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proc: fix NULL ->i_fop oops
[wrt350n-kernel.git] / drivers / mtd / inftlmount.c
blobb8917beeb65099262da1e316282d663e43933e39
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/delay.h>
35 #include <linux/slab.h>
36 #include <linux/init.h>
37 #include <linux/mtd/mtd.h>
38 #include <linux/mtd/nftl.h>
39 #include <linux/mtd/inftl.h>
40 #include <linux/mtd/compatmac.h>
41
42 char inftlmountrev[]="$Revision: 1.18 $";
43
44 extern int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len,
45 size_t *retlen, uint8_t *buf);
46 extern int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len,
47 size_t *retlen, uint8_t *buf);
48
49 /*
50 * find_boot_record: Find the INFTL Media Header and its Spare copy which
51 * contains the various device information of the INFTL partition and
52 * Bad Unit Table. Update the PUtable[] table according to the Bad
53 * Unit Table. PUtable[] is used for management of Erase Unit in
54 * other routines in inftlcore.c and inftlmount.c.
55 */
56 static int find_boot_record(struct INFTLrecord *inftl)
57 {
58 struct inftl_unittail h1;
59 //struct inftl_oob oob;
60 unsigned int i, block;
61 u8 buf[SECTORSIZE];
62 struct INFTLMediaHeader *mh = &inftl->MediaHdr;
63 struct mtd_info *mtd = inftl->mbd.mtd;
64 struct INFTLPartition *ip;
65 size_t retlen;
66
67 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: find_boot_record(inftl=%p)\n", inftl);
68
69 /*
70 * Assume logical EraseSize == physical erasesize for starting the
71 * scan. We'll sort it out later if we find a MediaHeader which says
72 * otherwise.
73 */
74 inftl->EraseSize = inftl->mbd.mtd->erasesize;
75 inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
76
77 inftl->MediaUnit = BLOCK_NIL;
78
79 /* Search for a valid boot record */
80 for (block = 0; block < inftl->nb_blocks; block++) {
81 int ret;
82
83 /*
84 * Check for BNAND header first. Then whinge if it's found
85 * but later checks fail.
86 */
87 ret = mtd->read(mtd, block * inftl->EraseSize,
88 SECTORSIZE, &retlen, buf);
89 /* We ignore ret in case the ECC of the MediaHeader is invalid
90 (which is apparently acceptable) */
91 if (retlen != SECTORSIZE) {
92 static int warncount = 5;
93
94 if (warncount) {
95 printk(KERN_WARNING "INFTL: block read at 0x%x "
96 "of mtd%d failed: %d\n",
97 block * inftl->EraseSize,
98 inftl->mbd.mtd->index, ret);
99 if (!--warncount)
100 printk(KERN_WARNING "INFTL: further "
101 "failures for this block will "
102 "not be printed\n");
103 }
104 continue;
105 }
106
107 if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
108 /* BNAND\0 not found. Continue */
109 continue;
110 }
111
112 /* To be safer with BIOS, also use erase mark as discriminant */
113 if ((ret = inftl_read_oob(mtd, block * inftl->EraseSize +
114 SECTORSIZE + 8, 8, &retlen,
115 (char *)&h1) < 0)) {
116 printk(KERN_WARNING "INFTL: ANAND header found at "
117 "0x%x in mtd%d, but OOB data read failed "
118 "(err %d)\n", block * inftl->EraseSize,
119 inftl->mbd.mtd->index, ret);
120 continue;
121 }
122
123
124 /*
125 * This is the first we've seen.
126 * Copy the media header structure into place.
127 */
128 memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
129
130 /* Read the spare media header at offset 4096 */
131 mtd->read(mtd, block * inftl->EraseSize + 4096,
132 SECTORSIZE, &retlen, buf);
133 if (retlen != SECTORSIZE) {
134 printk(KERN_WARNING "INFTL: Unable to read spare "
135 "Media Header\n");
136 return -1;
137 }
138 /* Check if this one is the same as the first one we found. */
139 if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
140 printk(KERN_WARNING "INFTL: Primary and spare Media "
141 "Headers disagree.\n");
142 return -1;
143 }
144
145 mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
146 mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
147 mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
148 mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
149 mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
150 mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
151
152 #ifdef CONFIG_MTD_DEBUG_VERBOSE
153 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
154 printk("INFTL: Media Header ->\n"
155 " bootRecordID = %s\n"
156 " NoOfBootImageBlocks = %d\n"
157 " NoOfBinaryPartitions = %d\n"
158 " NoOfBDTLPartitions = %d\n"
159 " BlockMultiplerBits = %d\n"
160 " FormatFlgs = %d\n"
161 " OsakVersion = 0x%x\n"
162 " PercentUsed = %d\n",
163 mh->bootRecordID, mh->NoOfBootImageBlocks,
164 mh->NoOfBinaryPartitions,
165 mh->NoOfBDTLPartitions,
166 mh->BlockMultiplierBits, mh->FormatFlags,
167 mh->OsakVersion, mh->PercentUsed);
168 }
169 #endif
170
171 if (mh->NoOfBDTLPartitions == 0) {
172 printk(KERN_WARNING "INFTL: Media Header sanity check "
173 "failed: NoOfBDTLPartitions (%d) == 0, "
174 "must be at least 1\n", mh->NoOfBDTLPartitions);
175 return -1;
176 }
177
178 if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
179 printk(KERN_WARNING "INFTL: Media Header sanity check "
180 "failed: Total Partitions (%d) > 4, "
181 "BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
182 mh->NoOfBinaryPartitions,
183 mh->NoOfBDTLPartitions,
184 mh->NoOfBinaryPartitions);
185 return -1;
186 }
187
188 if (mh->BlockMultiplierBits > 1) {
189 printk(KERN_WARNING "INFTL: sorry, we don't support "
190 "UnitSizeFactor 0x%02x\n",
191 mh->BlockMultiplierBits);
192 return -1;
193 } else if (mh->BlockMultiplierBits == 1) {
194 printk(KERN_WARNING "INFTL: support for INFTL with "
195 "UnitSizeFactor 0x%02x is experimental\n",
196 mh->BlockMultiplierBits);
197 inftl->EraseSize = inftl->mbd.mtd->erasesize <<
198 mh->BlockMultiplierBits;
199 inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
200 block >>= mh->BlockMultiplierBits;
201 }
202
203 /* Scan the partitions */
204 for (i = 0; (i < 4); i++) {
205 ip = &mh->Partitions[i];
206 ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
207 ip->firstUnit = le32_to_cpu(ip->firstUnit);
208 ip->lastUnit = le32_to_cpu(ip->lastUnit);
209 ip->flags = le32_to_cpu(ip->flags);
210 ip->spareUnits = le32_to_cpu(ip->spareUnits);
211 ip->Reserved0 = le32_to_cpu(ip->Reserved0);
212
213 #ifdef CONFIG_MTD_DEBUG_VERBOSE
214 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
215 printk(" PARTITION[%d] ->\n"
216 " virtualUnits = %d\n"
217 " firstUnit = %d\n"
218 " lastUnit = %d\n"
219 " flags = 0x%x\n"
220 " spareUnits = %d\n",
221 i, ip->virtualUnits, ip->firstUnit,
222 ip->lastUnit, ip->flags,
223 ip->spareUnits);
224 }
225 #endif
226
227 if (ip->Reserved0 != ip->firstUnit) {
228 struct erase_info *instr = &inftl->instr;
229
230 instr->mtd = inftl->mbd.mtd;
231
232 /*
233 * Most likely this is using the
234 * undocumented qiuck mount feature.
235 * We don't support that, we will need
236 * to erase the hidden block for full
237 * compatibility.
238 */
239 instr->addr = ip->Reserved0 * inftl->EraseSize;
240 instr->len = inftl->EraseSize;
241 mtd->erase(mtd, instr);
242 }
243 if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
244 printk(KERN_WARNING "INFTL: Media Header "
245 "Partition %d sanity check failed\n"
246 " firstUnit %d : lastUnit %d > "
247 "virtualUnits %d\n", i, ip->lastUnit,
248 ip->firstUnit, ip->Reserved0);
249 return -1;
250 }
251 if (ip->Reserved1 != 0) {
252 printk(KERN_WARNING "INFTL: Media Header "
253 "Partition %d sanity check failed: "
254 "Reserved1 %d != 0\n",
255 i, ip->Reserved1);
256 return -1;
257 }
258
259 if (ip->flags & INFTL_BDTL)
260 break;
261 }
262
263 if (i >= 4) {
264 printk(KERN_WARNING "INFTL: Media Header Partition "
265 "sanity check failed:\n No partition "
266 "marked as Disk Partition\n");
267 return -1;
268 }
269
270 inftl->nb_boot_blocks = ip->firstUnit;
271 inftl->numvunits = ip->virtualUnits;
272 if (inftl->numvunits > (inftl->nb_blocks -
273 inftl->nb_boot_blocks - 2)) {
274 printk(KERN_WARNING "INFTL: Media Header sanity check "
275 "failed:\n numvunits (%d) > nb_blocks "
276 "(%d) - nb_boot_blocks(%d) - 2\n",
277 inftl->numvunits, inftl->nb_blocks,
278 inftl->nb_boot_blocks);
279 return -1;
280 }
281
282 inftl->mbd.size = inftl->numvunits *
283 (inftl->EraseSize / SECTORSIZE);
284
285 /*
286 * Block count is set to last used EUN (we won't need to keep
287 * any meta-data past that point).
288 */
289 inftl->firstEUN = ip->firstUnit;
290 inftl->lastEUN = ip->lastUnit;
291 inftl->nb_blocks = ip->lastUnit + 1;
292
293 /* Memory alloc */
294 inftl->PUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
295 if (!inftl->PUtable) {
296 printk(KERN_WARNING "INFTL: allocation of PUtable "
297 "failed (%zd bytes)\n",
298 inftl->nb_blocks * sizeof(u16));
299 return -ENOMEM;
300 }
301
302 inftl->VUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
303 if (!inftl->VUtable) {
304 kfree(inftl->PUtable);
305 printk(KERN_WARNING "INFTL: allocation of VUtable "
306 "failed (%zd bytes)\n",
307 inftl->nb_blocks * sizeof(u16));
308 return -ENOMEM;
309 }
310
311 /* Mark the blocks before INFTL MediaHeader as reserved */
312 for (i = 0; i < inftl->nb_boot_blocks; i++)
313 inftl->PUtable[i] = BLOCK_RESERVED;
314 /* Mark all remaining blocks as potentially containing data */
315 for (; i < inftl->nb_blocks; i++)
316 inftl->PUtable[i] = BLOCK_NOTEXPLORED;
317
318 /* Mark this boot record (NFTL MediaHeader) block as reserved */
319 inftl->PUtable[block] = BLOCK_RESERVED;
320
321 /* Read Bad Erase Unit Table and modify PUtable[] accordingly */
322 for (i = 0; i < inftl->nb_blocks; i++) {
323 int physblock;
324 /* If any of the physical eraseblocks are bad, don't
325 use the unit. */
326 for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
327 if (inftl->mbd.mtd->block_isbad(inftl->mbd.mtd, i * inftl->EraseSize + physblock))
328 inftl->PUtable[i] = BLOCK_RESERVED;
329 }
330 }
331
332 inftl->MediaUnit = block;
333 return 0;
334 }
335
336 /* Not found. */
337 return -1;
338 }
339
340 static int memcmpb(void *a, int c, int n)
341 {
342 int i;
343 for (i = 0; i < n; i++) {
344 if (c != ((unsigned char *)a)[i])
345 return 1;
346 }
347 return 0;
348 }
349
350 /*
351 * check_free_sector: check if a free sector is actually FREE,
352 * i.e. All 0xff in data and oob area.
353 */
354 static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
355 int len, int check_oob)
356 {
357 u8 buf[SECTORSIZE + inftl->mbd.mtd->oobsize];
358 struct mtd_info *mtd = inftl->mbd.mtd;
359 size_t retlen;
360 int i;
361
362 for (i = 0; i < len; i += SECTORSIZE) {
363 if (mtd->read(mtd, address, SECTORSIZE, &retlen, buf))
364 return -1;
365 if (memcmpb(buf, 0xff, SECTORSIZE) != 0)
366 return -1;
367
368 if (check_oob) {
369 if(inftl_read_oob(mtd, address, mtd->oobsize,
370 &retlen, &buf[SECTORSIZE]) < 0)
371 return -1;
372 if (memcmpb(buf + SECTORSIZE, 0xff, mtd->oobsize) != 0)
373 return -1;
374 }
375 address += SECTORSIZE;
376 }
377
378 return 0;
379 }
380
381 /*
382 * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
383 * Unit and Update INFTL metadata. Each erase operation is
384 * checked with check_free_sectors.
385 *
386 * Return: 0 when succeed, -1 on error.
387 *
388 * ToDo: 1. Is it neceressary to check_free_sector after erasing ??
389 */
390 int INFTL_formatblock(struct INFTLrecord *inftl, int block)
391 {
392 size_t retlen;
393 struct inftl_unittail uci;
394 struct erase_info *instr = &inftl->instr;
395 struct mtd_info *mtd = inftl->mbd.mtd;
396 int physblock;
397
398 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_formatblock(inftl=%p,"
399 "block=%d)\n", inftl, block);
400
401 memset(instr, 0, sizeof(struct erase_info));
402
403 /* FIXME: Shouldn't we be setting the 'discarded' flag to zero
404 _first_? */
405
406 /* Use async erase interface, test return code */
407 instr->mtd = inftl->mbd.mtd;
408 instr->addr = block * inftl->EraseSize;
409 instr->len = inftl->mbd.mtd->erasesize;
410 /* Erase one physical eraseblock at a time, even though the NAND api
411 allows us to group them. This way we if we have a failure, we can
412 mark only the failed block in the bbt. */
413 for (physblock = 0; physblock < inftl->EraseSize;
414 physblock += instr->len, instr->addr += instr->len) {
415 mtd->erase(inftl->mbd.mtd, instr);
416
417 if (instr->state == MTD_ERASE_FAILED) {
418 printk(KERN_WARNING "INFTL: error while formatting block %d\n",
419 block);
420 goto fail;
421 }
422
423 /*
424 * Check the "freeness" of Erase Unit before updating metadata.
425 * FixMe: is this check really necessary? Since we have check
426 * the return code after the erase operation.
427 */
428 if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0)
429 goto fail;
430 }
431
432 uci.EraseMark = cpu_to_le16(ERASE_MARK);
433 uci.EraseMark1 = cpu_to_le16(ERASE_MARK);
434 uci.Reserved[0] = 0;
435 uci.Reserved[1] = 0;
436 uci.Reserved[2] = 0;
437 uci.Reserved[3] = 0;
438 instr->addr = block * inftl->EraseSize + SECTORSIZE * 2;
439 if (inftl_write_oob(mtd, instr->addr + 8, 8, &retlen, (char *)&uci) < 0)
440 goto fail;
441 return 0;
442 fail:
443 /* could not format, update the bad block table (caller is responsible
444 for setting the PUtable to BLOCK_RESERVED on failure) */
445 inftl->mbd.mtd->block_markbad(inftl->mbd.mtd, instr->addr);
446 return -1;
447 }
448
449 /*
450 * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
451 * Units in a Virtual Unit Chain, i.e. all the units are disconnected.
452 *
453 * Since the chain is invalid then we will have to erase it from its
454 * head (normally for INFTL we go from the oldest). But if it has a
455 * loop then there is no oldest...
456 */
457 static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
458 {
459 unsigned int block = first_block, block1;
460
461 printk(KERN_WARNING "INFTL: formatting chain at block %d\n",
462 first_block);
463
464 for (;;) {
465 block1 = inftl->PUtable[block];
466
467 printk(KERN_WARNING "INFTL: formatting block %d\n", block);
468 if (INFTL_formatblock(inftl, block) < 0) {
469 /*
470 * Cannot format !!!! Mark it as Bad Unit,
471 */
472 inftl->PUtable[block] = BLOCK_RESERVED;
473 } else {
474 inftl->PUtable[block] = BLOCK_FREE;
475 }
476
477 /* Goto next block on the chain */
478 block = block1;
479
480 if (block == BLOCK_NIL || block >= inftl->lastEUN)
481 break;
482 }
483 }
484
485 void INFTL_dumptables(struct INFTLrecord *s)
486 {
487 int i;
488
489 printk("-------------------------------------------"
490 "----------------------------------\n");
491
492 printk("VUtable[%d] ->", s->nb_blocks);
493 for (i = 0; i < s->nb_blocks; i++) {
494 if ((i % 8) == 0)
495 printk("\n%04x: ", i);
496 printk("%04x ", s->VUtable[i]);
497 }
498
499 printk("\n-------------------------------------------"
500 "----------------------------------\n");
501
502 printk("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks);
503 for (i = 0; i <= s->lastEUN; i++) {
504 if ((i % 8) == 0)
505 printk("\n%04x: ", i);
506 printk("%04x ", s->PUtable[i]);
507 }
508
509 printk("\n-------------------------------------------"
510 "----------------------------------\n");
511
512 printk("INFTL ->\n"
513 " EraseSize = %d\n"
514 " h/s/c = %d/%d/%d\n"
515 " numvunits = %d\n"
516 " firstEUN = %d\n"
517 " lastEUN = %d\n"
518 " numfreeEUNs = %d\n"
519 " LastFreeEUN = %d\n"
520 " nb_blocks = %d\n"
521 " nb_boot_blocks = %d",
522 s->EraseSize, s->heads, s->sectors, s->cylinders,
523 s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs,
524 s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks);
525
526 printk("\n-------------------------------------------"
527 "----------------------------------\n");
528 }
529
530 void INFTL_dumpVUchains(struct INFTLrecord *s)
531 {
532 int logical, block, i;
533
534 printk("-------------------------------------------"
535 "----------------------------------\n");
536
537 printk("INFTL Virtual Unit Chains:\n");
538 for (logical = 0; logical < s->nb_blocks; logical++) {
539 block = s->VUtable[logical];
540 if (block > s->nb_blocks)
541 continue;
542 printk(" LOGICAL %d --> %d ", logical, block);
543 for (i = 0; i < s->nb_blocks; i++) {
544 if (s->PUtable[block] == BLOCK_NIL)
545 break;
546 block = s->PUtable[block];
547 printk("%d ", block);
548 }
549 printk("\n");
550 }
551
552 printk("-------------------------------------------"
553 "----------------------------------\n");
554 }
555
556 int INFTL_mount(struct INFTLrecord *s)
557 {
558 struct mtd_info *mtd = s->mbd.mtd;
559 unsigned int block, first_block, prev_block, last_block;
560 unsigned int first_logical_block, logical_block, erase_mark;
561 int chain_length, do_format_chain;
562 struct inftl_unithead1 h0;
563 struct inftl_unittail h1;
564 size_t retlen;
565 int i;
566 u8 *ANACtable, ANAC;
567
568 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_mount(inftl=%p)\n", s);
569
570 /* Search for INFTL MediaHeader and Spare INFTL Media Header */
571 if (find_boot_record(s) < 0) {
572 printk(KERN_WARNING "INFTL: could not find valid boot record?\n");
573 return -ENXIO;
574 }
575
576 /* Init the logical to physical table */
577 for (i = 0; i < s->nb_blocks; i++)
578 s->VUtable[i] = BLOCK_NIL;
579
580 logical_block = block = BLOCK_NIL;
581
582 /* Temporary buffer to store ANAC numbers. */
583 ANACtable = kcalloc(s->nb_blocks, sizeof(u8), GFP_KERNEL);
584 if (!ANACtable) {
585 printk(KERN_WARNING "INFTL: allocation of ANACtable "
586 "failed (%zd bytes)\n",
587 s->nb_blocks * sizeof(u8));
588 return -ENOMEM;
589 }
590
591 /*
592 * First pass is to explore each physical unit, and construct the
593 * virtual chains that exist (newest physical unit goes into VUtable).
594 * Any block that is in any way invalid will be left in the
595 * NOTEXPLORED state. Then at the end we will try to format it and
596 * mark it as free.
597 */
598 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 1, explore each unit\n");
599 for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) {
600 if (s->PUtable[first_block] != BLOCK_NOTEXPLORED)
601 continue;
602
603 do_format_chain = 0;
604 first_logical_block = BLOCK_NIL;
605 last_block = BLOCK_NIL;
606 block = first_block;
607
608 for (chain_length = 0; ; chain_length++) {
609
610 if ((chain_length == 0) &&
611 (s->PUtable[block] != BLOCK_NOTEXPLORED)) {
612 /* Nothing to do here, onto next block */
613 break;
614 }
615
616 if (inftl_read_oob(mtd, block * s->EraseSize + 8,
617 8, &retlen, (char *)&h0) < 0 ||
618 inftl_read_oob(mtd, block * s->EraseSize +
619 2 * SECTORSIZE + 8, 8, &retlen,
620 (char *)&h1) < 0) {
621 /* Should never happen? */
622 do_format_chain++;
623 break;
624 }
625
626 logical_block = le16_to_cpu(h0.virtualUnitNo);
627 prev_block = le16_to_cpu(h0.prevUnitNo);
628 erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1));
629 ANACtable[block] = h0.ANAC;
630
631 /* Previous block is relative to start of Partition */
632 if (prev_block < s->nb_blocks)
633 prev_block += s->firstEUN;
634
635 /* Already explored partial chain? */
636 if (s->PUtable[block] != BLOCK_NOTEXPLORED) {
637 /* Check if chain for this logical */
638 if (logical_block == first_logical_block) {
639 if (last_block != BLOCK_NIL)
640 s->PUtable[last_block] = block;
641 }
642 break;
643 }
644
645 /* Check for invalid block */
646 if (erase_mark != ERASE_MARK) {
647 printk(KERN_WARNING "INFTL: corrupt block %d "
648 "in chain %d, chain length %d, erase "
649 "mark 0x%x?\n", block, first_block,
650 chain_length, erase_mark);
651 /*
652 * Assume end of chain, probably incomplete
653 * fold/erase...
654 */
655 if (chain_length == 0)
656 do_format_chain++;
657 break;
658 }
659
660 /* Check for it being free already then... */
661 if ((logical_block == BLOCK_FREE) ||
662 (logical_block == BLOCK_NIL)) {
663 s->PUtable[block] = BLOCK_FREE;
664 break;
665 }
666
667 /* Sanity checks on block numbers */
668 if ((logical_block >= s->nb_blocks) ||
669 ((prev_block >= s->nb_blocks) &&
670 (prev_block != BLOCK_NIL))) {
671 if (chain_length > 0) {
672 printk(KERN_WARNING "INFTL: corrupt "
673 "block %d in chain %d?\n",
674 block, first_block);
675 do_format_chain++;
676 }
677 break;
678 }
679
680 if (first_logical_block == BLOCK_NIL) {
681 first_logical_block = logical_block;
682 } else {
683 if (first_logical_block != logical_block) {
684 /* Normal for folded chain... */
685 break;
686 }
687 }
688
689 /*
690 * Current block is valid, so if we followed a virtual
691 * chain to get here then we can set the previous
692 * block pointer in our PUtable now. Then move onto
693 * the previous block in the chain.
694 */
695 s->PUtable[block] = BLOCK_NIL;
696 if (last_block != BLOCK_NIL)
697 s->PUtable[last_block] = block;
698 last_block = block;
699 block = prev_block;
700
701 /* Check for end of chain */
702 if (block == BLOCK_NIL)
703 break;
704
705 /* Validate next block before following it... */
706 if (block > s->lastEUN) {
707 printk(KERN_WARNING "INFTL: invalid previous "
708 "block %d in chain %d?\n", block,
709 first_block);
710 do_format_chain++;
711 break;
712 }
713 }
714
715 if (do_format_chain) {
716 format_chain(s, first_block);
717 continue;
718 }
719
720 /*
721 * Looks like a valid chain then. It may not really be the
722 * newest block in the chain, but it is the newest we have
723 * found so far. We might update it in later iterations of
724 * this loop if we find something newer.
725 */
726 s->VUtable[first_logical_block] = first_block;
727 logical_block = BLOCK_NIL;
728 }
729
730 #ifdef CONFIG_MTD_DEBUG_VERBOSE
731 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
732 INFTL_dumptables(s);
733 #endif
734
735 /*
736 * Second pass, check for infinite loops in chains. These are
737 * possible because we don't update the previous pointers when
738 * we fold chains. No big deal, just fix them up in PUtable.
739 */
740 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 2, validate virtual chains\n");
741 for (logical_block = 0; logical_block < s->numvunits; logical_block++) {
742 block = s->VUtable[logical_block];
743 last_block = BLOCK_NIL;
744
745 /* Check for free/reserved/nil */
746 if (block >= BLOCK_RESERVED)
747 continue;
748
749 ANAC = ANACtable[block];
750 for (i = 0; i < s->numvunits; i++) {
751 if (s->PUtable[block] == BLOCK_NIL)
752 break;
753 if (s->PUtable[block] > s->lastEUN) {
754 printk(KERN_WARNING "INFTL: invalid prev %d, "
755 "in virtual chain %d\n",
756 s->PUtable[block], logical_block);
757 s->PUtable[block] = BLOCK_NIL;
758
759 }
760 if (ANACtable[block] != ANAC) {
761 /*
762 * Chain must point back to itself. This is ok,
763 * but we will need adjust the tables with this
764 * newest block and oldest block.
765 */
766 s->VUtable[logical_block] = block;
767 s->PUtable[last_block] = BLOCK_NIL;
768 break;
769 }
770
771 ANAC--;
772 last_block = block;
773 block = s->PUtable[block];
774 }
775
776 if (i >= s->nb_blocks) {
777 /*
778 * Uhoo, infinite chain with valid ANACS!
779 * Format whole chain...
780 */
781 format_chain(s, first_block);
782 }
783 }
784
785 #ifdef CONFIG_MTD_DEBUG_VERBOSE
786 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
787 INFTL_dumptables(s);
788 if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
789 INFTL_dumpVUchains(s);
790 #endif
791
792 /*
793 * Third pass, format unreferenced blocks and init free block count.
794 */
795 s->numfreeEUNs = 0;
796 s->LastFreeEUN = BLOCK_NIL;
797
798 DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 3, format unused blocks\n");
799 for (block = s->firstEUN; block <= s->lastEUN; block++) {
800 if (s->PUtable[block] == BLOCK_NOTEXPLORED) {
801 printk("INFTL: unreferenced block %d, formatting it\n",
802 block);
803 if (INFTL_formatblock(s, block) < 0)
804 s->PUtable[block] = BLOCK_RESERVED;
805 else
806 s->PUtable[block] = BLOCK_FREE;
807 }
808 if (s->PUtable[block] == BLOCK_FREE) {
809 s->numfreeEUNs++;
810 if (s->LastFreeEUN == BLOCK_NIL)
811 s->LastFreeEUN = block;
812 }
813 }
814
815 kfree(ANACtable);
816 return 0;
817 }
WRT350N Kernel Patches