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resize2fs, libext2fs: fix bugs in sparse_super2 support
[thirdparty/e2fsprogs.git] / resize / resize2fs.c
CommitLineData
24b2c7a7
TT		 1/*
2 * resize2fs.c --- ext2 main routine
3 *
0cee8a5c
TT		 4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
5 * PowerQuest, Inc.
6 *
7 * Copyright (C) 1999, 2000 by Theosore Ts'o
efc6f628 8 *
24b2c7a7 9 * %Begin-Header%
0cee8a5c
TT		 10 * This file may be redistributed under the terms of the GNU Public
11 * License.
24b2c7a7
TT		 12 * %End-Header%
13 */
14
05e112a1
TT		 15/*
16 * Resizing a filesystem consists of the following phases:
17 *
a8519a2d 18 * 1. Adjust superblock and write out new parts of the inode
05e112a1 19 * table
a8519a2d
TT		 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
28 * new ones.
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.
05e112a1 34 */
a8519a2d 35
d1154eb4 36#include "config.h"
24b2c7a7 37#include "resize2fs.h"
b969b1b8 38#include <time.h>
24b2c7a7 39
546a1ff1 40#ifdef __linux__ /* Kludge for debugging */
a8519a2d
TT		 41#define RESIZE2FS_DEBUG
42#endif
43
86acdebd 44static void fix_uninit_block_bitmaps(ext2_filsys fs);
8728d506 45static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size);
a8519a2d
TT		 46static errcode_t blocks_to_move(ext2_resize_t rfs);
47static errcode_t block_mover(ext2_resize_t rfs);
48static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
49static errcode_t inode_ref_fix(ext2_resize_t rfs);
50static errcode_t move_itables(ext2_resize_t rfs);
9213a93b 51static errcode_t fix_resize_inode(ext2_filsys fs);
a8519a2d 52static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
8a6ede8b 53static errcode_t fix_sb_journal_backup(ext2_filsys fs);
f026f1a3
TT		 54static errcode_t mark_table_blocks(ext2_filsys fs,
55 ext2fs_block_bitmap bmap);
65c6c3e0
TT		 56static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs);
57static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
58 ext2fs_block_bitmap meta_bmap);
fe12931f
DW		 59static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size);
60static errcode_t move_bg_metadata(ext2_resize_t rfs);
61static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs);
a8519a2d
TT		 62
63/*
539d3ae3 64 * Some helper functions to check if a block is in a metadata area
a8519a2d 65 */
539d3ae3
AD		 66static inline int is_block_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
67{
68 return blk == ext2fs_block_bitmap_loc(fs, grp);
69}
a8519a2d 70
539d3ae3
AD		 71static inline int is_inode_bm(ext2_filsys fs, unsigned int grp, blk64_t blk)
72{
73 return blk == ext2fs_inode_bitmap_loc(fs, grp);
74}
75
76static inline int is_inode_tb(ext2_filsys fs, unsigned int grp, blk64_t blk)
77{
78 return blk >= ext2fs_inode_table_loc(fs, grp) &&
79 blk < (ext2fs_inode_table_loc(fs, grp) +
80 fs->inode_blocks_per_group);
81}
a8519a2d 82
1773c87c
TT		 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))
91
f404167d 92static int lazy_itable_init;
a8519a2d
TT		 93
94/*
95 * This is the top-level routine which does the dirty deed....
96 */
8728d506 97errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
3346084b 98 errcode_t (*progress)(ext2_resize_t rfs, int pass,
86acdebd
TT		 99 unsigned long cur,
100 unsigned long max_val))
a8519a2d
TT		 101{
102 ext2_resize_t rfs;
103 errcode_t retval;
1eb31c48 104 struct resource_track rtrack, overall_track;
96cdb37e 105
a8519a2d
TT		 106 /*
107 * Create the data structure
108 */
c4e3d3f3 109 retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
a8519a2d
TT		 110 if (retval)
111 return retval;
a8519a2d 112
1eb31c48 113 memset(rfs, 0, sizeof(struct ext2_resize_struct));
7f9c96ee 114 fs->priv_data = rfs;
a8519a2d
TT		 115 rfs->old_fs = fs;
116 rfs->flags = flags;
117 rfs->itable_buf = 0;
118 rfs->progress = progress;
1eb31c48
TT		 119
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);
123 if (retval)
124 goto errout;
125 print_resource_track(rfs, &rtrack, fs->io);
126
127 fs->super->s_state |= EXT2_ERROR_FS;
128 ext2fs_mark_super_dirty(fs);
129 ext2fs_flush(fs);
130
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);
a8519a2d
TT		 134 retval = ext2fs_dup_handle(fs, &rfs->new_fs);
135 if (retval)
136 goto errout;
137
fe12931f
DW		 138 init_resource_track(&rtrack, "resize_group_descriptors", fs->io);
139 retval = resize_group_descriptors(rfs, *new_size);
140 if (retval)
141 goto errout;
142 print_resource_track(rfs, &rtrack, fs->io);
143
144 init_resource_track(&rtrack, "move_bg_metadata", fs->io);
145 retval = move_bg_metadata(rfs);
146 if (retval)
147 goto errout;
148 print_resource_track(rfs, &rtrack, fs->io);
149
150 init_resource_track(&rtrack, "zero_high_bits_in_metadata", fs->io);
151 retval = zero_high_bits_in_inodes(rfs);
152 if (retval)
153 goto errout;
154 print_resource_track(rfs, &rtrack, fs->io);
155
1eb31c48 156 init_resource_track(&rtrack, "adjust_superblock", fs->io);
116db1b5 157 retval = adjust_superblock(rfs, *new_size);
a8519a2d
TT		 158 if (retval)
159 goto errout;
1eb31c48 160 print_resource_track(rfs, &rtrack, fs->io);
a8519a2d 161
1eb31c48 162 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
86acdebd 163 fix_uninit_block_bitmaps(rfs->new_fs);
1eb31c48 164 print_resource_track(rfs, &rtrack, fs->io);
86acdebd 165 /* Clear the block bitmap uninit flag for the last block group */
e633b58a 166 ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
732c8cd5 167 EXT2_BG_BLOCK_UNINIT);
86acdebd 168
4efbac6f 169 *new_size = ext2fs_blocks_count(rfs->new_fs->super);
116db1b5 170
1eb31c48 171 init_resource_track(&rtrack, "blocks_to_move", fs->io);
a8519a2d
TT		 172 retval = blocks_to_move(rfs);
173 if (retval)
174 goto errout;
1eb31c48 175 print_resource_track(rfs, &rtrack, fs->io);
a8519a2d
TT		 176
177#ifdef RESIZE2FS_DEBUG
178 if (rfs->flags & RESIZE_DEBUG_BMOVE)
8728d506 179 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
4efbac6f
VAH		 180 ext2fs_free_blocks_count(rfs->old_fs->super),
181 ext2fs_free_blocks_count(rfs->new_fs->super),
a8519a2d
TT		 182 rfs->needed_blocks);
183#endif
efc6f628 184
1eb31c48 185 init_resource_track(&rtrack, "block_mover", fs->io);
a8519a2d
TT		 186 retval = block_mover(rfs);
187 if (retval)
188 goto errout;
1eb31c48 189 print_resource_track(rfs, &rtrack, fs->io);
a8519a2d 190
1eb31c48 191 init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
a8519a2d
TT		 192 retval = inode_scan_and_fix(rfs);
193 if (retval)
194 goto errout;
1eb31c48 195 print_resource_track(rfs, &rtrack, fs->io);
a8519a2d 196
1eb31c48 197 init_resource_track(&rtrack, "inode_ref_fix", fs->io);
a8519a2d
TT		 198 retval = inode_ref_fix(rfs);
199 if (retval)
200 goto errout;
1eb31c48 201 print_resource_track(rfs, &rtrack, fs->io);
a8519a2d 202
1eb31c48 203 init_resource_track(&rtrack, "move_itables", fs->io);
a8519a2d
TT		 204 retval = move_itables(rfs);
205 if (retval)
206 goto errout;
1eb31c48 207 print_resource_track(rfs, &rtrack, fs->io);
a8519a2d 208
aaa1ae08
TT		 209 retval = clear_sparse_super2_last_group(rfs);
210 if (retval)
211 goto errout;
212
1eb31c48 213 init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
64ad98ac
TT		 214 retval = ext2fs_calculate_summary_stats(rfs->new_fs);
215 if (retval)
216 goto errout;
1eb31c48 217 print_resource_track(rfs, &rtrack, fs->io);
efc6f628 218
1eb31c48 219 init_resource_track(&rtrack, "fix_resize_inode", fs->io);
9213a93b
TT		 220 retval = fix_resize_inode(rfs->new_fs);
221 if (retval)
222 goto errout;
1eb31c48 223 print_resource_track(rfs, &rtrack, fs->io);
9213a93b 224
1eb31c48 225 init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
8a6ede8b
ES		 226 retval = fix_sb_journal_backup(rfs->new_fs);
227 if (retval)
228 goto errout;
1eb31c48 229 print_resource_track(rfs, &rtrack, fs->io);
8a6ede8b 230
1862ef72
DW		 231 retval = ext2fs_set_gdt_csum(rfs->new_fs);
232 if (retval)
233 goto errout;
234
96cdb37e 235 rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
efc6f628 236 rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
1eb31c48
TT		 237
238 print_resource_track(rfs, &overall_track, fs->io);
47fee2ef 239 retval = ext2fs_close_free(&rfs->new_fs);
a8519a2d
TT		 240 if (retval)
241 goto errout;
242
243 rfs->flags = flags;
efc6f628 244
a8519a2d 245 ext2fs_free(rfs->old_fs);
585bca68 246 rfs->old_fs = NULL;
a8519a2d 247 if (rfs->itable_buf)
c4e3d3f3 248 ext2fs_free_mem(&rfs->itable_buf);
e2ca097f
TT		 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);
c4e3d3f3 253 ext2fs_free_mem(&rfs);
efc6f628 254
a8519a2d
TT		 255 return 0;
256
257errout:
585bca68 258 if (rfs->new_fs) {
a8519a2d 259 ext2fs_free(rfs->new_fs);
585bca68
LC		 260 rfs->new_fs = NULL;
261 }
a8519a2d 262 if (rfs->itable_buf)
c4e3d3f3
TT		 263 ext2fs_free_mem(&rfs->itable_buf);
264 ext2fs_free_mem(&rfs);
a8519a2d
TT		 265 return retval;
266}
267
fe12931f
DW		 268/* Keep the size of the group descriptor region constant */
269static void adjust_reserved_gdt_blocks(ext2_filsys old_fs, ext2_filsys fs)
270{
21e37be6 271 if (ext2fs_has_feature_resize_inode(fs->super) &&
fe12931f
DW		 272 (old_fs->desc_blocks != fs->desc_blocks)) {
273 int new;
274
275 new = ((int) fs->super->s_reserved_gdt_blocks) +
276 (old_fs->desc_blocks - fs->desc_blocks);
277 if (new < 0)
278 new = 0;
279 if (new > (int) fs->blocksize/4)
280 new = fs->blocksize/4;
281 fs->super->s_reserved_gdt_blocks = new;
282 }
283}
284
285/* Toggle 64bit mode */
286static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size)
287{
288 void *o, *n, *new_group_desc;
289 dgrp_t i;
290 int copy_size;
291 errcode_t retval;
292
293 if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
294 return 0;
295
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;
301
302 if (rfs->flags & RESIZE_DISABLE_64BIT) {
21e37be6 303 ext2fs_clear_feature_64bit(rfs->new_fs->super);
fe12931f
DW		 304 rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE;
305 } else if (rfs->flags & RESIZE_ENABLE_64BIT) {
21e37be6 306 ext2fs_set_feature_64bit(rfs->new_fs->super);
fe12931f
DW		 307 rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
308 }
309
310 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
311 EXT2_DESC_SIZE(rfs->new_fs->super))
312 return 0;
313
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);
320 if (retval)
321 return retval;
322
323 n = new_group_desc;
324
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);
328 else
329 copy_size = EXT2_DESC_SIZE(rfs->new_fs->super);
330 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
331 memcpy(n, o, copy_size);
332 n += EXT2_DESC_SIZE(rfs->new_fs->super);
333 o += EXT2_DESC_SIZE(rfs->old_fs->super);
334 }
335
336 ext2fs_free_mem(&rfs->new_fs->group_desc);
337 rfs->new_fs->group_desc = new_group_desc;
338
339 for (i = 0; i < rfs->old_fs->group_desc_count; i++)
340 ext2fs_group_desc_csum_set(rfs->new_fs, i);
341
342 adjust_reserved_gdt_blocks(rfs->old_fs, rfs->new_fs);
343
344 return 0;
345}
346
347/* Move bitmaps/inode tables out of the way. */
348static errcode_t move_bg_metadata(ext2_resize_t rfs)
349{
350 dgrp_t i;
351 blk64_t b, c, d, old_desc_blocks, new_desc_blocks, j;
352 ext2fs_block_bitmap old_map, new_map;
353 int old, new;
354 errcode_t retval;
355 int cluster_ratio;
356
357 if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
358 return 0;
359
360 retval = ext2fs_allocate_block_bitmap(rfs->old_fs, "oldfs", &old_map);
361 if (retval)
362 return retval;
363
364 retval = ext2fs_allocate_block_bitmap(rfs->new_fs, "newfs", &new_map);
365 if (retval)
366 goto out;
367
21e37be6 368 if (ext2fs_has_feature_meta_bg(rfs->old_fs->super)) {
fe12931f
DW		 369 old_desc_blocks = rfs->old_fs->super->s_first_meta_bg;
370 new_desc_blocks = rfs->new_fs->super->s_first_meta_bg;
371 } else {
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;
376 }
377
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,
381 NULL);
382 if (retval)
383 goto out;
384 if (b)
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);
388 if (d)
389 ext2fs_mark_block_bitmap2(old_map, d);
390
391 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, i, &b, &c, &d,
392 NULL);
393 if (retval)
394 goto out;
395 if (b)
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);
399 if (d)
400 ext2fs_mark_block_bitmap2(new_map, d);
401 }
402
403 cluster_ratio = EXT2FS_CLUSTER_RATIO(rfs->new_fs);
404
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);
412
413 if (old && !new) {
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 */
420 else {
421 ext2fs_unmark_block_bitmap2(old_map, b);
422 ext2fs_unmark_block_bitmap2(new_map, b);
423 }
424 }
425
426 /*
427 * new_map now shows blocks that have been newly allocated.
428 * old_map now shows blocks that have been newly freed.
429 */
430
431 /*
432 * Move any conflicting bitmaps and inode tables. Ensure that we
433 * don't try to free clusters associated with bitmaps or tables.
434 */
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);
441
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);
447
448 c = ext2fs_inode_table_loc(rfs->new_fs, i);
449 for (b = 0;
450 b < rfs->new_fs->inode_blocks_per_group;
451 b++) {
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);
456 }
457 }
458
459 /* Free unused clusters */
460 for (b = 0;
461 cluster_ratio > 1 && b < ext2fs_blocks_count(rfs->new_fs->super);
462 b += cluster_ratio)
463 if (ext2fs_test_block_bitmap2(old_map, b))
464 ext2fs_unmark_block_bitmap2(rfs->new_fs->block_map, b);
465out:
466 if (old_map)
467 ext2fs_free_block_bitmap(old_map);
468 if (new_map)
469 ext2fs_free_block_bitmap(new_map);
470 return retval;
471}
472
473/* Zero out the high bits of extent fields */
474static errcode_t zero_high_bits_in_extents(ext2_filsys fs, ext2_ino_t ino,
475 struct ext2_inode *inode)
476{
477 ext2_extent_handle_t handle;
478 struct ext2fs_extent extent;
479 int op = EXT2_EXTENT_ROOT;
480 errcode_t errcode;
481
482 if (!(inode->i_flags & EXT4_EXTENTS_FL))
483 return 0;
484
485 errcode = ext2fs_extent_open(fs, ino, &handle);
486 if (errcode)
487 return errcode;
488
489 while (1) {
490 errcode = ext2fs_extent_get(handle, op, &extent);
491 if (errcode)
492 break;
493
494 op = EXT2_EXTENT_NEXT_SIB;
495
496 if (extent.e_pblk > (1ULL << 32)) {
497 extent.e_pblk &= (1ULL << 32) - 1;
498 errcode = ext2fs_extent_replace(handle, 0, &extent);
499 if (errcode)
500 break;
501 }
502 }
503
504 /* Ok if we run off the end */
505 if (errcode == EXT2_ET_EXTENT_NO_NEXT)
506 errcode = 0;
507 ext2fs_extent_free(handle);
508 return errcode;
509}
510
511/* Zero out the high bits of inodes. */
512static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs)
513{
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;
518 errcode_t retval;
519 ext2_ino_t ino;
520
521 if (!(rfs->flags & (RESIZE_DISABLE_64BIT | RESIZE_ENABLE_64BIT)))
522 return 0;
523
524 if (fs->super->s_creator_os != EXT2_OS_LINUX)
525 return 0;
526
527 retval = ext2fs_open_inode_scan(fs, 0, &scan);
528 if (retval)
529 return retval;
530
531 retval = ext2fs_get_mem(length, &inode);
532 if (retval)
533 goto out;
534
535 do {
536 retval = ext2fs_get_next_inode_full(scan, &ino, inode, length);
537 if (retval)
538 goto out;
539 if (!ino)
540 break;
541 if (!ext2fs_test_inode_bitmap2(fs->inode_map, ino))
542 continue;
543
544 /*
545 * Here's how we deal with high block number fields:
546 *
547 * - i_size_high has been been written out with i_size_lo
548 * since the ext2 days, so no conversion is needed.
549 *
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.
555 *
556 * - i_file_acl_high can be uninitialized, so zero it if
557 * it isn't already.
558 */
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,
562 length);
563 if (retval)
564 goto out;
565 }
566
567 retval = zero_high_bits_in_extents(fs, ino, inode);
568 if (retval)
569 goto out;
570 } while (ino);
571
572out:
573 if (inode)
574 ext2fs_free_mem(&inode);
575 if (scan)
576 ext2fs_close_inode_scan(scan);
577 return retval;
578}
579
86acdebd
TT		 580/*
581 * Clean up the bitmaps for unitialized bitmaps
582 */
583static void fix_uninit_block_bitmaps(ext2_filsys fs)
584{
a0ba54ec 585 blk64_t blk, lblk;
86acdebd 586 dgrp_t g;
a0ba54ec 587 int i;
86acdebd 588
5b58dc23 589 if (!ext2fs_has_group_desc_csum(fs))
86acdebd
TT		 590 return;
591
592 for (g=0; g < fs->group_desc_count; g++) {
cd65a24e 593 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
86acdebd
TT		 594 continue;
595
5d3a88fb 596 blk = ext2fs_group_first_block2(fs, g);
a0ba54ec
TT		 597 lblk = ext2fs_group_last_block2(fs, g);
598 ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
599 lblk - blk + 1);
600
601 ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
602 ext2fs_mark_block_bitmap2(fs->block_map,
603 ext2fs_block_bitmap_loc(fs, g));
604 ext2fs_mark_block_bitmap2(fs->block_map,
605 ext2fs_inode_bitmap_loc(fs, g));
606 for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
607 i < (unsigned int) fs->inode_blocks_per_group;
608 i++, blk++)
609 ext2fs_mark_block_bitmap2(fs->block_map, blk);
86acdebd
TT		 610 }
611}
612
a8519a2d
TT		 613/* --------------------------------------------------------------------
614 *
615 * Resize processing, phase 1.
616 *
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 * --------------------------------------------------------------------
622 */
623
9227c5bb
TT		 624/*
625 * If the group descriptor's bitmap and inode table blocks are valid,
c09043f1
TT		 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.
9227c5bb 628 */
01d6aa9d
DW		 629static errcode_t free_gdp_blocks(ext2_filsys fs,
630 ext2fs_block_bitmap reserve_blocks,
631 ext2_filsys old_fs,
632 dgrp_t group)
9227c5bb 633{
0851517d 634 blk64_t blk;
9227c5bb 635 int j;
01d6aa9d
DW		 636 dgrp_t i;
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;
640
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);
644 if (retval)
645 goto out;
9227c5bb 646
01d6aa9d
DW		 647 retval = mark_table_blocks(fs, bg_map);
648 if (retval)
649 goto out;
c09043f1 650 }
9227c5bb 651
01d6aa9d
DW		 652 for (i = group; i < group + count; i++) {
653 blk = ext2fs_block_bitmap_loc(old_fs, i);
654 if (blk &&
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);
659 }
9227c5bb 660
01d6aa9d
DW		 661 blk = ext2fs_inode_bitmap_loc(old_fs, i);
662 if (blk &&
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);
667 }
9227c5bb 668
01d6aa9d
DW		 669 blk = ext2fs_inode_table_loc(old_fs, i);
670 for (j = 0;
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)))
674 continue;
675 ext2fs_block_alloc_stats2(fs, blk, -1);
676 ext2fs_mark_block_bitmap2(reserve_blocks, blk);
677 }
9227c5bb 678 }
01d6aa9d
DW		 679
680out:
681 if (bg_map)
682 ext2fs_free_block_bitmap(bg_map);
683 return retval;
9227c5bb
TT		 684}
685
24b2c7a7 686/*
bf69235a
TT		 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.
24b2c7a7 689 */
c09043f1 690errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
8728d506 691 ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
24b2c7a7 692{
24b2c7a7 693 errcode_t retval;
8728d506
VAH		 694 blk64_t overhead = 0;
695 blk64_t rem;
696 blk64_t blk, group_block;
2696f250 697 blk64_t real_end;
5e27a274
TT		 698 blk64_t old_numblocks, numblocks, adjblocks;
699 unsigned long i, j, old_desc_blocks;
54434927 700 unsigned int meta_bg, meta_bg_size;
aaa1ae08 701 int has_super, csum_flag, has_bg;
de8f3a76 702 unsigned long long new_inodes; /* u64 to check for overflow */
9ff8ece5 703 double percent;
bf69235a 704
4efbac6f 705 ext2fs_blocks_count_set(fs->super, new_size);
24b2c7a7
TT		 706
707retry:
4efbac6f 708 fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
69022e02
TT		 709 fs->super->s_first_data_block,
710 EXT2_BLOCKS_PER_GROUP(fs->super));
24b2c7a7
TT		 711 if (fs->group_desc_count == 0)
712 return EXT2_ET_TOOSMALL;
efc6f628 713 fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
69022e02 714 EXT2_DESC_PER_BLOCK(fs->super));
24b2c7a7
TT		 715
716 /*
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
720 * table.
24b2c7a7 721 */
9213a93b
TT		 722 overhead = (int) (2 + fs->inode_blocks_per_group);
723
aaa1ae08
TT		 724 has_bg = 0;
725 if (ext2fs_has_feature_sparse_super2(fs->super)) {
726 /*
727 * We have to do this manually since
728 * super->s_backup_bgs hasn't been set up yet.
729 */
730 if (fs->group_desc_count == 2)
731 has_bg = fs->super->s_backup_bgs[0] != 0;
732 else
733 has_bg = fs->super->s_backup_bgs[1] != 0;
734 } else
735 has_bg = ext2fs_bg_has_super(fs, fs->group_desc_count - 1);
736 if (has_bg)
efc6f628 737 overhead += 1 + fs->desc_blocks +
9213a93b
TT		 738 fs->super->s_reserved_gdt_blocks;
739
24b2c7a7
TT		 740 /*
741 * See if the last group is big enough to support the
742 * necessary data structures. If not, we need to get rid of
743 * it.
744 */
4efbac6f 745 rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
24b2c7a7
TT		 746 fs->super->s_blocks_per_group;
747 if ((fs->group_desc_count == 1) && rem && (rem < overhead))
748 return EXT2_ET_TOOSMALL;
515e555a 749 if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
4efbac6f
VAH		 750 ext2fs_blocks_count_set(fs->super,
751 ext2fs_blocks_count(fs->super) - rem);
24b2c7a7
TT		 752 goto retry;
753 }
754 /*
755 * Adjust the number of inodes
756 */
de8f3a76 757 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
f3358643
ES		 758 if (new_inodes > ~0U) {
759 fprintf(stderr, _("inodes (%llu) must be less than %u"),
760 new_inodes, ~0U);
761 return EXT2_ET_TOO_MANY_INODES;
762 }
24b2c7a7
TT		 763 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
764 fs->group_desc_count;
765
766 /*
767 * Adjust the number of free blocks
768 */
4efbac6f
VAH		 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)));
24b2c7a7 774 else
4efbac6f
VAH		 775 ext2fs_free_blocks_count_set(fs->super,
776 ext2fs_free_blocks_count(fs->super) +
777 (ext2fs_blocks_count(fs->super) - blk));
24b2c7a7 778
c762c8e6
TT		 779 /*
780 * Adjust the number of reserved blocks
781 */
4efbac6f
VAH		 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) /
786 100.0));
c762c8e6 787
24b2c7a7
TT		 788 /*
789 * Adjust the bitmaps for size
790 */
3346084b 791 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
24b2c7a7
TT		 792 fs->super->s_inodes_count,
793 fs->inode_map);
c762c8e6 794 if (retval) goto errout;
efc6f628 795
1e33a8b4 796 real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
2696f250 797 fs->super->s_first_data_block;
f026f1a3
TT		 798 retval = ext2fs_resize_block_bitmap2(new_size - 1,
799 real_end, fs->block_map);
c762c8e6 800 if (retval) goto errout;
24b2c7a7 801
f026f1a3
TT		 802 /*
803 * If we are growing the file system, also grow the size of
804 * the reserve_blocks bitmap
805 */
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;
810 }
811
24b2c7a7
TT		 812 /*
813 * Reallocate the group descriptors as necessary.
814 */
fe12931f
DW		 815 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
816 old_fs->desc_blocks != fs->desc_blocks) {
bf69235a 817 retval = ext2fs_resize_mem(old_fs->desc_blocks *
76f875da
TT		 818 fs->blocksize,
819 fs->desc_blocks * fs->blocksize,
c4e3d3f3 820 &fs->group_desc);
ca8abba7 821 if (retval)
a8519a2d 822 goto errout;
efc6f628
TT		 823 if (fs->desc_blocks > old_fs->desc_blocks)
824 memset((char *) fs->group_desc +
bf69235a
TT		 825 (old_fs->desc_blocks * fs->blocksize), 0,
826 (fs->desc_blocks - old_fs->desc_blocks) *
2787276e 827 fs->blocksize);
24b2c7a7 828 }
1e1da29f 829
9213a93b
TT		 830 /*
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.
fe12931f
DW		 835 *
836 * Note: If we're converting to 64bit mode, we did this earlier.
9213a93b 837 */
fe12931f
DW		 838 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
839 adjust_reserved_gdt_blocks(old_fs, fs);
9213a93b 840
21e37be6 841 if (ext2fs_has_feature_meta_bg(fs->super) &&
c82815e5 842 (fs->super->s_first_meta_bg > fs->desc_blocks)) {
21e37be6 843 ext2fs_clear_feature_meta_bg(fs->super);
c82815e5
TT		 844 fs->super->s_first_meta_bg = 0;
845 }
846
65c6c3e0
TT		 847 /*
848 * Update the location of the backup superblocks if the
849 * sparse_super2 feature is enabled.
850 */
21e37be6 851 if (ext2fs_has_feature_sparse_super2(fs->super)) {
65c6c3e0
TT		 852 dgrp_t last_bg = fs->group_desc_count - 1;
853 dgrp_t old_last_bg = old_fs->group_desc_count - 1;
854
855 if (last_bg > old_last_bg) {
856 if (old_fs->group_desc_count == 1)
857 fs->super->s_backup_bgs[0] = 1;
aaa1ae08
TT		 858 if ((old_fs->group_desc_count < 3 &&
859 fs->group_desc_count > 2) ||
860 fs->super->s_backup_bgs[1])
65c6c3e0
TT		 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;
867 if (last_bg > 1 &&
868 old_fs->super->s_backup_bgs[1] == old_last_bg)
869 fs->super->s_backup_bgs[1] = last_bg;
870 }
871 }
872
a8519a2d 873 /*
c09043f1
TT		 874 * If we are shrinking the number of block groups, we're done
875 * and can exit now.
1e1da29f 876 */
bf69235a 877 if (old_fs->group_desc_count > fs->group_desc_count) {
9227c5bb
TT		 878 /*
879 * Check the block groups that we are chopping off
880 * and free any blocks associated with their metadata
881 */
01d6aa9d
DW		 882 retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
883 fs->group_desc_count);
c762c8e6
TT		 884 goto errout;
885 }
bf69235a 886
a8519a2d
TT		 887 /*
888 * Fix the count of the last (old) block group
889 */
4efbac6f 890 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
bf69235a
TT		 891 old_fs->super->s_first_data_block) %
892 old_fs->super->s_blocks_per_group;
1e1da29f 893 if (!old_numblocks)
bf69235a
TT		 894 old_numblocks = old_fs->super->s_blocks_per_group;
895 if (old_fs->group_desc_count == fs->group_desc_count) {
4efbac6f 896 numblocks = (ext2fs_blocks_count(fs->super) -
bf69235a
TT		 897 fs->super->s_first_data_block) %
898 fs->super->s_blocks_per_group;
1e1da29f 899 if (!numblocks)
bf69235a 900 numblocks = fs->super->s_blocks_per_group;
1e1da29f 901 } else
bf69235a
TT		 902 numblocks = fs->super->s_blocks_per_group;
903 i = old_fs->group_desc_count - 1;
d7cca6b0 904 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
236efede
JS		 905 ext2fs_group_desc_csum_set(fs, i);
906
1e1da29f 907 /*
a8519a2d
TT		 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.)
1e1da29f 911 */
bf69235a 912 if (old_fs->group_desc_count >= fs->group_desc_count) {
c762c8e6
TT		 913 retval = 0;
914 goto errout;
915 }
bf69235a 916
a8519a2d
TT		 917 /*
918 * Initialize the new block group descriptors
919 */
027b0577
TT		 920 group_block = ext2fs_group_first_block2(fs,
921 old_fs->group_desc_count);
5b58dc23 922 csum_flag = ext2fs_has_group_desc_csum(fs);
f21c30d9
DW		 923 if (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
924 access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0)
2d8c0c8a 925 lazy_itable_init = 1;
21e37be6 926 if (ext2fs_has_feature_meta_bg(fs->super))
76dd5e5c
TT		 927 old_desc_blocks = fs->super->s_first_meta_bg;
928 else
efc6f628 929 old_desc_blocks = fs->desc_blocks +
9213a93b 930 fs->super->s_reserved_gdt_blocks;
f026f1a3
TT		 931
932 /*
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.
936 */
937 for (i = 0; i < old_fs->group_desc_count; i++)
938 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
939
bf69235a 940 for (i = old_fs->group_desc_count;
1e1da29f 941 i < fs->group_desc_count; i++) {
d7cca6b0 942 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
1e1da29f
TT		 943 sizeof(struct ext2_group_desc));
944 adjblocks = 0;
945
e633b58a 946 ext2fs_bg_flags_zap(fs, i);
2d8c0c8a
TT		 947 if (csum_flag) {
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);
954 }
98f45471
ES		 955
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);
1e1da29f 959
76dd5e5c
TT		 960 has_super = ext2fs_bg_has_super(fs, i);
961 if (has_super) {
48f23054 962 ext2fs_block_alloc_stats2(fs, group_block, +1);
76dd5e5c
TT		 963 adjblocks++;
964 }
f2de1d38 965 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
76dd5e5c 966 meta_bg = i / meta_bg_size;
21e37be6 967 if (!ext2fs_has_feature_meta_bg(fs->super) ||
76dd5e5c
TT		 968 (meta_bg < fs->super->s_first_meta_bg)) {
969 if (has_super) {
970 for (j=0; j < old_desc_blocks; j++)
48f23054 971 ext2fs_block_alloc_stats2(fs,
74128f8d 972 group_block + 1 + j, +1);
76dd5e5c
TT		 973 adjblocks += old_desc_blocks;
974 }
975 } else {
976 if (has_super)
977 has_super = 1;
978 if (((i % meta_bg_size) == 0) ||
979 ((i % meta_bg_size) == 1) ||
980 ((i % meta_bg_size) == (meta_bg_size-1)))
48f23054 981 ext2fs_block_alloc_stats2(fs,
74128f8d 982 group_block + has_super, +1);
24b2c7a7 983 }
efc6f628 984
1e1da29f 985 adjblocks += 2 + fs->inode_blocks_per_group;
efc6f628 986
1e1da29f 987 numblocks -= adjblocks;
4efbac6f
VAH		 988 ext2fs_free_blocks_count_set(fs->super,
989 ext2fs_free_blocks_count(fs->super) - adjblocks);
1e1da29f
TT		 990 fs->super->s_free_inodes_count +=
991 fs->super->s_inodes_per_group;
d7cca6b0
VAH		 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);
236efede 996 ext2fs_group_desc_csum_set(fs, i);
24b2c7a7 997
1e1da29f 998 retval = ext2fs_allocate_group_table(fs, i, 0);
c762c8e6 999 if (retval) goto errout;
24b2c7a7 1000
bf69235a
TT		 1001 group_block += fs->super->s_blocks_per_group;
1002 }
1003 retval = 0;
1004
f026f1a3
TT		 1005 /*
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.
1012 */
1013 if (reserve_blocks)
1014 mark_table_blocks(fs, reserve_blocks);
1015
bf69235a
TT		 1016errout:
1017 return (retval);
1018}
1019
1020/*
1021 * This routine adjusts the superblock and other data structures, both
1022 * in disk as well as in memory...
1023 */
8728d506 1024static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
bf69235a 1025{
65c6c3e0 1026 ext2_filsys fs = rfs->new_fs;
bf69235a
TT		 1027 int adj = 0;
1028 errcode_t retval;
8728d506 1029 blk64_t group_block;
bf69235a
TT		 1030 unsigned long i;
1031 unsigned long max_group;
efc6f628 1032
bf69235a
TT		 1033 ext2fs_mark_super_dirty(fs);
1034 ext2fs_mark_bb_dirty(fs);
1035 ext2fs_mark_ib_dirty(fs);
1036
c09043f1
TT		 1037 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
1038 &rfs->reserve_blocks);
1039 if (retval)
1040 return retval;
1041
1042 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
bf69235a
TT		 1043 if (retval)
1044 goto errout;
1045
1046 /*
1047 * Check to make sure there are enough inodes
1048 */
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) {
1052 retval = ENOSPC;
1053 goto errout;
1054 }
1055
1056 /*
1057 * If we are shrinking the number block groups, we're done and
1058 * can exit now.
1059 */
1060 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
1061 retval = 0;
1062 goto errout;
1063 }
1064
1065 /*
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.)
1069 */
1070 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
1071 retval = 0;
1072 goto errout;
1073 }
1074
1075 /*
2d8c0c8a
TT		 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.
1079 */
22cde009 1080 if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
2d8c0c8a
TT		 1081 retval = 0;
1082 goto errout;
1083 }
1084
1085 /*
1086 * Initialize the inode table
bf69235a 1087 */
e5aace90 1088 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
bf69235a
TT		 1089 &rfs->itable_buf);
1090 if (retval)
1091 goto errout;
1092
1093 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
027b0577
TT		 1094 group_block = ext2fs_group_first_block2(fs,
1095 rfs->old_fs->group_desc_count);
bf69235a
TT		 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,
1100 0, max_group);
1101 if (retval)
1102 goto errout;
1103 }
1104 for (i = rfs->old_fs->group_desc_count;
1105 i < fs->group_desc_count; i++) {
05e112a1
TT		 1106 /*
1107 * Write out the new inode table
1108 */
08c8e319
DW		 1109 retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
1110 fs->inode_blocks_per_group, NULL,
1111 NULL);
1112 if (retval)
1113 goto errout;
c762c8e6 1114
a8519a2d 1115 io_channel_flush(fs->io);
3b627e8d
TT		 1116 if (rfs->progress) {
1117 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1118 i - adj + 1, max_group);
1119 if (retval)
1120 goto errout;
1121 }
1e1da29f 1122 group_block += fs->super->s_blocks_per_group;
24b2c7a7 1123 }
c762c8e6
TT		 1124 io_channel_flush(fs->io);
1125 retval = 0;
1126
1127errout:
c762c8e6
TT		 1128 return retval;
1129}
1130
a8519a2d
TT		 1131/* --------------------------------------------------------------------
1132 *
1133 * Resize processing, phase 2.
1134 *
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
1139 * any problems.
1140 * --------------------------------------------------------------------
1141 */
1142
c762c8e6
TT		 1143/*
1144 * This helper function creates a block bitmap with all of the
1145 * filesystem meta-data blocks.
1146 */
1147static errcode_t mark_table_blocks(ext2_filsys fs,
64ad98ac 1148 ext2fs_block_bitmap bmap)
c762c8e6 1149{
54434927 1150 dgrp_t i;
f026f1a3 1151 blk64_t blk;
c762c8e6 1152
c762c8e6 1153 for (i = 0; i < fs->group_desc_count; i++) {
64ad98ac 1154 ext2fs_reserve_super_and_bgd(fs, i, bmap);
efc6f628 1155
c762c8e6
TT		 1156 /*
1157 * Mark the blocks used for the inode table
1158 */
f026f1a3
TT		 1159 blk = ext2fs_inode_table_loc(fs, i);
1160 if (blk)
1161 ext2fs_mark_block_bitmap_range2(bmap, blk,
1162 fs->inode_blocks_per_group);
efc6f628 1163
c762c8e6 1164 /*
efc6f628 1165 * Mark block used for the block bitmap
c762c8e6 1166 */
f026f1a3
TT		 1167 blk = ext2fs_block_bitmap_loc(fs, i);
1168 if (blk)
1169 ext2fs_mark_block_bitmap2(bmap, blk);
64ad98ac 1170
c762c8e6 1171 /*
efc6f628 1172 * Mark block used for the inode bitmap
c762c8e6 1173 */
f026f1a3
TT		 1174 blk = ext2fs_inode_bitmap_loc(fs, i);
1175 if (blk)
1176 ext2fs_mark_block_bitmap2(bmap, blk);
c762c8e6 1177 }
1e1da29f 1178 return 0;
24b2c7a7
TT		 1179}
1180
76dd5e5c
TT		 1181/*
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.
1185 */
1186static void mark_fs_metablock(ext2_resize_t rfs,
1187 ext2fs_block_bitmap meta_bmap,
8728d506 1188 int group, blk64_t blk)
76dd5e5c 1189{
539d3ae3 1190 ext2_filsys fs = rfs->new_fs;
efc6f628 1191
3346084b 1192 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
48f23054 1193 ext2fs_block_alloc_stats2(fs, blk, +1);
76dd5e5c
TT		 1194
1195 /*
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.
1199 */
539d3ae3 1200 if (is_block_bm(fs, group, blk)) {
d7cca6b0 1201 ext2fs_block_bitmap_loc_set(fs, group, 0);
76dd5e5c 1202 rfs->needed_blocks++;
ddcf1dbf
TT		 1203 return;
1204 }
539d3ae3 1205 if (is_inode_bm(fs, group, blk)) {
d7cca6b0 1206 ext2fs_inode_bitmap_loc_set(fs, group, 0);
76dd5e5c 1207 rfs->needed_blocks++;
ddcf1dbf
TT		 1208 return;
1209 }
539d3ae3 1210 if (is_inode_tb(fs, group, blk)) {
d7cca6b0 1211 ext2fs_inode_table_loc_set(fs, group, 0);
76dd5e5c 1212 rfs->needed_blocks++;
ddcf1dbf
TT		 1213 return;
1214 }
21e37be6 1215 if (ext2fs_has_feature_flex_bg(fs->super)) {
ddcf1dbf
TT		 1216 dgrp_t i;
1217
539d3ae3
AD		 1218 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
1219 if (is_block_bm(fs, i, blk)) {
ddcf1dbf
TT		 1220 ext2fs_block_bitmap_loc_set(fs, i, 0);
1221 rfs->needed_blocks++;
1222 return;
1223 }
539d3ae3 1224 if (is_inode_bm(fs, i, blk)) {
ddcf1dbf
TT		 1225 ext2fs_inode_bitmap_loc_set(fs, i, 0);
1226 rfs->needed_blocks++;
1227 return;
1228 }
539d3ae3 1229 if (is_inode_tb(fs, i, blk)) {
ddcf1dbf
TT		 1230 ext2fs_inode_table_loc_set(fs, i, 0);
1231 rfs->needed_blocks++;
1232 return;
1233 }
1234 }
1235 }
b9b5e43e
TT		 1236
1237 if (ext2fs_has_group_desc_csum(fs) &&
1238 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
86acdebd
TT		 1239 /*
1240 * If the block bitmap is uninitialized, which means
1241 * nothing other than standard metadata in use.
1242 */
1243 return;
3346084b
VAH		 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);
76dd5e5c
TT		 1247 rfs->needed_blocks++;
1248 }
1249}
1250
1251
24b2c7a7
TT		 1252/*
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.
1256 */
c762c8e6 1257static errcode_t blocks_to_move(ext2_resize_t rfs)
24b2c7a7 1258{
54434927 1259 int j, has_super;
86acdebd 1260 dgrp_t i, max_groups, g;
8728d506 1261 blk64_t blk, group_blk;
118d3f0b 1262 blk64_t old_blocks, new_blocks, group_end, cluster_freed;
80391dcd 1263 blk64_t new_size;
54434927 1264 unsigned int meta_bg, meta_bg_size;
24b2c7a7 1265 errcode_t retval;
c762c8e6 1266 ext2_filsys fs, old_fs;
118d3f0b 1267 ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
4b04fb30 1268 int flex_bg;
24b2c7a7 1269
c762c8e6
TT		 1270 fs = rfs->new_fs;
1271 old_fs = rfs->old_fs;
4efbac6f 1272 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
c762c8e6 1273 fs = rfs->old_fs;
efc6f628 1274
a13575f4 1275 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
c762c8e6
TT		 1276 &rfs->move_blocks);
1277 if (retval)
1278 return retval;
1279
efc6f628 1280 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
64ad98ac
TT		 1281 &meta_bmap);
1282 if (retval)
1283 return retval;
efc6f628 1284
64ad98ac 1285 retval = mark_table_blocks(old_fs, meta_bmap);
c762c8e6
TT		 1286 if (retval)
1287 return retval;
1288
1289 fs = rfs->new_fs;
efc6f628 1290
80391dcd 1291 /*
e9736a3b
TT		 1292 * If we're shrinking the filesystem, we need to move any
1293 * group's metadata blocks (either allocation bitmaps or the
1294 * inode table) which are beyond the end of the new
1295 * filesystem.
80391dcd
ES		 1296 */
1297 new_size = ext2fs_blocks_count(fs->super);
1298 if (new_size < ext2fs_blocks_count(old_fs->super)) {
1299 for (g = 0; g < fs->group_desc_count; g++) {
e9736a3b 1300 int realloc = 0;
80391dcd 1301 /*
e9736a3b
TT		 1302 * ext2fs_allocate_group_table will re-allocate any
1303 * metadata blocks whose location is set to zero.
80391dcd
ES		 1304 */
1305 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
1306 ext2fs_block_bitmap_loc_set(fs, g, 0);
e9736a3b 1307 realloc = 1;
80391dcd
ES		 1308 }
1309 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
1310 ext2fs_inode_bitmap_loc_set(fs, g, 0);
e9736a3b
TT		 1311 realloc = 1;
1312 }
1313 if ((ext2fs_inode_table_loc(fs, g) +
1314 fs->inode_blocks_per_group) > new_size) {
1315 ext2fs_inode_table_loc_set(fs, g, 0);
1316 realloc = 1;
1317 }
1318
1319 if (realloc) {
80391dcd
ES		 1320 retval = ext2fs_allocate_group_table(fs, g, 0);
1321 if (retval)
1322 return retval;
1323 }
1324 }
1325 }
1326
1e1da29f
TT		 1327 /*
1328 * If we're shrinking the filesystem, we need to move all of
1329 * the blocks that don't fit any more
1330 */
4efbac6f
VAH		 1331 for (blk = ext2fs_blocks_count(fs->super);
1332 blk < ext2fs_blocks_count(old_fs->super); blk++) {
6493f8e8 1333 g = ext2fs_group_of_blk2(fs, blk);
5b58dc23 1334 if (ext2fs_has_group_desc_csum(fs) &&
cd65a24e 1335 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
86acdebd
TT		 1336 /*
1337 * The block bitmap is uninitialized, so skip
1338 * to the next block group.
1339 */
5d3a88fb 1340 blk = ext2fs_group_first_block2(fs, g+1) - 1;
86acdebd
TT		 1341 continue;
1342 }
3346084b
VAH		 1343 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1344 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1345 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1e1da29f 1346 rfs->needed_blocks++;
c762c8e6 1347 }
3346084b 1348 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1e1da29f 1349 }
efc6f628 1350
21e37be6 1351 if (ext2fs_has_feature_meta_bg(old_fs->super))
76dd5e5c 1352 old_blocks = old_fs->super->s_first_meta_bg;
c82815e5
TT		 1353 else
1354 old_blocks = old_fs->desc_blocks +
1355 old_fs->super->s_reserved_gdt_blocks;
21e37be6 1356 if (ext2fs_has_feature_meta_bg(fs->super))
76dd5e5c 1357 new_blocks = fs->super->s_first_meta_bg;
c82815e5 1358 else
9213a93b 1359 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
efc6f628 1360
65c6c3e0
TT		 1361 retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
1362 if (retval)
1363 goto errout;
1364
fe12931f
DW		 1365 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
1366 EXT2_DESC_SIZE(rfs->new_fs->super) &&
1367 old_blocks == new_blocks) {
c762c8e6
TT		 1368 retval = 0;
1369 goto errout;
1370 }
24b2c7a7 1371
1333fe93
TT		 1372 max_groups = fs->group_desc_count;
1373 if (max_groups > old_fs->group_desc_count)
1374 max_groups = old_fs->group_desc_count;
c762c8e6 1375 group_blk = old_fs->super->s_first_data_block;
24b2c7a7
TT		 1376 /*
1377 * If we're reducing the number of descriptor blocks, this
1378 * makes life easy. :-) We just have to mark some extra
1379 * blocks as free.
1380 */
1381 if (old_blocks > new_blocks) {
118d3f0b
DW		 1382 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
1383 retval = ext2fs_allocate_block_bitmap(fs,
1384 _("new meta blocks"),
1385 &new_meta_bmap);
1386 if (retval)
1387 goto errout;
1388
1389 retval = mark_table_blocks(fs, new_meta_bmap);
1390 if (retval)
1391 goto errout;
1392 }
1393
1333fe93 1394 for (i = 0; i < max_groups; i++) {
8e98899b 1395 if (!ext2fs_bg_has_super(old_fs, i)) {
1e1da29f 1396 group_blk += fs->super->s_blocks_per_group;
24b2c7a7
TT		 1397 continue;
1398 }
118d3f0b
DW		 1399 group_end = group_blk + 1 + old_blocks;
1400 for (blk = group_blk + 1 + new_blocks;
1401 blk < group_end;) {
1402 if (new_meta_bmap == NULL ||
1403 !ext2fs_test_block_bitmap2(new_meta_bmap,
1404 blk)) {
1405 cluster_freed =
1406 EXT2FS_CLUSTER_RATIO(fs) -
1407 (blk &
1408 EXT2FS_CLUSTER_MASK(fs));
1409 if (cluster_freed > group_end - blk)
1410 cluster_freed = group_end - blk;
1411 ext2fs_block_alloc_stats2(fs, blk, -1);
1412 blk += EXT2FS_CLUSTER_RATIO(fs);
1413 rfs->needed_blocks -= cluster_freed;
1414 continue;
1415 }
052db4b7 1416 rfs->needed_blocks--;
118d3f0b 1417 blk++;
052db4b7 1418 }
1e1da29f 1419 group_blk += fs->super->s_blocks_per_group;
24b2c7a7 1420 }
c762c8e6
TT		 1421 retval = 0;
1422 goto errout;
24b2c7a7
TT		 1423 }
1424 /*
1425 * If we're increasing the number of descriptor blocks, life
efc6f628 1426 * gets interesting....
24b2c7a7 1427 */
f2de1d38 1428 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
21e37be6 1429 flex_bg = ext2fs_has_feature_flex_bg(fs->super);
2ebaeb35 1430 /* first reserve all of the existing fs meta blocks */
1333fe93 1431 for (i = 0; i < max_groups; i++) {
76dd5e5c
TT		 1432 has_super = ext2fs_bg_has_super(fs, i);
1433 if (has_super)
1434 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
1435
1436 meta_bg = i / meta_bg_size;
21e37be6 1437 if (!ext2fs_has_feature_meta_bg(fs->super) ||
76dd5e5c 1438 (meta_bg < fs->super->s_first_meta_bg)) {
424cb7b6
TT		 1439 if (has_super) {
1440 for (blk = group_blk+1;
1441 blk < group_blk + 1 + new_blocks; blk++)
efc6f628 1442 mark_fs_metablock(rfs, meta_bmap,
424cb7b6
TT		 1443 i, blk);
1444 }
76dd5e5c
TT		 1445 } else {
1446 if (has_super)
1447 has_super = 1;
1448 if (((i % meta_bg_size) == 0) ||
1449 ((i % meta_bg_size) == 1) ||
1450 ((i % meta_bg_size) == (meta_bg_size-1)))
1451 mark_fs_metablock(rfs, meta_bmap, i,
1452 group_blk + has_super);
24b2c7a7 1453 }
76dd5e5c 1454
1e1da29f 1455 /*
c762c8e6
TT		 1456 * Reserve the existing meta blocks that we know
1457 * aren't to be moved.
4b04fb30
TT		 1458 *
1459 * For flex_bg file systems, in order to avoid
1460 * overwriting fs metadata (especially inode table
1461 * blocks) belonging to a different block group when
1462 * we are relocating the inode tables, we need to
1463 * reserve all existing fs metadata blocks.
1e1da29f 1464 */
d7cca6b0 1465 if (ext2fs_block_bitmap_loc(fs, i))
3346084b 1466 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
d7cca6b0 1467 ext2fs_block_bitmap_loc(fs, i));
4b04fb30
TT		 1468 else if (flex_bg && i < old_fs->group_desc_count)
1469 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1470 ext2fs_block_bitmap_loc(old_fs, i));
1471
d7cca6b0 1472 if (ext2fs_inode_bitmap_loc(fs, i))
3346084b 1473 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
d7cca6b0 1474 ext2fs_inode_bitmap_loc(fs, i));
4b04fb30
TT		 1475 else if (flex_bg && i < old_fs->group_desc_count)
1476 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1477 ext2fs_inode_bitmap_loc(old_fs, i));
1478
d7cca6b0 1479 if (ext2fs_inode_table_loc(fs, i))
a0ba54ec
TT		 1480 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1481 ext2fs_inode_table_loc(fs, i),
1482 fs->inode_blocks_per_group);
4b04fb30 1483 else if (flex_bg && i < old_fs->group_desc_count)
a0ba54ec
TT		 1484 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1485 ext2fs_inode_table_loc(old_fs, i),
1486 old_fs->inode_blocks_per_group);
24b2c7a7 1487
2ebaeb35
TT		 1488 group_blk += rfs->new_fs->super->s_blocks_per_group;
1489 }
1490
1491 /* Allocate the missing data structures */
1492 for (i = 0; i < max_groups; i++) {
1493 if (ext2fs_inode_table_loc(fs, i) &&
1494 ext2fs_inode_bitmap_loc(fs, i) &&
1495 ext2fs_block_bitmap_loc(fs, i))
1496 continue;
24b2c7a7 1497
1e1da29f
TT		 1498 retval = ext2fs_allocate_group_table(fs, i,
1499 rfs->reserve_blocks);
1500 if (retval)
c762c8e6 1501 goto errout;
24b2c7a7 1502
1e1da29f 1503 /*
c762c8e6
TT		 1504 * For those structures that have changed, we need to
1505 * do bookkeepping.
1e1da29f 1506 */
d7cca6b0
VAH		 1507 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1508 (blk = ext2fs_block_bitmap_loc(fs, i))) {
48f23054 1509 ext2fs_block_alloc_stats2(fs, blk, +1);
3346084b
VAH		 1510 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1511 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1512 ext2fs_mark_block_bitmap2(rfs->move_blocks,
c762c8e6
TT		 1513 blk);
1514 }
d7cca6b0
VAH		 1515 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1516 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
48f23054 1517 ext2fs_block_alloc_stats2(fs, blk, +1);
3346084b
VAH		 1518 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1519 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1520 ext2fs_mark_block_bitmap2(rfs->move_blocks,
c762c8e6
TT		 1521 blk);
1522 }
24b2c7a7 1523
052db4b7
TT		 1524 /*
1525 * The inode table, if we need to relocate it, is
1526 * handled specially. We have to reserve the blocks
1527 * for both the old and the new inode table, since we
1528 * can't have the inode table be destroyed during the
1529 * block relocation phase.
1530 */
d7cca6b0 1531 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
2ebaeb35 1532 continue; /* inode table not moved */
052db4b7 1533
c762c8e6 1534 rfs->needed_blocks += fs->inode_blocks_per_group;
052db4b7
TT		 1535
1536 /*
1537 * Mark the new inode table as in use in the new block
efc6f628 1538 * allocation bitmap, and move any blocks that might
c762c8e6 1539 * be necessary.
052db4b7 1540 */
d7cca6b0 1541 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
c762c8e6 1542 j < fs->inode_blocks_per_group ; j++, blk++) {
48f23054 1543 ext2fs_block_alloc_stats2(fs, blk, +1);
3346084b
VAH		 1544 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1545 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1546 ext2fs_mark_block_bitmap2(rfs->move_blocks,
c762c8e6
TT		 1547 blk);
1548 }
efc6f628 1549
1e1da29f 1550 /*
052db4b7
TT		 1551 * Make sure the old inode table is reserved in the
1552 * block reservation bitmap.
1e1da29f 1553 */
d7cca6b0 1554 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
052db4b7 1555 j < fs->inode_blocks_per_group ; j++, blk++)
3346084b 1556 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1e1da29f 1557 }
c762c8e6
TT		 1558 retval = 0;
1559
1560errout:
118d3f0b
DW		 1561 if (new_meta_bmap)
1562 ext2fs_free_block_bitmap(new_meta_bmap);
c762c8e6
TT		 1563 if (meta_bmap)
1564 ext2fs_free_block_bitmap(meta_bmap);
efc6f628 1565
c762c8e6 1566 return retval;
1e1da29f 1567}
24b2c7a7 1568
a8519a2d
TT		 1569/*
1570 * This helper function tries to allocate a new block. We try to
1571 * avoid hitting the original group descriptor blocks at least at
1572 * first, since we want to make it possible to recover from a badly
1573 * aborted resize operation as much as possible.
1574 *
1575 * In the future, I may further modify this routine to balance out
1576 * where we get the new blocks across the various block groups.
1577 * Ideally we would allocate blocks that corresponded with the block
1578 * group of the containing inode, and keep contiguous blocks
1579 * together. However, this very difficult to do efficiently, since we
1580 * don't have the necessary information up front.
1581 */
1582
1583#define AVOID_OLD 1
1584#define DESPERATION 2
1585
1586static void init_block_alloc(ext2_resize_t rfs)
1587{
1588 rfs->alloc_state = AVOID_OLD;
1589 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
2bc4d4f7
TT		 1590#if 0
1591 /* HACK for testing */
4efbac6f
VAH		 1592 if (ext2fs_blocks_count(rfs->new_fs->super) >
1593 ext2fs_blocks_count(rfs->old_fs->super))
1594 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
2bc4d4f7 1595#endif
a8519a2d
TT		 1596}
1597
8728d506 1598static blk64_t get_new_block(ext2_resize_t rfs)
a8519a2d
TT		 1599{
1600 ext2_filsys fs = rfs->new_fs;
efc6f628 1601
a8519a2d 1602 while (1) {
4efbac6f 1603 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
a8519a2d
TT		 1604 if (rfs->alloc_state == DESPERATION)
1605 return 0;
1606
1607#ifdef RESIZE2FS_DEBUG
1608 if (rfs->flags & RESIZE_DEBUG_BMOVE)
f35fd3d5
TT		 1609 printf("Going into desperation mode "
1610 "for block allocations\n");
efc6f628 1611#endif
a8519a2d
TT		 1612 rfs->alloc_state = DESPERATION;
1613 rfs->new_blk = fs->super->s_first_data_block;
1614 continue;
1615 }
3346084b
VAH		 1616 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1617 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
a8519a2d
TT		 1618 rfs->new_blk) ||
1619 ((rfs->alloc_state == AVOID_OLD) &&
4efbac6f 1620 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
3346084b 1621 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
a8519a2d
TT		 1622 rfs->new_blk))) {
1623 rfs->new_blk++;
1624 continue;
1625 }
1626 return rfs->new_blk;
1627 }
1628}
1629
25f291c9
TT		 1630static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
1631 blk64_t goal EXT2FS_ATTR((unused)),
7f9c96ee
TT		 1632 blk64_t *ret)
1633{
1634 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
8728d506 1635 blk64_t blk;
f3745728 1636 int group;
7f9c96ee
TT		 1637
1638 blk = get_new_block(rfs);
1639 if (!blk)
1640 return ENOSPC;
1641
1642#ifdef RESIZE2FS_DEBUG
1643 if (rfs->flags & 0xF)
8728d506 1644 printf("get_alloc_block allocating %llu\n", blk);
7f9c96ee
TT		 1645#endif
1646
3346084b
VAH		 1647 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1648 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
f3745728
ES		 1649
1650 group = ext2fs_group_of_blk2(rfs->old_fs, blk);
1651 ext2fs_clear_block_uninit(rfs->old_fs, group);
1652 group = ext2fs_group_of_blk2(rfs->new_fs, blk);
1653 ext2fs_clear_block_uninit(rfs->new_fs, group);
1654
7f9c96ee
TT		 1655 *ret = (blk64_t) blk;
1656 return 0;
1657}
1658
a8519a2d
TT		 1659static errcode_t block_mover(ext2_resize_t rfs)
1660{
8728d506 1661 blk64_t blk, old_blk, new_blk;
a8519a2d
TT		 1662 ext2_filsys fs = rfs->new_fs;
1663 ext2_filsys old_fs = rfs->old_fs;
1664 errcode_t retval;
8728d506
VAH		 1665 __u64 size;
1666 int c;
a8519a2d 1667 int to_move, moved;
7d7bdd57
TT		 1668 ext2_badblocks_list badblock_list = 0;
1669 int bb_modified = 0;
efc6f628 1670
7f9c96ee
TT		 1671 fs->get_alloc_block = resize2fs_get_alloc_block;
1672 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1673
7d7bdd57
TT		 1674 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1675 if (retval)
1676 return retval;
a8519a2d
TT		 1677
1678 new_blk = fs->super->s_first_data_block;
1679 if (!rfs->itable_buf) {
e5aace90 1680 retval = ext2fs_get_array(fs->blocksize,
a8519a2d 1681 fs->inode_blocks_per_group,
c4e3d3f3 1682 &rfs->itable_buf);
a8519a2d
TT		 1683 if (retval)
1684 return retval;
1685 }
1686 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1687 if (retval)
1688 return retval;
1689
1690 /*
1691 * The first step is to figure out where all of the blocks
1692 * will go.
1693 */
1694 to_move = moved = 0;
1695 init_block_alloc(rfs);
d1a1a583
TT		 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)) {
3346084b 1699 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
a8519a2d 1700 continue;
3346084b 1701 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
a8519a2d 1702 continue;
7d7bdd57
TT		 1703 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1704 ext2fs_badblocks_list_del(badblock_list, blk);
1705 bb_modified++;
1706 continue;
1707 }
a8519a2d
TT		 1708
1709 new_blk = get_new_block(rfs);
1710 if (!new_blk) {
1711 retval = ENOSPC;
1712 goto errout;
1713 }
48f23054 1714 ext2fs_block_alloc_stats2(fs, new_blk, +1);
d1a1a583 1715 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
a8519a2d
TT		 1716 to_move++;
1717 }
efc6f628 1718
a8519a2d 1719 if (to_move == 0) {
cefbf487
TT		 1720 if (rfs->bmap) {
1721 ext2fs_free_extent_table(rfs->bmap);
1722 rfs->bmap = 0;
1723 }
a8519a2d
TT		 1724 retval = 0;
1725 goto errout;
1726 }
1727
1728 /*
1729 * Step two is to actually move the blocks
1730 */
1731 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1732 if (retval) goto errout;
1733
3b627e8d
TT		 1734 if (rfs->progress) {
1735 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1736 0, to_move);
1737 if (retval)
1738 goto errout;
1739 }
a8519a2d
TT		 1740 while (1) {
1741 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1742 if (retval) goto errout;
1743 if (!size)
1744 break;
d1a1a583
TT		 1745 old_blk = C2B(old_blk);
1746 new_blk = C2B(new_blk);
1747 size = C2B(size);
a8519a2d
TT		 1748#ifdef RESIZE2FS_DEBUG
1749 if (rfs->flags & RESIZE_DEBUG_BMOVE)
8728d506 1750 printf("Moving %llu blocks %llu->%llu\n",
f35fd3d5 1751 size, old_blk, new_blk);
a8519a2d
TT		 1752#endif
1753 do {
1754 c = size;
1755 if (c > fs->inode_blocks_per_group)
1756 c = fs->inode_blocks_per_group;
24a117ab
VAH		 1757 retval = io_channel_read_blk64(fs->io, old_blk, c,
1758 rfs->itable_buf);
a8519a2d 1759 if (retval) goto errout;
24a117ab
VAH		 1760 retval = io_channel_write_blk64(fs->io, new_blk, c,
1761 rfs->itable_buf);
a8519a2d
TT		 1762 if (retval) goto errout;
1763 size -= c;
1764 new_blk += c;
1765 old_blk += c;
1766 moved += c;
1767 if (rfs->progress) {
1768 io_channel_flush(fs->io);
3b627e8d
TT		 1769 retval = (rfs->progress)(rfs,
1770 E2_RSZ_BLOCK_RELOC_PASS,
a8519a2d 1771 moved, to_move);
3b627e8d
TT		 1772 if (retval)
1773 goto errout;
a8519a2d
TT		 1774 }
1775 } while (size > 0);
1776 io_channel_flush(fs->io);
1777 }
1778
1779errout:
7d7bdd57
TT		 1780 if (badblock_list) {
1781 if (!retval && bb_modified)
1782 retval = ext2fs_update_bb_inode(old_fs,
1783 badblock_list);
1784 ext2fs_badblocks_list_free(badblock_list);
1785 }
a8519a2d
TT		 1786 return retval;
1787}
1788
1789
1790/* --------------------------------------------------------------------
1791 *
1792 * Resize processing, phase 3
1793 *
1794 * --------------------------------------------------------------------
1795 */
1796
1797
d1a1a583
TT		 1798/*
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.
1802 */
f404167d 1803static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
d1a1a583
TT		 1804{
1805 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1806
1807 if (new_block != 0)
1808 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1809 return new_block;
1810}
1811
a8519a2d
TT		 1812struct process_block_struct {
1813 ext2_resize_t rfs;
dfcdc32f 1814 ext2_ino_t ino;
fb47b94f 1815 ext2_ino_t old_ino;
a8519a2d
TT		 1816 struct ext2_inode * inode;
1817 errcode_t error;
1818 int is_dir;
1819 int changed;
fb47b94f 1820 int has_extents;
a8519a2d
TT		 1821};
1822
8728d506 1823static int process_block(ext2_filsys fs, blk64_t *block_nr,
efc6f628 1824 e2_blkcnt_t blockcnt,
8728d506 1825 blk64_t ref_block EXT2FS_ATTR((unused)),
54434927 1826 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
a8519a2d
TT		 1827{
1828 struct process_block_struct *pb;
1829 errcode_t retval;
8728d506 1830 blk64_t block, new_block;
a8519a2d
TT		 1831 int ret = 0;
1832
1833 pb = (struct process_block_struct *) priv_data;
1834 block = *block_nr;
1835 if (pb->rfs->bmap) {
d1a1a583 1836 new_block = extent_translate(fs, pb->rfs->bmap, block);
a8519a2d
TT		 1837 if (new_block) {
1838 *block_nr = new_block;
1839 ret |= BLOCK_CHANGED;
1840 pb->changed = 1;
1841#ifdef RESIZE2FS_DEBUG
1842 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
8728d506 1843 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
fb47b94f
DW		 1844 pb->old_ino, blockcnt, block,
1845 new_block);
a8519a2d
TT		 1846#endif
1847 block = new_block;
1848 }
1849 }
fb47b94f 1850
a8519a2d 1851 if (pb->is_dir) {
8728d506
VAH		 1852 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1853 block, (int) blockcnt);
a8519a2d
TT		 1854 if (retval) {
1855 pb->error = retval;
1856 ret |= BLOCK_ABORT;
1857 }
1858 }
1859 return ret;
1860}
1861
1862/*
1863 * Progress callback
1864 */
efc6f628 1865static errcode_t progress_callback(ext2_filsys fs,
54434927 1866 ext2_inode_scan scan EXT2FS_ATTR((unused)),
a8519a2d
TT		 1867 dgrp_t group, void * priv_data)
1868{
1869 ext2_resize_t rfs = (ext2_resize_t) priv_data;
3b627e8d 1870 errcode_t retval;
a8519a2d
TT		 1871
1872 /*
f4b2a6db
TT		 1873 * This check is to protect against old ext2 libraries. It
1874 * shouldn't be needed against new libraries.
a8519a2d 1875 */
f4b2a6db 1876 if ((group+1) == 0)
a8519a2d
TT		 1877 return 0;
1878
1879 if (rfs->progress) {
1880 io_channel_flush(fs->io);
3b627e8d
TT		 1881 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1882 group+1, fs->group_desc_count);
1883 if (retval)
1884 return retval;
a8519a2d 1885 }
efc6f628 1886
a8519a2d
TT		 1887 return 0;
1888}
1889
fb47b94f
DW		 1890static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
1891 struct ext2_inode *inode, int *changed)
1892{
180f376b 1893 char *buf = NULL;
fb47b94f
DW		 1894 blk64_t new_block;
1895 errcode_t err = 0;
1896
1897 /* No EA block or no remapping? Quit early. */
1898 if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 && !rfs->bmap)
1899 return 0;
1900 new_block = extent_translate(rfs->old_fs, rfs->bmap,
1901 ext2fs_file_acl_block(rfs->old_fs, inode));
1902 if (new_block == 0)
1903 return 0;
1904
1905 /* Set the new ACL block */
1906 ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
1907
1908 /* Update checksum */
21e37be6 1909 if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
fb47b94f
DW		 1910 err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
1911 if (err)
1912 return err;
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;
1916 if (err)
1917 goto out;
1918 err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
1919 if (err)
1920 goto out;
1921 }
1922 *changed = 1;
1923
1924out:
1925 ext2fs_free_mem(&buf);
1926 return err;
1927}
1928
fb303847
DW		 1929/* Rewrite extents */
1930static errcode_t rewrite_extents(ext2_filsys fs, ext2_ino_t ino)
1931{
1932 ext2_extent_handle_t handle;
1933 struct ext2fs_extent extent;
1934 errcode_t errcode;
1935 struct ext2_extent_info info;
1936
1937 errcode = ext2fs_extent_open(fs, ino, &handle);
1938 if (errcode)
1939 return errcode;
1940
1941 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent);
1942 if (errcode)
1943 goto out;
1944
1945 do {
1946 errcode = ext2fs_extent_get_info(handle, &info);
1947 if (errcode)
1948 break;
1949
1950 /*
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.
1954 */
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);
1958 if (errcode)
1959 break;
1960 }
1961
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,
1966 &extent);
1967 if (errcode)
1968 break;
1969 }
1970
1971 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT, &extent);
1972 } while (errcode == 0);
1973
1974out:
1975 /* Ok if we run off the end */
1976 if (errcode == EXT2_ET_EXTENT_NO_NEXT)
1977 errcode = 0;
1978 ext2fs_extent_free(handle);
1979 return errcode;
1980}
1981
25f291c9
TT		 1982static 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)))
538ef363
DW		 1986{
1987}
1988
a8519a2d
TT		 1989static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1990{
1991 struct process_block_struct pb;
dfcdc32f 1992 ext2_ino_t ino, new_inode;
edfd9b0a 1993 struct ext2_inode *inode = NULL;
a8519a2d
TT		 1994 ext2_inode_scan scan = NULL;
1995 errcode_t retval;
a8519a2d 1996 char *block_buf = 0;
dfcdc32f 1997 ext2_ino_t start_to_move;
4ef28824 1998 int inode_size;
efc6f628 1999
a8519a2d
TT		 2000 if ((rfs->old_fs->group_desc_count <=
2001 rfs->new_fs->group_desc_count) &&
2002 !rfs->bmap)
2003 return 0;
2004
538ef363 2005 set_com_err_hook(quiet_com_err_proc);
2bc4d4f7 2006
a8519a2d
TT		 2007 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
2008 if (retval) goto errout;
2009
2010 retval = ext2fs_init_dblist(rfs->old_fs, 0);
2011 if (retval) goto errout;
e5aace90 2012 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
a8519a2d
TT		 2013 if (retval) goto errout;
2014
2015 start_to_move = (rfs->new_fs->group_desc_count *
2016 rfs->new_fs->super->s_inodes_per_group);
efc6f628 2017
3b627e8d
TT		 2018 if (rfs->progress) {
2019 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
2020 0, rfs->old_fs->group_desc_count);
2021 if (retval)
2022 goto errout;
2023 }
a8519a2d
TT		 2024 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
2025 pb.rfs = rfs;
edfd9b0a 2026 pb.inode = inode;
a8519a2d
TT		 2027 pb.error = 0;
2028 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
4ef28824 2029 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
edfd9b0a
TT		 2030 inode = malloc(inode_size);
2031 if (!inode) {
4ef28824
ES		 2032 retval = ENOMEM;
2033 goto errout;
2034 }
a8519a2d
TT		 2035 /*
2036 * First, copy all of the inodes that need to be moved
2037 * elsewhere in the inode table
2038 */
2039 while (1) {
edfd9b0a 2040 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
a8519a2d
TT		 2041 if (retval) goto errout;
2042 if (!ino)
2043 break;
2044
edfd9b0a 2045 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
a8519a2d
TT		 2046 continue; /* inode not in use */
2047
edfd9b0a 2048 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
a8519a2d
TT		 2049 pb.changed = 0;
2050
fb47b94f
DW		 2051 /* Remap EA block */
2052 retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
2053 if (retval)
2054 goto errout;
a8519a2d 2055
fb47b94f 2056 new_inode = ino;
a8519a2d 2057 if (ino <= start_to_move)
fb47b94f 2058 goto remap_blocks; /* Don't need to move inode. */
a8519a2d
TT		 2059
2060 /*
fb47b94f
DW		 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.
a8519a2d 2064 */
86acdebd
TT		 2065 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
2066 if (retval)
2067 goto errout;
2068
74128f8d
TT		 2069 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
2070 pb.is_dir);
edfd9b0a 2071 inode->i_ctime = time(0);
4ef28824 2072 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
edfd9b0a 2073 inode, inode_size);
fb47b94f
DW		 2074 if (retval)
2075 goto errout;
2076 pb.changed = 0;
a8519a2d 2077
a8519a2d
TT		 2078#ifdef RESIZE2FS_DEBUG
2079 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
f35fd3d5 2080 printf("Inode moved %u->%u\n", ino, new_inode);
a8519a2d
TT		 2081#endif
2082 if (!rfs->imap) {
2083 retval = ext2fs_create_extent_table(&rfs->imap, 0);
2084 if (retval)
2085 goto errout;
2086 }
2087 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
fb47b94f
DW		 2088
2089remap_blocks:
2090 if (pb.changed)
2091 retval = ext2fs_write_inode_full(rfs->old_fs,
2092 new_inode,
2093 inode, inode_size);
2094 if (retval)
2095 goto errout;
2096
fb303847 2097 /* Rewrite extent block checksums with new inode number */
21e37be6 2098 if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
fb303847
DW		 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;
2103 if (retval)
2104 goto errout;
2105 }
2106
fb47b94f
DW		 2107 /*
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.
2111 */
2112 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
2113 (rfs->bmap || pb.is_dir)) {
2114 pb.ino = new_inode;
2115 pb.old_ino = ino;
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;
2122 if (retval)
2123 goto errout;
2124 if (pb.error) {
2125 retval = pb.error;
2126 goto errout;
2127 }
d05c9c7a
DW		 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,
2132 new_inode, 0, 0);
2133 if (retval)
2134 goto errout;
fb47b94f 2135 }
a8519a2d
TT		 2136 }
2137 io_channel_flush(rfs->old_fs->io);
2138
2139errout:
538ef363 2140 reset_com_err_hook();
a8519a2d
TT		 2141 if (rfs->bmap) {
2142 ext2fs_free_extent_table(rfs->bmap);
2143 rfs->bmap = 0;
2144 }
2145 if (scan)
2146 ext2fs_close_inode_scan(scan);
2147 if (block_buf)
c4e3d3f3 2148 ext2fs_free_mem(&block_buf);
45e338f5 2149 free(inode);
a8519a2d
TT		 2150 return retval;
2151}
2152
2153/* --------------------------------------------------------------------
2154 *
2155 * Resize processing, phase 4.
2156 *
2157 * --------------------------------------------------------------------
2158 */
2159
2160struct istruct {
2161 ext2_resize_t rfs;
3b627e8d 2162 errcode_t err;
03fa6f8a
TT		 2163 unsigned int max_dirs;
2164 unsigned int num;
a8519a2d
TT		 2165};
2166
efc6f628 2167static int check_and_change_inodes(ext2_ino_t dir,
54434927 2168 int entry EXT2FS_ATTR((unused)),
a8519a2d 2169 struct ext2_dir_entry *dirent, int offset,
54434927 2170 int blocksize EXT2FS_ATTR((unused)),
efc6f628 2171 char *buf EXT2FS_ATTR((unused)),
54434927 2172 void *priv_data)
a8519a2d
TT		 2173{
2174 struct istruct *is = (struct istruct *) priv_data;
085d2a83
TT		 2175 struct ext2_inode inode;
2176 ext2_ino_t new_inode;
2177 errcode_t retval;
fb47b94f 2178 int ret = 0;
a8519a2d
TT		 2179
2180 if (is->rfs->progress && offset == 0) {
2181 io_channel_flush(is->rfs->old_fs->io);
3b627e8d
TT		 2182 is->err = (is->rfs->progress)(is->rfs,
2183 E2_RSZ_INODE_REF_UPD_PASS,
1333fe93 2184 ++is->num, is->max_dirs);
3b627e8d
TT		 2185 if (is->err)
2186 return DIRENT_ABORT;
a8519a2d
TT		 2187 }
2188
fb47b94f
DW		 2189 /*
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.
2192 */
21e37be6 2193 if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
fb47b94f
DW		 2194 !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
2195 ret |= DIRENT_CHANGED;
2196
a8519a2d 2197 if (!dirent->inode)
fb47b94f 2198 return ret;
a8519a2d
TT		 2199
2200 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
2201
2202 if (!new_inode)
fb47b94f 2203 return ret;
a8519a2d
TT		 2204#ifdef RESIZE2FS_DEBUG
2205 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
f35fd3d5 2206 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
70f4632b 2207 dir, ext2fs_dirent_name_len(dirent), dirent->name,
a8519a2d
TT		 2208 dirent->inode, new_inode);
2209#endif
2210
2211 dirent->inode = new_inode;
2212
085d2a83
TT		 2213 /* Update the directory mtime and ctime */
2214 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
2215 if (retval == 0) {
2216 inode.i_mtime = inode.i_ctime = time(0);
d2b2a488
BB		 2217 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
2218 if (is->err)
fb47b94f 2219 return ret | DIRENT_ABORT;
085d2a83
TT		 2220 }
2221
fb47b94f 2222 return ret | DIRENT_CHANGED;
a8519a2d
TT		 2223}
2224
2225static errcode_t inode_ref_fix(ext2_resize_t rfs)
2226{
2227 errcode_t retval;
2228 struct istruct is;
efc6f628 2229
a8519a2d
TT		 2230 if (!rfs->imap)
2231 return 0;
efc6f628 2232
a8519a2d
TT		 2233 /*
2234 * Now, we iterate over all of the directories to update the
2235 * inode references
2236 */
2237 is.num = 0;
8728d506 2238 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
a8519a2d 2239 is.rfs = rfs;
3b627e8d 2240 is.err = 0;
a8519a2d 2241
3b627e8d
TT		 2242 if (rfs->progress) {
2243 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1333fe93 2244 0, is.max_dirs);
3b627e8d
TT		 2245 if (retval)
2246 goto errout;
2247 }
efc6f628 2248
fb47b94f 2249 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
a8519a2d
TT		 2250 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
2251 DIRENT_FLAG_INCLUDE_EMPTY, 0,
2252 check_and_change_inodes, &is);
fb47b94f 2253 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
3b627e8d
TT		 2254 if (retval)
2255 goto errout;
2256 if (is.err) {
2257 retval = is.err;
2258 goto errout;
2259 }
a8519a2d 2260
88dbf828
TT		 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);
2264
3b627e8d 2265errout:
a8519a2d
TT		 2266 ext2fs_free_extent_table(rfs->imap);
2267 rfs->imap = 0;
2268 return retval;
2269}
2270
2271
2272/* --------------------------------------------------------------------
2273 *
2274 * Resize processing, phase 5.
2275 *
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 * --------------------------------------------------------------------
2283 */
2284
24b2c7a7 2285
052db4b7
TT		 2286/*
2287 * A very scary routine --- this one moves the inode table around!!!
2288 *
2289 * After this you have to use the rfs->new_fs file handle to read and
2290 * write inodes.
2291 */
c762c8e6 2292static errcode_t move_itables(ext2_resize_t rfs)
052db4b7 2293{
8728d506
VAH		 2294 int n, num, size;
2295 long long diff;
54434927 2296 dgrp_t i, max_groups;
052db4b7 2297 ext2_filsys fs = rfs->new_fs;
05e112a1 2298 char *cp;
118d3f0b 2299 blk64_t old_blk, new_blk, blk, cluster_freed;
a8519a2d 2300 errcode_t retval;
64ad98ac 2301 int j, to_move, moved;
118d3f0b 2302 ext2fs_block_bitmap new_bmap = NULL;
052db4b7 2303
1333fe93
TT		 2304 max_groups = fs->group_desc_count;
2305 if (max_groups > rfs->old_fs->group_desc_count)
2306 max_groups = rfs->old_fs->group_desc_count;
052db4b7 2307
05e112a1
TT		 2308 size = fs->blocksize * fs->inode_blocks_per_group;
2309 if (!rfs->itable_buf) {
c4e3d3f3 2310 retval = ext2fs_get_mem(size, &rfs->itable_buf);
ca8abba7
TT		 2311 if (retval)
2312 return retval;
05e112a1 2313 }
c762c8e6 2314
118d3f0b
DW		 2315 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
2316 retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
2317 &new_bmap);
2318 if (retval)
2319 return retval;
2320
2321 retval = mark_table_blocks(fs, new_bmap);
2322 if (retval)
2323 goto errout;
2324 }
2325
c762c8e6
TT		 2326 /*
2327 * Figure out how many inode tables we need to move
2328 */
2329 to_move = moved = 0;
1333fe93 2330 for (i=0; i < max_groups; i++)
d7cca6b0
VAH		 2331 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
2332 ext2fs_inode_table_loc(fs, i))
c762c8e6
TT		 2333 to_move++;
2334
c916e524
DW		 2335 if (to_move == 0) {
2336 retval = 0;
2337 goto errout;
2338 }
c762c8e6 2339
3b627e8d
TT		 2340 if (rfs->progress) {
2341 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2342 0, to_move);
2343 if (retval)
2344 goto errout;
2345 }
63b44fbe 2346
a8519a2d
TT		 2347 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
2348
1333fe93 2349 for (i=0; i < max_groups; i++) {
d7cca6b0
VAH		 2350 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
2351 new_blk = ext2fs_inode_table_loc(fs, i);
ca8abba7 2352 diff = new_blk - old_blk;
efc6f628 2353
80c0fc34 2354#ifdef RESIZE2FS_DEBUG
efc6f628 2355 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
8728d506 2356 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
ca8abba7 2357 i, old_blk, new_blk, diff);
80c0fc34 2358#endif
efc6f628 2359
05e112a1 2360 if (!diff)
052db4b7 2361 continue;
cd84e9a3
TT		 2362 if (diff < 0)
2363 diff = 0;
052db4b7 2364
24a117ab
VAH		 2365 retval = io_channel_read_blk64(fs->io, old_blk,
2366 fs->inode_blocks_per_group,
2367 rfs->itable_buf);
efc6f628 2368 if (retval)
a8519a2d 2369 goto errout;
05e112a1
TT		 2370 /*
2371 * The end of the inode table segment often contains
a8519a2d
TT		 2372 * all zeros, and we're often only moving the inode
2373 * table down a block or two. If so, we can optimize
2374 * things by not rewriting blocks that we know to be zero
2375 * already.
05e112a1 2376 */
2787276e 2377 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
05e112a1
TT		 2378 if (*cp)
2379 break;
2380 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
80c0fc34 2381#ifdef RESIZE2FS_DEBUG
efc6f628 2382 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
f35fd3d5 2383 printf("%d blocks of zeros...\n", n);
80c0fc34 2384#endif
05e112a1
TT		 2385 num = fs->inode_blocks_per_group;
2386 if (n > diff)
2387 num -= n;
2388
24a117ab
VAH		 2389 retval = io_channel_write_blk64(fs->io, new_blk,
2390 num, rfs->itable_buf);
052db4b7 2391 if (retval) {
24a117ab
VAH		 2392 io_channel_write_blk64(fs->io, old_blk,
2393 num, rfs->itable_buf);
a8519a2d 2394 goto errout;
052db4b7 2395 }
05e112a1 2396 if (n > diff) {
24a117ab 2397 retval = io_channel_write_blk64(fs->io,
ca8abba7 2398 old_blk + fs->inode_blocks_per_group,
a8519a2d
TT		 2399 diff, (rfs->itable_buf +
2400 (fs->inode_blocks_per_group - diff) *
2401 fs->blocksize));
05e112a1 2402 if (retval)
a8519a2d 2403 goto errout;
c762c8e6 2404 }
64ad98ac 2405
d7cca6b0 2406 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
118d3f0b
DW		 2407 j < fs->inode_blocks_per_group;) {
2408 if (new_bmap == NULL ||
2409 !ext2fs_test_block_bitmap2(new_bmap, blk)) {
2410 ext2fs_block_alloc_stats2(fs, blk, -1);
2411 cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
2412 (blk & EXT2FS_CLUSTER_MASK(fs));
2413 blk += cluster_freed;
2414 j += cluster_freed;
2415 continue;
2416 }
2417 blk++;
2418 j++;
2419 }
64ad98ac 2420
d7cca6b0 2421 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
236efede 2422 ext2fs_group_desc_csum_set(rfs->old_fs, i);
a8519a2d 2423 ext2fs_mark_super_dirty(rfs->old_fs);
64ad98ac
TT		 2424 ext2fs_flush(rfs->old_fs);
2425
a8519a2d 2426 if (rfs->progress) {
3b627e8d
TT		 2427 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2428 ++moved, to_move);
2429 if (retval)
2430 goto errout;
a8519a2d 2431 }
052db4b7 2432 }
64ad98ac 2433 mark_table_blocks(fs, fs->block_map);
a8519a2d 2434 ext2fs_flush(fs);
80c0fc34 2435#ifdef RESIZE2FS_DEBUG
efc6f628 2436 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
f35fd3d5 2437 printf("Inode table move finished.\n");
80c0fc34 2438#endif
118d3f0b 2439 retval = 0;
efc6f628 2440
a8519a2d 2441errout:
118d3f0b
DW		 2442 if (new_bmap)
2443 ext2fs_free_block_bitmap(new_bmap);
052db4b7
TT		 2444 return retval;
2445}
2446
65c6c3e0
TT		 2447/*
2448 * This function is used when expanding a file system. It frees the
2449 * superblock and block group descriptor blocks from the block group
2450 * which is no longer the last block group.
2451 */
2452static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
2453{
2454 ext2_filsys fs = rfs->new_fs;
2455 ext2_filsys old_fs = rfs->old_fs;
2456 errcode_t retval;
2457 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2458 dgrp_t last_bg = fs->group_desc_count - 1;
2459 blk64_t sb, old_desc;
2460 blk_t num;
2461
21e37be6 2462 if (!ext2fs_has_feature_sparse_super2(fs->super))
65c6c3e0
TT		 2463 return 0;
2464
2465 if (last_bg <= old_last_bg)
2466 return 0;
2467
2468 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2469 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2470 return 0;
2471
2472 if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
2473 old_fs->super->s_backup_bgs[1] != old_last_bg)
2474 return 0;
2475
2476 if (fs->super->s_backup_bgs[0] == old_last_bg ||
2477 fs->super->s_backup_bgs[1] == old_last_bg)
2478 return 0;
2479
aaa1ae08
TT		 2480 if (old_last_bg == 0)
2481 return 0;
2482
65c6c3e0
TT		 2483 retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
2484 &sb, &old_desc, NULL, &num);
2485 if (retval)
2486 return retval;
2487
2488 if (sb)
2489 ext2fs_unmark_block_bitmap2(fs->block_map, sb);
2490 if (old_desc)
2491 ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
2492 return 0;
2493}
2494
2495/*
2496 * This function is used when shrinking a file system. We need to
2497 * utilize blocks from what will be the new last block group for the
2498 * backup superblock and block group descriptor blocks.
2499 * Unfortunately, those blocks may be used by other files or fs
2500 * metadata blocks. We need to mark them as being in use.
2501 */
2502static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
2503 ext2fs_block_bitmap meta_bmap)
2504{
2505 ext2_filsys fs = rfs->new_fs;
2506 ext2_filsys old_fs = rfs->old_fs;
2507 errcode_t retval;
2508 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2509 dgrp_t last_bg = fs->group_desc_count - 1;
2510 dgrp_t g;
2511 blk64_t blk, sb, old_desc;
2512 blk_t i, num;
2513 int realloc = 0;
2514
21e37be6 2515 if (!ext2fs_has_feature_sparse_super2(fs->super))
65c6c3e0
TT		 2516 return 0;
2517
2518 if (last_bg >= old_last_bg)
2519 return 0;
2520
2521 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2522 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2523 return 0;
2524
2525 if (fs->super->s_backup_bgs[0] != last_bg &&
2526 fs->super->s_backup_bgs[1] != last_bg)
2527 return 0;
2528
2529 if (old_fs->super->s_backup_bgs[0] == last_bg ||
2530 old_fs->super->s_backup_bgs[1] == last_bg)
2531 return 0;
2532
2533 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
2534 &sb, &old_desc, NULL, &num);
2535 if (retval)
2536 return retval;
2537
4495c5a0 2538 if (last_bg && !sb) {
65c6c3e0
TT		 2539 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2540 stderr);
2541 exit(1);
2542 }
1244cacc 2543 if (old_desc && old_desc != sb+1) {
65c6c3e0
TT		 2544 fputs(_("Should never happen! Unexpected old_desc in "
2545 "super_sparse bg?\n"),
2546 stderr);
2547 exit(1);
2548 }
2549 num = (old_desc) ? num : 1;
2550
2551 /* Reserve the backup blocks */
2552 ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
2553
2554 for (g = 0; g < fs->group_desc_count; g++) {
2555 blk64_t mb;
2556
2557 mb = ext2fs_block_bitmap_loc(fs, g);
2558 if ((mb >= sb) && (mb < sb + num)) {
2559 ext2fs_block_bitmap_loc_set(fs, g, 0);
2560 realloc = 1;
2561 }
2562 mb = ext2fs_inode_bitmap_loc(fs, g);
2563 if ((mb >= sb) && (mb < sb + num)) {
2564 ext2fs_inode_bitmap_loc_set(fs, g, 0);
2565 realloc = 1;
2566 }
2567 mb = ext2fs_inode_table_loc(fs, g);
2568 if ((mb < sb + num) &&
2569 (sb < mb + fs->inode_blocks_per_group)) {
2570 ext2fs_inode_table_loc_set(fs, g, 0);
2571 realloc = 1;
2572 }
2573 if (realloc) {
2574 retval = ext2fs_allocate_group_table(fs, g, 0);
2575 if (retval)
2576 return retval;
2577 }
2578 }
2579
2580 for (blk = sb, i = 0; i < num; blk++, i++) {
2581 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
2582 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
2583 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
2584 rfs->needed_blocks++;
2585 }
2586 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
2587 }
2588 return 0;
2589}
2590
9213a93b 2591/*
efc6f628 2592 * Fix the resize inode
9213a93b
TT		 2593 */
2594static errcode_t fix_resize_inode(ext2_filsys fs)
2595{
2596 struct ext2_inode inode;
2597 errcode_t retval;
9213a93b 2598
21e37be6 2599 if (!ext2fs_has_feature_resize_inode(fs->super))
9213a93b
TT		 2600 return 0;
2601
9213a93b
TT		 2602 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
2603 if (retval) goto errout;
2604
1ca1059f 2605 ext2fs_iblk_set(fs, &inode, 1);
9213a93b
TT		 2606
2607 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
2608 if (retval) goto errout;
2609
2610 if (!inode.i_block[EXT2_DIND_BLOCK]) {
efc6f628 2611 /*
9213a93b
TT		 2612 * Avoid zeroing out block #0; that's rude. This
2613 * should never happen anyway since the filesystem
2614 * should be fsck'ed and we assume it is consistent.
2615 */
45ff69ff 2616 fprintf(stderr, "%s",
f35fd3d5 2617 _("Should never happen: resize inode corrupt!\n"));
9213a93b
TT		 2618 exit(1);
2619 }
2620
08c8e319
DW		 2621 retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
2622 NULL, NULL);
2623 if (retval)
2624 goto errout;
efc6f628 2625
9213a93b
TT		 2626 retval = ext2fs_create_resize_inode(fs);
2627 if (retval)
2628 goto errout;
2629
2630errout:
9213a93b
TT		 2631 return retval;
2632}
2633
052db4b7
TT		 2634/*
2635 * Finally, recalculate the summary information
2636 */
2637static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
2638{
8728d506 2639 blk64_t blk;
dfcdc32f 2640 ext2_ino_t ino;
54434927
TT		 2641 unsigned int group = 0;
2642 unsigned int count = 0;
2279fd78
TT		 2643 blk64_t total_blocks_free = 0;
2644 int total_inodes_free = 0;
dfcdc32f 2645 int group_free = 0;
74128f8d 2646 int uninit = 0;
8728d506 2647 blk64_t super_blk, old_desc_blk, new_desc_blk;
74128f8d 2648 int old_desc_blocks;
052db4b7
TT		 2649
2650 /*
2651 * First calculate the block statistics
2652 */
cd65a24e 2653 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
8728d506
VAH		 2654 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
2655 &new_desc_blk, 0);
21e37be6 2656 if (ext2fs_has_feature_meta_bg(fs->super))
74128f8d
TT		 2657 old_desc_blocks = fs->super->s_first_meta_bg;
2658 else
2659 old_desc_blocks = fs->desc_blocks +
2660 fs->super->s_reserved_gdt_blocks;
1773c87c
TT		 2661 for (blk = B2C(fs->super->s_first_data_block);
2662 blk < ext2fs_blocks_count(fs->super);
2663 blk += EXT2FS_CLUSTER_RATIO(fs)) {
74128f8d 2664 if ((uninit &&
1773c87c 2665 !(EQ_CLSTR(blk, super_blk) ||
74128f8d 2666 ((old_desc_blk && old_desc_blocks &&
1773c87c
TT		 2667 GE_CLSTR(blk, old_desc_blk) &&
2668 LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
2669 ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
2670 EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
2671 EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
2672 ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
2673 LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
2674 + fs->inode_blocks_per_group))))) ||
3346084b 2675 (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
052db4b7 2676 group_free++;
2279fd78 2677 total_blocks_free++;
052db4b7
TT		 2678 }
2679 count++;
1773c87c
TT		 2680 if ((count == fs->super->s_clusters_per_group) ||
2681 EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
d7cca6b0 2682 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
236efede
JS		 2683 ext2fs_group_desc_csum_set(fs, group);
2684 group++;
4828bbe9
TT		 2685 if (group >= fs->group_desc_count)
2686 break;
052db4b7
TT		 2687 count = 0;
2688 group_free = 0;
8728d506
VAH		 2689 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2690 ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
2691 &old_desc_blk,
2692 &new_desc_blk, 0);
21e37be6 2693 if (ext2fs_has_feature_meta_bg(fs->super))
74128f8d
TT		 2694 old_desc_blocks = fs->super->s_first_meta_bg;
2695 else
2696 old_desc_blocks = fs->desc_blocks +
2697 fs->super->s_reserved_gdt_blocks;
052db4b7
TT		 2698 }
2699 }
1773c87c 2700 total_blocks_free = C2B(total_blocks_free);
2279fd78 2701 ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
efc6f628 2702
052db4b7
TT		 2703 /*
2704 * Next, calculate the inode statistics
2705 */
2706 group_free = 0;
052db4b7
TT		 2707 count = 0;
2708 group = 0;
5830d6be
ES		 2709
2710 /* Protect loop from wrap-around if s_inodes_count maxed */
cd65a24e 2711 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
5830d6be 2712 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
74128f8d 2713 if (uninit ||
3346084b 2714 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
052db4b7 2715 group_free++;
2279fd78 2716 total_inodes_free++;
052db4b7
TT		 2717 }
2718 count++;
2719 if ((count == fs->super->s_inodes_per_group) ||
2720 (ino == fs->super->s_inodes_count)) {
d7cca6b0 2721 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
236efede
JS		 2722 ext2fs_group_desc_csum_set(fs, group);
2723 group++;
4828bbe9
TT		 2724 if (group >= fs->group_desc_count)
2725 break;
052db4b7
TT		 2726 count = 0;
2727 group_free = 0;
cd65a24e 2728 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
052db4b7
TT		 2729 }
2730 }
2279fd78 2731 fs->super->s_free_inodes_count = total_inodes_free;
052db4b7
TT		 2732 ext2fs_mark_super_dirty(fs);
2733 return 0;
2734}
199ddaaa 2735
8a6ede8b
ES		 2736/*
2737 * Journal may have been relocated; update the backup journal blocks
2738 * in the superblock.
2739 */
2740static errcode_t fix_sb_journal_backup(ext2_filsys fs)
2741{
2742 errcode_t retval;
2743 struct ext2_inode inode;
2744
21e37be6 2745 if (!ext2fs_has_feature_journal(fs->super))
8a6ede8b
ES		 2746 return 0;
2747
d93d5bbf
ES		 2748 /* External journal? Nothing to do. */
2749 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2750 return 0;
2751
8a6ede8b
ES		 2752 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2753 if (retval)
2754 return retval;
2755 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
931b58e1 2756 fs->super->s_jnl_blocks[15] = inode.i_size_high;
8a6ede8b
ES		 2757 fs->super->s_jnl_blocks[16] = inode.i_size;
2758 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2759 ext2fs_mark_super_dirty(fs);
2760 return 0;
2761}
2762
7f820344
TT		 2763static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2764 int old_desc_blocks)
2765{
2766 blk64_t super_blk, old_desc_blk, new_desc_blk;
2767 int overhead;
2768
2769 /* inode table blocks plus allocation bitmaps */
2770 overhead = fs->inode_blocks_per_group + 2;
2771
2772 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2773 &old_desc_blk, &new_desc_blk, 0);
2774 if ((grp == 0) || super_blk)
2775 overhead++;
2776 if (old_desc_blk)
2777 overhead += old_desc_blocks;
2778 else if (new_desc_blk)
2779 overhead++;
2780 return overhead;
2781}
2782
2783
199ddaaa
JB		 2784/*
2785 * calcluate the minimum number of blocks the given fs can be resized to
2786 */
e231f175 2787blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
199ddaaa 2788{
8728d506 2789 ext2_ino_t inode_count;
45a78b88 2790 dgrp_t groups, flex_groups;
e231f175 2791 blk64_t blks_needed, data_blocks;
8728d506
VAH		 2792 blk64_t grp, data_needed, last_start;
2793 blk64_t overhead = 0;
7f820344 2794 int old_desc_blocks;
2884d208 2795 int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
199ddaaa
JB		 2796
2797 /*
2798 * first figure out how many group descriptors we need to
2799 * handle the number of inodes we have
2800 */
2801 inode_count = fs->super->s_inodes_count -
2802 fs->super->s_free_inodes_count;
2803 blks_needed = ext2fs_div_ceil(inode_count,
2804 fs->super->s_inodes_per_group) *
1e33a8b4 2805 (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
8728d506
VAH		 2806 groups = ext2fs_div64_ceil(blks_needed,
2807 EXT2_BLOCKS_PER_GROUP(fs->super));
e231f175
TT		 2808#ifdef RESIZE2FS_DEBUG
2809 if (flags & RESIZE_DEBUG_MIN_CALC)
2810 printf("fs has %d inodes, %d groups required.\n",
2811 inode_count, groups);
2812#endif
199ddaaa
JB		 2813
2814 /*
7f820344 2815 * number of old-style block group descriptor blocks
199ddaaa 2816 */
21e37be6 2817 if (ext2fs_has_feature_meta_bg(fs->super))
7f820344
TT		 2818 old_desc_blocks = fs->super->s_first_meta_bg;
2819 else
2820 old_desc_blocks = fs->desc_blocks +
2821 fs->super->s_reserved_gdt_blocks;
199ddaaa
JB		 2822
2823 /* calculate how many blocks are needed for data */
4efbac6f
VAH		 2824 data_needed = ext2fs_blocks_count(fs->super) -
2825 ext2fs_free_blocks_count(fs->super);
199ddaaa 2826
7f820344
TT		 2827 for (grp = 0; grp < fs->group_desc_count; grp++)
2828 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
e231f175
TT		 2829#ifdef RESIZE2FS_DEBUG
2830 if (flags & RESIZE_DEBUG_MIN_CALC)
2831 printf("fs requires %llu data blocks.\n", data_needed);
2832#endif
7f820344
TT		 2833
2834 /*
2835 * For ext4 we need to allow for up to a flex_bg worth of
2836 * inode tables of slack space so the resize operation can be
2837 * guaranteed to finish.
2838 */
45a78b88 2839 flex_groups = groups;
21e37be6 2840 if (ext2fs_has_feature_flex_bg(fs->super)) {
45a78b88
TT		 2841 dgrp_t remainder = groups & (flexbg_size - 1);
2842
2843 flex_groups += flexbg_size - remainder;
2844 if (flex_groups > fs->group_desc_count)
2845 flex_groups = fs->group_desc_count;
c09043f1
TT		 2846 }
2847
199ddaaa
JB		 2848 /*
2849 * figure out how many data blocks we have given the number of groups
2850 * we need for our inodes
2851 */
1e33a8b4 2852 data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
199ddaaa 2853 last_start = 0;
45a78b88 2854 for (grp = 0; grp < flex_groups; grp++) {
7f820344 2855 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
199ddaaa
JB		 2856
2857 /*
2858 * we want to keep track of how much data we can store in
2859 * the groups leading up to the last group so we can determine
2860 * how big the last group needs to be
2861 */
45a78b88 2862 if (grp < (groups - 1))
199ddaaa
JB		 2863 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
2864 overhead;
2865
45a78b88
TT		 2866 if (data_blocks > overhead)
2867 data_blocks -= overhead;
2868 else
2869 data_blocks = 0;
199ddaaa 2870 }
e231f175
TT		 2871#ifdef RESIZE2FS_DEBUG
2872 if (flags & RESIZE_DEBUG_MIN_CALC)
2873 printf("With %d group(s), we have %llu blocks available.\n",
2874 groups, data_blocks);
2875#endif
199ddaaa
JB		 2876
2877 /*
2878 * if we need more group descriptors in order to accomodate our data
2879 * then we need to add them here
2880 */
45a78b88 2881 blks_needed = data_needed;
b4f30fcf
TT		 2882 while (blks_needed > data_blocks) {
2883 blk64_t remainder = blks_needed - data_blocks;
e231f175 2884 dgrp_t extra_grps;
199ddaaa
JB		 2885
2886 /* figure out how many more groups we need for the data */
8728d506
VAH		 2887 extra_grps = ext2fs_div64_ceil(remainder,
2888 EXT2_BLOCKS_PER_GROUP(fs->super));
199ddaaa 2889
1e33a8b4 2890 data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
199ddaaa
JB		 2891
2892 /* ok we have to account for the last group */
7f820344 2893 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
199ddaaa
JB		 2894 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
2895
45a78b88
TT		 2896 grp = flex_groups;
2897 groups += extra_grps;
21e37be6 2898 if (!ext2fs_has_feature_flex_bg(fs->super))
45a78b88
TT		 2899 flex_groups = groups;
2900 else if (groups > flex_groups) {
2901 dgrp_t r = groups & (flexbg_size - 1);
2902
2903 flex_groups = groups + flexbg_size - r;
2904 if (flex_groups > fs->group_desc_count)
2905 flex_groups = fs->group_desc_count;
2906 }
2907
2908 for (; grp < flex_groups; grp++) {
7f820344
TT		 2909 overhead = calc_group_overhead(fs, grp,
2910 old_desc_blocks);
199ddaaa
JB		 2911
2912 /*
2913 * again, we need to see how much data we cram into
2914 * all of the groups leading up to the last group
2915 */
45a78b88 2916 if (grp < groups - 1)
199ddaaa
JB		 2917 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
2918 - overhead;
2919
2920 data_blocks -= overhead;
2921 }
2922
e231f175
TT		 2923#ifdef RESIZE2FS_DEBUG
2924 if (flags & RESIZE_DEBUG_MIN_CALC)
2925 printf("Added %d extra group(s), "
b4f30fcf
TT		 2926 "blks_needed %llu, data_blocks %llu, "
2927 "last_start %llu\n", extra_grps, blks_needed,
2928 data_blocks, last_start);
e231f175 2929#endif
199ddaaa
JB		 2930 }
2931
2932 /* now for the fun voodoo */
45a78b88 2933 grp = groups - 1;
21e37be6 2934 if (ext2fs_has_feature_flex_bg(fs->super) &&
45a78b88
TT		 2935 (grp & ~(flexbg_size - 1)) == 0)
2936 grp = grp & ~(flexbg_size - 1);
2937 overhead = 0;
2938 for (; grp < flex_groups; grp++)
2939 overhead += calc_group_overhead(fs, grp, old_desc_blocks);
2940
e231f175
TT		 2941#ifdef RESIZE2FS_DEBUG
2942 if (flags & RESIZE_DEBUG_MIN_CALC)
2943 printf("Last group's overhead is %llu\n", overhead);
2944#endif
199ddaaa
JB		 2945
2946 /*
2947 * if this is the case then the last group is going to have data in it
2948 * so we need to adjust the size of the last group accordingly
2949 */
b4f30fcf
TT		 2950 if (last_start < blks_needed) {
2951 blk64_t remainder = blks_needed - last_start;
199ddaaa 2952
e231f175
TT		 2953#ifdef RESIZE2FS_DEBUG
2954 if (flags & RESIZE_DEBUG_MIN_CALC)
2955 printf("Need %llu data blocks in last group\n",
2956 remainder);
2957#endif
199ddaaa
JB		 2958 /*
2959 * 50 is a magic number that mkfs/resize uses to see if its
2960 * even worth making/resizing the fs. basically you need to
2961 * have at least 50 blocks in addition to the blocks needed
2962 * for the metadata in the last group
2963 */
2964 if (remainder > 50)
2965 overhead += remainder;
2966 else
2967 overhead += 50;
2968 } else
2969 overhead += 50;
2970
ba8bfa1a 2971 overhead += fs->super->s_first_data_block;
e231f175
TT		 2972#ifdef RESIZE2FS_DEBUG
2973 if (flags & RESIZE_DEBUG_MIN_CALC)
2974 printf("Final size of last group is %lld\n", overhead);
2975#endif
199ddaaa 2976
45a78b88
TT		 2977 /* Add extra slack for bigalloc file systems */
2978 if (EXT2FS_CLUSTER_RATIO(fs) > 1)
2979 overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
2980
199ddaaa 2981 /*
45a78b88
TT		 2982 * since our last group doesn't have to be BLOCKS_PER_GROUP
2983 * large, we only do groups-1, and then add the number of
2984 * blocks needed to handle the group descriptor metadata+data
2985 * that we need
199ddaaa 2986 */
1e33a8b4 2987 blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
199ddaaa
JB		 2988 blks_needed += overhead;
2989
2215293c
TT		 2990 /*
2991 * Make sure blks_needed covers the end of the inode table in
2992 * the last block group.
2993 */
2994 overhead = ext2fs_inode_table_loc(fs, groups-1) +
2995 fs->inode_blocks_per_group;
2996 if (blks_needed < overhead)
2997 blks_needed = overhead;
2998
e231f175
TT		 2999#ifdef RESIZE2FS_DEBUG
3000 if (flags & RESIZE_DEBUG_MIN_CALC)
3001 printf("Estimated blocks needed: %llu\n", blks_needed);
3002#endif
3003
69f7c80e
ES		 3004 /*
3005 * If at this point we've already added up more "needed" than
3006 * the current size, just return current size as minimum.
3007 */
4efbac6f
VAH		 3008 if (blks_needed >= ext2fs_blocks_count(fs->super))
3009 return ext2fs_blocks_count(fs->super);
793a04a0
TT		 3010 /*
3011 * We need to reserve a few extra blocks if extents are
3012 * enabled, in case we need to grow the extent tree. The more
3013 * we shrink the file system, the more space we need.
b4f30fcf
TT		 3014 *
3015 * The absolute worst case is every single data block is in
3016 * the part of the file system that needs to be evacuated,
3017 * with each data block needs to be in its own extent, and
3018 * with each inode needing at least one extent block.
793a04a0 3019 */
21e37be6 3020 if (ext2fs_has_feature_extents(fs->super)) {
e231f175
TT		 3021 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
3022 blks_needed)/500;
b4f30fcf
TT		 3023 unsigned int exts_per_blk = (fs->blocksize /
3024 sizeof(struct ext3_extent)) - 1;
3025 blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
3026 exts_per_blk);
3027
3028 if (worst_case < inode_count)
3029 worst_case = inode_count;
3030
3031 if (safe_margin > worst_case)
3032 safe_margin = worst_case;
3033
e231f175
TT		 3034#ifdef RESIZE2FS_DEBUG
3035 if (flags & RESIZE_DEBUG_MIN_CALC)
3036 printf("Extents safety margin: %llu\n", safe_margin);
3037#endif
3038 blks_needed += safe_margin;
3039 }
793a04a0 3040
199ddaaa
JB		 3041 return blks_needed;
3042}
Unnamed repository; edit this file 'description' to name the repository.