summaryrefslogtreecommitdiff
path: root/fs/jffs2/jffs2_1pass.c
blob: 93651f53e9242d9c2e51672383c9a69d234f6c18 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
/*
-------------------------------------------------------------------------
 * Filename:      jffs2.c
 * Version:       $Id: jffs2_1pass.c,v 1.7 2002/01/25 01:56:47 nyet Exp $
 * Copyright:     Copyright (C) 2001, Russ Dill
 * Author:        Russ Dill <Russ.Dill@asu.edu>
 * Description:   Module to load kernel from jffs2
 *-----------------------------------------------------------------------*/
/*
 * some portions of this code are taken from jffs2, and as such, the
 * following copyright notice is included.
 *
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
 *
 * The original JFFS, from which the design for JFFS2 was derived,
 * was designed and implemented by Axis Communications AB.
 *
 * The contents of this file are subject to the Red Hat eCos Public
 * License Version 1.1 (the "Licence"); you may not use this file
 * except in compliance with the Licence.  You may obtain a copy of
 * the Licence at http://www.redhat.com/
 *
 * Software distributed under the Licence is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing rights and
 * limitations under the Licence.
 *
 * The Original Code is JFFS2 - Journalling Flash File System, version 2
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License version 2 (the "GPL"), in
 * which case the provisions of the GPL are applicable instead of the
 * above.  If you wish to allow the use of your version of this file
 * only under the terms of the GPL and not to allow others to use your
 * version of this file under the RHEPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GPL.  If you do not delete the
 * provisions above, a recipient may use your version of this file
 * under either the RHEPL or the GPL.
 *
 * $Id: jffs2_1pass.c,v 1.7 2002/01/25 01:56:47 nyet Exp $
 *
 */

/* Ok, so anyone who knows the jffs2 code will probably want to get a papar
 * bag to throw up into before reading this code. I looked through the jffs2
 * code, the caching scheme is very elegant. I tried to keep the version
 * for a bootloader as small and simple as possible. Instead of worring about
 * unneccesary data copies, node scans, etc, I just optimized for the known
 * common case, a kernel, which looks like:
 *	(1) most pages are 4096 bytes
 *	(2) version numbers are somewhat sorted in acsending order
 *	(3) multiple compressed blocks making up one page is uncommon
 *
 * So I create a linked list of decending version numbers (insertions at the
 * head), and then for each page, walk down the list, until a matching page
 * with 4096 bytes is found, and then decompress the watching pages in
 * reverse order.
 *
 */

/*
 * Adapted by Nye Liu <nyet@zumanetworks.com> and
 * Rex Feany <rfeany@zumanetworks.com>
 * on Jan/2002 for U-Boot.
 *
 * Clipped out all the non-1pass functions, cleaned up warnings,
 * wrappers, etc. No major changes to the code.
 * Please, he really means it when he said have a paper bag
 * handy. We needed it ;).
 *
 */

/*
 * Bugfixing by Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de>, (C) Mar/2003
 *
 * - overhaul of the memory management. Removed much of the "paper-bagging"
 *   in that part of the code, fixed several bugs, now frees memory when
 *   partition is changed.
 *   It's still ugly :-(
 * - fixed a bug in jffs2_1pass_read_inode where the file length calculation
 *   was incorrect. Removed a bit of the paper-bagging as well.
 * - removed double crc calculation for fragment headers in jffs2_private.h
 *   for speedup.
 * - scan_empty rewritten in a more "standard" manner (non-paperbag, that is).
 * - spinning wheel now spins depending on how much memory has been scanned
 * - lots of small changes all over the place to "improve" readability.
 * - implemented fragment sorting to ensure that the newest data is copied
 *   if there are multiple copies of fragments for a certain file offset.
 *
 * The fragment sorting feature must be enabled by CONFIG_SYS_JFFS2_SORT_FRAGMENTS.
 * Sorting is done while adding fragments to the lists, which is more or less a
 * bubble sort. This takes a lot of time, and is most probably not an issue if
 * the boot filesystem is always mounted readonly.
 *
 * You should define it if the boot filesystem is mounted writable, and updates
 * to the boot files are done by copying files to that filesystem.
 *
 *
 * There's a big issue left: endianess is completely ignored in this code. Duh!
 *
 *
 * You still should have paper bags at hand :-(. The code lacks more or less
 * any comment, and is still arcane and difficult to read in places. As this
 * might be incompatible with any new code from the jffs2 maintainers anyway,
 * it should probably be dumped and replaced by something like jffs2reader!
 */


#include <common.h>
#include <config.h>
#include <malloc.h>
#include <linux/stat.h>
#include <linux/time.h>
#include <watchdog.h>
#include <jffs2/jffs2.h>
#include <jffs2/jffs2_1pass.h>
#include <linux/mtd/compat.h>
#include <asm/errno.h>

#include "jffs2_private.h"


#define	NODE_CHUNK	1024	/* size of memory allocation chunk in b_nodes */
#define	SPIN_BLKSIZE	18	/* spin after having scanned 1<<BLKSIZE bytes */

/* Debugging switches */
#undef	DEBUG_DIRENTS		/* print directory entry list after scan */
#undef	DEBUG_FRAGMENTS		/* print fragment list after scan */
#undef	DEBUG			/* enable debugging messages */


#ifdef  DEBUG
# define DEBUGF(fmt,args...)	printf(fmt ,##args)
#else
# define DEBUGF(fmt,args...)
#endif

#include "summary.h"

/* keeps pointer to currentlu processed partition */
static struct part_info *current_part;

#if (defined(CONFIG_JFFS2_NAND) && \
     defined(CONFIG_CMD_NAND) )
#include <nand.h>
/*
 * Support for jffs2 on top of NAND-flash
 *
 * NAND memory isn't mapped in processor's address space,
 * so data should be fetched from flash before
 * being processed. This is exactly what functions declared
 * here do.
 *
 */

#define NAND_PAGE_SIZE 512
#define NAND_PAGE_SHIFT 9
#define NAND_PAGE_MASK (~(NAND_PAGE_SIZE-1))

#ifndef NAND_CACHE_PAGES
#define NAND_CACHE_PAGES 16
#endif
#define NAND_CACHE_SIZE (NAND_CACHE_PAGES*NAND_PAGE_SIZE)

static u8* nand_cache = NULL;
static u32 nand_cache_off = (u32)-1;

static int read_nand_cached(u32 off, u32 size, u_char *buf)
{
	struct mtdids *id = current_part->dev->id;
	u32 bytes_read = 0;
	size_t retlen;
	int cpy_bytes;

	while (bytes_read < size) {
		if ((off + bytes_read < nand_cache_off) ||
		    (off + bytes_read >= nand_cache_off+NAND_CACHE_SIZE)) {
			nand_cache_off = (off + bytes_read) & NAND_PAGE_MASK;
			if (!nand_cache) {
				/* This memory never gets freed but 'cause
				   it's a bootloader, nobody cares */
				nand_cache = malloc(NAND_CACHE_SIZE);
				if (!nand_cache) {
					printf("read_nand_cached: can't alloc cache size %d bytes\n",
					       NAND_CACHE_SIZE);
					return -1;
				}
			}

			retlen = NAND_CACHE_SIZE;
			if (nand_read(&nand_info[id->num], nand_cache_off,
						&retlen, nand_cache) != 0 ||
					retlen != NAND_CACHE_SIZE) {
				printf("read_nand_cached: error reading nand off %#x size %d bytes\n",
						nand_cache_off, NAND_CACHE_SIZE);
				return -1;
			}
		}
		cpy_bytes = nand_cache_off + NAND_CACHE_SIZE - (off + bytes_read);
		if (cpy_bytes > size - bytes_read)
			cpy_bytes = size - bytes_read;
		memcpy(buf + bytes_read,
		       nand_cache + off + bytes_read - nand_cache_off,
		       cpy_bytes);
		bytes_read += cpy_bytes;
	}
	return bytes_read;
}

static void *get_fl_mem_nand(u32 off, u32 size, void *ext_buf)
{
	u_char *buf = ext_buf ? (u_char*)ext_buf : (u_char*)malloc(size);

	if (NULL == buf) {
		printf("get_fl_mem_nand: can't alloc %d bytes\n", size);
		return NULL;
	}
	if (read_nand_cached(off, size, buf) < 0) {
		if (!ext_buf)
			free(buf);
		return NULL;
	}

	return buf;
}

static void *get_node_mem_nand(u32 off, void *ext_buf)
{
	struct jffs2_unknown_node node;
	void *ret = NULL;

	if (NULL == get_fl_mem_nand(off, sizeof(node), &node))
		return NULL;

	if (!(ret = get_fl_mem_nand(off, node.magic ==
			       JFFS2_MAGIC_BITMASK ? node.totlen : sizeof(node),
			       ext_buf))) {
		printf("off = %#x magic %#x type %#x node.totlen = %d\n",
		       off, node.magic, node.nodetype, node.totlen);
	}
	return ret;
}

static void put_fl_mem_nand(void *buf)
{
	free(buf);
}
#endif

#if defined(CONFIG_CMD_ONENAND)

#include <linux/mtd/mtd.h>
#include <linux/mtd/onenand.h>
#include <onenand_uboot.h>

#define ONENAND_PAGE_SIZE 2048
#define ONENAND_PAGE_SHIFT 11
#define ONENAND_PAGE_MASK (~(ONENAND_PAGE_SIZE-1))

#ifndef ONENAND_CACHE_PAGES
#define ONENAND_CACHE_PAGES 4
#endif
#define ONENAND_CACHE_SIZE (ONENAND_CACHE_PAGES*ONENAND_PAGE_SIZE)

static u8* onenand_cache;
static u32 onenand_cache_off = (u32)-1;

static int read_onenand_cached(u32 off, u32 size, u_char *buf)
{
	u32 bytes_read = 0;
	size_t retlen;
	int cpy_bytes;

	while (bytes_read < size) {
		if ((off + bytes_read < onenand_cache_off) ||
		    (off + bytes_read >= onenand_cache_off + ONENAND_CACHE_SIZE)) {
			onenand_cache_off = (off + bytes_read) & ONENAND_PAGE_MASK;
			if (!onenand_cache) {
				/* This memory never gets freed but 'cause
				   it's a bootloader, nobody cares */
				onenand_cache = malloc(ONENAND_CACHE_SIZE);
				if (!onenand_cache) {
					printf("read_onenand_cached: can't alloc cache size %d bytes\n",
					       ONENAND_CACHE_SIZE);
					return -1;
				}
			}

			retlen = ONENAND_CACHE_SIZE;
			if (onenand_read(&onenand_mtd, onenand_cache_off, retlen,
						&retlen, onenand_cache) != 0 ||
					retlen != ONENAND_CACHE_SIZE) {
				printf("read_onenand_cached: error reading nand off %#x size %d bytes\n",
					onenand_cache_off, ONENAND_CACHE_SIZE);
				return -1;
			}
		}
		cpy_bytes = onenand_cache_off + ONENAND_CACHE_SIZE - (off + bytes_read);
		if (cpy_bytes > size - bytes_read)
			cpy_bytes = size - bytes_read;
		memcpy(buf + bytes_read,
		       onenand_cache + off + bytes_read - onenand_cache_off,
		       cpy_bytes);
		bytes_read += cpy_bytes;
	}
	return bytes_read;
}

static void *get_fl_mem_onenand(u32 off, u32 size, void *ext_buf)
{
	u_char *buf = ext_buf ? (u_char *)ext_buf : (u_char *)malloc(size);

	if (NULL == buf) {
		printf("get_fl_mem_onenand: can't alloc %d bytes\n", size);
		return NULL;
	}
	if (read_onenand_cached(off, size, buf) < 0) {
		if (!ext_buf)
			free(buf);
		return NULL;
	}

	return buf;
}

static void *get_node_mem_onenand(u32 off, void *ext_buf)
{
	struct jffs2_unknown_node node;
	void *ret = NULL;

	if (NULL == get_fl_mem_onenand(off, sizeof(node), &node))
		return NULL;

	ret = get_fl_mem_onenand(off, node.magic ==
			JFFS2_MAGIC_BITMASK ? node.totlen : sizeof(node),
			ext_buf);
	if (!ret) {
		printf("off = %#x magic %#x type %#x node.totlen = %d\n",
		       off, node.magic, node.nodetype, node.totlen);
	}
	return ret;
}


static void put_fl_mem_onenand(void *buf)
{
	free(buf);
}
#endif


#if defined(CONFIG_CMD_FLASH)
/*
 * Support for jffs2 on top of NOR-flash
 *
 * NOR flash memory is mapped in processor's address space,
 * just return address.
 */
static inline void *get_fl_mem_nor(u32 off, u32 size, void *ext_buf)
{
	u32 addr = off;
	struct mtdids *id = current_part->dev->id;

	extern flash_info_t flash_info[];
	flash_info_t *flash = &flash_info[id->num];

	addr += flash->start[0];
	if (ext_buf) {
		memcpy(ext_buf, (void *)addr, size);
		return ext_buf;
	}
	return (void*)addr;
}

static inline void *get_node_mem_nor(u32 off, void *ext_buf)
{
	struct jffs2_unknown_node *pNode;

	/* pNode will point directly to flash - don't provide external buffer
	   and don't care about size */
	pNode = get_fl_mem_nor(off, 0, NULL);
	return (void *)get_fl_mem_nor(off, pNode->magic == JFFS2_MAGIC_BITMASK ?
			pNode->totlen : sizeof(*pNode), ext_buf);
}
#endif


/*
 * Generic jffs2 raw memory and node read routines.
 *
 */
static inline void *get_fl_mem(u32 off, u32 size, void *ext_buf)
{
	struct mtdids *id = current_part->dev->id;

#if defined(CONFIG_CMD_FLASH)
	if (id->type == MTD_DEV_TYPE_NOR) {
		return get_fl_mem_nor(off, size, ext_buf);
	}
#endif

#if defined(CONFIG_JFFS2_NAND) && defined(CONFIG_CMD_NAND)
	if (id->type == MTD_DEV_TYPE_NAND)
		return get_fl_mem_nand(off, size, ext_buf);
#endif

#if defined(CONFIG_CMD_ONENAND)
	if (id->type == MTD_DEV_TYPE_ONENAND)
		return get_fl_mem_onenand(off, size, ext_buf);
#endif

	printf("get_fl_mem: unknown device type, using raw offset!\n");
	return (void*)off;
}

static inline void *get_node_mem(u32 off, void *ext_buf)
{
	struct mtdids *id = current_part->dev->id;

#if defined(CONFIG_CMD_FLASH)
	if (id->type == MTD_DEV_TYPE_NOR)
		return get_node_mem_nor(off, ext_buf);
#endif

#if defined(CONFIG_JFFS2_NAND) && \
    defined(CONFIG_CMD_NAND)
	if (id->type == MTD_DEV_TYPE_NAND)
		return get_node_mem_nand(off, ext_buf);
#endif

#if defined(CONFIG_CMD_ONENAND)
	if (id->type == MTD_DEV_TYPE_ONENAND)
		return get_node_mem_onenand(off, ext_buf);
#endif

	printf("get_node_mem: unknown device type, using raw offset!\n");
	return (void*)off;
}

static inline void put_fl_mem(void *buf, void *ext_buf)
{
	struct mtdids *id = current_part->dev->id;

	/* If buf is the same as ext_buf, it was provided by the caller -
	   we shouldn't free it then. */
	if (buf == ext_buf)
		return;
	switch (id->type) {
#if defined(CONFIG_JFFS2_NAND) && defined(CONFIG_CMD_NAND)
	case MTD_DEV_TYPE_NAND:
		return put_fl_mem_nand(buf);
#endif
#if defined(CONFIG_CMD_ONENAND)
	case MTD_DEV_TYPE_ONENAND:
		return put_fl_mem_onenand(buf);
#endif
	}
}

/* Compression names */
static char *compr_names[] = {
	"NONE",
	"ZERO",
	"RTIME",
	"RUBINMIPS",
	"COPY",
	"DYNRUBIN",
	"ZLIB",
#if defined(CONFIG_JFFS2_LZO)
	"LZO",
#endif
};

/* Memory management */
struct mem_block {
	u32	index;
	struct mem_block *next;
	struct b_node nodes[NODE_CHUNK];
};


static void
free_nodes(struct b_list *list)
{
	while (list->listMemBase != NULL) {
		struct mem_block *next = list->listMemBase->next;
		free( list->listMemBase );
		list->listMemBase = next;
	}
}

static struct b_node *
add_node(struct b_list *list)
{
	u32 index = 0;
	struct mem_block *memBase;
	struct b_node *b;

	memBase = list->listMemBase;
	if (memBase != NULL)
		index = memBase->index;
#if 0
	putLabeledWord("add_node: index = ", index);
	putLabeledWord("add_node: memBase = ", list->listMemBase);
#endif

	if (memBase == NULL || index >= NODE_CHUNK) {
		/* we need more space before we continue */
		memBase = mmalloc(sizeof(struct mem_block));
		if (memBase == NULL) {
			putstr("add_node: malloc failed\n");
			return NULL;
		}
		memBase->next = list->listMemBase;
		index = 0;
#if 0
		putLabeledWord("add_node: alloced a new membase at ", *memBase);
#endif

	}
	/* now we have room to add it. */
	b = &memBase->nodes[index];
	index ++;

	memBase->index = index;
	list->listMemBase = memBase;
	list->listCount++;
	return b;
}

static struct b_node *
insert_node(struct b_list *list, u32 offset)
{
	struct b_node *new;
#ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
	struct b_node *b, *prev;
#endif

	if (!(new = add_node(list))) {
		putstr("add_node failed!\r\n");
		return NULL;
	}
	new->offset = offset;

#ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
	if (list->listTail != NULL && list->listCompare(new, list->listTail))
		prev = list->listTail;
	else if (list->listLast != NULL && list->listCompare(new, list->listLast))
		prev = list->listLast;
	else
		prev = NULL;

	for (b = (prev ? prev->next : list->listHead);
	     b != NULL && list->listCompare(new, b);
	     prev = b, b = b->next) {
		list->listLoops++;
	}
	if (b != NULL)
		list->listLast = prev;

	if (b != NULL) {
		new->next = b;
		if (prev != NULL)
			prev->next = new;
		else
			list->listHead = new;
	} else
#endif
	{
		new->next = (struct b_node *) NULL;
		if (list->listTail != NULL) {
			list->listTail->next = new;
			list->listTail = new;
		} else {
			list->listTail = list->listHead = new;
		}
	}

	return new;
}

#ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
/* Sort data entries with the latest version last, so that if there
 * is overlapping data the latest version will be used.
 */
static int compare_inodes(struct b_node *new, struct b_node *old)
{
	struct jffs2_raw_inode ojNew;
	struct jffs2_raw_inode ojOld;
	struct jffs2_raw_inode *jNew =
		(struct jffs2_raw_inode *)get_fl_mem(new->offset, sizeof(ojNew), &ojNew);
	struct jffs2_raw_inode *jOld =
		(struct jffs2_raw_inode *)get_fl_mem(old->offset, sizeof(ojOld), &ojOld);

	return jNew->version > jOld->version;
}

/* Sort directory entries so all entries in the same directory
 * with the same name are grouped together, with the latest version
 * last. This makes it easy to eliminate all but the latest version
 * by marking the previous version dead by setting the inode to 0.
 */
static int compare_dirents(struct b_node *new, struct b_node *old)
{
	struct jffs2_raw_dirent ojNew;
	struct jffs2_raw_dirent ojOld;
	struct jffs2_raw_dirent *jNew =
		(struct jffs2_raw_dirent *)get_fl_mem(new->offset, sizeof(ojNew), &ojNew);
	struct jffs2_raw_dirent *jOld =
		(struct jffs2_raw_dirent *)get_fl_mem(old->offset, sizeof(ojOld), &ojOld);
	int cmp;

	/* ascending sort by pino */
	if (jNew->pino != jOld->pino)
		return jNew->pino > jOld->pino;

	/* pino is the same, so use ascending sort by nsize, so
	 * we don't do strncmp unless we really must.
	 */
	if (jNew->nsize != jOld->nsize)
		return jNew->nsize > jOld->nsize;

	/* length is also the same, so use ascending sort by name
	 */
	cmp = strncmp((char *)jNew->name, (char *)jOld->name, jNew->nsize);
	if (cmp != 0)
		return cmp > 0;

	/* we have duplicate names in this directory, so use ascending
	 * sort by version
	 */
	if (jNew->version > jOld->version) {
		/* since jNew is newer, we know jOld is not valid, so
		 * mark it with inode 0 and it will not be used
		 */
		jOld->ino = 0;
		return 1;
	}

	return 0;
}
#endif

void
jffs2_free_cache(struct part_info *part)
{
	struct b_lists *pL;

	if (part->jffs2_priv != NULL) {
		pL = (struct b_lists *)part->jffs2_priv;
		free_nodes(&pL->frag);
		free_nodes(&pL->dir);
		free(pL->readbuf);
		free(pL);
	}
}

static u32
jffs_init_1pass_list(struct part_info *part)
{
	struct b_lists *pL;

	jffs2_free_cache(part);

	if (NULL != (part->jffs2_priv = malloc(sizeof(struct b_lists)))) {
		pL = (struct b_lists *)part->jffs2_priv;

		memset(pL, 0, sizeof(*pL));
#ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
		pL->dir.listCompare = compare_dirents;
		pL->frag.listCompare = compare_inodes;
#endif
	}
	return 0;
}

/* find the inode from the slashless name given a parent */
static long
jffs2_1pass_read_inode(struct b_lists *pL, u32 inode, char *dest)
{
	struct b_node *b;
	struct jffs2_raw_inode *jNode;
	u32 totalSize = 0;
	u32 latestVersion = 0;
	uchar *lDest;
	uchar *src;
	long ret;
	int i;
	u32 counter = 0;
#ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
	/* Find file size before loading any data, so fragments that
	 * start past the end of file can be ignored. A fragment
	 * that is partially in the file is loaded, so extra data may
	 * be loaded up to the next 4K boundary above the file size.
	 * This shouldn't cause trouble when loading kernel images, so
	 * we will live with it.
	 */
	for (b = pL->frag.listHead; b != NULL; b = b->next) {
		jNode = (struct jffs2_raw_inode *) get_fl_mem(b->offset,
			sizeof(struct jffs2_raw_inode), pL->readbuf);
		if ((inode == jNode->ino)) {
			/* get actual file length from the newest node */
			if (jNode->version >= latestVersion) {
				totalSize = jNode->isize;
				latestVersion = jNode->version;
			}
		}
		put_fl_mem(jNode, pL->readbuf);
	}
#endif

	for (b = pL->frag.listHead; b != NULL; b = b->next) {
		jNode = (struct jffs2_raw_inode *) get_node_mem(b->offset,
								pL->readbuf);
		if ((inode == jNode->ino)) {
#if 0
			putLabeledWord("\r\n\r\nread_inode: totlen = ", jNode->totlen);
			putLabeledWord("read_inode: inode = ", jNode->ino);
			putLabeledWord("read_inode: version = ", jNode->version);
			putLabeledWord("read_inode: isize = ", jNode->isize);
			putLabeledWord("read_inode: offset = ", jNode->offset);
			putLabeledWord("read_inode: csize = ", jNode->csize);
			putLabeledWord("read_inode: dsize = ", jNode->dsize);
			putLabeledWord("read_inode: compr = ", jNode->compr);
			putLabeledWord("read_inode: usercompr = ", jNode->usercompr);
			putLabeledWord("read_inode: flags = ", jNode->flags);
#endif

#ifndef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
			/* get actual file length from the newest node */
			if (jNode->version >= latestVersion) {
				totalSize = jNode->isize;
				latestVersion = jNode->version;
			}
#endif

			if(dest) {
				src = ((uchar *) jNode) + sizeof(struct jffs2_raw_inode);
				/* ignore data behind latest known EOF */
				if (jNode->offset > totalSize) {
					put_fl_mem(jNode, pL->readbuf);
					continue;
				}
				if (b->datacrc == CRC_UNKNOWN)
					b->datacrc = data_crc(jNode) ?
						CRC_OK : CRC_BAD;
				if (b->datacrc == CRC_BAD) {
					put_fl_mem(jNode, pL->readbuf);
					continue;
				}

				lDest = (uchar *) (dest + jNode->offset);
#if 0
				putLabeledWord("read_inode: src = ", src);
				putLabeledWord("read_inode: dest = ", lDest);
#endif
				switch (jNode->compr) {
				case JFFS2_COMPR_NONE:
					ret = (unsigned long) ldr_memcpy(lDest, src, jNode->dsize);
					break;
				case JFFS2_COMPR_ZERO:
					ret = 0;
					for (i = 0; i < jNode->dsize; i++)
						*(lDest++) = 0;
					break;
				case JFFS2_COMPR_RTIME:
					ret = 0;
					rtime_decompress(src, lDest, jNode->csize, jNode->dsize);
					break;
				case JFFS2_COMPR_DYNRUBIN:
					/* this is slow but it works */
					ret = 0;
					dynrubin_decompress(src, lDest, jNode->csize, jNode->dsize);
					break;
				case JFFS2_COMPR_ZLIB:
					ret = zlib_decompress(src, lDest, jNode->csize, jNode->dsize);
					break;
#if defined(CONFIG_JFFS2_LZO)
				case JFFS2_COMPR_LZO:
					ret = lzo_decompress(src, lDest, jNode->csize, jNode->dsize);
					break;
#endif
				default:
					/* unknown */
					putLabeledWord("UNKOWN COMPRESSION METHOD = ", jNode->compr);
					put_fl_mem(jNode, pL->readbuf);
					return -1;
					break;
				}
			}

#if 0
			putLabeledWord("read_inode: totalSize = ", totalSize);
			putLabeledWord("read_inode: compr ret = ", ret);
#endif
		}
		counter++;
		put_fl_mem(jNode, pL->readbuf);
	}

#if 0
	putLabeledWord("read_inode: returning = ", totalSize);
#endif
	return totalSize;
}

/* find the inode from the slashless name given a parent */
static u32
jffs2_1pass_find_inode(struct b_lists * pL, const char *name, u32 pino)
{
	struct b_node *b;
	struct jffs2_raw_dirent *jDir;
	int len;
	u32 counter;
	u32 version = 0;
	u32 inode = 0;

	/* name is assumed slash free */
	len = strlen(name);

	counter = 0;
	/* we need to search all and return the inode with the highest version */
	for(b = pL->dir.listHead; b; b = b->next, counter++) {
		jDir = (struct jffs2_raw_dirent *) get_node_mem(b->offset,
								pL->readbuf);
		if ((pino == jDir->pino) && (len == jDir->nsize) &&
		    (jDir->ino) &&	/* 0 for unlink */
		    (!strncmp((char *)jDir->name, name, len))) {	/* a match */
			if (jDir->version < version) {
				put_fl_mem(jDir, pL->readbuf);
				continue;
			}

			if (jDir->version == version && inode != 0) {
				/* I'm pretty sure this isn't legal */
				putstr(" ** ERROR ** ");
				putnstr(jDir->name, jDir->nsize);
				putLabeledWord(" has dup version =", version);
			}
			inode = jDir->ino;
			version = jDir->version;
		}
#if 0
		putstr("\r\nfind_inode:p&l ->");
		putnstr(jDir->name, jDir->nsize);
		putstr("\r\n");
		putLabeledWord("pino = ", jDir->pino);
		putLabeledWord("nsize = ", jDir->nsize);
		putLabeledWord("b = ", (u32) b);
		putLabeledWord("counter = ", counter);
#endif
		put_fl_mem(jDir, pL->readbuf);
	}
	return inode;
}

char *mkmodestr(unsigned long mode, char *str)
{
	static const char *l = "xwr";
	int mask = 1, i;
	char c;

	switch (mode & S_IFMT) {
		case S_IFDIR:    str[0] = 'd'; break;
		case S_IFBLK:    str[0] = 'b'; break;
		case S_IFCHR:    str[0] = 'c'; break;
		case S_IFIFO:    str[0] = 'f'; break;
		case S_IFLNK:    str[0] = 'l'; break;
		case S_IFSOCK:   str[0] = 's'; break;
		case S_IFREG:    str[0] = '-'; break;
		default:         str[0] = '?';
	}

	for(i = 0; i < 9; i++) {
		c = l[i%3];
		str[9-i] = (mode & mask)?c:'-';
		mask = mask<<1;
	}

	if(mode & S_ISUID) str[3] = (mode & S_IXUSR)?'s':'S';
	if(mode & S_ISGID) str[6] = (mode & S_IXGRP)?'s':'S';
	if(mode & S_ISVTX) str[9] = (mode & S_IXOTH)?'t':'T';
	str[10] = '\0';
	return str;
}

static inline void dump_stat(struct stat *st, const char *name)
{
	char str[20];
	char s[64], *p;

	if (st->st_mtime == (time_t)(-1)) /* some ctimes really hate -1 */
		st->st_mtime = 1;

	ctime_r((time_t *)&st->st_mtime, s/*,64*/); /* newlib ctime doesn't have buflen */

	if ((p = strchr(s,'\n')) != NULL) *p = '\0';
	if ((p = strchr(s,'\r')) != NULL) *p = '\0';

/*
	printf("%6lo %s %8ld %s %s\n", st->st_mode, mkmodestr(st->st_mode, str),
		st->st_size, s, name);
*/

	printf(" %s %8ld %s %s", mkmodestr(st->st_mode,str), st->st_size, s, name);
}

static inline u32 dump_inode(struct b_lists * pL, struct jffs2_raw_dirent *d, struct jffs2_raw_inode *i)
{
	char fname[256];
	struct stat st;

	if(!d || !i) return -1;

	strncpy(fname, (char *)d->name, d->nsize);
	fname[d->nsize] = '\0';

	memset(&st,0,sizeof(st));

	st.st_mtime = i->mtime;
	st.st_mode = i->mode;
	st.st_ino = i->ino;
	st.st_size = i->isize;

	dump_stat(&st, fname);

	if (d->type == DT_LNK) {
		unsigned char *src = (unsigned char *) (&i[1]);
	        putstr(" -> ");
		putnstr(src, (int)i->dsize);
	}

	putstr("\r\n");

	return 0;
}

/* list inodes with the given pino */
static u32
jffs2_1pass_list_inodes(struct b_lists * pL, u32 pino)
{
	struct b_node *b;
	struct jffs2_raw_dirent *jDir;

	for (b = pL->dir.listHead; b; b = b->next) {
		jDir = (struct jffs2_raw_dirent *) get_node_mem(b->offset,
								pL->readbuf);
		if ((pino == jDir->pino) && (jDir->ino)) { /* ino=0 -> unlink */
			u32 i_version = 0;
			struct jffs2_raw_inode ojNode;
			struct jffs2_raw_inode *jNode, *i = NULL;
			struct b_node *b2 = pL->frag.listHead;

			while (b2) {
				jNode = (struct jffs2_raw_inode *)
					get_fl_mem(b2->offset, sizeof(ojNode), &ojNode);
				if (jNode->ino == jDir->ino && jNode->version >= i_version) {
					i_version = jNode->version;
					if (i)
						put_fl_mem(i, NULL);

					if (jDir->type == DT_LNK)
						i = get_node_mem(b2->offset,
								 NULL);
					else
						i = get_fl_mem(b2->offset,
							       sizeof(*i),
							       NULL);
				}
				b2 = b2->next;
			}

			dump_inode(pL, jDir, i);
			put_fl_mem(i, NULL);
		}
		put_fl_mem(jDir, pL->readbuf);
	}
	return pino;
}

static u32
jffs2_1pass_search_inode(struct b_lists * pL, const char *fname, u32 pino)
{
	int i;
	char tmp[256];
	char working_tmp[256];
	char *c;

	/* discard any leading slash */
	i = 0;
	while (fname[i] == '/')
		i++;
	strcpy(tmp, &fname[i]);

	while ((c = (char *) strchr(tmp, '/')))	/* we are still dired searching */
	{
		strncpy(working_tmp, tmp, c - tmp);
		working_tmp[c - tmp] = '\0';
#if 0
		putstr("search_inode: tmp = ");
		putstr(tmp);
		putstr("\r\n");
		putstr("search_inode: wtmp = ");
		putstr(working_tmp);
		putstr("\r\n");
		putstr("search_inode: c = ");
		putstr(c);
		putstr("\r\n");
#endif
		for (i = 0; i < strlen(c) - 1; i++)
			tmp[i] = c[i + 1];
		tmp[i] = '\0';
#if 0
		putstr("search_inode: post tmp = ");
		putstr(tmp);
		putstr("\r\n");
#endif

		if (!(pino = jffs2_1pass_find_inode(pL, working_tmp, pino))) {
			putstr("find_inode failed for name=");
			putstr(working_tmp);
			putstr("\r\n");
			return 0;
		}
	}
	/* this is for the bare filename, directories have already been mapped */
	if (!(pino = jffs2_1pass_find_inode(pL, tmp, pino))) {
		putstr("find_inode failed for name=");
		putstr(tmp);
		putstr("\r\n");
		return 0;
	}
	return pino;

}

static u32
jffs2_1pass_resolve_inode(struct b_lists * pL, u32 ino)
{
	struct b_node *b;
	struct b_node *b2;
	struct jffs2_raw_dirent *jDir;
	struct jffs2_raw_inode *jNode;
	u8 jDirFoundType = 0;
	u32 jDirFoundIno = 0;
	u32 jDirFoundPino = 0;
	char tmp[256];
	u32 version = 0;
	u32 pino;
	unsigned char *src;

	/* we need to search all and return the inode with the highest version */
	for(b = pL->dir.listHead; b; b = b->next) {
		jDir = (struct jffs2_raw_dirent *) get_node_mem(b->offset,
								pL->readbuf);
		if (ino == jDir->ino) {
			if (jDir->version < version) {
				put_fl_mem(jDir, pL->readbuf);
				continue;
			}

			if (jDir->version == version && jDirFoundType) {
				/* I'm pretty sure this isn't legal */
				putstr(" ** ERROR ** ");
				putnstr(jDir->name, jDir->nsize);
				putLabeledWord(" has dup version (resolve) = ",
					version);
			}

			jDirFoundType = jDir->type;
			jDirFoundIno = jDir->ino;
			jDirFoundPino = jDir->pino;
			version = jDir->version;
		}
		put_fl_mem(jDir, pL->readbuf);
	}
	/* now we found the right entry again. (shoulda returned inode*) */
	if (jDirFoundType != DT_LNK)
		return jDirFoundIno;

	/* it's a soft link so we follow it again. */
	b2 = pL->frag.listHead;
	while (b2) {
		jNode = (struct jffs2_raw_inode *) get_node_mem(b2->offset,
								pL->readbuf);
		if (jNode->ino == jDirFoundIno) {
			src = (unsigned char *)jNode + sizeof(struct jffs2_raw_inode);

#if 0
			putLabeledWord("\t\t dsize = ", jNode->dsize);
			putstr("\t\t target = ");
			putnstr(src, jNode->dsize);
			putstr("\r\n");
#endif
			strncpy(tmp, (char *)src, jNode->dsize);
			tmp[jNode->dsize] = '\0';
			put_fl_mem(jNode, pL->readbuf);
			break;
		}
		b2 = b2->next;
		put_fl_mem(jNode, pL->readbuf);
	}
	/* ok so the name of the new file to find is in tmp */
	/* if it starts with a slash it is root based else shared dirs */
	if (tmp[0] == '/')
		pino = 1;
	else
		pino = jDirFoundPino;

	return jffs2_1pass_search_inode(pL, tmp, pino);
}

static u32
jffs2_1pass_search_list_inodes(struct b_lists * pL, const char *fname, u32 pino)
{
	int i;
	char tmp[256];
	char working_tmp[256];
	char *c;

	/* discard any leading slash */
	i = 0;
	while (fname[i] == '/')
		i++;
	strcpy(tmp, &fname[i]);
	working_tmp[0] = '\0';
	while ((c = (char *) strchr(tmp, '/')))	/* we are still dired searching */
	{
		strncpy(working_tmp, tmp, c - tmp);
		working_tmp[c - tmp] = '\0';
		for (i = 0; i < strlen(c) - 1; i++)
			tmp[i] = c[i + 1];
		tmp[i] = '\0';
		/* only a failure if we arent looking at top level */
		if (!(pino = jffs2_1pass_find_inode(pL, working_tmp, pino)) &&
		    (working_tmp[0])) {
			putstr("find_inode failed for name=");
			putstr(working_tmp);
			putstr("\r\n");
			return 0;
		}
	}

	if (tmp[0] && !(pino = jffs2_1pass_find_inode(pL, tmp, pino))) {
		putstr("find_inode failed for name=");
		putstr(tmp);
		putstr("\r\n");
		return 0;
	}
	/* this is for the bare filename, directories have already been mapped */
	if (!(pino = jffs2_1pass_list_inodes(pL, pino))) {
		putstr("find_inode failed for name=");
		putstr(tmp);
		putstr("\r\n");
		return 0;
	}
	return pino;

}

unsigned char
jffs2_1pass_rescan_needed(struct part_info *part)
{
	struct b_node *b;
	struct jffs2_unknown_node onode;
	struct jffs2_unknown_node *node;
	struct b_lists *pL = (struct b_lists *)part->jffs2_priv;

	if (part->jffs2_priv == 0){
		DEBUGF ("rescan: First time in use\n");
		return 1;
	}

	/* if we have no list, we need to rescan */
	if (pL->frag.listCount == 0) {
		DEBUGF ("rescan: fraglist zero\n");
		return 1;
	}

	/* but suppose someone reflashed a partition at the same offset... */
	b = pL->dir.listHead;
	while (b) {
		node = (struct jffs2_unknown_node *) get_fl_mem(b->offset,
			sizeof(onode), &onode);
		if (node->nodetype != JFFS2_NODETYPE_DIRENT) {
			DEBUGF ("rescan: fs changed beneath me? (%lx)\n",
					(unsigned long) b->offset);
			return 1;
		}
		b = b->next;
	}
	return 0;
}

#ifdef CONFIG_JFFS2_SUMMARY
static u32 sum_get_unaligned32(u32 *ptr)
{
	u32 val;
	u8 *p = (u8 *)ptr;

	val = *p | (*(p + 1) << 8) | (*(p + 2) << 16) | (*(p + 3) << 24);

	return __le32_to_cpu(val);
}

static u16 sum_get_unaligned16(u16 *ptr)
{
	u16 val;
	u8 *p = (u8 *)ptr;

	val = *p | (*(p + 1) << 8);

	return __le16_to_cpu(val);
}

#define dbg_summary(...) do {} while (0);
/*
 * Process the stored summary information - helper function for
 * jffs2_sum_scan_sumnode()
 */

static int jffs2_sum_process_sum_data(struct part_info *part, uint32_t offset,
				struct jffs2_raw_summary *summary,
				struct b_lists *pL)
{
	void *sp;
	int i, pass;
	void *ret;

	for (pass = 0; pass < 2; pass++) {
		sp = summary->sum;

		for (i = 0; i < summary->sum_num; i++) {
			struct jffs2_sum_unknown_flash *spu = sp;
			dbg_summary("processing summary index %d\n", i);

			switch (sum_get_unaligned16(&spu->nodetype)) {
				case JFFS2_NODETYPE_INODE: {
				struct jffs2_sum_inode_flash *spi;
					if (pass) {
						spi = sp;

						ret = insert_node(&pL->frag,
							(u32)part->offset +
							offset +
							sum_get_unaligned32(
								&spi->offset));
						if (ret == NULL)
							return -1;
					}

					sp += JFFS2_SUMMARY_INODE_SIZE;

					break;
				}
				case JFFS2_NODETYPE_DIRENT: {
					struct jffs2_sum_dirent_flash *spd;
					spd = sp;
					if (pass) {
						ret = insert_node(&pL->dir,
							(u32) part->offset +
							offset +
							sum_get_unaligned32(
								&spd->offset));
						if (ret == NULL)
							return -1;
					}

					sp += JFFS2_SUMMARY_DIRENT_SIZE(
							spd->nsize);

					break;
				}
				default : {
					uint16_t nodetype = sum_get_unaligned16(
								&spu->nodetype);
					printf("Unsupported node type %x found"
							" in summary!\n",
							nodetype);
					if ((nodetype & JFFS2_COMPAT_MASK) ==
							JFFS2_FEATURE_INCOMPAT)
						return -EIO;
					return -EBADMSG;
				}
			}
		}
	}
	return 0;
}

/* Process the summary node - called from jffs2_scan_eraseblock() */
int jffs2_sum_scan_sumnode(struct part_info *part, uint32_t offset,
			   struct jffs2_raw_summary *summary, uint32_t sumsize,
			   struct b_lists *pL)
{
	struct jffs2_unknown_node crcnode;
	int ret, ofs;
	uint32_t crc;

	ofs = part->sector_size - sumsize;

	dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
		    offset, offset + ofs, sumsize);

	/* OK, now check for node validity and CRC */
	crcnode.magic = JFFS2_MAGIC_BITMASK;
	crcnode.nodetype = JFFS2_NODETYPE_SUMMARY;
	crcnode.totlen = summary->totlen;
	crc = crc32_no_comp(0, (uchar *)&crcnode, sizeof(crcnode)-4);

	if (summary->hdr_crc != crc) {
		dbg_summary("Summary node header is corrupt (bad CRC or "
				"no summary at all)\n");
		goto crc_err;
	}

	if (summary->totlen != sumsize) {
		dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
		goto crc_err;
	}

	crc = crc32_no_comp(0, (uchar *)summary,
			sizeof(struct jffs2_raw_summary)-8);

	if (summary->node_crc != crc) {
		dbg_summary("Summary node is corrupt (bad CRC)\n");
		goto crc_err;
	}

	crc = crc32_no_comp(0, (uchar *)summary->sum,
			sumsize - sizeof(struct jffs2_raw_summary));

	if (summary->sum_crc != crc) {
		dbg_summary("Summary node data is corrupt (bad CRC)\n");
		goto crc_err;
	}

	if (summary->cln_mkr)
		dbg_summary("Summary : CLEANMARKER node \n");

	ret = jffs2_sum_process_sum_data(part, offset, summary, pL);
	if (ret == -EBADMSG)
		return 0;
	if (ret)
		return ret;		/* real error */

	return 1;

crc_err:
	putstr("Summary node crc error, skipping summary information.\n");

	return 0;
}
#endif /* CONFIG_JFFS2_SUMMARY */

#ifdef DEBUG_FRAGMENTS
static void
dump_fragments(struct b_lists *pL)
{
	struct b_node *b;
	struct jffs2_raw_inode ojNode;
	struct jffs2_raw_inode *jNode;

	putstr("\r\n\r\n******The fragment Entries******\r\n");
	b = pL->frag.listHead;
	while (b) {
		jNode = (struct jffs2_raw_inode *) get_fl_mem(b->offset,
			sizeof(ojNode), &ojNode);
		putLabeledWord("\r\n\tbuild_list: FLASH_OFFSET = ", b->offset);
		putLabeledWord("\tbuild_list: totlen = ", jNode->totlen);
		putLabeledWord("\tbuild_list: inode = ", jNode->ino);
		putLabeledWord("\tbuild_list: version = ", jNode->version);
		putLabeledWord("\tbuild_list: isize = ", jNode->isize);
		putLabeledWord("\tbuild_list: atime = ", jNode->atime);
		putLabeledWord("\tbuild_list: offset = ", jNode->offset);
		putLabeledWord("\tbuild_list: csize = ", jNode->csize);
		putLabeledWord("\tbuild_list: dsize = ", jNode->dsize);
		putLabeledWord("\tbuild_list: compr = ", jNode->compr);
		putLabeledWord("\tbuild_list: usercompr = ", jNode->usercompr);
		putLabeledWord("\tbuild_list: flags = ", jNode->flags);
		putLabeledWord("\tbuild_list: offset = ", b->offset);	/* FIXME: ? [RS] */
		b = b->next;
	}
}
#endif

#ifdef DEBUG_DIRENTS
static void
dump_dirents(struct b_lists *pL)
{
	struct b_node *b;
	struct jffs2_raw_dirent *jDir;

	putstr("\r\n\r\n******The directory Entries******\r\n");
	b = pL->dir.listHead;
	while (b) {
		jDir = (struct jffs2_raw_dirent *) get_node_mem(b->offset,
								pL->readbuf);
		putstr("\r\n");
		putnstr(jDir->name, jDir->nsize);
		putLabeledWord("\r\n\tbuild_list: magic = ", jDir->magic);
		putLabeledWord("\tbuild_list: nodetype = ", jDir->nodetype);
		putLabeledWord("\tbuild_list: hdr_crc = ", jDir->hdr_crc);
		putLabeledWord("\tbuild_list: pino = ", jDir->pino);
		putLabeledWord("\tbuild_list: version = ", jDir->version);
		putLabeledWord("\tbuild_list: ino = ", jDir->ino);
		putLabeledWord("\tbuild_list: mctime = ", jDir->mctime);
		putLabeledWord("\tbuild_list: nsize = ", jDir->nsize);
		putLabeledWord("\tbuild_list: type = ", jDir->type);
		putLabeledWord("\tbuild_list: node_crc = ", jDir->node_crc);
		putLabeledWord("\tbuild_list: name_crc = ", jDir->name_crc);
		putLabeledWord("\tbuild_list: offset = ", b->offset);	/* FIXME: ? [RS] */
		b = b->next;
		put_fl_mem(jDir, pL->readbuf);
	}
}
#endif

#define DEFAULT_EMPTY_SCAN_SIZE	4096

static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size)
{
	if (sector_size < DEFAULT_EMPTY_SCAN_SIZE)
		return sector_size;
	else
		return DEFAULT_EMPTY_SCAN_SIZE;
}

static u32
jffs2_1pass_build_lists(struct part_info * part)
{
	struct b_lists *pL;
	struct jffs2_unknown_node *node;
	u32 nr_sectors = part->size/part->sector_size;
	u32 i;
	u32 counter4 = 0;
	u32 counterF = 0;
	u32 counterN = 0;
	u32 max_totlen = 0;
	u32 buf_size = DEFAULT_EMPTY_SCAN_SIZE;
	char *buf;

	/* turn off the lcd.  Refreshing the lcd adds 50% overhead to the */
	/* jffs2 list building enterprise nope.  in newer versions the overhead is */
	/* only about 5 %.  not enough to inconvenience people for. */
	/* lcd_off(); */

	/* if we are building a list we need to refresh the cache. */
	jffs_init_1pass_list(part);
	pL = (struct b_lists *)part->jffs2_priv;
	buf = malloc(buf_size);
	puts ("Scanning JFFS2 FS:   ");

	/* start at the beginning of the partition */
	for (i = 0; i < nr_sectors; i++) {
		uint32_t sector_ofs = i * part->sector_size;
		uint32_t buf_ofs = sector_ofs;
		uint32_t buf_len;
		uint32_t ofs, prevofs;
#ifdef CONFIG_JFFS2_SUMMARY
		struct jffs2_sum_marker *sm;
		void *sumptr = NULL;
		uint32_t sumlen;
		int ret;
#endif

		WATCHDOG_RESET();

#ifdef CONFIG_JFFS2_SUMMARY
		buf_len = sizeof(*sm);

		/* Read as much as we want into the _end_ of the preallocated
		 * buffer
		 */
		get_fl_mem(part->offset + sector_ofs + part->sector_size -
				buf_len, buf_len, buf + buf_size - buf_len);

		sm = (void *)buf + buf_size - sizeof(*sm);
		if (sm->magic == JFFS2_SUM_MAGIC) {
			sumlen = part->sector_size - sm->offset;
			sumptr = buf + buf_size - sumlen;

			/* Now, make sure the summary itself is available */
			if (sumlen > buf_size) {
				/* Need to kmalloc for this. */
				sumptr = malloc(sumlen);
				if (!sumptr) {
					putstr("Can't get memory for summary "
							"node!\n");
					free(buf);
					jffs2_free_cache(part);
					return 0;
				}
				memcpy(sumptr + sumlen - buf_len, buf +
						buf_size - buf_len, buf_len);
			}
			if (buf_len < sumlen) {
				/* Need to read more so that the entire summary
				 * node is present
				 */
				get_fl_mem(part->offset + sector_ofs +
						part->sector_size - sumlen,
						sumlen - buf_len, sumptr);
			}
		}

		if (sumptr) {
			ret = jffs2_sum_scan_sumnode(part, sector_ofs, sumptr,
					sumlen, pL);

			if (buf_size && sumlen > buf_size)
				free(sumptr);
			if (ret < 0) {
				free(buf);
				jffs2_free_cache(part);
				return 0;
			}
			if (ret)
				continue;

		}
#endif /* CONFIG_JFFS2_SUMMARY */

		buf_len = EMPTY_SCAN_SIZE(part->sector_size);

		get_fl_mem((u32)part->offset + buf_ofs, buf_len, buf);

		/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
		ofs = 0;

		/* Scan only 4KiB of 0xFF before declaring it's empty */
		while (ofs < EMPTY_SCAN_SIZE(part->sector_size) &&
				*(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
			ofs += 4;

		if (ofs == EMPTY_SCAN_SIZE(part->sector_size))
			continue;

		ofs += sector_ofs;
		prevofs = ofs - 1;

	scan_more:
		while (ofs < sector_ofs + part->sector_size) {
			if (ofs == prevofs) {
				printf("offset %08x already seen, skip\n", ofs);
				ofs += 4;
				counter4++;
				continue;
			}
			prevofs = ofs;
			if (sector_ofs + part->sector_size <
					ofs + sizeof(*node))
				break;
			if (buf_ofs + buf_len < ofs + sizeof(*node)) {
				buf_len = min_t(uint32_t, buf_size, sector_ofs
						+ part->sector_size - ofs);
				get_fl_mem((u32)part->offset + ofs, buf_len,
					   buf);
				buf_ofs = ofs;
			}

			node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];

			if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
				uint32_t inbuf_ofs;
				uint32_t empty_start, scan_end;

				empty_start = ofs;
				ofs += 4;
				scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(
							part->sector_size)/8,
							buf_len);
			more_empty:
				inbuf_ofs = ofs - buf_ofs;
				while (inbuf_ofs < scan_end) {
					if (*(uint32_t *)(&buf[inbuf_ofs]) !=
							0xffffffff)
						goto scan_more;

					inbuf_ofs += 4;
					ofs += 4;
				}
				/* Ran off end. */

				/* See how much more there is to read in this
				 * eraseblock...
				 */
				buf_len = min_t(uint32_t, buf_size,
						sector_ofs +
						part->sector_size - ofs);
				if (!buf_len) {
					/* No more to read. Break out of main
					 * loop without marking this range of
					 * empty space as dirty (because it's
					 * not)
					 */
					break;
				}
				scan_end = buf_len;
				get_fl_mem((u32)part->offset + ofs, buf_len,
					   buf);
				buf_ofs = ofs;
				goto more_empty;
			}
			if (node->magic != JFFS2_MAGIC_BITMASK ||
					!hdr_crc(node)) {
				ofs += 4;
				counter4++;
				continue;
			}
			if (ofs + node->totlen >
					sector_ofs + part->sector_size) {
				ofs += 4;
				counter4++;
				continue;
			}
			/* if its a fragment add it */
			switch (node->nodetype) {
			case JFFS2_NODETYPE_INODE:
				if (buf_ofs + buf_len < ofs + sizeof(struct
							jffs2_raw_inode)) {
					get_fl_mem((u32)part->offset + ofs,
						   buf_len, buf);
					buf_ofs = ofs;
					node = (void *)buf;
				}
				if (!inode_crc((struct jffs2_raw_inode *) node))
				       break;

				if (insert_node(&pL->frag, (u32) part->offset +
						ofs) == NULL) {
					free(buf);
					jffs2_free_cache(part);
					return 0;
				}
				if (max_totlen < node->totlen)
					max_totlen = node->totlen;
				break;
			case JFFS2_NODETYPE_DIRENT:
				if (buf_ofs + buf_len < ofs + sizeof(struct
							jffs2_raw_dirent) +
							((struct
							 jffs2_raw_dirent *)
							node)->nsize) {
					get_fl_mem((u32)part->offset + ofs,
						   buf_len, buf);
					buf_ofs = ofs;
					node = (void *)buf;
				}

				if (!dirent_crc((struct jffs2_raw_dirent *)
							node) ||
						!dirent_name_crc(
							(struct
							 jffs2_raw_dirent *)
							node))
					break;
				if (! (counterN%100))
					puts ("\b\b.  ");
				if (insert_node(&pL->dir, (u32) part->offset +
						ofs) == NULL) {
					free(buf);
					jffs2_free_cache(part);
					return 0;
				}
				if (max_totlen < node->totlen)
					max_totlen = node->totlen;
				counterN++;
				break;
			case JFFS2_NODETYPE_CLEANMARKER:
				if (node->totlen != sizeof(struct jffs2_unknown_node))
					printf("OOPS Cleanmarker has bad size "
						"%d != %zu\n",
						node->totlen,
						sizeof(struct jffs2_unknown_node));
				break;
			case JFFS2_NODETYPE_PADDING:
				if (node->totlen < sizeof(struct jffs2_unknown_node))
					printf("OOPS Padding has bad size "
						"%d < %zu\n",
						node->totlen,
						sizeof(struct jffs2_unknown_node));
				break;
			case JFFS2_NODETYPE_SUMMARY:
				break;
			default:
				printf("Unknown node type: %x len %d offset 0x%x\n",
					node->nodetype,
					node->totlen, ofs);
			}
			ofs += ((node->totlen + 3) & ~3);
			counterF++;
		}
	}

	free(buf);
	putstr("\b\b done.\r\n");		/* close off the dots */

	/* We don't care if malloc failed - then each read operation will
	 * allocate its own buffer as necessary (NAND) or will read directly
	 * from flash (NOR).
	 */
	pL->readbuf = malloc(max_totlen);

	/* turn the lcd back on. */
	/* splash(); */

#if 0
	putLabeledWord("dir entries = ", pL->dir.listCount);
	putLabeledWord("frag entries = ", pL->frag.listCount);
	putLabeledWord("+4 increments = ", counter4);
	putLabeledWord("+file_offset increments = ", counterF);

#endif

#ifdef DEBUG_DIRENTS
	dump_dirents(pL);
#endif

#ifdef DEBUG_FRAGMENTS
	dump_fragments(pL);
#endif

	/* give visual feedback that we are done scanning the flash */
	led_blink(0x0, 0x0, 0x1, 0x1);	/* off, forever, on 100ms, off 100ms */
	return 1;
}


static u32
jffs2_1pass_fill_info(struct b_lists * pL, struct b_jffs2_info * piL)
{
	struct b_node *b;
	struct jffs2_raw_inode ojNode;
	struct jffs2_raw_inode *jNode;
	int i;

	for (i = 0; i < JFFS2_NUM_COMPR; i++) {
		piL->compr_info[i].num_frags = 0;
		piL->compr_info[i].compr_sum = 0;
		piL->compr_info[i].decompr_sum = 0;
	}

	b = pL->frag.listHead;
	while (b) {
		jNode = (struct jffs2_raw_inode *) get_fl_mem(b->offset,
			sizeof(ojNode), &ojNode);
		if (jNode->compr < JFFS2_NUM_COMPR) {
			piL->compr_info[jNode->compr].num_frags++;
			piL->compr_info[jNode->compr].compr_sum += jNode->csize;
			piL->compr_info[jNode->compr].decompr_sum += jNode->dsize;
		}
		b = b->next;
	}
	return 0;
}


static struct b_lists *
jffs2_get_list(struct part_info * part, const char *who)
{
	/* copy requested part_info struct pointer to global location */
	current_part = part;

	if (jffs2_1pass_rescan_needed(part)) {
		if (!jffs2_1pass_build_lists(part)) {
			printf("%s: Failed to scan JFFSv2 file structure\n", who);
			return NULL;
		}
	}
	return (struct b_lists *)part->jffs2_priv;
}


/* Print directory / file contents */
u32
jffs2_1pass_ls(struct part_info * part, const char *fname)
{
	struct b_lists *pl;
	long ret = 1;
	u32 inode;

	if (! (pl = jffs2_get_list(part, "ls")))
		return 0;

	if (! (inode = jffs2_1pass_search_list_inodes(pl, fname, 1))) {
		putstr("ls: Failed to scan jffs2 file structure\r\n");
		return 0;
	}


#if 0
	putLabeledWord("found file at inode = ", inode);
	putLabeledWord("read_inode returns = ", ret);
#endif

	return ret;
}


/* Load a file from flash into memory. fname can be a full path */
u32
jffs2_1pass_load(char *dest, struct part_info * part, const char *fname)
{

	struct b_lists *pl;
	long ret = 1;
	u32 inode;

	if (! (pl  = jffs2_get_list(part, "load")))
		return 0;

	if (! (inode = jffs2_1pass_search_inode(pl, fname, 1))) {
		putstr("load: Failed to find inode\r\n");
		return 0;
	}

	/* Resolve symlinks */
	if (! (inode = jffs2_1pass_resolve_inode(pl, inode))) {
		putstr("load: Failed to resolve inode structure\r\n");
		return 0;
	}

	if ((ret = jffs2_1pass_read_inode(pl, inode, dest)) < 0) {
		putstr("load: Failed to read inode\r\n");
		return 0;
	}

	DEBUGF ("load: loaded '%s' to 0x%lx (%ld bytes)\n", fname,
				(unsigned long) dest, ret);
	return ret;
}

/* Return information about the fs on this partition */
u32
jffs2_1pass_info(struct part_info * part)
{
	struct b_jffs2_info info;
	struct b_lists *pl;
	int i;

	if (! (pl  = jffs2_get_list(part, "info")))
		return 0;

	jffs2_1pass_fill_info(pl, &info);
	for (i = 0; i < JFFS2_NUM_COMPR; i++) {
		printf ("Compression: %s\n"
			"\tfrag count: %d\n"
			"\tcompressed sum: %d\n"
			"\tuncompressed sum: %d\n",
			compr_names[i],
			info.compr_info[i].num_frags,
			info.compr_info[i].compr_sum,
			info.compr_info[i].decompr_sum);
	}
	return 1;
}