This file is indexed.

/usr/sbin/tgt-admin is in tgt 1:1.0.69-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

   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
#!/usr/bin/perl
#
# This tools parses /etc/tgt/targets.conf file and configures tgt
#
# Author:  Tomasz Chmielewski
# License: GPLv2
#

use strict;
use Config::General qw(ParseConfig);
use Getopt::Long;

# Our config file
my $configfile = "/etc/tgt/targets.conf";

sub usage {
	print <<EOF;
Usage:
tgt-admin [OPTION]...
This tool configures tgt targets.

  -e, --execute			read $configfile and execute tgtadm commands
      --delete <value>		delete all or selected targets
				(see "--delete help" for more info)
      --offline <value>		put all or selected targets in offline state
				(see "--offline help" for more info)
      --ready <value>		put all or selected targets in ready state
				(see "--ready help" for more info)
      --update <value>		update configuration for all or selected targets
				(see "--update help" for more info)
  -s, --show			show all the targets
  -C, --control-port <NNNN>	specify the control port to connect to
  -c, --conf <conf file>	specify an alternative configuration file
      --ignore-errors		continue even if tgtadm exits with non-zero code
  -f, --force			force some operations even if the target is in use
  -p, --pretend			only print tgtadm options
      --dump			dump current tgtd configuration (note: does not
				include detailed parameters, like write caching)
  -v, --verbose			increase verbosity (show tgtadm commands)
  -h, --help			show this help

EOF
	exit;
}

my %conf;
my $param = $ARGV[0];
my $execute = 0;
my $delete = 0;
my $offline = 0;
my $ready = 0;
my $update = 0;
my $show = 0;
my $alternate_conf="0";
my $ignore_errors = 0;
my $force = 0;
my $pretend = 0;
my $dump = 0;
my $verbose = 0;
my $help = 0;
my $control_port=0;
Getopt::Long::Configure("no_ignore_case");
my $result = GetOptions (
	"e|execute"     => \$execute,
	"delete=s"      => \$delete,
	"offline=s"     => \$offline,
	"ready=s"       => \$ready,
	"update=s"      => \$update,
	"s|show"        => \$show,
	"c|conf=s"      => \$alternate_conf,
	"ignore-errors" => \$ignore_errors,
	"f|force"       => \$force,
	"p|pretend"     => \$pretend,
	"dump"          => \$dump,
	"v|verbose"     => \$verbose,
	"h|help"        => \$help,
	"C|control-port=s"      => \$control_port,
);

if (($help == 1) || ($param eq undef)) {
	usage;
}

# Show all the targets and exit
if ($show == 1) {
	execute("tgtadm -C $control_port --op show --mode target");
	exit;
}

# Some variables/arrays/hashes we will use globally
my %tgtadm_output;
my %tgtadm_output_tid;
my %tgtadm_output_name;
my @largest_tid;
my $next_tid;
my %existing_accounts;

# Look up if iSNS is already on
sub check_isns {
	# We need to run as root
	if ( $> ) {
		die("You must be root to run this program.\n");
	}

	my @show_sys = `tgtadm -C $control_port --op show --mode sys`;
	foreach my $sys_line (@show_sys) {
		if ($sys_line =~ m/iSNS=On/) {
			return 1;
		}
	}
	# iSNS is not enabled if we're here
	return 0;
}

# Look up which targets are configured
sub process_targets {
	# We need to run as root
	if ( $> ) {
		die("You must be root to run this program.\n");
	}

	my @show_target = `tgtadm -C $control_port --op show --mode target`;
	my $tid;
	my $targetname;
	# Here, we create hashes of target names (all target data) and target tids
	foreach my $show_target_line (@show_target) {
		if ( $show_target_line =~ m/^Target (\d*): (.+)/ ) {
			$tid = $1;
			$targetname = $2;
			$tgtadm_output{$targetname} = $show_target_line;
			$tgtadm_output_tid{$targetname} = $tid;
			$tgtadm_output_name{$tid} = $targetname;
		} else {
			$tgtadm_output{$targetname} .= $show_target_line;
		}
	}
	# What is the largest tid?
	my @tids = values %tgtadm_output_tid;
	@largest_tid = sort { $a <=> $b } @tids;
	$next_tid = $largest_tid[$#largest_tid];
}

sub process_accounts {
	# We need to run as root
	if ( $> ) {
		die("You must be root to run this program.\n");
	}

	my @show_account = `tgtadm -C $control_port --op show --mode account`;
	# Here, we create a hash of accounts
	foreach my $show_account_line (@show_account) {
		if ( $show_account_line =~ m/^\s+(.*?)$/ ) {
			$existing_accounts{$1} = 1;
		}
	}
}

# Parse config file(s)
sub parse_configs {
	# Parse the config
	if ($alternate_conf ne 0) {
		# Check if alternative configuration file exists
		if (-e "$alternate_conf") {
			execute("# Using $alternate_conf as configuration file\n");
			%conf = ParseConfig(-ConfigFile => "$alternate_conf", -UseApacheInclude => 1, -IncludeDirectories => 1, -IncludeGlob => 1, -MergeDuplicateBlocks => 1);
		}
		else {
			die("Config file $alternate_conf not found. Exiting...\n");
		}
	} else {
		# Parse the config file with Config::General
		if (-e "$configfile") {
			%conf = ParseConfig(-ConfigFile => "$configfile", -UseApacheInclude => 1, -IncludeDirectories => 1, -IncludeGlob => 1, -MergeDuplicateBlocks => 1);
		} else {
			die("Config file $configfile not found. Exiting...\n");
		}
	}
}

# Add targets, if they are not configured already
my $default_driver;
my $target;
my $option;
my $value;
my $lun;

sub add_targets {
	my $single_target = $_[0];
	my $configured = $_[1];
	my $connected = $_[2];
	my $in_configfile = $_[3];
	my $isns_enabled = check_isns;
	foreach my $k (sort keys %conf) {

		if ($k eq "default-driver") {
			if (not length ref($conf{$k})) {
				$default_driver = $conf{$k};
			} else {
				print "Multiple default-driver definitions are not allowed!\n";
				print "Check your config file for errors.\n";
				exit 1;
			}
		} elsif ($k eq "ignore-errors") {
			if ($conf{$k} eq "yes") {
				$ignore_errors = 1;
			}
		} elsif (($k eq "iSNSAccessControl") || ($k eq "iSNSServerIP") ||
			($k eq "iSNSServerPort")) {
			if ($isns_enabled eq 0) {
				check_if_hash_array($conf{$k}, $k);
				execute("tgtadm -C $control_port --op update --mode sys --name $k -v $conf{$k}");
			}
		} elsif (($k eq "incomingdiscoveryuser") || ($k eq "outgoingdiscoveryuser")) {
			my @userpass = split(/ /, $conf{$k});
			check_value($userpass[1]);
			# Only delete or create account if it doesn't already exist
			if (! exists $existing_accounts{$userpass[0]} ) {
				execute("tgtadm -C $control_port --mode account --op new --user=$userpass[0] --password=$userpass[1]");
				$existing_accounts{$userpass[0]} = 1;
			}
			my $extra_str = "";
			if ($k eq "outgoingdiscoveryuser") {
				$extra_str = " --outgoing";
			}
			execute("tgtadm -C $control_port --mode account --op bind --user=$userpass[0] $extra_str");
		}

	}
	foreach my $k (sort keys %conf) {
		if ($k eq "iSNS") {
			if ($isns_enabled eq 0) {
				check_if_hash_array($conf{$k}, $k);
				execute("tgtadm -C $control_port --op update --mode sys --name $k -v $conf{$k}");
			} else {
				execute("# iSNS already enabled");
			}
		} elsif ($k eq "control-port") {
			if ($control_port eq 0) {
				$control_port = $conf{$k};
			} else {
				print "Multiple control-port definitions are not allowed!\n";
				print "Check your config file for errors.\n";
				exit 1;
			}
		}
	}
	# If $default_driver is empty, default to iscsi
	if (not defined $default_driver) {
		execute("# default-driver not defined, defaulting to iscsi.\n");
		$default_driver = "iscsi";
	}

	foreach my $k (sort keys %conf) {
		if ($k eq "target") {
			foreach my $k2 (sort keys %{$conf{$k}}) {
				# Do we run update or execute?
				if (length $single_target) {
					if ($single_target ne $k2) {
						next;
					} else {
						$target = $single_target;
					}
				} else {
					$target = $k2;
				}

				my $in_use = 0;
				if (length $single_target) {
					$in_use = main_delete($target);
				}
				my $allowall = 1;
				if ((not defined $tgtadm_output{$k2}) ||
					($update ne 0 && $in_use == 0) ||
					($update ne 0 && $in_use == 1 && $pretend == 1 && $force == 1))
					{
					# We have to find available tid
					if ($in_configfile == 1 && $configured == 0 && $pretend == 0) {
						my $maxtid = find_max_tid();
						$next_tid = $maxtid + 1;
					} elsif (length $single_target && $configured == 1) {
						$next_tid = $tgtadm_output_tid{$target};
					} else {
						$next_tid = $next_tid + 1;
					}

					# Before we add a target, we need to know its type
					# and other parameters which can be specified globally
					my %target_options;
					my $target_options_ref;
					my $data_key;
					foreach my $k3 (sort keys %{$conf{$k}{$k2}}) {
						$lun = 1;
						$option = $k3;
						$value = $conf{$k}{$k2}{$k3};
						check_value($value);
						$target_options{$option} = $value;
						$target_options_ref = \%target_options;
						$data_key = make_key($target_options_ref, "lun", "allow-in-use");
					}

					if (defined $target_options{"controller_tid"}) {
						$next_tid = $target_options{"controller_tid"};
					}
 
					if (not defined $target_options{"driver"}) {
						$target_options{"driver"} = $default_driver;
					}
					my $driver = $target_options{"driver"};
					execute("# Adding target: $target");
					execute("tgtadm -C $control_port --lld $driver --op new --mode target --tid $next_tid -T $target");
					foreach my $k3 (sort keys %{$conf{$k}{$k2}}) {
						$option = $k3;
						$value = $conf{$k}{$k2}{$k3};
						check_value($value);
						process_options($target_options_ref,$data_key);
						# If there was no option called "initiator-address", it means
						# we want to allow ALL initiators for this target
						if ($option eq "initiator-address") {
							$allowall = 0;
						}
					}

					if ($allowall == 1) {
						execute("tgtadm -C $control_port --lld $driver --op bind --mode target --tid $next_tid -I ALL");
					}

				} else {
					if (not length $configured || $in_use eq 1) {
						execute("# Target $target already exists!");
					}
				}
				$tgtadm_output_tid{$target} = $next_tid;
			}
			if (length $single_target && $in_configfile == 0 && $configured == 0) {
				print "Target $single_target is currently not configured\n";
				print "and does not exist in the config file - can't continue!\n";
				exit 1;
			}
			execute();
		}
	}
}

# Pre-parse the config and get some values we need
sub make_key {
	my $target_options_ref = shift;
	my @actions = @_;
	my %data_key;

	foreach my $action (@actions) {
		if (ref $$target_options_ref{'backing-store'} eq "HASH") {
			foreach my $testlun (keys %{$$target_options_ref{'backing-store'}}) {
				$data_key{$testlun}{$action} = $$target_options_ref{'backing-store'}{$testlun}{$action};
			}
		}
		if (ref $$target_options_ref{'direct-store'} eq "HASH") {
			foreach my $testlun (keys %{$$target_options_ref{'direct-store'}}) {
				$data_key{$testlun}{$action} = $$target_options_ref{'direct-store'}{$testlun}{$action};
			}
		}
	}
	return \%data_key;
}

# Some options can be specified only once
sub check_if_hash_array {
	my $check = $_[0];
	my $definition = $_[1];
	if (ref($check) eq 'ARRAY' || ref($check) eq "HASH") {
		if ($option) {
			print "Multiple '$definition' definitions in '$option' not allowed!\n";
			print "Check your config file for errors (target: $target).\n";
		} else {
			print "Multiple '$definition' definitions not allowed!\n";
			print "Check your config file for errors.\n";
		}
		exit 1;
	}
}

# Force an array if we just have one command
sub force_array {
	unless (ref($value) eq 'ARRAY') {
		$value = [ $value ];
	}
}

# If we start any external command, we want to know if it exists
sub check_exe {
	my $command = $_[0];
	my $option = $_[1];
	my @path = split(":", $ENV{PATH});
	my $exists = 0;
	foreach my $path (@path) {
		if ( -x "$path/$command" && -f "$path/$command" ) { $exists = 1 }
	}
	if ($exists == 0) {
		if ($command eq "sg_inq") {
			print "Command '$command' (needed by '$option') is not in your path - can't continue!\n";
			exit 1;
		} elsif ($command eq "lsof") {
			execute("# Command '$command' is not in your path.");
			execute("# Can't reliably check if device is not in use.");
			return 1;
		}
	}
}

# Apply additional parameters
sub add_params {
	my $param = shift;
	my $param_value = shift;
	my $lun = shift;
	my $driver = shift;

	if ($param eq "write-cache") {
		if ($param_value eq "off") {
			return("tgtadm -C $control_port --lld $driver --op update --mode logicalunit --tid $next_tid --lun=$lun --params mode_page=8:0:18:0x10:0:0xff:0xff:0:0:0xff:0xff:0xff:0xff:0x80:0x14:0:0:0:0:0:0");
		} elsif ($param_value eq "on" || not length $param_value) {
			return("# Write cache is enabled (default) for lun $lun.");
		} else {
			return("# WARNING! Unknown value ($param_value) to write-cache! Accepted values are \"on\" and \"off\".");
		}
	}

	if ($param eq "scsi_id" ||
	    $param eq "scsi_sn" ||
	    $param eq "vendor_id" ||
	    $param eq "product_id" ||
	    $param eq "product_rev" ||
	    $param eq "sense_format" ||
	    $param eq "removable" ||
	    $param eq "online" ||
	    $param eq "path" ||
	    $param eq "mode_page" ||
	    $param eq "lbppbe" ||
	    $param eq "la_lba" ||
	    $param eq "optimal_xfer_gran" ||
	    $param eq "optimal_xfer_len" ||
	    $param eq "readonly") {
		return("tgtadm -C $control_port --lld $driver --op update --mode logicalunit --tid $next_tid --lun=$lun --params $param=\"$param_value\"");
	}
	if ($param eq "params") {
		return("tgtadm -C $control_port --lld $driver --op update --mode logicalunit --tid $next_tid --lun=$lun --params \"$param_value\"");

	}
}

# Find next available LUN
sub find_next_lun {
	my $backing_store = $_[0];
	my $data_key_ref = $_[1];
	my $lun_collision = 0;
	my $lun_is_free = 0;
	my $found_lun = 1;
	while ($lun_is_free == 0) {
		foreach my $testlun (keys %$data_key_ref) {
			foreach my $testlun2 (values %{$$data_key_ref{$testlun}}) {
				if ($found_lun eq $testlun2) {
					$lun_collision = 1;
				}
			}
		}
		if ($lun_collision == 0) {
			$lun_is_free = 1;
		} else {
			$found_lun += 1;
		}
		$lun_collision = 0;
	}
	$$data_key_ref{$backing_store}{'lun'} = $found_lun;
	return $found_lun;
}

# Add backing or direct store
sub add_backing_direct {
	my $backing_store = $_[0];
	my $target_options_ref = $_[1];
	my $data_key_ref = $_[2];
	my $direct_store = $_[3];
	my $driver = $$target_options_ref{"driver"};
	my $bstype = $$target_options_ref{"bs-type"};

	# Is the device in use?
	my $can_alloc = 1;
	if ($bstype !~ "rbd" && $force != 1 && $$target_options_ref{'allow-in-use'} ne "yes") {
		$can_alloc = check_device($backing_store,$data_key_ref);
	}

	if ($can_alloc == 1 &&
	   ($bstype =~ "glfs" || $bstype =~ "rbd" || (-e $backing_store && ! -d $backing_store))) {
		my @exec_commands;
		my $device_type;
		my $bs_type;
		my $bsopts;
		my $bsoflags;
		my $block_size;
		my %luns;
		my @added_luns;
		# Find out LUNs which are "reserved" in the config file
		if (ref $value eq "HASH") {
			if (length $$data_key_ref{$backing_store}{'lun'}) {
				$lun = $$data_key_ref{$backing_store}{'lun'};
			} else {
				# Find an available lun if it wasn't specified
				$lun = find_next_lun($backing_store,$data_key_ref);
			}
		}
		# Process parameters for each lun / backing store
		if (ref $value eq "HASH") {
			my %params_added;
			my @mode_page;
			my @params;
			foreach my $store (keys %$value) {
				# lun
				if (length $$target_options_ref{"lun"}) {
					check_if_hash_array($$target_options_ref{"lun"}, "lun");
					$lun = $$target_options_ref{"lun"};
				}

				if (ref $$value{$store} eq "HASH" && $store eq $backing_store) {
					foreach my $store_option (keys %{$$value{$store}}) {
						my $result = $$value{$store}{$store_option};
						check_value($result);
						if ($store_option ne "mode_page" && $store_option ne "params")
							{ check_if_hash_array($result,$store_option) }
						# write-cache can be set globally per target and overridden per lun,
						# so we treat it differently
						if ($store_option ne "mode_page" && $store_option ne "write-cache"
							&& $store_option ne "params") {
							my $exec_command = add_params($store_option, $result, $lun, $driver);
							push(@exec_commands, $exec_command);
							$params_added{$store_option} = 1;
						}
						if ($store_option eq "write-cache") {
							my $exec_command = add_params($store_option, $result, $lun, $driver);
							$params_added{write_cache} = 1;
							push(@exec_commands, $exec_command);
						}
						if ($store_option eq "device-type") {
							$device_type = $result;
							$params_added{$store_option} = 1;
						}
						if ($store_option eq "bs-type") {
							$bs_type = $result;
							$params_added{$store_option} = 1;
						}
						if ($store_option eq "bsopts") {
							$bsopts = $result;
							$params_added{$store_option} = 1;
						}
						if ($store_option eq "bsoflags") {
							$bsoflags = $result;
							$params_added{$store_option} = 1;
						}
						if ($store_option eq "block-size") {
							$block_size = $result;
							$params_added{$store_option} = 1;
						}
						if ($store_option eq "mode_page") {
							unless (ref($result) eq 'ARRAY') {
								$result = [ $result ];
							}
							@mode_page = @$result;
							foreach my $mode_page (@mode_page) {
								my $exec_command = add_params($store_option, $mode_page, $lun, $driver);
								push(@exec_commands, $exec_command);
							}
						}
						if ($store_option eq "params") {
							unless (ref($result) eq 'ARRAY') {
								$result = [ $result ];
							}
							@params = @$result;
							foreach my $param (@params) {
								my $exec_command = add_params($store_option, $param, $lun, $driver);
								push(@exec_commands, $exec_command);
							}
						}
					}
				}
			}
			# Used only if lun is a direct-store
			my $sg_inq;
			my $sg_readcap;
			my %direct_params;
			if ($direct_store == 1) {
				$sg_inq=`sg_inq $backing_store`;
				if ($sg_inq=~m {
					Vendor\ identification:\s+?(.*?)\n
					\s+Product\ identification:\s+(.*?)\n
					\s+Product\ revision\ level:\s+(.*?)\n
					(?:\s+Unit\ serial\ number:\s+(.*?)\n)?
					}xs ) {
					# If they were not defined globally for a target,
					# add them now
					if (not length $$target_options_ref{vendor_id}) {
						$direct_params{vendor_id} = $1;
					}
					if (not length $$target_options_ref{product_id}) {
						$direct_params{product_id} = $2;
					}
					if (not length $$target_options_ref{product_rev}) {
						$direct_params{product_rev} = $3;
					}
					if (not length $$target_options_ref{scsi_sn}) {
						$direct_params{scsi_sn} = $4;
					}
				}

				$sg_inq=`sg_inq -p 0xb0 $backing_store`;
				if ($sg_inq=~m {
					Optimal\ transfer\ length\ granularity:\s+?(\d+).*?\n
					\s+Maximum\ transfer\ length:\s+?(\d+).*?\n
					\s+Optimal\ transfer\ length:\s+?(\d+).*?\n
					}xs ) {
					if (not length $$target_options_ref{optimal_xfer_gran}) {
						$direct_params{optimal_xfer_gran} = $1;
					}
					# $2 unused
					if (not length $$target_options_ref{optimal_xfer_len}) {
						$direct_params{optimal_xfer_len} = $3;
					}
				}

				$sg_readcap=`sg_readcap -16 $backing_store`;
				if ($sg_readcap=~ m {
					Logical\ block\ length=(\d+).*?\n
					\s+Logical\ blocks\ per\ physical\ block\ exponent=(\d+).*?\n
					\s+Lowest\ aligned\ logical\ block\ address=(\d+).*?\n
					}xs) {
					if (not length $block_size) {
						$block_size = $1;
					}
					if (not length $$target_options_ref{lbppbe}) {
						$direct_params{lbppbe} = $2;
					}
					if (not length $$target_options_ref{la_lba}) {
						$direct_params{la_lba} = $3;
					}
				}
			}

			# Add these parameters if they were not overwritten in the config file
			my @opts = ("scsi_id", "sense_format", "removable", "online", "path", "readonly");
			foreach my $single_opt (@opts) {
				check_if_hash_array($$target_options_ref{$single_opt},$single_opt);
				if ($params_added{$single_opt} ne 1 && length $$target_options_ref{$single_opt}) {
					my $exec_command = add_params($single_opt, $$target_options_ref{$single_opt}, $lun, $driver);
					push(@exec_commands, $exec_command);
					$params_added{$single_opt} = 1;
				}
			}
			# These options can be fetched by sg_inq for direct-store
			my @opts = ("vendor_id", "product_id", "product_rev", "scsi_sn",
				    "lbppbe", "la_lba", "optimal_xfer_gran", "optimal_xfer_len");
			foreach my $single_opt (@opts) {
				check_if_hash_array($$target_options_ref{$single_opt},$single_opt);
				my $this_opt;
				if (length $$target_options_ref{$single_opt}) {
					$this_opt = $$target_options_ref{$single_opt};
				} elsif (length $direct_params{$single_opt}) {
					$this_opt = $direct_params{$single_opt};
				}
				if ($params_added{$single_opt} ne 1 && length $this_opt) {
					my $exec_command = add_params($single_opt, $this_opt, $lun, $driver);
					push(@exec_commands, $exec_command);
					$params_added{$single_opt} = 1;
				}
			}
			# write-cache
			if ($params_added{write_cache} ne 1) {
				my $exec_command = add_params("write-cache", $$target_options_ref{"write-cache"}, $lun, $driver);
				push(@exec_commands, $exec_command);
				$params_added{write_cache} = 1;
			}
			# mode_page
			unless (ref($$target_options_ref{mode_page}) eq 'ARRAY') {
				$$target_options_ref{mode_page} = [ $$target_options_ref{mode_page} ];
			}
			foreach my $mode_page (@{$$target_options_ref{"mode_page"}}) {
				if (length $mode_page) {
					my $exec_command = add_params("mode_page", $mode_page, $lun, $driver);
					push(@exec_commands, $exec_command);
				}
			}
			# params
			unless (ref($$target_options_ref{params}) eq 'ARRAY') {
				$$target_options_ref{params} = [ $$target_options_ref{params} ];
			}
			foreach my $param (@{$$target_options_ref{"params"}}) {
				if (length $param) {
					my $exec_command = add_params("params", $param, $lun, $driver);
					push(@exec_commands, $exec_command);
				}
			}
			# device-type
			if ($params_added{"device-type"} ne 1) {
				check_if_hash_array($$target_options_ref{"device-type"}, "device-type");
				$device_type = $$target_options_ref{"device-type"};
			}
			# bs-type
			if ($params_added{"bs-type"} ne 1) {
				check_if_hash_array($$target_options_ref{"bs-type"}, "bs-type");
				$bs_type = $$target_options_ref{"bs-type"};
			}
			# bsopts
			if ($params_added{"bsopts"} ne 1) {
				check_if_hash_array($$target_options_ref{"bsopts"}, "bsopts");
				$bsopts = $$target_options_ref{"bsopts"};
			}
			# bsoflags
			if ($params_added{"bsoflags"} ne 1) {
				check_if_hash_array($$target_options_ref{"bsoflags"}, "bsoflags");
				$bsoflags = $$target_options_ref{"bsoflags"};
			}
		} else {
			print "If you got here, this means your config file is not supported.\n";
			print "Please report it to stgt mailing list and attach your config files.\n";
			exit 1;
		}
		# Execute commands for a given LUN
		if (length $device_type) { $device_type = "--device-type $device_type" };
		if (length $bs_type) { $bs_type = "--bstype $bs_type" };
		if (length $bsopts) { $bsopts = "--bsopts $bsopts" };
		if (length $bsoflags) { $bsoflags = "--bsoflags $bsoflags" };
		if (length $block_size) { $block_size = "--blocksize $block_size" };
		execute("tgtadm -C $control_port --lld $driver --op new --mode logicalunit --tid $next_tid --lun $lun -b $backing_store $device_type $bs_type $bsopts $bsoflags $block_size");

		# Commands should be executed in order
		my @execute_last;
		foreach my $exec_command (@exec_commands) {
			if (length $exec_command) {
				if ($exec_command =~ m/params mode_page/) {
					execute($exec_command);
				} else {
					push(@execute_last, $exec_command);
				}
			}
		}
		foreach my $exec_command (@execute_last) {
			execute($exec_command);
		}
		$lun += 1;
		return $lun;
	} elsif ($can_alloc == 0) {
		execute("# Skipping device $backing_store - it is in use.");
		execute("# You can override it with --force or 'allow-in-use yes' config option.");
		execute("# Note - do so only if you know what you're doing, you may damage your data.");
	} else {
		execute("# Skipping device: $backing_store");
		execute("# $backing_store does not exist - please check the configuration file");
	}
}

# Process options from the config file
sub process_options {
	my $target_options_ref = $_[0];
	my $data_key_ref = $_[1];
	my $driver = $$target_options_ref{"driver"};
	if ($option eq "backing-store" || $option eq "direct-store") {
		my $direct_store = 0;
		if ($option eq "direct-store") {
			check_exe("sg_inq", "option direct-store");
			$direct_store = 1;
		}

		# We want to make everything a hash to use it
		# in the same way later on
		unless (ref($value)) {
			$value = { $value }
		}

		my %arrvalue;
		if (ref($value) eq "ARRAY") {
			foreach my $backing_store (@$value) {
				$arrvalue{$backing_store} = 1;
			}
			$value = \%arrvalue;
		}

		if (ref($value) eq "HASH") {
			foreach my $backing_store (sort keys %$value) {
				if ($backing_store =~ m/HASH/) {
					print "\nYour config file is not supported. See targets.conf.example for details.\n";
					exit 1;
				}
			}
			foreach my $backing_store (sort keys %$value) {
				add_backing_direct($backing_store,$target_options_ref,$data_key_ref,$direct_store);
			}
		}
	}

	if ($option eq "incominguser") {
	        # if we have one command, force it to be an array anyway
		force_array();
		my @value_arr = @$value;
		foreach my $incominguser (@value_arr) {
			my @userpass = split(/ /, $incominguser);
			check_value($userpass[1]);
			# Only delete or create account if it doesn't already exist
			if (! exists $existing_accounts{$userpass[0]} ) {
				execute("tgtadm -C $control_port --lld $driver --mode account --op new --user=$userpass[0] --password=$userpass[1]");
				$existing_accounts{$userpass[0]} = 1;
			}
			execute("tgtadm -C $control_port --lld $driver --mode account --op bind --tid=$next_tid --user=$userpass[0]");
		}
	}

	if ($option eq "outgoinguser") {
	        # if we have one command, force it to be an array anyway
		force_array();
		if (length @$value[1]) {
			execute("# Warning: only one $option is allowed. Will only use the first one.");
		}
		my @userpass = split(/ /, @$value[0]);
		check_value($userpass[1]);
		# Only delete or create account if it doesn't already exist
		if (! exists $existing_accounts{$userpass[0]} ) {
			execute("tgtadm -C $control_port --lld $driver --mode account --op new --user=$userpass[0] --password=$userpass[1]");
			$existing_accounts{$userpass[0]} = 1;
		}
		execute("tgtadm -C $control_port --lld $driver --mode account --op bind --tid=$next_tid --user=$userpass[0] --outgoing");
	}

	if ($option eq "initiator-address") {
	        # if we have one command, force it to be an array anyway
		force_array();
		my @value_arr = @$value;
		foreach my $initiator_address (@value_arr) {
			check_value($initiator_address);
			execute("tgtadm -C $control_port --lld $driver --op bind --mode target --tid $next_tid -I $initiator_address");
		}
	}

	if ($option eq "initiator-name") {
	        # if we have one command, force it to be an array anyway
		force_array();
		my @value_arr = @$value;
		foreach my $initiator_name (@value_arr) {
			check_value($initiator_name);
			execute("tgtadm -C $control_port --lld $driver --op bind --mode target --tid $next_tid -Q $initiator_name");
		}
	}

	if ($option =~ m/^MaxRecvDataSegmentLength$|
			^MaxXmitDataSegmentLength$|
			^HeaderDigest$|
			^DataDigest$|
			^InitialR2T$|
			^MaxOutstandingR2T$|
			^ImmediateData$|
			^FirstBurstLength$|
			^MaxBurstLength$|
			^DataPDUInOrder$|
			^DataSequenceInOrder$|
			^ErrorRecoveryLevel$|
			^IFMarker$|
			^OFMarker$|
			^DefaultTime2Wait$|
			^DefaultTime2Retain$|
			^OFMarkInt$|
			^IFMarkInt$|
			^MaxConnections$|
			^state/x) {
	        # if we have one command, force it to be an array anyway
		force_array();
		if (length @$value[1]) {
			execute("# Warning: only one $option is allowed. Will only use the first one.");
		}
		check_value($option);
		execute("tgtadm -C $control_port --lld $driver --mode target --op update --tid $next_tid --name $option --value $$value[0]");
	}

}

# If the target is configured, but not present in the config file,
# try to remove it
sub remove_targets {

	process_targets;
	my @all_targets = keys %tgtadm_output_tid;

	foreach my $existing_target (@all_targets) {
		my $dontremove = 0;
		my $k2;
		foreach my $k (sort keys %conf) {
			if ( $k eq "target" ) {
				foreach $k2 (sort keys %{$conf{$k}}) {
					if ( $k2 eq $existing_target ) {
						$dontremove = 1;
					}
				}

				if ( $dontremove == 0 ) {
					# Remove the target
					main_delete($existing_target);
				}
			}
		}
	}
}

# Dump current tgtd configuration
sub dump_config {

	process_targets;

	my @all_targets = keys %tgtadm_output_tid;

	# If all targets use the same driver, use it only once in the config
	my $skip_driver = 0;
	my @drivers_combined;
	foreach my $current_target (@all_targets) {
		my $driver = show_target_info($current_target, "driver");
		push (@drivers_combined, $driver);
	}

	my %drivers_uniq;
	@drivers_uniq{@drivers_combined} = ();
	my @drivers_combined_uniq = sort keys %drivers_uniq;

	if (scalar @drivers_combined_uniq == 1) {
		print "default-driver $drivers_combined_uniq[0]\n\n";
	}

	# Print everything else in the config
	foreach my $current_target (@all_targets) {
		my $target_name = show_target_info($current_target, "target_name");
		print "<target $target_name>\n";

		if (scalar @drivers_combined_uniq gt 1) {
			my $driver = show_target_info($current_target, "driver");
			print "\tdriver $driver\n";
		}

		my @backing_stores = show_target_info($current_target, "backing_stores");
		foreach my $backing_store (@backing_stores) {
			print "\tbacking-store $backing_store\n";
		}

		my @account_information = show_target_info($current_target, "account_information");
		foreach my $account (@account_information) {
			if ($account =~ /(.+)\ \(outgoing\)/) {
				print "\toutgoinguser $1 PLEASE_CORRECT_THE_PASSWORD\n";
			} elsif (length $account) {
				print "\tincominguser $account PLEASE_CORRECT_THE_PASSWORD\n";
			}
		}

		my @acl_information = show_target_info($current_target, "acl_information");
		if (scalar(@acl_information) != 1 || $acl_information[0] ne "ALL") {
			foreach my $ini_address (@acl_information) {
				print "\tinitiator-address $ini_address\n";
			}
		}
		print "</target>\n\n";
	}
}

# Offline or ready targets
sub ready_offline_targets {
	my $var = $_[0]; # This variable is either "offline" or "ready"
	my $off_ready;
	if ($ready eq 0) {
		$off_ready = $offline
	} elsif ($offline eq 0) {
		$off_ready = $ready
	} else {
		print "Invalid value (you can't use both ready and offline)!\n";
		exit 1;
	}
	if ($off_ready eq "help") {
		print <<EOF;
      --$var <value>		$var all or selected targets

Example usage:
      --$var help	      - display this help
      --$var ALL	      - $var all targets
      --$var tid=4	      - $var target 4 (target with tid 4)
      --$var iqn.2008-08.com.example:some.target - $var this target

EOF
	} elsif ($off_ready eq "ALL") {
		process_targets;
		# Run over all targets and offline/ready them
		my @all_targets = keys %tgtadm_output_tid;
		foreach my $existing_target (@all_targets) {
			execute("tgtadm -C $control_port --op update --mode target --tid=$tgtadm_output_tid{$existing_target} -n state -v $var");
		}
	} elsif ($off_ready =~ m/tid=(.+)/) {
		process_targets;
		execute("tgtadm -C $control_port --op update --mode target --tid=$1 -n state -v $var");
	} else {
		process_targets;
		if (length $tgtadm_output_tid{$off_ready}) {
			execute("tgtadm -C $control_port --op update --mode target --tid=$tgtadm_output_tid{$off_ready} --name=\"$off_ready\" -n state -v $var");
		} else {
			print "There is no target with name \"$off_ready\", can't $var it!\n";
			exit 1;
		}
	}
}

# Show info for a given target
sub show_target_info {
	my $existing_target = $_[0];
	my $task = $_[1];
	# Returns target information
	if ($task eq "target_name") {
		if ($tgtadm_output{$existing_target} =~ m/^Target (\d*): (.+)/ ) {
			return $2;
		}
	# Returns driver information
	} elsif ($task eq "driver") {
		if ($tgtadm_output{$existing_target} =~ m/\s+Driver: (.+)/ ) {
			return $1;
		}
	# Returns backing store
	} elsif ($task eq "backing_stores") {
		if ($tgtadm_output{$existing_target} =~ m/\s+Backing store path: (?!None)(.+)/ ) {
			my @backing_stores = $tgtadm_output{$existing_target} =~ m{\s+Backing store path: (?!None\n)(.+)}g;
			return @backing_stores;
		}
		return;
	# Returns account information:
	} elsif ($task eq "account_information") {
		if ($tgtadm_output{$existing_target} =~ m{
			\s+Account\ information:\n(.*)\n\s+ACL\ information:
			     }xs
		      ) {
			my @accounts = split(/\n/, $1);
			my @account_information;
			foreach my $user (@accounts) {
				my @var = split(/^\s+/, $user);
				push(@account_information, $var[1]);
			}
			return @account_information;
		}
	# Returns ACL information
	} elsif ($task eq "acl_information") {
		if ($tgtadm_output{$existing_target} =~ m{
			\s+ACL\ information:\n(.*)
				}xs
			) {
			my @ini_addresses = split(/\n/, $1);
			my @acls;
			foreach my $ini_address (@ini_addresses) {
				my @var = split(/^\s+/, $ini_address);
				push(@acls, $var[1]);
			}
			return @acls;
		}
	# Returns sessions
	} elsif ($task eq "sessions") {
		my %sessions;
		if ($tgtadm_output{$existing_target} =~ m{
			\s+I_T\ nexus\ information:\n(.*)LUN\ information:
				}xs
			) {
			my @var = split(/\n/, $1);
			my $sid;
			my $cid;

			foreach my $line (@var) {
			if ($line =~ m/\s+I_T nexus:\ (.+)/) {
					$sid = $1;
				} else {
					if ($line =~ m/\s+Connection:\ (.+)/) {
						$cid = $1;
						$sessions{$sid} = $cid;
					}
				}
			}
		}
		return %sessions;
	}
}

# Main subroutine for deleting targets
sub main_delete {
	my $current_target = $_[0];
	my $current_tid = $_[1];
	my $configured = check_configured($current_target);
	my $del_upd_text;
	# Check if the target has initiators connected
	if ($tgtadm_output{$current_target} =~ m/\s+Connection:/) {
		if ($force == 1) {
			execute("# Removing target: $current_target");
			# Remove ACLs first
			my @acl_info = show_target_info($current_target, "acl_information");
			foreach my $acl (@acl_info) {
				execute("tgtadm -C $control_port --op unbind --mode target --tid $tgtadm_output_tid{$current_target} -I $acl");
			}
			# Now, remove all sessions / connections from that tid
			my %sessions = show_target_info($current_target, "sessions");
			foreach my $sid (keys %sessions) {
				foreach my $cid ($sessions{$sid}) {
					execute("tgtadm -C $control_port --op delete --mode conn --tid $tgtadm_output_tid{$current_target} --sid $sid --cid $cid");
				}
			}
			execute("tgtadm -C $control_port --mode target --op delete --tid=$tgtadm_output_tid{$current_target}");
		} else {
			if ($update ne 0) {
				$del_upd_text = "updated";
			} else {
				$del_upd_text = "deleted";
			}
			execute("# Target with tid $tgtadm_output_tid{$current_target} ($current_target) is in use, it won't be $del_upd_text.");
			return 1;
		}
	} elsif (length $tgtadm_output_tid{$current_target}) {
		execute("# Removing target: $current_target");
		execute("tgtadm -C $control_port --mode target --op delete --tid=$tgtadm_output_tid{$current_target}");
	} else {
		if (length $current_tid) {
			execute("# Target with tid $current_tid does not exist!");
		} else {
			execute("# Target with name $current_target does not exist!");
		}
	}
	if ($configured ne 0) {
		execute();
	}
	return 0;
}

# Delete the targets
sub delete_targets {

	if ($delete eq "help") {
		print <<EOF;
      --delete <value>		delete all or selected targets
				The target will be deleted only if it's not used
				(no initiator is connected to it).
				If you want to delete targets which are in use,
				you have to add "--force" flag.

Example usage:
      --delete help	      - display this help
      --delete ALL	      - delete all targets
      --delete tid=4	      - delete target 4 (target with tid 4)
      --delete iqn.2008-08.com.example:some.target - delete this target

EOF
		exit;
	} elsif ($delete eq "ALL") {
		process_targets;
		# Run over all targets and delete them
		my @all_targets = keys %tgtadm_output_tid;
		foreach my $current_target (@all_targets) {
			main_delete($current_target);
		}
	} elsif ($delete =~ m/^tid=(.+)/) {
		# Delete by tid
		process_targets;
		my $current_target = $tgtadm_output_name{$1};
		main_delete($current_target, $1);
	} else {
		# Delete by name
		process_targets;
		my $current_target = $delete;
		main_delete($current_target);
	}
}

# Update targets
sub update_targets {
	if ($update eq "help") {
		print <<EOF;
      --update <value>		update all or selected targets
				The target will be updated only if it's not used
				(no initiator is connected to it).
				If you want to update targets which are in use,
				you have to add "--force" flag.

Example usage:
      --update help	      - display this help
      --update ALL	      - update all targets
      --update tid=4	      - update target 4 (target with tid 4)
      --update iqn.2008-08.com.example:some.target - update this target

EOF
		exit;
	} elsif ($update eq "ALL") {
		# Run over all targets and delete them if they are not in use
		parse_configs;
		process_targets;
		my @targets_combined = combine_targets();
		foreach my $current_target (@targets_combined) {
			my $configured = check_configured($current_target);
			my $connected = check_connected($current_target);
			my $in_configfile = check_in_configfile($current_target);
			combine_targets();
			if (($in_configfile == 0) && ($configured == 1)) {
				# Delete the target if it's not in the config file
				main_delete($current_target);
			} else {
				add_targets($current_target, $configured, $connected, $in_configfile);
			}

		}
	} elsif ($update =~ m/^tid=(.+)/) {
		# Update by tid
		parse_configs;
		process_targets;
		my $current_target = $tgtadm_output_name{$1};
		my $configured = check_configured($current_target);
		my $connected = check_connected($current_target);
		my $in_configfile = check_in_configfile($current_target);
		if (($in_configfile == 0) && ($configured == 1)) {
			# Delete the target if it's not in the config file
			main_delete($current_target);
		} elsif ($configured == 1) {
			add_targets($current_target, $configured, $connected, $in_configfile);
		} else {
			print "There is no target with tid $1, can't continue!\n";
			exit 1;
		}
	} else {
		# Update by name
		parse_configs;
		process_targets;
		my $current_target = $update;
		my $configured = check_configured($current_target);
		my $connected = check_connected($current_target);
		my $in_configfile = check_in_configfile($current_target);
		if ($in_configfile == 0 && $configured == 1) {
			# Delete the target if it's not in the config file
			main_delete($current_target);
		} else {
			add_targets($current_target, $configured, $connected, $in_configfile);
		}
	}
}

# Find the biggest tid
sub find_max_tid {
	my @all_targets = keys %tgtadm_output_tid;
	my $maxtid = 0;
	foreach my $var (@all_targets) {
		if ($tgtadm_output_tid{$var} > $maxtid) {
			$maxtid = $tgtadm_output_tid{$var};
		}
	}
	return $maxtid;
}

# Combine targets from the config file and currently configured targets
sub combine_targets {
	my @targets_in_configfile;
	my @all_targets = keys %tgtadm_output_tid;
	my @targets_combined;
	# Make an array of targets in the config file
	foreach my $k (sort keys %conf) {
		if ( $k eq "target" ) {
			foreach my $k2 (sort keys %{$conf{$k}}) {
				push(@targets_in_configfile, $k2)
			}
		}
	}
	# Use only unique elements from both arrays
	foreach my $current_target (@all_targets) {
		push (@targets_combined, $current_target) unless grep { $_ eq $current_target } @targets_in_configfile;
	}
	@targets_combined = (@targets_combined, @targets_in_configfile);
	return @targets_combined;
}

# Check if a value is correct
sub check_value {
	if ( not defined $_[0] or not length $_[0] ) {
		print "\nOption $option has a missing value!\n";
		print "Check your config file for errors (target: $target)\n";
		exit 1;
	}
}

# Check if the target is in the config file
sub check_in_configfile {
	my $current_target = $_[0];
	my $result;
	foreach my $k (sort keys %conf) {
		if ( $k eq "target" ) {
			foreach my $k2 (sort keys %{$conf{$k}}) {
				if ($k2 eq $current_target) {
					return 1;
				}
			}
			# If we're here, we didn't find a match
			return 0;
		}
	}
}

# Check if the target is configured in tgtd
sub check_configured {
	my $current_target = $_[0];
	if (length $tgtadm_output_tid{$current_target}) {
		return 1;
	} else {
		return 0;
	}
}

# Check if any initiators are connected to the target
sub check_connected {
	my $current_target = $_[0];
	if ($tgtadm_output{$current_target} =~ m/\s+Connection:/) {
		return 1;
	} else {
		return 0;
	}
}

# Check if a device can be allocated
# Device can be used "by system" (i.e. mounted, used as swap, as a part of
# a RAID array etc.) or "by user" - i.e., already by tgtd, or someone doing:
#    dd if=/dev/1st_device of=/dev/2nd_device
# We shouldn't allow a device to be used more than one time, as it could
# cause corruption when written several times. Unless the user really wants to.
sub check_device {
	my $backing_store = $_[0];
	my $data_key_ref = $_[1];

	# If allow-in-use is "yes", there is no need to do
	# farther tests
	if ($$data_key_ref{$backing_store}{'allow-in-use'} eq "yes") {
		return 1;
	}

	if (! -e $backing_store) {
		return 1;
	}

	# Check if the system uses this device
	use Fcntl qw(O_RDONLY O_EXCL);
	use Errno;
	sysopen(FH, $backing_store, O_RDONLY | O_EXCL);
	if ($!{EBUSY}) {
		execute("# Device $backing_store is used by the system (mounted, used by swap?).");
		return 0;
	}
	close(FH);

	# Check if userspace uses this device
	my $lsof_check = check_exe("lsof");
	if ($lsof_check ne 1) {
		system("lsof $backing_store >/dev/null 2>&1");
		my $exit_value  = $? >> 8;
		if ($exit_value eq 0) {
			execute("# Device $backing_store is used (already tgtd target?).");
			execute("# Run 'lsof $backing_store' to see the details.");
			return 0;
		}
	}
	return 1;
}

# Execute or just print (or both) everything we start or would start
sub execute {
	if ($pretend == 0) {

		my $args = "@_";
		if ($verbose == 1) {
			print "$args\n";
		}
		# Don't try to execute if it's a comment
		my @execargs = split(/#/, $args);
		if ($execargs[0] ne undef) {
			system($args);

			# If non-zero exit code was return, exit
			my $exit_value  = $? >> 8;
			if (($exit_value != 0) && ($ignore_errors == 0)) {
				print "Command:\n\t$args\nexited with code: $exit_value.\n";
				exit $exit_value;
			}
		}

	} elsif ($pretend == 1) {
		print "@_\n";
	}
}

if ($execute == 1) {
	parse_configs;
	process_targets;
	process_accounts;
	add_targets;
	remove_targets;
} elsif ($delete ne 0) {
	delete_targets;
} elsif ($update ne 0) {
	process_accounts;
	update_targets;
} elsif ($dump == 1) {
	dump_config;
} elsif ($offline ne 0) {
	ready_offline_targets("offline");
} elsif ($ready ne 0) {
	ready_offline_targets("ready");
} else {
	print "No action specified.\n";
}