1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * rfd_ftl.c -- resident flash disk (flash translation layer)
4 *
5 * Copyright © 2005 Sean Young <sean@mess.org>
6 *
7 * This type of flash translation layer (FTL) is used by the Embedded BIOS
8 * by General Software. It is known as the Resident Flash Disk (RFD), see:
9 *
10 * http://www.gensw.com/pages/prod/bios/rfd.htm
11 *
12 * based on ftl.c
13 */
14
15 #include <linux/hdreg.h>
16 #include <linux/init.h>
17 #include <linux/mtd/blktrans.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/vmalloc.h>
20 #include <linux/slab.h>
21 #include <linux/jiffies.h>
22 #include <linux/module.h>
23
24 #include <asm/types.h>
25
26 static int block_size = 0;
27 module_param(block_size, int, 0);
28 MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");
29
30 #define PREFIX "rfd_ftl: "
31
32 /* This major has been assigned by device@lanana.org */
33 #ifndef RFD_FTL_MAJOR
34 #define RFD_FTL_MAJOR 256
35 #endif
36
37 /* Maximum number of partitions in an FTL region */
38 #define PART_BITS 4
39
40 /* An erase unit should start with this value */
41 #define RFD_MAGIC 0x9193
42
43 /* the second value is 0xffff or 0xffc8; function unknown */
44
45 /* the third value is always 0xffff, ignored */
46
47 /* next is an array of mapping for each corresponding sector */
48 #define HEADER_MAP_OFFSET 3
49 #define SECTOR_DELETED 0x0000
50 #define SECTOR_ZERO 0xfffe
51 #define SECTOR_FREE 0xffff
52
53 #define SECTOR_SIZE 512
54
55 #define SECTORS_PER_TRACK 63
56
57 struct block {
58 enum {
59 BLOCK_OK,
60 BLOCK_ERASING,
61 BLOCK_ERASED,
62 BLOCK_UNUSED,
63 BLOCK_FAILED
64 } state;
65 int free_sectors;
66 int used_sectors;
67 int erases;
68 u_long offset;
69 };
70
71 struct partition {
72 struct mtd_blktrans_dev mbd;
73
74 u_int block_size; /* size of erase unit */
75 u_int total_blocks; /* number of erase units */
76 u_int header_sectors_per_block; /* header sectors in erase unit */
77 u_int data_sectors_per_block; /* data sectors in erase unit */
78 u_int sector_count; /* sectors in translated disk */
79 u_int header_size; /* bytes in header sector */
80 int reserved_block; /* block next up for reclaim */
81 int current_block; /* block to write to */
82 u16 *header_cache; /* cached header */
83
84 int is_reclaiming;
85 int cylinders;
86 int errors;
87 u_long *sector_map;
88 struct block *blocks;
89 };
90
91 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf);
92
build_block_map(struct partition * part,int block_no)93 static int build_block_map(struct partition *part, int block_no)
94 {
95 struct block *block = &part->blocks[block_no];
96 int i;
97
98 block->offset = part->block_size * block_no;
99
100 if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) {
101 block->state = BLOCK_UNUSED;
102 return -ENOENT;
103 }
104
105 block->state = BLOCK_OK;
106
107 for (i=0; i<part->data_sectors_per_block; i++) {
108 u16 entry;
109
110 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
111
112 if (entry == SECTOR_DELETED)
113 continue;
114
115 if (entry == SECTOR_FREE) {
116 block->free_sectors++;
117 continue;
118 }
119
120 if (entry == SECTOR_ZERO)
121 entry = 0;
122
123 if (entry >= part->sector_count) {
124 printk(KERN_WARNING PREFIX
125 "'%s': unit #%d: entry %d corrupt, "
126 "sector %d out of range\n",
127 part->mbd.mtd->name, block_no, i, entry);
128 continue;
129 }
130
131 if (part->sector_map[entry] != -1) {
132 printk(KERN_WARNING PREFIX
133 "'%s': more than one entry for sector %d\n",
134 part->mbd.mtd->name, entry);
135 part->errors = 1;
136 continue;
137 }
138
139 part->sector_map[entry] = block->offset +
140 (i + part->header_sectors_per_block) * SECTOR_SIZE;
141
142 block->used_sectors++;
143 }
144
145 if (block->free_sectors == part->data_sectors_per_block)
146 part->reserved_block = block_no;
147
148 return 0;
149 }
150
scan_header(struct partition * part)151 static int scan_header(struct partition *part)
152 {
153 int sectors_per_block;
154 int i, rc = -ENOMEM;
155 int blocks_found;
156 size_t retlen;
157
158 sectors_per_block = part->block_size / SECTOR_SIZE;
159 part->total_blocks = (u32)part->mbd.mtd->size / part->block_size;
160
161 if (part->total_blocks < 2)
162 return -ENOENT;
163
164 /* each erase block has three bytes header, followed by the map */
165 part->header_sectors_per_block =
166 ((HEADER_MAP_OFFSET + sectors_per_block) *
167 sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
168
169 part->data_sectors_per_block = sectors_per_block -
170 part->header_sectors_per_block;
171
172 part->header_size = (HEADER_MAP_OFFSET +
173 part->data_sectors_per_block) * sizeof(u16);
174
175 part->cylinders = (part->data_sectors_per_block *
176 (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
177
178 part->sector_count = part->cylinders * SECTORS_PER_TRACK;
179
180 part->current_block = -1;
181 part->reserved_block = -1;
182 part->is_reclaiming = 0;
183
184 part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
185 if (!part->header_cache)
186 goto err;
187
188 part->blocks = kzalloc_objs(struct block, part->total_blocks);
189 if (!part->blocks)
190 goto err;
191
192 part->sector_map = vmalloc_array(part->sector_count,
193 sizeof(u_long));
194 if (!part->sector_map)
195 goto err;
196
197 for (i=0; i<part->sector_count; i++)
198 part->sector_map[i] = -1;
199
200 for (i=0, blocks_found=0; i<part->total_blocks; i++) {
201 rc = mtd_read(part->mbd.mtd, i * part->block_size,
202 part->header_size, &retlen,
203 (u_char *)part->header_cache);
204
205 if (!rc && retlen != part->header_size)
206 rc = -EIO;
207
208 if (rc)
209 goto err;
210
211 if (!build_block_map(part, i))
212 blocks_found++;
213 }
214
215 if (blocks_found == 0) {
216 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
217 part->mbd.mtd->name);
218 rc = -ENOENT;
219 goto err;
220 }
221
222 if (part->reserved_block == -1) {
223 printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n",
224 part->mbd.mtd->name);
225
226 part->errors = 1;
227 }
228
229 return 0;
230
231 err:
232 vfree(part->sector_map);
233 kfree(part->header_cache);
234 kfree(part->blocks);
235
236 return rc;
237 }
238
rfd_ftl_readsect(struct mtd_blktrans_dev * dev,u_long sector,char * buf)239 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
240 {
241 struct partition *part = container_of(dev, struct partition, mbd);
242 u_long addr;
243 size_t retlen;
244 int rc;
245
246 if (sector >= part->sector_count)
247 return -EIO;
248
249 addr = part->sector_map[sector];
250 if (addr != -1) {
251 rc = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
252 (u_char *)buf);
253 if (!rc && retlen != SECTOR_SIZE)
254 rc = -EIO;
255
256 if (rc) {
257 printk(KERN_WARNING PREFIX "error reading '%s' at "
258 "0x%lx\n", part->mbd.mtd->name, addr);
259 return rc;
260 }
261 } else
262 memset(buf, 0, SECTOR_SIZE);
263
264 return 0;
265 }
266
erase_block(struct partition * part,int block)267 static int erase_block(struct partition *part, int block)
268 {
269 struct erase_info *erase;
270 int rc;
271
272 erase = kmalloc_obj(struct erase_info);
273 if (!erase)
274 return -ENOMEM;
275
276 erase->addr = part->blocks[block].offset;
277 erase->len = part->block_size;
278
279 part->blocks[block].state = BLOCK_ERASING;
280 part->blocks[block].free_sectors = 0;
281
282 rc = mtd_erase(part->mbd.mtd, erase);
283 if (rc) {
284 printk(KERN_ERR PREFIX "erase of region %llx,%llx on '%s' "
285 "failed\n", (unsigned long long)erase->addr,
286 (unsigned long long)erase->len, part->mbd.mtd->name);
287 part->blocks[block].state = BLOCK_FAILED;
288 part->blocks[block].free_sectors = 0;
289 part->blocks[block].used_sectors = 0;
290 } else {
291 u16 magic = cpu_to_le16(RFD_MAGIC);
292 size_t retlen;
293
294 part->blocks[block].state = BLOCK_ERASED;
295 part->blocks[block].free_sectors = part->data_sectors_per_block;
296 part->blocks[block].used_sectors = 0;
297 part->blocks[block].erases++;
298
299 rc = mtd_write(part->mbd.mtd, part->blocks[block].offset,
300 sizeof(magic), &retlen, (u_char *)&magic);
301 if (!rc && retlen != sizeof(magic))
302 rc = -EIO;
303
304 if (rc) {
305 pr_err(PREFIX "'%s': unable to write RFD header at 0x%lx\n",
306 part->mbd.mtd->name, part->blocks[block].offset);
307 part->blocks[block].state = BLOCK_FAILED;
308 } else {
309 part->blocks[block].state = BLOCK_OK;
310 }
311 }
312
313 kfree(erase);
314
315 return rc;
316 }
317
move_block_contents(struct partition * part,int block_no,u_long * old_sector)318 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
319 {
320 void *sector_data;
321 u16 *map;
322 size_t retlen;
323 int i, rc = -ENOMEM;
324
325 part->is_reclaiming = 1;
326
327 sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
328 if (!sector_data)
329 goto err3;
330
331 map = kmalloc(part->header_size, GFP_KERNEL);
332 if (!map)
333 goto err2;
334
335 rc = mtd_read(part->mbd.mtd, part->blocks[block_no].offset,
336 part->header_size, &retlen, (u_char *)map);
337
338 if (!rc && retlen != part->header_size)
339 rc = -EIO;
340
341 if (rc) {
342 printk(KERN_ERR PREFIX "error reading '%s' at "
343 "0x%lx\n", part->mbd.mtd->name,
344 part->blocks[block_no].offset);
345
346 goto err;
347 }
348
349 for (i=0; i<part->data_sectors_per_block; i++) {
350 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
351 u_long addr;
352
353
354 if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
355 continue;
356
357 if (entry == SECTOR_ZERO)
358 entry = 0;
359
360 /* already warned about and ignored in build_block_map() */
361 if (entry >= part->sector_count)
362 continue;
363
364 addr = part->blocks[block_no].offset +
365 (i + part->header_sectors_per_block) * SECTOR_SIZE;
366
367 if (*old_sector == addr) {
368 *old_sector = -1;
369 if (!part->blocks[block_no].used_sectors--) {
370 rc = erase_block(part, block_no);
371 break;
372 }
373 continue;
374 }
375 rc = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
376 sector_data);
377
378 if (!rc && retlen != SECTOR_SIZE)
379 rc = -EIO;
380
381 if (rc) {
382 printk(KERN_ERR PREFIX "'%s': Unable to "
383 "read sector for relocation\n",
384 part->mbd.mtd->name);
385
386 goto err;
387 }
388
389 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
390 entry, sector_data);
391
392 if (rc)
393 goto err;
394 }
395
396 err:
397 kfree(map);
398 err2:
399 kfree(sector_data);
400 err3:
401 part->is_reclaiming = 0;
402
403 return rc;
404 }
405
reclaim_block(struct partition * part,u_long * old_sector)406 static int reclaim_block(struct partition *part, u_long *old_sector)
407 {
408 int block, best_block, score, old_sector_block;
409 int rc;
410
411 /* we have a race if sync doesn't exist */
412 mtd_sync(part->mbd.mtd);
413
414 score = 0x7fffffff; /* MAX_INT */
415 best_block = -1;
416 if (*old_sector != -1)
417 old_sector_block = *old_sector / part->block_size;
418 else
419 old_sector_block = -1;
420
421 for (block=0; block<part->total_blocks; block++) {
422 int this_score;
423
424 if (block == part->reserved_block)
425 continue;
426
427 /*
428 * Postpone reclaiming if there is a free sector as
429 * more removed sectors is more efficient (have to move
430 * less).
431 */
432 if (part->blocks[block].free_sectors)
433 return 0;
434
435 this_score = part->blocks[block].used_sectors;
436
437 if (block == old_sector_block)
438 this_score--;
439 else {
440 /* no point in moving a full block */
441 if (part->blocks[block].used_sectors ==
442 part->data_sectors_per_block)
443 continue;
444 }
445
446 this_score += part->blocks[block].erases;
447
448 if (this_score < score) {
449 best_block = block;
450 score = this_score;
451 }
452 }
453
454 if (best_block == -1)
455 return -ENOSPC;
456
457 part->current_block = -1;
458 part->reserved_block = best_block;
459
460 pr_debug("reclaim_block: reclaiming block #%d with %d used "
461 "%d free sectors\n", best_block,
462 part->blocks[best_block].used_sectors,
463 part->blocks[best_block].free_sectors);
464
465 if (part->blocks[best_block].used_sectors)
466 rc = move_block_contents(part, best_block, old_sector);
467 else
468 rc = erase_block(part, best_block);
469
470 return rc;
471 }
472
473 /*
474 * IMPROVE: It would be best to choose the block with the most deleted sectors,
475 * because if we fill that one up first it'll have the most chance of having
476 * the least live sectors at reclaim.
477 */
find_free_block(struct partition * part)478 static int find_free_block(struct partition *part)
479 {
480 int block, stop;
481
482 block = part->current_block == -1 ?
483 jiffies % part->total_blocks : part->current_block;
484 stop = block;
485
486 do {
487 if (part->blocks[block].free_sectors &&
488 block != part->reserved_block)
489 return block;
490
491 if (part->blocks[block].state == BLOCK_UNUSED)
492 erase_block(part, block);
493
494 if (++block >= part->total_blocks)
495 block = 0;
496
497 } while (block != stop);
498
499 return -1;
500 }
501
find_writable_block(struct partition * part,u_long * old_sector)502 static int find_writable_block(struct partition *part, u_long *old_sector)
503 {
504 int rc, block;
505 size_t retlen;
506
507 block = find_free_block(part);
508
509 if (block == -1) {
510 if (!part->is_reclaiming) {
511 rc = reclaim_block(part, old_sector);
512 if (rc)
513 goto err;
514
515 block = find_free_block(part);
516 }
517
518 if (block == -1) {
519 rc = -ENOSPC;
520 goto err;
521 }
522 }
523
524 rc = mtd_read(part->mbd.mtd, part->blocks[block].offset,
525 part->header_size, &retlen,
526 (u_char *)part->header_cache);
527
528 if (!rc && retlen != part->header_size)
529 rc = -EIO;
530
531 if (rc) {
532 printk(KERN_ERR PREFIX "'%s': unable to read header at "
533 "0x%lx\n", part->mbd.mtd->name,
534 part->blocks[block].offset);
535 goto err;
536 }
537
538 part->current_block = block;
539
540 err:
541 return rc;
542 }
543
mark_sector_deleted(struct partition * part,u_long old_addr)544 static int mark_sector_deleted(struct partition *part, u_long old_addr)
545 {
546 int block, offset, rc;
547 u_long addr;
548 size_t retlen;
549 u16 del = cpu_to_le16(SECTOR_DELETED);
550
551 block = old_addr / part->block_size;
552 offset = (old_addr % part->block_size) / SECTOR_SIZE -
553 part->header_sectors_per_block;
554
555 addr = part->blocks[block].offset +
556 (HEADER_MAP_OFFSET + offset) * sizeof(u16);
557 rc = mtd_write(part->mbd.mtd, addr, sizeof(del), &retlen,
558 (u_char *)&del);
559
560 if (!rc && retlen != sizeof(del))
561 rc = -EIO;
562
563 if (rc) {
564 printk(KERN_ERR PREFIX "error writing '%s' at "
565 "0x%lx\n", part->mbd.mtd->name, addr);
566 goto err;
567 }
568 if (block == part->current_block)
569 part->header_cache[offset + HEADER_MAP_OFFSET] = del;
570
571 part->blocks[block].used_sectors--;
572
573 if (!part->blocks[block].used_sectors &&
574 !part->blocks[block].free_sectors)
575 rc = erase_block(part, block);
576
577 err:
578 return rc;
579 }
580
find_free_sector(const struct partition * part,const struct block * block)581 static int find_free_sector(const struct partition *part, const struct block *block)
582 {
583 int i, stop;
584
585 i = stop = part->data_sectors_per_block - block->free_sectors;
586
587 do {
588 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i])
589 == SECTOR_FREE)
590 return i;
591
592 if (++i == part->data_sectors_per_block)
593 i = 0;
594 }
595 while(i != stop);
596
597 return -1;
598 }
599
do_writesect(struct mtd_blktrans_dev * dev,u_long sector,char * buf,ulong * old_addr)600 static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr)
601 {
602 struct partition *part = container_of(dev, struct partition, mbd);
603 struct block *block;
604 u_long addr;
605 int i;
606 int rc;
607 size_t retlen;
608 u16 entry;
609
610 if (part->current_block == -1 ||
611 !part->blocks[part->current_block].free_sectors) {
612
613 rc = find_writable_block(part, old_addr);
614 if (rc)
615 goto err;
616 }
617
618 block = &part->blocks[part->current_block];
619
620 i = find_free_sector(part, block);
621
622 if (i < 0) {
623 rc = -ENOSPC;
624 goto err;
625 }
626
627 addr = (i + part->header_sectors_per_block) * SECTOR_SIZE +
628 block->offset;
629 rc = mtd_write(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
630 (u_char *)buf);
631
632 if (!rc && retlen != SECTOR_SIZE)
633 rc = -EIO;
634
635 if (rc) {
636 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
637 part->mbd.mtd->name, addr);
638 goto err;
639 }
640
641 part->sector_map[sector] = addr;
642
643 entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector);
644
645 part->header_cache[i + HEADER_MAP_OFFSET] = entry;
646
647 addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16);
648 rc = mtd_write(part->mbd.mtd, addr, sizeof(entry), &retlen,
649 (u_char *)&entry);
650
651 if (!rc && retlen != sizeof(entry))
652 rc = -EIO;
653
654 if (rc) {
655 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
656 part->mbd.mtd->name, addr);
657 goto err;
658 }
659 block->used_sectors++;
660 block->free_sectors--;
661
662 err:
663 return rc;
664 }
665
rfd_ftl_writesect(struct mtd_blktrans_dev * dev,u_long sector,char * buf)666 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
667 {
668 struct partition *part = container_of(dev, struct partition, mbd);
669 u_long old_addr;
670 int i;
671 int rc = 0;
672
673 pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector);
674
675 if (part->reserved_block == -1) {
676 rc = -EACCES;
677 goto err;
678 }
679
680 if (sector >= part->sector_count) {
681 rc = -EIO;
682 goto err;
683 }
684
685 old_addr = part->sector_map[sector];
686
687 for (i=0; i<SECTOR_SIZE; i++) {
688 if (!buf[i])
689 continue;
690
691 rc = do_writesect(dev, sector, buf, &old_addr);
692 if (rc)
693 goto err;
694 break;
695 }
696
697 if (i == SECTOR_SIZE)
698 part->sector_map[sector] = -1;
699
700 if (old_addr != -1)
701 rc = mark_sector_deleted(part, old_addr);
702
703 err:
704 return rc;
705 }
706
rfd_ftl_discardsect(struct mtd_blktrans_dev * dev,unsigned long sector,unsigned int nr_sects)707 static int rfd_ftl_discardsect(struct mtd_blktrans_dev *dev,
708 unsigned long sector, unsigned int nr_sects)
709 {
710 struct partition *part = container_of(dev, struct partition, mbd);
711 u_long addr;
712 int rc;
713
714 while (nr_sects) {
715 if (sector >= part->sector_count)
716 return -EIO;
717
718 addr = part->sector_map[sector];
719
720 if (addr != -1) {
721 rc = mark_sector_deleted(part, addr);
722 if (rc)
723 return rc;
724
725 part->sector_map[sector] = -1;
726 }
727
728 sector++;
729 nr_sects--;
730 }
731
732 return 0;
733 }
734
rfd_ftl_getgeo(struct mtd_blktrans_dev * dev,struct hd_geometry * geo)735 static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
736 {
737 struct partition *part = container_of(dev, struct partition, mbd);
738
739 geo->heads = 1;
740 geo->sectors = SECTORS_PER_TRACK;
741 geo->cylinders = part->cylinders;
742
743 return 0;
744 }
745
rfd_ftl_add_mtd(struct mtd_blktrans_ops * tr,struct mtd_info * mtd)746 static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
747 {
748 struct partition *part;
749
750 if ((mtd->type != MTD_NORFLASH && mtd->type != MTD_RAM) ||
751 mtd->size > UINT_MAX)
752 return;
753
754 part = kzalloc_obj(struct partition);
755 if (!part)
756 return;
757
758 part->mbd.mtd = mtd;
759
760 if (block_size)
761 part->block_size = block_size;
762 else {
763 if (!mtd->erasesize) {
764 printk(KERN_WARNING PREFIX "please provide block_size");
765 goto out;
766 } else
767 part->block_size = mtd->erasesize;
768 }
769
770 if (scan_header(part) == 0) {
771 part->mbd.size = part->sector_count;
772 part->mbd.tr = tr;
773 part->mbd.devnum = -1;
774 if (!(mtd->flags & MTD_WRITEABLE))
775 part->mbd.readonly = 1;
776 else if (part->errors) {
777 printk(KERN_WARNING PREFIX "'%s': errors found, "
778 "setting read-only\n", mtd->name);
779 part->mbd.readonly = 1;
780 }
781
782 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
783 mtd->name, mtd->type, mtd->flags);
784
785 if (!add_mtd_blktrans_dev(&part->mbd))
786 return;
787 }
788 out:
789 kfree(part);
790 }
791
rfd_ftl_remove_dev(struct mtd_blktrans_dev * dev)792 static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
793 {
794 struct partition *part = container_of(dev, struct partition, mbd);
795 int i;
796
797 for (i=0; i<part->total_blocks; i++) {
798 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n",
799 part->mbd.mtd->name, i, part->blocks[i].erases);
800 }
801
802 vfree(part->sector_map);
803 kfree(part->header_cache);
804 kfree(part->blocks);
805 del_mtd_blktrans_dev(&part->mbd);
806 }
807
808 static struct mtd_blktrans_ops rfd_ftl_tr = {
809 .name = "rfd",
810 .major = RFD_FTL_MAJOR,
811 .part_bits = PART_BITS,
812 .blksize = SECTOR_SIZE,
813
814 .readsect = rfd_ftl_readsect,
815 .writesect = rfd_ftl_writesect,
816 .discard = rfd_ftl_discardsect,
817 .getgeo = rfd_ftl_getgeo,
818 .add_mtd = rfd_ftl_add_mtd,
819 .remove_dev = rfd_ftl_remove_dev,
820 .owner = THIS_MODULE,
821 };
822
823 module_mtd_blktrans(rfd_ftl_tr);
824
825 MODULE_LICENSE("GPL");
826 MODULE_AUTHOR("Sean Young <sean@mess.org>");
827 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
828 "used by General Software's Embedded BIOS");
829
830