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11
12#define EXT4FS_DEBUG
13
14#include <linux/errno.h>
15#include <linux/slab.h>
16
17#include "ext4_jbd2.h"
18
19int ext4_resize_begin(struct super_block *sb)
20{
21 int ret = 0;
22
23 if (!capable(CAP_SYS_RESOURCE))
24 return -EPERM;
25
26
27
28
29
30
31 if (EXT4_SB(sb)->s_sbh->b_blocknr !=
32 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
33 ext4_warning(sb, "won't resize using backup superblock at %llu",
34 (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);
35 return -EPERM;
36 }
37
38
39
40
41
42 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
43 ext4_warning(sb, "There are errors in the filesystem, "
44 "so online resizing is not allowed\n");
45 return -EPERM;
46 }
47
48 if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags))
49 ret = -EBUSY;
50
51 return ret;
52}
53
54void ext4_resize_end(struct super_block *sb)
55{
56 clear_bit_unlock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags);
57 smp_mb__after_clear_bit();
58}
59
60static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
61 ext4_group_t group) {
62 return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) <<
63 EXT4_DESC_PER_BLOCK_BITS(sb);
64}
65
66static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
67 ext4_group_t group) {
68 group = ext4_meta_bg_first_group(sb, group);
69 return ext4_group_first_block_no(sb, group);
70}
71
72static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
73 ext4_group_t group) {
74 ext4_grpblk_t overhead;
75 overhead = ext4_bg_num_gdb(sb, group);
76 if (ext4_bg_has_super(sb, group))
77 overhead += 1 +
78 le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
79 return overhead;
80}
81
82#define outside(b, first, last) ((b) < (first) || (b) >= (last))
83#define inside(b, first, last) ((b) >= (first) && (b) < (last))
84
85static int verify_group_input(struct super_block *sb,
86 struct ext4_new_group_data *input)
87{
88 struct ext4_sb_info *sbi = EXT4_SB(sb);
89 struct ext4_super_block *es = sbi->s_es;
90 ext4_fsblk_t start = ext4_blocks_count(es);
91 ext4_fsblk_t end = start + input->blocks_count;
92 ext4_group_t group = input->group;
93 ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
94 unsigned overhead;
95 ext4_fsblk_t metaend;
96 struct buffer_head *bh = NULL;
97 ext4_grpblk_t free_blocks_count, offset;
98 int err = -EINVAL;
99
100 if (group != sbi->s_groups_count) {
101 ext4_warning(sb, "Cannot add at group %u (only %u groups)",
102 input->group, sbi->s_groups_count);
103 return -EINVAL;
104 }
105
106 overhead = ext4_group_overhead_blocks(sb, group);
107 metaend = start + overhead;
108 input->free_blocks_count = free_blocks_count =
109 input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
110
111 if (test_opt(sb, DEBUG))
112 printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks "
113 "(%d free, %u reserved)\n",
114 ext4_bg_has_super(sb, input->group) ? "normal" :
115 "no-super", input->group, input->blocks_count,
116 free_blocks_count, input->reserved_blocks);
117
118 ext4_get_group_no_and_offset(sb, start, NULL, &offset);
119 if (offset != 0)
120 ext4_warning(sb, "Last group not full");
121 else if (input->reserved_blocks > input->blocks_count / 5)
122 ext4_warning(sb, "Reserved blocks too high (%u)",
123 input->reserved_blocks);
124 else if (free_blocks_count < 0)
125 ext4_warning(sb, "Bad blocks count %u",
126 input->blocks_count);
127 else if (!(bh = sb_bread(sb, end - 1)))
128 ext4_warning(sb, "Cannot read last block (%llu)",
129 end - 1);
130 else if (outside(input->block_bitmap, start, end))
131 ext4_warning(sb, "Block bitmap not in group (block %llu)",
132 (unsigned long long)input->block_bitmap);
133 else if (outside(input->inode_bitmap, start, end))
134 ext4_warning(sb, "Inode bitmap not in group (block %llu)",
135 (unsigned long long)input->inode_bitmap);
136 else if (outside(input->inode_table, start, end) ||
137 outside(itend - 1, start, end))
138 ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)",
139 (unsigned long long)input->inode_table, itend - 1);
140 else if (input->inode_bitmap == input->block_bitmap)
141 ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)",
142 (unsigned long long)input->block_bitmap);
143 else if (inside(input->block_bitmap, input->inode_table, itend))
144 ext4_warning(sb, "Block bitmap (%llu) in inode table "
145 "(%llu-%llu)",
146 (unsigned long long)input->block_bitmap,
147 (unsigned long long)input->inode_table, itend - 1);
148 else if (inside(input->inode_bitmap, input->inode_table, itend))
149 ext4_warning(sb, "Inode bitmap (%llu) in inode table "
150 "(%llu-%llu)",
151 (unsigned long long)input->inode_bitmap,
152 (unsigned long long)input->inode_table, itend - 1);
153 else if (inside(input->block_bitmap, start, metaend))
154 ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)",
155 (unsigned long long)input->block_bitmap,
156 start, metaend - 1);
157 else if (inside(input->inode_bitmap, start, metaend))
158 ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)",
159 (unsigned long long)input->inode_bitmap,
160 start, metaend - 1);
161 else if (inside(input->inode_table, start, metaend) ||
162 inside(itend - 1, start, metaend))
163 ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table "
164 "(%llu-%llu)",
165 (unsigned long long)input->inode_table,
166 itend - 1, start, metaend - 1);
167 else
168 err = 0;
169 brelse(bh);
170
171 return err;
172}
173
174
175
176
177
178struct ext4_new_flex_group_data {
179 struct ext4_new_group_data *groups;
180
181 __u16 *bg_flags;
182
183 ext4_group_t count;
184
185};
186
187
188
189
190
191
192
193static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
194{
195 struct ext4_new_flex_group_data *flex_gd;
196
197 flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
198 if (flex_gd == NULL)
199 goto out3;
200
201 if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data))
202 goto out2;
203 flex_gd->count = flexbg_size;
204
205 flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) *
206 flexbg_size, GFP_NOFS);
207 if (flex_gd->groups == NULL)
208 goto out2;
209
210 flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS);
211 if (flex_gd->bg_flags == NULL)
212 goto out1;
213
214 return flex_gd;
215
216out1:
217 kfree(flex_gd->groups);
218out2:
219 kfree(flex_gd);
220out3:
221 return NULL;
222}
223
224static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
225{
226 kfree(flex_gd->bg_flags);
227 kfree(flex_gd->groups);
228 kfree(flex_gd);
229}
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244static int ext4_alloc_group_tables(struct super_block *sb,
245 struct ext4_new_flex_group_data *flex_gd,
246 int flexbg_size)
247{
248 struct ext4_new_group_data *group_data = flex_gd->groups;
249 ext4_fsblk_t start_blk;
250 ext4_fsblk_t last_blk;
251 ext4_group_t src_group;
252 ext4_group_t bb_index = 0;
253 ext4_group_t ib_index = 0;
254 ext4_group_t it_index = 0;
255 ext4_group_t group;
256 ext4_group_t last_group;
257 unsigned overhead;
258 __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
259
260 BUG_ON(flex_gd->count == 0 || group_data == NULL);
261
262 src_group = group_data[0].group;
263 last_group = src_group + flex_gd->count - 1;
264
265 BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
266 (last_group & ~(flexbg_size - 1))));
267next_group:
268 group = group_data[0].group;
269 if (src_group >= group_data[0].group + flex_gd->count)
270 return -ENOSPC;
271 start_blk = ext4_group_first_block_no(sb, src_group);
272 last_blk = start_blk + group_data[src_group - group].blocks_count;
273
274 overhead = ext4_group_overhead_blocks(sb, src_group);
275
276 start_blk += overhead;
277
278
279 src_group++;
280 for (; src_group <= last_group; src_group++) {
281 overhead = ext4_group_overhead_blocks(sb, src_group);
282 if (overhead == 0)
283 last_blk += group_data[src_group - group].blocks_count;
284 else
285 break;
286 }
287
288
289 for (; bb_index < flex_gd->count; bb_index++) {
290 if (start_blk >= last_blk)
291 goto next_group;
292 group_data[bb_index].block_bitmap = start_blk++;
293 group = ext4_get_group_number(sb, start_blk - 1);
294 group -= group_data[0].group;
295 group_data[group].free_blocks_count--;
296 flex_gd->bg_flags[group] &= uninit_mask;
297 }
298
299
300 for (; ib_index < flex_gd->count; ib_index++) {
301 if (start_blk >= last_blk)
302 goto next_group;
303 group_data[ib_index].inode_bitmap = start_blk++;
304 group = ext4_get_group_number(sb, start_blk - 1);
305 group -= group_data[0].group;
306 group_data[group].free_blocks_count--;
307 flex_gd->bg_flags[group] &= uninit_mask;
308 }
309
310
311 for (; it_index < flex_gd->count; it_index++) {
312 unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
313 ext4_fsblk_t next_group_start;
314
315 if (start_blk + itb > last_blk)
316 goto next_group;
317 group_data[it_index].inode_table = start_blk;
318 group = ext4_get_group_number(sb, start_blk);
319 next_group_start = ext4_group_first_block_no(sb, group + 1);
320 group -= group_data[0].group;
321
322 if (start_blk + itb > next_group_start) {
323 flex_gd->bg_flags[group + 1] &= uninit_mask;
324 overhead = start_blk + itb - next_group_start;
325 group_data[group + 1].free_blocks_count -= overhead;
326 itb -= overhead;
327 }
328
329 group_data[group].free_blocks_count -= itb;
330 flex_gd->bg_flags[group] &= uninit_mask;
331 start_blk += EXT4_SB(sb)->s_itb_per_group;
332 }
333
334 if (test_opt(sb, DEBUG)) {
335 int i;
336 group = group_data[0].group;
337
338 printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
339 "%d groups, flexbg size is %d:\n", flex_gd->count,
340 flexbg_size);
341
342 for (i = 0; i < flex_gd->count; i++) {
343 printk(KERN_DEBUG "adding %s group %u: %u "
344 "blocks (%d free)\n",
345 ext4_bg_has_super(sb, group + i) ? "normal" :
346 "no-super", group + i,
347 group_data[i].blocks_count,
348 group_data[i].free_blocks_count);
349 }
350 }
351 return 0;
352}
353
354static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
355 ext4_fsblk_t blk)
356{
357 struct buffer_head *bh;
358 int err;
359
360 bh = sb_getblk(sb, blk);
361 if (unlikely(!bh))
362 return ERR_PTR(-ENOMEM);
363 BUFFER_TRACE(bh, "get_write_access");
364 if ((err = ext4_journal_get_write_access(handle, bh))) {
365 brelse(bh);
366 bh = ERR_PTR(err);
367 } else {
368 memset(bh->b_data, 0, sb->s_blocksize);
369 set_buffer_uptodate(bh);
370 }
371
372 return bh;
373}
374
375
376
377
378
379
380static int extend_or_restart_transaction(handle_t *handle, int thresh)
381{
382 int err;
383
384 if (ext4_handle_has_enough_credits(handle, thresh))
385 return 0;
386
387 err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA);
388 if (err < 0)
389 return err;
390 if (err) {
391 err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA);
392 if (err)
393 return err;
394 }
395
396 return 0;
397}
398
399
400
401
402
403
404
405
406
407
408static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
409 struct ext4_new_flex_group_data *flex_gd,
410 ext4_fsblk_t block, ext4_group_t count)
411{
412 ext4_group_t count2;
413
414 ext4_debug("mark blocks [%llu/%u] used\n", block, count);
415 for (count2 = count; count > 0; count -= count2, block += count2) {
416 ext4_fsblk_t start;
417 struct buffer_head *bh;
418 ext4_group_t group;
419 int err;
420
421 group = ext4_get_group_number(sb, block);
422 start = ext4_group_first_block_no(sb, group);
423 group -= flex_gd->groups[0].group;
424
425 count2 = EXT4_BLOCKS_PER_GROUP(sb) - (block - start);
426 if (count2 > count)
427 count2 = count;
428
429 if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
430 BUG_ON(flex_gd->count > 1);
431 continue;
432 }
433
434 err = extend_or_restart_transaction(handle, 1);
435 if (err)
436 return err;
437
438 bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
439 if (unlikely(!bh))
440 return -ENOMEM;
441
442 BUFFER_TRACE(bh, "get_write_access");
443 err = ext4_journal_get_write_access(handle, bh);
444 if (err)
445 return err;
446 ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block,
447 block - start, count2);
448 ext4_set_bits(bh->b_data, block - start, count2);
449
450 err = ext4_handle_dirty_metadata(handle, NULL, bh);
451 if (unlikely(err))
452 return err;
453 brelse(bh);
454 }
455
456 return 0;
457}
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473static int setup_new_flex_group_blocks(struct super_block *sb,
474 struct ext4_new_flex_group_data *flex_gd)
475{
476 int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
477 ext4_fsblk_t start;
478 ext4_fsblk_t block;
479 struct ext4_sb_info *sbi = EXT4_SB(sb);
480 struct ext4_super_block *es = sbi->s_es;
481 struct ext4_new_group_data *group_data = flex_gd->groups;
482 __u16 *bg_flags = flex_gd->bg_flags;
483 handle_t *handle;
484 ext4_group_t group, count;
485 struct buffer_head *bh = NULL;
486 int reserved_gdb, i, j, err = 0, err2;
487 int meta_bg;
488
489 BUG_ON(!flex_gd->count || !group_data ||
490 group_data[0].group != sbi->s_groups_count);
491
492 reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
493 meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
494
495
496 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
497 if (IS_ERR(handle))
498 return PTR_ERR(handle);
499
500 group = group_data[0].group;
501 for (i = 0; i < flex_gd->count; i++, group++) {
502 unsigned long gdblocks;
503 ext4_grpblk_t overhead;
504
505 gdblocks = ext4_bg_num_gdb(sb, group);
506 start = ext4_group_first_block_no(sb, group);
507
508 if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
509 goto handle_itb;
510
511 if (meta_bg == 1) {
512 ext4_group_t first_group;
513 first_group = ext4_meta_bg_first_group(sb, group);
514 if (first_group != group + 1 &&
515 first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
516 goto handle_itb;
517 }
518
519 block = start + ext4_bg_has_super(sb, group);
520
521 for (j = 0; j < gdblocks; j++, block++) {
522 struct buffer_head *gdb;
523
524 ext4_debug("update backup group %#04llx\n", block);
525 err = extend_or_restart_transaction(handle, 1);
526 if (err)
527 goto out;
528
529 gdb = sb_getblk(sb, block);
530 if (unlikely(!gdb)) {
531 err = -ENOMEM;
532 goto out;
533 }
534
535 BUFFER_TRACE(gdb, "get_write_access");
536 err = ext4_journal_get_write_access(handle, gdb);
537 if (err) {
538 brelse(gdb);
539 goto out;
540 }
541 memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data,
542 gdb->b_size);
543 set_buffer_uptodate(gdb);
544
545 err = ext4_handle_dirty_metadata(handle, NULL, gdb);
546 if (unlikely(err)) {
547 brelse(gdb);
548 goto out;
549 }
550 brelse(gdb);
551 }
552
553
554
555
556 if (ext4_bg_has_super(sb, group)) {
557 err = sb_issue_zeroout(sb, gdblocks + start + 1,
558 reserved_gdb, GFP_NOFS);
559 if (err)
560 goto out;
561 }
562
563handle_itb:
564
565 if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
566 goto handle_bb;
567
568
569 block = group_data[i].inode_table;
570 ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
571 block, sbi->s_itb_per_group);
572 err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
573 GFP_NOFS);
574 if (err)
575 goto out;
576
577handle_bb:
578 if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
579 goto handle_ib;
580
581
582 block = group_data[i].block_bitmap;
583 err = extend_or_restart_transaction(handle, 1);
584 if (err)
585 goto out;
586
587 bh = bclean(handle, sb, block);
588 if (IS_ERR(bh)) {
589 err = PTR_ERR(bh);
590 bh = NULL;
591 goto out;
592 }
593 overhead = ext4_group_overhead_blocks(sb, group);
594 if (overhead != 0) {
595 ext4_debug("mark backup superblock %#04llx (+0)\n",
596 start);
597 ext4_set_bits(bh->b_data, 0, overhead);
598 }
599 ext4_mark_bitmap_end(group_data[i].blocks_count,
600 sb->s_blocksize * 8, bh->b_data);
601 err = ext4_handle_dirty_metadata(handle, NULL, bh);
602 if (err)
603 goto out;
604 brelse(bh);
605
606handle_ib:
607 if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
608 continue;
609
610
611 block = group_data[i].inode_bitmap;
612 err = extend_or_restart_transaction(handle, 1);
613 if (err)
614 goto out;
615
616 bh = bclean(handle, sb, block);
617 if (IS_ERR(bh)) {
618 err = PTR_ERR(bh);
619 bh = NULL;
620 goto out;
621 }
622
623 ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
624 sb->s_blocksize * 8, bh->b_data);
625 err = ext4_handle_dirty_metadata(handle, NULL, bh);
626 if (err)
627 goto out;
628 brelse(bh);
629 }
630 bh = NULL;
631
632
633 for (j = 0; j < GROUP_TABLE_COUNT; j++) {
634 count = group_table_count[j];
635 start = (&group_data[0].block_bitmap)[j];
636 block = start;
637 for (i = 1; i < flex_gd->count; i++) {
638 block += group_table_count[j];
639 if (block == (&group_data[i].block_bitmap)[j]) {
640 count += group_table_count[j];
641 continue;
642 }
643 err = set_flexbg_block_bitmap(sb, handle,
644 flex_gd, start, count);
645 if (err)
646 goto out;
647 count = group_table_count[j];
648 start = (&group_data[i].block_bitmap)[j];
649 block = start;
650 }
651
652 if (count) {
653 err = set_flexbg_block_bitmap(sb, handle,
654 flex_gd, start, count);
655 if (err)
656 goto out;
657 }
658 }
659
660out:
661 brelse(bh);
662 err2 = ext4_journal_stop(handle);
663 if (err2 && !err)
664 err = err2;
665
666 return err;
667}
668
669
670
671
672
673
674
675
676static unsigned ext4_list_backups(struct super_block *sb, unsigned *three,
677 unsigned *five, unsigned *seven)
678{
679 unsigned *min = three;
680 int mult = 3;
681 unsigned ret;
682
683 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
684 EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
685 ret = *min;
686 *min += 1;
687 return ret;
688 }
689
690 if (*five < *min) {
691 min = five;
692 mult = 5;
693 }
694 if (*seven < *min) {
695 min = seven;
696 mult = 7;
697 }
698
699 ret = *min;
700 *min *= mult;
701
702 return ret;
703}
704
705
706
707
708
709
710static int verify_reserved_gdb(struct super_block *sb,
711 ext4_group_t end,
712 struct buffer_head *primary)
713{
714 const ext4_fsblk_t blk = primary->b_blocknr;
715 unsigned three = 1;
716 unsigned five = 5;
717 unsigned seven = 7;
718 unsigned grp;
719 __le32 *p = (__le32 *)primary->b_data;
720 int gdbackups = 0;
721
722 while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) {
723 if (le32_to_cpu(*p++) !=
724 grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){
725 ext4_warning(sb, "reserved GDT %llu"
726 " missing grp %d (%llu)",
727 blk, grp,
728 grp *
729 (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
730 blk);
731 return -EINVAL;
732 }
733 if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb))
734 return -EFBIG;
735 }
736
737 return gdbackups;
738}
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753static int add_new_gdb(handle_t *handle, struct inode *inode,
754 ext4_group_t group)
755{
756 struct super_block *sb = inode->i_sb;
757 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
758 unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
759 ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
760 struct buffer_head **o_group_desc, **n_group_desc;
761 struct buffer_head *dind;
762 struct buffer_head *gdb_bh;
763 int gdbackups;
764 struct ext4_iloc iloc;
765 __le32 *data;
766 int err;
767
768 if (test_opt(sb, DEBUG))
769 printk(KERN_DEBUG
770 "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n",
771 gdb_num);
772
773 gdb_bh = sb_bread(sb, gdblock);
774 if (!gdb_bh)
775 return -EIO;
776
777 gdbackups = verify_reserved_gdb(sb, group, gdb_bh);
778 if (gdbackups < 0) {
779 err = gdbackups;
780 goto exit_bh;
781 }
782
783 data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
784 dind = sb_bread(sb, le32_to_cpu(*data));
785 if (!dind) {
786 err = -EIO;
787 goto exit_bh;
788 }
789
790 data = (__le32 *)dind->b_data;
791 if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) {
792 ext4_warning(sb, "new group %u GDT block %llu not reserved",
793 group, gdblock);
794 err = -EINVAL;
795 goto exit_dind;
796 }
797
798 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
799 err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
800 if (unlikely(err))
801 goto exit_dind;
802
803 BUFFER_TRACE(gdb_bh, "get_write_access");
804 err = ext4_journal_get_write_access(handle, gdb_bh);
805 if (unlikely(err))
806 goto exit_dind;
807
808 BUFFER_TRACE(dind, "get_write_access");
809 err = ext4_journal_get_write_access(handle, dind);
810 if (unlikely(err))
811 ext4_std_error(sb, err);
812
813
814 err = ext4_reserve_inode_write(handle, inode, &iloc);
815 if (unlikely(err))
816 goto exit_dind;
817
818 n_group_desc = ext4_kvmalloc((gdb_num + 1) *
819 sizeof(struct buffer_head *),
820 GFP_NOFS);
821 if (!n_group_desc) {
822 err = -ENOMEM;
823 ext4_warning(sb, "not enough memory for %lu groups",
824 gdb_num + 1);
825 goto exit_inode;
826 }
827
828
829
830
831
832
833
834
835
836
837 data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0;
838 err = ext4_handle_dirty_metadata(handle, NULL, dind);
839 if (unlikely(err)) {
840 ext4_std_error(sb, err);
841 goto exit_inode;
842 }
843 inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9;
844 ext4_mark_iloc_dirty(handle, inode, &iloc);
845 memset(gdb_bh->b_data, 0, sb->s_blocksize);
846 err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
847 if (unlikely(err)) {
848 ext4_std_error(sb, err);
849 goto exit_inode;
850 }
851 brelse(dind);
852
853 o_group_desc = EXT4_SB(sb)->s_group_desc;
854 memcpy(n_group_desc, o_group_desc,
855 EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
856 n_group_desc[gdb_num] = gdb_bh;
857 EXT4_SB(sb)->s_group_desc = n_group_desc;
858 EXT4_SB(sb)->s_gdb_count++;
859 ext4_kvfree(o_group_desc);
860
861 le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
862 err = ext4_handle_dirty_super(handle, sb);
863 if (err)
864 ext4_std_error(sb, err);
865
866 return err;
867
868exit_inode:
869 ext4_kvfree(n_group_desc);
870 brelse(iloc.bh);
871exit_dind:
872 brelse(dind);
873exit_bh:
874 brelse(gdb_bh);
875
876 ext4_debug("leaving with error %d\n", err);
877 return err;
878}
879
880
881
882
883static int add_new_gdb_meta_bg(struct super_block *sb,
884 handle_t *handle, ext4_group_t group) {
885 ext4_fsblk_t gdblock;
886 struct buffer_head *gdb_bh;
887 struct buffer_head **o_group_desc, **n_group_desc;
888 unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
889 int err;
890
891 gdblock = ext4_meta_bg_first_block_no(sb, group) +
892 ext4_bg_has_super(sb, group);
893 gdb_bh = sb_bread(sb, gdblock);
894 if (!gdb_bh)
895 return -EIO;
896 n_group_desc = ext4_kvmalloc((gdb_num + 1) *
897 sizeof(struct buffer_head *),
898 GFP_NOFS);
899 if (!n_group_desc) {
900 err = -ENOMEM;
901 ext4_warning(sb, "not enough memory for %lu groups",
902 gdb_num + 1);
903 return err;
904 }
905
906 o_group_desc = EXT4_SB(sb)->s_group_desc;
907 memcpy(n_group_desc, o_group_desc,
908 EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
909 n_group_desc[gdb_num] = gdb_bh;
910 EXT4_SB(sb)->s_group_desc = n_group_desc;
911 EXT4_SB(sb)->s_gdb_count++;
912 ext4_kvfree(o_group_desc);
913 BUFFER_TRACE(gdb_bh, "get_write_access");
914 err = ext4_journal_get_write_access(handle, gdb_bh);
915 if (unlikely(err))
916 brelse(gdb_bh);
917 return err;
918}
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
934 ext4_group_t group)
935{
936 struct super_block *sb = inode->i_sb;
937 int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
938 struct buffer_head **primary;
939 struct buffer_head *dind;
940 struct ext4_iloc iloc;
941 ext4_fsblk_t blk;
942 __le32 *data, *end;
943 int gdbackups = 0;
944 int res, i;
945 int err;
946
947 primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS);
948 if (!primary)
949 return -ENOMEM;
950
951 data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
952 dind = sb_bread(sb, le32_to_cpu(*data));
953 if (!dind) {
954 err = -EIO;
955 goto exit_free;
956 }
957
958 blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
959 data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
960 EXT4_ADDR_PER_BLOCK(sb));
961 end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
962
963
964 for (res = 0; res < reserved_gdb; res++, blk++) {
965 if (le32_to_cpu(*data) != blk) {
966 ext4_warning(sb, "reserved block %llu"
967 " not at offset %ld",
968 blk,
969 (long)(data - (__le32 *)dind->b_data));
970 err = -EINVAL;
971 goto exit_bh;
972 }
973 primary[res] = sb_bread(sb, blk);
974 if (!primary[res]) {
975 err = -EIO;
976 goto exit_bh;
977 }
978 gdbackups = verify_reserved_gdb(sb, group, primary[res]);
979 if (gdbackups < 0) {
980 brelse(primary[res]);
981 err = gdbackups;
982 goto exit_bh;
983 }
984 if (++data >= end)
985 data = (__le32 *)dind->b_data;
986 }
987
988 for (i = 0; i < reserved_gdb; i++) {
989 BUFFER_TRACE(primary[i], "get_write_access");
990 if ((err = ext4_journal_get_write_access(handle, primary[i])))
991 goto exit_bh;
992 }
993
994 if ((err = ext4_reserve_inode_write(handle, inode, &iloc)))
995 goto exit_bh;
996
997
998
999
1000
1001 blk = group * EXT4_BLOCKS_PER_GROUP(sb);
1002 for (i = 0; i < reserved_gdb; i++) {
1003 int err2;
1004 data = (__le32 *)primary[i]->b_data;
1005
1006
1007
1008 data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
1009 err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]);
1010 if (!err)
1011 err = err2;
1012 }
1013 inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9;
1014 ext4_mark_iloc_dirty(handle, inode, &iloc);
1015
1016exit_bh:
1017 while (--res >= 0)
1018 brelse(primary[res]);
1019 brelse(dind);
1020
1021exit_free:
1022 kfree(primary);
1023
1024 return err;
1025}
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043static void update_backups(struct super_block *sb, sector_t blk_off, char *data,
1044 int size, int meta_bg)
1045{
1046 struct ext4_sb_info *sbi = EXT4_SB(sb);
1047 ext4_group_t last;
1048 const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
1049 unsigned three = 1;
1050 unsigned five = 5;
1051 unsigned seven = 7;
1052 ext4_group_t group = 0;
1053 int rest = sb->s_blocksize - size;
1054 handle_t *handle;
1055 int err = 0, err2;
1056
1057 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
1058 if (IS_ERR(handle)) {
1059 group = 1;
1060 err = PTR_ERR(handle);
1061 goto exit_err;
1062 }
1063
1064 if (meta_bg == 0) {
1065 group = ext4_list_backups(sb, &three, &five, &seven);
1066 last = sbi->s_groups_count;
1067 } else {
1068 group = ext4_get_group_number(sb, blk_off) + 1;
1069 last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
1070 }
1071
1072 while (group < sbi->s_groups_count) {
1073 struct buffer_head *bh;
1074 ext4_fsblk_t backup_block;
1075
1076
1077 if (ext4_handle_valid(handle) &&
1078 handle->h_buffer_credits == 0 &&
1079 ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) &&
1080 (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA)))
1081 break;
1082
1083 if (meta_bg == 0)
1084 backup_block = ((ext4_fsblk_t)group) * bpg + blk_off;
1085 else
1086 backup_block = (ext4_group_first_block_no(sb, group) +
1087 ext4_bg_has_super(sb, group));
1088
1089 bh = sb_getblk(sb, backup_block);
1090 if (unlikely(!bh)) {
1091 err = -ENOMEM;
1092 break;
1093 }
1094 ext4_debug("update metadata backup %llu(+%llu)\n",
1095 backup_block, backup_block -
1096 ext4_group_first_block_no(sb, group));
1097 BUFFER_TRACE(bh, "get_write_access");
1098 if ((err = ext4_journal_get_write_access(handle, bh)))
1099 break;
1100 lock_buffer(bh);
1101 memcpy(bh->b_data, data, size);
1102 if (rest)
1103 memset(bh->b_data + size, 0, rest);
1104 set_buffer_uptodate(bh);
1105 unlock_buffer(bh);
1106 err = ext4_handle_dirty_metadata(handle, NULL, bh);
1107 if (unlikely(err))
1108 ext4_std_error(sb, err);
1109 brelse(bh);
1110
1111 if (meta_bg == 0)
1112 group = ext4_list_backups(sb, &three, &five, &seven);
1113 else if (group == last)
1114 break;
1115 else
1116 group = last;
1117 }
1118 if ((err2 = ext4_journal_stop(handle)) && !err)
1119 err = err2;
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131exit_err:
1132 if (err) {
1133 ext4_warning(sb, "can't update backup for group %u (err %d), "
1134 "forcing fsck on next reboot", group, err);
1135 sbi->s_mount_state &= ~EXT4_VALID_FS;
1136 sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1137 mark_buffer_dirty(sbi->s_sbh);
1138 }
1139}
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
1152 ext4_group_t group, struct inode *resize_inode,
1153 ext4_group_t count)
1154{
1155 struct ext4_sb_info *sbi = EXT4_SB(sb);
1156 struct ext4_super_block *es = sbi->s_es;
1157 struct buffer_head *gdb_bh;
1158 int i, gdb_off, gdb_num, err = 0;
1159 int meta_bg;
1160
1161 meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
1162 for (i = 0; i < count; i++, group++) {
1163 int reserved_gdb = ext4_bg_has_super(sb, group) ?
1164 le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1165
1166 gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1167 gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1168
1169
1170
1171
1172
1173
1174
1175 if (gdb_off) {
1176 gdb_bh = sbi->s_group_desc[gdb_num];
1177 BUFFER_TRACE(gdb_bh, "get_write_access");
1178 err = ext4_journal_get_write_access(handle, gdb_bh);
1179
1180 if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
1181 err = reserve_backup_gdb(handle, resize_inode, group);
1182 } else if (meta_bg != 0) {
1183 err = add_new_gdb_meta_bg(sb, handle, group);
1184 } else {
1185 err = add_new_gdb(handle, resize_inode, group);
1186 }
1187 if (err)
1188 break;
1189 }
1190 return err;
1191}
1192
1193static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
1194{
1195 struct buffer_head *bh = sb_getblk(sb, block);
1196 if (unlikely(!bh))
1197 return NULL;
1198 if (!bh_uptodate_or_lock(bh)) {
1199 if (bh_submit_read(bh) < 0) {
1200 brelse(bh);
1201 return NULL;
1202 }
1203 }
1204
1205 return bh;
1206}
1207
1208static int ext4_set_bitmap_checksums(struct super_block *sb,
1209 ext4_group_t group,
1210 struct ext4_group_desc *gdp,
1211 struct ext4_new_group_data *group_data)
1212{
1213 struct buffer_head *bh;
1214
1215 if (!ext4_has_metadata_csum(sb))
1216 return 0;
1217
1218 bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
1219 if (!bh)
1220 return -EIO;
1221 ext4_inode_bitmap_csum_set(sb, group, gdp, bh,
1222 EXT4_INODES_PER_GROUP(sb) / 8);
1223 brelse(bh);
1224
1225 bh = ext4_get_bitmap(sb, group_data->block_bitmap);
1226 if (!bh)
1227 return -EIO;
1228 ext4_block_bitmap_csum_set(sb, group, gdp, bh);
1229 brelse(bh);
1230
1231 return 0;
1232}
1233
1234
1235
1236
1237static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
1238 struct ext4_new_flex_group_data *flex_gd)
1239{
1240 struct ext4_new_group_data *group_data = flex_gd->groups;
1241 struct ext4_group_desc *gdp;
1242 struct ext4_sb_info *sbi = EXT4_SB(sb);
1243 struct buffer_head *gdb_bh;
1244 ext4_group_t group;
1245 __u16 *bg_flags = flex_gd->bg_flags;
1246 int i, gdb_off, gdb_num, err = 0;
1247
1248
1249 for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
1250 group = group_data->group;
1251
1252 gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1253 gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1254
1255
1256
1257
1258 gdb_bh = sbi->s_group_desc[gdb_num];
1259
1260 gdp = (struct ext4_group_desc *)(gdb_bh->b_data +
1261 gdb_off * EXT4_DESC_SIZE(sb));
1262
1263 memset(gdp, 0, EXT4_DESC_SIZE(sb));
1264 ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
1265 ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
1266 err = ext4_set_bitmap_checksums(sb, group, gdp, group_data);
1267 if (err) {
1268 ext4_std_error(sb, err);
1269 break;
1270 }
1271
1272 ext4_inode_table_set(sb, gdp, group_data->inode_table);
1273 ext4_free_group_clusters_set(sb, gdp,
1274 EXT4_NUM_B2C(sbi, group_data->free_blocks_count));
1275 ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
1276 if (ext4_has_group_desc_csum(sb))
1277 ext4_itable_unused_set(sb, gdp,
1278 EXT4_INODES_PER_GROUP(sb));
1279 gdp->bg_flags = cpu_to_le16(*bg_flags);
1280 ext4_group_desc_csum_set(sb, group, gdp);
1281
1282 err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
1283 if (unlikely(err)) {
1284 ext4_std_error(sb, err);
1285 break;
1286 }
1287
1288
1289
1290
1291
1292 err = ext4_mb_add_groupinfo(sb, group, gdp);
1293 if (err)
1294 break;
1295 }
1296 return err;
1297}
1298
1299
1300
1301
1302
1303
1304
1305
1306static void ext4_update_super(struct super_block *sb,
1307 struct ext4_new_flex_group_data *flex_gd)
1308{
1309 ext4_fsblk_t blocks_count = 0;
1310 ext4_fsblk_t free_blocks = 0;
1311 ext4_fsblk_t reserved_blocks = 0;
1312 struct ext4_new_group_data *group_data = flex_gd->groups;
1313 struct ext4_sb_info *sbi = EXT4_SB(sb);
1314 struct ext4_super_block *es = sbi->s_es;
1315 int i;
1316
1317 BUG_ON(flex_gd->count == 0 || group_data == NULL);
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328 for (i = 0; i < flex_gd->count; i++) {
1329 blocks_count += group_data[i].blocks_count;
1330 free_blocks += group_data[i].free_blocks_count;
1331 }
1332
1333 reserved_blocks = ext4_r_blocks_count(es) * 100;
1334 reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
1335 reserved_blocks *= blocks_count;
1336 do_div(reserved_blocks, 100);
1337
1338 ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
1339 ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
1340 le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1341 flex_gd->count);
1342 le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1343 flex_gd->count);
1344
1345 ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364 smp_wmb();
1365
1366
1367 sbi->s_groups_count += flex_gd->count;
1368 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
1369 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
1370
1371
1372
1373 ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
1374 reserved_blocks);
1375
1376
1377 percpu_counter_add(&sbi->s_freeclusters_counter,
1378 EXT4_NUM_B2C(sbi, free_blocks));
1379 percpu_counter_add(&sbi->s_freeinodes_counter,
1380 EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
1381
1382 ext4_debug("free blocks count %llu",
1383 percpu_counter_read(&sbi->s_freeclusters_counter));
1384 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
1385 EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
1386 sbi->s_log_groups_per_flex) {
1387 ext4_group_t flex_group;
1388 flex_group = ext4_flex_group(sbi, group_data[0].group);
1389 atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
1390 &sbi->s_flex_groups[flex_group].free_clusters);
1391 atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
1392 &sbi->s_flex_groups[flex_group].free_inodes);
1393 }
1394
1395
1396
1397
1398 ext4_calculate_overhead(sb);
1399
1400 if (test_opt(sb, DEBUG))
1401 printk(KERN_DEBUG "EXT4-fs: added group %u:"
1402 "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
1403 blocks_count, free_blocks, reserved_blocks);
1404}
1405
1406
1407
1408
1409
1410static int ext4_flex_group_add(struct super_block *sb,
1411 struct inode *resize_inode,
1412 struct ext4_new_flex_group_data *flex_gd)
1413{
1414 struct ext4_sb_info *sbi = EXT4_SB(sb);
1415 struct ext4_super_block *es = sbi->s_es;
1416 ext4_fsblk_t o_blocks_count;
1417 ext4_grpblk_t last;
1418 ext4_group_t group;
1419 handle_t *handle;
1420 unsigned reserved_gdb;
1421 int err = 0, err2 = 0, credit;
1422
1423 BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags);
1424
1425 reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
1426 o_blocks_count = ext4_blocks_count(es);
1427 ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1428 BUG_ON(last);
1429
1430 err = setup_new_flex_group_blocks(sb, flex_gd);
1431 if (err)
1432 goto exit;
1433
1434
1435
1436
1437
1438
1439
1440 credit = 3;
1441
1442 credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb));
1443 credit += reserved_gdb;
1444 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit);
1445 if (IS_ERR(handle)) {
1446 err = PTR_ERR(handle);
1447 goto exit;
1448 }
1449
1450 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1451 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1452 if (err)
1453 goto exit_journal;
1454
1455 group = flex_gd->groups[0].group;
1456 BUG_ON(group != EXT4_SB(sb)->s_groups_count);
1457 err = ext4_add_new_descs(handle, sb, group,
1458 resize_inode, flex_gd->count);
1459 if (err)
1460 goto exit_journal;
1461
1462 err = ext4_setup_new_descs(handle, sb, flex_gd);
1463 if (err)
1464 goto exit_journal;
1465
1466 ext4_update_super(sb, flex_gd);
1467
1468 err = ext4_handle_dirty_super(handle, sb);
1469
1470exit_journal:
1471 err2 = ext4_journal_stop(handle);
1472 if (!err)
1473 err = err2;
1474
1475 if (!err) {
1476 int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1477 int gdb_num_end = ((group + flex_gd->count - 1) /
1478 EXT4_DESC_PER_BLOCK(sb));
1479 int meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb,
1480 EXT4_FEATURE_INCOMPAT_META_BG);
1481 sector_t old_gdb = 0;
1482
1483 update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
1484 sizeof(struct ext4_super_block), 0);
1485 for (; gdb_num <= gdb_num_end; gdb_num++) {
1486 struct buffer_head *gdb_bh;
1487
1488 gdb_bh = sbi->s_group_desc[gdb_num];
1489 if (old_gdb == gdb_bh->b_blocknr)
1490 continue;
1491 update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
1492 gdb_bh->b_size, meta_bg);
1493 old_gdb = gdb_bh->b_blocknr;
1494 }
1495 }
1496exit:
1497 return err;
1498}
1499
1500static int ext4_setup_next_flex_gd(struct super_block *sb,
1501 struct ext4_new_flex_group_data *flex_gd,
1502 ext4_fsblk_t n_blocks_count,
1503 unsigned long flexbg_size)
1504{
1505 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1506 struct ext4_new_group_data *group_data = flex_gd->groups;
1507 ext4_fsblk_t o_blocks_count;
1508 ext4_group_t n_group;
1509 ext4_group_t group;
1510 ext4_group_t last_group;
1511 ext4_grpblk_t last;
1512 ext4_grpblk_t blocks_per_group;
1513 unsigned long i;
1514
1515 blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb);
1516
1517 o_blocks_count = ext4_blocks_count(es);
1518
1519 if (o_blocks_count == n_blocks_count)
1520 return 0;
1521
1522 ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1523 BUG_ON(last);
1524 ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);
1525
1526 last_group = group | (flexbg_size - 1);
1527 if (last_group > n_group)
1528 last_group = n_group;
1529
1530 flex_gd->count = last_group - group + 1;
1531
1532 for (i = 0; i < flex_gd->count; i++) {
1533 int overhead;
1534
1535 group_data[i].group = group + i;
1536 group_data[i].blocks_count = blocks_per_group;
1537 overhead = ext4_group_overhead_blocks(sb, group + i);
1538 group_data[i].free_blocks_count = blocks_per_group - overhead;
1539 if (ext4_has_group_desc_csum(sb)) {
1540 flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
1541 EXT4_BG_INODE_UNINIT;
1542 if (!test_opt(sb, INIT_INODE_TABLE))
1543 flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED;
1544 } else
1545 flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED;
1546 }
1547
1548 if (last_group == n_group && ext4_has_group_desc_csum(sb))
1549
1550 flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT;
1551
1552 if ((last_group == n_group) && (last != blocks_per_group - 1)) {
1553 group_data[i - 1].blocks_count = last + 1;
1554 group_data[i - 1].free_blocks_count -= blocks_per_group-
1555 last - 1;
1556 }
1557
1558 return 1;
1559}
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
1575{
1576 struct ext4_new_flex_group_data flex_gd;
1577 struct ext4_sb_info *sbi = EXT4_SB(sb);
1578 struct ext4_super_block *es = sbi->s_es;
1579 int reserved_gdb = ext4_bg_has_super(sb, input->group) ?
1580 le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1581 struct inode *inode = NULL;
1582 int gdb_off;
1583 int err;
1584 __u16 bg_flags = 0;
1585
1586 gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb);
1587
1588 if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb,
1589 EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
1590 ext4_warning(sb, "Can't resize non-sparse filesystem further");
1591 return -EPERM;
1592 }
1593
1594 if (ext4_blocks_count(es) + input->blocks_count <
1595 ext4_blocks_count(es)) {
1596 ext4_warning(sb, "blocks_count overflow");
1597 return -EINVAL;
1598 }
1599
1600 if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) <
1601 le32_to_cpu(es->s_inodes_count)) {
1602 ext4_warning(sb, "inodes_count overflow");
1603 return -EINVAL;
1604 }
1605
1606 if (reserved_gdb || gdb_off == 0) {
1607 if (!EXT4_HAS_COMPAT_FEATURE(sb,
1608 EXT4_FEATURE_COMPAT_RESIZE_INODE)
1609 || !le16_to_cpu(es->s_reserved_gdt_blocks)) {
1610 ext4_warning(sb,
1611 "No reserved GDT blocks, can't resize");
1612 return -EPERM;
1613 }
1614 inode = ext4_iget(sb, EXT4_RESIZE_INO);
1615 if (IS_ERR(inode)) {
1616 ext4_warning(sb, "Error opening resize inode");
1617 return PTR_ERR(inode);
1618 }
1619 }
1620
1621
1622 err = verify_group_input(sb, input);
1623 if (err)
1624 goto out;
1625
1626 err = ext4_alloc_flex_bg_array(sb, input->group + 1);
1627 if (err)
1628 goto out;
1629
1630 err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
1631 if (err)
1632 goto out;
1633
1634 flex_gd.count = 1;
1635 flex_gd.groups = input;
1636 flex_gd.bg_flags = &bg_flags;
1637 err = ext4_flex_group_add(sb, inode, &flex_gd);
1638out:
1639 iput(inode);
1640 return err;
1641}
1642
1643
1644
1645
1646static int ext4_group_extend_no_check(struct super_block *sb,
1647 ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
1648{
1649 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1650 handle_t *handle;
1651 int err = 0, err2;
1652
1653
1654
1655
1656 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3);
1657 if (IS_ERR(handle)) {
1658 err = PTR_ERR(handle);
1659 ext4_warning(sb, "error %d on journal start", err);
1660 return err;
1661 }
1662
1663 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
1664 err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
1665 if (err) {
1666 ext4_warning(sb, "error %d on journal write access", err);
1667 goto errout;
1668 }
1669
1670 ext4_blocks_count_set(es, o_blocks_count + add);
1671 ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);
1672 ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
1673 o_blocks_count + add);
1674
1675 err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
1676 if (err)
1677 goto errout;
1678 ext4_handle_dirty_super(handle, sb);
1679 ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
1680 o_blocks_count + add);
1681errout:
1682 err2 = ext4_journal_stop(handle);
1683 if (err2 && !err)
1684 err = err2;
1685
1686 if (!err) {
1687 if (test_opt(sb, DEBUG))
1688 printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
1689 "blocks\n", ext4_blocks_count(es));
1690 update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr,
1691 (char *)es, sizeof(struct ext4_super_block), 0);
1692 }
1693 return err;
1694}
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1707 ext4_fsblk_t n_blocks_count)
1708{
1709 ext4_fsblk_t o_blocks_count;
1710 ext4_grpblk_t last;
1711 ext4_grpblk_t add;
1712 struct buffer_head *bh;
1713 int err;
1714 ext4_group_t group;
1715
1716 o_blocks_count = ext4_blocks_count(es);
1717
1718 if (test_opt(sb, DEBUG))
1719 ext4_msg(sb, KERN_DEBUG,
1720 "extending last group from %llu to %llu blocks",
1721 o_blocks_count, n_blocks_count);
1722
1723 if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
1724 return 0;
1725
1726 if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1727 ext4_msg(sb, KERN_ERR,
1728 "filesystem too large to resize to %llu blocks safely",
1729 n_blocks_count);
1730 if (sizeof(sector_t) < 8)
1731 ext4_warning(sb, "CONFIG_LBDAF not enabled");
1732 return -EINVAL;
1733 }
1734
1735 if (n_blocks_count < o_blocks_count) {
1736 ext4_warning(sb, "can't shrink FS - resize aborted");
1737 return -EINVAL;
1738 }
1739
1740
1741 ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1742
1743 if (last == 0) {
1744 ext4_warning(sb, "need to use ext2online to resize further");
1745 return -EPERM;
1746 }
1747
1748 add = EXT4_BLOCKS_PER_GROUP(sb) - last;
1749
1750 if (o_blocks_count + add < o_blocks_count) {
1751 ext4_warning(sb, "blocks_count overflow");
1752 return -EINVAL;
1753 }
1754
1755 if (o_blocks_count + add > n_blocks_count)
1756 add = n_blocks_count - o_blocks_count;
1757
1758 if (o_blocks_count + add < n_blocks_count)
1759 ext4_warning(sb, "will only finish group (%llu blocks, %u new)",
1760 o_blocks_count + add, add);
1761
1762
1763 bh = sb_bread(sb, o_blocks_count + add - 1);
1764 if (!bh) {
1765 ext4_warning(sb, "can't read last block, resize aborted");
1766 return -ENOSPC;
1767 }
1768 brelse(bh);
1769
1770 err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1771 return err;
1772}
1773
1774
1775static int num_desc_blocks(struct super_block *sb, ext4_group_t groups)
1776{
1777 return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb);
1778}
1779
1780
1781
1782
1783
1784
1785static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode)
1786{
1787 handle_t *handle;
1788 struct ext4_sb_info *sbi = EXT4_SB(sb);
1789 struct ext4_super_block *es = sbi->s_es;
1790 struct ext4_inode_info *ei = EXT4_I(inode);
1791 ext4_fsblk_t nr;
1792 int i, ret, err = 0;
1793 int credits = 1;
1794
1795 ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg");
1796 if (inode) {
1797 if (es->s_reserved_gdt_blocks) {
1798 ext4_error(sb, "Unexpected non-zero "
1799 "s_reserved_gdt_blocks");
1800 return -EPERM;
1801 }
1802
1803
1804 if (inode->i_blocks != 1 << (inode->i_blkbits - 9))
1805 goto invalid_resize_inode;
1806 for (i = 0; i < EXT4_N_BLOCKS; i++) {
1807 if (i == EXT4_DIND_BLOCK) {
1808 if (ei->i_data[i])
1809 continue;
1810 else
1811 goto invalid_resize_inode;
1812 }
1813 if (ei->i_data[i])
1814 goto invalid_resize_inode;
1815 }
1816 credits += 3;
1817 }
1818
1819 handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits);
1820 if (IS_ERR(handle))
1821 return PTR_ERR(handle);
1822
1823 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1824 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1825 if (err)
1826 goto errout;
1827
1828 EXT4_CLEAR_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE);
1829 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
1830 sbi->s_es->s_first_meta_bg =
1831 cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count));
1832
1833 err = ext4_handle_dirty_super(handle, sb);
1834 if (err) {
1835 ext4_std_error(sb, err);
1836 goto errout;
1837 }
1838
1839 if (inode) {
1840 nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]);
1841 ext4_free_blocks(handle, inode, NULL, nr, 1,
1842 EXT4_FREE_BLOCKS_METADATA |
1843 EXT4_FREE_BLOCKS_FORGET);
1844 ei->i_data[EXT4_DIND_BLOCK] = 0;
1845 inode->i_blocks = 0;
1846
1847 err = ext4_mark_inode_dirty(handle, inode);
1848 if (err)
1849 ext4_std_error(sb, err);
1850 }
1851
1852errout:
1853 ret = ext4_journal_stop(handle);
1854 if (!err)
1855 err = ret;
1856 return ret;
1857
1858invalid_resize_inode:
1859 ext4_error(sb, "corrupted/inconsistent resize inode");
1860 return -EINVAL;
1861}
1862
1863
1864
1865
1866
1867
1868
1869int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
1870{
1871 struct ext4_new_flex_group_data *flex_gd = NULL;
1872 struct ext4_sb_info *sbi = EXT4_SB(sb);
1873 struct ext4_super_block *es = sbi->s_es;
1874 struct buffer_head *bh;
1875 struct inode *resize_inode = NULL;
1876 ext4_grpblk_t add, offset;
1877 unsigned long n_desc_blocks;
1878 unsigned long o_desc_blocks;
1879 ext4_group_t o_group;
1880 ext4_group_t n_group;
1881 ext4_fsblk_t o_blocks_count;
1882 ext4_fsblk_t n_blocks_count_retry = 0;
1883 unsigned long last_update_time = 0;
1884 int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
1885 int meta_bg;
1886
1887
1888 bh = sb_bread(sb, n_blocks_count - 1);
1889 if (!bh) {
1890 ext4_warning(sb, "can't read last block, resize aborted");
1891 return -ENOSPC;
1892 }
1893 brelse(bh);
1894
1895retry:
1896 o_blocks_count = ext4_blocks_count(es);
1897
1898 ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu "
1899 "to %llu blocks", o_blocks_count, n_blocks_count);
1900
1901 if (n_blocks_count < o_blocks_count) {
1902
1903 ext4_warning(sb, "can't shrink FS - resize aborted");
1904 return -EINVAL;
1905 }
1906
1907 if (n_blocks_count == o_blocks_count)
1908
1909 return 0;
1910
1911 n_group = ext4_get_group_number(sb, n_blocks_count - 1);
1912 if (n_group > (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
1913 ext4_warning(sb, "resize would cause inodes_count overflow");
1914 return -EINVAL;
1915 }
1916 ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
1917
1918 n_desc_blocks = num_desc_blocks(sb, n_group + 1);
1919 o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count);
1920
1921 meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
1922
1923 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE)) {
1924 if (meta_bg) {
1925 ext4_error(sb, "resize_inode and meta_bg enabled "
1926 "simultaneously");
1927 return -EINVAL;
1928 }
1929 if (n_desc_blocks > o_desc_blocks +
1930 le16_to_cpu(es->s_reserved_gdt_blocks)) {
1931 n_blocks_count_retry = n_blocks_count;
1932 n_desc_blocks = o_desc_blocks +
1933 le16_to_cpu(es->s_reserved_gdt_blocks);
1934 n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);
1935 n_blocks_count = n_group * EXT4_BLOCKS_PER_GROUP(sb);
1936 n_group--;
1937 }
1938
1939 if (!resize_inode)
1940 resize_inode = ext4_iget(sb, EXT4_RESIZE_INO);
1941 if (IS_ERR(resize_inode)) {
1942 ext4_warning(sb, "Error opening resize inode");
1943 return PTR_ERR(resize_inode);
1944 }
1945 }
1946
1947 if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) {
1948 err = ext4_convert_meta_bg(sb, resize_inode);
1949 if (err)
1950 goto out;
1951 if (resize_inode) {
1952 iput(resize_inode);
1953 resize_inode = NULL;
1954 }
1955 if (n_blocks_count_retry) {
1956 n_blocks_count = n_blocks_count_retry;
1957 n_blocks_count_retry = 0;
1958 goto retry;
1959 }
1960 }
1961
1962
1963 if (n_group == o_group)
1964 add = n_blocks_count - o_blocks_count;
1965 else
1966 add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1);
1967 if (add > 0) {
1968 err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1969 if (err)
1970 goto out;
1971 }
1972
1973 if (ext4_blocks_count(es) == n_blocks_count)
1974 goto out;
1975
1976 err = ext4_alloc_flex_bg_array(sb, n_group + 1);
1977 if (err)
1978 return err;
1979
1980 err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
1981 if (err)
1982 goto out;
1983
1984 flex_gd = alloc_flex_gd(flexbg_size);
1985 if (flex_gd == NULL) {
1986 err = -ENOMEM;
1987 goto out;
1988 }
1989
1990
1991
1992
1993 while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
1994 flexbg_size)) {
1995 if (jiffies - last_update_time > HZ * 10) {
1996 if (last_update_time)
1997 ext4_msg(sb, KERN_INFO,
1998 "resized to %llu blocks",
1999 ext4_blocks_count(es));
2000 last_update_time = jiffies;
2001 }
2002 if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
2003 break;
2004 err = ext4_flex_group_add(sb, resize_inode, flex_gd);
2005 if (unlikely(err))
2006 break;
2007 }
2008
2009 if (!err && n_blocks_count_retry) {
2010 n_blocks_count = n_blocks_count_retry;
2011 n_blocks_count_retry = 0;
2012 free_flex_gd(flex_gd);
2013 flex_gd = NULL;
2014 goto retry;
2015 }
2016
2017out:
2018 if (flex_gd)
2019 free_flex_gd(flex_gd);
2020 if (resize_inode != NULL)
2021 iput(resize_inode);
2022 ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count);
2023 return err;
2024}
2025