resize/main.c

   1 /*
   2  * main.c --- ext2 resizer main program
   3  *
   4  * Copyright (C) 1997, 1998 by Theodore Ts'o and
   5  *      PowerQuest, Inc.
   6  *
   7  * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o
   8  *
   9  * %Begin-Header%
  10  * This file may be redistributed under the terms of the GNU Public
  11  * License.
  12  * %End-Header%
  13  */
  14
  15 #ifndef _LARGEFILE_SOURCE
  16 #define _LARGEFILE_SOURCE
  17 #endif
  18 #ifndef _LARGEFILE64_SOURCE
  19 #define _LARGEFILE64_SOURCE
  20 #endif
  21
  22 #include "config.h"
  23 #ifdef HAVE_GETOPT_H
  24 #include <getopt.h>
  25 #else
  26 extern char *optarg;
  27 extern int optind;
  28 #endif
  29 #include <unistd.h>
  30 #ifdef HAVE_STDLIB_H
  31 #include <stdlib.h>
  32 #endif
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <libgen.h>
  37
  38 #include "e2p/e2p.h"
  39
  40 #include "resize2fs.h"
  41
  42 #include "../version.h"
  43
  44 char *program_name;
  45 static char *device_name, *io_options;
  46
  47 static void usage (char *prog)
  48 {
  49         fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
  50                            "[-p] device [-b|-s|new_size] [-z undo_file]\n\n"),
  51                  prog);
  52
  53         exit (1);
  54 }
  55
  56 static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
  57                                       unsigned long cur, unsigned long max)
  58 {
  59         ext2_sim_progmeter progress;
  60         const char      *label;
  61         errcode_t       retval;
  62
  63         progress = (ext2_sim_progmeter) rfs->prog_data;
  64         if (max == 0)
  65                 return 0;
  66         if (cur == 0) {
  67                 if (progress)
  68                         ext2fs_progress_close(progress);
  69                 progress = 0;
  70                 switch (pass) {
  71                 case E2_RSZ_EXTEND_ITABLE_PASS:
  72                         label = _("Extending the inode table");
  73                         break;
  74                 case E2_RSZ_BLOCK_RELOC_PASS:
  75                         label = _("Relocating blocks");
  76                         break;
  77                 case E2_RSZ_INODE_SCAN_PASS:
  78                         label = _("Scanning inode table");
  79                         break;
  80                 case E2_RSZ_INODE_REF_UPD_PASS:
  81                         label = _("Updating inode references");
  82                         break;
  83                 case E2_RSZ_MOVE_ITABLE_PASS:
  84                         label = _("Moving inode table");
  85                         break;
  86                 default:
  87                         label = _("Unknown pass?!?");
  88                         break;
  89                 }
  90                 printf(_("Begin pass %d (max = %lu)\n"), pass, max);
  91                 retval = ext2fs_progress_init(&progress, label, 30,
  92                                               40, max, 0);
  93                 if (retval)
  94                         progress = 0;
  95                 rfs->prog_data = (void *) progress;
  96         }
  97         if (progress)
  98                 ext2fs_progress_update(progress, cur);
  99         if (cur >= max) {
 100                 if (progress)
 101                         ext2fs_progress_close(progress);
 102                 progress = 0;
 103                 rfs->prog_data = 0;
 104         }
 105         return 0;
 106 }
 107
 108 static void determine_fs_stride(ext2_filsys fs)
 109 {
 110         unsigned int    group;
 111         unsigned long long sum;
 112         unsigned int    has_sb, prev_has_sb = 0, num;
 113         int             i_stride, b_stride;
 114         int             flexbg_size = 1 << fs->super->s_log_groups_per_flex;
 115
 116         if (fs->stride)
 117                 return;
 118         num = 0; sum = 0;
 119         for (group = 0; group < fs->group_desc_count; group++) {
 120                 has_sb = ext2fs_bg_has_super(fs, group);
 121                 if (group == 0 || has_sb != prev_has_sb)
 122                         goto next;
 123                 b_stride = ext2fs_block_bitmap_loc(fs, group) -
 124                         ext2fs_block_bitmap_loc(fs, group - 1) -
 125                         fs->super->s_blocks_per_group;
 126                 i_stride = ext2fs_inode_bitmap_loc(fs, group) -
 127                         ext2fs_inode_bitmap_loc(fs, group - 1) -
 128                         fs->super->s_blocks_per_group;
 129                 if (b_stride != i_stride ||
 130                     b_stride < 0 ||
 131                     (flexbg_size > 1 && (group % flexbg_size == 0)))
 132                         goto next;
 133
 134                 /* printf("group %d has stride %d\n", group, b_stride); */
 135                 sum += b_stride;
 136                 num++;
 137
 138         next:
 139                 prev_has_sb = has_sb;
 140         }
 141
 142         if (fs->group_desc_count > 12 && num < 3)
 143                 sum = 0;
 144
 145         if (num)
 146                 fs->stride = sum / num;
 147         else
 148                 fs->stride = 0;
 149
 150         fs->super->s_raid_stride = fs->stride;
 151         ext2fs_mark_super_dirty(fs);
 152
 153 #if 0
 154         if (fs->stride)
 155                 printf("Using RAID stride of %d\n", fs->stride);
 156 #endif
 157 }
 158
 159 static void bigalloc_check(ext2_filsys fs, int force)
 160 {
 161         if (!force && ext2fs_has_feature_bigalloc(fs->super)) {
 162                 fprintf(stderr, "%s", _("\nResizing bigalloc file systems has "
 163                                         "not been fully tested.  Proceed at\n"
 164                                         "your own risk!  Use the force option "
 165                                         "if you want to go ahead anyway.\n\n"));
 166                 exit(1);
 167         }
 168 }
 169
 170 static int resize2fs_setup_tdb(const char *device, char *undo_file,
 171                                io_manager *io_ptr)
 172 {
 173         errcode_t retval = ENOMEM;
 174         const char *tdb_dir = NULL;
 175         char *tdb_file = NULL;
 176         char *dev_name, *tmp_name;
 177
 178         /* (re)open a specific undo file */
 179         if (undo_file && undo_file[0] != 0) {
 180                 retval = set_undo_io_backing_manager(*io_ptr);
 181                 if (retval)
 182                         goto err;
 183                 *io_ptr = undo_io_manager;
 184                 retval = set_undo_io_backup_file(undo_file);
 185                 if (retval)
 186                         goto err;
 187                 printf(_("Overwriting existing filesystem; this can be undone "
 188                          "using the command:\n"
 189                          "    e2undo %s %s\n\n"),
 190                         undo_file, device);
 191                 return retval;
 192         }
 193
 194         /*
 195          * Configuration via a conf file would be
 196          * nice
 197          */
 198         tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
 199         if (!tdb_dir)
 200                 tdb_dir = "/var/lib/e2fsprogs";
 201
 202         if (!strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
 203             access(tdb_dir, W_OK))
 204                 return 0;
 205
 206         tmp_name = strdup(device);
 207         if (!tmp_name)
 208                 goto errout;
 209         dev_name = basename(tmp_name);
 210         tdb_file = malloc(strlen(tdb_dir) + 11 + strlen(dev_name) + 7 + 1);
 211         if (!tdb_file) {
 212                 free(tmp_name);
 213                 goto errout;
 214         }
 215         sprintf(tdb_file, "%s/resize2fs-%s.e2undo", tdb_dir, dev_name);
 216         free(tmp_name);
 217
 218         if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
 219                 retval = errno;
 220                 com_err(program_name, retval,
 221                         _("while trying to delete %s"), tdb_file);
 222                 goto errout;
 223         }
 224
 225         retval = set_undo_io_backing_manager(*io_ptr);
 226         if (retval)
 227                 goto errout;
 228         *io_ptr = undo_io_manager;
 229         retval = set_undo_io_backup_file(tdb_file);
 230         if (retval)
 231                 goto errout;
 232         printf(_("Overwriting existing filesystem; this can be undone "
 233                  "using the command:\n"
 234                  "    e2undo %s %s\n\n"), tdb_file, device);
 235
 236         free(tdb_file);
 237         return 0;
 238 errout:
 239         free(tdb_file);
 240 err:
 241         com_err(program_name, retval, "%s",
 242                 _("while trying to setup undo file\n"));
 243         return retval;
 244 }
 245
 246 int main (int argc, char ** argv)
 247 {
 248         errcode_t       retval;
 249         ext2_filsys     fs;
 250         int             c;
 251         int             flags = 0;
 252         int             flush = 0;
 253         int             force = 0;
 254         int             io_flags = 0;
 255         int             force_min_size = 0;
 256         int             print_min_size = 0;
 257         int             fd, ret;
 258         blk64_t         new_size = 0;
 259         blk64_t         max_size = 0;
 260         blk64_t         min_size = 0;
 261         io_manager      io_ptr;
 262         char            *new_size_str = 0;
 263         int             use_stride = -1;
 264         ext2fs_struct_stat st_buf;
 265         __s64           new_file_size;
 266         unsigned int    sys_page_size = 4096;
 267         unsigned int    blocksize;
 268         long            sysval;
 269         int             len, mount_flags;
 270         char            *mtpt, *undo_file = NULL;
 271
 272 #ifdef ENABLE_NLS
 273         setlocale(LC_MESSAGES, "");
 274         setlocale(LC_CTYPE, "");
 275         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 276         textdomain(NLS_CAT_NAME);
 277         set_com_err_gettext(gettext);
 278 #endif
 279
 280         add_error_table(&et_ext2_error_table);
 281
 282         fprintf (stderr, "resize2fs %s (%s)\n",
 283                  E2FSPROGS_VERSION, E2FSPROGS_DATE);
 284         if (argc && *argv)
 285                 program_name = *argv;
 286
 287         while ((c = getopt(argc, argv, "d:fFhMPpS:bsz:")) != EOF) {
 288                 switch (c) {
 289                 case 'h':
 290                         usage(program_name);
 291                         break;
 292                 case 'f':
 293                         force = 1;
 294                         break;
 295                 case 'F':
 296                         flush = 1;
 297                         break;
 298                 case 'M':
 299                         force_min_size = 1;
 300                         break;
 301                 case 'P':
 302                         print_min_size = 1;
 303                         break;
 304                 case 'd':
 305                         flags |= atoi(optarg);
 306                         break;
 307                 case 'p':
 308                         flags |= RESIZE_PERCENT_COMPLETE;
 309                         break;
 310                 case 'S':
 311                         use_stride = atoi(optarg);
 312                         break;
 313                 case 'b':
 314                         flags |= RESIZE_ENABLE_64BIT;
 315                         break;
 316                 case 's':
 317                         flags |= RESIZE_DISABLE_64BIT;
 318                         break;
 319                 case 'z':
 320                         undo_file = optarg;
 321                         break;
 322                 default:
 323                         usage(program_name);
 324                 }
 325         }
 326         if (optind == argc)
 327                 usage(program_name);
 328
 329         device_name = argv[optind++];
 330         if (optind < argc)
 331                 new_size_str = argv[optind++];
 332         if (optind < argc)
 333                 usage(program_name);
 334
 335         io_options = strchr(device_name, '?');
 336         if (io_options)
 337                 *io_options++ = 0;
 338
 339         /*
 340          * Figure out whether or not the device is mounted, and if it is
 341          * where it is mounted.
 342          */
 343         len=80;
 344         while (1) {
 345                 mtpt = malloc(len);
 346                 if (!mtpt)
 347                         return ENOMEM;
 348                 mtpt[len-1] = 0;
 349                 retval = ext2fs_check_mount_point(device_name, &mount_flags,
 350                                                   mtpt, len);
 351                 if (retval) {
 352                         com_err("ext2fs_check_mount_point", retval,
 353                                 _("while determining whether %s is mounted."),
 354                                 device_name);
 355                         exit(1);
 356                 }
 357                 if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
 358                         break;
 359                 free(mtpt);
 360                 len = 2 * len;
 361         }
 362
 363         fd = ext2fs_open_file(device_name, O_RDWR, 0);
 364         if (fd < 0) {
 365                 com_err("open", errno, _("while opening %s"),
 366                         device_name);
 367                 exit(1);
 368         }
 369
 370         ret = ext2fs_fstat(fd, &st_buf);
 371         if (ret < 0) {
 372                 com_err("open", errno,
 373                         _("while getting stat information for %s"),
 374                         device_name);
 375                 exit(1);
 376         }
 377
 378         if (flush) {
 379                 retval = ext2fs_sync_device(fd, 1);
 380                 if (retval) {
 381                         com_err(argv[0], retval,
 382                                 _("while trying to flush %s"),
 383                                 device_name);
 384                         exit(1);
 385                 }
 386         }
 387
 388         if (!S_ISREG(st_buf.st_mode )) {
 389                 close(fd);
 390                 fd = -1;
 391         }
 392
 393 #ifdef CONFIG_TESTIO_DEBUG
 394         if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
 395                 io_ptr = test_io_manager;
 396                 test_io_backing_manager = unix_io_manager;
 397         } else
 398 #endif
 399                 io_ptr = unix_io_manager;
 400
 401         if (!(mount_flags & EXT2_MF_MOUNTED))
 402                 io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
 403
 404         io_flags |= EXT2_FLAG_64BITS;
 405         if (undo_file) {
 406                 retval = resize2fs_setup_tdb(device_name, undo_file, &io_ptr);
 407                 if (retval)
 408                         exit(1);
 409         }
 410         retval = ext2fs_open2(device_name, io_options, io_flags,
 411                               0, 0, io_ptr, &fs);
 412         if (retval) {
 413                 com_err(program_name, retval, _("while trying to open %s"),
 414                         device_name);
 415                 printf("%s", _("Couldn't find valid filesystem superblock.\n"));
 416                 exit (1);
 417         }
 418         fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
 419
 420         /*
 421          * Before acting on an unmounted filesystem, make sure it's ok,
 422          * unless the user is forcing it.
 423          *
 424          * We do ERROR and VALID checks even if we're only printing the
 425          * minimimum size, because traversal of a badly damaged filesystem
 426          * can cause issues as well.  We don't require it to be fscked after
 427          * the last mount time in this case, though, as this is a bit less
 428          * risky.
 429          */
 430         if (!force && !(mount_flags & EXT2_MF_MOUNTED)) {
 431                 int checkit = 0;
 432
 433                 if (fs->super->s_state & EXT2_ERROR_FS)
 434                         checkit = 1;
 435
 436                 if ((fs->super->s_state & EXT2_VALID_FS) == 0)
 437                         checkit = 1;
 438
 439                 if ((fs->super->s_lastcheck < fs->super->s_mtime) &&
 440                     !print_min_size)
 441                         checkit = 1;
 442
 443                 if (checkit) {
 444                         fprintf(stderr,
 445                                 _("Please run 'e2fsck -f %s' first.\n\n"),
 446                                 device_name);
 447                         exit(1);
 448                 }
 449         }
 450
 451         /*
 452          * Check for compatibility with the feature sets.  We need to
 453          * be more stringent than ext2fs_open().
 454          */
 455         if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
 456                 com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
 457                         "(%s)", device_name);
 458                 exit(1);
 459         }
 460
 461         min_size = calculate_minimum_resize_size(fs, flags);
 462
 463         if (print_min_size) {
 464                 printf(_("Estimated minimum size of the filesystem: %llu\n"),
 465                        min_size);
 466                 exit(0);
 467         }
 468
 469         /* Determine the system page size if possible */
 470 #ifdef HAVE_SYSCONF
 471 #if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
 472 #define _SC_PAGESIZE _SC_PAGE_SIZE
 473 #endif
 474 #ifdef _SC_PAGESIZE
 475         sysval = sysconf(_SC_PAGESIZE);
 476         if (sysval > 0)
 477                 sys_page_size = sysval;
 478 #endif /* _SC_PAGESIZE */
 479 #endif /* HAVE_SYSCONF */
 480
 481         /*
 482          * Get the size of the containing partition, and use this for
 483          * defaults and for making sure the new filesystem doesn't
 484          * exceed the partition size.
 485          */
 486         blocksize = fs->blocksize;
 487         retval = ext2fs_get_device_size2(device_name, blocksize,
 488                                          &max_size);
 489         if (retval) {
 490                 com_err(program_name, retval, "%s",
 491                         _("while trying to determine filesystem size"));
 492                 exit(1);
 493         }
 494         if (force_min_size)
 495                 new_size = min_size;
 496         else if (new_size_str) {
 497                 new_size = parse_num_blocks2(new_size_str,
 498                                              fs->super->s_log_block_size);
 499                 if (new_size == 0) {
 500                         com_err(program_name, 0,
 501                                 _("Invalid new size: %s\n"), new_size_str);
 502                         exit(1);
 503                 }
 504         } else {
 505                 new_size = max_size;
 506                 /* Round down to an even multiple of a pagesize */
 507                 if (sys_page_size > blocksize)
 508                         new_size &= ~((blk64_t)((sys_page_size / blocksize)-1));
 509         }
 510         /* If changing 64bit, don't change the filesystem size. */
 511         if (flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)) {
 512                 new_size = ext2fs_blocks_count(fs->super);
 513         }
 514         if (!ext2fs_has_feature_64bit(fs->super)) {
 515                 /* Take 16T down to 2^32-1 blocks */
 516                 if (new_size == (1ULL << 32))
 517                         new_size--;
 518                 else if (new_size > (1ULL << 32)) {
 519                         com_err(program_name, 0, "%s",
 520                                 _("New size too large to be "
 521                                   "expressed in 32 bits\n"));
 522                         exit(1);
 523                 }
 524         }
 525
 526         if (!force && new_size < min_size) {
 527                 com_err(program_name, 0,
 528                         _("New size smaller than minimum (%llu)\n"), min_size);
 529                 exit(1);
 530         }
 531         if (use_stride >= 0) {
 532                 if (use_stride >= (int) fs->super->s_blocks_per_group) {
 533                         com_err(program_name, 0, "%s",
 534                                 _("Invalid stride length"));
 535                         exit(1);
 536                 }
 537                 fs->stride = fs->super->s_raid_stride = use_stride;
 538                 ext2fs_mark_super_dirty(fs);
 539         } else
 540                   determine_fs_stride(fs);
 541
 542         /*
 543          * If we are resizing a plain file, and it's not big enough,
 544          * automatically extend it in a sparse fashion by writing the
 545          * last requested block.
 546          */
 547         new_file_size = ((__u64) new_size) * blocksize;
 548         if ((__u64) new_file_size >
 549             (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
 550                 fd = -1;
 551         if ((new_file_size > st_buf.st_size) &&
 552             (fd > 0)) {
 553                 if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
 554                     (write(fd, "0", 1) == 1))
 555                         max_size = new_size;
 556         }
 557         if (!force && (new_size > max_size)) {
 558                 fprintf(stderr, _("The containing partition (or device)"
 559                         " is only %llu (%dk) blocks.\nYou requested a new size"
 560                         " of %llu blocks.\n\n"), max_size,
 561                         blocksize / 1024, new_size);
 562                 exit(1);
 563         }
 564         if ((flags & RESIZE_DISABLE_64BIT) && (flags & RESIZE_ENABLE_64BIT)) {
 565                 fprintf(stderr, _("Cannot set and unset 64bit feature.\n"));
 566                 exit(1);
 567         } else if (flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)) {
 568                 if (new_size >= (1ULL << 32)) {
 569                         fprintf(stderr, _("Cannot change the 64bit feature "
 570                                 "on a filesystem that is larger than "
 571                                 "2^32 blocks.\n"));
 572                         exit(1);
 573                 }
 574                 if (mount_flags & EXT2_MF_MOUNTED) {
 575                         fprintf(stderr, _("Cannot change the 64bit feature "
 576                                 "while the filesystem is mounted.\n"));
 577                         exit(1);
 578                 }
 579                 if (flags & RESIZE_ENABLE_64BIT &&
 580                     !ext2fs_has_feature_extents(fs->super)) {
 581                         fprintf(stderr, _("Please enable the extents feature "
 582                                 "with tune2fs before enabling the 64bit "
 583                                 "feature.\n"));
 584                         exit(1);
 585                 }
 586         } else if (new_size == ext2fs_blocks_count(fs->super)) {
 587                 fprintf(stderr, _("The filesystem is already %llu (%dk) "
 588                         "blocks long.  Nothing to do!\n\n"), new_size,
 589                         blocksize / 1024);
 590                 exit(0);
 591         }
 592         if ((flags & RESIZE_ENABLE_64BIT) &&
 593             ext2fs_has_feature_64bit(fs->super)) {
 594                 fprintf(stderr, _("The filesystem is already 64-bit.\n"));
 595                 exit(0);
 596         }
 597         if ((flags & RESIZE_DISABLE_64BIT) &&
 598             !ext2fs_has_feature_64bit(fs->super)) {
 599                 fprintf(stderr, _("The filesystem is already 32-bit.\n"));
 600                 exit(0);
 601         }
 602         if (mount_flags & EXT2_MF_MOUNTED) {
 603                 bigalloc_check(fs, force);
 604                 retval = online_resize_fs(fs, mtpt, &new_size, flags);
 605         } else {
 606                 bigalloc_check(fs, force);
 607                 if (flags & RESIZE_ENABLE_64BIT)
 608                         printf(_("Converting the filesystem to 64-bit.\n"));
 609                 else if (flags & RESIZE_DISABLE_64BIT)
 610                         printf(_("Converting the filesystem to 32-bit.\n"));
 611                 else
 612                         printf(_("Resizing the filesystem on "
 613                                  "%s to %llu (%dk) blocks.\n"),
 614                                device_name, new_size, blocksize / 1024);
 615                 retval = resize_fs(fs, &new_size, flags,
 616                                    ((flags & RESIZE_PERCENT_COMPLETE) ?
 617                                     resize_progress_func : 0));
 618         }
 619         free(mtpt);
 620         if (retval) {
 621                 com_err(program_name, retval, _("while trying to resize %s"),
 622                         device_name);
 623                 fprintf(stderr,
 624                         _("Please run 'e2fsck -fy %s' to fix the filesystem\n"
 625                           "after the aborted resize operation.\n"),
 626                         device_name);
 627                 ext2fs_close_free(&fs);
 628                 exit(1);
 629         }
 630         printf(_("The filesystem on %s is now %llu (%dk) blocks long.\n\n"),
 631                device_name, new_size, blocksize / 1024);
 632
 633         if ((st_buf.st_size > new_file_size) &&
 634             (fd > 0)) {
 635 #ifdef HAVE_FTRUNCATE64
 636                 retval = ftruncate64(fd, new_file_size);
 637 #else
 638                 retval = 0;
 639                 /* Only truncate if new_file_size doesn't overflow off_t */
 640                 if (((off_t) new_file_size) == new_file_size)
 641                         retval = ftruncate(fd, (off_t) new_file_size);
 642 #endif
 643                 if (retval)
 644                         com_err(program_name, retval,
 645                                 _("while trying to truncate %s"),
 646                                 device_name);
 647         }
 648         if (fd > 0)
 649                 close(fd);
 650         remove_error_table(&et_ext2_error_table);
 651         return (0);
 652 }