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[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / mtd / inftlmount.c
blob32e82aef3e5392550012b694e5dd58ffd71d6d1d
1 /*
2 * inftlmount.c -- INFTL mount code with extensive checks.
3 *
4 * Author: Greg Ungerer (gerg@snapgear.com)
5 * (C) Copyright 2002-2003, Greg Ungerer (gerg@snapgear.com)
6 *
7 * Based heavily on the nftlmount.c code which is:
8 * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
9 * Copyright (C) 2000 Netgem S.A.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <asm/errno.h>
29 #include <asm/io.h>
30 #include <asm/uaccess.h>
31 #include <linux/delay.h>
32 #include <linux/slab.h>
33 #include <linux/init.h>
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/nftl.h>
36 #include <linux/mtd/inftl.h>
37 #include <linux/mtd/compatmac.h>
38
39 /*
40 * find_boot_record: Find the INFTL Media Header and its Spare copy which
41 * contains the various device information of the INFTL partition and
42 * Bad Unit Table. Update the PUtable[] table according to the Bad
43 * Unit Table. PUtable[] is used for management of Erase Unit in
44 * other routines in inftlcore.c and inftlmount.c.
45 */
46 static int find_boot_record(struct INFTLrecord *inftl)
47 {
48 struct inftl_unittail h1;
49 //struct inftl_oob oob;
50 unsigned int i, block;
51 u8 buf[SECTORSIZE];
52 struct INFTLMediaHeader *mh = &inftl->MediaHdr;
53 struct mtd_info *mtd = inftl->mbd.mtd;
54 struct INFTLPartition *ip;
55 size_t retlen;
56
57 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: find_boot_record(inftl=%p)\n", inftl);
58
59 /*
60 * Assume logical EraseSize == physical erasesize for starting the
61 * scan. We'll sort it out later if we find a MediaHeader which says
62 * otherwise.
63 */
64 inftl->EraseSize = inftl->mbd.mtd->erasesize;
65 inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
66
67 inftl->MediaUnit = BLOCK_NIL;
68
69 /* Search for a valid boot record */
70 for (block = 0; block < inftl->nb_blocks; block++) {
71 int ret;
72
73 /*
74 * Check for BNAND header first. Then whinge if it's found
75 * but later checks fail.
76 */
77 ret = mtd->read(mtd, block * inftl->EraseSize,
78 SECTORSIZE, &retlen, buf);
79 /* We ignore ret in case the ECC of the MediaHeader is invalid
80 (which is apparently acceptable) */
81 if (retlen != SECTORSIZE) {
82 static int warncount = 5;
83
84 if (warncount) {
85 printk(KERN_WARNING "INFTL: block read at 0x%x "
86 "of mtd%d failed: %d\n",
87 block * inftl->EraseSize,
88 inftl->mbd.mtd->index, ret);
89 if (!--warncount)
90 printk(KERN_WARNING "INFTL: further "
91 "failures for this block will "
92 "not be printed\n");
93 }
94 continue;
95 }
96
97 if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
98 /* BNAND\0 not found. Continue */
99 continue;
100 }
101
102 /* To be safer with BIOS, also use erase mark as discriminant */
103 if ((ret = inftl_read_oob(mtd, block * inftl->EraseSize +
104 SECTORSIZE + 8, 8, &retlen,
105 (char *)&h1) < 0)) {
106 printk(KERN_WARNING "INFTL: ANAND header found at "
107 "0x%x in mtd%d, but OOB data read failed "
108 "(err %d)\n", block * inftl->EraseSize,
109 inftl->mbd.mtd->index, ret);
110 continue;
111 }
112
113
114 /*
115 * This is the first we've seen.
116 * Copy the media header structure into place.
117 */
118 memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
119
120 /* Read the spare media header at offset 4096 */
121 mtd->read(mtd, block * inftl->EraseSize + 4096,
122 SECTORSIZE, &retlen, buf);
123 if (retlen != SECTORSIZE) {
124 printk(KERN_WARNING "INFTL: Unable to read spare "
125 "Media Header\n");
126 return -1;
127 }
128 /* Check if this one is the same as the first one we found. */
129 if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
130 printk(KERN_WARNING "INFTL: Primary and spare Media "
131 "Headers disagree.\n");
132 return -1;
133 }
134
135 mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
136 mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
137 mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
138 mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
139 mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
140 mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
141
142 #ifdef CONFIG_MTD_DEBUG_VERBOSE
143 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
144 printk("INFTL: Media Header ->\n"
145 " bootRecordID = %s\n"
146 " NoOfBootImageBlocks = %d\n"
147 " NoOfBinaryPartitions = %d\n"
148 " NoOfBDTLPartitions = %d\n"
149 " BlockMultiplerBits = %d\n"
150 " FormatFlgs = %d\n"
151 " OsakVersion = 0x%x\n"
152 " PercentUsed = %d\n",
153 mh->bootRecordID, mh->NoOfBootImageBlocks,
154 mh->NoOfBinaryPartitions,
155 mh->NoOfBDTLPartitions,
156 mh->BlockMultiplierBits, mh->FormatFlags,
157 mh->OsakVersion, mh->PercentUsed);
158 }
159 #endif
160
161 if (mh->NoOfBDTLPartitions == 0) {
162 printk(KERN_WARNING "INFTL: Media Header sanity check "
163 "failed: NoOfBDTLPartitions (%d) == 0, "
164 "must be at least 1\n", mh->NoOfBDTLPartitions);
165 return -1;
166 }
167
168 if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
169 printk(KERN_WARNING "INFTL: Media Header sanity check "
170 "failed: Total Partitions (%d) > 4, "
171 "BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
172 mh->NoOfBinaryPartitions,
173 mh->NoOfBDTLPartitions,
174 mh->NoOfBinaryPartitions);
175 return -1;
176 }
177
178 if (mh->BlockMultiplierBits > 1) {
179 printk(KERN_WARNING "INFTL: sorry, we don't support "
180 "UnitSizeFactor 0x%02x\n",
181 mh->BlockMultiplierBits);
182 return -1;
183 } else if (mh->BlockMultiplierBits == 1) {
184 printk(KERN_WARNING "INFTL: support for INFTL with "
185 "UnitSizeFactor 0x%02x is experimental\n",
186 mh->BlockMultiplierBits);
187 inftl->EraseSize = inftl->mbd.mtd->erasesize <<
188 mh->BlockMultiplierBits;
189 inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
190 block >>= mh->BlockMultiplierBits;
191 }
192
193 /* Scan the partitions */
194 for (i = 0; (i < 4); i++) {
195 ip = &mh->Partitions[i];
196 ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
197 ip->firstUnit = le32_to_cpu(ip->firstUnit);
198 ip->lastUnit = le32_to_cpu(ip->lastUnit);
199 ip->flags = le32_to_cpu(ip->flags);
200 ip->spareUnits = le32_to_cpu(ip->spareUnits);
201 ip->Reserved0 = le32_to_cpu(ip->Reserved0);
202
203 #ifdef CONFIG_MTD_DEBUG_VERBOSE
204 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
205 printk(" PARTITION[%d] ->\n"
206 " virtualUnits = %d\n"
207 " firstUnit = %d\n"
208 " lastUnit = %d\n"
209 " flags = 0x%x\n"
210 " spareUnits = %d\n",
211 i, ip->virtualUnits, ip->firstUnit,
212 ip->lastUnit, ip->flags,
213 ip->spareUnits);
214 }
215 #endif
216
217 if (ip->Reserved0 != ip->firstUnit) {
218 struct erase_info *instr = &inftl->instr;
219
220 instr->mtd = inftl->mbd.mtd;
221
222 /*
223 * Most likely this is using the
224 * undocumented qiuck mount feature.
225 * We don't support that, we will need
226 * to erase the hidden block for full
227 * compatibility.
228 */
229 instr->addr = ip->Reserved0 * inftl->EraseSize;
230 instr->len = inftl->EraseSize;
231 mtd->erase(mtd, instr);
232 }
233 if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
234 printk(KERN_WARNING "INFTL: Media Header "
235 "Partition %d sanity check failed\n"
236 " firstUnit %d : lastUnit %d > "
237 "virtualUnits %d\n", i, ip->lastUnit,
238 ip->firstUnit, ip->Reserved0);
239 return -1;
240 }
241 if (ip->Reserved1 != 0) {
242 printk(KERN_WARNING "INFTL: Media Header "
243 "Partition %d sanity check failed: "
244 "Reserved1 %d != 0\n",
245 i, ip->Reserved1);
246 return -1;
247 }
248
249 if (ip->flags & INFTL_BDTL)
250 break;
251 }
252
253 if (i >= 4) {
254 printk(KERN_WARNING "INFTL: Media Header Partition "
255 "sanity check failed:\n No partition "
256 "marked as Disk Partition\n");
257 return -1;
258 }
259
260 inftl->nb_boot_blocks = ip->firstUnit;
261 inftl->numvunits = ip->virtualUnits;
262 if (inftl->numvunits > (inftl->nb_blocks -
263 inftl->nb_boot_blocks - 2)) {
264 printk(KERN_WARNING "INFTL: Media Header sanity check "
265 "failed:\n numvunits (%d) > nb_blocks "
266 "(%d) - nb_boot_blocks(%d) - 2\n",
267 inftl->numvunits, inftl->nb_blocks,
268 inftl->nb_boot_blocks);
269 return -1;
270 }
271
272 inftl->mbd.size = inftl->numvunits *
273 (inftl->EraseSize / SECTORSIZE);
274
275 /*
276 * Block count is set to last used EUN (we won't need to keep
277 * any meta-data past that point).
278 */
279 inftl->firstEUN = ip->firstUnit;
280 inftl->lastEUN = ip->lastUnit;
281 inftl->nb_blocks = ip->lastUnit + 1;
282
283 /* Memory alloc */
284 inftl->PUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
285 if (!inftl->PUtable) {
286 printk(KERN_WARNING "INFTL: allocation of PUtable "
287 "failed (%zd bytes)\n",
288 inftl->nb_blocks * sizeof(u16));
289 return -ENOMEM;
290 }
291
292 inftl->VUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
293 if (!inftl->VUtable) {
294 kfree(inftl->PUtable);
295 printk(KERN_WARNING "INFTL: allocation of VUtable "
296 "failed (%zd bytes)\n",
297 inftl->nb_blocks * sizeof(u16));
298 return -ENOMEM;
299 }
300
301 /* Mark the blocks before INFTL MediaHeader as reserved */
302 for (i = 0; i < inftl->nb_boot_blocks; i++)
303 inftl->PUtable[i] = BLOCK_RESERVED;
304 /* Mark all remaining blocks as potentially containing data */
305 for (; i < inftl->nb_blocks; i++)
306 inftl->PUtable[i] = BLOCK_NOTEXPLORED;
307
308 /* Mark this boot record (NFTL MediaHeader) block as reserved */
309 inftl->PUtable[block] = BLOCK_RESERVED;
310
311 /* Read Bad Erase Unit Table and modify PUtable[] accordingly */
312 for (i = 0; i < inftl->nb_blocks; i++) {
313 int physblock;
314 /* If any of the physical eraseblocks are bad, don't
315 use the unit. */
316 for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
317 if (inftl->mbd.mtd->block_isbad(inftl->mbd.mtd, i * inftl->EraseSize + physblock))
318 inftl->PUtable[i] = BLOCK_RESERVED;
319 }
320 }
321
322 inftl->MediaUnit = block;
323 return 0;
324 }
325
326 /* Not found. */
327 return -1;
328 }
329
330 static int memcmpb(void *a, int c, int n)
331 {
332 int i;
333 for (i = 0; i < n; i++) {
334 if (c != ((unsigned char *)a)[i])
335 return 1;
336 }
337 return 0;
338 }
339
340 /*
341 * check_free_sector: check if a free sector is actually FREE,
342 * i.e. All 0xff in data and oob area.
343 */
344 static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
345 int len, int check_oob)
346 {
347 u8 buf[SECTORSIZE + inftl->mbd.mtd->oobsize];
348 struct mtd_info *mtd = inftl->mbd.mtd;
349 size_t retlen;
350 int i;
351
352 for (i = 0; i < len; i += SECTORSIZE) {
353 if (mtd->read(mtd, address, SECTORSIZE, &retlen, buf))
354 return -1;
355 if (memcmpb(buf, 0xff, SECTORSIZE) != 0)
356 return -1;
357
358 if (check_oob) {
359 if(inftl_read_oob(mtd, address, mtd->oobsize,
360 &retlen, &buf[SECTORSIZE]) < 0)
361 return -1;
362 if (memcmpb(buf + SECTORSIZE, 0xff, mtd->oobsize) != 0)
363 return -1;
364 }
365 address += SECTORSIZE;
366 }
367
368 return 0;
369 }
370
371 /*
372 * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
373 * Unit and Update INFTL metadata. Each erase operation is
374 * checked with check_free_sectors.
375 *
376 * Return: 0 when succeed, -1 on error.
377 *
378 * ToDo: 1. Is it neceressary to check_free_sector after erasing ??
379 */
380 int INFTL_formatblock(struct INFTLrecord *inftl, int block)
381 {
382 size_t retlen;
383 struct inftl_unittail uci;
384 struct erase_info *instr = &inftl->instr;
385 struct mtd_info *mtd = inftl->mbd.mtd;
386 int physblock;
387
388 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_formatblock(inftl=%p,"
389 "block=%d)\n", inftl, block);
390
391 memset(instr, 0, sizeof(struct erase_info));
392
393 /* FIXME: Shouldn't we be setting the 'discarded' flag to zero
394 _first_? */
395
396 /* Use async erase interface, test return code */
397 instr->mtd = inftl->mbd.mtd;
398 instr->addr = block * inftl->EraseSize;
399 instr->len = inftl->mbd.mtd->erasesize;
400 /* Erase one physical eraseblock at a time, even though the NAND api
401 allows us to group them. This way we if we have a failure, we can
402 mark only the failed block in the bbt. */
403 for (physblock = 0; physblock < inftl->EraseSize;
404 physblock += instr->len, instr->addr += instr->len) {
405 mtd->erase(inftl->mbd.mtd, instr);
406
407 if (instr->state == MTD_ERASE_FAILED) {
408 printk(KERN_WARNING "INFTL: error while formatting block %d\n",
409 block);
410 goto fail;
411 }
412
413 /*
414 * Check the "freeness" of Erase Unit before updating metadata.
415 * FixMe: is this check really necessary? Since we have check
416 * the return code after the erase operation.
417 */
418 if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0)
419 goto fail;
420 }
421
422 uci.EraseMark = cpu_to_le16(ERASE_MARK);
423 uci.EraseMark1 = cpu_to_le16(ERASE_MARK);
424 uci.Reserved[0] = 0;
425 uci.Reserved[1] = 0;
426 uci.Reserved[2] = 0;
427 uci.Reserved[3] = 0;
428 instr->addr = block * inftl->EraseSize + SECTORSIZE * 2;
429 if (inftl_write_oob(mtd, instr->addr + 8, 8, &retlen, (char *)&uci) < 0)
430 goto fail;
431 return 0;
432 fail:
433 /* could not format, update the bad block table (caller is responsible
434 for setting the PUtable to BLOCK_RESERVED on failure) */
435 inftl->mbd.mtd->block_markbad(inftl->mbd.mtd, instr->addr);
436 return -1;
437 }
438
439 /*
440 * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
441 * Units in a Virtual Unit Chain, i.e. all the units are disconnected.
442 *
443 * Since the chain is invalid then we will have to erase it from its
444 * head (normally for INFTL we go from the oldest). But if it has a
445 * loop then there is no oldest...
446 */
447 static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
448 {
449 unsigned int block = first_block, block1;
450
451 printk(KERN_WARNING "INFTL: formatting chain at block %d\n",
452 first_block);
453
454 for (;;) {
455 block1 = inftl->PUtable[block];
456
457 printk(KERN_WARNING "INFTL: formatting block %d\n", block);
458 if (INFTL_formatblock(inftl, block) < 0) {
459 /*
460 * Cannot format !!!! Mark it as Bad Unit,
461 */
462 inftl->PUtable[block] = BLOCK_RESERVED;
463 } else {
464 inftl->PUtable[block] = BLOCK_FREE;
465 }
466
467 /* Goto next block on the chain */
468 block = block1;
469
470 if (block == BLOCK_NIL || block >= inftl->lastEUN)
471 break;
472 }
473 }
474
475 void INFTL_dumptables(struct INFTLrecord *s)
476 {
477 int i;
478
479 printk("-------------------------------------------"
480 "----------------------------------\n");
481
482 printk("VUtable[%d] ->", s->nb_blocks);
483 for (i = 0; i < s->nb_blocks; i++) {
484 if ((i % 8) == 0)
485 printk("\n%04x: ", i);
486 printk("%04x ", s->VUtable[i]);
487 }
488
489 printk("\n-------------------------------------------"
490 "----------------------------------\n");
491
492 printk("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks);
493 for (i = 0; i <= s->lastEUN; i++) {
494 if ((i % 8) == 0)
495 printk("\n%04x: ", i);
496 printk("%04x ", s->PUtable[i]);
497 }
498
499 printk("\n-------------------------------------------"
500 "----------------------------------\n");
501
502 printk("INFTL ->\n"
503 " EraseSize = %d\n"
504 " h/s/c = %d/%d/%d\n"
505 " numvunits = %d\n"
506 " firstEUN = %d\n"
507 " lastEUN = %d\n"
508 " numfreeEUNs = %d\n"
509 " LastFreeEUN = %d\n"
510 " nb_blocks = %d\n"
511 " nb_boot_blocks = %d",
512 s->EraseSize, s->heads, s->sectors, s->cylinders,
513 s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs,
514 s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks);
515
516 printk("\n-------------------------------------------"
517 "----------------------------------\n");
518 }
519
520 void INFTL_dumpVUchains(struct INFTLrecord *s)
521 {
522 int logical, block, i;
523
524 printk("-------------------------------------------"
525 "----------------------------------\n");
526
527 printk("INFTL Virtual Unit Chains:\n");
528 for (logical = 0; logical < s->nb_blocks; logical++) {
529 block = s->VUtable[logical];
530 if (block > s->nb_blocks)
531 continue;
532 printk(" LOGICAL %d --> %d ", logical, block);
533 for (i = 0; i < s->nb_blocks; i++) {
534 if (s->PUtable[block] == BLOCK_NIL)
535 break;
536 block = s->PUtable[block];
537 printk("%d ", block);
538 }
539 printk("\n");
540 }
541
542 printk("-------------------------------------------"
543 "----------------------------------\n");
544 }
545
546 int INFTL_mount(struct INFTLrecord *s)
547 {
548 struct mtd_info *mtd = s->mbd.mtd;
549 unsigned int block, first_block, prev_block, last_block;
550 unsigned int first_logical_block, logical_block, erase_mark;
551 int chain_length, do_format_chain;
552 struct inftl_unithead1 h0;
553 struct inftl_unittail h1;
554 size_t retlen;
555 int i;
556 u8 *ANACtable, ANAC;
557
558 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_mount(inftl=%p)\n", s);
559
560 /* Search for INFTL MediaHeader and Spare INFTL Media Header */
561 if (find_boot_record(s) < 0) {
562 printk(KERN_WARNING "INFTL: could not find valid boot record?\n");
563 return -ENXIO;
564 }
565
566 /* Init the logical to physical table */
567 for (i = 0; i < s->nb_blocks; i++)
568 s->VUtable[i] = BLOCK_NIL;
569
570 logical_block = block = BLOCK_NIL;
571
572 /* Temporary buffer to store ANAC numbers. */
573 ANACtable = kcalloc(s->nb_blocks, sizeof(u8), GFP_KERNEL);
574 if (!ANACtable) {
575 printk(KERN_WARNING "INFTL: allocation of ANACtable "
576 "failed (%zd bytes)\n",
577 s->nb_blocks * sizeof(u8));
578 return -ENOMEM;
579 }
580
581 /*
582 * First pass is to explore each physical unit, and construct the
583 * virtual chains that exist (newest physical unit goes into VUtable).
584 * Any block that is in any way invalid will be left in the
585 * NOTEXPLORED state. Then at the end we will try to format it and
586 * mark it as free.
587 */
588 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 1, explore each unit\n");
589 for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) {
590 if (s->PUtable[first_block] != BLOCK_NOTEXPLORED)
591 continue;
592
593 do_format_chain = 0;
594 first_logical_block = BLOCK_NIL;
595 last_block = BLOCK_NIL;
596 block = first_block;
597
598 for (chain_length = 0; ; chain_length++) {
599
600 if ((chain_length == 0) &&
601 (s->PUtable[block] != BLOCK_NOTEXPLORED)) {
602 /* Nothing to do here, onto next block */
603 break;
604 }
605
606 if (inftl_read_oob(mtd, block * s->EraseSize + 8,
607 8, &retlen, (char *)&h0) < 0 ||
608 inftl_read_oob(mtd, block * s->EraseSize +
609 2 * SECTORSIZE + 8, 8, &retlen,
610 (char *)&h1) < 0) {
611 /* Should never happen? */
612 do_format_chain++;
613 break;
614 }
615
616 logical_block = le16_to_cpu(h0.virtualUnitNo);
617 prev_block = le16_to_cpu(h0.prevUnitNo);
618 erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1));
619 ANACtable[block] = h0.ANAC;
620
621 /* Previous block is relative to start of Partition */
622 if (prev_block < s->nb_blocks)
623 prev_block += s->firstEUN;
624
625 /* Already explored partial chain? */
626 if (s->PUtable[block] != BLOCK_NOTEXPLORED) {
627 /* Check if chain for this logical */
628 if (logical_block == first_logical_block) {
629 if (last_block != BLOCK_NIL)
630 s->PUtable[last_block] = block;
631 }
632 break;
633 }
634
635 /* Check for invalid block */
636 if (erase_mark != ERASE_MARK) {
637 printk(KERN_WARNING "INFTL: corrupt block %d "
638 "in chain %d, chain length %d, erase "
639 "mark 0x%x?\n", block, first_block,
640 chain_length, erase_mark);
641 /*
642 * Assume end of chain, probably incomplete
643 * fold/erase...
644 */
645 if (chain_length == 0)
646 do_format_chain++;
647 break;
648 }
649
650 /* Check for it being free already then... */
651 if ((logical_block == BLOCK_FREE) ||
652 (logical_block == BLOCK_NIL)) {
653 s->PUtable[block] = BLOCK_FREE;
654 break;
655 }
656
657 /* Sanity checks on block numbers */
658 if ((logical_block >= s->nb_blocks) ||
659 ((prev_block >= s->nb_blocks) &&
660 (prev_block != BLOCK_NIL))) {
661 if (chain_length > 0) {
662 printk(KERN_WARNING "INFTL: corrupt "
663 "block %d in chain %d?\n",
664 block, first_block);
665 do_format_chain++;
666 }
667 break;
668 }
669
670 if (first_logical_block == BLOCK_NIL) {
671 first_logical_block = logical_block;
672 } else {
673 if (first_logical_block != logical_block) {
674 /* Normal for folded chain... */
675 break;
676 }
677 }
678
679 /*
680 * Current block is valid, so if we followed a virtual
681 * chain to get here then we can set the previous
682 * block pointer in our PUtable now. Then move onto
683 * the previous block in the chain.
684 */
685 s->PUtable[block] = BLOCK_NIL;
686 if (last_block != BLOCK_NIL)
687 s->PUtable[last_block] = block;
688 last_block = block;
689 block = prev_block;
690
691 /* Check for end of chain */
692 if (block == BLOCK_NIL)
693 break;
694
695 /* Validate next block before following it... */
696 if (block > s->lastEUN) {
697 printk(KERN_WARNING "INFTL: invalid previous "
698 "block %d in chain %d?\n", block,
699 first_block);
700 do_format_chain++;
701 break;
702 }
703 }
704
705 if (do_format_chain) {
706 format_chain(s, first_block);
707 continue;
708 }
709
710 /*
711 * Looks like a valid chain then. It may not really be the
712 * newest block in the chain, but it is the newest we have
713 * found so far. We might update it in later iterations of
714 * this loop if we find something newer.
715 */
716 s->VUtable[first_logical_block] = first_block;
717 logical_block = BLOCK_NIL;
718 }
719
720 #ifdef CONFIG_MTD_DEBUG_VERBOSE
721 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
722 INFTL_dumptables(s);
723 #endif
724
725 /*
726 * Second pass, check for infinite loops in chains. These are
727 * possible because we don't update the previous pointers when
728 * we fold chains. No big deal, just fix them up in PUtable.
729 */
730 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 2, validate virtual chains\n");
731 for (logical_block = 0; logical_block < s->numvunits; logical_block++) {
732 block = s->VUtable[logical_block];
733 last_block = BLOCK_NIL;
734
735 /* Check for free/reserved/nil */
736 if (block >= BLOCK_RESERVED)
737 continue;
738
739 ANAC = ANACtable[block];
740 for (i = 0; i < s->numvunits; i++) {
741 if (s->PUtable[block] == BLOCK_NIL)
742 break;
743 if (s->PUtable[block] > s->lastEUN) {
744 printk(KERN_WARNING "INFTL: invalid prev %d, "
745 "in virtual chain %d\n",
746 s->PUtable[block], logical_block);
747 s->PUtable[block] = BLOCK_NIL;
748
749 }
750 if (ANACtable[block] != ANAC) {
751 /*
752 * Chain must point back to itself. This is ok,
753 * but we will need adjust the tables with this
754 * newest block and oldest block.
755 */
756 s->VUtable[logical_block] = block;
757 s->PUtable[last_block] = BLOCK_NIL;
758 break;
759 }
760
761 ANAC--;
762 last_block = block;
763 block = s->PUtable[block];
764 }
765
766 if (i >= s->nb_blocks) {
767 /*
768 * Uhoo, infinite chain with valid ANACS!
769 * Format whole chain...
770 */
771 format_chain(s, first_block);
772 }
773 }
774
775 #ifdef CONFIG_MTD_DEBUG_VERBOSE
776 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
777 INFTL_dumptables(s);
778 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
779 INFTL_dumpVUchains(s);
780 #endif
781
782 /*
783 * Third pass, format unreferenced blocks and init free block count.
784 */
785 s->numfreeEUNs = 0;
786 s->LastFreeEUN = BLOCK_NIL;
787
788 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 3, format unused blocks\n");
789 for (block = s->firstEUN; block <= s->lastEUN; block++) {
790 if (s->PUtable[block] == BLOCK_NOTEXPLORED) {
791 printk("INFTL: unreferenced block %d, formatting it\n",
792 block);
793 if (INFTL_formatblock(s, block) < 0)
794 s->PUtable[block] = BLOCK_RESERVED;
795 else
796 s->PUtable[block] = BLOCK_FREE;
797 }
798 if (s->PUtable[block] == BLOCK_FREE) {
799 s->numfreeEUNs++;
800 if (s->LastFreeEUN == BLOCK_NIL)
801 s->LastFreeEUN = block;
802 }
803 }
804
805 kfree(ANACtable);
806 return 0;
807 }
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