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1 | /* | |
2 | * util.c --- miscellaneous utilities | |
3 | * | |
4 | * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. | |
5 | * | |
6 | * %Begin-Header% | |
7 | * This file may be redistributed under the terms of the GNU Public | |
8 | * License. | |
9 | * %End-Header% | |
10 | */ | |
11 | ||
12 | #include "config.h" | |
13 | #include <stdlib.h> | |
14 | #include <stdio.h> | |
15 | #include <unistd.h> | |
16 | #include <string.h> | |
17 | #include <ctype.h> | |
18 | #ifdef __linux__ | |
19 | #include <sys/utsname.h> | |
20 | #endif | |
21 | ||
22 | #ifdef HAVE_CONIO_H | |
23 | #undef HAVE_TERMIOS_H | |
24 | #include <conio.h> | |
25 | #define read_a_char() getch() | |
26 | #else | |
27 | #ifdef HAVE_TERMIOS_H | |
28 | #include <termios.h> | |
29 | #endif | |
30 | #endif | |
31 | ||
32 | #ifdef HAVE_MALLOC_H | |
33 | #include <malloc.h> | |
34 | #endif | |
35 | ||
36 | #ifdef HAVE_ERRNO_H | |
37 | #include <errno.h> | |
38 | #endif | |
39 | ||
40 | #include "e2fsck.h" | |
41 | ||
42 | extern e2fsck_t e2fsck_global_ctx; /* Try your very best not to use this! */ | |
43 | ||
44 | #include <stdarg.h> | |
45 | #include <time.h> | |
46 | #include <sys/time.h> | |
47 | #include <sys/resource.h> | |
48 | ||
49 | void fatal_error(e2fsck_t ctx, const char *msg) | |
50 | { | |
51 | ext2_filsys fs = ctx->fs; | |
52 | int exit_value = FSCK_ERROR; | |
53 | ||
54 | if (msg) | |
55 | fprintf (stderr, "e2fsck: %s\n", msg); | |
56 | if (!fs) | |
57 | goto out; | |
58 | if (fs->io && fs->super) { | |
59 | ext2fs_mmp_stop(ctx->fs); | |
60 | if (ctx->fs->io->magic == EXT2_ET_MAGIC_IO_CHANNEL) | |
61 | io_channel_flush(ctx->fs->io); | |
62 | else | |
63 | log_err(ctx, "e2fsck: io manager magic bad!\n"); | |
64 | } | |
65 | if (ext2fs_test_changed(fs)) { | |
66 | exit_value |= FSCK_NONDESTRUCT; | |
67 | log_out(ctx, _("\n%s: ***** FILE SYSTEM WAS MODIFIED *****\n"), | |
68 | ctx->device_name); | |
69 | if (ctx->mount_flags & EXT2_MF_ISROOT) | |
70 | exit_value |= FSCK_REBOOT; | |
71 | } | |
72 | if (!ext2fs_test_valid(fs)) { | |
73 | log_out(ctx, _("\n%s: ********** WARNING: Filesystem still has " | |
74 | "errors **********\n\n"), ctx->device_name); | |
75 | exit_value |= FSCK_UNCORRECTED; | |
76 | exit_value &= ~FSCK_NONDESTRUCT; | |
77 | } | |
78 | out: | |
79 | ctx->flags |= E2F_FLAG_ABORT; | |
80 | if (ctx->flags & E2F_FLAG_SETJMP_OK) | |
81 | longjmp(ctx->abort_loc, 1); | |
82 | exit(exit_value); | |
83 | } | |
84 | ||
85 | void log_out(e2fsck_t ctx, const char *fmt, ...) | |
86 | { | |
87 | va_list pvar; | |
88 | ||
89 | va_start(pvar, fmt); | |
90 | vprintf(fmt, pvar); | |
91 | va_end(pvar); | |
92 | if (ctx->logf) { | |
93 | va_start(pvar, fmt); | |
94 | vfprintf(ctx->logf, fmt, pvar); | |
95 | va_end(pvar); | |
96 | } | |
97 | } | |
98 | ||
99 | void log_err(e2fsck_t ctx, const char *fmt, ...) | |
100 | { | |
101 | va_list pvar; | |
102 | ||
103 | va_start(pvar, fmt); | |
104 | vfprintf(stderr, fmt, pvar); | |
105 | va_end(pvar); | |
106 | if (ctx->logf) { | |
107 | va_start(pvar, fmt); | |
108 | vfprintf(ctx->logf, fmt, pvar); | |
109 | va_end(pvar); | |
110 | } | |
111 | } | |
112 | ||
113 | void *e2fsck_allocate_memory(e2fsck_t ctx, unsigned int size, | |
114 | const char *description) | |
115 | { | |
116 | void *ret; | |
117 | char buf[256]; | |
118 | ||
119 | #ifdef DEBUG_ALLOCATE_MEMORY | |
120 | printf("Allocating %u bytes for %s...\n", size, description); | |
121 | #endif | |
122 | ret = malloc(size); | |
123 | if (!ret) { | |
124 | sprintf(buf, "Can't allocate %u bytes for %s\n", | |
125 | size, description); | |
126 | fatal_error(ctx, buf); | |
127 | } | |
128 | memset(ret, 0, size); | |
129 | return ret; | |
130 | } | |
131 | ||
132 | char *string_copy(e2fsck_t ctx EXT2FS_ATTR((unused)), | |
133 | const char *str, int len) | |
134 | { | |
135 | char *ret; | |
136 | ||
137 | if (!str) | |
138 | return NULL; | |
139 | if (!len) | |
140 | len = strlen(str); | |
141 | ret = malloc(len+1); | |
142 | if (ret) { | |
143 | strncpy(ret, str, len); | |
144 | ret[len] = 0; | |
145 | } | |
146 | return ret; | |
147 | } | |
148 | ||
149 | #ifndef HAVE_STRNLEN | |
150 | /* | |
151 | * Incredibly, libc5 doesn't appear to have strnlen. So we have to | |
152 | * provide our own. | |
153 | */ | |
154 | int e2fsck_strnlen(const char * s, int count) | |
155 | { | |
156 | const char *cp = s; | |
157 | ||
158 | while (count-- && *cp) | |
159 | cp++; | |
160 | return cp - s; | |
161 | } | |
162 | #endif | |
163 | ||
164 | #ifndef HAVE_CONIO_H | |
165 | static int read_a_char(void) | |
166 | { | |
167 | char c; | |
168 | int r; | |
169 | int fail = 0; | |
170 | ||
171 | while(1) { | |
172 | if (e2fsck_global_ctx && | |
173 | (e2fsck_global_ctx->flags & E2F_FLAG_CANCEL)) { | |
174 | return 3; | |
175 | } | |
176 | r = read(0, &c, 1); | |
177 | if (r == 1) | |
178 | return c; | |
179 | if (fail++ > 100) | |
180 | break; | |
181 | } | |
182 | return EOF; | |
183 | } | |
184 | #endif | |
185 | ||
186 | int ask_yn(e2fsck_t ctx, const char * string, int def) | |
187 | { | |
188 | int c; | |
189 | const char *defstr; | |
190 | const char *short_yes = _("yY"); | |
191 | const char *short_no = _("nN"); | |
192 | ||
193 | #ifdef HAVE_TERMIOS_H | |
194 | struct termios termios, tmp; | |
195 | ||
196 | tcgetattr (0, &termios); | |
197 | tmp = termios; | |
198 | tmp.c_lflag &= ~(ICANON | ECHO); | |
199 | tmp.c_cc[VMIN] = 1; | |
200 | tmp.c_cc[VTIME] = 0; | |
201 | tcsetattr (0, TCSANOW, &tmp); | |
202 | #endif | |
203 | ||
204 | if (def == 1) | |
205 | defstr = _(_("<y>")); | |
206 | else if (def == 0) | |
207 | defstr = _(_("<n>")); | |
208 | else | |
209 | defstr = _(" (y/n)"); | |
210 | log_out(ctx, "%s%s? ", string, defstr); | |
211 | while (1) { | |
212 | fflush (stdout); | |
213 | if ((c = read_a_char()) == EOF) | |
214 | break; | |
215 | if (c == 3) { | |
216 | #ifdef HAVE_TERMIOS_H | |
217 | tcsetattr (0, TCSANOW, &termios); | |
218 | #endif | |
219 | if (ctx->flags & E2F_FLAG_SETJMP_OK) { | |
220 | log_out(ctx, "\n"); | |
221 | longjmp(e2fsck_global_ctx->abort_loc, 1); | |
222 | } | |
223 | log_out(ctx, "%s", _("cancelled!\n")); | |
224 | return 0; | |
225 | } | |
226 | if (strchr(short_yes, (char) c)) { | |
227 | def = 1; | |
228 | break; | |
229 | } | |
230 | else if (strchr(short_no, (char) c)) { | |
231 | def = 0; | |
232 | break; | |
233 | } | |
234 | else if ((c == 27 || c == ' ' || c == '\n') && (def != -1)) | |
235 | break; | |
236 | } | |
237 | if (def) | |
238 | log_out(ctx, "%s", _("yes\n")); | |
239 | else | |
240 | log_out(ctx, "%s", _("no\n")); | |
241 | #ifdef HAVE_TERMIOS_H | |
242 | tcsetattr (0, TCSANOW, &termios); | |
243 | #endif | |
244 | return def; | |
245 | } | |
246 | ||
247 | int ask (e2fsck_t ctx, const char * string, int def) | |
248 | { | |
249 | if (ctx->options & E2F_OPT_NO) { | |
250 | log_out(ctx, _("%s? no\n\n"), string); | |
251 | return 0; | |
252 | } | |
253 | if (ctx->options & E2F_OPT_YES) { | |
254 | log_out(ctx, _("%s? yes\n\n"), string); | |
255 | return 1; | |
256 | } | |
257 | if (ctx->options & E2F_OPT_PREEN) { | |
258 | log_out(ctx, "%s? %s\n\n", string, def ? _("yes") : _("no")); | |
259 | return def; | |
260 | } | |
261 | return ask_yn(ctx, string, def); | |
262 | } | |
263 | ||
264 | void e2fsck_read_bitmaps(e2fsck_t ctx) | |
265 | { | |
266 | ext2_filsys fs = ctx->fs; | |
267 | errcode_t retval; | |
268 | const char *old_op; | |
269 | unsigned int save_type; | |
270 | ||
271 | if (ctx->invalid_bitmaps) { | |
272 | com_err(ctx->program_name, 0, | |
273 | _("e2fsck_read_bitmaps: illegal bitmap block(s) for %s"), | |
274 | ctx->device_name); | |
275 | fatal_error(ctx, 0); | |
276 | } | |
277 | ||
278 | old_op = ehandler_operation(_("reading inode and block bitmaps")); | |
279 | e2fsck_set_bitmap_type(fs, EXT2FS_BMAP64_RBTREE, "fs_bitmaps", | |
280 | &save_type); | |
281 | retval = ext2fs_read_bitmaps(fs); | |
282 | fs->default_bitmap_type = save_type; | |
283 | ehandler_operation(old_op); | |
284 | if (retval) { | |
285 | com_err(ctx->program_name, retval, | |
286 | _("while retrying to read bitmaps for %s"), | |
287 | ctx->device_name); | |
288 | fatal_error(ctx, 0); | |
289 | } | |
290 | } | |
291 | ||
292 | void e2fsck_write_bitmaps(e2fsck_t ctx) | |
293 | { | |
294 | ext2_filsys fs = ctx->fs; | |
295 | errcode_t retval; | |
296 | const char *old_op; | |
297 | ||
298 | old_op = ehandler_operation(_("writing block and inode bitmaps")); | |
299 | retval = ext2fs_write_bitmaps(fs); | |
300 | ehandler_operation(old_op); | |
301 | if (retval) { | |
302 | com_err(ctx->program_name, retval, | |
303 | _("while rewriting block and inode bitmaps for %s"), | |
304 | ctx->device_name); | |
305 | fatal_error(ctx, 0); | |
306 | } | |
307 | } | |
308 | ||
309 | void preenhalt(e2fsck_t ctx) | |
310 | { | |
311 | ext2_filsys fs = ctx->fs; | |
312 | ||
313 | if (!(ctx->options & E2F_OPT_PREEN)) | |
314 | return; | |
315 | log_err(ctx, _("\n\n%s: UNEXPECTED INCONSISTENCY; " | |
316 | "RUN fsck MANUALLY.\n\t(i.e., without -a or -p options)\n"), | |
317 | ctx->device_name); | |
318 | ctx->flags |= E2F_FLAG_EXITING; | |
319 | if (fs != NULL) { | |
320 | fs->super->s_state |= EXT2_ERROR_FS; | |
321 | ext2fs_mark_super_dirty(fs); | |
322 | ext2fs_close(fs); | |
323 | } | |
324 | exit(FSCK_UNCORRECTED); | |
325 | } | |
326 | ||
327 | #ifdef RESOURCE_TRACK | |
328 | void init_resource_track(struct resource_track *track, io_channel channel) | |
329 | { | |
330 | #ifdef HAVE_GETRUSAGE | |
331 | struct rusage r; | |
332 | #endif | |
333 | io_stats io_start = 0; | |
334 | ||
335 | track->brk_start = sbrk(0); | |
336 | gettimeofday(&track->time_start, 0); | |
337 | #ifdef HAVE_GETRUSAGE | |
338 | #ifdef sun | |
339 | memset(&r, 0, sizeof(struct rusage)); | |
340 | #endif | |
341 | getrusage(RUSAGE_SELF, &r); | |
342 | track->user_start = r.ru_utime; | |
343 | track->system_start = r.ru_stime; | |
344 | #else | |
345 | track->user_start.tv_sec = track->user_start.tv_usec = 0; | |
346 | track->system_start.tv_sec = track->system_start.tv_usec = 0; | |
347 | #endif | |
348 | track->bytes_read = 0; | |
349 | track->bytes_written = 0; | |
350 | if (channel && channel->manager && channel->manager->get_stats) | |
351 | channel->manager->get_stats(channel, &io_start); | |
352 | if (io_start) { | |
353 | track->bytes_read = io_start->bytes_read; | |
354 | track->bytes_written = io_start->bytes_written; | |
355 | } | |
356 | } | |
357 | ||
358 | #ifdef __GNUC__ | |
359 | #define _INLINE_ __inline__ | |
360 | #else | |
361 | #define _INLINE_ | |
362 | #endif | |
363 | ||
364 | static _INLINE_ float timeval_subtract(struct timeval *tv1, | |
365 | struct timeval *tv2) | |
366 | { | |
367 | return ((tv1->tv_sec - tv2->tv_sec) + | |
368 | ((float) (tv1->tv_usec - tv2->tv_usec)) / 1000000); | |
369 | } | |
370 | ||
371 | void print_resource_track(e2fsck_t ctx, const char *desc, | |
372 | struct resource_track *track, io_channel channel) | |
373 | { | |
374 | #ifdef HAVE_GETRUSAGE | |
375 | struct rusage r; | |
376 | #endif | |
377 | #ifdef HAVE_MALLINFO | |
378 | struct mallinfo malloc_info; | |
379 | #endif | |
380 | struct timeval time_end; | |
381 | ||
382 | if ((desc && !(ctx->options & E2F_OPT_TIME2)) || | |
383 | (!desc && !(ctx->options & E2F_OPT_TIME))) | |
384 | return; | |
385 | ||
386 | e2fsck_clear_progbar(ctx); | |
387 | gettimeofday(&time_end, 0); | |
388 | ||
389 | if (desc) | |
390 | log_out(ctx, "%s: ", desc); | |
391 | ||
392 | #ifdef HAVE_MALLINFO | |
393 | #define kbytes(x) (((unsigned long)(x) + 1023) / 1024) | |
394 | ||
395 | malloc_info = mallinfo(); | |
396 | log_out(ctx, _("Memory used: %luk/%luk (%luk/%luk), "), | |
397 | kbytes(malloc_info.arena), kbytes(malloc_info.hblkhd), | |
398 | kbytes(malloc_info.uordblks), kbytes(malloc_info.fordblks)); | |
399 | #else | |
400 | log_out(ctx, _("Memory used: %lu, "), | |
401 | (unsigned long) (((char *) sbrk(0)) - | |
402 | ((char *) track->brk_start))); | |
403 | #endif | |
404 | #ifdef HAVE_GETRUSAGE | |
405 | getrusage(RUSAGE_SELF, &r); | |
406 | ||
407 | log_out(ctx, _("time: %5.2f/%5.2f/%5.2f\n"), | |
408 | timeval_subtract(&time_end, &track->time_start), | |
409 | timeval_subtract(&r.ru_utime, &track->user_start), | |
410 | timeval_subtract(&r.ru_stime, &track->system_start)); | |
411 | #else | |
412 | log_out(ctx, _("elapsed time: %6.3f\n"), | |
413 | timeval_subtract(&time_end, &track->time_start)); | |
414 | #endif | |
415 | #define mbytes(x) (((x) + 1048575) / 1048576) | |
416 | if (channel && channel->manager && channel->manager->get_stats) { | |
417 | io_stats delta = 0; | |
418 | unsigned long long bytes_read = 0; | |
419 | unsigned long long bytes_written = 0; | |
420 | ||
421 | if (desc) | |
422 | log_out(ctx, "%s: ", desc); | |
423 | ||
424 | channel->manager->get_stats(channel, &delta); | |
425 | if (delta) { | |
426 | bytes_read = delta->bytes_read - track->bytes_read; | |
427 | bytes_written = delta->bytes_written - | |
428 | track->bytes_written; | |
429 | } | |
430 | log_out(ctx, "I/O read: %lluMB, write: %lluMB, " | |
431 | "rate: %.2fMB/s\n", | |
432 | mbytes(bytes_read), mbytes(bytes_written), | |
433 | (double)mbytes(bytes_read + bytes_written) / | |
434 | timeval_subtract(&time_end, &track->time_start)); | |
435 | } | |
436 | } | |
437 | #endif /* RESOURCE_TRACK */ | |
438 | ||
439 | void e2fsck_read_inode(e2fsck_t ctx, unsigned long ino, | |
440 | struct ext2_inode * inode, const char *proc) | |
441 | { | |
442 | errcode_t retval; | |
443 | ||
444 | retval = ext2fs_read_inode(ctx->fs, ino, inode); | |
445 | if (retval) { | |
446 | com_err("ext2fs_read_inode", retval, | |
447 | _("while reading inode %lu in %s"), ino, proc); | |
448 | fatal_error(ctx, 0); | |
449 | } | |
450 | } | |
451 | ||
452 | void e2fsck_read_inode_full(e2fsck_t ctx, unsigned long ino, | |
453 | struct ext2_inode *inode, int bufsize, | |
454 | const char *proc) | |
455 | { | |
456 | errcode_t retval; | |
457 | ||
458 | retval = ext2fs_read_inode_full(ctx->fs, ino, inode, bufsize); | |
459 | if (retval) { | |
460 | com_err("ext2fs_read_inode_full", retval, | |
461 | _("while reading inode %lu in %s"), ino, proc); | |
462 | fatal_error(ctx, 0); | |
463 | } | |
464 | } | |
465 | ||
466 | void e2fsck_write_inode_full(e2fsck_t ctx, unsigned long ino, | |
467 | struct ext2_inode * inode, int bufsize, | |
468 | const char *proc) | |
469 | { | |
470 | errcode_t retval; | |
471 | ||
472 | retval = ext2fs_write_inode_full(ctx->fs, ino, inode, bufsize); | |
473 | if (retval) { | |
474 | com_err("ext2fs_write_inode", retval, | |
475 | _("while writing inode %lu in %s"), ino, proc); | |
476 | fatal_error(ctx, 0); | |
477 | } | |
478 | } | |
479 | ||
480 | void e2fsck_write_inode(e2fsck_t ctx, unsigned long ino, | |
481 | struct ext2_inode * inode, const char *proc) | |
482 | { | |
483 | errcode_t retval; | |
484 | ||
485 | retval = ext2fs_write_inode(ctx->fs, ino, inode); | |
486 | if (retval) { | |
487 | com_err("ext2fs_write_inode", retval, | |
488 | _("while writing inode %lu in %s"), ino, proc); | |
489 | fatal_error(ctx, 0); | |
490 | } | |
491 | } | |
492 | ||
493 | #ifdef MTRACE | |
494 | void mtrace_print(char *mesg) | |
495 | { | |
496 | FILE *malloc_get_mallstream(); | |
497 | FILE *f = malloc_get_mallstream(); | |
498 | ||
499 | if (f) | |
500 | fprintf(f, "============= %s\n", mesg); | |
501 | } | |
502 | #endif | |
503 | ||
504 | blk64_t get_backup_sb(e2fsck_t ctx, ext2_filsys fs, const char *name, | |
505 | io_manager manager) | |
506 | { | |
507 | struct ext2_super_block *sb; | |
508 | io_channel io = NULL; | |
509 | void *buf = NULL; | |
510 | int blocksize; | |
511 | blk64_t superblock, ret_sb = 8193; | |
512 | ||
513 | if (fs && fs->super) { | |
514 | ret_sb = (fs->super->s_blocks_per_group + | |
515 | fs->super->s_first_data_block); | |
516 | if (ctx) { | |
517 | ctx->superblock = ret_sb; | |
518 | ctx->blocksize = fs->blocksize; | |
519 | } | |
520 | return ret_sb; | |
521 | } | |
522 | ||
523 | if (ctx) { | |
524 | if (ctx->blocksize) { | |
525 | ret_sb = ctx->blocksize * 8; | |
526 | if (ctx->blocksize == 1024) | |
527 | ret_sb++; | |
528 | ctx->superblock = ret_sb; | |
529 | return ret_sb; | |
530 | } | |
531 | ctx->superblock = ret_sb; | |
532 | ctx->blocksize = 1024; | |
533 | } | |
534 | ||
535 | if (!name || !manager) | |
536 | goto cleanup; | |
537 | ||
538 | if (manager->open(name, 0, &io) != 0) | |
539 | goto cleanup; | |
540 | ||
541 | if (ext2fs_get_mem(SUPERBLOCK_SIZE, &buf)) | |
542 | goto cleanup; | |
543 | sb = (struct ext2_super_block *) buf; | |
544 | ||
545 | for (blocksize = EXT2_MIN_BLOCK_SIZE; | |
546 | blocksize <= EXT2_MAX_BLOCK_SIZE ; blocksize *= 2) { | |
547 | superblock = blocksize*8; | |
548 | if (blocksize == 1024) | |
549 | superblock++; | |
550 | io_channel_set_blksize(io, blocksize); | |
551 | if (io_channel_read_blk64(io, superblock, | |
552 | -SUPERBLOCK_SIZE, buf)) | |
553 | continue; | |
554 | #ifdef WORDS_BIGENDIAN | |
555 | if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) | |
556 | ext2fs_swap_super(sb); | |
557 | #endif | |
558 | if ((sb->s_magic == EXT2_SUPER_MAGIC) && | |
559 | (EXT2_BLOCK_SIZE(sb) == blocksize)) { | |
560 | ret_sb = superblock; | |
561 | if (ctx) { | |
562 | ctx->superblock = superblock; | |
563 | ctx->blocksize = blocksize; | |
564 | } | |
565 | break; | |
566 | } | |
567 | } | |
568 | ||
569 | cleanup: | |
570 | if (io) | |
571 | io_channel_close(io); | |
572 | if (buf) | |
573 | ext2fs_free_mem(&buf); | |
574 | return (ret_sb); | |
575 | } | |
576 | ||
577 | /* | |
578 | * Given a mode, return the ext2 file type | |
579 | */ | |
580 | int ext2_file_type(unsigned int mode) | |
581 | { | |
582 | if (LINUX_S_ISREG(mode)) | |
583 | return EXT2_FT_REG_FILE; | |
584 | ||
585 | if (LINUX_S_ISDIR(mode)) | |
586 | return EXT2_FT_DIR; | |
587 | ||
588 | if (LINUX_S_ISCHR(mode)) | |
589 | return EXT2_FT_CHRDEV; | |
590 | ||
591 | if (LINUX_S_ISBLK(mode)) | |
592 | return EXT2_FT_BLKDEV; | |
593 | ||
594 | if (LINUX_S_ISLNK(mode)) | |
595 | return EXT2_FT_SYMLINK; | |
596 | ||
597 | if (LINUX_S_ISFIFO(mode)) | |
598 | return EXT2_FT_FIFO; | |
599 | ||
600 | if (LINUX_S_ISSOCK(mode)) | |
601 | return EXT2_FT_SOCK; | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
606 | #define STRIDE_LENGTH 8 | |
607 | /* | |
608 | * Helper function which zeros out _num_ blocks starting at _blk_. In | |
609 | * case of an error, the details of the error is returned via _ret_blk_ | |
610 | * and _ret_count_ if they are non-NULL pointers. Returns 0 on | |
611 | * success, and an error code on an error. | |
612 | * | |
613 | * As a special case, if the first argument is NULL, then it will | |
614 | * attempt to free the static zeroizing buffer. (This is to keep | |
615 | * programs that check for memory leaks happy.) | |
616 | */ | |
617 | errcode_t e2fsck_zero_blocks(ext2_filsys fs, blk_t blk, int num, | |
618 | blk_t *ret_blk, int *ret_count) | |
619 | { | |
620 | int j, count; | |
621 | static char *buf; | |
622 | errcode_t retval; | |
623 | ||
624 | /* If fs is null, clean up the static buffer and return */ | |
625 | if (!fs) { | |
626 | if (buf) { | |
627 | free(buf); | |
628 | buf = 0; | |
629 | } | |
630 | return 0; | |
631 | } | |
632 | /* Allocate the zeroizing buffer if necessary */ | |
633 | if (!buf) { | |
634 | buf = malloc(fs->blocksize * STRIDE_LENGTH); | |
635 | if (!buf) { | |
636 | com_err("malloc", ENOMEM, "%s", | |
637 | _("while allocating zeroizing buffer")); | |
638 | exit(1); | |
639 | } | |
640 | memset(buf, 0, fs->blocksize * STRIDE_LENGTH); | |
641 | } | |
642 | /* OK, do the write loop */ | |
643 | for (j = 0; j < num; j += STRIDE_LENGTH, blk += STRIDE_LENGTH) { | |
644 | count = num - j; | |
645 | if (count > STRIDE_LENGTH) | |
646 | count = STRIDE_LENGTH; | |
647 | retval = io_channel_write_blk64(fs->io, blk, count, buf); | |
648 | if (retval) { | |
649 | if (ret_count) | |
650 | *ret_count = count; | |
651 | if (ret_blk) | |
652 | *ret_blk = blk; | |
653 | return retval; | |
654 | } | |
655 | } | |
656 | return 0; | |
657 | } | |
658 | ||
659 | /* | |
660 | * Check to see if a filesystem is in /proc/filesystems. | |
661 | * Returns 1 if found, 0 if not | |
662 | */ | |
663 | int fs_proc_check(const char *fs_name) | |
664 | { | |
665 | FILE *f; | |
666 | char buf[80], *cp, *t; | |
667 | ||
668 | f = fopen("/proc/filesystems", "r"); | |
669 | if (!f) | |
670 | return (0); | |
671 | while (!feof(f)) { | |
672 | if (!fgets(buf, sizeof(buf), f)) | |
673 | break; | |
674 | cp = buf; | |
675 | if (!isspace(*cp)) { | |
676 | while (*cp && !isspace(*cp)) | |
677 | cp++; | |
678 | } | |
679 | while (*cp && isspace(*cp)) | |
680 | cp++; | |
681 | if ((t = strchr(cp, '\n')) != NULL) | |
682 | *t = 0; | |
683 | if ((t = strchr(cp, '\t')) != NULL) | |
684 | *t = 0; | |
685 | if ((t = strchr(cp, ' ')) != NULL) | |
686 | *t = 0; | |
687 | if (!strcmp(fs_name, cp)) { | |
688 | fclose(f); | |
689 | return (1); | |
690 | } | |
691 | } | |
692 | fclose(f); | |
693 | return (0); | |
694 | } | |
695 | ||
696 | /* | |
697 | * Check to see if a filesystem is available as a module | |
698 | * Returns 1 if found, 0 if not | |
699 | */ | |
700 | int check_for_modules(const char *fs_name) | |
701 | { | |
702 | #ifdef __linux__ | |
703 | struct utsname uts; | |
704 | FILE *f; | |
705 | char buf[1024], *cp, *t; | |
706 | int i; | |
707 | ||
708 | if (uname(&uts)) | |
709 | return (0); | |
710 | snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release); | |
711 | ||
712 | f = fopen(buf, "r"); | |
713 | if (!f) | |
714 | return (0); | |
715 | while (!feof(f)) { | |
716 | if (!fgets(buf, sizeof(buf), f)) | |
717 | break; | |
718 | if ((cp = strchr(buf, ':')) != NULL) | |
719 | *cp = 0; | |
720 | else | |
721 | continue; | |
722 | if ((cp = strrchr(buf, '/')) != NULL) | |
723 | cp++; | |
724 | else | |
725 | cp = buf; | |
726 | i = strlen(cp); | |
727 | if (i > 3) { | |
728 | t = cp + i - 3; | |
729 | if (!strcmp(t, ".ko")) | |
730 | *t = 0; | |
731 | } | |
732 | if (!strcmp(cp, fs_name)) { | |
733 | fclose(f); | |
734 | return (1); | |
735 | } | |
736 | } | |
737 | fclose(f); | |
738 | #endif /* __linux__ */ | |
739 | return (0); | |
740 | } | |
741 | ||
742 | /* | |
743 | * Helper function that does the right thing if write returns a | |
744 | * partial write, or an EGAIN/EINTR error. | |
745 | */ | |
746 | int write_all(int fd, char *buf, size_t count) | |
747 | { | |
748 | ssize_t ret; | |
749 | int c = 0; | |
750 | ||
751 | while (count > 0) { | |
752 | ret = write(fd, buf, count); | |
753 | if (ret < 0) { | |
754 | if ((errno == EAGAIN) || (errno == EINTR)) | |
755 | continue; | |
756 | return -1; | |
757 | } | |
758 | count -= ret; | |
759 | buf += ret; | |
760 | c += ret; | |
761 | } | |
762 | return c; | |
763 | } | |
764 | ||
765 | void dump_mmp_msg(struct mmp_struct *mmp, const char *msg) | |
766 | { | |
767 | ||
768 | if (msg) | |
769 | printf("MMP check failed: %s\n", msg); | |
770 | if (mmp) { | |
771 | time_t t = mmp->mmp_time; | |
772 | ||
773 | printf("MMP error info: last update: %s node: %s device: %s\n", | |
774 | ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname); | |
775 | } | |
776 | } | |
777 | ||
778 | errcode_t e2fsck_mmp_update(ext2_filsys fs) | |
779 | { | |
780 | errcode_t retval; | |
781 | ||
782 | retval = ext2fs_mmp_update(fs); | |
783 | if (retval == EXT2_ET_MMP_CHANGE_ABORT) | |
784 | dump_mmp_msg(fs->mmp_cmp, | |
785 | _("UNEXPECTED INCONSISTENCY: the filesystem is " | |
786 | "being modified while fsck is running.\n")); | |
787 | ||
788 | return retval; | |
789 | } | |
790 | ||
791 | void e2fsck_set_bitmap_type(ext2_filsys fs, unsigned int default_type, | |
792 | const char *profile_name, unsigned int *old_type) | |
793 | { | |
794 | unsigned type; | |
795 | e2fsck_t ctx = (e2fsck_t) fs->priv_data; | |
796 | ||
797 | if (old_type) | |
798 | *old_type = fs->default_bitmap_type; | |
799 | profile_get_uint(ctx->profile, "bitmaps", profile_name, 0, | |
800 | default_type, &type); | |
801 | profile_get_uint(ctx->profile, "bitmaps", "all", 0, type, &type); | |
802 | fs->default_bitmap_type = type ? type : default_type; | |
803 | } | |
804 | ||
805 | errcode_t e2fsck_allocate_inode_bitmap(ext2_filsys fs, const char *descr, | |
806 | int deftype, | |
807 | const char *name, | |
808 | ext2fs_inode_bitmap *ret) | |
809 | { | |
810 | errcode_t retval; | |
811 | unsigned int save_type; | |
812 | ||
813 | e2fsck_set_bitmap_type(fs, deftype, name, &save_type); | |
814 | retval = ext2fs_allocate_inode_bitmap(fs, descr, ret); | |
815 | fs->default_bitmap_type = save_type; | |
816 | return retval; | |
817 | } | |
818 | ||
819 | errcode_t e2fsck_allocate_block_bitmap(ext2_filsys fs, const char *descr, | |
820 | int deftype, | |
821 | const char *name, | |
822 | ext2fs_block_bitmap *ret) | |
823 | { | |
824 | errcode_t retval; | |
825 | unsigned int save_type; | |
826 | ||
827 | e2fsck_set_bitmap_type(fs, deftype, name, &save_type); | |
828 | retval = ext2fs_allocate_block_bitmap(fs, descr, ret); | |
829 | fs->default_bitmap_type = save_type; | |
830 | return retval; | |
831 | } | |
832 | ||
833 | errcode_t e2fsck_allocate_subcluster_bitmap(ext2_filsys fs, const char *descr, | |
834 | int deftype, | |
835 | const char *name, | |
836 | ext2fs_block_bitmap *ret) | |
837 | { | |
838 | errcode_t retval; | |
839 | unsigned int save_type; | |
840 | ||
841 | e2fsck_set_bitmap_type(fs, deftype, name, &save_type); | |
842 | retval = ext2fs_allocate_subcluster_bitmap(fs, descr, ret); | |
843 | fs->default_bitmap_type = save_type; | |
844 | return retval; | |
845 | } |