Contents of /trunk/mkinitrd-magellan/busybox/e2fsprogs/fsck.c
Parent Directory | Revision Log
Revision 532 -
(show annotations)
(download)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 26807 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 26807 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 | * %Begin-Header% |
24 | * This file may be redistributed under the terms of the GNU Public |
25 | * License. |
26 | * %End-Header% |
27 | */ |
28 | |
29 | /* All filesystem specific hooks have been removed. |
30 | * If filesystem cannot be determined, we will execute |
31 | * "fsck.auto". Currently this also happens if you specify |
32 | * UUID=xxx or LABEL=xxx as an object to check. |
33 | * Detection code for that is also probably has to be in fsck.auto. |
34 | * |
35 | * In other words, this is _really_ is just a driver program which |
36 | * spawns actual fsck.something for each filesystem to check. |
37 | * It doesn't guess filesystem types from on-disk format. |
38 | */ |
39 | |
40 | #include "busybox.h" |
41 | |
42 | #define EXIT_OK 0 |
43 | #define EXIT_NONDESTRUCT 1 |
44 | #define EXIT_DESTRUCT 2 |
45 | #define EXIT_UNCORRECTED 4 |
46 | #define EXIT_ERROR 8 |
47 | #define EXIT_USAGE 16 |
48 | #define FSCK_CANCELED 32 /* Aborted with a signal or ^C */ |
49 | |
50 | /* |
51 | * Internal structure for mount table entries. |
52 | */ |
53 | |
54 | struct fs_info { |
55 | struct fs_info *next; |
56 | char *device; |
57 | char *mountpt; |
58 | char *type; |
59 | char *opts; |
60 | int freq; |
61 | int passno; |
62 | int flags; |
63 | }; |
64 | |
65 | #define FLAG_DONE 1 |
66 | #define FLAG_PROGRESS 2 |
67 | /* |
68 | * Structure to allow exit codes to be stored |
69 | */ |
70 | struct fsck_instance { |
71 | struct fsck_instance *next; |
72 | int pid; |
73 | int flags; |
74 | int exit_status; |
75 | time_t start_time; |
76 | char *prog; |
77 | char *type; |
78 | char *device; |
79 | char *base_device; /* /dev/hda for /dev/hdaN etc */ |
80 | }; |
81 | |
82 | static const char *const ignored_types[] = { |
83 | "ignore", |
84 | "iso9660", |
85 | "nfs", |
86 | "proc", |
87 | "sw", |
88 | "swap", |
89 | "tmpfs", |
90 | "devpts", |
91 | NULL |
92 | }; |
93 | |
94 | #if 0 |
95 | static const char *const really_wanted[] = { |
96 | "minix", |
97 | "ext2", |
98 | "ext3", |
99 | "jfs", |
100 | "reiserfs", |
101 | "xiafs", |
102 | "xfs", |
103 | NULL |
104 | }; |
105 | #endif |
106 | |
107 | #define BASE_MD "/dev/md" |
108 | |
109 | static char **devices; |
110 | static char **args; |
111 | static int num_devices; |
112 | static int num_args; |
113 | static int verbose; |
114 | |
115 | #define FS_TYPE_FLAG_NORMAL 0 |
116 | #define FS_TYPE_FLAG_OPT 1 |
117 | #define FS_TYPE_FLAG_NEGOPT 2 |
118 | static char **fs_type_list; |
119 | static uint8_t *fs_type_flag; |
120 | static smallint fs_type_negated; |
121 | |
122 | static volatile smallint cancel_requested; |
123 | static smallint doall; |
124 | static smallint noexecute; |
125 | static smallint serialize; |
126 | static smallint skip_root; |
127 | /* static smallint like_mount; */ |
128 | static smallint notitle; |
129 | static smallint parallel_root; |
130 | static smallint force_all_parallel; |
131 | |
132 | /* "progress indicator" code is somewhat buggy and ext[23] specific. |
133 | * We should be filesystem agnostic. IOW: there should be a well-defined |
134 | * API for fsck.something, NOT ad-hoc hacks in generic fsck. */ |
135 | #define DO_PROGRESS_INDICATOR 0 |
136 | #if DO_PROGRESS_INDICATOR |
137 | static smallint progress; |
138 | static int progress_fd; |
139 | #endif |
140 | |
141 | static int num_running; |
142 | static int max_running; |
143 | static char *fstype; |
144 | static struct fs_info *filesys_info; |
145 | static struct fs_info *filesys_last; |
146 | static struct fsck_instance *instance_list; |
147 | |
148 | /* |
149 | * Return the "base device" given a particular device; this is used to |
150 | * assure that we only fsck one partition on a particular drive at any |
151 | * one time. Otherwise, the disk heads will be seeking all over the |
152 | * place. If the base device cannot be determined, return NULL. |
153 | * |
154 | * The base_device() function returns an allocated string which must |
155 | * be freed. |
156 | */ |
157 | #if ENABLE_FEATURE_DEVFS |
158 | /* |
159 | * Required for the uber-silly devfs /dev/ide/host1/bus2/target3/lun3 |
160 | * pathames. |
161 | */ |
162 | static const char *const devfs_hier[] = { |
163 | "host", "bus", "target", "lun", NULL |
164 | }; |
165 | #endif |
166 | |
167 | static char *base_device(const char *device) |
168 | { |
169 | char *str, *cp; |
170 | #if ENABLE_FEATURE_DEVFS |
171 | const char *const *hier; |
172 | const char *disk; |
173 | int len; |
174 | #endif |
175 | cp = str = xstrdup(device); |
176 | |
177 | /* Skip over /dev/; if it's not present, give up. */ |
178 | if (strncmp(cp, "/dev/", 5) != 0) |
179 | goto errout; |
180 | cp += 5; |
181 | |
182 | /* |
183 | * For md devices, we treat them all as if they were all |
184 | * on one disk, since we don't know how to parallelize them. |
185 | */ |
186 | if (cp[0] == 'm' && cp[1] == 'd') { |
187 | cp[2] = 0; |
188 | return str; |
189 | } |
190 | |
191 | /* Handle DAC 960 devices */ |
192 | if (strncmp(cp, "rd/", 3) == 0) { |
193 | cp += 3; |
194 | if (cp[0] != 'c' || !isdigit(cp[1]) |
195 | || cp[2] != 'd' || !isdigit(cp[3])) |
196 | goto errout; |
197 | cp[4] = 0; |
198 | return str; |
199 | } |
200 | |
201 | /* Now let's handle /dev/hd* and /dev/sd* devices.... */ |
202 | if ((cp[0] == 'h' || cp[0] == 's') && cp[1] == 'd') { |
203 | cp += 2; |
204 | /* If there's a single number after /dev/hd, skip it */ |
205 | if (isdigit(*cp)) |
206 | cp++; |
207 | /* What follows must be an alpha char, or give up */ |
208 | if (!isalpha(*cp)) |
209 | goto errout; |
210 | cp[1] = 0; |
211 | return str; |
212 | } |
213 | |
214 | #if ENABLE_FEATURE_DEVFS |
215 | /* Now let's handle devfs (ugh) names */ |
216 | len = 0; |
217 | if (strncmp(cp, "ide/", 4) == 0) |
218 | len = 4; |
219 | if (strncmp(cp, "scsi/", 5) == 0) |
220 | len = 5; |
221 | if (len) { |
222 | cp += len; |
223 | /* |
224 | * Now we proceed down the expected devfs hierarchy. |
225 | * i.e., .../host1/bus2/target3/lun4/... |
226 | * If we don't find the expected token, followed by |
227 | * some number of digits at each level, abort. |
228 | */ |
229 | for (hier = devfs_hier; *hier; hier++) { |
230 | len = strlen(*hier); |
231 | if (strncmp(cp, *hier, len) != 0) |
232 | goto errout; |
233 | cp += len; |
234 | while (*cp != '/' && *cp != 0) { |
235 | if (!isdigit(*cp)) |
236 | goto errout; |
237 | cp++; |
238 | } |
239 | cp++; |
240 | } |
241 | cp[-1] = 0; |
242 | return str; |
243 | } |
244 | |
245 | /* Now handle devfs /dev/disc or /dev/disk names */ |
246 | disk = 0; |
247 | if (strncmp(cp, "discs/", 6) == 0) |
248 | disk = "disc"; |
249 | else if (strncmp(cp, "disks/", 6) == 0) |
250 | disk = "disk"; |
251 | if (disk) { |
252 | cp += 6; |
253 | if (strncmp(cp, disk, 4) != 0) |
254 | goto errout; |
255 | cp += 4; |
256 | while (*cp != '/' && *cp != 0) { |
257 | if (!isdigit(*cp)) |
258 | goto errout; |
259 | cp++; |
260 | } |
261 | *cp = 0; |
262 | return str; |
263 | } |
264 | #endif |
265 | errout: |
266 | free(str); |
267 | return NULL; |
268 | } |
269 | |
270 | static void free_instance(struct fsck_instance *p) |
271 | { |
272 | free(p->prog); |
273 | free(p->device); |
274 | free(p->base_device); |
275 | free(p); |
276 | } |
277 | |
278 | static struct fs_info *create_fs_device(const char *device, const char *mntpnt, |
279 | const char *type, const char *opts, |
280 | int freq, int passno) |
281 | { |
282 | struct fs_info *fs; |
283 | |
284 | fs = xzalloc(sizeof(*fs)); |
285 | fs->device = xstrdup(device); |
286 | fs->mountpt = xstrdup(mntpnt); |
287 | fs->type = xstrdup(type); |
288 | fs->opts = xstrdup(opts ? opts : ""); |
289 | fs->freq = freq; |
290 | fs->passno = passno; |
291 | /*fs->flags = 0; */ |
292 | /*fs->next = NULL; */ |
293 | |
294 | if (!filesys_info) |
295 | filesys_info = fs; |
296 | else |
297 | filesys_last->next = fs; |
298 | filesys_last = fs; |
299 | |
300 | return fs; |
301 | } |
302 | |
303 | static void strip_line(char *line) |
304 | { |
305 | char *p = line + strlen(line) - 1; |
306 | |
307 | while (*line) { |
308 | if (*p != '\n' && *p != '\r') |
309 | break; |
310 | *p-- = '\0'; |
311 | } |
312 | } |
313 | |
314 | static char *parse_word(char **buf) |
315 | { |
316 | char *word, *next; |
317 | |
318 | word = *buf; |
319 | if (*word == '\0') |
320 | return NULL; |
321 | |
322 | word = skip_whitespace(word); |
323 | next = skip_non_whitespace(word); |
324 | if (*next) |
325 | *next++ = '\0'; |
326 | *buf = next; |
327 | return word; |
328 | } |
329 | |
330 | static void parse_escape(char *word) |
331 | { |
332 | char *q, c; |
333 | const char *p; |
334 | |
335 | if (!word) |
336 | return; |
337 | |
338 | for (p = q = word; *p; q++) { |
339 | c = *p++; |
340 | if (c != '\\') { |
341 | *q = c; |
342 | } else { |
343 | *q = bb_process_escape_sequence(&p); |
344 | } |
345 | } |
346 | *q = '\0'; |
347 | } |
348 | |
349 | static int parse_fstab_line(char *line, struct fs_info **ret_fs) |
350 | { |
351 | char *device, *mntpnt, *type, *opts, *freq, *passno, *cp; |
352 | struct fs_info *fs; |
353 | |
354 | *ret_fs = 0; |
355 | strip_line(line); |
356 | cp = strchr(line, '#'); |
357 | if (cp) |
358 | *cp = '\0'; /* Ignore everything after the comment char */ |
359 | cp = line; |
360 | |
361 | device = parse_word(&cp); |
362 | if (!device) return 0; /* Allow blank lines */ |
363 | mntpnt = parse_word(&cp); |
364 | type = parse_word(&cp); |
365 | opts = parse_word(&cp); |
366 | freq = parse_word(&cp); |
367 | passno = parse_word(&cp); |
368 | |
369 | if (!mntpnt || !type) |
370 | return -1; |
371 | |
372 | parse_escape(device); |
373 | parse_escape(mntpnt); |
374 | parse_escape(type); |
375 | parse_escape(opts); |
376 | parse_escape(freq); |
377 | parse_escape(passno); |
378 | |
379 | if (strchr(type, ',')) |
380 | type = NULL; |
381 | |
382 | fs = create_fs_device(device, mntpnt, type ? type : "auto", opts, |
383 | freq ? atoi(freq) : -1, |
384 | passno ? atoi(passno) : -1); |
385 | *ret_fs = fs; |
386 | return 0; |
387 | } |
388 | |
389 | /* Load the filesystem database from /etc/fstab */ |
390 | static void load_fs_info(const char *filename) |
391 | { |
392 | FILE *f; |
393 | int lineno = 0; |
394 | int old_fstab = 1; |
395 | struct fs_info *fs; |
396 | |
397 | f = fopen_or_warn(filename, "r"); |
398 | if (f == NULL) { |
399 | /*bb_perror_msg("WARNING: cannot open %s", filename);*/ |
400 | return; |
401 | } |
402 | while (1) { |
403 | int r; |
404 | char *buf = xmalloc_getline(f); |
405 | if (!buf) break; |
406 | r = parse_fstab_line(buf, &fs); |
407 | free(buf); |
408 | lineno++; |
409 | if (r < 0) { |
410 | bb_error_msg("WARNING: bad format " |
411 | "on line %d of %s", lineno, filename); |
412 | continue; |
413 | } |
414 | if (!fs) |
415 | continue; |
416 | if (fs->passno < 0) |
417 | fs->passno = 0; |
418 | else |
419 | old_fstab = 0; |
420 | } |
421 | fclose(f); |
422 | |
423 | if (old_fstab) { |
424 | fputs("\007" |
425 | "WARNING: Your /etc/fstab does not contain the fsck passno field.\n" |
426 | "I will kludge around things for you, but you should fix\n" |
427 | "your /etc/fstab file as soon as you can.\n\n", stderr); |
428 | for (fs = filesys_info; fs; fs = fs->next) { |
429 | fs->passno = 1; |
430 | } |
431 | } |
432 | } |
433 | |
434 | /* Lookup filesys in /etc/fstab and return the corresponding entry. */ |
435 | static struct fs_info *lookup(char *filesys) |
436 | { |
437 | struct fs_info *fs; |
438 | |
439 | for (fs = filesys_info; fs; fs = fs->next) { |
440 | if (strcmp(filesys, fs->device) == 0 |
441 | || (fs->mountpt && strcmp(filesys, fs->mountpt) == 0) |
442 | ) |
443 | break; |
444 | } |
445 | |
446 | return fs; |
447 | } |
448 | |
449 | #if DO_PROGRESS_INDICATOR |
450 | static int progress_active(void) |
451 | { |
452 | struct fsck_instance *inst; |
453 | |
454 | for (inst = instance_list; inst; inst = inst->next) { |
455 | if (inst->flags & FLAG_DONE) |
456 | continue; |
457 | if (inst->flags & FLAG_PROGRESS) |
458 | return 1; |
459 | } |
460 | return 0; |
461 | } |
462 | #endif |
463 | |
464 | |
465 | /* |
466 | * Send a signal to all outstanding fsck child processes |
467 | */ |
468 | static void kill_all_if_cancel_requested(void) |
469 | { |
470 | static smallint kill_sent; |
471 | |
472 | struct fsck_instance *inst; |
473 | |
474 | if (!cancel_requested || kill_sent) |
475 | return; |
476 | |
477 | for (inst = instance_list; inst; inst = inst->next) { |
478 | if (inst->flags & FLAG_DONE) |
479 | continue; |
480 | kill(inst->pid, SIGTERM); |
481 | } |
482 | kill_sent = 1; |
483 | } |
484 | |
485 | /* |
486 | * Wait for one child process to exit; when it does, unlink it from |
487 | * the list of executing child processes, and return it. |
488 | */ |
489 | static struct fsck_instance *wait_one(int flags) |
490 | { |
491 | int status; |
492 | int sig; |
493 | struct fsck_instance *inst, *prev; |
494 | pid_t pid; |
495 | |
496 | if (!instance_list) |
497 | return NULL; |
498 | |
499 | if (noexecute) { |
500 | inst = instance_list; |
501 | prev = NULL; |
502 | #ifdef RANDOM_DEBUG |
503 | while (inst->next && (random() & 1)) { |
504 | prev = inst; |
505 | inst = inst->next; |
506 | } |
507 | #endif |
508 | inst->exit_status = 0; |
509 | goto ret_inst; |
510 | } |
511 | |
512 | /* |
513 | * gcc -Wall fails saving throw against stupidity |
514 | * (inst and prev are thought to be uninitialized variables) |
515 | */ |
516 | inst = prev = NULL; |
517 | |
518 | do { |
519 | pid = waitpid(-1, &status, flags); |
520 | kill_all_if_cancel_requested(); |
521 | if (pid == 0 && (flags & WNOHANG)) |
522 | return NULL; |
523 | if (pid < 0) { |
524 | if (errno == EINTR || errno == EAGAIN) |
525 | continue; |
526 | if (errno == ECHILD) { |
527 | bb_error_msg("wait: no more child process?!?"); |
528 | return NULL; |
529 | } |
530 | bb_perror_msg("wait"); |
531 | continue; |
532 | } |
533 | prev = NULL; |
534 | inst = instance_list; |
535 | while (inst) { |
536 | if (inst->pid == pid) |
537 | break; |
538 | prev = inst; |
539 | inst = inst->next; |
540 | } |
541 | } while (!inst); |
542 | |
543 | if (WIFEXITED(status)) |
544 | status = WEXITSTATUS(status); |
545 | else if (WIFSIGNALED(status)) { |
546 | sig = WTERMSIG(status); |
547 | status = EXIT_UNCORRECTED; |
548 | if (sig != SIGINT) { |
549 | printf("Warning... %s %s exited " |
550 | "with signal %d\n", |
551 | inst->prog, inst->device, sig); |
552 | status = EXIT_ERROR; |
553 | } |
554 | } else { |
555 | printf("%s %s: status is %x, should never happen\n", |
556 | inst->prog, inst->device, status); |
557 | status = EXIT_ERROR; |
558 | } |
559 | inst->exit_status = status; |
560 | |
561 | #if DO_PROGRESS_INDICATOR |
562 | if (progress && (inst->flags & FLAG_PROGRESS) && !progress_active()) { |
563 | struct fsck_instance *inst2; |
564 | for (inst2 = instance_list; inst2; inst2 = inst2->next) { |
565 | if (inst2->flags & FLAG_DONE) |
566 | continue; |
567 | if (strcmp(inst2->type, "ext2") != 0 |
568 | && strcmp(inst2->type, "ext3") != 0 |
569 | ) { |
570 | continue; |
571 | } |
572 | /* ext[23], we will send USR1 |
573 | * (request to start displaying progress bar) |
574 | * |
575 | * If we've just started the fsck, wait a tiny |
576 | * bit before sending the kill, to give it |
577 | * time to set up the signal handler |
578 | */ |
579 | if (inst2->start_time >= time(NULL) - 1) |
580 | sleep(1); |
581 | kill(inst2->pid, SIGUSR1); |
582 | inst2->flags |= FLAG_PROGRESS; |
583 | break; |
584 | } |
585 | } |
586 | #endif |
587 | |
588 | ret_inst: |
589 | if (prev) |
590 | prev->next = inst->next; |
591 | else |
592 | instance_list = inst->next; |
593 | if (verbose > 1) |
594 | printf("Finished with %s (exit status %d)\n", |
595 | inst->device, inst->exit_status); |
596 | num_running--; |
597 | return inst; |
598 | } |
599 | |
600 | #define FLAG_WAIT_ALL 0 |
601 | #define FLAG_WAIT_ATLEAST_ONE 1 |
602 | /* |
603 | * Wait until all executing child processes have exited; return the |
604 | * logical OR of all of their exit code values. |
605 | */ |
606 | static int wait_many(int flags) |
607 | { |
608 | struct fsck_instance *inst; |
609 | int global_status = 0; |
610 | int wait_flags = 0; |
611 | |
612 | while ((inst = wait_one(wait_flags))) { |
613 | global_status |= inst->exit_status; |
614 | free_instance(inst); |
615 | #ifdef RANDOM_DEBUG |
616 | if (noexecute && (flags & WNOHANG) && !(random() % 3)) |
617 | break; |
618 | #endif |
619 | if (flags & FLAG_WAIT_ATLEAST_ONE) |
620 | wait_flags = WNOHANG; |
621 | } |
622 | return global_status; |
623 | } |
624 | |
625 | /* |
626 | * Execute a particular fsck program, and link it into the list of |
627 | * child processes we are waiting for. |
628 | */ |
629 | static void execute(const char *type, const char *device, const char *mntpt, |
630 | int interactive) |
631 | { |
632 | char *argv[num_args + 4]; /* see count below: */ |
633 | int argc; |
634 | int i; |
635 | struct fsck_instance *inst; |
636 | pid_t pid; |
637 | |
638 | inst = xzalloc(sizeof(*inst)); |
639 | |
640 | argv[0] = xasprintf("fsck.%s", type); /* 1 */ |
641 | for (i = 0; i < num_args; i++) |
642 | argv[i+1] = args[i]; /* num_args */ |
643 | argc = num_args + 1; |
644 | |
645 | #if DO_PROGRESS_INDICATOR |
646 | if (progress && !progress_active()) { |
647 | if (strcmp(type, "ext2") == 0 |
648 | || strcmp(type, "ext3") == 0 |
649 | ) { |
650 | argv[argc++] = xasprintf("-C%d", progress_fd); /* 1 */ |
651 | inst->flags |= FLAG_PROGRESS; |
652 | } |
653 | } |
654 | #endif |
655 | |
656 | argv[argc++] = xstrdup(device); /* 1 */ |
657 | argv[argc] = NULL; /* 1 */ |
658 | |
659 | if (verbose || noexecute) { |
660 | printf("[%s (%d) -- %s]", argv[0], num_running, |
661 | mntpt ? mntpt : device); |
662 | for (i = 0; i < argc; i++) |
663 | printf(" %s", argv[i]); |
664 | puts(""); |
665 | } |
666 | |
667 | /* Fork and execute the correct program. */ |
668 | pid = -1; |
669 | if (!noexecute) { |
670 | pid = fork(); /* TODO: NOMMU friendly way (vfork)? */ |
671 | if (pid < 0) |
672 | bb_perror_msg_and_die("fork"); |
673 | if (pid == 0) { |
674 | /* Child */ |
675 | if (!interactive) { |
676 | /* NB: e2fsck will complain because of this! |
677 | * Use "fsck -s" to avoid... */ |
678 | close(0); |
679 | } |
680 | execvp(argv[0], argv); |
681 | bb_perror_msg_and_die("%s", argv[0]); |
682 | } |
683 | } |
684 | |
685 | for (i = num_args+1; i < argc; i++) |
686 | free(argv[i]); |
687 | |
688 | inst->pid = pid; |
689 | inst->prog = argv[0]; |
690 | inst->type = xstrdup(type); |
691 | inst->device = xstrdup(device); |
692 | inst->base_device = base_device(device); |
693 | inst->start_time = time(NULL); |
694 | |
695 | /* Add to the list of running fsck's. |
696 | * (was adding to the end, but adding to the front is simpler...) */ |
697 | inst->next = instance_list; |
698 | instance_list = inst; |
699 | } |
700 | |
701 | /* |
702 | * Run the fsck program on a particular device |
703 | * |
704 | * If the type is specified using -t, and it isn't prefixed with "no" |
705 | * (as in "noext2") and only one filesystem type is specified, then |
706 | * use that type regardless of what is specified in /etc/fstab. |
707 | * |
708 | * If the type isn't specified by the user, then use either the type |
709 | * specified in /etc/fstab, or "auto". |
710 | */ |
711 | static void fsck_device(struct fs_info *fs, int interactive) |
712 | { |
713 | const char *type; |
714 | |
715 | if (strcmp(fs->type, "auto") != 0) { |
716 | type = fs->type; |
717 | if (verbose > 2) |
718 | bb_info_msg("using filesystem type '%s' %s", |
719 | type, "from fstab"); |
720 | } else if (fstype |
721 | && (fstype[0] != 'n' || fstype[1] != 'o') /* != "no" */ |
722 | && strncmp(fstype, "opts=", 5) != 0 |
723 | && strncmp(fstype, "loop", 4) != 0 |
724 | && !strchr(fstype, ',') |
725 | ) { |
726 | type = fstype; |
727 | if (verbose > 2) |
728 | bb_info_msg("using filesystem type '%s' %s", |
729 | type, "from -t"); |
730 | } else { |
731 | type = "auto"; |
732 | if (verbose > 2) |
733 | bb_info_msg("using filesystem type '%s' %s", |
734 | type, "(default)"); |
735 | } |
736 | |
737 | num_running++; |
738 | execute(type, fs->device, fs->mountpt, interactive); |
739 | } |
740 | |
741 | /* |
742 | * Returns TRUE if a partition on the same disk is already being |
743 | * checked. |
744 | */ |
745 | static int device_already_active(char *device) |
746 | { |
747 | struct fsck_instance *inst; |
748 | char *base; |
749 | |
750 | if (force_all_parallel) |
751 | return 0; |
752 | |
753 | #ifdef BASE_MD |
754 | /* Don't check a soft raid disk with any other disk */ |
755 | if (instance_list |
756 | && (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) |
757 | || !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)) |
758 | ) { |
759 | return 1; |
760 | } |
761 | #endif |
762 | |
763 | base = base_device(device); |
764 | /* |
765 | * If we don't know the base device, assume that the device is |
766 | * already active if there are any fsck instances running. |
767 | */ |
768 | if (!base) |
769 | return (instance_list != NULL); |
770 | |
771 | for (inst = instance_list; inst; inst = inst->next) { |
772 | if (!inst->base_device || !strcmp(base, inst->base_device)) { |
773 | free(base); |
774 | return 1; |
775 | } |
776 | } |
777 | |
778 | free(base); |
779 | return 0; |
780 | } |
781 | |
782 | /* |
783 | * This function returns true if a particular option appears in a |
784 | * comma-delimited options list |
785 | */ |
786 | static int opt_in_list(char *opt, char *optlist) |
787 | { |
788 | char *s; |
789 | int len; |
790 | |
791 | if (!optlist) |
792 | return 0; |
793 | |
794 | len = strlen(opt); |
795 | s = optlist - 1; |
796 | while (1) { |
797 | s = strstr(s + 1, opt); |
798 | if (!s) |
799 | return 0; |
800 | /* neither "opt.." nor "xxx,opt.."? */ |
801 | if (s != optlist && s[-1] != ',') |
802 | continue; |
803 | /* neither "..opt" nor "..opt,xxx"? */ |
804 | if (s[len] != '\0' && s[len] != ',') |
805 | continue; |
806 | return 1; |
807 | } |
808 | } |
809 | |
810 | /* See if the filesystem matches the criteria given by the -t option */ |
811 | static int fs_match(struct fs_info *fs) |
812 | { |
813 | int n, ret, checked_type; |
814 | char *cp; |
815 | |
816 | if (!fs_type_list) |
817 | return 1; |
818 | |
819 | ret = 0; |
820 | checked_type = 0; |
821 | n = 0; |
822 | while (1) { |
823 | cp = fs_type_list[n]; |
824 | if (!cp) |
825 | break; |
826 | switch (fs_type_flag[n]) { |
827 | case FS_TYPE_FLAG_NORMAL: |
828 | checked_type++; |
829 | if (strcmp(cp, fs->type) == 0) |
830 | ret = 1; |
831 | break; |
832 | case FS_TYPE_FLAG_NEGOPT: |
833 | if (opt_in_list(cp, fs->opts)) |
834 | return 0; |
835 | break; |
836 | case FS_TYPE_FLAG_OPT: |
837 | if (!opt_in_list(cp, fs->opts)) |
838 | return 0; |
839 | break; |
840 | } |
841 | n++; |
842 | } |
843 | if (checked_type == 0) |
844 | return 1; |
845 | |
846 | return (fs_type_negated ? !ret : ret); |
847 | } |
848 | |
849 | /* Check if we should ignore this filesystem. */ |
850 | static int ignore(struct fs_info *fs) |
851 | { |
852 | /* |
853 | * If the pass number is 0, ignore it. |
854 | */ |
855 | if (fs->passno == 0) |
856 | return 1; |
857 | |
858 | /* |
859 | * If a specific fstype is specified, and it doesn't match, |
860 | * ignore it. |
861 | */ |
862 | if (!fs_match(fs)) |
863 | return 1; |
864 | |
865 | /* Are we ignoring this type? */ |
866 | if (index_in_str_array(ignored_types, fs->type) >= 0) |
867 | return 1; |
868 | |
869 | /* We can and want to check this file system type. */ |
870 | return 0; |
871 | } |
872 | |
873 | /* Check all file systems, using the /etc/fstab table. */ |
874 | static int check_all(void) |
875 | { |
876 | struct fs_info *fs; |
877 | int status = EXIT_OK; |
878 | smallint not_done_yet; |
879 | smallint pass_done; |
880 | int passno; |
881 | |
882 | if (verbose) |
883 | puts("Checking all filesystems"); |
884 | |
885 | /* |
886 | * Do an initial scan over the filesystem; mark filesystems |
887 | * which should be ignored as done, and resolve any "auto" |
888 | * filesystem types (done as a side-effect of calling ignore()). |
889 | */ |
890 | for (fs = filesys_info; fs; fs = fs->next) { |
891 | if (ignore(fs)) |
892 | fs->flags |= FLAG_DONE; |
893 | } |
894 | |
895 | /* |
896 | * Find and check the root filesystem. |
897 | */ |
898 | if (!parallel_root) { |
899 | for (fs = filesys_info; fs; fs = fs->next) { |
900 | if (LONE_CHAR(fs->mountpt, '/')) |
901 | break; |
902 | } |
903 | if (fs) { |
904 | if (!skip_root && !ignore(fs)) { |
905 | fsck_device(fs, 1); |
906 | status |= wait_many(FLAG_WAIT_ALL); |
907 | if (status > EXIT_NONDESTRUCT) |
908 | return status; |
909 | } |
910 | fs->flags |= FLAG_DONE; |
911 | } |
912 | } |
913 | /* |
914 | * This is for the bone-headed user who enters the root |
915 | * filesystem twice. Skip root will skip all root entries. |
916 | */ |
917 | if (skip_root) |
918 | for (fs = filesys_info; fs; fs = fs->next) |
919 | if (LONE_CHAR(fs->mountpt, '/')) |
920 | fs->flags |= FLAG_DONE; |
921 | |
922 | not_done_yet = 1; |
923 | passno = 1; |
924 | while (not_done_yet) { |
925 | not_done_yet = 0; |
926 | pass_done = 1; |
927 | |
928 | for (fs = filesys_info; fs; fs = fs->next) { |
929 | if (cancel_requested) |
930 | break; |
931 | if (fs->flags & FLAG_DONE) |
932 | continue; |
933 | /* |
934 | * If the filesystem's pass number is higher |
935 | * than the current pass number, then we don't |
936 | * do it yet. |
937 | */ |
938 | if (fs->passno > passno) { |
939 | not_done_yet = 1; |
940 | continue; |
941 | } |
942 | /* |
943 | * If a filesystem on a particular device has |
944 | * already been spawned, then we need to defer |
945 | * this to another pass. |
946 | */ |
947 | if (device_already_active(fs->device)) { |
948 | pass_done = 0; |
949 | continue; |
950 | } |
951 | /* |
952 | * Spawn off the fsck process |
953 | */ |
954 | fsck_device(fs, serialize); |
955 | fs->flags |= FLAG_DONE; |
956 | |
957 | /* |
958 | * Only do one filesystem at a time, or if we |
959 | * have a limit on the number of fsck's extant |
960 | * at one time, apply that limit. |
961 | */ |
962 | if (serialize |
963 | || (max_running && (num_running >= max_running)) |
964 | ) { |
965 | pass_done = 0; |
966 | break; |
967 | } |
968 | } |
969 | if (cancel_requested) |
970 | break; |
971 | if (verbose > 1) |
972 | printf("--waiting-- (pass %d)\n", passno); |
973 | status |= wait_many(pass_done ? FLAG_WAIT_ALL : |
974 | FLAG_WAIT_ATLEAST_ONE); |
975 | if (pass_done) { |
976 | if (verbose > 1) |
977 | puts("----------------------------------"); |
978 | passno++; |
979 | } else |
980 | not_done_yet = 1; |
981 | } |
982 | kill_all_if_cancel_requested(); |
983 | status |= wait_many(FLAG_WAIT_ATLEAST_ONE); |
984 | return status; |
985 | } |
986 | |
987 | /* |
988 | * Deal with the fsck -t argument. |
989 | * Huh, for mount "-t novfat,nfs" means "neither vfat nor nfs"! |
990 | * Why here we require "-t novfat,nonfs" ?? |
991 | */ |
992 | static void compile_fs_type(char *fs_type) |
993 | { |
994 | char *s; |
995 | int num = 2; |
996 | smallint negate; |
997 | |
998 | if (fs_type) { |
999 | s = fs_type; |
1000 | while ((s = strchr(s, ','))) { |
1001 | num++; |
1002 | s++; |
1003 | } |
1004 | } |
1005 | |
1006 | fs_type_list = xzalloc(num * sizeof(fs_type_list[0])); |
1007 | fs_type_flag = xzalloc(num * sizeof(fs_type_flag[0])); |
1008 | fs_type_negated = -1; /* not yet known is it negated or not */ |
1009 | |
1010 | if (!fs_type) |
1011 | return; |
1012 | |
1013 | num = 0; |
1014 | s = fs_type; |
1015 | while (1) { |
1016 | char *comma; |
1017 | |
1018 | negate = 0; |
1019 | if (s[0] == 'n' && s[1] == 'o') { /* "no.." */ |
1020 | s += 2; |
1021 | negate = 1; |
1022 | } else if (s[0] == '!') { |
1023 | s++; |
1024 | negate = 1; |
1025 | } |
1026 | |
1027 | if (strcmp(s, "loop") == 0) |
1028 | /* loop is really short-hand for opts=loop */ |
1029 | goto loop_special_case; |
1030 | if (strncmp(s, "opts=", 5) == 0) { |
1031 | s += 5; |
1032 | loop_special_case: |
1033 | fs_type_flag[num] = negate ? FS_TYPE_FLAG_NEGOPT : FS_TYPE_FLAG_OPT; |
1034 | } else { |
1035 | if (fs_type_negated == -1) |
1036 | fs_type_negated = negate; |
1037 | if (fs_type_negated != negate) |
1038 | bb_error_msg_and_die( |
1039 | "either all or none of the filesystem types passed to -t must be prefixed " |
1040 | "with 'no' or '!'"); |
1041 | } |
1042 | comma = strchr(s, ','); |
1043 | fs_type_list[num++] = comma ? xstrndup(s, comma-s) : xstrdup(s); |
1044 | if (!comma) |
1045 | break; |
1046 | s = comma + 1; |
1047 | } |
1048 | } |
1049 | |
1050 | static void parse_args(int argc, char *argv[]) |
1051 | { |
1052 | int i, j; |
1053 | char *arg, *tmp; |
1054 | char *options = NULL; |
1055 | int optpos = 0; |
1056 | int opts_for_fsck = 0; |
1057 | |
1058 | /* in bss, so already zeroed |
1059 | num_devices = 0; |
1060 | num_args = 0; |
1061 | instance_list = NULL; |
1062 | */ |
1063 | |
1064 | /* TODO: getopt32 */ |
1065 | for (i = 1; i < argc; i++) { |
1066 | arg = argv[i]; |
1067 | |
1068 | /* "/dev/blk" or "/path" or "UUID=xxx" or "LABEL=xxx" */ |
1069 | if ((arg[0] == '/' && !opts_for_fsck) || strchr(arg, '=')) { |
1070 | // FIXME: must check that arg is a blkdev, or resolve |
1071 | // "/path", "UUID=xxx" or "LABEL=xxx" into block device name |
1072 | // ("UUID=xxx"/"LABEL=xxx" can probably shifted to fsck.auto duties) |
1073 | devices = xrealloc(devices, (num_devices+1) * sizeof(devices[0])); |
1074 | devices[num_devices++] = xstrdup(arg); |
1075 | continue; |
1076 | } |
1077 | |
1078 | if (arg[0] != '-' || opts_for_fsck) { |
1079 | args = xrealloc(args, (num_args+1) * sizeof(args[0])); |
1080 | args[num_args++] = xstrdup(arg); |
1081 | continue; |
1082 | } |
1083 | |
1084 | for (j = 1; arg[j]; j++) { |
1085 | if (opts_for_fsck) { |
1086 | optpos++; |
1087 | /* one extra for '\0' */ |
1088 | options = xrealloc(options, optpos + 2); |
1089 | options[optpos] = arg[j]; |
1090 | continue; |
1091 | } |
1092 | switch (arg[j]) { |
1093 | case 'A': |
1094 | doall = 1; |
1095 | break; |
1096 | #if DO_PROGRESS_INDICATOR |
1097 | case 'C': |
1098 | progress = 1; |
1099 | if (arg[++j]) { /* -Cn */ |
1100 | progress_fd = xatoi_u(&arg[j]); |
1101 | goto next_arg; |
1102 | } |
1103 | /* -C n */ |
1104 | progress_fd = xatoi_u(argv[++i]); |
1105 | goto next_arg; |
1106 | #endif |
1107 | case 'V': |
1108 | verbose++; |
1109 | break; |
1110 | case 'N': |
1111 | noexecute = 1; |
1112 | break; |
1113 | case 'R': |
1114 | skip_root = 1; |
1115 | break; |
1116 | case 'T': |
1117 | notitle = 1; |
1118 | break; |
1119 | /* case 'M': |
1120 | like_mount = 1; |
1121 | break; */ |
1122 | case 'P': |
1123 | parallel_root = 1; |
1124 | break; |
1125 | case 's': |
1126 | serialize = 1; |
1127 | break; |
1128 | case 't': |
1129 | if (fstype) |
1130 | bb_show_usage(); |
1131 | if (arg[++j]) |
1132 | tmp = &arg[j]; |
1133 | else if (++i < argc) |
1134 | tmp = argv[i]; |
1135 | else |
1136 | bb_show_usage(); |
1137 | fstype = xstrdup(tmp); |
1138 | compile_fs_type(fstype); |
1139 | goto next_arg; |
1140 | case '-': |
1141 | opts_for_fsck++; |
1142 | break; |
1143 | case '?': |
1144 | bb_show_usage(); |
1145 | break; |
1146 | default: |
1147 | optpos++; |
1148 | /* one extra for '\0' */ |
1149 | options = xrealloc(options, optpos + 2); |
1150 | options[optpos] = arg[j]; |
1151 | break; |
1152 | } |
1153 | } |
1154 | next_arg: |
1155 | if (optpos) { |
1156 | options[0] = '-'; |
1157 | options[optpos + 1] = '\0'; |
1158 | args = xrealloc(args, (num_args+1) * sizeof(args[0])); |
1159 | args[num_args++] = options; |
1160 | optpos = 0; |
1161 | options = NULL; |
1162 | } |
1163 | } |
1164 | if (getenv("FSCK_FORCE_ALL_PARALLEL")) |
1165 | force_all_parallel = 1; |
1166 | tmp = getenv("FSCK_MAX_INST"); |
1167 | if (tmp) |
1168 | max_running = xatoi(tmp); |
1169 | } |
1170 | |
1171 | static void signal_cancel(int sig ATTRIBUTE_UNUSED) |
1172 | { |
1173 | cancel_requested = 1; |
1174 | } |
1175 | |
1176 | int fsck_main(int argc, char *argv[]) |
1177 | { |
1178 | int i, status = 0; |
1179 | int interactive; |
1180 | const char *fstab; |
1181 | struct fs_info *fs; |
1182 | struct sigaction sa; |
1183 | |
1184 | memset(&sa, 0, sizeof(sa)); |
1185 | sa.sa_handler = signal_cancel; |
1186 | sigaction(SIGINT, &sa, 0); |
1187 | sigaction(SIGTERM, &sa, 0); |
1188 | |
1189 | setbuf(stdout, NULL); |
1190 | |
1191 | parse_args(argc, argv); |
1192 | |
1193 | if (!notitle) |
1194 | puts("fsck (busybox "BB_VER", "BB_BT")"); |
1195 | |
1196 | /* Even plain "fsck /dev/hda1" needs fstab to get fs type, |
1197 | * so we are scanning it anyway */ |
1198 | fstab = getenv("FSTAB_FILE"); |
1199 | if (!fstab) |
1200 | fstab = "/etc/fstab"; |
1201 | load_fs_info(fstab); |
1202 | |
1203 | interactive = (num_devices == 1) | serialize; |
1204 | |
1205 | /* If -A was specified ("check all"), do that! */ |
1206 | if (doall) |
1207 | return check_all(); |
1208 | |
1209 | if (num_devices == 0) { |
1210 | serialize = 1; |
1211 | interactive = 1; |
1212 | return check_all(); |
1213 | } |
1214 | |
1215 | for (i = 0; i < num_devices; i++) { |
1216 | if (cancel_requested) { |
1217 | kill_all_if_cancel_requested(); |
1218 | break; |
1219 | } |
1220 | |
1221 | fs = lookup(devices[i]); |
1222 | if (!fs) |
1223 | fs = create_fs_device(devices[i], 0, "auto", 0, -1, -1); |
1224 | fsck_device(fs, interactive); |
1225 | |
1226 | if (serialize |
1227 | || (max_running && (num_running >= max_running)) |
1228 | ) { |
1229 | struct fsck_instance *inst; |
1230 | |
1231 | inst = wait_one(0); |
1232 | if (inst) { |
1233 | status |= inst->exit_status; |
1234 | free_instance(inst); |
1235 | } |
1236 | if (verbose > 1) |
1237 | puts("----------------------------------"); |
1238 | } |
1239 | } |
1240 | status |= wait_many(FLAG_WAIT_ALL); |
1241 | return status; |
1242 | } |