aboutsummaryrefslogtreecommitdiff
path: root/util-linux/fdisk_sgi.c
blob: d8acd6bc736e9354c383ac6d0f55b65b3bfa804f (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
#if ENABLE_FEATURE_SGI_LABEL

/*
 * Copyright (C) Andreas Neuper, Sep 1998.
 *      This file may be modified and redistributed under
 *      the terms of the GNU Public License.
 */

struct device_parameter { /* 48 bytes */
	unsigned char  skew;
	unsigned char  gap1;
	unsigned char  gap2;
	unsigned char  sparecyl;
	unsigned short pcylcount;
	unsigned short head_vol0;
	unsigned short ntrks;   /* tracks in cyl 0 or vol 0 */
	unsigned char  cmd_tag_queue_depth;
	unsigned char  unused0;
	unsigned short unused1;
	unsigned short nsect;   /* sectors/tracks in cyl 0 or vol 0 */
	unsigned short bytes;
	unsigned short ilfact;
	unsigned int   flags;           /* controller flags */
	unsigned int   datarate;
	unsigned int   retries_on_error;
	unsigned int   ms_per_word;
	unsigned short xylogics_gap1;
	unsigned short xylogics_syncdelay;
	unsigned short xylogics_readdelay;
	unsigned short xylogics_gap2;
	unsigned short xylogics_readgate;
	unsigned short xylogics_writecont;
};

/*
 * controller flags
 */
#define SECTOR_SLIP     0x01
#define SECTOR_FWD      0x02
#define TRACK_FWD       0x04
#define TRACK_MULTIVOL  0x08
#define IGNORE_ERRORS   0x10
#define RESEEK          0x20
#define ENABLE_CMDTAGQ  0x40

typedef struct {
	unsigned int   magic;            /* expect SGI_LABEL_MAGIC */
	unsigned short boot_part;        /* active boot partition */
	unsigned short swap_part;        /* active swap partition */
	unsigned char  boot_file[16];    /* name of the bootfile */
	struct device_parameter devparam;       /*  1 * 48 bytes */
	struct volume_directory {               /* 15 * 16 bytes */
		unsigned char vol_file_name[8]; /* a character array */
		unsigned int  vol_file_start;   /* number of logical block */
		unsigned int  vol_file_size;    /* number of bytes */
	} directory[15];
	struct sgi_partinfo {                  /* 16 * 12 bytes */
		unsigned int num_sectors;       /* number of blocks */
		unsigned int start_sector;      /* must be cylinder aligned */
		unsigned int id;
	} partitions[16];
	unsigned int   csum;
	unsigned int   fillbytes;
} sgi_partition;

typedef struct {
	unsigned int   magic;           /* looks like a magic number */
	unsigned int   a2;
	unsigned int   a3;
	unsigned int   a4;
	unsigned int   b1;
	unsigned short b2;
	unsigned short b3;
	unsigned int   c[16];
	unsigned short d[3];
	unsigned char  scsi_string[50];
	unsigned char  serial[137];
	unsigned short check1816;
	unsigned char  installer[225];
} sgiinfo;

#define SGI_LABEL_MAGIC         0x0be5a941
#define SGI_LABEL_MAGIC_SWAPPED 0x41a9e50b
#define SGI_INFO_MAGIC          0x00072959
#define SGI_INFO_MAGIC_SWAPPED  0x59290700

#define SGI_SSWAP16(x) (sgi_other_endian ? fdisk_swap16(x) : (uint16_t)(x))
#define SGI_SSWAP32(x) (sgi_other_endian ? fdisk_swap32(x) : (uint32_t)(x))

#define sgilabel ((sgi_partition *)MBRbuffer)
#define sgiparam (sgilabel->devparam)

/*
 *
 * fdisksgilabel.c
 *
 * Copyright (C) Andreas Neuper, Sep 1998.
 *      This file may be modified and redistributed under
 *      the terms of the GNU Public License.
 *
 * Sat Mar 20 EST 1999 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *      Internationalization
 */


static int sgi_other_endian;
static int debug;
static short sgi_volumes = 1;

/*
 * only dealing with free blocks here
 */

typedef struct {
	unsigned int first;
	unsigned int last;
} freeblocks;
static freeblocks freelist[17]; /* 16 partitions can produce 17 vacant slots */

static void
setfreelist(int i, unsigned int f, unsigned int l)
{
	freelist[i].first = f;
	freelist[i].last = l;
}

static void
add2freelist(unsigned int f, unsigned int l)
{
	int i;
	for (i = 0; i < 17 ; i++)
		if (freelist[i].last == 0)
			break;
	setfreelist(i, f, l);
}

static void
clearfreelist(void)
{
	int i;

	for (i = 0; i < 17 ; i++)
		setfreelist(i, 0, 0);
}

static unsigned int
isinfreelist(unsigned int b)
{
	int i;

	for (i = 0; i < 17 ; i++)
		if (freelist[i].first <= b && freelist[i].last >= b)
			return freelist[i].last;
	return 0;
}
	/* return last vacant block of this stride (never 0). */
	/* the '>=' is not quite correct, but simplifies the code */
/*
 * end of free blocks section
 */

static const struct systypes sgi_sys_types[] = {
/* SGI_VOLHDR   */	{ "\x00" "SGI volhdr"   },
/* 0x01         */	{ "\x01" "SGI trkrepl"  },
/* 0x02         */	{ "\x02" "SGI secrepl"  },
/* SGI_SWAP     */	{ "\x03" "SGI raw"      },
/* 0x04         */	{ "\x04" "SGI bsd"      },
/* 0x05         */	{ "\x05" "SGI sysv"     },
/* SGI_ENTIRE_DISK  */	{ "\x06" "SGI volume"   },
/* SGI_EFS      */	{ "\x07" "SGI efs"      },
/* 0x08         */	{ "\x08" "SGI lvol"     },
/* 0x09         */	{ "\x09" "SGI rlvol"    },
/* SGI_XFS      */	{ "\x0a" "SGI xfs"      },
/* SGI_XFSLOG   */	{ "\x0b" "SGI xfslog"   },
/* SGI_XLV      */	{ "\x0c" "SGI xlv"      },
/* SGI_XVM      */	{ "\x0d" "SGI xvm"      },
/* LINUX_SWAP   */	{ "\x82" "Linux swap"   },
/* LINUX_NATIVE */	{ "\x83" "Linux native" },
/* LINUX_LVM    */	{ "\x8d" "Linux LVM"    },
/* LINUX_RAID   */	{ "\xfd" "Linux RAID"   },
			{ NULL                  }
};


static int
sgi_get_nsect(void)
{
	return SGI_SSWAP16(sgilabel->devparam.nsect);
}

static int
sgi_get_ntrks(void)
{
	return SGI_SSWAP16(sgilabel->devparam.ntrks);
}

static unsigned int
two_s_complement_32bit_sum(unsigned int* base, int size /* in bytes */)
{
	int i = 0;
	unsigned int sum = 0;

	size /= sizeof(unsigned int);
	for (i = 0; i < size; i++)
		sum -= SGI_SSWAP32(base[i]);
	return sum;
}

static int
check_sgi_label(void)
{
	if (sizeof(sgilabel) > 512) {
		fprintf(stderr,
			_("According to MIPS Computer Systems, Inc the "
			"Label must not contain more than 512 bytes\n"));
		exit(1);
	}

	if (sgilabel->magic != SGI_LABEL_MAGIC
	 && sgilabel->magic != SGI_LABEL_MAGIC_SWAPPED) {
		current_label_type = label_dos;
		return 0;
	}

	sgi_other_endian = (sgilabel->magic == SGI_LABEL_MAGIC_SWAPPED);
	/*
	 * test for correct checksum
	 */
	if (two_s_complement_32bit_sum((unsigned int*)sgilabel,
				sizeof(*sgilabel))) {
		fprintf(stderr,
			_("Detected sgi disklabel with wrong checksum.\n"));
	}
	update_units();
	current_label_type = label_sgi;
	partitions = 16;
	sgi_volumes = 15;
	return 1;
}

static unsigned int
sgi_get_start_sector(int i)
{
	return SGI_SSWAP32(sgilabel->partitions[i].start_sector);
}

static unsigned int
sgi_get_num_sectors(int i)
{
	return SGI_SSWAP32(sgilabel->partitions[i].num_sectors);
}

static int
sgi_get_sysid(int i)
{
	return SGI_SSWAP32(sgilabel->partitions[i].id);
}

static int
sgi_get_bootpartition(void)
{
	return SGI_SSWAP16(sgilabel->boot_part);
}

static int
sgi_get_swappartition(void)
{
	return SGI_SSWAP16(sgilabel->swap_part);
}

static void
sgi_list_table(int xtra)
{
	int i, w, wd;
	int kpi = 0;                /* kernel partition ID */

	if(xtra) {
		printf(_("\nDisk %s (SGI disk label): %d heads, %d sectors\n"
			"%d cylinders, %d physical cylinders\n"
			"%d extra sects/cyl, interleave %d:1\n"
			"%s\n"
			"Units = %s of %d * 512 bytes\n\n"),
			disk_device, heads, sectors, cylinders,
			SGI_SSWAP16(sgiparam.pcylcount),
			SGI_SSWAP16(sgiparam.sparecyl),
			SGI_SSWAP16(sgiparam.ilfact),
			(char *)sgilabel,
			str_units(PLURAL), units_per_sector);
	} else {
		printf( _("\nDisk %s (SGI disk label): "
			"%d heads, %d sectors, %d cylinders\n"
			"Units = %s of %d * 512 bytes\n\n"),
			disk_device, heads, sectors, cylinders,
			str_units(PLURAL), units_per_sector );
	}

	w = strlen(disk_device);
	wd = strlen(_("Device"));
	if (w < wd)
	w = wd;

	printf(_("----- partitions -----\n"
		"Pt# %*s  Info     Start       End   Sectors  Id  System\n"),
		w + 2, _("Device"));
	for (i = 0 ; i < partitions; i++) {
		if( sgi_get_num_sectors(i) || debug ) {
			uint32_t start = sgi_get_start_sector(i);
			uint32_t len = sgi_get_num_sectors(i);
			kpi++;              /* only count nonempty partitions */
			printf(
			"%2d: %s %4s %9ld %9ld %9ld  %2x  %s\n",
/* fdisk part number */	i+1,
/* device */            partname(disk_device, kpi, w+3),
/* flags */             (sgi_get_swappartition() == i) ? "swap" :
/* flags */             (sgi_get_bootpartition() == i) ? "boot" : "    ",
/* start */             (long) scround(start),
/* end */               (long) scround(start+len)-1,
/* no odd flag on end */(long) len,
/* type id */           sgi_get_sysid(i),
/* type name */         partition_type(sgi_get_sysid(i)));
		}
	}
	printf(_("----- Bootinfo -----\nBootfile: %s\n"
		"----- Directory Entries -----\n"),
		sgilabel->boot_file);
	for (i = 0 ; i < sgi_volumes; i++) {
		if (sgilabel->directory[i].vol_file_size) {
			uint32_t start = SGI_SSWAP32(sgilabel->directory[i].vol_file_start);
			uint32_t len = SGI_SSWAP32(sgilabel->directory[i].vol_file_size);
			unsigned char *name = sgilabel->directory[i].vol_file_name;

			printf(_("%2d: %-10s sector%5u size%8u\n"),
				i, (char*)name, (unsigned int) start, (unsigned int) len);
		}
	}
}

static void
sgi_set_bootpartition(int i)
{
	sgilabel->boot_part = SGI_SSWAP16(((short)i));
}

static unsigned int
sgi_get_lastblock(void)
{
	return heads * sectors * cylinders;
}

static void
sgi_set_swappartition(int i)
{
	sgilabel->swap_part = SGI_SSWAP16(((short)i));
}

static int
sgi_check_bootfile(const char* aFile)
{
 	if (strlen(aFile) < 3) /* "/a\n" is minimum */ {
 		printf(_("\nInvalid Bootfile!\n"
 			"\tThe bootfile must be an absolute non-zero pathname,\n"
			"\te.g. \"/unix\" or \"/unix.save\".\n"));
		return 0;
	} else {
		if (strlen(aFile) > 16) {
			printf(_("\n\tName of Bootfile too long:  "
				"16 bytes maximum.\n"));
			return 0;
		} else {
			if (aFile[0] != '/') {
				printf(_("\n\tBootfile must have a "
					"fully qualified pathname.\n"));
				return 0;
			}
		}
 	}
	if (strncmp(aFile, (char*)sgilabel->boot_file, 16)) {
		printf(_("\n\tBe aware, that the bootfile is not checked for existence.\n\t"
			 "SGI's default is \"/unix\" and for backup \"/unix.save\".\n"));
		/* filename is correct and did change */
		return 1;
	}
	return 0;   /* filename did not change */
}

static const char *
sgi_get_bootfile(void)
{
	return (char*)sgilabel->boot_file;
}

static void
sgi_set_bootfile(const char* aFile)
{
	int i = 0;

	if (sgi_check_bootfile(aFile)) {
		while (i < 16) {
			if ((aFile[i] != '\n')  /* in principle caught again by next line */
			 && (strlen(aFile) > i))
				sgilabel->boot_file[i] = aFile[i];
			else
				sgilabel->boot_file[i] = 0;
			i++;
		}
		printf(_("\n\tBootfile is changed to \"%s\".\n"), sgilabel->boot_file);
	}
}

static void
create_sgiinfo(void)
{
	/* I keep SGI's habit to write the sgilabel to the second block */
	sgilabel->directory[0].vol_file_start = SGI_SSWAP32(2);
	sgilabel->directory[0].vol_file_size = SGI_SSWAP32(sizeof(sgiinfo));
	strncpy((char*)sgilabel->directory[0].vol_file_name, "sgilabel", 8);
}

static sgiinfo *fill_sgiinfo(void);

static void
sgi_write_table(void)
{
	sgilabel->csum = 0;
	sgilabel->csum = SGI_SSWAP32(two_s_complement_32bit_sum(
			(unsigned int*)sgilabel, sizeof(*sgilabel)));
	assert(two_s_complement_32bit_sum(
		(unsigned int*)sgilabel, sizeof(*sgilabel)) == 0);

	if (lseek(fd, 0, SEEK_SET) < 0)
		fdisk_fatal(unable_to_seek);
	if (write(fd, sgilabel, SECTOR_SIZE) != SECTOR_SIZE)
		fdisk_fatal(unable_to_write);
	if (!strncmp((char*)sgilabel->directory[0].vol_file_name, "sgilabel", 8)) {
		/*
		 * keep this habit of first writing the "sgilabel".
		 * I never tested whether it works without (AN 981002).
		 */
		sgiinfo *info = fill_sgiinfo();
		int infostartblock = SGI_SSWAP32(sgilabel->directory[0].vol_file_start);
		if (lseek(fd, infostartblock*SECTOR_SIZE, SEEK_SET) < 0)
			fdisk_fatal(unable_to_seek);
		if (write(fd, info, SECTOR_SIZE) != SECTOR_SIZE)
			fdisk_fatal(unable_to_write);
		free(info);
	}
}

static int
compare_start(int *x, int *y)
{
	/*
	 * sort according to start sectors
	 * and prefers largest partition:
	 * entry zero is entire disk entry
	 */
	unsigned int i = *x;
	unsigned int j = *y;
	unsigned int a = sgi_get_start_sector(i);
	unsigned int b = sgi_get_start_sector(j);
	unsigned int c = sgi_get_num_sectors(i);
	unsigned int d = sgi_get_num_sectors(j);

	if (a == b)
		return (d > c) ? 1 : (d == c) ? 0 : -1;
	return (a > b) ? 1 : -1;
}


static int
verify_sgi(int verbose)
{
	int Index[16];      /* list of valid partitions */
	int sortcount = 0;  /* number of used partitions, i.e. non-zero lengths */
	int entire = 0, i = 0;
	unsigned int start = 0;
	long long gap = 0;      /* count unused blocks */
	unsigned int lastblock = sgi_get_lastblock();

	clearfreelist();
	for (i = 0; i < 16; i++) {
		if (sgi_get_num_sectors(i) != 0) {
			Index[sortcount++] = i;
			if (sgi_get_sysid(i) == SGI_ENTIRE_DISK) {
				if (entire++ == 1) {
					if (verbose)
						printf(_("More than one entire disk entry present.\n"));
				}
			}
		}
	}
	if (sortcount == 0) {
		if (verbose)
			printf(_("No partitions defined\n"));
		return (lastblock > 0) ? 1 : (lastblock == 0) ? 0 : -1;
	}
	qsort(Index, sortcount, sizeof(Index[0]), (void*)compare_start);
	if (sgi_get_sysid(Index[0]) == SGI_ENTIRE_DISK) {
		if ((Index[0] != 10) && verbose)
			printf(_("IRIX likes when Partition 11 covers the entire disk.\n"));
		if ((sgi_get_start_sector(Index[0]) != 0) && verbose)
			printf(_("The entire disk partition should start "
				"at block 0,\n"
				"not at diskblock %d.\n"),
		sgi_get_start_sector(Index[0]));
		if (debug)      /* I do not understand how some disks fulfil it */
			if ((sgi_get_num_sectors(Index[0]) != lastblock) && verbose)
				printf(_("The entire disk partition is only %d diskblock large,\n"
					"but the disk is %d diskblocks long.\n"),
		sgi_get_num_sectors(Index[0]), lastblock);
		lastblock = sgi_get_num_sectors(Index[0]);
	} else {
		if (verbose)
			printf(_("One Partition (#11) should cover the entire disk.\n"));
		if (debug > 2)
			printf("sysid=%d\tpartition=%d\n",
				sgi_get_sysid(Index[0]), Index[0]+1);
	}
	for (i = 1, start = 0; i < sortcount; i++) {
		int cylsize = sgi_get_nsect() * sgi_get_ntrks();

		if ((sgi_get_start_sector(Index[i]) % cylsize) != 0) {
			if (debug)      /* I do not understand how some disks fulfil it */
				if (verbose)
					printf(_("Partition %d does not start on cylinder boundary.\n"),
						Index[i]+1);
		}
		if (sgi_get_num_sectors(Index[i]) % cylsize != 0) {
			if (debug)      /* I do not understand how some disks fulfil it */
				if (verbose)
					printf(_("Partition %d does not end on cylinder boundary.\n"),
						Index[i]+1);
		}
		/* We cannot handle several "entire disk" entries. */
		if (sgi_get_sysid(Index[i]) == SGI_ENTIRE_DISK) continue;
		if (start > sgi_get_start_sector(Index[i])) {
			if (verbose)
				printf(_("The Partition %d and %d overlap by %d sectors.\n"),
					Index[i-1]+1, Index[i]+1,
					start - sgi_get_start_sector(Index[i]));
			if (gap >  0) gap = -gap;
			if (gap == 0) gap = -1;
		}
		if (start < sgi_get_start_sector(Index[i])) {
			if (verbose)
				printf(_("Unused gap of %8u sectors - sectors %8u-%u\n"),
					sgi_get_start_sector(Index[i]) - start,
					start, sgi_get_start_sector(Index[i])-1);
			gap += sgi_get_start_sector(Index[i]) - start;
			add2freelist(start, sgi_get_start_sector(Index[i]));
		}
		start = sgi_get_start_sector(Index[i])
			   + sgi_get_num_sectors(Index[i]);
		if (debug > 1) {
			if (verbose)
				printf("%2d:%12d\t%12d\t%12d\n", Index[i],
					sgi_get_start_sector(Index[i]),
					sgi_get_num_sectors(Index[i]),
					sgi_get_sysid(Index[i]));
		}
	}
	if (start < lastblock) {
		if (verbose)
			printf(_("Unused gap of %8u sectors - sectors %8u-%u\n"),
				lastblock - start, start, lastblock-1);
		gap += lastblock - start;
		add2freelist(start, lastblock);
	}
	/*
	 * Done with arithmetics
	 * Go for details now
	 */
	if (verbose) {
		if (!sgi_get_num_sectors(sgi_get_bootpartition())) {
			printf(_("\nThe boot partition does not exist.\n"));
		}
		if (!sgi_get_num_sectors(sgi_get_swappartition())) {
			printf(_("\nThe swap partition does not exist.\n"));
		} else {
			if ((sgi_get_sysid(sgi_get_swappartition()) != SGI_SWAP)
			 && (sgi_get_sysid(sgi_get_swappartition()) != LINUX_SWAP))
				printf(_("\nThe swap partition has no swap type.\n"));
		}
		if (sgi_check_bootfile("/unix"))
			printf(_("\tYou have chosen an unusual boot file name.\n"));
	}
	return (gap > 0) ? 1 : (gap == 0) ? 0 : -1;
}

static int
sgi_gaps(void)
{
	/*
	 * returned value is:
	 *  = 0 : disk is properly filled to the rim
	 *  < 0 : there is an overlap
	 *  > 0 : there is still some vacant space
	 */
	return verify_sgi(0);
}

static void
sgi_change_sysid(int i, int sys)
{
	if( sgi_get_num_sectors(i) == 0 ) { /* caught already before, ... */
		printf(_("Sorry You may change the Tag of non-empty partitions.\n"));
		return;
	}
	if (((sys != SGI_ENTIRE_DISK) && (sys != SGI_VOLHDR))
	 && (sgi_get_start_sector(i) < 1) ) {
		read_maybe_empty(
			_("It is highly recommended that the partition at offset 0\n"
			"is of type \"SGI volhdr\", the IRIX system will rely on it to\n"
			"retrieve from its directory standalone tools like sash and fx.\n"
			"Only the \"SGI volume\" entire disk section may violate this.\n"
			"Type YES if you are sure about tagging this partition differently.\n"));
		if (strcmp(line_ptr, _("YES\n")))
			return;
	}
	sgilabel->partitions[i].id = SGI_SSWAP32(sys);
}

/* returns partition index of first entry marked as entire disk */
static int
sgi_entire(void)
{
	int i;

	for (i = 0; i < 16; i++)
		if (sgi_get_sysid(i) == SGI_VOLUME)
			return i;
	return -1;
}

static void
sgi_set_partition(int i, unsigned int start, unsigned int length, int sys)
{
	sgilabel->partitions[i].id = SGI_SSWAP32(sys);
	sgilabel->partitions[i].num_sectors = SGI_SSWAP32(length);
	sgilabel->partitions[i].start_sector = SGI_SSWAP32(start);
	set_changed(i);
	if (sgi_gaps() < 0)     /* rebuild freelist */
		printf(_("Do You know, You got a partition overlap on the disk?\n"));
}

static void
sgi_set_entire(void)
{
	int n;

	for (n = 10; n < partitions; n++) {
		if(!sgi_get_num_sectors(n) ) {
			sgi_set_partition(n, 0, sgi_get_lastblock(), SGI_VOLUME);
			break;
		}
	}
}

static void
sgi_set_volhdr(void)
{
	int n;

	for (n = 8; n < partitions; n++) {
	if (!sgi_get_num_sectors(n)) {
		/*
		 * 5 cylinders is an arbitrary value I like
		 * IRIX 5.3 stored files in the volume header
		 * (like sash, symmon, fx, ide) with ca. 3200
		 * sectors.
		 */
		if (heads * sectors * 5 < sgi_get_lastblock())
			sgi_set_partition(n, 0, heads * sectors * 5, SGI_VOLHDR);
			break;
		}
	}
}

static void
sgi_delete_partition(int i)
{
	sgi_set_partition(i, 0, 0, 0);
}

static void
sgi_add_partition(int n, int sys)
{
	char mesg[256];
	unsigned int first = 0, last = 0;

	if (n == 10) {
		sys = SGI_VOLUME;
	} else if (n == 8) {
		sys = 0;
	}
	if(sgi_get_num_sectors(n)) {
		printf(_("Partition %d is already defined.  Delete "
			"it before re-adding it.\n"), n + 1);
		return;
	}
	if ((sgi_entire() == -1) && (sys != SGI_VOLUME)) {
		printf(_("Attempting to generate entire disk entry automatically.\n"));
		sgi_set_entire();
		sgi_set_volhdr();
	}
	if ((sgi_gaps() == 0) && (sys != SGI_VOLUME)) {
		printf(_("The entire disk is already covered with partitions.\n"));
		return;
	}
	if (sgi_gaps() < 0) {
		printf(_("You got a partition overlap on the disk. Fix it first!\n"));
		return;
	}
	snprintf(mesg, sizeof(mesg), _("First %s"), str_units(SINGULAR));
	while (1) {
		if(sys == SGI_VOLUME) {
			last = sgi_get_lastblock();
			first = read_int(0, 0, last-1, 0, mesg);
			if (first != 0) {
				printf(_("It is highly recommended that eleventh partition\n"
						"covers the entire disk and is of type 'SGI volume'\n"));
			}
		} else {
			first = freelist[0].first;
			last  = freelist[0].last;
			first = read_int(scround(first), scround(first), scround(last)-1,
				0, mesg);
		}
		if (display_in_cyl_units)
			first *= units_per_sector;
		else
			first = first; /* align to cylinder if you know how ... */
		if(!last )
			last = isinfreelist(first);
		if(last == 0) {
			printf(_("You will get a partition overlap on the disk. "
				"Fix it first!\n"));
		} else
			break;
	}
	snprintf(mesg, sizeof(mesg), _(" Last %s"), str_units(SINGULAR));
	last = read_int(scround(first), scround(last)-1, scround(last)-1,
			scround(first), mesg)+1;
	if (display_in_cyl_units)
		last *= units_per_sector;
	else
		last = last; /* align to cylinder if You know how ... */
	if ( (sys == SGI_VOLUME) && (first != 0 || last != sgi_get_lastblock() ) )
		printf(_("It is highly recommended that eleventh partition\n"
			"covers the entire disk and is of type 'SGI volume'\n"));
	sgi_set_partition(n, first, last-first, sys);
}

#if ENABLE_FEATURE_FDISK_ADVANCED
static void
create_sgilabel(void)
{
	struct hd_geometry geometry;
	struct {
		unsigned int start;
		unsigned int nsect;
		int sysid;
	} old[4];
	int i = 0;
	long longsectors;               /* the number of sectors on the device */
	int res;                        /* the result from the ioctl */
	int sec_fac;                    /* the sector factor */

	sec_fac = sector_size / 512;    /* determine the sector factor */

	fprintf( stderr,
		_("Building a new SGI disklabel. Changes will remain in memory only,\n"
		"until you decide to write them. After that, of course, the previous\n"
		"content will be unrecoverably lost.\n\n"));

	sgi_other_endian = (BYTE_ORDER == LITTLE_ENDIAN);
	res = ioctl(fd, BLKGETSIZE, &longsectors);
	if (!ioctl(fd, HDIO_GETGEO, &geometry)) {
		heads = geometry.heads;
		sectors = geometry.sectors;
		if (res == 0) {
			/* the get device size ioctl was successful */
			cylinders = longsectors / (heads * sectors);
			cylinders /= sec_fac;
		} else {
			/* otherwise print error and use truncated version */
			cylinders = geometry.cylinders;
			fprintf(stderr,
				_("Warning:  BLKGETSIZE ioctl failed on %s.  "
				"Using geometry cylinder value of %d.\n"
				"This value may be truncated for devices"
				" > 33.8 GB.\n"), disk_device, cylinders);
		}
	}
	for (i = 0; i < 4; i++) {
		old[i].sysid = 0;
		if (valid_part_table_flag(MBRbuffer)) {
			if(get_part_table(i)->sys_ind) {
				old[i].sysid = get_part_table(i)->sys_ind;
				old[i].start = get_start_sect(get_part_table(i));
				old[i].nsect = get_nr_sects(get_part_table(i));
				printf(_("Trying to keep parameters of partition %d.\n"), i);
				if (debug)
					printf(_("ID=%02x\tSTART=%d\tLENGTH=%d\n"),
				old[i].sysid, old[i].start, old[i].nsect);
			}
		}
	}

	memset(MBRbuffer, 0, sizeof(MBRbuffer));
	sgilabel->magic = SGI_SSWAP32(SGI_LABEL_MAGIC);
	sgilabel->boot_part = SGI_SSWAP16(0);
	sgilabel->swap_part = SGI_SSWAP16(1);

	/* sizeof(sgilabel->boot_file) = 16 > 6 */
	memset(sgilabel->boot_file, 0, 16);
	strcpy((char*)sgilabel->boot_file, "/unix");

	sgilabel->devparam.skew                     = (0);
	sgilabel->devparam.gap1                     = (0);
	sgilabel->devparam.gap2                     = (0);
	sgilabel->devparam.sparecyl                 = (0);
	sgilabel->devparam.pcylcount                = SGI_SSWAP16(geometry.cylinders);
	sgilabel->devparam.head_vol0                = SGI_SSWAP16(0);
	sgilabel->devparam.ntrks                    = SGI_SSWAP16(geometry.heads);
						/* tracks/cylinder (heads) */
	sgilabel->devparam.cmd_tag_queue_depth      = (0);
	sgilabel->devparam.unused0                  = (0);
	sgilabel->devparam.unused1                  = SGI_SSWAP16(0);
	sgilabel->devparam.nsect                    = SGI_SSWAP16(geometry.sectors);
						/* sectors/track */
	sgilabel->devparam.bytes                    = SGI_SSWAP16(512);
	sgilabel->devparam.ilfact                   = SGI_SSWAP16(1);
	sgilabel->devparam.flags                    = SGI_SSWAP32(TRACK_FWD|
							IGNORE_ERRORS|RESEEK);
	sgilabel->devparam.datarate                 = SGI_SSWAP32(0);
	sgilabel->devparam.retries_on_error         = SGI_SSWAP32(1);
	sgilabel->devparam.ms_per_word              = SGI_SSWAP32(0);
	sgilabel->devparam.xylogics_gap1            = SGI_SSWAP16(0);
	sgilabel->devparam.xylogics_syncdelay       = SGI_SSWAP16(0);
	sgilabel->devparam.xylogics_readdelay       = SGI_SSWAP16(0);
	sgilabel->devparam.xylogics_gap2            = SGI_SSWAP16(0);
	sgilabel->devparam.xylogics_readgate        = SGI_SSWAP16(0);
	sgilabel->devparam.xylogics_writecont       = SGI_SSWAP16(0);
	memset( &(sgilabel->directory), 0, sizeof(struct volume_directory)*15 );
	memset( &(sgilabel->partitions), 0, sizeof(struct sgi_partinfo)*16 );
	current_label_type = label_sgi;
	partitions = 16;
	sgi_volumes = 15;
	sgi_set_entire();
	sgi_set_volhdr();
	for (i = 0; i < 4; i++) {
		if(old[i].sysid) {
			sgi_set_partition(i, old[i].start, old[i].nsect, old[i].sysid);
		}
	}
}

static void
sgi_set_xcyl(void)
{
	/* do nothing in the beginning */
}
#endif /* FEATURE_FDISK_ADVANCED */

/* _____________________________________________________________
 */

static sgiinfo *
fill_sgiinfo(void)
{
	sgiinfo *info = calloc(1, sizeof(sgiinfo));

	info->magic = SGI_SSWAP32(SGI_INFO_MAGIC);
	info->b1 = SGI_SSWAP32(-1);
	info->b2 = SGI_SSWAP16(-1);
	info->b3 = SGI_SSWAP16(1);
	/* You may want to replace this string !!!!!!! */
	strcpy( (char*)info->scsi_string, "IBM OEM 0662S12         3 30" );
	strcpy( (char*)info->serial, "0000" );
	info->check1816 = SGI_SSWAP16(18*256 +16 );
	strcpy( (char*)info->installer, "Sfx version 5.3, Oct 18, 1994" );
	return info;
}
#endif /* SGI_LABEL */