source: MondoRescue/branches/3.2/mindi-busybox/e2fsprogs/old_e2fsprogs/fsck.c@ 3232

Last change on this file since 3232 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 27.7 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * pfsck --- 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#include <sys/types.h>
27#include <sys/wait.h>
28#include <sys/stat.h>
29#include <limits.h>
30#include <stdio.h>
31#include <ctype.h>
32#include <string.h>
33#include <time.h>
34#include <stdlib.h>
35#include <errno.h>
36#include <paths.h>
37#include <unistd.h>
38#include <errno.h>
39#include <signal.h>
40
41#include "fsck.h"
42#include "blkid/blkid.h"
43
44#include "e2fsbb.h"
45
46#include "libbb.h"
47
48#ifndef _PATH_MNTTAB
49#define _PATH_MNTTAB "/etc/fstab"
50#endif
51
52/*
53 * fsck.h
54 */
55
56#ifndef DEFAULT_FSTYPE
57#define DEFAULT_FSTYPE "ext2"
58#endif
59
60#define MAX_DEVICES 32
61#define MAX_ARGS 32
62
63/*
64 * Internal structure for mount tabel entries.
65 */
66
67struct fs_info {
68 char *device;
69 char *mountpt;
70 char *type;
71 char *opts;
72 int freq;
73 int passno;
74 int flags;
75 struct fs_info *next;
76};
77
78#define FLAG_DONE 1
79#define FLAG_PROGRESS 2
80
81/*
82 * Structure to allow exit codes to be stored
83 */
84struct fsck_instance {
85 int pid;
86 int flags;
87 int exit_status;
88 time_t start_time;
89 char * prog;
90 char * type;
91 char * device;
92 char * base_device;
93 struct fsck_instance *next;
94};
95
96/*
97 * base_device.c
98 *
99 * Return the "base device" given a particular device; this is used to
100 * assure that we only fsck one partition on a particular drive at any
101 * one time. Otherwise, the disk heads will be seeking all over the
102 * place. If the base device cannot be determined, return NULL.
103 *
104 * The base_device() function returns an allocated string which must
105 * be freed.
106 *
107 */
108
109
110#ifdef CONFIG_FEATURE_DEVFS
111/*
112 * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3
113 * pathames.
114 */
115static const char *const devfs_hier[] = {
116 "host", "bus", "target", "lun", 0
117};
118#endif
119
120static char *base_device(const char *device)
121{
122 char *str, *cp;
123#ifdef CONFIG_FEATURE_DEVFS
124 const char *const *hier;
125 const char *disk;
126 int len;
127#endif
128
129 cp = str = xstrdup(device);
130
131 /* Skip over /dev/; if it's not present, give up. */
132 if (strncmp(cp, "/dev/", 5) != 0)
133 goto errout;
134 cp += 5;
135
136 /*
137 * For md devices, we treat them all as if they were all
138 * on one disk, since we don't know how to parallelize them.
139 */
140 if (cp[0] == 'm' && cp[1] == 'd') {
141 *(cp+2) = 0;
142 return str;
143 }
144
145 /* Handle DAC 960 devices */
146 if (strncmp(cp, "rd/", 3) == 0) {
147 cp += 3;
148 if (cp[0] != 'c' || cp[2] != 'd' ||
149 !isdigit(cp[1]) || !isdigit(cp[3]))
150 goto errout;
151 *(cp+4) = 0;
152 return str;
153 }
154
155 /* Now let's handle /dev/hd* and /dev/sd* devices.... */
156 if ((cp[0] == 'h' || cp[0] == 's') && (cp[1] == 'd')) {
157 cp += 2;
158 /* If there's a single number after /dev/hd, skip it */
159 if (isdigit(*cp))
160 cp++;
161 /* What follows must be an alpha char, or give up */
162 if (!isalpha(*cp))
163 goto errout;
164 *(cp + 1) = 0;
165 return str;
166 }
167
168#ifdef CONFIG_FEATURE_DEVFS
169 /* Now let's handle devfs (ugh) names */
170 len = 0;
171 if (strncmp(cp, "ide/", 4) == 0)
172 len = 4;
173 if (strncmp(cp, "scsi/", 5) == 0)
174 len = 5;
175 if (len) {
176 cp += len;
177 /*
178 * Now we proceed down the expected devfs hierarchy.
179 * i.e., .../host1/bus2/target3/lun4/...
180 * If we don't find the expected token, followed by
181 * some number of digits at each level, abort.
182 */
183 for (hier = devfs_hier; *hier; hier++) {
184 len = strlen(*hier);
185 if (strncmp(cp, *hier, len) != 0)
186 goto errout;
187 cp += len;
188 while (*cp != '/' && *cp != 0) {
189 if (!isdigit(*cp))
190 goto errout;
191 cp++;
192 }
193 cp++;
194 }
195 *(cp - 1) = 0;
196 return str;
197 }
198
199 /* Now handle devfs /dev/disc or /dev/disk names */
200 disk = 0;
201 if (strncmp(cp, "discs/", 6) == 0)
202 disk = "disc";
203 else if (strncmp(cp, "disks/", 6) == 0)
204 disk = "disk";
205 if (disk) {
206 cp += 6;
207 if (strncmp(cp, disk, 4) != 0)
208 goto errout;
209 cp += 4;
210 while (*cp != '/' && *cp != 0) {
211 if (!isdigit(*cp))
212 goto errout;
213 cp++;
214 }
215 *cp = 0;
216 return str;
217 }
218#endif
219
220errout:
221 free(str);
222 return NULL;
223}
224
225
226static const char *const ignored_types[] = {
227 "ignore",
228 "iso9660",
229 "nfs",
230 "proc",
231 "sw",
232 "swap",
233 "tmpfs",
234 "devpts",
235 NULL
236};
237
238static const char *const really_wanted[] = {
239 "minix",
240 "ext2",
241 "ext3",
242 "jfs",
243 "reiserfs",
244 "xiafs",
245 "xfs",
246 NULL
247};
248
249#define BASE_MD "/dev/md"
250
251/*
252 * Global variables for options
253 */
254static char *devices[MAX_DEVICES];
255static char *args[MAX_ARGS];
256static int num_devices, num_args;
257
258static int verbose;
259static int doall;
260static int noexecute;
261static int serialize;
262static int skip_root;
263static int like_mount;
264static int notitle;
265static int parallel_root;
266static int progress;
267static int progress_fd;
268static int force_all_parallel;
269static int num_running;
270static int max_running;
271static volatile int cancel_requested;
272static int kill_sent;
273static char *fstype;
274static struct fs_info *filesys_info, *filesys_last;
275static struct fsck_instance *instance_list;
276static char *fsck_path;
277static blkid_cache cache;
278
279static char *string_copy(const char *s)
280{
281 char *ret;
282
283 if (!s)
284 return 0;
285 ret = xstrdup(s);
286 return ret;
287}
288
289static int string_to_int(const char *s)
290{
291 long l;
292 char *p;
293
294 l = strtol(s, &p, 0);
295 if (*p || l == LONG_MIN || l == LONG_MAX || l < 0 || l > INT_MAX)
296 return -1;
297 else
298 return (int) l;
299}
300
301static char *skip_over_blank(char *cp)
302{
303 while (*cp && isspace(*cp))
304 cp++;
305 return cp;
306}
307
308static char *skip_over_word(char *cp)
309{
310 while (*cp && !isspace(*cp))
311 cp++;
312 return cp;
313}
314
315static void strip_line(char *line)
316{
317 char *p;
318
319 while (*line) {
320 p = line + strlen(line) - 1;
321 if ((*p == '\n') || (*p == '\r'))
322 *p = 0;
323 else
324 break;
325 }
326}
327
328static char *parse_word(char **buf)
329{
330 char *word, *next;
331
332 word = *buf;
333 if (*word == 0)
334 return 0;
335
336 word = skip_over_blank(word);
337 next = skip_over_word(word);
338 if (*next)
339 *next++ = 0;
340 *buf = next;
341 return word;
342}
343
344static void parse_escape(char *word)
345{
346 char *q, c;
347 const char *p;
348
349 if (!word)
350 return;
351
352 strcpy_and_process_escape_sequences(word, word);
353}
354
355static void free_instance(struct fsck_instance *i)
356{
357 if (i->prog)
358 free(i->prog);
359 if (i->device)
360 free(i->device);
361 if (i->base_device)
362 free(i->base_device);
363 free(i);
364}
365
366static struct fs_info *create_fs_device(const char *device, const char *mntpnt,
367 const char *type, const char *opts,
368 int freq, int passno)
369{
370 struct fs_info *fs;
371
372 fs = xmalloc(sizeof(struct fs_info));
373
374 fs->device = string_copy(device);
375 fs->mountpt = string_copy(mntpnt);
376 fs->type = string_copy(type);
377 fs->opts = string_copy(opts ? opts : "");
378 fs->freq = freq;
379 fs->passno = passno;
380 fs->flags = 0;
381 fs->next = NULL;
382
383 if (!filesys_info)
384 filesys_info = fs;
385 else
386 filesys_last->next = fs;
387 filesys_last = fs;
388
389 return fs;
390}
391
392
393
394static int parse_fstab_line(char *line, struct fs_info **ret_fs)
395{
396 char *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
397 struct fs_info *fs;
398
399 *ret_fs = 0;
400 strip_line(line);
401 if ((cp = strchr(line, '#')))
402 *cp = 0; /* Ignore everything after the comment char */
403 cp = line;
404
405 device = parse_word(&cp);
406 mntpnt = parse_word(&cp);
407 type = parse_word(&cp);
408 opts = parse_word(&cp);
409 freq = parse_word(&cp);
410 passno = parse_word(&cp);
411
412 if (!device)
413 return 0; /* Allow blank lines */
414
415 if (!mntpnt || !type)
416 return -1;
417
418 parse_escape(device);
419 parse_escape(mntpnt);
420 parse_escape(type);
421 parse_escape(opts);
422 parse_escape(freq);
423 parse_escape(passno);
424
425 dev = blkid_get_devname(cache, device, NULL);
426 if (dev)
427 device = dev;
428
429 if (strchr(type, ','))
430 type = 0;
431
432 fs = create_fs_device(device, mntpnt, type ? type : "auto", opts,
433 freq ? atoi(freq) : -1,
434 passno ? atoi(passno) : -1);
435 if (dev)
436 free(dev);
437
438 if (!fs)
439 return -1;
440 *ret_fs = fs;
441 return 0;
442}
443
444static void interpret_type(struct fs_info *fs)
445{
446 char *t;
447
448 if (strcmp(fs->type, "auto") != 0)
449 return;
450 t = blkid_get_tag_value(cache, "TYPE", fs->device);
451 if (t) {
452 free(fs->type);
453 fs->type = t;
454 }
455}
456
457/*
458 * Load the filesystem database from /etc/fstab
459 */
460static void load_fs_info(const char *filename)
461{
462 FILE *f;
463 char buf[1024];
464 int lineno = 0;
465 int old_fstab = 1;
466 struct fs_info *fs;
467
468 if ((f = fopen_or_warn(filename, "r")) == NULL) {
469 return;
470 }
471 while (!feof(f)) {
472 lineno++;
473 if (!fgets(buf, sizeof(buf), f))
474 break;
475 buf[sizeof(buf)-1] = 0;
476 if (parse_fstab_line(buf, &fs) < 0) {
477 bb_error_msg("WARNING: bad format "
478 "on line %d of %s\n", lineno, filename);
479 continue;
480 }
481 if (!fs)
482 continue;
483 if (fs->passno < 0)
484 fs->passno = 0;
485 else
486 old_fstab = 0;
487 }
488
489 fclose(f);
490
491 if (old_fstab) {
492 fputs("\007\007\007"
493 "WARNING: Your /etc/fstab does not contain the fsck passno\n"
494 " field. I will kludge around things for you, but you\n"
495 " should fix your /etc/fstab file as soon as you can.\n\n", stderr);
496
497 for (fs = filesys_info; fs; fs = fs->next) {
498 fs->passno = 1;
499 }
500 }
501}
502
503/* Lookup filesys in /etc/fstab and return the corresponding entry. */
504static struct fs_info *lookup(char *filesys)
505{
506 struct fs_info *fs;
507
508 /* No filesys name given. */
509 if (filesys == NULL)
510 return NULL;
511
512 for (fs = filesys_info; fs; fs = fs->next) {
513 if (!strcmp(filesys, fs->device) ||
514 (fs->mountpt && !strcmp(filesys, fs->mountpt)))
515 break;
516 }
517
518 return fs;
519}
520
521/* Find fsck program for a given fs type. */
522static char *find_fsck(char *type)
523{
524 char *s;
525 const char *tpl;
526 char *p = string_copy(fsck_path);
527 struct stat st;
528
529 /* Are we looking for a program or just a type? */
530 tpl = (strncmp(type, "fsck.", 5) ? "%s/fsck.%s" : "%s/%s");
531
532 for (s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
533 s = xasprintf(tpl, s, type);
534 if (stat(s, &st) == 0) break;
535 free(s);
536 }
537 free(p);
538 return s;
539}
540
541static int progress_active(void)
542{
543 struct fsck_instance *inst;
544
545 for (inst = instance_list; inst; inst = inst->next) {
546 if (inst->flags & FLAG_DONE)
547 continue;
548 if (inst->flags & FLAG_PROGRESS)
549 return 1;
550 }
551 return 0;
552}
553
554/*
555 * Execute a particular fsck program, and link it into the list of
556 * child processes we are waiting for.
557 */
558static int execute(const char *type, const char *device, const char *mntpt,
559 int interactive)
560{
561 char *s, *argv[80];
562 char *prog;
563 int argc, i;
564 struct fsck_instance *inst, *p;
565 pid_t pid;
566
567 inst = xzalloc(sizeof(struct fsck_instance));
568
569 prog = xasprintf("fsck.%s", type);
570 argv[0] = prog;
571 argc = 1;
572
573 for (i=0; i <num_args; i++)
574 argv[argc++] = string_copy(args[i]);
575
576 if (progress && !progress_active()) {
577 if ((strcmp(type, "ext2") == 0) ||
578 (strcmp(type, "ext3") == 0)) {
579 char tmp[80];
580 snprintf(tmp, 80, "-C%d", progress_fd);
581 argv[argc++] = string_copy(tmp);
582 inst->flags |= FLAG_PROGRESS;
583 }
584 }
585
586 argv[argc++] = string_copy(device);
587 argv[argc] = 0;
588
589 s = find_fsck(prog);
590 if (s == NULL) {
591 bb_error_msg("%s: not found", prog);
592 return ENOENT;
593 }
594
595 if (verbose || noexecute) {
596 printf("[%s (%d) -- %s] ", s, num_running,
597 mntpt ? mntpt : device);
598 for (i=0; i < argc; i++)
599 printf("%s ", argv[i]);
600 bb_putchar('\n');
601 }
602
603 /* Fork and execute the correct program. */
604 if (noexecute)
605 pid = -1;
606 else if ((pid = fork()) < 0) {
607 perror("vfork"+1);
608 return errno;
609 } else if (pid == 0) {
610 if (!interactive)
611 close(0);
612 (void) execv(s, argv);
613 bb_simple_perror_msg_and_die(argv[0]);
614 }
615
616 for (i = 1; i < argc; i++)
617 free(argv[i]);
618
619 free(s);
620 inst->pid = pid;
621 inst->prog = prog;
622 inst->type = string_copy(type);
623 inst->device = string_copy(device);
624 inst->base_device = base_device(device);
625 inst->start_time = time(0);
626 inst->next = NULL;
627
628 /*
629 * Find the end of the list, so we add the instance on at the end.
630 */
631 for (p = instance_list; p && p->next; p = p->next);
632
633 if (p)
634 p->next = inst;
635 else
636 instance_list = inst;
637
638 return 0;
639}
640
641/*
642 * Send a signal to all outstanding fsck child processes
643 */
644static int kill_all(int signum)
645{
646 struct fsck_instance *inst;
647 int n = 0;
648
649 for (inst = instance_list; inst; inst = inst->next) {
650 if (inst->flags & FLAG_DONE)
651 continue;
652 kill(inst->pid, signum);
653 n++;
654 }
655 return n;
656}
657
658/*
659 * Wait for one child process to exit; when it does, unlink it from
660 * the list of executing child processes, and return it.
661 */
662static struct fsck_instance *wait_one(int flags)
663{
664 int status;
665 int sig;
666 struct fsck_instance *inst, *inst2, *prev;
667 pid_t pid;
668
669 if (!instance_list)
670 return NULL;
671
672 if (noexecute) {
673 inst = instance_list;
674 prev = 0;
675#ifdef RANDOM_DEBUG
676 while (inst->next && (random() & 1)) {
677 prev = inst;
678 inst = inst->next;
679 }
680#endif
681 inst->exit_status = 0;
682 goto ret_inst;
683 }
684
685 /*
686 * gcc -Wall fails saving throw against stupidity
687 * (inst and prev are thought to be uninitialized variables)
688 */
689 inst = prev = NULL;
690
691 do {
692 pid = waitpid(-1, &status, flags);
693 if (cancel_requested && !kill_sent) {
694 kill_all(SIGTERM);
695 kill_sent++;
696 }
697 if ((pid == 0) && (flags & WNOHANG))
698 return NULL;
699 if (pid < 0) {
700 if ((errno == EINTR) || (errno == EAGAIN))
701 continue;
702 if (errno == ECHILD) {
703 bb_error_msg("wait: no more child process?!?");
704 return NULL;
705 }
706 perror("wait");
707 continue;
708 }
709 for (prev = 0, inst = instance_list;
710 inst;
711 prev = inst, inst = inst->next) {
712 if (inst->pid == pid)
713 break;
714 }
715 } while (!inst);
716
717 if (WIFEXITED(status))
718 status = WEXITSTATUS(status);
719 else if (WIFSIGNALED(status)) {
720 sig = WTERMSIG(status);
721 if (sig == SIGINT) {
722 status = EXIT_UNCORRECTED;
723 } else {
724 printf("Warning... %s for device %s exited "
725 "with signal %d.\n",
726 inst->prog, inst->device, sig);
727 status = EXIT_ERROR;
728 }
729 } else {
730 printf("%s %s: status is %x, should never happen.\n",
731 inst->prog, inst->device, status);
732 status = EXIT_ERROR;
733 }
734 inst->exit_status = status;
735 if (progress && (inst->flags & FLAG_PROGRESS) &&
736 !progress_active()) {
737 for (inst2 = instance_list; inst2; inst2 = inst2->next) {
738 if (inst2->flags & FLAG_DONE)
739 continue;
740 if (strcmp(inst2->type, "ext2") &&
741 strcmp(inst2->type, "ext3"))
742 continue;
743 /*
744 * If we've just started the fsck, wait a tiny
745 * bit before sending the kill, to give it
746 * time to set up the signal handler
747 */
748 if (inst2->start_time < time(0)+2) {
749 if (fork() == 0) {
750 sleep(1);
751 kill(inst2->pid, SIGUSR1);
752 exit(0);
753 }
754 } else
755 kill(inst2->pid, SIGUSR1);
756 inst2->flags |= FLAG_PROGRESS;
757 break;
758 }
759 }
760ret_inst:
761 if (prev)
762 prev->next = inst->next;
763 else
764 instance_list = inst->next;
765 if (verbose > 1)
766 printf("Finished with %s (exit status %d)\n",
767 inst->device, inst->exit_status);
768 num_running--;
769 return inst;
770}
771
772#define FLAG_WAIT_ALL 0
773#define FLAG_WAIT_ATLEAST_ONE 1
774/*
775 * Wait until all executing child processes have exited; return the
776 * logical OR of all of their exit code values.
777 */
778static int wait_many(int flags)
779{
780 struct fsck_instance *inst;
781 int global_status = 0;
782 int wait_flags = 0;
783
784 while ((inst = wait_one(wait_flags))) {
785 global_status |= inst->exit_status;
786 free_instance(inst);
787#ifdef RANDOM_DEBUG
788 if (noexecute && (flags & WNOHANG) && !(random() % 3))
789 break;
790#endif
791 if (flags & FLAG_WAIT_ATLEAST_ONE)
792 wait_flags = WNOHANG;
793 }
794 return global_status;
795}
796
797/*
798 * Run the fsck program on a particular device
799 *
800 * If the type is specified using -t, and it isn't prefixed with "no"
801 * (as in "noext2") and only one filesystem type is specified, then
802 * use that type regardless of what is specified in /etc/fstab.
803 *
804 * If the type isn't specified by the user, then use either the type
805 * specified in /etc/fstab, or DEFAULT_FSTYPE.
806 */
807static void fsck_device(struct fs_info *fs, int interactive)
808{
809 const char *type;
810 int retval;
811
812 interpret_type(fs);
813
814 if (strcmp(fs->type, "auto") != 0)
815 type = fs->type;
816 else if (fstype && strncmp(fstype, "no", 2) &&
817 strncmp(fstype, "opts=", 5) && strncmp(fstype, "loop", 4) &&
818 !strchr(fstype, ','))
819 type = fstype;
820 else
821 type = DEFAULT_FSTYPE;
822
823 num_running++;
824 retval = execute(type, fs->device, fs->mountpt, interactive);
825 if (retval) {
826 bb_error_msg("error %d while executing fsck.%s for %s",
827 retval, type, fs->device);
828 num_running--;
829 }
830}
831
832
833/*
834 * Deal with the fsck -t argument.
835 */
836struct fs_type_compile {
837 char **list;
838 int *type;
839 int negate;
840} fs_type_compiled;
841
842#define FS_TYPE_NORMAL 0
843#define FS_TYPE_OPT 1
844#define FS_TYPE_NEGOPT 2
845
846static const char fs_type_syntax_error[] =
847"Either all or none of the filesystem types passed to -t must be prefixed\n"
848 "with 'no' or '!'.";
849
850static void compile_fs_type(char *fs_type, struct fs_type_compile *cmp)
851{
852 char *cp, *list, *s;
853 int num = 2;
854 int negate, first_negate = 1;
855
856 if (fs_type) {
857 for (cp=fs_type; *cp; cp++) {
858 if (*cp == ',')
859 num++;
860 }
861 }
862
863 cmp->list = xzalloc(num * sizeof(char *));
864 cmp->type = xzalloc(num * sizeof(int));
865 cmp->negate = 0;
866
867 if (!fs_type)
868 return;
869
870 list = string_copy(fs_type);
871 num = 0;
872 s = strtok(list, ",");
873 while (s) {
874 negate = 0;
875 if (strncmp(s, "no", 2) == 0) {
876 s += 2;
877 negate = 1;
878 } else if (*s == '!') {
879 s++;
880 negate = 1;
881 }
882 if (strcmp(s, "loop") == 0)
883 /* loop is really short-hand for opts=loop */
884 goto loop_special_case;
885 else if (strncmp(s, "opts=", 5) == 0) {
886 s += 5;
887 loop_special_case:
888 cmp->type[num] = negate ? FS_TYPE_NEGOPT : FS_TYPE_OPT;
889 } else {
890 if (first_negate) {
891 cmp->negate = negate;
892 first_negate = 0;
893 }
894 if ((negate && !cmp->negate) ||
895 (!negate && cmp->negate)) {
896 bb_error_msg_and_die("%s", fs_type_syntax_error);
897 }
898 }
899 cmp->list[num++] = string_copy(s);
900 s = strtok(NULL, ",");
901 }
902 free(list);
903}
904
905/*
906 * This function returns true if a particular option appears in a
907 * comma-delimited options list
908 */
909static int opt_in_list(char *opt, char *optlist)
910{
911 char *list, *s;
912
913 if (!optlist)
914 return 0;
915 list = string_copy(optlist);
916
917 s = strtok(list, ",");
918 while (s) {
919 if (strcmp(s, opt) == 0) {
920 free(list);
921 return 1;
922 }
923 s = strtok(NULL, ",");
924 }
925 free(list);
926 return 0;
927}
928
929/* See if the filesystem matches the criteria given by the -t option */
930static int fs_match(struct fs_info *fs, struct fs_type_compile *cmp)
931{
932 int n, ret = 0, checked_type = 0;
933 char *cp;
934
935 if (cmp->list == 0 || cmp->list[0] == 0)
936 return 1;
937
938 for (n=0; (cp = cmp->list[n]); n++) {
939 switch (cmp->type[n]) {
940 case FS_TYPE_NORMAL:
941 checked_type++;
942 if (strcmp(cp, fs->type) == 0) {
943 ret = 1;
944 }
945 break;
946 case FS_TYPE_NEGOPT:
947 if (opt_in_list(cp, fs->opts))
948 return 0;
949 break;
950 case FS_TYPE_OPT:
951 if (!opt_in_list(cp, fs->opts))
952 return 0;
953 break;
954 }
955 }
956 if (checked_type == 0)
957 return 1;
958 return (cmp->negate ? !ret : ret);
959}
960
961/* Check if we should ignore this filesystem. */
962static int ignore(struct fs_info *fs)
963{
964 int wanted;
965 char *s;
966
967 /*
968 * If the pass number is 0, ignore it.
969 */
970 if (fs->passno == 0)
971 return 1;
972
973 interpret_type(fs);
974
975 /*
976 * If a specific fstype is specified, and it doesn't match,
977 * ignore it.
978 */
979 if (!fs_match(fs, &fs_type_compiled)) return 1;
980
981 /* Are we ignoring this type? */
982 if (index_in_str_array(ignored_types, fs->type) >= 0)
983 return 1;
984
985 /* Do we really really want to check this fs? */
986 wanted = index_in_str_array(really_wanted, fs->type) >= 0;
987
988 /* See if the <fsck.fs> program is available. */
989 s = find_fsck(fs->type);
990 if (s == NULL) {
991 if (wanted)
992 bb_error_msg("can't check %s: fsck.%s not found",
993 fs->device, fs->type);
994 return 1;
995 }
996 free(s);
997
998 /* We can and want to check this file system type. */
999 return 0;
1000}
1001
1002/*
1003 * Returns TRUE if a partition on the same disk is already being
1004 * checked.
1005 */
1006static int device_already_active(char *device)
1007{
1008 struct fsck_instance *inst;
1009 char *base;
1010
1011 if (force_all_parallel)
1012 return 0;
1013
1014#ifdef BASE_MD
1015 /* Don't check a soft raid disk with any other disk */
1016 if (instance_list &&
1017 (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
1018 !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
1019 return 1;
1020#endif
1021
1022 base = base_device(device);
1023 /*
1024 * If we don't know the base device, assume that the device is
1025 * already active if there are any fsck instances running.
1026 */
1027 if (!base)
1028 return (instance_list != 0);
1029 for (inst = instance_list; inst; inst = inst->next) {
1030 if (!inst->base_device || !strcmp(base, inst->base_device)) {
1031 free(base);
1032 return 1;
1033 }
1034 }
1035 free(base);
1036 return 0;
1037}
1038
1039/* Check all file systems, using the /etc/fstab table. */
1040static int check_all(void)
1041{
1042 struct fs_info *fs = NULL;
1043 int status = EXIT_OK;
1044 int not_done_yet = 1;
1045 int passno = 1;
1046 int pass_done;
1047
1048 if (verbose)
1049 fputs("Checking all file systems.\n", stdout);
1050
1051 /*
1052 * Do an initial scan over the filesystem; mark filesystems
1053 * which should be ignored as done, and resolve any "auto"
1054 * filesystem types (done as a side-effect of calling ignore()).
1055 */
1056 for (fs = filesys_info; fs; fs = fs->next) {
1057 if (ignore(fs))
1058 fs->flags |= FLAG_DONE;
1059 }
1060
1061 /*
1062 * Find and check the root filesystem.
1063 */
1064 if (!parallel_root) {
1065 for (fs = filesys_info; fs; fs = fs->next) {
1066 if (LONE_CHAR(fs->mountpt, '/'))
1067 break;
1068 }
1069 if (fs) {
1070 if (!skip_root && !ignore(fs)) {
1071 fsck_device(fs, 1);
1072 status |= wait_many(FLAG_WAIT_ALL);
1073 if (status > EXIT_NONDESTRUCT)
1074 return status;
1075 }
1076 fs->flags |= FLAG_DONE;
1077 }
1078 }
1079 /*
1080 * This is for the bone-headed user who enters the root
1081 * filesystem twice. Skip root will skep all root entries.
1082 */
1083 if (skip_root)
1084 for (fs = filesys_info; fs; fs = fs->next)
1085 if (LONE_CHAR(fs->mountpt, '/'))
1086 fs->flags |= FLAG_DONE;
1087
1088 while (not_done_yet) {
1089 not_done_yet = 0;
1090 pass_done = 1;
1091
1092 for (fs = filesys_info; fs; fs = fs->next) {
1093 if (cancel_requested)
1094 break;
1095 if (fs->flags & FLAG_DONE)
1096 continue;
1097 /*
1098 * If the filesystem's pass number is higher
1099 * than the current pass number, then we don't
1100 * do it yet.
1101 */
1102 if (fs->passno > passno) {
1103 not_done_yet++;
1104 continue;
1105 }
1106 /*
1107 * If a filesystem on a particular device has
1108 * already been spawned, then we need to defer
1109 * this to another pass.
1110 */
1111 if (device_already_active(fs->device)) {
1112 pass_done = 0;
1113 continue;
1114 }
1115 /*
1116 * Spawn off the fsck process
1117 */
1118 fsck_device(fs, serialize);
1119 fs->flags |= FLAG_DONE;
1120
1121 /*
1122 * Only do one filesystem at a time, or if we
1123 * have a limit on the number of fsck's extant
1124 * at one time, apply that limit.
1125 */
1126 if (serialize ||
1127 (max_running && (num_running >= max_running))) {
1128 pass_done = 0;
1129 break;
1130 }
1131 }
1132 if (cancel_requested)
1133 break;
1134 if (verbose > 1)
1135 printf("--waiting-- (pass %d)\n", passno);
1136 status |= wait_many(pass_done ? FLAG_WAIT_ALL :
1137 FLAG_WAIT_ATLEAST_ONE);
1138 if (pass_done) {
1139 if (verbose > 1)
1140 printf("----------------------------------\n");
1141 passno++;
1142 } else
1143 not_done_yet++;
1144 }
1145 if (cancel_requested && !kill_sent) {
1146 kill_all(SIGTERM);
1147 kill_sent++;
1148 }
1149 status |= wait_many(FLAG_WAIT_ATLEAST_ONE);
1150 return status;
1151}
1152
1153static void signal_cancel(int sig FSCK_ATTR((unused)))
1154{
1155 cancel_requested++;
1156}
1157
1158static void PRS(int argc, char **argv)
1159{
1160 int i, j;
1161 char *arg, *dev, *tmp = NULL;
1162 char options[128];
1163 int opt = 0;
1164 int opts_for_fsck = 0;
1165 struct sigaction sa;
1166
1167 /*
1168 * Set up signal action
1169 */
1170 memset(&sa, 0, sizeof(struct sigaction));
1171 sa.sa_handler = signal_cancel;
1172 sigaction(SIGINT, &sa, 0);
1173 sigaction(SIGTERM, &sa, 0);
1174
1175 num_devices = 0;
1176 num_args = 0;
1177 instance_list = 0;
1178
1179 for (i=1; i < argc; i++) {
1180 arg = argv[i];
1181 if (!arg)
1182 continue;
1183 if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) {
1184 if (num_devices >= MAX_DEVICES) {
1185 bb_error_msg_and_die("too many devices");
1186 }
1187 dev = blkid_get_devname(cache, arg, NULL);
1188 if (!dev && strchr(arg, '=')) {
1189 /*
1190 * Check to see if we failed because
1191 * /proc/partitions isn't found.
1192 */
1193 if (access("/proc/partitions", R_OK) < 0) {
1194 bb_perror_msg_and_die("can't open /proc/partitions "
1195 "(is /proc mounted?)");
1196 }
1197 /*
1198 * Check to see if this is because
1199 * we're not running as root
1200 */
1201 if (geteuid())
1202 bb_error_msg_and_die(
1203 "must be root to scan for matching filesystems: %s\n", arg);
1204 else
1205 bb_error_msg_and_die(
1206 "can't find matching filesystem: %s", arg);
1207 }
1208 devices[num_devices++] = dev ? dev : string_copy(arg);
1209 continue;
1210 }
1211 if (arg[0] != '-' || opts_for_fsck) {
1212 if (num_args >= MAX_ARGS) {
1213 bb_error_msg_and_die("too many arguments");
1214 }
1215 args[num_args++] = string_copy(arg);
1216 continue;
1217 }
1218 for (j=1; arg[j]; j++) {
1219 if (opts_for_fsck) {
1220 options[++opt] = arg[j];
1221 continue;
1222 }
1223 switch (arg[j]) {
1224 case 'A':
1225 doall++;
1226 break;
1227 case 'C':
1228 progress++;
1229 if (arg[j+1]) {
1230 progress_fd = string_to_int(arg+j+1);
1231 if (progress_fd < 0)
1232 progress_fd = 0;
1233 else
1234 goto next_arg;
1235 } else if ((i+1) < argc
1236 && argv[i+1][0] != '-') {
1237 progress_fd = string_to_int(argv[i]);
1238 if (progress_fd < 0)
1239 progress_fd = 0;
1240 else {
1241 goto next_arg;
1242 i++;
1243 }
1244 }
1245 break;
1246 case 'V':
1247 verbose++;
1248 break;
1249 case 'N':
1250 noexecute++;
1251 break;
1252 case 'R':
1253 skip_root++;
1254 break;
1255 case 'T':
1256 notitle++;
1257 break;
1258 case 'M':
1259 like_mount++;
1260 break;
1261 case 'P':
1262 parallel_root++;
1263 break;
1264 case 's':
1265 serialize++;
1266 break;
1267 case 't':
1268 tmp = 0;
1269 if (fstype)
1270 bb_show_usage();
1271 if (arg[j+1])
1272 tmp = arg+j+1;
1273 else if ((i+1) < argc)
1274 tmp = argv[++i];
1275 else
1276 bb_show_usage();
1277 fstype = string_copy(tmp);
1278 compile_fs_type(fstype, &fs_type_compiled);
1279 goto next_arg;
1280 case '-':
1281 opts_for_fsck++;
1282 break;
1283 case '?':
1284 bb_show_usage();
1285 break;
1286 default:
1287 options[++opt] = arg[j];
1288 break;
1289 }
1290 }
1291 next_arg:
1292 if (opt) {
1293 options[0] = '-';
1294 options[++opt] = '\0';
1295 if (num_args >= MAX_ARGS) {
1296 bb_error_msg("too many arguments");
1297 }
1298 args[num_args++] = string_copy(options);
1299 opt = 0;
1300 }
1301 }
1302 if (getenv("FSCK_FORCE_ALL_PARALLEL"))
1303 force_all_parallel++;
1304 if ((tmp = getenv("FSCK_MAX_INST")))
1305 max_running = atoi(tmp);
1306}
1307
1308int fsck_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1309int fsck_main(int argc, char **argv)
1310{
1311 int i, status = 0;
1312 int interactive = 0;
1313 const char *fstab;
1314 struct fs_info *fs;
1315
1316 setvbuf(stdout, NULL, _IONBF, BUFSIZ);
1317 setvbuf(stderr, NULL, _IONBF, BUFSIZ);
1318
1319 blkid_get_cache(&cache, NULL);
1320 PRS(argc, argv);
1321
1322 if (!notitle)
1323 printf("fsck %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
1324
1325 fstab = getenv("FSTAB_FILE");
1326 if (!fstab)
1327 fstab = _PATH_MNTTAB;
1328 load_fs_info(fstab);
1329
1330 fsck_path = e2fs_set_sbin_path();
1331
1332 if ((num_devices == 1) || (serialize))
1333 interactive = 1;
1334
1335 /* If -A was specified ("check all"), do that! */
1336 if (doall)
1337 return check_all();
1338
1339 if (num_devices == 0) {
1340 serialize++;
1341 interactive++;
1342 return check_all();
1343 }
1344 for (i = 0; i < num_devices; i++) {
1345 if (cancel_requested) {
1346 if (!kill_sent) {
1347 kill_all(SIGTERM);
1348 kill_sent++;
1349 }
1350 break;
1351 }
1352 fs = lookup(devices[i]);
1353 if (!fs) {
1354 fs = create_fs_device(devices[i], 0, "auto",
1355 0, -1, -1);
1356 if (!fs)
1357 continue;
1358 }
1359 fsck_device(fs, interactive);
1360 if (serialize ||
1361 (max_running && (num_running >= max_running))) {
1362 struct fsck_instance *inst;
1363
1364 inst = wait_one(0);
1365 if (inst) {
1366 status |= inst->exit_status;
1367 free_instance(inst);
1368 }
1369 if (verbose > 1)
1370 printf("----------------------------------\n");
1371 }
1372 }
1373 status |= wait_many(FLAG_WAIT_ALL);
1374 blkid_put_cache(cache);
1375 return status;
1376}
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