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;
  40 static char *device_name, *io_options;
  41
  42 static void usage (char *prog)
  43 {
  44         fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
  45                            "[-p] device [new_size]\n\n"), prog);
  46
  47         exit (1);
  48 }
  49
  50 static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
  51                                       unsigned long cur, unsigned long max)
  52 {
  53         ext2_sim_progmeter progress;
  54         const char      *label;
  55         errcode_t       retval;
  56
  57         progress = (ext2_sim_progmeter) rfs->prog_data;
  58         if (max == 0)
  59                 return 0;
  60         if (cur == 0) {
  61                 if (progress)
  62                         ext2fs_progress_close(progress);
  63                 progress = 0;
  64                 switch (pass) {
  65                 case E2_RSZ_EXTEND_ITABLE_PASS:
  66                         label = _("Extending the inode table");
  67                         break;
  68                 case E2_RSZ_BLOCK_RELOC_PASS:
  69                         label = _("Relocating blocks");
  70                         break;
  71                 case E2_RSZ_INODE_SCAN_PASS:
  72                         label = _("Scanning inode table");
  73                         break;
  74                 case E2_RSZ_INODE_REF_UPD_PASS:
  75                         label = _("Updating inode references");
  76                         break;
  77                 case E2_RSZ_MOVE_ITABLE_PASS:
  78                         label = _("Moving inode table");
  79                         break;
  80                 default:
  81                         label = _("Unknown pass?!?");
  82                         break;
  83                 }
  84                 printf(_("Begin pass %d (max = %lu)\n"), pass, max);
  85                 retval = ext2fs_progress_init(&progress, label, 30,
  86                                               40, max, 0);
  87                 if (retval)
  88                         progress = 0;
  89                 rfs->prog_data = (void *) progress;
  90         }
  91         if (progress)
  92                 ext2fs_progress_update(progress, cur);
  93         if (cur >= max) {
  94                 if (progress)
  95                         ext2fs_progress_close(progress);
  96                 progress = 0;
  97                 rfs->prog_data = 0;
  98         }
  99         return 0;
 100 }
 101
 102 static void determine_fs_stride(ext2_filsys fs)
 103 {
 104         unsigned int    group;
 105         unsigned long long sum;
 106         unsigned int    has_sb, prev_has_sb = 0, num;
 107         int             i_stride, b_stride;
 108
 109         if (fs->stride)
 110                 return;
 111         num = 0; sum = 0;
 112         for (group = 0; group < fs->group_desc_count; group++) {
 113                 has_sb = ext2fs_bg_has_super(fs, group);
 114                 if (group == 0 || has_sb != prev_has_sb)
 115                         goto next;
 116                 b_stride = ext2fs_block_bitmap_loc(fs, group) -
 117                         ext2fs_block_bitmap_loc(fs, group - 1) -
 118                         fs->super->s_blocks_per_group;
 119                 i_stride = ext2fs_inode_bitmap_loc(fs, group) -
 120                         ext2fs_inode_bitmap_loc(fs, group - 1) -
 121                         fs->super->s_blocks_per_group;
 122                 if (b_stride != i_stride ||
 123                     b_stride < 0)
 124                         goto next;
 125
 126                 /* printf("group %d has stride %d\n", group, b_stride); */
 127                 sum += b_stride;
 128                 num++;
 129
 130         next:
 131                 prev_has_sb = has_sb;
 132         }
 133
 134         if (fs->group_desc_count > 12 && num < 3)
 135                 sum = 0;
 136
 137         if (num)
 138                 fs->stride = sum / num;
 139         else
 140                 fs->stride = 0;
 141
 142         fs->super->s_raid_stride = fs->stride;
 143         ext2fs_mark_super_dirty(fs);
 144
 145 #if 0
 146         if (fs->stride)
 147                 printf("Using RAID stride of %d\n", fs->stride);
 148 #endif
 149 }
 150
 151 static void bigalloc_check(ext2_filsys fs, int force)
 152 {
 153         if (!force && EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 154                                 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 155                 fprintf(stderr, "%s", _("\nResizing bigalloc file systems has "
 156                                         "not been fully tested.  Proceed at\n"
 157                                         "your own risk!  Use the force option "
 158                                         "if you want to go ahead anyway.\n\n"));
 159                 exit(1);
 160         }
 161 }
 162
 163 int main (int argc, char ** argv)
 164 {
 165         errcode_t       retval;
 166         ext2_filsys     fs;
 167         int             c;
 168         int             flags = 0;
 169         int             flush = 0;
 170         int             force = 0;
 171         int             io_flags = 0;
 172         int             force_min_size = 0;
 173         int             print_min_size = 0;
 174         int             fd, ret;
 175         blk64_t         new_size = 0;
 176         blk64_t         max_size = 0;
 177         blk64_t         min_size = 0;
 178         io_manager      io_ptr;
 179         char            *new_size_str = 0;
 180         int             use_stride = -1;
 181         ext2fs_struct_stat st_buf;
 182         __s64           new_file_size;
 183         unsigned int    sys_page_size = 4096;
 184         unsigned int    blocksize;
 185         long            sysval;
 186         int             len, mount_flags;
 187         char            *mtpt;
 188
 189 #ifdef ENABLE_NLS
 190         setlocale(LC_MESSAGES, "");
 191         setlocale(LC_CTYPE, "");
 192         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 193         textdomain(NLS_CAT_NAME);
 194         set_com_err_gettext(gettext);
 195 #endif
 196
 197         add_error_table(&et_ext2_error_table);
 198
 199         fprintf (stderr, "resize2fs %s (%s)\n",
 200                  E2FSPROGS_VERSION, E2FSPROGS_DATE);
 201         if (argc && *argv)
 202                 program_name = *argv;
 203
 204         while ((c = getopt (argc, argv, "d:fFhMPpS:")) != EOF) {
 205                 switch (c) {
 206                 case 'h':
 207                         usage(program_name);
 208                         break;
 209                 case 'f':
 210                         force = 1;
 211                         break;
 212                 case 'F':
 213                         flush = 1;
 214                         break;
 215                 case 'M':
 216                         force_min_size = 1;
 217                         break;
 218                 case 'P':
 219                         print_min_size = 1;
 220                         break;
 221                 case 'd':
 222                         flags |= atoi(optarg);
 223                         break;
 224                 case 'p':
 225                         flags |= RESIZE_PERCENT_COMPLETE;
 226                         break;
 227                 case 'S':
 228                         use_stride = atoi(optarg);
 229                         break;
 230                 default:
 231                         usage(program_name);
 232                 }
 233         }
 234         if (optind == argc)
 235                 usage(program_name);
 236
 237         device_name = argv[optind++];
 238         if (optind < argc)
 239                 new_size_str = argv[optind++];
 240         if (optind < argc)
 241                 usage(program_name);
 242
 243         io_options = strchr(device_name, '?');
 244         if (io_options)
 245                 *io_options++ = 0;
 246
 247         /*
 248          * Figure out whether or not the device is mounted, and if it is
 249          * where it is mounted.
 250          */
 251         len=80;
 252         while (1) {
 253                 mtpt = malloc(len);
 254                 if (!mtpt)
 255                         return ENOMEM;
 256                 mtpt[len-1] = 0;
 257                 retval = ext2fs_check_mount_point(device_name, &mount_flags,
 258                                                   mtpt, len);
 259                 if (retval) {
 260                         com_err("ext2fs_check_mount_point", retval,
 261                                 _("while determining whether %s is mounted."),
 262                                 device_name);
 263                         exit(1);
 264                 }
 265                 if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
 266                         break;
 267                 free(mtpt);
 268                 len = 2 * len;
 269         }
 270
 271         fd = ext2fs_open_file(device_name, O_RDWR, 0);
 272         if (fd < 0) {
 273                 com_err("open", errno, _("while opening %s"),
 274                         device_name);
 275                 exit(1);
 276         }
 277
 278         ret = ext2fs_fstat(fd, &st_buf);
 279         if (ret < 0) {
 280                 com_err("open", errno,
 281                         _("while getting stat information for %s"),
 282                         device_name);
 283                 exit(1);
 284         }
 285
 286         if (flush) {
 287                 retval = ext2fs_sync_device(fd, 1);
 288                 if (retval) {
 289                         com_err(argv[0], retval,
 290                                 _("while trying to flush %s"),
 291                                 device_name);
 292                         exit(1);
 293                 }
 294         }
 295
 296         if (!S_ISREG(st_buf.st_mode )) {
 297                 close(fd);
 298                 fd = -1;
 299         }
 300
 301 #ifdef CONFIG_TESTIO_DEBUG
 302         if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
 303                 io_ptr = test_io_manager;
 304                 test_io_backing_manager = unix_io_manager;
 305         } else
 306 #endif
 307                 io_ptr = unix_io_manager;
 308
 309         if (!(mount_flags & EXT2_MF_MOUNTED))
 310                 io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
 311
 312         io_flags |= EXT2_FLAG_64BITS;
 313
 314         retval = ext2fs_open2(device_name, io_options, io_flags,
 315                               0, 0, io_ptr, &fs);
 316         if (retval) {
 317                 com_err(program_name, retval, _("while trying to open %s"),
 318                         device_name);
 319                 printf("%s", _("Couldn't find valid filesystem superblock.\n"));
 320                 exit (1);
 321         }
 322         fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
 323
 324         if (!(mount_flags & EXT2_MF_MOUNTED)) {
 325                 if (!force && ((fs->super->s_lastcheck < fs->super->s_mtime) ||
 326                                (fs->super->s_state & EXT2_ERROR_FS) ||
 327                                ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
 328                         fprintf(stderr,
 329                                 _("Please run 'e2fsck -f %s' first.\n\n"),
 330                                 device_name);
 331                         exit(1);
 332                 }
 333         }
 334
 335         /*
 336          * Check for compatibility with the feature sets.  We need to
 337          * be more stringent than ext2fs_open().
 338          */
 339         if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
 340                 com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
 341                         "(%s)", device_name);
 342                 exit(1);
 343         }
 344
 345         min_size = calculate_minimum_resize_size(fs, flags);
 346
 347         if (print_min_size) {
 348                 printf(_("Estimated minimum size of the filesystem: %llu\n"),
 349                        min_size);
 350                 exit(0);
 351         }
 352
 353         /* Determine the system page size if possible */
 354 #ifdef HAVE_SYSCONF
 355 #if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
 356 #define _SC_PAGESIZE _SC_PAGE_SIZE
 357 #endif
 358 #ifdef _SC_PAGESIZE
 359         sysval = sysconf(_SC_PAGESIZE);
 360         if (sysval > 0)
 361                 sys_page_size = sysval;
 362 #endif /* _SC_PAGESIZE */
 363 #endif /* HAVE_SYSCONF */
 364
 365         /*
 366          * Get the size of the containing partition, and use this for
 367          * defaults and for making sure the new filesystem doesn't
 368          * exceed the partition size.
 369          */
 370         blocksize = fs->blocksize;
 371         retval = ext2fs_get_device_size2(device_name, blocksize,
 372                                          &max_size);
 373         if (retval) {
 374                 com_err(program_name, retval, "%s",
 375                         _("while trying to determine filesystem size"));
 376                 exit(1);
 377         }
 378         if (force_min_size)
 379                 new_size = min_size;
 380         else if (new_size_str) {
 381                 new_size = parse_num_blocks2(new_size_str,
 382                                              fs->super->s_log_block_size);
 383                 if (new_size == 0) {
 384                         com_err(program_name, 0,
 385                                 _("Invalid new size: %s\n"), new_size_str);
 386                         exit(1);
 387                 }
 388         } else {
 389                 new_size = max_size;
 390                 /* Round down to an even multiple of a pagesize */
 391                 if (sys_page_size > blocksize)
 392                         new_size &= ~((sys_page_size / blocksize)-1);
 393         }
 394         if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super,
 395                                        EXT4_FEATURE_INCOMPAT_64BIT)) {
 396                 /* Take 16T down to 2^32-1 blocks */
 397                 if (new_size == (1ULL << 32))
 398                         new_size--;
 399                 else if (new_size > (1ULL << 32)) {
 400                         com_err(program_name, 0, "%s",
 401                                 _("New size too large to be "
 402                                   "expressed in 32 bits\n"));
 403                         exit(1);
 404                 }
 405         }
 406
 407         if (!force && new_size < min_size) {
 408                 com_err(program_name, 0,
 409                         _("New size smaller than minimum (%llu)\n"), min_size);
 410                 exit(1);
 411         }
 412         if (use_stride >= 0) {
 413                 if (use_stride >= (int) fs->super->s_blocks_per_group) {
 414                         com_err(program_name, 0, "%s",
 415                                 _("Invalid stride length"));
 416                         exit(1);
 417                 }
 418                 fs->stride = fs->super->s_raid_stride = use_stride;
 419                 ext2fs_mark_super_dirty(fs);
 420         } else
 421                   determine_fs_stride(fs);
 422
 423         /*
 424          * If we are resizing a plain file, and it's not big enough,
 425          * automatically extend it in a sparse fashion by writing the
 426          * last requested block.
 427          */
 428         new_file_size = ((__u64) new_size) * blocksize;
 429         if ((__u64) new_file_size >
 430             (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
 431                 fd = -1;
 432         if ((new_file_size > st_buf.st_size) &&
 433             (fd > 0)) {
 434                 if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
 435                     (write(fd, "0", 1) == 1))
 436                         max_size = new_size;
 437         }
 438         if (!force && (new_size > max_size)) {
 439                 fprintf(stderr, _("The containing partition (or device)"
 440                         " is only %llu (%dk) blocks.\nYou requested a new size"
 441                         " of %llu blocks.\n\n"), max_size,
 442                         blocksize / 1024, new_size);
 443                 exit(1);
 444         }
 445         if (new_size == ext2fs_blocks_count(fs->super)) {
 446                 fprintf(stderr, _("The filesystem is already %llu (%dk) "
 447                         "blocks long.  Nothing to do!\n\n"), new_size,
 448                         blocksize / 1024);
 449                 exit(0);
 450         }
 451         if (mount_flags & EXT2_MF_MOUNTED) {
 452                 bigalloc_check(fs, force);
 453                 retval = online_resize_fs(fs, mtpt, &new_size, flags);
 454         } else {
 455                 bigalloc_check(fs, force);
 456                 printf(_("Resizing the filesystem on "
 457                          "%s to %llu (%dk) blocks.\n"),
 458                        device_name, new_size, blocksize / 1024);
 459                 retval = resize_fs(fs, &new_size, flags,
 460                                    ((flags & RESIZE_PERCENT_COMPLETE) ?
 461                                     resize_progress_func : 0));
 462         }
 463         free(mtpt);
 464         if (retval) {
 465                 com_err(program_name, retval, _("while trying to resize %s"),
 466                         device_name);
 467                 fprintf(stderr,
 468                         _("Please run 'e2fsck -fy %s' to fix the filesystem\n"
 469                           "after the aborted resize operation.\n"),
 470                         device_name);
 471                 ext2fs_close_free(&fs);
 472                 exit(1);
 473         }
 474         printf(_("The filesystem on %s is now %llu (%dk) blocks long.\n\n"),
 475                device_name, new_size, blocksize / 1024);
 476
 477         if ((st_buf.st_size > new_file_size) &&
 478             (fd > 0)) {
 479 #ifdef HAVE_FTRUNCATE64
 480                 retval = ftruncate64(fd, new_file_size);
 481 #else
 482                 retval = 0;
 483                 /* Only truncate if new_file_size doesn't overflow off_t */
 484                 if (((off_t) new_file_size) == new_file_size)
 485                         retval = ftruncate(fd, (off_t) new_file_size);
 486 #endif
 487                 if (retval)
 488                         com_err(program_name, retval,
 489                                 _("while trying to truncate %s"),
 490                                 device_name);
 491         }
 492         if (fd > 0)
 493                 close(fd);
 494         remove_error_table(&et_ext2_error_table);
 495         return (0);
 496 }