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[thirdparty/e2fsprogs.git] / resize / resize2fs.c
1 /*
2 * resize2fs.c --- ext2 main routine
3 *
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
5 * PowerQuest, Inc.
6 *
7 * Copyright (C) 1999, 2000 by Theodore Ts'o
8 *
9 * %Begin-Header%
10 * This file may be redistributed under the terms of the GNU Public
11 * License.
12 * %End-Header%
13 */
14
15 /*
16 * Resizing a filesystem consists of the following phases:
17 *
18 * 1. Adjust superblock and write out new parts of the inode
19 * table
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.
34 */
35
36 #include "config.h"
37 #include "resize2fs.h"
38 #include <time.h>
39
40 #ifdef __linux__ /* Kludge for debugging */
41 #define RESIZE2FS_DEBUG
42 #endif
43
44 static void fix_uninit_block_bitmaps(ext2_filsys fs);
45 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size);
46 static errcode_t blocks_to_move(ext2_resize_t rfs);
47 static errcode_t block_mover(ext2_resize_t rfs);
48 static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
49 static errcode_t inode_ref_fix(ext2_resize_t rfs);
50 static errcode_t move_itables(ext2_resize_t rfs);
51 static errcode_t fix_resize_inode(ext2_filsys fs);
52 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
53 static errcode_t fix_sb_journal_backup(ext2_filsys fs);
54 static errcode_t mark_table_blocks(ext2_filsys fs,
55 ext2fs_block_bitmap bmap);
56 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs);
57 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
58 ext2fs_block_bitmap meta_bmap);
59 static errcode_t resize_group_descriptors(ext2_resize_t rfs, blk64_t new_size);
60 static errcode_t move_bg_metadata(ext2_resize_t rfs);
61 static errcode_t zero_high_bits_in_inodes(ext2_resize_t rfs);
62
63 /*
64 * Some helper functions to check if a block is in a metadata area
65 */
66 static 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 }
70
71 static 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
76 static 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 }
82
83 /* Some bigalloc helper macros which are more succinct... */
84 #define B2C(x) EXT2FS_B2C(fs, (x))
85 #define C2B(x) EXT2FS_C2B(fs, (x))
86 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
87 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
88 #define LT_CLSTR(x, y) (B2C(x) < B2C(y))
89 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
90 #define GT_CLSTR(x, y) (B2C(x) > B2C(y))
91
92 static int lazy_itable_init;
93
94 /*
95 * This is the top-level routine which does the dirty deed....
96 */
97 errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
98 errcode_t (*progress)(ext2_resize_t rfs, int pass,
99 unsigned long cur,
100 unsigned long max_val))
101 {
102 ext2_resize_t rfs;
103 errcode_t retval;
104 struct resource_track rtrack, overall_track;
105
106 /*
107 * Create the data structure
108 */
109 retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
110 if (retval)
111 return retval;
112
113 memset(rfs, 0, sizeof(struct ext2_resize_struct));
114 fs->priv_data = rfs;
115 rfs->old_fs = fs;
116 rfs->flags = flags;
117 rfs->itable_buf = 0;
118 rfs->progress = progress;
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);
134 retval = ext2fs_dup_handle(fs, &rfs->new_fs);
135 if (retval)
136 goto errout;
137
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
156 init_resource_track(&rtrack, "adjust_superblock", fs->io);
157 retval = adjust_superblock(rfs, *new_size);
158 if (retval)
159 goto errout;
160 print_resource_track(rfs, &rtrack, fs->io);
161
162 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
163 fix_uninit_block_bitmaps(rfs->new_fs);
164 print_resource_track(rfs, &rtrack, fs->io);
165 /* Clear the block bitmap uninit flag for the last block group */
166 ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
167 EXT2_BG_BLOCK_UNINIT);
168
169 *new_size = ext2fs_blocks_count(rfs->new_fs->super);
170
171 init_resource_track(&rtrack, "blocks_to_move", fs->io);
172 retval = blocks_to_move(rfs);
173 if (retval)
174 goto errout;
175 print_resource_track(rfs, &rtrack, fs->io);
176
177 #ifdef RESIZE2FS_DEBUG
178 if (rfs->flags & RESIZE_DEBUG_BMOVE)
179 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
180 ext2fs_free_blocks_count(rfs->old_fs->super),
181 ext2fs_free_blocks_count(rfs->new_fs->super),
182 rfs->needed_blocks);
183 #endif
184
185 init_resource_track(&rtrack, "block_mover", fs->io);
186 retval = block_mover(rfs);
187 if (retval)
188 goto errout;
189 print_resource_track(rfs, &rtrack, fs->io);
190
191 init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
192 retval = inode_scan_and_fix(rfs);
193 if (retval)
194 goto errout;
195 print_resource_track(rfs, &rtrack, fs->io);
196
197 init_resource_track(&rtrack, "inode_ref_fix", fs->io);
198 retval = inode_ref_fix(rfs);
199 if (retval)
200 goto errout;
201 print_resource_track(rfs, &rtrack, fs->io);
202
203 init_resource_track(&rtrack, "move_itables", fs->io);
204 retval = move_itables(rfs);
205 if (retval)
206 goto errout;
207 print_resource_track(rfs, &rtrack, fs->io);
208
209 retval = clear_sparse_super2_last_group(rfs);
210 if (retval)
211 goto errout;
212
213 init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
214 retval = ext2fs_calculate_summary_stats(rfs->new_fs);
215 if (retval)
216 goto errout;
217 print_resource_track(rfs, &rtrack, fs->io);
218
219 init_resource_track(&rtrack, "fix_resize_inode", fs->io);
220 retval = fix_resize_inode(rfs->new_fs);
221 if (retval)
222 goto errout;
223 print_resource_track(rfs, &rtrack, fs->io);
224
225 init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
226 retval = fix_sb_journal_backup(rfs->new_fs);
227 if (retval)
228 goto errout;
229 print_resource_track(rfs, &rtrack, fs->io);
230
231 retval = ext2fs_set_gdt_csum(rfs->new_fs);
232 if (retval)
233 goto errout;
234
235 rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
236 rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
237
238 print_resource_track(rfs, &overall_track, fs->io);
239 retval = ext2fs_close_free(&rfs->new_fs);
240 if (retval)
241 goto errout;
242
243 rfs->flags = flags;
244
245 ext2fs_free(rfs->old_fs);
246 rfs->old_fs = NULL;
247 if (rfs->itable_buf)
248 ext2fs_free_mem(&rfs->itable_buf);
249 if (rfs->reserve_blocks)
250 ext2fs_free_block_bitmap(rfs->reserve_blocks);
251 if (rfs->move_blocks)
252 ext2fs_free_block_bitmap(rfs->move_blocks);
253 ext2fs_free_mem(&rfs);
254
255 return 0;
256
257 errout:
258 if (rfs->new_fs) {
259 ext2fs_free(rfs->new_fs);
260 rfs->new_fs = NULL;
261 }
262 if (rfs->itable_buf)
263 ext2fs_free_mem(&rfs->itable_buf);
264 ext2fs_free_mem(&rfs);
265 return retval;
266 }
267
268 /* Keep the size of the group descriptor region constant */
269 static void adjust_reserved_gdt_blocks(ext2_filsys old_fs, ext2_filsys fs)
270 {
271 if (ext2fs_has_feature_resize_inode(fs->super) &&
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 */
286 static 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) {
303 ext2fs_clear_feature_64bit(rfs->new_fs->super);
304 rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE;
305 } else if (rfs->flags & RESIZE_ENABLE_64BIT) {
306 ext2fs_set_feature_64bit(rfs->new_fs->super);
307 rfs->new_fs->super->s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
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 = (char *)n + EXT2_DESC_SIZE(rfs->new_fs->super);
333 o = (char *)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. */
348 static 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
368 if (ext2fs_has_feature_meta_bg(rfs->old_fs->super)) {
369 old_desc_blocks = rfs->old_fs->super->s_first_meta_bg;
370 new_desc_blocks = rfs->new_fs->super->s_first_meta_bg;
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);
465 out:
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 */
474 static 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. */
512 static 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_HURD)
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
572 out:
573 if (inode)
574 ext2fs_free_mem(&inode);
575 if (scan)
576 ext2fs_close_inode_scan(scan);
577 return retval;
578 }
579
580 /*
581 * Clean up the bitmaps for uninitialized bitmaps
582 */
583 static void fix_uninit_block_bitmaps(ext2_filsys fs)
584 {
585 blk64_t blk, lblk;
586 dgrp_t g;
587 unsigned int i;
588
589 if (!ext2fs_has_group_desc_csum(fs))
590 return;
591
592 for (g=0; g < fs->group_desc_count; g++) {
593 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
594 continue;
595
596 blk = ext2fs_group_first_block2(fs, g);
597 lblk = ext2fs_group_last_block2(fs, g);
598 ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
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 < fs->inode_blocks_per_group;
608 i++, blk++)
609 ext2fs_mark_block_bitmap2(fs->block_map, blk);
610 }
611 }
612
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
624 /*
625 * If the group descriptor's bitmap and inode table blocks are valid,
626 * release them in the new filesystem data structure, and mark them as
627 * reserved so the old inode table blocks don't get overwritten.
628 */
629 static errcode_t free_gdp_blocks(ext2_filsys fs,
630 ext2fs_block_bitmap reserve_blocks,
631 ext2_filsys old_fs,
632 dgrp_t group)
633 {
634 blk64_t blk;
635 unsigned int j;
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;
646
647 retval = mark_table_blocks(fs, bg_map);
648 if (retval)
649 goto out;
650 }
651
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 }
660
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 }
668
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 }
678 }
679
680 out:
681 if (bg_map)
682 ext2fs_free_block_bitmap(bg_map);
683 return retval;
684 }
685
686 /*
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.
689 */
690 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
691 ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
692 {
693 errcode_t retval;
694 blk64_t overhead = 0;
695 blk64_t rem;
696 blk64_t blk, group_block;
697 blk64_t real_end;
698 blk64_t old_numblocks, numblocks, adjblocks;
699 unsigned long i, j, old_desc_blocks;
700 unsigned int meta_bg, meta_bg_size;
701 int has_super, csum_flag, has_bg;
702 unsigned long long new_inodes; /* u64 to check for overflow */
703 double percent;
704
705 ext2fs_blocks_count_set(fs->super, new_size);
706
707 retry:
708 fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
709 fs->super->s_first_data_block,
710 EXT2_BLOCKS_PER_GROUP(fs->super));
711 if (fs->group_desc_count == 0)
712 return EXT2_ET_TOOSMALL;
713 fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
714 EXT2_DESC_PER_BLOCK(fs->super));
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.
721 */
722 overhead = (int) (2 + fs->inode_blocks_per_group);
723
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)
737 overhead += 1 + fs->desc_blocks +
738 fs->super->s_reserved_gdt_blocks;
739
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 */
745 rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
746 fs->super->s_blocks_per_group;
747 if ((fs->group_desc_count == 1) && rem && (rem < overhead))
748 return EXT2_ET_TOOSMALL;
749 if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
750 ext2fs_blocks_count_set(fs->super,
751 ext2fs_blocks_count(fs->super) - rem);
752 goto retry;
753 }
754 /*
755 * Adjust the number of inodes
756 */
757 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
758 if (new_inodes > ~0U) {
759 fprintf(stderr, _("inodes (%llu) must be less than %u\n"),
760 new_inodes, ~0U);
761 return EXT2_ET_TOO_MANY_INODES;
762 }
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 */
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)));
774 else
775 ext2fs_free_blocks_count_set(fs->super,
776 ext2fs_free_blocks_count(fs->super) +
777 (ext2fs_blocks_count(fs->super) - blk));
778
779 /*
780 * Adjust the number of reserved blocks
781 */
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));
787
788 /*
789 * Adjust the bitmaps for size
790 */
791 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
792 fs->super->s_inodes_count,
793 fs->inode_map);
794 if (retval) goto errout;
795
796 real_end = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count) - 1 +
797 fs->super->s_first_data_block;
798 retval = ext2fs_resize_block_bitmap2(new_size - 1,
799 real_end, fs->block_map);
800 if (retval) goto errout;
801
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
812 /*
813 * Reallocate the group descriptors as necessary.
814 */
815 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super) &&
816 old_fs->desc_blocks != fs->desc_blocks) {
817 retval = ext2fs_resize_mem(old_fs->desc_blocks *
818 fs->blocksize,
819 fs->desc_blocks * fs->blocksize,
820 &fs->group_desc);
821 if (retval)
822 goto errout;
823 if (fs->desc_blocks > old_fs->desc_blocks)
824 memset((char *) fs->group_desc +
825 (old_fs->desc_blocks * fs->blocksize), 0,
826 (fs->desc_blocks - old_fs->desc_blocks) *
827 fs->blocksize);
828 }
829
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.
835 *
836 * Note: If we're converting to 64bit mode, we did this earlier.
837 */
838 if (EXT2_DESC_SIZE(old_fs->super) == EXT2_DESC_SIZE(fs->super))
839 adjust_reserved_gdt_blocks(old_fs, fs);
840
841 if (ext2fs_has_feature_meta_bg(fs->super) &&
842 (fs->super->s_first_meta_bg > fs->desc_blocks)) {
843 ext2fs_clear_feature_meta_bg(fs->super);
844 fs->super->s_first_meta_bg = 0;
845 }
846
847 /*
848 * Update the location of the backup superblocks if the
849 * sparse_super2 feature is enabled.
850 */
851 if (ext2fs_has_feature_sparse_super2(fs->super)) {
852 dgrp_t last_bg = fs->group_desc_count - 1;
853 dgrp_t old_last_bg = old_fs->group_desc_count - 1;
854
855 if (last_bg > old_last_bg) {
856 if (old_fs->group_desc_count == 1)
857 fs->super->s_backup_bgs[0] = 1;
858 if ((old_fs->group_desc_count < 3 &&
859 fs->group_desc_count > 2) ||
860 fs->super->s_backup_bgs[1])
861 fs->super->s_backup_bgs[1] = last_bg;
862 } else if (last_bg < old_last_bg) {
863 if (fs->super->s_backup_bgs[0] > last_bg)
864 fs->super->s_backup_bgs[0] = 0;
865 if (fs->super->s_backup_bgs[1] > last_bg)
866 fs->super->s_backup_bgs[1] = 0;
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
873 /*
874 * If we are shrinking the number of block groups, we're done
875 * and can exit now.
876 */
877 if (old_fs->group_desc_count > fs->group_desc_count) {
878 /*
879 * Check the block groups that we are chopping off
880 * and free any blocks associated with their metadata
881 */
882 retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
883 fs->group_desc_count);
884 goto errout;
885 }
886
887 /*
888 * Fix the count of the last (old) block group
889 */
890 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
891 old_fs->super->s_first_data_block) %
892 old_fs->super->s_blocks_per_group;
893 if (!old_numblocks)
894 old_numblocks = old_fs->super->s_blocks_per_group;
895 if (old_fs->group_desc_count == fs->group_desc_count) {
896 numblocks = (ext2fs_blocks_count(fs->super) -
897 fs->super->s_first_data_block) %
898 fs->super->s_blocks_per_group;
899 if (!numblocks)
900 numblocks = fs->super->s_blocks_per_group;
901 } else
902 numblocks = fs->super->s_blocks_per_group;
903 i = old_fs->group_desc_count - 1;
904 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
905 ext2fs_group_desc_csum_set(fs, i);
906
907 /*
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.)
911 */
912 if (old_fs->group_desc_count >= fs->group_desc_count) {
913 retval = 0;
914 goto errout;
915 }
916
917 /*
918 * Initialize the new block group descriptors
919 */
920 group_block = ext2fs_group_first_block2(fs,
921 old_fs->group_desc_count);
922 csum_flag = ext2fs_has_group_desc_csum(fs);
923 if (getenv("RESIZE2FS_FORCE_LAZY_ITABLE_INIT") ||
924 (!getenv("RESIZE2FS_FORCE_ITABLE_INIT") &&
925 access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0))
926 lazy_itable_init = 1;
927 if (ext2fs_has_feature_meta_bg(fs->super))
928 old_desc_blocks = fs->super->s_first_meta_bg;
929 else
930 old_desc_blocks = fs->desc_blocks +
931 fs->super->s_reserved_gdt_blocks;
932
933 /*
934 * If we changed the number of block_group descriptor blocks,
935 * we need to make sure they are all marked as reserved in the
936 * filesystem's block allocation map.
937 */
938 for (i = 0; i < old_fs->group_desc_count; i++)
939 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
940
941 for (i = old_fs->group_desc_count;
942 i < fs->group_desc_count; i++) {
943 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
944 sizeof(struct ext2_group_desc));
945 adjblocks = 0;
946
947 ext2fs_bg_flags_zap(fs, i);
948 if (csum_flag) {
949 ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
950 if (!lazy_itable_init)
951 ext2fs_bg_flags_set(fs, i,
952 EXT2_BG_INODE_ZEROED);
953 ext2fs_bg_itable_unused_set(fs, i,
954 fs->super->s_inodes_per_group);
955 }
956
957 numblocks = ext2fs_group_blocks_count(fs, i);
958 if ((i < fs->group_desc_count - 1) && csum_flag)
959 ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
960
961 has_super = ext2fs_bg_has_super(fs, i);
962 if (has_super) {
963 ext2fs_block_alloc_stats2(fs, group_block, +1);
964 adjblocks++;
965 }
966 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
967 meta_bg = i / meta_bg_size;
968 if (!ext2fs_has_feature_meta_bg(fs->super) ||
969 (meta_bg < fs->super->s_first_meta_bg)) {
970 if (has_super) {
971 for (j=0; j < old_desc_blocks; j++)
972 ext2fs_block_alloc_stats2(fs,
973 group_block + 1 + j, +1);
974 adjblocks += old_desc_blocks;
975 }
976 } else {
977 if (has_super)
978 has_super = 1;
979 if (((i % meta_bg_size) == 0) ||
980 ((i % meta_bg_size) == 1) ||
981 ((i % meta_bg_size) == (meta_bg_size-1)))
982 ext2fs_block_alloc_stats2(fs,
983 group_block + has_super, +1);
984 }
985
986 adjblocks += 2 + fs->inode_blocks_per_group;
987
988 numblocks -= adjblocks;
989 ext2fs_free_blocks_count_set(fs->super,
990 ext2fs_free_blocks_count(fs->super) - adjblocks);
991 fs->super->s_free_inodes_count +=
992 fs->super->s_inodes_per_group;
993 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
994 ext2fs_bg_free_inodes_count_set(fs, i,
995 fs->super->s_inodes_per_group);
996 ext2fs_bg_used_dirs_count_set(fs, i, 0);
997 ext2fs_group_desc_csum_set(fs, i);
998
999 retval = ext2fs_allocate_group_table(fs, i, 0);
1000 if (retval) goto errout;
1001
1002 group_block += fs->super->s_blocks_per_group;
1003 }
1004 retval = 0;
1005
1006 /*
1007 * Mark all of the metadata blocks as reserved so they won't
1008 * get allocated by the call to ext2fs_allocate_group_table()
1009 * in blocks_to_move(), where we allocate new blocks to
1010 * replace those allocation bitmap and inode table blocks
1011 * which have to get relocated to make space for an increased
1012 * number of the block group descriptors.
1013 */
1014 if (reserve_blocks)
1015 mark_table_blocks(fs, reserve_blocks);
1016
1017 errout:
1018 return (retval);
1019 }
1020
1021 /*
1022 * This routine adjusts the superblock and other data structures, both
1023 * in disk as well as in memory...
1024 */
1025 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
1026 {
1027 ext2_filsys fs = rfs->new_fs;
1028 int adj = 0;
1029 errcode_t retval;
1030 blk64_t group_block;
1031 unsigned long i;
1032 unsigned long max_group;
1033
1034 ext2fs_mark_super_dirty(fs);
1035 ext2fs_mark_bb_dirty(fs);
1036 ext2fs_mark_ib_dirty(fs);
1037
1038 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
1039 &rfs->reserve_blocks);
1040 if (retval)
1041 return retval;
1042
1043 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
1044 if (retval)
1045 goto errout;
1046
1047 /*
1048 * Check to make sure there are enough inodes
1049 */
1050 if ((rfs->old_fs->super->s_inodes_count -
1051 rfs->old_fs->super->s_free_inodes_count) >
1052 rfs->new_fs->super->s_inodes_count) {
1053 retval = ENOSPC;
1054 goto errout;
1055 }
1056
1057 /*
1058 * If we are shrinking the number block groups, we're done and
1059 * can exit now.
1060 */
1061 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
1062 retval = 0;
1063 goto errout;
1064 }
1065
1066 /*
1067 * If the number of block groups is staying the same, we're
1068 * done and can exit now. (If the number block groups is
1069 * shrinking, we had exited earlier.)
1070 */
1071 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
1072 retval = 0;
1073 goto errout;
1074 }
1075
1076 /*
1077 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
1078 * supports lazy inode initialization, we can skip
1079 * initializing the inode table.
1080 */
1081 if (lazy_itable_init && ext2fs_has_group_desc_csum(fs)) {
1082 retval = 0;
1083 goto errout;
1084 }
1085
1086 /*
1087 * Initialize the inode table
1088 */
1089 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
1090 &rfs->itable_buf);
1091 if (retval)
1092 goto errout;
1093
1094 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
1095 group_block = ext2fs_group_first_block2(fs,
1096 rfs->old_fs->group_desc_count);
1097 adj = rfs->old_fs->group_desc_count;
1098 max_group = fs->group_desc_count - adj;
1099 if (rfs->progress) {
1100 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1101 0, max_group);
1102 if (retval)
1103 goto errout;
1104 }
1105 for (i = rfs->old_fs->group_desc_count;
1106 i < fs->group_desc_count; i++) {
1107 /*
1108 * Write out the new inode table
1109 */
1110 retval = ext2fs_zero_blocks2(fs, ext2fs_inode_table_loc(fs, i),
1111 fs->inode_blocks_per_group, NULL,
1112 NULL);
1113 if (retval)
1114 goto errout;
1115
1116 io_channel_flush(fs->io);
1117 if (rfs->progress) {
1118 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
1119 i - adj + 1, max_group);
1120 if (retval)
1121 goto errout;
1122 }
1123 group_block += fs->super->s_blocks_per_group;
1124 }
1125 io_channel_flush(fs->io);
1126 retval = 0;
1127
1128 errout:
1129 return retval;
1130 }
1131
1132 /* --------------------------------------------------------------------
1133 *
1134 * Resize processing, phase 2.
1135 *
1136 * In this phase we adjust determine which blocks need to be moved, in
1137 * blocks_to_move(). We then copy the blocks to their ultimate new
1138 * destinations using block_mover(). Since we are copying blocks to
1139 * their new locations, again during this pass we can abort without
1140 * any problems.
1141 * --------------------------------------------------------------------
1142 */
1143
1144 /*
1145 * This helper function creates a block bitmap with all of the
1146 * filesystem meta-data blocks.
1147 */
1148 static errcode_t mark_table_blocks(ext2_filsys fs,
1149 ext2fs_block_bitmap bmap)
1150 {
1151 dgrp_t i;
1152 blk64_t blk;
1153
1154 for (i = 0; i < fs->group_desc_count; i++) {
1155 ext2fs_reserve_super_and_bgd(fs, i, bmap);
1156
1157 /*
1158 * Mark the blocks used for the inode table
1159 */
1160 blk = ext2fs_inode_table_loc(fs, i);
1161 if (blk)
1162 ext2fs_mark_block_bitmap_range2(bmap, blk,
1163 fs->inode_blocks_per_group);
1164
1165 /*
1166 * Mark block used for the block bitmap
1167 */
1168 blk = ext2fs_block_bitmap_loc(fs, i);
1169 if (blk)
1170 ext2fs_mark_block_bitmap2(bmap, blk);
1171
1172 /*
1173 * Mark block used for the inode bitmap
1174 */
1175 blk = ext2fs_inode_bitmap_loc(fs, i);
1176 if (blk)
1177 ext2fs_mark_block_bitmap2(bmap, blk);
1178 }
1179 return 0;
1180 }
1181
1182 /*
1183 * This function checks to see if a particular block (either a
1184 * superblock or a block group descriptor) overlaps with an inode or
1185 * block bitmap block, or with the inode table.
1186 */
1187 static void mark_fs_metablock(ext2_resize_t rfs,
1188 ext2fs_block_bitmap meta_bmap,
1189 int group, blk64_t blk)
1190 {
1191 ext2_filsys fs = rfs->new_fs;
1192
1193 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1194 ext2fs_block_alloc_stats2(fs, blk, +1);
1195
1196 /*
1197 * Check to see if we overlap with the inode or block bitmap,
1198 * or the inode tables. If not, and the block is in use, then
1199 * mark it as a block to be moved.
1200 */
1201 if (is_block_bm(fs, group, blk)) {
1202 ext2fs_block_bitmap_loc_set(fs, group, 0);
1203 rfs->needed_blocks++;
1204 return;
1205 }
1206 if (is_inode_bm(fs, group, blk)) {
1207 ext2fs_inode_bitmap_loc_set(fs, group, 0);
1208 rfs->needed_blocks++;
1209 return;
1210 }
1211 if (is_inode_tb(fs, group, blk)) {
1212 ext2fs_inode_table_loc_set(fs, group, 0);
1213 rfs->needed_blocks++;
1214 return;
1215 }
1216 if (ext2fs_has_feature_flex_bg(fs->super)) {
1217 dgrp_t i;
1218
1219 for (i = 0; i < rfs->old_fs->group_desc_count; i++) {
1220 if (is_block_bm(fs, i, blk)) {
1221 ext2fs_block_bitmap_loc_set(fs, i, 0);
1222 rfs->needed_blocks++;
1223 return;
1224 }
1225 if (is_inode_bm(fs, i, blk)) {
1226 ext2fs_inode_bitmap_loc_set(fs, i, 0);
1227 rfs->needed_blocks++;
1228 return;
1229 }
1230 if (is_inode_tb(fs, i, blk)) {
1231 ext2fs_inode_table_loc_set(fs, i, 0);
1232 rfs->needed_blocks++;
1233 return;
1234 }
1235 }
1236 }
1237
1238 if (ext2fs_has_group_desc_csum(fs) &&
1239 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
1240 /*
1241 * If the block bitmap is uninitialized, which means
1242 * nothing other than standard metadata in use.
1243 */
1244 return;
1245 } else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
1246 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1247 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1248 rfs->needed_blocks++;
1249 }
1250 }
1251
1252
1253 /*
1254 * This routine marks and unmarks reserved blocks in the new block
1255 * bitmap. It also determines which blocks need to be moved and
1256 * places this information into the move_blocks bitmap.
1257 */
1258 static errcode_t blocks_to_move(ext2_resize_t rfs)
1259 {
1260 unsigned int j;
1261 int has_super;
1262 dgrp_t i, max_groups, g;
1263 blk64_t blk, group_blk;
1264 blk64_t old_blocks, new_blocks, group_end, cluster_freed;
1265 blk64_t new_size;
1266 unsigned int meta_bg, meta_bg_size;
1267 errcode_t retval;
1268 ext2_filsys fs, old_fs;
1269 ext2fs_block_bitmap meta_bmap, new_meta_bmap = NULL;
1270 int flex_bg;
1271
1272 fs = rfs->new_fs;
1273 old_fs = rfs->old_fs;
1274 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
1275 fs = rfs->old_fs;
1276
1277 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
1278 &rfs->move_blocks);
1279 if (retval)
1280 return retval;
1281
1282 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
1283 &meta_bmap);
1284 if (retval)
1285 return retval;
1286
1287 retval = mark_table_blocks(old_fs, meta_bmap);
1288 if (retval)
1289 return retval;
1290
1291 fs = rfs->new_fs;
1292
1293 /*
1294 * If we're shrinking the filesystem, we need to move any
1295 * group's metadata blocks (either allocation bitmaps or the
1296 * inode table) which are beyond the end of the new
1297 * filesystem.
1298 */
1299 new_size = ext2fs_blocks_count(fs->super);
1300 if (new_size < ext2fs_blocks_count(old_fs->super)) {
1301 for (g = 0; g < fs->group_desc_count; g++) {
1302 int realloc = 0;
1303 /*
1304 * ext2fs_allocate_group_table will re-allocate any
1305 * metadata blocks whose location is set to zero.
1306 */
1307 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
1308 ext2fs_block_bitmap_loc_set(fs, g, 0);
1309 realloc = 1;
1310 }
1311 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
1312 ext2fs_inode_bitmap_loc_set(fs, g, 0);
1313 realloc = 1;
1314 }
1315 if ((ext2fs_inode_table_loc(fs, g) +
1316 fs->inode_blocks_per_group) > new_size) {
1317 ext2fs_inode_table_loc_set(fs, g, 0);
1318 realloc = 1;
1319 }
1320
1321 if (realloc) {
1322 retval = ext2fs_allocate_group_table(fs, g, 0);
1323 if (retval)
1324 return retval;
1325 }
1326 }
1327 }
1328
1329 /*
1330 * If we're shrinking the filesystem, we need to move all of
1331 * the blocks that don't fit any more
1332 */
1333 for (blk = ext2fs_blocks_count(fs->super);
1334 blk < ext2fs_blocks_count(old_fs->super); blk++) {
1335 g = ext2fs_group_of_blk2(fs, blk);
1336 if (ext2fs_has_group_desc_csum(fs) &&
1337 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
1338 /*
1339 * The block bitmap is uninitialized, so skip
1340 * to the next block group.
1341 */
1342 blk = ext2fs_group_first_block2(fs, g+1) - 1;
1343 continue;
1344 }
1345 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1346 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
1347 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
1348 rfs->needed_blocks++;
1349 }
1350 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1351 }
1352
1353 if (ext2fs_has_feature_meta_bg(old_fs->super))
1354 old_blocks = old_fs->super->s_first_meta_bg;
1355 else
1356 old_blocks = old_fs->desc_blocks +
1357 old_fs->super->s_reserved_gdt_blocks;
1358 if (ext2fs_has_feature_meta_bg(fs->super))
1359 new_blocks = fs->super->s_first_meta_bg;
1360 else
1361 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
1362
1363 retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
1364 if (retval)
1365 goto errout;
1366
1367 if (EXT2_DESC_SIZE(rfs->old_fs->super) ==
1368 EXT2_DESC_SIZE(rfs->new_fs->super) &&
1369 old_blocks == new_blocks) {
1370 retval = 0;
1371 goto errout;
1372 }
1373
1374 max_groups = fs->group_desc_count;
1375 if (max_groups > old_fs->group_desc_count)
1376 max_groups = old_fs->group_desc_count;
1377 group_blk = old_fs->super->s_first_data_block;
1378 /*
1379 * If we're reducing the number of descriptor blocks, this
1380 * makes life easy. :-) We just have to mark some extra
1381 * blocks as free.
1382 */
1383 if (old_blocks > new_blocks) {
1384 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
1385 retval = ext2fs_allocate_block_bitmap(fs,
1386 _("new meta blocks"),
1387 &new_meta_bmap);
1388 if (retval)
1389 goto errout;
1390
1391 retval = mark_table_blocks(fs, new_meta_bmap);
1392 if (retval)
1393 goto errout;
1394 }
1395
1396 for (i = 0; i < max_groups; i++) {
1397 if (!ext2fs_bg_has_super(old_fs, i)) {
1398 group_blk += fs->super->s_blocks_per_group;
1399 continue;
1400 }
1401 group_end = group_blk + 1 + old_blocks;
1402 for (blk = group_blk + 1 + new_blocks;
1403 blk < group_end;) {
1404 if (new_meta_bmap == NULL ||
1405 !ext2fs_test_block_bitmap2(new_meta_bmap,
1406 blk)) {
1407 cluster_freed =
1408 EXT2FS_CLUSTER_RATIO(fs) -
1409 (blk &
1410 EXT2FS_CLUSTER_MASK(fs));
1411 if (cluster_freed > group_end - blk)
1412 cluster_freed = group_end - blk;
1413 ext2fs_block_alloc_stats2(fs, blk, -1);
1414 blk += EXT2FS_CLUSTER_RATIO(fs);
1415 rfs->needed_blocks -= cluster_freed;
1416 continue;
1417 }
1418 rfs->needed_blocks--;
1419 blk++;
1420 }
1421 group_blk += fs->super->s_blocks_per_group;
1422 }
1423 retval = 0;
1424 goto errout;
1425 }
1426 /*
1427 * If we're increasing the number of descriptor blocks, life
1428 * gets interesting....
1429 */
1430 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
1431 flex_bg = ext2fs_has_feature_flex_bg(fs->super);
1432 /* first reserve all of the existing fs meta blocks */
1433 for (i = 0; i < max_groups; i++) {
1434 has_super = ext2fs_bg_has_super(fs, i);
1435 if (has_super)
1436 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
1437
1438 meta_bg = i / meta_bg_size;
1439 if (!ext2fs_has_feature_meta_bg(fs->super) ||
1440 (meta_bg < fs->super->s_first_meta_bg)) {
1441 if (has_super) {
1442 for (blk = group_blk+1;
1443 blk < group_blk + 1 + new_blocks; blk++)
1444 mark_fs_metablock(rfs, meta_bmap,
1445 i, blk);
1446 }
1447 } else {
1448 if (has_super)
1449 has_super = 1;
1450 if (((i % meta_bg_size) == 0) ||
1451 ((i % meta_bg_size) == 1) ||
1452 ((i % meta_bg_size) == (meta_bg_size-1)))
1453 mark_fs_metablock(rfs, meta_bmap, i,
1454 group_blk + has_super);
1455 }
1456
1457 /*
1458 * Reserve the existing meta blocks that we know
1459 * aren't to be moved.
1460 *
1461 * For flex_bg file systems, in order to avoid
1462 * overwriting fs metadata (especially inode table
1463 * blocks) belonging to a different block group when
1464 * we are relocating the inode tables, we need to
1465 * reserve all existing fs metadata blocks.
1466 */
1467 if (ext2fs_block_bitmap_loc(fs, i))
1468 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1469 ext2fs_block_bitmap_loc(fs, i));
1470 else if (flex_bg && i < old_fs->group_desc_count)
1471 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1472 ext2fs_block_bitmap_loc(old_fs, i));
1473
1474 if (ext2fs_inode_bitmap_loc(fs, i))
1475 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1476 ext2fs_inode_bitmap_loc(fs, i));
1477 else if (flex_bg && i < old_fs->group_desc_count)
1478 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1479 ext2fs_inode_bitmap_loc(old_fs, i));
1480
1481 if (ext2fs_inode_table_loc(fs, i))
1482 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1483 ext2fs_inode_table_loc(fs, i),
1484 fs->inode_blocks_per_group);
1485 else if (flex_bg && i < old_fs->group_desc_count)
1486 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1487 ext2fs_inode_table_loc(old_fs, i),
1488 old_fs->inode_blocks_per_group);
1489
1490 group_blk += rfs->new_fs->super->s_blocks_per_group;
1491 }
1492
1493 /* Allocate the missing data structures */
1494 for (i = 0; i < max_groups; i++) {
1495 if (ext2fs_inode_table_loc(fs, i) &&
1496 ext2fs_inode_bitmap_loc(fs, i) &&
1497 ext2fs_block_bitmap_loc(fs, i))
1498 continue;
1499
1500 retval = ext2fs_allocate_group_table(fs, i,
1501 rfs->reserve_blocks);
1502 if (retval)
1503 goto errout;
1504
1505 /*
1506 * For those structures that have changed, we need to
1507 * do bookkeeping.
1508 */
1509 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1510 (blk = ext2fs_block_bitmap_loc(fs, i))) {
1511 ext2fs_block_alloc_stats2(fs, blk, +1);
1512 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1513 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1514 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1515 blk);
1516 }
1517 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1518 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1519 ext2fs_block_alloc_stats2(fs, blk, +1);
1520 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1521 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1522 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1523 blk);
1524 }
1525
1526 /*
1527 * The inode table, if we need to relocate it, is
1528 * handled specially. We have to reserve the blocks
1529 * for both the old and the new inode table, since we
1530 * can't have the inode table be destroyed during the
1531 * block relocation phase.
1532 */
1533 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1534 continue; /* inode table not moved */
1535
1536 rfs->needed_blocks += fs->inode_blocks_per_group;
1537
1538 /*
1539 * Mark the new inode table as in use in the new block
1540 * allocation bitmap, and move any blocks that might
1541 * be necessary.
1542 */
1543 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1544 j < fs->inode_blocks_per_group ; j++, blk++) {
1545 ext2fs_block_alloc_stats2(fs, blk, +1);
1546 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1547 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1548 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1549 blk);
1550 }
1551
1552 /*
1553 * Make sure the old inode table is reserved in the
1554 * block reservation bitmap.
1555 */
1556 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1557 j < fs->inode_blocks_per_group ; j++, blk++)
1558 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1559 }
1560 retval = 0;
1561
1562 errout:
1563 if (new_meta_bmap)
1564 ext2fs_free_block_bitmap(new_meta_bmap);
1565 if (meta_bmap)
1566 ext2fs_free_block_bitmap(meta_bmap);
1567
1568 return retval;
1569 }
1570
1571 /*
1572 * This helper function tries to allocate a new block. We try to
1573 * avoid hitting the original group descriptor blocks at least at
1574 * first, since we want to make it possible to recover from a badly
1575 * aborted resize operation as much as possible.
1576 *
1577 * In the future, I may further modify this routine to balance out
1578 * where we get the new blocks across the various block groups.
1579 * Ideally we would allocate blocks that corresponded with the block
1580 * group of the containing inode, and keep contiguous blocks
1581 * together. However, this very difficult to do efficiently, since we
1582 * don't have the necessary information up front.
1583 */
1584
1585 #define AVOID_OLD 1
1586 #define DESPERATION 2
1587
1588 static void init_block_alloc(ext2_resize_t rfs)
1589 {
1590 rfs->alloc_state = AVOID_OLD;
1591 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1592 #if 0
1593 /* HACK for testing */
1594 if (ext2fs_blocks_count(rfs->new_fs->super) >
1595 ext2fs_blocks_count(rfs->old_fs->super))
1596 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1597 #endif
1598 }
1599
1600 static blk64_t get_new_block(ext2_resize_t rfs)
1601 {
1602 ext2_filsys fs = rfs->new_fs;
1603
1604 while (1) {
1605 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1606 if (rfs->alloc_state == DESPERATION)
1607 return 0;
1608
1609 #ifdef RESIZE2FS_DEBUG
1610 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1611 printf("Going into desperation mode "
1612 "for block allocations\n");
1613 #endif
1614 rfs->alloc_state = DESPERATION;
1615 rfs->new_blk = fs->super->s_first_data_block;
1616 continue;
1617 }
1618 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1619 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1620 rfs->new_blk) ||
1621 ((rfs->alloc_state == AVOID_OLD) &&
1622 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1623 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1624 rfs->new_blk))) {
1625 rfs->new_blk++;
1626 continue;
1627 }
1628 return rfs->new_blk;
1629 }
1630 }
1631
1632 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
1633 blk64_t goal EXT2FS_ATTR((unused)),
1634 blk64_t *ret)
1635 {
1636 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1637 blk64_t blk;
1638 int group;
1639
1640 blk = get_new_block(rfs);
1641 if (!blk)
1642 return ENOSPC;
1643
1644 #ifdef RESIZE2FS_DEBUG
1645 if (rfs->flags & 0xF)
1646 printf("get_alloc_block allocating %llu\n", blk);
1647 #endif
1648
1649 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1650 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1651
1652 group = ext2fs_group_of_blk2(rfs->old_fs, blk);
1653 ext2fs_clear_block_uninit(rfs->old_fs, group);
1654 group = ext2fs_group_of_blk2(rfs->new_fs, blk);
1655 ext2fs_clear_block_uninit(rfs->new_fs, group);
1656
1657 *ret = (blk64_t) blk;
1658 return 0;
1659 }
1660
1661 static errcode_t block_mover(ext2_resize_t rfs)
1662 {
1663 blk64_t blk, old_blk, new_blk;
1664 ext2_filsys fs = rfs->new_fs;
1665 ext2_filsys old_fs = rfs->old_fs;
1666 errcode_t retval;
1667 __u64 c, size;
1668 int to_move, moved;
1669 ext2_badblocks_list badblock_list = 0;
1670 int bb_modified = 0;
1671
1672 fs->get_alloc_block = resize2fs_get_alloc_block;
1673 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1674
1675 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1676 if (retval)
1677 return retval;
1678
1679 new_blk = fs->super->s_first_data_block;
1680 if (!rfs->itable_buf) {
1681 retval = ext2fs_get_array(fs->blocksize,
1682 fs->inode_blocks_per_group,
1683 &rfs->itable_buf);
1684 if (retval)
1685 return retval;
1686 }
1687 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1688 if (retval)
1689 return retval;
1690
1691 /*
1692 * The first step is to figure out where all of the blocks
1693 * will go.
1694 */
1695 to_move = moved = 0;
1696 init_block_alloc(rfs);
1697 for (blk = B2C(old_fs->super->s_first_data_block);
1698 blk < ext2fs_blocks_count(old_fs->super);
1699 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1700 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1701 continue;
1702 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1703 continue;
1704 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1705 ext2fs_badblocks_list_del(badblock_list, blk);
1706 bb_modified++;
1707 continue;
1708 }
1709
1710 new_blk = get_new_block(rfs);
1711 if (!new_blk) {
1712 retval = ENOSPC;
1713 goto errout;
1714 }
1715 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1716 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1717 to_move++;
1718 }
1719
1720 if (to_move == 0) {
1721 if (rfs->bmap) {
1722 ext2fs_free_extent_table(rfs->bmap);
1723 rfs->bmap = 0;
1724 }
1725 retval = 0;
1726 goto errout;
1727 }
1728
1729 /*
1730 * Step two is to actually move the blocks
1731 */
1732 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1733 if (retval) goto errout;
1734
1735 if (rfs->progress) {
1736 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1737 0, to_move);
1738 if (retval)
1739 goto errout;
1740 }
1741 while (1) {
1742 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1743 if (retval) goto errout;
1744 if (!size)
1745 break;
1746 old_blk = C2B(old_blk);
1747 new_blk = C2B(new_blk);
1748 size = C2B(size);
1749 #ifdef RESIZE2FS_DEBUG
1750 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1751 printf("Moving %llu blocks %llu->%llu\n",
1752 size, old_blk, new_blk);
1753 #endif
1754 do {
1755 c = size;
1756 if (c > fs->inode_blocks_per_group)
1757 c = fs->inode_blocks_per_group;
1758 retval = io_channel_read_blk64(fs->io, old_blk, c,
1759 rfs->itable_buf);
1760 if (retval) goto errout;
1761 retval = io_channel_write_blk64(fs->io, new_blk, c,
1762 rfs->itable_buf);
1763 if (retval) goto errout;
1764 size -= c;
1765 new_blk += c;
1766 old_blk += c;
1767 moved += c;
1768 if (rfs->progress) {
1769 io_channel_flush(fs->io);
1770 retval = (rfs->progress)(rfs,
1771 E2_RSZ_BLOCK_RELOC_PASS,
1772 moved, to_move);
1773 if (retval)
1774 goto errout;
1775 }
1776 } while (size > 0);
1777 io_channel_flush(fs->io);
1778 }
1779
1780 errout:
1781 if (badblock_list) {
1782 if (!retval && bb_modified)
1783 retval = ext2fs_update_bb_inode(old_fs,
1784 badblock_list);
1785 ext2fs_badblocks_list_free(badblock_list);
1786 }
1787 return retval;
1788 }
1789
1790
1791 /* --------------------------------------------------------------------
1792 *
1793 * Resize processing, phase 3
1794 *
1795 * --------------------------------------------------------------------
1796 */
1797
1798
1799 /*
1800 * The extent translation table is stored in clusters so we need to
1801 * take special care when mapping a source block number to its
1802 * destination block number.
1803 */
1804 static __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1805 {
1806 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1807
1808 if (new_block != 0)
1809 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1810 return new_block;
1811 }
1812
1813 struct process_block_struct {
1814 ext2_resize_t rfs;
1815 ext2_ino_t ino;
1816 ext2_ino_t old_ino;
1817 struct ext2_inode * inode;
1818 errcode_t error;
1819 int is_dir;
1820 int changed;
1821 int has_extents;
1822 };
1823
1824 static int process_block(ext2_filsys fs, blk64_t *block_nr,
1825 e2_blkcnt_t blockcnt,
1826 blk64_t ref_block EXT2FS_ATTR((unused)),
1827 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1828 {
1829 struct process_block_struct *pb;
1830 errcode_t retval;
1831 blk64_t block, new_block;
1832 int ret = 0;
1833
1834 pb = (struct process_block_struct *) priv_data;
1835 block = *block_nr;
1836 if (pb->rfs->bmap) {
1837 new_block = extent_translate(fs, pb->rfs->bmap, block);
1838 if (new_block) {
1839 *block_nr = new_block;
1840 ret |= BLOCK_CHANGED;
1841 pb->changed = 1;
1842 #ifdef RESIZE2FS_DEBUG
1843 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1844 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1845 pb->old_ino, blockcnt, block,
1846 new_block);
1847 #endif
1848 block = new_block;
1849 }
1850 }
1851
1852 if (pb->is_dir) {
1853 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1854 block, (int) blockcnt);
1855 if (retval) {
1856 pb->error = retval;
1857 ret |= BLOCK_ABORT;
1858 }
1859 }
1860 return ret;
1861 }
1862
1863 /*
1864 * Progress callback
1865 */
1866 static errcode_t progress_callback(ext2_filsys fs,
1867 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1868 dgrp_t group, void * priv_data)
1869 {
1870 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1871 errcode_t retval;
1872
1873 /*
1874 * This check is to protect against old ext2 libraries. It
1875 * shouldn't be needed against new libraries.
1876 */
1877 if ((group+1) == 0)
1878 return 0;
1879
1880 if (rfs->progress) {
1881 io_channel_flush(fs->io);
1882 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1883 group+1, fs->group_desc_count);
1884 if (retval)
1885 return retval;
1886 }
1887
1888 return 0;
1889 }
1890
1891 static errcode_t migrate_ea_block(ext2_resize_t rfs, ext2_ino_t ino,
1892 struct ext2_inode *inode, int *changed)
1893 {
1894 char *buf = NULL;
1895 blk64_t new_block;
1896 errcode_t err = 0;
1897
1898 /* No EA block or no remapping? Quit early. */
1899 if (ext2fs_file_acl_block(rfs->old_fs, inode) == 0 || !rfs->bmap)
1900 return 0;
1901 new_block = extent_translate(rfs->old_fs, rfs->bmap,
1902 ext2fs_file_acl_block(rfs->old_fs, inode));
1903 if (new_block == 0)
1904 return 0;
1905
1906 /* Set the new ACL block */
1907 ext2fs_file_acl_block_set(rfs->old_fs, inode, new_block);
1908
1909 /* Update checksum */
1910 if (ext2fs_has_feature_metadata_csum(rfs->new_fs->super)) {
1911 err = ext2fs_get_mem(rfs->old_fs->blocksize, &buf);
1912 if (err)
1913 return err;
1914 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
1915 err = ext2fs_read_ext_attr3(rfs->old_fs, new_block, buf, ino);
1916 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
1917 if (err)
1918 goto out;
1919 err = ext2fs_write_ext_attr3(rfs->old_fs, new_block, buf, ino);
1920 if (err)
1921 goto out;
1922 }
1923 *changed = 1;
1924
1925 out:
1926 ext2fs_free_mem(&buf);
1927 return err;
1928 }
1929
1930 /* Rewrite extents */
1931 static errcode_t rewrite_extents(ext2_filsys fs, ext2_ino_t ino)
1932 {
1933 ext2_extent_handle_t handle;
1934 struct ext2fs_extent extent;
1935 errcode_t errcode;
1936 struct ext2_extent_info info;
1937
1938 errcode = ext2fs_extent_open(fs, ino, &handle);
1939 if (errcode)
1940 return errcode;
1941
1942 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent);
1943 if (errcode)
1944 goto out;
1945
1946 do {
1947 errcode = ext2fs_extent_get_info(handle, &info);
1948 if (errcode)
1949 break;
1950
1951 /*
1952 * If this is the first extent in an extent block that we
1953 * haven't visited, rewrite the extent to force the ETB
1954 * checksum to be rewritten.
1955 */
1956 if (info.curr_entry == 1 && info.curr_level != 0 &&
1957 !(extent.e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT)) {
1958 errcode = ext2fs_extent_replace(handle, 0, &extent);
1959 if (errcode)
1960 break;
1961 }
1962
1963 /* Skip to the end of a block of leaf nodes */
1964 if (extent.e_flags & EXT2_EXTENT_FLAGS_LEAF) {
1965 errcode = ext2fs_extent_get(handle,
1966 EXT2_EXTENT_LAST_SIB,
1967 &extent);
1968 if (errcode)
1969 break;
1970 }
1971
1972 errcode = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT, &extent);
1973 } while (errcode == 0);
1974
1975 out:
1976 /* Ok if we run off the end */
1977 if (errcode == EXT2_ET_EXTENT_NO_NEXT)
1978 errcode = 0;
1979 ext2fs_extent_free(handle);
1980 return errcode;
1981 }
1982
1983 static void quiet_com_err_proc(const char *whoami EXT2FS_ATTR((unused)),
1984 errcode_t code EXT2FS_ATTR((unused)),
1985 const char *fmt EXT2FS_ATTR((unused)),
1986 va_list args EXT2FS_ATTR((unused)))
1987 {
1988 }
1989
1990 static int fix_ea_entries(ext2_extent imap, struct ext2_ext_attr_entry *entry,
1991 struct ext2_ext_attr_entry *end, ext2_ino_t last_ino)
1992 {
1993 int modified = 0;
1994 ext2_ino_t new_ino;
1995
1996 while (entry < end && !EXT2_EXT_IS_LAST_ENTRY(entry)) {
1997 if (entry->e_value_inum > last_ino) {
1998 new_ino = ext2fs_extent_translate(imap,
1999 entry->e_value_inum);
2000 entry->e_value_inum = new_ino;
2001 modified = 1;
2002 }
2003 entry = EXT2_EXT_ATTR_NEXT(entry);
2004 }
2005 return modified;
2006 }
2007
2008 static int fix_ea_ibody_entries(ext2_extent imap,
2009 struct ext2_inode_large *inode, int inode_size,
2010 ext2_ino_t last_ino)
2011 {
2012 struct ext2_ext_attr_entry *start, *end;
2013 __u32 *ea_magic;
2014
2015 if (inode->i_extra_isize == 0)
2016 return 0;
2017
2018 ea_magic = (__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
2019 inode->i_extra_isize);
2020 if (*ea_magic != EXT2_EXT_ATTR_MAGIC)
2021 return 0;
2022
2023 start = (struct ext2_ext_attr_entry *)(ea_magic + 1);
2024 end = (struct ext2_ext_attr_entry *)((char *)inode + inode_size);
2025
2026 return fix_ea_entries(imap, start, end, last_ino);
2027 }
2028
2029 static int fix_ea_block_entries(ext2_extent imap, char *block_buf,
2030 unsigned int blocksize, ext2_ino_t last_ino)
2031 {
2032 struct ext2_ext_attr_header *header;
2033 struct ext2_ext_attr_entry *start, *end;
2034
2035 header = (struct ext2_ext_attr_header *)block_buf;
2036 start = (struct ext2_ext_attr_entry *)(header+1);
2037 end = (struct ext2_ext_attr_entry *)(block_buf + blocksize);
2038
2039 return fix_ea_entries(imap, start, end, last_ino);
2040 }
2041
2042 /* A simple LRU cache to check recently processed blocks. */
2043 struct blk_cache {
2044 int cursor;
2045 blk64_t blks[4];
2046 };
2047
2048 #define BLK_IN_CACHE(b,c) ((b) == (c).blks[0] || (b) == (c).blks[1] || \
2049 (b) == (c).blks[2] || (b) == (c).blks[3])
2050 #define BLK_ADD_CACHE(b,c) { \
2051 (c).blks[(c).cursor] = (b); \
2052 (c).cursor = ((c).cursor + 1) % 4; \
2053 }
2054
2055 static errcode_t fix_ea_inode_refs(ext2_resize_t rfs, struct ext2_inode *inode,
2056 char *block_buf, ext2_ino_t last_ino)
2057 {
2058 ext2_filsys fs = rfs->new_fs;
2059 ext2_inode_scan scan = NULL;
2060 ext2_ino_t ino;
2061 int inode_size = EXT2_INODE_SIZE(fs->super);
2062 blk64_t blk;
2063 int modified;
2064 struct blk_cache blk_cache;
2065 struct ext2_ext_attr_header *header;
2066 errcode_t retval;
2067
2068 memset(&blk_cache, 0, sizeof(blk_cache));
2069
2070 header = (struct ext2_ext_attr_header *)block_buf;
2071
2072 retval = ext2fs_open_inode_scan(fs, 0, &scan);
2073 if (retval)
2074 goto out;
2075
2076 while (1) {
2077 retval = ext2fs_get_next_inode_full(scan, &ino, inode,
2078 inode_size);
2079 if (retval)
2080 goto out;
2081 if (!ino)
2082 break;
2083
2084 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2085 continue; /* inode not in use */
2086
2087 if (inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
2088 modified = fix_ea_ibody_entries(rfs->imap,
2089 (struct ext2_inode_large *)inode,
2090 inode_size, last_ino);
2091 if (modified) {
2092 retval = ext2fs_write_inode_full(fs, ino, inode,
2093 inode_size);
2094 if (retval)
2095 goto out;
2096 }
2097 }
2098
2099 blk = ext2fs_file_acl_block(fs, inode);
2100 if (blk && !BLK_IN_CACHE(blk, blk_cache)) {
2101 retval = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
2102 if (retval)
2103 goto out;
2104
2105 modified = fix_ea_block_entries(rfs->imap, block_buf,
2106 fs->blocksize,
2107 last_ino);
2108 if (modified) {
2109 retval = ext2fs_write_ext_attr3(fs, blk,
2110 block_buf, ino);
2111 if (retval)
2112 goto out;
2113 /*
2114 * If refcount is greater than 1, we might see
2115 * the same block referenced by other inodes
2116 * later.
2117 */
2118 if (header->h_refcount > 1)
2119 BLK_ADD_CACHE(blk, blk_cache);
2120 }
2121 }
2122 }
2123 retval = 0;
2124 out:
2125 if (scan)
2126 ext2fs_close_inode_scan(scan);
2127 return retval;
2128
2129 }
2130 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
2131 {
2132 struct process_block_struct pb;
2133 ext2_ino_t ino, new_inode;
2134 struct ext2_inode *inode = NULL;
2135 ext2_inode_scan scan = NULL;
2136 errcode_t retval;
2137 char *block_buf = 0;
2138 ext2_ino_t start_to_move;
2139 int inode_size;
2140 int update_ea_inode_refs = 0;
2141
2142 if ((rfs->old_fs->group_desc_count <=
2143 rfs->new_fs->group_desc_count) &&
2144 !rfs->bmap)
2145 return 0;
2146
2147 set_com_err_hook(quiet_com_err_proc);
2148
2149 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
2150 if (retval) goto errout;
2151
2152 retval = ext2fs_init_dblist(rfs->old_fs, 0);
2153 if (retval) goto errout;
2154 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
2155 if (retval) goto errout;
2156
2157 start_to_move = (rfs->new_fs->group_desc_count *
2158 rfs->new_fs->super->s_inodes_per_group);
2159
2160 if (rfs->progress) {
2161 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
2162 0, rfs->old_fs->group_desc_count);
2163 if (retval)
2164 goto errout;
2165 }
2166 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
2167 pb.rfs = rfs;
2168 pb.inode = inode;
2169 pb.error = 0;
2170 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
2171 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
2172 inode = malloc(inode_size);
2173 if (!inode) {
2174 retval = ENOMEM;
2175 goto errout;
2176 }
2177 /*
2178 * First, copy all of the inodes that need to be moved
2179 * elsewhere in the inode table
2180 */
2181 while (1) {
2182 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
2183 if (retval) goto errout;
2184 if (!ino)
2185 break;
2186
2187 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
2188 continue; /* inode not in use */
2189
2190 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
2191 pb.changed = 0;
2192
2193 /* Remap EA block */
2194 retval = migrate_ea_block(rfs, ino, inode, &pb.changed);
2195 if (retval)
2196 goto errout;
2197
2198 new_inode = ino;
2199 if (ino <= start_to_move)
2200 goto remap_blocks; /* Don't need to move inode. */
2201
2202 /*
2203 * Find a new inode. Now that extents and directory blocks
2204 * are tied to the inode number through the checksum, we must
2205 * set up the new inode before we start rewriting blocks.
2206 */
2207 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
2208 if (retval)
2209 goto errout;
2210
2211 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
2212 pb.is_dir);
2213 /*
2214 * i_ctime field in xattr inodes contain a portion of the ref
2215 * count, do not overwrite.
2216 */
2217 if (inode->i_flags & EXT4_EA_INODE_FL)
2218 update_ea_inode_refs = 1;
2219 else
2220 inode->i_ctime = time(0);
2221
2222 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
2223 inode, inode_size);
2224 if (retval)
2225 goto errout;
2226 pb.changed = 0;
2227
2228 #ifdef RESIZE2FS_DEBUG
2229 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
2230 printf("Inode moved %u->%u\n", ino, new_inode);
2231 #endif
2232 if (!rfs->imap) {
2233 retval = ext2fs_create_extent_table(&rfs->imap, 0);
2234 if (retval)
2235 goto errout;
2236 }
2237 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
2238
2239 remap_blocks:
2240 if (pb.changed)
2241 retval = ext2fs_write_inode_full(rfs->old_fs,
2242 new_inode,
2243 inode, inode_size);
2244 if (retval)
2245 goto errout;
2246
2247 /*
2248 * Update inodes to point to new blocks; schedule directory
2249 * blocks for inode remapping. Need to write out dir blocks
2250 * with new inode numbers if we have metadata_csum enabled.
2251 */
2252 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2253 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
2254 (rfs->bmap || pb.is_dir)) {
2255 pb.ino = new_inode;
2256 pb.old_ino = ino;
2257 pb.has_extents = inode->i_flags & EXT4_EXTENTS_FL;
2258 retval = ext2fs_block_iterate3(rfs->old_fs,
2259 new_inode, 0, block_buf,
2260 process_block, &pb);
2261 if (retval)
2262 goto errout;
2263 if (pb.error) {
2264 retval = pb.error;
2265 goto errout;
2266 }
2267 } else if ((inode->i_flags & EXT4_INLINE_DATA_FL) &&
2268 (rfs->bmap || pb.is_dir)) {
2269 /* inline data dir; update it too */
2270 retval = ext2fs_add_dir_block2(rfs->old_fs->dblist,
2271 new_inode, 0, 0);
2272 if (retval)
2273 goto errout;
2274 }
2275
2276 /* Fix up extent block checksums with the new inode number */
2277 if (ext2fs_has_feature_metadata_csum(rfs->old_fs->super) &&
2278 (inode->i_flags & EXT4_EXTENTS_FL)) {
2279 retval = rewrite_extents(rfs->old_fs, new_inode);
2280 if (retval)
2281 goto errout;
2282 }
2283 }
2284
2285 if (update_ea_inode_refs &&
2286 ext2fs_has_feature_ea_inode(rfs->new_fs->super)) {
2287 retval = fix_ea_inode_refs(rfs, inode, block_buf,
2288 start_to_move);
2289 if (retval)
2290 goto errout;
2291 }
2292 io_channel_flush(rfs->old_fs->io);
2293
2294 errout:
2295 reset_com_err_hook();
2296 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2297 if (rfs->bmap) {
2298 ext2fs_free_extent_table(rfs->bmap);
2299 rfs->bmap = 0;
2300 }
2301 if (scan)
2302 ext2fs_close_inode_scan(scan);
2303 if (block_buf)
2304 ext2fs_free_mem(&block_buf);
2305 free(inode);
2306 return retval;
2307 }
2308
2309 /* --------------------------------------------------------------------
2310 *
2311 * Resize processing, phase 4.
2312 *
2313 * --------------------------------------------------------------------
2314 */
2315
2316 struct istruct {
2317 ext2_resize_t rfs;
2318 errcode_t err;
2319 unsigned int max_dirs;
2320 unsigned int num;
2321 };
2322
2323 static int check_and_change_inodes(ext2_ino_t dir,
2324 int entry EXT2FS_ATTR((unused)),
2325 struct ext2_dir_entry *dirent, int offset,
2326 int blocksize EXT2FS_ATTR((unused)),
2327 char *buf EXT2FS_ATTR((unused)),
2328 void *priv_data)
2329 {
2330 struct istruct *is = (struct istruct *) priv_data;
2331 struct ext2_inode inode;
2332 ext2_ino_t new_inode;
2333 errcode_t retval;
2334 int ret = 0;
2335
2336 if (is->rfs->progress && offset == 0) {
2337 io_channel_flush(is->rfs->old_fs->io);
2338 is->err = (is->rfs->progress)(is->rfs,
2339 E2_RSZ_INODE_REF_UPD_PASS,
2340 ++is->num, is->max_dirs);
2341 if (is->err)
2342 return DIRENT_ABORT;
2343 }
2344
2345 /*
2346 * If we have checksums enabled and the inode wasn't present in the
2347 * old fs, then we must rewrite all dir blocks with new checksums.
2348 */
2349 if (ext2fs_has_feature_metadata_csum(is->rfs->old_fs->super) &&
2350 !ext2fs_test_inode_bitmap2(is->rfs->old_fs->inode_map, dir))
2351 ret |= DIRENT_CHANGED;
2352
2353 if (!dirent->inode)
2354 return ret;
2355
2356 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
2357
2358 if (!new_inode)
2359 return ret;
2360 #ifdef RESIZE2FS_DEBUG
2361 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
2362 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
2363 dir, ext2fs_dirent_name_len(dirent), dirent->name,
2364 dirent->inode, new_inode);
2365 #endif
2366
2367 dirent->inode = new_inode;
2368
2369 /* Update the directory mtime and ctime */
2370 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
2371 if (retval == 0) {
2372 inode.i_mtime = inode.i_ctime = time(0);
2373 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
2374 if (is->err)
2375 return ret | DIRENT_ABORT;
2376 }
2377
2378 return ret | DIRENT_CHANGED;
2379 }
2380
2381 static errcode_t inode_ref_fix(ext2_resize_t rfs)
2382 {
2383 errcode_t retval;
2384 struct istruct is;
2385
2386 if (!rfs->imap)
2387 return 0;
2388
2389 /*
2390 * Now, we iterate over all of the directories to update the
2391 * inode references
2392 */
2393 is.num = 0;
2394 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
2395 is.rfs = rfs;
2396 is.err = 0;
2397
2398 if (rfs->progress) {
2399 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2400 0, is.max_dirs);
2401 if (retval)
2402 goto errout;
2403 }
2404
2405 rfs->old_fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
2406 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
2407 DIRENT_FLAG_INCLUDE_EMPTY, 0,
2408 check_and_change_inodes, &is);
2409 rfs->old_fs->flags &= ~EXT2_FLAG_IGNORE_CSUM_ERRORS;
2410 if (retval)
2411 goto errout;
2412 if (is.err) {
2413 retval = is.err;
2414 goto errout;
2415 }
2416
2417 if (rfs->progress && (is.num < is.max_dirs))
2418 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
2419 is.max_dirs, is.max_dirs);
2420
2421 errout:
2422 ext2fs_free_extent_table(rfs->imap);
2423 rfs->imap = 0;
2424 return retval;
2425 }
2426
2427
2428 /* --------------------------------------------------------------------
2429 *
2430 * Resize processing, phase 5.
2431 *
2432 * In this phase we actually move the inode table around, and then
2433 * update the summary statistics. This is scary, since aborting here
2434 * will potentially scramble the filesystem. (We are moving the
2435 * inode tables around in place, and so the potential for lost data,
2436 * or at the very least scrambling the mapping between filenames and
2437 * inode numbers is very high in case of a power failure here.)
2438 * --------------------------------------------------------------------
2439 */
2440
2441
2442 /*
2443 * A very scary routine --- this one moves the inode table around!!!
2444 *
2445 * After this you have to use the rfs->new_fs file handle to read and
2446 * write inodes.
2447 */
2448 static errcode_t move_itables(ext2_resize_t rfs)
2449 {
2450 int n, num, size;
2451 long long diff;
2452 dgrp_t i, max_groups;
2453 ext2_filsys fs = rfs->new_fs;
2454 char *cp;
2455 blk64_t old_blk, new_blk, blk, cluster_freed;
2456 errcode_t retval;
2457 int to_move, moved;
2458 unsigned int j;
2459 ext2fs_block_bitmap new_bmap = NULL;
2460
2461 max_groups = fs->group_desc_count;
2462 if (max_groups > rfs->old_fs->group_desc_count)
2463 max_groups = rfs->old_fs->group_desc_count;
2464
2465 size = fs->blocksize * fs->inode_blocks_per_group;
2466 if (!rfs->itable_buf) {
2467 retval = ext2fs_get_mem(size, &rfs->itable_buf);
2468 if (retval)
2469 return retval;
2470 }
2471
2472 if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
2473 retval = ext2fs_allocate_block_bitmap(fs, _("new meta blocks"),
2474 &new_bmap);
2475 if (retval)
2476 return retval;
2477
2478 retval = mark_table_blocks(fs, new_bmap);
2479 if (retval)
2480 goto errout;
2481 }
2482
2483 /*
2484 * Figure out how many inode tables we need to move
2485 */
2486 to_move = moved = 0;
2487 for (i=0; i < max_groups; i++)
2488 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
2489 ext2fs_inode_table_loc(fs, i))
2490 to_move++;
2491
2492 if (to_move == 0) {
2493 retval = 0;
2494 goto errout;
2495 }
2496
2497 if (rfs->progress) {
2498 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2499 0, to_move);
2500 if (retval)
2501 goto errout;
2502 }
2503
2504 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
2505
2506 for (i=0; i < max_groups; i++) {
2507 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
2508 new_blk = ext2fs_inode_table_loc(fs, i);
2509 diff = new_blk - old_blk;
2510
2511 #ifdef RESIZE2FS_DEBUG
2512 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2513 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
2514 i, old_blk, new_blk, diff);
2515 #endif
2516
2517 if (!diff)
2518 continue;
2519 if (diff < 0)
2520 diff = 0;
2521
2522 retval = io_channel_read_blk64(fs->io, old_blk,
2523 fs->inode_blocks_per_group,
2524 rfs->itable_buf);
2525 if (retval)
2526 goto errout;
2527 /*
2528 * The end of the inode table segment often contains
2529 * all zeros, and we're often only moving the inode
2530 * table down a block or two. If so, we can optimize
2531 * things by not rewriting blocks that we know to be zero
2532 * already.
2533 */
2534 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
2535 if (*cp)
2536 break;
2537 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
2538 #ifdef RESIZE2FS_DEBUG
2539 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2540 printf("%d blocks of zeros...\n", n);
2541 #endif
2542 num = fs->inode_blocks_per_group;
2543 if (n > diff)
2544 num -= n;
2545
2546 retval = io_channel_write_blk64(fs->io, new_blk,
2547 num, rfs->itable_buf);
2548 if (retval) {
2549 io_channel_write_blk64(fs->io, old_blk,
2550 num, rfs->itable_buf);
2551 goto errout;
2552 }
2553 if (n > diff) {
2554 retval = io_channel_write_blk64(fs->io,
2555 old_blk + fs->inode_blocks_per_group,
2556 diff, (rfs->itable_buf +
2557 (fs->inode_blocks_per_group - diff) *
2558 fs->blocksize));
2559 if (retval)
2560 goto errout;
2561 }
2562
2563 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
2564 j < fs->inode_blocks_per_group;) {
2565 if (new_bmap == NULL ||
2566 !ext2fs_test_block_bitmap2(new_bmap, blk)) {
2567 ext2fs_block_alloc_stats2(fs, blk, -1);
2568 cluster_freed = EXT2FS_CLUSTER_RATIO(fs) -
2569 (blk & EXT2FS_CLUSTER_MASK(fs));
2570 blk += cluster_freed;
2571 j += cluster_freed;
2572 continue;
2573 }
2574 blk++;
2575 j++;
2576 }
2577
2578 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
2579 ext2fs_group_desc_csum_set(rfs->old_fs, i);
2580 ext2fs_mark_super_dirty(rfs->old_fs);
2581 ext2fs_flush(rfs->old_fs);
2582
2583 if (rfs->progress) {
2584 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
2585 ++moved, to_move);
2586 if (retval)
2587 goto errout;
2588 }
2589 }
2590 mark_table_blocks(fs, fs->block_map);
2591 ext2fs_flush(fs);
2592 #ifdef RESIZE2FS_DEBUG
2593 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
2594 printf("Inode table move finished.\n");
2595 #endif
2596 retval = 0;
2597
2598 errout:
2599 if (new_bmap)
2600 ext2fs_free_block_bitmap(new_bmap);
2601 return retval;
2602 }
2603
2604 /*
2605 * This function is used when expanding a file system. It frees the
2606 * superblock and block group descriptor blocks from the block group
2607 * which is no longer the last block group.
2608 */
2609 static errcode_t clear_sparse_super2_last_group(ext2_resize_t rfs)
2610 {
2611 ext2_filsys fs = rfs->new_fs;
2612 ext2_filsys old_fs = rfs->old_fs;
2613 errcode_t retval;
2614 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2615 dgrp_t last_bg = fs->group_desc_count - 1;
2616 blk64_t sb, old_desc;
2617 blk_t num;
2618
2619 if (!ext2fs_has_feature_sparse_super2(fs->super))
2620 return 0;
2621
2622 if (last_bg <= old_last_bg)
2623 return 0;
2624
2625 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2626 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2627 return 0;
2628
2629 if (old_fs->super->s_backup_bgs[0] != old_last_bg &&
2630 old_fs->super->s_backup_bgs[1] != old_last_bg)
2631 return 0;
2632
2633 if (fs->super->s_backup_bgs[0] == old_last_bg ||
2634 fs->super->s_backup_bgs[1] == old_last_bg)
2635 return 0;
2636
2637 if (old_last_bg == 0)
2638 return 0;
2639
2640 retval = ext2fs_super_and_bgd_loc2(rfs->old_fs, old_last_bg,
2641 &sb, &old_desc, NULL, &num);
2642 if (retval)
2643 return retval;
2644
2645 if (sb)
2646 ext2fs_unmark_block_bitmap2(fs->block_map, sb);
2647 if (old_desc)
2648 ext2fs_unmark_block_bitmap_range2(fs->block_map, old_desc, num);
2649 return 0;
2650 }
2651
2652 /*
2653 * This function is used when shrinking a file system. We need to
2654 * utilize blocks from what will be the new last block group for the
2655 * backup superblock and block group descriptor blocks.
2656 * Unfortunately, those blocks may be used by other files or fs
2657 * metadata blocks. We need to mark them as being in use.
2658 */
2659 static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
2660 ext2fs_block_bitmap meta_bmap)
2661 {
2662 ext2_filsys fs = rfs->new_fs;
2663 ext2_filsys old_fs = rfs->old_fs;
2664 errcode_t retval;
2665 dgrp_t old_last_bg = rfs->old_fs->group_desc_count - 1;
2666 dgrp_t last_bg = fs->group_desc_count - 1;
2667 dgrp_t g;
2668 blk64_t blk, sb, old_desc;
2669 blk_t i, num;
2670 int realloc = 0;
2671
2672 if (!ext2fs_has_feature_sparse_super2(fs->super))
2673 return 0;
2674
2675 if (last_bg >= old_last_bg)
2676 return 0;
2677
2678 if (fs->super->s_backup_bgs[0] == old_fs->super->s_backup_bgs[0] &&
2679 fs->super->s_backup_bgs[1] == old_fs->super->s_backup_bgs[1])
2680 return 0;
2681
2682 if (fs->super->s_backup_bgs[0] != last_bg &&
2683 fs->super->s_backup_bgs[1] != last_bg)
2684 return 0;
2685
2686 if (old_fs->super->s_backup_bgs[0] == last_bg ||
2687 old_fs->super->s_backup_bgs[1] == last_bg)
2688 return 0;
2689
2690 retval = ext2fs_super_and_bgd_loc2(rfs->new_fs, last_bg,
2691 &sb, &old_desc, NULL, &num);
2692 if (retval)
2693 return retval;
2694
2695 if (last_bg && !sb) {
2696 fputs(_("Should never happen! No sb in last super_sparse bg?\n"),
2697 stderr);
2698 exit(1);
2699 }
2700 if (old_desc && old_desc != sb+1) {
2701 fputs(_("Should never happen! Unexpected old_desc in "
2702 "super_sparse bg?\n"),
2703 stderr);
2704 exit(1);
2705 }
2706 num = (old_desc) ? num : 1;
2707
2708 /* Reserve the backup blocks */
2709 ext2fs_mark_block_bitmap_range2(fs->block_map, sb, num);
2710
2711 for (g = 0; g < fs->group_desc_count; g++) {
2712 blk64_t mb;
2713
2714 mb = ext2fs_block_bitmap_loc(fs, g);
2715 if ((mb >= sb) && (mb < sb + num)) {
2716 ext2fs_block_bitmap_loc_set(fs, g, 0);
2717 realloc = 1;
2718 }
2719 mb = ext2fs_inode_bitmap_loc(fs, g);
2720 if ((mb >= sb) && (mb < sb + num)) {
2721 ext2fs_inode_bitmap_loc_set(fs, g, 0);
2722 realloc = 1;
2723 }
2724 mb = ext2fs_inode_table_loc(fs, g);
2725 if ((mb < sb + num) &&
2726 (sb < mb + fs->inode_blocks_per_group)) {
2727 ext2fs_inode_table_loc_set(fs, g, 0);
2728 realloc = 1;
2729 }
2730 if (realloc) {
2731 retval = ext2fs_allocate_group_table(fs, g, 0);
2732 if (retval)
2733 return retval;
2734 }
2735 }
2736
2737 for (blk = sb, i = 0; i < num; blk++, i++) {
2738 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
2739 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
2740 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
2741 rfs->needed_blocks++;
2742 }
2743 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
2744 }
2745 return 0;
2746 }
2747
2748 /*
2749 * Fix the resize inode
2750 */
2751 static errcode_t fix_resize_inode(ext2_filsys fs)
2752 {
2753 struct ext2_inode inode;
2754 errcode_t retval;
2755
2756 if (!ext2fs_has_feature_resize_inode(fs->super))
2757 return 0;
2758
2759 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
2760 if (retval) goto errout;
2761
2762 ext2fs_iblk_set(fs, &inode, 1);
2763
2764 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
2765 if (retval) goto errout;
2766
2767 if (!inode.i_block[EXT2_DIND_BLOCK]) {
2768 /*
2769 * Avoid zeroing out block #0; that's rude. This
2770 * should never happen anyway since the filesystem
2771 * should be fsck'ed and we assume it is consistent.
2772 */
2773 fprintf(stderr, "%s",
2774 _("Should never happen: resize inode corrupt!\n"));
2775 exit(1);
2776 }
2777
2778 retval = ext2fs_zero_blocks2(fs, inode.i_block[EXT2_DIND_BLOCK], 1,
2779 NULL, NULL);
2780 if (retval)
2781 goto errout;
2782
2783 retval = ext2fs_create_resize_inode(fs);
2784 if (retval)
2785 goto errout;
2786
2787 errout:
2788 return retval;
2789 }
2790
2791 /*
2792 * Finally, recalculate the summary information
2793 */
2794 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
2795 {
2796 blk64_t blk;
2797 ext2_ino_t ino;
2798 unsigned int group = 0;
2799 unsigned int count = 0;
2800 blk64_t total_blocks_free = 0;
2801 int total_inodes_free = 0;
2802 int group_free = 0;
2803 int uninit = 0;
2804 blk64_t super_blk, old_desc_blk, new_desc_blk;
2805 int old_desc_blocks;
2806
2807 /*
2808 * First calculate the block statistics
2809 */
2810 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2811 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
2812 &new_desc_blk, 0);
2813 if (ext2fs_has_feature_meta_bg(fs->super))
2814 old_desc_blocks = fs->super->s_first_meta_bg;
2815 else
2816 old_desc_blocks = fs->desc_blocks +
2817 fs->super->s_reserved_gdt_blocks;
2818 for (blk = B2C(fs->super->s_first_data_block);
2819 blk < ext2fs_blocks_count(fs->super);
2820 blk += EXT2FS_CLUSTER_RATIO(fs)) {
2821 if ((uninit &&
2822 !(EQ_CLSTR(blk, super_blk) ||
2823 ((old_desc_blk && old_desc_blocks &&
2824 GE_CLSTR(blk, old_desc_blk) &&
2825 LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
2826 ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
2827 EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
2828 EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
2829 ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
2830 LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
2831 + fs->inode_blocks_per_group))))) ||
2832 (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
2833 group_free++;
2834 total_blocks_free++;
2835 }
2836 count++;
2837 if ((count == fs->super->s_clusters_per_group) ||
2838 EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
2839 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
2840 ext2fs_group_desc_csum_set(fs, group);
2841 group++;
2842 if (group >= fs->group_desc_count)
2843 break;
2844 count = 0;
2845 group_free = 0;
2846 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
2847 ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
2848 &old_desc_blk,
2849 &new_desc_blk, 0);
2850 if (ext2fs_has_feature_meta_bg(fs->super))
2851 old_desc_blocks = fs->super->s_first_meta_bg;
2852 else
2853 old_desc_blocks = fs->desc_blocks +
2854 fs->super->s_reserved_gdt_blocks;
2855 }
2856 }
2857 total_blocks_free = C2B(total_blocks_free);
2858 ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
2859
2860 /*
2861 * Next, calculate the inode statistics
2862 */
2863 group_free = 0;
2864 count = 0;
2865 group = 0;
2866
2867 /* Protect loop from wrap-around if s_inodes_count maxed */
2868 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2869 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
2870 if (uninit ||
2871 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
2872 group_free++;
2873 total_inodes_free++;
2874 }
2875 count++;
2876 if ((count == fs->super->s_inodes_per_group) ||
2877 (ino == fs->super->s_inodes_count)) {
2878 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
2879 ext2fs_group_desc_csum_set(fs, group);
2880 group++;
2881 if (group >= fs->group_desc_count)
2882 break;
2883 count = 0;
2884 group_free = 0;
2885 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
2886 }
2887 }
2888 fs->super->s_free_inodes_count = total_inodes_free;
2889 ext2fs_mark_super_dirty(fs);
2890 return 0;
2891 }
2892
2893 /*
2894 * Journal may have been relocated; update the backup journal blocks
2895 * in the superblock.
2896 */
2897 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
2898 {
2899 errcode_t retval;
2900 struct ext2_inode inode;
2901
2902 if (!ext2fs_has_feature_journal(fs->super))
2903 return 0;
2904
2905 /* External journal? Nothing to do. */
2906 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2907 return 0;
2908
2909 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2910 if (retval)
2911 return retval;
2912 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2913 fs->super->s_jnl_blocks[15] = inode.i_size_high;
2914 fs->super->s_jnl_blocks[16] = inode.i_size;
2915 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2916 ext2fs_mark_super_dirty(fs);
2917 return 0;
2918 }
2919
2920 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2921 int old_desc_blocks)
2922 {
2923 blk64_t super_blk, old_desc_blk, new_desc_blk;
2924 int overhead;
2925
2926 /* inode table blocks plus allocation bitmaps */
2927 overhead = fs->inode_blocks_per_group + 2;
2928
2929 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2930 &old_desc_blk, &new_desc_blk, 0);
2931 if ((grp == 0) || super_blk)
2932 overhead++;
2933 if (old_desc_blk)
2934 overhead += old_desc_blocks;
2935 else if (new_desc_blk)
2936 overhead++;
2937 return overhead;
2938 }
2939
2940
2941 /*
2942 * calculate the minimum number of blocks the given fs can be resized to
2943 */
2944 blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
2945 {
2946 ext2_ino_t inode_count;
2947 dgrp_t groups, flex_groups;
2948 blk64_t blks_needed, data_blocks;
2949 blk64_t grp, data_needed, last_start;
2950 blk64_t overhead = 0;
2951 int old_desc_blocks;
2952 int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2953
2954 /*
2955 * first figure out how many group descriptors we need to
2956 * handle the number of inodes we have
2957 */
2958 inode_count = fs->super->s_inodes_count -
2959 fs->super->s_free_inodes_count;
2960 blks_needed = ext2fs_div_ceil(inode_count,
2961 fs->super->s_inodes_per_group) *
2962 (blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super);
2963 groups = ext2fs_div64_ceil(blks_needed,
2964 EXT2_BLOCKS_PER_GROUP(fs->super));
2965 #ifdef RESIZE2FS_DEBUG
2966 if (flags & RESIZE_DEBUG_MIN_CALC)
2967 printf("fs has %d inodes, %d groups required.\n",
2968 inode_count, groups);
2969 #endif
2970
2971 /*
2972 * number of old-style block group descriptor blocks
2973 */
2974 if (ext2fs_has_feature_meta_bg(fs->super))
2975 old_desc_blocks = fs->super->s_first_meta_bg;
2976 else
2977 old_desc_blocks = fs->desc_blocks +
2978 fs->super->s_reserved_gdt_blocks;
2979
2980 /* calculate how many blocks are needed for data */
2981 data_needed = ext2fs_blocks_count(fs->super) -
2982 ext2fs_free_blocks_count(fs->super);
2983
2984 for (grp = 0; grp < fs->group_desc_count; grp++)
2985 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
2986 #ifdef RESIZE2FS_DEBUG
2987 if (flags & RESIZE_DEBUG_MIN_CALC)
2988 printf("fs requires %llu data blocks.\n", data_needed);
2989 #endif
2990
2991 /*
2992 * For ext4 we need to allow for up to a flex_bg worth of
2993 * inode tables of slack space so the resize operation can be
2994 * guaranteed to finish.
2995 */
2996 flex_groups = groups;
2997 if (ext2fs_has_feature_flex_bg(fs->super)) {
2998 dgrp_t remainder = groups & (flexbg_size - 1);
2999
3000 flex_groups += flexbg_size - remainder;
3001 if (flex_groups > fs->group_desc_count)
3002 flex_groups = fs->group_desc_count;
3003 }
3004
3005 /*
3006 * figure out how many data blocks we have given the number of groups
3007 * we need for our inodes
3008 */
3009 data_blocks = EXT2_GROUPS_TO_BLOCKS(fs->super, groups);
3010 last_start = 0;
3011 for (grp = 0; grp < flex_groups; grp++) {
3012 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
3013
3014 /*
3015 * we want to keep track of how much data we can store in
3016 * the groups leading up to the last group so we can determine
3017 * how big the last group needs to be
3018 */
3019 if (grp < (groups - 1))
3020 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
3021 overhead;
3022
3023 if (data_blocks > overhead)
3024 data_blocks -= overhead;
3025 else
3026 data_blocks = 0;
3027 }
3028 #ifdef RESIZE2FS_DEBUG
3029 if (flags & RESIZE_DEBUG_MIN_CALC)
3030 printf("With %d group(s), we have %llu blocks available.\n",
3031 groups, data_blocks);
3032 #endif
3033
3034 /*
3035 * if we need more group descriptors in order to accommodate our data
3036 * then we need to add them here
3037 */
3038 blks_needed = data_needed;
3039 while (blks_needed > data_blocks) {
3040 blk64_t remainder = blks_needed - data_blocks;
3041 dgrp_t extra_grps;
3042
3043 /* figure out how many more groups we need for the data */
3044 extra_grps = ext2fs_div64_ceil(remainder,
3045 EXT2_BLOCKS_PER_GROUP(fs->super));
3046
3047 data_blocks += EXT2_GROUPS_TO_BLOCKS(fs->super, extra_grps);
3048
3049 /* ok we have to account for the last group */
3050 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
3051 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
3052
3053 grp = flex_groups;
3054 groups += extra_grps;
3055 if (!ext2fs_has_feature_flex_bg(fs->super))
3056 flex_groups = groups;
3057 else if (groups > flex_groups) {
3058 dgrp_t r = groups & (flexbg_size - 1);
3059
3060 flex_groups = groups + flexbg_size - r;
3061 if (flex_groups > fs->group_desc_count)
3062 flex_groups = fs->group_desc_count;
3063 }
3064
3065 for (; grp < flex_groups; grp++) {
3066 overhead = calc_group_overhead(fs, grp,
3067 old_desc_blocks);
3068
3069 /*
3070 * again, we need to see how much data we cram into
3071 * all of the groups leading up to the last group
3072 */
3073 if (grp < groups - 1)
3074 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
3075 - overhead;
3076
3077 data_blocks -= overhead;
3078 }
3079
3080 #ifdef RESIZE2FS_DEBUG
3081 if (flags & RESIZE_DEBUG_MIN_CALC)
3082 printf("Added %d extra group(s), "
3083 "blks_needed %llu, data_blocks %llu, "
3084 "last_start %llu\n", extra_grps, blks_needed,
3085 data_blocks, last_start);
3086 #endif
3087 }
3088
3089 /* now for the fun voodoo */
3090 grp = groups - 1;
3091 if (ext2fs_has_feature_flex_bg(fs->super) &&
3092 (grp & ~(flexbg_size - 1)) == 0)
3093 grp = grp & ~(flexbg_size - 1);
3094 overhead = 0;
3095 for (; grp < flex_groups; grp++)
3096 overhead += calc_group_overhead(fs, grp, old_desc_blocks);
3097
3098 #ifdef RESIZE2FS_DEBUG
3099 if (flags & RESIZE_DEBUG_MIN_CALC)
3100 printf("Last group's overhead is %llu\n", overhead);
3101 #endif
3102
3103 /*
3104 * if this is the case then the last group is going to have data in it
3105 * so we need to adjust the size of the last group accordingly
3106 */
3107 if (last_start < blks_needed) {
3108 blk64_t remainder = blks_needed - last_start;
3109
3110 #ifdef RESIZE2FS_DEBUG
3111 if (flags & RESIZE_DEBUG_MIN_CALC)
3112 printf("Need %llu data blocks in last group\n",
3113 remainder);
3114 #endif
3115 /*
3116 * 50 is a magic number that mkfs/resize uses to see if its
3117 * even worth making/resizing the fs. basically you need to
3118 * have at least 50 blocks in addition to the blocks needed
3119 * for the metadata in the last group
3120 */
3121 if (remainder > 50)
3122 overhead += remainder;
3123 else
3124 overhead += 50;
3125 } else
3126 overhead += 50;
3127
3128 overhead += fs->super->s_first_data_block;
3129 #ifdef RESIZE2FS_DEBUG
3130 if (flags & RESIZE_DEBUG_MIN_CALC)
3131 printf("Final size of last group is %lld\n", overhead);
3132 #endif
3133
3134 /* Add extra slack for bigalloc file systems */
3135 if (EXT2FS_CLUSTER_RATIO(fs) > 1)
3136 overhead += EXT2FS_CLUSTER_RATIO(fs) * 2;
3137
3138 /*
3139 * since our last group doesn't have to be BLOCKS_PER_GROUP
3140 * large, we only do groups-1, and then add the number of
3141 * blocks needed to handle the group descriptor metadata+data
3142 * that we need
3143 */
3144 blks_needed = EXT2_GROUPS_TO_BLOCKS(fs->super, groups - 1);
3145 blks_needed += overhead;
3146
3147 /*
3148 * Make sure blks_needed covers the end of the inode table in
3149 * the last block group.
3150 */
3151 overhead = ext2fs_inode_table_loc(fs, groups-1) +
3152 fs->inode_blocks_per_group;
3153 if (blks_needed < overhead)
3154 blks_needed = overhead;
3155
3156 #ifdef RESIZE2FS_DEBUG
3157 if (flags & RESIZE_DEBUG_MIN_CALC)
3158 printf("Estimated blocks needed: %llu\n", blks_needed);
3159 #endif
3160
3161 /*
3162 * If at this point we've already added up more "needed" than
3163 * the current size, just return current size as minimum.
3164 */
3165 if (blks_needed >= ext2fs_blocks_count(fs->super))
3166 return ext2fs_blocks_count(fs->super);
3167 /*
3168 * We need to reserve a few extra blocks if extents are
3169 * enabled, in case we need to grow the extent tree. The more
3170 * we shrink the file system, the more space we need.
3171 *
3172 * The absolute worst case is every single data block is in
3173 * the part of the file system that needs to be evacuated,
3174 * with each data block needs to be in its own extent, and
3175 * with each inode needing at least one extent block.
3176 */
3177 if (ext2fs_has_feature_extents(fs->super)) {
3178 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
3179 blks_needed)/500;
3180 unsigned int exts_per_blk = (fs->blocksize /
3181 sizeof(struct ext3_extent)) - 1;
3182 blk64_t worst_case = ((data_needed + exts_per_blk - 1) /
3183 exts_per_blk);
3184
3185 if (worst_case < inode_count)
3186 worst_case = inode_count;
3187
3188 if (safe_margin > worst_case)
3189 safe_margin = worst_case;
3190
3191 #ifdef RESIZE2FS_DEBUG
3192 if (flags & RESIZE_DEBUG_MIN_CALC)
3193 printf("Extents safety margin: %llu\n", safe_margin);
3194 #endif
3195 blks_needed += safe_margin;
3196 }
3197
3198 return blks_needed;
3199 }
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