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 #ifdef HAVE_SYS_SYSCTL_H
  41 #include <sys/sysctl.h>
  42 #endif
  43
  44 #include "e2fsck.h"
  45
  46 extern e2fsck_t e2fsck_global_ctx;   /* Try your very best not to use this! */
  47
  48 #include <stdarg.h>
  49 #include <time.h>
  50 #include <sys/time.h>
  51 #include <sys/resource.h>
  52
  53 void fatal_error(e2fsck_t ctx, const char *msg)
  54 {
  55         ext2_filsys fs = ctx->fs;
  56         int exit_value = FSCK_ERROR;
  57
  58         if (msg)
  59                 fprintf (stderr, "e2fsck: %s\n", msg);
  60         if (!fs)
  61                 goto out;
  62         if (fs->io && fs->super) {
  63                 ext2fs_mmp_stop(ctx->fs);
  64                 if (ctx->fs->io->magic == EXT2_ET_MAGIC_IO_CHANNEL)
  65                         io_channel_flush(ctx->fs->io);
  66                 else
  67                         log_err(ctx, "e2fsck: io manager magic bad!\n");
  68         }
  69         if (ext2fs_test_changed(fs)) {
  70                 exit_value |= FSCK_NONDESTRUCT;
  71                 log_out(ctx, _("\n%s: ***** FILE SYSTEM WAS MODIFIED *****\n"),
  72                         ctx->device_name);
  73                 if (ctx->mount_flags & EXT2_MF_ISROOT)
  74                         exit_value |= FSCK_REBOOT;
  75         }
  76         if (!ext2fs_test_valid(fs)) {
  77                 log_out(ctx, _("\n%s: ********** WARNING: Filesystem still has "
  78                                "errors **********\n\n"), ctx->device_name);
  79                 exit_value |= FSCK_UNCORRECTED;
  80                 exit_value &= ~FSCK_NONDESTRUCT;
  81         }
  82 out:
  83         ctx->flags |= E2F_FLAG_ABORT;
  84         if (ctx->flags & E2F_FLAG_SETJMP_OK)
  85                 longjmp(ctx->abort_loc, 1);
  86         exit(exit_value);
  87 }
  88
  89 void log_out(e2fsck_t ctx, const char *fmt, ...)
  90 {
  91         va_list pvar;
  92
  93         va_start(pvar, fmt);
  94         vprintf(fmt, pvar);
  95         va_end(pvar);
  96         if (ctx->logf) {
  97                 va_start(pvar, fmt);
  98                 vfprintf(ctx->logf, fmt, pvar);
  99                 va_end(pvar);
 100         }
 101 }
 102
 103 void log_err(e2fsck_t ctx, const char *fmt, ...)
 104 {
 105         va_list pvar;
 106
 107         va_start(pvar, fmt);
 108         vfprintf(stderr, fmt, pvar);
 109         va_end(pvar);
 110         if (ctx->logf) {
 111                 va_start(pvar, fmt);
 112                 vfprintf(ctx->logf, fmt, pvar);
 113                 va_end(pvar);
 114         }
 115 }
 116
 117 void *e2fsck_allocate_memory(e2fsck_t ctx, unsigned int size,
 118                              const char *description)
 119 {
 120         void *ret;
 121         char buf[256];
 122
 123 #ifdef DEBUG_ALLOCATE_MEMORY
 124         printf("Allocating %u bytes for %s...\n", size, description);
 125 #endif
 126         ret = malloc(size);
 127         if (!ret) {
 128                 sprintf(buf, "Can't allocate %u bytes for %s\n",
 129                         size, description);
 130                 fatal_error(ctx, buf);
 131         }
 132         memset(ret, 0, size);
 133         return ret;
 134 }
 135
 136 char *string_copy(e2fsck_t ctx EXT2FS_ATTR((unused)),
 137                   const char *str, int len)
 138 {
 139         char    *ret;
 140
 141         if (!str)
 142                 return NULL;
 143         if (!len)
 144                 len = strlen(str);
 145         ret = malloc(len+1);
 146         if (ret) {
 147                 strncpy(ret, str, len);
 148                 ret[len] = 0;
 149         }
 150         return ret;
 151 }
 152
 153 #ifndef HAVE_STRNLEN
 154 /*
 155  * Incredibly, libc5 doesn't appear to have strnlen.  So we have to
 156  * provide our own.
 157  */
 158 int e2fsck_strnlen(const char * s, int count)
 159 {
 160         const char *cp = s;
 161
 162         while (count-- && *cp)
 163                 cp++;
 164         return cp - s;
 165 }
 166 #endif
 167
 168 #ifndef HAVE_CONIO_H
 169 static int read_a_char(void)
 170 {
 171         char    c;
 172         int     r;
 173         int     fail = 0;
 174
 175         while(1) {
 176                 if (e2fsck_global_ctx &&
 177                     (e2fsck_global_ctx->flags & E2F_FLAG_CANCEL)) {
 178                         return 3;
 179                 }
 180                 r = read(0, &c, 1);
 181                 if (r == 1)
 182                         return c;
 183                 if (fail++ > 100)
 184                         break;
 185         }
 186         return EOF;
 187 }
 188 #endif
 189
 190 int ask_yn(e2fsck_t ctx, const char * string, int def)
 191 {
 192         int             c;
 193         const char      *defstr;
 194         const char      *short_yes = _("yY");
 195         const char      *short_no = _("nN");
 196         const char      *short_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         tcgetattr (0, &termios);
 205         tmp = termios;
 206         tmp.c_lflag &= ~(ICANON | ECHO);
 207         tmp.c_cc[VMIN] = 1;
 208         tmp.c_cc[VTIME] = 0;
 209         tcsetattr (0, TCSANOW, &tmp);
 210 #endif
 211
 212         if (def == 1)
 213                 defstr = _(_("<y>"));
 214         else if (def == 0)
 215                 defstr = _(_("<n>"));
 216         else
 217                 defstr = _(" (y/n)");
 218         /*
 219          * If the user presses 'y' more than 8 (but less than 12) times in
 220          * succession without pressing anything else, display a hint about
 221          * yes-to-all mode.
 222          */
 223         if (yes_answers > 12)
 224                 yes_answers = -1;
 225         else if (yes_answers > 8)
 226                 extra_prompt = yesall_prompt;
 227         log_out(ctx, "%s%s%s? ", string, extra_prompt, defstr);
 228         while (1) {
 229                 fflush (stdout);
 230                 if ((c = read_a_char()) == EOF)
 231                         break;
 232                 if (c == 3) {
 233 #ifdef HAVE_TERMIOS_H
 234                         tcsetattr (0, TCSANOW, &termios);
 235 #endif
 236                         if (ctx->flags & E2F_FLAG_SETJMP_OK) {
 237                                 log_out(ctx, "\n");
 238                                 longjmp(e2fsck_global_ctx->abort_loc, 1);
 239                         }
 240                         log_out(ctx, "%s", _("cancelled!\n"));
 241                         yes_answers = 0;
 242                         return 0;
 243                 }
 244                 if (strchr(short_yes, (char) c)) {
 245                         def = 1;
 246                         if (yes_answers >= 0)
 247                                 yes_answers++;
 248                         break;
 249                 } else if (strchr(short_no, (char) c)) {
 250                         def = 0;
 251                         yes_answers = -1;
 252                         break;
 253                 } else if (strchr(short_yesall, (char)c)) {
 254                         def = 2;
 255                         yes_answers = -1;
 256                         ctx->options |= E2F_OPT_YES;
 257                         break;
 258                 } else if ((c == 27 || c == ' ' || c == '\n') && (def != -1)) {
 259                         yes_answers = -1;
 260                         break;
 261                 }
 262         }
 263         if (def == 2)
 264                 log_out(ctx, "%s", _("yes to all\n"));
 265         else if (def)
 266                 log_out(ctx, "%s", _("yes\n"));
 267         else
 268                 log_out(ctx, "%s", _("no\n"));
 269 #ifdef HAVE_TERMIOS_H
 270         tcsetattr (0, TCSANOW, &termios);
 271 #endif
 272         return def;
 273 }
 274
 275 int ask (e2fsck_t ctx, const char * string, int def)
 276 {
 277         if (ctx->options & E2F_OPT_NO) {
 278                 log_out(ctx, _("%s? no\n\n"), string);
 279                 return 0;
 280         }
 281         if (ctx->options & E2F_OPT_YES) {
 282                 log_out(ctx, _("%s? yes\n\n"), string);
 283                 return 1;
 284         }
 285         if (ctx->options & E2F_OPT_PREEN) {
 286                 log_out(ctx, "%s? %s\n\n", string, def ? _("yes") : _("no"));
 287                 return def;
 288         }
 289         return ask_yn(ctx, string, def);
 290 }
 291
 292 void e2fsck_read_bitmaps(e2fsck_t ctx)
 293 {
 294         ext2_filsys fs = ctx->fs;
 295         errcode_t       retval;
 296         const char      *old_op;
 297         unsigned int    save_type;
 298         int             flags;
 299
 300         if (ctx->invalid_bitmaps) {
 301                 com_err(ctx->program_name, 0,
 302                     _("e2fsck_read_bitmaps: illegal bitmap block(s) for %s"),
 303                         ctx->device_name);
 304                 fatal_error(ctx, 0);
 305         }
 306
 307         old_op = ehandler_operation(_("reading inode and block bitmaps"));
 308         e2fsck_set_bitmap_type(fs, EXT2FS_BMAP64_RBTREE, "fs_bitmaps",
 309                                &save_type);
 310         flags = ctx->fs->flags;
 311         ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
 312         retval = ext2fs_read_bitmaps(fs);
 313         ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) |
 314                          (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS);
 315         fs->default_bitmap_type = save_type;
 316         ehandler_operation(old_op);
 317         if (retval) {
 318                 com_err(ctx->program_name, retval,
 319                         _("while retrying to read bitmaps for %s"),
 320                         ctx->device_name);
 321                 fatal_error(ctx, 0);
 322         }
 323 }
 324
 325 void e2fsck_write_bitmaps(e2fsck_t ctx)
 326 {
 327         ext2_filsys fs = ctx->fs;
 328         errcode_t       retval;
 329         const char      *old_op;
 330
 331         old_op = ehandler_operation(_("writing block and inode bitmaps"));
 332         retval = ext2fs_write_bitmaps(fs);
 333         ehandler_operation(old_op);
 334         if (retval) {
 335                 com_err(ctx->program_name, retval,
 336                         _("while rewriting block and inode bitmaps for %s"),
 337                         ctx->device_name);
 338                 fatal_error(ctx, 0);
 339         }
 340 }
 341
 342 void preenhalt(e2fsck_t ctx)
 343 {
 344         ext2_filsys fs = ctx->fs;
 345
 346         if (!(ctx->options & E2F_OPT_PREEN))
 347                 return;
 348         log_err(ctx, _("\n\n%s: UNEXPECTED INCONSISTENCY; "
 349                 "RUN fsck MANUALLY.\n\t(i.e., without -a or -p options)\n"),
 350                ctx->device_name);
 351         ctx->flags |= E2F_FLAG_EXITING;
 352         if (fs != NULL) {
 353                 fs->super->s_state |= EXT2_ERROR_FS;
 354                 ext2fs_mark_super_dirty(fs);
 355                 ext2fs_close_free(&fs);
 356         }
 357         exit(FSCK_UNCORRECTED);
 358 }
 359
 360 #ifdef RESOURCE_TRACK
 361 void init_resource_track(struct resource_track *track, io_channel channel)
 362 {
 363 #ifdef HAVE_GETRUSAGE
 364         struct rusage r;
 365 #endif
 366         io_stats io_start = 0;
 367
 368         track->brk_start = sbrk(0);
 369         gettimeofday(&track->time_start, 0);
 370 #ifdef HAVE_GETRUSAGE
 371 #ifdef sun
 372         memset(&r, 0, sizeof(struct rusage));
 373 #endif
 374         getrusage(RUSAGE_SELF, &r);
 375         track->user_start = r.ru_utime;
 376         track->system_start = r.ru_stime;
 377 #else
 378         track->user_start.tv_sec = track->user_start.tv_usec = 0;
 379         track->system_start.tv_sec = track->system_start.tv_usec = 0;
 380 #endif
 381         track->bytes_read = 0;
 382         track->bytes_written = 0;
 383         if (channel && channel->manager && channel->manager->get_stats)
 384                 channel->manager->get_stats(channel, &io_start);
 385         if (io_start) {
 386                 track->bytes_read = io_start->bytes_read;
 387                 track->bytes_written = io_start->bytes_written;
 388         }
 389 }
 390
 391 #ifdef __GNUC__
 392 #define _INLINE_ __inline__
 393 #else
 394 #define _INLINE_
 395 #endif
 396
 397 static _INLINE_ float timeval_subtract(struct timeval *tv1,
 398                                        struct timeval *tv2)
 399 {
 400         return ((tv1->tv_sec - tv2->tv_sec) +
 401                 ((float) (tv1->tv_usec - tv2->tv_usec)) / 1000000);
 402 }
 403
 404 void print_resource_track(e2fsck_t ctx, const char *desc,
 405                           struct resource_track *track, io_channel channel)
 406 {
 407 #ifdef HAVE_GETRUSAGE
 408         struct rusage r;
 409 #endif
 410 #ifdef HAVE_MALLINFO
 411         struct mallinfo malloc_info;
 412 #endif
 413         struct timeval time_end;
 414
 415         if ((desc && !(ctx->options & E2F_OPT_TIME2)) ||
 416             (!desc && !(ctx->options & E2F_OPT_TIME)))
 417                 return;
 418
 419         e2fsck_clear_progbar(ctx);
 420         gettimeofday(&time_end, 0);
 421
 422         if (desc)
 423                 log_out(ctx, "%s: ", desc);
 424
 425 #ifdef HAVE_MALLINFO
 426 #define kbytes(x)       (((unsigned long)(x) + 1023) / 1024)
 427
 428         malloc_info = mallinfo();
 429         log_out(ctx, _("Memory used: %luk/%luk (%luk/%luk), "),
 430                 kbytes(malloc_info.arena), kbytes(malloc_info.hblkhd),
 431                 kbytes(malloc_info.uordblks), kbytes(malloc_info.fordblks));
 432 #else
 433         log_out(ctx, _("Memory used: %lu, "),
 434                 (unsigned long) (((char *) sbrk(0)) -
 435                                  ((char *) track->brk_start)));
 436 #endif
 437 #ifdef HAVE_GETRUSAGE
 438         getrusage(RUSAGE_SELF, &r);
 439
 440         log_out(ctx, _("time: %5.2f/%5.2f/%5.2f\n"),
 441                 timeval_subtract(&time_end, &track->time_start),
 442                 timeval_subtract(&r.ru_utime, &track->user_start),
 443                 timeval_subtract(&r.ru_stime, &track->system_start));
 444 #else
 445         log_out(ctx, _("elapsed time: %6.3f\n"),
 446                 timeval_subtract(&time_end, &track->time_start));
 447 #endif
 448 #define mbytes(x)       (((x) + 1048575) / 1048576)
 449         if (channel && channel->manager && channel->manager->get_stats) {
 450                 io_stats delta = 0;
 451                 unsigned long long bytes_read = 0;
 452                 unsigned long long bytes_written = 0;
 453
 454                 if (desc)
 455                         log_out(ctx, "%s: ", desc);
 456
 457                 channel->manager->get_stats(channel, &delta);
 458                 if (delta) {
 459                         bytes_read = delta->bytes_read - track->bytes_read;
 460                         bytes_written = delta->bytes_written -
 461                                 track->bytes_written;
 462                 }
 463                 log_out(ctx, "I/O read: %lluMB, write: %lluMB, "
 464                         "rate: %.2fMB/s\n",
 465                         mbytes(bytes_read), mbytes(bytes_written),
 466                         (double)mbytes(bytes_read + bytes_written) /
 467                         timeval_subtract(&time_end, &track->time_start));
 468         }
 469 }
 470 #endif /* RESOURCE_TRACK */
 471
 472 void e2fsck_read_inode(e2fsck_t ctx, unsigned long ino,
 473                               struct ext2_inode * inode, const char *proc)
 474 {
 475         errcode_t retval;
 476
 477         retval = ext2fs_read_inode(ctx->fs, ino, inode);
 478         if (retval) {
 479                 com_err("ext2fs_read_inode", retval,
 480                         _("while reading inode %lu in %s"), ino, proc);
 481                 fatal_error(ctx, 0);
 482         }
 483 }
 484
 485 void e2fsck_read_inode_full(e2fsck_t ctx, unsigned long ino,
 486                             struct ext2_inode *inode, int bufsize,
 487                             const char *proc)
 488 {
 489         errcode_t retval;
 490
 491         retval = ext2fs_read_inode_full(ctx->fs, ino, inode, bufsize);
 492         if (retval) {
 493                 com_err("ext2fs_read_inode_full", retval,
 494                         _("while reading inode %lu in %s"), ino, proc);
 495                 fatal_error(ctx, 0);
 496         }
 497 }
 498
 499 void e2fsck_write_inode_full(e2fsck_t ctx, unsigned long ino,
 500                              struct ext2_inode * inode, int bufsize,
 501                              const char *proc)
 502 {
 503         errcode_t retval;
 504
 505         retval = ext2fs_write_inode_full(ctx->fs, ino, inode, bufsize);
 506         if (retval) {
 507                 com_err("ext2fs_write_inode", retval,
 508                         _("while writing inode %lu in %s"), ino, proc);
 509                 fatal_error(ctx, 0);
 510         }
 511 }
 512
 513 void e2fsck_write_inode(e2fsck_t ctx, unsigned long ino,
 514                         struct ext2_inode * inode, const char *proc)
 515 {
 516         errcode_t retval;
 517
 518         retval = ext2fs_write_inode(ctx->fs, ino, inode);
 519         if (retval) {
 520                 com_err("ext2fs_write_inode", retval,
 521                         _("while writing inode %lu in %s"), ino, proc);
 522                 fatal_error(ctx, 0);
 523         }
 524 }
 525
 526 #ifdef MTRACE
 527 void mtrace_print(char *mesg)
 528 {
 529         FILE    *malloc_get_mallstream();
 530         FILE    *f = malloc_get_mallstream();
 531
 532         if (f)
 533                 fprintf(f, "============= %s\n", mesg);
 534 }
 535 #endif
 536
 537 blk64_t get_backup_sb(e2fsck_t ctx, ext2_filsys fs, const char *name,
 538                       io_manager manager)
 539 {
 540         struct ext2_super_block *sb;
 541         io_channel              io = NULL;
 542         void                    *buf = NULL;
 543         int                     blocksize;
 544         blk64_t                 superblock, ret_sb = 8193;
 545
 546         if (fs && fs->super) {
 547                 ret_sb = (fs->super->s_blocks_per_group +
 548                           fs->super->s_first_data_block);
 549                 if (ctx) {
 550                         ctx->superblock = ret_sb;
 551                         ctx->blocksize = fs->blocksize;
 552                 }
 553                 return ret_sb;
 554         }
 555
 556         if (ctx) {
 557                 if (ctx->blocksize) {
 558                         ret_sb = ctx->blocksize * 8;
 559                         if (ctx->blocksize == 1024)
 560                                 ret_sb++;
 561                         ctx->superblock = ret_sb;
 562                         return ret_sb;
 563                 }
 564                 ctx->superblock = ret_sb;
 565                 ctx->blocksize = 1024;
 566         }
 567
 568         if (!name || !manager)
 569                 goto cleanup;
 570
 571         if (manager->open(name, 0, &io) != 0)
 572                 goto cleanup;
 573
 574         if (ext2fs_get_mem(SUPERBLOCK_SIZE, &buf))
 575                 goto cleanup;
 576         sb = (struct ext2_super_block *) buf;
 577
 578         for (blocksize = EXT2_MIN_BLOCK_SIZE;
 579              blocksize <= EXT2_MAX_BLOCK_SIZE ; blocksize *= 2) {
 580                 superblock = blocksize*8;
 581                 if (blocksize == 1024)
 582                         superblock++;
 583                 io_channel_set_blksize(io, blocksize);
 584                 if (io_channel_read_blk64(io, superblock,
 585                                         -SUPERBLOCK_SIZE, buf))
 586                         continue;
 587 #ifdef WORDS_BIGENDIAN
 588                 if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
 589                         ext2fs_swap_super(sb);
 590 #endif
 591                 if ((sb->s_magic == EXT2_SUPER_MAGIC) &&
 592                     (EXT2_BLOCK_SIZE(sb) == blocksize)) {
 593                         ret_sb = superblock;
 594                         if (ctx) {
 595                                 ctx->superblock = superblock;
 596                                 ctx->blocksize = blocksize;
 597                         }
 598                         break;
 599                 }
 600         }
 601
 602 cleanup:
 603         if (io)
 604                 io_channel_close(io);
 605         if (buf)
 606                 ext2fs_free_mem(&buf);
 607         return (ret_sb);
 608 }
 609
 610 /*
 611  * Given a mode, return the ext2 file type
 612  */
 613 int ext2_file_type(unsigned int mode)
 614 {
 615         if (LINUX_S_ISREG(mode))
 616                 return EXT2_FT_REG_FILE;
 617
 618         if (LINUX_S_ISDIR(mode))
 619                 return EXT2_FT_DIR;
 620
 621         if (LINUX_S_ISCHR(mode))
 622                 return EXT2_FT_CHRDEV;
 623
 624         if (LINUX_S_ISBLK(mode))
 625                 return EXT2_FT_BLKDEV;
 626
 627         if (LINUX_S_ISLNK(mode))
 628                 return EXT2_FT_SYMLINK;
 629
 630         if (LINUX_S_ISFIFO(mode))
 631                 return EXT2_FT_FIFO;
 632
 633         if (LINUX_S_ISSOCK(mode))
 634                 return EXT2_FT_SOCK;
 635
 636         return 0;
 637 }
 638
 639 /*
 640  * Check to see if a filesystem is in /proc/filesystems.
 641  * Returns 1 if found, 0 if not
 642  */
 643 int fs_proc_check(const char *fs_name)
 644 {
 645         FILE    *f;
 646         char    buf[80], *cp, *t;
 647
 648         f = fopen("/proc/filesystems", "r");
 649         if (!f)
 650                 return (0);
 651         while (!feof(f)) {
 652                 if (!fgets(buf, sizeof(buf), f))
 653                         break;
 654                 cp = buf;
 655                 if (!isspace(*cp)) {
 656                         while (*cp && !isspace(*cp))
 657                                 cp++;
 658                 }
 659                 while (*cp && isspace(*cp))
 660                         cp++;
 661                 if ((t = strchr(cp, '\n')) != NULL)
 662                         *t = 0;
 663                 if ((t = strchr(cp, '\t')) != NULL)
 664                         *t = 0;
 665                 if ((t = strchr(cp, ' ')) != NULL)
 666                         *t = 0;
 667                 if (!strcmp(fs_name, cp)) {
 668                         fclose(f);
 669                         return (1);
 670                 }
 671         }
 672         fclose(f);
 673         return (0);
 674 }
 675
 676 /*
 677  * Check to see if a filesystem is available as a module
 678  * Returns 1 if found, 0 if not
 679  */
 680 int check_for_modules(const char *fs_name)
 681 {
 682 #ifdef __linux__
 683         struct utsname  uts;
 684         FILE            *f;
 685         char            buf[1024], *cp, *t;
 686         int             i;
 687
 688         if (uname(&uts))
 689                 return (0);
 690         snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
 691
 692         f = fopen(buf, "r");
 693         if (!f)
 694                 return (0);
 695         while (!feof(f)) {
 696                 if (!fgets(buf, sizeof(buf), f))
 697                         break;
 698                 if ((cp = strchr(buf, ':')) != NULL)
 699                         *cp = 0;
 700                 else
 701                         continue;
 702                 if ((cp = strrchr(buf, '/')) != NULL)
 703                         cp++;
 704                 else
 705                         cp = buf;
 706                 i = strlen(cp);
 707                 if (i > 3) {
 708                         t = cp + i - 3;
 709                         if (!strcmp(t, ".ko"))
 710                                 *t = 0;
 711                 }
 712                 if (!strcmp(cp, fs_name)) {
 713                         fclose(f);
 714                         return (1);
 715                 }
 716         }
 717         fclose(f);
 718 #endif /* __linux__ */
 719         return (0);
 720 }
 721
 722 /*
 723  * Helper function that does the right thing if write returns a
 724  * partial write, or an EGAIN/EINTR error.
 725  */
 726 int write_all(int fd, char *buf, size_t count)
 727 {
 728         ssize_t ret;
 729         int c = 0;
 730
 731         while (count > 0) {
 732                 ret = write(fd, buf, count);
 733                 if (ret < 0) {
 734                         if ((errno == EAGAIN) || (errno == EINTR))
 735                                 continue;
 736                         return -1;
 737                 }
 738                 count -= ret;
 739                 buf += ret;
 740                 c += ret;
 741         }
 742         return c;
 743 }
 744
 745 void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
 746 {
 747
 748         if (msg)
 749                 printf("MMP check failed: %s\n", msg);
 750         if (mmp) {
 751                 time_t t = mmp->mmp_time;
 752
 753                 printf("MMP error info: last update: %s node: %s device: %s\n",
 754                        ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname);
 755         }
 756 }
 757
 758 errcode_t e2fsck_mmp_update(ext2_filsys fs)
 759 {
 760         errcode_t retval;
 761
 762         retval = ext2fs_mmp_update(fs);
 763         if (retval == EXT2_ET_MMP_CHANGE_ABORT)
 764                 dump_mmp_msg(fs->mmp_cmp,
 765                              _("UNEXPECTED INCONSISTENCY: the filesystem is "
 766                                "being modified while fsck is running.\n"));
 767
 768         return retval;
 769 }
 770
 771 void e2fsck_set_bitmap_type(ext2_filsys fs, unsigned int default_type,
 772                             const char *profile_name, unsigned int *old_type)
 773 {
 774         unsigned type;
 775         e2fsck_t ctx = (e2fsck_t) fs->priv_data;
 776
 777         if (old_type)
 778                 *old_type = fs->default_bitmap_type;
 779         profile_get_uint(ctx->profile, "bitmaps", profile_name, 0,
 780                          default_type, &type);
 781         profile_get_uint(ctx->profile, "bitmaps", "all", 0, type, &type);
 782         fs->default_bitmap_type = type ? type : default_type;
 783 }
 784
 785 errcode_t e2fsck_allocate_inode_bitmap(ext2_filsys fs, const char *descr,
 786                                        int deftype,
 787                                        const char *name,
 788                                        ext2fs_inode_bitmap *ret)
 789 {
 790         errcode_t       retval;
 791         unsigned int    save_type;
 792
 793         e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
 794         retval = ext2fs_allocate_inode_bitmap(fs, descr, ret);
 795         fs->default_bitmap_type = save_type;
 796         return retval;
 797 }
 798
 799 errcode_t e2fsck_allocate_block_bitmap(ext2_filsys fs, const char *descr,
 800                                        int deftype,
 801                                        const char *name,
 802                                        ext2fs_block_bitmap *ret)
 803 {
 804         errcode_t       retval;
 805         unsigned int    save_type;
 806
 807         e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
 808         retval = ext2fs_allocate_block_bitmap(fs, descr, ret);
 809         fs->default_bitmap_type = save_type;
 810         return retval;
 811 }
 812
 813 errcode_t e2fsck_allocate_subcluster_bitmap(ext2_filsys fs, const char *descr,
 814                                             int deftype,
 815                                             const char *name,
 816                                             ext2fs_block_bitmap *ret)
 817 {
 818         errcode_t       retval;
 819         unsigned int    save_type;
 820
 821         e2fsck_set_bitmap_type(fs, deftype, name, &save_type);
 822         retval = ext2fs_allocate_subcluster_bitmap(fs, descr, ret);
 823         fs->default_bitmap_type = save_type;
 824         return retval;
 825 }
 826
 827 /* Return memory size in bytes */
 828 unsigned long long get_memory_size(void)
 829 {
 830 #if defined(_SC_PHYS_PAGES)
 831 # if defined(_SC_PAGESIZE)
 832         return (unsigned long long)sysconf(_SC_PHYS_PAGES) *
 833                (unsigned long long)sysconf(_SC_PAGESIZE);
 834 # elif defined(_SC_PAGE_SIZE)
 835         return (unsigned long long)sysconf(_SC_PHYS_PAGES) *
 836                (unsigned long long)sysconf(_SC_PAGE_SIZE);
 837 # endif
 838 #elif defined(CTL_HW)
 839 # if (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
 840 #  define CTL_HW_INT64
 841 # elif (defined(HW_PHYSMEM) || defined(HW_REALMEM))
 842 #  define CTL_HW_UINT
 843 # endif
 844         int mib[2];
 845
 846         mib[0] = CTL_HW;
 847 # if defined(HW_MEMSIZE)
 848         mib[1] = HW_MEMSIZE;
 849 # elif defined(HW_PHYSMEM64)
 850         mib[1] = HW_PHYSMEM64;
 851 # elif defined(HW_REALMEM)
 852         mib[1] = HW_REALMEM;
 853 # elif defined(HW_PYSMEM)
 854         mib[1] = HW_PHYSMEM;
 855 # endif
 856 # if defined(CTL_HW_INT64)
 857         unsigned long long size = 0;
 858 # elif defined(CTL_HW_UINT)
 859         unsigned int size = 0;
 860 # endif
 861 # if defined(CTL_HW_INT64) || defined(CTL_HW_UINT)
 862         size_t len = sizeof(size);
 863
 864         if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
 865                 return (unsigned long long)size;
 866 # endif
 867         return 0;
 868 #else
 869 # warning "Don't know how to detect memory on your platform?"
 870         return 0;
 871 #endif
 872 }