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] [-S RAID-stride] "
  51                            "[-z undo_file]\n\n"),
  52                  prog);
  53
  54         exit (1);
  55 }
  56
  57 static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
  58                                       unsigned long cur, unsigned long max)
  59 {
  60         ext2_sim_progmeter progress;
  61         const char      *label;
  62         errcode_t       retval;
  63
  64         progress = (ext2_sim_progmeter) rfs->prog_data;
  65         if (max == 0)
  66                 return 0;
  67         if (cur == 0) {
  68                 if (progress)
  69                         ext2fs_progress_close(progress);
  70                 progress = 0;
  71                 switch (pass) {
  72                 case E2_RSZ_EXTEND_ITABLE_PASS:
  73                         label = _("Extending the inode table");
  74                         break;
  75                 case E2_RSZ_BLOCK_RELOC_PASS:
  76                         label = _("Relocating blocks");
  77                         break;
  78                 case E2_RSZ_INODE_SCAN_PASS:
  79                         label = _("Scanning inode table");
  80                         break;
  81                 case E2_RSZ_INODE_REF_UPD_PASS:
  82                         label = _("Updating inode references");
  83                         break;
  84                 case E2_RSZ_MOVE_ITABLE_PASS:
  85                         label = _("Moving inode table");
  86                         break;
  87                 default:
  88                         label = _("Unknown pass?!?");
  89                         break;
  90                 }
  91                 printf(_("Begin pass %d (max = %lu)\n"), pass, max);
  92                 retval = ext2fs_progress_init(&progress, label, 30,
  93                                               40, max, 0);
  94                 if (retval)
  95                         progress = 0;
  96                 rfs->prog_data = (void *) progress;
  97         }
  98         if (progress)
  99                 ext2fs_progress_update(progress, cur);
 100         if (cur >= max) {
 101                 if (progress)
 102                         ext2fs_progress_close(progress);
 103                 progress = 0;
 104                 rfs->prog_data = 0;
 105         }
 106         return 0;
 107 }
 108
 109 static void determine_fs_stride(ext2_filsys fs)
 110 {
 111         unsigned int    group;
 112         unsigned long long sum;
 113         unsigned int    has_sb, prev_has_sb = 0, num;
 114         int             i_stride, b_stride;
 115         int             flexbg_size = 1 << fs->super->s_log_groups_per_flex;
 116
 117         if (fs->stride)
 118                 return;
 119         num = 0; sum = 0;
 120         for (group = 0; group < fs->group_desc_count; group++) {
 121                 has_sb = ext2fs_bg_has_super(fs, group);
 122                 if (group == 0 || has_sb != prev_has_sb)
 123                         goto next;
 124                 b_stride = ext2fs_block_bitmap_loc(fs, group) -
 125                         ext2fs_block_bitmap_loc(fs, group - 1) -
 126                         fs->super->s_blocks_per_group;
 127                 i_stride = ext2fs_inode_bitmap_loc(fs, group) -
 128                         ext2fs_inode_bitmap_loc(fs, group - 1) -
 129                         fs->super->s_blocks_per_group;
 130                 if (b_stride != i_stride ||
 131                     b_stride < 0 ||
 132                     (flexbg_size > 1 && (group % flexbg_size == 0)))
 133                         goto next;
 134
 135                 /* printf("group %d has stride %d\n", group, b_stride); */
 136                 sum += b_stride;
 137                 num++;
 138
 139         next:
 140                 prev_has_sb = has_sb;
 141         }
 142
 143         if (fs->group_desc_count > 12 && num < 3)
 144                 sum = 0;
 145
 146         if (num)
 147                 fs->stride = sum / num;
 148         else
 149                 fs->stride = 0;
 150
 151         fs->super->s_raid_stride = fs->stride;
 152         ext2fs_mark_super_dirty(fs);
 153
 154 #if 0
 155         if (fs->stride)
 156                 printf("Using RAID stride of %d\n", fs->stride);
 157 #endif
 158 }
 159
 160 static void bigalloc_check(ext2_filsys fs, int force)
 161 {
 162         if (!force && ext2fs_has_feature_bigalloc(fs->super)) {
 163                 fprintf(stderr, "%s", _("\nResizing bigalloc file systems has "
 164                                         "not been fully tested.  Proceed at\n"
 165                                         "your own risk!  Use the force option "
 166                                         "if you want to go ahead anyway.\n\n"));
 167                 exit(1);
 168         }
 169 }
 170
 171 static int resize2fs_setup_tdb(const char *device, char *undo_file,
 172                                io_manager *io_ptr)
 173 {
 174         errcode_t retval = ENOMEM;
 175         const char *tdb_dir = NULL;
 176         char *tdb_file = NULL;
 177         char *dev_name, *tmp_name;
 178
 179         /* (re)open a specific undo file */
 180         if (undo_file && undo_file[0] != 0) {
 181                 retval = set_undo_io_backing_manager(*io_ptr);
 182                 if (retval)
 183                         goto err;
 184                 *io_ptr = undo_io_manager;
 185                 retval = set_undo_io_backup_file(undo_file);
 186                 if (retval)
 187                         goto err;
 188                 printf(_("Overwriting existing filesystem; this can be undone "
 189                          "using the command:\n"
 190                          "    e2undo %s %s\n\n"),
 191                         undo_file, device);
 192                 return retval;
 193         }
 194
 195         /*
 196          * Configuration via a conf file would be
 197          * nice
 198          */
 199         tdb_dir = getenv("E2FSPROGS_UNDO_DIR");
 200         if (!tdb_dir)
 201                 tdb_dir = "/var/lib/e2fsprogs";
 202
 203         if (!strcmp(tdb_dir, "none") || (tdb_dir[0] == 0) ||
 204             access(tdb_dir, W_OK))
 205                 return 0;
 206
 207         tmp_name = strdup(device);
 208         if (!tmp_name)
 209                 goto errout;
 210         dev_name = basename(tmp_name);
 211         tdb_file = malloc(strlen(tdb_dir) + 11 + strlen(dev_name) + 7 + 1);
 212         if (!tdb_file) {
 213                 free(tmp_name);
 214                 goto errout;
 215         }
 216         sprintf(tdb_file, "%s/resize2fs-%s.e2undo", tdb_dir, dev_name);
 217         free(tmp_name);
 218
 219         if ((unlink(tdb_file) < 0) && (errno != ENOENT)) {
 220                 retval = errno;
 221                 com_err(program_name, retval,
 222                         _("while trying to delete %s"), tdb_file);
 223                 goto errout;
 224         }
 225
 226         retval = set_undo_io_backing_manager(*io_ptr);
 227         if (retval)
 228                 goto errout;
 229         *io_ptr = undo_io_manager;
 230         retval = set_undo_io_backup_file(tdb_file);
 231         if (retval)
 232                 goto errout;
 233         printf(_("Overwriting existing filesystem; this can be undone "
 234                  "using the command:\n"
 235                  "    e2undo %s %s\n\n"), tdb_file, device);
 236
 237         free(tdb_file);
 238         return 0;
 239 errout:
 240         free(tdb_file);
 241 err:
 242         com_err(program_name, retval, "%s",
 243                 _("while trying to setup undo file\n"));
 244         return retval;
 245 }
 246
 247 int main (int argc, char ** argv)
 248 {
 249         errcode_t       retval;
 250         ext2_filsys     fs;
 251         int             c;
 252         int             flags = 0;
 253         int             flush = 0;
 254         int             force = 0;
 255         int             io_flags = 0;
 256         int             force_min_size = 0;
 257         int             print_min_size = 0;
 258         int             fd, ret;
 259         blk64_t         new_size = 0;
 260         blk64_t         max_size = 0;
 261         blk64_t         min_size = 0;
 262         io_manager      io_ptr;
 263         char            *new_size_str = 0;
 264         int             use_stride = -1;
 265         ext2fs_struct_stat st_buf;
 266         __s64           new_file_size;
 267         unsigned int    sys_page_size = 4096;
 268         unsigned int    blocksize;
 269         long            sysval;
 270         int             len, mount_flags;
 271         char            *mtpt, *undo_file = NULL;
 272
 273 #ifdef ENABLE_NLS
 274         setlocale(LC_MESSAGES, "");
 275         setlocale(LC_CTYPE, "");
 276         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 277         textdomain(NLS_CAT_NAME);
 278         set_com_err_gettext(gettext);
 279 #endif
 280
 281         add_error_table(&et_ext2_error_table);
 282
 283         fprintf (stderr, "resize2fs %s (%s)\n",
 284                  E2FSPROGS_VERSION, E2FSPROGS_DATE);
 285         if (argc && *argv)
 286                 program_name = *argv;
 287
 288         while ((c = getopt(argc, argv, "d:fFhMPpS:bsz:")) != EOF) {
 289                 switch (c) {
 290                 case 'h':
 291                         usage(program_name);
 292                         break;
 293                 case 'f':
 294                         force = 1;
 295                         break;
 296                 case 'F':
 297                         flush = 1;
 298                         break;
 299                 case 'M':
 300                         force_min_size = 1;
 301                         break;
 302                 case 'P':
 303                         print_min_size = 1;
 304                         break;
 305                 case 'd':
 306                         flags |= atoi(optarg);
 307                         break;
 308                 case 'p':
 309                         flags |= RESIZE_PERCENT_COMPLETE;
 310                         break;
 311                 case 'S':
 312                         use_stride = atoi(optarg);
 313                         break;
 314                 case 'b':
 315                         flags |= RESIZE_ENABLE_64BIT;
 316                         break;
 317                 case 's':
 318                         flags |= RESIZE_DISABLE_64BIT;
 319                         break;
 320                 case 'z':
 321                         undo_file = optarg;
 322                         break;
 323                 default:
 324                         usage(program_name);
 325                 }
 326         }
 327         if (optind == argc)
 328                 usage(program_name);
 329
 330         device_name = argv[optind++];
 331         if (optind < argc)
 332                 new_size_str = argv[optind++];
 333         if (optind < argc)
 334                 usage(program_name);
 335
 336         io_options = strchr(device_name, '?');
 337         if (io_options)
 338                 *io_options++ = 0;
 339
 340         /*
 341          * Figure out whether or not the device is mounted, and if it is
 342          * where it is mounted.
 343          */
 344         len=80;
 345         while (1) {
 346                 mtpt = malloc(len);
 347                 if (!mtpt)
 348                         return ENOMEM;
 349                 mtpt[len-1] = 0;
 350                 retval = ext2fs_check_mount_point(device_name, &mount_flags,
 351                                                   mtpt, len);
 352                 if (retval) {
 353                         com_err("ext2fs_check_mount_point", retval,
 354                                 _("while determining whether %s is mounted."),
 355                                 device_name);
 356                         exit(1);
 357                 }
 358                 if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
 359                         break;
 360                 free(mtpt);
 361                 len = 2 * len;
 362         }
 363
 364         fd = ext2fs_open_file(device_name, O_RDWR, 0);
 365         if (fd < 0) {
 366                 com_err("open", errno, _("while opening %s"),
 367                         device_name);
 368                 exit(1);
 369         }
 370
 371         ret = ext2fs_fstat(fd, &st_buf);
 372         if (ret < 0) {
 373                 com_err("open", errno,
 374                         _("while getting stat information for %s"),
 375                         device_name);
 376                 exit(1);
 377         }
 378
 379         if (flush) {
 380                 retval = ext2fs_sync_device(fd, 1);
 381                 if (retval) {
 382                         com_err(argv[0], retval,
 383                                 _("while trying to flush %s"),
 384                                 device_name);
 385                         exit(1);
 386                 }
 387         }
 388
 389         if (!S_ISREG(st_buf.st_mode )) {
 390                 close(fd);
 391                 fd = -1;
 392         }
 393
 394 #ifdef CONFIG_TESTIO_DEBUG
 395         if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
 396                 io_ptr = test_io_manager;
 397                 test_io_backing_manager = unix_io_manager;
 398         } else
 399 #endif
 400                 io_ptr = unix_io_manager;
 401
 402         if (!(mount_flags & EXT2_MF_MOUNTED))
 403                 io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
 404
 405         io_flags |= EXT2_FLAG_64BITS;
 406         if (undo_file) {
 407                 retval = resize2fs_setup_tdb(device_name, undo_file, &io_ptr);
 408                 if (retval)
 409                         exit(1);
 410         }
 411         retval = ext2fs_open2(device_name, io_options, io_flags,
 412                               0, 0, io_ptr, &fs);
 413         if (retval) {
 414                 com_err(program_name, retval, _("while trying to open %s"),
 415                         device_name);
 416                 printf("%s", _("Couldn't find valid filesystem superblock.\n"));
 417                 exit (1);
 418         }
 419         fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
 420
 421         /*
 422          * Before acting on an unmounted filesystem, make sure it's ok,
 423          * unless the user is forcing it.
 424          *
 425          * We do ERROR and VALID checks even if we're only printing the
 426          * minimum size, because traversal of a badly damaged filesystem
 427          * can cause issues as well.  We don't require it to be fscked after
 428          * the last mount time in this case, though, as this is a bit less
 429          * risky.
 430          */
 431         if (!force && !(mount_flags & EXT2_MF_MOUNTED)) {
 432                 int checkit = 0;
 433
 434                 if (fs->super->s_state & EXT2_ERROR_FS)
 435                         checkit = 1;
 436
 437                 if ((fs->super->s_state & EXT2_VALID_FS) == 0)
 438                         checkit = 1;
 439
 440                 if ((fs->super->s_lastcheck < fs->super->s_mtime) &&
 441                     !print_min_size)
 442                         checkit = 1;
 443
 444                 if ((ext2fs_free_blocks_count(fs->super) >
 445                      ext2fs_blocks_count(fs->super)) ||
 446                     (fs->super->s_free_inodes_count > fs->super->s_inodes_count))
 447                         checkit = 1;
 448
 449                 if (checkit) {
 450                         fprintf(stderr,
 451                                 _("Please run 'e2fsck -f %s' first.\n\n"),
 452                                 device_name);
 453                         exit(1);
 454                 }
 455         }
 456
 457         /*
 458          * Check for compatibility with the feature sets.  We need to
 459          * be more stringent than ext2fs_open().
 460          */
 461         if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
 462                 com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
 463                         "(%s)", device_name);
 464                 exit(1);
 465         }
 466
 467         min_size = calculate_minimum_resize_size(fs, flags);
 468
 469         if (print_min_size) {
 470                 printf(_("Estimated minimum size of the filesystem: %llu\n"),
 471                        min_size);
 472                 exit(0);
 473         }
 474
 475         /* Determine the system page size if possible */
 476 #ifdef HAVE_SYSCONF
 477 #if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
 478 #define _SC_PAGESIZE _SC_PAGE_SIZE
 479 #endif
 480 #ifdef _SC_PAGESIZE
 481         sysval = sysconf(_SC_PAGESIZE);
 482         if (sysval > 0)
 483                 sys_page_size = sysval;
 484 #endif /* _SC_PAGESIZE */
 485 #endif /* HAVE_SYSCONF */
 486
 487         /*
 488          * Get the size of the containing partition, and use this for
 489          * defaults and for making sure the new filesystem doesn't
 490          * exceed the partition size.
 491          */
 492         blocksize = fs->blocksize;
 493         retval = ext2fs_get_device_size2(device_name, blocksize,
 494                                          &max_size);
 495         if (retval) {
 496                 com_err(program_name, retval, "%s",
 497                         _("while trying to determine filesystem size"));
 498                 exit(1);
 499         }
 500         if (force_min_size)
 501                 new_size = min_size;
 502         else if (new_size_str) {
 503                 new_size = parse_num_blocks2(new_size_str,
 504                                              fs->super->s_log_block_size);
 505                 if (new_size == 0) {
 506                         com_err(program_name, 0,
 507                                 _("Invalid new size: %s\n"), new_size_str);
 508                         exit(1);
 509                 }
 510         } else {
 511                 new_size = max_size;
 512                 /* Round down to an even multiple of a pagesize */
 513                 if (sys_page_size > blocksize)
 514                         new_size &= ~((blk64_t)((sys_page_size / blocksize)-1));
 515         }
 516         /* If changing 64bit, don't change the filesystem size. */
 517         if (flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)) {
 518                 new_size = ext2fs_blocks_count(fs->super);
 519         }
 520         if (!ext2fs_has_feature_64bit(fs->super)) {
 521                 /* Take 16T down to 2^32-1 blocks */
 522                 if (new_size == (1ULL << 32))
 523                         new_size--;
 524                 else if (new_size > (1ULL << 32)) {
 525                         com_err(program_name, 0, "%s",
 526                                 _("New size too large to be "
 527                                   "expressed in 32 bits\n"));
 528                         exit(1);
 529                 }
 530         }
 531
 532         if (!force && new_size < min_size) {
 533                 com_err(program_name, 0,
 534                         _("New size smaller than minimum (%llu)\n"), min_size);
 535                 exit(1);
 536         }
 537         if (use_stride >= 0) {
 538                 if (use_stride >= (int) fs->super->s_blocks_per_group) {
 539                         com_err(program_name, 0, "%s",
 540                                 _("Invalid stride length"));
 541                         exit(1);
 542                 }
 543                 fs->stride = fs->super->s_raid_stride = use_stride;
 544                 ext2fs_mark_super_dirty(fs);
 545         } else
 546                   determine_fs_stride(fs);
 547
 548         /*
 549          * If we are resizing a plain file, and it's not big enough,
 550          * automatically extend it in a sparse fashion by writing the
 551          * last requested block.
 552          */
 553         new_file_size = ((__u64) new_size) * blocksize;
 554         if ((__u64) new_file_size >
 555             (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
 556                 fd = -1;
 557         if ((new_file_size > st_buf.st_size) &&
 558             (fd > 0)) {
 559                 if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
 560                     (write(fd, "0", 1) == 1))
 561                         max_size = new_size;
 562         }
 563         if (!force && (new_size > max_size)) {
 564                 fprintf(stderr, _("The containing partition (or device)"
 565                         " is only %llu (%dk) blocks.\nYou requested a new size"
 566                         " of %llu blocks.\n\n"), max_size,
 567                         blocksize / 1024, new_size);
 568                 exit(1);
 569         }
 570         if ((flags & RESIZE_DISABLE_64BIT) && (flags & RESIZE_ENABLE_64BIT)) {
 571                 fprintf(stderr, _("Cannot set and unset 64bit feature.\n"));
 572                 exit(1);
 573         } else if (flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)) {
 574                 if (new_size >= (1ULL << 32)) {
 575                         fprintf(stderr, _("Cannot change the 64bit feature "
 576                                 "on a filesystem that is larger than "
 577                                 "2^32 blocks.\n"));
 578                         exit(1);
 579                 }
 580                 if (mount_flags & EXT2_MF_MOUNTED) {
 581                         fprintf(stderr, _("Cannot change the 64bit feature "
 582                                 "while the filesystem is mounted.\n"));
 583                         exit(1);
 584                 }
 585                 if (flags & RESIZE_ENABLE_64BIT &&
 586                     !ext2fs_has_feature_extents(fs->super)) {
 587                         fprintf(stderr, _("Please enable the extents feature "
 588                                 "with tune2fs before enabling the 64bit "
 589                                 "feature.\n"));
 590                         exit(1);
 591                 }
 592         } else if (new_size == ext2fs_blocks_count(fs->super)) {
 593                 fprintf(stderr, _("The filesystem is already %llu (%dk) "
 594                         "blocks long.  Nothing to do!\n\n"), new_size,
 595                         blocksize / 1024);
 596                 exit(0);
 597         }
 598         if ((flags & RESIZE_ENABLE_64BIT) &&
 599             ext2fs_has_feature_64bit(fs->super)) {
 600                 fprintf(stderr, _("The filesystem is already 64-bit.\n"));
 601                 exit(0);
 602         }
 603         if ((flags & RESIZE_DISABLE_64BIT) &&
 604             !ext2fs_has_feature_64bit(fs->super)) {
 605                 fprintf(stderr, _("The filesystem is already 32-bit.\n"));
 606                 exit(0);
 607         }
 608         if (mount_flags & EXT2_MF_MOUNTED) {
 609                 retval = online_resize_fs(fs, mtpt, &new_size, flags);
 610         } else {
 611                 bigalloc_check(fs, force);
 612                 if (flags & RESIZE_ENABLE_64BIT)
 613                         printf(_("Converting the filesystem to 64-bit.\n"));
 614                 else if (flags & RESIZE_DISABLE_64BIT)
 615                         printf(_("Converting the filesystem to 32-bit.\n"));
 616                 else
 617                         printf(_("Resizing the filesystem on "
 618                                  "%s to %llu (%dk) blocks.\n"),
 619                                device_name, new_size, blocksize / 1024);
 620                 retval = resize_fs(fs, &new_size, flags,
 621                                    ((flags & RESIZE_PERCENT_COMPLETE) ?
 622                                     resize_progress_func : 0));
 623         }
 624         free(mtpt);
 625         if (retval) {
 626                 com_err(program_name, retval, _("while trying to resize %s"),
 627                         device_name);
 628                 fprintf(stderr,
 629                         _("Please run 'e2fsck -fy %s' to fix the filesystem\n"
 630                           "after the aborted resize operation.\n"),
 631                         device_name);
 632                 ext2fs_close_free(&fs);
 633                 exit(1);
 634         }
 635         printf(_("The filesystem on %s is now %llu (%dk) blocks long.\n\n"),
 636                device_name, new_size, blocksize / 1024);
 637
 638         if ((st_buf.st_size > new_file_size) &&
 639             (fd > 0)) {
 640 #ifdef HAVE_FTRUNCATE64
 641                 retval = ftruncate64(fd, new_file_size);
 642 #else
 643                 retval = 0;
 644                 /* Only truncate if new_file_size doesn't overflow off_t */
 645                 if (((off_t) new_file_size) == new_file_size)
 646                         retval = ftruncate(fd, (off_t) new_file_size);
 647 #endif
 648                 if (retval)
 649                         com_err(program_name, retval,
 650                                 _("while trying to truncate %s"),
 651                                 device_name);
 652         }
 653         if (fd > 0)
 654                 close(fd);
 655         remove_error_table(&et_ext2_error_table);
 656         return (0);
 657 }