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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 Theosore 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
57 /*
58 * Some helper CPP macros
59 */
60 #define IS_BLOCK_BM(fs, i, blk) ((blk) == ext2fs_block_bitmap_loc((fs),(i)))
61 #define IS_INODE_BM(fs, i, blk) ((blk) == ext2fs_inode_bitmap_loc((fs),(i)))
62
63 #define IS_INODE_TB(fs, i, blk) (((blk) >= ext2fs_inode_table_loc((fs), (i))) && \
64 ((blk) < (ext2fs_inode_table_loc((fs), (i)) + \
65 (fs)->inode_blocks_per_group)))
66
67 /* Some bigalloc helper macros which are more succint... */
68 #define B2C(x) EXT2FS_B2C(fs, (x))
69 #define C2B(x) EXT2FS_C2B(fs, (x))
70 #define EQ_CLSTR(x, y) (B2C(x) == B2C(y))
71 #define LE_CLSTR(x, y) (B2C(x) <= B2C(y))
72 #define LT_CLSTR(x, y) (B2C(x) < B2C(y))
73 #define GE_CLSTR(x, y) (B2C(x) >= B2C(y))
74 #define GT_CLSTR(x, y) (B2C(x) > B2C(y))
75
76 int lazy_itable_init;
77
78 /*
79 * This is the top-level routine which does the dirty deed....
80 */
81 errcode_t resize_fs(ext2_filsys fs, blk64_t *new_size, int flags,
82 errcode_t (*progress)(ext2_resize_t rfs, int pass,
83 unsigned long cur,
84 unsigned long max_val))
85 {
86 ext2_resize_t rfs;
87 errcode_t retval;
88 struct resource_track rtrack, overall_track;
89
90 /*
91 * Create the data structure
92 */
93 retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
94 if (retval)
95 return retval;
96
97 memset(rfs, 0, sizeof(struct ext2_resize_struct));
98 fs->priv_data = rfs;
99 rfs->old_fs = fs;
100 rfs->flags = flags;
101 rfs->itable_buf = 0;
102 rfs->progress = progress;
103
104 init_resource_track(&overall_track, "overall resize2fs", fs->io);
105 init_resource_track(&rtrack, "read_bitmaps", fs->io);
106 retval = ext2fs_read_bitmaps(fs);
107 if (retval)
108 goto errout;
109 print_resource_track(rfs, &rtrack, fs->io);
110
111 fs->super->s_state |= EXT2_ERROR_FS;
112 ext2fs_mark_super_dirty(fs);
113 ext2fs_flush(fs);
114
115 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 1", fs->io);
116 fix_uninit_block_bitmaps(fs);
117 print_resource_track(rfs, &rtrack, fs->io);
118 retval = ext2fs_dup_handle(fs, &rfs->new_fs);
119 if (retval)
120 goto errout;
121
122 init_resource_track(&rtrack, "adjust_superblock", fs->io);
123 retval = adjust_superblock(rfs, *new_size);
124 if (retval)
125 goto errout;
126 print_resource_track(rfs, &rtrack, fs->io);
127
128
129 init_resource_track(&rtrack, "fix_uninit_block_bitmaps 2", fs->io);
130 fix_uninit_block_bitmaps(rfs->new_fs);
131 print_resource_track(rfs, &rtrack, fs->io);
132 /* Clear the block bitmap uninit flag for the last block group */
133 ext2fs_bg_flags_clear(rfs->new_fs, rfs->new_fs->group_desc_count - 1,
134 EXT2_BG_BLOCK_UNINIT);
135
136 *new_size = ext2fs_blocks_count(rfs->new_fs->super);
137
138 init_resource_track(&rtrack, "blocks_to_move", fs->io);
139 retval = blocks_to_move(rfs);
140 if (retval)
141 goto errout;
142 print_resource_track(rfs, &rtrack, fs->io);
143
144 #ifdef RESIZE2FS_DEBUG
145 if (rfs->flags & RESIZE_DEBUG_BMOVE)
146 printf("Number of free blocks: %llu/%llu, Needed: %llu\n",
147 ext2fs_free_blocks_count(rfs->old_fs->super),
148 ext2fs_free_blocks_count(rfs->new_fs->super),
149 rfs->needed_blocks);
150 #endif
151
152 init_resource_track(&rtrack, "block_mover", fs->io);
153 retval = block_mover(rfs);
154 if (retval)
155 goto errout;
156 print_resource_track(rfs, &rtrack, fs->io);
157
158 init_resource_track(&rtrack, "inode_scan_and_fix", fs->io);
159 retval = inode_scan_and_fix(rfs);
160 if (retval)
161 goto errout;
162 print_resource_track(rfs, &rtrack, fs->io);
163
164 init_resource_track(&rtrack, "inode_ref_fix", fs->io);
165 retval = inode_ref_fix(rfs);
166 if (retval)
167 goto errout;
168 print_resource_track(rfs, &rtrack, fs->io);
169
170 init_resource_track(&rtrack, "move_itables", fs->io);
171 retval = move_itables(rfs);
172 if (retval)
173 goto errout;
174 print_resource_track(rfs, &rtrack, fs->io);
175
176 init_resource_track(&rtrack, "calculate_summary_stats", fs->io);
177 retval = ext2fs_calculate_summary_stats(rfs->new_fs);
178 if (retval)
179 goto errout;
180 print_resource_track(rfs, &rtrack, fs->io);
181
182 init_resource_track(&rtrack, "fix_resize_inode", fs->io);
183 retval = fix_resize_inode(rfs->new_fs);
184 if (retval)
185 goto errout;
186 print_resource_track(rfs, &rtrack, fs->io);
187
188 init_resource_track(&rtrack, "fix_sb_journal_backup", fs->io);
189 retval = fix_sb_journal_backup(rfs->new_fs);
190 if (retval)
191 goto errout;
192 print_resource_track(rfs, &rtrack, fs->io);
193
194 rfs->new_fs->super->s_state &= ~EXT2_ERROR_FS;
195 rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
196
197 print_resource_track(rfs, &overall_track, fs->io);
198 retval = ext2fs_close(rfs->new_fs);
199 if (retval)
200 goto errout;
201
202 rfs->flags = flags;
203
204 ext2fs_free(rfs->old_fs);
205 if (rfs->itable_buf)
206 ext2fs_free_mem(&rfs->itable_buf);
207 if (rfs->reserve_blocks)
208 ext2fs_free_block_bitmap(rfs->reserve_blocks);
209 if (rfs->move_blocks)
210 ext2fs_free_block_bitmap(rfs->move_blocks);
211 ext2fs_free_mem(&rfs);
212
213 return 0;
214
215 errout:
216 if (rfs->new_fs)
217 ext2fs_free(rfs->new_fs);
218 if (rfs->itable_buf)
219 ext2fs_free_mem(&rfs->itable_buf);
220 ext2fs_free_mem(&rfs);
221 return retval;
222 }
223
224 /*
225 * Clean up the bitmaps for unitialized bitmaps
226 */
227 static void fix_uninit_block_bitmaps(ext2_filsys fs)
228 {
229 blk64_t blk, lblk;
230 dgrp_t g;
231 int i;
232
233 if (!ext2fs_has_group_desc_csum(fs))
234 return;
235
236 for (g=0; g < fs->group_desc_count; g++) {
237 if (!(ext2fs_bg_flags_test(fs, g, EXT2_BG_BLOCK_UNINIT)))
238 continue;
239
240 blk = ext2fs_group_first_block2(fs, g);
241 lblk = ext2fs_group_last_block2(fs, g);
242 ext2fs_unmark_block_bitmap_range2(fs->block_map, blk,
243 lblk - blk + 1);
244
245 ext2fs_reserve_super_and_bgd(fs, g, fs->block_map);
246 ext2fs_mark_block_bitmap2(fs->block_map,
247 ext2fs_block_bitmap_loc(fs, g));
248 ext2fs_mark_block_bitmap2(fs->block_map,
249 ext2fs_inode_bitmap_loc(fs, g));
250 for (i = 0, blk = ext2fs_inode_table_loc(fs, g);
251 i < (unsigned int) fs->inode_blocks_per_group;
252 i++, blk++)
253 ext2fs_mark_block_bitmap2(fs->block_map, blk);
254 }
255 }
256
257 /* --------------------------------------------------------------------
258 *
259 * Resize processing, phase 1.
260 *
261 * In this phase we adjust the in-memory superblock information, and
262 * initialize any new parts of the inode table. The new parts of the
263 * inode table are created in virgin disk space, so we can abort here
264 * without any side effects.
265 * --------------------------------------------------------------------
266 */
267
268 /*
269 * If the group descriptor's bitmap and inode table blocks are valid,
270 * release them in the new filesystem data structure, and mark them as
271 * reserved so the old inode table blocks don't get overwritten.
272 */
273 static void free_gdp_blocks(ext2_filsys fs,
274 ext2fs_block_bitmap reserve_blocks,
275 ext2_filsys old_fs,
276 dgrp_t group)
277 {
278 blk64_t blk;
279 int j;
280
281 blk = ext2fs_block_bitmap_loc(old_fs, group);
282 if (blk &&
283 (blk < ext2fs_blocks_count(fs->super))) {
284 ext2fs_block_alloc_stats2(fs, blk, -1);
285 ext2fs_mark_block_bitmap2(reserve_blocks, blk);
286 }
287
288 blk = ext2fs_inode_bitmap_loc(old_fs, group);
289 if (blk &&
290 (blk < ext2fs_blocks_count(fs->super))) {
291 ext2fs_block_alloc_stats2(fs, blk, -1);
292 ext2fs_mark_block_bitmap2(reserve_blocks, blk);
293 }
294
295 blk = ext2fs_inode_table_loc(old_fs, group);
296 if (blk == 0 ||
297 (blk >= ext2fs_blocks_count(fs->super)))
298 return;
299
300 for (j = 0;
301 j < fs->inode_blocks_per_group; j++, blk++) {
302 if (blk >= ext2fs_blocks_count(fs->super))
303 break;
304 ext2fs_block_alloc_stats2(fs, blk, -1);
305 ext2fs_mark_block_bitmap2(reserve_blocks, blk);
306 }
307 }
308
309 /*
310 * This routine is shared by the online and offline resize routines.
311 * All of the information which is adjusted in memory is done here.
312 */
313 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs,
314 ext2fs_block_bitmap reserve_blocks, blk64_t new_size)
315 {
316 errcode_t retval;
317 blk64_t overhead = 0;
318 blk64_t rem;
319 blk64_t blk, group_block;
320 blk64_t real_end;
321 blk64_t old_numblocks, numblocks, adjblocks;
322 unsigned long i, j, old_desc_blocks;
323 unsigned int meta_bg, meta_bg_size;
324 int has_super, csum_flag;
325 unsigned long long new_inodes; /* u64 to check for overflow */
326 double percent;
327
328 ext2fs_blocks_count_set(fs->super, new_size);
329
330 retry:
331 fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) -
332 fs->super->s_first_data_block,
333 EXT2_BLOCKS_PER_GROUP(fs->super));
334 if (fs->group_desc_count == 0)
335 return EXT2_ET_TOOSMALL;
336 fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
337 EXT2_DESC_PER_BLOCK(fs->super));
338
339 /*
340 * Overhead is the number of bookkeeping blocks per group. It
341 * includes the superblock backup, the group descriptor
342 * backups, the inode bitmap, the block bitmap, and the inode
343 * table.
344 */
345 overhead = (int) (2 + fs->inode_blocks_per_group);
346
347 if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
348 overhead += 1 + fs->desc_blocks +
349 fs->super->s_reserved_gdt_blocks;
350
351 /*
352 * See if the last group is big enough to support the
353 * necessary data structures. If not, we need to get rid of
354 * it.
355 */
356 rem = (ext2fs_blocks_count(fs->super) - fs->super->s_first_data_block) %
357 fs->super->s_blocks_per_group;
358 if ((fs->group_desc_count == 1) && rem && (rem < overhead))
359 return EXT2_ET_TOOSMALL;
360 if ((fs->group_desc_count > 1) && rem && (rem < overhead+50)) {
361 ext2fs_blocks_count_set(fs->super,
362 ext2fs_blocks_count(fs->super) - rem);
363 goto retry;
364 }
365 /*
366 * Adjust the number of inodes
367 */
368 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
369 if (new_inodes > ~0U) {
370 fprintf(stderr, _("inodes (%llu) must be less than %u"),
371 new_inodes, ~0U);
372 return EXT2_ET_TOO_MANY_INODES;
373 }
374 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
375 fs->group_desc_count;
376
377 /*
378 * Adjust the number of free blocks
379 */
380 blk = ext2fs_blocks_count(old_fs->super);
381 if (blk > ext2fs_blocks_count(fs->super))
382 ext2fs_free_blocks_count_set(fs->super,
383 ext2fs_free_blocks_count(fs->super) -
384 (blk - ext2fs_blocks_count(fs->super)));
385 else
386 ext2fs_free_blocks_count_set(fs->super,
387 ext2fs_free_blocks_count(fs->super) +
388 (ext2fs_blocks_count(fs->super) - blk));
389
390 /*
391 * Adjust the number of reserved blocks
392 */
393 percent = (ext2fs_r_blocks_count(old_fs->super) * 100.0) /
394 ext2fs_blocks_count(old_fs->super);
395 ext2fs_r_blocks_count_set(fs->super,
396 (percent * ext2fs_blocks_count(fs->super) /
397 100.0));
398
399 /*
400 * Adjust the bitmaps for size
401 */
402 retval = ext2fs_resize_inode_bitmap2(fs->super->s_inodes_count,
403 fs->super->s_inodes_count,
404 fs->inode_map);
405 if (retval) goto errout;
406
407 real_end = (((blk64_t) EXT2_BLOCKS_PER_GROUP(fs->super) *
408 fs->group_desc_count)) - 1 +
409 fs->super->s_first_data_block;
410 retval = ext2fs_resize_block_bitmap2(new_size - 1,
411 real_end, fs->block_map);
412 if (retval) goto errout;
413
414 /*
415 * If we are growing the file system, also grow the size of
416 * the reserve_blocks bitmap
417 */
418 if (reserve_blocks && new_size > ext2fs_blocks_count(old_fs->super)) {
419 retval = ext2fs_resize_block_bitmap2(new_size - 1,
420 real_end, reserve_blocks);
421 if (retval) goto errout;
422 }
423
424 /*
425 * Reallocate the group descriptors as necessary.
426 */
427 if (old_fs->desc_blocks != fs->desc_blocks) {
428 retval = ext2fs_resize_mem(old_fs->desc_blocks *
429 fs->blocksize,
430 fs->desc_blocks * fs->blocksize,
431 &fs->group_desc);
432 if (retval)
433 goto errout;
434 if (fs->desc_blocks > old_fs->desc_blocks)
435 memset((char *) fs->group_desc +
436 (old_fs->desc_blocks * fs->blocksize), 0,
437 (fs->desc_blocks - old_fs->desc_blocks) *
438 fs->blocksize);
439 }
440
441 /*
442 * If the resize_inode feature is set, and we are changing the
443 * number of descriptor blocks, then adjust
444 * s_reserved_gdt_blocks if possible to avoid needing to move
445 * the inode table either now or in the future.
446 */
447 if ((fs->super->s_feature_compat &
448 EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
449 (old_fs->desc_blocks != fs->desc_blocks)) {
450 int new;
451
452 new = ((int) fs->super->s_reserved_gdt_blocks) +
453 (old_fs->desc_blocks - fs->desc_blocks);
454 if (new < 0)
455 new = 0;
456 if (new > (int) fs->blocksize/4)
457 new = fs->blocksize/4;
458 fs->super->s_reserved_gdt_blocks = new;
459 }
460
461 /*
462 * If we are shrinking the number of block groups, we're done
463 * and can exit now.
464 */
465 if (old_fs->group_desc_count > fs->group_desc_count) {
466 /*
467 * Check the block groups that we are chopping off
468 * and free any blocks associated with their metadata
469 */
470 for (i = fs->group_desc_count;
471 i < old_fs->group_desc_count; i++)
472 free_gdp_blocks(fs, reserve_blocks, old_fs, i);
473 retval = 0;
474 goto errout;
475 }
476
477 /*
478 * Fix the count of the last (old) block group
479 */
480 old_numblocks = (ext2fs_blocks_count(old_fs->super) -
481 old_fs->super->s_first_data_block) %
482 old_fs->super->s_blocks_per_group;
483 if (!old_numblocks)
484 old_numblocks = old_fs->super->s_blocks_per_group;
485 if (old_fs->group_desc_count == fs->group_desc_count) {
486 numblocks = (ext2fs_blocks_count(fs->super) -
487 fs->super->s_first_data_block) %
488 fs->super->s_blocks_per_group;
489 if (!numblocks)
490 numblocks = fs->super->s_blocks_per_group;
491 } else
492 numblocks = fs->super->s_blocks_per_group;
493 i = old_fs->group_desc_count - 1;
494 ext2fs_bg_free_blocks_count_set(fs, i, ext2fs_bg_free_blocks_count(fs, i) + (numblocks - old_numblocks));
495 ext2fs_group_desc_csum_set(fs, i);
496
497 /*
498 * If the number of block groups is staying the same, we're
499 * done and can exit now. (If the number block groups is
500 * shrinking, we had exited earlier.)
501 */
502 if (old_fs->group_desc_count >= fs->group_desc_count) {
503 retval = 0;
504 goto errout;
505 }
506
507 /*
508 * Initialize the new block group descriptors
509 */
510 group_block = ext2fs_group_first_block2(fs,
511 old_fs->group_desc_count);
512 csum_flag = ext2fs_has_group_desc_csum(fs);
513 if (access("/sys/fs/ext4/features/lazy_itable_init", F_OK) == 0)
514 lazy_itable_init = 1;
515 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
516 old_desc_blocks = fs->super->s_first_meta_bg;
517 else
518 old_desc_blocks = fs->desc_blocks +
519 fs->super->s_reserved_gdt_blocks;
520
521 /*
522 * If we changed the number of block_group descriptor blocks,
523 * we need to make sure they are all marked as reserved in the
524 * file systems's block allocation map.
525 */
526 for (i = 0; i < old_fs->group_desc_count; i++)
527 ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
528
529 for (i = old_fs->group_desc_count;
530 i < fs->group_desc_count; i++) {
531 memset(ext2fs_group_desc(fs, fs->group_desc, i), 0,
532 sizeof(struct ext2_group_desc));
533 adjblocks = 0;
534
535 ext2fs_bg_flags_zap(fs, i);
536 if (csum_flag) {
537 ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
538 if (!lazy_itable_init)
539 ext2fs_bg_flags_set(fs, i,
540 EXT2_BG_INODE_ZEROED);
541 ext2fs_bg_itable_unused_set(fs, i,
542 fs->super->s_inodes_per_group);
543 }
544
545 numblocks = ext2fs_group_blocks_count(fs, i);
546 if ((i < fs->group_desc_count - 1) && csum_flag)
547 ext2fs_bg_flags_set(fs, i, EXT2_BG_BLOCK_UNINIT);
548
549 has_super = ext2fs_bg_has_super(fs, i);
550 if (has_super) {
551 ext2fs_block_alloc_stats2(fs, group_block, +1);
552 adjblocks++;
553 }
554 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
555 meta_bg = i / meta_bg_size;
556 if (!(fs->super->s_feature_incompat &
557 EXT2_FEATURE_INCOMPAT_META_BG) ||
558 (meta_bg < fs->super->s_first_meta_bg)) {
559 if (has_super) {
560 for (j=0; j < old_desc_blocks; j++)
561 ext2fs_block_alloc_stats2(fs,
562 group_block + 1 + j, +1);
563 adjblocks += old_desc_blocks;
564 }
565 } else {
566 if (has_super)
567 has_super = 1;
568 if (((i % meta_bg_size) == 0) ||
569 ((i % meta_bg_size) == 1) ||
570 ((i % meta_bg_size) == (meta_bg_size-1)))
571 ext2fs_block_alloc_stats2(fs,
572 group_block + has_super, +1);
573 }
574
575 adjblocks += 2 + fs->inode_blocks_per_group;
576
577 numblocks -= adjblocks;
578 ext2fs_free_blocks_count_set(fs->super,
579 ext2fs_free_blocks_count(fs->super) - adjblocks);
580 fs->super->s_free_inodes_count +=
581 fs->super->s_inodes_per_group;
582 ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
583 ext2fs_bg_free_inodes_count_set(fs, i,
584 fs->super->s_inodes_per_group);
585 ext2fs_bg_used_dirs_count_set(fs, i, 0);
586 ext2fs_group_desc_csum_set(fs, i);
587
588 retval = ext2fs_allocate_group_table(fs, i, 0);
589 if (retval) goto errout;
590
591 group_block += fs->super->s_blocks_per_group;
592 }
593 retval = 0;
594
595 /*
596 * Mark all of the metadata blocks as reserved so they won't
597 * get allocated by the call to ext2fs_allocate_group_table()
598 * in blocks_to_move(), where we allocate new blocks to
599 * replace those allocation bitmap and inode table blocks
600 * which have to get relocated to make space for an increased
601 * number of the block group descriptors.
602 */
603 if (reserve_blocks)
604 mark_table_blocks(fs, reserve_blocks);
605
606 errout:
607 return (retval);
608 }
609
610 /*
611 * This routine adjusts the superblock and other data structures, both
612 * in disk as well as in memory...
613 */
614 static errcode_t adjust_superblock(ext2_resize_t rfs, blk64_t new_size)
615 {
616 ext2_filsys fs;
617 int adj = 0;
618 errcode_t retval;
619 blk64_t group_block;
620 unsigned long i;
621 unsigned long max_group;
622
623 fs = rfs->new_fs;
624 ext2fs_mark_super_dirty(fs);
625 ext2fs_mark_bb_dirty(fs);
626 ext2fs_mark_ib_dirty(fs);
627
628 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
629 &rfs->reserve_blocks);
630 if (retval)
631 return retval;
632
633 retval = adjust_fs_info(fs, rfs->old_fs, rfs->reserve_blocks, new_size);
634 if (retval)
635 goto errout;
636
637 /*
638 * Check to make sure there are enough inodes
639 */
640 if ((rfs->old_fs->super->s_inodes_count -
641 rfs->old_fs->super->s_free_inodes_count) >
642 rfs->new_fs->super->s_inodes_count) {
643 retval = ENOSPC;
644 goto errout;
645 }
646
647 /*
648 * If we are shrinking the number block groups, we're done and
649 * can exit now.
650 */
651 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
652 retval = 0;
653 goto errout;
654 }
655
656 /*
657 * If the number of block groups is staying the same, we're
658 * done and can exit now. (If the number block groups is
659 * shrinking, we had exited earlier.)
660 */
661 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
662 retval = 0;
663 goto errout;
664 }
665
666 /*
667 * If we are using uninit_bg (aka GDT_CSUM) and the kernel
668 * supports lazy inode initialization, we can skip
669 * initializing the inode table.
670 */
671 if (lazy_itable_init &&
672 EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
673 EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
674 retval = 0;
675 goto errout;
676 }
677
678 /*
679 * Initialize the inode table
680 */
681 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
682 &rfs->itable_buf);
683 if (retval)
684 goto errout;
685
686 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
687 group_block = ext2fs_group_first_block2(fs,
688 rfs->old_fs->group_desc_count);
689 adj = rfs->old_fs->group_desc_count;
690 max_group = fs->group_desc_count - adj;
691 if (rfs->progress) {
692 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
693 0, max_group);
694 if (retval)
695 goto errout;
696 }
697 for (i = rfs->old_fs->group_desc_count;
698 i < fs->group_desc_count; i++) {
699 /*
700 * Write out the new inode table
701 */
702 retval = io_channel_write_blk64(fs->io,
703 ext2fs_inode_table_loc(fs, i),
704 fs->inode_blocks_per_group,
705 rfs->itable_buf);
706 if (retval) goto errout;
707
708 io_channel_flush(fs->io);
709 if (rfs->progress) {
710 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
711 i - adj + 1, max_group);
712 if (retval)
713 goto errout;
714 }
715 group_block += fs->super->s_blocks_per_group;
716 }
717 io_channel_flush(fs->io);
718 retval = 0;
719
720 errout:
721 return retval;
722 }
723
724 /* --------------------------------------------------------------------
725 *
726 * Resize processing, phase 2.
727 *
728 * In this phase we adjust determine which blocks need to be moved, in
729 * blocks_to_move(). We then copy the blocks to their ultimate new
730 * destinations using block_mover(). Since we are copying blocks to
731 * their new locations, again during this pass we can abort without
732 * any problems.
733 * --------------------------------------------------------------------
734 */
735
736 /*
737 * This helper function creates a block bitmap with all of the
738 * filesystem meta-data blocks.
739 */
740 static errcode_t mark_table_blocks(ext2_filsys fs,
741 ext2fs_block_bitmap bmap)
742 {
743 dgrp_t i;
744 blk64_t blk;
745
746 for (i = 0; i < fs->group_desc_count; i++) {
747 ext2fs_reserve_super_and_bgd(fs, i, bmap);
748
749 /*
750 * Mark the blocks used for the inode table
751 */
752 blk = ext2fs_inode_table_loc(fs, i);
753 if (blk)
754 ext2fs_mark_block_bitmap_range2(bmap, blk,
755 fs->inode_blocks_per_group);
756
757 /*
758 * Mark block used for the block bitmap
759 */
760 blk = ext2fs_block_bitmap_loc(fs, i);
761 if (blk)
762 ext2fs_mark_block_bitmap2(bmap, blk);
763
764 /*
765 * Mark block used for the inode bitmap
766 */
767 blk = ext2fs_inode_bitmap_loc(fs, i);
768 if (blk)
769 ext2fs_mark_block_bitmap2(bmap, blk);
770 }
771 return 0;
772 }
773
774 /*
775 * This function checks to see if a particular block (either a
776 * superblock or a block group descriptor) overlaps with an inode or
777 * block bitmap block, or with the inode table.
778 */
779 static void mark_fs_metablock(ext2_resize_t rfs,
780 ext2fs_block_bitmap meta_bmap,
781 int group, blk64_t blk)
782 {
783 ext2_filsys fs = rfs->new_fs;
784
785 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
786 ext2fs_block_alloc_stats2(fs, blk, +1);
787
788 /*
789 * Check to see if we overlap with the inode or block bitmap,
790 * or the inode tables. If not, and the block is in use, then
791 * mark it as a block to be moved.
792 */
793 if (IS_BLOCK_BM(fs, group, blk)) {
794 ext2fs_block_bitmap_loc_set(fs, group, 0);
795 rfs->needed_blocks++;
796 return;
797 }
798 if (IS_INODE_BM(fs, group, blk)) {
799 ext2fs_inode_bitmap_loc_set(fs, group, 0);
800 rfs->needed_blocks++;
801 return;
802 }
803 if (IS_INODE_TB(fs, group, blk)) {
804 ext2fs_inode_table_loc_set(fs, group, 0);
805 rfs->needed_blocks++;
806 return;
807 }
808 if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
809 dgrp_t i;
810
811 for (i=0; i < rfs->old_fs->group_desc_count; i++) {
812 if (IS_BLOCK_BM(fs, i, blk)) {
813 ext2fs_block_bitmap_loc_set(fs, i, 0);
814 rfs->needed_blocks++;
815 return;
816 }
817 if (IS_INODE_BM(fs, i, blk)) {
818 ext2fs_inode_bitmap_loc_set(fs, i, 0);
819 rfs->needed_blocks++;
820 return;
821 }
822 if (IS_INODE_TB(fs, i, blk)) {
823 ext2fs_inode_table_loc_set(fs, i, 0);
824 rfs->needed_blocks++;
825 return;
826 }
827 }
828 }
829
830 if (ext2fs_has_group_desc_csum(fs) &&
831 (ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT))) {
832 /*
833 * If the block bitmap is uninitialized, which means
834 * nothing other than standard metadata in use.
835 */
836 return;
837 } else if (ext2fs_test_block_bitmap2(rfs->old_fs->block_map, blk) &&
838 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
839 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
840 rfs->needed_blocks++;
841 }
842 }
843
844
845 /*
846 * This routine marks and unmarks reserved blocks in the new block
847 * bitmap. It also determines which blocks need to be moved and
848 * places this information into the move_blocks bitmap.
849 */
850 static errcode_t blocks_to_move(ext2_resize_t rfs)
851 {
852 int j, has_super;
853 dgrp_t i, max_groups, g;
854 blk64_t blk, group_blk;
855 blk64_t old_blocks, new_blocks;
856 blk64_t new_size;
857 unsigned int meta_bg, meta_bg_size;
858 errcode_t retval;
859 ext2_filsys fs, old_fs;
860 ext2fs_block_bitmap meta_bmap;
861 int flex_bg;
862
863 fs = rfs->new_fs;
864 old_fs = rfs->old_fs;
865 if (ext2fs_blocks_count(old_fs->super) > ext2fs_blocks_count(fs->super))
866 fs = rfs->old_fs;
867
868 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
869 &rfs->move_blocks);
870 if (retval)
871 return retval;
872
873 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
874 &meta_bmap);
875 if (retval)
876 return retval;
877
878 retval = mark_table_blocks(old_fs, meta_bmap);
879 if (retval)
880 return retval;
881
882 fs = rfs->new_fs;
883
884 /*
885 * If we're shrinking the filesystem, we need to move any
886 * group's metadata blocks (either allocation bitmaps or the
887 * inode table) which are beyond the end of the new
888 * filesystem.
889 */
890 new_size = ext2fs_blocks_count(fs->super);
891 if (new_size < ext2fs_blocks_count(old_fs->super)) {
892 for (g = 0; g < fs->group_desc_count; g++) {
893 int realloc = 0;
894 /*
895 * ext2fs_allocate_group_table will re-allocate any
896 * metadata blocks whose location is set to zero.
897 */
898 if (ext2fs_block_bitmap_loc(fs, g) >= new_size) {
899 ext2fs_block_bitmap_loc_set(fs, g, 0);
900 realloc = 1;
901 }
902 if (ext2fs_inode_bitmap_loc(fs, g) >= new_size) {
903 ext2fs_inode_bitmap_loc_set(fs, g, 0);
904 realloc = 1;
905 }
906 if ((ext2fs_inode_table_loc(fs, g) +
907 fs->inode_blocks_per_group) > new_size) {
908 ext2fs_inode_table_loc_set(fs, g, 0);
909 realloc = 1;
910 }
911
912 if (realloc) {
913 retval = ext2fs_allocate_group_table(fs, g, 0);
914 if (retval)
915 return retval;
916 }
917 }
918 }
919
920 /*
921 * If we're shrinking the filesystem, we need to move all of
922 * the blocks that don't fit any more
923 */
924 for (blk = ext2fs_blocks_count(fs->super);
925 blk < ext2fs_blocks_count(old_fs->super); blk++) {
926 g = ext2fs_group_of_blk2(fs, blk);
927 if (ext2fs_has_group_desc_csum(fs) &&
928 ext2fs_bg_flags_test(old_fs, g, EXT2_BG_BLOCK_UNINIT)) {
929 /*
930 * The block bitmap is uninitialized, so skip
931 * to the next block group.
932 */
933 blk = ext2fs_group_first_block2(fs, g+1) - 1;
934 continue;
935 }
936 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
937 !ext2fs_test_block_bitmap2(meta_bmap, blk)) {
938 ext2fs_mark_block_bitmap2(rfs->move_blocks, blk);
939 rfs->needed_blocks++;
940 }
941 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
942 }
943
944 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
945 old_blocks = old_fs->super->s_first_meta_bg;
946 new_blocks = fs->super->s_first_meta_bg;
947 } else {
948 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
949 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
950 }
951
952 if (old_blocks == new_blocks) {
953 retval = 0;
954 goto errout;
955 }
956
957 max_groups = fs->group_desc_count;
958 if (max_groups > old_fs->group_desc_count)
959 max_groups = old_fs->group_desc_count;
960 group_blk = old_fs->super->s_first_data_block;
961 /*
962 * If we're reducing the number of descriptor blocks, this
963 * makes life easy. :-) We just have to mark some extra
964 * blocks as free.
965 */
966 if (old_blocks > new_blocks) {
967 for (i = 0; i < max_groups; i++) {
968 if (!ext2fs_bg_has_super(fs, i)) {
969 group_blk += fs->super->s_blocks_per_group;
970 continue;
971 }
972 for (blk = group_blk+1+new_blocks;
973 blk < group_blk+1+old_blocks; blk++) {
974 ext2fs_block_alloc_stats2(fs, blk, -1);
975 rfs->needed_blocks--;
976 }
977 group_blk += fs->super->s_blocks_per_group;
978 }
979 retval = 0;
980 goto errout;
981 }
982 /*
983 * If we're increasing the number of descriptor blocks, life
984 * gets interesting....
985 */
986 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
987 flex_bg = fs->super->s_feature_incompat &
988 EXT4_FEATURE_INCOMPAT_FLEX_BG;
989 /* first reserve all of the existing fs meta blocks */
990 for (i = 0; i < max_groups; i++) {
991 has_super = ext2fs_bg_has_super(fs, i);
992 if (has_super)
993 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
994
995 meta_bg = i / meta_bg_size;
996 if (!(fs->super->s_feature_incompat &
997 EXT2_FEATURE_INCOMPAT_META_BG) ||
998 (meta_bg < fs->super->s_first_meta_bg)) {
999 if (has_super) {
1000 for (blk = group_blk+1;
1001 blk < group_blk + 1 + new_blocks; blk++)
1002 mark_fs_metablock(rfs, meta_bmap,
1003 i, blk);
1004 }
1005 } else {
1006 if (has_super)
1007 has_super = 1;
1008 if (((i % meta_bg_size) == 0) ||
1009 ((i % meta_bg_size) == 1) ||
1010 ((i % meta_bg_size) == (meta_bg_size-1)))
1011 mark_fs_metablock(rfs, meta_bmap, i,
1012 group_blk + has_super);
1013 }
1014
1015 /*
1016 * Reserve the existing meta blocks that we know
1017 * aren't to be moved.
1018 *
1019 * For flex_bg file systems, in order to avoid
1020 * overwriting fs metadata (especially inode table
1021 * blocks) belonging to a different block group when
1022 * we are relocating the inode tables, we need to
1023 * reserve all existing fs metadata blocks.
1024 */
1025 if (ext2fs_block_bitmap_loc(fs, i))
1026 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1027 ext2fs_block_bitmap_loc(fs, i));
1028 else if (flex_bg && i < old_fs->group_desc_count)
1029 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1030 ext2fs_block_bitmap_loc(old_fs, i));
1031
1032 if (ext2fs_inode_bitmap_loc(fs, i))
1033 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1034 ext2fs_inode_bitmap_loc(fs, i));
1035 else if (flex_bg && i < old_fs->group_desc_count)
1036 ext2fs_mark_block_bitmap2(rfs->reserve_blocks,
1037 ext2fs_inode_bitmap_loc(old_fs, i));
1038
1039 if (ext2fs_inode_table_loc(fs, i))
1040 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1041 ext2fs_inode_table_loc(fs, i),
1042 fs->inode_blocks_per_group);
1043 else if (flex_bg && i < old_fs->group_desc_count)
1044 ext2fs_mark_block_bitmap_range2(rfs->reserve_blocks,
1045 ext2fs_inode_table_loc(old_fs, i),
1046 old_fs->inode_blocks_per_group);
1047
1048 group_blk += rfs->new_fs->super->s_blocks_per_group;
1049 }
1050
1051 /* Allocate the missing data structures */
1052 for (i = 0; i < max_groups; i++) {
1053 if (ext2fs_inode_table_loc(fs, i) &&
1054 ext2fs_inode_bitmap_loc(fs, i) &&
1055 ext2fs_block_bitmap_loc(fs, i))
1056 continue;
1057
1058 retval = ext2fs_allocate_group_table(fs, i,
1059 rfs->reserve_blocks);
1060 if (retval)
1061 goto errout;
1062
1063 /*
1064 * For those structures that have changed, we need to
1065 * do bookkeepping.
1066 */
1067 if (ext2fs_block_bitmap_loc(old_fs, i) !=
1068 (blk = ext2fs_block_bitmap_loc(fs, i))) {
1069 ext2fs_block_alloc_stats2(fs, blk, +1);
1070 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1071 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1072 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1073 blk);
1074 }
1075 if (ext2fs_inode_bitmap_loc(old_fs, i) !=
1076 (blk = ext2fs_inode_bitmap_loc(fs, i))) {
1077 ext2fs_block_alloc_stats2(fs, blk, +1);
1078 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1079 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1080 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1081 blk);
1082 }
1083
1084 /*
1085 * The inode table, if we need to relocate it, is
1086 * handled specially. We have to reserve the blocks
1087 * for both the old and the new inode table, since we
1088 * can't have the inode table be destroyed during the
1089 * block relocation phase.
1090 */
1091 if (ext2fs_inode_table_loc(fs, i) == ext2fs_inode_table_loc(old_fs, i))
1092 continue; /* inode table not moved */
1093
1094 rfs->needed_blocks += fs->inode_blocks_per_group;
1095
1096 /*
1097 * Mark the new inode table as in use in the new block
1098 * allocation bitmap, and move any blocks that might
1099 * be necessary.
1100 */
1101 for (blk = ext2fs_inode_table_loc(fs, i), j=0;
1102 j < fs->inode_blocks_per_group ; j++, blk++) {
1103 ext2fs_block_alloc_stats2(fs, blk, +1);
1104 if (ext2fs_test_block_bitmap2(old_fs->block_map, blk) &&
1105 !ext2fs_test_block_bitmap2(meta_bmap, blk))
1106 ext2fs_mark_block_bitmap2(rfs->move_blocks,
1107 blk);
1108 }
1109
1110 /*
1111 * Make sure the old inode table is reserved in the
1112 * block reservation bitmap.
1113 */
1114 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1115 j < fs->inode_blocks_per_group ; j++, blk++)
1116 ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
1117 }
1118 retval = 0;
1119
1120 errout:
1121 if (meta_bmap)
1122 ext2fs_free_block_bitmap(meta_bmap);
1123
1124 return retval;
1125 }
1126
1127 /*
1128 * This helper function tries to allocate a new block. We try to
1129 * avoid hitting the original group descriptor blocks at least at
1130 * first, since we want to make it possible to recover from a badly
1131 * aborted resize operation as much as possible.
1132 *
1133 * In the future, I may further modify this routine to balance out
1134 * where we get the new blocks across the various block groups.
1135 * Ideally we would allocate blocks that corresponded with the block
1136 * group of the containing inode, and keep contiguous blocks
1137 * together. However, this very difficult to do efficiently, since we
1138 * don't have the necessary information up front.
1139 */
1140
1141 #define AVOID_OLD 1
1142 #define DESPERATION 2
1143
1144 static void init_block_alloc(ext2_resize_t rfs)
1145 {
1146 rfs->alloc_state = AVOID_OLD;
1147 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
1148 #if 0
1149 /* HACK for testing */
1150 if (ext2fs_blocks_count(rfs->new_fs->super) >
1151 ext2fs_blocks_count(rfs->old_fs->super))
1152 rfs->new_blk = ext2fs_blocks_count(rfs->old_fs->super);
1153 #endif
1154 }
1155
1156 static blk64_t get_new_block(ext2_resize_t rfs)
1157 {
1158 ext2_filsys fs = rfs->new_fs;
1159
1160 while (1) {
1161 if (rfs->new_blk >= ext2fs_blocks_count(fs->super)) {
1162 if (rfs->alloc_state == DESPERATION)
1163 return 0;
1164
1165 #ifdef RESIZE2FS_DEBUG
1166 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1167 printf("Going into desperation mode "
1168 "for block allocations\n");
1169 #endif
1170 rfs->alloc_state = DESPERATION;
1171 rfs->new_blk = fs->super->s_first_data_block;
1172 continue;
1173 }
1174 if (ext2fs_test_block_bitmap2(fs->block_map, rfs->new_blk) ||
1175 ext2fs_test_block_bitmap2(rfs->reserve_blocks,
1176 rfs->new_blk) ||
1177 ((rfs->alloc_state == AVOID_OLD) &&
1178 (rfs->new_blk < ext2fs_blocks_count(rfs->old_fs->super)) &&
1179 ext2fs_test_block_bitmap2(rfs->old_fs->block_map,
1180 rfs->new_blk))) {
1181 rfs->new_blk++;
1182 continue;
1183 }
1184 return rfs->new_blk;
1185 }
1186 }
1187
1188 static errcode_t resize2fs_get_alloc_block(ext2_filsys fs, blk64_t goal,
1189 blk64_t *ret)
1190 {
1191 ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
1192 blk64_t blk;
1193
1194 blk = get_new_block(rfs);
1195 if (!blk)
1196 return ENOSPC;
1197
1198 #ifdef RESIZE2FS_DEBUG
1199 if (rfs->flags & 0xF)
1200 printf("get_alloc_block allocating %llu\n", blk);
1201 #endif
1202
1203 ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
1204 ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
1205 *ret = (blk64_t) blk;
1206 return 0;
1207 }
1208
1209 static errcode_t block_mover(ext2_resize_t rfs)
1210 {
1211 blk64_t blk, old_blk, new_blk;
1212 ext2_filsys fs = rfs->new_fs;
1213 ext2_filsys old_fs = rfs->old_fs;
1214 errcode_t retval;
1215 __u64 size;
1216 int c;
1217 int to_move, moved;
1218 ext2_badblocks_list badblock_list = 0;
1219 int bb_modified = 0;
1220
1221 fs->get_alloc_block = resize2fs_get_alloc_block;
1222 old_fs->get_alloc_block = resize2fs_get_alloc_block;
1223
1224 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
1225 if (retval)
1226 return retval;
1227
1228 new_blk = fs->super->s_first_data_block;
1229 if (!rfs->itable_buf) {
1230 retval = ext2fs_get_array(fs->blocksize,
1231 fs->inode_blocks_per_group,
1232 &rfs->itable_buf);
1233 if (retval)
1234 return retval;
1235 }
1236 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
1237 if (retval)
1238 return retval;
1239
1240 /*
1241 * The first step is to figure out where all of the blocks
1242 * will go.
1243 */
1244 to_move = moved = 0;
1245 init_block_alloc(rfs);
1246 for (blk = B2C(old_fs->super->s_first_data_block);
1247 blk < ext2fs_blocks_count(old_fs->super);
1248 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1249 if (!ext2fs_test_block_bitmap2(old_fs->block_map, blk))
1250 continue;
1251 if (!ext2fs_test_block_bitmap2(rfs->move_blocks, blk))
1252 continue;
1253 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
1254 ext2fs_badblocks_list_del(badblock_list, blk);
1255 bb_modified++;
1256 continue;
1257 }
1258
1259 new_blk = get_new_block(rfs);
1260 if (!new_blk) {
1261 retval = ENOSPC;
1262 goto errout;
1263 }
1264 ext2fs_block_alloc_stats2(fs, new_blk, +1);
1265 ext2fs_add_extent_entry(rfs->bmap, B2C(blk), B2C(new_blk));
1266 to_move++;
1267 }
1268
1269 if (to_move == 0) {
1270 if (rfs->bmap) {
1271 ext2fs_free_extent_table(rfs->bmap);
1272 rfs->bmap = 0;
1273 }
1274 retval = 0;
1275 goto errout;
1276 }
1277
1278 /*
1279 * Step two is to actually move the blocks
1280 */
1281 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
1282 if (retval) goto errout;
1283
1284 if (rfs->progress) {
1285 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
1286 0, to_move);
1287 if (retval)
1288 goto errout;
1289 }
1290 while (1) {
1291 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
1292 if (retval) goto errout;
1293 if (!size)
1294 break;
1295 old_blk = C2B(old_blk);
1296 new_blk = C2B(new_blk);
1297 size = C2B(size);
1298 #ifdef RESIZE2FS_DEBUG
1299 if (rfs->flags & RESIZE_DEBUG_BMOVE)
1300 printf("Moving %llu blocks %llu->%llu\n",
1301 size, old_blk, new_blk);
1302 #endif
1303 do {
1304 c = size;
1305 if (c > fs->inode_blocks_per_group)
1306 c = fs->inode_blocks_per_group;
1307 retval = io_channel_read_blk64(fs->io, old_blk, c,
1308 rfs->itable_buf);
1309 if (retval) goto errout;
1310 retval = io_channel_write_blk64(fs->io, new_blk, c,
1311 rfs->itable_buf);
1312 if (retval) goto errout;
1313 size -= c;
1314 new_blk += c;
1315 old_blk += c;
1316 moved += c;
1317 if (rfs->progress) {
1318 io_channel_flush(fs->io);
1319 retval = (rfs->progress)(rfs,
1320 E2_RSZ_BLOCK_RELOC_PASS,
1321 moved, to_move);
1322 if (retval)
1323 goto errout;
1324 }
1325 } while (size > 0);
1326 io_channel_flush(fs->io);
1327 }
1328
1329 errout:
1330 if (badblock_list) {
1331 if (!retval && bb_modified)
1332 retval = ext2fs_update_bb_inode(old_fs,
1333 badblock_list);
1334 ext2fs_badblocks_list_free(badblock_list);
1335 }
1336 return retval;
1337 }
1338
1339
1340 /* --------------------------------------------------------------------
1341 *
1342 * Resize processing, phase 3
1343 *
1344 * --------------------------------------------------------------------
1345 */
1346
1347
1348 /*
1349 * The extent translation table is stored in clusters so we need to
1350 * take special care when mapping a source block number to its
1351 * destination block number.
1352 */
1353 __u64 extent_translate(ext2_filsys fs, ext2_extent extent, __u64 old_loc)
1354 {
1355 __u64 new_block = C2B(ext2fs_extent_translate(extent, B2C(old_loc)));
1356
1357 if (new_block != 0)
1358 new_block += old_loc & (EXT2FS_CLUSTER_RATIO(fs) - 1);
1359 return new_block;
1360 }
1361
1362 struct process_block_struct {
1363 ext2_resize_t rfs;
1364 ext2_ino_t ino;
1365 struct ext2_inode * inode;
1366 errcode_t error;
1367 int is_dir;
1368 int changed;
1369 };
1370
1371 static int process_block(ext2_filsys fs, blk64_t *block_nr,
1372 e2_blkcnt_t blockcnt,
1373 blk64_t ref_block EXT2FS_ATTR((unused)),
1374 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1375 {
1376 struct process_block_struct *pb;
1377 errcode_t retval;
1378 blk64_t block, new_block;
1379 int ret = 0;
1380
1381 pb = (struct process_block_struct *) priv_data;
1382 block = *block_nr;
1383 if (pb->rfs->bmap) {
1384 new_block = extent_translate(fs, pb->rfs->bmap, block);
1385 if (new_block) {
1386 *block_nr = new_block;
1387 ret |= BLOCK_CHANGED;
1388 pb->changed = 1;
1389 #ifdef RESIZE2FS_DEBUG
1390 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1391 printf("ino=%u, blockcnt=%lld, %llu->%llu\n",
1392 pb->ino, blockcnt, block, new_block);
1393 #endif
1394 block = new_block;
1395 }
1396 }
1397 if (pb->is_dir) {
1398 retval = ext2fs_add_dir_block2(fs->dblist, pb->ino,
1399 block, (int) blockcnt);
1400 if (retval) {
1401 pb->error = retval;
1402 ret |= BLOCK_ABORT;
1403 }
1404 }
1405 return ret;
1406 }
1407
1408 /*
1409 * Progress callback
1410 */
1411 static errcode_t progress_callback(ext2_filsys fs,
1412 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1413 dgrp_t group, void * priv_data)
1414 {
1415 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1416 errcode_t retval;
1417
1418 /*
1419 * This check is to protect against old ext2 libraries. It
1420 * shouldn't be needed against new libraries.
1421 */
1422 if ((group+1) == 0)
1423 return 0;
1424
1425 if (rfs->progress) {
1426 io_channel_flush(fs->io);
1427 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1428 group+1, fs->group_desc_count);
1429 if (retval)
1430 return retval;
1431 }
1432
1433 return 0;
1434 }
1435
1436 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1437 {
1438 struct process_block_struct pb;
1439 ext2_ino_t ino, new_inode;
1440 struct ext2_inode *inode = NULL;
1441 ext2_inode_scan scan = NULL;
1442 errcode_t retval;
1443 char *block_buf = 0;
1444 ext2_ino_t start_to_move;
1445 blk64_t orig_size;
1446 blk64_t new_block;
1447 int inode_size;
1448
1449 if ((rfs->old_fs->group_desc_count <=
1450 rfs->new_fs->group_desc_count) &&
1451 !rfs->bmap)
1452 return 0;
1453
1454 /*
1455 * Save the original size of the old filesystem, and
1456 * temporarily set the size to be the new size if the new size
1457 * is larger. We need to do this to avoid catching an error
1458 * by the block iterator routines
1459 */
1460 orig_size = ext2fs_blocks_count(rfs->old_fs->super);
1461 if (orig_size < ext2fs_blocks_count(rfs->new_fs->super))
1462 ext2fs_blocks_count_set(rfs->old_fs->super,
1463 ext2fs_blocks_count(rfs->new_fs->super));
1464
1465 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1466 if (retval) goto errout;
1467
1468 retval = ext2fs_init_dblist(rfs->old_fs, 0);
1469 if (retval) goto errout;
1470 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
1471 if (retval) goto errout;
1472
1473 start_to_move = (rfs->new_fs->group_desc_count *
1474 rfs->new_fs->super->s_inodes_per_group);
1475
1476 if (rfs->progress) {
1477 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1478 0, rfs->old_fs->group_desc_count);
1479 if (retval)
1480 goto errout;
1481 }
1482 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1483 pb.rfs = rfs;
1484 pb.inode = inode;
1485 pb.error = 0;
1486 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1487 inode_size = EXT2_INODE_SIZE(rfs->new_fs->super);
1488 inode = malloc(inode_size);
1489 if (!inode) {
1490 retval = ENOMEM;
1491 goto errout;
1492 }
1493 /*
1494 * First, copy all of the inodes that need to be moved
1495 * elsewhere in the inode table
1496 */
1497 while (1) {
1498 retval = ext2fs_get_next_inode_full(scan, &ino, inode, inode_size);
1499 if (retval) goto errout;
1500 if (!ino)
1501 break;
1502
1503 if (inode->i_links_count == 0 && ino != EXT2_RESIZE_INO)
1504 continue; /* inode not in use */
1505
1506 pb.is_dir = LINUX_S_ISDIR(inode->i_mode);
1507 pb.changed = 0;
1508
1509 if (ext2fs_file_acl_block(rfs->old_fs, inode) && rfs->bmap) {
1510 new_block = extent_translate(rfs->old_fs, rfs->bmap,
1511 ext2fs_file_acl_block(rfs->old_fs, inode));
1512 if (new_block) {
1513 ext2fs_file_acl_block_set(rfs->old_fs, inode,
1514 new_block);
1515 retval = ext2fs_write_inode_full(rfs->old_fs,
1516 ino, inode, inode_size);
1517 if (retval) goto errout;
1518 }
1519 }
1520
1521 if (ext2fs_inode_has_valid_blocks2(rfs->old_fs, inode) &&
1522 (rfs->bmap || pb.is_dir)) {
1523 pb.ino = ino;
1524 retval = ext2fs_block_iterate3(rfs->old_fs,
1525 ino, 0, block_buf,
1526 process_block, &pb);
1527 if (retval)
1528 goto errout;
1529 if (pb.error) {
1530 retval = pb.error;
1531 goto errout;
1532 }
1533 }
1534
1535 if (ino <= start_to_move)
1536 continue; /* Don't need to move it. */
1537
1538 /*
1539 * Find a new inode
1540 */
1541 retval = ext2fs_new_inode(rfs->new_fs, 0, 0, 0, &new_inode);
1542 if (retval)
1543 goto errout;
1544
1545 ext2fs_inode_alloc_stats2(rfs->new_fs, new_inode, +1,
1546 pb.is_dir);
1547 if (pb.changed) {
1548 /* Get the new version of the inode */
1549 retval = ext2fs_read_inode_full(rfs->old_fs, ino,
1550 inode, inode_size);
1551 if (retval) goto errout;
1552 }
1553 inode->i_ctime = time(0);
1554 retval = ext2fs_write_inode_full(rfs->old_fs, new_inode,
1555 inode, inode_size);
1556 if (retval) goto errout;
1557
1558 #ifdef RESIZE2FS_DEBUG
1559 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1560 printf("Inode moved %u->%u\n", ino, new_inode);
1561 #endif
1562 if (!rfs->imap) {
1563 retval = ext2fs_create_extent_table(&rfs->imap, 0);
1564 if (retval)
1565 goto errout;
1566 }
1567 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1568 }
1569 io_channel_flush(rfs->old_fs->io);
1570
1571 errout:
1572 ext2fs_blocks_count_set(rfs->old_fs->super, orig_size);
1573 if (rfs->bmap) {
1574 ext2fs_free_extent_table(rfs->bmap);
1575 rfs->bmap = 0;
1576 }
1577 if (scan)
1578 ext2fs_close_inode_scan(scan);
1579 if (block_buf)
1580 ext2fs_free_mem(&block_buf);
1581 free(inode);
1582 return retval;
1583 }
1584
1585 /* --------------------------------------------------------------------
1586 *
1587 * Resize processing, phase 4.
1588 *
1589 * --------------------------------------------------------------------
1590 */
1591
1592 struct istruct {
1593 ext2_resize_t rfs;
1594 errcode_t err;
1595 unsigned int max_dirs;
1596 unsigned int num;
1597 };
1598
1599 static int check_and_change_inodes(ext2_ino_t dir,
1600 int entry EXT2FS_ATTR((unused)),
1601 struct ext2_dir_entry *dirent, int offset,
1602 int blocksize EXT2FS_ATTR((unused)),
1603 char *buf EXT2FS_ATTR((unused)),
1604 void *priv_data)
1605 {
1606 struct istruct *is = (struct istruct *) priv_data;
1607 struct ext2_inode inode;
1608 ext2_ino_t new_inode;
1609 errcode_t retval;
1610
1611 if (is->rfs->progress && offset == 0) {
1612 io_channel_flush(is->rfs->old_fs->io);
1613 is->err = (is->rfs->progress)(is->rfs,
1614 E2_RSZ_INODE_REF_UPD_PASS,
1615 ++is->num, is->max_dirs);
1616 if (is->err)
1617 return DIRENT_ABORT;
1618 }
1619
1620 if (!dirent->inode)
1621 return 0;
1622
1623 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1624
1625 if (!new_inode)
1626 return 0;
1627 #ifdef RESIZE2FS_DEBUG
1628 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1629 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1630 dir, ext2fs_dirent_name_len(dirent), dirent->name,
1631 dirent->inode, new_inode);
1632 #endif
1633
1634 dirent->inode = new_inode;
1635
1636 /* Update the directory mtime and ctime */
1637 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1638 if (retval == 0) {
1639 inode.i_mtime = inode.i_ctime = time(0);
1640 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1641 if (is->err)
1642 return DIRENT_ABORT;
1643 }
1644
1645 return DIRENT_CHANGED;
1646 }
1647
1648 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1649 {
1650 errcode_t retval;
1651 struct istruct is;
1652
1653 if (!rfs->imap)
1654 return 0;
1655
1656 /*
1657 * Now, we iterate over all of the directories to update the
1658 * inode references
1659 */
1660 is.num = 0;
1661 is.max_dirs = ext2fs_dblist_count2(rfs->old_fs->dblist);
1662 is.rfs = rfs;
1663 is.err = 0;
1664
1665 if (rfs->progress) {
1666 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1667 0, is.max_dirs);
1668 if (retval)
1669 goto errout;
1670 }
1671
1672 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1673 DIRENT_FLAG_INCLUDE_EMPTY, 0,
1674 check_and_change_inodes, &is);
1675 if (retval)
1676 goto errout;
1677 if (is.err) {
1678 retval = is.err;
1679 goto errout;
1680 }
1681
1682 if (rfs->progress && (is.num < is.max_dirs))
1683 (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1684 is.max_dirs, is.max_dirs);
1685
1686 errout:
1687 ext2fs_free_extent_table(rfs->imap);
1688 rfs->imap = 0;
1689 return retval;
1690 }
1691
1692
1693 /* --------------------------------------------------------------------
1694 *
1695 * Resize processing, phase 5.
1696 *
1697 * In this phase we actually move the inode table around, and then
1698 * update the summary statistics. This is scary, since aborting here
1699 * will potentially scramble the filesystem. (We are moving the
1700 * inode tables around in place, and so the potential for lost data,
1701 * or at the very least scrambling the mapping between filenames and
1702 * inode numbers is very high in case of a power failure here.)
1703 * --------------------------------------------------------------------
1704 */
1705
1706
1707 /*
1708 * A very scary routine --- this one moves the inode table around!!!
1709 *
1710 * After this you have to use the rfs->new_fs file handle to read and
1711 * write inodes.
1712 */
1713 static errcode_t move_itables(ext2_resize_t rfs)
1714 {
1715 int n, num, size;
1716 long long diff;
1717 dgrp_t i, max_groups;
1718 ext2_filsys fs = rfs->new_fs;
1719 char *cp;
1720 blk64_t old_blk, new_blk, blk;
1721 errcode_t retval;
1722 int j, to_move, moved;
1723
1724 max_groups = fs->group_desc_count;
1725 if (max_groups > rfs->old_fs->group_desc_count)
1726 max_groups = rfs->old_fs->group_desc_count;
1727
1728 size = fs->blocksize * fs->inode_blocks_per_group;
1729 if (!rfs->itable_buf) {
1730 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1731 if (retval)
1732 return retval;
1733 }
1734
1735 /*
1736 * Figure out how many inode tables we need to move
1737 */
1738 to_move = moved = 0;
1739 for (i=0; i < max_groups; i++)
1740 if (ext2fs_inode_table_loc(rfs->old_fs, i) !=
1741 ext2fs_inode_table_loc(fs, i))
1742 to_move++;
1743
1744 if (to_move == 0)
1745 return 0;
1746
1747 if (rfs->progress) {
1748 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1749 0, to_move);
1750 if (retval)
1751 goto errout;
1752 }
1753
1754 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1755
1756 for (i=0; i < max_groups; i++) {
1757 old_blk = ext2fs_inode_table_loc(rfs->old_fs, i);
1758 new_blk = ext2fs_inode_table_loc(fs, i);
1759 diff = new_blk - old_blk;
1760
1761 #ifdef RESIZE2FS_DEBUG
1762 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1763 printf("Itable move group %d block %llu->%llu (diff %lld)\n",
1764 i, old_blk, new_blk, diff);
1765 #endif
1766
1767 if (!diff)
1768 continue;
1769
1770 retval = io_channel_read_blk64(fs->io, old_blk,
1771 fs->inode_blocks_per_group,
1772 rfs->itable_buf);
1773 if (retval)
1774 goto errout;
1775 /*
1776 * The end of the inode table segment often contains
1777 * all zeros, and we're often only moving the inode
1778 * table down a block or two. If so, we can optimize
1779 * things by not rewriting blocks that we know to be zero
1780 * already.
1781 */
1782 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
1783 if (*cp)
1784 break;
1785 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1786 #ifdef RESIZE2FS_DEBUG
1787 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1788 printf("%d blocks of zeros...\n", n);
1789 #endif
1790 num = fs->inode_blocks_per_group;
1791 if (n > diff)
1792 num -= n;
1793
1794 retval = io_channel_write_blk64(fs->io, new_blk,
1795 num, rfs->itable_buf);
1796 if (retval) {
1797 io_channel_write_blk64(fs->io, old_blk,
1798 num, rfs->itable_buf);
1799 goto errout;
1800 }
1801 if (n > diff) {
1802 retval = io_channel_write_blk64(fs->io,
1803 old_blk + fs->inode_blocks_per_group,
1804 diff, (rfs->itable_buf +
1805 (fs->inode_blocks_per_group - diff) *
1806 fs->blocksize));
1807 if (retval)
1808 goto errout;
1809 }
1810
1811 for (blk = ext2fs_inode_table_loc(rfs->old_fs, i), j=0;
1812 j < fs->inode_blocks_per_group ; j++, blk++)
1813 ext2fs_block_alloc_stats2(fs, blk, -1);
1814
1815 ext2fs_inode_table_loc_set(rfs->old_fs, i, new_blk);
1816 ext2fs_group_desc_csum_set(rfs->old_fs, i);
1817 ext2fs_mark_super_dirty(rfs->old_fs);
1818 ext2fs_flush(rfs->old_fs);
1819
1820 if (rfs->progress) {
1821 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1822 ++moved, to_move);
1823 if (retval)
1824 goto errout;
1825 }
1826 }
1827 mark_table_blocks(fs, fs->block_map);
1828 ext2fs_flush(fs);
1829 #ifdef RESIZE2FS_DEBUG
1830 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1831 printf("Inode table move finished.\n");
1832 #endif
1833 return 0;
1834
1835 errout:
1836 return retval;
1837 }
1838
1839 /*
1840 * Fix the resize inode
1841 */
1842 static errcode_t fix_resize_inode(ext2_filsys fs)
1843 {
1844 struct ext2_inode inode;
1845 errcode_t retval;
1846 char *block_buf = NULL;
1847
1848 if (!(fs->super->s_feature_compat &
1849 EXT2_FEATURE_COMPAT_RESIZE_INODE))
1850 return 0;
1851
1852 retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1853 if (retval) goto errout;
1854
1855 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1856 if (retval) goto errout;
1857
1858 ext2fs_iblk_set(fs, &inode, 1);
1859
1860 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1861 if (retval) goto errout;
1862
1863 if (!inode.i_block[EXT2_DIND_BLOCK]) {
1864 /*
1865 * Avoid zeroing out block #0; that's rude. This
1866 * should never happen anyway since the filesystem
1867 * should be fsck'ed and we assume it is consistent.
1868 */
1869 fprintf(stderr,
1870 _("Should never happen: resize inode corrupt!\n"));
1871 exit(1);
1872 }
1873
1874 memset(block_buf, 0, fs->blocksize);
1875
1876 retval = io_channel_write_blk64(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1877 1, block_buf);
1878 if (retval) goto errout;
1879
1880 retval = ext2fs_create_resize_inode(fs);
1881 if (retval)
1882 goto errout;
1883
1884 errout:
1885 if (block_buf)
1886 ext2fs_free_mem(&block_buf);
1887 return retval;
1888 }
1889
1890 /*
1891 * Finally, recalculate the summary information
1892 */
1893 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1894 {
1895 blk64_t blk;
1896 ext2_ino_t ino;
1897 unsigned int group = 0;
1898 unsigned int count = 0;
1899 blk64_t total_blocks_free = 0;
1900 int total_inodes_free = 0;
1901 int group_free = 0;
1902 int uninit = 0;
1903 blk64_t super_blk, old_desc_blk, new_desc_blk;
1904 int old_desc_blocks;
1905
1906 /*
1907 * First calculate the block statistics
1908 */
1909 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
1910 ext2fs_super_and_bgd_loc2(fs, group, &super_blk, &old_desc_blk,
1911 &new_desc_blk, 0);
1912 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
1913 old_desc_blocks = fs->super->s_first_meta_bg;
1914 else
1915 old_desc_blocks = fs->desc_blocks +
1916 fs->super->s_reserved_gdt_blocks;
1917 for (blk = B2C(fs->super->s_first_data_block);
1918 blk < ext2fs_blocks_count(fs->super);
1919 blk += EXT2FS_CLUSTER_RATIO(fs)) {
1920 if ((uninit &&
1921 !(EQ_CLSTR(blk, super_blk) ||
1922 ((old_desc_blk && old_desc_blocks &&
1923 GE_CLSTR(blk, old_desc_blk) &&
1924 LT_CLSTR(blk, old_desc_blk + old_desc_blocks))) ||
1925 ((new_desc_blk && EQ_CLSTR(blk, new_desc_blk))) ||
1926 EQ_CLSTR(blk, ext2fs_block_bitmap_loc(fs, group)) ||
1927 EQ_CLSTR(blk, ext2fs_inode_bitmap_loc(fs, group)) ||
1928 ((GE_CLSTR(blk, ext2fs_inode_table_loc(fs, group)) &&
1929 LT_CLSTR(blk, ext2fs_inode_table_loc(fs, group)
1930 + fs->inode_blocks_per_group))))) ||
1931 (!ext2fs_fast_test_block_bitmap2(fs->block_map, blk))) {
1932 group_free++;
1933 total_blocks_free++;
1934 }
1935 count++;
1936 if ((count == fs->super->s_clusters_per_group) ||
1937 EQ_CLSTR(blk, ext2fs_blocks_count(fs->super)-1)) {
1938 ext2fs_bg_free_blocks_count_set(fs, group, group_free);
1939 ext2fs_group_desc_csum_set(fs, group);
1940 group++;
1941 if (group >= fs->group_desc_count)
1942 break;
1943 count = 0;
1944 group_free = 0;
1945 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT);
1946 ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
1947 &old_desc_blk,
1948 &new_desc_blk, 0);
1949 if (fs->super->s_feature_incompat &
1950 EXT2_FEATURE_INCOMPAT_META_BG)
1951 old_desc_blocks = fs->super->s_first_meta_bg;
1952 else
1953 old_desc_blocks = fs->desc_blocks +
1954 fs->super->s_reserved_gdt_blocks;
1955 }
1956 }
1957 total_blocks_free = C2B(total_blocks_free);
1958 ext2fs_free_blocks_count_set(fs->super, total_blocks_free);
1959
1960 /*
1961 * Next, calculate the inode statistics
1962 */
1963 group_free = 0;
1964 count = 0;
1965 group = 0;
1966
1967 /* Protect loop from wrap-around if s_inodes_count maxed */
1968 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
1969 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
1970 if (uninit ||
1971 !ext2fs_fast_test_inode_bitmap2(fs->inode_map, ino)) {
1972 group_free++;
1973 total_inodes_free++;
1974 }
1975 count++;
1976 if ((count == fs->super->s_inodes_per_group) ||
1977 (ino == fs->super->s_inodes_count)) {
1978 ext2fs_bg_free_inodes_count_set(fs, group, group_free);
1979 ext2fs_group_desc_csum_set(fs, group);
1980 group++;
1981 if (group >= fs->group_desc_count)
1982 break;
1983 count = 0;
1984 group_free = 0;
1985 uninit = ext2fs_bg_flags_test(fs, group, EXT2_BG_INODE_UNINIT);
1986 }
1987 }
1988 fs->super->s_free_inodes_count = total_inodes_free;
1989 ext2fs_mark_super_dirty(fs);
1990 return 0;
1991 }
1992
1993 /*
1994 * Journal may have been relocated; update the backup journal blocks
1995 * in the superblock.
1996 */
1997 static errcode_t fix_sb_journal_backup(ext2_filsys fs)
1998 {
1999 errcode_t retval;
2000 struct ext2_inode inode;
2001
2002 if (!(fs->super->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
2003 return 0;
2004
2005 /* External journal? Nothing to do. */
2006 if (fs->super->s_journal_dev && !fs->super->s_journal_inum)
2007 return 0;
2008
2009 retval = ext2fs_read_inode(fs, fs->super->s_journal_inum, &inode);
2010 if (retval)
2011 return retval;
2012 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
2013 fs->super->s_jnl_blocks[15] = inode.i_size_high;
2014 fs->super->s_jnl_blocks[16] = inode.i_size;
2015 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
2016 ext2fs_mark_super_dirty(fs);
2017 return 0;
2018 }
2019
2020 static int calc_group_overhead(ext2_filsys fs, blk64_t grp,
2021 int old_desc_blocks)
2022 {
2023 blk64_t super_blk, old_desc_blk, new_desc_blk;
2024 int overhead;
2025
2026 /* inode table blocks plus allocation bitmaps */
2027 overhead = fs->inode_blocks_per_group + 2;
2028
2029 ext2fs_super_and_bgd_loc2(fs, grp, &super_blk,
2030 &old_desc_blk, &new_desc_blk, 0);
2031 if ((grp == 0) || super_blk)
2032 overhead++;
2033 if (old_desc_blk)
2034 overhead += old_desc_blocks;
2035 else if (new_desc_blk)
2036 overhead++;
2037 return overhead;
2038 }
2039
2040
2041 /*
2042 * calcluate the minimum number of blocks the given fs can be resized to
2043 */
2044 blk64_t calculate_minimum_resize_size(ext2_filsys fs, int flags)
2045 {
2046 ext2_ino_t inode_count;
2047 dgrp_t groups;
2048 blk64_t blks_needed, data_blocks;
2049 blk64_t grp, data_needed, last_start;
2050 blk64_t overhead = 0;
2051 int old_desc_blocks;
2052 int extra_groups = 0;
2053 int flexbg_size = 1 << fs->super->s_log_groups_per_flex;
2054
2055 /*
2056 * first figure out how many group descriptors we need to
2057 * handle the number of inodes we have
2058 */
2059 inode_count = fs->super->s_inodes_count -
2060 fs->super->s_free_inodes_count;
2061 blks_needed = ext2fs_div_ceil(inode_count,
2062 fs->super->s_inodes_per_group) *
2063 EXT2_BLOCKS_PER_GROUP(fs->super);
2064 groups = ext2fs_div64_ceil(blks_needed,
2065 EXT2_BLOCKS_PER_GROUP(fs->super));
2066 #ifdef RESIZE2FS_DEBUG
2067 if (flags & RESIZE_DEBUG_MIN_CALC)
2068 printf("fs has %d inodes, %d groups required.\n",
2069 inode_count, groups);
2070 #endif
2071
2072 /*
2073 * number of old-style block group descriptor blocks
2074 */
2075 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
2076 old_desc_blocks = fs->super->s_first_meta_bg;
2077 else
2078 old_desc_blocks = fs->desc_blocks +
2079 fs->super->s_reserved_gdt_blocks;
2080
2081 /* calculate how many blocks are needed for data */
2082 data_needed = ext2fs_blocks_count(fs->super) -
2083 ext2fs_free_blocks_count(fs->super);
2084
2085 for (grp = 0; grp < fs->group_desc_count; grp++)
2086 data_needed -= calc_group_overhead(fs, grp, old_desc_blocks);
2087 #ifdef RESIZE2FS_DEBUG
2088 if (flags & RESIZE_DEBUG_MIN_CALC)
2089 printf("fs requires %llu data blocks.\n", data_needed);
2090 #endif
2091
2092 /*
2093 * For ext4 we need to allow for up to a flex_bg worth of
2094 * inode tables of slack space so the resize operation can be
2095 * guaranteed to finish.
2096 */
2097 if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_FLEX_BG) {
2098 extra_groups = flexbg_size - (groups & (flexbg_size - 1));
2099 data_needed += fs->inode_blocks_per_group * extra_groups;
2100 extra_groups = groups % flexbg_size;
2101 }
2102
2103 /*
2104 * figure out how many data blocks we have given the number of groups
2105 * we need for our inodes
2106 */
2107 data_blocks = groups * EXT2_BLOCKS_PER_GROUP(fs->super);
2108 last_start = 0;
2109 for (grp = 0; grp < groups; grp++) {
2110 overhead = calc_group_overhead(fs, grp, old_desc_blocks);
2111
2112 /*
2113 * we want to keep track of how much data we can store in
2114 * the groups leading up to the last group so we can determine
2115 * how big the last group needs to be
2116 */
2117 if (grp != (groups - 1))
2118 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) -
2119 overhead;
2120
2121 data_blocks -= overhead;
2122 }
2123 #ifdef RESIZE2FS_DEBUG
2124 if (flags & RESIZE_DEBUG_MIN_CALC)
2125 printf("With %d group(s), we have %llu blocks available.\n",
2126 groups, data_blocks);
2127 #endif
2128
2129 /*
2130 * if we need more group descriptors in order to accomodate our data
2131 * then we need to add them here
2132 */
2133 while (data_needed > data_blocks) {
2134 blk64_t remainder = data_needed - data_blocks;
2135 dgrp_t extra_grps;
2136
2137 /* figure out how many more groups we need for the data */
2138 extra_grps = ext2fs_div64_ceil(remainder,
2139 EXT2_BLOCKS_PER_GROUP(fs->super));
2140
2141 data_blocks += extra_grps * EXT2_BLOCKS_PER_GROUP(fs->super);
2142
2143 /* ok we have to account for the last group */
2144 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2145 last_start += EXT2_BLOCKS_PER_GROUP(fs->super) - overhead;
2146
2147 for (grp = groups; grp < groups+extra_grps; grp++) {
2148 overhead = calc_group_overhead(fs, grp,
2149 old_desc_blocks);
2150
2151 /*
2152 * again, we need to see how much data we cram into
2153 * all of the groups leading up to the last group
2154 */
2155 if (grp != (groups + extra_grps - 1))
2156 last_start += EXT2_BLOCKS_PER_GROUP(fs->super)
2157 - overhead;
2158
2159 data_blocks -= overhead;
2160 }
2161
2162 groups += extra_grps;
2163 extra_groups += extra_grps;
2164 if (fs->super->s_feature_incompat
2165 & EXT4_FEATURE_INCOMPAT_FLEX_BG
2166 && extra_groups > flexbg_size) {
2167 /*
2168 * For ext4 we need to allow for up to a flex_bg worth
2169 * of inode tables of slack space so the resize
2170 * operation can be guaranteed to finish.
2171 */
2172 extra_groups = flexbg_size -
2173 (groups & (flexbg_size - 1));
2174 data_needed += (fs->inode_blocks_per_group *
2175 extra_groups);
2176 extra_groups = groups % flexbg_size;
2177 }
2178 #ifdef RESIZE2FS_DEBUG
2179 if (flags & RESIZE_DEBUG_MIN_CALC)
2180 printf("Added %d extra group(s), "
2181 "data_needed %llu, data_blocks %llu, "
2182 "last_start %llu\n",
2183 extra_grps, data_needed, data_blocks,
2184 last_start);
2185 #endif
2186 }
2187
2188 /* now for the fun voodoo */
2189 overhead = calc_group_overhead(fs, groups-1, old_desc_blocks);
2190 #ifdef RESIZE2FS_DEBUG
2191 if (flags & RESIZE_DEBUG_MIN_CALC)
2192 printf("Last group's overhead is %llu\n", overhead);
2193 #endif
2194
2195 /*
2196 * if this is the case then the last group is going to have data in it
2197 * so we need to adjust the size of the last group accordingly
2198 */
2199 if (last_start < data_needed) {
2200 blk64_t remainder = data_needed - last_start;
2201
2202 #ifdef RESIZE2FS_DEBUG
2203 if (flags & RESIZE_DEBUG_MIN_CALC)
2204 printf("Need %llu data blocks in last group\n",
2205 remainder);
2206 #endif
2207 /*
2208 * 50 is a magic number that mkfs/resize uses to see if its
2209 * even worth making/resizing the fs. basically you need to
2210 * have at least 50 blocks in addition to the blocks needed
2211 * for the metadata in the last group
2212 */
2213 if (remainder > 50)
2214 overhead += remainder;
2215 else
2216 overhead += 50;
2217 } else
2218 overhead += 50;
2219
2220 overhead += fs->super->s_first_data_block;
2221 #ifdef RESIZE2FS_DEBUG
2222 if (flags & RESIZE_DEBUG_MIN_CALC)
2223 printf("Final size of last group is %lld\n", overhead);
2224 #endif
2225
2226 /*
2227 * since our last group doesn't have to be BLOCKS_PER_GROUP large, we
2228 * only do groups-1, and then add the number of blocks needed to
2229 * handle the group descriptor metadata+data that we need
2230 */
2231 blks_needed = (groups-1) * EXT2_BLOCKS_PER_GROUP(fs->super);
2232 blks_needed += overhead;
2233
2234 /*
2235 * Make sure blks_needed covers the end of the inode table in
2236 * the last block group.
2237 */
2238 overhead = ext2fs_inode_table_loc(fs, groups-1) +
2239 fs->inode_blocks_per_group;
2240 if (blks_needed < overhead)
2241 blks_needed = overhead;
2242
2243 #ifdef RESIZE2FS_DEBUG
2244 if (flags & RESIZE_DEBUG_MIN_CALC)
2245 printf("Estimated blocks needed: %llu\n", blks_needed);
2246 #endif
2247
2248 /*
2249 * If at this point we've already added up more "needed" than
2250 * the current size, just return current size as minimum.
2251 */
2252 if (blks_needed >= ext2fs_blocks_count(fs->super))
2253 return ext2fs_blocks_count(fs->super);
2254 /*
2255 * We need to reserve a few extra blocks if extents are
2256 * enabled, in case we need to grow the extent tree. The more
2257 * we shrink the file system, the more space we need.
2258 */
2259 if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
2260 blk64_t safe_margin = (ext2fs_blocks_count(fs->super) -
2261 blks_needed)/500;
2262 #ifdef RESIZE2FS_DEBUG
2263 if (flags & RESIZE_DEBUG_MIN_CALC)
2264 printf("Extents safety margin: %llu\n", safe_margin);
2265 #endif
2266 blks_needed += safe_margin;
2267 }
2268
2269 return blks_needed;
2270 }
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