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ext4: fix error handling in ext4_fc_record_modified_inode()
[mirror_ubuntu-jammy-kernel.git] / fs / ext4 / inline.c
1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 * Copyright (c) 2012 Taobao.
4 * Written by Tao Ma <boyu.mt@taobao.com>
5 */
6
7 #include <linux/iomap.h>
8 #include <linux/fiemap.h>
9 #include <linux/iversion.h>
10 #include <linux/backing-dev.h>
11
12 #include "ext4_jbd2.h"
13 #include "ext4.h"
14 #include "xattr.h"
15 #include "truncate.h"
16
17 #define EXT4_XATTR_SYSTEM_DATA "data"
18 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
19 #define EXT4_INLINE_DOTDOT_OFFSET 2
20 #define EXT4_INLINE_DOTDOT_SIZE 4
21
22 static int ext4_get_inline_size(struct inode *inode)
23 {
24 if (EXT4_I(inode)->i_inline_off)
25 return EXT4_I(inode)->i_inline_size;
26
27 return 0;
28 }
29
30 static int get_max_inline_xattr_value_size(struct inode *inode,
31 struct ext4_iloc *iloc)
32 {
33 struct ext4_xattr_ibody_header *header;
34 struct ext4_xattr_entry *entry;
35 struct ext4_inode *raw_inode;
36 int free, min_offs;
37
38 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
39 EXT4_GOOD_OLD_INODE_SIZE -
40 EXT4_I(inode)->i_extra_isize -
41 sizeof(struct ext4_xattr_ibody_header);
42
43 /*
44 * We need to subtract another sizeof(__u32) since an in-inode xattr
45 * needs an empty 4 bytes to indicate the gap between the xattr entry
46 * and the name/value pair.
47 */
48 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
49 return EXT4_XATTR_SIZE(min_offs -
50 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
51 EXT4_XATTR_ROUND - sizeof(__u32));
52
53 raw_inode = ext4_raw_inode(iloc);
54 header = IHDR(inode, raw_inode);
55 entry = IFIRST(header);
56
57 /* Compute min_offs. */
58 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
59 if (!entry->e_value_inum && entry->e_value_size) {
60 size_t offs = le16_to_cpu(entry->e_value_offs);
61 if (offs < min_offs)
62 min_offs = offs;
63 }
64 }
65 free = min_offs -
66 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
67
68 if (EXT4_I(inode)->i_inline_off) {
69 entry = (struct ext4_xattr_entry *)
70 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
71
72 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
73 goto out;
74 }
75
76 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
77
78 if (free > EXT4_XATTR_ROUND)
79 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
80 else
81 free = 0;
82
83 out:
84 return free;
85 }
86
87 /*
88 * Get the maximum size we now can store in an inode.
89 * If we can't find the space for a xattr entry, don't use the space
90 * of the extents since we have no space to indicate the inline data.
91 */
92 int ext4_get_max_inline_size(struct inode *inode)
93 {
94 int error, max_inline_size;
95 struct ext4_iloc iloc;
96
97 if (EXT4_I(inode)->i_extra_isize == 0)
98 return 0;
99
100 error = ext4_get_inode_loc(inode, &iloc);
101 if (error) {
102 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
103 "can't get inode location %lu",
104 inode->i_ino);
105 return 0;
106 }
107
108 down_read(&EXT4_I(inode)->xattr_sem);
109 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
110 up_read(&EXT4_I(inode)->xattr_sem);
111
112 brelse(iloc.bh);
113
114 if (!max_inline_size)
115 return 0;
116
117 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
118 }
119
120 /*
121 * this function does not take xattr_sem, which is OK because it is
122 * currently only used in a code path coming form ext4_iget, before
123 * the new inode has been unlocked
124 */
125 int ext4_find_inline_data_nolock(struct inode *inode)
126 {
127 struct ext4_xattr_ibody_find is = {
128 .s = { .not_found = -ENODATA, },
129 };
130 struct ext4_xattr_info i = {
131 .name_index = EXT4_XATTR_INDEX_SYSTEM,
132 .name = EXT4_XATTR_SYSTEM_DATA,
133 };
134 int error;
135
136 if (EXT4_I(inode)->i_extra_isize == 0)
137 return 0;
138
139 error = ext4_get_inode_loc(inode, &is.iloc);
140 if (error)
141 return error;
142
143 error = ext4_xattr_ibody_find(inode, &i, &is);
144 if (error)
145 goto out;
146
147 if (!is.s.not_found) {
148 if (is.s.here->e_value_inum) {
149 EXT4_ERROR_INODE(inode, "inline data xattr refers "
150 "to an external xattr inode");
151 error = -EFSCORRUPTED;
152 goto out;
153 }
154 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
155 (void *)ext4_raw_inode(&is.iloc));
156 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
157 le32_to_cpu(is.s.here->e_value_size);
158 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
159 }
160 out:
161 brelse(is.iloc.bh);
162 return error;
163 }
164
165 static int ext4_read_inline_data(struct inode *inode, void *buffer,
166 unsigned int len,
167 struct ext4_iloc *iloc)
168 {
169 struct ext4_xattr_entry *entry;
170 struct ext4_xattr_ibody_header *header;
171 int cp_len = 0;
172 struct ext4_inode *raw_inode;
173
174 if (!len)
175 return 0;
176
177 BUG_ON(len > EXT4_I(inode)->i_inline_size);
178
179 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
180 len : EXT4_MIN_INLINE_DATA_SIZE;
181
182 raw_inode = ext4_raw_inode(iloc);
183 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
184
185 len -= cp_len;
186 buffer += cp_len;
187
188 if (!len)
189 goto out;
190
191 header = IHDR(inode, raw_inode);
192 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
193 EXT4_I(inode)->i_inline_off);
194 len = min_t(unsigned int, len,
195 (unsigned int)le32_to_cpu(entry->e_value_size));
196
197 memcpy(buffer,
198 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
199 cp_len += len;
200
201 out:
202 return cp_len;
203 }
204
205 /*
206 * write the buffer to the inline inode.
207 * If 'create' is set, we don't need to do the extra copy in the xattr
208 * value since it is already handled by ext4_xattr_ibody_set.
209 * That saves us one memcpy.
210 */
211 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
212 void *buffer, loff_t pos, unsigned int len)
213 {
214 struct ext4_xattr_entry *entry;
215 struct ext4_xattr_ibody_header *header;
216 struct ext4_inode *raw_inode;
217 int cp_len = 0;
218
219 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
220 return;
221
222 BUG_ON(!EXT4_I(inode)->i_inline_off);
223 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
224
225 raw_inode = ext4_raw_inode(iloc);
226 buffer += pos;
227
228 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
229 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
230 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
231 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
232
233 len -= cp_len;
234 buffer += cp_len;
235 pos += cp_len;
236 }
237
238 if (!len)
239 return;
240
241 pos -= EXT4_MIN_INLINE_DATA_SIZE;
242 header = IHDR(inode, raw_inode);
243 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
244 EXT4_I(inode)->i_inline_off);
245
246 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
247 buffer, len);
248 }
249
250 static int ext4_create_inline_data(handle_t *handle,
251 struct inode *inode, unsigned len)
252 {
253 int error;
254 void *value = NULL;
255 struct ext4_xattr_ibody_find is = {
256 .s = { .not_found = -ENODATA, },
257 };
258 struct ext4_xattr_info i = {
259 .name_index = EXT4_XATTR_INDEX_SYSTEM,
260 .name = EXT4_XATTR_SYSTEM_DATA,
261 };
262
263 error = ext4_get_inode_loc(inode, &is.iloc);
264 if (error)
265 return error;
266
267 BUFFER_TRACE(is.iloc.bh, "get_write_access");
268 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
269 EXT4_JTR_NONE);
270 if (error)
271 goto out;
272
273 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
274 value = EXT4_ZERO_XATTR_VALUE;
275 len -= EXT4_MIN_INLINE_DATA_SIZE;
276 } else {
277 value = "";
278 len = 0;
279 }
280
281 /* Insert the xttr entry. */
282 i.value = value;
283 i.value_len = len;
284
285 error = ext4_xattr_ibody_find(inode, &i, &is);
286 if (error)
287 goto out;
288
289 BUG_ON(!is.s.not_found);
290
291 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
292 if (error) {
293 if (error == -ENOSPC)
294 ext4_clear_inode_state(inode,
295 EXT4_STATE_MAY_INLINE_DATA);
296 goto out;
297 }
298
299 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
300 0, EXT4_MIN_INLINE_DATA_SIZE);
301
302 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
303 (void *)ext4_raw_inode(&is.iloc));
304 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
305 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
306 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
307 get_bh(is.iloc.bh);
308 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
309
310 out:
311 brelse(is.iloc.bh);
312 return error;
313 }
314
315 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
316 unsigned int len)
317 {
318 int error;
319 void *value = NULL;
320 struct ext4_xattr_ibody_find is = {
321 .s = { .not_found = -ENODATA, },
322 };
323 struct ext4_xattr_info i = {
324 .name_index = EXT4_XATTR_INDEX_SYSTEM,
325 .name = EXT4_XATTR_SYSTEM_DATA,
326 };
327
328 /* If the old space is ok, write the data directly. */
329 if (len <= EXT4_I(inode)->i_inline_size)
330 return 0;
331
332 error = ext4_get_inode_loc(inode, &is.iloc);
333 if (error)
334 return error;
335
336 error = ext4_xattr_ibody_find(inode, &i, &is);
337 if (error)
338 goto out;
339
340 BUG_ON(is.s.not_found);
341
342 len -= EXT4_MIN_INLINE_DATA_SIZE;
343 value = kzalloc(len, GFP_NOFS);
344 if (!value) {
345 error = -ENOMEM;
346 goto out;
347 }
348
349 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
350 value, len);
351 if (error == -ENODATA)
352 goto out;
353
354 BUFFER_TRACE(is.iloc.bh, "get_write_access");
355 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
356 EXT4_JTR_NONE);
357 if (error)
358 goto out;
359
360 /* Update the xattr entry. */
361 i.value = value;
362 i.value_len = len;
363
364 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
365 if (error)
366 goto out;
367
368 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
369 (void *)ext4_raw_inode(&is.iloc));
370 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
371 le32_to_cpu(is.s.here->e_value_size);
372 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
373 get_bh(is.iloc.bh);
374 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
375
376 out:
377 kfree(value);
378 brelse(is.iloc.bh);
379 return error;
380 }
381
382 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
383 unsigned int len)
384 {
385 int ret, size, no_expand;
386 struct ext4_inode_info *ei = EXT4_I(inode);
387
388 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
389 return -ENOSPC;
390
391 size = ext4_get_max_inline_size(inode);
392 if (size < len)
393 return -ENOSPC;
394
395 ext4_write_lock_xattr(inode, &no_expand);
396
397 if (ei->i_inline_off)
398 ret = ext4_update_inline_data(handle, inode, len);
399 else
400 ret = ext4_create_inline_data(handle, inode, len);
401
402 ext4_write_unlock_xattr(inode, &no_expand);
403 return ret;
404 }
405
406 static int ext4_destroy_inline_data_nolock(handle_t *handle,
407 struct inode *inode)
408 {
409 struct ext4_inode_info *ei = EXT4_I(inode);
410 struct ext4_xattr_ibody_find is = {
411 .s = { .not_found = 0, },
412 };
413 struct ext4_xattr_info i = {
414 .name_index = EXT4_XATTR_INDEX_SYSTEM,
415 .name = EXT4_XATTR_SYSTEM_DATA,
416 .value = NULL,
417 .value_len = 0,
418 };
419 int error;
420
421 if (!ei->i_inline_off)
422 return 0;
423
424 error = ext4_get_inode_loc(inode, &is.iloc);
425 if (error)
426 return error;
427
428 error = ext4_xattr_ibody_find(inode, &i, &is);
429 if (error)
430 goto out;
431
432 BUFFER_TRACE(is.iloc.bh, "get_write_access");
433 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
434 EXT4_JTR_NONE);
435 if (error)
436 goto out;
437
438 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
439 if (error)
440 goto out;
441
442 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
443 0, EXT4_MIN_INLINE_DATA_SIZE);
444 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
445
446 if (ext4_has_feature_extents(inode->i_sb)) {
447 if (S_ISDIR(inode->i_mode) ||
448 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
449 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
450 ext4_ext_tree_init(handle, inode);
451 }
452 }
453 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
454
455 get_bh(is.iloc.bh);
456 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
457
458 EXT4_I(inode)->i_inline_off = 0;
459 EXT4_I(inode)->i_inline_size = 0;
460 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
461 out:
462 brelse(is.iloc.bh);
463 if (error == -ENODATA)
464 error = 0;
465 return error;
466 }
467
468 static int ext4_read_inline_page(struct inode *inode, struct page *page)
469 {
470 void *kaddr;
471 int ret = 0;
472 size_t len;
473 struct ext4_iloc iloc;
474
475 BUG_ON(!PageLocked(page));
476 BUG_ON(!ext4_has_inline_data(inode));
477 BUG_ON(page->index);
478
479 if (!EXT4_I(inode)->i_inline_off) {
480 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
481 inode->i_ino);
482 goto out;
483 }
484
485 ret = ext4_get_inode_loc(inode, &iloc);
486 if (ret)
487 goto out;
488
489 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
490 kaddr = kmap_atomic(page);
491 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
492 flush_dcache_page(page);
493 kunmap_atomic(kaddr);
494 zero_user_segment(page, len, PAGE_SIZE);
495 SetPageUptodate(page);
496 brelse(iloc.bh);
497
498 out:
499 return ret;
500 }
501
502 int ext4_readpage_inline(struct inode *inode, struct page *page)
503 {
504 int ret = 0;
505
506 down_read(&EXT4_I(inode)->xattr_sem);
507 if (!ext4_has_inline_data(inode)) {
508 up_read(&EXT4_I(inode)->xattr_sem);
509 return -EAGAIN;
510 }
511
512 /*
513 * Current inline data can only exist in the 1st page,
514 * So for all the other pages, just set them uptodate.
515 */
516 if (!page->index)
517 ret = ext4_read_inline_page(inode, page);
518 else if (!PageUptodate(page)) {
519 zero_user_segment(page, 0, PAGE_SIZE);
520 SetPageUptodate(page);
521 }
522
523 up_read(&EXT4_I(inode)->xattr_sem);
524
525 unlock_page(page);
526 return ret >= 0 ? 0 : ret;
527 }
528
529 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
530 struct inode *inode,
531 unsigned flags)
532 {
533 int ret, needed_blocks, no_expand;
534 handle_t *handle = NULL;
535 int retries = 0, sem_held = 0;
536 struct page *page = NULL;
537 unsigned from, to;
538 struct ext4_iloc iloc;
539
540 if (!ext4_has_inline_data(inode)) {
541 /*
542 * clear the flag so that no new write
543 * will trap here again.
544 */
545 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
546 return 0;
547 }
548
549 needed_blocks = ext4_writepage_trans_blocks(inode);
550
551 ret = ext4_get_inode_loc(inode, &iloc);
552 if (ret)
553 return ret;
554
555 retry:
556 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
557 if (IS_ERR(handle)) {
558 ret = PTR_ERR(handle);
559 handle = NULL;
560 goto out;
561 }
562
563 /* We cannot recurse into the filesystem as the transaction is already
564 * started */
565 flags |= AOP_FLAG_NOFS;
566
567 page = grab_cache_page_write_begin(mapping, 0, flags);
568 if (!page) {
569 ret = -ENOMEM;
570 goto out;
571 }
572
573 ext4_write_lock_xattr(inode, &no_expand);
574 sem_held = 1;
575 /* If some one has already done this for us, just exit. */
576 if (!ext4_has_inline_data(inode)) {
577 ret = 0;
578 goto out;
579 }
580
581 from = 0;
582 to = ext4_get_inline_size(inode);
583 if (!PageUptodate(page)) {
584 ret = ext4_read_inline_page(inode, page);
585 if (ret < 0)
586 goto out;
587 }
588
589 ret = ext4_destroy_inline_data_nolock(handle, inode);
590 if (ret)
591 goto out;
592
593 if (ext4_should_dioread_nolock(inode)) {
594 ret = __block_write_begin(page, from, to,
595 ext4_get_block_unwritten);
596 } else
597 ret = __block_write_begin(page, from, to, ext4_get_block);
598
599 if (!ret && ext4_should_journal_data(inode)) {
600 ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
601 from, to, NULL,
602 do_journal_get_write_access);
603 }
604
605 if (ret) {
606 unlock_page(page);
607 put_page(page);
608 page = NULL;
609 ext4_orphan_add(handle, inode);
610 ext4_write_unlock_xattr(inode, &no_expand);
611 sem_held = 0;
612 ext4_journal_stop(handle);
613 handle = NULL;
614 ext4_truncate_failed_write(inode);
615 /*
616 * If truncate failed early the inode might
617 * still be on the orphan list; we need to
618 * make sure the inode is removed from the
619 * orphan list in that case.
620 */
621 if (inode->i_nlink)
622 ext4_orphan_del(NULL, inode);
623 }
624
625 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
626 goto retry;
627
628 if (page)
629 block_commit_write(page, from, to);
630 out:
631 if (page) {
632 unlock_page(page);
633 put_page(page);
634 }
635 if (sem_held)
636 ext4_write_unlock_xattr(inode, &no_expand);
637 if (handle)
638 ext4_journal_stop(handle);
639 brelse(iloc.bh);
640 return ret;
641 }
642
643 /*
644 * Try to write data in the inode.
645 * If the inode has inline data, check whether the new write can be
646 * in the inode also. If not, create the page the handle, move the data
647 * to the page make it update and let the later codes create extent for it.
648 */
649 int ext4_try_to_write_inline_data(struct address_space *mapping,
650 struct inode *inode,
651 loff_t pos, unsigned len,
652 unsigned flags,
653 struct page **pagep)
654 {
655 int ret;
656 handle_t *handle;
657 struct page *page;
658 struct ext4_iloc iloc;
659
660 if (pos + len > ext4_get_max_inline_size(inode))
661 goto convert;
662
663 ret = ext4_get_inode_loc(inode, &iloc);
664 if (ret)
665 return ret;
666
667 /*
668 * The possible write could happen in the inode,
669 * so try to reserve the space in inode first.
670 */
671 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
672 if (IS_ERR(handle)) {
673 ret = PTR_ERR(handle);
674 handle = NULL;
675 goto out;
676 }
677
678 ret = ext4_prepare_inline_data(handle, inode, pos + len);
679 if (ret && ret != -ENOSPC)
680 goto out;
681
682 /* We don't have space in inline inode, so convert it to extent. */
683 if (ret == -ENOSPC) {
684 ext4_journal_stop(handle);
685 brelse(iloc.bh);
686 goto convert;
687 }
688
689 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
690 EXT4_JTR_NONE);
691 if (ret)
692 goto out;
693
694 flags |= AOP_FLAG_NOFS;
695
696 page = grab_cache_page_write_begin(mapping, 0, flags);
697 if (!page) {
698 ret = -ENOMEM;
699 goto out;
700 }
701
702 *pagep = page;
703 down_read(&EXT4_I(inode)->xattr_sem);
704 if (!ext4_has_inline_data(inode)) {
705 ret = 0;
706 unlock_page(page);
707 put_page(page);
708 goto out_up_read;
709 }
710
711 if (!PageUptodate(page)) {
712 ret = ext4_read_inline_page(inode, page);
713 if (ret < 0) {
714 unlock_page(page);
715 put_page(page);
716 goto out_up_read;
717 }
718 }
719
720 ret = 1;
721 handle = NULL;
722 out_up_read:
723 up_read(&EXT4_I(inode)->xattr_sem);
724 out:
725 if (handle && (ret != 1))
726 ext4_journal_stop(handle);
727 brelse(iloc.bh);
728 return ret;
729 convert:
730 return ext4_convert_inline_data_to_extent(mapping,
731 inode, flags);
732 }
733
734 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
735 unsigned copied, struct page *page)
736 {
737 handle_t *handle = ext4_journal_current_handle();
738 int no_expand;
739 void *kaddr;
740 struct ext4_iloc iloc;
741 int ret = 0, ret2;
742
743 if (unlikely(copied < len) && !PageUptodate(page))
744 copied = 0;
745
746 if (likely(copied)) {
747 ret = ext4_get_inode_loc(inode, &iloc);
748 if (ret) {
749 unlock_page(page);
750 put_page(page);
751 ext4_std_error(inode->i_sb, ret);
752 goto out;
753 }
754 ext4_write_lock_xattr(inode, &no_expand);
755 BUG_ON(!ext4_has_inline_data(inode));
756
757 /*
758 * ei->i_inline_off may have changed since
759 * ext4_write_begin() called
760 * ext4_try_to_write_inline_data()
761 */
762 (void) ext4_find_inline_data_nolock(inode);
763
764 kaddr = kmap_atomic(page);
765 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
766 kunmap_atomic(kaddr);
767 SetPageUptodate(page);
768 /* clear page dirty so that writepages wouldn't work for us. */
769 ClearPageDirty(page);
770
771 ext4_write_unlock_xattr(inode, &no_expand);
772 brelse(iloc.bh);
773
774 /*
775 * It's important to update i_size while still holding page
776 * lock: page writeout could otherwise come in and zero
777 * beyond i_size.
778 */
779 ext4_update_inode_size(inode, pos + copied);
780 }
781 unlock_page(page);
782 put_page(page);
783
784 /*
785 * Don't mark the inode dirty under page lock. First, it unnecessarily
786 * makes the holding time of page lock longer. Second, it forces lock
787 * ordering of page lock and transaction start for journaling
788 * filesystems.
789 */
790 if (likely(copied))
791 mark_inode_dirty(inode);
792 out:
793 /*
794 * If we didn't copy as much data as expected, we need to trim back
795 * size of xattr containing inline data.
796 */
797 if (pos + len > inode->i_size && ext4_can_truncate(inode))
798 ext4_orphan_add(handle, inode);
799
800 ret2 = ext4_journal_stop(handle);
801 if (!ret)
802 ret = ret2;
803 if (pos + len > inode->i_size) {
804 ext4_truncate_failed_write(inode);
805 /*
806 * If truncate failed early the inode might still be
807 * on the orphan list; we need to make sure the inode
808 * is removed from the orphan list in that case.
809 */
810 if (inode->i_nlink)
811 ext4_orphan_del(NULL, inode);
812 }
813 return ret ? ret : copied;
814 }
815
816 struct buffer_head *
817 ext4_journalled_write_inline_data(struct inode *inode,
818 unsigned len,
819 struct page *page)
820 {
821 int ret, no_expand;
822 void *kaddr;
823 struct ext4_iloc iloc;
824
825 ret = ext4_get_inode_loc(inode, &iloc);
826 if (ret) {
827 ext4_std_error(inode->i_sb, ret);
828 return NULL;
829 }
830
831 ext4_write_lock_xattr(inode, &no_expand);
832 kaddr = kmap_atomic(page);
833 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
834 kunmap_atomic(kaddr);
835 ext4_write_unlock_xattr(inode, &no_expand);
836
837 return iloc.bh;
838 }
839
840 /*
841 * Try to make the page cache and handle ready for the inline data case.
842 * We can call this function in 2 cases:
843 * 1. The inode is created and the first write exceeds inline size. We can
844 * clear the inode state safely.
845 * 2. The inode has inline data, then we need to read the data, make it
846 * update and dirty so that ext4_da_writepages can handle it. We don't
847 * need to start the journal since the file's metadata isn't changed now.
848 */
849 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
850 struct inode *inode,
851 unsigned flags,
852 void **fsdata)
853 {
854 int ret = 0, inline_size;
855 struct page *page;
856
857 page = grab_cache_page_write_begin(mapping, 0, flags);
858 if (!page)
859 return -ENOMEM;
860
861 down_read(&EXT4_I(inode)->xattr_sem);
862 if (!ext4_has_inline_data(inode)) {
863 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
864 goto out;
865 }
866
867 inline_size = ext4_get_inline_size(inode);
868
869 if (!PageUptodate(page)) {
870 ret = ext4_read_inline_page(inode, page);
871 if (ret < 0)
872 goto out;
873 }
874
875 ret = __block_write_begin(page, 0, inline_size,
876 ext4_da_get_block_prep);
877 if (ret) {
878 up_read(&EXT4_I(inode)->xattr_sem);
879 unlock_page(page);
880 put_page(page);
881 ext4_truncate_failed_write(inode);
882 return ret;
883 }
884
885 SetPageDirty(page);
886 SetPageUptodate(page);
887 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
888 *fsdata = (void *)CONVERT_INLINE_DATA;
889
890 out:
891 up_read(&EXT4_I(inode)->xattr_sem);
892 if (page) {
893 unlock_page(page);
894 put_page(page);
895 }
896 return ret;
897 }
898
899 /*
900 * Prepare the write for the inline data.
901 * If the data can be written into the inode, we just read
902 * the page and make it uptodate, and start the journal.
903 * Otherwise read the page, makes it dirty so that it can be
904 * handle in writepages(the i_disksize update is left to the
905 * normal ext4_da_write_end).
906 */
907 int ext4_da_write_inline_data_begin(struct address_space *mapping,
908 struct inode *inode,
909 loff_t pos, unsigned len,
910 unsigned flags,
911 struct page **pagep,
912 void **fsdata)
913 {
914 int ret, inline_size;
915 handle_t *handle;
916 struct page *page;
917 struct ext4_iloc iloc;
918 int retries = 0;
919
920 ret = ext4_get_inode_loc(inode, &iloc);
921 if (ret)
922 return ret;
923
924 retry_journal:
925 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
926 if (IS_ERR(handle)) {
927 ret = PTR_ERR(handle);
928 goto out;
929 }
930
931 inline_size = ext4_get_max_inline_size(inode);
932
933 ret = -ENOSPC;
934 if (inline_size >= pos + len) {
935 ret = ext4_prepare_inline_data(handle, inode, pos + len);
936 if (ret && ret != -ENOSPC)
937 goto out_journal;
938 }
939
940 /*
941 * We cannot recurse into the filesystem as the transaction
942 * is already started.
943 */
944 flags |= AOP_FLAG_NOFS;
945
946 if (ret == -ENOSPC) {
947 ext4_journal_stop(handle);
948 ret = ext4_da_convert_inline_data_to_extent(mapping,
949 inode,
950 flags,
951 fsdata);
952 if (ret == -ENOSPC &&
953 ext4_should_retry_alloc(inode->i_sb, &retries))
954 goto retry_journal;
955 goto out;
956 }
957
958 page = grab_cache_page_write_begin(mapping, 0, flags);
959 if (!page) {
960 ret = -ENOMEM;
961 goto out_journal;
962 }
963
964 down_read(&EXT4_I(inode)->xattr_sem);
965 if (!ext4_has_inline_data(inode)) {
966 ret = 0;
967 goto out_release_page;
968 }
969
970 if (!PageUptodate(page)) {
971 ret = ext4_read_inline_page(inode, page);
972 if (ret < 0)
973 goto out_release_page;
974 }
975 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
976 EXT4_JTR_NONE);
977 if (ret)
978 goto out_release_page;
979
980 up_read(&EXT4_I(inode)->xattr_sem);
981 *pagep = page;
982 brelse(iloc.bh);
983 return 1;
984 out_release_page:
985 up_read(&EXT4_I(inode)->xattr_sem);
986 unlock_page(page);
987 put_page(page);
988 out_journal:
989 ext4_journal_stop(handle);
990 out:
991 brelse(iloc.bh);
992 return ret;
993 }
994
995 #ifdef INLINE_DIR_DEBUG
996 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
997 void *inline_start, int inline_size)
998 {
999 int offset;
1000 unsigned short de_len;
1001 struct ext4_dir_entry_2 *de = inline_start;
1002 void *dlimit = inline_start + inline_size;
1003
1004 trace_printk("inode %lu\n", dir->i_ino);
1005 offset = 0;
1006 while ((void *)de < dlimit) {
1007 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1008 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1009 offset, de_len, de->name_len, de->name,
1010 de->name_len, le32_to_cpu(de->inode));
1011 if (ext4_check_dir_entry(dir, NULL, de, bh,
1012 inline_start, inline_size, offset))
1013 BUG();
1014
1015 offset += de_len;
1016 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1017 }
1018 }
1019 #else
1020 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1021 #endif
1022
1023 /*
1024 * Add a new entry into a inline dir.
1025 * It will return -ENOSPC if no space is available, and -EIO
1026 * and -EEXIST if directory entry already exists.
1027 */
1028 static int ext4_add_dirent_to_inline(handle_t *handle,
1029 struct ext4_filename *fname,
1030 struct inode *dir,
1031 struct inode *inode,
1032 struct ext4_iloc *iloc,
1033 void *inline_start, int inline_size)
1034 {
1035 int err;
1036 struct ext4_dir_entry_2 *de;
1037
1038 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1039 inline_size, fname, &de);
1040 if (err)
1041 return err;
1042
1043 BUFFER_TRACE(iloc->bh, "get_write_access");
1044 err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1045 EXT4_JTR_NONE);
1046 if (err)
1047 return err;
1048 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1049
1050 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1051
1052 /*
1053 * XXX shouldn't update any times until successful
1054 * completion of syscall, but too many callers depend
1055 * on this.
1056 *
1057 * XXX similarly, too many callers depend on
1058 * ext4_new_inode() setting the times, but error
1059 * recovery deletes the inode, so the worst that can
1060 * happen is that the times are slightly out of date
1061 * and/or different from the directory change time.
1062 */
1063 dir->i_mtime = dir->i_ctime = current_time(dir);
1064 ext4_update_dx_flag(dir);
1065 inode_inc_iversion(dir);
1066 return 1;
1067 }
1068
1069 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1070 struct ext4_iloc *iloc)
1071 {
1072 struct ext4_xattr_entry *entry;
1073 struct ext4_xattr_ibody_header *header;
1074
1075 BUG_ON(!EXT4_I(inode)->i_inline_off);
1076
1077 header = IHDR(inode, ext4_raw_inode(iloc));
1078 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1079 EXT4_I(inode)->i_inline_off);
1080
1081 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1082 }
1083
1084 /* Set the final de to cover the whole block. */
1085 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1086 {
1087 struct ext4_dir_entry_2 *de, *prev_de;
1088 void *limit;
1089 int de_len;
1090
1091 de = (struct ext4_dir_entry_2 *)de_buf;
1092 if (old_size) {
1093 limit = de_buf + old_size;
1094 do {
1095 prev_de = de;
1096 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1097 de_buf += de_len;
1098 de = (struct ext4_dir_entry_2 *)de_buf;
1099 } while (de_buf < limit);
1100
1101 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1102 old_size, new_size);
1103 } else {
1104 /* this is just created, so create an empty entry. */
1105 de->inode = 0;
1106 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1107 }
1108 }
1109
1110 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1111 struct ext4_iloc *iloc)
1112 {
1113 int ret;
1114 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1115 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1116
1117 if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1118 return -ENOSPC;
1119
1120 ret = ext4_update_inline_data(handle, dir,
1121 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1122 if (ret)
1123 return ret;
1124
1125 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1126 EXT4_I(dir)->i_inline_size -
1127 EXT4_MIN_INLINE_DATA_SIZE);
1128 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1129 return 0;
1130 }
1131
1132 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1133 struct ext4_iloc *iloc,
1134 void *buf, int inline_size)
1135 {
1136 int ret;
1137
1138 ret = ext4_create_inline_data(handle, inode, inline_size);
1139 if (ret) {
1140 ext4_msg(inode->i_sb, KERN_EMERG,
1141 "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1142 inode->i_ino, ret);
1143 return;
1144 }
1145 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1146 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1147 }
1148
1149 static int ext4_finish_convert_inline_dir(handle_t *handle,
1150 struct inode *inode,
1151 struct buffer_head *dir_block,
1152 void *buf,
1153 int inline_size)
1154 {
1155 int err, csum_size = 0, header_size = 0;
1156 struct ext4_dir_entry_2 *de;
1157 void *target = dir_block->b_data;
1158
1159 /*
1160 * First create "." and ".." and then copy the dir information
1161 * back to the block.
1162 */
1163 de = (struct ext4_dir_entry_2 *)target;
1164 de = ext4_init_dot_dotdot(inode, de,
1165 inode->i_sb->s_blocksize, csum_size,
1166 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1167 header_size = (void *)de - target;
1168
1169 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1170 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1171
1172 if (ext4_has_metadata_csum(inode->i_sb))
1173 csum_size = sizeof(struct ext4_dir_entry_tail);
1174
1175 inode->i_size = inode->i_sb->s_blocksize;
1176 i_size_write(inode, inode->i_sb->s_blocksize);
1177 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1178 ext4_update_final_de(dir_block->b_data,
1179 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1180 inode->i_sb->s_blocksize - csum_size);
1181
1182 if (csum_size)
1183 ext4_initialize_dirent_tail(dir_block,
1184 inode->i_sb->s_blocksize);
1185 set_buffer_uptodate(dir_block);
1186 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1187 if (err)
1188 return err;
1189 set_buffer_verified(dir_block);
1190 return ext4_mark_inode_dirty(handle, inode);
1191 }
1192
1193 static int ext4_convert_inline_data_nolock(handle_t *handle,
1194 struct inode *inode,
1195 struct ext4_iloc *iloc)
1196 {
1197 int error;
1198 void *buf = NULL;
1199 struct buffer_head *data_bh = NULL;
1200 struct ext4_map_blocks map;
1201 int inline_size;
1202
1203 inline_size = ext4_get_inline_size(inode);
1204 buf = kmalloc(inline_size, GFP_NOFS);
1205 if (!buf) {
1206 error = -ENOMEM;
1207 goto out;
1208 }
1209
1210 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1211 if (error < 0)
1212 goto out;
1213
1214 /*
1215 * Make sure the inline directory entries pass checks before we try to
1216 * convert them, so that we avoid touching stuff that needs fsck.
1217 */
1218 if (S_ISDIR(inode->i_mode)) {
1219 error = ext4_check_all_de(inode, iloc->bh,
1220 buf + EXT4_INLINE_DOTDOT_SIZE,
1221 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1222 if (error)
1223 goto out;
1224 }
1225
1226 error = ext4_destroy_inline_data_nolock(handle, inode);
1227 if (error)
1228 goto out;
1229
1230 map.m_lblk = 0;
1231 map.m_len = 1;
1232 map.m_flags = 0;
1233 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1234 if (error < 0)
1235 goto out_restore;
1236 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1237 error = -EIO;
1238 goto out_restore;
1239 }
1240
1241 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1242 if (!data_bh) {
1243 error = -ENOMEM;
1244 goto out_restore;
1245 }
1246
1247 lock_buffer(data_bh);
1248 error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1249 EXT4_JTR_NONE);
1250 if (error) {
1251 unlock_buffer(data_bh);
1252 error = -EIO;
1253 goto out_restore;
1254 }
1255 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1256
1257 if (!S_ISDIR(inode->i_mode)) {
1258 memcpy(data_bh->b_data, buf, inline_size);
1259 set_buffer_uptodate(data_bh);
1260 error = ext4_handle_dirty_metadata(handle,
1261 inode, data_bh);
1262 } else {
1263 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1264 buf, inline_size);
1265 }
1266
1267 unlock_buffer(data_bh);
1268 out_restore:
1269 if (error)
1270 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1271
1272 out:
1273 brelse(data_bh);
1274 kfree(buf);
1275 return error;
1276 }
1277
1278 /*
1279 * Try to add the new entry to the inline data.
1280 * If succeeds, return 0. If not, extended the inline dir and copied data to
1281 * the new created block.
1282 */
1283 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1284 struct inode *dir, struct inode *inode)
1285 {
1286 int ret, ret2, inline_size, no_expand;
1287 void *inline_start;
1288 struct ext4_iloc iloc;
1289
1290 ret = ext4_get_inode_loc(dir, &iloc);
1291 if (ret)
1292 return ret;
1293
1294 ext4_write_lock_xattr(dir, &no_expand);
1295 if (!ext4_has_inline_data(dir))
1296 goto out;
1297
1298 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1299 EXT4_INLINE_DOTDOT_SIZE;
1300 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1301
1302 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1303 inline_start, inline_size);
1304 if (ret != -ENOSPC)
1305 goto out;
1306
1307 /* check whether it can be inserted to inline xattr space. */
1308 inline_size = EXT4_I(dir)->i_inline_size -
1309 EXT4_MIN_INLINE_DATA_SIZE;
1310 if (!inline_size) {
1311 /* Try to use the xattr space.*/
1312 ret = ext4_update_inline_dir(handle, dir, &iloc);
1313 if (ret && ret != -ENOSPC)
1314 goto out;
1315
1316 inline_size = EXT4_I(dir)->i_inline_size -
1317 EXT4_MIN_INLINE_DATA_SIZE;
1318 }
1319
1320 if (inline_size) {
1321 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1322
1323 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1324 inode, &iloc, inline_start,
1325 inline_size);
1326
1327 if (ret != -ENOSPC)
1328 goto out;
1329 }
1330
1331 /*
1332 * The inline space is filled up, so create a new block for it.
1333 * As the extent tree will be created, we have to save the inline
1334 * dir first.
1335 */
1336 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1337
1338 out:
1339 ext4_write_unlock_xattr(dir, &no_expand);
1340 ret2 = ext4_mark_inode_dirty(handle, dir);
1341 if (unlikely(ret2 && !ret))
1342 ret = ret2;
1343 brelse(iloc.bh);
1344 return ret;
1345 }
1346
1347 /*
1348 * This function fills a red-black tree with information from an
1349 * inlined dir. It returns the number directory entries loaded
1350 * into the tree. If there is an error it is returned in err.
1351 */
1352 int ext4_inlinedir_to_tree(struct file *dir_file,
1353 struct inode *dir, ext4_lblk_t block,
1354 struct dx_hash_info *hinfo,
1355 __u32 start_hash, __u32 start_minor_hash,
1356 int *has_inline_data)
1357 {
1358 int err = 0, count = 0;
1359 unsigned int parent_ino;
1360 int pos;
1361 struct ext4_dir_entry_2 *de;
1362 struct inode *inode = file_inode(dir_file);
1363 int ret, inline_size = 0;
1364 struct ext4_iloc iloc;
1365 void *dir_buf = NULL;
1366 struct ext4_dir_entry_2 fake;
1367 struct fscrypt_str tmp_str;
1368
1369 ret = ext4_get_inode_loc(inode, &iloc);
1370 if (ret)
1371 return ret;
1372
1373 down_read(&EXT4_I(inode)->xattr_sem);
1374 if (!ext4_has_inline_data(inode)) {
1375 up_read(&EXT4_I(inode)->xattr_sem);
1376 *has_inline_data = 0;
1377 goto out;
1378 }
1379
1380 inline_size = ext4_get_inline_size(inode);
1381 dir_buf = kmalloc(inline_size, GFP_NOFS);
1382 if (!dir_buf) {
1383 ret = -ENOMEM;
1384 up_read(&EXT4_I(inode)->xattr_sem);
1385 goto out;
1386 }
1387
1388 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1389 up_read(&EXT4_I(inode)->xattr_sem);
1390 if (ret < 0)
1391 goto out;
1392
1393 pos = 0;
1394 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1395 while (pos < inline_size) {
1396 /*
1397 * As inlined dir doesn't store any information about '.' and
1398 * only the inode number of '..' is stored, we have to handle
1399 * them differently.
1400 */
1401 if (pos == 0) {
1402 fake.inode = cpu_to_le32(inode->i_ino);
1403 fake.name_len = 1;
1404 strcpy(fake.name, ".");
1405 fake.rec_len = ext4_rec_len_to_disk(
1406 ext4_dir_rec_len(fake.name_len, NULL),
1407 inline_size);
1408 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1409 de = &fake;
1410 pos = EXT4_INLINE_DOTDOT_OFFSET;
1411 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1412 fake.inode = cpu_to_le32(parent_ino);
1413 fake.name_len = 2;
1414 strcpy(fake.name, "..");
1415 fake.rec_len = ext4_rec_len_to_disk(
1416 ext4_dir_rec_len(fake.name_len, NULL),
1417 inline_size);
1418 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1419 de = &fake;
1420 pos = EXT4_INLINE_DOTDOT_SIZE;
1421 } else {
1422 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1423 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1424 if (ext4_check_dir_entry(inode, dir_file, de,
1425 iloc.bh, dir_buf,
1426 inline_size, pos)) {
1427 ret = count;
1428 goto out;
1429 }
1430 }
1431
1432 if (ext4_hash_in_dirent(dir)) {
1433 hinfo->hash = EXT4_DIRENT_HASH(de);
1434 hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1435 } else {
1436 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1437 }
1438 if ((hinfo->hash < start_hash) ||
1439 ((hinfo->hash == start_hash) &&
1440 (hinfo->minor_hash < start_minor_hash)))
1441 continue;
1442 if (de->inode == 0)
1443 continue;
1444 tmp_str.name = de->name;
1445 tmp_str.len = de->name_len;
1446 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1447 hinfo->minor_hash, de, &tmp_str);
1448 if (err) {
1449 ret = err;
1450 goto out;
1451 }
1452 count++;
1453 }
1454 ret = count;
1455 out:
1456 kfree(dir_buf);
1457 brelse(iloc.bh);
1458 return ret;
1459 }
1460
1461 /*
1462 * So this function is called when the volume is mkfsed with
1463 * dir_index disabled. In order to keep f_pos persistent
1464 * after we convert from an inlined dir to a blocked based,
1465 * we just pretend that we are a normal dir and return the
1466 * offset as if '.' and '..' really take place.
1467 *
1468 */
1469 int ext4_read_inline_dir(struct file *file,
1470 struct dir_context *ctx,
1471 int *has_inline_data)
1472 {
1473 unsigned int offset, parent_ino;
1474 int i;
1475 struct ext4_dir_entry_2 *de;
1476 struct super_block *sb;
1477 struct inode *inode = file_inode(file);
1478 int ret, inline_size = 0;
1479 struct ext4_iloc iloc;
1480 void *dir_buf = NULL;
1481 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1482
1483 ret = ext4_get_inode_loc(inode, &iloc);
1484 if (ret)
1485 return ret;
1486
1487 down_read(&EXT4_I(inode)->xattr_sem);
1488 if (!ext4_has_inline_data(inode)) {
1489 up_read(&EXT4_I(inode)->xattr_sem);
1490 *has_inline_data = 0;
1491 goto out;
1492 }
1493
1494 inline_size = ext4_get_inline_size(inode);
1495 dir_buf = kmalloc(inline_size, GFP_NOFS);
1496 if (!dir_buf) {
1497 ret = -ENOMEM;
1498 up_read(&EXT4_I(inode)->xattr_sem);
1499 goto out;
1500 }
1501
1502 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1503 up_read(&EXT4_I(inode)->xattr_sem);
1504 if (ret < 0)
1505 goto out;
1506
1507 ret = 0;
1508 sb = inode->i_sb;
1509 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1510 offset = ctx->pos;
1511
1512 /*
1513 * dotdot_offset and dotdot_size is the real offset and
1514 * size for ".." and "." if the dir is block based while
1515 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1516 * So we will use extra_offset and extra_size to indicate them
1517 * during the inline dir iteration.
1518 */
1519 dotdot_offset = ext4_dir_rec_len(1, NULL);
1520 dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1521 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1522 extra_size = extra_offset + inline_size;
1523
1524 /*
1525 * If the version has changed since the last call to
1526 * readdir(2), then we might be pointing to an invalid
1527 * dirent right now. Scan from the start of the inline
1528 * dir to make sure.
1529 */
1530 if (!inode_eq_iversion(inode, file->f_version)) {
1531 for (i = 0; i < extra_size && i < offset;) {
1532 /*
1533 * "." is with offset 0 and
1534 * ".." is dotdot_offset.
1535 */
1536 if (!i) {
1537 i = dotdot_offset;
1538 continue;
1539 } else if (i == dotdot_offset) {
1540 i = dotdot_size;
1541 continue;
1542 }
1543 /* for other entry, the real offset in
1544 * the buf has to be tuned accordingly.
1545 */
1546 de = (struct ext4_dir_entry_2 *)
1547 (dir_buf + i - extra_offset);
1548 /* It's too expensive to do a full
1549 * dirent test each time round this
1550 * loop, but we do have to test at
1551 * least that it is non-zero. A
1552 * failure will be detected in the
1553 * dirent test below. */
1554 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1555 < ext4_dir_rec_len(1, NULL))
1556 break;
1557 i += ext4_rec_len_from_disk(de->rec_len,
1558 extra_size);
1559 }
1560 offset = i;
1561 ctx->pos = offset;
1562 file->f_version = inode_query_iversion(inode);
1563 }
1564
1565 while (ctx->pos < extra_size) {
1566 if (ctx->pos == 0) {
1567 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1568 goto out;
1569 ctx->pos = dotdot_offset;
1570 continue;
1571 }
1572
1573 if (ctx->pos == dotdot_offset) {
1574 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1575 goto out;
1576 ctx->pos = dotdot_size;
1577 continue;
1578 }
1579
1580 de = (struct ext4_dir_entry_2 *)
1581 (dir_buf + ctx->pos - extra_offset);
1582 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1583 extra_size, ctx->pos))
1584 goto out;
1585 if (le32_to_cpu(de->inode)) {
1586 if (!dir_emit(ctx, de->name, de->name_len,
1587 le32_to_cpu(de->inode),
1588 get_dtype(sb, de->file_type)))
1589 goto out;
1590 }
1591 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1592 }
1593 out:
1594 kfree(dir_buf);
1595 brelse(iloc.bh);
1596 return ret;
1597 }
1598
1599 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1600 struct ext4_dir_entry_2 **parent_de,
1601 int *retval)
1602 {
1603 struct ext4_iloc iloc;
1604
1605 *retval = ext4_get_inode_loc(inode, &iloc);
1606 if (*retval)
1607 return NULL;
1608
1609 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1610
1611 return iloc.bh;
1612 }
1613
1614 /*
1615 * Try to create the inline data for the new dir.
1616 * If it succeeds, return 0, otherwise return the error.
1617 * In case of ENOSPC, the caller should create the normal disk layout dir.
1618 */
1619 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1620 struct inode *inode)
1621 {
1622 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1623 struct ext4_iloc iloc;
1624 struct ext4_dir_entry_2 *de;
1625
1626 ret = ext4_get_inode_loc(inode, &iloc);
1627 if (ret)
1628 return ret;
1629
1630 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1631 if (ret)
1632 goto out;
1633
1634 /*
1635 * For inline dir, we only save the inode information for the ".."
1636 * and create a fake dentry to cover the left space.
1637 */
1638 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1639 de->inode = cpu_to_le32(parent->i_ino);
1640 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1641 de->inode = 0;
1642 de->rec_len = ext4_rec_len_to_disk(
1643 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1644 inline_size);
1645 set_nlink(inode, 2);
1646 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1647 out:
1648 brelse(iloc.bh);
1649 return ret;
1650 }
1651
1652 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1653 struct ext4_filename *fname,
1654 struct ext4_dir_entry_2 **res_dir,
1655 int *has_inline_data)
1656 {
1657 int ret;
1658 struct ext4_iloc iloc;
1659 void *inline_start;
1660 int inline_size;
1661
1662 if (ext4_get_inode_loc(dir, &iloc))
1663 return NULL;
1664
1665 down_read(&EXT4_I(dir)->xattr_sem);
1666 if (!ext4_has_inline_data(dir)) {
1667 *has_inline_data = 0;
1668 goto out;
1669 }
1670
1671 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1672 EXT4_INLINE_DOTDOT_SIZE;
1673 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1674 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1675 dir, fname, 0, res_dir);
1676 if (ret == 1)
1677 goto out_find;
1678 if (ret < 0)
1679 goto out;
1680
1681 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1682 goto out;
1683
1684 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1685 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1686
1687 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1688 dir, fname, 0, res_dir);
1689 if (ret == 1)
1690 goto out_find;
1691
1692 out:
1693 brelse(iloc.bh);
1694 iloc.bh = NULL;
1695 out_find:
1696 up_read(&EXT4_I(dir)->xattr_sem);
1697 return iloc.bh;
1698 }
1699
1700 int ext4_delete_inline_entry(handle_t *handle,
1701 struct inode *dir,
1702 struct ext4_dir_entry_2 *de_del,
1703 struct buffer_head *bh,
1704 int *has_inline_data)
1705 {
1706 int err, inline_size, no_expand;
1707 struct ext4_iloc iloc;
1708 void *inline_start;
1709
1710 err = ext4_get_inode_loc(dir, &iloc);
1711 if (err)
1712 return err;
1713
1714 ext4_write_lock_xattr(dir, &no_expand);
1715 if (!ext4_has_inline_data(dir)) {
1716 *has_inline_data = 0;
1717 goto out;
1718 }
1719
1720 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1721 EXT4_MIN_INLINE_DATA_SIZE) {
1722 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1723 EXT4_INLINE_DOTDOT_SIZE;
1724 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1725 EXT4_INLINE_DOTDOT_SIZE;
1726 } else {
1727 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1728 inline_size = ext4_get_inline_size(dir) -
1729 EXT4_MIN_INLINE_DATA_SIZE;
1730 }
1731
1732 BUFFER_TRACE(bh, "get_write_access");
1733 err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1734 EXT4_JTR_NONE);
1735 if (err)
1736 goto out;
1737
1738 err = ext4_generic_delete_entry(dir, de_del, bh,
1739 inline_start, inline_size, 0);
1740 if (err)
1741 goto out;
1742
1743 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1744 out:
1745 ext4_write_unlock_xattr(dir, &no_expand);
1746 if (likely(err == 0))
1747 err = ext4_mark_inode_dirty(handle, dir);
1748 brelse(iloc.bh);
1749 if (err != -ENOENT)
1750 ext4_std_error(dir->i_sb, err);
1751 return err;
1752 }
1753
1754 /*
1755 * Get the inline dentry at offset.
1756 */
1757 static inline struct ext4_dir_entry_2 *
1758 ext4_get_inline_entry(struct inode *inode,
1759 struct ext4_iloc *iloc,
1760 unsigned int offset,
1761 void **inline_start,
1762 int *inline_size)
1763 {
1764 void *inline_pos;
1765
1766 BUG_ON(offset > ext4_get_inline_size(inode));
1767
1768 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1769 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1770 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1771 } else {
1772 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1773 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1774 *inline_size = ext4_get_inline_size(inode) -
1775 EXT4_MIN_INLINE_DATA_SIZE;
1776 }
1777
1778 if (inline_start)
1779 *inline_start = inline_pos;
1780 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1781 }
1782
1783 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1784 {
1785 int err, inline_size;
1786 struct ext4_iloc iloc;
1787 size_t inline_len;
1788 void *inline_pos;
1789 unsigned int offset;
1790 struct ext4_dir_entry_2 *de;
1791 bool ret = true;
1792
1793 err = ext4_get_inode_loc(dir, &iloc);
1794 if (err) {
1795 EXT4_ERROR_INODE_ERR(dir, -err,
1796 "error %d getting inode %lu block",
1797 err, dir->i_ino);
1798 return true;
1799 }
1800
1801 down_read(&EXT4_I(dir)->xattr_sem);
1802 if (!ext4_has_inline_data(dir)) {
1803 *has_inline_data = 0;
1804 goto out;
1805 }
1806
1807 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1808 if (!le32_to_cpu(de->inode)) {
1809 ext4_warning(dir->i_sb,
1810 "bad inline directory (dir #%lu) - no `..'",
1811 dir->i_ino);
1812 ret = true;
1813 goto out;
1814 }
1815
1816 inline_len = ext4_get_inline_size(dir);
1817 offset = EXT4_INLINE_DOTDOT_SIZE;
1818 while (offset < inline_len) {
1819 de = ext4_get_inline_entry(dir, &iloc, offset,
1820 &inline_pos, &inline_size);
1821 if (ext4_check_dir_entry(dir, NULL, de,
1822 iloc.bh, inline_pos,
1823 inline_size, offset)) {
1824 ext4_warning(dir->i_sb,
1825 "bad inline directory (dir #%lu) - "
1826 "inode %u, rec_len %u, name_len %d"
1827 "inline size %d",
1828 dir->i_ino, le32_to_cpu(de->inode),
1829 le16_to_cpu(de->rec_len), de->name_len,
1830 inline_size);
1831 ret = true;
1832 goto out;
1833 }
1834 if (le32_to_cpu(de->inode)) {
1835 ret = false;
1836 goto out;
1837 }
1838 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1839 }
1840
1841 out:
1842 up_read(&EXT4_I(dir)->xattr_sem);
1843 brelse(iloc.bh);
1844 return ret;
1845 }
1846
1847 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1848 {
1849 int ret, no_expand;
1850
1851 ext4_write_lock_xattr(inode, &no_expand);
1852 ret = ext4_destroy_inline_data_nolock(handle, inode);
1853 ext4_write_unlock_xattr(inode, &no_expand);
1854
1855 return ret;
1856 }
1857
1858 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1859 {
1860 __u64 addr;
1861 int error = -EAGAIN;
1862 struct ext4_iloc iloc;
1863
1864 down_read(&EXT4_I(inode)->xattr_sem);
1865 if (!ext4_has_inline_data(inode))
1866 goto out;
1867
1868 error = ext4_get_inode_loc(inode, &iloc);
1869 if (error)
1870 goto out;
1871
1872 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1873 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1874 addr += offsetof(struct ext4_inode, i_block);
1875
1876 brelse(iloc.bh);
1877
1878 iomap->addr = addr;
1879 iomap->offset = 0;
1880 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1881 i_size_read(inode));
1882 iomap->type = IOMAP_INLINE;
1883 iomap->flags = 0;
1884
1885 out:
1886 up_read(&EXT4_I(inode)->xattr_sem);
1887 return error;
1888 }
1889
1890 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1891 {
1892 handle_t *handle;
1893 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1894 size_t i_size;
1895 void *value = NULL;
1896 struct ext4_xattr_ibody_find is = {
1897 .s = { .not_found = -ENODATA, },
1898 };
1899 struct ext4_xattr_info i = {
1900 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1901 .name = EXT4_XATTR_SYSTEM_DATA,
1902 };
1903
1904
1905 needed_blocks = ext4_writepage_trans_blocks(inode);
1906 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1907 if (IS_ERR(handle))
1908 return PTR_ERR(handle);
1909
1910 ext4_write_lock_xattr(inode, &no_expand);
1911 if (!ext4_has_inline_data(inode)) {
1912 ext4_write_unlock_xattr(inode, &no_expand);
1913 *has_inline = 0;
1914 ext4_journal_stop(handle);
1915 return 0;
1916 }
1917
1918 if ((err = ext4_orphan_add(handle, inode)) != 0)
1919 goto out;
1920
1921 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1922 goto out;
1923
1924 down_write(&EXT4_I(inode)->i_data_sem);
1925 i_size = inode->i_size;
1926 inline_size = ext4_get_inline_size(inode);
1927 EXT4_I(inode)->i_disksize = i_size;
1928
1929 if (i_size < inline_size) {
1930 /*
1931 * if there's inline data to truncate and this file was
1932 * converted to extents after that inline data was written,
1933 * the extent status cache must be cleared to avoid leaving
1934 * behind stale delayed allocated extent entries
1935 */
1936 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1937 retry:
1938 err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1939 if (err == -ENOMEM) {
1940 cond_resched();
1941 congestion_wait(BLK_RW_ASYNC, HZ/50);
1942 goto retry;
1943 }
1944 if (err)
1945 goto out_error;
1946 }
1947
1948 /* Clear the content in the xattr space. */
1949 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1950 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1951 goto out_error;
1952
1953 BUG_ON(is.s.not_found);
1954
1955 value_len = le32_to_cpu(is.s.here->e_value_size);
1956 value = kmalloc(value_len, GFP_NOFS);
1957 if (!value) {
1958 err = -ENOMEM;
1959 goto out_error;
1960 }
1961
1962 err = ext4_xattr_ibody_get(inode, i.name_index,
1963 i.name, value, value_len);
1964 if (err <= 0)
1965 goto out_error;
1966
1967 i.value = value;
1968 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1969 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1970 err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1971 if (err)
1972 goto out_error;
1973 }
1974
1975 /* Clear the content within i_blocks. */
1976 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1977 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1978 memset(p + i_size, 0,
1979 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1980 }
1981
1982 EXT4_I(inode)->i_inline_size = i_size <
1983 EXT4_MIN_INLINE_DATA_SIZE ?
1984 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1985 }
1986
1987 out_error:
1988 up_write(&EXT4_I(inode)->i_data_sem);
1989 out:
1990 brelse(is.iloc.bh);
1991 ext4_write_unlock_xattr(inode, &no_expand);
1992 kfree(value);
1993 if (inode->i_nlink)
1994 ext4_orphan_del(handle, inode);
1995
1996 if (err == 0) {
1997 inode->i_mtime = inode->i_ctime = current_time(inode);
1998 err = ext4_mark_inode_dirty(handle, inode);
1999 if (IS_SYNC(inode))
2000 ext4_handle_sync(handle);
2001 }
2002 ext4_journal_stop(handle);
2003 return err;
2004 }
2005
2006 int ext4_convert_inline_data(struct inode *inode)
2007 {
2008 int error, needed_blocks, no_expand;
2009 handle_t *handle;
2010 struct ext4_iloc iloc;
2011
2012 if (!ext4_has_inline_data(inode)) {
2013 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2014 return 0;
2015 }
2016
2017 needed_blocks = ext4_writepage_trans_blocks(inode);
2018
2019 iloc.bh = NULL;
2020 error = ext4_get_inode_loc(inode, &iloc);
2021 if (error)
2022 return error;
2023
2024 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2025 if (IS_ERR(handle)) {
2026 error = PTR_ERR(handle);
2027 goto out_free;
2028 }
2029
2030 ext4_write_lock_xattr(inode, &no_expand);
2031 if (ext4_has_inline_data(inode))
2032 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2033 ext4_write_unlock_xattr(inode, &no_expand);
2034 ext4_journal_stop(handle);
2035 out_free:
2036 brelse(iloc.bh);
2037 return error;
2038 }
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