2 * resize2fs.c --- ext2 main routine
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
7 * Copyright (C) 1999, 2000 by Theosore Ts'o
10 * This file may be redistributed under the terms of the GNU Public
16 * Resizing a filesystem consists of the following phases:
18 * 1. Adjust superblock and write out new parts of the inode
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
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.
37 #include "resize2fs.h"
40 #ifdef __linux__ /* Kludge for debugging */
41 #define RESIZE2FS_DEBUG
44 static void fix_uninit_block_bitmaps(ext2_filsys fs);
45 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size);
46 static errcode_t blocks_to_move(ext2_resize_t rfs);
47 static errcode_t block_mover(ext2_resize_t rfs);
48 static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
49 static errcode_t inode_ref_fix(ext2_resize_t rfs);
50 static errcode_t move_itables(ext2_resize_t rfs);
51 static errcode_t fix_resize_inode(ext2_filsys fs);
52 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
53 static errcode_t fix_sb_journal_backup(ext2_filsys fs);
54 static errcode_t mark_table_blocks(ext2_filsys fs,
55 ext2fs_block_bitmap bmap);
56 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);
64 * Some helper functions to check if a block is in a metadata area
66 static inline int is_block_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
68 return blk == ext2fs_block_bitmap_loc(fs, grp);
71 static inline int is_inode_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
73 return blk == ext2fs_inode_bitmap_loc(fs, grp);
76 static int is_inode_tb(ext2_filsys fs, unsigned int grp, blk64_t blk)
78 return blk >= ext2fs_inode_table_loc(fs, grp) &&
79 blk < (ext2fs_inode_table_loc(fs, grp) +
80 fs->inode_blocks_per_group);
83 /* Some bigalloc helper macros which are more succint... */
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))
92 static int lazy_itable_init;
95 * This is the top-level routine which does the dirty deed....
97 errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
98 errcode_t (*progress)(ext2_resize_t rfs, int pass,
100 unsigned long max_val))
104 struct resource_track rtrack, overall_track;
107 * Create the data structure
109 retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
113 memset(rfs, 0, sizeof(struct ext2_resize_struct));
118 rfs->progress = progress;
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);
125 print_resource_track(rfs, &rtrack, fs->io);
127 fs->super->s_state |= EXT2_ERROR_FS;
128 ext2fs_mark_super_dirty(fs);
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);
138 init_resource_track(&rtrack, "resize_group_descriptors", fs->io);
139 retval = resize_group_descriptors(rfs, *new_size);
142 print_resource_track(rfs, &rtrack, fs->io);
144 init_resource_track(&rtrack, "move_bg_metadata", fs->io);
145 retval = move_bg_metadata(rfs);
148 print_resource_track(rfs, &rtrack, fs->io);
150 init_resource_track(&rtrack, "zero_high_bits_in_metadata", fs->io);
151 retval = zero_high_bits_in_inodes(rfs);
154 print_resource_track(rfs, &rtrack, fs->io);
156 init_resource_track(&rtrack, "adjust_superblock", fs->io);
157 retval = adjust_superblock(rfs, *new_size);
160 print_resource_track(rfs, &rtrack, fs->io);
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);
169 *new_size = ext2fs_blocks_count(rfs->new_fs->super);
171 init_resource_track(&rtrack, "blocks_to_move", fs->io);
172 retval = blocks_to_move(rfs);
175 print_resource_track(rfs, &rtrack, fs->io);
177 #ifdef RESIZE2FS_DEBUG
178 if (rfs->flags & RESIZE_DEBUG_BMOVE)
179 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
180 ext2fs_free_blocks_count(rfs->old_fs->super),
181 ext2fs_free_blocks_count(rfs->new_fs->super),
185 init_resource_track(&rtrack, "block_mover", fs->io);
186 retval = block_mover(rfs);
189 print_resource_track(rfs, &rtrack, fs->io);
191 init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
192 retval = inode_scan_and_fix(rfs);
195 print_resource_track(rfs, &rtrack, fs->io);
197 init_resource_track(&rtrack, "inode_ref_fix", fs->io);
198 retval = inode_ref_fix(rfs);
201 print_resource_track(rfs, &rtrack, fs->io);
203 init_resource_track(&rtrack, "move_itables", fs->io);
204 retval = move_itables(rfs);
207 print_resource_track(rfs, &rtrack, fs->io);
209 retval = clear_sparse_super2_last_group(rfs);
213 init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
214 retval = ext2fs_calculate_summary_stats(rfs->new_fs);
217 print_resource_track(rfs, &rtrack, fs->io);
219 init_resource_track(&rtrack, "fix_resize_inode", fs->io);
220 retval = fix_resize_inode(rfs->new_fs);
223 print_resource_track(rfs, &rtrack, fs->io);
225 init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
226 retval = fix_sb_journal_backup(rfs->new_fs);
229 print_resource_track(rfs, &rtrack, fs->io);
231 retval = ext2fs_set_gdt_csum(rfs->new_fs);
235 rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
236 rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
238 print_resource_track(rfs, &overall_track, fs->io);
239 retval = ext2fs_close_free(&rfs->new_fs);
245 ext2fs_free(rfs->old_fs);
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);
259 ext2fs_free(rfs->new_fs);
263 ext2fs_free_mem(&rfs->itable_buf);
264 ext2fs_free_mem(&rfs);
268 /* Keep the size of the group descriptor region constant */
269 static void adjust_reserved_gdt_blocks(ext2_filsys old_fs, ext2_filsys fs)
271 if (ext2fs_has_feature_resize_inode(fs->super) &&
272 (old_fs->desc_blocks != fs->desc_blocks)) {
275 new = ((int) fs->super->s_reserved_gdt_blocks) +
276 (old_fs->desc_blocks - fs->desc_blocks);
279 if (new > (int) fs->blocksize/4)
280 new = fs->blocksize/4;
281 fs->super->s_reserved_gdt_blocks = new;
285 /* Toggle 64bit mode */
286 static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size)
288 void *o, *n, *new_group_desc;
293 if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
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;
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;
310 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
311 EXT2_DESC_SIZE(rfs->new_fs->super))
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);
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);
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);
336 ext2fs_free_mem(&rfs->new_fs->group_desc);
337 rfs->new_fs->group_desc = new_group_desc;
339 for (i = 0; i < rfs->old_fs->group_desc_count; i++)
340 ext2fs_group_desc_csum_set(rfs->new_fs, i);
342 adjust_reserved_gdt_blocks(rfs->old_fs, rfs->new_fs);
347 /* Move bitmaps/inode tables out of the way. */
348 static errcode_t move_bg_metadata(ext2_resize_t rfs)
351 blk64_t b, c, d, old_desc_blocks, new_desc_blocks, j;
352 ext2fs_block_bitmap old_map, new_map;
357 if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
360 retval = ext2fs_allocate_block_bitmap(rfs->old_fs, "oldfs", &old_map);
364 retval = ext2fs_allocate_block_bitmap(rfs->new_fs, "newfs", &new_map);
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;
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;
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,
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);
389 ext2fs_mark_block_bitmap2(old_map, d);
391 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, i, &b, &c, &d,
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);
400 ext2fs_mark_block_bitmap2(new_map, d);
403 cluster_ratio = EXT2FS_CLUSTER_RATIO(rfs->new_fs);
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);
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 */
421 ext2fs_unmark_block_bitmap2(old_map, b);
422 ext2fs_unmark_block_bitmap2(new_map, b);
427 * new_map now shows blocks that have been newly allocated.
428 * old_map now shows blocks that have been newly freed.
432 * Move any conflicting bitmaps and inode tables. Ensure that we
433 * don't try to free clusters associated with bitmaps or tables.
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);
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);
448 c = ext2fs_inode_table_loc(rfs->new_fs, i);
450 b < rfs->new_fs->inode_blocks_per_group;
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);
459 /* Free unused clusters */
461 cluster_ratio > 1 && b < ext2fs_blocks_count(rfs->new_fs->super);
463 if (ext2fs_test_block_bitmap2(old_map, b))
464 ext2fs_unmark_block_bitmap2(rfs->new_fs->block_map, b);
467 ext2fs_free_block_bitmap(old_map);
469 ext2fs_free_block_bitmap(new_map);
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)
477 ext2_extent_handle_t handle;
478 struct ext2fs_extent extent;
479 int op = EXT2_EXTENT_ROOT;
482 if (!(inode->i_flags & EXT4_EXTENTS_FL))
485 errcode = ext2fs_extent_open(fs, ino, &handle);
490 errcode = ext2fs_extent_get(handle, op, &extent);
494 op = EXT2_EXTENT_NEXT_SIB;
496 if (extent.e_pblk > (1ULL << 32)) {
497 extent.e_pblk &= (1ULL << 32) - 1;
498 errcode = ext2fs_extent_replace(handle, 0, &extent);
504 /* Ok if we run off the end */
505 if (errcode == EXT2_ET_EXTENT_NO_NEXT)
507 ext2fs_extent_free(handle);
511 /* Zero out the high bits of inodes. */
512 static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs)
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;
521 if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
524 if (fs->super->s_creator_os == EXT2_OS_HURD)
527 retval = ext2fs_open_inode_scan(fs, 0, &scan);
531 retval = ext2fs_get_mem(length, &inode);
536 retval = ext2fs_get_next_inode_full(scan, &ino, inode, length);
541 if (!ext2fs_test_inode_bitmap2(fs->inode_map, ino))
545 * Here's how we deal with high block number fields:
547 * - i_size_high has been been written out with i_size_lo
548 * since the ext2 days, so no conversion is needed.
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.
556 * - i_file_acl_high can be uninitialized, so zero it if
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,
567 retval = zero_high_bits_in_extents(fs, ino, inode);
574 ext2fs_free_mem(&inode);
576 ext2fs_close_inode_scan(scan);
581 * Clean up the bitmaps for unitialized bitmaps
583 static void fix_uninit_block_bitmaps(ext2_filsys fs)
589 if (!ext2fs_has_group_desc_csum(fs))
592 for (g=0; g < fs->group_desc_count; g++) {
593 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
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,
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;
609 ext2fs_mark_block_bitmap2(fs->block_map, blk);
613 /* --------------------------------------------------------------------
615 * Resize processing, phase 1.
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 * --------------------------------------------------------------------
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.
629 static errcode_t free_gdp_blocks(ext2_filsys fs,
630 ext2fs_block_bitmap reserve_blocks,
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;
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);
647 retval = mark_table_blocks(fs, bg_map);
652 for (i = group; i < group + count; i++) {
653 blk = ext2fs_block_bitmap_loc(old_fs, i);
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);
661 blk = ext2fs_inode_bitmap_loc(old_fs, i);
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);
669 blk = ext2fs_inode_table_loc(old_fs, i);
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)))
675 ext2fs_block_alloc_stats2(fs, blk, -1);
676 ext2fs_mark_block_bitmap2(reserve_blocks, blk);
682 ext2fs_free_block_bitmap(bg_map);
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.
690 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
691 ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
694 blk64_t overhead = 0;
696 blk64_t blk, group_block;
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 */
705 ext2fs_blocks_count_set(fs->super, new_size);
708 fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
709 fs->super->s_first_data_block,
710 EXT2_BLOCKS_PER_GROUP(fs->super));
711 if (fs->group_desc_count == 0)
712 return EXT2_ET_TOOSMALL;
713 fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
714 EXT2_DESC_PER_BLOCK(fs->super));
717 * Overhead is the number of bookkeeping blocks per group. It
718 * includes the superblock backup, the group descriptor
719 * backups, the inode bitmap, the block bitmap, and the inode
722 overhead = (int) (2 + fs->inode_blocks_per_group);
725 if (ext2fs_has_feature_sparse_super2(fs->super)) {
727 * We have to do this manually since
728 * super->s_backup_bgs hasn't been set up yet.
730 if (fs->group_desc_count == 2)
731 has_bg = fs->super->s_backup_bgs[0] != 0;
733 has_bg = fs->super->s_backup_bgs[1] != 0;
735 has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
737 overhead += 1 + fs->desc_blocks +
738 fs->super->s_reserved_gdt_blocks;
741 * See if the last group is big enough to support the
742 * necessary data structures. If not, we need to get rid of
745 rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
746 fs->super->s_blocks_per_group;
747 if ((fs->group_desc_count == 1) && rem && (rem < overhead))
748 return EXT2_ET_TOOSMALL;
749 if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
750 ext2fs_blocks_count_set(fs->super,
751 ext2fs_blocks_count(fs->super) - rem);
755 * Adjust the number of inodes
757 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
758 if (new_inodes > ~0U) {
759 fprintf(stderr, _("inodes (%llu) must be less than %u"),
761 return EXT2_ET_TOO_MANY_INODES;
763 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
764 fs->group_desc_count;
767 * Adjust the number of free blocks
769 blk = ext2fs_blocks_count(old_fs->super);
770 if (blk > ext2fs_blocks_count(fs->super))
771 ext2fs_free_blocks_count_set(fs->super,
772 ext2fs_free_blocks_count(fs->super) -
773 (blk - ext2fs_blocks_count(fs->super)));
775 ext2fs_free_blocks_count_set(fs->super,
776 ext2fs_free_blocks_count(fs->super) +
777 (ext2fs_blocks_count(fs->super) - blk));
780 * Adjust the number of reserved blocks
782 percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
783 ext2fs_blocks_count(old_fs->super);
784 ext2fs_r_blocks_count_set(fs->super,
785 (percent * ext2fs_blocks_count(fs->super) /
789 * Adjust the bitmaps for size
791 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
792 fs->super->s_inodes_count,
794 if (retval) goto errout;
796 real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
797 fs->super->s_first_data_block;
798 retval = ext2fs_resize_block_bitmap2(new_size - 1,
799 real_end, fs->block_map);
800 if (retval) goto errout;
803 * If we are growing the file system, also grow the size of
804 * the reserve_blocks bitmap
806 if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
807 retval = ext2fs_resize_block_bitmap2(new_size - 1,
808 real_end, reserve_blocks);
809 if (retval) goto errout;
813 * Reallocate the group descriptors as necessary.
815 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
816 old_fs->desc_blocks != fs->desc_blocks) {
817 retval = ext2fs_resize_mem(old_fs->desc_blocks *
819 fs->desc_blocks * fs->blocksize,
823 if (fs->desc_blocks > old_fs->desc_blocks)
824 memset((char *) fs->group_desc +
825 (old_fs->desc_blocks * fs->blocksize), 0,
826 (fs->desc_blocks - old_fs->desc_blocks) *
831 * If the resize_inode feature is set, and we are changing the
832 * number of descriptor blocks, then adjust
833 * s_reserved_gdt_blocks if possible to avoid needing to move
834 * the inode table either now or in the future.
836 * Note: If we're converting to 64bit mode, we did this earlier.
838 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
839 adjust_reserved_gdt_blocks(old_fs, fs);
841 if (ext2fs_has_feature_meta_bg(fs->super) &&
842 (fs->super->s_first_meta_bg > fs->desc_blocks)) {
843 ext2fs_clear_feature_meta_bg(fs->super);
844 fs->super->s_first_meta_bg = 0;
848 * Update the location of the backup superblocks if the
849 * sparse_super2 feature is enabled.
851 if (ext2fs_has_feature_sparse_super2(fs->super)) {
852 dgrp_t last_bg = fs->group_desc_count - 1;
853 dgrp_t old_last_bg = old_fs->group_desc_count - 1;
855 if (last_bg > old_last_bg) {
856 if (old_fs->group_desc_count == 1)
857 fs->super->s_backup_bgs[0] = 1;
858 if ((old_fs->group_desc_count < 3 &&
859 fs->group_desc_count > 2) ||
860 fs->super->s_backup_bgs[1])
861 fs->super->s_backup_bgs[1] = last_bg;
862 } else if (last_bg < old_last_bg) {
863 if (fs->super->s_backup_bgs[0] > last_bg)
864 fs->super->s_backup_bgs[0] = 0;
865 if (fs->super->s_backup_bgs[1] > last_bg)
866 fs->super->s_backup_bgs[1] = 0;
868 old_fs->super->s_backup_bgs[1] == old_last_bg)
869 fs->super->s_backup_bgs[1] = last_bg;
874 * If we are shrinking the number of block groups, we're done
877 if (old_fs->group_desc_count > fs->group_desc_count) {
879 * Check the block groups that we are chopping off
880 * and free any blocks associated with their metadata
882 retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
883 fs->group_desc_count);
888 * Fix the count of the last (old) block group
890 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
891 old_fs->super->s_first_data_block) %
892 old_fs->super->s_blocks_per_group;
894 old_numblocks = old_fs->super->s_blocks_per_group;
895 if (old_fs->group_desc_count == fs->group_desc_count) {
896 numblocks = (ext2fs_blocks_count(fs->super) -
897 fs->super->s_first_data_block) %
898 fs->super->s_blocks_per_group;
900 numblocks = fs->super->s_blocks_per_group;
902 numblocks = fs->super->s_blocks_per_group;
903 i = old_fs->group_desc_count - 1;
904 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
905 ext2fs_group_desc_csum_set(fs, i);
908 * If the number of block groups is staying the same, we're
909 * done and can exit now. (If the number block groups is
910 * shrinking, we had exited earlier.)
912 if (old_fs->group_desc_count >= fs->group_desc_count) {
918 * Initialize the new block group descriptors
920 group_block = ext2fs_group_first_block2(fs,
921 old_fs->group_desc_count);
922 csum_flag = ext2fs_has_group_desc_csum(fs);
923 if (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
924 access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0)
925 lazy_itable_init = 1;
926 if (ext2fs_has_feature_meta_bg(fs->super))
927 old_desc_blocks = fs->super->s_first_meta_bg;
929 old_desc_blocks = fs->desc_blocks +
930 fs->super->s_reserved_gdt_blocks;
933 * If we changed the number of block_group descriptor blocks,
934 * we need to make sure they are all marked as reserved in the
935 * file systems's block allocation map.
937 for (i = 0; i < old_fs->group_desc_count; i++)
938 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
940 for (i = old_fs->group_desc_count;
941 i < fs->group_desc_count; i++) {
942 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
943 sizeof(struct ext2_group_desc));
946 ext2fs_bg_flags_zap(fs, i);
948 ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
949 if (!lazy_itable_init)
950 ext2fs_bg_flags_set(fs, i,
951 EXT2_BG_INODE_ZEROED);
952 ext2fs_bg_itable_unused_set(fs, i,
953 fs->super->s_inodes_per_group);
956 numblocks = ext2fs_group_blocks_count(fs, i);
957 if ((i < fs->group_desc_count - 1) && csum_flag)
958 ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
960 has_super = ext2fs_bg_has_super(fs, i);
962 ext2fs_block_alloc_stats2(fs, group_block, +1);
965 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
966 meta_bg = i / meta_bg_size;
967 if (!ext2fs_has_feature_meta_bg(fs->super) ||
968 (meta_bg < fs->super->s_first_meta_bg)) {
970 for (j=0; j < old_desc_blocks; j++)
971 ext2fs_block_alloc_stats2(fs,
972 group_block + 1 + j, +1);
973 adjblocks += old_desc_blocks;
978 if (((i % meta_bg_size) == 0) ||
979 ((i % meta_bg_size) == 1) ||
980 ((i % meta_bg_size) == (meta_bg_size-1)))
981 ext2fs_block_alloc_stats2(fs,
982 group_block + has_super, +1);
985 adjblocks += 2 + fs->inode_blocks_per_group;
987 numblocks -= adjblocks;
988 ext2fs_free_blocks_count_set(fs->super,
989 ext2fs_free_blocks_count(fs->super) - adjblocks);
990 fs->super->s_free_inodes_count +=
991 fs->super->s_inodes_per_group;
992 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
993 ext2fs_bg_free_inodes_count_set(fs, i,
994 fs->super->s_inodes_per_group);
995 ext2fs_bg_used_dirs_count_set(fs, i, 0);
996 ext2fs_group_desc_csum_set(fs, i);
998 retval = ext2fs_allocate_group_table(fs, i, 0);
999 if (retval) goto errout;
1001 group_block += fs->super->s_blocks_per_group;
1006 * Mark all of the metadata blocks as reserved so they won't
1007 * get allocated by the call to ext2fs_allocate_group_table()
1008 * in blocks_to_move(), where we allocate new blocks to
1009 * replace those allocation bitmap and inode table blocks
1010 * which have to get relocated to make space for an increased
1011 * number of the block group descriptors.
1014 mark_table_blocks(fs, reserve_blocks);
1021 * This routine adjusts the superblock and other data structures, both
1022 * in disk as well as in memory...
1024 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
1026 ext2_filsys fs = rfs->new_fs;
1029 blk64_t group_block;
1031 unsigned long max_group;
1033 ext2fs_mark_super_dirty(fs);
1034 ext2fs_mark_bb_dirty(fs);
1035 ext2fs_mark_ib_dirty(fs);
1037 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
1038 &rfs->reserve_blocks);
1042 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
1047 * Check to make sure there are enough inodes
1049 if ((rfs->old_fs->super->s_inodes_count -
1050 rfs->old_fs->super->s_free_inodes_count) >
1051 rfs->new_fs->super->s_inodes_count) {
1057 * If we are shrinking the number block groups, we're done and
1060 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
1066 * If the number of block groups is staying the same, we're
1067 * done and can exit now. (If the number block groups is
1068 * shrinking, we had exited earlier.)
1070 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
1076 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1077 * supports lazy inode initialization, we can skip
1078 * initializing the inode table.
1080 if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
1086 * Initialize the inode table
1088 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
1093 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
1094 group_block = ext2fs_group_first_block2(fs,
1095 rfs->old_fs->group_desc_count);
1096 adj = rfs->old_fs->group_desc_count;
1097 max_group = fs->group_desc_count - adj;
1098 if (rfs->progress) {
1099 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1104 for (i = rfs->old_fs->group_desc_count;
1105 i < fs->group_desc_count; i++) {
1107 * Write out the new inode table
1109 retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
1110 fs->inode_blocks_per_group, NULL,
1115 io_channel_flush(fs->io);
1116 if (rfs->progress) {
1117 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1118 i - adj + 1, max_group);
1122 group_block += fs->super->s_blocks_per_group;
1124 io_channel_flush(fs->io);
1131 /* --------------------------------------------------------------------
1133 * Resize processing, phase 2.
1135 * In this phase we adjust determine which blocks need to be moved, in
1136 * blocks_to_move(). We then copy the blocks to their ultimate new
1137 * destinations using block_mover(). Since we are copying blocks to
1138 * their new locations, again during this pass we can abort without
1140 * --------------------------------------------------------------------
1144 * This helper function creates a block bitmap with all of the
1145 * filesystem meta-data blocks.
1147 static errcode_t mark_table_blocks(ext2_filsys fs,
1148 ext2fs_block_bitmap bmap)
1153 for (i = 0; i < fs->group_desc_count; i++) {
1154 ext2fs_reserve_super_and_bgd(fs, i, bmap);
1157 * Mark the blocks used for the inode table
1159 blk = ext2fs_inode_table_loc(fs, i);
1161 ext2fs_mark_block_bitmap_range2(bmap, blk,
1162 fs->inode_blocks_per_group);
1165 * Mark block used for the block bitmap
1167 blk = ext2fs_block_bitmap_loc(fs, i);
1169 ext2fs_mark_block_bitmap2(bmap, blk);
1172 * Mark block used for the inode bitmap
1174 blk = ext2fs_inode_bitmap_loc(fs, i);
1176 ext2fs_mark_block_bitmap2(bmap, blk);
1182 * This function checks to see if a particular block (either a
1183 * superblock or a block group descriptor) overlaps with an inode or
1184 * block bitmap block, or with the inode table.
1186 static void mark_fs_metablock(ext2_resize_t rfs,
1187 ext2fs_block_bitmap meta_bmap,
1188 int group, blk64_t blk)
1190 ext2_filsys fs = rfs->new_fs;
1192 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1193 ext2fs_block_alloc_stats2(fs, blk, +1);
1196 * Check to see if we overlap with the inode or block bitmap,
1197 * or the inode tables. If not, and the block is in use, then
1198 * mark it as a block to be moved.
1200 if (is_block_bm(fs, group, blk)) {
1201 ext2fs_block_bitmap_loc_set(fs, group, 0);
1202 rfs->needed_blocks++;
1205 if (is_inode_bm(fs, group, blk)) {
1206 ext2fs_inode_bitmap_loc_set(fs, group, 0);
1207 rfs->needed_blocks++;
1210 if (is_inode_tb(fs, group, blk)) {
1211 ext2fs_inode_table_loc_set(fs, group, 0);
1212 rfs->needed_blocks++;
1215 if (ext2fs_has_feature_flex_bg(fs->super)) {
1218 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
1219 if (is_block_bm(fs, i, blk)) {
1220 ext2fs_block_bitmap_loc_set(fs, i, 0);
1221 rfs->needed_blocks++;
1224 if (is_inode_bm(fs, i, blk)) {
1225 ext2fs_inode_bitmap_loc_set(fs, i, 0);
1226 rfs->needed_blocks++;
1229 if (is_inode_tb(fs, i, blk)) {
1230 ext2fs_inode_table_loc_set(fs, i, 0);
1231 rfs->needed_blocks++;
1237 if (ext2fs_has_group_desc_csum(fs) &&
1238 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
1240 * If the block bitmap is uninitialized, which means
1241 * nothing other than standard metadata in use.
1244 } else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
1245 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1246 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1247 rfs->needed_blocks++;
1253 * This routine marks and unmarks reserved blocks in the new block
1254 * bitmap. It also determines which blocks need to be moved and
1255 * places this information into the move_blocks bitmap.
1257 static errcode_t blocks_to_move(ext2_resize_t rfs)
1261 dgrp_t i, max_groups, g;
1262 blk64_t blk, group_blk;
1263 blk64_t old_blocks, new_blocks, group_end, cluster_freed;
1265 unsigned int meta_bg, meta_bg_size;
1267 ext2_filsys fs, old_fs;
1268 ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
1272 old_fs = rfs->old_fs;
1273 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
1276 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
1281 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
1286 retval = mark_table_blocks(old_fs, meta_bmap);
1293 * If we're shrinking the filesystem, we need to move any
1294 * group's metadata blocks (either allocation bitmaps or the
1295 * inode table) which are beyond the end of the new
1298 new_size = ext2fs_blocks_count(fs->super);
1299 if (new_size < ext2fs_blocks_count(old_fs->super)) {
1300 for (g = 0; g < fs->group_desc_count; g++) {
1303 * ext2fs_allocate_group_table will re-allocate any
1304 * metadata blocks whose location is set to zero.
1306 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
1307 ext2fs_block_bitmap_loc_set(fs, g, 0);
1310 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
1311 ext2fs_inode_bitmap_loc_set(fs, g, 0);
1314 if ((ext2fs_inode_table_loc(fs, g) +
1315 fs->inode_blocks_per_group) > new_size) {
1316 ext2fs_inode_table_loc_set(fs, g, 0);
1321 retval = ext2fs_allocate_group_table(fs, g, 0);
1329 * If we're shrinking the filesystem, we need to move all of
1330 * the blocks that don't fit any more
1332 for (blk = ext2fs_blocks_count(fs->super);
1333 blk < ext2fs_blocks_count(old_fs->super); blk++) {
1334 g = ext2fs_group_of_blk2(fs, blk);
1335 if (ext2fs_has_group_desc_csum(fs) &&
1336 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
1338 * The block bitmap is uninitialized, so skip
1339 * to the next block group.
1341 blk = ext2fs_group_first_block2(fs, g+1) - 1;
1344 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1345 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1346 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1347 rfs->needed_blocks++;
1349 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1352 if (ext2fs_has_feature_meta_bg(old_fs->super))
1353 old_blocks = old_fs->super->s_first_meta_bg;
1355 old_blocks = old_fs->desc_blocks +
1356 old_fs->super->s_reserved_gdt_blocks;
1357 if (ext2fs_has_feature_meta_bg(fs->super))
1358 new_blocks = fs->super->s_first_meta_bg;
1360 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
1362 retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
1366 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
1367 EXT2_DESC_SIZE(rfs->new_fs->super) &&
1368 old_blocks == new_blocks) {
1373 max_groups = fs->group_desc_count;
1374 if (max_groups > old_fs->group_desc_count)
1375 max_groups = old_fs->group_desc_count;
1376 group_blk = old_fs->super->s_first_data_block;
1378 * If we're reducing the number of descriptor blocks, this
1379 * makes life easy. :-) We just have to mark some extra
1382 if (old_blocks > new_blocks) {
1383 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
1384 retval = ext2fs_allocate_block_bitmap(fs,
1385 _("new meta blocks"),
1390 retval = mark_table_blocks(fs, new_meta_bmap);
1395 for (i = 0; i < max_groups; i++) {
1396 if (!ext2fs_bg_has_super(old_fs, i)) {
1397 group_blk += fs->super->s_blocks_per_group;
1400 group_end = group_blk + 1 + old_blocks;
1401 for (blk = group_blk + 1 + new_blocks;
1403 if (new_meta_bmap == NULL ||
1404 !ext2fs_test_block_bitmap2(new_meta_bmap,
1407 EXT2FS_CLUSTER_RATIO(fs) -
1409 EXT2FS_CLUSTER_MASK(fs));
1410 if (cluster_freed > group_end - blk)
1411 cluster_freed = group_end - blk;
1412 ext2fs_block_alloc_stats2(fs, blk, -1);
1413 blk += EXT2FS_CLUSTER_RATIO(fs);
1414 rfs->needed_blocks -= cluster_freed;
1417 rfs->needed_blocks--;
1420 group_blk += fs->super->s_blocks_per_group;
1426 * If we're increasing the number of descriptor blocks, life
1427 * gets interesting....
1429 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
1430 flex_bg = ext2fs_has_feature_flex_bg(fs->super);
1431 /* first reserve all of the existing fs meta blocks */
1432 for (i = 0; i < max_groups; i++) {
1433 has_super = ext2fs_bg_has_super(fs, i);
1435 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
1437 meta_bg = i / meta_bg_size;
1438 if (!ext2fs_has_feature_meta_bg(fs->super) ||
1439 (meta_bg < fs->super->s_first_meta_bg)) {
1441 for (blk = group_blk+1;
1442 blk < group_blk + 1 + new_blocks; blk++)
1443 mark_fs_metablock(rfs, meta_bmap,
1449 if (((i % meta_bg_size) == 0) ||
1450 ((i % meta_bg_size) == 1) ||
1451 ((i % meta_bg_size) == (meta_bg_size-1)))
1452 mark_fs_metablock(rfs, meta_bmap, i,
1453 group_blk + has_super);
1457 * Reserve the existing meta blocks that we know
1458 * aren't to be moved.
1460 * For flex_bg file systems, in order to avoid
1461 * overwriting fs metadata (especially inode table
1462 * blocks) belonging to a different block group when
1463 * we are relocating the inode tables, we need to
1464 * reserve all existing fs metadata blocks.
1466 if (ext2fs_block_bitmap_loc(fs, i))
1467 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1468 ext2fs_block_bitmap_loc(fs, i));
1469 else if (flex_bg && i < old_fs->group_desc_count)
1470 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1471 ext2fs_block_bitmap_loc(old_fs, i));
1473 if (ext2fs_inode_bitmap_loc(fs, i))
1474 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1475 ext2fs_inode_bitmap_loc(fs, i));
1476 else if (flex_bg && i < old_fs->group_desc_count)
1477 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1478 ext2fs_inode_bitmap_loc(old_fs, i));
1480 if (ext2fs_inode_table_loc(fs, i))
1481 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1482 ext2fs_inode_table_loc(fs, i),
1483 fs->inode_blocks_per_group);
1484 else if (flex_bg && i < old_fs->group_desc_count)
1485 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1486 ext2fs_inode_table_loc(old_fs, i),
1487 old_fs->inode_blocks_per_group);
1489 group_blk += rfs->new_fs->super->s_blocks_per_group;
1492 /* Allocate the missing data structures */
1493 for (i = 0; i < max_groups; i++) {
1494 if (ext2fs_inode_table_loc(fs, i) &&
1495 ext2fs_inode_bitmap_loc(fs, i) &&
1496 ext2fs_block_bitmap_loc(fs, i))
1499 retval = ext2fs_allocate_group_table(fs, i,
1500 rfs->reserve_blocks);
1505 * For those structures that have changed, we need to
1508 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1509 (blk = ext2fs_block_bitmap_loc(fs, i))) {
1510 ext2fs_block_alloc_stats2(fs, blk, +1);
1511 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1512 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1513 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1516 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1517 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1518 ext2fs_block_alloc_stats2(fs, blk, +1);
1519 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1520 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1521 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1526 * The inode table, if we need to relocate it, is
1527 * handled specially. We have to reserve the blocks
1528 * for both the old and the new inode table, since we
1529 * can't have the inode table be destroyed during the
1530 * block relocation phase.
1532 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1533 continue; /* inode table not moved */
1535 rfs->needed_blocks += fs->inode_blocks_per_group;
1538 * Mark the new inode table as in use in the new block
1539 * allocation bitmap, and move any blocks that might
1542 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1543 j < fs->inode_blocks_per_group ; j++, blk++) {
1544 ext2fs_block_alloc_stats2(fs, blk, +1);
1545 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1546 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1547 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1552 * Make sure the old inode table is reserved in the
1553 * block reservation bitmap.
1555 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1556 j < fs->inode_blocks_per_group ; j++, blk++)
1557 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1563 ext2fs_free_block_bitmap(new_meta_bmap);
1565 ext2fs_free_block_bitmap(meta_bmap);
1571 * This helper function tries to allocate a new block. We try to
1572 * avoid hitting the original group descriptor blocks at least at
1573 * first, since we want to make it possible to recover from a badly
1574 * aborted resize operation as much as possible.
1576 * In the future, I may further modify this routine to balance out
1577 * where we get the new blocks across the various block groups.
1578 * Ideally we would allocate blocks that corresponded with the block
1579 * group of the containing inode, and keep contiguous blocks
1580 * together. However, this very difficult to do efficiently, since we
1581 * don't have the necessary information up front.
1585 #define DESPERATION 2
1587 static void init_block_alloc(ext2_resize_t rfs)
1589 rfs->alloc_state = AVOID_OLD;
1590 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1592 /* HACK for testing */
1593 if (ext2fs_blocks_count(rfs->new_fs->super) >
1594 ext2fs_blocks_count(rfs->old_fs->super))
1595 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1599 static blk64_t get_new_block(ext2_resize_t rfs)
1601 ext2_filsys fs = rfs->new_fs;
1604 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1605 if (rfs->alloc_state == DESPERATION)
1608 #ifdef RESIZE2FS_DEBUG
1609 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1610 printf("Going into desperation mode "
1611 "for block allocations\n");
1613 rfs->alloc_state = DESPERATION;
1614 rfs->new_blk = fs->super->s_first_data_block;
1617 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1618 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1620 ((rfs->alloc_state == AVOID_OLD) &&
1621 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1622 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1627 return rfs->new_blk;
1631 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
1632 blk64_t goal EXT2FS_ATTR((unused)),
1635 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1639 blk = get_new_block(rfs);
1643 #ifdef RESIZE2FS_DEBUG
1644 if (rfs->flags & 0xF)
1645 printf("get_alloc_block allocating %llu\n", blk);
1648 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1649 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1651 group = ext2fs_group_of_blk2(rfs->old_fs, blk);
1652 ext2fs_clear_block_uninit(rfs->old_fs, group);
1653 group = ext2fs_group_of_blk2(rfs->new_fs, blk);
1654 ext2fs_clear_block_uninit(rfs->new_fs, group);
1656 *ret = (blk64_t) blk;
1660 static errcode_t block_mover(ext2_resize_t rfs)
1662 blk64_t blk, old_blk, new_blk;
1663 ext2_filsys fs = rfs->new_fs;
1664 ext2_filsys old_fs = rfs->old_fs;
1668 ext2_badblocks_list badblock_list = 0;
1669 int bb_modified = 0;
1671 fs->get_alloc_block = resize2fs_get_alloc_block;
1672 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1674 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1678 new_blk = fs->super->s_first_data_block;
1679 if (!rfs->itable_buf) {
1680 retval = ext2fs_get_array(fs->blocksize,
1681 fs->inode_blocks_per_group,
1686 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1691 * The first step is to figure out where all of the blocks
1694 to_move = moved = 0;
1695 init_block_alloc(rfs);
1696 for (blk = B2C(old_fs->super->s_first_data_block);
1697 blk < ext2fs_blocks_count(old_fs->super);
1698 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1699 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1701 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1703 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1704 ext2fs_badblocks_list_del(badblock_list, blk);
1709 new_blk = get_new_block(rfs);
1714 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1715 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1721 ext2fs_free_extent_table(rfs->bmap);
1729 * Step two is to actually move the blocks
1731 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1732 if (retval) goto errout;
1734 if (rfs->progress) {
1735 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1741 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1742 if (retval) goto errout;
1745 old_blk = C2B(old_blk);
1746 new_blk = C2B(new_blk);
1748 #ifdef RESIZE2FS_DEBUG
1749 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1750 printf("Moving %llu blocks %llu->%llu\n",
1751 size, old_blk, new_blk);
1755 if (c > fs->inode_blocks_per_group)
1756 c = fs->inode_blocks_per_group;
1757 retval = io_channel_read_blk64(fs->io, old_blk, c,
1759 if (retval) goto errout;
1760 retval = io_channel_write_blk64(fs->io, new_blk, c,
1762 if (retval) goto errout;
1767 if (rfs->progress) {
1768 io_channel_flush(fs->io);
1769 retval = (rfs->progress)(rfs,
1770 E2_RSZ_BLOCK_RELOC_PASS,
1776 io_channel_flush(fs->io);
1780 if (badblock_list) {
1781 if (!retval && bb_modified)
1782 retval = ext2fs_update_bb_inode(old_fs,
1784 ext2fs_badblocks_list_free(badblock_list);
1790 /* --------------------------------------------------------------------
1792 * Resize processing, phase 3
1794 * --------------------------------------------------------------------
1799 * The extent translation table is stored in clusters so we need to
1800 * take special care when mapping a source block number to its
1801 * destination block number.
1803 static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1805 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1808 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1812 struct process_block_struct {
1816 struct ext2_inode * inode;
1823 static int process_block(ext2_filsys fs, blk64_t *block_nr,
1824 e2_blkcnt_t blockcnt,
1825 blk64_t ref_block EXT2FS_ATTR((unused)),
1826 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1828 struct process_block_struct *pb;
1830 blk64_t block, new_block;
1833 pb = (struct process_block_struct *) priv_data;
1835 if (pb->rfs->bmap) {
1836 new_block = extent_translate(fs, pb->rfs->bmap, block);
1838 *block_nr = new_block;
1839 ret |= BLOCK_CHANGED;
1841 #ifdef RESIZE2FS_DEBUG
1842 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1843 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1844 pb->old_ino, blockcnt, block,
1852 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1853 block, (int) blockcnt);
1865 static errcode_t progress_callback(ext2_filsys fs,
1866 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1867 dgrp_t group, void * priv_data)
1869 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1873 * This check is to protect against old ext2 libraries. It
1874 * shouldn't be needed against new libraries.
1879 if (rfs->progress) {
1880 io_channel_flush(fs->io);
1881 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1882 group+1, fs->group_desc_count);
1890 static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
1891 struct ext2_inode *inode, int *changed)
1897 /* No EA block or no remapping? Quit early. */
1898 if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 && !rfs->bmap)
1900 new_block = extent_translate(rfs->old_fs, rfs->bmap,
1901 ext2fs_file_acl_block(rfs->old_fs, inode));
1905 /* Set the new ACL block */
1906 ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
1908 /* Update checksum */
1909 if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
1910 err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
1913 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
1914 err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
1915 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
1918 err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
1925 ext2fs_free_mem(&buf);
1929 /* Rewrite extents */
1930 static errcode_t rewrite_extents(ext2_filsys fs, ext2_ino_t ino)
1932 ext2_extent_handle_t handle;
1933 struct ext2fs_extent extent;
1935 struct ext2_extent_info info;
1937 errcode = ext2fs_extent_open(fs, ino, &handle);
1941 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent);
1946 errcode = ext2fs_extent_get_info(handle, &info);
1951 * If this is the first extent in an extent block that we
1952 * haven't visited, rewrite the extent to force the ETB
1953 * checksum to be rewritten.
1955 if (info.curr_entry == 1 && info.curr_level != 0 &&
1956 !(extent.e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT)) {
1957 errcode = ext2fs_extent_replace(handle, 0, &extent);
1962 /* Skip to the end of a block of leaf nodes */
1963 if (extent.e_flags & EXT2_EXTENT_FLAGS_LEAF) {
1964 errcode = ext2fs_extent_get(handle,
1965 EXT2_EXTENT_LAST_SIB,
1971 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT, &extent);
1972 } while (errcode == 0);
1975 /* Ok if we run off the end */
1976 if (errcode == EXT2_ET_EXTENT_NO_NEXT)
1978 ext2fs_extent_free(handle);
1982 static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
1983 errcode_t code EXT2FS_ATTR((unused)),
1984 const char *fmt EXT2FS_ATTR((unused)),
1985 va_list args EXT2FS_ATTR((unused)))
1989 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1991 struct process_block_struct pb;
1992 ext2_ino_t ino, new_inode;
1993 struct ext2_inode *inode = NULL;
1994 ext2_inode_scan scan = NULL;
1996 char *block_buf = 0;
1997 ext2_ino_t start_to_move;
2000 if ((rfs->old_fs->group_desc_count <=
2001 rfs->new_fs->group_desc_count) &&
2005 set_com_err_hook(quiet_com_err_proc);
2007 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
2008 if (retval) goto errout;
2010 retval = ext2fs_init_dblist(rfs->old_fs, 0);
2011 if (retval) goto errout;
2012 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
2013 if (retval) goto errout;
2015 start_to_move = (rfs->new_fs->group_desc_count *
2016 rfs->new_fs->super->s_inodes_per_group);
2018 if (rfs->progress) {
2019 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
2020 0, rfs->old_fs->group_desc_count);
2024 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
2028 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
2029 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
2030 inode = malloc(inode_size);
2036 * First, copy all of the inodes that need to be moved
2037 * elsewhere in the inode table
2040 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
2041 if (retval) goto errout;
2045 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2046 continue; /* inode not in use */
2048 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
2051 /* Remap EA block */
2052 retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
2057 if (ino <= start_to_move)
2058 goto remap_blocks; /* Don't need to move inode. */
2061 * Find a new inode. Now that extents and directory blocks
2062 * are tied to the inode number through the checksum, we must
2063 * set up the new inode before we start rewriting blocks.
2065 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
2069 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
2071 inode->i_ctime = time(0);
2072 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
2078 #ifdef RESIZE2FS_DEBUG
2079 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
2080 printf("Inode moved %u->%u\n", ino, new_inode);
2083 retval = ext2fs_create_extent_table(&rfs->imap, 0);
2087 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
2091 retval = ext2fs_write_inode_full(rfs->old_fs,
2097 /* Rewrite extent block checksums with new inode number */
2098 if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
2099 (inode->i_flags & EXT4_EXTENTS_FL)) {
2100 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2101 retval = rewrite_extents(rfs->old_fs, new_inode);
2102 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2108 * Update inodes to point to new blocks; schedule directory
2109 * blocks for inode remapping. Need to write out dir blocks
2110 * with new inode numbers if we have metadata_csum enabled.
2112 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
2113 (rfs->bmap || pb.is_dir)) {
2116 pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
2117 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2118 retval = ext2fs_block_iterate3(rfs->old_fs,
2119 new_inode, 0, block_buf,
2120 process_block, &pb);
2121 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2128 } else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
2129 (rfs->bmap || pb.is_dir)) {
2130 /* inline data dir; update it too */
2131 retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
2137 io_channel_flush(rfs->old_fs->io);
2140 reset_com_err_hook();
2142 ext2fs_free_extent_table(rfs->bmap);
2146 ext2fs_close_inode_scan(scan);
2148 ext2fs_free_mem(&block_buf);
2153 /* --------------------------------------------------------------------
2155 * Resize processing, phase 4.
2157 * --------------------------------------------------------------------
2163 unsigned int max_dirs;
2167 static int check_and_change_inodes(ext2_ino_t dir,
2168 int entry EXT2FS_ATTR((unused)),
2169 struct ext2_dir_entry *dirent, int offset,
2170 int blocksize EXT2FS_ATTR((unused)),
2171 char *buf EXT2FS_ATTR((unused)),
2174 struct istruct *is = (struct istruct *) priv_data;
2175 struct ext2_inode inode;
2176 ext2_ino_t new_inode;
2180 if (is->rfs->progress && offset == 0) {
2181 io_channel_flush(is->rfs->old_fs->io);
2182 is->err = (is->rfs->progress)(is->rfs,
2183 E2_RSZ_INODE_REF_UPD_PASS,
2184 ++is->num, is->max_dirs);
2186 return DIRENT_ABORT;
2190 * If we have checksums enabled and the inode wasn't present in the
2191 * old fs, then we must rewrite all dir blocks with new checksums.
2193 if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
2194 !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
2195 ret |= DIRENT_CHANGED;
2200 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
2204 #ifdef RESIZE2FS_DEBUG
2205 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
2206 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2207 dir, ext2fs_dirent_name_len(dirent), dirent->name,
2208 dirent->inode, new_inode);
2211 dirent->inode = new_inode;
2213 /* Update the directory mtime and ctime */
2214 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
2216 inode.i_mtime = inode.i_ctime = time(0);
2217 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
2219 return ret | DIRENT_ABORT;
2222 return ret | DIRENT_CHANGED;
2225 static errcode_t inode_ref_fix(ext2_resize_t rfs)
2234 * Now, we iterate over all of the directories to update the
2238 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
2242 if (rfs->progress) {
2243 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2249 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2250 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
2251 DIRENT_FLAG_INCLUDE_EMPTY, 0,
2252 check_and_change_inodes, &is);
2253 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2261 if (rfs->progress && (is.num < is.max_dirs))
2262 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2263 is.max_dirs, is.max_dirs);
2266 ext2fs_free_extent_table(rfs->imap);
2272 /* --------------------------------------------------------------------
2274 * Resize processing, phase 5.
2276 * In this phase we actually move the inode table around, and then
2277 * update the summary statistics. This is scary, since aborting here
2278 * will potentially scramble the filesystem. (We are moving the
2279 * inode tables around in place, and so the potential for lost data,
2280 * or at the very least scrambling the mapping between filenames and
2281 * inode numbers is very high in case of a power failure here.)
2282 * --------------------------------------------------------------------
2287 * A very scary routine --- this one moves the inode table around!!!
2289 * After this you have to use the rfs->new_fs file handle to read and
2292 static errcode_t move_itables(ext2_resize_t rfs)
2296 dgrp_t i, max_groups;
2297 ext2_filsys fs = rfs->new_fs;
2299 blk64_t old_blk, new_blk, blk, cluster_freed;
2303 ext2fs_block_bitmap new_bmap = NULL;
2305 max_groups = fs->group_desc_count;
2306 if (max_groups > rfs->old_fs->group_desc_count)
2307 max_groups = rfs->old_fs->group_desc_count;
2309 size = fs->blocksize * fs->inode_blocks_per_group;
2310 if (!rfs->itable_buf) {
2311 retval = ext2fs_get_mem(size, &rfs->itable_buf);
2316 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
2317 retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
2322 retval = mark_table_blocks(fs, new_bmap);
2328 * Figure out how many inode tables we need to move
2330 to_move = moved = 0;
2331 for (i=0; i < max_groups; i++)
2332 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
2333 ext2fs_inode_table_loc(fs, i))
2341 if (rfs->progress) {
2342 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2348 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
2350 for (i=0; i < max_groups; i++) {
2351 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
2352 new_blk = ext2fs_inode_table_loc(fs, i);
2353 diff = new_blk - old_blk;
2355 #ifdef RESIZE2FS_DEBUG
2356 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2357 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2358 i, old_blk, new_blk, diff);
2366 retval = io_channel_read_blk64(fs->io, old_blk,
2367 fs->inode_blocks_per_group,
2372 * The end of the inode table segment often contains
2373 * all zeros, and we're often only moving the inode
2374 * table down a block or two. If so, we can optimize
2375 * things by not rewriting blocks that we know to be zero
2378 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
2381 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
2382 #ifdef RESIZE2FS_DEBUG
2383 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2384 printf("%d blocks of zeros...\n", n);
2386 num = fs->inode_blocks_per_group;
2390 retval = io_channel_write_blk64(fs->io, new_blk,
2391 num, rfs->itable_buf);
2393 io_channel_write_blk64(fs->io, old_blk,
2394 num, rfs->itable_buf);
2398 retval = io_channel_write_blk64(fs->io,
2399 old_blk + fs->inode_blocks_per_group,
2400 diff, (rfs->itable_buf +
2401 (fs->inode_blocks_per_group - diff) *
2407 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
2408 j < fs->inode_blocks_per_group;) {
2409 if (new_bmap == NULL ||
2410 !ext2fs_test_block_bitmap2(new_bmap, blk)) {
2411 ext2fs_block_alloc_stats2(fs, blk, -1);
2412 cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
2413 (blk & EXT2FS_CLUSTER_MASK(fs));
2414 blk += cluster_freed;
2422 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
2423 ext2fs_group_desc_csum_set(rfs->old_fs, i);
2424 ext2fs_mark_super_dirty(rfs->old_fs);
2425 ext2fs_flush(rfs->old_fs);
2427 if (rfs->progress) {
2428 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2434 mark_table_blocks(fs, fs->block_map);
2436 #ifdef RESIZE2FS_DEBUG
2437 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2438 printf("Inode table move finished.\n");
2444 ext2fs_free_block_bitmap(new_bmap);
2449 * This function is used when expanding a file system. It frees the
2450 * superblock and block group descriptor blocks from the block group
2451 * which is no longer the last block group.
2453 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
2455 ext2_filsys fs = rfs->new_fs;
2456 ext2_filsys old_fs = rfs->old_fs;
2458 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2459 dgrp_t last_bg = fs->group_desc_count - 1;
2460 blk64_t sb, old_desc;
2463 if (!ext2fs_has_feature_sparse_super2(fs->super))
2466 if (last_bg <= old_last_bg)
2469 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2470 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2473 if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
2474 old_fs->super->s_backup_bgs[1] != old_last_bg)
2477 if (fs->super->s_backup_bgs[0] == old_last_bg ||
2478 fs->super->s_backup_bgs[1] == old_last_bg)
2481 if (old_last_bg == 0)
2484 retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
2485 &sb, &old_desc, NULL, &num);
2490 ext2fs_unmark_block_bitmap2(fs->block_map, sb);
2492 ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
2497 * This function is used when shrinking a file system. We need to
2498 * utilize blocks from what will be the new last block group for the
2499 * backup superblock and block group descriptor blocks.
2500 * Unfortunately, those blocks may be used by other files or fs
2501 * metadata blocks. We need to mark them as being in use.
2503 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
2504 ext2fs_block_bitmap meta_bmap)
2506 ext2_filsys fs = rfs->new_fs;
2507 ext2_filsys old_fs = rfs->old_fs;
2509 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2510 dgrp_t last_bg = fs->group_desc_count - 1;
2512 blk64_t blk, sb, old_desc;
2516 if (!ext2fs_has_feature_sparse_super2(fs->super))
2519 if (last_bg >= old_last_bg)
2522 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2523 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2526 if (fs->super->s_backup_bgs[0] != last_bg &&
2527 fs->super->s_backup_bgs[1] != last_bg)
2530 if (old_fs->super->s_backup_bgs[0] == last_bg ||
2531 old_fs->super->s_backup_bgs[1] == last_bg)
2534 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
2535 &sb, &old_desc, NULL, &num);
2539 if (last_bg && !sb) {
2540 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2544 if (old_desc && old_desc != sb+1) {
2545 fputs(_("Should never happen! Unexpected old_desc in "
2546 "super_sparse bg?\n"),
2550 num = (old_desc) ? num : 1;
2552 /* Reserve the backup blocks */
2553 ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
2555 for (g = 0; g < fs->group_desc_count; g++) {
2558 mb = ext2fs_block_bitmap_loc(fs, g);
2559 if ((mb >= sb) && (mb < sb + num)) {
2560 ext2fs_block_bitmap_loc_set(fs, g, 0);
2563 mb = ext2fs_inode_bitmap_loc(fs, g);
2564 if ((mb >= sb) && (mb < sb + num)) {
2565 ext2fs_inode_bitmap_loc_set(fs, g, 0);
2568 mb = ext2fs_inode_table_loc(fs, g);
2569 if ((mb < sb + num) &&
2570 (sb < mb + fs->inode_blocks_per_group)) {
2571 ext2fs_inode_table_loc_set(fs, g, 0);
2575 retval = ext2fs_allocate_group_table(fs, g, 0);
2581 for (blk = sb, i = 0; i < num; blk++, i++) {
2582 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
2583 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
2584 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
2585 rfs->needed_blocks++;
2587 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
2593 * Fix the resize inode
2595 static errcode_t fix_resize_inode(ext2_filsys fs)
2597 struct ext2_inode inode;
2600 if (!ext2fs_has_feature_resize_inode(fs->super))
2603 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
2604 if (retval) goto errout;
2606 ext2fs_iblk_set(fs, &inode, 1);
2608 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
2609 if (retval) goto errout;
2611 if (!inode.i_block[EXT2_DIND_BLOCK]) {
2613 * Avoid zeroing out block #0; that's rude. This
2614 * should never happen anyway since the filesystem
2615 * should be fsck'ed and we assume it is consistent.
2617 fprintf(stderr, "%s",
2618 _("Should never happen: resize inode corrupt!\n"));
2622 retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
2627 retval = ext2fs_create_resize_inode(fs);
2636 * Finally, recalculate the summary information
2638 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
2642 unsigned int group = 0;
2643 unsigned int count = 0;
2644 blk64_t total_blocks_free = 0;
2645 int total_inodes_free = 0;
2648 blk64_t super_blk, old_desc_blk, new_desc_blk;
2649 int old_desc_blocks;
2652 * First calculate the block statistics
2654 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2655 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
2657 if (ext2fs_has_feature_meta_bg(fs->super))
2658 old_desc_blocks = fs->super->s_first_meta_bg;
2660 old_desc_blocks = fs->desc_blocks +
2661 fs->super->s_reserved_gdt_blocks;
2662 for (blk = B2C(fs->super->s_first_data_block);
2663 blk < ext2fs_blocks_count(fs->super);
2664 blk += EXT2FS_CLUSTER_RATIO(fs)) {
2666 !(EQ_CLSTR(blk, super_blk) ||
2667 ((old_desc_blk && old_desc_blocks &&
2668 GE_CLSTR(blk, old_desc_blk) &&
2669 LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
2670 ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
2671 EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
2672 EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
2673 ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
2674 LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
2675 + fs->inode_blocks_per_group))))) ||
2676 (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
2678 total_blocks_free++;
2681 if ((count == fs->super->s_clusters_per_group) ||
2682 EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
2683 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
2684 ext2fs_group_desc_csum_set(fs, group);
2686 if (group >= fs->group_desc_count)
2690 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2691 ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
2694 if (ext2fs_has_feature_meta_bg(fs->super))
2695 old_desc_blocks = fs->super->s_first_meta_bg;
2697 old_desc_blocks = fs->desc_blocks +
2698 fs->super->s_reserved_gdt_blocks;
2701 total_blocks_free = C2B(total_blocks_free);
2702 ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
2705 * Next, calculate the inode statistics
2711 /* Protect loop from wrap-around if s_inodes_count maxed */
2712 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2713 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
2715 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
2717 total_inodes_free++;
2720 if ((count == fs->super->s_inodes_per_group) ||
2721 (ino == fs->super->s_inodes_count)) {
2722 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
2723 ext2fs_group_desc_csum_set(fs, group);
2725 if (group >= fs->group_desc_count)
2729 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2732 fs->super->s_free_inodes_count = total_inodes_free;
2733 ext2fs_mark_super_dirty(fs);
2738 * Journal may have been relocated; update the backup journal blocks
2739 * in the superblock.
2741 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
2744 struct ext2_inode inode;
2746 if (!ext2fs_has_feature_journal(fs->super))
2749 /* External journal? Nothing to do. */
2750 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2753 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2756 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2757 fs->super->s_jnl_blocks[15] = inode.i_size_high;
2758 fs->super->s_jnl_blocks[16] = inode.i_size;
2759 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2760 ext2fs_mark_super_dirty(fs);
2764 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2765 int old_desc_blocks)
2767 blk64_t super_blk, old_desc_blk, new_desc_blk;
2770 /* inode table blocks plus allocation bitmaps */
2771 overhead = fs->inode_blocks_per_group + 2;
2773 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2774 &old_desc_blk, &new_desc_blk, 0);
2775 if ((grp == 0) || super_blk)
2778 overhead += old_desc_blocks;
2779 else if (new_desc_blk)
2786 * calcluate the minimum number of blocks the given fs can be resized to
2788 blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
2790 ext2_ino_t inode_count;
2791 dgrp_t groups, flex_groups;
2792 blk64_t blks_needed, data_blocks;
2793 blk64_t grp, data_needed, last_start;
2794 blk64_t overhead = 0;
2795 int old_desc_blocks;
2796 int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2799 * first figure out how many group descriptors we need to
2800 * handle the number of inodes we have
2802 inode_count = fs->super->s_inodes_count -
2803 fs->super->s_free_inodes_count;
2804 blks_needed = ext2fs_div_ceil(inode_count,
2805 fs->super->s_inodes_per_group) *
2806 (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
2807 groups = ext2fs_div64_ceil(blks_needed,
2808 EXT2_BLOCKS_PER_GROUP(fs->super));
2809 #ifdef RESIZE2FS_DEBUG
2810 if (flags & RESIZE_DEBUG_MIN_CALC)
2811 printf("fs has %d inodes, %d groups required.\n",
2812 inode_count, groups);
2816 * number of old-style block group descriptor blocks
2818 if (ext2fs_has_feature_meta_bg(fs->super))
2819 old_desc_blocks = fs->super->s_first_meta_bg;
2821 old_desc_blocks = fs->desc_blocks +
2822 fs->super->s_reserved_gdt_blocks;
2824 /* calculate how many blocks are needed for data */
2825 data_needed = ext2fs_blocks_count(fs->super) -
2826 ext2fs_free_blocks_count(fs->super);
2828 for (grp = 0; grp < fs->group_desc_count; grp++)
2829 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
2830 #ifdef RESIZE2FS_DEBUG
2831 if (flags & RESIZE_DEBUG_MIN_CALC)
2832 printf("fs requires %llu data blocks.\n", data_needed);
2836 * For ext4 we need to allow for up to a flex_bg worth of
2837 * inode tables of slack space so the resize operation can be
2838 * guaranteed to finish.
2840 flex_groups = groups;
2841 if (ext2fs_has_feature_flex_bg(fs->super)) {
2842 dgrp_t remainder = groups & (flexbg_size - 1);
2844 flex_groups += flexbg_size - remainder;
2845 if (flex_groups > fs->group_desc_count)
2846 flex_groups = fs->group_desc_count;
2850 * figure out how many data blocks we have given the number of groups
2851 * we need for our inodes
2853 data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
2855 for (grp = 0; grp < flex_groups; grp++) {
2856 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
2859 * we want to keep track of how much data we can store in
2860 * the groups leading up to the last group so we can determine
2861 * how big the last group needs to be
2863 if (grp < (groups - 1))
2864 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
2867 if (data_blocks > overhead)
2868 data_blocks -= overhead;
2872 #ifdef RESIZE2FS_DEBUG
2873 if (flags & RESIZE_DEBUG_MIN_CALC)
2874 printf("With %d group(s), we have %llu blocks available.\n",
2875 groups, data_blocks);
2879 * if we need more group descriptors in order to accomodate our data
2880 * then we need to add them here
2882 blks_needed = data_needed;
2883 while (blks_needed > data_blocks) {
2884 blk64_t remainder = blks_needed - data_blocks;
2887 /* figure out how many more groups we need for the data */
2888 extra_grps = ext2fs_div64_ceil(remainder,
2889 EXT2_BLOCKS_PER_GROUP(fs->super));
2891 data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
2893 /* ok we have to account for the last group */
2894 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2895 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
2898 groups += extra_grps;
2899 if (!ext2fs_has_feature_flex_bg(fs->super))
2900 flex_groups = groups;
2901 else if (groups > flex_groups) {
2902 dgrp_t r = groups & (flexbg_size - 1);
2904 flex_groups = groups + flexbg_size - r;
2905 if (flex_groups > fs->group_desc_count)
2906 flex_groups = fs->group_desc_count;
2909 for (; grp < flex_groups; grp++) {
2910 overhead = calc_group_overhead(fs, grp,
2914 * again, we need to see how much data we cram into
2915 * all of the groups leading up to the last group
2917 if (grp < groups - 1)
2918 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
2921 data_blocks -= overhead;
2924 #ifdef RESIZE2FS_DEBUG
2925 if (flags & RESIZE_DEBUG_MIN_CALC)
2926 printf("Added %d extra group(s), "
2927 "blks_needed %llu, data_blocks %llu, "
2928 "last_start %llu\n", extra_grps, blks_needed,
2929 data_blocks, last_start);
2933 /* now for the fun voodoo */
2935 if (ext2fs_has_feature_flex_bg(fs->super) &&
2936 (grp & ~(flexbg_size - 1)) == 0)
2937 grp = grp & ~(flexbg_size - 1);
2939 for (; grp < flex_groups; grp++)
2940 overhead += calc_group_overhead(fs, grp, old_desc_blocks);
2942 #ifdef RESIZE2FS_DEBUG
2943 if (flags & RESIZE_DEBUG_MIN_CALC)
2944 printf("Last group's overhead is %llu\n", overhead);
2948 * if this is the case then the last group is going to have data in it
2949 * so we need to adjust the size of the last group accordingly
2951 if (last_start < blks_needed) {
2952 blk64_t remainder = blks_needed - last_start;
2954 #ifdef RESIZE2FS_DEBUG
2955 if (flags & RESIZE_DEBUG_MIN_CALC)
2956 printf("Need %llu data blocks in last group\n",
2960 * 50 is a magic number that mkfs/resize uses to see if its
2961 * even worth making/resizing the fs. basically you need to
2962 * have at least 50 blocks in addition to the blocks needed
2963 * for the metadata in the last group
2966 overhead += remainder;
2972 overhead += fs->super->s_first_data_block;
2973 #ifdef RESIZE2FS_DEBUG
2974 if (flags & RESIZE_DEBUG_MIN_CALC)
2975 printf("Final size of last group is %lld\n", overhead);
2978 /* Add extra slack for bigalloc file systems */
2979 if (EXT2FS_CLUSTER_RATIO(fs) > 1)
2980 overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
2983 * since our last group doesn't have to be BLOCKS_PER_GROUP
2984 * large, we only do groups-1, and then add the number of
2985 * blocks needed to handle the group descriptor metadata+data
2988 blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
2989 blks_needed += overhead;
2992 * Make sure blks_needed covers the end of the inode table in
2993 * the last block group.
2995 overhead = ext2fs_inode_table_loc(fs, groups-1) +
2996 fs->inode_blocks_per_group;
2997 if (blks_needed < overhead)
2998 blks_needed = overhead;
3000 #ifdef RESIZE2FS_DEBUG
3001 if (flags & RESIZE_DEBUG_MIN_CALC)
3002 printf("Estimated blocks needed: %llu\n", blks_needed);
3006 * If at this point we've already added up more "needed" than
3007 * the current size, just return current size as minimum.
3009 if (blks_needed >= ext2fs_blocks_count(fs->super))
3010 return ext2fs_blocks_count(fs->super);
3012 * We need to reserve a few extra blocks if extents are
3013 * enabled, in case we need to grow the extent tree. The more
3014 * we shrink the file system, the more space we need.
3016 * The absolute worst case is every single data block is in
3017 * the part of the file system that needs to be evacuated,
3018 * with each data block needs to be in its own extent, and
3019 * with each inode needing at least one extent block.
3021 if (ext2fs_has_feature_extents(fs->super)) {
3022 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
3024 unsigned int exts_per_blk = (fs->blocksize /
3025 sizeof(struct ext3_extent)) - 1;
3026 blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
3029 if (worst_case < inode_count)
3030 worst_case = inode_count;
3032 if (safe_margin > worst_case)
3033 safe_margin = worst_case;
3035 #ifdef RESIZE2FS_DEBUG
3036 if (flags & RESIZE_DEBUG_MIN_CALC)
3037 printf("Extents safety margin: %llu\n", safe_margin);
3039 blks_needed += safe_margin;