Commit | Line | Data |
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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | /* | |
22 | * This file includes implementation of UBI character device operations. | |
23 | * | |
24 | * There are two kinds of character devices in UBI: UBI character devices and | |
25 | * UBI volume character devices. UBI character devices allow users to | |
26 | * manipulate whole volumes: create, remove, and re-size them. Volume character | |
27 | * devices provide volume I/O capabilities. | |
28 | * | |
29 | * Major and minor numbers are assigned dynamically to both UBI and volume | |
30 | * character devices. | |
9f961b57 AB |
31 | * |
32 | * Well, there is the third kind of character devices - the UBI control | |
33 | * character device, which allows to manipulate by UBI devices - create and | |
34 | * delete them. In other words, it is used for attaching and detaching MTD | |
35 | * devices. | |
801c135c AB |
36 | */ |
37 | ||
38 | #include <linux/module.h> | |
39 | #include <linux/stat.h> | |
40 | #include <linux/ioctl.h> | |
41 | #include <linux/capability.h> | |
42 | #include <mtd/ubi-user.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/div64.h> | |
45 | #include "ubi.h" | |
46 | ||
47 | /* | |
48 | * Maximum sequence numbers of UBI and volume character device IOCTLs (direct | |
49 | * logical eraseblock erase is a debug-only feature). | |
50 | */ | |
51 | #define UBI_CDEV_IOC_MAX_SEQ 2 | |
52 | #ifndef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
53 | #define VOL_CDEV_IOC_MAX_SEQ 1 | |
54 | #else | |
55 | #define VOL_CDEV_IOC_MAX_SEQ 2 | |
56 | #endif | |
57 | ||
58 | /** | |
59 | * major_to_device - get UBI device object by character device major number. | |
60 | * @major: major number | |
61 | * | |
62 | * This function returns a pointer to the UBI device object. | |
63 | */ | |
64 | static struct ubi_device *major_to_device(int major) | |
65 | { | |
66 | int i; | |
67 | ||
b96bf4c3 | 68 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
49dfc299 | 69 | if (ubi_devices[i] && MAJOR(ubi_devices[i]->cdev.dev) == major) |
801c135c AB |
70 | return ubi_devices[i]; |
71 | BUG(); | |
add0b43c | 72 | return NULL; |
801c135c AB |
73 | } |
74 | ||
75 | /** | |
76 | * get_exclusive - get exclusive access to an UBI volume. | |
77 | * @desc: volume descriptor | |
78 | * | |
79 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
80 | * mode value (positive integer) in case of success and a negative error code | |
81 | * in case of failure. | |
82 | */ | |
83 | static int get_exclusive(struct ubi_volume_desc *desc) | |
84 | { | |
85 | int users, err; | |
86 | struct ubi_volume *vol = desc->vol; | |
87 | ||
88 | spin_lock(&vol->ubi->volumes_lock); | |
89 | users = vol->readers + vol->writers + vol->exclusive; | |
90 | ubi_assert(users > 0); | |
91 | if (users > 1) { | |
92 | dbg_err("%d users for volume %d", users, vol->vol_id); | |
93 | err = -EBUSY; | |
94 | } else { | |
95 | vol->readers = vol->writers = 0; | |
96 | vol->exclusive = 1; | |
97 | err = desc->mode; | |
98 | desc->mode = UBI_EXCLUSIVE; | |
99 | } | |
100 | spin_unlock(&vol->ubi->volumes_lock); | |
101 | ||
102 | return err; | |
103 | } | |
104 | ||
105 | /** | |
106 | * revoke_exclusive - revoke exclusive mode. | |
107 | * @desc: volume descriptor | |
108 | * @mode: new mode to switch to | |
109 | */ | |
110 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
111 | { | |
112 | struct ubi_volume *vol = desc->vol; | |
113 | ||
114 | spin_lock(&vol->ubi->volumes_lock); | |
115 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
116 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
117 | vol->exclusive = 0; | |
118 | if (mode == UBI_READONLY) | |
119 | vol->readers = 1; | |
120 | else if (mode == UBI_READWRITE) | |
121 | vol->writers = 1; | |
122 | else | |
123 | vol->exclusive = 1; | |
124 | spin_unlock(&vol->ubi->volumes_lock); | |
125 | ||
126 | desc->mode = mode; | |
127 | } | |
128 | ||
129 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
130 | { | |
131 | struct ubi_volume_desc *desc; | |
132 | const struct ubi_device *ubi = major_to_device(imajor(inode)); | |
133 | int vol_id = iminor(inode) - 1; | |
134 | int mode; | |
135 | ||
136 | if (file->f_mode & FMODE_WRITE) | |
137 | mode = UBI_READWRITE; | |
138 | else | |
139 | mode = UBI_READONLY; | |
140 | ||
141 | dbg_msg("open volume %d, mode %d", vol_id, mode); | |
142 | ||
143 | desc = ubi_open_volume(ubi->ubi_num, vol_id, mode); | |
144 | if (IS_ERR(desc)) | |
145 | return PTR_ERR(desc); | |
146 | ||
147 | file->private_data = desc; | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
152 | { | |
153 | struct ubi_volume_desc *desc = file->private_data; | |
154 | struct ubi_volume *vol = desc->vol; | |
155 | ||
156 | dbg_msg("release volume %d, mode %d", vol->vol_id, desc->mode); | |
157 | ||
158 | if (vol->updating) { | |
159 | ubi_warn("update of volume %d not finished, volume is damaged", | |
160 | vol->vol_id); | |
161 | vol->updating = 0; | |
92ad8f37 | 162 | vfree(vol->upd_buf); |
801c135c AB |
163 | } |
164 | ||
165 | ubi_close_volume(desc); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
170 | { | |
171 | struct ubi_volume_desc *desc = file->private_data; | |
172 | struct ubi_volume *vol = desc->vol; | |
173 | loff_t new_offset; | |
174 | ||
175 | if (vol->updating) { | |
176 | /* Update is in progress, seeking is prohibited */ | |
177 | dbg_err("updating"); | |
178 | return -EBUSY; | |
179 | } | |
180 | ||
181 | switch (origin) { | |
182 | case 0: /* SEEK_SET */ | |
183 | new_offset = offset; | |
184 | break; | |
185 | case 1: /* SEEK_CUR */ | |
186 | new_offset = file->f_pos + offset; | |
187 | break; | |
188 | case 2: /* SEEK_END */ | |
189 | new_offset = vol->used_bytes + offset; | |
190 | break; | |
191 | default: | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
196 | dbg_err("bad seek %lld", new_offset); | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
200 | dbg_msg("seek volume %d, offset %lld, origin %d, new offset %lld", | |
201 | vol->vol_id, offset, origin, new_offset); | |
202 | ||
203 | file->f_pos = new_offset; | |
204 | return new_offset; | |
205 | } | |
206 | ||
207 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, | |
208 | loff_t *offp) | |
209 | { | |
210 | struct ubi_volume_desc *desc = file->private_data; | |
211 | struct ubi_volume *vol = desc->vol; | |
212 | struct ubi_device *ubi = vol->ubi; | |
213 | int err, lnum, off, len, vol_id = desc->vol->vol_id, tbuf_size; | |
214 | size_t count_save = count; | |
215 | void *tbuf; | |
216 | uint64_t tmp; | |
217 | ||
218 | dbg_msg("read %zd bytes from offset %lld of volume %d", | |
219 | count, *offp, vol_id); | |
220 | ||
221 | if (vol->updating) { | |
222 | dbg_err("updating"); | |
223 | return -EBUSY; | |
224 | } | |
225 | if (vol->upd_marker) { | |
226 | dbg_err("damaged volume, update marker is set"); | |
227 | return -EBADF; | |
228 | } | |
229 | if (*offp == vol->used_bytes || count == 0) | |
230 | return 0; | |
231 | ||
232 | if (vol->corrupted) | |
233 | dbg_msg("read from corrupted volume %d", vol_id); | |
234 | ||
235 | if (*offp + count > vol->used_bytes) | |
236 | count_save = count = vol->used_bytes - *offp; | |
237 | ||
238 | tbuf_size = vol->usable_leb_size; | |
239 | if (count < tbuf_size) | |
240 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 241 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
242 | if (!tbuf) |
243 | return -ENOMEM; | |
244 | ||
245 | len = count > tbuf_size ? tbuf_size : count; | |
246 | ||
247 | tmp = *offp; | |
248 | off = do_div(tmp, vol->usable_leb_size); | |
249 | lnum = tmp; | |
250 | ||
251 | do { | |
252 | cond_resched(); | |
253 | ||
254 | if (off + len >= vol->usable_leb_size) | |
255 | len = vol->usable_leb_size - off; | |
256 | ||
89b96b69 | 257 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
258 | if (err) |
259 | break; | |
260 | ||
261 | off += len; | |
262 | if (off == vol->usable_leb_size) { | |
263 | lnum += 1; | |
264 | off -= vol->usable_leb_size; | |
265 | } | |
266 | ||
267 | count -= len; | |
268 | *offp += len; | |
269 | ||
270 | err = copy_to_user(buf, tbuf, len); | |
271 | if (err) { | |
272 | err = -EFAULT; | |
273 | break; | |
274 | } | |
275 | ||
276 | buf += len; | |
277 | len = count > tbuf_size ? tbuf_size : count; | |
278 | } while (count); | |
279 | ||
92ad8f37 | 280 | vfree(tbuf); |
801c135c AB |
281 | return err ? err : count_save - count; |
282 | } | |
283 | ||
284 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
285 | ||
286 | /* | |
287 | * This function allows to directly write to dynamic UBI volumes, without | |
288 | * issuing the volume update operation. Available only as a debugging feature. | |
289 | * Very useful for testing UBI. | |
290 | */ | |
291 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
292 | size_t count, loff_t *offp) | |
293 | { | |
294 | struct ubi_volume_desc *desc = file->private_data; | |
295 | struct ubi_volume *vol = desc->vol; | |
296 | struct ubi_device *ubi = vol->ubi; | |
297 | int lnum, off, len, tbuf_size, vol_id = vol->vol_id, err = 0; | |
298 | size_t count_save = count; | |
299 | char *tbuf; | |
300 | uint64_t tmp; | |
301 | ||
302 | dbg_msg("requested: write %zd bytes to offset %lld of volume %u", | |
303 | count, *offp, desc->vol->vol_id); | |
304 | ||
305 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
306 | return -EROFS; | |
307 | ||
308 | tmp = *offp; | |
309 | off = do_div(tmp, vol->usable_leb_size); | |
310 | lnum = tmp; | |
311 | ||
312 | if (off % ubi->min_io_size) { | |
313 | dbg_err("unaligned position"); | |
314 | return -EINVAL; | |
315 | } | |
316 | ||
317 | if (*offp + count > vol->used_bytes) | |
318 | count_save = count = vol->used_bytes - *offp; | |
319 | ||
320 | /* We can write only in fractions of the minimum I/O unit */ | |
321 | if (count % ubi->min_io_size) { | |
322 | dbg_err("unaligned write length"); | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
326 | tbuf_size = vol->usable_leb_size; | |
327 | if (count < tbuf_size) | |
328 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 329 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
330 | if (!tbuf) |
331 | return -ENOMEM; | |
332 | ||
333 | len = count > tbuf_size ? tbuf_size : count; | |
334 | ||
335 | while (count) { | |
336 | cond_resched(); | |
337 | ||
338 | if (off + len >= vol->usable_leb_size) | |
339 | len = vol->usable_leb_size - off; | |
340 | ||
341 | err = copy_from_user(tbuf, buf, len); | |
342 | if (err) { | |
343 | err = -EFAULT; | |
344 | break; | |
345 | } | |
346 | ||
89b96b69 | 347 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len, |
801c135c AB |
348 | UBI_UNKNOWN); |
349 | if (err) | |
350 | break; | |
351 | ||
352 | off += len; | |
353 | if (off == vol->usable_leb_size) { | |
354 | lnum += 1; | |
355 | off -= vol->usable_leb_size; | |
356 | } | |
357 | ||
358 | count -= len; | |
359 | *offp += len; | |
360 | buf += len; | |
361 | len = count > tbuf_size ? tbuf_size : count; | |
362 | } | |
363 | ||
92ad8f37 | 364 | vfree(tbuf); |
801c135c AB |
365 | return err ? err : count_save - count; |
366 | } | |
367 | ||
368 | #else | |
369 | #define vol_cdev_direct_write(file, buf, count, offp) -EPERM | |
370 | #endif /* CONFIG_MTD_UBI_DEBUG_USERSPACE_IO */ | |
371 | ||
372 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, | |
373 | size_t count, loff_t *offp) | |
374 | { | |
375 | int err = 0; | |
376 | struct ubi_volume_desc *desc = file->private_data; | |
377 | struct ubi_volume *vol = desc->vol; | |
378 | struct ubi_device *ubi = vol->ubi; | |
379 | ||
380 | if (!vol->updating) | |
381 | return vol_cdev_direct_write(file, buf, count, offp); | |
382 | ||
383 | err = ubi_more_update_data(ubi, vol->vol_id, buf, count); | |
384 | if (err < 0) { | |
01f7b309 AB |
385 | ubi_err("cannot write %zd bytes of update data, error %d", |
386 | count, err); | |
801c135c AB |
387 | return err; |
388 | } | |
389 | ||
390 | if (err) { | |
391 | /* | |
392 | * Update is finished, @err contains number of actually written | |
393 | * bytes now. | |
394 | */ | |
395 | count = err; | |
396 | ||
397 | err = ubi_check_volume(ubi, vol->vol_id); | |
398 | if (err < 0) | |
399 | return err; | |
400 | ||
401 | if (err) { | |
402 | ubi_warn("volume %d on UBI device %d is corrupted", | |
403 | vol->vol_id, ubi->ubi_num); | |
404 | vol->corrupted = 1; | |
405 | } | |
406 | vol->checked = 1; | |
941dfb07 | 407 | ubi_gluebi_updated(vol); |
801c135c AB |
408 | revoke_exclusive(desc, UBI_READWRITE); |
409 | } | |
410 | ||
411 | *offp += count; | |
412 | return count; | |
413 | } | |
414 | ||
415 | static int vol_cdev_ioctl(struct inode *inode, struct file *file, | |
416 | unsigned int cmd, unsigned long arg) | |
417 | { | |
418 | int err = 0; | |
419 | struct ubi_volume_desc *desc = file->private_data; | |
420 | struct ubi_volume *vol = desc->vol; | |
421 | struct ubi_device *ubi = vol->ubi; | |
422 | void __user *argp = (void __user *)arg; | |
423 | ||
801c135c | 424 | switch (cmd) { |
801c135c AB |
425 | /* Volume update command */ |
426 | case UBI_IOCVOLUP: | |
427 | { | |
428 | int64_t bytes, rsvd_bytes; | |
429 | ||
430 | if (!capable(CAP_SYS_RESOURCE)) { | |
431 | err = -EPERM; | |
432 | break; | |
433 | } | |
434 | ||
435 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
436 | if (err) { | |
437 | err = -EFAULT; | |
438 | break; | |
439 | } | |
440 | ||
441 | if (desc->mode == UBI_READONLY) { | |
442 | err = -EROFS; | |
443 | break; | |
444 | } | |
445 | ||
446 | rsvd_bytes = vol->reserved_pebs * (ubi->leb_size-vol->data_pad); | |
447 | if (bytes < 0 || bytes > rsvd_bytes) { | |
448 | err = -EINVAL; | |
449 | break; | |
450 | } | |
451 | ||
452 | err = get_exclusive(desc); | |
453 | if (err < 0) | |
454 | break; | |
455 | ||
456 | err = ubi_start_update(ubi, vol->vol_id, bytes); | |
457 | if (bytes == 0) | |
458 | revoke_exclusive(desc, UBI_READWRITE); | |
459 | ||
460 | file->f_pos = 0; | |
461 | break; | |
462 | } | |
463 | ||
464 | #ifdef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO | |
465 | /* Logical eraseblock erasure command */ | |
466 | case UBI_IOCEBER: | |
467 | { | |
468 | int32_t lnum; | |
469 | ||
bf07803a | 470 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
471 | if (err) { |
472 | err = -EFAULT; | |
473 | break; | |
474 | } | |
475 | ||
476 | if (desc->mode == UBI_READONLY) { | |
477 | err = -EROFS; | |
478 | break; | |
479 | } | |
480 | ||
481 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
482 | err = -EINVAL; | |
483 | break; | |
484 | } | |
485 | ||
486 | if (vol->vol_type != UBI_DYNAMIC_VOLUME) { | |
487 | err = -EROFS; | |
488 | break; | |
489 | } | |
490 | ||
491 | dbg_msg("erase LEB %d:%d", vol->vol_id, lnum); | |
89b96b69 | 492 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
493 | if (err) |
494 | break; | |
495 | ||
496 | err = ubi_wl_flush(ubi); | |
497 | break; | |
498 | } | |
499 | #endif | |
500 | ||
501 | default: | |
502 | err = -ENOTTY; | |
503 | break; | |
504 | } | |
505 | ||
506 | return err; | |
507 | } | |
508 | ||
509 | /** | |
510 | * verify_mkvol_req - verify volume creation request. | |
511 | * @ubi: UBI device description object | |
512 | * @req: the request to check | |
513 | * | |
514 | * This function zero if the request is correct, and %-EINVAL if not. | |
515 | */ | |
516 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
517 | const struct ubi_mkvol_req *req) | |
518 | { | |
519 | int n, err = -EINVAL; | |
520 | ||
521 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
522 | req->name_len < 0) | |
523 | goto bad; | |
524 | ||
525 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
526 | req->vol_id != UBI_VOL_NUM_AUTO) | |
527 | goto bad; | |
528 | ||
529 | if (req->alignment == 0) | |
530 | goto bad; | |
531 | ||
532 | if (req->bytes == 0) | |
533 | goto bad; | |
534 | ||
535 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
536 | req->vol_type != UBI_STATIC_VOLUME) | |
537 | goto bad; | |
538 | ||
539 | if (req->alignment > ubi->leb_size) | |
540 | goto bad; | |
541 | ||
542 | n = req->alignment % ubi->min_io_size; | |
543 | if (req->alignment != 1 && n) | |
544 | goto bad; | |
545 | ||
546 | if (req->name_len > UBI_VOL_NAME_MAX) { | |
547 | err = -ENAMETOOLONG; | |
548 | goto bad; | |
549 | } | |
550 | ||
551 | return 0; | |
552 | ||
553 | bad: | |
554 | dbg_err("bad volume creation request"); | |
555 | ubi_dbg_dump_mkvol_req(req); | |
556 | return err; | |
557 | } | |
558 | ||
559 | /** | |
560 | * verify_rsvol_req - verify volume re-size request. | |
561 | * @ubi: UBI device description object | |
562 | * @req: the request to check | |
563 | * | |
564 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
565 | */ | |
566 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
567 | const struct ubi_rsvol_req *req) | |
568 | { | |
569 | if (req->bytes <= 0) | |
570 | return -EINVAL; | |
571 | ||
572 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
573 | return -EINVAL; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int ubi_cdev_ioctl(struct inode *inode, struct file *file, | |
579 | unsigned int cmd, unsigned long arg) | |
580 | { | |
581 | int err = 0; | |
582 | struct ubi_device *ubi; | |
583 | struct ubi_volume_desc *desc; | |
584 | void __user *argp = (void __user *)arg; | |
585 | ||
801c135c AB |
586 | if (!capable(CAP_SYS_RESOURCE)) |
587 | return -EPERM; | |
588 | ||
589 | ubi = major_to_device(imajor(inode)); | |
590 | if (IS_ERR(ubi)) | |
591 | return PTR_ERR(ubi); | |
592 | ||
593 | switch (cmd) { | |
594 | /* Create volume command */ | |
595 | case UBI_IOCMKVOL: | |
596 | { | |
597 | struct ubi_mkvol_req req; | |
598 | ||
599 | dbg_msg("create volume"); | |
bf07803a | 600 | err = copy_from_user(&req, argp, |
801c135c AB |
601 | sizeof(struct ubi_mkvol_req)); |
602 | if (err) { | |
603 | err = -EFAULT; | |
604 | break; | |
605 | } | |
606 | ||
607 | err = verify_mkvol_req(ubi, &req); | |
608 | if (err) | |
609 | break; | |
610 | ||
611 | req.name[req.name_len] = '\0'; | |
612 | ||
40e4d0c1 | 613 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 614 | err = ubi_create_volume(ubi, &req); |
40e4d0c1 | 615 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
616 | if (err) |
617 | break; | |
618 | ||
bf07803a | 619 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
620 | if (err) |
621 | err = -EFAULT; | |
622 | ||
623 | break; | |
624 | } | |
625 | ||
626 | /* Remove volume command */ | |
627 | case UBI_IOCRMVOL: | |
628 | { | |
629 | int vol_id; | |
630 | ||
631 | dbg_msg("remove volume"); | |
bf07803a | 632 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
633 | if (err) { |
634 | err = -EFAULT; | |
635 | break; | |
636 | } | |
637 | ||
638 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
639 | if (IS_ERR(desc)) { | |
640 | err = PTR_ERR(desc); | |
641 | break; | |
642 | } | |
643 | ||
40e4d0c1 | 644 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 645 | err = ubi_remove_volume(desc); |
40e4d0c1 AB |
646 | mutex_unlock(&ubi->volumes_mutex); |
647 | ||
450f872a | 648 | /* |
40e4d0c1 AB |
649 | * The volume is deleted (unless an error occurred), and the |
650 | * 'struct ubi_volume' object will be freed when | |
651 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
652 | */ |
653 | ubi_close_volume(desc); | |
801c135c AB |
654 | break; |
655 | } | |
656 | ||
657 | /* Re-size volume command */ | |
658 | case UBI_IOCRSVOL: | |
659 | { | |
660 | int pebs; | |
661 | uint64_t tmp; | |
662 | struct ubi_rsvol_req req; | |
663 | ||
664 | dbg_msg("re-size volume"); | |
bf07803a | 665 | err = copy_from_user(&req, argp, |
801c135c AB |
666 | sizeof(struct ubi_rsvol_req)); |
667 | if (err) { | |
668 | err = -EFAULT; | |
669 | break; | |
670 | } | |
671 | ||
672 | err = verify_rsvol_req(ubi, &req); | |
673 | if (err) | |
674 | break; | |
675 | ||
676 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
677 | if (IS_ERR(desc)) { | |
678 | err = PTR_ERR(desc); | |
679 | break; | |
680 | } | |
681 | ||
682 | tmp = req.bytes; | |
683 | pebs = !!do_div(tmp, desc->vol->usable_leb_size); | |
684 | pebs += tmp; | |
685 | ||
40e4d0c1 | 686 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 687 | err = ubi_resize_volume(desc, pebs); |
40e4d0c1 | 688 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
689 | ubi_close_volume(desc); |
690 | break; | |
691 | } | |
692 | ||
693 | default: | |
694 | err = -ENOTTY; | |
695 | break; | |
696 | } | |
697 | ||
698 | return err; | |
699 | } | |
700 | ||
9f961b57 AB |
701 | /* UBI control character device operations */ |
702 | struct file_operations ubi_ctrl_cdev_operations = { | |
703 | .owner = THIS_MODULE, | |
704 | }; | |
705 | ||
801c135c AB |
706 | /* UBI character device operations */ |
707 | struct file_operations ubi_cdev_operations = { | |
708 | .owner = THIS_MODULE, | |
709 | .ioctl = ubi_cdev_ioctl, | |
f800f09b | 710 | .llseek = no_llseek, |
801c135c AB |
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, | |
f800f09b | 721 | .ioctl = vol_cdev_ioctl, |
801c135c | 722 | }; |