2 * resize2fs.c --- ext2 main routine
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
7 * Copyright (C) 1999, 2000 by Theodore Ts'o
10 * This file may be redistributed under the terms of the GNU Public
16 * Resizing a filesystem consists of the following phases:
18 * 1. Adjust superblock and write out new parts of the inode
20 * 2. Determine blocks which need to be relocated, and copy the
21 * contents of blocks from their old locations to the new ones.
22 * 3. Scan the inode table, doing the following:
23 * a. If blocks have been moved, update the block
24 * pointers in the inodes and indirect blocks to
25 * point at the new block locations.
26 * b. If parts of the inode table need to be evacuated,
27 * copy inodes from their old locations to their
29 * c. If (b) needs to be done, note which blocks contain
30 * directory information, since we will need to
31 * update the directory information.
32 * 4. Update the directory blocks with the new inode locations.
33 * 5. Move the inode tables, if necessary.
37 #include "resize2fs.h"
40 #ifdef __linux__ /* Kludge for debugging */
41 #define RESIZE2FS_DEBUG
44 static void fix_uninit_block_bitmaps(ext2_filsys fs
);
45 static errcode_t
adjust_superblock(ext2_resize_t rfs
, blk64_t new_size
);
46 static errcode_t
blocks_to_move(ext2_resize_t rfs
);
47 static errcode_t
block_mover(ext2_resize_t rfs
);
48 static errcode_t
inode_scan_and_fix(ext2_resize_t rfs
);
49 static errcode_t
inode_ref_fix(ext2_resize_t rfs
);
50 static errcode_t
move_itables(ext2_resize_t rfs
);
51 static errcode_t
fix_resize_inode(ext2_filsys fs
);
52 static errcode_t
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 succinct... */
84 #define B2C(x) EXT2FS_B2C(fs, (x))
85 #define C2B(x) EXT2FS_C2B(fs, (x))
86 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
87 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
88 #define LT_CLSTR(x, y) (B2C(x) < B2C(y))
89 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
90 #define GT_CLSTR(x, y) (B2C(x) > B2C(y))
92 static int lazy_itable_init
;
95 * This is the top-level routine which does the dirty deed....
97 errcode_t
resize_fs(ext2_filsys fs
, blk64_t
*new_size
, int flags
,
98 errcode_t (*progress
)(ext2_resize_t rfs
, int pass
,
100 unsigned long max_val
))
104 struct resource_track rtrack
, overall_track
;
107 * Create the data structure
109 retval
= ext2fs_get_mem(sizeof(struct ext2_resize_struct
), &rfs
);
113 memset(rfs
, 0, sizeof(struct ext2_resize_struct
));
118 rfs
->progress
= progress
;
120 init_resource_track(&overall_track
, "overall resize2fs", fs
->io
);
121 init_resource_track(&rtrack
, "read_bitmaps", fs
->io
);
122 retval
= ext2fs_read_bitmaps(fs
);
125 print_resource_track(rfs
, &rtrack
, fs
->io
);
127 fs
->super
->s_state
|= EXT2_ERROR_FS
;
128 ext2fs_mark_super_dirty(fs
);
131 init_resource_track(&rtrack
, "fix_uninit_block_bitmaps 1", fs
->io
);
132 fix_uninit_block_bitmaps(fs
);
133 print_resource_track(rfs
, &rtrack
, fs
->io
);
134 retval
= ext2fs_dup_handle(fs
, &rfs
->new_fs
);
138 init_resource_track(&rtrack
, "resize_group_descriptors", fs
->io
);
139 retval
= resize_group_descriptors(rfs
, *new_size
);
142 print_resource_track(rfs
, &rtrack
, fs
->io
);
144 init_resource_track(&rtrack
, "move_bg_metadata", fs
->io
);
145 retval
= move_bg_metadata(rfs
);
148 print_resource_track(rfs
, &rtrack
, fs
->io
);
150 init_resource_track(&rtrack
, "zero_high_bits_in_metadata", fs
->io
);
151 retval
= zero_high_bits_in_inodes(rfs
);
154 print_resource_track(rfs
, &rtrack
, fs
->io
);
156 init_resource_track(&rtrack
, "adjust_superblock", fs
->io
);
157 retval
= adjust_superblock(rfs
, *new_size
);
160 print_resource_track(rfs
, &rtrack
, fs
->io
);
162 init_resource_track(&rtrack
, "fix_uninit_block_bitmaps 2", fs
->io
);
163 fix_uninit_block_bitmaps(rfs
->new_fs
);
164 print_resource_track(rfs
, &rtrack
, fs
->io
);
165 /* Clear the block bitmap uninit flag for the last block group */
166 ext2fs_bg_flags_clear(rfs
->new_fs
, rfs
->new_fs
->group_desc_count
- 1,
167 EXT2_BG_BLOCK_UNINIT
);
169 *new_size
= ext2fs_blocks_count(rfs
->new_fs
->super
);
171 init_resource_track(&rtrack
, "blocks_to_move", fs
->io
);
172 retval
= blocks_to_move(rfs
);
175 print_resource_track(rfs
, &rtrack
, fs
->io
);
177 #ifdef RESIZE2FS_DEBUG
178 if (rfs
->flags
& RESIZE_DEBUG_BMOVE
)
179 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
180 ext2fs_free_blocks_count(rfs
->old_fs
->super
),
181 ext2fs_free_blocks_count(rfs
->new_fs
->super
),
185 init_resource_track(&rtrack
, "block_mover", fs
->io
);
186 retval
= block_mover(rfs
);
189 print_resource_track(rfs
, &rtrack
, fs
->io
);
191 init_resource_track(&rtrack
, "inode_scan_and_fix", fs
->io
);
192 retval
= inode_scan_and_fix(rfs
);
195 print_resource_track(rfs
, &rtrack
, fs
->io
);
197 init_resource_track(&rtrack
, "inode_ref_fix", fs
->io
);
198 retval
= inode_ref_fix(rfs
);
201 print_resource_track(rfs
, &rtrack
, fs
->io
);
203 init_resource_track(&rtrack
, "move_itables", fs
->io
);
204 retval
= move_itables(rfs
);
207 print_resource_track(rfs
, &rtrack
, fs
->io
);
209 retval
= clear_sparse_super2_last_group(rfs
);
213 init_resource_track(&rtrack
, "calculate_summary_stats", fs
->io
);
214 retval
= 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 uninitialized bitmaps
583 static void fix_uninit_block_bitmaps(ext2_filsys fs
)
589 if (!ext2fs_has_group_desc_csum(fs
))
592 for (g
=0; g
< fs
->group_desc_count
; g
++) {
593 if (!(ext2fs_bg_flags_test(fs
, g
, EXT2_BG_BLOCK_UNINIT
)))
596 blk
= ext2fs_group_first_block2(fs
, g
);
597 lblk
= ext2fs_group_last_block2(fs
, g
);
598 ext2fs_unmark_block_bitmap_range2(fs
->block_map
, blk
,
601 ext2fs_reserve_super_and_bgd(fs
, g
, fs
->block_map
);
602 ext2fs_mark_block_bitmap2(fs
->block_map
,
603 ext2fs_block_bitmap_loc(fs
, g
));
604 ext2fs_mark_block_bitmap2(fs
->block_map
,
605 ext2fs_inode_bitmap_loc(fs
, g
));
606 for (i
= 0, blk
= ext2fs_inode_table_loc(fs
, g
);
607 i
< fs
->inode_blocks_per_group
;
609 ext2fs_mark_block_bitmap2(fs
->block_map
, blk
);
613 /* --------------------------------------------------------------------
615 * Resize processing, phase 1.
617 * In this phase we adjust the in-memory superblock information, and
618 * initialize any new parts of the inode table. The new parts of the
619 * inode table are created in virgin disk space, so we can abort here
620 * without any side effects.
621 * --------------------------------------------------------------------
625 * If the group descriptor's bitmap and inode table blocks are valid,
626 * release them in the new filesystem data structure, and mark them as
627 * reserved so the old inode table blocks don't get overwritten.
629 static errcode_t
free_gdp_blocks(ext2_filsys fs
,
630 ext2fs_block_bitmap reserve_blocks
,
637 ext2fs_block_bitmap bg_map
= NULL
;
638 errcode_t retval
= 0;
639 dgrp_t count
= old_fs
->group_desc_count
- fs
->group_desc_count
;
641 /* If bigalloc, don't free metadata living in the same cluster */
642 if (EXT2FS_CLUSTER_RATIO(fs
) > 1) {
643 retval
= ext2fs_allocate_block_bitmap(fs
, "bgdata", &bg_map
);
647 retval
= mark_table_blocks(fs
, bg_map
);
652 for (i
= group
; i
< group
+ count
; i
++) {
653 blk
= ext2fs_block_bitmap_loc(old_fs
, i
);
655 (blk
< ext2fs_blocks_count(fs
->super
)) &&
656 !(bg_map
&& ext2fs_test_block_bitmap2(bg_map
, blk
))) {
657 ext2fs_block_alloc_stats2(fs
, blk
, -1);
658 ext2fs_mark_block_bitmap2(reserve_blocks
, blk
);
661 blk
= ext2fs_inode_bitmap_loc(old_fs
, i
);
663 (blk
< ext2fs_blocks_count(fs
->super
)) &&
664 !(bg_map
&& ext2fs_test_block_bitmap2(bg_map
, blk
))) {
665 ext2fs_block_alloc_stats2(fs
, blk
, -1);
666 ext2fs_mark_block_bitmap2(reserve_blocks
, blk
);
669 blk
= ext2fs_inode_table_loc(old_fs
, i
);
671 j
< fs
->inode_blocks_per_group
; j
++, blk
++) {
672 if (blk
>= ext2fs_blocks_count(fs
->super
) ||
673 (bg_map
&& ext2fs_test_block_bitmap2(bg_map
, blk
)))
675 ext2fs_block_alloc_stats2(fs
, blk
, -1);
676 ext2fs_mark_block_bitmap2(reserve_blocks
, blk
);
682 ext2fs_free_block_bitmap(bg_map
);
687 * This routine is shared by the online and offline resize routines.
688 * All of the information which is adjusted in memory is done here.
690 errcode_t
adjust_fs_info(ext2_filsys fs
, ext2_filsys old_fs
,
691 ext2fs_block_bitmap reserve_blocks
, blk64_t new_size
)
694 blk64_t overhead
= 0;
696 blk64_t blk
, group_block
;
698 blk64_t old_numblocks
, numblocks
, adjblocks
;
699 unsigned long i
, j
, old_desc_blocks
;
700 unsigned int meta_bg
, meta_bg_size
;
701 int has_super
, csum_flag
, has_bg
;
702 unsigned long long new_inodes
; /* u64 to check for overflow */
705 ext2fs_blocks_count_set(fs
->super
, new_size
);
706 fs
->super
->s_overhead_clusters
= 0;
709 fs
->group_desc_count
= ext2fs_div64_ceil(ext2fs_blocks_count(fs
->super
) -
710 fs
->super
->s_first_data_block
,
711 EXT2_BLOCKS_PER_GROUP(fs
->super
));
712 if (fs
->group_desc_count
== 0)
713 return EXT2_ET_TOOSMALL
;
714 fs
->desc_blocks
= ext2fs_div_ceil(fs
->group_desc_count
,
715 EXT2_DESC_PER_BLOCK(fs
->super
));
718 * Overhead is the number of bookkeeping blocks per group. It
719 * includes the superblock backup, the group descriptor
720 * backups, the inode bitmap, the block bitmap, and the inode
723 overhead
= (int) (2 + fs
->inode_blocks_per_group
);
726 if (ext2fs_has_feature_sparse_super2(fs
->super
)) {
728 * We have to do this manually since
729 * super->s_backup_bgs hasn't been set up yet.
731 if (fs
->group_desc_count
== 2)
732 has_bg
= fs
->super
->s_backup_bgs
[0] != 0;
734 has_bg
= fs
->super
->s_backup_bgs
[1] != 0;
736 has_bg
= ext2fs_bg_has_super(fs
, fs
->group_desc_count
- 1);
738 overhead
+= 1 + fs
->desc_blocks
+
739 fs
->super
->s_reserved_gdt_blocks
;
742 * See if the last group is big enough to support the
743 * necessary data structures. If not, we need to get rid of
746 rem
= (ext2fs_blocks_count(fs
->super
) - fs
->super
->s_first_data_block
) %
747 fs
->super
->s_blocks_per_group
;
748 if ((fs
->group_desc_count
== 1) && rem
&& (rem
< overhead
))
749 return EXT2_ET_TOOSMALL
;
750 if ((fs
->group_desc_count
> 1) && rem
&& (rem
< overhead
+50)) {
751 ext2fs_blocks_count_set(fs
->super
,
752 ext2fs_blocks_count(fs
->super
) - rem
);
756 * Adjust the number of inodes
758 new_inodes
=(unsigned long long) fs
->super
->s_inodes_per_group
* fs
->group_desc_count
;
759 if (new_inodes
> ~0U) {
760 fprintf(stderr
, _("inodes (%llu) must be less than %u\n"),
762 return EXT2_ET_TOO_MANY_INODES
;
764 fs
->super
->s_inodes_count
= fs
->super
->s_inodes_per_group
*
765 fs
->group_desc_count
;
768 * Adjust the number of free blocks
770 blk
= ext2fs_blocks_count(old_fs
->super
);
771 if (blk
> ext2fs_blocks_count(fs
->super
))
772 ext2fs_free_blocks_count_set(fs
->super
,
773 ext2fs_free_blocks_count(fs
->super
) -
774 (blk
- ext2fs_blocks_count(fs
->super
)));
776 ext2fs_free_blocks_count_set(fs
->super
,
777 ext2fs_free_blocks_count(fs
->super
) +
778 (ext2fs_blocks_count(fs
->super
) - blk
));
781 * Adjust the number of reserved blocks
783 percent
= (ext2fs_r_blocks_count(old_fs
->super
) * 100.0) /
784 ext2fs_blocks_count(old_fs
->super
);
785 ext2fs_r_blocks_count_set(fs
->super
,
786 (percent
* ext2fs_blocks_count(fs
->super
) /
790 * Adjust the bitmaps for size
792 retval
= ext2fs_resize_inode_bitmap2(fs
->super
->s_inodes_count
,
793 fs
->super
->s_inodes_count
,
795 if (retval
) goto errout
;
797 real_end
= EXT2_GROUPS_TO_BLOCKS(fs
->super
, fs
->group_desc_count
) - 1 +
798 fs
->super
->s_first_data_block
;
799 retval
= ext2fs_resize_block_bitmap2(new_size
- 1,
800 real_end
, fs
->block_map
);
801 if (retval
) goto errout
;
804 * If we are growing the file system, also grow the size of
805 * the reserve_blocks bitmap
807 if (reserve_blocks
&& new_size
> ext2fs_blocks_count(old_fs
->super
)) {
808 retval
= ext2fs_resize_block_bitmap2(new_size
- 1,
809 real_end
, reserve_blocks
);
810 if (retval
) goto errout
;
814 * Reallocate the group descriptors as necessary.
816 if (EXT2_DESC_SIZE(old_fs
->super
) == EXT2_DESC_SIZE(fs
->super
) &&
817 old_fs
->desc_blocks
!= fs
->desc_blocks
) {
818 retval
= ext2fs_resize_mem(old_fs
->desc_blocks
*
820 fs
->desc_blocks
* fs
->blocksize
,
824 if (fs
->desc_blocks
> old_fs
->desc_blocks
)
825 memset((char *) fs
->group_desc
+
826 (old_fs
->desc_blocks
* fs
->blocksize
), 0,
827 (fs
->desc_blocks
- old_fs
->desc_blocks
) *
832 * If the resize_inode feature is set, and we are changing the
833 * number of descriptor blocks, then adjust
834 * s_reserved_gdt_blocks if possible to avoid needing to move
835 * the inode table either now or in the future.
837 * Note: If we're converting to 64bit mode, we did this earlier.
839 if (EXT2_DESC_SIZE(old_fs
->super
) == EXT2_DESC_SIZE(fs
->super
))
840 adjust_reserved_gdt_blocks(old_fs
, fs
);
842 if (ext2fs_has_feature_meta_bg(fs
->super
) &&
843 (fs
->super
->s_first_meta_bg
> fs
->desc_blocks
)) {
844 ext2fs_clear_feature_meta_bg(fs
->super
);
845 fs
->super
->s_first_meta_bg
= 0;
849 * Update the location of the backup superblocks if the
850 * sparse_super2 feature is enabled.
852 if (ext2fs_has_feature_sparse_super2(fs
->super
)) {
853 dgrp_t last_bg
= fs
->group_desc_count
- 1;
854 dgrp_t old_last_bg
= old_fs
->group_desc_count
- 1;
856 if (last_bg
> old_last_bg
) {
857 if (old_fs
->group_desc_count
== 1)
858 fs
->super
->s_backup_bgs
[0] = 1;
859 if ((old_fs
->group_desc_count
< 3 &&
860 fs
->group_desc_count
> 2) ||
861 fs
->super
->s_backup_bgs
[1])
862 fs
->super
->s_backup_bgs
[1] = last_bg
;
863 } else if (last_bg
< old_last_bg
) {
864 if (fs
->super
->s_backup_bgs
[0] > last_bg
)
865 fs
->super
->s_backup_bgs
[0] = 0;
866 if (fs
->super
->s_backup_bgs
[1] > last_bg
)
867 fs
->super
->s_backup_bgs
[1] = 0;
869 old_fs
->super
->s_backup_bgs
[1] == old_last_bg
)
870 fs
->super
->s_backup_bgs
[1] = last_bg
;
875 * If we are shrinking the number of block groups, we're done
878 if (old_fs
->group_desc_count
> fs
->group_desc_count
) {
880 * Check the block groups that we are chopping off
881 * and free any blocks associated with their metadata
883 retval
= free_gdp_blocks(fs
, reserve_blocks
, old_fs
,
884 fs
->group_desc_count
);
889 * Fix the count of the last (old) block group
891 old_numblocks
= (ext2fs_blocks_count(old_fs
->super
) -
892 old_fs
->super
->s_first_data_block
) %
893 old_fs
->super
->s_blocks_per_group
;
895 old_numblocks
= old_fs
->super
->s_blocks_per_group
;
896 if (old_fs
->group_desc_count
== fs
->group_desc_count
) {
897 numblocks
= (ext2fs_blocks_count(fs
->super
) -
898 fs
->super
->s_first_data_block
) %
899 fs
->super
->s_blocks_per_group
;
901 numblocks
= fs
->super
->s_blocks_per_group
;
903 numblocks
= fs
->super
->s_blocks_per_group
;
904 i
= old_fs
->group_desc_count
- 1;
905 ext2fs_bg_free_blocks_count_set(fs
, i
, ext2fs_bg_free_blocks_count(fs
, i
) + (numblocks
- old_numblocks
));
906 ext2fs_group_desc_csum_set(fs
, i
);
909 * If the number of block groups is staying the same, we're
910 * done and can exit now. (If the number block groups is
911 * shrinking, we had exited earlier.)
913 if (old_fs
->group_desc_count
>= fs
->group_desc_count
) {
919 * Initialize the new block group descriptors
921 group_block
= ext2fs_group_first_block2(fs
,
922 old_fs
->group_desc_count
);
923 csum_flag
= ext2fs_has_group_desc_csum(fs
);
924 if (getenv("RESIZE2FS_FORCE_LAZY_ITABLE_INIT") ||
925 (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
926 access("/sys/fs/ext4/features/lazy_itable_init", F_OK
) == 0))
927 lazy_itable_init
= 1;
928 if (ext2fs_has_feature_meta_bg(fs
->super
))
929 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
931 old_desc_blocks
= fs
->desc_blocks
+
932 fs
->super
->s_reserved_gdt_blocks
;
935 * If we changed the number of block_group descriptor blocks,
936 * we need to make sure they are all marked as reserved in the
937 * filesystem's block allocation map.
939 for (i
= 0; i
< old_fs
->group_desc_count
; i
++)
940 ext2fs_reserve_super_and_bgd(fs
, i
, fs
->block_map
);
942 for (i
= old_fs
->group_desc_count
;
943 i
< fs
->group_desc_count
; i
++) {
944 memset(ext2fs_group_desc(fs
, fs
->group_desc
, i
), 0,
945 sizeof(struct ext2_group_desc
));
948 ext2fs_bg_flags_zap(fs
, i
);
950 ext2fs_bg_flags_set(fs
, i
, EXT2_BG_INODE_UNINIT
);
951 if (!lazy_itable_init
)
952 ext2fs_bg_flags_set(fs
, i
,
953 EXT2_BG_INODE_ZEROED
);
954 ext2fs_bg_itable_unused_set(fs
, i
,
955 fs
->super
->s_inodes_per_group
);
958 numblocks
= ext2fs_group_blocks_count(fs
, i
);
959 if ((i
< fs
->group_desc_count
- 1) && csum_flag
)
960 ext2fs_bg_flags_set(fs
, i
, EXT2_BG_BLOCK_UNINIT
);
962 has_super
= ext2fs_bg_has_super(fs
, i
);
964 ext2fs_block_alloc_stats2(fs
, group_block
, +1);
967 meta_bg_size
= EXT2_DESC_PER_BLOCK(fs
->super
);
968 meta_bg
= i
/ meta_bg_size
;
969 if (!ext2fs_has_feature_meta_bg(fs
->super
) ||
970 (meta_bg
< fs
->super
->s_first_meta_bg
)) {
972 for (j
=0; j
< old_desc_blocks
; j
++)
973 ext2fs_block_alloc_stats2(fs
,
974 group_block
+ 1 + j
, +1);
975 adjblocks
+= old_desc_blocks
;
980 if (((i
% meta_bg_size
) == 0) ||
981 ((i
% meta_bg_size
) == 1) ||
982 ((i
% meta_bg_size
) == (meta_bg_size
-1)))
983 ext2fs_block_alloc_stats2(fs
,
984 group_block
+ has_super
, +1);
987 adjblocks
+= 2 + fs
->inode_blocks_per_group
;
989 numblocks
-= adjblocks
;
990 ext2fs_free_blocks_count_set(fs
->super
,
991 ext2fs_free_blocks_count(fs
->super
) - adjblocks
);
992 fs
->super
->s_free_inodes_count
+=
993 fs
->super
->s_inodes_per_group
;
994 ext2fs_bg_free_blocks_count_set(fs
, i
, numblocks
);
995 ext2fs_bg_free_inodes_count_set(fs
, i
,
996 fs
->super
->s_inodes_per_group
);
997 ext2fs_bg_used_dirs_count_set(fs
, i
, 0);
998 ext2fs_group_desc_csum_set(fs
, i
);
1000 retval
= ext2fs_allocate_group_table(fs
, i
, 0);
1001 if (retval
) goto errout
;
1003 group_block
+= fs
->super
->s_blocks_per_group
;
1008 * Mark all of the metadata blocks as reserved so they won't
1009 * get allocated by the call to ext2fs_allocate_group_table()
1010 * in blocks_to_move(), where we allocate new blocks to
1011 * replace those allocation bitmap and inode table blocks
1012 * which have to get relocated to make space for an increased
1013 * number of the block group descriptors.
1016 mark_table_blocks(fs
, reserve_blocks
);
1023 * This routine adjusts the superblock and other data structures, both
1024 * in disk as well as in memory...
1026 static errcode_t
adjust_superblock(ext2_resize_t rfs
, blk64_t new_size
)
1028 ext2_filsys fs
= rfs
->new_fs
;
1031 blk64_t group_block
;
1033 unsigned long max_group
;
1035 ext2fs_mark_super_dirty(fs
);
1036 ext2fs_mark_bb_dirty(fs
);
1037 ext2fs_mark_ib_dirty(fs
);
1039 retval
= ext2fs_allocate_block_bitmap(fs
, _("reserved blocks"),
1040 &rfs
->reserve_blocks
);
1044 retval
= adjust_fs_info(fs
, rfs
->old_fs
, rfs
->reserve_blocks
, new_size
);
1049 * Check to make sure there are enough inodes
1051 if ((rfs
->old_fs
->super
->s_inodes_count
-
1052 rfs
->old_fs
->super
->s_free_inodes_count
) >
1053 rfs
->new_fs
->super
->s_inodes_count
) {
1059 * If we are shrinking the number block groups, we're done and
1062 if (rfs
->old_fs
->group_desc_count
> fs
->group_desc_count
) {
1068 * If the number of block groups is staying the same, we're
1069 * done and can exit now. (If the number block groups is
1070 * shrinking, we had exited earlier.)
1072 if (rfs
->old_fs
->group_desc_count
>= fs
->group_desc_count
) {
1078 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1079 * supports lazy inode initialization, we can skip
1080 * initializing the inode table.
1082 if (lazy_itable_init
&& ext2fs_has_group_desc_csum(fs
)) {
1088 * Initialize the inode table
1090 retval
= ext2fs_get_array(fs
->blocksize
, fs
->inode_blocks_per_group
,
1095 memset(rfs
->itable_buf
, 0, fs
->blocksize
* fs
->inode_blocks_per_group
);
1096 group_block
= ext2fs_group_first_block2(fs
,
1097 rfs
->old_fs
->group_desc_count
);
1098 adj
= rfs
->old_fs
->group_desc_count
;
1099 max_group
= fs
->group_desc_count
- adj
;
1100 if (rfs
->progress
) {
1101 retval
= rfs
->progress(rfs
, E2_RSZ_EXTEND_ITABLE_PASS
,
1106 for (i
= rfs
->old_fs
->group_desc_count
;
1107 i
< fs
->group_desc_count
; i
++) {
1109 * Write out the new inode table
1111 retval
= ext2fs_zero_blocks2(fs
, ext2fs_inode_table_loc(fs
, i
),
1112 fs
->inode_blocks_per_group
, NULL
,
1117 io_channel_flush(fs
->io
);
1118 if (rfs
->progress
) {
1119 retval
= rfs
->progress(rfs
, E2_RSZ_EXTEND_ITABLE_PASS
,
1120 i
- adj
+ 1, max_group
);
1124 group_block
+= fs
->super
->s_blocks_per_group
;
1126 io_channel_flush(fs
->io
);
1133 /* --------------------------------------------------------------------
1135 * Resize processing, phase 2.
1137 * In this phase we adjust determine which blocks need to be moved, in
1138 * blocks_to_move(). We then copy the blocks to their ultimate new
1139 * destinations using block_mover(). Since we are copying blocks to
1140 * their new locations, again during this pass we can abort without
1142 * --------------------------------------------------------------------
1146 * This helper function creates a block bitmap with all of the
1147 * filesystem meta-data blocks.
1149 static errcode_t
mark_table_blocks(ext2_filsys fs
,
1150 ext2fs_block_bitmap bmap
)
1155 for (i
= 0; i
< fs
->group_desc_count
; i
++) {
1156 ext2fs_reserve_super_and_bgd(fs
, i
, bmap
);
1159 * Mark the blocks used for the inode table
1161 blk
= ext2fs_inode_table_loc(fs
, i
);
1163 ext2fs_mark_block_bitmap_range2(bmap
, blk
,
1164 fs
->inode_blocks_per_group
);
1167 * Mark block used for the block bitmap
1169 blk
= ext2fs_block_bitmap_loc(fs
, i
);
1171 ext2fs_mark_block_bitmap2(bmap
, blk
);
1174 * Mark block used for the inode bitmap
1176 blk
= ext2fs_inode_bitmap_loc(fs
, i
);
1178 ext2fs_mark_block_bitmap2(bmap
, blk
);
1184 * This function checks to see if a particular block (either a
1185 * superblock or a block group descriptor) overlaps with an inode or
1186 * block bitmap block, or with the inode table.
1188 static void mark_fs_metablock(ext2_resize_t rfs
,
1189 ext2fs_block_bitmap meta_bmap
,
1190 int group
, blk64_t blk
)
1192 ext2_filsys fs
= rfs
->new_fs
;
1194 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
1195 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1198 * Check to see if we overlap with the inode or block bitmap,
1199 * or the inode tables. If not, and the block is in use, then
1200 * mark it as a block to be moved.
1202 if (is_block_bm(fs
, group
, blk
)) {
1203 ext2fs_block_bitmap_loc_set(fs
, group
, 0);
1204 rfs
->needed_blocks
++;
1207 if (is_inode_bm(fs
, group
, blk
)) {
1208 ext2fs_inode_bitmap_loc_set(fs
, group
, 0);
1209 rfs
->needed_blocks
++;
1212 if (is_inode_tb(fs
, group
, blk
)) {
1213 ext2fs_inode_table_loc_set(fs
, group
, 0);
1214 rfs
->needed_blocks
++;
1217 if (ext2fs_has_feature_flex_bg(fs
->super
)) {
1220 for (i
= 0; i
< rfs
->old_fs
->group_desc_count
; i
++) {
1221 if (is_block_bm(fs
, i
, blk
)) {
1222 ext2fs_block_bitmap_loc_set(fs
, i
, 0);
1223 rfs
->needed_blocks
++;
1226 if (is_inode_bm(fs
, i
, blk
)) {
1227 ext2fs_inode_bitmap_loc_set(fs
, i
, 0);
1228 rfs
->needed_blocks
++;
1231 if (is_inode_tb(fs
, i
, blk
)) {
1232 ext2fs_inode_table_loc_set(fs
, i
, 0);
1233 rfs
->needed_blocks
++;
1239 if (ext2fs_has_group_desc_csum(fs
) &&
1240 (ext2fs_bg_flags_test(fs
, group
, EXT2_BG_BLOCK_UNINIT
))) {
1242 * If the block bitmap is uninitialized, which means
1243 * nothing other than standard metadata in use.
1246 } else if (ext2fs_test_block_bitmap2(rfs
->old_fs
->block_map
, blk
) &&
1247 !ext2fs_test_block_bitmap2(meta_bmap
, blk
)) {
1248 ext2fs_mark_block_bitmap2(rfs
->move_blocks
, blk
);
1249 rfs
->needed_blocks
++;
1255 * This routine marks and unmarks reserved blocks in the new block
1256 * bitmap. It also determines which blocks need to be moved and
1257 * places this information into the move_blocks bitmap.
1259 static errcode_t
blocks_to_move(ext2_resize_t rfs
)
1263 dgrp_t i
, max_groups
, g
;
1264 blk64_t blk
, group_blk
;
1265 blk64_t old_blocks
, new_blocks
, group_end
, cluster_freed
;
1267 unsigned int meta_bg
, meta_bg_size
;
1269 ext2_filsys fs
, old_fs
;
1270 ext2fs_block_bitmap meta_bmap
, new_meta_bmap
= NULL
;
1274 old_fs
= rfs
->old_fs
;
1275 if (ext2fs_blocks_count(old_fs
->super
) > ext2fs_blocks_count(fs
->super
))
1278 retval
= ext2fs_allocate_block_bitmap(fs
, _("blocks to be moved"),
1283 retval
= ext2fs_allocate_block_bitmap(fs
, _("meta-data blocks"),
1288 retval
= mark_table_blocks(old_fs
, meta_bmap
);
1295 * If we're shrinking the filesystem, we need to move any
1296 * group's metadata blocks (either allocation bitmaps or the
1297 * inode table) which are beyond the end of the new
1300 new_size
= ext2fs_blocks_count(fs
->super
);
1301 if (new_size
< ext2fs_blocks_count(old_fs
->super
)) {
1302 for (g
= 0; g
< fs
->group_desc_count
; g
++) {
1305 * ext2fs_allocate_group_table will re-allocate any
1306 * metadata blocks whose location is set to zero.
1308 if (ext2fs_block_bitmap_loc(fs
, g
) >= new_size
) {
1309 ext2fs_block_bitmap_loc_set(fs
, g
, 0);
1312 if (ext2fs_inode_bitmap_loc(fs
, g
) >= new_size
) {
1313 ext2fs_inode_bitmap_loc_set(fs
, g
, 0);
1316 if ((ext2fs_inode_table_loc(fs
, g
) +
1317 fs
->inode_blocks_per_group
) > new_size
) {
1318 ext2fs_inode_table_loc_set(fs
, g
, 0);
1323 retval
= ext2fs_allocate_group_table(fs
, g
, 0);
1331 * If we're shrinking the filesystem, we need to move all of
1332 * the blocks that don't fit any more
1334 for (blk
= ext2fs_blocks_count(fs
->super
);
1335 blk
< ext2fs_blocks_count(old_fs
->super
); blk
++) {
1336 g
= ext2fs_group_of_blk2(fs
, blk
);
1337 if (ext2fs_has_group_desc_csum(fs
) &&
1338 ext2fs_bg_flags_test(old_fs
, g
, EXT2_BG_BLOCK_UNINIT
)) {
1340 * The block bitmap is uninitialized, so skip
1341 * to the next block group.
1343 blk
= ext2fs_group_first_block2(fs
, g
+1) - 1;
1346 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1347 !ext2fs_test_block_bitmap2(meta_bmap
, blk
)) {
1348 ext2fs_mark_block_bitmap2(rfs
->move_blocks
, blk
);
1349 rfs
->needed_blocks
++;
1351 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
1354 if (ext2fs_has_feature_meta_bg(old_fs
->super
))
1355 old_blocks
= old_fs
->super
->s_first_meta_bg
;
1357 old_blocks
= old_fs
->desc_blocks
+
1358 old_fs
->super
->s_reserved_gdt_blocks
;
1359 if (ext2fs_has_feature_meta_bg(fs
->super
))
1360 new_blocks
= fs
->super
->s_first_meta_bg
;
1362 new_blocks
= fs
->desc_blocks
+ fs
->super
->s_reserved_gdt_blocks
;
1364 retval
= reserve_sparse_super2_last_group(rfs
, meta_bmap
);
1368 if (EXT2_DESC_SIZE(rfs
->old_fs
->super
) ==
1369 EXT2_DESC_SIZE(rfs
->new_fs
->super
) &&
1370 old_blocks
== new_blocks
) {
1375 max_groups
= fs
->group_desc_count
;
1376 if (max_groups
> old_fs
->group_desc_count
)
1377 max_groups
= old_fs
->group_desc_count
;
1378 group_blk
= old_fs
->super
->s_first_data_block
;
1380 * If we're reducing the number of descriptor blocks, this
1381 * makes life easy. :-) We just have to mark some extra
1384 if (old_blocks
> new_blocks
) {
1385 if (EXT2FS_CLUSTER_RATIO(fs
) > 1) {
1386 retval
= ext2fs_allocate_block_bitmap(fs
,
1387 _("new meta blocks"),
1392 retval
= mark_table_blocks(fs
, new_meta_bmap
);
1397 for (i
= 0; i
< max_groups
; i
++) {
1398 if (!ext2fs_bg_has_super(old_fs
, i
)) {
1399 group_blk
+= fs
->super
->s_blocks_per_group
;
1402 group_end
= group_blk
+ 1 + old_blocks
;
1403 for (blk
= group_blk
+ 1 + new_blocks
;
1405 if (new_meta_bmap
== NULL
||
1406 !ext2fs_test_block_bitmap2(new_meta_bmap
,
1409 EXT2FS_CLUSTER_RATIO(fs
) -
1411 EXT2FS_CLUSTER_MASK(fs
));
1412 if (cluster_freed
> group_end
- blk
)
1413 cluster_freed
= group_end
- blk
;
1414 ext2fs_block_alloc_stats2(fs
, blk
, -1);
1415 blk
+= EXT2FS_CLUSTER_RATIO(fs
);
1416 rfs
->needed_blocks
-= cluster_freed
;
1419 rfs
->needed_blocks
--;
1422 group_blk
+= fs
->super
->s_blocks_per_group
;
1428 * If we're increasing the number of descriptor blocks, life
1429 * gets interesting....
1431 meta_bg_size
= EXT2_DESC_PER_BLOCK(fs
->super
);
1432 flex_bg
= ext2fs_has_feature_flex_bg(fs
->super
);
1433 /* first reserve all of the existing fs meta blocks */
1434 for (i
= 0; i
< max_groups
; i
++) {
1435 has_super
= ext2fs_bg_has_super(fs
, i
);
1437 mark_fs_metablock(rfs
, meta_bmap
, i
, group_blk
);
1439 meta_bg
= i
/ meta_bg_size
;
1440 if (!ext2fs_has_feature_meta_bg(fs
->super
) ||
1441 (meta_bg
< fs
->super
->s_first_meta_bg
)) {
1443 for (blk
= group_blk
+1;
1444 blk
< group_blk
+ 1 + new_blocks
; blk
++)
1445 mark_fs_metablock(rfs
, meta_bmap
,
1451 if (((i
% meta_bg_size
) == 0) ||
1452 ((i
% meta_bg_size
) == 1) ||
1453 ((i
% meta_bg_size
) == (meta_bg_size
-1)))
1454 mark_fs_metablock(rfs
, meta_bmap
, i
,
1455 group_blk
+ has_super
);
1459 * Reserve the existing meta blocks that we know
1460 * aren't to be moved.
1462 * For flex_bg file systems, in order to avoid
1463 * overwriting fs metadata (especially inode table
1464 * blocks) belonging to a different block group when
1465 * we are relocating the inode tables, we need to
1466 * reserve all existing fs metadata blocks.
1468 if (ext2fs_block_bitmap_loc(fs
, i
))
1469 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1470 ext2fs_block_bitmap_loc(fs
, i
));
1471 else if (flex_bg
&& i
< old_fs
->group_desc_count
)
1472 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1473 ext2fs_block_bitmap_loc(old_fs
, i
));
1475 if (ext2fs_inode_bitmap_loc(fs
, i
))
1476 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1477 ext2fs_inode_bitmap_loc(fs
, i
));
1478 else if (flex_bg
&& i
< old_fs
->group_desc_count
)
1479 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
,
1480 ext2fs_inode_bitmap_loc(old_fs
, i
));
1482 if (ext2fs_inode_table_loc(fs
, i
))
1483 ext2fs_mark_block_bitmap_range2(rfs
->reserve_blocks
,
1484 ext2fs_inode_table_loc(fs
, i
),
1485 fs
->inode_blocks_per_group
);
1486 else if (flex_bg
&& i
< old_fs
->group_desc_count
)
1487 ext2fs_mark_block_bitmap_range2(rfs
->reserve_blocks
,
1488 ext2fs_inode_table_loc(old_fs
, i
),
1489 old_fs
->inode_blocks_per_group
);
1491 group_blk
+= rfs
->new_fs
->super
->s_blocks_per_group
;
1494 /* Allocate the missing data structures */
1495 for (i
= 0; i
< max_groups
; i
++) {
1496 if (ext2fs_inode_table_loc(fs
, i
) &&
1497 ext2fs_inode_bitmap_loc(fs
, i
) &&
1498 ext2fs_block_bitmap_loc(fs
, i
))
1501 retval
= ext2fs_allocate_group_table(fs
, i
,
1502 rfs
->reserve_blocks
);
1507 * For those structures that have changed, we need to
1510 if (ext2fs_block_bitmap_loc(old_fs
, i
) !=
1511 (blk
= ext2fs_block_bitmap_loc(fs
, i
))) {
1512 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1513 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1514 !ext2fs_test_block_bitmap2(meta_bmap
, blk
))
1515 ext2fs_mark_block_bitmap2(rfs
->move_blocks
,
1518 if (ext2fs_inode_bitmap_loc(old_fs
, i
) !=
1519 (blk
= ext2fs_inode_bitmap_loc(fs
, i
))) {
1520 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1521 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1522 !ext2fs_test_block_bitmap2(meta_bmap
, blk
))
1523 ext2fs_mark_block_bitmap2(rfs
->move_blocks
,
1528 * The inode table, if we need to relocate it, is
1529 * handled specially. We have to reserve the blocks
1530 * for both the old and the new inode table, since we
1531 * can't have the inode table be destroyed during the
1532 * block relocation phase.
1534 if (ext2fs_inode_table_loc(fs
, i
) == ext2fs_inode_table_loc(old_fs
, i
))
1535 continue; /* inode table not moved */
1537 rfs
->needed_blocks
+= fs
->inode_blocks_per_group
;
1540 * Mark the new inode table as in use in the new block
1541 * allocation bitmap, and move any blocks that might
1544 for (blk
= ext2fs_inode_table_loc(fs
, i
), j
=0;
1545 j
< fs
->inode_blocks_per_group
; j
++, blk
++) {
1546 ext2fs_block_alloc_stats2(fs
, blk
, +1);
1547 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
1548 !ext2fs_test_block_bitmap2(meta_bmap
, blk
))
1549 ext2fs_mark_block_bitmap2(rfs
->move_blocks
,
1554 * Make sure the old inode table is reserved in the
1555 * block reservation bitmap.
1557 for (blk
= ext2fs_inode_table_loc(rfs
->old_fs
, i
), j
=0;
1558 j
< fs
->inode_blocks_per_group
; j
++, blk
++)
1559 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
1565 ext2fs_free_block_bitmap(new_meta_bmap
);
1567 ext2fs_free_block_bitmap(meta_bmap
);
1573 * This helper function tries to allocate a new block. We try to
1574 * avoid hitting the original group descriptor blocks at least at
1575 * first, since we want to make it possible to recover from a badly
1576 * aborted resize operation as much as possible.
1578 * In the future, I may further modify this routine to balance out
1579 * where we get the new blocks across the various block groups.
1580 * Ideally we would allocate blocks that corresponded with the block
1581 * group of the containing inode, and keep contiguous blocks
1582 * together. However, this very difficult to do efficiently, since we
1583 * don't have the necessary information up front.
1587 #define DESPERATION 2
1589 static void init_block_alloc(ext2_resize_t rfs
)
1591 rfs
->alloc_state
= AVOID_OLD
;
1592 rfs
->new_blk
= rfs
->new_fs
->super
->s_first_data_block
;
1594 /* HACK for testing */
1595 if (ext2fs_blocks_count(rfs
->new_fs
->super
) >
1596 ext2fs_blocks_count(rfs
->old_fs
->super
))
1597 rfs
->new_blk
= ext2fs_blocks_count(rfs
->old_fs
->super
);
1601 static blk64_t
get_new_block(ext2_resize_t rfs
)
1603 ext2_filsys fs
= rfs
->new_fs
;
1606 if (rfs
->new_blk
>= ext2fs_blocks_count(fs
->super
)) {
1607 if (rfs
->alloc_state
== DESPERATION
)
1610 #ifdef RESIZE2FS_DEBUG
1611 if (rfs
->flags
& RESIZE_DEBUG_BMOVE
)
1612 printf("Going into desperation mode "
1613 "for block allocations\n");
1615 rfs
->alloc_state
= DESPERATION
;
1616 rfs
->new_blk
= fs
->super
->s_first_data_block
;
1619 if (ext2fs_test_block_bitmap2(fs
->block_map
, rfs
->new_blk
) ||
1620 ext2fs_test_block_bitmap2(rfs
->reserve_blocks
,
1622 ((rfs
->alloc_state
== AVOID_OLD
) &&
1623 (rfs
->new_blk
< ext2fs_blocks_count(rfs
->old_fs
->super
)) &&
1624 ext2fs_test_block_bitmap2(rfs
->old_fs
->block_map
,
1629 return rfs
->new_blk
;
1633 static errcode_t
resize2fs_get_alloc_block(ext2_filsys fs
,
1634 blk64_t goal
EXT2FS_ATTR((unused
)),
1637 ext2_resize_t rfs
= (ext2_resize_t
) fs
->priv_data
;
1641 blk
= get_new_block(rfs
);
1645 #ifdef RESIZE2FS_DEBUG
1646 if (rfs
->flags
& 0xF)
1647 printf("get_alloc_block allocating %llu\n", blk
);
1650 ext2fs_mark_block_bitmap2(rfs
->old_fs
->block_map
, blk
);
1651 ext2fs_mark_block_bitmap2(rfs
->new_fs
->block_map
, blk
);
1653 group
= ext2fs_group_of_blk2(rfs
->old_fs
, blk
);
1654 ext2fs_clear_block_uninit(rfs
->old_fs
, group
);
1655 group
= ext2fs_group_of_blk2(rfs
->new_fs
, blk
);
1656 ext2fs_clear_block_uninit(rfs
->new_fs
, group
);
1658 *ret
= (blk64_t
) blk
;
1662 static errcode_t
block_mover(ext2_resize_t rfs
)
1664 blk64_t blk
, old_blk
, new_blk
;
1665 ext2_filsys fs
= rfs
->new_fs
;
1666 ext2_filsys old_fs
= rfs
->old_fs
;
1670 ext2_badblocks_list badblock_list
= 0;
1671 int bb_modified
= 0;
1673 fs
->get_alloc_block
= resize2fs_get_alloc_block
;
1674 old_fs
->get_alloc_block
= resize2fs_get_alloc_block
;
1676 retval
= ext2fs_read_bb_inode(old_fs
, &badblock_list
);
1680 new_blk
= fs
->super
->s_first_data_block
;
1681 if (!rfs
->itable_buf
) {
1682 retval
= ext2fs_get_array(fs
->blocksize
,
1683 fs
->inode_blocks_per_group
,
1688 retval
= ext2fs_create_extent_table(&rfs
->bmap
, 0);
1693 * The first step is to figure out where all of the blocks
1696 to_move
= moved
= 0;
1697 init_block_alloc(rfs
);
1698 for (blk
= B2C(old_fs
->super
->s_first_data_block
);
1699 blk
< ext2fs_blocks_count(old_fs
->super
);
1700 blk
+= EXT2FS_CLUSTER_RATIO(fs
)) {
1701 if (!ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
))
1703 if (!ext2fs_test_block_bitmap2(rfs
->move_blocks
, blk
))
1705 if (ext2fs_badblocks_list_test(badblock_list
, blk
)) {
1706 ext2fs_badblocks_list_del(badblock_list
, blk
);
1711 new_blk
= get_new_block(rfs
);
1716 ext2fs_block_alloc_stats2(fs
, new_blk
, +1);
1717 ext2fs_add_extent_entry(rfs
->bmap
, B2C(blk
), B2C(new_blk
));
1723 ext2fs_free_extent_table(rfs
->bmap
);
1731 * Step two is to actually move the blocks
1733 retval
= ext2fs_iterate_extent(rfs
->bmap
, 0, 0, 0);
1734 if (retval
) goto errout
;
1736 if (rfs
->progress
) {
1737 retval
= (rfs
->progress
)(rfs
, E2_RSZ_BLOCK_RELOC_PASS
,
1743 retval
= ext2fs_iterate_extent(rfs
->bmap
, &old_blk
, &new_blk
, &size
);
1744 if (retval
) goto errout
;
1747 old_blk
= C2B(old_blk
);
1748 new_blk
= C2B(new_blk
);
1750 #ifdef RESIZE2FS_DEBUG
1751 if (rfs
->flags
& RESIZE_DEBUG_BMOVE
)
1752 printf("Moving %llu blocks %llu->%llu\n",
1753 size
, old_blk
, new_blk
);
1757 if (c
> fs
->inode_blocks_per_group
)
1758 c
= fs
->inode_blocks_per_group
;
1759 retval
= io_channel_read_blk64(fs
->io
, old_blk
, c
,
1761 if (retval
) goto errout
;
1762 retval
= io_channel_write_blk64(fs
->io
, new_blk
, c
,
1764 if (retval
) goto errout
;
1769 if (rfs
->progress
) {
1770 io_channel_flush(fs
->io
);
1771 retval
= (rfs
->progress
)(rfs
,
1772 E2_RSZ_BLOCK_RELOC_PASS
,
1778 io_channel_flush(fs
->io
);
1782 if (badblock_list
) {
1783 if (!retval
&& bb_modified
)
1784 retval
= ext2fs_update_bb_inode(old_fs
,
1786 ext2fs_badblocks_list_free(badblock_list
);
1792 /* --------------------------------------------------------------------
1794 * Resize processing, phase 3
1796 * --------------------------------------------------------------------
1801 * The extent translation table is stored in clusters so we need to
1802 * take special care when mapping a source block number to its
1803 * destination block number.
1805 static __u64
extent_translate(ext2_filsys fs
, ext2_extent extent
, __u64 old_loc
)
1807 __u64 new_block
= C2B(ext2fs_extent_translate(extent
, B2C(old_loc
)));
1810 new_block
+= old_loc
& (EXT2FS_CLUSTER_RATIO(fs
) - 1);
1814 struct process_block_struct
{
1818 struct ext2_inode
* inode
;
1825 static int process_block(ext2_filsys fs
, blk64_t
*block_nr
,
1826 e2_blkcnt_t blockcnt
,
1827 blk64_t ref_block
EXT2FS_ATTR((unused
)),
1828 int ref_offset
EXT2FS_ATTR((unused
)), void *priv_data
)
1830 struct process_block_struct
*pb
;
1832 blk64_t block
, new_block
;
1835 pb
= (struct process_block_struct
*) priv_data
;
1837 if (pb
->rfs
->bmap
) {
1838 new_block
= extent_translate(fs
, pb
->rfs
->bmap
, block
);
1840 *block_nr
= new_block
;
1841 ret
|= BLOCK_CHANGED
;
1843 #ifdef RESIZE2FS_DEBUG
1844 if (pb
->rfs
->flags
& RESIZE_DEBUG_BMOVE
)
1845 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1846 pb
->old_ino
, blockcnt
, block
,
1854 retval
= ext2fs_add_dir_block2(fs
->dblist
, pb
->ino
,
1855 block
, (int) blockcnt
);
1867 static errcode_t
progress_callback(ext2_filsys fs
,
1868 ext2_inode_scan scan
EXT2FS_ATTR((unused
)),
1869 dgrp_t group
, void * priv_data
)
1871 ext2_resize_t rfs
= (ext2_resize_t
) priv_data
;
1875 * This check is to protect against old ext2 libraries. It
1876 * shouldn't be needed against new libraries.
1881 if (rfs
->progress
) {
1882 io_channel_flush(fs
->io
);
1883 retval
= (rfs
->progress
)(rfs
, E2_RSZ_INODE_SCAN_PASS
,
1884 group
+1, fs
->group_desc_count
);
1892 static errcode_t
migrate_ea_block(ext2_resize_t rfs
, ext2_ino_t ino
,
1893 struct ext2_inode
*inode
, int *changed
)
1899 /* No EA block or no remapping? Quit early. */
1900 if (ext2fs_file_acl_block(rfs
->old_fs
, inode
) == 0 || !rfs
->bmap
)
1902 new_block
= extent_translate(rfs
->old_fs
, rfs
->bmap
,
1903 ext2fs_file_acl_block(rfs
->old_fs
, inode
));
1907 /* Set the new ACL block */
1908 ext2fs_file_acl_block_set(rfs
->old_fs
, inode
, new_block
);
1910 /* Update checksum */
1911 if (ext2fs_has_feature_metadata_csum(rfs
->new_fs
->super
)) {
1912 err
= ext2fs_get_mem(rfs
->old_fs
->blocksize
, &buf
);
1915 rfs
->old_fs
->flags
|= EXT2_FLAG_IGNORE_CSUM_ERRORS
;
1916 err
= ext2fs_read_ext_attr3(rfs
->old_fs
, new_block
, buf
, ino
);
1917 rfs
->old_fs
->flags
&= ~EXT2_FLAG_IGNORE_CSUM_ERRORS
;
1920 err
= ext2fs_write_ext_attr3(rfs
->old_fs
, new_block
, buf
, ino
);
1927 ext2fs_free_mem(&buf
);
1931 static void quiet_com_err_proc(const char *whoami
EXT2FS_ATTR((unused
)),
1932 errcode_t code
EXT2FS_ATTR((unused
)),
1933 const char *fmt
EXT2FS_ATTR((unused
)),
1934 va_list args
EXT2FS_ATTR((unused
)))
1938 static int fix_ea_entries(ext2_extent imap
, struct ext2_ext_attr_entry
*entry
,
1939 struct ext2_ext_attr_entry
*end
, ext2_ino_t last_ino
)
1944 while (entry
< end
&& !EXT2_EXT_IS_LAST_ENTRY(entry
)) {
1945 if (entry
->e_value_inum
> last_ino
) {
1946 new_ino
= ext2fs_extent_translate(imap
,
1947 entry
->e_value_inum
);
1948 entry
->e_value_inum
= new_ino
;
1951 entry
= EXT2_EXT_ATTR_NEXT(entry
);
1956 static int fix_ea_ibody_entries(ext2_extent imap
,
1957 struct ext2_inode_large
*inode
, int inode_size
,
1958 ext2_ino_t last_ino
)
1960 struct ext2_ext_attr_entry
*start
, *end
;
1963 if (inode
->i_extra_isize
== 0)
1966 ea_magic
= (__u32
*)((char *)inode
+ EXT2_GOOD_OLD_INODE_SIZE
+
1967 inode
->i_extra_isize
);
1968 if (*ea_magic
!= EXT2_EXT_ATTR_MAGIC
)
1971 start
= (struct ext2_ext_attr_entry
*)(ea_magic
+ 1);
1972 end
= (struct ext2_ext_attr_entry
*)((char *)inode
+ inode_size
);
1974 return fix_ea_entries(imap
, start
, end
, last_ino
);
1977 static int fix_ea_block_entries(ext2_extent imap
, char *block_buf
,
1978 unsigned int blocksize
, ext2_ino_t last_ino
)
1980 struct ext2_ext_attr_header
*header
;
1981 struct ext2_ext_attr_entry
*start
, *end
;
1983 header
= (struct ext2_ext_attr_header
*)block_buf
;
1984 start
= (struct ext2_ext_attr_entry
*)(header
+1);
1985 end
= (struct ext2_ext_attr_entry
*)(block_buf
+ blocksize
);
1987 return fix_ea_entries(imap
, start
, end
, last_ino
);
1990 /* A simple LRU cache to check recently processed blocks. */
1996 #define BLK_IN_CACHE(b,c) ((b) == (c).blks[0] || (b) == (c).blks[1] || \
1997 (b) == (c).blks[2] || (b) == (c).blks[3])
1998 #define BLK_ADD_CACHE(b,c) { \
1999 (c).blks[(c).cursor] = (b); \
2000 (c).cursor = ((c).cursor + 1) % 4; \
2003 static errcode_t
fix_ea_inode_refs(ext2_resize_t rfs
, struct ext2_inode
*inode
,
2004 char *block_buf
, ext2_ino_t last_ino
)
2006 ext2_filsys fs
= rfs
->new_fs
;
2007 ext2_inode_scan scan
= NULL
;
2009 int inode_size
= EXT2_INODE_SIZE(fs
->super
);
2012 struct blk_cache blk_cache
;
2013 struct ext2_ext_attr_header
*header
;
2016 memset(&blk_cache
, 0, sizeof(blk_cache
));
2018 header
= (struct ext2_ext_attr_header
*)block_buf
;
2020 retval
= ext2fs_open_inode_scan(fs
, 0, &scan
);
2025 retval
= ext2fs_get_next_inode_full(scan
, &ino
, inode
,
2032 if (inode
->i_links_count
== 0 && ino
!= EXT2_RESIZE_INO
)
2033 continue; /* inode not in use */
2035 if (inode_size
!= EXT2_GOOD_OLD_INODE_SIZE
) {
2036 modified
= fix_ea_ibody_entries(rfs
->imap
,
2037 (struct ext2_inode_large
*)inode
,
2038 inode_size
, last_ino
);
2040 retval
= ext2fs_write_inode_full(fs
, ino
, inode
,
2047 blk
= ext2fs_file_acl_block(fs
, inode
);
2048 if (blk
&& !BLK_IN_CACHE(blk
, blk_cache
)) {
2049 retval
= ext2fs_read_ext_attr3(fs
, blk
, block_buf
, ino
);
2053 modified
= fix_ea_block_entries(rfs
->imap
, block_buf
,
2057 retval
= ext2fs_write_ext_attr3(fs
, blk
,
2062 * If refcount is greater than 1, we might see
2063 * the same block referenced by other inodes
2066 if (header
->h_refcount
> 1)
2067 BLK_ADD_CACHE(blk
, blk_cache
);
2074 ext2fs_close_inode_scan(scan
);
2078 static errcode_t
inode_scan_and_fix(ext2_resize_t rfs
)
2080 struct process_block_struct pb
;
2081 ext2_ino_t ino
, new_inode
;
2082 struct ext2_inode
*inode
= NULL
;
2083 ext2_inode_scan scan
= NULL
;
2085 char *block_buf
= 0;
2086 ext2_ino_t start_to_move
;
2088 int update_ea_inode_refs
= 0;
2090 if ((rfs
->old_fs
->group_desc_count
<=
2091 rfs
->new_fs
->group_desc_count
) &&
2095 set_com_err_hook(quiet_com_err_proc
);
2097 retval
= ext2fs_open_inode_scan(rfs
->old_fs
, 0, &scan
);
2098 if (retval
) goto errout
;
2100 retval
= ext2fs_init_dblist(rfs
->old_fs
, 0);
2101 if (retval
) goto errout
;
2102 retval
= ext2fs_get_array(rfs
->old_fs
->blocksize
, 3, &block_buf
);
2103 if (retval
) goto errout
;
2105 start_to_move
= (rfs
->new_fs
->group_desc_count
*
2106 rfs
->new_fs
->super
->s_inodes_per_group
);
2108 if (rfs
->progress
) {
2109 retval
= (rfs
->progress
)(rfs
, E2_RSZ_INODE_SCAN_PASS
,
2110 0, rfs
->old_fs
->group_desc_count
);
2114 ext2fs_set_inode_callback(scan
, progress_callback
, (void *) rfs
);
2118 new_inode
= EXT2_FIRST_INODE(rfs
->new_fs
->super
);
2119 inode_size
= EXT2_INODE_SIZE(rfs
->new_fs
->super
);
2120 inode
= malloc(inode_size
);
2126 * First, copy all of the inodes that need to be moved
2127 * elsewhere in the inode table
2130 retval
= ext2fs_get_next_inode_full(scan
, &ino
, inode
, inode_size
);
2131 if (retval
) goto errout
;
2135 if (inode
->i_links_count
== 0 && ino
!= EXT2_RESIZE_INO
)
2136 continue; /* inode not in use */
2138 pb
.is_dir
= LINUX_S_ISDIR(inode
->i_mode
);
2141 /* Remap EA block */
2142 retval
= migrate_ea_block(rfs
, ino
, inode
, &pb
.changed
);
2147 if (ino
<= start_to_move
)
2148 goto remap_blocks
; /* Don't need to move inode. */
2151 * Find a new inode. Now that extents and directory blocks
2152 * are tied to the inode number through the checksum, we must
2153 * set up the new inode before we start rewriting blocks.
2155 retval
= ext2fs_new_inode(rfs
->new_fs
, 0, 0, 0, &new_inode
);
2159 ext2fs_inode_alloc_stats2(rfs
->new_fs
, new_inode
, +1,
2162 * i_ctime field in xattr inodes contain a portion of the ref
2163 * count, do not overwrite.
2165 if (inode
->i_flags
& EXT4_EA_INODE_FL
)
2166 update_ea_inode_refs
= 1;
2168 inode
->i_ctime
= time(0);
2170 retval
= ext2fs_write_inode_full(rfs
->old_fs
, new_inode
,
2176 #ifdef RESIZE2FS_DEBUG
2177 if (rfs
->flags
& RESIZE_DEBUG_INODEMAP
)
2178 printf("Inode moved %u->%u\n", ino
, new_inode
);
2181 retval
= ext2fs_create_extent_table(&rfs
->imap
, 0);
2185 ext2fs_add_extent_entry(rfs
->imap
, ino
, new_inode
);
2189 retval
= ext2fs_write_inode_full(rfs
->old_fs
,
2196 * Update inodes to point to new blocks; schedule directory
2197 * blocks for inode remapping. Need to write out dir blocks
2198 * with new inode numbers if we have metadata_csum enabled.
2200 rfs
->old_fs
->flags
|= EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2201 if (ext2fs_inode_has_valid_blocks2(rfs
->old_fs
, inode
) &&
2202 (rfs
->bmap
|| pb
.is_dir
)) {
2205 pb
.has_extents
= inode
->i_flags
& EXT4_EXTENTS_FL
;
2206 retval
= ext2fs_block_iterate3(rfs
->old_fs
,
2207 new_inode
, 0, block_buf
,
2208 process_block
, &pb
);
2215 } else if ((inode
->i_flags
& EXT4_INLINE_DATA_FL
) &&
2216 (rfs
->bmap
|| pb
.is_dir
)) {
2217 /* inline data dir; update it too */
2218 retval
= ext2fs_add_dir_block2(rfs
->old_fs
->dblist
,
2224 /* Fix up extent block checksums with the new inode number */
2225 if (ext2fs_has_feature_metadata_csum(rfs
->old_fs
->super
) &&
2226 (inode
->i_flags
& EXT4_EXTENTS_FL
)) {
2227 retval
= ext2fs_fix_extents_checksums(rfs
->old_fs
,
2234 if (update_ea_inode_refs
&&
2235 ext2fs_has_feature_ea_inode(rfs
->new_fs
->super
)) {
2236 retval
= fix_ea_inode_refs(rfs
, inode
, block_buf
,
2241 io_channel_flush(rfs
->old_fs
->io
);
2244 reset_com_err_hook();
2245 rfs
->old_fs
->flags
&= ~EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2247 ext2fs_free_extent_table(rfs
->bmap
);
2251 ext2fs_close_inode_scan(scan
);
2253 ext2fs_free_mem(&block_buf
);
2258 /* --------------------------------------------------------------------
2260 * Resize processing, phase 4.
2262 * --------------------------------------------------------------------
2268 unsigned int max_dirs
;
2272 static int check_and_change_inodes(ext2_ino_t dir
,
2273 int entry
EXT2FS_ATTR((unused
)),
2274 struct ext2_dir_entry
*dirent
, int offset
,
2275 int blocksize
EXT2FS_ATTR((unused
)),
2276 char *buf
EXT2FS_ATTR((unused
)),
2279 struct istruct
*is
= (struct istruct
*) priv_data
;
2280 struct ext2_inode inode
;
2281 ext2_ino_t new_inode
;
2285 if (is
->rfs
->progress
&& offset
== 0) {
2286 io_channel_flush(is
->rfs
->old_fs
->io
);
2287 is
->err
= (is
->rfs
->progress
)(is
->rfs
,
2288 E2_RSZ_INODE_REF_UPD_PASS
,
2289 ++is
->num
, is
->max_dirs
);
2291 return DIRENT_ABORT
;
2295 * If we have checksums enabled and the inode wasn't present in the
2296 * old fs, then we must rewrite all dir blocks with new checksums.
2298 if (ext2fs_has_feature_metadata_csum(is
->rfs
->old_fs
->super
) &&
2299 !ext2fs_test_inode_bitmap2(is
->rfs
->old_fs
->inode_map
, dir
))
2300 ret
|= DIRENT_CHANGED
;
2305 new_inode
= ext2fs_extent_translate(is
->rfs
->imap
, dirent
->inode
);
2309 #ifdef RESIZE2FS_DEBUG
2310 if (is
->rfs
->flags
& RESIZE_DEBUG_INODEMAP
)
2311 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2312 dir
, ext2fs_dirent_name_len(dirent
), dirent
->name
,
2313 dirent
->inode
, new_inode
);
2316 dirent
->inode
= new_inode
;
2318 /* Update the directory mtime and ctime */
2319 retval
= ext2fs_read_inode(is
->rfs
->old_fs
, dir
, &inode
);
2321 inode
.i_mtime
= inode
.i_ctime
= time(0);
2322 is
->err
= ext2fs_write_inode(is
->rfs
->old_fs
, dir
, &inode
);
2324 return ret
| DIRENT_ABORT
;
2327 return ret
| DIRENT_CHANGED
;
2330 static errcode_t
inode_ref_fix(ext2_resize_t rfs
)
2339 * Now, we iterate over all of the directories to update the
2343 is
.max_dirs
= ext2fs_dblist_count2(rfs
->old_fs
->dblist
);
2347 if (rfs
->progress
) {
2348 retval
= (rfs
->progress
)(rfs
, E2_RSZ_INODE_REF_UPD_PASS
,
2354 rfs
->old_fs
->flags
|= EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2355 retval
= ext2fs_dblist_dir_iterate(rfs
->old_fs
->dblist
,
2356 DIRENT_FLAG_INCLUDE_EMPTY
, 0,
2357 check_and_change_inodes
, &is
);
2358 rfs
->old_fs
->flags
&= ~EXT2_FLAG_IGNORE_CSUM_ERRORS
;
2366 if (rfs
->progress
&& (is
.num
< is
.max_dirs
))
2367 (rfs
->progress
)(rfs
, E2_RSZ_INODE_REF_UPD_PASS
,
2368 is
.max_dirs
, is
.max_dirs
);
2371 ext2fs_free_extent_table(rfs
->imap
);
2377 /* --------------------------------------------------------------------
2379 * Resize processing, phase 5.
2381 * In this phase we actually move the inode table around, and then
2382 * update the summary statistics. This is scary, since aborting here
2383 * will potentially scramble the filesystem. (We are moving the
2384 * inode tables around in place, and so the potential for lost data,
2385 * or at the very least scrambling the mapping between filenames and
2386 * inode numbers is very high in case of a power failure here.)
2387 * --------------------------------------------------------------------
2392 * A very scary routine --- this one moves the inode table around!!!
2394 * After this you have to use the rfs->new_fs file handle to read and
2397 static errcode_t
move_itables(ext2_resize_t rfs
)
2401 dgrp_t i
, max_groups
;
2402 ext2_filsys fs
= rfs
->new_fs
;
2404 blk64_t old_blk
, new_blk
, blk
, cluster_freed
;
2408 ext2fs_block_bitmap new_bmap
= NULL
;
2410 max_groups
= fs
->group_desc_count
;
2411 if (max_groups
> rfs
->old_fs
->group_desc_count
)
2412 max_groups
= rfs
->old_fs
->group_desc_count
;
2414 size
= fs
->blocksize
* fs
->inode_blocks_per_group
;
2415 if (!rfs
->itable_buf
) {
2416 retval
= ext2fs_get_mem(size
, &rfs
->itable_buf
);
2421 if (EXT2FS_CLUSTER_RATIO(fs
) > 1) {
2422 retval
= ext2fs_allocate_block_bitmap(fs
, _("new meta blocks"),
2427 retval
= mark_table_blocks(fs
, new_bmap
);
2433 * Figure out how many inode tables we need to move
2435 to_move
= moved
= 0;
2436 for (i
=0; i
< max_groups
; i
++)
2437 if (ext2fs_inode_table_loc(rfs
->old_fs
, i
) !=
2438 ext2fs_inode_table_loc(fs
, i
))
2446 if (rfs
->progress
) {
2447 retval
= rfs
->progress(rfs
, E2_RSZ_MOVE_ITABLE_PASS
,
2453 rfs
->old_fs
->flags
|= EXT2_FLAG_MASTER_SB_ONLY
;
2455 for (i
=0; i
< max_groups
; i
++) {
2456 old_blk
= ext2fs_inode_table_loc(rfs
->old_fs
, i
);
2457 new_blk
= ext2fs_inode_table_loc(fs
, i
);
2458 diff
= new_blk
- old_blk
;
2460 #ifdef RESIZE2FS_DEBUG
2461 if (rfs
->flags
& RESIZE_DEBUG_ITABLEMOVE
)
2462 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2463 i
, old_blk
, new_blk
, diff
);
2471 retval
= io_channel_read_blk64(fs
->io
, old_blk
,
2472 fs
->inode_blocks_per_group
,
2477 * The end of the inode table segment often contains
2478 * all zeros, and we're often only moving the inode
2479 * table down a block or two. If so, we can optimize
2480 * things by not rewriting blocks that we know to be zero
2483 for (cp
= rfs
->itable_buf
+size
-1, n
=0; n
< size
; n
++, cp
--)
2486 n
= n
>> EXT2_BLOCK_SIZE_BITS(fs
->super
);
2487 #ifdef RESIZE2FS_DEBUG
2488 if (rfs
->flags
& RESIZE_DEBUG_ITABLEMOVE
)
2489 printf("%d blocks of zeros...\n", n
);
2491 num
= fs
->inode_blocks_per_group
;
2495 retval
= io_channel_write_blk64(fs
->io
, new_blk
,
2496 num
, rfs
->itable_buf
);
2498 io_channel_write_blk64(fs
->io
, old_blk
,
2499 num
, rfs
->itable_buf
);
2503 retval
= io_channel_write_blk64(fs
->io
,
2504 old_blk
+ fs
->inode_blocks_per_group
,
2505 diff
, (rfs
->itable_buf
+
2506 (fs
->inode_blocks_per_group
- diff
) *
2512 for (blk
= ext2fs_inode_table_loc(rfs
->old_fs
, i
), j
=0;
2513 j
< fs
->inode_blocks_per_group
;) {
2514 if (new_bmap
== NULL
||
2515 !ext2fs_test_block_bitmap2(new_bmap
, blk
)) {
2516 ext2fs_block_alloc_stats2(fs
, blk
, -1);
2517 cluster_freed
= EXT2FS_CLUSTER_RATIO(fs
) -
2518 (blk
& EXT2FS_CLUSTER_MASK(fs
));
2519 blk
+= cluster_freed
;
2527 ext2fs_inode_table_loc_set(rfs
->old_fs
, i
, new_blk
);
2528 ext2fs_group_desc_csum_set(rfs
->old_fs
, i
);
2529 ext2fs_mark_super_dirty(rfs
->old_fs
);
2530 ext2fs_flush(rfs
->old_fs
);
2532 if (rfs
->progress
) {
2533 retval
= rfs
->progress(rfs
, E2_RSZ_MOVE_ITABLE_PASS
,
2539 mark_table_blocks(fs
, fs
->block_map
);
2541 #ifdef RESIZE2FS_DEBUG
2542 if (rfs
->flags
& RESIZE_DEBUG_ITABLEMOVE
)
2543 printf("Inode table move finished.\n");
2549 ext2fs_free_block_bitmap(new_bmap
);
2554 * This function is used when expanding a file system. It frees the
2555 * superblock and block group descriptor blocks from the block group
2556 * which is no longer the last block group.
2558 static errcode_t
clear_sparse_super2_last_group(ext2_resize_t rfs
)
2560 ext2_filsys fs
= rfs
->new_fs
;
2561 ext2_filsys old_fs
= rfs
->old_fs
;
2563 dgrp_t old_last_bg
= rfs
->old_fs
->group_desc_count
- 1;
2564 dgrp_t last_bg
= fs
->group_desc_count
- 1;
2565 blk64_t sb
, old_desc
;
2568 if (!ext2fs_has_feature_sparse_super2(fs
->super
))
2571 if (last_bg
<= old_last_bg
)
2574 if (fs
->super
->s_backup_bgs
[0] == old_fs
->super
->s_backup_bgs
[0] &&
2575 fs
->super
->s_backup_bgs
[1] == old_fs
->super
->s_backup_bgs
[1])
2578 if (old_fs
->super
->s_backup_bgs
[0] != old_last_bg
&&
2579 old_fs
->super
->s_backup_bgs
[1] != old_last_bg
)
2582 if (fs
->super
->s_backup_bgs
[0] == old_last_bg
||
2583 fs
->super
->s_backup_bgs
[1] == old_last_bg
)
2586 if (old_last_bg
== 0)
2589 retval
= ext2fs_super_and_bgd_loc2(rfs
->old_fs
, old_last_bg
,
2590 &sb
, &old_desc
, NULL
, &num
);
2595 ext2fs_unmark_block_bitmap2(fs
->block_map
, sb
);
2597 ext2fs_unmark_block_bitmap_range2(fs
->block_map
, old_desc
, num
);
2602 * This function is used when shrinking a file system. We need to
2603 * utilize blocks from what will be the new last block group for the
2604 * backup superblock and block group descriptor blocks.
2605 * Unfortunately, those blocks may be used by other files or fs
2606 * metadata blocks. We need to mark them as being in use.
2608 static errcode_t
reserve_sparse_super2_last_group(ext2_resize_t rfs
,
2609 ext2fs_block_bitmap meta_bmap
)
2611 ext2_filsys fs
= rfs
->new_fs
;
2612 ext2_filsys old_fs
= rfs
->old_fs
;
2614 dgrp_t old_last_bg
= rfs
->old_fs
->group_desc_count
- 1;
2615 dgrp_t last_bg
= fs
->group_desc_count
- 1;
2617 blk64_t blk
, sb
, old_desc
;
2621 if (!ext2fs_has_feature_sparse_super2(fs
->super
))
2624 if (last_bg
>= old_last_bg
)
2627 if (fs
->super
->s_backup_bgs
[0] == old_fs
->super
->s_backup_bgs
[0] &&
2628 fs
->super
->s_backup_bgs
[1] == old_fs
->super
->s_backup_bgs
[1])
2631 if (fs
->super
->s_backup_bgs
[0] != last_bg
&&
2632 fs
->super
->s_backup_bgs
[1] != last_bg
)
2635 if (old_fs
->super
->s_backup_bgs
[0] == last_bg
||
2636 old_fs
->super
->s_backup_bgs
[1] == last_bg
)
2639 retval
= ext2fs_super_and_bgd_loc2(rfs
->new_fs
, last_bg
,
2640 &sb
, &old_desc
, NULL
, &num
);
2644 if (last_bg
&& !sb
) {
2645 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2649 if (old_desc
&& old_desc
!= sb
+1) {
2650 fputs(_("Should never happen! Unexpected old_desc in "
2651 "super_sparse bg?\n"),
2655 num
= (old_desc
) ? num
: 1;
2657 /* Reserve the backup blocks */
2658 ext2fs_mark_block_bitmap_range2(fs
->block_map
, sb
, num
);
2660 for (g
= 0; g
< fs
->group_desc_count
; g
++) {
2663 mb
= ext2fs_block_bitmap_loc(fs
, g
);
2664 if ((mb
>= sb
) && (mb
< sb
+ num
)) {
2665 ext2fs_block_bitmap_loc_set(fs
, g
, 0);
2668 mb
= ext2fs_inode_bitmap_loc(fs
, g
);
2669 if ((mb
>= sb
) && (mb
< sb
+ num
)) {
2670 ext2fs_inode_bitmap_loc_set(fs
, g
, 0);
2673 mb
= ext2fs_inode_table_loc(fs
, g
);
2674 if ((mb
< sb
+ num
) &&
2675 (sb
< mb
+ fs
->inode_blocks_per_group
)) {
2676 ext2fs_inode_table_loc_set(fs
, g
, 0);
2680 retval
= ext2fs_allocate_group_table(fs
, g
, 0);
2686 for (blk
= sb
, i
= 0; i
< num
; blk
++, i
++) {
2687 if (ext2fs_test_block_bitmap2(old_fs
->block_map
, blk
) &&
2688 !ext2fs_test_block_bitmap2(meta_bmap
, blk
)) {
2689 ext2fs_mark_block_bitmap2(rfs
->move_blocks
, blk
);
2690 rfs
->needed_blocks
++;
2692 ext2fs_mark_block_bitmap2(rfs
->reserve_blocks
, blk
);
2698 * Fix the resize inode
2700 static errcode_t
fix_resize_inode(ext2_filsys fs
)
2702 struct ext2_inode inode
;
2705 if (!ext2fs_has_feature_resize_inode(fs
->super
))
2708 retval
= ext2fs_read_inode(fs
, EXT2_RESIZE_INO
, &inode
);
2709 if (retval
) goto errout
;
2711 ext2fs_iblk_set(fs
, &inode
, 1);
2713 retval
= ext2fs_write_inode(fs
, EXT2_RESIZE_INO
, &inode
);
2714 if (retval
) goto errout
;
2716 if (!inode
.i_block
[EXT2_DIND_BLOCK
]) {
2718 * Avoid zeroing out block #0; that's rude. This
2719 * should never happen anyway since the filesystem
2720 * should be fsck'ed and we assume it is consistent.
2722 fprintf(stderr
, "%s",
2723 _("Should never happen: resize inode corrupt!\n"));
2727 retval
= ext2fs_zero_blocks2(fs
, inode
.i_block
[EXT2_DIND_BLOCK
], 1,
2732 retval
= ext2fs_create_resize_inode(fs
);
2741 * Finally, recalculate the summary information
2743 static errcode_t
ext2fs_calculate_summary_stats(ext2_filsys fs
)
2747 unsigned int group
= 0;
2748 unsigned int count
= 0;
2749 blk64_t total_blocks_free
= 0;
2750 int total_inodes_free
= 0;
2753 blk64_t super_blk
, old_desc_blk
, new_desc_blk
;
2754 int old_desc_blocks
;
2757 * First calculate the block statistics
2759 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_BLOCK_UNINIT
);
2760 ext2fs_super_and_bgd_loc2(fs
, group
, &super_blk
, &old_desc_blk
,
2762 if (ext2fs_has_feature_meta_bg(fs
->super
))
2763 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
2765 old_desc_blocks
= fs
->desc_blocks
+
2766 fs
->super
->s_reserved_gdt_blocks
;
2767 for (blk
= B2C(fs
->super
->s_first_data_block
);
2768 blk
< ext2fs_blocks_count(fs
->super
);
2769 blk
+= EXT2FS_CLUSTER_RATIO(fs
)) {
2771 !(EQ_CLSTR(blk
, super_blk
) ||
2772 ((old_desc_blk
&& old_desc_blocks
&&
2773 GE_CLSTR(blk
, old_desc_blk
) &&
2774 LT_CLSTR(blk
, old_desc_blk
+ old_desc_blocks
))) ||
2775 ((new_desc_blk
&& EQ_CLSTR(blk
, new_desc_blk
))) ||
2776 EQ_CLSTR(blk
, ext2fs_block_bitmap_loc(fs
, group
)) ||
2777 EQ_CLSTR(blk
, ext2fs_inode_bitmap_loc(fs
, group
)) ||
2778 ((GE_CLSTR(blk
, ext2fs_inode_table_loc(fs
, group
)) &&
2779 LT_CLSTR(blk
, ext2fs_inode_table_loc(fs
, group
)
2780 + fs
->inode_blocks_per_group
))))) ||
2781 (!ext2fs_fast_test_block_bitmap2(fs
->block_map
, blk
))) {
2783 total_blocks_free
++;
2786 if ((count
== fs
->super
->s_clusters_per_group
) ||
2787 EQ_CLSTR(blk
, ext2fs_blocks_count(fs
->super
)-1)) {
2788 ext2fs_bg_free_blocks_count_set(fs
, group
, group_free
);
2789 ext2fs_group_desc_csum_set(fs
, group
);
2791 if (group
>= fs
->group_desc_count
)
2795 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_BLOCK_UNINIT
);
2796 ext2fs_super_and_bgd_loc2(fs
, group
, &super_blk
,
2799 if (ext2fs_has_feature_meta_bg(fs
->super
))
2800 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
2802 old_desc_blocks
= fs
->desc_blocks
+
2803 fs
->super
->s_reserved_gdt_blocks
;
2806 total_blocks_free
= C2B(total_blocks_free
);
2807 ext2fs_free_blocks_count_set(fs
->super
, total_blocks_free
);
2810 * Next, calculate the inode statistics
2816 /* Protect loop from wrap-around if s_inodes_count maxed */
2817 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_INODE_UNINIT
);
2818 for (ino
= 1; ino
<= fs
->super
->s_inodes_count
&& ino
> 0; ino
++) {
2820 !ext2fs_fast_test_inode_bitmap2(fs
->inode_map
, ino
)) {
2822 total_inodes_free
++;
2825 if ((count
== fs
->super
->s_inodes_per_group
) ||
2826 (ino
== fs
->super
->s_inodes_count
)) {
2827 ext2fs_bg_free_inodes_count_set(fs
, group
, group_free
);
2828 ext2fs_group_desc_csum_set(fs
, group
);
2830 if (group
>= fs
->group_desc_count
)
2834 uninit
= ext2fs_bg_flags_test(fs
, group
, EXT2_BG_INODE_UNINIT
);
2837 fs
->super
->s_free_inodes_count
= total_inodes_free
;
2838 ext2fs_mark_super_dirty(fs
);
2843 * Journal may have been relocated; update the backup journal blocks
2844 * in the superblock.
2846 static errcode_t
fix_sb_journal_backup(ext2_filsys fs
)
2849 struct ext2_inode inode
;
2851 if (!ext2fs_has_feature_journal(fs
->super
))
2854 /* External journal? Nothing to do. */
2855 if (fs
->super
->s_journal_dev
&& !fs
->super
->s_journal_inum
)
2858 retval
= ext2fs_read_inode(fs
, fs
->super
->s_journal_inum
, &inode
);
2861 memcpy(fs
->super
->s_jnl_blocks
, inode
.i_block
, EXT2_N_BLOCKS
*4);
2862 fs
->super
->s_jnl_blocks
[15] = inode
.i_size_high
;
2863 fs
->super
->s_jnl_blocks
[16] = inode
.i_size
;
2864 fs
->super
->s_jnl_backup_type
= EXT3_JNL_BACKUP_BLOCKS
;
2865 ext2fs_mark_super_dirty(fs
);
2869 static int calc_group_overhead(ext2_filsys fs
, blk64_t grp
,
2870 int old_desc_blocks
)
2872 blk64_t super_blk
, old_desc_blk
, new_desc_blk
;
2875 /* inode table blocks plus allocation bitmaps */
2876 overhead
= fs
->inode_blocks_per_group
+ 2;
2878 ext2fs_super_and_bgd_loc2(fs
, grp
, &super_blk
,
2879 &old_desc_blk
, &new_desc_blk
, 0);
2880 if ((grp
== 0) || super_blk
)
2883 overhead
+= old_desc_blocks
;
2884 else if (new_desc_blk
)
2891 * calculate the minimum number of blocks the given fs can be resized to
2893 blk64_t
calculate_minimum_resize_size(ext2_filsys fs
, int flags
)
2895 ext2_ino_t inode_count
;
2896 dgrp_t groups
, flex_groups
;
2897 blk64_t blks_needed
, data_blocks
;
2898 blk64_t grp
, data_needed
, last_start
;
2899 blk64_t overhead
= 0;
2900 int old_desc_blocks
;
2901 int flexbg_size
= 1 << fs
->super
->s_log_groups_per_flex
;
2904 * first figure out how many group descriptors we need to
2905 * handle the number of inodes we have
2907 inode_count
= fs
->super
->s_inodes_count
-
2908 fs
->super
->s_free_inodes_count
;
2909 blks_needed
= ext2fs_div_ceil(inode_count
,
2910 fs
->super
->s_inodes_per_group
) *
2911 (blk64_t
) EXT2_BLOCKS_PER_GROUP(fs
->super
);
2912 groups
= ext2fs_div64_ceil(blks_needed
,
2913 EXT2_BLOCKS_PER_GROUP(fs
->super
));
2914 #ifdef RESIZE2FS_DEBUG
2915 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2916 printf("fs has %d inodes, %d groups required.\n",
2917 inode_count
, groups
);
2921 * number of old-style block group descriptor blocks
2923 if (ext2fs_has_feature_meta_bg(fs
->super
))
2924 old_desc_blocks
= fs
->super
->s_first_meta_bg
;
2926 old_desc_blocks
= fs
->desc_blocks
+
2927 fs
->super
->s_reserved_gdt_blocks
;
2929 /* calculate how many blocks are needed for data */
2930 data_needed
= ext2fs_blocks_count(fs
->super
);
2931 for (grp
= 0; grp
< fs
->group_desc_count
; grp
++) {
2932 data_needed
-= calc_group_overhead(fs
, grp
, old_desc_blocks
);
2933 data_needed
-= ext2fs_bg_free_blocks_count(fs
, grp
);
2935 #ifdef RESIZE2FS_DEBUG
2936 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2937 printf("fs requires %llu data blocks.\n", data_needed
);
2941 * For ext4 we need to allow for up to a flex_bg worth of
2942 * inode tables of slack space so the resize operation can be
2943 * guaranteed to finish.
2945 flex_groups
= groups
;
2946 if (ext2fs_has_feature_flex_bg(fs
->super
)) {
2947 dgrp_t remainder
= groups
& (flexbg_size
- 1);
2949 flex_groups
+= flexbg_size
- remainder
;
2950 if (flex_groups
> fs
->group_desc_count
)
2951 flex_groups
= fs
->group_desc_count
;
2955 * figure out how many data blocks we have given the number of groups
2956 * we need for our inodes
2958 data_blocks
= EXT2_GROUPS_TO_BLOCKS(fs
->super
, groups
);
2960 for (grp
= 0; grp
< flex_groups
; grp
++) {
2961 overhead
= calc_group_overhead(fs
, grp
, old_desc_blocks
);
2964 * we want to keep track of how much data we can store in
2965 * the groups leading up to the last group so we can determine
2966 * how big the last group needs to be
2968 if (grp
< (groups
- 1))
2969 last_start
+= EXT2_BLOCKS_PER_GROUP(fs
->super
) -
2972 if (data_blocks
> overhead
)
2973 data_blocks
-= overhead
;
2977 #ifdef RESIZE2FS_DEBUG
2978 if (flags
& RESIZE_DEBUG_MIN_CALC
)
2979 printf("With %d group(s), we have %llu blocks available.\n",
2980 groups
, data_blocks
);
2984 * if we need more group descriptors in order to accommodate our data
2985 * then we need to add them here
2987 blks_needed
= data_needed
;
2988 while (blks_needed
> data_blocks
) {
2989 blk64_t remainder
= blks_needed
- data_blocks
;
2992 /* figure out how many more groups we need for the data */
2993 extra_grps
= ext2fs_div64_ceil(remainder
,
2994 EXT2_BLOCKS_PER_GROUP(fs
->super
));
2996 data_blocks
+= EXT2_GROUPS_TO_BLOCKS(fs
->super
, extra_grps
);
2998 /* ok we have to account for the last group */
2999 overhead
= calc_group_overhead(fs
, groups
-1, old_desc_blocks
);
3000 last_start
+= EXT2_BLOCKS_PER_GROUP(fs
->super
) - overhead
;
3003 groups
+= extra_grps
;
3004 if (!ext2fs_has_feature_flex_bg(fs
->super
))
3005 flex_groups
= groups
;
3006 else if (groups
> flex_groups
) {
3007 dgrp_t r
= groups
& (flexbg_size
- 1);
3009 flex_groups
= groups
+ flexbg_size
- r
;
3010 if (flex_groups
> fs
->group_desc_count
)
3011 flex_groups
= fs
->group_desc_count
;
3014 for (; grp
< flex_groups
; grp
++) {
3015 overhead
= calc_group_overhead(fs
, grp
,
3019 * again, we need to see how much data we cram into
3020 * all of the groups leading up to the last group
3022 if (grp
< groups
- 1)
3023 last_start
+= EXT2_BLOCKS_PER_GROUP(fs
->super
)
3026 data_blocks
-= overhead
;
3029 #ifdef RESIZE2FS_DEBUG
3030 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3031 printf("Added %d extra group(s), "
3032 "blks_needed %llu, data_blocks %llu, "
3033 "last_start %llu\n", extra_grps
, blks_needed
,
3034 data_blocks
, last_start
);
3038 /* now for the fun voodoo */
3040 if (ext2fs_has_feature_flex_bg(fs
->super
) &&
3041 (grp
& ~(flexbg_size
- 1)) == 0)
3042 grp
= grp
& ~(flexbg_size
- 1);
3044 for (; grp
< flex_groups
; grp
++)
3045 overhead
+= calc_group_overhead(fs
, grp
, old_desc_blocks
);
3047 #ifdef RESIZE2FS_DEBUG
3048 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3049 printf("Last group's overhead is %llu\n", overhead
);
3053 * if this is the case then the last group is going to have data in it
3054 * so we need to adjust the size of the last group accordingly
3056 if (last_start
< blks_needed
) {
3057 blk64_t remainder
= blks_needed
- last_start
;
3059 #ifdef RESIZE2FS_DEBUG
3060 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3061 printf("Need %llu data blocks in last group\n",
3065 * 50 is a magic number that mkfs/resize uses to see if its
3066 * even worth making/resizing the fs. basically you need to
3067 * have at least 50 blocks in addition to the blocks needed
3068 * for the metadata in the last group
3071 overhead
+= remainder
;
3077 overhead
+= fs
->super
->s_first_data_block
;
3078 #ifdef RESIZE2FS_DEBUG
3079 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3080 printf("Final size of last group is %lld\n", overhead
);
3083 /* Add extra slack for bigalloc file systems */
3084 if (EXT2FS_CLUSTER_RATIO(fs
) > 1)
3085 overhead
+= EXT2FS_CLUSTER_RATIO(fs
) * 2;
3088 * since our last group doesn't have to be BLOCKS_PER_GROUP
3089 * large, we only do groups-1, and then add the number of
3090 * blocks needed to handle the group descriptor metadata+data
3093 blks_needed
= EXT2_GROUPS_TO_BLOCKS(fs
->super
, groups
- 1);
3094 blks_needed
+= overhead
;
3097 * Make sure blks_needed covers the end of the inode table in
3098 * the last block group.
3100 overhead
= ext2fs_inode_table_loc(fs
, groups
-1) +
3101 fs
->inode_blocks_per_group
;
3102 if (blks_needed
< overhead
)
3103 blks_needed
= overhead
;
3105 #ifdef RESIZE2FS_DEBUG
3106 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3107 printf("Estimated blocks needed: %llu\n", blks_needed
);
3111 * If at this point we've already added up more "needed" than
3112 * the current size, just return current size as minimum.
3114 if (blks_needed
>= ext2fs_blocks_count(fs
->super
))
3115 return ext2fs_blocks_count(fs
->super
);
3117 * We need to reserve a few extra blocks if extents are
3118 * enabled, in case we need to grow the extent tree. The more
3119 * we shrink the file system, the more space we need.
3121 * The absolute worst case is every single data block is in
3122 * the part of the file system that needs to be evacuated,
3123 * with each data block needs to be in its own extent, and
3124 * with each inode needing at least one extent block.
3126 if (ext2fs_has_feature_extents(fs
->super
)) {
3127 blk64_t safe_margin
= (ext2fs_blocks_count(fs
->super
) -
3129 unsigned int exts_per_blk
= (fs
->blocksize
/
3130 sizeof(struct ext3_extent
)) - 1;
3131 blk64_t worst_case
= ((data_needed
+ exts_per_blk
- 1) /
3134 if (worst_case
< inode_count
)
3135 worst_case
= inode_count
;
3137 if (safe_margin
> worst_case
)
3138 safe_margin
= worst_case
;
3140 #ifdef RESIZE2FS_DEBUG
3141 if (flags
& RESIZE_DEBUG_MIN_CALC
)
3142 printf("Extents safety margin: %llu\n", safe_margin
);
3144 blks_needed
+= safe_margin
;