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> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
2ba3d76a | 35 | #include <linux/sched.h> |
3013ee31 | 36 | #include <linux/math64.h> |
2ba3d76a DP |
37 | #include <linux/module.h> |
38 | #include <linux/mutex.h> | |
39 | #include <linux/mtd/ubi.h> | |
40 | #include <linux/mtd/mtd.h> | |
41 | #include "ubi-media.h" | |
42 | ||
43 | #define err_msg(fmt, ...) \ | |
e28453bb | 44 | pr_err("gluebi (pid %d): %s: " fmt "\n", \ |
2ba3d76a DP |
45 | current->pid, __func__, ##__VA_ARGS__) |
46 | ||
47 | /** | |
48 | * struct gluebi_device - a gluebi device description data structure. | |
49 | * @mtd: emulated MTD device description object | |
50 | * @refcnt: gluebi device reference count | |
51 | * @desc: UBI volume descriptor | |
52 | * @ubi_num: UBI device number this gluebi device works on | |
53 | * @vol_id: ID of UBI volume this gluebi device works on | |
54 | * @list: link in a list of gluebi devices | |
55 | */ | |
56 | struct gluebi_device { | |
57 | struct mtd_info mtd; | |
58 | int refcnt; | |
59 | struct ubi_volume_desc *desc; | |
60 | int ubi_num; | |
61 | int vol_id; | |
62 | struct list_head list; | |
63 | }; | |
64 | ||
65 | /* List of all gluebi devices */ | |
66 | static LIST_HEAD(gluebi_devices); | |
67 | static DEFINE_MUTEX(devices_mutex); | |
68 | ||
69 | /** | |
70 | * find_gluebi_nolock - find a gluebi device. | |
71 | * @ubi_num: UBI device number | |
72 | * @vol_id: volume ID | |
73 | * | |
74 | * This function seraches for gluebi device corresponding to UBI device | |
75 | * @ubi_num and UBI volume @vol_id. Returns the gluebi device description | |
76 | * object in case of success and %NULL in case of failure. The caller has to | |
77 | * have the &devices_mutex locked. | |
78 | */ | |
79 | static struct gluebi_device *find_gluebi_nolock(int ubi_num, int vol_id) | |
80 | { | |
81 | struct gluebi_device *gluebi; | |
82 | ||
83 | list_for_each_entry(gluebi, &gluebi_devices, list) | |
84 | if (gluebi->ubi_num == ubi_num && gluebi->vol_id == vol_id) | |
85 | return gluebi; | |
86 | return NULL; | |
87 | } | |
801c135c AB |
88 | |
89 | /** | |
90 | * gluebi_get_device - get MTD device reference. | |
91 | * @mtd: the MTD device description object | |
92 | * | |
93 | * This function is called every time the MTD device is being opened and | |
94 | * implements the MTD get_device() operation. Returns zero in case of success | |
95 | * and a negative error code in case of failure. | |
96 | */ | |
97 | static int gluebi_get_device(struct mtd_info *mtd) | |
98 | { | |
2ba3d76a DP |
99 | struct gluebi_device *gluebi; |
100 | int ubi_mode = UBI_READONLY; | |
801c135c | 101 | |
2ba3d76a DP |
102 | if (!try_module_get(THIS_MODULE)) |
103 | return -ENODEV; | |
801c135c | 104 | |
2ba3d76a DP |
105 | if (mtd->flags & MTD_WRITEABLE) |
106 | ubi_mode = UBI_READWRITE; | |
107 | ||
108 | gluebi = container_of(mtd, struct gluebi_device, mtd); | |
109 | mutex_lock(&devices_mutex); | |
110 | if (gluebi->refcnt > 0) { | |
801c135c AB |
111 | /* |
112 | * The MTD device is already referenced and this is just one | |
113 | * more reference. MTD allows many users to open the same | |
114 | * volume simultaneously and do not distinguish between | |
115 | * readers/writers/exclusive openers as UBI does. So we do not | |
116 | * open the UBI volume again - just increase the reference | |
117 | * counter and return. | |
118 | */ | |
2ba3d76a DP |
119 | gluebi->refcnt += 1; |
120 | mutex_unlock(&devices_mutex); | |
801c135c AB |
121 | return 0; |
122 | } | |
123 | ||
124 | /* | |
125 | * This is the first reference to this UBI volume via the MTD device | |
126 | * interface. Open the corresponding volume in read-write mode. | |
127 | */ | |
2ba3d76a DP |
128 | gluebi->desc = ubi_open_volume(gluebi->ubi_num, gluebi->vol_id, |
129 | ubi_mode); | |
130 | if (IS_ERR(gluebi->desc)) { | |
131 | mutex_unlock(&devices_mutex); | |
132 | module_put(THIS_MODULE); | |
133 | return PTR_ERR(gluebi->desc); | |
134 | } | |
135 | gluebi->refcnt += 1; | |
136 | mutex_unlock(&devices_mutex); | |
801c135c AB |
137 | return 0; |
138 | } | |
139 | ||
140 | /** | |
141 | * gluebi_put_device - put MTD device reference. | |
142 | * @mtd: the MTD device description object | |
143 | * | |
144 | * This function is called every time the MTD device is being put. Returns | |
145 | * zero in case of success and a negative error code in case of failure. | |
146 | */ | |
147 | static void gluebi_put_device(struct mtd_info *mtd) | |
148 | { | |
2ba3d76a DP |
149 | struct gluebi_device *gluebi; |
150 | ||
151 | gluebi = container_of(mtd, struct gluebi_device, mtd); | |
152 | mutex_lock(&devices_mutex); | |
153 | gluebi->refcnt -= 1; | |
154 | if (gluebi->refcnt == 0) | |
155 | ubi_close_volume(gluebi->desc); | |
156 | module_put(THIS_MODULE); | |
157 | mutex_unlock(&devices_mutex); | |
801c135c AB |
158 | } |
159 | ||
160 | /** | |
161 | * gluebi_read - read operation of emulated MTD devices. | |
162 | * @mtd: MTD device description object | |
163 | * @from: absolute offset from where to read | |
164 | * @len: how many bytes to read | |
165 | * @retlen: count of read bytes is returned here | |
166 | * @buf: buffer to store the read data | |
167 | * | |
168 | * This function returns zero in case of success and a negative error code in | |
169 | * case of failure. | |
170 | */ | |
171 | static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len, | |
172 | size_t *retlen, unsigned char *buf) | |
173 | { | |
41c04384 | 174 | int err = 0, lnum, offs, bytes_left; |
2ba3d76a | 175 | struct gluebi_device *gluebi; |
801c135c | 176 | |
2ba3d76a | 177 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
3013ee31 | 178 | lnum = div_u64_rem(from, mtd->erasesize, &offs); |
41c04384 EG |
179 | bytes_left = len; |
180 | while (bytes_left) { | |
801c135c AB |
181 | size_t to_read = mtd->erasesize - offs; |
182 | ||
41c04384 EG |
183 | if (to_read > bytes_left) |
184 | to_read = bytes_left; | |
801c135c | 185 | |
2ba3d76a | 186 | err = ubi_read(gluebi->desc, lnum, buf, offs, to_read); |
801c135c AB |
187 | if (err) |
188 | break; | |
189 | ||
190 | lnum += 1; | |
191 | offs = 0; | |
41c04384 | 192 | bytes_left -= to_read; |
801c135c AB |
193 | buf += to_read; |
194 | } | |
195 | ||
41c04384 | 196 | *retlen = len - bytes_left; |
801c135c AB |
197 | return err; |
198 | } | |
199 | ||
200 | /** | |
201 | * gluebi_write - write operation of emulated MTD devices. | |
202 | * @mtd: MTD device description object | |
203 | * @to: absolute offset where to write | |
204 | * @len: how many bytes to write | |
205 | * @retlen: count of written bytes is returned here | |
206 | * @buf: buffer with data to write | |
207 | * | |
208 | * This function returns zero in case of success and a negative error code in | |
209 | * case of failure. | |
210 | */ | |
211 | static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len, | |
2ba3d76a | 212 | size_t *retlen, const u_char *buf) |
801c135c | 213 | { |
41c04384 | 214 | int err = 0, lnum, offs, bytes_left; |
2ba3d76a | 215 | struct gluebi_device *gluebi; |
801c135c | 216 | |
2ba3d76a | 217 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
3013ee31 | 218 | lnum = div_u64_rem(to, mtd->erasesize, &offs); |
801c135c AB |
219 | |
220 | if (len % mtd->writesize || offs % mtd->writesize) | |
221 | return -EINVAL; | |
222 | ||
41c04384 EG |
223 | bytes_left = len; |
224 | while (bytes_left) { | |
801c135c AB |
225 | size_t to_write = mtd->erasesize - offs; |
226 | ||
41c04384 EG |
227 | if (to_write > bytes_left) |
228 | to_write = bytes_left; | |
801c135c | 229 | |
b36a261e | 230 | err = ubi_leb_write(gluebi->desc, lnum, buf, offs, to_write); |
801c135c AB |
231 | if (err) |
232 | break; | |
233 | ||
234 | lnum += 1; | |
235 | offs = 0; | |
41c04384 | 236 | bytes_left -= to_write; |
801c135c AB |
237 | buf += to_write; |
238 | } | |
239 | ||
41c04384 | 240 | *retlen = len - bytes_left; |
801c135c AB |
241 | return err; |
242 | } | |
243 | ||
244 | /** | |
245 | * gluebi_erase - erase operation of emulated MTD devices. | |
246 | * @mtd: the MTD device description object | |
247 | * @instr: the erase operation description | |
248 | * | |
249 | * This function calls the erase callback when finishes. Returns zero in case | |
250 | * of success and a negative error code in case of failure. | |
251 | */ | |
252 | static int gluebi_erase(struct mtd_info *mtd, struct erase_info *instr) | |
253 | { | |
254 | int err, i, lnum, count; | |
2ba3d76a | 255 | struct gluebi_device *gluebi; |
801c135c | 256 | |
69423d99 | 257 | if (mtd_mod_by_ws(instr->addr, mtd) || mtd_mod_by_ws(instr->len, mtd)) |
801c135c AB |
258 | return -EINVAL; |
259 | ||
69423d99 AH |
260 | lnum = mtd_div_by_eb(instr->addr, mtd); |
261 | count = mtd_div_by_eb(instr->len, mtd); | |
2ba3d76a | 262 | gluebi = container_of(mtd, struct gluebi_device, mtd); |
801c135c | 263 | |
2ba3d76a DP |
264 | for (i = 0; i < count - 1; i++) { |
265 | err = ubi_leb_unmap(gluebi->desc, lnum + i); | |
801c135c AB |
266 | if (err) |
267 | goto out_err; | |
268 | } | |
801c135c AB |
269 | /* |
270 | * MTD erase operations are synchronous, so we have to make sure the | |
271 | * physical eraseblock is wiped out. | |
2ba3d76a DP |
272 | * |
273 | * Thus, perform leb_erase instead of leb_unmap operation - leb_erase | |
274 | * will wait for the end of operations | |
801c135c | 275 | */ |
2ba3d76a | 276 | err = ubi_leb_erase(gluebi->desc, lnum + i); |
801c135c AB |
277 | if (err) |
278 | goto out_err; | |
279 | ||
9c9ec147 AB |
280 | instr->state = MTD_ERASE_DONE; |
281 | mtd_erase_callback(instr); | |
801c135c AB |
282 | return 0; |
283 | ||
284 | out_err: | |
285 | instr->state = MTD_ERASE_FAILED; | |
69423d99 | 286 | instr->fail_addr = (long long)lnum * mtd->erasesize; |
801c135c AB |
287 | return err; |
288 | } | |
289 | ||
290 | /** | |
2ba3d76a DP |
291 | * gluebi_create - create a gluebi device for an UBI volume. |
292 | * @di: UBI device description object | |
293 | * @vi: UBI volume description object | |
801c135c | 294 | * |
2ba3d76a | 295 | * This function is called when a new UBI volume is created in order to create |
801c135c AB |
296 | * corresponding fake MTD device. Returns zero in case of success and a |
297 | * negative error code in case of failure. | |
298 | */ | |
2ba3d76a DP |
299 | static int gluebi_create(struct ubi_device_info *di, |
300 | struct ubi_volume_info *vi) | |
801c135c | 301 | { |
2ba3d76a DP |
302 | struct gluebi_device *gluebi, *g; |
303 | struct mtd_info *mtd; | |
801c135c | 304 | |
2ba3d76a DP |
305 | gluebi = kzalloc(sizeof(struct gluebi_device), GFP_KERNEL); |
306 | if (!gluebi) | |
801c135c AB |
307 | return -ENOMEM; |
308 | ||
2ba3d76a DP |
309 | mtd = &gluebi->mtd; |
310 | mtd->name = kmemdup(vi->name, vi->name_len + 1, GFP_KERNEL); | |
311 | if (!mtd->name) { | |
312 | kfree(gluebi); | |
313 | return -ENOMEM; | |
314 | } | |
315 | ||
316 | gluebi->vol_id = vi->vol_id; | |
c8cc4525 | 317 | gluebi->ubi_num = vi->ubi_num; |
801c135c | 318 | mtd->type = MTD_UBIVOLUME; |
2ba3d76a | 319 | if (!di->ro_mode) |
801c135c | 320 | mtd->flags = MTD_WRITEABLE; |
801c135c | 321 | mtd->owner = THIS_MODULE; |
2ba3d76a DP |
322 | mtd->writesize = di->min_io_size; |
323 | mtd->erasesize = vi->usable_leb_size; | |
3c3c10bb AB |
324 | mtd->_read = gluebi_read; |
325 | mtd->_write = gluebi_write; | |
326 | mtd->_erase = gluebi_erase; | |
327 | mtd->_get_device = gluebi_get_device; | |
328 | mtd->_put_device = gluebi_put_device; | |
801c135c | 329 | |
941dfb07 | 330 | /* |
2ba3d76a | 331 | * In case of dynamic a volume, MTD device size is just volume size. In |
941dfb07 | 332 | * case of a static volume the size is equivalent to the amount of data |
cbd8a9d2 | 333 | * bytes. |
941dfb07 | 334 | */ |
2ba3d76a DP |
335 | if (vi->vol_type == UBI_DYNAMIC_VOLUME) |
336 | mtd->size = (unsigned long long)vi->usable_leb_size * vi->size; | |
cbd8a9d2 | 337 | else |
2ba3d76a DP |
338 | mtd->size = vi->used_bytes; |
339 | ||
340 | /* Just a sanity check - make sure this gluebi device does not exist */ | |
341 | mutex_lock(&devices_mutex); | |
342 | g = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
343 | if (g) | |
049333ce AB |
344 | err_msg("gluebi MTD device %d form UBI device %d volume %d already exists", |
345 | g->mtd.index, vi->ubi_num, vi->vol_id); | |
2ba3d76a | 346 | mutex_unlock(&devices_mutex); |
941dfb07 | 347 | |
ee0e87b1 | 348 | if (mtd_device_register(mtd, NULL, 0)) { |
2ba3d76a | 349 | err_msg("cannot add MTD device"); |
801c135c | 350 | kfree(mtd->name); |
2ba3d76a | 351 | kfree(gluebi); |
801c135c AB |
352 | return -ENFILE; |
353 | } | |
354 | ||
2ba3d76a DP |
355 | mutex_lock(&devices_mutex); |
356 | list_add_tail(&gluebi->list, &gluebi_devices); | |
357 | mutex_unlock(&devices_mutex); | |
801c135c AB |
358 | return 0; |
359 | } | |
360 | ||
361 | /** | |
2ba3d76a DP |
362 | * gluebi_remove - remove a gluebi device. |
363 | * @vi: UBI volume description object | |
801c135c | 364 | * |
2ba3d76a | 365 | * This function is called when an UBI volume is removed and it removes |
801c135c AB |
366 | * corresponding fake MTD device. Returns zero in case of success and a |
367 | * negative error code in case of failure. | |
368 | */ | |
2ba3d76a | 369 | static int gluebi_remove(struct ubi_volume_info *vi) |
801c135c | 370 | { |
2ba3d76a DP |
371 | int err = 0; |
372 | struct mtd_info *mtd; | |
373 | struct gluebi_device *gluebi; | |
374 | ||
375 | mutex_lock(&devices_mutex); | |
376 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
377 | if (!gluebi) { | |
049333ce AB |
378 | err_msg("got remove notification for unknown UBI device %d volume %d", |
379 | vi->ubi_num, vi->vol_id); | |
2ba3d76a DP |
380 | err = -ENOENT; |
381 | } else if (gluebi->refcnt) | |
382 | err = -EBUSY; | |
383 | else | |
384 | list_del(&gluebi->list); | |
385 | mutex_unlock(&devices_mutex); | |
386 | if (err) | |
387 | return err; | |
801c135c | 388 | |
2ba3d76a | 389 | mtd = &gluebi->mtd; |
ee0e87b1 | 390 | err = mtd_device_unregister(mtd); |
2ba3d76a | 391 | if (err) { |
049333ce AB |
392 | err_msg("cannot remove fake MTD device %d, UBI device %d, volume %d, error %d", |
393 | mtd->index, gluebi->ubi_num, gluebi->vol_id, err); | |
2ba3d76a DP |
394 | mutex_lock(&devices_mutex); |
395 | list_add_tail(&gluebi->list, &gluebi_devices); | |
396 | mutex_unlock(&devices_mutex); | |
801c135c | 397 | return err; |
2ba3d76a DP |
398 | } |
399 | ||
801c135c | 400 | kfree(mtd->name); |
2ba3d76a | 401 | kfree(gluebi); |
801c135c AB |
402 | return 0; |
403 | } | |
941dfb07 AB |
404 | |
405 | /** | |
2ba3d76a DP |
406 | * gluebi_updated - UBI volume was updated notifier. |
407 | * @vi: volume info structure | |
941dfb07 | 408 | * |
2ba3d76a DP |
409 | * This function is called every time an UBI volume is updated. It does nothing |
410 | * if te volume @vol is dynamic, and changes MTD device size if the | |
941dfb07 | 411 | * volume is static. This is needed because static volumes cannot be read past |
2ba3d76a DP |
412 | * data they contain. This function returns zero in case of success and a |
413 | * negative error code in case of error. | |
414 | */ | |
415 | static int gluebi_updated(struct ubi_volume_info *vi) | |
416 | { | |
417 | struct gluebi_device *gluebi; | |
418 | ||
419 | mutex_lock(&devices_mutex); | |
420 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
421 | if (!gluebi) { | |
422 | mutex_unlock(&devices_mutex); | |
049333ce AB |
423 | err_msg("got update notification for unknown UBI device %d volume %d", |
424 | vi->ubi_num, vi->vol_id); | |
2ba3d76a DP |
425 | return -ENOENT; |
426 | } | |
427 | ||
428 | if (vi->vol_type == UBI_STATIC_VOLUME) | |
429 | gluebi->mtd.size = vi->used_bytes; | |
430 | mutex_unlock(&devices_mutex); | |
431 | return 0; | |
432 | } | |
433 | ||
434 | /** | |
435 | * gluebi_resized - UBI volume was re-sized notifier. | |
436 | * @vi: volume info structure | |
437 | * | |
438 | * This function is called every time an UBI volume is re-size. It changes the | |
439 | * corresponding fake MTD device size. This function returns zero in case of | |
440 | * success and a negative error code in case of error. | |
441 | */ | |
442 | static int gluebi_resized(struct ubi_volume_info *vi) | |
443 | { | |
444 | struct gluebi_device *gluebi; | |
445 | ||
446 | mutex_lock(&devices_mutex); | |
447 | gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id); | |
448 | if (!gluebi) { | |
449 | mutex_unlock(&devices_mutex); | |
049333ce AB |
450 | err_msg("got update notification for unknown UBI device %d volume %d", |
451 | vi->ubi_num, vi->vol_id); | |
2ba3d76a DP |
452 | return -ENOENT; |
453 | } | |
454 | gluebi->mtd.size = vi->used_bytes; | |
455 | mutex_unlock(&devices_mutex); | |
456 | return 0; | |
457 | } | |
458 | ||
459 | /** | |
460 | * gluebi_notify - UBI notification handler. | |
461 | * @nb: registered notifier block | |
462 | * @l: notification type | |
463 | * @ptr: pointer to the &struct ubi_notification object | |
941dfb07 | 464 | */ |
2ba3d76a DP |
465 | static int gluebi_notify(struct notifier_block *nb, unsigned long l, |
466 | void *ns_ptr) | |
941dfb07 | 467 | { |
2ba3d76a DP |
468 | struct ubi_notification *nt = ns_ptr; |
469 | ||
470 | switch (l) { | |
471 | case UBI_VOLUME_ADDED: | |
472 | gluebi_create(&nt->di, &nt->vi); | |
473 | break; | |
474 | case UBI_VOLUME_REMOVED: | |
475 | gluebi_remove(&nt->vi); | |
476 | break; | |
477 | case UBI_VOLUME_RESIZED: | |
478 | gluebi_resized(&nt->vi); | |
479 | break; | |
480 | case UBI_VOLUME_UPDATED: | |
481 | gluebi_updated(&nt->vi); | |
482 | break; | |
483 | default: | |
484 | break; | |
485 | } | |
486 | return NOTIFY_OK; | |
487 | } | |
941dfb07 | 488 | |
2ba3d76a DP |
489 | static struct notifier_block gluebi_notifier = { |
490 | .notifier_call = gluebi_notify, | |
491 | }; | |
492 | ||
493 | static int __init ubi_gluebi_init(void) | |
494 | { | |
495 | return ubi_register_volume_notifier(&gluebi_notifier, 0); | |
941dfb07 | 496 | } |
2ba3d76a DP |
497 | |
498 | static void __exit ubi_gluebi_exit(void) | |
499 | { | |
500 | struct gluebi_device *gluebi, *g; | |
501 | ||
502 | list_for_each_entry_safe(gluebi, g, &gluebi_devices, list) { | |
503 | int err; | |
504 | struct mtd_info *mtd = &gluebi->mtd; | |
505 | ||
ee0e87b1 | 506 | err = mtd_device_unregister(mtd); |
2ba3d76a | 507 | if (err) |
049333ce AB |
508 | err_msg("error %d while removing gluebi MTD device %d, UBI device %d, volume %d - ignoring", |
509 | err, mtd->index, gluebi->ubi_num, | |
510 | gluebi->vol_id); | |
2ba3d76a DP |
511 | kfree(mtd->name); |
512 | kfree(gluebi); | |
513 | } | |
514 | ubi_unregister_volume_notifier(&gluebi_notifier); | |
515 | } | |
516 | ||
517 | module_init(ubi_gluebi_init); | |
518 | module_exit(ubi_gluebi_exit); | |
519 | MODULE_DESCRIPTION("MTD emulation layer over UBI volumes"); | |
520 | MODULE_AUTHOR("Artem Bityutskiy, Joern Engel"); | |
521 | MODULE_LICENSE("GPL"); |