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 convinience 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 accumalate extra
47 : * credit. But below we try to not accumalate 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_ext_drop_refs(path);
60 0 : kfree(path);
61 0 : lb->first_pblock = 0;
62 0 : return retval;
63 : }
64 :
65 0 : static int update_extent_range(handle_t *handle, struct inode *inode,
66 : ext4_fsblk_t pblock, struct migrate_struct *lb)
67 : {
68 0 : int retval;
69 : /*
70 : * See if we can add on to the existing range (if it exists)
71 : */
72 0 : if (lb->first_pblock &&
73 0 : (lb->last_pblock+1 == pblock) &&
74 0 : (lb->last_block+1 == lb->curr_block)) {
75 0 : lb->last_pblock = pblock;
76 0 : lb->last_block = lb->curr_block;
77 0 : lb->curr_block++;
78 0 : return 0;
79 : }
80 : /*
81 : * Start a new range.
82 : */
83 0 : retval = finish_range(handle, inode, lb);
84 0 : lb->first_pblock = lb->last_pblock = pblock;
85 0 : lb->first_block = lb->last_block = lb->curr_block;
86 0 : lb->curr_block++;
87 0 : return retval;
88 : }
89 :
90 0 : static int update_ind_extent_range(handle_t *handle, struct inode *inode,
91 : ext4_fsblk_t pblock,
92 : struct migrate_struct *lb)
93 : {
94 0 : struct buffer_head *bh;
95 0 : __le32 *i_data;
96 0 : int i, retval = 0;
97 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
98 :
99 0 : bh = ext4_sb_bread(inode->i_sb, pblock, 0);
100 0 : if (IS_ERR(bh))
101 0 : return PTR_ERR(bh);
102 :
103 0 : i_data = (__le32 *)bh->b_data;
104 0 : for (i = 0; i < max_entries; i++) {
105 0 : if (i_data[i]) {
106 0 : retval = update_extent_range(handle, inode,
107 : le32_to_cpu(i_data[i]), lb);
108 0 : if (retval)
109 : break;
110 : } else {
111 0 : lb->curr_block++;
112 : }
113 : }
114 0 : put_bh(bh);
115 0 : return retval;
116 :
117 : }
118 :
119 0 : static int update_dind_extent_range(handle_t *handle, struct inode *inode,
120 : ext4_fsblk_t pblock,
121 : struct migrate_struct *lb)
122 : {
123 0 : struct buffer_head *bh;
124 0 : __le32 *i_data;
125 0 : int i, retval = 0;
126 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
127 :
128 0 : bh = ext4_sb_bread(inode->i_sb, pblock, 0);
129 0 : if (IS_ERR(bh))
130 0 : return PTR_ERR(bh);
131 :
132 0 : i_data = (__le32 *)bh->b_data;
133 0 : for (i = 0; i < max_entries; i++) {
134 0 : if (i_data[i]) {
135 0 : retval = update_ind_extent_range(handle, inode,
136 : le32_to_cpu(i_data[i]), lb);
137 0 : if (retval)
138 : break;
139 : } else {
140 : /* Only update the file block number */
141 0 : lb->curr_block += max_entries;
142 : }
143 : }
144 0 : put_bh(bh);
145 0 : return retval;
146 :
147 : }
148 :
149 0 : static int update_tind_extent_range(handle_t *handle, struct inode *inode,
150 : ext4_fsblk_t pblock,
151 : struct migrate_struct *lb)
152 : {
153 0 : struct buffer_head *bh;
154 0 : __le32 *i_data;
155 0 : int i, retval = 0;
156 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
157 :
158 0 : bh = ext4_sb_bread(inode->i_sb, pblock, 0);
159 0 : if (IS_ERR(bh))
160 0 : return PTR_ERR(bh);
161 :
162 0 : i_data = (__le32 *)bh->b_data;
163 0 : for (i = 0; i < max_entries; i++) {
164 0 : if (i_data[i]) {
165 0 : retval = update_dind_extent_range(handle, inode,
166 : le32_to_cpu(i_data[i]), lb);
167 0 : if (retval)
168 : break;
169 : } else {
170 : /* Only update the file block number */
171 0 : lb->curr_block += max_entries * max_entries;
172 : }
173 : }
174 0 : put_bh(bh);
175 0 : return retval;
176 :
177 : }
178 :
179 0 : static int free_dind_blocks(handle_t *handle,
180 : struct inode *inode, __le32 i_data)
181 : {
182 0 : int i;
183 0 : __le32 *tmp_idata;
184 0 : struct buffer_head *bh;
185 0 : struct super_block *sb = inode->i_sb;
186 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
187 0 : int err;
188 :
189 0 : bh = ext4_sb_bread(sb, le32_to_cpu(i_data), 0);
190 0 : if (IS_ERR(bh))
191 0 : return PTR_ERR(bh);
192 :
193 0 : tmp_idata = (__le32 *)bh->b_data;
194 0 : for (i = 0; i < max_entries; i++) {
195 0 : if (tmp_idata[i]) {
196 0 : err = ext4_journal_ensure_credits(handle,
197 : EXT4_RESERVE_TRANS_BLOCKS,
198 : ext4_free_metadata_revoke_credits(sb, 1));
199 0 : if (err < 0) {
200 0 : put_bh(bh);
201 0 : return err;
202 : }
203 0 : ext4_free_blocks(handle, inode, NULL,
204 0 : le32_to_cpu(tmp_idata[i]), 1,
205 : EXT4_FREE_BLOCKS_METADATA |
206 : EXT4_FREE_BLOCKS_FORGET);
207 : }
208 : }
209 0 : put_bh(bh);
210 0 : err = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
211 : ext4_free_metadata_revoke_credits(sb, 1));
212 0 : if (err < 0)
213 : return err;
214 0 : ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
215 : EXT4_FREE_BLOCKS_METADATA |
216 : EXT4_FREE_BLOCKS_FORGET);
217 0 : return 0;
218 : }
219 :
220 0 : static int free_tind_blocks(handle_t *handle,
221 : struct inode *inode, __le32 i_data)
222 : {
223 0 : int i, retval = 0;
224 0 : __le32 *tmp_idata;
225 0 : struct buffer_head *bh;
226 0 : unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
227 :
228 0 : bh = ext4_sb_bread(inode->i_sb, le32_to_cpu(i_data), 0);
229 0 : if (IS_ERR(bh))
230 0 : return PTR_ERR(bh);
231 :
232 0 : tmp_idata = (__le32 *)bh->b_data;
233 0 : for (i = 0; i < max_entries; i++) {
234 0 : if (tmp_idata[i]) {
235 0 : retval = free_dind_blocks(handle,
236 : inode, tmp_idata[i]);
237 0 : if (retval) {
238 0 : put_bh(bh);
239 0 : return retval;
240 : }
241 : }
242 : }
243 0 : put_bh(bh);
244 0 : retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
245 : ext4_free_metadata_revoke_credits(inode->i_sb, 1));
246 0 : if (retval < 0)
247 : return retval;
248 0 : ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
249 : EXT4_FREE_BLOCKS_METADATA |
250 : EXT4_FREE_BLOCKS_FORGET);
251 0 : return 0;
252 : }
253 :
254 0 : static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
255 : {
256 0 : int retval;
257 :
258 : /* ei->i_data[EXT4_IND_BLOCK] */
259 0 : if (i_data[0]) {
260 0 : retval = ext4_journal_ensure_credits(handle,
261 : EXT4_RESERVE_TRANS_BLOCKS,
262 : ext4_free_metadata_revoke_credits(inode->i_sb, 1));
263 0 : if (retval < 0)
264 : return retval;
265 0 : ext4_free_blocks(handle, inode, NULL,
266 0 : le32_to_cpu(i_data[0]), 1,
267 : EXT4_FREE_BLOCKS_METADATA |
268 : EXT4_FREE_BLOCKS_FORGET);
269 : }
270 :
271 : /* ei->i_data[EXT4_DIND_BLOCK] */
272 0 : if (i_data[1]) {
273 0 : retval = free_dind_blocks(handle, inode, i_data[1]);
274 0 : if (retval)
275 : return retval;
276 : }
277 :
278 : /* ei->i_data[EXT4_TIND_BLOCK] */
279 0 : if (i_data[2]) {
280 0 : retval = free_tind_blocks(handle, inode, i_data[2]);
281 0 : if (retval)
282 0 : return retval;
283 : }
284 : return 0;
285 : }
286 :
287 0 : static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
288 : struct inode *tmp_inode)
289 : {
290 0 : int retval, retval2 = 0;
291 0 : __le32 i_data[3];
292 0 : struct ext4_inode_info *ei = EXT4_I(inode);
293 0 : struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
294 :
295 : /*
296 : * One credit accounted for writing the
297 : * i_data field of the original inode
298 : */
299 0 : retval = ext4_journal_ensure_credits(handle, 1, 0);
300 0 : if (retval < 0)
301 0 : goto err_out;
302 :
303 0 : i_data[0] = ei->i_data[EXT4_IND_BLOCK];
304 0 : i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
305 0 : i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
306 :
307 0 : down_write(&EXT4_I(inode)->i_data_sem);
308 : /*
309 : * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
310 : * happened after we started the migrate. We need to
311 : * fail the migrate
312 : */
313 0 : if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
314 0 : retval = -EAGAIN;
315 0 : up_write(&EXT4_I(inode)->i_data_sem);
316 0 : goto err_out;
317 : } else
318 0 : ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
319 : /*
320 : * We have the extent map build with the tmp inode.
321 : * Now copy the i_data across
322 : */
323 0 : ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
324 0 : memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
325 :
326 : /*
327 : * Update i_blocks with the new blocks that got
328 : * allocated while adding extents for extent index
329 : * blocks.
330 : *
331 : * While converting to extents we need not
332 : * update the original inode i_blocks for extent blocks
333 : * via quota APIs. The quota update happened via tmp_inode already.
334 : */
335 0 : spin_lock(&inode->i_lock);
336 0 : inode->i_blocks += tmp_inode->i_blocks;
337 0 : spin_unlock(&inode->i_lock);
338 0 : up_write(&EXT4_I(inode)->i_data_sem);
339 :
340 : /*
341 : * We mark the inode dirty after, because we decrement the
342 : * i_blocks when freeing the indirect meta-data blocks
343 : */
344 0 : retval = free_ind_block(handle, inode, i_data);
345 0 : retval2 = ext4_mark_inode_dirty(handle, inode);
346 0 : if (unlikely(retval2 && !retval))
347 0 : retval = retval2;
348 :
349 0 : err_out:
350 0 : return retval;
351 : }
352 :
353 0 : static int free_ext_idx(handle_t *handle, struct inode *inode,
354 : struct ext4_extent_idx *ix)
355 : {
356 0 : int i, retval = 0;
357 0 : ext4_fsblk_t block;
358 0 : struct buffer_head *bh;
359 0 : struct ext4_extent_header *eh;
360 :
361 0 : block = ext4_idx_pblock(ix);
362 0 : bh = ext4_sb_bread(inode->i_sb, block, 0);
363 0 : if (IS_ERR(bh))
364 0 : return PTR_ERR(bh);
365 :
366 0 : eh = (struct ext4_extent_header *)bh->b_data;
367 0 : if (eh->eh_depth != 0) {
368 0 : ix = EXT_FIRST_INDEX(eh);
369 0 : for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
370 0 : retval = free_ext_idx(handle, inode, ix);
371 0 : if (retval) {
372 0 : put_bh(bh);
373 0 : return retval;
374 : }
375 : }
376 : }
377 0 : put_bh(bh);
378 0 : retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS,
379 : ext4_free_metadata_revoke_credits(inode->i_sb, 1));
380 0 : if (retval < 0)
381 : return retval;
382 0 : ext4_free_blocks(handle, inode, NULL, block, 1,
383 : EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
384 0 : return 0;
385 : }
386 :
387 : /*
388 : * Free the extent meta data blocks only
389 : */
390 0 : static int free_ext_block(handle_t *handle, struct inode *inode)
391 : {
392 0 : int i, retval = 0;
393 0 : struct ext4_inode_info *ei = EXT4_I(inode);
394 0 : struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
395 0 : struct ext4_extent_idx *ix;
396 0 : if (eh->eh_depth == 0)
397 : /*
398 : * No extra blocks allocated for extent meta data
399 : */
400 : return 0;
401 0 : ix = EXT_FIRST_INDEX(eh);
402 0 : for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
403 0 : retval = free_ext_idx(handle, inode, ix);
404 0 : if (retval)
405 0 : return retval;
406 : }
407 : return retval;
408 : }
409 :
410 0 : int ext4_ext_migrate(struct inode *inode)
411 : {
412 0 : struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
413 0 : handle_t *handle;
414 0 : int retval = 0, i;
415 0 : __le32 *i_data;
416 0 : struct ext4_inode_info *ei;
417 0 : struct inode *tmp_inode = NULL;
418 0 : struct migrate_struct lb;
419 0 : unsigned long max_entries;
420 0 : __u32 goal;
421 0 : uid_t owner[2];
422 :
423 : /*
424 : * If the filesystem does not support extents, or the inode
425 : * already is extent-based, error out.
426 : */
427 0 : if (!ext4_has_feature_extents(inode->i_sb) ||
428 0 : (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
429 0 : 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 : percpu_down_write(&sbi->s_writepages_rwsem);
438 :
439 : /*
440 : * Worst case we can touch the allocation bitmaps, a bgd
441 : * block, and a block to link in the orphan list. We do need
442 : * need to worry about credits for modifying the quota inode.
443 : */
444 0 : handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
445 : 4 + 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 0 : i_size_write(tmp_inode, i_size_read(inode));
463 : /*
464 : * Set the i_nlink to zero so it will be deleted later
465 : * when we drop inode reference.
466 : */
467 0 : clear_nlink(tmp_inode);
468 :
469 0 : ext4_ext_tree_init(handle, tmp_inode);
470 0 : ext4_orphan_add(handle, tmp_inode);
471 0 : ext4_journal_stop(handle);
472 :
473 : /*
474 : * start with one credit accounted for
475 : * superblock modification.
476 : *
477 : * For the tmp_inode we already have committed the
478 : * transaction that created the inode. Later as and
479 : * when we add extents we extent the journal
480 : */
481 : /*
482 : * Even though we take i_mutex we can still cause block
483 : * allocation via mmap write to holes. If we have allocated
484 : * new blocks we fail migrate. New block allocation will
485 : * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
486 : * with i_data_sem held to prevent racing with block
487 : * allocation.
488 : */
489 0 : down_read(&EXT4_I(inode)->i_data_sem);
490 0 : ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
491 0 : up_read((&EXT4_I(inode)->i_data_sem));
492 :
493 0 : handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
494 0 : if (IS_ERR(handle)) {
495 : /*
496 : * It is impossible to update on-disk structures without
497 : * a handle, so just rollback in-core changes and live other
498 : * work to orphan_list_cleanup()
499 : */
500 0 : ext4_orphan_del(NULL, tmp_inode);
501 0 : retval = PTR_ERR(handle);
502 0 : goto out_tmp_inode;
503 : }
504 :
505 0 : ei = EXT4_I(inode);
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 :
580 : /* Reset the extent details */
581 0 : ext4_ext_tree_init(handle, tmp_inode);
582 0 : out_stop:
583 0 : ext4_journal_stop(handle);
584 0 : out_tmp_inode:
585 0 : unlock_new_inode(tmp_inode);
586 0 : iput(tmp_inode);
587 0 : out_unlock:
588 0 : percpu_up_write(&sbi->s_writepages_rwsem);
589 0 : return retval;
590 : }
591 :
592 : /*
593 : * Migrate a simple extent-based inode to use the i_blocks[] array
594 : */
595 0 : int ext4_ind_migrate(struct inode *inode)
596 : {
597 0 : struct ext4_extent_header *eh;
598 0 : struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
599 0 : struct ext4_super_block *es = sbi->s_es;
600 0 : struct ext4_inode_info *ei = EXT4_I(inode);
601 0 : struct ext4_extent *ex;
602 0 : unsigned int i, len;
603 0 : ext4_lblk_t start, end;
604 0 : ext4_fsblk_t blk;
605 0 : handle_t *handle;
606 0 : int ret, ret2 = 0;
607 :
608 0 : if (!ext4_has_feature_extents(inode->i_sb) ||
609 0 : (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
610 0 : return -EINVAL;
611 :
612 0 : if (ext4_has_feature_bigalloc(inode->i_sb))
613 : return -EOPNOTSUPP;
614 :
615 : /*
616 : * In order to get correct extent info, force all delayed allocation
617 : * blocks to be allocated, otherwise delayed allocation blocks may not
618 : * be reflected and bypass the checks on extent header.
619 : */
620 0 : if (test_opt(inode->i_sb, DELALLOC))
621 0 : ext4_alloc_da_blocks(inode);
622 :
623 0 : percpu_down_write(&sbi->s_writepages_rwsem);
624 :
625 0 : handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
626 0 : if (IS_ERR(handle)) {
627 0 : ret = PTR_ERR(handle);
628 0 : goto out_unlock;
629 : }
630 :
631 0 : down_write(&EXT4_I(inode)->i_data_sem);
632 0 : ret = ext4_ext_check_inode(inode);
633 0 : if (ret)
634 0 : goto errout;
635 :
636 0 : eh = ext_inode_hdr(inode);
637 0 : ex = EXT_FIRST_EXTENT(eh);
638 0 : if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
639 0 : eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
640 0 : ret = -EOPNOTSUPP;
641 0 : goto errout;
642 : }
643 0 : if (eh->eh_entries == 0)
644 0 : blk = len = start = end = 0;
645 : else {
646 0 : len = le16_to_cpu(ex->ee_len);
647 0 : blk = ext4_ext_pblock(ex);
648 0 : start = le32_to_cpu(ex->ee_block);
649 0 : end = start + len - 1;
650 0 : if (end >= EXT4_NDIR_BLOCKS) {
651 0 : ret = -EOPNOTSUPP;
652 0 : goto errout;
653 : }
654 : }
655 :
656 0 : ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
657 0 : memset(ei->i_data, 0, sizeof(ei->i_data));
658 0 : for (i = start; i <= end; i++)
659 0 : ei->i_data[i] = cpu_to_le32(blk++);
660 0 : ret2 = ext4_mark_inode_dirty(handle, inode);
661 0 : if (unlikely(ret2 && !ret))
662 0 : ret = ret2;
663 0 : errout:
664 0 : ext4_journal_stop(handle);
665 0 : up_write(&EXT4_I(inode)->i_data_sem);
666 0 : out_unlock:
667 0 : percpu_up_write(&sbi->s_writepages_rwsem);
668 0 : return ret;
669 : }
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