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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. | |
31 | */ | |
32 | ||
33 | #include <linux/module.h> | |
34 | #include <linux/stat.h> | |
35 | #include <linux/ioctl.h> | |
36 | #include <linux/capability.h> | |
37 | #include <mtd/ubi-user.h> | |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/div64.h> | |
40 | #include "ubi.h" | |
41 | ||
42 | /* | |
43 | * Maximum sequence numbers of UBI and volume character device IOCTLs (direct | |
44 | * logical eraseblock erase is a debug-only feature). | |
45 | */ | |
46 | #define UBI_CDEV_IOC_MAX_SEQ 2 | |
47 | #ifndef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
48 | #define VOL_CDEV_IOC_MAX_SEQ 1 | |
49 | #else | |
50 | #define VOL_CDEV_IOC_MAX_SEQ 2 | |
51 | #endif | |
52 | ||
53 | /** | |
54 | * major_to_device - get UBI device object by character device major number. | |
55 | * @major: major number | |
56 | * | |
57 | * This function returns a pointer to the UBI device object. | |
58 | */ | |
59 | static struct ubi_device *major_to_device(int major) | |
60 | { | |
61 | int i; | |
62 | ||
63 | for (i = 0; i < ubi_devices_cnt; i++) | |
64 | if (ubi_devices[i] && ubi_devices[i]->major == major) | |
65 | return ubi_devices[i]; | |
66 | BUG(); | |
67 | } | |
68 | ||
69 | /** | |
70 | * get_exclusive - get exclusive access to an UBI volume. | |
71 | * @desc: volume descriptor | |
72 | * | |
73 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
74 | * mode value (positive integer) in case of success and a negative error code | |
75 | * in case of failure. | |
76 | */ | |
77 | static int get_exclusive(struct ubi_volume_desc *desc) | |
78 | { | |
79 | int users, err; | |
80 | struct ubi_volume *vol = desc->vol; | |
81 | ||
82 | spin_lock(&vol->ubi->volumes_lock); | |
83 | users = vol->readers + vol->writers + vol->exclusive; | |
84 | ubi_assert(users > 0); | |
85 | if (users > 1) { | |
86 | dbg_err("%d users for volume %d", users, vol->vol_id); | |
87 | err = -EBUSY; | |
88 | } else { | |
89 | vol->readers = vol->writers = 0; | |
90 | vol->exclusive = 1; | |
91 | err = desc->mode; | |
92 | desc->mode = UBI_EXCLUSIVE; | |
93 | } | |
94 | spin_unlock(&vol->ubi->volumes_lock); | |
95 | ||
96 | return err; | |
97 | } | |
98 | ||
99 | /** | |
100 | * revoke_exclusive - revoke exclusive mode. | |
101 | * @desc: volume descriptor | |
102 | * @mode: new mode to switch to | |
103 | */ | |
104 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
105 | { | |
106 | struct ubi_volume *vol = desc->vol; | |
107 | ||
108 | spin_lock(&vol->ubi->volumes_lock); | |
109 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
110 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
111 | vol->exclusive = 0; | |
112 | if (mode == UBI_READONLY) | |
113 | vol->readers = 1; | |
114 | else if (mode == UBI_READWRITE) | |
115 | vol->writers = 1; | |
116 | else | |
117 | vol->exclusive = 1; | |
118 | spin_unlock(&vol->ubi->volumes_lock); | |
119 | ||
120 | desc->mode = mode; | |
121 | } | |
122 | ||
123 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
124 | { | |
125 | struct ubi_volume_desc *desc; | |
126 | const struct ubi_device *ubi = major_to_device(imajor(inode)); | |
127 | int vol_id = iminor(inode) - 1; | |
128 | int mode; | |
129 | ||
130 | if (file->f_mode & FMODE_WRITE) | |
131 | mode = UBI_READWRITE; | |
132 | else | |
133 | mode = UBI_READONLY; | |
134 | ||
135 | dbg_msg("open volume %d, mode %d", vol_id, mode); | |
136 | ||
137 | desc = ubi_open_volume(ubi->ubi_num, vol_id, mode); | |
138 | if (IS_ERR(desc)) | |
139 | return PTR_ERR(desc); | |
140 | ||
141 | file->private_data = desc; | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
146 | { | |
147 | struct ubi_volume_desc *desc = file->private_data; | |
148 | struct ubi_volume *vol = desc->vol; | |
149 | ||
150 | dbg_msg("release volume %d, mode %d", vol->vol_id, desc->mode); | |
151 | ||
152 | if (vol->updating) { | |
153 | ubi_warn("update of volume %d not finished, volume is damaged", | |
154 | vol->vol_id); | |
155 | vol->updating = 0; | |
156 | kfree(vol->upd_buf); | |
157 | } | |
158 | ||
159 | ubi_close_volume(desc); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
164 | { | |
165 | struct ubi_volume_desc *desc = file->private_data; | |
166 | struct ubi_volume *vol = desc->vol; | |
167 | loff_t new_offset; | |
168 | ||
169 | if (vol->updating) { | |
170 | /* Update is in progress, seeking is prohibited */ | |
171 | dbg_err("updating"); | |
172 | return -EBUSY; | |
173 | } | |
174 | ||
175 | switch (origin) { | |
176 | case 0: /* SEEK_SET */ | |
177 | new_offset = offset; | |
178 | break; | |
179 | case 1: /* SEEK_CUR */ | |
180 | new_offset = file->f_pos + offset; | |
181 | break; | |
182 | case 2: /* SEEK_END */ | |
183 | new_offset = vol->used_bytes + offset; | |
184 | break; | |
185 | default: | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
189 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
190 | dbg_err("bad seek %lld", new_offset); | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | dbg_msg("seek volume %d, offset %lld, origin %d, new offset %lld", | |
195 | vol->vol_id, offset, origin, new_offset); | |
196 | ||
197 | file->f_pos = new_offset; | |
198 | return new_offset; | |
199 | } | |
200 | ||
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; | |
207 | int err, lnum, off, len, vol_id = desc->vol->vol_id, tbuf_size; | |
208 | size_t count_save = count; | |
209 | void *tbuf; | |
210 | uint64_t tmp; | |
211 | ||
212 | dbg_msg("read %zd bytes from offset %lld of volume %d", | |
213 | count, *offp, vol_id); | |
214 | ||
215 | if (vol->updating) { | |
216 | dbg_err("updating"); | |
217 | return -EBUSY; | |
218 | } | |
219 | if (vol->upd_marker) { | |
220 | dbg_err("damaged volume, update marker is set"); | |
221 | return -EBADF; | |
222 | } | |
223 | if (*offp == vol->used_bytes || count == 0) | |
224 | return 0; | |
225 | ||
226 | if (vol->corrupted) | |
227 | dbg_msg("read from corrupted volume %d", vol_id); | |
228 | ||
229 | if (*offp + count > vol->used_bytes) | |
230 | count_save = count = vol->used_bytes - *offp; | |
231 | ||
232 | tbuf_size = vol->usable_leb_size; | |
233 | if (count < tbuf_size) | |
234 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
235 | tbuf = kmalloc(tbuf_size, GFP_KERNEL); | |
236 | if (!tbuf) | |
237 | return -ENOMEM; | |
238 | ||
239 | len = count > tbuf_size ? tbuf_size : count; | |
240 | ||
241 | tmp = *offp; | |
242 | off = do_div(tmp, vol->usable_leb_size); | |
243 | lnum = tmp; | |
244 | ||
245 | do { | |
246 | cond_resched(); | |
247 | ||
248 | if (off + len >= vol->usable_leb_size) | |
249 | len = vol->usable_leb_size - off; | |
250 | ||
251 | err = ubi_eba_read_leb(ubi, vol_id, lnum, tbuf, off, len, 0); | |
252 | if (err) | |
253 | break; | |
254 | ||
255 | off += len; | |
256 | if (off == vol->usable_leb_size) { | |
257 | lnum += 1; | |
258 | off -= vol->usable_leb_size; | |
259 | } | |
260 | ||
261 | count -= len; | |
262 | *offp += len; | |
263 | ||
264 | err = copy_to_user(buf, tbuf, len); | |
265 | if (err) { | |
266 | err = -EFAULT; | |
267 | break; | |
268 | } | |
269 | ||
270 | buf += len; | |
271 | len = count > tbuf_size ? tbuf_size : count; | |
272 | } while (count); | |
273 | ||
274 | kfree(tbuf); | |
275 | return err ? err : count_save - count; | |
276 | } | |
277 | ||
278 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
279 | ||
280 | /* | |
281 | * This function allows to directly write to dynamic UBI volumes, without | |
282 | * issuing the volume update operation. Available only as a debugging feature. | |
283 | * Very useful for testing UBI. | |
284 | */ | |
285 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
286 | size_t count, loff_t *offp) | |
287 | { | |
288 | struct ubi_volume_desc *desc = file->private_data; | |
289 | struct ubi_volume *vol = desc->vol; | |
290 | struct ubi_device *ubi = vol->ubi; | |
291 | int lnum, off, len, tbuf_size, vol_id = vol->vol_id, err = 0; | |
292 | size_t count_save = count; | |
293 | char *tbuf; | |
294 | uint64_t tmp; | |
295 | ||
296 | dbg_msg("requested: write %zd bytes to offset %lld of volume %u", | |
297 | count, *offp, desc->vol->vol_id); | |
298 | ||
299 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
300 | return -EROFS; | |
301 | ||
302 | tmp = *offp; | |
303 | off = do_div(tmp, vol->usable_leb_size); | |
304 | lnum = tmp; | |
305 | ||
306 | if (off % ubi->min_io_size) { | |
307 | dbg_err("unaligned position"); | |
308 | return -EINVAL; | |
309 | } | |
310 | ||
311 | if (*offp + count > vol->used_bytes) | |
312 | count_save = count = vol->used_bytes - *offp; | |
313 | ||
314 | /* We can write only in fractions of the minimum I/O unit */ | |
315 | if (count % ubi->min_io_size) { | |
316 | dbg_err("unaligned write length"); | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | tbuf_size = vol->usable_leb_size; | |
321 | if (count < tbuf_size) | |
322 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
323 | tbuf = kmalloc(tbuf_size, GFP_KERNEL); | |
324 | if (!tbuf) | |
325 | return -ENOMEM; | |
326 | ||
327 | len = count > tbuf_size ? tbuf_size : count; | |
328 | ||
329 | while (count) { | |
330 | cond_resched(); | |
331 | ||
332 | if (off + len >= vol->usable_leb_size) | |
333 | len = vol->usable_leb_size - off; | |
334 | ||
335 | err = copy_from_user(tbuf, buf, len); | |
336 | if (err) { | |
337 | err = -EFAULT; | |
338 | break; | |
339 | } | |
340 | ||
341 | err = ubi_eba_write_leb(ubi, vol_id, lnum, tbuf, off, len, | |
342 | UBI_UNKNOWN); | |
343 | if (err) | |
344 | break; | |
345 | ||
346 | off += len; | |
347 | if (off == vol->usable_leb_size) { | |
348 | lnum += 1; | |
349 | off -= vol->usable_leb_size; | |
350 | } | |
351 | ||
352 | count -= len; | |
353 | *offp += len; | |
354 | buf += len; | |
355 | len = count > tbuf_size ? tbuf_size : count; | |
356 | } | |
357 | ||
358 | kfree(tbuf); | |
359 | return err ? err : count_save - count; | |
360 | } | |
361 | ||
362 | #else | |
363 | #define vol_cdev_direct_write(file, buf, count, offp) -EPERM | |
364 | #endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */ | |
365 | ||
366 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, | |
367 | size_t count, loff_t *offp) | |
368 | { | |
369 | int err = 0; | |
370 | struct ubi_volume_desc *desc = file->private_data; | |
371 | struct ubi_volume *vol = desc->vol; | |
372 | struct ubi_device *ubi = vol->ubi; | |
373 | ||
374 | if (!vol->updating) | |
375 | return vol_cdev_direct_write(file, buf, count, offp); | |
376 | ||
377 | err = ubi_more_update_data(ubi, vol->vol_id, buf, count); | |
378 | if (err < 0) { | |
379 | ubi_err("cannot write %zd bytes of update data", count); | |
380 | return err; | |
381 | } | |
382 | ||
383 | if (err) { | |
384 | /* | |
385 | * Update is finished, @err contains number of actually written | |
386 | * bytes now. | |
387 | */ | |
388 | count = err; | |
389 | ||
390 | err = ubi_check_volume(ubi, vol->vol_id); | |
391 | if (err < 0) | |
392 | return err; | |
393 | ||
394 | if (err) { | |
395 | ubi_warn("volume %d on UBI device %d is corrupted", | |
396 | vol->vol_id, ubi->ubi_num); | |
397 | vol->corrupted = 1; | |
398 | } | |
399 | vol->checked = 1; | |
400 | revoke_exclusive(desc, UBI_READWRITE); | |
401 | } | |
402 | ||
403 | *offp += count; | |
404 | return count; | |
405 | } | |
406 | ||
407 | static int vol_cdev_ioctl(struct inode *inode, struct file *file, | |
408 | unsigned int cmd, unsigned long arg) | |
409 | { | |
410 | int err = 0; | |
411 | struct ubi_volume_desc *desc = file->private_data; | |
412 | struct ubi_volume *vol = desc->vol; | |
413 | struct ubi_device *ubi = vol->ubi; | |
414 | void __user *argp = (void __user *)arg; | |
415 | ||
416 | if (_IOC_NR(cmd) > VOL_CDEV_IOC_MAX_SEQ || | |
417 | _IOC_TYPE(cmd) != UBI_VOL_IOC_MAGIC) | |
418 | return -ENOTTY; | |
419 | ||
420 | if (_IOC_DIR(cmd) && _IOC_READ) | |
421 | err = !access_ok(VERIFY_WRITE, argp, _IOC_SIZE(cmd)); | |
422 | else if (_IOC_DIR(cmd) && _IOC_WRITE) | |
423 | err = !access_ok(VERIFY_READ, argp, _IOC_SIZE(cmd)); | |
424 | if (err) | |
425 | return -EFAULT; | |
426 | ||
427 | switch (cmd) { | |
428 | ||
429 | /* Volume update command */ | |
430 | case UBI_IOCVOLUP: | |
431 | { | |
432 | int64_t bytes, rsvd_bytes; | |
433 | ||
434 | if (!capable(CAP_SYS_RESOURCE)) { | |
435 | err = -EPERM; | |
436 | break; | |
437 | } | |
438 | ||
439 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
440 | if (err) { | |
441 | err = -EFAULT; | |
442 | break; | |
443 | } | |
444 | ||
445 | if (desc->mode == UBI_READONLY) { | |
446 | err = -EROFS; | |
447 | break; | |
448 | } | |
449 | ||
450 | rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad); | |
451 | if (bytes < 0 || bytes > rsvd_bytes) { | |
452 | err = -EINVAL; | |
453 | break; | |
454 | } | |
455 | ||
456 | err = get_exclusive(desc); | |
457 | if (err < 0) | |
458 | break; | |
459 | ||
460 | err = ubi_start_update(ubi, vol->vol_id, bytes); | |
461 | if (bytes == 0) | |
462 | revoke_exclusive(desc, UBI_READWRITE); | |
463 | ||
464 | file->f_pos = 0; | |
465 | break; | |
466 | } | |
467 | ||
468 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
469 | /* Logical eraseblock erasure command */ | |
470 | case UBI_IOCEBER: | |
471 | { | |
472 | int32_t lnum; | |
473 | ||
474 | err = __get_user(lnum, (__user int32_t *)argp); | |
475 | if (err) { | |
476 | err = -EFAULT; | |
477 | break; | |
478 | } | |
479 | ||
480 | if (desc->mode == UBI_READONLY) { | |
481 | err = -EROFS; | |
482 | break; | |
483 | } | |
484 | ||
485 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
486 | err = -EINVAL; | |
487 | break; | |
488 | } | |
489 | ||
490 | if (vol->vol_type != UBI_DYNAMIC_VOLUME) { | |
491 | err = -EROFS; | |
492 | break; | |
493 | } | |
494 | ||
495 | dbg_msg("erase LEB %d:%d", vol->vol_id, lnum); | |
496 | err = ubi_eba_unmap_leb(ubi, vol->vol_id, lnum); | |
497 | if (err) | |
498 | break; | |
499 | ||
500 | err = ubi_wl_flush(ubi); | |
501 | break; | |
502 | } | |
503 | #endif | |
504 | ||
505 | default: | |
506 | err = -ENOTTY; | |
507 | break; | |
508 | } | |
509 | ||
510 | return err; | |
511 | } | |
512 | ||
513 | /** | |
514 | * verify_mkvol_req - verify volume creation request. | |
515 | * @ubi: UBI device description object | |
516 | * @req: the request to check | |
517 | * | |
518 | * This function zero if the request is correct, and %-EINVAL if not. | |
519 | */ | |
520 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
521 | const struct ubi_mkvol_req *req) | |
522 | { | |
523 | int n, err = -EINVAL; | |
524 | ||
525 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
526 | req->name_len < 0) | |
527 | goto bad; | |
528 | ||
529 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
530 | req->vol_id != UBI_VOL_NUM_AUTO) | |
531 | goto bad; | |
532 | ||
533 | if (req->alignment == 0) | |
534 | goto bad; | |
535 | ||
536 | if (req->bytes == 0) | |
537 | goto bad; | |
538 | ||
539 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
540 | req->vol_type != UBI_STATIC_VOLUME) | |
541 | goto bad; | |
542 | ||
543 | if (req->alignment > ubi->leb_size) | |
544 | goto bad; | |
545 | ||
546 | n = req->alignment % ubi->min_io_size; | |
547 | if (req->alignment != 1 && n) | |
548 | goto bad; | |
549 | ||
550 | if (req->name_len > UBI_VOL_NAME_MAX) { | |
551 | err = -ENAMETOOLONG; | |
552 | goto bad; | |
553 | } | |
554 | ||
555 | return 0; | |
556 | ||
557 | bad: | |
558 | dbg_err("bad volume creation request"); | |
559 | ubi_dbg_dump_mkvol_req(req); | |
560 | return err; | |
561 | } | |
562 | ||
563 | /** | |
564 | * verify_rsvol_req - verify volume re-size request. | |
565 | * @ubi: UBI device description object | |
566 | * @req: the request to check | |
567 | * | |
568 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
569 | */ | |
570 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
571 | const struct ubi_rsvol_req *req) | |
572 | { | |
573 | if (req->bytes <= 0) | |
574 | return -EINVAL; | |
575 | ||
576 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
577 | return -EINVAL; | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static int ubi_cdev_ioctl(struct inode *inode, struct file *file, | |
583 | unsigned int cmd, unsigned long arg) | |
584 | { | |
585 | int err = 0; | |
586 | struct ubi_device *ubi; | |
587 | struct ubi_volume_desc *desc; | |
588 | void __user *argp = (void __user *)arg; | |
589 | ||
590 | if (_IOC_NR(cmd) > UBI_CDEV_IOC_MAX_SEQ || | |
591 | _IOC_TYPE(cmd) != UBI_IOC_MAGIC) | |
592 | return -ENOTTY; | |
593 | ||
594 | if (_IOC_DIR(cmd) && _IOC_READ) | |
595 | err = !access_ok(VERIFY_WRITE, argp, _IOC_SIZE(cmd)); | |
596 | else if (_IOC_DIR(cmd) && _IOC_WRITE) | |
597 | err = !access_ok(VERIFY_READ, argp, _IOC_SIZE(cmd)); | |
598 | if (err) | |
599 | return -EFAULT; | |
600 | ||
601 | if (!capable(CAP_SYS_RESOURCE)) | |
602 | return -EPERM; | |
603 | ||
604 | ubi = major_to_device(imajor(inode)); | |
605 | if (IS_ERR(ubi)) | |
606 | return PTR_ERR(ubi); | |
607 | ||
608 | switch (cmd) { | |
609 | /* Create volume command */ | |
610 | case UBI_IOCMKVOL: | |
611 | { | |
612 | struct ubi_mkvol_req req; | |
613 | ||
614 | dbg_msg("create volume"); | |
615 | err = __copy_from_user(&req, argp, | |
616 | sizeof(struct ubi_mkvol_req)); | |
617 | if (err) { | |
618 | err = -EFAULT; | |
619 | break; | |
620 | } | |
621 | ||
622 | err = verify_mkvol_req(ubi, &req); | |
623 | if (err) | |
624 | break; | |
625 | ||
626 | req.name[req.name_len] = '\0'; | |
627 | ||
628 | err = ubi_create_volume(ubi, &req); | |
629 | if (err) | |
630 | break; | |
631 | ||
632 | err = __put_user(req.vol_id, (__user int32_t *)argp); | |
633 | if (err) | |
634 | err = -EFAULT; | |
635 | ||
636 | break; | |
637 | } | |
638 | ||
639 | /* Remove volume command */ | |
640 | case UBI_IOCRMVOL: | |
641 | { | |
642 | int vol_id; | |
643 | ||
644 | dbg_msg("remove volume"); | |
645 | err = __get_user(vol_id, (__user int32_t *)argp); | |
646 | if (err) { | |
647 | err = -EFAULT; | |
648 | break; | |
649 | } | |
650 | ||
651 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
652 | if (IS_ERR(desc)) { | |
653 | err = PTR_ERR(desc); | |
654 | break; | |
655 | } | |
656 | ||
657 | err = ubi_remove_volume(desc); | |
658 | if (err) | |
659 | ubi_close_volume(desc); | |
660 | ||
661 | break; | |
662 | } | |
663 | ||
664 | /* Re-size volume command */ | |
665 | case UBI_IOCRSVOL: | |
666 | { | |
667 | int pebs; | |
668 | uint64_t tmp; | |
669 | struct ubi_rsvol_req req; | |
670 | ||
671 | dbg_msg("re-size volume"); | |
672 | err = __copy_from_user(&req, argp, | |
673 | sizeof(struct ubi_rsvol_req)); | |
674 | if (err) { | |
675 | err = -EFAULT; | |
676 | break; | |
677 | } | |
678 | ||
679 | err = verify_rsvol_req(ubi, &req); | |
680 | if (err) | |
681 | break; | |
682 | ||
683 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
684 | if (IS_ERR(desc)) { | |
685 | err = PTR_ERR(desc); | |
686 | break; | |
687 | } | |
688 | ||
689 | tmp = req.bytes; | |
690 | pebs = !!do_div(tmp, desc->vol->usable_leb_size); | |
691 | pebs += tmp; | |
692 | ||
693 | err = ubi_resize_volume(desc, pebs); | |
694 | ubi_close_volume(desc); | |
695 | break; | |
696 | } | |
697 | ||
698 | default: | |
699 | err = -ENOTTY; | |
700 | break; | |
701 | } | |
702 | ||
703 | return err; | |
704 | } | |
705 | ||
706 | /* UBI character device operations */ | |
707 | struct file_operations ubi_cdev_operations = { | |
708 | .owner = THIS_MODULE, | |
709 | .ioctl = ubi_cdev_ioctl, | |
710 | .llseek = no_llseek | |
711 | }; | |
712 | ||
713 | /* UBI volume character device operations */ | |
714 | struct file_operations ubi_vol_cdev_operations = { | |
715 | .owner = THIS_MODULE, | |
716 | .open = vol_cdev_open, | |
717 | .release = vol_cdev_release, | |
718 | .llseek = vol_cdev_llseek, | |
719 | .read = vol_cdev_read, | |
720 | .write = vol_cdev_write, | |
721 | .ioctl = vol_cdev_ioctl | |
722 | }; |