Commit | Line | Data |
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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. | |
51 | * @desc: volume descriptor | |
52 | * | |
53 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
54 | * mode value (positive integer) in case of success and a negative error code | |
55 | * in case of failure. | |
56 | */ | |
57 | static int get_exclusive(struct ubi_volume_desc *desc) | |
58 | { | |
59 | int users, err; | |
60 | struct ubi_volume *vol = desc->vol; | |
61 | ||
62 | spin_lock(&vol->ubi->volumes_lock); | |
63 | users = vol->readers + vol->writers + vol->exclusive; | |
64 | ubi_assert(users > 0); | |
65 | if (users > 1) { | |
e2986827 | 66 | ubi_err("%d users for volume %d", users, vol->vol_id); |
801c135c AB |
67 | err = -EBUSY; |
68 | } else { | |
69 | vol->readers = vol->writers = 0; | |
70 | vol->exclusive = 1; | |
71 | err = desc->mode; | |
72 | desc->mode = UBI_EXCLUSIVE; | |
73 | } | |
74 | spin_unlock(&vol->ubi->volumes_lock); | |
75 | ||
76 | return err; | |
77 | } | |
78 | ||
79 | /** | |
80 | * revoke_exclusive - revoke exclusive mode. | |
81 | * @desc: volume descriptor | |
82 | * @mode: new mode to switch to | |
83 | */ | |
84 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
85 | { | |
86 | struct ubi_volume *vol = desc->vol; | |
87 | ||
88 | spin_lock(&vol->ubi->volumes_lock); | |
89 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
90 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
91 | vol->exclusive = 0; | |
92 | if (mode == UBI_READONLY) | |
93 | vol->readers = 1; | |
94 | else if (mode == UBI_READWRITE) | |
95 | vol->writers = 1; | |
96 | else | |
97 | vol->exclusive = 1; | |
98 | spin_unlock(&vol->ubi->volumes_lock); | |
99 | ||
100 | desc->mode = mode; | |
101 | } | |
102 | ||
103 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
104 | { | |
105 | struct ubi_volume_desc *desc; | |
e73f4459 AB |
106 | int vol_id = iminor(inode) - 1, mode, ubi_num; |
107 | ||
108 | ubi_num = ubi_major2num(imajor(inode)); | |
7d200e88 | 109 | if (ubi_num < 0) |
e73f4459 | 110 | return ubi_num; |
801c135c AB |
111 | |
112 | if (file->f_mode & FMODE_WRITE) | |
113 | mode = UBI_READWRITE; | |
114 | else | |
115 | mode = UBI_READONLY; | |
116 | ||
e1cf7e6d | 117 | dbg_gen("open device %d, volume %d, mode %d", |
feddbb34 | 118 | ubi_num, vol_id, mode); |
801c135c | 119 | |
e73f4459 | 120 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
801c135c AB |
121 | if (IS_ERR(desc)) |
122 | return PTR_ERR(desc); | |
123 | ||
124 | file->private_data = desc; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
129 | { | |
130 | struct ubi_volume_desc *desc = file->private_data; | |
131 | struct ubi_volume *vol = desc->vol; | |
132 | ||
e1cf7e6d AB |
133 | dbg_gen("release device %d, volume %d, mode %d", |
134 | vol->ubi->ubi_num, vol->vol_id, desc->mode); | |
801c135c AB |
135 | |
136 | if (vol->updating) { | |
137 | ubi_warn("update of volume %d not finished, volume is damaged", | |
138 | vol->vol_id); | |
e653879c | 139 | ubi_assert(!vol->changing_leb); |
801c135c | 140 | vol->updating = 0; |
92ad8f37 | 141 | vfree(vol->upd_buf); |
e653879c | 142 | } else if (vol->changing_leb) { |
049333ce AB |
143 | dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", |
144 | vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, | |
145 | vol->vol_id); | |
e653879c AB |
146 | vol->changing_leb = 0; |
147 | vfree(vol->upd_buf); | |
801c135c AB |
148 | } |
149 | ||
150 | ubi_close_volume(desc); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
155 | { | |
156 | struct ubi_volume_desc *desc = file->private_data; | |
157 | struct ubi_volume *vol = desc->vol; | |
801c135c AB |
158 | |
159 | if (vol->updating) { | |
feddbb34 | 160 | /* Update is in progress, seeking is prohibited */ |
e2986827 | 161 | ubi_err("updating"); |
801c135c AB |
162 | return -EBUSY; |
163 | } | |
164 | ||
4a1f2f38 | 165 | return fixed_size_llseek(file, offset, origin, vol->used_bytes); |
801c135c AB |
166 | } |
167 | ||
049333ce AB |
168 | static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, |
169 | int datasync) | |
1b24bc3a CC |
170 | { |
171 | struct ubi_volume_desc *desc = file->private_data; | |
172 | struct ubi_device *ubi = desc->vol->ubi; | |
496ad9aa | 173 | struct inode *inode = file_inode(file); |
02c24a82 JB |
174 | int err; |
175 | mutex_lock(&inode->i_mutex); | |
176 | err = ubi_sync(ubi->ubi_num); | |
177 | mutex_unlock(&inode->i_mutex); | |
178 | return err; | |
1b24bc3a CC |
179 | } |
180 | ||
181 | ||
801c135c AB |
182 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, |
183 | loff_t *offp) | |
184 | { | |
185 | struct ubi_volume_desc *desc = file->private_data; | |
186 | struct ubi_volume *vol = desc->vol; | |
187 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 188 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
189 | size_t count_save = count; |
190 | void *tbuf; | |
801c135c | 191 | |
c8566350 | 192 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 193 | count, *offp, vol->vol_id); |
801c135c AB |
194 | |
195 | if (vol->updating) { | |
e2986827 | 196 | ubi_err("updating"); |
801c135c AB |
197 | return -EBUSY; |
198 | } | |
199 | if (vol->upd_marker) { | |
e2986827 | 200 | ubi_err("damaged volume, update marker is set"); |
801c135c AB |
201 | return -EBADF; |
202 | } | |
203 | if (*offp == vol->used_bytes || count == 0) | |
204 | return 0; | |
205 | ||
206 | if (vol->corrupted) | |
c8566350 | 207 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
208 | |
209 | if (*offp + count > vol->used_bytes) | |
210 | count_save = count = vol->used_bytes - *offp; | |
211 | ||
212 | tbuf_size = vol->usable_leb_size; | |
213 | if (count < tbuf_size) | |
214 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 215 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
216 | if (!tbuf) |
217 | return -ENOMEM; | |
218 | ||
219 | len = count > tbuf_size ? tbuf_size : count; | |
3013ee31 | 220 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
801c135c AB |
221 | |
222 | do { | |
223 | cond_resched(); | |
224 | ||
225 | if (off + len >= vol->usable_leb_size) | |
226 | len = vol->usable_leb_size - off; | |
227 | ||
89b96b69 | 228 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
229 | if (err) |
230 | break; | |
231 | ||
232 | off += len; | |
233 | if (off == vol->usable_leb_size) { | |
234 | lnum += 1; | |
235 | off -= vol->usable_leb_size; | |
236 | } | |
237 | ||
238 | count -= len; | |
239 | *offp += len; | |
240 | ||
241 | err = copy_to_user(buf, tbuf, len); | |
242 | if (err) { | |
243 | err = -EFAULT; | |
244 | break; | |
245 | } | |
246 | ||
247 | buf += len; | |
248 | len = count > tbuf_size ? tbuf_size : count; | |
249 | } while (count); | |
250 | ||
92ad8f37 | 251 | vfree(tbuf); |
801c135c AB |
252 | return err ? err : count_save - count; |
253 | } | |
254 | ||
801c135c AB |
255 | /* |
256 | * This function allows to directly write to dynamic UBI volumes, without | |
766fb95b | 257 | * issuing the volume update operation. |
801c135c AB |
258 | */ |
259 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
260 | size_t count, loff_t *offp) | |
261 | { | |
262 | struct ubi_volume_desc *desc = file->private_data; | |
263 | struct ubi_volume *vol = desc->vol; | |
264 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 265 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
266 | size_t count_save = count; |
267 | char *tbuf; | |
801c135c | 268 | |
766fb95b SA |
269 | if (!vol->direct_writes) |
270 | return -EPERM; | |
271 | ||
c8566350 | 272 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 273 | count, *offp, vol->vol_id); |
801c135c AB |
274 | |
275 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
276 | return -EROFS; | |
277 | ||
3013ee31 | 278 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
cadb40cc | 279 | if (off & (ubi->min_io_size - 1)) { |
e2986827 | 280 | ubi_err("unaligned position"); |
801c135c AB |
281 | return -EINVAL; |
282 | } | |
283 | ||
284 | if (*offp + count > vol->used_bytes) | |
285 | count_save = count = vol->used_bytes - *offp; | |
286 | ||
287 | /* We can write only in fractions of the minimum I/O unit */ | |
cadb40cc | 288 | if (count & (ubi->min_io_size - 1)) { |
e2986827 | 289 | ubi_err("unaligned write length"); |
801c135c AB |
290 | return -EINVAL; |
291 | } | |
292 | ||
293 | tbuf_size = vol->usable_leb_size; | |
294 | if (count < tbuf_size) | |
295 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 296 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
297 | if (!tbuf) |
298 | return -ENOMEM; | |
299 | ||
300 | len = count > tbuf_size ? tbuf_size : count; | |
301 | ||
302 | while (count) { | |
303 | cond_resched(); | |
304 | ||
305 | if (off + len >= vol->usable_leb_size) | |
306 | len = vol->usable_leb_size - off; | |
307 | ||
308 | err = copy_from_user(tbuf, buf, len); | |
309 | if (err) { | |
310 | err = -EFAULT; | |
311 | break; | |
312 | } | |
313 | ||
b36a261e | 314 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len); |
801c135c AB |
315 | if (err) |
316 | break; | |
317 | ||
318 | off += len; | |
319 | if (off == vol->usable_leb_size) { | |
320 | lnum += 1; | |
321 | off -= vol->usable_leb_size; | |
322 | } | |
323 | ||
324 | count -= len; | |
325 | *offp += len; | |
326 | buf += len; | |
327 | len = count > tbuf_size ? tbuf_size : count; | |
328 | } | |
329 | ||
92ad8f37 | 330 | vfree(tbuf); |
801c135c AB |
331 | return err ? err : count_save - count; |
332 | } | |
333 | ||
801c135c AB |
334 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, |
335 | size_t count, loff_t *offp) | |
336 | { | |
337 | int err = 0; | |
338 | struct ubi_volume_desc *desc = file->private_data; | |
339 | struct ubi_volume *vol = desc->vol; | |
340 | struct ubi_device *ubi = vol->ubi; | |
341 | ||
e653879c | 342 | if (!vol->updating && !vol->changing_leb) |
801c135c AB |
343 | return vol_cdev_direct_write(file, buf, count, offp); |
344 | ||
e653879c AB |
345 | if (vol->updating) |
346 | err = ubi_more_update_data(ubi, vol, buf, count); | |
347 | else | |
348 | err = ubi_more_leb_change_data(ubi, vol, buf, count); | |
349 | ||
801c135c | 350 | if (err < 0) { |
e653879c | 351 | ubi_err("cannot accept more %zd bytes of data, error %d", |
01f7b309 | 352 | count, err); |
801c135c AB |
353 | return err; |
354 | } | |
355 | ||
356 | if (err) { | |
357 | /* | |
e653879c AB |
358 | * The operation is finished, @err contains number of actually |
359 | * written bytes. | |
801c135c AB |
360 | */ |
361 | count = err; | |
362 | ||
e653879c AB |
363 | if (vol->changing_leb) { |
364 | revoke_exclusive(desc, UBI_READWRITE); | |
365 | return count; | |
366 | } | |
367 | ||
801c135c AB |
368 | err = ubi_check_volume(ubi, vol->vol_id); |
369 | if (err < 0) | |
370 | return err; | |
371 | ||
372 | if (err) { | |
373 | ubi_warn("volume %d on UBI device %d is corrupted", | |
374 | vol->vol_id, ubi->ubi_num); | |
375 | vol->corrupted = 1; | |
376 | } | |
377 | vol->checked = 1; | |
0e0ee1cc | 378 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
801c135c AB |
379 | revoke_exclusive(desc, UBI_READWRITE); |
380 | } | |
381 | ||
801c135c AB |
382 | return count; |
383 | } | |
384 | ||
f429b2ea AB |
385 | static long vol_cdev_ioctl(struct file *file, unsigned int cmd, |
386 | unsigned long arg) | |
801c135c AB |
387 | { |
388 | int err = 0; | |
389 | struct ubi_volume_desc *desc = file->private_data; | |
390 | struct ubi_volume *vol = desc->vol; | |
391 | struct ubi_device *ubi = vol->ubi; | |
392 | void __user *argp = (void __user *)arg; | |
393 | ||
801c135c | 394 | switch (cmd) { |
801c135c AB |
395 | /* Volume update command */ |
396 | case UBI_IOCVOLUP: | |
397 | { | |
398 | int64_t bytes, rsvd_bytes; | |
399 | ||
400 | if (!capable(CAP_SYS_RESOURCE)) { | |
401 | err = -EPERM; | |
402 | break; | |
403 | } | |
404 | ||
405 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
406 | if (err) { | |
407 | err = -EFAULT; | |
408 | break; | |
409 | } | |
410 | ||
411 | if (desc->mode == UBI_READONLY) { | |
412 | err = -EROFS; | |
413 | break; | |
414 | } | |
415 | ||
73789a3d BL |
416 | rsvd_bytes = (long long)vol->reserved_pebs * |
417 | ubi->leb_size-vol->data_pad; | |
801c135c AB |
418 | if (bytes < 0 || bytes > rsvd_bytes) { |
419 | err = -EINVAL; | |
420 | break; | |
421 | } | |
422 | ||
423 | err = get_exclusive(desc); | |
424 | if (err < 0) | |
425 | break; | |
426 | ||
1b68d0ee | 427 | err = ubi_start_update(ubi, vol, bytes); |
801c135c AB |
428 | if (bytes == 0) |
429 | revoke_exclusive(desc, UBI_READWRITE); | |
801c135c AB |
430 | break; |
431 | } | |
432 | ||
e653879c AB |
433 | /* Atomic logical eraseblock change command */ |
434 | case UBI_IOCEBCH: | |
435 | { | |
436 | struct ubi_leb_change_req req; | |
437 | ||
438 | err = copy_from_user(&req, argp, | |
439 | sizeof(struct ubi_leb_change_req)); | |
440 | if (err) { | |
441 | err = -EFAULT; | |
442 | break; | |
443 | } | |
444 | ||
445 | if (desc->mode == UBI_READONLY || | |
446 | vol->vol_type == UBI_STATIC_VOLUME) { | |
447 | err = -EROFS; | |
448 | break; | |
449 | } | |
450 | ||
451 | /* Validate the request */ | |
452 | err = -EINVAL; | |
453 | if (req.lnum < 0 || req.lnum >= vol->reserved_pebs || | |
454 | req.bytes < 0 || req.lnum >= vol->usable_leb_size) | |
455 | break; | |
e653879c AB |
456 | |
457 | err = get_exclusive(desc); | |
458 | if (err < 0) | |
459 | break; | |
460 | ||
461 | err = ubi_start_leb_change(ubi, vol, &req); | |
462 | if (req.bytes == 0) | |
463 | revoke_exclusive(desc, UBI_READWRITE); | |
464 | break; | |
465 | } | |
466 | ||
801c135c AB |
467 | /* Logical eraseblock erasure command */ |
468 | case UBI_IOCEBER: | |
469 | { | |
470 | int32_t lnum; | |
471 | ||
bf07803a | 472 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
473 | if (err) { |
474 | err = -EFAULT; | |
475 | break; | |
476 | } | |
477 | ||
e653879c AB |
478 | if (desc->mode == UBI_READONLY || |
479 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
480 | err = -EROFS; |
481 | break; | |
482 | } | |
483 | ||
484 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
485 | err = -EINVAL; | |
486 | break; | |
487 | } | |
488 | ||
c8566350 | 489 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 490 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
491 | if (err) |
492 | break; | |
493 | ||
62f38455 | 494 | err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); |
801c135c AB |
495 | break; |
496 | } | |
141e6ebd CC |
497 | |
498 | /* Logical eraseblock map command */ | |
499 | case UBI_IOCEBMAP: | |
500 | { | |
501 | struct ubi_map_req req; | |
502 | ||
503 | err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); | |
504 | if (err) { | |
505 | err = -EFAULT; | |
506 | break; | |
507 | } | |
b36a261e | 508 | err = ubi_leb_map(desc, req.lnum); |
141e6ebd CC |
509 | break; |
510 | } | |
c3da23be CC |
511 | |
512 | /* Logical eraseblock un-map command */ | |
513 | case UBI_IOCEBUNMAP: | |
514 | { | |
515 | int32_t lnum; | |
516 | ||
517 | err = get_user(lnum, (__user int32_t *)argp); | |
518 | if (err) { | |
519 | err = -EFAULT; | |
520 | break; | |
521 | } | |
522 | err = ubi_leb_unmap(desc, lnum); | |
523 | break; | |
524 | } | |
a27ce8f5 CC |
525 | |
526 | /* Check if logical eraseblock is mapped command */ | |
527 | case UBI_IOCEBISMAP: | |
528 | { | |
529 | int32_t lnum; | |
530 | ||
531 | err = get_user(lnum, (__user int32_t *)argp); | |
532 | if (err) { | |
533 | err = -EFAULT; | |
534 | break; | |
535 | } | |
536 | err = ubi_is_mapped(desc, lnum); | |
537 | break; | |
538 | } | |
801c135c | 539 | |
f089c0b2 | 540 | /* Set volume property command */ |
6748482f | 541 | case UBI_IOCSETVOLPROP: |
766fb95b | 542 | { |
6748482f | 543 | struct ubi_set_vol_prop_req req; |
766fb95b SA |
544 | |
545 | err = copy_from_user(&req, argp, | |
6748482f | 546 | sizeof(struct ubi_set_vol_prop_req)); |
766fb95b SA |
547 | if (err) { |
548 | err = -EFAULT; | |
549 | break; | |
550 | } | |
551 | switch (req.property) { | |
6748482f | 552 | case UBI_VOL_PROP_DIRECT_WRITE: |
f089c0b2 | 553 | mutex_lock(&ubi->device_mutex); |
766fb95b | 554 | desc->vol->direct_writes = !!req.value; |
f089c0b2 | 555 | mutex_unlock(&ubi->device_mutex); |
766fb95b SA |
556 | break; |
557 | default: | |
558 | err = -EINVAL; | |
559 | break; | |
560 | } | |
561 | break; | |
562 | } | |
563 | ||
801c135c AB |
564 | default: |
565 | err = -ENOTTY; | |
566 | break; | |
567 | } | |
801c135c AB |
568 | return err; |
569 | } | |
570 | ||
571 | /** | |
572 | * verify_mkvol_req - verify volume creation request. | |
573 | * @ubi: UBI device description object | |
574 | * @req: the request to check | |
575 | * | |
576 | * This function zero if the request is correct, and %-EINVAL if not. | |
577 | */ | |
578 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
579 | const struct ubi_mkvol_req *req) | |
580 | { | |
581 | int n, err = -EINVAL; | |
582 | ||
583 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
584 | req->name_len < 0) | |
585 | goto bad; | |
586 | ||
587 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
588 | req->vol_id != UBI_VOL_NUM_AUTO) | |
589 | goto bad; | |
590 | ||
591 | if (req->alignment == 0) | |
592 | goto bad; | |
593 | ||
594 | if (req->bytes == 0) | |
595 | goto bad; | |
596 | ||
597 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
598 | req->vol_type != UBI_STATIC_VOLUME) | |
599 | goto bad; | |
600 | ||
601 | if (req->alignment > ubi->leb_size) | |
602 | goto bad; | |
603 | ||
cadb40cc | 604 | n = req->alignment & (ubi->min_io_size - 1); |
801c135c AB |
605 | if (req->alignment != 1 && n) |
606 | goto bad; | |
607 | ||
4a59c797 RW |
608 | if (!req->name[0] || !req->name_len) |
609 | goto bad; | |
610 | ||
801c135c AB |
611 | if (req->name_len > UBI_VOL_NAME_MAX) { |
612 | err = -ENAMETOOLONG; | |
613 | goto bad; | |
614 | } | |
615 | ||
a6ea4407 AB |
616 | n = strnlen(req->name, req->name_len + 1); |
617 | if (n != req->name_len) | |
618 | goto bad; | |
619 | ||
801c135c AB |
620 | return 0; |
621 | ||
622 | bad: | |
e2986827 | 623 | ubi_err("bad volume creation request"); |
718c00bb | 624 | ubi_dump_mkvol_req(req); |
801c135c AB |
625 | return err; |
626 | } | |
627 | ||
628 | /** | |
629 | * verify_rsvol_req - verify volume re-size request. | |
630 | * @ubi: UBI device description object | |
631 | * @req: the request to check | |
632 | * | |
633 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
634 | */ | |
635 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
636 | const struct ubi_rsvol_req *req) | |
637 | { | |
638 | if (req->bytes <= 0) | |
639 | return -EINVAL; | |
640 | ||
641 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
642 | return -EINVAL; | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
f40ac9cd AB |
647 | /** |
648 | * rename_volumes - rename UBI volumes. | |
649 | * @ubi: UBI device description object | |
650 | * @req: volumes re-name request | |
651 | * | |
652 | * This is a helper function for the volume re-name IOCTL which validates the | |
653 | * the request, opens the volume and calls corresponding volumes management | |
654 | * function. Returns zero in case of success and a negative error code in case | |
655 | * of failure. | |
656 | */ | |
657 | static int rename_volumes(struct ubi_device *ubi, | |
658 | struct ubi_rnvol_req *req) | |
659 | { | |
660 | int i, n, err; | |
661 | struct list_head rename_list; | |
662 | struct ubi_rename_entry *re, *re1; | |
663 | ||
664 | if (req->count < 0 || req->count > UBI_MAX_RNVOL) | |
665 | return -EINVAL; | |
666 | ||
667 | if (req->count == 0) | |
668 | return 0; | |
669 | ||
670 | /* Validate volume IDs and names in the request */ | |
671 | for (i = 0; i < req->count; i++) { | |
672 | if (req->ents[i].vol_id < 0 || | |
673 | req->ents[i].vol_id >= ubi->vtbl_slots) | |
674 | return -EINVAL; | |
675 | if (req->ents[i].name_len < 0) | |
676 | return -EINVAL; | |
677 | if (req->ents[i].name_len > UBI_VOL_NAME_MAX) | |
678 | return -ENAMETOOLONG; | |
679 | req->ents[i].name[req->ents[i].name_len] = '\0'; | |
680 | n = strlen(req->ents[i].name); | |
681 | if (n != req->ents[i].name_len) | |
682 | err = -EINVAL; | |
683 | } | |
684 | ||
685 | /* Make sure volume IDs and names are unique */ | |
686 | for (i = 0; i < req->count - 1; i++) { | |
687 | for (n = i + 1; n < req->count; n++) { | |
688 | if (req->ents[i].vol_id == req->ents[n].vol_id) { | |
e2986827 | 689 | ubi_err("duplicated volume id %d", |
f40ac9cd AB |
690 | req->ents[i].vol_id); |
691 | return -EINVAL; | |
692 | } | |
693 | if (!strcmp(req->ents[i].name, req->ents[n].name)) { | |
e2986827 | 694 | ubi_err("duplicated volume name \"%s\"", |
f40ac9cd AB |
695 | req->ents[i].name); |
696 | return -EINVAL; | |
697 | } | |
698 | } | |
699 | } | |
700 | ||
701 | /* Create the re-name list */ | |
702 | INIT_LIST_HEAD(&rename_list); | |
703 | for (i = 0; i < req->count; i++) { | |
704 | int vol_id = req->ents[i].vol_id; | |
705 | int name_len = req->ents[i].name_len; | |
706 | const char *name = req->ents[i].name; | |
707 | ||
708 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
709 | if (!re) { | |
710 | err = -ENOMEM; | |
711 | goto out_free; | |
712 | } | |
713 | ||
714 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
715 | if (IS_ERR(re->desc)) { | |
716 | err = PTR_ERR(re->desc); | |
e2986827 | 717 | ubi_err("cannot open volume %d, error %d", vol_id, err); |
f40ac9cd AB |
718 | kfree(re); |
719 | goto out_free; | |
720 | } | |
721 | ||
722 | /* Skip this re-naming if the name does not really change */ | |
723 | if (re->desc->vol->name_len == name_len && | |
724 | !memcmp(re->desc->vol->name, name, name_len)) { | |
725 | ubi_close_volume(re->desc); | |
726 | kfree(re); | |
727 | continue; | |
728 | } | |
729 | ||
730 | re->new_name_len = name_len; | |
731 | memcpy(re->new_name, name, name_len); | |
732 | list_add_tail(&re->list, &rename_list); | |
719bb840 | 733 | dbg_gen("will rename volume %d from \"%s\" to \"%s\"", |
f40ac9cd AB |
734 | vol_id, re->desc->vol->name, name); |
735 | } | |
736 | ||
737 | if (list_empty(&rename_list)) | |
738 | return 0; | |
739 | ||
740 | /* Find out the volumes which have to be removed */ | |
741 | list_for_each_entry(re, &rename_list, list) { | |
742 | struct ubi_volume_desc *desc; | |
743 | int no_remove_needed = 0; | |
744 | ||
745 | /* | |
746 | * Volume @re->vol_id is going to be re-named to | |
747 | * @re->new_name, while its current name is @name. If a volume | |
748 | * with name @re->new_name currently exists, it has to be | |
749 | * removed, unless it is also re-named in the request (@req). | |
750 | */ | |
751 | list_for_each_entry(re1, &rename_list, list) { | |
752 | if (re->new_name_len == re1->desc->vol->name_len && | |
753 | !memcmp(re->new_name, re1->desc->vol->name, | |
754 | re1->desc->vol->name_len)) { | |
755 | no_remove_needed = 1; | |
756 | break; | |
757 | } | |
758 | } | |
759 | ||
760 | if (no_remove_needed) | |
761 | continue; | |
762 | ||
763 | /* | |
764 | * It seems we need to remove volume with name @re->new_name, | |
765 | * if it exists. | |
766 | */ | |
f2863c54 AB |
767 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, |
768 | UBI_EXCLUSIVE); | |
f40ac9cd AB |
769 | if (IS_ERR(desc)) { |
770 | err = PTR_ERR(desc); | |
771 | if (err == -ENODEV) | |
772 | /* Re-naming into a non-existing volume name */ | |
773 | continue; | |
774 | ||
775 | /* The volume exists but busy, or an error occurred */ | |
e2986827 | 776 | ubi_err("cannot open volume \"%s\", error %d", |
f40ac9cd AB |
777 | re->new_name, err); |
778 | goto out_free; | |
779 | } | |
780 | ||
01ebc12f JL |
781 | re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
782 | if (!re1) { | |
f40ac9cd AB |
783 | err = -ENOMEM; |
784 | ubi_close_volume(desc); | |
785 | goto out_free; | |
786 | } | |
787 | ||
01ebc12f JL |
788 | re1->remove = 1; |
789 | re1->desc = desc; | |
790 | list_add(&re1->list, &rename_list); | |
719bb840 | 791 | dbg_gen("will remove volume %d, name \"%s\"", |
01ebc12f | 792 | re1->desc->vol->vol_id, re1->desc->vol->name); |
f40ac9cd AB |
793 | } |
794 | ||
f089c0b2 | 795 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 796 | err = ubi_rename_volumes(ubi, &rename_list); |
f089c0b2 | 797 | mutex_unlock(&ubi->device_mutex); |
f40ac9cd AB |
798 | |
799 | out_free: | |
800 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
801 | ubi_close_volume(re->desc); | |
802 | list_del(&re->list); | |
803 | kfree(re); | |
804 | } | |
805 | return err; | |
806 | } | |
807 | ||
f429b2ea AB |
808 | static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, |
809 | unsigned long arg) | |
801c135c AB |
810 | { |
811 | int err = 0; | |
812 | struct ubi_device *ubi; | |
813 | struct ubi_volume_desc *desc; | |
814 | void __user *argp = (void __user *)arg; | |
815 | ||
801c135c AB |
816 | if (!capable(CAP_SYS_RESOURCE)) |
817 | return -EPERM; | |
818 | ||
f429b2ea | 819 | ubi = ubi_get_by_major(imajor(file->f_mapping->host)); |
e73f4459 AB |
820 | if (!ubi) |
821 | return -ENODEV; | |
801c135c AB |
822 | |
823 | switch (cmd) { | |
824 | /* Create volume command */ | |
825 | case UBI_IOCMKVOL: | |
826 | { | |
827 | struct ubi_mkvol_req req; | |
828 | ||
c8566350 | 829 | dbg_gen("create volume"); |
897a316c | 830 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
831 | if (err) { |
832 | err = -EFAULT; | |
833 | break; | |
834 | } | |
835 | ||
836 | err = verify_mkvol_req(ubi, &req); | |
837 | if (err) | |
838 | break; | |
839 | ||
f089c0b2 | 840 | mutex_lock(&ubi->device_mutex); |
801c135c | 841 | err = ubi_create_volume(ubi, &req); |
f089c0b2 | 842 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
843 | if (err) |
844 | break; | |
845 | ||
bf07803a | 846 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
847 | if (err) |
848 | err = -EFAULT; | |
849 | ||
850 | break; | |
851 | } | |
852 | ||
853 | /* Remove volume command */ | |
854 | case UBI_IOCRMVOL: | |
855 | { | |
856 | int vol_id; | |
857 | ||
c8566350 | 858 | dbg_gen("remove volume"); |
bf07803a | 859 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
860 | if (err) { |
861 | err = -EFAULT; | |
862 | break; | |
863 | } | |
864 | ||
865 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
866 | if (IS_ERR(desc)) { | |
867 | err = PTR_ERR(desc); | |
868 | break; | |
869 | } | |
870 | ||
f089c0b2 | 871 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 872 | err = ubi_remove_volume(desc, 0); |
f089c0b2 | 873 | mutex_unlock(&ubi->device_mutex); |
40e4d0c1 | 874 | |
450f872a | 875 | /* |
40e4d0c1 AB |
876 | * The volume is deleted (unless an error occurred), and the |
877 | * 'struct ubi_volume' object will be freed when | |
878 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
879 | */ |
880 | ubi_close_volume(desc); | |
801c135c AB |
881 | break; |
882 | } | |
883 | ||
884 | /* Re-size volume command */ | |
885 | case UBI_IOCRSVOL: | |
886 | { | |
887 | int pebs; | |
801c135c AB |
888 | struct ubi_rsvol_req req; |
889 | ||
c8566350 | 890 | dbg_gen("re-size volume"); |
897a316c | 891 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
892 | if (err) { |
893 | err = -EFAULT; | |
894 | break; | |
895 | } | |
896 | ||
897 | err = verify_rsvol_req(ubi, &req); | |
898 | if (err) | |
899 | break; | |
900 | ||
901 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
902 | if (IS_ERR(desc)) { | |
903 | err = PTR_ERR(desc); | |
904 | break; | |
905 | } | |
906 | ||
3013ee31 AB |
907 | pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, |
908 | desc->vol->usable_leb_size); | |
801c135c | 909 | |
f089c0b2 | 910 | mutex_lock(&ubi->device_mutex); |
801c135c | 911 | err = ubi_resize_volume(desc, pebs); |
f089c0b2 | 912 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
913 | ubi_close_volume(desc); |
914 | break; | |
915 | } | |
916 | ||
f40ac9cd AB |
917 | /* Re-name volumes command */ |
918 | case UBI_IOCRNVOL: | |
919 | { | |
920 | struct ubi_rnvol_req *req; | |
921 | ||
719bb840 | 922 | dbg_gen("re-name volumes"); |
f40ac9cd AB |
923 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); |
924 | if (!req) { | |
925 | err = -ENOMEM; | |
926 | break; | |
927 | }; | |
928 | ||
929 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
930 | if (err) { | |
931 | err = -EFAULT; | |
932 | kfree(req); | |
933 | break; | |
934 | } | |
935 | ||
f40ac9cd | 936 | err = rename_volumes(ubi, req); |
f40ac9cd AB |
937 | kfree(req); |
938 | break; | |
939 | } | |
940 | ||
801c135c AB |
941 | default: |
942 | err = -ENOTTY; | |
943 | break; | |
944 | } | |
945 | ||
e73f4459 | 946 | ubi_put_device(ubi); |
801c135c AB |
947 | return err; |
948 | } | |
949 | ||
f429b2ea AB |
950 | static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, |
951 | unsigned long arg) | |
897a316c AB |
952 | { |
953 | int err = 0; | |
954 | void __user *argp = (void __user *)arg; | |
955 | ||
956 | if (!capable(CAP_SYS_RESOURCE)) | |
957 | return -EPERM; | |
958 | ||
959 | switch (cmd) { | |
960 | /* Attach an MTD device command */ | |
961 | case UBI_IOCATT: | |
962 | { | |
963 | struct ubi_attach_req req; | |
964 | struct mtd_info *mtd; | |
965 | ||
c8566350 | 966 | dbg_gen("attach MTD device"); |
897a316c AB |
967 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
968 | if (err) { | |
969 | err = -EFAULT; | |
970 | break; | |
971 | } | |
972 | ||
973 | if (req.mtd_num < 0 || | |
974 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
975 | err = -EINVAL; | |
976 | break; | |
977 | } | |
978 | ||
979 | mtd = get_mtd_device(NULL, req.mtd_num); | |
980 | if (IS_ERR(mtd)) { | |
981 | err = PTR_ERR(mtd); | |
982 | break; | |
983 | } | |
984 | ||
985 | /* | |
986 | * Note, further request verification is done by | |
987 | * 'ubi_attach_mtd_dev()'. | |
988 | */ | |
989 | mutex_lock(&ubi_devices_mutex); | |
256334c3 | 990 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, |
db7e21c2 | 991 | req.max_beb_per1024); |
897a316c AB |
992 | mutex_unlock(&ubi_devices_mutex); |
993 | if (err < 0) | |
994 | put_mtd_device(mtd); | |
995 | else | |
996 | /* @err contains UBI device number */ | |
997 | err = put_user(err, (__user int32_t *)argp); | |
998 | ||
999 | break; | |
1000 | } | |
1001 | ||
1002 | /* Detach an MTD device command */ | |
1003 | case UBI_IOCDET: | |
1004 | { | |
1005 | int ubi_num; | |
1006 | ||
2ce7be1b | 1007 | dbg_gen("detach MTD device"); |
897a316c AB |
1008 | err = get_user(ubi_num, (__user int32_t *)argp); |
1009 | if (err) { | |
1010 | err = -EFAULT; | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | mutex_lock(&ubi_devices_mutex); | |
1015 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
1016 | mutex_unlock(&ubi_devices_mutex); | |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | default: | |
1021 | err = -ENOTTY; | |
1022 | break; | |
1023 | } | |
1024 | ||
1025 | return err; | |
1026 | } | |
1027 | ||
f429b2ea AB |
1028 | #ifdef CONFIG_COMPAT |
1029 | static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1030 | unsigned long arg) | |
1031 | { | |
1032 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1033 | ||
1034 | return vol_cdev_ioctl(file, cmd, translated_arg); | |
1035 | } | |
1036 | ||
1037 | static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1038 | unsigned long arg) | |
1039 | { | |
1040 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1041 | ||
1042 | return ubi_cdev_ioctl(file, cmd, translated_arg); | |
1043 | } | |
1044 | ||
1045 | static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1046 | unsigned long arg) | |
1047 | { | |
1048 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1049 | ||
1050 | return ctrl_cdev_ioctl(file, cmd, translated_arg); | |
1051 | } | |
1052 | #else | |
1053 | #define vol_cdev_compat_ioctl NULL | |
1054 | #define ubi_cdev_compat_ioctl NULL | |
1055 | #define ctrl_cdev_compat_ioctl NULL | |
1056 | #endif | |
1057 | ||
1058 | /* UBI volume character device operations */ | |
1059 | const struct file_operations ubi_vol_cdev_operations = { | |
1060 | .owner = THIS_MODULE, | |
1061 | .open = vol_cdev_open, | |
1062 | .release = vol_cdev_release, | |
1063 | .llseek = vol_cdev_llseek, | |
1064 | .read = vol_cdev_read, | |
1065 | .write = vol_cdev_write, | |
1b24bc3a | 1066 | .fsync = vol_cdev_fsync, |
f429b2ea AB |
1067 | .unlocked_ioctl = vol_cdev_ioctl, |
1068 | .compat_ioctl = vol_cdev_compat_ioctl, | |
9f961b57 AB |
1069 | }; |
1070 | ||
801c135c | 1071 | /* UBI character device operations */ |
4d187a88 | 1072 | const struct file_operations ubi_cdev_operations = { |
f429b2ea AB |
1073 | .owner = THIS_MODULE, |
1074 | .llseek = no_llseek, | |
1075 | .unlocked_ioctl = ubi_cdev_ioctl, | |
1076 | .compat_ioctl = ubi_cdev_compat_ioctl, | |
801c135c AB |
1077 | }; |
1078 | ||
f429b2ea AB |
1079 | /* UBI control character device operations */ |
1080 | const struct file_operations ubi_ctrl_cdev_operations = { | |
1081 | .owner = THIS_MODULE, | |
1082 | .unlocked_ioctl = ctrl_cdev_ioctl, | |
1083 | .compat_ioctl = ctrl_cdev_compat_ioctl, | |
e10b376e | 1084 | .llseek = no_llseek, |
801c135c | 1085 | }; |