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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
801c135c AB |
2 | /* |
3 | * Copyright (c) International Business Machines Corp., 2006 | |
4 | * | |
801c135c AB |
5 | * Author: Artem Bityutskiy (Битюцкий Артём) |
6 | */ | |
7 | ||
8 | /* | |
9 | * This file includes implementation of UBI character device operations. | |
10 | * | |
11 | * There are two kinds of character devices in UBI: UBI character devices and | |
12 | * UBI volume character devices. UBI character devices allow users to | |
13 | * manipulate whole volumes: create, remove, and re-size them. Volume character | |
14 | * devices provide volume I/O capabilities. | |
15 | * | |
16 | * Major and minor numbers are assigned dynamically to both UBI and volume | |
17 | * character devices. | |
9f961b57 AB |
18 | * |
19 | * Well, there is the third kind of character devices - the UBI control | |
20 | * character device, which allows to manipulate by UBI devices - create and | |
21 | * delete them. In other words, it is used for attaching and detaching MTD | |
22 | * devices. | |
801c135c AB |
23 | */ |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/stat.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
801c135c AB |
28 | #include <linux/ioctl.h> |
29 | #include <linux/capability.h> | |
9c9ec147 | 30 | #include <linux/uaccess.h> |
f429b2ea | 31 | #include <linux/compat.h> |
3013ee31 | 32 | #include <linux/math64.h> |
801c135c | 33 | #include <mtd/ubi-user.h> |
801c135c AB |
34 | #include "ubi.h" |
35 | ||
801c135c AB |
36 | /** |
37 | * get_exclusive - get exclusive access to an UBI volume. | |
38 | * @desc: volume descriptor | |
39 | * | |
40 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
41 | * mode value (positive integer) in case of success and a negative error code | |
42 | * in case of failure. | |
43 | */ | |
45fc5c81 | 44 | static int get_exclusive(struct ubi_volume_desc *desc) |
801c135c AB |
45 | { |
46 | int users, err; | |
47 | struct ubi_volume *vol = desc->vol; | |
48 | ||
49 | spin_lock(&vol->ubi->volumes_lock); | |
fafdd2bf | 50 | users = vol->readers + vol->writers + vol->exclusive + vol->metaonly; |
801c135c AB |
51 | ubi_assert(users > 0); |
52 | if (users > 1) { | |
45fc5c81 | 53 | ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id); |
801c135c AB |
54 | err = -EBUSY; |
55 | } else { | |
fafdd2bf | 56 | vol->readers = vol->writers = vol->metaonly = 0; |
801c135c AB |
57 | vol->exclusive = 1; |
58 | err = desc->mode; | |
59 | desc->mode = UBI_EXCLUSIVE; | |
60 | } | |
61 | spin_unlock(&vol->ubi->volumes_lock); | |
62 | ||
63 | return err; | |
64 | } | |
65 | ||
66 | /** | |
67 | * revoke_exclusive - revoke exclusive mode. | |
68 | * @desc: volume descriptor | |
69 | * @mode: new mode to switch to | |
70 | */ | |
71 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
72 | { | |
73 | struct ubi_volume *vol = desc->vol; | |
74 | ||
75 | spin_lock(&vol->ubi->volumes_lock); | |
fafdd2bf | 76 | ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0); |
801c135c AB |
77 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); |
78 | vol->exclusive = 0; | |
79 | if (mode == UBI_READONLY) | |
80 | vol->readers = 1; | |
81 | else if (mode == UBI_READWRITE) | |
82 | vol->writers = 1; | |
fafdd2bf RW |
83 | else if (mode == UBI_METAONLY) |
84 | vol->metaonly = 1; | |
801c135c AB |
85 | else |
86 | vol->exclusive = 1; | |
87 | spin_unlock(&vol->ubi->volumes_lock); | |
88 | ||
89 | desc->mode = mode; | |
90 | } | |
91 | ||
92 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
93 | { | |
94 | struct ubi_volume_desc *desc; | |
e73f4459 AB |
95 | int vol_id = iminor(inode) - 1, mode, ubi_num; |
96 | ||
97 | ubi_num = ubi_major2num(imajor(inode)); | |
7d200e88 | 98 | if (ubi_num < 0) |
e73f4459 | 99 | return ubi_num; |
801c135c AB |
100 | |
101 | if (file->f_mode & FMODE_WRITE) | |
102 | mode = UBI_READWRITE; | |
103 | else | |
104 | mode = UBI_READONLY; | |
105 | ||
e1cf7e6d | 106 | dbg_gen("open device %d, volume %d, mode %d", |
feddbb34 | 107 | ubi_num, vol_id, mode); |
801c135c | 108 | |
e73f4459 | 109 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
801c135c AB |
110 | if (IS_ERR(desc)) |
111 | return PTR_ERR(desc); | |
112 | ||
113 | file->private_data = desc; | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
118 | { | |
119 | struct ubi_volume_desc *desc = file->private_data; | |
120 | struct ubi_volume *vol = desc->vol; | |
121 | ||
e1cf7e6d AB |
122 | dbg_gen("release device %d, volume %d, mode %d", |
123 | vol->ubi->ubi_num, vol->vol_id, desc->mode); | |
801c135c AB |
124 | |
125 | if (vol->updating) { | |
32608703 | 126 | ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged", |
801c135c | 127 | vol->vol_id); |
e653879c | 128 | ubi_assert(!vol->changing_leb); |
801c135c | 129 | vol->updating = 0; |
92ad8f37 | 130 | vfree(vol->upd_buf); |
e653879c | 131 | } else if (vol->changing_leb) { |
049333ce AB |
132 | dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", |
133 | vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, | |
134 | vol->vol_id); | |
e653879c AB |
135 | vol->changing_leb = 0; |
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; | |
801c135c AB |
147 | |
148 | if (vol->updating) { | |
feddbb34 | 149 | /* Update is in progress, seeking is prohibited */ |
32608703 | 150 | ubi_err(vol->ubi, "updating"); |
801c135c AB |
151 | return -EBUSY; |
152 | } | |
153 | ||
4a1f2f38 | 154 | return fixed_size_llseek(file, offset, origin, vol->used_bytes); |
801c135c AB |
155 | } |
156 | ||
049333ce AB |
157 | static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, |
158 | int datasync) | |
1b24bc3a CC |
159 | { |
160 | struct ubi_volume_desc *desc = file->private_data; | |
161 | struct ubi_device *ubi = desc->vol->ubi; | |
496ad9aa | 162 | struct inode *inode = file_inode(file); |
02c24a82 | 163 | int err; |
5955102c | 164 | inode_lock(inode); |
02c24a82 | 165 | err = ubi_sync(ubi->ubi_num); |
5955102c | 166 | inode_unlock(inode); |
02c24a82 | 167 | return err; |
1b24bc3a CC |
168 | } |
169 | ||
170 | ||
801c135c AB |
171 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, |
172 | loff_t *offp) | |
173 | { | |
174 | struct ubi_volume_desc *desc = file->private_data; | |
175 | struct ubi_volume *vol = desc->vol; | |
176 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 177 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
178 | size_t count_save = count; |
179 | void *tbuf; | |
801c135c | 180 | |
c8566350 | 181 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 182 | count, *offp, vol->vol_id); |
801c135c AB |
183 | |
184 | if (vol->updating) { | |
32608703 | 185 | ubi_err(vol->ubi, "updating"); |
801c135c AB |
186 | return -EBUSY; |
187 | } | |
188 | if (vol->upd_marker) { | |
32608703 | 189 | ubi_err(vol->ubi, "damaged volume, update marker is set"); |
801c135c AB |
190 | return -EBADF; |
191 | } | |
192 | if (*offp == vol->used_bytes || count == 0) | |
193 | return 0; | |
194 | ||
195 | if (vol->corrupted) | |
c8566350 | 196 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
197 | |
198 | if (*offp + count > vol->used_bytes) | |
199 | count_save = count = vol->used_bytes - *offp; | |
200 | ||
201 | tbuf_size = vol->usable_leb_size; | |
202 | if (count < tbuf_size) | |
203 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 204 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
205 | if (!tbuf) |
206 | return -ENOMEM; | |
207 | ||
208 | len = count > tbuf_size ? tbuf_size : count; | |
3013ee31 | 209 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
801c135c AB |
210 | |
211 | do { | |
212 | cond_resched(); | |
213 | ||
214 | if (off + len >= vol->usable_leb_size) | |
215 | len = vol->usable_leb_size - off; | |
216 | ||
89b96b69 | 217 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
218 | if (err) |
219 | break; | |
220 | ||
221 | off += len; | |
222 | if (off == vol->usable_leb_size) { | |
223 | lnum += 1; | |
224 | off -= vol->usable_leb_size; | |
225 | } | |
226 | ||
227 | count -= len; | |
228 | *offp += len; | |
229 | ||
230 | err = copy_to_user(buf, tbuf, len); | |
231 | if (err) { | |
232 | err = -EFAULT; | |
233 | break; | |
234 | } | |
235 | ||
236 | buf += len; | |
237 | len = count > tbuf_size ? tbuf_size : count; | |
238 | } while (count); | |
239 | ||
92ad8f37 | 240 | vfree(tbuf); |
801c135c AB |
241 | return err ? err : count_save - count; |
242 | } | |
243 | ||
801c135c AB |
244 | /* |
245 | * This function allows to directly write to dynamic UBI volumes, without | |
766fb95b | 246 | * issuing the volume update operation. |
801c135c AB |
247 | */ |
248 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
249 | size_t count, loff_t *offp) | |
250 | { | |
251 | struct ubi_volume_desc *desc = file->private_data; | |
252 | struct ubi_volume *vol = desc->vol; | |
253 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 254 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
255 | size_t count_save = count; |
256 | char *tbuf; | |
801c135c | 257 | |
766fb95b SA |
258 | if (!vol->direct_writes) |
259 | return -EPERM; | |
260 | ||
c8566350 | 261 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 262 | count, *offp, vol->vol_id); |
801c135c AB |
263 | |
264 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
265 | return -EROFS; | |
266 | ||
3013ee31 | 267 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
cadb40cc | 268 | if (off & (ubi->min_io_size - 1)) { |
32608703 | 269 | ubi_err(ubi, "unaligned position"); |
801c135c AB |
270 | return -EINVAL; |
271 | } | |
272 | ||
273 | if (*offp + count > vol->used_bytes) | |
274 | count_save = count = vol->used_bytes - *offp; | |
275 | ||
276 | /* We can write only in fractions of the minimum I/O unit */ | |
cadb40cc | 277 | if (count & (ubi->min_io_size - 1)) { |
32608703 | 278 | ubi_err(ubi, "unaligned write length"); |
801c135c AB |
279 | return -EINVAL; |
280 | } | |
281 | ||
282 | tbuf_size = vol->usable_leb_size; | |
283 | if (count < tbuf_size) | |
284 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 285 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
286 | if (!tbuf) |
287 | return -ENOMEM; | |
288 | ||
289 | len = count > tbuf_size ? tbuf_size : count; | |
290 | ||
291 | while (count) { | |
292 | cond_resched(); | |
293 | ||
294 | if (off + len >= vol->usable_leb_size) | |
295 | len = vol->usable_leb_size - off; | |
296 | ||
297 | err = copy_from_user(tbuf, buf, len); | |
298 | if (err) { | |
299 | err = -EFAULT; | |
300 | break; | |
301 | } | |
302 | ||
b36a261e | 303 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len); |
801c135c AB |
304 | if (err) |
305 | break; | |
306 | ||
307 | off += len; | |
308 | if (off == vol->usable_leb_size) { | |
309 | lnum += 1; | |
310 | off -= vol->usable_leb_size; | |
311 | } | |
312 | ||
313 | count -= len; | |
314 | *offp += len; | |
315 | buf += len; | |
316 | len = count > tbuf_size ? tbuf_size : count; | |
317 | } | |
318 | ||
92ad8f37 | 319 | vfree(tbuf); |
801c135c AB |
320 | return err ? err : count_save - count; |
321 | } | |
322 | ||
801c135c AB |
323 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, |
324 | size_t count, loff_t *offp) | |
325 | { | |
326 | int err = 0; | |
327 | struct ubi_volume_desc *desc = file->private_data; | |
328 | struct ubi_volume *vol = desc->vol; | |
329 | struct ubi_device *ubi = vol->ubi; | |
330 | ||
e653879c | 331 | if (!vol->updating && !vol->changing_leb) |
801c135c AB |
332 | return vol_cdev_direct_write(file, buf, count, offp); |
333 | ||
e653879c AB |
334 | if (vol->updating) |
335 | err = ubi_more_update_data(ubi, vol, buf, count); | |
336 | else | |
337 | err = ubi_more_leb_change_data(ubi, vol, buf, count); | |
338 | ||
801c135c | 339 | if (err < 0) { |
32608703 | 340 | ubi_err(ubi, "cannot accept more %zd bytes of data, error %d", |
01f7b309 | 341 | count, err); |
801c135c AB |
342 | return err; |
343 | } | |
344 | ||
345 | if (err) { | |
346 | /* | |
e653879c AB |
347 | * The operation is finished, @err contains number of actually |
348 | * written bytes. | |
801c135c AB |
349 | */ |
350 | count = err; | |
351 | ||
e653879c AB |
352 | if (vol->changing_leb) { |
353 | revoke_exclusive(desc, UBI_READWRITE); | |
354 | return count; | |
355 | } | |
356 | ||
c355aa46 QS |
357 | /* |
358 | * We voluntarily do not take into account the skip_check flag | |
359 | * as we want to make sure what we wrote was correctly written. | |
360 | */ | |
801c135c AB |
361 | err = ubi_check_volume(ubi, vol->vol_id); |
362 | if (err < 0) | |
363 | return err; | |
364 | ||
365 | if (err) { | |
32608703 | 366 | ubi_warn(ubi, "volume %d on UBI device %d is corrupted", |
801c135c AB |
367 | vol->vol_id, ubi->ubi_num); |
368 | vol->corrupted = 1; | |
369 | } | |
370 | vol->checked = 1; | |
0e0ee1cc | 371 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
801c135c AB |
372 | revoke_exclusive(desc, UBI_READWRITE); |
373 | } | |
374 | ||
801c135c AB |
375 | return count; |
376 | } | |
377 | ||
f429b2ea AB |
378 | static long vol_cdev_ioctl(struct file *file, unsigned int cmd, |
379 | unsigned long arg) | |
801c135c AB |
380 | { |
381 | int err = 0; | |
382 | struct ubi_volume_desc *desc = file->private_data; | |
383 | struct ubi_volume *vol = desc->vol; | |
384 | struct ubi_device *ubi = vol->ubi; | |
385 | void __user *argp = (void __user *)arg; | |
386 | ||
801c135c | 387 | switch (cmd) { |
801c135c AB |
388 | /* Volume update command */ |
389 | case UBI_IOCVOLUP: | |
390 | { | |
391 | int64_t bytes, rsvd_bytes; | |
392 | ||
393 | if (!capable(CAP_SYS_RESOURCE)) { | |
394 | err = -EPERM; | |
395 | break; | |
396 | } | |
397 | ||
398 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
399 | if (err) { | |
400 | err = -EFAULT; | |
401 | break; | |
402 | } | |
403 | ||
404 | if (desc->mode == UBI_READONLY) { | |
405 | err = -EROFS; | |
406 | break; | |
407 | } | |
408 | ||
73789a3d | 409 | rsvd_bytes = (long long)vol->reserved_pebs * |
5f09aaa9 | 410 | vol->usable_leb_size; |
801c135c AB |
411 | if (bytes < 0 || bytes > rsvd_bytes) { |
412 | err = -EINVAL; | |
413 | break; | |
414 | } | |
415 | ||
45fc5c81 | 416 | err = get_exclusive(desc); |
801c135c AB |
417 | if (err < 0) |
418 | break; | |
419 | ||
1b68d0ee | 420 | err = ubi_start_update(ubi, vol, bytes); |
fda322a1 EG |
421 | if (bytes == 0) { |
422 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); | |
801c135c | 423 | revoke_exclusive(desc, UBI_READWRITE); |
fda322a1 | 424 | } |
801c135c AB |
425 | break; |
426 | } | |
427 | ||
e653879c AB |
428 | /* Atomic logical eraseblock change command */ |
429 | case UBI_IOCEBCH: | |
430 | { | |
431 | struct ubi_leb_change_req req; | |
432 | ||
433 | err = copy_from_user(&req, argp, | |
434 | sizeof(struct ubi_leb_change_req)); | |
435 | if (err) { | |
436 | err = -EFAULT; | |
437 | break; | |
438 | } | |
439 | ||
440 | if (desc->mode == UBI_READONLY || | |
441 | vol->vol_type == UBI_STATIC_VOLUME) { | |
442 | err = -EROFS; | |
443 | break; | |
444 | } | |
445 | ||
446 | /* Validate the request */ | |
447 | err = -EINVAL; | |
9a5f09ac | 448 | if (!ubi_leb_valid(vol, req.lnum) || |
299d0c5b | 449 | req.bytes < 0 || req.bytes > vol->usable_leb_size) |
e653879c | 450 | break; |
e653879c | 451 | |
45fc5c81 | 452 | err = get_exclusive(desc); |
e653879c AB |
453 | if (err < 0) |
454 | break; | |
455 | ||
456 | err = ubi_start_leb_change(ubi, vol, &req); | |
457 | if (req.bytes == 0) | |
458 | revoke_exclusive(desc, UBI_READWRITE); | |
459 | break; | |
460 | } | |
461 | ||
801c135c AB |
462 | /* Logical eraseblock erasure command */ |
463 | case UBI_IOCEBER: | |
464 | { | |
465 | int32_t lnum; | |
466 | ||
bf07803a | 467 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
468 | if (err) { |
469 | err = -EFAULT; | |
470 | break; | |
471 | } | |
472 | ||
e653879c AB |
473 | if (desc->mode == UBI_READONLY || |
474 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
475 | err = -EROFS; |
476 | break; | |
477 | } | |
478 | ||
9a5f09ac | 479 | if (!ubi_leb_valid(vol, lnum)) { |
801c135c AB |
480 | err = -EINVAL; |
481 | break; | |
482 | } | |
483 | ||
c8566350 | 484 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 485 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
486 | if (err) |
487 | break; | |
488 | ||
62f38455 | 489 | err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); |
801c135c AB |
490 | break; |
491 | } | |
141e6ebd CC |
492 | |
493 | /* Logical eraseblock map command */ | |
494 | case UBI_IOCEBMAP: | |
495 | { | |
496 | struct ubi_map_req req; | |
497 | ||
498 | err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); | |
499 | if (err) { | |
500 | err = -EFAULT; | |
501 | break; | |
502 | } | |
b36a261e | 503 | err = ubi_leb_map(desc, req.lnum); |
141e6ebd CC |
504 | break; |
505 | } | |
c3da23be CC |
506 | |
507 | /* Logical eraseblock un-map command */ | |
508 | case UBI_IOCEBUNMAP: | |
509 | { | |
510 | int32_t lnum; | |
511 | ||
512 | err = get_user(lnum, (__user int32_t *)argp); | |
513 | if (err) { | |
514 | err = -EFAULT; | |
515 | break; | |
516 | } | |
517 | err = ubi_leb_unmap(desc, lnum); | |
518 | break; | |
519 | } | |
a27ce8f5 CC |
520 | |
521 | /* Check if logical eraseblock is mapped command */ | |
522 | case UBI_IOCEBISMAP: | |
523 | { | |
524 | int32_t lnum; | |
525 | ||
526 | err = get_user(lnum, (__user int32_t *)argp); | |
527 | if (err) { | |
528 | err = -EFAULT; | |
529 | break; | |
530 | } | |
531 | err = ubi_is_mapped(desc, lnum); | |
532 | break; | |
533 | } | |
801c135c | 534 | |
f089c0b2 | 535 | /* Set volume property command */ |
6748482f | 536 | case UBI_IOCSETVOLPROP: |
766fb95b | 537 | { |
6748482f | 538 | struct ubi_set_vol_prop_req req; |
766fb95b SA |
539 | |
540 | err = copy_from_user(&req, argp, | |
6748482f | 541 | sizeof(struct ubi_set_vol_prop_req)); |
766fb95b SA |
542 | if (err) { |
543 | err = -EFAULT; | |
544 | break; | |
545 | } | |
546 | switch (req.property) { | |
6748482f | 547 | case UBI_VOL_PROP_DIRECT_WRITE: |
f089c0b2 | 548 | mutex_lock(&ubi->device_mutex); |
766fb95b | 549 | desc->vol->direct_writes = !!req.value; |
f089c0b2 | 550 | mutex_unlock(&ubi->device_mutex); |
766fb95b SA |
551 | break; |
552 | default: | |
553 | err = -EINVAL; | |
554 | break; | |
555 | } | |
556 | break; | |
557 | } | |
558 | ||
8af87188 AB |
559 | /* Create a R/O block device on top of the UBI volume */ |
560 | case UBI_IOCVOLCRBLK: | |
9d54c8a3 EG |
561 | { |
562 | struct ubi_volume_info vi; | |
563 | ||
564 | ubi_get_volume_info(desc, &vi); | |
4d283ee2 | 565 | err = ubiblock_create(&vi); |
9d54c8a3 EG |
566 | break; |
567 | } | |
568 | ||
8af87188 AB |
569 | /* Remove the R/O block device */ |
570 | case UBI_IOCVOLRMBLK: | |
9d54c8a3 EG |
571 | { |
572 | struct ubi_volume_info vi; | |
573 | ||
574 | ubi_get_volume_info(desc, &vi); | |
4d283ee2 | 575 | err = ubiblock_remove(&vi); |
9d54c8a3 EG |
576 | break; |
577 | } | |
578 | ||
801c135c AB |
579 | default: |
580 | err = -ENOTTY; | |
581 | break; | |
582 | } | |
801c135c AB |
583 | return err; |
584 | } | |
585 | ||
586 | /** | |
587 | * verify_mkvol_req - verify volume creation request. | |
588 | * @ubi: UBI device description object | |
589 | * @req: the request to check | |
590 | * | |
591 | * This function zero if the request is correct, and %-EINVAL if not. | |
592 | */ | |
593 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
594 | const struct ubi_mkvol_req *req) | |
595 | { | |
596 | int n, err = -EINVAL; | |
597 | ||
598 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
599 | req->name_len < 0) | |
600 | goto bad; | |
601 | ||
602 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
603 | req->vol_id != UBI_VOL_NUM_AUTO) | |
604 | goto bad; | |
605 | ||
606 | if (req->alignment == 0) | |
607 | goto bad; | |
608 | ||
609 | if (req->bytes == 0) | |
610 | goto bad; | |
611 | ||
612 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
613 | req->vol_type != UBI_STATIC_VOLUME) | |
614 | goto bad; | |
615 | ||
c355aa46 QS |
616 | if (req->flags & ~UBI_VOL_VALID_FLGS) |
617 | goto bad; | |
618 | ||
619 | if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG && | |
620 | req->vol_type != UBI_STATIC_VOLUME) | |
621 | goto bad; | |
622 | ||
801c135c AB |
623 | if (req->alignment > ubi->leb_size) |
624 | goto bad; | |
625 | ||
cadb40cc | 626 | n = req->alignment & (ubi->min_io_size - 1); |
801c135c AB |
627 | if (req->alignment != 1 && n) |
628 | goto bad; | |
629 | ||
4a59c797 RW |
630 | if (!req->name[0] || !req->name_len) |
631 | goto bad; | |
632 | ||
801c135c AB |
633 | if (req->name_len > UBI_VOL_NAME_MAX) { |
634 | err = -ENAMETOOLONG; | |
635 | goto bad; | |
636 | } | |
637 | ||
a6ea4407 AB |
638 | n = strnlen(req->name, req->name_len + 1); |
639 | if (n != req->name_len) | |
640 | goto bad; | |
641 | ||
801c135c AB |
642 | return 0; |
643 | ||
644 | bad: | |
32608703 | 645 | ubi_err(ubi, "bad volume creation request"); |
718c00bb | 646 | ubi_dump_mkvol_req(req); |
801c135c AB |
647 | return err; |
648 | } | |
649 | ||
650 | /** | |
651 | * verify_rsvol_req - verify volume re-size request. | |
652 | * @ubi: UBI device description object | |
653 | * @req: the request to check | |
654 | * | |
655 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
656 | */ | |
657 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
658 | const struct ubi_rsvol_req *req) | |
659 | { | |
660 | if (req->bytes <= 0) | |
661 | return -EINVAL; | |
662 | ||
663 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
664 | return -EINVAL; | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
f40ac9cd AB |
669 | /** |
670 | * rename_volumes - rename UBI volumes. | |
671 | * @ubi: UBI device description object | |
672 | * @req: volumes re-name request | |
673 | * | |
674 | * This is a helper function for the volume re-name IOCTL which validates the | |
675 | * the request, opens the volume and calls corresponding volumes management | |
676 | * function. Returns zero in case of success and a negative error code in case | |
677 | * of failure. | |
678 | */ | |
679 | static int rename_volumes(struct ubi_device *ubi, | |
680 | struct ubi_rnvol_req *req) | |
681 | { | |
682 | int i, n, err; | |
683 | struct list_head rename_list; | |
684 | struct ubi_rename_entry *re, *re1; | |
685 | ||
686 | if (req->count < 0 || req->count > UBI_MAX_RNVOL) | |
687 | return -EINVAL; | |
688 | ||
689 | if (req->count == 0) | |
690 | return 0; | |
691 | ||
692 | /* Validate volume IDs and names in the request */ | |
693 | for (i = 0; i < req->count; i++) { | |
694 | if (req->ents[i].vol_id < 0 || | |
695 | req->ents[i].vol_id >= ubi->vtbl_slots) | |
696 | return -EINVAL; | |
697 | if (req->ents[i].name_len < 0) | |
698 | return -EINVAL; | |
699 | if (req->ents[i].name_len > UBI_VOL_NAME_MAX) | |
700 | return -ENAMETOOLONG; | |
701 | req->ents[i].name[req->ents[i].name_len] = '\0'; | |
702 | n = strlen(req->ents[i].name); | |
703 | if (n != req->ents[i].name_len) | |
7fbbd057 | 704 | return -EINVAL; |
f40ac9cd AB |
705 | } |
706 | ||
707 | /* Make sure volume IDs and names are unique */ | |
708 | for (i = 0; i < req->count - 1; i++) { | |
709 | for (n = i + 1; n < req->count; n++) { | |
710 | if (req->ents[i].vol_id == req->ents[n].vol_id) { | |
32608703 | 711 | ubi_err(ubi, "duplicated volume id %d", |
f40ac9cd AB |
712 | req->ents[i].vol_id); |
713 | return -EINVAL; | |
714 | } | |
715 | if (!strcmp(req->ents[i].name, req->ents[n].name)) { | |
32608703 | 716 | ubi_err(ubi, "duplicated volume name \"%s\"", |
f40ac9cd AB |
717 | req->ents[i].name); |
718 | return -EINVAL; | |
719 | } | |
720 | } | |
721 | } | |
722 | ||
723 | /* Create the re-name list */ | |
724 | INIT_LIST_HEAD(&rename_list); | |
725 | for (i = 0; i < req->count; i++) { | |
726 | int vol_id = req->ents[i].vol_id; | |
727 | int name_len = req->ents[i].name_len; | |
728 | const char *name = req->ents[i].name; | |
729 | ||
730 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
731 | if (!re) { | |
732 | err = -ENOMEM; | |
733 | goto out_free; | |
734 | } | |
735 | ||
892abde5 | 736 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY); |
f40ac9cd AB |
737 | if (IS_ERR(re->desc)) { |
738 | err = PTR_ERR(re->desc); | |
32608703 TB |
739 | ubi_err(ubi, "cannot open volume %d, error %d", |
740 | vol_id, err); | |
f40ac9cd AB |
741 | kfree(re); |
742 | goto out_free; | |
743 | } | |
744 | ||
745 | /* Skip this re-naming if the name does not really change */ | |
746 | if (re->desc->vol->name_len == name_len && | |
747 | !memcmp(re->desc->vol->name, name, name_len)) { | |
748 | ubi_close_volume(re->desc); | |
749 | kfree(re); | |
750 | continue; | |
751 | } | |
752 | ||
753 | re->new_name_len = name_len; | |
754 | memcpy(re->new_name, name, name_len); | |
755 | list_add_tail(&re->list, &rename_list); | |
719bb840 | 756 | dbg_gen("will rename volume %d from \"%s\" to \"%s\"", |
f40ac9cd AB |
757 | vol_id, re->desc->vol->name, name); |
758 | } | |
759 | ||
760 | if (list_empty(&rename_list)) | |
761 | return 0; | |
762 | ||
763 | /* Find out the volumes which have to be removed */ | |
764 | list_for_each_entry(re, &rename_list, list) { | |
765 | struct ubi_volume_desc *desc; | |
766 | int no_remove_needed = 0; | |
767 | ||
768 | /* | |
769 | * Volume @re->vol_id is going to be re-named to | |
770 | * @re->new_name, while its current name is @name. If a volume | |
771 | * with name @re->new_name currently exists, it has to be | |
772 | * removed, unless it is also re-named in the request (@req). | |
773 | */ | |
774 | list_for_each_entry(re1, &rename_list, list) { | |
775 | if (re->new_name_len == re1->desc->vol->name_len && | |
776 | !memcmp(re->new_name, re1->desc->vol->name, | |
777 | re1->desc->vol->name_len)) { | |
778 | no_remove_needed = 1; | |
779 | break; | |
780 | } | |
781 | } | |
782 | ||
783 | if (no_remove_needed) | |
784 | continue; | |
785 | ||
786 | /* | |
787 | * It seems we need to remove volume with name @re->new_name, | |
788 | * if it exists. | |
789 | */ | |
f2863c54 AB |
790 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, |
791 | UBI_EXCLUSIVE); | |
f40ac9cd AB |
792 | if (IS_ERR(desc)) { |
793 | err = PTR_ERR(desc); | |
794 | if (err == -ENODEV) | |
795 | /* Re-naming into a non-existing volume name */ | |
796 | continue; | |
797 | ||
798 | /* The volume exists but busy, or an error occurred */ | |
32608703 | 799 | ubi_err(ubi, "cannot open volume \"%s\", error %d", |
f40ac9cd AB |
800 | re->new_name, err); |
801 | goto out_free; | |
802 | } | |
803 | ||
01ebc12f JL |
804 | re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
805 | if (!re1) { | |
f40ac9cd AB |
806 | err = -ENOMEM; |
807 | ubi_close_volume(desc); | |
808 | goto out_free; | |
809 | } | |
810 | ||
01ebc12f JL |
811 | re1->remove = 1; |
812 | re1->desc = desc; | |
813 | list_add(&re1->list, &rename_list); | |
719bb840 | 814 | dbg_gen("will remove volume %d, name \"%s\"", |
01ebc12f | 815 | re1->desc->vol->vol_id, re1->desc->vol->name); |
f40ac9cd AB |
816 | } |
817 | ||
f089c0b2 | 818 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 819 | err = ubi_rename_volumes(ubi, &rename_list); |
f089c0b2 | 820 | mutex_unlock(&ubi->device_mutex); |
f40ac9cd AB |
821 | |
822 | out_free: | |
823 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
824 | ubi_close_volume(re->desc); | |
825 | list_del(&re->list); | |
826 | kfree(re); | |
827 | } | |
828 | return err; | |
829 | } | |
830 | ||
f429b2ea AB |
831 | static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, |
832 | unsigned long arg) | |
801c135c AB |
833 | { |
834 | int err = 0; | |
835 | struct ubi_device *ubi; | |
836 | struct ubi_volume_desc *desc; | |
837 | void __user *argp = (void __user *)arg; | |
838 | ||
801c135c AB |
839 | if (!capable(CAP_SYS_RESOURCE)) |
840 | return -EPERM; | |
841 | ||
f429b2ea | 842 | ubi = ubi_get_by_major(imajor(file->f_mapping->host)); |
e73f4459 AB |
843 | if (!ubi) |
844 | return -ENODEV; | |
801c135c AB |
845 | |
846 | switch (cmd) { | |
847 | /* Create volume command */ | |
848 | case UBI_IOCMKVOL: | |
849 | { | |
850 | struct ubi_mkvol_req req; | |
851 | ||
c8566350 | 852 | dbg_gen("create volume"); |
897a316c | 853 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
854 | if (err) { |
855 | err = -EFAULT; | |
856 | break; | |
857 | } | |
858 | ||
859 | err = verify_mkvol_req(ubi, &req); | |
860 | if (err) | |
861 | break; | |
862 | ||
f089c0b2 | 863 | mutex_lock(&ubi->device_mutex); |
801c135c | 864 | err = ubi_create_volume(ubi, &req); |
f089c0b2 | 865 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
866 | if (err) |
867 | break; | |
868 | ||
bf07803a | 869 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
870 | if (err) |
871 | err = -EFAULT; | |
872 | ||
873 | break; | |
874 | } | |
875 | ||
876 | /* Remove volume command */ | |
877 | case UBI_IOCRMVOL: | |
878 | { | |
879 | int vol_id; | |
880 | ||
c8566350 | 881 | dbg_gen("remove volume"); |
bf07803a | 882 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
883 | if (err) { |
884 | err = -EFAULT; | |
885 | break; | |
886 | } | |
887 | ||
888 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
889 | if (IS_ERR(desc)) { | |
890 | err = PTR_ERR(desc); | |
891 | break; | |
892 | } | |
893 | ||
f089c0b2 | 894 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 895 | err = ubi_remove_volume(desc, 0); |
f089c0b2 | 896 | mutex_unlock(&ubi->device_mutex); |
40e4d0c1 | 897 | |
450f872a | 898 | /* |
40e4d0c1 AB |
899 | * The volume is deleted (unless an error occurred), and the |
900 | * 'struct ubi_volume' object will be freed when | |
901 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
902 | */ |
903 | ubi_close_volume(desc); | |
801c135c AB |
904 | break; |
905 | } | |
906 | ||
907 | /* Re-size volume command */ | |
908 | case UBI_IOCRSVOL: | |
909 | { | |
910 | int pebs; | |
801c135c AB |
911 | struct ubi_rsvol_req req; |
912 | ||
c8566350 | 913 | dbg_gen("re-size volume"); |
897a316c | 914 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
915 | if (err) { |
916 | err = -EFAULT; | |
917 | break; | |
918 | } | |
919 | ||
920 | err = verify_rsvol_req(ubi, &req); | |
921 | if (err) | |
922 | break; | |
923 | ||
924 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
925 | if (IS_ERR(desc)) { | |
926 | err = PTR_ERR(desc); | |
927 | break; | |
928 | } | |
929 | ||
3013ee31 AB |
930 | pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, |
931 | desc->vol->usable_leb_size); | |
801c135c | 932 | |
f089c0b2 | 933 | mutex_lock(&ubi->device_mutex); |
801c135c | 934 | err = ubi_resize_volume(desc, pebs); |
f089c0b2 | 935 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
936 | ubi_close_volume(desc); |
937 | break; | |
938 | } | |
939 | ||
f40ac9cd AB |
940 | /* Re-name volumes command */ |
941 | case UBI_IOCRNVOL: | |
942 | { | |
943 | struct ubi_rnvol_req *req; | |
944 | ||
719bb840 | 945 | dbg_gen("re-name volumes"); |
f40ac9cd AB |
946 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); |
947 | if (!req) { | |
948 | err = -ENOMEM; | |
949 | break; | |
a396ce4b | 950 | } |
f40ac9cd AB |
951 | |
952 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
953 | if (err) { | |
954 | err = -EFAULT; | |
955 | kfree(req); | |
956 | break; | |
957 | } | |
958 | ||
f40ac9cd | 959 | err = rename_volumes(ubi, req); |
f40ac9cd AB |
960 | kfree(req); |
961 | break; | |
962 | } | |
963 | ||
663586c0 RW |
964 | /* Check a specific PEB for bitflips and scrub it if needed */ |
965 | case UBI_IOCRPEB: | |
966 | { | |
967 | int pnum; | |
968 | ||
969 | err = get_user(pnum, (__user int32_t *)argp); | |
970 | if (err) { | |
971 | err = -EFAULT; | |
972 | break; | |
973 | } | |
974 | ||
975 | err = ubi_bitflip_check(ubi, pnum, 0); | |
976 | break; | |
977 | } | |
978 | ||
979 | /* Force scrubbing for a specific PEB */ | |
980 | case UBI_IOCSPEB: | |
981 | { | |
982 | int pnum; | |
983 | ||
984 | err = get_user(pnum, (__user int32_t *)argp); | |
985 | if (err) { | |
986 | err = -EFAULT; | |
987 | break; | |
988 | } | |
989 | ||
990 | err = ubi_bitflip_check(ubi, pnum, 1); | |
991 | break; | |
992 | } | |
993 | ||
801c135c AB |
994 | default: |
995 | err = -ENOTTY; | |
996 | break; | |
997 | } | |
998 | ||
e73f4459 | 999 | ubi_put_device(ubi); |
801c135c AB |
1000 | return err; |
1001 | } | |
1002 | ||
f429b2ea AB |
1003 | static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, |
1004 | unsigned long arg) | |
897a316c AB |
1005 | { |
1006 | int err = 0; | |
1007 | void __user *argp = (void __user *)arg; | |
1008 | ||
1009 | if (!capable(CAP_SYS_RESOURCE)) | |
1010 | return -EPERM; | |
1011 | ||
1012 | switch (cmd) { | |
1013 | /* Attach an MTD device command */ | |
1014 | case UBI_IOCATT: | |
1015 | { | |
1016 | struct ubi_attach_req req; | |
1017 | struct mtd_info *mtd; | |
1018 | ||
c8566350 | 1019 | dbg_gen("attach MTD device"); |
897a316c AB |
1020 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
1021 | if (err) { | |
1022 | err = -EFAULT; | |
1023 | break; | |
1024 | } | |
1025 | ||
1026 | if (req.mtd_num < 0 || | |
1027 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
1028 | err = -EINVAL; | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | mtd = get_mtd_device(NULL, req.mtd_num); | |
1033 | if (IS_ERR(mtd)) { | |
1034 | err = PTR_ERR(mtd); | |
1035 | break; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Note, further request verification is done by | |
1040 | * 'ubi_attach_mtd_dev()'. | |
1041 | */ | |
1042 | mutex_lock(&ubi_devices_mutex); | |
256334c3 | 1043 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, |
db7e21c2 | 1044 | req.max_beb_per1024); |
897a316c AB |
1045 | mutex_unlock(&ubi_devices_mutex); |
1046 | if (err < 0) | |
1047 | put_mtd_device(mtd); | |
1048 | else | |
1049 | /* @err contains UBI device number */ | |
1050 | err = put_user(err, (__user int32_t *)argp); | |
1051 | ||
1052 | break; | |
1053 | } | |
1054 | ||
1055 | /* Detach an MTD device command */ | |
1056 | case UBI_IOCDET: | |
1057 | { | |
1058 | int ubi_num; | |
1059 | ||
2ce7be1b | 1060 | dbg_gen("detach MTD device"); |
897a316c AB |
1061 | err = get_user(ubi_num, (__user int32_t *)argp); |
1062 | if (err) { | |
1063 | err = -EFAULT; | |
1064 | break; | |
1065 | } | |
1066 | ||
1067 | mutex_lock(&ubi_devices_mutex); | |
1068 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
1069 | mutex_unlock(&ubi_devices_mutex); | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | default: | |
1074 | err = -ENOTTY; | |
1075 | break; | |
1076 | } | |
1077 | ||
1078 | return err; | |
1079 | } | |
1080 | ||
f429b2ea AB |
1081 | #ifdef CONFIG_COMPAT |
1082 | static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1083 | unsigned long arg) | |
1084 | { | |
1085 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1086 | ||
1087 | return vol_cdev_ioctl(file, cmd, translated_arg); | |
1088 | } | |
1089 | ||
1090 | static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1091 | unsigned long arg) | |
1092 | { | |
1093 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1094 | ||
1095 | return ubi_cdev_ioctl(file, cmd, translated_arg); | |
1096 | } | |
1097 | ||
1098 | static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1099 | unsigned long arg) | |
1100 | { | |
1101 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1102 | ||
1103 | return ctrl_cdev_ioctl(file, cmd, translated_arg); | |
1104 | } | |
1105 | #else | |
1106 | #define vol_cdev_compat_ioctl NULL | |
1107 | #define ubi_cdev_compat_ioctl NULL | |
1108 | #define ctrl_cdev_compat_ioctl NULL | |
1109 | #endif | |
1110 | ||
1111 | /* UBI volume character device operations */ | |
1112 | const struct file_operations ubi_vol_cdev_operations = { | |
1113 | .owner = THIS_MODULE, | |
1114 | .open = vol_cdev_open, | |
1115 | .release = vol_cdev_release, | |
1116 | .llseek = vol_cdev_llseek, | |
1117 | .read = vol_cdev_read, | |
1118 | .write = vol_cdev_write, | |
1b24bc3a | 1119 | .fsync = vol_cdev_fsync, |
f429b2ea AB |
1120 | .unlocked_ioctl = vol_cdev_ioctl, |
1121 | .compat_ioctl = vol_cdev_compat_ioctl, | |
9f961b57 AB |
1122 | }; |
1123 | ||
801c135c | 1124 | /* UBI character device operations */ |
4d187a88 | 1125 | const struct file_operations ubi_cdev_operations = { |
f429b2ea AB |
1126 | .owner = THIS_MODULE, |
1127 | .llseek = no_llseek, | |
1128 | .unlocked_ioctl = ubi_cdev_ioctl, | |
1129 | .compat_ioctl = ubi_cdev_compat_ioctl, | |
801c135c AB |
1130 | }; |
1131 | ||
f429b2ea AB |
1132 | /* UBI control character device operations */ |
1133 | const struct file_operations ubi_ctrl_cdev_operations = { | |
1134 | .owner = THIS_MODULE, | |
1135 | .unlocked_ioctl = ctrl_cdev_ioctl, | |
1136 | .compat_ioctl = ctrl_cdev_compat_ioctl, | |
e10b376e | 1137 | .llseek = no_llseek, |
801c135c | 1138 | }; |