summaryrefslogtreecommitdiff
path: root/tests/fs-tests/integrity/integck.c
blob: 8a53c05d1e044b85af53445d12be1534ef3e41a5 (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
/*
 * Copyright (C) 2007 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
 *
 * Author: Adrian Hunter
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <dirent.h>

#include "tests.h"

/* Structures to store data written to the test file system,
   so that we can check whether the file system is correct. */

struct write_info /* Record of random data written into a file */
{
	struct write_info *next;
	off_t offset; /* Where in the file the data was written */
	size_t size; /* Number of bytes written */
	unsigned random_seed; /* Seed for rand() to create random data */
	off_t random_offset; /* Call rand() this number of times first */
	int trunc; /* Records a truncation (raw_writes only) */
};

struct file_info /* Each file has one of these */
{
	char *name;
	struct dir_info *parent; /* Parent directory */
	struct write_info *writes; /* Record accumulated writes to the file */
	struct write_info *raw_writes;
				/* Record in order all writes to the file */
	struct fd_info *fds; /* All open file descriptors for this file */
	off_t length;
	int deleted; /* File has been deleted but is still open */
	int no_space_error; /* File has incurred a ENOSPC error */
};

struct dir_info /* Each directory has one of these */
{
	char *name;
	struct dir_info *parent; /* Parent directory or null
					for our top directory */
	unsigned number_of_entries;
	struct dir_entry_info *first;
};

struct dir_entry_info /* Each entry in a directory has one of these */
{
	struct dir_entry_info *next;
	char type; /* f => file, d=> dir */
	int checked; /* Temporary flag used when checking */
	union entry_
	{
		struct file_info *file;
		struct dir_info *dir;
	} entry;
};

struct fd_info /* We keep a number of files open */
{
	struct fd_info *next;
	struct file_info *file;
	int fd;
};

struct open_file_info /* We keep a list of open files */
{
	struct open_file_info *next;
	struct fd_info *fdi;
};

static struct dir_info *top_dir = NULL; /* Our top directory */

static struct open_file_info *open_files = NULL; /* We keep a list of
							open files */
static size_t open_files_count = 0;

static int grow   = 1; /* Should we try to grow files and directories */
static int shrink = 0; /* Should we try to shrink files and directories */
static int full   = 0; /* Flag that the file system is full */
static uint64_t operation_count = 0; /* Number of operations used to fill
                                        up the file system */
static uint64_t initial_free_space = 0; /* Free space on file system when
					   test starts */
static unsigned log10_initial_free_space = 0; /* log10 of initial_free_space */

static char *copy_string(const char *s)
{
	char *str;

	if (!s)
		return NULL;
	str = (char *) malloc(strlen(s) + 1);
	CHECK(str != NULL);
	strcpy(str, s);
	return str;
}

static char *cat_strings(const char *a, const char *b)
{
	char *str;
	size_t sz;

	if (a && !b)
		return copy_string(a);
	if (b && !a)
		return copy_string(b);
	if (!a && !b)
		return NULL;
	sz = strlen(a) + strlen(b) + 1;
	str = (char *) malloc(sz);
	CHECK(str != NULL);
	strcpy(str, a);
	strcat(str, b);
	return str;
}

static char *cat_paths(const char *a, const char *b)
{
	char *str;
	size_t sz;
	int as, bs;
	size_t na, nb;

	if (a && !b)
		return copy_string(a);
	if (b && !a)
		return copy_string(b);
	if (!a && !b)
		return NULL;

	as = 0;
	bs = 0;
	na = strlen(a);
	nb = strlen(b);
	if (na && a[na - 1] == '/')
		as = 1;
	if (nb && b[0] == '/')
		bs = 1;
	if ((as && !bs) || (!as && bs))
		return cat_strings(a, b);
	if (as && bs)
		return cat_strings(a, b + 1);

	sz = na + nb + 2;
	str = (char *) malloc(sz);
	CHECK(str != NULL);
	strcpy(str, a);
	strcat(str, "/");
	strcat(str, b);
	return str;
}

static char *dir_path(struct dir_info *parent, const char *name)
{
	char *parent_path;
	char *path;

	if (!parent)
		return cat_paths(tests_file_system_mount_dir, name);
	parent_path = dir_path(parent->parent, parent->name);
	path = cat_paths(parent_path, name);
	free(parent_path);
	return path;
}

static struct dir_entry_info *dir_entry_new(void)
{
	struct dir_entry_info *entry;
	size_t sz;

	sz = sizeof(struct dir_entry_info);
	entry = (struct dir_entry_info *) malloc(sz);
	CHECK(entry != NULL);
	memset(entry, 0, sz);
	return entry;
}

static void open_file_add(struct fd_info *fdi)
{
	struct open_file_info *ofi;
	size_t sz;

	sz = sizeof(struct open_file_info);
	ofi = (struct open_file_info *) malloc(sz);
	CHECK(ofi != NULL);
	memset(ofi, 0, sz);
	ofi->next = open_files;
	ofi->fdi = fdi;
	open_files = ofi;
	open_files_count += 1;
}

static void open_file_remove(struct fd_info *fdi)
{
	struct open_file_info *ofi;
	struct open_file_info **prev;

	prev = &open_files;
	for (ofi = open_files; ofi; ofi = ofi->next) {
		if (ofi->fdi == fdi) {
			*prev = ofi->next;
			free(ofi);
			open_files_count -= 1;
			return;
		}
		prev = &ofi->next;
	}
	CHECK(0); /* We are trying to remove something that is not there */
}

static struct fd_info *fd_new(struct file_info *file, int fd)
{
	struct fd_info *fdi;
	size_t sz;

	sz = sizeof(struct fd_info);
	fdi = (struct fd_info *) malloc(sz);
	CHECK(fdi != NULL);
	memset(fdi, 0, sz);
	fdi->next = file->fds;
	fdi->file = file;
	fdi->fd = fd;
	file->fds = fdi;
	open_file_add(fdi);
	return fdi;
}

static struct dir_info *dir_new(struct dir_info *parent, const char *name)
{
	struct dir_info *dir;
	size_t sz;
	char *path;

	path = dir_path(parent, name);
	if (mkdir(path, 0777) == -1) {
		CHECK(errno == ENOSPC);
		full = 1;
		free(path);
		return NULL;
	}
	free(path);

	sz = sizeof(struct dir_info);
	dir = (struct dir_info *) malloc(sz);
	CHECK(dir != NULL);
	memset(dir, 0, sz);
	dir->name = copy_string(name);
	dir->parent = parent;
	if (parent) {
		struct dir_entry_info *entry;

		entry = dir_entry_new();
		entry->type = 'd';
		entry->entry.dir = dir;
		entry->next = parent->first;
		parent->first = entry;
		parent->number_of_entries += 1;
	}
	return dir;
}

static void file_delete(struct file_info *file);

static void dir_remove(struct dir_info *dir)
{
	char *path;
	struct dir_entry_info *entry;
	struct dir_entry_info **prev;
	int found;

	/* Remove directory contents */
	while (dir->first) {
		struct dir_entry_info *entry;

		entry = dir->first;
		if (entry->type == 'd')
			dir_remove(entry->entry.dir);
		else if (entry->type == 'f')
			file_delete(entry->entry.file);
		else
			CHECK(0); /* Invalid struct dir_entry_info */
	}
	/* Remove entry from parent directory */
	found = 0;
	prev = &dir->parent->first;
	for (entry = dir->parent->first; entry; entry = entry->next) {
		if (entry->type == 'd' && entry->entry.dir == dir) {
			dir->parent->number_of_entries -= 1;
			*prev = entry->next;
			free(entry);
			found = 1;
			break;
		}
		prev = &entry->next;
	}
	CHECK(found); /* Check the file is in the parent directory */
	/* Remove directory itself */
	path = dir_path(dir->parent, dir->name);
	CHECK(rmdir(path) != -1);
}

static struct file_info *file_new(struct dir_info *parent, const char *name)
{
	struct file_info *file = NULL;
	char *path;
	mode_t mode;
	int fd;
	size_t sz;
	struct dir_entry_info *entry;

	CHECK(parent != NULL);

	path = dir_path(parent, name);
	mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH;
	fd = open(path, O_CREAT | O_EXCL | O_RDWR, mode);
	if (fd == -1) {
		CHECK(errno == ENOSPC);
		free(path);
		full = 1;
		return NULL;
	}
	free(path);

	sz = sizeof(struct file_info);
	file = (struct file_info *) malloc(sz);
	CHECK(file != NULL);
	memset(file, 0, sz);
	file->name = copy_string(name);
	file->parent = parent;

	fd_new(file, fd);

	entry = dir_entry_new();
	entry->type = 'f';
	entry->entry.file = file;
	entry->next = parent->first;
	parent->first = entry;
	parent->number_of_entries += 1;

	return file;
}

static void file_delete(struct file_info *file)
{
	char *path;
	struct dir_entry_info *entry;
	struct dir_entry_info **prev;
	int found;

	/* Remove file entry from parent directory */
	found = 0;
	prev = &file->parent->first;
	for (entry = file->parent->first; entry; entry = entry->next) {
		if (entry->type == 'f' && entry->entry.file == file) {
			file->parent->number_of_entries -= 1;
			*prev = entry->next;
			free(entry);
			found = 1;
			break;
		}
		prev = &entry->next;
	}
	CHECK(found); /* Check the file is in the parent directory */

	/* Delete the file */
	path = dir_path(file->parent, file->name);
	CHECK(unlink(path) != -1);
	free(path);

	/* Free struct file_info if file is not open */
	if (!file->fds) {
		struct write_info *w, *next;

		free(file->name);
		w = file->writes;
		while (w) {
			next = w->next;
			free(w);
			w = next;
		}
		free(file);
	} else
		file->deleted = 1;
}

static void file_info_display(struct file_info *file)
{
	struct write_info *w;
	unsigned wcnt;

	fprintf(stderr, "File Info:\n");
	fprintf(stderr, "    Name: %s\n", file->name);
	fprintf(stderr, "    Directory: %s\n", file->parent->name);
	fprintf(stderr, "    Length: %u\n", (unsigned) file->length);
	fprintf(stderr, "    File was open: %s\n",
		(file->fds == NULL) ? "false" : "true");
	fprintf(stderr, "    File was deleted: %s\n",
		(file->deleted == 0) ? "false" : "true");
	fprintf(stderr, "    File was out of space: %s\n",
		(file->no_space_error == 0) ? "false" : "true");
	fprintf(stderr, "    Write Info:\n");
	wcnt = 0;
	w = file->writes;
	while (w) {
		fprintf(stderr, "        Offset: %u  Size: %u  Seed: %u"
				"  R.Off: %u\n",
				(unsigned) w->offset,
				(unsigned) w->size,
				(unsigned) w->random_seed,
				(unsigned) w->random_offset);
		wcnt += 1;
		w = w->next;
	}
	fprintf(stderr, "    %u writes\n", wcnt);
	fprintf(stderr, "    ============================================\n");
	fprintf(stderr, "    Raw Write Info:\n");
	wcnt = 0;
	w = file->raw_writes;
	while (w) {
		if (w->trunc)
			fprintf(stderr, "        Trunc from %u to %u\n",
					(unsigned) w->offset,
					(unsigned) w->random_offset);
		else
			fprintf(stderr, "        Offset: %u  Size: %u  Seed: %u"
					"  R.Off: %u\n",
					(unsigned) w->offset,
					(unsigned) w->size,
					(unsigned) w->random_seed,
					(unsigned) w->random_offset);
		wcnt += 1;
		w = w->next;
	}
	fprintf(stderr, "    %u writes or truncations\n", wcnt);
	fprintf(stderr, "    ============================================\n");
}

static struct fd_info *file_open(struct file_info *file)
{
	int fd;
	char *path;

	path = dir_path(file->parent, file->name);
	fd = open(path, O_RDWR);
	CHECK(fd != -1);
	free(path);
	return fd_new(file, fd);
}

#define BUFFER_SIZE 32768

static size_t file_write_data(	struct file_info *file,
				int fd,
				off_t offset,
				size_t size,
				unsigned seed)
{
	size_t remains, actual, block;
	ssize_t written;
	char buf[BUFFER_SIZE];

	srand(seed);
	CHECK(lseek(fd, offset, SEEK_SET) != (off_t) -1);
	remains = size;
	actual = 0;
	written = BUFFER_SIZE;
	while (remains) {
		/* Fill up buffer with random data */
		if (written < BUFFER_SIZE) {
			memmove(buf, buf + written, BUFFER_SIZE - written);
			written = BUFFER_SIZE - written;
		} else
			written = 0;
		for (; written < BUFFER_SIZE; ++written)
			buf[written] = rand();
		/* Write a block of data */
		if (remains > BUFFER_SIZE)
			block = BUFFER_SIZE;
		else
			block = remains;
		written = write(fd, buf, block);
		if (written < 0) {
			CHECK(errno == ENOSPC); /* File system full */
			full = 1;
			file->no_space_error = 1;
			break;
		}
		remains -= written;
		actual += written;
	}
	return actual;
}

static void file_write_info(struct file_info *file,
			off_t offset,
			size_t size,
			unsigned seed)
{
	struct write_info *new_write, *w, **prev, *tmp;
	int inserted;
	size_t sz;
	off_t end, chg;

	/* Create struct write_info */
	sz = sizeof(struct write_info);
	new_write = (struct write_info *) malloc(sz);
	CHECK(new_write != NULL);
	memset(new_write, 0, sz);
	new_write->offset = offset;
	new_write->size = size;
	new_write->random_seed = seed;

	w = (struct write_info *) malloc(sz);
	CHECK(w != NULL);
	memset(w, 0, sz);
	w->next = file->raw_writes;
	w->offset = offset;
	w->size = size;
	w->random_seed = seed;
	file->raw_writes = w;

	/* Insert it into file->writes */
	inserted = 0;
	end = offset + size;
	w = file->writes;
	prev = &file->writes;
	while (w) {
		if (w->offset >= end) {
			/* w comes after new_write, so insert before it */
			new_write->next = w;
			*prev = new_write;
			inserted = 1;
			break;
		}
		/* w does not come after new_write */
		if (w->offset + w->size > offset) {
			/* w overlaps new_write */
			if (w->offset < offset) {
				/* w begins before new_write begins */
				if (w->offset + w->size <= end)
					/* w ends before new_write ends */
					w->size = offset - w->offset;
				else {
					/* w ends after new_write ends */
					/* Split w */
					tmp = (struct write_info *) malloc(sz);
					CHECK(tmp != NULL);
					*tmp = *w;
					chg = end - tmp->offset;
					tmp->offset += chg;
					tmp->random_offset += chg;
					tmp->size -= chg;
					w->size = offset - w->offset;
					/* Insert new struct write_info */
					w->next = new_write;
					new_write->next = tmp;
					inserted = 1;
					break;
				}
			} else {
				/* w begins after new_write begins */
				if (w->offset + w->size <= end) {
					/* w is completely overlapped,
					   so remove it */
					*prev = w->next;
					tmp = w;
					w = w->next;
					free(tmp);
					continue;
				}
				/* w ends after new_write ends */
				chg = end - w->offset;
				w->offset += chg;
				w->random_offset += chg;
				w->size -= chg;
				continue;
			}
		}
		prev = &w->next;
		w = w->next;
	}
	if (!inserted)
		*prev = new_write;
	/* Update file length */
	if (end > file->length)
		file->length = end;
}

/* Randomly select offset and and size to write in a file */
static void get_offset_and_size(struct file_info *file,
				off_t *offset,
				size_t *size)
{
	size_t r, n;

	r = tests_random_no(100);
	if (r == 0 && grow)
		/* 1 time in 100, when growing, write off the end of the file */
		*offset = file->length + tests_random_no(10000000);
	else if (r < 4)
		/* 3 (or 4) times in 100, write at the beginning of file */
		*offset = 0;
	else if (r < 52 || !grow)
		/* 48 times in 100, write into the file */
		*offset = tests_random_no(file->length);
	else
		/* 48 times in 100, write at the end of the  file */
		*offset = file->length;
	/* Distribute the size logarithmically */
	if (tests_random_no(1000) == 0)
		r = tests_random_no(log10_initial_free_space + 2);
	else
		r = tests_random_no(log10_initial_free_space);
	n = 1;
	while (r--)
		n *= 10;
	*size = tests_random_no(n);
	if (!grow && *offset + *size > file->length)
		*size = file->length - *offset;
	if (*size == 0)
		*size = 1;
}

static void file_truncate_info(struct file_info *file, size_t new_length);
static void file_close(struct fd_info *fdi);

static int file_ftruncate(struct file_info *file, int fd, off_t new_length)
{
	if (ftruncate(fd, new_length) == -1) {
		CHECK(errno = ENOSPC);
		file->no_space_error = 1;
		/* Delete errored files */
		if (!file->deleted) {
			struct fd_info *fdi;

			fdi = file->fds;
			while (fdi) {
				file_close(fdi);
				fdi = file->fds;
			}
			file_delete(file);
		}
		return 0;
	}
	return 1;
}

static void file_write(struct file_info *file, int fd)
{
	off_t offset;
	size_t size, actual;
	unsigned seed;
	int truncate = 0;

	get_offset_and_size(file, &offset, &size);
	seed = tests_random_no(10000000);
	actual = file_write_data(file, fd, offset, size, seed);

	if (offset + actual <= file->length && shrink)
		/* 1 time in 100, when shrinking
		   truncate after the write */
		if (tests_random_no(100) == 0)
			truncate = 1;

	if (actual != 0)
		file_write_info(file, offset, actual, seed);

	/* Delete errored files */
	if (file->no_space_error) {
		if (!file->deleted) {
			struct fd_info *fdi;

			fdi = file->fds;
			while (fdi) {
				file_close(fdi);
				fdi = file->fds;
			}
			file_delete(file);
		}
		return;
	}

	if (truncate) {
		size_t new_length = offset + actual;
		if (file_ftruncate(file, fd, new_length))
			file_truncate_info(file, new_length);
	}
}

static void file_write_file(struct file_info *file)
{
	int fd;
	char *path;

	path = dir_path(file->parent, file->name);
	fd = open(path, O_WRONLY);
	CHECK(fd != -1);
	file_write(file, fd);
	CHECK(close(fd) != -1);
	free(path);
}

static void file_truncate_info(struct file_info *file, size_t new_length)
{
	struct write_info *w, **prev, *tmp;
	size_t sz;

	/* Remove / truncate file->writes */
	w = file->writes;
	prev = &file->writes;
	while (w) {
		if (w->offset >= new_length) {
			/* w comes after eof, so remove it */
			*prev = w->next;
			tmp = w;
			w = w->next;
			free(tmp);
			continue;
		}
		if (w->offset + w->size > new_length)
			w->size = new_length - w->offset;
		prev = &w->next;
		w = w->next;
	}
	/* Add an entry in raw_writes for the truncation */
	sz = sizeof(struct write_info);
	w = (struct write_info *) malloc(sz);
	CHECK(w != NULL);
	memset(w, 0, sz);
	w->next = file->raw_writes;
	w->offset = file->length;
	w->random_offset = new_length; /* Abuse random_offset */
	w->trunc = 1;
	file->raw_writes = w;
	/* Update file length */
	file->length = new_length;
}

static void file_truncate(struct file_info *file, int fd)
{
	size_t new_length;

	new_length = tests_random_no(file->length);

	if (file_ftruncate(file, fd, new_length))
		file_truncate_info(file, new_length);
}

static void file_truncate_file(struct file_info *file)
{
	int fd;
	char *path;

	path = dir_path(file->parent, file->name);
	fd = open(path, O_WRONLY);
	CHECK(fd != -1);
	file_truncate(file, fd);
	CHECK(close(fd) != -1);
	free(path);
}

static void file_close(struct fd_info *fdi)
{
	struct file_info *file;
	struct fd_info *fdp;
	struct fd_info **prev;

	/* Close file */
	CHECK(close(fdi->fd) != -1);
	/* Remove struct fd_info */
	open_file_remove(fdi);
	file = fdi->file;
	prev = &file->fds;
	for (fdp = file->fds; fdp; fdp = fdp->next) {
		if (fdp == fdi) {
			*prev = fdi->next;
			free(fdi);
			if (file->deleted && !file->fds) {
				/* Closing deleted file */
				struct write_info *w, *next;

				w = file->writes;
				while (w) {
					next = w->next;
					free(w);
					w = next;
				}
				free(file->name);
				free(file);
			}
			return;
		}
		prev = &fdp->next;
	}
	CHECK(0); /* Didn't find struct fd_info */
}

static void file_rewrite_data(int fd, struct write_info *w, char *buf)
{
	size_t remains, block;
	ssize_t written;
	off_t r;

	srand(w->random_seed);
	for (r = 0; r < w->random_offset; ++r)
		rand();
	CHECK(lseek(fd, w->offset, SEEK_SET) != (off_t) -1);
	remains = w->size;
	written = BUFFER_SIZE;
	while (remains) {
		/* Fill up buffer with random data */
		if (written < BUFFER_SIZE)
			memmove(buf, buf + written, BUFFER_SIZE - written);
		else
			written = 0;
		for (; written < BUFFER_SIZE; ++written)
			buf[written] = rand();
		/* Write a block of data */
		if (remains > BUFFER_SIZE)
			block = BUFFER_SIZE;
		else
			block = remains;
		written = write(fd, buf, block);
		CHECK(written == block);
		remains -= written;
	}
}

static void save_file(int fd, struct file_info *file)
{
	int w_fd;
	struct write_info *w;
	char buf[BUFFER_SIZE];
	char name[256];

	/* Open file to save contents to */
	strcpy(name, "/tmp/");
	strcat(name, file->name);
	strcat(name, ".integ.sav.read");
	fprintf(stderr, "Saving %s\n", name);
	w_fd = open(name, O_CREAT | O_WRONLY, 0777);
	CHECK(w_fd != -1);

	/* Start at the beginning */
	CHECK(lseek(fd, 0, SEEK_SET) != (off_t) -1);
	
	for (;;) {
		ssize_t r = read(fd, buf, BUFFER_SIZE);
		CHECK(r != -1);
		if (!r)
			break;
		CHECK(write(w_fd, buf, r) == r);
	}
	CHECK(close(w_fd) != -1);

	/* Open file to save contents to */
	strcpy(name, "/tmp/");
	strcat(name, file->name);
	strcat(name, ".integ.sav.written");
	fprintf(stderr, "Saving %s\n", name);
	w_fd = open(name, O_CREAT | O_WRONLY, 0777);
	CHECK(w_fd != -1);

	for (w = file->writes; w; w = w->next)
		file_rewrite_data(w_fd, w, buf);

	CHECK(close(w_fd) != -1);
}

static void file_check_hole(	struct file_info *file,
				int fd, off_t offset,
				size_t size)
{
	size_t remains, block, i;
	char buf[BUFFER_SIZE];

	CHECK(lseek(fd, offset, SEEK_SET) != (off_t) -1);
	remains = size;
	while (remains) {
		if (remains > BUFFER_SIZE)
			block = BUFFER_SIZE;
		else
			block = remains;
		CHECK(read(fd, buf, block) == block);
		for (i = 0; i < block; ++i) {
			if (buf[i] != 0) {
				fprintf(stderr, "file_check_hole failed at %u "
					"checking hole at %u size %u\n",
					(unsigned) (size - remains + i),
					(unsigned) offset,
					(unsigned) size);
				file_info_display(file);
				save_file(fd, file);
			}
			CHECK(buf[i] == 0);
		}
		remains -= block;
	}
}

static void file_check_data(	struct file_info *file,
				int fd,
				struct write_info *w)
{
	size_t remains, block, i;
	off_t r;
	char buf[BUFFER_SIZE];

	srand(w->random_seed);
	for (r = 0; r < w->random_offset; ++r)
		rand();
	CHECK(lseek(fd, w->offset, SEEK_SET) != (off_t) -1);
	remains = w->size;
	while (remains) {
		if (remains > BUFFER_SIZE)
			block = BUFFER_SIZE;
		else
			block = remains;
		CHECK(read(fd, buf, block) == block);
		for (i = 0; i < block; ++i) {
			char c = (char) rand();
			if (buf[i] != c) {
				fprintf(stderr, "file_check_data failed at %u "
					"checking data at %u size %u\n",
					(unsigned) (w->size - remains + i),
					(unsigned) w->offset,
					(unsigned) w->size);
				file_info_display(file);
				save_file(fd, file);
			}
			CHECK(buf[i] == c);
		}
		remains -= block;
	}
}

static void file_check(struct file_info *file, int fd)
{
	int open_and_close = 0;
	char *path = NULL;
	off_t pos;
	struct write_info *w;

	/* Do not check files that have errored */
	if (file->no_space_error)
		return;
	if (fd == -1)
		open_and_close = 1;
	if (open_and_close) {
		/* Open file */
		path = dir_path(file->parent, file->name);
		fd = open(path, O_RDONLY);
		CHECK(fd != -1);
	}
	/* Check length */
	pos = lseek(fd, 0, SEEK_END);
	if (pos != file->length) {
		fprintf(stderr, "file_check failed checking length "
			"expected %u actual %u\n",
			(unsigned) file->length,
			(unsigned) pos);
		file_info_display(file);
		save_file(fd, file);
	}
	CHECK(pos == file->length);
	/* Check each write */
	pos = 0;
	for (w = file->writes; w; w = w->next) {
		if (w->offset > pos)
			file_check_hole(file, fd, pos, w->offset - pos);
		file_check_data(file, fd, w);
		pos = w->offset + w->size;
	}
	if (file->length > pos)
		file_check_hole(file, fd, pos, file->length - pos);
	if (open_and_close) {
		CHECK(close(fd) != -1);
		free(path);
	}
}

static const char *dir_entry_name(const struct dir_entry_info *entry)
{
	CHECK(entry != NULL);
	if (entry->type == 'd')
		return entry->entry.dir->name;
	else if (entry->type == 'f')
		return entry->entry.file->name;
	else {
		CHECK(0);
		return NULL;
	}
}

static int search_comp(const void *pa, const void *pb)
{
	const struct dirent *a = (const struct dirent *) pa;
	const struct dir_entry_info *b = * (const struct dir_entry_info **) pb;
	return strcmp(a->d_name, dir_entry_name(b));
}

static void dir_entry_check(struct dir_entry_info **entry_array,
			size_t number_of_entries,
			struct dirent *ent)
{
	struct dir_entry_info **found;
	struct dir_entry_info *entry;
	size_t sz;

	sz = sizeof(struct dir_entry_info *);
	found = bsearch(ent, entry_array, number_of_entries, sz, search_comp);
	CHECK(found != NULL);
	entry = *found;
	CHECK(!entry->checked);
	entry->checked = 1;
}

static int sort_comp(const void *pa, const void *pb)
{
	const struct dir_entry_info *a = * (const struct dir_entry_info **) pa;
	const struct dir_entry_info *b = * (const struct dir_entry_info **) pb;
	return strcmp(dir_entry_name(a), dir_entry_name(b));
}

static void dir_check(struct dir_info *dir)
{
	struct dir_entry_info **entry_array, **p;
	size_t sz, n;
	struct dir_entry_info *entry;
	DIR *d;
	struct dirent *ent;
	unsigned checked = 0;
	char *path;

	/* Create an array of entries */
	sz = sizeof(struct dir_entry_info *);
	n = dir->number_of_entries;
	entry_array = (struct dir_entry_info **) malloc(sz * n);
	CHECK(entry_array != NULL);

	entry = dir->first;
	p = entry_array;
	while (entry) {
		*p++ = entry;
		entry->checked = 0;
		entry = entry->next;
	}

	/* Sort it by name */
	qsort(entry_array, n, sz, sort_comp);

	/* Go through directory on file system checking entries match */
	path = dir_path(dir->parent, dir->name);
	d = opendir(path);
	CHECK(d != NULL);
	for (;;) {
		errno = 0;
		ent = readdir(d);
		if (ent) {
			if (strcmp(".",ent->d_name) != 0 &&
					strcmp("..",ent->d_name) != 0) {
				dir_entry_check(entry_array, n, ent);
				checked += 1;
			}
		} else {
			CHECK(errno == 0);
			break;
		}
	}
	CHECK(closedir(d) != -1);
	CHECK(checked == dir->number_of_entries);
	free(path);

	/* Now check each entry */
	entry = dir->first;
	while (entry) {
		if (entry->type == 'd')
			dir_check(entry->entry.dir);
		else if (entry->type == 'f')
			file_check(entry->entry.file, -1);
		else
			CHECK(0);
		entry = entry->next;
	}

	free(entry_array);
}

static void check_deleted_files(void)
{
	struct open_file_info *ofi;

	for (ofi = open_files; ofi; ofi = ofi->next)
		if (ofi->fdi->file->deleted)
			file_check(ofi->fdi->file, ofi->fdi->fd);
}

static void close_open_files(void)
{
	struct open_file_info *ofi;

	for (ofi = open_files; ofi; ofi = open_files)
		file_close(ofi->fdi);
}

static char *make_name(struct dir_info *dir)
{
	static char name[256];
	struct dir_entry_info *entry;
	int found;

	do {
		found = 0;
		sprintf(name, "%u", (unsigned) tests_random_no(1000000));
		for (entry = dir->first; entry; entry = entry->next) {
			if (strcmp(dir_entry_name(entry), name) == 0) {
				found = 1;
				break;
			}
		}
	} while (found);
	return name;
}

static void operate_on_dir(struct dir_info *dir);
static void operate_on_file(struct file_info *file);

/* Randomly select something to do with a directory entry */
static void operate_on_entry(struct dir_entry_info *entry)
{
	/* If shrinking, 1 time in 50, remove a directory */
	if (entry->type == 'd') {
		if (shrink && tests_random_no(50) == 0) {
			dir_remove(entry->entry.dir);
			return;
		}
		operate_on_dir(entry->entry.dir);
	}
	/* If shrinking, 1 time in 10, remove a file */
	if (entry->type == 'f') {
		if (shrink && tests_random_no(10) == 0) {
			file_delete(entry->entry.file);
			return;
		}
		operate_on_file(entry->entry.file);
	}
}

/* Randomly select something to do with a directory */
static void operate_on_dir(struct dir_info *dir)
{
	size_t r;
	struct dir_entry_info *entry;

	r = tests_random_no(12);
	if (r == 0 && grow)
		/* When growing, 1 time in 12 create a file */
		file_new(dir, make_name(dir));
	else if (r == 1 && grow)
		/* When growing, 1 time in 12 create a directory */
		dir_new(dir, make_name(dir));
	else {
		/* Otherwise randomly select an entry to operate on */
		r = tests_random_no(dir->number_of_entries);
		entry = dir->first;
		while (entry && r) {
			entry = entry->next;
			--r;
		}
		if (entry)
			operate_on_entry(entry);
	}
}

/* Randomly select something to do with a file */
static void operate_on_file(struct file_info *file)
{
	/* Try to keep at least 10 files open */
	if (open_files_count < 10) {
		file_open(file);
		return;
	}
	/* Try to keep about 20 files open */
	if (open_files_count < 20 && tests_random_no(2) == 0) {
		file_open(file);
		return;
	}
	/* Try to keep up to 40 files open */
	if (open_files_count < 40 && tests_random_no(20) == 0) {
		file_open(file);
		return;
	}
	/* Occasionly truncate */
	if (shrink && tests_random_no(100) == 0) {
		file_truncate_file(file);
		return;
	}
	/* Mostly just write */
	file_write_file(file);
}

/* Randomly select something to do with an open file */
static void operate_on_open_file(struct fd_info *fdi)
{
	size_t r;

	r = tests_random_no(1000);
	if (shrink && r < 5)
		file_truncate(fdi->file, fdi->fd);
	else if (r < 21)
		file_close(fdi);
	else if (shrink && r < 121 && !fdi->file->deleted)
		file_delete(fdi->file);
	else
		file_write(fdi->file, fdi->fd);
}

/* Select an open file at random */
static void operate_on_an_open_file(void)
{
	size_t r;
	struct open_file_info *ofi;

	/* When shrinking, close all open files 1 time in 128 */
	if (shrink) {
		static int x = 0;

		x += 1;
		x &= 127;
		if (x == 0) {
			close_open_files();
			return;
		}
	}
	/* Close any open files that have errored */
	ofi = open_files;
	while (ofi) {
		if (ofi->fdi->file->no_space_error) {
			struct fd_info *fdi;

			fdi = ofi->fdi;
			ofi = ofi->next;
			file_close(fdi);
		} else
			ofi = ofi->next;
	}
	r = tests_random_no(open_files_count);
	for (ofi = open_files; ofi; ofi = ofi->next, --r)
		if (!r) {
			operate_on_open_file(ofi->fdi);
			return;
		}
}

static void do_an_operation(void)
{
	/* Half the time operate on already open files */
	if (tests_random_no(100) < 50)
		operate_on_dir(top_dir);
	else
		operate_on_an_open_file();
}

static void create_test_data(void)
{
	uint64_t i, n;

	grow = 1;
	shrink = 0;
	full = 0;
	operation_count = 0;
	while (!full) {
		do_an_operation();
		++operation_count;
	}
	grow = 0;
	shrink = 1;
	/* Drop to less than 90% full */
	n = operation_count / 40;
	while (n--) {
		uint64_t free;
		uint64_t total;
		for (i = 0; i < 10; ++i)
			do_an_operation();
		free = tests_get_free_space();
		total = tests_get_total_space();
		if ((free * 100) / total >= 10)
			break;
	}
	grow = 0;
	shrink = 0;
	full = 0;
	n = operation_count * 2;
	for (i = 0; i < n; ++i)
		do_an_operation();
}

static void update_test_data(void)
{
	uint64_t i, n;

	grow = 1;
	shrink = 0;
	full = 0;
	while (!full)
		do_an_operation();
	grow = 0;
	shrink = 1;
	/* Drop to less than 50% full */
	n = operation_count / 10;
	while (n--) {
		uint64_t free;
		uint64_t total;
		for (i = 0; i < 10; ++i)
			do_an_operation();
		free = tests_get_free_space();
		total = tests_get_total_space();
		if ((free * 100) / total >= 50)
			break;
	}
	grow = 0;
	shrink = 0;
	full = 0;
	n = operation_count * 2;
	for (i = 0; i < n; ++i)
		do_an_operation();
}

void integck(void)
{
	pid_t pid;
	int64_t rpt;
	uint64_t z;
	char dir_name[256];

	/* Make our top directory */
	pid = getpid();
	printf("pid is %u\n", (unsigned) pid);
	tests_cat_pid(dir_name, "integck_test_dir_", pid);
	if (chdir(dir_name) != -1) {
		/* Remove it if it is already there */
		tests_clear_dir(".");
		CHECK(chdir("..") != -1);
		CHECK(rmdir(dir_name) != -1);
	}
	initial_free_space = tests_get_free_space();
	log10_initial_free_space = 0;
	for (z = initial_free_space; z >= 10; z /= 10)
		++log10_initial_free_space;
	top_dir = dir_new(NULL, dir_name);

	if (!top_dir)
		return;

	srand(pid);

	create_test_data();

	if (!tests_fs_is_rootfs()) {
		close_open_files();
		tests_remount(); /* Requires root access */
	}

	/* Check everything */
	dir_check(top_dir);
	check_deleted_files();

	for (rpt = 0; tests_repeat_parameter == 0 ||
				rpt < tests_repeat_parameter; ++rpt) {
		update_test_data();

		if (!tests_fs_is_rootfs()) {
			close_open_files();
			tests_remount(); /* Requires root access */
		}

		/* Check everything */
		dir_check(top_dir);
		check_deleted_files();
	}

	/* Tidy up by removing everything */
	close_open_files();
	tests_clear_dir(dir_name);
	CHECK(rmdir(dir_name) != -1);
}

/* Title of this test */

const char *integck_get_title(void)
{
	return "Test file system integrity";
}

/* Description of this test */

const char *integck_get_description(void)
{
	return
		"Create a directory named integck_test_dir_pid " \
		"where pid is the process id. " \
		"Randomly create and delete files and directories. " \
		"Randomly write to and truncate files. " \
		"Un-mount and re-mount test file " \
		"system (if it is not the root file system ). " \
		"Check data. Make more random changes. " \
		"Un-mount and re-mount again. Check again. " \
		"Repeat some number of times. "
		"The repeat count is set by the -n or --repeat option, " \
		"otherwise it defaults to 1. " \
		"A repeat count of zero repeats forever.";
}

int main(int argc, char *argv[])
{
	int run_test;

	/* Set default test repetition */
	tests_repeat_parameter = 1;

	/* Handle common arguments */
	run_test = tests_get_args(argc, argv, integck_get_title(),
			integck_get_description(), "n");
	if (!run_test)
		return 1;
	/* Change directory to the file system and check it is ok for testing */
	tests_check_test_file_system();
	/* Do the actual test */
	integck();
	return 0;
}