summaryrefslogtreecommitdiffstats
path: root/fs/ubifs/lpt_commit.c
blob: b8a06079423927aba745678f360a101db11b67ab (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
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
/*
 * This file is part of UBIFS.
 *
 * Copyright (C) 2006-2008 Nokia Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * Authors: Adrian Hunter
 *          Artem Bityutskiy (Битюцкий Артём)
 */

/*
 * This file implements commit-related functionality of the LEB properties
 * subsystem.
 */

#include <linux/crc16.h>
#include "ubifs.h"

/**
 * first_dirty_cnode - find first dirty cnode.
 * @c: UBIFS file-system description object
 * @nnode: nnode at which to start
 *
 * This function returns the first dirty cnode or %NULL if there is not one.
 */
static struct ubifs_cnode *first_dirty_cnode(struct ubifs_nnode *nnode)
{
	ubifs_assert(nnode);
	while (1) {
		int i, cont = 0;

		for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
			struct ubifs_cnode *cnode;

			cnode = nnode->nbranch[i].cnode;
			if (cnode &&
			    test_bit(DIRTY_CNODE, &cnode->flags)) {
				if (cnode->level == 0)
					return cnode;
				nnode = (struct ubifs_nnode *)cnode;
				cont = 1;
				break;
			}
		}
		if (!cont)
			return (struct ubifs_cnode *)nnode;
	}
}

/**
 * next_dirty_cnode - find next dirty cnode.
 * @cnode: cnode from which to begin searching
 *
 * This function returns the next dirty cnode or %NULL if there is not one.
 */
static struct ubifs_cnode *next_dirty_cnode(struct ubifs_cnode *cnode)
{
	struct ubifs_nnode *nnode;
	int i;

	ubifs_assert(cnode);
	nnode = cnode->parent;
	if (!nnode)
		return NULL;
	for (i = cnode->iip + 1; i < UBIFS_LPT_FANOUT; i++) {
		cnode = nnode->nbranch[i].cnode;
		if (cnode && test_bit(DIRTY_CNODE, &cnode->flags)) {
			if (cnode->level == 0)
				return cnode; /* cnode is a pnode */
			/* cnode is a nnode */
			return first_dirty_cnode((struct ubifs_nnode *)cnode);
		}
	}
	return (struct ubifs_cnode *)nnode;
}

/**
 * get_cnodes_to_commit - create list of dirty cnodes to commit.
 * @c: UBIFS file-system description object
 *
 * This function returns the number of cnodes to commit.
 */
static int get_cnodes_to_commit(struct ubifs_info *c)
{
	struct ubifs_cnode *cnode, *cnext;
	int cnt = 0;

	if (!c->nroot)
		return 0;

	if (!test_bit(DIRTY_CNODE, &c->nroot->flags))
		return 0;

	c->lpt_cnext = first_dirty_cnode(c->nroot);
	cnode = c->lpt_cnext;
	if (!cnode)
		return 0;
	cnt += 1;
	while (1) {
		ubifs_assert(!test_bit(COW_ZNODE, &cnode->flags));
		__set_bit(COW_ZNODE, &cnode->flags);
		cnext = next_dirty_cnode(cnode);
		if (!cnext) {
			cnode->cnext = c->lpt_cnext;
			break;
		}
		cnode->cnext = cnext;
		cnode = cnext;
		cnt += 1;
	}
	dbg_cmt("committing %d cnodes", cnt);
	dbg_lp("committing %d cnodes", cnt);
	ubifs_assert(cnt == c->dirty_nn_cnt + c->dirty_pn_cnt);
	return cnt;
}

/**
 * upd_ltab - update LPT LEB properties.
 * @c: UBIFS file-system description object
 * @lnum: LEB number
 * @free: amount of free space
 * @dirty: amount of dirty space to add
 */
static void upd_ltab(struct ubifs_info *c, int lnum, int free, int dirty)
{
	dbg_lp("LEB %d free %d dirty %d to %d +%d",
	       lnum, c->ltab[lnum - c->lpt_first].free,
	       c->ltab[lnum - c->lpt_first].dirty, free, dirty);
	ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last);
	c->ltab[lnum - c->lpt_first].free = free;
	c->ltab[lnum - c->lpt_first].dirty += dirty;
}

/**
 * alloc_lpt_leb - allocate an LPT LEB that is empty.
 * @c: UBIFS file-system description object
 * @lnum: LEB number is passed and returned here
 *
 * This function finds the next empty LEB in the ltab starting from @lnum. If a
 * an empty LEB is found it is returned in @lnum and the function returns %0.
 * Otherwise the function returns -ENOSPC.  Note however, that LPT is designed
 * never to run out of space.
 */
static int alloc_lpt_leb(struct ubifs_info *c, int *lnum)
{
	int i, n;

	n = *lnum - c->lpt_first + 1;
	for (i = n; i < c->lpt_lebs; i++) {
		if (c->ltab[i].tgc || c->ltab[i].cmt)
			continue;
		if (c->ltab[i].free == c->leb_size) {
			c->ltab[i].cmt = 1;
			*lnum = i + c->lpt_first;
			return 0;
		}
	}

	for (i = 0; i < n; i++) {
		if (c->ltab[i].tgc || c->ltab[i].cmt)
			continue;
		if (c->ltab[i].free == c->leb_size) {
			c->ltab[i].cmt = 1;
			*lnum = i + c->lpt_first;
			return 0;
		}
	}
	return -ENOSPC;
}

/**
 * layout_cnodes - layout cnodes for commit.
 * @c: UBIFS file-system description object
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int layout_cnodes(struct ubifs_info *c)
{
	int lnum, offs, len, alen, done_lsave, done_ltab, err;
	struct ubifs_cnode *cnode;

	err = dbg_chk_lpt_sz(c, 0, 0);
	if (err)
		return err;
	cnode = c->lpt_cnext;
	if (!cnode)
		return 0;
	lnum = c->nhead_lnum;
	offs = c->nhead_offs;
	/* Try to place lsave and ltab nicely */
	done_lsave = !c->big_lpt;
	done_ltab = 0;
	if (!done_lsave && offs + c->lsave_sz <= c->leb_size) {
		done_lsave = 1;
		c->lsave_lnum = lnum;
		c->lsave_offs = offs;
		offs += c->lsave_sz;
		dbg_chk_lpt_sz(c, 1, c->lsave_sz);
	}

	if (offs + c->ltab_sz <= c->leb_size) {
		done_ltab = 1;
		c->ltab_lnum = lnum;
		c->ltab_offs = offs;
		offs += c->ltab_sz;
		dbg_chk_lpt_sz(c, 1, c->ltab_sz);
	}

	do {
		if (cnode->level) {
			len = c->nnode_sz;
			c->dirty_nn_cnt -= 1;
		} else {
			len = c->pnode_sz;
			c->dirty_pn_cnt -= 1;
		}
		while (offs + len > c->leb_size) {
			alen = ALIGN(offs, c->min_io_size);
			upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
			dbg_chk_lpt_sz(c, 2, alen - offs);
			err = alloc_lpt_leb(c, &lnum);
			if (err)
				goto no_space;
			offs = 0;
			ubifs_assert(lnum >= c->lpt_first &&
				     lnum <= c->lpt_last);
			/* Try to place lsave and ltab nicely */
			if (!done_lsave) {
				done_lsave = 1;
				c->lsave_lnum = lnum;
				c->lsave_offs = offs;
				offs += c->lsave_sz;
				dbg_chk_lpt_sz(c, 1, c->lsave_sz);
				continue;
			}
			if (!done_ltab) {
				done_ltab = 1;
				c->ltab_lnum = lnum;
				c->ltab_offs = offs;
				offs += c->ltab_sz;
				dbg_chk_lpt_sz(c, 1, c->ltab_sz);
				continue;
			}
			break;
		}
		if (cnode->parent) {
			cnode->parent->nbranch[cnode->iip].lnum = lnum;
			cnode->parent->nbranch[cnode->iip].offs = offs;
		} else {
			c->lpt_lnum = lnum;
			c->lpt_offs = offs;
		}
		offs += len;
		dbg_chk_lpt_sz(c, 1, len);
		cnode = cnode->cnext;
	} while (cnode && cnode != c->lpt_cnext);

	/* Make sure to place LPT's save table */
	if (!done_lsave) {
		if (offs + c->lsave_sz > c->leb_size) {
			alen = ALIGN(offs, c->min_io_size);
			upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
			dbg_chk_lpt_sz(c, 2, alen - offs);
			err = alloc_lpt_leb(c, &lnum);
			if (err)
				goto no_space;
			offs = 0;
			ubifs_assert(lnum >= c->lpt_first &&
				     lnum <= c->lpt_last);
		}
		done_lsave = 1;
		c->lsave_lnum = lnum;
		c->lsave_offs = offs;
		offs += c->lsave_sz;
		dbg_chk_lpt_sz(c, 1, c->lsave_sz);
	}

	/* Make sure to place LPT's own lprops table */
	if (!done_ltab) {
		if (offs + c->ltab_sz > c->leb_size) {
			alen = ALIGN(offs, c->min_io_size);
			upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
			dbg_chk_lpt_sz(c, 2, alen - offs);
			err = alloc_lpt_leb(c, &lnum);
			if (err)
				goto no_space;
			offs = 0;
			ubifs_assert(lnum >= c->lpt_first &&
				     lnum <= c->lpt_last);
		}
		done_ltab = 1;
		c->ltab_lnum = lnum;
		c->ltab_offs = offs;
		offs += c->ltab_sz;
		dbg_chk_lpt_sz(c, 1, c->ltab_sz);
	}

	alen = ALIGN(offs, c->min_io_size);
	upd_ltab(c, lnum, c->leb_size - alen, alen - offs);
	dbg_chk_lpt_sz(c, 4, alen - offs);
	err = dbg_chk_lpt_sz(c, 3, alen);
	if (err)
		return err;
	return 0;

no_space:
	ubifs_err("LPT out of space");
	dbg_err("LPT out of space at LEB %d:%d needing %d, done_ltab %d, "
		"done_lsave %d", lnum, offs, len, done_ltab, done_lsave);
	dbg_dump_lpt_info(c);
	dbg_dump_lpt_lebs(c);
	dump_stack();
	return err;
}

/**
 * realloc_lpt_leb - allocate an LPT LEB that is empty.
 * @c: UBIFS file-system description object
 * @lnum: LEB number is passed and returned here
 *
 * This function duplicates exactly the results of the function alloc_lpt_leb.
 * It is used during end commit to reallocate the same LEB numbers that were
 * allocated by alloc_lpt_leb during start commit.
 *
 * This function finds the next LEB that was allocated by the alloc_lpt_leb
 * function starting from @lnum. If a LEB is found it is returned in @lnum and
 * the function returns %0. Otherwise the function returns -ENOSPC.
 * Note however, that LPT is designed never to run out of space.
 */
static int realloc_lpt_leb(struct ubifs_info *c, int *lnum)
{
	int i, n;

	n = *lnum - c->lpt_first + 1;
	for (i = n; i < c->lpt_lebs; i++)
		if (c->ltab[i].cmt) {
			c->ltab[i].cmt = 0;
			*lnum = i + c->lpt_first;
			return 0;
		}

	for (i = 0; i < n; i++)
		if (c->ltab[i].cmt) {
			c->ltab[i].cmt = 0;
			*lnum = i + c->lpt_first;
			return 0;
		}
	return -ENOSPC;
}

/**
 * write_cnodes - write cnodes for commit.
 * @c: UBIFS file-system description object
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int write_cnodes(struct ubifs_info *c)
{
	int lnum, offs, len, from, err, wlen, alen, done_ltab, done_lsave;
	struct ubifs_cnode *cnode;
	void *buf = c->lpt_buf;

	cnode = c->lpt_cnext;
	if (!cnode)
		return 0;
	lnum = c->nhead_lnum;
	offs = c->nhead_offs;
	from = offs;
	/* Ensure empty LEB is unmapped */
	if (offs == 0) {
		err = ubifs_leb_unmap(c, lnum);
		if (err)
			return err;
	}
	/* Try to place lsave and ltab nicely */
	done_lsave = !c->big_lpt;
	done_ltab = 0;
	if (!done_lsave && offs + c->lsave_sz <= c->leb_size) {
		done_lsave = 1;
		ubifs_pack_lsave(c, buf + offs, c->lsave);
		offs += c->lsave_sz;
		dbg_chk_lpt_sz(c, 1, c->lsave_sz);
	}

	if (offs + c->ltab_sz <= c->leb_size) {
		done_ltab = 1;
		ubifs_pack_ltab(c, buf + offs, c->ltab_cmt);
		offs += c->ltab_sz;
		dbg_chk_lpt_sz(c, 1, c->ltab_sz);
	}

	/* Loop for each cnode */
	do {
		if (cnode->level)
			len = c->nnode_sz;
		else
			len = c->pnode_sz;
		while (offs + len > c->leb_size) {
			wlen = offs - from;
			if (wlen) {
				alen = ALIGN(wlen, c->min_io_size);
				memset(buf + offs, 0xff, alen - wlen);
				err = ubifs_leb_write(c, lnum, buf + from, from,
						       alen, UBI_SHORTTERM);
				if (err)
					return err;
				dbg_chk_lpt_sz(c, 4, alen - wlen);
			}
			dbg_chk_lpt_sz(c, 2, 0);
			err = realloc_lpt_leb(c, &lnum);
			if (err)
				goto no_space;
			offs = 0;
			from = 0;
			ubifs_assert(lnum >= c->lpt_first &&
				     lnum <= c->lpt_last);
			err = ubifs_leb_unmap(c, lnum);
			if (err)
				return err;
			/* Try to place lsave and ltab nicely */
			if (!done_lsave) {
				done_lsave = 1;
				ubifs_pack_lsave(c, buf + offs, c->lsave);
				offs += c->lsave_sz;
				dbg_chk_lpt_sz(c, 1, c->lsave_sz);
				continue;
			}
			if (!done_ltab) {
				done_ltab = 1;
				ubifs_pack_ltab(c, buf + offs, c->ltab_cmt);
				offs += c->ltab_sz;
				dbg_chk_lpt_sz(c, 1, c->ltab_sz);
				continue;
			}
			break;
		}
		if (cnode->level)
			ubifs_pack_nnode(c, buf + offs,
					 (struct ubifs_nnode *)cnode);
		else
			ubifs_pack_pnode(c, buf + offs,
					 (struct ubifs_pnode *)cnode);
		/*
		 * The reason for the barriers is the same as in case of TNC.
		 * See comment in 'write_index()'. 'dirty_cow_nnode()' and
		 * 'dirty_cow_pnode()' are the functions for which this is
		 * important.
		 */
		clear_bit(DIRTY_CNODE, &cnode->flags);
		smp_mb__before_clear_bit();
		clear_bit(COW_ZNODE, &cnode->flags);
		smp_mb__after_clear_bit();
		offs += len;
		dbg_chk_lpt_sz(c, 1, len);
		cnode = cnode->cnext;
	} while (cnode && cnode != c->lpt_cnext);

	/* Make sure to place LPT's save table */
	if (!done_lsave) {
		if (offs + c->lsave_sz > c->leb_size) {
			wlen = offs - from;
			alen = ALIGN(wlen, c->min_io_size);
			memset(buf + offs, 0xff, alen - wlen);
			err = ubifs_leb_write(c, lnum, buf + from, from, alen,
					      UBI_SHORTTERM);
			if (err)
				return err;
			dbg_chk_lpt_sz(c, 2, alen - wlen);
			err = realloc_lpt_leb(c, &lnum);
			if (err)
				goto no_space;
			offs = 0;
			ubifs_assert(lnum >= c->lpt_first &&
				     lnum <= c->lpt_last);
			err = ubifs_leb_unmap(c, lnum);
			if (err)
				return err;
		}
		done_lsave = 1;
		ubifs_pack_lsave(c, buf + offs, c->lsave);
		offs += c->lsave_sz;
		dbg_chk_lpt_sz(c, 1, c->lsave_sz);
	}

	/* Make sure to place LPT's own lprops table */
	if (!done_ltab) {
		if (offs + c->ltab_sz > c->leb_size) {
			wlen = offs - from;
			alen = ALIGN(wlen, c->min_io_size);
			memset(buf + offs, 0xff, alen - wlen);
			err = ubifs_leb_write(c, lnum, buf + from, from, alen,
					      UBI_SHORTTERM);
			if (err)
				return err;
			dbg_chk_lpt_sz(c, 2, alen - wlen);
			err = realloc_lpt_leb(c, &lnum);
			if (err)
				goto no_space;
			offs = 0;
			ubifs_assert(lnum >= c->lpt_first &&
				     lnum <= c->lpt_last);
			err = ubifs_leb_unmap(c, lnum);
			if (err)
				return err;
		}
		done_ltab = 1;
		ubifs_pack_ltab(c, buf + offs, c->ltab_cmt);
		offs += c->ltab_sz;
		dbg_chk_lpt_sz(c, 1, c->ltab_sz);
	}

	/* Write remaining data in buffer */
	wlen = offs - from;
	alen = ALIGN(wlen, c->min_io_size);
	memset(buf + offs, 0xff, alen - wlen);
	err = ubifs_leb_write(c, lnum, buf + from, from, alen, UBI_SHORTTERM);
	if (err)
		return err;

	dbg_chk_lpt_sz(c, 4, alen - wlen);
	err = dbg_chk_lpt_sz(c, 3, ALIGN(offs, c->min_io_size));
	if (err)
		return err;

	c->nhead_lnum = lnum;
	c->nhead_offs = ALIGN(offs, c->min_io_size);

	dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs);
	dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs);
	dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs);
	if (c->big_lpt)
		dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs);

	return 0;

no_space:
	ubifs_err("LPT out of space mismatch");
	dbg_err("LPT out of space mismatch at LEB %d:%d needing %d, done_ltab "
		"%d, done_lsave %d", lnum, offs, len, done_ltab, done_lsave);
	dbg_dump_lpt_info(c);
	dbg_dump_lpt_lebs(c);
	dump_stack();
	return err;
}

/**
 * next_pnode - find next pnode.
 * @c: UBIFS file-system description object
 * @pnode: pnode
 *
 * This function returns the next pnode or %NULL if there are no more pnodes.
 */
static struct ubifs_pnode *next_pnode(struct ubifs_info *c,
				      struct ubifs_pnode *pnode)
{
	struct ubifs_nnode *nnode;
	int iip;

	/* Try to go right */
	nnode = pnode->parent;
	iip = pnode->iip + 1;
	if (iip < UBIFS_LPT_FANOUT) {
		/* We assume here that LEB zero is never an LPT LEB */
		if (nnode->nbranch[iip].lnum)
			return ubifs_get_pnode(c, nnode, iip);
	}

	/* Go up while can't go right */
	do {
		iip = nnode->iip + 1;
		nnode = nnode->parent;
		if (!nnode)
			return NULL;
		/* We assume here that LEB zero is never an LPT LEB */
	} while (iip >= UBIFS_LPT_FANOUT || !nnode->nbranch[iip].lnum);

	/* Go right */
	nnode = ubifs_get_nnode(c, nnode, iip);
	if (IS_ERR(nnode))
		return (void *)nnode;

	/* Go down to level 1 */
	while (nnode->level > 1) {
		nnode = ubifs_get_nnode(c, nnode, 0);
		if (IS_ERR(nnode))
			return (void *)nnode;
	}

	return ubifs_get_pnode(c, nnode, 0);
}

/**
 * pnode_lookup - lookup a pnode in the LPT.
 * @c: UBIFS file-system description object
 * @i: pnode number (0 to main_lebs - 1)
 *
 * This function returns a pointer to the pnode on success or a negative
 * error code on failure.
 */
static struct ubifs_pnode *pnode_lookup(struct ubifs_info *c, int i)
{
	int err, h, iip, shft;
	struct ubifs_nnode *nnode;

	if (!c->nroot) {
		err = ubifs_read_nnode(c, NULL, 0);
		if (err)
			return ERR_PTR(err);
	}
	i <<= UBIFS_LPT_FANOUT_SHIFT;
	nnode = c->nroot;
	shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT;
	for (h = 1; h < c->lpt_hght; h++) {
		iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
		shft -= UBIFS_LPT_FANOUT_SHIFT;
		nnode = ubifs_get_nnode(c, nnode, iip);
		if (IS_ERR(nnode))
			return ERR_PTR(PTR_ERR(nnode));
	}
	iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
	return ubifs_get_pnode(c, nnode, iip);
}

/**
 * add_pnode_dirt - add dirty space to LPT LEB properties.
 * @c: UBIFS file-system description object
 * @pnode: pnode for which to add dirt
 */
static void add_pnode_dirt(struct ubifs_info *c, struct ubifs_pnode *pnode)
{
	ubifs_add_lpt_dirt(c, pnode->parent->nbranch[pnode->iip].lnum,
			   c->pnode_sz);
}

/**
 * do_make_pnode_dirty - mark a pnode dirty.
 * @c: UBIFS file-system description object
 * @pnode: pnode to mark dirty
 */
static void do_make_pnode_dirty(struct ubifs_info *c, struct ubifs_pnode *pnode)
{
	/* Assumes cnext list is empty i.e. not called during commit */
	if (!test_and_set_bit(DIRTY_CNODE, &pnode->flags)) {
		struct ubifs_nnode *nnode;

		c->dirty_pn_cnt += 1;
		add_pnode_dirt(c, pnode);
		/* Mark parent and ancestors dirty too */
		nnode = pnode->parent;
		while (nnode) {
			if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) {
				c->dirty_nn_cnt += 1;
				ubifs_add_nnode_dirt(c, nnode);
				nnode = nnode->parent;
			} else
				break;
		}
	}
}

/**
 * make_tree_dirty - mark the entire LEB properties tree dirty.
 * @c: UBIFS file-system description object
 *
 * This function is used by the "small" LPT model to cause the entire LEB
 * properties tree to be written.  The "small" LPT model does not use LPT
 * garbage collection because it is more efficient to write the entire tree
 * (because it is small).
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int make_tree_dirty(struct ubifs_info *c)
{
	struct ubifs_pnode *pnode;

	pnode = pnode_lookup(c, 0);
	while (pnode) {
		do_make_pnode_dirty(c, pnode);
		pnode = next_pnode(c, pnode);
		if (IS_ERR(pnode))
			return PTR_ERR(pnode);
	}
	return 0;
}

/**
 * need_write_all - determine if the LPT area is running out of free space.
 * @c: UBIFS file-system description object
 *
 * This function returns %1 if the LPT area is running out of free space and %0
 * if it is not.
 */
static int need_write_all(struct ubifs_info *c)
{
	long long free = 0;
	int i;

	for (i = 0; i < c->lpt_lebs; i++) {
		if (i + c->lpt_first == c->nhead_lnum)
			free += c->leb_size - c->nhead_offs;
		else if (c->ltab[i].free == c->leb_size)
			free += c->leb_size;
		else if (c->ltab[i].free + c->ltab[i].dirty == c->leb_size)
			free += c->leb_size;
	}
	/* Less than twice the size left */
	if (free <= c->lpt_sz * 2)
		return 1;
	return 0;
}

/**
 * lpt_tgc_start - start trivial garbage collection of LPT LEBs.
 * @c: UBIFS file-system description object
 *
 * LPT trivial garbage collection is where a LPT LEB contains only dirty and
 * free space and so may be reused as soon as the next commit is completed.
 * This function is called during start commit to mark LPT LEBs for trivial GC.
 */
static void lpt_tgc_start(struct ubifs_info *c)
{
	int i;

	for (i = 0; i < c->lpt_lebs; i++) {
		if (i + c->lpt_first == c->nhead_lnum)
			continue;
		if (c->ltab[i].dirty > 0 &&
		    c->ltab[i].free + c->ltab[i].dirty == c->leb_size) {
			c->ltab[i].tgc = 1;
			c->ltab[i].free = c->leb_size;
			c->ltab[i].dirty = 0;
			dbg_lp("LEB %d", i + c->lpt_first);
		}
	}
}

/**
 * lpt_tgc_end - end trivial garbage collection of LPT LEBs.
 * @c: UBIFS file-system description object
 *
 * LPT trivial garbage collection is where a LPT LEB contains only dirty and
 * free space and so may be reused as soon as the next commit is completed.
 * This function is called after the commit is completed (master node has been
 * written) and unmaps LPT LEBs that were marked for trivial GC.
 */
static int lpt_tgc_end(struct ubifs_info *c)
{
	int i, err;

	for (i = 0; i < c->lpt_lebs; i++)
		if (c->ltab[i].tgc) {
			err = ubifs_leb_unmap(c, i + c->lpt_first);
			if (err)
				return err;
			c->ltab[i].tgc = 0;
			dbg_lp("LEB %d", i + c->lpt_first);
		}
	return 0;
}

/**
 * populate_lsave - fill the lsave array with important LEB numbers.
 * @c: the UBIFS file-system description object
 *
 * This function is only called for the "big" model. It records a small number
 * of LEB numbers of important LEBs.  Important LEBs are ones that are (from
 * most important to least important): empty, freeable, freeable index, dirty
 * index, dirty or free. Upon mount, we read this list of LEB numbers and bring
 * their pnodes into memory.  That will stop us from having to scan the LPT
 * straight away. For the "small" model we assume that scanning the LPT is no
 * big deal.
 */
static void populate_lsave(struct ubifs_info *c)
{
	struct ubifs_lprops *lprops;
	struct ubifs_lpt_heap *heap;
	int i, cnt = 0;

	ubifs_assert(c->big_lpt);
	if (!(c->lpt_drty_flgs & LSAVE_DIRTY)) {
		c->lpt_drty_flgs |= LSAVE_DIRTY;
		ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz);
	}
	list_for_each_entry(lprops, &c->empty_list, list) {
		c->lsave[cnt++] = lprops->lnum;
		if (cnt >= c->lsave_cnt)
			return;
	}
	list_for_each_entry(lprops, &c->freeable_list, list) {
		c->lsave[cnt++] = lprops->lnum;
		if (cnt >= c->lsave_cnt)
			return;
	}
	list_for_each_entry(lprops, &c->frdi_idx_list, list) {
		c->lsave[cnt++] = lprops->lnum;
		if (cnt >= c->lsave_cnt)
			return;
	}
	heap = &c->lpt_heap[LPROPS_DIRTY_IDX - 1];
	for (i = 0; i < heap->cnt; i++) {
		c->lsave[cnt++] = heap->arr[i]->lnum;
		if (cnt >= c->lsave_cnt)
			return;
	}
	heap = &c->lpt_heap[LPROPS_DIRTY - 1];
	for (i = 0; i < heap->cnt; i++) {
		c->lsave[cnt++] = heap->arr[i]->lnum;
		if (cnt >= c->lsave_cnt)
			return;
	}
	heap = &c->lpt_heap[LPROPS_FREE - 1];
	for (i = 0; i < heap->cnt; i++) {
		c->lsave[cnt++] = heap->arr[i]->lnum;
		if (cnt >= c->lsave_cnt)
			return;
	}
	/* Fill it up completely */
	while (cnt < c->lsave_cnt)
		c->lsave[cnt++] = c->main_first;
}

/**
 * nnode_lookup - lookup a nnode in the LPT.
 * @c: UBIFS file-system description object
 * @i: nnode number
 *
 * This function returns a pointer to the nnode on success or a negative
 * error code on failure.
 */
static struct ubifs_nnode *nnode_lookup(struct ubifs_info *c, int i)
{
	int err, iip;
	struct ubifs_nnode *nnode;

	if (!c->nroot) {
		err = ubifs_read_nnode(c, NULL, 0);
		if (err)
			return ERR_PTR(err);
	}
	nnode = c->nroot;
	while (1) {
		iip = i & (UBIFS_LPT_FANOUT - 1);
		i >>= UBIFS_LPT_FANOUT_SHIFT;
		if (!i)
			break;
		nnode = ubifs_get_nnode(c, nnode, iip);
		if (IS_ERR(nnode))
			return nnode;
	}
	return nnode;
}

/**
 * make_nnode_dirty - find a nnode and, if found, make it dirty.
 * @c: UBIFS file-system description object
 * @node_num: nnode number of nnode to make dirty
 * @lnum: LEB number where nnode was written
 * @offs: offset where nnode was written
 *
 * This function is used by LPT garbage collection.  LPT garbage collection is
 * used only for the "big" LPT model (c->big_lpt == 1).  Garbage collection
 * simply involves marking all the nodes in the LEB being garbage-collected as
 * dirty.  The dirty nodes are written next commit, after which the LEB is free
 * to be reused.
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int make_nnode_dirty(struct ubifs_info *c, int node_num, int lnum,
			    int offs)
{
	struct ubifs_nnode *nnode;

	nnode = nnode_lookup(c, node_num);
	if (IS_ERR(nnode))
		return PTR_ERR(nnode);
	if (nnode->parent) {
		struct ubifs_nbranch *branch;

		branch = &nnode->parent->nbranch[nnode->iip];
		if (branch->lnum != lnum || branch->offs != offs)
			return 0; /* nnode is obsolete */
	} else if (c->lpt_lnum != lnum || c->lpt_offs != offs)
			return 0; /* nnode is obsolete */
	/* Assumes cnext list is empty i.e. not called during commit */
	if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) {
		c->dirty_nn_cnt += 1;
		ubifs_add_nnode_dirt(c, nnode);
		/* Mark parent and ancestors dirty too */
		nnode = nnode->parent;
		while (nnode) {
			if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) {
				c->dirty_nn_cnt += 1;
				ubifs_add_nnode_dirt(c, nnode);
				nnode = nnode->parent;
			} else
				break;
		}
	}
	return 0;
}

/**
 * make_pnode_dirty - find a pnode and, if found, make it dirty.
 * @c: UBIFS file-system description object
 * @node_num: pnode number of pnode to make dirty
 * @lnum: LEB number where pnode was written
 * @offs: offset where pnode was written
 *
 * This function is used by LPT garbage collection.  LPT garbage collection is
 * used only for the "big" LPT model (c->big_lpt == 1).  Garbage collection
 * simply involves marking all the nodes in the LEB being garbage-collected as
 * dirty.  The dirty nodes are written next commit, after which the LEB is free
 * to be reused.
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int make_pnode_dirty(struct ubifs_info *c, int node_num, int lnum,
			    int offs)
{
	struct ubifs_pnode *pnode;
	struct ubifs_nbranch *branch;

	pnode = pnode_lookup(c, node_num);
	if (IS_ERR(pnode))
		return PTR_ERR(pnode);
	branch = &pnode->parent->nbranch[pnode->iip];
	if (branch->lnum != lnum || branch->offs != offs)
		return 0;
	do_make_pnode_dirty(c, pnode);
	return 0;
}

/**
 * make_ltab_dirty - make ltab node dirty.
 * @c: UBIFS file-system description object
 * @lnum: LEB number where ltab was written
 * @offs: offset where ltab was written
 *
 * This function is used by LPT garbage collection.  LPT garbage collection is
 * used only for the "big" LPT model (c->big_lpt == 1).  Garbage collection
 * simply involves marking all the nodes in the LEB being garbage-collected as
 * dirty.  The dirty nodes are written next commit, after which the LEB is free
 * to be reused.
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int make_ltab_dirty(struct ubifs_info *c, int lnum, int offs)
{
	if (lnum != c->ltab_lnum || offs != c->ltab_offs)
		return 0; /* This ltab node is obsolete */
	if (!(c->lpt_drty_flgs & LTAB_DIRTY)) {
		c->lpt_drty_flgs |= LTAB_DIRTY;
		ubifs_add_lpt_dirt(c, c->ltab_lnum, c->ltab_sz);
	}
	return 0;
}

/**
 * make_lsave_dirty - make lsave node dirty.
 * @c: UBIFS file-system description object
 * @lnum: LEB number where lsave was written
 * @offs: offset where lsave was written
 *
 * This function is used by LPT garbage collection.  LPT garbage collection is
 * used only for the "big" LPT model (c->big_lpt == 1).  Garbage collection
 * simply involves marking all the nodes in the LEB being garbage-collected as
 * dirty.  The dirty nodes are written next commit, after which the LEB is free
 * to be reused.
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int make_lsave_dirty(struct ubifs_info *c, int lnum, int offs)
{
	if (lnum != c->lsave_lnum || offs != c->lsave_offs)
		return 0; /* This lsave node is obsolete */
	if (!(c->lpt_drty_flgs & LSAVE_DIRTY)) {
		c->lpt_drty_flgs |= LSAVE_DIRTY;
		ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz);
	}
	return 0;
}

/**
 * make_node_dirty - make node dirty.
 * @c: UBIFS file-system description object
 * @node_type: LPT node type
 * @node_num: node number
 * @lnum: LEB number where node was written
 * @offs: offset where node was written
 *
 * This function is used by LPT garbage collection.  LPT garbage collection is
 * used only for the "big" LPT model (c->big_lpt == 1).  Garbage collection
 * simply involves marking all the nodes in the LEB being garbage-collected as
 * dirty.  The dirty nodes are written next commit, after which the LEB is free
 * to be reused.
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int make_node_dirty(struct ubifs_info *c, int node_type, int node_num,
			   int lnum, int offs)
{
	switch (node_type) {
	case UBIFS_LPT_NNODE:
		return make_nnode_dirty(c, node_num, lnum, offs);
	case UBIFS_LPT_PNODE:
		return make_pnode_dirty(c, node_num, lnum, offs);
	case UBIFS_LPT_LTAB:
		return make_ltab_dirty(c, lnum, offs);
	case UBIFS_LPT_LSAVE:
		return make_lsave_dirty(c, lnum, offs);
	}
	return -EINVAL;
}

/**
 * get_lpt_node_len - return the length of a node based on its type.
 * @c: UBIFS file-system description object
 * @node_type: LPT node type
 */
static int get_lpt_node_len(const struct ubifs_info *c, int node_type)
{
	switch (node_type) {
	case UBIFS_LPT_NNODE:
		return c->nnode_sz;
	case UBIFS_LPT_PNODE:
		return c->pnode_sz;
	case UBIFS_LPT_LTAB:
		return c->ltab_sz;
	case UBIFS_LPT_LSAVE:
		return c->lsave_sz;
	}
	return 0;
}

/**
 * get_pad_len - return the length of padding in a buffer.
 * @c: UBIFS file-system description object
 * @buf: buffer
 * @len: length of buffer
 */
static int get_pad_len(const struct ubifs_info *c, uint8_t *buf, int len)
{
	int offs, pad_len;

	if (c->min_io_size == 1)
		return 0;
	offs = c->leb_size - len;
	pad_len = ALIGN(offs, c->min_io_size) - offs;
	return pad_len;
}

/**
 * get_lpt_node_type - return type (and node number) of a node in a buffer.
 * @c: UBIFS file-system description object
 * @buf: buffer
 * @node_num: node number is returned here
 */
static int get_lpt_node_type(const struct ubifs_info *c, uint8_t *buf,
			     int *node_num)
{
	uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
	int pos = 0, node_type;

	node_type = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_TYPE_BITS);
	*node_num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits);
	return node_type;
}

/**
 * is_a_node - determine if a buffer contains a node.
 * @c: UBIFS file-system description object
 * @buf: buffer
 * @len: length of buffer
 *
 * This function returns %1 if the buffer contains a node or %0 if it does not.
 */
static int is_a_node(const struct ubifs_info *c, uint8_t *buf, int len)
{
	uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
	int pos = 0, node_type, node_len;
	uint16_t crc, calc_crc;

	if (len < UBIFS_LPT_CRC_BYTES + (UBIFS_LPT_TYPE_BITS + 7) / 8)
		return 0;
	node_type = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_TYPE_BITS);
	if (node_type == UBIFS_LPT_NOT_A_NODE)
		return 0;
	node_len = get_lpt_node_len(c, node_type);
	if (!node_len || node_len > len)
		return 0;
	pos = 0;
	addr = buf;
	crc = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_CRC_BITS);
	calc_crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
			 node_len - UBIFS_LPT_CRC_BYTES);
	if (crc != calc_crc)
		return 0;
	return 1;
}

/**
 * lpt_gc_lnum - garbage collect a LPT LEB.
 * @c: UBIFS file-system description object
 * @lnum: LEB number to garbage collect
 *
 * LPT garbage collection is used only for the "big" LPT model
 * (c->big_lpt == 1).  Garbage collection simply involves marking all the nodes
 * in the LEB being garbage-collected as dirty.  The dirty nodes are written
 * next commit, after which the LEB is free to be reused.
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int lpt_gc_lnum(struct ubifs_info *c, int lnum)
{
	int err, len = c->leb_size, node_type, node_num, node_len, offs;
	void *buf = c->lpt_buf;

	dbg_lp("LEB %d", lnum);
	err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
	if (err) {
		ubifs_err("cannot read LEB %d, error %d", lnum, err);
		return err;
	}
	while (1) {
		if (!is_a_node(c, buf, len)) {
			int pad_len;

			pad_len = get_pad_len(c, buf, len);
			if (pad_len) {
				buf += pad_len;
				len -= pad_len;
				continue;
			}
			return 0;
		}
		node_type = get_lpt_node_type(c, buf, &node_num);
		node_len = get_lpt_node_len(c, node_type);
		offs = c->leb_size - len;
		ubifs_assert(node_len != 0);
		mutex_lock(&c->lp_mutex);
		err = make_node_dirty(c, node_type, node_num, lnum, offs);
		mutex_unlock(&c->lp_mutex);
		if (err)
			return err;
		buf += node_len;
		len -= node_len;
	}
	return 0;
}

/**
 * lpt_gc - LPT garbage collection.
 * @c: UBIFS file-system description object
 *
 * Select a LPT LEB for LPT garbage collection and call 'lpt_gc_lnum()'.
 * Returns %0 on success and a negative error code on failure.
 */
static int lpt_gc(struct ubifs_info *c)
{
	int i, lnum = -1, dirty = 0;

	mutex_lock(&c->lp_mutex);
	for (i = 0; i < c->lpt_lebs; i++) {
		ubifs_assert(!c->ltab[i].tgc);
		if (i + c->lpt_first == c->nhead_lnum ||
		    c->ltab[i].free + c->ltab[i].dirty == c->leb_size)
			continue;
		if (c->ltab[i].dirty > dirty) {
			dirty = c->ltab[i].dirty;
			lnum = i + c->lpt_first;
		}
	}
	mutex_unlock(&c->lp_mutex);
	if (lnum == -1)
		return -ENOSPC;
	return lpt_gc_lnum(c, lnum);
}

/**
 * ubifs_lpt_start_commit - UBIFS commit starts.
 * @c: the UBIFS file-system description object
 *
 * This function has to be called when UBIFS starts the commit operation.
 * This function "freezes" all currently dirty LEB properties and does not
 * change them anymore. Further changes are saved and tracked separately
 * because they are not part of this commit. This function returns zero in case
 * of success and a negative error code in case of failure.
 */
int ubifs_lpt_start_commit(struct ubifs_info *c)
{
	int err, cnt;

	dbg_lp("");

	mutex_lock(&c->lp_mutex);
	err = dbg_chk_lpt_free_spc(c);
	if (err)
		goto out;
	err = dbg_check_ltab(c);
	if (err)
		goto out;

	if (c->check_lpt_free) {
		/*
		 * We ensure there is enough free space in
		 * ubifs_lpt_post_commit() by marking nodes dirty. That
		 * information is lost when we unmount, so we also need
		 * to check free space once after mounting also.
		 */
		c->check_lpt_free = 0;
		while (need_write_all(c)) {
			mutex_unlock(&c->lp_mutex);
			err = lpt_gc(c);
			if (err)
				return err;
			mutex_lock(&c->lp_mutex);
		}
	}

	lpt_tgc_start(c);

	if (!c->dirty_pn_cnt) {
		dbg_cmt("no cnodes to commit");
		err = 0;
		goto out;
	}

	if (!c->big_lpt && need_write_all(c)) {
		/* If needed, write everything */
		err = make_tree_dirty(c);
		if (err)
			goto out;
		lpt_tgc_start(c);
	}

	if (c->big_lpt)
		populate_lsave(c);

	cnt = get_cnodes_to_commit(c);
	ubifs_assert(cnt != 0);

	err = layout_cnodes(c);
	if (err)
		goto out;

	/* Copy the LPT's own lprops for end commit to write */
	memcpy(c->ltab_cmt, c->ltab,
	       sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs);
	c->lpt_drty_flgs &= ~(LTAB_DIRTY | LSAVE_DIRTY);

out:
	mutex_unlock(&c->lp_mutex);
	return err;
}

/**
 * free_obsolete_cnodes - free obsolete cnodes for commit end.
 * @c: UBIFS file-system description object
 */
static void free_obsolete_cnodes(struct ubifs_info *c)
{
	struct ubifs_cnode *cnode, *cnext;

	cnext = c->lpt_cnext;
	if (!cnext)
		return;
	do {
		cnode = cnext;
		cnext = cnode->cnext;
		if (test_bit(OBSOLETE_CNODE, &cnode->flags))
			kfree(cnode);
		else
			cnode->cnext = NULL;
	} while (cnext != c->lpt_cnext);
	c->lpt_cnext = NULL;
}

/**
 * ubifs_lpt_end_commit - finish the commit operation.
 * @c: the UBIFS file-system description object
 *
 * This function has to be called when the commit operation finishes. It
 * flushes the changes which were "frozen" by 'ubifs_lprops_start_commit()' to
 * the media. Returns zero in case of success and a negative error code in case
 * of failure.
 */
int ubifs_lpt_end_commit(struct ubifs_info *c)
{
	int err;

	dbg_lp("");

	if (!c->lpt_cnext)
		return 0;

	err = write_cnodes(c);
	if (err)
		return err;

	mutex_lock(&c->lp_mutex);
	free_obsolete_cnodes(c);
	mutex_unlock(&c->lp_mutex);

	return 0;
}

/**
 * ubifs_lpt_post_commit - post commit LPT trivial GC and LPT GC.
 * @c: UBIFS file-system description object
 *
 * LPT trivial GC is completed after a commit. Also LPT GC is done after a
 * commit for the "big" LPT model.
 */
int ubifs_lpt_post_commit(struct ubifs_info *c)
{
	int err;

	mutex_lock(&c->lp_mutex);
	err = lpt_tgc_end(c);
	if (err)
		goto out;
	if (c->big_lpt)
		while (need_write_all(c)) {
			mutex_unlock(&c->lp_mutex);
			err = lpt_gc(c);
			if (err)
				return err;
			mutex_lock(&c->lp_mutex);
		}
out:
	mutex_unlock(&c->lp_mutex);
	return err;
}

/**
 * first_nnode - find the first nnode in memory.
 * @c: UBIFS file-system description object
 * @hght: height of tree where nnode found is returned here
 *
 * This function returns a pointer to the nnode found or %NULL if no nnode is
 * found. This function is a helper to 'ubifs_lpt_free()'.
 */
static struct ubifs_nnode *first_nnode(struct ubifs_info *c, int *hght)
{
	struct ubifs_nnode *nnode;
	int h, i, found;

	nnode = c->nroot;
	*hght = 0;
	if (!nnode)
		return NULL;
	for (h = 1; h < c->lpt_hght; h++) {
		found = 0;
		for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
			if (nnode->nbranch[i].nnode) {
				found = 1;
				nnode = nnode->nbranch[i].nnode;
				*hght = h;
				break;
			}
		}
		if (!found)
			break;
	}
	return nnode;
}

/**
 * next_nnode - find the next nnode in memory.
 * @c: UBIFS file-system description object
 * @nnode: nnode from which to start.
 * @hght: height of tree where nnode is, is passed and returned here
 *
 * This function returns a pointer to the nnode found or %NULL if no nnode is
 * found. This function is a helper to 'ubifs_lpt_free()'.
 */
static struct ubifs_nnode *next_nnode(struct ubifs_info *c,
				      struct ubifs_nnode *nnode, int *hght)
{
	struct ubifs_nnode *parent;
	int iip, h, i, found;

	parent = nnode->parent;
	if (!parent)
		return NULL;
	if (nnode->iip == UBIFS_LPT_FANOUT - 1) {
		*hght -= 1;
		return parent;
	}
	for (iip = nnode->iip + 1; iip < UBIFS_LPT_FANOUT; iip++) {
		nnode = parent->nbranch[iip].nnode;
		if (nnode)
			break;
	}
	if (!nnode) {
		*hght -= 1;
		return parent;
	}
	for (h = *hght + 1; h < c->lpt_hght; h++) {
		found = 0;
		for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
			if (nnode->nbranch[i].nnode) {
				found = 1;
				nnode = nnode->nbranch[i].nnode;
				*hght = h;
				break;
			}
		}
		if (!found)
			break;
	}
	return nnode;
}

/**
 * ubifs_lpt_free - free resources owned by the LPT.
 * @c: UBIFS file-system description object
 * @wr_only: free only resources used for writing
 */
void ubifs_lpt_free(struct ubifs_info *c, int wr_only)
{
	struct ubifs_nnode *nnode;
	int i, hght;

	/* Free write-only things first */

	free_obsolete_cnodes(c); /* Leftover from a failed commit */

	vfree(c->ltab_cmt);
	c->ltab_cmt = NULL;
	vfree(c->lpt_buf);
	c->lpt_buf = NULL;
	kfree(c->lsave);
	c->lsave = NULL;

	if (wr_only)
		return;

	/* Now free the rest */

	nnode = first_nnode(c, &hght);
	while (nnode) {
		for (i = 0; i < UBIFS_LPT_FANOUT; i++)
			kfree(nnode->nbranch[i].nnode);
		nnode = next_nnode(c, nnode, &hght);
	}
	for (i = 0; i < LPROPS_HEAP_CNT; i++)
		kfree(c->lpt_heap[i].arr);
	kfree(c->dirty_idx.arr);
	kfree(c->nroot);
	vfree(c->ltab);
	kfree(c->lpt_nod_buf);
}

#ifdef CONFIG_UBIFS_FS_DEBUG

/**
 * dbg_is_all_ff - determine if a buffer contains only 0xff bytes.
 * @buf: buffer
 * @len: buffer length
 */
static int dbg_is_all_ff(uint8_t *buf, int len)
{
	int i;

	for (i = 0; i < len; i++)
		if (buf[i] != 0xff)
			return 0;
	return 1;
}

/**
 * dbg_is_nnode_dirty - determine if a nnode is dirty.
 * @c: the UBIFS file-system description object
 * @lnum: LEB number where nnode was written
 * @offs: offset where nnode was written
 */
static int dbg_is_nnode_dirty(struct ubifs_info *c, int lnum, int offs)
{
	struct ubifs_nnode *nnode;
	int hght;

	/* Entire tree is in memory so first_nnode / next_nnode are ok */
	nnode = first_nnode(c, &hght);
	for (; nnode; nnode = next_nnode(c, nnode, &hght)) {
		struct ubifs_nbranch *branch;

		cond_resched();
		if (nnode->parent) {
			branch = &nnode->parent->nbranch[nnode->iip];
			if (branch->lnum != lnum || branch->offs != offs)
				continue;
			if (test_bit(DIRTY_CNODE, &nnode->flags))
				return 1;
			return 0;
		} else {
			if (c->lpt_lnum != lnum || c->lpt_offs != offs)
				continue;
			if (test_bit(DIRTY_CNODE, &nnode->flags))
				return 1;
			return 0;
		}
	}
	return 1;
}

/**
 * dbg_is_pnode_dirty - determine if a pnode is dirty.
 * @c: the UBIFS file-system description object
 * @lnum: LEB number where pnode was written
 * @offs: offset where pnode was written
 */
static int dbg_is_pnode_dirty(struct ubifs_info *c, int lnum, int offs)
{
	int i, cnt;

	cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT);
	for (i = 0; i < cnt; i++) {
		struct ubifs_pnode *pnode;
		struct ubifs_nbranch *branch;

		cond_resched();
		pnode = pnode_lookup(c, i);
		if (IS_ERR(pnode))
			return PTR_ERR(pnode);
		branch = &pnode->parent->nbranch[pnode->iip];
		if (branch->lnum != lnum || branch->offs != offs)
			continue;
		if (test_bit(DIRTY_CNODE, &pnode->flags))
			return 1;
		return 0;
	}
	return 1;
}

/**
 * dbg_is_ltab_dirty - determine if a ltab node is dirty.
 * @c: the UBIFS file-system description object
 * @lnum: LEB number where ltab node was written
 * @offs: offset where ltab node was written
 */
static int dbg_is_ltab_dirty(struct ubifs_info *c, int lnum, int offs)
{
	if (lnum != c->ltab_lnum || offs != c->ltab_offs)
		return 1;
	return (c->lpt_drty_flgs & LTAB_DIRTY) != 0;
}

/**
 * dbg_is_lsave_dirty - determine if a lsave node is dirty.
 * @c: the UBIFS file-system description object
 * @lnum: LEB number where lsave node was written
 * @offs: offset where lsave node was written
 */
static int dbg_is_lsave_dirty(struct ubifs_info *c, int lnum, int offs)
{
	if (lnum != c->lsave_lnum || offs != c->lsave_offs)
		return 1;
	return (c->lpt_drty_flgs & LSAVE_DIRTY) != 0;
}

/**
 * dbg_is_node_dirty - determine if a node is dirty.
 * @c: the UBIFS file-system description object
 * @node_type: node type
 * @lnum: LEB number where node was written
 * @offs: offset where node was written
 */
static int dbg_is_node_dirty(struct ubifs_info *c, int node_type, int lnum,
			     int offs)
{
	switch (node_type) {
	case UBIFS_LPT_NNODE:
		return dbg_is_nnode_dirty(c, lnum, offs);
	case UBIFS_LPT_PNODE:
		return dbg_is_pnode_dirty(c, lnum, offs);
	case UBIFS_LPT_LTAB:
		return dbg_is_ltab_dirty(c, lnum, offs);
	case UBIFS_LPT_LSAVE:
		return dbg_is_lsave_dirty(c, lnum, offs);
	}
	return 1;
}

/**
 * dbg_check_ltab_lnum - check the ltab for a LPT LEB number.
 * @c: the UBIFS file-system description object
 * @lnum: LEB number where node was written
 * @offs: offset where node was written
 *
 * This function returns %0 on success and a negative error code on failure.
 */
static int dbg_check_ltab_lnum(struct ubifs_info *c, int lnum)
{
	int err, len = c->leb_size, dirty = 0, node_type, node_num, node_len;
	int ret;
	void *buf = c->dbg->buf;

	if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
		return 0;

	dbg_lp("LEB %d", lnum);
	err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
	if (err) {
		dbg_msg("ubi_read failed, LEB %d, error %d", lnum, err);
		return err;
	}
	while (1) {
		if (!is_a_node(c, buf, len)) {
			int i, pad_len;

			pad_len = get_pad_len(c, buf, len);
			if (pad_len) {
				buf += pad_len;
				len -= pad_len;
				dirty += pad_len;
				continue;
			}
			if (!dbg_is_all_ff(buf, len)) {
				dbg_msg("invalid empty space in LEB %d at %d",
					lnum, c->leb_size - len);
				err = -EINVAL;
			}
			i = lnum - c->lpt_first;
			if (len != c->ltab[i].free) {
				dbg_msg("invalid free space in LEB %d "
					"(free %d, expected %d)",
					lnum, len, c->ltab[i].free);
				err = -EINVAL;
			}
			if (dirty != c->ltab[i].dirty) {
				dbg_msg("invalid dirty space in LEB %d "
					"(dirty %d, expected %d)",
					lnum, dirty, c->ltab[i].dirty);
				err = -EINVAL;
			}
			return err;
		}
		node_type = get_lpt_node_type(c, buf, &node_num);
		node_len = get_lpt_node_len(c, node_type);
		ret = dbg_is_node_dirty(c, node_type, lnum, c->leb_size - len);
		if (ret == 1)
			dirty += node_len;
		buf += node_len;
		len -= node_len;
	}
}

/**
 * dbg_check_ltab - check the free and dirty space in the ltab.
 * @c: the UBIFS file-system description object
 *
 * This function returns %0 on success and a negative error code on failure.
 */
int dbg_check_ltab(struct ubifs_info *c)
{
	int lnum, err, i, cnt;

	if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
		return 0;

	/* Bring the entire tree into memory */
	cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT);
	for (i = 0; i < cnt; i++) {
		struct ubifs_pnode *pnode;

		pnode = pnode_lookup(c, i);
		if (IS_ERR(pnode))
			return PTR_ERR(pnode);
		cond_resched();
	}

	/* Check nodes */
	err = dbg_check_lpt_nodes(c, (struct ubifs_cnode *)c->nroot, 0, 0);
	if (err)
		return err;

	/* Check each LEB */
	for (lnum = c->lpt_first; lnum <= c->lpt_last; lnum++) {
		err = dbg_check_ltab_lnum(c, lnum);
		if (err) {
			dbg_err("failed at LEB %d", lnum);
			return err;
		}
	}

	dbg_lp("succeeded");
	return 0;
}

/**
 * dbg_chk_lpt_free_spc - check LPT free space is enough to write entire LPT.
 * @c: the UBIFS file-system description object
 *
 * This function returns %0 on success and a negative error code on failure.
 */
int dbg_chk_lpt_free_spc(struct ubifs_info *c)
{
	long long free = 0;
	int i;

	if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
		return 0;

	for (i = 0; i < c->lpt_lebs; i++) {
		if (c->ltab[i].tgc || c->ltab[i].cmt)
			continue;
		if (i + c->lpt_first == c->nhead_lnum)
			free += c->leb_size - c->nhead_offs;
		else if (c->ltab[i].free == c->leb_size)
			free += c->leb_size;
	}
	if (free < c->lpt_sz) {
		dbg_err("LPT space error: free %lld lpt_sz %lld",
			free, c->lpt_sz);
		dbg_dump_lpt_info(c);
		dbg_dump_lpt_lebs(c);
		dump_stack();
		return -EINVAL;
	}
	return 0;
}

/**
 * dbg_chk_lpt_sz - check LPT does not write more than LPT size.
 * @c: the UBIFS file-system description object
 * @action: action
 * @len: length written
 *
 * This function returns %0 on success and a negative error code on failure.
 */
int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len)
{
	struct ubifs_debug_info *d = c->dbg;
	long long chk_lpt_sz, lpt_sz;
	int err = 0;

	if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
		return 0;

	switch (action) {
	case 0:
		d->chk_lpt_sz = 0;
		d->chk_lpt_sz2 = 0;
		d->chk_lpt_lebs = 0;
		d->chk_lpt_wastage = 0;
		if (c->dirty_pn_cnt > c->pnode_cnt) {
			dbg_err("dirty pnodes %d exceed max %d",
				c->dirty_pn_cnt, c->pnode_cnt);
			err = -EINVAL;
		}
		if (c->dirty_nn_cnt > c->nnode_cnt) {
			dbg_err("dirty nnodes %d exceed max %d",
				c->dirty_nn_cnt, c->nnode_cnt);
			err = -EINVAL;
		}
		return err;
	case 1:
		d->chk_lpt_sz += len;
		return 0;
	case 2:
		d->chk_lpt_sz += len;
		d->chk_lpt_wastage += len;
		d->chk_lpt_lebs += 1;
		return 0;
	case 3:
		chk_lpt_sz = c->leb_size;
		chk_lpt_sz *= d->chk_lpt_lebs;
		chk_lpt_sz += len - c->nhead_offs;
		if (d->chk_lpt_sz != chk_lpt_sz) {
			dbg_err("LPT wrote %lld but space used was %lld",
				d->chk_lpt_sz, chk_lpt_sz);
			err = -EINVAL;
		}
		if (d->chk_lpt_sz > c->lpt_sz) {
			dbg_err("LPT wrote %lld but lpt_sz is %lld",
				d->chk_lpt_sz, c->lpt_sz);
			err = -EINVAL;
		}
		if (d->chk_lpt_sz2 && d->chk_lpt_sz != d->chk_lpt_sz2) {
			dbg_err("LPT layout size %lld but wrote %lld",
				d->chk_lpt_sz, d->chk_lpt_sz2);
			err = -EINVAL;
		}
		if (d->chk_lpt_sz2 && d->new_nhead_offs != len) {
			dbg_err("LPT new nhead offs: expected %d was %d",
				d->new_nhead_offs, len);
			err = -EINVAL;
		}
		lpt_sz = (long long)c->pnode_cnt * c->pnode_sz;
		lpt_sz += (long long)c->nnode_cnt * c->nnode_sz;
		lpt_sz += c->ltab_sz;
		if (c->big_lpt)
			lpt_sz += c->lsave_sz;
		if (d->chk_lpt_sz - d->chk_lpt_wastage > lpt_sz) {
			dbg_err("LPT chk_lpt_sz %lld + waste %lld exceeds %lld",
				d->chk_lpt_sz, d->chk_lpt_wastage, lpt_sz);
			err = -EINVAL;
		}
		if (err) {
			dbg_dump_lpt_info(c);
			dbg_dump_lpt_lebs(c);
			dump_stack();
		}
		d->chk_lpt_sz2 = d->chk_lpt_sz;
		d->chk_lpt_sz = 0;
		d->chk_lpt_wastage = 0;
		d->chk_lpt_lebs = 0;
		d->new_nhead_offs = len;
		return err;
	case 4:
		d->chk_lpt_sz += len;
		d->chk_lpt_wastage += len;
		return 0;
	default:
		return -EINVAL;
	}
}

/**
 * dbg_dump_lpt_leb - dump an LPT LEB.
 * @c: UBIFS file-system description object
 * @lnum: LEB number to dump
 *
 * This function dumps an LEB from LPT area. Nodes in this area are very
 * different to nodes in the main area (e.g., they do not have common headers,
 * they do not have 8-byte alignments, etc), so we have a separate function to
 * dump LPT area LEBs. Note, LPT has to be locked by the coller.
 */
static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
{
	int err, len = c->leb_size, node_type, node_num, node_len, offs;
	void *buf = c->dbg->buf;

	printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
	       current->pid, lnum);
	err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
	if (err) {
		ubifs_err("cannot read LEB %d, error %d", lnum, err);
		return;
	}
	while (1) {
		offs = c->leb_size - len;
		if (!is_a_node(c, buf, len)) {
			int pad_len;

			pad_len = get_pad_len(c, buf, len);
			if (pad_len) {
				printk(KERN_DEBUG "LEB %d:%d, pad %d bytes\n",
				       lnum, offs, pad_len);
				buf += pad_len;
				len -= pad_len;
				continue;
			}
			if (len)
				printk(KERN_DEBUG "LEB %d:%d, free %d bytes\n",
				       lnum, offs, len);
			break;
		}

		node_type = get_lpt_node_type(c, buf, &node_num);
		switch (node_type) {
		case UBIFS_LPT_PNODE:
		{
			node_len = c->pnode_sz;
			if (c->big_lpt)
				printk(KERN_DEBUG "LEB %d:%d, pnode num %d\n",
				       lnum, offs, node_num);
			else
				printk(KERN_DEBUG "LEB %d:%d, pnode\n",
				       lnum, offs);
			break;
		}
		case UBIFS_LPT_NNODE:
		{
			int i;
			struct ubifs_nnode nnode;

			node_len = c->nnode_sz;
			if (c->big_lpt)
				printk(KERN_DEBUG "LEB %d:%d, nnode num %d, ",
				       lnum, offs, node_num);
			else
				printk(KERN_DEBUG "LEB %d:%d, nnode, ",
				       lnum, offs);
			err = ubifs_unpack_nnode(c, buf, &nnode);
			for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
				printk("%d:%d", nnode.nbranch[i].lnum,
				       nnode.nbranch[i].offs);
				if (i != UBIFS_LPT_FANOUT - 1)
					printk(", ");
			}
			printk("\n");
			break;
		}
		case UBIFS_LPT_LTAB:
			node_len = c->ltab_sz;
			printk(KERN_DEBUG "LEB %d:%d, ltab\n",
			       lnum, offs);
			break;
		case UBIFS_LPT_LSAVE:
			node_len = c->lsave_sz;
			printk(KERN_DEBUG "LEB %d:%d, lsave len\n", lnum, offs);
			break;
		default:
			ubifs_err("LPT node type %d not recognized", node_type);
			return;
		}

		buf += node_len;
		len -= node_len;
	}

	printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n",
	       current->pid, lnum);
}

/**
 * dbg_dump_lpt_lebs - dump LPT lebs.
 * @c: UBIFS file-system description object
 *
 * This function dumps all LPT LEBs. The caller has to make sure the LPT is
 * locked.
 */
void dbg_dump_lpt_lebs(const struct ubifs_info *c)
{
	int i;

	printk(KERN_DEBUG "(pid %d) start dumping all LPT LEBs\n",
	       current->pid);
	for (i = 0; i < c->lpt_lebs; i++)
		dump_lpt_leb(c, i + c->lpt_first);
	printk(KERN_DEBUG "(pid %d) finish dumping all LPT LEBs\n",
	       current->pid);
}

#endif /* CONFIG_UBIFS_FS_DEBUG */