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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++) | |
49dfc299 | 64 | if (ubi_devices[i] && MAJOR(ubi_devices[i]->cdev.dev) == major) |
801c135c AB |
65 | return ubi_devices[i]; |
66 | BUG(); | |
add0b43c | 67 | return NULL; |
801c135c AB |
68 | } |
69 | ||
70 | /** | |
71 | * get_exclusive - get exclusive access to an UBI volume. | |
72 | * @desc: volume descriptor | |
73 | * | |
74 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
75 | * mode value (positive integer) in case of success and a negative error code | |
76 | * in case of failure. | |
77 | */ | |
78 | static int get_exclusive(struct ubi_volume_desc *desc) | |
79 | { | |
80 | int users, err; | |
81 | struct ubi_volume *vol = desc->vol; | |
82 | ||
83 | spin_lock(&vol->ubi->volumes_lock); | |
84 | users = vol->readers + vol->writers + vol->exclusive; | |
85 | ubi_assert(users > 0); | |
86 | if (users > 1) { | |
87 | dbg_err("%d users for volume %d", users, vol->vol_id); | |
88 | err = -EBUSY; | |
89 | } else { | |
90 | vol->readers = vol->writers = 0; | |
91 | vol->exclusive = 1; | |
92 | err = desc->mode; | |
93 | desc->mode = UBI_EXCLUSIVE; | |
94 | } | |
95 | spin_unlock(&vol->ubi->volumes_lock); | |
96 | ||
97 | return err; | |
98 | } | |
99 | ||
100 | /** | |
101 | * revoke_exclusive - revoke exclusive mode. | |
102 | * @desc: volume descriptor | |
103 | * @mode: new mode to switch to | |
104 | */ | |
105 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
106 | { | |
107 | struct ubi_volume *vol = desc->vol; | |
108 | ||
109 | spin_lock(&vol->ubi->volumes_lock); | |
110 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
111 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
112 | vol->exclusive = 0; | |
113 | if (mode == UBI_READONLY) | |
114 | vol->readers = 1; | |
115 | else if (mode == UBI_READWRITE) | |
116 | vol->writers = 1; | |
117 | else | |
118 | vol->exclusive = 1; | |
119 | spin_unlock(&vol->ubi->volumes_lock); | |
120 | ||
121 | desc->mode = mode; | |
122 | } | |
123 | ||
124 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
125 | { | |
126 | struct ubi_volume_desc *desc; | |
127 | const struct ubi_device *ubi = major_to_device(imajor(inode)); | |
128 | int vol_id = iminor(inode) - 1; | |
129 | int mode; | |
130 | ||
131 | if (file->f_mode & FMODE_WRITE) | |
132 | mode = UBI_READWRITE; | |
133 | else | |
134 | mode = UBI_READONLY; | |
135 | ||
136 | dbg_msg("open volume %d, mode %d", vol_id, mode); | |
137 | ||
138 | desc = ubi_open_volume(ubi->ubi_num, vol_id, mode); | |
139 | if (IS_ERR(desc)) | |
140 | return PTR_ERR(desc); | |
141 | ||
142 | file->private_data = desc; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
147 | { | |
148 | struct ubi_volume_desc *desc = file->private_data; | |
149 | struct ubi_volume *vol = desc->vol; | |
150 | ||
151 | dbg_msg("release volume %d, mode %d", vol->vol_id, desc->mode); | |
152 | ||
153 | if (vol->updating) { | |
154 | ubi_warn("update of volume %d not finished, volume is damaged", | |
155 | vol->vol_id); | |
156 | vol->updating = 0; | |
92ad8f37 | 157 | vfree(vol->upd_buf); |
801c135c AB |
158 | } |
159 | ||
160 | ubi_close_volume(desc); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
165 | { | |
166 | struct ubi_volume_desc *desc = file->private_data; | |
167 | struct ubi_volume *vol = desc->vol; | |
168 | loff_t new_offset; | |
169 | ||
170 | if (vol->updating) { | |
171 | /* Update is in progress, seeking is prohibited */ | |
172 | dbg_err("updating"); | |
173 | return -EBUSY; | |
174 | } | |
175 | ||
176 | switch (origin) { | |
177 | case 0: /* SEEK_SET */ | |
178 | new_offset = offset; | |
179 | break; | |
180 | case 1: /* SEEK_CUR */ | |
181 | new_offset = file->f_pos + offset; | |
182 | break; | |
183 | case 2: /* SEEK_END */ | |
184 | new_offset = vol->used_bytes + offset; | |
185 | break; | |
186 | default: | |
187 | return -EINVAL; | |
188 | } | |
189 | ||
190 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
191 | dbg_err("bad seek %lld", new_offset); | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | dbg_msg("seek volume %d, offset %lld, origin %d, new offset %lld", | |
196 | vol->vol_id, offset, origin, new_offset); | |
197 | ||
198 | file->f_pos = new_offset; | |
199 | return new_offset; | |
200 | } | |
201 | ||
202 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, | |
203 | loff_t *offp) | |
204 | { | |
205 | struct ubi_volume_desc *desc = file->private_data; | |
206 | struct ubi_volume *vol = desc->vol; | |
207 | struct ubi_device *ubi = vol->ubi; | |
208 | int err, lnum, off, len, vol_id = desc->vol->vol_id, tbuf_size; | |
209 | size_t count_save = count; | |
210 | void *tbuf; | |
211 | uint64_t tmp; | |
212 | ||
213 | dbg_msg("read %zd bytes from offset %lld of volume %d", | |
214 | count, *offp, vol_id); | |
215 | ||
216 | if (vol->updating) { | |
217 | dbg_err("updating"); | |
218 | return -EBUSY; | |
219 | } | |
220 | if (vol->upd_marker) { | |
221 | dbg_err("damaged volume, update marker is set"); | |
222 | return -EBADF; | |
223 | } | |
224 | if (*offp == vol->used_bytes || count == 0) | |
225 | return 0; | |
226 | ||
227 | if (vol->corrupted) | |
228 | dbg_msg("read from corrupted volume %d", vol_id); | |
229 | ||
230 | if (*offp + count > vol->used_bytes) | |
231 | count_save = count = vol->used_bytes - *offp; | |
232 | ||
233 | tbuf_size = vol->usable_leb_size; | |
234 | if (count < tbuf_size) | |
235 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 236 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
237 | if (!tbuf) |
238 | return -ENOMEM; | |
239 | ||
240 | len = count > tbuf_size ? tbuf_size : count; | |
241 | ||
242 | tmp = *offp; | |
243 | off = do_div(tmp, vol->usable_leb_size); | |
244 | lnum = tmp; | |
245 | ||
246 | do { | |
247 | cond_resched(); | |
248 | ||
249 | if (off + len >= vol->usable_leb_size) | |
250 | len = vol->usable_leb_size - off; | |
251 | ||
252 | err = ubi_eba_read_leb(ubi, vol_id, lnum, tbuf, off, len, 0); | |
253 | if (err) | |
254 | break; | |
255 | ||
256 | off += len; | |
257 | if (off == vol->usable_leb_size) { | |
258 | lnum += 1; | |
259 | off -= vol->usable_leb_size; | |
260 | } | |
261 | ||
262 | count -= len; | |
263 | *offp += len; | |
264 | ||
265 | err = copy_to_user(buf, tbuf, len); | |
266 | if (err) { | |
267 | err = -EFAULT; | |
268 | break; | |
269 | } | |
270 | ||
271 | buf += len; | |
272 | len = count > tbuf_size ? tbuf_size : count; | |
273 | } while (count); | |
274 | ||
92ad8f37 | 275 | vfree(tbuf); |
801c135c AB |
276 | return err ? err : count_save - count; |
277 | } | |
278 | ||
279 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
280 | ||
281 | /* | |
282 | * This function allows to directly write to dynamic UBI volumes, without | |
283 | * issuing the volume update operation. Available only as a debugging feature. | |
284 | * Very useful for testing UBI. | |
285 | */ | |
286 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
287 | size_t count, loff_t *offp) | |
288 | { | |
289 | struct ubi_volume_desc *desc = file->private_data; | |
290 | struct ubi_volume *vol = desc->vol; | |
291 | struct ubi_device *ubi = vol->ubi; | |
292 | int lnum, off, len, tbuf_size, vol_id = vol->vol_id, err = 0; | |
293 | size_t count_save = count; | |
294 | char *tbuf; | |
295 | uint64_t tmp; | |
296 | ||
297 | dbg_msg("requested: write %zd bytes to offset %lld of volume %u", | |
298 | count, *offp, desc->vol->vol_id); | |
299 | ||
300 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
301 | return -EROFS; | |
302 | ||
303 | tmp = *offp; | |
304 | off = do_div(tmp, vol->usable_leb_size); | |
305 | lnum = tmp; | |
306 | ||
307 | if (off % ubi->min_io_size) { | |
308 | dbg_err("unaligned position"); | |
309 | return -EINVAL; | |
310 | } | |
311 | ||
312 | if (*offp + count > vol->used_bytes) | |
313 | count_save = count = vol->used_bytes - *offp; | |
314 | ||
315 | /* We can write only in fractions of the minimum I/O unit */ | |
316 | if (count % ubi->min_io_size) { | |
317 | dbg_err("unaligned write length"); | |
318 | return -EINVAL; | |
319 | } | |
320 | ||
321 | tbuf_size = vol->usable_leb_size; | |
322 | if (count < tbuf_size) | |
323 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 324 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
325 | if (!tbuf) |
326 | return -ENOMEM; | |
327 | ||
328 | len = count > tbuf_size ? tbuf_size : count; | |
329 | ||
330 | while (count) { | |
331 | cond_resched(); | |
332 | ||
333 | if (off + len >= vol->usable_leb_size) | |
334 | len = vol->usable_leb_size - off; | |
335 | ||
336 | err = copy_from_user(tbuf, buf, len); | |
337 | if (err) { | |
338 | err = -EFAULT; | |
339 | break; | |
340 | } | |
341 | ||
342 | err = ubi_eba_write_leb(ubi, vol_id, lnum, tbuf, off, len, | |
343 | UBI_UNKNOWN); | |
344 | if (err) | |
345 | break; | |
346 | ||
347 | off += len; | |
348 | if (off == vol->usable_leb_size) { | |
349 | lnum += 1; | |
350 | off -= vol->usable_leb_size; | |
351 | } | |
352 | ||
353 | count -= len; | |
354 | *offp += len; | |
355 | buf += len; | |
356 | len = count > tbuf_size ? tbuf_size : count; | |
357 | } | |
358 | ||
92ad8f37 | 359 | vfree(tbuf); |
801c135c AB |
360 | return err ? err : count_save - count; |
361 | } | |
362 | ||
363 | #else | |
364 | #define vol_cdev_direct_write(file, buf, count, offp) -EPERM | |
365 | #endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */ | |
366 | ||
367 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, | |
368 | size_t count, loff_t *offp) | |
369 | { | |
370 | int err = 0; | |
371 | struct ubi_volume_desc *desc = file->private_data; | |
372 | struct ubi_volume *vol = desc->vol; | |
373 | struct ubi_device *ubi = vol->ubi; | |
374 | ||
375 | if (!vol->updating) | |
376 | return vol_cdev_direct_write(file, buf, count, offp); | |
377 | ||
378 | err = ubi_more_update_data(ubi, vol->vol_id, buf, count); | |
379 | if (err < 0) { | |
380 | ubi_err("cannot write %zd bytes of update data", count); | |
381 | return err; | |
382 | } | |
383 | ||
384 | if (err) { | |
385 | /* | |
386 | * Update is finished, @err contains number of actually written | |
387 | * bytes now. | |
388 | */ | |
389 | count = err; | |
390 | ||
391 | err = ubi_check_volume(ubi, vol->vol_id); | |
392 | if (err < 0) | |
393 | return err; | |
394 | ||
395 | if (err) { | |
396 | ubi_warn("volume %d on UBI device %d is corrupted", | |
397 | vol->vol_id, ubi->ubi_num); | |
398 | vol->corrupted = 1; | |
399 | } | |
400 | vol->checked = 1; | |
941dfb07 | 401 | ubi_gluebi_updated(vol); |
801c135c AB |
402 | revoke_exclusive(desc, UBI_READWRITE); |
403 | } | |
404 | ||
405 | *offp += count; | |
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 | ||
440 | rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad); | |
441 | if (bytes < 0 || bytes > rsvd_bytes) { | |
442 | err = -EINVAL; | |
443 | break; | |
444 | } | |
445 | ||
446 | err = get_exclusive(desc); | |
447 | if (err < 0) | |
448 | break; | |
449 | ||
450 | err = ubi_start_update(ubi, vol->vol_id, bytes); | |
451 | if (bytes == 0) | |
452 | revoke_exclusive(desc, UBI_READWRITE); | |
453 | ||
454 | file->f_pos = 0; | |
455 | break; | |
456 | } | |
457 | ||
458 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
459 | /* Logical eraseblock erasure command */ | |
460 | case UBI_IOCEBER: | |
461 | { | |
462 | int32_t lnum; | |
463 | ||
bf07803a | 464 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
465 | if (err) { |
466 | err = -EFAULT; | |
467 | break; | |
468 | } | |
469 | ||
470 | if (desc->mode == UBI_READONLY) { | |
471 | err = -EROFS; | |
472 | break; | |
473 | } | |
474 | ||
475 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
476 | err = -EINVAL; | |
477 | break; | |
478 | } | |
479 | ||
480 | if (vol->vol_type != UBI_DYNAMIC_VOLUME) { | |
481 | err = -EROFS; | |
482 | break; | |
483 | } | |
484 | ||
485 | dbg_msg("erase LEB %d:%d", vol->vol_id, lnum); | |
486 | err = ubi_eba_unmap_leb(ubi, vol->vol_id, lnum); | |
487 | if (err) | |
488 | break; | |
489 | ||
490 | err = ubi_wl_flush(ubi); | |
491 | break; | |
492 | } | |
493 | #endif | |
494 | ||
495 | default: | |
496 | err = -ENOTTY; | |
497 | break; | |
498 | } | |
499 | ||
500 | return err; | |
501 | } | |
502 | ||
503 | /** | |
504 | * verify_mkvol_req - verify volume creation request. | |
505 | * @ubi: UBI device description object | |
506 | * @req: the request to check | |
507 | * | |
508 | * This function zero if the request is correct, and %-EINVAL if not. | |
509 | */ | |
510 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
511 | const struct ubi_mkvol_req *req) | |
512 | { | |
513 | int n, err = -EINVAL; | |
514 | ||
515 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
516 | req->name_len < 0) | |
517 | goto bad; | |
518 | ||
519 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
520 | req->vol_id != UBI_VOL_NUM_AUTO) | |
521 | goto bad; | |
522 | ||
523 | if (req->alignment == 0) | |
524 | goto bad; | |
525 | ||
526 | if (req->bytes == 0) | |
527 | goto bad; | |
528 | ||
529 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
530 | req->vol_type != UBI_STATIC_VOLUME) | |
531 | goto bad; | |
532 | ||
533 | if (req->alignment > ubi->leb_size) | |
534 | goto bad; | |
535 | ||
536 | n = req->alignment % ubi->min_io_size; | |
537 | if (req->alignment != 1 && n) | |
538 | goto bad; | |
539 | ||
540 | if (req->name_len > UBI_VOL_NAME_MAX) { | |
541 | err = -ENAMETOOLONG; | |
542 | goto bad; | |
543 | } | |
544 | ||
545 | return 0; | |
546 | ||
547 | bad: | |
548 | dbg_err("bad volume creation request"); | |
549 | ubi_dbg_dump_mkvol_req(req); | |
550 | return err; | |
551 | } | |
552 | ||
553 | /** | |
554 | * verify_rsvol_req - verify volume re-size request. | |
555 | * @ubi: UBI device description object | |
556 | * @req: the request to check | |
557 | * | |
558 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
559 | */ | |
560 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
561 | const struct ubi_rsvol_req *req) | |
562 | { | |
563 | if (req->bytes <= 0) | |
564 | return -EINVAL; | |
565 | ||
566 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
567 | return -EINVAL; | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static int ubi_cdev_ioctl(struct inode *inode, struct file *file, | |
573 | unsigned int cmd, unsigned long arg) | |
574 | { | |
575 | int err = 0; | |
576 | struct ubi_device *ubi; | |
577 | struct ubi_volume_desc *desc; | |
578 | void __user *argp = (void __user *)arg; | |
579 | ||
801c135c AB |
580 | if (!capable(CAP_SYS_RESOURCE)) |
581 | return -EPERM; | |
582 | ||
583 | ubi = major_to_device(imajor(inode)); | |
584 | if (IS_ERR(ubi)) | |
585 | return PTR_ERR(ubi); | |
586 | ||
587 | switch (cmd) { | |
588 | /* Create volume command */ | |
589 | case UBI_IOCMKVOL: | |
590 | { | |
591 | struct ubi_mkvol_req req; | |
592 | ||
593 | dbg_msg("create volume"); | |
bf07803a | 594 | err = copy_from_user(&req, argp, |
801c135c AB |
595 | sizeof(struct ubi_mkvol_req)); |
596 | if (err) { | |
597 | err = -EFAULT; | |
598 | break; | |
599 | } | |
600 | ||
601 | err = verify_mkvol_req(ubi, &req); | |
602 | if (err) | |
603 | break; | |
604 | ||
605 | req.name[req.name_len] = '\0'; | |
606 | ||
607 | err = ubi_create_volume(ubi, &req); | |
608 | if (err) | |
609 | break; | |
610 | ||
bf07803a | 611 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
612 | if (err) |
613 | err = -EFAULT; | |
614 | ||
615 | break; | |
616 | } | |
617 | ||
618 | /* Remove volume command */ | |
619 | case UBI_IOCRMVOL: | |
620 | { | |
621 | int vol_id; | |
622 | ||
623 | dbg_msg("remove volume"); | |
bf07803a | 624 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
625 | if (err) { |
626 | err = -EFAULT; | |
627 | break; | |
628 | } | |
629 | ||
630 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
631 | if (IS_ERR(desc)) { | |
632 | err = PTR_ERR(desc); | |
633 | break; | |
634 | } | |
635 | ||
636 | err = ubi_remove_volume(desc); | |
637 | if (err) | |
638 | ubi_close_volume(desc); | |
639 | ||
640 | break; | |
641 | } | |
642 | ||
643 | /* Re-size volume command */ | |
644 | case UBI_IOCRSVOL: | |
645 | { | |
646 | int pebs; | |
647 | uint64_t tmp; | |
648 | struct ubi_rsvol_req req; | |
649 | ||
650 | dbg_msg("re-size volume"); | |
bf07803a | 651 | err = copy_from_user(&req, argp, |
801c135c AB |
652 | sizeof(struct ubi_rsvol_req)); |
653 | if (err) { | |
654 | err = -EFAULT; | |
655 | break; | |
656 | } | |
657 | ||
658 | err = verify_rsvol_req(ubi, &req); | |
659 | if (err) | |
660 | break; | |
661 | ||
662 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
663 | if (IS_ERR(desc)) { | |
664 | err = PTR_ERR(desc); | |
665 | break; | |
666 | } | |
667 | ||
668 | tmp = req.bytes; | |
669 | pebs = !!do_div(tmp, desc->vol->usable_leb_size); | |
670 | pebs += tmp; | |
671 | ||
672 | err = ubi_resize_volume(desc, pebs); | |
673 | ubi_close_volume(desc); | |
674 | break; | |
675 | } | |
676 | ||
677 | default: | |
678 | err = -ENOTTY; | |
679 | break; | |
680 | } | |
681 | ||
682 | return err; | |
683 | } | |
684 | ||
685 | /* UBI character device operations */ | |
686 | struct file_operations ubi_cdev_operations = { | |
687 | .owner = THIS_MODULE, | |
688 | .ioctl = ubi_cdev_ioctl, | |
f800f09b | 689 | .llseek = no_llseek, |
801c135c AB |
690 | }; |
691 | ||
692 | /* UBI volume character device operations */ | |
693 | struct file_operations ubi_vol_cdev_operations = { | |
694 | .owner = THIS_MODULE, | |
695 | .open = vol_cdev_open, | |
696 | .release = vol_cdev_release, | |
697 | .llseek = vol_cdev_llseek, | |
698 | .read = vol_cdev_read, | |
699 | .write = vol_cdev_write, | |
f800f09b | 700 | .ioctl = vol_cdev_ioctl, |
801c135c | 701 | }; |