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, 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 int main (int argc, char ** argv)
 151 {
 152         errcode_t       retval;
 153         ext2_filsys     fs;
 154         int             c;
 155         int             flags = 0;
 156         int             flush = 0;
 157         int             force = 0;
 158         int             io_flags = 0;
 159         int             force_min_size = 0;
 160         int             print_min_size = 0;
 161         int             fd, ret;
 162         blk64_t         new_size = 0;
 163         blk64_t         max_size = 0;
 164         blk64_t         min_size = 0;
 165         io_manager      io_ptr;
 166         char            *new_size_str = 0;
 167         int             use_stride = -1;
 168         ext2fs_struct_stat st_buf;
 169         __s64           new_file_size;
 170         unsigned int    sys_page_size = 4096;
 171         long            sysval;
 172         int             len, mount_flags;
 173         char            *mtpt;
 174
 175 #ifdef ENABLE_NLS
 176         setlocale(LC_MESSAGES, "");
 177         setlocale(LC_CTYPE, "");
 178         bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
 179         textdomain(NLS_CAT_NAME);
 180         set_com_err_gettext(gettext);
 181 #endif
 182
 183         add_error_table(&et_ext2_error_table);
 184
 185         fprintf (stderr, "resize2fs %s (%s)\n",
 186                  E2FSPROGS_VERSION, E2FSPROGS_DATE);
 187         if (argc && *argv)
 188                 program_name = *argv;
 189
 190         while ((c = getopt (argc, argv, "d:fFhMPpS:")) != EOF) {
 191                 switch (c) {
 192                 case 'h':
 193                         usage(program_name);
 194                         break;
 195                 case 'f':
 196                         force = 1;
 197                         break;
 198                 case 'F':
 199                         flush = 1;
 200                         break;
 201                 case 'M':
 202                         force_min_size = 1;
 203                         break;
 204                 case 'P':
 205                         print_min_size = 1;
 206                         break;
 207                 case 'd':
 208                         flags |= atoi(optarg);
 209                         break;
 210                 case 'p':
 211                         flags |= RESIZE_PERCENT_COMPLETE;
 212                         break;
 213                 case 'S':
 214                         use_stride = atoi(optarg);
 215                         break;
 216                 default:
 217                         usage(program_name);
 218                 }
 219         }
 220         if (optind == argc)
 221                 usage(program_name);
 222
 223         device_name = argv[optind++];
 224         if (optind < argc)
 225                 new_size_str = argv[optind++];
 226         if (optind < argc)
 227                 usage(program_name);
 228
 229         io_options = strchr(device_name, '?');
 230         if (io_options)
 231                 *io_options++ = 0;
 232
 233         /*
 234          * Figure out whether or not the device is mounted, and if it is
 235          * where it is mounted.
 236          */
 237         len=80;
 238         while (1) {
 239                 mtpt = malloc(len);
 240                 if (!mtpt)
 241                         return ENOMEM;
 242                 mtpt[len-1] = 0;
 243                 retval = ext2fs_check_mount_point(device_name, &mount_flags,
 244                                                   mtpt, len);
 245                 if (retval) {
 246                         com_err("ext2fs_check_mount_point", retval,
 247                                 _("while determining whether %s is mounted."),
 248                                 device_name);
 249                         exit(1);
 250                 }
 251                 if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
 252                         break;
 253                 free(mtpt);
 254                 len = 2 * len;
 255         }
 256
 257         fd = ext2fs_open_file(device_name, O_RDWR, 0);
 258         if (fd < 0) {
 259                 com_err("open", errno, _("while opening %s"),
 260                         device_name);
 261                 exit(1);
 262         }
 263
 264         ret = ext2fs_fstat(fd, &st_buf);
 265         if (ret < 0) {
 266                 com_err("open", errno,
 267                         _("while getting stat information for %s"),
 268                         device_name);
 269                 exit(1);
 270         }
 271
 272         if (flush) {
 273                 retval = ext2fs_sync_device(fd, 1);
 274                 if (retval) {
 275                         com_err(argv[0], retval,
 276                                 _("while trying to flush %s"),
 277                                 device_name);
 278                         exit(1);
 279                 }
 280         }
 281
 282         if (!S_ISREG(st_buf.st_mode )) {
 283                 close(fd);
 284                 fd = -1;
 285         }
 286
 287 #ifdef CONFIG_TESTIO_DEBUG
 288         if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
 289                 io_ptr = test_io_manager;
 290                 test_io_backing_manager = unix_io_manager;
 291         } else
 292 #endif
 293                 io_ptr = unix_io_manager;
 294
 295         if (!(mount_flags & EXT2_MF_MOUNTED))
 296                 io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
 297
 298         io_flags |= EXT2_FLAG_64BITS;
 299
 300         retval = ext2fs_open2(device_name, io_options, io_flags,
 301                               0, 0, io_ptr, &fs);
 302         if (retval) {
 303                 com_err (program_name, retval, _("while trying to open %s"),
 304                          device_name);
 305                 printf (_("Couldn't find valid filesystem superblock.\n"));
 306                 exit (1);
 307         }
 308
 309         /*
 310          * Check for compatibility with the feature sets.  We need to
 311          * be more stringent than ext2fs_open().
 312          */
 313         if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
 314                 com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
 315                         "(%s)", device_name);
 316                 exit(1);
 317         }
 318
 319         /*
 320          * XXXX   The combination of flex_bg and !resize_inode causes
 321          * major problems for resize2fs, since when the group descriptors
 322          * grow in size this can potentially require multiple inode
 323          * tables to be moved aside to make room, and resize2fs chokes
 324          * rather badly in this scenario.  It's a rare combination,
 325          * except when a filesystem is expanded more than a certain
 326          * size, so for now, we'll just prohibit that combination.
 327          * This is something we should fix eventually, though.
 328          */
 329         if ((fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
 330             !(fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)) {
 331                 com_err(program_name, 0, _("%s: The combination of flex_bg "
 332                                            "and\n\t!resize_inode features "
 333                                            "is not supported by resize2fs.\n"),
 334                         device_name);
 335                 exit(1);
 336         }
 337
 338         min_size = calculate_minimum_resize_size(fs);
 339
 340         if (print_min_size) {
 341                 if (!force && ((fs->super->s_state & EXT2_ERROR_FS) ||
 342                                ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
 343                         fprintf(stderr,
 344                                 _("Please run 'e2fsck -f %s' first.\n\n"),
 345                                 device_name);
 346                         exit(1);
 347                 }
 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         retval = ext2fs_get_device_size2(device_name, fs->blocksize,
 371                                          &max_size);
 372         if (retval) {
 373                 com_err(program_name, retval,
 374                         _("while trying to determine filesystem size"));
 375                 exit(1);
 376         }
 377         if (force_min_size)
 378                 new_size = min_size;
 379         else if (new_size_str) {
 380                 new_size = parse_num_blocks2(new_size_str,
 381                                              fs->super->s_log_block_size);
 382                 if (new_size == 0) {
 383                         com_err(program_name, 0,
 384                                 _("Invalid new size: %s\n"), new_size_str);
 385                         exit(1);
 386                 }
 387         } else {
 388                 /* Take down devices exactly 16T to 2^32-1 blocks */
 389                 if (max_size == (1ULL << 32))
 390                         max_size--;
 391                 else if (max_size > (1ULL << 32)) {
 392                         com_err(program_name, 0, _("New size too large to be "
 393                                 "expressed in 32 bits\n"));
 394                         exit(1);
 395                 }
 396                 new_size = max_size;
 397                 /* Round down to an even multiple of a pagesize */
 398                 if (sys_page_size > fs->blocksize)
 399                         new_size &= ~((sys_page_size / fs->blocksize)-1);
 400         }
 401
 402         if (!force && new_size < min_size) {
 403                 com_err(program_name, 0,
 404                         _("New size smaller than minimum (%llu)\n"), min_size);
 405                 exit(1);
 406         }
 407         if (use_stride >= 0) {
 408                 if (use_stride >= (int) fs->super->s_blocks_per_group) {
 409                         com_err(program_name, 0,
 410                                 _("Invalid stride length"));
 411                         exit(1);
 412                 }
 413                 fs->stride = fs->super->s_raid_stride = use_stride;
 414                 ext2fs_mark_super_dirty(fs);
 415         } else
 416                   determine_fs_stride(fs);
 417
 418         /*
 419          * If we are resizing a plain file, and it's not big enough,
 420          * automatically extend it in a sparse fashion by writing the
 421          * last requested block.
 422          */
 423         new_file_size = ((__u64) new_size) * fs->blocksize;
 424         if ((__u64) new_file_size >
 425             (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
 426                 fd = -1;
 427         if ((new_file_size > st_buf.st_size) &&
 428             (fd > 0)) {
 429                 if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
 430                     (write(fd, "0", 1) == 1))
 431                         max_size = new_size;
 432         }
 433         if (!force && (new_size > max_size)) {
 434                 fprintf(stderr, _("The containing partition (or device)"
 435                         " is only %llu (%dk) blocks.\nYou requested a new size"
 436                         " of %llu blocks.\n\n"), max_size,
 437                         fs->blocksize / 1024, new_size);
 438                 exit(1);
 439         }
 440         if (new_size == ext2fs_blocks_count(fs->super)) {
 441                 fprintf(stderr, _("The filesystem is already %llu blocks "
 442                         "long.  Nothing to do!\n\n"), new_size);
 443                 exit(0);
 444         }
 445         if (mount_flags & EXT2_MF_MOUNTED) {
 446                 retval = online_resize_fs(fs, mtpt, &new_size, flags);
 447         } else {
 448                 if (!force && ((fs->super->s_lastcheck < fs->super->s_mtime) ||
 449                                (fs->super->s_state & EXT2_ERROR_FS) ||
 450                                ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
 451                         fprintf(stderr,
 452                                 _("Please run 'e2fsck -f %s' first.\n\n"),
 453                                 device_name);
 454                         exit(1);
 455                 }
 456                 printf(_("Resizing the filesystem on "
 457                          "%s to %llu (%dk) blocks.\n"),
 458                        device_name, new_size, fs->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(fs);
 472                 exit(1);
 473         }
 474         printf(_("The filesystem on %s is now %llu blocks long.\n\n"),
 475                device_name, new_size);
 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 }