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: %u/%u, 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         rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 142         retval = ext2fs_close(rfs->new_fs);
 143         if (retval)
 144                 goto errout;
 145
 146         rfs->flags = flags;
 147
 148         ext2fs_free(rfs->old_fs);
 149         if (rfs->itable_buf)
 150                 ext2fs_free_mem(&rfs->itable_buf);
 151         ext2fs_free_mem(&rfs);
 152
 153         return 0;
 154
 155 errout:
 156         if (rfs->new_fs)
 157                 ext2fs_free(rfs->new_fs);
 158         if (rfs->itable_buf)
 159                 ext2fs_free_mem(&rfs->itable_buf);
 160         ext2fs_free_mem(&rfs);
 161         return retval;
 162 }
 163
 164 /* --------------------------------------------------------------------
 165  *
 166  * Resize processing, phase 1.
 167  *
 168  * In this phase we adjust the in-memory superblock information, and
 169  * initialize any new parts of the inode table.  The new parts of the
 170  * inode table are created in virgin disk space, so we can abort here
 171  * without any side effects.
 172  * --------------------------------------------------------------------
 173  */
 174
 175 /*
 176  * This routine is shared by the online and offline resize routines.
 177  * All of the information which is adjusted in memory is done here.
 178  */
 179 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs, blk_t new_size)
 180 {
 181         errcode_t       retval;
 182         int             overhead = 0;
 183         int             rem;
 184         blk_t           blk, group_block;
 185         ext2_ino_t      real_end;
 186         int             adj, old_numblocks, numblocks, adjblocks;
 187         unsigned long   i, j, old_desc_blocks, max_group;
 188         unsigned int    meta_bg, meta_bg_size;
 189         int             has_super;
 190         unsigned long long new_inodes;  /* u64 to check for overflow */
 191
 192         fs->super->s_blocks_count = new_size;
 193
 194 retry:
 195         fs->group_desc_count = ext2fs_div_ceil(fs->super->s_blocks_count -
 196                                        fs->super->s_first_data_block,
 197                                        EXT2_BLOCKS_PER_GROUP(fs->super));
 198         if (fs->group_desc_count == 0)
 199                 return EXT2_ET_TOOSMALL;
 200         fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
 201                                           EXT2_DESC_PER_BLOCK(fs->super));
 202
 203         /*
 204          * Overhead is the number of bookkeeping blocks per group.  It
 205          * includes the superblock backup, the group descriptor
 206          * backups, the inode bitmap, the block bitmap, and the inode
 207          * table.
 208          */
 209         overhead = (int) (2 + fs->inode_blocks_per_group);
 210
 211         if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
 212                 overhead += 1 + fs->desc_blocks +
 213                         fs->super->s_reserved_gdt_blocks;
 214
 215         /*
 216          * See if the last group is big enough to support the
 217          * necessary data structures.  If not, we need to get rid of
 218          * it.
 219          */
 220         rem = (fs->super->s_blocks_count - fs->super->s_first_data_block) %
 221                 fs->super->s_blocks_per_group;
 222         if ((fs->group_desc_count == 1) && rem && (rem < overhead))
 223                 return EXT2_ET_TOOSMALL;
 224         if (rem && (rem < overhead+50)) {
 225                 fs->super->s_blocks_count -= rem;
 226                 goto retry;
 227         }
 228         /*
 229          * Adjust the number of inodes
 230          */
 231         new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
 232         if (new_inodes > ~0U) {
 233                 fprintf(stderr, _("inodes (%llu) must be less than %u"),
 234                                    new_inodes, ~0U);
 235                 return EXT2_ET_TOO_MANY_INODES;
 236         }
 237         fs->super->s_inodes_count = fs->super->s_inodes_per_group *
 238                 fs->group_desc_count;
 239
 240         /*
 241          * Adjust the number of free blocks
 242          */
 243         blk = old_fs->super->s_blocks_count;
 244         if (blk > fs->super->s_blocks_count)
 245                 fs->super->s_free_blocks_count -=
 246                         (blk - fs->super->s_blocks_count);
 247         else
 248                 fs->super->s_free_blocks_count +=
 249                         (fs->super->s_blocks_count - blk);
 250
 251         /*
 252          * Adjust the number of reserved blocks
 253          */
 254         blk = (__u64)old_fs->super->s_r_blocks_count * 100 /
 255                 old_fs->super->s_blocks_count;
 256         fs->super->s_r_blocks_count = e2p_percent(blk,
 257                                                   fs->super->s_blocks_count);
 258
 259         /*
 260          * Adjust the bitmaps for size
 261          */
 262         retval = ext2fs_resize_inode_bitmap(fs->super->s_inodes_count,
 263                                             fs->super->s_inodes_count,
 264                                             fs->inode_map);
 265         if (retval) goto errout;
 266
 267         real_end = ((EXT2_BLOCKS_PER_GROUP(fs->super)
 268                      * fs->group_desc_count)) - 1 +
 269                              fs->super->s_first_data_block;
 270         retval = ext2fs_resize_block_bitmap(fs->super->s_blocks_count-1,
 271                                             real_end, fs->block_map);
 272
 273         if (retval) goto errout;
 274
 275         /*
 276          * Reallocate the group descriptors as necessary.
 277          */
 278         if (old_fs->desc_blocks != fs->desc_blocks) {
 279                 retval = ext2fs_resize_mem(old_fs->desc_blocks *
 280                                            fs->blocksize,
 281                                            fs->desc_blocks * fs->blocksize,
 282                                            &fs->group_desc);
 283                 if (retval)
 284                         goto errout;
 285                 if (fs->desc_blocks > old_fs->desc_blocks)
 286                         memset((char *) fs->group_desc +
 287                                (old_fs->desc_blocks * fs->blocksize), 0,
 288                                (fs->desc_blocks - old_fs->desc_blocks) *
 289                                fs->blocksize);
 290         }
 291
 292         /*
 293          * If the resize_inode feature is set, and we are changing the
 294          * number of descriptor blocks, then adjust
 295          * s_reserved_gdt_blocks if possible to avoid needing to move
 296          * the inode table either now or in the future.
 297          */
 298         if ((fs->super->s_feature_compat &
 299              EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
 300             (old_fs->desc_blocks != fs->desc_blocks)) {
 301                 int new;
 302
 303                 new = ((int) fs->super->s_reserved_gdt_blocks) +
 304                         (old_fs->desc_blocks - fs->desc_blocks);
 305                 if (new < 0)
 306                         new = 0;
 307                 if (new > (int) fs->blocksize/4)
 308                         new = fs->blocksize/4;
 309                 fs->super->s_reserved_gdt_blocks = new;
 310                 if (new == 0)
 311                         fs->super->s_feature_compat &=
 312                                 ~EXT2_FEATURE_COMPAT_RESIZE_INODE;
 313         }
 314
 315         /*
 316          * If we are shrinking the number block groups, we're done and
 317          * can exit now.
 318          */
 319         if (old_fs->group_desc_count > fs->group_desc_count) {
 320                 retval = 0;
 321                 goto errout;
 322         }
 323
 324         /*
 325          * Fix the count of the last (old) block group
 326          */
 327         old_numblocks = (old_fs->super->s_blocks_count -
 328                          old_fs->super->s_first_data_block) %
 329                                  old_fs->super->s_blocks_per_group;
 330         if (!old_numblocks)
 331                 old_numblocks = old_fs->super->s_blocks_per_group;
 332         if (old_fs->group_desc_count == fs->group_desc_count) {
 333                 numblocks = (fs->super->s_blocks_count -
 334                              fs->super->s_first_data_block) %
 335                         fs->super->s_blocks_per_group;
 336                 if (!numblocks)
 337                         numblocks = fs->super->s_blocks_per_group;
 338         } else
 339                 numblocks = fs->super->s_blocks_per_group;
 340         i = old_fs->group_desc_count - 1;
 341         fs->group_desc[i].bg_free_blocks_count += (numblocks-old_numblocks);
 342
 343         /*
 344          * If the number of block groups is staying the same, we're
 345          * done and can exit now.  (If the number block groups is
 346          * shrinking, we had exited earlier.)
 347          */
 348         if (old_fs->group_desc_count >= fs->group_desc_count) {
 349                 retval = 0;
 350                 goto errout;
 351         }
 352
 353         /*
 354          * Initialize the new block group descriptors
 355          */
 356         group_block = fs->super->s_first_data_block +
 357                 old_fs->group_desc_count * fs->super->s_blocks_per_group;
 358
 359         adj = old_fs->group_desc_count;
 360         max_group = fs->group_desc_count - adj;
 361         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 362                 old_desc_blocks = fs->super->s_first_meta_bg;
 363         else
 364                 old_desc_blocks = fs->desc_blocks +
 365                         fs->super->s_reserved_gdt_blocks;
 366         for (i = old_fs->group_desc_count;
 367              i < fs->group_desc_count; i++) {
 368                 memset(&fs->group_desc[i], 0,
 369                        sizeof(struct ext2_group_desc));
 370                 adjblocks = 0;
 371
 372                 if (i == fs->group_desc_count-1) {
 373                         numblocks = (fs->super->s_blocks_count -
 374                                      fs->super->s_first_data_block) %
 375                                              fs->super->s_blocks_per_group;
 376                         if (!numblocks)
 377                                 numblocks = fs->super->s_blocks_per_group;
 378                 } else
 379                         numblocks = fs->super->s_blocks_per_group;
 380
 381                 has_super = ext2fs_bg_has_super(fs, i);
 382                 if (has_super) {
 383                         ext2fs_mark_block_bitmap(fs->block_map, group_block);
 384                         adjblocks++;
 385                 }
 386                 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
 387                 meta_bg = i / meta_bg_size;
 388                 if (!(fs->super->s_feature_incompat &
 389                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 390                     (meta_bg < fs->super->s_first_meta_bg)) {
 391                         if (has_super) {
 392                                 for (j=0; j < old_desc_blocks; j++)
 393                                         ext2fs_mark_block_bitmap(fs->block_map,
 394                                                          group_block + 1 + j);
 395                                 adjblocks += old_desc_blocks;
 396                         }
 397                 } else {
 398                         if (has_super)
 399                                 has_super = 1;
 400                         if (((i % meta_bg_size) == 0) ||
 401                             ((i % meta_bg_size) == 1) ||
 402                             ((i % meta_bg_size) == (meta_bg_size-1)))
 403                                 ext2fs_mark_block_bitmap(fs->block_map,
 404                                                  group_block + has_super);
 405                 }
 406
 407                 adjblocks += 2 + fs->inode_blocks_per_group;
 408
 409                 numblocks -= adjblocks;
 410                 fs->super->s_free_blocks_count -= adjblocks;
 411                 fs->super->s_free_inodes_count +=
 412                         fs->super->s_inodes_per_group;
 413                 fs->group_desc[i].bg_free_blocks_count = numblocks;
 414                 fs->group_desc[i].bg_free_inodes_count =
 415                         fs->super->s_inodes_per_group;
 416                 fs->group_desc[i].bg_used_dirs_count = 0;
 417
 418                 retval = ext2fs_allocate_group_table(fs, i, 0);
 419                 if (retval) goto errout;
 420
 421                 group_block += fs->super->s_blocks_per_group;
 422         }
 423         retval = 0;
 424
 425 errout:
 426         return (retval);
 427 }
 428
 429 /*
 430  * This routine adjusts the superblock and other data structures, both
 431  * in disk as well as in memory...
 432  */
 433 static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size)
 434 {
 435         ext2_filsys fs;
 436         int             adj = 0;
 437         errcode_t       retval;
 438         blk_t           group_block;
 439         unsigned long   i;
 440         unsigned long   max_group;
 441
 442         fs = rfs->new_fs;
 443         ext2fs_mark_super_dirty(fs);
 444         ext2fs_mark_bb_dirty(fs);
 445         ext2fs_mark_ib_dirty(fs);
 446
 447         retval = adjust_fs_info(fs, rfs->old_fs, new_size);
 448         if (retval)
 449                 goto errout;
 450
 451         /*
 452          * Check to make sure there are enough inodes
 453          */
 454         if ((rfs->old_fs->super->s_inodes_count -
 455              rfs->old_fs->super->s_free_inodes_count) >
 456             rfs->new_fs->super->s_inodes_count) {
 457                 retval = ENOSPC;
 458                 goto errout;
 459         }
 460
 461         /*
 462          * If we are shrinking the number block groups, we're done and
 463          * can exit now.
 464          */
 465         if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
 466                 retval = 0;
 467                 goto errout;
 468         }
 469
 470         /*
 471          * If the number of block groups is staying the same, we're
 472          * done and can exit now.  (If the number block groups is
 473          * shrinking, we had exited earlier.)
 474          */
 475         if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
 476                 retval = 0;
 477                 goto errout;
 478         }
 479
 480         /*
 481          * Initialize the new block group descriptors
 482          */
 483         retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
 484                                 &rfs->itable_buf);
 485         if (retval)
 486                 goto errout;
 487
 488         memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
 489         group_block = fs->super->s_first_data_block +
 490                 rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
 491
 492         adj = rfs->old_fs->group_desc_count;
 493         max_group = fs->group_desc_count - adj;
 494         if (rfs->progress) {
 495                 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 496                                        0, max_group);
 497                 if (retval)
 498                         goto errout;
 499         }
 500         for (i = rfs->old_fs->group_desc_count;
 501              i < fs->group_desc_count; i++) {
 502                 /*
 503                  * Write out the new inode table
 504                  */
 505                 retval = io_channel_write_blk(fs->io,
 506                                               fs->group_desc[i].bg_inode_table,
 507                                               fs->inode_blocks_per_group,
 508                                               rfs->itable_buf);
 509                 if (retval) goto errout;
 510
 511                 io_channel_flush(fs->io);
 512                 if (rfs->progress) {
 513                         retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 514                                                i - adj + 1, max_group);
 515                         if (retval)
 516                                 goto errout;
 517                 }
 518                 group_block += fs->super->s_blocks_per_group;
 519         }
 520         io_channel_flush(fs->io);
 521         retval = 0;
 522
 523 errout:
 524         return retval;
 525 }
 526
 527 /* --------------------------------------------------------------------
 528  *
 529  * Resize processing, phase 2.
 530  *
 531  * In this phase we adjust determine which blocks need to be moved, in
 532  * blocks_to_move().  We then copy the blocks to their ultimate new
 533  * destinations using block_mover().  Since we are copying blocks to
 534  * their new locations, again during this pass we can abort without
 535  * any problems.
 536  * --------------------------------------------------------------------
 537  */
 538
 539 /*
 540  * This helper function creates a block bitmap with all of the
 541  * filesystem meta-data blocks.
 542  */
 543 static errcode_t mark_table_blocks(ext2_filsys fs,
 544                                    ext2fs_block_bitmap bmap)
 545 {
 546         blk_t                   b;
 547         unsigned int            j;
 548         dgrp_t                  i;
 549         unsigned long           meta_bg_size;
 550         unsigned int            old_desc_blocks;
 551
 552         meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
 553         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 554                 old_desc_blocks = fs->super->s_first_meta_bg;
 555         else
 556                 old_desc_blocks = fs->desc_blocks +
 557                         fs->super->s_reserved_gdt_blocks;
 558         for (i = 0; i < fs->group_desc_count; i++) {
 559                 ext2fs_reserve_super_and_bgd(fs, i, bmap);
 560
 561                 /*
 562                  * Mark the blocks used for the inode table
 563                  */
 564                 for (j = 0, b = fs->group_desc[i].bg_inode_table;
 565                      j < (unsigned int) fs->inode_blocks_per_group;
 566                      j++, b++)
 567                         ext2fs_mark_block_bitmap(bmap, b);
 568
 569                 /*
 570                  * Mark block used for the block bitmap
 571                  */
 572                 ext2fs_mark_block_bitmap(bmap,
 573                                          fs->group_desc[i].bg_block_bitmap);
 574
 575                 /*
 576                  * Mark block used for the inode bitmap
 577                  */
 578                 ext2fs_mark_block_bitmap(bmap,
 579                                          fs->group_desc[i].bg_inode_bitmap);
 580         }
 581         return 0;
 582 }
 583
 584 /*
 585  * This function checks to see if a particular block (either a
 586  * superblock or a block group descriptor) overlaps with an inode or
 587  * block bitmap block, or with the inode table.
 588  */
 589 static void mark_fs_metablock(ext2_resize_t rfs,
 590                               ext2fs_block_bitmap meta_bmap,
 591                               int group, blk_t blk)
 592 {
 593         ext2_filsys     fs = rfs->new_fs;
 594
 595         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 596         ext2fs_mark_block_bitmap(fs->block_map, blk);
 597
 598         /*
 599          * Check to see if we overlap with the inode or block bitmap,
 600          * or the inode tables.  If not, and the block is in use, then
 601          * mark it as a block to be moved.
 602          */
 603         if (IS_BLOCK_BM(fs, group, blk)) {
 604                 FS_BLOCK_BM(fs, group) = 0;
 605                 rfs->needed_blocks++;
 606         } else if (IS_INODE_BM(fs, group, blk)) {
 607                 FS_INODE_BM(fs, group) = 0;
 608                 rfs->needed_blocks++;
 609         } else if (IS_INODE_TB(fs, group, blk)) {
 610                 FS_INODE_TB(fs, group) = 0;
 611                 rfs->needed_blocks++;
 612         } else if (ext2fs_test_block_bitmap(rfs->old_fs->block_map, blk) &&
 613                    !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 614                 ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 615                 rfs->needed_blocks++;
 616         }
 617 }
 618
 619
 620 /*
 621  * This routine marks and unmarks reserved blocks in the new block
 622  * bitmap.  It also determines which blocks need to be moved and
 623  * places this information into the move_blocks bitmap.
 624  */
 625 static errcode_t blocks_to_move(ext2_resize_t rfs)
 626 {
 627         int             j, has_super;
 628         dgrp_t          i, max_groups;
 629         blk_t           blk, group_blk;
 630         unsigned long   old_blocks, new_blocks;
 631         unsigned int    meta_bg, meta_bg_size;
 632         errcode_t       retval;
 633         ext2_filsys     fs, old_fs;
 634         ext2fs_block_bitmap     meta_bmap;
 635
 636         fs = rfs->new_fs;
 637         old_fs = rfs->old_fs;
 638         if (old_fs->super->s_blocks_count > fs->super->s_blocks_count)
 639                 fs = rfs->old_fs;
 640
 641         retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
 642                                               &rfs->reserve_blocks);
 643         if (retval)
 644                 return retval;
 645
 646         retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
 647                                               &rfs->move_blocks);
 648         if (retval)
 649                 return retval;
 650
 651         retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
 652                                               &meta_bmap);
 653         if (retval)
 654                 return retval;
 655
 656         retval = mark_table_blocks(old_fs, meta_bmap);
 657         if (retval)
 658                 return retval;
 659
 660         fs = rfs->new_fs;
 661
 662         /*
 663          * If we're shrinking the filesystem, we need to move all of
 664          * the blocks that don't fit any more
 665          */
 666         for (blk = fs->super->s_blocks_count;
 667              blk < old_fs->super->s_blocks_count; blk++) {
 668                 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 669                     !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 670                         ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 671                         rfs->needed_blocks++;
 672                 }
 673                 ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 674         }
 675
 676         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
 677                 old_blocks = old_fs->super->s_first_meta_bg;
 678                 new_blocks = fs->super->s_first_meta_bg;
 679         } else {
 680                 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
 681                 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
 682         }
 683
 684         if (old_blocks == new_blocks) {
 685                 retval = 0;
 686                 goto errout;
 687         }
 688
 689         max_groups = fs->group_desc_count;
 690         if (max_groups > old_fs->group_desc_count)
 691                 max_groups = old_fs->group_desc_count;
 692         group_blk = old_fs->super->s_first_data_block;
 693         /*
 694          * If we're reducing the number of descriptor blocks, this
 695          * makes life easy.  :-)   We just have to mark some extra
 696          * blocks as free.
 697          */
 698         if (old_blocks > new_blocks) {
 699                 for (i = 0; i < max_groups; i++) {
 700                         if (!ext2fs_bg_has_super(fs, i)) {
 701                                 group_blk += fs->super->s_blocks_per_group;
 702                                 continue;
 703                         }
 704                         for (blk = group_blk+1+new_blocks;
 705                              blk < group_blk+1+old_blocks; blk++) {
 706                                 ext2fs_unmark_block_bitmap(fs->block_map,
 707                                                            blk);
 708                                 rfs->needed_blocks--;
 709                         }
 710                         group_blk += fs->super->s_blocks_per_group;
 711                 }
 712                 retval = 0;
 713                 goto errout;
 714         }
 715         /*
 716          * If we're increasing the number of descriptor blocks, life
 717          * gets interesting....
 718          */
 719         meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
 720         for (i = 0; i < max_groups; i++) {
 721                 has_super = ext2fs_bg_has_super(fs, i);
 722                 if (has_super)
 723                         mark_fs_metablock(rfs, meta_bmap, i, group_blk);
 724
 725                 meta_bg = i / meta_bg_size;
 726                 if (!(fs->super->s_feature_incompat &
 727                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 728                     (meta_bg < fs->super->s_first_meta_bg)) {
 729                         if (has_super) {
 730                                 for (blk = group_blk+1;
 731                                      blk < group_blk + 1 + new_blocks; blk++)
 732                                         mark_fs_metablock(rfs, meta_bmap,
 733                                                           i, blk);
 734                         }
 735                 } else {
 736                         if (has_super)
 737                                 has_super = 1;
 738                         if (((i % meta_bg_size) == 0) ||
 739                             ((i % meta_bg_size) == 1) ||
 740                             ((i % meta_bg_size) == (meta_bg_size-1)))
 741                                 mark_fs_metablock(rfs, meta_bmap, i,
 742                                                   group_blk + has_super);
 743                 }
 744
 745                 if (fs->group_desc[i].bg_inode_table &&
 746                     fs->group_desc[i].bg_inode_bitmap &&
 747                     fs->group_desc[i].bg_block_bitmap)
 748                         goto next_group;
 749
 750                 /*
 751                  * Reserve the existing meta blocks that we know
 752                  * aren't to be moved.
 753                  */
 754                 if (fs->group_desc[i].bg_block_bitmap)
 755                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 756                                  fs->group_desc[i].bg_block_bitmap);
 757                 if (fs->group_desc[i].bg_inode_bitmap)
 758                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 759                                  fs->group_desc[i].bg_inode_bitmap);
 760                 if (fs->group_desc[i].bg_inode_table)
 761                         for (blk = fs->group_desc[i].bg_inode_table, j=0;
 762                              j < fs->inode_blocks_per_group ; j++, blk++)
 763                                 ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 764                                                          blk);
 765
 766                 /*
 767                  * Allocate the missing data structures
 768                  */
 769                 retval = ext2fs_allocate_group_table(fs, i,
 770                                                      rfs->reserve_blocks);
 771                 if (retval)
 772                         goto errout;
 773
 774                 /*
 775                  * For those structures that have changed, we need to
 776                  * do bookkeepping.
 777                  */
 778                 if (FS_BLOCK_BM(old_fs, i) !=
 779                     (blk = FS_BLOCK_BM(fs, i))) {
 780                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 781                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 782                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 783                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 784                                                          blk);
 785                 }
 786                 if (FS_INODE_BM(old_fs, i) !=
 787                     (blk = FS_INODE_BM(fs, i))) {
 788                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 789                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 790                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 791                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 792                                                          blk);
 793                 }
 794
 795                 /*
 796                  * The inode table, if we need to relocate it, is
 797                  * handled specially.  We have to reserve the blocks
 798                  * for both the old and the new inode table, since we
 799                  * can't have the inode table be destroyed during the
 800                  * block relocation phase.
 801                  */
 802                 if (FS_INODE_TB(fs, i) == FS_INODE_TB(old_fs, i))
 803                         goto next_group; /* inode table not moved */
 804
 805                 rfs->needed_blocks += fs->inode_blocks_per_group;
 806
 807                 /*
 808                  * Mark the new inode table as in use in the new block
 809                  * allocation bitmap, and move any blocks that might
 810                  * be necessary.
 811                  */
 812                 for (blk = fs->group_desc[i].bg_inode_table, j=0;
 813                      j < fs->inode_blocks_per_group ; j++, blk++) {
 814                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 815                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 816                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 817                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 818                                                          blk);
 819                 }
 820
 821                 /*
 822                  * Make sure the old inode table is reserved in the
 823                  * block reservation bitmap.
 824                  */
 825                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
 826                      j < fs->inode_blocks_per_group ; j++, blk++)
 827                         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 828
 829         next_group:
 830                 group_blk += rfs->new_fs->super->s_blocks_per_group;
 831         }
 832         retval = 0;
 833
 834 errout:
 835         if (meta_bmap)
 836                 ext2fs_free_block_bitmap(meta_bmap);
 837
 838         return retval;
 839 }
 840
 841 /*
 842  * This helper function tries to allocate a new block.  We try to
 843  * avoid hitting the original group descriptor blocks at least at
 844  * first, since we want to make it possible to recover from a badly
 845  * aborted resize operation as much as possible.
 846  *
 847  * In the future, I may further modify this routine to balance out
 848  * where we get the new blocks across the various block groups.
 849  * Ideally we would allocate blocks that corresponded with the block
 850  * group of the containing inode, and keep contiguous blocks
 851  * together.  However, this very difficult to do efficiently, since we
 852  * don't have the necessary information up front.
 853  */
 854
 855 #define AVOID_OLD       1
 856 #define DESPERATION     2
 857
 858 static void init_block_alloc(ext2_resize_t rfs)
 859 {
 860         rfs->alloc_state = AVOID_OLD;
 861         rfs->new_blk = rfs->new_fs->super->s_first_data_block;
 862 #if 0
 863         /* HACK for testing */
 864         if (rfs->new_fs->super->s_blocks_count >
 865             rfs->old_fs->super->s_blocks_count)
 866                 rfs->new_blk = rfs->old_fs->super->s_blocks_count;
 867 #endif
 868 }
 869
 870 static blk_t get_new_block(ext2_resize_t rfs)
 871 {
 872         ext2_filsys     fs = rfs->new_fs;
 873
 874         while (1) {
 875                 if (rfs->new_blk >= fs->super->s_blocks_count) {
 876                         if (rfs->alloc_state == DESPERATION)
 877                                 return 0;
 878
 879 #ifdef RESIZE2FS_DEBUG
 880                         if (rfs->flags & RESIZE_DEBUG_BMOVE)
 881                                 printf("Going into desperation mode "
 882                                        "for block allocations\n");
 883 #endif
 884                         rfs->alloc_state = DESPERATION;
 885                         rfs->new_blk = fs->super->s_first_data_block;
 886                         continue;
 887                 }
 888                 if (ext2fs_test_block_bitmap(fs->block_map, rfs->new_blk) ||
 889                     ext2fs_test_block_bitmap(rfs->reserve_blocks,
 890                                              rfs->new_blk) ||
 891                     ((rfs->alloc_state == AVOID_OLD) &&
 892                      (rfs->new_blk < rfs->old_fs->super->s_blocks_count) &&
 893                      ext2fs_test_block_bitmap(rfs->old_fs->block_map,
 894                                               rfs->new_blk))) {
 895                         rfs->new_blk++;
 896                         continue;
 897                 }
 898                 return rfs->new_blk;
 899         }
 900 }
 901
 902 static errcode_t block_mover(ext2_resize_t rfs)
 903 {
 904         blk_t                   blk, old_blk, new_blk;
 905         ext2_filsys             fs = rfs->new_fs;
 906         ext2_filsys             old_fs = rfs->old_fs;
 907         errcode_t               retval;
 908         int                     size, c;
 909         int                     to_move, moved;
 910         ext2_badblocks_list     badblock_list = 0;
 911         int                     bb_modified = 0;
 912
 913         retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
 914         if (retval)
 915                 return retval;
 916
 917         new_blk = fs->super->s_first_data_block;
 918         if (!rfs->itable_buf) {
 919                 retval = ext2fs_get_array(fs->blocksize,
 920                                         fs->inode_blocks_per_group,
 921                                         &rfs->itable_buf);
 922                 if (retval)
 923                         return retval;
 924         }
 925         retval = ext2fs_create_extent_table(&rfs->bmap, 0);
 926         if (retval)
 927                 return retval;
 928
 929         /*
 930          * The first step is to figure out where all of the blocks
 931          * will go.
 932          */
 933         to_move = moved = 0;
 934         init_block_alloc(rfs);
 935         for (blk = old_fs->super->s_first_data_block;
 936              blk < old_fs->super->s_blocks_count; blk++) {
 937                 if (!ext2fs_test_block_bitmap(old_fs->block_map, blk))
 938                         continue;
 939                 if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk))
 940                         continue;
 941                 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
 942                         ext2fs_badblocks_list_del(badblock_list, blk);
 943                         bb_modified++;
 944                         continue;
 945                 }
 946
 947                 new_blk = get_new_block(rfs);
 948                 if (!new_blk) {
 949                         retval = ENOSPC;
 950                         goto errout;
 951                 }
 952                 ext2fs_mark_block_bitmap(fs->block_map, new_blk);
 953                 ext2fs_add_extent_entry(rfs->bmap, blk, new_blk);
 954                 to_move++;
 955         }
 956
 957         if (to_move == 0) {
 958                 if (rfs->bmap) {
 959                         ext2fs_free_extent_table(rfs->bmap);
 960                         rfs->bmap = 0;
 961                 }
 962                 retval = 0;
 963                 goto errout;
 964         }
 965
 966         /*
 967          * Step two is to actually move the blocks
 968          */
 969         retval =  ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
 970         if (retval) goto errout;
 971
 972         if (rfs->progress) {
 973                 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
 974                                          0, to_move);
 975                 if (retval)
 976                         goto errout;
 977         }
 978         while (1) {
 979                 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
 980                 if (retval) goto errout;
 981                 if (!size)
 982                         break;
 983 #ifdef RESIZE2FS_DEBUG
 984                 if (rfs->flags & RESIZE_DEBUG_BMOVE)
 985                         printf("Moving %d blocks %u->%u\n",
 986                                size, old_blk, new_blk);
 987 #endif
 988                 do {
 989                         c = size;
 990                         if (c > fs->inode_blocks_per_group)
 991                                 c = fs->inode_blocks_per_group;
 992                         retval = io_channel_read_blk(fs->io, old_blk, c,
 993                                                      rfs->itable_buf);
 994                         if (retval) goto errout;
 995                         retval = io_channel_write_blk(fs->io, new_blk, c,
 996                                                       rfs->itable_buf);
 997                         if (retval) goto errout;
 998                         size -= c;
 999                         new_blk += c;
1000                         old_blk += c;
1001                         moved += c;
1002                         if (rfs->progress) {
1003                                 io_channel_flush(fs->io);
1004                                 retval = (rfs->progress)(rfs,
1005                                                 E2_RSZ_BLOCK_RELOC_PASS,
1006                                                 moved, to_move);
1007                                 if (retval)
1008                                         goto errout;
1009                         }
1010                 } while (size > 0);
1011                 io_channel_flush(fs->io);
1012         }
1013
1014 errout:
1015         if (badblock_list) {
1016                 if (!retval && bb_modified)
1017                         retval = ext2fs_update_bb_inode(old_fs,
1018                                                         badblock_list);
1019                 ext2fs_badblocks_list_free(badblock_list);
1020         }
1021         return retval;
1022 }
1023
1024
1025 /* --------------------------------------------------------------------
1026  *
1027  * Resize processing, phase 3
1028  *
1029  * --------------------------------------------------------------------
1030  */
1031
1032
1033 struct process_block_struct {
1034         ext2_resize_t           rfs;
1035         ext2_ino_t              ino;
1036         struct ext2_inode *     inode;
1037         errcode_t               error;
1038         int                     is_dir;
1039         int                     changed;
1040 };
1041
1042 static int process_block(ext2_filsys fs, blk_t  *block_nr,
1043                          e2_blkcnt_t blockcnt,
1044                          blk_t ref_block EXT2FS_ATTR((unused)),
1045                          int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1046 {
1047         struct process_block_struct *pb;
1048         errcode_t       retval;
1049         blk_t           block, new_block;
1050         int             ret = 0;
1051
1052         pb = (struct process_block_struct *) priv_data;
1053         block = *block_nr;
1054         if (pb->rfs->bmap) {
1055                 new_block = ext2fs_extent_translate(pb->rfs->bmap, block);
1056                 if (new_block) {
1057                         *block_nr = new_block;
1058                         ret |= BLOCK_CHANGED;
1059                         pb->changed = 1;
1060 #ifdef RESIZE2FS_DEBUG
1061                         if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1062                                 printf("ino=%u, blockcnt=%lld, %u->%u\n",
1063                                        pb->ino, blockcnt, block, new_block);
1064 #endif
1065                         block = new_block;
1066                 }
1067         }
1068         if (pb->is_dir) {
1069                 retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
1070                                               block, (int) blockcnt);
1071                 if (retval) {
1072                         pb->error = retval;
1073                         ret |= BLOCK_ABORT;
1074                 }
1075         }
1076         return ret;
1077 }
1078
1079 /*
1080  * Progress callback
1081  */
1082 static errcode_t progress_callback(ext2_filsys fs,
1083                                    ext2_inode_scan scan EXT2FS_ATTR((unused)),
1084                                    dgrp_t group, void * priv_data)
1085 {
1086         ext2_resize_t rfs = (ext2_resize_t) priv_data;
1087         errcode_t               retval;
1088
1089         /*
1090          * This check is to protect against old ext2 libraries.  It
1091          * shouldn't be needed against new libraries.
1092          */
1093         if ((group+1) == 0)
1094                 return 0;
1095
1096         if (rfs->progress) {
1097                 io_channel_flush(fs->io);
1098                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1099                                          group+1, fs->group_desc_count);
1100                 if (retval)
1101                         return retval;
1102         }
1103
1104         return 0;
1105 }
1106
1107 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1108 {
1109         struct process_block_struct     pb;
1110         ext2_ino_t              ino, new_inode;
1111         struct ext2_inode       *inode = NULL;
1112         ext2_inode_scan         scan = NULL;
1113         errcode_t               retval;
1114         int                     group;
1115         char                    *block_buf = 0;
1116         ext2_ino_t              start_to_move;
1117         blk_t                   orig_size, new_block;
1118         int                     inode_size;
1119
1120         if ((rfs->old_fs->group_desc_count <=
1121              rfs->new_fs->group_desc_count) &&
1122             !rfs->bmap)
1123                 return 0;
1124
1125         /*
1126          * Save the original size of the old filesystem, and
1127          * temporarily set the size to be the new size if the new size
1128          * is larger.  We need to do this to avoid catching an error
1129          * by the block iterator routines
1130          */
1131         orig_size = rfs->old_fs->super->s_blocks_count;
1132         if (orig_size < rfs->new_fs->super->s_blocks_count)
1133                 rfs->old_fs->super->s_blocks_count =
1134                         rfs->new_fs->super->s_blocks_count;
1135
1136         retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1137         if (retval) goto errout;
1138
1139         retval = ext2fs_init_dblist(rfs->old_fs, 0);
1140         if (retval) goto errout;
1141         retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
1142         if (retval) goto errout;
1143
1144         start_to_move = (rfs->new_fs->group_desc_count *
1145                          rfs->new_fs->super->s_inodes_per_group);
1146
1147         if (rfs->progress) {
1148                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1149                                          0, rfs->old_fs->group_desc_count);
1150                 if (retval)
1151                         goto errout;
1152         }
1153         ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1154         pb.rfs = rfs;
1155         pb.inode = inode;
1156         pb.error = 0;
1157         new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1158         inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
1159         inode = malloc(inode_size);
1160         if (!inode) {
1161                 retval = ENOMEM;
1162                 goto errout;
1163         }
1164         /*
1165          * First, copy all of the inodes that need to be moved
1166          * elsewhere in the inode table
1167          */
1168         while (1) {
1169                 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
1170                 if (retval) goto errout;
1171                 if (!ino)
1172                         break;
1173
1174                 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
1175                         continue; /* inode not in use */
1176
1177                 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
1178                 pb.changed = 0;
1179
1180                 if (inode->i_file_acl && rfs->bmap) {
1181                         new_block = ext2fs_extent_translate(rfs->bmap,
1182                                                             inode->i_file_acl);
1183                         if (new_block) {
1184                                 inode->i_file_acl = new_block;
1185                                 retval = ext2fs_write_inode_full(rfs->old_fs,
1186                                                             ino, inode, inode_size);
1187                                 if (retval) goto errout;
1188                         }
1189                 }
1190
1191                 if (ext2fs_inode_has_valid_blocks(inode) &&
1192                     (rfs->bmap || pb.is_dir)) {
1193                         pb.ino = ino;
1194                         retval = ext2fs_block_iterate2(rfs->old_fs,
1195                                                        ino, 0, block_buf,
1196                                                        process_block, &pb);
1197                         if (retval)
1198                                 goto errout;
1199                         if (pb.error) {
1200                                 retval = pb.error;
1201                                 goto errout;
1202                         }
1203                 }
1204
1205                 if (ino <= start_to_move)
1206                         continue; /* Don't need to move it. */
1207
1208                 /*
1209                  * Find a new inode
1210                  */
1211                 while (1) {
1212                         if (!ext2fs_test_inode_bitmap(rfs->new_fs->inode_map,
1213                                                       new_inode))
1214                                 break;
1215                         new_inode++;
1216                         if (new_inode > rfs->new_fs->super->s_inodes_count) {
1217                                 retval = ENOSPC;
1218                                 goto errout;
1219                         }
1220                 }
1221                 ext2fs_mark_inode_bitmap(rfs->new_fs->inode_map, new_inode);
1222                 if (pb.changed) {
1223                         /* Get the new version of the inode */
1224                         retval = ext2fs_read_inode_full(rfs->old_fs, ino,
1225                                                 inode, inode_size);
1226                         if (retval) goto errout;
1227                 }
1228                 inode->i_ctime = time(0);
1229                 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
1230                                                 inode, inode_size);
1231                 if (retval) goto errout;
1232
1233                 group = (new_inode-1) / EXT2_INODES_PER_GROUP(rfs->new_fs->super);
1234                 if (LINUX_S_ISDIR(inode->i_mode))
1235                         rfs->new_fs->group_desc[group].bg_used_dirs_count++;
1236
1237 #ifdef RESIZE2FS_DEBUG
1238                 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1239                         printf("Inode moved %u->%u\n", ino, new_inode);
1240 #endif
1241                 if (!rfs->imap) {
1242                         retval = ext2fs_create_extent_table(&rfs->imap, 0);
1243                         if (retval)
1244                                 goto errout;
1245                 }
1246                 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1247         }
1248         io_channel_flush(rfs->old_fs->io);
1249
1250 errout:
1251         rfs->old_fs->super->s_blocks_count = orig_size;
1252         if (rfs->bmap) {
1253                 ext2fs_free_extent_table(rfs->bmap);
1254                 rfs->bmap = 0;
1255         }
1256         if (scan)
1257                 ext2fs_close_inode_scan(scan);
1258         if (block_buf)
1259                 ext2fs_free_mem(&block_buf);
1260         if (inode)
1261                 free(inode);
1262         return retval;
1263 }
1264
1265 /* --------------------------------------------------------------------
1266  *
1267  * Resize processing, phase 4.
1268  *
1269  * --------------------------------------------------------------------
1270  */
1271
1272 struct istruct {
1273         ext2_resize_t rfs;
1274         errcode_t       err;
1275         unsigned long   max_dirs;
1276         int             num;
1277 };
1278
1279 static int check_and_change_inodes(ext2_ino_t dir,
1280                                    int entry EXT2FS_ATTR((unused)),
1281                                    struct ext2_dir_entry *dirent, int offset,
1282                                    int  blocksize EXT2FS_ATTR((unused)),
1283                                    char *buf EXT2FS_ATTR((unused)),
1284                                    void *priv_data)
1285 {
1286         struct istruct *is = (struct istruct *) priv_data;
1287         struct ext2_inode       inode;
1288         ext2_ino_t              new_inode;
1289         errcode_t               retval;
1290
1291         if (is->rfs->progress && offset == 0) {
1292                 io_channel_flush(is->rfs->old_fs->io);
1293                 is->err = (is->rfs->progress)(is->rfs,
1294                                               E2_RSZ_INODE_REF_UPD_PASS,
1295                                               ++is->num, is->max_dirs);
1296                 if (is->err)
1297                         return DIRENT_ABORT;
1298         }
1299
1300         if (!dirent->inode)
1301                 return 0;
1302
1303         new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1304
1305         if (!new_inode)
1306                 return 0;
1307 #ifdef RESIZE2FS_DEBUG
1308         if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1309                 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1310                        dir, dirent->name_len&0xFF, dirent->name,
1311                        dirent->inode, new_inode);
1312 #endif
1313
1314         dirent->inode = new_inode;
1315
1316         /* Update the directory mtime and ctime */
1317         retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1318         if (retval == 0) {
1319                 inode.i_mtime = inode.i_ctime = time(0);
1320                 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1321                 if (is->err)
1322                         return DIRENT_ABORT;
1323         }
1324
1325         return DIRENT_CHANGED;
1326 }
1327
1328 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1329 {
1330         errcode_t               retval;
1331         struct istruct          is;
1332
1333         if (!rfs->imap)
1334                 return 0;
1335
1336         /*
1337          * Now, we iterate over all of the directories to update the
1338          * inode references
1339          */
1340         is.num = 0;
1341         is.max_dirs = ext2fs_dblist_count(rfs->old_fs->dblist);
1342         is.rfs = rfs;
1343         is.err = 0;
1344
1345         if (rfs->progress) {
1346                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1347                                          0, is.max_dirs);
1348                 if (retval)
1349                         goto errout;
1350         }
1351
1352         retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1353                                            DIRENT_FLAG_INCLUDE_EMPTY, 0,
1354                                            check_and_change_inodes, &is);
1355         if (retval)
1356                 goto errout;
1357         if (is.err) {
1358                 retval = is.err;
1359                 goto errout;
1360         }
1361
1362 errout:
1363         ext2fs_free_extent_table(rfs->imap);
1364         rfs->imap = 0;
1365         return retval;
1366 }
1367
1368
1369 /* --------------------------------------------------------------------
1370  *
1371  * Resize processing, phase 5.
1372  *
1373  * In this phase we actually move the inode table around, and then
1374  * update the summary statistics.  This is scary, since aborting here
1375  * will potentially scramble the filesystem.  (We are moving the
1376  * inode tables around in place, and so the potential for lost data,
1377  * or at the very least scrambling the mapping between filenames and
1378  * inode numbers is very high in case of a power failure here.)
1379  * --------------------------------------------------------------------
1380  */
1381
1382
1383 /*
1384  * A very scary routine --- this one moves the inode table around!!!
1385  *
1386  * After this you have to use the rfs->new_fs file handle to read and
1387  * write inodes.
1388  */
1389 static errcode_t move_itables(ext2_resize_t rfs)
1390 {
1391         int             n, num, size, diff;
1392         dgrp_t          i, max_groups;
1393         ext2_filsys     fs = rfs->new_fs;
1394         char            *cp;
1395         blk_t           old_blk, new_blk, blk;
1396         errcode_t       retval;
1397         int             j, to_move, moved;
1398
1399         max_groups = fs->group_desc_count;
1400         if (max_groups > rfs->old_fs->group_desc_count)
1401                 max_groups = rfs->old_fs->group_desc_count;
1402
1403         size = fs->blocksize * fs->inode_blocks_per_group;
1404         if (!rfs->itable_buf) {
1405                 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1406                 if (retval)
1407                         return retval;
1408         }
1409
1410         /*
1411          * Figure out how many inode tables we need to move
1412          */
1413         to_move = moved = 0;
1414         for (i=0; i < max_groups; i++)
1415                 if (rfs->old_fs->group_desc[i].bg_inode_table !=
1416                     fs->group_desc[i].bg_inode_table)
1417                         to_move++;
1418
1419         if (to_move == 0)
1420                 return 0;
1421
1422         if (rfs->progress) {
1423                 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1424                                        0, to_move);
1425                 if (retval)
1426                         goto errout;
1427         }
1428
1429         rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1430
1431         for (i=0; i < max_groups; i++) {
1432                 old_blk = rfs->old_fs->group_desc[i].bg_inode_table;
1433                 new_blk = fs->group_desc[i].bg_inode_table;
1434                 diff = new_blk - old_blk;
1435
1436 #ifdef RESIZE2FS_DEBUG
1437                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1438                         printf("Itable move group %d block %u->%u (diff %d)\n",
1439                                i, old_blk, new_blk, diff);
1440 #endif
1441
1442                 if (!diff)
1443                         continue;
1444
1445                 retval = io_channel_read_blk(fs->io, old_blk,
1446                                              fs->inode_blocks_per_group,
1447                                              rfs->itable_buf);
1448                 if (retval)
1449                         goto errout;
1450                 /*
1451                  * The end of the inode table segment often contains
1452                  * all zeros, and we're often only moving the inode
1453                  * table down a block or two.  If so, we can optimize
1454                  * things by not rewriting blocks that we know to be zero
1455                  * already.
1456                  */
1457                 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
1458                         if (*cp)
1459                                 break;
1460                 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1461 #ifdef RESIZE2FS_DEBUG
1462                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1463                         printf("%d blocks of zeros...\n", n);
1464 #endif
1465                 num = fs->inode_blocks_per_group;
1466                 if (n > diff)
1467                         num -= n;
1468
1469                 retval = io_channel_write_blk(fs->io, new_blk,
1470                                               num, rfs->itable_buf);
1471                 if (retval) {
1472                         io_channel_write_blk(fs->io, old_blk,
1473                                              num, rfs->itable_buf);
1474                         goto errout;
1475                 }
1476                 if (n > diff) {
1477                         retval = io_channel_write_blk(fs->io,
1478                               old_blk + fs->inode_blocks_per_group,
1479                               diff, (rfs->itable_buf +
1480                                      (fs->inode_blocks_per_group - diff) *
1481                                      fs->blocksize));
1482                         if (retval)
1483                                 goto errout;
1484                 }
1485
1486                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
1487                      j < fs->inode_blocks_per_group ; j++, blk++)
1488                         ext2fs_unmark_block_bitmap(fs->block_map, blk);
1489
1490                 rfs->old_fs->group_desc[i].bg_inode_table = new_blk;
1491                 ext2fs_mark_super_dirty(rfs->old_fs);
1492                 ext2fs_flush(rfs->old_fs);
1493
1494                 if (rfs->progress) {
1495                         retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1496                                                ++moved, to_move);
1497                         if (retval)
1498                                 goto errout;
1499                 }
1500         }
1501         mark_table_blocks(fs, fs->block_map);
1502         ext2fs_flush(fs);
1503 #ifdef RESIZE2FS_DEBUG
1504         if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1505                 printf("Inode table move finished.\n");
1506 #endif
1507         return 0;
1508
1509 errout:
1510         return retval;
1511 }
1512
1513 /*
1514  * Fix the resize inode
1515  */
1516 static errcode_t fix_resize_inode(ext2_filsys fs)
1517 {
1518         struct ext2_inode       inode;
1519         errcode_t               retval;
1520         char *                  block_buf;
1521
1522         if (!(fs->super->s_feature_compat &
1523               EXT2_FEATURE_COMPAT_RESIZE_INODE))
1524                 return 0;
1525
1526         retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1527         if (retval) goto errout;
1528
1529         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1530         if (retval) goto errout;
1531
1532         inode.i_blocks = fs->blocksize/512;
1533
1534         retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1535         if (retval) goto errout;
1536
1537         if (!inode.i_block[EXT2_DIND_BLOCK]) {
1538                 /*
1539                  * Avoid zeroing out block #0; that's rude.  This
1540                  * should never happen anyway since the filesystem
1541                  * should be fsck'ed and we assume it is consistent.
1542                  */
1543                 fprintf(stderr,
1544                         _("Should never happen: resize inode corrupt!\n"));
1545                 exit(1);
1546         }
1547
1548         memset(block_buf, 0, fs->blocksize);
1549
1550         retval = io_channel_write_blk(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1551                                       1, block_buf);
1552         if (retval) goto errout;
1553
1554         retval = ext2fs_create_resize_inode(fs);
1555         if (retval)
1556                 goto errout;
1557
1558 errout:
1559         if (block_buf)
1560                 ext2fs_free_mem(&block_buf);
1561         return retval;
1562 }
1563
1564 /*
1565  * Finally, recalculate the summary information
1566  */
1567 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1568 {
1569         blk_t           blk;
1570         ext2_ino_t      ino;
1571         unsigned int    group = 0;
1572         unsigned int    count = 0;
1573         int             total_free = 0;
1574         int             group_free = 0;
1575
1576         /*
1577          * First calculate the block statistics
1578          */
1579         for (blk = fs->super->s_first_data_block;
1580              blk < fs->super->s_blocks_count; blk++) {
1581                 if (!ext2fs_fast_test_block_bitmap(fs->block_map, blk)) {
1582                         group_free++;
1583                         total_free++;
1584                 }
1585                 count++;
1586                 if ((count == fs->super->s_blocks_per_group) ||
1587                     (blk == fs->super->s_blocks_count-1)) {
1588                         fs->group_desc[group++].bg_free_blocks_count =
1589                                 group_free;
1590                         count = 0;
1591                         group_free = 0;
1592                 }
1593         }
1594         fs->super->s_free_blocks_count = total_free;
1595
1596         /*
1597          * Next, calculate the inode statistics
1598          */
1599         group_free = 0;
1600         total_free = 0;
1601         count = 0;
1602         group = 0;
1603
1604         /* Protect loop from wrap-around if s_inodes_count maxed */
1605         for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
1606                 if (!ext2fs_fast_test_inode_bitmap(fs->inode_map, ino)) {
1607                         group_free++;
1608                         total_free++;
1609                 }
1610                 count++;
1611                 if ((count == fs->super->s_inodes_per_group) ||
1612                     (ino == fs->super->s_inodes_count)) {
1613                         fs->group_desc[group++].bg_free_inodes_count =
1614                                 group_free;
1615                         count = 0;
1616                         group_free = 0;
1617                 }
1618         }
1619         fs->super->s_free_inodes_count = total_free;
1620         ext2fs_mark_super_dirty(fs);
1621         return 0;
1622 }