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 = (fs->blocksize /
 387                                 sizeof (struct ext2_group_desc));
 388                 meta_bg = i / meta_bg_size;
 389                 if (!(fs->super->s_feature_incompat &
 390                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 391                     (meta_bg < fs->super->s_first_meta_bg)) {
 392                         if (has_super) {
 393                                 for (j=0; j < old_desc_blocks; j++)
 394                                         ext2fs_mark_block_bitmap(fs->block_map,
 395                                                          group_block + 1 + j);
 396                                 adjblocks += old_desc_blocks;
 397                         }
 398                 } else {
 399                         if (has_super)
 400                                 has_super = 1;
 401                         if (((i % meta_bg_size) == 0) ||
 402                             ((i % meta_bg_size) == 1) ||
 403                             ((i % meta_bg_size) == (meta_bg_size-1)))
 404                                 ext2fs_mark_block_bitmap(fs->block_map,
 405                                                  group_block + has_super);
 406                 }
 407
 408                 adjblocks += 2 + fs->inode_blocks_per_group;
 409
 410                 numblocks -= adjblocks;
 411                 fs->super->s_free_blocks_count -= adjblocks;
 412                 fs->super->s_free_inodes_count +=
 413                         fs->super->s_inodes_per_group;
 414                 fs->group_desc[i].bg_free_blocks_count = numblocks;
 415                 fs->group_desc[i].bg_free_inodes_count =
 416                         fs->super->s_inodes_per_group;
 417                 fs->group_desc[i].bg_used_dirs_count = 0;
 418
 419                 retval = ext2fs_allocate_group_table(fs, i, 0);
 420                 if (retval) goto errout;
 421
 422                 group_block += fs->super->s_blocks_per_group;
 423         }
 424         retval = 0;
 425
 426 errout:
 427         return (retval);
 428 }
 429
 430 /*
 431  * This routine adjusts the superblock and other data structures, both
 432  * in disk as well as in memory...
 433  */
 434 static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size)
 435 {
 436         ext2_filsys fs;
 437         int             adj = 0;
 438         errcode_t       retval;
 439         blk_t           group_block;
 440         unsigned long   i;
 441         unsigned long   max_group;
 442
 443         fs = rfs->new_fs;
 444         ext2fs_mark_super_dirty(fs);
 445         ext2fs_mark_bb_dirty(fs);
 446         ext2fs_mark_ib_dirty(fs);
 447
 448         retval = adjust_fs_info(fs, rfs->old_fs, new_size);
 449         if (retval)
 450                 goto errout;
 451
 452         /*
 453          * Check to make sure there are enough inodes
 454          */
 455         if ((rfs->old_fs->super->s_inodes_count -
 456              rfs->old_fs->super->s_free_inodes_count) >
 457             rfs->new_fs->super->s_inodes_count) {
 458                 retval = ENOSPC;
 459                 goto errout;
 460         }
 461
 462         /*
 463          * If we are shrinking the number block groups, we're done and
 464          * can exit now.
 465          */
 466         if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
 467                 retval = 0;
 468                 goto errout;
 469         }
 470
 471         /*
 472          * If the number of block groups is staying the same, we're
 473          * done and can exit now.  (If the number block groups is
 474          * shrinking, we had exited earlier.)
 475          */
 476         if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
 477                 retval = 0;
 478                 goto errout;
 479         }
 480
 481         /*
 482          * Initialize the new block group descriptors
 483          */
 484         retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
 485                                 &rfs->itable_buf);
 486         if (retval)
 487                 goto errout;
 488
 489         memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
 490         group_block = fs->super->s_first_data_block +
 491                 rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
 492
 493         adj = rfs->old_fs->group_desc_count;
 494         max_group = fs->group_desc_count - adj;
 495         if (rfs->progress) {
 496                 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 497                                        0, max_group);
 498                 if (retval)
 499                         goto errout;
 500         }
 501         for (i = rfs->old_fs->group_desc_count;
 502              i < fs->group_desc_count; i++) {
 503                 /*
 504                  * Write out the new inode table
 505                  */
 506                 retval = io_channel_write_blk(fs->io,
 507                                               fs->group_desc[i].bg_inode_table,
 508                                               fs->inode_blocks_per_group,
 509                                               rfs->itable_buf);
 510                 if (retval) goto errout;
 511
 512                 io_channel_flush(fs->io);
 513                 if (rfs->progress) {
 514                         retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 515                                                i - adj + 1, max_group);
 516                         if (retval)
 517                                 goto errout;
 518                 }
 519                 group_block += fs->super->s_blocks_per_group;
 520         }
 521         io_channel_flush(fs->io);
 522         retval = 0;
 523
 524 errout:
 525         return retval;
 526 }
 527
 528 /* --------------------------------------------------------------------
 529  *
 530  * Resize processing, phase 2.
 531  *
 532  * In this phase we adjust determine which blocks need to be moved, in
 533  * blocks_to_move().  We then copy the blocks to their ultimate new
 534  * destinations using block_mover().  Since we are copying blocks to
 535  * their new locations, again during this pass we can abort without
 536  * any problems.
 537  * --------------------------------------------------------------------
 538  */
 539
 540 /*
 541  * This helper function creates a block bitmap with all of the
 542  * filesystem meta-data blocks.
 543  */
 544 static errcode_t mark_table_blocks(ext2_filsys fs,
 545                                    ext2fs_block_bitmap bmap)
 546 {
 547         blk_t                   b;
 548         unsigned int            j;
 549         dgrp_t                  i;
 550         unsigned long           meta_bg_size;
 551         unsigned int            old_desc_blocks;
 552
 553         meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
 554         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 555                 old_desc_blocks = fs->super->s_first_meta_bg;
 556         else
 557                 old_desc_blocks = fs->desc_blocks +
 558                         fs->super->s_reserved_gdt_blocks;
 559         for (i = 0; i < fs->group_desc_count; i++) {
 560                 ext2fs_reserve_super_and_bgd(fs, i, bmap);
 561
 562                 /*
 563                  * Mark the blocks used for the inode table
 564                  */
 565                 for (j = 0, b = fs->group_desc[i].bg_inode_table;
 566                      j < (unsigned int) fs->inode_blocks_per_group;
 567                      j++, b++)
 568                         ext2fs_mark_block_bitmap(bmap, b);
 569
 570                 /*
 571                  * Mark block used for the block bitmap
 572                  */
 573                 ext2fs_mark_block_bitmap(bmap,
 574                                          fs->group_desc[i].bg_block_bitmap);
 575
 576                 /*
 577                  * Mark block used for the inode bitmap
 578                  */
 579                 ext2fs_mark_block_bitmap(bmap,
 580                                          fs->group_desc[i].bg_inode_bitmap);
 581         }
 582         return 0;
 583 }
 584
 585 /*
 586  * This function checks to see if a particular block (either a
 587  * superblock or a block group descriptor) overlaps with an inode or
 588  * block bitmap block, or with the inode table.
 589  */
 590 static void mark_fs_metablock(ext2_resize_t rfs,
 591                               ext2fs_block_bitmap meta_bmap,
 592                               int group, blk_t blk)
 593 {
 594         ext2_filsys     fs = rfs->new_fs;
 595
 596         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 597         ext2fs_mark_block_bitmap(fs->block_map, blk);
 598
 599         /*
 600          * Check to see if we overlap with the inode or block bitmap,
 601          * or the inode tables.  If not, and the block is in use, then
 602          * mark it as a block to be moved.
 603          */
 604         if (IS_BLOCK_BM(fs, group, blk)) {
 605                 FS_BLOCK_BM(fs, group) = 0;
 606                 rfs->needed_blocks++;
 607         } else if (IS_INODE_BM(fs, group, blk)) {
 608                 FS_INODE_BM(fs, group) = 0;
 609                 rfs->needed_blocks++;
 610         } else if (IS_INODE_TB(fs, group, blk)) {
 611                 FS_INODE_TB(fs, group) = 0;
 612                 rfs->needed_blocks++;
 613         } else if (ext2fs_test_block_bitmap(rfs->old_fs->block_map, blk) &&
 614                    !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 615                 ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 616                 rfs->needed_blocks++;
 617         }
 618 }
 619
 620
 621 /*
 622  * This routine marks and unmarks reserved blocks in the new block
 623  * bitmap.  It also determines which blocks need to be moved and
 624  * places this information into the move_blocks bitmap.
 625  */
 626 static errcode_t blocks_to_move(ext2_resize_t rfs)
 627 {
 628         int             j, has_super;
 629         dgrp_t          i, max_groups;
 630         blk_t           blk, group_blk;
 631         unsigned long   old_blocks, new_blocks;
 632         unsigned int    meta_bg, meta_bg_size;
 633         errcode_t       retval;
 634         ext2_filsys     fs, old_fs;
 635         ext2fs_block_bitmap     meta_bmap;
 636
 637         fs = rfs->new_fs;
 638         old_fs = rfs->old_fs;
 639         if (old_fs->super->s_blocks_count > fs->super->s_blocks_count)
 640                 fs = rfs->old_fs;
 641
 642         retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
 643                                               &rfs->reserve_blocks);
 644         if (retval)
 645                 return retval;
 646
 647         retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
 648                                               &rfs->move_blocks);
 649         if (retval)
 650                 return retval;
 651
 652         retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
 653                                               &meta_bmap);
 654         if (retval)
 655                 return retval;
 656
 657         retval = mark_table_blocks(old_fs, meta_bmap);
 658         if (retval)
 659                 return retval;
 660
 661         fs = rfs->new_fs;
 662
 663         /*
 664          * If we're shrinking the filesystem, we need to move all of
 665          * the blocks that don't fit any more
 666          */
 667         for (blk = fs->super->s_blocks_count;
 668              blk < old_fs->super->s_blocks_count; blk++) {
 669                 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 670                     !ext2fs_test_block_bitmap(meta_bmap, blk)) {
 671                         ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
 672                         rfs->needed_blocks++;
 673                 }
 674                 ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 675         }
 676
 677         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
 678                 old_blocks = old_fs->super->s_first_meta_bg;
 679                 new_blocks = fs->super->s_first_meta_bg;
 680         } else {
 681                 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
 682                 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
 683         }
 684
 685         if (old_blocks == new_blocks) {
 686                 retval = 0;
 687                 goto errout;
 688         }
 689
 690         max_groups = fs->group_desc_count;
 691         if (max_groups > old_fs->group_desc_count)
 692                 max_groups = old_fs->group_desc_count;
 693         group_blk = old_fs->super->s_first_data_block;
 694         /*
 695          * If we're reducing the number of descriptor blocks, this
 696          * makes life easy.  :-)   We just have to mark some extra
 697          * blocks as free.
 698          */
 699         if (old_blocks > new_blocks) {
 700                 for (i = 0; i < max_groups; i++) {
 701                         if (!ext2fs_bg_has_super(fs, i)) {
 702                                 group_blk += fs->super->s_blocks_per_group;
 703                                 continue;
 704                         }
 705                         for (blk = group_blk+1+new_blocks;
 706                              blk < group_blk+1+old_blocks; blk++) {
 707                                 ext2fs_unmark_block_bitmap(fs->block_map,
 708                                                            blk);
 709                                 rfs->needed_blocks--;
 710                         }
 711                         group_blk += fs->super->s_blocks_per_group;
 712                 }
 713                 retval = 0;
 714                 goto errout;
 715         }
 716         /*
 717          * If we're increasing the number of descriptor blocks, life
 718          * gets interesting....
 719          */
 720         meta_bg_size = (fs->blocksize / sizeof (struct ext2_group_desc));
 721         for (i = 0; i < max_groups; i++) {
 722                 has_super = ext2fs_bg_has_super(fs, i);
 723                 if (has_super)
 724                         mark_fs_metablock(rfs, meta_bmap, i, group_blk);
 725
 726                 meta_bg = i / meta_bg_size;
 727                 if (!(fs->super->s_feature_incompat &
 728                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 729                     (meta_bg < fs->super->s_first_meta_bg)) {
 730                         if (has_super) {
 731                                 for (blk = group_blk+1;
 732                                      blk < group_blk + 1 + new_blocks; blk++)
 733                                         mark_fs_metablock(rfs, meta_bmap,
 734                                                           i, blk);
 735                         }
 736                 } else {
 737                         if (has_super)
 738                                 has_super = 1;
 739                         if (((i % meta_bg_size) == 0) ||
 740                             ((i % meta_bg_size) == 1) ||
 741                             ((i % meta_bg_size) == (meta_bg_size-1)))
 742                                 mark_fs_metablock(rfs, meta_bmap, i,
 743                                                   group_blk + has_super);
 744                 }
 745
 746                 if (fs->group_desc[i].bg_inode_table &&
 747                     fs->group_desc[i].bg_inode_bitmap &&
 748                     fs->group_desc[i].bg_block_bitmap)
 749                         goto next_group;
 750
 751                 /*
 752                  * Reserve the existing meta blocks that we know
 753                  * aren't to be moved.
 754                  */
 755                 if (fs->group_desc[i].bg_block_bitmap)
 756                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 757                                  fs->group_desc[i].bg_block_bitmap);
 758                 if (fs->group_desc[i].bg_inode_bitmap)
 759                         ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 760                                  fs->group_desc[i].bg_inode_bitmap);
 761                 if (fs->group_desc[i].bg_inode_table)
 762                         for (blk = fs->group_desc[i].bg_inode_table, j=0;
 763                              j < fs->inode_blocks_per_group ; j++, blk++)
 764                                 ext2fs_mark_block_bitmap(rfs->reserve_blocks,
 765                                                          blk);
 766
 767                 /*
 768                  * Allocate the missing data structures
 769                  */
 770                 retval = ext2fs_allocate_group_table(fs, i,
 771                                                      rfs->reserve_blocks);
 772                 if (retval)
 773                         goto errout;
 774
 775                 /*
 776                  * For those structures that have changed, we need to
 777                  * do bookkeepping.
 778                  */
 779                 if (FS_BLOCK_BM(old_fs, i) !=
 780                     (blk = FS_BLOCK_BM(fs, i))) {
 781                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 782                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 783                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 784                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 785                                                          blk);
 786                 }
 787                 if (FS_INODE_BM(old_fs, i) !=
 788                     (blk = FS_INODE_BM(fs, i))) {
 789                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 790                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 791                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 792                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 793                                                          blk);
 794                 }
 795
 796                 /*
 797                  * The inode table, if we need to relocate it, is
 798                  * handled specially.  We have to reserve the blocks
 799                  * for both the old and the new inode table, since we
 800                  * can't have the inode table be destroyed during the
 801                  * block relocation phase.
 802                  */
 803                 if (FS_INODE_TB(fs, i) == FS_INODE_TB(old_fs, i))
 804                         goto next_group; /* inode table not moved */
 805
 806                 rfs->needed_blocks += fs->inode_blocks_per_group;
 807
 808                 /*
 809                  * Mark the new inode table as in use in the new block
 810                  * allocation bitmap, and move any blocks that might
 811                  * be necessary.
 812                  */
 813                 for (blk = fs->group_desc[i].bg_inode_table, j=0;
 814                      j < fs->inode_blocks_per_group ; j++, blk++) {
 815                         ext2fs_mark_block_bitmap(fs->block_map, blk);
 816                         if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
 817                             !ext2fs_test_block_bitmap(meta_bmap, blk))
 818                                 ext2fs_mark_block_bitmap(rfs->move_blocks,
 819                                                          blk);
 820                 }
 821
 822                 /*
 823                  * Make sure the old inode table is reserved in the
 824                  * block reservation bitmap.
 825                  */
 826                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
 827                      j < fs->inode_blocks_per_group ; j++, blk++)
 828                         ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
 829
 830         next_group:
 831                 group_blk += rfs->new_fs->super->s_blocks_per_group;
 832         }
 833         retval = 0;
 834
 835 errout:
 836         if (meta_bmap)
 837                 ext2fs_free_block_bitmap(meta_bmap);
 838
 839         return retval;
 840 }
 841
 842 /*
 843  * This helper function tries to allocate a new block.  We try to
 844  * avoid hitting the original group descriptor blocks at least at
 845  * first, since we want to make it possible to recover from a badly
 846  * aborted resize operation as much as possible.
 847  *
 848  * In the future, I may further modify this routine to balance out
 849  * where we get the new blocks across the various block groups.
 850  * Ideally we would allocate blocks that corresponded with the block
 851  * group of the containing inode, and keep contiguous blocks
 852  * together.  However, this very difficult to do efficiently, since we
 853  * don't have the necessary information up front.
 854  */
 855
 856 #define AVOID_OLD       1
 857 #define DESPERATION     2
 858
 859 static void init_block_alloc(ext2_resize_t rfs)
 860 {
 861         rfs->alloc_state = AVOID_OLD;
 862         rfs->new_blk = rfs->new_fs->super->s_first_data_block;
 863 #if 0
 864         /* HACK for testing */
 865         if (rfs->new_fs->super->s_blocks_count >
 866             rfs->old_fs->super->s_blocks_count)
 867                 rfs->new_blk = rfs->old_fs->super->s_blocks_count;
 868 #endif
 869 }
 870
 871 static blk_t get_new_block(ext2_resize_t rfs)
 872 {
 873         ext2_filsys     fs = rfs->new_fs;
 874
 875         while (1) {
 876                 if (rfs->new_blk >= fs->super->s_blocks_count) {
 877                         if (rfs->alloc_state == DESPERATION)
 878                                 return 0;
 879
 880 #ifdef RESIZE2FS_DEBUG
 881                         if (rfs->flags & RESIZE_DEBUG_BMOVE)
 882                                 printf("Going into desperation mode "
 883                                        "for block allocations\n");
 884 #endif
 885                         rfs->alloc_state = DESPERATION;
 886                         rfs->new_blk = fs->super->s_first_data_block;
 887                         continue;
 888                 }
 889                 if (ext2fs_test_block_bitmap(fs->block_map, rfs->new_blk) ||
 890                     ext2fs_test_block_bitmap(rfs->reserve_blocks,
 891                                              rfs->new_blk) ||
 892                     ((rfs->alloc_state == AVOID_OLD) &&
 893                      (rfs->new_blk < rfs->old_fs->super->s_blocks_count) &&
 894                      ext2fs_test_block_bitmap(rfs->old_fs->block_map,
 895                                               rfs->new_blk))) {
 896                         rfs->new_blk++;
 897                         continue;
 898                 }
 899                 return rfs->new_blk;
 900         }
 901 }
 902
 903 static errcode_t block_mover(ext2_resize_t rfs)
 904 {
 905         blk_t                   blk, old_blk, new_blk;
 906         ext2_filsys             fs = rfs->new_fs;
 907         ext2_filsys             old_fs = rfs->old_fs;
 908         errcode_t               retval;
 909         int                     size, c;
 910         int                     to_move, moved;
 911         ext2_badblocks_list     badblock_list = 0;
 912         int                     bb_modified = 0;
 913
 914         retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
 915         if (retval)
 916                 return retval;
 917
 918         new_blk = fs->super->s_first_data_block;
 919         if (!rfs->itable_buf) {
 920                 retval = ext2fs_get_array(fs->blocksize,
 921                                         fs->inode_blocks_per_group,
 922                                         &rfs->itable_buf);
 923                 if (retval)
 924                         return retval;
 925         }
 926         retval = ext2fs_create_extent_table(&rfs->bmap, 0);
 927         if (retval)
 928                 return retval;
 929
 930         /*
 931          * The first step is to figure out where all of the blocks
 932          * will go.
 933          */
 934         to_move = moved = 0;
 935         init_block_alloc(rfs);
 936         for (blk = old_fs->super->s_first_data_block;
 937              blk < old_fs->super->s_blocks_count; blk++) {
 938                 if (!ext2fs_test_block_bitmap(old_fs->block_map, blk))
 939                         continue;
 940                 if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk))
 941                         continue;
 942                 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
 943                         ext2fs_badblocks_list_del(badblock_list, blk);
 944                         bb_modified++;
 945                         continue;
 946                 }
 947
 948                 new_blk = get_new_block(rfs);
 949                 if (!new_blk) {
 950                         retval = ENOSPC;
 951                         goto errout;
 952                 }
 953                 ext2fs_mark_block_bitmap(fs->block_map, new_blk);
 954                 ext2fs_add_extent_entry(rfs->bmap, blk, new_blk);
 955                 to_move++;
 956         }
 957
 958         if (to_move == 0) {
 959                 if (rfs->bmap) {
 960                         ext2fs_free_extent_table(rfs->bmap);
 961                         rfs->bmap = 0;
 962                 }
 963                 retval = 0;
 964                 goto errout;
 965         }
 966
 967         /*
 968          * Step two is to actually move the blocks
 969          */
 970         retval =  ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
 971         if (retval) goto errout;
 972
 973         if (rfs->progress) {
 974                 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
 975                                          0, to_move);
 976                 if (retval)
 977                         goto errout;
 978         }
 979         while (1) {
 980                 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
 981                 if (retval) goto errout;
 982                 if (!size)
 983                         break;
 984 #ifdef RESIZE2FS_DEBUG
 985                 if (rfs->flags & RESIZE_DEBUG_BMOVE)
 986                         printf("Moving %d blocks %u->%u\n",
 987                                size, old_blk, new_blk);
 988 #endif
 989                 do {
 990                         c = size;
 991                         if (c > fs->inode_blocks_per_group)
 992                                 c = fs->inode_blocks_per_group;
 993                         retval = io_channel_read_blk(fs->io, old_blk, c,
 994                                                      rfs->itable_buf);
 995                         if (retval) goto errout;
 996                         retval = io_channel_write_blk(fs->io, new_blk, c,
 997                                                       rfs->itable_buf);
 998                         if (retval) goto errout;
 999                         size -= c;
1000                         new_blk += c;
1001                         old_blk += c;
1002                         moved += c;
1003                         if (rfs->progress) {
1004                                 io_channel_flush(fs->io);
1005                                 retval = (rfs->progress)(rfs,
1006                                                 E2_RSZ_BLOCK_RELOC_PASS,
1007                                                 moved, to_move);
1008                                 if (retval)
1009                                         goto errout;
1010                         }
1011                 } while (size > 0);
1012                 io_channel_flush(fs->io);
1013         }
1014
1015 errout:
1016         if (badblock_list) {
1017                 if (!retval && bb_modified)
1018                         retval = ext2fs_update_bb_inode(old_fs,
1019                                                         badblock_list);
1020                 ext2fs_badblocks_list_free(badblock_list);
1021         }
1022         return retval;
1023 }
1024
1025
1026 /* --------------------------------------------------------------------
1027  *
1028  * Resize processing, phase 3
1029  *
1030  * --------------------------------------------------------------------
1031  */
1032
1033
1034 struct process_block_struct {
1035         ext2_resize_t           rfs;
1036         ext2_ino_t              ino;
1037         struct ext2_inode *     inode;
1038         errcode_t               error;
1039         int                     is_dir;
1040         int                     changed;
1041 };
1042
1043 static int process_block(ext2_filsys fs, blk_t  *block_nr,
1044                          e2_blkcnt_t blockcnt,
1045                          blk_t ref_block EXT2FS_ATTR((unused)),
1046                          int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1047 {
1048         struct process_block_struct *pb;
1049         errcode_t       retval;
1050         blk_t           block, new_block;
1051         int             ret = 0;
1052
1053         pb = (struct process_block_struct *) priv_data;
1054         block = *block_nr;
1055         if (pb->rfs->bmap) {
1056                 new_block = ext2fs_extent_translate(pb->rfs->bmap, block);
1057                 if (new_block) {
1058                         *block_nr = new_block;
1059                         ret |= BLOCK_CHANGED;
1060                         pb->changed = 1;
1061 #ifdef RESIZE2FS_DEBUG
1062                         if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1063                                 printf("ino=%u, blockcnt=%lld, %u->%u\n",
1064                                        pb->ino, blockcnt, block, new_block);
1065 #endif
1066                         block = new_block;
1067                 }
1068         }
1069         if (pb->is_dir) {
1070                 retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
1071                                               block, (int) blockcnt);
1072                 if (retval) {
1073                         pb->error = retval;
1074                         ret |= BLOCK_ABORT;
1075                 }
1076         }
1077         return ret;
1078 }
1079
1080 /*
1081  * Progress callback
1082  */
1083 static errcode_t progress_callback(ext2_filsys fs,
1084                                    ext2_inode_scan scan EXT2FS_ATTR((unused)),
1085                                    dgrp_t group, void * priv_data)
1086 {
1087         ext2_resize_t rfs = (ext2_resize_t) priv_data;
1088         errcode_t               retval;
1089
1090         /*
1091          * This check is to protect against old ext2 libraries.  It
1092          * shouldn't be needed against new libraries.
1093          */
1094         if ((group+1) == 0)
1095                 return 0;
1096
1097         if (rfs->progress) {
1098                 io_channel_flush(fs->io);
1099                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1100                                          group+1, fs->group_desc_count);
1101                 if (retval)
1102                         return retval;
1103         }
1104
1105         return 0;
1106 }
1107
1108 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1109 {
1110         struct process_block_struct     pb;
1111         ext2_ino_t              ino, new_inode;
1112         struct ext2_inode       inode, *buf = NULL;
1113         struct ext2_inode_large *large_inode;
1114         ext2_inode_scan         scan = NULL;
1115         errcode_t               retval;
1116         int                     group;
1117         char                    *block_buf = 0;
1118         ext2_ino_t              start_to_move;
1119         blk_t                   orig_size, new_block;
1120         int                     inode_size;
1121
1122         if ((rfs->old_fs->group_desc_count <=
1123              rfs->new_fs->group_desc_count) &&
1124             !rfs->bmap)
1125                 return 0;
1126
1127         /*
1128          * Save the original size of the old filesystem, and
1129          * temporarily set the size to be the new size if the new size
1130          * is larger.  We need to do this to avoid catching an error
1131          * by the block iterator routines
1132          */
1133         orig_size = rfs->old_fs->super->s_blocks_count;
1134         if (orig_size < rfs->new_fs->super->s_blocks_count)
1135                 rfs->old_fs->super->s_blocks_count =
1136                         rfs->new_fs->super->s_blocks_count;
1137
1138         retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1139         if (retval) goto errout;
1140
1141         retval = ext2fs_init_dblist(rfs->old_fs, 0);
1142         if (retval) goto errout;
1143         retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
1144         if (retval) goto errout;
1145
1146         start_to_move = (rfs->new_fs->group_desc_count *
1147                          rfs->new_fs->super->s_inodes_per_group);
1148
1149         if (rfs->progress) {
1150                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1151                                          0, rfs->old_fs->group_desc_count);
1152                 if (retval)
1153                         goto errout;
1154         }
1155         ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1156         pb.rfs = rfs;
1157         pb.inode = &inode;
1158         pb.error = 0;
1159         new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1160         inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
1161         buf = malloc(inode_size);
1162         if (!buf) {
1163                 retval = ENOMEM;
1164                 goto errout;
1165         }
1166         /*
1167          * First, copy all of the inodes that need to be moved
1168          * elsewhere in the inode table
1169          */
1170         while (1) {
1171                 retval = ext2fs_get_next_inode(scan, &ino, &inode);
1172                 if (retval) goto errout;
1173                 if (!ino)
1174                         break;
1175
1176                 if (inode.i_links_count == 0 && ino != EXT2_RESIZE_INO)
1177                         continue; /* inode not in use */
1178
1179                 pb.is_dir = LINUX_S_ISDIR(inode.i_mode);
1180                 pb.changed = 0;
1181
1182                 if (inode.i_file_acl && rfs->bmap) {
1183                         new_block = ext2fs_extent_translate(rfs->bmap,
1184                                                             inode.i_file_acl);
1185                         if (new_block) {
1186                                 inode.i_file_acl = new_block;
1187                                 retval = ext2fs_write_inode(rfs->old_fs,
1188                                                             ino, &inode);
1189                                 if (retval) goto errout;
1190                         }
1191                 }
1192
1193                 if (ext2fs_inode_has_valid_blocks(&inode) &&
1194                     (rfs->bmap || pb.is_dir)) {
1195                         pb.ino = ino;
1196                         retval = ext2fs_block_iterate2(rfs->old_fs,
1197                                                        ino, 0, block_buf,
1198                                                        process_block, &pb);
1199                         if (retval)
1200                                 goto errout;
1201                         if (pb.error) {
1202                                 retval = pb.error;
1203                                 goto errout;
1204                         }
1205                 }
1206
1207                 if (ino <= start_to_move)
1208                         continue; /* Don't need to move it. */
1209
1210                 /*
1211                  * Find a new inode
1212                  */
1213                 while (1) {
1214                         if (!ext2fs_test_inode_bitmap(rfs->new_fs->inode_map,
1215                                                       new_inode))
1216                                 break;
1217                         new_inode++;
1218                         if (new_inode > rfs->new_fs->super->s_inodes_count) {
1219                                 retval = ENOSPC;
1220                                 goto errout;
1221                         }
1222                 }
1223                 ext2fs_mark_inode_bitmap(rfs->new_fs->inode_map, new_inode);
1224                 memcpy(buf, &inode, sizeof(struct ext2_inode));
1225                 large_inode = (struct ext2_inode_large *)buf;
1226                 large_inode->i_extra_isize = sizeof(struct ext2_inode_large) -
1227                         EXT2_GOOD_OLD_INODE_SIZE;
1228                 if (pb.changed) {
1229                         /* Get the new version of the inode */
1230                         retval = ext2fs_read_inode_full(rfs->old_fs, ino,
1231                                                 buf, inode_size);
1232                         if (retval) goto errout;
1233                 }
1234                 inode.i_ctime = time(0);
1235                 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
1236                                                 buf, inode_size);
1237                 if (retval) goto errout;
1238
1239                 group = (new_inode-1) / EXT2_INODES_PER_GROUP(rfs->new_fs->super);
1240                 if (LINUX_S_ISDIR(inode.i_mode))
1241                         rfs->new_fs->group_desc[group].bg_used_dirs_count++;
1242
1243 #ifdef RESIZE2FS_DEBUG
1244                 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1245                         printf("Inode moved %u->%u\n", ino, new_inode);
1246 #endif
1247                 if (!rfs->imap) {
1248                         retval = ext2fs_create_extent_table(&rfs->imap, 0);
1249                         if (retval)
1250                                 goto errout;
1251                 }
1252                 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1253         }
1254         io_channel_flush(rfs->old_fs->io);
1255
1256 errout:
1257         rfs->old_fs->super->s_blocks_count = orig_size;
1258         if (rfs->bmap) {
1259                 ext2fs_free_extent_table(rfs->bmap);
1260                 rfs->bmap = 0;
1261         }
1262         if (scan)
1263                 ext2fs_close_inode_scan(scan);
1264         if (block_buf)
1265                 ext2fs_free_mem(&block_buf);
1266         if (buf)
1267                 free(buf);
1268         return retval;
1269 }
1270
1271 /* --------------------------------------------------------------------
1272  *
1273  * Resize processing, phase 4.
1274  *
1275  * --------------------------------------------------------------------
1276  */
1277
1278 struct istruct {
1279         ext2_resize_t rfs;
1280         errcode_t       err;
1281         unsigned long   max_dirs;
1282         int             num;
1283 };
1284
1285 static int check_and_change_inodes(ext2_ino_t dir,
1286                                    int entry EXT2FS_ATTR((unused)),
1287                                    struct ext2_dir_entry *dirent, int offset,
1288                                    int  blocksize EXT2FS_ATTR((unused)),
1289                                    char *buf EXT2FS_ATTR((unused)),
1290                                    void *priv_data)
1291 {
1292         struct istruct *is = (struct istruct *) priv_data;
1293         struct ext2_inode       inode;
1294         ext2_ino_t              new_inode;
1295         errcode_t               retval;
1296
1297         if (is->rfs->progress && offset == 0) {
1298                 io_channel_flush(is->rfs->old_fs->io);
1299                 is->err = (is->rfs->progress)(is->rfs,
1300                                               E2_RSZ_INODE_REF_UPD_PASS,
1301                                               ++is->num, is->max_dirs);
1302                 if (is->err)
1303                         return DIRENT_ABORT;
1304         }
1305
1306         if (!dirent->inode)
1307                 return 0;
1308
1309         new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1310
1311         if (!new_inode)
1312                 return 0;
1313 #ifdef RESIZE2FS_DEBUG
1314         if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1315                 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1316                        dir, dirent->name_len&0xFF, dirent->name,
1317                        dirent->inode, new_inode);
1318 #endif
1319
1320         dirent->inode = new_inode;
1321
1322         /* Update the directory mtime and ctime */
1323         retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1324         if (retval == 0) {
1325                 inode.i_mtime = inode.i_ctime = time(0);
1326                 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1327                 if (is->err)
1328                         return DIRENT_ABORT;
1329         }
1330
1331         return DIRENT_CHANGED;
1332 }
1333
1334 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1335 {
1336         errcode_t               retval;
1337         struct istruct          is;
1338
1339         if (!rfs->imap)
1340                 return 0;
1341
1342         /*
1343          * Now, we iterate over all of the directories to update the
1344          * inode references
1345          */
1346         is.num = 0;
1347         is.max_dirs = ext2fs_dblist_count(rfs->old_fs->dblist);
1348         is.rfs = rfs;
1349         is.err = 0;
1350
1351         if (rfs->progress) {
1352                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1353                                          0, is.max_dirs);
1354                 if (retval)
1355                         goto errout;
1356         }
1357
1358         retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1359                                            DIRENT_FLAG_INCLUDE_EMPTY, 0,
1360                                            check_and_change_inodes, &is);
1361         if (retval)
1362                 goto errout;
1363         if (is.err) {
1364                 retval = is.err;
1365                 goto errout;
1366         }
1367
1368 errout:
1369         ext2fs_free_extent_table(rfs->imap);
1370         rfs->imap = 0;
1371         return retval;
1372 }
1373
1374
1375 /* --------------------------------------------------------------------
1376  *
1377  * Resize processing, phase 5.
1378  *
1379  * In this phase we actually move the inode table around, and then
1380  * update the summary statistics.  This is scary, since aborting here
1381  * will potentially scramble the filesystem.  (We are moving the
1382  * inode tables around in place, and so the potential for lost data,
1383  * or at the very least scrambling the mapping between filenames and
1384  * inode numbers is very high in case of a power failure here.)
1385  * --------------------------------------------------------------------
1386  */
1387
1388
1389 /*
1390  * A very scary routine --- this one moves the inode table around!!!
1391  *
1392  * After this you have to use the rfs->new_fs file handle to read and
1393  * write inodes.
1394  */
1395 static errcode_t move_itables(ext2_resize_t rfs)
1396 {
1397         int             n, num, size, diff;
1398         dgrp_t          i, max_groups;
1399         ext2_filsys     fs = rfs->new_fs;
1400         char            *cp;
1401         blk_t           old_blk, new_blk, blk;
1402         errcode_t       retval;
1403         int             j, to_move, moved;
1404
1405         max_groups = fs->group_desc_count;
1406         if (max_groups > rfs->old_fs->group_desc_count)
1407                 max_groups = rfs->old_fs->group_desc_count;
1408
1409         size = fs->blocksize * fs->inode_blocks_per_group;
1410         if (!rfs->itable_buf) {
1411                 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1412                 if (retval)
1413                         return retval;
1414         }
1415
1416         /*
1417          * Figure out how many inode tables we need to move
1418          */
1419         to_move = moved = 0;
1420         for (i=0; i < max_groups; i++)
1421                 if (rfs->old_fs->group_desc[i].bg_inode_table !=
1422                     fs->group_desc[i].bg_inode_table)
1423                         to_move++;
1424
1425         if (to_move == 0)
1426                 return 0;
1427
1428         if (rfs->progress) {
1429                 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1430                                        0, to_move);
1431                 if (retval)
1432                         goto errout;
1433         }
1434
1435         rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1436
1437         for (i=0; i < max_groups; i++) {
1438                 old_blk = rfs->old_fs->group_desc[i].bg_inode_table;
1439                 new_blk = fs->group_desc[i].bg_inode_table;
1440                 diff = new_blk - old_blk;
1441
1442 #ifdef RESIZE2FS_DEBUG
1443                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1444                         printf("Itable move group %d block %u->%u (diff %d)\n",
1445                                i, old_blk, new_blk, diff);
1446 #endif
1447
1448                 if (!diff)
1449                         continue;
1450
1451                 retval = io_channel_read_blk(fs->io, old_blk,
1452                                              fs->inode_blocks_per_group,
1453                                              rfs->itable_buf);
1454                 if (retval)
1455                         goto errout;
1456                 /*
1457                  * The end of the inode table segment often contains
1458                  * all zeros, and we're often only moving the inode
1459                  * table down a block or two.  If so, we can optimize
1460                  * things by not rewriting blocks that we know to be zero
1461                  * already.
1462                  */
1463                 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
1464                         if (*cp)
1465                                 break;
1466                 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1467 #ifdef RESIZE2FS_DEBUG
1468                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1469                         printf("%d blocks of zeros...\n", n);
1470 #endif
1471                 num = fs->inode_blocks_per_group;
1472                 if (n > diff)
1473                         num -= n;
1474
1475                 retval = io_channel_write_blk(fs->io, new_blk,
1476                                               num, rfs->itable_buf);
1477                 if (retval) {
1478                         io_channel_write_blk(fs->io, old_blk,
1479                                              num, rfs->itable_buf);
1480                         goto errout;
1481                 }
1482                 if (n > diff) {
1483                         retval = io_channel_write_blk(fs->io,
1484                               old_blk + fs->inode_blocks_per_group,
1485                               diff, (rfs->itable_buf +
1486                                      (fs->inode_blocks_per_group - diff) *
1487                                      fs->blocksize));
1488                         if (retval)
1489                                 goto errout;
1490                 }
1491
1492                 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
1493                      j < fs->inode_blocks_per_group ; j++, blk++)
1494                         ext2fs_unmark_block_bitmap(fs->block_map, blk);
1495
1496                 rfs->old_fs->group_desc[i].bg_inode_table = new_blk;
1497                 ext2fs_mark_super_dirty(rfs->old_fs);
1498                 ext2fs_flush(rfs->old_fs);
1499
1500                 if (rfs->progress) {
1501                         retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1502                                                ++moved, to_move);
1503                         if (retval)
1504                                 goto errout;
1505                 }
1506         }
1507         mark_table_blocks(fs, fs->block_map);
1508         ext2fs_flush(fs);
1509 #ifdef RESIZE2FS_DEBUG
1510         if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1511                 printf("Inode table move finished.\n");
1512 #endif
1513         return 0;
1514
1515 errout:
1516         return retval;
1517 }
1518
1519 /*
1520  * Fix the resize inode
1521  */
1522 static errcode_t fix_resize_inode(ext2_filsys fs)
1523 {
1524         struct ext2_inode       inode;
1525         errcode_t               retval;
1526         char *                  block_buf;
1527
1528         if (!(fs->super->s_feature_compat &
1529               EXT2_FEATURE_COMPAT_RESIZE_INODE))
1530                 return 0;
1531
1532         retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1533         if (retval) goto errout;
1534
1535         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1536         if (retval) goto errout;
1537
1538         inode.i_blocks = fs->blocksize/512;
1539
1540         retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1541         if (retval) goto errout;
1542
1543         if (!inode.i_block[EXT2_DIND_BLOCK]) {
1544                 /*
1545                  * Avoid zeroing out block #0; that's rude.  This
1546                  * should never happen anyway since the filesystem
1547                  * should be fsck'ed and we assume it is consistent.
1548                  */
1549                 fprintf(stderr,
1550                         _("Should never happen: resize inode corrupt!\n"));
1551                 exit(1);
1552         }
1553
1554         memset(block_buf, 0, fs->blocksize);
1555
1556         retval = io_channel_write_blk(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1557                                       1, block_buf);
1558         if (retval) goto errout;
1559
1560         retval = ext2fs_create_resize_inode(fs);
1561         if (retval)
1562                 goto errout;
1563
1564 errout:
1565         if (block_buf)
1566                 ext2fs_free_mem(&block_buf);
1567         return retval;
1568 }
1569
1570 /*
1571  * Finally, recalculate the summary information
1572  */
1573 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1574 {
1575         blk_t           blk;
1576         ext2_ino_t      ino;
1577         unsigned int    group = 0;
1578         unsigned int    count = 0;
1579         int             total_free = 0;
1580         int             group_free = 0;
1581
1582         /*
1583          * First calculate the block statistics
1584          */
1585         for (blk = fs->super->s_first_data_block;
1586              blk < fs->super->s_blocks_count; blk++) {
1587                 if (!ext2fs_fast_test_block_bitmap(fs->block_map, blk)) {
1588                         group_free++;
1589                         total_free++;
1590                 }
1591                 count++;
1592                 if ((count == fs->super->s_blocks_per_group) ||
1593                     (blk == fs->super->s_blocks_count-1)) {
1594                         fs->group_desc[group++].bg_free_blocks_count =
1595                                 group_free;
1596                         count = 0;
1597                         group_free = 0;
1598                 }
1599         }
1600         fs->super->s_free_blocks_count = total_free;
1601
1602         /*
1603          * Next, calculate the inode statistics
1604          */
1605         group_free = 0;
1606         total_free = 0;
1607         count = 0;
1608         group = 0;
1609
1610         /* Protect loop from wrap-around if s_inodes_count maxed */
1611         for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
1612                 if (!ext2fs_fast_test_inode_bitmap(fs->inode_map, ino)) {
1613                         group_free++;
1614                         total_free++;
1615                 }
1616                 count++;
1617                 if ((count == fs->super->s_inodes_per_group) ||
1618                     (ino == fs->super->s_inodes_count)) {
1619                         fs->group_desc[group++].bg_free_inodes_count =
1620                                 group_free;
1621                         count = 0;
1622                         group_free = 0;
1623                 }
1624         }
1625         fs->super->s_free_inodes_count = total_free;
1626         ext2fs_mark_super_dirty(fs);
1627         return 0;
1628 }