Line data Source code
1 : // SPDX-License-Identifier: LGPL-2.1
2 : /*
3 : * Copyright IBM Corporation, 2007
4 : * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
5 : *
6 : */
7 :
8 : #include <linux/slab.h>
9 : #include "ext4_jbd2.h"
10 : #include "ext4_extents.h"
11 :
12 : /*
13 : * The contiguous blocks details which can be
14 : * represented by a single extent
15 : */
16 : struct migrate_struct {
17 : ext4_lblk_t first_block, last_block, curr_block;
18 : ext4_fsblk_t first_pblock, last_pblock;
19 : };
20 :
21 0 : static int finish_range(handle_t *handle, struct inode *inode,
22 : struct migrate_struct *lb)
23 :
24 : {
25 0 : int retval = 0, needed;
26 0 : struct ext4_extent newext;
27 0 : struct ext4_ext_path *path;
28 0 : if (lb->first_pblock == 0)
29 : return 0;
30 :
31 : /* Add the extent to temp inode*/
32 0 : newext.ee_block = cpu_to_le32(lb->first_block);
33 0 : newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
34 0 : ext4_ext_store_pblock(&newext, lb->first_pblock);
35 : /* Locking only for convenience since we are operating on temp inode */
36 0 : down_write(&EXT4_I(inode)->i_data_sem);
37 0 : path = ext4_find_extent(inode, lb->first_block, NULL, 0);
38 0 : if (IS_ERR(path)) {
39 0 : retval = PTR_ERR(path);
40 0 : path = NULL;
41 0 : goto err_out;
42 : }
43 :
44 : /*
45 : * Calculate the credit needed to inserting this extent
46 : * Since we are doing this in loop we may accumulate extra
47 : * credit. But below we try to not accumulate too much
48 : * of them by restarting the journal.
49 : */
50 0 : needed = ext4_ext_calc_credits_for_single_extent(inode,
51 0 : lb->last_block - lb->first_block + 1, path);
52 :
53 0 : retval = ext4_datasem_ensure_credits(handle, inode, needed, needed, 0);
54 0 : if (retval < 0)
55 0 : goto err_out;
56 0 : retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0);
57 0 : err_out:
58 0 : up_write((&EXT4_I(inode)->i_data_sem));
59 0 : ext4_free_ext_path(path);
60 0 : lb->first_pblock = 0;
61 0 : return retval;
62 : }
63 :
64 0 : static int update_extent_range(handle_t *handle, struct inode *inode,
65 : ext4_fsblk_t pblock, struct migrate_struct *lb)
66 : {
67 0 : int retval;
68 : /*
69 : * See if we can add on to the existing range (if it exists)
70 : */
71 0 : if (lb->first_pblock &&
72 0 : (lb->last_pblock+1 == pblock) &&
73 0 : (lb->last_block+1 == lb->curr_block)) {
74 0 : lb->last_pblock = pblock;
75 0 : lb->last_block = lb->curr_block;
76 0 : lb->curr_block++;
77 0 : return 0;
78 : }
79 : /*
80 : * Start a new range.
81 : */
82 0 : retval = finish_range(handle, inode, lb);
83 0 : lb->first_pblock = lb->last_pblock = pblock;
84 0 : lb->first_block = lb->last_block = lb->curr_block;
85 0 : lb->curr_block++;
86 0 : return retval;
87 : }
88 :
89 0 : static int update_ind_extent_range(handle_t *handle, struct inode *inode,
90 : ext4_fsblk_t pblock,
91 : struct migrate_struct *lb)
92 : {
93 0 : struct buffer_head *bh;
94 0 : __le32 *i_data;
95 0 : int i, retval = 0;
96 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
97 :
98 0 : bh = ext4_sb_bread(inode->i_sb, pblock, 0);
99 0 : if (IS_ERR(bh))
100 0 : return PTR_ERR(bh);
101 :
102 0 : i_data = (__le32 *)bh->b_data;
103 0 : for (i = 0; i < max_entries; i++) {
104 0 : if (i_data[i]) {
105 0 : retval = update_extent_range(handle, inode,
106 : le32_to_cpu(i_data[i]), lb);
107 0 : if (retval)
108 : break;
109 : } else {
110 0 : lb->curr_block++;
111 : }
112 : }
113 0 : put_bh(bh);
114 0 : return retval;
115 :
116 : }
117 :
118 0 : static int update_dind_extent_range(handle_t *handle, struct inode *inode,
119 : ext4_fsblk_t pblock,
120 : struct migrate_struct *lb)
121 : {
122 0 : struct buffer_head *bh;
123 0 : __le32 *i_data;
124 0 : int i, retval = 0;
125 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
126 :
127 0 : bh = ext4_sb_bread(inode->i_sb, pblock, 0);
128 0 : if (IS_ERR(bh))
129 0 : return PTR_ERR(bh);
130 :
131 0 : i_data = (__le32 *)bh->b_data;
132 0 : for (i = 0; i < max_entries; i++) {
133 0 : if (i_data[i]) {
134 0 : retval = update_ind_extent_range(handle, inode,
135 : le32_to_cpu(i_data[i]), lb);
136 0 : if (retval)
137 : break;
138 : } else {
139 : /* Only update the file block number */
140 0 : lb->curr_block += max_entries;
141 : }
142 : }
143 0 : put_bh(bh);
144 0 : return retval;
145 :
146 : }
147 :
148 0 : static int update_tind_extent_range(handle_t *handle, struct inode *inode,
149 : ext4_fsblk_t pblock,
150 : struct migrate_struct *lb)
151 : {
152 0 : struct buffer_head *bh;
153 0 : __le32 *i_data;
154 0 : int i, retval = 0;
155 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
156 :
157 0 : bh = ext4_sb_bread(inode->i_sb, pblock, 0);
158 0 : if (IS_ERR(bh))
159 0 : return PTR_ERR(bh);
160 :
161 0 : i_data = (__le32 *)bh->b_data;
162 0 : for (i = 0; i < max_entries; i++) {
163 0 : if (i_data[i]) {
164 0 : retval = update_dind_extent_range(handle, inode,
165 : le32_to_cpu(i_data[i]), lb);
166 0 : if (retval)
167 : break;
168 : } else {
169 : /* Only update the file block number */
170 0 : lb->curr_block += max_entries * max_entries;
171 : }
172 : }
173 0 : put_bh(bh);
174 0 : return retval;
175 :
176 : }
177 :
178 0 : static int free_dind_blocks(handle_t *handle,
179 : struct inode *inode, __le32 i_data)
180 : {
181 0 : int i;
182 0 : __le32 *tmp_idata;
183 0 : struct buffer_head *bh;
184 0 : struct super_block *sb = inode->i_sb;
185 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
186 0 : int err;
187 :
188 0 : bh = ext4_sb_bread(sb, le32_to_cpu(i_data), 0);
189 0 : if (IS_ERR(bh))
190 0 : return PTR_ERR(bh);
191 :
192 0 : tmp_idata = (__le32 *)bh->b_data;
193 0 : for (i = 0; i < max_entries; i++) {
194 0 : if (tmp_idata[i]) {
195 0 : err = ext4_journal_ensure_credits(handle,
196 : EXT4_RESERVE_TRANS_BLOCKS,
197 : ext4_free_metadata_revoke_credits(sb, 1));
198 0 : if (err < 0) {
199 0 : put_bh(bh);
200 0 : return err;
201 : }
202 0 : ext4_free_blocks(handle, inode, NULL,
203 0 : le32_to_cpu(tmp_idata[i]), 1,
204 : EXT4_FREE_BLOCKS_METADATA |
205 : EXT4_FREE_BLOCKS_FORGET);
206 : }
207 : }
208 0 : put_bh(bh);
209 0 : err = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
210 : ext4_free_metadata_revoke_credits(sb, 1));
211 0 : if (err < 0)
212 : return err;
213 0 : ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
214 : EXT4_FREE_BLOCKS_METADATA |
215 : EXT4_FREE_BLOCKS_FORGET);
216 0 : return 0;
217 : }
218 :
219 0 : static int free_tind_blocks(handle_t *handle,
220 : struct inode *inode, __le32 i_data)
221 : {
222 0 : int i, retval = 0;
223 0 : __le32 *tmp_idata;
224 0 : struct buffer_head *bh;
225 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
226 :
227 0 : bh = ext4_sb_bread(inode->i_sb, le32_to_cpu(i_data), 0);
228 0 : if (IS_ERR(bh))
229 0 : return PTR_ERR(bh);
230 :
231 0 : tmp_idata = (__le32 *)bh->b_data;
232 0 : for (i = 0; i < max_entries; i++) {
233 0 : if (tmp_idata[i]) {
234 0 : retval = free_dind_blocks(handle,
235 : inode, tmp_idata[i]);
236 0 : if (retval) {
237 0 : put_bh(bh);
238 0 : return retval;
239 : }
240 : }
241 : }
242 0 : put_bh(bh);
243 0 : retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
244 : ext4_free_metadata_revoke_credits(inode->i_sb, 1));
245 0 : if (retval < 0)
246 : return retval;
247 0 : ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
248 : EXT4_FREE_BLOCKS_METADATA |
249 : EXT4_FREE_BLOCKS_FORGET);
250 0 : return 0;
251 : }
252 :
253 0 : static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
254 : {
255 0 : int retval;
256 :
257 : /* ei->i_data[EXT4_IND_BLOCK] */
258 0 : if (i_data[0]) {
259 0 : retval = ext4_journal_ensure_credits(handle,
260 : EXT4_RESERVE_TRANS_BLOCKS,
261 : ext4_free_metadata_revoke_credits(inode->i_sb, 1));
262 0 : if (retval < 0)
263 : return retval;
264 0 : ext4_free_blocks(handle, inode, NULL,
265 0 : le32_to_cpu(i_data[0]), 1,
266 : EXT4_FREE_BLOCKS_METADATA |
267 : EXT4_FREE_BLOCKS_FORGET);
268 : }
269 :
270 : /* ei->i_data[EXT4_DIND_BLOCK] */
271 0 : if (i_data[1]) {
272 0 : retval = free_dind_blocks(handle, inode, i_data[1]);
273 0 : if (retval)
274 : return retval;
275 : }
276 :
277 : /* ei->i_data[EXT4_TIND_BLOCK] */
278 0 : if (i_data[2]) {
279 0 : retval = free_tind_blocks(handle, inode, i_data[2]);
280 0 : if (retval)
281 0 : return retval;
282 : }
283 : return 0;
284 : }
285 :
286 0 : static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
287 : struct inode *tmp_inode)
288 : {
289 0 : int retval, retval2 = 0;
290 0 : __le32 i_data[3];
291 0 : struct ext4_inode_info *ei = EXT4_I(inode);
292 0 : struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
293 :
294 : /*
295 : * One credit accounted for writing the
296 : * i_data field of the original inode
297 : */
298 0 : retval = ext4_journal_ensure_credits(handle, 1, 0);
299 0 : if (retval < 0)
300 0 : goto err_out;
301 :
302 0 : i_data[0] = ei->i_data[EXT4_IND_BLOCK];
303 0 : i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
304 0 : i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
305 :
306 0 : down_write(&EXT4_I(inode)->i_data_sem);
307 : /*
308 : * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
309 : * happened after we started the migrate. We need to
310 : * fail the migrate
311 : */
312 0 : if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
313 0 : retval = -EAGAIN;
314 0 : up_write(&EXT4_I(inode)->i_data_sem);
315 0 : goto err_out;
316 : } else
317 0 : ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
318 : /*
319 : * We have the extent map build with the tmp inode.
320 : * Now copy the i_data across
321 : */
322 0 : ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
323 0 : memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
324 :
325 : /*
326 : * Update i_blocks with the new blocks that got
327 : * allocated while adding extents for extent index
328 : * blocks.
329 : *
330 : * While converting to extents we need not
331 : * update the original inode i_blocks for extent blocks
332 : * via quota APIs. The quota update happened via tmp_inode already.
333 : */
334 0 : spin_lock(&inode->i_lock);
335 0 : inode->i_blocks += tmp_inode->i_blocks;
336 0 : spin_unlock(&inode->i_lock);
337 0 : up_write(&EXT4_I(inode)->i_data_sem);
338 :
339 : /*
340 : * We mark the inode dirty after, because we decrement the
341 : * i_blocks when freeing the indirect meta-data blocks
342 : */
343 0 : retval = free_ind_block(handle, inode, i_data);
344 0 : retval2 = ext4_mark_inode_dirty(handle, inode);
345 0 : if (unlikely(retval2 && !retval))
346 0 : retval = retval2;
347 :
348 0 : err_out:
349 0 : return retval;
350 : }
351 :
352 0 : static int free_ext_idx(handle_t *handle, struct inode *inode,
353 : struct ext4_extent_idx *ix)
354 : {
355 0 : int i, retval = 0;
356 0 : ext4_fsblk_t block;
357 0 : struct buffer_head *bh;
358 0 : struct ext4_extent_header *eh;
359 :
360 0 : block = ext4_idx_pblock(ix);
361 0 : bh = ext4_sb_bread(inode->i_sb, block, 0);
362 0 : if (IS_ERR(bh))
363 0 : return PTR_ERR(bh);
364 :
365 0 : eh = (struct ext4_extent_header *)bh->b_data;
366 0 : if (eh->eh_depth != 0) {
367 0 : ix = EXT_FIRST_INDEX(eh);
368 0 : for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
369 0 : retval = free_ext_idx(handle, inode, ix);
370 0 : if (retval) {
371 0 : put_bh(bh);
372 0 : return retval;
373 : }
374 : }
375 : }
376 0 : put_bh(bh);
377 0 : retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
378 : ext4_free_metadata_revoke_credits(inode->i_sb, 1));
379 0 : if (retval < 0)
380 : return retval;
381 0 : ext4_free_blocks(handle, inode, NULL, block, 1,
382 : EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
383 0 : return 0;
384 : }
385 :
386 : /*
387 : * Free the extent meta data blocks only
388 : */
389 0 : static int free_ext_block(handle_t *handle, struct inode *inode)
390 : {
391 0 : int i, retval = 0;
392 0 : struct ext4_inode_info *ei = EXT4_I(inode);
393 0 : struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
394 0 : struct ext4_extent_idx *ix;
395 0 : if (eh->eh_depth == 0)
396 : /*
397 : * No extra blocks allocated for extent meta data
398 : */
399 : return 0;
400 0 : ix = EXT_FIRST_INDEX(eh);
401 0 : for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
402 0 : retval = free_ext_idx(handle, inode, ix);
403 0 : if (retval)
404 0 : return retval;
405 : }
406 : return retval;
407 : }
408 :
409 0 : int ext4_ext_migrate(struct inode *inode)
410 : {
411 0 : handle_t *handle;
412 0 : int retval = 0, i;
413 0 : __le32 *i_data;
414 0 : struct ext4_inode_info *ei;
415 0 : struct inode *tmp_inode = NULL;
416 0 : struct migrate_struct lb;
417 0 : unsigned long max_entries;
418 0 : __u32 goal, tmp_csum_seed;
419 0 : uid_t owner[2];
420 0 : int alloc_ctx;
421 :
422 : /*
423 : * If the filesystem does not support extents, or the inode
424 : * already is extent-based, error out.
425 : */
426 0 : if (!ext4_has_feature_extents(inode->i_sb) ||
427 : ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) ||
428 : ext4_has_inline_data(inode))
429 : return -EINVAL;
430 :
431 0 : if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
432 : /*
433 : * don't migrate fast symlink
434 : */
435 : return retval;
436 :
437 0 : alloc_ctx = ext4_writepages_down_write(inode->i_sb);
438 :
439 : /*
440 : * Worst case we can touch the allocation bitmaps and a block
441 : * group descriptor block. We do need to worry about
442 : * credits for modifying the quota inode.
443 : */
444 0 : handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
445 : 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
446 :
447 0 : if (IS_ERR(handle)) {
448 0 : retval = PTR_ERR(handle);
449 0 : goto out_unlock;
450 : }
451 0 : goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
452 0 : EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
453 0 : owner[0] = i_uid_read(inode);
454 0 : owner[1] = i_gid_read(inode);
455 0 : tmp_inode = ext4_new_inode(handle, d_inode(inode->i_sb->s_root),
456 : S_IFREG, NULL, goal, owner, 0);
457 0 : if (IS_ERR(tmp_inode)) {
458 0 : retval = PTR_ERR(tmp_inode);
459 0 : ext4_journal_stop(handle);
460 0 : goto out_unlock;
461 : }
462 : /*
463 : * Use the correct seed for checksum (i.e. the seed from 'inode'). This
464 : * is so that the metadata blocks will have the correct checksum after
465 : * the migration.
466 : */
467 0 : ei = EXT4_I(inode);
468 0 : tmp_csum_seed = EXT4_I(tmp_inode)->i_csum_seed;
469 0 : EXT4_I(tmp_inode)->i_csum_seed = ei->i_csum_seed;
470 0 : i_size_write(tmp_inode, i_size_read(inode));
471 : /*
472 : * Set the i_nlink to zero so it will be deleted later
473 : * when we drop inode reference.
474 : */
475 0 : clear_nlink(tmp_inode);
476 :
477 0 : ext4_ext_tree_init(handle, tmp_inode);
478 0 : ext4_journal_stop(handle);
479 :
480 : /*
481 : * start with one credit accounted for
482 : * superblock modification.
483 : *
484 : * For the tmp_inode we already have committed the
485 : * transaction that created the inode. Later as and
486 : * when we add extents we extent the journal
487 : */
488 : /*
489 : * Even though we take i_rwsem we can still cause block
490 : * allocation via mmap write to holes. If we have allocated
491 : * new blocks we fail migrate. New block allocation will
492 : * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
493 : * with i_data_sem held to prevent racing with block
494 : * allocation.
495 : */
496 0 : down_read(&EXT4_I(inode)->i_data_sem);
497 0 : ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
498 0 : up_read((&EXT4_I(inode)->i_data_sem));
499 :
500 0 : handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
501 0 : if (IS_ERR(handle)) {
502 0 : retval = PTR_ERR(handle);
503 0 : goto out_tmp_inode;
504 : }
505 :
506 0 : i_data = ei->i_data;
507 0 : memset(&lb, 0, sizeof(lb));
508 :
509 : /* 32 bit block address 4 bytes */
510 0 : max_entries = inode->i_sb->s_blocksize >> 2;
511 0 : for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
512 0 : if (i_data[i]) {
513 0 : retval = update_extent_range(handle, tmp_inode,
514 : le32_to_cpu(i_data[i]), &lb);
515 0 : if (retval)
516 0 : goto err_out;
517 : } else
518 0 : lb.curr_block++;
519 : }
520 0 : if (i_data[EXT4_IND_BLOCK]) {
521 0 : retval = update_ind_extent_range(handle, tmp_inode,
522 : le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
523 0 : if (retval)
524 0 : goto err_out;
525 : } else
526 0 : lb.curr_block += max_entries;
527 0 : if (i_data[EXT4_DIND_BLOCK]) {
528 0 : retval = update_dind_extent_range(handle, tmp_inode,
529 : le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
530 0 : if (retval)
531 0 : goto err_out;
532 : } else
533 0 : lb.curr_block += max_entries * max_entries;
534 0 : if (i_data[EXT4_TIND_BLOCK]) {
535 0 : retval = update_tind_extent_range(handle, tmp_inode,
536 : le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
537 0 : if (retval)
538 0 : goto err_out;
539 : }
540 : /*
541 : * Build the last extent
542 : */
543 0 : retval = finish_range(handle, tmp_inode, &lb);
544 0 : err_out:
545 0 : if (retval)
546 : /*
547 : * Failure case delete the extent information with the
548 : * tmp_inode
549 : */
550 0 : free_ext_block(handle, tmp_inode);
551 : else {
552 0 : retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
553 0 : if (retval)
554 : /*
555 : * if we fail to swap inode data free the extent
556 : * details of the tmp inode
557 : */
558 0 : free_ext_block(handle, tmp_inode);
559 : }
560 :
561 : /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
562 0 : retval = ext4_journal_ensure_credits(handle, 1, 0);
563 0 : if (retval < 0)
564 0 : goto out_stop;
565 : /*
566 : * Mark the tmp_inode as of size zero
567 : */
568 0 : i_size_write(tmp_inode, 0);
569 :
570 : /*
571 : * set the i_blocks count to zero
572 : * so that the ext4_evict_inode() does the
573 : * right job
574 : *
575 : * We don't need to take the i_lock because
576 : * the inode is not visible to user space.
577 : */
578 0 : tmp_inode->i_blocks = 0;
579 0 : EXT4_I(tmp_inode)->i_csum_seed = tmp_csum_seed;
580 :
581 : /* Reset the extent details */
582 0 : ext4_ext_tree_init(handle, tmp_inode);
583 0 : out_stop:
584 0 : ext4_journal_stop(handle);
585 0 : out_tmp_inode:
586 0 : unlock_new_inode(tmp_inode);
587 0 : iput(tmp_inode);
588 0 : out_unlock:
589 0 : ext4_writepages_up_write(inode->i_sb, alloc_ctx);
590 0 : return retval;
591 : }
592 :
593 : /*
594 : * Migrate a simple extent-based inode to use the i_blocks[] array
595 : */
596 0 : int ext4_ind_migrate(struct inode *inode)
597 : {
598 0 : struct ext4_extent_header *eh;
599 0 : struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
600 0 : struct ext4_super_block *es = sbi->s_es;
601 0 : struct ext4_inode_info *ei = EXT4_I(inode);
602 0 : struct ext4_extent *ex;
603 0 : unsigned int i, len;
604 0 : ext4_lblk_t start, end;
605 0 : ext4_fsblk_t blk;
606 0 : handle_t *handle;
607 0 : int ret, ret2 = 0;
608 0 : int alloc_ctx;
609 :
610 0 : if (!ext4_has_feature_extents(inode->i_sb) ||
611 : (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
612 : return -EINVAL;
613 :
614 0 : if (ext4_has_feature_bigalloc(inode->i_sb))
615 : return -EOPNOTSUPP;
616 :
617 : /*
618 : * In order to get correct extent info, force all delayed allocation
619 : * blocks to be allocated, otherwise delayed allocation blocks may not
620 : * be reflected and bypass the checks on extent header.
621 : */
622 0 : if (test_opt(inode->i_sb, DELALLOC))
623 0 : ext4_alloc_da_blocks(inode);
624 :
625 0 : alloc_ctx = ext4_writepages_down_write(inode->i_sb);
626 :
627 0 : handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
628 0 : if (IS_ERR(handle)) {
629 0 : ret = PTR_ERR(handle);
630 0 : goto out_unlock;
631 : }
632 :
633 0 : down_write(&EXT4_I(inode)->i_data_sem);
634 0 : ret = ext4_ext_check_inode(inode);
635 0 : if (ret)
636 0 : goto errout;
637 :
638 0 : eh = ext_inode_hdr(inode);
639 0 : ex = EXT_FIRST_EXTENT(eh);
640 0 : if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
641 0 : eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
642 0 : ret = -EOPNOTSUPP;
643 0 : goto errout;
644 : }
645 0 : if (eh->eh_entries == 0)
646 : blk = len = start = end = 0;
647 : else {
648 0 : len = le16_to_cpu(ex->ee_len);
649 0 : blk = ext4_ext_pblock(ex);
650 0 : start = le32_to_cpu(ex->ee_block);
651 0 : end = start + len - 1;
652 0 : if (end >= EXT4_NDIR_BLOCKS) {
653 0 : ret = -EOPNOTSUPP;
654 0 : goto errout;
655 : }
656 : }
657 :
658 0 : ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
659 0 : memset(ei->i_data, 0, sizeof(ei->i_data));
660 0 : for (i = start; i <= end; i++)
661 0 : ei->i_data[i] = cpu_to_le32(blk++);
662 0 : ret2 = ext4_mark_inode_dirty(handle, inode);
663 0 : if (unlikely(ret2 && !ret))
664 0 : ret = ret2;
665 0 : errout:
666 0 : ext4_journal_stop(handle);
667 0 : up_write(&EXT4_I(inode)->i_data_sem);
668 0 : out_unlock:
669 0 : ext4_writepages_up_write(inode->i_sb, alloc_ctx);
670 0 : return ret;
671 : }
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