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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> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
801c135c AB |
41 | #include <linux/ioctl.h> |
42 | #include <linux/capability.h> | |
9c9ec147 | 43 | #include <linux/uaccess.h> |
f429b2ea | 44 | #include <linux/compat.h> |
3013ee31 | 45 | #include <linux/math64.h> |
801c135c | 46 | #include <mtd/ubi-user.h> |
801c135c AB |
47 | #include "ubi.h" |
48 | ||
801c135c AB |
49 | /** |
50 | * get_exclusive - get exclusive access to an UBI volume. | |
51 | * @desc: volume descriptor | |
52 | * | |
53 | * This function changes UBI volume open mode to "exclusive". Returns previous | |
54 | * mode value (positive integer) in case of success and a negative error code | |
55 | * in case of failure. | |
56 | */ | |
57 | static int get_exclusive(struct ubi_volume_desc *desc) | |
58 | { | |
59 | int users, err; | |
60 | struct ubi_volume *vol = desc->vol; | |
61 | ||
62 | spin_lock(&vol->ubi->volumes_lock); | |
63 | users = vol->readers + vol->writers + vol->exclusive; | |
64 | ubi_assert(users > 0); | |
65 | if (users > 1) { | |
e2986827 | 66 | ubi_err("%d users for volume %d", users, vol->vol_id); |
801c135c AB |
67 | err = -EBUSY; |
68 | } else { | |
69 | vol->readers = vol->writers = 0; | |
70 | vol->exclusive = 1; | |
71 | err = desc->mode; | |
72 | desc->mode = UBI_EXCLUSIVE; | |
73 | } | |
74 | spin_unlock(&vol->ubi->volumes_lock); | |
75 | ||
76 | return err; | |
77 | } | |
78 | ||
79 | /** | |
80 | * revoke_exclusive - revoke exclusive mode. | |
81 | * @desc: volume descriptor | |
82 | * @mode: new mode to switch to | |
83 | */ | |
84 | static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) | |
85 | { | |
86 | struct ubi_volume *vol = desc->vol; | |
87 | ||
88 | spin_lock(&vol->ubi->volumes_lock); | |
89 | ubi_assert(vol->readers == 0 && vol->writers == 0); | |
90 | ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); | |
91 | vol->exclusive = 0; | |
92 | if (mode == UBI_READONLY) | |
93 | vol->readers = 1; | |
94 | else if (mode == UBI_READWRITE) | |
95 | vol->writers = 1; | |
96 | else | |
97 | vol->exclusive = 1; | |
98 | spin_unlock(&vol->ubi->volumes_lock); | |
99 | ||
100 | desc->mode = mode; | |
101 | } | |
102 | ||
103 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
104 | { | |
105 | struct ubi_volume_desc *desc; | |
e73f4459 AB |
106 | int vol_id = iminor(inode) - 1, mode, ubi_num; |
107 | ||
108 | ubi_num = ubi_major2num(imajor(inode)); | |
7d200e88 | 109 | if (ubi_num < 0) |
e73f4459 | 110 | return ubi_num; |
801c135c AB |
111 | |
112 | if (file->f_mode & FMODE_WRITE) | |
113 | mode = UBI_READWRITE; | |
114 | else | |
115 | mode = UBI_READONLY; | |
116 | ||
e1cf7e6d | 117 | dbg_gen("open device %d, volume %d, mode %d", |
feddbb34 | 118 | ubi_num, vol_id, mode); |
801c135c | 119 | |
e73f4459 | 120 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
801c135c AB |
121 | if (IS_ERR(desc)) |
122 | return PTR_ERR(desc); | |
123 | ||
124 | file->private_data = desc; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
129 | { | |
130 | struct ubi_volume_desc *desc = file->private_data; | |
131 | struct ubi_volume *vol = desc->vol; | |
132 | ||
e1cf7e6d AB |
133 | dbg_gen("release device %d, volume %d, mode %d", |
134 | vol->ubi->ubi_num, vol->vol_id, desc->mode); | |
801c135c AB |
135 | |
136 | if (vol->updating) { | |
137 | ubi_warn("update of volume %d not finished, volume is damaged", | |
138 | vol->vol_id); | |
e653879c | 139 | ubi_assert(!vol->changing_leb); |
801c135c | 140 | vol->updating = 0; |
92ad8f37 | 141 | vfree(vol->upd_buf); |
e653879c | 142 | } else if (vol->changing_leb) { |
049333ce AB |
143 | dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", |
144 | vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, | |
145 | vol->vol_id); | |
e653879c AB |
146 | vol->changing_leb = 0; |
147 | vfree(vol->upd_buf); | |
801c135c AB |
148 | } |
149 | ||
150 | ubi_close_volume(desc); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
155 | { | |
156 | struct ubi_volume_desc *desc = file->private_data; | |
157 | struct ubi_volume *vol = desc->vol; | |
158 | loff_t new_offset; | |
159 | ||
160 | if (vol->updating) { | |
feddbb34 | 161 | /* Update is in progress, seeking is prohibited */ |
e2986827 | 162 | ubi_err("updating"); |
801c135c AB |
163 | return -EBUSY; |
164 | } | |
165 | ||
166 | switch (origin) { | |
167 | case 0: /* SEEK_SET */ | |
168 | new_offset = offset; | |
169 | break; | |
170 | case 1: /* SEEK_CUR */ | |
171 | new_offset = file->f_pos + offset; | |
172 | break; | |
173 | case 2: /* SEEK_END */ | |
174 | new_offset = vol->used_bytes + offset; | |
175 | break; | |
176 | default: | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | if (new_offset < 0 || new_offset > vol->used_bytes) { | |
e2986827 | 181 | ubi_err("bad seek %lld", new_offset); |
801c135c AB |
182 | return -EINVAL; |
183 | } | |
184 | ||
c8566350 | 185 | dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld", |
801c135c AB |
186 | vol->vol_id, offset, origin, new_offset); |
187 | ||
188 | file->f_pos = new_offset; | |
189 | return new_offset; | |
190 | } | |
191 | ||
049333ce AB |
192 | static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, |
193 | int datasync) | |
1b24bc3a CC |
194 | { |
195 | struct ubi_volume_desc *desc = file->private_data; | |
196 | struct ubi_device *ubi = desc->vol->ubi; | |
496ad9aa | 197 | struct inode *inode = file_inode(file); |
02c24a82 JB |
198 | int err; |
199 | mutex_lock(&inode->i_mutex); | |
200 | err = ubi_sync(ubi->ubi_num); | |
201 | mutex_unlock(&inode->i_mutex); | |
202 | return err; | |
1b24bc3a CC |
203 | } |
204 | ||
205 | ||
801c135c AB |
206 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, |
207 | loff_t *offp) | |
208 | { | |
209 | struct ubi_volume_desc *desc = file->private_data; | |
210 | struct ubi_volume *vol = desc->vol; | |
211 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 212 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
213 | size_t count_save = count; |
214 | void *tbuf; | |
801c135c | 215 | |
c8566350 | 216 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 217 | count, *offp, vol->vol_id); |
801c135c AB |
218 | |
219 | if (vol->updating) { | |
e2986827 | 220 | ubi_err("updating"); |
801c135c AB |
221 | return -EBUSY; |
222 | } | |
223 | if (vol->upd_marker) { | |
e2986827 | 224 | ubi_err("damaged volume, update marker is set"); |
801c135c AB |
225 | return -EBADF; |
226 | } | |
227 | if (*offp == vol->used_bytes || count == 0) | |
228 | return 0; | |
229 | ||
230 | if (vol->corrupted) | |
c8566350 | 231 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
232 | |
233 | if (*offp + count > vol->used_bytes) | |
234 | count_save = count = vol->used_bytes - *offp; | |
235 | ||
236 | tbuf_size = vol->usable_leb_size; | |
237 | if (count < tbuf_size) | |
238 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 239 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
240 | if (!tbuf) |
241 | return -ENOMEM; | |
242 | ||
243 | len = count > tbuf_size ? tbuf_size : count; | |
3013ee31 | 244 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
801c135c AB |
245 | |
246 | do { | |
247 | cond_resched(); | |
248 | ||
249 | if (off + len >= vol->usable_leb_size) | |
250 | len = vol->usable_leb_size - off; | |
251 | ||
89b96b69 | 252 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
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 | ||
801c135c AB |
279 | /* |
280 | * This function allows to directly write to dynamic UBI volumes, without | |
766fb95b | 281 | * issuing the volume update operation. |
801c135c AB |
282 | */ |
283 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
284 | size_t count, loff_t *offp) | |
285 | { | |
286 | struct ubi_volume_desc *desc = file->private_data; | |
287 | struct ubi_volume *vol = desc->vol; | |
288 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 289 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
290 | size_t count_save = count; |
291 | char *tbuf; | |
801c135c | 292 | |
766fb95b SA |
293 | if (!vol->direct_writes) |
294 | return -EPERM; | |
295 | ||
c8566350 | 296 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 297 | count, *offp, vol->vol_id); |
801c135c AB |
298 | |
299 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
300 | return -EROFS; | |
301 | ||
3013ee31 | 302 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
cadb40cc | 303 | if (off & (ubi->min_io_size - 1)) { |
e2986827 | 304 | ubi_err("unaligned position"); |
801c135c AB |
305 | return -EINVAL; |
306 | } | |
307 | ||
308 | if (*offp + count > vol->used_bytes) | |
309 | count_save = count = vol->used_bytes - *offp; | |
310 | ||
311 | /* We can write only in fractions of the minimum I/O unit */ | |
cadb40cc | 312 | if (count & (ubi->min_io_size - 1)) { |
e2986827 | 313 | ubi_err("unaligned write length"); |
801c135c AB |
314 | return -EINVAL; |
315 | } | |
316 | ||
317 | tbuf_size = vol->usable_leb_size; | |
318 | if (count < tbuf_size) | |
319 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 320 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
321 | if (!tbuf) |
322 | return -ENOMEM; | |
323 | ||
324 | len = count > tbuf_size ? tbuf_size : count; | |
325 | ||
326 | while (count) { | |
327 | cond_resched(); | |
328 | ||
329 | if (off + len >= vol->usable_leb_size) | |
330 | len = vol->usable_leb_size - off; | |
331 | ||
332 | err = copy_from_user(tbuf, buf, len); | |
333 | if (err) { | |
334 | err = -EFAULT; | |
335 | break; | |
336 | } | |
337 | ||
b36a261e | 338 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len); |
801c135c AB |
339 | if (err) |
340 | break; | |
341 | ||
342 | off += len; | |
343 | if (off == vol->usable_leb_size) { | |
344 | lnum += 1; | |
345 | off -= vol->usable_leb_size; | |
346 | } | |
347 | ||
348 | count -= len; | |
349 | *offp += len; | |
350 | buf += len; | |
351 | len = count > tbuf_size ? tbuf_size : count; | |
352 | } | |
353 | ||
92ad8f37 | 354 | vfree(tbuf); |
801c135c AB |
355 | return err ? err : count_save - count; |
356 | } | |
357 | ||
801c135c AB |
358 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, |
359 | size_t count, loff_t *offp) | |
360 | { | |
361 | int err = 0; | |
362 | struct ubi_volume_desc *desc = file->private_data; | |
363 | struct ubi_volume *vol = desc->vol; | |
364 | struct ubi_device *ubi = vol->ubi; | |
365 | ||
e653879c | 366 | if (!vol->updating && !vol->changing_leb) |
801c135c AB |
367 | return vol_cdev_direct_write(file, buf, count, offp); |
368 | ||
e653879c AB |
369 | if (vol->updating) |
370 | err = ubi_more_update_data(ubi, vol, buf, count); | |
371 | else | |
372 | err = ubi_more_leb_change_data(ubi, vol, buf, count); | |
373 | ||
801c135c | 374 | if (err < 0) { |
e653879c | 375 | ubi_err("cannot accept more %zd bytes of data, error %d", |
01f7b309 | 376 | count, err); |
801c135c AB |
377 | return err; |
378 | } | |
379 | ||
380 | if (err) { | |
381 | /* | |
e653879c AB |
382 | * The operation is finished, @err contains number of actually |
383 | * written bytes. | |
801c135c AB |
384 | */ |
385 | count = err; | |
386 | ||
e653879c AB |
387 | if (vol->changing_leb) { |
388 | revoke_exclusive(desc, UBI_READWRITE); | |
389 | return count; | |
390 | } | |
391 | ||
801c135c AB |
392 | err = ubi_check_volume(ubi, vol->vol_id); |
393 | if (err < 0) | |
394 | return err; | |
395 | ||
396 | if (err) { | |
397 | ubi_warn("volume %d on UBI device %d is corrupted", | |
398 | vol->vol_id, ubi->ubi_num); | |
399 | vol->corrupted = 1; | |
400 | } | |
401 | vol->checked = 1; | |
0e0ee1cc | 402 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
801c135c AB |
403 | revoke_exclusive(desc, UBI_READWRITE); |
404 | } | |
405 | ||
801c135c AB |
406 | return count; |
407 | } | |
408 | ||
f429b2ea AB |
409 | static long vol_cdev_ioctl(struct file *file, unsigned int cmd, |
410 | unsigned long arg) | |
801c135c AB |
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 | ||
73789a3d BL |
440 | rsvd_bytes = (long long)vol->reserved_pebs * |
441 | ubi->leb_size-vol->data_pad; | |
801c135c AB |
442 | if (bytes < 0 || bytes > rsvd_bytes) { |
443 | err = -EINVAL; | |
444 | break; | |
445 | } | |
446 | ||
447 | err = get_exclusive(desc); | |
448 | if (err < 0) | |
449 | break; | |
450 | ||
1b68d0ee | 451 | err = ubi_start_update(ubi, vol, bytes); |
801c135c AB |
452 | if (bytes == 0) |
453 | revoke_exclusive(desc, UBI_READWRITE); | |
801c135c AB |
454 | break; |
455 | } | |
456 | ||
e653879c AB |
457 | /* Atomic logical eraseblock change command */ |
458 | case UBI_IOCEBCH: | |
459 | { | |
460 | struct ubi_leb_change_req req; | |
461 | ||
462 | err = copy_from_user(&req, argp, | |
463 | sizeof(struct ubi_leb_change_req)); | |
464 | if (err) { | |
465 | err = -EFAULT; | |
466 | break; | |
467 | } | |
468 | ||
469 | if (desc->mode == UBI_READONLY || | |
470 | vol->vol_type == UBI_STATIC_VOLUME) { | |
471 | err = -EROFS; | |
472 | break; | |
473 | } | |
474 | ||
475 | /* Validate the request */ | |
476 | err = -EINVAL; | |
477 | if (req.lnum < 0 || req.lnum >= vol->reserved_pebs || | |
478 | req.bytes < 0 || req.lnum >= vol->usable_leb_size) | |
479 | break; | |
e653879c AB |
480 | |
481 | err = get_exclusive(desc); | |
482 | if (err < 0) | |
483 | break; | |
484 | ||
485 | err = ubi_start_leb_change(ubi, vol, &req); | |
486 | if (req.bytes == 0) | |
487 | revoke_exclusive(desc, UBI_READWRITE); | |
488 | break; | |
489 | } | |
490 | ||
801c135c AB |
491 | /* Logical eraseblock erasure command */ |
492 | case UBI_IOCEBER: | |
493 | { | |
494 | int32_t lnum; | |
495 | ||
bf07803a | 496 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
497 | if (err) { |
498 | err = -EFAULT; | |
499 | break; | |
500 | } | |
501 | ||
e653879c AB |
502 | if (desc->mode == UBI_READONLY || |
503 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
504 | err = -EROFS; |
505 | break; | |
506 | } | |
507 | ||
508 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
509 | err = -EINVAL; | |
510 | break; | |
511 | } | |
512 | ||
c8566350 | 513 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 514 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
515 | if (err) |
516 | break; | |
517 | ||
62f38455 | 518 | err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); |
801c135c AB |
519 | break; |
520 | } | |
141e6ebd CC |
521 | |
522 | /* Logical eraseblock map command */ | |
523 | case UBI_IOCEBMAP: | |
524 | { | |
525 | struct ubi_map_req req; | |
526 | ||
527 | err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); | |
528 | if (err) { | |
529 | err = -EFAULT; | |
530 | break; | |
531 | } | |
b36a261e | 532 | err = ubi_leb_map(desc, req.lnum); |
141e6ebd CC |
533 | break; |
534 | } | |
c3da23be CC |
535 | |
536 | /* Logical eraseblock un-map command */ | |
537 | case UBI_IOCEBUNMAP: | |
538 | { | |
539 | int32_t lnum; | |
540 | ||
541 | err = get_user(lnum, (__user int32_t *)argp); | |
542 | if (err) { | |
543 | err = -EFAULT; | |
544 | break; | |
545 | } | |
546 | err = ubi_leb_unmap(desc, lnum); | |
547 | break; | |
548 | } | |
a27ce8f5 CC |
549 | |
550 | /* Check if logical eraseblock is mapped command */ | |
551 | case UBI_IOCEBISMAP: | |
552 | { | |
553 | int32_t lnum; | |
554 | ||
555 | err = get_user(lnum, (__user int32_t *)argp); | |
556 | if (err) { | |
557 | err = -EFAULT; | |
558 | break; | |
559 | } | |
560 | err = ubi_is_mapped(desc, lnum); | |
561 | break; | |
562 | } | |
801c135c | 563 | |
f089c0b2 | 564 | /* Set volume property command */ |
6748482f | 565 | case UBI_IOCSETVOLPROP: |
766fb95b | 566 | { |
6748482f | 567 | struct ubi_set_vol_prop_req req; |
766fb95b SA |
568 | |
569 | err = copy_from_user(&req, argp, | |
6748482f | 570 | sizeof(struct ubi_set_vol_prop_req)); |
766fb95b SA |
571 | if (err) { |
572 | err = -EFAULT; | |
573 | break; | |
574 | } | |
575 | switch (req.property) { | |
6748482f | 576 | case UBI_VOL_PROP_DIRECT_WRITE: |
f089c0b2 | 577 | mutex_lock(&ubi->device_mutex); |
766fb95b | 578 | desc->vol->direct_writes = !!req.value; |
f089c0b2 | 579 | mutex_unlock(&ubi->device_mutex); |
766fb95b SA |
580 | break; |
581 | default: | |
582 | err = -EINVAL; | |
583 | break; | |
584 | } | |
585 | break; | |
586 | } | |
587 | ||
801c135c AB |
588 | default: |
589 | err = -ENOTTY; | |
590 | break; | |
591 | } | |
801c135c AB |
592 | return err; |
593 | } | |
594 | ||
595 | /** | |
596 | * verify_mkvol_req - verify volume creation request. | |
597 | * @ubi: UBI device description object | |
598 | * @req: the request to check | |
599 | * | |
600 | * This function zero if the request is correct, and %-EINVAL if not. | |
601 | */ | |
602 | static int verify_mkvol_req(const struct ubi_device *ubi, | |
603 | const struct ubi_mkvol_req *req) | |
604 | { | |
605 | int n, err = -EINVAL; | |
606 | ||
607 | if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || | |
608 | req->name_len < 0) | |
609 | goto bad; | |
610 | ||
611 | if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && | |
612 | req->vol_id != UBI_VOL_NUM_AUTO) | |
613 | goto bad; | |
614 | ||
615 | if (req->alignment == 0) | |
616 | goto bad; | |
617 | ||
618 | if (req->bytes == 0) | |
619 | goto bad; | |
620 | ||
621 | if (req->vol_type != UBI_DYNAMIC_VOLUME && | |
622 | req->vol_type != UBI_STATIC_VOLUME) | |
623 | goto bad; | |
624 | ||
625 | if (req->alignment > ubi->leb_size) | |
626 | goto bad; | |
627 | ||
cadb40cc | 628 | n = req->alignment & (ubi->min_io_size - 1); |
801c135c AB |
629 | if (req->alignment != 1 && n) |
630 | goto bad; | |
631 | ||
4a59c797 RW |
632 | if (!req->name[0] || !req->name_len) |
633 | goto bad; | |
634 | ||
801c135c AB |
635 | if (req->name_len > UBI_VOL_NAME_MAX) { |
636 | err = -ENAMETOOLONG; | |
637 | goto bad; | |
638 | } | |
639 | ||
a6ea4407 AB |
640 | n = strnlen(req->name, req->name_len + 1); |
641 | if (n != req->name_len) | |
642 | goto bad; | |
643 | ||
801c135c AB |
644 | return 0; |
645 | ||
646 | bad: | |
e2986827 | 647 | ubi_err("bad volume creation request"); |
718c00bb | 648 | ubi_dump_mkvol_req(req); |
801c135c AB |
649 | return err; |
650 | } | |
651 | ||
652 | /** | |
653 | * verify_rsvol_req - verify volume re-size request. | |
654 | * @ubi: UBI device description object | |
655 | * @req: the request to check | |
656 | * | |
657 | * This function returns zero if the request is correct, and %-EINVAL if not. | |
658 | */ | |
659 | static int verify_rsvol_req(const struct ubi_device *ubi, | |
660 | const struct ubi_rsvol_req *req) | |
661 | { | |
662 | if (req->bytes <= 0) | |
663 | return -EINVAL; | |
664 | ||
665 | if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) | |
666 | return -EINVAL; | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
f40ac9cd AB |
671 | /** |
672 | * rename_volumes - rename UBI volumes. | |
673 | * @ubi: UBI device description object | |
674 | * @req: volumes re-name request | |
675 | * | |
676 | * This is a helper function for the volume re-name IOCTL which validates the | |
677 | * the request, opens the volume and calls corresponding volumes management | |
678 | * function. Returns zero in case of success and a negative error code in case | |
679 | * of failure. | |
680 | */ | |
681 | static int rename_volumes(struct ubi_device *ubi, | |
682 | struct ubi_rnvol_req *req) | |
683 | { | |
684 | int i, n, err; | |
685 | struct list_head rename_list; | |
686 | struct ubi_rename_entry *re, *re1; | |
687 | ||
688 | if (req->count < 0 || req->count > UBI_MAX_RNVOL) | |
689 | return -EINVAL; | |
690 | ||
691 | if (req->count == 0) | |
692 | return 0; | |
693 | ||
694 | /* Validate volume IDs and names in the request */ | |
695 | for (i = 0; i < req->count; i++) { | |
696 | if (req->ents[i].vol_id < 0 || | |
697 | req->ents[i].vol_id >= ubi->vtbl_slots) | |
698 | return -EINVAL; | |
699 | if (req->ents[i].name_len < 0) | |
700 | return -EINVAL; | |
701 | if (req->ents[i].name_len > UBI_VOL_NAME_MAX) | |
702 | return -ENAMETOOLONG; | |
703 | req->ents[i].name[req->ents[i].name_len] = '\0'; | |
704 | n = strlen(req->ents[i].name); | |
705 | if (n != req->ents[i].name_len) | |
706 | err = -EINVAL; | |
707 | } | |
708 | ||
709 | /* Make sure volume IDs and names are unique */ | |
710 | for (i = 0; i < req->count - 1; i++) { | |
711 | for (n = i + 1; n < req->count; n++) { | |
712 | if (req->ents[i].vol_id == req->ents[n].vol_id) { | |
e2986827 | 713 | ubi_err("duplicated volume id %d", |
f40ac9cd AB |
714 | req->ents[i].vol_id); |
715 | return -EINVAL; | |
716 | } | |
717 | if (!strcmp(req->ents[i].name, req->ents[n].name)) { | |
e2986827 | 718 | ubi_err("duplicated volume name \"%s\"", |
f40ac9cd AB |
719 | req->ents[i].name); |
720 | return -EINVAL; | |
721 | } | |
722 | } | |
723 | } | |
724 | ||
725 | /* Create the re-name list */ | |
726 | INIT_LIST_HEAD(&rename_list); | |
727 | for (i = 0; i < req->count; i++) { | |
728 | int vol_id = req->ents[i].vol_id; | |
729 | int name_len = req->ents[i].name_len; | |
730 | const char *name = req->ents[i].name; | |
731 | ||
732 | re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); | |
733 | if (!re) { | |
734 | err = -ENOMEM; | |
735 | goto out_free; | |
736 | } | |
737 | ||
738 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
739 | if (IS_ERR(re->desc)) { | |
740 | err = PTR_ERR(re->desc); | |
e2986827 | 741 | ubi_err("cannot open volume %d, error %d", vol_id, err); |
f40ac9cd AB |
742 | kfree(re); |
743 | goto out_free; | |
744 | } | |
745 | ||
746 | /* Skip this re-naming if the name does not really change */ | |
747 | if (re->desc->vol->name_len == name_len && | |
748 | !memcmp(re->desc->vol->name, name, name_len)) { | |
749 | ubi_close_volume(re->desc); | |
750 | kfree(re); | |
751 | continue; | |
752 | } | |
753 | ||
754 | re->new_name_len = name_len; | |
755 | memcpy(re->new_name, name, name_len); | |
756 | list_add_tail(&re->list, &rename_list); | |
719bb840 | 757 | dbg_gen("will rename volume %d from \"%s\" to \"%s\"", |
f40ac9cd AB |
758 | vol_id, re->desc->vol->name, name); |
759 | } | |
760 | ||
761 | if (list_empty(&rename_list)) | |
762 | return 0; | |
763 | ||
764 | /* Find out the volumes which have to be removed */ | |
765 | list_for_each_entry(re, &rename_list, list) { | |
766 | struct ubi_volume_desc *desc; | |
767 | int no_remove_needed = 0; | |
768 | ||
769 | /* | |
770 | * Volume @re->vol_id is going to be re-named to | |
771 | * @re->new_name, while its current name is @name. If a volume | |
772 | * with name @re->new_name currently exists, it has to be | |
773 | * removed, unless it is also re-named in the request (@req). | |
774 | */ | |
775 | list_for_each_entry(re1, &rename_list, list) { | |
776 | if (re->new_name_len == re1->desc->vol->name_len && | |
777 | !memcmp(re->new_name, re1->desc->vol->name, | |
778 | re1->desc->vol->name_len)) { | |
779 | no_remove_needed = 1; | |
780 | break; | |
781 | } | |
782 | } | |
783 | ||
784 | if (no_remove_needed) | |
785 | continue; | |
786 | ||
787 | /* | |
788 | * It seems we need to remove volume with name @re->new_name, | |
789 | * if it exists. | |
790 | */ | |
f2863c54 AB |
791 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, |
792 | UBI_EXCLUSIVE); | |
f40ac9cd AB |
793 | if (IS_ERR(desc)) { |
794 | err = PTR_ERR(desc); | |
795 | if (err == -ENODEV) | |
796 | /* Re-naming into a non-existing volume name */ | |
797 | continue; | |
798 | ||
799 | /* The volume exists but busy, or an error occurred */ | |
e2986827 | 800 | ubi_err("cannot open volume \"%s\", error %d", |
f40ac9cd AB |
801 | re->new_name, err); |
802 | goto out_free; | |
803 | } | |
804 | ||
01ebc12f JL |
805 | re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
806 | if (!re1) { | |
f40ac9cd AB |
807 | err = -ENOMEM; |
808 | ubi_close_volume(desc); | |
809 | goto out_free; | |
810 | } | |
811 | ||
01ebc12f JL |
812 | re1->remove = 1; |
813 | re1->desc = desc; | |
814 | list_add(&re1->list, &rename_list); | |
719bb840 | 815 | dbg_gen("will remove volume %d, name \"%s\"", |
01ebc12f | 816 | re1->desc->vol->vol_id, re1->desc->vol->name); |
f40ac9cd AB |
817 | } |
818 | ||
f089c0b2 | 819 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 820 | err = ubi_rename_volumes(ubi, &rename_list); |
f089c0b2 | 821 | mutex_unlock(&ubi->device_mutex); |
f40ac9cd AB |
822 | |
823 | out_free: | |
824 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
825 | ubi_close_volume(re->desc); | |
826 | list_del(&re->list); | |
827 | kfree(re); | |
828 | } | |
829 | return err; | |
830 | } | |
831 | ||
f429b2ea AB |
832 | static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, |
833 | unsigned long arg) | |
801c135c AB |
834 | { |
835 | int err = 0; | |
836 | struct ubi_device *ubi; | |
837 | struct ubi_volume_desc *desc; | |
838 | void __user *argp = (void __user *)arg; | |
839 | ||
801c135c AB |
840 | if (!capable(CAP_SYS_RESOURCE)) |
841 | return -EPERM; | |
842 | ||
f429b2ea | 843 | ubi = ubi_get_by_major(imajor(file->f_mapping->host)); |
e73f4459 AB |
844 | if (!ubi) |
845 | return -ENODEV; | |
801c135c AB |
846 | |
847 | switch (cmd) { | |
848 | /* Create volume command */ | |
849 | case UBI_IOCMKVOL: | |
850 | { | |
851 | struct ubi_mkvol_req req; | |
852 | ||
c8566350 | 853 | dbg_gen("create volume"); |
897a316c | 854 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
855 | if (err) { |
856 | err = -EFAULT; | |
857 | break; | |
858 | } | |
859 | ||
860 | err = verify_mkvol_req(ubi, &req); | |
861 | if (err) | |
862 | break; | |
863 | ||
f089c0b2 | 864 | mutex_lock(&ubi->device_mutex); |
801c135c | 865 | err = ubi_create_volume(ubi, &req); |
f089c0b2 | 866 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
867 | if (err) |
868 | break; | |
869 | ||
bf07803a | 870 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
871 | if (err) |
872 | err = -EFAULT; | |
873 | ||
874 | break; | |
875 | } | |
876 | ||
877 | /* Remove volume command */ | |
878 | case UBI_IOCRMVOL: | |
879 | { | |
880 | int vol_id; | |
881 | ||
c8566350 | 882 | dbg_gen("remove volume"); |
bf07803a | 883 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
884 | if (err) { |
885 | err = -EFAULT; | |
886 | break; | |
887 | } | |
888 | ||
889 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
890 | if (IS_ERR(desc)) { | |
891 | err = PTR_ERR(desc); | |
892 | break; | |
893 | } | |
894 | ||
f089c0b2 | 895 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 896 | err = ubi_remove_volume(desc, 0); |
f089c0b2 | 897 | mutex_unlock(&ubi->device_mutex); |
40e4d0c1 | 898 | |
450f872a | 899 | /* |
40e4d0c1 AB |
900 | * The volume is deleted (unless an error occurred), and the |
901 | * 'struct ubi_volume' object will be freed when | |
902 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
903 | */ |
904 | ubi_close_volume(desc); | |
801c135c AB |
905 | break; |
906 | } | |
907 | ||
908 | /* Re-size volume command */ | |
909 | case UBI_IOCRSVOL: | |
910 | { | |
911 | int pebs; | |
801c135c AB |
912 | struct ubi_rsvol_req req; |
913 | ||
c8566350 | 914 | dbg_gen("re-size volume"); |
897a316c | 915 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
916 | if (err) { |
917 | err = -EFAULT; | |
918 | break; | |
919 | } | |
920 | ||
921 | err = verify_rsvol_req(ubi, &req); | |
922 | if (err) | |
923 | break; | |
924 | ||
925 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
926 | if (IS_ERR(desc)) { | |
927 | err = PTR_ERR(desc); | |
928 | break; | |
929 | } | |
930 | ||
3013ee31 AB |
931 | pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, |
932 | desc->vol->usable_leb_size); | |
801c135c | 933 | |
f089c0b2 | 934 | mutex_lock(&ubi->device_mutex); |
801c135c | 935 | err = ubi_resize_volume(desc, pebs); |
f089c0b2 | 936 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
937 | ubi_close_volume(desc); |
938 | break; | |
939 | } | |
940 | ||
f40ac9cd AB |
941 | /* Re-name volumes command */ |
942 | case UBI_IOCRNVOL: | |
943 | { | |
944 | struct ubi_rnvol_req *req; | |
945 | ||
719bb840 | 946 | dbg_gen("re-name volumes"); |
f40ac9cd AB |
947 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); |
948 | if (!req) { | |
949 | err = -ENOMEM; | |
950 | break; | |
951 | }; | |
952 | ||
953 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
954 | if (err) { | |
955 | err = -EFAULT; | |
956 | kfree(req); | |
957 | break; | |
958 | } | |
959 | ||
f40ac9cd | 960 | err = rename_volumes(ubi, req); |
f40ac9cd AB |
961 | kfree(req); |
962 | break; | |
963 | } | |
964 | ||
801c135c AB |
965 | default: |
966 | err = -ENOTTY; | |
967 | break; | |
968 | } | |
969 | ||
e73f4459 | 970 | ubi_put_device(ubi); |
801c135c AB |
971 | return err; |
972 | } | |
973 | ||
f429b2ea AB |
974 | static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, |
975 | unsigned long arg) | |
897a316c AB |
976 | { |
977 | int err = 0; | |
978 | void __user *argp = (void __user *)arg; | |
979 | ||
980 | if (!capable(CAP_SYS_RESOURCE)) | |
981 | return -EPERM; | |
982 | ||
983 | switch (cmd) { | |
984 | /* Attach an MTD device command */ | |
985 | case UBI_IOCATT: | |
986 | { | |
987 | struct ubi_attach_req req; | |
988 | struct mtd_info *mtd; | |
989 | ||
c8566350 | 990 | dbg_gen("attach MTD device"); |
897a316c AB |
991 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
992 | if (err) { | |
993 | err = -EFAULT; | |
994 | break; | |
995 | } | |
996 | ||
997 | if (req.mtd_num < 0 || | |
998 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
999 | err = -EINVAL; | |
1000 | break; | |
1001 | } | |
1002 | ||
1003 | mtd = get_mtd_device(NULL, req.mtd_num); | |
1004 | if (IS_ERR(mtd)) { | |
1005 | err = PTR_ERR(mtd); | |
1006 | break; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * Note, further request verification is done by | |
1011 | * 'ubi_attach_mtd_dev()'. | |
1012 | */ | |
1013 | mutex_lock(&ubi_devices_mutex); | |
256334c3 | 1014 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, |
db7e21c2 | 1015 | req.max_beb_per1024); |
897a316c AB |
1016 | mutex_unlock(&ubi_devices_mutex); |
1017 | if (err < 0) | |
1018 | put_mtd_device(mtd); | |
1019 | else | |
1020 | /* @err contains UBI device number */ | |
1021 | err = put_user(err, (__user int32_t *)argp); | |
1022 | ||
1023 | break; | |
1024 | } | |
1025 | ||
1026 | /* Detach an MTD device command */ | |
1027 | case UBI_IOCDET: | |
1028 | { | |
1029 | int ubi_num; | |
1030 | ||
2ce7be1b | 1031 | dbg_gen("detach MTD device"); |
897a316c AB |
1032 | err = get_user(ubi_num, (__user int32_t *)argp); |
1033 | if (err) { | |
1034 | err = -EFAULT; | |
1035 | break; | |
1036 | } | |
1037 | ||
1038 | mutex_lock(&ubi_devices_mutex); | |
1039 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
1040 | mutex_unlock(&ubi_devices_mutex); | |
1041 | break; | |
1042 | } | |
1043 | ||
1044 | default: | |
1045 | err = -ENOTTY; | |
1046 | break; | |
1047 | } | |
1048 | ||
1049 | return err; | |
1050 | } | |
1051 | ||
f429b2ea AB |
1052 | #ifdef CONFIG_COMPAT |
1053 | static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1054 | unsigned long arg) | |
1055 | { | |
1056 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1057 | ||
1058 | return vol_cdev_ioctl(file, cmd, translated_arg); | |
1059 | } | |
1060 | ||
1061 | static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1062 | unsigned long arg) | |
1063 | { | |
1064 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1065 | ||
1066 | return ubi_cdev_ioctl(file, cmd, translated_arg); | |
1067 | } | |
1068 | ||
1069 | static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1070 | unsigned long arg) | |
1071 | { | |
1072 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1073 | ||
1074 | return ctrl_cdev_ioctl(file, cmd, translated_arg); | |
1075 | } | |
1076 | #else | |
1077 | #define vol_cdev_compat_ioctl NULL | |
1078 | #define ubi_cdev_compat_ioctl NULL | |
1079 | #define ctrl_cdev_compat_ioctl NULL | |
1080 | #endif | |
1081 | ||
1082 | /* UBI volume character device operations */ | |
1083 | const struct file_operations ubi_vol_cdev_operations = { | |
1084 | .owner = THIS_MODULE, | |
1085 | .open = vol_cdev_open, | |
1086 | .release = vol_cdev_release, | |
1087 | .llseek = vol_cdev_llseek, | |
1088 | .read = vol_cdev_read, | |
1089 | .write = vol_cdev_write, | |
1b24bc3a | 1090 | .fsync = vol_cdev_fsync, |
f429b2ea AB |
1091 | .unlocked_ioctl = vol_cdev_ioctl, |
1092 | .compat_ioctl = vol_cdev_compat_ioctl, | |
9f961b57 AB |
1093 | }; |
1094 | ||
801c135c | 1095 | /* UBI character device operations */ |
4d187a88 | 1096 | const struct file_operations ubi_cdev_operations = { |
f429b2ea AB |
1097 | .owner = THIS_MODULE, |
1098 | .llseek = no_llseek, | |
1099 | .unlocked_ioctl = ubi_cdev_ioctl, | |
1100 | .compat_ioctl = ubi_cdev_compat_ioctl, | |
801c135c AB |
1101 | }; |
1102 | ||
f429b2ea AB |
1103 | /* UBI control character device operations */ |
1104 | const struct file_operations ubi_ctrl_cdev_operations = { | |
1105 | .owner = THIS_MODULE, | |
1106 | .unlocked_ioctl = ctrl_cdev_ioctl, | |
1107 | .compat_ioctl = ctrl_cdev_compat_ioctl, | |
e10b376e | 1108 | .llseek = no_llseek, |
801c135c | 1109 | }; |