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 "config.h"
  37 #include "resize2fs.h"
  38 #include <time.h>
  39
  40 #ifdef __linux__                        /* Kludge for debugging */
  41 #define RESIZE2FS_DEBUG
  42 #endif
  43
  44 static void fix_uninit_block_bitmaps(ext2_filsys fs);
  45 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size);
  46 static errcode_t blocks_to_move(ext2_resize_t rfs);
  47 static errcode_t block_mover(ext2_resize_t rfs);
  48 static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
  49 static errcode_t inode_ref_fix(ext2_resize_t rfs);
  50 static errcode_t move_itables(ext2_resize_t rfs);
  51 static errcode_t fix_resize_inode(ext2_filsys fs);
  52 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
  53 static errcode_t fix_sb_journal_backup(ext2_filsys fs);
  54 static errcode_t mark_table_blocks(ext2_filsys fs,
  55                                    ext2fs_block_bitmap bmap);
  56
  57 /*
  58  * Some helper CPP macros
  59  */
  60 #define IS_BLOCK_BM(fs, i, blk) ((blk) == ext2fs_block_bitmap_loc((fs),(i)))
  61 #define IS_INODE_BM(fs, i, blk) ((blk) == ext2fs_inode_bitmap_loc((fs),(i)))
  62
  63 #define IS_INODE_TB(fs, i, blk) (((blk) >= ext2fs_inode_table_loc((fs), (i))) && \
  64                                  ((blk) < (ext2fs_inode_table_loc((fs), (i)) + \
  65                                            (fs)->inode_blocks_per_group)))
  66
  67 /* Some bigalloc helper macros which are more succint... */
  68 #define B2C(x)  EXT2FS_B2C(fs, (x))
  69 #define C2B(x)  EXT2FS_C2B(fs, (x))
  70 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
  71 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
  72 #define LT_CLSTR(x, y) (B2C(x) <  B2C(y))
  73 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
  74 #define GT_CLSTR(x, y) (B2C(x) >  B2C(y))
  75
  76 int lazy_itable_init;
  77
  78 /*
  79  * This is the top-level routine which does the dirty deed....
  80  */
  81 errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
  82             errcode_t (*progress)(ext2_resize_t rfs, int pass,
  83                                           unsigned long cur,
  84                                           unsigned long max_val))
  85 {
  86         ext2_resize_t   rfs;
  87         errcode_t       retval;
  88         struct resource_track   rtrack, overall_track;
  89
  90         /*
  91          * Create the data structure
  92          */
  93         retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
  94         if (retval)
  95                 return retval;
  96
  97         memset(rfs, 0, sizeof(struct ext2_resize_struct));
  98         fs->priv_data = rfs;
  99         rfs->old_fs = fs;
 100         rfs->flags = flags;
 101         rfs->itable_buf  = 0;
 102         rfs->progress = progress;
 103
 104         init_resource_track(&overall_track, "overall resize2fs", fs->io);
 105         init_resource_track(&rtrack, "read_bitmaps", fs->io);
 106         retval = ext2fs_read_bitmaps(fs);
 107         if (retval)
 108                 goto errout;
 109         print_resource_track(rfs, &rtrack, fs->io);
 110
 111         fs->super->s_state |= EXT2_ERROR_FS;
 112         ext2fs_mark_super_dirty(fs);
 113         ext2fs_flush(fs);
 114
 115         init_resource_track(&rtrack, "fix_uninit_block_bitmaps 1", fs->io);
 116         fix_uninit_block_bitmaps(fs);
 117         print_resource_track(rfs, &rtrack, fs->io);
 118         retval = ext2fs_dup_handle(fs, &rfs->new_fs);
 119         if (retval)
 120                 goto errout;
 121
 122         init_resource_track(&rtrack, "adjust_superblock", fs->io);
 123         retval = adjust_superblock(rfs, *new_size);
 124         if (retval)
 125                 goto errout;
 126         print_resource_track(rfs, &rtrack, fs->io);
 127
 128
 129         init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
 130         fix_uninit_block_bitmaps(rfs->new_fs);
 131         print_resource_track(rfs, &rtrack, fs->io);
 132         /* Clear the block bitmap uninit flag for the last block group */
 133         ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
 134                              EXT2_BG_BLOCK_UNINIT);
 135
 136         *new_size = ext2fs_blocks_count(rfs->new_fs->super);
 137
 138         init_resource_track(&rtrack, "blocks_to_move", fs->io);
 139         retval = blocks_to_move(rfs);
 140         if (retval)
 141                 goto errout;
 142         print_resource_track(rfs, &rtrack, fs->io);
 143
 144 #ifdef RESIZE2FS_DEBUG
 145         if (rfs->flags & RESIZE_DEBUG_BMOVE)
 146                 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
 147                        ext2fs_free_blocks_count(rfs->old_fs->super),
 148                        ext2fs_free_blocks_count(rfs->new_fs->super),
 149                        rfs->needed_blocks);
 150 #endif
 151
 152         init_resource_track(&rtrack, "block_mover", fs->io);
 153         retval = block_mover(rfs);
 154         if (retval)
 155                 goto errout;
 156         print_resource_track(rfs, &rtrack, fs->io);
 157
 158         init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
 159         retval = inode_scan_and_fix(rfs);
 160         if (retval)
 161                 goto errout;
 162         print_resource_track(rfs, &rtrack, fs->io);
 163
 164         init_resource_track(&rtrack, "inode_ref_fix", fs->io);
 165         retval = inode_ref_fix(rfs);
 166         if (retval)
 167                 goto errout;
 168         print_resource_track(rfs, &rtrack, fs->io);
 169
 170         init_resource_track(&rtrack, "move_itables", fs->io);
 171         retval = move_itables(rfs);
 172         if (retval)
 173                 goto errout;
 174         print_resource_track(rfs, &rtrack, fs->io);
 175
 176         init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
 177         retval = ext2fs_calculate_summary_stats(rfs->new_fs);
 178         if (retval)
 179                 goto errout;
 180         print_resource_track(rfs, &rtrack, fs->io);
 181
 182         init_resource_track(&rtrack, "fix_resize_inode", fs->io);
 183         retval = fix_resize_inode(rfs->new_fs);
 184         if (retval)
 185                 goto errout;
 186         print_resource_track(rfs, &rtrack, fs->io);
 187
 188         init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
 189         retval = fix_sb_journal_backup(rfs->new_fs);
 190         if (retval)
 191                 goto errout;
 192         print_resource_track(rfs, &rtrack, fs->io);
 193
 194         rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
 195         rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 196
 197         print_resource_track(rfs, &overall_track, fs->io);
 198         retval = ext2fs_close(rfs->new_fs);
 199         if (retval)
 200                 goto errout;
 201
 202         rfs->flags = flags;
 203
 204         ext2fs_free(rfs->old_fs);
 205         if (rfs->itable_buf)
 206                 ext2fs_free_mem(&rfs->itable_buf);
 207         if (rfs->reserve_blocks)
 208                 ext2fs_free_block_bitmap(rfs->reserve_blocks);
 209         if (rfs->move_blocks)
 210                 ext2fs_free_block_bitmap(rfs->move_blocks);
 211         ext2fs_free_mem(&rfs);
 212
 213         return 0;
 214
 215 errout:
 216         if (rfs->new_fs)
 217                 ext2fs_free(rfs->new_fs);
 218         if (rfs->itable_buf)
 219                 ext2fs_free_mem(&rfs->itable_buf);
 220         ext2fs_free_mem(&rfs);
 221         return retval;
 222 }
 223
 224 /*
 225  * Clean up the bitmaps for unitialized bitmaps
 226  */
 227 static void fix_uninit_block_bitmaps(ext2_filsys fs)
 228 {
 229         blk64_t         blk, lblk;
 230         dgrp_t          g;
 231         int             i;
 232
 233         if (!(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 234                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
 235                 return;
 236
 237         for (g=0; g < fs->group_desc_count; g++) {
 238                 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
 239                         continue;
 240
 241                 blk = ext2fs_group_first_block2(fs, g);
 242                 lblk = ext2fs_group_last_block2(fs, g);
 243                 ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
 244                                                   lblk - blk + 1);
 245
 246                 ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
 247                 ext2fs_mark_block_bitmap2(fs->block_map,
 248                                           ext2fs_block_bitmap_loc(fs, g));
 249                 ext2fs_mark_block_bitmap2(fs->block_map,
 250                                           ext2fs_inode_bitmap_loc(fs, g));
 251                 for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
 252                      i < (unsigned int) fs->inode_blocks_per_group;
 253                      i++, blk++)
 254                         ext2fs_mark_block_bitmap2(fs->block_map, blk);
 255         }
 256 }
 257
 258 /* --------------------------------------------------------------------
 259  *
 260  * Resize processing, phase 1.
 261  *
 262  * In this phase we adjust the in-memory superblock information, and
 263  * initialize any new parts of the inode table.  The new parts of the
 264  * inode table are created in virgin disk space, so we can abort here
 265  * without any side effects.
 266  * --------------------------------------------------------------------
 267  */
 268
 269 /*
 270  * If the group descriptor's bitmap and inode table blocks are valid,
 271  * release them in the new filesystem data structure, and mark them as
 272  * reserved so the old inode table blocks don't get overwritten.
 273  */
 274 static void free_gdp_blocks(ext2_filsys fs,
 275                             ext2fs_block_bitmap reserve_blocks,
 276                             struct ext2_group_desc *gdp)
 277 {
 278         blk_t   blk;
 279         int     j;
 280
 281         if (gdp->bg_block_bitmap &&
 282             (gdp->bg_block_bitmap < ext2fs_blocks_count(fs->super))) {
 283                 ext2fs_block_alloc_stats(fs, gdp->bg_block_bitmap, -1);
 284                 ext2fs_mark_block_bitmap2(reserve_blocks,
 285                                          gdp->bg_block_bitmap);
 286         }
 287
 288         if (gdp->bg_inode_bitmap &&
 289             (gdp->bg_inode_bitmap < ext2fs_blocks_count(fs->super))) {
 290                 ext2fs_block_alloc_stats(fs, gdp->bg_inode_bitmap, -1);
 291                 ext2fs_mark_block_bitmap2(reserve_blocks,
 292                                          gdp->bg_inode_bitmap);
 293         }
 294
 295         if (gdp->bg_inode_table == 0 ||
 296             (gdp->bg_inode_table >= ext2fs_blocks_count(fs->super)))
 297                 return;
 298
 299         for (blk = gdp->bg_inode_table, j = 0;
 300              j < fs->inode_blocks_per_group; j++, blk++) {
 301                 if (blk >= ext2fs_blocks_count(fs->super))
 302                         break;
 303                 ext2fs_block_alloc_stats(fs, blk, -1);
 304                 ext2fs_mark_block_bitmap2(reserve_blocks, blk);
 305         }
 306 }
 307
 308 /*
 309  * This routine is shared by the online and offline resize routines.
 310  * All of the information which is adjusted in memory is done here.
 311  */
 312 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
 313                          ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
 314 {
 315         errcode_t       retval;
 316         blk64_t         overhead = 0;
 317         blk64_t         rem;
 318         blk64_t         blk, group_block;
 319         blk64_t         real_end;
 320         blk64_t         old_numblocks, numblocks, adjblocks;
 321         unsigned long   i, j, old_desc_blocks;
 322         unsigned int    meta_bg, meta_bg_size;
 323         int             has_super, csum_flag;
 324         unsigned long long new_inodes;  /* u64 to check for overflow */
 325         double          percent;
 326
 327         ext2fs_blocks_count_set(fs->super, new_size);
 328
 329 retry:
 330         fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
 331                                        fs->super->s_first_data_block,
 332                                        EXT2_BLOCKS_PER_GROUP(fs->super));
 333         if (fs->group_desc_count == 0)
 334                 return EXT2_ET_TOOSMALL;
 335         fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
 336                                           EXT2_DESC_PER_BLOCK(fs->super));
 337
 338         /*
 339          * Overhead is the number of bookkeeping blocks per group.  It
 340          * includes the superblock backup, the group descriptor
 341          * backups, the inode bitmap, the block bitmap, and the inode
 342          * table.
 343          */
 344         overhead = (int) (2 + fs->inode_blocks_per_group);
 345
 346         if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
 347                 overhead += 1 + fs->desc_blocks +
 348                         fs->super->s_reserved_gdt_blocks;
 349
 350         /*
 351          * See if the last group is big enough to support the
 352          * necessary data structures.  If not, we need to get rid of
 353          * it.
 354          */
 355         rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
 356                 fs->super->s_blocks_per_group;
 357         if ((fs->group_desc_count == 1) && rem && (rem < overhead))
 358                 return EXT2_ET_TOOSMALL;
 359         if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
 360                 ext2fs_blocks_count_set(fs->super,
 361                                         ext2fs_blocks_count(fs->super) - rem);
 362                 goto retry;
 363         }
 364         /*
 365          * Adjust the number of inodes
 366          */
 367         new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
 368         if (new_inodes > ~0U) {
 369                 fprintf(stderr, _("inodes (%llu) must be less than %u"),
 370                                    new_inodes, ~0U);
 371                 return EXT2_ET_TOO_MANY_INODES;
 372         }
 373         fs->super->s_inodes_count = fs->super->s_inodes_per_group *
 374                 fs->group_desc_count;
 375
 376         /*
 377          * Adjust the number of free blocks
 378          */
 379         blk = ext2fs_blocks_count(old_fs->super);
 380         if (blk > ext2fs_blocks_count(fs->super))
 381                 ext2fs_free_blocks_count_set(fs->super,
 382                         ext2fs_free_blocks_count(fs->super) -
 383                         (blk - ext2fs_blocks_count(fs->super)));
 384         else
 385                 ext2fs_free_blocks_count_set(fs->super,
 386                         ext2fs_free_blocks_count(fs->super) +
 387                         (ext2fs_blocks_count(fs->super) - blk));
 388
 389         /*
 390          * Adjust the number of reserved blocks
 391          */
 392         percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
 393                 ext2fs_blocks_count(old_fs->super);
 394         ext2fs_r_blocks_count_set(fs->super,
 395                                   (percent * ext2fs_blocks_count(fs->super) /
 396                                    100.0));
 397
 398         /*
 399          * Adjust the bitmaps for size
 400          */
 401         retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
 402                                             fs->super->s_inodes_count,
 403                                             fs->inode_map);
 404         if (retval) goto errout;
 405
 406         real_end = (((blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super) *
 407                      fs->group_desc_count)) - 1 +
 408                 fs->super->s_first_data_block;
 409         retval = ext2fs_resize_block_bitmap2(new_size - 1,
 410                                              real_end, fs->block_map);
 411         if (retval) goto errout;
 412
 413         /*
 414          * If we are growing the file system, also grow the size of
 415          * the reserve_blocks bitmap
 416          */
 417         if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
 418                 retval = ext2fs_resize_block_bitmap2(new_size - 1,
 419                                                      real_end, reserve_blocks);
 420                 if (retval) goto errout;
 421         }
 422
 423         /*
 424          * Reallocate the group descriptors as necessary.
 425          */
 426         if (old_fs->desc_blocks != fs->desc_blocks) {
 427                 retval = ext2fs_resize_mem(old_fs->desc_blocks *
 428                                            fs->blocksize,
 429                                            fs->desc_blocks * fs->blocksize,
 430                                            &fs->group_desc);
 431                 if (retval)
 432                         goto errout;
 433                 if (fs->desc_blocks > old_fs->desc_blocks)
 434                         memset((char *) fs->group_desc +
 435                                (old_fs->desc_blocks * fs->blocksize), 0,
 436                                (fs->desc_blocks - old_fs->desc_blocks) *
 437                                fs->blocksize);
 438         }
 439
 440         /*
 441          * If the resize_inode feature is set, and we are changing the
 442          * number of descriptor blocks, then adjust
 443          * s_reserved_gdt_blocks if possible to avoid needing to move
 444          * the inode table either now or in the future.
 445          */
 446         if ((fs->super->s_feature_compat &
 447              EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
 448             (old_fs->desc_blocks != fs->desc_blocks)) {
 449                 int new;
 450
 451                 new = ((int) fs->super->s_reserved_gdt_blocks) +
 452                         (old_fs->desc_blocks - fs->desc_blocks);
 453                 if (new < 0)
 454                         new = 0;
 455                 if (new > (int) fs->blocksize/4)
 456                         new = fs->blocksize/4;
 457                 fs->super->s_reserved_gdt_blocks = new;
 458         }
 459
 460         /*
 461          * If we are shrinking the number of block groups, we're done
 462          * and can exit now.
 463          */
 464         if (old_fs->group_desc_count > fs->group_desc_count) {
 465                 /*
 466                  * Check the block groups that we are chopping off
 467                  * and free any blocks associated with their metadata
 468                  */
 469                 for (i = fs->group_desc_count;
 470                      i < old_fs->group_desc_count; i++) {
 471                         free_gdp_blocks(fs, reserve_blocks,
 472                                         ext2fs_group_desc(old_fs,
 473                                                 old_fs->group_desc, i));
 474                 }
 475                 retval = 0;
 476                 goto errout;
 477         }
 478
 479         /*
 480          * Fix the count of the last (old) block group
 481          */
 482         old_numblocks = (ext2fs_blocks_count(old_fs->super) -
 483                          old_fs->super->s_first_data_block) %
 484                                  old_fs->super->s_blocks_per_group;
 485         if (!old_numblocks)
 486                 old_numblocks = old_fs->super->s_blocks_per_group;
 487         if (old_fs->group_desc_count == fs->group_desc_count) {
 488                 numblocks = (ext2fs_blocks_count(fs->super) -
 489                              fs->super->s_first_data_block) %
 490                         fs->super->s_blocks_per_group;
 491                 if (!numblocks)
 492                         numblocks = fs->super->s_blocks_per_group;
 493         } else
 494                 numblocks = fs->super->s_blocks_per_group;
 495         i = old_fs->group_desc_count - 1;
 496         ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
 497         ext2fs_group_desc_csum_set(fs, i);
 498
 499         /*
 500          * If the number of block groups is staying the same, we're
 501          * done and can exit now.  (If the number block groups is
 502          * shrinking, we had exited earlier.)
 503          */
 504         if (old_fs->group_desc_count >= fs->group_desc_count) {
 505                 retval = 0;
 506                 goto errout;
 507         }
 508
 509         /*
 510          * Initialize the new block group descriptors
 511          */
 512         group_block = ext2fs_group_first_block2(fs,
 513                                                 old_fs->group_desc_count);
 514         csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 515                                                EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
 516         if (access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0)
 517                 lazy_itable_init = 1;
 518         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
 519                 old_desc_blocks = fs->super->s_first_meta_bg;
 520         else
 521                 old_desc_blocks = fs->desc_blocks +
 522                         fs->super->s_reserved_gdt_blocks;
 523
 524         /*
 525          * If we changed the number of block_group descriptor blocks,
 526          * we need to make sure they are all marked as reserved in the
 527          * file systems's block allocation map.
 528          */
 529         for (i = 0; i < old_fs->group_desc_count; i++)
 530                 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
 531
 532         for (i = old_fs->group_desc_count;
 533              i < fs->group_desc_count; i++) {
 534                 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
 535                        sizeof(struct ext2_group_desc));
 536                 adjblocks = 0;
 537
 538                 ext2fs_bg_flags_zap(fs, i);
 539                 if (csum_flag) {
 540                         ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
 541                         if (!lazy_itable_init)
 542                                 ext2fs_bg_flags_set(fs, i,
 543                                                     EXT2_BG_INODE_ZEROED);
 544                         ext2fs_bg_itable_unused_set(fs, i,
 545                                         fs->super->s_inodes_per_group);
 546                 }
 547
 548                 numblocks = ext2fs_group_blocks_count(fs, i);
 549                 if ((i < fs->group_desc_count - 1) && csum_flag)
 550                         ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
 551
 552                 has_super = ext2fs_bg_has_super(fs, i);
 553                 if (has_super) {
 554                         ext2fs_block_alloc_stats2(fs, group_block, +1);
 555                         adjblocks++;
 556                 }
 557                 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
 558                 meta_bg = i / meta_bg_size;
 559                 if (!(fs->super->s_feature_incompat &
 560                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 561                     (meta_bg < fs->super->s_first_meta_bg)) {
 562                         if (has_super) {
 563                                 for (j=0; j < old_desc_blocks; j++)
 564                                         ext2fs_block_alloc_stats2(fs,
 565                                                  group_block + 1 + j, +1);
 566                                 adjblocks += old_desc_blocks;
 567                         }
 568                 } else {
 569                         if (has_super)
 570                                 has_super = 1;
 571                         if (((i % meta_bg_size) == 0) ||
 572                             ((i % meta_bg_size) == 1) ||
 573                             ((i % meta_bg_size) == (meta_bg_size-1)))
 574                                 ext2fs_block_alloc_stats2(fs,
 575                                                  group_block + has_super, +1);
 576                 }
 577
 578                 adjblocks += 2 + fs->inode_blocks_per_group;
 579
 580                 numblocks -= adjblocks;
 581                 ext2fs_free_blocks_count_set(fs->super,
 582                              ext2fs_free_blocks_count(fs->super) - adjblocks);
 583                 fs->super->s_free_inodes_count +=
 584                         fs->super->s_inodes_per_group;
 585                 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
 586                 ext2fs_bg_free_inodes_count_set(fs, i,
 587                                                 fs->super->s_inodes_per_group);
 588                 ext2fs_bg_used_dirs_count_set(fs, i, 0);
 589                 ext2fs_group_desc_csum_set(fs, i);
 590
 591                 retval = ext2fs_allocate_group_table(fs, i, 0);
 592                 if (retval) goto errout;
 593
 594                 group_block += fs->super->s_blocks_per_group;
 595         }
 596         retval = 0;
 597
 598         /*
 599          * Mark all of the metadata blocks as reserved so they won't
 600          * get allocated by the call to ext2fs_allocate_group_table()
 601          * in blocks_to_move(), where we allocate new blocks to
 602          * replace those allocation bitmap and inode table blocks
 603          * which have to get relocated to make space for an increased
 604          * number of the block group descriptors.
 605          */
 606         if (reserve_blocks)
 607                 mark_table_blocks(fs, reserve_blocks);
 608
 609 errout:
 610         return (retval);
 611 }
 612
 613 /*
 614  * This routine adjusts the superblock and other data structures, both
 615  * in disk as well as in memory...
 616  */
 617 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
 618 {
 619         ext2_filsys fs;
 620         int             adj = 0;
 621         errcode_t       retval;
 622         blk64_t         group_block;
 623         unsigned long   i;
 624         unsigned long   max_group;
 625
 626         fs = rfs->new_fs;
 627         ext2fs_mark_super_dirty(fs);
 628         ext2fs_mark_bb_dirty(fs);
 629         ext2fs_mark_ib_dirty(fs);
 630
 631         retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
 632                                               &rfs->reserve_blocks);
 633         if (retval)
 634                 return retval;
 635
 636         retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
 637         if (retval)
 638                 goto errout;
 639
 640         /*
 641          * Check to make sure there are enough inodes
 642          */
 643         if ((rfs->old_fs->super->s_inodes_count -
 644              rfs->old_fs->super->s_free_inodes_count) >
 645             rfs->new_fs->super->s_inodes_count) {
 646                 retval = ENOSPC;
 647                 goto errout;
 648         }
 649
 650         /*
 651          * If we are shrinking the number block groups, we're done and
 652          * can exit now.
 653          */
 654         if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
 655                 retval = 0;
 656                 goto errout;
 657         }
 658
 659         /*
 660          * If the number of block groups is staying the same, we're
 661          * done and can exit now.  (If the number block groups is
 662          * shrinking, we had exited earlier.)
 663          */
 664         if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
 665                 retval = 0;
 666                 goto errout;
 667         }
 668
 669         /*
 670          * If we are using uninit_bg (aka GDT_CSUM) and the kernel
 671          * supports lazy inode initialization, we can skip
 672          * initializing the inode table.
 673          */
 674         if (lazy_itable_init &&
 675             EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 676                                        EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
 677                 retval = 0;
 678                 goto errout;
 679         }
 680
 681         /*
 682          * Initialize the inode table
 683          */
 684         retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
 685                                 &rfs->itable_buf);
 686         if (retval)
 687                 goto errout;
 688
 689         memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
 690         group_block = ext2fs_group_first_block2(fs,
 691                                                 rfs->old_fs->group_desc_count);
 692         adj = rfs->old_fs->group_desc_count;
 693         max_group = fs->group_desc_count - adj;
 694         if (rfs->progress) {
 695                 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 696                                        0, max_group);
 697                 if (retval)
 698                         goto errout;
 699         }
 700         for (i = rfs->old_fs->group_desc_count;
 701              i < fs->group_desc_count; i++) {
 702                 /*
 703                  * Write out the new inode table
 704                  */
 705                 retval = io_channel_write_blk64(fs->io,
 706                                                 ext2fs_inode_table_loc(fs, i),
 707                                                 fs->inode_blocks_per_group,
 708                                                 rfs->itable_buf);
 709                 if (retval) goto errout;
 710
 711                 io_channel_flush(fs->io);
 712                 if (rfs->progress) {
 713                         retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
 714                                                i - adj + 1, max_group);
 715                         if (retval)
 716                                 goto errout;
 717                 }
 718                 group_block += fs->super->s_blocks_per_group;
 719         }
 720         io_channel_flush(fs->io);
 721         retval = 0;
 722
 723 errout:
 724         return retval;
 725 }
 726
 727 /* --------------------------------------------------------------------
 728  *
 729  * Resize processing, phase 2.
 730  *
 731  * In this phase we adjust determine which blocks need to be moved, in
 732  * blocks_to_move().  We then copy the blocks to their ultimate new
 733  * destinations using block_mover().  Since we are copying blocks to
 734  * their new locations, again during this pass we can abort without
 735  * any problems.
 736  * --------------------------------------------------------------------
 737  */
 738
 739 /*
 740  * This helper function creates a block bitmap with all of the
 741  * filesystem meta-data blocks.
 742  */
 743 static errcode_t mark_table_blocks(ext2_filsys fs,
 744                                    ext2fs_block_bitmap bmap)
 745 {
 746         dgrp_t                  i;
 747         blk64_t                 blk;
 748
 749         for (i = 0; i < fs->group_desc_count; i++) {
 750                 ext2fs_reserve_super_and_bgd(fs, i, bmap);
 751
 752                 /*
 753                  * Mark the blocks used for the inode table
 754                  */
 755                 blk = ext2fs_inode_table_loc(fs, i);
 756                 if (blk)
 757                         ext2fs_mark_block_bitmap_range2(bmap, blk,
 758                                                 fs->inode_blocks_per_group);
 759
 760                 /*
 761                  * Mark block used for the block bitmap
 762                  */
 763                 blk = ext2fs_block_bitmap_loc(fs, i);
 764                 if (blk)
 765                         ext2fs_mark_block_bitmap2(bmap, blk);
 766
 767                 /*
 768                  * Mark block used for the inode bitmap
 769                  */
 770                 blk = ext2fs_inode_bitmap_loc(fs, i);
 771                 if (blk)
 772                         ext2fs_mark_block_bitmap2(bmap, blk);
 773         }
 774         return 0;
 775 }
 776
 777 /*
 778  * This function checks to see if a particular block (either a
 779  * superblock or a block group descriptor) overlaps with an inode or
 780  * block bitmap block, or with the inode table.
 781  */
 782 static void mark_fs_metablock(ext2_resize_t rfs,
 783                               ext2fs_block_bitmap meta_bmap,
 784                               int group, blk64_t blk)
 785 {
 786         ext2_filsys     fs = rfs->new_fs;
 787
 788         ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
 789         ext2fs_block_alloc_stats2(fs, blk, +1);
 790
 791         /*
 792          * Check to see if we overlap with the inode or block bitmap,
 793          * or the inode tables.  If not, and the block is in use, then
 794          * mark it as a block to be moved.
 795          */
 796         if (IS_BLOCK_BM(fs, group, blk)) {
 797                 ext2fs_block_bitmap_loc_set(fs, group, 0);
 798                 rfs->needed_blocks++;
 799                 return;
 800         }
 801         if (IS_INODE_BM(fs, group, blk)) {
 802                 ext2fs_inode_bitmap_loc_set(fs, group, 0);
 803                 rfs->needed_blocks++;
 804                 return;
 805         }
 806         if (IS_INODE_TB(fs, group, blk)) {
 807                 ext2fs_inode_table_loc_set(fs, group, 0);
 808                 rfs->needed_blocks++;
 809                 return;
 810         }
 811         if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
 812                 dgrp_t i;
 813
 814                 for (i=0; i < rfs->old_fs->group_desc_count; i++) {
 815                         if (IS_BLOCK_BM(fs, i, blk)) {
 816                                 ext2fs_block_bitmap_loc_set(fs, i, 0);
 817                                 rfs->needed_blocks++;
 818                                 return;
 819                         }
 820                         if (IS_INODE_BM(fs, i, blk)) {
 821                                 ext2fs_inode_bitmap_loc_set(fs, i, 0);
 822                                 rfs->needed_blocks++;
 823                                 return;
 824                         }
 825                         if (IS_INODE_TB(fs, i, blk)) {
 826                                 ext2fs_inode_table_loc_set(fs, i, 0);
 827                                 rfs->needed_blocks++;
 828                                 return;
 829                         }
 830                 }
 831         }
 832         if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 833                                        EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
 834                    (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
 835                 /*
 836                  * If the block bitmap is uninitialized, which means
 837                  * nothing other than standard metadata in use.
 838                  */
 839                 return;
 840         } else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
 841                    !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
 842                 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
 843                 rfs->needed_blocks++;
 844         }
 845 }
 846
 847
 848 /*
 849  * This routine marks and unmarks reserved blocks in the new block
 850  * bitmap.  It also determines which blocks need to be moved and
 851  * places this information into the move_blocks bitmap.
 852  */
 853 static errcode_t blocks_to_move(ext2_resize_t rfs)
 854 {
 855         int             j, has_super;
 856         dgrp_t          i, max_groups, g;
 857         blk64_t         blk, group_blk;
 858         blk64_t         old_blocks, new_blocks;
 859         blk64_t         new_size;
 860         unsigned int    meta_bg, meta_bg_size;
 861         errcode_t       retval;
 862         ext2_filsys     fs, old_fs;
 863         ext2fs_block_bitmap     meta_bmap;
 864         int             flex_bg;
 865
 866         fs = rfs->new_fs;
 867         old_fs = rfs->old_fs;
 868         if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
 869                 fs = rfs->old_fs;
 870
 871         retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
 872                                               &rfs->move_blocks);
 873         if (retval)
 874                 return retval;
 875
 876         retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
 877                                               &meta_bmap);
 878         if (retval)
 879                 return retval;
 880
 881         retval = mark_table_blocks(old_fs, meta_bmap);
 882         if (retval)
 883                 return retval;
 884
 885         fs = rfs->new_fs;
 886
 887         /*
 888          * If we're shrinking the filesystem, we need to move any group's
 889          * bitmaps which are beyond the end of the new filesystem.
 890          */
 891         new_size = ext2fs_blocks_count(fs->super);
 892         if (new_size < ext2fs_blocks_count(old_fs->super)) {
 893                 for (g = 0; g < fs->group_desc_count; g++) {
 894                         /*
 895                          * ext2fs_allocate_group_table re-allocates bitmaps
 896                          * which are set to block 0.
 897                          */
 898                         if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
 899                                 ext2fs_block_bitmap_loc_set(fs, g, 0);
 900                                 retval = ext2fs_allocate_group_table(fs, g, 0);
 901                                 if (retval)
 902                                         return retval;
 903                         }
 904                         if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
 905                                 ext2fs_inode_bitmap_loc_set(fs, g, 0);
 906                                 retval = ext2fs_allocate_group_table(fs, g, 0);
 907                                 if (retval)
 908                                         return retval;
 909                         }
 910                 }
 911         }
 912
 913         /*
 914          * If we're shrinking the filesystem, we need to move all of
 915          * the blocks that don't fit any more
 916          */
 917         for (blk = ext2fs_blocks_count(fs->super);
 918              blk < ext2fs_blocks_count(old_fs->super); blk++) {
 919                 g = ext2fs_group_of_blk2(fs, blk);
 920                 if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
 921                                                EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
 922                     ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
 923                         /*
 924                          * The block bitmap is uninitialized, so skip
 925                          * to the next block group.
 926                          */
 927                         blk = ext2fs_group_first_block2(fs, g+1) - 1;
 928                         continue;
 929                 }
 930                 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
 931                     !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
 932                         ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
 933                         rfs->needed_blocks++;
 934                 }
 935                 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
 936         }
 937
 938         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
 939                 old_blocks = old_fs->super->s_first_meta_bg;
 940                 new_blocks = fs->super->s_first_meta_bg;
 941         } else {
 942                 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
 943                 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
 944         }
 945
 946         if (old_blocks == new_blocks) {
 947                 retval = 0;
 948                 goto errout;
 949         }
 950
 951         max_groups = fs->group_desc_count;
 952         if (max_groups > old_fs->group_desc_count)
 953                 max_groups = old_fs->group_desc_count;
 954         group_blk = old_fs->super->s_first_data_block;
 955         /*
 956          * If we're reducing the number of descriptor blocks, this
 957          * makes life easy.  :-)   We just have to mark some extra
 958          * blocks as free.
 959          */
 960         if (old_blocks > new_blocks) {
 961                 for (i = 0; i < max_groups; i++) {
 962                         if (!ext2fs_bg_has_super(fs, i)) {
 963                                 group_blk += fs->super->s_blocks_per_group;
 964                                 continue;
 965                         }
 966                         for (blk = group_blk+1+new_blocks;
 967                              blk < group_blk+1+old_blocks; blk++) {
 968                                 ext2fs_block_alloc_stats2(fs, blk, -1);
 969                                 rfs->needed_blocks--;
 970                         }
 971                         group_blk += fs->super->s_blocks_per_group;
 972                 }
 973                 retval = 0;
 974                 goto errout;
 975         }
 976         /*
 977          * If we're increasing the number of descriptor blocks, life
 978          * gets interesting....
 979          */
 980         meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
 981         flex_bg = fs->super->s_feature_incompat &
 982                 EXT4_FEATURE_INCOMPAT_FLEX_BG;
 983         /* first reserve all of the existing fs meta blocks */
 984         for (i = 0; i < max_groups; i++) {
 985                 has_super = ext2fs_bg_has_super(fs, i);
 986                 if (has_super)
 987                         mark_fs_metablock(rfs, meta_bmap, i, group_blk);
 988
 989                 meta_bg = i / meta_bg_size;
 990                 if (!(fs->super->s_feature_incompat &
 991                       EXT2_FEATURE_INCOMPAT_META_BG) ||
 992                     (meta_bg < fs->super->s_first_meta_bg)) {
 993                         if (has_super) {
 994                                 for (blk = group_blk+1;
 995                                      blk < group_blk + 1 + new_blocks; blk++)
 996                                         mark_fs_metablock(rfs, meta_bmap,
 997                                                           i, blk);
 998                         }
 999                 } else {
1000                         if (has_super)
1001                                 has_super = 1;
1002                         if (((i % meta_bg_size) == 0) ||
1003                             ((i % meta_bg_size) == 1) ||
1004                             ((i % meta_bg_size) == (meta_bg_size-1)))
1005                                 mark_fs_metablock(rfs, meta_bmap, i,
1006                                                   group_blk + has_super);
1007                 }
1008
1009                 /*
1010                  * Reserve the existing meta blocks that we know
1011                  * aren't to be moved.
1012                  *
1013                  * For flex_bg file systems, in order to avoid
1014                  * overwriting fs metadata (especially inode table
1015                  * blocks) belonging to a different block group when
1016                  * we are relocating the inode tables, we need to
1017                  * reserve all existing fs metadata blocks.
1018                  */
1019                 if (ext2fs_block_bitmap_loc(fs, i))
1020                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1021                                  ext2fs_block_bitmap_loc(fs, i));
1022                 else if (flex_bg && i < old_fs->group_desc_count)
1023                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1024                                  ext2fs_block_bitmap_loc(old_fs, i));
1025
1026                 if (ext2fs_inode_bitmap_loc(fs, i))
1027                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1028                                  ext2fs_inode_bitmap_loc(fs, i));
1029                 else if (flex_bg && i < old_fs->group_desc_count)
1030                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1031                                  ext2fs_inode_bitmap_loc(old_fs, i));
1032
1033                 if (ext2fs_inode_table_loc(fs, i))
1034                         ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1035                                         ext2fs_inode_table_loc(fs, i),
1036                                         fs->inode_blocks_per_group);
1037                 else if (flex_bg && i < old_fs->group_desc_count)
1038                         ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1039                                         ext2fs_inode_table_loc(old_fs, i),
1040                                         old_fs->inode_blocks_per_group);
1041
1042                 group_blk += rfs->new_fs->super->s_blocks_per_group;
1043         }
1044
1045         /* Allocate the missing data structures */
1046         for (i = 0; i < max_groups; i++) {
1047                 if (ext2fs_inode_table_loc(fs, i) &&
1048                     ext2fs_inode_bitmap_loc(fs, i) &&
1049                     ext2fs_block_bitmap_loc(fs, i))
1050                         continue;
1051
1052                 retval = ext2fs_allocate_group_table(fs, i,
1053                                                      rfs->reserve_blocks);
1054                 if (retval)
1055                         goto errout;
1056
1057                 /*
1058                  * For those structures that have changed, we need to
1059                  * do bookkeepping.
1060                  */
1061                 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1062                     (blk = ext2fs_block_bitmap_loc(fs, i))) {
1063                         ext2fs_block_alloc_stats2(fs, blk, +1);
1064                         if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1065                             !ext2fs_test_block_bitmap2(meta_bmap, blk))
1066                                 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1067                                                          blk);
1068                 }
1069                 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1070                     (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1071                         ext2fs_block_alloc_stats2(fs, blk, +1);
1072                         if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1073                             !ext2fs_test_block_bitmap2(meta_bmap, blk))
1074                                 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1075                                                          blk);
1076                 }
1077
1078                 /*
1079                  * The inode table, if we need to relocate it, is
1080                  * handled specially.  We have to reserve the blocks
1081                  * for both the old and the new inode table, since we
1082                  * can't have the inode table be destroyed during the
1083                  * block relocation phase.
1084                  */
1085                 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1086                         continue;       /* inode table not moved */
1087
1088                 rfs->needed_blocks += fs->inode_blocks_per_group;
1089
1090                 /*
1091                  * Mark the new inode table as in use in the new block
1092                  * allocation bitmap, and move any blocks that might
1093                  * be necessary.
1094                  */
1095                 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1096                      j < fs->inode_blocks_per_group ; j++, blk++) {
1097                         ext2fs_block_alloc_stats2(fs, blk, +1);
1098                         if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1099                             !ext2fs_test_block_bitmap2(meta_bmap, blk))
1100                                 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1101                                                          blk);
1102                 }
1103
1104                 /*
1105                  * Make sure the old inode table is reserved in the
1106                  * block reservation bitmap.
1107                  */
1108                 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1109                      j < fs->inode_blocks_per_group ; j++, blk++)
1110                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1111         }
1112         retval = 0;
1113
1114 errout:
1115         if (meta_bmap)
1116                 ext2fs_free_block_bitmap(meta_bmap);
1117
1118         return retval;
1119 }
1120
1121 /*
1122  * This helper function tries to allocate a new block.  We try to
1123  * avoid hitting the original group descriptor blocks at least at
1124  * first, since we want to make it possible to recover from a badly
1125  * aborted resize operation as much as possible.
1126  *
1127  * In the future, I may further modify this routine to balance out
1128  * where we get the new blocks across the various block groups.
1129  * Ideally we would allocate blocks that corresponded with the block
1130  * group of the containing inode, and keep contiguous blocks
1131  * together.  However, this very difficult to do efficiently, since we
1132  * don't have the necessary information up front.
1133  */
1134
1135 #define AVOID_OLD       1
1136 #define DESPERATION     2
1137
1138 static void init_block_alloc(ext2_resize_t rfs)
1139 {
1140         rfs->alloc_state = AVOID_OLD;
1141         rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1142 #if 0
1143         /* HACK for testing */
1144         if (ext2fs_blocks_count(rfs->new_fs->super) >
1145             ext2fs_blocks_count(rfs->old_fs->super))
1146                 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1147 #endif
1148 }
1149
1150 static blk64_t get_new_block(ext2_resize_t rfs)
1151 {
1152         ext2_filsys     fs = rfs->new_fs;
1153
1154         while (1) {
1155                 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1156                         if (rfs->alloc_state == DESPERATION)
1157                                 return 0;
1158
1159 #ifdef RESIZE2FS_DEBUG
1160                         if (rfs->flags & RESIZE_DEBUG_BMOVE)
1161                                 printf("Going into desperation mode "
1162                                        "for block allocations\n");
1163 #endif
1164                         rfs->alloc_state = DESPERATION;
1165                         rfs->new_blk = fs->super->s_first_data_block;
1166                         continue;
1167                 }
1168                 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1169                     ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1170                                              rfs->new_blk) ||
1171                     ((rfs->alloc_state == AVOID_OLD) &&
1172                      (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1173                      ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1174                                               rfs->new_blk))) {
1175                         rfs->new_blk++;
1176                         continue;
1177                 }
1178                 return rfs->new_blk;
1179         }
1180 }
1181
1182 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs, blk64_t goal,
1183                                            blk64_t *ret)
1184 {
1185         ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1186         blk64_t blk;
1187
1188         blk = get_new_block(rfs);
1189         if (!blk)
1190                 return ENOSPC;
1191
1192 #ifdef RESIZE2FS_DEBUG
1193         if (rfs->flags & 0xF)
1194                 printf("get_alloc_block allocating %llu\n", blk);
1195 #endif
1196
1197         ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1198         ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1199         *ret = (blk64_t) blk;
1200         return 0;
1201 }
1202
1203 static errcode_t block_mover(ext2_resize_t rfs)
1204 {
1205         blk64_t                 blk, old_blk, new_blk;
1206         ext2_filsys             fs = rfs->new_fs;
1207         ext2_filsys             old_fs = rfs->old_fs;
1208         errcode_t               retval;
1209         __u64                   size;
1210         int                     c;
1211         int                     to_move, moved;
1212         ext2_badblocks_list     badblock_list = 0;
1213         int                     bb_modified = 0;
1214
1215         fs->get_alloc_block = resize2fs_get_alloc_block;
1216         old_fs->get_alloc_block = resize2fs_get_alloc_block;
1217
1218         retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1219         if (retval)
1220                 return retval;
1221
1222         new_blk = fs->super->s_first_data_block;
1223         if (!rfs->itable_buf) {
1224                 retval = ext2fs_get_array(fs->blocksize,
1225                                         fs->inode_blocks_per_group,
1226                                         &rfs->itable_buf);
1227                 if (retval)
1228                         return retval;
1229         }
1230         retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1231         if (retval)
1232                 return retval;
1233
1234         /*
1235          * The first step is to figure out where all of the blocks
1236          * will go.
1237          */
1238         to_move = moved = 0;
1239         init_block_alloc(rfs);
1240         for (blk = B2C(old_fs->super->s_first_data_block);
1241              blk < ext2fs_blocks_count(old_fs->super);
1242              blk += EXT2FS_CLUSTER_RATIO(fs)) {
1243                 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1244                         continue;
1245                 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1246                         continue;
1247                 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1248                         ext2fs_badblocks_list_del(badblock_list, blk);
1249                         bb_modified++;
1250                         continue;
1251                 }
1252
1253                 new_blk = get_new_block(rfs);
1254                 if (!new_blk) {
1255                         retval = ENOSPC;
1256                         goto errout;
1257                 }
1258                 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1259                 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1260                 to_move++;
1261         }
1262
1263         if (to_move == 0) {
1264                 if (rfs->bmap) {
1265                         ext2fs_free_extent_table(rfs->bmap);
1266                         rfs->bmap = 0;
1267                 }
1268                 retval = 0;
1269                 goto errout;
1270         }
1271
1272         /*
1273          * Step two is to actually move the blocks
1274          */
1275         retval =  ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1276         if (retval) goto errout;
1277
1278         if (rfs->progress) {
1279                 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1280                                          0, to_move);
1281                 if (retval)
1282                         goto errout;
1283         }
1284         while (1) {
1285                 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1286                 if (retval) goto errout;
1287                 if (!size)
1288                         break;
1289                 old_blk = C2B(old_blk);
1290                 new_blk = C2B(new_blk);
1291                 size = C2B(size);
1292 #ifdef RESIZE2FS_DEBUG
1293                 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1294                         printf("Moving %llu blocks %llu->%llu\n",
1295                                size, old_blk, new_blk);
1296 #endif
1297                 do {
1298                         c = size;
1299                         if (c > fs->inode_blocks_per_group)
1300                                 c = fs->inode_blocks_per_group;
1301                         retval = io_channel_read_blk64(fs->io, old_blk, c,
1302                                                        rfs->itable_buf);
1303                         if (retval) goto errout;
1304                         retval = io_channel_write_blk64(fs->io, new_blk, c,
1305                                                         rfs->itable_buf);
1306                         if (retval) goto errout;
1307                         size -= c;
1308                         new_blk += c;
1309                         old_blk += c;
1310                         moved += c;
1311                         if (rfs->progress) {
1312                                 io_channel_flush(fs->io);
1313                                 retval = (rfs->progress)(rfs,
1314                                                 E2_RSZ_BLOCK_RELOC_PASS,
1315                                                 moved, to_move);
1316                                 if (retval)
1317                                         goto errout;
1318                         }
1319                 } while (size > 0);
1320                 io_channel_flush(fs->io);
1321         }
1322
1323 errout:
1324         if (badblock_list) {
1325                 if (!retval && bb_modified)
1326                         retval = ext2fs_update_bb_inode(old_fs,
1327                                                         badblock_list);
1328                 ext2fs_badblocks_list_free(badblock_list);
1329         }
1330         return retval;
1331 }
1332
1333
1334 /* --------------------------------------------------------------------
1335  *
1336  * Resize processing, phase 3
1337  *
1338  * --------------------------------------------------------------------
1339  */
1340
1341
1342 /*
1343  * The extent translation table is stored in clusters so we need to
1344  * take special care when mapping a source block number to its
1345  * destination block number.
1346  */
1347 __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1348 {
1349         __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1350
1351         if (new_block != 0)
1352                 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1353         return new_block;
1354 }
1355
1356 struct process_block_struct {
1357         ext2_resize_t           rfs;
1358         ext2_ino_t              ino;
1359         struct ext2_inode *     inode;
1360         errcode_t               error;
1361         int                     is_dir;
1362         int                     changed;
1363 };
1364
1365 static int process_block(ext2_filsys fs, blk64_t        *block_nr,
1366                          e2_blkcnt_t blockcnt,
1367                          blk64_t ref_block EXT2FS_ATTR((unused)),
1368                          int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1369 {
1370         struct process_block_struct *pb;
1371         errcode_t       retval;
1372         blk64_t         block, new_block;
1373         int             ret = 0;
1374
1375         pb = (struct process_block_struct *) priv_data;
1376         block = *block_nr;
1377         if (pb->rfs->bmap) {
1378                 new_block = extent_translate(fs, pb->rfs->bmap, block);
1379                 if (new_block) {
1380                         *block_nr = new_block;
1381                         ret |= BLOCK_CHANGED;
1382                         pb->changed = 1;
1383 #ifdef RESIZE2FS_DEBUG
1384                         if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1385                                 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1386                                        pb->ino, blockcnt, block, new_block);
1387 #endif
1388                         block = new_block;
1389                 }
1390         }
1391         if (pb->is_dir) {
1392                 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1393                                                block, (int) blockcnt);
1394                 if (retval) {
1395                         pb->error = retval;
1396                         ret |= BLOCK_ABORT;
1397                 }
1398         }
1399         return ret;
1400 }
1401
1402 /*
1403  * Progress callback
1404  */
1405 static errcode_t progress_callback(ext2_filsys fs,
1406                                    ext2_inode_scan scan EXT2FS_ATTR((unused)),
1407                                    dgrp_t group, void * priv_data)
1408 {
1409         ext2_resize_t rfs = (ext2_resize_t) priv_data;
1410         errcode_t               retval;
1411
1412         /*
1413          * This check is to protect against old ext2 libraries.  It
1414          * shouldn't be needed against new libraries.
1415          */
1416         if ((group+1) == 0)
1417                 return 0;
1418
1419         if (rfs->progress) {
1420                 io_channel_flush(fs->io);
1421                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1422                                          group+1, fs->group_desc_count);
1423                 if (retval)
1424                         return retval;
1425         }
1426
1427         return 0;
1428 }
1429
1430 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1431 {
1432         struct process_block_struct     pb;
1433         ext2_ino_t              ino, new_inode;
1434         struct ext2_inode       *inode = NULL;
1435         ext2_inode_scan         scan = NULL;
1436         errcode_t               retval;
1437         char                    *block_buf = 0;
1438         ext2_ino_t              start_to_move;
1439         blk64_t                 orig_size;
1440         blk64_t                 new_block;
1441         int                     inode_size;
1442
1443         if ((rfs->old_fs->group_desc_count <=
1444              rfs->new_fs->group_desc_count) &&
1445             !rfs->bmap)
1446                 return 0;
1447
1448         /*
1449          * Save the original size of the old filesystem, and
1450          * temporarily set the size to be the new size if the new size
1451          * is larger.  We need to do this to avoid catching an error
1452          * by the block iterator routines
1453          */
1454         orig_size = ext2fs_blocks_count(rfs->old_fs->super);
1455         if (orig_size < ext2fs_blocks_count(rfs->new_fs->super))
1456                 ext2fs_blocks_count_set(rfs->old_fs->super,
1457                                 ext2fs_blocks_count(rfs->new_fs->super));
1458
1459         retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1460         if (retval) goto errout;
1461
1462         retval = ext2fs_init_dblist(rfs->old_fs, 0);
1463         if (retval) goto errout;
1464         retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
1465         if (retval) goto errout;
1466
1467         start_to_move = (rfs->new_fs->group_desc_count *
1468                          rfs->new_fs->super->s_inodes_per_group);
1469
1470         if (rfs->progress) {
1471                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1472                                          0, rfs->old_fs->group_desc_count);
1473                 if (retval)
1474                         goto errout;
1475         }
1476         ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1477         pb.rfs = rfs;
1478         pb.inode = inode;
1479         pb.error = 0;
1480         new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1481         inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
1482         inode = malloc(inode_size);
1483         if (!inode) {
1484                 retval = ENOMEM;
1485                 goto errout;
1486         }
1487         /*
1488          * First, copy all of the inodes that need to be moved
1489          * elsewhere in the inode table
1490          */
1491         while (1) {
1492                 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
1493                 if (retval) goto errout;
1494                 if (!ino)
1495                         break;
1496
1497                 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
1498                         continue; /* inode not in use */
1499
1500                 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
1501                 pb.changed = 0;
1502
1503                 if (ext2fs_file_acl_block(rfs->old_fs, inode) && rfs->bmap) {
1504                         new_block = extent_translate(rfs->old_fs, rfs->bmap,
1505                                 ext2fs_file_acl_block(rfs->old_fs, inode));
1506                         if (new_block) {
1507                                 ext2fs_file_acl_block_set(rfs->old_fs, inode,
1508                                                           new_block);
1509                                 retval = ext2fs_write_inode_full(rfs->old_fs,
1510                                                             ino, inode, inode_size);
1511                                 if (retval) goto errout;
1512                         }
1513                 }
1514
1515                 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
1516                     (rfs->bmap || pb.is_dir)) {
1517                         pb.ino = ino;
1518                         retval = ext2fs_block_iterate3(rfs->old_fs,
1519                                                        ino, 0, block_buf,
1520                                                        process_block, &pb);
1521                         if (retval)
1522                                 goto errout;
1523                         if (pb.error) {
1524                                 retval = pb.error;
1525                                 goto errout;
1526                         }
1527                 }
1528
1529                 if (ino <= start_to_move)
1530                         continue; /* Don't need to move it. */
1531
1532                 /*
1533                  * Find a new inode
1534                  */
1535                 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
1536                 if (retval)
1537                         goto errout;
1538
1539                 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
1540                                           pb.is_dir);
1541                 if (pb.changed) {
1542                         /* Get the new version of the inode */
1543                         retval = ext2fs_read_inode_full(rfs->old_fs, ino,
1544                                                 inode, inode_size);
1545                         if (retval) goto errout;
1546                 }
1547                 inode->i_ctime = time(0);
1548                 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
1549                                                 inode, inode_size);
1550                 if (retval) goto errout;
1551
1552 #ifdef RESIZE2FS_DEBUG
1553                 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1554                         printf("Inode moved %u->%u\n", ino, new_inode);
1555 #endif
1556                 if (!rfs->imap) {
1557                         retval = ext2fs_create_extent_table(&rfs->imap, 0);
1558                         if (retval)
1559                                 goto errout;
1560                 }
1561                 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1562         }
1563         io_channel_flush(rfs->old_fs->io);
1564
1565 errout:
1566         ext2fs_blocks_count_set(rfs->old_fs->super, orig_size);
1567         if (rfs->bmap) {
1568                 ext2fs_free_extent_table(rfs->bmap);
1569                 rfs->bmap = 0;
1570         }
1571         if (scan)
1572                 ext2fs_close_inode_scan(scan);
1573         if (block_buf)
1574                 ext2fs_free_mem(&block_buf);
1575         free(inode);
1576         return retval;
1577 }
1578
1579 /* --------------------------------------------------------------------
1580  *
1581  * Resize processing, phase 4.
1582  *
1583  * --------------------------------------------------------------------
1584  */
1585
1586 struct istruct {
1587         ext2_resize_t rfs;
1588         errcode_t       err;
1589         unsigned int    max_dirs;
1590         unsigned int    num;
1591 };
1592
1593 static int check_and_change_inodes(ext2_ino_t dir,
1594                                    int entry EXT2FS_ATTR((unused)),
1595                                    struct ext2_dir_entry *dirent, int offset,
1596                                    int  blocksize EXT2FS_ATTR((unused)),
1597                                    char *buf EXT2FS_ATTR((unused)),
1598                                    void *priv_data)
1599 {
1600         struct istruct *is = (struct istruct *) priv_data;
1601         struct ext2_inode       inode;
1602         ext2_ino_t              new_inode;
1603         errcode_t               retval;
1604
1605         if (is->rfs->progress && offset == 0) {
1606                 io_channel_flush(is->rfs->old_fs->io);
1607                 is->err = (is->rfs->progress)(is->rfs,
1608                                               E2_RSZ_INODE_REF_UPD_PASS,
1609                                               ++is->num, is->max_dirs);
1610                 if (is->err)
1611                         return DIRENT_ABORT;
1612         }
1613
1614         if (!dirent->inode)
1615                 return 0;
1616
1617         new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1618
1619         if (!new_inode)
1620                 return 0;
1621 #ifdef RESIZE2FS_DEBUG
1622         if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1623                 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1624                        dir, dirent->name_len&0xFF, dirent->name,
1625                        dirent->inode, new_inode);
1626 #endif
1627
1628         dirent->inode = new_inode;
1629
1630         /* Update the directory mtime and ctime */
1631         retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1632         if (retval == 0) {
1633                 inode.i_mtime = inode.i_ctime = time(0);
1634                 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1635                 if (is->err)
1636                         return DIRENT_ABORT;
1637         }
1638
1639         return DIRENT_CHANGED;
1640 }
1641
1642 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1643 {
1644         errcode_t               retval;
1645         struct istruct          is;
1646
1647         if (!rfs->imap)
1648                 return 0;
1649
1650         /*
1651          * Now, we iterate over all of the directories to update the
1652          * inode references
1653          */
1654         is.num = 0;
1655         is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
1656         is.rfs = rfs;
1657         is.err = 0;
1658
1659         if (rfs->progress) {
1660                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1661                                          0, is.max_dirs);
1662                 if (retval)
1663                         goto errout;
1664         }
1665
1666         retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1667                                            DIRENT_FLAG_INCLUDE_EMPTY, 0,
1668                                            check_and_change_inodes, &is);
1669         if (retval)
1670                 goto errout;
1671         if (is.err) {
1672                 retval = is.err;
1673                 goto errout;
1674         }
1675
1676         if (rfs->progress && (is.num < is.max_dirs))
1677                 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1678                                 is.max_dirs, is.max_dirs);
1679
1680 errout:
1681         ext2fs_free_extent_table(rfs->imap);
1682         rfs->imap = 0;
1683         return retval;
1684 }
1685
1686
1687 /* --------------------------------------------------------------------
1688  *
1689  * Resize processing, phase 5.
1690  *
1691  * In this phase we actually move the inode table around, and then
1692  * update the summary statistics.  This is scary, since aborting here
1693  * will potentially scramble the filesystem.  (We are moving the
1694  * inode tables around in place, and so the potential for lost data,
1695  * or at the very least scrambling the mapping between filenames and
1696  * inode numbers is very high in case of a power failure here.)
1697  * --------------------------------------------------------------------
1698  */
1699
1700
1701 /*
1702  * A very scary routine --- this one moves the inode table around!!!
1703  *
1704  * After this you have to use the rfs->new_fs file handle to read and
1705  * write inodes.
1706  */
1707 static errcode_t move_itables(ext2_resize_t rfs)
1708 {
1709         int             n, num, size;
1710         long long       diff;
1711         dgrp_t          i, max_groups;
1712         ext2_filsys     fs = rfs->new_fs;
1713         char            *cp;
1714         blk64_t         old_blk, new_blk, blk;
1715         errcode_t       retval;
1716         int             j, to_move, moved;
1717
1718         max_groups = fs->group_desc_count;
1719         if (max_groups > rfs->old_fs->group_desc_count)
1720                 max_groups = rfs->old_fs->group_desc_count;
1721
1722         size = fs->blocksize * fs->inode_blocks_per_group;
1723         if (!rfs->itable_buf) {
1724                 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1725                 if (retval)
1726                         return retval;
1727         }
1728
1729         /*
1730          * Figure out how many inode tables we need to move
1731          */
1732         to_move = moved = 0;
1733         for (i=0; i < max_groups; i++)
1734                 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
1735                     ext2fs_inode_table_loc(fs, i))
1736                         to_move++;
1737
1738         if (to_move == 0)
1739                 return 0;
1740
1741         if (rfs->progress) {
1742                 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1743                                        0, to_move);
1744                 if (retval)
1745                         goto errout;
1746         }
1747
1748         rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1749
1750         for (i=0; i < max_groups; i++) {
1751                 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
1752                 new_blk = ext2fs_inode_table_loc(fs, i);
1753                 diff = new_blk - old_blk;
1754
1755 #ifdef RESIZE2FS_DEBUG
1756                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1757                         printf("Itable move group %d block %llu->%llu (diff %lld)\n",
1758                                i, old_blk, new_blk, diff);
1759 #endif
1760
1761                 if (!diff)
1762                         continue;
1763
1764                 retval = io_channel_read_blk64(fs->io, old_blk,
1765                                                fs->inode_blocks_per_group,
1766                                                rfs->itable_buf);
1767                 if (retval)
1768                         goto errout;
1769                 /*
1770                  * The end of the inode table segment often contains
1771                  * all zeros, and we're often only moving the inode
1772                  * table down a block or two.  If so, we can optimize
1773                  * things by not rewriting blocks that we know to be zero
1774                  * already.
1775                  */
1776                 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
1777                         if (*cp)
1778                                 break;
1779                 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1780 #ifdef RESIZE2FS_DEBUG
1781                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1782                         printf("%d blocks of zeros...\n", n);
1783 #endif
1784                 num = fs->inode_blocks_per_group;
1785                 if (n > diff)
1786                         num -= n;
1787
1788                 retval = io_channel_write_blk64(fs->io, new_blk,
1789                                                 num, rfs->itable_buf);
1790                 if (retval) {
1791                         io_channel_write_blk64(fs->io, old_blk,
1792                                                num, rfs->itable_buf);
1793                         goto errout;
1794                 }
1795                 if (n > diff) {
1796                         retval = io_channel_write_blk64(fs->io,
1797                               old_blk + fs->inode_blocks_per_group,
1798                               diff, (rfs->itable_buf +
1799                                      (fs->inode_blocks_per_group - diff) *
1800                                      fs->blocksize));
1801                         if (retval)
1802                                 goto errout;
1803                 }
1804
1805                 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1806                      j < fs->inode_blocks_per_group ; j++, blk++)
1807                         ext2fs_block_alloc_stats2(fs, blk, -1);
1808
1809                 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
1810                 ext2fs_group_desc_csum_set(rfs->old_fs, i);
1811                 ext2fs_mark_super_dirty(rfs->old_fs);
1812                 ext2fs_flush(rfs->old_fs);
1813
1814                 if (rfs->progress) {
1815                         retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1816                                                ++moved, to_move);
1817                         if (retval)
1818                                 goto errout;
1819                 }
1820         }
1821         mark_table_blocks(fs, fs->block_map);
1822         ext2fs_flush(fs);
1823 #ifdef RESIZE2FS_DEBUG
1824         if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1825                 printf("Inode table move finished.\n");
1826 #endif
1827         return 0;
1828
1829 errout:
1830         return retval;
1831 }
1832
1833 /*
1834  * Fix the resize inode
1835  */
1836 static errcode_t fix_resize_inode(ext2_filsys fs)
1837 {
1838         struct ext2_inode       inode;
1839         errcode_t               retval;
1840         char                    *block_buf = NULL;
1841
1842         if (!(fs->super->s_feature_compat &
1843               EXT2_FEATURE_COMPAT_RESIZE_INODE))
1844                 return 0;
1845
1846         retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1847         if (retval) goto errout;
1848
1849         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1850         if (retval) goto errout;
1851
1852         ext2fs_iblk_set(fs, &inode, 1);
1853
1854         retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1855         if (retval) goto errout;
1856
1857         if (!inode.i_block[EXT2_DIND_BLOCK]) {
1858                 /*
1859                  * Avoid zeroing out block #0; that's rude.  This
1860                  * should never happen anyway since the filesystem
1861                  * should be fsck'ed and we assume it is consistent.
1862                  */
1863                 fprintf(stderr,
1864                         _("Should never happen: resize inode corrupt!\n"));
1865                 exit(1);
1866         }
1867
1868         memset(block_buf, 0, fs->blocksize);
1869
1870         retval = io_channel_write_blk64(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1871                                         1, block_buf);
1872         if (retval) goto errout;
1873
1874         retval = ext2fs_create_resize_inode(fs);
1875         if (retval)
1876                 goto errout;
1877
1878 errout:
1879         if (block_buf)
1880                 ext2fs_free_mem(&block_buf);
1881         return retval;
1882 }
1883
1884 /*
1885  * Finally, recalculate the summary information
1886  */
1887 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1888 {
1889         blk64_t         blk;
1890         ext2_ino_t      ino;
1891         unsigned int    group = 0;
1892         unsigned int    count = 0;
1893         blk64_t         total_blocks_free = 0;
1894         int             total_inodes_free = 0;
1895         int             group_free = 0;
1896         int             uninit = 0;
1897         blk64_t         super_blk, old_desc_blk, new_desc_blk;
1898         int             old_desc_blocks;
1899
1900         /*
1901          * First calculate the block statistics
1902          */
1903         uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
1904         ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
1905                                   &new_desc_blk, 0);
1906         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
1907                 old_desc_blocks = fs->super->s_first_meta_bg;
1908         else
1909                 old_desc_blocks = fs->desc_blocks +
1910                         fs->super->s_reserved_gdt_blocks;
1911         for (blk = B2C(fs->super->s_first_data_block);
1912              blk < ext2fs_blocks_count(fs->super);
1913              blk += EXT2FS_CLUSTER_RATIO(fs)) {
1914                 if ((uninit &&
1915                      !(EQ_CLSTR(blk, super_blk) ||
1916                        ((old_desc_blk && old_desc_blocks &&
1917                          GE_CLSTR(blk, old_desc_blk) &&
1918                          LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
1919                        ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
1920                        EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
1921                        EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
1922                        ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
1923                          LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
1924                                   + fs->inode_blocks_per_group))))) ||
1925                     (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
1926                         group_free++;
1927                         total_blocks_free++;
1928                 }
1929                 count++;
1930                 if ((count == fs->super->s_clusters_per_group) ||
1931                     EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
1932                         ext2fs_bg_free_blocks_count_set(fs, group, group_free);
1933                         ext2fs_group_desc_csum_set(fs, group);
1934                         group++;
1935                         if (group >= fs->group_desc_count)
1936                                 break;
1937                         count = 0;
1938                         group_free = 0;
1939                         uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
1940                         ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
1941                                                   &old_desc_blk,
1942                                                   &new_desc_blk, 0);
1943                         if (fs->super->s_feature_incompat &
1944                             EXT2_FEATURE_INCOMPAT_META_BG)
1945                                 old_desc_blocks = fs->super->s_first_meta_bg;
1946                         else
1947                                 old_desc_blocks = fs->desc_blocks +
1948                                         fs->super->s_reserved_gdt_blocks;
1949                 }
1950         }
1951         total_blocks_free = C2B(total_blocks_free);
1952         ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
1953
1954         /*
1955          * Next, calculate the inode statistics
1956          */
1957         group_free = 0;
1958         count = 0;
1959         group = 0;
1960
1961         /* Protect loop from wrap-around if s_inodes_count maxed */
1962         uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
1963         for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
1964                 if (uninit ||
1965                     !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
1966                         group_free++;
1967                         total_inodes_free++;
1968                 }
1969                 count++;
1970                 if ((count == fs->super->s_inodes_per_group) ||
1971                     (ino == fs->super->s_inodes_count)) {
1972                         ext2fs_bg_free_inodes_count_set(fs, group, group_free);
1973                         ext2fs_group_desc_csum_set(fs, group);
1974                         group++;
1975                         if (group >= fs->group_desc_count)
1976                                 break;
1977                         count = 0;
1978                         group_free = 0;
1979                         uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
1980                 }
1981         }
1982         fs->super->s_free_inodes_count = total_inodes_free;
1983         ext2fs_mark_super_dirty(fs);
1984         return 0;
1985 }
1986
1987 /*
1988  *  Journal may have been relocated; update the backup journal blocks
1989  *  in the superblock.
1990  */
1991 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
1992 {
1993         errcode_t         retval;
1994         struct ext2_inode inode;
1995
1996         if (!(fs->super->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1997                 return 0;
1998
1999         /* External journal? Nothing to do. */
2000         if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2001                 return 0;
2002
2003         retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2004         if (retval)
2005                 return retval;
2006         memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2007         fs->super->s_jnl_blocks[15] = inode.i_size_high;
2008         fs->super->s_jnl_blocks[16] = inode.i_size;
2009         fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2010         ext2fs_mark_super_dirty(fs);
2011         return 0;
2012 }
2013
2014 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2015                                int old_desc_blocks)
2016 {
2017         blk64_t super_blk, old_desc_blk, new_desc_blk;
2018         int overhead;
2019
2020         /* inode table blocks plus allocation bitmaps */
2021         overhead = fs->inode_blocks_per_group + 2;
2022
2023         ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2024                                   &old_desc_blk, &new_desc_blk, 0);
2025         if ((grp == 0) || super_blk)
2026                 overhead++;
2027         if (old_desc_blk)
2028                 overhead += old_desc_blocks;
2029         else if (new_desc_blk)
2030                 overhead++;
2031         return overhead;
2032 }
2033
2034
2035 /*
2036  * calcluate the minimum number of blocks the given fs can be resized to
2037  */
2038 blk64_t calculate_minimum_resize_size(ext2_filsys fs)
2039 {
2040         ext2_ino_t inode_count;
2041         blk64_t blks_needed, groups, data_blocks;
2042         blk64_t grp, data_needed, last_start;
2043         blk64_t overhead = 0;
2044         int old_desc_blocks;
2045         int extra_groups = 0;
2046         int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2047
2048         /*
2049          * first figure out how many group descriptors we need to
2050          * handle the number of inodes we have
2051          */
2052         inode_count = fs->super->s_inodes_count -
2053                 fs->super->s_free_inodes_count;
2054         blks_needed = ext2fs_div_ceil(inode_count,
2055                                       fs->super->s_inodes_per_group) *
2056                 EXT2_BLOCKS_PER_GROUP(fs->super);
2057         groups = ext2fs_div64_ceil(blks_needed,
2058                                    EXT2_BLOCKS_PER_GROUP(fs->super));
2059
2060         /*
2061          * number of old-style block group descriptor blocks
2062          */
2063         if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
2064                 old_desc_blocks = fs->super->s_first_meta_bg;
2065         else
2066                 old_desc_blocks = fs->desc_blocks +
2067                         fs->super->s_reserved_gdt_blocks;
2068
2069         /* calculate how many blocks are needed for data */
2070         data_needed = ext2fs_blocks_count(fs->super) -
2071                 ext2fs_free_blocks_count(fs->super);
2072
2073         for (grp = 0; grp < fs->group_desc_count; grp++)
2074                 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
2075
2076         /*
2077          * For ext4 we need to allow for up to a flex_bg worth of
2078          * inode tables of slack space so the resize operation can be
2079          * guaranteed to finish.
2080          */
2081         if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
2082                 extra_groups = flexbg_size - (groups & (flexbg_size - 1));
2083                 data_needed += fs->inode_blocks_per_group * extra_groups;
2084                 extra_groups = groups % flexbg_size;
2085         }
2086
2087         /*
2088          * figure out how many data blocks we have given the number of groups
2089          * we need for our inodes
2090          */
2091         data_blocks = groups * EXT2_BLOCKS_PER_GROUP(fs->super);
2092         last_start = 0;
2093         for (grp = 0; grp < groups; grp++) {
2094                 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
2095
2096                 /*
2097                  * we want to keep track of how much data we can store in
2098                  * the groups leading up to the last group so we can determine
2099                  * how big the last group needs to be
2100                  */
2101                 if (grp != (groups - 1))
2102                         last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
2103                                 overhead;
2104
2105                 data_blocks -= overhead;
2106         }
2107
2108         /*
2109          * if we need more group descriptors in order to accomodate our data
2110          * then we need to add them here
2111          */
2112         while (data_needed > data_blocks) {
2113                 blk64_t remainder = data_needed - data_blocks;
2114                 blk64_t extra_grps;
2115
2116                 /* figure out how many more groups we need for the data */
2117                 extra_grps = ext2fs_div64_ceil(remainder,
2118                                                EXT2_BLOCKS_PER_GROUP(fs->super));
2119
2120                 data_blocks += extra_grps * EXT2_BLOCKS_PER_GROUP(fs->super);
2121
2122                 /* ok we have to account for the last group */
2123                 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2124                 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
2125
2126                 for (grp = groups; grp < groups+extra_grps; grp++) {
2127                         overhead = calc_group_overhead(fs, grp,
2128                                                        old_desc_blocks);
2129
2130                         /*
2131                          * again, we need to see how much data we cram into
2132                          * all of the groups leading up to the last group
2133                          */
2134                         if (grp != (groups + extra_grps - 1))
2135                                 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
2136                                         - overhead;
2137
2138                         data_blocks -= overhead;
2139                 }
2140
2141                 groups += extra_grps;
2142                 extra_groups += extra_grps;
2143                 if (fs->super->s_feature_incompat
2144                         & EXT4_FEATURE_INCOMPAT_FLEX_BG
2145                     && extra_groups > flexbg_size) {
2146                         /*
2147                          * For ext4 we need to allow for up to a flex_bg worth
2148                          * of inode tables of slack space so the resize
2149                          * operation can be guaranteed to finish.
2150                          */
2151                         extra_groups = flexbg_size -
2152                                                 (groups & (flexbg_size - 1));
2153                         data_needed += (fs->inode_blocks_per_group *
2154                                         extra_groups);
2155                         extra_groups = groups % flexbg_size;
2156                 }
2157         }
2158
2159         /* now for the fun voodoo */
2160         overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2161
2162         /*
2163          * if this is the case then the last group is going to have data in it
2164          * so we need to adjust the size of the last group accordingly
2165          */
2166         if (last_start < data_needed) {
2167                 blk64_t remainder = data_needed - last_start;
2168
2169                 /*
2170                  * 50 is a magic number that mkfs/resize uses to see if its
2171                  * even worth making/resizing the fs.  basically you need to
2172                  * have at least 50 blocks in addition to the blocks needed
2173                  * for the metadata in the last group
2174                  */
2175                 if (remainder > 50)
2176                         overhead += remainder;
2177                 else
2178                         overhead += 50;
2179         } else
2180                 overhead += 50;
2181
2182         overhead += fs->super->s_first_data_block;
2183
2184         /*
2185          * since our last group doesn't have to be BLOCKS_PER_GROUP large, we
2186          * only do groups-1, and then add the number of blocks needed to
2187          * handle the group descriptor metadata+data that we need
2188          */
2189         blks_needed = (groups-1) * EXT2_BLOCKS_PER_GROUP(fs->super);
2190         blks_needed += overhead;
2191
2192         /*
2193          * If at this point we've already added up more "needed" than
2194          * the current size, just return current size as minimum.
2195          */
2196         if (blks_needed >= ext2fs_blocks_count(fs->super))
2197                 return ext2fs_blocks_count(fs->super);
2198         /*
2199          * We need to reserve a few extra blocks if extents are
2200          * enabled, in case we need to grow the extent tree.  The more
2201          * we shrink the file system, the more space we need.
2202          */
2203         if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
2204                 blks_needed += (ext2fs_blocks_count(fs->super) -
2205                                 blks_needed)/500;
2206
2207         return blks_needed;
2208 }