1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32#include <linux/err.h>
33#include <linux/module.h>
34#include <linux/moduleparam.h>
35#include <linux/stringify.h>
36#include <linux/namei.h>
37#include <linux/stat.h>
38#include <linux/miscdevice.h>
39#include <linux/mtd/partitions.h>
40#include <linux/log2.h>
41#include <linux/kthread.h>
42#include <linux/kernel.h>
43#include <linux/slab.h>
44#include "ubi.h"
45
46
47#define MTD_PARAM_LEN_MAX 64
48
49
50#define MTD_PARAM_MAX_COUNT 3
51
52
53#define MAX_MTD_UBI_BEB_LIMIT 768
54
55#ifdef CONFIG_MTD_UBI_MODULE
56#define ubi_is_module() 1
57#else
58#define ubi_is_module() 0
59#endif
60
61
62
63
64
65
66
67
68struct mtd_dev_param {
69 char name[MTD_PARAM_LEN_MAX];
70 int vid_hdr_offs;
71 int max_beb_per1024;
72};
73
74
75static int __initdata mtd_devs;
76
77
78static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES];
79#ifdef CONFIG_MTD_UBI_FASTMAP
80
81static bool fm_autoconvert;
82#endif
83
84struct class *ubi_class;
85
86
87struct kmem_cache *ubi_wl_entry_slab;
88
89
90static struct miscdevice ubi_ctrl_cdev = {
91 .minor = MISC_DYNAMIC_MINOR,
92 .name = "ubi_ctrl",
93 .fops = &ubi_ctrl_cdev_operations,
94};
95
96
97static struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
98
99
100DEFINE_MUTEX(ubi_devices_mutex);
101
102
103static DEFINE_SPINLOCK(ubi_devices_lock);
104
105
106static ssize_t ubi_version_show(struct class *class,
107 struct class_attribute *attr, char *buf)
108{
109 return sprintf(buf, "%d\n", UBI_VERSION);
110}
111
112
113static struct class_attribute ubi_version =
114 __ATTR(version, S_IRUGO, ubi_version_show, NULL);
115
116static ssize_t dev_attribute_show(struct device *dev,
117 struct device_attribute *attr, char *buf);
118
119
120static struct device_attribute dev_eraseblock_size =
121 __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL);
122static struct device_attribute dev_avail_eraseblocks =
123 __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
124static struct device_attribute dev_total_eraseblocks =
125 __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
126static struct device_attribute dev_volumes_count =
127 __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL);
128static struct device_attribute dev_max_ec =
129 __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL);
130static struct device_attribute dev_reserved_for_bad =
131 __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL);
132static struct device_attribute dev_bad_peb_count =
133 __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL);
134static struct device_attribute dev_max_vol_count =
135 __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL);
136static struct device_attribute dev_min_io_size =
137 __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL);
138static struct device_attribute dev_bgt_enabled =
139 __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL);
140static struct device_attribute dev_mtd_num =
141 __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL);
142
143
144
145
146
147
148
149
150
151
152
153int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype)
154{
155 struct ubi_notification nt;
156
157 ubi_do_get_device_info(ubi, &nt.di);
158 ubi_do_get_volume_info(ubi, vol, &nt.vi);
159
160#ifdef CONFIG_MTD_UBI_FASTMAP
161 switch (ntype) {
162 case UBI_VOLUME_ADDED:
163 case UBI_VOLUME_REMOVED:
164 case UBI_VOLUME_RESIZED:
165 case UBI_VOLUME_RENAMED:
166 if (ubi_update_fastmap(ubi)) {
167 ubi_err("Unable to update fastmap!");
168 ubi_ro_mode(ubi);
169 }
170 }
171#endif
172 return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
173}
174
175
176
177
178
179
180
181
182
183
184
185
186int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb)
187{
188 struct ubi_notification nt;
189 int i, count = 0;
190
191 ubi_do_get_device_info(ubi, &nt.di);
192
193 mutex_lock(&ubi->device_mutex);
194 for (i = 0; i < ubi->vtbl_slots; i++) {
195
196
197
198
199
200 if (!ubi->volumes[i])
201 continue;
202
203 ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi);
204 if (nb)
205 nb->notifier_call(nb, ntype, &nt);
206 else
207 blocking_notifier_call_chain(&ubi_notifiers, ntype,
208 &nt);
209 count += 1;
210 }
211 mutex_unlock(&ubi->device_mutex);
212
213 return count;
214}
215
216
217
218
219
220
221
222
223
224
225int ubi_enumerate_volumes(struct notifier_block *nb)
226{
227 int i, count = 0;
228
229
230
231
232
233 for (i = 0; i < UBI_MAX_DEVICES; i++) {
234 struct ubi_device *ubi = ubi_devices[i];
235
236 if (!ubi)
237 continue;
238 count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb);
239 }
240
241 return count;
242}
243
244
245
246
247
248
249
250
251
252
253struct ubi_device *ubi_get_device(int ubi_num)
254{
255 struct ubi_device *ubi;
256
257 spin_lock(&ubi_devices_lock);
258 ubi = ubi_devices[ubi_num];
259 if (ubi) {
260 ubi_assert(ubi->ref_count >= 0);
261 ubi->ref_count += 1;
262 get_device(&ubi->dev);
263 }
264 spin_unlock(&ubi_devices_lock);
265
266 return ubi;
267}
268
269
270
271
272
273void ubi_put_device(struct ubi_device *ubi)
274{
275 spin_lock(&ubi_devices_lock);
276 ubi->ref_count -= 1;
277 put_device(&ubi->dev);
278 spin_unlock(&ubi_devices_lock);
279}
280
281
282
283
284
285
286
287
288struct ubi_device *ubi_get_by_major(int major)
289{
290 int i;
291 struct ubi_device *ubi;
292
293 spin_lock(&ubi_devices_lock);
294 for (i = 0; i < UBI_MAX_DEVICES; i++) {
295 ubi = ubi_devices[i];
296 if (ubi && MAJOR(ubi->cdev.dev) == major) {
297 ubi_assert(ubi->ref_count >= 0);
298 ubi->ref_count += 1;
299 get_device(&ubi->dev);
300 spin_unlock(&ubi_devices_lock);
301 return ubi;
302 }
303 }
304 spin_unlock(&ubi_devices_lock);
305
306 return NULL;
307}
308
309
310
311
312
313
314
315
316
317int ubi_major2num(int major)
318{
319 int i, ubi_num = -ENODEV;
320
321 spin_lock(&ubi_devices_lock);
322 for (i = 0; i < UBI_MAX_DEVICES; i++) {
323 struct ubi_device *ubi = ubi_devices[i];
324
325 if (ubi && MAJOR(ubi->cdev.dev) == major) {
326 ubi_num = ubi->ubi_num;
327 break;
328 }
329 }
330 spin_unlock(&ubi_devices_lock);
331
332 return ubi_num;
333}
334
335
336static ssize_t dev_attribute_show(struct device *dev,
337 struct device_attribute *attr, char *buf)
338{
339 ssize_t ret;
340 struct ubi_device *ubi;
341
342
343
344
345
346
347
348
349
350
351
352 ubi = container_of(dev, struct ubi_device, dev);
353 ubi = ubi_get_device(ubi->ubi_num);
354 if (!ubi)
355 return -ENODEV;
356
357 if (attr == &dev_eraseblock_size)
358 ret = sprintf(buf, "%d\n", ubi->leb_size);
359 else if (attr == &dev_avail_eraseblocks)
360 ret = sprintf(buf, "%d\n", ubi->avail_pebs);
361 else if (attr == &dev_total_eraseblocks)
362 ret = sprintf(buf, "%d\n", ubi->good_peb_count);
363 else if (attr == &dev_volumes_count)
364 ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT);
365 else if (attr == &dev_max_ec)
366 ret = sprintf(buf, "%d\n", ubi->max_ec);
367 else if (attr == &dev_reserved_for_bad)
368 ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs);
369 else if (attr == &dev_bad_peb_count)
370 ret = sprintf(buf, "%d\n", ubi->bad_peb_count);
371 else if (attr == &dev_max_vol_count)
372 ret = sprintf(buf, "%d\n", ubi->vtbl_slots);
373 else if (attr == &dev_min_io_size)
374 ret = sprintf(buf, "%d\n", ubi->min_io_size);
375 else if (attr == &dev_bgt_enabled)
376 ret = sprintf(buf, "%d\n", ubi->thread_enabled);
377 else if (attr == &dev_mtd_num)
378 ret = sprintf(buf, "%d\n", ubi->mtd->index);
379 else
380 ret = -EINVAL;
381
382 ubi_put_device(ubi);
383 return ret;
384}
385
386static void dev_release(struct device *dev)
387{
388 struct ubi_device *ubi = container_of(dev, struct ubi_device, dev);
389
390 kfree(ubi);
391}
392
393
394
395
396
397
398
399
400
401
402static int ubi_sysfs_init(struct ubi_device *ubi, int *ref)
403{
404 int err;
405
406 ubi->dev.release = dev_release;
407 ubi->dev.devt = ubi->cdev.dev;
408 ubi->dev.class = ubi_class;
409 dev_set_name(&ubi->dev, UBI_NAME_STR"%d", ubi->ubi_num);
410 err = device_register(&ubi->dev);
411 if (err)
412 return err;
413
414 *ref = 1;
415 err = device_create_file(&ubi->dev, &dev_eraseblock_size);
416 if (err)
417 return err;
418 err = device_create_file(&ubi->dev, &dev_avail_eraseblocks);
419 if (err)
420 return err;
421 err = device_create_file(&ubi->dev, &dev_total_eraseblocks);
422 if (err)
423 return err;
424 err = device_create_file(&ubi->dev, &dev_volumes_count);
425 if (err)
426 return err;
427 err = device_create_file(&ubi->dev, &dev_max_ec);
428 if (err)
429 return err;
430 err = device_create_file(&ubi->dev, &dev_reserved_for_bad);
431 if (err)
432 return err;
433 err = device_create_file(&ubi->dev, &dev_bad_peb_count);
434 if (err)
435 return err;
436 err = device_create_file(&ubi->dev, &dev_max_vol_count);
437 if (err)
438 return err;
439 err = device_create_file(&ubi->dev, &dev_min_io_size);
440 if (err)
441 return err;
442 err = device_create_file(&ubi->dev, &dev_bgt_enabled);
443 if (err)
444 return err;
445 err = device_create_file(&ubi->dev, &dev_mtd_num);
446 return err;
447}
448
449
450
451
452
453static void ubi_sysfs_close(struct ubi_device *ubi)
454{
455 device_remove_file(&ubi->dev, &dev_mtd_num);
456 device_remove_file(&ubi->dev, &dev_bgt_enabled);
457 device_remove_file(&ubi->dev, &dev_min_io_size);
458 device_remove_file(&ubi->dev, &dev_max_vol_count);
459 device_remove_file(&ubi->dev, &dev_bad_peb_count);
460 device_remove_file(&ubi->dev, &dev_reserved_for_bad);
461 device_remove_file(&ubi->dev, &dev_max_ec);
462 device_remove_file(&ubi->dev, &dev_volumes_count);
463 device_remove_file(&ubi->dev, &dev_total_eraseblocks);
464 device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
465 device_remove_file(&ubi->dev, &dev_eraseblock_size);
466 device_unregister(&ubi->dev);
467}
468
469
470
471
472
473static void kill_volumes(struct ubi_device *ubi)
474{
475 int i;
476
477 for (i = 0; i < ubi->vtbl_slots; i++)
478 if (ubi->volumes[i])
479 ubi_free_volume(ubi, ubi->volumes[i]);
480}
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500static int uif_init(struct ubi_device *ubi, int *ref)
501{
502 int i, err;
503 dev_t dev;
504
505 *ref = 0;
506 sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);
507
508
509
510
511
512
513
514
515
516 err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name);
517 if (err) {
518 ubi_err("cannot register UBI character devices");
519 return err;
520 }
521
522 ubi_assert(MINOR(dev) == 0);
523 cdev_init(&ubi->cdev, &ubi_cdev_operations);
524 dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev));
525 ubi->cdev.owner = THIS_MODULE;
526
527 err = cdev_add(&ubi->cdev, dev, 1);
528 if (err) {
529 ubi_err("cannot add character device");
530 goto out_unreg;
531 }
532
533 err = ubi_sysfs_init(ubi, ref);
534 if (err)
535 goto out_sysfs;
536
537 for (i = 0; i < ubi->vtbl_slots; i++)
538 if (ubi->volumes[i]) {
539 err = ubi_add_volume(ubi, ubi->volumes[i]);
540 if (err) {
541 ubi_err("cannot add volume %d", i);
542 goto out_volumes;
543 }
544 }
545
546 return 0;
547
548out_volumes:
549 kill_volumes(ubi);
550out_sysfs:
551 if (*ref)
552 get_device(&ubi->dev);
553 ubi_sysfs_close(ubi);
554 cdev_del(&ubi->cdev);
555out_unreg:
556 unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
557 ubi_err("cannot initialize UBI %s, error %d", ubi->ubi_name, err);
558 return err;
559}
560
561
562
563
564
565
566
567
568
569static void uif_close(struct ubi_device *ubi)
570{
571 kill_volumes(ubi);
572 ubi_sysfs_close(ubi);
573 cdev_del(&ubi->cdev);
574 unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
575}
576
577
578
579
580
581void ubi_free_internal_volumes(struct ubi_device *ubi)
582{
583 int i;
584
585 for (i = ubi->vtbl_slots;
586 i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
587 kfree(ubi->volumes[i]->eba_tbl);
588 kfree(ubi->volumes[i]);
589 }
590}
591
592static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024)
593{
594 int limit, device_pebs;
595 uint64_t device_size;
596
597 if (!max_beb_per1024)
598 return 0;
599
600
601
602
603
604
605
606
607
608
609 device_size = mtd_get_device_size(ubi->mtd);
610 device_pebs = mtd_div_by_eb(device_size, ubi->mtd);
611 limit = mult_frac(device_pebs, max_beb_per1024, 1024);
612
613
614 if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs)
615 limit += 1;
616
617 return limit;
618}
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636static int io_init(struct ubi_device *ubi, int max_beb_per1024)
637{
638 dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb));
639 dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry));
640
641 if (ubi->mtd->numeraseregions != 0) {
642
643
644
645
646
647
648
649
650
651 ubi_err("multiple regions, not implemented");
652 return -EINVAL;
653 }
654
655 if (ubi->vid_hdr_offset < 0)
656 return -EINVAL;
657
658
659
660
661
662
663 ubi->peb_size = ubi->mtd->erasesize;
664 ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd);
665 ubi->flash_size = ubi->mtd->size;
666
667 if (mtd_can_have_bb(ubi->mtd)) {
668 ubi->bad_allowed = 1;
669 ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024);
670 }
671
672 if (ubi->mtd->type == MTD_NORFLASH) {
673 ubi_assert(ubi->mtd->writesize == 1);
674 ubi->nor_flash = 1;
675 }
676
677 ubi->min_io_size = ubi->mtd->writesize;
678 ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft;
679
680
681
682
683
684
685 if (!is_power_of_2(ubi->min_io_size)) {
686 ubi_err("min. I/O unit (%d) is not power of 2",
687 ubi->min_io_size);
688 return -EINVAL;
689 }
690
691 ubi_assert(ubi->hdrs_min_io_size > 0);
692 ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
693 ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
694
695 ubi->max_write_size = ubi->mtd->writebufsize;
696
697
698
699
700 if (ubi->max_write_size < ubi->min_io_size ||
701 ubi->max_write_size % ubi->min_io_size ||
702 !is_power_of_2(ubi->max_write_size)) {
703 ubi_err("bad write buffer size %d for %d min. I/O unit",
704 ubi->max_write_size, ubi->min_io_size);
705 return -EINVAL;
706 }
707
708
709 ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
710 ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
711
712 dbg_gen("min_io_size %d", ubi->min_io_size);
713 dbg_gen("max_write_size %d", ubi->max_write_size);
714 dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
715 dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
716 dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
717
718 if (ubi->vid_hdr_offset == 0)
719
720 ubi->vid_hdr_offset = ubi->vid_hdr_aloffset =
721 ubi->ec_hdr_alsize;
722 else {
723 ubi->vid_hdr_aloffset = ubi->vid_hdr_offset &
724 ~(ubi->hdrs_min_io_size - 1);
725 ubi->vid_hdr_shift = ubi->vid_hdr_offset -
726 ubi->vid_hdr_aloffset;
727 }
728
729
730 ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE;
731 ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size);
732
733 dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset);
734 dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset);
735 dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift);
736 dbg_gen("leb_start %d", ubi->leb_start);
737
738
739 if (ubi->vid_hdr_shift % 4) {
740 ubi_err("unaligned VID header shift %d",
741 ubi->vid_hdr_shift);
742 return -EINVAL;
743 }
744
745
746 if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE ||
747 ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE ||
748 ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE ||
749 ubi->leb_start & (ubi->min_io_size - 1)) {
750 ubi_err("bad VID header (%d) or data offsets (%d)",
751 ubi->vid_hdr_offset, ubi->leb_start);
752 return -EINVAL;
753 }
754
755
756
757
758
759 ubi->max_erroneous = ubi->peb_count / 10;
760 if (ubi->max_erroneous < 16)
761 ubi->max_erroneous = 16;
762 dbg_gen("max_erroneous %d", ubi->max_erroneous);
763
764
765
766
767
768
769 if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) {
770 ubi_warn("EC and VID headers are in the same minimal I/O unit, switch to read-only mode");
771 ubi->ro_mode = 1;
772 }
773
774 ubi->leb_size = ubi->peb_size - ubi->leb_start;
775
776 if (!(ubi->mtd->flags & MTD_WRITEABLE)) {
777 ubi_msg("MTD device %d is write-protected, attach in read-only mode",
778 ubi->mtd->index);
779 ubi->ro_mode = 1;
780 }
781
782
783
784
785
786
787
788
789
790 return 0;
791}
792
793
794
795
796
797
798
799
800
801
802
803static int autoresize(struct ubi_device *ubi, int vol_id)
804{
805 struct ubi_volume_desc desc;
806 struct ubi_volume *vol = ubi->volumes[vol_id];
807 int err, old_reserved_pebs = vol->reserved_pebs;
808
809 if (ubi->ro_mode) {
810 ubi_warn("skip auto-resize because of R/O mode");
811 return 0;
812 }
813
814
815
816
817
818
819 ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG;
820
821 if (ubi->avail_pebs == 0) {
822 struct ubi_vtbl_record vtbl_rec;
823
824
825
826
827
828 vtbl_rec = ubi->vtbl[vol_id];
829 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
830 if (err)
831 ubi_err("cannot clean auto-resize flag for volume %d",
832 vol_id);
833 } else {
834 desc.vol = vol;
835 err = ubi_resize_volume(&desc,
836 old_reserved_pebs + ubi->avail_pebs);
837 if (err)
838 ubi_err("cannot auto-resize volume %d", vol_id);
839 }
840
841 if (err)
842 return err;
843
844 ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id,
845 vol->name, old_reserved_pebs, vol->reserved_pebs);
846 return 0;
847}
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
866 int vid_hdr_offset, int max_beb_per1024)
867{
868 struct ubi_device *ubi;
869 int i, err, ref = 0;
870
871 if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT)
872 return -EINVAL;
873
874 if (!max_beb_per1024)
875 max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT;
876
877
878
879
880
881
882
883 for (i = 0; i < UBI_MAX_DEVICES; i++) {
884 ubi = ubi_devices[i];
885 if (ubi && mtd->index == ubi->mtd->index) {
886 ubi_err("mtd%d is already attached to ubi%d",
887 mtd->index, i);
888 return -EEXIST;
889 }
890 }
891
892
893
894
895
896
897
898
899
900 if (mtd->type == MTD_UBIVOLUME) {
901 ubi_err("refuse attaching mtd%d - it is already emulated on top of UBI",
902 mtd->index);
903 return -EINVAL;
904 }
905
906 if (ubi_num == UBI_DEV_NUM_AUTO) {
907
908 for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++)
909 if (!ubi_devices[ubi_num])
910 break;
911 if (ubi_num == UBI_MAX_DEVICES) {
912 ubi_err("only %d UBI devices may be created",
913 UBI_MAX_DEVICES);
914 return -ENFILE;
915 }
916 } else {
917 if (ubi_num >= UBI_MAX_DEVICES)
918 return -EINVAL;
919
920
921 if (ubi_devices[ubi_num]) {
922 ubi_err("ubi%d already exists", ubi_num);
923 return -EEXIST;
924 }
925 }
926
927 ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL);
928 if (!ubi)
929 return -ENOMEM;
930
931 ubi->mtd = mtd;
932 ubi->ubi_num = ubi_num;
933 ubi->vid_hdr_offset = vid_hdr_offset;
934 ubi->autoresize_vol_id = -1;
935
936#ifdef CONFIG_MTD_UBI_FASTMAP
937 ubi->fm_pool.used = ubi->fm_pool.size = 0;
938 ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0;
939
940
941
942
943
944 ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size,
945 ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE);
946 if (ubi->fm_pool.max_size < UBI_FM_MIN_POOL_SIZE)
947 ubi->fm_pool.max_size = UBI_FM_MIN_POOL_SIZE;
948
949 ubi->fm_wl_pool.max_size = UBI_FM_WL_POOL_SIZE;
950 ubi->fm_disabled = !fm_autoconvert;
951
952 if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd)
953 <= UBI_FM_MAX_START) {
954 ubi_err("More than %i PEBs are needed for fastmap, sorry.",
955 UBI_FM_MAX_START);
956 ubi->fm_disabled = 1;
957 }
958
959 ubi_msg("default fastmap pool size: %d", ubi->fm_pool.max_size);
960 ubi_msg("default fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);
961#else
962 ubi->fm_disabled = 1;
963#endif
964 mutex_init(&ubi->buf_mutex);
965 mutex_init(&ubi->ckvol_mutex);
966 mutex_init(&ubi->device_mutex);
967 spin_lock_init(&ubi->volumes_lock);
968 mutex_init(&ubi->fm_mutex);
969 init_rwsem(&ubi->fm_sem);
970
971 ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
972
973 err = io_init(ubi, max_beb_per1024);
974 if (err)
975 goto out_free;
976
977 err = -ENOMEM;
978 ubi->peb_buf = vmalloc(ubi->peb_size);
979 if (!ubi->peb_buf)
980 goto out_free;
981
982#ifdef CONFIG_MTD_UBI_FASTMAP
983 ubi->fm_size = ubi_calc_fm_size(ubi);
984 ubi->fm_buf = vzalloc(ubi->fm_size);
985 if (!ubi->fm_buf)
986 goto out_free;
987#endif
988 err = ubi_attach(ubi, 0);
989 if (err) {
990 ubi_err("failed to attach mtd%d, error %d", mtd->index, err);
991 goto out_free;
992 }
993
994 if (ubi->autoresize_vol_id != -1) {
995 err = autoresize(ubi, ubi->autoresize_vol_id);
996 if (err)
997 goto out_detach;
998 }
999
1000 err = uif_init(ubi, &ref);
1001 if (err)
1002 goto out_detach;
1003
1004 err = ubi_debugfs_init_dev(ubi);
1005 if (err)
1006 goto out_uif;
1007
1008 ubi->bgt_thread = kthread_create(ubi_thread, ubi, ubi->bgt_name);
1009 if (IS_ERR(ubi->bgt_thread)) {
1010 err = PTR_ERR(ubi->bgt_thread);
1011 ubi_err("cannot spawn \"%s\", error %d", ubi->bgt_name,
1012 err);
1013 goto out_debugfs;
1014 }
1015
1016 ubi_msg("attached mtd%d (name \"%s\", size %llu MiB) to ubi%d",
1017 mtd->index, mtd->name, ubi->flash_size >> 20, ubi_num);
1018 ubi_msg("PEB size: %d bytes (%d KiB), LEB size: %d bytes",
1019 ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size);
1020 ubi_msg("min./max. I/O unit sizes: %d/%d, sub-page size %d",
1021 ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size);
1022 ubi_msg("VID header offset: %d (aligned %d), data offset: %d",
1023 ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start);
1024 ubi_msg("good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d",
1025 ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count);
1026 ubi_msg("user volume: %d, internal volumes: %d, max. volumes count: %d",
1027 ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT,
1028 ubi->vtbl_slots);
1029 ubi_msg("max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u",
1030 ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD,
1031 ubi->image_seq);
1032 ubi_msg("available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d",
1033 ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs);
1034
1035
1036
1037
1038
1039 spin_lock(&ubi->wl_lock);
1040 ubi->thread_enabled = 1;
1041 wake_up_process(ubi->bgt_thread);
1042 spin_unlock(&ubi->wl_lock);
1043
1044 ubi_devices[ubi_num] = ubi;
1045 ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL);
1046 return ubi_num;
1047
1048out_debugfs:
1049 ubi_debugfs_exit_dev(ubi);
1050out_uif:
1051 get_device(&ubi->dev);
1052 ubi_assert(ref);
1053 uif_close(ubi);
1054out_detach:
1055 ubi_wl_close(ubi);
1056 ubi_free_internal_volumes(ubi);
1057 vfree(ubi->vtbl);
1058out_free:
1059 vfree(ubi->peb_buf);
1060 vfree(ubi->fm_buf);
1061 if (ref)
1062 put_device(&ubi->dev);
1063 else
1064 kfree(ubi);
1065 return err;
1066}
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081int ubi_detach_mtd_dev(int ubi_num, int anyway)
1082{
1083 struct ubi_device *ubi;
1084
1085 if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
1086 return -EINVAL;
1087
1088 ubi = ubi_get_device(ubi_num);
1089 if (!ubi)
1090 return -EINVAL;
1091
1092 spin_lock(&ubi_devices_lock);
1093 put_device(&ubi->dev);
1094 ubi->ref_count -= 1;
1095 if (ubi->ref_count) {
1096 if (!anyway) {
1097 spin_unlock(&ubi_devices_lock);
1098 return -EBUSY;
1099 }
1100
1101 ubi_err("%s reference count %d, destroy anyway",
1102 ubi->ubi_name, ubi->ref_count);
1103 }
1104 ubi_devices[ubi_num] = NULL;
1105 spin_unlock(&ubi_devices_lock);
1106
1107 ubi_assert(ubi_num == ubi->ubi_num);
1108 ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
1109 ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
1110#ifdef CONFIG_MTD_UBI_FASTMAP
1111
1112
1113 ubi_update_fastmap(ubi);
1114#endif
1115
1116
1117
1118
1119 if (ubi->bgt_thread)
1120 kthread_stop(ubi->bgt_thread);
1121
1122
1123
1124
1125
1126 get_device(&ubi->dev);
1127
1128 ubi_debugfs_exit_dev(ubi);
1129 uif_close(ubi);
1130
1131 ubi_wl_close(ubi);
1132 ubi_free_internal_volumes(ubi);
1133 vfree(ubi->vtbl);
1134 put_mtd_device(ubi->mtd);
1135 vfree(ubi->peb_buf);
1136 vfree(ubi->fm_buf);
1137 ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
1138 put_device(&ubi->dev);
1139 return 0;
1140}
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev)
1151{
1152 int err, major, minor, mode;
1153 struct path path;
1154
1155
1156 err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path);
1157 if (err)
1158 return ERR_PTR(err);
1159
1160
1161 major = imajor(path.dentry->d_inode);
1162 minor = iminor(path.dentry->d_inode);
1163 mode = path.dentry->d_inode->i_mode;
1164 path_put(&path);
1165 if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode))
1166 return ERR_PTR(-EINVAL);
1167
1168 if (minor & 1)
1169
1170
1171
1172
1173 return ERR_PTR(-EINVAL);
1174
1175 return get_mtd_device(NULL, minor / 2);
1176}
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188static struct mtd_info * __init open_mtd_device(const char *mtd_dev)
1189{
1190 struct mtd_info *mtd;
1191 int mtd_num;
1192 char *endp;
1193
1194 mtd_num = simple_strtoul(mtd_dev, &endp, 0);
1195 if (*endp != '\0' || mtd_dev == endp) {
1196
1197
1198
1199
1200 mtd = get_mtd_device_nm(mtd_dev);
1201 if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV)
1202
1203 mtd = open_mtd_by_chdev(mtd_dev);
1204 } else
1205 mtd = get_mtd_device(NULL, mtd_num);
1206
1207 return mtd;
1208}
1209
1210static int __init ubi_init(void)
1211{
1212 int err, i, k;
1213
1214
1215 BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
1216 BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
1217
1218 if (mtd_devs > UBI_MAX_DEVICES) {
1219 ubi_err("too many MTD devices, maximum is %d", UBI_MAX_DEVICES);
1220 return -EINVAL;
1221 }
1222
1223
1224 ubi_class = class_create(THIS_MODULE, UBI_NAME_STR);
1225 if (IS_ERR(ubi_class)) {
1226 err = PTR_ERR(ubi_class);
1227 ubi_err("cannot create UBI class");
1228 goto out;
1229 }
1230
1231 err = class_create_file(ubi_class, &ubi_version);
1232 if (err) {
1233 ubi_err("cannot create sysfs file");
1234 goto out_class;
1235 }
1236
1237 err = misc_register(&ubi_ctrl_cdev);
1238 if (err) {
1239 ubi_err("cannot register device");
1240 goto out_version;
1241 }
1242
1243 ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab",
1244 sizeof(struct ubi_wl_entry),
1245 0, 0, NULL);
1246 if (!ubi_wl_entry_slab)
1247 goto out_dev_unreg;
1248
1249 err = ubi_debugfs_init();
1250 if (err)
1251 goto out_slab;
1252
1253
1254
1255 for (i = 0; i < mtd_devs; i++) {
1256 struct mtd_dev_param *p = &mtd_dev_param[i];
1257 struct mtd_info *mtd;
1258
1259 cond_resched();
1260
1261 mtd = open_mtd_device(p->name);
1262 if (IS_ERR(mtd)) {
1263 err = PTR_ERR(mtd);
1264 goto out_detach;
1265 }
1266
1267 mutex_lock(&ubi_devices_mutex);
1268 err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO,
1269 p->vid_hdr_offs, p->max_beb_per1024);
1270 mutex_unlock(&ubi_devices_mutex);
1271 if (err < 0) {
1272 ubi_err("cannot attach mtd%d", mtd->index);
1273 put_mtd_device(mtd);
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288 if (ubi_is_module())
1289 goto out_detach;
1290 }
1291 }
1292
1293 return 0;
1294
1295out_detach:
1296 for (k = 0; k < i; k++)
1297 if (ubi_devices[k]) {
1298 mutex_lock(&ubi_devices_mutex);
1299 ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1);
1300 mutex_unlock(&ubi_devices_mutex);
1301 }
1302 ubi_debugfs_exit();
1303out_slab:
1304 kmem_cache_destroy(ubi_wl_entry_slab);
1305out_dev_unreg:
1306 misc_deregister(&ubi_ctrl_cdev);
1307out_version:
1308 class_remove_file(ubi_class, &ubi_version);
1309out_class:
1310 class_destroy(ubi_class);
1311out:
1312 ubi_err("UBI error: cannot initialize UBI, error %d", err);
1313 return err;
1314}
1315late_initcall(ubi_init);
1316
1317static void __exit ubi_exit(void)
1318{
1319 int i;
1320
1321 for (i = 0; i < UBI_MAX_DEVICES; i++)
1322 if (ubi_devices[i]) {
1323 mutex_lock(&ubi_devices_mutex);
1324 ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1);
1325 mutex_unlock(&ubi_devices_mutex);
1326 }
1327 ubi_debugfs_exit();
1328 kmem_cache_destroy(ubi_wl_entry_slab);
1329 misc_deregister(&ubi_ctrl_cdev);
1330 class_remove_file(ubi_class, &ubi_version);
1331 class_destroy(ubi_class);
1332}
1333module_exit(ubi_exit);
1334
1335
1336
1337
1338
1339
1340
1341
1342static int __init bytes_str_to_int(const char *str)
1343{
1344 char *endp;
1345 unsigned long result;
1346
1347 result = simple_strtoul(str, &endp, 0);
1348 if (str == endp || result >= INT_MAX) {
1349 ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str);
1350 return -EINVAL;
1351 }
1352
1353 switch (*endp) {
1354 case 'G':
1355 result *= 1024;
1356 case 'M':
1357 result *= 1024;
1358 case 'K':
1359 result *= 1024;
1360 if (endp[1] == 'i' && endp[2] == 'B')
1361 endp += 2;
1362 case '\0':
1363 break;
1364 default:
1365 ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str);
1366 return -EINVAL;
1367 }
1368
1369 return result;
1370}
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
1381{
1382 int i, len;
1383 struct mtd_dev_param *p;
1384 char buf[MTD_PARAM_LEN_MAX];
1385 char *pbuf = &buf[0];
1386 char *tokens[MTD_PARAM_MAX_COUNT];
1387
1388 if (!val)
1389 return -EINVAL;
1390
1391 if (mtd_devs == UBI_MAX_DEVICES) {
1392 ubi_err("UBI error: too many parameters, max. is %d\n",
1393 UBI_MAX_DEVICES);
1394 return -EINVAL;
1395 }
1396
1397 len = strnlen(val, MTD_PARAM_LEN_MAX);
1398 if (len == MTD_PARAM_LEN_MAX) {
1399 ubi_err("UBI error: parameter \"%s\" is too long, max. is %d\n",
1400 val, MTD_PARAM_LEN_MAX);
1401 return -EINVAL;
1402 }
1403
1404 if (len == 0) {
1405 pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n");
1406 return 0;
1407 }
1408
1409 strcpy(buf, val);
1410
1411
1412 if (buf[len - 1] == '\n')
1413 buf[len - 1] = '\0';
1414
1415 for (i = 0; i < MTD_PARAM_MAX_COUNT; i++)
1416 tokens[i] = strsep(&pbuf, ",");
1417
1418 if (pbuf) {
1419 ubi_err("UBI error: too many arguments at \"%s\"\n", val);
1420 return -EINVAL;
1421 }
1422
1423 p = &mtd_dev_param[mtd_devs];
1424 strcpy(&p->name[0], tokens[0]);
1425
1426 if (tokens[1])
1427 p->vid_hdr_offs = bytes_str_to_int(tokens[1]);
1428
1429 if (p->vid_hdr_offs < 0)
1430 return p->vid_hdr_offs;
1431
1432 if (tokens[2]) {
1433 int err = kstrtoint(tokens[2], 10, &p->max_beb_per1024);
1434
1435 if (err) {
1436 ubi_err("UBI error: bad value for max_beb_per1024 parameter: %s",
1437 tokens[2]);
1438 return -EINVAL;
1439 }
1440 }
1441
1442 mtd_devs += 1;
1443 return 0;
1444}
1445
1446module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
1447MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024]].\n"
1448 "Multiple \"mtd\" parameters may be specified.\n"
1449 "MTD devices may be specified by their number, name, or path to the MTD character device node.\n"
1450 "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n"
1451 "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value ("
1452 __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n"
1453 "\n"
1454 "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n"
1455 "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"
1456 "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"
1457 "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
1458#ifdef CONFIG_MTD_UBI_FASTMAP
1459module_param(fm_autoconvert, bool, 0644);
1460MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap.");
1461#endif
1462MODULE_VERSION(__stringify(UBI_VERSION));
1463MODULE_DESCRIPTION("UBI - Unsorted Block Images");
1464MODULE_AUTHOR("Artem Bityutskiy");
1465MODULE_LICENSE("GPL");
1466