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15#include <linux/module.h>
16#include <linux/slab.h>
17#include "ext4_jbd2.h"
18#include "ext4_extents.h"
19
20
21
22
23
24struct list_blocks_struct {
25 ext4_lblk_t first_block, last_block;
26 ext4_fsblk_t first_pblock, last_pblock;
27};
28
29static int finish_range(handle_t *handle, struct inode *inode,
30 struct list_blocks_struct *lb)
31
32{
33 int retval = 0, needed;
34 struct ext4_extent newext;
35 struct ext4_ext_path *path;
36 if (lb->first_pblock == 0)
37 return 0;
38
39
40 newext.ee_block = cpu_to_le32(lb->first_block);
41 newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
42 ext4_ext_store_pblock(&newext, lb->first_pblock);
43 path = ext4_ext_find_extent(inode, lb->first_block, NULL);
44
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 retval = ext4_journal_restart(handle, needed);
66 if (retval)
67 goto err_out;
68 } else if (needed) {
69 retval = ext4_journal_extend(handle, needed);
70 if (retval) {
71
72
73
74 retval = ext4_journal_restart(handle, needed);
75 if (retval)
76 goto err_out;
77 }
78 }
79 retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
80err_out:
81 if (path) {
82 ext4_ext_drop_refs(path);
83 kfree(path);
84 }
85 lb->first_pblock = 0;
86 return retval;
87}
88
89static int update_extent_range(handle_t *handle, struct inode *inode,
90 ext4_fsblk_t pblock, ext4_lblk_t blk_num,
91 struct list_blocks_struct *lb)
92{
93 int retval;
94
95
96
97 if (lb->first_pblock &&
98 (lb->last_pblock+1 == pblock) &&
99 (lb->last_block+1 == blk_num)) {
100 lb->last_pblock = pblock;
101 lb->last_block = blk_num;
102 return 0;
103 }
104
105
106
107 retval = finish_range(handle, inode, lb);
108 lb->first_pblock = lb->last_pblock = pblock;
109 lb->first_block = lb->last_block = blk_num;
110
111 return retval;
112}
113
114static int update_ind_extent_range(handle_t *handle, struct inode *inode,
115 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
116 struct list_blocks_struct *lb)
117{
118 struct buffer_head *bh;
119 __le32 *i_data;
120 int i, retval = 0;
121 ext4_lblk_t blk_count = *blk_nump;
122 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
123
124 if (!pblock) {
125
126 *blk_nump += max_entries;
127 return 0;
128 }
129
130 bh = sb_bread(inode->i_sb, pblock);
131 if (!bh)
132 return -EIO;
133
134 i_data = (__le32 *)bh->b_data;
135 for (i = 0; i < max_entries; i++, blk_count++) {
136 if (i_data[i]) {
137 retval = update_extent_range(handle, inode,
138 le32_to_cpu(i_data[i]),
139 blk_count, lb);
140 if (retval)
141 break;
142 }
143 }
144
145
146 *blk_nump = blk_count;
147 put_bh(bh);
148 return retval;
149
150}
151
152static int update_dind_extent_range(handle_t *handle, struct inode *inode,
153 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
154 struct list_blocks_struct *lb)
155{
156 struct buffer_head *bh;
157 __le32 *i_data;
158 int i, retval = 0;
159 ext4_lblk_t blk_count = *blk_nump;
160 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
161
162 if (!pblock) {
163
164 *blk_nump += max_entries * max_entries;
165 return 0;
166 }
167 bh = sb_bread(inode->i_sb, pblock);
168 if (!bh)
169 return -EIO;
170
171 i_data = (__le32 *)bh->b_data;
172 for (i = 0; i < max_entries; i++) {
173 if (i_data[i]) {
174 retval = update_ind_extent_range(handle, inode,
175 le32_to_cpu(i_data[i]),
176 &blk_count, lb);
177 if (retval)
178 break;
179 } else {
180
181 blk_count += max_entries;
182 }
183 }
184
185
186 *blk_nump = blk_count;
187 put_bh(bh);
188 return retval;
189
190}
191
192static int update_tind_extent_range(handle_t *handle, struct inode *inode,
193 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
194 struct list_blocks_struct *lb)
195{
196 struct buffer_head *bh;
197 __le32 *i_data;
198 int i, retval = 0;
199 ext4_lblk_t blk_count = *blk_nump;
200 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
201
202 if (!pblock) {
203
204 *blk_nump += max_entries * max_entries * max_entries;
205 return 0;
206 }
207 bh = sb_bread(inode->i_sb, pblock);
208 if (!bh)
209 return -EIO;
210
211 i_data = (__le32 *)bh->b_data;
212 for (i = 0; i < max_entries; i++) {
213 if (i_data[i]) {
214 retval = update_dind_extent_range(handle, inode,
215 le32_to_cpu(i_data[i]),
216 &blk_count, lb);
217 if (retval)
218 break;
219 } else
220
221 blk_count += max_entries * max_entries;
222 }
223
224 *blk_nump = blk_count;
225 put_bh(bh);
226 return retval;
227
228}
229
230static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
231{
232 int retval = 0, needed;
233
234 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
235 return 0;
236
237
238
239
240
241
242 needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
243
244 if (ext4_journal_extend(handle, needed) != 0)
245 retval = ext4_journal_restart(handle, needed);
246
247 return retval;
248}
249
250static int free_dind_blocks(handle_t *handle,
251 struct inode *inode, __le32 i_data)
252{
253 int i;
254 __le32 *tmp_idata;
255 struct buffer_head *bh;
256 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
257
258 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
259 if (!bh)
260 return -EIO;
261
262 tmp_idata = (__le32 *)bh->b_data;
263 for (i = 0; i < max_entries; i++) {
264 if (tmp_idata[i]) {
265 extend_credit_for_blkdel(handle, inode);
266 ext4_free_blocks(handle, inode, 0,
267 le32_to_cpu(tmp_idata[i]), 1,
268 EXT4_FREE_BLOCKS_METADATA |
269 EXT4_FREE_BLOCKS_FORGET);
270 }
271 }
272 put_bh(bh);
273 extend_credit_for_blkdel(handle, inode);
274 ext4_free_blocks(handle, inode, 0, le32_to_cpu(i_data), 1,
275 EXT4_FREE_BLOCKS_METADATA |
276 EXT4_FREE_BLOCKS_FORGET);
277 return 0;
278}
279
280static int free_tind_blocks(handle_t *handle,
281 struct inode *inode, __le32 i_data)
282{
283 int i, retval = 0;
284 __le32 *tmp_idata;
285 struct buffer_head *bh;
286 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
287
288 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
289 if (!bh)
290 return -EIO;
291
292 tmp_idata = (__le32 *)bh->b_data;
293 for (i = 0; i < max_entries; i++) {
294 if (tmp_idata[i]) {
295 retval = free_dind_blocks(handle,
296 inode, tmp_idata[i]);
297 if (retval) {
298 put_bh(bh);
299 return retval;
300 }
301 }
302 }
303 put_bh(bh);
304 extend_credit_for_blkdel(handle, inode);
305 ext4_free_blocks(handle, inode, 0, le32_to_cpu(i_data), 1,
306 EXT4_FREE_BLOCKS_METADATA |
307 EXT4_FREE_BLOCKS_FORGET);
308 return 0;
309}
310
311static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
312{
313 int retval;
314
315
316 if (i_data[0]) {
317 extend_credit_for_blkdel(handle, inode);
318 ext4_free_blocks(handle, inode, 0,
319 le32_to_cpu(i_data[0]), 1,
320 EXT4_FREE_BLOCKS_METADATA |
321 EXT4_FREE_BLOCKS_FORGET);
322 }
323
324
325 if (i_data[1]) {
326 retval = free_dind_blocks(handle, inode, i_data[1]);
327 if (retval)
328 return retval;
329 }
330
331
332 if (i_data[2]) {
333 retval = free_tind_blocks(handle, inode, i_data[2]);
334 if (retval)
335 return retval;
336 }
337 return 0;
338}
339
340static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
341 struct inode *tmp_inode)
342{
343 int retval;
344 __le32 i_data[3];
345 struct ext4_inode_info *ei = EXT4_I(inode);
346 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
347
348
349
350
351
352 retval = ext4_journal_extend(handle, 1);
353 if (retval) {
354 retval = ext4_journal_restart(handle, 1);
355 if (retval)
356 goto err_out;
357 }
358
359 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
360 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
361 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
362
363 down_write(&EXT4_I(inode)->i_data_sem);
364
365
366
367
368
369 if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
370 retval = -EAGAIN;
371 up_write(&EXT4_I(inode)->i_data_sem);
372 goto err_out;
373 } else
374 ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
375
376
377
378
379 ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS);
380 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
381
382
383
384
385
386
387
388
389
390
391 spin_lock(&inode->i_lock);
392 inode->i_blocks += tmp_inode->i_blocks;
393 spin_unlock(&inode->i_lock);
394 up_write(&EXT4_I(inode)->i_data_sem);
395
396
397
398
399
400 retval = free_ind_block(handle, inode, i_data);
401 ext4_mark_inode_dirty(handle, inode);
402
403err_out:
404 return retval;
405}
406
407static int free_ext_idx(handle_t *handle, struct inode *inode,
408 struct ext4_extent_idx *ix)
409{
410 int i, retval = 0;
411 ext4_fsblk_t block;
412 struct buffer_head *bh;
413 struct ext4_extent_header *eh;
414
415 block = ext4_idx_pblock(ix);
416 bh = sb_bread(inode->i_sb, block);
417 if (!bh)
418 return -EIO;
419
420 eh = (struct ext4_extent_header *)bh->b_data;
421 if (eh->eh_depth != 0) {
422 ix = EXT_FIRST_INDEX(eh);
423 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
424 retval = free_ext_idx(handle, inode, ix);
425 if (retval)
426 break;
427 }
428 }
429 put_bh(bh);
430 extend_credit_for_blkdel(handle, inode);
431 ext4_free_blocks(handle, inode, 0, block, 1,
432 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
433 return retval;
434}
435
436
437
438
439static int free_ext_block(handle_t *handle, struct inode *inode)
440{
441 int i, retval = 0;
442 struct ext4_inode_info *ei = EXT4_I(inode);
443 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
444 struct ext4_extent_idx *ix;
445 if (eh->eh_depth == 0)
446
447
448
449 return 0;
450 ix = EXT_FIRST_INDEX(eh);
451 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
452 retval = free_ext_idx(handle, inode, ix);
453 if (retval)
454 return retval;
455 }
456 return retval;
457
458}
459
460int ext4_ext_migrate(struct inode *inode)
461{
462 handle_t *handle;
463 int retval = 0, i;
464 __le32 *i_data;
465 ext4_lblk_t blk_count = 0;
466 struct ext4_inode_info *ei;
467 struct inode *tmp_inode = NULL;
468 struct list_blocks_struct lb;
469 unsigned long max_entries;
470 __u32 goal;
471
472
473
474
475
476 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
477 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
478 (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
479 return -EINVAL;
480
481 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
482
483
484
485 return retval;
486
487 handle = ext4_journal_start(inode,
488 EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
489 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
490 EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)
491 + 1);
492 if (IS_ERR(handle)) {
493 retval = PTR_ERR(handle);
494 return retval;
495 }
496 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
497 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
498 tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
499 S_IFREG, NULL, goal);
500 if (IS_ERR(tmp_inode)) {
501 retval = -ENOMEM;
502 ext4_journal_stop(handle);
503 return retval;
504 }
505 i_size_write(tmp_inode, i_size_read(inode));
506
507
508
509
510 tmp_inode->i_nlink = 0;
511
512 ext4_ext_tree_init(handle, tmp_inode);
513 ext4_orphan_add(handle, tmp_inode);
514 ext4_journal_stop(handle);
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532 down_read((&EXT4_I(inode)->i_data_sem));
533 ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
534 up_read((&EXT4_I(inode)->i_data_sem));
535
536 handle = ext4_journal_start(inode, 1);
537 if (IS_ERR(handle)) {
538
539
540
541
542
543 ext4_orphan_del(NULL, tmp_inode);
544 retval = PTR_ERR(handle);
545 goto out;
546 }
547
548 ei = EXT4_I(inode);
549 i_data = ei->i_data;
550 memset(&lb, 0, sizeof(lb));
551
552
553 max_entries = inode->i_sb->s_blocksize >> 2;
554 for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
555 if (i_data[i]) {
556 retval = update_extent_range(handle, tmp_inode,
557 le32_to_cpu(i_data[i]),
558 blk_count, &lb);
559 if (retval)
560 goto err_out;
561 }
562 }
563 if (i_data[EXT4_IND_BLOCK]) {
564 retval = update_ind_extent_range(handle, tmp_inode,
565 le32_to_cpu(i_data[EXT4_IND_BLOCK]),
566 &blk_count, &lb);
567 if (retval)
568 goto err_out;
569 } else
570 blk_count += max_entries;
571 if (i_data[EXT4_DIND_BLOCK]) {
572 retval = update_dind_extent_range(handle, tmp_inode,
573 le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
574 &blk_count, &lb);
575 if (retval)
576 goto err_out;
577 } else
578 blk_count += max_entries * max_entries;
579 if (i_data[EXT4_TIND_BLOCK]) {
580 retval = update_tind_extent_range(handle, tmp_inode,
581 le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
582 &blk_count, &lb);
583 if (retval)
584 goto err_out;
585 }
586
587
588
589 retval = finish_range(handle, tmp_inode, &lb);
590err_out:
591 if (retval)
592
593
594
595
596 free_ext_block(handle, tmp_inode);
597 else {
598 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
599 if (retval)
600
601
602
603
604 free_ext_block(handle, tmp_inode);
605 }
606
607
608 if (ext4_journal_extend(handle, 1) != 0)
609 ext4_journal_restart(handle, 1);
610
611
612
613
614 i_size_write(tmp_inode, 0);
615
616
617
618
619
620
621
622
623
624 tmp_inode->i_blocks = 0;
625
626
627 ext4_ext_tree_init(handle, tmp_inode);
628 ext4_journal_stop(handle);
629out:
630 unlock_new_inode(tmp_inode);
631 iput(tmp_inode);
632
633 return retval;
634}
635