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25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/sched.h>
29#include <linux/types.h>
30#include <linux/backing-dev.h>
31
32#include <linux/mtd/mtd.h>
33#include <linux/mtd/concat.h>
34
35#include <asm/div64.h>
36
37
38
39
40
41
42
43struct mtd_concat {
44 struct mtd_info mtd;
45 int num_subdev;
46 struct mtd_info **subdev;
47};
48
49
50
51
52
53#define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \
54 ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *)))
55
56
57
58
59
60#define CONCAT(x) ((struct mtd_concat *)(x))
61
62
63
64
65
66
67static int
68concat_read(struct mtd_info *mtd, loff_t from, size_t len,
69 size_t * retlen, u_char * buf)
70{
71 struct mtd_concat *concat = CONCAT(mtd);
72 int ret = 0, err;
73 int i;
74
75 *retlen = 0;
76
77 for (i = 0; i < concat->num_subdev; i++) {
78 struct mtd_info *subdev = concat->subdev[i];
79 size_t size, retsize;
80
81 if (from >= subdev->size) {
82
83 size = 0;
84 from -= subdev->size;
85 continue;
86 }
87 if (from + len > subdev->size)
88
89 size = subdev->size - from;
90 else
91
92 size = len;
93
94 err = subdev->read(subdev, from, size, &retsize, buf);
95
96
97 if (unlikely(err)) {
98 if (err == -EBADMSG) {
99 mtd->ecc_stats.failed++;
100 ret = err;
101 } else if (err == -EUCLEAN) {
102 mtd->ecc_stats.corrected++;
103
104 if (!ret)
105 ret = err;
106 } else
107 return err;
108 }
109
110 *retlen += retsize;
111 len -= size;
112 if (len == 0)
113 return ret;
114
115 buf += size;
116 from = 0;
117 }
118 return -EINVAL;
119}
120
121static int
122concat_write(struct mtd_info *mtd, loff_t to, size_t len,
123 size_t * retlen, const u_char * buf)
124{
125 struct mtd_concat *concat = CONCAT(mtd);
126 int err = -EINVAL;
127 int i;
128
129 if (!(mtd->flags & MTD_WRITEABLE))
130 return -EROFS;
131
132 *retlen = 0;
133
134 for (i = 0; i < concat->num_subdev; i++) {
135 struct mtd_info *subdev = concat->subdev[i];
136 size_t size, retsize;
137
138 if (to >= subdev->size) {
139 size = 0;
140 to -= subdev->size;
141 continue;
142 }
143 if (to + len > subdev->size)
144 size = subdev->size - to;
145 else
146 size = len;
147
148 if (!(subdev->flags & MTD_WRITEABLE))
149 err = -EROFS;
150 else
151 err = subdev->write(subdev, to, size, &retsize, buf);
152
153 if (err)
154 break;
155
156 *retlen += retsize;
157 len -= size;
158 if (len == 0)
159 break;
160
161 err = -EINVAL;
162 buf += size;
163 to = 0;
164 }
165 return err;
166}
167
168static int
169concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
170 unsigned long count, loff_t to, size_t * retlen)
171{
172 struct mtd_concat *concat = CONCAT(mtd);
173 struct kvec *vecs_copy;
174 unsigned long entry_low, entry_high;
175 size_t total_len = 0;
176 int i;
177 int err = -EINVAL;
178
179 if (!(mtd->flags & MTD_WRITEABLE))
180 return -EROFS;
181
182 *retlen = 0;
183
184
185 for (i = 0; i < count; i++)
186 total_len += vecs[i].iov_len;
187
188
189 if ((to + total_len) > mtd->size)
190 return -EINVAL;
191
192
193 if (mtd->writesize > 1) {
194 uint64_t __to = to;
195 if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize))
196 return -EINVAL;
197 }
198
199
200 vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL);
201 if (!vecs_copy)
202 return -ENOMEM;
203
204 entry_low = 0;
205 for (i = 0; i < concat->num_subdev; i++) {
206 struct mtd_info *subdev = concat->subdev[i];
207 size_t size, wsize, retsize, old_iov_len;
208
209 if (to >= subdev->size) {
210 to -= subdev->size;
211 continue;
212 }
213
214 size = min_t(uint64_t, total_len, subdev->size - to);
215 wsize = size;
216
217 entry_high = entry_low;
218 while (entry_high < count) {
219 if (size <= vecs_copy[entry_high].iov_len)
220 break;
221 size -= vecs_copy[entry_high++].iov_len;
222 }
223
224 old_iov_len = vecs_copy[entry_high].iov_len;
225 vecs_copy[entry_high].iov_len = size;
226
227 if (!(subdev->flags & MTD_WRITEABLE))
228 err = -EROFS;
229 else
230 err = subdev->writev(subdev, &vecs_copy[entry_low],
231 entry_high - entry_low + 1, to, &retsize);
232
233 vecs_copy[entry_high].iov_len = old_iov_len - size;
234 vecs_copy[entry_high].iov_base += size;
235
236 entry_low = entry_high;
237
238 if (err)
239 break;
240
241 *retlen += retsize;
242 total_len -= wsize;
243
244 if (total_len == 0)
245 break;
246
247 err = -EINVAL;
248 to = 0;
249 }
250
251 kfree(vecs_copy);
252 return err;
253}
254
255static int
256concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
257{
258 struct mtd_concat *concat = CONCAT(mtd);
259 struct mtd_oob_ops devops = *ops;
260 int i, err, ret = 0;
261
262 ops->retlen = ops->oobretlen = 0;
263
264 for (i = 0; i < concat->num_subdev; i++) {
265 struct mtd_info *subdev = concat->subdev[i];
266
267 if (from >= subdev->size) {
268 from -= subdev->size;
269 continue;
270 }
271
272
273 if (from + devops.len > subdev->size)
274 devops.len = subdev->size - from;
275
276 err = subdev->read_oob(subdev, from, &devops);
277 ops->retlen += devops.retlen;
278 ops->oobretlen += devops.oobretlen;
279
280
281 if (unlikely(err)) {
282 if (err == -EBADMSG) {
283 mtd->ecc_stats.failed++;
284 ret = err;
285 } else if (err == -EUCLEAN) {
286 mtd->ecc_stats.corrected++;
287
288 if (!ret)
289 ret = err;
290 } else
291 return err;
292 }
293
294 if (devops.datbuf) {
295 devops.len = ops->len - ops->retlen;
296 if (!devops.len)
297 return ret;
298 devops.datbuf += devops.retlen;
299 }
300 if (devops.oobbuf) {
301 devops.ooblen = ops->ooblen - ops->oobretlen;
302 if (!devops.ooblen)
303 return ret;
304 devops.oobbuf += ops->oobretlen;
305 }
306
307 from = 0;
308 }
309 return -EINVAL;
310}
311
312static int
313concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
314{
315 struct mtd_concat *concat = CONCAT(mtd);
316 struct mtd_oob_ops devops = *ops;
317 int i, err;
318
319 if (!(mtd->flags & MTD_WRITEABLE))
320 return -EROFS;
321
322 ops->retlen = 0;
323
324 for (i = 0; i < concat->num_subdev; i++) {
325 struct mtd_info *subdev = concat->subdev[i];
326
327 if (to >= subdev->size) {
328 to -= subdev->size;
329 continue;
330 }
331
332
333 if (to + devops.len > subdev->size)
334 devops.len = subdev->size - to;
335
336 err = subdev->write_oob(subdev, to, &devops);
337 ops->retlen += devops.retlen;
338 if (err)
339 return err;
340
341 if (devops.datbuf) {
342 devops.len = ops->len - ops->retlen;
343 if (!devops.len)
344 return 0;
345 devops.datbuf += devops.retlen;
346 }
347 if (devops.oobbuf) {
348 devops.ooblen = ops->ooblen - ops->oobretlen;
349 if (!devops.ooblen)
350 return 0;
351 devops.oobbuf += devops.oobretlen;
352 }
353 to = 0;
354 }
355 return -EINVAL;
356}
357
358static void concat_erase_callback(struct erase_info *instr)
359{
360 wake_up((wait_queue_head_t *) instr->priv);
361}
362
363static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase)
364{
365 int err;
366 wait_queue_head_t waitq;
367 DECLARE_WAITQUEUE(wait, current);
368
369
370
371
372 init_waitqueue_head(&waitq);
373
374 erase->mtd = mtd;
375 erase->callback = concat_erase_callback;
376 erase->priv = (unsigned long) &waitq;
377
378
379
380
381
382 err = mtd->erase(mtd, erase);
383 if (!err) {
384 set_current_state(TASK_UNINTERRUPTIBLE);
385 add_wait_queue(&waitq, &wait);
386 if (erase->state != MTD_ERASE_DONE
387 && erase->state != MTD_ERASE_FAILED)
388 schedule();
389 remove_wait_queue(&waitq, &wait);
390 set_current_state(TASK_RUNNING);
391
392 err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0;
393 }
394 return err;
395}
396
397static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
398{
399 struct mtd_concat *concat = CONCAT(mtd);
400 struct mtd_info *subdev;
401 int i, err;
402 uint64_t length, offset = 0;
403 struct erase_info *erase;
404
405 if (!(mtd->flags & MTD_WRITEABLE))
406 return -EROFS;
407
408 if (instr->addr > concat->mtd.size)
409 return -EINVAL;
410
411 if (instr->len + instr->addr > concat->mtd.size)
412 return -EINVAL;
413
414
415
416
417
418
419
420 if (!concat->mtd.numeraseregions) {
421
422 if (instr->addr & (concat->mtd.erasesize - 1))
423 return -EINVAL;
424 if (instr->len & (concat->mtd.erasesize - 1))
425 return -EINVAL;
426 } else {
427
428 struct mtd_erase_region_info *erase_regions =
429 concat->mtd.eraseregions;
430
431
432
433
434 for (i = 0; i < concat->mtd.numeraseregions &&
435 instr->addr >= erase_regions[i].offset; i++) ;
436 --i;
437
438
439
440
441
442
443 if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
444 return -EINVAL;
445
446
447
448
449 for (; i < concat->mtd.numeraseregions &&
450 (instr->addr + instr->len) >= erase_regions[i].offset;
451 ++i) ;
452 --i;
453
454
455
456 if (i < 0 || ((instr->addr + instr->len) &
457 (erase_regions[i].erasesize - 1)))
458 return -EINVAL;
459 }
460
461 instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
462
463
464 erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL);
465
466 if (!erase)
467 return -ENOMEM;
468
469 *erase = *instr;
470 length = instr->len;
471
472
473
474
475
476 for (i = 0; i < concat->num_subdev; i++) {
477 subdev = concat->subdev[i];
478 if (subdev->size <= erase->addr) {
479 erase->addr -= subdev->size;
480 offset += subdev->size;
481 } else {
482 break;
483 }
484 }
485
486
487 BUG_ON(i >= concat->num_subdev);
488
489
490 err = 0;
491 for (; length > 0; i++) {
492
493 subdev = concat->subdev[i];
494
495
496 if (erase->addr + length > subdev->size)
497 erase->len = subdev->size - erase->addr;
498 else
499 erase->len = length;
500
501 if (!(subdev->flags & MTD_WRITEABLE)) {
502 err = -EROFS;
503 break;
504 }
505 length -= erase->len;
506 if ((err = concat_dev_erase(subdev, erase))) {
507
508
509 BUG_ON(err == -EINVAL);
510 if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
511 instr->fail_addr = erase->fail_addr + offset;
512 break;
513 }
514
515
516
517
518
519
520
521
522 erase->addr = 0;
523 offset += subdev->size;
524 }
525 instr->state = erase->state;
526 kfree(erase);
527 if (err)
528 return err;
529
530 if (instr->callback)
531 instr->callback(instr);
532 return 0;
533}
534
535static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
536{
537 struct mtd_concat *concat = CONCAT(mtd);
538 int i, err = -EINVAL;
539
540 if ((len + ofs) > mtd->size)
541 return -EINVAL;
542
543 for (i = 0; i < concat->num_subdev; i++) {
544 struct mtd_info *subdev = concat->subdev[i];
545 uint64_t size;
546
547 if (ofs >= subdev->size) {
548 size = 0;
549 ofs -= subdev->size;
550 continue;
551 }
552 if (ofs + len > subdev->size)
553 size = subdev->size - ofs;
554 else
555 size = len;
556
557 if (subdev->lock) {
558 err = subdev->lock(subdev, ofs, size);
559 if (err)
560 break;
561 } else
562 err = -EOPNOTSUPP;
563
564 len -= size;
565 if (len == 0)
566 break;
567
568 err = -EINVAL;
569 ofs = 0;
570 }
571
572 return err;
573}
574
575static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
576{
577 struct mtd_concat *concat = CONCAT(mtd);
578 int i, err = 0;
579
580 if ((len + ofs) > mtd->size)
581 return -EINVAL;
582
583 for (i = 0; i < concat->num_subdev; i++) {
584 struct mtd_info *subdev = concat->subdev[i];
585 uint64_t size;
586
587 if (ofs >= subdev->size) {
588 size = 0;
589 ofs -= subdev->size;
590 continue;
591 }
592 if (ofs + len > subdev->size)
593 size = subdev->size - ofs;
594 else
595 size = len;
596
597 if (subdev->unlock) {
598 err = subdev->unlock(subdev, ofs, size);
599 if (err)
600 break;
601 } else
602 err = -EOPNOTSUPP;
603
604 len -= size;
605 if (len == 0)
606 break;
607
608 err = -EINVAL;
609 ofs = 0;
610 }
611
612 return err;
613}
614
615static void concat_sync(struct mtd_info *mtd)
616{
617 struct mtd_concat *concat = CONCAT(mtd);
618 int i;
619
620 for (i = 0; i < concat->num_subdev; i++) {
621 struct mtd_info *subdev = concat->subdev[i];
622 subdev->sync(subdev);
623 }
624}
625
626static int concat_suspend(struct mtd_info *mtd)
627{
628 struct mtd_concat *concat = CONCAT(mtd);
629 int i, rc = 0;
630
631 for (i = 0; i < concat->num_subdev; i++) {
632 struct mtd_info *subdev = concat->subdev[i];
633 if ((rc = subdev->suspend(subdev)) < 0)
634 return rc;
635 }
636 return rc;
637}
638
639static void concat_resume(struct mtd_info *mtd)
640{
641 struct mtd_concat *concat = CONCAT(mtd);
642 int i;
643
644 for (i = 0; i < concat->num_subdev; i++) {
645 struct mtd_info *subdev = concat->subdev[i];
646 subdev->resume(subdev);
647 }
648}
649
650static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs)
651{
652 struct mtd_concat *concat = CONCAT(mtd);
653 int i, res = 0;
654
655 if (!concat->subdev[0]->block_isbad)
656 return res;
657
658 if (ofs > mtd->size)
659 return -EINVAL;
660
661 for (i = 0; i < concat->num_subdev; i++) {
662 struct mtd_info *subdev = concat->subdev[i];
663
664 if (ofs >= subdev->size) {
665 ofs -= subdev->size;
666 continue;
667 }
668
669 res = subdev->block_isbad(subdev, ofs);
670 break;
671 }
672
673 return res;
674}
675
676static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
677{
678 struct mtd_concat *concat = CONCAT(mtd);
679 int i, err = -EINVAL;
680
681 if (!concat->subdev[0]->block_markbad)
682 return 0;
683
684 if (ofs > mtd->size)
685 return -EINVAL;
686
687 for (i = 0; i < concat->num_subdev; i++) {
688 struct mtd_info *subdev = concat->subdev[i];
689
690 if (ofs >= subdev->size) {
691 ofs -= subdev->size;
692 continue;
693 }
694
695 err = subdev->block_markbad(subdev, ofs);
696 if (!err)
697 mtd->ecc_stats.badblocks++;
698 break;
699 }
700
701 return err;
702}
703
704
705
706
707
708static unsigned long concat_get_unmapped_area(struct mtd_info *mtd,
709 unsigned long len,
710 unsigned long offset,
711 unsigned long flags)
712{
713 struct mtd_concat *concat = CONCAT(mtd);
714 int i;
715
716 for (i = 0; i < concat->num_subdev; i++) {
717 struct mtd_info *subdev = concat->subdev[i];
718
719 if (offset >= subdev->size) {
720 offset -= subdev->size;
721 continue;
722 }
723
724
725 if (offset + len > subdev->size)
726 return (unsigned long) -EINVAL;
727
728 if (subdev->get_unmapped_area)
729 return subdev->get_unmapped_area(subdev, len, offset,
730 flags);
731
732 break;
733 }
734
735 return (unsigned long) -ENOSYS;
736}
737
738
739
740
741
742
743
744struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],
745 int num_devs,
746 const char *name)
747{
748 int i;
749 size_t size;
750 struct mtd_concat *concat;
751 uint32_t max_erasesize, curr_erasesize;
752 int num_erase_region;
753
754 printk(KERN_NOTICE "Concatenating MTD devices:\n");
755 for (i = 0; i < num_devs; i++)
756 printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name);
757 printk(KERN_NOTICE "into device \"%s\"\n", name);
758
759
760 size = SIZEOF_STRUCT_MTD_CONCAT(num_devs);
761 concat = kzalloc(size, GFP_KERNEL);
762 if (!concat) {
763 printk
764 ("memory allocation error while creating concatenated device \"%s\"\n",
765 name);
766 return NULL;
767 }
768 concat->subdev = (struct mtd_info **) (concat + 1);
769
770
771
772
773
774 concat->mtd.type = subdev[0]->type;
775 concat->mtd.flags = subdev[0]->flags;
776 concat->mtd.size = subdev[0]->size;
777 concat->mtd.erasesize = subdev[0]->erasesize;
778 concat->mtd.writesize = subdev[0]->writesize;
779 concat->mtd.writebufsize = subdev[0]->writebufsize;
780 concat->mtd.subpage_sft = subdev[0]->subpage_sft;
781 concat->mtd.oobsize = subdev[0]->oobsize;
782 concat->mtd.oobavail = subdev[0]->oobavail;
783 if (subdev[0]->writev)
784 concat->mtd.writev = concat_writev;
785 if (subdev[0]->read_oob)
786 concat->mtd.read_oob = concat_read_oob;
787 if (subdev[0]->write_oob)
788 concat->mtd.write_oob = concat_write_oob;
789 if (subdev[0]->block_isbad)
790 concat->mtd.block_isbad = concat_block_isbad;
791 if (subdev[0]->block_markbad)
792 concat->mtd.block_markbad = concat_block_markbad;
793
794 concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks;
795
796 concat->mtd.backing_dev_info = subdev[0]->backing_dev_info;
797
798 concat->subdev[0] = subdev[0];
799
800 for (i = 1; i < num_devs; i++) {
801 if (concat->mtd.type != subdev[i]->type) {
802 kfree(concat);
803 printk("Incompatible device type on \"%s\"\n",
804 subdev[i]->name);
805 return NULL;
806 }
807 if (concat->mtd.flags != subdev[i]->flags) {
808
809
810
811
812 if ((concat->mtd.flags ^ subdev[i]->
813 flags) & ~MTD_WRITEABLE) {
814 kfree(concat);
815 printk("Incompatible device flags on \"%s\"\n",
816 subdev[i]->name);
817 return NULL;
818 } else
819
820
821 concat->mtd.flags |=
822 subdev[i]->flags & MTD_WRITEABLE;
823 }
824
825
826
827
828 if (concat->mtd.backing_dev_info !=
829 subdev[i]->backing_dev_info)
830 concat->mtd.backing_dev_info =
831 &default_backing_dev_info;
832
833 concat->mtd.size += subdev[i]->size;
834 concat->mtd.ecc_stats.badblocks +=
835 subdev[i]->ecc_stats.badblocks;
836 if (concat->mtd.writesize != subdev[i]->writesize ||
837 concat->mtd.subpage_sft != subdev[i]->subpage_sft ||
838 concat->mtd.oobsize != subdev[i]->oobsize ||
839 !concat->mtd.read_oob != !subdev[i]->read_oob ||
840 !concat->mtd.write_oob != !subdev[i]->write_oob) {
841 kfree(concat);
842 printk("Incompatible OOB or ECC data on \"%s\"\n",
843 subdev[i]->name);
844 return NULL;
845 }
846 concat->subdev[i] = subdev[i];
847
848 }
849
850 concat->mtd.ecclayout = subdev[0]->ecclayout;
851
852 concat->num_subdev = num_devs;
853 concat->mtd.name = name;
854
855 concat->mtd.erase = concat_erase;
856 concat->mtd.read = concat_read;
857 concat->mtd.write = concat_write;
858 concat->mtd.sync = concat_sync;
859 concat->mtd.lock = concat_lock;
860 concat->mtd.unlock = concat_unlock;
861 concat->mtd.suspend = concat_suspend;
862 concat->mtd.resume = concat_resume;
863 concat->mtd.get_unmapped_area = concat_get_unmapped_area;
864
865
866
867
868
869
870
871 max_erasesize = curr_erasesize = subdev[0]->erasesize;
872 num_erase_region = 1;
873 for (i = 0; i < num_devs; i++) {
874 if (subdev[i]->numeraseregions == 0) {
875
876 if (subdev[i]->erasesize != curr_erasesize) {
877
878 ++num_erase_region;
879 curr_erasesize = subdev[i]->erasesize;
880 if (curr_erasesize > max_erasesize)
881 max_erasesize = curr_erasesize;
882 }
883 } else {
884
885 int j;
886 for (j = 0; j < subdev[i]->numeraseregions; j++) {
887
888
889 if (subdev[i]->eraseregions[j].erasesize !=
890 curr_erasesize) {
891 ++num_erase_region;
892 curr_erasesize =
893 subdev[i]->eraseregions[j].
894 erasesize;
895 if (curr_erasesize > max_erasesize)
896 max_erasesize = curr_erasesize;
897 }
898 }
899 }
900 }
901
902 if (num_erase_region == 1) {
903
904
905
906
907 concat->mtd.erasesize = curr_erasesize;
908 concat->mtd.numeraseregions = 0;
909 } else {
910 uint64_t tmp64;
911
912
913
914
915
916 struct mtd_erase_region_info *erase_region_p;
917 uint64_t begin, position;
918
919 concat->mtd.erasesize = max_erasesize;
920 concat->mtd.numeraseregions = num_erase_region;
921 concat->mtd.eraseregions = erase_region_p =
922 kmalloc(num_erase_region *
923 sizeof (struct mtd_erase_region_info), GFP_KERNEL);
924 if (!erase_region_p) {
925 kfree(concat);
926 printk
927 ("memory allocation error while creating erase region list"
928 " for device \"%s\"\n", name);
929 return NULL;
930 }
931
932
933
934
935
936 curr_erasesize = subdev[0]->erasesize;
937 begin = position = 0;
938 for (i = 0; i < num_devs; i++) {
939 if (subdev[i]->numeraseregions == 0) {
940
941 if (subdev[i]->erasesize != curr_erasesize) {
942
943
944
945
946 erase_region_p->offset = begin;
947 erase_region_p->erasesize =
948 curr_erasesize;
949 tmp64 = position - begin;
950 do_div(tmp64, curr_erasesize);
951 erase_region_p->numblocks = tmp64;
952 begin = position;
953
954 curr_erasesize = subdev[i]->erasesize;
955 ++erase_region_p;
956 }
957 position += subdev[i]->size;
958 } else {
959
960 int j;
961 for (j = 0; j < subdev[i]->numeraseregions; j++) {
962
963 if (subdev[i]->eraseregions[j].
964 erasesize != curr_erasesize) {
965 erase_region_p->offset = begin;
966 erase_region_p->erasesize =
967 curr_erasesize;
968 tmp64 = position - begin;
969 do_div(tmp64, curr_erasesize);
970 erase_region_p->numblocks = tmp64;
971 begin = position;
972
973 curr_erasesize =
974 subdev[i]->eraseregions[j].
975 erasesize;
976 ++erase_region_p;
977 }
978 position +=
979 subdev[i]->eraseregions[j].
980 numblocks * (uint64_t)curr_erasesize;
981 }
982 }
983 }
984
985 erase_region_p->offset = begin;
986 erase_region_p->erasesize = curr_erasesize;
987 tmp64 = position - begin;
988 do_div(tmp64, curr_erasesize);
989 erase_region_p->numblocks = tmp64;
990 }
991
992 return &concat->mtd;
993}
994
995
996
997
998
999void mtd_concat_destroy(struct mtd_info *mtd)
1000{
1001 struct mtd_concat *concat = CONCAT(mtd);
1002 if (concat->mtd.numeraseregions)
1003 kfree(concat->mtd.eraseregions);
1004 kfree(concat);
1005}
1006
1007EXPORT_SYMBOL(mtd_concat_create);
1008EXPORT_SYMBOL(mtd_concat_destroy);
1009
1010MODULE_LICENSE("GPL");
1011MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>");
1012MODULE_DESCRIPTION("Generic support for concatenating of MTD devices");
1013