1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * inftlmount.c -- INFTL mount code with extensive checks.
4 *
5 * Author: Greg Ungerer (gerg@snapgear.com)
6 * Copyright © 2002-2003, Greg Ungerer (gerg@snapgear.com)
7 *
8 * Based heavily on the nftlmount.c code which is:
9 * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
10 * Copyright © 2000 Netgem S.A.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <asm/errno.h>
16 #include <asm/io.h>
17 #include <linux/uaccess.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
20 #include <linux/mtd/mtd.h>
21 #include <linux/mtd/nftl.h>
22 #include <linux/mtd/inftl.h>
23
24 /*
25 * find_boot_record: Find the INFTL Media Header and its Spare copy which
26 * contains the various device information of the INFTL partition and
27 * Bad Unit Table. Update the PUtable[] table according to the Bad
28 * Unit Table. PUtable[] is used for management of Erase Unit in
29 * other routines in inftlcore.c and inftlmount.c.
30 */
31 static int find_boot_record(struct INFTLrecord *inftl)
32 {
33 struct inftl_unittail h1;
34 //struct inftl_oob oob;
35 unsigned int i, block;
36 u8 buf[SECTORSIZE];
37 struct INFTLMediaHeader *mh = &inftl->MediaHdr;
38 struct mtd_info *mtd = inftl->mbd.mtd;
39 struct INFTLPartition *ip;
40 size_t retlen;
41
42 pr_debug("INFTL: find_boot_record(inftl=%p)\n", inftl);
43
44 /*
45 * Assume logical EraseSize == physical erasesize for starting the
46 * scan. We'll sort it out later if we find a MediaHeader which says
47 * otherwise.
48 */
49 inftl->EraseSize = inftl->mbd.mtd->erasesize;
50 inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
51
52 inftl->MediaUnit = BLOCK_NIL;
53
54 /* Search for a valid boot record */
55 for (block = 0; block < inftl->nb_blocks; block++) {
56 int ret;
57
58 /*
59 * Check for BNAND header first. Then whinge if it's found
60 * but later checks fail.
61 */
62 ret = mtd_read(mtd, block * inftl->EraseSize, SECTORSIZE,
63 &retlen, buf);
64 /* We ignore ret in case the ECC of the MediaHeader is invalid
65 (which is apparently acceptable) */
66 if (retlen != SECTORSIZE) {
67 static int warncount = 5;
68
69 if (warncount) {
70 printk(KERN_WARNING "INFTL: block read at 0x%x "
71 "of mtd%d failed: %d\n",
72 block * inftl->EraseSize,
73 inftl->mbd.mtd->index, ret);
74 if (!--warncount)
75 printk(KERN_WARNING "INFTL: further "
76 "failures for this block will "
77 "not be printed\n");
78 }
79 continue;
80 }
81
82 if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
83 /* BNAND\0 not found. Continue */
84 continue;
85 }
86
87 /* To be safer with BIOS, also use erase mark as discriminant */
88 ret = inftl_read_oob(mtd,
89 block * inftl->EraseSize + SECTORSIZE + 8,
90 8, &retlen,(char *)&h1);
91 if (ret < 0) {
92 printk(KERN_WARNING "INFTL: ANAND header found at "
93 "0x%x in mtd%d, but OOB data read failed "
94 "(err %d)\n", block * inftl->EraseSize,
95 inftl->mbd.mtd->index, ret);
96 continue;
97 }
98
99
100 /*
101 * This is the first we've seen.
102 * Copy the media header structure into place.
103 */
104 memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
105
106 /* Read the spare media header at offset 4096 */
107 mtd_read(mtd, block * inftl->EraseSize + 4096, SECTORSIZE,
108 &retlen, buf);
109 if (retlen != SECTORSIZE) {
110 printk(KERN_WARNING "INFTL: Unable to read spare "
111 "Media Header\n");
112 return -1;
113 }
114 /* Check if this one is the same as the first one we found. */
115 if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
116 printk(KERN_WARNING "INFTL: Primary and spare Media "
117 "Headers disagree.\n");
118 return -1;
119 }
120
121 mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
122 mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
123 mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
124 mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
125 mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
126 mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
127
128 pr_debug("INFTL: Media Header ->\n"
129 " bootRecordID = %s\n"
130 " NoOfBootImageBlocks = %d\n"
131 " NoOfBinaryPartitions = %d\n"
132 " NoOfBDTLPartitions = %d\n"
133 " BlockMultiplerBits = %d\n"
134 " FormatFlgs = %d\n"
135 " OsakVersion = 0x%x\n"
136 " PercentUsed = %d\n",
137 mh->bootRecordID, mh->NoOfBootImageBlocks,
138 mh->NoOfBinaryPartitions,
139 mh->NoOfBDTLPartitions,
140 mh->BlockMultiplierBits, mh->FormatFlags,
141 mh->OsakVersion, mh->PercentUsed);
142
143 if (mh->NoOfBDTLPartitions == 0) {
144 printk(KERN_WARNING "INFTL: Media Header sanity check "
145 "failed: NoOfBDTLPartitions (%d) == 0, "
146 "must be at least 1\n", mh->NoOfBDTLPartitions);
147 return -1;
148 }
149
150 if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
151 printk(KERN_WARNING "INFTL: Media Header sanity check "
152 "failed: Total Partitions (%d) > 4, "
153 "BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
154 mh->NoOfBinaryPartitions,
155 mh->NoOfBDTLPartitions,
156 mh->NoOfBinaryPartitions);
157 return -1;
158 }
159
160 if (mh->BlockMultiplierBits > 1) {
161 printk(KERN_WARNING "INFTL: sorry, we don't support "
162 "UnitSizeFactor 0x%02x\n",
163 mh->BlockMultiplierBits);
164 return -1;
165 } else if (mh->BlockMultiplierBits == 1) {
166 printk(KERN_WARNING "INFTL: support for INFTL with "
167 "UnitSizeFactor 0x%02x is experimental\n",
168 mh->BlockMultiplierBits);
169 inftl->EraseSize = inftl->mbd.mtd->erasesize <<
170 mh->BlockMultiplierBits;
171 inftl->nb_blocks = (u32)inftl->mbd.mtd->size / inftl->EraseSize;
172 block >>= mh->BlockMultiplierBits;
173 }
174
175 /* Scan the partitions */
176 for (i = 0; (i < 4); i++) {
177 ip = &mh->Partitions[i];
178 ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
179 ip->firstUnit = le32_to_cpu(ip->firstUnit);
180 ip->lastUnit = le32_to_cpu(ip->lastUnit);
181 ip->flags = le32_to_cpu(ip->flags);
182 ip->spareUnits = le32_to_cpu(ip->spareUnits);
183 ip->Reserved0 = le32_to_cpu(ip->Reserved0);
184
185 pr_debug(" PARTITION[%d] ->\n"
186 " virtualUnits = %d\n"
187 " firstUnit = %d\n"
188 " lastUnit = %d\n"
189 " flags = 0x%x\n"
190 " spareUnits = %d\n",
191 i, ip->virtualUnits, ip->firstUnit,
192 ip->lastUnit, ip->flags,
193 ip->spareUnits);
194
195 if (ip->Reserved0 != ip->firstUnit) {
196 struct erase_info *instr = &inftl->instr;
197
198 /*
199 * Most likely this is using the
200 * undocumented qiuck mount feature.
201 * We don't support that, we will need
202 * to erase the hidden block for full
203 * compatibility.
204 */
205 instr->addr = ip->Reserved0 * inftl->EraseSize;
206 instr->len = inftl->EraseSize;
207 mtd_erase(mtd, instr);
208 }
209 if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
210 printk(KERN_WARNING "INFTL: Media Header "
211 "Partition %d sanity check failed\n"
212 " firstUnit %d : lastUnit %d > "
213 "virtualUnits %d\n", i, ip->lastUnit,
214 ip->firstUnit, ip->Reserved0);
215 return -1;
216 }
217 if (ip->Reserved1 != 0) {
218 printk(KERN_WARNING "INFTL: Media Header "
219 "Partition %d sanity check failed: "
220 "Reserved1 %d != 0\n",
221 i, ip->Reserved1);
222 return -1;
223 }
224
225 if (ip->flags & INFTL_BDTL)
226 break;
227 }
228
229 if (i >= 4) {
230 printk(KERN_WARNING "INFTL: Media Header Partition "
231 "sanity check failed:\n No partition "
232 "marked as Disk Partition\n");
233 return -1;
234 }
235
236 inftl->nb_boot_blocks = ip->firstUnit;
237 inftl->numvunits = ip->virtualUnits;
238 if (inftl->numvunits > (inftl->nb_blocks -
239 inftl->nb_boot_blocks - 2)) {
240 printk(KERN_WARNING "INFTL: Media Header sanity check "
241 "failed:\n numvunits (%d) > nb_blocks "
242 "(%d) - nb_boot_blocks(%d) - 2\n",
243 inftl->numvunits, inftl->nb_blocks,
244 inftl->nb_boot_blocks);
245 return -1;
246 }
247
248 inftl->mbd.size = inftl->numvunits *
249 (inftl->EraseSize / SECTORSIZE);
250
251 /*
252 * Block count is set to last used EUN (we won't need to keep
253 * any meta-data past that point).
254 */
255 inftl->firstEUN = ip->firstUnit;
256 inftl->lastEUN = ip->lastUnit;
257 inftl->nb_blocks = ip->lastUnit + 1;
258
259 /* Memory alloc */
260 inftl->PUtable = kmalloc_array(inftl->nb_blocks, sizeof(u16),
261 GFP_KERNEL);
262 if (!inftl->PUtable) {
263 printk(KERN_WARNING "INFTL: allocation of PUtable "
264 "failed (%zd bytes)\n",
265 inftl->nb_blocks * sizeof(u16));
266 return -ENOMEM;
267 }
268
269 inftl->VUtable = kmalloc_array(inftl->nb_blocks, sizeof(u16),
270 GFP_KERNEL);
271 if (!inftl->VUtable) {
272 kfree(inftl->PUtable);
273 printk(KERN_WARNING "INFTL: allocation of VUtable "
274 "failed (%zd bytes)\n",
275 inftl->nb_blocks * sizeof(u16));
276 return -ENOMEM;
277 }
278
279 /* Mark the blocks before INFTL MediaHeader as reserved */
280 for (i = 0; i < inftl->nb_boot_blocks; i++)
281 inftl->PUtable[i] = BLOCK_RESERVED;
282 /* Mark all remaining blocks as potentially containing data */
283 for (; i < inftl->nb_blocks; i++)
284 inftl->PUtable[i] = BLOCK_NOTEXPLORED;
285
286 /* Mark this boot record (NFTL MediaHeader) block as reserved */
287 inftl->PUtable[block] = BLOCK_RESERVED;
288
289 /* Read Bad Erase Unit Table and modify PUtable[] accordingly */
290 for (i = 0; i < inftl->nb_blocks; i++) {
291 int physblock;
292 /* If any of the physical eraseblocks are bad, don't
293 use the unit. */
294 for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
295 if (mtd_block_isbad(inftl->mbd.mtd,
296 i * inftl->EraseSize + physblock))
297 inftl->PUtable[i] = BLOCK_RESERVED;
298 }
299 }
300
301 inftl->MediaUnit = block;
302 return 0;
303 }
304
305 /* Not found. */
306 return -1;
307 }
308
309 static int memcmpb(void *a, int c, int n)
310 {
311 int i;
312 for (i = 0; i < n; i++) {
313 if (c != ((unsigned char *)a)[i])
314 return 1;
315 }
316 return 0;
317 }
318
319 /*
320 * check_free_sector: check if a free sector is actually FREE,
321 * i.e. All 0xff in data and oob area.
322 */
323 static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
324 int len, int check_oob)
325 {
326 struct mtd_info *mtd = inftl->mbd.mtd;
327 size_t retlen;
328 int i, ret;
329 u8 *buf;
330
331 buf = kmalloc(SECTORSIZE + mtd->oobsize, GFP_KERNEL);
332 if (!buf)
333 return -1;
334
335 ret = -1;
336 for (i = 0; i < len; i += SECTORSIZE) {
337 if (mtd_read(mtd, address, SECTORSIZE, &retlen, buf))
338 goto out;
339 if (memcmpb(buf, 0xff, SECTORSIZE) != 0)
340 goto out;
341
342 if (check_oob) {
343 if(inftl_read_oob(mtd, address, mtd->oobsize,
344 &retlen, &buf[SECTORSIZE]) < 0)
345 goto out;
346 if (memcmpb(buf + SECTORSIZE, 0xff, mtd->oobsize) != 0)
347 goto out;
348 }
349 address += SECTORSIZE;
350 }
351
352 ret = 0;
353
354 out:
355 kfree(buf);
356 return ret;
357 }
358
359 /*
360 * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
361 * Unit and Update INFTL metadata. Each erase operation is
362 * checked with check_free_sectors.
363 *
364 * Return: 0 when succeed, -1 on error.
365 *
366 * ToDo: 1. Is it necessary to check_free_sector after erasing ??
367 */
368 int INFTL_formatblock(struct INFTLrecord *inftl, int block)
369 {
370 size_t retlen;
371 struct inftl_unittail uci;
372 struct erase_info *instr = &inftl->instr;
373 struct mtd_info *mtd = inftl->mbd.mtd;
374 int physblock;
375
376 pr_debug("INFTL: INFTL_formatblock(inftl=%p,block=%d)\n", inftl, block);
377
378 memset(instr, 0, sizeof(struct erase_info));
379
380 /* FIXME: Shouldn't we be setting the 'discarded' flag to zero
381 _first_? */
382
383 /* Use async erase interface, test return code */
384 instr->addr = block * inftl->EraseSize;
385 instr->len = inftl->mbd.mtd->erasesize;
386 /* Erase one physical eraseblock at a time, even though the NAND api
387 allows us to group them. This way we if we have a failure, we can
388 mark only the failed block in the bbt. */
389 for (physblock = 0; physblock < inftl->EraseSize;
390 physblock += instr->len, instr->addr += instr->len) {
391 int ret;
392
393 ret = mtd_erase(inftl->mbd.mtd, instr);
394 if (ret) {
395 printk(KERN_WARNING "INFTL: error while formatting block %d\n",
396 block);
397 goto fail;
398 }
399
400 /*
401 * Check the "freeness" of Erase Unit before updating metadata.
402 * FixMe: is this check really necessary? Since we have check
403 * the return code after the erase operation.
404 */
405 if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0)
406 goto fail;
407 }
408
409 uci.EraseMark = cpu_to_le16(ERASE_MARK);
410 uci.EraseMark1 = cpu_to_le16(ERASE_MARK);
411 uci.Reserved[0] = 0;
412 uci.Reserved[1] = 0;
413 uci.Reserved[2] = 0;
414 uci.Reserved[3] = 0;
415 instr->addr = block * inftl->EraseSize + SECTORSIZE * 2;
416 if (inftl_write_oob(mtd, instr->addr + 8, 8, &retlen, (char *)&uci) < 0)
417 goto fail;
418 return 0;
419 fail:
420 /* could not format, update the bad block table (caller is responsible
421 for setting the PUtable to BLOCK_RESERVED on failure) */
422 mtd_block_markbad(inftl->mbd.mtd, instr->addr);
423 return -1;
424 }
425
426 /*
427 * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
428 * Units in a Virtual Unit Chain, i.e. all the units are disconnected.
429 *
430 * Since the chain is invalid then we will have to erase it from its
431 * head (normally for INFTL we go from the oldest). But if it has a
432 * loop then there is no oldest...
433 */
434 static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
435 {
436 unsigned int block = first_block, block1;
437
438 printk(KERN_WARNING "INFTL: formatting chain at block %d\n",
439 first_block);
440
441 for (;;) {
442 block1 = inftl->PUtable[block];
443
444 printk(KERN_WARNING "INFTL: formatting block %d\n", block);
445 if (INFTL_formatblock(inftl, block) < 0) {
446 /*
447 * Cannot format !!!! Mark it as Bad Unit,
448 */
449 inftl->PUtable[block] = BLOCK_RESERVED;
450 } else {
451 inftl->PUtable[block] = BLOCK_FREE;
452 }
453
454 /* Goto next block on the chain */
455 block = block1;
456
457 if (block == BLOCK_NIL || block >= inftl->lastEUN)
458 break;
459 }
460 }
461
462 void INFTL_dumptables(struct INFTLrecord *s)
463 {
464 int i;
465
466 pr_debug("-------------------------------------------"
467 "----------------------------------\n");
468
469 pr_debug("VUtable[%d] ->", s->nb_blocks);
470 for (i = 0; i < s->nb_blocks; i++) {
471 if ((i % 8) == 0)
472 pr_debug("\n%04x: ", i);
473 pr_debug("%04x ", s->VUtable[i]);
474 }
475
476 pr_debug("\n-------------------------------------------"
477 "----------------------------------\n");
478
479 pr_debug("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks);
480 for (i = 0; i <= s->lastEUN; i++) {
481 if ((i % 8) == 0)
482 pr_debug("\n%04x: ", i);
483 pr_debug("%04x ", s->PUtable[i]);
484 }
485
486 pr_debug("\n-------------------------------------------"
487 "----------------------------------\n");
488
489 pr_debug("INFTL ->\n"
490 " EraseSize = %d\n"
491 " h/s/c = %d/%d/%d\n"
492 " numvunits = %d\n"
493 " firstEUN = %d\n"
494 " lastEUN = %d\n"
495 " numfreeEUNs = %d\n"
496 " LastFreeEUN = %d\n"
497 " nb_blocks = %d\n"
498 " nb_boot_blocks = %d",
499 s->EraseSize, s->heads, s->sectors, s->cylinders,
500 s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs,
501 s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks);
502
503 pr_debug("\n-------------------------------------------"
504 "----------------------------------\n");
505 }
506
507 void INFTL_dumpVUchains(struct INFTLrecord *s)
508 {
509 int logical, block, i;
510
511 pr_debug("-------------------------------------------"
512 "----------------------------------\n");
513
514 pr_debug("INFTL Virtual Unit Chains:\n");
515 for (logical = 0; logical < s->nb_blocks; logical++) {
516 block = s->VUtable[logical];
517 if (block >= s->nb_blocks)
518 continue;
519 pr_debug(" LOGICAL %d --> %d ", logical, block);
520 for (i = 0; i < s->nb_blocks; i++) {
521 if (s->PUtable[block] == BLOCK_NIL)
522 break;
523 block = s->PUtable[block];
524 pr_debug("%d ", block);
525 }
526 pr_debug("\n");
527 }
528
529 pr_debug("-------------------------------------------"
530 "----------------------------------\n");
531 }
532
533 int INFTL_mount(struct INFTLrecord *s)
534 {
535 struct mtd_info *mtd = s->mbd.mtd;
536 unsigned int block, first_block, prev_block, last_block;
537 unsigned int first_logical_block, logical_block, erase_mark;
538 int chain_length, do_format_chain;
539 struct inftl_unithead1 h0;
540 struct inftl_unittail h1;
541 size_t retlen;
542 int i;
543 u8 *ANACtable, ANAC;
544
545 pr_debug("INFTL: INFTL_mount(inftl=%p)\n", s);
546
547 /* Search for INFTL MediaHeader and Spare INFTL Media Header */
548 if (find_boot_record(s) < 0) {
549 printk(KERN_WARNING "INFTL: could not find valid boot record?\n");
550 return -ENXIO;
551 }
552
553 /* Init the logical to physical table */
554 for (i = 0; i < s->nb_blocks; i++)
555 s->VUtable[i] = BLOCK_NIL;
556
557 logical_block = block = BLOCK_NIL;
558
559 /* Temporary buffer to store ANAC numbers. */
560 ANACtable = kcalloc(s->nb_blocks, sizeof(u8), GFP_KERNEL);
561 if (!ANACtable) {
562 printk(KERN_WARNING "INFTL: allocation of ANACtable "
563 "failed (%zd bytes)\n",
564 s->nb_blocks * sizeof(u8));
565 return -ENOMEM;
566 }
567
568 /*
569 * First pass is to explore each physical unit, and construct the
570 * virtual chains that exist (newest physical unit goes into VUtable).
571 * Any block that is in any way invalid will be left in the
572 * NOTEXPLORED state. Then at the end we will try to format it and
573 * mark it as free.
574 */
575 pr_debug("INFTL: pass 1, explore each unit\n");
576 for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) {
577 if (s->PUtable[first_block] != BLOCK_NOTEXPLORED)
578 continue;
579
580 do_format_chain = 0;
581 first_logical_block = BLOCK_NIL;
582 last_block = BLOCK_NIL;
583 block = first_block;
584
585 for (chain_length = 0; ; chain_length++) {
586
587 if ((chain_length == 0) &&
588 (s->PUtable[block] != BLOCK_NOTEXPLORED)) {
589 /* Nothing to do here, onto next block */
590 break;
591 }
592
593 if (inftl_read_oob(mtd, block * s->EraseSize + 8,
594 8, &retlen, (char *)&h0) < 0 ||
595 inftl_read_oob(mtd, block * s->EraseSize +
596 2 * SECTORSIZE + 8, 8, &retlen,
597 (char *)&h1) < 0) {
598 /* Should never happen? */
599 do_format_chain++;
600 break;
601 }
602
603 logical_block = le16_to_cpu(h0.virtualUnitNo);
604 prev_block = le16_to_cpu(h0.prevUnitNo);
605 erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1));
606 ANACtable[block] = h0.ANAC;
607
608 /* Previous block is relative to start of Partition */
609 if (prev_block < s->nb_blocks)
610 prev_block += s->firstEUN;
611
612 /* Already explored partial chain? */
613 if (s->PUtable[block] != BLOCK_NOTEXPLORED) {
614 /* Check if chain for this logical */
615 if (logical_block == first_logical_block) {
616 if (last_block != BLOCK_NIL)
617 s->PUtable[last_block] = block;
618 }
619 break;
620 }
621
622 /* Check for invalid block */
623 if (erase_mark != ERASE_MARK) {
624 printk(KERN_WARNING "INFTL: corrupt block %d "
625 "in chain %d, chain length %d, erase "
626 "mark 0x%x?\n", block, first_block,
627 chain_length, erase_mark);
628 /*
629 * Assume end of chain, probably incomplete
630 * fold/erase...
631 */
632 if (chain_length == 0)
633 do_format_chain++;
634 break;
635 }
636
637 /* Check for it being free already then... */
638 if ((logical_block == BLOCK_FREE) ||
639 (logical_block == BLOCK_NIL)) {
640 s->PUtable[block] = BLOCK_FREE;
641 break;
642 }
643
644 /* Sanity checks on block numbers */
645 if ((logical_block >= s->nb_blocks) ||
646 ((prev_block >= s->nb_blocks) &&
647 (prev_block != BLOCK_NIL))) {
648 if (chain_length > 0) {
649 printk(KERN_WARNING "INFTL: corrupt "
650 "block %d in chain %d?\n",
651 block, first_block);
652 do_format_chain++;
653 }
654 break;
655 }
656
657 if (first_logical_block == BLOCK_NIL) {
658 first_logical_block = logical_block;
659 } else {
660 if (first_logical_block != logical_block) {
661 /* Normal for folded chain... */
662 break;
663 }
664 }
665
666 /*
667 * Current block is valid, so if we followed a virtual
668 * chain to get here then we can set the previous
669 * block pointer in our PUtable now. Then move onto
670 * the previous block in the chain.
671 */
672 s->PUtable[block] = BLOCK_NIL;
673 if (last_block != BLOCK_NIL)
674 s->PUtable[last_block] = block;
675 last_block = block;
676 block = prev_block;
677
678 /* Check for end of chain */
679 if (block == BLOCK_NIL)
680 break;
681
682 /* Validate next block before following it... */
683 if (block > s->lastEUN) {
684 printk(KERN_WARNING "INFTL: invalid previous "
685 "block %d in chain %d?\n", block,
686 first_block);
687 do_format_chain++;
688 break;
689 }
690 }
691
692 if (do_format_chain) {
693 format_chain(s, first_block);
694 continue;
695 }
696
697 /*
698 * Looks like a valid chain then. It may not really be the
699 * newest block in the chain, but it is the newest we have
700 * found so far. We might update it in later iterations of
701 * this loop if we find something newer.
702 */
703 s->VUtable[first_logical_block] = first_block;
704 logical_block = BLOCK_NIL;
705 }
706
707 INFTL_dumptables(s);
708
709 /*
710 * Second pass, check for infinite loops in chains. These are
711 * possible because we don't update the previous pointers when
712 * we fold chains. No big deal, just fix them up in PUtable.
713 */
714 pr_debug("INFTL: pass 2, validate virtual chains\n");
715 for (logical_block = 0; logical_block < s->numvunits; logical_block++) {
716 block = s->VUtable[logical_block];
717 last_block = BLOCK_NIL;
718
719 /* Check for free/reserved/nil */
720 if (block >= BLOCK_RESERVED)
721 continue;
722
723 ANAC = ANACtable[block];
724 for (i = 0; i < s->numvunits; i++) {
725 if (s->PUtable[block] == BLOCK_NIL)
726 break;
727 if (s->PUtable[block] > s->lastEUN) {
728 printk(KERN_WARNING "INFTL: invalid prev %d, "
729 "in virtual chain %d\n",
730 s->PUtable[block], logical_block);
731 s->PUtable[block] = BLOCK_NIL;
732
733 }
734 if (ANACtable[block] != ANAC) {
735 /*
736 * Chain must point back to itself. This is ok,
737 * but we will need adjust the tables with this
738 * newest block and oldest block.
739 */
740 s->VUtable[logical_block] = block;
741 s->PUtable[last_block] = BLOCK_NIL;
742 break;
743 }
744
745 ANAC--;
746 last_block = block;
747 block = s->PUtable[block];
748 }
749
750 if (i >= s->nb_blocks) {
751 /*
752 * Uhoo, infinite chain with valid ANACS!
753 * Format whole chain...
754 */
755 format_chain(s, first_block);
756 }
757 }
758
759 INFTL_dumptables(s);
760 INFTL_dumpVUchains(s);
761
762 /*
763 * Third pass, format unreferenced blocks and init free block count.
764 */
765 s->numfreeEUNs = 0;
766 s->LastFreeEUN = BLOCK_NIL;
767
768 pr_debug("INFTL: pass 3, format unused blocks\n");
769 for (block = s->firstEUN; block <= s->lastEUN; block++) {
770 if (s->PUtable[block] == BLOCK_NOTEXPLORED) {
771 printk("INFTL: unreferenced block %d, formatting it\n",
772 block);
773 if (INFTL_formatblock(s, block) < 0)
774 s->PUtable[block] = BLOCK_RESERVED;
775 else
776 s->PUtable[block] = BLOCK_FREE;
777 }
778 if (s->PUtable[block] == BLOCK_FREE) {
779 s->numfreeEUNs++;
780 if (s->LastFreeEUN == BLOCK_NIL)
781 s->LastFreeEUN = block;
782 }
783 }
784
785 kfree(ANACtable);
786 return 0;
787 }