Commit | Line | Data |
---|---|---|
801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | /* | |
22 | * This file includes implementation of UBI character device operations. | |
23 | * | |
24 | * There are two kinds of character devices in UBI: UBI character devices and | |
25 | * UBI volume character devices. UBI character devices allow users to | |
26 | * manipulate whole volumes: create, remove, and re-size them. Volume character | |
27 | * devices provide volume I/O capabilities. | |
28 | * | |
29 | * Major and minor numbers are assigned dynamically to both UBI and volume | |
30 | * character devices. | |
9f961b57 AB |
31 | * |
32 | * Well, there is the third kind of character devices - the UBI control | |
33 | * character device, which allows to manipulate by UBI devices - create and | |
34 | * delete them. In other words, it is used for attaching and detaching MTD | |
35 | * devices. | |
801c135c AB |
36 | */ |
37 | ||
38 | #include <linux/module.h> | |
39 | #include <linux/stat.h> | |
40 | #include <linux/ioctl.h> | |
41 | #include <linux/capability.h> | |
42 | #include <mtd/ubi-user.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/div64.h> | |
45 | #include "ubi.h" | |
46 | ||
801c135c AB |
47 | /** |
48 | * get_exclusive - get exclusive access to an UBI volume. | |
49 | * @desc: volume descriptor | |
50 | * | |
51 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
52 | * mode value (positive integer) in case of success and a negative error code | |
53 | * in case of failure. | |
54 | */ | |
55 | static int get_exclusive(struct ubi_volume_desc *desc) | |
56 | { | |
57 | int users, err; | |
58 | struct ubi_volume *vol = desc->vol; | |
59 | ||
60 | spin_lock(&vol->ubi->volumes_lock); | |
61 | users = vol->readers + vol->writers + vol->exclusive; | |
62 | ubi_assert(users > 0); | |
63 | if (users > 1) { | |
64 | dbg_err("%d users for volume %d", users, vol->vol_id); | |
65 | err = -EBUSY; | |
66 | } else { | |
67 | vol->readers = vol->writers = 0; | |
68 | vol->exclusive = 1; | |
69 | err = desc->mode; | |
70 | desc->mode = UBI_EXCLUSIVE; | |
71 | } | |
72 | spin_unlock(&vol->ubi->volumes_lock); | |
73 | ||
74 | return err; | |
75 | } | |
76 | ||
77 | /** | |
78 | * revoke_exclusive - revoke exclusive mode. | |
79 | * @desc: volume descriptor | |
80 | * @mode: new mode to switch to | |
81 | */ | |
82 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
83 | { | |
84 | struct ubi_volume *vol = desc->vol; | |
85 | ||
86 | spin_lock(&vol->ubi->volumes_lock); | |
87 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
88 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
89 | vol->exclusive = 0; | |
90 | if (mode == UBI_READONLY) | |
91 | vol->readers = 1; | |
92 | else if (mode == UBI_READWRITE) | |
93 | vol->writers = 1; | |
94 | else | |
95 | vol->exclusive = 1; | |
96 | spin_unlock(&vol->ubi->volumes_lock); | |
97 | ||
98 | desc->mode = mode; | |
99 | } | |
100 | ||
101 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
102 | { | |
103 | struct ubi_volume_desc *desc; | |
e73f4459 AB |
104 | int vol_id = iminor(inode) - 1, mode, ubi_num; |
105 | ||
106 | ubi_num = ubi_major2num(imajor(inode)); | |
107 | if (ubi_num < 0) | |
108 | return ubi_num; | |
801c135c AB |
109 | |
110 | if (file->f_mode & FMODE_WRITE) | |
111 | mode = UBI_READWRITE; | |
112 | else | |
113 | mode = UBI_READONLY; | |
114 | ||
115 | dbg_msg("open volume %d, mode %d", vol_id, mode); | |
116 | ||
e73f4459 | 117 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
801c135c AB |
118 | if (IS_ERR(desc)) |
119 | return PTR_ERR(desc); | |
120 | ||
121 | file->private_data = desc; | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
126 | { | |
127 | struct ubi_volume_desc *desc = file->private_data; | |
128 | struct ubi_volume *vol = desc->vol; | |
129 | ||
130 | dbg_msg("release volume %d, mode %d", vol->vol_id, desc->mode); | |
131 | ||
132 | if (vol->updating) { | |
133 | ubi_warn("update of volume %d not finished, volume is damaged", | |
134 | vol->vol_id); | |
135 | vol->updating = 0; | |
92ad8f37 | 136 | vfree(vol->upd_buf); |
801c135c AB |
137 | } |
138 | ||
139 | ubi_close_volume(desc); | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
144 | { | |
145 | struct ubi_volume_desc *desc = file->private_data; | |
146 | struct ubi_volume *vol = desc->vol; | |
147 | loff_t new_offset; | |
148 | ||
149 | if (vol->updating) { | |
150 | /* Update is in progress, seeking is prohibited */ | |
151 | dbg_err("updating"); | |
152 | return -EBUSY; | |
153 | } | |
154 | ||
155 | switch (origin) { | |
156 | case 0: /* SEEK_SET */ | |
157 | new_offset = offset; | |
158 | break; | |
159 | case 1: /* SEEK_CUR */ | |
160 | new_offset = file->f_pos + offset; | |
161 | break; | |
162 | case 2: /* SEEK_END */ | |
163 | new_offset = vol->used_bytes + offset; | |
164 | break; | |
165 | default: | |
166 | return -EINVAL; | |
167 | } | |
168 | ||
169 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
170 | dbg_err("bad seek %lld", new_offset); | |
171 | return -EINVAL; | |
172 | } | |
173 | ||
174 | dbg_msg("seek volume %d, offset %lld, origin %d, new offset %lld", | |
175 | vol->vol_id, offset, origin, new_offset); | |
176 | ||
177 | file->f_pos = new_offset; | |
178 | return new_offset; | |
179 | } | |
180 | ||
181 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, | |
182 | loff_t *offp) | |
183 | { | |
184 | struct ubi_volume_desc *desc = file->private_data; | |
185 | struct ubi_volume *vol = desc->vol; | |
186 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 187 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
188 | size_t count_save = count; |
189 | void *tbuf; | |
190 | uint64_t tmp; | |
191 | ||
192 | dbg_msg("read %zd bytes from offset %lld of volume %d", | |
ae616e1b | 193 | count, *offp, vol->vol_id); |
801c135c AB |
194 | |
195 | if (vol->updating) { | |
196 | dbg_err("updating"); | |
197 | return -EBUSY; | |
198 | } | |
199 | if (vol->upd_marker) { | |
200 | dbg_err("damaged volume, update marker is set"); | |
201 | return -EBADF; | |
202 | } | |
203 | if (*offp == vol->used_bytes || count == 0) | |
204 | return 0; | |
205 | ||
206 | if (vol->corrupted) | |
ae616e1b | 207 | dbg_msg("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
208 | |
209 | if (*offp + count > vol->used_bytes) | |
210 | count_save = count = vol->used_bytes - *offp; | |
211 | ||
212 | tbuf_size = vol->usable_leb_size; | |
213 | if (count < tbuf_size) | |
214 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 215 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
216 | if (!tbuf) |
217 | return -ENOMEM; | |
218 | ||
219 | len = count > tbuf_size ? tbuf_size : count; | |
220 | ||
221 | tmp = *offp; | |
222 | off = do_div(tmp, vol->usable_leb_size); | |
223 | lnum = tmp; | |
224 | ||
225 | do { | |
226 | cond_resched(); | |
227 | ||
228 | if (off + len >= vol->usable_leb_size) | |
229 | len = vol->usable_leb_size - off; | |
230 | ||
89b96b69 | 231 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
232 | if (err) |
233 | break; | |
234 | ||
235 | off += len; | |
236 | if (off == vol->usable_leb_size) { | |
237 | lnum += 1; | |
238 | off -= vol->usable_leb_size; | |
239 | } | |
240 | ||
241 | count -= len; | |
242 | *offp += len; | |
243 | ||
244 | err = copy_to_user(buf, tbuf, len); | |
245 | if (err) { | |
246 | err = -EFAULT; | |
247 | break; | |
248 | } | |
249 | ||
250 | buf += len; | |
251 | len = count > tbuf_size ? tbuf_size : count; | |
252 | } while (count); | |
253 | ||
92ad8f37 | 254 | vfree(tbuf); |
801c135c AB |
255 | return err ? err : count_save - count; |
256 | } | |
257 | ||
258 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
259 | ||
260 | /* | |
261 | * This function allows to directly write to dynamic UBI volumes, without | |
262 | * issuing the volume update operation. Available only as a debugging feature. | |
263 | * Very useful for testing UBI. | |
264 | */ | |
265 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
266 | size_t count, loff_t *offp) | |
267 | { | |
268 | struct ubi_volume_desc *desc = file->private_data; | |
269 | struct ubi_volume *vol = desc->vol; | |
270 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 271 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
272 | size_t count_save = count; |
273 | char *tbuf; | |
274 | uint64_t tmp; | |
275 | ||
276 | dbg_msg("requested: write %zd bytes to offset %lld of volume %u", | |
ae616e1b | 277 | count, *offp, vol->vol_id); |
801c135c AB |
278 | |
279 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
280 | return -EROFS; | |
281 | ||
282 | tmp = *offp; | |
283 | off = do_div(tmp, vol->usable_leb_size); | |
284 | lnum = tmp; | |
285 | ||
286 | if (off % ubi->min_io_size) { | |
287 | dbg_err("unaligned position"); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
291 | if (*offp + count > vol->used_bytes) | |
292 | count_save = count = vol->used_bytes - *offp; | |
293 | ||
294 | /* We can write only in fractions of the minimum I/O unit */ | |
295 | if (count % ubi->min_io_size) { | |
296 | dbg_err("unaligned write length"); | |
297 | return -EINVAL; | |
298 | } | |
299 | ||
300 | tbuf_size = vol->usable_leb_size; | |
301 | if (count < tbuf_size) | |
302 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 303 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
304 | if (!tbuf) |
305 | return -ENOMEM; | |
306 | ||
307 | len = count > tbuf_size ? tbuf_size : count; | |
308 | ||
309 | while (count) { | |
310 | cond_resched(); | |
311 | ||
312 | if (off + len >= vol->usable_leb_size) | |
313 | len = vol->usable_leb_size - off; | |
314 | ||
315 | err = copy_from_user(tbuf, buf, len); | |
316 | if (err) { | |
317 | err = -EFAULT; | |
318 | break; | |
319 | } | |
320 | ||
89b96b69 | 321 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len, |
801c135c AB |
322 | UBI_UNKNOWN); |
323 | if (err) | |
324 | break; | |
325 | ||
326 | off += len; | |
327 | if (off == vol->usable_leb_size) { | |
328 | lnum += 1; | |
329 | off -= vol->usable_leb_size; | |
330 | } | |
331 | ||
332 | count -= len; | |
333 | *offp += len; | |
334 | buf += len; | |
335 | len = count > tbuf_size ? tbuf_size : count; | |
336 | } | |
337 | ||
92ad8f37 | 338 | vfree(tbuf); |
801c135c AB |
339 | return err ? err : count_save - count; |
340 | } | |
341 | ||
342 | #else | |
343 | #define vol_cdev_direct_write(file, buf, count, offp) -EPERM | |
344 | #endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */ | |
345 | ||
346 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, | |
347 | size_t count, loff_t *offp) | |
348 | { | |
349 | int err = 0; | |
350 | struct ubi_volume_desc *desc = file->private_data; | |
351 | struct ubi_volume *vol = desc->vol; | |
352 | struct ubi_device *ubi = vol->ubi; | |
353 | ||
354 | if (!vol->updating) | |
355 | return vol_cdev_direct_write(file, buf, count, offp); | |
356 | ||
357 | err = ubi_more_update_data(ubi, vol->vol_id, buf, count); | |
358 | if (err < 0) { | |
01f7b309 AB |
359 | ubi_err("cannot write %zd bytes of update data, error %d", |
360 | count, err); | |
801c135c AB |
361 | return err; |
362 | } | |
363 | ||
364 | if (err) { | |
365 | /* | |
366 | * Update is finished, @err contains number of actually written | |
367 | * bytes now. | |
368 | */ | |
369 | count = err; | |
370 | ||
0411e735 | 371 | vol->updating = 0; |
801c135c AB |
372 | err = ubi_check_volume(ubi, vol->vol_id); |
373 | if (err < 0) | |
374 | return err; | |
375 | ||
376 | if (err) { | |
377 | ubi_warn("volume %d on UBI device %d is corrupted", | |
378 | vol->vol_id, ubi->ubi_num); | |
379 | vol->corrupted = 1; | |
380 | } | |
381 | vol->checked = 1; | |
941dfb07 | 382 | ubi_gluebi_updated(vol); |
801c135c AB |
383 | revoke_exclusive(desc, UBI_READWRITE); |
384 | } | |
385 | ||
801c135c AB |
386 | return count; |
387 | } | |
388 | ||
389 | static int vol_cdev_ioctl(struct inode *inode, struct file *file, | |
390 | unsigned int cmd, unsigned long arg) | |
391 | { | |
392 | int err = 0; | |
393 | struct ubi_volume_desc *desc = file->private_data; | |
394 | struct ubi_volume *vol = desc->vol; | |
395 | struct ubi_device *ubi = vol->ubi; | |
396 | void __user *argp = (void __user *)arg; | |
397 | ||
801c135c | 398 | switch (cmd) { |
801c135c AB |
399 | /* Volume update command */ |
400 | case UBI_IOCVOLUP: | |
401 | { | |
402 | int64_t bytes, rsvd_bytes; | |
403 | ||
404 | if (!capable(CAP_SYS_RESOURCE)) { | |
405 | err = -EPERM; | |
406 | break; | |
407 | } | |
408 | ||
409 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
410 | if (err) { | |
411 | err = -EFAULT; | |
412 | break; | |
413 | } | |
414 | ||
415 | if (desc->mode == UBI_READONLY) { | |
416 | err = -EROFS; | |
417 | break; | |
418 | } | |
419 | ||
420 | rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad); | |
421 | if (bytes < 0 || bytes > rsvd_bytes) { | |
422 | err = -EINVAL; | |
423 | break; | |
424 | } | |
425 | ||
426 | err = get_exclusive(desc); | |
427 | if (err < 0) | |
428 | break; | |
429 | ||
430 | err = ubi_start_update(ubi, vol->vol_id, bytes); | |
431 | if (bytes == 0) | |
432 | revoke_exclusive(desc, UBI_READWRITE); | |
801c135c AB |
433 | break; |
434 | } | |
435 | ||
436 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
437 | /* Logical eraseblock erasure command */ | |
438 | case UBI_IOCEBER: | |
439 | { | |
440 | int32_t lnum; | |
441 | ||
bf07803a | 442 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
443 | if (err) { |
444 | err = -EFAULT; | |
445 | break; | |
446 | } | |
447 | ||
448 | if (desc->mode == UBI_READONLY) { | |
449 | err = -EROFS; | |
450 | break; | |
451 | } | |
452 | ||
453 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
454 | err = -EINVAL; | |
455 | break; | |
456 | } | |
457 | ||
458 | if (vol->vol_type != UBI_DYNAMIC_VOLUME) { | |
459 | err = -EROFS; | |
460 | break; | |
461 | } | |
462 | ||
463 | dbg_msg("erase LEB %d:%d", vol->vol_id, lnum); | |
89b96b69 | 464 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
465 | if (err) |
466 | break; | |
467 | ||
468 | err = ubi_wl_flush(ubi); | |
469 | break; | |
470 | } | |
471 | #endif | |
472 | ||
473 | default: | |
474 | err = -ENOTTY; | |
475 | break; | |
476 | } | |
477 | ||
478 | return err; | |
479 | } | |
480 | ||
481 | /** | |
482 | * verify_mkvol_req - verify volume creation request. | |
483 | * @ubi: UBI device description object | |
484 | * @req: the request to check | |
485 | * | |
486 | * This function zero if the request is correct, and %-EINVAL if not. | |
487 | */ | |
488 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
489 | const struct ubi_mkvol_req *req) | |
490 | { | |
491 | int n, err = -EINVAL; | |
492 | ||
493 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
494 | req->name_len < 0) | |
495 | goto bad; | |
496 | ||
497 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
498 | req->vol_id != UBI_VOL_NUM_AUTO) | |
499 | goto bad; | |
500 | ||
501 | if (req->alignment == 0) | |
502 | goto bad; | |
503 | ||
504 | if (req->bytes == 0) | |
505 | goto bad; | |
506 | ||
507 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
508 | req->vol_type != UBI_STATIC_VOLUME) | |
509 | goto bad; | |
510 | ||
511 | if (req->alignment > ubi->leb_size) | |
512 | goto bad; | |
513 | ||
514 | n = req->alignment % ubi->min_io_size; | |
515 | if (req->alignment != 1 && n) | |
516 | goto bad; | |
517 | ||
518 | if (req->name_len > UBI_VOL_NAME_MAX) { | |
519 | err = -ENAMETOOLONG; | |
520 | goto bad; | |
521 | } | |
522 | ||
523 | return 0; | |
524 | ||
525 | bad: | |
526 | dbg_err("bad volume creation request"); | |
527 | ubi_dbg_dump_mkvol_req(req); | |
528 | return err; | |
529 | } | |
530 | ||
531 | /** | |
532 | * verify_rsvol_req - verify volume re-size request. | |
533 | * @ubi: UBI device description object | |
534 | * @req: the request to check | |
535 | * | |
536 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
537 | */ | |
538 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
539 | const struct ubi_rsvol_req *req) | |
540 | { | |
541 | if (req->bytes <= 0) | |
542 | return -EINVAL; | |
543 | ||
544 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
545 | return -EINVAL; | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | static int ubi_cdev_ioctl(struct inode *inode, struct file *file, | |
551 | unsigned int cmd, unsigned long arg) | |
552 | { | |
553 | int err = 0; | |
554 | struct ubi_device *ubi; | |
555 | struct ubi_volume_desc *desc; | |
556 | void __user *argp = (void __user *)arg; | |
557 | ||
801c135c AB |
558 | if (!capable(CAP_SYS_RESOURCE)) |
559 | return -EPERM; | |
560 | ||
e73f4459 AB |
561 | ubi = ubi_get_by_major(imajor(inode)); |
562 | if (!ubi) | |
563 | return -ENODEV; | |
801c135c AB |
564 | |
565 | switch (cmd) { | |
566 | /* Create volume command */ | |
567 | case UBI_IOCMKVOL: | |
568 | { | |
569 | struct ubi_mkvol_req req; | |
570 | ||
571 | dbg_msg("create volume"); | |
897a316c | 572 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
573 | if (err) { |
574 | err = -EFAULT; | |
575 | break; | |
576 | } | |
577 | ||
578 | err = verify_mkvol_req(ubi, &req); | |
579 | if (err) | |
580 | break; | |
581 | ||
582 | req.name[req.name_len] = '\0'; | |
583 | ||
40e4d0c1 | 584 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 585 | err = ubi_create_volume(ubi, &req); |
40e4d0c1 | 586 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
587 | if (err) |
588 | break; | |
589 | ||
bf07803a | 590 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
591 | if (err) |
592 | err = -EFAULT; | |
593 | ||
594 | break; | |
595 | } | |
596 | ||
597 | /* Remove volume command */ | |
598 | case UBI_IOCRMVOL: | |
599 | { | |
600 | int vol_id; | |
601 | ||
602 | dbg_msg("remove volume"); | |
bf07803a | 603 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
604 | if (err) { |
605 | err = -EFAULT; | |
606 | break; | |
607 | } | |
608 | ||
609 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
610 | if (IS_ERR(desc)) { | |
611 | err = PTR_ERR(desc); | |
612 | break; | |
613 | } | |
614 | ||
40e4d0c1 | 615 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 616 | err = ubi_remove_volume(desc); |
40e4d0c1 AB |
617 | mutex_unlock(&ubi->volumes_mutex); |
618 | ||
450f872a | 619 | /* |
40e4d0c1 AB |
620 | * The volume is deleted (unless an error occurred), and the |
621 | * 'struct ubi_volume' object will be freed when | |
622 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
623 | */ |
624 | ubi_close_volume(desc); | |
801c135c AB |
625 | break; |
626 | } | |
627 | ||
628 | /* Re-size volume command */ | |
629 | case UBI_IOCRSVOL: | |
630 | { | |
631 | int pebs; | |
632 | uint64_t tmp; | |
633 | struct ubi_rsvol_req req; | |
634 | ||
635 | dbg_msg("re-size volume"); | |
897a316c | 636 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
637 | if (err) { |
638 | err = -EFAULT; | |
639 | break; | |
640 | } | |
641 | ||
642 | err = verify_rsvol_req(ubi, &req); | |
643 | if (err) | |
644 | break; | |
645 | ||
646 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
647 | if (IS_ERR(desc)) { | |
648 | err = PTR_ERR(desc); | |
649 | break; | |
650 | } | |
651 | ||
652 | tmp = req.bytes; | |
653 | pebs = !!do_div(tmp, desc->vol->usable_leb_size); | |
654 | pebs += tmp; | |
655 | ||
40e4d0c1 | 656 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 657 | err = ubi_resize_volume(desc, pebs); |
40e4d0c1 | 658 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
659 | ubi_close_volume(desc); |
660 | break; | |
661 | } | |
662 | ||
663 | default: | |
664 | err = -ENOTTY; | |
665 | break; | |
666 | } | |
667 | ||
e73f4459 | 668 | ubi_put_device(ubi); |
801c135c AB |
669 | return err; |
670 | } | |
671 | ||
897a316c AB |
672 | static int ctrl_cdev_ioctl(struct inode *inode, struct file *file, |
673 | unsigned int cmd, unsigned long arg) | |
674 | { | |
675 | int err = 0; | |
676 | void __user *argp = (void __user *)arg; | |
677 | ||
678 | if (!capable(CAP_SYS_RESOURCE)) | |
679 | return -EPERM; | |
680 | ||
681 | switch (cmd) { | |
682 | /* Attach an MTD device command */ | |
683 | case UBI_IOCATT: | |
684 | { | |
685 | struct ubi_attach_req req; | |
686 | struct mtd_info *mtd; | |
687 | ||
688 | dbg_msg("attach MTD device"); | |
689 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); | |
690 | if (err) { | |
691 | err = -EFAULT; | |
692 | break; | |
693 | } | |
694 | ||
695 | if (req.mtd_num < 0 || | |
696 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
697 | err = -EINVAL; | |
698 | break; | |
699 | } | |
700 | ||
701 | mtd = get_mtd_device(NULL, req.mtd_num); | |
702 | if (IS_ERR(mtd)) { | |
703 | err = PTR_ERR(mtd); | |
704 | break; | |
705 | } | |
706 | ||
707 | /* | |
708 | * Note, further request verification is done by | |
709 | * 'ubi_attach_mtd_dev()'. | |
710 | */ | |
711 | mutex_lock(&ubi_devices_mutex); | |
712 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset); | |
713 | mutex_unlock(&ubi_devices_mutex); | |
714 | if (err < 0) | |
715 | put_mtd_device(mtd); | |
716 | else | |
717 | /* @err contains UBI device number */ | |
718 | err = put_user(err, (__user int32_t *)argp); | |
719 | ||
720 | break; | |
721 | } | |
722 | ||
723 | /* Detach an MTD device command */ | |
724 | case UBI_IOCDET: | |
725 | { | |
726 | int ubi_num; | |
727 | ||
728 | dbg_msg("dettach MTD device"); | |
729 | err = get_user(ubi_num, (__user int32_t *)argp); | |
730 | if (err) { | |
731 | err = -EFAULT; | |
732 | break; | |
733 | } | |
734 | ||
735 | mutex_lock(&ubi_devices_mutex); | |
736 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
737 | mutex_unlock(&ubi_devices_mutex); | |
738 | break; | |
739 | } | |
740 | ||
741 | default: | |
742 | err = -ENOTTY; | |
743 | break; | |
744 | } | |
745 | ||
746 | return err; | |
747 | } | |
748 | ||
9f961b57 AB |
749 | /* UBI control character device operations */ |
750 | struct file_operations ubi_ctrl_cdev_operations = { | |
897a316c | 751 | .ioctl = ctrl_cdev_ioctl, |
9f961b57 AB |
752 | .owner = THIS_MODULE, |
753 | }; | |
754 | ||
801c135c AB |
755 | /* UBI character device operations */ |
756 | struct file_operations ubi_cdev_operations = { | |
757 | .owner = THIS_MODULE, | |
758 | .ioctl = ubi_cdev_ioctl, | |
f800f09b | 759 | .llseek = no_llseek, |
801c135c AB |
760 | }; |
761 | ||
762 | /* UBI volume character device operations */ | |
763 | struct file_operations ubi_vol_cdev_operations = { | |
764 | .owner = THIS_MODULE, | |
765 | .open = vol_cdev_open, | |
766 | .release = vol_cdev_release, | |
767 | .llseek = vol_cdev_llseek, | |
768 | .read = vol_cdev_read, | |
769 | .write = vol_cdev_write, | |
f800f09b | 770 | .ioctl = vol_cdev_ioctl, |
801c135c | 771 | }; |