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                 if (fs->desc_blocks > rfs->old_fs->desc_blocks)
 285                         memset((char *) fs->group_desc +
 286                                (rfs->old_fs->desc_blocks * fs->blocksize), 0,
 287                                (fs->desc_blocks - rfs->old_fs->desc_blocks) *
 288                                fs->blocksize);
 289         }
 290
 291         /*
 292          * Check to make sure there are enough inodes
 293          */
 294         if ((rfs->old_fs->super->s_inodes_count -
 295              rfs->old_fs->super->s_free_inodes_count) >
 296             rfs->new_fs->super->s_inodes_count) {
 297                 retval = ENOSPC;
 298                 goto errout;
 299         }
 300
 301         /*
 302          * If the resize_inode feature is set, and we are changing the
 303          * number of descriptor blocks, then adjust
 304          * s_reserved_gdt_blocks if possible to avoid needing to move
 305          * the inode table either now or in the future.
 306          */
 307         if ((fs->super->s_feature_compat &
 308              EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
 309             (rfs->old_fs->desc_blocks != fs->desc_blocks)) {
 310                 int new;
 311
 312                 new = ((int) fs->super->s_reserved_gdt_blocks) +
 313                         (rfs->old_fs->desc_blocks - fs->desc_blocks);
 314                 if (new < 0)
 315                         new = 0;
 316                 if (new > fs->blocksize/4)
 317                         new = fs->blocksize/4;
 318                 fs->super->s_reserved_gdt_blocks = new;
 319                 if (new == 0)
 320                         fs->super->s_feature_compat &=
 321                                 ~EXT2_FEATURE_COMPAT_RESIZE_INODE;
 322         }
 323
 324         /*
 325          * If we are shrinking the number block groups, we're done and
 326          * can exit now.
 327          */
 328         if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
 329                 retval = 0;
 330                 goto errout;
 331         }
 332         /*
 333          * Fix the count of the last (old) block group
 334          */
 335         old_numblocks = (rfs->old_fs->super->s_blocks_count -
 336                          rfs->old_fs->super->s_first_data_block) %
 337                                  rfs->old_fs->super->s_blocks_per_group;
 338         if (!old_numblocks)
 339                 old_numblocks = rfs->old_fs->super->s_blocks_per_group;
 340         if (rfs->old_fs->group_desc_count == fs->group_desc_count) {
 341                 numblocks = (rfs->new_fs->super->s_blocks_count -
 342                              rfs->new_fs->super->s_first_data_block) %
 343                                      rfs->new_fs->super->s_blocks_per_group;
 344                 if (!numblocks)
 345                         numblocks = rfs->new_fs->super->s_blocks_per_group;
 346         } else
 347                 numblocks = rfs->new_fs->super->s_blocks_per_group;
 348         i = rfs->old_fs->group_desc_count - 1;
 349         fs->group_desc[i].bg_free_blocks_count += (numblocks-old_numblocks);
 350
 351         /*
 352          * If the number of block groups is staying the same, we're
 353          * done and can exit now.  (If the number block groups is
 354          * shrinking, we had exited earlier.)
 355          */
 356         if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
 357                 retval = 0;
 358                 goto errout;
 359         }
 360         /*
 361          * Initialize the new block group descriptors
 362          */
 363         retval = ext2fs_get_mem(fs->blocksize * fs->inode_blocks_per_group,
 364                                 &rfs->itable_buf);
 365         if (retval)
 366                 goto errout;
 367
 368         memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
 369         group_block = fs->super->s_first_data_block +
 370                 rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
 371
 372         adj = rfs->old_fs->group_desc_count;
 373         max_group = fs->group_desc_count - adj;
 374         if (rfs->progress) {
 375                 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 376                                        0, max_group);
 377                 if (retval)
 378                         goto errout;
 379         }
 380         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 381                 old_desc_blocks = fs->super->s_first_meta_bg;
 382         else
 383                 old_desc_blocks = fs->desc_blocks +
 384                         fs->super->s_reserved_gdt_blocks;
 385         for (i = rfs->old_fs->group_desc_count;
 386              i < fs->group_desc_count; i++) {
 387                 memset(&fs->group_desc[i], 0,
 388                        sizeof(struct ext2_group_desc));
 389                 adjblocks = 0;
 390
 391                 if (i == fs->group_desc_count-1) {
 392                         numblocks = (fs->super->s_blocks_count -
 393                                      fs->super->s_first_data_block) %
 394                                              fs->super->s_blocks_per_group;
 395                         if (!numblocks)
 396                                 numblocks = fs->super->s_blocks_per_group;
 397                 } else
 398                         numblocks = fs->super->s_blocks_per_group;
 399
 400                 has_super = ext2fs_bg_has_super(fs, i);
 401                 if (has_super) {
 402                         ext2fs_mark_block_bitmap(fs->block_map, group_block);
 403                         adjblocks++;
 404                 }
 405                 meta_bg_size = (fs->blocksize /
 406                                 sizeof (struct ext2_group_desc));
 407                 meta_bg = i / meta_bg_size;
 408                 if (!(fs->super->s_feature_incompat &
 409                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 410                     (meta_bg < fs->super->s_first_meta_bg)) {
 411                         if (has_super) {
 412                                 for (j=0; j < old_desc_blocks; j++)
 413                                         ext2fs_mark_block_bitmap(fs->block_map,
 414                                                          group_block + 1 + j);
 415                                 adjblocks += old_desc_blocks;
 416                         }
 417                 } else {
 418                         if (has_super)
 419                                 has_super = 1;
 420                         if (((i % meta_bg_size) == 0) ||
 421                             ((i % meta_bg_size) == 1) ||
 422                             ((i % meta_bg_size) == (meta_bg_size-1)))
 423                                 ext2fs_mark_block_bitmap(fs->block_map,
 424                                                  group_block + has_super);
 425                 }
 426
 427                 adjblocks += 2 + fs->inode_blocks_per_group;
 428
 429                 numblocks -= adjblocks;
 430                 fs->super->s_free_blocks_count -= adjblocks;
 431                 fs->super->s_free_inodes_count +=
 432                         fs->super->s_inodes_per_group;
 433                 fs->group_desc[i].bg_free_blocks_count = numblocks;
 434                 fs->group_desc[i].bg_free_inodes_count =
 435                         fs->super->s_inodes_per_group;
 436                 fs->group_desc[i].bg_used_dirs_count = 0;
 437
 438                 retval = ext2fs_allocate_group_table(fs, i, 0);
 439                 if (retval) goto errout;
 440
 441                 /*
 442                  * Write out the new inode table
 443                  */
 444                 retval = io_channel_write_blk(fs->io,
 445                                               fs->group_desc[i].bg_inode_table,
 446                                               fs->inode_blocks_per_group,
 447                                               rfs->itable_buf);
 448                 if (retval) goto errout;
 449
 450                 io_channel_flush(fs->io);
 451                 if (rfs->progress) {
 452                         retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 453                                                i - adj + 1, max_group);
 454                         if (retval)
 455                                 goto errout;
 456                 }
 457                 group_block += fs->super->s_blocks_per_group;
 458         }
 459         io_channel_flush(fs->io);
 460         retval = 0;
 461
 462 errout:
 463         return retval;
 464 }
 465
 466 /* --------------------------------------------------------------------
 467  *
 468  * Resize processing, phase 2.
 469  *
 470  * In this phase we adjust determine which blocks need to be moved, in
 471  * blocks_to_move().  We then copy the blocks to their ultimate new
 472  * destinations using block_mover().  Since we are copying blocks to
 473  * their new locations, again during this pass we can abort without
 474  * any problems.
 475  * --------------------------------------------------------------------
 476  */
 477
 478 /*
 479  * This helper function creates a block bitmap with all of the
 480  * filesystem meta-data blocks.
 481  */
 482 static errcode_t mark_table_blocks(ext2_filsys fs,
 483                                    ext2fs_block_bitmap bmap)
 484 {
 485         blk_t                   block, b;
 486         unsigned int            j;
 487         dgrp_t                  i;
 488         unsigned long           meta_bg_size;
 489         unsigned int            old_desc_blocks;
 490
 491         meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
 492         block = fs->super->s_first_data_block;
 493         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 494                 old_desc_blocks = fs->super->s_first_meta_bg;
 495         else
 496                 old_desc_blocks = fs->desc_blocks +
 497                         fs->super->s_reserved_gdt_blocks;
 498         for (i = 0; i < fs->group_desc_count; i++) {
 499                 ext2fs_reserve_super_and_bgd(fs, i, bmap);
 500
 501                 /*
 502                  * Mark the blocks used for the inode table
 503                  */
 504                 for (j = 0, b = fs->group_desc[i].bg_inode_table;
 505                      j < (unsigned int) fs->inode_blocks_per_group;
 506                      j++, b++)
 507                         ext2fs_mark_block_bitmap(bmap, b);
 508
 509                 /*
 510                  * Mark block used for the block bitmap
 511                  */
 512                 ext2fs_mark_block_bitmap(bmap,
 513                                          fs->group_desc[i].bg_block_bitmap);
 514
 515                 /*
 516                  * Mark block used for the inode bitmap
 517                  */
 518                 ext2fs_mark_block_bitmap(bmap,
 519                                          fs->group_desc[i].bg_inode_bitmap);
 520                 block += fs->super->s_blocks_per_group;
 521         }
 522         return 0;
 523 }
 524
 525 /*
 526  * This function checks to see if a particular block (either a
 527  * superblock or a block group descriptor) overlaps with an inode or
 528  * block bitmap block, or with the inode table.
 529  */
 530 static void mark_fs_metablock(ext2_resize_t rfs,
 531                               ext2fs_block_bitmap meta_bmap,
 532                               int group, blk_t blk)
 533 {
 534         ext2_filsys     fs = rfs->new_fs;
 535
 536         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 537         ext2fs_mark_block_bitmap(fs->block_map, blk);
 538
 539         /*
 540          * Check to see if we overlap with the inode or block bitmap,
 541          * or the inode tables.  If not, and the block is in use, then
 542          * mark it as a block to be moved.
 543          */
 544         if (IS_BLOCK_BM(fs, group, blk)) {
 545                 FS_BLOCK_BM(fs, group) = 0;
 546                 rfs->needed_blocks++;
 547         } else if (IS_INODE_BM(fs, group, blk)) {
 548                 FS_INODE_BM(fs, group) = 0;
 549                 rfs->needed_blocks++;
 550         } else if (IS_INODE_TB(fs, group, blk)) {
 551                 FS_INODE_TB(fs, group) = 0;
 552                 rfs->needed_blocks++;
 553         } else if (ext2fs_test_block_bitmap(rfs->old_fs->block_map, blk) &&
 554                    !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 555                 ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 556                 rfs->needed_blocks++;
 557         }
 558 }
 559
 560
 561 /*
 562  * This routine marks and unmarks reserved blocks in the new block
 563  * bitmap.  It also determines which blocks need to be moved and
 564  * places this information into the move_blocks bitmap.
 565  */
 566 static errcode_t blocks_to_move(ext2_resize_t rfs)
 567 {
 568         int             j, has_super;
 569         dgrp_t          i, max_groups;
 570         blk_t           blk, group_blk;
 571         unsigned long   old_blocks, new_blocks;
 572         unsigned int    meta_bg, meta_bg_size;
 573         errcode_t       retval;
 574         ext2_filsys     fs, old_fs;
 575         ext2fs_block_bitmap     meta_bmap;
 576
 577         fs = rfs->new_fs;
 578         old_fs = rfs->old_fs;
 579         if (old_fs->super->s_blocks_count > fs->super->s_blocks_count)
 580                 fs = rfs->old_fs;
 581
 582         retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
 583                                               &rfs->reserve_blocks);
 584         if (retval)
 585                 return retval;
 586
 587         retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
 588                                               &rfs->move_blocks);
 589         if (retval)
 590                 return retval;
 591
 592         retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
 593                                               &meta_bmap);
 594         if (retval)
 595                 return retval;
 596
 597         retval = mark_table_blocks(old_fs, meta_bmap);
 598         if (retval)
 599                 return retval;
 600
 601         fs = rfs->new_fs;
 602
 603         /*
 604          * If we're shrinking the filesystem, we need to move all of
 605          * the blocks that don't fit any more
 606          */
 607         for (blk = fs->super->s_blocks_count;
 608              blk < old_fs->super->s_blocks_count; blk++) {
 609                 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 610                     !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 611                         ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 612                         rfs->needed_blocks++;
 613                 }
 614                 ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 615         }
 616
 617         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
 618                 old_blocks = old_fs->super->s_first_meta_bg;
 619                 new_blocks = fs->super->s_first_meta_bg;
 620         } else {
 621                 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
 622                 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
 623         }
 624
 625         if (old_blocks == new_blocks) {
 626                 retval = 0;
 627                 goto errout;
 628         }
 629
 630         max_groups = fs->group_desc_count;
 631         if (max_groups > old_fs->group_desc_count)
 632                 max_groups = old_fs->group_desc_count;
 633         group_blk = old_fs->super->s_first_data_block;
 634         /*
 635          * If we're reducing the number of descriptor blocks, this
 636          * makes life easy.  :-)   We just have to mark some extra
 637          * blocks as free.
 638          */
 639         if (old_blocks > new_blocks) {
 640                 for (i = 0; i < max_groups; i++) {
 641                         if (!ext2fs_bg_has_super(fs, i)) {
 642                                 group_blk += fs->super->s_blocks_per_group;
 643                                 continue;
 644                         }
 645                         for (blk = group_blk+1+new_blocks;
 646                              blk < group_blk+1+old_blocks; blk++) {
 647                                 ext2fs_unmark_block_bitmap(fs->block_map,
 648                                                            blk);
 649                                 rfs->needed_blocks--;
 650                         }
 651                         group_blk += fs->super->s_blocks_per_group;
 652                 }
 653                 retval = 0;
 654                 goto errout;
 655         }
 656         /*
 657          * If we're increasing the number of descriptor blocks, life
 658          * gets interesting....
 659          */
 660         meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
 661         for (i = 0; i < max_groups; i++) {
 662                 has_super = ext2fs_bg_has_super(fs, i);
 663                 if (has_super)
 664                         mark_fs_metablock(rfs, meta_bmap, i, group_blk);
 665
 666                 meta_bg = i / meta_bg_size;
 667                 if (!(fs->super->s_feature_incompat &
 668                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 669                     (meta_bg < fs->super->s_first_meta_bg)) {
 670                         if (has_super) {
 671                                 for (blk = group_blk+1;
 672                                      blk < group_blk + 1 + new_blocks; blk++)
 673                                         mark_fs_metablock(rfs, meta_bmap,
 674                                                           i, blk);
 675                         }
 676                 } else {
 677                         if (has_super)
 678                                 has_super = 1;
 679                         if (((i % meta_bg_size) == 0) ||
 680                             ((i % meta_bg_size) == 1) ||
 681                             ((i % meta_bg_size) == (meta_bg_size-1)))
 682                                 mark_fs_metablock(rfs, meta_bmap, i,
 683                                                   group_blk + has_super);
 684                 }
 685
 686                 if (fs->group_desc[i].bg_inode_table &&
 687                     fs->group_desc[i].bg_inode_bitmap &&
 688                     fs->group_desc[i].bg_block_bitmap)
 689                         goto next_group;
 690
 691                 /*
 692                  * Reserve the existing meta blocks that we know
 693                  * aren't to be moved.
 694                  */
 695                 if (fs->group_desc[i].bg_block_bitmap)
 696                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 697                                  fs->group_desc[i].bg_block_bitmap);
 698                 if (fs->group_desc[i].bg_inode_bitmap)
 699                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 700                                  fs->group_desc[i].bg_inode_bitmap);
 701                 if (fs->group_desc[i].bg_inode_table)
 702                         for (blk = fs->group_desc[i].bg_inode_table, j=0;
 703                              j < fs->inode_blocks_per_group ; j++, blk++)
 704                                 ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 705                                                          blk);
 706
 707                 /*
 708                  * Allocate the missing data structures
 709                  */
 710                 retval = ext2fs_allocate_group_table(fs, i,
 711                                                      rfs->reserve_blocks);
 712                 if (retval)
 713                         goto errout;
 714
 715                 /*
 716                  * For those structures that have changed, we need to
 717                  * do bookkeepping.
 718                  */
 719                 if (FS_BLOCK_BM(old_fs, i) !=
 720                     (blk = FS_BLOCK_BM(fs, i))) {
 721                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 722                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 723                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 724                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 725                                                          blk);
 726                 }
 727                 if (FS_INODE_BM(old_fs, i) !=
 728                     (blk = FS_INODE_BM(fs, i))) {
 729                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 730                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 731                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 732                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 733                                                          blk);
 734                 }
 735
 736                 /*
 737                  * The inode table, if we need to relocate it, is
 738                  * handled specially.  We have to reserve the blocks
 739                  * for both the old and the new inode table, since we
 740                  * can't have the inode table be destroyed during the
 741                  * block relocation phase.
 742                  */
 743                 if (FS_INODE_TB(fs, i) == FS_INODE_TB(old_fs, i))
 744                         goto next_group; /* inode table not moved */
 745
 746                 rfs->needed_blocks += fs->inode_blocks_per_group;
 747
 748                 /*
 749                  * Mark the new inode table as in use in the new block
 750                  * allocation bitmap, and move any blocks that might
 751                  * be necessary.
 752                  */
 753                 for (blk = fs->group_desc[i].bg_inode_table, j=0;
 754                      j < fs->inode_blocks_per_group ; j++, blk++) {
 755                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 756                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 757                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 758                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 759                                                          blk);
 760                 }
 761
 762                 /*
 763                  * Make sure the old inode table is reserved in the
 764                  * block reservation bitmap.
 765                  */
 766                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
 767                      j < fs->inode_blocks_per_group ; j++, blk++)
 768                         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 769
 770         next_group:
 771                 group_blk += rfs->new_fs->super->s_blocks_per_group;
 772         }
 773         retval = 0;
 774
 775 errout:
 776         if (meta_bmap)
 777                 ext2fs_free_block_bitmap(meta_bmap);
 778
 779         return retval;
 780 }
 781
 782 /*
 783  * This helper function tries to allocate a new block.  We try to
 784  * avoid hitting the original group descriptor blocks at least at
 785  * first, since we want to make it possible to recover from a badly
 786  * aborted resize operation as much as possible.
 787  *
 788  * In the future, I may further modify this routine to balance out
 789  * where we get the new blocks across the various block groups.
 790  * Ideally we would allocate blocks that corresponded with the block
 791  * group of the containing inode, and keep contiguous blocks
 792  * together.  However, this very difficult to do efficiently, since we
 793  * don't have the necessary information up front.
 794  */
 795
 796 #define AVOID_OLD       1
 797 #define DESPERATION     2
 798
 799 static void init_block_alloc(ext2_resize_t rfs)
 800 {
 801         rfs->alloc_state = AVOID_OLD;
 802         rfs->new_blk = rfs->new_fs->super->s_first_data_block;
 803 #if 0
 804         /* HACK for testing */
 805         if (rfs->new_fs->super->s_blocks_count >
 806             rfs->old_fs->super->s_blocks_count)
 807                 rfs->new_blk = rfs->old_fs->super->s_blocks_count;
 808 #endif
 809 }
 810
 811 static blk_t get_new_block(ext2_resize_t rfs)
 812 {
 813         ext2_filsys     fs = rfs->new_fs;
 814
 815         while (1) {
 816                 if (rfs->new_blk >= fs->super->s_blocks_count) {
 817                         if (rfs->alloc_state == DESPERATION)
 818                                 return 0;
 819
 820 #ifdef RESIZE2FS_DEBUG
 821                         if (rfs->flags & RESIZE_DEBUG_BMOVE)
 822                                 printf("Going into desperation mode "
 823                                        "for block allocations\n");
 824 #endif
 825                         rfs->alloc_state = DESPERATION;
 826                         rfs->new_blk = fs->super->s_first_data_block;
 827                         continue;
 828                 }
 829                 if (ext2fs_test_block_bitmap(fs->block_map, rfs->new_blk) ||
 830                     ext2fs_test_block_bitmap(rfs->reserve_blocks,
 831                                              rfs->new_blk) ||
 832                     ((rfs->alloc_state == AVOID_OLD) &&
 833                      (rfs->new_blk < rfs->old_fs->super->s_blocks_count) &&
 834                      ext2fs_test_block_bitmap(rfs->old_fs->block_map,
 835                                               rfs->new_blk))) {
 836                         rfs->new_blk++;
 837                         continue;
 838                 }
 839                 return rfs->new_blk;
 840         }
 841 }
 842
 843 static errcode_t block_mover(ext2_resize_t rfs)
 844 {
 845         blk_t                   blk, old_blk, new_blk;
 846         ext2_filsys             fs = rfs->new_fs;
 847         ext2_filsys             old_fs = rfs->old_fs;
 848         errcode_t               retval;
 849         int                     size, c;
 850         int                     to_move, moved;
 851         ext2_badblocks_list     badblock_list = 0;
 852         int                     bb_modified = 0;
 853
 854         retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
 855         if (retval)
 856                 return retval;
 857
 858         new_blk = fs->super->s_first_data_block;
 859         if (!rfs->itable_buf) {
 860                 retval = ext2fs_get_mem(fs->blocksize *
 861                                         fs->inode_blocks_per_group,
 862                                         &rfs->itable_buf);
 863                 if (retval)
 864                         return retval;
 865         }
 866         retval = ext2fs_create_extent_table(&rfs->bmap, 0);
 867         if (retval)
 868                 return retval;
 869
 870         /*
 871          * The first step is to figure out where all of the blocks
 872          * will go.
 873          */
 874         to_move = moved = 0;
 875         init_block_alloc(rfs);
 876         for (blk = old_fs->super->s_first_data_block;
 877              blk < old_fs->super->s_blocks_count; blk++) {
 878                 if (!ext2fs_test_block_bitmap(old_fs->block_map, blk))
 879                         continue;
 880                 if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk))
 881                         continue;
 882                 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
 883                         ext2fs_badblocks_list_del(badblock_list, blk);
 884                         bb_modified++;
 885                         continue;
 886                 }
 887
 888                 new_blk = get_new_block(rfs);
 889                 if (!new_blk) {
 890                         retval = ENOSPC;
 891                         goto errout;
 892                 }
 893                 ext2fs_mark_block_bitmap(fs->block_map, new_blk);
 894                 ext2fs_add_extent_entry(rfs->bmap, blk, new_blk);
 895                 to_move++;
 896         }
 897
 898         if (to_move == 0) {
 899                 if (rfs->bmap) {
 900                         ext2fs_free_extent_table(rfs->bmap);
 901                         rfs->bmap = 0;
 902                 }
 903                 retval = 0;
 904                 goto errout;
 905         }
 906
 907         /*
 908          * Step two is to actually move the blocks
 909          */
 910         retval =  ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
 911         if (retval) goto errout;
 912
 913         if (rfs->progress) {
 914                 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
 915                                          0, to_move);
 916                 if (retval)
 917                         goto errout;
 918         }
 919         while (1) {
 920                 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
 921                 if (retval) goto errout;
 922                 if (!size)
 923                         break;
 924 #ifdef RESIZE2FS_DEBUG
 925                 if (rfs->flags & RESIZE_DEBUG_BMOVE)
 926                         printf("Moving %d blocks %u->%u\n",
 927                                size, old_blk, new_blk);
 928 #endif
 929                 do {
 930                         c = size;
 931                         if (c > fs->inode_blocks_per_group)
 932                                 c = fs->inode_blocks_per_group;
 933                         retval = io_channel_read_blk(fs->io, old_blk, c,
 934                                                      rfs->itable_buf);
 935                         if (retval) goto errout;
 936                         retval = io_channel_write_blk(fs->io, new_blk, c,
 937                                                       rfs->itable_buf);
 938                         if (retval) goto errout;
 939                         size -= c;
 940                         new_blk += c;
 941                         old_blk += c;
 942                         moved += c;
 943                         if (rfs->progress) {
 944                                 io_channel_flush(fs->io);
 945                                 retval = (rfs->progress)(rfs,
 946                                                 E2_RSZ_BLOCK_RELOC_PASS,
 947                                                 moved, to_move);
 948                                 if (retval)
 949                                         goto errout;
 950                         }
 951                 } while (size > 0);
 952                 io_channel_flush(fs->io);
 953         }
 954
 955 errout:
 956         if (badblock_list) {
 957                 if (!retval && bb_modified)
 958                         retval = ext2fs_update_bb_inode(old_fs,
 959                                                         badblock_list);
 960                 ext2fs_badblocks_list_free(badblock_list);
 961         }
 962         return retval;
 963 }
 964
 965
 966 /* --------------------------------------------------------------------
 967  *
 968  * Resize processing, phase 3
 969  *
 970  * --------------------------------------------------------------------
 971  */
 972
 973
 974 struct process_block_struct {
 975         ext2_resize_t           rfs;
 976         ext2_ino_t              ino;
 977         struct ext2_inode *     inode;
 978         errcode_t               error;
 979         int                     is_dir;
 980         int                     changed;
 981 };
 982
 983 static int process_block(ext2_filsys fs, blk_t  *block_nr,
 984                          e2_blkcnt_t blockcnt,
 985                          blk_t ref_block EXT2FS_ATTR((unused)),
 986                          int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
 987 {
 988         struct process_block_struct *pb;
 989         errcode_t       retval;
 990         blk_t           block, new_block;
 991         int             ret = 0;
 992
 993         pb = (struct process_block_struct *) priv_data;
 994         block = *block_nr;
 995         if (pb->rfs->bmap) {
 996                 new_block = ext2fs_extent_translate(pb->rfs->bmap, block);
 997                 if (new_block) {
 998                         *block_nr = new_block;
 999                         ret |= BLOCK_CHANGED;
1000                         pb->changed = 1;
1001 #ifdef RESIZE2FS_DEBUG
1002                         if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1003                                 printf("ino=%u, blockcnt=%lld, %u->%u\n",
1004                                        pb->ino, blockcnt, block, new_block);
1005 #endif
1006                         block = new_block;
1007                 }
1008         }
1009         if (pb->is_dir) {
1010                 retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
1011                                               block, (int) blockcnt);
1012                 if (retval) {
1013                         pb->error = retval;
1014                         ret |= BLOCK_ABORT;
1015                 }
1016         }
1017         return ret;
1018 }
1019
1020 /*
1021  * Progress callback
1022  */
1023 static errcode_t progress_callback(ext2_filsys fs,
1024                                    ext2_inode_scan scan EXT2FS_ATTR((unused)),
1025                                    dgrp_t group, void * priv_data)
1026 {
1027         ext2_resize_t rfs = (ext2_resize_t) priv_data;
1028         errcode_t               retval;
1029
1030         /*
1031          * This check is to protect against old ext2 libraries.  It
1032          * shouldn't be needed against new libraries.
1033          */
1034         if ((group+1) == 0)
1035                 return 0;
1036
1037         if (rfs->progress) {
1038                 io_channel_flush(fs->io);
1039                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1040                                          group+1, fs->group_desc_count);
1041                 if (retval)
1042                         return retval;
1043         }
1044
1045         return 0;
1046 }
1047
1048 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1049 {
1050         struct process_block_struct     pb;
1051         ext2_ino_t              ino, new_inode;
1052         struct ext2_inode       inode;
1053         ext2_inode_scan         scan = NULL;
1054         errcode_t               retval;
1055         int                     group;
1056         char                    *block_buf = 0;
1057         ext2_ino_t              start_to_move;
1058         blk_t                   orig_size, new_block;
1059
1060         if ((rfs->old_fs->group_desc_count <=
1061              rfs->new_fs->group_desc_count) &&
1062             !rfs->bmap)
1063                 return 0;
1064
1065         /*
1066          * Save the original size of the old filesystem, and
1067          * temporarily set the size to be the new size if the new size
1068          * is larger.  We need to do this to avoid catching an error
1069          * by the block iterator routines
1070          */
1071         orig_size = rfs->old_fs->super->s_blocks_count;
1072         if (orig_size < rfs->new_fs->super->s_blocks_count)
1073                 rfs->old_fs->super->s_blocks_count =
1074                         rfs->new_fs->super->s_blocks_count;
1075
1076         retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1077         if (retval) goto errout;
1078
1079         retval = ext2fs_init_dblist(rfs->old_fs, 0);
1080         if (retval) goto errout;
1081         retval = ext2fs_get_mem(rfs->old_fs->blocksize * 3, &block_buf);
1082         if (retval) goto errout;
1083
1084         start_to_move = (rfs->new_fs->group_desc_count *
1085                          rfs->new_fs->super->s_inodes_per_group);
1086
1087         if (rfs->progress) {
1088                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1089                                          0, rfs->old_fs->group_desc_count);
1090                 if (retval)
1091                         goto errout;
1092         }
1093         ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1094         pb.rfs = rfs;
1095         pb.inode = &inode;
1096         pb.error = 0;
1097         new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1098         /*
1099          * First, copy all of the inodes that need to be moved
1100          * elsewhere in the inode table
1101          */
1102         while (1) {
1103                 retval = ext2fs_get_next_inode(scan, &ino, &inode);
1104                 if (retval) goto errout;
1105                 if (!ino)
1106                         break;
1107
1108                 if (inode.i_links_count == 0 && ino != EXT2_RESIZE_INO)
1109                         continue; /* inode not in use */
1110
1111                 pb.is_dir = LINUX_S_ISDIR(inode.i_mode);
1112                 pb.changed = 0;
1113
1114                 if (inode.i_file_acl && rfs->bmap) {
1115                         new_block = ext2fs_extent_translate(rfs->bmap,
1116                                                             inode.i_file_acl);
1117                         if (new_block) {
1118                                 inode.i_file_acl = new_block;
1119                                 retval = ext2fs_write_inode(rfs->old_fs,
1120                                                             ino, &inode);
1121                                 if (retval) goto errout;
1122                         }
1123                 }
1124
1125                 if (ext2fs_inode_has_valid_blocks(&inode) &&
1126                     (rfs->bmap || pb.is_dir)) {
1127                         pb.ino = ino;
1128                         retval = ext2fs_block_iterate2(rfs->old_fs,
1129                                                        ino, 0, block_buf,
1130                                                        process_block, &pb);
1131                         if (retval)
1132                                 goto errout;
1133                         if (pb.error) {
1134                                 retval = pb.error;
1135                                 goto errout;
1136                         }
1137                 }
1138
1139                 if (ino <= start_to_move)
1140                         continue; /* Don't need to move it. */
1141
1142                 /*
1143                  * Find a new inode
1144                  */
1145                 while (1) {
1146                         if (!ext2fs_test_inode_bitmap(rfs->new_fs->inode_map,
1147                                                       new_inode))
1148                                 break;
1149                         new_inode++;
1150                         if (new_inode > rfs->new_fs->super->s_inodes_count) {
1151                                 retval = ENOSPC;
1152                                 goto errout;
1153                         }
1154                 }
1155                 ext2fs_mark_inode_bitmap(rfs->new_fs->inode_map, new_inode);
1156                 if (pb.changed) {
1157                         /* Get the new version of the inode */
1158                         retval = ext2fs_read_inode(rfs->old_fs, ino, &inode);
1159                         if (retval) goto errout;
1160                 }
1161                 inode.i_ctime = time(0);
1162                 retval = ext2fs_write_inode(rfs->old_fs, new_inode, &inode);
1163                 if (retval) goto errout;
1164
1165                 group = (new_inode-1) / EXT2_INODES_PER_GROUP(rfs->new_fs->super);
1166                 if (LINUX_S_ISDIR(inode.i_mode))
1167                         rfs->new_fs->group_desc[group].bg_used_dirs_count++;
1168
1169 #ifdef RESIZE2FS_DEBUG
1170                 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1171                         printf("Inode moved %u->%u\n", ino, new_inode);
1172 #endif
1173                 if (!rfs->imap) {
1174                         retval = ext2fs_create_extent_table(&rfs->imap, 0);
1175                         if (retval)
1176                                 goto errout;
1177                 }
1178                 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1179         }
1180         io_channel_flush(rfs->old_fs->io);
1181
1182 errout:
1183         rfs->old_fs->super->s_blocks_count = orig_size;
1184         if (rfs->bmap) {
1185                 ext2fs_free_extent_table(rfs->bmap);
1186                 rfs->bmap = 0;
1187         }
1188         if (scan)
1189                 ext2fs_close_inode_scan(scan);
1190         if (block_buf)
1191                 ext2fs_free_mem(&block_buf);
1192         return retval;
1193 }
1194
1195 /* --------------------------------------------------------------------
1196  *
1197  * Resize processing, phase 4.
1198  *
1199  * --------------------------------------------------------------------
1200  */
1201
1202 struct istruct {
1203         ext2_resize_t rfs;
1204         errcode_t       err;
1205         unsigned long   max_dirs;
1206         int             num;
1207 };
1208
1209 static int check_and_change_inodes(ext2_ino_t dir,
1210                                    int entry EXT2FS_ATTR((unused)),
1211                                    struct ext2_dir_entry *dirent, int offset,
1212                                    int  blocksize EXT2FS_ATTR((unused)),
1213                                    char *buf EXT2FS_ATTR((unused)),
1214                                    void *priv_data)
1215 {
1216         struct istruct *is = (struct istruct *) priv_data;
1217         struct ext2_inode       inode;
1218         ext2_ino_t              new_inode;
1219         errcode_t               retval;
1220
1221         if (is->rfs->progress && offset == 0) {
1222                 io_channel_flush(is->rfs->old_fs->io);
1223                 is->err = (is->rfs->progress)(is->rfs,
1224                                               E2_RSZ_INODE_REF_UPD_PASS,
1225                                               ++is->num, is->max_dirs);
1226                 if (is->err)
1227                         return DIRENT_ABORT;
1228         }
1229
1230         if (!dirent->inode)
1231                 return 0;
1232
1233         new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1234
1235         if (!new_inode)
1236                 return 0;
1237 #ifdef RESIZE2FS_DEBUG
1238         if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1239                 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1240                        dir, dirent->name_len&0xFF, dirent->name,
1241                        dirent->inode, new_inode);
1242 #endif
1243
1244         dirent->inode = new_inode;
1245
1246         /* Update the directory mtime and ctime */
1247         retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1248         if (retval == 0) {
1249                 inode.i_mtime = inode.i_ctime = time(0);
1250                 ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1251         }
1252
1253         return DIRENT_CHANGED;
1254 }
1255
1256 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1257 {
1258         errcode_t               retval;
1259         struct istruct          is;
1260
1261         if (!rfs->imap)
1262                 return 0;
1263
1264         /*
1265          * Now, we iterate over all of the directories to update the
1266          * inode references
1267          */
1268         is.num = 0;
1269         is.max_dirs = ext2fs_dblist_count(rfs->old_fs->dblist);
1270         is.rfs = rfs;
1271         is.err = 0;
1272
1273         if (rfs->progress) {
1274                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1275                                          0, is.max_dirs);
1276                 if (retval)
1277                         goto errout;
1278         }
1279
1280         retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1281                                            DIRENT_FLAG_INCLUDE_EMPTY, 0,
1282                                            check_and_change_inodes, &is);
1283         if (retval)
1284                 goto errout;
1285         if (is.err) {
1286                 retval = is.err;
1287                 goto errout;
1288         }
1289
1290 errout:
1291         ext2fs_free_extent_table(rfs->imap);
1292         rfs->imap = 0;
1293         return retval;
1294 }
1295
1296
1297 /* --------------------------------------------------------------------
1298  *
1299  * Resize processing, phase 5.
1300  *
1301  * In this phase we actually move the inode table around, and then
1302  * update the summary statistics.  This is scary, since aborting here
1303  * will potentially scramble the filesystem.  (We are moving the
1304  * inode tables around in place, and so the potential for lost data,
1305  * or at the very least scrambling the mapping between filenames and
1306  * inode numbers is very high in case of a power failure here.)
1307  * --------------------------------------------------------------------
1308  */
1309
1310
1311 /*
1312  * A very scary routine --- this one moves the inode table around!!!
1313  *
1314  * After this you have to use the rfs->new_fs file handle to read and
1315  * write inodes.
1316  */
1317 static errcode_t move_itables(ext2_resize_t rfs)
1318 {
1319         int             n, num, size, diff;
1320         dgrp_t          i, max_groups;
1321         ext2_filsys     fs = rfs->new_fs;
1322         char            *cp;
1323         blk_t           old_blk, new_blk, blk;
1324         errcode_t       retval;
1325         int             j, to_move, moved;
1326
1327         max_groups = fs->group_desc_count;
1328         if (max_groups > rfs->old_fs->group_desc_count)
1329                 max_groups = rfs->old_fs->group_desc_count;
1330
1331         size = fs->blocksize * fs->inode_blocks_per_group;
1332         if (!rfs->itable_buf) {
1333                 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1334                 if (retval)
1335                         return retval;
1336         }
1337
1338         /*
1339          * Figure out how many inode tables we need to move
1340          */
1341         to_move = moved = 0;
1342         for (i=0; i < max_groups; i++)
1343                 if (rfs->old_fs->group_desc[i].bg_inode_table !=
1344                     fs->group_desc[i].bg_inode_table)
1345                         to_move++;
1346
1347         if (to_move == 0)
1348                 return 0;
1349
1350         if (rfs->progress) {
1351                 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1352                                        0, to_move);
1353                 if (retval)
1354                         goto errout;
1355         }
1356
1357         rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1358
1359         for (i=0; i < max_groups; i++) {
1360                 old_blk = rfs->old_fs->group_desc[i].bg_inode_table;
1361                 new_blk = fs->group_desc[i].bg_inode_table;
1362                 diff = new_blk - old_blk;
1363
1364 #ifdef RESIZE2FS_DEBUG
1365                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1366                         printf("Itable move group %d block %u->%u (diff %d)\n",
1367                                i, old_blk, new_blk, diff);
1368 #endif
1369
1370                 if (!diff)
1371                         continue;
1372
1373                 retval = io_channel_read_blk(fs->io, old_blk,
1374                                              fs->inode_blocks_per_group,
1375                                              rfs->itable_buf);
1376                 if (retval)
1377                         goto errout;
1378                 /*
1379                  * The end of the inode table segment often contains
1380                  * all zeros, and we're often only moving the inode
1381                  * table down a block or two.  If so, we can optimize
1382                  * things by not rewriting blocks that we know to be zero
1383                  * already.
1384                  */
1385                 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
1386                         if (*cp)
1387                                 break;
1388                 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1389 #ifdef RESIZE2FS_DEBUG
1390                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1391                         printf("%d blocks of zeros...\n", n);
1392 #endif
1393                 num = fs->inode_blocks_per_group;
1394                 if (n > diff)
1395                         num -= n;
1396
1397                 retval = io_channel_write_blk(fs->io, new_blk,
1398                                               num, rfs->itable_buf);
1399                 if (retval) {
1400                         io_channel_write_blk(fs->io, old_blk,
1401                                              num, rfs->itable_buf);
1402                         goto errout;
1403                 }
1404                 if (n > diff) {
1405                         retval = io_channel_write_blk(fs->io,
1406                               old_blk + fs->inode_blocks_per_group,
1407                               diff, (rfs->itable_buf +
1408                                      (fs->inode_blocks_per_group - diff) *
1409                                      fs->blocksize));
1410                         if (retval)
1411                                 goto errout;
1412                 }
1413
1414                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
1415                      j < fs->inode_blocks_per_group ; j++, blk++)
1416                         ext2fs_unmark_block_bitmap(fs->block_map, blk);
1417
1418                 rfs->old_fs->group_desc[i].bg_inode_table = new_blk;
1419                 ext2fs_mark_super_dirty(rfs->old_fs);
1420                 ext2fs_flush(rfs->old_fs);
1421
1422                 if (rfs->progress) {
1423                         retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1424                                                ++moved, to_move);
1425                         if (retval)
1426                                 goto errout;
1427                 }
1428         }
1429         mark_table_blocks(fs, fs->block_map);
1430         ext2fs_flush(fs);
1431 #ifdef RESIZE2FS_DEBUG
1432         if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1433                 printf("Inode table move finished.\n");
1434 #endif
1435         return 0;
1436
1437 errout:
1438         return retval;
1439 }
1440
1441 /*
1442  * Fix the resize inode
1443  */
1444 static errcode_t fix_resize_inode(ext2_filsys fs)
1445 {
1446         struct ext2_inode       inode;
1447         errcode_t               retval;
1448         char *                  block_buf;
1449
1450         if (!(fs->super->s_feature_compat &
1451               EXT2_FEATURE_COMPAT_RESIZE_INODE))
1452                 return 0;
1453
1454         retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1455         if (retval) goto errout;
1456
1457         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1458         if (retval) goto errout;
1459
1460         inode.i_blocks = fs->blocksize/512;
1461
1462         retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1463         if (retval) goto errout;
1464
1465         if (!inode.i_block[EXT2_DIND_BLOCK]) {
1466                 /*
1467                  * Avoid zeroing out block #0; that's rude.  This
1468                  * should never happen anyway since the filesystem
1469                  * should be fsck'ed and we assume it is consistent.
1470                  */
1471                 fprintf(stderr,
1472                         _("Should never happen: resize inode corrupt!\n"));
1473                 exit(1);
1474         }
1475
1476         memset(block_buf, 0, fs->blocksize);
1477
1478         retval = io_channel_write_blk(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1479                                       1, block_buf);
1480         if (retval) goto errout;
1481
1482         retval = ext2fs_create_resize_inode(fs);
1483         if (retval)
1484                 goto errout;
1485
1486 errout:
1487         if (block_buf)
1488                 ext2fs_free_mem(&block_buf);
1489         return retval;
1490 }
1491
1492 /*
1493  * Finally, recalculate the summary information
1494  */
1495 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1496 {
1497         blk_t           blk;
1498         ext2_ino_t      ino;
1499         unsigned int    group = 0;
1500         unsigned int    count = 0;
1501         int             total_free = 0;
1502         int             group_free = 0;
1503
1504         /*
1505          * First calculate the block statistics
1506          */
1507         for (blk = fs->super->s_first_data_block;
1508              blk < fs->super->s_blocks_count; blk++) {
1509                 if (!ext2fs_fast_test_block_bitmap(fs->block_map, blk)) {
1510                         group_free++;
1511                         total_free++;
1512                 }
1513                 count++;
1514                 if ((count == fs->super->s_blocks_per_group) ||
1515                     (blk == fs->super->s_blocks_count-1)) {
1516                         fs->group_desc[group++].bg_free_blocks_count =
1517                                 group_free;
1518                         count = 0;
1519                         group_free = 0;
1520                 }
1521         }
1522         fs->super->s_free_blocks_count = total_free;
1523
1524         /*
1525          * Next, calculate the inode statistics
1526          */
1527         group_free = 0;
1528         total_free = 0;
1529         count = 0;
1530         group = 0;
1531         for (ino = 1; ino <= fs->super->s_inodes_count; ino++) {
1532                 if (!ext2fs_fast_test_inode_bitmap(fs->inode_map, ino)) {
1533                         group_free++;
1534                         total_free++;
1535                 }
1536                 count++;
1537                 if ((count == fs->super->s_inodes_per_group) ||
1538                     (ino == fs->super->s_inodes_count)) {
1539                         fs->group_desc[group++].bg_free_inodes_count =
1540                                 group_free;
1541                         count = 0;
1542                         group_free = 0;
1543                 }
1544         }
1545         fs->super->s_free_inodes_count = total_free;
1546         ext2fs_mark_super_dirty(fs);
1547         return 0;
1548 }