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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> | |
9c9ec147 | 42 | #include <linux/uaccess.h> |
72b67048 | 43 | #include <linux/smp_lock.h> |
801c135c | 44 | #include <mtd/ubi-user.h> |
801c135c AB |
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 | ||
107 | ubi_num = ubi_major2num(imajor(inode)); | |
7d200e88 | 108 | if (ubi_num < 0) |
e73f4459 | 109 | return ubi_num; |
801c135c AB |
110 | |
111 | if (file->f_mode & FMODE_WRITE) | |
112 | mode = UBI_READWRITE; | |
113 | else | |
114 | mode = UBI_READONLY; | |
115 | ||
c8566350 | 116 | dbg_gen("open volume %d, mode %d", vol_id, mode); |
801c135c | 117 | |
e73f4459 | 118 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
801c135c AB |
119 | if (IS_ERR(desc)) |
120 | return PTR_ERR(desc); | |
121 | ||
122 | file->private_data = desc; | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
127 | { | |
128 | struct ubi_volume_desc *desc = file->private_data; | |
129 | struct ubi_volume *vol = desc->vol; | |
130 | ||
c8566350 | 131 | dbg_gen("release volume %d, mode %d", vol->vol_id, desc->mode); |
801c135c AB |
132 | |
133 | if (vol->updating) { | |
134 | ubi_warn("update of volume %d not finished, volume is damaged", | |
135 | vol->vol_id); | |
e653879c | 136 | ubi_assert(!vol->changing_leb); |
801c135c | 137 | vol->updating = 0; |
92ad8f37 | 138 | vfree(vol->upd_buf); |
e653879c | 139 | } else if (vol->changing_leb) { |
c8566350 | 140 | dbg_gen("only %lld of %lld bytes received for atomic LEB change" |
e653879c AB |
141 | " for volume %d:%d, cancel", vol->upd_received, |
142 | vol->upd_bytes, vol->ubi->ubi_num, vol->vol_id); | |
143 | vol->changing_leb = 0; | |
144 | vfree(vol->upd_buf); | |
801c135c AB |
145 | } |
146 | ||
147 | ubi_close_volume(desc); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
152 | { | |
153 | struct ubi_volume_desc *desc = file->private_data; | |
154 | struct ubi_volume *vol = desc->vol; | |
155 | loff_t new_offset; | |
156 | ||
157 | if (vol->updating) { | |
158 | /* Update is in progress, seeking is prohibited */ | |
159 | dbg_err("updating"); | |
160 | return -EBUSY; | |
161 | } | |
162 | ||
163 | switch (origin) { | |
164 | case 0: /* SEEK_SET */ | |
165 | new_offset = offset; | |
166 | break; | |
167 | case 1: /* SEEK_CUR */ | |
168 | new_offset = file->f_pos + offset; | |
169 | break; | |
170 | case 2: /* SEEK_END */ | |
171 | new_offset = vol->used_bytes + offset; | |
172 | break; | |
173 | default: | |
174 | return -EINVAL; | |
175 | } | |
176 | ||
177 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
178 | dbg_err("bad seek %lld", new_offset); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
c8566350 | 182 | dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld", |
801c135c AB |
183 | vol->vol_id, offset, origin, new_offset); |
184 | ||
185 | file->f_pos = new_offset; | |
186 | return new_offset; | |
187 | } | |
188 | ||
189 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, | |
190 | loff_t *offp) | |
191 | { | |
192 | struct ubi_volume_desc *desc = file->private_data; | |
193 | struct ubi_volume *vol = desc->vol; | |
194 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 195 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
196 | size_t count_save = count; |
197 | void *tbuf; | |
198 | uint64_t tmp; | |
199 | ||
c8566350 | 200 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 201 | count, *offp, vol->vol_id); |
801c135c AB |
202 | |
203 | if (vol->updating) { | |
204 | dbg_err("updating"); | |
205 | return -EBUSY; | |
206 | } | |
207 | if (vol->upd_marker) { | |
208 | dbg_err("damaged volume, update marker is set"); | |
209 | return -EBADF; | |
210 | } | |
211 | if (*offp == vol->used_bytes || count == 0) | |
212 | return 0; | |
213 | ||
214 | if (vol->corrupted) | |
c8566350 | 215 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
216 | |
217 | if (*offp + count > vol->used_bytes) | |
218 | count_save = count = vol->used_bytes - *offp; | |
219 | ||
220 | tbuf_size = vol->usable_leb_size; | |
221 | if (count < tbuf_size) | |
222 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 223 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
224 | if (!tbuf) |
225 | return -ENOMEM; | |
226 | ||
227 | len = count > tbuf_size ? tbuf_size : count; | |
228 | ||
229 | tmp = *offp; | |
230 | off = do_div(tmp, vol->usable_leb_size); | |
231 | lnum = tmp; | |
232 | ||
233 | do { | |
234 | cond_resched(); | |
235 | ||
236 | if (off + len >= vol->usable_leb_size) | |
237 | len = vol->usable_leb_size - off; | |
238 | ||
89b96b69 | 239 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
240 | if (err) |
241 | break; | |
242 | ||
243 | off += len; | |
244 | if (off == vol->usable_leb_size) { | |
245 | lnum += 1; | |
246 | off -= vol->usable_leb_size; | |
247 | } | |
248 | ||
249 | count -= len; | |
250 | *offp += len; | |
251 | ||
252 | err = copy_to_user(buf, tbuf, len); | |
253 | if (err) { | |
254 | err = -EFAULT; | |
255 | break; | |
256 | } | |
257 | ||
258 | buf += len; | |
259 | len = count > tbuf_size ? tbuf_size : count; | |
260 | } while (count); | |
261 | ||
92ad8f37 | 262 | vfree(tbuf); |
801c135c AB |
263 | return err ? err : count_save - count; |
264 | } | |
265 | ||
266 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
267 | ||
268 | /* | |
269 | * This function allows to directly write to dynamic UBI volumes, without | |
270 | * issuing the volume update operation. Available only as a debugging feature. | |
271 | * Very useful for testing UBI. | |
272 | */ | |
273 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
274 | size_t count, loff_t *offp) | |
275 | { | |
276 | struct ubi_volume_desc *desc = file->private_data; | |
277 | struct ubi_volume *vol = desc->vol; | |
278 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 279 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
280 | size_t count_save = count; |
281 | char *tbuf; | |
282 | uint64_t tmp; | |
283 | ||
c8566350 | 284 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 285 | count, *offp, vol->vol_id); |
801c135c AB |
286 | |
287 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
288 | return -EROFS; | |
289 | ||
290 | tmp = *offp; | |
291 | off = do_div(tmp, vol->usable_leb_size); | |
292 | lnum = tmp; | |
293 | ||
cadb40cc | 294 | if (off & (ubi->min_io_size - 1)) { |
801c135c AB |
295 | dbg_err("unaligned position"); |
296 | return -EINVAL; | |
297 | } | |
298 | ||
299 | if (*offp + count > vol->used_bytes) | |
300 | count_save = count = vol->used_bytes - *offp; | |
301 | ||
302 | /* We can write only in fractions of the minimum I/O unit */ | |
cadb40cc | 303 | if (count & (ubi->min_io_size - 1)) { |
801c135c AB |
304 | dbg_err("unaligned write length"); |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | tbuf_size = vol->usable_leb_size; | |
309 | if (count < tbuf_size) | |
310 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 311 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
312 | if (!tbuf) |
313 | return -ENOMEM; | |
314 | ||
315 | len = count > tbuf_size ? tbuf_size : count; | |
316 | ||
317 | while (count) { | |
318 | cond_resched(); | |
319 | ||
320 | if (off + len >= vol->usable_leb_size) | |
321 | len = vol->usable_leb_size - off; | |
322 | ||
323 | err = copy_from_user(tbuf, buf, len); | |
324 | if (err) { | |
325 | err = -EFAULT; | |
326 | break; | |
327 | } | |
328 | ||
89b96b69 | 329 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len, |
801c135c AB |
330 | UBI_UNKNOWN); |
331 | if (err) | |
332 | break; | |
333 | ||
334 | off += len; | |
335 | if (off == vol->usable_leb_size) { | |
336 | lnum += 1; | |
337 | off -= vol->usable_leb_size; | |
338 | } | |
339 | ||
340 | count -= len; | |
341 | *offp += len; | |
342 | buf += len; | |
343 | len = count > tbuf_size ? tbuf_size : count; | |
344 | } | |
345 | ||
92ad8f37 | 346 | vfree(tbuf); |
801c135c AB |
347 | return err ? err : count_save - count; |
348 | } | |
349 | ||
350 | #else | |
9c9ec147 | 351 | #define vol_cdev_direct_write(file, buf, count, offp) (-EPERM) |
801c135c AB |
352 | #endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */ |
353 | ||
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; | |
941dfb07 | 398 | ubi_gluebi_updated(vol); |
801c135c AB |
399 | revoke_exclusive(desc, UBI_READWRITE); |
400 | } | |
401 | ||
801c135c AB |
402 | return count; |
403 | } | |
404 | ||
405 | static int vol_cdev_ioctl(struct inode *inode, struct file *file, | |
406 | unsigned int cmd, unsigned long arg) | |
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 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO |
491 | /* Logical eraseblock erasure command */ | |
492 | case UBI_IOCEBER: | |
493 | { | |
494 | int32_t lnum; | |
495 | ||
bf07803a | 496 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
497 | if (err) { |
498 | err = -EFAULT; | |
499 | break; | |
500 | } | |
501 | ||
e653879c AB |
502 | if (desc->mode == UBI_READONLY || |
503 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
504 | err = -EROFS; |
505 | break; | |
506 | } | |
507 | ||
508 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
509 | err = -EINVAL; | |
510 | break; | |
511 | } | |
512 | ||
c8566350 | 513 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 514 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
515 | if (err) |
516 | break; | |
517 | ||
518 | err = ubi_wl_flush(ubi); | |
519 | break; | |
520 | } | |
521 | #endif | |
522 | ||
523 | default: | |
524 | err = -ENOTTY; | |
525 | break; | |
526 | } | |
527 | ||
528 | return err; | |
529 | } | |
530 | ||
531 | /** | |
532 | * verify_mkvol_req - verify volume creation request. | |
533 | * @ubi: UBI device description object | |
534 | * @req: the request to check | |
535 | * | |
536 | * This function zero if the request is correct, and %-EINVAL if not. | |
537 | */ | |
538 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
539 | const struct ubi_mkvol_req *req) | |
540 | { | |
541 | int n, err = -EINVAL; | |
542 | ||
543 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
544 | req->name_len < 0) | |
545 | goto bad; | |
546 | ||
547 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
548 | req->vol_id != UBI_VOL_NUM_AUTO) | |
549 | goto bad; | |
550 | ||
551 | if (req->alignment == 0) | |
552 | goto bad; | |
553 | ||
554 | if (req->bytes == 0) | |
555 | goto bad; | |
556 | ||
557 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
558 | req->vol_type != UBI_STATIC_VOLUME) | |
559 | goto bad; | |
560 | ||
561 | if (req->alignment > ubi->leb_size) | |
562 | goto bad; | |
563 | ||
cadb40cc | 564 | n = req->alignment & (ubi->min_io_size - 1); |
801c135c AB |
565 | if (req->alignment != 1 && n) |
566 | goto bad; | |
567 | ||
568 | if (req->name_len > UBI_VOL_NAME_MAX) { | |
569 | err = -ENAMETOOLONG; | |
570 | goto bad; | |
571 | } | |
572 | ||
a6ea4407 AB |
573 | n = strnlen(req->name, req->name_len + 1); |
574 | if (n != req->name_len) | |
575 | goto bad; | |
576 | ||
801c135c AB |
577 | return 0; |
578 | ||
579 | bad: | |
580 | dbg_err("bad volume creation request"); | |
581 | ubi_dbg_dump_mkvol_req(req); | |
582 | return err; | |
583 | } | |
584 | ||
585 | /** | |
586 | * verify_rsvol_req - verify volume re-size request. | |
587 | * @ubi: UBI device description object | |
588 | * @req: the request to check | |
589 | * | |
590 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
591 | */ | |
592 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
593 | const struct ubi_rsvol_req *req) | |
594 | { | |
595 | if (req->bytes <= 0) | |
596 | return -EINVAL; | |
597 | ||
598 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
599 | return -EINVAL; | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
f40ac9cd AB |
604 | /** |
605 | * rename_volumes - rename UBI volumes. | |
606 | * @ubi: UBI device description object | |
607 | * @req: volumes re-name request | |
608 | * | |
609 | * This is a helper function for the volume re-name IOCTL which validates the | |
610 | * the request, opens the volume and calls corresponding volumes management | |
611 | * function. Returns zero in case of success and a negative error code in case | |
612 | * of failure. | |
613 | */ | |
614 | static int rename_volumes(struct ubi_device *ubi, | |
615 | struct ubi_rnvol_req *req) | |
616 | { | |
617 | int i, n, err; | |
618 | struct list_head rename_list; | |
619 | struct ubi_rename_entry *re, *re1; | |
620 | ||
621 | if (req->count < 0 || req->count > UBI_MAX_RNVOL) | |
622 | return -EINVAL; | |
623 | ||
624 | if (req->count == 0) | |
625 | return 0; | |
626 | ||
627 | /* Validate volume IDs and names in the request */ | |
628 | for (i = 0; i < req->count; i++) { | |
629 | if (req->ents[i].vol_id < 0 || | |
630 | req->ents[i].vol_id >= ubi->vtbl_slots) | |
631 | return -EINVAL; | |
632 | if (req->ents[i].name_len < 0) | |
633 | return -EINVAL; | |
634 | if (req->ents[i].name_len > UBI_VOL_NAME_MAX) | |
635 | return -ENAMETOOLONG; | |
636 | req->ents[i].name[req->ents[i].name_len] = '\0'; | |
637 | n = strlen(req->ents[i].name); | |
638 | if (n != req->ents[i].name_len) | |
639 | err = -EINVAL; | |
640 | } | |
641 | ||
642 | /* Make sure volume IDs and names are unique */ | |
643 | for (i = 0; i < req->count - 1; i++) { | |
644 | for (n = i + 1; n < req->count; n++) { | |
645 | if (req->ents[i].vol_id == req->ents[n].vol_id) { | |
646 | dbg_err("duplicated volume id %d", | |
647 | req->ents[i].vol_id); | |
648 | return -EINVAL; | |
649 | } | |
650 | if (!strcmp(req->ents[i].name, req->ents[n].name)) { | |
651 | dbg_err("duplicated volume name \"%s\"", | |
652 | req->ents[i].name); | |
653 | return -EINVAL; | |
654 | } | |
655 | } | |
656 | } | |
657 | ||
658 | /* Create the re-name list */ | |
659 | INIT_LIST_HEAD(&rename_list); | |
660 | for (i = 0; i < req->count; i++) { | |
661 | int vol_id = req->ents[i].vol_id; | |
662 | int name_len = req->ents[i].name_len; | |
663 | const char *name = req->ents[i].name; | |
664 | ||
665 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
666 | if (!re) { | |
667 | err = -ENOMEM; | |
668 | goto out_free; | |
669 | } | |
670 | ||
671 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
672 | if (IS_ERR(re->desc)) { | |
673 | err = PTR_ERR(re->desc); | |
674 | dbg_err("cannot open volume %d, error %d", vol_id, err); | |
675 | kfree(re); | |
676 | goto out_free; | |
677 | } | |
678 | ||
679 | /* Skip this re-naming if the name does not really change */ | |
680 | if (re->desc->vol->name_len == name_len && | |
681 | !memcmp(re->desc->vol->name, name, name_len)) { | |
682 | ubi_close_volume(re->desc); | |
683 | kfree(re); | |
684 | continue; | |
685 | } | |
686 | ||
687 | re->new_name_len = name_len; | |
688 | memcpy(re->new_name, name, name_len); | |
689 | list_add_tail(&re->list, &rename_list); | |
690 | dbg_msg("will rename volume %d from \"%s\" to \"%s\"", | |
691 | vol_id, re->desc->vol->name, name); | |
692 | } | |
693 | ||
694 | if (list_empty(&rename_list)) | |
695 | return 0; | |
696 | ||
697 | /* Find out the volumes which have to be removed */ | |
698 | list_for_each_entry(re, &rename_list, list) { | |
699 | struct ubi_volume_desc *desc; | |
700 | int no_remove_needed = 0; | |
701 | ||
702 | /* | |
703 | * Volume @re->vol_id is going to be re-named to | |
704 | * @re->new_name, while its current name is @name. If a volume | |
705 | * with name @re->new_name currently exists, it has to be | |
706 | * removed, unless it is also re-named in the request (@req). | |
707 | */ | |
708 | list_for_each_entry(re1, &rename_list, list) { | |
709 | if (re->new_name_len == re1->desc->vol->name_len && | |
710 | !memcmp(re->new_name, re1->desc->vol->name, | |
711 | re1->desc->vol->name_len)) { | |
712 | no_remove_needed = 1; | |
713 | break; | |
714 | } | |
715 | } | |
716 | ||
717 | if (no_remove_needed) | |
718 | continue; | |
719 | ||
720 | /* | |
721 | * It seems we need to remove volume with name @re->new_name, | |
722 | * if it exists. | |
723 | */ | |
724 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, UBI_EXCLUSIVE); | |
725 | if (IS_ERR(desc)) { | |
726 | err = PTR_ERR(desc); | |
727 | if (err == -ENODEV) | |
728 | /* Re-naming into a non-existing volume name */ | |
729 | continue; | |
730 | ||
731 | /* The volume exists but busy, or an error occurred */ | |
732 | dbg_err("cannot open volume \"%s\", error %d", | |
733 | re->new_name, err); | |
734 | goto out_free; | |
735 | } | |
736 | ||
737 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
738 | if (!re) { | |
739 | err = -ENOMEM; | |
740 | ubi_close_volume(desc); | |
741 | goto out_free; | |
742 | } | |
743 | ||
744 | re->remove = 1; | |
745 | re->desc = desc; | |
746 | list_add(&re->list, &rename_list); | |
747 | dbg_msg("will remove volume %d, name \"%s\"", | |
748 | re->desc->vol->vol_id, re->desc->vol->name); | |
749 | } | |
750 | ||
751 | mutex_lock(&ubi->volumes_mutex); | |
752 | err = ubi_rename_volumes(ubi, &rename_list); | |
753 | mutex_unlock(&ubi->volumes_mutex); | |
754 | ||
755 | out_free: | |
756 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
757 | ubi_close_volume(re->desc); | |
758 | list_del(&re->list); | |
759 | kfree(re); | |
760 | } | |
761 | return err; | |
762 | } | |
763 | ||
801c135c AB |
764 | static int ubi_cdev_ioctl(struct inode *inode, struct file *file, |
765 | unsigned int cmd, unsigned long arg) | |
766 | { | |
767 | int err = 0; | |
768 | struct ubi_device *ubi; | |
769 | struct ubi_volume_desc *desc; | |
770 | void __user *argp = (void __user *)arg; | |
771 | ||
801c135c AB |
772 | if (!capable(CAP_SYS_RESOURCE)) |
773 | return -EPERM; | |
774 | ||
e73f4459 AB |
775 | ubi = ubi_get_by_major(imajor(inode)); |
776 | if (!ubi) | |
777 | return -ENODEV; | |
801c135c AB |
778 | |
779 | switch (cmd) { | |
780 | /* Create volume command */ | |
781 | case UBI_IOCMKVOL: | |
782 | { | |
783 | struct ubi_mkvol_req req; | |
784 | ||
c8566350 | 785 | dbg_gen("create volume"); |
897a316c | 786 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
787 | if (err) { |
788 | err = -EFAULT; | |
789 | break; | |
790 | } | |
791 | ||
a6ea4407 | 792 | req.name[req.name_len] = '\0'; |
801c135c AB |
793 | err = verify_mkvol_req(ubi, &req); |
794 | if (err) | |
795 | break; | |
796 | ||
40e4d0c1 | 797 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 798 | err = ubi_create_volume(ubi, &req); |
40e4d0c1 | 799 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
800 | if (err) |
801 | break; | |
802 | ||
bf07803a | 803 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
804 | if (err) |
805 | err = -EFAULT; | |
806 | ||
807 | break; | |
808 | } | |
809 | ||
810 | /* Remove volume command */ | |
811 | case UBI_IOCRMVOL: | |
812 | { | |
813 | int vol_id; | |
814 | ||
c8566350 | 815 | dbg_gen("remove volume"); |
bf07803a | 816 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
817 | if (err) { |
818 | err = -EFAULT; | |
819 | break; | |
820 | } | |
821 | ||
822 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
823 | if (IS_ERR(desc)) { | |
824 | err = PTR_ERR(desc); | |
825 | break; | |
826 | } | |
827 | ||
40e4d0c1 | 828 | mutex_lock(&ubi->volumes_mutex); |
f40ac9cd | 829 | err = ubi_remove_volume(desc, 0); |
40e4d0c1 AB |
830 | mutex_unlock(&ubi->volumes_mutex); |
831 | ||
450f872a | 832 | /* |
40e4d0c1 AB |
833 | * The volume is deleted (unless an error occurred), and the |
834 | * 'struct ubi_volume' object will be freed when | |
835 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
836 | */ |
837 | ubi_close_volume(desc); | |
801c135c AB |
838 | break; |
839 | } | |
840 | ||
841 | /* Re-size volume command */ | |
842 | case UBI_IOCRSVOL: | |
843 | { | |
844 | int pebs; | |
845 | uint64_t tmp; | |
846 | struct ubi_rsvol_req req; | |
847 | ||
c8566350 | 848 | dbg_gen("re-size volume"); |
897a316c | 849 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
850 | if (err) { |
851 | err = -EFAULT; | |
852 | break; | |
853 | } | |
854 | ||
855 | err = verify_rsvol_req(ubi, &req); | |
856 | if (err) | |
857 | break; | |
858 | ||
859 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
860 | if (IS_ERR(desc)) { | |
861 | err = PTR_ERR(desc); | |
862 | break; | |
863 | } | |
864 | ||
865 | tmp = req.bytes; | |
866 | pebs = !!do_div(tmp, desc->vol->usable_leb_size); | |
867 | pebs += tmp; | |
868 | ||
40e4d0c1 | 869 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 870 | err = ubi_resize_volume(desc, pebs); |
40e4d0c1 | 871 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
872 | ubi_close_volume(desc); |
873 | break; | |
874 | } | |
875 | ||
f40ac9cd AB |
876 | /* Re-name volumes command */ |
877 | case UBI_IOCRNVOL: | |
878 | { | |
879 | struct ubi_rnvol_req *req; | |
880 | ||
881 | dbg_msg("re-name volumes"); | |
882 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); | |
883 | if (!req) { | |
884 | err = -ENOMEM; | |
885 | break; | |
886 | }; | |
887 | ||
888 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
889 | if (err) { | |
890 | err = -EFAULT; | |
891 | kfree(req); | |
892 | break; | |
893 | } | |
894 | ||
895 | mutex_lock(&ubi->mult_mutex); | |
896 | err = rename_volumes(ubi, req); | |
897 | mutex_unlock(&ubi->mult_mutex); | |
898 | kfree(req); | |
899 | break; | |
900 | } | |
901 | ||
801c135c AB |
902 | default: |
903 | err = -ENOTTY; | |
904 | break; | |
905 | } | |
906 | ||
e73f4459 | 907 | ubi_put_device(ubi); |
801c135c AB |
908 | return err; |
909 | } | |
910 | ||
897a316c AB |
911 | static int ctrl_cdev_ioctl(struct inode *inode, struct file *file, |
912 | unsigned int cmd, unsigned long arg) | |
913 | { | |
914 | int err = 0; | |
915 | void __user *argp = (void __user *)arg; | |
916 | ||
917 | if (!capable(CAP_SYS_RESOURCE)) | |
918 | return -EPERM; | |
919 | ||
920 | switch (cmd) { | |
921 | /* Attach an MTD device command */ | |
922 | case UBI_IOCATT: | |
923 | { | |
924 | struct ubi_attach_req req; | |
925 | struct mtd_info *mtd; | |
926 | ||
c8566350 | 927 | dbg_gen("attach MTD device"); |
897a316c AB |
928 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
929 | if (err) { | |
930 | err = -EFAULT; | |
931 | break; | |
932 | } | |
933 | ||
934 | if (req.mtd_num < 0 || | |
935 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
936 | err = -EINVAL; | |
937 | break; | |
938 | } | |
939 | ||
940 | mtd = get_mtd_device(NULL, req.mtd_num); | |
941 | if (IS_ERR(mtd)) { | |
942 | err = PTR_ERR(mtd); | |
943 | break; | |
944 | } | |
945 | ||
946 | /* | |
947 | * Note, further request verification is done by | |
948 | * 'ubi_attach_mtd_dev()'. | |
949 | */ | |
950 | mutex_lock(&ubi_devices_mutex); | |
951 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset); | |
952 | mutex_unlock(&ubi_devices_mutex); | |
953 | if (err < 0) | |
954 | put_mtd_device(mtd); | |
955 | else | |
956 | /* @err contains UBI device number */ | |
957 | err = put_user(err, (__user int32_t *)argp); | |
958 | ||
959 | break; | |
960 | } | |
961 | ||
962 | /* Detach an MTD device command */ | |
963 | case UBI_IOCDET: | |
964 | { | |
965 | int ubi_num; | |
966 | ||
c8566350 | 967 | dbg_gen("dettach MTD device"); |
897a316c AB |
968 | err = get_user(ubi_num, (__user int32_t *)argp); |
969 | if (err) { | |
970 | err = -EFAULT; | |
971 | break; | |
972 | } | |
973 | ||
974 | mutex_lock(&ubi_devices_mutex); | |
975 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
976 | mutex_unlock(&ubi_devices_mutex); | |
977 | break; | |
978 | } | |
979 | ||
980 | default: | |
981 | err = -ENOTTY; | |
982 | break; | |
983 | } | |
984 | ||
985 | return err; | |
986 | } | |
987 | ||
9f961b57 AB |
988 | /* UBI control character device operations */ |
989 | struct file_operations ubi_ctrl_cdev_operations = { | |
897a316c | 990 | .ioctl = ctrl_cdev_ioctl, |
9f961b57 AB |
991 | .owner = THIS_MODULE, |
992 | }; | |
993 | ||
801c135c AB |
994 | /* UBI character device operations */ |
995 | struct file_operations ubi_cdev_operations = { | |
996 | .owner = THIS_MODULE, | |
997 | .ioctl = ubi_cdev_ioctl, | |
f800f09b | 998 | .llseek = no_llseek, |
801c135c AB |
999 | }; |
1000 | ||
1001 | /* UBI volume character device operations */ | |
1002 | struct file_operations ubi_vol_cdev_operations = { | |
1003 | .owner = THIS_MODULE, | |
1004 | .open = vol_cdev_open, | |
1005 | .release = vol_cdev_release, | |
1006 | .llseek = vol_cdev_llseek, | |
1007 | .read = vol_cdev_read, | |
1008 | .write = vol_cdev_write, | |
f800f09b | 1009 | .ioctl = vol_cdev_ioctl, |
801c135c | 1010 | }; |