Linux Audio

Check our new training course

Loading...
   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
/* vi: set sw=4 ts=4: */
/*
 * fsck --- A generic, parallelizing front-end for the fsck program.
 * It will automatically try to run fsck programs in parallel if the
 * devices are on separate spindles.  It is based on the same ideas as
 * the generic front end for fsck by David Engel and Fred van Kempen,
 * but it has been completely rewritten from scratch to support
 * parallel execution.
 *
 * Written by Theodore Ts'o, <tytso@mit.edu>
 *
 * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
 *   o Changed -t fstype to behave like with mount when -A (all file
 *     systems) or -M (like mount) is specified.
 *   o fsck looks if it can find the fsck.type program to decide
 *     if it should ignore the fs type. This way more fsck programs
 *     can be added without changing this front-end.
 *   o -R flag skip root file system.
 *
 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
 *      2001, 2002, 2003, 2004, 2005 by  Theodore Ts'o.
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */

/* All filesystem specific hooks have been removed.
 * If filesystem cannot be determined, we will execute
 * "fsck.auto". Currently this also happens if you specify
 * UUID=xxx or LABEL=xxx as an object to check.
 * Detection code for that is also probably has to be in fsck.auto.
 *
 * In other words, this is _really_ is just a driver program which
 * spawns actual fsck.something for each filesystem to check.
 * It doesn't guess filesystem types from on-disk format.
 */
//config:config FSCK
//config:	bool "fsck (7.4 kb)"
//config:	default y
//config:	help
//config:	fsck is used to check and optionally repair one or more filesystems.
//config:	In actuality, fsck is simply a front-end for the various file system
//config:	checkers (fsck.fstype) available under Linux.

//applet:IF_FSCK(APPLET(fsck, BB_DIR_SBIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_FSCK) += fsck.o

//usage:#define fsck_trivial_usage
//usage:       "[-ANPRTV] [-t FSTYPE] [FS_OPTS] [BLOCKDEV]..."
//usage:#define fsck_full_usage "\n\n"
//usage:       "Check and repair filesystems\n"
//usage:     "\n	-A	Walk /etc/fstab and check all filesystems"
//usage:     "\n	-N	Don't execute, just show what would be done"
//usage:     "\n	-P	With -A, check filesystems in parallel"
//usage:     "\n	-R	With -A, skip the root filesystem"
//usage:     "\n	-T	Don't show title on startup"
//usage:     "\n	-V	Verbose"
//DO_PROGRESS_INDICATOR is off:
////usage:     "\n	-C FD	Write status information to specified file descriptor"
//usage:     "\n	-t TYPE	List of filesystem types to check"

#include "libbb.h"
#include "common_bufsiz.h"

/* "progress indicator" code is somewhat buggy and ext[23] specific.
 * We should be filesystem agnostic. IOW: there should be a well-defined
 * API for fsck.something, NOT ad-hoc hacks in generic fsck. */
#define DO_PROGRESS_INDICATOR 0

/* fsck 1.41.4 (27-Jan-2009) manpage says:
 * 0   - No errors
 * 1   - File system errors corrected
 * 2   - System should be rebooted
 * 4   - File system errors left uncorrected
 * 8   - Operational error
 * 16  - Usage or syntax error
 * 32  - Fsck canceled by user request
 * 128 - Shared library error
 */
#define EXIT_OK          0
#define EXIT_NONDESTRUCT 1
#define EXIT_DESTRUCT    2
#define EXIT_UNCORRECTED 4
#define EXIT_ERROR       8
#define EXIT_USAGE       16
#define FSCK_CANCELED    32     /* Aborted with a signal or ^C */

/*
 * Internal structure for mount table entries.
 */
struct fs_info {
	struct fs_info *next;
	char	*device;
	char	*mountpt;
	char	*type;
	char	*opts;
	int	passno;
	int	flags;
};

#define FLAG_DONE 1
#define FLAG_PROGRESS 2
/*
 * Structure to allow exit codes to be stored
 */
struct fsck_instance {
	struct fsck_instance *next;
	int	pid;
	int	flags;
#if DO_PROGRESS_INDICATOR
	time_t	start_time;
#endif
	char	*prog;
	char	*device;
	char	*base_device; /* /dev/hda for /dev/hdaN etc */
};

static const char ignored_types[] ALIGN1 =
	"ignore\0"
	"iso9660\0"
	"nfs\0"
	"proc\0"
	"sw\0"
	"swap\0"
	"tmpfs\0"
	"devpts\0";

#if 0
static const char really_wanted[] ALIGN1 =
	"minix\0"
	"ext2\0"
	"ext3\0"
	"jfs\0"
	"reiserfs\0"
	"xiafs\0"
	"xfs\0";
#endif

#define BASE_MD "/dev/md"

struct globals {
	char **args;
	int num_args;
	int verbose;

#define FS_TYPE_FLAG_NORMAL 0
#define FS_TYPE_FLAG_OPT    1
#define FS_TYPE_FLAG_NEGOPT 2
	char **fs_type_list;
	uint8_t *fs_type_flag;
	smallint fs_type_negated;

	smallint noexecute;
	smallint serialize;
	smallint skip_root;
	/* smallint like_mount; */
	smallint parallel_root;
	smallint force_all_parallel;
	smallint kill_sent;

#if DO_PROGRESS_INDICATOR
	smallint progress;
	int progress_fd;
#endif

	int num_running;
	int max_running;
	char *fstype;
	struct fs_info *filesys_info;
	struct fs_info *filesys_last;
	struct fsck_instance *instance_list;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { \
	setup_common_bufsiz(); \
	BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
} while (0)

/*
 * Return the "base device" given a particular device; this is used to
 * assure that we only fsck one partition on a particular drive at any
 * one time.  Otherwise, the disk heads will be seeking all over the
 * place.  If the base device cannot be determined, return NULL.
 *
 * The base_device() function returns an allocated string which must
 * be freed.
 */
#if ENABLE_FEATURE_DEVFS
/*
 * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
 * pathames.
 */
static const char *const devfs_hier[] = {
	"host", "bus", "target", "lun", NULL
};
#endif

static char *base_device(const char *device)
{
	char *str, *cp;
#if ENABLE_FEATURE_DEVFS
	const char *const *hier;
	const char *disk;
	int len;
#endif
	str = xstrdup(device);

	/* Skip over "/dev/"; if it's not present, give up */
	cp = skip_dev_pfx(str);
	if (cp == str)
		goto errout;

	/*
	 * For md devices, we treat them all as if they were all
	 * on one disk, since we don't know how to parallelize them.
	 */
	if (cp[0] == 'm' && cp[1] == 'd') {
		cp[2] = 0;
		return str;
	}

	/* Handle DAC 960 devices */
	if (is_prefixed_with(cp, "rd/")) {
		cp += 3;
		if (cp[0] != 'c' || !isdigit(cp[1])
		 || cp[2] != 'd' || !isdigit(cp[3]))
			goto errout;
		cp[4] = 0;
		return str;
	}

	/* Now let's handle /dev/hd* and /dev/sd* devices.... */
	if ((cp[0] == 'h' || cp[0] == 's') && cp[1] == 'd') {
		cp += 2;
		/* If there's a single number after /dev/hd, skip it */
		if (isdigit(*cp))
			cp++;
		/* What follows must be an alpha char, or give up */
		if (!isalpha(*cp))
			goto errout;
		cp[1] = 0;
		return str;
	}

#if ENABLE_FEATURE_DEVFS
	/* Now let's handle devfs (ugh) names */
	len = 0;
	if (is_prefixed_with(cp, "ide/"))
		len = 4;
	if (is_prefixed_with(cp, "scsi/"))
		len = 5;
	if (len) {
		cp += len;
		/*
		 * Now we proceed down the expected devfs hierarchy.
		 * i.e., .../host1/bus2/target3/lun4/...
		 * If we don't find the expected token, followed by
		 * some number of digits at each level, abort.
		 */
		for (hier = devfs_hier; *hier; hier++) {
			cp = is_prefixed_with(cp, *hier);
			if (!cp)
				goto errout;
			while (*cp != '/' && *cp != '\0') {
				if (!isdigit(*cp))
					goto errout;
				cp++;
			}
//FIXME: what if *cp = '\0' now? cp++ moves past it!!!
			cp++;
		}
		cp[-1] = '\0';
		return str;
	}

	/* Now handle devfs /dev/disc or /dev/disk names */
	disk = NULL;
	if (is_prefixed_with(cp, "discs/"))
		disk = "disc";
	else if (is_prefixed_with(cp, "disks/"))
		disk = "disk";
	if (disk) {
		cp += 6;
		cp = is_prefixed_with(cp, disk);
		if (!cp)
			goto errout;
		while (*cp != '/' && *cp != '\0') {
			if (!isdigit(*cp))
				goto errout;
			cp++;
		}
		*cp = '\0';
		return str;
	}
#endif
 errout:
	free(str);
	return NULL;
}

static void free_instance(struct fsck_instance *p)
{
	free(p->prog);
	free(p->device);
	free(p->base_device);
	free(p);
}

static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
					const char *type, const char *opts,
					int passno)
{
	struct fs_info *fs;

	fs = xzalloc(sizeof(*fs));
	fs->device = xstrdup(device);
	fs->mountpt = xstrdup(mntpnt);
	if (strchr(type, ','))
		type = (char *)"auto";
	fs->type = xstrdup(type);
	fs->opts = xstrdup(opts ? opts : "");
	fs->passno = passno < 0 ? 1 : passno;
	/*fs->flags = 0; */
	/*fs->next = NULL; */

	if (!G.filesys_info)
		G.filesys_info = fs;
	else
		G.filesys_last->next = fs;
	G.filesys_last = fs;

	return fs;
}

/* Load the filesystem database from /etc/fstab */
static void load_fs_info(const char *filename)
{
	FILE *fstab;
	struct mntent mte;
	char buf[1024];

	fstab = setmntent(filename, "r");
	if (!fstab) {
		bb_perror_msg("can't read '%s'", filename);
		return;
	}

	// Loop through entries
	while (getmntent_r(fstab, &mte, buf, sizeof(buf))) {
		//bb_error_msg("CREATE[%s][%s][%s][%s][%d]", mte.mnt_fsname, mte.mnt_dir,
		//	mte.mnt_type, mte.mnt_opts,
		//	mte.mnt_passno);
		create_fs_device(mte.mnt_fsname, mte.mnt_dir,
			mte.mnt_type, mte.mnt_opts,
			mte.mnt_passno);
	}
	endmntent(fstab);
}

/* Lookup filesys in /etc/fstab and return the corresponding entry. */
static struct fs_info *lookup(char *filesys)
{
	struct fs_info *fs;

	for (fs = G.filesys_info; fs; fs = fs->next) {
		if (strcmp(filesys, fs->device) == 0
		 || (fs->mountpt && strcmp(filesys, fs->mountpt) == 0)
		)
			break;
	}

	return fs;
}

#if DO_PROGRESS_INDICATOR
static int progress_active(void)
{
	struct fsck_instance *inst;

	for (inst = G.instance_list; inst; inst = inst->next) {
		if (inst->flags & FLAG_DONE)
			continue;
		if (inst->flags & FLAG_PROGRESS)
			return 1;
	}
	return 0;
}
#endif


/*
 * Send a signal to all outstanding fsck child processes
 */
static void kill_all_if_got_signal(void)
{
	struct fsck_instance *inst;

	if (!bb_got_signal || G.kill_sent)
		return;

	for (inst = G.instance_list; inst; inst = inst->next) {
		if (inst->flags & FLAG_DONE)
			continue;
		kill(inst->pid, SIGTERM);
	}
	G.kill_sent = 1;
}

/*
 * Wait for one child process to exit; when it does, unlink it from
 * the list of executing child processes, free, and return its exit status.
 * If there is no exited child, return -1.
 */
static int wait_one(int flags)
{
	int status;
	int exitcode;
	struct fsck_instance *inst, *prev;
	pid_t pid;

	if (!G.instance_list)
		return -1;
	/* if (G.noexecute) { already returned -1; } */

	while (1) {
		pid = waitpid(-1, &status, flags);
		kill_all_if_got_signal();
		if (pid == 0) /* flags == WNOHANG and no children exited */
			return -1;
		if (pid < 0) {
			if (errno == EINTR)
				continue;
			if (errno == ECHILD) { /* paranoia */
				bb_simple_error_msg("wait: no more children");
				return -1;
			}
			bb_simple_perror_msg("wait");
			continue;
		}
		prev = NULL;
		inst = G.instance_list;
		do {
			if (inst->pid == pid)
				goto child_died;
			prev = inst;
			inst = inst->next;
		} while (inst);
	}
 child_died:

	exitcode = WEXITSTATUS(status);
	if (WIFSIGNALED(status)) {
		unsigned sig;
		sig = WTERMSIG(status);
		exitcode = EXIT_UNCORRECTED;
		if (sig != SIGINT) {
			printf("Warning: %s %s terminated "
				"by signal %u\n",
				inst->prog, inst->device, sig);
			exitcode = EXIT_ERROR;
		}
	}

#if DO_PROGRESS_INDICATOR
	if (progress && (inst->flags & FLAG_PROGRESS) && !progress_active()) {
		struct fsck_instance *inst2;
		for (inst2 = G.instance_list; inst2; inst2 = inst2->next) {
			if (inst2->flags & FLAG_DONE)
				continue;
			if (strcmp(inst2->type, "ext2") != 0
			 && strcmp(inst2->type, "ext3") != 0
			) {
				continue;
			}
			/* ext[23], we will send USR1
			 * (request to start displaying progress bar)
			 *
			 * If we've just started the fsck, wait a tiny
			 * bit before sending the kill, to give it
			 * time to set up the signal handler
			 */
			if (inst2->start_time >= time(NULL) - 1)
				sleep1();
			kill(inst2->pid, SIGUSR1);
			inst2->flags |= FLAG_PROGRESS;
			break;
		}
	}
#endif

	if (prev)
		prev->next = inst->next;
	else
		G.instance_list = inst->next;
	if (G.verbose > 1)
		printf("Finished with %s (exit status %u)\n",
			inst->device, exitcode);
	G.num_running--;
	free_instance(inst);

	return exitcode;
}

/*
 * Wait until all executing child processes have exited; return the
 * logical OR of all of their exit code values.
 */
#define FLAG_WAIT_ALL           0
#define FLAG_WAIT_ATLEAST_ONE   WNOHANG
static int wait_many(int flags)
{
	int exit_status;
	int global_status = 0;
	int wait_flags = 0;

	while ((exit_status = wait_one(wait_flags)) != -1) {
		global_status |= exit_status;
		wait_flags |= flags;
	}
	return global_status;
}

/*
 * Execute a particular fsck program, and link it into the list of
 * child processes we are waiting for.
 */
static void execute(const char *type, const char *device,
		const char *mntpt /*, int interactive */)
{
	int i;
	struct fsck_instance *inst;
	pid_t pid;

	G.args[0] = xasprintf("fsck.%s", type);

#if DO_PROGRESS_INDICATOR
	if (progress && !progress_active()) {
		if (strcmp(type, "ext2") == 0
		 || strcmp(type, "ext3") == 0
		) {
			G.args[XXX] = xasprintf("-C%d", progress_fd); /* 1 */
			inst->flags |= FLAG_PROGRESS;
		}
	}
#endif

	G.args[G.num_args - 2] = (char*)device;
	/* G.args[G.num_args - 1] = NULL; - already is */

	if (G.verbose || G.noexecute) {
		printf("[%s (%d) -- %s]", G.args[0], G.num_running,
					mntpt ? mntpt : device);
		for (i = 0; G.args[i]; i++)
			printf(" %s", G.args[i]);
		bb_putchar('\n');
	}

	/* Fork and execute the correct program. */
	pid = -1;
	if (!G.noexecute) {
		pid = spawn(G.args);
		if (pid < 0)
			bb_simple_perror_msg(G.args[0]);
	}

#if DO_PROGRESS_INDICATOR
	free(G.args[XXX]);
#endif

	/* No child, so don't record an instance */
	if (pid <= 0) {
		free(G.args[0]);
		return;
	}

	inst = xzalloc(sizeof(*inst));
	inst->pid = pid;
	inst->prog = G.args[0];
	inst->device = xstrdup(device);
	inst->base_device = base_device(device);
#if DO_PROGRESS_INDICATOR
	inst->start_time = time(NULL);
#endif

	/* Add to the list of running fsck's.
	 * (was adding to the end, but adding to the front is simpler...) */
	inst->next = G.instance_list;
	G.instance_list = inst;
}

/*
 * Run the fsck program on a particular device
 *
 * If the type is specified using -t, and it isn't prefixed with "no"
 * (as in "noext2") and only one filesystem type is specified, then
 * use that type regardless of what is specified in /etc/fstab.
 *
 * If the type isn't specified by the user, then use either the type
 * specified in /etc/fstab, or "auto".
 */
static void fsck_device(struct fs_info *fs /*, int interactive */)
{
	const char *type;

	if (strcmp(fs->type, "auto") != 0) {
		type = fs->type;
		if (G.verbose > 2)
			printf("using filesystem type '%s' %s\n",
					type, "from fstab");
	} else if (G.fstype
	 && (G.fstype[0] != 'n' || G.fstype[1] != 'o') /* != "no" */
	 && !is_prefixed_with(G.fstype, "opts=")
	 && !is_prefixed_with(G.fstype, "loop")
	 && !strchr(G.fstype, ',')
	) {
		type = G.fstype;
		if (G.verbose > 2)
			printf("using filesystem type '%s' %s\n",
					type, "from -t");
	} else {
		type = "auto";
		if (G.verbose > 2)
			printf("using filesystem type '%s' %s\n",
					type, "(default)");
	}

	G.num_running++;
	execute(type, fs->device, fs->mountpt /*, interactive */);
}

/*
 * Returns TRUE if a partition on the same disk is already being
 * checked.
 */
static int device_already_active(char *device)
{
	struct fsck_instance *inst;
	char *base;

	if (G.force_all_parallel)
		return 0;

#ifdef BASE_MD
	/* Don't check a soft raid disk with any other disk */
	if (G.instance_list
	 && (is_prefixed_with(G.instance_list->device, BASE_MD)
	     || is_prefixed_with(device, BASE_MD))
	) {
		return 1;
	}
#endif

	base = base_device(device);
	/*
	 * If we don't know the base device, assume that the device is
	 * already active if there are any fsck instances running.
	 */
	if (!base)
		return (G.instance_list != NULL);

	for (inst = G.instance_list; inst; inst = inst->next) {
		if (!inst->base_device || strcmp(base, inst->base_device) == 0) {
			free(base);
			return 1;
		}
	}

	free(base);
	return 0;
}

/*
 * This function returns true if a particular option appears in a
 * comma-delimited options list
 */
static int opt_in_list(char *opt, char *optlist)
{
	char *s;
	int len;

	if (!optlist)
		return 0;

	len = strlen(opt);
	s = optlist - 1;
	while (1) {
		s = strstr(s + 1, opt);
		if (!s)
			return 0;
		/* neither "opt.." nor "xxx,opt.."? */
		if (s != optlist && s[-1] != ',')
			continue;
		/* neither "..opt" nor "..opt,xxx"? */
		if (s[len] != '\0' && s[len] != ',')
			continue;
		return 1;
	}
}

/* See if the filesystem matches the criteria given by the -t option */
static int fs_match(struct fs_info *fs)
{
	int n, ret, checked_type;
	char *cp;

	if (!G.fs_type_list)
		return 1;

	ret = 0;
	checked_type = 0;
	n = 0;
	while (1) {
		cp = G.fs_type_list[n];
		if (!cp)
			break;
		switch (G.fs_type_flag[n]) {
		case FS_TYPE_FLAG_NORMAL:
			checked_type++;
			if (strcmp(cp, fs->type) == 0)
				ret = 1;
			break;
		case FS_TYPE_FLAG_NEGOPT:
			if (opt_in_list(cp, fs->opts))
				return 0;
			break;
		case FS_TYPE_FLAG_OPT:
			if (!opt_in_list(cp, fs->opts))
				return 0;
			break;
		}
		n++;
	}
	if (checked_type == 0)
		return 1;

	return (G.fs_type_negated ? !ret : ret);
}

/* Check if we should ignore this filesystem. */
static int ignore(struct fs_info *fs)
{
	/*
	 * If the pass number is 0, ignore it.
	 */
	if (fs->passno == 0)
		return 1;

	/*
	 * If a specific fstype is specified, and it doesn't match,
	 * ignore it.
	 */
	if (!fs_match(fs))
		return 1;

	/* Are we ignoring this type? */
	if (index_in_strings(ignored_types, fs->type) >= 0)
		return 1;

	/* We can and want to check this file system type. */
	return 0;
}

/* Check all file systems, using the /etc/fstab table. */
static int check_all(void)
{
	struct fs_info *fs;
	int status = EXIT_OK;
	smallint not_done_yet;
	smallint pass_done;
	int passno;

	if (G.verbose)
		puts("Checking all filesystems");

	/*
	 * Do an initial scan over the filesystem; mark filesystems
	 * which should be ignored as done, and resolve any "auto"
	 * filesystem types (done as a side-effect of calling ignore()).
	 */
	for (fs = G.filesys_info; fs; fs = fs->next)
		if (ignore(fs))
			fs->flags |= FLAG_DONE;

	/*
	 * Find and check the root filesystem.
	 */
	if (!G.parallel_root) {
		for (fs = G.filesys_info; fs; fs = fs->next) {
			if (LONE_CHAR(fs->mountpt, '/')) {
				if (!G.skip_root && !ignore(fs)) {
					fsck_device(fs /*, 1*/);
					status |= wait_many(FLAG_WAIT_ALL);
					if (status > EXIT_NONDESTRUCT)
						return status;
				}
				fs->flags |= FLAG_DONE;
				break;
			}
		}
	}
	/*
	 * This is for the bone-headed user who has root
	 * filesystem listed twice.
	 * "Skip root" will skip _all_ root entries.
	 */
	if (G.skip_root)
		for (fs = G.filesys_info; fs; fs = fs->next)
			if (LONE_CHAR(fs->mountpt, '/'))
				fs->flags |= FLAG_DONE;

	not_done_yet = 1;
	passno = 1;
	while (not_done_yet) {
		not_done_yet = 0;
		pass_done = 1;

		for (fs = G.filesys_info; fs; fs = fs->next) {
			if (bb_got_signal)
				break;
			if (fs->flags & FLAG_DONE)
				continue;
			/*
			 * If the filesystem's pass number is higher
			 * than the current pass number, then we didn't
			 * do it yet.
			 */
			if (fs->passno > passno) {
				not_done_yet = 1;
				continue;
			}
			/*
			 * If a filesystem on a particular device has
			 * already been spawned, then we need to defer
			 * this to another pass.
			 */
			if (device_already_active(fs->device)) {
				pass_done = 0;
				continue;
			}
			/*
			 * Spawn off the fsck process
			 */
			fsck_device(fs /*, G.serialize*/);
			fs->flags |= FLAG_DONE;

			/*
			 * Only do one filesystem at a time, or if we
			 * have a limit on the number of fsck's extant
			 * at one time, apply that limit.
			 */
			if (G.serialize
			 || (G.num_running >= G.max_running)
			) {
				pass_done = 0;
				break;
			}
		}
		if (bb_got_signal)
			break;
		if (G.verbose > 1)
			printf("--waiting-- (pass %d)\n", passno);
		status |= wait_many(pass_done ? FLAG_WAIT_ALL :
				FLAG_WAIT_ATLEAST_ONE);
		if (pass_done) {
			if (G.verbose > 1)
				puts("----------------------------------");
			passno++;
		} else
			not_done_yet = 1;
	}
	kill_all_if_got_signal();
	status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
	return status;
}

/*
 * Deal with the fsck -t argument.
 * Huh, for mount "-t novfat,nfs" means "neither vfat nor nfs"!
 * Why here we require "-t novfat,nonfs" ??
 */
static void compile_fs_type(char *fs_type)
{
	char *s;
	int num = 2;
	smallint negate;

	s = fs_type;
	while ((s = strchr(s, ','))) {
		num++;
		s++;
	}

	G.fs_type_list = xzalloc(num * sizeof(G.fs_type_list[0]));
	G.fs_type_flag = xzalloc(num * sizeof(G.fs_type_flag[0]));
	G.fs_type_negated = -1; /* not yet known is it negated or not */

	num = 0;
	s = fs_type;
	while (1) {
		char *comma;

		negate = 0;
		if (s[0] == 'n' && s[1] == 'o') { /* "no.." */
			s += 2;
			negate = 1;
		} else if (s[0] == '!') {
			s++;
			negate = 1;
		}

		if (strcmp(s, "loop") == 0)
			/* loop is really short-hand for opts=loop */
			goto loop_special_case;
		if (is_prefixed_with(s, "opts=")) {
			s += 5;
 loop_special_case:
			G.fs_type_flag[num] = negate ? FS_TYPE_FLAG_NEGOPT : FS_TYPE_FLAG_OPT;
		} else {
			if (G.fs_type_negated == -1)
				G.fs_type_negated = negate;
			if (G.fs_type_negated != negate)
				bb_simple_error_msg_and_die(
"either all or none of the filesystem types passed to -t must be prefixed "
"with 'no' or '!'");
		}
		comma = strchrnul(s, ',');
		G.fs_type_list[num++] = xstrndup(s, comma-s);
		if (*comma == '\0')
			break;
		s = comma + 1;
	}
}

static char **new_args(void)
{
	G.args = xrealloc_vector(G.args, 2, G.num_args);
	return &G.args[G.num_args++];
}

int fsck_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fsck_main(int argc UNUSED_PARAM, char **argv)
{
	int i, status;
	/*int interactive;*/
	struct fs_info *fs;
	const char *fstab;
	char *tmp;
	char **devices;
	int num_devices;
	smallint opts_for_fsck;
	smallint doall;
	smallint notitle;

	INIT_G();

	/* we want wait() to be interruptible */
	signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
	signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);

	setbuf(stdout, NULL);

	opts_for_fsck = doall = notitle = 0;
	devices = NULL;
	num_devices = 0;
	new_args(); /* G.args[0] = NULL, will be replaced by fsck.<type> */
	/* G.instance_list = NULL; - in bss, so already zeroed */

	while (*++argv) {
		int j;
		int optpos;
		char *options;
		char *arg = *argv;

		/* "/dev/blk" or "/path" or "UUID=xxx" or "LABEL=xxx" */
		if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
// FIXME: must check that arg is a blkdev, or resolve
// "/path", "UUID=xxx" or "LABEL=xxx" into block device name
// ("UUID=xxx"/"LABEL=xxx" can probably shifted to fsck.auto duties)
			devices = xrealloc_vector(devices, 2, num_devices);
			devices[num_devices++] = arg;
			continue;
		}

		if (arg[0] != '-' || opts_for_fsck) {
			*new_args() = arg;
			continue;
		}

		if (LONE_CHAR(arg + 1, '-')) { /* "--" ? */
			opts_for_fsck = 1;
			continue;
		}

		optpos = 0;
		options = NULL;
		for (j = 1; arg[j]; j++) {
			switch (arg[j]) {
			case 'A':
				doall = 1;
				break;
#if DO_PROGRESS_INDICATOR
			case 'C':
				progress = 1;
				if (arg[++j]) { /* -Cn */
					progress_fd = xatoi_positive(&arg[j]);
					goto next_arg;
				}
				/* -C n */
				if (!*++argv)
					bb_show_usage();
				progress_fd = xatoi_positive(*argv);
				goto next_arg;
#endif
			case 'V':
				G.verbose++;
				break;
			case 'N':
				G.noexecute = 1;
				break;
			case 'R':
				G.skip_root = 1;
				break;
			case 'T':
				notitle = 1;
				break;
/*			case 'M':
				like_mount = 1;
				break; */
			case 'P':
				G.parallel_root = 1;
				break;
			case 's':
				G.serialize = 1;
				break;
			case 't':
				if (G.fstype)
					bb_show_usage();
				if (arg[++j])
					tmp = &arg[j];
				else if (*++argv)
					tmp = *argv;
				else
					bb_show_usage();
				G.fstype = xstrdup(tmp);
				compile_fs_type(G.fstype);
				goto next_arg;
			case '?':
				bb_show_usage();
				break;
			default:
				optpos++;
				/* one extra for '\0' */
				options = xrealloc(options, optpos + 2);
				options[optpos] = arg[j];
				break;
			}
		}
 next_arg:
		if (optpos) {
			options[0] = '-';
			options[optpos + 1] = '\0';
			*new_args() = options;
		}
	}
	if (getenv("FSCK_FORCE_ALL_PARALLEL"))
		G.force_all_parallel = 1;
	tmp = getenv("FSCK_MAX_INST");
	G.max_running = INT_MAX;
	if (tmp)
		G.max_running = xatoi(tmp);
	new_args(); /* G.args[G.num_args - 2] will be replaced by <device> */
	new_args(); /* G.args[G.num_args - 1] is the last, NULL element */

	if (!notitle)
		puts("fsck (busybox "BB_VER")");

	/* Even plain "fsck /dev/hda1" needs fstab to get fs type,
	 * so we are scanning it anyway */
	fstab = getenv("FSTAB_FILE");
	if (!fstab)
		fstab = "/etc/fstab";
	load_fs_info(fstab);

	/*interactive = (num_devices == 1) | G.serialize;*/

	if (num_devices == 0)
		/*interactive =*/ G.serialize = doall = 1;
	if (doall)
		return check_all();

	status = 0;
	for (i = 0; i < num_devices; i++) {
		if (bb_got_signal) {
			kill_all_if_got_signal();
			break;
		}

		fs = lookup(devices[i]);
		if (!fs)
			fs = create_fs_device(devices[i], "", "auto", NULL, -1);
		fsck_device(fs /*, interactive */);

		if (G.serialize
		 || (G.num_running >= G.max_running)
		) {
			int exit_status = wait_one(0);
			if (exit_status >= 0)
				status |= exit_status;
			if (G.verbose > 1)
				puts("----------------------------------");
		}
	}
	status |= wait_many(FLAG_WAIT_ALL);
	return status;
}