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> | |
40 | #include <linux/ioctl.h> | |
41 | #include <linux/capability.h> | |
72b67048 | 42 | #include <linux/smp_lock.h> |
801c135c AB |
43 | #include <mtd/ubi-user.h> |
44 | #include <asm/uaccess.h> | |
45 | #include <asm/div64.h> | |
46 | #include "ubi.h" | |
47 | ||
801c135c AB |
48 | /** |
49 | * get_exclusive - get exclusive access to an UBI volume. | |
50 | * @desc: volume descriptor | |
51 | * | |
52 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
53 | * mode value (positive integer) in case of success and a negative error code | |
54 | * in case of failure. | |
55 | */ | |
56 | static int get_exclusive(struct ubi_volume_desc *desc) | |
57 | { | |
58 | int users, err; | |
59 | struct ubi_volume *vol = desc->vol; | |
60 | ||
61 | spin_lock(&vol->ubi->volumes_lock); | |
62 | users = vol->readers + vol->writers + vol->exclusive; | |
63 | ubi_assert(users > 0); | |
64 | if (users > 1) { | |
65 | dbg_err("%d users for volume %d", users, vol->vol_id); | |
66 | err = -EBUSY; | |
67 | } else { | |
68 | vol->readers = vol->writers = 0; | |
69 | vol->exclusive = 1; | |
70 | err = desc->mode; | |
71 | desc->mode = UBI_EXCLUSIVE; | |
72 | } | |
73 | spin_unlock(&vol->ubi->volumes_lock); | |
74 | ||
75 | return err; | |
76 | } | |
77 | ||
78 | /** | |
79 | * revoke_exclusive - revoke exclusive mode. | |
80 | * @desc: volume descriptor | |
81 | * @mode: new mode to switch to | |
82 | */ | |
83 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
84 | { | |
85 | struct ubi_volume *vol = desc->vol; | |
86 | ||
87 | spin_lock(&vol->ubi->volumes_lock); | |
88 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
89 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
90 | vol->exclusive = 0; | |
91 | if (mode == UBI_READONLY) | |
92 | vol->readers = 1; | |
93 | else if (mode == UBI_READWRITE) | |
94 | vol->writers = 1; | |
95 | else | |
96 | vol->exclusive = 1; | |
97 | spin_unlock(&vol->ubi->volumes_lock); | |
98 | ||
99 | desc->mode = mode; | |
100 | } | |
101 | ||
102 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
103 | { | |
104 | struct ubi_volume_desc *desc; | |
e73f4459 AB |
105 | int vol_id = iminor(inode) - 1, mode, ubi_num; |
106 | ||
72b67048 | 107 | lock_kernel(); |
e73f4459 | 108 | ubi_num = ubi_major2num(imajor(inode)); |
72b67048 JC |
109 | if (ubi_num < 0) { |
110 | unlock_kernel(); | |
e73f4459 | 111 | return ubi_num; |
72b67048 | 112 | } |
801c135c AB |
113 | |
114 | if (file->f_mode & FMODE_WRITE) | |
115 | mode = UBI_READWRITE; | |
116 | else | |
117 | mode = UBI_READONLY; | |
118 | ||
c8566350 | 119 | dbg_gen("open volume %d, mode %d", vol_id, mode); |
801c135c | 120 | |
e73f4459 | 121 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
72b67048 | 122 | unlock_kernel(); |
801c135c AB |
123 | if (IS_ERR(desc)) |
124 | return PTR_ERR(desc); | |
125 | ||
126 | file->private_data = desc; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
131 | { | |
132 | struct ubi_volume_desc *desc = file->private_data; | |
133 | struct ubi_volume *vol = desc->vol; | |
134 | ||
c8566350 | 135 | dbg_gen("release volume %d, mode %d", vol->vol_id, desc->mode); |
801c135c AB |
136 | |
137 | if (vol->updating) { | |
138 | ubi_warn("update of volume %d not finished, volume is damaged", | |
139 | vol->vol_id); | |
e653879c | 140 | ubi_assert(!vol->changing_leb); |
801c135c | 141 | vol->updating = 0; |
92ad8f37 | 142 | vfree(vol->upd_buf); |
e653879c | 143 | } else if (vol->changing_leb) { |
c8566350 | 144 | dbg_gen("only %lld of %lld bytes received for atomic LEB change" |
e653879c AB |
145 | " for volume %d:%d, cancel", vol->upd_received, |
146 | vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id); | |
147 | vol->changing_leb = 0; | |
148 | vfree(vol->upd_buf); | |
801c135c AB |
149 | } |
150 | ||
151 | ubi_close_volume(desc); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
156 | { | |
157 | struct ubi_volume_desc *desc = file->private_data; | |
158 | struct ubi_volume *vol = desc->vol; | |
159 | loff_t new_offset; | |
160 | ||
161 | if (vol->updating) { | |
162 | /* Update is in progress, seeking is prohibited */ | |
163 | dbg_err("updating"); | |
164 | return -EBUSY; | |
165 | } | |
166 | ||
167 | switch (origin) { | |
168 | case 0: /* SEEK_SET */ | |
169 | new_offset = offset; | |
170 | break; | |
171 | case 1: /* SEEK_CUR */ | |
172 | new_offset = file->f_pos + offset; | |
173 | break; | |
174 | case 2: /* SEEK_END */ | |
175 | new_offset = vol->used_bytes + offset; | |
176 | break; | |
177 | default: | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
182 | dbg_err("bad seek %lld", new_offset); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
c8566350 | 186 | dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld", |
801c135c AB |
187 | vol->vol_id, offset, origin, new_offset); |
188 | ||
189 | file->f_pos = new_offset; | |
190 | return new_offset; | |
191 | } | |
192 | ||
193 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, | |
194 | loff_t *offp) | |
195 | { | |
196 | struct ubi_volume_desc *desc = file->private_data; | |
197 | struct ubi_volume *vol = desc->vol; | |
198 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 199 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
200 | size_t count_save = count; |
201 | void *tbuf; | |
202 | uint64_t tmp; | |
203 | ||
c8566350 | 204 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 205 | count, *offp, vol->vol_id); |
801c135c AB |
206 | |
207 | if (vol->updating) { | |
208 | dbg_err("updating"); | |
209 | return -EBUSY; | |
210 | } | |
211 | if (vol->upd_marker) { | |
212 | dbg_err("damaged volume, update marker is set"); | |
213 | return -EBADF; | |
214 | } | |
215 | if (*offp == vol->used_bytes || count == 0) | |
216 | return 0; | |
217 | ||
218 | if (vol->corrupted) | |
c8566350 | 219 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
220 | |
221 | if (*offp + count > vol->used_bytes) | |
222 | count_save = count = vol->used_bytes - *offp; | |
223 | ||
224 | tbuf_size = vol->usable_leb_size; | |
225 | if (count < tbuf_size) | |
226 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 227 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
228 | if (!tbuf) |
229 | return -ENOMEM; | |
230 | ||
231 | len = count > tbuf_size ? tbuf_size : count; | |
232 | ||
233 | tmp = *offp; | |
234 | off = do_div(tmp, vol->usable_leb_size); | |
235 | lnum = tmp; | |
236 | ||
237 | do { | |
238 | cond_resched(); | |
239 | ||
240 | if (off + len >= vol->usable_leb_size) | |
241 | len = vol->usable_leb_size - off; | |
242 | ||
89b96b69 | 243 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
244 | if (err) |
245 | break; | |
246 | ||
247 | off += len; | |
248 | if (off == vol->usable_leb_size) { | |
249 | lnum += 1; | |
250 | off -= vol->usable_leb_size; | |
251 | } | |
252 | ||
253 | count -= len; | |
254 | *offp += len; | |
255 | ||
256 | err = copy_to_user(buf, tbuf, len); | |
257 | if (err) { | |
258 | err = -EFAULT; | |
259 | break; | |
260 | } | |
261 | ||
262 | buf += len; | |
263 | len = count > tbuf_size ? tbuf_size : count; | |
264 | } while (count); | |
265 | ||
92ad8f37 | 266 | vfree(tbuf); |
801c135c AB |
267 | return err ? err : count_save - count; |
268 | } | |
269 | ||
270 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
271 | ||
272 | /* | |
273 | * This function allows to directly write to dynamic UBI volumes, without | |
274 | * issuing the volume update operation. Available only as a debugging feature. | |
275 | * Very useful for testing UBI. | |
276 | */ | |
277 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
278 | size_t count, loff_t *offp) | |
279 | { | |
280 | struct ubi_volume_desc *desc = file->private_data; | |
281 | struct ubi_volume *vol = desc->vol; | |
282 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 283 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
284 | size_t count_save = count; |
285 | char *tbuf; | |
286 | uint64_t tmp; | |
287 | ||
c8566350 | 288 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 289 | count, *offp, vol->vol_id); |
801c135c AB |
290 | |
291 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
292 | return -EROFS; | |
293 | ||
294 | tmp = *offp; | |
295 | off = do_div(tmp, vol->usable_leb_size); | |
296 | lnum = tmp; | |
297 | ||
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 | ||
354 | #else | |
355 | #define vol_cdev_direct_write(file, buf, count, offp) -EPERM | |
356 | #endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */ | |
357 | ||
358 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, | |
359 | size_t count, loff_t *offp) | |
360 | { | |
361 | int err = 0; | |
362 | struct ubi_volume_desc *desc = file->private_data; | |
363 | struct ubi_volume *vol = desc->vol; | |
364 | struct ubi_device *ubi = vol->ubi; | |
365 | ||
e653879c | 366 | if (!vol->updating && !vol->changing_leb) |
801c135c AB |
367 | return vol_cdev_direct_write(file, buf, count, offp); |
368 | ||
e653879c AB |
369 | if (vol->updating) |
370 | err = ubi_more_update_data(ubi, vol, buf, count); | |
371 | else | |
372 | err = ubi_more_leb_change_data(ubi, vol, buf, count); | |
373 | ||
801c135c | 374 | if (err < 0) { |
e653879c | 375 | ubi_err("cannot accept more %zd bytes of data, error %d", |
01f7b309 | 376 | count, err); |
801c135c AB |
377 | return err; |
378 | } | |
379 | ||
380 | if (err) { | |
381 | /* | |
e653879c AB |
382 | * The operation is finished, @err contains number of actually |
383 | * written bytes. | |
801c135c AB |
384 | */ |
385 | count = err; | |
386 | ||
e653879c AB |
387 | if (vol->changing_leb) { |
388 | revoke_exclusive(desc, UBI_READWRITE); | |
389 | return count; | |
390 | } | |
391 | ||
801c135c AB |
392 | err = ubi_check_volume(ubi, vol->vol_id); |
393 | if (err < 0) | |
394 | return err; | |
395 | ||
396 | if (err) { | |
397 | ubi_warn("volume %d on UBI device %d is corrupted", | |
398 | vol->vol_id, ubi->ubi_num); | |
399 | vol->corrupted = 1; | |
400 | } | |
401 | vol->checked = 1; | |
941dfb07 | 402 | ubi_gluebi_updated(vol); |
801c135c AB |
403 | revoke_exclusive(desc, UBI_READWRITE); |
404 | } | |
405 | ||
801c135c AB |
406 | return count; |
407 | } | |
408 | ||
409 | static int vol_cdev_ioctl(struct inode *inode, struct file *file, | |
410 | unsigned int cmd, unsigned long arg) | |
411 | { | |
412 | int err = 0; | |
413 | struct ubi_volume_desc *desc = file->private_data; | |
414 | struct ubi_volume *vol = desc->vol; | |
415 | struct ubi_device *ubi = vol->ubi; | |
416 | void __user *argp = (void __user *)arg; | |
417 | ||
801c135c | 418 | switch (cmd) { |
801c135c AB |
419 | /* Volume update command */ |
420 | case UBI_IOCVOLUP: | |
421 | { | |
422 | int64_t bytes, rsvd_bytes; | |
423 | ||
424 | if (!capable(CAP_SYS_RESOURCE)) { | |
425 | err = -EPERM; | |
426 | break; | |
427 | } | |
428 | ||
429 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
430 | if (err) { | |
431 | err = -EFAULT; | |
432 | break; | |
433 | } | |
434 | ||
435 | if (desc->mode == UBI_READONLY) { | |
436 | err = -EROFS; | |
437 | break; | |
438 | } | |
439 | ||
73789a3d BL |
440 | rsvd_bytes = (long long)vol->reserved_pebs * |
441 | ubi->leb_size-vol->data_pad; | |
801c135c AB |
442 | if (bytes < 0 || bytes > rsvd_bytes) { |
443 | err = -EINVAL; | |
444 | break; | |
445 | } | |
446 | ||
447 | err = get_exclusive(desc); | |
448 | if (err < 0) | |
449 | break; | |
450 | ||
1b68d0ee | 451 | err = ubi_start_update(ubi, vol, bytes); |
801c135c AB |
452 | if (bytes == 0) |
453 | revoke_exclusive(desc, UBI_READWRITE); | |
801c135c AB |
454 | break; |
455 | } | |
456 | ||
e653879c AB |
457 | /* Atomic logical eraseblock change command */ |
458 | case UBI_IOCEBCH: | |
459 | { | |
460 | struct ubi_leb_change_req req; | |
461 | ||
462 | err = copy_from_user(&req, argp, | |
463 | sizeof(struct ubi_leb_change_req)); | |
464 | if (err) { | |
465 | err = -EFAULT; | |
466 | break; | |
467 | } | |
468 | ||
469 | if (desc->mode == UBI_READONLY || | |
470 | vol->vol_type == UBI_STATIC_VOLUME) { | |
471 | err = -EROFS; | |
472 | break; | |
473 | } | |
474 | ||
475 | /* Validate the request */ | |
476 | err = -EINVAL; | |
477 | if (req.lnum < 0 || req.lnum >= vol->reserved_pebs || | |
478 | req.bytes < 0 || req.lnum >= vol->usable_leb_size) | |
479 | break; | |
480 | if (req.dtype != UBI_LONGTERM && req.dtype != UBI_SHORTTERM && | |
481 | req.dtype != UBI_UNKNOWN) | |
482 | break; | |
483 | ||
484 | err = get_exclusive(desc); | |
485 | if (err < 0) | |
486 | break; | |
487 | ||
488 | err = ubi_start_leb_change(ubi, vol, &req); | |
489 | if (req.bytes == 0) | |
490 | revoke_exclusive(desc, UBI_READWRITE); | |
491 | break; | |
492 | } | |
493 | ||
801c135c AB |
494 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO |
495 | /* Logical eraseblock erasure command */ | |
496 | case UBI_IOCEBER: | |
497 | { | |
498 | int32_t lnum; | |
499 | ||
bf07803a | 500 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
501 | if (err) { |
502 | err = -EFAULT; | |
503 | break; | |
504 | } | |
505 | ||
e653879c AB |
506 | if (desc->mode == UBI_READONLY || |
507 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
508 | err = -EROFS; |
509 | break; | |
510 | } | |
511 | ||
512 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
513 | err = -EINVAL; | |
514 | break; | |
515 | } | |
516 | ||
c8566350 | 517 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 518 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
519 | if (err) |
520 | break; | |
521 | ||
522 | err = ubi_wl_flush(ubi); | |
523 | break; | |
524 | } | |
525 | #endif | |
526 | ||
527 | default: | |
528 | err = -ENOTTY; | |
529 | break; | |
530 | } | |
531 | ||
532 | return err; | |
533 | } | |
534 | ||
535 | /** | |
536 | * verify_mkvol_req - verify volume creation request. | |
537 | * @ubi: UBI device description object | |
538 | * @req: the request to check | |
539 | * | |
540 | * This function zero if the request is correct, and %-EINVAL if not. | |
541 | */ | |
542 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
543 | const struct ubi_mkvol_req *req) | |
544 | { | |
545 | int n, err = -EINVAL; | |
546 | ||
547 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
548 | req->name_len < 0) | |
549 | goto bad; | |
550 | ||
551 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
552 | req->vol_id != UBI_VOL_NUM_AUTO) | |
553 | goto bad; | |
554 | ||
555 | if (req->alignment == 0) | |
556 | goto bad; | |
557 | ||
558 | if (req->bytes == 0) | |
559 | goto bad; | |
560 | ||
561 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
562 | req->vol_type != UBI_STATIC_VOLUME) | |
563 | goto bad; | |
564 | ||
565 | if (req->alignment > ubi->leb_size) | |
566 | goto bad; | |
567 | ||
cadb40cc | 568 | n = req->alignment & (ubi->min_io_size - 1); |
801c135c AB |
569 | if (req->alignment != 1 && n) |
570 | goto bad; | |
571 | ||
572 | if (req->name_len > UBI_VOL_NAME_MAX) { | |
573 | err = -ENAMETOOLONG; | |
574 | goto bad; | |
575 | } | |
576 | ||
a6ea4407 AB |
577 | n = strnlen(req->name, req->name_len + 1); |
578 | if (n != req->name_len) | |
579 | goto bad; | |
580 | ||
801c135c AB |
581 | return 0; |
582 | ||
583 | bad: | |
584 | dbg_err("bad volume creation request"); | |
585 | ubi_dbg_dump_mkvol_req(req); | |
586 | return err; | |
587 | } | |
588 | ||
589 | /** | |
590 | * verify_rsvol_req - verify volume re-size request. | |
591 | * @ubi: UBI device description object | |
592 | * @req: the request to check | |
593 | * | |
594 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
595 | */ | |
596 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
597 | const struct ubi_rsvol_req *req) | |
598 | { | |
599 | if (req->bytes <= 0) | |
600 | return -EINVAL; | |
601 | ||
602 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
603 | return -EINVAL; | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
f40ac9cd AB |
608 | /** |
609 | * rename_volumes - rename UBI volumes. | |
610 | * @ubi: UBI device description object | |
611 | * @req: volumes re-name request | |
612 | * | |
613 | * This is a helper function for the volume re-name IOCTL which validates the | |
614 | * the request, opens the volume and calls corresponding volumes management | |
615 | * function. Returns zero in case of success and a negative error code in case | |
616 | * of failure. | |
617 | */ | |
618 | static int rename_volumes(struct ubi_device *ubi, | |
619 | struct ubi_rnvol_req *req) | |
620 | { | |
621 | int i, n, err; | |
622 | struct list_head rename_list; | |
623 | struct ubi_rename_entry *re, *re1; | |
624 | ||
625 | if (req->count < 0 || req->count > UBI_MAX_RNVOL) | |
626 | return -EINVAL; | |
627 | ||
628 | if (req->count == 0) | |
629 | return 0; | |
630 | ||
631 | /* Validate volume IDs and names in the request */ | |
632 | for (i = 0; i < req->count; i++) { | |
633 | if (req->ents[i].vol_id < 0 || | |
634 | req->ents[i].vol_id >= ubi->vtbl_slots) | |
635 | return -EINVAL; | |
636 | if (req->ents[i].name_len < 0) | |
637 | return -EINVAL; | |
638 | if (req->ents[i].name_len > UBI_VOL_NAME_MAX) | |
639 | return -ENAMETOOLONG; | |
640 | req->ents[i].name[req->ents[i].name_len] = '\0'; | |
641 | n = strlen(req->ents[i].name); | |
642 | if (n != req->ents[i].name_len) | |
643 | err = -EINVAL; | |
644 | } | |
645 | ||
646 | /* Make sure volume IDs and names are unique */ | |
647 | for (i = 0; i < req->count - 1; i++) { | |
648 | for (n = i + 1; n < req->count; n++) { | |
649 | if (req->ents[i].vol_id == req->ents[n].vol_id) { | |
650 | dbg_err("duplicated volume id %d", | |
651 | req->ents[i].vol_id); | |
652 | return -EINVAL; | |
653 | } | |
654 | if (!strcmp(req->ents[i].name, req->ents[n].name)) { | |
655 | dbg_err("duplicated volume name \"%s\"", | |
656 | req->ents[i].name); | |
657 | return -EINVAL; | |
658 | } | |
659 | } | |
660 | } | |
661 | ||
662 | /* Create the re-name list */ | |
663 | INIT_LIST_HEAD(&rename_list); | |
664 | for (i = 0; i < req->count; i++) { | |
665 | int vol_id = req->ents[i].vol_id; | |
666 | int name_len = req->ents[i].name_len; | |
667 | const char *name = req->ents[i].name; | |
668 | ||
669 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
670 | if (!re) { | |
671 | err = -ENOMEM; | |
672 | goto out_free; | |
673 | } | |
674 | ||
675 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
676 | if (IS_ERR(re->desc)) { | |
677 | err = PTR_ERR(re->desc); | |
678 | dbg_err("cannot open volume %d, error %d", vol_id, err); | |
679 | kfree(re); | |
680 | goto out_free; | |
681 | } | |
682 | ||
683 | /* Skip this re-naming if the name does not really change */ | |
684 | if (re->desc->vol->name_len == name_len && | |
685 | !memcmp(re->desc->vol->name, name, name_len)) { | |
686 | ubi_close_volume(re->desc); | |
687 | kfree(re); | |
688 | continue; | |
689 | } | |
690 | ||
691 | re->new_name_len = name_len; | |
692 | memcpy(re->new_name, name, name_len); | |
693 | list_add_tail(&re->list, &rename_list); | |
694 | dbg_msg("will rename volume %d from \"%s\" to \"%s\"", | |
695 | vol_id, re->desc->vol->name, name); | |
696 | } | |
697 | ||
698 | if (list_empty(&rename_list)) | |
699 | return 0; | |
700 | ||
701 | /* Find out the volumes which have to be removed */ | |
702 | list_for_each_entry(re, &rename_list, list) { | |
703 | struct ubi_volume_desc *desc; | |
704 | int no_remove_needed = 0; | |
705 | ||
706 | /* | |
707 | * Volume @re->vol_id is going to be re-named to | |
708 | * @re->new_name, while its current name is @name. If a volume | |
709 | * with name @re->new_name currently exists, it has to be | |
710 | * removed, unless it is also re-named in the request (@req). | |
711 | */ | |
712 | list_for_each_entry(re1, &rename_list, list) { | |
713 | if (re->new_name_len == re1->desc->vol->name_len && | |
714 | !memcmp(re->new_name, re1->desc->vol->name, | |
715 | re1->desc->vol->name_len)) { | |
716 | no_remove_needed = 1; | |
717 | break; | |
718 | } | |
719 | } | |
720 | ||
721 | if (no_remove_needed) | |
722 | continue; | |
723 | ||
724 | /* | |
725 | * It seems we need to remove volume with name @re->new_name, | |
726 | * if it exists. | |
727 | */ | |
728 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, UBI_EXCLUSIVE); | |
729 | if (IS_ERR(desc)) { | |
730 | err = PTR_ERR(desc); | |
731 | if (err == -ENODEV) | |
732 | /* Re-naming into a non-existing volume name */ | |
733 | continue; | |
734 | ||
735 | /* The volume exists but busy, or an error occurred */ | |
736 | dbg_err("cannot open volume \"%s\", error %d", | |
737 | re->new_name, err); | |
738 | goto out_free; | |
739 | } | |
740 | ||
741 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
742 | if (!re) { | |
743 | err = -ENOMEM; | |
744 | ubi_close_volume(desc); | |
745 | goto out_free; | |
746 | } | |
747 | ||
748 | re->remove = 1; | |
749 | re->desc = desc; | |
750 | list_add(&re->list, &rename_list); | |
751 | dbg_msg("will remove volume %d, name \"%s\"", | |
752 | re->desc->vol->vol_id, re->desc->vol->name); | |
753 | } | |
754 | ||
755 | mutex_lock(&ubi->volumes_mutex); | |
756 | err = ubi_rename_volumes(ubi, &rename_list); | |
757 | mutex_unlock(&ubi->volumes_mutex); | |
758 | ||
759 | out_free: | |
760 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
761 | ubi_close_volume(re->desc); | |
762 | list_del(&re->list); | |
763 | kfree(re); | |
764 | } | |
765 | return err; | |
766 | } | |
767 | ||
801c135c AB |
768 | static int ubi_cdev_ioctl(struct inode *inode, struct file *file, |
769 | unsigned int cmd, unsigned long arg) | |
770 | { | |
771 | int err = 0; | |
772 | struct ubi_device *ubi; | |
773 | struct ubi_volume_desc *desc; | |
774 | void __user *argp = (void __user *)arg; | |
775 | ||
801c135c AB |
776 | if (!capable(CAP_SYS_RESOURCE)) |
777 | return -EPERM; | |
778 | ||
e73f4459 AB |
779 | ubi = ubi_get_by_major(imajor(inode)); |
780 | if (!ubi) | |
781 | return -ENODEV; | |
801c135c AB |
782 | |
783 | switch (cmd) { | |
784 | /* Create volume command */ | |
785 | case UBI_IOCMKVOL: | |
786 | { | |
787 | struct ubi_mkvol_req req; | |
788 | ||
c8566350 | 789 | dbg_gen("create volume"); |
897a316c | 790 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
791 | if (err) { |
792 | err = -EFAULT; | |
793 | break; | |
794 | } | |
795 | ||
a6ea4407 | 796 | req.name[req.name_len] = '\0'; |
801c135c AB |
797 | err = verify_mkvol_req(ubi, &req); |
798 | if (err) | |
799 | break; | |
800 | ||
40e4d0c1 | 801 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 802 | err = ubi_create_volume(ubi, &req); |
40e4d0c1 | 803 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
804 | if (err) |
805 | break; | |
806 | ||
bf07803a | 807 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
808 | if (err) |
809 | err = -EFAULT; | |
810 | ||
811 | break; | |
812 | } | |
813 | ||
814 | /* Remove volume command */ | |
815 | case UBI_IOCRMVOL: | |
816 | { | |
817 | int vol_id; | |
818 | ||
c8566350 | 819 | dbg_gen("remove volume"); |
bf07803a | 820 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
821 | if (err) { |
822 | err = -EFAULT; | |
823 | break; | |
824 | } | |
825 | ||
826 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
827 | if (IS_ERR(desc)) { | |
828 | err = PTR_ERR(desc); | |
829 | break; | |
830 | } | |
831 | ||
40e4d0c1 | 832 | mutex_lock(&ubi->volumes_mutex); |
f40ac9cd | 833 | err = ubi_remove_volume(desc, 0); |
40e4d0c1 AB |
834 | mutex_unlock(&ubi->volumes_mutex); |
835 | ||
450f872a | 836 | /* |
40e4d0c1 AB |
837 | * The volume is deleted (unless an error occurred), and the |
838 | * 'struct ubi_volume' object will be freed when | |
839 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
840 | */ |
841 | ubi_close_volume(desc); | |
801c135c AB |
842 | break; |
843 | } | |
844 | ||
845 | /* Re-size volume command */ | |
846 | case UBI_IOCRSVOL: | |
847 | { | |
848 | int pebs; | |
849 | uint64_t tmp; | |
850 | struct ubi_rsvol_req req; | |
851 | ||
c8566350 | 852 | dbg_gen("re-size volume"); |
897a316c | 853 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
854 | if (err) { |
855 | err = -EFAULT; | |
856 | break; | |
857 | } | |
858 | ||
859 | err = verify_rsvol_req(ubi, &req); | |
860 | if (err) | |
861 | break; | |
862 | ||
863 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
864 | if (IS_ERR(desc)) { | |
865 | err = PTR_ERR(desc); | |
866 | break; | |
867 | } | |
868 | ||
869 | tmp = req.bytes; | |
870 | pebs = !!do_div(tmp, desc->vol->usable_leb_size); | |
871 | pebs += tmp; | |
872 | ||
40e4d0c1 | 873 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 874 | err = ubi_resize_volume(desc, pebs); |
40e4d0c1 | 875 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
876 | ubi_close_volume(desc); |
877 | break; | |
878 | } | |
879 | ||
f40ac9cd AB |
880 | /* Re-name volumes command */ |
881 | case UBI_IOCRNVOL: | |
882 | { | |
883 | struct ubi_rnvol_req *req; | |
884 | ||
885 | dbg_msg("re-name volumes"); | |
886 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); | |
887 | if (!req) { | |
888 | err = -ENOMEM; | |
889 | break; | |
890 | }; | |
891 | ||
892 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
893 | if (err) { | |
894 | err = -EFAULT; | |
895 | kfree(req); | |
896 | break; | |
897 | } | |
898 | ||
899 | mutex_lock(&ubi->mult_mutex); | |
900 | err = rename_volumes(ubi, req); | |
901 | mutex_unlock(&ubi->mult_mutex); | |
902 | kfree(req); | |
903 | break; | |
904 | } | |
905 | ||
801c135c AB |
906 | default: |
907 | err = -ENOTTY; | |
908 | break; | |
909 | } | |
910 | ||
e73f4459 | 911 | ubi_put_device(ubi); |
801c135c AB |
912 | return err; |
913 | } | |
914 | ||
897a316c AB |
915 | static int ctrl_cdev_ioctl(struct inode *inode, struct file *file, |
916 | unsigned int cmd, unsigned long arg) | |
917 | { | |
918 | int err = 0; | |
919 | void __user *argp = (void __user *)arg; | |
920 | ||
921 | if (!capable(CAP_SYS_RESOURCE)) | |
922 | return -EPERM; | |
923 | ||
924 | switch (cmd) { | |
925 | /* Attach an MTD device command */ | |
926 | case UBI_IOCATT: | |
927 | { | |
928 | struct ubi_attach_req req; | |
929 | struct mtd_info *mtd; | |
930 | ||
c8566350 | 931 | dbg_gen("attach MTD device"); |
897a316c AB |
932 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
933 | if (err) { | |
934 | err = -EFAULT; | |
935 | break; | |
936 | } | |
937 | ||
938 | if (req.mtd_num < 0 || | |
939 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
940 | err = -EINVAL; | |
941 | break; | |
942 | } | |
943 | ||
944 | mtd = get_mtd_device(NULL, req.mtd_num); | |
945 | if (IS_ERR(mtd)) { | |
946 | err = PTR_ERR(mtd); | |
947 | break; | |
948 | } | |
949 | ||
950 | /* | |
951 | * Note, further request verification is done by | |
952 | * 'ubi_attach_mtd_dev()'. | |
953 | */ | |
954 | mutex_lock(&ubi_devices_mutex); | |
955 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset); | |
956 | mutex_unlock(&ubi_devices_mutex); | |
957 | if (err < 0) | |
958 | put_mtd_device(mtd); | |
959 | else | |
960 | /* @err contains UBI device number */ | |
961 | err = put_user(err, (__user int32_t *)argp); | |
962 | ||
963 | break; | |
964 | } | |
965 | ||
966 | /* Detach an MTD device command */ | |
967 | case UBI_IOCDET: | |
968 | { | |
969 | int ubi_num; | |
970 | ||
c8566350 | 971 | dbg_gen("dettach MTD device"); |
897a316c AB |
972 | err = get_user(ubi_num, (__user int32_t *)argp); |
973 | if (err) { | |
974 | err = -EFAULT; | |
975 | break; | |
976 | } | |
977 | ||
978 | mutex_lock(&ubi_devices_mutex); | |
979 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
980 | mutex_unlock(&ubi_devices_mutex); | |
981 | break; | |
982 | } | |
983 | ||
984 | default: | |
985 | err = -ENOTTY; | |
986 | break; | |
987 | } | |
988 | ||
989 | return err; | |
990 | } | |
991 | ||
9f961b57 AB |
992 | /* UBI control character device operations */ |
993 | struct file_operations ubi_ctrl_cdev_operations = { | |
897a316c | 994 | .ioctl = ctrl_cdev_ioctl, |
9f961b57 AB |
995 | .owner = THIS_MODULE, |
996 | }; | |
997 | ||
801c135c AB |
998 | /* UBI character device operations */ |
999 | struct file_operations ubi_cdev_operations = { | |
1000 | .owner = THIS_MODULE, | |
1001 | .ioctl = ubi_cdev_ioctl, | |
f800f09b | 1002 | .llseek = no_llseek, |
801c135c AB |
1003 | }; |
1004 | ||
1005 | /* UBI volume character device operations */ | |
1006 | struct file_operations ubi_vol_cdev_operations = { | |
1007 | .owner = THIS_MODULE, | |
1008 | .open = vol_cdev_open, | |
1009 | .release = vol_cdev_release, | |
1010 | .llseek = vol_cdev_llseek, | |
1011 | .read = vol_cdev_read, | |
1012 | .write = vol_cdev_write, | |
f800f09b | 1013 | .ioctl = vol_cdev_ioctl, |
801c135c | 1014 | }; |