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> | |
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 | */ | |
45fc5c81 | 57 | static int get_exclusive(struct ubi_volume_desc *desc) |
801c135c AB |
58 | { |
59 | int users, err; | |
60 | struct ubi_volume *vol = desc->vol; | |
61 | ||
62 | spin_lock(&vol->ubi->volumes_lock); | |
fafdd2bf | 63 | users = vol->readers + vol->writers + vol->exclusive + vol->metaonly; |
801c135c AB |
64 | ubi_assert(users > 0); |
65 | if (users > 1) { | |
45fc5c81 | 66 | ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id); |
801c135c AB |
67 | err = -EBUSY; |
68 | } else { | |
fafdd2bf | 69 | vol->readers = vol->writers = vol->metaonly = 0; |
801c135c AB |
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); | |
fafdd2bf | 89 | ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0); |
801c135c AB |
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; | |
fafdd2bf RW |
96 | else if (mode == UBI_METAONLY) |
97 | vol->metaonly = 1; | |
801c135c AB |
98 | else |
99 | vol->exclusive = 1; | |
100 | spin_unlock(&vol->ubi->volumes_lock); | |
101 | ||
102 | desc->mode = mode; | |
103 | } | |
104 | ||
105 | static int vol_cdev_open(struct inode *inode, struct file *file) | |
106 | { | |
107 | struct ubi_volume_desc *desc; | |
e73f4459 AB |
108 | int vol_id = iminor(inode) - 1, mode, ubi_num; |
109 | ||
110 | ubi_num = ubi_major2num(imajor(inode)); | |
7d200e88 | 111 | if (ubi_num < 0) |
e73f4459 | 112 | return ubi_num; |
801c135c AB |
113 | |
114 | if (file->f_mode & FMODE_WRITE) | |
115 | mode = UBI_READWRITE; | |
116 | else | |
117 | mode = UBI_READONLY; | |
118 | ||
e1cf7e6d | 119 | dbg_gen("open device %d, volume %d, mode %d", |
feddbb34 | 120 | ubi_num, vol_id, mode); |
801c135c | 121 | |
e73f4459 | 122 | desc = ubi_open_volume(ubi_num, vol_id, mode); |
801c135c AB |
123 | if (IS_ERR(desc)) |
124 | return PTR_ERR(desc); | |
125 | ||
126 | file->private_data = desc; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static int vol_cdev_release(struct inode *inode, struct file *file) | |
131 | { | |
132 | struct ubi_volume_desc *desc = file->private_data; | |
133 | struct ubi_volume *vol = desc->vol; | |
134 | ||
e1cf7e6d AB |
135 | dbg_gen("release device %d, volume %d, mode %d", |
136 | vol->ubi->ubi_num, vol->vol_id, desc->mode); | |
801c135c AB |
137 | |
138 | if (vol->updating) { | |
32608703 | 139 | ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged", |
801c135c | 140 | vol->vol_id); |
e653879c | 141 | ubi_assert(!vol->changing_leb); |
801c135c | 142 | vol->updating = 0; |
92ad8f37 | 143 | vfree(vol->upd_buf); |
e653879c | 144 | } else if (vol->changing_leb) { |
049333ce AB |
145 | dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", |
146 | vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, | |
147 | vol->vol_id); | |
e653879c AB |
148 | vol->changing_leb = 0; |
149 | vfree(vol->upd_buf); | |
801c135c AB |
150 | } |
151 | ||
152 | ubi_close_volume(desc); | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) | |
157 | { | |
158 | struct ubi_volume_desc *desc = file->private_data; | |
159 | struct ubi_volume *vol = desc->vol; | |
801c135c AB |
160 | |
161 | if (vol->updating) { | |
feddbb34 | 162 | /* Update is in progress, seeking is prohibited */ |
32608703 | 163 | ubi_err(vol->ubi, "updating"); |
801c135c AB |
164 | return -EBUSY; |
165 | } | |
166 | ||
4a1f2f38 | 167 | return fixed_size_llseek(file, offset, origin, vol->used_bytes); |
801c135c AB |
168 | } |
169 | ||
049333ce AB |
170 | static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, |
171 | int datasync) | |
1b24bc3a CC |
172 | { |
173 | struct ubi_volume_desc *desc = file->private_data; | |
174 | struct ubi_device *ubi = desc->vol->ubi; | |
496ad9aa | 175 | struct inode *inode = file_inode(file); |
02c24a82 | 176 | int err; |
5955102c | 177 | inode_lock(inode); |
02c24a82 | 178 | err = ubi_sync(ubi->ubi_num); |
5955102c | 179 | inode_unlock(inode); |
02c24a82 | 180 | return err; |
1b24bc3a CC |
181 | } |
182 | ||
183 | ||
801c135c AB |
184 | static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, |
185 | loff_t *offp) | |
186 | { | |
187 | struct ubi_volume_desc *desc = file->private_data; | |
188 | struct ubi_volume *vol = desc->vol; | |
189 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 190 | int err, lnum, off, len, tbuf_size; |
801c135c AB |
191 | size_t count_save = count; |
192 | void *tbuf; | |
801c135c | 193 | |
c8566350 | 194 | dbg_gen("read %zd bytes from offset %lld of volume %d", |
ae616e1b | 195 | count, *offp, vol->vol_id); |
801c135c AB |
196 | |
197 | if (vol->updating) { | |
32608703 | 198 | ubi_err(vol->ubi, "updating"); |
801c135c AB |
199 | return -EBUSY; |
200 | } | |
201 | if (vol->upd_marker) { | |
32608703 | 202 | ubi_err(vol->ubi, "damaged volume, update marker is set"); |
801c135c AB |
203 | return -EBADF; |
204 | } | |
205 | if (*offp == vol->used_bytes || count == 0) | |
206 | return 0; | |
207 | ||
208 | if (vol->corrupted) | |
c8566350 | 209 | dbg_gen("read from corrupted volume %d", vol->vol_id); |
801c135c AB |
210 | |
211 | if (*offp + count > vol->used_bytes) | |
212 | count_save = count = vol->used_bytes - *offp; | |
213 | ||
214 | tbuf_size = vol->usable_leb_size; | |
215 | if (count < tbuf_size) | |
216 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 217 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
218 | if (!tbuf) |
219 | return -ENOMEM; | |
220 | ||
221 | len = count > tbuf_size ? tbuf_size : count; | |
3013ee31 | 222 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
801c135c AB |
223 | |
224 | do { | |
225 | cond_resched(); | |
226 | ||
227 | if (off + len >= vol->usable_leb_size) | |
228 | len = vol->usable_leb_size - off; | |
229 | ||
89b96b69 | 230 | err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); |
801c135c AB |
231 | if (err) |
232 | break; | |
233 | ||
234 | off += len; | |
235 | if (off == vol->usable_leb_size) { | |
236 | lnum += 1; | |
237 | off -= vol->usable_leb_size; | |
238 | } | |
239 | ||
240 | count -= len; | |
241 | *offp += len; | |
242 | ||
243 | err = copy_to_user(buf, tbuf, len); | |
244 | if (err) { | |
245 | err = -EFAULT; | |
246 | break; | |
247 | } | |
248 | ||
249 | buf += len; | |
250 | len = count > tbuf_size ? tbuf_size : count; | |
251 | } while (count); | |
252 | ||
92ad8f37 | 253 | vfree(tbuf); |
801c135c AB |
254 | return err ? err : count_save - count; |
255 | } | |
256 | ||
801c135c AB |
257 | /* |
258 | * This function allows to directly write to dynamic UBI volumes, without | |
766fb95b | 259 | * issuing the volume update operation. |
801c135c AB |
260 | */ |
261 | static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, | |
262 | size_t count, loff_t *offp) | |
263 | { | |
264 | struct ubi_volume_desc *desc = file->private_data; | |
265 | struct ubi_volume *vol = desc->vol; | |
266 | struct ubi_device *ubi = vol->ubi; | |
ae616e1b | 267 | int lnum, off, len, tbuf_size, err = 0; |
801c135c AB |
268 | size_t count_save = count; |
269 | char *tbuf; | |
801c135c | 270 | |
766fb95b SA |
271 | if (!vol->direct_writes) |
272 | return -EPERM; | |
273 | ||
c8566350 | 274 | dbg_gen("requested: write %zd bytes to offset %lld of volume %u", |
ae616e1b | 275 | count, *offp, vol->vol_id); |
801c135c AB |
276 | |
277 | if (vol->vol_type == UBI_STATIC_VOLUME) | |
278 | return -EROFS; | |
279 | ||
3013ee31 | 280 | lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); |
cadb40cc | 281 | if (off & (ubi->min_io_size - 1)) { |
32608703 | 282 | ubi_err(ubi, "unaligned position"); |
801c135c AB |
283 | return -EINVAL; |
284 | } | |
285 | ||
286 | if (*offp + count > vol->used_bytes) | |
287 | count_save = count = vol->used_bytes - *offp; | |
288 | ||
289 | /* We can write only in fractions of the minimum I/O unit */ | |
cadb40cc | 290 | if (count & (ubi->min_io_size - 1)) { |
32608703 | 291 | ubi_err(ubi, "unaligned write length"); |
801c135c AB |
292 | return -EINVAL; |
293 | } | |
294 | ||
295 | tbuf_size = vol->usable_leb_size; | |
296 | if (count < tbuf_size) | |
297 | tbuf_size = ALIGN(count, ubi->min_io_size); | |
92ad8f37 | 298 | tbuf = vmalloc(tbuf_size); |
801c135c AB |
299 | if (!tbuf) |
300 | return -ENOMEM; | |
301 | ||
302 | len = count > tbuf_size ? tbuf_size : count; | |
303 | ||
304 | while (count) { | |
305 | cond_resched(); | |
306 | ||
307 | if (off + len >= vol->usable_leb_size) | |
308 | len = vol->usable_leb_size - off; | |
309 | ||
310 | err = copy_from_user(tbuf, buf, len); | |
311 | if (err) { | |
312 | err = -EFAULT; | |
313 | break; | |
314 | } | |
315 | ||
b36a261e | 316 | err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len); |
801c135c AB |
317 | if (err) |
318 | break; | |
319 | ||
320 | off += len; | |
321 | if (off == vol->usable_leb_size) { | |
322 | lnum += 1; | |
323 | off -= vol->usable_leb_size; | |
324 | } | |
325 | ||
326 | count -= len; | |
327 | *offp += len; | |
328 | buf += len; | |
329 | len = count > tbuf_size ? tbuf_size : count; | |
330 | } | |
331 | ||
92ad8f37 | 332 | vfree(tbuf); |
801c135c AB |
333 | return err ? err : count_save - count; |
334 | } | |
335 | ||
801c135c AB |
336 | static ssize_t vol_cdev_write(struct file *file, const char __user *buf, |
337 | size_t count, loff_t *offp) | |
338 | { | |
339 | int err = 0; | |
340 | struct ubi_volume_desc *desc = file->private_data; | |
341 | struct ubi_volume *vol = desc->vol; | |
342 | struct ubi_device *ubi = vol->ubi; | |
343 | ||
e653879c | 344 | if (!vol->updating && !vol->changing_leb) |
801c135c AB |
345 | return vol_cdev_direct_write(file, buf, count, offp); |
346 | ||
e653879c AB |
347 | if (vol->updating) |
348 | err = ubi_more_update_data(ubi, vol, buf, count); | |
349 | else | |
350 | err = ubi_more_leb_change_data(ubi, vol, buf, count); | |
351 | ||
801c135c | 352 | if (err < 0) { |
32608703 | 353 | ubi_err(ubi, "cannot accept more %zd bytes of data, error %d", |
01f7b309 | 354 | count, err); |
801c135c AB |
355 | return err; |
356 | } | |
357 | ||
358 | if (err) { | |
359 | /* | |
e653879c AB |
360 | * The operation is finished, @err contains number of actually |
361 | * written bytes. | |
801c135c AB |
362 | */ |
363 | count = err; | |
364 | ||
e653879c AB |
365 | if (vol->changing_leb) { |
366 | revoke_exclusive(desc, UBI_READWRITE); | |
367 | return count; | |
368 | } | |
369 | ||
801c135c AB |
370 | err = ubi_check_volume(ubi, vol->vol_id); |
371 | if (err < 0) | |
372 | return err; | |
373 | ||
374 | if (err) { | |
32608703 | 375 | ubi_warn(ubi, "volume %d on UBI device %d is corrupted", |
801c135c AB |
376 | vol->vol_id, ubi->ubi_num); |
377 | vol->corrupted = 1; | |
378 | } | |
379 | vol->checked = 1; | |
0e0ee1cc | 380 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); |
801c135c AB |
381 | revoke_exclusive(desc, UBI_READWRITE); |
382 | } | |
383 | ||
801c135c AB |
384 | return count; |
385 | } | |
386 | ||
f429b2ea AB |
387 | static long vol_cdev_ioctl(struct file *file, unsigned int cmd, |
388 | unsigned long arg) | |
801c135c AB |
389 | { |
390 | int err = 0; | |
391 | struct ubi_volume_desc *desc = file->private_data; | |
392 | struct ubi_volume *vol = desc->vol; | |
393 | struct ubi_device *ubi = vol->ubi; | |
394 | void __user *argp = (void __user *)arg; | |
395 | ||
801c135c | 396 | switch (cmd) { |
801c135c AB |
397 | /* Volume update command */ |
398 | case UBI_IOCVOLUP: | |
399 | { | |
400 | int64_t bytes, rsvd_bytes; | |
401 | ||
402 | if (!capable(CAP_SYS_RESOURCE)) { | |
403 | err = -EPERM; | |
404 | break; | |
405 | } | |
406 | ||
407 | err = copy_from_user(&bytes, argp, sizeof(int64_t)); | |
408 | if (err) { | |
409 | err = -EFAULT; | |
410 | break; | |
411 | } | |
412 | ||
413 | if (desc->mode == UBI_READONLY) { | |
414 | err = -EROFS; | |
415 | break; | |
416 | } | |
417 | ||
73789a3d BL |
418 | rsvd_bytes = (long long)vol->reserved_pebs * |
419 | ubi->leb_size-vol->data_pad; | |
801c135c AB |
420 | if (bytes < 0 || bytes > rsvd_bytes) { |
421 | err = -EINVAL; | |
422 | break; | |
423 | } | |
424 | ||
45fc5c81 | 425 | err = get_exclusive(desc); |
801c135c AB |
426 | if (err < 0) |
427 | break; | |
428 | ||
1b68d0ee | 429 | err = ubi_start_update(ubi, vol, bytes); |
fda322a1 EG |
430 | if (bytes == 0) { |
431 | ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); | |
801c135c | 432 | revoke_exclusive(desc, UBI_READWRITE); |
fda322a1 | 433 | } |
801c135c AB |
434 | break; |
435 | } | |
436 | ||
e653879c AB |
437 | /* Atomic logical eraseblock change command */ |
438 | case UBI_IOCEBCH: | |
439 | { | |
440 | struct ubi_leb_change_req req; | |
441 | ||
442 | err = copy_from_user(&req, argp, | |
443 | sizeof(struct ubi_leb_change_req)); | |
444 | if (err) { | |
445 | err = -EFAULT; | |
446 | break; | |
447 | } | |
448 | ||
449 | if (desc->mode == UBI_READONLY || | |
450 | vol->vol_type == UBI_STATIC_VOLUME) { | |
451 | err = -EROFS; | |
452 | break; | |
453 | } | |
454 | ||
455 | /* Validate the request */ | |
456 | err = -EINVAL; | |
457 | if (req.lnum < 0 || req.lnum >= vol->reserved_pebs || | |
299d0c5b | 458 | req.bytes < 0 || req.bytes > vol->usable_leb_size) |
e653879c | 459 | break; |
e653879c | 460 | |
45fc5c81 | 461 | err = get_exclusive(desc); |
e653879c AB |
462 | if (err < 0) |
463 | break; | |
464 | ||
465 | err = ubi_start_leb_change(ubi, vol, &req); | |
466 | if (req.bytes == 0) | |
467 | revoke_exclusive(desc, UBI_READWRITE); | |
468 | break; | |
469 | } | |
470 | ||
801c135c AB |
471 | /* Logical eraseblock erasure command */ |
472 | case UBI_IOCEBER: | |
473 | { | |
474 | int32_t lnum; | |
475 | ||
bf07803a | 476 | err = get_user(lnum, (__user int32_t *)argp); |
801c135c AB |
477 | if (err) { |
478 | err = -EFAULT; | |
479 | break; | |
480 | } | |
481 | ||
e653879c AB |
482 | if (desc->mode == UBI_READONLY || |
483 | vol->vol_type == UBI_STATIC_VOLUME) { | |
801c135c AB |
484 | err = -EROFS; |
485 | break; | |
486 | } | |
487 | ||
488 | if (lnum < 0 || lnum >= vol->reserved_pebs) { | |
489 | err = -EINVAL; | |
490 | break; | |
491 | } | |
492 | ||
c8566350 | 493 | dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); |
89b96b69 | 494 | err = ubi_eba_unmap_leb(ubi, vol, lnum); |
801c135c AB |
495 | if (err) |
496 | break; | |
497 | ||
62f38455 | 498 | err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); |
801c135c AB |
499 | break; |
500 | } | |
141e6ebd CC |
501 | |
502 | /* Logical eraseblock map command */ | |
503 | case UBI_IOCEBMAP: | |
504 | { | |
505 | struct ubi_map_req req; | |
506 | ||
507 | err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); | |
508 | if (err) { | |
509 | err = -EFAULT; | |
510 | break; | |
511 | } | |
b36a261e | 512 | err = ubi_leb_map(desc, req.lnum); |
141e6ebd CC |
513 | break; |
514 | } | |
c3da23be CC |
515 | |
516 | /* Logical eraseblock un-map command */ | |
517 | case UBI_IOCEBUNMAP: | |
518 | { | |
519 | int32_t lnum; | |
520 | ||
521 | err = get_user(lnum, (__user int32_t *)argp); | |
522 | if (err) { | |
523 | err = -EFAULT; | |
524 | break; | |
525 | } | |
526 | err = ubi_leb_unmap(desc, lnum); | |
527 | break; | |
528 | } | |
a27ce8f5 CC |
529 | |
530 | /* Check if logical eraseblock is mapped command */ | |
531 | case UBI_IOCEBISMAP: | |
532 | { | |
533 | int32_t lnum; | |
534 | ||
535 | err = get_user(lnum, (__user int32_t *)argp); | |
536 | if (err) { | |
537 | err = -EFAULT; | |
538 | break; | |
539 | } | |
540 | err = ubi_is_mapped(desc, lnum); | |
541 | break; | |
542 | } | |
801c135c | 543 | |
f089c0b2 | 544 | /* Set volume property command */ |
6748482f | 545 | case UBI_IOCSETVOLPROP: |
766fb95b | 546 | { |
6748482f | 547 | struct ubi_set_vol_prop_req req; |
766fb95b SA |
548 | |
549 | err = copy_from_user(&req, argp, | |
6748482f | 550 | sizeof(struct ubi_set_vol_prop_req)); |
766fb95b SA |
551 | if (err) { |
552 | err = -EFAULT; | |
553 | break; | |
554 | } | |
555 | switch (req.property) { | |
6748482f | 556 | case UBI_VOL_PROP_DIRECT_WRITE: |
f089c0b2 | 557 | mutex_lock(&ubi->device_mutex); |
766fb95b | 558 | desc->vol->direct_writes = !!req.value; |
f089c0b2 | 559 | mutex_unlock(&ubi->device_mutex); |
766fb95b SA |
560 | break; |
561 | default: | |
562 | err = -EINVAL; | |
563 | break; | |
564 | } | |
565 | break; | |
566 | } | |
567 | ||
8af87188 AB |
568 | /* Create a R/O block device on top of the UBI volume */ |
569 | case UBI_IOCVOLCRBLK: | |
9d54c8a3 EG |
570 | { |
571 | struct ubi_volume_info vi; | |
572 | ||
573 | ubi_get_volume_info(desc, &vi); | |
4d283ee2 | 574 | err = ubiblock_create(&vi); |
9d54c8a3 EG |
575 | break; |
576 | } | |
577 | ||
8af87188 AB |
578 | /* Remove the R/O block device */ |
579 | case UBI_IOCVOLRMBLK: | |
9d54c8a3 EG |
580 | { |
581 | struct ubi_volume_info vi; | |
582 | ||
583 | ubi_get_volume_info(desc, &vi); | |
4d283ee2 | 584 | err = ubiblock_remove(&vi); |
9d54c8a3 EG |
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: | |
32608703 | 647 | ubi_err(ubi, "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) | |
7fbbd057 | 706 | return -EINVAL; |
f40ac9cd AB |
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) { | |
32608703 | 713 | ubi_err(ubi, "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)) { | |
32608703 | 718 | ubi_err(ubi, "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 | ||
892abde5 | 738 | re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY); |
f40ac9cd AB |
739 | if (IS_ERR(re->desc)) { |
740 | err = PTR_ERR(re->desc); | |
32608703 TB |
741 | ubi_err(ubi, "cannot open volume %d, error %d", |
742 | vol_id, err); | |
f40ac9cd AB |
743 | kfree(re); |
744 | goto out_free; | |
745 | } | |
746 | ||
747 | /* Skip this re-naming if the name does not really change */ | |
748 | if (re->desc->vol->name_len == name_len && | |
749 | !memcmp(re->desc->vol->name, name, name_len)) { | |
750 | ubi_close_volume(re->desc); | |
751 | kfree(re); | |
752 | continue; | |
753 | } | |
754 | ||
755 | re->new_name_len = name_len; | |
756 | memcpy(re->new_name, name, name_len); | |
757 | list_add_tail(&re->list, &rename_list); | |
719bb840 | 758 | dbg_gen("will rename volume %d from \"%s\" to \"%s\"", |
f40ac9cd AB |
759 | vol_id, re->desc->vol->name, name); |
760 | } | |
761 | ||
762 | if (list_empty(&rename_list)) | |
763 | return 0; | |
764 | ||
765 | /* Find out the volumes which have to be removed */ | |
766 | list_for_each_entry(re, &rename_list, list) { | |
767 | struct ubi_volume_desc *desc; | |
768 | int no_remove_needed = 0; | |
769 | ||
770 | /* | |
771 | * Volume @re->vol_id is going to be re-named to | |
772 | * @re->new_name, while its current name is @name. If a volume | |
773 | * with name @re->new_name currently exists, it has to be | |
774 | * removed, unless it is also re-named in the request (@req). | |
775 | */ | |
776 | list_for_each_entry(re1, &rename_list, list) { | |
777 | if (re->new_name_len == re1->desc->vol->name_len && | |
778 | !memcmp(re->new_name, re1->desc->vol->name, | |
779 | re1->desc->vol->name_len)) { | |
780 | no_remove_needed = 1; | |
781 | break; | |
782 | } | |
783 | } | |
784 | ||
785 | if (no_remove_needed) | |
786 | continue; | |
787 | ||
788 | /* | |
789 | * It seems we need to remove volume with name @re->new_name, | |
790 | * if it exists. | |
791 | */ | |
f2863c54 AB |
792 | desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, |
793 | UBI_EXCLUSIVE); | |
f40ac9cd AB |
794 | if (IS_ERR(desc)) { |
795 | err = PTR_ERR(desc); | |
796 | if (err == -ENODEV) | |
797 | /* Re-naming into a non-existing volume name */ | |
798 | continue; | |
799 | ||
800 | /* The volume exists but busy, or an error occurred */ | |
32608703 | 801 | ubi_err(ubi, "cannot open volume \"%s\", error %d", |
f40ac9cd AB |
802 | re->new_name, err); |
803 | goto out_free; | |
804 | } | |
805 | ||
01ebc12f JL |
806 | re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); |
807 | if (!re1) { | |
f40ac9cd AB |
808 | err = -ENOMEM; |
809 | ubi_close_volume(desc); | |
810 | goto out_free; | |
811 | } | |
812 | ||
01ebc12f JL |
813 | re1->remove = 1; |
814 | re1->desc = desc; | |
815 | list_add(&re1->list, &rename_list); | |
719bb840 | 816 | dbg_gen("will remove volume %d, name \"%s\"", |
01ebc12f | 817 | re1->desc->vol->vol_id, re1->desc->vol->name); |
f40ac9cd AB |
818 | } |
819 | ||
f089c0b2 | 820 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 821 | err = ubi_rename_volumes(ubi, &rename_list); |
f089c0b2 | 822 | mutex_unlock(&ubi->device_mutex); |
f40ac9cd AB |
823 | |
824 | out_free: | |
825 | list_for_each_entry_safe(re, re1, &rename_list, list) { | |
826 | ubi_close_volume(re->desc); | |
827 | list_del(&re->list); | |
828 | kfree(re); | |
829 | } | |
830 | return err; | |
831 | } | |
832 | ||
f429b2ea AB |
833 | static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, |
834 | unsigned long arg) | |
801c135c AB |
835 | { |
836 | int err = 0; | |
837 | struct ubi_device *ubi; | |
838 | struct ubi_volume_desc *desc; | |
839 | void __user *argp = (void __user *)arg; | |
840 | ||
801c135c AB |
841 | if (!capable(CAP_SYS_RESOURCE)) |
842 | return -EPERM; | |
843 | ||
f429b2ea | 844 | ubi = ubi_get_by_major(imajor(file->f_mapping->host)); |
e73f4459 AB |
845 | if (!ubi) |
846 | return -ENODEV; | |
801c135c AB |
847 | |
848 | switch (cmd) { | |
849 | /* Create volume command */ | |
850 | case UBI_IOCMKVOL: | |
851 | { | |
852 | struct ubi_mkvol_req req; | |
853 | ||
c8566350 | 854 | dbg_gen("create volume"); |
897a316c | 855 | err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); |
801c135c AB |
856 | if (err) { |
857 | err = -EFAULT; | |
858 | break; | |
859 | } | |
860 | ||
861 | err = verify_mkvol_req(ubi, &req); | |
862 | if (err) | |
863 | break; | |
864 | ||
f089c0b2 | 865 | mutex_lock(&ubi->device_mutex); |
801c135c | 866 | err = ubi_create_volume(ubi, &req); |
f089c0b2 | 867 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
868 | if (err) |
869 | break; | |
870 | ||
bf07803a | 871 | err = put_user(req.vol_id, (__user int32_t *)argp); |
801c135c AB |
872 | if (err) |
873 | err = -EFAULT; | |
874 | ||
875 | break; | |
876 | } | |
877 | ||
878 | /* Remove volume command */ | |
879 | case UBI_IOCRMVOL: | |
880 | { | |
881 | int vol_id; | |
882 | ||
c8566350 | 883 | dbg_gen("remove volume"); |
bf07803a | 884 | err = get_user(vol_id, (__user int32_t *)argp); |
801c135c AB |
885 | if (err) { |
886 | err = -EFAULT; | |
887 | break; | |
888 | } | |
889 | ||
890 | desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); | |
891 | if (IS_ERR(desc)) { | |
892 | err = PTR_ERR(desc); | |
893 | break; | |
894 | } | |
895 | ||
f089c0b2 | 896 | mutex_lock(&ubi->device_mutex); |
f40ac9cd | 897 | err = ubi_remove_volume(desc, 0); |
f089c0b2 | 898 | mutex_unlock(&ubi->device_mutex); |
40e4d0c1 | 899 | |
450f872a | 900 | /* |
40e4d0c1 AB |
901 | * The volume is deleted (unless an error occurred), and the |
902 | * 'struct ubi_volume' object will be freed when | |
903 | * 'ubi_close_volume()' will call 'put_device()'. | |
450f872a AB |
904 | */ |
905 | ubi_close_volume(desc); | |
801c135c AB |
906 | break; |
907 | } | |
908 | ||
909 | /* Re-size volume command */ | |
910 | case UBI_IOCRSVOL: | |
911 | { | |
912 | int pebs; | |
801c135c AB |
913 | struct ubi_rsvol_req req; |
914 | ||
c8566350 | 915 | dbg_gen("re-size volume"); |
897a316c | 916 | err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); |
801c135c AB |
917 | if (err) { |
918 | err = -EFAULT; | |
919 | break; | |
920 | } | |
921 | ||
922 | err = verify_rsvol_req(ubi, &req); | |
923 | if (err) | |
924 | break; | |
925 | ||
926 | desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); | |
927 | if (IS_ERR(desc)) { | |
928 | err = PTR_ERR(desc); | |
929 | break; | |
930 | } | |
931 | ||
3013ee31 AB |
932 | pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, |
933 | desc->vol->usable_leb_size); | |
801c135c | 934 | |
f089c0b2 | 935 | mutex_lock(&ubi->device_mutex); |
801c135c | 936 | err = ubi_resize_volume(desc, pebs); |
f089c0b2 | 937 | mutex_unlock(&ubi->device_mutex); |
801c135c AB |
938 | ubi_close_volume(desc); |
939 | break; | |
940 | } | |
941 | ||
f40ac9cd AB |
942 | /* Re-name volumes command */ |
943 | case UBI_IOCRNVOL: | |
944 | { | |
945 | struct ubi_rnvol_req *req; | |
946 | ||
719bb840 | 947 | dbg_gen("re-name volumes"); |
f40ac9cd AB |
948 | req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); |
949 | if (!req) { | |
950 | err = -ENOMEM; | |
951 | break; | |
a396ce4b | 952 | } |
f40ac9cd AB |
953 | |
954 | err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); | |
955 | if (err) { | |
956 | err = -EFAULT; | |
957 | kfree(req); | |
958 | break; | |
959 | } | |
960 | ||
f40ac9cd | 961 | err = rename_volumes(ubi, req); |
f40ac9cd AB |
962 | kfree(req); |
963 | break; | |
964 | } | |
965 | ||
801c135c AB |
966 | default: |
967 | err = -ENOTTY; | |
968 | break; | |
969 | } | |
970 | ||
e73f4459 | 971 | ubi_put_device(ubi); |
801c135c AB |
972 | return err; |
973 | } | |
974 | ||
f429b2ea AB |
975 | static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, |
976 | unsigned long arg) | |
897a316c AB |
977 | { |
978 | int err = 0; | |
979 | void __user *argp = (void __user *)arg; | |
980 | ||
981 | if (!capable(CAP_SYS_RESOURCE)) | |
982 | return -EPERM; | |
983 | ||
984 | switch (cmd) { | |
985 | /* Attach an MTD device command */ | |
986 | case UBI_IOCATT: | |
987 | { | |
988 | struct ubi_attach_req req; | |
989 | struct mtd_info *mtd; | |
990 | ||
c8566350 | 991 | dbg_gen("attach MTD device"); |
897a316c AB |
992 | err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); |
993 | if (err) { | |
994 | err = -EFAULT; | |
995 | break; | |
996 | } | |
997 | ||
998 | if (req.mtd_num < 0 || | |
999 | (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { | |
1000 | err = -EINVAL; | |
1001 | break; | |
1002 | } | |
1003 | ||
1004 | mtd = get_mtd_device(NULL, req.mtd_num); | |
1005 | if (IS_ERR(mtd)) { | |
1006 | err = PTR_ERR(mtd); | |
1007 | break; | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Note, further request verification is done by | |
1012 | * 'ubi_attach_mtd_dev()'. | |
1013 | */ | |
1014 | mutex_lock(&ubi_devices_mutex); | |
256334c3 | 1015 | err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, |
db7e21c2 | 1016 | req.max_beb_per1024); |
897a316c AB |
1017 | mutex_unlock(&ubi_devices_mutex); |
1018 | if (err < 0) | |
1019 | put_mtd_device(mtd); | |
1020 | else | |
1021 | /* @err contains UBI device number */ | |
1022 | err = put_user(err, (__user int32_t *)argp); | |
1023 | ||
1024 | break; | |
1025 | } | |
1026 | ||
1027 | /* Detach an MTD device command */ | |
1028 | case UBI_IOCDET: | |
1029 | { | |
1030 | int ubi_num; | |
1031 | ||
2ce7be1b | 1032 | dbg_gen("detach MTD device"); |
897a316c AB |
1033 | err = get_user(ubi_num, (__user int32_t *)argp); |
1034 | if (err) { | |
1035 | err = -EFAULT; | |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | mutex_lock(&ubi_devices_mutex); | |
1040 | err = ubi_detach_mtd_dev(ubi_num, 0); | |
1041 | mutex_unlock(&ubi_devices_mutex); | |
1042 | break; | |
1043 | } | |
1044 | ||
1045 | default: | |
1046 | err = -ENOTTY; | |
1047 | break; | |
1048 | } | |
1049 | ||
1050 | return err; | |
1051 | } | |
1052 | ||
f429b2ea AB |
1053 | #ifdef CONFIG_COMPAT |
1054 | static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1055 | unsigned long arg) | |
1056 | { | |
1057 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1058 | ||
1059 | return vol_cdev_ioctl(file, cmd, translated_arg); | |
1060 | } | |
1061 | ||
1062 | static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1063 | unsigned long arg) | |
1064 | { | |
1065 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1066 | ||
1067 | return ubi_cdev_ioctl(file, cmd, translated_arg); | |
1068 | } | |
1069 | ||
1070 | static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd, | |
1071 | unsigned long arg) | |
1072 | { | |
1073 | unsigned long translated_arg = (unsigned long)compat_ptr(arg); | |
1074 | ||
1075 | return ctrl_cdev_ioctl(file, cmd, translated_arg); | |
1076 | } | |
1077 | #else | |
1078 | #define vol_cdev_compat_ioctl NULL | |
1079 | #define ubi_cdev_compat_ioctl NULL | |
1080 | #define ctrl_cdev_compat_ioctl NULL | |
1081 | #endif | |
1082 | ||
1083 | /* UBI volume character device operations */ | |
1084 | const struct file_operations ubi_vol_cdev_operations = { | |
1085 | .owner = THIS_MODULE, | |
1086 | .open = vol_cdev_open, | |
1087 | .release = vol_cdev_release, | |
1088 | .llseek = vol_cdev_llseek, | |
1089 | .read = vol_cdev_read, | |
1090 | .write = vol_cdev_write, | |
1b24bc3a | 1091 | .fsync = vol_cdev_fsync, |
f429b2ea AB |
1092 | .unlocked_ioctl = vol_cdev_ioctl, |
1093 | .compat_ioctl = vol_cdev_compat_ioctl, | |
9f961b57 AB |
1094 | }; |
1095 | ||
801c135c | 1096 | /* UBI character device operations */ |
4d187a88 | 1097 | const struct file_operations ubi_cdev_operations = { |
f429b2ea AB |
1098 | .owner = THIS_MODULE, |
1099 | .llseek = no_llseek, | |
1100 | .unlocked_ioctl = ubi_cdev_ioctl, | |
1101 | .compat_ioctl = ubi_cdev_compat_ioctl, | |
801c135c AB |
1102 | }; |
1103 | ||
f429b2ea AB |
1104 | /* UBI control character device operations */ |
1105 | const struct file_operations ubi_ctrl_cdev_operations = { | |
1106 | .owner = THIS_MODULE, | |
1107 | .unlocked_ioctl = ctrl_cdev_ioctl, | |
1108 | .compat_ioctl = ctrl_cdev_compat_ioctl, | |
e10b376e | 1109 | .llseek = no_llseek, |
801c135c | 1110 | }; |