aboutsummaryrefslogtreecommitdiff
path: root/package/cramfs/cramfs-01-devtable.patch
blob: 884eb8cb83c1d48dbc70f2c7cecf8c9a13d422ae (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
--- cramfs-1.1.orig/cramfsck.c	2002-02-22 17:00:42.000000000 -0700
+++ cramfs-1.1/cramfsck.c	2002-12-21 01:25:17.000000000 -0700
@@ -51,10 +51,11 @@
 #include <utime.h>
 #include <sys/ioctl.h>
 #define _LINUX_STRING_H_
-#include <linux/fs.h>
-#include <linux/cramfs_fs.h>
+#include "linux/cramfs_fs.h"
 #include <zlib.h>
 
+#define BLKGETSIZE	_IO(0x12,96) /* return device size /512 (long *arg) */
+
 /* Exit codes used by fsck-type programs */
 #define FSCK_OK          0	/* No errors */
 #define FSCK_NONDESTRUCT 1	/* File system errors corrected */
@@ -75,7 +76,7 @@
 static int opt_verbose = 0;	/* 1 = verbose (-v), 2+ = very verbose (-vv) */
 #ifdef INCLUDE_FS_TESTS
 static int opt_extract = 0;		/* extract cramfs (-x) */
-static char *extract_dir = "root";	/* extraction directory (-x) */
+static char *extract_dir = "/";	/* extraction directory (-x) */
 static uid_t euid;			/* effective UID */
 
 /* (cramfs_super + start) <= start_dir < end_dir <= start_data <= end_data */
@@ -155,7 +156,7 @@
 	}
 
 	if (*length < sizeof(struct cramfs_super)) {
-		die(FSCK_UNCORRECTED, 0, "file length too short");
+		die(FSCK_UNCORRECTED, 0, "filesystem smaller than a cramfs superblock!");
 	}
 
 	/* find superblock */
@@ -190,7 +191,8 @@
 			die(FSCK_UNCORRECTED, 0, "zero file count");
 		}
 		if (*length < super.size) {
-			die(FSCK_UNCORRECTED, 0, "file length too short");
+			die(FSCK_UNCORRECTED, 0, "file length too short, %lu is smaller than %lu",
+				*length, super.size);
 		}
 		else if (*length > super.size) {
 			fprintf(stderr, "warning: file extends past end of filesystem\n");
@@ -267,11 +269,11 @@
 #ifdef INCLUDE_FS_TESTS
 static void print_node(char type, struct cramfs_inode *i, char *name)
 {
-	char info[10];
+	char info[11];
 
 	if (S_ISCHR(i->mode) || (S_ISBLK(i->mode))) {
 		/* major/minor numbers can be as high as 2^12 or 4096 */
-		snprintf(info, 10, "%4d,%4d", major(i->size), minor(i->size));
+		snprintf(info, 11, "%4d,%4d", major(i->size), minor(i->size));
 	}
 	else {
 		/* size be as high as 2^24 or 16777216 */
@@ -445,8 +447,10 @@
 	}
 	/* TODO: Do we need to check end_dir for empty case? */
 	memcpy(newpath, path, pathlen);
-	newpath[pathlen] = '/';
-	pathlen++;
+	if (pathlen > 1) {
+	    newpath[pathlen] = '/';
+	    pathlen++;
+	}
 	if (opt_verbose) {
 		print_node('d', i, path);
 	}
--- cramfs-1.1.orig/device_table.txt	1969-12-31 17:00:00.000000000 -0700
+++ cramfs-1.1/device_table.txt	2003-01-01 05:13:44.000000000 -0700
@@ -0,0 +1,129 @@
+# When building a target filesystem, it is desirable to not have to
+# become root and then run 'mknod' a thousand times.  Using a device 
+# table you can create device nodes and directories "on the fly".
+#
+# This is a sample device table file for use with mkcramfs.  You can
+# do all sorts of interesting things with a device table file.  For
+# example, if you want to adjust the permissions on a particular file
+# you can just add an entry like:
+#   /sbin/foobar	f	2755	0	0	-	-	-	-	-
+# and (assuming the file /sbin/foobar exists) it will be made setuid
+# root (regardless of what its permissions are on the host filesystem.
+# Furthermore, you can use a single table entry to create a many device
+# minors.  For example, if I wanted to create /dev/hda and /dev/hda[0-15]
+# I could just use the following two table entries:
+#   /dev/hda	b	640	0	0	3	0	0	0	-
+#   /dev/hda	b	640	0	0	3	1	1	1	15
+# 
+# Device table entries take the form of:
+# <name>    <type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
+# where name is the file name,  type can be one of: 
+#	f	A regular file
+#	d	Directory
+#	c	Character special device file
+#	b	Block special device file
+#	p	Fifo (named pipe)
+# uid is the user id for the target file, gid is the group id for the
+# target file.  The rest of the entries (major, minor, etc) apply only 
+# to device special files.
+
+# Have fun
+# -Erik Andersen <andersen@codepoet.org>
+#
+
+#<name>		<type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
+/dev		d	755	0	0	-	-	-	-	-
+/dev/mem	c	640	0	0	1	1	0	0	-
+/dev/kmem	c	640	0	0	1	2	0	0	-
+/dev/null	c	640	0	0	1	3	0	0	-
+/dev/zero	c	640	0	0	1	5	0	0	-
+/dev/random	c	640	0	0	1	8	0	0	-
+/dev/urandom	c	640	0	0	1	9	0	0	-
+/dev/tty	c	666	0	0	5	0	0	0	-
+/dev/tty	c	666	0	0	4	0	0	1	6
+/dev/console	c	640	0	0	5	1	0	0	-
+/dev/ram	b	640	0	0	1	1	0	0	-
+/dev/ram	b	640	0	0	1	0	0	1	4
+/dev/loop	b	640	0	0	7	0	0	1	2
+/dev/ptmx	c	666	0	0	5	2	0	0	-
+#/dev/ttyS	c	640	0	0	4	64	0	1	4
+#/dev/psaux	c	640	0	0	10	1	0	0	-
+#/dev/rtc	c	640	0	0	10	135	0	0	-
+
+# Adjust permissions on some normal files
+#/etc/shadow	f	600	0	0	-	-	-	-	-
+#/bin/tinylogin	f	4755	0	0	-	-	-	-	-
+
+# User-mode Linux stuff
+/dev/ubda	b	640	0	0	98	0	0	0	-
+/dev/ubda	b	640	0	0	98	1	1	1	15
+
+# IDE Devices
+/dev/hda	b	640	0	0	3	0	0	0	-
+/dev/hda	b	640	0	0	3	1	1	1	15
+/dev/hdb	b	640	0	0	3	64	0	0	-
+/dev/hdb	b	640	0	0	3	65	1	1	15
+#/dev/hdc	b	640	0	0	22	0	0	0	-
+#/dev/hdc	b	640	0	0	22	1	1	1	15
+#/dev/hdd	b	640	0	0	22	64	0	0	-
+#/dev/hdd	b	640	0	0	22	65	1	1	15
+#/dev/hde	b	640	0	0	33	0	0	0	-
+#/dev/hde	b	640	0	0	33	1	1	1	15
+#/dev/hdf	b	640	0	0	33	64	0	0	-
+#/dev/hdf	b	640	0	0	33	65	1	1	15
+#/dev/hdg	b	640	0	0	34	0	0	0	-
+#/dev/hdg	b	640	0	0	34	1	1	1	15
+#/dev/hdh	b	640	0	0	34	64	0	0	-
+#/dev/hdh	b	640	0	0	34	65	1	1	15
+
+# SCSI Devices
+#/dev/sda	b	640	0	0	8	0	0	0	-
+#/dev/sda	b	640	0	0	8	1	1	1	15
+#/dev/sdb	b	640	0	0	8	16	0	0	-
+#/dev/sdb	b	640	0	0	8	17	1	1	15
+#/dev/sdc	b	640	0	0	8	32	0	0	-
+#/dev/sdc	b	640	0	0	8	33	1	1	15
+#/dev/sdd	b	640	0	0	8	48	0	0	-
+#/dev/sdd	b	640	0	0	8	49	1	1	15
+#/dev/sde	b	640	0	0	8	64	0	0	-
+#/dev/sde	b	640	0	0	8	65	1	1	15
+#/dev/sdf	b	640	0	0	8	80	0	0	-
+#/dev/sdf	b	640	0	0	8	81	1	1	15
+#/dev/sdg	b	640	0	0	8	96	0	0	-
+#/dev/sdg	b	640	0	0	8	97	1	1	15
+#/dev/sdh	b	640	0	0	8	112	0	0	-
+#/dev/sdh	b	640	0	0	8	113	1	1	15
+#/dev/sg		c	640	0	0	21	0	0	1	15
+#/dev/scd	b	640	0	0	11	0	0	1	15
+#/dev/st		c	640	0	0	9	0	0	1	8
+#/dev/nst	c	640	0	0	9	128	0	1	8
+#/dev/st	c	640	0	0	9	32	1	1	4
+#/dev/st	c	640	0	0	9	64	1	1	4
+#/dev/st	c	640	0	0	9	96	1	1	4
+
+# Floppy disk devices
+#/dev/fd		b	640	0	0	2	0	0	1	2
+#/dev/fd0d360	b	640	0	0	2	4	0	0	-
+#/dev/fd1d360	b	640	0	0	2	5	0	0	-
+#/dev/fd0h1200	b	640	0	0	2	8	0	0	-
+#/dev/fd1h1200	b	640	0	0	2	9	0	0	-
+#/dev/fd0u1440	b	640	0	0	2	28	0	0	-
+#/dev/fd1u1440	b	640	0	0	2	29	0	0	-
+#/dev/fd0u2880	b	640	0	0	2	32	0	0	-
+#/dev/fd1u2880	b	640	0	0	2	33	0	0	-
+
+# All the proprietary cdrom devices in the world
+#/dev/aztcd	b	640	0	0	29	0	0	0	-
+#/dev/bpcd	b	640	0	0	41	0	0	0	-
+#/dev/capi20	c	640	0	0	68	0	0	1	2
+#/dev/cdu31a	b	640	0	0	15	0	0	0	-
+#/dev/cdu535	b	640	0	0	24	0	0	0	-
+#/dev/cm206cd	b	640	0	0	32	0	0	0	-
+#/dev/sjcd	b	640	0	0	18	0	0	0	-
+#/dev/sonycd	b	640	0	0	15	0	0	0	-
+#/dev/gscd	b	640	0	0	16	0	0	0	-
+#/dev/sbpcd	b	640	0	0	25	0	0	0	-
+#/dev/sbpcd	b	640	0	0	25	0	0	1	4
+#/dev/mcd	b	640	0	0	23	0	0	0	-
+#/dev/optcd	b	640	0	0	17	0	0	0	-
+
--- cramfs-1.1.orig/mkcramfs.c	2002-02-20 01:03:32.000000000 -0700
+++ cramfs-1.1/mkcramfs.c	2002-12-21 01:25:17.000000000 -0700
@@ -1,3 +1,4 @@
+/* vi: set sw=8 ts=8: */
 /*
  * mkcramfs - make a cramfs file system
  *
@@ -16,12 +17,21 @@
  * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Added device table support (code taken from mkfs.jffs2.c, credit to
+ * Erik Andersen <andersen@codepoet.org>) as well as an option to squash
+ * permissions. - Russ Dill <Russ.Dill@asu.edu> September 2002
+ *
+ * Reworked, cleaned up, and updated for cramfs-1.1, December 2002
+ *  - Erik Andersen <andersen@codepoet.org>
+ *
  */
 
 /*
  * If you change the disk format of cramfs, please update fs/cramfs/README.
  */
 
+#define _GNU_SOURCE
 #include <sys/types.h>
 #include <stdio.h>
 #include <sys/stat.h>
@@ -33,8 +43,15 @@
 #include <errno.h>
 #include <string.h>
 #include <stdarg.h>
+#include <libgen.h>
+#include <ctype.h>
+#include <assert.h>
+#include <getopt.h>
 #include <linux/cramfs_fs.h>
 #include <zlib.h>
+#ifdef DMALLOC
+#include <dmalloc.h>
+#endif
 
 /* Exit codes used by mkfs-type programs */
 #define MKFS_OK          0	/* No errors */
@@ -71,11 +88,17 @@
 		  + (1 << CRAMFS_SIZE_WIDTH) - 1 /* filesize */ \
 		  + (1 << CRAMFS_SIZE_WIDTH) * 4 / PAGE_CACHE_SIZE /* block pointers */ )
 
+
+/* The kernel assumes PAGE_CACHE_SIZE as block size. */
+#define PAGE_CACHE_SIZE (4096)
+
+
 static const char *progname = "mkcramfs";
 static unsigned int blksize = PAGE_CACHE_SIZE;
 static long total_blocks = 0, total_nodes = 1; /* pre-count the root node */
 static int image_length = 0;
 
+
 /*
  * If opt_holes is set, then mkcramfs can create explicit holes in the
  * data, which saves 26 bytes per hole (which is a lot smaller a
@@ -91,10 +114,12 @@
 static int opt_holes = 0;
 static int opt_pad = 0;
 static int opt_verbose = 0;
+static int opt_squash = 0;
 static char *opt_image = NULL;
 static char *opt_name = NULL;
 
 static int warn_dev, warn_gid, warn_namelen, warn_skip, warn_size, warn_uid;
+static const char *const memory_exhausted = "memory exhausted";
 
 /* In-core version of inode / directory entry. */
 struct entry {
@@ -123,7 +148,7 @@
 {
 	FILE *stream = status ? stderr : stdout;
 
-	fprintf(stream, "usage: %s [-h] [-e edition] [-i file] [-n name] dirname outfile\n"
+	fprintf(stream, "usage: %s [-h] [-e edition] [-i file] [-n name] [-D file] dirname outfile\n"
 		" -h         print this help\n"
 		" -E         make all warnings errors (non-zero exit status)\n"
 		" -e edition set edition number (part of fsid)\n"
@@ -133,39 +158,157 @@
 		" -s         sort directory entries (old option, ignored)\n"
 		" -v         be more verbose\n"
 		" -z         make explicit holes (requires >= 2.3.39)\n"
-		" dirname    root of the directory tree to be compressed\n"
+		" -D         Use the named FILE as a device table file\n"
+		" -q         squash permissions (make everything owned by root)\n"
+		" dirname    root of the filesystem to be compressed\n"
 		" outfile    output file\n", progname, PAD_SIZE);
 
 	exit(status);
 }
 
-static void die(int status, int syserr, const char *fmt, ...)
+static void verror_msg(const char *s, va_list p)
+{
+	fflush(stdout);
+	fprintf(stderr, "mkcramfs: ");
+	vfprintf(stderr, s, p);
+}
+
+static void vperror_msg(const char *s, va_list p)
+{
+	int err = errno;
+
+	if (s == 0)
+		s = "";
+	verror_msg(s, p);
+	if (*s)
+		s = ": ";
+	fprintf(stderr, "%s%s\n", s, strerror(err));
+}
+
+static void perror_msg(const char *s, ...)
+{
+	va_list p;
+
+	va_start(p, s);
+	vperror_msg(s, p);
+	va_end(p);
+}
+
+static void error_msg_and_die(const char *s, ...)
+{
+	va_list p;
+
+	va_start(p, s);
+	verror_msg(s, p);
+	va_end(p);
+	putc('\n', stderr);
+	exit(MKFS_ERROR);
+}
+
+static void perror_msg_and_die(const char *s, ...)
+{
+	va_list p;
+
+	va_start(p, s);
+	vperror_msg(s, p);
+	va_end(p);
+	exit(MKFS_ERROR);
+}
+#ifndef DMALLOC
+extern char *xstrdup(const char *s)
+{
+	char *t;
+
+	if (s == NULL)
+		return NULL;
+	t = strdup(s);
+	if (t == NULL)
+		error_msg_and_die(memory_exhausted);
+	return t;
+}
+
+extern void *xmalloc(size_t size)
+{
+	void *ptr = malloc(size);
+
+	if (ptr == NULL && size != 0)
+		error_msg_and_die(memory_exhausted);
+	return ptr;
+}
+
+extern void *xcalloc(size_t nmemb, size_t size)
+{
+	void *ptr = calloc(nmemb, size);
+
+	if (ptr == NULL && nmemb != 0 && size != 0)
+		error_msg_and_die(memory_exhausted);
+	return ptr;
+}
+
+extern void *xrealloc(void *ptr, size_t size)
+{
+	ptr = realloc(ptr, size);
+	if (ptr == NULL && size != 0)
+		error_msg_and_die(memory_exhausted);
+	return ptr;
+}
+#endif
+
+static FILE *xfopen(const char *path, const char *mode)
 {
-	va_list arg_ptr;
-	int save = errno;
+	FILE *fp;
+
+	if ((fp = fopen(path, mode)) == NULL)
+		perror_msg_and_die("%s", path);
+	return fp;
+}
 
-	fflush(0);
-	va_start(arg_ptr, fmt);
-	fprintf(stderr, "%s: ", progname);
-	vfprintf(stderr, fmt, arg_ptr);
-	if (syserr) {
-		fprintf(stderr, ": %s", strerror(save));
+extern int xopen(const char *pathname, int flags, mode_t mode)
+{
+	int ret;
+	
+	if (flags & O_CREAT)
+		ret = open(pathname, flags, mode);
+	else
+		ret = open(pathname, flags);
+	if (ret == -1) {
+		perror_msg_and_die("%s", pathname);
 	}
-	fprintf(stderr, "\n");
-	va_end(arg_ptr);
-	exit(status);
+	return ret;
 }
 
+extern char *xreadlink(const char *path)
+{                       
+	static const int GROWBY = 80; /* how large we will grow strings by */
+
+	char *buf = NULL;   
+	int bufsize = 0, readsize = 0;
+
+	do {
+		buf = xrealloc(buf, bufsize += GROWBY);
+		readsize = readlink(path, buf, bufsize); /* 1st try */
+		if (readsize == -1) {
+		    perror_msg("%s:%s", progname, path);
+		    return NULL;
+		}
+	}           
+	while (bufsize < readsize + 1);
+
+	buf[readsize] = '\0';
+
+	return buf;
+}       
+
 static void map_entry(struct entry *entry)
 {
 	if (entry->path) {
 		entry->fd = open(entry->path, O_RDONLY);
 		if (entry->fd < 0) {
-			die(MKFS_ERROR, 1, "open failed: %s", entry->path);
+			error_msg_and_die("open failed: %s", entry->path);
 		}
 		entry->uncompressed = mmap(NULL, entry->size, PROT_READ, MAP_PRIVATE, entry->fd, 0);
 		if (entry->uncompressed == MAP_FAILED) {
-			die(MKFS_ERROR, 1, "mmap failed: %s", entry->path);
+			error_msg_and_die("mmap failed: %s", entry->path);
 		}
 	}
 }
@@ -174,8 +317,9 @@
 {
 	if (entry->path) {
 		if (munmap(entry->uncompressed, entry->size) < 0) {
-			die(MKFS_ERROR, 1, "munmap failed: %s", entry->path);
+			error_msg_and_die("munmap failed: %s", entry->path);
 		}
+		entry->uncompressed=NULL;
 		close(entry->fd);
 	}
 }
@@ -204,7 +348,8 @@
 		find_identical_file(orig->next, newfile));
 }
 
-static void eliminate_doubles(struct entry *root, struct entry *orig) {
+static void eliminate_doubles(struct entry *root, struct entry *orig) 
+{
 	if (orig) {
 		if (orig->size && (orig->path || orig->uncompressed))
 			find_identical_file(root, orig);
@@ -232,10 +377,7 @@
 
 	/* Set up the path. */
 	/* TODO: Reuse the parent's buffer to save memcpy'ing and duplication. */
-	path = malloc(len + 1 + MAX_INPUT_NAMELEN + 1);
-	if (!path) {
-		die(MKFS_ERROR, 1, "malloc failed");
-	}
+	path = xmalloc(len + 1 + MAX_INPUT_NAMELEN + 1);
 	memcpy(path, name, len);
 	endpath = path + len;
 	*endpath = '/';
@@ -245,7 +387,7 @@
 	dircount = scandir(name, &dirlist, 0, cramsort);
 
 	if (dircount < 0) {
-		die(MKFS_ERROR, 1, "scandir failed: %s", name);
+		error_msg_and_die("scandir failed: %s", name);
 	}
 
 	/* process directory */
@@ -269,25 +411,20 @@
 		}
 		namelen = strlen(dirent->d_name);
 		if (namelen > MAX_INPUT_NAMELEN) {
-			die(MKFS_ERROR, 0,
-				"very long (%u bytes) filename found: %s\n"
-				"please increase MAX_INPUT_NAMELEN in mkcramfs.c and recompile",
+			error_msg_and_die(
+				"Very long (%u bytes) filename `%s' found.\n"
+				" Please increase MAX_INPUT_NAMELEN in mkcramfs.c and recompile.  Exiting.\n",
 				namelen, dirent->d_name);
 		}
 		memcpy(endpath, dirent->d_name, namelen + 1);
 
 		if (lstat(path, &st) < 0) {
+			perror(endpath);
 			warn_skip = 1;
 			continue;
 		}
-		entry = calloc(1, sizeof(struct entry));
-		if (!entry) {
-			die(MKFS_ERROR, 1, "calloc failed");
-		}
-		entry->name = strdup(dirent->d_name);
-		if (!entry->name) {
-			die(MKFS_ERROR, 1, "strdup failed");
-		}
+		entry = xcalloc(1, sizeof(struct entry));
+		entry->name = xstrdup(dirent->d_name);
 		/* truncate multi-byte UTF-8 filenames on character boundary */
 		if (namelen > CRAMFS_MAXPATHLEN) {
 			namelen = CRAMFS_MAXPATHLEN;
@@ -297,24 +434,25 @@
 				namelen--;
 				/* are we reasonably certain it was UTF-8 ? */
 				if (entry->name[namelen] < 0x80 || !namelen) {
-					die(MKFS_ERROR, 0, "cannot truncate filenames not encoded in UTF-8");
+					error_msg_and_die("cannot truncate filenames not encoded in UTF-8");
 				}
 			}
 			entry->name[namelen] = '\0';
 		}
 		entry->mode = st.st_mode;
 		entry->size = st.st_size;
-		entry->uid = st.st_uid;
+		entry->uid = opt_squash ? 0 : st.st_uid;
 		if (entry->uid >= 1 << CRAMFS_UID_WIDTH)
 			warn_uid = 1;
-		entry->gid = st.st_gid;
-		if (entry->gid >= 1 << CRAMFS_GID_WIDTH)
+		entry->gid = opt_squash ? 0 : st.st_gid;
+		if (entry->gid >= 1 << CRAMFS_GID_WIDTH) {
 			/* TODO: We ought to replace with a default
 			   gid instead of truncating; otherwise there
 			   are security problems.  Maybe mode should
 			   be &= ~070.  Same goes for uid once Linux
 			   supports >16-bit uids. */
 			warn_gid = 1;
+		}
 		size = sizeof(struct cramfs_inode) + ((namelen + 3) & ~3);
 		*fslen_ub += size;
 		if (S_ISDIR(st.st_mode)) {
@@ -325,21 +463,15 @@
 					warn_skip = 1;
 					continue;
 				}
-				entry->path = strdup(path);
-				if (!entry->path) {
-					die(MKFS_ERROR, 1, "strdup failed");
-				}
+				entry->path = xstrdup(path);
 				if ((entry->size >= 1 << CRAMFS_SIZE_WIDTH)) {
 					warn_size = 1;
 					entry->size = (1 << CRAMFS_SIZE_WIDTH) - 1;
 				}
 			}
 		} else if (S_ISLNK(st.st_mode)) {
-			entry->uncompressed = malloc(entry->size);
+			entry->uncompressed = xreadlink(path);
 			if (!entry->uncompressed) {
-				die(MKFS_ERROR, 1, "malloc failed");
-			}
-			if (readlink(path, entry->uncompressed, entry->size) < 0) {
 				warn_skip = 1;
 				continue;
 			}
@@ -351,7 +483,7 @@
 			if (entry->size & -(1<<CRAMFS_SIZE_WIDTH))
 				warn_dev = 1;
 		} else {
-			die(MKFS_ERROR, 0, "bogus file type: %s", entry->name);
+			error_msg_and_die("bogus file type: %s", entry->name);
 		}
 
 		if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
@@ -378,7 +510,9 @@
 	struct cramfs_super *super = (struct cramfs_super *) base;
 	unsigned int offset = sizeof(struct cramfs_super) + image_length;
 
-	offset += opt_pad;	/* 0 if no padding */
+	if (opt_pad) {
+		offset += opt_pad;	/* 0 if no padding */
+	}
 
 	super->magic = CRAMFS_MAGIC;
 	super->flags = CRAMFS_FLAG_FSID_VERSION_2 | CRAMFS_FLAG_SORTED_DIRS;
@@ -414,10 +548,10 @@
 	struct cramfs_inode *inode = (struct cramfs_inode *) (base + entry->dir_offset);
 
 	if ((offset & 3) != 0) {
-		die(MKFS_ERROR, 0, "illegal offset of %lu bytes", offset);
+		error_msg_and_die("illegal offset of %lu bytes", offset);
 	}
 	if (offset >= (1 << (2 + CRAMFS_OFFSET_WIDTH))) {
-		die(MKFS_ERROR, 0, "filesystem too big");
+		error_msg_and_die("filesystem too big");
 	}
 	inode->offset = (offset >> 2);
 }
@@ -429,7 +563,7 @@
  */
 static void print_node(struct entry *e)
 {
-	char info[10];
+	char info[12];
 	char type = '?';
 
 	if (S_ISREG(e->mode)) type = 'f';
@@ -442,11 +576,11 @@
 
 	if (S_ISCHR(e->mode) || (S_ISBLK(e->mode))) {
 		/* major/minor numbers can be as high as 2^12 or 4096 */
-		snprintf(info, 10, "%4d,%4d", major(e->size), minor(e->size));
+		snprintf(info, 11, "%4d,%4d", major(e->size), minor(e->size));
 	}
 	else {
 		/* size be as high as 2^24 or 16777216 */
-		snprintf(info, 10, "%9d", e->size);
+		snprintf(info, 11, "%9d", e->size);
 	}
 
 	printf("%c %04o %s %5d:%-3d %s\n",
@@ -462,17 +596,9 @@
 {
 	int stack_entries = 0;
 	int stack_size = 64;
-	struct entry **entry_stack;
-
-	entry_stack = malloc(stack_size * sizeof(struct entry *));
-	if (!entry_stack) {
-		die(MKFS_ERROR, 1, "malloc failed");
-	}
-
-	if (opt_verbose) {
-		printf("root:\n");
-	}
+	struct entry **entry_stack = NULL;
 
+	entry_stack = xmalloc(stack_size * sizeof(struct entry *));
 	for (;;) {
 		int dir_start = stack_entries;
 		while (entry) {
@@ -506,10 +632,7 @@
 			if (entry->child) {
 				if (stack_entries >= stack_size) {
 					stack_size *= 2;
-					entry_stack = realloc(entry_stack, stack_size * sizeof(struct entry *));
-					if (!entry_stack) {
-						die(MKFS_ERROR, 1, "realloc failed");
-					}
+					entry_stack = xrealloc(entry_stack, stack_size * sizeof(struct entry *));
 				}
 				entry_stack[stack_entries] = entry;
 				stack_entries++;
@@ -543,7 +666,7 @@
 
 		set_data_offset(entry, base, offset);
 		if (opt_verbose) {
-			printf("%s:\n", entry->name);
+		    printf("'%s':\n", entry->name);
 		}
 		entry = entry->child;
 	}
@@ -553,16 +676,21 @@
 
 static int is_zero(char const *begin, unsigned len)
 {
-	/* Returns non-zero iff the first LEN bytes from BEGIN are all NULs. */
-	return (len-- == 0 ||
-		(begin[0] == '\0' &&
-		 (len-- == 0 ||
-		  (begin[1] == '\0' &&
-		   (len-- == 0 ||
-		    (begin[2] == '\0' &&
-		     (len-- == 0 ||
-		      (begin[3] == '\0' &&
-		       memcmp(begin, begin + 4, len) == 0))))))));
+	if (opt_holes)
+		/* Returns non-zero iff the first LEN bytes from BEGIN are
+		   all NULs. */
+		return (len-- == 0 ||
+			(begin[0] == '\0' &&
+			 (len-- == 0 ||
+			  (begin[1] == '\0' &&
+			   (len-- == 0 ||
+			    (begin[2] == '\0' &&
+			     (len-- == 0 ||
+			      (begin[3] == '\0' &&
+			       memcmp(begin, begin + 4, len) == 0))))))));
+	else
+		/* Never create holes. */
+		return 0;
 }
 
 /*
@@ -575,37 +703,34 @@
  * Note that size > 0, as a zero-sized file wouldn't ever
  * have gotten here in the first place.
  */
-static unsigned int do_compress(char *base, unsigned int offset, char const *name, char *uncompressed, unsigned int size)
+static unsigned int do_compress(char *base, unsigned int offset, struct entry *entry)
 {
+	unsigned int size = entry->size;
 	unsigned long original_size = size;
 	unsigned long original_offset = offset;
 	unsigned long new_size;
 	unsigned long blocks = (size - 1) / blksize + 1;
 	unsigned long curr = offset + 4 * blocks;
 	int change;
+	char *uncompressed = entry->uncompressed;
 
-	total_blocks += blocks;
+	total_blocks += blocks; 
 
 	do {
 		unsigned long len = 2 * blksize;
 		unsigned int input = size;
-		int err;
-
 		if (input > blksize)
 			input = blksize;
 		size -= input;
-		if (!(opt_holes && is_zero (uncompressed, input))) {
-			err = compress2(base + curr, &len, uncompressed, input, Z_BEST_COMPRESSION);
-			if (err != Z_OK) {
-				die(MKFS_ERROR, 0, "compression error: %s", zError(err));
-			}
+		if (!is_zero (uncompressed, input)) {
+			compress(base + curr, &len, uncompressed, input);
 			curr += len;
 		}
 		uncompressed += input;
 
 		if (len > blksize*2) {
 			/* (I don't think this can happen with zlib.) */
-			die(MKFS_ERROR, 0, "AIEEE: block \"compressed\" to > 2*blocklength (%ld)", len);
+			error_msg_and_die("AIEEE: block \"compressed\" to > 2*blocklength (%ld)\n", len);
 		}
 
 		*(u32 *) (base + offset) = curr;
@@ -618,10 +743,12 @@
 	   st_blocks * 512.  But if you say that then perhaps
 	   administrative data should also be included in both. */
 	change = new_size - original_size;
-	if (opt_verbose > 1) {
-		printf("%6.2f%% (%+d bytes)\t%s\n",
-		       (change * 100) / (double) original_size, change, name);
+#if 0
+	if (opt_verbose) {
+	    printf("%6.2f%% (%+d bytes)\t%s\n",
+		    (change * 100) / (double) original_size, change, entry->name);
 	}
+#endif
 
 	return curr;
 }
@@ -644,7 +771,7 @@
 				set_data_offset(entry, base, offset);
 				entry->offset = offset;
 				map_entry(entry);
-				offset = do_compress(base, offset, entry->name, entry->uncompressed, entry->size);
+				offset = do_compress(base, offset, entry);
 				unmap_entry(entry);
 			}
 		}
@@ -660,13 +787,10 @@
 	int fd;
 	char *buf;
 
-	fd = open(file, O_RDONLY);
-	if (fd < 0) {
-		die(MKFS_ERROR, 1, "open failed: %s", file);
-	}
+	fd = xopen(file, O_RDONLY, 0);
 	buf = mmap(NULL, image_length, PROT_READ, MAP_PRIVATE, fd, 0);
 	if (buf == MAP_FAILED) {
-		die(MKFS_ERROR, 1, "mmap failed");
+		error_msg_and_die("mmap failed");
 	}
 	memcpy(base + offset, buf, image_length);
 	munmap(buf, image_length);
@@ -679,6 +803,328 @@
 	return (offset + image_length);
 }
 
+static struct entry *find_filesystem_entry(struct entry *dir, char *name, mode_t type)
+{
+	struct entry *e = dir;
+
+	if (S_ISDIR(dir->mode)) {
+		e = dir->child;
+	}
+	while (e) {
+		/* Only bother to do the expensive strcmp on matching file types */
+		if (type == (e->mode & S_IFMT) && e->name) {
+			if (S_ISDIR(e->mode)) {
+				int len = strlen(e->name);
+
+				/* Check if we are a parent of the correct path */
+				if (strncmp(e->name, name, len) == 0) {
+					/* Is this an _exact_ match? */
+					if (strcmp(name, e->name) == 0) {
+						return (e);
+					}
+					/* Looks like we found a parent of the correct path */
+					if (name[len] == '/') {
+						if (e->child) {
+							return (find_filesystem_entry (e, name + len + 1, type));
+						} else {
+							return NULL;
+						}
+					}
+				}
+			} else {
+				if (strcmp(name, e->name) == 0) {
+					return (e);
+				}
+			}
+		}
+		e = e->next;
+	}
+	return (NULL);
+}
+
+void modify_entry(char *full_path, unsigned long uid, unsigned long gid, 
+	unsigned long mode, unsigned long rdev, struct entry *root, loff_t *fslen_ub)
+{
+	char *name, *path, *full;
+	struct entry *curr, *parent, *entry, *prev;
+	
+	full = xstrdup(full_path);
+	path = xstrdup(dirname(full));
+	name = full_path + strlen(path) + 1;
+	free(full);
+	if (strcmp(path, "/") == 0) {
+		parent = root;
+		name = full_path + 1;
+	} else {
+		if (!(parent = find_filesystem_entry(root, path+1, S_IFDIR)))
+			error_msg_and_die("%s/%s: could not find parent\n", path, name);
+	}
+	if ((entry = find_filesystem_entry(parent, name, (mode & S_IFMT)))) {
+		/* its there, just modify permissions */
+		entry->mode = mode;
+		entry->uid = uid;
+		entry->gid = gid;
+	} else { /* make a new entry */
+	
+		/* code partially replicated from parse_directory() */
+		size_t namelen;
+		if (S_ISREG(mode)) {
+			error_msg_and_die("%s: regular file from device_table file must exist on disk!", full_path);
+		}
+
+		namelen = strlen(name);
+		if (namelen > MAX_INPUT_NAMELEN) {
+			error_msg_and_die(
+				"Very long (%u bytes) filename `%s' found.\n"
+				" Please increase MAX_INPUT_NAMELEN in mkcramfs.c and recompile.  Exiting.\n",
+				namelen, name);
+		}
+		entry = xcalloc(1, sizeof(struct entry));
+		entry->name = xstrdup(name);
+		/* truncate multi-byte UTF-8 filenames on character boundary */
+		if (namelen > CRAMFS_MAXPATHLEN) {
+			namelen = CRAMFS_MAXPATHLEN;
+			warn_namelen = 1;
+			/* the first lost byte must not be a trail byte */
+			while ((entry->name[namelen] & 0xc0) == 0x80) {
+				namelen--;
+				/* are we reasonably certain it was UTF-8 ? */
+				if (entry->name[namelen] < 0x80 || !namelen) {
+					error_msg_and_die("cannot truncate filenames not encoded in UTF-8");
+				}
+			}
+			entry->name[namelen] = '\0';
+		}
+		entry->mode = mode;
+		entry->uid = uid;
+		entry->gid = gid;
+		entry->size = 0;
+		if (S_ISBLK(mode) || S_ISCHR(mode)) {
+			entry->size = rdev;
+			if (entry->size & -(1<<CRAMFS_SIZE_WIDTH))
+				warn_dev = 1;
+		}
+		
+		/* ok, now we have to backup and correct the size of all the entries above us */
+		*fslen_ub += sizeof(struct cramfs_inode) + ((namelen + 3) & ~3);
+		parent->size += sizeof(struct cramfs_inode) + ((namelen + 3) & ~3);
+
+		/* alright, time to link us in */
+		curr = parent->child;
+		prev = NULL;
+		while (curr && strcmp(name, curr->name) > 0) {
+			prev = curr;
+			curr = curr->next;
+		}
+		if (!prev) parent->child = entry;
+		else prev->next = entry;
+		entry->next = curr;
+		entry->child = NULL;
+	}
+	if (entry->uid >= 1 << CRAMFS_UID_WIDTH)
+		warn_uid = 1;
+	if (entry->gid >= 1 << CRAMFS_GID_WIDTH) {
+		/* TODO: We ought to replace with a default
+		   gid instead of truncating; otherwise there
+		   are security problems.  Maybe mode should
+		   be &= ~070.  Same goes for uid once Linux
+		   supports >16-bit uids. */
+		warn_gid = 1;
+	}
+	free(path);
+}
+
+/* the GNU C library has a wonderful scanf("%as", string) which will
+ allocate the string with the right size, good to avoid buffer overruns. 
+ the following macros use it if available or use a hacky workaround...
+ */
+
+#ifdef __GNUC__
+#define SCANF_PREFIX "a"
+#define SCANF_STRING(s) (&s)
+#define GETCWD_SIZE 0
+#else
+#define SCANF_PREFIX "511"
+#define SCANF_STRING(s) (s = xmalloc(512))
+#define GETCWD_SIZE -1
+inline int snprintf(char *str, size_t n, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+
+	va_start(ap, fmt);
+	ret = vsprintf(str, fmt, ap);
+	va_end(ap);
+	return ret;
+}
+#endif
+
+/*  device table entries take the form of:
+    <path>	<type> <mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
+    /dev/mem     c    640       0       0         1       1       0     0         -
+
+    type can be one of: 
+	f	A regular file
+	d	Directory
+	c	Character special device file
+	b	Block special device file
+	p	Fifo (named pipe)
+
+    I don't bother with symlinks (permissions are irrelevant), hard
+    links (special cases of regular files), or sockets (why bother).
+
+    Regular files must exist in the target root directory.  If a char,
+    block, fifo, or directory does not exist, it will be created.
+*/
+
+static int interpret_table_entry(char *line, struct entry *root, loff_t *fslen_ub)
+{
+	char type, *name = NULL;
+	unsigned long mode = 0755, uid = 0, gid = 0, major = 0, minor = 0;
+	unsigned long start = 0, increment = 1, count = 0;
+
+	if (sscanf (line, "%" SCANF_PREFIX "s %c %lo %lu %lu %lu %lu %lu %lu %lu",
+		 SCANF_STRING(name), &type, &mode, &uid, &gid, &major, &minor,
+		 &start, &increment, &count) < 0) 
+	{
+		return 1;
+	}
+
+	if (!strcmp(name, "/")) {
+		error_msg_and_die("Device table entries require absolute paths");
+	}
+
+	switch (type) {
+	case 'd':
+		mode |= S_IFDIR;
+		modify_entry(name, uid, gid, mode, 0, root, fslen_ub);
+		break;
+	case 'f':
+		mode |= S_IFREG;
+		modify_entry(name, uid, gid, mode, 0, root, fslen_ub);
+		break;
+	case 'p':
+		mode |= S_IFIFO;
+		modify_entry(name, uid, gid, mode, 0, root, fslen_ub);
+		break;
+	case 'c':
+	case 'b':
+		mode |= (type == 'c') ? S_IFCHR : S_IFBLK;
+		if (count > 0) {
+			char *buf;
+			unsigned long i;
+			dev_t rdev;
+
+			for (i = start; i < count; i++) {
+				asprintf(&buf, "%s%lu", name, i);
+				rdev = makedev(major, minor + (i * increment - start));
+				modify_entry(buf, uid, gid, mode, rdev, root, fslen_ub);
+				free(buf);
+			}
+		} else {
+			dev_t rdev = makedev(major, minor);
+			modify_entry(name, uid, gid, mode, rdev, root, fslen_ub);
+		}
+		break;
+	default:
+		error_msg_and_die("Unsupported file type");
+	}
+	free(name);
+	return 0;
+}
+
+static int parse_device_table(FILE *file, struct entry *root, loff_t *fslen_ub)
+{
+	char *line;
+	int status = 0;
+	size_t length = 0;
+
+	/* Turn off squash, since we must ensure that values
+	 * entered via the device table are not squashed */
+	opt_squash = 0;
+
+	/* Looks ok so far.  The general plan now is to read in one
+	 * line at a time, check for leading comment delimiters ('#'),
+	 * then try and parse the line as a device table.  If we fail
+	 * to parse things, try and help the poor fool to fix their
+	 * device table with a useful error msg... */
+	line = NULL;
+	while (getline(&line, &length, file) != -1) {
+		/* First trim off any whitespace */
+		int len = strlen(line);
+
+		/* trim trailing whitespace */
+		while (len > 0 && isspace(line[len - 1]))
+			line[--len] = '\0';
+		/* trim leading whitespace */
+		memmove(line, &line[strspn(line, " \n\r\t\v")], len);
+
+		/* How long are we after trimming? */
+		len = strlen(line);
+
+		/* If this is NOT a comment line, try to interpret it */
+		if (len && *line != '#') {
+			if (interpret_table_entry(line, root, fslen_ub))
+				status = 1;
+		}
+
+		free(line);
+		line = NULL;
+	}
+	free(line);
+	fclose(file);
+
+	return status;
+}
+
+void traverse(struct entry *entry, int depth)
+{
+	struct entry *curr = entry;
+	int i;
+
+	while (curr) {
+		for (i = 0; i < depth; i++) putchar(' ');
+		printf("%s: size=%d mode=%d same=%p\n",
+			(curr->name)? (char*)curr->name : "/", 
+			curr->size, curr->mode, curr->same);
+		if (curr->child) traverse(curr->child, depth + 4);
+		curr = curr->next;
+	}
+}
+
+static void free_filesystem_entry(struct entry *dir)
+{
+	struct entry *e = dir, *last;
+
+	if (S_ISDIR(dir->mode)) {
+		e = dir->child;
+	}
+	while (e) {
+		if (e->name)
+			free(e->name);
+		if (e->path)
+			free(e->path);
+		if (e->uncompressed)
+			free(e->uncompressed);
+		last = e;
+		if (e->child) {
+			free_filesystem_entry(e);
+		}
+		e = e->next;
+		free(last);
+	}
+}
+
+
+/*
+ * Usage:
+ *
+ *      mkcramfs directory-name outfile
+ *
+ * where "directory-name" is simply the root of the directory
+ * tree that we want to generate a compressed filesystem out
+ * of.
+ */
 int main(int argc, char **argv)
 {
 	struct stat st;		/* used twice... */
@@ -692,6 +1138,7 @@
 	u32 crc;
 	int c;			/* for getopt */
 	char *ep;		/* for strtoul */
+	FILE *devtable = NULL;
 
 	total_blocks = 0;
 
@@ -699,7 +1146,7 @@
 		progname = argv[0];
 
 	/* command line options */
-	while ((c = getopt(argc, argv, "hEe:i:n:psvz")) != EOF) {
+	while ((c = getopt(argc, argv, "hEe:i:n:psvzD:q")) != EOF) {
 		switch (c) {
 		case 'h':
 			usage(MKFS_OK);
@@ -715,7 +1162,7 @@
 		case 'i':
 			opt_image = optarg;
 			if (lstat(opt_image, &st) < 0) {
-				die(MKFS_ERROR, 1, "lstat failed: %s", opt_image);
+				error_msg_and_die("lstat failed: %s", opt_image);
 			}
 			image_length = st.st_size; /* may be padded later */
 			fslen_ub += (image_length + 3); /* 3 is for padding */
@@ -736,6 +1183,16 @@
 		case 'z':
 			opt_holes = 1;
 			break;
+		case 'q':
+			opt_squash = 1;
+			break;
+		case 'D':
+			devtable = xfopen(optarg, "r");
+			if (fstat(fileno(devtable), &st) < 0)
+				perror_msg_and_die(optarg);
+			if (st.st_size < 10)
+				error_msg_and_die("%s: not a proper device table file\n", optarg);
+			break;
 		}
 	}
 
@@ -745,25 +1202,23 @@
 	outfile = argv[optind + 1];
 
 	if (stat(dirname, &st) < 0) {
-		die(MKFS_USAGE, 1, "stat failed: %s", dirname);
-	}
-	fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
-	if (fd < 0) {
-		die(MKFS_USAGE, 1, "open failed: %s", outfile);
+		error_msg_and_die("stat failed: %s", dirname);
 	}
+	fd = xopen(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
 
-	root_entry = calloc(1, sizeof(struct entry));
-	if (!root_entry) {
-		die(MKFS_ERROR, 1, "calloc failed");
-	}
+	root_entry = xcalloc(1, sizeof(struct entry));
 	root_entry->mode = st.st_mode;
 	root_entry->uid = st.st_uid;
 	root_entry->gid = st.st_gid;
 
 	root_entry->size = parse_directory(root_entry, dirname, &root_entry->child, &fslen_ub);
 
+	if (devtable) {
+		parse_device_table(devtable, root_entry, &fslen_ub);
+	}
+
 	/* always allocate a multiple of blksize bytes because that's
-	   what we're going to write later on */
+           what we're going to write later on */
 	fslen_ub = ((fslen_ub - 1) | (blksize - 1)) + 1;
 
 	if (fslen_ub > MAXFSLEN) {
@@ -790,7 +1245,7 @@
 	rom_image = mmap(NULL, fslen_ub?fslen_ub:1, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 
 	if (rom_image == MAP_FAILED) {
-		die(MKFS_ERROR, 1, "mmap failed");
+		error_msg_and_die("mmap failed");
 	}
 
 	/* Skip the first opt_pad bytes for boot loader code */
@@ -807,6 +1262,7 @@
 	}
 
 	offset = write_directory_structure(root_entry->child, rom_image, offset);
+	if (opt_verbose)
 	printf("Directory data: %d bytes\n", offset);
 
 	offset = write_data(root_entry, rom_image, offset);
@@ -814,30 +1270,38 @@
 	/* We always write a multiple of blksize bytes, so that
 	   losetup works. */
 	offset = ((offset - 1) | (blksize - 1)) + 1;
+	if (opt_verbose)
 	printf("Everything: %d kilobytes\n", offset >> 10);
 
 	/* Write the superblock now that we can fill in all of the fields. */
 	write_superblock(root_entry, rom_image+opt_pad, offset);
+	if (opt_verbose)
 	printf("Super block: %d bytes\n", sizeof(struct cramfs_super));
 
 	/* Put the checksum in. */
 	crc = crc32(0L, Z_NULL, 0);
 	crc = crc32(crc, (rom_image+opt_pad), (offset-opt_pad));
 	((struct cramfs_super *) (rom_image+opt_pad))->fsid.crc = crc;
+	if (opt_verbose)
 	printf("CRC: %x\n", crc);
 
 	/* Check to make sure we allocated enough space. */
 	if (fslen_ub < offset) {
-		die(MKFS_ERROR, 0, "not enough space allocated for ROM image (%Ld allocated, %d used)", fslen_ub, offset);
+		error_msg_and_die("not enough space allocated for ROM "
+			"image (%Ld allocated, %d used)", fslen_ub, offset);
 	}
 
 	written = write(fd, rom_image, offset);
 	if (written < 0) {
-		die(MKFS_ERROR, 1, "write failed");
+		error_msg_and_die("write failed");
 	}
 	if (offset != written) {
-		die(MKFS_ERROR, 0, "ROM image write failed (wrote %d of %d bytes)", written, offset);
+		error_msg_and_die("ROM image write failed (wrote %d of %d bytes)", written, offset);
 	}
+	
+	/* Free up memory */
+	free_filesystem_entry(root_entry);
+	free(root_entry);
 
 	/* (These warnings used to come at the start, but they scroll off the
 	   screen too quickly.) */