2 * resize2fs.c --- ext2 main routine
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
7 * Copyright (C) 1999, 2000 by Theosore Ts'o
10 * This file may be redistributed under the terms of the GNU Public
16 * Resizing a filesystem consists of the following phases:
18 * 1. Adjust superblock and write out new parts of the inode
20 * 2. Determine blocks which need to be relocated, and copy the
21 * contents of blocks from their old locations to the new ones.
22 * 3. Scan the inode table, doing the following:
23 * a. If blocks have been moved, update the block
24 * pointers in the inodes and indirect blocks to
25 * point at the new block locations.
26 * b. If parts of the inode table need to be evacuated,
27 * copy inodes from their old locations to their
29 * c. If (b) needs to be done, note which blocks contain
30 * directory information, since we will need to
31 * update the directory information.
32 * 4. Update the directory blocks with the new inode locations.
33 * 5. Move the inode tables, if necessary.
37 #include "resize2fs.h"
40 #ifdef __linux__ /* Kludge for debugging */
41 #define RESIZE2FS_DEBUG
44 static void fix_uninit_block_bitmaps(ext2_filsys fs);
45 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size);
46 static errcode_t blocks_to_move(ext2_resize_t rfs);
47 static errcode_t block_mover(ext2_resize_t rfs);
48 static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
49 static errcode_t inode_ref_fix(ext2_resize_t rfs);
50 static errcode_t move_itables(ext2_resize_t rfs);
51 static errcode_t fix_resize_inode(ext2_filsys fs);
52 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
53 static errcode_t fix_sb_journal_backup(ext2_filsys fs);
54 static errcode_t mark_table_blocks(ext2_filsys fs,
55 ext2fs_block_bitmap bmap);
56 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs);
57 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
58 ext2fs_block_bitmap meta_bmap);
59 static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size);
60 static errcode_t move_bg_metadata(ext2_resize_t rfs);
61 static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs);
64 * Some helper functions to check if a block is in a metadata area
66 static inline int is_block_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
68 return blk == ext2fs_block_bitmap_loc(fs, grp);
71 static inline int is_inode_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
73 return blk == ext2fs_inode_bitmap_loc(fs, grp);
76 static inline int is_inode_tb(ext2_filsys fs, unsigned int grp, blk64_t blk)
78 return blk >= ext2fs_inode_table_loc(fs, grp) &&
79 blk < (ext2fs_inode_table_loc(fs, grp) +
80 fs->inode_blocks_per_group);
83 /* Some bigalloc helper macros which are more succint... */
84 #define B2C(x) EXT2FS_B2C(fs, (x))
85 #define C2B(x) EXT2FS_C2B(fs, (x))
86 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
87 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
88 #define LT_CLSTR(x, y) (B2C(x) < B2C(y))
89 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
90 #define GT_CLSTR(x, y) (B2C(x) > B2C(y))
92 static int lazy_itable_init;
95 * This is the top-level routine which does the dirty deed....
97 errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
98 errcode_t (*progress)(ext2_resize_t rfs, int pass,
100 unsigned long max_val))
104 struct resource_track rtrack, overall_track;
107 * Create the data structure
109 retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
113 memset(rfs, 0, sizeof(struct ext2_resize_struct));
118 rfs->progress = progress;
120 init_resource_track(&overall_track, "overall resize2fs", fs->io);
121 init_resource_track(&rtrack, "read_bitmaps", fs->io);
122 retval = ext2fs_read_bitmaps(fs);
125 print_resource_track(rfs, &rtrack, fs->io);
127 fs->super->s_state |= EXT2_ERROR_FS;
128 ext2fs_mark_super_dirty(fs);
131 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 1", fs->io);
132 fix_uninit_block_bitmaps(fs);
133 print_resource_track(rfs, &rtrack, fs->io);
134 retval = ext2fs_dup_handle(fs, &rfs->new_fs);
138 init_resource_track(&rtrack, "resize_group_descriptors", fs->io);
139 retval = resize_group_descriptors(rfs, *new_size);
142 print_resource_track(rfs, &rtrack, fs->io);
144 init_resource_track(&rtrack, "move_bg_metadata", fs->io);
145 retval = move_bg_metadata(rfs);
148 print_resource_track(rfs, &rtrack, fs->io);
150 init_resource_track(&rtrack, "zero_high_bits_in_metadata", fs->io);
151 retval = zero_high_bits_in_inodes(rfs);
154 print_resource_track(rfs, &rtrack, fs->io);
156 init_resource_track(&rtrack, "adjust_superblock", fs->io);
157 retval = adjust_superblock(rfs, *new_size);
160 print_resource_track(rfs, &rtrack, fs->io);
162 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
163 fix_uninit_block_bitmaps(rfs->new_fs);
164 print_resource_track(rfs, &rtrack, fs->io);
165 /* Clear the block bitmap uninit flag for the last block group */
166 ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
167 EXT2_BG_BLOCK_UNINIT);
169 *new_size = ext2fs_blocks_count(rfs->new_fs->super);
171 init_resource_track(&rtrack, "blocks_to_move", fs->io);
172 retval = blocks_to_move(rfs);
175 print_resource_track(rfs, &rtrack, fs->io);
177 #ifdef RESIZE2FS_DEBUG
178 if (rfs->flags & RESIZE_DEBUG_BMOVE)
179 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
180 ext2fs_free_blocks_count(rfs->old_fs->super),
181 ext2fs_free_blocks_count(rfs->new_fs->super),
185 init_resource_track(&rtrack, "block_mover", fs->io);
186 retval = block_mover(rfs);
189 print_resource_track(rfs, &rtrack, fs->io);
191 init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
192 retval = inode_scan_and_fix(rfs);
195 print_resource_track(rfs, &rtrack, fs->io);
197 init_resource_track(&rtrack, "inode_ref_fix", fs->io);
198 retval = inode_ref_fix(rfs);
201 print_resource_track(rfs, &rtrack, fs->io);
203 init_resource_track(&rtrack, "move_itables", fs->io);
204 retval = move_itables(rfs);
207 print_resource_track(rfs, &rtrack, fs->io);
209 init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
210 retval = ext2fs_calculate_summary_stats(rfs->new_fs);
213 print_resource_track(rfs, &rtrack, fs->io);
215 init_resource_track(&rtrack, "fix_resize_inode", fs->io);
216 retval = fix_resize_inode(rfs->new_fs);
219 print_resource_track(rfs, &rtrack, fs->io);
221 init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
222 retval = fix_sb_journal_backup(rfs->new_fs);
225 print_resource_track(rfs, &rtrack, fs->io);
227 retval = clear_sparse_super2_last_group(rfs);
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 += EXT2_DESC_SIZE(rfs->new_fs->super);
333 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_LINUX)
527 retval = ext2fs_open_inode_scan(fs, 0, &scan);
531 retval = ext2fs_get_mem(length, &inode);
536 retval = ext2fs_get_next_inode_full(scan, &ino, inode, length);
541 if (!ext2fs_test_inode_bitmap2(fs->inode_map, ino))
545 * Here's how we deal with high block number fields:
547 * - i_size_high has been been written out with i_size_lo
548 * since the ext2 days, so no conversion is needed.
550 * - i_blocks_hi is guarded by both the huge_file feature and
551 * inode flags and has always been written out with
552 * i_blocks_lo if the feature is set. The field is only
553 * ever read if both feature and inode flag are set, so
554 * we don't need to zero it now.
556 * - i_file_acl_high can be uninitialized, so zero it if
559 if (inode->osd2.linux2.l_i_file_acl_high) {
560 inode->osd2.linux2.l_i_file_acl_high = 0;
561 retval = ext2fs_write_inode_full(fs, ino, inode,
567 retval = zero_high_bits_in_extents(fs, ino, inode);
574 ext2fs_free_mem(&inode);
576 ext2fs_close_inode_scan(scan);
581 * Clean up the bitmaps for unitialized bitmaps
583 static void fix_uninit_block_bitmaps(ext2_filsys fs)
589 if (!ext2fs_has_group_desc_csum(fs))
592 for (g=0; g < fs->group_desc_count; g++) {
593 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
596 blk = ext2fs_group_first_block2(fs, g);
597 lblk = ext2fs_group_last_block2(fs, g);
598 ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
601 ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
602 ext2fs_mark_block_bitmap2(fs->block_map,
603 ext2fs_block_bitmap_loc(fs, g));
604 ext2fs_mark_block_bitmap2(fs->block_map,
605 ext2fs_inode_bitmap_loc(fs, g));
606 for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
607 i < (unsigned int) 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;
702 unsigned long long new_inodes; /* u64 to check for overflow */
705 ext2fs_blocks_count_set(fs->super, new_size);
708 fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
709 fs->super->s_first_data_block,
710 EXT2_BLOCKS_PER_GROUP(fs->super));
711 if (fs->group_desc_count == 0)
712 return EXT2_ET_TOOSMALL;
713 fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
714 EXT2_DESC_PER_BLOCK(fs->super));
717 * Overhead is the number of bookkeeping blocks per group. It
718 * includes the superblock backup, the group descriptor
719 * backups, the inode bitmap, the block bitmap, and the inode
722 overhead = (int) (2 + fs->inode_blocks_per_group);
724 if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
725 overhead += 1 + fs->desc_blocks +
726 fs->super->s_reserved_gdt_blocks;
729 * See if the last group is big enough to support the
730 * necessary data structures. If not, we need to get rid of
733 rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
734 fs->super->s_blocks_per_group;
735 if ((fs->group_desc_count == 1) && rem && (rem < overhead))
736 return EXT2_ET_TOOSMALL;
737 if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
738 ext2fs_blocks_count_set(fs->super,
739 ext2fs_blocks_count(fs->super) - rem);
743 * Adjust the number of inodes
745 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
746 if (new_inodes > ~0U) {
747 fprintf(stderr, _("inodes (%llu) must be less than %u"),
749 return EXT2_ET_TOO_MANY_INODES;
751 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
752 fs->group_desc_count;
755 * Adjust the number of free blocks
757 blk = ext2fs_blocks_count(old_fs->super);
758 if (blk > ext2fs_blocks_count(fs->super))
759 ext2fs_free_blocks_count_set(fs->super,
760 ext2fs_free_blocks_count(fs->super) -
761 (blk - ext2fs_blocks_count(fs->super)));
763 ext2fs_free_blocks_count_set(fs->super,
764 ext2fs_free_blocks_count(fs->super) +
765 (ext2fs_blocks_count(fs->super) - blk));
768 * Adjust the number of reserved blocks
770 percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
771 ext2fs_blocks_count(old_fs->super);
772 ext2fs_r_blocks_count_set(fs->super,
773 (percent * ext2fs_blocks_count(fs->super) /
777 * Adjust the bitmaps for size
779 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
780 fs->super->s_inodes_count,
782 if (retval) goto errout;
784 real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
785 fs->super->s_first_data_block;
786 retval = ext2fs_resize_block_bitmap2(new_size - 1,
787 real_end, fs->block_map);
788 if (retval) goto errout;
791 * If we are growing the file system, also grow the size of
792 * the reserve_blocks bitmap
794 if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
795 retval = ext2fs_resize_block_bitmap2(new_size - 1,
796 real_end, reserve_blocks);
797 if (retval) goto errout;
801 * Reallocate the group descriptors as necessary.
803 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
804 old_fs->desc_blocks != fs->desc_blocks) {
805 retval = ext2fs_resize_mem(old_fs->desc_blocks *
807 fs->desc_blocks * fs->blocksize,
811 if (fs->desc_blocks > old_fs->desc_blocks)
812 memset((char *) fs->group_desc +
813 (old_fs->desc_blocks * fs->blocksize), 0,
814 (fs->desc_blocks - old_fs->desc_blocks) *
819 * If the resize_inode feature is set, and we are changing the
820 * number of descriptor blocks, then adjust
821 * s_reserved_gdt_blocks if possible to avoid needing to move
822 * the inode table either now or in the future.
824 * Note: If we're converting to 64bit mode, we did this earlier.
826 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
827 adjust_reserved_gdt_blocks(old_fs, fs);
829 if (ext2fs_has_feature_meta_bg(fs->super) &&
830 (fs->super->s_first_meta_bg > fs->desc_blocks)) {
831 ext2fs_clear_feature_meta_bg(fs->super);
832 fs->super->s_first_meta_bg = 0;
836 * Update the location of the backup superblocks if the
837 * sparse_super2 feature is enabled.
839 if (ext2fs_has_feature_sparse_super2(fs->super)) {
840 dgrp_t last_bg = fs->group_desc_count - 1;
841 dgrp_t old_last_bg = old_fs->group_desc_count - 1;
843 if (last_bg > old_last_bg) {
844 if (old_fs->group_desc_count == 1)
845 fs->super->s_backup_bgs[0] = 1;
846 if (old_fs->group_desc_count == 1 &&
847 fs->super->s_backup_bgs[0])
848 fs->super->s_backup_bgs[0] = last_bg;
849 else if (fs->super->s_backup_bgs[1])
850 fs->super->s_backup_bgs[1] = last_bg;
851 } else if (last_bg < old_last_bg) {
852 if (fs->super->s_backup_bgs[0] > last_bg)
853 fs->super->s_backup_bgs[0] = 0;
854 if (fs->super->s_backup_bgs[1] > last_bg)
855 fs->super->s_backup_bgs[1] = 0;
857 old_fs->super->s_backup_bgs[1] == old_last_bg)
858 fs->super->s_backup_bgs[1] = last_bg;
863 * If we are shrinking the number of block groups, we're done
866 if (old_fs->group_desc_count > fs->group_desc_count) {
868 * Check the block groups that we are chopping off
869 * and free any blocks associated with their metadata
871 retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
872 fs->group_desc_count);
877 * Fix the count of the last (old) block group
879 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
880 old_fs->super->s_first_data_block) %
881 old_fs->super->s_blocks_per_group;
883 old_numblocks = old_fs->super->s_blocks_per_group;
884 if (old_fs->group_desc_count == fs->group_desc_count) {
885 numblocks = (ext2fs_blocks_count(fs->super) -
886 fs->super->s_first_data_block) %
887 fs->super->s_blocks_per_group;
889 numblocks = fs->super->s_blocks_per_group;
891 numblocks = fs->super->s_blocks_per_group;
892 i = old_fs->group_desc_count - 1;
893 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
894 ext2fs_group_desc_csum_set(fs, i);
897 * If the number of block groups is staying the same, we're
898 * done and can exit now. (If the number block groups is
899 * shrinking, we had exited earlier.)
901 if (old_fs->group_desc_count >= fs->group_desc_count) {
907 * Initialize the new block group descriptors
909 group_block = ext2fs_group_first_block2(fs,
910 old_fs->group_desc_count);
911 csum_flag = ext2fs_has_group_desc_csum(fs);
912 if (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
913 access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0)
914 lazy_itable_init = 1;
915 if (ext2fs_has_feature_meta_bg(fs->super))
916 old_desc_blocks = fs->super->s_first_meta_bg;
918 old_desc_blocks = fs->desc_blocks +
919 fs->super->s_reserved_gdt_blocks;
922 * If we changed the number of block_group descriptor blocks,
923 * we need to make sure they are all marked as reserved in the
924 * file systems's block allocation map.
926 for (i = 0; i < old_fs->group_desc_count; i++)
927 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
929 for (i = old_fs->group_desc_count;
930 i < fs->group_desc_count; i++) {
931 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
932 sizeof(struct ext2_group_desc));
935 ext2fs_bg_flags_zap(fs, i);
937 ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
938 if (!lazy_itable_init)
939 ext2fs_bg_flags_set(fs, i,
940 EXT2_BG_INODE_ZEROED);
941 ext2fs_bg_itable_unused_set(fs, i,
942 fs->super->s_inodes_per_group);
945 numblocks = ext2fs_group_blocks_count(fs, i);
946 if ((i < fs->group_desc_count - 1) && csum_flag)
947 ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
949 has_super = ext2fs_bg_has_super(fs, i);
951 ext2fs_block_alloc_stats2(fs, group_block, +1);
954 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
955 meta_bg = i / meta_bg_size;
956 if (!ext2fs_has_feature_meta_bg(fs->super) ||
957 (meta_bg < fs->super->s_first_meta_bg)) {
959 for (j=0; j < old_desc_blocks; j++)
960 ext2fs_block_alloc_stats2(fs,
961 group_block + 1 + j, +1);
962 adjblocks += old_desc_blocks;
967 if (((i % meta_bg_size) == 0) ||
968 ((i % meta_bg_size) == 1) ||
969 ((i % meta_bg_size) == (meta_bg_size-1)))
970 ext2fs_block_alloc_stats2(fs,
971 group_block + has_super, +1);
974 adjblocks += 2 + fs->inode_blocks_per_group;
976 numblocks -= adjblocks;
977 ext2fs_free_blocks_count_set(fs->super,
978 ext2fs_free_blocks_count(fs->super) - adjblocks);
979 fs->super->s_free_inodes_count +=
980 fs->super->s_inodes_per_group;
981 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
982 ext2fs_bg_free_inodes_count_set(fs, i,
983 fs->super->s_inodes_per_group);
984 ext2fs_bg_used_dirs_count_set(fs, i, 0);
985 ext2fs_group_desc_csum_set(fs, i);
987 retval = ext2fs_allocate_group_table(fs, i, 0);
988 if (retval) goto errout;
990 group_block += fs->super->s_blocks_per_group;
995 * Mark all of the metadata blocks as reserved so they won't
996 * get allocated by the call to ext2fs_allocate_group_table()
997 * in blocks_to_move(), where we allocate new blocks to
998 * replace those allocation bitmap and inode table blocks
999 * which have to get relocated to make space for an increased
1000 * number of the block group descriptors.
1003 mark_table_blocks(fs, reserve_blocks);
1010 * This routine adjusts the superblock and other data structures, both
1011 * in disk as well as in memory...
1013 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
1015 ext2_filsys fs = rfs->new_fs;
1018 blk64_t group_block;
1020 unsigned long max_group;
1022 ext2fs_mark_super_dirty(fs);
1023 ext2fs_mark_bb_dirty(fs);
1024 ext2fs_mark_ib_dirty(fs);
1026 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
1027 &rfs->reserve_blocks);
1031 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
1036 * Check to make sure there are enough inodes
1038 if ((rfs->old_fs->super->s_inodes_count -
1039 rfs->old_fs->super->s_free_inodes_count) >
1040 rfs->new_fs->super->s_inodes_count) {
1046 * If we are shrinking the number block groups, we're done and
1049 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
1055 * If the number of block groups is staying the same, we're
1056 * done and can exit now. (If the number block groups is
1057 * shrinking, we had exited earlier.)
1059 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
1065 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1066 * supports lazy inode initialization, we can skip
1067 * initializing the inode table.
1069 if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
1075 * Initialize the inode table
1077 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
1082 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
1083 group_block = ext2fs_group_first_block2(fs,
1084 rfs->old_fs->group_desc_count);
1085 adj = rfs->old_fs->group_desc_count;
1086 max_group = fs->group_desc_count - adj;
1087 if (rfs->progress) {
1088 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1093 for (i = rfs->old_fs->group_desc_count;
1094 i < fs->group_desc_count; i++) {
1096 * Write out the new inode table
1098 retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
1099 fs->inode_blocks_per_group, NULL,
1104 io_channel_flush(fs->io);
1105 if (rfs->progress) {
1106 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1107 i - adj + 1, max_group);
1111 group_block += fs->super->s_blocks_per_group;
1113 io_channel_flush(fs->io);
1120 /* --------------------------------------------------------------------
1122 * Resize processing, phase 2.
1124 * In this phase we adjust determine which blocks need to be moved, in
1125 * blocks_to_move(). We then copy the blocks to their ultimate new
1126 * destinations using block_mover(). Since we are copying blocks to
1127 * their new locations, again during this pass we can abort without
1129 * --------------------------------------------------------------------
1133 * This helper function creates a block bitmap with all of the
1134 * filesystem meta-data blocks.
1136 static errcode_t mark_table_blocks(ext2_filsys fs,
1137 ext2fs_block_bitmap bmap)
1142 for (i = 0; i < fs->group_desc_count; i++) {
1143 ext2fs_reserve_super_and_bgd(fs, i, bmap);
1146 * Mark the blocks used for the inode table
1148 blk = ext2fs_inode_table_loc(fs, i);
1150 ext2fs_mark_block_bitmap_range2(bmap, blk,
1151 fs->inode_blocks_per_group);
1154 * Mark block used for the block bitmap
1156 blk = ext2fs_block_bitmap_loc(fs, i);
1158 ext2fs_mark_block_bitmap2(bmap, blk);
1161 * Mark block used for the inode bitmap
1163 blk = ext2fs_inode_bitmap_loc(fs, i);
1165 ext2fs_mark_block_bitmap2(bmap, blk);
1171 * This function checks to see if a particular block (either a
1172 * superblock or a block group descriptor) overlaps with an inode or
1173 * block bitmap block, or with the inode table.
1175 static void mark_fs_metablock(ext2_resize_t rfs,
1176 ext2fs_block_bitmap meta_bmap,
1177 int group, blk64_t blk)
1179 ext2_filsys fs = rfs->new_fs;
1181 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1182 ext2fs_block_alloc_stats2(fs, blk, +1);
1185 * Check to see if we overlap with the inode or block bitmap,
1186 * or the inode tables. If not, and the block is in use, then
1187 * mark it as a block to be moved.
1189 if (is_block_bm(fs, group, blk)) {
1190 ext2fs_block_bitmap_loc_set(fs, group, 0);
1191 rfs->needed_blocks++;
1194 if (is_inode_bm(fs, group, blk)) {
1195 ext2fs_inode_bitmap_loc_set(fs, group, 0);
1196 rfs->needed_blocks++;
1199 if (is_inode_tb(fs, group, blk)) {
1200 ext2fs_inode_table_loc_set(fs, group, 0);
1201 rfs->needed_blocks++;
1204 if (ext2fs_has_feature_flex_bg(fs->super)) {
1207 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
1208 if (is_block_bm(fs, i, blk)) {
1209 ext2fs_block_bitmap_loc_set(fs, i, 0);
1210 rfs->needed_blocks++;
1213 if (is_inode_bm(fs, i, blk)) {
1214 ext2fs_inode_bitmap_loc_set(fs, i, 0);
1215 rfs->needed_blocks++;
1218 if (is_inode_tb(fs, i, blk)) {
1219 ext2fs_inode_table_loc_set(fs, i, 0);
1220 rfs->needed_blocks++;
1226 if (ext2fs_has_group_desc_csum(fs) &&
1227 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
1229 * If the block bitmap is uninitialized, which means
1230 * nothing other than standard metadata in use.
1233 } else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
1234 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1235 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1236 rfs->needed_blocks++;
1242 * This routine marks and unmarks reserved blocks in the new block
1243 * bitmap. It also determines which blocks need to be moved and
1244 * places this information into the move_blocks bitmap.
1246 static errcode_t blocks_to_move(ext2_resize_t rfs)
1249 dgrp_t i, max_groups, g;
1250 blk64_t blk, group_blk;
1251 blk64_t old_blocks, new_blocks, group_end, cluster_freed;
1253 unsigned int meta_bg, meta_bg_size;
1255 ext2_filsys fs, old_fs;
1256 ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
1260 old_fs = rfs->old_fs;
1261 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
1264 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
1269 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
1274 retval = mark_table_blocks(old_fs, meta_bmap);
1281 * If we're shrinking the filesystem, we need to move any
1282 * group's metadata blocks (either allocation bitmaps or the
1283 * inode table) which are beyond the end of the new
1286 new_size = ext2fs_blocks_count(fs->super);
1287 if (new_size < ext2fs_blocks_count(old_fs->super)) {
1288 for (g = 0; g < fs->group_desc_count; g++) {
1291 * ext2fs_allocate_group_table will re-allocate any
1292 * metadata blocks whose location is set to zero.
1294 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
1295 ext2fs_block_bitmap_loc_set(fs, g, 0);
1298 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
1299 ext2fs_inode_bitmap_loc_set(fs, g, 0);
1302 if ((ext2fs_inode_table_loc(fs, g) +
1303 fs->inode_blocks_per_group) > new_size) {
1304 ext2fs_inode_table_loc_set(fs, g, 0);
1309 retval = ext2fs_allocate_group_table(fs, g, 0);
1317 * If we're shrinking the filesystem, we need to move all of
1318 * the blocks that don't fit any more
1320 for (blk = ext2fs_blocks_count(fs->super);
1321 blk < ext2fs_blocks_count(old_fs->super); blk++) {
1322 g = ext2fs_group_of_blk2(fs, blk);
1323 if (ext2fs_has_group_desc_csum(fs) &&
1324 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
1326 * The block bitmap is uninitialized, so skip
1327 * to the next block group.
1329 blk = ext2fs_group_first_block2(fs, g+1) - 1;
1332 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1333 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1334 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1335 rfs->needed_blocks++;
1337 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1340 if (ext2fs_has_feature_meta_bg(old_fs->super))
1341 old_blocks = old_fs->super->s_first_meta_bg;
1343 old_blocks = old_fs->desc_blocks +
1344 old_fs->super->s_reserved_gdt_blocks;
1345 if (ext2fs_has_feature_meta_bg(fs->super))
1346 new_blocks = fs->super->s_first_meta_bg;
1348 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
1350 retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
1354 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
1355 EXT2_DESC_SIZE(rfs->new_fs->super) &&
1356 old_blocks == new_blocks) {
1361 max_groups = fs->group_desc_count;
1362 if (max_groups > old_fs->group_desc_count)
1363 max_groups = old_fs->group_desc_count;
1364 group_blk = old_fs->super->s_first_data_block;
1366 * If we're reducing the number of descriptor blocks, this
1367 * makes life easy. :-) We just have to mark some extra
1370 if (old_blocks > new_blocks) {
1371 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
1372 retval = ext2fs_allocate_block_bitmap(fs,
1373 _("new meta blocks"),
1378 retval = mark_table_blocks(fs, new_meta_bmap);
1383 for (i = 0; i < max_groups; i++) {
1384 if (!ext2fs_bg_has_super(old_fs, i)) {
1385 group_blk += fs->super->s_blocks_per_group;
1388 group_end = group_blk + 1 + old_blocks;
1389 for (blk = group_blk + 1 + new_blocks;
1391 if (new_meta_bmap == NULL ||
1392 !ext2fs_test_block_bitmap2(new_meta_bmap,
1395 EXT2FS_CLUSTER_RATIO(fs) -
1397 EXT2FS_CLUSTER_MASK(fs));
1398 if (cluster_freed > group_end - blk)
1399 cluster_freed = group_end - blk;
1400 ext2fs_block_alloc_stats2(fs, blk, -1);
1401 blk += EXT2FS_CLUSTER_RATIO(fs);
1402 rfs->needed_blocks -= cluster_freed;
1405 rfs->needed_blocks--;
1408 group_blk += fs->super->s_blocks_per_group;
1414 * If we're increasing the number of descriptor blocks, life
1415 * gets interesting....
1417 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
1418 flex_bg = ext2fs_has_feature_flex_bg(fs->super);
1419 /* first reserve all of the existing fs meta blocks */
1420 for (i = 0; i < max_groups; i++) {
1421 has_super = ext2fs_bg_has_super(fs, i);
1423 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
1425 meta_bg = i / meta_bg_size;
1426 if (!ext2fs_has_feature_meta_bg(fs->super) ||
1427 (meta_bg < fs->super->s_first_meta_bg)) {
1429 for (blk = group_blk+1;
1430 blk < group_blk + 1 + new_blocks; blk++)
1431 mark_fs_metablock(rfs, meta_bmap,
1437 if (((i % meta_bg_size) == 0) ||
1438 ((i % meta_bg_size) == 1) ||
1439 ((i % meta_bg_size) == (meta_bg_size-1)))
1440 mark_fs_metablock(rfs, meta_bmap, i,
1441 group_blk + has_super);
1445 * Reserve the existing meta blocks that we know
1446 * aren't to be moved.
1448 * For flex_bg file systems, in order to avoid
1449 * overwriting fs metadata (especially inode table
1450 * blocks) belonging to a different block group when
1451 * we are relocating the inode tables, we need to
1452 * reserve all existing fs metadata blocks.
1454 if (ext2fs_block_bitmap_loc(fs, i))
1455 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1456 ext2fs_block_bitmap_loc(fs, i));
1457 else if (flex_bg && i < old_fs->group_desc_count)
1458 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1459 ext2fs_block_bitmap_loc(old_fs, i));
1461 if (ext2fs_inode_bitmap_loc(fs, i))
1462 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1463 ext2fs_inode_bitmap_loc(fs, i));
1464 else if (flex_bg && i < old_fs->group_desc_count)
1465 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1466 ext2fs_inode_bitmap_loc(old_fs, i));
1468 if (ext2fs_inode_table_loc(fs, i))
1469 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1470 ext2fs_inode_table_loc(fs, i),
1471 fs->inode_blocks_per_group);
1472 else if (flex_bg && i < old_fs->group_desc_count)
1473 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1474 ext2fs_inode_table_loc(old_fs, i),
1475 old_fs->inode_blocks_per_group);
1477 group_blk += rfs->new_fs->super->s_blocks_per_group;
1480 /* Allocate the missing data structures */
1481 for (i = 0; i < max_groups; i++) {
1482 if (ext2fs_inode_table_loc(fs, i) &&
1483 ext2fs_inode_bitmap_loc(fs, i) &&
1484 ext2fs_block_bitmap_loc(fs, i))
1487 retval = ext2fs_allocate_group_table(fs, i,
1488 rfs->reserve_blocks);
1493 * For those structures that have changed, we need to
1496 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1497 (blk = ext2fs_block_bitmap_loc(fs, i))) {
1498 ext2fs_block_alloc_stats2(fs, blk, +1);
1499 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1500 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1501 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1504 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1505 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1506 ext2fs_block_alloc_stats2(fs, blk, +1);
1507 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1508 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1509 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1514 * The inode table, if we need to relocate it, is
1515 * handled specially. We have to reserve the blocks
1516 * for both the old and the new inode table, since we
1517 * can't have the inode table be destroyed during the
1518 * block relocation phase.
1520 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1521 continue; /* inode table not moved */
1523 rfs->needed_blocks += fs->inode_blocks_per_group;
1526 * Mark the new inode table as in use in the new block
1527 * allocation bitmap, and move any blocks that might
1530 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1531 j < fs->inode_blocks_per_group ; j++, blk++) {
1532 ext2fs_block_alloc_stats2(fs, blk, +1);
1533 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1534 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1535 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1540 * Make sure the old inode table is reserved in the
1541 * block reservation bitmap.
1543 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1544 j < fs->inode_blocks_per_group ; j++, blk++)
1545 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1551 ext2fs_free_block_bitmap(new_meta_bmap);
1553 ext2fs_free_block_bitmap(meta_bmap);
1559 * This helper function tries to allocate a new block. We try to
1560 * avoid hitting the original group descriptor blocks at least at
1561 * first, since we want to make it possible to recover from a badly
1562 * aborted resize operation as much as possible.
1564 * In the future, I may further modify this routine to balance out
1565 * where we get the new blocks across the various block groups.
1566 * Ideally we would allocate blocks that corresponded with the block
1567 * group of the containing inode, and keep contiguous blocks
1568 * together. However, this very difficult to do efficiently, since we
1569 * don't have the necessary information up front.
1573 #define DESPERATION 2
1575 static void init_block_alloc(ext2_resize_t rfs)
1577 rfs->alloc_state = AVOID_OLD;
1578 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1580 /* HACK for testing */
1581 if (ext2fs_blocks_count(rfs->new_fs->super) >
1582 ext2fs_blocks_count(rfs->old_fs->super))
1583 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1587 static blk64_t get_new_block(ext2_resize_t rfs)
1589 ext2_filsys fs = rfs->new_fs;
1592 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1593 if (rfs->alloc_state == DESPERATION)
1596 #ifdef RESIZE2FS_DEBUG
1597 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1598 printf("Going into desperation mode "
1599 "for block allocations\n");
1601 rfs->alloc_state = DESPERATION;
1602 rfs->new_blk = fs->super->s_first_data_block;
1605 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1606 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1608 ((rfs->alloc_state == AVOID_OLD) &&
1609 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1610 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1615 return rfs->new_blk;
1619 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
1620 blk64_t goal EXT2FS_ATTR((unused)),
1623 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1626 blk = get_new_block(rfs);
1630 #ifdef RESIZE2FS_DEBUG
1631 if (rfs->flags & 0xF)
1632 printf("get_alloc_block allocating %llu\n", blk);
1635 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1636 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1637 *ret = (blk64_t) blk;
1641 static errcode_t block_mover(ext2_resize_t rfs)
1643 blk64_t blk, old_blk, new_blk;
1644 ext2_filsys fs = rfs->new_fs;
1645 ext2_filsys old_fs = rfs->old_fs;
1650 ext2_badblocks_list badblock_list = 0;
1651 int bb_modified = 0;
1653 fs->get_alloc_block = resize2fs_get_alloc_block;
1654 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1656 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1660 new_blk = fs->super->s_first_data_block;
1661 if (!rfs->itable_buf) {
1662 retval = ext2fs_get_array(fs->blocksize,
1663 fs->inode_blocks_per_group,
1668 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1673 * The first step is to figure out where all of the blocks
1676 to_move = moved = 0;
1677 init_block_alloc(rfs);
1678 for (blk = B2C(old_fs->super->s_first_data_block);
1679 blk < ext2fs_blocks_count(old_fs->super);
1680 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1681 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1683 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1685 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1686 ext2fs_badblocks_list_del(badblock_list, blk);
1691 new_blk = get_new_block(rfs);
1696 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1697 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1703 ext2fs_free_extent_table(rfs->bmap);
1711 * Step two is to actually move the blocks
1713 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1714 if (retval) goto errout;
1716 if (rfs->progress) {
1717 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1723 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1724 if (retval) goto errout;
1727 old_blk = C2B(old_blk);
1728 new_blk = C2B(new_blk);
1730 #ifdef RESIZE2FS_DEBUG
1731 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1732 printf("Moving %llu blocks %llu->%llu\n",
1733 size, old_blk, new_blk);
1737 if (c > fs->inode_blocks_per_group)
1738 c = fs->inode_blocks_per_group;
1739 retval = io_channel_read_blk64(fs->io, old_blk, c,
1741 if (retval) goto errout;
1742 retval = io_channel_write_blk64(fs->io, new_blk, c,
1744 if (retval) goto errout;
1749 if (rfs->progress) {
1750 io_channel_flush(fs->io);
1751 retval = (rfs->progress)(rfs,
1752 E2_RSZ_BLOCK_RELOC_PASS,
1758 io_channel_flush(fs->io);
1762 if (badblock_list) {
1763 if (!retval && bb_modified)
1764 retval = ext2fs_update_bb_inode(old_fs,
1766 ext2fs_badblocks_list_free(badblock_list);
1772 /* --------------------------------------------------------------------
1774 * Resize processing, phase 3
1776 * --------------------------------------------------------------------
1781 * The extent translation table is stored in clusters so we need to
1782 * take special care when mapping a source block number to its
1783 * destination block number.
1785 static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1787 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1790 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1794 struct process_block_struct {
1798 struct ext2_inode * inode;
1805 static int process_block(ext2_filsys fs, blk64_t *block_nr,
1806 e2_blkcnt_t blockcnt,
1807 blk64_t ref_block EXT2FS_ATTR((unused)),
1808 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1810 struct process_block_struct *pb;
1812 blk64_t block, new_block;
1815 pb = (struct process_block_struct *) priv_data;
1817 if (pb->rfs->bmap) {
1818 new_block = extent_translate(fs, pb->rfs->bmap, block);
1820 *block_nr = new_block;
1821 ret |= BLOCK_CHANGED;
1823 #ifdef RESIZE2FS_DEBUG
1824 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1825 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1826 pb->old_ino, blockcnt, block,
1834 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1835 block, (int) blockcnt);
1847 static errcode_t progress_callback(ext2_filsys fs,
1848 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1849 dgrp_t group, void * priv_data)
1851 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1855 * This check is to protect against old ext2 libraries. It
1856 * shouldn't be needed against new libraries.
1861 if (rfs->progress) {
1862 io_channel_flush(fs->io);
1863 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1864 group+1, fs->group_desc_count);
1872 static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
1873 struct ext2_inode *inode, int *changed)
1879 /* No EA block or no remapping? Quit early. */
1880 if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 && !rfs->bmap)
1882 new_block = extent_translate(rfs->old_fs, rfs->bmap,
1883 ext2fs_file_acl_block(rfs->old_fs, inode));
1887 /* Set the new ACL block */
1888 ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
1890 /* Update checksum */
1891 if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
1892 err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
1895 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
1896 err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
1897 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
1900 err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
1907 ext2fs_free_mem(&buf);
1911 /* Rewrite extents */
1912 static errcode_t rewrite_extents(ext2_filsys fs, ext2_ino_t ino)
1914 ext2_extent_handle_t handle;
1915 struct ext2fs_extent extent;
1917 struct ext2_extent_info info;
1919 errcode = ext2fs_extent_open(fs, ino, &handle);
1923 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent);
1928 errcode = ext2fs_extent_get_info(handle, &info);
1933 * If this is the first extent in an extent block that we
1934 * haven't visited, rewrite the extent to force the ETB
1935 * checksum to be rewritten.
1937 if (info.curr_entry == 1 && info.curr_level != 0 &&
1938 !(extent.e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT)) {
1939 errcode = ext2fs_extent_replace(handle, 0, &extent);
1944 /* Skip to the end of a block of leaf nodes */
1945 if (extent.e_flags & EXT2_EXTENT_FLAGS_LEAF) {
1946 errcode = ext2fs_extent_get(handle,
1947 EXT2_EXTENT_LAST_SIB,
1953 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT, &extent);
1954 } while (errcode == 0);
1957 /* Ok if we run off the end */
1958 if (errcode == EXT2_ET_EXTENT_NO_NEXT)
1960 ext2fs_extent_free(handle);
1964 static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
1965 errcode_t code EXT2FS_ATTR((unused)),
1966 const char *fmt EXT2FS_ATTR((unused)),
1967 va_list args EXT2FS_ATTR((unused)))
1971 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1973 struct process_block_struct pb;
1974 ext2_ino_t ino, new_inode;
1975 struct ext2_inode *inode = NULL;
1976 ext2_inode_scan scan = NULL;
1978 char *block_buf = 0;
1979 ext2_ino_t start_to_move;
1982 if ((rfs->old_fs->group_desc_count <=
1983 rfs->new_fs->group_desc_count) &&
1987 set_com_err_hook(quiet_com_err_proc);
1989 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1990 if (retval) goto errout;
1992 retval = ext2fs_init_dblist(rfs->old_fs, 0);
1993 if (retval) goto errout;
1994 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
1995 if (retval) goto errout;
1997 start_to_move = (rfs->new_fs->group_desc_count *
1998 rfs->new_fs->super->s_inodes_per_group);
2000 if (rfs->progress) {
2001 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
2002 0, rfs->old_fs->group_desc_count);
2006 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
2010 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
2011 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
2012 inode = malloc(inode_size);
2018 * First, copy all of the inodes that need to be moved
2019 * elsewhere in the inode table
2022 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
2023 if (retval) goto errout;
2027 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2028 continue; /* inode not in use */
2030 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
2033 /* Remap EA block */
2034 retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
2039 if (ino <= start_to_move)
2040 goto remap_blocks; /* Don't need to move inode. */
2043 * Find a new inode. Now that extents and directory blocks
2044 * are tied to the inode number through the checksum, we must
2045 * set up the new inode before we start rewriting blocks.
2047 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
2051 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
2053 inode->i_ctime = time(0);
2054 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
2060 #ifdef RESIZE2FS_DEBUG
2061 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
2062 printf("Inode moved %u->%u\n", ino, new_inode);
2065 retval = ext2fs_create_extent_table(&rfs->imap, 0);
2069 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
2073 retval = ext2fs_write_inode_full(rfs->old_fs,
2079 /* Rewrite extent block checksums with new inode number */
2080 if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
2081 (inode->i_flags & EXT4_EXTENTS_FL)) {
2082 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2083 retval = rewrite_extents(rfs->old_fs, new_inode);
2084 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2090 * Update inodes to point to new blocks; schedule directory
2091 * blocks for inode remapping. Need to write out dir blocks
2092 * with new inode numbers if we have metadata_csum enabled.
2094 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
2095 (rfs->bmap || pb.is_dir)) {
2098 pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
2099 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2100 retval = ext2fs_block_iterate3(rfs->old_fs,
2101 new_inode, 0, block_buf,
2102 process_block, &pb);
2103 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2110 } else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
2111 (rfs->bmap || pb.is_dir)) {
2112 /* inline data dir; update it too */
2113 retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
2119 io_channel_flush(rfs->old_fs->io);
2122 reset_com_err_hook();
2124 ext2fs_free_extent_table(rfs->bmap);
2128 ext2fs_close_inode_scan(scan);
2130 ext2fs_free_mem(&block_buf);
2135 /* --------------------------------------------------------------------
2137 * Resize processing, phase 4.
2139 * --------------------------------------------------------------------
2145 unsigned int max_dirs;
2149 static int check_and_change_inodes(ext2_ino_t dir,
2150 int entry EXT2FS_ATTR((unused)),
2151 struct ext2_dir_entry *dirent, int offset,
2152 int blocksize EXT2FS_ATTR((unused)),
2153 char *buf EXT2FS_ATTR((unused)),
2156 struct istruct *is = (struct istruct *) priv_data;
2157 struct ext2_inode inode;
2158 ext2_ino_t new_inode;
2162 if (is->rfs->progress && offset == 0) {
2163 io_channel_flush(is->rfs->old_fs->io);
2164 is->err = (is->rfs->progress)(is->rfs,
2165 E2_RSZ_INODE_REF_UPD_PASS,
2166 ++is->num, is->max_dirs);
2168 return DIRENT_ABORT;
2172 * If we have checksums enabled and the inode wasn't present in the
2173 * old fs, then we must rewrite all dir blocks with new checksums.
2175 if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
2176 !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
2177 ret |= DIRENT_CHANGED;
2182 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
2186 #ifdef RESIZE2FS_DEBUG
2187 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
2188 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2189 dir, ext2fs_dirent_name_len(dirent), dirent->name,
2190 dirent->inode, new_inode);
2193 dirent->inode = new_inode;
2195 /* Update the directory mtime and ctime */
2196 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
2198 inode.i_mtime = inode.i_ctime = time(0);
2199 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
2201 return ret | DIRENT_ABORT;
2204 return ret | DIRENT_CHANGED;
2207 static errcode_t inode_ref_fix(ext2_resize_t rfs)
2216 * Now, we iterate over all of the directories to update the
2220 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
2224 if (rfs->progress) {
2225 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2231 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2232 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
2233 DIRENT_FLAG_INCLUDE_EMPTY, 0,
2234 check_and_change_inodes, &is);
2235 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2243 if (rfs->progress && (is.num < is.max_dirs))
2244 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2245 is.max_dirs, is.max_dirs);
2248 ext2fs_free_extent_table(rfs->imap);
2254 /* --------------------------------------------------------------------
2256 * Resize processing, phase 5.
2258 * In this phase we actually move the inode table around, and then
2259 * update the summary statistics. This is scary, since aborting here
2260 * will potentially scramble the filesystem. (We are moving the
2261 * inode tables around in place, and so the potential for lost data,
2262 * or at the very least scrambling the mapping between filenames and
2263 * inode numbers is very high in case of a power failure here.)
2264 * --------------------------------------------------------------------
2269 * A very scary routine --- this one moves the inode table around!!!
2271 * After this you have to use the rfs->new_fs file handle to read and
2274 static errcode_t move_itables(ext2_resize_t rfs)
2278 dgrp_t i, max_groups;
2279 ext2_filsys fs = rfs->new_fs;
2281 blk64_t old_blk, new_blk, blk, cluster_freed;
2283 int j, to_move, moved;
2284 ext2fs_block_bitmap new_bmap = NULL;
2286 max_groups = fs->group_desc_count;
2287 if (max_groups > rfs->old_fs->group_desc_count)
2288 max_groups = rfs->old_fs->group_desc_count;
2290 size = fs->blocksize * fs->inode_blocks_per_group;
2291 if (!rfs->itable_buf) {
2292 retval = ext2fs_get_mem(size, &rfs->itable_buf);
2297 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
2298 retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
2303 retval = mark_table_blocks(fs, new_bmap);
2309 * Figure out how many inode tables we need to move
2311 to_move = moved = 0;
2312 for (i=0; i < max_groups; i++)
2313 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
2314 ext2fs_inode_table_loc(fs, i))
2322 if (rfs->progress) {
2323 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2329 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
2331 for (i=0; i < max_groups; i++) {
2332 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
2333 new_blk = ext2fs_inode_table_loc(fs, i);
2334 diff = new_blk - old_blk;
2336 #ifdef RESIZE2FS_DEBUG
2337 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2338 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2339 i, old_blk, new_blk, diff);
2347 retval = io_channel_read_blk64(fs->io, old_blk,
2348 fs->inode_blocks_per_group,
2353 * The end of the inode table segment often contains
2354 * all zeros, and we're often only moving the inode
2355 * table down a block or two. If so, we can optimize
2356 * things by not rewriting blocks that we know to be zero
2359 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
2362 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
2363 #ifdef RESIZE2FS_DEBUG
2364 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2365 printf("%d blocks of zeros...\n", n);
2367 num = fs->inode_blocks_per_group;
2371 retval = io_channel_write_blk64(fs->io, new_blk,
2372 num, rfs->itable_buf);
2374 io_channel_write_blk64(fs->io, old_blk,
2375 num, rfs->itable_buf);
2379 retval = io_channel_write_blk64(fs->io,
2380 old_blk + fs->inode_blocks_per_group,
2381 diff, (rfs->itable_buf +
2382 (fs->inode_blocks_per_group - diff) *
2388 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
2389 j < fs->inode_blocks_per_group;) {
2390 if (new_bmap == NULL ||
2391 !ext2fs_test_block_bitmap2(new_bmap, blk)) {
2392 ext2fs_block_alloc_stats2(fs, blk, -1);
2393 cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
2394 (blk & EXT2FS_CLUSTER_MASK(fs));
2395 blk += cluster_freed;
2403 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
2404 ext2fs_group_desc_csum_set(rfs->old_fs, i);
2405 ext2fs_mark_super_dirty(rfs->old_fs);
2406 ext2fs_flush(rfs->old_fs);
2408 if (rfs->progress) {
2409 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2415 mark_table_blocks(fs, fs->block_map);
2417 #ifdef RESIZE2FS_DEBUG
2418 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2419 printf("Inode table move finished.\n");
2425 ext2fs_free_block_bitmap(new_bmap);
2430 * This function is used when expanding a file system. It frees the
2431 * superblock and block group descriptor blocks from the block group
2432 * which is no longer the last block group.
2434 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
2436 ext2_filsys fs = rfs->new_fs;
2437 ext2_filsys old_fs = rfs->old_fs;
2439 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2440 dgrp_t last_bg = fs->group_desc_count - 1;
2441 blk64_t sb, old_desc;
2444 if (!ext2fs_has_feature_sparse_super2(fs->super))
2447 if (last_bg <= old_last_bg)
2450 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2451 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2454 if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
2455 old_fs->super->s_backup_bgs[1] != old_last_bg)
2458 if (fs->super->s_backup_bgs[0] == old_last_bg ||
2459 fs->super->s_backup_bgs[1] == old_last_bg)
2462 retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
2463 &sb, &old_desc, NULL, &num);
2468 ext2fs_unmark_block_bitmap2(fs->block_map, sb);
2470 ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
2475 * This function is used when shrinking a file system. We need to
2476 * utilize blocks from what will be the new last block group for the
2477 * backup superblock and block group descriptor blocks.
2478 * Unfortunately, those blocks may be used by other files or fs
2479 * metadata blocks. We need to mark them as being in use.
2481 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
2482 ext2fs_block_bitmap meta_bmap)
2484 ext2_filsys fs = rfs->new_fs;
2485 ext2_filsys old_fs = rfs->old_fs;
2487 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2488 dgrp_t last_bg = fs->group_desc_count - 1;
2490 blk64_t blk, sb, old_desc;
2494 if (!ext2fs_has_feature_sparse_super2(fs->super))
2497 if (last_bg >= old_last_bg)
2500 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2501 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2504 if (fs->super->s_backup_bgs[0] != last_bg &&
2505 fs->super->s_backup_bgs[1] != last_bg)
2508 if (old_fs->super->s_backup_bgs[0] == last_bg ||
2509 old_fs->super->s_backup_bgs[1] == last_bg)
2512 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
2513 &sb, &old_desc, NULL, &num);
2517 if (last_bg && !sb) {
2518 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2522 if (old_desc && old_desc != sb+1) {
2523 fputs(_("Should never happen! Unexpected old_desc in "
2524 "super_sparse bg?\n"),
2528 num = (old_desc) ? num : 1;
2530 /* Reserve the backup blocks */
2531 ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
2533 for (g = 0; g < fs->group_desc_count; g++) {
2536 mb = ext2fs_block_bitmap_loc(fs, g);
2537 if ((mb >= sb) && (mb < sb + num)) {
2538 ext2fs_block_bitmap_loc_set(fs, g, 0);
2541 mb = ext2fs_inode_bitmap_loc(fs, g);
2542 if ((mb >= sb) && (mb < sb + num)) {
2543 ext2fs_inode_bitmap_loc_set(fs, g, 0);
2546 mb = ext2fs_inode_table_loc(fs, g);
2547 if ((mb < sb + num) &&
2548 (sb < mb + fs->inode_blocks_per_group)) {
2549 ext2fs_inode_table_loc_set(fs, g, 0);
2553 retval = ext2fs_allocate_group_table(fs, g, 0);
2559 for (blk = sb, i = 0; i < num; blk++, i++) {
2560 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
2561 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
2562 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
2563 rfs->needed_blocks++;
2565 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
2571 * Fix the resize inode
2573 static errcode_t fix_resize_inode(ext2_filsys fs)
2575 struct ext2_inode inode;
2578 if (!ext2fs_has_feature_resize_inode(fs->super))
2581 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
2582 if (retval) goto errout;
2584 ext2fs_iblk_set(fs, &inode, 1);
2586 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
2587 if (retval) goto errout;
2589 if (!inode.i_block[EXT2_DIND_BLOCK]) {
2591 * Avoid zeroing out block #0; that's rude. This
2592 * should never happen anyway since the filesystem
2593 * should be fsck'ed and we assume it is consistent.
2595 fprintf(stderr, "%s",
2596 _("Should never happen: resize inode corrupt!\n"));
2600 retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
2605 retval = ext2fs_create_resize_inode(fs);
2614 * Finally, recalculate the summary information
2616 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
2620 unsigned int group = 0;
2621 unsigned int count = 0;
2622 blk64_t total_blocks_free = 0;
2623 int total_inodes_free = 0;
2626 blk64_t super_blk, old_desc_blk, new_desc_blk;
2627 int old_desc_blocks;
2630 * First calculate the block statistics
2632 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2633 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
2635 if (ext2fs_has_feature_meta_bg(fs->super))
2636 old_desc_blocks = fs->super->s_first_meta_bg;
2638 old_desc_blocks = fs->desc_blocks +
2639 fs->super->s_reserved_gdt_blocks;
2640 for (blk = B2C(fs->super->s_first_data_block);
2641 blk < ext2fs_blocks_count(fs->super);
2642 blk += EXT2FS_CLUSTER_RATIO(fs)) {
2644 !(EQ_CLSTR(blk, super_blk) ||
2645 ((old_desc_blk && old_desc_blocks &&
2646 GE_CLSTR(blk, old_desc_blk) &&
2647 LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
2648 ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
2649 EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
2650 EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
2651 ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
2652 LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
2653 + fs->inode_blocks_per_group))))) ||
2654 (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
2656 total_blocks_free++;
2659 if ((count == fs->super->s_clusters_per_group) ||
2660 EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
2661 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
2662 ext2fs_group_desc_csum_set(fs, group);
2664 if (group >= fs->group_desc_count)
2668 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2669 ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
2672 if (ext2fs_has_feature_meta_bg(fs->super))
2673 old_desc_blocks = fs->super->s_first_meta_bg;
2675 old_desc_blocks = fs->desc_blocks +
2676 fs->super->s_reserved_gdt_blocks;
2679 total_blocks_free = C2B(total_blocks_free);
2680 ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
2683 * Next, calculate the inode statistics
2689 /* Protect loop from wrap-around if s_inodes_count maxed */
2690 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2691 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
2693 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
2695 total_inodes_free++;
2698 if ((count == fs->super->s_inodes_per_group) ||
2699 (ino == fs->super->s_inodes_count)) {
2700 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
2701 ext2fs_group_desc_csum_set(fs, group);
2703 if (group >= fs->group_desc_count)
2707 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2710 fs->super->s_free_inodes_count = total_inodes_free;
2711 ext2fs_mark_super_dirty(fs);
2716 * Journal may have been relocated; update the backup journal blocks
2717 * in the superblock.
2719 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
2722 struct ext2_inode inode;
2724 if (!ext2fs_has_feature_journal(fs->super))
2727 /* External journal? Nothing to do. */
2728 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2731 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2734 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2735 fs->super->s_jnl_blocks[15] = inode.i_size_high;
2736 fs->super->s_jnl_blocks[16] = inode.i_size;
2737 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2738 ext2fs_mark_super_dirty(fs);
2742 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2743 int old_desc_blocks)
2745 blk64_t super_blk, old_desc_blk, new_desc_blk;
2748 /* inode table blocks plus allocation bitmaps */
2749 overhead = fs->inode_blocks_per_group + 2;
2751 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2752 &old_desc_blk, &new_desc_blk, 0);
2753 if ((grp == 0) || super_blk)
2756 overhead += old_desc_blocks;
2757 else if (new_desc_blk)
2764 * calcluate the minimum number of blocks the given fs can be resized to
2766 blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
2768 ext2_ino_t inode_count;
2769 dgrp_t groups, flex_groups;
2770 blk64_t blks_needed, data_blocks;
2771 blk64_t grp, data_needed, last_start;
2772 blk64_t overhead = 0;
2773 int old_desc_blocks;
2774 int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2777 * first figure out how many group descriptors we need to
2778 * handle the number of inodes we have
2780 inode_count = fs->super->s_inodes_count -
2781 fs->super->s_free_inodes_count;
2782 blks_needed = ext2fs_div_ceil(inode_count,
2783 fs->super->s_inodes_per_group) *
2784 (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
2785 groups = ext2fs_div64_ceil(blks_needed,
2786 EXT2_BLOCKS_PER_GROUP(fs->super));
2787 #ifdef RESIZE2FS_DEBUG
2788 if (flags & RESIZE_DEBUG_MIN_CALC)
2789 printf("fs has %d inodes, %d groups required.\n",
2790 inode_count, groups);
2794 * number of old-style block group descriptor blocks
2796 if (ext2fs_has_feature_meta_bg(fs->super))
2797 old_desc_blocks = fs->super->s_first_meta_bg;
2799 old_desc_blocks = fs->desc_blocks +
2800 fs->super->s_reserved_gdt_blocks;
2802 /* calculate how many blocks are needed for data */
2803 data_needed = ext2fs_blocks_count(fs->super) -
2804 ext2fs_free_blocks_count(fs->super);
2806 for (grp = 0; grp < fs->group_desc_count; grp++)
2807 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
2808 #ifdef RESIZE2FS_DEBUG
2809 if (flags & RESIZE_DEBUG_MIN_CALC)
2810 printf("fs requires %llu data blocks.\n", data_needed);
2814 * For ext4 we need to allow for up to a flex_bg worth of
2815 * inode tables of slack space so the resize operation can be
2816 * guaranteed to finish.
2818 flex_groups = groups;
2819 if (ext2fs_has_feature_flex_bg(fs->super)) {
2820 dgrp_t remainder = groups & (flexbg_size - 1);
2822 flex_groups += flexbg_size - remainder;
2823 if (flex_groups > fs->group_desc_count)
2824 flex_groups = fs->group_desc_count;
2828 * figure out how many data blocks we have given the number of groups
2829 * we need for our inodes
2831 data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
2833 for (grp = 0; grp < flex_groups; grp++) {
2834 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
2837 * we want to keep track of how much data we can store in
2838 * the groups leading up to the last group so we can determine
2839 * how big the last group needs to be
2841 if (grp < (groups - 1))
2842 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
2845 if (data_blocks > overhead)
2846 data_blocks -= overhead;
2850 #ifdef RESIZE2FS_DEBUG
2851 if (flags & RESIZE_DEBUG_MIN_CALC)
2852 printf("With %d group(s), we have %llu blocks available.\n",
2853 groups, data_blocks);
2857 * if we need more group descriptors in order to accomodate our data
2858 * then we need to add them here
2860 blks_needed = data_needed;
2861 while (blks_needed > data_blocks) {
2862 blk64_t remainder = blks_needed - data_blocks;
2865 /* figure out how many more groups we need for the data */
2866 extra_grps = ext2fs_div64_ceil(remainder,
2867 EXT2_BLOCKS_PER_GROUP(fs->super));
2869 data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
2871 /* ok we have to account for the last group */
2872 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2873 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
2876 groups += extra_grps;
2877 if (!ext2fs_has_feature_flex_bg(fs->super))
2878 flex_groups = groups;
2879 else if (groups > flex_groups) {
2880 dgrp_t r = groups & (flexbg_size - 1);
2882 flex_groups = groups + flexbg_size - r;
2883 if (flex_groups > fs->group_desc_count)
2884 flex_groups = fs->group_desc_count;
2887 for (; grp < flex_groups; grp++) {
2888 overhead = calc_group_overhead(fs, grp,
2892 * again, we need to see how much data we cram into
2893 * all of the groups leading up to the last group
2895 if (grp < groups - 1)
2896 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
2899 data_blocks -= overhead;
2902 #ifdef RESIZE2FS_DEBUG
2903 if (flags & RESIZE_DEBUG_MIN_CALC)
2904 printf("Added %d extra group(s), "
2905 "blks_needed %llu, data_blocks %llu, "
2906 "last_start %llu\n", extra_grps, blks_needed,
2907 data_blocks, last_start);
2911 /* now for the fun voodoo */
2913 if (ext2fs_has_feature_flex_bg(fs->super) &&
2914 (grp & ~(flexbg_size - 1)) == 0)
2915 grp = grp & ~(flexbg_size - 1);
2917 for (; grp < flex_groups; grp++)
2918 overhead += calc_group_overhead(fs, grp, old_desc_blocks);
2920 #ifdef RESIZE2FS_DEBUG
2921 if (flags & RESIZE_DEBUG_MIN_CALC)
2922 printf("Last group's overhead is %llu\n", overhead);
2926 * if this is the case then the last group is going to have data in it
2927 * so we need to adjust the size of the last group accordingly
2929 if (last_start < blks_needed) {
2930 blk64_t remainder = blks_needed - last_start;
2932 #ifdef RESIZE2FS_DEBUG
2933 if (flags & RESIZE_DEBUG_MIN_CALC)
2934 printf("Need %llu data blocks in last group\n",
2938 * 50 is a magic number that mkfs/resize uses to see if its
2939 * even worth making/resizing the fs. basically you need to
2940 * have at least 50 blocks in addition to the blocks needed
2941 * for the metadata in the last group
2944 overhead += remainder;
2950 overhead += fs->super->s_first_data_block;
2951 #ifdef RESIZE2FS_DEBUG
2952 if (flags & RESIZE_DEBUG_MIN_CALC)
2953 printf("Final size of last group is %lld\n", overhead);
2956 /* Add extra slack for bigalloc file systems */
2957 if (EXT2FS_CLUSTER_RATIO(fs) > 1)
2958 overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
2961 * since our last group doesn't have to be BLOCKS_PER_GROUP
2962 * large, we only do groups-1, and then add the number of
2963 * blocks needed to handle the group descriptor metadata+data
2966 blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
2967 blks_needed += overhead;
2970 * Make sure blks_needed covers the end of the inode table in
2971 * the last block group.
2973 overhead = ext2fs_inode_table_loc(fs, groups-1) +
2974 fs->inode_blocks_per_group;
2975 if (blks_needed < overhead)
2976 blks_needed = overhead;
2978 #ifdef RESIZE2FS_DEBUG
2979 if (flags & RESIZE_DEBUG_MIN_CALC)
2980 printf("Estimated blocks needed: %llu\n", blks_needed);
2984 * If at this point we've already added up more "needed" than
2985 * the current size, just return current size as minimum.
2987 if (blks_needed >= ext2fs_blocks_count(fs->super))
2988 return ext2fs_blocks_count(fs->super);
2990 * We need to reserve a few extra blocks if extents are
2991 * enabled, in case we need to grow the extent tree. The more
2992 * we shrink the file system, the more space we need.
2994 * The absolute worst case is every single data block is in
2995 * the part of the file system that needs to be evacuated,
2996 * with each data block needs to be in its own extent, and
2997 * with each inode needing at least one extent block.
2999 if (ext2fs_has_feature_extents(fs->super)) {
3000 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
3002 unsigned int exts_per_blk = (fs->blocksize /
3003 sizeof(struct ext3_extent)) - 1;
3004 blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
3007 if (worst_case < inode_count)
3008 worst_case = inode_count;
3010 if (safe_margin > worst_case)
3011 safe_margin = worst_case;
3013 #ifdef RESIZE2FS_DEBUG
3014 if (flags & RESIZE_DEBUG_MIN_CALC)
3015 printf("Extents safety margin: %llu\n", safe_margin);
3017 blks_needed += safe_margin;