e2fsck/util.c

   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         if (ctx->logf)
  83                 fprintf(ctx->logf, "Exit status: %d\n", exit_value);
  84         exit(exit_value);
  85 }
  86
  87 void log_out(e2fsck_t ctx, const char *fmt, ...)
  88 {
  89         va_list pvar;
  90
  91         va_start(pvar, fmt);
  92         vprintf(fmt, pvar);
  93         va_end(pvar);
  94         if (ctx->logf) {
  95                 va_start(pvar, fmt);
  96                 vfprintf(ctx->logf, fmt, pvar);
  97                 va_end(pvar);
  98         }
  99 }
 100
 101 void log_err(e2fsck_t ctx, const char *fmt, ...)
 102 {
 103         va_list pvar;
 104
 105         va_start(pvar, fmt);
 106         vfprintf(stderr, fmt, pvar);
 107         va_end(pvar);
 108         if (ctx->logf) {
 109                 va_start(pvar, fmt);
 110                 vfprintf(ctx->logf, fmt, pvar);
 111                 va_end(pvar);
 112         }
 113 }
 114
 115 void *e2fsck_allocate_memory(e2fsck_t ctx, unsigned long size,
 116                              const char *description)
 117 {
 118         void *ret;
 119         char buf[256];
 120
 121 #ifdef DEBUG_ALLOCATE_MEMORY
 122         printf("Allocating %lu bytes for %s...\n", size, description);
 123 #endif
 124         if (ext2fs_get_memzero(size, &ret)) {
 125                 sprintf(buf, "Can't allocate %lu bytes for %s\n",
 126                         size, description);
 127                 fatal_error(ctx, buf);
 128         }
 129
 130         return ret;
 131 }
 132
 133 char *string_copy(e2fsck_t ctx EXT2FS_ATTR((unused)),
 134                   const char *str, size_t len)
 135 {
 136         char    *ret;
 137
 138         if (!str)
 139                 return NULL;
 140         if (!len)
 141                 len = strlen(str);
 142         ret = malloc(len+1);
 143         if (ret) {
 144                 strncpy(ret, str, len);
 145                 ret[len] = 0;
 146         }
 147         return ret;
 148 }
 149
 150 #ifndef HAVE_STRNLEN
 151 /*
 152  * Incredibly, libc5 doesn't appear to have strnlen.  So we have to
 153  * provide our own.
 154  */
 155 int e2fsck_strnlen(const char * s, int count)
 156 {
 157         const char *cp = s;
 158
 159         while (count-- && *cp)
 160                 cp++;
 161         return cp - s;
 162 }
 163 #endif
 164
 165 #ifndef HAVE_CONIO_H
 166 static int read_a_char(void)
 167 {
 168         char    c;
 169         int     r;
 170         int     fail = 0;
 171
 172         while(1) {
 173                 if (e2fsck_global_ctx &&
 174                     (e2fsck_global_ctx->flags & E2F_FLAG_CANCEL)) {
 175                         return 3;
 176                 }
 177                 r = read(0, &c, 1);
 178                 if (r == 1)
 179                         return c;
 180                 if (fail++ > 100)
 181                         break;
 182         }
 183         return EOF;
 184 }
 185 #endif
 186
 187 int ask_yn(e2fsck_t ctx, const char * string, int def)
 188 {
 189         int             c;
 190         const char      *defstr;
 191         const char      *short_yes = _("yY");
 192         const char      *short_no = _("nN");
 193         const char      *short_yesall = _("aA");
 194         const char      *english_yes = "yY";
 195         const char      *english_no = "nN";
 196         const char      *english_yesall = "aA";
 197         const char      *yesall_prompt = _(" ('a' enables 'yes' to all) ");
 198         const char      *extra_prompt = "";
 199         static int      yes_answers;
 200
 201 #ifdef HAVE_TERMIOS_H
 202         struct termios  termios, tmp;
 203
 204         if (tcgetattr (0, &termios) < 0)
 205                 memset(&termios, 0, sizeof(termios));
 206         tmp = termios;
 207         tmp.c_lflag &= ~(ICANON | ECHO);
 208         tmp.c_cc[VMIN] = 1;
 209         tmp.c_cc[VTIME] = 0;
 210         tcsetattr (0, TCSANOW, &tmp);
 211 #endif
 212
 213         if (def == 1)
 214                 defstr = _(_("<y>"));
 215         else if (def == 0)
 216                 defstr = _(_("<n>"));
 217         else
 218                 defstr = _(" (y/n)");
 219         /*
 220          * If the user presses 'y' more than 8 (but less than 12) times in
 221          * succession without pressing anything else, display a hint about
 222          * yes-to-all mode.
 223          */
 224         if (yes_answers > 12)
 225                 yes_answers = -1;
 226         else if (yes_answers > 8)
 227                 extra_prompt = yesall_prompt;
 228         log_out(ctx, "%s%s%s? ", string, extra_prompt, defstr);
 229         while (1) {
 230                 fflush (stdout);
 231                 if ((c = read_a_char()) == EOF)
 232                         break;
 233                 if (c == 3) {
 234 #ifdef HAVE_TERMIOS_H
 235                         tcsetattr (0, TCSANOW, &termios);
 236 #endif
 237                         if (ctx->flags & E2F_FLAG_SETJMP_OK) {
 238                                 log_out(ctx, "\n");
 239                                 longjmp(e2fsck_global_ctx->abort_loc, 1);
 240                         }
 241                         log_out(ctx, "%s", _("cancelled!\n"));
 242                         yes_answers = 0;
 243                         return 0;
 244                 }
 245                 if (strchr(short_yes, (char) c)) {
 246                 do_yes:
 247                         def = 1;
 248                         if (yes_answers >= 0)
 249                                 yes_answers++;
 250                         break;
 251                 } else if (strchr(short_no, (char) c)) {
 252                 do_no:
 253                         def = 0;
 254                         yes_answers = -1;
 255                         break;
 256                 } else if (strchr(short_yesall, (char)c)) {
 257                 do_all:
 258                         def = 2;
 259                         yes_answers = -1;
 260                         ctx->options |= E2F_OPT_YES;
 261                         break;
 262                 } else if (strchr(english_yes, (char) c)) {
 263                         goto do_yes;
 264                 } else if (strchr(english_no, (char) c)) {
 265                         goto do_no;
 266                 } else if (strchr(english_yesall, (char) c)) {
 267                         goto do_all;
 268                 } else if ((c == 27 || c == ' ' || c == '\n') && (def != -1)) {
 269                         yes_answers = -1;
 270                         break;
 271                 }
 272         }
 273         if (def == 2)
 274                 log_out(ctx, "%s", _("yes to all\n"));
 275         else if (def)
 276                 log_out(ctx, "%s", _("yes\n"));
 277         else
 278                 log_out(ctx, "%s", _("no\n"));
 279 #ifdef HAVE_TERMIOS_H
 280         tcsetattr (0, TCSANOW, &termios);
 281 #endif
 282         return def;
 283 }
 284
 285 int ask (e2fsck_t ctx, const char * string, int def)
 286 {
 287         if (ctx->options & E2F_OPT_NO) {
 288                 log_out(ctx, _("%s? no\n\n"), string);
 289                 return 0;
 290         }
 291         if (ctx->options & E2F_OPT_YES) {
 292                 log_out(ctx, _("%s? yes\n\n"), string);
 293                 return 1;
 294         }
 295         if (ctx->options & E2F_OPT_PREEN) {
 296                 log_out(ctx, "%s? %s\n\n", string, def ? _("yes") : _("no"));
 297                 return def;
 298         }
 299         return ask_yn(ctx, string, def);
 300 }
 301
 302 void e2fsck_read_bitmaps(e2fsck_t ctx)
 303 {
 304         ext2_filsys fs = ctx->fs;
 305         errcode_t       retval;
 306         const char      *old_op;
 307         unsigned int    save_type;
 308         int             flags;
 309
 310         if (ctx->invalid_bitmaps) {
 311                 com_err(ctx->program_name, 0,
 312                     _("e2fsck_read_bitmaps: illegal bitmap block(s) for %s"),
 313                         ctx->device_name);
 314                 fatal_error(ctx, 0);
 315         }
 316
 317         old_op = ehandler_operation(_("reading inode and block bitmaps"));
 318         e2fsck_set_bitmap_type(fs, EXT2FS_BMAP64_RBTREE, "fs_bitmaps",
 319                                &save_type);
 320         flags = ctx->fs->flags;
 321         ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
 322         retval = ext2fs_read_bitmaps(fs);
 323         ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) |
 324                          (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS);
 325         fs->default_bitmap_type = save_type;
 326         ehandler_operation(old_op);
 327         if (retval) {
 328                 com_err(ctx->program_name, retval,
 329                         _("while retrying to read bitmaps for %s"),
 330                         ctx->device_name);
 331                 fatal_error(ctx, 0);
 332         }
 333 }
 334
 335 void e2fsck_write_bitmaps(e2fsck_t ctx)
 336 {
 337         ext2_filsys fs = ctx->fs;
 338         errcode_t       retval;
 339         const char      *old_op;
 340
 341         old_op = ehandler_operation(_("writing block and inode bitmaps"));
 342         retval = ext2fs_write_bitmaps(fs);
 343         ehandler_operation(old_op);
 344         if (retval) {
 345                 com_err(ctx->program_name, retval,
 346                         _("while rewriting block and inode bitmaps for %s"),
 347                         ctx->device_name);
 348                 fatal_error(ctx, 0);
 349         }
 350 }
 351
 352 void preenhalt(e2fsck_t ctx)
 353 {
 354         ext2_filsys fs = ctx->fs;
 355
 356         if (!(ctx->options & E2F_OPT_PREEN))
 357                 return;
 358         log_err(ctx, _("\n\n%s: UNEXPECTED INCONSISTENCY; "
 359                 "RUN fsck MANUALLY.\n\t(i.e., without -a or -p options)\n"),
 360                ctx->device_name);
 361         ctx->flags |= E2F_FLAG_EXITING;
 362         if (fs != NULL) {
 363                 fs->super->s_state |= EXT2_ERROR_FS;
 364                 ext2fs_mark_super_dirty(fs);
 365                 ext2fs_close_free(&fs);
 366         }
 367         exit(FSCK_UNCORRECTED);
 368 }
 369
 370 #ifdef RESOURCE_TRACK
 371 void init_resource_track(struct resource_track *track, io_channel channel)
 372 {
 373 #ifdef HAVE_GETRUSAGE
 374         struct rusage r;
 375 #endif
 376         io_stats io_start = 0;
 377
 378         track->brk_start = sbrk(0);
 379         gettimeofday(&track->time_start, 0);
 380 #ifdef HAVE_GETRUSAGE
 381 #ifdef sun
 382         memset(&r, 0, sizeof(struct rusage));
 383 #endif
 384         getrusage(RUSAGE_SELF, &r);
 385         track->user_start = r.ru_utime;
 386         track->system_start = r.ru_stime;
 387 #else
 388         track->user_start.tv_sec = track->user_start.tv_usec = 0;
 389         track->system_start.tv_sec = track->system_start.tv_usec = 0;
 390 #endif
 391         track->bytes_read = 0;
 392         track->bytes_written = 0;
 393         if (channel && channel->manager && channel->manager->get_stats)
 394                 channel->manager->get_stats(channel, &io_start);
 395         if (io_start) {
 396                 track->bytes_read = io_start->bytes_read;
 397                 track->bytes_written = io_start->bytes_written;
 398         }
 399 }
 400
 401 #ifdef __GNUC__
 402 #define _INLINE_ __inline__
 403 #else
 404 #define _INLINE_
 405 #endif
 406
 407 static _INLINE_ float timeval_subtract(struct timeval *tv1,
 408                                        struct timeval *tv2)
 409 {
 410         return ((tv1->tv_sec - tv2->tv_sec) +
 411                 ((float) (tv1->tv_usec - tv2->tv_usec)) / 1000000);
 412 }
 413
 414 void print_resource_track(e2fsck_t ctx, const char *desc,
 415                           struct resource_track *track, io_channel channel)
 416 {
 417 #ifdef HAVE_GETRUSAGE
 418         struct rusage r;
 419 #endif
 420         struct timeval time_end;
 421
 422         if ((desc && !(ctx->options & E2F_OPT_TIME2)) ||
 423             (!desc && !(ctx->options & E2F_OPT_TIME)))
 424                 return;
 425
 426         e2fsck_clear_progbar(ctx);
 427         gettimeofday(&time_end, 0);
 428
 429         if (desc)
 430                 log_out(ctx, "%s: ", desc);
 431
 432 #define kbytes(x)       (((unsigned long long)(x) + 1023) / 1024)
 433 #ifdef HAVE_MALLINFO
 434         /* don't use mallinfo() if over 2GB used, since it returns "int" */
 435         if ((char *)sbrk(0) - (char *)track->brk_start < 2LL << 30) {
 436                 struct mallinfo malloc_info = mallinfo();
 437
 438                 log_out(ctx, _("Memory used: %lluk/%lluk (%lluk/%lluk), "),
 439                         kbytes(malloc_info.arena), kbytes(malloc_info.hblkhd),
 440                         kbytes(malloc_info.uordblks),
 441                         kbytes(malloc_info.fordblks));
 442         } else
 443 #endif
 444         log_out(ctx, _("Memory used: %lluk, "),
 445                 kbytes(((char *)sbrk(0)) - ((char *)track->brk_start)));
 446
 447 #ifdef HAVE_GETRUSAGE
 448         getrusage(RUSAGE_SELF, &r);
 449
 450         log_out(ctx, _("time: %5.2f/%5.2f/%5.2f\n"),
 451                 timeval_subtract(&time_end, &track->time_start),
 452                 timeval_subtract(&r.ru_utime, &track->user_start),
 453                 timeval_subtract(&r.ru_stime, &track->system_start));
 454 #else
 455         log_out(ctx, _("elapsed time: %6.3f\n"),
 456                 timeval_subtract(&time_end, &track->time_start));
 457 #endif
 458 #define mbytes(x)       (((x) + 1048575) / 1048576)
 459         if (channel && channel->manager && channel->manager->get_stats) {
 460                 io_stats delta = 0;
 461                 unsigned long long bytes_read = 0;
 462                 unsigned long long bytes_written = 0;
 463
 464                 if (desc)
 465                         log_out(ctx, "%s: ", desc);
 466
 467                 channel->manager->get_stats(channel, &delta);
 468                 if (delta) {
 469                         bytes_read = delta->bytes_read - track->bytes_read;
 470                         bytes_written = delta->bytes_written -
 471                                 track->bytes_written;
 472                 }
 473                 log_out(ctx, "I/O read: %lluMB, write: %lluMB, "
 474                         "rate: %.2fMB/s\n",
 475                         mbytes(bytes_read), mbytes(bytes_written),
 476                         (double)mbytes(bytes_read + bytes_written) /
 477                         timeval_subtract(&time_end, &track->time_start));
 478         }
 479 }
 480 #endif /* RESOURCE_TRACK */
 481
 482 void e2fsck_read_inode(e2fsck_t ctx, unsigned long ino,
 483                               struct ext2_inode * inode, const char *proc)
 484 {
 485         errcode_t retval;
 486
 487         retval = ext2fs_read_inode(ctx->fs, ino, inode);
 488         if (retval) {
 489                 com_err("ext2fs_read_inode", retval,
 490                         _("while reading inode %lu in %s"), ino, proc);
 491                 fatal_error(ctx, 0);
 492         }
 493 }
 494
 495 void e2fsck_read_inode_full(e2fsck_t ctx, unsigned long ino,
 496                             struct ext2_inode *inode, int bufsize,
 497                             const char *proc)
 498 {
 499         errcode_t retval;
 500
 501         retval = ext2fs_read_inode_full(ctx->fs, ino, inode, bufsize);
 502         if (retval) {
 503                 com_err("ext2fs_read_inode_full", retval,
 504                         _("while reading inode %lu in %s"), ino, proc);
 505                 fatal_error(ctx, 0);
 506         }
 507 }
 508
 509 void e2fsck_write_inode_full(e2fsck_t ctx, unsigned long ino,
 510                              struct ext2_inode * inode, int bufsize,
 511                              const char *proc)
 512 {
 513         errcode_t retval;
 514
 515         retval = ext2fs_write_inode_full(ctx->fs, ino, inode, bufsize);
 516         if (retval) {
 517                 com_err("ext2fs_write_inode", retval,
 518                         _("while writing inode %lu in %s"), ino, proc);
 519                 fatal_error(ctx, 0);
 520         }
 521 }
 522
 523 void e2fsck_write_inode(e2fsck_t ctx, unsigned long ino,
 524                         struct ext2_inode * inode, const char *proc)
 525 {
 526         errcode_t retval;
 527
 528         retval = ext2fs_write_inode(ctx->fs, ino, inode);
 529         if (retval) {
 530                 com_err("ext2fs_write_inode", retval,
 531                         _("while writing inode %lu in %s"), ino, proc);
 532                 fatal_error(ctx, 0);
 533         }
 534 }
 535
 536 #ifdef MTRACE
 537 void mtrace_print(char *mesg)
 538 {
 539         FILE    *malloc_get_mallstream();
 540         FILE    *f = malloc_get_mallstream();
 541
 542         if (f)
 543                 fprintf(f, "============= %s\n", mesg);
 544 }
 545 #endif
 546
 547 blk64_t get_backup_sb(e2fsck_t ctx, ext2_filsys fs, const char *name,
 548                       io_manager manager)
 549 {
 550         struct ext2_super_block *sb;
 551         io_channel              io = NULL;
 552         void                    *buf = NULL;
 553         int                     blocksize;
 554         blk64_t                 superblock, ret_sb = 8193;
 555
 556         if (fs && fs->super) {
 557                 ret_sb = (fs->super->s_blocks_per_group +
 558                           fs->super->s_first_data_block);
 559                 if (ctx) {
 560                         ctx->superblock = ret_sb;
 561                         ctx->blocksize = fs->blocksize;
 562                 }
 563                 return ret_sb;
 564         }
 565
 566         if (ctx) {
 567                 if (ctx->blocksize) {
 568                         ret_sb = ctx->blocksize * 8;
 569                         if (ctx->blocksize == 1024)
 570                                 ret_sb++;
 571                         ctx->superblock = ret_sb;
 572                         return ret_sb;
 573                 }
 574                 ctx->superblock = ret_sb;
 575                 ctx->blocksize = 1024;
 576         }
 577
 578         if (!name || !manager)
 579                 goto cleanup;
 580
 581         if (manager->open(name, 0, &io) != 0)
 582                 goto cleanup;
 583
 584         if (ext2fs_get_mem(SUPERBLOCK_SIZE, &buf))
 585                 goto cleanup;
 586         sb = (struct ext2_super_block *) buf;
 587
 588         for (blocksize = EXT2_MIN_BLOCK_SIZE;
 589              blocksize <= EXT2_MAX_BLOCK_SIZE ; blocksize *= 2) {
 590                 superblock = blocksize*8;
 591                 if (blocksize == 1024)
 592                         superblock++;
 593                 io_channel_set_blksize(io, blocksize);
 594                 if (io_channel_read_blk64(io, superblock,
 595                                         -SUPERBLOCK_SIZE, buf))
 596                         continue;
 597 #ifdef WORDS_BIGENDIAN
 598                 if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 599                         ext2fs_swap_super(sb);
 600 #endif
 601                 if ((sb->s_magic == EXT2_SUPER_MAGIC) &&
 602                     (EXT2_BLOCK_SIZE(sb) == blocksize)) {
 603                         ret_sb = superblock;
 604                         if (ctx) {
 605                                 ctx->superblock = superblock;
 606                                 ctx->blocksize = blocksize;
 607                         }
 608                         break;
 609                 }
 610         }
 611
 612 cleanup:
 613         if (io)
 614                 io_channel_close(io);
 615         if (buf)
 616                 ext2fs_free_mem(&buf);
 617         return (ret_sb);
 618 }
 619
 620 /*
 621  * Given a mode, return the ext2 file type
 622  */
 623 int ext2_file_type(unsigned int mode)
 624 {
 625         if (LINUX_S_ISREG(mode))
 626                 return EXT2_FT_REG_FILE;
 627
 628         if (LINUX_S_ISDIR(mode))
 629                 return EXT2_FT_DIR;
 630
 631         if (LINUX_S_ISCHR(mode))
 632                 return EXT2_FT_CHRDEV;
 633
 634         if (LINUX_S_ISBLK(mode))
 635                 return EXT2_FT_BLKDEV;
 636
 637         if (LINUX_S_ISLNK(mode))
 638                 return EXT2_FT_SYMLINK;
 639
 640         if (LINUX_S_ISFIFO(mode))
 641                 return EXT2_FT_FIFO;
 642
 643         if (LINUX_S_ISSOCK(mode))
 644                 return EXT2_FT_SOCK;
 645
 646         return 0;
 647 }
 648
 649 /*
 650  * Check to see if a filesystem is in /proc/filesystems.
 651  * Returns 1 if found, 0 if not
 652  */
 653 int fs_proc_check(const char *fs_name)
 654 {
 655         FILE    *f;
 656         char    buf[80], *cp, *t;
 657
 658         f = fopen("/proc/filesystems", "r");
 659         if (!f)
 660                 return (0);
 661         while (!feof(f)) {
 662                 if (!fgets(buf, sizeof(buf), f))
 663                         break;
 664                 cp = buf;
 665                 if (!isspace(*cp)) {
 666                         while (*cp && !isspace(*cp))
 667                                 cp++;
 668                 }
 669                 while (*cp && isspace(*cp))
 670                         cp++;
 671                 if ((t = strchr(cp, '\n')) != NULL)
 672                         *t = 0;
 673                 if ((t = strchr(cp, '\t')) != NULL)
 674                         *t = 0;
 675                 if ((t = strchr(cp, ' ')) != NULL)
 676                         *t = 0;
 677                 if (!strcmp(fs_name, cp)) {
 678                         fclose(f);
 679                         return (1);
 680                 }
 681         }
 682         fclose(f);
 683         return (0);
 684 }
 685
 686 /*
 687  * Check to see if a filesystem is available as a module
 688  * Returns 1 if found, 0 if not
 689  */
 690 int check_for_modules(const char *fs_name)
 691 {
 692 #ifdef __linux__
 693         struct utsname  uts;
 694         FILE            *f;
 695         char            buf[1024], *cp, *t;
 696         int             i;
 697
 698         if (uname(&uts))
 699                 return (0);
 700         snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
 701
 702         f = fopen(buf, "r");
 703         if (!f)
 704                 return (0);
 705         while (!feof(f)) {
 706                 if (!fgets(buf, sizeof(buf), f))
 707                         break;
 708                 if ((cp = strchr(buf, ':')) != NULL)
 709                         *cp = 0;
 710                 else
 711                         continue;
 712                 if ((cp = strrchr(buf, '/')) != NULL)
 713                         cp++;
 714                 else
 715                         cp = buf;
 716                 i = strlen(cp);
 717                 if (i > 3) {
 718                         t = cp + i - 3;
 719                         if (!strcmp(t, ".ko"))
 720                                 *t = 0;
 721                 }
 722                 if (!strcmp(cp, fs_name)) {
 723                         fclose(f);
 724                         return (1);
 725                 }
 726         }
 727         fclose(f);
 728 #endif /* __linux__ */
 729         return (0);
 730 }
 731
 732 /*
 733  * Helper function that does the right thing if write returns a
 734  * partial write, or an EAGAIN/EINTR error.
 735  */
 736 int write_all(int fd, char *buf, size_t count)
 737 {
 738         ssize_t ret;
 739         int c = 0;
 740
 741         while (count > 0) {
 742                 ret = write(fd, buf, count);
 743                 if (ret < 0) {
 744                         if ((errno == EAGAIN) || (errno == EINTR))
 745                                 continue;
 746                         return -1;
 747                 }
 748                 count -= ret;
 749                 buf += ret;
 750                 c += ret;
 751         }
 752         return c;
 753 }
 754
 755 void dump_mmp_msg(struct mmp_struct *mmp, const char *fmt, ...)
 756 {
 757         va_list pvar;
 758
 759         if (fmt) {
 760                 printf("MMP check failed: ");
 761                 va_start(pvar, fmt);
 762                 vprintf(fmt, pvar);
 763                 va_end(pvar);
 764         }
 765         if (mmp) {
 766                 time_t t = mmp->mmp_time;
 767
 768                 printf("MMP_block:\n");
 769                 printf("    mmp_magic: 0x%x\n", mmp->mmp_magic);
 770                 printf("    mmp_check_interval: %d\n",
 771                        mmp->mmp_check_interval);
 772                 printf("    mmp_sequence: %08x\n", mmp->mmp_seq);
 773                 printf("    mmp_update_date: %s", ctime(&t));
 774                 printf("    mmp_update_time: %lld\n",
 775                        (long long) mmp->mmp_time);
 776                 printf("    mmp_node_name: %.*s\n",
 777                        EXT2_LEN_STR(mmp->mmp_nodename));
 778                 printf("    mmp_device_name: %.*s\n",
 779                        EXT2_LEN_STR(mmp->mmp_bdevname));
 780         }
 781 }
 782
 783 errcode_t e2fsck_mmp_update(ext2_filsys fs)
 784 {
 785         errcode_t retval;
 786
 787         retval = ext2fs_mmp_update(fs);
 788         if (retval == EXT2_ET_MMP_CHANGE_ABORT)
 789                 dump_mmp_msg(fs->mmp_cmp,
 790                              _("UNEXPECTED INCONSISTENCY: the filesystem is "
 791                                "being modified while fsck is running.\n"));
 792
 793         return retval;
 794 }
 795
 796 void e2fsck_set_bitmap_type(ext2_filsys fs, unsigned int default_type,
 797                             const char *profile_name, unsigned int *old_type)
 798 {
 799         unsigned type;
 800         e2fsck_t ctx = (e2fsck_t) fs->priv_data;
 801
 802         if (old_type)
 803                 *old_type = fs->default_bitmap_type;
 804         profile_get_uint(ctx->profile, "bitmaps", profile_name, 0,
 805                          default_type, &type);
 806         profile_get_uint(ctx->profile, "bitmaps", "all", 0, type, &type);
 807         fs->default_bitmap_type = type ? type : default_type;
 808 }
 809
 810 errcode_t e2fsck_allocate_inode_bitmap(ext2_filsys fs, const char *descr,
 811                                        int deftype,
 812                                        const char *name,
 813                                        ext2fs_inode_bitmap *ret)
 814 {
 815         errcode_t       retval;
 816         unsigned int    save_type;
 817
 818         e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
 819         retval = ext2fs_allocate_inode_bitmap(fs, descr, ret);
 820         fs->default_bitmap_type = save_type;
 821         return retval;
 822 }
 823
 824 errcode_t e2fsck_allocate_block_bitmap(ext2_filsys fs, const char *descr,
 825                                        int deftype,
 826                                        const char *name,
 827                                        ext2fs_block_bitmap *ret)
 828 {
 829         errcode_t       retval;
 830         unsigned int    save_type;
 831
 832         e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
 833         retval = ext2fs_allocate_block_bitmap(fs, descr, ret);
 834         fs->default_bitmap_type = save_type;
 835         return retval;
 836 }
 837
 838 errcode_t e2fsck_allocate_subcluster_bitmap(ext2_filsys fs, const char *descr,
 839                                             int deftype,
 840                                             const char *name,
 841                                             ext2fs_block_bitmap *ret)
 842 {
 843         errcode_t       retval;
 844         unsigned int    save_type;
 845
 846         e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
 847         retval = ext2fs_allocate_subcluster_bitmap(fs, descr, ret);
 848         fs->default_bitmap_type = save_type;
 849         return retval;
 850 }
 851
 852 /* Return memory size in bytes */
 853 unsigned long long get_memory_size(void)
 854 {
 855 #if defined(_SC_PHYS_PAGES)
 856 # if defined(_SC_PAGESIZE)
 857         return (unsigned long long)sysconf(_SC_PHYS_PAGES) *
 858                (unsigned long long)sysconf(_SC_PAGESIZE);
 859 # elif defined(_SC_PAGE_SIZE)
 860         return (unsigned long long)sysconf(_SC_PHYS_PAGES) *
 861                (unsigned long long)sysconf(_SC_PAGE_SIZE);
 862 # endif
 863 #elif defined(CTL_HW)
 864 # if (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
 865 #  define CTL_HW_INT64
 866 # elif (defined(HW_PHYSMEM) || defined(HW_REALMEM))
 867 #  define CTL_HW_UINT
 868 # endif
 869         int mib[2];
 870
 871         mib[0] = CTL_HW;
 872 # if defined(HW_MEMSIZE)
 873         mib[1] = HW_MEMSIZE;
 874 # elif defined(HW_PHYSMEM64)
 875         mib[1] = HW_PHYSMEM64;
 876 # elif defined(HW_REALMEM)
 877         mib[1] = HW_REALMEM;
 878 # elif defined(HW_PYSMEM)
 879         mib[1] = HW_PHYSMEM;
 880 # endif
 881 # if defined(CTL_HW_INT64)
 882         unsigned long long size = 0;
 883 # elif defined(CTL_HW_UINT)
 884         unsigned int size = 0;
 885 # endif
 886         return 0;
 887 #else
 888 # warning "Don't know how to detect memory on your platform?"
 889         return 0;
 890 #endif
 891 }