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[SK_BUFF]: Introduce skb_transport_offset()
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / mtd / inftlmount.c
blobacf3ba223298e2ff06ba79a769bd1a8ffb7a7911
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 * $Id: inftlmount.c,v 1.18 2005/11/07 11:14:20 gleixner Exp $
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 */
27
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <asm/errno.h>
31 #include <asm/io.h>
32 #include <asm/uaccess.h>
33 #include <linux/miscdevice.h>
34 #include <linux/pci.h>
35 #include <linux/delay.h>
36 #include <linux/slab.h>
37 #include <linux/init.h>
38 #include <linux/mtd/mtd.h>
39 #include <linux/mtd/nftl.h>
40 #include <linux/mtd/inftl.h>
41 #include <linux/mtd/compatmac.h>
42
43 char inftlmountrev[]="$Revision: 1.18 $";
44
45 extern int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
46 size_t *retlen, uint8_t *buf);
47 extern int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
48 size_t *retlen, uint8_t *buf);
49
50 /*
51 * find_boot_record: Find the INFTL Media Header and its Spare copy which
52 * contains the various device information of the INFTL partition and
53 * Bad Unit Table. Update the PUtable[] table according to the Bad
54 * Unit Table. PUtable[] is used for management of Erase Unit in
55 * other routines in inftlcore.c and inftlmount.c.
56 */
57 static int find_boot_record(struct INFTLrecord *inftl)
58 {
59 struct inftl_unittail h1;
60 //struct inftl_oob oob;
61 unsigned int i, block;
62 u8 buf[SECTORSIZE];
63 struct INFTLMediaHeader *mh = &inftl->MediaHdr;
64 struct mtd_info *mtd = inftl->mbd.mtd;
65 struct INFTLPartition *ip;
66 size_t retlen;
67
68 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: find_boot_record(inftl=%p)\n", inftl);
69
70 /*
71 * Assume logical EraseSize == physical erasesize for starting the
72 * scan. We'll sort it out later if we find a MediaHeader which says
73 * otherwise.
74 */
75 inftl->EraseSize = inftl->mbd.mtd->erasesize;
76 inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
77
78 inftl->MediaUnit = BLOCK_NIL;
79
80 /* Search for a valid boot record */
81 for (block = 0; block < inftl->nb_blocks; block++) {
82 int ret;
83
84 /*
85 * Check for BNAND header first. Then whinge if it's found
86 * but later checks fail.
87 */
88 ret = mtd->read(mtd, block * inftl->EraseSize,
89 SECTORSIZE, &retlen, buf);
90 /* We ignore ret in case the ECC of the MediaHeader is invalid
91 (which is apparently acceptable) */
92 if (retlen != SECTORSIZE) {
93 static int warncount = 5;
94
95 if (warncount) {
96 printk(KERN_WARNING "INFTL: block read at 0x%x "
97 "of mtd%d failed: %d\n",
98 block * inftl->EraseSize,
99 inftl->mbd.mtd->index, ret);
100 if (!--warncount)
101 printk(KERN_WARNING "INFTL: further "
102 "failures for this block will "
103 "not be printed\n");
104 }
105 continue;
106 }
107
108 if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
109 /* BNAND\0 not found. Continue */
110 continue;
111 }
112
113 /* To be safer with BIOS, also use erase mark as discriminant */
114 if ((ret = inftl_read_oob(mtd, block * inftl->EraseSize +
115 SECTORSIZE + 8, 8, &retlen,
116 (char *)&h1) < 0)) {
117 printk(KERN_WARNING "INFTL: ANAND header found at "
118 "0x%x in mtd%d, but OOB data read failed "
119 "(err %d)\n", block * inftl->EraseSize,
120 inftl->mbd.mtd->index, ret);
121 continue;
122 }
123
124
125 /*
126 * This is the first we've seen.
127 * Copy the media header structure into place.
128 */
129 memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
130
131 /* Read the spare media header at offset 4096 */
132 mtd->read(mtd, block * inftl->EraseSize + 4096,
133 SECTORSIZE, &retlen, buf);
134 if (retlen != SECTORSIZE) {
135 printk(KERN_WARNING "INFTL: Unable to read spare "
136 "Media Header\n");
137 return -1;
138 }
139 /* Check if this one is the same as the first one we found. */
140 if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
141 printk(KERN_WARNING "INFTL: Primary and spare Media "
142 "Headers disagree.\n");
143 return -1;
144 }
145
146 mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
147 mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
148 mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
149 mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
150 mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
151 mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
152
153 #ifdef CONFIG_MTD_DEBUG_VERBOSE
154 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
155 printk("INFTL: Media Header ->\n"
156 " bootRecordID = %s\n"
157 " NoOfBootImageBlocks = %d\n"
158 " NoOfBinaryPartitions = %d\n"
159 " NoOfBDTLPartitions = %d\n"
160 " BlockMultiplerBits = %d\n"
161 " FormatFlgs = %d\n"
162 " OsakVersion = 0x%x\n"
163 " PercentUsed = %d\n",
164 mh->bootRecordID, mh->NoOfBootImageBlocks,
165 mh->NoOfBinaryPartitions,
166 mh->NoOfBDTLPartitions,
167 mh->BlockMultiplierBits, mh->FormatFlags,
168 mh->OsakVersion, mh->PercentUsed);
169 }
170 #endif
171
172 if (mh->NoOfBDTLPartitions == 0) {
173 printk(KERN_WARNING "INFTL: Media Header sanity check "
174 "failed: NoOfBDTLPartitions (%d) == 0, "
175 "must be at least 1\n", mh->NoOfBDTLPartitions);
176 return -1;
177 }
178
179 if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
180 printk(KERN_WARNING "INFTL: Media Header sanity check "
181 "failed: Total Partitions (%d) > 4, "
182 "BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
183 mh->NoOfBinaryPartitions,
184 mh->NoOfBDTLPartitions,
185 mh->NoOfBinaryPartitions);
186 return -1;
187 }
188
189 if (mh->BlockMultiplierBits > 1) {
190 printk(KERN_WARNING "INFTL: sorry, we don't support "
191 "UnitSizeFactor 0x%02x\n",
192 mh->BlockMultiplierBits);
193 return -1;
194 } else if (mh->BlockMultiplierBits == 1) {
195 printk(KERN_WARNING "INFTL: support for INFTL with "
196 "UnitSizeFactor 0x%02x is experimental\n",
197 mh->BlockMultiplierBits);
198 inftl->EraseSize = inftl->mbd.mtd->erasesize <<
199 mh->BlockMultiplierBits;
200 inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
201 block >>= mh->BlockMultiplierBits;
202 }
203
204 /* Scan the partitions */
205 for (i = 0; (i < 4); i++) {
206 ip = &mh->Partitions[i];
207 ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
208 ip->firstUnit = le32_to_cpu(ip->firstUnit);
209 ip->lastUnit = le32_to_cpu(ip->lastUnit);
210 ip->flags = le32_to_cpu(ip->flags);
211 ip->spareUnits = le32_to_cpu(ip->spareUnits);
212 ip->Reserved0 = le32_to_cpu(ip->Reserved0);
213
214 #ifdef CONFIG_MTD_DEBUG_VERBOSE
215 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
216 printk(" PARTITION[%d] ->\n"
217 " virtualUnits = %d\n"
218 " firstUnit = %d\n"
219 " lastUnit = %d\n"
220 " flags = 0x%x\n"
221 " spareUnits = %d\n",
222 i, ip->virtualUnits, ip->firstUnit,
223 ip->lastUnit, ip->flags,
224 ip->spareUnits);
225 }
226 #endif
227
228 if (ip->Reserved0 != ip->firstUnit) {
229 struct erase_info *instr = &inftl->instr;
230
231 instr->mtd = inftl->mbd.mtd;
232
233 /*
234 * Most likely this is using the
235 * undocumented qiuck mount feature.
236 * We don't support that, we will need
237 * to erase the hidden block for full
238 * compatibility.
239 */
240 instr->addr = ip->Reserved0 * inftl->EraseSize;
241 instr->len = inftl->EraseSize;
242 mtd->erase(mtd, instr);
243 }
244 if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
245 printk(KERN_WARNING "INFTL: Media Header "
246 "Partition %d sanity check failed\n"
247 " firstUnit %d : lastUnit %d > "
248 "virtualUnits %d\n", i, ip->lastUnit,
249 ip->firstUnit, ip->Reserved0);
250 return -1;
251 }
252 if (ip->Reserved1 != 0) {
253 printk(KERN_WARNING "INFTL: Media Header "
254 "Partition %d sanity check failed: "
255 "Reserved1 %d != 0\n",
256 i, ip->Reserved1);
257 return -1;
258 }
259
260 if (ip->flags & INFTL_BDTL)
261 break;
262 }
263
264 if (i >= 4) {
265 printk(KERN_WARNING "INFTL: Media Header Partition "
266 "sanity check failed:\n No partition "
267 "marked as Disk Partition\n");
268 return -1;
269 }
270
271 inftl->nb_boot_blocks = ip->firstUnit;
272 inftl->numvunits = ip->virtualUnits;
273 if (inftl->numvunits > (inftl->nb_blocks -
274 inftl->nb_boot_blocks - 2)) {
275 printk(KERN_WARNING "INFTL: Media Header sanity check "
276 "failed:\n numvunits (%d) > nb_blocks "
277 "(%d) - nb_boot_blocks(%d) - 2\n",
278 inftl->numvunits, inftl->nb_blocks,
279 inftl->nb_boot_blocks);
280 return -1;
281 }
282
283 inftl->mbd.size = inftl->numvunits *
284 (inftl->EraseSize / SECTORSIZE);
285
286 /*
287 * Block count is set to last used EUN (we won't need to keep
288 * any meta-data past that point).
289 */
290 inftl->firstEUN = ip->firstUnit;
291 inftl->lastEUN = ip->lastUnit;
292 inftl->nb_blocks = ip->lastUnit + 1;
293
294 /* Memory alloc */
295 inftl->PUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
296 if (!inftl->PUtable) {
297 printk(KERN_WARNING "INFTL: allocation of PUtable "
298 "failed (%zd bytes)\n",
299 inftl->nb_blocks * sizeof(u16));
300 return -ENOMEM;
301 }
302
303 inftl->VUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
304 if (!inftl->VUtable) {
305 kfree(inftl->PUtable);
306 printk(KERN_WARNING "INFTL: allocation of VUtable "
307 "failed (%zd bytes)\n",
308 inftl->nb_blocks * sizeof(u16));
309 return -ENOMEM;
310 }
311
312 /* Mark the blocks before INFTL MediaHeader as reserved */
313 for (i = 0; i < inftl->nb_boot_blocks; i++)
314 inftl->PUtable[i] = BLOCK_RESERVED;
315 /* Mark all remaining blocks as potentially containing data */
316 for (; i < inftl->nb_blocks; i++)
317 inftl->PUtable[i] = BLOCK_NOTEXPLORED;
318
319 /* Mark this boot record (NFTL MediaHeader) block as reserved */
320 inftl->PUtable[block] = BLOCK_RESERVED;
321
322 /* Read Bad Erase Unit Table and modify PUtable[] accordingly */
323 for (i = 0; i < inftl->nb_blocks; i++) {
324 int physblock;
325 /* If any of the physical eraseblocks are bad, don't
326 use the unit. */
327 for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
328 if (inftl->mbd.mtd->block_isbad(inftl->mbd.mtd, i * inftl->EraseSize + physblock))
329 inftl->PUtable[i] = BLOCK_RESERVED;
330 }
331 }
332
333 inftl->MediaUnit = block;
334 return 0;
335 }
336
337 /* Not found. */
338 return -1;
339 }
340
341 static int memcmpb(void *a, int c, int n)
342 {
343 int i;
344 for (i = 0; i < n; i++) {
345 if (c != ((unsigned char *)a)[i])
346 return 1;
347 }
348 return 0;
349 }
350
351 /*
352 * check_free_sector: check if a free sector is actually FREE,
353 * i.e. All 0xff in data and oob area.
354 */
355 static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
356 int len, int check_oob)
357 {
358 u8 buf[SECTORSIZE + inftl->mbd.mtd->oobsize];
359 struct mtd_info *mtd = inftl->mbd.mtd;
360 size_t retlen;
361 int i;
362
363 for (i = 0; i < len; i += SECTORSIZE) {
364 if (mtd->read(mtd, address, SECTORSIZE, &retlen, buf))
365 return -1;
366 if (memcmpb(buf, 0xff, SECTORSIZE) != 0)
367 return -1;
368
369 if (check_oob) {
370 if(inftl_read_oob(mtd, address, mtd->oobsize,
371 &retlen, &buf[SECTORSIZE]) < 0)
372 return -1;
373 if (memcmpb(buf + SECTORSIZE, 0xff, mtd->oobsize) != 0)
374 return -1;
375 }
376 address += SECTORSIZE;
377 }
378
379 return 0;
380 }
381
382 /*
383 * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
384 * Unit and Update INFTL metadata. Each erase operation is
385 * checked with check_free_sectors.
386 *
387 * Return: 0 when succeed, -1 on error.
388 *
389 * ToDo: 1. Is it neceressary to check_free_sector after erasing ??
390 */
391 int INFTL_formatblock(struct INFTLrecord *inftl, int block)
392 {
393 size_t retlen;
394 struct inftl_unittail uci;
395 struct erase_info *instr = &inftl->instr;
396 struct mtd_info *mtd = inftl->mbd.mtd;
397 int physblock;
398
399 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_formatblock(inftl=%p,"
400 "block=%d)\n", inftl, block);
401
402 memset(instr, 0, sizeof(struct erase_info));
403
404 /* FIXME: Shouldn't we be setting the 'discarded' flag to zero
405 _first_? */
406
407 /* Use async erase interface, test return code */
408 instr->mtd = inftl->mbd.mtd;
409 instr->addr = block * inftl->EraseSize;
410 instr->len = inftl->mbd.mtd->erasesize;
411 /* Erase one physical eraseblock at a time, even though the NAND api
412 allows us to group them. This way we if we have a failure, we can
413 mark only the failed block in the bbt. */
414 for (physblock = 0; physblock < inftl->EraseSize;
415 physblock += instr->len, instr->addr += instr->len) {
416 mtd->erase(inftl->mbd.mtd, instr);
417
418 if (instr->state == MTD_ERASE_FAILED) {
419 printk(KERN_WARNING "INFTL: error while formatting block %d\n",
420 block);
421 goto fail;
422 }
423
424 /*
425 * Check the "freeness" of Erase Unit before updating metadata.
426 * FixMe: is this check really necessary? Since we have check
427 * the return code after the erase operation.
428 */
429 if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0)
430 goto fail;
431 }
432
433 uci.EraseMark = cpu_to_le16(ERASE_MARK);
434 uci.EraseMark1 = cpu_to_le16(ERASE_MARK);
435 uci.Reserved[0] = 0;
436 uci.Reserved[1] = 0;
437 uci.Reserved[2] = 0;
438 uci.Reserved[3] = 0;
439 instr->addr = block * inftl->EraseSize + SECTORSIZE * 2;
440 if (inftl_write_oob(mtd, instr->addr + 8, 8, &retlen, (char *)&uci) < 0)
441 goto fail;
442 return 0;
443 fail:
444 /* could not format, update the bad block table (caller is responsible
445 for setting the PUtable to BLOCK_RESERVED on failure) */
446 inftl->mbd.mtd->block_markbad(inftl->mbd.mtd, instr->addr);
447 return -1;
448 }
449
450 /*
451 * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
452 * Units in a Virtual Unit Chain, i.e. all the units are disconnected.
453 *
454 * Since the chain is invalid then we will have to erase it from its
455 * head (normally for INFTL we go from the oldest). But if it has a
456 * loop then there is no oldest...
457 */
458 static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
459 {
460 unsigned int block = first_block, block1;
461
462 printk(KERN_WARNING "INFTL: formatting chain at block %d\n",
463 first_block);
464
465 for (;;) {
466 block1 = inftl->PUtable[block];
467
468 printk(KERN_WARNING "INFTL: formatting block %d\n", block);
469 if (INFTL_formatblock(inftl, block) < 0) {
470 /*
471 * Cannot format !!!! Mark it as Bad Unit,
472 */
473 inftl->PUtable[block] = BLOCK_RESERVED;
474 } else {
475 inftl->PUtable[block] = BLOCK_FREE;
476 }
477
478 /* Goto next block on the chain */
479 block = block1;
480
481 if (block == BLOCK_NIL || block >= inftl->lastEUN)
482 break;
483 }
484 }
485
486 void INFTL_dumptables(struct INFTLrecord *s)
487 {
488 int i;
489
490 printk("-------------------------------------------"
491 "----------------------------------\n");
492
493 printk("VUtable[%d] ->", s->nb_blocks);
494 for (i = 0; i < s->nb_blocks; i++) {
495 if ((i % 8) == 0)
496 printk("\n%04x: ", i);
497 printk("%04x ", s->VUtable[i]);
498 }
499
500 printk("\n-------------------------------------------"
501 "----------------------------------\n");
502
503 printk("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks);
504 for (i = 0; i <= s->lastEUN; i++) {
505 if ((i % 8) == 0)
506 printk("\n%04x: ", i);
507 printk("%04x ", s->PUtable[i]);
508 }
509
510 printk("\n-------------------------------------------"
511 "----------------------------------\n");
512
513 printk("INFTL ->\n"
514 " EraseSize = %d\n"
515 " h/s/c = %d/%d/%d\n"
516 " numvunits = %d\n"
517 " firstEUN = %d\n"
518 " lastEUN = %d\n"
519 " numfreeEUNs = %d\n"
520 " LastFreeEUN = %d\n"
521 " nb_blocks = %d\n"
522 " nb_boot_blocks = %d",
523 s->EraseSize, s->heads, s->sectors, s->cylinders,
524 s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs,
525 s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks);
526
527 printk("\n-------------------------------------------"
528 "----------------------------------\n");
529 }
530
531 void INFTL_dumpVUchains(struct INFTLrecord *s)
532 {
533 int logical, block, i;
534
535 printk("-------------------------------------------"
536 "----------------------------------\n");
537
538 printk("INFTL Virtual Unit Chains:\n");
539 for (logical = 0; logical < s->nb_blocks; logical++) {
540 block = s->VUtable[logical];
541 if (block > s->nb_blocks)
542 continue;
543 printk(" LOGICAL %d --> %d ", logical, block);
544 for (i = 0; i < s->nb_blocks; i++) {
545 if (s->PUtable[block] == BLOCK_NIL)
546 break;
547 block = s->PUtable[block];
548 printk("%d ", block);
549 }
550 printk("\n");
551 }
552
553 printk("-------------------------------------------"
554 "----------------------------------\n");
555 }
556
557 int INFTL_mount(struct INFTLrecord *s)
558 {
559 struct mtd_info *mtd = s->mbd.mtd;
560 unsigned int block, first_block, prev_block, last_block;
561 unsigned int first_logical_block, logical_block, erase_mark;
562 int chain_length, do_format_chain;
563 struct inftl_unithead1 h0;
564 struct inftl_unittail h1;
565 size_t retlen;
566 int i;
567 u8 *ANACtable, ANAC;
568
569 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_mount(inftl=%p)\n", s);
570
571 /* Search for INFTL MediaHeader and Spare INFTL Media Header */
572 if (find_boot_record(s) < 0) {
573 printk(KERN_WARNING "INFTL: could not find valid boot record?\n");
574 return -ENXIO;
575 }
576
577 /* Init the logical to physical table */
578 for (i = 0; i < s->nb_blocks; i++)
579 s->VUtable[i] = BLOCK_NIL;
580
581 logical_block = block = BLOCK_NIL;
582
583 /* Temporary buffer to store ANAC numbers. */
584 ANACtable = kmalloc(s->nb_blocks * sizeof(u8), GFP_KERNEL);
585 if (!ANACtable) {
586 printk(KERN_WARNING "INFTL: allocation of ANACtable "
587 "failed (%zd bytes)\n",
588 s->nb_blocks * sizeof(u8));
589 return -ENOMEM;
590 }
591 memset(ANACtable, 0, s->nb_blocks);
592
593 /*
594 * First pass is to explore each physical unit, and construct the
595 * virtual chains that exist (newest physical unit goes into VUtable).
596 * Any block that is in any way invalid will be left in the
597 * NOTEXPLORED state. Then at the end we will try to format it and
598 * mark it as free.
599 */
600 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 1, explore each unit\n");
601 for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) {
602 if (s->PUtable[first_block] != BLOCK_NOTEXPLORED)
603 continue;
604
605 do_format_chain = 0;
606 first_logical_block = BLOCK_NIL;
607 last_block = BLOCK_NIL;
608 block = first_block;
609
610 for (chain_length = 0; ; chain_length++) {
611
612 if ((chain_length == 0) &&
613 (s->PUtable[block] != BLOCK_NOTEXPLORED)) {
614 /* Nothing to do here, onto next block */
615 break;
616 }
617
618 if (inftl_read_oob(mtd, block * s->EraseSize + 8,
619 8, &retlen, (char *)&h0) < 0 ||
620 inftl_read_oob(mtd, block * s->EraseSize +
621 2 * SECTORSIZE + 8, 8, &retlen,
622 (char *)&h1) < 0) {
623 /* Should never happen? */
624 do_format_chain++;
625 break;
626 }
627
628 logical_block = le16_to_cpu(h0.virtualUnitNo);
629 prev_block = le16_to_cpu(h0.prevUnitNo);
630 erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1));
631 ANACtable[block] = h0.ANAC;
632
633 /* Previous block is relative to start of Partition */
634 if (prev_block < s->nb_blocks)
635 prev_block += s->firstEUN;
636
637 /* Already explored partial chain? */
638 if (s->PUtable[block] != BLOCK_NOTEXPLORED) {
639 /* Check if chain for this logical */
640 if (logical_block == first_logical_block) {
641 if (last_block != BLOCK_NIL)
642 s->PUtable[last_block] = block;
643 }
644 break;
645 }
646
647 /* Check for invalid block */
648 if (erase_mark != ERASE_MARK) {
649 printk(KERN_WARNING "INFTL: corrupt block %d "
650 "in chain %d, chain length %d, erase "
651 "mark 0x%x?\n", block, first_block,
652 chain_length, erase_mark);
653 /*
654 * Assume end of chain, probably incomplete
655 * fold/erase...
656 */
657 if (chain_length == 0)
658 do_format_chain++;
659 break;
660 }
661
662 /* Check for it being free already then... */
663 if ((logical_block == BLOCK_FREE) ||
664 (logical_block == BLOCK_NIL)) {
665 s->PUtable[block] = BLOCK_FREE;
666 break;
667 }
668
669 /* Sanity checks on block numbers */
670 if ((logical_block >= s->nb_blocks) ||
671 ((prev_block >= s->nb_blocks) &&
672 (prev_block != BLOCK_NIL))) {
673 if (chain_length > 0) {
674 printk(KERN_WARNING "INFTL: corrupt "
675 "block %d in chain %d?\n",
676 block, first_block);
677 do_format_chain++;
678 }
679 break;
680 }
681
682 if (first_logical_block == BLOCK_NIL) {
683 first_logical_block = logical_block;
684 } else {
685 if (first_logical_block != logical_block) {
686 /* Normal for folded chain... */
687 break;
688 }
689 }
690
691 /*
692 * Current block is valid, so if we followed a virtual
693 * chain to get here then we can set the previous
694 * block pointer in our PUtable now. Then move onto
695 * the previous block in the chain.
696 */
697 s->PUtable[block] = BLOCK_NIL;
698 if (last_block != BLOCK_NIL)
699 s->PUtable[last_block] = block;
700 last_block = block;
701 block = prev_block;
702
703 /* Check for end of chain */
704 if (block == BLOCK_NIL)
705 break;
706
707 /* Validate next block before following it... */
708 if (block > s->lastEUN) {
709 printk(KERN_WARNING "INFTL: invalid previous "
710 "block %d in chain %d?\n", block,
711 first_block);
712 do_format_chain++;
713 break;
714 }
715 }
716
717 if (do_format_chain) {
718 format_chain(s, first_block);
719 continue;
720 }
721
722 /*
723 * Looks like a valid chain then. It may not really be the
724 * newest block in the chain, but it is the newest we have
725 * found so far. We might update it in later iterations of
726 * this loop if we find something newer.
727 */
728 s->VUtable[first_logical_block] = first_block;
729 logical_block = BLOCK_NIL;
730 }
731
732 #ifdef CONFIG_MTD_DEBUG_VERBOSE
733 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
734 INFTL_dumptables(s);
735 #endif
736
737 /*
738 * Second pass, check for infinite loops in chains. These are
739 * possible because we don't update the previous pointers when
740 * we fold chains. No big deal, just fix them up in PUtable.
741 */
742 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 2, validate virtual chains\n");
743 for (logical_block = 0; logical_block < s->numvunits; logical_block++) {
744 block = s->VUtable[logical_block];
745 last_block = BLOCK_NIL;
746
747 /* Check for free/reserved/nil */
748 if (block >= BLOCK_RESERVED)
749 continue;
750
751 ANAC = ANACtable[block];
752 for (i = 0; i < s->numvunits; i++) {
753 if (s->PUtable[block] == BLOCK_NIL)
754 break;
755 if (s->PUtable[block] > s->lastEUN) {
756 printk(KERN_WARNING "INFTL: invalid prev %d, "
757 "in virtual chain %d\n",
758 s->PUtable[block], logical_block);
759 s->PUtable[block] = BLOCK_NIL;
760
761 }
762 if (ANACtable[block] != ANAC) {
763 /*
764 * Chain must point back to itself. This is ok,
765 * but we will need adjust the tables with this
766 * newest block and oldest block.
767 */
768 s->VUtable[logical_block] = block;
769 s->PUtable[last_block] = BLOCK_NIL;
770 break;
771 }
772
773 ANAC--;
774 last_block = block;
775 block = s->PUtable[block];
776 }
777
778 if (i >= s->nb_blocks) {
779 /*
780 * Uhoo, infinite chain with valid ANACS!
781 * Format whole chain...
782 */
783 format_chain(s, first_block);
784 }
785 }
786
787 #ifdef CONFIG_MTD_DEBUG_VERBOSE
788 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
789 INFTL_dumptables(s);
790 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
791 INFTL_dumpVUchains(s);
792 #endif
793
794 /*
795 * Third pass, format unreferenced blocks and init free block count.
796 */
797 s->numfreeEUNs = 0;
798 s->LastFreeEUN = BLOCK_NIL;
799
800 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 3, format unused blocks\n");
801 for (block = s->firstEUN; block <= s->lastEUN; block++) {
802 if (s->PUtable[block] == BLOCK_NOTEXPLORED) {
803 printk("INFTL: unreferenced block %d, formatting it\n",
804 block);
805 if (INFTL_formatblock(s, block) < 0)
806 s->PUtable[block] = BLOCK_RESERVED;
807 else
808 s->PUtable[block] = BLOCK_FREE;
809 }
810 if (s->PUtable[block] == BLOCK_FREE) {
811 s->numfreeEUNs++;
812 if (s->LastFreeEUN == BLOCK_NIL)
813 s->LastFreeEUN = block;
814 }
815 }
816
817 kfree(ANACtable);
818 return 0;
819 }
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