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 #define _LARGEFILE_SOURCE
  16 #define _LARGEFILE64_SOURCE
  17
  18 #include "config.h"
  19 #ifdef HAVE_GETOPT_H
  20 #include <getopt.h>
  21 #else
  22 extern char *optarg;
  23 extern int optind;
  24 #endif
  25 #include <unistd.h>
  26 #ifdef HAVE_STDLIB_H
  27 #include <stdlib.h>
  28 #endif
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32
  33 #include "e2p/e2p.h"
  34
  35 #include "resize2fs.h"
  36
  37 #include "../version.h"
  38
  39 char *program_name, *device_name, *io_options;
  40
  41 static void usage (char *prog)
  42 {
  43         fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
  44                            "[-p] device [new_size]\n\n"), prog);
  45
  46         exit (1);
  47 }
  48
  49 static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
  50                                       unsigned long cur, unsigned long max)
  51 {
  52         ext2_sim_progmeter progress;
  53         const char      *label;
  54         errcode_t       retval;
  55
  56         progress = (ext2_sim_progmeter) rfs->prog_data;
  57         if (max == 0)
  58                 return 0;
  59         if (cur == 0) {
  60                 if (progress)
  61                         ext2fs_progress_close(progress);
  62                 progress = 0;
  63                 switch (pass) {
  64                 case E2_RSZ_EXTEND_ITABLE_PASS:
  65                         label = _("Extending the inode table");
  66                         break;
  67                 case E2_RSZ_BLOCK_RELOC_PASS:
  68                         label = _("Relocating blocks");
  69                         break;
  70                 case E2_RSZ_INODE_SCAN_PASS:
  71                         label = _("Scanning inode table");
  72                         break;
  73                 case E2_RSZ_INODE_REF_UPD_PASS:
  74                         label = _("Updating inode references");
  75                         break;
  76                 case E2_RSZ_MOVE_ITABLE_PASS:
  77                         label = _("Moving inode table");
  78                         break;
  79                 default:
  80                         label = _("Unknown pass?!?");
  81                         break;
  82                 }
  83                 printf(_("Begin pass %d (max = %lu)\n"), pass, max);
  84                 retval = ext2fs_progress_init(&progress, label, 30,
  85                                               40, max, 0);
  86                 if (retval)
  87                         progress = 0;
  88                 rfs->prog_data = (void *) progress;
  89         }
  90         if (progress)
  91                 ext2fs_progress_update(progress, cur);
  92         if (cur >= max) {
  93                 if (progress)
  94                         ext2fs_progress_close(progress);
  95                 progress = 0;
  96                 rfs->prog_data = 0;
  97         }
  98         return 0;
  99 }
 100
 101 static void determine_fs_stride(ext2_filsys fs)
 102 {
 103         unsigned int    group;
 104         unsigned long long sum;
 105         unsigned int    has_sb, prev_has_sb = 0, num;
 106         int             i_stride, b_stride;
 107
 108         if (fs->stride)
 109                 return;
 110         num = 0; sum = 0;
 111         for (group = 0; group < fs->group_desc_count; group++) {
 112                 has_sb = ext2fs_bg_has_super(fs, group);
 113                 if (group == 0 || has_sb != prev_has_sb)
 114                         goto next;
 115                 b_stride = ext2fs_block_bitmap_loc(fs, group) -
 116                         ext2fs_block_bitmap_loc(fs, group - 1) -
 117                         fs->super->s_blocks_per_group;
 118                 i_stride = ext2fs_inode_bitmap_loc(fs, group) -
 119                         ext2fs_inode_bitmap_loc(fs, group - 1) -
 120                         fs->super->s_blocks_per_group;
 121                 if (b_stride != i_stride ||
 122                     b_stride < 0)
 123                         goto next;
 124
 125                 /* printf("group %d has stride %d\n", group, b_stride); */
 126                 sum += b_stride;
 127                 num++;
 128
 129         next:
 130                 prev_has_sb = has_sb;
 131         }
 132
 133         if (fs->group_desc_count > 12 && num < 3)
 134                 sum = 0;
 135
 136         if (num)
 137                 fs->stride = sum / num;
 138         else
 139                 fs->stride = 0;
 140
 141         fs->super->s_raid_stride = fs->stride;
 142         ext2fs_mark_super_dirty(fs);
 143
 144 #if 0
 145         if (fs->stride)
 146                 printf("Using RAID stride of %d\n", fs->stride);
 147 #endif
 148 }
 149
 150 static void bigalloc_check(ext2_filsys fs, int force)
 151 {
 152         if (!force && EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 153                                 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 154                 fprintf(stderr, "%s", _("\nResizing bigalloc file systems has "
 155                                         "not been fully tested.  Proceed at\n"
 156                                         "your own risk!  Use the force option "
 157                                         "if you want to go ahead anyway.\n\n"));
 158                 exit(1);
 159         }
 160 }
 161
 162 int main (int argc, char ** argv)
 163 {
 164         errcode_t       retval;
 165         ext2_filsys     fs;
 166         int             c;
 167         int             flags = 0;
 168         int             flush = 0;
 169         int             force = 0;
 170         int             io_flags = 0;
 171         int             force_min_size = 0;
 172         int             print_min_size = 0;
 173         int             fd, ret;
 174         blk64_t         new_size = 0;
 175         blk64_t         max_size = 0;
 176         blk64_t         min_size = 0;
 177         io_manager      io_ptr;
 178         char            *new_size_str = 0;
 179         int             use_stride = -1;
 180         ext2fs_struct_stat st_buf;
 181         __s64           new_file_size;
 182         unsigned int    sys_page_size = 4096;
 183         long            sysval;
 184         int             len, mount_flags;
 185         char            *mtpt;
 186
 187 #ifdef ENABLE_NLS
 188         setlocale(LC_MESSAGES, "");
 189         setlocale(LC_CTYPE, "");
 190         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 191         textdomain(NLS_CAT_NAME);
 192         set_com_err_gettext(gettext);
 193 #endif
 194
 195         add_error_table(&et_ext2_error_table);
 196
 197         fprintf (stderr, "resize2fs %s (%s)\n",
 198                  E2FSPROGS_VERSION, E2FSPROGS_DATE);
 199         if (argc && *argv)
 200                 program_name = *argv;
 201
 202         while ((c = getopt (argc, argv, "d:fFhMPpS:")) != EOF) {
 203                 switch (c) {
 204                 case 'h':
 205                         usage(program_name);
 206                         break;
 207                 case 'f':
 208                         force = 1;
 209                         break;
 210                 case 'F':
 211                         flush = 1;
 212                         break;
 213                 case 'M':
 214                         force_min_size = 1;
 215                         break;
 216                 case 'P':
 217                         print_min_size = 1;
 218                         break;
 219                 case 'd':
 220                         flags |= atoi(optarg);
 221                         break;
 222                 case 'p':
 223                         flags |= RESIZE_PERCENT_COMPLETE;
 224                         break;
 225                 case 'S':
 226                         use_stride = atoi(optarg);
 227                         break;
 228                 default:
 229                         usage(program_name);
 230                 }
 231         }
 232         if (optind == argc)
 233                 usage(program_name);
 234
 235         device_name = argv[optind++];
 236         if (optind < argc)
 237                 new_size_str = argv[optind++];
 238         if (optind < argc)
 239                 usage(program_name);
 240
 241         io_options = strchr(device_name, '?');
 242         if (io_options)
 243                 *io_options++ = 0;
 244
 245         /*
 246          * Figure out whether or not the device is mounted, and if it is
 247          * where it is mounted.
 248          */
 249         len=80;
 250         while (1) {
 251                 mtpt = malloc(len);
 252                 if (!mtpt)
 253                         return ENOMEM;
 254                 mtpt[len-1] = 0;
 255                 retval = ext2fs_check_mount_point(device_name, &mount_flags,
 256                                                   mtpt, len);
 257                 if (retval) {
 258                         com_err("ext2fs_check_mount_point", retval,
 259                                 _("while determining whether %s is mounted."),
 260                                 device_name);
 261                         exit(1);
 262                 }
 263                 if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
 264                         break;
 265                 free(mtpt);
 266                 len = 2 * len;
 267         }
 268
 269         fd = ext2fs_open_file(device_name, O_RDWR, 0);
 270         if (fd < 0) {
 271                 com_err("open", errno, _("while opening %s"),
 272                         device_name);
 273                 exit(1);
 274         }
 275
 276         ret = ext2fs_fstat(fd, &st_buf);
 277         if (ret < 0) {
 278                 com_err("open", errno,
 279                         _("while getting stat information for %s"),
 280                         device_name);
 281                 exit(1);
 282         }
 283
 284         if (flush) {
 285                 retval = ext2fs_sync_device(fd, 1);
 286                 if (retval) {
 287                         com_err(argv[0], retval,
 288                                 _("while trying to flush %s"),
 289                                 device_name);
 290                         exit(1);
 291                 }
 292         }
 293
 294         if (!S_ISREG(st_buf.st_mode )) {
 295                 close(fd);
 296                 fd = -1;
 297         }
 298
 299 #ifdef CONFIG_TESTIO_DEBUG
 300         if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
 301                 io_ptr = test_io_manager;
 302                 test_io_backing_manager = unix_io_manager;
 303         } else
 304 #endif
 305                 io_ptr = unix_io_manager;
 306
 307         if (!(mount_flags & EXT2_MF_MOUNTED))
 308                 io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
 309
 310         io_flags |= EXT2_FLAG_64BITS;
 311
 312         retval = ext2fs_open2(device_name, io_options, io_flags,
 313                               0, 0, io_ptr, &fs);
 314         if (retval) {
 315                 com_err(program_name, retval, _("while trying to open %s"),
 316                         device_name);
 317                 printf("%s", _("Couldn't find valid filesystem superblock.\n"));
 318                 exit (1);
 319         }
 320
 321         /*
 322          * Check for compatibility with the feature sets.  We need to
 323          * be more stringent than ext2fs_open().
 324          */
 325         if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
 326                 com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
 327                         "(%s)", device_name);
 328                 exit(1);
 329         }
 330
 331         min_size = calculate_minimum_resize_size(fs, flags);
 332
 333         if (print_min_size) {
 334                 if (!force && ((fs->super->s_state & EXT2_ERROR_FS) ||
 335                                ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
 336                         fprintf(stderr,
 337                                 _("Please run 'e2fsck -f %s' first.\n\n"),
 338                                 device_name);
 339                         exit(1);
 340                 }
 341                 printf(_("Estimated minimum size of the filesystem: %llu\n"),
 342                        min_size);
 343                 exit(0);
 344         }
 345
 346         /* Determine the system page size if possible */
 347 #ifdef HAVE_SYSCONF
 348 #if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
 349 #define _SC_PAGESIZE _SC_PAGE_SIZE
 350 #endif
 351 #ifdef _SC_PAGESIZE
 352         sysval = sysconf(_SC_PAGESIZE);
 353         if (sysval > 0)
 354                 sys_page_size = sysval;
 355 #endif /* _SC_PAGESIZE */
 356 #endif /* HAVE_SYSCONF */
 357
 358         /*
 359          * Get the size of the containing partition, and use this for
 360          * defaults and for making sure the new filesystem doesn't
 361          * exceed the partition size.
 362          */
 363         retval = ext2fs_get_device_size2(device_name, fs->blocksize,
 364                                          &max_size);
 365         if (retval) {
 366                 com_err(program_name, retval, "%s",
 367                         _("while trying to determine filesystem size"));
 368                 exit(1);
 369         }
 370         if (force_min_size)
 371                 new_size = min_size;
 372         else if (new_size_str) {
 373                 new_size = parse_num_blocks2(new_size_str,
 374                                              fs->super->s_log_block_size);
 375                 if (new_size == 0) {
 376                         com_err(program_name, 0,
 377                                 _("Invalid new size: %s\n"), new_size_str);
 378                         exit(1);
 379                 }
 380         } else {
 381                 new_size = max_size;
 382                 /* Round down to an even multiple of a pagesize */
 383                 if (sys_page_size > fs->blocksize)
 384                         new_size &= ~((sys_page_size / fs->blocksize)-1);
 385         }
 386         if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super,
 387                                        EXT4_FEATURE_INCOMPAT_64BIT)) {
 388                 /* Take 16T down to 2^32-1 blocks */
 389                 if (new_size == (1ULL << 32))
 390                         new_size--;
 391                 else if (new_size > (1ULL << 32)) {
 392                         com_err(program_name, 0, "%s",
 393                                 _("New size too large to be "
 394                                   "expressed in 32 bits\n"));
 395                         exit(1);
 396                 }
 397         }
 398
 399         if (!force && new_size < min_size) {
 400                 com_err(program_name, 0,
 401                         _("New size smaller than minimum (%llu)\n"), min_size);
 402                 exit(1);
 403         }
 404         if (use_stride >= 0) {
 405                 if (use_stride >= (int) fs->super->s_blocks_per_group) {
 406                         com_err(program_name, 0, "%s",
 407                                 _("Invalid stride length"));
 408                         exit(1);
 409                 }
 410                 fs->stride = fs->super->s_raid_stride = use_stride;
 411                 ext2fs_mark_super_dirty(fs);
 412         } else
 413                   determine_fs_stride(fs);
 414
 415         /*
 416          * If we are resizing a plain file, and it's not big enough,
 417          * automatically extend it in a sparse fashion by writing the
 418          * last requested block.
 419          */
 420         new_file_size = ((__u64) new_size) * fs->blocksize;
 421         if ((__u64) new_file_size >
 422             (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
 423                 fd = -1;
 424         if ((new_file_size > st_buf.st_size) &&
 425             (fd > 0)) {
 426                 if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
 427                     (write(fd, "0", 1) == 1))
 428                         max_size = new_size;
 429         }
 430         if (!force && (new_size > max_size)) {
 431                 fprintf(stderr, _("The containing partition (or device)"
 432                         " is only %llu (%dk) blocks.\nYou requested a new size"
 433                         " of %llu blocks.\n\n"), max_size,
 434                         fs->blocksize / 1024, new_size);
 435                 exit(1);
 436         }
 437         if (new_size == ext2fs_blocks_count(fs->super)) {
 438                 fprintf(stderr, _("The filesystem is already %llu blocks "
 439                         "long.  Nothing to do!\n\n"), new_size);
 440                 exit(0);
 441         }
 442         if (mount_flags & EXT2_MF_MOUNTED) {
 443                 bigalloc_check(fs, force);
 444                 retval = online_resize_fs(fs, mtpt, &new_size, flags);
 445         } else {
 446                 if (!force && ((fs->super->s_lastcheck < fs->super->s_mtime) ||
 447                                (fs->super->s_state & EXT2_ERROR_FS) ||
 448                                ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
 449                         fprintf(stderr,
 450                                 _("Please run 'e2fsck -f %s' first.\n\n"),
 451                                 device_name);
 452                         exit(1);
 453                 }
 454                 bigalloc_check(fs, force);
 455                 printf(_("Resizing the filesystem on "
 456                          "%s to %llu (%dk) blocks.\n"),
 457                        device_name, new_size, fs->blocksize / 1024);
 458                 retval = resize_fs(fs, &new_size, flags,
 459                                    ((flags & RESIZE_PERCENT_COMPLETE) ?
 460                                     resize_progress_func : 0));
 461         }
 462         free(mtpt);
 463         if (retval) {
 464                 com_err(program_name, retval, _("while trying to resize %s"),
 465                         device_name);
 466                 fprintf(stderr,
 467                         _("Please run 'e2fsck -fy %s' to fix the filesystem\n"
 468                           "after the aborted resize operation.\n"),
 469                         device_name);
 470                 ext2fs_close(fs);
 471                 exit(1);
 472         }
 473         printf(_("The filesystem on %s is now %llu blocks long.\n\n"),
 474                device_name, new_size);
 475
 476         if ((st_buf.st_size > new_file_size) &&
 477             (fd > 0)) {
 478 #ifdef HAVE_FTRUNCATE64
 479                 retval = ftruncate64(fd, new_file_size);
 480 #else
 481                 retval = 0;
 482                 /* Only truncate if new_file_size doesn't overflow off_t */
 483                 if (((off_t) new_file_size) == new_file_size)
 484                         retval = ftruncate(fd, (off_t) new_file_size);
 485 #endif
 486                 if (retval)
 487                         com_err(program_name, retval,
 488                                 _("while trying to truncate %s"),
 489                                 device_name);
 490         }
 491         if (fd > 0)
 492                 close(fd);
 493         remove_error_table(&et_ext2_error_table);
 494         return (0);
 495 }