); |
e653879c AB |
463 | if (err < 0) |
464 | break; | |
465 | ||
466 | err = ubi_start_leb_change(ubi, vol, &req); | |
467 | if (req.bytes == 0) | |
468 | revoke_exclusive(desc, UBI_READWRITE); | |
469 | break; | |
470 | } | |
471 | ||
801c135c AB |
472 | /* Logical eraseblock erasure command */ |
473 | case UBI_IOCEBER: | |
474 | { | |
475 | int32_t lnum; | |
476 | ||
bf07803a | 477 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
478 | if (err) { |
479 | err = -EFAULT; | |
480 | break; | |
481 | } | |
482 | ||
e653879c AB |
483 | if (desc->mode == UBI_READONLY || |
484 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
485 | err = -EROFS; |
486 | break; | |
487 | } | |
488 | ||
489 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
490 | err = -EINVAL; | |
491 | break; | |
492 | } | |
493 | ||
c8566350 | 494 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 495 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
496 | if (err) |
497 | break; | |
498 | ||
62f38455 | 499 | err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); |
801c135c AB |
500 | break; |
501 | } | |
141e6ebd CC |
502 | |
503 | /* Logical eraseblock map command */ | |
504 | case UBI_IOCEBMAP: | |
505 | { | |
506 | struct ubi_map_req req; | |
507 | ||
508 | err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); | |
509 | if (err) { | |
510 | err = -EFAULT; | |
511 | break; | |
512 | } | |
b36a261e | 513 | err = ubi_leb_map(desc, req.lnum); |
141e6ebd CC |
514 | break; |
515 | } | |
c3da23be CC |
516 | |
517 | /* Logical eraseblock un-map command */ | |
518 | case UBI_IOCEBUNMAP: | |
519 | { | |
520 | int32_t lnum; | |
521 | ||
522 | err = get_user(lnum, (__user int32_t *)argp); | |
523 | if (err) { | |
524 | err = -EFAULT; | |
525 | break; | |
526 | } | |
527 | err = ubi_leb_unmap(desc, lnum); | |
528 | break; | |
529 | } | |
a27ce8f5 CC |
530 | |
531 | /* Check if logical eraseblock is mapped command */ | |
532 | case UBI_IOCEBISMAP: | |
533 | { | |
534 | int32_t lnum; | |
535 | ||
536 | err = get_user(lnum, (__user int32_t *)argp); | |
537 | if (err) { | |
538 | err = -EFAULT; | |
539 | break; | |
540 | } | |
541 | err = ubi_is_mapped(desc, lnum); | |
542 | break; | |
543 | } | |
801c135c | 544 | |
f089c0b2 | 545 | /* Set volume property command */ |
6748482f | 546 | case UBI_IOCSETVOLPROP: |
766fb95b | 547 | { |
6748482f | 548 | struct ubi_set_vol_prop_req req; |
766fb95b SA |
549 | |
550 | err = copy_from_user(&req, argp, | |
6748482f | 551 | sizeof(struct ubi_set_vol_prop_req)); |
766fb95b SA |
552 | if (err) { |
553 | err = -EFAULT; | |
554 | break; | |
555 | } | |
556 | switch (req.property) { | |
6748482f | 557 | case UBI_VOL_PROP_DIRECT_WRITE: |
f089c0b2 | 558 | mutex_lock(&ubi->device_mutex); |
766fb95b | 559 | desc->vol->direct_writes = !!req.value; |
f089c0b2 | 560 | mutex_unlock(&ubi->device_mutex); |
766fb95b SA |
561 | break; |
562 | default: | |
563 | err = -EINVAL; | |
564 | break; | |
565 | } | |
566 | break; | |
567 | } | |
568 | ||
8af87188 AB |
569 | /* Create a R/O block device on top of the UBI volume */ |
570 | case UBI_IOCVOLCRBLK: | |
9d54c8a3 EG |
571 | { |
572 | struct ubi_volume_info vi; | |
573 | ||
574 | ubi_get_volume_info(desc, &vi); | |
4d283ee2 | 575 | err = ubiblock_create(&vi); |
9d54c8a3 EG |
576 | break; |
577 | } | |
578 | ||
8af87188 AB |
579 | /* Remove the R/O block device */ |
580 | case UBI_IOCVOLRMBLK: | |
9d54c8a3 EG |
581 | { |
582 | struct ubi_volume_info vi; | |
583 | ||
584 | ubi_get_volume_info(desc, &vi); | |
4d283ee2 | 585 | err = ubiblock_remove(&vi); |
9d54c8a3 EG |
586 | break; |
587 | } | |
588 | ||
801c135c AB |
589 | default: |
590 | err = -ENOTTY; | |
591 | break; | |
592 | } | |
801c135c AB |
593 | return err; |
594 | } | |
595 | ||
596 | /** | |
597 | * verify_mkvol_req - verify volume creation request. | |
598 | * @ubi: UBI device description object | |
599 | * @req: the request to check | |
600 | * | |
601 | * This function zero if the request is correct, and %-EINVAL if not. | |
602 | */ | |
603 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
604 | const struct ubi_mkvol_req *req) | |
605 | { | |
606 | int n, err = -EINVAL; | |
607 | ||
608 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
609 | req->name_len < 0) | |
610 | goto bad; | |
611 | ||
612 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
613 | req->vol_id != UBI_VOL_NUM_AUTO) | |
614 | goto bad; | |
615 | ||
616 | if (req->alignment == 0) | |
617 | goto bad; | |
618 | ||
619 | if (req->bytes == 0) | |
620 | goto bad; | |
621 | ||
622 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
623 | req->vol_type != UBI_STATIC_VOLUME) | |
624 | goto bad; | |
625 | ||
626 | if (req->alignment > ubi->leb_size) | |
627 | goto bad; | |
628 | ||
cadb40cc | 629 | n = req->alignment & (ubi->min_io_size - 1); |
801c135c AB |
630 | if (req->alignment != 1 && n) |
631 | goto bad; | |
632 | ||
4a59c797 RW |
633 | if (!req->name[0] || !req->name_len) |
634 | goto bad; | |
635 | ||
801c135c AB |
636 | if (req->name_len > UBI_VOL_NAME_MAX) { |
637 | err = -ENAMETOOLONG; | |
638 | goto bad; | |
639 | } | |
640 | ||
a6ea4407 AB |
641 | n = strnlen(req->name, req->name_len + 1); |
642 | if (n != req->name_len) | |
643 | goto bad; | |
644 | ||
801c135c AB |
645 | return 0; |
646 | ||
647 | bad: | |
32608703 | 648 | ubi_err(ubi, "bad volume creation request"); |
718c00bb | 649 | ubi_dump_mkvol_req(req); |
801c135c AB |
650 | return err; |
651 | } | |
652 | ||
653 | /** | |
654 | * verify_rsvol_req - verify volume re-size request. | |
655 | * @ubi: UBI device description object | |
656 | * @req: the request to check | |
657 | * | |
658 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
659 | */ | |
660 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
661 | const struct ubi_rsvol_req *req) | |
662 | { | |
663 | if (req->bytes <= 0) | |
664 | return -EINVAL; | |
665 | ||
666 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
667 | return -EINVAL; | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
f40ac9cd AB |
672 | /** |
673 | * rename_volumes - rename UBI volumes. | |
674 | * @ubi: UBI device description object | |
675 | * @req: volumes re-name request | |
676 | * | |
677 | * This is a helper function for the volume re-name IOCTL which validates the | |
678 | * the request, opens the volume and calls corresponding volumes management | |
679 | * function. Returns zero in case of success and a negative error code in case | |
680 | * of failure. | |
681 | */ | |
682 | static int rename_volumes(struct ubi_device *ubi, | |
683 | struct ubi_rnvol_req *req) | |
684 | { | |
685 | int i, n, err; | |
686 | struct list_head rename_list; | |
687 | struct ubi_rename_entry *re, *re1; | |
688 | ||
689 | if (req->count < 0 || req->count > UBI_MAX_RNVOL) | |
690 | return -EINVAL; | |
691 | ||
692 | if (req->count == 0) | |
693 | return 0; | |
694 | ||
695 | /* Validate volume IDs and names in the request */ | |
696 | for (i = 0; i < req->count; i++) { | |
697 | if (req->ents[i].vol_id < 0 || | |
698 | req->ents[i].vol_id >= ubi->vtbl_slots) | |
699 | return -EINVAL; | |
700 | if (req->ents[i].name_len < 0) | |
701 | return -EINVAL; | |
702 | if (req->ents[i].name_len > UBI_VOL_NAME_MAX) | |
703 | return -ENAMETOOLONG; | |
704 | req->ents[i].name[req->ents[i].name_len] = '\0'; | |
705 | n = strlen(req->ents[i].name); | |
706 | if (n != req->ents[i].name_len) | |
7fbbd057 | 707 | return -EINVAL; |
f40ac9cd AB |
708 | } |
709 | ||
710 | /* Make sure volume IDs and names are unique */ | |
711 | for (i = 0; i < req->count - 1; i++) { | |
712 | for (n = i + 1; n < req->count; n++) { | |
713 | if (req->ents[i].vol_id == req->ents[n].vol_id) { | |
32608703 | 714 | ubi_err(ubi, "duplicated volume id %d", |
f40ac9cd AB |
715 | req->ents[i].vol_id); |
716 | return -EINVAL; | |
717 | } | |
718 | if (!strcmp(req->ents[i].name, req->ents[n].name)) { | |
32608703 | 719 | ubi_err(ubi, "duplicated volume name \"%s\"", |
f40ac9cd AB |
720 | req->ents[i].name); |
721 | return -EINVAL; | |
722 | } | |
723 | } | |
724 | } | |
725 | ||
726 | /* Create the re-name list */ | |
727 | INIT_LIST_HEAD(&rename_list); | |
728 | for (i = 0; i < req->count; i++) { | |
729 | int vol_id = req->ents[i].vol_id; | |
730 | int name_len = req->ents[i].name_len; | |
731 | const char *name = req->ents[i].name; | |
732 | ||
733 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
734 | if (!re) { | |
735 | err = -ENOMEM; | |
736 | goto out_free; | |
737 | } | |
738 | ||
892abde5 | 739 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY); |
f40ac9cd AB |
740 | if (IS_ERR(re->desc)) { |
741 | err = PTR_ERR(re->desc); | |
32608703 TB |
742 | ubi_err(ubi, "cannot open volume %d, error %d", |
743 | vol_id, err); | |
f40ac9cd AB |
744 | kfree(re); |
745 | goto out_free; | |
746 | } | |
747 | ||
748 | /* Skip this re-naming if the name does not really change */ | |
749 | if (re->desc->vol->name_len == name_len && | |
750 | !memcmp(re->desc->vol->name, name, name_len)) { | |
751 | ubi_close_volume(re->desc); | |
752 | kfree(re); | |
753 | continue; | |
754 | } | |
755 | ||
756 | re->new_name_len = name_len; | |
757 | memcpy(re->new_name, name, name_len); | |
758 | list_add_tail(&re->list, &rename_list); | |
719bb840 | 759 | dbg_gen("will rename volume %d from \"%s\" to \"%s\"", |
f40ac9cd AB |
760 | vol_id, re->desc->vol->name, name); |
761 | } | |
762 | ||
763 | if (list_empty(&rename_list)) | |
764 | return 0; | |
765 | ||
766 | /* Find out the volumes which have to be removed */ | |
767 | list_for_each_entry(re, &rename_list, list) { | |
768 | struct ubi_volume_desc *desc; | |
769 | int no_remove_needed = 0; | |
770 | ||
771 | /* | |
772 | * Volume @re->vol_id is going to be re-named to | |
773 | * @re->new_name, while its current name is @name. If a volume | |
774 | * with name @re->new_name currently exists, it has to be | |
775 | * removed, unless it is also re-named in the request (@req). | |
776 | */ | |
777 | list_for_each_entry(re1, &rename_list, list) { | |
778 | if (re->new_name_len == re1->desc->vol->name_len && | |
779 | !memcmp(re->new_name, re1->desc->vol->name, | |
780 | re1->desc->vol->name_len)) { | |
781 | no_remove_needed = 1; | |
782 | break; | |
783 | } | |
784 | } | |
785 | ||
786 | if (no_remove_needed) | |
787 | continue; | |
788 | ||
789 | /* | |
790 | * It seems we need to remove volume with name @re->new_name, | |
791 | * if it exists. | |
792 | */ | |
f2863c54 AB |
793 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, |
794 | UBI_EXCLUSIVE); | |
f40ac9cd AB |
795 | if (IS_ERR(desc)) { |
796 | err = PTR_ERR(desc); | |
797 | if (err == -ENODEV) | |
798 | /* Re-naming into a non-existing volume name */ | |
799 | continue; | |
800 | ||
801 | /* The volume exists but busy, or an error occurred */ | |
32608703 | 802 | ubi_err(ubi, "cannot open volume \"%s\", error %d", |
f40ac9cd AB |
803 | re->new_name, err); |
804 | goto out_free; | |
805 | } | |
806 | ||
01ebc12f JL |
807 | re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
808 | if (!re1) { | |
f40ac9cd AB |
809 | err = -ENOMEM; |
810 | ubi_close_volume(desc); | |
811 | goto out_free; | |
812 | } | |
813 | ||
01ebc12f JL |
814 | re1->remove = 1; |
815 | re1->desc = desc; | |
816 | list_add(&re1->list, &rename_list); | |
719bb840 | 817 | dbg_gen("will remove volume %d, name \"%s\"", |
01ebc12f | 818 | re1->desc->vol->vol_id, re1->desc->vol->name); |
f40ac9cd AB |
819 | } |
820 | ||
f089c0b2 | 821 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 822 | err = ubi_rename_volumes(ubi, &rename_list); |
f089c0b2 | 823 | mutex_unlock(&ubi->device_mutex); |
f40ac9cd AB |
824 | |
825 | out_free: | |
826 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
827 | ubi_close_volume(re->desc); | |
828 | list_del(&re->list); | |
829 | kfree(re); | |
830 | } | |
831 | return err; | |
832 | } | |
833 | ||
f429b2ea AB |
834 | static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, |
835 | unsigned long arg) | |
801c135c AB |
836 | { |
837 | int err = 0; | |
838 | struct ubi_device *ubi; | |
839 | struct ubi_volume_desc *desc; | |
840 | void __user *argp = (void __user *)arg; | |
841 | ||
801c135c AB |
842 | if (!capable(CAP_SYS_RESOURCE)) |
843 | return -EPERM; | |
844 | ||
f429b2ea | 845 | ubi = ubi_get_by_major(imajor(file->f_mapping->host)); |
e73f4459 AB |
846 | if (!ubi) |
847 | return -ENODEV; | |
801c135c AB |
848 | |
849 | switch (cmd) { | |
850 | /* Create volume command */ | |
851 | case UBI_IOCMKVOL: | |
852 | { | |
853 | struct ubi_mkvol_req req; | |
854 | ||
c8566350 | 855 | dbg_gen("create volume"); |
897a316c | 856 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
857 | if (err) { |
858 | err = -EFAULT; | |
859 | break; | |
860 | } | |
861 | ||
862 | err = verify_mkvol_req(ubi, &req); | |
863 | if (err) | |
864 | break; | |
865 | ||
f089c0b2 | 866 | mutex_lock(&ubi->device_mutex); |
801c135c | 867 | err = ubi_create_volume(ubi, &req); |
f089c0b2 | 868 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
869 | if (err) |
870 | break; | |
871 | ||
bf07803a | 872 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
873 | if (err) |
874 | err = -EFAULT; | |
875 | ||
876 | break; | |
877 | } | |
878 | ||
879 | /* Remove volume command */ | |
880 | case UBI_IOCRMVOL: | |
881 | { | |
882 | int vol_id; | |
883 | ||
c8566350 | 884 | dbg_gen("remove volume"); |
bf07803a | 885 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
886 | if (err) { |
887 | err = -EFAULT; | |
888 | break; | |
889 | } | |
890 | ||
891 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
892 | if (IS_ERR(desc)) { | |
893 | err = PTR_ERR(desc); | |
894 | break; | |
895 | } | |
896 | ||
f089c0b2 | 897 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 898 | err = ubi_remove_volume(desc, 0); |
f089c0b2 | 899 | mutex_unlock(&ubi->device_mutex); |
40e4d0c1 | 900 | |
450f872a | 901 | /* |
40e4d0c1 AB |
902 | * The volume is deleted (unless an error occurred), and the |
903 | * 'struct ubi_volume' object will be freed when | |
904 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
905 | */ |
906 | ubi_close_volume(desc); | |
801c135c AB |
907 | break; |
908 | } | |
909 | ||
910 | /* Re-size volume command */ | |
911 | case UBI_IOCRSVOL: | |
912 | { | |
913 | int pebs; | |
801c135c AB |
914 | struct ubi_rsvol_req req; |
915 | ||
c8566350 | 916 | dbg_gen("re-size volume"); |
897a316c | 917 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
918 | if (err) { |
919 | err = -EFAULT; | |
920 | break; | |
921 | } | |
922 | ||
923 | err = verify_rsvol_req(ubi, &req); | |
924 | if (err) | |
925 | break; | |
926 | ||
927 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
928 | if (IS_ERR(desc)) { | |
929 | err = PTR_ERR(desc); | |
930 | break; | |
931 | } | |
932 | ||
3013ee31 AB |
933 | pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, |
934 | desc->vol->usable_leb_size); | |
801c135c | 935 | |
f089c0b2 | 936 | mutex_lock(&ubi->device_mutex); |
801c135c | 937 | err = ubi_resize_volume(desc, pebs); |
f089c0b2 | 938 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
939 | ubi_close_volume(desc); |
940 | break; | |
941 | } | |
942 | ||
f40ac9cd AB |
943 | /* Re-name volumes command */ |
944 | case UBI_IOCRNVOL: | |
945 | { | |
946 | struct ubi_rnvol_req *req; | |
947 | ||
719bb840 | 948 | dbg_gen("re-name volumes"); |
f40ac9cd AB |
949 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); |
950 | if (!req) { | |
951 | err = -ENOMEM; | |
952 | break; | |
953 | }; | |
954 | ||
955 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
956 | if (err) { | |
957 | err = -EFAULT; | |
958 | kfree(req); | |
959 | break; | |
960 | } | |
961 | ||
f40ac9cd | 962 | err = rename_volumes(ubi, req); |
f40ac9cd AB |
963 | kfree(req); |
964 | break; | |
965 | } | |
966 | ||
801c135c AB |
967 | default: |
968 | err = -ENOTTY; | |
969 | break; | |
970 | } | |
971 | ||
e73f4459 | 972 | ubi_put_device(ubi); |
801c135c AB |
973 | return err; |
974 | } | |
975 | ||
f429b2ea AB |
976 | static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, |
977 | unsigned long arg) | |
897a316c AB |
978 | { |
979 | int err = 0; | |
980 | void __user *argp = (void __user *)arg; | |
981 | ||
982 | if (!capable(CAP_SYS_RESOURCE)) | |
983 | return -EPERM; | |
984 | ||
985 | switch (cmd) { | |
986 | /* Attach an MTD device command */ | |
987 | case UBI_IOCATT: | |
988 | { | |
989 | struct ubi_attach_req req; | |
990 | struct mtd_info *mtd; | |
991 | ||
c8566350 | 992 | dbg_gen("attach MTD device"); |
897a316c AB |
993 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
994 | if (err) { | |
995 | err = -EFAULT; | |
996 | break; | |
997 | } | |
998 | ||
999 | if (req.mtd_num < 0 || | |
1000 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
1001 | err = -EINVAL; | |
1002 | break; | |
1003 | } | |
1004 | ||
1005 | mtd = get_mtd_device(NULL, req.mtd_num); | |
1006 | if (IS_ERR(mtd)) { | |
1007 | err = PTR_ERR(mtd); | |
1008 | break; | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * Note, further request verification is done by | |
1013 | * 'ubi_attach_mtd_dev()'. | |
1014 | */ | |
1015 | mutex_lock(&ubi_devices_mutex); | |
256334c3 | 1016 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, |
db7e21c2 | 1017 | req.max_beb_per1024); |
897a316c AB |
1018 | mutex_unlock(&ubi_devices_mutex); |
1019 | if (err < 0) | |
1020 | put_mtd_device(mtd); | |
1021 | else | |
1022 | /* @err contains UBI device number */ | |
1023 | err = put_user(err, (__user int32_t *)argp); | |
1024 | ||
1025 | break; | |
1026 | } | |
1027 | ||
1028 | /* Detach an MTD device command */ | |
1029 | case UBI_IOCDET: | |
1030 | { | |
1031 | int ubi_num; | |
1032 | ||
2ce7be1b | 1033 | dbg_gen("detach MTD device"); |
897a316c AB |
1034 | err = get_user(ubi_num, (__user int32_t *)argp); |
1035 | if (err) { | |
1036 | err = -EFAULT; | |
1037 | break; | |
1038 | } | |
1039 | ||
1040 | mutex_lock(&ubi_devices_mutex); | |
1041 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
1042 | mutex_unlock(&ubi_devices_mutex); | |
1043 | break; | |
1044 | } | |
1045 | ||
1046 | default: | |
1047 | err = -ENOTTY; | |
1048 | break; | |
1049 | } | |
1050 | ||
1051 | return err; | |
1052 | } | |
1053 | ||
f429b2ea AB |
1054 | #ifdef CONFIG_COMPAT |
1055 | static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1056 | unsigned long arg) | |
1057 | { | |
1058 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1059 | ||
1060 | return vol_cdev_ioctl(file, cmd, translated_arg); | |
1061 | } | |
1062 | ||
1063 | static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1064 | unsigned long arg) | |
1065 | { | |
1066 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1067 | ||
1068 | return ubi_cdev_ioctl(file, cmd, translated_arg); | |
1069 | } | |
1070 | ||
1071 | static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1072 | unsigned long arg) | |
1073 | { | |
1074 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1075 | ||
1076 | return ctrl_cdev_ioctl(file, cmd, translated_arg); | |
1077 | } | |
1078 | #else | |
1079 | #define vol_cdev_compat_ioctl NULL | |
1080 | #define ubi_cdev_compat_ioctl NULL | |
1081 | #define ctrl_cdev_compat_ioctl NULL | |
1082 | #endif | |
1083 | ||
1084 | /* UBI volume character device operations */ | |
1085 | const struct file_operations ubi_vol_cdev_operations = { | |
1086 | .owner = THIS_MODULE, | |
1087 | .open = vol_cdev_open, | |
1088 | .release = vol_cdev_release, | |
1089 | .llseek = vol_cdev_llseek, | |
1090 | .read = vol_cdev_read, | |
1091 | .write = vol_cdev_write, | |
1b24bc3a | 1092 | .fsync = vol_cdev_fsync, |
f429b2ea AB |
1093 | .unlocked_ioctl = vol_cdev_ioctl, |
1094 | .compat_ioctl = vol_cdev_compat_ioctl, | |
9f961b57 AB |
1095 | }; |
1096 | ||
801c135c | 1097 | /* UBI character device operations */ |
4d187a88 | 1098 | const struct file_operations ubi_cdev_operations = { |
f429b2ea AB |
1099 | .owner = THIS_MODULE, |
1100 | .llseek = no_llseek, | |
1101 | .unlocked_ioctl = ubi_cdev_ioctl, | |
1102 | .compat_ioctl = ubi_cdev_compat_ioctl, | |
801c135c AB |
1103 | }; |
1104 | ||
f429b2ea AB |
1105 | /* UBI control character device operations */ |
1106 | const struct file_operations ubi_ctrl_cdev_operations = { | |
1107 | .owner = THIS_MODULE, | |
1108 | .unlocked_ioctl = ctrl_cdev_ioctl, | |
1109 | .compat_ioctl = ctrl_cdev_compat_ioctl, | |
e10b376e | 1110 | .llseek = no_llseek, |
801c135c | 1111 | }; |