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 Theodore 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 resize2fs_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 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs);
  57 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
  58                                                  ext2fs_block_bitmap meta_bmap);
  59 static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size);
  60 static errcode_t move_bg_metadata(ext2_resize_t rfs);
  61 static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs);
  62
  63 /*
  64  * Some helper functions to check if a block is in a metadata area
  65  */
  66 static inline int is_block_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
  67 {
  68         return blk == ext2fs_block_bitmap_loc(fs, grp);
  69 }
  70
  71 static inline int is_inode_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
  72 {
  73         return blk == ext2fs_inode_bitmap_loc(fs, grp);
  74 }
  75
  76 static int is_inode_tb(ext2_filsys fs, unsigned int grp, blk64_t blk)
  77 {
  78         return blk >= ext2fs_inode_table_loc(fs, grp) &&
  79                blk < (ext2fs_inode_table_loc(fs, grp) +
  80                       fs->inode_blocks_per_group);
  81 }
  82
  83 /* Some bigalloc helper macros which are more succinct... */
  84 #define B2C(x)  EXT2FS_B2C(fs, (x))
  85 #define C2B(x)  EXT2FS_C2B(fs, (x))
  86 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
  87 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
  88 #define LT_CLSTR(x, y) (B2C(x) <  B2C(y))
  89 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
  90 #define GT_CLSTR(x, y) (B2C(x) >  B2C(y))
  91
  92 static int lazy_itable_init;
  93
  94 /*
  95  * This is the top-level routine which does the dirty deed....
  96  */
  97 errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
  98             errcode_t (*progress)(ext2_resize_t rfs, int pass,
  99                                           unsigned long cur,
 100                                           unsigned long max_val))
 101 {
 102         ext2_resize_t   rfs;
 103         errcode_t       retval;
 104         struct resource_track   rtrack, overall_track;
 105
 106         /*
 107          * Create the data structure
 108          */
 109         retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
 110         if (retval)
 111                 return retval;
 112
 113         memset(rfs, 0, sizeof(struct ext2_resize_struct));
 114         fs->priv_data = rfs;
 115         rfs->old_fs = fs;
 116         rfs->flags = flags;
 117         rfs->itable_buf  = 0;
 118         rfs->progress = progress;
 119
 120         init_resource_track(&overall_track, "overall resize2fs", fs->io);
 121         init_resource_track(&rtrack, "read_bitmaps", fs->io);
 122         retval = ext2fs_read_bitmaps(fs);
 123         if (retval)
 124                 goto errout;
 125         print_resource_track(rfs, &rtrack, fs->io);
 126
 127         fs->super->s_state |= EXT2_ERROR_FS;
 128         ext2fs_mark_super_dirty(fs);
 129         ext2fs_flush(fs);
 130
 131         init_resource_track(&rtrack, "fix_uninit_block_bitmaps 1", fs->io);
 132         fix_uninit_block_bitmaps(fs);
 133         print_resource_track(rfs, &rtrack, fs->io);
 134         retval = ext2fs_dup_handle(fs, &rfs->new_fs);
 135         if (retval)
 136                 goto errout;
 137
 138         init_resource_track(&rtrack, "resize_group_descriptors", fs->io);
 139         retval = resize_group_descriptors(rfs, *new_size);
 140         if (retval)
 141                 goto errout;
 142         print_resource_track(rfs, &rtrack, fs->io);
 143
 144         init_resource_track(&rtrack, "move_bg_metadata", fs->io);
 145         retval = move_bg_metadata(rfs);
 146         if (retval)
 147                 goto errout;
 148         print_resource_track(rfs, &rtrack, fs->io);
 149
 150         init_resource_track(&rtrack, "zero_high_bits_in_metadata", fs->io);
 151         retval = zero_high_bits_in_inodes(rfs);
 152         if (retval)
 153                 goto errout;
 154         print_resource_track(rfs, &rtrack, fs->io);
 155
 156         init_resource_track(&rtrack, "adjust_superblock", fs->io);
 157         retval = adjust_superblock(rfs, *new_size);
 158         if (retval)
 159                 goto errout;
 160         print_resource_track(rfs, &rtrack, fs->io);
 161
 162         init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
 163         fix_uninit_block_bitmaps(rfs->new_fs);
 164         print_resource_track(rfs, &rtrack, fs->io);
 165         /* Clear the block bitmap uninit flag for the last block group */
 166         ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
 167                              EXT2_BG_BLOCK_UNINIT);
 168
 169         *new_size = ext2fs_blocks_count(rfs->new_fs->super);
 170
 171         init_resource_track(&rtrack, "blocks_to_move", fs->io);
 172         retval = blocks_to_move(rfs);
 173         if (retval)
 174                 goto errout;
 175         print_resource_track(rfs, &rtrack, fs->io);
 176
 177 #ifdef RESIZE2FS_DEBUG
 178         if (rfs->flags & RESIZE_DEBUG_BMOVE)
 179                 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
 180                        (unsigned long long) ext2fs_free_blocks_count(rfs->old_fs->super),
 181                        (unsigned long long) ext2fs_free_blocks_count(rfs->new_fs->super),
 182                        (unsigned long long) rfs->needed_blocks);
 183 #endif
 184
 185         init_resource_track(&rtrack, "block_mover", fs->io);
 186         retval = block_mover(rfs);
 187         if (retval)
 188                 goto errout;
 189         print_resource_track(rfs, &rtrack, fs->io);
 190
 191         init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
 192         retval = inode_scan_and_fix(rfs);
 193         if (retval)
 194                 goto errout;
 195         print_resource_track(rfs, &rtrack, fs->io);
 196
 197         init_resource_track(&rtrack, "inode_ref_fix", fs->io);
 198         retval = inode_ref_fix(rfs);
 199         if (retval)
 200                 goto errout;
 201         print_resource_track(rfs, &rtrack, fs->io);
 202
 203         init_resource_track(&rtrack, "move_itables", fs->io);
 204         retval = move_itables(rfs);
 205         if (retval)
 206                 goto errout;
 207         print_resource_track(rfs, &rtrack, fs->io);
 208
 209         retval = clear_sparse_super2_last_group(rfs);
 210         if (retval)
 211                 goto errout;
 212
 213         init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
 214         retval = resize2fs_calculate_summary_stats(rfs->new_fs);
 215         if (retval)
 216                 goto errout;
 217         print_resource_track(rfs, &rtrack, fs->io);
 218
 219         init_resource_track(&rtrack, "fix_resize_inode", fs->io);
 220         retval = fix_resize_inode(rfs->new_fs);
 221         if (retval)
 222                 goto errout;
 223         print_resource_track(rfs, &rtrack, fs->io);
 224
 225         init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
 226         retval = fix_sb_journal_backup(rfs->new_fs);
 227         if (retval)
 228                 goto errout;
 229         print_resource_track(rfs, &rtrack, fs->io);
 230
 231         retval = ext2fs_set_gdt_csum(rfs->new_fs);
 232         if (retval)
 233                 goto errout;
 234
 235         rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
 236         rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
 237
 238         print_resource_track(rfs, &overall_track, fs->io);
 239         retval = ext2fs_close_free(&rfs->new_fs);
 240         if (retval)
 241                 goto errout;
 242
 243         rfs->flags = flags;
 244
 245         ext2fs_free(rfs->old_fs);
 246         rfs->old_fs = NULL;
 247         if (rfs->itable_buf)
 248                 ext2fs_free_mem(&rfs->itable_buf);
 249         if (rfs->reserve_blocks)
 250                 ext2fs_free_block_bitmap(rfs->reserve_blocks);
 251         if (rfs->move_blocks)
 252                 ext2fs_free_block_bitmap(rfs->move_blocks);
 253         ext2fs_free_mem(&rfs);
 254
 255         return 0;
 256
 257 errout:
 258         if (rfs->new_fs) {
 259                 ext2fs_free(rfs->new_fs);
 260                 rfs->new_fs = NULL;
 261         }
 262         if (rfs->itable_buf)
 263                 ext2fs_free_mem(&rfs->itable_buf);
 264         ext2fs_free_mem(&rfs);
 265         return retval;
 266 }
 267
 268 /* Keep the size of the group descriptor region constant */
 269 static void adjust_reserved_gdt_blocks(ext2_filsys old_fs, ext2_filsys fs)
 270 {
 271         if (ext2fs_has_feature_resize_inode(fs->super) &&
 272             (old_fs->desc_blocks != fs->desc_blocks)) {
 273                 int new;
 274
 275                 new = ((int) fs->super->s_reserved_gdt_blocks) +
 276                         (old_fs->desc_blocks - fs->desc_blocks);
 277                 if (new < 0)
 278                         new = 0;
 279                 if (new > (int) fs->blocksize/4)
 280                         new = fs->blocksize/4;
 281                 fs->super->s_reserved_gdt_blocks = new;
 282         }
 283 }
 284
 285 /* Toggle 64bit mode */
 286 static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size)
 287 {
 288         void *o, *n, *new_group_desc;
 289         dgrp_t i;
 290         int copy_size;
 291         errcode_t retval;
 292
 293         if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
 294                 return 0;
 295
 296         if (new_size != ext2fs_blocks_count(rfs->new_fs->super) ||
 297             ext2fs_blocks_count(rfs->new_fs->super) >= (1ULL << 32) ||
 298             (rfs->flags & RESIZE_DISABLE_64BIT &&
 299              rfs->flags & RESIZE_ENABLE_64BIT))
 300                 return EXT2_ET_INVALID_ARGUMENT;
 301
 302         if (rfs->flags & RESIZE_DISABLE_64BIT) {
 303                 ext2fs_clear_feature_64bit(rfs->new_fs->super);
 304                 rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE;
 305         } else if (rfs->flags & RESIZE_ENABLE_64BIT) {
 306                 ext2fs_set_feature_64bit(rfs->new_fs->super);
 307                 rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
 308         }
 309
 310         if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
 311             EXT2_DESC_SIZE(rfs->new_fs->super))
 312                 return 0;
 313
 314         o = rfs->new_fs->group_desc;
 315         rfs->new_fs->desc_blocks = ext2fs_div_ceil(
 316                         rfs->old_fs->group_desc_count,
 317                         EXT2_DESC_PER_BLOCK(rfs->new_fs->super));
 318         retval = ext2fs_get_arrayzero(rfs->new_fs->desc_blocks,
 319                                       rfs->old_fs->blocksize, &new_group_desc);
 320         if (retval)
 321                 return retval;
 322
 323         n = new_group_desc;
 324
 325         if (EXT2_DESC_SIZE(rfs->old_fs->super) <=
 326             EXT2_DESC_SIZE(rfs->new_fs->super))
 327                 copy_size = EXT2_DESC_SIZE(rfs->old_fs->super);
 328         else
 329                 copy_size = EXT2_DESC_SIZE(rfs->new_fs->super);
 330         for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
 331                 memcpy(n, o, copy_size);
 332                 n = (char *)n + EXT2_DESC_SIZE(rfs->new_fs->super);
 333                 o = (char *)o + EXT2_DESC_SIZE(rfs->old_fs->super);
 334         }
 335
 336         ext2fs_free_mem(&rfs->new_fs->group_desc);
 337         rfs->new_fs->group_desc = new_group_desc;
 338
 339         for (i = 0; i < rfs->old_fs->group_desc_count; i++)
 340                 ext2fs_group_desc_csum_set(rfs->new_fs, i);
 341
 342         adjust_reserved_gdt_blocks(rfs->old_fs, rfs->new_fs);
 343
 344         return 0;
 345 }
 346
 347 /* Move bitmaps/inode tables out of the way. */
 348 static errcode_t move_bg_metadata(ext2_resize_t rfs)
 349 {
 350         dgrp_t i;
 351         blk64_t b, c, d, old_desc_blocks, new_desc_blocks, j;
 352         ext2fs_block_bitmap old_map, new_map;
 353         int old, new;
 354         errcode_t retval;
 355         int cluster_ratio;
 356
 357         if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
 358                 return 0;
 359
 360         retval = ext2fs_allocate_block_bitmap(rfs->old_fs, "oldfs", &old_map);
 361         if (retval)
 362                 return retval;
 363
 364         retval = ext2fs_allocate_block_bitmap(rfs->new_fs, "newfs", &new_map);
 365         if (retval)
 366                 goto out;
 367
 368         if (ext2fs_has_feature_meta_bg(rfs->old_fs->super)) {
 369                 old_desc_blocks = rfs->old_fs->super->s_first_meta_bg;
 370                 new_desc_blocks = rfs->new_fs->super->s_first_meta_bg;
 371         } else {
 372                 old_desc_blocks = rfs->old_fs->desc_blocks +
 373                                 rfs->old_fs->super->s_reserved_gdt_blocks;
 374                 new_desc_blocks = rfs->new_fs->desc_blocks +
 375                                 rfs->new_fs->super->s_reserved_gdt_blocks;
 376         }
 377
 378         /* Construct bitmaps of super/descriptor blocks in old and new fs */
 379         for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
 380                 retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, i, &b, &c, &d,
 381                                                    NULL);
 382                 if (retval)
 383                         goto out;
 384                 if (b)
 385                         ext2fs_mark_block_bitmap2(old_map, b);
 386                 for (j = 0; c != 0 && j < old_desc_blocks; j++)
 387                         ext2fs_mark_block_bitmap2(old_map, c + j);
 388                 if (d)
 389                         ext2fs_mark_block_bitmap2(old_map, d);
 390
 391                 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, i, &b, &c, &d,
 392                                                    NULL);
 393                 if (retval)
 394                         goto out;
 395                 if (b)
 396                         ext2fs_mark_block_bitmap2(new_map, b);
 397                 for (j = 0; c != 0 && j < new_desc_blocks; j++)
 398                         ext2fs_mark_block_bitmap2(new_map, c + j);
 399                 if (d)
 400                         ext2fs_mark_block_bitmap2(new_map, d);
 401         }
 402
 403         cluster_ratio = EXT2FS_CLUSTER_RATIO(rfs->new_fs);
 404
 405         /* Find changes in block allocations for bg metadata */
 406         for (b = EXT2FS_B2C(rfs->old_fs,
 407                             rfs->old_fs->super->s_first_data_block);
 408              b < ext2fs_blocks_count(rfs->new_fs->super);
 409              b += cluster_ratio) {
 410                 old = ext2fs_test_block_bitmap2(old_map, b);
 411                 new = ext2fs_test_block_bitmap2(new_map, b);
 412
 413                 if (old && !new) {
 414                         /* mark old_map, unmark new_map */
 415                         if (cluster_ratio == 1)
 416                                 ext2fs_unmark_block_bitmap2(
 417                                                 rfs->new_fs->block_map, b);
 418                 } else if (!old && new)
 419                         ; /* unmark old_map, mark new_map */
 420                 else {
 421                         ext2fs_unmark_block_bitmap2(old_map, b);
 422                         ext2fs_unmark_block_bitmap2(new_map, b);
 423                 }
 424         }
 425
 426         /*
 427          * new_map now shows blocks that have been newly allocated.
 428          * old_map now shows blocks that have been newly freed.
 429          */
 430
 431         /*
 432          * Move any conflicting bitmaps and inode tables.  Ensure that we
 433          * don't try to free clusters associated with bitmaps or tables.
 434          */
 435         for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
 436                 b = ext2fs_block_bitmap_loc(rfs->new_fs, i);
 437                 if (ext2fs_test_block_bitmap2(new_map, b))
 438                         ext2fs_block_bitmap_loc_set(rfs->new_fs, i, 0);
 439                 else if (ext2fs_test_block_bitmap2(old_map, b))
 440                         ext2fs_unmark_block_bitmap2(old_map, b);
 441
 442                 b = ext2fs_inode_bitmap_loc(rfs->new_fs, i);
 443                 if (ext2fs_test_block_bitmap2(new_map, b))
 444                         ext2fs_inode_bitmap_loc_set(rfs->new_fs, i, 0);
 445                 else if (ext2fs_test_block_bitmap2(old_map, b))
 446                         ext2fs_unmark_block_bitmap2(old_map, b);
 447
 448                 c = ext2fs_inode_table_loc(rfs->new_fs, i);
 449                 for (b = 0;
 450                      b < rfs->new_fs->inode_blocks_per_group;
 451                      b++) {
 452                         if (ext2fs_test_block_bitmap2(new_map, b + c))
 453                                 ext2fs_inode_table_loc_set(rfs->new_fs, i, 0);
 454                         else if (ext2fs_test_block_bitmap2(old_map, b + c))
 455                                 ext2fs_unmark_block_bitmap2(old_map, b + c);
 456                 }
 457         }
 458
 459         /* Free unused clusters */
 460         for (b = 0;
 461              cluster_ratio > 1 && b < ext2fs_blocks_count(rfs->new_fs->super);
 462              b += cluster_ratio)
 463                 if (ext2fs_test_block_bitmap2(old_map, b))
 464                         ext2fs_unmark_block_bitmap2(rfs->new_fs->block_map, b);
 465 out:
 466         if (old_map)
 467                 ext2fs_free_block_bitmap(old_map);
 468         if (new_map)
 469                 ext2fs_free_block_bitmap(new_map);
 470         return retval;
 471 }
 472
 473 /* Zero out the high bits of extent fields */
 474 static errcode_t zero_high_bits_in_extents(ext2_filsys fs, ext2_ino_t ino,
 475                                  struct ext2_inode *inode)
 476 {
 477         ext2_extent_handle_t    handle;
 478         struct ext2fs_extent    extent;
 479         int                     op = EXT2_EXTENT_ROOT;
 480         errcode_t               errcode;
 481
 482         if (!(inode->i_flags & EXT4_EXTENTS_FL))
 483                 return 0;
 484
 485         errcode = ext2fs_extent_open(fs, ino, &handle);
 486         if (errcode)
 487                 return errcode;
 488
 489         while (1) {
 490                 errcode = ext2fs_extent_get(handle, op, &extent);
 491                 if (errcode)
 492                         break;
 493
 494                 op = EXT2_EXTENT_NEXT_SIB;
 495
 496                 if (extent.e_pblk > (1ULL << 32)) {
 497                         extent.e_pblk &= (1ULL << 32) - 1;
 498                         errcode = ext2fs_extent_replace(handle, 0, &extent);
 499                         if (errcode)
 500                                 break;
 501                 }
 502         }
 503
 504         /* Ok if we run off the end */
 505         if (errcode == EXT2_ET_EXTENT_NO_NEXT)
 506                 errcode = 0;
 507         ext2fs_extent_free(handle);
 508         return errcode;
 509 }
 510
 511 /* Zero out the high bits of inodes. */
 512 static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs)
 513 {
 514         ext2_filsys     fs = rfs->old_fs;
 515         int length = EXT2_INODE_SIZE(fs->super);
 516         struct ext2_inode *inode = NULL;
 517         ext2_inode_scan scan = NULL;
 518         errcode_t       retval;
 519         ext2_ino_t      ino;
 520
 521         if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
 522                 return 0;
 523
 524         if (fs->super->s_creator_os == EXT2_OS_HURD)
 525                 return 0;
 526
 527         retval = ext2fs_open_inode_scan(fs, 0, &scan);
 528         if (retval)
 529                 return retval;
 530
 531         retval = ext2fs_get_mem(length, &inode);
 532         if (retval)
 533                 goto out;
 534
 535         do {
 536                 retval = ext2fs_get_next_inode_full(scan, &ino, inode, length);
 537                 if (retval)
 538                         goto out;
 539                 if (!ino)
 540                         break;
 541                 if (!ext2fs_test_inode_bitmap2(fs->inode_map, ino))
 542                         continue;
 543
 544                 /*
 545                  * Here's how we deal with high block number fields:
 546                  *
 547                  *  - i_size_high has been been written out with i_size_lo
 548                  *    since the ext2 days, so no conversion is needed.
 549                  *
 550                  *  - i_blocks_hi is guarded by both the huge_file feature and
 551                  *    inode flags and has always been written out with
 552                  *    i_blocks_lo if the feature is set.  The field is only
 553                  *    ever read if both feature and inode flag are set, so
 554                  *    we don't need to zero it now.
 555                  *
 556                  *  - i_file_acl_high can be uninitialized, so zero it if
 557                  *    it isn't already.
 558                  */
 559                 if (inode->osd2.linux2.l_i_file_acl_high) {
 560                         inode->osd2.linux2.l_i_file_acl_high = 0;
 561                         retval = ext2fs_write_inode_full(fs, ino, inode,
 562                                                          length);
 563                         if (retval)
 564                                 goto out;
 565                 }
 566
 567                 retval = zero_high_bits_in_extents(fs, ino, inode);
 568                 if (retval)
 569                         goto out;
 570         } while (ino);
 571
 572 out:
 573         if (inode)
 574                 ext2fs_free_mem(&inode);
 575         if (scan)
 576                 ext2fs_close_inode_scan(scan);
 577         return retval;
 578 }
 579
 580 /*
 581  * Clean up the bitmaps for uninitialized bitmaps
 582  */
 583 static void fix_uninit_block_bitmaps(ext2_filsys fs)
 584 {
 585         blk64_t         blk, lblk;
 586         dgrp_t          g;
 587         unsigned int    i;
 588
 589         if (!ext2fs_has_group_desc_csum(fs))
 590                 return;
 591
 592         for (g=0; g < fs->group_desc_count; g++) {
 593                 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
 594                         continue;
 595
 596                 blk = ext2fs_group_first_block2(fs, g);
 597                 lblk = ext2fs_group_last_block2(fs, g);
 598                 ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
 599                                                   lblk - blk + 1);
 600
 601                 ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
 602                 ext2fs_mark_block_bitmap2(fs->block_map,
 603                                           ext2fs_block_bitmap_loc(fs, g));
 604                 ext2fs_mark_block_bitmap2(fs->block_map,
 605                                           ext2fs_inode_bitmap_loc(fs, g));
 606                 for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
 607                      i < fs->inode_blocks_per_group;
 608                      i++, blk++)
 609                         ext2fs_mark_block_bitmap2(fs->block_map, blk);
 610         }
 611 }
 612
 613 /* --------------------------------------------------------------------
 614  *
 615  * Resize processing, phase 1.
 616  *
 617  * In this phase we adjust the in-memory superblock information, and
 618  * initialize any new parts of the inode table.  The new parts of the
 619  * inode table are created in virgin disk space, so we can abort here
 620  * without any side effects.
 621  * --------------------------------------------------------------------
 622  */
 623
 624 /*
 625  * If the group descriptor's bitmap and inode table blocks are valid,
 626  * release them in the new filesystem data structure, and mark them as
 627  * reserved so the old inode table blocks don't get overwritten.
 628  */
 629 static errcode_t free_gdp_blocks(ext2_filsys fs,
 630                                  ext2fs_block_bitmap reserve_blocks,
 631                                  ext2_filsys old_fs,
 632                                  dgrp_t group)
 633 {
 634         blk64_t         blk;
 635         unsigned int    j;
 636         dgrp_t          i;
 637         ext2fs_block_bitmap bg_map = NULL;
 638         errcode_t       retval = 0;
 639         dgrp_t          count = old_fs->group_desc_count - fs->group_desc_count;
 640
 641         /* If bigalloc, don't free metadata living in the same cluster */
 642         if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
 643                 retval = ext2fs_allocate_block_bitmap(fs, "bgdata", &bg_map);
 644                 if (retval)
 645                         goto out;
 646
 647                 retval = mark_table_blocks(fs, bg_map);
 648                 if (retval)
 649                         goto out;
 650         }
 651
 652         for (i = group; i < group + count; i++) {
 653                 blk = ext2fs_block_bitmap_loc(old_fs, i);
 654                 if (blk &&
 655                     (blk < ext2fs_blocks_count(fs->super)) &&
 656                     !(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
 657                         ext2fs_block_alloc_stats2(fs, blk, -1);
 658                         ext2fs_mark_block_bitmap2(reserve_blocks, blk);
 659                 }
 660
 661                 blk = ext2fs_inode_bitmap_loc(old_fs, i);
 662                 if (blk &&
 663                     (blk < ext2fs_blocks_count(fs->super)) &&
 664                     !(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
 665                         ext2fs_block_alloc_stats2(fs, blk, -1);
 666                         ext2fs_mark_block_bitmap2(reserve_blocks, blk);
 667                 }
 668
 669                 blk = ext2fs_inode_table_loc(old_fs, i);
 670                 for (j = 0;
 671                      j < fs->inode_blocks_per_group; j++, blk++) {
 672                         if (blk >= ext2fs_blocks_count(fs->super) ||
 673                             (bg_map && ext2fs_test_block_bitmap2(bg_map, blk)))
 674                                 continue;
 675                         ext2fs_block_alloc_stats2(fs, blk, -1);
 676                         ext2fs_mark_block_bitmap2(reserve_blocks, blk);
 677                 }
 678         }
 679
 680 out:
 681         if (bg_map)
 682                 ext2fs_free_block_bitmap(bg_map);
 683         return retval;
 684 }
 685
 686 /*
 687  * This routine is shared by the online and offline resize routines.
 688  * All of the information which is adjusted in memory is done here.
 689  */
 690 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
 691                          ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
 692 {
 693         errcode_t       retval;
 694         blk64_t         overhead = 0;
 695         blk64_t         rem;
 696         blk64_t         blk, group_block;
 697         blk64_t         real_end;
 698         blk64_t         old_numblocks, numblocks, adjblocks;
 699         unsigned long   i, j, old_desc_blocks;
 700         unsigned int    meta_bg, meta_bg_size;
 701         int             has_super, csum_flag, has_bg;
 702         unsigned long long new_inodes;  /* u64 to check for overflow */
 703         double          percent;
 704
 705         ext2fs_blocks_count_set(fs->super, new_size);
 706         fs->super->s_overhead_clusters = 0;
 707
 708 retry:
 709         fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
 710                                        fs->super->s_first_data_block,
 711                                        EXT2_BLOCKS_PER_GROUP(fs->super));
 712         if (fs->group_desc_count == 0)
 713                 return EXT2_ET_TOOSMALL;
 714         fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
 715                                           EXT2_DESC_PER_BLOCK(fs->super));
 716
 717         /*
 718          * Overhead is the number of bookkeeping blocks per group.  It
 719          * includes the superblock backup, the group descriptor
 720          * backups, the inode bitmap, the block bitmap, and the inode
 721          * table.
 722          */
 723         overhead = (int) (2 + fs->inode_blocks_per_group);
 724
 725         has_bg = 0;
 726         if (ext2fs_has_feature_sparse_super2(fs->super)) {
 727                 /*
 728                  * We have to do this manually since
 729                  * super->s_backup_bgs hasn't been set up yet.
 730                  */
 731                 if (fs->group_desc_count == 2)
 732                         has_bg = fs->super->s_backup_bgs[0] != 0;
 733                 else
 734                         has_bg = fs->super->s_backup_bgs[1] != 0;
 735         } else
 736                 has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
 737         if (has_bg)
 738                 overhead += 1 + fs->desc_blocks +
 739                         fs->super->s_reserved_gdt_blocks;
 740
 741         /*
 742          * See if the last group is big enough to support the
 743          * necessary data structures.  If not, we need to get rid of
 744          * it.
 745          */
 746         rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
 747                 fs->super->s_blocks_per_group;
 748         if ((fs->group_desc_count == 1) && rem && (rem < overhead))
 749                 return EXT2_ET_TOOSMALL;
 750         if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
 751                 ext2fs_blocks_count_set(fs->super,
 752                                         ext2fs_blocks_count(fs->super) - rem);
 753                 goto retry;
 754         }
 755         /*
 756          * Adjust the number of inodes
 757          */
 758         new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
 759         if (new_inodes > ~0U) {
 760                 new_inodes = (unsigned long long) fs->super->s_inodes_per_group * (fs->group_desc_count - 1);
 761                 if (new_inodes <= ~0U) {
 762                         unsigned long long new_blocks =
 763                 ((unsigned long long) fs->super->s_blocks_per_group *
 764                  (fs->group_desc_count - 1)) + fs->super->s_first_data_block;
 765
 766                         ext2fs_blocks_count_set(fs->super, new_blocks);
 767                         goto retry;
 768                 }
 769                 fprintf(stderr, _("inodes (%llu) must be less than %u\n"),
 770                         (unsigned long long) new_inodes, ~0U);
 771                 return EXT2_ET_TOO_MANY_INODES;
 772         }
 773         fs->super->s_inodes_count = fs->super->s_inodes_per_group *
 774                 fs->group_desc_count;
 775
 776         /*
 777          * Adjust the number of free blocks
 778          */
 779         blk = ext2fs_blocks_count(old_fs->super);
 780         if (blk > ext2fs_blocks_count(fs->super))
 781                 ext2fs_free_blocks_count_set(fs->super,
 782                         ext2fs_free_blocks_count(fs->super) -
 783                         (blk - ext2fs_blocks_count(fs->super)));
 784         else
 785                 ext2fs_free_blocks_count_set(fs->super,
 786                         ext2fs_free_blocks_count(fs->super) +
 787                         (ext2fs_blocks_count(fs->super) - blk));
 788
 789         /*
 790          * Adjust the number of reserved blocks
 791          */
 792         percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
 793                 ext2fs_blocks_count(old_fs->super);
 794         ext2fs_r_blocks_count_set(fs->super,
 795                                   (percent * ext2fs_blocks_count(fs->super) /
 796                                    100.0));
 797
 798         /*
 799          * Adjust the bitmaps for size
 800          */
 801         retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
 802                                             fs->super->s_inodes_count,
 803                                             fs->inode_map);
 804         if (retval) goto errout;
 805
 806         real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
 807                 fs->super->s_first_data_block;
 808         retval = ext2fs_resize_block_bitmap2(new_size - 1,
 809                                              real_end, fs->block_map);
 810         if (retval) goto errout;
 811
 812         /*
 813          * If we are growing the file system, also grow the size of
 814          * the reserve_blocks bitmap
 815          */
 816         if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
 817                 retval = ext2fs_resize_block_bitmap2(new_size - 1,
 818                                                      real_end, reserve_blocks);
 819                 if (retval) goto errout;
 820         }
 821
 822         /*
 823          * Reallocate the group descriptors as necessary.
 824          */
 825         if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
 826             old_fs->desc_blocks != fs->desc_blocks) {
 827                 retval = ext2fs_resize_mem(old_fs->desc_blocks *
 828                                            fs->blocksize,
 829                                            fs->desc_blocks * fs->blocksize,
 830                                            &fs->group_desc);
 831                 if (retval)
 832                         goto errout;
 833                 if (fs->desc_blocks > old_fs->desc_blocks)
 834                         memset((char *) fs->group_desc +
 835                                (old_fs->desc_blocks * fs->blocksize), 0,
 836                                (fs->desc_blocks - old_fs->desc_blocks) *
 837                                fs->blocksize);
 838         }
 839
 840         /*
 841          * If the resize_inode feature is set, and we are changing the
 842          * number of descriptor blocks, then adjust
 843          * s_reserved_gdt_blocks if possible to avoid needing to move
 844          * the inode table either now or in the future.
 845          *
 846          * Note: If we're converting to 64bit mode, we did this earlier.
 847          */
 848         if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
 849                 adjust_reserved_gdt_blocks(old_fs, fs);
 850
 851         if (ext2fs_has_feature_meta_bg(fs->super) &&
 852             (fs->super->s_first_meta_bg > fs->desc_blocks)) {
 853                 ext2fs_clear_feature_meta_bg(fs->super);
 854                 fs->super->s_first_meta_bg = 0;
 855         }
 856
 857         /*
 858          * Update the location of the backup superblocks if the
 859          * sparse_super2 feature is enabled.
 860          */
 861         if (ext2fs_has_feature_sparse_super2(fs->super)) {
 862                 dgrp_t last_bg = fs->group_desc_count - 1;
 863                 dgrp_t old_last_bg = old_fs->group_desc_count - 1;
 864
 865                 if (last_bg > old_last_bg) {
 866                         if (old_fs->group_desc_count == 1)
 867                                 fs->super->s_backup_bgs[0] = 1;
 868                         if ((old_fs->group_desc_count < 3 &&
 869                              fs->group_desc_count > 2) ||
 870                             fs->super->s_backup_bgs[1])
 871                                 fs->super->s_backup_bgs[1] = last_bg;
 872                 } else if (last_bg < old_last_bg) {
 873                         if (fs->super->s_backup_bgs[0] > last_bg)
 874                                 fs->super->s_backup_bgs[0] = 0;
 875                         if (fs->super->s_backup_bgs[1] > last_bg)
 876                                 fs->super->s_backup_bgs[1] = 0;
 877                         if (last_bg > 1 &&
 878                             old_fs->super->s_backup_bgs[1] == old_last_bg)
 879                                 fs->super->s_backup_bgs[1] = last_bg;
 880                 }
 881         }
 882
 883         /*
 884          * If we are shrinking the number of block groups, we're done
 885          * and can exit now.
 886          */
 887         if (old_fs->group_desc_count > fs->group_desc_count) {
 888                 /*
 889                  * Check the block groups that we are chopping off
 890                  * and free any blocks associated with their metadata
 891                  */
 892                 retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
 893                                          fs->group_desc_count);
 894                 goto errout;
 895         }
 896
 897         /*
 898          * Fix the count of the last (old) block group
 899          */
 900         old_numblocks = (ext2fs_blocks_count(old_fs->super) -
 901                          old_fs->super->s_first_data_block) %
 902                                  old_fs->super->s_blocks_per_group;
 903         if (!old_numblocks)
 904                 old_numblocks = old_fs->super->s_blocks_per_group;
 905         if (old_fs->group_desc_count == fs->group_desc_count) {
 906                 numblocks = (ext2fs_blocks_count(fs->super) -
 907                              fs->super->s_first_data_block) %
 908                         fs->super->s_blocks_per_group;
 909                 if (!numblocks)
 910                         numblocks = fs->super->s_blocks_per_group;
 911         } else
 912                 numblocks = fs->super->s_blocks_per_group;
 913         i = old_fs->group_desc_count - 1;
 914         ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
 915         ext2fs_group_desc_csum_set(fs, i);
 916
 917         /*
 918          * If the number of block groups is staying the same, we're
 919          * done and can exit now.  (If the number block groups is
 920          * shrinking, we had exited earlier.)
 921          */
 922         if (old_fs->group_desc_count >= fs->group_desc_count) {
 923                 retval = 0;
 924                 goto errout;
 925         }
 926
 927         /*
 928          * Initialize the new block group descriptors
 929          */
 930         group_block = ext2fs_group_first_block2(fs,
 931                                                 old_fs->group_desc_count);
 932         csum_flag = ext2fs_has_group_desc_csum(fs);
 933         if (getenv("RESIZE2FS_FORCE_LAZY_ITABLE_INIT") ||
 934             (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
 935              access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0))
 936                 lazy_itable_init = 1;
 937         if (ext2fs_has_feature_meta_bg(fs->super))
 938                 old_desc_blocks = fs->super->s_first_meta_bg;
 939         else
 940                 old_desc_blocks = fs->desc_blocks +
 941                         fs->super->s_reserved_gdt_blocks;
 942
 943         /*
 944          * If we changed the number of block_group descriptor blocks,
 945          * we need to make sure they are all marked as reserved in the
 946          * filesystem's block allocation map.
 947          */
 948         for (i = 0; i < old_fs->group_desc_count; i++)
 949                 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
 950
 951         for (i = old_fs->group_desc_count;
 952              i < fs->group_desc_count; i++) {
 953                 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
 954                        sizeof(struct ext2_group_desc));
 955                 adjblocks = 0;
 956
 957                 ext2fs_bg_flags_zap(fs, i);
 958                 if (csum_flag) {
 959                         ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
 960                         if (!lazy_itable_init)
 961                                 ext2fs_bg_flags_set(fs, i,
 962                                                     EXT2_BG_INODE_ZEROED);
 963                         ext2fs_bg_itable_unused_set(fs, i,
 964                                         fs->super->s_inodes_per_group);
 965                 }
 966
 967                 numblocks = ext2fs_group_blocks_count(fs, i);
 968                 if ((i < fs->group_desc_count - 1) && csum_flag)
 969                         ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
 970
 971                 has_super = ext2fs_bg_has_super(fs, i);
 972                 if (has_super) {
 973                         ext2fs_block_alloc_stats2(fs, group_block, +1);
 974                         adjblocks++;
 975                 }
 976                 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
 977                 meta_bg = i / meta_bg_size;
 978                 if (!ext2fs_has_feature_meta_bg(fs->super) ||
 979                     (meta_bg < fs->super->s_first_meta_bg)) {
 980                         if (has_super) {
 981                                 for (j=0; j < old_desc_blocks; j++)
 982                                         ext2fs_block_alloc_stats2(fs,
 983                                                  group_block + 1 + j, +1);
 984                                 adjblocks += old_desc_blocks;
 985                         }
 986                 } else {
 987                         if (has_super)
 988                                 has_super = 1;
 989                         if (((i % meta_bg_size) == 0) ||
 990                             ((i % meta_bg_size) == 1) ||
 991                             ((i % meta_bg_size) == (meta_bg_size-1)))
 992                                 ext2fs_block_alloc_stats2(fs,
 993                                                  group_block + has_super, +1);
 994                 }
 995
 996                 adjblocks += 2 + fs->inode_blocks_per_group;
 997
 998                 numblocks -= adjblocks;
 999                 ext2fs_free_blocks_count_set(fs->super,
1000                              ext2fs_free_blocks_count(fs->super) - adjblocks);
1001                 fs->super->s_free_inodes_count +=
1002                         fs->super->s_inodes_per_group;
1003                 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
1004                 ext2fs_bg_free_inodes_count_set(fs, i,
1005                                                 fs->super->s_inodes_per_group);
1006                 ext2fs_bg_used_dirs_count_set(fs, i, 0);
1007                 ext2fs_group_desc_csum_set(fs, i);
1008
1009                 retval = ext2fs_allocate_group_table(fs, i, 0);
1010                 if (retval) goto errout;
1011
1012                 group_block += fs->super->s_blocks_per_group;
1013         }
1014         retval = 0;
1015
1016         /*
1017          * Mark all of the metadata blocks as reserved so they won't
1018          * get allocated by the call to ext2fs_allocate_group_table()
1019          * in blocks_to_move(), where we allocate new blocks to
1020          * replace those allocation bitmap and inode table blocks
1021          * which have to get relocated to make space for an increased
1022          * number of the block group descriptors.
1023          */
1024         if (reserve_blocks)
1025                 mark_table_blocks(fs, reserve_blocks);
1026
1027 errout:
1028         return (retval);
1029 }
1030
1031 /*
1032  * Replicate the first part of adjust_fs_info to determine what the
1033  * new size of the file system should be.  This allows resize2fs to
1034  * exit early if we aren't going to make any changes to the file
1035  * system.
1036  */
1037 void adjust_new_size(ext2_filsys fs, blk64_t *sizep)
1038 {
1039         blk64_t         size, rem, overhead = 0;
1040         unsigned long   desc_blocks;
1041         dgrp_t          group_desc_count;
1042         int             has_bg;
1043         unsigned long long new_inodes;  /* u64 to check for overflow */
1044
1045         size = *sizep;
1046 retry:
1047         group_desc_count = ext2fs_div64_ceil(size -
1048                                              fs->super->s_first_data_block,
1049                                              EXT2_BLOCKS_PER_GROUP(fs->super));
1050         if (group_desc_count == 0)
1051                 return;
1052         desc_blocks = ext2fs_div_ceil(group_desc_count,
1053                                       EXT2_DESC_PER_BLOCK(fs->super));
1054
1055         /*
1056          * Overhead is the number of bookkeeping blocks per group.  It
1057          * includes the superblock backup, the group descriptor
1058          * backups, the inode bitmap, the block bitmap, and the inode
1059          * table.
1060          */
1061         overhead = (int) (2 + fs->inode_blocks_per_group);
1062
1063         has_bg = 0;
1064         if (ext2fs_has_feature_sparse_super2(fs->super)) {
1065                 /*
1066                  * We have to do this manually since
1067                  * super->s_backup_bgs hasn't been set up yet.
1068                  */
1069                 if (group_desc_count == 2)
1070                         has_bg = fs->super->s_backup_bgs[0] != 0;
1071                 else
1072                         has_bg = fs->super->s_backup_bgs[1] != 0;
1073         } else
1074                 has_bg = ext2fs_bg_has_super(fs, group_desc_count - 1);
1075         if (has_bg)
1076                 overhead += 1 + desc_blocks +
1077                         fs->super->s_reserved_gdt_blocks;
1078
1079         /*
1080          * See if the last group is big enough to support the
1081          * necessary data structures.  If not, we need to get rid of
1082          * it.
1083          */
1084         rem = (size - fs->super->s_first_data_block) %
1085                 fs->super->s_blocks_per_group;
1086         if ((group_desc_count == 1) && rem && (rem < overhead))
1087                 return;
1088         if ((group_desc_count > 1) && rem && (rem < overhead+50)) {
1089                 size -= rem;
1090                 goto retry;
1091         }
1092
1093         /*
1094          * If we need to reduce the size by no more than a block
1095          * group to avoid overrunning the max inode limit, do it.
1096          */
1097         new_inodes =(unsigned long long) fs->super->s_inodes_per_group * group_desc_count;
1098         if (new_inodes > ~0U) {
1099                 new_inodes = (unsigned long long) fs->super->s_inodes_per_group * (group_desc_count - 1);
1100                 if (new_inodes > ~0U)
1101                         return;
1102                 size = ((unsigned long long) fs->super->s_blocks_per_group *
1103                         (group_desc_count - 1)) + fs->super->s_first_data_block;
1104
1105                 goto retry;
1106         }
1107         *sizep = size;
1108 }
1109
1110 /*
1111  * This routine adjusts the superblock and other data structures, both
1112  * in disk as well as in memory...
1113  */
1114 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
1115 {
1116         ext2_filsys     fs = rfs->new_fs;
1117         int             adj = 0;
1118         errcode_t       retval;
1119         blk64_t         group_block;
1120         unsigned long   i;
1121         unsigned long   max_group;
1122
1123         ext2fs_mark_super_dirty(fs);
1124         ext2fs_mark_bb_dirty(fs);
1125         ext2fs_mark_ib_dirty(fs);
1126
1127         retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
1128                                               &rfs->reserve_blocks);
1129         if (retval)
1130                 return retval;
1131
1132         retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
1133         if (retval)
1134                 goto errout;
1135
1136         /*
1137          * Check to make sure there are enough inodes
1138          */
1139         if ((rfs->old_fs->super->s_inodes_count -
1140              rfs->old_fs->super->s_free_inodes_count) >
1141             rfs->new_fs->super->s_inodes_count) {
1142                 retval = ENOSPC;
1143                 goto errout;
1144         }
1145
1146         /*
1147          * If we are shrinking the number block groups, we're done and
1148          * can exit now.
1149          */
1150         if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
1151                 retval = 0;
1152                 goto errout;
1153         }
1154
1155         /*
1156          * If the number of block groups is staying the same, we're
1157          * done and can exit now.  (If the number block groups is
1158          * shrinking, we had exited earlier.)
1159          */
1160         if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
1161                 retval = 0;
1162                 goto errout;
1163         }
1164
1165         /*
1166          * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1167          * supports lazy inode initialization, we can skip
1168          * initializing the inode table.
1169          */
1170         if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
1171                 retval = 0;
1172                 goto errout;
1173         }
1174
1175         /*
1176          * Initialize the inode table
1177          */
1178         retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
1179                                 &rfs->itable_buf);
1180         if (retval)
1181                 goto errout;
1182
1183         memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
1184         group_block = ext2fs_group_first_block2(fs,
1185                                                 rfs->old_fs->group_desc_count);
1186         adj = rfs->old_fs->group_desc_count;
1187         max_group = fs->group_desc_count - adj;
1188         if (rfs->progress) {
1189                 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1190                                        0, max_group);
1191                 if (retval)
1192                         goto errout;
1193         }
1194         for (i = rfs->old_fs->group_desc_count;
1195              i < fs->group_desc_count; i++) {
1196                 /*
1197                  * Write out the new inode table
1198                  */
1199                 retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
1200                                              fs->inode_blocks_per_group, NULL,
1201                                              NULL);
1202                 if (retval)
1203                         goto errout;
1204
1205                 io_channel_flush(fs->io);
1206                 if (rfs->progress) {
1207                         retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1208                                                i - adj + 1, max_group);
1209                         if (retval)
1210                                 goto errout;
1211                 }
1212                 group_block += fs->super->s_blocks_per_group;
1213         }
1214         io_channel_flush(fs->io);
1215         retval = 0;
1216
1217 errout:
1218         return retval;
1219 }
1220
1221 /* --------------------------------------------------------------------
1222  *
1223  * Resize processing, phase 2.
1224  *
1225  * In this phase we adjust determine which blocks need to be moved, in
1226  * blocks_to_move().  We then copy the blocks to their ultimate new
1227  * destinations using block_mover().  Since we are copying blocks to
1228  * their new locations, again during this pass we can abort without
1229  * any problems.
1230  * --------------------------------------------------------------------
1231  */
1232
1233 /*
1234  * This helper function creates a block bitmap with all of the
1235  * filesystem meta-data blocks.
1236  */
1237 static errcode_t mark_table_blocks(ext2_filsys fs,
1238                                    ext2fs_block_bitmap bmap)
1239 {
1240         dgrp_t                  i;
1241         blk64_t                 blk;
1242
1243         for (i = 0; i < fs->group_desc_count; i++) {
1244                 ext2fs_reserve_super_and_bgd(fs, i, bmap);
1245
1246                 /*
1247                  * Mark the blocks used for the inode table
1248                  */
1249                 blk = ext2fs_inode_table_loc(fs, i);
1250                 if (blk)
1251                         ext2fs_mark_block_bitmap_range2(bmap, blk,
1252                                                 fs->inode_blocks_per_group);
1253
1254                 /*
1255                  * Mark block used for the block bitmap
1256                  */
1257                 blk = ext2fs_block_bitmap_loc(fs, i);
1258                 if (blk)
1259                         ext2fs_mark_block_bitmap2(bmap, blk);
1260
1261                 /*
1262                  * Mark block used for the inode bitmap
1263                  */
1264                 blk = ext2fs_inode_bitmap_loc(fs, i);
1265                 if (blk)
1266                         ext2fs_mark_block_bitmap2(bmap, blk);
1267         }
1268         /* Reserve the MMP block */
1269         if (ext2fs_has_feature_mmp(fs->super) &&
1270             fs->super->s_mmp_block > fs->super->s_first_data_block &&
1271             fs->super->s_mmp_block < ext2fs_blocks_count(fs->super))
1272                 ext2fs_mark_block_bitmap2(bmap, fs->super->s_mmp_block);
1273         return 0;
1274 }
1275
1276 /*
1277  * This function checks to see if a particular block (either a
1278  * superblock or a block group descriptor) overlaps with an inode or
1279  * block bitmap block, or with the inode table.
1280  */
1281 static void mark_fs_metablock(ext2_resize_t rfs,
1282                               ext2fs_block_bitmap meta_bmap,
1283                               int group, blk64_t blk)
1284 {
1285         ext2_filsys fs = rfs->new_fs;
1286
1287         ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1288         ext2fs_block_alloc_stats2(fs, blk, +1);
1289
1290         /*
1291          * Check to see if we overlap with the inode or block bitmap,
1292          * or the inode tables.  If not, and the block is in use, then
1293          * mark it as a block to be moved.
1294          */
1295         if (is_block_bm(fs, group, blk)) {
1296                 ext2fs_block_bitmap_loc_set(fs, group, 0);
1297                 rfs->needed_blocks++;
1298                 return;
1299         }
1300         if (is_inode_bm(fs, group, blk)) {
1301                 ext2fs_inode_bitmap_loc_set(fs, group, 0);
1302                 rfs->needed_blocks++;
1303                 return;
1304         }
1305         if (is_inode_tb(fs, group, blk)) {
1306                 ext2fs_inode_table_loc_set(fs, group, 0);
1307                 rfs->needed_blocks++;
1308                 return;
1309         }
1310         if (ext2fs_has_feature_flex_bg(fs->super)) {
1311                 dgrp_t i;
1312
1313                 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
1314                         if (is_block_bm(fs, i, blk)) {
1315                                 ext2fs_block_bitmap_loc_set(fs, i, 0);
1316                                 rfs->needed_blocks++;
1317                                 return;
1318                         }
1319                         if (is_inode_bm(fs, i, blk)) {
1320                                 ext2fs_inode_bitmap_loc_set(fs, i, 0);
1321                                 rfs->needed_blocks++;
1322                                 return;
1323                         }
1324                         if (is_inode_tb(fs, i, blk)) {
1325                                 ext2fs_inode_table_loc_set(fs, i, 0);
1326                                 rfs->needed_blocks++;
1327                                 return;
1328                         }
1329                 }
1330         }
1331
1332         if (ext2fs_has_group_desc_csum(fs) &&
1333             (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
1334                 /*
1335                  * If the block bitmap is uninitialized, which means
1336                  * nothing other than standard metadata in use.
1337                  */
1338                 return;
1339         } else if (blk < ext2fs_blocks_count(rfs->old_fs->super) &&
1340                    ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
1341                    !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1342                 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1343                 rfs->needed_blocks++;
1344         }
1345 }
1346
1347
1348 /*
1349  * This routine marks and unmarks reserved blocks in the new block
1350  * bitmap.  It also determines which blocks need to be moved and
1351  * places this information into the move_blocks bitmap.
1352  */
1353 static errcode_t blocks_to_move(ext2_resize_t rfs)
1354 {
1355         unsigned int    j;
1356         int             has_super;
1357         dgrp_t          i, max_groups, g;
1358         blk64_t         blk, group_blk;
1359         blk64_t         old_blocks, new_blocks, group_end, cluster_freed;
1360         blk64_t         new_size;
1361         unsigned int    meta_bg, meta_bg_size;
1362         errcode_t       retval;
1363         ext2_filsys     fs, old_fs;
1364         ext2fs_block_bitmap     meta_bmap, new_meta_bmap = NULL;
1365         int             flex_bg;
1366
1367         fs = rfs->new_fs;
1368         old_fs = rfs->old_fs;
1369         if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
1370                 fs = rfs->old_fs;
1371
1372         retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
1373                                               &rfs->move_blocks);
1374         if (retval)
1375                 return retval;
1376
1377         retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
1378                                               &meta_bmap);
1379         if (retval)
1380                 return retval;
1381
1382         retval = mark_table_blocks(old_fs, meta_bmap);
1383         if (retval)
1384                 return retval;
1385
1386         fs = rfs->new_fs;
1387
1388         /*
1389          * If we're shrinking the filesystem, we need to move any
1390          * group's metadata blocks (either allocation bitmaps or the
1391          * inode table) which are beyond the end of the new
1392          * filesystem.
1393          */
1394         new_size = ext2fs_blocks_count(fs->super);
1395         if (new_size < ext2fs_blocks_count(old_fs->super)) {
1396                 for (g = 0; g < fs->group_desc_count; g++) {
1397                         int realloc = 0;
1398                         /*
1399                          * ext2fs_allocate_group_table will re-allocate any
1400                          * metadata blocks whose location is set to zero.
1401                          */
1402                         if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
1403                                 ext2fs_block_bitmap_loc_set(fs, g, 0);
1404                                 realloc = 1;
1405                         }
1406                         if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
1407                                 ext2fs_inode_bitmap_loc_set(fs, g, 0);
1408                                 realloc = 1;
1409                         }
1410                         if ((ext2fs_inode_table_loc(fs, g) +
1411                              fs->inode_blocks_per_group) > new_size) {
1412                                 ext2fs_inode_table_loc_set(fs, g, 0);
1413                                 realloc = 1;
1414                         }
1415
1416                         if (realloc) {
1417                                 retval = ext2fs_allocate_group_table(fs, g, 0);
1418                                 if (retval)
1419                                         return retval;
1420                         }
1421                 }
1422         }
1423
1424         /*
1425          * If we're shrinking the filesystem, we need to move all of
1426          * the blocks that don't fit any more
1427          */
1428         for (blk = ext2fs_blocks_count(fs->super);
1429              blk < ext2fs_blocks_count(old_fs->super); blk++) {
1430                 g = ext2fs_group_of_blk2(fs, blk);
1431                 if (ext2fs_has_group_desc_csum(fs) &&
1432                     ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
1433                         /*
1434                          * The block bitmap is uninitialized, so skip
1435                          * to the next block group.
1436                          */
1437                         blk = ext2fs_group_first_block2(fs, g+1) - 1;
1438                         continue;
1439                 }
1440                 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1441                     !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1442                         ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1443                         rfs->needed_blocks++;
1444                 }
1445                 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1446         }
1447
1448         if (ext2fs_has_feature_meta_bg(old_fs->super))
1449                 old_blocks = old_fs->super->s_first_meta_bg;
1450         else
1451                 old_blocks = old_fs->desc_blocks +
1452                         old_fs->super->s_reserved_gdt_blocks;
1453         if (ext2fs_has_feature_meta_bg(fs->super))
1454                 new_blocks = fs->super->s_first_meta_bg;
1455         else
1456                 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
1457
1458         retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
1459         if (retval)
1460                 goto errout;
1461
1462         if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
1463             EXT2_DESC_SIZE(rfs->new_fs->super) &&
1464             old_blocks == new_blocks) {
1465                 retval = 0;
1466                 goto errout;
1467         }
1468
1469         max_groups = fs->group_desc_count;
1470         if (max_groups > old_fs->group_desc_count)
1471                 max_groups = old_fs->group_desc_count;
1472         group_blk = old_fs->super->s_first_data_block;
1473         /*
1474          * If we're reducing the number of descriptor blocks, this
1475          * makes life easy.  :-)   We just have to mark some extra
1476          * blocks as free.
1477          */
1478         if (old_blocks > new_blocks) {
1479                 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
1480                         retval = ext2fs_allocate_block_bitmap(fs,
1481                                                         _("new meta blocks"),
1482                                                         &new_meta_bmap);
1483                         if (retval)
1484                                 goto errout;
1485
1486                         retval = mark_table_blocks(fs, new_meta_bmap);
1487                         if (retval)
1488                                 goto errout;
1489                 }
1490
1491                 for (i = 0; i < max_groups; i++) {
1492                         if (!ext2fs_bg_has_super(old_fs, i)) {
1493                                 group_blk += fs->super->s_blocks_per_group;
1494                                 continue;
1495                         }
1496                         group_end = group_blk + 1 + old_blocks;
1497                         for (blk = group_blk + 1 + new_blocks;
1498                              blk < group_end;) {
1499                                 if (new_meta_bmap == NULL ||
1500                                     !ext2fs_test_block_bitmap2(new_meta_bmap,
1501                                                                blk)) {
1502                                         cluster_freed =
1503                                                 EXT2FS_CLUSTER_RATIO(fs) -
1504                                                 (blk &
1505                                                  EXT2FS_CLUSTER_MASK(fs));
1506                                         if (cluster_freed > group_end - blk)
1507                                                 cluster_freed = group_end - blk;
1508                                         ext2fs_block_alloc_stats2(fs, blk, -1);
1509                                         blk += EXT2FS_CLUSTER_RATIO(fs);
1510                                         rfs->needed_blocks -= cluster_freed;
1511                                         continue;
1512                                 }
1513                                 rfs->needed_blocks--;
1514                                 blk++;
1515                         }
1516                         group_blk += fs->super->s_blocks_per_group;
1517                 }
1518                 retval = 0;
1519                 goto errout;
1520         }
1521         /*
1522          * If we're increasing the number of descriptor blocks, life
1523          * gets interesting....
1524          */
1525         meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
1526         flex_bg = ext2fs_has_feature_flex_bg(fs->super);
1527         /* first reserve all of the existing fs meta blocks */
1528         for (i = 0; i < max_groups; i++) {
1529                 has_super = ext2fs_bg_has_super(fs, i);
1530                 if (has_super)
1531                         mark_fs_metablock(rfs, meta_bmap, i, group_blk);
1532
1533                 meta_bg = i / meta_bg_size;
1534                 if (!ext2fs_has_feature_meta_bg(fs->super) ||
1535                     (meta_bg < fs->super->s_first_meta_bg)) {
1536                         if (has_super) {
1537                                 for (blk = group_blk+1;
1538                                      blk < group_blk + 1 + new_blocks; blk++)
1539                                         mark_fs_metablock(rfs, meta_bmap,
1540                                                           i, blk);
1541                         }
1542                 } else {
1543                         if (has_super)
1544                                 has_super = 1;
1545                         if (((i % meta_bg_size) == 0) ||
1546                             ((i % meta_bg_size) == 1) ||
1547                             ((i % meta_bg_size) == (meta_bg_size-1)))
1548                                 mark_fs_metablock(rfs, meta_bmap, i,
1549                                                   group_blk + has_super);
1550                 }
1551
1552                 /*
1553                  * Reserve the existing meta blocks that we know
1554                  * aren't to be moved.
1555                  *
1556                  * For flex_bg file systems, in order to avoid
1557                  * overwriting fs metadata (especially inode table
1558                  * blocks) belonging to a different block group when
1559                  * we are relocating the inode tables, we need to
1560                  * reserve all existing fs metadata blocks.
1561                  */
1562                 if (ext2fs_block_bitmap_loc(fs, i))
1563                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1564                                  ext2fs_block_bitmap_loc(fs, i));
1565                 else if (flex_bg && i < old_fs->group_desc_count)
1566                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1567                                  ext2fs_block_bitmap_loc(old_fs, i));
1568
1569                 if (ext2fs_inode_bitmap_loc(fs, i))
1570                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1571                                  ext2fs_inode_bitmap_loc(fs, i));
1572                 else if (flex_bg && i < old_fs->group_desc_count)
1573                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1574                                  ext2fs_inode_bitmap_loc(old_fs, i));
1575
1576                 if (ext2fs_inode_table_loc(fs, i))
1577                         ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1578                                         ext2fs_inode_table_loc(fs, i),
1579                                         fs->inode_blocks_per_group);
1580                 else if (flex_bg && i < old_fs->group_desc_count)
1581                         ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1582                                         ext2fs_inode_table_loc(old_fs, i),
1583                                         old_fs->inode_blocks_per_group);
1584
1585                 group_blk += rfs->new_fs->super->s_blocks_per_group;
1586         }
1587
1588         /* Allocate the missing data structures */
1589         for (i = 0; i < max_groups; i++) {
1590                 if (ext2fs_inode_table_loc(fs, i) &&
1591                     ext2fs_inode_bitmap_loc(fs, i) &&
1592                     ext2fs_block_bitmap_loc(fs, i))
1593                         continue;
1594
1595                 retval = ext2fs_allocate_group_table(fs, i,
1596                                                      rfs->reserve_blocks);
1597                 if (retval)
1598                         goto errout;
1599
1600                 /*
1601                  * For those structures that have changed, we need to
1602                  * do bookkeeping.
1603                  */
1604                 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1605                     (blk = ext2fs_block_bitmap_loc(fs, i))) {
1606                         ext2fs_block_alloc_stats2(fs, blk, +1);
1607                         if (blk < ext2fs_blocks_count(old_fs->super) &&
1608                             ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1609                             !ext2fs_test_block_bitmap2(meta_bmap, blk))
1610                                 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1611                                                          blk);
1612                 }
1613                 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1614                     (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1615                         ext2fs_block_alloc_stats2(fs, blk, +1);
1616                         if (blk < ext2fs_blocks_count(old_fs->super) &&
1617                             ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1618                             !ext2fs_test_block_bitmap2(meta_bmap, blk))
1619                                 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1620                                                          blk);
1621                 }
1622
1623                 /*
1624                  * The inode table, if we need to relocate it, is
1625                  * handled specially.  We have to reserve the blocks
1626                  * for both the old and the new inode table, since we
1627                  * can't have the inode table be destroyed during the
1628                  * block relocation phase.
1629                  */
1630                 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1631                         continue;       /* inode table not moved */
1632
1633                 rfs->needed_blocks += fs->inode_blocks_per_group;
1634
1635                 /*
1636                  * Mark the new inode table as in use in the new block
1637                  * allocation bitmap, and move any blocks that might
1638                  * be necessary.
1639                  */
1640                 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1641                      j < fs->inode_blocks_per_group ; j++, blk++) {
1642                         ext2fs_block_alloc_stats2(fs, blk, +1);
1643                         if (blk < ext2fs_blocks_count(old_fs->super) &&
1644                             ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1645                             !ext2fs_test_block_bitmap2(meta_bmap, blk))
1646                                 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1647                                                          blk);
1648                 }
1649
1650                 /*
1651                  * Make sure the old inode table is reserved in the
1652                  * block reservation bitmap.
1653                  */
1654                 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1655                      j < fs->inode_blocks_per_group ; j++, blk++)
1656                         ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1657         }
1658         retval = 0;
1659
1660 errout:
1661         if (new_meta_bmap)
1662                 ext2fs_free_block_bitmap(new_meta_bmap);
1663         if (meta_bmap)
1664                 ext2fs_free_block_bitmap(meta_bmap);
1665
1666         return retval;
1667 }
1668
1669 /*
1670  * This helper function tries to allocate a new block.  We try to
1671  * avoid hitting the original group descriptor blocks at least at
1672  * first, since we want to make it possible to recover from a badly
1673  * aborted resize operation as much as possible.
1674  *
1675  * In the future, I may further modify this routine to balance out
1676  * where we get the new blocks across the various block groups.
1677  * Ideally we would allocate blocks that corresponded with the block
1678  * group of the containing inode, and keep contiguous blocks
1679  * together.  However, this very difficult to do efficiently, since we
1680  * don't have the necessary information up front.
1681  */
1682
1683 #define AVOID_OLD       1
1684 #define DESPERATION     2
1685
1686 static void init_block_alloc(ext2_resize_t rfs)
1687 {
1688         rfs->alloc_state = AVOID_OLD;
1689         rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1690 #if 0
1691         /* HACK for testing */
1692         if (ext2fs_blocks_count(rfs->new_fs->super) >
1693             ext2fs_blocks_count(rfs->old_fs->super))
1694                 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1695 #endif
1696 }
1697
1698 static blk64_t get_new_block(ext2_resize_t rfs)
1699 {
1700         ext2_filsys     fs = rfs->new_fs;
1701
1702         while (1) {
1703                 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1704                         if (rfs->alloc_state == DESPERATION)
1705                                 return 0;
1706
1707 #ifdef RESIZE2FS_DEBUG
1708                         if (rfs->flags & RESIZE_DEBUG_BMOVE)
1709                                 printf("Going into desperation mode "
1710                                        "for block allocations\n");
1711 #endif
1712                         rfs->alloc_state = DESPERATION;
1713                         rfs->new_blk = fs->super->s_first_data_block;
1714                         continue;
1715                 }
1716                 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1717                     ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1718                                              rfs->new_blk) ||
1719                     ((rfs->alloc_state == AVOID_OLD) &&
1720                      (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1721                      ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1722                                               rfs->new_blk))) {
1723                         rfs->new_blk++;
1724                         continue;
1725                 }
1726                 return rfs->new_blk;
1727         }
1728 }
1729
1730 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
1731                                            blk64_t goal EXT2FS_ATTR((unused)),
1732                                            blk64_t *ret)
1733 {
1734         ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1735         blk64_t blk;
1736         int group;
1737
1738         blk = get_new_block(rfs);
1739         if (!blk)
1740                 return ENOSPC;
1741
1742 #ifdef RESIZE2FS_DEBUG
1743         if (rfs->flags & 0xF)
1744                 printf("get_alloc_block allocating %llu\n",
1745                        (unsigned long long) blk);
1746 #endif
1747
1748         ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1749         ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1750
1751         group = ext2fs_group_of_blk2(rfs->old_fs, blk);
1752         ext2fs_clear_block_uninit(rfs->old_fs, group);
1753         group = ext2fs_group_of_blk2(rfs->new_fs, blk);
1754         ext2fs_clear_block_uninit(rfs->new_fs, group);
1755
1756         *ret = (blk64_t) blk;
1757         return 0;
1758 }
1759
1760 static errcode_t block_mover(ext2_resize_t rfs)
1761 {
1762         blk64_t                 blk, old_blk, new_blk;
1763         ext2_filsys             fs = rfs->new_fs;
1764         ext2_filsys             old_fs = rfs->old_fs;
1765         errcode_t               retval;
1766         __u64                   c, size;
1767         int                     to_move, moved;
1768         ext2_badblocks_list     badblock_list = 0;
1769         int                     bb_modified = 0;
1770
1771         fs->get_alloc_block = resize2fs_get_alloc_block;
1772         old_fs->get_alloc_block = resize2fs_get_alloc_block;
1773
1774         retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1775         if (retval)
1776                 return retval;
1777
1778         new_blk = fs->super->s_first_data_block;
1779         if (!rfs->itable_buf) {
1780                 retval = ext2fs_get_array(fs->blocksize,
1781                                         fs->inode_blocks_per_group,
1782                                         &rfs->itable_buf);
1783                 if (retval)
1784                         return retval;
1785         }
1786         retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1787         if (retval)
1788                 return retval;
1789
1790         /*
1791          * The first step is to figure out where all of the blocks
1792          * will go.
1793          */
1794         to_move = moved = 0;
1795         init_block_alloc(rfs);
1796         for (blk = B2C(old_fs->super->s_first_data_block);
1797              blk < ext2fs_blocks_count(old_fs->super);
1798              blk += EXT2FS_CLUSTER_RATIO(fs)) {
1799                 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1800                         continue;
1801                 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1802                         continue;
1803                 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1804                         ext2fs_badblocks_list_del(badblock_list, blk);
1805                         bb_modified++;
1806                         continue;
1807                 }
1808
1809                 new_blk = get_new_block(rfs);
1810                 if (!new_blk) {
1811                         retval = ENOSPC;
1812                         goto errout;
1813                 }
1814                 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1815                 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1816                 to_move++;
1817         }
1818
1819         if (to_move == 0) {
1820                 if (rfs->bmap) {
1821                         ext2fs_free_extent_table(rfs->bmap);
1822                         rfs->bmap = 0;
1823                 }
1824                 retval = 0;
1825                 goto errout;
1826         }
1827
1828         /*
1829          * Step two is to actually move the blocks
1830          */
1831         retval =  ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1832         if (retval) goto errout;
1833
1834         if (rfs->progress) {
1835                 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1836                                          0, to_move);
1837                 if (retval)
1838                         goto errout;
1839         }
1840         while (1) {
1841                 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1842                 if (retval) goto errout;
1843                 if (!size)
1844                         break;
1845                 old_blk = C2B(old_blk);
1846                 new_blk = C2B(new_blk);
1847                 size = C2B(size);
1848 #ifdef RESIZE2FS_DEBUG
1849                 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1850                         printf("Moving %llu blocks %llu->%llu\n",
1851                                (unsigned long long) size,
1852                                (unsigned long long) old_blk,
1853                                (unsigned long long) new_blk);
1854 #endif
1855                 do {
1856                         c = size;
1857                         if (c > fs->inode_blocks_per_group)
1858                                 c = fs->inode_blocks_per_group;
1859                         retval = io_channel_read_blk64(fs->io, old_blk, c,
1860                                                        rfs->itable_buf);
1861                         if (retval) goto errout;
1862                         retval = io_channel_write_blk64(fs->io, new_blk, c,
1863                                                         rfs->itable_buf);
1864                         if (retval) goto errout;
1865                         size -= c;
1866                         new_blk += c;
1867                         old_blk += c;
1868                         moved += c;
1869                         if (rfs->progress) {
1870                                 io_channel_flush(fs->io);
1871                                 retval = (rfs->progress)(rfs,
1872                                                 E2_RSZ_BLOCK_RELOC_PASS,
1873                                                 moved, to_move);
1874                                 if (retval)
1875                                         goto errout;
1876                         }
1877                 } while (size > 0);
1878                 io_channel_flush(fs->io);
1879         }
1880
1881 errout:
1882         if (badblock_list) {
1883                 if (!retval && bb_modified)
1884                         retval = ext2fs_update_bb_inode(old_fs,
1885                                                         badblock_list);
1886                 ext2fs_badblocks_list_free(badblock_list);
1887         }
1888         return retval;
1889 }
1890
1891
1892 /* --------------------------------------------------------------------
1893  *
1894  * Resize processing, phase 3
1895  *
1896  * --------------------------------------------------------------------
1897  */
1898
1899
1900 /*
1901  * The extent translation table is stored in clusters so we need to
1902  * take special care when mapping a source block number to its
1903  * destination block number.
1904  */
1905 static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1906 {
1907         __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1908
1909         if (new_block != 0)
1910                 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1911         return new_block;
1912 }
1913
1914 struct process_block_struct {
1915         ext2_resize_t           rfs;
1916         ext2_ino_t              ino;
1917         ext2_ino_t              old_ino;
1918         struct ext2_inode *     inode;
1919         errcode_t               error;
1920         int                     is_dir;
1921         int                     changed;
1922         int                     has_extents;
1923 };
1924
1925 static int process_block(ext2_filsys fs, blk64_t        *block_nr,
1926                          e2_blkcnt_t blockcnt,
1927                          blk64_t ref_block EXT2FS_ATTR((unused)),
1928                          int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1929 {
1930         struct process_block_struct *pb;
1931         errcode_t       retval;
1932         blk64_t         block, new_block;
1933         int             ret = 0;
1934
1935         pb = (struct process_block_struct *) priv_data;
1936         block = *block_nr;
1937         if (pb->rfs->bmap) {
1938                 new_block = extent_translate(fs, pb->rfs->bmap, block);
1939                 if (new_block) {
1940                         *block_nr = new_block;
1941                         ret |= BLOCK_CHANGED;
1942                         pb->changed = 1;
1943 #ifdef RESIZE2FS_DEBUG
1944                         if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1945                                 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1946                                        pb->old_ino, (long long) blockcnt,
1947                                        (unsigned long long) block,
1948                                        (unsigned long long) new_block);
1949 #endif
1950                         block = new_block;
1951                 }
1952         }
1953
1954         if (pb->is_dir) {
1955                 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1956                                                block, (int) blockcnt);
1957                 if (retval) {
1958                         pb->error = retval;
1959                         ret |= BLOCK_ABORT;
1960                 }
1961         }
1962         return ret;
1963 }
1964
1965 /*
1966  * Progress callback
1967  */
1968 static errcode_t progress_callback(ext2_filsys fs,
1969                                    ext2_inode_scan scan EXT2FS_ATTR((unused)),
1970                                    dgrp_t group, void * priv_data)
1971 {
1972         ext2_resize_t rfs = (ext2_resize_t) priv_data;
1973         errcode_t               retval;
1974
1975         /*
1976          * This check is to protect against old ext2 libraries.  It
1977          * shouldn't be needed against new libraries.
1978          */
1979         if ((group+1) == 0)
1980                 return 0;
1981
1982         if (rfs->progress) {
1983                 io_channel_flush(fs->io);
1984                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1985                                          group+1, fs->group_desc_count);
1986                 if (retval)
1987                         return retval;
1988         }
1989
1990         return 0;
1991 }
1992
1993 static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
1994                                   struct ext2_inode *inode, int *changed)
1995 {
1996         char *buf = NULL;
1997         blk64_t new_block;
1998         errcode_t err = 0;
1999
2000         /* No EA block or no remapping?  Quit early. */
2001         if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 || !rfs->bmap)
2002                 return 0;
2003         new_block = extent_translate(rfs->old_fs, rfs->bmap,
2004                 ext2fs_file_acl_block(rfs->old_fs, inode));
2005         if (new_block == 0)
2006                 return 0;
2007
2008         /* Set the new ACL block */
2009         ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
2010
2011         /* Update checksum */
2012         if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
2013                 err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
2014                 if (err)
2015                         return err;
2016                 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2017                 err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
2018                 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2019                 if (err)
2020                         goto out;
2021                 err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
2022                 if (err)
2023                         goto out;
2024         }
2025         *changed = 1;
2026
2027 out:
2028         ext2fs_free_mem(&buf);
2029         return err;
2030 }
2031
2032 static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
2033                                errcode_t code EXT2FS_ATTR((unused)),
2034                                const char *fmt EXT2FS_ATTR((unused)),
2035                                va_list args EXT2FS_ATTR((unused)))
2036 {
2037 }
2038
2039 static int fix_ea_entries(ext2_extent imap, struct ext2_ext_attr_entry *entry,
2040                           struct ext2_ext_attr_entry *end, ext2_ino_t last_ino)
2041 {
2042         int modified = 0;
2043         ext2_ino_t new_ino;
2044
2045         while (entry < end && !EXT2_EXT_IS_LAST_ENTRY(entry)) {
2046                 if (entry->e_value_inum > last_ino) {
2047                         new_ino = ext2fs_extent_translate(imap,
2048                                                           entry->e_value_inum);
2049                         entry->e_value_inum = new_ino;
2050                         modified = 1;
2051                 }
2052                 entry = EXT2_EXT_ATTR_NEXT(entry);
2053         }
2054         return modified;
2055 }
2056
2057 static int fix_ea_ibody_entries(ext2_extent imap,
2058                                 struct ext2_inode_large *inode, int inode_size,
2059                                 ext2_ino_t last_ino)
2060 {
2061         struct ext2_ext_attr_entry *start, *end;
2062         __u32 *ea_magic;
2063
2064         if (inode->i_extra_isize == 0)
2065                 return 0;
2066
2067         ea_magic = (__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
2068                                 inode->i_extra_isize);
2069         if (*ea_magic != EXT2_EXT_ATTR_MAGIC)
2070                 return 0;
2071
2072         start = (struct ext2_ext_attr_entry *)(ea_magic + 1);
2073         end = (struct ext2_ext_attr_entry *)((char *)inode + inode_size);
2074
2075         return fix_ea_entries(imap, start, end, last_ino);
2076 }
2077
2078 static int fix_ea_block_entries(ext2_extent imap, char *block_buf,
2079                                 unsigned int blocksize, ext2_ino_t last_ino)
2080 {
2081         struct ext2_ext_attr_header *header;
2082         struct ext2_ext_attr_entry *start, *end;
2083
2084         header = (struct ext2_ext_attr_header *)block_buf;
2085         start = (struct ext2_ext_attr_entry *)(header+1);
2086         end = (struct ext2_ext_attr_entry *)(block_buf + blocksize);
2087
2088         return fix_ea_entries(imap, start, end, last_ino);
2089 }
2090
2091 /* A simple LRU cache to check recently processed blocks. */
2092 struct blk_cache {
2093         int cursor;
2094         blk64_t blks[4];
2095 };
2096
2097 #define BLK_IN_CACHE(b,c) ((b) == (c).blks[0] || (b) == (c).blks[1] || \
2098                            (b) == (c).blks[2] || (b) == (c).blks[3])
2099 #define BLK_ADD_CACHE(b,c) {                    \
2100         (c).blks[(c).cursor] = (b);             \
2101         (c).cursor = ((c).cursor + 1) % 4;      \
2102 }
2103
2104 static errcode_t fix_ea_inode_refs(ext2_resize_t rfs, struct ext2_inode *inode,
2105                                    char *block_buf, ext2_ino_t last_ino)
2106 {
2107         ext2_filsys     fs = rfs->new_fs;
2108         ext2_inode_scan scan = NULL;
2109         ext2_ino_t      ino;
2110         int             inode_size = EXT2_INODE_SIZE(fs->super);
2111         blk64_t         blk;
2112         int             modified;
2113         struct blk_cache blk_cache;
2114         struct ext2_ext_attr_header *header;
2115         errcode_t               retval;
2116
2117         memset(&blk_cache, 0, sizeof(blk_cache));
2118
2119         header = (struct ext2_ext_attr_header *)block_buf;
2120
2121         retval = ext2fs_open_inode_scan(fs, 0, &scan);
2122         if (retval)
2123                 goto out;
2124
2125         while (1) {
2126                 retval = ext2fs_get_next_inode_full(scan, &ino, inode,
2127                                                     inode_size);
2128                 if (retval)
2129                         goto out;
2130                 if (!ino)
2131                         break;
2132
2133                 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2134                         continue; /* inode not in use */
2135
2136                 if (inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
2137                         modified = fix_ea_ibody_entries(rfs->imap,
2138                                         (struct ext2_inode_large *)inode,
2139                                         inode_size, last_ino);
2140                         if (modified) {
2141                                 retval = ext2fs_write_inode_full(fs, ino, inode,
2142                                                                  inode_size);
2143                                 if (retval)
2144                                         goto out;
2145                         }
2146                 }
2147
2148                 blk = ext2fs_file_acl_block(fs, inode);
2149                 if (blk && !BLK_IN_CACHE(blk, blk_cache)) {
2150                         retval = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
2151                         if (retval)
2152                                 goto out;
2153
2154                         modified = fix_ea_block_entries(rfs->imap, block_buf,
2155                                                         fs->blocksize,
2156                                                         last_ino);
2157                         if (modified) {
2158                                 retval = ext2fs_write_ext_attr3(fs, blk,
2159                                                                 block_buf, ino);
2160                                 if (retval)
2161                                         goto out;
2162                                 /*
2163                                  * If refcount is greater than 1, we might see
2164                                  * the same block referenced by other inodes
2165                                  * later.
2166                                  */
2167                                 if (header->h_refcount > 1)
2168                                         BLK_ADD_CACHE(blk, blk_cache);
2169                         }
2170                 }
2171         }
2172         retval = 0;
2173 out:
2174         if (scan)
2175                 ext2fs_close_inode_scan(scan);
2176         return retval;
2177
2178 }
2179 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
2180 {
2181         struct process_block_struct     pb;
2182         ext2_ino_t              ino, new_inode;
2183         struct ext2_inode       *inode = NULL;
2184         ext2_inode_scan         scan = NULL;
2185         errcode_t               retval;
2186         char                    *block_buf = 0;
2187         ext2_ino_t              start_to_move;
2188         int                     inode_size;
2189         int                     update_ea_inode_refs = 0;
2190
2191         if ((rfs->old_fs->group_desc_count <=
2192              rfs->new_fs->group_desc_count) &&
2193             !rfs->bmap)
2194                 return 0;
2195
2196         set_com_err_hook(quiet_com_err_proc);
2197
2198         retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
2199         if (retval) goto errout;
2200
2201         retval = ext2fs_init_dblist(rfs->old_fs, 0);
2202         if (retval) goto errout;
2203         retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
2204         if (retval) goto errout;
2205
2206         start_to_move = (rfs->new_fs->group_desc_count *
2207                          rfs->new_fs->super->s_inodes_per_group);
2208
2209         if (rfs->progress) {
2210                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
2211                                          0, rfs->old_fs->group_desc_count);
2212                 if (retval)
2213                         goto errout;
2214         }
2215         ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
2216         pb.rfs = rfs;
2217         pb.inode = inode;
2218         pb.error = 0;
2219         new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
2220         inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
2221         inode = malloc(inode_size);
2222         if (!inode) {
2223                 retval = ENOMEM;
2224                 goto errout;
2225         }
2226         /*
2227          * First, copy all of the inodes that need to be moved
2228          * elsewhere in the inode table
2229          */
2230         while (1) {
2231                 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
2232                 if (retval) goto errout;
2233                 if (!ino)
2234                         break;
2235
2236                 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2237                         continue; /* inode not in use */
2238
2239                 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
2240                 pb.changed = 0;
2241
2242                 /* Remap EA block */
2243                 retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
2244                 if (retval)
2245                         goto errout;
2246
2247                 new_inode = ino;
2248                 if (ino <= start_to_move)
2249                         goto remap_blocks; /* Don't need to move inode. */
2250
2251                 /*
2252                  * Find a new inode.  Now that extents and directory blocks
2253                  * are tied to the inode number through the checksum, we must
2254                  * set up the new inode before we start rewriting blocks.
2255                  */
2256                 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
2257                 if (retval)
2258                         goto errout;
2259
2260                 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
2261                                           pb.is_dir);
2262                 /*
2263                  * i_ctime field in xattr inodes contain a portion of the ref
2264                  * count, do not overwrite.
2265                  */
2266                 if (inode->i_flags & EXT4_EA_INODE_FL)
2267                         update_ea_inode_refs = 1;
2268                 else
2269                         inode->i_ctime = time(0);
2270
2271                 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
2272                                                 inode, inode_size);
2273                 if (retval)
2274                         goto errout;
2275                 pb.changed = 0;
2276
2277 #ifdef RESIZE2FS_DEBUG
2278                 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
2279                         printf("Inode moved %u->%u\n", ino, new_inode);
2280 #endif
2281                 if (!rfs->imap) {
2282                         retval = ext2fs_create_extent_table(&rfs->imap, 0);
2283                         if (retval)
2284                                 goto errout;
2285                 }
2286                 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
2287
2288 remap_blocks:
2289                 if (pb.changed)
2290                         retval = ext2fs_write_inode_full(rfs->old_fs,
2291                                                          new_inode,
2292                                                          inode, inode_size);
2293                 if (retval)
2294                         goto errout;
2295
2296                 /*
2297                  * Update inodes to point to new blocks; schedule directory
2298                  * blocks for inode remapping.  Need to write out dir blocks
2299                  * with new inode numbers if we have metadata_csum enabled.
2300                  */
2301                 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2302                 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
2303                     (rfs->bmap || pb.is_dir)) {
2304                         pb.ino = new_inode;
2305                         pb.old_ino = ino;
2306                         pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
2307                         retval = ext2fs_block_iterate3(rfs->old_fs,
2308                                                        new_inode, 0, block_buf,
2309                                                        process_block, &pb);
2310                         if (retval)
2311                                 goto errout;
2312                         if (pb.error) {
2313                                 retval = pb.error;
2314                                 goto errout;
2315                         }
2316                 } else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
2317                            (rfs->bmap || pb.is_dir)) {
2318                         /* inline data dir; update it too */
2319                         retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
2320                                                        new_inode, 0, 0);
2321                         if (retval)
2322                                 goto errout;
2323                 }
2324
2325                 /* Fix up extent block checksums with the new inode number */
2326                 if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
2327                     (inode->i_flags & EXT4_EXTENTS_FL)) {
2328                         retval = ext2fs_fix_extents_checksums(rfs->old_fs,
2329                                                               new_inode, NULL);
2330                         if (retval)
2331                                 goto errout;
2332                 }
2333         }
2334
2335         if (update_ea_inode_refs &&
2336             ext2fs_has_feature_ea_inode(rfs->new_fs->super)) {
2337                 retval = fix_ea_inode_refs(rfs, inode, block_buf,
2338                                            start_to_move);
2339                 if (retval)
2340                         goto errout;
2341         }
2342         io_channel_flush(rfs->old_fs->io);
2343
2344 errout:
2345         reset_com_err_hook();
2346         rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2347         if (rfs->bmap) {
2348                 ext2fs_free_extent_table(rfs->bmap);
2349                 rfs->bmap = 0;
2350         }
2351         if (scan)
2352                 ext2fs_close_inode_scan(scan);
2353         if (block_buf)
2354                 ext2fs_free_mem(&block_buf);
2355         free(inode);
2356         return retval;
2357 }
2358
2359 /* --------------------------------------------------------------------
2360  *
2361  * Resize processing, phase 4.
2362  *
2363  * --------------------------------------------------------------------
2364  */
2365
2366 struct istruct {
2367         ext2_resize_t rfs;
2368         errcode_t       err;
2369         unsigned int    max_dirs;
2370         unsigned int    num;
2371 };
2372
2373 static int check_and_change_inodes(ext2_ino_t dir,
2374                                    int entry EXT2FS_ATTR((unused)),
2375                                    struct ext2_dir_entry *dirent, int offset,
2376                                    int  blocksize EXT2FS_ATTR((unused)),
2377                                    char *buf EXT2FS_ATTR((unused)),
2378                                    void *priv_data)
2379 {
2380         struct istruct *is = (struct istruct *) priv_data;
2381         struct ext2_inode       inode;
2382         ext2_ino_t              new_inode;
2383         errcode_t               retval;
2384         int                     ret = 0;
2385
2386         if (is->rfs->progress && offset == 0) {
2387                 io_channel_flush(is->rfs->old_fs->io);
2388                 is->err = (is->rfs->progress)(is->rfs,
2389                                               E2_RSZ_INODE_REF_UPD_PASS,
2390                                               ++is->num, is->max_dirs);
2391                 if (is->err)
2392                         return DIRENT_ABORT;
2393         }
2394
2395         /*
2396          * If we have checksums enabled and the inode wasn't present in the
2397          * old fs, then we must rewrite all dir blocks with new checksums.
2398          */
2399         if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
2400             !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
2401                 ret |= DIRENT_CHANGED;
2402
2403         if (!dirent->inode)
2404                 return ret;
2405
2406         new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
2407
2408         if (!new_inode)
2409                 return ret;
2410 #ifdef RESIZE2FS_DEBUG
2411         if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
2412                 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2413                        dir, ext2fs_dirent_name_len(dirent), dirent->name,
2414                        dirent->inode, new_inode);
2415 #endif
2416
2417         dirent->inode = new_inode;
2418
2419         /* Update the directory mtime and ctime */
2420         retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
2421         if (retval == 0) {
2422                 inode.i_mtime = inode.i_ctime = time(0);
2423                 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
2424                 if (is->err)
2425                         return ret | DIRENT_ABORT;
2426         }
2427
2428         return ret | DIRENT_CHANGED;
2429 }
2430
2431 static errcode_t inode_ref_fix(ext2_resize_t rfs)
2432 {
2433         errcode_t               retval;
2434         struct istruct          is;
2435
2436         if (!rfs->imap)
2437                 return 0;
2438
2439         /*
2440          * Now, we iterate over all of the directories to update the
2441          * inode references
2442          */
2443         is.num = 0;
2444         is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
2445         is.rfs = rfs;
2446         is.err = 0;
2447
2448         if (rfs->progress) {
2449                 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2450                                          0, is.max_dirs);
2451                 if (retval)
2452                         goto errout;
2453         }
2454
2455         rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2456         retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
2457                                            DIRENT_FLAG_INCLUDE_EMPTY, 0,
2458                                            check_and_change_inodes, &is);
2459         rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2460         if (retval)
2461                 goto errout;
2462         if (is.err) {
2463                 retval = is.err;
2464                 goto errout;
2465         }
2466
2467         if (rfs->progress && (is.num < is.max_dirs))
2468                 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2469                                 is.max_dirs, is.max_dirs);
2470
2471 errout:
2472         ext2fs_free_extent_table(rfs->imap);
2473         rfs->imap = 0;
2474         return retval;
2475 }
2476
2477
2478 /* --------------------------------------------------------------------
2479  *
2480  * Resize processing, phase 5.
2481  *
2482  * In this phase we actually move the inode table around, and then
2483  * update the summary statistics.  This is scary, since aborting here
2484  * will potentially scramble the filesystem.  (We are moving the
2485  * inode tables around in place, and so the potential for lost data,
2486  * or at the very least scrambling the mapping between filenames and
2487  * inode numbers is very high in case of a power failure here.)
2488  * --------------------------------------------------------------------
2489  */
2490
2491
2492 /*
2493  * A very scary routine --- this one moves the inode table around!!!
2494  *
2495  * After this you have to use the rfs->new_fs file handle to read and
2496  * write inodes.
2497  */
2498 static errcode_t move_itables(ext2_resize_t rfs)
2499 {
2500         int             n, num, size;
2501         long long       diff;
2502         dgrp_t          i, max_groups;
2503         ext2_filsys     fs = rfs->new_fs;
2504         char            *cp;
2505         blk64_t         old_blk, new_blk, blk, cluster_freed;
2506         errcode_t       retval;
2507         int             to_move, moved;
2508         unsigned int    j;
2509         ext2fs_block_bitmap     new_bmap = NULL;
2510
2511         max_groups = fs->group_desc_count;
2512         if (max_groups > rfs->old_fs->group_desc_count)
2513                 max_groups = rfs->old_fs->group_desc_count;
2514
2515         size = fs->blocksize * fs->inode_blocks_per_group;
2516         if (!rfs->itable_buf) {
2517                 retval = ext2fs_get_mem(size, &rfs->itable_buf);
2518                 if (retval)
2519                         return retval;
2520         }
2521
2522         if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
2523                 retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
2524                                                       &new_bmap);
2525                 if (retval)
2526                         return retval;
2527
2528                 retval = mark_table_blocks(fs, new_bmap);
2529                 if (retval)
2530                         goto errout;
2531         }
2532
2533         /*
2534          * Figure out how many inode tables we need to move
2535          */
2536         to_move = moved = 0;
2537         for (i=0; i < max_groups; i++)
2538                 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
2539                     ext2fs_inode_table_loc(fs, i))
2540                         to_move++;
2541
2542         if (to_move == 0) {
2543                 retval = 0;
2544                 goto errout;
2545         }
2546
2547         if (rfs->progress) {
2548                 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2549                                        0, to_move);
2550                 if (retval)
2551                         goto errout;
2552         }
2553
2554         rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
2555
2556         for (i=0; i < max_groups; i++) {
2557                 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
2558                 new_blk = ext2fs_inode_table_loc(fs, i);
2559                 diff = new_blk - old_blk;
2560
2561 #ifdef RESIZE2FS_DEBUG
2562                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2563                         printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2564                                i, (unsigned long long) old_blk,
2565                                (unsigned long long) new_blk, diff);
2566 #endif
2567
2568                 if (!diff)
2569                         continue;
2570                 if (diff < 0)
2571                         diff = 0;
2572
2573                 retval = io_channel_read_blk64(fs->io, old_blk,
2574                                                fs->inode_blocks_per_group,
2575                                                rfs->itable_buf);
2576                 if (retval)
2577                         goto errout;
2578                 /*
2579                  * The end of the inode table segment often contains
2580                  * all zeros, and we're often only moving the inode
2581                  * table down a block or two.  If so, we can optimize
2582                  * things by not rewriting blocks that we know to be zero
2583                  * already.
2584                  */
2585                 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
2586                         if (*cp)
2587                                 break;
2588                 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
2589 #ifdef RESIZE2FS_DEBUG
2590                 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2591                         printf("%d blocks of zeros...\n", n);
2592 #endif
2593                 num = fs->inode_blocks_per_group;
2594                 if (n > diff)
2595                         num -= n;
2596
2597                 retval = io_channel_write_blk64(fs->io, new_blk,
2598                                                 num, rfs->itable_buf);
2599                 if (retval) {
2600                         io_channel_write_blk64(fs->io, old_blk,
2601                                                num, rfs->itable_buf);
2602                         goto errout;
2603                 }
2604                 if (n > diff) {
2605                         retval = io_channel_write_blk64(fs->io,
2606                               old_blk + fs->inode_blocks_per_group,
2607                               diff, (rfs->itable_buf +
2608                                      (fs->inode_blocks_per_group - diff) *
2609                                      fs->blocksize));
2610                         if (retval)
2611                                 goto errout;
2612                 }
2613
2614                 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
2615                      j < fs->inode_blocks_per_group;) {
2616                         if (new_bmap == NULL ||
2617                             !ext2fs_test_block_bitmap2(new_bmap, blk)) {
2618                                 ext2fs_block_alloc_stats2(fs, blk, -1);
2619                                 cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
2620                                                 (blk & EXT2FS_CLUSTER_MASK(fs));
2621                                 blk += cluster_freed;
2622                                 j += cluster_freed;
2623                                 continue;
2624                         }
2625                         blk++;
2626                         j++;
2627                 }
2628
2629                 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
2630                 ext2fs_group_desc_csum_set(rfs->old_fs, i);
2631                 ext2fs_mark_super_dirty(rfs->old_fs);
2632                 ext2fs_flush(rfs->old_fs);
2633
2634                 if (rfs->progress) {
2635                         retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2636                                                ++moved, to_move);
2637                         if (retval)
2638                                 goto errout;
2639                 }
2640         }
2641         mark_table_blocks(fs, fs->block_map);
2642         ext2fs_flush(fs);
2643 #ifdef RESIZE2FS_DEBUG
2644         if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2645                 printf("Inode table move finished.\n");
2646 #endif
2647         retval = 0;
2648
2649 errout:
2650         if (new_bmap)
2651                 ext2fs_free_block_bitmap(new_bmap);
2652         return retval;
2653 }
2654
2655 /*
2656  * This function is used when expanding a file system.  It frees the
2657  * superblock and block group descriptor blocks from the block group
2658  * which is no longer the last block group.
2659  */
2660 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
2661 {
2662         ext2_filsys     fs = rfs->new_fs;
2663         ext2_filsys     old_fs = rfs->old_fs;
2664         errcode_t       retval;
2665         dgrp_t          old_last_bg = rfs->old_fs->group_desc_count - 1;
2666         dgrp_t          last_bg = fs->group_desc_count - 1;
2667         blk64_t         sb, old_desc;
2668         blk_t           num;
2669
2670         if (!ext2fs_has_feature_sparse_super2(fs->super))
2671                 return 0;
2672
2673         if (last_bg <= old_last_bg)
2674                 return 0;
2675
2676         if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2677             fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2678                 return 0;
2679
2680         if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
2681             old_fs->super->s_backup_bgs[1] != old_last_bg)
2682                 return 0;
2683
2684         if (fs->super->s_backup_bgs[0] == old_last_bg ||
2685             fs->super->s_backup_bgs[1] == old_last_bg)
2686                 return 0;
2687
2688         if (old_last_bg == 0)
2689                 return 0;
2690
2691         retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
2692                                            &sb, &old_desc, NULL, &num);
2693         if (retval)
2694                 return retval;
2695
2696         if (sb)
2697                 ext2fs_unmark_block_bitmap2(fs->block_map, sb);
2698         if (old_desc)
2699                 ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
2700         return 0;
2701 }
2702
2703 /*
2704  * This function is used when shrinking a file system.  We need to
2705  * utilize blocks from what will be the new last block group for the
2706  * backup superblock and block group descriptor blocks.
2707  * Unfortunately, those blocks may be used by other files or fs
2708  * metadata blocks.  We need to mark them as being in use.
2709  */
2710 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
2711                                                  ext2fs_block_bitmap meta_bmap)
2712 {
2713         ext2_filsys     fs = rfs->new_fs;
2714         ext2_filsys     old_fs = rfs->old_fs;
2715         errcode_t       retval;
2716         dgrp_t          old_last_bg = rfs->old_fs->group_desc_count - 1;
2717         dgrp_t          last_bg = fs->group_desc_count - 1;
2718         dgrp_t          g;
2719         blk64_t         blk, sb, old_desc;
2720         blk_t           i, num;
2721         int             realloc = 0;
2722
2723         if (!ext2fs_has_feature_sparse_super2(fs->super))
2724                 return 0;
2725
2726         if (last_bg >= old_last_bg)
2727                 return 0;
2728
2729         if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2730             fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2731                 return 0;
2732
2733         if (fs->super->s_backup_bgs[0] != last_bg &&
2734             fs->super->s_backup_bgs[1] != last_bg)
2735                 return 0;
2736
2737         if (old_fs->super->s_backup_bgs[0] == last_bg ||
2738             old_fs->super->s_backup_bgs[1] == last_bg)
2739                 return 0;
2740
2741         retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
2742                                            &sb, &old_desc, NULL, &num);
2743         if (retval)
2744                 return retval;
2745
2746         if (last_bg && !sb) {
2747                 fputs(_("Should never happen!  No sb in last super_sparse bg?\n"),
2748                       stderr);
2749                 exit(1);
2750         }
2751         if (old_desc && old_desc != sb+1) {
2752                 fputs(_("Should never happen!  Unexpected old_desc in "
2753                         "super_sparse bg?\n"),
2754                       stderr);
2755                 exit(1);
2756         }
2757         num = (old_desc) ? num : 1;
2758
2759         /* Reserve the backup blocks */
2760         ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
2761
2762         for (g = 0; g < fs->group_desc_count; g++) {
2763                 blk64_t mb;
2764
2765                 mb = ext2fs_block_bitmap_loc(fs, g);
2766                 if ((mb >= sb) && (mb < sb + num)) {
2767                         ext2fs_block_bitmap_loc_set(fs, g, 0);
2768                         realloc = 1;
2769                 }
2770                 mb = ext2fs_inode_bitmap_loc(fs, g);
2771                 if ((mb >= sb) && (mb < sb + num)) {
2772                         ext2fs_inode_bitmap_loc_set(fs, g, 0);
2773                         realloc = 1;
2774                 }
2775                 mb = ext2fs_inode_table_loc(fs, g);
2776                 if ((mb < sb + num) &&
2777                     (sb < mb + fs->inode_blocks_per_group)) {
2778                         ext2fs_inode_table_loc_set(fs, g, 0);
2779                         realloc = 1;
2780                 }
2781                 if (realloc) {
2782                         retval = ext2fs_allocate_group_table(fs, g, 0);
2783                         if (retval)
2784                                 return retval;
2785                 }
2786         }
2787
2788         for (blk = sb, i = 0; i < num; blk++, i++) {
2789                 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
2790                     !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
2791                         ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
2792                         rfs->needed_blocks++;
2793                 }
2794                 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
2795         }
2796         return 0;
2797 }
2798
2799 /*
2800  * Fix the resize inode
2801  */
2802 static errcode_t fix_resize_inode(ext2_filsys fs)
2803 {
2804         struct ext2_inode       inode;
2805         errcode_t               retval;
2806
2807         if (!ext2fs_has_feature_resize_inode(fs->super))
2808                 return 0;
2809
2810         retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
2811         if (retval) goto errout;
2812
2813         ext2fs_iblk_set(fs, &inode, 1);
2814
2815         retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
2816         if (retval) goto errout;
2817
2818         if (!inode.i_block[EXT2_DIND_BLOCK]) {
2819                 /*
2820                  * Avoid zeroing out block #0; that's rude.  This
2821                  * should never happen anyway since the filesystem
2822                  * should be fsck'ed and we assume it is consistent.
2823                  */
2824                 fprintf(stderr, "%s",
2825                         _("Should never happen: resize inode corrupt!\n"));
2826                 exit(1);
2827         }
2828
2829         retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
2830                                      NULL, NULL);
2831         if (retval)
2832                 goto errout;
2833
2834         retval = ext2fs_create_resize_inode(fs);
2835         if (retval)
2836                 goto errout;
2837
2838 errout:
2839         return retval;
2840 }
2841
2842 /*
2843  * Finally, recalculate the summary information
2844  */
2845 static errcode_t resize2fs_calculate_summary_stats(ext2_filsys fs)
2846 {
2847         errcode_t       retval;
2848         blk64_t         blk = fs->super->s_first_data_block;
2849         ext2_ino_t      ino;
2850         unsigned int    n, group, count;
2851         blk64_t         total_clusters_free = 0;
2852         int             total_inodes_free = 0;
2853         int             group_free = 0;
2854         int             uninit = 0;
2855         char            *bitmap_buf;
2856
2857         /*
2858          * First calculate the block statistics
2859          */
2860         bitmap_buf = malloc(fs->blocksize);
2861         if (!bitmap_buf)
2862                 return ENOMEM;
2863         for (group = 0; group < fs->group_desc_count;
2864              group++) {
2865                 retval = ext2fs_get_block_bitmap_range2(fs->block_map,
2866                         B2C(blk), fs->super->s_clusters_per_group, bitmap_buf);
2867                 if (retval) {
2868                         free(bitmap_buf);
2869                         return retval;
2870                 }
2871                 n = ext2fs_bitcount(bitmap_buf,
2872                                     fs->super->s_clusters_per_group / 8);
2873                 group_free = fs->super->s_clusters_per_group - n;
2874                 total_clusters_free += group_free;
2875                 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
2876                 ext2fs_group_desc_csum_set(fs, group);
2877                 blk += fs->super->s_blocks_per_group;
2878         }
2879         free(bitmap_buf);
2880         ext2fs_free_blocks_count_set(fs->super, C2B(total_clusters_free));
2881
2882         /*
2883          * Next, calculate the inode statistics
2884          */
2885         group_free = 0;
2886         count = 0;
2887         group = 0;
2888
2889         /* Protect loop from wrap-around if s_inodes_count maxed */
2890         uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2891         for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
2892                 if (uninit ||
2893                     !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
2894                         group_free++;
2895                         total_inodes_free++;
2896                 }
2897                 count++;
2898                 if ((count == fs->super->s_inodes_per_group) ||
2899                     (ino == fs->super->s_inodes_count)) {
2900                         ext2fs_bg_free_inodes_count_set(fs, group, group_free);
2901                         ext2fs_group_desc_csum_set(fs, group);
2902                         group++;
2903                         if (group >= fs->group_desc_count)
2904                                 break;
2905                         count = 0;
2906                         group_free = 0;
2907                         uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2908                 }
2909         }
2910         fs->super->s_free_inodes_count = total_inodes_free;
2911         ext2fs_mark_super_dirty(fs);
2912         return 0;
2913 }
2914
2915 /*
2916  *  Journal may have been relocated; update the backup journal blocks
2917  *  in the superblock.
2918  */
2919 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
2920 {
2921         errcode_t         retval;
2922         struct ext2_inode inode;
2923
2924         if (!ext2fs_has_feature_journal(fs->super))
2925                 return 0;
2926
2927         /* External journal? Nothing to do. */
2928         if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2929                 return 0;
2930
2931         retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2932         if (retval)
2933                 return retval;
2934         memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2935         fs->super->s_jnl_blocks[15] = inode.i_size_high;
2936         fs->super->s_jnl_blocks[16] = inode.i_size;
2937         fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2938         ext2fs_mark_super_dirty(fs);
2939         return 0;
2940 }
2941
2942 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2943                                int old_desc_blocks)
2944 {
2945         blk64_t super_blk, old_desc_blk, new_desc_blk;
2946         int overhead;
2947
2948         /* inode table blocks plus allocation bitmaps */
2949         overhead = fs->inode_blocks_per_group + 2;
2950
2951         ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2952                                   &old_desc_blk, &new_desc_blk, 0);
2953         if ((grp == 0) || super_blk)
2954                 overhead++;
2955         if (old_desc_blk)
2956                 overhead += old_desc_blocks;
2957         else if (new_desc_blk)
2958                 overhead++;
2959         return overhead;
2960 }
2961
2962
2963 /*
2964  * calculate the minimum number of blocks the given fs can be resized to
2965  */
2966 blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
2967 {
2968         ext2_ino_t inode_count;
2969         dgrp_t groups, flex_groups;
2970         blk64_t blks_needed, data_blocks;
2971         blk64_t grp, data_needed, last_start;
2972         blk64_t overhead = 0;
2973         int old_desc_blocks;
2974         int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2975
2976         /*
2977          * first figure out how many group descriptors we need to
2978          * handle the number of inodes we have
2979          */
2980         inode_count = fs->super->s_inodes_count -
2981                 fs->super->s_free_inodes_count;
2982         blks_needed = ext2fs_div_ceil(inode_count,
2983                                       fs->super->s_inodes_per_group) *
2984                 (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
2985         groups = ext2fs_div64_ceil(blks_needed,
2986                                    EXT2_BLOCKS_PER_GROUP(fs->super));
2987 #ifdef RESIZE2FS_DEBUG
2988         if (flags & RESIZE_DEBUG_MIN_CALC)
2989                 printf("fs has %d inodes, %d groups required.\n",
2990                        inode_count, groups);
2991 #endif
2992
2993         /*
2994          * number of old-style block group descriptor blocks
2995          */
2996         if (ext2fs_has_feature_meta_bg(fs->super))
2997                 old_desc_blocks = fs->super->s_first_meta_bg;
2998         else
2999                 old_desc_blocks = fs->desc_blocks +
3000                         fs->super->s_reserved_gdt_blocks;
3001
3002         /* calculate how many blocks are needed for data */
3003         data_needed = ext2fs_blocks_count(fs->super);
3004         for (grp = 0; grp < fs->group_desc_count; grp++) {
3005                 __u32 n = ext2fs_bg_free_blocks_count(fs, grp);
3006
3007                 if (n > EXT2_BLOCKS_PER_GROUP(fs->super))
3008                         n = EXT2_BLOCKS_PER_GROUP(fs->super);
3009                 n += calc_group_overhead(fs, grp, old_desc_blocks);
3010                 if (data_needed < n) {
3011                         if (flags & RESIZE_DEBUG_MIN_CALC)
3012                                 printf("file system appears inconsistent?!?\n");
3013                         return ext2fs_blocks_count(fs->super);
3014                 }
3015                 data_needed -= n;
3016         }
3017 #ifdef RESIZE2FS_DEBUG
3018         if (flags & RESIZE_DEBUG_MIN_CALC)
3019                 printf("fs requires %llu data blocks.\n",
3020                        (unsigned long long) data_needed);
3021 #endif
3022
3023         /*
3024          * For ext4 we need to allow for up to a flex_bg worth of
3025          * inode tables of slack space so the resize operation can be
3026          * guaranteed to finish.
3027          */
3028         flex_groups = groups;
3029         if (ext2fs_has_feature_flex_bg(fs->super)) {
3030                 dgrp_t remainder = groups & (flexbg_size - 1);
3031
3032                 flex_groups += flexbg_size - remainder;
3033                 if (flex_groups > fs->group_desc_count)
3034                         flex_groups = fs->group_desc_count;
3035         }
3036
3037         /*
3038          * figure out how many data blocks we have given the number of groups
3039          * we need for our inodes
3040          */
3041         data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
3042         last_start = 0;
3043         for (grp = 0; grp < flex_groups; grp++) {
3044                 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
3045
3046                 /*
3047                  * we want to keep track of how much data we can store in
3048                  * the groups leading up to the last group so we can determine
3049                  * how big the last group needs to be
3050                  */
3051                 if (grp < (groups - 1))
3052                         last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
3053                                 overhead;
3054
3055                 if (data_blocks > overhead)
3056                         data_blocks -= overhead;
3057                 else
3058                         data_blocks = 0;
3059         }
3060 #ifdef RESIZE2FS_DEBUG
3061         if (flags & RESIZE_DEBUG_MIN_CALC)
3062                 printf("With %d group(s), we have %llu blocks available.\n",
3063                        groups, (unsigned long long) data_blocks);
3064 #endif
3065
3066         /*
3067          * if we need more group descriptors in order to accommodate our data
3068          * then we need to add them here
3069          */
3070         blks_needed = data_needed;
3071         while (blks_needed > data_blocks) {
3072                 blk64_t remainder = blks_needed - data_blocks;
3073                 dgrp_t extra_grps;
3074
3075                 /* figure out how many more groups we need for the data */
3076                 extra_grps = ext2fs_div64_ceil(remainder,
3077                                                EXT2_BLOCKS_PER_GROUP(fs->super));
3078
3079                 data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
3080
3081                 /* ok we have to account for the last group */
3082                 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
3083                 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
3084
3085                 grp = flex_groups;
3086                 groups += extra_grps;
3087                 if (!ext2fs_has_feature_flex_bg(fs->super))
3088                         flex_groups = groups;
3089                 else if (groups > flex_groups) {
3090                         dgrp_t r = groups & (flexbg_size - 1);
3091
3092                         flex_groups = groups + flexbg_size - r;
3093                         if (flex_groups > fs->group_desc_count)
3094                                 flex_groups = fs->group_desc_count;
3095                 }
3096
3097                 for (; grp < flex_groups; grp++) {
3098                         overhead = calc_group_overhead(fs, grp,
3099                                                        old_desc_blocks);
3100
3101                         /*
3102                          * again, we need to see how much data we cram into
3103                          * all of the groups leading up to the last group
3104                          */
3105                         if (grp < groups - 1)
3106                                 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
3107                                         - overhead;
3108
3109                         data_blocks -= overhead;
3110                 }
3111
3112 #ifdef RESIZE2FS_DEBUG
3113                 if (flags & RESIZE_DEBUG_MIN_CALC)
3114                         printf("Added %d extra group(s), "
3115                                "blks_needed %llu, data_blocks %llu, "
3116                                "last_start %llu\n", extra_grps,
3117                                (unsigned long long) blks_needed,
3118                                (unsigned long long) data_blocks,
3119                                (unsigned long long) last_start);
3120 #endif
3121         }
3122
3123         /* now for the fun voodoo */
3124         grp = groups - 1;
3125         if (ext2fs_has_feature_flex_bg(fs->super) &&
3126             (grp & ~(flexbg_size - 1)) == 0)
3127                 grp = grp & ~(flexbg_size - 1);
3128         overhead = 0;
3129         for (; grp < flex_groups; grp++)
3130                 overhead += calc_group_overhead(fs, grp, old_desc_blocks);
3131
3132 #ifdef RESIZE2FS_DEBUG
3133         if (flags & RESIZE_DEBUG_MIN_CALC)
3134                 printf("Last group's overhead is %llu\n",
3135                        (unsigned long long) overhead);
3136 #endif
3137
3138         /*
3139          * if this is the case then the last group is going to have data in it
3140          * so we need to adjust the size of the last group accordingly
3141          */
3142         if (last_start < blks_needed) {
3143                 blk64_t remainder = blks_needed - last_start;
3144
3145 #ifdef RESIZE2FS_DEBUG
3146                 if (flags & RESIZE_DEBUG_MIN_CALC)
3147                         printf("Need %llu data blocks in last group\n",
3148                                (unsigned long long) remainder);
3149 #endif
3150                 /*
3151                  * 50 is a magic number that mkfs/resize uses to see if its
3152                  * even worth making/resizing the fs.  basically you need to
3153                  * have at least 50 blocks in addition to the blocks needed
3154                  * for the metadata in the last group
3155                  */
3156                 if (remainder > 50)
3157                         overhead += remainder;
3158                 else
3159                         overhead += 50;
3160         } else
3161                 overhead += 50;
3162
3163         overhead += fs->super->s_first_data_block;
3164 #ifdef RESIZE2FS_DEBUG
3165         if (flags & RESIZE_DEBUG_MIN_CALC)
3166                 printf("Final size of last group is %llu\n",
3167                        (unsigned long long) overhead);
3168 #endif
3169
3170         /* Add extra slack for bigalloc file systems */
3171         if (EXT2FS_CLUSTER_RATIO(fs) > 1)
3172                 overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
3173
3174         /*
3175          * since our last group doesn't have to be BLOCKS_PER_GROUP
3176          * large, we only do groups-1, and then add the number of
3177          * blocks needed to handle the group descriptor metadata+data
3178          * that we need
3179          */
3180         blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
3181         blks_needed += overhead;
3182
3183         /*
3184          * Make sure blks_needed covers the end of the inode table in
3185          * the last block group.
3186          */
3187         overhead = ext2fs_inode_table_loc(fs, groups-1) +
3188                 fs->inode_blocks_per_group;
3189         if (blks_needed < overhead)
3190                 blks_needed = overhead;
3191
3192 #ifdef RESIZE2FS_DEBUG
3193         if (flags & RESIZE_DEBUG_MIN_CALC)
3194                 printf("Estimated blocks needed: %llu\n",
3195                        (unsigned long long) blks_needed);
3196 #endif
3197
3198         /*
3199          * If at this point we've already added up more "needed" than
3200          * the current size, just return current size as minimum.
3201          */
3202         if (blks_needed >= ext2fs_blocks_count(fs->super))
3203                 return ext2fs_blocks_count(fs->super);
3204         /*
3205          * We need to reserve a few extra blocks if extents are
3206          * enabled, in case we need to grow the extent tree.  The more
3207          * we shrink the file system, the more space we need.
3208          *
3209          * The absolute worst case is every single data block is in
3210          * the part of the file system that needs to be evacuated,
3211          * with each data block needs to be in its own extent, and
3212          * with each inode needing at least one extent block.
3213          */
3214         if (ext2fs_has_feature_extents(fs->super)) {
3215                 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
3216                                        blks_needed)/500;
3217                 unsigned int exts_per_blk = (fs->blocksize /
3218                                              sizeof(struct ext3_extent)) - 1;
3219                 blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
3220                                       exts_per_blk);
3221
3222                 if (worst_case < inode_count)
3223                         worst_case = inode_count;
3224
3225                 if (safe_margin > worst_case)
3226                         safe_margin = worst_case;
3227
3228 #ifdef RESIZE2FS_DEBUG
3229                 if (flags & RESIZE_DEBUG_MIN_CALC)
3230                         printf("Extents safety margin: %llu\n",
3231                                (unsigned long long) safe_margin);
3232 #endif
3233                 blks_needed += safe_margin;
3234         }
3235
3236         return blks_needed;
3237 }