1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (c) International Business Machines Corp., 2006 |
4 | * Copyright (c) Nokia Corporation, 2007 |
5 | * |
6 | * Author: Artem Bityutskiy (Битюцкий Артём), |
7 | * Frank Haverkamp |
8 | */ |
9 | |
10 | /* |
11 | * This file includes UBI initialization and building of UBI devices. |
12 | * |
13 | * When UBI is initialized, it attaches all the MTD devices specified as the |
14 | * module load parameters or the kernel boot parameters. If MTD devices were |
15 | * specified, UBI does not attach any MTD device, but it is possible to do |
16 | * later using the "UBI control device". |
17 | */ |
18 | |
19 | #include <linux/err.h> |
20 | #include <linux/module.h> |
21 | #include <linux/moduleparam.h> |
22 | #include <linux/stringify.h> |
23 | #include <linux/namei.h> |
24 | #include <linux/stat.h> |
25 | #include <linux/miscdevice.h> |
26 | #include <linux/mtd/partitions.h> |
27 | #include <linux/log2.h> |
28 | #include <linux/kthread.h> |
29 | #include <linux/kernel.h> |
30 | #include <linux/of.h> |
31 | #include <linux/slab.h> |
32 | #include <linux/major.h> |
33 | #include "ubi.h" |
34 | |
35 | /* Maximum length of the 'mtd=' parameter */ |
36 | #define MTD_PARAM_LEN_MAX 64 |
37 | |
38 | /* Maximum number of comma-separated items in the 'mtd=' parameter */ |
39 | #define MTD_PARAM_MAX_COUNT 6 |
40 | |
41 | /* Maximum value for the number of bad PEBs per 1024 PEBs */ |
42 | #define MAX_MTD_UBI_BEB_LIMIT 768 |
43 | |
44 | #ifdef CONFIG_MTD_UBI_MODULE |
45 | #define ubi_is_module() 1 |
46 | #else |
47 | #define ubi_is_module() 0 |
48 | #endif |
49 | |
50 | /** |
51 | * struct mtd_dev_param - MTD device parameter description data structure. |
52 | * @name: MTD character device node path, MTD device name, or MTD device number |
53 | * string |
54 | * @ubi_num: UBI number |
55 | * @vid_hdr_offs: VID header offset |
56 | * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs |
57 | * @enable_fm: enable fastmap when value is non-zero |
58 | * @need_resv_pool: reserve pool->max_size pebs when value is none-zero |
59 | */ |
60 | struct mtd_dev_param { |
61 | char name[MTD_PARAM_LEN_MAX]; |
62 | int ubi_num; |
63 | int vid_hdr_offs; |
64 | int max_beb_per1024; |
65 | int enable_fm; |
66 | int need_resv_pool; |
67 | }; |
68 | |
69 | /* Numbers of elements set in the @mtd_dev_param array */ |
70 | static int mtd_devs; |
71 | |
72 | /* MTD devices specification parameters */ |
73 | static struct mtd_dev_param mtd_dev_param[UBI_MAX_DEVICES]; |
74 | #ifdef CONFIG_MTD_UBI_FASTMAP |
75 | /* UBI module parameter to enable fastmap automatically on non-fastmap images */ |
76 | static bool fm_autoconvert; |
77 | static bool fm_debug; |
78 | #endif |
79 | |
80 | /* Slab cache for wear-leveling entries */ |
81 | struct kmem_cache *ubi_wl_entry_slab; |
82 | |
83 | /* UBI control character device */ |
84 | static struct miscdevice ubi_ctrl_cdev = { |
85 | .minor = MISC_DYNAMIC_MINOR, |
86 | .name = "ubi_ctrl" , |
87 | .fops = &ubi_ctrl_cdev_operations, |
88 | }; |
89 | |
90 | /* All UBI devices in system */ |
91 | static struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; |
92 | |
93 | /* Serializes UBI devices creations and removals */ |
94 | DEFINE_MUTEX(ubi_devices_mutex); |
95 | |
96 | /* Protects @ubi_devices, @ubi->ref_count and @ubi->is_dead */ |
97 | static DEFINE_SPINLOCK(ubi_devices_lock); |
98 | |
99 | /* "Show" method for files in '/<sysfs>/class/ubi/' */ |
100 | /* UBI version attribute ('/<sysfs>/class/ubi/version') */ |
101 | static ssize_t version_show(const struct class *class, const struct class_attribute *attr, |
102 | char *buf) |
103 | { |
104 | return sprintf(buf, fmt: "%d\n" , UBI_VERSION); |
105 | } |
106 | static CLASS_ATTR_RO(version); |
107 | |
108 | static struct attribute *ubi_class_attrs[] = { |
109 | &class_attr_version.attr, |
110 | NULL, |
111 | }; |
112 | ATTRIBUTE_GROUPS(ubi_class); |
113 | |
114 | /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */ |
115 | struct class ubi_class = { |
116 | .name = UBI_NAME_STR, |
117 | .class_groups = ubi_class_groups, |
118 | }; |
119 | |
120 | static ssize_t dev_attribute_show(struct device *dev, |
121 | struct device_attribute *attr, char *buf); |
122 | |
123 | /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */ |
124 | static struct device_attribute dev_eraseblock_size = |
125 | __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL); |
126 | static struct device_attribute dev_avail_eraseblocks = |
127 | __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL); |
128 | static struct device_attribute dev_total_eraseblocks = |
129 | __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL); |
130 | static struct device_attribute dev_volumes_count = |
131 | __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL); |
132 | static struct device_attribute dev_max_ec = |
133 | __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL); |
134 | static struct device_attribute dev_reserved_for_bad = |
135 | __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL); |
136 | static struct device_attribute dev_bad_peb_count = |
137 | __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL); |
138 | static struct device_attribute dev_max_vol_count = |
139 | __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL); |
140 | static struct device_attribute dev_min_io_size = |
141 | __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL); |
142 | static struct device_attribute dev_bgt_enabled = |
143 | __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL); |
144 | static struct device_attribute dev_mtd_num = |
145 | __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL); |
146 | static struct device_attribute dev_ro_mode = |
147 | __ATTR(ro_mode, S_IRUGO, dev_attribute_show, NULL); |
148 | |
149 | /** |
150 | * ubi_volume_notify - send a volume change notification. |
151 | * @ubi: UBI device description object |
152 | * @vol: volume description object of the changed volume |
153 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) |
154 | * |
155 | * This is a helper function which notifies all subscribers about a volume |
156 | * change event (creation, removal, re-sizing, re-naming, updating). Returns |
157 | * zero in case of success and a negative error code in case of failure. |
158 | */ |
159 | int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) |
160 | { |
161 | int ret; |
162 | struct ubi_notification nt; |
163 | |
164 | ubi_do_get_device_info(ubi, di: &nt.di); |
165 | ubi_do_get_volume_info(ubi, vol, vi: &nt.vi); |
166 | |
167 | switch (ntype) { |
168 | case UBI_VOLUME_ADDED: |
169 | case UBI_VOLUME_REMOVED: |
170 | case UBI_VOLUME_RESIZED: |
171 | case UBI_VOLUME_RENAMED: |
172 | ret = ubi_update_fastmap(ubi); |
173 | if (ret) |
174 | ubi_msg(ubi, fmt: "Unable to write a new fastmap: %i" , ret); |
175 | } |
176 | |
177 | return blocking_notifier_call_chain(nh: &ubi_notifiers, val: ntype, v: &nt); |
178 | } |
179 | |
180 | /** |
181 | * ubi_notify_all - send a notification to all volumes. |
182 | * @ubi: UBI device description object |
183 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) |
184 | * @nb: the notifier to call |
185 | * |
186 | * This function walks all volumes of UBI device @ubi and sends the @ntype |
187 | * notification for each volume. If @nb is %NULL, then all registered notifiers |
188 | * are called, otherwise only the @nb notifier is called. Returns the number of |
189 | * sent notifications. |
190 | */ |
191 | int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb) |
192 | { |
193 | struct ubi_notification nt; |
194 | int i, count = 0; |
195 | |
196 | ubi_do_get_device_info(ubi, di: &nt.di); |
197 | |
198 | mutex_lock(&ubi->device_mutex); |
199 | for (i = 0; i < ubi->vtbl_slots; i++) { |
200 | /* |
201 | * Since the @ubi->device is locked, and we are not going to |
202 | * change @ubi->volumes, we do not have to lock |
203 | * @ubi->volumes_lock. |
204 | */ |
205 | if (!ubi->volumes[i]) |
206 | continue; |
207 | |
208 | ubi_do_get_volume_info(ubi, vol: ubi->volumes[i], vi: &nt.vi); |
209 | if (nb) |
210 | nb->notifier_call(nb, ntype, &nt); |
211 | else |
212 | blocking_notifier_call_chain(nh: &ubi_notifiers, val: ntype, |
213 | v: &nt); |
214 | count += 1; |
215 | } |
216 | mutex_unlock(lock: &ubi->device_mutex); |
217 | |
218 | return count; |
219 | } |
220 | |
221 | /** |
222 | * ubi_enumerate_volumes - send "add" notification for all existing volumes. |
223 | * @nb: the notifier to call |
224 | * |
225 | * This function walks all UBI devices and volumes and sends the |
226 | * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all |
227 | * registered notifiers are called, otherwise only the @nb notifier is called. |
228 | * Returns the number of sent notifications. |
229 | */ |
230 | int ubi_enumerate_volumes(struct notifier_block *nb) |
231 | { |
232 | int i, count = 0; |
233 | |
234 | /* |
235 | * Since the @ubi_devices_mutex is locked, and we are not going to |
236 | * change @ubi_devices, we do not have to lock @ubi_devices_lock. |
237 | */ |
238 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
239 | struct ubi_device *ubi = ubi_devices[i]; |
240 | |
241 | if (!ubi) |
242 | continue; |
243 | count += ubi_notify_all(ubi, ntype: UBI_VOLUME_ADDED, nb); |
244 | } |
245 | |
246 | return count; |
247 | } |
248 | |
249 | /** |
250 | * ubi_get_device - get UBI device. |
251 | * @ubi_num: UBI device number |
252 | * |
253 | * This function returns UBI device description object for UBI device number |
254 | * @ubi_num, or %NULL if the device does not exist. This function increases the |
255 | * device reference count to prevent removal of the device. In other words, the |
256 | * device cannot be removed if its reference count is not zero. |
257 | */ |
258 | struct ubi_device *ubi_get_device(int ubi_num) |
259 | { |
260 | struct ubi_device *ubi; |
261 | |
262 | spin_lock(lock: &ubi_devices_lock); |
263 | ubi = ubi_devices[ubi_num]; |
264 | if (ubi && ubi->is_dead) |
265 | ubi = NULL; |
266 | |
267 | if (ubi) { |
268 | ubi_assert(ubi->ref_count >= 0); |
269 | ubi->ref_count += 1; |
270 | get_device(dev: &ubi->dev); |
271 | } |
272 | spin_unlock(lock: &ubi_devices_lock); |
273 | |
274 | return ubi; |
275 | } |
276 | |
277 | /** |
278 | * ubi_put_device - drop an UBI device reference. |
279 | * @ubi: UBI device description object |
280 | */ |
281 | void ubi_put_device(struct ubi_device *ubi) |
282 | { |
283 | spin_lock(lock: &ubi_devices_lock); |
284 | ubi->ref_count -= 1; |
285 | put_device(dev: &ubi->dev); |
286 | spin_unlock(lock: &ubi_devices_lock); |
287 | } |
288 | |
289 | /** |
290 | * ubi_get_by_major - get UBI device by character device major number. |
291 | * @major: major number |
292 | * |
293 | * This function is similar to 'ubi_get_device()', but it searches the device |
294 | * by its major number. |
295 | */ |
296 | struct ubi_device *ubi_get_by_major(int major) |
297 | { |
298 | int i; |
299 | struct ubi_device *ubi; |
300 | |
301 | spin_lock(lock: &ubi_devices_lock); |
302 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
303 | ubi = ubi_devices[i]; |
304 | if (ubi && !ubi->is_dead && MAJOR(ubi->cdev.dev) == major) { |
305 | ubi_assert(ubi->ref_count >= 0); |
306 | ubi->ref_count += 1; |
307 | get_device(dev: &ubi->dev); |
308 | spin_unlock(lock: &ubi_devices_lock); |
309 | return ubi; |
310 | } |
311 | } |
312 | spin_unlock(lock: &ubi_devices_lock); |
313 | |
314 | return NULL; |
315 | } |
316 | |
317 | /** |
318 | * ubi_major2num - get UBI device number by character device major number. |
319 | * @major: major number |
320 | * |
321 | * This function searches UBI device number object by its major number. If UBI |
322 | * device was not found, this function returns -ENODEV, otherwise the UBI device |
323 | * number is returned. |
324 | */ |
325 | int ubi_major2num(int major) |
326 | { |
327 | int i, ubi_num = -ENODEV; |
328 | |
329 | spin_lock(lock: &ubi_devices_lock); |
330 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
331 | struct ubi_device *ubi = ubi_devices[i]; |
332 | |
333 | if (ubi && !ubi->is_dead && MAJOR(ubi->cdev.dev) == major) { |
334 | ubi_num = ubi->ubi_num; |
335 | break; |
336 | } |
337 | } |
338 | spin_unlock(lock: &ubi_devices_lock); |
339 | |
340 | return ubi_num; |
341 | } |
342 | |
343 | /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */ |
344 | static ssize_t dev_attribute_show(struct device *dev, |
345 | struct device_attribute *attr, char *buf) |
346 | { |
347 | ssize_t ret; |
348 | struct ubi_device *ubi; |
349 | |
350 | /* |
351 | * The below code looks weird, but it actually makes sense. We get the |
352 | * UBI device reference from the contained 'struct ubi_device'. But it |
353 | * is unclear if the device was removed or not yet. Indeed, if the |
354 | * device was removed before we increased its reference count, |
355 | * 'ubi_get_device()' will return -ENODEV and we fail. |
356 | * |
357 | * Remember, 'struct ubi_device' is freed in the release function, so |
358 | * we still can use 'ubi->ubi_num'. |
359 | */ |
360 | ubi = container_of(dev, struct ubi_device, dev); |
361 | |
362 | if (attr == &dev_eraseblock_size) |
363 | ret = sprintf(buf, fmt: "%d\n" , ubi->leb_size); |
364 | else if (attr == &dev_avail_eraseblocks) |
365 | ret = sprintf(buf, fmt: "%d\n" , ubi->avail_pebs); |
366 | else if (attr == &dev_total_eraseblocks) |
367 | ret = sprintf(buf, fmt: "%d\n" , ubi->good_peb_count); |
368 | else if (attr == &dev_volumes_count) |
369 | ret = sprintf(buf, fmt: "%d\n" , ubi->vol_count - UBI_INT_VOL_COUNT); |
370 | else if (attr == &dev_max_ec) |
371 | ret = sprintf(buf, fmt: "%d\n" , ubi->max_ec); |
372 | else if (attr == &dev_reserved_for_bad) |
373 | ret = sprintf(buf, fmt: "%d\n" , ubi->beb_rsvd_pebs); |
374 | else if (attr == &dev_bad_peb_count) |
375 | ret = sprintf(buf, fmt: "%d\n" , ubi->bad_peb_count); |
376 | else if (attr == &dev_max_vol_count) |
377 | ret = sprintf(buf, fmt: "%d\n" , ubi->vtbl_slots); |
378 | else if (attr == &dev_min_io_size) |
379 | ret = sprintf(buf, fmt: "%d\n" , ubi->min_io_size); |
380 | else if (attr == &dev_bgt_enabled) |
381 | ret = sprintf(buf, fmt: "%d\n" , ubi->thread_enabled); |
382 | else if (attr == &dev_mtd_num) |
383 | ret = sprintf(buf, fmt: "%d\n" , ubi->mtd->index); |
384 | else if (attr == &dev_ro_mode) |
385 | ret = sprintf(buf, fmt: "%d\n" , ubi->ro_mode); |
386 | else |
387 | ret = -EINVAL; |
388 | |
389 | return ret; |
390 | } |
391 | |
392 | static struct attribute *ubi_dev_attrs[] = { |
393 | &dev_eraseblock_size.attr, |
394 | &dev_avail_eraseblocks.attr, |
395 | &dev_total_eraseblocks.attr, |
396 | &dev_volumes_count.attr, |
397 | &dev_max_ec.attr, |
398 | &dev_reserved_for_bad.attr, |
399 | &dev_bad_peb_count.attr, |
400 | &dev_max_vol_count.attr, |
401 | &dev_min_io_size.attr, |
402 | &dev_bgt_enabled.attr, |
403 | &dev_mtd_num.attr, |
404 | &dev_ro_mode.attr, |
405 | NULL |
406 | }; |
407 | ATTRIBUTE_GROUPS(ubi_dev); |
408 | |
409 | static void dev_release(struct device *dev) |
410 | { |
411 | struct ubi_device *ubi = container_of(dev, struct ubi_device, dev); |
412 | |
413 | kfree(objp: ubi); |
414 | } |
415 | |
416 | /** |
417 | * kill_volumes - destroy all user volumes. |
418 | * @ubi: UBI device description object |
419 | */ |
420 | static void kill_volumes(struct ubi_device *ubi) |
421 | { |
422 | int i; |
423 | |
424 | for (i = 0; i < ubi->vtbl_slots; i++) |
425 | if (ubi->volumes[i]) |
426 | ubi_free_volume(ubi, vol: ubi->volumes[i]); |
427 | } |
428 | |
429 | /** |
430 | * uif_init - initialize user interfaces for an UBI device. |
431 | * @ubi: UBI device description object |
432 | * |
433 | * This function initializes various user interfaces for an UBI device. If the |
434 | * initialization fails at an early stage, this function frees all the |
435 | * resources it allocated, returns an error. |
436 | * |
437 | * This function returns zero in case of success and a negative error code in |
438 | * case of failure. |
439 | */ |
440 | static int uif_init(struct ubi_device *ubi) |
441 | { |
442 | int i, err; |
443 | dev_t dev; |
444 | |
445 | sprintf(buf: ubi->ubi_name, UBI_NAME_STR "%d" , ubi->ubi_num); |
446 | |
447 | /* |
448 | * Major numbers for the UBI character devices are allocated |
449 | * dynamically. Major numbers of volume character devices are |
450 | * equivalent to ones of the corresponding UBI character device. Minor |
451 | * numbers of UBI character devices are 0, while minor numbers of |
452 | * volume character devices start from 1. Thus, we allocate one major |
453 | * number and ubi->vtbl_slots + 1 minor numbers. |
454 | */ |
455 | err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name); |
456 | if (err) { |
457 | ubi_err(ubi, fmt: "cannot register UBI character devices" ); |
458 | return err; |
459 | } |
460 | |
461 | ubi->dev.devt = dev; |
462 | |
463 | ubi_assert(MINOR(dev) == 0); |
464 | cdev_init(&ubi->cdev, &ubi_cdev_operations); |
465 | dbg_gen("%s major is %u" , ubi->ubi_name, MAJOR(dev)); |
466 | ubi->cdev.owner = THIS_MODULE; |
467 | |
468 | dev_set_name(dev: &ubi->dev, UBI_NAME_STR "%d" , ubi->ubi_num); |
469 | err = cdev_device_add(cdev: &ubi->cdev, dev: &ubi->dev); |
470 | if (err) |
471 | goto out_unreg; |
472 | |
473 | for (i = 0; i < ubi->vtbl_slots; i++) |
474 | if (ubi->volumes[i]) { |
475 | err = ubi_add_volume(ubi, vol: ubi->volumes[i]); |
476 | if (err) { |
477 | ubi_err(ubi, fmt: "cannot add volume %d" , i); |
478 | ubi->volumes[i] = NULL; |
479 | goto out_volumes; |
480 | } |
481 | } |
482 | |
483 | return 0; |
484 | |
485 | out_volumes: |
486 | kill_volumes(ubi); |
487 | cdev_device_del(cdev: &ubi->cdev, dev: &ubi->dev); |
488 | out_unreg: |
489 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
490 | ubi_err(ubi, fmt: "cannot initialize UBI %s, error %d" , |
491 | ubi->ubi_name, err); |
492 | return err; |
493 | } |
494 | |
495 | /** |
496 | * uif_close - close user interfaces for an UBI device. |
497 | * @ubi: UBI device description object |
498 | * |
499 | * Note, since this function un-registers UBI volume device objects (@vol->dev), |
500 | * the memory allocated voe the volumes is freed as well (in the release |
501 | * function). |
502 | */ |
503 | static void uif_close(struct ubi_device *ubi) |
504 | { |
505 | kill_volumes(ubi); |
506 | cdev_device_del(cdev: &ubi->cdev, dev: &ubi->dev); |
507 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
508 | } |
509 | |
510 | /** |
511 | * ubi_free_volumes_from - free volumes from specific index. |
512 | * @ubi: UBI device description object |
513 | * @from: the start index used for volume free. |
514 | */ |
515 | static void ubi_free_volumes_from(struct ubi_device *ubi, int from) |
516 | { |
517 | int i; |
518 | |
519 | for (i = from; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { |
520 | if (!ubi->volumes[i] || ubi->volumes[i]->is_dead) |
521 | continue; |
522 | ubi_eba_replace_table(vol: ubi->volumes[i], NULL); |
523 | ubi_fastmap_destroy_checkmap(vol: ubi->volumes[i]); |
524 | kfree(objp: ubi->volumes[i]); |
525 | ubi->volumes[i] = NULL; |
526 | } |
527 | } |
528 | |
529 | /** |
530 | * ubi_free_all_volumes - free all volumes. |
531 | * @ubi: UBI device description object |
532 | */ |
533 | void ubi_free_all_volumes(struct ubi_device *ubi) |
534 | { |
535 | ubi_free_volumes_from(ubi, from: 0); |
536 | } |
537 | |
538 | /** |
539 | * ubi_free_internal_volumes - free internal volumes. |
540 | * @ubi: UBI device description object |
541 | */ |
542 | void ubi_free_internal_volumes(struct ubi_device *ubi) |
543 | { |
544 | ubi_free_volumes_from(ubi, from: ubi->vtbl_slots); |
545 | } |
546 | |
547 | static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024) |
548 | { |
549 | int limit, device_pebs; |
550 | uint64_t device_size; |
551 | |
552 | if (!max_beb_per1024) { |
553 | /* |
554 | * Since max_beb_per1024 has not been set by the user in either |
555 | * the cmdline or Kconfig, use mtd_max_bad_blocks to set the |
556 | * limit if it is supported by the device. |
557 | */ |
558 | limit = mtd_max_bad_blocks(mtd: ubi->mtd, ofs: 0, len: ubi->mtd->size); |
559 | if (limit < 0) |
560 | return 0; |
561 | return limit; |
562 | } |
563 | |
564 | /* |
565 | * Here we are using size of the entire flash chip and |
566 | * not just the MTD partition size because the maximum |
567 | * number of bad eraseblocks is a percentage of the |
568 | * whole device and bad eraseblocks are not fairly |
569 | * distributed over the flash chip. So the worst case |
570 | * is that all the bad eraseblocks of the chip are in |
571 | * the MTD partition we are attaching (ubi->mtd). |
572 | */ |
573 | device_size = mtd_get_device_size(mtd: ubi->mtd); |
574 | device_pebs = mtd_div_by_eb(sz: device_size, mtd: ubi->mtd); |
575 | limit = mult_frac(device_pebs, max_beb_per1024, 1024); |
576 | |
577 | /* Round it up */ |
578 | if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs) |
579 | limit += 1; |
580 | |
581 | return limit; |
582 | } |
583 | |
584 | /** |
585 | * io_init - initialize I/O sub-system for a given UBI device. |
586 | * @ubi: UBI device description object |
587 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
588 | * |
589 | * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are |
590 | * assumed: |
591 | * o EC header is always at offset zero - this cannot be changed; |
592 | * o VID header starts just after the EC header at the closest address |
593 | * aligned to @io->hdrs_min_io_size; |
594 | * o data starts just after the VID header at the closest address aligned to |
595 | * @io->min_io_size |
596 | * |
597 | * This function returns zero in case of success and a negative error code in |
598 | * case of failure. |
599 | */ |
600 | static int io_init(struct ubi_device *ubi, int max_beb_per1024) |
601 | { |
602 | dbg_gen("sizeof(struct ubi_ainf_peb) %zu" , sizeof(struct ubi_ainf_peb)); |
603 | dbg_gen("sizeof(struct ubi_wl_entry) %zu" , sizeof(struct ubi_wl_entry)); |
604 | |
605 | if (ubi->mtd->numeraseregions != 0) { |
606 | /* |
607 | * Some flashes have several erase regions. Different regions |
608 | * may have different eraseblock size and other |
609 | * characteristics. It looks like mostly multi-region flashes |
610 | * have one "main" region and one or more small regions to |
611 | * store boot loader code or boot parameters or whatever. I |
612 | * guess we should just pick the largest region. But this is |
613 | * not implemented. |
614 | */ |
615 | ubi_err(ubi, fmt: "multiple regions, not implemented" ); |
616 | return -EINVAL; |
617 | } |
618 | |
619 | if (ubi->vid_hdr_offset < 0) |
620 | return -EINVAL; |
621 | |
622 | /* |
623 | * Note, in this implementation we support MTD devices with 0x7FFFFFFF |
624 | * physical eraseblocks maximum. |
625 | */ |
626 | |
627 | ubi->peb_size = ubi->mtd->erasesize; |
628 | ubi->peb_count = mtd_div_by_eb(sz: ubi->mtd->size, mtd: ubi->mtd); |
629 | ubi->flash_size = ubi->mtd->size; |
630 | |
631 | if (mtd_can_have_bb(mtd: ubi->mtd)) { |
632 | ubi->bad_allowed = 1; |
633 | ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024); |
634 | } |
635 | |
636 | if (ubi->mtd->type == MTD_NORFLASH) |
637 | ubi->nor_flash = 1; |
638 | |
639 | ubi->min_io_size = ubi->mtd->writesize; |
640 | ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; |
641 | |
642 | /* |
643 | * Make sure minimal I/O unit is power of 2. Note, there is no |
644 | * fundamental reason for this assumption. It is just an optimization |
645 | * which allows us to avoid costly division operations. |
646 | */ |
647 | if (!is_power_of_2(n: ubi->min_io_size)) { |
648 | ubi_err(ubi, fmt: "min. I/O unit (%d) is not power of 2" , |
649 | ubi->min_io_size); |
650 | return -EINVAL; |
651 | } |
652 | |
653 | ubi_assert(ubi->hdrs_min_io_size > 0); |
654 | ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); |
655 | ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); |
656 | |
657 | ubi->max_write_size = ubi->mtd->writebufsize; |
658 | /* |
659 | * Maximum write size has to be greater or equivalent to min. I/O |
660 | * size, and be multiple of min. I/O size. |
661 | */ |
662 | if (ubi->max_write_size < ubi->min_io_size || |
663 | ubi->max_write_size % ubi->min_io_size || |
664 | !is_power_of_2(n: ubi->max_write_size)) { |
665 | ubi_err(ubi, fmt: "bad write buffer size %d for %d min. I/O unit" , |
666 | ubi->max_write_size, ubi->min_io_size); |
667 | return -EINVAL; |
668 | } |
669 | |
670 | /* Calculate default aligned sizes of EC and VID headers */ |
671 | ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); |
672 | ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); |
673 | |
674 | dbg_gen("min_io_size %d" , ubi->min_io_size); |
675 | dbg_gen("max_write_size %d" , ubi->max_write_size); |
676 | dbg_gen("hdrs_min_io_size %d" , ubi->hdrs_min_io_size); |
677 | dbg_gen("ec_hdr_alsize %d" , ubi->ec_hdr_alsize); |
678 | dbg_gen("vid_hdr_alsize %d" , ubi->vid_hdr_alsize); |
679 | |
680 | if (ubi->vid_hdr_offset == 0) |
681 | /* Default offset */ |
682 | ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = |
683 | ubi->ec_hdr_alsize; |
684 | else { |
685 | ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & |
686 | ~(ubi->hdrs_min_io_size - 1); |
687 | ubi->vid_hdr_shift = ubi->vid_hdr_offset - |
688 | ubi->vid_hdr_aloffset; |
689 | } |
690 | |
691 | /* |
692 | * Memory allocation for VID header is ubi->vid_hdr_alsize |
693 | * which is described in comments in io.c. |
694 | * Make sure VID header shift + UBI_VID_HDR_SIZE not exceeds |
695 | * ubi->vid_hdr_alsize, so that all vid header operations |
696 | * won't access memory out of bounds. |
697 | */ |
698 | if ((ubi->vid_hdr_shift + UBI_VID_HDR_SIZE) > ubi->vid_hdr_alsize) { |
699 | ubi_err(ubi, fmt: "Invalid VID header offset %d, VID header shift(%d)" |
700 | " + VID header size(%zu) > VID header aligned size(%d)." , |
701 | ubi->vid_hdr_offset, ubi->vid_hdr_shift, |
702 | UBI_VID_HDR_SIZE, ubi->vid_hdr_alsize); |
703 | return -EINVAL; |
704 | } |
705 | |
706 | /* Similar for the data offset */ |
707 | ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE; |
708 | ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); |
709 | |
710 | dbg_gen("vid_hdr_offset %d" , ubi->vid_hdr_offset); |
711 | dbg_gen("vid_hdr_aloffset %d" , ubi->vid_hdr_aloffset); |
712 | dbg_gen("vid_hdr_shift %d" , ubi->vid_hdr_shift); |
713 | dbg_gen("leb_start %d" , ubi->leb_start); |
714 | |
715 | /* The shift must be aligned to 32-bit boundary */ |
716 | if (ubi->vid_hdr_shift % 4) { |
717 | ubi_err(ubi, fmt: "unaligned VID header shift %d" , |
718 | ubi->vid_hdr_shift); |
719 | return -EINVAL; |
720 | } |
721 | |
722 | /* Check sanity */ |
723 | if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || |
724 | ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || |
725 | ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || |
726 | ubi->leb_start & (ubi->min_io_size - 1)) { |
727 | ubi_err(ubi, fmt: "bad VID header (%d) or data offsets (%d)" , |
728 | ubi->vid_hdr_offset, ubi->leb_start); |
729 | return -EINVAL; |
730 | } |
731 | |
732 | /* |
733 | * Set maximum amount of physical erroneous eraseblocks to be 10%. |
734 | * Erroneous PEB are those which have read errors. |
735 | */ |
736 | ubi->max_erroneous = ubi->peb_count / 10; |
737 | if (ubi->max_erroneous < 16) |
738 | ubi->max_erroneous = 16; |
739 | dbg_gen("max_erroneous %d" , ubi->max_erroneous); |
740 | |
741 | /* |
742 | * It may happen that EC and VID headers are situated in one minimal |
743 | * I/O unit. In this case we can only accept this UBI image in |
744 | * read-only mode. |
745 | */ |
746 | if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { |
747 | ubi_warn(ubi, fmt: "EC and VID headers are in the same minimal I/O unit, switch to read-only mode" ); |
748 | ubi->ro_mode = 1; |
749 | } |
750 | |
751 | ubi->leb_size = ubi->peb_size - ubi->leb_start; |
752 | |
753 | if (!(ubi->mtd->flags & MTD_WRITEABLE)) { |
754 | ubi_msg(ubi, fmt: "MTD device %d is write-protected, attach in read-only mode" , |
755 | ubi->mtd->index); |
756 | ubi->ro_mode = 1; |
757 | } |
758 | |
759 | /* |
760 | * Note, ideally, we have to initialize @ubi->bad_peb_count here. But |
761 | * unfortunately, MTD does not provide this information. We should loop |
762 | * over all physical eraseblocks and invoke mtd->block_is_bad() for |
763 | * each physical eraseblock. So, we leave @ubi->bad_peb_count |
764 | * uninitialized so far. |
765 | */ |
766 | |
767 | return 0; |
768 | } |
769 | |
770 | /** |
771 | * autoresize - re-size the volume which has the "auto-resize" flag set. |
772 | * @ubi: UBI device description object |
773 | * @vol_id: ID of the volume to re-size |
774 | * |
775 | * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in |
776 | * the volume table to the largest possible size. See comments in ubi-header.h |
777 | * for more description of the flag. Returns zero in case of success and a |
778 | * negative error code in case of failure. |
779 | */ |
780 | static int autoresize(struct ubi_device *ubi, int vol_id) |
781 | { |
782 | struct ubi_volume_desc desc; |
783 | struct ubi_volume *vol = ubi->volumes[vol_id]; |
784 | int err, old_reserved_pebs = vol->reserved_pebs; |
785 | |
786 | if (ubi->ro_mode) { |
787 | ubi_warn(ubi, fmt: "skip auto-resize because of R/O mode" ); |
788 | return 0; |
789 | } |
790 | |
791 | /* |
792 | * Clear the auto-resize flag in the volume in-memory copy of the |
793 | * volume table, and 'ubi_resize_volume()' will propagate this change |
794 | * to the flash. |
795 | */ |
796 | ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; |
797 | |
798 | if (ubi->avail_pebs == 0) { |
799 | struct ubi_vtbl_record vtbl_rec; |
800 | |
801 | /* |
802 | * No available PEBs to re-size the volume, clear the flag on |
803 | * flash and exit. |
804 | */ |
805 | vtbl_rec = ubi->vtbl[vol_id]; |
806 | err = ubi_change_vtbl_record(ubi, idx: vol_id, vtbl_rec: &vtbl_rec); |
807 | if (err) |
808 | ubi_err(ubi, fmt: "cannot clean auto-resize flag for volume %d" , |
809 | vol_id); |
810 | } else { |
811 | desc.vol = vol; |
812 | err = ubi_resize_volume(desc: &desc, |
813 | reserved_pebs: old_reserved_pebs + ubi->avail_pebs); |
814 | if (err) |
815 | ubi_err(ubi, fmt: "cannot auto-resize volume %d" , |
816 | vol_id); |
817 | } |
818 | |
819 | if (err) |
820 | return err; |
821 | |
822 | ubi_msg(ubi, fmt: "volume %d (\"%s\") re-sized from %d to %d LEBs" , |
823 | vol_id, vol->name, old_reserved_pebs, vol->reserved_pebs); |
824 | return 0; |
825 | } |
826 | |
827 | /** |
828 | * ubi_attach_mtd_dev - attach an MTD device. |
829 | * @mtd: MTD device description object |
830 | * @ubi_num: number to assign to the new UBI device |
831 | * @vid_hdr_offset: VID header offset |
832 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
833 | * @disable_fm: whether disable fastmap |
834 | * @need_resv_pool: whether reserve pebs to fill fm_pool |
835 | * |
836 | * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number |
837 | * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in |
838 | * which case this function finds a vacant device number and assigns it |
839 | * automatically. Returns the new UBI device number in case of success and a |
840 | * negative error code in case of failure. |
841 | * |
842 | * If @disable_fm is true, ubi doesn't create new fastmap even the module param |
843 | * 'fm_autoconvert' is set, and existed old fastmap will be destroyed after |
844 | * doing full scanning. |
845 | * |
846 | * Note, the invocations of this function has to be serialized by the |
847 | * @ubi_devices_mutex. |
848 | */ |
849 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, |
850 | int vid_hdr_offset, int max_beb_per1024, bool disable_fm, |
851 | bool need_resv_pool) |
852 | { |
853 | struct ubi_device *ubi; |
854 | int i, err; |
855 | |
856 | if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT) |
857 | return -EINVAL; |
858 | |
859 | if (!max_beb_per1024) |
860 | max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT; |
861 | |
862 | /* |
863 | * Check if we already have the same MTD device attached. |
864 | * |
865 | * Note, this function assumes that UBI devices creations and deletions |
866 | * are serialized, so it does not take the &ubi_devices_lock. |
867 | */ |
868 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
869 | ubi = ubi_devices[i]; |
870 | if (ubi && mtd->index == ubi->mtd->index) { |
871 | pr_err("ubi: mtd%d is already attached to ubi%d\n" , |
872 | mtd->index, i); |
873 | return -EEXIST; |
874 | } |
875 | } |
876 | |
877 | /* |
878 | * Make sure this MTD device is not emulated on top of an UBI volume |
879 | * already. Well, generally this recursion works fine, but there are |
880 | * different problems like the UBI module takes a reference to itself |
881 | * by attaching (and thus, opening) the emulated MTD device. This |
882 | * results in inability to unload the module. And in general it makes |
883 | * no sense to attach emulated MTD devices, so we prohibit this. |
884 | */ |
885 | if (mtd->type == MTD_UBIVOLUME) { |
886 | pr_err("ubi: refuse attaching mtd%d - it is already emulated on top of UBI\n" , |
887 | mtd->index); |
888 | return -EINVAL; |
889 | } |
890 | |
891 | /* |
892 | * Both UBI and UBIFS have been designed for SLC NAND and NOR flashes. |
893 | * MLC NAND is different and needs special care, otherwise UBI or UBIFS |
894 | * will die soon and you will lose all your data. |
895 | * Relax this rule if the partition we're attaching to operates in SLC |
896 | * mode. |
897 | */ |
898 | if (mtd->type == MTD_MLCNANDFLASH && |
899 | !(mtd->flags & MTD_SLC_ON_MLC_EMULATION)) { |
900 | pr_err("ubi: refuse attaching mtd%d - MLC NAND is not supported\n" , |
901 | mtd->index); |
902 | return -EINVAL; |
903 | } |
904 | |
905 | /* UBI cannot work on flashes with zero erasesize. */ |
906 | if (!mtd->erasesize) { |
907 | pr_err("ubi: refuse attaching mtd%d - zero erasesize flash is not supported\n" , |
908 | mtd->index); |
909 | return -EINVAL; |
910 | } |
911 | |
912 | if (ubi_num == UBI_DEV_NUM_AUTO) { |
913 | /* Search for an empty slot in the @ubi_devices array */ |
914 | for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) |
915 | if (!ubi_devices[ubi_num]) |
916 | break; |
917 | if (ubi_num == UBI_MAX_DEVICES) { |
918 | pr_err("ubi: only %d UBI devices may be created\n" , |
919 | UBI_MAX_DEVICES); |
920 | return -ENFILE; |
921 | } |
922 | } else { |
923 | if (ubi_num >= UBI_MAX_DEVICES) |
924 | return -EINVAL; |
925 | |
926 | /* Make sure ubi_num is not busy */ |
927 | if (ubi_devices[ubi_num]) { |
928 | pr_err("ubi: ubi%i already exists\n" , ubi_num); |
929 | return -EEXIST; |
930 | } |
931 | } |
932 | |
933 | ubi = kzalloc(size: sizeof(struct ubi_device), GFP_KERNEL); |
934 | if (!ubi) |
935 | return -ENOMEM; |
936 | |
937 | device_initialize(dev: &ubi->dev); |
938 | ubi->dev.release = dev_release; |
939 | ubi->dev.class = &ubi_class; |
940 | ubi->dev.groups = ubi_dev_groups; |
941 | ubi->dev.parent = &mtd->dev; |
942 | |
943 | ubi->mtd = mtd; |
944 | ubi->ubi_num = ubi_num; |
945 | ubi->vid_hdr_offset = vid_hdr_offset; |
946 | ubi->autoresize_vol_id = -1; |
947 | |
948 | #ifdef CONFIG_MTD_UBI_FASTMAP |
949 | ubi->fm_pool.used = ubi->fm_pool.size = 0; |
950 | ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0; |
951 | |
952 | /* |
953 | * fm_pool.max_size is 5% of the total number of PEBs but it's also |
954 | * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE. |
955 | */ |
956 | ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size, |
957 | ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE); |
958 | ubi->fm_pool.max_size = max(ubi->fm_pool.max_size, |
959 | UBI_FM_MIN_POOL_SIZE); |
960 | |
961 | ubi->fm_wl_pool.max_size = ubi->fm_pool.max_size / 2; |
962 | ubi->fm_pool_rsv_cnt = need_resv_pool ? ubi->fm_pool.max_size : 0; |
963 | ubi->fm_disabled = (!fm_autoconvert || disable_fm) ? 1 : 0; |
964 | if (fm_debug) |
965 | ubi_enable_dbg_chk_fastmap(ubi); |
966 | |
967 | if (!ubi->fm_disabled && (int)mtd_div_by_eb(sz: ubi->mtd->size, mtd: ubi->mtd) |
968 | <= UBI_FM_MAX_START) { |
969 | ubi_err(ubi, fmt: "More than %i PEBs are needed for fastmap, sorry." , |
970 | UBI_FM_MAX_START); |
971 | ubi->fm_disabled = 1; |
972 | } |
973 | |
974 | ubi_msg(ubi, fmt: "default fastmap pool size: %d" , ubi->fm_pool.max_size); |
975 | ubi_msg(ubi, fmt: "default fastmap WL pool size: %d" , |
976 | ubi->fm_wl_pool.max_size); |
977 | #else |
978 | ubi->fm_disabled = 1; |
979 | #endif |
980 | mutex_init(&ubi->buf_mutex); |
981 | mutex_init(&ubi->ckvol_mutex); |
982 | mutex_init(&ubi->device_mutex); |
983 | spin_lock_init(&ubi->volumes_lock); |
984 | init_rwsem(&ubi->fm_protect); |
985 | init_rwsem(&ubi->fm_eba_sem); |
986 | |
987 | ubi_msg(ubi, fmt: "attaching mtd%d" , mtd->index); |
988 | |
989 | err = io_init(ubi, max_beb_per1024); |
990 | if (err) |
991 | goto out_free; |
992 | |
993 | err = -ENOMEM; |
994 | ubi->peb_buf = vmalloc(size: ubi->peb_size); |
995 | if (!ubi->peb_buf) |
996 | goto out_free; |
997 | |
998 | #ifdef CONFIG_MTD_UBI_FASTMAP |
999 | ubi->fm_size = ubi_calc_fm_size(ubi); |
1000 | ubi->fm_buf = vzalloc(size: ubi->fm_size); |
1001 | if (!ubi->fm_buf) |
1002 | goto out_free; |
1003 | #endif |
1004 | err = ubi_attach(ubi, force_scan: disable_fm ? 1 : 0); |
1005 | if (err) { |
1006 | ubi_err(ubi, fmt: "failed to attach mtd%d, error %d" , |
1007 | mtd->index, err); |
1008 | goto out_free; |
1009 | } |
1010 | |
1011 | if (ubi->autoresize_vol_id != -1) { |
1012 | err = autoresize(ubi, vol_id: ubi->autoresize_vol_id); |
1013 | if (err) |
1014 | goto out_detach; |
1015 | } |
1016 | |
1017 | err = uif_init(ubi); |
1018 | if (err) |
1019 | goto out_detach; |
1020 | |
1021 | err = ubi_debugfs_init_dev(ubi); |
1022 | if (err) |
1023 | goto out_uif; |
1024 | |
1025 | ubi->bgt_thread = kthread_create(ubi_thread, ubi, "%s" , ubi->bgt_name); |
1026 | if (IS_ERR(ptr: ubi->bgt_thread)) { |
1027 | err = PTR_ERR(ptr: ubi->bgt_thread); |
1028 | ubi_err(ubi, fmt: "cannot spawn \"%s\", error %d" , |
1029 | ubi->bgt_name, err); |
1030 | goto out_debugfs; |
1031 | } |
1032 | |
1033 | ubi_msg(ubi, fmt: "attached mtd%d (name \"%s\", size %llu MiB)" , |
1034 | mtd->index, mtd->name, ubi->flash_size >> 20); |
1035 | ubi_msg(ubi, fmt: "PEB size: %d bytes (%d KiB), LEB size: %d bytes" , |
1036 | ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size); |
1037 | ubi_msg(ubi, fmt: "min./max. I/O unit sizes: %d/%d, sub-page size %d" , |
1038 | ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size); |
1039 | ubi_msg(ubi, fmt: "VID header offset: %d (aligned %d), data offset: %d" , |
1040 | ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start); |
1041 | ubi_msg(ubi, fmt: "good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d" , |
1042 | ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count); |
1043 | ubi_msg(ubi, fmt: "user volume: %d, internal volumes: %d, max. volumes count: %d" , |
1044 | ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT, |
1045 | ubi->vtbl_slots); |
1046 | ubi_msg(ubi, fmt: "max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u" , |
1047 | ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD, |
1048 | ubi->image_seq); |
1049 | ubi_msg(ubi, fmt: "available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d" , |
1050 | ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs); |
1051 | |
1052 | /* |
1053 | * The below lock makes sure we do not race with 'ubi_thread()' which |
1054 | * checks @ubi->thread_enabled. Otherwise we may fail to wake it up. |
1055 | */ |
1056 | spin_lock(lock: &ubi->wl_lock); |
1057 | ubi->thread_enabled = 1; |
1058 | wake_up_process(tsk: ubi->bgt_thread); |
1059 | spin_unlock(lock: &ubi->wl_lock); |
1060 | |
1061 | ubi_devices[ubi_num] = ubi; |
1062 | ubi_notify_all(ubi, ntype: UBI_VOLUME_ADDED, NULL); |
1063 | return ubi_num; |
1064 | |
1065 | out_debugfs: |
1066 | ubi_debugfs_exit_dev(ubi); |
1067 | out_uif: |
1068 | uif_close(ubi); |
1069 | out_detach: |
1070 | ubi_wl_close(ubi); |
1071 | ubi_free_all_volumes(ubi); |
1072 | vfree(addr: ubi->vtbl); |
1073 | out_free: |
1074 | vfree(addr: ubi->peb_buf); |
1075 | vfree(addr: ubi->fm_buf); |
1076 | put_device(dev: &ubi->dev); |
1077 | return err; |
1078 | } |
1079 | |
1080 | /** |
1081 | * ubi_detach_mtd_dev - detach an MTD device. |
1082 | * @ubi_num: UBI device number to detach from |
1083 | * @anyway: detach MTD even if device reference count is not zero |
1084 | * |
1085 | * This function destroys an UBI device number @ubi_num and detaches the |
1086 | * underlying MTD device. Returns zero in case of success and %-EBUSY if the |
1087 | * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not |
1088 | * exist. |
1089 | * |
1090 | * Note, the invocations of this function has to be serialized by the |
1091 | * @ubi_devices_mutex. |
1092 | */ |
1093 | int ubi_detach_mtd_dev(int ubi_num, int anyway) |
1094 | { |
1095 | struct ubi_device *ubi; |
1096 | |
1097 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) |
1098 | return -EINVAL; |
1099 | |
1100 | ubi = ubi_get_device(ubi_num); |
1101 | if (!ubi) |
1102 | return -EINVAL; |
1103 | |
1104 | spin_lock(lock: &ubi_devices_lock); |
1105 | ubi->ref_count -= 1; |
1106 | if (ubi->ref_count) { |
1107 | if (!anyway) { |
1108 | spin_unlock(lock: &ubi_devices_lock); |
1109 | return -EBUSY; |
1110 | } |
1111 | /* This may only happen if there is a bug */ |
1112 | ubi_err(ubi, fmt: "%s reference count %d, destroy anyway" , |
1113 | ubi->ubi_name, ubi->ref_count); |
1114 | } |
1115 | ubi->is_dead = true; |
1116 | spin_unlock(lock: &ubi_devices_lock); |
1117 | |
1118 | ubi_notify_all(ubi, ntype: UBI_VOLUME_SHUTDOWN, NULL); |
1119 | |
1120 | spin_lock(lock: &ubi_devices_lock); |
1121 | put_device(dev: &ubi->dev); |
1122 | ubi_devices[ubi_num] = NULL; |
1123 | spin_unlock(lock: &ubi_devices_lock); |
1124 | |
1125 | ubi_assert(ubi_num == ubi->ubi_num); |
1126 | ubi_notify_all(ubi, ntype: UBI_VOLUME_REMOVED, NULL); |
1127 | ubi_msg(ubi, fmt: "detaching mtd%d" , ubi->mtd->index); |
1128 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1129 | /* If we don't write a new fastmap at detach time we lose all |
1130 | * EC updates that have been made since the last written fastmap. |
1131 | * In case of fastmap debugging we omit the update to simulate an |
1132 | * unclean shutdown. */ |
1133 | if (!ubi_dbg_chk_fastmap(ubi)) |
1134 | ubi_update_fastmap(ubi); |
1135 | #endif |
1136 | /* |
1137 | * Before freeing anything, we have to stop the background thread to |
1138 | * prevent it from doing anything on this device while we are freeing. |
1139 | */ |
1140 | if (ubi->bgt_thread) |
1141 | kthread_stop(k: ubi->bgt_thread); |
1142 | |
1143 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1144 | cancel_work_sync(work: &ubi->fm_work); |
1145 | #endif |
1146 | ubi_debugfs_exit_dev(ubi); |
1147 | uif_close(ubi); |
1148 | |
1149 | ubi_wl_close(ubi); |
1150 | ubi_free_internal_volumes(ubi); |
1151 | vfree(addr: ubi->vtbl); |
1152 | vfree(addr: ubi->peb_buf); |
1153 | vfree(addr: ubi->fm_buf); |
1154 | ubi_msg(ubi, fmt: "mtd%d is detached" , ubi->mtd->index); |
1155 | put_mtd_device(mtd: ubi->mtd); |
1156 | put_device(dev: &ubi->dev); |
1157 | return 0; |
1158 | } |
1159 | |
1160 | /** |
1161 | * open_mtd_by_chdev - open an MTD device by its character device node path. |
1162 | * @mtd_dev: MTD character device node path |
1163 | * |
1164 | * This helper function opens an MTD device by its character node device path. |
1165 | * Returns MTD device description object in case of success and a negative |
1166 | * error code in case of failure. |
1167 | */ |
1168 | static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) |
1169 | { |
1170 | int err, minor; |
1171 | struct path path; |
1172 | struct kstat stat; |
1173 | |
1174 | /* Probably this is an MTD character device node path */ |
1175 | err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path); |
1176 | if (err) |
1177 | return ERR_PTR(error: err); |
1178 | |
1179 | err = vfs_getattr(&path, &stat, STATX_TYPE, AT_STATX_SYNC_AS_STAT); |
1180 | path_put(&path); |
1181 | if (err) |
1182 | return ERR_PTR(error: err); |
1183 | |
1184 | /* MTD device number is defined by the major / minor numbers */ |
1185 | if (MAJOR(stat.rdev) != MTD_CHAR_MAJOR || !S_ISCHR(stat.mode)) |
1186 | return ERR_PTR(error: -EINVAL); |
1187 | |
1188 | minor = MINOR(stat.rdev); |
1189 | |
1190 | if (minor & 1) |
1191 | /* |
1192 | * Just do not think the "/dev/mtdrX" devices support is need, |
1193 | * so do not support them to avoid doing extra work. |
1194 | */ |
1195 | return ERR_PTR(error: -EINVAL); |
1196 | |
1197 | return get_mtd_device(NULL, num: minor / 2); |
1198 | } |
1199 | |
1200 | /** |
1201 | * open_mtd_device - open MTD device by name, character device path, or number. |
1202 | * @mtd_dev: name, character device node path, or MTD device device number |
1203 | * |
1204 | * This function tries to open and MTD device described by @mtd_dev string, |
1205 | * which is first treated as ASCII MTD device number, and if it is not true, it |
1206 | * is treated as MTD device name, and if that is also not true, it is treated |
1207 | * as MTD character device node path. Returns MTD device description object in |
1208 | * case of success and a negative error code in case of failure. |
1209 | */ |
1210 | static struct mtd_info * __init open_mtd_device(const char *mtd_dev) |
1211 | { |
1212 | struct mtd_info *mtd; |
1213 | int mtd_num; |
1214 | char *endp; |
1215 | |
1216 | mtd_num = simple_strtoul(mtd_dev, &endp, 0); |
1217 | if (*endp != '\0' || mtd_dev == endp) { |
1218 | /* |
1219 | * This does not look like an ASCII integer, probably this is |
1220 | * MTD device name. |
1221 | */ |
1222 | mtd = get_mtd_device_nm(name: mtd_dev); |
1223 | if (PTR_ERR(ptr: mtd) == -ENODEV) |
1224 | /* Probably this is an MTD character device node path */ |
1225 | mtd = open_mtd_by_chdev(mtd_dev); |
1226 | } else |
1227 | mtd = get_mtd_device(NULL, num: mtd_num); |
1228 | |
1229 | return mtd; |
1230 | } |
1231 | |
1232 | static void ubi_notify_add(struct mtd_info *mtd) |
1233 | { |
1234 | struct device_node *np = mtd_get_of_node(mtd); |
1235 | int err; |
1236 | |
1237 | if (!of_device_is_compatible(device: np, "linux,ubi" )) |
1238 | return; |
1239 | |
1240 | /* |
1241 | * we are already holding &mtd_table_mutex, but still need |
1242 | * to bump refcount |
1243 | */ |
1244 | err = __get_mtd_device(mtd); |
1245 | if (err) |
1246 | return; |
1247 | |
1248 | /* called while holding mtd_table_mutex */ |
1249 | mutex_lock_nested(lock: &ubi_devices_mutex, SINGLE_DEPTH_NESTING); |
1250 | err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, vid_hdr_offset: 0, max_beb_per1024: 0, disable_fm: false, need_resv_pool: false); |
1251 | mutex_unlock(lock: &ubi_devices_mutex); |
1252 | if (err < 0) |
1253 | __put_mtd_device(mtd); |
1254 | } |
1255 | |
1256 | static void ubi_notify_remove(struct mtd_info *mtd) |
1257 | { |
1258 | /* do nothing for now */ |
1259 | } |
1260 | |
1261 | static struct mtd_notifier ubi_mtd_notifier = { |
1262 | .add = ubi_notify_add, |
1263 | .remove = ubi_notify_remove, |
1264 | }; |
1265 | |
1266 | static int __init ubi_init_attach(void) |
1267 | { |
1268 | int err, i, k; |
1269 | |
1270 | /* Attach MTD devices */ |
1271 | for (i = 0; i < mtd_devs; i++) { |
1272 | struct mtd_dev_param *p = &mtd_dev_param[i]; |
1273 | struct mtd_info *mtd; |
1274 | |
1275 | cond_resched(); |
1276 | |
1277 | mtd = open_mtd_device(mtd_dev: p->name); |
1278 | if (IS_ERR(ptr: mtd)) { |
1279 | err = PTR_ERR(ptr: mtd); |
1280 | pr_err("UBI error: cannot open mtd %s, error %d\n" , |
1281 | p->name, err); |
1282 | /* See comment below re-ubi_is_module(). */ |
1283 | if (ubi_is_module()) |
1284 | goto out_detach; |
1285 | continue; |
1286 | } |
1287 | |
1288 | mutex_lock(&ubi_devices_mutex); |
1289 | err = ubi_attach_mtd_dev(mtd, ubi_num: p->ubi_num, |
1290 | vid_hdr_offset: p->vid_hdr_offs, max_beb_per1024: p->max_beb_per1024, |
1291 | disable_fm: p->enable_fm == 0, |
1292 | need_resv_pool: p->need_resv_pool != 0); |
1293 | mutex_unlock(lock: &ubi_devices_mutex); |
1294 | if (err < 0) { |
1295 | pr_err("UBI error: cannot attach mtd%d\n" , |
1296 | mtd->index); |
1297 | put_mtd_device(mtd); |
1298 | |
1299 | /* |
1300 | * Originally UBI stopped initializing on any error. |
1301 | * However, later on it was found out that this |
1302 | * behavior is not very good when UBI is compiled into |
1303 | * the kernel and the MTD devices to attach are passed |
1304 | * through the command line. Indeed, UBI failure |
1305 | * stopped whole boot sequence. |
1306 | * |
1307 | * To fix this, we changed the behavior for the |
1308 | * non-module case, but preserved the old behavior for |
1309 | * the module case, just for compatibility. This is a |
1310 | * little inconsistent, though. |
1311 | */ |
1312 | if (ubi_is_module()) |
1313 | goto out_detach; |
1314 | } |
1315 | } |
1316 | |
1317 | return 0; |
1318 | |
1319 | out_detach: |
1320 | for (k = 0; k < i; k++) |
1321 | if (ubi_devices[k]) { |
1322 | mutex_lock(&ubi_devices_mutex); |
1323 | ubi_detach_mtd_dev(ubi_num: ubi_devices[k]->ubi_num, anyway: 1); |
1324 | mutex_unlock(lock: &ubi_devices_mutex); |
1325 | } |
1326 | return err; |
1327 | } |
1328 | #ifndef CONFIG_MTD_UBI_MODULE |
1329 | late_initcall(ubi_init_attach); |
1330 | #endif |
1331 | |
1332 | static int __init ubi_init(void) |
1333 | { |
1334 | int err; |
1335 | |
1336 | /* Ensure that EC and VID headers have correct size */ |
1337 | BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64); |
1338 | BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64); |
1339 | |
1340 | if (mtd_devs > UBI_MAX_DEVICES) { |
1341 | pr_err("UBI error: too many MTD devices, maximum is %d\n" , |
1342 | UBI_MAX_DEVICES); |
1343 | return -EINVAL; |
1344 | } |
1345 | |
1346 | /* Create base sysfs directory and sysfs files */ |
1347 | err = class_register(class: &ubi_class); |
1348 | if (err < 0) |
1349 | return err; |
1350 | |
1351 | err = misc_register(misc: &ubi_ctrl_cdev); |
1352 | if (err) { |
1353 | pr_err("UBI error: cannot register device\n" ); |
1354 | goto out; |
1355 | } |
1356 | |
1357 | ubi_wl_entry_slab = kmem_cache_create(name: "ubi_wl_entry_slab" , |
1358 | size: sizeof(struct ubi_wl_entry), |
1359 | align: 0, flags: 0, NULL); |
1360 | if (!ubi_wl_entry_slab) { |
1361 | err = -ENOMEM; |
1362 | goto out_dev_unreg; |
1363 | } |
1364 | |
1365 | err = ubi_debugfs_init(); |
1366 | if (err) |
1367 | goto out_slab; |
1368 | |
1369 | err = ubiblock_init(); |
1370 | if (err) { |
1371 | pr_err("UBI error: block: cannot initialize, error %d\n" , err); |
1372 | |
1373 | /* See comment above re-ubi_is_module(). */ |
1374 | if (ubi_is_module()) |
1375 | goto out_slab; |
1376 | } |
1377 | |
1378 | register_mtd_user(new: &ubi_mtd_notifier); |
1379 | |
1380 | if (ubi_is_module()) { |
1381 | err = ubi_init_attach(); |
1382 | if (err) |
1383 | goto out_mtd_notifier; |
1384 | } |
1385 | |
1386 | return 0; |
1387 | |
1388 | out_mtd_notifier: |
1389 | unregister_mtd_user(old: &ubi_mtd_notifier); |
1390 | out_slab: |
1391 | kmem_cache_destroy(s: ubi_wl_entry_slab); |
1392 | out_dev_unreg: |
1393 | misc_deregister(misc: &ubi_ctrl_cdev); |
1394 | out: |
1395 | class_unregister(class: &ubi_class); |
1396 | pr_err("UBI error: cannot initialize UBI, error %d\n" , err); |
1397 | return err; |
1398 | } |
1399 | device_initcall(ubi_init); |
1400 | |
1401 | |
1402 | static void __exit ubi_exit(void) |
1403 | { |
1404 | int i; |
1405 | |
1406 | ubiblock_exit(); |
1407 | unregister_mtd_user(old: &ubi_mtd_notifier); |
1408 | |
1409 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
1410 | if (ubi_devices[i]) { |
1411 | mutex_lock(&ubi_devices_mutex); |
1412 | ubi_detach_mtd_dev(ubi_num: ubi_devices[i]->ubi_num, anyway: 1); |
1413 | mutex_unlock(lock: &ubi_devices_mutex); |
1414 | } |
1415 | ubi_debugfs_exit(); |
1416 | kmem_cache_destroy(s: ubi_wl_entry_slab); |
1417 | misc_deregister(misc: &ubi_ctrl_cdev); |
1418 | class_unregister(class: &ubi_class); |
1419 | } |
1420 | module_exit(ubi_exit); |
1421 | |
1422 | /** |
1423 | * bytes_str_to_int - convert a number of bytes string into an integer. |
1424 | * @str: the string to convert |
1425 | * |
1426 | * This function returns positive resulting integer in case of success and a |
1427 | * negative error code in case of failure. |
1428 | */ |
1429 | static int bytes_str_to_int(const char *str) |
1430 | { |
1431 | char *endp; |
1432 | unsigned long result; |
1433 | |
1434 | result = simple_strtoul(str, &endp, 0); |
1435 | if (str == endp || result >= INT_MAX) { |
1436 | pr_err("UBI error: incorrect bytes count: \"%s\"\n" , str); |
1437 | return -EINVAL; |
1438 | } |
1439 | |
1440 | switch (*endp) { |
1441 | case 'G': |
1442 | result *= 1024; |
1443 | fallthrough; |
1444 | case 'M': |
1445 | result *= 1024; |
1446 | fallthrough; |
1447 | case 'K': |
1448 | result *= 1024; |
1449 | break; |
1450 | case '\0': |
1451 | break; |
1452 | default: |
1453 | pr_err("UBI error: incorrect bytes count: \"%s\"\n" , str); |
1454 | return -EINVAL; |
1455 | } |
1456 | |
1457 | return result; |
1458 | } |
1459 | |
1460 | /** |
1461 | * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter. |
1462 | * @val: the parameter value to parse |
1463 | * @kp: not used |
1464 | * |
1465 | * This function returns zero in case of success and a negative error code in |
1466 | * case of error. |
1467 | */ |
1468 | static int ubi_mtd_param_parse(const char *val, const struct kernel_param *kp) |
1469 | { |
1470 | int i, len; |
1471 | struct mtd_dev_param *p; |
1472 | char buf[MTD_PARAM_LEN_MAX]; |
1473 | char *pbuf = &buf[0]; |
1474 | char *tokens[MTD_PARAM_MAX_COUNT], *token; |
1475 | |
1476 | if (!val) |
1477 | return -EINVAL; |
1478 | |
1479 | if (mtd_devs == UBI_MAX_DEVICES) { |
1480 | pr_err("UBI error: too many parameters, max. is %d\n" , |
1481 | UBI_MAX_DEVICES); |
1482 | return -EINVAL; |
1483 | } |
1484 | |
1485 | len = strnlen(p: val, MTD_PARAM_LEN_MAX); |
1486 | if (len == MTD_PARAM_LEN_MAX) { |
1487 | pr_err("UBI error: parameter \"%s\" is too long, max. is %d\n" , |
1488 | val, MTD_PARAM_LEN_MAX); |
1489 | return -EINVAL; |
1490 | } |
1491 | |
1492 | if (len == 0) { |
1493 | pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n" ); |
1494 | return 0; |
1495 | } |
1496 | |
1497 | strcpy(p: buf, q: val); |
1498 | |
1499 | /* Get rid of the final newline */ |
1500 | if (buf[len - 1] == '\n') |
1501 | buf[len - 1] = '\0'; |
1502 | |
1503 | for (i = 0; i < MTD_PARAM_MAX_COUNT; i++) |
1504 | tokens[i] = strsep(&pbuf, "," ); |
1505 | |
1506 | if (pbuf) { |
1507 | pr_err("UBI error: too many arguments at \"%s\"\n" , val); |
1508 | return -EINVAL; |
1509 | } |
1510 | |
1511 | p = &mtd_dev_param[mtd_devs]; |
1512 | strcpy(p: &p->name[0], q: tokens[0]); |
1513 | |
1514 | token = tokens[1]; |
1515 | if (token) { |
1516 | p->vid_hdr_offs = bytes_str_to_int(str: token); |
1517 | |
1518 | if (p->vid_hdr_offs < 0) |
1519 | return p->vid_hdr_offs; |
1520 | } |
1521 | |
1522 | token = tokens[2]; |
1523 | if (token) { |
1524 | int err = kstrtoint(s: token, base: 10, res: &p->max_beb_per1024); |
1525 | |
1526 | if (err) { |
1527 | pr_err("UBI error: bad value for max_beb_per1024 parameter: %s\n" , |
1528 | token); |
1529 | return -EINVAL; |
1530 | } |
1531 | } |
1532 | |
1533 | token = tokens[3]; |
1534 | if (token) { |
1535 | int err = kstrtoint(s: token, base: 10, res: &p->ubi_num); |
1536 | |
1537 | if (err) { |
1538 | pr_err("UBI error: bad value for ubi_num parameter: %s\n" , |
1539 | token); |
1540 | return -EINVAL; |
1541 | } |
1542 | } else |
1543 | p->ubi_num = UBI_DEV_NUM_AUTO; |
1544 | |
1545 | token = tokens[4]; |
1546 | if (token) { |
1547 | int err = kstrtoint(s: token, base: 10, res: &p->enable_fm); |
1548 | |
1549 | if (err) { |
1550 | pr_err("UBI error: bad value for enable_fm parameter: %s\n" , |
1551 | token); |
1552 | return -EINVAL; |
1553 | } |
1554 | } else |
1555 | p->enable_fm = 0; |
1556 | |
1557 | token = tokens[5]; |
1558 | if (token) { |
1559 | int err = kstrtoint(s: token, base: 10, res: &p->need_resv_pool); |
1560 | |
1561 | if (err) { |
1562 | pr_err("UBI error: bad value for need_resv_pool parameter: %s\n" , |
1563 | token); |
1564 | return -EINVAL; |
1565 | } |
1566 | } else |
1567 | p->need_resv_pool = 0; |
1568 | |
1569 | mtd_devs += 1; |
1570 | return 0; |
1571 | } |
1572 | |
1573 | module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 0400); |
1574 | MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024[,ubi_num]]].\n" |
1575 | "Multiple \"mtd\" parameters may be specified.\n" |
1576 | "MTD devices may be specified by their number, name, or path to the MTD character device node.\n" |
1577 | "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n" |
1578 | "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value (" |
1579 | __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n" |
1580 | "Optional \"ubi_num\" parameter specifies UBI device number which have to be assigned to the newly created UBI device (assigned automatically by default)\n" |
1581 | "Optional \"enable_fm\" parameter determines whether to enable fastmap during attach. If the value is non-zero, fastmap is enabled. Default value is 0.\n" |
1582 | "Optional \"need_resv_pool\" parameter determines whether to reserve pool->max_size pebs during attach. If the value is non-zero, peb reservation is enabled. Default value is 0.\n" |
1583 | "\n" |
1584 | "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n" |
1585 | "Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n" |
1586 | "Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n" |
1587 | "Example 4: mtd=/dev/mtd1,0,0,5 - attach MTD device /dev/mtd1 to UBI 5 and using default values for the other fields.\n" |
1588 | "example 5: mtd=1,0,0,5 mtd=2,0,0,6,1 - attach MTD device /dev/mtd1 to UBI 5 and disable fastmap; attach MTD device /dev/mtd2 to UBI 6 and enable fastmap.(only works when fastmap is enabled and fm_autoconvert=Y).\n" |
1589 | "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device)." ); |
1590 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1591 | module_param(fm_autoconvert, bool, 0644); |
1592 | MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap." ); |
1593 | module_param(fm_debug, bool, 0); |
1594 | MODULE_PARM_DESC(fm_debug, "Set this parameter to enable fastmap debugging by default. Warning, this will make fastmap slow!" ); |
1595 | #endif |
1596 | MODULE_VERSION(__stringify(UBI_VERSION)); |
1597 | MODULE_DESCRIPTION("UBI - Unsorted Block Images" ); |
1598 | MODULE_AUTHOR("Artem Bityutskiy" ); |
1599 | MODULE_LICENSE("GPL" ); |
1600 | |