2 * resize2fs.c --- ext2 main routine
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
7 * Copyright (C) 1999, 2000 by Theodore 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 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);
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 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))
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 = resize2fs_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 uninitialized 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);
706 fs->super->s_overhead_clusters = 0;
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));
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
723 overhead = (int) (2 + fs->inode_blocks_per_group);
726 if (ext2fs_has_feature_sparse_super2(fs->super)) {
728 * We have to do this manually since
729 * super->s_backup_bgs hasn't been set up yet.
731 if (fs->group_desc_count == 2)
732 has_bg = fs->super->s_backup_bgs[0] != 0;
734 has_bg = fs->super->s_backup_bgs[1] != 0;
736 has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
738 overhead += 1 + fs->desc_blocks +
739 fs->super->s_reserved_gdt_blocks;
742 * See if the last group is big enough to support the
743 * necessary data structures. If not, we need to get rid of
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);
756 * Adjust the number of inodes
758 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
759 if (new_inodes > ~0U) {
760 fprintf(stderr, _("inodes (%llu) must be less than %u\n"),
762 return EXT2_ET_TOO_MANY_INODES;
764 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
765 fs->group_desc_count;
768 * Adjust the number of free blocks
770 blk = ext2fs_blocks_count(old_fs->super);
771 if (blk > ext2fs_blocks_count(fs->super))
772 ext2fs_free_blocks_count_set(fs->super,
773 ext2fs_free_blocks_count(fs->super) -
774 (blk - ext2fs_blocks_count(fs->super)));
776 ext2fs_free_blocks_count_set(fs->super,
777 ext2fs_free_blocks_count(fs->super) +
778 (ext2fs_blocks_count(fs->super) - blk));
781 * Adjust the number of reserved blocks
783 percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
784 ext2fs_blocks_count(old_fs->super);
785 ext2fs_r_blocks_count_set(fs->super,
786 (percent * ext2fs_blocks_count(fs->super) /
790 * Adjust the bitmaps for size
792 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
793 fs->super->s_inodes_count,
795 if (retval) goto errout;
797 real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
798 fs->super->s_first_data_block;
799 retval = ext2fs_resize_block_bitmap2(new_size - 1,
800 real_end, fs->block_map);
801 if (retval) goto errout;
804 * If we are growing the file system, also grow the size of
805 * the reserve_blocks bitmap
807 if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
808 retval = ext2fs_resize_block_bitmap2(new_size - 1,
809 real_end, reserve_blocks);
810 if (retval) goto errout;
814 * Reallocate the group descriptors as necessary.
816 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
817 old_fs->desc_blocks != fs->desc_blocks) {
818 retval = ext2fs_resize_mem(old_fs->desc_blocks *
820 fs->desc_blocks * fs->blocksize,
824 if (fs->desc_blocks > old_fs->desc_blocks)
825 memset((char *) fs->group_desc +
826 (old_fs->desc_blocks * fs->blocksize), 0,
827 (fs->desc_blocks - old_fs->desc_blocks) *
832 * If the resize_inode feature is set, and we are changing the
833 * number of descriptor blocks, then adjust
834 * s_reserved_gdt_blocks if possible to avoid needing to move
835 * the inode table either now or in the future.
837 * Note: If we're converting to 64bit mode, we did this earlier.
839 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
840 adjust_reserved_gdt_blocks(old_fs, fs);
842 if (ext2fs_has_feature_meta_bg(fs->super) &&
843 (fs->super->s_first_meta_bg > fs->desc_blocks)) {
844 ext2fs_clear_feature_meta_bg(fs->super);
845 fs->super->s_first_meta_bg = 0;
849 * Update the location of the backup superblocks if the
850 * sparse_super2 feature is enabled.
852 if (ext2fs_has_feature_sparse_super2(fs->super)) {
853 dgrp_t last_bg = fs->group_desc_count - 1;
854 dgrp_t old_last_bg = old_fs->group_desc_count - 1;
856 if (last_bg > old_last_bg) {
857 if (old_fs->group_desc_count == 1)
858 fs->super->s_backup_bgs[0] = 1;
859 if ((old_fs->group_desc_count < 3 &&
860 fs->group_desc_count > 2) ||
861 fs->super->s_backup_bgs[1])
862 fs->super->s_backup_bgs[1] = last_bg;
863 } else if (last_bg < old_last_bg) {
864 if (fs->super->s_backup_bgs[0] > last_bg)
865 fs->super->s_backup_bgs[0] = 0;
866 if (fs->super->s_backup_bgs[1] > last_bg)
867 fs->super->s_backup_bgs[1] = 0;
869 old_fs->super->s_backup_bgs[1] == old_last_bg)
870 fs->super->s_backup_bgs[1] = last_bg;
875 * If we are shrinking the number of block groups, we're done
878 if (old_fs->group_desc_count > fs->group_desc_count) {
880 * Check the block groups that we are chopping off
881 * and free any blocks associated with their metadata
883 retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
884 fs->group_desc_count);
889 * Fix the count of the last (old) block group
891 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
892 old_fs->super->s_first_data_block) %
893 old_fs->super->s_blocks_per_group;
895 old_numblocks = old_fs->super->s_blocks_per_group;
896 if (old_fs->group_desc_count == fs->group_desc_count) {
897 numblocks = (ext2fs_blocks_count(fs->super) -
898 fs->super->s_first_data_block) %
899 fs->super->s_blocks_per_group;
901 numblocks = fs->super->s_blocks_per_group;
903 numblocks = fs->super->s_blocks_per_group;
904 i = old_fs->group_desc_count - 1;
905 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
906 ext2fs_group_desc_csum_set(fs, i);
909 * If the number of block groups is staying the same, we're
910 * done and can exit now. (If the number block groups is
911 * shrinking, we had exited earlier.)
913 if (old_fs->group_desc_count >= fs->group_desc_count) {
919 * Initialize the new block group descriptors
921 group_block = ext2fs_group_first_block2(fs,
922 old_fs->group_desc_count);
923 csum_flag = ext2fs_has_group_desc_csum(fs);
924 if (getenv("RESIZE2FS_FORCE_LAZY_ITABLE_INIT") ||
925 (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
926 access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0))
927 lazy_itable_init = 1;
928 if (ext2fs_has_feature_meta_bg(fs->super))
929 old_desc_blocks = fs->super->s_first_meta_bg;
931 old_desc_blocks = fs->desc_blocks +
932 fs->super->s_reserved_gdt_blocks;
935 * If we changed the number of block_group descriptor blocks,
936 * we need to make sure they are all marked as reserved in the
937 * filesystem's block allocation map.
939 for (i = 0; i < old_fs->group_desc_count; i++)
940 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
942 for (i = old_fs->group_desc_count;
943 i < fs->group_desc_count; i++) {
944 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
945 sizeof(struct ext2_group_desc));
948 ext2fs_bg_flags_zap(fs, i);
950 ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
951 if (!lazy_itable_init)
952 ext2fs_bg_flags_set(fs, i,
953 EXT2_BG_INODE_ZEROED);
954 ext2fs_bg_itable_unused_set(fs, i,
955 fs->super->s_inodes_per_group);
958 numblocks = ext2fs_group_blocks_count(fs, i);
959 if ((i < fs->group_desc_count - 1) && csum_flag)
960 ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
962 has_super = ext2fs_bg_has_super(fs, i);
964 ext2fs_block_alloc_stats2(fs, group_block, +1);
967 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
968 meta_bg = i / meta_bg_size;
969 if (!ext2fs_has_feature_meta_bg(fs->super) ||
970 (meta_bg < fs->super->s_first_meta_bg)) {
972 for (j=0; j < old_desc_blocks; j++)
973 ext2fs_block_alloc_stats2(fs,
974 group_block + 1 + j, +1);
975 adjblocks += old_desc_blocks;
980 if (((i % meta_bg_size) == 0) ||
981 ((i % meta_bg_size) == 1) ||
982 ((i % meta_bg_size) == (meta_bg_size-1)))
983 ext2fs_block_alloc_stats2(fs,
984 group_block + has_super, +1);
987 adjblocks += 2 + fs->inode_blocks_per_group;
989 numblocks -= adjblocks;
990 ext2fs_free_blocks_count_set(fs->super,
991 ext2fs_free_blocks_count(fs->super) - adjblocks);
992 fs->super->s_free_inodes_count +=
993 fs->super->s_inodes_per_group;
994 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
995 ext2fs_bg_free_inodes_count_set(fs, i,
996 fs->super->s_inodes_per_group);
997 ext2fs_bg_used_dirs_count_set(fs, i, 0);
998 ext2fs_group_desc_csum_set(fs, i);
1000 retval = ext2fs_allocate_group_table(fs, i, 0);
1001 if (retval) goto errout;
1003 group_block += fs->super->s_blocks_per_group;
1008 * Mark all of the metadata blocks as reserved so they won't
1009 * get allocated by the call to ext2fs_allocate_group_table()
1010 * in blocks_to_move(), where we allocate new blocks to
1011 * replace those allocation bitmap and inode table blocks
1012 * which have to get relocated to make space for an increased
1013 * number of the block group descriptors.
1016 mark_table_blocks(fs, reserve_blocks);
1023 * This routine adjusts the superblock and other data structures, both
1024 * in disk as well as in memory...
1026 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
1028 ext2_filsys fs = rfs->new_fs;
1031 blk64_t group_block;
1033 unsigned long max_group;
1035 ext2fs_mark_super_dirty(fs);
1036 ext2fs_mark_bb_dirty(fs);
1037 ext2fs_mark_ib_dirty(fs);
1039 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
1040 &rfs->reserve_blocks);
1044 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
1049 * Check to make sure there are enough inodes
1051 if ((rfs->old_fs->super->s_inodes_count -
1052 rfs->old_fs->super->s_free_inodes_count) >
1053 rfs->new_fs->super->s_inodes_count) {
1059 * If we are shrinking the number block groups, we're done and
1062 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
1068 * If the number of block groups is staying the same, we're
1069 * done and can exit now. (If the number block groups is
1070 * shrinking, we had exited earlier.)
1072 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
1078 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1079 * supports lazy inode initialization, we can skip
1080 * initializing the inode table.
1082 if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
1088 * Initialize the inode table
1090 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
1095 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
1096 group_block = ext2fs_group_first_block2(fs,
1097 rfs->old_fs->group_desc_count);
1098 adj = rfs->old_fs->group_desc_count;
1099 max_group = fs->group_desc_count - adj;
1100 if (rfs->progress) {
1101 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1106 for (i = rfs->old_fs->group_desc_count;
1107 i < fs->group_desc_count; i++) {
1109 * Write out the new inode table
1111 retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
1112 fs->inode_blocks_per_group, NULL,
1117 io_channel_flush(fs->io);
1118 if (rfs->progress) {
1119 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1120 i - adj + 1, max_group);
1124 group_block += fs->super->s_blocks_per_group;
1126 io_channel_flush(fs->io);
1133 /* --------------------------------------------------------------------
1135 * Resize processing, phase 2.
1137 * In this phase we adjust determine which blocks need to be moved, in
1138 * blocks_to_move(). We then copy the blocks to their ultimate new
1139 * destinations using block_mover(). Since we are copying blocks to
1140 * their new locations, again during this pass we can abort without
1142 * --------------------------------------------------------------------
1146 * This helper function creates a block bitmap with all of the
1147 * filesystem meta-data blocks.
1149 static errcode_t mark_table_blocks(ext2_filsys fs,
1150 ext2fs_block_bitmap bmap)
1155 for (i = 0; i < fs->group_desc_count; i++) {
1156 ext2fs_reserve_super_and_bgd(fs, i, bmap);
1159 * Mark the blocks used for the inode table
1161 blk = ext2fs_inode_table_loc(fs, i);
1163 ext2fs_mark_block_bitmap_range2(bmap, blk,
1164 fs->inode_blocks_per_group);
1167 * Mark block used for the block bitmap
1169 blk = ext2fs_block_bitmap_loc(fs, i);
1171 ext2fs_mark_block_bitmap2(bmap, blk);
1174 * Mark block used for the inode bitmap
1176 blk = ext2fs_inode_bitmap_loc(fs, i);
1178 ext2fs_mark_block_bitmap2(bmap, blk);
1184 * This function checks to see if a particular block (either a
1185 * superblock or a block group descriptor) overlaps with an inode or
1186 * block bitmap block, or with the inode table.
1188 static void mark_fs_metablock(ext2_resize_t rfs,
1189 ext2fs_block_bitmap meta_bmap,
1190 int group, blk64_t blk)
1192 ext2_filsys fs = rfs->new_fs;
1194 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1195 ext2fs_block_alloc_stats2(fs, blk, +1);
1198 * Check to see if we overlap with the inode or block bitmap,
1199 * or the inode tables. If not, and the block is in use, then
1200 * mark it as a block to be moved.
1202 if (is_block_bm(fs, group, blk)) {
1203 ext2fs_block_bitmap_loc_set(fs, group, 0);
1204 rfs->needed_blocks++;
1207 if (is_inode_bm(fs, group, blk)) {
1208 ext2fs_inode_bitmap_loc_set(fs, group, 0);
1209 rfs->needed_blocks++;
1212 if (is_inode_tb(fs, group, blk)) {
1213 ext2fs_inode_table_loc_set(fs, group, 0);
1214 rfs->needed_blocks++;
1217 if (ext2fs_has_feature_flex_bg(fs->super)) {
1220 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
1221 if (is_block_bm(fs, i, blk)) {
1222 ext2fs_block_bitmap_loc_set(fs, i, 0);
1223 rfs->needed_blocks++;
1226 if (is_inode_bm(fs, i, blk)) {
1227 ext2fs_inode_bitmap_loc_set(fs, i, 0);
1228 rfs->needed_blocks++;
1231 if (is_inode_tb(fs, i, blk)) {
1232 ext2fs_inode_table_loc_set(fs, i, 0);
1233 rfs->needed_blocks++;
1239 if (ext2fs_has_group_desc_csum(fs) &&
1240 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
1242 * If the block bitmap is uninitialized, which means
1243 * nothing other than standard metadata in use.
1246 } else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
1247 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1248 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1249 rfs->needed_blocks++;
1255 * This routine marks and unmarks reserved blocks in the new block
1256 * bitmap. It also determines which blocks need to be moved and
1257 * places this information into the move_blocks bitmap.
1259 static errcode_t blocks_to_move(ext2_resize_t rfs)
1263 dgrp_t i, max_groups, g;
1264 blk64_t blk, group_blk;
1265 blk64_t old_blocks, new_blocks, group_end, cluster_freed;
1267 unsigned int meta_bg, meta_bg_size;
1269 ext2_filsys fs, old_fs;
1270 ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
1274 old_fs = rfs->old_fs;
1275 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
1278 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
1283 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
1288 retval = mark_table_blocks(old_fs, meta_bmap);
1295 * If we're shrinking the filesystem, we need to move any
1296 * group's metadata blocks (either allocation bitmaps or the
1297 * inode table) which are beyond the end of the new
1300 new_size = ext2fs_blocks_count(fs->super);
1301 if (new_size < ext2fs_blocks_count(old_fs->super)) {
1302 for (g = 0; g < fs->group_desc_count; g++) {
1305 * ext2fs_allocate_group_table will re-allocate any
1306 * metadata blocks whose location is set to zero.
1308 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
1309 ext2fs_block_bitmap_loc_set(fs, g, 0);
1312 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
1313 ext2fs_inode_bitmap_loc_set(fs, g, 0);
1316 if ((ext2fs_inode_table_loc(fs, g) +
1317 fs->inode_blocks_per_group) > new_size) {
1318 ext2fs_inode_table_loc_set(fs, g, 0);
1323 retval = ext2fs_allocate_group_table(fs, g, 0);
1331 * If we're shrinking the filesystem, we need to move all of
1332 * the blocks that don't fit any more
1334 for (blk = ext2fs_blocks_count(fs->super);
1335 blk < ext2fs_blocks_count(old_fs->super); blk++) {
1336 g = ext2fs_group_of_blk2(fs, blk);
1337 if (ext2fs_has_group_desc_csum(fs) &&
1338 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
1340 * The block bitmap is uninitialized, so skip
1341 * to the next block group.
1343 blk = ext2fs_group_first_block2(fs, g+1) - 1;
1346 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1347 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1348 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1349 rfs->needed_blocks++;
1351 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1354 if (ext2fs_has_feature_meta_bg(old_fs->super))
1355 old_blocks = old_fs->super->s_first_meta_bg;
1357 old_blocks = old_fs->desc_blocks +
1358 old_fs->super->s_reserved_gdt_blocks;
1359 if (ext2fs_has_feature_meta_bg(fs->super))
1360 new_blocks = fs->super->s_first_meta_bg;
1362 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
1364 retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
1368 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
1369 EXT2_DESC_SIZE(rfs->new_fs->super) &&
1370 old_blocks == new_blocks) {
1375 max_groups = fs->group_desc_count;
1376 if (max_groups > old_fs->group_desc_count)
1377 max_groups = old_fs->group_desc_count;
1378 group_blk = old_fs->super->s_first_data_block;
1380 * If we're reducing the number of descriptor blocks, this
1381 * makes life easy. :-) We just have to mark some extra
1384 if (old_blocks > new_blocks) {
1385 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
1386 retval = ext2fs_allocate_block_bitmap(fs,
1387 _("new meta blocks"),
1392 retval = mark_table_blocks(fs, new_meta_bmap);
1397 for (i = 0; i < max_groups; i++) {
1398 if (!ext2fs_bg_has_super(old_fs, i)) {
1399 group_blk += fs->super->s_blocks_per_group;
1402 group_end = group_blk + 1 + old_blocks;
1403 for (blk = group_blk + 1 + new_blocks;
1405 if (new_meta_bmap == NULL ||
1406 !ext2fs_test_block_bitmap2(new_meta_bmap,
1409 EXT2FS_CLUSTER_RATIO(fs) -
1411 EXT2FS_CLUSTER_MASK(fs));
1412 if (cluster_freed > group_end - blk)
1413 cluster_freed = group_end - blk;
1414 ext2fs_block_alloc_stats2(fs, blk, -1);
1415 blk += EXT2FS_CLUSTER_RATIO(fs);
1416 rfs->needed_blocks -= cluster_freed;
1419 rfs->needed_blocks--;
1422 group_blk += fs->super->s_blocks_per_group;
1428 * If we're increasing the number of descriptor blocks, life
1429 * gets interesting....
1431 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
1432 flex_bg = ext2fs_has_feature_flex_bg(fs->super);
1433 /* first reserve all of the existing fs meta blocks */
1434 for (i = 0; i < max_groups; i++) {
1435 has_super = ext2fs_bg_has_super(fs, i);
1437 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
1439 meta_bg = i / meta_bg_size;
1440 if (!ext2fs_has_feature_meta_bg(fs->super) ||
1441 (meta_bg < fs->super->s_first_meta_bg)) {
1443 for (blk = group_blk+1;
1444 blk < group_blk + 1 + new_blocks; blk++)
1445 mark_fs_metablock(rfs, meta_bmap,
1451 if (((i % meta_bg_size) == 0) ||
1452 ((i % meta_bg_size) == 1) ||
1453 ((i % meta_bg_size) == (meta_bg_size-1)))
1454 mark_fs_metablock(rfs, meta_bmap, i,
1455 group_blk + has_super);
1459 * Reserve the existing meta blocks that we know
1460 * aren't to be moved.
1462 * For flex_bg file systems, in order to avoid
1463 * overwriting fs metadata (especially inode table
1464 * blocks) belonging to a different block group when
1465 * we are relocating the inode tables, we need to
1466 * reserve all existing fs metadata blocks.
1468 if (ext2fs_block_bitmap_loc(fs, i))
1469 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1470 ext2fs_block_bitmap_loc(fs, i));
1471 else if (flex_bg && i < old_fs->group_desc_count)
1472 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1473 ext2fs_block_bitmap_loc(old_fs, i));
1475 if (ext2fs_inode_bitmap_loc(fs, i))
1476 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1477 ext2fs_inode_bitmap_loc(fs, i));
1478 else if (flex_bg && i < old_fs->group_desc_count)
1479 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1480 ext2fs_inode_bitmap_loc(old_fs, i));
1482 if (ext2fs_inode_table_loc(fs, i))
1483 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1484 ext2fs_inode_table_loc(fs, i),
1485 fs->inode_blocks_per_group);
1486 else if (flex_bg && i < old_fs->group_desc_count)
1487 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1488 ext2fs_inode_table_loc(old_fs, i),
1489 old_fs->inode_blocks_per_group);
1491 group_blk += rfs->new_fs->super->s_blocks_per_group;
1494 /* Allocate the missing data structures */
1495 for (i = 0; i < max_groups; i++) {
1496 if (ext2fs_inode_table_loc(fs, i) &&
1497 ext2fs_inode_bitmap_loc(fs, i) &&
1498 ext2fs_block_bitmap_loc(fs, i))
1501 retval = ext2fs_allocate_group_table(fs, i,
1502 rfs->reserve_blocks);
1507 * For those structures that have changed, we need to
1510 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1511 (blk = ext2fs_block_bitmap_loc(fs, i))) {
1512 ext2fs_block_alloc_stats2(fs, blk, +1);
1513 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1514 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1515 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1518 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1519 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1520 ext2fs_block_alloc_stats2(fs, blk, +1);
1521 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1522 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1523 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1528 * The inode table, if we need to relocate it, is
1529 * handled specially. We have to reserve the blocks
1530 * for both the old and the new inode table, since we
1531 * can't have the inode table be destroyed during the
1532 * block relocation phase.
1534 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1535 continue; /* inode table not moved */
1537 rfs->needed_blocks += fs->inode_blocks_per_group;
1540 * Mark the new inode table as in use in the new block
1541 * allocation bitmap, and move any blocks that might
1544 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1545 j < fs->inode_blocks_per_group ; j++, blk++) {
1546 ext2fs_block_alloc_stats2(fs, blk, +1);
1547 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1548 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1549 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1554 * Make sure the old inode table is reserved in the
1555 * block reservation bitmap.
1557 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1558 j < fs->inode_blocks_per_group ; j++, blk++)
1559 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1565 ext2fs_free_block_bitmap(new_meta_bmap);
1567 ext2fs_free_block_bitmap(meta_bmap);
1573 * This helper function tries to allocate a new block. We try to
1574 * avoid hitting the original group descriptor blocks at least at
1575 * first, since we want to make it possible to recover from a badly
1576 * aborted resize operation as much as possible.
1578 * In the future, I may further modify this routine to balance out
1579 * where we get the new blocks across the various block groups.
1580 * Ideally we would allocate blocks that corresponded with the block
1581 * group of the containing inode, and keep contiguous blocks
1582 * together. However, this very difficult to do efficiently, since we
1583 * don't have the necessary information up front.
1587 #define DESPERATION 2
1589 static void init_block_alloc(ext2_resize_t rfs)
1591 rfs->alloc_state = AVOID_OLD;
1592 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1594 /* HACK for testing */
1595 if (ext2fs_blocks_count(rfs->new_fs->super) >
1596 ext2fs_blocks_count(rfs->old_fs->super))
1597 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1601 static blk64_t get_new_block(ext2_resize_t rfs)
1603 ext2_filsys fs = rfs->new_fs;
1606 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1607 if (rfs->alloc_state == DESPERATION)
1610 #ifdef RESIZE2FS_DEBUG
1611 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1612 printf("Going into desperation mode "
1613 "for block allocations\n");
1615 rfs->alloc_state = DESPERATION;
1616 rfs->new_blk = fs->super->s_first_data_block;
1619 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1620 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1622 ((rfs->alloc_state == AVOID_OLD) &&
1623 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1624 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1629 return rfs->new_blk;
1633 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
1634 blk64_t goal EXT2FS_ATTR((unused)),
1637 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1641 blk = get_new_block(rfs);
1645 #ifdef RESIZE2FS_DEBUG
1646 if (rfs->flags & 0xF)
1647 printf("get_alloc_block allocating %llu\n", blk);
1650 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1651 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1653 group = ext2fs_group_of_blk2(rfs->old_fs, blk);
1654 ext2fs_clear_block_uninit(rfs->old_fs, group);
1655 group = ext2fs_group_of_blk2(rfs->new_fs, blk);
1656 ext2fs_clear_block_uninit(rfs->new_fs, group);
1658 *ret = (blk64_t) blk;
1662 static errcode_t block_mover(ext2_resize_t rfs)
1664 blk64_t blk, old_blk, new_blk;
1665 ext2_filsys fs = rfs->new_fs;
1666 ext2_filsys old_fs = rfs->old_fs;
1670 ext2_badblocks_list badblock_list = 0;
1671 int bb_modified = 0;
1673 fs->get_alloc_block = resize2fs_get_alloc_block;
1674 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1676 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1680 new_blk = fs->super->s_first_data_block;
1681 if (!rfs->itable_buf) {
1682 retval = ext2fs_get_array(fs->blocksize,
1683 fs->inode_blocks_per_group,
1688 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1693 * The first step is to figure out where all of the blocks
1696 to_move = moved = 0;
1697 init_block_alloc(rfs);
1698 for (blk = B2C(old_fs->super->s_first_data_block);
1699 blk < ext2fs_blocks_count(old_fs->super);
1700 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1701 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1703 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1705 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1706 ext2fs_badblocks_list_del(badblock_list, blk);
1711 new_blk = get_new_block(rfs);
1716 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1717 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1723 ext2fs_free_extent_table(rfs->bmap);
1731 * Step two is to actually move the blocks
1733 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1734 if (retval) goto errout;
1736 if (rfs->progress) {
1737 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1743 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1744 if (retval) goto errout;
1747 old_blk = C2B(old_blk);
1748 new_blk = C2B(new_blk);
1750 #ifdef RESIZE2FS_DEBUG
1751 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1752 printf("Moving %llu blocks %llu->%llu\n",
1753 size, old_blk, new_blk);
1757 if (c > fs->inode_blocks_per_group)
1758 c = fs->inode_blocks_per_group;
1759 retval = io_channel_read_blk64(fs->io, old_blk, c,
1761 if (retval) goto errout;
1762 retval = io_channel_write_blk64(fs->io, new_blk, c,
1764 if (retval) goto errout;
1769 if (rfs->progress) {
1770 io_channel_flush(fs->io);
1771 retval = (rfs->progress)(rfs,
1772 E2_RSZ_BLOCK_RELOC_PASS,
1778 io_channel_flush(fs->io);
1782 if (badblock_list) {
1783 if (!retval && bb_modified)
1784 retval = ext2fs_update_bb_inode(old_fs,
1786 ext2fs_badblocks_list_free(badblock_list);
1792 /* --------------------------------------------------------------------
1794 * Resize processing, phase 3
1796 * --------------------------------------------------------------------
1801 * The extent translation table is stored in clusters so we need to
1802 * take special care when mapping a source block number to its
1803 * destination block number.
1805 static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1807 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1810 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1814 struct process_block_struct {
1818 struct ext2_inode * inode;
1825 static int process_block(ext2_filsys fs, blk64_t *block_nr,
1826 e2_blkcnt_t blockcnt,
1827 blk64_t ref_block EXT2FS_ATTR((unused)),
1828 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1830 struct process_block_struct *pb;
1832 blk64_t block, new_block;
1835 pb = (struct process_block_struct *) priv_data;
1837 if (pb->rfs->bmap) {
1838 new_block = extent_translate(fs, pb->rfs->bmap, block);
1840 *block_nr = new_block;
1841 ret |= BLOCK_CHANGED;
1843 #ifdef RESIZE2FS_DEBUG
1844 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1845 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1846 pb->old_ino, blockcnt, block,
1854 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1855 block, (int) blockcnt);
1867 static errcode_t progress_callback(ext2_filsys fs,
1868 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1869 dgrp_t group, void * priv_data)
1871 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1875 * This check is to protect against old ext2 libraries. It
1876 * shouldn't be needed against new libraries.
1881 if (rfs->progress) {
1882 io_channel_flush(fs->io);
1883 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1884 group+1, fs->group_desc_count);
1892 static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
1893 struct ext2_inode *inode, int *changed)
1899 /* No EA block or no remapping? Quit early. */
1900 if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 || !rfs->bmap)
1902 new_block = extent_translate(rfs->old_fs, rfs->bmap,
1903 ext2fs_file_acl_block(rfs->old_fs, inode));
1907 /* Set the new ACL block */
1908 ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
1910 /* Update checksum */
1911 if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
1912 err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
1915 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
1916 err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
1917 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
1920 err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
1927 ext2fs_free_mem(&buf);
1931 static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
1932 errcode_t code EXT2FS_ATTR((unused)),
1933 const char *fmt EXT2FS_ATTR((unused)),
1934 va_list args EXT2FS_ATTR((unused)))
1938 static int fix_ea_entries(ext2_extent imap, struct ext2_ext_attr_entry *entry,
1939 struct ext2_ext_attr_entry *end, ext2_ino_t last_ino)
1944 while (entry < end && !EXT2_EXT_IS_LAST_ENTRY(entry)) {
1945 if (entry->e_value_inum > last_ino) {
1946 new_ino = ext2fs_extent_translate(imap,
1947 entry->e_value_inum);
1948 entry->e_value_inum = new_ino;
1951 entry = EXT2_EXT_ATTR_NEXT(entry);
1956 static int fix_ea_ibody_entries(ext2_extent imap,
1957 struct ext2_inode_large *inode, int inode_size,
1958 ext2_ino_t last_ino)
1960 struct ext2_ext_attr_entry *start, *end;
1963 if (inode->i_extra_isize == 0)
1966 ea_magic = (__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
1967 inode->i_extra_isize);
1968 if (*ea_magic != EXT2_EXT_ATTR_MAGIC)
1971 start = (struct ext2_ext_attr_entry *)(ea_magic + 1);
1972 end = (struct ext2_ext_attr_entry *)((char *)inode + inode_size);
1974 return fix_ea_entries(imap, start, end, last_ino);
1977 static int fix_ea_block_entries(ext2_extent imap, char *block_buf,
1978 unsigned int blocksize, ext2_ino_t last_ino)
1980 struct ext2_ext_attr_header *header;
1981 struct ext2_ext_attr_entry *start, *end;
1983 header = (struct ext2_ext_attr_header *)block_buf;
1984 start = (struct ext2_ext_attr_entry *)(header+1);
1985 end = (struct ext2_ext_attr_entry *)(block_buf + blocksize);
1987 return fix_ea_entries(imap, start, end, last_ino);
1990 /* A simple LRU cache to check recently processed blocks. */
1996 #define BLK_IN_CACHE(b,c) ((b) == (c).blks[0] || (b) == (c).blks[1] || \
1997 (b) == (c).blks[2] || (b) == (c).blks[3])
1998 #define BLK_ADD_CACHE(b,c) { \
1999 (c).blks[(c).cursor] = (b); \
2000 (c).cursor = ((c).cursor + 1) % 4; \
2003 static errcode_t fix_ea_inode_refs(ext2_resize_t rfs, struct ext2_inode *inode,
2004 char *block_buf, ext2_ino_t last_ino)
2006 ext2_filsys fs = rfs->new_fs;
2007 ext2_inode_scan scan = NULL;
2009 int inode_size = EXT2_INODE_SIZE(fs->super);
2012 struct blk_cache blk_cache;
2013 struct ext2_ext_attr_header *header;
2016 memset(&blk_cache, 0, sizeof(blk_cache));
2018 header = (struct ext2_ext_attr_header *)block_buf;
2020 retval = ext2fs_open_inode_scan(fs, 0, &scan);
2025 retval = ext2fs_get_next_inode_full(scan, &ino, inode,
2032 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2033 continue; /* inode not in use */
2035 if (inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
2036 modified = fix_ea_ibody_entries(rfs->imap,
2037 (struct ext2_inode_large *)inode,
2038 inode_size, last_ino);
2040 retval = ext2fs_write_inode_full(fs, ino, inode,
2047 blk = ext2fs_file_acl_block(fs, inode);
2048 if (blk && !BLK_IN_CACHE(blk, blk_cache)) {
2049 retval = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
2053 modified = fix_ea_block_entries(rfs->imap, block_buf,
2057 retval = ext2fs_write_ext_attr3(fs, blk,
2062 * If refcount is greater than 1, we might see
2063 * the same block referenced by other inodes
2066 if (header->h_refcount > 1)
2067 BLK_ADD_CACHE(blk, blk_cache);
2074 ext2fs_close_inode_scan(scan);
2078 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
2080 struct process_block_struct pb;
2081 ext2_ino_t ino, new_inode;
2082 struct ext2_inode *inode = NULL;
2083 ext2_inode_scan scan = NULL;
2085 char *block_buf = 0;
2086 ext2_ino_t start_to_move;
2088 int update_ea_inode_refs = 0;
2090 if ((rfs->old_fs->group_desc_count <=
2091 rfs->new_fs->group_desc_count) &&
2095 set_com_err_hook(quiet_com_err_proc);
2097 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
2098 if (retval) goto errout;
2100 retval = ext2fs_init_dblist(rfs->old_fs, 0);
2101 if (retval) goto errout;
2102 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
2103 if (retval) goto errout;
2105 start_to_move = (rfs->new_fs->group_desc_count *
2106 rfs->new_fs->super->s_inodes_per_group);
2108 if (rfs->progress) {
2109 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
2110 0, rfs->old_fs->group_desc_count);
2114 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
2118 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
2119 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
2120 inode = malloc(inode_size);
2126 * First, copy all of the inodes that need to be moved
2127 * elsewhere in the inode table
2130 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
2131 if (retval) goto errout;
2135 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2136 continue; /* inode not in use */
2138 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
2141 /* Remap EA block */
2142 retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
2147 if (ino <= start_to_move)
2148 goto remap_blocks; /* Don't need to move inode. */
2151 * Find a new inode. Now that extents and directory blocks
2152 * are tied to the inode number through the checksum, we must
2153 * set up the new inode before we start rewriting blocks.
2155 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
2159 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
2162 * i_ctime field in xattr inodes contain a portion of the ref
2163 * count, do not overwrite.
2165 if (inode->i_flags & EXT4_EA_INODE_FL)
2166 update_ea_inode_refs = 1;
2168 inode->i_ctime = time(0);
2170 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
2176 #ifdef RESIZE2FS_DEBUG
2177 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
2178 printf("Inode moved %u->%u\n", ino, new_inode);
2181 retval = ext2fs_create_extent_table(&rfs->imap, 0);
2185 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
2189 retval = ext2fs_write_inode_full(rfs->old_fs,
2196 * Update inodes to point to new blocks; schedule directory
2197 * blocks for inode remapping. Need to write out dir blocks
2198 * with new inode numbers if we have metadata_csum enabled.
2200 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2201 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
2202 (rfs->bmap || pb.is_dir)) {
2205 pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
2206 retval = ext2fs_block_iterate3(rfs->old_fs,
2207 new_inode, 0, block_buf,
2208 process_block, &pb);
2215 } else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
2216 (rfs->bmap || pb.is_dir)) {
2217 /* inline data dir; update it too */
2218 retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
2224 /* Fix up extent block checksums with the new inode number */
2225 if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
2226 (inode->i_flags & EXT4_EXTENTS_FL)) {
2227 retval = ext2fs_fix_extents_checksums(rfs->old_fs,
2234 if (update_ea_inode_refs &&
2235 ext2fs_has_feature_ea_inode(rfs->new_fs->super)) {
2236 retval = fix_ea_inode_refs(rfs, inode, block_buf,
2241 io_channel_flush(rfs->old_fs->io);
2244 reset_com_err_hook();
2245 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2247 ext2fs_free_extent_table(rfs->bmap);
2251 ext2fs_close_inode_scan(scan);
2253 ext2fs_free_mem(&block_buf);
2258 /* --------------------------------------------------------------------
2260 * Resize processing, phase 4.
2262 * --------------------------------------------------------------------
2268 unsigned int max_dirs;
2272 static int check_and_change_inodes(ext2_ino_t dir,
2273 int entry EXT2FS_ATTR((unused)),
2274 struct ext2_dir_entry *dirent, int offset,
2275 int blocksize EXT2FS_ATTR((unused)),
2276 char *buf EXT2FS_ATTR((unused)),
2279 struct istruct *is = (struct istruct *) priv_data;
2280 struct ext2_inode inode;
2281 ext2_ino_t new_inode;
2285 if (is->rfs->progress && offset == 0) {
2286 io_channel_flush(is->rfs->old_fs->io);
2287 is->err = (is->rfs->progress)(is->rfs,
2288 E2_RSZ_INODE_REF_UPD_PASS,
2289 ++is->num, is->max_dirs);
2291 return DIRENT_ABORT;
2295 * If we have checksums enabled and the inode wasn't present in the
2296 * old fs, then we must rewrite all dir blocks with new checksums.
2298 if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
2299 !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
2300 ret |= DIRENT_CHANGED;
2305 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
2309 #ifdef RESIZE2FS_DEBUG
2310 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
2311 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2312 dir, ext2fs_dirent_name_len(dirent), dirent->name,
2313 dirent->inode, new_inode);
2316 dirent->inode = new_inode;
2318 /* Update the directory mtime and ctime */
2319 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
2321 inode.i_mtime = inode.i_ctime = time(0);
2322 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
2324 return ret | DIRENT_ABORT;
2327 return ret | DIRENT_CHANGED;
2330 static errcode_t inode_ref_fix(ext2_resize_t rfs)
2339 * Now, we iterate over all of the directories to update the
2343 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
2347 if (rfs->progress) {
2348 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2354 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2355 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
2356 DIRENT_FLAG_INCLUDE_EMPTY, 0,
2357 check_and_change_inodes, &is);
2358 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2366 if (rfs->progress && (is.num < is.max_dirs))
2367 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2368 is.max_dirs, is.max_dirs);
2371 ext2fs_free_extent_table(rfs->imap);
2377 /* --------------------------------------------------------------------
2379 * Resize processing, phase 5.
2381 * In this phase we actually move the inode table around, and then
2382 * update the summary statistics. This is scary, since aborting here
2383 * will potentially scramble the filesystem. (We are moving the
2384 * inode tables around in place, and so the potential for lost data,
2385 * or at the very least scrambling the mapping between filenames and
2386 * inode numbers is very high in case of a power failure here.)
2387 * --------------------------------------------------------------------
2392 * A very scary routine --- this one moves the inode table around!!!
2394 * After this you have to use the rfs->new_fs file handle to read and
2397 static errcode_t move_itables(ext2_resize_t rfs)
2401 dgrp_t i, max_groups;
2402 ext2_filsys fs = rfs->new_fs;
2404 blk64_t old_blk, new_blk, blk, cluster_freed;
2408 ext2fs_block_bitmap new_bmap = NULL;
2410 max_groups = fs->group_desc_count;
2411 if (max_groups > rfs->old_fs->group_desc_count)
2412 max_groups = rfs->old_fs->group_desc_count;
2414 size = fs->blocksize * fs->inode_blocks_per_group;
2415 if (!rfs->itable_buf) {
2416 retval = ext2fs_get_mem(size, &rfs->itable_buf);
2421 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
2422 retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
2427 retval = mark_table_blocks(fs, new_bmap);
2433 * Figure out how many inode tables we need to move
2435 to_move = moved = 0;
2436 for (i=0; i < max_groups; i++)
2437 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
2438 ext2fs_inode_table_loc(fs, i))
2446 if (rfs->progress) {
2447 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2453 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
2455 for (i=0; i < max_groups; i++) {
2456 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
2457 new_blk = ext2fs_inode_table_loc(fs, i);
2458 diff = new_blk - old_blk;
2460 #ifdef RESIZE2FS_DEBUG
2461 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2462 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2463 i, old_blk, new_blk, diff);
2471 retval = io_channel_read_blk64(fs->io, old_blk,
2472 fs->inode_blocks_per_group,
2477 * The end of the inode table segment often contains
2478 * all zeros, and we're often only moving the inode
2479 * table down a block or two. If so, we can optimize
2480 * things by not rewriting blocks that we know to be zero
2483 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
2486 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
2487 #ifdef RESIZE2FS_DEBUG
2488 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2489 printf("%d blocks of zeros...\n", n);
2491 num = fs->inode_blocks_per_group;
2495 retval = io_channel_write_blk64(fs->io, new_blk,
2496 num, rfs->itable_buf);
2498 io_channel_write_blk64(fs->io, old_blk,
2499 num, rfs->itable_buf);
2503 retval = io_channel_write_blk64(fs->io,
2504 old_blk + fs->inode_blocks_per_group,
2505 diff, (rfs->itable_buf +
2506 (fs->inode_blocks_per_group - diff) *
2512 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
2513 j < fs->inode_blocks_per_group;) {
2514 if (new_bmap == NULL ||
2515 !ext2fs_test_block_bitmap2(new_bmap, blk)) {
2516 ext2fs_block_alloc_stats2(fs, blk, -1);
2517 cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
2518 (blk & EXT2FS_CLUSTER_MASK(fs));
2519 blk += cluster_freed;
2527 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
2528 ext2fs_group_desc_csum_set(rfs->old_fs, i);
2529 ext2fs_mark_super_dirty(rfs->old_fs);
2530 ext2fs_flush(rfs->old_fs);
2532 if (rfs->progress) {
2533 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2539 mark_table_blocks(fs, fs->block_map);
2541 #ifdef RESIZE2FS_DEBUG
2542 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2543 printf("Inode table move finished.\n");
2549 ext2fs_free_block_bitmap(new_bmap);
2554 * This function is used when expanding a file system. It frees the
2555 * superblock and block group descriptor blocks from the block group
2556 * which is no longer the last block group.
2558 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
2560 ext2_filsys fs = rfs->new_fs;
2561 ext2_filsys old_fs = rfs->old_fs;
2563 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2564 dgrp_t last_bg = fs->group_desc_count - 1;
2565 blk64_t sb, old_desc;
2568 if (!ext2fs_has_feature_sparse_super2(fs->super))
2571 if (last_bg <= old_last_bg)
2574 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2575 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2578 if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
2579 old_fs->super->s_backup_bgs[1] != old_last_bg)
2582 if (fs->super->s_backup_bgs[0] == old_last_bg ||
2583 fs->super->s_backup_bgs[1] == old_last_bg)
2586 if (old_last_bg == 0)
2589 retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
2590 &sb, &old_desc, NULL, &num);
2595 ext2fs_unmark_block_bitmap2(fs->block_map, sb);
2597 ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
2602 * This function is used when shrinking a file system. We need to
2603 * utilize blocks from what will be the new last block group for the
2604 * backup superblock and block group descriptor blocks.
2605 * Unfortunately, those blocks may be used by other files or fs
2606 * metadata blocks. We need to mark them as being in use.
2608 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
2609 ext2fs_block_bitmap meta_bmap)
2611 ext2_filsys fs = rfs->new_fs;
2612 ext2_filsys old_fs = rfs->old_fs;
2614 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2615 dgrp_t last_bg = fs->group_desc_count - 1;
2617 blk64_t blk, sb, old_desc;
2621 if (!ext2fs_has_feature_sparse_super2(fs->super))
2624 if (last_bg >= old_last_bg)
2627 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2628 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2631 if (fs->super->s_backup_bgs[0] != last_bg &&
2632 fs->super->s_backup_bgs[1] != last_bg)
2635 if (old_fs->super->s_backup_bgs[0] == last_bg ||
2636 old_fs->super->s_backup_bgs[1] == last_bg)
2639 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
2640 &sb, &old_desc, NULL, &num);
2644 if (last_bg && !sb) {
2645 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2649 if (old_desc && old_desc != sb+1) {
2650 fputs(_("Should never happen! Unexpected old_desc in "
2651 "super_sparse bg?\n"),
2655 num = (old_desc) ? num : 1;
2657 /* Reserve the backup blocks */
2658 ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
2660 for (g = 0; g < fs->group_desc_count; g++) {
2663 mb = ext2fs_block_bitmap_loc(fs, g);
2664 if ((mb >= sb) && (mb < sb + num)) {
2665 ext2fs_block_bitmap_loc_set(fs, g, 0);
2668 mb = ext2fs_inode_bitmap_loc(fs, g);
2669 if ((mb >= sb) && (mb < sb + num)) {
2670 ext2fs_inode_bitmap_loc_set(fs, g, 0);
2673 mb = ext2fs_inode_table_loc(fs, g);
2674 if ((mb < sb + num) &&
2675 (sb < mb + fs->inode_blocks_per_group)) {
2676 ext2fs_inode_table_loc_set(fs, g, 0);
2680 retval = ext2fs_allocate_group_table(fs, g, 0);
2686 for (blk = sb, i = 0; i < num; blk++, i++) {
2687 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
2688 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
2689 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
2690 rfs->needed_blocks++;
2692 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
2698 * Fix the resize inode
2700 static errcode_t fix_resize_inode(ext2_filsys fs)
2702 struct ext2_inode inode;
2705 if (!ext2fs_has_feature_resize_inode(fs->super))
2708 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
2709 if (retval) goto errout;
2711 ext2fs_iblk_set(fs, &inode, 1);
2713 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
2714 if (retval) goto errout;
2716 if (!inode.i_block[EXT2_DIND_BLOCK]) {
2718 * Avoid zeroing out block #0; that's rude. This
2719 * should never happen anyway since the filesystem
2720 * should be fsck'ed and we assume it is consistent.
2722 fprintf(stderr, "%s",
2723 _("Should never happen: resize inode corrupt!\n"));
2727 retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
2732 retval = ext2fs_create_resize_inode(fs);
2741 * Finally, recalculate the summary information
2743 static errcode_t resize2fs_calculate_summary_stats(ext2_filsys fs)
2747 unsigned int group = 0;
2748 unsigned int count = 0;
2749 blk64_t total_blocks_free = 0;
2750 int total_inodes_free = 0;
2753 blk64_t super_blk, old_desc_blk, new_desc_blk;
2754 int old_desc_blocks;
2757 * First calculate the block statistics
2759 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2760 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
2762 if (ext2fs_has_feature_meta_bg(fs->super))
2763 old_desc_blocks = fs->super->s_first_meta_bg;
2765 old_desc_blocks = fs->desc_blocks +
2766 fs->super->s_reserved_gdt_blocks;
2767 for (blk = B2C(fs->super->s_first_data_block);
2768 blk < ext2fs_blocks_count(fs->super);
2769 blk += EXT2FS_CLUSTER_RATIO(fs)) {
2771 !(EQ_CLSTR(blk, super_blk) ||
2772 ((old_desc_blk && old_desc_blocks &&
2773 GE_CLSTR(blk, old_desc_blk) &&
2774 LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
2775 ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
2776 EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
2777 EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
2778 ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
2779 LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
2780 + fs->inode_blocks_per_group))))) ||
2781 (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
2783 total_blocks_free++;
2786 if ((count == fs->super->s_clusters_per_group) ||
2787 EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
2788 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
2789 ext2fs_group_desc_csum_set(fs, group);
2791 if (group >= fs->group_desc_count)
2795 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2796 ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
2799 if (ext2fs_has_feature_meta_bg(fs->super))
2800 old_desc_blocks = fs->super->s_first_meta_bg;
2802 old_desc_blocks = fs->desc_blocks +
2803 fs->super->s_reserved_gdt_blocks;
2806 total_blocks_free = C2B(total_blocks_free);
2807 ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
2810 * Next, calculate the inode statistics
2816 /* Protect loop from wrap-around if s_inodes_count maxed */
2817 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2818 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
2820 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
2822 total_inodes_free++;
2825 if ((count == fs->super->s_inodes_per_group) ||
2826 (ino == fs->super->s_inodes_count)) {
2827 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
2828 ext2fs_group_desc_csum_set(fs, group);
2830 if (group >= fs->group_desc_count)
2834 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2837 fs->super->s_free_inodes_count = total_inodes_free;
2838 ext2fs_mark_super_dirty(fs);
2843 * Journal may have been relocated; update the backup journal blocks
2844 * in the superblock.
2846 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
2849 struct ext2_inode inode;
2851 if (!ext2fs_has_feature_journal(fs->super))
2854 /* External journal? Nothing to do. */
2855 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2858 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2861 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2862 fs->super->s_jnl_blocks[15] = inode.i_size_high;
2863 fs->super->s_jnl_blocks[16] = inode.i_size;
2864 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2865 ext2fs_mark_super_dirty(fs);
2869 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2870 int old_desc_blocks)
2872 blk64_t super_blk, old_desc_blk, new_desc_blk;
2875 /* inode table blocks plus allocation bitmaps */
2876 overhead = fs->inode_blocks_per_group + 2;
2878 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2879 &old_desc_blk, &new_desc_blk, 0);
2880 if ((grp == 0) || super_blk)
2883 overhead += old_desc_blocks;
2884 else if (new_desc_blk)
2891 * calculate the minimum number of blocks the given fs can be resized to
2893 blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
2895 ext2_ino_t inode_count;
2896 dgrp_t groups, flex_groups;
2897 blk64_t blks_needed, data_blocks;
2898 blk64_t grp, data_needed, last_start;
2899 blk64_t overhead = 0;
2900 int old_desc_blocks;
2901 int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2904 * first figure out how many group descriptors we need to
2905 * handle the number of inodes we have
2907 inode_count = fs->super->s_inodes_count -
2908 fs->super->s_free_inodes_count;
2909 blks_needed = ext2fs_div_ceil(inode_count,
2910 fs->super->s_inodes_per_group) *
2911 (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
2912 groups = ext2fs_div64_ceil(blks_needed,
2913 EXT2_BLOCKS_PER_GROUP(fs->super));
2914 #ifdef RESIZE2FS_DEBUG
2915 if (flags & RESIZE_DEBUG_MIN_CALC)
2916 printf("fs has %d inodes, %d groups required.\n",
2917 inode_count, groups);
2921 * number of old-style block group descriptor blocks
2923 if (ext2fs_has_feature_meta_bg(fs->super))
2924 old_desc_blocks = fs->super->s_first_meta_bg;
2926 old_desc_blocks = fs->desc_blocks +
2927 fs->super->s_reserved_gdt_blocks;
2929 /* calculate how many blocks are needed for data */
2930 data_needed = ext2fs_blocks_count(fs->super);
2931 for (grp = 0; grp < fs->group_desc_count; grp++) {
2932 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
2933 data_needed -= ext2fs_bg_free_blocks_count(fs, grp);
2935 #ifdef RESIZE2FS_DEBUG
2936 if (flags & RESIZE_DEBUG_MIN_CALC)
2937 printf("fs requires %llu data blocks.\n", data_needed);
2941 * For ext4 we need to allow for up to a flex_bg worth of
2942 * inode tables of slack space so the resize operation can be
2943 * guaranteed to finish.
2945 flex_groups = groups;
2946 if (ext2fs_has_feature_flex_bg(fs->super)) {
2947 dgrp_t remainder = groups & (flexbg_size - 1);
2949 flex_groups += flexbg_size - remainder;
2950 if (flex_groups > fs->group_desc_count)
2951 flex_groups = fs->group_desc_count;
2955 * figure out how many data blocks we have given the number of groups
2956 * we need for our inodes
2958 data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
2960 for (grp = 0; grp < flex_groups; grp++) {
2961 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
2964 * we want to keep track of how much data we can store in
2965 * the groups leading up to the last group so we can determine
2966 * how big the last group needs to be
2968 if (grp < (groups - 1))
2969 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
2972 if (data_blocks > overhead)
2973 data_blocks -= overhead;
2977 #ifdef RESIZE2FS_DEBUG
2978 if (flags & RESIZE_DEBUG_MIN_CALC)
2979 printf("With %d group(s), we have %llu blocks available.\n",
2980 groups, data_blocks);
2984 * if we need more group descriptors in order to accommodate our data
2985 * then we need to add them here
2987 blks_needed = data_needed;
2988 while (blks_needed > data_blocks) {
2989 blk64_t remainder = blks_needed - data_blocks;
2992 /* figure out how many more groups we need for the data */
2993 extra_grps = ext2fs_div64_ceil(remainder,
2994 EXT2_BLOCKS_PER_GROUP(fs->super));
2996 data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
2998 /* ok we have to account for the last group */
2999 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
3000 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
3003 groups += extra_grps;
3004 if (!ext2fs_has_feature_flex_bg(fs->super))
3005 flex_groups = groups;
3006 else if (groups > flex_groups) {
3007 dgrp_t r = groups & (flexbg_size - 1);
3009 flex_groups = groups + flexbg_size - r;
3010 if (flex_groups > fs->group_desc_count)
3011 flex_groups = fs->group_desc_count;
3014 for (; grp < flex_groups; grp++) {
3015 overhead = calc_group_overhead(fs, grp,
3019 * again, we need to see how much data we cram into
3020 * all of the groups leading up to the last group
3022 if (grp < groups - 1)
3023 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
3026 data_blocks -= overhead;
3029 #ifdef RESIZE2FS_DEBUG
3030 if (flags & RESIZE_DEBUG_MIN_CALC)
3031 printf("Added %d extra group(s), "
3032 "blks_needed %llu, data_blocks %llu, "
3033 "last_start %llu\n", extra_grps, blks_needed,
3034 data_blocks, last_start);
3038 /* now for the fun voodoo */
3040 if (ext2fs_has_feature_flex_bg(fs->super) &&
3041 (grp & ~(flexbg_size - 1)) == 0)
3042 grp = grp & ~(flexbg_size - 1);
3044 for (; grp < flex_groups; grp++)
3045 overhead += calc_group_overhead(fs, grp, old_desc_blocks);
3047 #ifdef RESIZE2FS_DEBUG
3048 if (flags & RESIZE_DEBUG_MIN_CALC)
3049 printf("Last group's overhead is %llu\n", overhead);
3053 * if this is the case then the last group is going to have data in it
3054 * so we need to adjust the size of the last group accordingly
3056 if (last_start < blks_needed) {
3057 blk64_t remainder = blks_needed - last_start;
3059 #ifdef RESIZE2FS_DEBUG
3060 if (flags & RESIZE_DEBUG_MIN_CALC)
3061 printf("Need %llu data blocks in last group\n",
3065 * 50 is a magic number that mkfs/resize uses to see if its
3066 * even worth making/resizing the fs. basically you need to
3067 * have at least 50 blocks in addition to the blocks needed
3068 * for the metadata in the last group
3071 overhead += remainder;
3077 overhead += fs->super->s_first_data_block;
3078 #ifdef RESIZE2FS_DEBUG
3079 if (flags & RESIZE_DEBUG_MIN_CALC)
3080 printf("Final size of last group is %lld\n", overhead);
3083 /* Add extra slack for bigalloc file systems */
3084 if (EXT2FS_CLUSTER_RATIO(fs) > 1)
3085 overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
3088 * since our last group doesn't have to be BLOCKS_PER_GROUP
3089 * large, we only do groups-1, and then add the number of
3090 * blocks needed to handle the group descriptor metadata+data
3093 blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
3094 blks_needed += overhead;
3097 * Make sure blks_needed covers the end of the inode table in
3098 * the last block group.
3100 overhead = ext2fs_inode_table_loc(fs, groups-1) +
3101 fs->inode_blocks_per_group;
3102 if (blks_needed < overhead)
3103 blks_needed = overhead;
3105 #ifdef RESIZE2FS_DEBUG
3106 if (flags & RESIZE_DEBUG_MIN_CALC)
3107 printf("Estimated blocks needed: %llu\n", blks_needed);
3111 * If at this point we've already added up more "needed" than
3112 * the current size, just return current size as minimum.
3114 if (blks_needed >= ext2fs_blocks_count(fs->super))
3115 return ext2fs_blocks_count(fs->super);
3117 * We need to reserve a few extra blocks if extents are
3118 * enabled, in case we need to grow the extent tree. The more
3119 * we shrink the file system, the more space we need.
3121 * The absolute worst case is every single data block is in
3122 * the part of the file system that needs to be evacuated,
3123 * with each data block needs to be in its own extent, and
3124 * with each inode needing at least one extent block.
3126 if (ext2fs_has_feature_extents(fs->super)) {
3127 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
3129 unsigned int exts_per_blk = (fs->blocksize /
3130 sizeof(struct ext3_extent)) - 1;
3131 blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
3134 if (worst_case < inode_count)
3135 worst_case = inode_count;
3137 if (safe_margin > worst_case)
3138 safe_margin = worst_case;
3140 #ifdef RESIZE2FS_DEBUG
3141 if (flags & RESIZE_DEBUG_MIN_CALC)
3142 printf("Extents safety margin: %llu\n", safe_margin);
3144 blks_needed += safe_margin;