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 (unsigned long long) ext2fs_free_blocks_count(rfs->old_fs->super),
181 (unsigned long long) ext2fs_free_blocks_count(rfs->new_fs->super),
182 (unsigned long long) rfs->needed_blocks);
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 new_inodes = (unsigned long long) fs->super->s_inodes_per_group * (fs->group_desc_count - 1);
761 if (new_inodes <= ~0U) {
762 unsigned long long new_blocks =
763 ((unsigned long long) fs->super->s_blocks_per_group *
764 (fs->group_desc_count - 1)) + fs->super->s_first_data_block;
766 ext2fs_blocks_count_set(fs->super, new_blocks);
769 fprintf(stderr, _("inodes (%llu) must be less than %u\n"),
770 (unsigned long long) new_inodes, ~0U);
771 return EXT2_ET_TOO_MANY_INODES;
773 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
774 fs->group_desc_count;
777 * Adjust the number of free blocks
779 blk = ext2fs_blocks_count(old_fs->super);
780 if (blk > ext2fs_blocks_count(fs->super))
781 ext2fs_free_blocks_count_set(fs->super,
782 ext2fs_free_blocks_count(fs->super) -
783 (blk - ext2fs_blocks_count(fs->super)));
785 ext2fs_free_blocks_count_set(fs->super,
786 ext2fs_free_blocks_count(fs->super) +
787 (ext2fs_blocks_count(fs->super) - blk));
790 * Adjust the number of reserved blocks
792 percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
793 ext2fs_blocks_count(old_fs->super);
794 ext2fs_r_blocks_count_set(fs->super,
795 (percent * ext2fs_blocks_count(fs->super) /
799 * Adjust the bitmaps for size
801 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
802 fs->super->s_inodes_count,
804 if (retval) goto errout;
806 real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
807 fs->super->s_first_data_block;
808 retval = ext2fs_resize_block_bitmap2(new_size - 1,
809 real_end, fs->block_map);
810 if (retval) goto errout;
813 * If we are growing the file system, also grow the size of
814 * the reserve_blocks bitmap
816 if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
817 retval = ext2fs_resize_block_bitmap2(new_size - 1,
818 real_end, reserve_blocks);
819 if (retval) goto errout;
823 * Reallocate the group descriptors as necessary.
825 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
826 old_fs->desc_blocks != fs->desc_blocks) {
827 retval = ext2fs_resize_mem(old_fs->desc_blocks *
829 fs->desc_blocks * fs->blocksize,
833 if (fs->desc_blocks > old_fs->desc_blocks)
834 memset((char *) fs->group_desc +
835 (old_fs->desc_blocks * fs->blocksize), 0,
836 (fs->desc_blocks - old_fs->desc_blocks) *
841 * If the resize_inode feature is set, and we are changing the
842 * number of descriptor blocks, then adjust
843 * s_reserved_gdt_blocks if possible to avoid needing to move
844 * the inode table either now or in the future.
846 * Note: If we're converting to 64bit mode, we did this earlier.
848 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
849 adjust_reserved_gdt_blocks(old_fs, fs);
851 if (ext2fs_has_feature_meta_bg(fs->super) &&
852 (fs->super->s_first_meta_bg > fs->desc_blocks)) {
853 ext2fs_clear_feature_meta_bg(fs->super);
854 fs->super->s_first_meta_bg = 0;
858 * Update the location of the backup superblocks if the
859 * sparse_super2 feature is enabled.
861 if (ext2fs_has_feature_sparse_super2(fs->super)) {
862 dgrp_t last_bg = fs->group_desc_count - 1;
863 dgrp_t old_last_bg = old_fs->group_desc_count - 1;
865 if (last_bg > old_last_bg) {
866 if (old_fs->group_desc_count == 1)
867 fs->super->s_backup_bgs[0] = 1;
868 if ((old_fs->group_desc_count < 3 &&
869 fs->group_desc_count > 2) ||
870 fs->super->s_backup_bgs[1])
871 fs->super->s_backup_bgs[1] = last_bg;
872 } else if (last_bg < old_last_bg) {
873 if (fs->super->s_backup_bgs[0] > last_bg)
874 fs->super->s_backup_bgs[0] = 0;
875 if (fs->super->s_backup_bgs[1] > last_bg)
876 fs->super->s_backup_bgs[1] = 0;
878 old_fs->super->s_backup_bgs[1] == old_last_bg)
879 fs->super->s_backup_bgs[1] = last_bg;
884 * If we are shrinking the number of block groups, we're done
887 if (old_fs->group_desc_count > fs->group_desc_count) {
889 * Check the block groups that we are chopping off
890 * and free any blocks associated with their metadata
892 retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
893 fs->group_desc_count);
898 * Fix the count of the last (old) block group
900 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
901 old_fs->super->s_first_data_block) %
902 old_fs->super->s_blocks_per_group;
904 old_numblocks = old_fs->super->s_blocks_per_group;
905 if (old_fs->group_desc_count == fs->group_desc_count) {
906 numblocks = (ext2fs_blocks_count(fs->super) -
907 fs->super->s_first_data_block) %
908 fs->super->s_blocks_per_group;
910 numblocks = fs->super->s_blocks_per_group;
912 numblocks = fs->super->s_blocks_per_group;
913 i = old_fs->group_desc_count - 1;
914 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
915 ext2fs_group_desc_csum_set(fs, i);
918 * If the number of block groups is staying the same, we're
919 * done and can exit now. (If the number block groups is
920 * shrinking, we had exited earlier.)
922 if (old_fs->group_desc_count >= fs->group_desc_count) {
928 * Initialize the new block group descriptors
930 group_block = ext2fs_group_first_block2(fs,
931 old_fs->group_desc_count);
932 csum_flag = ext2fs_has_group_desc_csum(fs);
933 if (getenv("RESIZE2FS_FORCE_LAZY_ITABLE_INIT") ||
934 (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
935 access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0))
936 lazy_itable_init = 1;
937 if (ext2fs_has_feature_meta_bg(fs->super))
938 old_desc_blocks = fs->super->s_first_meta_bg;
940 old_desc_blocks = fs->desc_blocks +
941 fs->super->s_reserved_gdt_blocks;
944 * If we changed the number of block_group descriptor blocks,
945 * we need to make sure they are all marked as reserved in the
946 * filesystem's block allocation map.
948 for (i = 0; i < old_fs->group_desc_count; i++)
949 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
951 for (i = old_fs->group_desc_count;
952 i < fs->group_desc_count; i++) {
953 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
954 sizeof(struct ext2_group_desc));
957 ext2fs_bg_flags_zap(fs, i);
959 ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
960 if (!lazy_itable_init)
961 ext2fs_bg_flags_set(fs, i,
962 EXT2_BG_INODE_ZEROED);
963 ext2fs_bg_itable_unused_set(fs, i,
964 fs->super->s_inodes_per_group);
967 numblocks = ext2fs_group_blocks_count(fs, i);
968 if ((i < fs->group_desc_count - 1) && csum_flag)
969 ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
971 has_super = ext2fs_bg_has_super(fs, i);
973 ext2fs_block_alloc_stats2(fs, group_block, +1);
976 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
977 meta_bg = i / meta_bg_size;
978 if (!ext2fs_has_feature_meta_bg(fs->super) ||
979 (meta_bg < fs->super->s_first_meta_bg)) {
981 for (j=0; j < old_desc_blocks; j++)
982 ext2fs_block_alloc_stats2(fs,
983 group_block + 1 + j, +1);
984 adjblocks += old_desc_blocks;
989 if (((i % meta_bg_size) == 0) ||
990 ((i % meta_bg_size) == 1) ||
991 ((i % meta_bg_size) == (meta_bg_size-1)))
992 ext2fs_block_alloc_stats2(fs,
993 group_block + has_super, +1);
996 adjblocks += 2 + fs->inode_blocks_per_group;
998 numblocks -= adjblocks;
999 ext2fs_free_blocks_count_set(fs->super,
1000 ext2fs_free_blocks_count(fs->super) - adjblocks);
1001 fs->super->s_free_inodes_count +=
1002 fs->super->s_inodes_per_group;
1003 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
1004 ext2fs_bg_free_inodes_count_set(fs, i,
1005 fs->super->s_inodes_per_group);
1006 ext2fs_bg_used_dirs_count_set(fs, i, 0);
1007 ext2fs_group_desc_csum_set(fs, i);
1009 retval = ext2fs_allocate_group_table(fs, i, 0);
1010 if (retval) goto errout;
1012 group_block += fs->super->s_blocks_per_group;
1017 * Mark all of the metadata blocks as reserved so they won't
1018 * get allocated by the call to ext2fs_allocate_group_table()
1019 * in blocks_to_move(), where we allocate new blocks to
1020 * replace those allocation bitmap and inode table blocks
1021 * which have to get relocated to make space for an increased
1022 * number of the block group descriptors.
1025 mark_table_blocks(fs, reserve_blocks);
1032 * Replicate the first part of adjust_fs_info to determine what the
1033 * new size of the file system should be. This allows resize2fs to
1034 * exit early if we aren't going to make any changes to the file
1037 void adjust_new_size(ext2_filsys fs, blk64_t *sizep)
1039 blk64_t size, rem, overhead = 0;
1040 unsigned long desc_blocks;
1041 dgrp_t group_desc_count;
1043 unsigned long long new_inodes; /* u64 to check for overflow */
1047 group_desc_count = ext2fs_div64_ceil(size -
1048 fs->super->s_first_data_block,
1049 EXT2_BLOCKS_PER_GROUP(fs->super));
1050 if (group_desc_count == 0)
1052 desc_blocks = ext2fs_div_ceil(group_desc_count,
1053 EXT2_DESC_PER_BLOCK(fs->super));
1056 * Overhead is the number of bookkeeping blocks per group. It
1057 * includes the superblock backup, the group descriptor
1058 * backups, the inode bitmap, the block bitmap, and the inode
1061 overhead = (int) (2 + fs->inode_blocks_per_group);
1064 if (ext2fs_has_feature_sparse_super2(fs->super)) {
1066 * We have to do this manually since
1067 * super->s_backup_bgs hasn't been set up yet.
1069 if (group_desc_count == 2)
1070 has_bg = fs->super->s_backup_bgs[0] != 0;
1072 has_bg = fs->super->s_backup_bgs[1] != 0;
1074 has_bg = ext2fs_bg_has_super(fs, group_desc_count - 1);
1076 overhead += 1 + desc_blocks +
1077 fs->super->s_reserved_gdt_blocks;
1080 * See if the last group is big enough to support the
1081 * necessary data structures. If not, we need to get rid of
1084 rem = (size - fs->super->s_first_data_block) %
1085 fs->super->s_blocks_per_group;
1086 if ((group_desc_count == 1) && rem && (rem < overhead))
1088 if ((group_desc_count > 1) && rem && (rem < overhead+50)) {
1094 * If we need to reduce the size by no more than a block
1095 * group to avoid overrunning the max inode limit, do it.
1097 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * group_desc_count;
1098 if (new_inodes > ~0U) {
1099 new_inodes = (unsigned long long) fs->super->s_inodes_per_group * (group_desc_count - 1);
1100 if (new_inodes > ~0U)
1102 size = ((unsigned long long) fs->super->s_blocks_per_group *
1103 (group_desc_count - 1)) + fs->super->s_first_data_block;
1111 * This routine adjusts the superblock and other data structures, both
1112 * in disk as well as in memory...
1114 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
1116 ext2_filsys fs = rfs->new_fs;
1120 unsigned long max_group;
1122 ext2fs_mark_super_dirty(fs);
1123 ext2fs_mark_bb_dirty(fs);
1124 ext2fs_mark_ib_dirty(fs);
1126 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
1127 &rfs->reserve_blocks);
1131 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
1136 * Check to make sure there are enough inodes
1138 if ((rfs->old_fs->super->s_inodes_count -
1139 rfs->old_fs->super->s_free_inodes_count) >
1140 rfs->new_fs->super->s_inodes_count) {
1146 * If we are shrinking the number block groups, we're done and
1149 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
1155 * If the number of block groups is staying the same, we're
1156 * done and can exit now. (If the number block groups is
1157 * shrinking, we had exited earlier.)
1159 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
1165 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1166 * supports lazy inode initialization, we can skip
1167 * initializing the inode table.
1169 if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
1175 * Initialize the inode table
1177 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
1182 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
1183 adj = rfs->old_fs->group_desc_count;
1184 max_group = fs->group_desc_count - adj;
1185 if (rfs->progress) {
1186 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1191 for (i = rfs->old_fs->group_desc_count;
1192 i < fs->group_desc_count; i++) {
1194 * Write out the new inode table
1196 retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
1197 fs->inode_blocks_per_group, NULL,
1202 io_channel_flush(fs->io);
1203 if (rfs->progress) {
1204 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1205 i - adj + 1, max_group);
1210 io_channel_flush(fs->io);
1217 /* --------------------------------------------------------------------
1219 * Resize processing, phase 2.
1221 * In this phase we adjust determine which blocks need to be moved, in
1222 * blocks_to_move(). We then copy the blocks to their ultimate new
1223 * destinations using block_mover(). Since we are copying blocks to
1224 * their new locations, again during this pass we can abort without
1226 * --------------------------------------------------------------------
1230 * This helper function creates a block bitmap with all of the
1231 * filesystem meta-data blocks.
1233 static errcode_t mark_table_blocks(ext2_filsys fs,
1234 ext2fs_block_bitmap bmap)
1239 for (i = 0; i < fs->group_desc_count; i++) {
1240 ext2fs_reserve_super_and_bgd(fs, i, bmap);
1243 * Mark the blocks used for the inode table
1245 blk = ext2fs_inode_table_loc(fs, i);
1247 ext2fs_mark_block_bitmap_range2(bmap, blk,
1248 fs->inode_blocks_per_group);
1251 * Mark block used for the block bitmap
1253 blk = ext2fs_block_bitmap_loc(fs, i);
1255 ext2fs_mark_block_bitmap2(bmap, blk);
1258 * Mark block used for the inode bitmap
1260 blk = ext2fs_inode_bitmap_loc(fs, i);
1262 ext2fs_mark_block_bitmap2(bmap, blk);
1264 /* Reserve the MMP block */
1265 if (ext2fs_has_feature_mmp(fs->super) &&
1266 fs->super->s_mmp_block > fs->super->s_first_data_block &&
1267 fs->super->s_mmp_block < ext2fs_blocks_count(fs->super))
1268 ext2fs_mark_block_bitmap2(bmap, fs->super->s_mmp_block);
1273 * This function checks to see if a particular block (either a
1274 * superblock or a block group descriptor) overlaps with an inode or
1275 * block bitmap block, or with the inode table.
1277 static void mark_fs_metablock(ext2_resize_t rfs,
1278 ext2fs_block_bitmap meta_bmap,
1279 int group, blk64_t blk)
1281 ext2_filsys fs = rfs->new_fs;
1283 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1284 ext2fs_block_alloc_stats2(fs, blk, +1);
1287 * Check to see if we overlap with the inode or block bitmap,
1288 * or the inode tables. If not, and the block is in use, then
1289 * mark it as a block to be moved.
1291 if (is_block_bm(fs, group, blk)) {
1292 ext2fs_block_bitmap_loc_set(fs, group, 0);
1293 rfs->needed_blocks++;
1296 if (is_inode_bm(fs, group, blk)) {
1297 ext2fs_inode_bitmap_loc_set(fs, group, 0);
1298 rfs->needed_blocks++;
1301 if (is_inode_tb(fs, group, blk)) {
1302 ext2fs_inode_table_loc_set(fs, group, 0);
1303 rfs->needed_blocks++;
1306 if (ext2fs_has_feature_flex_bg(fs->super)) {
1309 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
1310 if (is_block_bm(fs, i, blk)) {
1311 ext2fs_block_bitmap_loc_set(fs, i, 0);
1312 rfs->needed_blocks++;
1315 if (is_inode_bm(fs, i, blk)) {
1316 ext2fs_inode_bitmap_loc_set(fs, i, 0);
1317 rfs->needed_blocks++;
1320 if (is_inode_tb(fs, i, blk)) {
1321 ext2fs_inode_table_loc_set(fs, i, 0);
1322 rfs->needed_blocks++;
1328 if (ext2fs_has_group_desc_csum(fs) &&
1329 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
1331 * If the block bitmap is uninitialized, which means
1332 * nothing other than standard metadata in use.
1335 } else if (blk < ext2fs_blocks_count(rfs->old_fs->super) &&
1336 ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
1337 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1338 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1339 rfs->needed_blocks++;
1345 * This routine marks and unmarks reserved blocks in the new block
1346 * bitmap. It also determines which blocks need to be moved and
1347 * places this information into the move_blocks bitmap.
1349 static errcode_t blocks_to_move(ext2_resize_t rfs)
1353 dgrp_t i, max_groups, g;
1354 blk64_t blk, group_blk;
1355 blk64_t old_blocks, new_blocks, group_end, cluster_freed;
1357 unsigned int meta_bg, meta_bg_size;
1359 ext2_filsys fs, old_fs;
1360 ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
1364 old_fs = rfs->old_fs;
1365 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
1368 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
1373 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
1378 retval = mark_table_blocks(old_fs, meta_bmap);
1385 * If we're shrinking the filesystem, we need to move any
1386 * group's metadata blocks (either allocation bitmaps or the
1387 * inode table) which are beyond the end of the new
1390 new_size = ext2fs_blocks_count(fs->super);
1391 if (new_size < ext2fs_blocks_count(old_fs->super)) {
1392 for (g = 0; g < fs->group_desc_count; g++) {
1395 * ext2fs_allocate_group_table will re-allocate any
1396 * metadata blocks whose location is set to zero.
1398 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
1399 ext2fs_block_bitmap_loc_set(fs, g, 0);
1402 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
1403 ext2fs_inode_bitmap_loc_set(fs, g, 0);
1406 if ((ext2fs_inode_table_loc(fs, g) +
1407 fs->inode_blocks_per_group) > new_size) {
1408 ext2fs_inode_table_loc_set(fs, g, 0);
1413 retval = ext2fs_allocate_group_table(fs, g, 0);
1421 * If we're shrinking the filesystem, we need to move all of
1422 * the blocks that don't fit any more
1424 for (blk = ext2fs_blocks_count(fs->super);
1425 blk < ext2fs_blocks_count(old_fs->super); blk++) {
1426 g = ext2fs_group_of_blk2(fs, blk);
1427 if (ext2fs_has_group_desc_csum(fs) &&
1428 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
1430 * The block bitmap is uninitialized, so skip
1431 * to the next block group.
1433 blk = ext2fs_group_first_block2(fs, g+1) - 1;
1436 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1437 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1438 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1439 rfs->needed_blocks++;
1441 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1444 if (ext2fs_has_feature_meta_bg(old_fs->super))
1445 old_blocks = old_fs->super->s_first_meta_bg;
1447 old_blocks = old_fs->desc_blocks +
1448 old_fs->super->s_reserved_gdt_blocks;
1449 if (ext2fs_has_feature_meta_bg(fs->super))
1450 new_blocks = fs->super->s_first_meta_bg;
1452 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
1454 retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
1458 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
1459 EXT2_DESC_SIZE(rfs->new_fs->super) &&
1460 old_blocks == new_blocks) {
1465 max_groups = fs->group_desc_count;
1466 if (max_groups > old_fs->group_desc_count)
1467 max_groups = old_fs->group_desc_count;
1468 group_blk = old_fs->super->s_first_data_block;
1470 * If we're reducing the number of descriptor blocks, this
1471 * makes life easy. :-) We just have to mark some extra
1474 if (old_blocks > new_blocks) {
1475 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
1476 retval = ext2fs_allocate_block_bitmap(fs,
1477 _("new meta blocks"),
1482 retval = mark_table_blocks(fs, new_meta_bmap);
1487 for (i = 0; i < max_groups; i++) {
1488 if (!ext2fs_bg_has_super(old_fs, i)) {
1489 group_blk += fs->super->s_blocks_per_group;
1492 group_end = group_blk + 1 + old_blocks;
1493 for (blk = group_blk + 1 + new_blocks;
1495 if (new_meta_bmap == NULL ||
1496 !ext2fs_test_block_bitmap2(new_meta_bmap,
1499 EXT2FS_CLUSTER_RATIO(fs) -
1501 EXT2FS_CLUSTER_MASK(fs));
1502 if (cluster_freed > group_end - blk)
1503 cluster_freed = group_end - blk;
1504 ext2fs_block_alloc_stats2(fs, blk, -1);
1505 blk += EXT2FS_CLUSTER_RATIO(fs);
1506 rfs->needed_blocks -= cluster_freed;
1509 rfs->needed_blocks--;
1512 group_blk += fs->super->s_blocks_per_group;
1518 * If we're increasing the number of descriptor blocks, life
1519 * gets interesting....
1521 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
1522 flex_bg = ext2fs_has_feature_flex_bg(fs->super);
1523 /* first reserve all of the existing fs meta blocks */
1524 for (i = 0; i < max_groups; i++) {
1525 has_super = ext2fs_bg_has_super(fs, i);
1527 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
1529 meta_bg = i / meta_bg_size;
1530 if (!ext2fs_has_feature_meta_bg(fs->super) ||
1531 (meta_bg < fs->super->s_first_meta_bg)) {
1533 for (blk = group_blk+1;
1534 blk < group_blk + 1 + new_blocks; blk++)
1535 mark_fs_metablock(rfs, meta_bmap,
1541 if (((i % meta_bg_size) == 0) ||
1542 ((i % meta_bg_size) == 1) ||
1543 ((i % meta_bg_size) == (meta_bg_size-1)))
1544 mark_fs_metablock(rfs, meta_bmap, i,
1545 group_blk + has_super);
1549 * Reserve the existing meta blocks that we know
1550 * aren't to be moved.
1552 * For flex_bg file systems, in order to avoid
1553 * overwriting fs metadata (especially inode table
1554 * blocks) belonging to a different block group when
1555 * we are relocating the inode tables, we need to
1556 * reserve all existing fs metadata blocks.
1558 if (ext2fs_block_bitmap_loc(fs, i))
1559 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1560 ext2fs_block_bitmap_loc(fs, i));
1561 else if (flex_bg && i < old_fs->group_desc_count)
1562 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1563 ext2fs_block_bitmap_loc(old_fs, i));
1565 if (ext2fs_inode_bitmap_loc(fs, i))
1566 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1567 ext2fs_inode_bitmap_loc(fs, i));
1568 else if (flex_bg && i < old_fs->group_desc_count)
1569 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1570 ext2fs_inode_bitmap_loc(old_fs, i));
1572 if (ext2fs_inode_table_loc(fs, i))
1573 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1574 ext2fs_inode_table_loc(fs, i),
1575 fs->inode_blocks_per_group);
1576 else if (flex_bg && i < old_fs->group_desc_count)
1577 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1578 ext2fs_inode_table_loc(old_fs, i),
1579 old_fs->inode_blocks_per_group);
1581 group_blk += rfs->new_fs->super->s_blocks_per_group;
1584 /* Allocate the missing data structures */
1585 for (i = 0; i < max_groups; i++) {
1586 if (ext2fs_inode_table_loc(fs, i) &&
1587 ext2fs_inode_bitmap_loc(fs, i) &&
1588 ext2fs_block_bitmap_loc(fs, i))
1591 retval = ext2fs_allocate_group_table(fs, i,
1592 rfs->reserve_blocks);
1597 * For those structures that have changed, we need to
1600 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1601 (blk = ext2fs_block_bitmap_loc(fs, i))) {
1602 ext2fs_block_alloc_stats2(fs, blk, +1);
1603 if (blk < ext2fs_blocks_count(old_fs->super) &&
1604 ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1605 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1606 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1609 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1610 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1611 ext2fs_block_alloc_stats2(fs, blk, +1);
1612 if (blk < ext2fs_blocks_count(old_fs->super) &&
1613 ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1614 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1615 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1620 * The inode table, if we need to relocate it, is
1621 * handled specially. We have to reserve the blocks
1622 * for both the old and the new inode table, since we
1623 * can't have the inode table be destroyed during the
1624 * block relocation phase.
1626 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1627 continue; /* inode table not moved */
1629 rfs->needed_blocks += fs->inode_blocks_per_group;
1632 * Mark the new inode table as in use in the new block
1633 * allocation bitmap, and move any blocks that might
1636 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1637 j < fs->inode_blocks_per_group ; j++, blk++) {
1638 ext2fs_block_alloc_stats2(fs, blk, +1);
1639 if (blk < ext2fs_blocks_count(old_fs->super) &&
1640 ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1641 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1642 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1647 * Make sure the old inode table is reserved in the
1648 * block reservation bitmap.
1650 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1651 j < fs->inode_blocks_per_group ; j++, blk++)
1652 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1658 ext2fs_free_block_bitmap(new_meta_bmap);
1660 ext2fs_free_block_bitmap(meta_bmap);
1666 * This helper function tries to allocate a new block. We try to
1667 * avoid hitting the original group descriptor blocks at least at
1668 * first, since we want to make it possible to recover from a badly
1669 * aborted resize operation as much as possible.
1671 * In the future, I may further modify this routine to balance out
1672 * where we get the new blocks across the various block groups.
1673 * Ideally we would allocate blocks that corresponded with the block
1674 * group of the containing inode, and keep contiguous blocks
1675 * together. However, this very difficult to do efficiently, since we
1676 * don't have the necessary information up front.
1680 #define DESPERATION 2
1682 static void init_block_alloc(ext2_resize_t rfs)
1684 rfs->alloc_state = AVOID_OLD;
1685 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1687 /* HACK for testing */
1688 if (ext2fs_blocks_count(rfs->new_fs->super) >
1689 ext2fs_blocks_count(rfs->old_fs->super))
1690 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1694 static blk64_t get_new_block(ext2_resize_t rfs)
1696 ext2_filsys fs = rfs->new_fs;
1699 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1700 if (rfs->alloc_state == DESPERATION)
1703 #ifdef RESIZE2FS_DEBUG
1704 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1705 printf("Going into desperation mode "
1706 "for block allocations\n");
1708 rfs->alloc_state = DESPERATION;
1709 rfs->new_blk = fs->super->s_first_data_block;
1712 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1713 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1715 ((rfs->alloc_state == AVOID_OLD) &&
1716 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1717 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1722 return rfs->new_blk;
1726 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
1727 blk64_t goal EXT2FS_ATTR((unused)),
1730 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1734 blk = get_new_block(rfs);
1738 #ifdef RESIZE2FS_DEBUG
1739 if (rfs->flags & 0xF)
1740 printf("get_alloc_block allocating %llu\n",
1741 (unsigned long long) blk);
1744 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1745 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1747 group = ext2fs_group_of_blk2(rfs->old_fs, blk);
1748 ext2fs_clear_block_uninit(rfs->old_fs, group);
1749 group = ext2fs_group_of_blk2(rfs->new_fs, blk);
1750 ext2fs_clear_block_uninit(rfs->new_fs, group);
1752 *ret = (blk64_t) blk;
1756 static errcode_t block_mover(ext2_resize_t rfs)
1758 blk64_t blk, old_blk, new_blk;
1759 ext2_filsys fs = rfs->new_fs;
1760 ext2_filsys old_fs = rfs->old_fs;
1764 ext2_badblocks_list badblock_list = 0;
1765 int bb_modified = 0;
1767 fs->get_alloc_block = resize2fs_get_alloc_block;
1768 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1770 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1774 new_blk = fs->super->s_first_data_block;
1775 if (!rfs->itable_buf) {
1776 retval = ext2fs_get_array(fs->blocksize,
1777 fs->inode_blocks_per_group,
1782 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1787 * The first step is to figure out where all of the blocks
1790 to_move = moved = 0;
1791 init_block_alloc(rfs);
1792 for (blk = B2C(old_fs->super->s_first_data_block);
1793 blk < ext2fs_blocks_count(old_fs->super);
1794 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1795 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1797 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1799 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1800 ext2fs_badblocks_list_del(badblock_list, blk);
1805 new_blk = get_new_block(rfs);
1810 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1811 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1817 ext2fs_free_extent_table(rfs->bmap);
1825 * Step two is to actually move the blocks
1827 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1828 if (retval) goto errout;
1830 if (rfs->progress) {
1831 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1837 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1838 if (retval) goto errout;
1841 old_blk = C2B(old_blk);
1842 new_blk = C2B(new_blk);
1844 #ifdef RESIZE2FS_DEBUG
1845 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1846 printf("Moving %llu blocks %llu->%llu\n",
1847 (unsigned long long) size,
1848 (unsigned long long) old_blk,
1849 (unsigned long long) new_blk);
1853 if (c > fs->inode_blocks_per_group)
1854 c = fs->inode_blocks_per_group;
1855 retval = io_channel_read_blk64(fs->io, old_blk, c,
1857 if (retval) goto errout;
1858 retval = io_channel_write_blk64(fs->io, new_blk, c,
1860 if (retval) goto errout;
1865 if (rfs->progress) {
1866 retval = (rfs->progress)(rfs,
1867 E2_RSZ_BLOCK_RELOC_PASS,
1875 io_channel_flush(fs->io);
1878 if (badblock_list) {
1879 if (!retval && bb_modified)
1880 retval = ext2fs_update_bb_inode(old_fs,
1882 ext2fs_badblocks_list_free(badblock_list);
1888 /* --------------------------------------------------------------------
1890 * Resize processing, phase 3
1892 * --------------------------------------------------------------------
1897 * The extent translation table is stored in clusters so we need to
1898 * take special care when mapping a source block number to its
1899 * destination block number.
1901 static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1903 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1906 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1910 struct process_block_struct {
1914 struct ext2_inode * inode;
1921 static int process_block(ext2_filsys fs, blk64_t *block_nr,
1922 e2_blkcnt_t blockcnt,
1923 blk64_t ref_block EXT2FS_ATTR((unused)),
1924 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1926 struct process_block_struct *pb;
1928 blk64_t block, new_block;
1931 pb = (struct process_block_struct *) priv_data;
1933 if (pb->rfs->bmap) {
1934 new_block = extent_translate(fs, pb->rfs->bmap, block);
1936 *block_nr = new_block;
1937 ret |= BLOCK_CHANGED;
1939 #ifdef RESIZE2FS_DEBUG
1940 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1941 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1942 pb->old_ino, (long long) blockcnt,
1943 (unsigned long long) block,
1944 (unsigned long long) new_block);
1951 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1952 block, (int) blockcnt);
1964 static errcode_t progress_callback(ext2_filsys fs,
1965 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1966 dgrp_t group, void * priv_data)
1968 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1972 * This check is to protect against old ext2 libraries. It
1973 * shouldn't be needed against new libraries.
1978 if (rfs->progress) {
1979 io_channel_flush(fs->io);
1980 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1981 group+1, fs->group_desc_count);
1989 static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
1990 struct ext2_inode *inode, int *changed)
1996 /* No EA block or no remapping? Quit early. */
1997 if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 || !rfs->bmap)
1999 new_block = extent_translate(rfs->old_fs, rfs->bmap,
2000 ext2fs_file_acl_block(rfs->old_fs, inode));
2004 /* Set the new ACL block */
2005 ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
2007 /* Update checksum */
2008 if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
2009 err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
2012 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2013 err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
2014 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2017 err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
2024 ext2fs_free_mem(&buf);
2028 static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
2029 errcode_t code EXT2FS_ATTR((unused)),
2030 const char *fmt EXT2FS_ATTR((unused)),
2031 va_list args EXT2FS_ATTR((unused)))
2035 static int fix_ea_entries(ext2_extent imap, struct ext2_ext_attr_entry *entry,
2036 struct ext2_ext_attr_entry *end, ext2_ino_t last_ino)
2041 while (entry < end && !EXT2_EXT_IS_LAST_ENTRY(entry)) {
2042 if (entry->e_value_inum > last_ino) {
2043 new_ino = ext2fs_extent_translate(imap,
2044 entry->e_value_inum);
2045 entry->e_value_inum = new_ino;
2048 entry = EXT2_EXT_ATTR_NEXT(entry);
2053 static int fix_ea_ibody_entries(ext2_extent imap,
2054 struct ext2_inode_large *inode, int inode_size,
2055 ext2_ino_t last_ino)
2057 struct ext2_ext_attr_entry *start, *end;
2060 if (inode->i_extra_isize == 0)
2063 ea_magic = (__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
2064 inode->i_extra_isize);
2065 if (*ea_magic != EXT2_EXT_ATTR_MAGIC)
2068 start = (struct ext2_ext_attr_entry *)(ea_magic + 1);
2069 end = (struct ext2_ext_attr_entry *)((char *)inode + inode_size);
2071 return fix_ea_entries(imap, start, end, last_ino);
2074 static int fix_ea_block_entries(ext2_extent imap, char *block_buf,
2075 unsigned int blocksize, ext2_ino_t last_ino)
2077 struct ext2_ext_attr_header *header;
2078 struct ext2_ext_attr_entry *start, *end;
2080 header = (struct ext2_ext_attr_header *)block_buf;
2081 start = (struct ext2_ext_attr_entry *)(header+1);
2082 end = (struct ext2_ext_attr_entry *)(block_buf + blocksize);
2084 return fix_ea_entries(imap, start, end, last_ino);
2087 /* A simple LRU cache to check recently processed blocks. */
2093 #define BLK_IN_CACHE(b,c) ((b) == (c).blks[0] || (b) == (c).blks[1] || \
2094 (b) == (c).blks[2] || (b) == (c).blks[3])
2095 #define BLK_ADD_CACHE(b,c) { \
2096 (c).blks[(c).cursor] = (b); \
2097 (c).cursor = ((c).cursor + 1) % 4; \
2100 static errcode_t fix_ea_inode_refs(ext2_resize_t rfs, struct ext2_inode *inode,
2101 char *block_buf, ext2_ino_t last_ino)
2103 ext2_filsys fs = rfs->new_fs;
2104 ext2_inode_scan scan = NULL;
2106 int inode_size = EXT2_INODE_SIZE(fs->super);
2109 struct blk_cache blk_cache;
2110 struct ext2_ext_attr_header *header;
2113 memset(&blk_cache, 0, sizeof(blk_cache));
2115 header = (struct ext2_ext_attr_header *)block_buf;
2117 retval = ext2fs_open_inode_scan(fs, 0, &scan);
2122 retval = ext2fs_get_next_inode_full(scan, &ino, inode,
2129 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2130 continue; /* inode not in use */
2132 if (inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
2133 modified = fix_ea_ibody_entries(rfs->imap,
2134 (struct ext2_inode_large *)inode,
2135 inode_size, last_ino);
2137 retval = ext2fs_write_inode_full(fs, ino, inode,
2144 blk = ext2fs_file_acl_block(fs, inode);
2145 if (blk && !BLK_IN_CACHE(blk, blk_cache)) {
2146 retval = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
2150 modified = fix_ea_block_entries(rfs->imap, block_buf,
2154 retval = ext2fs_write_ext_attr3(fs, blk,
2159 * If refcount is greater than 1, we might see
2160 * the same block referenced by other inodes
2163 if (header->h_refcount > 1)
2164 BLK_ADD_CACHE(blk, blk_cache);
2171 ext2fs_close_inode_scan(scan);
2175 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
2177 struct process_block_struct pb;
2178 ext2_ino_t ino, new_inode;
2179 struct ext2_inode *inode = NULL;
2180 ext2_inode_scan scan = NULL;
2182 char *block_buf = 0;
2183 ext2_ino_t start_to_move;
2185 int update_ea_inode_refs = 0;
2187 if ((rfs->old_fs->group_desc_count <=
2188 rfs->new_fs->group_desc_count) &&
2192 set_com_err_hook(quiet_com_err_proc);
2194 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
2195 if (retval) goto errout;
2197 retval = ext2fs_init_dblist(rfs->old_fs, 0);
2198 if (retval) goto errout;
2199 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
2200 if (retval) goto errout;
2202 start_to_move = (rfs->new_fs->group_desc_count *
2203 rfs->new_fs->super->s_inodes_per_group);
2205 if (rfs->progress) {
2206 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
2207 0, rfs->old_fs->group_desc_count);
2211 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
2215 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
2216 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
2217 inode = malloc(inode_size);
2223 * First, copy all of the inodes that need to be moved
2224 * elsewhere in the inode table
2227 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
2228 if (retval) goto errout;
2232 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2233 continue; /* inode not in use */
2235 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
2238 /* Remap EA block */
2239 retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
2244 if (ino <= start_to_move)
2245 goto remap_blocks; /* Don't need to move inode. */
2248 * Find a new inode. Now that extents and directory blocks
2249 * are tied to the inode number through the checksum, we must
2250 * set up the new inode before we start rewriting blocks.
2252 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
2256 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
2259 * i_ctime field in xattr inodes contain a portion of the ref
2260 * count, do not overwrite.
2262 if (inode->i_flags & EXT4_EA_INODE_FL)
2263 update_ea_inode_refs = 1;
2265 inode->i_ctime = rfs->old_fs->now ?
2266 rfs->old_fs->now : time(0);
2268 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
2274 #ifdef RESIZE2FS_DEBUG
2275 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
2276 printf("Inode moved %u->%u\n", ino, new_inode);
2279 retval = ext2fs_create_extent_table(&rfs->imap, 0);
2283 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
2287 retval = ext2fs_write_inode_full(rfs->old_fs,
2294 * Update inodes to point to new blocks; schedule directory
2295 * blocks for inode remapping. Need to write out dir blocks
2296 * with new inode numbers if we have metadata_csum enabled.
2298 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2299 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
2300 (rfs->bmap || pb.is_dir)) {
2303 pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
2304 retval = ext2fs_block_iterate3(rfs->old_fs,
2305 new_inode, 0, block_buf,
2306 process_block, &pb);
2313 } else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
2314 (rfs->bmap || pb.is_dir)) {
2315 /* inline data dir; update it too */
2316 retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
2322 /* Fix up extent block checksums with the new inode number */
2323 if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
2324 (inode->i_flags & EXT4_EXTENTS_FL)) {
2325 retval = ext2fs_fix_extents_checksums(rfs->old_fs,
2332 if (update_ea_inode_refs &&
2333 ext2fs_has_feature_ea_inode(rfs->new_fs->super)) {
2334 retval = fix_ea_inode_refs(rfs, inode, block_buf,
2339 io_channel_flush(rfs->old_fs->io);
2342 reset_com_err_hook();
2343 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2345 ext2fs_free_extent_table(rfs->bmap);
2349 ext2fs_close_inode_scan(scan);
2351 ext2fs_free_mem(&block_buf);
2356 /* --------------------------------------------------------------------
2358 * Resize processing, phase 4.
2360 * --------------------------------------------------------------------
2366 unsigned int max_dirs;
2370 static int check_and_change_inodes(ext2_ino_t dir,
2371 int entry EXT2FS_ATTR((unused)),
2372 struct ext2_dir_entry *dirent, int offset,
2373 int blocksize EXT2FS_ATTR((unused)),
2374 char *buf EXT2FS_ATTR((unused)),
2377 struct istruct *is = (struct istruct *) priv_data;
2378 struct ext2_inode inode;
2379 ext2_ino_t new_inode;
2383 if (is->rfs->progress && offset == 0) {
2384 io_channel_flush(is->rfs->old_fs->io);
2385 is->err = (is->rfs->progress)(is->rfs,
2386 E2_RSZ_INODE_REF_UPD_PASS,
2387 ++is->num, is->max_dirs);
2389 return DIRENT_ABORT;
2393 * If we have checksums enabled and the inode wasn't present in the
2394 * old fs, then we must rewrite all dir blocks with new checksums.
2396 if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
2397 !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
2398 ret |= DIRENT_CHANGED;
2403 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
2407 #ifdef RESIZE2FS_DEBUG
2408 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
2409 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2410 dir, ext2fs_dirent_name_len(dirent), dirent->name,
2411 dirent->inode, new_inode);
2414 dirent->inode = new_inode;
2416 /* Update the directory mtime and ctime */
2417 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
2419 inode.i_mtime = inode.i_ctime = is->rfs->old_fs->now ?
2420 is->rfs->old_fs->now : time(0);
2421 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
2423 return ret | DIRENT_ABORT;
2426 return ret | DIRENT_CHANGED;
2429 static errcode_t inode_ref_fix(ext2_resize_t rfs)
2438 * Now, we iterate over all of the directories to update the
2442 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
2446 if (rfs->progress) {
2447 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2453 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2454 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
2455 DIRENT_FLAG_INCLUDE_EMPTY, 0,
2456 check_and_change_inodes, &is);
2457 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2465 if (rfs->progress && (is.num < is.max_dirs))
2466 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2467 is.max_dirs, is.max_dirs);
2470 ext2fs_free_extent_table(rfs->imap);
2476 /* --------------------------------------------------------------------
2478 * Resize processing, phase 5.
2480 * In this phase we actually move the inode table around, and then
2481 * update the summary statistics. This is scary, since aborting here
2482 * will potentially scramble the filesystem. (We are moving the
2483 * inode tables around in place, and so the potential for lost data,
2484 * or at the very least scrambling the mapping between filenames and
2485 * inode numbers is very high in case of a power failure here.)
2486 * --------------------------------------------------------------------
2491 * A very scary routine --- this one moves the inode table around!!!
2493 * After this you have to use the rfs->new_fs file handle to read and
2496 static errcode_t move_itables(ext2_resize_t rfs)
2500 dgrp_t i, max_groups;
2501 ext2_filsys fs = rfs->new_fs;
2503 blk64_t old_blk, new_blk, blk, cluster_freed;
2507 ext2fs_block_bitmap new_bmap = NULL;
2509 max_groups = fs->group_desc_count;
2510 if (max_groups > rfs->old_fs->group_desc_count)
2511 max_groups = rfs->old_fs->group_desc_count;
2513 size = fs->blocksize * fs->inode_blocks_per_group;
2514 if (!rfs->itable_buf) {
2515 retval = ext2fs_get_mem(size, &rfs->itable_buf);
2520 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
2521 retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
2526 retval = mark_table_blocks(fs, new_bmap);
2532 * Figure out how many inode tables we need to move
2534 to_move = moved = 0;
2535 for (i=0; i < max_groups; i++)
2536 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
2537 ext2fs_inode_table_loc(fs, i))
2545 if (rfs->progress) {
2546 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2552 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
2554 for (i=0; i < max_groups; i++) {
2555 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
2556 new_blk = ext2fs_inode_table_loc(fs, i);
2557 diff = new_blk - old_blk;
2559 #ifdef RESIZE2FS_DEBUG
2560 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2561 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2562 i, (unsigned long long) old_blk,
2563 (unsigned long long) new_blk, diff);
2571 retval = io_channel_read_blk64(fs->io, old_blk,
2572 fs->inode_blocks_per_group,
2577 * The end of the inode table segment often contains
2578 * all zeros, and we're often only moving the inode
2579 * table down a block or two. If so, we can optimize
2580 * things by not rewriting blocks that we know to be zero
2583 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
2586 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
2587 #ifdef RESIZE2FS_DEBUG
2588 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2589 printf("%d blocks of zeros...\n", n);
2591 num = fs->inode_blocks_per_group;
2595 retval = io_channel_write_blk64(fs->io, new_blk,
2596 num, rfs->itable_buf);
2598 io_channel_write_blk64(fs->io, old_blk,
2599 num, rfs->itable_buf);
2603 retval = io_channel_write_blk64(fs->io,
2604 old_blk + fs->inode_blocks_per_group,
2605 diff, (rfs->itable_buf +
2606 (fs->inode_blocks_per_group - diff) *
2612 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
2613 j < fs->inode_blocks_per_group;) {
2614 if (new_bmap == NULL ||
2615 !ext2fs_test_block_bitmap2(new_bmap, blk)) {
2616 ext2fs_block_alloc_stats2(fs, blk, -1);
2617 cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
2618 (blk & EXT2FS_CLUSTER_MASK(fs));
2619 blk += cluster_freed;
2627 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
2628 ext2fs_group_desc_csum_set(rfs->old_fs, i);
2629 ext2fs_mark_super_dirty(rfs->old_fs);
2630 ext2fs_flush(rfs->old_fs);
2632 if (rfs->progress) {
2633 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2639 mark_table_blocks(fs, fs->block_map);
2641 #ifdef RESIZE2FS_DEBUG
2642 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2643 printf("Inode table move finished.\n");
2649 ext2fs_free_block_bitmap(new_bmap);
2654 * This function is used when expanding a file system. It frees the
2655 * superblock and block group descriptor blocks from the block group
2656 * which is no longer the last block group.
2658 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
2660 ext2_filsys fs = rfs->new_fs;
2661 ext2_filsys old_fs = rfs->old_fs;
2663 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2664 dgrp_t last_bg = fs->group_desc_count - 1;
2665 blk64_t sb, old_desc;
2668 if (!ext2fs_has_feature_sparse_super2(fs->super))
2671 if (last_bg <= old_last_bg)
2674 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2675 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2678 if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
2679 old_fs->super->s_backup_bgs[1] != old_last_bg)
2682 if (fs->super->s_backup_bgs[0] == old_last_bg ||
2683 fs->super->s_backup_bgs[1] == old_last_bg)
2686 if (old_last_bg == 0)
2689 retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
2690 &sb, &old_desc, NULL, &num);
2695 ext2fs_unmark_block_bitmap2(fs->block_map, sb);
2697 ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
2702 * This function is used when shrinking a file system. We need to
2703 * utilize blocks from what will be the new last block group for the
2704 * backup superblock and block group descriptor blocks.
2705 * Unfortunately, those blocks may be used by other files or fs
2706 * metadata blocks. We need to mark them as being in use.
2708 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
2709 ext2fs_block_bitmap meta_bmap)
2711 ext2_filsys fs = rfs->new_fs;
2712 ext2_filsys old_fs = rfs->old_fs;
2714 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2715 dgrp_t last_bg = fs->group_desc_count - 1;
2717 blk64_t blk, sb, old_desc;
2721 if (!ext2fs_has_feature_sparse_super2(fs->super))
2724 if (last_bg >= old_last_bg)
2727 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2728 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2731 if (fs->super->s_backup_bgs[0] != last_bg &&
2732 fs->super->s_backup_bgs[1] != last_bg)
2735 if (old_fs->super->s_backup_bgs[0] == last_bg ||
2736 old_fs->super->s_backup_bgs[1] == last_bg)
2739 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
2740 &sb, &old_desc, NULL, &num);
2744 if (last_bg && !sb) {
2745 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2749 if (old_desc && old_desc != sb+1) {
2750 fputs(_("Should never happen! Unexpected old_desc in "
2751 "super_sparse bg?\n"),
2755 num = (old_desc) ? num : 1;
2757 /* Reserve the backup blocks */
2758 ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
2760 for (g = 0; g < fs->group_desc_count; g++) {
2763 mb = ext2fs_block_bitmap_loc(fs, g);
2764 if ((mb >= sb) && (mb < sb + num)) {
2765 ext2fs_block_bitmap_loc_set(fs, g, 0);
2768 mb = ext2fs_inode_bitmap_loc(fs, g);
2769 if ((mb >= sb) && (mb < sb + num)) {
2770 ext2fs_inode_bitmap_loc_set(fs, g, 0);
2773 mb = ext2fs_inode_table_loc(fs, g);
2774 if ((mb < sb + num) &&
2775 (sb < mb + fs->inode_blocks_per_group)) {
2776 ext2fs_inode_table_loc_set(fs, g, 0);
2780 retval = ext2fs_allocate_group_table(fs, g, 0);
2786 for (blk = sb, i = 0; i < num; blk++, i++) {
2787 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
2788 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
2789 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
2790 rfs->needed_blocks++;
2792 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
2798 * Fix the resize inode
2800 static errcode_t fix_resize_inode(ext2_filsys fs)
2802 struct ext2_inode inode;
2805 if (!ext2fs_has_feature_resize_inode(fs->super))
2808 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
2809 if (retval) goto errout;
2811 ext2fs_iblk_set(fs, &inode, 1);
2813 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
2814 if (retval) goto errout;
2816 if (!inode.i_block[EXT2_DIND_BLOCK]) {
2818 * Avoid zeroing out block #0; that's rude. This
2819 * should never happen anyway since the filesystem
2820 * should be fsck'ed and we assume it is consistent.
2822 fprintf(stderr, "%s",
2823 _("Should never happen: resize inode corrupt!\n"));
2827 retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
2832 retval = ext2fs_create_resize_inode(fs);
2841 * Finally, recalculate the summary information
2843 static errcode_t resize2fs_calculate_summary_stats(ext2_filsys fs)
2846 blk64_t blk = fs->super->s_first_data_block;
2848 unsigned int n, group, count;
2849 blk64_t total_clusters_free = 0;
2850 int total_inodes_free = 0;
2856 * First calculate the block statistics
2858 bitmap_buf = malloc(fs->blocksize);
2861 for (group = 0; group < fs->group_desc_count;
2863 retval = ext2fs_get_block_bitmap_range2(fs->block_map,
2864 B2C(blk), fs->super->s_clusters_per_group, bitmap_buf);
2869 n = ext2fs_bitcount(bitmap_buf,
2870 fs->super->s_clusters_per_group / 8);
2871 group_free = fs->super->s_clusters_per_group - n;
2872 total_clusters_free += group_free;
2873 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
2874 ext2fs_group_desc_csum_set(fs, group);
2875 blk += fs->super->s_blocks_per_group;
2878 ext2fs_free_blocks_count_set(fs->super, C2B(total_clusters_free));
2881 * Next, calculate the inode statistics
2887 /* Protect loop from wrap-around if s_inodes_count maxed */
2888 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2889 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
2891 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
2893 total_inodes_free++;
2896 if ((count == fs->super->s_inodes_per_group) ||
2897 (ino == fs->super->s_inodes_count)) {
2898 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
2899 ext2fs_group_desc_csum_set(fs, group);
2901 if (group >= fs->group_desc_count)
2905 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2908 fs->super->s_free_inodes_count = total_inodes_free;
2909 ext2fs_mark_super_dirty(fs);
2914 * Journal may have been relocated; update the backup journal blocks
2915 * in the superblock.
2917 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
2920 struct ext2_inode inode;
2922 if (!ext2fs_has_feature_journal(fs->super))
2925 /* External journal? Nothing to do. */
2926 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2929 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2932 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2933 fs->super->s_jnl_blocks[15] = inode.i_size_high;
2934 fs->super->s_jnl_blocks[16] = inode.i_size;
2935 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2936 ext2fs_mark_super_dirty(fs);
2940 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2941 int old_desc_blocks)
2943 blk64_t super_blk, old_desc_blk, new_desc_blk;
2946 /* inode table blocks plus allocation bitmaps */
2947 overhead = fs->inode_blocks_per_group + 2;
2949 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2950 &old_desc_blk, &new_desc_blk, 0);
2951 if ((grp == 0) || super_blk)
2954 overhead += old_desc_blocks;
2955 else if (new_desc_blk)
2962 * calculate the minimum number of blocks the given fs can be resized to
2964 blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
2966 ext2_ino_t inode_count;
2967 dgrp_t groups, flex_groups;
2968 blk64_t blks_needed, data_blocks;
2969 blk64_t grp, data_needed, last_start;
2970 blk64_t overhead = 0;
2971 int old_desc_blocks;
2972 unsigned flexbg_size = 1U << fs->super->s_log_groups_per_flex;
2975 * first figure out how many group descriptors we need to
2976 * handle the number of inodes we have
2978 inode_count = fs->super->s_inodes_count -
2979 fs->super->s_free_inodes_count;
2980 blks_needed = ext2fs_div_ceil(inode_count,
2981 fs->super->s_inodes_per_group) *
2982 (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
2983 groups = ext2fs_div64_ceil(blks_needed,
2984 EXT2_BLOCKS_PER_GROUP(fs->super));
2985 #ifdef RESIZE2FS_DEBUG
2986 if (flags & RESIZE_DEBUG_MIN_CALC)
2987 printf("fs has %d inodes, %d groups required.\n",
2988 inode_count, groups);
2992 * number of old-style block group descriptor blocks
2994 if (ext2fs_has_feature_meta_bg(fs->super))
2995 old_desc_blocks = fs->super->s_first_meta_bg;
2997 old_desc_blocks = fs->desc_blocks +
2998 fs->super->s_reserved_gdt_blocks;
3000 /* calculate how many blocks are needed for data */
3001 data_needed = ext2fs_blocks_count(fs->super);
3002 for (grp = 0; grp < fs->group_desc_count; grp++) {
3003 __u32 n = ext2fs_bg_free_blocks_count(fs, grp);
3005 if (n > EXT2_BLOCKS_PER_GROUP(fs->super))
3006 n = EXT2_BLOCKS_PER_GROUP(fs->super);
3007 n += calc_group_overhead(fs, grp, old_desc_blocks);
3008 if (data_needed < n) {
3009 if (flags & RESIZE_DEBUG_MIN_CALC)
3010 printf("file system appears inconsistent?!?\n");
3011 return ext2fs_blocks_count(fs->super);
3015 #ifdef RESIZE2FS_DEBUG
3016 if (flags & RESIZE_DEBUG_MIN_CALC)
3017 printf("fs requires %llu data blocks.\n",
3018 (unsigned long long) data_needed);
3022 * For ext4 we need to allow for up to a flex_bg worth of
3023 * inode tables of slack space so the resize operation can be
3024 * guaranteed to finish.
3026 flex_groups = groups;
3027 if (ext2fs_has_feature_flex_bg(fs->super)) {
3028 dgrp_t remainder = groups & (flexbg_size - 1);
3030 flex_groups += flexbg_size - remainder;
3031 if (flex_groups > fs->group_desc_count)
3032 flex_groups = fs->group_desc_count;
3036 * figure out how many data blocks we have given the number of groups
3037 * we need for our inodes
3039 data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
3041 for (grp = 0; grp < flex_groups; grp++) {
3042 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
3045 * we want to keep track of how much data we can store in
3046 * the groups leading up to the last group so we can determine
3047 * how big the last group needs to be
3049 if (grp < (groups - 1))
3050 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
3053 if (data_blocks > overhead)
3054 data_blocks -= overhead;
3058 #ifdef RESIZE2FS_DEBUG
3059 if (flags & RESIZE_DEBUG_MIN_CALC)
3060 printf("With %d group(s), we have %llu blocks available.\n",
3061 groups, (unsigned long long) data_blocks);
3065 * if we need more group descriptors in order to accommodate our data
3066 * then we need to add them here
3068 blks_needed = data_needed;
3069 while (blks_needed > data_blocks) {
3070 blk64_t remainder = blks_needed - data_blocks;
3073 /* figure out how many more groups we need for the data */
3074 extra_grps = ext2fs_div64_ceil(remainder,
3075 EXT2_BLOCKS_PER_GROUP(fs->super));
3077 data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
3079 /* ok we have to account for the last group */
3080 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
3081 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
3084 groups += extra_grps;
3085 if (!ext2fs_has_feature_flex_bg(fs->super))
3086 flex_groups = groups;
3087 else if (groups > flex_groups) {
3088 dgrp_t r = groups & (flexbg_size - 1);
3090 flex_groups = groups + flexbg_size - r;
3091 if (flex_groups > fs->group_desc_count)
3092 flex_groups = fs->group_desc_count;
3095 for (; grp < flex_groups; grp++) {
3096 overhead = calc_group_overhead(fs, grp,
3100 * again, we need to see how much data we cram into
3101 * all of the groups leading up to the last group
3103 if (grp < groups - 1)
3104 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
3107 data_blocks -= overhead;
3110 #ifdef RESIZE2FS_DEBUG
3111 if (flags & RESIZE_DEBUG_MIN_CALC)
3112 printf("Added %d extra group(s), "
3113 "blks_needed %llu, data_blocks %llu, "
3114 "last_start %llu\n", extra_grps,
3115 (unsigned long long) blks_needed,
3116 (unsigned long long) data_blocks,
3117 (unsigned long long) last_start);
3121 /* now for the fun voodoo */
3123 if (ext2fs_has_feature_flex_bg(fs->super) &&
3124 (grp & ~(flexbg_size - 1)) == 0)
3125 grp = grp & ~(flexbg_size - 1);
3127 for (; grp < flex_groups; grp++)
3128 overhead += calc_group_overhead(fs, grp, old_desc_blocks);
3130 #ifdef RESIZE2FS_DEBUG
3131 if (flags & RESIZE_DEBUG_MIN_CALC)
3132 printf("Last group's overhead is %llu\n",
3133 (unsigned long long) overhead);
3137 * if this is the case then the last group is going to have data in it
3138 * so we need to adjust the size of the last group accordingly
3140 if (last_start < blks_needed) {
3141 blk64_t remainder = blks_needed - last_start;
3143 #ifdef RESIZE2FS_DEBUG
3144 if (flags & RESIZE_DEBUG_MIN_CALC)
3145 printf("Need %llu data blocks in last group\n",
3146 (unsigned long long) remainder);
3149 * 50 is a magic number that mkfs/resize uses to see if its
3150 * even worth making/resizing the fs. basically you need to
3151 * have at least 50 blocks in addition to the blocks needed
3152 * for the metadata in the last group
3155 overhead += remainder;
3161 overhead += fs->super->s_first_data_block;
3162 #ifdef RESIZE2FS_DEBUG
3163 if (flags & RESIZE_DEBUG_MIN_CALC)
3164 printf("Final size of last group is %llu\n",
3165 (unsigned long long) overhead);
3168 /* Add extra slack for bigalloc file systems */
3169 if (EXT2FS_CLUSTER_RATIO(fs) > 1)
3170 overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
3173 * since our last group doesn't have to be BLOCKS_PER_GROUP
3174 * large, we only do groups-1, and then add the number of
3175 * blocks needed to handle the group descriptor metadata+data
3178 blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
3179 blks_needed += overhead;
3182 * Make sure blks_needed covers the end of the inode table in
3183 * the last block group.
3185 overhead = ext2fs_inode_table_loc(fs, groups-1) +
3186 fs->inode_blocks_per_group;
3187 if (blks_needed < overhead)
3188 blks_needed = overhead;
3190 #ifdef RESIZE2FS_DEBUG
3191 if (flags & RESIZE_DEBUG_MIN_CALC)
3192 printf("Estimated blocks needed: %llu\n",
3193 (unsigned long long) blks_needed);
3197 * If at this point we've already added up more "needed" than
3198 * the current size, just return current size as minimum.
3200 if (blks_needed >= ext2fs_blocks_count(fs->super))
3201 return ext2fs_blocks_count(fs->super);
3203 * We need to reserve a few extra blocks if extents are
3204 * enabled, in case we need to grow the extent tree. The more
3205 * we shrink the file system, the more space we need.
3207 * The absolute worst case is every single data block is in
3208 * the part of the file system that needs to be evacuated,
3209 * with each data block needs to be in its own extent, and
3210 * with each inode needing at least one extent block.
3212 if (ext2fs_has_feature_extents(fs->super)) {
3213 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
3215 unsigned int exts_per_blk = (fs->blocksize /
3216 sizeof(struct ext3_extent)) - 1;
3217 blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
3220 if (worst_case < inode_count)
3221 worst_case = inode_count;
3223 if (safe_margin > worst_case)
3224 safe_margin = worst_case;
3226 #ifdef RESIZE2FS_DEBUG
3227 if (flags & RESIZE_DEBUG_MIN_CALC)
3228 printf("Extents safety margin: %llu\n",
3229 (unsigned long long) safe_margin);
3231 blks_needed += safe_margin;