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) { | |
66 | dbg_err("%d users for volume %d", users, vol->vol_id); | |
67 | err = -EBUSY; | |
68 | } else { | |
69 | vol->readers = vol->writers = 0; | |
70 | vol->exclusive = 1; | |
71 | err = desc->mode; | |
72 | desc->mode = UBI_EXCLUSIVE; | |
73 | } | |
74 | spin_unlock(&vol->ubi->volumes_lock); | |
75 | ||
76 | return err; | |
77 | } | |
78 | ||
79 | /** | |
80 | * revoke_exclusive - revoke exclusive mode. | |
81 | * @desc: volume descriptor | |
82 | * @mode: new mode to switch to | |
83 | */ | |
84 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
85 | { | |
86 | struct ubi_volume *vol = desc->vol; | |
87 | ||
88 | spin_lock(&vol->ubi->volumes_lock); | |
89 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
90 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
91 | vol->exclusive = 0; | |
92 | if (mode == UBI_READONLY) | |
93 | vol->readers = 1; | |
94 | else if (mode == UBI_READWRITE) | |
95 | vol->writers = 1; | |
96 | else | |
97 | vol->exclusive = 1; | |
98 | spin_unlock(&vol->ubi->volumes_lock); | |
99 | ||
100 | desc->mode = mode; | |
101 | } | |
102 | ||
103 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
104 | { | |
105 | struct ubi_volume_desc *desc; | |
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 AB |
117 | dbg_gen("open device %d, volume %d, mode %d", |
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) { |
c8566350 | 143 | dbg_gen("only %lld of %lld bytes received for atomic LEB change" |
e653879c AB |
144 | " for volume %d:%d, cancel", vol->upd_received, |
145 | vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id); | |
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; | |
158 | loff_t new_offset; | |
159 | ||
160 | if (vol->updating) { | |
161 | /* Update is in progress, seeking is prohibited */ | |
162 | dbg_err("updating"); | |
163 | return -EBUSY; | |
164 | } | |
165 | ||
166 | switch (origin) { | |
167 | case 0: /* SEEK_SET */ | |
168 | new_offset = offset; | |
169 | break; | |
170 | case 1: /* SEEK_CUR */ | |
171 | new_offset = file->f_pos + offset; | |
172 | break; | |
173 | case 2: /* SEEK_END */ | |
174 | new_offset = vol->used_bytes + offset; | |
175 | break; | |
176 | default: | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
181 | dbg_err("bad seek %lld", new_offset); | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
c8566350 | 185 | dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld", |
801c135c AB |
186 | vol->vol_id, offset, origin, new_offset); |
187 | ||
188 | file->f_pos = new_offset; | |
189 | return new_offset; | |
190 | } | |
191 | ||
7ea80859 | 192 | static int vol_cdev_fsync(struct file *file, int datasync) |
1b24bc3a CC |
193 | { |
194 | struct ubi_volume_desc *desc = file->private_data; | |
195 | struct ubi_device *ubi = desc->vol->ubi; | |
196 | ||
197 | return ubi_sync(ubi->ubi_num); | |
198 | } | |
199 | ||
200 | ||
801c135c AB |
201 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, |
202 | loff_t *offp) | |
203 | { | |
204 | struct ubi_volume_desc *desc = file->private_data; | |
205 | struct ubi_volume *vol = desc->vol; | |
206 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 207 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
208 | size_t count_save = count; |
209 | void *tbuf; | |
801c135c | 210 | |
c8566350 | 211 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 212 | count, *offp, vol->vol_id); |
801c135c AB |
213 | |
214 | if (vol->updating) { | |
215 | dbg_err("updating"); | |
216 | return -EBUSY; | |
217 | } | |
218 | if (vol->upd_marker) { | |
219 | dbg_err("damaged volume, update marker is set"); | |
220 | return -EBADF; | |
221 | } | |
222 | if (*offp == vol->used_bytes || count == 0) | |
223 | return 0; | |
224 | ||
225 | if (vol->corrupted) | |
c8566350 | 226 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
227 | |
228 | if (*offp + count > vol->used_bytes) | |
229 | count_save = count = vol->used_bytes - *offp; | |
230 | ||
231 | tbuf_size = vol->usable_leb_size; | |
232 | if (count < tbuf_size) | |
233 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 234 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
235 | if (!tbuf) |
236 | return -ENOMEM; | |
237 | ||
238 | len = count > tbuf_size ? tbuf_size : count; | |
3013ee31 | 239 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
801c135c AB |
240 | |
241 | do { | |
242 | cond_resched(); | |
243 | ||
244 | if (off + len >= vol->usable_leb_size) | |
245 | len = vol->usable_leb_size - off; | |
246 | ||
89b96b69 | 247 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
248 | if (err) |
249 | break; | |
250 | ||
251 | off += len; | |
252 | if (off == vol->usable_leb_size) { | |
253 | lnum += 1; | |
254 | off -= vol->usable_leb_size; | |
255 | } | |
256 | ||
257 | count -= len; | |
258 | *offp += len; | |
259 | ||
260 | err = copy_to_user(buf, tbuf, len); | |
261 | if (err) { | |
262 | err = -EFAULT; | |
263 | break; | |
264 | } | |
265 | ||
266 | buf += len; | |
267 | len = count > tbuf_size ? tbuf_size : count; | |
268 | } while (count); | |
269 | ||
92ad8f37 | 270 | vfree(tbuf); |
801c135c AB |
271 | return err ? err : count_save - count; |
272 | } | |
273 | ||
801c135c AB |
274 | /* |
275 | * This function allows to directly write to dynamic UBI volumes, without | |
766fb95b | 276 | * issuing the volume update operation. |
801c135c AB |
277 | */ |
278 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
279 | size_t count, loff_t *offp) | |
280 | { | |
281 | struct ubi_volume_desc *desc = file->private_data; | |
282 | struct ubi_volume *vol = desc->vol; | |
283 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 284 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
285 | size_t count_save = count; |
286 | char *tbuf; | |
801c135c | 287 | |
766fb95b SA |
288 | if (!vol->direct_writes) |
289 | return -EPERM; | |
290 | ||
c8566350 | 291 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 292 | count, *offp, vol->vol_id); |
801c135c AB |
293 | |
294 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
295 | return -EROFS; | |
296 | ||
3013ee31 | 297 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
cadb40cc | 298 | if (off & (ubi->min_io_size - 1)) { |
801c135c AB |
299 | dbg_err("unaligned position"); |
300 | return -EINVAL; | |
301 | } | |
302 | ||
303 | if (*offp + count > vol->used_bytes) | |
304 | count_save = count = vol->used_bytes - *offp; | |
305 | ||
306 | /* We can write only in fractions of the minimum I/O unit */ | |
cadb40cc | 307 | if (count & (ubi->min_io_size - 1)) { |
801c135c AB |
308 | dbg_err("unaligned write length"); |
309 | return -EINVAL; | |
310 | } | |
311 | ||
312 | tbuf_size = vol->usable_leb_size; | |
313 | if (count < tbuf_size) | |
314 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 315 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
316 | if (!tbuf) |
317 | return -ENOMEM; | |
318 | ||
319 | len = count > tbuf_size ? tbuf_size : count; | |
320 | ||
321 | while (count) { | |
322 | cond_resched(); | |
323 | ||
324 | if (off + len >= vol->usable_leb_size) | |
325 | len = vol->usable_leb_size - off; | |
326 | ||
327 | err = copy_from_user(tbuf, buf, len); | |
328 | if (err) { | |
329 | err = -EFAULT; | |
330 | break; | |
331 | } | |
332 | ||
89b96b69 | 333 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len, |
801c135c AB |
334 | UBI_UNKNOWN); |
335 | if (err) | |
336 | break; | |
337 | ||
338 | off += len; | |
339 | if (off == vol->usable_leb_size) { | |
340 | lnum += 1; | |
341 | off -= vol->usable_leb_size; | |
342 | } | |
343 | ||
344 | count -= len; | |
345 | *offp += len; | |
346 | buf += len; | |
347 | len = count > tbuf_size ? tbuf_size : count; | |
348 | } | |
349 | ||
92ad8f37 | 350 | vfree(tbuf); |
801c135c AB |
351 | return err ? err : count_save - count; |
352 | } | |
353 | ||
801c135c AB |
354 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, |
355 | size_t count, loff_t *offp) | |
356 | { | |
357 | int err = 0; | |
358 | struct ubi_volume_desc *desc = file->private_data; | |
359 | struct ubi_volume *vol = desc->vol; | |
360 | struct ubi_device *ubi = vol->ubi; | |
361 | ||
e653879c | 362 | if (!vol->updating && !vol->changing_leb) |
801c135c AB |
363 | return vol_cdev_direct_write(file, buf, count, offp); |
364 | ||
e653879c AB |
365 | if (vol->updating) |
366 | err = ubi_more_update_data(ubi, vol, buf, count); | |
367 | else | |
368 | err = ubi_more_leb_change_data(ubi, vol, buf, count); | |
369 | ||
801c135c | 370 | if (err < 0) { |
e653879c | 371 | ubi_err("cannot accept more %zd bytes of data, error %d", |
01f7b309 | 372 | count, err); |
801c135c AB |
373 | return err; |
374 | } | |
375 | ||
376 | if (err) { | |
377 | /* | |
e653879c AB |
378 | * The operation is finished, @err contains number of actually |
379 | * written bytes. | |
801c135c AB |
380 | */ |
381 | count = err; | |
382 | ||
e653879c AB |
383 | if (vol->changing_leb) { |
384 | revoke_exclusive(desc, UBI_READWRITE); | |
385 | return count; | |
386 | } | |
387 | ||
801c135c AB |
388 | err = ubi_check_volume(ubi, vol->vol_id); |
389 | if (err < 0) | |
390 | return err; | |
391 | ||
392 | if (err) { | |
393 | ubi_warn("volume %d on UBI device %d is corrupted", | |
394 | vol->vol_id, ubi->ubi_num); | |
395 | vol->corrupted = 1; | |
396 | } | |
397 | vol->checked = 1; | |
0e0ee1cc | 398 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
801c135c AB |
399 | revoke_exclusive(desc, UBI_READWRITE); |
400 | } | |
401 | ||
801c135c AB |
402 | return count; |
403 | } | |
404 | ||
f429b2ea AB |
405 | static long vol_cdev_ioctl(struct file *file, unsigned int cmd, |
406 | unsigned long arg) | |
801c135c AB |
407 | { |
408 | int err = 0; | |
409 | struct ubi_volume_desc *desc = file->private_data; | |
410 | struct ubi_volume *vol = desc->vol; | |
411 | struct ubi_device *ubi = vol->ubi; | |
412 | void __user *argp = (void __user *)arg; | |
413 | ||
801c135c | 414 | switch (cmd) { |
801c135c AB |
415 | /* Volume update command */ |
416 | case UBI_IOCVOLUP: | |
417 | { | |
418 | int64_t bytes, rsvd_bytes; | |
419 | ||
420 | if (!capable(CAP_SYS_RESOURCE)) { | |
421 | err = -EPERM; | |
422 | break; | |
423 | } | |
424 | ||
425 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
426 | if (err) { | |
427 | err = -EFAULT; | |
428 | break; | |
429 | } | |
430 | ||
431 | if (desc->mode == UBI_READONLY) { | |
432 | err = -EROFS; | |
433 | break; | |
434 | } | |
435 | ||
73789a3d BL |
436 | rsvd_bytes = (long long)vol->reserved_pebs * |
437 | ubi->leb_size-vol->data_pad; | |
801c135c AB |
438 | if (bytes < 0 || bytes > rsvd_bytes) { |
439 | err = -EINVAL; | |
440 | break; | |
441 | } | |
442 | ||
443 | err = get_exclusive(desc); | |
444 | if (err < 0) | |
445 | break; | |
446 | ||
1b68d0ee | 447 | err = ubi_start_update(ubi, vol, bytes); |
801c135c AB |
448 | if (bytes == 0) |
449 | revoke_exclusive(desc, UBI_READWRITE); | |
801c135c AB |
450 | break; |
451 | } | |
452 | ||
e653879c AB |
453 | /* Atomic logical eraseblock change command */ |
454 | case UBI_IOCEBCH: | |
455 | { | |
456 | struct ubi_leb_change_req req; | |
457 | ||
458 | err = copy_from_user(&req, argp, | |
459 | sizeof(struct ubi_leb_change_req)); | |
460 | if (err) { | |
461 | err = -EFAULT; | |
462 | break; | |
463 | } | |
464 | ||
465 | if (desc->mode == UBI_READONLY || | |
466 | vol->vol_type == UBI_STATIC_VOLUME) { | |
467 | err = -EROFS; | |
468 | break; | |
469 | } | |
470 | ||
471 | /* Validate the request */ | |
472 | err = -EINVAL; | |
473 | if (req.lnum < 0 || req.lnum >= vol->reserved_pebs || | |
474 | req.bytes < 0 || req.lnum >= vol->usable_leb_size) | |
475 | break; | |
476 | if (req.dtype != UBI_LONGTERM && req.dtype != UBI_SHORTTERM && | |
477 | req.dtype != UBI_UNKNOWN) | |
478 | break; | |
479 | ||
480 | err = get_exclusive(desc); | |
481 | if (err < 0) | |
482 | break; | |
483 | ||
484 | err = ubi_start_leb_change(ubi, vol, &req); | |
485 | if (req.bytes == 0) | |
486 | revoke_exclusive(desc, UBI_READWRITE); | |
487 | break; | |
488 | } | |
489 | ||
801c135c AB |
490 | /* Logical eraseblock erasure command */ |
491 | case UBI_IOCEBER: | |
492 | { | |
493 | int32_t lnum; | |
494 | ||
bf07803a | 495 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
496 | if (err) { |
497 | err = -EFAULT; | |
498 | break; | |
499 | } | |
500 | ||
e653879c AB |
501 | if (desc->mode == UBI_READONLY || |
502 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
503 | err = -EROFS; |
504 | break; | |
505 | } | |
506 | ||
507 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
508 | err = -EINVAL; | |
509 | break; | |
510 | } | |
511 | ||
c8566350 | 512 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 513 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
514 | if (err) |
515 | break; | |
516 | ||
517 | err = ubi_wl_flush(ubi); | |
518 | break; | |
519 | } | |
141e6ebd CC |
520 | |
521 | /* Logical eraseblock map command */ | |
522 | case UBI_IOCEBMAP: | |
523 | { | |
524 | struct ubi_map_req req; | |
525 | ||
526 | err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); | |
527 | if (err) { | |
528 | err = -EFAULT; | |
529 | break; | |
530 | } | |
531 | err = ubi_leb_map(desc, req.lnum, req.dtype); | |
532 | break; | |
533 | } | |
c3da23be CC |
534 | |
535 | /* Logical eraseblock un-map command */ | |
536 | case UBI_IOCEBUNMAP: | |
537 | { | |
538 | int32_t lnum; | |
539 | ||
540 | err = get_user(lnum, (__user int32_t *)argp); | |
541 | if (err) { | |
542 | err = -EFAULT; | |
543 | break; | |
544 | } | |
545 | err = ubi_leb_unmap(desc, lnum); | |
546 | break; | |
547 | } | |
a27ce8f5 CC |
548 | |
549 | /* Check if logical eraseblock is mapped command */ | |
550 | case UBI_IOCEBISMAP: | |
551 | { | |
552 | int32_t lnum; | |
553 | ||
554 | err = get_user(lnum, (__user int32_t *)argp); | |
555 | if (err) { | |
556 | err = -EFAULT; | |
557 | break; | |
558 | } | |
559 | err = ubi_is_mapped(desc, lnum); | |
560 | break; | |
561 | } | |
801c135c | 562 | |
f089c0b2 | 563 | /* Set volume property command */ |
766fb95b SA |
564 | case UBI_IOCSETPROP: |
565 | { | |
566 | struct ubi_set_prop_req req; | |
567 | ||
568 | err = copy_from_user(&req, argp, | |
569 | sizeof(struct ubi_set_prop_req)); | |
570 | if (err) { | |
571 | err = -EFAULT; | |
572 | break; | |
573 | } | |
574 | switch (req.property) { | |
575 | case UBI_PROP_DIRECT_WRITE: | |
f089c0b2 | 576 | mutex_lock(&ubi->device_mutex); |
766fb95b | 577 | desc->vol->direct_writes = !!req.value; |
f089c0b2 | 578 | mutex_unlock(&ubi->device_mutex); |
766fb95b SA |
579 | break; |
580 | default: | |
581 | err = -EINVAL; | |
582 | break; | |
583 | } | |
584 | break; | |
585 | } | |
586 | ||
801c135c AB |
587 | default: |
588 | err = -ENOTTY; | |
589 | break; | |
590 | } | |
801c135c AB |
591 | return err; |
592 | } | |
593 | ||
594 | /** | |
595 | * verify_mkvol_req - verify volume creation request. | |
596 | * @ubi: UBI device description object | |
597 | * @req: the request to check | |
598 | * | |
599 | * This function zero if the request is correct, and %-EINVAL if not. | |
600 | */ | |
601 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
602 | const struct ubi_mkvol_req *req) | |
603 | { | |
604 | int n, err = -EINVAL; | |
605 | ||
606 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
607 | req->name_len < 0) | |
608 | goto bad; | |
609 | ||
610 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
611 | req->vol_id != UBI_VOL_NUM_AUTO) | |
612 | goto bad; | |
613 | ||
614 | if (req->alignment == 0) | |
615 | goto bad; | |
616 | ||
617 | if (req->bytes == 0) | |
618 | goto bad; | |
619 | ||
620 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
621 | req->vol_type != UBI_STATIC_VOLUME) | |
622 | goto bad; | |
623 | ||
624 | if (req->alignment > ubi->leb_size) | |
625 | goto bad; | |
626 | ||
cadb40cc | 627 | n = req->alignment & (ubi->min_io_size - 1); |
801c135c AB |
628 | if (req->alignment != 1 && n) |
629 | goto bad; | |
630 | ||
631 | if (req->name_len > UBI_VOL_NAME_MAX) { | |
632 | err = -ENAMETOOLONG; | |
633 | goto bad; | |
634 | } | |
635 | ||
a6ea4407 AB |
636 | n = strnlen(req->name, req->name_len + 1); |
637 | if (n != req->name_len) | |
638 | goto bad; | |
639 | ||
801c135c AB |
640 | return 0; |
641 | ||
642 | bad: | |
643 | dbg_err("bad volume creation request"); | |
644 | ubi_dbg_dump_mkvol_req(req); | |
645 | return err; | |
646 | } | |
647 | ||
648 | /** | |
649 | * verify_rsvol_req - verify volume re-size request. | |
650 | * @ubi: UBI device description object | |
651 | * @req: the request to check | |
652 | * | |
653 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
654 | */ | |
655 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
656 | const struct ubi_rsvol_req *req) | |
657 | { | |
658 | if (req->bytes <= 0) | |
659 | return -EINVAL; | |
660 | ||
661 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
662 | return -EINVAL; | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
f40ac9cd AB |
667 | /** |
668 | * rename_volumes - rename UBI volumes. | |
669 | * @ubi: UBI device description object | |
670 | * @req: volumes re-name request | |
671 | * | |
672 | * This is a helper function for the volume re-name IOCTL which validates the | |
673 | * the request, opens the volume and calls corresponding volumes management | |
674 | * function. Returns zero in case of success and a negative error code in case | |
675 | * of failure. | |
676 | */ | |
677 | static int rename_volumes(struct ubi_device *ubi, | |
678 | struct ubi_rnvol_req *req) | |
679 | { | |
680 | int i, n, err; | |
681 | struct list_head rename_list; | |
682 | struct ubi_rename_entry *re, *re1; | |
683 | ||
684 | if (req->count < 0 || req->count > UBI_MAX_RNVOL) | |
685 | return -EINVAL; | |
686 | ||
687 | if (req->count == 0) | |
688 | return 0; | |
689 | ||
690 | /* Validate volume IDs and names in the request */ | |
691 | for (i = 0; i < req->count; i++) { | |
692 | if (req->ents[i].vol_id < 0 || | |
693 | req->ents[i].vol_id >= ubi->vtbl_slots) | |
694 | return -EINVAL; | |
695 | if (req->ents[i].name_len < 0) | |
696 | return -EINVAL; | |
697 | if (req->ents[i].name_len > UBI_VOL_NAME_MAX) | |
698 | return -ENAMETOOLONG; | |
699 | req->ents[i].name[req->ents[i].name_len] = '\0'; | |
700 | n = strlen(req->ents[i].name); | |
701 | if (n != req->ents[i].name_len) | |
702 | err = -EINVAL; | |
703 | } | |
704 | ||
705 | /* Make sure volume IDs and names are unique */ | |
706 | for (i = 0; i < req->count - 1; i++) { | |
707 | for (n = i + 1; n < req->count; n++) { | |
708 | if (req->ents[i].vol_id == req->ents[n].vol_id) { | |
709 | dbg_err("duplicated volume id %d", | |
710 | req->ents[i].vol_id); | |
711 | return -EINVAL; | |
712 | } | |
713 | if (!strcmp(req->ents[i].name, req->ents[n].name)) { | |
714 | dbg_err("duplicated volume name \"%s\"", | |
715 | req->ents[i].name); | |
716 | return -EINVAL; | |
717 | } | |
718 | } | |
719 | } | |
720 | ||
721 | /* Create the re-name list */ | |
722 | INIT_LIST_HEAD(&rename_list); | |
723 | for (i = 0; i < req->count; i++) { | |
724 | int vol_id = req->ents[i].vol_id; | |
725 | int name_len = req->ents[i].name_len; | |
726 | const char *name = req->ents[i].name; | |
727 | ||
728 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
729 | if (!re) { | |
730 | err = -ENOMEM; | |
731 | goto out_free; | |
732 | } | |
733 | ||
734 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
735 | if (IS_ERR(re->desc)) { | |
736 | err = PTR_ERR(re->desc); | |
737 | dbg_err("cannot open volume %d, error %d", vol_id, err); | |
738 | kfree(re); | |
739 | goto out_free; | |
740 | } | |
741 | ||
742 | /* Skip this re-naming if the name does not really change */ | |
743 | if (re->desc->vol->name_len == name_len && | |
744 | !memcmp(re->desc->vol->name, name, name_len)) { | |
745 | ubi_close_volume(re->desc); | |
746 | kfree(re); | |
747 | continue; | |
748 | } | |
749 | ||
750 | re->new_name_len = name_len; | |
751 | memcpy(re->new_name, name, name_len); | |
752 | list_add_tail(&re->list, &rename_list); | |
753 | dbg_msg("will rename volume %d from \"%s\" to \"%s\"", | |
754 | vol_id, re->desc->vol->name, name); | |
755 | } | |
756 | ||
757 | if (list_empty(&rename_list)) | |
758 | return 0; | |
759 | ||
760 | /* Find out the volumes which have to be removed */ | |
761 | list_for_each_entry(re, &rename_list, list) { | |
762 | struct ubi_volume_desc *desc; | |
763 | int no_remove_needed = 0; | |
764 | ||
765 | /* | |
766 | * Volume @re->vol_id is going to be re-named to | |
767 | * @re->new_name, while its current name is @name. If a volume | |
768 | * with name @re->new_name currently exists, it has to be | |
769 | * removed, unless it is also re-named in the request (@req). | |
770 | */ | |
771 | list_for_each_entry(re1, &rename_list, list) { | |
772 | if (re->new_name_len == re1->desc->vol->name_len && | |
773 | !memcmp(re->new_name, re1->desc->vol->name, | |
774 | re1->desc->vol->name_len)) { | |
775 | no_remove_needed = 1; | |
776 | break; | |
777 | } | |
778 | } | |
779 | ||
780 | if (no_remove_needed) | |
781 | continue; | |
782 | ||
783 | /* | |
784 | * It seems we need to remove volume with name @re->new_name, | |
785 | * if it exists. | |
786 | */ | |
f2863c54 AB |
787 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, |
788 | UBI_EXCLUSIVE); | |
f40ac9cd AB |
789 | if (IS_ERR(desc)) { |
790 | err = PTR_ERR(desc); | |
791 | if (err == -ENODEV) | |
792 | /* Re-naming into a non-existing volume name */ | |
793 | continue; | |
794 | ||
795 | /* The volume exists but busy, or an error occurred */ | |
796 | dbg_err("cannot open volume \"%s\", error %d", | |
797 | re->new_name, err); | |
798 | goto out_free; | |
799 | } | |
800 | ||
01ebc12f JL |
801 | re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
802 | if (!re1) { | |
f40ac9cd AB |
803 | err = -ENOMEM; |
804 | ubi_close_volume(desc); | |
805 | goto out_free; | |
806 | } | |
807 | ||
01ebc12f JL |
808 | re1->remove = 1; |
809 | re1->desc = desc; | |
810 | list_add(&re1->list, &rename_list); | |
f40ac9cd | 811 | dbg_msg("will remove volume %d, name \"%s\"", |
01ebc12f | 812 | re1->desc->vol->vol_id, re1->desc->vol->name); |
f40ac9cd AB |
813 | } |
814 | ||
f089c0b2 | 815 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 816 | err = ubi_rename_volumes(ubi, &rename_list); |
f089c0b2 | 817 | mutex_unlock(&ubi->device_mutex); |
f40ac9cd AB |
818 | |
819 | out_free: | |
820 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
821 | ubi_close_volume(re->desc); | |
822 | list_del(&re->list); | |
823 | kfree(re); | |
824 | } | |
825 | return err; | |
826 | } | |
827 | ||
f429b2ea AB |
828 | static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, |
829 | unsigned long arg) | |
801c135c AB |
830 | { |
831 | int err = 0; | |
832 | struct ubi_device *ubi; | |
833 | struct ubi_volume_desc *desc; | |
834 | void __user *argp = (void __user *)arg; | |
835 | ||
801c135c AB |
836 | if (!capable(CAP_SYS_RESOURCE)) |
837 | return -EPERM; | |
838 | ||
f429b2ea | 839 | ubi = ubi_get_by_major(imajor(file->f_mapping->host)); |
e73f4459 AB |
840 | if (!ubi) |
841 | return -ENODEV; | |
801c135c AB |
842 | |
843 | switch (cmd) { | |
844 | /* Create volume command */ | |
845 | case UBI_IOCMKVOL: | |
846 | { | |
847 | struct ubi_mkvol_req req; | |
848 | ||
c8566350 | 849 | dbg_gen("create volume"); |
897a316c | 850 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
851 | if (err) { |
852 | err = -EFAULT; | |
853 | break; | |
854 | } | |
855 | ||
856 | err = verify_mkvol_req(ubi, &req); | |
857 | if (err) | |
858 | break; | |
859 | ||
f089c0b2 | 860 | mutex_lock(&ubi->device_mutex); |
801c135c | 861 | err = ubi_create_volume(ubi, &req); |
f089c0b2 | 862 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
863 | if (err) |
864 | break; | |
865 | ||
bf07803a | 866 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
867 | if (err) |
868 | err = -EFAULT; | |
869 | ||
870 | break; | |
871 | } | |
872 | ||
873 | /* Remove volume command */ | |
874 | case UBI_IOCRMVOL: | |
875 | { | |
876 | int vol_id; | |
877 | ||
c8566350 | 878 | dbg_gen("remove volume"); |
bf07803a | 879 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
880 | if (err) { |
881 | err = -EFAULT; | |
882 | break; | |
883 | } | |
884 | ||
885 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
886 | if (IS_ERR(desc)) { | |
887 | err = PTR_ERR(desc); | |
888 | break; | |
889 | } | |
890 | ||
f089c0b2 | 891 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 892 | err = ubi_remove_volume(desc, 0); |
f089c0b2 | 893 | mutex_unlock(&ubi->device_mutex); |
40e4d0c1 | 894 | |
450f872a | 895 | /* |
40e4d0c1 AB |
896 | * The volume is deleted (unless an error occurred), and the |
897 | * 'struct ubi_volume' object will be freed when | |
898 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
899 | */ |
900 | ubi_close_volume(desc); | |
801c135c AB |
901 | break; |
902 | } | |
903 | ||
904 | /* Re-size volume command */ | |
905 | case UBI_IOCRSVOL: | |
906 | { | |
907 | int pebs; | |
801c135c AB |
908 | struct ubi_rsvol_req req; |
909 | ||
c8566350 | 910 | dbg_gen("re-size volume"); |
897a316c | 911 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
912 | if (err) { |
913 | err = -EFAULT; | |
914 | break; | |
915 | } | |
916 | ||
917 | err = verify_rsvol_req(ubi, &req); | |
918 | if (err) | |
919 | break; | |
920 | ||
921 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
922 | if (IS_ERR(desc)) { | |
923 | err = PTR_ERR(desc); | |
924 | break; | |
925 | } | |
926 | ||
3013ee31 AB |
927 | pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, |
928 | desc->vol->usable_leb_size); | |
801c135c | 929 | |
f089c0b2 | 930 | mutex_lock(&ubi->device_mutex); |
801c135c | 931 | err = ubi_resize_volume(desc, pebs); |
f089c0b2 | 932 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
933 | ubi_close_volume(desc); |
934 | break; | |
935 | } | |
936 | ||
f40ac9cd AB |
937 | /* Re-name volumes command */ |
938 | case UBI_IOCRNVOL: | |
939 | { | |
940 | struct ubi_rnvol_req *req; | |
941 | ||
942 | dbg_msg("re-name volumes"); | |
943 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); | |
944 | if (!req) { | |
945 | err = -ENOMEM; | |
946 | break; | |
947 | }; | |
948 | ||
949 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
950 | if (err) { | |
951 | err = -EFAULT; | |
952 | kfree(req); | |
953 | break; | |
954 | } | |
955 | ||
f40ac9cd | 956 | err = rename_volumes(ubi, req); |
f40ac9cd AB |
957 | kfree(req); |
958 | break; | |
959 | } | |
960 | ||
801c135c AB |
961 | default: |
962 | err = -ENOTTY; | |
963 | break; | |
964 | } | |
965 | ||
e73f4459 | 966 | ubi_put_device(ubi); |
801c135c AB |
967 | return err; |
968 | } | |
969 | ||
f429b2ea AB |
970 | static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, |
971 | unsigned long arg) | |
897a316c AB |
972 | { |
973 | int err = 0; | |
974 | void __user *argp = (void __user *)arg; | |
975 | ||
976 | if (!capable(CAP_SYS_RESOURCE)) | |
977 | return -EPERM; | |
978 | ||
979 | switch (cmd) { | |
980 | /* Attach an MTD device command */ | |
981 | case UBI_IOCATT: | |
982 | { | |
983 | struct ubi_attach_req req; | |
984 | struct mtd_info *mtd; | |
985 | ||
c8566350 | 986 | dbg_gen("attach MTD device"); |
897a316c AB |
987 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
988 | if (err) { | |
989 | err = -EFAULT; | |
990 | break; | |
991 | } | |
992 | ||
993 | if (req.mtd_num < 0 || | |
994 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
995 | err = -EINVAL; | |
996 | break; | |
997 | } | |
998 | ||
999 | mtd = get_mtd_device(NULL, req.mtd_num); | |
1000 | if (IS_ERR(mtd)) { | |
1001 | err = PTR_ERR(mtd); | |
1002 | break; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Note, further request verification is done by | |
1007 | * 'ubi_attach_mtd_dev()'. | |
1008 | */ | |
1009 | mutex_lock(&ubi_devices_mutex); | |
1010 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset); | |
1011 | mutex_unlock(&ubi_devices_mutex); | |
1012 | if (err < 0) | |
1013 | put_mtd_device(mtd); | |
1014 | else | |
1015 | /* @err contains UBI device number */ | |
1016 | err = put_user(err, (__user int32_t *)argp); | |
1017 | ||
1018 | break; | |
1019 | } | |
1020 | ||
1021 | /* Detach an MTD device command */ | |
1022 | case UBI_IOCDET: | |
1023 | { | |
1024 | int ubi_num; | |
1025 | ||
c8566350 | 1026 | dbg_gen("dettach MTD device"); |
897a316c AB |
1027 | err = get_user(ubi_num, (__user int32_t *)argp); |
1028 | if (err) { | |
1029 | err = -EFAULT; | |
1030 | break; | |
1031 | } | |
1032 | ||
1033 | mutex_lock(&ubi_devices_mutex); | |
1034 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
1035 | mutex_unlock(&ubi_devices_mutex); | |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | default: | |
1040 | err = -ENOTTY; | |
1041 | break; | |
1042 | } | |
1043 | ||
1044 | return err; | |
1045 | } | |
1046 | ||
f429b2ea AB |
1047 | #ifdef CONFIG_COMPAT |
1048 | static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1049 | unsigned long arg) | |
1050 | { | |
1051 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1052 | ||
1053 | return vol_cdev_ioctl(file, cmd, translated_arg); | |
1054 | } | |
1055 | ||
1056 | static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1057 | unsigned long arg) | |
1058 | { | |
1059 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1060 | ||
1061 | return ubi_cdev_ioctl(file, cmd, translated_arg); | |
1062 | } | |
1063 | ||
1064 | static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1065 | unsigned long arg) | |
1066 | { | |
1067 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1068 | ||
1069 | return ctrl_cdev_ioctl(file, cmd, translated_arg); | |
1070 | } | |
1071 | #else | |
1072 | #define vol_cdev_compat_ioctl NULL | |
1073 | #define ubi_cdev_compat_ioctl NULL | |
1074 | #define ctrl_cdev_compat_ioctl NULL | |
1075 | #endif | |
1076 | ||
1077 | /* UBI volume character device operations */ | |
1078 | const struct file_operations ubi_vol_cdev_operations = { | |
1079 | .owner = THIS_MODULE, | |
1080 | .open = vol_cdev_open, | |
1081 | .release = vol_cdev_release, | |
1082 | .llseek = vol_cdev_llseek, | |
1083 | .read = vol_cdev_read, | |
1084 | .write = vol_cdev_write, | |
1b24bc3a | 1085 | .fsync = vol_cdev_fsync, |
f429b2ea AB |
1086 | .unlocked_ioctl = vol_cdev_ioctl, |
1087 | .compat_ioctl = vol_cdev_compat_ioctl, | |
9f961b57 AB |
1088 | }; |
1089 | ||
801c135c | 1090 | /* UBI character device operations */ |
4d187a88 | 1091 | const struct file_operations ubi_cdev_operations = { |
f429b2ea AB |
1092 | .owner = THIS_MODULE, |
1093 | .llseek = no_llseek, | |
1094 | .unlocked_ioctl = ubi_cdev_ioctl, | |
1095 | .compat_ioctl = ubi_cdev_compat_ioctl, | |
801c135c AB |
1096 | }; |
1097 | ||
f429b2ea AB |
1098 | /* UBI control character device operations */ |
1099 | const struct file_operations ubi_ctrl_cdev_operations = { | |
1100 | .owner = THIS_MODULE, | |
1101 | .unlocked_ioctl = ctrl_cdev_ioctl, | |
1102 | .compat_ioctl = ctrl_cdev_compat_ioctl, | |
6038f373 | 1103 | .llseek = noop_llseek, |
801c135c | 1104 | }; |