Theodore Ts'o | 3839e65 | 1997-04-26 13:21:57 +0000 | [diff] [blame] | 1 | /* |
| 2 | * e2fsck.c - a consistency checker for the new extended file system. |
| 3 | * |
| 4 | * Copyright (C) 1993, 1994 Theodore Ts'o. This file may be |
| 5 | * redistributed under the terms of the GNU Public License. |
| 6 | */ |
| 7 | |
| 8 | /* Usage: e2fsck [-dfpnsvy] device |
| 9 | * -d -- debugging this program |
| 10 | * -f -- check the fs even if it is marked valid |
| 11 | * -p -- "preen" the filesystem |
| 12 | * -n -- open the filesystem r/o mode; never try to fix problems |
| 13 | * -v -- verbose (tells how many files) |
| 14 | * -y -- always answer yes to questions |
| 15 | * |
| 16 | * The device may be a block device or a image of one, but this isn't |
| 17 | * enforced (but it's not much fun on a character device :-). |
| 18 | */ |
| 19 | |
| 20 | #include <string.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <ctype.h> |
| 23 | #include <termios.h> |
| 24 | #include <time.h> |
| 25 | #include <getopt.h> |
| 26 | #include <unistd.h> |
| 27 | #include <mntent.h> |
| 28 | #include <sys/ioctl.h> |
| 29 | #include <malloc.h> |
| 30 | |
| 31 | #include "et/com_err.h" |
| 32 | #include "e2fsck.h" |
| 33 | #include "../version.h" |
| 34 | |
| 35 | extern int isatty(int); |
| 36 | |
| 37 | const char * program_name = "e2fsck"; |
| 38 | const char * device_name = NULL; |
| 39 | |
| 40 | /* Command line options */ |
| 41 | int nflag = 0; |
| 42 | int yflag = 0; |
| 43 | int tflag = 0; /* Do timing */ |
| 44 | int cflag = 0; /* check disk */ |
| 45 | int preen = 0; |
| 46 | int rwflag = 1; |
| 47 | int inode_buffer_blocks = 0; |
| 48 | blk_t superblock; |
| 49 | int blocksize = 0; |
| 50 | int verbose = 0; |
| 51 | int list = 0; |
| 52 | int debug = 0; |
| 53 | int force = 0; |
| 54 | static int show_version_only = 0; |
| 55 | |
| 56 | static int replace_bad_blocks = 0; |
| 57 | static char *bad_blocks_file = 0; |
| 58 | |
| 59 | static int possible_block_sizes[] = { 1024, 2048, 4096, 8192, 0}; |
| 60 | |
| 61 | struct resource_track global_rtrack; |
| 62 | |
| 63 | static int root_filesystem = 0; |
| 64 | static int read_only_root = 0; |
| 65 | |
| 66 | static void usage(NOARGS) |
| 67 | { |
| 68 | fprintf(stderr, |
| 69 | "Usage: %s [-panyrdfvtFV] [-b superblock] [-B blocksize]\n" |
| 70 | "\t\tdevice\n", program_name); |
| 71 | exit(FSCK_USAGE); |
| 72 | } |
| 73 | |
| 74 | static void show_stats(ext2_filsys fs) |
| 75 | { |
| 76 | int inodes, inodes_used, blocks, blocks_used; |
| 77 | int dir_links; |
| 78 | int num_files, num_links; |
| 79 | |
| 80 | dir_links = 2 * fs_directory_count - 1; |
| 81 | num_files = fs_total_count - dir_links; |
| 82 | num_links = fs_links_count - dir_links; |
| 83 | inodes = fs->super->s_inodes_count; |
| 84 | inodes_used = (fs->super->s_inodes_count - |
| 85 | fs->super->s_free_inodes_count); |
| 86 | blocks = fs->super->s_blocks_count; |
| 87 | blocks_used = (fs->super->s_blocks_count - |
| 88 | fs->super->s_free_blocks_count); |
| 89 | |
| 90 | if (!verbose) { |
| 91 | printf("%s: %d/%d files, %d/%d blocks\n", device_name, |
| 92 | inodes_used, inodes, blocks_used, blocks); |
| 93 | return; |
| 94 | } |
| 95 | printf ("\n%6d inode%s used (%d%%)\n", inodes_used, |
| 96 | (inodes_used != 1) ? "s" : "", |
| 97 | 100 * inodes_used / inodes); |
| 98 | printf ("%6d block%s used (%d%%)\n" |
| 99 | "%6d bad block%s\n", blocks_used, |
| 100 | (blocks_used != 1) ? "s" : "", |
| 101 | 100 * blocks_used / blocks, fs_badblocks_count, |
| 102 | fs_badblocks_count != 1 ? "s" : ""); |
| 103 | printf ("\n%6d regular file%s\n" |
| 104 | "%6d director%s\n" |
| 105 | "%6d character device file%s\n" |
| 106 | "%6d block device file%s\n" |
| 107 | "%6d fifo%s\n" |
| 108 | "%6d link%s\n" |
| 109 | "%6d symbolic link%s (%d fast symbolic link%s)\n" |
| 110 | "%6d socket%s\n" |
| 111 | "------\n" |
| 112 | "%6d file%s\n", |
| 113 | fs_regular_count, (fs_regular_count != 1) ? "s" : "", |
| 114 | fs_directory_count, (fs_directory_count != 1) ? "ies" : "y", |
| 115 | fs_chardev_count, (fs_chardev_count != 1) ? "s" : "", |
| 116 | fs_blockdev_count, (fs_blockdev_count != 1) ? "s" : "", |
| 117 | fs_fifo_count, (fs_fifo_count != 1) ? "s" : "", |
| 118 | fs_links_count - dir_links, |
| 119 | ((fs_links_count - dir_links) != 1) ? "s" : "", |
| 120 | fs_symlinks_count, (fs_symlinks_count != 1) ? "s" : "", |
| 121 | fs_fast_symlinks_count, (fs_fast_symlinks_count != 1) ? "s" : "", |
| 122 | fs_sockets_count, (fs_sockets_count != 1) ? "s" : "", |
| 123 | fs_total_count - dir_links, |
| 124 | ((fs_total_count - dir_links) != 1) ? "s" : ""); |
| 125 | } |
| 126 | |
| 127 | static void check_mount(NOARGS) |
| 128 | { |
| 129 | FILE * f; |
| 130 | struct mntent * mnt; |
| 131 | int cont; |
| 132 | int fd; |
| 133 | |
| 134 | if ((f = setmntent (MOUNTED, "r")) == NULL) |
| 135 | return; |
| 136 | while ((mnt = getmntent (f)) != NULL) |
| 137 | if (strcmp (device_name, mnt->mnt_fsname) == 0) |
| 138 | break; |
| 139 | endmntent (f); |
| 140 | if (!mnt) |
| 141 | return; |
| 142 | |
| 143 | if (!strcmp(mnt->mnt_dir, "/")) |
| 144 | root_filesystem = 1; |
| 145 | |
| 146 | /* |
| 147 | * If the root is mounted read-only, then /etc/mtab is |
| 148 | * probably not correct; so we won't issue a warning based on |
| 149 | * it. |
| 150 | */ |
| 151 | fd = open(MOUNTED, O_RDWR); |
| 152 | if (fd < 0) { |
| 153 | if (errno == EROFS) { |
| 154 | read_only_root = 1; |
| 155 | return; |
| 156 | } |
| 157 | } else |
| 158 | close(fd); |
| 159 | |
| 160 | if (!rwflag) { |
| 161 | printf("Warning! %s is mounted.\n", device_name); |
| 162 | return; |
| 163 | } |
| 164 | |
| 165 | printf ("%s is mounted. ", device_name); |
| 166 | if (isatty (0) && isatty (1)) |
| 167 | cont = ask_yn("Do you really want to continue", -1); |
| 168 | else |
| 169 | cont = 0; |
| 170 | if (!cont) { |
| 171 | printf ("check aborted.\n"); |
| 172 | exit (0); |
| 173 | } |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | static void sync_disks(NOARGS) |
| 178 | { |
| 179 | sync(); |
| 180 | sync(); |
| 181 | sleep(1); |
| 182 | sync(); |
| 183 | } |
| 184 | |
| 185 | static void check_super_block(ext2_filsys fs) |
| 186 | { |
| 187 | blk_t first_block, last_block; |
| 188 | int blocks_per_group = fs->super->s_blocks_per_group; |
| 189 | int i; |
| 190 | |
| 191 | first_block = fs->super->s_first_data_block; |
| 192 | last_block = first_block + blocks_per_group; |
| 193 | |
| 194 | for (i = 0; i < fs->group_desc_count; i++) { |
| 195 | if ((fs->group_desc[i].bg_block_bitmap < first_block) || |
| 196 | (fs->group_desc[i].bg_block_bitmap >= last_block)) { |
| 197 | printf("Block bitmap %ld for group %d not in group.\n", |
| 198 | fs->group_desc[i].bg_block_bitmap, i); |
| 199 | fatal_error(0); |
| 200 | } |
| 201 | if ((fs->group_desc[i].bg_inode_bitmap < first_block) || |
| 202 | (fs->group_desc[i].bg_inode_bitmap >= last_block)) { |
| 203 | printf("Inode bitmap %ld for group %d not in group.\n", |
| 204 | fs->group_desc[i].bg_inode_bitmap, i); |
| 205 | fatal_error(0); |
| 206 | } |
| 207 | if ((fs->group_desc[i].bg_inode_table < first_block) || |
| 208 | ((fs->group_desc[i].bg_inode_table + |
| 209 | fs->inode_blocks_per_group - 1) >= last_block)) { |
| 210 | printf("Inode table %ld for group %d not in group.\n", |
| 211 | fs->group_desc[i].bg_inode_table, i); |
| 212 | fatal_error(0); |
| 213 | } |
| 214 | first_block += fs->super->s_blocks_per_group; |
| 215 | last_block += fs->super->s_blocks_per_group; |
| 216 | } |
| 217 | return; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * This routine checks to see if a filesystem can be skipped; if so, |
| 222 | * it will exit with E2FSCK_OK. Under some conditions it will print a |
| 223 | * message explaining why a check is being forced. |
| 224 | */ |
| 225 | static void check_if_skip(ext2_filsys fs) |
| 226 | { |
| 227 | const char *reason = NULL; |
| 228 | |
| 229 | if (force || bad_blocks_file || cflag) |
| 230 | return; |
| 231 | |
| 232 | if (fs->super->s_state & EXT2_ERROR_FS) |
| 233 | reason = "contains a file system with errors"; |
| 234 | else if (fs->super->s_mnt_count >= |
| 235 | (unsigned) fs->super->s_max_mnt_count) |
| 236 | reason = "has reached maximal mount count"; |
| 237 | else if (fs->super->s_checkinterval && |
| 238 | time(0) >= (fs->super->s_lastcheck + |
| 239 | fs->super->s_checkinterval)) |
| 240 | reason = "has gone too long without being checked"; |
| 241 | if (reason) { |
| 242 | printf("%s %s, check forced.\n", device_name, reason); |
| 243 | return; |
| 244 | } |
| 245 | if (fs->super->s_state & EXT2_VALID_FS) { |
| 246 | printf("%s is clean, no check.\n", device_name); |
| 247 | exit(FSCK_OK); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | static void PRS(int argc, char *argv[]) |
| 252 | { |
| 253 | int flush = 0; |
| 254 | char c; |
| 255 | #ifdef MTRACE |
| 256 | extern void *mallwatch; |
| 257 | #endif |
| 258 | char *oldpath, newpath[PATH_MAX]; |
| 259 | |
| 260 | /* Update our PATH to include /sbin */ |
| 261 | strcpy(newpath, "PATH=/sbin:"); |
| 262 | if ((oldpath = getenv("PATH")) != NULL) |
| 263 | strcat(newpath, oldpath); |
| 264 | putenv(newpath); |
| 265 | |
| 266 | setbuf(stdout, NULL); |
| 267 | setbuf(stderr, NULL); |
| 268 | initialize_ext2_error_table(); |
| 269 | |
| 270 | if (argc && *argv) |
| 271 | program_name = *argv; |
| 272 | while ((c = getopt (argc, argv, "panyrcB:dfvtFVM:b:I:P:l:L:")) != EOF) |
| 273 | switch (c) { |
| 274 | case 'p': |
| 275 | case 'a': |
| 276 | preen = 1; |
| 277 | yflag = nflag = 0; |
| 278 | break; |
| 279 | case 'n': |
| 280 | nflag = 1; |
| 281 | preen = yflag = 0; |
| 282 | break; |
| 283 | case 'y': |
| 284 | yflag = 1; |
| 285 | preen = nflag = 0; |
| 286 | break; |
| 287 | case 't': |
| 288 | tflag++; |
| 289 | break; |
| 290 | case 'c': |
| 291 | cflag++; |
| 292 | break; |
| 293 | case 'r': |
| 294 | /* What we do by default, anyway! */ |
| 295 | break; |
| 296 | case 'b': |
| 297 | superblock = atoi(optarg); |
| 298 | break; |
| 299 | case 'B': |
| 300 | blocksize = atoi(optarg); |
| 301 | break; |
| 302 | case 'I': |
| 303 | inode_buffer_blocks = atoi(optarg); |
| 304 | break; |
| 305 | case 'P': |
| 306 | process_inode_size = atoi(optarg); |
| 307 | break; |
| 308 | case 'L': |
| 309 | replace_bad_blocks++; |
| 310 | case 'l': |
| 311 | bad_blocks_file = malloc(strlen(optarg)+1); |
| 312 | if (!bad_blocks_file) |
| 313 | fatal_error("Couldn't malloc bad_blocks_file"); |
| 314 | strcpy(bad_blocks_file, optarg); |
| 315 | break; |
| 316 | case 'd': |
| 317 | debug = 1; |
| 318 | break; |
| 319 | case 'f': |
| 320 | force = 1; |
| 321 | break; |
| 322 | case 'F': |
| 323 | flush = 1; |
| 324 | break; |
| 325 | case 'v': |
| 326 | verbose = 1; |
| 327 | break; |
| 328 | case 'V': |
| 329 | show_version_only = 1; |
| 330 | break; |
| 331 | #ifdef MTRACE |
| 332 | case 'M': |
| 333 | mallwatch = (void *) strtol(optarg, NULL, 0); |
| 334 | break; |
| 335 | #endif |
| 336 | default: |
| 337 | usage (); |
| 338 | } |
| 339 | if (show_version_only) |
| 340 | return; |
| 341 | if (optind != argc - 1) |
| 342 | usage (); |
| 343 | if (nflag && !bad_blocks_file && !cflag) |
| 344 | rwflag = 0; |
| 345 | device_name = argv[optind]; |
| 346 | if (flush) { |
| 347 | int fd = open(device_name, O_RDONLY, 0); |
| 348 | |
| 349 | if (fd < 0) { |
| 350 | com_err("open", errno, "while opening %s for flushing", |
| 351 | device_name); |
| 352 | exit(FSCK_ERROR); |
| 353 | } |
| 354 | if (ioctl(fd, BLKFLSBUF, 0) < 0) { |
| 355 | com_err("BLKFLSBUF", errno, "while trying to flush %s", |
| 356 | device_name); |
| 357 | exit(FSCK_ERROR); |
| 358 | } |
| 359 | close(fd); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | int main (int argc, char *argv[]) |
| 364 | { |
| 365 | errcode_t retval = 0; |
| 366 | int exit_value = FSCK_OK; |
| 367 | int i; |
| 368 | ext2_filsys fs; |
| 369 | |
| 370 | #ifdef MTRACE |
| 371 | mtrace(); |
| 372 | #endif |
| 373 | #ifdef MCHECK |
| 374 | mcheck(0); |
| 375 | #endif |
| 376 | |
| 377 | init_resource_track(&global_rtrack); |
| 378 | |
| 379 | PRS(argc, argv); |
| 380 | |
| 381 | if (!preen) |
| 382 | fprintf (stderr, "e2fsck %s, %s for EXT2 FS %s, %s\n", |
| 383 | E2FSPROGS_VERSION, E2FSPROGS_DATE, |
| 384 | EXT2FS_VERSION, EXT2FS_DATE); |
| 385 | |
| 386 | if (show_version_only) |
| 387 | exit(0); |
| 388 | |
| 389 | check_mount(); |
| 390 | |
| 391 | if (!preen && !nflag && !yflag) { |
| 392 | if (!isatty (0) || !isatty (1)) |
| 393 | die ("need terminal for interactive repairs"); |
| 394 | } |
| 395 | sync_disks(); |
| 396 | if (superblock && blocksize) { |
| 397 | retval = ext2fs_open(device_name, rwflag ? EXT2_FLAG_RW : 0, |
| 398 | superblock, blocksize, unix_io_manager, |
| 399 | &fs); |
| 400 | } else if (superblock) { |
| 401 | for (i=0; possible_block_sizes[i]; i++) { |
| 402 | retval = ext2fs_open(device_name, |
| 403 | rwflag ? EXT2_FLAG_RW : 0, |
| 404 | superblock, |
| 405 | possible_block_sizes[i], |
| 406 | unix_io_manager, &fs); |
| 407 | if (!retval) |
| 408 | break; |
| 409 | } |
| 410 | } else |
| 411 | retval = ext2fs_open(device_name, rwflag ? EXT2_FLAG_RW : 0, |
| 412 | 0, 0, unix_io_manager, &fs); |
| 413 | if (retval) { |
| 414 | com_err(program_name, retval, "while trying to open %s", |
| 415 | device_name); |
| 416 | printf("Couldn't find valid filesystem superblock.\n"); |
| 417 | fatal_error(0); |
| 418 | } |
| 419 | /* |
| 420 | * If the user specified a specific superblock, presumably the |
| 421 | * master superblock has been trashed. So we mark the |
| 422 | * superblock as dirty, so it can be written out. |
| 423 | */ |
| 424 | if (superblock && rwflag) |
| 425 | ext2fs_mark_super_dirty(fs); |
| 426 | |
| 427 | ehandler_init(fs->io); |
| 428 | |
| 429 | check_super_block(fs); |
| 430 | check_if_skip(fs); |
| 431 | if (bad_blocks_file) |
| 432 | read_bad_blocks_file(fs, bad_blocks_file, replace_bad_blocks); |
| 433 | else if (cflag) |
| 434 | test_disk(fs); |
| 435 | |
| 436 | /* |
| 437 | * Mark the system as valid, 'til proven otherwise |
| 438 | */ |
| 439 | ext2fs_mark_valid(fs); |
| 440 | |
| 441 | pass1(fs); |
| 442 | pass2(fs); |
| 443 | pass3(fs); |
| 444 | pass4(fs); |
| 445 | pass5(fs); |
| 446 | |
| 447 | #ifdef MTRACE |
| 448 | mtrace_print("Cleanup"); |
| 449 | #endif |
| 450 | if (ext2fs_test_changed(fs)) { |
| 451 | exit_value = FSCK_NONDESTRUCT; |
| 452 | if (!preen) |
| 453 | printf("\n%s: ***** FILE SYSTEM WAS MODIFIED *****\n", |
| 454 | device_name); |
| 455 | if (root_filesystem && !read_only_root) { |
| 456 | printf("%s: ***** REBOOT LINUX *****\n", device_name); |
| 457 | exit_value = FSCK_REBOOT; |
| 458 | } |
| 459 | } |
| 460 | if (!ext2fs_test_valid(fs)) |
| 461 | exit_value = FSCK_UNCORRECTED; |
| 462 | if (rwflag) { |
| 463 | if (ext2fs_test_valid(fs)) |
| 464 | fs->super->s_state = EXT2_VALID_FS; |
| 465 | else |
| 466 | fs->super->s_state &= ~EXT2_VALID_FS; |
| 467 | fs->super->s_mnt_count = 0; |
| 468 | fs->super->s_lastcheck = time(NULL); |
| 469 | ext2fs_mark_super_dirty(fs); |
| 470 | } |
| 471 | show_stats(fs); |
| 472 | |
| 473 | write_bitmaps(fs); |
| 474 | ext2fs_close(fs); |
| 475 | sync_disks(); |
| 476 | |
| 477 | if (tflag) |
| 478 | print_resource_track(&global_rtrack); |
| 479 | |
| 480 | return exit_value; |
| 481 | } |