2 * resize2fs.c --- ext2 main routine
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
7 * Copyright (C) 1999, 2000 by Theosore Ts'o
10 * This file may be redistributed under the terms of the GNU Public
16 * Resizing a filesystem consists of the following phases:
18 * 1. Adjust superblock and write out new parts of the inode
20 * 2. Determine blocks which need to be relocated, and copy the
21 * contents of blocks from their old locations to the new ones.
22 * 3. Scan the inode table, doing the following:
23 * a. If blocks have been moved, update the block
24 * pointers in the inodes and indirect blocks to
25 * point at the new block locations.
26 * b. If parts of the inode table need to be evacuated,
27 * copy inodes from their old locations to their
29 * c. If (b) needs to be done, note which blocks contain
30 * directory information, since we will need to
31 * update the directory information.
32 * 4. Update the directory blocks with the new inode locations.
33 * 5. Move the inode tables, if necessary.
37 #include "resize2fs.h"
40 #ifdef __linux__ /* Kludge for debugging */
41 #define RESIZE2FS_DEBUG
44 static void fix_uninit_block_bitmaps(ext2_filsys fs
);
45 static errcode_t
adjust_superblock(ext2_resize_t rfs
, blk64_t new_size
);
46 static errcode_t
blocks_to_move(ext2_resize_t rfs
);
47 static errcode_t
block_mover(ext2_resize_t rfs
);
48 static errcode_t
inode_scan_and_fix(ext2_resize_t rfs
);
49 static errcode_t
inode_ref_fix(ext2_resize_t rfs
);
50 static errcode_t
move_itables(ext2_resize_t rfs
);
51 static errcode_t
fix_resize_inode(ext2_filsys fs
);
52 static errcode_t
ext2fs_calculate_summary_stats(ext2_filsys fs
);
53 static errcode_t
fix_sb_journal_backup(ext2_filsys fs
);
54 static errcode_t
mark_table_blocks(ext2_filsys fs
,
55 ext2fs_block_bitmap bmap
);
56 static errcode_t
clear_sparse_super2_last_group(ext2_resize_t rfs
);
57 static errcode_t
reserve_sparse_super2_last_group(ext2_resize_t rfs
,
58 ext2fs_block_bitmap meta_bmap
);
59 static errcode_t
resize_group_descriptors(ext2_resize_t rfs
, blk64_t new_size
);
60 static errcode_t
move_bg_metadata(ext2_resize_t rfs
);
61 static errcode_t
zero_high_bits_in_inodes(ext2_resize_t rfs
);
64 * Some helper functions to check if a block is in a metadata area
66 static inline int is_block_bm(ext2_filsys fs
, unsigned int grp
, blk64_t blk
)
68 return blk
== ext2fs_block_bitmap_loc(fs
, grp
);
71 static inline int is_inode_bm(ext2_filsys fs
, unsigned int grp
, blk64_t blk
)
73 return blk
== ext2fs_inode_bitmap_loc(fs
, grp
);
76 static int is_inode_tb(ext2_filsys fs
, unsigned int grp
, blk64_t blk
)
78 return blk
>= ext2fs_inode_table_loc(fs
, grp
) &&
79 blk
< (ext2fs_inode_table_loc(fs
, grp
) +
80 fs
->inode_blocks_per_group
);
83 /* Some bigalloc helper macros which are more succint... */
84 #define B2C(x) EXT2FS_B2C(fs, (x))
85 #define C2B(x) EXT2FS_C2B(fs, (x))
86 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
87 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
88 #define LT_CLSTR(x, y) (B2C(x) < B2C(y))
89 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
90 #define GT_CLSTR(x, y) (B2C(x) > B2C(y))
92 static int lazy_itable_init
;
95 * This is the top-level routine which does the dirty deed....
97 errcode_t
resize_fs(ext2_filsys fs
, blk64_t
*new_size
, int flags
,
98 errcode_t (*progress
)(ext2_resize_t rfs
, int pass
,
100 unsigned long max_val
))
104 struct resource_track rtrack
, overall_track
;
107 * Create the data structure
109 retval
= ext2fs_get_mem(sizeof(struct ext2_resize_struct
), &rfs
);
113 memset(rfs
, 0, sizeof(struct ext2_resize_struct
));
118 rfs
->progress
= progress
;
120 init_resource_track(&overall_track
, "overall resize2fs", fs
->io
);
121 init_resource_track(&rtrack
, "read_bitmaps", fs
->io
);
122 retval
= ext2fs_read_bitmaps(fs
);
125 print_resource_track(rfs
, &rtrack
, fs
->io
);
127 fs
->super
->s_state
|= EXT2_ERROR_FS
;
128 ext2fs_mark_super_dirty(fs
);
131 init_resource_track(&rtrack
, "fix_uninit_block_bitmaps 1", fs
->io
);
132 fix_uninit_block_bitmaps(fs
);
133 print_resource_track(rfs
, &rtrack
, fs
->io
);
134 retval
= ext2fs_dup_handle(fs
, &rfs
->new_fs
);
138 init_resource_track(&rtrack
, "resize_group_descriptors", fs
->io
);
139 retval
= resize_group_descriptors(rfs
, *new_size
);
142 print_resource_track(rfs
, &rtrack
, fs
->io
);
144 init_resource_track(&rtrack
, "move_bg_metadata", fs
->io
);
145 retval
= move_bg_metadata(rfs
);
148 print_resource_track(rfs
, &rtrack
, fs
->io
);
150 init_resource_track(&rtrack
, "zero_high_bits_in_metadata", fs
->io
);
151 retval
= zero_high_bits_in_inodes(rfs
);
154 print_resource_track(rfs
, &rtrack
, fs
->io
);
156 init_resource_track(&rtrack
, "adjust_superblock", fs
->io
);
157 retval
= adjust_superblock(rfs
, *new_size
);
160 print_resource_track(rfs
, &rtrack
, fs
->io
);
162 init_resource_track(&rtrack
, "fix_uninit_block_bitmaps 2", fs
->io
);
163 fix_uninit_block_bitmaps(rfs
->new_fs
);
164 print_resource_track(rfs
, &rtrack
, fs
->io
);
165 /* Clear the block bitmap uninit flag for the last block group */
166 ext2fs_bg_flags_clear(rfs
->new_fs
, rfs
->new_fs
->group_desc_count
- 1,
167 EXT2_BG_BLOCK_UNINIT
);
169 *new_size
= ext2fs_blocks_count(rfs
->new_fs
->super
);
171 init_resource_track(&rtrack
, "blocks_to_move", fs
->io
);
172 retval
= blocks_to_move(rfs
);
175 print_resource_track(rfs
, &rtrack
, fs
->io
);
177 #ifdef RESIZE2FS_DEBUG
178 if (rfs
->flags
& RESIZE_DEBUG_BMOVE
)
179 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
180 ext2fs_free_blocks_count(rfs
->old_fs
->super
),
181 ext2fs_free_blocks_count(rfs
->new_fs
->super
),
185 init_resource_track(&rtrack
, "block_mover", fs
->io
);
186 retval
= block_mover(rfs
);
189 print_resource_track(rfs
, &rtrack
, fs
->io
);
191 init_resource_track(&rtrack
, "inode_scan_and_fix", fs
->io
);
192 retval
= inode_scan_and_fix(rfs
);
195 print_resource_track(rfs
, &rtrack
, fs
->io
);
197 init_resource_track(&rtrack
, "inode_ref_fix", fs
->io
);
198 retval
= inode_ref_fix(rfs
);
201 print_resource_track(rfs
, &rtrack
, fs
->io
);
203 init_resource_track(&rtrack
, "move_itables", fs
->io
);
204 retval
= move_itables(rfs
);
207 print_resource_track(rfs
, &rtrack
, fs
->io
);
209 retval
= clear_sparse_super2_last_group(rfs
);
213 init_resource_track(&rtrack
, "calculate_summary_stats", fs
->io
);
214 retval
= ext2fs_calculate_summary_stats(rfs
->new_fs
);
217 print_resource_track(rfs
, &rtrack
, fs
->io
);
219 init_resource_track(&rtrack
, "fix_resize_inode", fs
->io
);
220 retval
= fix_resize_inode(rfs
->new_fs
);
223 print_resource_track(rfs
, &rtrack
, fs
->io
);
225 init_resource_track(&rtrack
, "fix_sb_journal_backup", fs
->io
);
226 retval
= fix_sb_journal_backup(rfs
->new_fs
);
229 print_resource_track(rfs
, &rtrack
, fs
->io
);
231 retval
= ext2fs_set_gdt_csum(rfs
->new_fs
);
235 rfs
->new_fs
->super
->s_state
&= ~EXT2_ERROR_FS
;
236 rfs
->new_fs
->flags
&= ~EXT2_FLAG_MASTER_SB_ONLY
;
238 print_resource_track(rfs
, &overall_track
, fs
->io
);
239 retval
= ext2fs_close_free(&rfs
->new_fs
);
245 ext2fs_free(rfs
->old_fs
);
248 ext2fs_free_mem(&rfs
->itable_buf
);
249 if (rfs
->reserve_blocks
)
250 ext2fs_free_block_bitmap(rfs
->reserve_blocks
);
251 if (rfs
->move_blocks
)
252 ext2fs_free_block_bitmap(rfs
->move_blocks
);
253 ext2fs_free_mem(&rfs
);
259 ext2fs_free(rfs
->new_fs
);
263 ext2fs_free_mem(&rfs
->itable_buf
);
264 ext2fs_free_mem(&rfs
);
268 /* Keep the size of the group descriptor region constant */
269 static void adjust_reserved_gdt_blocks(ext2_filsys old_fs
, ext2_filsys fs
)
271 if (ext2fs_has_feature_resize_inode(fs
->super
) &&
272 (old_fs
->desc_blocks
!= fs
->desc_blocks
)) {
275 new = ((int) fs
->super
->s_reserved_gdt_blocks
) +
276 (old_fs
->desc_blocks
- fs
->desc_blocks
);
279 if (new > (int) fs
->blocksize
/4)
280 new = fs
->blocksize
/4;
281 fs
->super
->s_reserved_gdt_blocks
= new;
285 /* Toggle 64bit mode */
286 static errcode_t
resize_group_descriptors(ext2_resize_t rfs
, blk64_t new_size
)
288 void *o
, *n
, *new_group_desc
;
293 if (!(rfs
->flags
& (RESIZE_DISABLE_64BIT
| RESIZE_ENABLE_64BIT
)))
296 if (new_size
!= ext2fs_blocks_count(rfs
->new_fs
->super
) ||
297 ext2fs_blocks_count(rfs
->new_fs
->super
) >= (1ULL << 32) ||
298 (rfs
->flags
& RESIZE_DISABLE_64BIT
&&
299 rfs
->flags
& RESIZE_ENABLE_64BIT
))
300 return EXT2_ET_INVALID_ARGUMENT
;
302 if (rfs
->flags
& RESIZE_DISABLE_64BIT
) {
303 ext2fs_clear_feature_64bit(rfs
->new_fs
->super
);
304 rfs
->new_fs
->super
->s_desc_size
= EXT2_MIN_DESC_SIZE
;
305 } else if (rfs
->flags
& RESIZE_ENABLE_64BIT
) {
306 ext2fs_set_feature_64bit(rfs
->new_fs
->super
);
307 rfs
->new_fs
->super
->s_desc_size
= EXT2_MIN_DESC_SIZE_64BIT
;
310 if (EXT2_DESC_SIZE(rfs
->old_fs
->super
) ==
311 EXT2_DESC_SIZE(rfs
->new_fs
->super
))
314 o
= rfs
->new_fs
->group_desc
;
315 rfs
->new_fs
->desc_blocks
= ext2fs_div_ceil(
316 rfs
->old_fs
->group_desc_count
,
317 EXT2_DESC_PER_BLOCK(rfs
->new_fs
->super
));
318 retval
= ext2fs_get_arrayzero(rfs
->new_fs
->desc_blocks
,
319 rfs
->old_fs
->blocksize
, &new_group_desc
);
325 if (EXT2_DESC_SIZE(rfs
->old_fs
->super
) <=
326 EXT2_DESC_SIZE(rfs
->new_fs
->super
))
327 copy_size
= EXT2_DESC_SIZE(rfs
->old_fs
->super
);
329 copy_size
= EXT2_DESC_SIZE(rfs
->new_fs
->super
);
330 for (i
= 0; i
< rfs
->old_fs
->group_desc_count
; i
++) {
331 memcpy(n
, o
, copy_size
);
332 n
= (char *)n
+ EXT2_DESC_SIZE(rfs
->new_fs
->super
);
333 o
= (char *)o
+ EXT2_DESC_SIZE(rfs
->old_fs
->super
);
336 ext2fs_free_mem(&rfs
->new_fs
->group_desc
);
337 rfs
->new_fs
->group_desc
= new_group_desc
;
339 for (i
= 0; i
< rfs
->old_fs
->group_desc_count
; i
++)
340 ext2fs_group_desc_csum_set(rfs
->new_fs
, i
);
342 adjust_reserved_gdt_blocks(rfs
->old_fs
, rfs
->new_fs
);
347 /* Move bitmaps/inode tables out of the way. */
348 static errcode_t
move_bg_metadata(ext2_resize_t rfs
)
351 blk64_t b
, c
, d
, old_desc_blocks
, new_desc_blocks
, j
;
352 ext2fs_block_bitmap old_map
, new_map
;
357 if (!(rfs
->flags
& (RESIZE_DISABLE_64BIT
| RESIZE_ENABLE_64BIT
)))
360 retval
= ext2fs_allocate_block_bitmap(rfs
->old_fs
, "oldfs", &old_map
);
364 retval
= ext2fs_allocate_block_bitmap(rfs
->new_fs
, "newfs", &new_map
);
368 if (ext2fs_has_feature_meta_bg(rfs
->old_fs
->super
)) {
369 old_desc_blocks
= rfs
->old_fs
->super
->s_first_meta_bg
;
370 new_desc_blocks
= rfs
->new_fs
->super
->s_first_meta_bg
;
372 old_desc_blocks
= rfs
->old_fs
->desc_blocks
+
373 rfs
->old_fs
->super
->s_reserved_gdt_blocks
;
374 new_desc_blocks
= rfs
->new_fs
->desc_blocks
+
375 rfs
->new_fs
->super
->s_reserved_gdt_blocks
;
378 /* Construct bitmaps of super/descriptor blocks in old and new fs */
379 for (i
= 0; i
< rfs
->old_fs
->group_desc_count
; i
++) {
380 retval
= ext2fs_super_and_bgd_loc2(rfs
->old_fs
, i
, &b
, &c
, &d
,
385 ext2fs_mark_block_bitmap2(old_map
, b
);
386 for (j
= 0; c
!= 0 && j
< old_desc_blocks
; j
++)
387 ext2fs_mark_block_bitmap2(old_map
, c
+ j
);
389 ext2fs_mark_block_bitmap2(old_map
, d
);
391 retval
= ext2fs_super_and_bgd_loc2(rfs
->new_fs
, i
, &b
, &c
, &d
,
396 ext2fs_mark_block_bitmap2(new_map
, b
);
397 for (j
= 0; c
!= 0 && j
< new_desc_blocks
; j
++)
398 ext2fs_mark_block_bitmap2(new_map
, c
+ j
);
400 ext2fs_mark_block_bitmap2(new_map
, d
);
403 cluster_ratio
= EXT2FS_CLUSTER_RATIO(rfs
->new_fs
);
405 /* Find changes in block allocations for bg metadata */
406 for (b
= EXT2FS_B2C(rfs
->old_fs
,
407 rfs
->old_fs
->super
->s_first_data_block
);
408 b
< ext2fs_blocks_count(rfs
->new_fs
->super
);
409 b
+= cluster_ratio
) {
410 old
= ext2fs_test_block_bitmap2(old_map
, b
);
411 new = ext2fs_test_block_bitmap2(new_map
, b
);
414 /* mark old_map, unmark new_map */
415 if (cluster_ratio
== 1)
416 ext2fs_unmark_block_bitmap2(
417 rfs
->new_fs
->block_map
, b
);
418 } else if (!old
&& new)
419 ; /* unmark old_map, mark new_map */
421 ext2fs_unmark_block_bitmap2(old_map
, b
);
422 ext2fs_unmark_block_bitmap2(new_map
, b
);
427 * new_map now shows blocks that have been newly allocated.
428 * old_map now shows blocks that have been newly freed.
432 * Move any conflicting bitmaps and inode tables. Ensure that we
433 * don't try to free clusters associated with bitmaps or tables.
435 for (i
= 0; i
< rfs
->old_fs
->group_desc_count
; i
++) {
436 b
= ext2fs_block_bitmap_loc(rfs
->new_fs
, i
);
437 if (ext2fs_test_block_bitmap2(new_map
, b
))
438 ext2fs_block_bitmap_loc_set(rfs
->new_fs
, i
, 0);
439 else if (ext2fs_test_block_bitmap2(old_map
, b
))
440 ext2fs_unmark_block_bitmap2(old_map
, b
);
442 b
= ext2fs_inode_bitmap_loc(rfs
->new_fs
, i
);
443 if (ext2fs_test_block_bitmap2(new_map
, b
))
444 ext2fs_inode_bitmap_loc_set(rfs
->new_fs
, i
, 0);
445 else if (ext2fs_test_block_bitmap2(old_map
, b
))
446 ext2fs_unmark_block_bitmap2(old_map
, b
);
448 c
= ext2fs_inode_table_loc(rfs
->new_fs
, i
);
450 b
< rfs
->new_fs
->inode_blocks_per_group
;
452 if (ext2fs_test_block_bitmap2(new_map
, b
+ c
))
453 ext2fs_inode_table_loc_set(rfs
->new_fs
, i
, 0);
454 else if (ext2fs_test_block_bitmap2(old_map
, b
+ c
))
455 ext2fs_unmark_block_bitmap2(old_map
, b
+ c
);
459 /* Free unused clusters */
461 cluster_ratio
> 1 && b
< ext2fs_blocks_count(rfs
->new_fs
->super
);
463 if (ext2fs_test_block_bitmap2(old_map
, b
))
464 ext2fs_unmark_block_bitmap2(rfs
->new_fs
->block_map
, b
);
467 ext2fs_free_block_bitmap(old_map
);
469 ext2fs_free_block_bitmap(new_map
);
473 /* Zero out the high bits of extent fields */
474 static errcode_t
zero_high_bits_in_extents(ext2_filsys fs
, ext2_ino_t ino
,
475 struct ext2_inode
*inode
)
477 ext2_extent_handle_t handle
;
478 struct ext2fs_extent extent
;
479 int op
= EXT2_EXTENT_ROOT
;
482 if (!(inode
->i_flags
& EXT4_EXTENTS_FL
))
485 errcode
= ext2fs_extent_open(fs
, ino
, &handle
);
490 errcode
= ext2fs_extent_get(handle
, op
, &extent
);
494 op
= EXT2_EXTENT_NEXT_SIB
;
496 if (extent
.e_pblk
> (1ULL << 32)) {
497 extent
.e_pblk
&= (1ULL << 32) - 1;
498 errcode
= ext2fs_extent_replace(handle
, 0, &extent
);
504 /* Ok if we run off the end */
505 if (errcode
== EXT2_ET_EXTENT_NO_NEXT
)
507 ext2fs_extent_free(handle
);
511 /* Zero out the high bits of inodes. */
512 static errcode_t
zero_high_bits_in_inodes(ext2_resize_t rfs
)
514 ext2_filsys fs
= rfs
->old_fs
;
515 int length
= EXT2_INODE_SIZE(fs
->super
);
516 struct ext2_inode
*inode
= NULL
;
517 ext2_inode_scan scan
= NULL
;
521 if (!(rfs
->flags
& (RESIZE_DISABLE_64BIT
| RESIZE_ENABLE_64BIT
)))
524 if (fs
->super
->s_creator_os
== EXT2_OS_HURD
)
527 retval
= ext2fs_open_inode_scan(fs
, 0, &scan
);
531 retval
= ext2fs_get_mem(length
, &inode
);
536 retval
= ext2fs_get_next_inode_full(scan
, &ino
, inode
, length
);
541 if (!ext2fs_test_inode_bitmap2(fs
->inode_map
, ino
))
545 * Here's how we deal with high block number fields:
547 * - i_size_high has been been written out with i_size_lo
548 * since the ext2 days, so no conversion is needed.
550 * - i_blocks_hi is guarded by both the huge_file feature and
551 * inode flags and has always been written out with
552 * i_blocks_lo if the feature is set. The field is only
553 * ever read if both feature and inode flag are set, so
554 * we don't need to zero it now.
556 * - i_file_acl_high can be uninitialized, so zero it if
559 if (inode
->osd2
.linux2
.l_i_file_acl_high
) {
560 inode
->osd2
.linux2
.l_i_file_acl_high
= 0;
561 retval
= ext2fs_write_inode_full(fs
, ino
, inode
,
567 retval
= zero_high_bits_in_extents(fs
, ino
, inode
);
574 ext2fs_free_mem(&inode
);
576 ext2fs_close_inode_scan(scan
);
581 * Clean up the bitmaps for unitialized bitmaps
583 static void fix_uninit_block_bitmaps(ext2_filsys fs
)
589 if (!ext2fs_has_group_desc_csum(fs
))
592 for (g
=0; g
< fs
->group_desc_count
; g
++) {
593 if (!(ext2fs_bg_flags_test(fs
, g
, EXT2_BG_BLOCK_UNINIT
)))
596 blk
= ext2fs_group_first_block2(fs
, g
);
597 lblk
= ext2fs_group_last_block2(fs
, g
);
598 ext2fs_unmark_block_bitmap_range2(fs
->block_map
, blk
,
601 ext2fs_reserve_super_and_bgd(fs
, g
, fs
->block_map
);
602 ext2fs_mark_block_bitmap2(fs
->block_map
,
603 ext2fs_block_bitmap_loc(fs
, g
));
604 ext2fs_mark_block_bitmap2(fs
->block_map
,
605 ext2fs_inode_bitmap_loc(fs
, g
));
606 for (i
= 0, blk
= ext2fs_inode_table_loc(fs
, g
);
607 i
< fs
->inode_blocks_per_group
;
609 ext2fs_mark_block_bitmap2(fs
->block_map
, blk
);
613 /* --------------------------------------------------------------------
615 * Resize processing, phase 1.
617 * In this phase we adjust the in-memory superblock information, and
618 * initialize any new parts of the inode table. The new parts of the
619 * inode table are created in virgin disk space, so we can abort here
620 * without any side effects.
621 * --------------------------------------------------------------------
625 * If the group descriptor's bitmap and inode table blocks are valid,
626 * release them in the new filesystem data structure, and mark them as
627 * reserved so the old inode table blocks don't get overwritten.
629 static errcode_t
free_gdp_blocks(ext2_filsys fs
,
630 ext2fs_block_bitmap reserve_blocks
,
637 ext2fs_block_bitmap bg_map
= NULL
;
638 errcode_t retval
= 0;
639 dgrp_t count
= old_fs
->group_desc_count
- fs
->group_desc_count
;
641 /* If bigalloc, don't free metadata living in the same cluster */
642 if (EXT2FS_CLUSTER_RATIO(fs
) > 1) {
643 retval
= ext2fs_allocate_block_bitmap(fs
, "bgdata", &bg_map
);
647 retval
= mark_table_blocks(fs
, bg_map
);
652 for (i
= group
; i
< group
+ count
; i
++) {
653 blk
= ext2fs_block_bitmap_loc(old_fs
, i
);
655 (blk
< ext2fs_blocks_count(fs
->super
)) &&
656 !(bg_map
&& ext2fs_test_block_bitmap2(bg_map
, blk
))) {
657 ext2fs_block_alloc_stats2(fs
, blk
, -1);
658 ext2fs_mark_block_bitmap2(reserve_blocks
, blk
);
661 blk
= ext2fs_inode_bitmap_loc(old_fs
, i
);
663 (blk
< ext2fs_blocks_count(fs
->super
)) &&
664 !(bg_map
&& ext2fs_test_block_bitmap2(bg_map
, blk
))) {
665 ext2fs_block_alloc_stats2(fs
, blk
, -1);
666 ext2fs_mark_block_bitmap2(reserve_blocks
, blk
);
669 blk
= ext2fs_inode_table_loc(old_fs
, i
);
671 j
< fs
->inode_blocks_per_group
; j
++, blk
++) {
672 if (blk
>= ext2fs_blocks_count(fs
->super
) ||
673 (bg_map
&& ext2fs_test_block_bitmap2(bg_map
, blk
)))
675 ext2fs_block_alloc_stats2(fs
, blk
, -1);
676 ext2fs_mark_block_bitmap2(reserve_blocks
, blk
);
682 ext2fs_free_block_bitmap(bg_map
);
687 * This routine is shared by the online and offline resize routines.
688 * All of the information which is adjusted in memory is done here.
690 errcode_t
adjust_fs_info(ext2_filsys fs
, ext2_filsys old_fs
,
691 ext2fs_block_bitmap reserve_blocks
, blk64_t new_size
)
694 blk64_t overhead
= 0;
696 blk64_t blk
, group_block
;
698 blk64_t old_numblocks
, numblocks
, adjblocks
;
699 unsigned long i
, j
, old_desc_blocks
;
700 unsigned int meta_bg
, meta_bg_size
;
701 int has_super
, csum_flag
, has_bg
;
702 unsigned long long new_inodes
; /* u64 to check for overflow */
705 ext2fs_blocks_count_set(fs
->super
, new_size
);
708 fs
->group_desc_count
= ext2fs_div64_ceil(ext2fs_blocks_count(fs
->super
) -
709 fs
->super
->s_first_data_block
,
710 EXT2_BLOCKS_PER_GROUP(fs
->super
));
711 if (fs
->group_desc_count
== 0)
712 return EXT2_ET_TOOSMALL
;
713 fs
->desc_blocks
= ext2fs_div_ceil(fs
->group_desc_count
,
714 EXT2_DESC_PER_BLOCK(fs
->super
));
717 * Overhead is the number of bookkeeping blocks per group. It
718 * includes the superblock backup, the group descriptor
719 * backups, the inode bitmap, the block bitmap, and the inode
722 overhead
= (int) (2 + fs
->inode_blocks_per_group
);
725 if (ext2fs_has_feature_sparse_super2(fs
->super
)) {
727 * We have to do this manually since
728 * super->s_backup_bgs hasn't been set up yet.
730 if (fs
->group_desc_count
== 2)
731 has_bg
= fs
->super
->s_backup_bgs
[0] != 0;
733 has_bg
= fs
->super
->s_backup_bgs
[1] != 0;
735 has_bg
= ext2fs_bg_has_super(fs
, fs
->group_desc_count
- 1);
737 overhead
+= 1 + fs
->desc_blocks
+
738 fs
->super
->s_reserved_gdt_blocks
;
741 * See if the last group is big enough to support the
742 * necessary data structures. If not, we need to get rid of
745 rem
= (ext2fs_blocks_count(fs
->super
) - fs
->super
->s_first_data_block
) %
746 fs
->super
->s_blocks_per_group
;
747 if ((fs
->group_desc_count
== 1) && rem
&& (rem
< overhead
))
748 return EXT2_ET_TOOSMALL
;
749 if ((fs
->group_desc_count
> 1) && rem
&& (rem
< overhead
+50)) {
750 ext2fs_blocks_count_set(fs
->super
,
751 ext2fs_blocks_count(fs
->super
) - rem
);
755 * Adjust the number of inodes
757 new_inodes
=(unsigned long long) fs
->super
->s_inodes_per_group
* fs
->group_desc_count
;
758 if (new_inodes
> ~0U) {
759 fprintf(stderr
, _("inodes (%llu) must be less than %u"),
761 return EXT2_ET_TOO_MANY_INODES
;
763 fs
->super
->s_inodes_count
= fs
->super
->s_inodes_per_group
*
764 fs
->group_desc_count
;
767 * Adjust the number of free blocks
769 blk
= ext2fs_blocks_count(old_fs
->super
);
770 if (blk
> ext2fs_blocks_count(fs
->super
))
771 ext2fs_free_blocks_count_set(fs
->super
,
772 ext2fs_free_blocks_count(fs
->super
) -
773 (blk
- ext2fs_blocks_count(fs
->super
)));
775 ext2fs_free_blocks_count_set(fs
->super
,
776 ext2fs_free_blocks_count(fs
->super
) +
777 (ext2fs_blocks_count(fs
->super
) - blk
));
780 * Adjust the number of reserved blocks
782 percent
= (ext2fs_r_blocks_count(old_fs
->super
) * 100.0) /
783 ext2fs_blocks_count(old_fs
->super
);
784 ext2fs_r_blocks_count_set(fs
->super
,
785 (percent
* ext2fs_blocks_count(fs
->super
) /
789 * Adjust the bitmaps for size
791 retval
= ext2fs_resize_inode_bitmap2(fs
->super
->s_inodes_count
,
792 fs
->super
->s_inodes_count
,
794 if (retval
) goto errout
;
796 real_end
= EXT2_GROUPS_TO_BLOCKS(fs
->super
, fs
->group_desc_count
) - 1 +
797 fs
->super
->s_first_data_block
;
798 retval
= ext2fs_resize_block_bitmap2(new_size
- 1,
799 real_end
, fs
->block_map
);
800 if (retval
) goto errout
;
803 * If we are growing the file system, also grow the size of
804 * the reserve_blocks bitmap
806 if (reserve_blocks
&& new_size
> ext2fs_blocks_count(old_fs
->super
)) {
807 retval
= ext2fs_resize_block_bitmap2(new_size
- 1,
808 real_end
, reserve_blocks
);
809 if (retval
) goto errout
;
813 * Reallocate the group descriptors as necessary.
815 if (EXT2_DESC_SIZE(old_fs
->super
) == EXT2_DESC_SIZE(fs
->super
) &&
816 old_fs
->desc_blocks
!= fs
->desc_blocks
) {
817 retval
= ext2fs_resize_mem(old_fs
->desc_blocks
*
819 fs
->desc_blocks
* fs
->blocksize
,
823 if (fs
->desc_blocks
> old_fs
->desc_blocks
)
824 memset((char *) fs
->group_desc
+
825 (old_fs
->desc_blocks
* fs
->blocksize
), 0,
826 (fs
->desc_blocks
- old_fs
->desc_blocks
) *
831 * If the resize_inode feature is set, and we are changing the
832 * number of descriptor blocks, then adjust
833 * s_reserved_gdt_blocks if possible to avoid needing to move
834 * the inode table either now or in the future.
836 * Note: If we're converting to 64bit mode, we did this earlier.
838 if (EXT2_DESC_SIZE(old_fs
->super
) == EXT2_DESC_SIZE(fs
->super
))
839 adjust_reserved_gdt_blocks(old_fs
, fs
);
841 if (ext2fs_has_feature_meta_bg(fs
->super
) &&
842 (fs
->super
->s_first_meta_bg
> fs
->desc_blocks
)) {
843 ext2fs_clear_feature_meta_bg(fs
->super
);
844 fs
->super
->s_first_meta_bg
= 0;
848 * Update the location of the backup superblocks if the
849 * sparse_super2 feature is enabled.
851 if (ext2fs_has_feature_sparse_super2(fs
->super
)) {
852 dgrp_t last_bg
= fs
->group_desc_count
- 1;
853 dgrp_t old_last_bg
= old_fs
->group_desc_count
- 1;
855 if (last_bg
> old_last_bg
) {
856 if (old_fs
->group_desc_count
== 1)
857 fs
->super
->s_backup_bgs
[0] = 1;
858 if ((old_fs
->group_desc_count
< 3 &&
859 fs
->group_desc_count
> 2) ||
860 fs
->super
->s_backup_bgs
[1])
861 fs
->super
->s_backup_bgs
[1] = last_bg
;
862 } else if (last_bg
< old_last_bg
) {
863 if (fs
->super
->s_backup_bgs
[0] > last_bg
)
864 fs
->super
->s_backup_bgs
[0] = 0;
865 if (fs
->super
->s_backup_bgs
[1] > last_bg
)
866 fs
->super
->s_backup_bgs
[1] = 0;
868 old_fs
->super
->s_backup_bgs
[1] == old_last_bg
)
869 fs
->super
->s_backup_bgs
[1] = last_bg
;
874 * If we are shrinking the number of block groups, we're done
877 if (old_fs
->group_desc_count
> fs
->group_desc_count
) {
879 * Check the block groups that we are chopping off
880 * and free any blocks associated with their metadata
882 retval
= free_gdp_blocks(fs
, reserve_blocks
, old_fs
,
883 fs
->group_desc_count
);
888 * Fix the count of the last (old) block group
890 old_numblocks
= (ext2fs_blocks_count(old_fs
->super
) -
891 old_fs
->super
->s_first_data_block
) %
892 old_fs
->super
->s_blocks_per_group
;
894 old_numblocks
= old_fs
->super
->s_blocks_per_group
;
895 if (old_fs
->group_desc_count
== fs
->group_desc_count
) {
896 numblocks
= (ext2fs_blocks_count(fs
->super
) -
897 fs
->super
->s_first_data_block
) %
898 fs
->super
->s_blocks_per_group
;
900 numblocks
= fs
->super
->s_blocks_per_group
;
902 numblocks
= fs
->super
->s_blocks_per_group
;
903 i
= old_fs
->group_desc_count
- 1;
904 ext2fs_bg_free_blocks_count_set(fs
, i
, ext2fs_bg_free_blocks_count(fs
, i
) + (numblocks
- old_numblocks
));
905 ext2fs_group_desc_csum_set(fs
, i
);
908 * If the number of block groups is staying the same, we're
909 * done and can exit now. (If the number block groups is
910 * shrinking, we had exited earlier.)
912 if (old_fs
->group_desc_count
>= fs
->group_desc_count
) {
918 * Initialize the new block group descriptors
920 group_block
= ext2fs_group_first_block2(fs
,
921 old_fs
->group_desc_count
);
922 csum_flag
= ext2fs_has_group_desc_csum(fs
);
923 if (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
924 access("/sys/fs/ext4/features/lazy_itable_init", F_OK
) == 0)
925 lazy_itable_init
= 1;
926 if (ext2fs_has_feature_meta_bg(fs
->super
))
927 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
929 old_desc_blocks
= fs
->desc_blocks
+
930 fs
->super
->s_reserved_gdt_blocks
;
933 * If we changed the number of block_group descriptor blocks,
934 * we need to make sure they are all marked as reserved in the
935 * file systems's block allocation map.
937 for (i
= 0; i
< old_fs
->group_desc_count
; i
++)
938 ext2fs_reserve_super_and_bgd(fs
, i
, fs
->block_map
);
940 for (i
= old_fs
->group_desc_count
;
941 i
< fs
->group_desc_count
; i
++) {
942 memset(ext2fs_group_desc(fs
, fs
->group_desc
, i
), 0,
943 sizeof(struct ext2_group_desc
));
946 ext2fs_bg_flags_zap(fs
, i
);
948 ext2fs_bg_flags_set(fs
, i
, EXT2_BG_INODE_UNINIT
);
949 if (!lazy_itable_init
)
950 ext2fs_bg_flags_set(fs
, i
,
951 EXT2_BG_INODE_ZEROED
);
952 ext2fs_bg_itable_unused_set(fs
, i
,
953 fs
->super
->s_inodes_per_group
);
956 numblocks
= ext2fs_group_blocks_count(fs
, i
);
957 if ((i
< fs
->group_desc_count
- 1) && csum_flag
)
958 ext2fs_bg_flags_set(fs
, i
, EXT2_BG_BLOCK_UNINIT
);
960 has_super
= ext2fs_bg_has_super(fs
, i
);
962 ext2fs_block_alloc_stats2(fs
, group_block
, +1);
965 meta_bg_size
= EXT2_DESC_PER_BLOCK(fs
->super
);
966 meta_bg
= i
/ meta_bg_size
;
967 if (!ext2fs_has_feature_meta_bg(fs
->super
) ||
968 (meta_bg
< fs
->super
->s_first_meta_bg
)) {
970 for (j
=0; j
< old_desc_blocks
; j
++)
971 ext2fs_block_alloc_stats2(fs
,
972 group_block
+ 1 + j
, +1);
973 adjblocks
+= old_desc_blocks
;
978 if (((i
% meta_bg_size
) == 0) ||
979 ((i
% meta_bg_size
) == 1) ||
980 ((i
% meta_bg_size
) == (meta_bg_size
-1)))
981 ext2fs_block_alloc_stats2(fs
,
982 group_block
+ has_super
, +1);
985 adjblocks
+= 2 + fs
->inode_blocks_per_group
;
987 numblocks
-= adjblocks
;
988 ext2fs_free_blocks_count_set(fs
->super
,
989 ext2fs_free_blocks_count(fs
->super
) - adjblocks
);
990 fs
->super
->s_free_inodes_count
+=
991 fs
->super
->s_inodes_per_group
;
992 ext2fs_bg_free_blocks_count_set(fs
, i
, numblocks
);
993 ext2fs_bg_free_inodes_count_set(fs
, i
,
994 fs
->super
->s_inodes_per_group
);
995 ext2fs_bg_used_dirs_count_set(fs
, i
, 0);
996 ext2fs_group_desc_csum_set(fs
, i
);
998 retval
= ext2fs_allocate_group_table(fs
, i
, 0);
999 if (retval
) goto errout
;
1001 group_block
+= fs
->super
->s_blocks_per_group
;
1006 * Mark all of the metadata blocks as reserved so they won't
1007 * get allocated by the call to ext2fs_allocate_group_table()
1008 * in blocks_to_move(), where we allocate new blocks to
1009 * replace those allocation bitmap and inode table blocks
1010 * which have to get relocated to make space for an increased
1011 * number of the block group descriptors.
1014 mark_table_blocks(fs
, reserve_blocks
);
1021 * This routine adjusts the superblock and other data structures, both
1022 * in disk as well as in memory...
1024 static errcode_t
adjust_superblock(ext2_resize_t rfs
, blk64_t new_size
)
1026 ext2_filsys fs
= rfs
->new_fs
;
1029 blk64_t group_block
;
1031 unsigned long max_group
;
1033 ext2fs_mark_super_dirty(fs
);
1034 ext2fs_mark_bb_dirty(fs
);
1035 ext2fs_mark_ib_dirty(fs
);
1037 retval
= ext2fs_allocate_block_bitmap(fs
, _("reserved blocks"),
1038 &rfs
->reserve_blocks
);
1042 retval
= adjust_fs_info(fs
, rfs
->old_fs
, rfs
->reserve_blocks
, new_size
);
1047 * Check to make sure there are enough inodes
1049 if ((rfs
->old_fs
->super
->s_inodes_count
-
1050 rfs
->old_fs
->super
->s_free_inodes_count
) >
1051 rfs
->new_fs
->super
->s_inodes_count
) {
1057 * If we are shrinking the number block groups, we're done and
1060 if (rfs
->old_fs
->group_desc_count
> fs
->group_desc_count
) {
1066 * If the number of block groups is staying the same, we're
1067 * done and can exit now. (If the number block groups is
1068 * shrinking, we had exited earlier.)
1070 if (rfs
->old_fs
->group_desc_count
>= fs
->group_desc_count
) {
1076 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1077 * supports lazy inode initialization, we can skip
1078 * initializing the inode table.
1080 if (lazy_itable_init
&& ext2fs_has_group_desc_csum(fs
)) {
1086 * Initialize the inode table
1088 retval
= ext2fs_get_array(fs
->blocksize
, fs
->inode_blocks_per_group
,
1093 memset(rfs
->itable_buf
, 0, fs
->blocksize
* fs
->inode_blocks_per_group
);
1094 group_block
= ext2fs_group_first_block2(fs
,
1095 rfs
->old_fs
->group_desc_count
);
1096 adj
= rfs
->old_fs
->group_desc_count
;
1097 max_group
= fs
->group_desc_count
- adj
;
1098 if (rfs
->progress
) {
1099 retval
= rfs
->progress(rfs
, E2_RSZ_EXTEND_ITABLE_PASS
,
1104 for (i
= rfs
->old_fs
->group_desc_count
;
1105 i
< fs
->group_desc_count
; i
++) {
1107 * Write out the new inode table
1109 retval
= ext2fs_zero_blocks2(fs
, ext2fs_inode_table_loc(fs
, i
),
1110 fs
->inode_blocks_per_group
, NULL
,
1115 io_channel_flush(fs
->io
);
1116 if (rfs
->progress
) {
1117 retval
= rfs
->progress(rfs
, E2_RSZ_EXTEND_ITABLE_PASS
,
1118 i
- adj
+ 1, max_group
);
1122 group_block
+= fs
->super
->s_blocks_per_group
;
1124 io_channel_flush(fs
->io
);
1131 /* --------------------------------------------------------------------
1133 * Resize processing, phase 2.
1135 * In this phase we adjust determine which blocks need to be moved, in
1136 * blocks_to_move(). We then copy the blocks to their ultimate new
1137 * destinations using block_mover(). Since we are copying blocks to
1138 * their new locations, again during this pass we can abort without
1140 * --------------------------------------------------------------------
1144 * This helper function creates a block bitmap with all of the
1145 * filesystem meta-data blocks.
1147 static errcode_t
mark_table_blocks(ext2_filsys fs
,
1148 ext2fs_block_bitmap bmap
)
1153 for (i
= 0; i
< fs
->group_desc_count
; i
++) {
1154 ext2fs_reserve_super_and_bgd(fs
, i
, bmap
);
1157 * Mark the blocks used for the inode table
1159 blk
= ext2fs_inode_table_loc(fs
, i
);
1161 ext2fs_mark_block_bitmap_range2(bmap
, blk
,
1162 fs
->inode_blocks_per_group
);
1165 * Mark block used for the block bitmap
1167 blk
= ext2fs_block_bitmap_loc(fs
, i
);
1169 ext2fs_mark_block_bitmap2(bmap
, blk
);
1172 * Mark block used for the inode bitmap
1174 blk
= ext2fs_inode_bitmap_loc(fs
, i
);
1176 ext2fs_mark_block_bitmap2(bmap
, blk
);
1182 * This function checks to see if a particular block (either a
1183 * superblock or a block group descriptor) overlaps with an inode or
1184 * block bitmap block, or with the inode table.
1186 static void mark_fs_metablock(ext2_resize_t rfs
,
1187 ext2fs_block_bitmap meta_bmap
,
1188 int group
, blk64_t blk
)
1190 ext2_filsys fs
= rfs
->new_fs
;
1192 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
1193 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1196 * Check to see if we overlap with the inode or block bitmap,
1197 * or the inode tables. If not, and the block is in use, then
1198 * mark it as a block to be moved.
1200 if (is_block_bm(fs
, group
, blk
)) {
1201 ext2fs_block_bitmap_loc_set(fs
, group
, 0);
1202 rfs
->needed_blocks
++;
1205 if (is_inode_bm(fs
, group
, blk
)) {
1206 ext2fs_inode_bitmap_loc_set(fs
, group
, 0);
1207 rfs
->needed_blocks
++;
1210 if (is_inode_tb(fs
, group
, blk
)) {
1211 ext2fs_inode_table_loc_set(fs
, group
, 0);
1212 rfs
->needed_blocks
++;
1215 if (ext2fs_has_feature_flex_bg(fs
->super
)) {
1218 for (i
= 0; i
< rfs
->old_fs
->group_desc_count
; i
++) {
1219 if (is_block_bm(fs
, i
, blk
)) {
1220 ext2fs_block_bitmap_loc_set(fs
, i
, 0);
1221 rfs
->needed_blocks
++;
1224 if (is_inode_bm(fs
, i
, blk
)) {
1225 ext2fs_inode_bitmap_loc_set(fs
, i
, 0);
1226 rfs
->needed_blocks
++;
1229 if (is_inode_tb(fs
, i
, blk
)) {
1230 ext2fs_inode_table_loc_set(fs
, i
, 0);
1231 rfs
->needed_blocks
++;
1237 if (ext2fs_has_group_desc_csum(fs
) &&
1238 (ext2fs_bg_flags_test(fs
, group
, EXT2_BG_BLOCK_UNINIT
))) {
1240 * If the block bitmap is uninitialized, which means
1241 * nothing other than standard metadata in use.
1244 } else if (ext2fs_test_block_bitmap2(rfs
->old_fs
->block_map
, blk
) &&
1245 !ext2fs_test_block_bitmap2(meta_bmap
, blk
)) {
1246 ext2fs_mark_block_bitmap2(rfs
->move_blocks
, blk
);
1247 rfs
->needed_blocks
++;
1253 * This routine marks and unmarks reserved blocks in the new block
1254 * bitmap. It also determines which blocks need to be moved and
1255 * places this information into the move_blocks bitmap.
1257 static errcode_t
blocks_to_move(ext2_resize_t rfs
)
1261 dgrp_t i
, max_groups
, g
;
1262 blk64_t blk
, group_blk
;
1263 blk64_t old_blocks
, new_blocks
, group_end
, cluster_freed
;
1265 unsigned int meta_bg
, meta_bg_size
;
1267 ext2_filsys fs
, old_fs
;
1268 ext2fs_block_bitmap meta_bmap
, new_meta_bmap
= NULL
;
1272 old_fs
= rfs
->old_fs
;
1273 if (ext2fs_blocks_count(old_fs
->super
) > ext2fs_blocks_count(fs
->super
))
1276 retval
= ext2fs_allocate_block_bitmap(fs
, _("blocks to be moved"),
1281 retval
= ext2fs_allocate_block_bitmap(fs
, _("meta-data blocks"),
1286 retval
= mark_table_blocks(old_fs
, meta_bmap
);
1293 * If we're shrinking the filesystem, we need to move any
1294 * group's metadata blocks (either allocation bitmaps or the
1295 * inode table) which are beyond the end of the new
1298 new_size
= ext2fs_blocks_count(fs
->super
);
1299 if (new_size
< ext2fs_blocks_count(old_fs
->super
)) {
1300 for (g
= 0; g
< fs
->group_desc_count
; g
++) {
1303 * ext2fs_allocate_group_table will re-allocate any
1304 * metadata blocks whose location is set to zero.
1306 if (ext2fs_block_bitmap_loc(fs
, g
) >= new_size
) {
1307 ext2fs_block_bitmap_loc_set(fs
, g
, 0);
1310 if (ext2fs_inode_bitmap_loc(fs
, g
) >= new_size
) {
1311 ext2fs_inode_bitmap_loc_set(fs
, g
, 0);
1314 if ((ext2fs_inode_table_loc(fs
, g
) +
1315 fs
->inode_blocks_per_group
) > new_size
) {
1316 ext2fs_inode_table_loc_set(fs
, g
, 0);
1321 retval
= ext2fs_allocate_group_table(fs
, g
, 0);
1329 * If we're shrinking the filesystem, we need to move all of
1330 * the blocks that don't fit any more
1332 for (blk
= ext2fs_blocks_count(fs
->super
);
1333 blk
< ext2fs_blocks_count(old_fs
->super
); blk
++) {
1334 g
= ext2fs_group_of_blk2(fs
, blk
);
1335 if (ext2fs_has_group_desc_csum(fs
) &&
1336 ext2fs_bg_flags_test(old_fs
, g
, EXT2_BG_BLOCK_UNINIT
)) {
1338 * The block bitmap is uninitialized, so skip
1339 * to the next block group.
1341 blk
= ext2fs_group_first_block2(fs
, g
+1) - 1;
1344 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1345 !ext2fs_test_block_bitmap2(meta_bmap
, blk
)) {
1346 ext2fs_mark_block_bitmap2(rfs
->move_blocks
, blk
);
1347 rfs
->needed_blocks
++;
1349 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
1352 if (ext2fs_has_feature_meta_bg(old_fs
->super
))
1353 old_blocks
= old_fs
->super
->s_first_meta_bg
;
1355 old_blocks
= old_fs
->desc_blocks
+
1356 old_fs
->super
->s_reserved_gdt_blocks
;
1357 if (ext2fs_has_feature_meta_bg(fs
->super
))
1358 new_blocks
= fs
->super
->s_first_meta_bg
;
1360 new_blocks
= fs
->desc_blocks
+ fs
->super
->s_reserved_gdt_blocks
;
1362 retval
= reserve_sparse_super2_last_group(rfs
, meta_bmap
);
1366 if (EXT2_DESC_SIZE(rfs
->old_fs
->super
) ==
1367 EXT2_DESC_SIZE(rfs
->new_fs
->super
) &&
1368 old_blocks
== new_blocks
) {
1373 max_groups
= fs
->group_desc_count
;
1374 if (max_groups
> old_fs
->group_desc_count
)
1375 max_groups
= old_fs
->group_desc_count
;
1376 group_blk
= old_fs
->super
->s_first_data_block
;
1378 * If we're reducing the number of descriptor blocks, this
1379 * makes life easy. :-) We just have to mark some extra
1382 if (old_blocks
> new_blocks
) {
1383 if (EXT2FS_CLUSTER_RATIO(fs
) > 1) {
1384 retval
= ext2fs_allocate_block_bitmap(fs
,
1385 _("new meta blocks"),
1390 retval
= mark_table_blocks(fs
, new_meta_bmap
);
1395 for (i
= 0; i
< max_groups
; i
++) {
1396 if (!ext2fs_bg_has_super(old_fs
, i
)) {
1397 group_blk
+= fs
->super
->s_blocks_per_group
;
1400 group_end
= group_blk
+ 1 + old_blocks
;
1401 for (blk
= group_blk
+ 1 + new_blocks
;
1403 if (new_meta_bmap
== NULL
||
1404 !ext2fs_test_block_bitmap2(new_meta_bmap
,
1407 EXT2FS_CLUSTER_RATIO(fs
) -
1409 EXT2FS_CLUSTER_MASK(fs
));
1410 if (cluster_freed
> group_end
- blk
)
1411 cluster_freed
= group_end
- blk
;
1412 ext2fs_block_alloc_stats2(fs
, blk
, -1);
1413 blk
+= EXT2FS_CLUSTER_RATIO(fs
);
1414 rfs
->needed_blocks
-= cluster_freed
;
1417 rfs
->needed_blocks
--;
1420 group_blk
+= fs
->super
->s_blocks_per_group
;
1426 * If we're increasing the number of descriptor blocks, life
1427 * gets interesting....
1429 meta_bg_size
= EXT2_DESC_PER_BLOCK(fs
->super
);
1430 flex_bg
= ext2fs_has_feature_flex_bg(fs
->super
);
1431 /* first reserve all of the existing fs meta blocks */
1432 for (i
= 0; i
< max_groups
; i
++) {
1433 has_super
= ext2fs_bg_has_super(fs
, i
);
1435 mark_fs_metablock(rfs
, meta_bmap
, i
, group_blk
);
1437 meta_bg
= i
/ meta_bg_size
;
1438 if (!ext2fs_has_feature_meta_bg(fs
->super
) ||
1439 (meta_bg
< fs
->super
->s_first_meta_bg
)) {
1441 for (blk
= group_blk
+1;
1442 blk
< group_blk
+ 1 + new_blocks
; blk
++)
1443 mark_fs_metablock(rfs
, meta_bmap
,
1449 if (((i
% meta_bg_size
) == 0) ||
1450 ((i
% meta_bg_size
) == 1) ||
1451 ((i
% meta_bg_size
) == (meta_bg_size
-1)))
1452 mark_fs_metablock(rfs
, meta_bmap
, i
,
1453 group_blk
+ has_super
);
1457 * Reserve the existing meta blocks that we know
1458 * aren't to be moved.
1460 * For flex_bg file systems, in order to avoid
1461 * overwriting fs metadata (especially inode table
1462 * blocks) belonging to a different block group when
1463 * we are relocating the inode tables, we need to
1464 * reserve all existing fs metadata blocks.
1466 if (ext2fs_block_bitmap_loc(fs
, i
))
1467 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1468 ext2fs_block_bitmap_loc(fs
, i
));
1469 else if (flex_bg
&& i
< old_fs
->group_desc_count
)
1470 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1471 ext2fs_block_bitmap_loc(old_fs
, i
));
1473 if (ext2fs_inode_bitmap_loc(fs
, i
))
1474 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1475 ext2fs_inode_bitmap_loc(fs
, i
));
1476 else if (flex_bg
&& i
< old_fs
->group_desc_count
)
1477 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1478 ext2fs_inode_bitmap_loc(old_fs
, i
));
1480 if (ext2fs_inode_table_loc(fs
, i
))
1481 ext2fs_mark_block_bitmap_range2(rfs
->reserve_blocks
,
1482 ext2fs_inode_table_loc(fs
, i
),
1483 fs
->inode_blocks_per_group
);
1484 else if (flex_bg
&& i
< old_fs
->group_desc_count
)
1485 ext2fs_mark_block_bitmap_range2(rfs
->reserve_blocks
,
1486 ext2fs_inode_table_loc(old_fs
, i
),
1487 old_fs
->inode_blocks_per_group
);
1489 group_blk
+= rfs
->new_fs
->super
->s_blocks_per_group
;
1492 /* Allocate the missing data structures */
1493 for (i
= 0; i
< max_groups
; i
++) {
1494 if (ext2fs_inode_table_loc(fs
, i
) &&
1495 ext2fs_inode_bitmap_loc(fs
, i
) &&
1496 ext2fs_block_bitmap_loc(fs
, i
))
1499 retval
= ext2fs_allocate_group_table(fs
, i
,
1500 rfs
->reserve_blocks
);
1505 * For those structures that have changed, we need to
1508 if (ext2fs_block_bitmap_loc(old_fs
, i
) !=
1509 (blk
= ext2fs_block_bitmap_loc(fs
, i
))) {
1510 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1511 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1512 !ext2fs_test_block_bitmap2(meta_bmap
, blk
))
1513 ext2fs_mark_block_bitmap2(rfs
->move_blocks
,
1516 if (ext2fs_inode_bitmap_loc(old_fs
, i
) !=
1517 (blk
= ext2fs_inode_bitmap_loc(fs
, i
))) {
1518 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1519 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1520 !ext2fs_test_block_bitmap2(meta_bmap
, blk
))
1521 ext2fs_mark_block_bitmap2(rfs
->move_blocks
,
1526 * The inode table, if we need to relocate it, is
1527 * handled specially. We have to reserve the blocks
1528 * for both the old and the new inode table, since we
1529 * can't have the inode table be destroyed during the
1530 * block relocation phase.
1532 if (ext2fs_inode_table_loc(fs
, i
) == ext2fs_inode_table_loc(old_fs
, i
))
1533 continue; /* inode table not moved */
1535 rfs
->needed_blocks
+= fs
->inode_blocks_per_group
;
1538 * Mark the new inode table as in use in the new block
1539 * allocation bitmap, and move any blocks that might
1542 for (blk
= ext2fs_inode_table_loc(fs
, i
), j
=0;
1543 j
< fs
->inode_blocks_per_group
; j
++, blk
++) {
1544 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1545 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1546 !ext2fs_test_block_bitmap2(meta_bmap
, blk
))
1547 ext2fs_mark_block_bitmap2(rfs
->move_blocks
,
1552 * Make sure the old inode table is reserved in the
1553 * block reservation bitmap.
1555 for (blk
= ext2fs_inode_table_loc(rfs
->old_fs
, i
), j
=0;
1556 j
< fs
->inode_blocks_per_group
; j
++, blk
++)
1557 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
1563 ext2fs_free_block_bitmap(new_meta_bmap
);
1565 ext2fs_free_block_bitmap(meta_bmap
);
1571 * This helper function tries to allocate a new block. We try to
1572 * avoid hitting the original group descriptor blocks at least at
1573 * first, since we want to make it possible to recover from a badly
1574 * aborted resize operation as much as possible.
1576 * In the future, I may further modify this routine to balance out
1577 * where we get the new blocks across the various block groups.
1578 * Ideally we would allocate blocks that corresponded with the block
1579 * group of the containing inode, and keep contiguous blocks
1580 * together. However, this very difficult to do efficiently, since we
1581 * don't have the necessary information up front.
1585 #define DESPERATION 2
1587 static void init_block_alloc(ext2_resize_t rfs
)
1589 rfs
->alloc_state
= AVOID_OLD
;
1590 rfs
->new_blk
= rfs
->new_fs
->super
->s_first_data_block
;
1592 /* HACK for testing */
1593 if (ext2fs_blocks_count(rfs
->new_fs
->super
) >
1594 ext2fs_blocks_count(rfs
->old_fs
->super
))
1595 rfs
->new_blk
= ext2fs_blocks_count(rfs
->old_fs
->super
);
1599 static blk64_t
get_new_block(ext2_resize_t rfs
)
1601 ext2_filsys fs
= rfs
->new_fs
;
1604 if (rfs
->new_blk
>= ext2fs_blocks_count(fs
->super
)) {
1605 if (rfs
->alloc_state
== DESPERATION
)
1608 #ifdef RESIZE2FS_DEBUG
1609 if (rfs
->flags
& RESIZE_DEBUG_BMOVE
)
1610 printf("Going into desperation mode "
1611 "for block allocations\n");
1613 rfs
->alloc_state
= DESPERATION
;
1614 rfs
->new_blk
= fs
->super
->s_first_data_block
;
1617 if (ext2fs_test_block_bitmap2(fs
->block_map
, rfs
->new_blk
) ||
1618 ext2fs_test_block_bitmap2(rfs
->reserve_blocks
,
1620 ((rfs
->alloc_state
== AVOID_OLD
) &&
1621 (rfs
->new_blk
< ext2fs_blocks_count(rfs
->old_fs
->super
)) &&
1622 ext2fs_test_block_bitmap2(rfs
->old_fs
->block_map
,
1627 return rfs
->new_blk
;
1631 static errcode_t
resize2fs_get_alloc_block(ext2_filsys fs
,
1632 blk64_t goal
EXT2FS_ATTR((unused
)),
1635 ext2_resize_t rfs
= (ext2_resize_t
) fs
->priv_data
;
1639 blk
= get_new_block(rfs
);
1643 #ifdef RESIZE2FS_DEBUG
1644 if (rfs
->flags
& 0xF)
1645 printf("get_alloc_block allocating %llu\n", blk
);
1648 ext2fs_mark_block_bitmap2(rfs
->old_fs
->block_map
, blk
);
1649 ext2fs_mark_block_bitmap2(rfs
->new_fs
->block_map
, blk
);
1651 group
= ext2fs_group_of_blk2(rfs
->old_fs
, blk
);
1652 ext2fs_clear_block_uninit(rfs
->old_fs
, group
);
1653 group
= ext2fs_group_of_blk2(rfs
->new_fs
, blk
);
1654 ext2fs_clear_block_uninit(rfs
->new_fs
, group
);
1656 *ret
= (blk64_t
) blk
;
1660 static errcode_t
block_mover(ext2_resize_t rfs
)
1662 blk64_t blk
, old_blk
, new_blk
;
1663 ext2_filsys fs
= rfs
->new_fs
;
1664 ext2_filsys old_fs
= rfs
->old_fs
;
1668 ext2_badblocks_list badblock_list
= 0;
1669 int bb_modified
= 0;
1671 fs
->get_alloc_block
= resize2fs_get_alloc_block
;
1672 old_fs
->get_alloc_block
= resize2fs_get_alloc_block
;
1674 retval
= ext2fs_read_bb_inode(old_fs
, &badblock_list
);
1678 new_blk
= fs
->super
->s_first_data_block
;
1679 if (!rfs
->itable_buf
) {
1680 retval
= ext2fs_get_array(fs
->blocksize
,
1681 fs
->inode_blocks_per_group
,
1686 retval
= ext2fs_create_extent_table(&rfs
->bmap
, 0);
1691 * The first step is to figure out where all of the blocks
1694 to_move
= moved
= 0;
1695 init_block_alloc(rfs
);
1696 for (blk
= B2C(old_fs
->super
->s_first_data_block
);
1697 blk
< ext2fs_blocks_count(old_fs
->super
);
1698 blk
+= EXT2FS_CLUSTER_RATIO(fs
)) {
1699 if (!ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
))
1701 if (!ext2fs_test_block_bitmap2(rfs
->move_blocks
, blk
))
1703 if (ext2fs_badblocks_list_test(badblock_list
, blk
)) {
1704 ext2fs_badblocks_list_del(badblock_list
, blk
);
1709 new_blk
= get_new_block(rfs
);
1714 ext2fs_block_alloc_stats2(fs
, new_blk
, +1);
1715 ext2fs_add_extent_entry(rfs
->bmap
, B2C(blk
), B2C(new_blk
));
1721 ext2fs_free_extent_table(rfs
->bmap
);
1729 * Step two is to actually move the blocks
1731 retval
= ext2fs_iterate_extent(rfs
->bmap
, 0, 0, 0);
1732 if (retval
) goto errout
;
1734 if (rfs
->progress
) {
1735 retval
= (rfs
->progress
)(rfs
, E2_RSZ_BLOCK_RELOC_PASS
,
1741 retval
= ext2fs_iterate_extent(rfs
->bmap
, &old_blk
, &new_blk
, &size
);
1742 if (retval
) goto errout
;
1745 old_blk
= C2B(old_blk
);
1746 new_blk
= C2B(new_blk
);
1748 #ifdef RESIZE2FS_DEBUG
1749 if (rfs
->flags
& RESIZE_DEBUG_BMOVE
)
1750 printf("Moving %llu blocks %llu->%llu\n",
1751 size
, old_blk
, new_blk
);
1755 if (c
> fs
->inode_blocks_per_group
)
1756 c
= fs
->inode_blocks_per_group
;
1757 retval
= io_channel_read_blk64(fs
->io
, old_blk
, c
,
1759 if (retval
) goto errout
;
1760 retval
= io_channel_write_blk64(fs
->io
, new_blk
, c
,
1762 if (retval
) goto errout
;
1767 if (rfs
->progress
) {
1768 io_channel_flush(fs
->io
);
1769 retval
= (rfs
->progress
)(rfs
,
1770 E2_RSZ_BLOCK_RELOC_PASS
,
1776 io_channel_flush(fs
->io
);
1780 if (badblock_list
) {
1781 if (!retval
&& bb_modified
)
1782 retval
= ext2fs_update_bb_inode(old_fs
,
1784 ext2fs_badblocks_list_free(badblock_list
);
1790 /* --------------------------------------------------------------------
1792 * Resize processing, phase 3
1794 * --------------------------------------------------------------------
1799 * The extent translation table is stored in clusters so we need to
1800 * take special care when mapping a source block number to its
1801 * destination block number.
1803 static __u64
extent_translate(ext2_filsys fs
, ext2_extent extent
, __u64 old_loc
)
1805 __u64 new_block
= C2B(ext2fs_extent_translate(extent
, B2C(old_loc
)));
1808 new_block
+= old_loc
& (EXT2FS_CLUSTER_RATIO(fs
) - 1);
1812 struct process_block_struct
{
1816 struct ext2_inode
* inode
;
1823 static int process_block(ext2_filsys fs
, blk64_t
*block_nr
,
1824 e2_blkcnt_t blockcnt
,
1825 blk64_t ref_block
EXT2FS_ATTR((unused
)),
1826 int ref_offset
EXT2FS_ATTR((unused
)), void *priv_data
)
1828 struct process_block_struct
*pb
;
1830 blk64_t block
, new_block
;
1833 pb
= (struct process_block_struct
*) priv_data
;
1835 if (pb
->rfs
->bmap
) {
1836 new_block
= extent_translate(fs
, pb
->rfs
->bmap
, block
);
1838 *block_nr
= new_block
;
1839 ret
|= BLOCK_CHANGED
;
1841 #ifdef RESIZE2FS_DEBUG
1842 if (pb
->rfs
->flags
& RESIZE_DEBUG_BMOVE
)
1843 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1844 pb
->old_ino
, blockcnt
, block
,
1852 retval
= ext2fs_add_dir_block2(fs
->dblist
, pb
->ino
,
1853 block
, (int) blockcnt
);
1865 static errcode_t
progress_callback(ext2_filsys fs
,
1866 ext2_inode_scan scan
EXT2FS_ATTR((unused
)),
1867 dgrp_t group
, void * priv_data
)
1869 ext2_resize_t rfs
= (ext2_resize_t
) priv_data
;
1873 * This check is to protect against old ext2 libraries. It
1874 * shouldn't be needed against new libraries.
1879 if (rfs
->progress
) {
1880 io_channel_flush(fs
->io
);
1881 retval
= (rfs
->progress
)(rfs
, E2_RSZ_INODE_SCAN_PASS
,
1882 group
+1, fs
->group_desc_count
);
1890 static errcode_t
migrate_ea_block(ext2_resize_t rfs
, ext2_ino_t ino
,
1891 struct ext2_inode
*inode
, int *changed
)
1897 /* No EA block or no remapping? Quit early. */
1898 if (ext2fs_file_acl_block(rfs
->old_fs
, inode
) == 0 || !rfs
->bmap
)
1900 new_block
= extent_translate(rfs
->old_fs
, rfs
->bmap
,
1901 ext2fs_file_acl_block(rfs
->old_fs
, inode
));
1905 /* Set the new ACL block */
1906 ext2fs_file_acl_block_set(rfs
->old_fs
, inode
, new_block
);
1908 /* Update checksum */
1909 if (ext2fs_has_feature_metadata_csum(rfs
->new_fs
->super
)) {
1910 err
= ext2fs_get_mem(rfs
->old_fs
->blocksize
, &buf
);
1913 rfs
->old_fs
->flags
|= EXT2_FLAG_IGNORE_CSUM_ERRORS
;
1914 err
= ext2fs_read_ext_attr3(rfs
->old_fs
, new_block
, buf
, ino
);
1915 rfs
->old_fs
->flags
&= ~EXT2_FLAG_IGNORE_CSUM_ERRORS
;
1918 err
= ext2fs_write_ext_attr3(rfs
->old_fs
, new_block
, buf
, ino
);
1925 ext2fs_free_mem(&buf
);
1929 /* Rewrite extents */
1930 static errcode_t
rewrite_extents(ext2_filsys fs
, ext2_ino_t ino
)
1932 ext2_extent_handle_t handle
;
1933 struct ext2fs_extent extent
;
1935 struct ext2_extent_info info
;
1937 errcode
= ext2fs_extent_open(fs
, ino
, &handle
);
1941 errcode
= ext2fs_extent_get(handle
, EXT2_EXTENT_ROOT
, &extent
);
1946 errcode
= ext2fs_extent_get_info(handle
, &info
);
1951 * If this is the first extent in an extent block that we
1952 * haven't visited, rewrite the extent to force the ETB
1953 * checksum to be rewritten.
1955 if (info
.curr_entry
== 1 && info
.curr_level
!= 0 &&
1956 !(extent
.e_flags
& EXT2_EXTENT_FLAGS_SECOND_VISIT
)) {
1957 errcode
= ext2fs_extent_replace(handle
, 0, &extent
);
1962 /* Skip to the end of a block of leaf nodes */
1963 if (extent
.e_flags
& EXT2_EXTENT_FLAGS_LEAF
) {
1964 errcode
= ext2fs_extent_get(handle
,
1965 EXT2_EXTENT_LAST_SIB
,
1971 errcode
= ext2fs_extent_get(handle
, EXT2_EXTENT_NEXT
, &extent
);
1972 } while (errcode
== 0);
1975 /* Ok if we run off the end */
1976 if (errcode
== EXT2_ET_EXTENT_NO_NEXT
)
1978 ext2fs_extent_free(handle
);
1982 static void quiet_com_err_proc(const char *whoami
EXT2FS_ATTR((unused
)),
1983 errcode_t code
EXT2FS_ATTR((unused
)),
1984 const char *fmt
EXT2FS_ATTR((unused
)),
1985 va_list args
EXT2FS_ATTR((unused
)))
1989 static errcode_t
inode_scan_and_fix(ext2_resize_t rfs
)
1991 struct process_block_struct pb
;
1992 ext2_ino_t ino
, new_inode
;
1993 struct ext2_inode
*inode
= NULL
;
1994 ext2_inode_scan scan
= NULL
;
1996 char *block_buf
= 0;
1997 ext2_ino_t start_to_move
;
2000 if ((rfs
->old_fs
->group_desc_count
<=
2001 rfs
->new_fs
->group_desc_count
) &&
2005 set_com_err_hook(quiet_com_err_proc
);
2007 retval
= ext2fs_open_inode_scan(rfs
->old_fs
, 0, &scan
);
2008 if (retval
) goto errout
;
2010 retval
= ext2fs_init_dblist(rfs
->old_fs
, 0);
2011 if (retval
) goto errout
;
2012 retval
= ext2fs_get_array(rfs
->old_fs
->blocksize
, 3, &block_buf
);
2013 if (retval
) goto errout
;
2015 start_to_move
= (rfs
->new_fs
->group_desc_count
*
2016 rfs
->new_fs
->super
->s_inodes_per_group
);
2018 if (rfs
->progress
) {
2019 retval
= (rfs
->progress
)(rfs
, E2_RSZ_INODE_SCAN_PASS
,
2020 0, rfs
->old_fs
->group_desc_count
);
2024 ext2fs_set_inode_callback(scan
, progress_callback
, (void *) rfs
);
2028 new_inode
= EXT2_FIRST_INODE(rfs
->new_fs
->super
);
2029 inode_size
= EXT2_INODE_SIZE(rfs
->new_fs
->super
);
2030 inode
= malloc(inode_size
);
2036 * First, copy all of the inodes that need to be moved
2037 * elsewhere in the inode table
2040 retval
= ext2fs_get_next_inode_full(scan
, &ino
, inode
, inode_size
);
2041 if (retval
) goto errout
;
2045 if (inode
->i_links_count
== 0 && ino
!= EXT2_RESIZE_INO
)
2046 continue; /* inode not in use */
2048 pb
.is_dir
= LINUX_S_ISDIR(inode
->i_mode
);
2051 /* Remap EA block */
2052 retval
= migrate_ea_block(rfs
, ino
, inode
, &pb
.changed
);
2057 if (ino
<= start_to_move
)
2058 goto remap_blocks
; /* Don't need to move inode. */
2061 * Find a new inode. Now that extents and directory blocks
2062 * are tied to the inode number through the checksum, we must
2063 * set up the new inode before we start rewriting blocks.
2065 retval
= ext2fs_new_inode(rfs
->new_fs
, 0, 0, 0, &new_inode
);
2069 ext2fs_inode_alloc_stats2(rfs
->new_fs
, new_inode
, +1,
2071 inode
->i_ctime
= time(0);
2072 retval
= ext2fs_write_inode_full(rfs
->old_fs
, new_inode
,
2078 #ifdef RESIZE2FS_DEBUG
2079 if (rfs
->flags
& RESIZE_DEBUG_INODEMAP
)
2080 printf("Inode moved %u->%u\n", ino
, new_inode
);
2083 retval
= ext2fs_create_extent_table(&rfs
->imap
, 0);
2087 ext2fs_add_extent_entry(rfs
->imap
, ino
, new_inode
);
2091 retval
= ext2fs_write_inode_full(rfs
->old_fs
,
2097 /* Rewrite extent block checksums with new inode number */
2098 if (ext2fs_has_feature_metadata_csum(rfs
->old_fs
->super
) &&
2099 (inode
->i_flags
& EXT4_EXTENTS_FL
)) {
2100 rfs
->old_fs
->flags
|= EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2101 retval
= rewrite_extents(rfs
->old_fs
, new_inode
);
2102 rfs
->old_fs
->flags
&= ~EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2108 * Update inodes to point to new blocks; schedule directory
2109 * blocks for inode remapping. Need to write out dir blocks
2110 * with new inode numbers if we have metadata_csum enabled.
2112 if (ext2fs_inode_has_valid_blocks2(rfs
->old_fs
, inode
) &&
2113 (rfs
->bmap
|| pb
.is_dir
)) {
2116 pb
.has_extents
= inode
->i_flags
& EXT4_EXTENTS_FL
;
2117 rfs
->old_fs
->flags
|= EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2118 retval
= ext2fs_block_iterate3(rfs
->old_fs
,
2119 new_inode
, 0, block_buf
,
2120 process_block
, &pb
);
2121 rfs
->old_fs
->flags
&= ~EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2128 } else if ((inode
->i_flags
& EXT4_INLINE_DATA_FL
) &&
2129 (rfs
->bmap
|| pb
.is_dir
)) {
2130 /* inline data dir; update it too */
2131 retval
= ext2fs_add_dir_block2(rfs
->old_fs
->dblist
,
2137 io_channel_flush(rfs
->old_fs
->io
);
2140 reset_com_err_hook();
2142 ext2fs_free_extent_table(rfs
->bmap
);
2146 ext2fs_close_inode_scan(scan
);
2148 ext2fs_free_mem(&block_buf
);
2153 /* --------------------------------------------------------------------
2155 * Resize processing, phase 4.
2157 * --------------------------------------------------------------------
2163 unsigned int max_dirs
;
2167 static int check_and_change_inodes(ext2_ino_t dir
,
2168 int entry
EXT2FS_ATTR((unused
)),
2169 struct ext2_dir_entry
*dirent
, int offset
,
2170 int blocksize
EXT2FS_ATTR((unused
)),
2171 char *buf
EXT2FS_ATTR((unused
)),
2174 struct istruct
*is
= (struct istruct
*) priv_data
;
2175 struct ext2_inode inode
;
2176 ext2_ino_t new_inode
;
2180 if (is
->rfs
->progress
&& offset
== 0) {
2181 io_channel_flush(is
->rfs
->old_fs
->io
);
2182 is
->err
= (is
->rfs
->progress
)(is
->rfs
,
2183 E2_RSZ_INODE_REF_UPD_PASS
,
2184 ++is
->num
, is
->max_dirs
);
2186 return DIRENT_ABORT
;
2190 * If we have checksums enabled and the inode wasn't present in the
2191 * old fs, then we must rewrite all dir blocks with new checksums.
2193 if (ext2fs_has_feature_metadata_csum(is
->rfs
->old_fs
->super
) &&
2194 !ext2fs_test_inode_bitmap2(is
->rfs
->old_fs
->inode_map
, dir
))
2195 ret
|= DIRENT_CHANGED
;
2200 new_inode
= ext2fs_extent_translate(is
->rfs
->imap
, dirent
->inode
);
2204 #ifdef RESIZE2FS_DEBUG
2205 if (is
->rfs
->flags
& RESIZE_DEBUG_INODEMAP
)
2206 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2207 dir
, ext2fs_dirent_name_len(dirent
), dirent
->name
,
2208 dirent
->inode
, new_inode
);
2211 dirent
->inode
= new_inode
;
2213 /* Update the directory mtime and ctime */
2214 retval
= ext2fs_read_inode(is
->rfs
->old_fs
, dir
, &inode
);
2216 inode
.i_mtime
= inode
.i_ctime
= time(0);
2217 is
->err
= ext2fs_write_inode(is
->rfs
->old_fs
, dir
, &inode
);
2219 return ret
| DIRENT_ABORT
;
2222 return ret
| DIRENT_CHANGED
;
2225 static errcode_t
inode_ref_fix(ext2_resize_t rfs
)
2234 * Now, we iterate over all of the directories to update the
2238 is
.max_dirs
= ext2fs_dblist_count2(rfs
->old_fs
->dblist
);
2242 if (rfs
->progress
) {
2243 retval
= (rfs
->progress
)(rfs
, E2_RSZ_INODE_REF_UPD_PASS
,
2249 rfs
->old_fs
->flags
|= EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2250 retval
= ext2fs_dblist_dir_iterate(rfs
->old_fs
->dblist
,
2251 DIRENT_FLAG_INCLUDE_EMPTY
, 0,
2252 check_and_change_inodes
, &is
);
2253 rfs
->old_fs
->flags
&= ~EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2261 if (rfs
->progress
&& (is
.num
< is
.max_dirs
))
2262 (rfs
->progress
)(rfs
, E2_RSZ_INODE_REF_UPD_PASS
,
2263 is
.max_dirs
, is
.max_dirs
);
2266 ext2fs_free_extent_table(rfs
->imap
);
2272 /* --------------------------------------------------------------------
2274 * Resize processing, phase 5.
2276 * In this phase we actually move the inode table around, and then
2277 * update the summary statistics. This is scary, since aborting here
2278 * will potentially scramble the filesystem. (We are moving the
2279 * inode tables around in place, and so the potential for lost data,
2280 * or at the very least scrambling the mapping between filenames and
2281 * inode numbers is very high in case of a power failure here.)
2282 * --------------------------------------------------------------------
2287 * A very scary routine --- this one moves the inode table around!!!
2289 * After this you have to use the rfs->new_fs file handle to read and
2292 static errcode_t
move_itables(ext2_resize_t rfs
)
2296 dgrp_t i
, max_groups
;
2297 ext2_filsys fs
= rfs
->new_fs
;
2299 blk64_t old_blk
, new_blk
, blk
, cluster_freed
;
2303 ext2fs_block_bitmap new_bmap
= NULL
;
2305 max_groups
= fs
->group_desc_count
;
2306 if (max_groups
> rfs
->old_fs
->group_desc_count
)
2307 max_groups
= rfs
->old_fs
->group_desc_count
;
2309 size
= fs
->blocksize
* fs
->inode_blocks_per_group
;
2310 if (!rfs
->itable_buf
) {
2311 retval
= ext2fs_get_mem(size
, &rfs
->itable_buf
);
2316 if (EXT2FS_CLUSTER_RATIO(fs
) > 1) {
2317 retval
= ext2fs_allocate_block_bitmap(fs
, _("new meta blocks"),
2322 retval
= mark_table_blocks(fs
, new_bmap
);
2328 * Figure out how many inode tables we need to move
2330 to_move
= moved
= 0;
2331 for (i
=0; i
< max_groups
; i
++)
2332 if (ext2fs_inode_table_loc(rfs
->old_fs
, i
) !=
2333 ext2fs_inode_table_loc(fs
, i
))
2341 if (rfs
->progress
) {
2342 retval
= rfs
->progress(rfs
, E2_RSZ_MOVE_ITABLE_PASS
,
2348 rfs
->old_fs
->flags
|= EXT2_FLAG_MASTER_SB_ONLY
;
2350 for (i
=0; i
< max_groups
; i
++) {
2351 old_blk
= ext2fs_inode_table_loc(rfs
->old_fs
, i
);
2352 new_blk
= ext2fs_inode_table_loc(fs
, i
);
2353 diff
= new_blk
- old_blk
;
2355 #ifdef RESIZE2FS_DEBUG
2356 if (rfs
->flags
& RESIZE_DEBUG_ITABLEMOVE
)
2357 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2358 i
, old_blk
, new_blk
, diff
);
2366 retval
= io_channel_read_blk64(fs
->io
, old_blk
,
2367 fs
->inode_blocks_per_group
,
2372 * The end of the inode table segment often contains
2373 * all zeros, and we're often only moving the inode
2374 * table down a block or two. If so, we can optimize
2375 * things by not rewriting blocks that we know to be zero
2378 for (cp
= rfs
->itable_buf
+size
-1, n
=0; n
< size
; n
++, cp
--)
2381 n
= n
>> EXT2_BLOCK_SIZE_BITS(fs
->super
);
2382 #ifdef RESIZE2FS_DEBUG
2383 if (rfs
->flags
& RESIZE_DEBUG_ITABLEMOVE
)
2384 printf("%d blocks of zeros...\n", n
);
2386 num
= fs
->inode_blocks_per_group
;
2390 retval
= io_channel_write_blk64(fs
->io
, new_blk
,
2391 num
, rfs
->itable_buf
);
2393 io_channel_write_blk64(fs
->io
, old_blk
,
2394 num
, rfs
->itable_buf
);
2398 retval
= io_channel_write_blk64(fs
->io
,
2399 old_blk
+ fs
->inode_blocks_per_group
,
2400 diff
, (rfs
->itable_buf
+
2401 (fs
->inode_blocks_per_group
- diff
) *
2407 for (blk
= ext2fs_inode_table_loc(rfs
->old_fs
, i
), j
=0;
2408 j
< fs
->inode_blocks_per_group
;) {
2409 if (new_bmap
== NULL
||
2410 !ext2fs_test_block_bitmap2(new_bmap
, blk
)) {
2411 ext2fs_block_alloc_stats2(fs
, blk
, -1);
2412 cluster_freed
= EXT2FS_CLUSTER_RATIO(fs
) -
2413 (blk
& EXT2FS_CLUSTER_MASK(fs
));
2414 blk
+= cluster_freed
;
2422 ext2fs_inode_table_loc_set(rfs
->old_fs
, i
, new_blk
);
2423 ext2fs_group_desc_csum_set(rfs
->old_fs
, i
);
2424 ext2fs_mark_super_dirty(rfs
->old_fs
);
2425 ext2fs_flush(rfs
->old_fs
);
2427 if (rfs
->progress
) {
2428 retval
= rfs
->progress(rfs
, E2_RSZ_MOVE_ITABLE_PASS
,
2434 mark_table_blocks(fs
, fs
->block_map
);
2436 #ifdef RESIZE2FS_DEBUG
2437 if (rfs
->flags
& RESIZE_DEBUG_ITABLEMOVE
)
2438 printf("Inode table move finished.\n");
2444 ext2fs_free_block_bitmap(new_bmap
);
2449 * This function is used when expanding a file system. It frees the
2450 * superblock and block group descriptor blocks from the block group
2451 * which is no longer the last block group.
2453 static errcode_t
clear_sparse_super2_last_group(ext2_resize_t rfs
)
2455 ext2_filsys fs
= rfs
->new_fs
;
2456 ext2_filsys old_fs
= rfs
->old_fs
;
2458 dgrp_t old_last_bg
= rfs
->old_fs
->group_desc_count
- 1;
2459 dgrp_t last_bg
= fs
->group_desc_count
- 1;
2460 blk64_t sb
, old_desc
;
2463 if (!ext2fs_has_feature_sparse_super2(fs
->super
))
2466 if (last_bg
<= old_last_bg
)
2469 if (fs
->super
->s_backup_bgs
[0] == old_fs
->super
->s_backup_bgs
[0] &&
2470 fs
->super
->s_backup_bgs
[1] == old_fs
->super
->s_backup_bgs
[1])
2473 if (old_fs
->super
->s_backup_bgs
[0] != old_last_bg
&&
2474 old_fs
->super
->s_backup_bgs
[1] != old_last_bg
)
2477 if (fs
->super
->s_backup_bgs
[0] == old_last_bg
||
2478 fs
->super
->s_backup_bgs
[1] == old_last_bg
)
2481 if (old_last_bg
== 0)
2484 retval
= ext2fs_super_and_bgd_loc2(rfs
->old_fs
, old_last_bg
,
2485 &sb
, &old_desc
, NULL
, &num
);
2490 ext2fs_unmark_block_bitmap2(fs
->block_map
, sb
);
2492 ext2fs_unmark_block_bitmap_range2(fs
->block_map
, old_desc
, num
);
2497 * This function is used when shrinking a file system. We need to
2498 * utilize blocks from what will be the new last block group for the
2499 * backup superblock and block group descriptor blocks.
2500 * Unfortunately, those blocks may be used by other files or fs
2501 * metadata blocks. We need to mark them as being in use.
2503 static errcode_t
reserve_sparse_super2_last_group(ext2_resize_t rfs
,
2504 ext2fs_block_bitmap meta_bmap
)
2506 ext2_filsys fs
= rfs
->new_fs
;
2507 ext2_filsys old_fs
= rfs
->old_fs
;
2509 dgrp_t old_last_bg
= rfs
->old_fs
->group_desc_count
- 1;
2510 dgrp_t last_bg
= fs
->group_desc_count
- 1;
2512 blk64_t blk
, sb
, old_desc
;
2516 if (!ext2fs_has_feature_sparse_super2(fs
->super
))
2519 if (last_bg
>= old_last_bg
)
2522 if (fs
->super
->s_backup_bgs
[0] == old_fs
->super
->s_backup_bgs
[0] &&
2523 fs
->super
->s_backup_bgs
[1] == old_fs
->super
->s_backup_bgs
[1])
2526 if (fs
->super
->s_backup_bgs
[0] != last_bg
&&
2527 fs
->super
->s_backup_bgs
[1] != last_bg
)
2530 if (old_fs
->super
->s_backup_bgs
[0] == last_bg
||
2531 old_fs
->super
->s_backup_bgs
[1] == last_bg
)
2534 retval
= ext2fs_super_and_bgd_loc2(rfs
->new_fs
, last_bg
,
2535 &sb
, &old_desc
, NULL
, &num
);
2539 if (last_bg
&& !sb
) {
2540 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2544 if (old_desc
&& old_desc
!= sb
+1) {
2545 fputs(_("Should never happen! Unexpected old_desc in "
2546 "super_sparse bg?\n"),
2550 num
= (old_desc
) ? num
: 1;
2552 /* Reserve the backup blocks */
2553 ext2fs_mark_block_bitmap_range2(fs
->block_map
, sb
, num
);
2555 for (g
= 0; g
< fs
->group_desc_count
; g
++) {
2558 mb
= ext2fs_block_bitmap_loc(fs
, g
);
2559 if ((mb
>= sb
) && (mb
< sb
+ num
)) {
2560 ext2fs_block_bitmap_loc_set(fs
, g
, 0);
2563 mb
= ext2fs_inode_bitmap_loc(fs
, g
);
2564 if ((mb
>= sb
) && (mb
< sb
+ num
)) {
2565 ext2fs_inode_bitmap_loc_set(fs
, g
, 0);
2568 mb
= ext2fs_inode_table_loc(fs
, g
);
2569 if ((mb
< sb
+ num
) &&
2570 (sb
< mb
+ fs
->inode_blocks_per_group
)) {
2571 ext2fs_inode_table_loc_set(fs
, g
, 0);
2575 retval
= ext2fs_allocate_group_table(fs
, g
, 0);
2581 for (blk
= sb
, i
= 0; i
< num
; blk
++, i
++) {
2582 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
2583 !ext2fs_test_block_bitmap2(meta_bmap
, blk
)) {
2584 ext2fs_mark_block_bitmap2(rfs
->move_blocks
, blk
);
2585 rfs
->needed_blocks
++;
2587 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
2593 * Fix the resize inode
2595 static errcode_t
fix_resize_inode(ext2_filsys fs
)
2597 struct ext2_inode inode
;
2600 if (!ext2fs_has_feature_resize_inode(fs
->super
))
2603 retval
= ext2fs_read_inode(fs
, EXT2_RESIZE_INO
, &inode
);
2604 if (retval
) goto errout
;
2606 ext2fs_iblk_set(fs
, &inode
, 1);
2608 retval
= ext2fs_write_inode(fs
, EXT2_RESIZE_INO
, &inode
);
2609 if (retval
) goto errout
;
2611 if (!inode
.i_block
[EXT2_DIND_BLOCK
]) {
2613 * Avoid zeroing out block #0; that's rude. This
2614 * should never happen anyway since the filesystem
2615 * should be fsck'ed and we assume it is consistent.
2617 fprintf(stderr
, "%s",
2618 _("Should never happen: resize inode corrupt!\n"));
2622 retval
= ext2fs_zero_blocks2(fs
, inode
.i_block
[EXT2_DIND_BLOCK
], 1,
2627 retval
= ext2fs_create_resize_inode(fs
);
2636 * Finally, recalculate the summary information
2638 static errcode_t
ext2fs_calculate_summary_stats(ext2_filsys fs
)
2642 unsigned int group
= 0;
2643 unsigned int count
= 0;
2644 blk64_t total_blocks_free
= 0;
2645 int total_inodes_free
= 0;
2648 blk64_t super_blk
, old_desc_blk
, new_desc_blk
;
2649 int old_desc_blocks
;
2652 * First calculate the block statistics
2654 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_BLOCK_UNINIT
);
2655 ext2fs_super_and_bgd_loc2(fs
, group
, &super_blk
, &old_desc_blk
,
2657 if (ext2fs_has_feature_meta_bg(fs
->super
))
2658 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
2660 old_desc_blocks
= fs
->desc_blocks
+
2661 fs
->super
->s_reserved_gdt_blocks
;
2662 for (blk
= B2C(fs
->super
->s_first_data_block
);
2663 blk
< ext2fs_blocks_count(fs
->super
);
2664 blk
+= EXT2FS_CLUSTER_RATIO(fs
)) {
2666 !(EQ_CLSTR(blk
, super_blk
) ||
2667 ((old_desc_blk
&& old_desc_blocks
&&
2668 GE_CLSTR(blk
, old_desc_blk
) &&
2669 LT_CLSTR(blk
, old_desc_blk
+ old_desc_blocks
))) ||
2670 ((new_desc_blk
&& EQ_CLSTR(blk
, new_desc_blk
))) ||
2671 EQ_CLSTR(blk
, ext2fs_block_bitmap_loc(fs
, group
)) ||
2672 EQ_CLSTR(blk
, ext2fs_inode_bitmap_loc(fs
, group
)) ||
2673 ((GE_CLSTR(blk
, ext2fs_inode_table_loc(fs
, group
)) &&
2674 LT_CLSTR(blk
, ext2fs_inode_table_loc(fs
, group
)
2675 + fs
->inode_blocks_per_group
))))) ||
2676 (!ext2fs_fast_test_block_bitmap2(fs
->block_map
, blk
))) {
2678 total_blocks_free
++;
2681 if ((count
== fs
->super
->s_clusters_per_group
) ||
2682 EQ_CLSTR(blk
, ext2fs_blocks_count(fs
->super
)-1)) {
2683 ext2fs_bg_free_blocks_count_set(fs
, group
, group_free
);
2684 ext2fs_group_desc_csum_set(fs
, group
);
2686 if (group
>= fs
->group_desc_count
)
2690 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_BLOCK_UNINIT
);
2691 ext2fs_super_and_bgd_loc2(fs
, group
, &super_blk
,
2694 if (ext2fs_has_feature_meta_bg(fs
->super
))
2695 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
2697 old_desc_blocks
= fs
->desc_blocks
+
2698 fs
->super
->s_reserved_gdt_blocks
;
2701 total_blocks_free
= C2B(total_blocks_free
);
2702 ext2fs_free_blocks_count_set(fs
->super
, total_blocks_free
);
2705 * Next, calculate the inode statistics
2711 /* Protect loop from wrap-around if s_inodes_count maxed */
2712 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_INODE_UNINIT
);
2713 for (ino
= 1; ino
<= fs
->super
->s_inodes_count
&& ino
> 0; ino
++) {
2715 !ext2fs_fast_test_inode_bitmap2(fs
->inode_map
, ino
)) {
2717 total_inodes_free
++;
2720 if ((count
== fs
->super
->s_inodes_per_group
) ||
2721 (ino
== fs
->super
->s_inodes_count
)) {
2722 ext2fs_bg_free_inodes_count_set(fs
, group
, group_free
);
2723 ext2fs_group_desc_csum_set(fs
, group
);
2725 if (group
>= fs
->group_desc_count
)
2729 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_INODE_UNINIT
);
2732 fs
->super
->s_free_inodes_count
= total_inodes_free
;
2733 ext2fs_mark_super_dirty(fs
);
2738 * Journal may have been relocated; update the backup journal blocks
2739 * in the superblock.
2741 static errcode_t
fix_sb_journal_backup(ext2_filsys fs
)
2744 struct ext2_inode inode
;
2746 if (!ext2fs_has_feature_journal(fs
->super
))
2749 /* External journal? Nothing to do. */
2750 if (fs
->super
->s_journal_dev
&& !fs
->super
->s_journal_inum
)
2753 retval
= ext2fs_read_inode(fs
, fs
->super
->s_journal_inum
, &inode
);
2756 memcpy(fs
->super
->s_jnl_blocks
, inode
.i_block
, EXT2_N_BLOCKS
*4);
2757 fs
->super
->s_jnl_blocks
[15] = inode
.i_size_high
;
2758 fs
->super
->s_jnl_blocks
[16] = inode
.i_size
;
2759 fs
->super
->s_jnl_backup_type
= EXT3_JNL_BACKUP_BLOCKS
;
2760 ext2fs_mark_super_dirty(fs
);
2764 static int calc_group_overhead(ext2_filsys fs
, blk64_t grp
,
2765 int old_desc_blocks
)
2767 blk64_t super_blk
, old_desc_blk
, new_desc_blk
;
2770 /* inode table blocks plus allocation bitmaps */
2771 overhead
= fs
->inode_blocks_per_group
+ 2;
2773 ext2fs_super_and_bgd_loc2(fs
, grp
, &super_blk
,
2774 &old_desc_blk
, &new_desc_blk
, 0);
2775 if ((grp
== 0) || super_blk
)
2778 overhead
+= old_desc_blocks
;
2779 else if (new_desc_blk
)
2786 * calcluate the minimum number of blocks the given fs can be resized to
2788 blk64_t
calculate_minimum_resize_size(ext2_filsys fs
, int flags
)
2790 ext2_ino_t inode_count
;
2791 dgrp_t groups
, flex_groups
;
2792 blk64_t blks_needed
, data_blocks
;
2793 blk64_t grp
, data_needed
, last_start
;
2794 blk64_t overhead
= 0;
2795 int old_desc_blocks
;
2796 int flexbg_size
= 1 << fs
->super
->s_log_groups_per_flex
;
2799 * first figure out how many group descriptors we need to
2800 * handle the number of inodes we have
2802 inode_count
= fs
->super
->s_inodes_count
-
2803 fs
->super
->s_free_inodes_count
;
2804 blks_needed
= ext2fs_div_ceil(inode_count
,
2805 fs
->super
->s_inodes_per_group
) *
2806 (blk64_t
) EXT2_BLOCKS_PER_GROUP(fs
->super
);
2807 groups
= ext2fs_div64_ceil(blks_needed
,
2808 EXT2_BLOCKS_PER_GROUP(fs
->super
));
2809 #ifdef RESIZE2FS_DEBUG
2810 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2811 printf("fs has %d inodes, %d groups required.\n",
2812 inode_count
, groups
);
2816 * number of old-style block group descriptor blocks
2818 if (ext2fs_has_feature_meta_bg(fs
->super
))
2819 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
2821 old_desc_blocks
= fs
->desc_blocks
+
2822 fs
->super
->s_reserved_gdt_blocks
;
2824 /* calculate how many blocks are needed for data */
2825 data_needed
= ext2fs_blocks_count(fs
->super
) -
2826 ext2fs_free_blocks_count(fs
->super
);
2828 for (grp
= 0; grp
< fs
->group_desc_count
; grp
++)
2829 data_needed
-= calc_group_overhead(fs
, grp
, old_desc_blocks
);
2830 #ifdef RESIZE2FS_DEBUG
2831 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2832 printf("fs requires %llu data blocks.\n", data_needed
);
2836 * For ext4 we need to allow for up to a flex_bg worth of
2837 * inode tables of slack space so the resize operation can be
2838 * guaranteed to finish.
2840 flex_groups
= groups
;
2841 if (ext2fs_has_feature_flex_bg(fs
->super
)) {
2842 dgrp_t remainder
= groups
& (flexbg_size
- 1);
2844 flex_groups
+= flexbg_size
- remainder
;
2845 if (flex_groups
> fs
->group_desc_count
)
2846 flex_groups
= fs
->group_desc_count
;
2850 * figure out how many data blocks we have given the number of groups
2851 * we need for our inodes
2853 data_blocks
= EXT2_GROUPS_TO_BLOCKS(fs
->super
, groups
);
2855 for (grp
= 0; grp
< flex_groups
; grp
++) {
2856 overhead
= calc_group_overhead(fs
, grp
, old_desc_blocks
);
2859 * we want to keep track of how much data we can store in
2860 * the groups leading up to the last group so we can determine
2861 * how big the last group needs to be
2863 if (grp
< (groups
- 1))
2864 last_start
+= EXT2_BLOCKS_PER_GROUP(fs
->super
) -
2867 if (data_blocks
> overhead
)
2868 data_blocks
-= overhead
;
2872 #ifdef RESIZE2FS_DEBUG
2873 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2874 printf("With %d group(s), we have %llu blocks available.\n",
2875 groups
, data_blocks
);
2879 * if we need more group descriptors in order to accomodate our data
2880 * then we need to add them here
2882 blks_needed
= data_needed
;
2883 while (blks_needed
> data_blocks
) {
2884 blk64_t remainder
= blks_needed
- data_blocks
;
2887 /* figure out how many more groups we need for the data */
2888 extra_grps
= ext2fs_div64_ceil(remainder
,
2889 EXT2_BLOCKS_PER_GROUP(fs
->super
));
2891 data_blocks
+= EXT2_GROUPS_TO_BLOCKS(fs
->super
, extra_grps
);
2893 /* ok we have to account for the last group */
2894 overhead
= calc_group_overhead(fs
, groups
-1, old_desc_blocks
);
2895 last_start
+= EXT2_BLOCKS_PER_GROUP(fs
->super
) - overhead
;
2898 groups
+= extra_grps
;
2899 if (!ext2fs_has_feature_flex_bg(fs
->super
))
2900 flex_groups
= groups
;
2901 else if (groups
> flex_groups
) {
2902 dgrp_t r
= groups
& (flexbg_size
- 1);
2904 flex_groups
= groups
+ flexbg_size
- r
;
2905 if (flex_groups
> fs
->group_desc_count
)
2906 flex_groups
= fs
->group_desc_count
;
2909 for (; grp
< flex_groups
; grp
++) {
2910 overhead
= calc_group_overhead(fs
, grp
,
2914 * again, we need to see how much data we cram into
2915 * all of the groups leading up to the last group
2917 if (grp
< groups
- 1)
2918 last_start
+= EXT2_BLOCKS_PER_GROUP(fs
->super
)
2921 data_blocks
-= overhead
;
2924 #ifdef RESIZE2FS_DEBUG
2925 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2926 printf("Added %d extra group(s), "
2927 "blks_needed %llu, data_blocks %llu, "
2928 "last_start %llu\n", extra_grps
, blks_needed
,
2929 data_blocks
, last_start
);
2933 /* now for the fun voodoo */
2935 if (ext2fs_has_feature_flex_bg(fs
->super
) &&
2936 (grp
& ~(flexbg_size
- 1)) == 0)
2937 grp
= grp
& ~(flexbg_size
- 1);
2939 for (; grp
< flex_groups
; grp
++)
2940 overhead
+= calc_group_overhead(fs
, grp
, old_desc_blocks
);
2942 #ifdef RESIZE2FS_DEBUG
2943 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2944 printf("Last group's overhead is %llu\n", overhead
);
2948 * if this is the case then the last group is going to have data in it
2949 * so we need to adjust the size of the last group accordingly
2951 if (last_start
< blks_needed
) {
2952 blk64_t remainder
= blks_needed
- last_start
;
2954 #ifdef RESIZE2FS_DEBUG
2955 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2956 printf("Need %llu data blocks in last group\n",
2960 * 50 is a magic number that mkfs/resize uses to see if its
2961 * even worth making/resizing the fs. basically you need to
2962 * have at least 50 blocks in addition to the blocks needed
2963 * for the metadata in the last group
2966 overhead
+= remainder
;
2972 overhead
+= fs
->super
->s_first_data_block
;
2973 #ifdef RESIZE2FS_DEBUG
2974 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2975 printf("Final size of last group is %lld\n", overhead
);
2978 /* Add extra slack for bigalloc file systems */
2979 if (EXT2FS_CLUSTER_RATIO(fs
) > 1)
2980 overhead
+= EXT2FS_CLUSTER_RATIO(fs
) * 2;
2983 * since our last group doesn't have to be BLOCKS_PER_GROUP
2984 * large, we only do groups-1, and then add the number of
2985 * blocks needed to handle the group descriptor metadata+data
2988 blks_needed
= EXT2_GROUPS_TO_BLOCKS(fs
->super
, groups
- 1);
2989 blks_needed
+= overhead
;
2992 * Make sure blks_needed covers the end of the inode table in
2993 * the last block group.
2995 overhead
= ext2fs_inode_table_loc(fs
, groups
-1) +
2996 fs
->inode_blocks_per_group
;
2997 if (blks_needed
< overhead
)
2998 blks_needed
= overhead
;
3000 #ifdef RESIZE2FS_DEBUG
3001 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3002 printf("Estimated blocks needed: %llu\n", blks_needed
);
3006 * If at this point we've already added up more "needed" than
3007 * the current size, just return current size as minimum.
3009 if (blks_needed
>= ext2fs_blocks_count(fs
->super
))
3010 return ext2fs_blocks_count(fs
->super
);
3012 * We need to reserve a few extra blocks if extents are
3013 * enabled, in case we need to grow the extent tree. The more
3014 * we shrink the file system, the more space we need.
3016 * The absolute worst case is every single data block is in
3017 * the part of the file system that needs to be evacuated,
3018 * with each data block needs to be in its own extent, and
3019 * with each inode needing at least one extent block.
3021 if (ext2fs_has_feature_extents(fs
->super
)) {
3022 blk64_t safe_margin
= (ext2fs_blocks_count(fs
->super
) -
3024 unsigned int exts_per_blk
= (fs
->blocksize
/
3025 sizeof(struct ext3_extent
)) - 1;
3026 blk64_t worst_case
= ((data_needed
+ exts_per_blk
- 1) /
3029 if (worst_case
< inode_count
)
3030 worst_case
= inode_count
;
3032 if (safe_margin
> worst_case
)
3033 safe_margin
= worst_case
;
3035 #ifdef RESIZE2FS_DEBUG
3036 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3037 printf("Extents safety margin: %llu\n", safe_margin
);
3039 blks_needed
+= safe_margin
;