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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 "resize2fs.h"
37 #include <time.h>
38
39 #ifdef __linux__ /* Kludge for debugging */
40 #define RESIZE2FS_DEBUG
41 #endif
42
43 static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size);
44 static errcode_t blocks_to_move(ext2_resize_t rfs);
45 static errcode_t block_mover(ext2_resize_t rfs);
46 static errcode_t inode_scan_and_fix(ext2_resize_t rfs);
47 static errcode_t inode_ref_fix(ext2_resize_t rfs);
48 static errcode_t move_itables(ext2_resize_t rfs);
49 static errcode_t fix_resize_inode(ext2_filsys fs);
50 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs);
51
52 /*
53 * Some helper CPP macros
54 */
55 #define FS_BLOCK_BM(fs, i) ((fs)->group_desc[(i)].bg_block_bitmap)
56 #define FS_INODE_BM(fs, i) ((fs)->group_desc[(i)].bg_inode_bitmap)
57 #define FS_INODE_TB(fs, i) ((fs)->group_desc[(i)].bg_inode_table)
58
59 #define IS_BLOCK_BM(fs, i, blk) ((blk) == FS_BLOCK_BM((fs),(i)))
60 #define IS_INODE_BM(fs, i, blk) ((blk) == FS_INODE_BM((fs),(i)))
61
62 #define IS_INODE_TB(fs, i, blk) (((blk) >= FS_INODE_TB((fs), (i))) && \
63 ((blk) < (FS_INODE_TB((fs), (i)) + \
64 (fs)->inode_blocks_per_group)))
65
66
67
68 /*
69 * This is the top-level routine which does the dirty deed....
70 */
71 errcode_t resize_fs(ext2_filsys fs, blk_t *new_size, int flags,
72 errcode_t (*progress)(ext2_resize_t rfs, int pass,
73 unsigned long cur,
74 unsigned long max_val))
75 {
76 ext2_resize_t rfs;
77 errcode_t retval;
78
79 retval = ext2fs_read_bitmaps(fs);
80 if (retval)
81 return retval;
82
83 /*
84 * Create the data structure
85 */
86 retval = ext2fs_get_mem(sizeof(struct ext2_resize_struct), &rfs);
87 if (retval)
88 return retval;
89 memset(rfs, 0, sizeof(struct ext2_resize_struct));
90
91 rfs->old_fs = fs;
92 rfs->flags = flags;
93 rfs->itable_buf = 0;
94 rfs->progress = progress;
95 retval = ext2fs_dup_handle(fs, &rfs->new_fs);
96 if (retval)
97 goto errout;
98
99 retval = adjust_superblock(rfs, *new_size);
100 if (retval)
101 goto errout;
102
103 *new_size = rfs->new_fs->super->s_blocks_count;
104
105 retval = blocks_to_move(rfs);
106 if (retval)
107 goto errout;
108
109 #ifdef RESIZE2FS_DEBUG
110 if (rfs->flags & RESIZE_DEBUG_BMOVE)
111 printf("Number of free blocks: %u/%u, Needed: %d\n",
112 rfs->old_fs->super->s_free_blocks_count,
113 rfs->new_fs->super->s_free_blocks_count,
114 rfs->needed_blocks);
115 #endif
116
117 retval = block_mover(rfs);
118 if (retval)
119 goto errout;
120
121 retval = inode_scan_and_fix(rfs);
122 if (retval)
123 goto errout;
124
125 retval = inode_ref_fix(rfs);
126 if (retval)
127 goto errout;
128
129 retval = move_itables(rfs);
130 if (retval)
131 goto errout;
132
133 retval = ext2fs_calculate_summary_stats(rfs->new_fs);
134 if (retval)
135 goto errout;
136
137 retval = fix_resize_inode(rfs->new_fs);
138 if (retval)
139 goto errout;
140
141 rfs->new_fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
142 retval = ext2fs_close(rfs->new_fs);
143 if (retval)
144 goto errout;
145
146 rfs->flags = flags;
147
148 ext2fs_free(rfs->old_fs);
149 if (rfs->itable_buf)
150 ext2fs_free_mem(&rfs->itable_buf);
151 ext2fs_free_mem(&rfs);
152
153 return 0;
154
155 errout:
156 if (rfs->new_fs)
157 ext2fs_free(rfs->new_fs);
158 if (rfs->itable_buf)
159 ext2fs_free_mem(&rfs->itable_buf);
160 ext2fs_free_mem(&rfs);
161 return retval;
162 }
163
164 /* --------------------------------------------------------------------
165 *
166 * Resize processing, phase 1.
167 *
168 * In this phase we adjust the in-memory superblock information, and
169 * initialize any new parts of the inode table. The new parts of the
170 * inode table are created in virgin disk space, so we can abort here
171 * without any side effects.
172 * --------------------------------------------------------------------
173 */
174
175 /*
176 * This routine is shared by the online and offline resize routines.
177 * All of the information which is adjusted in memory is done here.
178 */
179 errcode_t adjust_fs_info(ext2_filsys fs, ext2_filsys old_fs, blk_t new_size)
180 {
181 errcode_t retval;
182 int overhead = 0;
183 int rem;
184 blk_t blk, group_block;
185 ext2_ino_t real_end;
186 int adj, old_numblocks, numblocks, adjblocks;
187 unsigned long i, j, old_desc_blocks, max_group;
188 unsigned int meta_bg, meta_bg_size;
189 int has_super;
190 unsigned long long new_inodes; /* u64 to check for overflow */
191
192 fs->super->s_blocks_count = new_size;
193
194 retry:
195 fs->group_desc_count = ext2fs_div_ceil(fs->super->s_blocks_count -
196 fs->super->s_first_data_block,
197 EXT2_BLOCKS_PER_GROUP(fs->super));
198 if (fs->group_desc_count == 0)
199 return EXT2_ET_TOOSMALL;
200 fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
201 EXT2_DESC_PER_BLOCK(fs->super));
202
203 /*
204 * Overhead is the number of bookkeeping blocks per group. It
205 * includes the superblock backup, the group descriptor
206 * backups, the inode bitmap, the block bitmap, and the inode
207 * table.
208 */
209 overhead = (int) (2 + fs->inode_blocks_per_group);
210
211 if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
212 overhead += 1 + fs->desc_blocks +
213 fs->super->s_reserved_gdt_blocks;
214
215 /*
216 * See if the last group is big enough to support the
217 * necessary data structures. If not, we need to get rid of
218 * it.
219 */
220 rem = (fs->super->s_blocks_count - fs->super->s_first_data_block) %
221 fs->super->s_blocks_per_group;
222 if ((fs->group_desc_count == 1) && rem && (rem < overhead))
223 return EXT2_ET_TOOSMALL;
224 if (rem && (rem < overhead+50)) {
225 fs->super->s_blocks_count -= rem;
226 goto retry;
227 }
228 /*
229 * Adjust the number of inodes
230 */
231 new_inodes =(unsigned long long) fs->super->s_inodes_per_group * fs->group_desc_count;
232 if (new_inodes > ~0U) {
233 fprintf(stderr, _("inodes (%llu) must be less than %u"),
234 new_inodes, ~0U);
235 return EXT2_ET_TOO_MANY_INODES;
236 }
237 fs->super->s_inodes_count = fs->super->s_inodes_per_group *
238 fs->group_desc_count;
239
240 /*
241 * Adjust the number of free blocks
242 */
243 blk = old_fs->super->s_blocks_count;
244 if (blk > fs->super->s_blocks_count)
245 fs->super->s_free_blocks_count -=
246 (blk - fs->super->s_blocks_count);
247 else
248 fs->super->s_free_blocks_count +=
249 (fs->super->s_blocks_count - blk);
250
251 /*
252 * Adjust the number of reserved blocks
253 */
254 blk = (__u64)old_fs->super->s_r_blocks_count * 100 /
255 old_fs->super->s_blocks_count;
256 fs->super->s_r_blocks_count = e2p_percent(blk,
257 fs->super->s_blocks_count);
258
259 /*
260 * Adjust the bitmaps for size
261 */
262 retval = ext2fs_resize_inode_bitmap(fs->super->s_inodes_count,
263 fs->super->s_inodes_count,
264 fs->inode_map);
265 if (retval) goto errout;
266
267 real_end = ((EXT2_BLOCKS_PER_GROUP(fs->super)
268 * fs->group_desc_count)) - 1 +
269 fs->super->s_first_data_block;
270 retval = ext2fs_resize_block_bitmap(fs->super->s_blocks_count-1,
271 real_end, fs->block_map);
272
273 if (retval) goto errout;
274
275 /*
276 * Reallocate the group descriptors as necessary.
277 */
278 if (old_fs->desc_blocks != fs->desc_blocks) {
279 retval = ext2fs_resize_mem(old_fs->desc_blocks *
280 fs->blocksize,
281 fs->desc_blocks * fs->blocksize,
282 &fs->group_desc);
283 if (retval)
284 goto errout;
285 if (fs->desc_blocks > old_fs->desc_blocks)
286 memset((char *) fs->group_desc +
287 (old_fs->desc_blocks * fs->blocksize), 0,
288 (fs->desc_blocks - old_fs->desc_blocks) *
289 fs->blocksize);
290 }
291
292 /*
293 * If the resize_inode feature is set, and we are changing the
294 * number of descriptor blocks, then adjust
295 * s_reserved_gdt_blocks if possible to avoid needing to move
296 * the inode table either now or in the future.
297 */
298 if ((fs->super->s_feature_compat &
299 EXT2_FEATURE_COMPAT_RESIZE_INODE) &&
300 (old_fs->desc_blocks != fs->desc_blocks)) {
301 int new;
302
303 new = ((int) fs->super->s_reserved_gdt_blocks) +
304 (old_fs->desc_blocks - fs->desc_blocks);
305 if (new < 0)
306 new = 0;
307 if (new > (int) fs->blocksize/4)
308 new = fs->blocksize/4;
309 fs->super->s_reserved_gdt_blocks = new;
310 if (new == 0)
311 fs->super->s_feature_compat &=
312 ~EXT2_FEATURE_COMPAT_RESIZE_INODE;
313 }
314
315 /*
316 * If we are shrinking the number block groups, we're done and
317 * can exit now.
318 */
319 if (old_fs->group_desc_count > fs->group_desc_count) {
320 retval = 0;
321 goto errout;
322 }
323
324 /*
325 * Fix the count of the last (old) block group
326 */
327 old_numblocks = (old_fs->super->s_blocks_count -
328 old_fs->super->s_first_data_block) %
329 old_fs->super->s_blocks_per_group;
330 if (!old_numblocks)
331 old_numblocks = old_fs->super->s_blocks_per_group;
332 if (old_fs->group_desc_count == fs->group_desc_count) {
333 numblocks = (fs->super->s_blocks_count -
334 fs->super->s_first_data_block) %
335 fs->super->s_blocks_per_group;
336 if (!numblocks)
337 numblocks = fs->super->s_blocks_per_group;
338 } else
339 numblocks = fs->super->s_blocks_per_group;
340 i = old_fs->group_desc_count - 1;
341 fs->group_desc[i].bg_free_blocks_count += (numblocks-old_numblocks);
342
343 /*
344 * If the number of block groups is staying the same, we're
345 * done and can exit now. (If the number block groups is
346 * shrinking, we had exited earlier.)
347 */
348 if (old_fs->group_desc_count >= fs->group_desc_count) {
349 retval = 0;
350 goto errout;
351 }
352
353 /*
354 * Initialize the new block group descriptors
355 */
356 group_block = fs->super->s_first_data_block +
357 old_fs->group_desc_count * fs->super->s_blocks_per_group;
358
359 adj = old_fs->group_desc_count;
360 max_group = fs->group_desc_count - adj;
361 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
362 old_desc_blocks = fs->super->s_first_meta_bg;
363 else
364 old_desc_blocks = fs->desc_blocks +
365 fs->super->s_reserved_gdt_blocks;
366 for (i = old_fs->group_desc_count;
367 i < fs->group_desc_count; i++) {
368 memset(&fs->group_desc[i], 0,
369 sizeof(struct ext2_group_desc));
370 adjblocks = 0;
371
372 if (i == fs->group_desc_count-1) {
373 numblocks = (fs->super->s_blocks_count -
374 fs->super->s_first_data_block) %
375 fs->super->s_blocks_per_group;
376 if (!numblocks)
377 numblocks = fs->super->s_blocks_per_group;
378 } else
379 numblocks = fs->super->s_blocks_per_group;
380
381 has_super = ext2fs_bg_has_super(fs, i);
382 if (has_super) {
383 ext2fs_mark_block_bitmap(fs->block_map, group_block);
384 adjblocks++;
385 }
386 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
387 meta_bg = i / meta_bg_size;
388 if (!(fs->super->s_feature_incompat &
389 EXT2_FEATURE_INCOMPAT_META_BG) ||
390 (meta_bg < fs->super->s_first_meta_bg)) {
391 if (has_super) {
392 for (j=0; j < old_desc_blocks; j++)
393 ext2fs_mark_block_bitmap(fs->block_map,
394 group_block + 1 + j);
395 adjblocks += old_desc_blocks;
396 }
397 } else {
398 if (has_super)
399 has_super = 1;
400 if (((i % meta_bg_size) == 0) ||
401 ((i % meta_bg_size) == 1) ||
402 ((i % meta_bg_size) == (meta_bg_size-1)))
403 ext2fs_mark_block_bitmap(fs->block_map,
404 group_block + has_super);
405 }
406
407 adjblocks += 2 + fs->inode_blocks_per_group;
408
409 numblocks -= adjblocks;
410 fs->super->s_free_blocks_count -= adjblocks;
411 fs->super->s_free_inodes_count +=
412 fs->super->s_inodes_per_group;
413 fs->group_desc[i].bg_free_blocks_count = numblocks;
414 fs->group_desc[i].bg_free_inodes_count =
415 fs->super->s_inodes_per_group;
416 fs->group_desc[i].bg_used_dirs_count = 0;
417
418 retval = ext2fs_allocate_group_table(fs, i, 0);
419 if (retval) goto errout;
420
421 group_block += fs->super->s_blocks_per_group;
422 }
423 retval = 0;
424
425 errout:
426 return (retval);
427 }
428
429 /*
430 * This routine adjusts the superblock and other data structures, both
431 * in disk as well as in memory...
432 */
433 static errcode_t adjust_superblock(ext2_resize_t rfs, blk_t new_size)
434 {
435 ext2_filsys fs;
436 int adj = 0;
437 errcode_t retval;
438 blk_t group_block;
439 unsigned long i;
440 unsigned long max_group;
441
442 fs = rfs->new_fs;
443 ext2fs_mark_super_dirty(fs);
444 ext2fs_mark_bb_dirty(fs);
445 ext2fs_mark_ib_dirty(fs);
446
447 retval = adjust_fs_info(fs, rfs->old_fs, new_size);
448 if (retval)
449 goto errout;
450
451 /*
452 * Check to make sure there are enough inodes
453 */
454 if ((rfs->old_fs->super->s_inodes_count -
455 rfs->old_fs->super->s_free_inodes_count) >
456 rfs->new_fs->super->s_inodes_count) {
457 retval = ENOSPC;
458 goto errout;
459 }
460
461 /*
462 * If we are shrinking the number block groups, we're done and
463 * can exit now.
464 */
465 if (rfs->old_fs->group_desc_count > fs->group_desc_count) {
466 retval = 0;
467 goto errout;
468 }
469
470 /*
471 * If the number of block groups is staying the same, we're
472 * done and can exit now. (If the number block groups is
473 * shrinking, we had exited earlier.)
474 */
475 if (rfs->old_fs->group_desc_count >= fs->group_desc_count) {
476 retval = 0;
477 goto errout;
478 }
479
480 /*
481 * Initialize the new block group descriptors
482 */
483 retval = ext2fs_get_array(fs->blocksize, fs->inode_blocks_per_group,
484 &rfs->itable_buf);
485 if (retval)
486 goto errout;
487
488 memset(rfs->itable_buf, 0, fs->blocksize * fs->inode_blocks_per_group);
489 group_block = fs->super->s_first_data_block +
490 rfs->old_fs->group_desc_count * fs->super->s_blocks_per_group;
491
492 adj = rfs->old_fs->group_desc_count;
493 max_group = fs->group_desc_count - adj;
494 if (rfs->progress) {
495 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
496 0, max_group);
497 if (retval)
498 goto errout;
499 }
500 for (i = rfs->old_fs->group_desc_count;
501 i < fs->group_desc_count; i++) {
502 /*
503 * Write out the new inode table
504 */
505 retval = io_channel_write_blk(fs->io,
506 fs->group_desc[i].bg_inode_table,
507 fs->inode_blocks_per_group,
508 rfs->itable_buf);
509 if (retval) goto errout;
510
511 io_channel_flush(fs->io);
512 if (rfs->progress) {
513 retval = rfs->progress(rfs, E2_RSZ_EXTEND_ITABLE_PASS,
514 i - adj + 1, max_group);
515 if (retval)
516 goto errout;
517 }
518 group_block += fs->super->s_blocks_per_group;
519 }
520 io_channel_flush(fs->io);
521 retval = 0;
522
523 errout:
524 return retval;
525 }
526
527 /* --------------------------------------------------------------------
528 *
529 * Resize processing, phase 2.
530 *
531 * In this phase we adjust determine which blocks need to be moved, in
532 * blocks_to_move(). We then copy the blocks to their ultimate new
533 * destinations using block_mover(). Since we are copying blocks to
534 * their new locations, again during this pass we can abort without
535 * any problems.
536 * --------------------------------------------------------------------
537 */
538
539 /*
540 * This helper function creates a block bitmap with all of the
541 * filesystem meta-data blocks.
542 */
543 static errcode_t mark_table_blocks(ext2_filsys fs,
544 ext2fs_block_bitmap bmap)
545 {
546 blk_t b;
547 unsigned int j;
548 dgrp_t i;
549 unsigned long meta_bg_size;
550 unsigned int old_desc_blocks;
551
552 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
553 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
554 old_desc_blocks = fs->super->s_first_meta_bg;
555 else
556 old_desc_blocks = fs->desc_blocks +
557 fs->super->s_reserved_gdt_blocks;
558 for (i = 0; i < fs->group_desc_count; i++) {
559 ext2fs_reserve_super_and_bgd(fs, i, bmap);
560
561 /*
562 * Mark the blocks used for the inode table
563 */
564 for (j = 0, b = fs->group_desc[i].bg_inode_table;
565 j < (unsigned int) fs->inode_blocks_per_group;
566 j++, b++)
567 ext2fs_mark_block_bitmap(bmap, b);
568
569 /*
570 * Mark block used for the block bitmap
571 */
572 ext2fs_mark_block_bitmap(bmap,
573 fs->group_desc[i].bg_block_bitmap);
574
575 /*
576 * Mark block used for the inode bitmap
577 */
578 ext2fs_mark_block_bitmap(bmap,
579 fs->group_desc[i].bg_inode_bitmap);
580 }
581 return 0;
582 }
583
584 /*
585 * This function checks to see if a particular block (either a
586 * superblock or a block group descriptor) overlaps with an inode or
587 * block bitmap block, or with the inode table.
588 */
589 static void mark_fs_metablock(ext2_resize_t rfs,
590 ext2fs_block_bitmap meta_bmap,
591 int group, blk_t blk)
592 {
593 ext2_filsys fs = rfs->new_fs;
594
595 ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
596 ext2fs_mark_block_bitmap(fs->block_map, blk);
597
598 /*
599 * Check to see if we overlap with the inode or block bitmap,
600 * or the inode tables. If not, and the block is in use, then
601 * mark it as a block to be moved.
602 */
603 if (IS_BLOCK_BM(fs, group, blk)) {
604 FS_BLOCK_BM(fs, group) = 0;
605 rfs->needed_blocks++;
606 } else if (IS_INODE_BM(fs, group, blk)) {
607 FS_INODE_BM(fs, group) = 0;
608 rfs->needed_blocks++;
609 } else if (IS_INODE_TB(fs, group, blk)) {
610 FS_INODE_TB(fs, group) = 0;
611 rfs->needed_blocks++;
612 } else if (ext2fs_test_block_bitmap(rfs->old_fs->block_map, blk) &&
613 !ext2fs_test_block_bitmap(meta_bmap, blk)) {
614 ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
615 rfs->needed_blocks++;
616 }
617 }
618
619
620 /*
621 * This routine marks and unmarks reserved blocks in the new block
622 * bitmap. It also determines which blocks need to be moved and
623 * places this information into the move_blocks bitmap.
624 */
625 static errcode_t blocks_to_move(ext2_resize_t rfs)
626 {
627 int j, has_super;
628 dgrp_t i, max_groups;
629 blk_t blk, group_blk;
630 unsigned long old_blocks, new_blocks;
631 unsigned int meta_bg, meta_bg_size;
632 errcode_t retval;
633 ext2_filsys fs, old_fs;
634 ext2fs_block_bitmap meta_bmap;
635
636 fs = rfs->new_fs;
637 old_fs = rfs->old_fs;
638 if (old_fs->super->s_blocks_count > fs->super->s_blocks_count)
639 fs = rfs->old_fs;
640
641 retval = ext2fs_allocate_block_bitmap(fs, _("reserved blocks"),
642 &rfs->reserve_blocks);
643 if (retval)
644 return retval;
645
646 retval = ext2fs_allocate_block_bitmap(fs, _("blocks to be moved"),
647 &rfs->move_blocks);
648 if (retval)
649 return retval;
650
651 retval = ext2fs_allocate_block_bitmap(fs, _("meta-data blocks"),
652 &meta_bmap);
653 if (retval)
654 return retval;
655
656 retval = mark_table_blocks(old_fs, meta_bmap);
657 if (retval)
658 return retval;
659
660 fs = rfs->new_fs;
661
662 /*
663 * If we're shrinking the filesystem, we need to move all of
664 * the blocks that don't fit any more
665 */
666 for (blk = fs->super->s_blocks_count;
667 blk < old_fs->super->s_blocks_count; blk++) {
668 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
669 !ext2fs_test_block_bitmap(meta_bmap, blk)) {
670 ext2fs_mark_block_bitmap(rfs->move_blocks, blk);
671 rfs->needed_blocks++;
672 }
673 ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
674 }
675
676 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
677 old_blocks = old_fs->super->s_first_meta_bg;
678 new_blocks = fs->super->s_first_meta_bg;
679 } else {
680 old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
681 new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
682 }
683
684 if (old_blocks == new_blocks) {
685 retval = 0;
686 goto errout;
687 }
688
689 max_groups = fs->group_desc_count;
690 if (max_groups > old_fs->group_desc_count)
691 max_groups = old_fs->group_desc_count;
692 group_blk = old_fs->super->s_first_data_block;
693 /*
694 * If we're reducing the number of descriptor blocks, this
695 * makes life easy. :-) We just have to mark some extra
696 * blocks as free.
697 */
698 if (old_blocks > new_blocks) {
699 for (i = 0; i < max_groups; i++) {
700 if (!ext2fs_bg_has_super(fs, i)) {
701 group_blk += fs->super->s_blocks_per_group;
702 continue;
703 }
704 for (blk = group_blk+1+new_blocks;
705 blk < group_blk+1+old_blocks; blk++) {
706 ext2fs_unmark_block_bitmap(fs->block_map,
707 blk);
708 rfs->needed_blocks--;
709 }
710 group_blk += fs->super->s_blocks_per_group;
711 }
712 retval = 0;
713 goto errout;
714 }
715 /*
716 * If we're increasing the number of descriptor blocks, life
717 * gets interesting....
718 */
719 meta_bg_size = EXT2_DESC_PER_BLOCK(fs->super);
720 for (i = 0; i < max_groups; i++) {
721 has_super = ext2fs_bg_has_super(fs, i);
722 if (has_super)
723 mark_fs_metablock(rfs, meta_bmap, i, group_blk);
724
725 meta_bg = i / meta_bg_size;
726 if (!(fs->super->s_feature_incompat &
727 EXT2_FEATURE_INCOMPAT_META_BG) ||
728 (meta_bg < fs->super->s_first_meta_bg)) {
729 if (has_super) {
730 for (blk = group_blk+1;
731 blk < group_blk + 1 + new_blocks; blk++)
732 mark_fs_metablock(rfs, meta_bmap,
733 i, blk);
734 }
735 } else {
736 if (has_super)
737 has_super = 1;
738 if (((i % meta_bg_size) == 0) ||
739 ((i % meta_bg_size) == 1) ||
740 ((i % meta_bg_size) == (meta_bg_size-1)))
741 mark_fs_metablock(rfs, meta_bmap, i,
742 group_blk + has_super);
743 }
744
745 if (fs->group_desc[i].bg_inode_table &&
746 fs->group_desc[i].bg_inode_bitmap &&
747 fs->group_desc[i].bg_block_bitmap)
748 goto next_group;
749
750 /*
751 * Reserve the existing meta blocks that we know
752 * aren't to be moved.
753 */
754 if (fs->group_desc[i].bg_block_bitmap)
755 ext2fs_mark_block_bitmap(rfs->reserve_blocks,
756 fs->group_desc[i].bg_block_bitmap);
757 if (fs->group_desc[i].bg_inode_bitmap)
758 ext2fs_mark_block_bitmap(rfs->reserve_blocks,
759 fs->group_desc[i].bg_inode_bitmap);
760 if (fs->group_desc[i].bg_inode_table)
761 for (blk = fs->group_desc[i].bg_inode_table, j=0;
762 j < fs->inode_blocks_per_group ; j++, blk++)
763 ext2fs_mark_block_bitmap(rfs->reserve_blocks,
764 blk);
765
766 /*
767 * Allocate the missing data structures
768 */
769 retval = ext2fs_allocate_group_table(fs, i,
770 rfs->reserve_blocks);
771 if (retval)
772 goto errout;
773
774 /*
775 * For those structures that have changed, we need to
776 * do bookkeepping.
777 */
778 if (FS_BLOCK_BM(old_fs, i) !=
779 (blk = FS_BLOCK_BM(fs, i))) {
780 ext2fs_mark_block_bitmap(fs->block_map, blk);
781 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
782 !ext2fs_test_block_bitmap(meta_bmap, blk))
783 ext2fs_mark_block_bitmap(rfs->move_blocks,
784 blk);
785 }
786 if (FS_INODE_BM(old_fs, i) !=
787 (blk = FS_INODE_BM(fs, i))) {
788 ext2fs_mark_block_bitmap(fs->block_map, blk);
789 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
790 !ext2fs_test_block_bitmap(meta_bmap, blk))
791 ext2fs_mark_block_bitmap(rfs->move_blocks,
792 blk);
793 }
794
795 /*
796 * The inode table, if we need to relocate it, is
797 * handled specially. We have to reserve the blocks
798 * for both the old and the new inode table, since we
799 * can't have the inode table be destroyed during the
800 * block relocation phase.
801 */
802 if (FS_INODE_TB(fs, i) == FS_INODE_TB(old_fs, i))
803 goto next_group; /* inode table not moved */
804
805 rfs->needed_blocks += fs->inode_blocks_per_group;
806
807 /*
808 * Mark the new inode table as in use in the new block
809 * allocation bitmap, and move any blocks that might
810 * be necessary.
811 */
812 for (blk = fs->group_desc[i].bg_inode_table, j=0;
813 j < fs->inode_blocks_per_group ; j++, blk++) {
814 ext2fs_mark_block_bitmap(fs->block_map, blk);
815 if (ext2fs_test_block_bitmap(old_fs->block_map, blk) &&
816 !ext2fs_test_block_bitmap(meta_bmap, blk))
817 ext2fs_mark_block_bitmap(rfs->move_blocks,
818 blk);
819 }
820
821 /*
822 * Make sure the old inode table is reserved in the
823 * block reservation bitmap.
824 */
825 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
826 j < fs->inode_blocks_per_group ; j++, blk++)
827 ext2fs_mark_block_bitmap(rfs->reserve_blocks, blk);
828
829 next_group:
830 group_blk += rfs->new_fs->super->s_blocks_per_group;
831 }
832 retval = 0;
833
834 errout:
835 if (meta_bmap)
836 ext2fs_free_block_bitmap(meta_bmap);
837
838 return retval;
839 }
840
841 /*
842 * This helper function tries to allocate a new block. We try to
843 * avoid hitting the original group descriptor blocks at least at
844 * first, since we want to make it possible to recover from a badly
845 * aborted resize operation as much as possible.
846 *
847 * In the future, I may further modify this routine to balance out
848 * where we get the new blocks across the various block groups.
849 * Ideally we would allocate blocks that corresponded with the block
850 * group of the containing inode, and keep contiguous blocks
851 * together. However, this very difficult to do efficiently, since we
852 * don't have the necessary information up front.
853 */
854
855 #define AVOID_OLD 1
856 #define DESPERATION 2
857
858 static void init_block_alloc(ext2_resize_t rfs)
859 {
860 rfs->alloc_state = AVOID_OLD;
861 rfs->new_blk = rfs->new_fs->super->s_first_data_block;
862 #if 0
863 /* HACK for testing */
864 if (rfs->new_fs->super->s_blocks_count >
865 rfs->old_fs->super->s_blocks_count)
866 rfs->new_blk = rfs->old_fs->super->s_blocks_count;
867 #endif
868 }
869
870 static blk_t get_new_block(ext2_resize_t rfs)
871 {
872 ext2_filsys fs = rfs->new_fs;
873
874 while (1) {
875 if (rfs->new_blk >= fs->super->s_blocks_count) {
876 if (rfs->alloc_state == DESPERATION)
877 return 0;
878
879 #ifdef RESIZE2FS_DEBUG
880 if (rfs->flags & RESIZE_DEBUG_BMOVE)
881 printf("Going into desperation mode "
882 "for block allocations\n");
883 #endif
884 rfs->alloc_state = DESPERATION;
885 rfs->new_blk = fs->super->s_first_data_block;
886 continue;
887 }
888 if (ext2fs_test_block_bitmap(fs->block_map, rfs->new_blk) ||
889 ext2fs_test_block_bitmap(rfs->reserve_blocks,
890 rfs->new_blk) ||
891 ((rfs->alloc_state == AVOID_OLD) &&
892 (rfs->new_blk < rfs->old_fs->super->s_blocks_count) &&
893 ext2fs_test_block_bitmap(rfs->old_fs->block_map,
894 rfs->new_blk))) {
895 rfs->new_blk++;
896 continue;
897 }
898 return rfs->new_blk;
899 }
900 }
901
902 static errcode_t block_mover(ext2_resize_t rfs)
903 {
904 blk_t blk, old_blk, new_blk;
905 ext2_filsys fs = rfs->new_fs;
906 ext2_filsys old_fs = rfs->old_fs;
907 errcode_t retval;
908 int size, c;
909 int to_move, moved;
910 ext2_badblocks_list badblock_list = 0;
911 int bb_modified = 0;
912
913 retval = ext2fs_read_bb_inode(old_fs, &badblock_list);
914 if (retval)
915 return retval;
916
917 new_blk = fs->super->s_first_data_block;
918 if (!rfs->itable_buf) {
919 retval = ext2fs_get_array(fs->blocksize,
920 fs->inode_blocks_per_group,
921 &rfs->itable_buf);
922 if (retval)
923 return retval;
924 }
925 retval = ext2fs_create_extent_table(&rfs->bmap, 0);
926 if (retval)
927 return retval;
928
929 /*
930 * The first step is to figure out where all of the blocks
931 * will go.
932 */
933 to_move = moved = 0;
934 init_block_alloc(rfs);
935 for (blk = old_fs->super->s_first_data_block;
936 blk < old_fs->super->s_blocks_count; blk++) {
937 if (!ext2fs_test_block_bitmap(old_fs->block_map, blk))
938 continue;
939 if (!ext2fs_test_block_bitmap(rfs->move_blocks, blk))
940 continue;
941 if (ext2fs_badblocks_list_test(badblock_list, blk)) {
942 ext2fs_badblocks_list_del(badblock_list, blk);
943 bb_modified++;
944 continue;
945 }
946
947 new_blk = get_new_block(rfs);
948 if (!new_blk) {
949 retval = ENOSPC;
950 goto errout;
951 }
952 ext2fs_mark_block_bitmap(fs->block_map, new_blk);
953 ext2fs_add_extent_entry(rfs->bmap, blk, new_blk);
954 to_move++;
955 }
956
957 if (to_move == 0) {
958 if (rfs->bmap) {
959 ext2fs_free_extent_table(rfs->bmap);
960 rfs->bmap = 0;
961 }
962 retval = 0;
963 goto errout;
964 }
965
966 /*
967 * Step two is to actually move the blocks
968 */
969 retval = ext2fs_iterate_extent(rfs->bmap, 0, 0, 0);
970 if (retval) goto errout;
971
972 if (rfs->progress) {
973 retval = (rfs->progress)(rfs, E2_RSZ_BLOCK_RELOC_PASS,
974 0, to_move);
975 if (retval)
976 goto errout;
977 }
978 while (1) {
979 retval = ext2fs_iterate_extent(rfs->bmap, &old_blk, &new_blk, &size);
980 if (retval) goto errout;
981 if (!size)
982 break;
983 #ifdef RESIZE2FS_DEBUG
984 if (rfs->flags & RESIZE_DEBUG_BMOVE)
985 printf("Moving %d blocks %u->%u\n",
986 size, old_blk, new_blk);
987 #endif
988 do {
989 c = size;
990 if (c > fs->inode_blocks_per_group)
991 c = fs->inode_blocks_per_group;
992 retval = io_channel_read_blk(fs->io, old_blk, c,
993 rfs->itable_buf);
994 if (retval) goto errout;
995 retval = io_channel_write_blk(fs->io, new_blk, c,
996 rfs->itable_buf);
997 if (retval) goto errout;
998 size -= c;
999 new_blk += c;
1000 old_blk += c;
1001 moved += c;
1002 if (rfs->progress) {
1003 io_channel_flush(fs->io);
1004 retval = (rfs->progress)(rfs,
1005 E2_RSZ_BLOCK_RELOC_PASS,
1006 moved, to_move);
1007 if (retval)
1008 goto errout;
1009 }
1010 } while (size > 0);
1011 io_channel_flush(fs->io);
1012 }
1013
1014 errout:
1015 if (badblock_list) {
1016 if (!retval && bb_modified)
1017 retval = ext2fs_update_bb_inode(old_fs,
1018 badblock_list);
1019 ext2fs_badblocks_list_free(badblock_list);
1020 }
1021 return retval;
1022 }
1023
1024
1025 /* --------------------------------------------------------------------
1026 *
1027 * Resize processing, phase 3
1028 *
1029 * --------------------------------------------------------------------
1030 */
1031
1032
1033 struct process_block_struct {
1034 ext2_resize_t rfs;
1035 ext2_ino_t ino;
1036 struct ext2_inode * inode;
1037 errcode_t error;
1038 int is_dir;
1039 int changed;
1040 };
1041
1042 static int process_block(ext2_filsys fs, blk_t *block_nr,
1043 e2_blkcnt_t blockcnt,
1044 blk_t ref_block EXT2FS_ATTR((unused)),
1045 int ref_offset EXT2FS_ATTR((unused)), void *priv_data)
1046 {
1047 struct process_block_struct *pb;
1048 errcode_t retval;
1049 blk_t block, new_block;
1050 int ret = 0;
1051
1052 pb = (struct process_block_struct *) priv_data;
1053 block = *block_nr;
1054 if (pb->rfs->bmap) {
1055 new_block = ext2fs_extent_translate(pb->rfs->bmap, block);
1056 if (new_block) {
1057 *block_nr = new_block;
1058 ret |= BLOCK_CHANGED;
1059 pb->changed = 1;
1060 #ifdef RESIZE2FS_DEBUG
1061 if (pb->rfs->flags & RESIZE_DEBUG_BMOVE)
1062 printf("ino=%u, blockcnt=%lld, %u->%u\n",
1063 pb->ino, blockcnt, block, new_block);
1064 #endif
1065 block = new_block;
1066 }
1067 }
1068 if (pb->is_dir) {
1069 retval = ext2fs_add_dir_block(fs->dblist, pb->ino,
1070 block, (int) blockcnt);
1071 if (retval) {
1072 pb->error = retval;
1073 ret |= BLOCK_ABORT;
1074 }
1075 }
1076 return ret;
1077 }
1078
1079 /*
1080 * Progress callback
1081 */
1082 static errcode_t progress_callback(ext2_filsys fs,
1083 ext2_inode_scan scan EXT2FS_ATTR((unused)),
1084 dgrp_t group, void * priv_data)
1085 {
1086 ext2_resize_t rfs = (ext2_resize_t) priv_data;
1087 errcode_t retval;
1088
1089 /*
1090 * This check is to protect against old ext2 libraries. It
1091 * shouldn't be needed against new libraries.
1092 */
1093 if ((group+1) == 0)
1094 return 0;
1095
1096 if (rfs->progress) {
1097 io_channel_flush(fs->io);
1098 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1099 group+1, fs->group_desc_count);
1100 if (retval)
1101 return retval;
1102 }
1103
1104 return 0;
1105 }
1106
1107 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
1108 {
1109 struct process_block_struct pb;
1110 ext2_ino_t ino, new_inode;
1111 struct ext2_inode inode;
1112 ext2_inode_scan scan = NULL;
1113 errcode_t retval;
1114 int group;
1115 char *block_buf = 0;
1116 ext2_ino_t start_to_move;
1117 blk_t orig_size, new_block;
1118
1119 if ((rfs->old_fs->group_desc_count <=
1120 rfs->new_fs->group_desc_count) &&
1121 !rfs->bmap)
1122 return 0;
1123
1124 /*
1125 * Save the original size of the old filesystem, and
1126 * temporarily set the size to be the new size if the new size
1127 * is larger. We need to do this to avoid catching an error
1128 * by the block iterator routines
1129 */
1130 orig_size = rfs->old_fs->super->s_blocks_count;
1131 if (orig_size < rfs->new_fs->super->s_blocks_count)
1132 rfs->old_fs->super->s_blocks_count =
1133 rfs->new_fs->super->s_blocks_count;
1134
1135 retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
1136 if (retval) goto errout;
1137
1138 retval = ext2fs_init_dblist(rfs->old_fs, 0);
1139 if (retval) goto errout;
1140 retval = ext2fs_get_array(rfs->old_fs->blocksize, 3, &block_buf);
1141 if (retval) goto errout;
1142
1143 start_to_move = (rfs->new_fs->group_desc_count *
1144 rfs->new_fs->super->s_inodes_per_group);
1145
1146 if (rfs->progress) {
1147 retval = (rfs->progress)(rfs, E2_RSZ_INODE_SCAN_PASS,
1148 0, rfs->old_fs->group_desc_count);
1149 if (retval)
1150 goto errout;
1151 }
1152 ext2fs_set_inode_callback(scan, progress_callback, (void *) rfs);
1153 pb.rfs = rfs;
1154 pb.inode = &inode;
1155 pb.error = 0;
1156 new_inode = EXT2_FIRST_INODE(rfs->new_fs->super);
1157 /*
1158 * First, copy all of the inodes that need to be moved
1159 * elsewhere in the inode table
1160 */
1161 while (1) {
1162 retval = ext2fs_get_next_inode(scan, &ino, &inode);
1163 if (retval) goto errout;
1164 if (!ino)
1165 break;
1166
1167 if (inode.i_links_count == 0 && ino != EXT2_RESIZE_INO)
1168 continue; /* inode not in use */
1169
1170 pb.is_dir = LINUX_S_ISDIR(inode.i_mode);
1171 pb.changed = 0;
1172
1173 if (inode.i_file_acl && rfs->bmap) {
1174 new_block = ext2fs_extent_translate(rfs->bmap,
1175 inode.i_file_acl);
1176 if (new_block) {
1177 inode.i_file_acl = new_block;
1178 retval = ext2fs_write_inode(rfs->old_fs,
1179 ino, &inode);
1180 if (retval) goto errout;
1181 }
1182 }
1183
1184 if (ext2fs_inode_has_valid_blocks(&inode) &&
1185 (rfs->bmap || pb.is_dir)) {
1186 pb.ino = ino;
1187 retval = ext2fs_block_iterate2(rfs->old_fs,
1188 ino, 0, block_buf,
1189 process_block, &pb);
1190 if (retval)
1191 goto errout;
1192 if (pb.error) {
1193 retval = pb.error;
1194 goto errout;
1195 }
1196 }
1197
1198 if (ino <= start_to_move)
1199 continue; /* Don't need to move it. */
1200
1201 /*
1202 * Find a new inode
1203 */
1204 while (1) {
1205 if (!ext2fs_test_inode_bitmap(rfs->new_fs->inode_map,
1206 new_inode))
1207 break;
1208 new_inode++;
1209 if (new_inode > rfs->new_fs->super->s_inodes_count) {
1210 retval = ENOSPC;
1211 goto errout;
1212 }
1213 }
1214 ext2fs_mark_inode_bitmap(rfs->new_fs->inode_map, new_inode);
1215 if (pb.changed) {
1216 /* Get the new version of the inode */
1217 retval = ext2fs_read_inode(rfs->old_fs, ino, &inode);
1218 if (retval) goto errout;
1219 }
1220 inode.i_ctime = time(0);
1221 retval = ext2fs_write_inode(rfs->old_fs, new_inode, &inode);
1222 if (retval) goto errout;
1223
1224 group = (new_inode-1) / EXT2_INODES_PER_GROUP(rfs->new_fs->super);
1225 if (LINUX_S_ISDIR(inode.i_mode))
1226 rfs->new_fs->group_desc[group].bg_used_dirs_count++;
1227
1228 #ifdef RESIZE2FS_DEBUG
1229 if (rfs->flags & RESIZE_DEBUG_INODEMAP)
1230 printf("Inode moved %u->%u\n", ino, new_inode);
1231 #endif
1232 if (!rfs->imap) {
1233 retval = ext2fs_create_extent_table(&rfs->imap, 0);
1234 if (retval)
1235 goto errout;
1236 }
1237 ext2fs_add_extent_entry(rfs->imap, ino, new_inode);
1238 }
1239 io_channel_flush(rfs->old_fs->io);
1240
1241 errout:
1242 rfs->old_fs->super->s_blocks_count = orig_size;
1243 if (rfs->bmap) {
1244 ext2fs_free_extent_table(rfs->bmap);
1245 rfs->bmap = 0;
1246 }
1247 if (scan)
1248 ext2fs_close_inode_scan(scan);
1249 if (block_buf)
1250 ext2fs_free_mem(&block_buf);
1251 return retval;
1252 }
1253
1254 /* --------------------------------------------------------------------
1255 *
1256 * Resize processing, phase 4.
1257 *
1258 * --------------------------------------------------------------------
1259 */
1260
1261 struct istruct {
1262 ext2_resize_t rfs;
1263 errcode_t err;
1264 unsigned long max_dirs;
1265 int num;
1266 };
1267
1268 static int check_and_change_inodes(ext2_ino_t dir,
1269 int entry EXT2FS_ATTR((unused)),
1270 struct ext2_dir_entry *dirent, int offset,
1271 int blocksize EXT2FS_ATTR((unused)),
1272 char *buf EXT2FS_ATTR((unused)),
1273 void *priv_data)
1274 {
1275 struct istruct *is = (struct istruct *) priv_data;
1276 struct ext2_inode inode;
1277 ext2_ino_t new_inode;
1278 errcode_t retval;
1279
1280 if (is->rfs->progress && offset == 0) {
1281 io_channel_flush(is->rfs->old_fs->io);
1282 is->err = (is->rfs->progress)(is->rfs,
1283 E2_RSZ_INODE_REF_UPD_PASS,
1284 ++is->num, is->max_dirs);
1285 if (is->err)
1286 return DIRENT_ABORT;
1287 }
1288
1289 if (!dirent->inode)
1290 return 0;
1291
1292 new_inode = ext2fs_extent_translate(is->rfs->imap, dirent->inode);
1293
1294 if (!new_inode)
1295 return 0;
1296 #ifdef RESIZE2FS_DEBUG
1297 if (is->rfs->flags & RESIZE_DEBUG_INODEMAP)
1298 printf("Inode translate (dir=%u, name=%.*s, %u->%u)\n",
1299 dir, dirent->name_len&0xFF, dirent->name,
1300 dirent->inode, new_inode);
1301 #endif
1302
1303 dirent->inode = new_inode;
1304
1305 /* Update the directory mtime and ctime */
1306 retval = ext2fs_read_inode(is->rfs->old_fs, dir, &inode);
1307 if (retval == 0) {
1308 inode.i_mtime = inode.i_ctime = time(0);
1309 is->err = ext2fs_write_inode(is->rfs->old_fs, dir, &inode);
1310 if (is->err)
1311 return DIRENT_ABORT;
1312 }
1313
1314 return DIRENT_CHANGED;
1315 }
1316
1317 static errcode_t inode_ref_fix(ext2_resize_t rfs)
1318 {
1319 errcode_t retval;
1320 struct istruct is;
1321
1322 if (!rfs->imap)
1323 return 0;
1324
1325 /*
1326 * Now, we iterate over all of the directories to update the
1327 * inode references
1328 */
1329 is.num = 0;
1330 is.max_dirs = ext2fs_dblist_count(rfs->old_fs->dblist);
1331 is.rfs = rfs;
1332 is.err = 0;
1333
1334 if (rfs->progress) {
1335 retval = (rfs->progress)(rfs, E2_RSZ_INODE_REF_UPD_PASS,
1336 0, is.max_dirs);
1337 if (retval)
1338 goto errout;
1339 }
1340
1341 retval = ext2fs_dblist_dir_iterate(rfs->old_fs->dblist,
1342 DIRENT_FLAG_INCLUDE_EMPTY, 0,
1343 check_and_change_inodes, &is);
1344 if (retval)
1345 goto errout;
1346 if (is.err) {
1347 retval = is.err;
1348 goto errout;
1349 }
1350
1351 errout:
1352 ext2fs_free_extent_table(rfs->imap);
1353 rfs->imap = 0;
1354 return retval;
1355 }
1356
1357
1358 /* --------------------------------------------------------------------
1359 *
1360 * Resize processing, phase 5.
1361 *
1362 * In this phase we actually move the inode table around, and then
1363 * update the summary statistics. This is scary, since aborting here
1364 * will potentially scramble the filesystem. (We are moving the
1365 * inode tables around in place, and so the potential for lost data,
1366 * or at the very least scrambling the mapping between filenames and
1367 * inode numbers is very high in case of a power failure here.)
1368 * --------------------------------------------------------------------
1369 */
1370
1371
1372 /*
1373 * A very scary routine --- this one moves the inode table around!!!
1374 *
1375 * After this you have to use the rfs->new_fs file handle to read and
1376 * write inodes.
1377 */
1378 static errcode_t move_itables(ext2_resize_t rfs)
1379 {
1380 int n, num, size, diff;
1381 dgrp_t i, max_groups;
1382 ext2_filsys fs = rfs->new_fs;
1383 char *cp;
1384 blk_t old_blk, new_blk, blk;
1385 errcode_t retval;
1386 int j, to_move, moved;
1387
1388 max_groups = fs->group_desc_count;
1389 if (max_groups > rfs->old_fs->group_desc_count)
1390 max_groups = rfs->old_fs->group_desc_count;
1391
1392 size = fs->blocksize * fs->inode_blocks_per_group;
1393 if (!rfs->itable_buf) {
1394 retval = ext2fs_get_mem(size, &rfs->itable_buf);
1395 if (retval)
1396 return retval;
1397 }
1398
1399 /*
1400 * Figure out how many inode tables we need to move
1401 */
1402 to_move = moved = 0;
1403 for (i=0; i < max_groups; i++)
1404 if (rfs->old_fs->group_desc[i].bg_inode_table !=
1405 fs->group_desc[i].bg_inode_table)
1406 to_move++;
1407
1408 if (to_move == 0)
1409 return 0;
1410
1411 if (rfs->progress) {
1412 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1413 0, to_move);
1414 if (retval)
1415 goto errout;
1416 }
1417
1418 rfs->old_fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
1419
1420 for (i=0; i < max_groups; i++) {
1421 old_blk = rfs->old_fs->group_desc[i].bg_inode_table;
1422 new_blk = fs->group_desc[i].bg_inode_table;
1423 diff = new_blk - old_blk;
1424
1425 #ifdef RESIZE2FS_DEBUG
1426 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1427 printf("Itable move group %d block %u->%u (diff %d)\n",
1428 i, old_blk, new_blk, diff);
1429 #endif
1430
1431 if (!diff)
1432 continue;
1433
1434 retval = io_channel_read_blk(fs->io, old_blk,
1435 fs->inode_blocks_per_group,
1436 rfs->itable_buf);
1437 if (retval)
1438 goto errout;
1439 /*
1440 * The end of the inode table segment often contains
1441 * all zeros, and we're often only moving the inode
1442 * table down a block or two. If so, we can optimize
1443 * things by not rewriting blocks that we know to be zero
1444 * already.
1445 */
1446 for (cp = rfs->itable_buf+size-1, n=0; n < size; n++, cp--)
1447 if (*cp)
1448 break;
1449 n = n >> EXT2_BLOCK_SIZE_BITS(fs->super);
1450 #ifdef RESIZE2FS_DEBUG
1451 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1452 printf("%d blocks of zeros...\n", n);
1453 #endif
1454 num = fs->inode_blocks_per_group;
1455 if (n > diff)
1456 num -= n;
1457
1458 retval = io_channel_write_blk(fs->io, new_blk,
1459 num, rfs->itable_buf);
1460 if (retval) {
1461 io_channel_write_blk(fs->io, old_blk,
1462 num, rfs->itable_buf);
1463 goto errout;
1464 }
1465 if (n > diff) {
1466 retval = io_channel_write_blk(fs->io,
1467 old_blk + fs->inode_blocks_per_group,
1468 diff, (rfs->itable_buf +
1469 (fs->inode_blocks_per_group - diff) *
1470 fs->blocksize));
1471 if (retval)
1472 goto errout;
1473 }
1474
1475 for (blk = rfs->old_fs->group_desc[i].bg_inode_table, j=0;
1476 j < fs->inode_blocks_per_group ; j++, blk++)
1477 ext2fs_unmark_block_bitmap(fs->block_map, blk);
1478
1479 rfs->old_fs->group_desc[i].bg_inode_table = new_blk;
1480 ext2fs_mark_super_dirty(rfs->old_fs);
1481 ext2fs_flush(rfs->old_fs);
1482
1483 if (rfs->progress) {
1484 retval = rfs->progress(rfs, E2_RSZ_MOVE_ITABLE_PASS,
1485 ++moved, to_move);
1486 if (retval)
1487 goto errout;
1488 }
1489 }
1490 mark_table_blocks(fs, fs->block_map);
1491 ext2fs_flush(fs);
1492 #ifdef RESIZE2FS_DEBUG
1493 if (rfs->flags & RESIZE_DEBUG_ITABLEMOVE)
1494 printf("Inode table move finished.\n");
1495 #endif
1496 return 0;
1497
1498 errout:
1499 return retval;
1500 }
1501
1502 /*
1503 * Fix the resize inode
1504 */
1505 static errcode_t fix_resize_inode(ext2_filsys fs)
1506 {
1507 struct ext2_inode inode;
1508 errcode_t retval;
1509 char * block_buf;
1510
1511 if (!(fs->super->s_feature_compat &
1512 EXT2_FEATURE_COMPAT_RESIZE_INODE))
1513 return 0;
1514
1515 retval = ext2fs_get_mem(fs->blocksize, &block_buf);
1516 if (retval) goto errout;
1517
1518 retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
1519 if (retval) goto errout;
1520
1521 inode.i_blocks = fs->blocksize/512;
1522
1523 retval = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
1524 if (retval) goto errout;
1525
1526 if (!inode.i_block[EXT2_DIND_BLOCK]) {
1527 /*
1528 * Avoid zeroing out block #0; that's rude. This
1529 * should never happen anyway since the filesystem
1530 * should be fsck'ed and we assume it is consistent.
1531 */
1532 fprintf(stderr,
1533 _("Should never happen: resize inode corrupt!\n"));
1534 exit(1);
1535 }
1536
1537 memset(block_buf, 0, fs->blocksize);
1538
1539 retval = io_channel_write_blk(fs->io, inode.i_block[EXT2_DIND_BLOCK],
1540 1, block_buf);
1541 if (retval) goto errout;
1542
1543 retval = ext2fs_create_resize_inode(fs);
1544 if (retval)
1545 goto errout;
1546
1547 errout:
1548 if (block_buf)
1549 ext2fs_free_mem(&block_buf);
1550 return retval;
1551 }
1552
1553 /*
1554 * Finally, recalculate the summary information
1555 */
1556 static errcode_t ext2fs_calculate_summary_stats(ext2_filsys fs)
1557 {
1558 blk_t blk;
1559 ext2_ino_t ino;
1560 unsigned int group = 0;
1561 unsigned int count = 0;
1562 int total_free = 0;
1563 int group_free = 0;
1564
1565 /*
1566 * First calculate the block statistics
1567 */
1568 for (blk = fs->super->s_first_data_block;
1569 blk < fs->super->s_blocks_count; blk++) {
1570 if (!ext2fs_fast_test_block_bitmap(fs->block_map, blk)) {
1571 group_free++;
1572 total_free++;
1573 }
1574 count++;
1575 if ((count == fs->super->s_blocks_per_group) ||
1576 (blk == fs->super->s_blocks_count-1)) {
1577 fs->group_desc[group++].bg_free_blocks_count =
1578 group_free;
1579 count = 0;
1580 group_free = 0;
1581 }
1582 }
1583 fs->super->s_free_blocks_count = total_free;
1584
1585 /*
1586 * Next, calculate the inode statistics
1587 */
1588 group_free = 0;
1589 total_free = 0;
1590 count = 0;
1591 group = 0;
1592
1593 /* Protect loop from wrap-around if s_inodes_count maxed */
1594 for (ino = 1; ino <= fs->super->s_inodes_count && ino > 0; ino++) {
1595 if (!ext2fs_fast_test_inode_bitmap(fs->inode_map, ino)) {
1596 group_free++;
1597 total_free++;
1598 }
1599 count++;
1600 if ((count == fs->super->s_inodes_per_group) ||
1601 (ino == fs->super->s_inodes_count)) {
1602 fs->group_desc[group++].bg_free_inodes_count =
1603 group_free;
1604 count = 0;
1605 group_free = 0;
1606 }
1607 }
1608 fs->super->s_free_inodes_count = total_free;
1609 ext2fs_mark_super_dirty(fs);
1610 return 0;
1611 }
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