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);
58 * Some helper CPP macros
60 #define IS_BLOCK_BM(fs, i, blk) ((blk) == ext2fs_block_bitmap_loc((fs),(i)))
61 #define IS_INODE_BM(fs, i, blk) ((blk) == ext2fs_inode_bitmap_loc((fs),(i)))
63 #define IS_INODE_TB(fs, i, blk) (((blk) >= ext2fs_inode_table_loc((fs), (i))) && \
64 ((blk) < (ext2fs_inode_table_loc((fs), (i)) + \
65 (fs)->inode_blocks_per_group)))
67 /* Some bigalloc helper macros which are more succint... */
68 #define B2C(x) EXT2FS_B2C(fs, (x))
69 #define C2B(x) EXT2FS_C2B(fs, (x))
70 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
71 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
72 #define LT_CLSTR(x, y) (B2C(x) < B2C(y))
73 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
74 #define GT_CLSTR(x, y) (B2C(x) > B2C(y))
79 * This is the top-level routine which does the dirty deed....
81 errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
82 errcode_t (*progress)(ext2_resize_t rfs, int pass,
84 unsigned long max_val))
88 struct resource_track rtrack, overall_track;
91 * Create the data structure
93 retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
97 memset(rfs, 0, sizeof(struct ext2_resize_struct));
102 rfs->progress = progress;
104 init_resource_track(&overall_track, "overall resize2fs", fs->io);
105 init_resource_track(&rtrack, "read_bitmaps", fs->io);
106 retval = ext2fs_read_bitmaps(fs);
109 print_resource_track(rfs, &rtrack, fs->io);
111 fs->super->s_state |= EXT2_ERROR_FS;
112 ext2fs_mark_super_dirty(fs);
115 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 1", fs->io);
116 fix_uninit_block_bitmaps(fs);
117 print_resource_track(rfs, &rtrack, fs->io);
118 retval = ext2fs_dup_handle(fs, &rfs->new_fs);
122 init_resource_track(&rtrack, "adjust_superblock", fs->io);
123 retval = adjust_superblock(rfs, *new_size);
126 print_resource_track(rfs, &rtrack, fs->io);
129 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
130 fix_uninit_block_bitmaps(rfs->new_fs);
131 print_resource_track(rfs, &rtrack, fs->io);
132 /* Clear the block bitmap uninit flag for the last block group */
133 ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
134 EXT2_BG_BLOCK_UNINIT);
136 *new_size = ext2fs_blocks_count(rfs->new_fs->super);
138 init_resource_track(&rtrack, "blocks_to_move", fs->io);
139 retval = blocks_to_move(rfs);
142 print_resource_track(rfs, &rtrack, fs->io);
144 #ifdef RESIZE2FS_DEBUG
145 if (rfs->flags & RESIZE_DEBUG_BMOVE)
146 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
147 ext2fs_free_blocks_count(rfs->old_fs->super),
148 ext2fs_free_blocks_count(rfs->new_fs->super),
152 init_resource_track(&rtrack, "block_mover", fs->io);
153 retval = block_mover(rfs);
156 print_resource_track(rfs, &rtrack, fs->io);
158 init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
159 retval = inode_scan_and_fix(rfs);
162 print_resource_track(rfs, &rtrack, fs->io);
164 init_resource_track(&rtrack, "inode_ref_fix", fs->io);
165 retval = inode_ref_fix(rfs);
168 print_resource_track(rfs, &rtrack, fs->io);
170 init_resource_track(&rtrack, "move_itables", fs->io);
171 retval = move_itables(rfs);
174 print_resource_track(rfs, &rtrack, fs->io);
176 init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
177 retval = ext2fs_calculate_summary_stats(rfs->new_fs);
180 print_resource_track(rfs, &rtrack, fs->io);
182 init_resource_track(&rtrack, "fix_resize_inode", fs->io);
183 retval = fix_resize_inode(rfs->new_fs);
186 print_resource_track(rfs, &rtrack, fs->io);
188 init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
189 retval = fix_sb_journal_backup(rfs->new_fs);
192 print_resource_track(rfs, &rtrack, fs->io);
194 rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
195 rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
197 print_resource_track(rfs, &overall_track, fs->io);
198 retval = ext2fs_close(rfs->new_fs);
204 ext2fs_free(rfs->old_fs);
206 ext2fs_free_mem(&rfs->itable_buf);
207 if (rfs->reserve_blocks)
208 ext2fs_free_block_bitmap(rfs->reserve_blocks);
209 if (rfs->move_blocks)
210 ext2fs_free_block_bitmap(rfs->move_blocks);
211 ext2fs_free_mem(&rfs);
217 ext2fs_free(rfs->new_fs);
219 ext2fs_free_mem(&rfs->itable_buf);
220 ext2fs_free_mem(&rfs);
225 * Clean up the bitmaps for unitialized bitmaps
227 static void fix_uninit_block_bitmaps(ext2_filsys fs)
233 if (!ext2fs_has_group_desc_csum(fs))
236 for (g=0; g < fs->group_desc_count; g++) {
237 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
240 blk = ext2fs_group_first_block2(fs, g);
241 lblk = ext2fs_group_last_block2(fs, g);
242 ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
245 ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
246 ext2fs_mark_block_bitmap2(fs->block_map,
247 ext2fs_block_bitmap_loc(fs, g));
248 ext2fs_mark_block_bitmap2(fs->block_map,
249 ext2fs_inode_bitmap_loc(fs, g));
250 for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
251 i < (unsigned int) fs->inode_blocks_per_group;
253 ext2fs_mark_block_bitmap2(fs->block_map, blk);
257 /* --------------------------------------------------------------------
259 * Resize processing, phase 1.
261 * In this phase we adjust the in-memory superblock information, and
262 * initialize any new parts of the inode table. The new parts of the
263 * inode table are created in virgin disk space, so we can abort here
264 * without any side effects.
265 * --------------------------------------------------------------------
269 * If the group descriptor's bitmap and inode table blocks are valid,
270 * release them in the new filesystem data structure, and mark them as
271 * reserved so the old inode table blocks don't get overwritten.
273 static void free_gdp_blocks(ext2_filsys fs,
274 ext2fs_block_bitmap reserve_blocks,
275 struct ext2_group_desc *gdp)
280 if (gdp->bg_block_bitmap &&
281 (gdp->bg_block_bitmap < ext2fs_blocks_count(fs->super))) {
282 ext2fs_block_alloc_stats(fs, gdp->bg_block_bitmap, -1);
283 ext2fs_mark_block_bitmap2(reserve_blocks,
284 gdp->bg_block_bitmap);
287 if (gdp->bg_inode_bitmap &&
288 (gdp->bg_inode_bitmap < ext2fs_blocks_count(fs->super))) {
289 ext2fs_block_alloc_stats(fs, gdp->bg_inode_bitmap, -1);
290 ext2fs_mark_block_bitmap2(reserve_blocks,
291 gdp->bg_inode_bitmap);
294 if (gdp->bg_inode_table == 0 ||
295 (gdp->bg_inode_table >= ext2fs_blocks_count(fs->super)))
298 for (blk = gdp->bg_inode_table, j = 0;
299 j < fs->inode_blocks_per_group; j++, blk++) {
300 if (blk >= ext2fs_blocks_count(fs->super))
302 ext2fs_block_alloc_stats(fs, blk, -1);
303 ext2fs_mark_block_bitmap2(reserve_blocks, blk);
308 * This routine is shared by the online and offline resize routines.
309 * All of the information which is adjusted in memory is done here.
311 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
312 ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
315 blk64_t overhead = 0;
317 blk64_t blk, group_block;
319 blk64_t old_numblocks, numblocks, adjblocks;
320 unsigned long i, j, old_desc_blocks;
321 unsigned int meta_bg, meta_bg_size;
322 int has_super, csum_flag;
323 unsigned long long new_inodes; /* u64 to check for overflow */
326 ext2fs_blocks_count_set(fs->super, new_size);
329 fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
330 fs->super->s_first_data_block,
331 EXT2_BLOCKS_PER_GROUP(fs->super));
332 if (fs->group_desc_count == 0)
333 return EXT2_ET_TOOSMALL;
334 fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
335 EXT2_DESC_PER_BLOCK(fs->super));
338 * Overhead is the number of bookkeeping blocks per group. It
339 * includes the superblock backup, the group descriptor
340 * backups, the inode bitmap, the block bitmap, and the inode
343 overhead = (int) (2 + fs->inode_blocks_per_group);
345 if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
346 overhead += 1 + fs->desc_blocks +
347 fs->super->s_reserved_gdt_blocks;
350 * See if the last group is big enough to support the
351 * necessary data structures. If not, we need to get rid of
354 rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
355 fs->super->s_blocks_per_group;
356 if ((fs->group_desc_count == 1) && rem && (rem < overhead))
357 return EXT2_ET_TOOSMALL;
358 if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
359 ext2fs_blocks_count_set(fs->super,
360 ext2fs_blocks_count(fs->super) - rem);
364 * Adjust the number of inodes
366 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
367 if (new_inodes > ~0U) {
368 fprintf(stderr, _("inodes (%llu) must be less than %u"),
370 return EXT2_ET_TOO_MANY_INODES;
372 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
373 fs->group_desc_count;
376 * Adjust the number of free blocks
378 blk = ext2fs_blocks_count(old_fs->super);
379 if (blk > ext2fs_blocks_count(fs->super))
380 ext2fs_free_blocks_count_set(fs->super,
381 ext2fs_free_blocks_count(fs->super) -
382 (blk - ext2fs_blocks_count(fs->super)));
384 ext2fs_free_blocks_count_set(fs->super,
385 ext2fs_free_blocks_count(fs->super) +
386 (ext2fs_blocks_count(fs->super) - blk));
389 * Adjust the number of reserved blocks
391 percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
392 ext2fs_blocks_count(old_fs->super);
393 ext2fs_r_blocks_count_set(fs->super,
394 (percent * ext2fs_blocks_count(fs->super) /
398 * Adjust the bitmaps for size
400 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
401 fs->super->s_inodes_count,
403 if (retval) goto errout;
405 real_end = (((blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super) *
406 fs->group_desc_count)) - 1 +
407 fs->super->s_first_data_block;
408 retval = ext2fs_resize_block_bitmap2(new_size - 1,
409 real_end, fs->block_map);
410 if (retval) goto errout;
413 * If we are growing the file system, also grow the size of
414 * the reserve_blocks bitmap
416 if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
417 retval = ext2fs_resize_block_bitmap2(new_size - 1,
418 real_end, reserve_blocks);
419 if (retval) goto errout;
423 * Reallocate the group descriptors as necessary.
425 if (old_fs->desc_blocks != fs->desc_blocks) {
426 retval = ext2fs_resize_mem(old_fs->desc_blocks *
428 fs->desc_blocks * fs->blocksize,
432 if (fs->desc_blocks > old_fs->desc_blocks)
433 memset((char *) fs->group_desc +
434 (old_fs->desc_blocks * fs->blocksize), 0,
435 (fs->desc_blocks - old_fs->desc_blocks) *
440 * If the resize_inode feature is set, and we are changing the
441 * number of descriptor blocks, then adjust
442 * s_reserved_gdt_blocks if possible to avoid needing to move
443 * the inode table either now or in the future.
445 if ((fs->super->s_feature_compat &
446 EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
447 (old_fs->desc_blocks != fs->desc_blocks)) {
450 new = ((int) fs->super->s_reserved_gdt_blocks) +
451 (old_fs->desc_blocks - fs->desc_blocks);
454 if (new > (int) fs->blocksize/4)
455 new = fs->blocksize/4;
456 fs->super->s_reserved_gdt_blocks = new;
460 * If we are shrinking the number of block groups, we're done
463 if (old_fs->group_desc_count > fs->group_desc_count) {
465 * Check the block groups that we are chopping off
466 * and free any blocks associated with their metadata
468 for (i = fs->group_desc_count;
469 i < old_fs->group_desc_count; i++) {
470 free_gdp_blocks(fs, reserve_blocks,
471 ext2fs_group_desc(old_fs,
472 old_fs->group_desc, i));
479 * Fix the count of the last (old) block group
481 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
482 old_fs->super->s_first_data_block) %
483 old_fs->super->s_blocks_per_group;
485 old_numblocks = old_fs->super->s_blocks_per_group;
486 if (old_fs->group_desc_count == fs->group_desc_count) {
487 numblocks = (ext2fs_blocks_count(fs->super) -
488 fs->super->s_first_data_block) %
489 fs->super->s_blocks_per_group;
491 numblocks = fs->super->s_blocks_per_group;
493 numblocks = fs->super->s_blocks_per_group;
494 i = old_fs->group_desc_count - 1;
495 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
496 ext2fs_group_desc_csum_set(fs, i);
499 * If the number of block groups is staying the same, we're
500 * done and can exit now. (If the number block groups is
501 * shrinking, we had exited earlier.)
503 if (old_fs->group_desc_count >= fs->group_desc_count) {
509 * Initialize the new block group descriptors
511 group_block = ext2fs_group_first_block2(fs,
512 old_fs->group_desc_count);
513 csum_flag = ext2fs_has_group_desc_csum(fs);
514 if (access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0)
515 lazy_itable_init = 1;
516 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
517 old_desc_blocks = fs->super->s_first_meta_bg;
519 old_desc_blocks = fs->desc_blocks +
520 fs->super->s_reserved_gdt_blocks;
523 * If we changed the number of block_group descriptor blocks,
524 * we need to make sure they are all marked as reserved in the
525 * file systems's block allocation map.
527 for (i = 0; i < old_fs->group_desc_count; i++)
528 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
530 for (i = old_fs->group_desc_count;
531 i < fs->group_desc_count; i++) {
532 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
533 sizeof(struct ext2_group_desc));
536 ext2fs_bg_flags_zap(fs, i);
538 ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
539 if (!lazy_itable_init)
540 ext2fs_bg_flags_set(fs, i,
541 EXT2_BG_INODE_ZEROED);
542 ext2fs_bg_itable_unused_set(fs, i,
543 fs->super->s_inodes_per_group);
546 numblocks = ext2fs_group_blocks_count(fs, i);
547 if ((i < fs->group_desc_count - 1) && csum_flag)
548 ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
550 has_super = ext2fs_bg_has_super(fs, i);
552 ext2fs_block_alloc_stats2(fs, group_block, +1);
555 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
556 meta_bg = i / meta_bg_size;
557 if (!(fs->super->s_feature_incompat &
558 EXT2_FEATURE_INCOMPAT_META_BG) ||
559 (meta_bg < fs->super->s_first_meta_bg)) {
561 for (j=0; j < old_desc_blocks; j++)
562 ext2fs_block_alloc_stats2(fs,
563 group_block + 1 + j, +1);
564 adjblocks += old_desc_blocks;
569 if (((i % meta_bg_size) == 0) ||
570 ((i % meta_bg_size) == 1) ||
571 ((i % meta_bg_size) == (meta_bg_size-1)))
572 ext2fs_block_alloc_stats2(fs,
573 group_block + has_super, +1);
576 adjblocks += 2 + fs->inode_blocks_per_group;
578 numblocks -= adjblocks;
579 ext2fs_free_blocks_count_set(fs->super,
580 ext2fs_free_blocks_count(fs->super) - adjblocks);
581 fs->super->s_free_inodes_count +=
582 fs->super->s_inodes_per_group;
583 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
584 ext2fs_bg_free_inodes_count_set(fs, i,
585 fs->super->s_inodes_per_group);
586 ext2fs_bg_used_dirs_count_set(fs, i, 0);
587 ext2fs_group_desc_csum_set(fs, i);
589 retval = ext2fs_allocate_group_table(fs, i, 0);
590 if (retval) goto errout;
592 group_block += fs->super->s_blocks_per_group;
597 * Mark all of the metadata blocks as reserved so they won't
598 * get allocated by the call to ext2fs_allocate_group_table()
599 * in blocks_to_move(), where we allocate new blocks to
600 * replace those allocation bitmap and inode table blocks
601 * which have to get relocated to make space for an increased
602 * number of the block group descriptors.
605 mark_table_blocks(fs, reserve_blocks);
612 * This routine adjusts the superblock and other data structures, both
613 * in disk as well as in memory...
615 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
622 unsigned long max_group;
625 ext2fs_mark_super_dirty(fs);
626 ext2fs_mark_bb_dirty(fs);
627 ext2fs_mark_ib_dirty(fs);
629 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
630 &rfs->reserve_blocks);
634 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
639 * Check to make sure there are enough inodes
641 if ((rfs->old_fs->super->s_inodes_count -
642 rfs->old_fs->super->s_free_inodes_count) >
643 rfs->new_fs->super->s_inodes_count) {
649 * If we are shrinking the number block groups, we're done and
652 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
658 * If the number of block groups is staying the same, we're
659 * done and can exit now. (If the number block groups is
660 * shrinking, we had exited earlier.)
662 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
668 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
669 * supports lazy inode initialization, we can skip
670 * initializing the inode table.
672 if (lazy_itable_init &&
673 EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
674 EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
680 * Initialize the inode table
682 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
687 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
688 group_block = ext2fs_group_first_block2(fs,
689 rfs->old_fs->group_desc_count);
690 adj = rfs->old_fs->group_desc_count;
691 max_group = fs->group_desc_count - adj;
693 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
698 for (i = rfs->old_fs->group_desc_count;
699 i < fs->group_desc_count; i++) {
701 * Write out the new inode table
703 retval = io_channel_write_blk64(fs->io,
704 ext2fs_inode_table_loc(fs, i),
705 fs->inode_blocks_per_group,
707 if (retval) goto errout;
709 io_channel_flush(fs->io);
711 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
712 i - adj + 1, max_group);
716 group_block += fs->super->s_blocks_per_group;
718 io_channel_flush(fs->io);
725 /* --------------------------------------------------------------------
727 * Resize processing, phase 2.
729 * In this phase we adjust determine which blocks need to be moved, in
730 * blocks_to_move(). We then copy the blocks to their ultimate new
731 * destinations using block_mover(). Since we are copying blocks to
732 * their new locations, again during this pass we can abort without
734 * --------------------------------------------------------------------
738 * This helper function creates a block bitmap with all of the
739 * filesystem meta-data blocks.
741 static errcode_t mark_table_blocks(ext2_filsys fs,
742 ext2fs_block_bitmap bmap)
747 for (i = 0; i < fs->group_desc_count; i++) {
748 ext2fs_reserve_super_and_bgd(fs, i, bmap);
751 * Mark the blocks used for the inode table
753 blk = ext2fs_inode_table_loc(fs, i);
755 ext2fs_mark_block_bitmap_range2(bmap, blk,
756 fs->inode_blocks_per_group);
759 * Mark block used for the block bitmap
761 blk = ext2fs_block_bitmap_loc(fs, i);
763 ext2fs_mark_block_bitmap2(bmap, blk);
766 * Mark block used for the inode bitmap
768 blk = ext2fs_inode_bitmap_loc(fs, i);
770 ext2fs_mark_block_bitmap2(bmap, blk);
776 * This function checks to see if a particular block (either a
777 * superblock or a block group descriptor) overlaps with an inode or
778 * block bitmap block, or with the inode table.
780 static void mark_fs_metablock(ext2_resize_t rfs,
781 ext2fs_block_bitmap meta_bmap,
782 int group, blk64_t blk)
784 ext2_filsys fs = rfs->new_fs;
786 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
787 ext2fs_block_alloc_stats2(fs, blk, +1);
790 * Check to see if we overlap with the inode or block bitmap,
791 * or the inode tables. If not, and the block is in use, then
792 * mark it as a block to be moved.
794 if (IS_BLOCK_BM(fs, group, blk)) {
795 ext2fs_block_bitmap_loc_set(fs, group, 0);
796 rfs->needed_blocks++;
799 if (IS_INODE_BM(fs, group, blk)) {
800 ext2fs_inode_bitmap_loc_set(fs, group, 0);
801 rfs->needed_blocks++;
804 if (IS_INODE_TB(fs, group, blk)) {
805 ext2fs_inode_table_loc_set(fs, group, 0);
806 rfs->needed_blocks++;
809 if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
812 for (i=0; i < rfs->old_fs->group_desc_count; i++) {
813 if (IS_BLOCK_BM(fs, i, blk)) {
814 ext2fs_block_bitmap_loc_set(fs, i, 0);
815 rfs->needed_blocks++;
818 if (IS_INODE_BM(fs, i, blk)) {
819 ext2fs_inode_bitmap_loc_set(fs, i, 0);
820 rfs->needed_blocks++;
823 if (IS_INODE_TB(fs, i, blk)) {
824 ext2fs_inode_table_loc_set(fs, i, 0);
825 rfs->needed_blocks++;
831 if (ext2fs_has_group_desc_csum(fs) &&
832 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
834 * If the block bitmap is uninitialized, which means
835 * nothing other than standard metadata in use.
838 } else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
839 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
840 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
841 rfs->needed_blocks++;
847 * This routine marks and unmarks reserved blocks in the new block
848 * bitmap. It also determines which blocks need to be moved and
849 * places this information into the move_blocks bitmap.
851 static errcode_t blocks_to_move(ext2_resize_t rfs)
854 dgrp_t i, max_groups, g;
855 blk64_t blk, group_blk;
856 blk64_t old_blocks, new_blocks;
858 unsigned int meta_bg, meta_bg_size;
860 ext2_filsys fs, old_fs;
861 ext2fs_block_bitmap meta_bmap;
865 old_fs = rfs->old_fs;
866 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
869 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
874 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
879 retval = mark_table_blocks(old_fs, meta_bmap);
886 * If we're shrinking the filesystem, we need to move any group's
887 * bitmaps which are beyond the end of the new filesystem.
889 new_size = ext2fs_blocks_count(fs->super);
890 if (new_size < ext2fs_blocks_count(old_fs->super)) {
891 for (g = 0; g < fs->group_desc_count; g++) {
893 * ext2fs_allocate_group_table re-allocates bitmaps
894 * which are set to block 0.
896 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
897 ext2fs_block_bitmap_loc_set(fs, g, 0);
898 retval = ext2fs_allocate_group_table(fs, g, 0);
902 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
903 ext2fs_inode_bitmap_loc_set(fs, g, 0);
904 retval = ext2fs_allocate_group_table(fs, g, 0);
912 * If we're shrinking the filesystem, we need to move all of
913 * the blocks that don't fit any more
915 for (blk = ext2fs_blocks_count(fs->super);
916 blk < ext2fs_blocks_count(old_fs->super); blk++) {
917 g = ext2fs_group_of_blk2(fs, blk);
918 if (ext2fs_has_group_desc_csum(fs) &&
919 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
921 * The block bitmap is uninitialized, so skip
922 * to the next block group.
924 blk = ext2fs_group_first_block2(fs, g+1) - 1;
927 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
928 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
929 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
930 rfs->needed_blocks++;
932 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
935 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
936 old_blocks = old_fs->super->s_first_meta_bg;
937 new_blocks = fs->super->s_first_meta_bg;
939 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
940 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
943 if (old_blocks == new_blocks) {
948 max_groups = fs->group_desc_count;
949 if (max_groups > old_fs->group_desc_count)
950 max_groups = old_fs->group_desc_count;
951 group_blk = old_fs->super->s_first_data_block;
953 * If we're reducing the number of descriptor blocks, this
954 * makes life easy. :-) We just have to mark some extra
957 if (old_blocks > new_blocks) {
958 for (i = 0; i < max_groups; i++) {
959 if (!ext2fs_bg_has_super(fs, i)) {
960 group_blk += fs->super->s_blocks_per_group;
963 for (blk = group_blk+1+new_blocks;
964 blk < group_blk+1+old_blocks; blk++) {
965 ext2fs_block_alloc_stats2(fs, blk, -1);
966 rfs->needed_blocks--;
968 group_blk += fs->super->s_blocks_per_group;
974 * If we're increasing the number of descriptor blocks, life
975 * gets interesting....
977 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
978 flex_bg = fs->super->s_feature_incompat &
979 EXT4_FEATURE_INCOMPAT_FLEX_BG;
980 /* first reserve all of the existing fs meta blocks */
981 for (i = 0; i < max_groups; i++) {
982 has_super = ext2fs_bg_has_super(fs, i);
984 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
986 meta_bg = i / meta_bg_size;
987 if (!(fs->super->s_feature_incompat &
988 EXT2_FEATURE_INCOMPAT_META_BG) ||
989 (meta_bg < fs->super->s_first_meta_bg)) {
991 for (blk = group_blk+1;
992 blk < group_blk + 1 + new_blocks; blk++)
993 mark_fs_metablock(rfs, meta_bmap,
999 if (((i % meta_bg_size) == 0) ||
1000 ((i % meta_bg_size) == 1) ||
1001 ((i % meta_bg_size) == (meta_bg_size-1)))
1002 mark_fs_metablock(rfs, meta_bmap, i,
1003 group_blk + has_super);
1007 * Reserve the existing meta blocks that we know
1008 * aren't to be moved.
1010 * For flex_bg file systems, in order to avoid
1011 * overwriting fs metadata (especially inode table
1012 * blocks) belonging to a different block group when
1013 * we are relocating the inode tables, we need to
1014 * reserve all existing fs metadata blocks.
1016 if (ext2fs_block_bitmap_loc(fs, i))
1017 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1018 ext2fs_block_bitmap_loc(fs, i));
1019 else if (flex_bg && i < old_fs->group_desc_count)
1020 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1021 ext2fs_block_bitmap_loc(old_fs, i));
1023 if (ext2fs_inode_bitmap_loc(fs, i))
1024 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1025 ext2fs_inode_bitmap_loc(fs, i));
1026 else if (flex_bg && i < old_fs->group_desc_count)
1027 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1028 ext2fs_inode_bitmap_loc(old_fs, i));
1030 if (ext2fs_inode_table_loc(fs, i))
1031 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1032 ext2fs_inode_table_loc(fs, i),
1033 fs->inode_blocks_per_group);
1034 else if (flex_bg && i < old_fs->group_desc_count)
1035 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1036 ext2fs_inode_table_loc(old_fs, i),
1037 old_fs->inode_blocks_per_group);
1039 group_blk += rfs->new_fs->super->s_blocks_per_group;
1042 /* Allocate the missing data structures */
1043 for (i = 0; i < max_groups; i++) {
1044 if (ext2fs_inode_table_loc(fs, i) &&
1045 ext2fs_inode_bitmap_loc(fs, i) &&
1046 ext2fs_block_bitmap_loc(fs, i))
1049 retval = ext2fs_allocate_group_table(fs, i,
1050 rfs->reserve_blocks);
1055 * For those structures that have changed, we need to
1058 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1059 (blk = ext2fs_block_bitmap_loc(fs, i))) {
1060 ext2fs_block_alloc_stats2(fs, blk, +1);
1061 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1062 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1063 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1066 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1067 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1068 ext2fs_block_alloc_stats2(fs, blk, +1);
1069 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1070 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1071 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1076 * The inode table, if we need to relocate it, is
1077 * handled specially. We have to reserve the blocks
1078 * for both the old and the new inode table, since we
1079 * can't have the inode table be destroyed during the
1080 * block relocation phase.
1082 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1083 continue; /* inode table not moved */
1085 rfs->needed_blocks += fs->inode_blocks_per_group;
1088 * Mark the new inode table as in use in the new block
1089 * allocation bitmap, and move any blocks that might
1092 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1093 j < fs->inode_blocks_per_group ; j++, blk++) {
1094 ext2fs_block_alloc_stats2(fs, blk, +1);
1095 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1096 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1097 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1102 * Make sure the old inode table is reserved in the
1103 * block reservation bitmap.
1105 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1106 j < fs->inode_blocks_per_group ; j++, blk++)
1107 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1113 ext2fs_free_block_bitmap(meta_bmap);
1119 * This helper function tries to allocate a new block. We try to
1120 * avoid hitting the original group descriptor blocks at least at
1121 * first, since we want to make it possible to recover from a badly
1122 * aborted resize operation as much as possible.
1124 * In the future, I may further modify this routine to balance out
1125 * where we get the new blocks across the various block groups.
1126 * Ideally we would allocate blocks that corresponded with the block
1127 * group of the containing inode, and keep contiguous blocks
1128 * together. However, this very difficult to do efficiently, since we
1129 * don't have the necessary information up front.
1133 #define DESPERATION 2
1135 static void init_block_alloc(ext2_resize_t rfs)
1137 rfs->alloc_state = AVOID_OLD;
1138 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1140 /* HACK for testing */
1141 if (ext2fs_blocks_count(rfs->new_fs->super) >
1142 ext2fs_blocks_count(rfs->old_fs->super))
1143 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1147 static blk64_t get_new_block(ext2_resize_t rfs)
1149 ext2_filsys fs = rfs->new_fs;
1152 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1153 if (rfs->alloc_state == DESPERATION)
1156 #ifdef RESIZE2FS_DEBUG
1157 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1158 printf("Going into desperation mode "
1159 "for block allocations\n");
1161 rfs->alloc_state = DESPERATION;
1162 rfs->new_blk = fs->super->s_first_data_block;
1165 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1166 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1168 ((rfs->alloc_state == AVOID_OLD) &&
1169 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1170 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1175 return rfs->new_blk;
1179 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs, blk64_t goal,
1182 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1185 blk = get_new_block(rfs);
1189 #ifdef RESIZE2FS_DEBUG
1190 if (rfs->flags & 0xF)
1191 printf("get_alloc_block allocating %llu\n", blk);
1194 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1195 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1196 *ret = (blk64_t) blk;
1200 static errcode_t block_mover(ext2_resize_t rfs)
1202 blk64_t blk, old_blk, new_blk;
1203 ext2_filsys fs = rfs->new_fs;
1204 ext2_filsys old_fs = rfs->old_fs;
1209 ext2_badblocks_list badblock_list = 0;
1210 int bb_modified = 0;
1212 fs->get_alloc_block = resize2fs_get_alloc_block;
1213 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1215 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1219 new_blk = fs->super->s_first_data_block;
1220 if (!rfs->itable_buf) {
1221 retval = ext2fs_get_array(fs->blocksize,
1222 fs->inode_blocks_per_group,
1227 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1232 * The first step is to figure out where all of the blocks
1235 to_move = moved = 0;
1236 init_block_alloc(rfs);
1237 for (blk = B2C(old_fs->super->s_first_data_block);
1238 blk < ext2fs_blocks_count(old_fs->super);
1239 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1240 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1242 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1244 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1245 ext2fs_badblocks_list_del(badblock_list, blk);
1250 new_blk = get_new_block(rfs);
1255 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1256 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1262 ext2fs_free_extent_table(rfs->bmap);
1270 * Step two is to actually move the blocks
1272 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1273 if (retval) goto errout;
1275 if (rfs->progress) {
1276 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1282 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1283 if (retval) goto errout;
1286 old_blk = C2B(old_blk);
1287 new_blk = C2B(new_blk);
1289 #ifdef RESIZE2FS_DEBUG
1290 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1291 printf("Moving %llu blocks %llu->%llu\n",
1292 size, old_blk, new_blk);
1296 if (c > fs->inode_blocks_per_group)
1297 c = fs->inode_blocks_per_group;
1298 retval = io_channel_read_blk64(fs->io, old_blk, c,
1300 if (retval) goto errout;
1301 retval = io_channel_write_blk64(fs->io, new_blk, c,
1303 if (retval) goto errout;
1308 if (rfs->progress) {
1309 io_channel_flush(fs->io);
1310 retval = (rfs->progress)(rfs,
1311 E2_RSZ_BLOCK_RELOC_PASS,
1317 io_channel_flush(fs->io);
1321 if (badblock_list) {
1322 if (!retval && bb_modified)
1323 retval = ext2fs_update_bb_inode(old_fs,
1325 ext2fs_badblocks_list_free(badblock_list);
1331 /* --------------------------------------------------------------------
1333 * Resize processing, phase 3
1335 * --------------------------------------------------------------------
1340 * The extent translation table is stored in clusters so we need to
1341 * take special care when mapping a source block number to its
1342 * destination block number.
1344 __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1346 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1349 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1353 struct process_block_struct {
1356 struct ext2_inode * inode;
1362 static int process_block(ext2_filsys fs, blk64_t *block_nr,
1363 e2_blkcnt_t blockcnt,
1364 blk64_t ref_block EXT2FS_ATTR((unused)),
1365 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1367 struct process_block_struct *pb;
1369 blk64_t block, new_block;
1372 pb = (struct process_block_struct *) priv_data;
1374 if (pb->rfs->bmap) {
1375 new_block = extent_translate(fs, pb->rfs->bmap, block);
1377 *block_nr = new_block;
1378 ret |= BLOCK_CHANGED;
1380 #ifdef RESIZE2FS_DEBUG
1381 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1382 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1383 pb->ino, blockcnt, block, new_block);
1389 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1390 block, (int) blockcnt);
1402 static errcode_t progress_callback(ext2_filsys fs,
1403 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1404 dgrp_t group, void * priv_data)
1406 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1410 * This check is to protect against old ext2 libraries. It
1411 * shouldn't be needed against new libraries.
1416 if (rfs->progress) {
1417 io_channel_flush(fs->io);
1418 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1419 group+1, fs->group_desc_count);
1427 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1429 struct process_block_struct pb;
1430 ext2_ino_t ino, new_inode;
1431 struct ext2_inode *inode = NULL;
1432 ext2_inode_scan scan = NULL;
1434 char *block_buf = 0;
1435 ext2_ino_t start_to_move;
1440 if ((rfs->old_fs->group_desc_count <=
1441 rfs->new_fs->group_desc_count) &&
1446 * Save the original size of the old filesystem, and
1447 * temporarily set the size to be the new size if the new size
1448 * is larger. We need to do this to avoid catching an error
1449 * by the block iterator routines
1451 orig_size = ext2fs_blocks_count(rfs->old_fs->super);
1452 if (orig_size < ext2fs_blocks_count(rfs->new_fs->super))
1453 ext2fs_blocks_count_set(rfs->old_fs->super,
1454 ext2fs_blocks_count(rfs->new_fs->super));
1456 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1457 if (retval) goto errout;
1459 retval = ext2fs_init_dblist(rfs->old_fs, 0);
1460 if (retval) goto errout;
1461 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
1462 if (retval) goto errout;
1464 start_to_move = (rfs->new_fs->group_desc_count *
1465 rfs->new_fs->super->s_inodes_per_group);
1467 if (rfs->progress) {
1468 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1469 0, rfs->old_fs->group_desc_count);
1473 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1477 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1478 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
1479 inode = malloc(inode_size);
1485 * First, copy all of the inodes that need to be moved
1486 * elsewhere in the inode table
1489 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
1490 if (retval) goto errout;
1494 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
1495 continue; /* inode not in use */
1497 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
1500 if (ext2fs_file_acl_block(rfs->old_fs, inode) && rfs->bmap) {
1501 new_block = extent_translate(rfs->old_fs, rfs->bmap,
1502 ext2fs_file_acl_block(rfs->old_fs, inode));
1504 ext2fs_file_acl_block_set(rfs->old_fs, inode,
1506 retval = ext2fs_write_inode_full(rfs->old_fs,
1507 ino, inode, inode_size);
1508 if (retval) goto errout;
1512 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
1513 (rfs->bmap || pb.is_dir)) {
1515 retval = ext2fs_block_iterate3(rfs->old_fs,
1517 process_block, &pb);
1526 if (ino <= start_to_move)
1527 continue; /* Don't need to move it. */
1532 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
1536 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
1539 /* Get the new version of the inode */
1540 retval = ext2fs_read_inode_full(rfs->old_fs, ino,
1542 if (retval) goto errout;
1544 inode->i_ctime = time(0);
1545 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
1547 if (retval) goto errout;
1549 #ifdef RESIZE2FS_DEBUG
1550 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1551 printf("Inode moved %u->%u\n", ino, new_inode);
1554 retval = ext2fs_create_extent_table(&rfs->imap, 0);
1558 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1560 io_channel_flush(rfs->old_fs->io);
1563 ext2fs_blocks_count_set(rfs->old_fs->super, orig_size);
1565 ext2fs_free_extent_table(rfs->bmap);
1569 ext2fs_close_inode_scan(scan);
1571 ext2fs_free_mem(&block_buf);
1576 /* --------------------------------------------------------------------
1578 * Resize processing, phase 4.
1580 * --------------------------------------------------------------------
1586 unsigned int max_dirs;
1590 static int check_and_change_inodes(ext2_ino_t dir,
1591 int entry EXT2FS_ATTR((unused)),
1592 struct ext2_dir_entry *dirent, int offset,
1593 int blocksize EXT2FS_ATTR((unused)),
1594 char *buf EXT2FS_ATTR((unused)),
1597 struct istruct *is = (struct istruct *) priv_data;
1598 struct ext2_inode inode;
1599 ext2_ino_t new_inode;
1602 if (is->rfs->progress && offset == 0) {
1603 io_channel_flush(is->rfs->old_fs->io);
1604 is->err = (is->rfs->progress)(is->rfs,
1605 E2_RSZ_INODE_REF_UPD_PASS,
1606 ++is->num, is->max_dirs);
1608 return DIRENT_ABORT;
1614 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1618 #ifdef RESIZE2FS_DEBUG
1619 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1620 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1621 dir, ext2fs_dirent_name_len(dirent), dirent->name,
1622 dirent->inode, new_inode);
1625 dirent->inode = new_inode;
1627 /* Update the directory mtime and ctime */
1628 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1630 inode.i_mtime = inode.i_ctime = time(0);
1631 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1633 return DIRENT_ABORT;
1636 return DIRENT_CHANGED;
1639 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1648 * Now, we iterate over all of the directories to update the
1652 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
1656 if (rfs->progress) {
1657 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1663 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1664 DIRENT_FLAG_INCLUDE_EMPTY, 0,
1665 check_and_change_inodes, &is);
1673 if (rfs->progress && (is.num < is.max_dirs))
1674 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1675 is.max_dirs, is.max_dirs);
1678 ext2fs_free_extent_table(rfs->imap);
1684 /* --------------------------------------------------------------------
1686 * Resize processing, phase 5.
1688 * In this phase we actually move the inode table around, and then
1689 * update the summary statistics. This is scary, since aborting here
1690 * will potentially scramble the filesystem. (We are moving the
1691 * inode tables around in place, and so the potential for lost data,
1692 * or at the very least scrambling the mapping between filenames and
1693 * inode numbers is very high in case of a power failure here.)
1694 * --------------------------------------------------------------------
1699 * A very scary routine --- this one moves the inode table around!!!
1701 * After this you have to use the rfs->new_fs file handle to read and
1704 static errcode_t move_itables(ext2_resize_t rfs)
1708 dgrp_t i, max_groups;
1709 ext2_filsys fs = rfs->new_fs;
1711 blk64_t old_blk, new_blk, blk;
1713 int j, to_move, moved;
1715 max_groups = fs->group_desc_count;
1716 if (max_groups > rfs->old_fs->group_desc_count)
1717 max_groups = rfs->old_fs->group_desc_count;
1719 size = fs->blocksize * fs->inode_blocks_per_group;
1720 if (!rfs->itable_buf) {
1721 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1727 * Figure out how many inode tables we need to move
1729 to_move = moved = 0;
1730 for (i=0; i < max_groups; i++)
1731 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
1732 ext2fs_inode_table_loc(fs, i))
1738 if (rfs->progress) {
1739 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1745 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1747 for (i=0; i < max_groups; i++) {
1748 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
1749 new_blk = ext2fs_inode_table_loc(fs, i);
1750 diff = new_blk - old_blk;
1752 #ifdef RESIZE2FS_DEBUG
1753 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1754 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
1755 i, old_blk, new_blk, diff);
1761 retval = io_channel_read_blk64(fs->io, old_blk,
1762 fs->inode_blocks_per_group,
1767 * The end of the inode table segment often contains
1768 * all zeros, and we're often only moving the inode
1769 * table down a block or two. If so, we can optimize
1770 * things by not rewriting blocks that we know to be zero
1773 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
1776 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1777 #ifdef RESIZE2FS_DEBUG
1778 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1779 printf("%d blocks of zeros...\n", n);
1781 num = fs->inode_blocks_per_group;
1785 retval = io_channel_write_blk64(fs->io, new_blk,
1786 num, rfs->itable_buf);
1788 io_channel_write_blk64(fs->io, old_blk,
1789 num, rfs->itable_buf);
1793 retval = io_channel_write_blk64(fs->io,
1794 old_blk + fs->inode_blocks_per_group,
1795 diff, (rfs->itable_buf +
1796 (fs->inode_blocks_per_group - diff) *
1802 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1803 j < fs->inode_blocks_per_group ; j++, blk++)
1804 ext2fs_block_alloc_stats2(fs, blk, -1);
1806 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
1807 ext2fs_group_desc_csum_set(rfs->old_fs, i);
1808 ext2fs_mark_super_dirty(rfs->old_fs);
1809 ext2fs_flush(rfs->old_fs);
1811 if (rfs->progress) {
1812 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1818 mark_table_blocks(fs, fs->block_map);
1820 #ifdef RESIZE2FS_DEBUG
1821 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1822 printf("Inode table move finished.\n");
1831 * Fix the resize inode
1833 static errcode_t fix_resize_inode(ext2_filsys fs)
1835 struct ext2_inode inode;
1837 char *block_buf = NULL;
1839 if (!(fs->super->s_feature_compat &
1840 EXT2_FEATURE_COMPAT_RESIZE_INODE))
1843 retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1844 if (retval) goto errout;
1846 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1847 if (retval) goto errout;
1849 ext2fs_iblk_set(fs, &inode, 1);
1851 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1852 if (retval) goto errout;
1854 if (!inode.i_block[EXT2_DIND_BLOCK]) {
1856 * Avoid zeroing out block #0; that's rude. This
1857 * should never happen anyway since the filesystem
1858 * should be fsck'ed and we assume it is consistent.
1861 _("Should never happen: resize inode corrupt!\n"));
1865 memset(block_buf, 0, fs->blocksize);
1867 retval = io_channel_write_blk64(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1869 if (retval) goto errout;
1871 retval = ext2fs_create_resize_inode(fs);
1877 ext2fs_free_mem(&block_buf);
1882 * Finally, recalculate the summary information
1884 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1888 unsigned int group = 0;
1889 unsigned int count = 0;
1890 blk64_t total_blocks_free = 0;
1891 int total_inodes_free = 0;
1894 blk64_t super_blk, old_desc_blk, new_desc_blk;
1895 int old_desc_blocks;
1898 * First calculate the block statistics
1900 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
1901 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
1903 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
1904 old_desc_blocks = fs->super->s_first_meta_bg;
1906 old_desc_blocks = fs->desc_blocks +
1907 fs->super->s_reserved_gdt_blocks;
1908 for (blk = B2C(fs->super->s_first_data_block);
1909 blk < ext2fs_blocks_count(fs->super);
1910 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1912 !(EQ_CLSTR(blk, super_blk) ||
1913 ((old_desc_blk && old_desc_blocks &&
1914 GE_CLSTR(blk, old_desc_blk) &&
1915 LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
1916 ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
1917 EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
1918 EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
1919 ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
1920 LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
1921 + fs->inode_blocks_per_group))))) ||
1922 (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
1924 total_blocks_free++;
1927 if ((count == fs->super->s_clusters_per_group) ||
1928 EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
1929 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
1930 ext2fs_group_desc_csum_set(fs, group);
1932 if (group >= fs->group_desc_count)
1936 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
1937 ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
1940 if (fs->super->s_feature_incompat &
1941 EXT2_FEATURE_INCOMPAT_META_BG)
1942 old_desc_blocks = fs->super->s_first_meta_bg;
1944 old_desc_blocks = fs->desc_blocks +
1945 fs->super->s_reserved_gdt_blocks;
1948 total_blocks_free = C2B(total_blocks_free);
1949 ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
1952 * Next, calculate the inode statistics
1958 /* Protect loop from wrap-around if s_inodes_count maxed */
1959 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
1960 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
1962 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
1964 total_inodes_free++;
1967 if ((count == fs->super->s_inodes_per_group) ||
1968 (ino == fs->super->s_inodes_count)) {
1969 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
1970 ext2fs_group_desc_csum_set(fs, group);
1972 if (group >= fs->group_desc_count)
1976 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
1979 fs->super->s_free_inodes_count = total_inodes_free;
1980 ext2fs_mark_super_dirty(fs);
1985 * Journal may have been relocated; update the backup journal blocks
1986 * in the superblock.
1988 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
1991 struct ext2_inode inode;
1993 if (!(fs->super->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1996 /* External journal? Nothing to do. */
1997 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2000 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2003 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2004 fs->super->s_jnl_blocks[15] = inode.i_size_high;
2005 fs->super->s_jnl_blocks[16] = inode.i_size;
2006 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2007 ext2fs_mark_super_dirty(fs);
2011 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2012 int old_desc_blocks)
2014 blk64_t super_blk, old_desc_blk, new_desc_blk;
2017 /* inode table blocks plus allocation bitmaps */
2018 overhead = fs->inode_blocks_per_group + 2;
2020 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2021 &old_desc_blk, &new_desc_blk, 0);
2022 if ((grp == 0) || super_blk)
2025 overhead += old_desc_blocks;
2026 else if (new_desc_blk)
2033 * calcluate the minimum number of blocks the given fs can be resized to
2035 blk64_t calculate_minimum_resize_size(ext2_filsys fs)
2037 ext2_ino_t inode_count;
2038 blk64_t blks_needed, groups, data_blocks;
2039 blk64_t grp, data_needed, last_start;
2040 blk64_t overhead = 0;
2041 int old_desc_blocks;
2042 int extra_groups = 0;
2043 int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2046 * first figure out how many group descriptors we need to
2047 * handle the number of inodes we have
2049 inode_count = fs->super->s_inodes_count -
2050 fs->super->s_free_inodes_count;
2051 blks_needed = ext2fs_div_ceil(inode_count,
2052 fs->super->s_inodes_per_group) *
2053 EXT2_BLOCKS_PER_GROUP(fs->super);
2054 groups = ext2fs_div64_ceil(blks_needed,
2055 EXT2_BLOCKS_PER_GROUP(fs->super));
2058 * number of old-style block group descriptor blocks
2060 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
2061 old_desc_blocks = fs->super->s_first_meta_bg;
2063 old_desc_blocks = fs->desc_blocks +
2064 fs->super->s_reserved_gdt_blocks;
2066 /* calculate how many blocks are needed for data */
2067 data_needed = ext2fs_blocks_count(fs->super) -
2068 ext2fs_free_blocks_count(fs->super);
2070 for (grp = 0; grp < fs->group_desc_count; grp++)
2071 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
2074 * For ext4 we need to allow for up to a flex_bg worth of
2075 * inode tables of slack space so the resize operation can be
2076 * guaranteed to finish.
2078 if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
2079 extra_groups = flexbg_size - (groups & (flexbg_size - 1));
2080 data_needed += fs->inode_blocks_per_group * extra_groups;
2081 extra_groups = groups % flexbg_size;
2085 * figure out how many data blocks we have given the number of groups
2086 * we need for our inodes
2088 data_blocks = groups * EXT2_BLOCKS_PER_GROUP(fs->super);
2090 for (grp = 0; grp < groups; grp++) {
2091 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
2094 * we want to keep track of how much data we can store in
2095 * the groups leading up to the last group so we can determine
2096 * how big the last group needs to be
2098 if (grp != (groups - 1))
2099 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
2102 data_blocks -= overhead;
2106 * if we need more group descriptors in order to accomodate our data
2107 * then we need to add them here
2109 while (data_needed > data_blocks) {
2110 blk64_t remainder = data_needed - data_blocks;
2113 /* figure out how many more groups we need for the data */
2114 extra_grps = ext2fs_div64_ceil(remainder,
2115 EXT2_BLOCKS_PER_GROUP(fs->super));
2117 data_blocks += extra_grps * EXT2_BLOCKS_PER_GROUP(fs->super);
2119 /* ok we have to account for the last group */
2120 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2121 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
2123 for (grp = groups; grp < groups+extra_grps; grp++) {
2124 overhead = calc_group_overhead(fs, grp,
2128 * again, we need to see how much data we cram into
2129 * all of the groups leading up to the last group
2131 if (grp != (groups + extra_grps - 1))
2132 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
2135 data_blocks -= overhead;
2138 groups += extra_grps;
2139 extra_groups += extra_grps;
2140 if (fs->super->s_feature_incompat
2141 & EXT4_FEATURE_INCOMPAT_FLEX_BG
2142 && extra_groups > flexbg_size) {
2144 * For ext4 we need to allow for up to a flex_bg worth
2145 * of inode tables of slack space so the resize
2146 * operation can be guaranteed to finish.
2148 extra_groups = flexbg_size -
2149 (groups & (flexbg_size - 1));
2150 data_needed += (fs->inode_blocks_per_group *
2152 extra_groups = groups % flexbg_size;
2156 /* now for the fun voodoo */
2157 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2160 * if this is the case then the last group is going to have data in it
2161 * so we need to adjust the size of the last group accordingly
2163 if (last_start < data_needed) {
2164 blk64_t remainder = data_needed - last_start;
2167 * 50 is a magic number that mkfs/resize uses to see if its
2168 * even worth making/resizing the fs. basically you need to
2169 * have at least 50 blocks in addition to the blocks needed
2170 * for the metadata in the last group
2173 overhead += remainder;
2179 overhead += fs->super->s_first_data_block;
2182 * since our last group doesn't have to be BLOCKS_PER_GROUP large, we
2183 * only do groups-1, and then add the number of blocks needed to
2184 * handle the group descriptor metadata+data that we need
2186 blks_needed = (groups-1) * EXT2_BLOCKS_PER_GROUP(fs->super);
2187 blks_needed += overhead;
2190 * If at this point we've already added up more "needed" than
2191 * the current size, just return current size as minimum.
2193 if (blks_needed >= ext2fs_blocks_count(fs->super))
2194 return ext2fs_blocks_count(fs->super);
2196 * We need to reserve a few extra blocks if extents are
2197 * enabled, in case we need to grow the extent tree. The more
2198 * we shrink the file system, the more space we need.
2200 if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
2201 blks_needed += (ext2fs_blocks_count(fs->super) -