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), Joern Engel | |
19 | */ | |
20 | ||
21 | /* | |
2ba3d76a DP |
22 | * This is a small driver which implements fake MTD devices on top of UBI |
23 | * volumes. This sounds strange, but it is in fact quite useful to make | |
24 | * MTD-oriented software (including all the legacy software) work on top of | |
25 | * UBI. | |
801c135c AB |
26 | * |
27 | * Gluebi emulates MTD devices of "MTD_UBIVOLUME" type. Their minimal I/O unit | |
2ba3d76a | 28 | * size (@mtd->writesize) is equivalent to the UBI minimal I/O unit. The |
801c135c AB |
29 | * eraseblock size is equivalent to the logical eraseblock size of the volume. |
30 | */ | |
31 | ||
2ba3d76a DP |
32 | #include <linux/err.h> |
33 | #include <linux/list.h> | |
34 | #include <linux/sched.h> | |
3013ee31 | 35 | #include <linux/math64.h> |
2ba3d76a DP |
36 | #include <linux/module.h> |
37 | #include <linux/mutex.h> | |
38 | #include <linux/mtd/ubi.h> | |
39 | #include <linux/mtd/mtd.h> | |
40 | #include "ubi-media.h" | |
41 | ||
42 | #define err_msg(fmt, ...) \ | |
43 | printk(KERN_DEBUG "gluebi (pid %d): %s: " fmt "\n", \ | |
44 | current->pid, __func__, ##__VA_ARGS__) | |
45 | ||
46 | /** | |
47 | * struct gluebi_device - a gluebi device description data structure. | |
48 | * @mtd: emulated MTD device description object | |
49 | * @refcnt: gluebi device reference count | |
50 | * @desc: UBI volume descriptor | |
51 | * @ubi_num: UBI device number this gluebi device works on | |
52 | * @vol_id: ID of UBI volume this gluebi device works on | |
53 | * @list: link in a list of gluebi devices | |
54 | */ | |
55 | struct gluebi_device { | |
56 | struct mtd_info mtd; | |
57 | int refcnt; | |
58 | struct ubi_volume_desc *desc; | |
59 | int ubi_num; | |
60 | int vol_id; | |
61 | struct list_head list; | |
62 | }; | |
63 | ||
64 | /* List of all gluebi devices */ | |
65 | static LIST_HEAD(gluebi_devices); | |
66 | static DEFINE_MUTEX(devices_mutex); | |
67 | ||
68 | /** | |
69 | * find_gluebi_nolock - find a gluebi device. | |
70 | * @ubi_num: UBI device number | |
71 | * @vol_id: volume ID | |
72 | * | |
73 | * This function seraches for gluebi device corresponding to UBI device | |
74 | * @ubi_num and UBI volume @vol_id. Returns the gluebi device description | |
75 | * object in case of success and %NULL in case of failure. The caller has to | |
76 | * have the &devices_mutex locked. | |
77 | */ | |
78 | static struct gluebi_device *find_gluebi_nolock(int ubi_num, int vol_id) | |
79 | { | |
80 | struct gluebi_device *gluebi; | |
81 | ||
82 | list_for_each_entry(gluebi, &gluebi_devices, list) | |
83 | if (gluebi->ubi_num == ubi_num && gluebi->vol_id == vol_id) | |
84 | return gluebi; | |
85 | return NULL; | |
86 | } | |
801c135c AB |
87 | |
88 | /** | |
89 | * gluebi_get_device - get MTD device reference. | |
90 | * @mtd: the MTD device description object | |
91 | * | |
92 | * This function is called every time the MTD device is being opened and | |
93 | * implements the MTD get_device() operation. Returns zero in case of success | |
94 | * and a negative error code in case of failure. | |
95 | */ | |
96 | static int gluebi_get_device(struct mtd_info *mtd) | |
97 | { | |
2ba3d76a DP |
98 | struct gluebi_device *gluebi; |
99 | int ubi_mode = UBI_READONLY; | |
801c135c | 100 | |
2ba3d76a DP |
101 | if (!try_module_get(THIS_MODULE)) |
102 | return -ENODEV; | |
801c135c | 103 | |
2ba3d76a DP |
104 | if (mtd->flags & MTD_WRITEABLE) |
105 | ubi_mode = UBI_READWRITE; | |
106 | ||
107 | gluebi = container_of(mtd, struct gluebi_device, mtd); | |
108 | mutex_lock(&devices_mutex); | |
109 | if (gluebi->refcnt > 0) { | |
801c135c AB |
110 | /* |
111 | * The MTD device is already referenced and this is just one | |
112 | * more reference. MTD allows many users to open the same | |
113 | * volume simultaneously and do not distinguish between | |
114 | * readers/writers/exclusive openers as UBI does. So we do not | |
115 | * open the UBI volume again - just increase the reference | |
116 | * counter and return. | |
117 | */ | |
2ba3d76a DP |
118 | gluebi->refcnt += 1; |
119 | mutex_unlock(&devices_mutex); | |
801c135c AB |
120 | return 0; |
121 | } | |
122 | ||
123 | /* | |
124 | * This is the first reference to this UBI volume via the MTD device | |
125 | * interface. Open the corresponding volume in read-write mode. | |
126 | */ | |
2ba3d76a DP |
127 | gluebi->desc = ubi_open_volume(gluebi->ubi_num, gluebi->vol_id, |
128 | ubi_mode); | |
129 | if (IS_ERR(gluebi->desc)) { | |
130 | mutex_unlock(&devices_mutex); | |
131 | module_put(THIS_MODULE); | |
132 | return PTR_ERR(gluebi->desc); | |
133 | } | |
134 | gluebi->refcnt += 1; | |
135 | mutex_unlock(&devices_mutex); | |
801c135c AB |
136 | return 0; |
137 | } | |
138 | ||
139 | /** | |
140 | * gluebi_put_device - put MTD device reference. | |
141 | * @mtd: the MTD device description object | |
142 | * | |
143 | * This function is called every time the MTD device is being put. Returns | |
144 | * zero in case of success and a negative error code in case of failure. | |
145 | */ | |
146 | static void gluebi_put_device(struct mtd_info *mtd) | |
147 | { | |
2ba3d76a DP |
148 | struct gluebi_device *gluebi; |
149 | ||
150 | gluebi = container_of(mtd, struct gluebi_device, mtd); | |
151 | mutex_lock(&devices_mutex); | |
152 | gluebi->refcnt -= 1; | |
153 | if (gluebi->refcnt == 0) | |
154 | ubi_close_volume(gluebi->desc); | |
155 | module_put(THIS_MODULE); | |
156 | mutex_unlock(&devices_mutex); | |
801c135c AB |
157 | } |
158 | ||
159 | /** | |
160 | * gluebi_read - read operation of emulated MTD devices. | |
161 | * @mtd: MTD device description object | |
162 | * @from: absolute offset from where to read | |
163 | * @len: how many bytes to read | |
164 | * @retlen: count of read bytes is returned here | |
165 | * @buf: buffer to store the read data | |
166 | * | |
167 | * This function returns zero in case of success and a negative error code in | |
168 | * case of failure. | |
169 | */ | |
170 | static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len, | |
171 | size_t *retlen, unsigned char *buf) | |
172 | { | |
173 | int err = 0, lnum, offs, total_read; | |
2ba3d76a | 174 | struct gluebi_device *gluebi; |
801c135c AB |
175 | |
176 | if (len < 0 || from < 0 || from + len > mtd->size) | |
177 | return -EINVAL; | |
178 | ||
2ba3d76a | 179 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
801c135c | 180 | |
3013ee31 | 181 | lnum = div_u64_rem(from, mtd->erasesize, &offs); |
801c135c AB |
182 | total_read = len; |
183 | while (total_read) { | |
184 | size_t to_read = mtd->erasesize - offs; | |
185 | ||
186 | if (to_read > total_read) | |
187 | to_read = total_read; | |
188 | ||
2ba3d76a | 189 | err = ubi_read(gluebi->desc, lnum, buf, offs, to_read); |
801c135c AB |
190 | if (err) |
191 | break; | |
192 | ||
193 | lnum += 1; | |
194 | offs = 0; | |
195 | total_read -= to_read; | |
196 | buf += to_read; | |
197 | } | |
198 | ||
199 | *retlen = len - total_read; | |
200 | return err; | |
201 | } | |
202 | ||
203 | /** | |
204 | * gluebi_write - write operation of emulated MTD devices. | |
205 | * @mtd: MTD device description object | |
206 | * @to: absolute offset where to write | |
207 | * @len: how many bytes to write | |
208 | * @retlen: count of written bytes is returned here | |
209 | * @buf: buffer with data to write | |
210 | * | |
211 | * This function returns zero in case of success and a negative error code in | |
212 | * case of failure. | |
213 | */ | |
214 | static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len, | |
2ba3d76a | 215 | size_t *retlen, const u_char *buf) |
801c135c AB |
216 | { |
217 | int err = 0, lnum, offs, total_written; | |
2ba3d76a | 218 | struct gluebi_device *gluebi; |
801c135c AB |
219 | |
220 | if (len < 0 || to < 0 || len + to > mtd->size) | |
221 | return -EINVAL; | |
222 | ||
2ba3d76a | 223 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
801c135c | 224 | |
2ba3d76a | 225 | if (!(mtd->flags & MTD_WRITEABLE)) |
801c135c AB |
226 | return -EROFS; |
227 | ||
3013ee31 | 228 | lnum = div_u64_rem(to, mtd->erasesize, &offs); |
801c135c AB |
229 | |
230 | if (len % mtd->writesize || offs % mtd->writesize) | |
231 | return -EINVAL; | |
232 | ||
233 | total_written = len; | |
234 | while (total_written) { | |
235 | size_t to_write = mtd->erasesize - offs; | |
236 | ||
237 | if (to_write > total_written) | |
238 | to_write = total_written; | |
239 | ||
2ba3d76a | 240 | err = ubi_write(gluebi->desc, lnum, buf, offs, to_write); |
801c135c AB |
241 | if (err) |
242 | break; | |
243 | ||
244 | lnum += 1; | |
245 | offs = 0; | |
246 | total_written -= to_write; | |
247 | buf += to_write; | |
248 | } | |
249 | ||
250 | *retlen = len - total_written; | |
251 | return err; | |
252 | } | |
253 | ||
254 | /** | |
255 | * gluebi_erase - erase operation of emulated MTD devices. | |
256 | * @mtd: the MTD device description object | |
257 | * @instr: the erase operation description | |
258 | * | |
259 | * This function calls the erase callback when finishes. Returns zero in case | |
260 | * of success and a negative error code in case of failure. | |
261 | */ | |
262 | static int gluebi_erase(struct mtd_info *mtd, struct erase_info *instr) | |
263 | { | |
264 | int err, i, lnum, count; | |
2ba3d76a | 265 | struct gluebi_device *gluebi; |
801c135c AB |
266 | |
267 | if (instr->addr < 0 || instr->addr > mtd->size - mtd->erasesize) | |
268 | return -EINVAL; | |
801c135c AB |
269 | if (instr->len < 0 || instr->addr + instr->len > mtd->size) |
270 | return -EINVAL; | |
69423d99 | 271 | if (mtd_mod_by_ws(instr->addr, mtd) || mtd_mod_by_ws(instr->len, mtd)) |
801c135c AB |
272 | return -EINVAL; |
273 | ||
69423d99 AH |
274 | lnum = mtd_div_by_eb(instr->addr, mtd); |
275 | count = mtd_div_by_eb(instr->len, mtd); | |
801c135c | 276 | |
2ba3d76a | 277 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
801c135c | 278 | |
2ba3d76a | 279 | if (!(mtd->flags & MTD_WRITEABLE)) |
801c135c AB |
280 | return -EROFS; |
281 | ||
2ba3d76a DP |
282 | for (i = 0; i < count - 1; i++) { |
283 | err = ubi_leb_unmap(gluebi->desc, lnum + i); | |
801c135c AB |
284 | if (err) |
285 | goto out_err; | |
286 | } | |
801c135c AB |
287 | /* |
288 | * MTD erase operations are synchronous, so we have to make sure the | |
289 | * physical eraseblock is wiped out. | |
2ba3d76a DP |
290 | * |
291 | * Thus, perform leb_erase instead of leb_unmap operation - leb_erase | |
292 | * will wait for the end of operations | |
801c135c | 293 | */ |
2ba3d76a | 294 | err = ubi_leb_erase(gluebi->desc, lnum + i); |
801c135c AB |
295 | if (err) |
296 | goto out_err; | |
297 | ||
9c9ec147 AB |
298 | instr->state = MTD_ERASE_DONE; |
299 | mtd_erase_callback(instr); | |
801c135c AB |
300 | return 0; |
301 | ||
302 | out_err: | |
303 | instr->state = MTD_ERASE_FAILED; | |
69423d99 | 304 | instr->fail_addr = (long long)lnum * mtd->erasesize; |
801c135c AB |
305 | return err; |
306 | } | |
307 | ||
308 | /** | |
2ba3d76a DP |
309 | * gluebi_create - create a gluebi device for an UBI volume. |
310 | * @di: UBI device description object | |
311 | * @vi: UBI volume description object | |
801c135c | 312 | * |
2ba3d76a | 313 | * This function is called when a new UBI volume is created in order to create |
801c135c AB |
314 | * corresponding fake MTD device. Returns zero in case of success and a |
315 | * negative error code in case of failure. | |
316 | */ | |
2ba3d76a DP |
317 | static int gluebi_create(struct ubi_device_info *di, |
318 | struct ubi_volume_info *vi) | |
801c135c | 319 | { |
2ba3d76a DP |
320 | struct gluebi_device *gluebi, *g; |
321 | struct mtd_info *mtd; | |
801c135c | 322 | |
2ba3d76a DP |
323 | gluebi = kzalloc(sizeof(struct gluebi_device), GFP_KERNEL); |
324 | if (!gluebi) | |
801c135c AB |
325 | return -ENOMEM; |
326 | ||
2ba3d76a DP |
327 | mtd = &gluebi->mtd; |
328 | mtd->name = kmemdup(vi->name, vi->name_len + 1, GFP_KERNEL); | |
329 | if (!mtd->name) { | |
330 | kfree(gluebi); | |
331 | return -ENOMEM; | |
332 | } | |
333 | ||
334 | gluebi->vol_id = vi->vol_id; | |
801c135c | 335 | mtd->type = MTD_UBIVOLUME; |
2ba3d76a | 336 | if (!di->ro_mode) |
801c135c | 337 | mtd->flags = MTD_WRITEABLE; |
801c135c | 338 | mtd->owner = THIS_MODULE; |
2ba3d76a DP |
339 | mtd->writesize = di->min_io_size; |
340 | mtd->erasesize = vi->usable_leb_size; | |
801c135c AB |
341 | mtd->read = gluebi_read; |
342 | mtd->write = gluebi_write; | |
343 | mtd->erase = gluebi_erase; | |
344 | mtd->get_device = gluebi_get_device; | |
345 | mtd->put_device = gluebi_put_device; | |
346 | ||
941dfb07 | 347 | /* |
2ba3d76a | 348 | * In case of dynamic a volume, MTD device size is just volume size. In |
941dfb07 | 349 | * case of a static volume the size is equivalent to the amount of data |
cbd8a9d2 | 350 | * bytes. |
941dfb07 | 351 | */ |
2ba3d76a DP |
352 | if (vi->vol_type == UBI_DYNAMIC_VOLUME) |
353 | mtd->size = (unsigned long long)vi->usable_leb_size * vi->size; | |
cbd8a9d2 | 354 | else |
2ba3d76a DP |
355 | mtd->size = vi->used_bytes; |
356 | ||
357 | /* Just a sanity check - make sure this gluebi device does not exist */ | |
358 | mutex_lock(&devices_mutex); | |
359 | g = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
360 | if (g) | |
361 | err_msg("gluebi MTD device %d form UBI device %d volume %d " | |
362 | "already exists", g->mtd.index, vi->ubi_num, | |
363 | vi->vol_id); | |
364 | mutex_unlock(&devices_mutex); | |
941dfb07 | 365 | |
801c135c | 366 | if (add_mtd_device(mtd)) { |
2ba3d76a | 367 | err_msg("cannot add MTD device"); |
801c135c | 368 | kfree(mtd->name); |
2ba3d76a | 369 | kfree(gluebi); |
801c135c AB |
370 | return -ENFILE; |
371 | } | |
372 | ||
2ba3d76a DP |
373 | mutex_lock(&devices_mutex); |
374 | list_add_tail(&gluebi->list, &gluebi_devices); | |
375 | mutex_unlock(&devices_mutex); | |
801c135c AB |
376 | return 0; |
377 | } | |
378 | ||
379 | /** | |
2ba3d76a DP |
380 | * gluebi_remove - remove a gluebi device. |
381 | * @vi: UBI volume description object | |
801c135c | 382 | * |
2ba3d76a | 383 | * This function is called when an UBI volume is removed and it removes |
801c135c AB |
384 | * corresponding fake MTD device. Returns zero in case of success and a |
385 | * negative error code in case of failure. | |
386 | */ | |
2ba3d76a | 387 | static int gluebi_remove(struct ubi_volume_info *vi) |
801c135c | 388 | { |
2ba3d76a DP |
389 | int err = 0; |
390 | struct mtd_info *mtd; | |
391 | struct gluebi_device *gluebi; | |
392 | ||
393 | mutex_lock(&devices_mutex); | |
394 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
395 | if (!gluebi) { | |
396 | err_msg("got remove notification for unknown UBI device %d " | |
397 | "volume %d", vi->ubi_num, vi->vol_id); | |
398 | err = -ENOENT; | |
399 | } else if (gluebi->refcnt) | |
400 | err = -EBUSY; | |
401 | else | |
402 | list_del(&gluebi->list); | |
403 | mutex_unlock(&devices_mutex); | |
404 | if (err) | |
405 | return err; | |
801c135c | 406 | |
2ba3d76a | 407 | mtd = &gluebi->mtd; |
801c135c | 408 | err = del_mtd_device(mtd); |
2ba3d76a DP |
409 | if (err) { |
410 | err_msg("cannot remove fake MTD device %d, UBI device %d, " | |
411 | "volume %d, error %d", mtd->index, gluebi->ubi_num, | |
412 | gluebi->vol_id, err); | |
413 | mutex_lock(&devices_mutex); | |
414 | list_add_tail(&gluebi->list, &gluebi_devices); | |
415 | mutex_unlock(&devices_mutex); | |
801c135c | 416 | return err; |
2ba3d76a DP |
417 | } |
418 | ||
801c135c | 419 | kfree(mtd->name); |
2ba3d76a | 420 | kfree(gluebi); |
801c135c AB |
421 | return 0; |
422 | } | |
941dfb07 AB |
423 | |
424 | /** | |
2ba3d76a DP |
425 | * gluebi_updated - UBI volume was updated notifier. |
426 | * @vi: volume info structure | |
941dfb07 | 427 | * |
2ba3d76a DP |
428 | * This function is called every time an UBI volume is updated. It does nothing |
429 | * if te volume @vol is dynamic, and changes MTD device size if the | |
941dfb07 | 430 | * volume is static. This is needed because static volumes cannot be read past |
2ba3d76a DP |
431 | * data they contain. This function returns zero in case of success and a |
432 | * negative error code in case of error. | |
433 | */ | |
434 | static int gluebi_updated(struct ubi_volume_info *vi) | |
435 | { | |
436 | struct gluebi_device *gluebi; | |
437 | ||
438 | mutex_lock(&devices_mutex); | |
439 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
440 | if (!gluebi) { | |
441 | mutex_unlock(&devices_mutex); | |
442 | err_msg("got update notification for unknown UBI device %d " | |
443 | "volume %d", vi->ubi_num, vi->vol_id); | |
444 | return -ENOENT; | |
445 | } | |
446 | ||
447 | if (vi->vol_type == UBI_STATIC_VOLUME) | |
448 | gluebi->mtd.size = vi->used_bytes; | |
449 | mutex_unlock(&devices_mutex); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | /** | |
454 | * gluebi_resized - UBI volume was re-sized notifier. | |
455 | * @vi: volume info structure | |
456 | * | |
457 | * This function is called every time an UBI volume is re-size. It changes the | |
458 | * corresponding fake MTD device size. This function returns zero in case of | |
459 | * success and a negative error code in case of error. | |
460 | */ | |
461 | static int gluebi_resized(struct ubi_volume_info *vi) | |
462 | { | |
463 | struct gluebi_device *gluebi; | |
464 | ||
465 | mutex_lock(&devices_mutex); | |
466 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
467 | if (!gluebi) { | |
468 | mutex_unlock(&devices_mutex); | |
469 | err_msg("got update notification for unknown UBI device %d " | |
470 | "volume %d", vi->ubi_num, vi->vol_id); | |
471 | return -ENOENT; | |
472 | } | |
473 | gluebi->mtd.size = vi->used_bytes; | |
474 | mutex_unlock(&devices_mutex); | |
475 | return 0; | |
476 | } | |
477 | ||
478 | /** | |
479 | * gluebi_notify - UBI notification handler. | |
480 | * @nb: registered notifier block | |
481 | * @l: notification type | |
482 | * @ptr: pointer to the &struct ubi_notification object | |
941dfb07 | 483 | */ |
2ba3d76a DP |
484 | static int gluebi_notify(struct notifier_block *nb, unsigned long l, |
485 | void *ns_ptr) | |
941dfb07 | 486 | { |
2ba3d76a DP |
487 | struct ubi_notification *nt = ns_ptr; |
488 | ||
489 | switch (l) { | |
490 | case UBI_VOLUME_ADDED: | |
491 | gluebi_create(&nt->di, &nt->vi); | |
492 | break; | |
493 | case UBI_VOLUME_REMOVED: | |
494 | gluebi_remove(&nt->vi); | |
495 | break; | |
496 | case UBI_VOLUME_RESIZED: | |
497 | gluebi_resized(&nt->vi); | |
498 | break; | |
499 | case UBI_VOLUME_UPDATED: | |
500 | gluebi_updated(&nt->vi); | |
501 | break; | |
502 | default: | |
503 | break; | |
504 | } | |
505 | return NOTIFY_OK; | |
506 | } | |
941dfb07 | 507 | |
2ba3d76a DP |
508 | static struct notifier_block gluebi_notifier = { |
509 | .notifier_call = gluebi_notify, | |
510 | }; | |
511 | ||
512 | static int __init ubi_gluebi_init(void) | |
513 | { | |
514 | return ubi_register_volume_notifier(&gluebi_notifier, 0); | |
941dfb07 | 515 | } |
2ba3d76a DP |
516 | |
517 | static void __exit ubi_gluebi_exit(void) | |
518 | { | |
519 | struct gluebi_device *gluebi, *g; | |
520 | ||
521 | list_for_each_entry_safe(gluebi, g, &gluebi_devices, list) { | |
522 | int err; | |
523 | struct mtd_info *mtd = &gluebi->mtd; | |
524 | ||
525 | err = del_mtd_device(mtd); | |
526 | if (err) | |
527 | err_msg("error %d while removing gluebi MTD device %d, " | |
528 | "UBI device %d, volume %d - ignoring", err, | |
529 | mtd->index, gluebi->ubi_num, gluebi->vol_id); | |
530 | kfree(mtd->name); | |
531 | kfree(gluebi); | |
532 | } | |
533 | ubi_unregister_volume_notifier(&gluebi_notifier); | |
534 | } | |
535 | ||
536 | module_init(ubi_gluebi_init); | |
537 | module_exit(ubi_gluebi_exit); | |
538 | MODULE_DESCRIPTION("MTD emulation layer over UBI volumes"); | |
539 | MODULE_AUTHOR("Artem Bityutskiy, Joern Engel"); | |
540 | MODULE_LICENSE("GPL"); |