source: MondoRescue/branches/3.2/mindi-busybox/e2fsprogs/fsck.c@ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 10 years ago
  • Update mindi-busybox to 1.21.1
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1/* vi: set sw=4 ts=4: */
2/*
3 * fsck --- A generic, parallelizing front-end for the fsck program.
4 * It will automatically try to run fsck programs in parallel if the
5 * devices are on separate spindles. It is based on the same ideas as
6 * the generic front end for fsck by David Engel and Fred van Kempen,
7 * but it has been completely rewritten from scratch to support
8 * parallel execution.
9 *
10 * Written by Theodore Ts'o, <tytso@mit.edu>
11 *
12 * Miquel van Smoorenburg (miquels@drinkel.ow.org) 20-Oct-1994:
13 * o Changed -t fstype to behave like with mount when -A (all file
14 * systems) or -M (like mount) is specified.
15 * o fsck looks if it can find the fsck.type program to decide
16 * if it should ignore the fs type. This way more fsck programs
17 * can be added without changing this front-end.
18 * o -R flag skip root file system.
19 *
20 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
21 * 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o.
22 *
23 * Licensed under GPLv2, see file LICENSE in this source tree.
24 */
25
26/* All filesystem specific hooks have been removed.
27 * If filesystem cannot be determined, we will execute
28 * "fsck.auto". Currently this also happens if you specify
29 * UUID=xxx or LABEL=xxx as an object to check.
30 * Detection code for that is also probably has to be in fsck.auto.
31 *
32 * In other words, this is _really_ is just a driver program which
33 * spawns actual fsck.something for each filesystem to check.
34 * It doesn't guess filesystem types from on-disk format.
35 */
36
37//usage:#define fsck_trivial_usage
38//usage: "[-ANPRTV] [-C FD] [-t FSTYPE] [FS_OPTS] [BLOCKDEV]..."
39//usage:#define fsck_full_usage "\n\n"
40//usage: "Check and repair filesystems\n"
41//usage: "\n -A Walk /etc/fstab and check all filesystems"
42//usage: "\n -N Don't execute, just show what would be done"
43//usage: "\n -P With -A, check filesystems in parallel"
44//usage: "\n -R With -A, skip the root filesystem"
45//usage: "\n -T Don't show title on startup"
46//usage: "\n -V Verbose"
47//usage: "\n -C n Write status information to specified filedescriptor"
48//usage: "\n -t TYPE List of filesystem types to check"
49
50#include "libbb.h"
51
52/* "progress indicator" code is somewhat buggy and ext[23] specific.
53 * We should be filesystem agnostic. IOW: there should be a well-defined
54 * API for fsck.something, NOT ad-hoc hacks in generic fsck. */
55#define DO_PROGRESS_INDICATOR 0
56
57/* fsck 1.41.4 (27-Jan-2009) manpage says:
58 * 0 - No errors
59 * 1 - File system errors corrected
60 * 2 - System should be rebooted
61 * 4 - File system errors left uncorrected
62 * 8 - Operational error
63 * 16 - Usage or syntax error
64 * 32 - Fsck canceled by user request
65 * 128 - Shared library error
66 */
67#define EXIT_OK 0
68#define EXIT_NONDESTRUCT 1
69#define EXIT_DESTRUCT 2
70#define EXIT_UNCORRECTED 4
71#define EXIT_ERROR 8
72#define EXIT_USAGE 16
73#define FSCK_CANCELED 32 /* Aborted with a signal or ^C */
74
75/*
76 * Internal structure for mount table entries.
77 */
78struct fs_info {
79 struct fs_info *next;
80 char *device;
81 char *mountpt;
82 char *type;
83 char *opts;
84 int passno;
85 int flags;
86};
87
88#define FLAG_DONE 1
89#define FLAG_PROGRESS 2
90/*
91 * Structure to allow exit codes to be stored
92 */
93struct fsck_instance {
94 struct fsck_instance *next;
95 int pid;
96 int flags;
97#if DO_PROGRESS_INDICATOR
98 time_t start_time;
99#endif
100 char *prog;
101 char *device;
102 char *base_device; /* /dev/hda for /dev/hdaN etc */
103};
104
105static const char ignored_types[] ALIGN1 =
106 "ignore\0"
107 "iso9660\0"
108 "nfs\0"
109 "proc\0"
110 "sw\0"
111 "swap\0"
112 "tmpfs\0"
113 "devpts\0";
114
115#if 0
116static const char really_wanted[] ALIGN1 =
117 "minix\0"
118 "ext2\0"
119 "ext3\0"
120 "jfs\0"
121 "reiserfs\0"
122 "xiafs\0"
123 "xfs\0";
124#endif
125
126#define BASE_MD "/dev/md"
127
128static char **args;
129static int num_args;
130static int verbose;
131
132#define FS_TYPE_FLAG_NORMAL 0
133#define FS_TYPE_FLAG_OPT 1
134#define FS_TYPE_FLAG_NEGOPT 2
135static char **fs_type_list;
136static uint8_t *fs_type_flag;
137static smallint fs_type_negated;
138
139static smallint noexecute;
140static smallint serialize;
141static smallint skip_root;
142/* static smallint like_mount; */
143static smallint parallel_root;
144static smallint force_all_parallel;
145
146#if DO_PROGRESS_INDICATOR
147static smallint progress;
148static int progress_fd;
149#endif
150
151static int num_running;
152static int max_running;
153static char *fstype;
154static struct fs_info *filesys_info;
155static struct fs_info *filesys_last;
156static struct fsck_instance *instance_list;
157
158/*
159 * Return the "base device" given a particular device; this is used to
160 * assure that we only fsck one partition on a particular drive at any
161 * one time. Otherwise, the disk heads will be seeking all over the
162 * place. If the base device cannot be determined, return NULL.
163 *
164 * The base_device() function returns an allocated string which must
165 * be freed.
166 */
167#if ENABLE_FEATURE_DEVFS
168/*
169 * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
170 * pathames.
171 */
172static const char *const devfs_hier[] = {
173 "host", "bus", "target", "lun", NULL
174};
175#endif
176
177static char *base_device(const char *device)
178{
179 char *str, *cp;
180#if ENABLE_FEATURE_DEVFS
181 const char *const *hier;
182 const char *disk;
183 int len;
184#endif
185 str = xstrdup(device);
186
187 /* Skip over "/dev/"; if it's not present, give up */
188 cp = skip_dev_pfx(str);
189 if (cp == str)
190 goto errout;
191
192 /*
193 * For md devices, we treat them all as if they were all
194 * on one disk, since we don't know how to parallelize them.
195 */
196 if (cp[0] == 'm' && cp[1] == 'd') {
197 cp[2] = 0;
198 return str;
199 }
200
201 /* Handle DAC 960 devices */
202 if (strncmp(cp, "rd/", 3) == 0) {
203 cp += 3;
204 if (cp[0] != 'c' || !isdigit(cp[1])
205 || cp[2] != 'd' || !isdigit(cp[3]))
206 goto errout;
207 cp[4] = 0;
208 return str;
209 }
210
211 /* Now let's handle /dev/hd* and /dev/sd* devices.... */
212 if ((cp[0] == 'h' || cp[0] == 's') && cp[1] == 'd') {
213 cp += 2;
214 /* If there's a single number after /dev/hd, skip it */
215 if (isdigit(*cp))
216 cp++;
217 /* What follows must be an alpha char, or give up */
218 if (!isalpha(*cp))
219 goto errout;
220 cp[1] = 0;
221 return str;
222 }
223
224#if ENABLE_FEATURE_DEVFS
225 /* Now let's handle devfs (ugh) names */
226 len = 0;
227 if (strncmp(cp, "ide/", 4) == 0)
228 len = 4;
229 if (strncmp(cp, "scsi/", 5) == 0)
230 len = 5;
231 if (len) {
232 cp += len;
233 /*
234 * Now we proceed down the expected devfs hierarchy.
235 * i.e., .../host1/bus2/target3/lun4/...
236 * If we don't find the expected token, followed by
237 * some number of digits at each level, abort.
238 */
239 for (hier = devfs_hier; *hier; hier++) {
240 len = strlen(*hier);
241 if (strncmp(cp, *hier, len) != 0)
242 goto errout;
243 cp += len;
244 while (*cp != '/' && *cp != 0) {
245 if (!isdigit(*cp))
246 goto errout;
247 cp++;
248 }
249 cp++;
250 }
251 cp[-1] = 0;
252 return str;
253 }
254
255 /* Now handle devfs /dev/disc or /dev/disk names */
256 disk = 0;
257 if (strncmp(cp, "discs/", 6) == 0)
258 disk = "disc";
259 else if (strncmp(cp, "disks/", 6) == 0)
260 disk = "disk";
261 if (disk) {
262 cp += 6;
263 if (strncmp(cp, disk, 4) != 0)
264 goto errout;
265 cp += 4;
266 while (*cp != '/' && *cp != 0) {
267 if (!isdigit(*cp))
268 goto errout;
269 cp++;
270 }
271 *cp = 0;
272 return str;
273 }
274#endif
275 errout:
276 free(str);
277 return NULL;
278}
279
280static void free_instance(struct fsck_instance *p)
281{
282 free(p->prog);
283 free(p->device);
284 free(p->base_device);
285 free(p);
286}
287
288static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
289 const char *type, const char *opts,
290 int passno)
291{
292 struct fs_info *fs;
293
294 fs = xzalloc(sizeof(*fs));
295 fs->device = xstrdup(device);
296 fs->mountpt = xstrdup(mntpnt);
297 if (strchr(type, ','))
298 type = (char *)"auto";
299 fs->type = xstrdup(type);
300 fs->opts = xstrdup(opts ? opts : "");
301 fs->passno = passno < 0 ? 1 : passno;
302 /*fs->flags = 0; */
303 /*fs->next = NULL; */
304
305 if (!filesys_info)
306 filesys_info = fs;
307 else
308 filesys_last->next = fs;
309 filesys_last = fs;
310
311 return fs;
312}
313
314/* Load the filesystem database from /etc/fstab */
315static void load_fs_info(const char *filename)
316{
317 FILE *fstab;
318 struct mntent mte;
319
320 fstab = setmntent(filename, "r");
321 if (!fstab) {
322 bb_perror_msg("can't read '%s'", filename);
323 return;
324 }
325
326 // Loop through entries
327 while (getmntent_r(fstab, &mte, bb_common_bufsiz1, COMMON_BUFSIZE)) {
328 //bb_info_msg("CREATE[%s][%s][%s][%s][%d]", mte.mnt_fsname, mte.mnt_dir,
329 // mte.mnt_type, mte.mnt_opts,
330 // mte.mnt_passno);
331 create_fs_device(mte.mnt_fsname, mte.mnt_dir,
332 mte.mnt_type, mte.mnt_opts,
333 mte.mnt_passno);
334 }
335 endmntent(fstab);
336}
337
338/* Lookup filesys in /etc/fstab and return the corresponding entry. */
339static struct fs_info *lookup(char *filesys)
340{
341 struct fs_info *fs;
342
343 for (fs = filesys_info; fs; fs = fs->next) {
344 if (strcmp(filesys, fs->device) == 0
345 || (fs->mountpt && strcmp(filesys, fs->mountpt) == 0)
346 )
347 break;
348 }
349
350 return fs;
351}
352
353#if DO_PROGRESS_INDICATOR
354static int progress_active(void)
355{
356 struct fsck_instance *inst;
357
358 for (inst = instance_list; inst; inst = inst->next) {
359 if (inst->flags & FLAG_DONE)
360 continue;
361 if (inst->flags & FLAG_PROGRESS)
362 return 1;
363 }
364 return 0;
365}
366#endif
367
368
369/*
370 * Send a signal to all outstanding fsck child processes
371 */
372static void kill_all_if_got_signal(void)
373{
374 static smallint kill_sent;
375
376 struct fsck_instance *inst;
377
378 if (!bb_got_signal || kill_sent)
379 return;
380
381 for (inst = instance_list; inst; inst = inst->next) {
382 if (inst->flags & FLAG_DONE)
383 continue;
384 kill(inst->pid, SIGTERM);
385 }
386 kill_sent = 1;
387}
388
389/*
390 * Wait for one child process to exit; when it does, unlink it from
391 * the list of executing child processes, free, and return its exit status.
392 * If there is no exited child, return -1.
393 */
394static int wait_one(int flags)
395{
396 int status;
397 int sig;
398 struct fsck_instance *inst, *prev;
399 pid_t pid;
400
401 if (!instance_list)
402 return -1;
403 /* if (noexecute) { already returned -1; } */
404
405 while (1) {
406 pid = waitpid(-1, &status, flags);
407 kill_all_if_got_signal();
408 if (pid == 0) /* flags == WNOHANG and no children exited */
409 return -1;
410 if (pid < 0) {
411 if (errno == EINTR)
412 continue;
413 if (errno == ECHILD) { /* paranoia */
414 bb_error_msg("wait: no more children");
415 return -1;
416 }
417 bb_perror_msg("wait");
418 continue;
419 }
420 prev = NULL;
421 inst = instance_list;
422 do {
423 if (inst->pid == pid)
424 goto child_died;
425 prev = inst;
426 inst = inst->next;
427 } while (inst);
428 }
429 child_died:
430
431 if (WIFEXITED(status))
432 status = WEXITSTATUS(status);
433 else if (WIFSIGNALED(status)) {
434 sig = WTERMSIG(status);
435 status = EXIT_UNCORRECTED;
436 if (sig != SIGINT) {
437 printf("Warning: %s %s terminated "
438 "by signal %d\n",
439 inst->prog, inst->device, sig);
440 status = EXIT_ERROR;
441 }
442 } else {
443 printf("%s %s: status is %x, should never happen\n",
444 inst->prog, inst->device, status);
445 status = EXIT_ERROR;
446 }
447
448#if DO_PROGRESS_INDICATOR
449 if (progress && (inst->flags & FLAG_PROGRESS) && !progress_active()) {
450 struct fsck_instance *inst2;
451 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
452 if (inst2->flags & FLAG_DONE)
453 continue;
454 if (strcmp(inst2->type, "ext2") != 0
455 && strcmp(inst2->type, "ext3") != 0
456 ) {
457 continue;
458 }
459 /* ext[23], we will send USR1
460 * (request to start displaying progress bar)
461 *
462 * If we've just started the fsck, wait a tiny
463 * bit before sending the kill, to give it
464 * time to set up the signal handler
465 */
466 if (inst2->start_time >= time(NULL) - 1)
467 sleep(1);
468 kill(inst2->pid, SIGUSR1);
469 inst2->flags |= FLAG_PROGRESS;
470 break;
471 }
472 }
473#endif
474
475 if (prev)
476 prev->next = inst->next;
477 else
478 instance_list = inst->next;
479 if (verbose > 1)
480 printf("Finished with %s (exit status %d)\n",
481 inst->device, status);
482 num_running--;
483 free_instance(inst);
484
485 return status;
486}
487
488/*
489 * Wait until all executing child processes have exited; return the
490 * logical OR of all of their exit code values.
491 */
492#define FLAG_WAIT_ALL 0
493#define FLAG_WAIT_ATLEAST_ONE WNOHANG
494static int wait_many(int flags)
495{
496 int exit_status;
497 int global_status = 0;
498 int wait_flags = 0;
499
500 while ((exit_status = wait_one(wait_flags)) != -1) {
501 global_status |= exit_status;
502 wait_flags |= flags;
503 }
504 return global_status;
505}
506
507/*
508 * Execute a particular fsck program, and link it into the list of
509 * child processes we are waiting for.
510 */
511static void execute(const char *type, const char *device,
512 const char *mntpt /*, int interactive */)
513{
514 int i;
515 struct fsck_instance *inst;
516 pid_t pid;
517
518 args[0] = xasprintf("fsck.%s", type);
519
520#if DO_PROGRESS_INDICATOR
521 if (progress && !progress_active()) {
522 if (strcmp(type, "ext2") == 0
523 || strcmp(type, "ext3") == 0
524 ) {
525 args[XXX] = xasprintf("-C%d", progress_fd); /* 1 */
526 inst->flags |= FLAG_PROGRESS;
527 }
528 }
529#endif
530
531 args[num_args - 2] = (char*)device;
532 /* args[num_args - 1] = NULL; - already is */
533
534 if (verbose || noexecute) {
535 printf("[%s (%d) -- %s]", args[0], num_running,
536 mntpt ? mntpt : device);
537 for (i = 0; args[i]; i++)
538 printf(" %s", args[i]);
539 bb_putchar('\n');
540 }
541
542 /* Fork and execute the correct program. */
543 pid = -1;
544 if (!noexecute) {
545 pid = spawn(args);
546 if (pid < 0)
547 bb_simple_perror_msg(args[0]);
548 }
549
550#if DO_PROGRESS_INDICATOR
551 free(args[XXX]);
552#endif
553
554 /* No child, so don't record an instance */
555 if (pid <= 0) {
556 free(args[0]);
557 return;
558 }
559
560 inst = xzalloc(sizeof(*inst));
561 inst->pid = pid;
562 inst->prog = args[0];
563 inst->device = xstrdup(device);
564 inst->base_device = base_device(device);
565#if DO_PROGRESS_INDICATOR
566 inst->start_time = time(NULL);
567#endif
568
569 /* Add to the list of running fsck's.
570 * (was adding to the end, but adding to the front is simpler...) */
571 inst->next = instance_list;
572 instance_list = inst;
573}
574
575/*
576 * Run the fsck program on a particular device
577 *
578 * If the type is specified using -t, and it isn't prefixed with "no"
579 * (as in "noext2") and only one filesystem type is specified, then
580 * use that type regardless of what is specified in /etc/fstab.
581 *
582 * If the type isn't specified by the user, then use either the type
583 * specified in /etc/fstab, or "auto".
584 */
585static void fsck_device(struct fs_info *fs /*, int interactive */)
586{
587 const char *type;
588
589 if (strcmp(fs->type, "auto") != 0) {
590 type = fs->type;
591 if (verbose > 2)
592 bb_info_msg("using filesystem type '%s' %s",
593 type, "from fstab");
594 } else if (fstype
595 && (fstype[0] != 'n' || fstype[1] != 'o') /* != "no" */
596 && strncmp(fstype, "opts=", 5) != 0
597 && strncmp(fstype, "loop", 4) != 0
598 && !strchr(fstype, ',')
599 ) {
600 type = fstype;
601 if (verbose > 2)
602 bb_info_msg("using filesystem type '%s' %s",
603 type, "from -t");
604 } else {
605 type = "auto";
606 if (verbose > 2)
607 bb_info_msg("using filesystem type '%s' %s",
608 type, "(default)");
609 }
610
611 num_running++;
612 execute(type, fs->device, fs->mountpt /*, interactive */);
613}
614
615/*
616 * Returns TRUE if a partition on the same disk is already being
617 * checked.
618 */
619static int device_already_active(char *device)
620{
621 struct fsck_instance *inst;
622 char *base;
623
624 if (force_all_parallel)
625 return 0;
626
627#ifdef BASE_MD
628 /* Don't check a soft raid disk with any other disk */
629 if (instance_list
630 && (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1)
631 || !strncmp(device, BASE_MD, sizeof(BASE_MD)-1))
632 ) {
633 return 1;
634 }
635#endif
636
637 base = base_device(device);
638 /*
639 * If we don't know the base device, assume that the device is
640 * already active if there are any fsck instances running.
641 */
642 if (!base)
643 return (instance_list != NULL);
644
645 for (inst = instance_list; inst; inst = inst->next) {
646 if (!inst->base_device || !strcmp(base, inst->base_device)) {
647 free(base);
648 return 1;
649 }
650 }
651
652 free(base);
653 return 0;
654}
655
656/*
657 * This function returns true if a particular option appears in a
658 * comma-delimited options list
659 */
660static int opt_in_list(char *opt, char *optlist)
661{
662 char *s;
663 int len;
664
665 if (!optlist)
666 return 0;
667
668 len = strlen(opt);
669 s = optlist - 1;
670 while (1) {
671 s = strstr(s + 1, opt);
672 if (!s)
673 return 0;
674 /* neither "opt.." nor "xxx,opt.."? */
675 if (s != optlist && s[-1] != ',')
676 continue;
677 /* neither "..opt" nor "..opt,xxx"? */
678 if (s[len] != '\0' && s[len] != ',')
679 continue;
680 return 1;
681 }
682}
683
684/* See if the filesystem matches the criteria given by the -t option */
685static int fs_match(struct fs_info *fs)
686{
687 int n, ret, checked_type;
688 char *cp;
689
690 if (!fs_type_list)
691 return 1;
692
693 ret = 0;
694 checked_type = 0;
695 n = 0;
696 while (1) {
697 cp = fs_type_list[n];
698 if (!cp)
699 break;
700 switch (fs_type_flag[n]) {
701 case FS_TYPE_FLAG_NORMAL:
702 checked_type++;
703 if (strcmp(cp, fs->type) == 0)
704 ret = 1;
705 break;
706 case FS_TYPE_FLAG_NEGOPT:
707 if (opt_in_list(cp, fs->opts))
708 return 0;
709 break;
710 case FS_TYPE_FLAG_OPT:
711 if (!opt_in_list(cp, fs->opts))
712 return 0;
713 break;
714 }
715 n++;
716 }
717 if (checked_type == 0)
718 return 1;
719
720 return (fs_type_negated ? !ret : ret);
721}
722
723/* Check if we should ignore this filesystem. */
724static int ignore(struct fs_info *fs)
725{
726 /*
727 * If the pass number is 0, ignore it.
728 */
729 if (fs->passno == 0)
730 return 1;
731
732 /*
733 * If a specific fstype is specified, and it doesn't match,
734 * ignore it.
735 */
736 if (!fs_match(fs))
737 return 1;
738
739 /* Are we ignoring this type? */
740 if (index_in_strings(ignored_types, fs->type) >= 0)
741 return 1;
742
743 /* We can and want to check this file system type. */
744 return 0;
745}
746
747/* Check all file systems, using the /etc/fstab table. */
748static int check_all(void)
749{
750 struct fs_info *fs;
751 int status = EXIT_OK;
752 smallint not_done_yet;
753 smallint pass_done;
754 int passno;
755
756 if (verbose)
757 puts("Checking all filesystems");
758
759 /*
760 * Do an initial scan over the filesystem; mark filesystems
761 * which should be ignored as done, and resolve any "auto"
762 * filesystem types (done as a side-effect of calling ignore()).
763 */
764 for (fs = filesys_info; fs; fs = fs->next)
765 if (ignore(fs))
766 fs->flags |= FLAG_DONE;
767
768 /*
769 * Find and check the root filesystem.
770 */
771 if (!parallel_root) {
772 for (fs = filesys_info; fs; fs = fs->next) {
773 if (LONE_CHAR(fs->mountpt, '/')) {
774 if (!skip_root && !ignore(fs)) {
775 fsck_device(fs /*, 1*/);
776 status |= wait_many(FLAG_WAIT_ALL);
777 if (status > EXIT_NONDESTRUCT)
778 return status;
779 }
780 fs->flags |= FLAG_DONE;
781 break;
782 }
783 }
784 }
785 /*
786 * This is for the bone-headed user who has root
787 * filesystem listed twice.
788 * "Skip root" will skip _all_ root entries.
789 */
790 if (skip_root)
791 for (fs = filesys_info; fs; fs = fs->next)
792 if (LONE_CHAR(fs->mountpt, '/'))
793 fs->flags |= FLAG_DONE;
794
795 not_done_yet = 1;
796 passno = 1;
797 while (not_done_yet) {
798 not_done_yet = 0;
799 pass_done = 1;
800
801 for (fs = filesys_info; fs; fs = fs->next) {
802 if (bb_got_signal)
803 break;
804 if (fs->flags & FLAG_DONE)
805 continue;
806 /*
807 * If the filesystem's pass number is higher
808 * than the current pass number, then we didn't
809 * do it yet.
810 */
811 if (fs->passno > passno) {
812 not_done_yet = 1;
813 continue;
814 }
815 /*
816 * If a filesystem on a particular device has
817 * already been spawned, then we need to defer
818 * this to another pass.
819 */
820 if (device_already_active(fs->device)) {
821 pass_done = 0;
822 continue;
823 }
824 /*
825 * Spawn off the fsck process
826 */
827 fsck_device(fs /*, serialize*/);
828 fs->flags |= FLAG_DONE;
829
830 /*
831 * Only do one filesystem at a time, or if we
832 * have a limit on the number of fsck's extant
833 * at one time, apply that limit.
834 */
835 if (serialize
836 || (max_running && (num_running >= max_running))
837 ) {
838 pass_done = 0;
839 break;
840 }
841 }
842 if (bb_got_signal)
843 break;
844 if (verbose > 1)
845 printf("--waiting-- (pass %d)\n", passno);
846 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
847 FLAG_WAIT_ATLEAST_ONE);
848 if (pass_done) {
849 if (verbose > 1)
850 puts("----------------------------------");
851 passno++;
852 } else
853 not_done_yet = 1;
854 }
855 kill_all_if_got_signal();
856 status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
857 return status;
858}
859
860/*
861 * Deal with the fsck -t argument.
862 * Huh, for mount "-t novfat,nfs" means "neither vfat nor nfs"!
863 * Why here we require "-t novfat,nonfs" ??
864 */
865static void compile_fs_type(char *fs_type)
866{
867 char *s;
868 int num = 2;
869 smallint negate;
870
871 s = fs_type;
872 while ((s = strchr(s, ','))) {
873 num++;
874 s++;
875 }
876
877 fs_type_list = xzalloc(num * sizeof(fs_type_list[0]));
878 fs_type_flag = xzalloc(num * sizeof(fs_type_flag[0]));
879 fs_type_negated = -1; /* not yet known is it negated or not */
880
881 num = 0;
882 s = fs_type;
883 while (1) {
884 char *comma;
885
886 negate = 0;
887 if (s[0] == 'n' && s[1] == 'o') { /* "no.." */
888 s += 2;
889 negate = 1;
890 } else if (s[0] == '!') {
891 s++;
892 negate = 1;
893 }
894
895 if (strcmp(s, "loop") == 0)
896 /* loop is really short-hand for opts=loop */
897 goto loop_special_case;
898 if (strncmp(s, "opts=", 5) == 0) {
899 s += 5;
900 loop_special_case:
901 fs_type_flag[num] = negate ? FS_TYPE_FLAG_NEGOPT : FS_TYPE_FLAG_OPT;
902 } else {
903 if (fs_type_negated == -1)
904 fs_type_negated = negate;
905 if (fs_type_negated != negate)
906 bb_error_msg_and_die(
907"either all or none of the filesystem types passed to -t must be prefixed "
908"with 'no' or '!'");
909 }
910 comma = strchr(s, ',');
911 fs_type_list[num++] = comma ? xstrndup(s, comma-s) : xstrdup(s);
912 if (!comma)
913 break;
914 s = comma + 1;
915 }
916}
917
918static char **new_args(void)
919{
920 args = xrealloc_vector(args, 2, num_args);
921 return &args[num_args++];
922}
923
924int fsck_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
925int fsck_main(int argc UNUSED_PARAM, char **argv)
926{
927 int i, status;
928 /*int interactive;*/
929 struct fs_info *fs;
930 const char *fstab;
931 char *tmp;
932 char **devices;
933 int num_devices;
934 smallint opts_for_fsck;
935 smallint doall;
936 smallint notitle;
937
938 /* we want wait() to be interruptible */
939 signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
940 signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
941
942 setbuf(stdout, NULL);
943
944 opts_for_fsck = doall = notitle = 0;
945 devices = NULL;
946 num_devices = 0;
947 new_args(); /* args[0] = NULL, will be replaced by fsck.<type> */
948 /* instance_list = NULL; - in bss, so already zeroed */
949
950 while (*++argv) {
951 int j;
952 int optpos;
953 char *options;
954 char *arg = *argv;
955
956 /* "/dev/blk" or "/path" or "UUID=xxx" or "LABEL=xxx" */
957 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
958// FIXME: must check that arg is a blkdev, or resolve
959// "/path", "UUID=xxx" or "LABEL=xxx" into block device name
960// ("UUID=xxx"/"LABEL=xxx" can probably shifted to fsck.auto duties)
961 devices = xrealloc_vector(devices, 2, num_devices);
962 devices[num_devices++] = arg;
963 continue;
964 }
965
966 if (arg[0] != '-' || opts_for_fsck) {
967 *new_args() = arg;
968 continue;
969 }
970
971 if (LONE_CHAR(arg + 1, '-')) { /* "--" ? */
972 opts_for_fsck = 1;
973 continue;
974 }
975
976 optpos = 0;
977 options = NULL;
978 for (j = 1; arg[j]; j++) {
979 switch (arg[j]) {
980 case 'A':
981 doall = 1;
982 break;
983#if DO_PROGRESS_INDICATOR
984 case 'C':
985 progress = 1;
986 if (arg[++j]) { /* -Cn */
987 progress_fd = xatoi_positive(&arg[j]);
988 goto next_arg;
989 }
990 /* -C n */
991 if (!*++argv)
992 bb_show_usage();
993 progress_fd = xatoi_positive(*argv);
994 goto next_arg;
995#endif
996 case 'V':
997 verbose++;
998 break;
999 case 'N':
1000 noexecute = 1;
1001 break;
1002 case 'R':
1003 skip_root = 1;
1004 break;
1005 case 'T':
1006 notitle = 1;
1007 break;
1008/* case 'M':
1009 like_mount = 1;
1010 break; */
1011 case 'P':
1012 parallel_root = 1;
1013 break;
1014 case 's':
1015 serialize = 1;
1016 break;
1017 case 't':
1018 if (fstype)
1019 bb_show_usage();
1020 if (arg[++j])
1021 tmp = &arg[j];
1022 else if (*++argv)
1023 tmp = *argv;
1024 else
1025 bb_show_usage();
1026 fstype = xstrdup(tmp);
1027 compile_fs_type(fstype);
1028 goto next_arg;
1029 case '?':
1030 bb_show_usage();
1031 break;
1032 default:
1033 optpos++;
1034 /* one extra for '\0' */
1035 options = xrealloc(options, optpos + 2);
1036 options[optpos] = arg[j];
1037 break;
1038 }
1039 }
1040 next_arg:
1041 if (optpos) {
1042 options[0] = '-';
1043 options[optpos + 1] = '\0';
1044 *new_args() = options;
1045 }
1046 }
1047 if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1048 force_all_parallel = 1;
1049 tmp = getenv("FSCK_MAX_INST");
1050 if (tmp)
1051 max_running = xatoi(tmp);
1052 new_args(); /* args[num_args - 2] will be replaced by <device> */
1053 new_args(); /* args[num_args - 1] is the last, NULL element */
1054
1055 if (!notitle)
1056 puts("fsck (busybox "BB_VER", "BB_BT")");
1057
1058 /* Even plain "fsck /dev/hda1" needs fstab to get fs type,
1059 * so we are scanning it anyway */
1060 fstab = getenv("FSTAB_FILE");
1061 if (!fstab)
1062 fstab = "/etc/fstab";
1063 load_fs_info(fstab);
1064
1065 /*interactive = (num_devices == 1) | serialize;*/
1066
1067 if (num_devices == 0)
1068 /*interactive =*/ serialize = doall = 1;
1069 if (doall)
1070 return check_all();
1071
1072 status = 0;
1073 for (i = 0; i < num_devices; i++) {
1074 if (bb_got_signal) {
1075 kill_all_if_got_signal();
1076 break;
1077 }
1078
1079 fs = lookup(devices[i]);
1080 if (!fs)
1081 fs = create_fs_device(devices[i], "", "auto", NULL, -1);
1082 fsck_device(fs /*, interactive */);
1083
1084 if (serialize
1085 || (max_running && (num_running >= max_running))
1086 ) {
1087 int exit_status = wait_one(0);
1088 if (exit_status >= 0)
1089 status |= exit_status;
1090 if (verbose > 1)
1091 puts("----------------------------------");
1092 }
1093 }
1094 status |= wait_many(FLAG_WAIT_ALL);
1095 return status;
1096}
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