resize/resize2fs.c

   1 /*
   2  * resize2fs.c --- ext2 main routine
   3  *
   4  * Copyright (C) 1997, 1998 by Theodore Ts'o and
   5  *      PowerQuest, Inc.
   6  *
   7  * Copyright (C) 1999, 2000 by Theosore 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 /*
  16  * Resizing a filesystem consists of the following phases:
  17  *
  18  *      1.  Adjust superblock and write out new parts of the inode
  19  *              table
  20  *      2.  Determine blocks which need to be relocated, and copy the
  21  *              contents of blocks from their old locations to the new ones.
  22  *      3.  Scan the inode table, doing the following:
  23  *              a.  If blocks have been moved, update the block
  24  *                      pointers in the inodes and indirect blocks to
  25  *                      point at the new block locations.
  26  *              b.  If parts of the inode table need to be evacuated,
  27  *                      copy inodes from their old locations to their
  28  *                      new ones.
  29  *              c.  If (b) needs to be done, note which blocks contain
  30  *                      directory information, since we will need to
  31  *                      update the directory information.
  32  *      4.  Update the directory blocks with the new inode locations.
  33  *      5.  Move the inode tables, if necessary.
  34  */
  35
  36 #include "resize2fs.h"
  37 #include <time.h>
  38
  39 #ifdef __linux__                        /* Kludge for debugging */
  40 #define RESIZE2FS_DEBUG
  41 #endif
  42
  43 static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size);
  44 static errcode_t blocks_to_move(ext2_resize_t rfs);
  45 static errcode_t block_mover(ext2_resize_t rfs);
  46 static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
  47 static errcode_t inode_ref_fix(ext2_resize_t rfs);
  48 static errcode_t move_itables(ext2_resize_t rfs);
  49 static errcode_t fix_resize_inode(ext2_filsys fs);
  50 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
  51
  52 /*
  53  * Some helper CPP macros
  54  */
  55 #define FS_BLOCK_BM(fs, i) ((fs)->group_desc[(i)].bg_block_bitmap)
  56 #define FS_INODE_BM(fs, i) ((fs)->group_desc[(i)].bg_inode_bitmap)
  57 #define FS_INODE_TB(fs, i) ((fs)->group_desc[(i)].bg_inode_table)
  58
  59 #define IS_BLOCK_BM(fs, i, blk) ((blk) == FS_BLOCK_BM((fs),(i)))
  60 #define IS_INODE_BM(fs, i, blk) ((blk) == FS_INODE_BM((fs),(i)))
  61
  62 #define IS_INODE_TB(fs, i, blk) (((blk) >= FS_INODE_TB((fs), (i))) && \
  63                                  ((blk) < (FS_INODE_TB((fs), (i)) + \
  64                                            (fs)->inode_blocks_per_group)))
  65
  66
  67
  68 /*
  69  * This is the top-level routine which does the dirty deed....
  70  */
  71 errcode_t resize_fs(ext2_filsys fs, blk_t *new_size, int flags,
  72                     errcode_t (*progress)(ext2_resize_t rfs, int pass,
  73                                      unsigned long cur,
  74                                      unsigned long max_val))
  75 {
  76         ext2_resize_t   rfs;
  77         errcode_t       retval;
  78
  79         retval = ext2fs_read_bitmaps(fs);
  80         if (retval)
  81                 return retval;
  82
  83         /*
  84          * Create the data structure
  85          */
  86         retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
  87         if (retval)
  88                 return retval;
  89         memset(rfs, 0, sizeof(struct ext2_resize_struct));
  90
  91         rfs->old_fs = fs;
  92         rfs->flags = flags;
  93         rfs->itable_buf  = 0;
  94         rfs->progress = progress;
  95         retval = ext2fs_dup_handle(fs, &rfs->new_fs);
  96         if (retval)
  97                 goto errout;
  98
  99         retval = adjust_superblock(rfs, *new_size);
 100         if (retval)
 101                 goto errout;
 102
 103         *new_size = rfs->new_fs->super->s_blocks_count;
 104
 105         retval = blocks_to_move(rfs);
 106         if (retval)
 107                 goto errout;
 108
 109 #ifdef RESIZE2FS_DEBUG
 110         if (rfs->flags & RESIZE_DEBUG_BMOVE)
 111                 printf("Number of free blocks: %d/%d, Needed: %d\n",
 112                        rfs->old_fs->super->s_free_blocks_count,
 113                        rfs->new_fs->super->s_free_blocks_count,
 114                        rfs->needed_blocks);
 115 #endif
 116
 117         retval = block_mover(rfs);
 118         if (retval)
 119                 goto errout;
 120
 121         retval = inode_scan_and_fix(rfs);
 122         if (retval)
 123                 goto errout;
 124
 125         retval = inode_ref_fix(rfs);
 126         if (retval)
 127                 goto errout;
 128
 129         retval = move_itables(rfs);
 130         if (retval)
 131                 goto errout;
 132
 133         retval = ext2fs_calculate_summary_stats(rfs->new_fs);
 134         if (retval)
 135                 goto errout;
 136
 137         retval = fix_resize_inode(rfs->new_fs);
 138         if (retval)
 139                 goto errout;
 140
 141         retval = ext2fs_close(rfs->new_fs);
 142         if (retval)
 143                 goto errout;
 144
 145         rfs->flags = flags;
 146
 147         ext2fs_free(rfs->old_fs);
 148         if (rfs->itable_buf)
 149                 ext2fs_free_mem(&rfs->itable_buf);
 150         ext2fs_free_mem(&rfs);
 151
 152         return 0;
 153
 154 errout:
 155         if (rfs->new_fs)
 156                 ext2fs_free(rfs->new_fs);
 157         if (rfs->itable_buf)
 158                 ext2fs_free_mem(&rfs->itable_buf);
 159         ext2fs_free_mem(&rfs);
 160         return retval;
 161 }
 162
 163 /* --------------------------------------------------------------------
 164  *
 165  * Resize processing, phase 1.
 166  *
 167  * In this phase we adjust the in-memory superblock information, and
 168  * initialize any new parts of the inode table.  The new parts of the
 169  * inode table are created in virgin disk space, so we can abort here
 170  * without any side effects.
 171  * --------------------------------------------------------------------
 172  */
 173
 174 /*
 175  * This routine adjusts the superblock and other data structures...
 176  */
 177 static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size)
 178 {
 179         ext2_filsys fs;
 180         int             overhead = 0;
 181         int             rem, adj = 0;
 182         errcode_t       retval;
 183         ext2_ino_t      real_end;
 184         blk_t           blk, group_block;
 185         unsigned long   i, j, old_desc_blocks;
 186         int             old_numblocks, numblocks, adjblocks;
 187         unsigned int    meta_bg, meta_bg_size;
 188         int             has_super;
 189         unsigned long   max_group;
 190
 191         fs = rfs->new_fs;
 192         fs->super->s_blocks_count = new_size;
 193         ext2fs_mark_super_dirty(fs);
 194         ext2fs_mark_bb_dirty(fs);
 195         ext2fs_mark_ib_dirty(fs);
 196
 197 retry:
 198         fs->group_desc_count = (fs->super->s_blocks_count -
 199                                 fs->super->s_first_data_block +
 200                                 EXT2_BLOCKS_PER_GROUP(fs->super) - 1)
 201                 / EXT2_BLOCKS_PER_GROUP(fs->super);
 202         if (fs->group_desc_count == 0)
 203                 return EXT2_ET_TOOSMALL;
 204         fs->desc_blocks = (fs->group_desc_count +
 205                            EXT2_DESC_PER_BLOCK(fs->super) - 1)
 206                 / EXT2_DESC_PER_BLOCK(fs->super);
 207
 208         /*
 209          * Overhead is the number of bookkeeping blocks per group.  It
 210          * includes the superblock backup, the group descriptor
 211          * backups, the inode bitmap, the block bitmap, and the inode
 212          * table.
 213          */
 214         overhead = (int) (2 + fs->inode_blocks_per_group);
 215
 216         if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
 217                 overhead += 1 + fs->desc_blocks +
 218                         fs->super->s_reserved_gdt_blocks;
 219
 220         /*
 221          * See if the last group is big enough to support the
 222          * necessary data structures.  If not, we need to get rid of
 223          * it.
 224          */
 225         rem = (fs->super->s_blocks_count - fs->super->s_first_data_block) %
 226                 fs->super->s_blocks_per_group;
 227         if ((fs->group_desc_count == 1) && rem && (rem < overhead))
 228                 return EXT2_ET_TOOSMALL;
 229         if (rem && (rem < overhead+50)) {
 230                 fs->super->s_blocks_count -= rem;
 231                 goto retry;
 232         }
 233         /*
 234          * Adjust the number of inodes
 235          */
 236         fs->super->s_inodes_count = fs->super->s_inodes_per_group *
 237                 fs->group_desc_count;
 238
 239         /*
 240          * Adjust the number of free blocks
 241          */
 242         blk = rfs->old_fs->super->s_blocks_count;
 243         if (blk > fs->super->s_blocks_count)
 244                 fs->super->s_free_blocks_count -=
 245                         (blk - fs->super->s_blocks_count);
 246         else
 247                 fs->super->s_free_blocks_count +=
 248                         (fs->super->s_blocks_count - blk);
 249
 250         /*
 251          * Adjust the number of reserved blocks
 252          */
 253         blk = rfs->old_fs->super->s_r_blocks_count * 100 /
 254                 rfs->old_fs->super->s_blocks_count;
 255         fs->super->s_r_blocks_count = ((fs->super->s_blocks_count * blk)
 256                                        / 100);
 257
 258         /*
 259          * Adjust the bitmaps for size
 260          */
 261         retval = ext2fs_resize_inode_bitmap(fs->super->s_inodes_count,
 262                                             fs->super->s_inodes_count,
 263                                             fs->inode_map);
 264         if (retval) goto errout;
 265
 266         real_end = ((EXT2_BLOCKS_PER_GROUP(fs->super)
 267                      * fs->group_desc_count)) - 1 +
 268                              fs->super->s_first_data_block;
 269         retval = ext2fs_resize_block_bitmap(fs->super->s_blocks_count-1,
 270                                             real_end, fs->block_map);
 271
 272         if (retval) goto errout;
 273
 274         /*
 275          * Reallocate the group descriptors as necessary.
 276          */
 277         if (rfs->old_fs->desc_blocks != fs->desc_blocks) {
 278                 retval = ext2fs_resize_mem(rfs->old_fs->desc_blocks *
 279                                            fs->blocksize,
 280                                            fs->desc_blocks * fs->blocksize,
 281                                            &fs->group_desc);
 282                 if (retval)
 283                         goto errout;
 284         }
 285
 286         /*
 287          * Check to make sure there are enough inodes
 288          */
 289         if ((rfs->old_fs->super->s_inodes_count -
 290              rfs->old_fs->super->s_free_inodes_count) >
 291             rfs->new_fs->super->s_inodes_count) {
 292                 retval = ENOSPC;
 293                 goto errout;
 294         }
 295
 296         /*
 297          * If the resize_inode feature is set, and we are changing the
 298          * number of descriptor blocks, then adjust
 299          * s_reserved_gdt_blocks if possible to avoid needing to move
 300          * the inode table either now or in the future.
 301          */
 302         if ((fs->super->s_feature_compat &
 303              EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
 304             (rfs->old_fs->desc_blocks != fs->desc_blocks)) {
 305                 int new;
 306
 307                 new = ((int) fs->super->s_reserved_gdt_blocks) +
 308                         (rfs->old_fs->desc_blocks - fs->desc_blocks);
 309                 if (new < 0)
 310                         new = 0;
 311                 if (new > fs->blocksize/4)
 312                         new = fs->blocksize/4;
 313                 fs->super->s_reserved_gdt_blocks = new;
 314                 if (new == 0)
 315                         fs->super->s_feature_compat &=
 316                                 ~EXT2_FEATURE_COMPAT_RESIZE_INODE;
 317         }
 318
 319         /*
 320          * If we are shrinking the number block groups, we're done and
 321          * can exit now.
 322          */
 323         if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
 324                 retval = 0;
 325                 goto errout;
 326         }
 327         /*
 328          * Fix the count of the last (old) block group
 329          */
 330         old_numblocks = (rfs->old_fs->super->s_blocks_count -
 331                          rfs->old_fs->super->s_first_data_block) %
 332                                  rfs->old_fs->super->s_blocks_per_group;
 333         if (!old_numblocks)
 334                 old_numblocks = rfs->old_fs->super->s_blocks_per_group;
 335         if (rfs->old_fs->group_desc_count == fs->group_desc_count) {
 336                 numblocks = (rfs->new_fs->super->s_blocks_count -
 337                              rfs->new_fs->super->s_first_data_block) %
 338                                      rfs->new_fs->super->s_blocks_per_group;
 339                 if (!numblocks)
 340                         numblocks = rfs->new_fs->super->s_blocks_per_group;
 341         } else
 342                 numblocks = rfs->new_fs->super->s_blocks_per_group;
 343         i = rfs->old_fs->group_desc_count - 1;
 344         fs->group_desc[i].bg_free_blocks_count += (numblocks-old_numblocks);
 345
 346         /*
 347          * If the number of block groups is staying the same, we're
 348          * done and can exit now.  (If the number block groups is
 349          * shrinking, we had exited earlier.)
 350          */
 351         if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
 352                 retval = 0;
 353                 goto errout;
 354         }
 355         /*
 356          * Initialize the new block group descriptors
 357          */
 358         retval = ext2fs_get_mem(fs->blocksize * fs->inode_blocks_per_group,
 359                                 &rfs->itable_buf);
 360         if (retval)
 361                 goto errout;
 362
 363         memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
 364         group_block = fs->super->s_first_data_block +
 365                 rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
 366
 367         adj = rfs->old_fs->group_desc_count;
 368         max_group = fs->group_desc_count - adj;
 369         if (rfs->progress) {
 370                 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 371                                        0, max_group);
 372                 if (retval)
 373                         goto errout;
 374         }
 375         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 376                 old_desc_blocks = fs->super->s_first_meta_bg;
 377         else
 378                 old_desc_blocks = fs->desc_blocks +
 379                         fs->super->s_reserved_gdt_blocks;
 380         for (i = rfs->old_fs->group_desc_count;
 381              i < fs->group_desc_count; i++) {
 382                 memset(&fs->group_desc[i], 0,
 383                        sizeof(struct ext2_group_desc));
 384                 adjblocks = 0;
 385
 386                 if (i == fs->group_desc_count-1) {
 387                         numblocks = (fs->super->s_blocks_count -
 388                                      fs->super->s_first_data_block) %
 389                                              fs->super->s_blocks_per_group;
 390                         if (!numblocks)
 391                                 numblocks = fs->super->s_blocks_per_group;
 392                 } else
 393                         numblocks = fs->super->s_blocks_per_group;
 394
 395                 has_super = ext2fs_bg_has_super(fs, i);
 396                 if (has_super) {
 397                         ext2fs_mark_block_bitmap(fs->block_map, group_block);
 398                         adjblocks++;
 399                 }
 400                 meta_bg_size = (fs->blocksize /
 401                                 sizeof (struct ext2_group_desc));
 402                 meta_bg = i / meta_bg_size;
 403                 if (!(fs->super->s_feature_incompat &
 404                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 405                     (meta_bg < fs->super->s_first_meta_bg)) {
 406                         if (has_super) {
 407                                 for (j=0; j < old_desc_blocks; j++)
 408                                         ext2fs_mark_block_bitmap(fs->block_map,
 409                                                          group_block + 1 + j);
 410                                 adjblocks += old_desc_blocks;
 411                         }
 412                 } else {
 413                         if (has_super)
 414                                 has_super = 1;
 415                         if (((i % meta_bg_size) == 0) ||
 416                             ((i % meta_bg_size) == 1) ||
 417                             ((i % meta_bg_size) == (meta_bg_size-1)))
 418                                 ext2fs_mark_block_bitmap(fs->block_map,
 419                                                  group_block + has_super);
 420                 }
 421
 422                 adjblocks += 2 + fs->inode_blocks_per_group;
 423
 424                 numblocks -= adjblocks;
 425                 fs->super->s_free_blocks_count -= adjblocks;
 426                 fs->super->s_free_inodes_count +=
 427                         fs->super->s_inodes_per_group;
 428                 fs->group_desc[i].bg_free_blocks_count = numblocks;
 429                 fs->group_desc[i].bg_free_inodes_count =
 430                         fs->super->s_inodes_per_group;
 431                 fs->group_desc[i].bg_used_dirs_count = 0;
 432
 433                 retval = ext2fs_allocate_group_table(fs, i, 0);
 434                 if (retval) goto errout;
 435
 436                 /*
 437                  * Write out the new inode table
 438                  */
 439                 retval = io_channel_write_blk(fs->io,
 440                                               fs->group_desc[i].bg_inode_table,
 441                                               fs->inode_blocks_per_group,
 442                                               rfs->itable_buf);
 443                 if (retval) goto errout;
 444
 445                 io_channel_flush(fs->io);
 446                 if (rfs->progress) {
 447                         retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 448                                                i - adj + 1, max_group);
 449                         if (retval)
 450                                 goto errout;
 451                 }
 452                 group_block += fs->super->s_blocks_per_group;
 453         }
 454         io_channel_flush(fs->io);
 455         retval = 0;
 456
 457 errout:
 458         return retval;
 459 }
 460
 461 /* --------------------------------------------------------------------
 462  *
 463  * Resize processing, phase 2.
 464  *
 465  * In this phase we adjust determine which blocks need to be moved, in
 466  * blocks_to_move().  We then copy the blocks to their ultimate new
 467  * destinations using block_mover().  Since we are copying blocks to
 468  * their new locations, again during this pass we can abort without
 469  * any problems.
 470  * --------------------------------------------------------------------
 471  */
 472
 473 /*
 474  * This helper function creates a block bitmap with all of the
 475  * filesystem meta-data blocks.
 476  */
 477 static errcode_t mark_table_blocks(ext2_filsys fs,
 478                                    ext2fs_block_bitmap bmap)
 479 {
 480         blk_t                   block, b;
 481         unsigned int            j;
 482         dgrp_t                  i;
 483         unsigned long           meta_bg, meta_bg_size;
 484         int                     has_super;
 485         unsigned int            old_desc_blocks;
 486         errcode_t               retval;
 487
 488         meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
 489         block = fs->super->s_first_data_block;
 490         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 491                 old_desc_blocks = fs->super->s_first_meta_bg;
 492         else
 493                 old_desc_blocks = fs->desc_blocks +
 494                         fs->super->s_reserved_gdt_blocks;
 495         for (i = 0; i < fs->group_desc_count; i++) {
 496                 ext2fs_reserve_super_and_bgd(fs, i, bmap);
 497
 498                 /*
 499                  * Mark the blocks used for the inode table
 500                  */
 501                 for (j = 0, b = fs->group_desc[i].bg_inode_table;
 502                      j < (unsigned int) fs->inode_blocks_per_group;
 503                      j++, b++)
 504                         ext2fs_mark_block_bitmap(bmap, b);
 505
 506                 /*
 507                  * Mark block used for the block bitmap
 508                  */
 509                 ext2fs_mark_block_bitmap(bmap,
 510                                          fs->group_desc[i].bg_block_bitmap);
 511
 512                 /*
 513                  * Mark block used for the inode bitmap
 514                  */
 515                 ext2fs_mark_block_bitmap(bmap,
 516                                          fs->group_desc[i].bg_inode_bitmap);
 517                 block += fs->super->s_blocks_per_group;
 518         }
 519         return 0;
 520 }
 521
 522 /*
 523  * This function checks to see if a particular block (either a
 524  * superblock or a block group descriptor) overlaps with an inode or
 525  * block bitmap block, or with the inode table.
 526  */
 527 static void mark_fs_metablock(ext2_resize_t rfs,
 528                               ext2fs_block_bitmap meta_bmap,
 529                               int group, blk_t blk)
 530 {
 531         ext2_filsys     fs = rfs->new_fs;
 532
 533         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 534         ext2fs_mark_block_bitmap(fs->block_map, blk);
 535
 536         /*
 537          * Check to see if we overlap with the inode or block bitmap,
 538          * or the inode tables.  If not, and the block is in use, then
 539          * mark it as a block to be moved.
 540          */
 541         if (IS_BLOCK_BM(fs, group, blk)) {
 542                 FS_BLOCK_BM(fs, group) = 0;
 543                 rfs->needed_blocks++;
 544         } else if (IS_INODE_BM(fs, group, blk)) {
 545                 FS_INODE_BM(fs, group) = 0;
 546                 rfs->needed_blocks++;
 547         } else if (IS_INODE_TB(fs, group, blk)) {
 548                 FS_INODE_TB(fs, group) = 0;
 549                 rfs->needed_blocks++;
 550         } else if (ext2fs_test_block_bitmap(rfs->old_fs->block_map, blk) &&
 551                    !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 552                 ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 553                 rfs->needed_blocks++;
 554         }
 555 }
 556
 557
 558 /*
 559  * This routine marks and unmarks reserved blocks in the new block
 560  * bitmap.  It also determines which blocks need to be moved and
 561  * places this information into the move_blocks bitmap.
 562  */
 563 static errcode_t blocks_to_move(ext2_resize_t rfs)
 564 {
 565         int             j, has_super;
 566         dgrp_t          i, max_groups;
 567         blk_t           blk, group_blk;
 568         unsigned long   old_blocks, new_blocks;
 569         unsigned int    meta_bg, meta_bg_size;
 570         errcode_t       retval;
 571         ext2_filsys     fs, old_fs;
 572         ext2fs_block_bitmap     meta_bmap;
 573
 574         fs = rfs->new_fs;
 575         old_fs = rfs->old_fs;
 576         if (old_fs->super->s_blocks_count > fs->super->s_blocks_count)
 577                 fs = rfs->old_fs;
 578
 579         retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
 580                                               &rfs->reserve_blocks);
 581         if (retval)
 582                 return retval;
 583
 584         retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
 585                                               &rfs->move_blocks);
 586         if (retval)
 587                 return retval;
 588
 589         retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
 590                                               &meta_bmap);
 591         if (retval)
 592                 return retval;
 593
 594         retval = mark_table_blocks(old_fs, meta_bmap);
 595         if (retval)
 596                 return retval;
 597
 598         fs = rfs->new_fs;
 599
 600         /*
 601          * If we're shrinking the filesystem, we need to move all of
 602          * the blocks that don't fit any more
 603          */
 604         for (blk = fs->super->s_blocks_count;
 605              blk < old_fs->super->s_blocks_count; blk++) {
 606                 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 607                     !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 608                         ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 609                         rfs->needed_blocks++;
 610                 }
 611                 ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 612         }
 613
 614         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
 615                 old_blocks = old_fs->super->s_first_meta_bg;
 616                 new_blocks = fs->super->s_first_meta_bg;
 617         } else {
 618                 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
 619                 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
 620         }
 621
 622         if (old_blocks == new_blocks) {
 623                 retval = 0;
 624                 goto errout;
 625         }
 626
 627         max_groups = fs->group_desc_count;
 628         if (max_groups > old_fs->group_desc_count)
 629                 max_groups = old_fs->group_desc_count;
 630         group_blk = old_fs->super->s_first_data_block;
 631         /*
 632          * If we're reducing the number of descriptor blocks, this
 633          * makes life easy.  :-)   We just have to mark some extra
 634          * blocks as free.
 635          */
 636         if (old_blocks > new_blocks) {
 637                 for (i = 0; i < max_groups; i++) {
 638                         if (!ext2fs_bg_has_super(fs, i)) {
 639                                 group_blk += fs->super->s_blocks_per_group;
 640                                 continue;
 641                         }
 642                         for (blk = group_blk+1+new_blocks;
 643                              blk < group_blk+1+old_blocks; blk++) {
 644                                 ext2fs_unmark_block_bitmap(fs->block_map,
 645                                                            blk);
 646                                 rfs->needed_blocks--;
 647                         }
 648                         group_blk += fs->super->s_blocks_per_group;
 649                 }
 650                 retval = 0;
 651                 goto errout;
 652         }
 653         /*
 654          * If we're increasing the number of descriptor blocks, life
 655          * gets interesting....
 656          */
 657         meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
 658         for (i = 0; i < max_groups; i++) {
 659                 has_super = ext2fs_bg_has_super(fs, i);
 660                 if (has_super)
 661                         mark_fs_metablock(rfs, meta_bmap, i, group_blk);
 662
 663                 meta_bg = i / meta_bg_size;
 664                 if (!(fs->super->s_feature_incompat &
 665                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 666                     (meta_bg < fs->super->s_first_meta_bg)) {
 667                         if (has_super) {
 668                                 for (blk = group_blk+1;
 669                                      blk < group_blk + 1 + new_blocks; blk++)
 670                                         mark_fs_metablock(rfs, meta_bmap,
 671                                                           i, blk);
 672                         }
 673                 } else {
 674                         if (has_super)
 675                                 has_super = 1;
 676                         if (((i % meta_bg_size) == 0) ||
 677                             ((i % meta_bg_size) == 1) ||
 678                             ((i % meta_bg_size) == (meta_bg_size-1)))
 679                                 mark_fs_metablock(rfs, meta_bmap, i,
 680                                                   group_blk + has_super);
 681                 }
 682
 683                 if (fs->group_desc[i].bg_inode_table &&
 684                     fs->group_desc[i].bg_inode_bitmap &&
 685                     fs->group_desc[i].bg_block_bitmap)
 686                         goto next_group;
 687
 688                 /*
 689                  * Reserve the existing meta blocks that we know
 690                  * aren't to be moved.
 691                  */
 692                 if (fs->group_desc[i].bg_block_bitmap)
 693                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 694                                  fs->group_desc[i].bg_block_bitmap);
 695                 if (fs->group_desc[i].bg_inode_bitmap)
 696                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 697                                  fs->group_desc[i].bg_inode_bitmap);
 698                 if (fs->group_desc[i].bg_inode_table)
 699                         for (blk = fs->group_desc[i].bg_inode_table, j=0;
 700                              j < fs->inode_blocks_per_group ; j++, blk++)
 701                                 ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 702                                                          blk);
 703
 704                 /*
 705                  * Allocate the missing data structures
 706                  */
 707                 retval = ext2fs_allocate_group_table(fs, i,
 708                                                      rfs->reserve_blocks);
 709                 if (retval)
 710                         goto errout;
 711
 712                 /*
 713                  * For those structures that have changed, we need to
 714                  * do bookkeepping.
 715                  */
 716                 if (FS_BLOCK_BM(old_fs, i) !=
 717                     (blk = FS_BLOCK_BM(fs, i))) {
 718                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 719                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 720                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 721                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 722                                                          blk);
 723                 }
 724                 if (FS_INODE_BM(old_fs, i) !=
 725                     (blk = FS_INODE_BM(fs, i))) {
 726                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 727                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 728                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 729                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 730                                                          blk);
 731                 }
 732
 733                 /*
 734                  * The inode table, if we need to relocate it, is
 735                  * handled specially.  We have to reserve the blocks
 736                  * for both the old and the new inode table, since we
 737                  * can't have the inode table be destroyed during the
 738                  * block relocation phase.
 739                  */
 740                 if (FS_INODE_TB(fs, i) == FS_INODE_TB(old_fs, i))
 741                         goto next_group; /* inode table not moved */
 742
 743                 rfs->needed_blocks += fs->inode_blocks_per_group;
 744
 745                 /*
 746                  * Mark the new inode table as in use in the new block
 747                  * allocation bitmap, and move any blocks that might
 748                  * be necessary.
 749                  */
 750                 for (blk = fs->group_desc[i].bg_inode_table, j=0;
 751                      j < fs->inode_blocks_per_group ; j++, blk++) {
 752                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 753                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 754                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 755                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 756                                                          blk);
 757                 }
 758
 759                 /*
 760                  * Make sure the old inode table is reserved in the
 761                  * block reservation bitmap.
 762                  */
 763                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
 764                      j < fs->inode_blocks_per_group ; j++, blk++)
 765                         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 766
 767         next_group:
 768                 group_blk += rfs->new_fs->super->s_blocks_per_group;
 769         }
 770         retval = 0;
 771
 772 errout:
 773         if (meta_bmap)
 774                 ext2fs_free_block_bitmap(meta_bmap);
 775
 776         return retval;
 777 }
 778
 779 /*
 780  * This helper function tries to allocate a new block.  We try to
 781  * avoid hitting the original group descriptor blocks at least at
 782  * first, since we want to make it possible to recover from a badly
 783  * aborted resize operation as much as possible.
 784  *
 785  * In the future, I may further modify this routine to balance out
 786  * where we get the new blocks across the various block groups.
 787  * Ideally we would allocate blocks that corresponded with the block
 788  * group of the containing inode, and keep contiguous blocks
 789  * together.  However, this very difficult to do efficiently, since we
 790  * don't have the necessary information up front.
 791  */
 792
 793 #define AVOID_OLD       1
 794 #define DESPERATION     2
 795
 796 static void init_block_alloc(ext2_resize_t rfs)
 797 {
 798         rfs->alloc_state = AVOID_OLD;
 799         rfs->new_blk = rfs->new_fs->super->s_first_data_block;
 800 #if 0
 801         /* HACK for testing */
 802         if (rfs->new_fs->super->s_blocks_count >
 803             rfs->old_fs->super->s_blocks_count)
 804                 rfs->new_blk = rfs->old_fs->super->s_blocks_count;
 805 #endif
 806 }
 807
 808 static blk_t get_new_block(ext2_resize_t rfs)
 809 {
 810         ext2_filsys     fs = rfs->new_fs;
 811
 812         while (1) {
 813                 if (rfs->new_blk >= fs->super->s_blocks_count) {
 814                         if (rfs->alloc_state == DESPERATION)
 815                                 return 0;
 816
 817 #ifdef RESIZE2FS_DEBUG
 818                         if (rfs->flags & RESIZE_DEBUG_BMOVE)
 819                                 printf("Going into desperation mode "
 820                                        "for block allocations\n");
 821 #endif
 822                         rfs->alloc_state = DESPERATION;
 823                         rfs->new_blk = fs->super->s_first_data_block;
 824                         continue;
 825                 }
 826                 if (ext2fs_test_block_bitmap(fs->block_map, rfs->new_blk) ||
 827                     ext2fs_test_block_bitmap(rfs->reserve_blocks,
 828                                              rfs->new_blk) ||
 829                     ((rfs->alloc_state == AVOID_OLD) &&
 830                      (rfs->new_blk < rfs->old_fs->super->s_blocks_count) &&
 831                      ext2fs_test_block_bitmap(rfs->old_fs->block_map,
 832                                               rfs->new_blk))) {
 833                         rfs->new_blk++;
 834                         continue;
 835                 }
 836                 return rfs->new_blk;
 837         }
 838 }
 839
 840 static errcode_t block_mover(ext2_resize_t rfs)
 841 {
 842         blk_t                   blk, old_blk, new_blk;
 843         ext2_filsys             fs = rfs->new_fs;
 844         ext2_filsys             old_fs = rfs->old_fs;
 845         errcode_t               retval;
 846         int                     size, c;
 847         int                     to_move, moved;
 848         ext2_badblocks_list     badblock_list = 0;
 849         int                     bb_modified = 0;
 850
 851         retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
 852         if (retval)
 853                 return retval;
 854
 855         new_blk = fs->super->s_first_data_block;
 856         if (!rfs->itable_buf) {
 857                 retval = ext2fs_get_mem(fs->blocksize *
 858                                         fs->inode_blocks_per_group,
 859                                         &rfs->itable_buf);
 860                 if (retval)
 861                         return retval;
 862         }
 863         retval = ext2fs_create_extent_table(&rfs->bmap, 0);
 864         if (retval)
 865                 return retval;
 866
 867         /*
 868          * The first step is to figure out where all of the blocks
 869          * will go.
 870          */
 871         to_move = moved = 0;
 872         init_block_alloc(rfs);
 873         for (blk = old_fs->super->s_first_data_block;
 874              blk < old_fs->super->s_blocks_count; blk++) {
 875                 if (!ext2fs_test_block_bitmap(old_fs->block_map, blk))
 876                         continue;
 877                 if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk))
 878                         continue;
 879                 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
 880                         ext2fs_badblocks_list_del(badblock_list, blk);
 881                         bb_modified++;
 882                         continue;
 883                 }
 884
 885                 new_blk = get_new_block(rfs);
 886                 if (!new_blk) {
 887                         retval = ENOSPC;
 888                         goto errout;
 889                 }
 890                 ext2fs_mark_block_bitmap(fs->block_map, new_blk);
 891                 ext2fs_add_extent_entry(rfs->bmap, blk, new_blk);
 892                 to_move++;
 893         }
 894
 895         if (to_move == 0) {
 896                 if (rfs->bmap) {
 897                         ext2fs_free_extent_table(rfs->bmap);
 898                         rfs->bmap = 0;
 899                 }
 900                 retval = 0;
 901                 goto errout;
 902         }
 903
 904         /*
 905          * Step two is to actually move the blocks
 906          */
 907         retval =  ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
 908         if (retval) goto errout;
 909
 910         if (rfs->progress) {
 911                 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
 912                                          0, to_move);
 913                 if (retval)
 914                         goto errout;
 915         }
 916         while (1) {
 917                 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
 918                 if (retval) goto errout;
 919                 if (!size)
 920                         break;
 921 #ifdef RESIZE2FS_DEBUG
 922                 if (rfs->flags & RESIZE_DEBUG_BMOVE)
 923                         printf("Moving %d blocks %u->%u\n",
 924                                size, old_blk, new_blk);
 925 #endif
 926                 do {
 927                         c = size;
 928                         if (c > fs->inode_blocks_per_group)
 929                                 c = fs->inode_blocks_per_group;
 930                         retval = io_channel_read_blk(fs->io, old_blk, c,
 931                                                      rfs->itable_buf);
 932                         if (retval) goto errout;
 933                         retval = io_channel_write_blk(fs->io, new_blk, c,
 934                                                       rfs->itable_buf);
 935                         if (retval) goto errout;
 936                         size -= c;
 937                         new_blk += c;
 938                         old_blk += c;
 939                         moved += c;
 940                         if (rfs->progress) {
 941                                 io_channel_flush(fs->io);
 942                                 retval = (rfs->progress)(rfs,
 943                                                 E2_RSZ_BLOCK_RELOC_PASS,
 944                                                 moved, to_move);
 945                                 if (retval)
 946                                         goto errout;
 947                         }
 948                 } while (size > 0);
 949                 io_channel_flush(fs->io);
 950         }
 951
 952 errout:
 953         if (badblock_list) {
 954                 if (!retval && bb_modified)
 955                         retval = ext2fs_update_bb_inode(old_fs,
 956                                                         badblock_list);
 957                 ext2fs_badblocks_list_free(badblock_list);
 958         }
 959         return retval;
 960 }
 961
 962
 963 /* --------------------------------------------------------------------
 964  *
 965  * Resize processing, phase 3
 966  *
 967  * --------------------------------------------------------------------
 968  */
 969
 970
 971 struct process_block_struct {
 972         ext2_resize_t           rfs;
 973         ext2_ino_t              ino;
 974         struct ext2_inode *     inode;
 975         errcode_t               error;
 976         int                     is_dir;
 977         int                     changed;
 978 };
 979
 980 static int process_block(ext2_filsys fs, blk_t  *block_nr,
 981                          e2_blkcnt_t blockcnt,
 982                          blk_t ref_block EXT2FS_ATTR((unused)),
 983                          int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
 984 {
 985         struct process_block_struct *pb;
 986         errcode_t       retval;
 987         blk_t           block, new_block;
 988         int             ret = 0;
 989
 990         pb = (struct process_block_struct *) priv_data;
 991         block = *block_nr;
 992         if (pb->rfs->bmap) {
 993                 new_block = ext2fs_extent_translate(pb->rfs->bmap, block);
 994                 if (new_block) {
 995                         *block_nr = new_block;
 996                         ret |= BLOCK_CHANGED;
 997                         pb->changed = 1;
 998 #ifdef RESIZE2FS_DEBUG
 999                         if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1000                                 printf("ino=%u, blockcnt=%lld, %u->%u\n",
1001                                        pb->ino, blockcnt, block, new_block);
1002 #endif
1003                         block = new_block;
1004                 }
1005         }
1006         if (pb->is_dir) {
1007                 retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
1008                                               block, (int) blockcnt);
1009                 if (retval) {
1010                         pb->error = retval;
1011                         ret |= BLOCK_ABORT;
1012                 }
1013         }
1014         return ret;
1015 }
1016
1017 /*
1018  * Progress callback
1019  */
1020 static errcode_t progress_callback(ext2_filsys fs,
1021                                    ext2_inode_scan scan EXT2FS_ATTR((unused)),
1022                                    dgrp_t group, void * priv_data)
1023 {
1024         ext2_resize_t rfs = (ext2_resize_t) priv_data;
1025         errcode_t               retval;
1026
1027         /*
1028          * This check is to protect against old ext2 libraries.  It
1029          * shouldn't be needed against new libraries.
1030          */
1031         if ((group+1) == 0)
1032                 return 0;
1033
1034         if (rfs->progress) {
1035                 io_channel_flush(fs->io);
1036                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1037                                          group+1, fs->group_desc_count);
1038                 if (retval)
1039                         return retval;
1040         }
1041
1042         return 0;
1043 }
1044
1045 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1046 {
1047         struct process_block_struct     pb;
1048         ext2_ino_t              ino, new_inode;
1049         struct ext2_inode       inode;
1050         ext2_inode_scan         scan = NULL;
1051         errcode_t               retval;
1052         int                     group;
1053         char                    *block_buf = 0;
1054         ext2_ino_t              start_to_move;
1055         blk_t                   orig_size, new_block;
1056
1057         if ((rfs->old_fs->group_desc_count <=
1058              rfs->new_fs->group_desc_count) &&
1059             !rfs->bmap)
1060                 return 0;
1061
1062         /*
1063          * Save the original size of the old filesystem, and
1064          * temporarily set the size to be the new size if the new size
1065          * is larger.  We need to do this to avoid catching an error
1066          * by the block iterator routines
1067          */
1068         orig_size = rfs->old_fs->super->s_blocks_count;
1069         if (orig_size < rfs->new_fs->super->s_blocks_count)
1070                 rfs->old_fs->super->s_blocks_count =
1071                         rfs->new_fs->super->s_blocks_count;
1072
1073         retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1074         if (retval) goto errout;
1075
1076         retval = ext2fs_init_dblist(rfs->old_fs, 0);
1077         if (retval) goto errout;
1078         retval = ext2fs_get_mem(rfs->old_fs->blocksize * 3, &block_buf);
1079         if (retval) goto errout;
1080
1081         start_to_move = (rfs->new_fs->group_desc_count *
1082                          rfs->new_fs->super->s_inodes_per_group);
1083
1084         if (rfs->progress) {
1085                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1086                                          0, rfs->old_fs->group_desc_count);
1087                 if (retval)
1088                         goto errout;
1089         }
1090         ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1091         pb.rfs = rfs;
1092         pb.inode = &inode;
1093         pb.error = 0;
1094         new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1095         /*
1096          * First, copy all of the inodes that need to be moved
1097          * elsewhere in the inode table
1098          */
1099         while (1) {
1100                 retval = ext2fs_get_next_inode(scan, &ino, &inode);
1101                 if (retval) goto errout;
1102                 if (!ino)
1103                         break;
1104
1105                 if (inode.i_links_count == 0 && ino != EXT2_RESIZE_INO)
1106                         continue; /* inode not in use */
1107
1108                 pb.is_dir = LINUX_S_ISDIR(inode.i_mode);
1109                 pb.changed = 0;
1110
1111                 if (inode.i_file_acl && rfs->bmap) {
1112                         new_block = ext2fs_extent_translate(rfs->bmap,
1113                                                             inode.i_file_acl);
1114                         if (new_block) {
1115                                 inode.i_file_acl = new_block;
1116                                 retval = ext2fs_write_inode(rfs->old_fs,
1117                                                             ino, &inode);
1118                                 if (retval) goto errout;
1119                         }
1120                 }
1121
1122                 if (ext2fs_inode_has_valid_blocks(&inode) &&
1123                     (rfs->bmap || pb.is_dir)) {
1124                         pb.ino = ino;
1125                         retval = ext2fs_block_iterate2(rfs->old_fs,
1126                                                        ino, 0, block_buf,
1127                                                        process_block, &pb);
1128                         if (retval)
1129                                 goto errout;
1130                         if (pb.error) {
1131                                 retval = pb.error;
1132                                 goto errout;
1133                         }
1134                 }
1135
1136                 if (ino <= start_to_move)
1137                         continue; /* Don't need to move it. */
1138
1139                 /*
1140                  * Find a new inode
1141                  */
1142                 while (1) {
1143                         if (!ext2fs_test_inode_bitmap(rfs->new_fs->inode_map,
1144                                                       new_inode))
1145                                 break;
1146                         new_inode++;
1147                         if (new_inode > rfs->new_fs->super->s_inodes_count) {
1148                                 retval = ENOSPC;
1149                                 goto errout;
1150                         }
1151                 }
1152                 ext2fs_mark_inode_bitmap(rfs->new_fs->inode_map, new_inode);
1153                 if (pb.changed) {
1154                         /* Get the new version of the inode */
1155                         retval = ext2fs_read_inode(rfs->old_fs, ino, &inode);
1156                         if (retval) goto errout;
1157                 }
1158                 inode.i_ctime = time(0);
1159                 retval = ext2fs_write_inode(rfs->old_fs, new_inode, &inode);
1160                 if (retval) goto errout;
1161
1162                 group = (new_inode-1) / EXT2_INODES_PER_GROUP(rfs->new_fs->super);
1163                 if (LINUX_S_ISDIR(inode.i_mode))
1164                         rfs->new_fs->group_desc[group].bg_used_dirs_count++;
1165
1166 #ifdef RESIZE2FS_DEBUG
1167                 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1168                         printf("Inode moved %u->%u\n", ino, new_inode);
1169 #endif
1170                 if (!rfs->imap) {
1171                         retval = ext2fs_create_extent_table(&rfs->imap, 0);
1172                         if (retval)
1173                                 goto errout;
1174                 }
1175                 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1176         }
1177         io_channel_flush(rfs->old_fs->io);
1178
1179 errout:
1180         rfs->old_fs->super->s_blocks_count = orig_size;
1181         if (rfs->bmap) {
1182                 ext2fs_free_extent_table(rfs->bmap);
1183                 rfs->bmap = 0;
1184         }
1185         if (scan)
1186                 ext2fs_close_inode_scan(scan);
1187         if (block_buf)
1188                 ext2fs_free_mem(&block_buf);
1189         return retval;
1190 }
1191
1192 /* --------------------------------------------------------------------
1193  *
1194  * Resize processing, phase 4.
1195  *
1196  * --------------------------------------------------------------------
1197  */
1198
1199 struct istruct {
1200         ext2_resize_t rfs;
1201         errcode_t       err;
1202         unsigned long   max_dirs;
1203         int             num;
1204 };
1205
1206 static int check_and_change_inodes(ext2_ino_t dir,
1207                                    int entry EXT2FS_ATTR((unused)),
1208                                    struct ext2_dir_entry *dirent, int offset,
1209                                    int  blocksize EXT2FS_ATTR((unused)),
1210                                    char *buf EXT2FS_ATTR((unused)),
1211                                    void *priv_data)
1212 {
1213         struct istruct *is = (struct istruct *) priv_data;
1214         struct ext2_inode       inode;
1215         ext2_ino_t              new_inode;
1216         errcode_t               retval;
1217
1218         if (is->rfs->progress && offset == 0) {
1219                 io_channel_flush(is->rfs->old_fs->io);
1220                 is->err = (is->rfs->progress)(is->rfs,
1221                                               E2_RSZ_INODE_REF_UPD_PASS,
1222                                               ++is->num, is->max_dirs);
1223                 if (is->err)
1224                         return DIRENT_ABORT;
1225         }
1226
1227         if (!dirent->inode)
1228                 return 0;
1229
1230         new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1231
1232         if (!new_inode)
1233                 return 0;
1234 #ifdef RESIZE2FS_DEBUG
1235         if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1236                 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1237                        dir, dirent->name_len&0xFF, dirent->name,
1238                        dirent->inode, new_inode);
1239 #endif
1240
1241         dirent->inode = new_inode;
1242
1243         /* Update the directory mtime and ctime */
1244         retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1245         if (retval == 0) {
1246                 inode.i_mtime = inode.i_ctime = time(0);
1247                 ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1248         }
1249
1250         return DIRENT_CHANGED;
1251 }
1252
1253 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1254 {
1255         errcode_t               retval;
1256         struct istruct          is;
1257
1258         if (!rfs->imap)
1259                 return 0;
1260
1261         /*
1262          * Now, we iterate over all of the directories to update the
1263          * inode references
1264          */
1265         is.num = 0;
1266         is.max_dirs = ext2fs_dblist_count(rfs->old_fs->dblist);
1267         is.rfs = rfs;
1268         is.err = 0;
1269
1270         if (rfs->progress) {
1271                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1272                                          0, is.max_dirs);
1273                 if (retval)
1274                         goto errout;
1275         }
1276
1277         retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1278                                            DIRENT_FLAG_INCLUDE_EMPTY, 0,
1279                                            check_and_change_inodes, &is);
1280         if (retval)
1281                 goto errout;
1282         if (is.err) {
1283                 retval = is.err;
1284                 goto errout;
1285         }
1286
1287 errout:
1288         ext2fs_free_extent_table(rfs->imap);
1289         rfs->imap = 0;
1290         return retval;
1291 }
1292
1293
1294 /* --------------------------------------------------------------------
1295  *
1296  * Resize processing, phase 5.
1297  *
1298  * In this phase we actually move the inode table around, and then
1299  * update the summary statistics.  This is scary, since aborting here
1300  * will potentially scramble the filesystem.  (We are moving the
1301  * inode tables around in place, and so the potential for lost data,
1302  * or at the very least scrambling the mapping between filenames and
1303  * inode numbers is very high in case of a power failure here.)
1304  * --------------------------------------------------------------------
1305  */
1306
1307
1308 /*
1309  * A very scary routine --- this one moves the inode table around!!!
1310  *
1311  * After this you have to use the rfs->new_fs file handle to read and
1312  * write inodes.
1313  */
1314 static errcode_t move_itables(ext2_resize_t rfs)
1315 {
1316         int             n, num, size, diff;
1317         dgrp_t          i, max_groups;
1318         ext2_filsys     fs = rfs->new_fs;
1319         char            *cp;
1320         blk_t           old_blk, new_blk, blk;
1321         errcode_t       retval;
1322         int             j, to_move, moved;
1323
1324         max_groups = fs->group_desc_count;
1325         if (max_groups > rfs->old_fs->group_desc_count)
1326                 max_groups = rfs->old_fs->group_desc_count;
1327
1328         size = fs->blocksize * fs->inode_blocks_per_group;
1329         if (!rfs->itable_buf) {
1330                 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1331                 if (retval)
1332                         return retval;
1333         }
1334
1335         /*
1336          * Figure out how many inode tables we need to move
1337          */
1338         to_move = moved = 0;
1339         for (i=0; i < max_groups; i++)
1340                 if (rfs->old_fs->group_desc[i].bg_inode_table !=
1341                     fs->group_desc[i].bg_inode_table)
1342                         to_move++;
1343
1344         if (to_move == 0)
1345                 return 0;
1346
1347         if (rfs->progress) {
1348                 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1349                                        0, to_move);
1350                 if (retval)
1351                         goto errout;
1352         }
1353
1354         rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1355
1356         for (i=0; i < max_groups; i++) {
1357                 old_blk = rfs->old_fs->group_desc[i].bg_inode_table;
1358                 new_blk = fs->group_desc[i].bg_inode_table;
1359                 diff = new_blk - old_blk;
1360
1361 #ifdef RESIZE2FS_DEBUG
1362                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1363                         printf("Itable move group %d block %u->%u (diff %d)\n",
1364                                i, old_blk, new_blk, diff);
1365 #endif
1366
1367                 if (!diff)
1368                         continue;
1369
1370                 retval = io_channel_read_blk(fs->io, old_blk,
1371                                              fs->inode_blocks_per_group,
1372                                              rfs->itable_buf);
1373                 if (retval)
1374                         goto errout;
1375                 /*
1376                  * The end of the inode table segment often contains
1377                  * all zeros, and we're often only moving the inode
1378                  * table down a block or two.  If so, we can optimize
1379                  * things by not rewriting blocks that we know to be zero
1380                  * already.
1381                  */
1382                 for (cp = rfs->itable_buf+size, n=0; n < size; n++, cp--)
1383                         if (*cp)
1384                                 break;
1385                 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1386 #ifdef RESIZE2FS_DEBUG
1387                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1388                         printf("%d blocks of zeros...\n", n);
1389 #endif
1390                 num = fs->inode_blocks_per_group;
1391                 if (n > diff)
1392                         num -= n;
1393
1394                 retval = io_channel_write_blk(fs->io, new_blk,
1395                                               num, rfs->itable_buf);
1396                 if (retval) {
1397                         io_channel_write_blk(fs->io, old_blk,
1398                                              num, rfs->itable_buf);
1399                         goto errout;
1400                 }
1401                 if (n > diff) {
1402                         retval = io_channel_write_blk(fs->io,
1403                               old_blk + fs->inode_blocks_per_group,
1404                               diff, (rfs->itable_buf +
1405                                      (fs->inode_blocks_per_group - diff) *
1406                                      fs->blocksize));
1407                         if (retval)
1408                                 goto errout;
1409                 }
1410
1411                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
1412                      j < fs->inode_blocks_per_group ; j++, blk++)
1413                         ext2fs_unmark_block_bitmap(fs->block_map, blk);
1414
1415                 rfs->old_fs->group_desc[i].bg_inode_table = new_blk;
1416                 ext2fs_mark_super_dirty(rfs->old_fs);
1417                 ext2fs_flush(rfs->old_fs);
1418
1419                 if (rfs->progress) {
1420                         retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1421                                                ++moved, to_move);
1422                         if (retval)
1423                                 goto errout;
1424                 }
1425         }
1426         mark_table_blocks(fs, fs->block_map);
1427         ext2fs_flush(fs);
1428 #ifdef RESIZE2FS_DEBUG
1429         if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1430                 printf("Inode table move finished.\n");
1431 #endif
1432         return 0;
1433
1434 errout:
1435         return retval;
1436 }
1437
1438 /*
1439  * Fix the resize inode
1440  */
1441 static errcode_t fix_resize_inode(ext2_filsys fs)
1442 {
1443         struct ext2_inode       inode;
1444         errcode_t               retval;
1445         char *                  block_buf;
1446
1447         if (!(fs->super->s_feature_compat &
1448               EXT2_FEATURE_COMPAT_RESIZE_INODE))
1449                 return 0;
1450
1451         retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1452         if (retval) goto errout;
1453
1454         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1455         if (retval) goto errout;
1456
1457         inode.i_blocks = fs->blocksize/512;
1458
1459         retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1460         if (retval) goto errout;
1461
1462         if (!inode.i_block[EXT2_DIND_BLOCK]) {
1463                 /*
1464                  * Avoid zeroing out block #0; that's rude.  This
1465                  * should never happen anyway since the filesystem
1466                  * should be fsck'ed and we assume it is consistent.
1467                  */
1468                 fprintf(stderr,
1469                         _("Should never happen: resize inode corrupt!\n"));
1470                 exit(1);
1471         }
1472
1473         memset(block_buf, 0, fs->blocksize);
1474
1475         retval = io_channel_write_blk(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1476                                       1, block_buf);
1477         if (retval) goto errout;
1478
1479         retval = ext2fs_create_resize_inode(fs);
1480         if (retval)
1481                 goto errout;
1482
1483 errout:
1484         if (block_buf)
1485                 ext2fs_free_mem(&block_buf);
1486         return retval;
1487 }
1488
1489 /*
1490  * Finally, recalculate the summary information
1491  */
1492 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1493 {
1494         blk_t           blk;
1495         ext2_ino_t      ino;
1496         unsigned int    group = 0;
1497         unsigned int    count = 0;
1498         int             total_free = 0;
1499         int             group_free = 0;
1500
1501         /*
1502          * First calculate the block statistics
1503          */
1504         for (blk = fs->super->s_first_data_block;
1505              blk < fs->super->s_blocks_count; blk++) {
1506                 if (!ext2fs_fast_test_block_bitmap(fs->block_map, blk)) {
1507                         group_free++;
1508                         total_free++;
1509                 }
1510                 count++;
1511                 if ((count == fs->super->s_blocks_per_group) ||
1512                     (blk == fs->super->s_blocks_count-1)) {
1513                         fs->group_desc[group++].bg_free_blocks_count =
1514                                 group_free;
1515                         count = 0;
1516                         group_free = 0;
1517                 }
1518         }
1519         fs->super->s_free_blocks_count = total_free;
1520
1521         /*
1522          * Next, calculate the inode statistics
1523          */
1524         group_free = 0;
1525         total_free = 0;
1526         count = 0;
1527         group = 0;
1528         for (ino = 1; ino <= fs->super->s_inodes_count; ino++) {
1529                 if (!ext2fs_fast_test_inode_bitmap(fs->inode_map, ino)) {
1530                         group_free++;
1531                         total_free++;
1532                 }
1533                 count++;
1534                 if ((count == fs->super->s_inodes_per_group) ||
1535                     (ino == fs->super->s_inodes_count)) {
1536                         fs->group_desc[group++].bg_free_inodes_count =
1537                                 group_free;
1538                         count = 0;
1539                         group_free = 0;
1540                 }
1541         }
1542         fs->super->s_free_inodes_count = total_free;
1543         ext2fs_mark_super_dirty(fs);
1544         return 0;
1545 }