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15#include <linux/slab.h>
16#include "ext4_jbd2.h"
17#include "ext4_extents.h"
18
19
20
21
22
23struct migrate_struct {
24 ext4_lblk_t first_block, last_block, curr_block;
25 ext4_fsblk_t first_pblock, last_pblock;
26};
27
28static int finish_range(handle_t *handle, struct inode *inode,
29 struct migrate_struct *lb)
30
31{
32 int retval = 0, needed;
33 struct ext4_extent newext;
34 struct ext4_ext_path *path;
35 if (lb->first_pblock == 0)
36 return 0;
37
38
39 newext.ee_block = cpu_to_le32(lb->first_block);
40 newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
41 ext4_ext_store_pblock(&newext, lb->first_pblock);
42
43 down_write(&EXT4_I(inode)->i_data_sem);
44 path = ext4_find_extent(inode, lb->first_block, NULL, 0);
45 if (IS_ERR(path)) {
46 retval = PTR_ERR(path);
47 path = NULL;
48 goto err_out;
49 }
50
51
52
53
54
55
56
57 needed = ext4_ext_calc_credits_for_single_extent(inode,
58 lb->last_block - lb->first_block + 1, path);
59
60
61
62
63 if (needed && ext4_handle_has_enough_credits(handle,
64 EXT4_RESERVE_TRANS_BLOCKS)) {
65 up_write((&EXT4_I(inode)->i_data_sem));
66 retval = ext4_journal_restart(handle, needed);
67 down_write((&EXT4_I(inode)->i_data_sem));
68 if (retval)
69 goto err_out;
70 } else if (needed) {
71 retval = ext4_journal_extend(handle, needed);
72 if (retval) {
73
74
75
76 up_write((&EXT4_I(inode)->i_data_sem));
77 retval = ext4_journal_restart(handle, needed);
78 down_write((&EXT4_I(inode)->i_data_sem));
79 if (retval)
80 goto err_out;
81 }
82 }
83 retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0);
84err_out:
85 up_write((&EXT4_I(inode)->i_data_sem));
86 ext4_ext_drop_refs(path);
87 kfree(path);
88 lb->first_pblock = 0;
89 return retval;
90}
91
92static int update_extent_range(handle_t *handle, struct inode *inode,
93 ext4_fsblk_t pblock, struct migrate_struct *lb)
94{
95 int retval;
96
97
98
99 if (lb->first_pblock &&
100 (lb->last_pblock+1 == pblock) &&
101 (lb->last_block+1 == lb->curr_block)) {
102 lb->last_pblock = pblock;
103 lb->last_block = lb->curr_block;
104 lb->curr_block++;
105 return 0;
106 }
107
108
109
110 retval = finish_range(handle, inode, lb);
111 lb->first_pblock = lb->last_pblock = pblock;
112 lb->first_block = lb->last_block = lb->curr_block;
113 lb->curr_block++;
114 return retval;
115}
116
117static int update_ind_extent_range(handle_t *handle, struct inode *inode,
118 ext4_fsblk_t pblock,
119 struct migrate_struct *lb)
120{
121 struct buffer_head *bh;
122 __le32 *i_data;
123 int i, retval = 0;
124 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
125
126 bh = sb_bread(inode->i_sb, pblock);
127 if (!bh)
128 return -EIO;
129
130 i_data = (__le32 *)bh->b_data;
131 for (i = 0; i < max_entries; i++) {
132 if (i_data[i]) {
133 retval = update_extent_range(handle, inode,
134 le32_to_cpu(i_data[i]), lb);
135 if (retval)
136 break;
137 } else {
138 lb->curr_block++;
139 }
140 }
141 put_bh(bh);
142 return retval;
143
144}
145
146static int update_dind_extent_range(handle_t *handle, struct inode *inode,
147 ext4_fsblk_t pblock,
148 struct migrate_struct *lb)
149{
150 struct buffer_head *bh;
151 __le32 *i_data;
152 int i, retval = 0;
153 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
154
155 bh = sb_bread(inode->i_sb, pblock);
156 if (!bh)
157 return -EIO;
158
159 i_data = (__le32 *)bh->b_data;
160 for (i = 0; i < max_entries; i++) {
161 if (i_data[i]) {
162 retval = update_ind_extent_range(handle, inode,
163 le32_to_cpu(i_data[i]), lb);
164 if (retval)
165 break;
166 } else {
167
168 lb->curr_block += max_entries;
169 }
170 }
171 put_bh(bh);
172 return retval;
173
174}
175
176static int update_tind_extent_range(handle_t *handle, struct inode *inode,
177 ext4_fsblk_t pblock,
178 struct migrate_struct *lb)
179{
180 struct buffer_head *bh;
181 __le32 *i_data;
182 int i, retval = 0;
183 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
184
185 bh = sb_bread(inode->i_sb, pblock);
186 if (!bh)
187 return -EIO;
188
189 i_data = (__le32 *)bh->b_data;
190 for (i = 0; i < max_entries; i++) {
191 if (i_data[i]) {
192 retval = update_dind_extent_range(handle, inode,
193 le32_to_cpu(i_data[i]), lb);
194 if (retval)
195 break;
196 } else {
197
198 lb->curr_block += max_entries * max_entries;
199 }
200 }
201 put_bh(bh);
202 return retval;
203
204}
205
206static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
207{
208 int retval = 0, needed;
209
210 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
211 return 0;
212
213
214
215
216
217
218 needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
219
220 if (ext4_journal_extend(handle, needed) != 0)
221 retval = ext4_journal_restart(handle, needed);
222
223 return retval;
224}
225
226static int free_dind_blocks(handle_t *handle,
227 struct inode *inode, __le32 i_data)
228{
229 int i;
230 __le32 *tmp_idata;
231 struct buffer_head *bh;
232 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
233
234 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
235 if (!bh)
236 return -EIO;
237
238 tmp_idata = (__le32 *)bh->b_data;
239 for (i = 0; i < max_entries; i++) {
240 if (tmp_idata[i]) {
241 extend_credit_for_blkdel(handle, inode);
242 ext4_free_blocks(handle, inode, NULL,
243 le32_to_cpu(tmp_idata[i]), 1,
244 EXT4_FREE_BLOCKS_METADATA |
245 EXT4_FREE_BLOCKS_FORGET);
246 }
247 }
248 put_bh(bh);
249 extend_credit_for_blkdel(handle, inode);
250 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
251 EXT4_FREE_BLOCKS_METADATA |
252 EXT4_FREE_BLOCKS_FORGET);
253 return 0;
254}
255
256static int free_tind_blocks(handle_t *handle,
257 struct inode *inode, __le32 i_data)
258{
259 int i, retval = 0;
260 __le32 *tmp_idata;
261 struct buffer_head *bh;
262 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
263
264 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
265 if (!bh)
266 return -EIO;
267
268 tmp_idata = (__le32 *)bh->b_data;
269 for (i = 0; i < max_entries; i++) {
270 if (tmp_idata[i]) {
271 retval = free_dind_blocks(handle,
272 inode, tmp_idata[i]);
273 if (retval) {
274 put_bh(bh);
275 return retval;
276 }
277 }
278 }
279 put_bh(bh);
280 extend_credit_for_blkdel(handle, inode);
281 ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
282 EXT4_FREE_BLOCKS_METADATA |
283 EXT4_FREE_BLOCKS_FORGET);
284 return 0;
285}
286
287static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
288{
289 int retval;
290
291
292 if (i_data[0]) {
293 extend_credit_for_blkdel(handle, inode);
294 ext4_free_blocks(handle, inode, NULL,
295 le32_to_cpu(i_data[0]), 1,
296 EXT4_FREE_BLOCKS_METADATA |
297 EXT4_FREE_BLOCKS_FORGET);
298 }
299
300
301 if (i_data[1]) {
302 retval = free_dind_blocks(handle, inode, i_data[1]);
303 if (retval)
304 return retval;
305 }
306
307
308 if (i_data[2]) {
309 retval = free_tind_blocks(handle, inode, i_data[2]);
310 if (retval)
311 return retval;
312 }
313 return 0;
314}
315
316static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
317 struct inode *tmp_inode)
318{
319 int retval;
320 __le32 i_data[3];
321 struct ext4_inode_info *ei = EXT4_I(inode);
322 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
323
324
325
326
327
328 retval = ext4_journal_extend(handle, 1);
329 if (retval) {
330 retval = ext4_journal_restart(handle, 1);
331 if (retval)
332 goto err_out;
333 }
334
335 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
336 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
337 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
338
339 down_write(&EXT4_I(inode)->i_data_sem);
340
341
342
343
344
345 if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
346 retval = -EAGAIN;
347 up_write(&EXT4_I(inode)->i_data_sem);
348 goto err_out;
349 } else
350 ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
351
352
353
354
355 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
356 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
357
358
359
360
361
362
363
364
365
366
367 spin_lock(&inode->i_lock);
368 inode->i_blocks += tmp_inode->i_blocks;
369 spin_unlock(&inode->i_lock);
370 up_write(&EXT4_I(inode)->i_data_sem);
371
372
373
374
375
376 retval = free_ind_block(handle, inode, i_data);
377 ext4_mark_inode_dirty(handle, inode);
378
379err_out:
380 return retval;
381}
382
383static int free_ext_idx(handle_t *handle, struct inode *inode,
384 struct ext4_extent_idx *ix)
385{
386 int i, retval = 0;
387 ext4_fsblk_t block;
388 struct buffer_head *bh;
389 struct ext4_extent_header *eh;
390
391 block = ext4_idx_pblock(ix);
392 bh = sb_bread(inode->i_sb, block);
393 if (!bh)
394 return -EIO;
395
396 eh = (struct ext4_extent_header *)bh->b_data;
397 if (eh->eh_depth != 0) {
398 ix = EXT_FIRST_INDEX(eh);
399 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
400 retval = free_ext_idx(handle, inode, ix);
401 if (retval)
402 break;
403 }
404 }
405 put_bh(bh);
406 extend_credit_for_blkdel(handle, inode);
407 ext4_free_blocks(handle, inode, NULL, block, 1,
408 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
409 return retval;
410}
411
412
413
414
415static int free_ext_block(handle_t *handle, struct inode *inode)
416{
417 int i, retval = 0;
418 struct ext4_inode_info *ei = EXT4_I(inode);
419 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
420 struct ext4_extent_idx *ix;
421 if (eh->eh_depth == 0)
422
423
424
425 return 0;
426 ix = EXT_FIRST_INDEX(eh);
427 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
428 retval = free_ext_idx(handle, inode, ix);
429 if (retval)
430 return retval;
431 }
432 return retval;
433}
434
435int ext4_ext_migrate(struct inode *inode)
436{
437 handle_t *handle;
438 int retval = 0, i;
439 __le32 *i_data;
440 struct ext4_inode_info *ei;
441 struct inode *tmp_inode = NULL;
442 struct migrate_struct lb;
443 unsigned long max_entries;
444 __u32 goal;
445 uid_t owner[2];
446
447
448
449
450
451 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
452 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
453 (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
454 return -EINVAL;
455
456 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
457
458
459
460 return retval;
461
462
463
464
465
466
467 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
468 4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
469
470 if (IS_ERR(handle)) {
471 retval = PTR_ERR(handle);
472 return retval;
473 }
474 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
475 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
476 owner[0] = i_uid_read(inode);
477 owner[1] = i_gid_read(inode);
478 tmp_inode = ext4_new_inode(handle, d_inode(inode->i_sb->s_root),
479 S_IFREG, NULL, goal, owner);
480 if (IS_ERR(tmp_inode)) {
481 retval = PTR_ERR(tmp_inode);
482 ext4_journal_stop(handle);
483 return retval;
484 }
485 i_size_write(tmp_inode, i_size_read(inode));
486
487
488
489
490 clear_nlink(tmp_inode);
491
492 ext4_ext_tree_init(handle, tmp_inode);
493 ext4_orphan_add(handle, tmp_inode);
494 ext4_journal_stop(handle);
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512 down_read(&EXT4_I(inode)->i_data_sem);
513 ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
514 up_read((&EXT4_I(inode)->i_data_sem));
515
516 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
517 if (IS_ERR(handle)) {
518
519
520
521
522
523 ext4_orphan_del(NULL, tmp_inode);
524 retval = PTR_ERR(handle);
525 goto out;
526 }
527
528 ei = EXT4_I(inode);
529 i_data = ei->i_data;
530 memset(&lb, 0, sizeof(lb));
531
532
533 max_entries = inode->i_sb->s_blocksize >> 2;
534 for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
535 if (i_data[i]) {
536 retval = update_extent_range(handle, tmp_inode,
537 le32_to_cpu(i_data[i]), &lb);
538 if (retval)
539 goto err_out;
540 } else
541 lb.curr_block++;
542 }
543 if (i_data[EXT4_IND_BLOCK]) {
544 retval = update_ind_extent_range(handle, tmp_inode,
545 le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
546 if (retval)
547 goto err_out;
548 } else
549 lb.curr_block += max_entries;
550 if (i_data[EXT4_DIND_BLOCK]) {
551 retval = update_dind_extent_range(handle, tmp_inode,
552 le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
553 if (retval)
554 goto err_out;
555 } else
556 lb.curr_block += max_entries * max_entries;
557 if (i_data[EXT4_TIND_BLOCK]) {
558 retval = update_tind_extent_range(handle, tmp_inode,
559 le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
560 if (retval)
561 goto err_out;
562 }
563
564
565
566 retval = finish_range(handle, tmp_inode, &lb);
567err_out:
568 if (retval)
569
570
571
572
573 free_ext_block(handle, tmp_inode);
574 else {
575 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
576 if (retval)
577
578
579
580
581 free_ext_block(handle, tmp_inode);
582 }
583
584
585 if (ext4_journal_extend(handle, 1) != 0)
586 ext4_journal_restart(handle, 1);
587
588
589
590
591 i_size_write(tmp_inode, 0);
592
593
594
595
596
597
598
599
600
601 tmp_inode->i_blocks = 0;
602
603
604 ext4_ext_tree_init(handle, tmp_inode);
605 ext4_journal_stop(handle);
606out:
607 unlock_new_inode(tmp_inode);
608 iput(tmp_inode);
609
610 return retval;
611}
612
613
614
615
616int ext4_ind_migrate(struct inode *inode)
617{
618 struct ext4_extent_header *eh;
619 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
620 struct ext4_inode_info *ei = EXT4_I(inode);
621 struct ext4_extent *ex;
622 unsigned int i, len;
623 ext4_fsblk_t blk;
624 handle_t *handle;
625 int ret;
626
627 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
628 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
629 (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
630 return -EINVAL;
631
632 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
633 EXT4_FEATURE_RO_COMPAT_BIGALLOC))
634 return -EOPNOTSUPP;
635
636 handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
637 if (IS_ERR(handle))
638 return PTR_ERR(handle);
639
640 down_write(&EXT4_I(inode)->i_data_sem);
641 ret = ext4_ext_check_inode(inode);
642 if (ret)
643 goto errout;
644
645 eh = ext_inode_hdr(inode);
646 ex = EXT_FIRST_EXTENT(eh);
647 if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
648 eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
649 ret = -EOPNOTSUPP;
650 goto errout;
651 }
652 if (eh->eh_entries == 0)
653 blk = len = 0;
654 else {
655 len = le16_to_cpu(ex->ee_len);
656 blk = ext4_ext_pblock(ex);
657 if (len > EXT4_NDIR_BLOCKS) {
658 ret = -EOPNOTSUPP;
659 goto errout;
660 }
661 }
662
663 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
664 memset(ei->i_data, 0, sizeof(ei->i_data));
665 for (i=0; i < len; i++)
666 ei->i_data[i] = cpu_to_le32(blk++);
667 ext4_mark_inode_dirty(handle, inode);
668errout:
669 ext4_journal_stop(handle);
670 up_write(&EXT4_I(inode)->i_data_sem);
671 return ret;
672}
673