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12
13#define EXT4FS_DEBUG
14
15#include <linux/errno.h>
16#include <linux/slab.h>
17
18#include "ext4_jbd2.h"
19
20int ext4_resize_begin(struct super_block *sb)
21{
22 int ret = 0;
23
24 if (!capable(CAP_SYS_RESOURCE))
25 return -EPERM;
26
27
28
29
30
31
32 if (EXT4_SB(sb)->s_sbh->b_blocknr !=
33 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
34 ext4_warning(sb, "won't resize using backup superblock at %llu",
35 (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);
36 return -EPERM;
37 }
38
39
40
41
42
43 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
44 ext4_warning(sb, "There are errors in the filesystem, "
45 "so online resizing is not allowed");
46 return -EPERM;
47 }
48
49 if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
50 &EXT4_SB(sb)->s_ext4_flags))
51 ret = -EBUSY;
52
53 return ret;
54}
55
56void ext4_resize_end(struct super_block *sb)
57{
58 clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags);
59 smp_mb__after_atomic();
60}
61
62static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
63 ext4_group_t group) {
64 return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) <<
65 EXT4_DESC_PER_BLOCK_BITS(sb);
66}
67
68static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
69 ext4_group_t group) {
70 group = ext4_meta_bg_first_group(sb, group);
71 return ext4_group_first_block_no(sb, group);
72}
73
74static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
75 ext4_group_t group) {
76 ext4_grpblk_t overhead;
77 overhead = ext4_bg_num_gdb(sb, group);
78 if (ext4_bg_has_super(sb, group))
79 overhead += 1 +
80 le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
81 return overhead;
82}
83
84#define outside(b, first, last) ((b) < (first) || (b) >= (last))
85#define inside(b, first, last) ((b) >= (first) && (b) < (last))
86
87static int verify_group_input(struct super_block *sb,
88 struct ext4_new_group_data *input)
89{
90 struct ext4_sb_info *sbi = EXT4_SB(sb);
91 struct ext4_super_block *es = sbi->s_es;
92 ext4_fsblk_t start = ext4_blocks_count(es);
93 ext4_fsblk_t end = start + input->blocks_count;
94 ext4_group_t group = input->group;
95 ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
96 unsigned overhead;
97 ext4_fsblk_t metaend;
98 struct buffer_head *bh = NULL;
99 ext4_grpblk_t free_blocks_count, offset;
100 int err = -EINVAL;
101
102 if (group != sbi->s_groups_count) {
103 ext4_warning(sb, "Cannot add at group %u (only %u groups)",
104 input->group, sbi->s_groups_count);
105 return -EINVAL;
106 }
107
108 overhead = ext4_group_overhead_blocks(sb, group);
109 metaend = start + overhead;
110 input->free_blocks_count = free_blocks_count =
111 input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
112
113 if (test_opt(sb, DEBUG))
114 printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks "
115 "(%d free, %u reserved)\n",
116 ext4_bg_has_super(sb, input->group) ? "normal" :
117 "no-super", input->group, input->blocks_count,
118 free_blocks_count, input->reserved_blocks);
119
120 ext4_get_group_no_and_offset(sb, start, NULL, &offset);
121 if (offset != 0)
122 ext4_warning(sb, "Last group not full");
123 else if (input->reserved_blocks > input->blocks_count / 5)
124 ext4_warning(sb, "Reserved blocks too high (%u)",
125 input->reserved_blocks);
126 else if (free_blocks_count < 0)
127 ext4_warning(sb, "Bad blocks count %u",
128 input->blocks_count);
129 else if (!(bh = sb_bread(sb, end - 1)))
130 ext4_warning(sb, "Cannot read last block (%llu)",
131 end - 1);
132 else if (outside(input->block_bitmap, start, end))
133 ext4_warning(sb, "Block bitmap not in group (block %llu)",
134 (unsigned long long)input->block_bitmap);
135 else if (outside(input->inode_bitmap, start, end))
136 ext4_warning(sb, "Inode bitmap not in group (block %llu)",
137 (unsigned long long)input->inode_bitmap);
138 else if (outside(input->inode_table, start, end) ||
139 outside(itend - 1, start, end))
140 ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)",
141 (unsigned long long)input->inode_table, itend - 1);
142 else if (input->inode_bitmap == input->block_bitmap)
143 ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)",
144 (unsigned long long)input->block_bitmap);
145 else if (inside(input->block_bitmap, input->inode_table, itend))
146 ext4_warning(sb, "Block bitmap (%llu) in inode table "
147 "(%llu-%llu)",
148 (unsigned long long)input->block_bitmap,
149 (unsigned long long)input->inode_table, itend - 1);
150 else if (inside(input->inode_bitmap, input->inode_table, itend))
151 ext4_warning(sb, "Inode bitmap (%llu) in inode table "
152 "(%llu-%llu)",
153 (unsigned long long)input->inode_bitmap,
154 (unsigned long long)input->inode_table, itend - 1);
155 else if (inside(input->block_bitmap, start, metaend))
156 ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)",
157 (unsigned long long)input->block_bitmap,
158 start, metaend - 1);
159 else if (inside(input->inode_bitmap, start, metaend))
160 ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)",
161 (unsigned long long)input->inode_bitmap,
162 start, metaend - 1);
163 else if (inside(input->inode_table, start, metaend) ||
164 inside(itend - 1, start, metaend))
165 ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table "
166 "(%llu-%llu)",
167 (unsigned long long)input->inode_table,
168 itend - 1, start, metaend - 1);
169 else
170 err = 0;
171 brelse(bh);
172
173 return err;
174}
175
176
177
178
179
180struct ext4_new_flex_group_data {
181 struct ext4_new_group_data *groups;
182
183 __u16 *bg_flags;
184
185 ext4_group_t count;
186
187};
188
189
190
191
192
193
194
195static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
196{
197 struct ext4_new_flex_group_data *flex_gd;
198
199 flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
200 if (flex_gd == NULL)
201 goto out3;
202
203 if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
204 goto out2;
205 flex_gd->count = flexbg_size;
206
207 flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) *
208 flexbg_size, GFP_NOFS);
209 if (flex_gd->groups == NULL)
210 goto out2;
211
212 flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS);
213 if (flex_gd->bg_flags == NULL)
214 goto out1;
215
216 return flex_gd;
217
218out1:
219 kfree(flex_gd->groups);
220out2:
221 kfree(flex_gd);
222out3:
223 return NULL;
224}
225
226static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
227{
228 kfree(flex_gd->bg_flags);
229 kfree(flex_gd->groups);
230 kfree(flex_gd);
231}
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246static int ext4_alloc_group_tables(struct super_block *sb,
247 struct ext4_new_flex_group_data *flex_gd,
248 int flexbg_size)
249{
250 struct ext4_new_group_data *group_data = flex_gd->groups;
251 ext4_fsblk_t start_blk;
252 ext4_fsblk_t last_blk;
253 ext4_group_t src_group;
254 ext4_group_t bb_index = 0;
255 ext4_group_t ib_index = 0;
256 ext4_group_t it_index = 0;
257 ext4_group_t group;
258 ext4_group_t last_group;
259 unsigned overhead;
260 __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
261
262 BUG_ON(flex_gd->count == 0 || group_data == NULL);
263
264 src_group = group_data[0].group;
265 last_group = src_group + flex_gd->count - 1;
266
267 BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
268 (last_group & ~(flexbg_size - 1))));
269next_group:
270 group = group_data[0].group;
271 if (src_group >= group_data[0].group + flex_gd->count)
272 return -ENOSPC;
273 start_blk = ext4_group_first_block_no(sb, src_group);
274 last_blk = start_blk + group_data[src_group - group].blocks_count;
275
276 overhead = ext4_group_overhead_blocks(sb, src_group);
277
278 start_blk += overhead;
279
280
281 src_group++;
282 for (; src_group <= last_group; src_group++) {
283 overhead = ext4_group_overhead_blocks(sb, src_group);
284 if (overhead == 0)
285 last_blk += group_data[src_group - group].blocks_count;
286 else
287 break;
288 }
289
290
291 for (; bb_index < flex_gd->count; bb_index++) {
292 if (start_blk >= last_blk)
293 goto next_group;
294 group_data[bb_index].block_bitmap = start_blk++;
295 group = ext4_get_group_number(sb, start_blk - 1);
296 group -= group_data[0].group;
297 group_data[group].free_blocks_count--;
298 flex_gd->bg_flags[group] &= uninit_mask;
299 }
300
301
302 for (; ib_index < flex_gd->count; ib_index++) {
303 if (start_blk >= last_blk)
304 goto next_group;
305 group_data[ib_index].inode_bitmap = start_blk++;
306 group = ext4_get_group_number(sb, start_blk - 1);
307 group -= group_data[0].group;
308 group_data[group].free_blocks_count--;
309 flex_gd->bg_flags[group] &= uninit_mask;
310 }
311
312
313 for (; it_index < flex_gd->count; it_index++) {
314 unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
315 ext4_fsblk_t next_group_start;
316
317 if (start_blk + itb > last_blk)
318 goto next_group;
319 group_data[it_index].inode_table = start_blk;
320 group = ext4_get_group_number(sb, start_blk);
321 next_group_start = ext4_group_first_block_no(sb, group + 1);
322 group -= group_data[0].group;
323
324 if (start_blk + itb > next_group_start) {
325 flex_gd->bg_flags[group + 1] &= uninit_mask;
326 overhead = start_blk + itb - next_group_start;
327 group_data[group + 1].free_blocks_count -= overhead;
328 itb -= overhead;
329 }
330
331 group_data[group].free_blocks_count -= itb;
332 flex_gd->bg_flags[group] &= uninit_mask;
333 start_blk += EXT4_SB(sb)->s_itb_per_group;
334 }
335
336 if (test_opt(sb, DEBUG)) {
337 int i;
338 group = group_data[0].group;
339
340 printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
341 "%d groups, flexbg size is %d:\n", flex_gd->count,
342 flexbg_size);
343
344 for (i = 0; i < flex_gd->count; i++) {
345 printk(KERN_DEBUG "adding %s group %u: %u "
346 "blocks (%d free)\n",
347 ext4_bg_has_super(sb, group + i) ? "normal" :
348 "no-super", group + i,
349 group_data[i].blocks_count,
350 group_data[i].free_blocks_count);
351 }
352 }
353 return 0;
354}
355
356static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
357 ext4_fsblk_t blk)
358{
359 struct buffer_head *bh;
360 int err;
361
362 bh = sb_getblk(sb, blk);
363 if (unlikely(!bh))
364 return ERR_PTR(-ENOMEM);
365 BUFFER_TRACE(bh, "get_write_access");
366 if ((err = ext4_journal_get_write_access(handle, bh))) {
367 brelse(bh);
368 bh = ERR_PTR(err);
369 } else {
370 memset(bh->b_data, 0, sb->s_blocksize);
371 set_buffer_uptodate(bh);
372 }
373
374 return bh;
375}
376
377
378
379
380
381
382static int extend_or_restart_transaction(handle_t *handle, int thresh)
383{
384 int err;
385
386 if (ext4_handle_has_enough_credits(handle, thresh))
387 return 0;
388
389 err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA);
390 if (err < 0)
391 return err;
392 if (err) {
393 err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA);
394 if (err)
395 return err;
396 }
397
398 return 0;
399}
400
401
402
403
404
405
406
407
408
409
410static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
411 struct ext4_new_flex_group_data *flex_gd,
412 ext4_fsblk_t block, ext4_group_t count)
413{
414 ext4_group_t count2;
415
416 ext4_debug("mark blocks [%llu/%u] used\n", block, count);
417 for (count2 = count; count > 0; count -= count2, block += count2) {
418 ext4_fsblk_t start;
419 struct buffer_head *bh;
420 ext4_group_t group;
421 int err;
422
423 group = ext4_get_group_number(sb, block);
424 start = ext4_group_first_block_no(sb, group);
425 group -= flex_gd->groups[0].group;
426
427 count2 = EXT4_BLOCKS_PER_GROUP(sb) - (block - start);
428 if (count2 > count)
429 count2 = count;
430
431 if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
432 BUG_ON(flex_gd->count > 1);
433 continue;
434 }
435
436 err = extend_or_restart_transaction(handle, 1);
437 if (err)
438 return err;
439
440 bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
441 if (unlikely(!bh))
442 return -ENOMEM;
443
444 BUFFER_TRACE(bh, "get_write_access");
445 err = ext4_journal_get_write_access(handle, bh);
446 if (err)
447 return err;
448 ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block,
449 block - start, count2);
450 ext4_set_bits(bh->b_data, block - start, count2);
451
452 err = ext4_handle_dirty_metadata(handle, NULL, bh);
453 if (unlikely(err))
454 return err;
455 brelse(bh);
456 }
457
458 return 0;
459}
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475static int setup_new_flex_group_blocks(struct super_block *sb,
476 struct ext4_new_flex_group_data *flex_gd)
477{
478 int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
479 ext4_fsblk_t start;
480 ext4_fsblk_t block;
481 struct ext4_sb_info *sbi = EXT4_SB(sb);
482 struct ext4_super_block *es = sbi->s_es;
483 struct ext4_new_group_data *group_data = flex_gd->groups;
484 __u16 *bg_flags = flex_gd->bg_flags;
485 handle_t *handle;
486 ext4_group_t group, count;
487 struct buffer_head *bh = NULL;
488 int reserved_gdb, i, j, err = 0, err2;
489 int meta_bg;
490
491 BUG_ON(!flex_gd->count || !group_data ||
492 group_data[0].group != sbi->s_groups_count);
493
494 reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
495 meta_bg = ext4_has_feature_meta_bg(sb);
496
497
498 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
499 if (IS_ERR(handle))
500 return PTR_ERR(handle);
501
502 group = group_data[0].group;
503 for (i = 0; i < flex_gd->count; i++, group++) {
504 unsigned long gdblocks;
505 ext4_grpblk_t overhead;
506
507 gdblocks = ext4_bg_num_gdb(sb, group);
508 start = ext4_group_first_block_no(sb, group);
509
510 if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
511 goto handle_itb;
512
513 if (meta_bg == 1) {
514 ext4_group_t first_group;
515 first_group = ext4_meta_bg_first_group(sb, group);
516 if (first_group != group + 1 &&
517 first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
518 goto handle_itb;
519 }
520
521 block = start + ext4_bg_has_super(sb, group);
522
523 for (j = 0; j < gdblocks; j++, block++) {
524 struct buffer_head *gdb;
525
526 ext4_debug("update backup group %#04llx\n", block);
527 err = extend_or_restart_transaction(handle, 1);
528 if (err)
529 goto out;
530
531 gdb = sb_getblk(sb, block);
532 if (unlikely(!gdb)) {
533 err = -ENOMEM;
534 goto out;
535 }
536
537 BUFFER_TRACE(gdb, "get_write_access");
538 err = ext4_journal_get_write_access(handle, gdb);
539 if (err) {
540 brelse(gdb);
541 goto out;
542 }
543 memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data,
544 gdb->b_size);
545 set_buffer_uptodate(gdb);
546
547 err = ext4_handle_dirty_metadata(handle, NULL, gdb);
548 if (unlikely(err)) {
549 brelse(gdb);
550 goto out;
551 }
552 brelse(gdb);
553 }
554
555
556
557
558 if (ext4_bg_has_super(sb, group)) {
559 err = sb_issue_zeroout(sb, gdblocks + start + 1,
560 reserved_gdb, GFP_NOFS);
561 if (err)
562 goto out;
563 }
564
565handle_itb:
566
567 if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
568 goto handle_bb;
569
570
571 block = group_data[i].inode_table;
572 ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
573 block, sbi->s_itb_per_group);
574 err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
575 GFP_NOFS);
576 if (err)
577 goto out;
578
579handle_bb:
580 if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
581 goto handle_ib;
582
583
584 block = group_data[i].block_bitmap;
585 err = extend_or_restart_transaction(handle, 1);
586 if (err)
587 goto out;
588
589 bh = bclean(handle, sb, block);
590 if (IS_ERR(bh)) {
591 err = PTR_ERR(bh);
592 bh = NULL;
593 goto out;
594 }
595 overhead = ext4_group_overhead_blocks(sb, group);
596 if (overhead != 0) {
597 ext4_debug("mark backup superblock %#04llx (+0)\n",
598 start);
599 ext4_set_bits(bh->b_data, 0, overhead);
600 }
601 ext4_mark_bitmap_end(group_data[i].blocks_count,
602 sb->s_blocksize * 8, bh->b_data);
603 err = ext4_handle_dirty_metadata(handle, NULL, bh);
604 if (err)
605 goto out;
606 brelse(bh);
607
608handle_ib:
609 if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
610 continue;
611
612
613 block = group_data[i].inode_bitmap;
614 err = extend_or_restart_transaction(handle, 1);
615 if (err)
616 goto out;
617
618 bh = bclean(handle, sb, block);
619 if (IS_ERR(bh)) {
620 err = PTR_ERR(bh);
621 bh = NULL;
622 goto out;
623 }
624
625 ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
626 sb->s_blocksize * 8, bh->b_data);
627 err = ext4_handle_dirty_metadata(handle, NULL, bh);
628 if (err)
629 goto out;
630 brelse(bh);
631 }
632 bh = NULL;
633
634
635 for (j = 0; j < GROUP_TABLE_COUNT; j++) {
636 count = group_table_count[j];
637 start = (&group_data[0].block_bitmap)[j];
638 block = start;
639 for (i = 1; i < flex_gd->count; i++) {
640 block += group_table_count[j];
641 if (block == (&group_data[i].block_bitmap)[j]) {
642 count += group_table_count[j];
643 continue;
644 }
645 err = set_flexbg_block_bitmap(sb, handle,
646 flex_gd, start, count);
647 if (err)
648 goto out;
649 count = group_table_count[j];
650 start = (&group_data[i].block_bitmap)[j];
651 block = start;
652 }
653
654 if (count) {
655 err = set_flexbg_block_bitmap(sb, handle,
656 flex_gd, start, count);
657 if (err)
658 goto out;
659 }
660 }
661
662out:
663 brelse(bh);
664 err2 = ext4_journal_stop(handle);
665 if (err2 && !err)
666 err = err2;
667
668 return err;
669}
670
671
672
673
674
675
676
677
678static unsigned ext4_list_backups(struct super_block *sb, unsigned *three,
679 unsigned *five, unsigned *seven)
680{
681 unsigned *min = three;
682 int mult = 3;
683 unsigned ret;
684
685 if (!ext4_has_feature_sparse_super(sb)) {
686 ret = *min;
687 *min += 1;
688 return ret;
689 }
690
691 if (*five < *min) {
692 min = five;
693 mult = 5;
694 }
695 if (*seven < *min) {
696 min = seven;
697 mult = 7;
698 }
699
700 ret = *min;
701 *min *= mult;
702
703 return ret;
704}
705
706
707
708
709
710
711static int verify_reserved_gdb(struct super_block *sb,
712 ext4_group_t end,
713 struct buffer_head *primary)
714{
715 const ext4_fsblk_t blk = primary->b_blocknr;
716 unsigned three = 1;
717 unsigned five = 5;
718 unsigned seven = 7;
719 unsigned grp;
720 __le32 *p = (__le32 *)primary->b_data;
721 int gdbackups = 0;
722
723 while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) {
724 if (le32_to_cpu(*p++) !=
725 grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){
726 ext4_warning(sb, "reserved GDT %llu"
727 " missing grp %d (%llu)",
728 blk, grp,
729 grp *
730 (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
731 blk);
732 return -EINVAL;
733 }
734 if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb))
735 return -EFBIG;
736 }
737
738 return gdbackups;
739}
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754static int add_new_gdb(handle_t *handle, struct inode *inode,
755 ext4_group_t group)
756{
757 struct super_block *sb = inode->i_sb;
758 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
759 unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
760 ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
761 struct buffer_head **o_group_desc, **n_group_desc;
762 struct buffer_head *dind;
763 struct buffer_head *gdb_bh;
764 int gdbackups;
765 struct ext4_iloc iloc;
766 __le32 *data;
767 int err;
768
769 if (test_opt(sb, DEBUG))
770 printk(KERN_DEBUG
771 "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n",
772 gdb_num);
773
774 gdb_bh = sb_bread(sb, gdblock);
775 if (!gdb_bh)
776 return -EIO;
777
778 gdbackups = verify_reserved_gdb(sb, group, gdb_bh);
779 if (gdbackups < 0) {
780 err = gdbackups;
781 goto exit_bh;
782 }
783
784 data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
785 dind = sb_bread(sb, le32_to_cpu(*data));
786 if (!dind) {
787 err = -EIO;
788 goto exit_bh;
789 }
790
791 data = (__le32 *)dind->b_data;
792 if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) {
793 ext4_warning(sb, "new group %u GDT block %llu not reserved",
794 group, gdblock);
795 err = -EINVAL;
796 goto exit_dind;
797 }
798
799 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
800 err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
801 if (unlikely(err))
802 goto exit_dind;
803
804 BUFFER_TRACE(gdb_bh, "get_write_access");
805 err = ext4_journal_get_write_access(handle, gdb_bh);
806 if (unlikely(err))
807 goto exit_dind;
808
809 BUFFER_TRACE(dind, "get_write_access");
810 err = ext4_journal_get_write_access(handle, dind);
811 if (unlikely(err))
812 ext4_std_error(sb, err);
813
814
815 err = ext4_reserve_inode_write(handle, inode, &iloc);
816 if (unlikely(err))
817 goto exit_dind;
818
819 n_group_desc = ext4_kvmalloc((gdb_num + 1) *
820 sizeof(struct buffer_head *),
821 GFP_NOFS);
822 if (!n_group_desc) {
823 err = -ENOMEM;
824 ext4_warning(sb, "not enough memory for %lu groups",
825 gdb_num + 1);
826 goto exit_inode;
827 }
828
829
830
831
832
833
834
835
836
837
838 data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0;
839 err = ext4_handle_dirty_metadata(handle, NULL, dind);
840 if (unlikely(err)) {
841 ext4_std_error(sb, err);
842 goto exit_inode;
843 }
844 inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9;
845 ext4_mark_iloc_dirty(handle, inode, &iloc);
846 memset(gdb_bh->b_data, 0, sb->s_blocksize);
847 err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
848 if (unlikely(err)) {
849 ext4_std_error(sb, err);
850 goto exit_inode;
851 }
852 brelse(dind);
853
854 o_group_desc = EXT4_SB(sb)->s_group_desc;
855 memcpy(n_group_desc, o_group_desc,
856 EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
857 n_group_desc[gdb_num] = gdb_bh;
858 EXT4_SB(sb)->s_group_desc = n_group_desc;
859 EXT4_SB(sb)->s_gdb_count++;
860 kvfree(o_group_desc);
861
862 le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
863 err = ext4_handle_dirty_super(handle, sb);
864 if (err)
865 ext4_std_error(sb, err);
866
867 return err;
868
869exit_inode:
870 kvfree(n_group_desc);
871 brelse(iloc.bh);
872exit_dind:
873 brelse(dind);
874exit_bh:
875 brelse(gdb_bh);
876
877 ext4_debug("leaving with error %d\n", err);
878 return err;
879}
880
881
882
883
884static int add_new_gdb_meta_bg(struct super_block *sb,
885 handle_t *handle, ext4_group_t group) {
886 ext4_fsblk_t gdblock;
887 struct buffer_head *gdb_bh;
888 struct buffer_head **o_group_desc, **n_group_desc;
889 unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
890 int err;
891
892 gdblock = ext4_meta_bg_first_block_no(sb, group) +
893 ext4_bg_has_super(sb, group);
894 gdb_bh = sb_bread(sb, gdblock);
895 if (!gdb_bh)
896 return -EIO;
897 n_group_desc = ext4_kvmalloc((gdb_num + 1) *
898 sizeof(struct buffer_head *),
899 GFP_NOFS);
900 if (!n_group_desc) {
901 err = -ENOMEM;
902 ext4_warning(sb, "not enough memory for %lu groups",
903 gdb_num + 1);
904 return err;
905 }
906
907 o_group_desc = EXT4_SB(sb)->s_group_desc;
908 memcpy(n_group_desc, o_group_desc,
909 EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
910 n_group_desc[gdb_num] = gdb_bh;
911 EXT4_SB(sb)->s_group_desc = n_group_desc;
912 EXT4_SB(sb)->s_gdb_count++;
913 kvfree(o_group_desc);
914 BUFFER_TRACE(gdb_bh, "get_write_access");
915 err = ext4_journal_get_write_access(handle, gdb_bh);
916 if (unlikely(err))
917 brelse(gdb_bh);
918 return err;
919}
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
935 ext4_group_t group)
936{
937 struct super_block *sb = inode->i_sb;
938 int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
939 struct buffer_head **primary;
940 struct buffer_head *dind;
941 struct ext4_iloc iloc;
942 ext4_fsblk_t blk;
943 __le32 *data, *end;
944 int gdbackups = 0;
945 int res, i;
946 int err;
947
948 primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS);
949 if (!primary)
950 return -ENOMEM;
951
952 data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
953 dind = sb_bread(sb, le32_to_cpu(*data));
954 if (!dind) {
955 err = -EIO;
956 goto exit_free;
957 }
958
959 blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
960 data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
961 EXT4_ADDR_PER_BLOCK(sb));
962 end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
963
964
965 for (res = 0; res < reserved_gdb; res++, blk++) {
966 if (le32_to_cpu(*data) != blk) {
967 ext4_warning(sb, "reserved block %llu"
968 " not at offset %ld",
969 blk,
970 (long)(data - (__le32 *)dind->b_data));
971 err = -EINVAL;
972 goto exit_bh;
973 }
974 primary[res] = sb_bread(sb, blk);
975 if (!primary[res]) {
976 err = -EIO;
977 goto exit_bh;
978 }
979 gdbackups = verify_reserved_gdb(sb, group, primary[res]);
980 if (gdbackups < 0) {
981 brelse(primary[res]);
982 err = gdbackups;
983 goto exit_bh;
984 }
985 if (++data >= end)
986 data = (__le32 *)dind->b_data;
987 }
988
989 for (i = 0; i < reserved_gdb; i++) {
990 BUFFER_TRACE(primary[i], "get_write_access");
991 if ((err = ext4_journal_get_write_access(handle, primary[i])))
992 goto exit_bh;
993 }
994
995 if ((err = ext4_reserve_inode_write(handle, inode, &iloc)))
996 goto exit_bh;
997
998
999
1000
1001
1002 blk = group * EXT4_BLOCKS_PER_GROUP(sb);
1003 for (i = 0; i < reserved_gdb; i++) {
1004 int err2;
1005 data = (__le32 *)primary[i]->b_data;
1006
1007
1008
1009 data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
1010 err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]);
1011 if (!err)
1012 err = err2;
1013 }
1014 inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9;
1015 ext4_mark_iloc_dirty(handle, inode, &iloc);
1016
1017exit_bh:
1018 while (--res >= 0)
1019 brelse(primary[res]);
1020 brelse(dind);
1021
1022exit_free:
1023 kfree(primary);
1024
1025 return err;
1026}
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044static void update_backups(struct super_block *sb, sector_t blk_off, char *data,
1045 int size, int meta_bg)
1046{
1047 struct ext4_sb_info *sbi = EXT4_SB(sb);
1048 ext4_group_t last;
1049 const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
1050 unsigned three = 1;
1051 unsigned five = 5;
1052 unsigned seven = 7;
1053 ext4_group_t group = 0;
1054 int rest = sb->s_blocksize - size;
1055 handle_t *handle;
1056 int err = 0, err2;
1057
1058 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
1059 if (IS_ERR(handle)) {
1060 group = 1;
1061 err = PTR_ERR(handle);
1062 goto exit_err;
1063 }
1064
1065 if (meta_bg == 0) {
1066 group = ext4_list_backups(sb, &three, &five, &seven);
1067 last = sbi->s_groups_count;
1068 } else {
1069 group = ext4_get_group_number(sb, blk_off) + 1;
1070 last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
1071 }
1072
1073 while (group < sbi->s_groups_count) {
1074 struct buffer_head *bh;
1075 ext4_fsblk_t backup_block;
1076
1077
1078 if (ext4_handle_valid(handle) &&
1079 handle->h_buffer_credits == 0 &&
1080 ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) &&
1081 (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA)))
1082 break;
1083
1084 if (meta_bg == 0)
1085 backup_block = ((ext4_fsblk_t)group) * bpg + blk_off;
1086 else
1087 backup_block = (ext4_group_first_block_no(sb, group) +
1088 ext4_bg_has_super(sb, group));
1089
1090 bh = sb_getblk(sb, backup_block);
1091 if (unlikely(!bh)) {
1092 err = -ENOMEM;
1093 break;
1094 }
1095 ext4_debug("update metadata backup %llu(+%llu)\n",
1096 backup_block, backup_block -
1097 ext4_group_first_block_no(sb, group));
1098 BUFFER_TRACE(bh, "get_write_access");
1099 if ((err = ext4_journal_get_write_access(handle, bh)))
1100 break;
1101 lock_buffer(bh);
1102 memcpy(bh->b_data, data, size);
1103 if (rest)
1104 memset(bh->b_data + size, 0, rest);
1105 set_buffer_uptodate(bh);
1106 unlock_buffer(bh);
1107 err = ext4_handle_dirty_metadata(handle, NULL, bh);
1108 if (unlikely(err))
1109 ext4_std_error(sb, err);
1110 brelse(bh);
1111
1112 if (meta_bg == 0)
1113 group = ext4_list_backups(sb, &three, &five, &seven);
1114 else if (group == last)
1115 break;
1116 else
1117 group = last;
1118 }
1119 if ((err2 = ext4_journal_stop(handle)) && !err)
1120 err = err2;
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132exit_err:
1133 if (err) {
1134 ext4_warning(sb, "can't update backup for group %u (err %d), "
1135 "forcing fsck on next reboot", group, err);
1136 sbi->s_mount_state &= ~EXT4_VALID_FS;
1137 sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1138 mark_buffer_dirty(sbi->s_sbh);
1139 }
1140}
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
1153 ext4_group_t group, struct inode *resize_inode,
1154 ext4_group_t count)
1155{
1156 struct ext4_sb_info *sbi = EXT4_SB(sb);
1157 struct ext4_super_block *es = sbi->s_es;
1158 struct buffer_head *gdb_bh;
1159 int i, gdb_off, gdb_num, err = 0;
1160 int meta_bg;
1161
1162 meta_bg = ext4_has_feature_meta_bg(sb);
1163 for (i = 0; i < count; i++, group++) {
1164 int reserved_gdb = ext4_bg_has_super(sb, group) ?
1165 le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1166
1167 gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1168 gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1169
1170
1171
1172
1173
1174
1175
1176 if (gdb_off) {
1177 gdb_bh = sbi->s_group_desc[gdb_num];
1178 BUFFER_TRACE(gdb_bh, "get_write_access");
1179 err = ext4_journal_get_write_access(handle, gdb_bh);
1180
1181 if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
1182 err = reserve_backup_gdb(handle, resize_inode, group);
1183 } else if (meta_bg != 0) {
1184 err = add_new_gdb_meta_bg(sb, handle, group);
1185 } else {
1186 err = add_new_gdb(handle, resize_inode, group);
1187 }
1188 if (err)
1189 break;
1190 }
1191 return err;
1192}
1193
1194static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
1195{
1196 struct buffer_head *bh = sb_getblk(sb, block);
1197 if (unlikely(!bh))
1198 return NULL;
1199 if (!bh_uptodate_or_lock(bh)) {
1200 if (bh_submit_read(bh) < 0) {
1201 brelse(bh);
1202 return NULL;
1203 }
1204 }
1205
1206 return bh;
1207}
1208
1209static int ext4_set_bitmap_checksums(struct super_block *sb,
1210 ext4_group_t group,
1211 struct ext4_group_desc *gdp,
1212 struct ext4_new_group_data *group_data)
1213{
1214 struct buffer_head *bh;
1215
1216 if (!ext4_has_metadata_csum(sb))
1217 return 0;
1218
1219 bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
1220 if (!bh)
1221 return -EIO;
1222 ext4_inode_bitmap_csum_set(sb, group, gdp, bh,
1223 EXT4_INODES_PER_GROUP(sb) / 8);
1224 brelse(bh);
1225
1226 bh = ext4_get_bitmap(sb, group_data->block_bitmap);
1227 if (!bh)
1228 return -EIO;
1229 ext4_block_bitmap_csum_set(sb, group, gdp, bh);
1230 brelse(bh);
1231
1232 return 0;
1233}
1234
1235
1236
1237
1238static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
1239 struct ext4_new_flex_group_data *flex_gd)
1240{
1241 struct ext4_new_group_data *group_data = flex_gd->groups;
1242 struct ext4_group_desc *gdp;
1243 struct ext4_sb_info *sbi = EXT4_SB(sb);
1244 struct buffer_head *gdb_bh;
1245 ext4_group_t group;
1246 __u16 *bg_flags = flex_gd->bg_flags;
1247 int i, gdb_off, gdb_num, err = 0;
1248
1249
1250 for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
1251 group = group_data->group;
1252
1253 gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1254 gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1255
1256
1257
1258
1259 gdb_bh = sbi->s_group_desc[gdb_num];
1260
1261 gdp = (struct ext4_group_desc *)(gdb_bh->b_data +
1262 gdb_off * EXT4_DESC_SIZE(sb));
1263
1264 memset(gdp, 0, EXT4_DESC_SIZE(sb));
1265 ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
1266 ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
1267 err = ext4_set_bitmap_checksums(sb, group, gdp, group_data);
1268 if (err) {
1269 ext4_std_error(sb, err);
1270 break;
1271 }
1272
1273 ext4_inode_table_set(sb, gdp, group_data->inode_table);
1274 ext4_free_group_clusters_set(sb, gdp,
1275 EXT4_NUM_B2C(sbi, group_data->free_blocks_count));
1276 ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
1277 if (ext4_has_group_desc_csum(sb))
1278 ext4_itable_unused_set(sb, gdp,
1279 EXT4_INODES_PER_GROUP(sb));
1280 gdp->bg_flags = cpu_to_le16(*bg_flags);
1281 ext4_group_desc_csum_set(sb, group, gdp);
1282
1283 err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
1284 if (unlikely(err)) {
1285 ext4_std_error(sb, err);
1286 break;
1287 }
1288
1289
1290
1291
1292
1293 err = ext4_mb_add_groupinfo(sb, group, gdp);
1294 if (err)
1295 break;
1296 }
1297 return err;
1298}
1299
1300
1301
1302
1303
1304
1305
1306
1307static void ext4_update_super(struct super_block *sb,
1308 struct ext4_new_flex_group_data *flex_gd)
1309{
1310 ext4_fsblk_t blocks_count = 0;
1311 ext4_fsblk_t free_blocks = 0;
1312 ext4_fsblk_t reserved_blocks = 0;
1313 struct ext4_new_group_data *group_data = flex_gd->groups;
1314 struct ext4_sb_info *sbi = EXT4_SB(sb);
1315 struct ext4_super_block *es = sbi->s_es;
1316 int i;
1317
1318 BUG_ON(flex_gd->count == 0 || group_data == NULL);
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329 for (i = 0; i < flex_gd->count; i++) {
1330 blocks_count += group_data[i].blocks_count;
1331 free_blocks += group_data[i].free_blocks_count;
1332 }
1333
1334 reserved_blocks = ext4_r_blocks_count(es) * 100;
1335 reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
1336 reserved_blocks *= blocks_count;
1337 do_div(reserved_blocks, 100);
1338
1339 ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
1340 ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
1341 le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1342 flex_gd->count);
1343 le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1344 flex_gd->count);
1345
1346 ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365 smp_wmb();
1366
1367
1368 sbi->s_groups_count += flex_gd->count;
1369 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
1370 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
1371
1372
1373
1374 ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
1375 reserved_blocks);
1376
1377
1378 percpu_counter_add(&sbi->s_freeclusters_counter,
1379 EXT4_NUM_B2C(sbi, free_blocks));
1380 percpu_counter_add(&sbi->s_freeinodes_counter,
1381 EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
1382
1383 ext4_debug("free blocks count %llu",
1384 percpu_counter_read(&sbi->s_freeclusters_counter));
1385 if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) {
1386 ext4_group_t flex_group;
1387 flex_group = ext4_flex_group(sbi, group_data[0].group);
1388 atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
1389 &sbi->s_flex_groups[flex_group].free_clusters);
1390 atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
1391 &sbi->s_flex_groups[flex_group].free_inodes);
1392 }
1393
1394
1395
1396
1397 ext4_calculate_overhead(sb);
1398
1399 if (test_opt(sb, DEBUG))
1400 printk(KERN_DEBUG "EXT4-fs: added group %u:"
1401 "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
1402 blocks_count, free_blocks, reserved_blocks);
1403}
1404
1405
1406
1407
1408
1409static int ext4_flex_group_add(struct super_block *sb,
1410 struct inode *resize_inode,
1411 struct ext4_new_flex_group_data *flex_gd)
1412{
1413 struct ext4_sb_info *sbi = EXT4_SB(sb);
1414 struct ext4_super_block *es = sbi->s_es;
1415 ext4_fsblk_t o_blocks_count;
1416 ext4_grpblk_t last;
1417 ext4_group_t group;
1418 handle_t *handle;
1419 unsigned reserved_gdb;
1420 int err = 0, err2 = 0, credit;
1421
1422 BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags);
1423
1424 reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
1425 o_blocks_count = ext4_blocks_count(es);
1426 ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1427 BUG_ON(last);
1428
1429 err = setup_new_flex_group_blocks(sb, flex_gd);
1430 if (err)
1431 goto exit;
1432
1433
1434
1435
1436
1437
1438
1439 credit = 3;
1440
1441 credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb));
1442 credit += reserved_gdb;
1443 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit);
1444 if (IS_ERR(handle)) {
1445 err = PTR_ERR(handle);
1446 goto exit;
1447 }
1448
1449 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1450 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1451 if (err)
1452 goto exit_journal;
1453
1454 group = flex_gd->groups[0].group;
1455 BUG_ON(group != EXT4_SB(sb)->s_groups_count);
1456 err = ext4_add_new_descs(handle, sb, group,
1457 resize_inode, flex_gd->count);
1458 if (err)
1459 goto exit_journal;
1460
1461 err = ext4_setup_new_descs(handle, sb, flex_gd);
1462 if (err)
1463 goto exit_journal;
1464
1465 ext4_update_super(sb, flex_gd);
1466
1467 err = ext4_handle_dirty_super(handle, sb);
1468
1469exit_journal:
1470 err2 = ext4_journal_stop(handle);
1471 if (!err)
1472 err = err2;
1473
1474 if (!err) {
1475 int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1476 int gdb_num_end = ((group + flex_gd->count - 1) /
1477 EXT4_DESC_PER_BLOCK(sb));
1478 int meta_bg = ext4_has_feature_meta_bg(sb);
1479 sector_t old_gdb = 0;
1480
1481 update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
1482 sizeof(struct ext4_super_block), 0);
1483 for (; gdb_num <= gdb_num_end; gdb_num++) {
1484 struct buffer_head *gdb_bh;
1485
1486 gdb_bh = sbi->s_group_desc[gdb_num];
1487 if (old_gdb == gdb_bh->b_blocknr)
1488 continue;
1489 update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
1490 gdb_bh->b_size, meta_bg);
1491 old_gdb = gdb_bh->b_blocknr;
1492 }
1493 }
1494exit:
1495 return err;
1496}
1497
1498static int ext4_setup_next_flex_gd(struct super_block *sb,
1499 struct ext4_new_flex_group_data *flex_gd,
1500 ext4_fsblk_t n_blocks_count,
1501 unsigned long flexbg_size)
1502{
1503 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1504 struct ext4_new_group_data *group_data = flex_gd->groups;
1505 ext4_fsblk_t o_blocks_count;
1506 ext4_group_t n_group;
1507 ext4_group_t group;
1508 ext4_group_t last_group;
1509 ext4_grpblk_t last;
1510 ext4_grpblk_t blocks_per_group;
1511 unsigned long i;
1512
1513 blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb);
1514
1515 o_blocks_count = ext4_blocks_count(es);
1516
1517 if (o_blocks_count == n_blocks_count)
1518 return 0;
1519
1520 ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1521 BUG_ON(last);
1522 ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);
1523
1524 last_group = group | (flexbg_size - 1);
1525 if (last_group > n_group)
1526 last_group = n_group;
1527
1528 flex_gd->count = last_group - group + 1;
1529
1530 for (i = 0; i < flex_gd->count; i++) {
1531 int overhead;
1532
1533 group_data[i].group = group + i;
1534 group_data[i].blocks_count = blocks_per_group;
1535 overhead = ext4_group_overhead_blocks(sb, group + i);
1536 group_data[i].free_blocks_count = blocks_per_group - overhead;
1537 if (ext4_has_group_desc_csum(sb)) {
1538 flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
1539 EXT4_BG_INODE_UNINIT;
1540 if (!test_opt(sb, INIT_INODE_TABLE))
1541 flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED;
1542 } else
1543 flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED;
1544 }
1545
1546 if (last_group == n_group && ext4_has_group_desc_csum(sb))
1547
1548 flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT;
1549
1550 if ((last_group == n_group) && (last != blocks_per_group - 1)) {
1551 group_data[i - 1].blocks_count = last + 1;
1552 group_data[i - 1].free_blocks_count -= blocks_per_group-
1553 last - 1;
1554 }
1555
1556 return 1;
1557}
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
1573{
1574 struct ext4_new_flex_group_data flex_gd;
1575 struct ext4_sb_info *sbi = EXT4_SB(sb);
1576 struct ext4_super_block *es = sbi->s_es;
1577 int reserved_gdb = ext4_bg_has_super(sb, input->group) ?
1578 le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1579 struct inode *inode = NULL;
1580 int gdb_off;
1581 int err;
1582 __u16 bg_flags = 0;
1583
1584 gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb);
1585
1586 if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) {
1587 ext4_warning(sb, "Can't resize non-sparse filesystem further");
1588 return -EPERM;
1589 }
1590
1591 if (ext4_blocks_count(es) + input->blocks_count <
1592 ext4_blocks_count(es)) {
1593 ext4_warning(sb, "blocks_count overflow");
1594 return -EINVAL;
1595 }
1596
1597 if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) <
1598 le32_to_cpu(es->s_inodes_count)) {
1599 ext4_warning(sb, "inodes_count overflow");
1600 return -EINVAL;
1601 }
1602
1603 if (reserved_gdb || gdb_off == 0) {
1604 if (ext4_has_feature_resize_inode(sb) ||
1605 !le16_to_cpu(es->s_reserved_gdt_blocks)) {
1606 ext4_warning(sb,
1607 "No reserved GDT blocks, can't resize");
1608 return -EPERM;
1609 }
1610 inode = ext4_iget(sb, EXT4_RESIZE_INO);
1611 if (IS_ERR(inode)) {
1612 ext4_warning(sb, "Error opening resize inode");
1613 return PTR_ERR(inode);
1614 }
1615 }
1616
1617
1618 err = verify_group_input(sb, input);
1619 if (err)
1620 goto out;
1621
1622 err = ext4_alloc_flex_bg_array(sb, input->group + 1);
1623 if (err)
1624 goto out;
1625
1626 err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
1627 if (err)
1628 goto out;
1629
1630 flex_gd.count = 1;
1631 flex_gd.groups = input;
1632 flex_gd.bg_flags = &bg_flags;
1633 err = ext4_flex_group_add(sb, inode, &flex_gd);
1634out:
1635 iput(inode);
1636 return err;
1637}
1638
1639
1640
1641
1642static int ext4_group_extend_no_check(struct super_block *sb,
1643 ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
1644{
1645 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1646 handle_t *handle;
1647 int err = 0, err2;
1648
1649
1650
1651
1652 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3);
1653 if (IS_ERR(handle)) {
1654 err = PTR_ERR(handle);
1655 ext4_warning(sb, "error %d on journal start", err);
1656 return err;
1657 }
1658
1659 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
1660 err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
1661 if (err) {
1662 ext4_warning(sb, "error %d on journal write access", err);
1663 goto errout;
1664 }
1665
1666 ext4_blocks_count_set(es, o_blocks_count + add);
1667 ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);
1668 ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
1669 o_blocks_count + add);
1670
1671 err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
1672 if (err)
1673 goto errout;
1674 ext4_handle_dirty_super(handle, sb);
1675 ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
1676 o_blocks_count + add);
1677errout:
1678 err2 = ext4_journal_stop(handle);
1679 if (err2 && !err)
1680 err = err2;
1681
1682 if (!err) {
1683 if (test_opt(sb, DEBUG))
1684 printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
1685 "blocks\n", ext4_blocks_count(es));
1686 update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr,
1687 (char *)es, sizeof(struct ext4_super_block), 0);
1688 }
1689 return err;
1690}
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1703 ext4_fsblk_t n_blocks_count)
1704{
1705 ext4_fsblk_t o_blocks_count;
1706 ext4_grpblk_t last;
1707 ext4_grpblk_t add;
1708 struct buffer_head *bh;
1709 int err;
1710 ext4_group_t group;
1711
1712 o_blocks_count = ext4_blocks_count(es);
1713
1714 if (test_opt(sb, DEBUG))
1715 ext4_msg(sb, KERN_DEBUG,
1716 "extending last group from %llu to %llu blocks",
1717 o_blocks_count, n_blocks_count);
1718
1719 if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
1720 return 0;
1721
1722 if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1723 ext4_msg(sb, KERN_ERR,
1724 "filesystem too large to resize to %llu blocks safely",
1725 n_blocks_count);
1726 if (sizeof(sector_t) < 8)
1727 ext4_warning(sb, "CONFIG_LBDAF not enabled");
1728 return -EINVAL;
1729 }
1730
1731 if (n_blocks_count < o_blocks_count) {
1732 ext4_warning(sb, "can't shrink FS - resize aborted");
1733 return -EINVAL;
1734 }
1735
1736
1737 ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1738
1739 if (last == 0) {
1740 ext4_warning(sb, "need to use ext2online to resize further");
1741 return -EPERM;
1742 }
1743
1744 add = EXT4_BLOCKS_PER_GROUP(sb) - last;
1745
1746 if (o_blocks_count + add < o_blocks_count) {
1747 ext4_warning(sb, "blocks_count overflow");
1748 return -EINVAL;
1749 }
1750
1751 if (o_blocks_count + add > n_blocks_count)
1752 add = n_blocks_count - o_blocks_count;
1753
1754 if (o_blocks_count + add < n_blocks_count)
1755 ext4_warning(sb, "will only finish group (%llu blocks, %u new)",
1756 o_blocks_count + add, add);
1757
1758
1759 bh = sb_bread(sb, o_blocks_count + add - 1);
1760 if (!bh) {
1761 ext4_warning(sb, "can't read last block, resize aborted");
1762 return -ENOSPC;
1763 }
1764 brelse(bh);
1765
1766 err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1767 return err;
1768}
1769
1770
1771static int num_desc_blocks(struct super_block *sb, ext4_group_t groups)
1772{
1773 return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb);
1774}
1775
1776
1777
1778
1779
1780
1781static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode)
1782{
1783 handle_t *handle;
1784 struct ext4_sb_info *sbi = EXT4_SB(sb);
1785 struct ext4_super_block *es = sbi->s_es;
1786 struct ext4_inode_info *ei = EXT4_I(inode);
1787 ext4_fsblk_t nr;
1788 int i, ret, err = 0;
1789 int credits = 1;
1790
1791 ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg");
1792 if (inode) {
1793 if (es->s_reserved_gdt_blocks) {
1794 ext4_error(sb, "Unexpected non-zero "
1795 "s_reserved_gdt_blocks");
1796 return -EPERM;
1797 }
1798
1799
1800 if (inode->i_blocks != 1 << (inode->i_blkbits - 9))
1801 goto invalid_resize_inode;
1802 for (i = 0; i < EXT4_N_BLOCKS; i++) {
1803 if (i == EXT4_DIND_BLOCK) {
1804 if (ei->i_data[i])
1805 continue;
1806 else
1807 goto invalid_resize_inode;
1808 }
1809 if (ei->i_data[i])
1810 goto invalid_resize_inode;
1811 }
1812 credits += 3;
1813 }
1814
1815 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits);
1816 if (IS_ERR(handle))
1817 return PTR_ERR(handle);
1818
1819 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1820 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1821 if (err)
1822 goto errout;
1823
1824 ext4_clear_feature_resize_inode(sb);
1825 ext4_set_feature_meta_bg(sb);
1826 sbi->s_es->s_first_meta_bg =
1827 cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count));
1828
1829 err = ext4_handle_dirty_super(handle, sb);
1830 if (err) {
1831 ext4_std_error(sb, err);
1832 goto errout;
1833 }
1834
1835 if (inode) {
1836 nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]);
1837 ext4_free_blocks(handle, inode, NULL, nr, 1,
1838 EXT4_FREE_BLOCKS_METADATA |
1839 EXT4_FREE_BLOCKS_FORGET);
1840 ei->i_data[EXT4_DIND_BLOCK] = 0;
1841 inode->i_blocks = 0;
1842
1843 err = ext4_mark_inode_dirty(handle, inode);
1844 if (err)
1845 ext4_std_error(sb, err);
1846 }
1847
1848errout:
1849 ret = ext4_journal_stop(handle);
1850 if (!err)
1851 err = ret;
1852 return ret;
1853
1854invalid_resize_inode:
1855 ext4_error(sb, "corrupted/inconsistent resize inode");
1856 return -EINVAL;
1857}
1858
1859
1860
1861
1862
1863
1864
1865int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
1866{
1867 struct ext4_new_flex_group_data *flex_gd = NULL;
1868 struct ext4_sb_info *sbi = EXT4_SB(sb);
1869 struct ext4_super_block *es = sbi->s_es;
1870 struct buffer_head *bh;
1871 struct inode *resize_inode = NULL;
1872 ext4_grpblk_t add, offset;
1873 unsigned long n_desc_blocks;
1874 unsigned long o_desc_blocks;
1875 ext4_group_t o_group;
1876 ext4_group_t n_group;
1877 ext4_fsblk_t o_blocks_count;
1878 ext4_fsblk_t n_blocks_count_retry = 0;
1879 unsigned long last_update_time = 0;
1880 int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
1881 int meta_bg;
1882
1883
1884 bh = sb_bread(sb, n_blocks_count - 1);
1885 if (!bh) {
1886 ext4_warning(sb, "can't read last block, resize aborted");
1887 return -ENOSPC;
1888 }
1889 brelse(bh);
1890
1891retry:
1892 o_blocks_count = ext4_blocks_count(es);
1893
1894 ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu "
1895 "to %llu blocks", o_blocks_count, n_blocks_count);
1896
1897 if (n_blocks_count < o_blocks_count) {
1898
1899 ext4_warning(sb, "can't shrink FS - resize aborted");
1900 return -EINVAL;
1901 }
1902
1903 if (n_blocks_count == o_blocks_count)
1904
1905 return 0;
1906
1907 n_group = ext4_get_group_number(sb, n_blocks_count - 1);
1908 if (n_group > (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
1909 ext4_warning(sb, "resize would cause inodes_count overflow");
1910 return -EINVAL;
1911 }
1912 ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
1913
1914 n_desc_blocks = num_desc_blocks(sb, n_group + 1);
1915 o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count);
1916
1917 meta_bg = ext4_has_feature_meta_bg(sb);
1918
1919 if (ext4_has_feature_resize_inode(sb)) {
1920 if (meta_bg) {
1921 ext4_error(sb, "resize_inode and meta_bg enabled "
1922 "simultaneously");
1923 return -EINVAL;
1924 }
1925 if (n_desc_blocks > o_desc_blocks +
1926 le16_to_cpu(es->s_reserved_gdt_blocks)) {
1927 n_blocks_count_retry = n_blocks_count;
1928 n_desc_blocks = o_desc_blocks +
1929 le16_to_cpu(es->s_reserved_gdt_blocks);
1930 n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);
1931 n_blocks_count = (ext4_fsblk_t)n_group *
1932 EXT4_BLOCKS_PER_GROUP(sb);
1933 n_group--;
1934 }
1935
1936 if (!resize_inode)
1937 resize_inode = ext4_iget(sb, EXT4_RESIZE_INO);
1938 if (IS_ERR(resize_inode)) {
1939 ext4_warning(sb, "Error opening resize inode");
1940 return PTR_ERR(resize_inode);
1941 }
1942 }
1943
1944 if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) {
1945 err = ext4_convert_meta_bg(sb, resize_inode);
1946 if (err)
1947 goto out;
1948 if (resize_inode) {
1949 iput(resize_inode);
1950 resize_inode = NULL;
1951 }
1952 if (n_blocks_count_retry) {
1953 n_blocks_count = n_blocks_count_retry;
1954 n_blocks_count_retry = 0;
1955 goto retry;
1956 }
1957 }
1958
1959
1960 if (n_group == o_group)
1961 add = n_blocks_count - o_blocks_count;
1962 else
1963 add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1);
1964 if (add > 0) {
1965 err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1966 if (err)
1967 goto out;
1968 }
1969
1970 if (ext4_blocks_count(es) == n_blocks_count)
1971 goto out;
1972
1973 err = ext4_alloc_flex_bg_array(sb, n_group + 1);
1974 if (err)
1975 return err;
1976
1977 err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
1978 if (err)
1979 goto out;
1980
1981 flex_gd = alloc_flex_gd(flexbg_size);
1982 if (flex_gd == NULL) {
1983 err = -ENOMEM;
1984 goto out;
1985 }
1986
1987
1988
1989
1990 while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
1991 flexbg_size)) {
1992 if (jiffies - last_update_time > HZ * 10) {
1993 if (last_update_time)
1994 ext4_msg(sb, KERN_INFO,
1995 "resized to %llu blocks",
1996 ext4_blocks_count(es));
1997 last_update_time = jiffies;
1998 }
1999 if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
2000 break;
2001 err = ext4_flex_group_add(sb, resize_inode, flex_gd);
2002 if (unlikely(err))
2003 break;
2004 }
2005
2006 if (!err && n_blocks_count_retry) {
2007 n_blocks_count = n_blocks_count_retry;
2008 n_blocks_count_retry = 0;
2009 free_flex_gd(flex_gd);
2010 flex_gd = NULL;
2011 goto retry;
2012 }
2013
2014out:
2015 if (flex_gd)
2016 free_flex_gd(flex_gd);
2017 if (resize_inode != NULL)
2018 iput(resize_inode);
2019 ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count);
2020 return err;
2021}
2022