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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
11#include "ext4_jbd2.h"
12#include "ext4.h"
13#include "xattr.h"
14#include "truncate.h"
15
16#define EXT4_XATTR_SYSTEM_DATA "data"
17#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
18#define EXT4_INLINE_DOTDOT_OFFSET 2
19#define EXT4_INLINE_DOTDOT_SIZE 4
20
21static int ext4_get_inline_size(struct inode *inode)
22{
23 if (EXT4_I(inode)->i_inline_off)
24 return EXT4_I(inode)->i_inline_size;
25
26 return 0;
27}
28
29static int get_max_inline_xattr_value_size(struct inode *inode,
30 struct ext4_iloc *iloc)
31{
32 struct ext4_xattr_ibody_header *header;
33 struct ext4_xattr_entry *entry;
34 struct ext4_inode *raw_inode;
35 int free, min_offs;
36
37 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
38 EXT4_GOOD_OLD_INODE_SIZE -
39 EXT4_I(inode)->i_extra_isize -
40 sizeof(struct ext4_xattr_ibody_header);
41
42 /*
43 * We need to subtract another sizeof(__u32) since an in-inode xattr
44 * needs an empty 4 bytes to indicate the gap between the xattr entry
45 * and the name/value pair.
46 */
47 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
48 return EXT4_XATTR_SIZE(min_offs -
49 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
50 EXT4_XATTR_ROUND - sizeof(__u32));
51
52 raw_inode = ext4_raw_inode(iloc);
53 header = IHDR(inode, raw_inode);
54 entry = IFIRST(header);
55
56 /* Compute min_offs. */
57 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
58 if (!entry->e_value_inum && entry->e_value_size) {
59 size_t offs = le16_to_cpu(entry->e_value_offs);
60 if (offs < min_offs)
61 min_offs = offs;
62 }
63 }
64 free = min_offs -
65 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
66
67 if (EXT4_I(inode)->i_inline_off) {
68 entry = (struct ext4_xattr_entry *)
69 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
70
71 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
72 goto out;
73 }
74
75 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
76
77 if (free > EXT4_XATTR_ROUND)
78 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
79 else
80 free = 0;
81
82out:
83 return free;
84}
85
86/*
87 * Get the maximum size we now can store in an inode.
88 * If we can't find the space for a xattr entry, don't use the space
89 * of the extents since we have no space to indicate the inline data.
90 */
91int ext4_get_max_inline_size(struct inode *inode)
92{
93 int error, max_inline_size;
94 struct ext4_iloc iloc;
95
96 if (EXT4_I(inode)->i_extra_isize == 0)
97 return 0;
98
99 error = ext4_get_inode_loc(inode, &iloc);
100 if (error) {
101 ext4_error_inode(inode, __func__, __LINE__, 0,
102 "can't get inode location %lu",
103 inode->i_ino);
104 return 0;
105 }
106
107 down_read(&EXT4_I(inode)->xattr_sem);
108 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
109 up_read(&EXT4_I(inode)->xattr_sem);
110
111 brelse(iloc.bh);
112
113 if (!max_inline_size)
114 return 0;
115
116 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
117}
118
119/*
120 * this function does not take xattr_sem, which is OK because it is
121 * currently only used in a code path coming form ext4_iget, before
122 * the new inode has been unlocked
123 */
124int ext4_find_inline_data_nolock(struct inode *inode)
125{
126 struct ext4_xattr_ibody_find is = {
127 .s = { .not_found = -ENODATA, },
128 };
129 struct ext4_xattr_info i = {
130 .name_index = EXT4_XATTR_INDEX_SYSTEM,
131 .name = EXT4_XATTR_SYSTEM_DATA,
132 };
133 int error;
134
135 if (EXT4_I(inode)->i_extra_isize == 0)
136 return 0;
137
138 error = ext4_get_inode_loc(inode, &is.iloc);
139 if (error)
140 return error;
141
142 error = ext4_xattr_ibody_find(inode, &i, &is);
143 if (error)
144 goto out;
145
146 if (!is.s.not_found) {
147 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
148 (void *)ext4_raw_inode(&is.iloc));
149 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
150 le32_to_cpu(is.s.here->e_value_size);
151 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
152 }
153out:
154 brelse(is.iloc.bh);
155 return error;
156}
157
158static int ext4_read_inline_data(struct inode *inode, void *buffer,
159 unsigned int len,
160 struct ext4_iloc *iloc)
161{
162 struct ext4_xattr_entry *entry;
163 struct ext4_xattr_ibody_header *header;
164 int cp_len = 0;
165 struct ext4_inode *raw_inode;
166
167 if (!len)
168 return 0;
169
170 BUG_ON(len > EXT4_I(inode)->i_inline_size);
171
172 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
173 len : EXT4_MIN_INLINE_DATA_SIZE;
174
175 raw_inode = ext4_raw_inode(iloc);
176 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
177
178 len -= cp_len;
179 buffer += cp_len;
180
181 if (!len)
182 goto out;
183
184 header = IHDR(inode, raw_inode);
185 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
186 EXT4_I(inode)->i_inline_off);
187 len = min_t(unsigned int, len,
188 (unsigned int)le32_to_cpu(entry->e_value_size));
189
190 memcpy(buffer,
191 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
192 cp_len += len;
193
194out:
195 return cp_len;
196}
197
198/*
199 * write the buffer to the inline inode.
200 * If 'create' is set, we don't need to do the extra copy in the xattr
201 * value since it is already handled by ext4_xattr_ibody_inline_set.
202 * That saves us one memcpy.
203 */
204static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
205 void *buffer, loff_t pos, unsigned int len)
206{
207 struct ext4_xattr_entry *entry;
208 struct ext4_xattr_ibody_header *header;
209 struct ext4_inode *raw_inode;
210 int cp_len = 0;
211
212 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
213 return;
214
215 BUG_ON(!EXT4_I(inode)->i_inline_off);
216 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
217
218 raw_inode = ext4_raw_inode(iloc);
219 buffer += pos;
220
221 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
222 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
223 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
224 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
225
226 len -= cp_len;
227 buffer += cp_len;
228 pos += cp_len;
229 }
230
231 if (!len)
232 return;
233
234 pos -= EXT4_MIN_INLINE_DATA_SIZE;
235 header = IHDR(inode, raw_inode);
236 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
237 EXT4_I(inode)->i_inline_off);
238
239 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
240 buffer, len);
241}
242
243static int ext4_create_inline_data(handle_t *handle,
244 struct inode *inode, unsigned len)
245{
246 int error;
247 void *value = NULL;
248 struct ext4_xattr_ibody_find is = {
249 .s = { .not_found = -ENODATA, },
250 };
251 struct ext4_xattr_info i = {
252 .name_index = EXT4_XATTR_INDEX_SYSTEM,
253 .name = EXT4_XATTR_SYSTEM_DATA,
254 };
255
256 error = ext4_get_inode_loc(inode, &is.iloc);
257 if (error)
258 return error;
259
260 BUFFER_TRACE(is.iloc.bh, "get_write_access");
261 error = ext4_journal_get_write_access(handle, is.iloc.bh);
262 if (error)
263 goto out;
264
265 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
266 value = EXT4_ZERO_XATTR_VALUE;
267 len -= EXT4_MIN_INLINE_DATA_SIZE;
268 } else {
269 value = "";
270 len = 0;
271 }
272
273 /* Insert the the xttr entry. */
274 i.value = value;
275 i.value_len = len;
276
277 error = ext4_xattr_ibody_find(inode, &i, &is);
278 if (error)
279 goto out;
280
281 BUG_ON(!is.s.not_found);
282
283 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
284 if (error) {
285 if (error == -ENOSPC)
286 ext4_clear_inode_state(inode,
287 EXT4_STATE_MAY_INLINE_DATA);
288 goto out;
289 }
290
291 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
292 0, EXT4_MIN_INLINE_DATA_SIZE);
293
294 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
295 (void *)ext4_raw_inode(&is.iloc));
296 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
297 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
298 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
299 get_bh(is.iloc.bh);
300 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
301
302out:
303 brelse(is.iloc.bh);
304 return error;
305}
306
307static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
308 unsigned int len)
309{
310 int error;
311 void *value = NULL;
312 struct ext4_xattr_ibody_find is = {
313 .s = { .not_found = -ENODATA, },
314 };
315 struct ext4_xattr_info i = {
316 .name_index = EXT4_XATTR_INDEX_SYSTEM,
317 .name = EXT4_XATTR_SYSTEM_DATA,
318 };
319
320 /* If the old space is ok, write the data directly. */
321 if (len <= EXT4_I(inode)->i_inline_size)
322 return 0;
323
324 error = ext4_get_inode_loc(inode, &is.iloc);
325 if (error)
326 return error;
327
328 error = ext4_xattr_ibody_find(inode, &i, &is);
329 if (error)
330 goto out;
331
332 BUG_ON(is.s.not_found);
333
334 len -= EXT4_MIN_INLINE_DATA_SIZE;
335 value = kzalloc(len, GFP_NOFS);
336 if (!value) {
337 error = -ENOMEM;
338 goto out;
339 }
340
341 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
342 value, len);
343 if (error == -ENODATA)
344 goto out;
345
346 BUFFER_TRACE(is.iloc.bh, "get_write_access");
347 error = ext4_journal_get_write_access(handle, is.iloc.bh);
348 if (error)
349 goto out;
350
351 /* Update the xttr entry. */
352 i.value = value;
353 i.value_len = len;
354
355 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
356 if (error)
357 goto out;
358
359 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
360 (void *)ext4_raw_inode(&is.iloc));
361 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
362 le32_to_cpu(is.s.here->e_value_size);
363 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
364 get_bh(is.iloc.bh);
365 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
366
367out:
368 kfree(value);
369 brelse(is.iloc.bh);
370 return error;
371}
372
373static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
374 unsigned int len)
375{
376 int ret, size, no_expand;
377 struct ext4_inode_info *ei = EXT4_I(inode);
378
379 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
380 return -ENOSPC;
381
382 size = ext4_get_max_inline_size(inode);
383 if (size < len)
384 return -ENOSPC;
385
386 ext4_write_lock_xattr(inode, &no_expand);
387
388 if (ei->i_inline_off)
389 ret = ext4_update_inline_data(handle, inode, len);
390 else
391 ret = ext4_create_inline_data(handle, inode, len);
392
393 ext4_write_unlock_xattr(inode, &no_expand);
394 return ret;
395}
396
397static int ext4_destroy_inline_data_nolock(handle_t *handle,
398 struct inode *inode)
399{
400 struct ext4_inode_info *ei = EXT4_I(inode);
401 struct ext4_xattr_ibody_find is = {
402 .s = { .not_found = 0, },
403 };
404 struct ext4_xattr_info i = {
405 .name_index = EXT4_XATTR_INDEX_SYSTEM,
406 .name = EXT4_XATTR_SYSTEM_DATA,
407 .value = NULL,
408 .value_len = 0,
409 };
410 int error;
411
412 if (!ei->i_inline_off)
413 return 0;
414
415 error = ext4_get_inode_loc(inode, &is.iloc);
416 if (error)
417 return error;
418
419 error = ext4_xattr_ibody_find(inode, &i, &is);
420 if (error)
421 goto out;
422
423 BUFFER_TRACE(is.iloc.bh, "get_write_access");
424 error = ext4_journal_get_write_access(handle, is.iloc.bh);
425 if (error)
426 goto out;
427
428 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
429 if (error)
430 goto out;
431
432 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
433 0, EXT4_MIN_INLINE_DATA_SIZE);
434
435 if (ext4_has_feature_extents(inode->i_sb)) {
436 if (S_ISDIR(inode->i_mode) ||
437 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
438 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
439 ext4_ext_tree_init(handle, inode);
440 }
441 }
442 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
443
444 get_bh(is.iloc.bh);
445 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
446
447 EXT4_I(inode)->i_inline_off = 0;
448 EXT4_I(inode)->i_inline_size = 0;
449 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
450out:
451 brelse(is.iloc.bh);
452 if (error == -ENODATA)
453 error = 0;
454 return error;
455}
456
457static int ext4_read_inline_page(struct inode *inode, struct page *page)
458{
459 void *kaddr;
460 int ret = 0;
461 size_t len;
462 struct ext4_iloc iloc;
463
464 BUG_ON(!PageLocked(page));
465 BUG_ON(!ext4_has_inline_data(inode));
466 BUG_ON(page->index);
467
468 if (!EXT4_I(inode)->i_inline_off) {
469 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
470 inode->i_ino);
471 goto out;
472 }
473
474 ret = ext4_get_inode_loc(inode, &iloc);
475 if (ret)
476 goto out;
477
478 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
479 kaddr = kmap_atomic(page);
480 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
481 flush_dcache_page(page);
482 kunmap_atomic(kaddr);
483 zero_user_segment(page, len, PAGE_SIZE);
484 SetPageUptodate(page);
485 brelse(iloc.bh);
486
487out:
488 return ret;
489}
490
491int ext4_readpage_inline(struct inode *inode, struct page *page)
492{
493 int ret = 0;
494
495 down_read(&EXT4_I(inode)->xattr_sem);
496 if (!ext4_has_inline_data(inode)) {
497 up_read(&EXT4_I(inode)->xattr_sem);
498 return -EAGAIN;
499 }
500
501 /*
502 * Current inline data can only exist in the 1st page,
503 * So for all the other pages, just set them uptodate.
504 */
505 if (!page->index)
506 ret = ext4_read_inline_page(inode, page);
507 else if (!PageUptodate(page)) {
508 zero_user_segment(page, 0, PAGE_SIZE);
509 SetPageUptodate(page);
510 }
511
512 up_read(&EXT4_I(inode)->xattr_sem);
513
514 unlock_page(page);
515 return ret >= 0 ? 0 : ret;
516}
517
518static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
519 struct inode *inode,
520 unsigned flags)
521{
522 int ret, needed_blocks, no_expand;
523 handle_t *handle = NULL;
524 int retries = 0, sem_held = 0;
525 struct page *page = NULL;
526 unsigned from, to;
527 struct ext4_iloc iloc;
528
529 if (!ext4_has_inline_data(inode)) {
530 /*
531 * clear the flag so that no new write
532 * will trap here again.
533 */
534 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
535 return 0;
536 }
537
538 needed_blocks = ext4_writepage_trans_blocks(inode);
539
540 ret = ext4_get_inode_loc(inode, &iloc);
541 if (ret)
542 return ret;
543
544retry:
545 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
546 if (IS_ERR(handle)) {
547 ret = PTR_ERR(handle);
548 handle = NULL;
549 goto out;
550 }
551
552 /* We cannot recurse into the filesystem as the transaction is already
553 * started */
554 flags |= AOP_FLAG_NOFS;
555
556 page = grab_cache_page_write_begin(mapping, 0, flags);
557 if (!page) {
558 ret = -ENOMEM;
559 goto out;
560 }
561
562 ext4_write_lock_xattr(inode, &no_expand);
563 sem_held = 1;
564 /* If some one has already done this for us, just exit. */
565 if (!ext4_has_inline_data(inode)) {
566 ret = 0;
567 goto out;
568 }
569
570 from = 0;
571 to = ext4_get_inline_size(inode);
572 if (!PageUptodate(page)) {
573 ret = ext4_read_inline_page(inode, page);
574 if (ret < 0)
575 goto out;
576 }
577
578 ret = ext4_destroy_inline_data_nolock(handle, inode);
579 if (ret)
580 goto out;
581
582 if (ext4_should_dioread_nolock(inode)) {
583 ret = __block_write_begin(page, from, to,
584 ext4_get_block_unwritten);
585 } else
586 ret = __block_write_begin(page, from, to, ext4_get_block);
587
588 if (!ret && ext4_should_journal_data(inode)) {
589 ret = ext4_walk_page_buffers(handle, page_buffers(page),
590 from, to, NULL,
591 do_journal_get_write_access);
592 }
593
594 if (ret) {
595 unlock_page(page);
596 put_page(page);
597 page = NULL;
598 ext4_orphan_add(handle, inode);
599 ext4_write_unlock_xattr(inode, &no_expand);
600 sem_held = 0;
601 ext4_journal_stop(handle);
602 handle = NULL;
603 ext4_truncate_failed_write(inode);
604 /*
605 * If truncate failed early the inode might
606 * still be on the orphan list; we need to
607 * make sure the inode is removed from the
608 * orphan list in that case.
609 */
610 if (inode->i_nlink)
611 ext4_orphan_del(NULL, inode);
612 }
613
614 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
615 goto retry;
616
617 if (page)
618 block_commit_write(page, from, to);
619out:
620 if (page) {
621 unlock_page(page);
622 put_page(page);
623 }
624 if (sem_held)
625 ext4_write_unlock_xattr(inode, &no_expand);
626 if (handle)
627 ext4_journal_stop(handle);
628 brelse(iloc.bh);
629 return ret;
630}
631
632/*
633 * Try to write data in the inode.
634 * If the inode has inline data, check whether the new write can be
635 * in the inode also. If not, create the page the handle, move the data
636 * to the page make it update and let the later codes create extent for it.
637 */
638int ext4_try_to_write_inline_data(struct address_space *mapping,
639 struct inode *inode,
640 loff_t pos, unsigned len,
641 unsigned flags,
642 struct page **pagep)
643{
644 int ret;
645 handle_t *handle;
646 struct page *page;
647 struct ext4_iloc iloc;
648
649 if (pos + len > ext4_get_max_inline_size(inode))
650 goto convert;
651
652 ret = ext4_get_inode_loc(inode, &iloc);
653 if (ret)
654 return ret;
655
656 /*
657 * The possible write could happen in the inode,
658 * so try to reserve the space in inode first.
659 */
660 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
661 if (IS_ERR(handle)) {
662 ret = PTR_ERR(handle);
663 handle = NULL;
664 goto out;
665 }
666
667 ret = ext4_prepare_inline_data(handle, inode, pos + len);
668 if (ret && ret != -ENOSPC)
669 goto out;
670
671 /* We don't have space in inline inode, so convert it to extent. */
672 if (ret == -ENOSPC) {
673 ext4_journal_stop(handle);
674 brelse(iloc.bh);
675 goto convert;
676 }
677
678 flags |= AOP_FLAG_NOFS;
679
680 page = grab_cache_page_write_begin(mapping, 0, flags);
681 if (!page) {
682 ret = -ENOMEM;
683 goto out;
684 }
685
686 *pagep = page;
687 down_read(&EXT4_I(inode)->xattr_sem);
688 if (!ext4_has_inline_data(inode)) {
689 ret = 0;
690 unlock_page(page);
691 put_page(page);
692 goto out_up_read;
693 }
694
695 if (!PageUptodate(page)) {
696 ret = ext4_read_inline_page(inode, page);
697 if (ret < 0)
698 goto out_up_read;
699 }
700
701 ret = 1;
702 handle = NULL;
703out_up_read:
704 up_read(&EXT4_I(inode)->xattr_sem);
705out:
706 if (handle)
707 ext4_journal_stop(handle);
708 brelse(iloc.bh);
709 return ret;
710convert:
711 return ext4_convert_inline_data_to_extent(mapping,
712 inode, flags);
713}
714
715int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
716 unsigned copied, struct page *page)
717{
718 int ret, no_expand;
719 void *kaddr;
720 struct ext4_iloc iloc;
721
722 if (unlikely(copied < len)) {
723 if (!PageUptodate(page)) {
724 copied = 0;
725 goto out;
726 }
727 }
728
729 ret = ext4_get_inode_loc(inode, &iloc);
730 if (ret) {
731 ext4_std_error(inode->i_sb, ret);
732 copied = 0;
733 goto out;
734 }
735
736 ext4_write_lock_xattr(inode, &no_expand);
737 BUG_ON(!ext4_has_inline_data(inode));
738
739 kaddr = kmap_atomic(page);
740 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
741 kunmap_atomic(kaddr);
742 SetPageUptodate(page);
743 /* clear page dirty so that writepages wouldn't work for us. */
744 ClearPageDirty(page);
745
746 ext4_write_unlock_xattr(inode, &no_expand);
747 brelse(iloc.bh);
748out:
749 return copied;
750}
751
752struct buffer_head *
753ext4_journalled_write_inline_data(struct inode *inode,
754 unsigned len,
755 struct page *page)
756{
757 int ret, no_expand;
758 void *kaddr;
759 struct ext4_iloc iloc;
760
761 ret = ext4_get_inode_loc(inode, &iloc);
762 if (ret) {
763 ext4_std_error(inode->i_sb, ret);
764 return NULL;
765 }
766
767 ext4_write_lock_xattr(inode, &no_expand);
768 kaddr = kmap_atomic(page);
769 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
770 kunmap_atomic(kaddr);
771 ext4_write_unlock_xattr(inode, &no_expand);
772
773 return iloc.bh;
774}
775
776/*
777 * Try to make the page cache and handle ready for the inline data case.
778 * We can call this function in 2 cases:
779 * 1. The inode is created and the first write exceeds inline size. We can
780 * clear the inode state safely.
781 * 2. The inode has inline data, then we need to read the data, make it
782 * update and dirty so that ext4_da_writepages can handle it. We don't
783 * need to start the journal since the file's metatdata isn't changed now.
784 */
785static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
786 struct inode *inode,
787 unsigned flags,
788 void **fsdata)
789{
790 int ret = 0, inline_size;
791 struct page *page;
792
793 page = grab_cache_page_write_begin(mapping, 0, flags);
794 if (!page)
795 return -ENOMEM;
796
797 down_read(&EXT4_I(inode)->xattr_sem);
798 if (!ext4_has_inline_data(inode)) {
799 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
800 goto out;
801 }
802
803 inline_size = ext4_get_inline_size(inode);
804
805 if (!PageUptodate(page)) {
806 ret = ext4_read_inline_page(inode, page);
807 if (ret < 0)
808 goto out;
809 }
810
811 ret = __block_write_begin(page, 0, inline_size,
812 ext4_da_get_block_prep);
813 if (ret) {
814 up_read(&EXT4_I(inode)->xattr_sem);
815 unlock_page(page);
816 put_page(page);
817 ext4_truncate_failed_write(inode);
818 return ret;
819 }
820
821 SetPageDirty(page);
822 SetPageUptodate(page);
823 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
824 *fsdata = (void *)CONVERT_INLINE_DATA;
825
826out:
827 up_read(&EXT4_I(inode)->xattr_sem);
828 if (page) {
829 unlock_page(page);
830 put_page(page);
831 }
832 return ret;
833}
834
835/*
836 * Prepare the write for the inline data.
837 * If the the data can be written into the inode, we just read
838 * the page and make it uptodate, and start the journal.
839 * Otherwise read the page, makes it dirty so that it can be
840 * handle in writepages(the i_disksize update is left to the
841 * normal ext4_da_write_end).
842 */
843int ext4_da_write_inline_data_begin(struct address_space *mapping,
844 struct inode *inode,
845 loff_t pos, unsigned len,
846 unsigned flags,
847 struct page **pagep,
848 void **fsdata)
849{
850 int ret, inline_size;
851 handle_t *handle;
852 struct page *page;
853 struct ext4_iloc iloc;
854 int retries;
855
856 ret = ext4_get_inode_loc(inode, &iloc);
857 if (ret)
858 return ret;
859
860retry_journal:
861 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
862 if (IS_ERR(handle)) {
863 ret = PTR_ERR(handle);
864 goto out;
865 }
866
867 inline_size = ext4_get_max_inline_size(inode);
868
869 ret = -ENOSPC;
870 if (inline_size >= pos + len) {
871 ret = ext4_prepare_inline_data(handle, inode, pos + len);
872 if (ret && ret != -ENOSPC)
873 goto out_journal;
874 }
875
876 /*
877 * We cannot recurse into the filesystem as the transaction
878 * is already started.
879 */
880 flags |= AOP_FLAG_NOFS;
881
882 if (ret == -ENOSPC) {
883 ret = ext4_da_convert_inline_data_to_extent(mapping,
884 inode,
885 flags,
886 fsdata);
887 ext4_journal_stop(handle);
888 if (ret == -ENOSPC &&
889 ext4_should_retry_alloc(inode->i_sb, &retries))
890 goto retry_journal;
891 goto out;
892 }
893
894
895 page = grab_cache_page_write_begin(mapping, 0, flags);
896 if (!page) {
897 ret = -ENOMEM;
898 goto out_journal;
899 }
900
901 down_read(&EXT4_I(inode)->xattr_sem);
902 if (!ext4_has_inline_data(inode)) {
903 ret = 0;
904 goto out_release_page;
905 }
906
907 if (!PageUptodate(page)) {
908 ret = ext4_read_inline_page(inode, page);
909 if (ret < 0)
910 goto out_release_page;
911 }
912
913 up_read(&EXT4_I(inode)->xattr_sem);
914 *pagep = page;
915 brelse(iloc.bh);
916 return 1;
917out_release_page:
918 up_read(&EXT4_I(inode)->xattr_sem);
919 unlock_page(page);
920 put_page(page);
921out_journal:
922 ext4_journal_stop(handle);
923out:
924 brelse(iloc.bh);
925 return ret;
926}
927
928int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
929 unsigned len, unsigned copied,
930 struct page *page)
931{
932 int i_size_changed = 0;
933 int ret;
934
935 ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
936 if (ret < 0) {
937 unlock_page(page);
938 put_page(page);
939 return ret;
940 }
941 copied = ret;
942
943 /*
944 * No need to use i_size_read() here, the i_size
945 * cannot change under us because we hold i_mutex.
946 *
947 * But it's important to update i_size while still holding page lock:
948 * page writeout could otherwise come in and zero beyond i_size.
949 */
950 if (pos+copied > inode->i_size) {
951 i_size_write(inode, pos+copied);
952 i_size_changed = 1;
953 }
954 unlock_page(page);
955 put_page(page);
956
957 /*
958 * Don't mark the inode dirty under page lock. First, it unnecessarily
959 * makes the holding time of page lock longer. Second, it forces lock
960 * ordering of page lock and transaction start for journaling
961 * filesystems.
962 */
963 if (i_size_changed)
964 mark_inode_dirty(inode);
965
966 return copied;
967}
968
969#ifdef INLINE_DIR_DEBUG
970void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
971 void *inline_start, int inline_size)
972{
973 int offset;
974 unsigned short de_len;
975 struct ext4_dir_entry_2 *de = inline_start;
976 void *dlimit = inline_start + inline_size;
977
978 trace_printk("inode %lu\n", dir->i_ino);
979 offset = 0;
980 while ((void *)de < dlimit) {
981 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
982 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
983 offset, de_len, de->name_len, de->name,
984 de->name_len, le32_to_cpu(de->inode));
985 if (ext4_check_dir_entry(dir, NULL, de, bh,
986 inline_start, inline_size, offset))
987 BUG();
988
989 offset += de_len;
990 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
991 }
992}
993#else
994#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
995#endif
996
997/*
998 * Add a new entry into a inline dir.
999 * It will return -ENOSPC if no space is available, and -EIO
1000 * and -EEXIST if directory entry already exists.
1001 */
1002static int ext4_add_dirent_to_inline(handle_t *handle,
1003 struct ext4_filename *fname,
1004 struct inode *dir,
1005 struct inode *inode,
1006 struct ext4_iloc *iloc,
1007 void *inline_start, int inline_size)
1008{
1009 int err;
1010 struct ext4_dir_entry_2 *de;
1011
1012 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1013 inline_size, fname, &de);
1014 if (err)
1015 return err;
1016
1017 BUFFER_TRACE(iloc->bh, "get_write_access");
1018 err = ext4_journal_get_write_access(handle, iloc->bh);
1019 if (err)
1020 return err;
1021 ext4_insert_dentry(inode, de, inline_size, fname);
1022
1023 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1024
1025 /*
1026 * XXX shouldn't update any times until successful
1027 * completion of syscall, but too many callers depend
1028 * on this.
1029 *
1030 * XXX similarly, too many callers depend on
1031 * ext4_new_inode() setting the times, but error
1032 * recovery deletes the inode, so the worst that can
1033 * happen is that the times are slightly out of date
1034 * and/or different from the directory change time.
1035 */
1036 dir->i_mtime = dir->i_ctime = current_time(dir);
1037 ext4_update_dx_flag(dir);
1038 inode_inc_iversion(dir);
1039 return 1;
1040}
1041
1042static void *ext4_get_inline_xattr_pos(struct inode *inode,
1043 struct ext4_iloc *iloc)
1044{
1045 struct ext4_xattr_entry *entry;
1046 struct ext4_xattr_ibody_header *header;
1047
1048 BUG_ON(!EXT4_I(inode)->i_inline_off);
1049
1050 header = IHDR(inode, ext4_raw_inode(iloc));
1051 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1052 EXT4_I(inode)->i_inline_off);
1053
1054 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1055}
1056
1057/* Set the final de to cover the whole block. */
1058static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1059{
1060 struct ext4_dir_entry_2 *de, *prev_de;
1061 void *limit;
1062 int de_len;
1063
1064 de = (struct ext4_dir_entry_2 *)de_buf;
1065 if (old_size) {
1066 limit = de_buf + old_size;
1067 do {
1068 prev_de = de;
1069 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1070 de_buf += de_len;
1071 de = (struct ext4_dir_entry_2 *)de_buf;
1072 } while (de_buf < limit);
1073
1074 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1075 old_size, new_size);
1076 } else {
1077 /* this is just created, so create an empty entry. */
1078 de->inode = 0;
1079 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1080 }
1081}
1082
1083static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1084 struct ext4_iloc *iloc)
1085{
1086 int ret;
1087 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1088 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1089
1090 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1091 return -ENOSPC;
1092
1093 ret = ext4_update_inline_data(handle, dir,
1094 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1095 if (ret)
1096 return ret;
1097
1098 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1099 EXT4_I(dir)->i_inline_size -
1100 EXT4_MIN_INLINE_DATA_SIZE);
1101 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1102 return 0;
1103}
1104
1105static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1106 struct ext4_iloc *iloc,
1107 void *buf, int inline_size)
1108{
1109 ext4_create_inline_data(handle, inode, inline_size);
1110 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1111 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1112}
1113
1114static int ext4_finish_convert_inline_dir(handle_t *handle,
1115 struct inode *inode,
1116 struct buffer_head *dir_block,
1117 void *buf,
1118 int inline_size)
1119{
1120 int err, csum_size = 0, header_size = 0;
1121 struct ext4_dir_entry_2 *de;
1122 struct ext4_dir_entry_tail *t;
1123 void *target = dir_block->b_data;
1124
1125 /*
1126 * First create "." and ".." and then copy the dir information
1127 * back to the block.
1128 */
1129 de = (struct ext4_dir_entry_2 *)target;
1130 de = ext4_init_dot_dotdot(inode, de,
1131 inode->i_sb->s_blocksize, csum_size,
1132 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1133 header_size = (void *)de - target;
1134
1135 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1136 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1137
1138 if (ext4_has_metadata_csum(inode->i_sb))
1139 csum_size = sizeof(struct ext4_dir_entry_tail);
1140
1141 inode->i_size = inode->i_sb->s_blocksize;
1142 i_size_write(inode, inode->i_sb->s_blocksize);
1143 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1144 ext4_update_final_de(dir_block->b_data,
1145 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1146 inode->i_sb->s_blocksize - csum_size);
1147
1148 if (csum_size) {
1149 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1150 inode->i_sb->s_blocksize);
1151 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1152 }
1153 set_buffer_uptodate(dir_block);
1154 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1155 if (err)
1156 return err;
1157 set_buffer_verified(dir_block);
1158 return ext4_mark_inode_dirty(handle, inode);
1159}
1160
1161static int ext4_convert_inline_data_nolock(handle_t *handle,
1162 struct inode *inode,
1163 struct ext4_iloc *iloc)
1164{
1165 int error;
1166 void *buf = NULL;
1167 struct buffer_head *data_bh = NULL;
1168 struct ext4_map_blocks map;
1169 int inline_size;
1170
1171 inline_size = ext4_get_inline_size(inode);
1172 buf = kmalloc(inline_size, GFP_NOFS);
1173 if (!buf) {
1174 error = -ENOMEM;
1175 goto out;
1176 }
1177
1178 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1179 if (error < 0)
1180 goto out;
1181
1182 /*
1183 * Make sure the inline directory entries pass checks before we try to
1184 * convert them, so that we avoid touching stuff that needs fsck.
1185 */
1186 if (S_ISDIR(inode->i_mode)) {
1187 error = ext4_check_all_de(inode, iloc->bh,
1188 buf + EXT4_INLINE_DOTDOT_SIZE,
1189 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1190 if (error)
1191 goto out;
1192 }
1193
1194 error = ext4_destroy_inline_data_nolock(handle, inode);
1195 if (error)
1196 goto out;
1197
1198 map.m_lblk = 0;
1199 map.m_len = 1;
1200 map.m_flags = 0;
1201 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1202 if (error < 0)
1203 goto out_restore;
1204 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1205 error = -EIO;
1206 goto out_restore;
1207 }
1208
1209 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1210 if (!data_bh) {
1211 error = -ENOMEM;
1212 goto out_restore;
1213 }
1214
1215 lock_buffer(data_bh);
1216 error = ext4_journal_get_create_access(handle, data_bh);
1217 if (error) {
1218 unlock_buffer(data_bh);
1219 error = -EIO;
1220 goto out_restore;
1221 }
1222 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1223
1224 if (!S_ISDIR(inode->i_mode)) {
1225 memcpy(data_bh->b_data, buf, inline_size);
1226 set_buffer_uptodate(data_bh);
1227 error = ext4_handle_dirty_metadata(handle,
1228 inode, data_bh);
1229 } else {
1230 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1231 buf, inline_size);
1232 }
1233
1234 unlock_buffer(data_bh);
1235out_restore:
1236 if (error)
1237 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1238
1239out:
1240 brelse(data_bh);
1241 kfree(buf);
1242 return error;
1243}
1244
1245/*
1246 * Try to add the new entry to the inline data.
1247 * If succeeds, return 0. If not, extended the inline dir and copied data to
1248 * the new created block.
1249 */
1250int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1251 struct inode *dir, struct inode *inode)
1252{
1253 int ret, inline_size, no_expand;
1254 void *inline_start;
1255 struct ext4_iloc iloc;
1256
1257 ret = ext4_get_inode_loc(dir, &iloc);
1258 if (ret)
1259 return ret;
1260
1261 ext4_write_lock_xattr(dir, &no_expand);
1262 if (!ext4_has_inline_data(dir))
1263 goto out;
1264
1265 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1266 EXT4_INLINE_DOTDOT_SIZE;
1267 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1268
1269 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1270 inline_start, inline_size);
1271 if (ret != -ENOSPC)
1272 goto out;
1273
1274 /* check whether it can be inserted to inline xattr space. */
1275 inline_size = EXT4_I(dir)->i_inline_size -
1276 EXT4_MIN_INLINE_DATA_SIZE;
1277 if (!inline_size) {
1278 /* Try to use the xattr space.*/
1279 ret = ext4_update_inline_dir(handle, dir, &iloc);
1280 if (ret && ret != -ENOSPC)
1281 goto out;
1282
1283 inline_size = EXT4_I(dir)->i_inline_size -
1284 EXT4_MIN_INLINE_DATA_SIZE;
1285 }
1286
1287 if (inline_size) {
1288 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1289
1290 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1291 inode, &iloc, inline_start,
1292 inline_size);
1293
1294 if (ret != -ENOSPC)
1295 goto out;
1296 }
1297
1298 /*
1299 * The inline space is filled up, so create a new block for it.
1300 * As the extent tree will be created, we have to save the inline
1301 * dir first.
1302 */
1303 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1304
1305out:
1306 ext4_write_unlock_xattr(dir, &no_expand);
1307 ext4_mark_inode_dirty(handle, dir);
1308 brelse(iloc.bh);
1309 return ret;
1310}
1311
1312/*
1313 * This function fills a red-black tree with information from an
1314 * inlined dir. It returns the number directory entries loaded
1315 * into the tree. If there is an error it is returned in err.
1316 */
1317int htree_inlinedir_to_tree(struct file *dir_file,
1318 struct inode *dir, ext4_lblk_t block,
1319 struct dx_hash_info *hinfo,
1320 __u32 start_hash, __u32 start_minor_hash,
1321 int *has_inline_data)
1322{
1323 int err = 0, count = 0;
1324 unsigned int parent_ino;
1325 int pos;
1326 struct ext4_dir_entry_2 *de;
1327 struct inode *inode = file_inode(dir_file);
1328 int ret, inline_size = 0;
1329 struct ext4_iloc iloc;
1330 void *dir_buf = NULL;
1331 struct ext4_dir_entry_2 fake;
1332 struct fscrypt_str tmp_str;
1333
1334 ret = ext4_get_inode_loc(inode, &iloc);
1335 if (ret)
1336 return ret;
1337
1338 down_read(&EXT4_I(inode)->xattr_sem);
1339 if (!ext4_has_inline_data(inode)) {
1340 up_read(&EXT4_I(inode)->xattr_sem);
1341 *has_inline_data = 0;
1342 goto out;
1343 }
1344
1345 inline_size = ext4_get_inline_size(inode);
1346 dir_buf = kmalloc(inline_size, GFP_NOFS);
1347 if (!dir_buf) {
1348 ret = -ENOMEM;
1349 up_read(&EXT4_I(inode)->xattr_sem);
1350 goto out;
1351 }
1352
1353 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1354 up_read(&EXT4_I(inode)->xattr_sem);
1355 if (ret < 0)
1356 goto out;
1357
1358 pos = 0;
1359 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1360 while (pos < inline_size) {
1361 /*
1362 * As inlined dir doesn't store any information about '.' and
1363 * only the inode number of '..' is stored, we have to handle
1364 * them differently.
1365 */
1366 if (pos == 0) {
1367 fake.inode = cpu_to_le32(inode->i_ino);
1368 fake.name_len = 1;
1369 strcpy(fake.name, ".");
1370 fake.rec_len = ext4_rec_len_to_disk(
1371 EXT4_DIR_REC_LEN(fake.name_len),
1372 inline_size);
1373 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1374 de = &fake;
1375 pos = EXT4_INLINE_DOTDOT_OFFSET;
1376 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1377 fake.inode = cpu_to_le32(parent_ino);
1378 fake.name_len = 2;
1379 strcpy(fake.name, "..");
1380 fake.rec_len = ext4_rec_len_to_disk(
1381 EXT4_DIR_REC_LEN(fake.name_len),
1382 inline_size);
1383 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1384 de = &fake;
1385 pos = EXT4_INLINE_DOTDOT_SIZE;
1386 } else {
1387 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1388 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1389 if (ext4_check_dir_entry(inode, dir_file, de,
1390 iloc.bh, dir_buf,
1391 inline_size, pos)) {
1392 ret = count;
1393 goto out;
1394 }
1395 }
1396
1397 ext4fs_dirhash(de->name, de->name_len, hinfo);
1398 if ((hinfo->hash < start_hash) ||
1399 ((hinfo->hash == start_hash) &&
1400 (hinfo->minor_hash < start_minor_hash)))
1401 continue;
1402 if (de->inode == 0)
1403 continue;
1404 tmp_str.name = de->name;
1405 tmp_str.len = de->name_len;
1406 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1407 hinfo->minor_hash, de, &tmp_str);
1408 if (err) {
1409 count = err;
1410 goto out;
1411 }
1412 count++;
1413 }
1414 ret = count;
1415out:
1416 kfree(dir_buf);
1417 brelse(iloc.bh);
1418 return ret;
1419}
1420
1421/*
1422 * So this function is called when the volume is mkfsed with
1423 * dir_index disabled. In order to keep f_pos persistent
1424 * after we convert from an inlined dir to a blocked based,
1425 * we just pretend that we are a normal dir and return the
1426 * offset as if '.' and '..' really take place.
1427 *
1428 */
1429int ext4_read_inline_dir(struct file *file,
1430 struct dir_context *ctx,
1431 int *has_inline_data)
1432{
1433 unsigned int offset, parent_ino;
1434 int i;
1435 struct ext4_dir_entry_2 *de;
1436 struct super_block *sb;
1437 struct inode *inode = file_inode(file);
1438 int ret, inline_size = 0;
1439 struct ext4_iloc iloc;
1440 void *dir_buf = NULL;
1441 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1442
1443 ret = ext4_get_inode_loc(inode, &iloc);
1444 if (ret)
1445 return ret;
1446
1447 down_read(&EXT4_I(inode)->xattr_sem);
1448 if (!ext4_has_inline_data(inode)) {
1449 up_read(&EXT4_I(inode)->xattr_sem);
1450 *has_inline_data = 0;
1451 goto out;
1452 }
1453
1454 inline_size = ext4_get_inline_size(inode);
1455 dir_buf = kmalloc(inline_size, GFP_NOFS);
1456 if (!dir_buf) {
1457 ret = -ENOMEM;
1458 up_read(&EXT4_I(inode)->xattr_sem);
1459 goto out;
1460 }
1461
1462 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1463 up_read(&EXT4_I(inode)->xattr_sem);
1464 if (ret < 0)
1465 goto out;
1466
1467 ret = 0;
1468 sb = inode->i_sb;
1469 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1470 offset = ctx->pos;
1471
1472 /*
1473 * dotdot_offset and dotdot_size is the real offset and
1474 * size for ".." and "." if the dir is block based while
1475 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1476 * So we will use extra_offset and extra_size to indicate them
1477 * during the inline dir iteration.
1478 */
1479 dotdot_offset = EXT4_DIR_REC_LEN(1);
1480 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1481 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1482 extra_size = extra_offset + inline_size;
1483
1484 /*
1485 * If the version has changed since the last call to
1486 * readdir(2), then we might be pointing to an invalid
1487 * dirent right now. Scan from the start of the inline
1488 * dir to make sure.
1489 */
1490 if (!inode_eq_iversion(inode, file->f_version)) {
1491 for (i = 0; i < extra_size && i < offset;) {
1492 /*
1493 * "." is with offset 0 and
1494 * ".." is dotdot_offset.
1495 */
1496 if (!i) {
1497 i = dotdot_offset;
1498 continue;
1499 } else if (i == dotdot_offset) {
1500 i = dotdot_size;
1501 continue;
1502 }
1503 /* for other entry, the real offset in
1504 * the buf has to be tuned accordingly.
1505 */
1506 de = (struct ext4_dir_entry_2 *)
1507 (dir_buf + i - extra_offset);
1508 /* It's too expensive to do a full
1509 * dirent test each time round this
1510 * loop, but we do have to test at
1511 * least that it is non-zero. A
1512 * failure will be detected in the
1513 * dirent test below. */
1514 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1515 < EXT4_DIR_REC_LEN(1))
1516 break;
1517 i += ext4_rec_len_from_disk(de->rec_len,
1518 extra_size);
1519 }
1520 offset = i;
1521 ctx->pos = offset;
1522 file->f_version = inode_query_iversion(inode);
1523 }
1524
1525 while (ctx->pos < extra_size) {
1526 if (ctx->pos == 0) {
1527 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1528 goto out;
1529 ctx->pos = dotdot_offset;
1530 continue;
1531 }
1532
1533 if (ctx->pos == dotdot_offset) {
1534 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1535 goto out;
1536 ctx->pos = dotdot_size;
1537 continue;
1538 }
1539
1540 de = (struct ext4_dir_entry_2 *)
1541 (dir_buf + ctx->pos - extra_offset);
1542 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1543 extra_size, ctx->pos))
1544 goto out;
1545 if (le32_to_cpu(de->inode)) {
1546 if (!dir_emit(ctx, de->name, de->name_len,
1547 le32_to_cpu(de->inode),
1548 get_dtype(sb, de->file_type)))
1549 goto out;
1550 }
1551 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1552 }
1553out:
1554 kfree(dir_buf);
1555 brelse(iloc.bh);
1556 return ret;
1557}
1558
1559struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1560 struct ext4_dir_entry_2 **parent_de,
1561 int *retval)
1562{
1563 struct ext4_iloc iloc;
1564
1565 *retval = ext4_get_inode_loc(inode, &iloc);
1566 if (*retval)
1567 return NULL;
1568
1569 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1570
1571 return iloc.bh;
1572}
1573
1574/*
1575 * Try to create the inline data for the new dir.
1576 * If it succeeds, return 0, otherwise return the error.
1577 * In case of ENOSPC, the caller should create the normal disk layout dir.
1578 */
1579int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1580 struct inode *inode)
1581{
1582 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1583 struct ext4_iloc iloc;
1584 struct ext4_dir_entry_2 *de;
1585
1586 ret = ext4_get_inode_loc(inode, &iloc);
1587 if (ret)
1588 return ret;
1589
1590 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1591 if (ret)
1592 goto out;
1593
1594 /*
1595 * For inline dir, we only save the inode information for the ".."
1596 * and create a fake dentry to cover the left space.
1597 */
1598 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1599 de->inode = cpu_to_le32(parent->i_ino);
1600 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1601 de->inode = 0;
1602 de->rec_len = ext4_rec_len_to_disk(
1603 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1604 inline_size);
1605 set_nlink(inode, 2);
1606 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1607out:
1608 brelse(iloc.bh);
1609 return ret;
1610}
1611
1612struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1613 struct ext4_filename *fname,
1614 struct ext4_dir_entry_2 **res_dir,
1615 int *has_inline_data)
1616{
1617 int ret;
1618 struct ext4_iloc iloc;
1619 void *inline_start;
1620 int inline_size;
1621
1622 if (ext4_get_inode_loc(dir, &iloc))
1623 return NULL;
1624
1625 down_read(&EXT4_I(dir)->xattr_sem);
1626 if (!ext4_has_inline_data(dir)) {
1627 *has_inline_data = 0;
1628 goto out;
1629 }
1630
1631 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1632 EXT4_INLINE_DOTDOT_SIZE;
1633 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1634 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1635 dir, fname, 0, res_dir);
1636 if (ret == 1)
1637 goto out_find;
1638 if (ret < 0)
1639 goto out;
1640
1641 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1642 goto out;
1643
1644 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1645 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1646
1647 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1648 dir, fname, 0, res_dir);
1649 if (ret == 1)
1650 goto out_find;
1651
1652out:
1653 brelse(iloc.bh);
1654 iloc.bh = NULL;
1655out_find:
1656 up_read(&EXT4_I(dir)->xattr_sem);
1657 return iloc.bh;
1658}
1659
1660int ext4_delete_inline_entry(handle_t *handle,
1661 struct inode *dir,
1662 struct ext4_dir_entry_2 *de_del,
1663 struct buffer_head *bh,
1664 int *has_inline_data)
1665{
1666 int err, inline_size, no_expand;
1667 struct ext4_iloc iloc;
1668 void *inline_start;
1669
1670 err = ext4_get_inode_loc(dir, &iloc);
1671 if (err)
1672 return err;
1673
1674 ext4_write_lock_xattr(dir, &no_expand);
1675 if (!ext4_has_inline_data(dir)) {
1676 *has_inline_data = 0;
1677 goto out;
1678 }
1679
1680 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1681 EXT4_MIN_INLINE_DATA_SIZE) {
1682 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1683 EXT4_INLINE_DOTDOT_SIZE;
1684 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1685 EXT4_INLINE_DOTDOT_SIZE;
1686 } else {
1687 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1688 inline_size = ext4_get_inline_size(dir) -
1689 EXT4_MIN_INLINE_DATA_SIZE;
1690 }
1691
1692 BUFFER_TRACE(bh, "get_write_access");
1693 err = ext4_journal_get_write_access(handle, bh);
1694 if (err)
1695 goto out;
1696
1697 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1698 inline_start, inline_size, 0);
1699 if (err)
1700 goto out;
1701
1702 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1703out:
1704 ext4_write_unlock_xattr(dir, &no_expand);
1705 if (likely(err == 0))
1706 err = ext4_mark_inode_dirty(handle, dir);
1707 brelse(iloc.bh);
1708 if (err != -ENOENT)
1709 ext4_std_error(dir->i_sb, err);
1710 return err;
1711}
1712
1713/*
1714 * Get the inline dentry at offset.
1715 */
1716static inline struct ext4_dir_entry_2 *
1717ext4_get_inline_entry(struct inode *inode,
1718 struct ext4_iloc *iloc,
1719 unsigned int offset,
1720 void **inline_start,
1721 int *inline_size)
1722{
1723 void *inline_pos;
1724
1725 BUG_ON(offset > ext4_get_inline_size(inode));
1726
1727 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1728 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1729 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1730 } else {
1731 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1732 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1733 *inline_size = ext4_get_inline_size(inode) -
1734 EXT4_MIN_INLINE_DATA_SIZE;
1735 }
1736
1737 if (inline_start)
1738 *inline_start = inline_pos;
1739 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1740}
1741
1742bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1743{
1744 int err, inline_size;
1745 struct ext4_iloc iloc;
1746 void *inline_pos;
1747 unsigned int offset;
1748 struct ext4_dir_entry_2 *de;
1749 bool ret = true;
1750
1751 err = ext4_get_inode_loc(dir, &iloc);
1752 if (err) {
1753 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1754 err, dir->i_ino);
1755 return true;
1756 }
1757
1758 down_read(&EXT4_I(dir)->xattr_sem);
1759 if (!ext4_has_inline_data(dir)) {
1760 *has_inline_data = 0;
1761 goto out;
1762 }
1763
1764 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1765 if (!le32_to_cpu(de->inode)) {
1766 ext4_warning(dir->i_sb,
1767 "bad inline directory (dir #%lu) - no `..'",
1768 dir->i_ino);
1769 ret = true;
1770 goto out;
1771 }
1772
1773 offset = EXT4_INLINE_DOTDOT_SIZE;
1774 while (offset < dir->i_size) {
1775 de = ext4_get_inline_entry(dir, &iloc, offset,
1776 &inline_pos, &inline_size);
1777 if (ext4_check_dir_entry(dir, NULL, de,
1778 iloc.bh, inline_pos,
1779 inline_size, offset)) {
1780 ext4_warning(dir->i_sb,
1781 "bad inline directory (dir #%lu) - "
1782 "inode %u, rec_len %u, name_len %d"
1783 "inline size %d",
1784 dir->i_ino, le32_to_cpu(de->inode),
1785 le16_to_cpu(de->rec_len), de->name_len,
1786 inline_size);
1787 ret = true;
1788 goto out;
1789 }
1790 if (le32_to_cpu(de->inode)) {
1791 ret = false;
1792 goto out;
1793 }
1794 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1795 }
1796
1797out:
1798 up_read(&EXT4_I(dir)->xattr_sem);
1799 brelse(iloc.bh);
1800 return ret;
1801}
1802
1803int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1804{
1805 int ret, no_expand;
1806
1807 ext4_write_lock_xattr(inode, &no_expand);
1808 ret = ext4_destroy_inline_data_nolock(handle, inode);
1809 ext4_write_unlock_xattr(inode, &no_expand);
1810
1811 return ret;
1812}
1813
1814int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1815{
1816 __u64 addr;
1817 int error = -EAGAIN;
1818 struct ext4_iloc iloc;
1819
1820 down_read(&EXT4_I(inode)->xattr_sem);
1821 if (!ext4_has_inline_data(inode))
1822 goto out;
1823
1824 error = ext4_get_inode_loc(inode, &iloc);
1825 if (error)
1826 goto out;
1827
1828 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1829 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1830 addr += offsetof(struct ext4_inode, i_block);
1831
1832 brelse(iloc.bh);
1833
1834 iomap->addr = addr;
1835 iomap->offset = 0;
1836 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1837 i_size_read(inode));
1838 iomap->type = 0;
1839 iomap->flags = IOMAP_F_DATA_INLINE;
1840
1841out:
1842 up_read(&EXT4_I(inode)->xattr_sem);
1843 return error;
1844}
1845
1846int ext4_inline_data_fiemap(struct inode *inode,
1847 struct fiemap_extent_info *fieinfo,
1848 int *has_inline, __u64 start, __u64 len)
1849{
1850 __u64 physical = 0;
1851 __u64 inline_len;
1852 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1853 FIEMAP_EXTENT_LAST;
1854 int error = 0;
1855 struct ext4_iloc iloc;
1856
1857 down_read(&EXT4_I(inode)->xattr_sem);
1858 if (!ext4_has_inline_data(inode)) {
1859 *has_inline = 0;
1860 goto out;
1861 }
1862 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1863 i_size_read(inode));
1864 if (start >= inline_len)
1865 goto out;
1866 if (start + len < inline_len)
1867 inline_len = start + len;
1868 inline_len -= start;
1869
1870 error = ext4_get_inode_loc(inode, &iloc);
1871 if (error)
1872 goto out;
1873
1874 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1875 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1876 physical += offsetof(struct ext4_inode, i_block);
1877
1878 if (physical)
1879 error = fiemap_fill_next_extent(fieinfo, start, physical,
1880 inline_len, flags);
1881 brelse(iloc.bh);
1882out:
1883 up_read(&EXT4_I(inode)->xattr_sem);
1884 return (error < 0 ? error : 0);
1885}
1886
1887/*
1888 * Called during xattr set, and if we can sparse space 'needed',
1889 * just create the extent tree evict the data to the outer block.
1890 *
1891 * We use jbd2 instead of page cache to move data to the 1st block
1892 * so that the whole transaction can be committed as a whole and
1893 * the data isn't lost because of the delayed page cache write.
1894 */
1895int ext4_try_to_evict_inline_data(handle_t *handle,
1896 struct inode *inode,
1897 int needed)
1898{
1899 int error;
1900 struct ext4_xattr_entry *entry;
1901 struct ext4_inode *raw_inode;
1902 struct ext4_iloc iloc;
1903
1904 error = ext4_get_inode_loc(inode, &iloc);
1905 if (error)
1906 return error;
1907
1908 raw_inode = ext4_raw_inode(&iloc);
1909 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1910 EXT4_I(inode)->i_inline_off);
1911 if (EXT4_XATTR_LEN(entry->e_name_len) +
1912 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1913 error = -ENOSPC;
1914 goto out;
1915 }
1916
1917 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1918out:
1919 brelse(iloc.bh);
1920 return error;
1921}
1922
1923int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1924{
1925 handle_t *handle;
1926 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1927 size_t i_size;
1928 void *value = NULL;
1929 struct ext4_xattr_ibody_find is = {
1930 .s = { .not_found = -ENODATA, },
1931 };
1932 struct ext4_xattr_info i = {
1933 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1934 .name = EXT4_XATTR_SYSTEM_DATA,
1935 };
1936
1937
1938 needed_blocks = ext4_writepage_trans_blocks(inode);
1939 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1940 if (IS_ERR(handle))
1941 return PTR_ERR(handle);
1942
1943 ext4_write_lock_xattr(inode, &no_expand);
1944 if (!ext4_has_inline_data(inode)) {
1945 *has_inline = 0;
1946 ext4_journal_stop(handle);
1947 return 0;
1948 }
1949
1950 if ((err = ext4_orphan_add(handle, inode)) != 0)
1951 goto out;
1952
1953 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1954 goto out;
1955
1956 down_write(&EXT4_I(inode)->i_data_sem);
1957 i_size = inode->i_size;
1958 inline_size = ext4_get_inline_size(inode);
1959 EXT4_I(inode)->i_disksize = i_size;
1960
1961 if (i_size < inline_size) {
1962 /* Clear the content in the xattr space. */
1963 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1964 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1965 goto out_error;
1966
1967 BUG_ON(is.s.not_found);
1968
1969 value_len = le32_to_cpu(is.s.here->e_value_size);
1970 value = kmalloc(value_len, GFP_NOFS);
1971 if (!value) {
1972 err = -ENOMEM;
1973 goto out_error;
1974 }
1975
1976 err = ext4_xattr_ibody_get(inode, i.name_index,
1977 i.name, value, value_len);
1978 if (err <= 0)
1979 goto out_error;
1980
1981 i.value = value;
1982 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1983 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1984 err = ext4_xattr_ibody_inline_set(handle, inode,
1985 &i, &is);
1986 if (err)
1987 goto out_error;
1988 }
1989
1990 /* Clear the content within i_blocks. */
1991 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1992 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1993 memset(p + i_size, 0,
1994 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1995 }
1996
1997 EXT4_I(inode)->i_inline_size = i_size <
1998 EXT4_MIN_INLINE_DATA_SIZE ?
1999 EXT4_MIN_INLINE_DATA_SIZE : i_size;
2000 }
2001
2002out_error:
2003 up_write(&EXT4_I(inode)->i_data_sem);
2004out:
2005 brelse(is.iloc.bh);
2006 ext4_write_unlock_xattr(inode, &no_expand);
2007 kfree(value);
2008 if (inode->i_nlink)
2009 ext4_orphan_del(handle, inode);
2010
2011 if (err == 0) {
2012 inode->i_mtime = inode->i_ctime = current_time(inode);
2013 err = ext4_mark_inode_dirty(handle, inode);
2014 if (IS_SYNC(inode))
2015 ext4_handle_sync(handle);
2016 }
2017 ext4_journal_stop(handle);
2018 return err;
2019}
2020
2021int ext4_convert_inline_data(struct inode *inode)
2022{
2023 int error, needed_blocks, no_expand;
2024 handle_t *handle;
2025 struct ext4_iloc iloc;
2026
2027 if (!ext4_has_inline_data(inode)) {
2028 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2029 return 0;
2030 }
2031
2032 needed_blocks = ext4_writepage_trans_blocks(inode);
2033
2034 iloc.bh = NULL;
2035 error = ext4_get_inode_loc(inode, &iloc);
2036 if (error)
2037 return error;
2038
2039 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2040 if (IS_ERR(handle)) {
2041 error = PTR_ERR(handle);
2042 goto out_free;
2043 }
2044
2045 ext4_write_lock_xattr(inode, &no_expand);
2046 if (ext4_has_inline_data(inode))
2047 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2048 ext4_write_unlock_xattr(inode, &no_expand);
2049 ext4_journal_stop(handle);
2050out_free:
2051 brelse(iloc.bh);
2052 return error;
2053}
1/*
2 * Copyright (c) 2012 Taobao.
3 * Written by Tao Ma <boyu.mt@taobao.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/fiemap.h>
16
17#include "ext4_jbd2.h"
18#include "ext4.h"
19#include "xattr.h"
20#include "truncate.h"
21
22#define EXT4_XATTR_SYSTEM_DATA "data"
23#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
24#define EXT4_INLINE_DOTDOT_OFFSET 2
25#define EXT4_INLINE_DOTDOT_SIZE 4
26
27static int ext4_get_inline_size(struct inode *inode)
28{
29 if (EXT4_I(inode)->i_inline_off)
30 return EXT4_I(inode)->i_inline_size;
31
32 return 0;
33}
34
35static int get_max_inline_xattr_value_size(struct inode *inode,
36 struct ext4_iloc *iloc)
37{
38 struct ext4_xattr_ibody_header *header;
39 struct ext4_xattr_entry *entry;
40 struct ext4_inode *raw_inode;
41 int free, min_offs;
42
43 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
44 EXT4_GOOD_OLD_INODE_SIZE -
45 EXT4_I(inode)->i_extra_isize -
46 sizeof(struct ext4_xattr_ibody_header);
47
48 /*
49 * We need to subtract another sizeof(__u32) since an in-inode xattr
50 * needs an empty 4 bytes to indicate the gap between the xattr entry
51 * and the name/value pair.
52 */
53 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
54 return EXT4_XATTR_SIZE(min_offs -
55 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
56 EXT4_XATTR_ROUND - sizeof(__u32));
57
58 raw_inode = ext4_raw_inode(iloc);
59 header = IHDR(inode, raw_inode);
60 entry = IFIRST(header);
61
62 /* Compute min_offs. */
63 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
64 if (!entry->e_value_block && entry->e_value_size) {
65 size_t offs = le16_to_cpu(entry->e_value_offs);
66 if (offs < min_offs)
67 min_offs = offs;
68 }
69 }
70 free = min_offs -
71 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
72
73 if (EXT4_I(inode)->i_inline_off) {
74 entry = (struct ext4_xattr_entry *)
75 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
76
77 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
78 goto out;
79 }
80
81 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
82
83 if (free > EXT4_XATTR_ROUND)
84 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
85 else
86 free = 0;
87
88out:
89 return free;
90}
91
92/*
93 * Get the maximum size we now can store in an inode.
94 * If we can't find the space for a xattr entry, don't use the space
95 * of the extents since we have no space to indicate the inline data.
96 */
97int ext4_get_max_inline_size(struct inode *inode)
98{
99 int error, max_inline_size;
100 struct ext4_iloc iloc;
101
102 if (EXT4_I(inode)->i_extra_isize == 0)
103 return 0;
104
105 error = ext4_get_inode_loc(inode, &iloc);
106 if (error) {
107 ext4_error_inode(inode, __func__, __LINE__, 0,
108 "can't get inode location %lu",
109 inode->i_ino);
110 return 0;
111 }
112
113 down_read(&EXT4_I(inode)->xattr_sem);
114 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
115 up_read(&EXT4_I(inode)->xattr_sem);
116
117 brelse(iloc.bh);
118
119 if (!max_inline_size)
120 return 0;
121
122 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
123}
124
125/*
126 * this function does not take xattr_sem, which is OK because it is
127 * currently only used in a code path coming form ext4_iget, before
128 * the new inode has been unlocked
129 */
130int ext4_find_inline_data_nolock(struct inode *inode)
131{
132 struct ext4_xattr_ibody_find is = {
133 .s = { .not_found = -ENODATA, },
134 };
135 struct ext4_xattr_info i = {
136 .name_index = EXT4_XATTR_INDEX_SYSTEM,
137 .name = EXT4_XATTR_SYSTEM_DATA,
138 };
139 int error;
140
141 if (EXT4_I(inode)->i_extra_isize == 0)
142 return 0;
143
144 error = ext4_get_inode_loc(inode, &is.iloc);
145 if (error)
146 return error;
147
148 error = ext4_xattr_ibody_find(inode, &i, &is);
149 if (error)
150 goto out;
151
152 if (!is.s.not_found) {
153 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
154 (void *)ext4_raw_inode(&is.iloc));
155 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
156 le32_to_cpu(is.s.here->e_value_size);
157 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
158 }
159out:
160 brelse(is.iloc.bh);
161 return error;
162}
163
164static int ext4_read_inline_data(struct inode *inode, void *buffer,
165 unsigned int len,
166 struct ext4_iloc *iloc)
167{
168 struct ext4_xattr_entry *entry;
169 struct ext4_xattr_ibody_header *header;
170 int cp_len = 0;
171 struct ext4_inode *raw_inode;
172
173 if (!len)
174 return 0;
175
176 BUG_ON(len > EXT4_I(inode)->i_inline_size);
177
178 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
179 len : EXT4_MIN_INLINE_DATA_SIZE;
180
181 raw_inode = ext4_raw_inode(iloc);
182 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
183
184 len -= cp_len;
185 buffer += cp_len;
186
187 if (!len)
188 goto out;
189
190 header = IHDR(inode, raw_inode);
191 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
192 EXT4_I(inode)->i_inline_off);
193 len = min_t(unsigned int, len,
194 (unsigned int)le32_to_cpu(entry->e_value_size));
195
196 memcpy(buffer,
197 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
198 cp_len += len;
199
200out:
201 return cp_len;
202}
203
204/*
205 * write the buffer to the inline inode.
206 * If 'create' is set, we don't need to do the extra copy in the xattr
207 * value since it is already handled by ext4_xattr_ibody_inline_set.
208 * That saves us one memcpy.
209 */
210static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
211 void *buffer, loff_t pos, unsigned int len)
212{
213 struct ext4_xattr_entry *entry;
214 struct ext4_xattr_ibody_header *header;
215 struct ext4_inode *raw_inode;
216 int cp_len = 0;
217
218 BUG_ON(!EXT4_I(inode)->i_inline_off);
219 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
220
221 raw_inode = ext4_raw_inode(iloc);
222 buffer += pos;
223
224 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
225 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
226 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
227 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
228
229 len -= cp_len;
230 buffer += cp_len;
231 pos += cp_len;
232 }
233
234 if (!len)
235 return;
236
237 pos -= EXT4_MIN_INLINE_DATA_SIZE;
238 header = IHDR(inode, raw_inode);
239 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
240 EXT4_I(inode)->i_inline_off);
241
242 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
243 buffer, len);
244}
245
246static int ext4_create_inline_data(handle_t *handle,
247 struct inode *inode, unsigned len)
248{
249 int error;
250 void *value = NULL;
251 struct ext4_xattr_ibody_find is = {
252 .s = { .not_found = -ENODATA, },
253 };
254 struct ext4_xattr_info i = {
255 .name_index = EXT4_XATTR_INDEX_SYSTEM,
256 .name = EXT4_XATTR_SYSTEM_DATA,
257 };
258
259 error = ext4_get_inode_loc(inode, &is.iloc);
260 if (error)
261 return error;
262
263 BUFFER_TRACE(is.iloc.bh, "get_write_access");
264 error = ext4_journal_get_write_access(handle, is.iloc.bh);
265 if (error)
266 goto out;
267
268 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
269 value = EXT4_ZERO_XATTR_VALUE;
270 len -= EXT4_MIN_INLINE_DATA_SIZE;
271 } else {
272 value = "";
273 len = 0;
274 }
275
276 /* Insert the the xttr entry. */
277 i.value = value;
278 i.value_len = len;
279
280 error = ext4_xattr_ibody_find(inode, &i, &is);
281 if (error)
282 goto out;
283
284 BUG_ON(!is.s.not_found);
285
286 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
287 if (error) {
288 if (error == -ENOSPC)
289 ext4_clear_inode_state(inode,
290 EXT4_STATE_MAY_INLINE_DATA);
291 goto out;
292 }
293
294 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
295 0, EXT4_MIN_INLINE_DATA_SIZE);
296
297 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
298 (void *)ext4_raw_inode(&is.iloc));
299 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
300 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
301 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
302 /*
303 * Propagate changes to inode->i_flags as well - e.g. S_DAX may
304 * get cleared
305 */
306 ext4_set_inode_flags(inode);
307 get_bh(is.iloc.bh);
308 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
309
310out:
311 brelse(is.iloc.bh);
312 return error;
313}
314
315static 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, is.iloc.bh);
356 if (error)
357 goto out;
358
359 /* Update the xttr entry. */
360 i.value = value;
361 i.value_len = len;
362
363 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
364 if (error)
365 goto out;
366
367 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
368 (void *)ext4_raw_inode(&is.iloc));
369 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
370 le32_to_cpu(is.s.here->e_value_size);
371 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
372 get_bh(is.iloc.bh);
373 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
374
375out:
376 kfree(value);
377 brelse(is.iloc.bh);
378 return error;
379}
380
381static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
382 unsigned int len)
383{
384 int ret, size, no_expand;
385 struct ext4_inode_info *ei = EXT4_I(inode);
386
387 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
388 return -ENOSPC;
389
390 size = ext4_get_max_inline_size(inode);
391 if (size < len)
392 return -ENOSPC;
393
394 ext4_write_lock_xattr(inode, &no_expand);
395
396 if (ei->i_inline_off)
397 ret = ext4_update_inline_data(handle, inode, len);
398 else
399 ret = ext4_create_inline_data(handle, inode, len);
400
401 ext4_write_unlock_xattr(inode, &no_expand);
402 return ret;
403}
404
405static int ext4_destroy_inline_data_nolock(handle_t *handle,
406 struct inode *inode)
407{
408 struct ext4_inode_info *ei = EXT4_I(inode);
409 struct ext4_xattr_ibody_find is = {
410 .s = { .not_found = 0, },
411 };
412 struct ext4_xattr_info i = {
413 .name_index = EXT4_XATTR_INDEX_SYSTEM,
414 .name = EXT4_XATTR_SYSTEM_DATA,
415 .value = NULL,
416 .value_len = 0,
417 };
418 int error;
419
420 if (!ei->i_inline_off)
421 return 0;
422
423 error = ext4_get_inode_loc(inode, &is.iloc);
424 if (error)
425 return error;
426
427 error = ext4_xattr_ibody_find(inode, &i, &is);
428 if (error)
429 goto out;
430
431 BUFFER_TRACE(is.iloc.bh, "get_write_access");
432 error = ext4_journal_get_write_access(handle, is.iloc.bh);
433 if (error)
434 goto out;
435
436 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
437 if (error)
438 goto out;
439
440 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
441 0, EXT4_MIN_INLINE_DATA_SIZE);
442
443 if (ext4_has_feature_extents(inode->i_sb)) {
444 if (S_ISDIR(inode->i_mode) ||
445 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
446 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
447 ext4_ext_tree_init(handle, inode);
448 }
449 }
450 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
451 /*
452 * Propagate changes to inode->i_flags as well - e.g. S_DAX may
453 * get set.
454 */
455 ext4_set_inode_flags(inode);
456
457 get_bh(is.iloc.bh);
458 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
459
460 EXT4_I(inode)->i_inline_off = 0;
461 EXT4_I(inode)->i_inline_size = 0;
462 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
463out:
464 brelse(is.iloc.bh);
465 if (error == -ENODATA)
466 error = 0;
467 return error;
468}
469
470static int ext4_read_inline_page(struct inode *inode, struct page *page)
471{
472 void *kaddr;
473 int ret = 0;
474 size_t len;
475 struct ext4_iloc iloc;
476
477 BUG_ON(!PageLocked(page));
478 BUG_ON(!ext4_has_inline_data(inode));
479 BUG_ON(page->index);
480
481 if (!EXT4_I(inode)->i_inline_off) {
482 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
483 inode->i_ino);
484 goto out;
485 }
486
487 ret = ext4_get_inode_loc(inode, &iloc);
488 if (ret)
489 goto out;
490
491 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
492 kaddr = kmap_atomic(page);
493 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
494 flush_dcache_page(page);
495 kunmap_atomic(kaddr);
496 zero_user_segment(page, len, PAGE_SIZE);
497 SetPageUptodate(page);
498 brelse(iloc.bh);
499
500out:
501 return ret;
502}
503
504int ext4_readpage_inline(struct inode *inode, struct page *page)
505{
506 int ret = 0;
507
508 down_read(&EXT4_I(inode)->xattr_sem);
509 if (!ext4_has_inline_data(inode)) {
510 up_read(&EXT4_I(inode)->xattr_sem);
511 return -EAGAIN;
512 }
513
514 /*
515 * Current inline data can only exist in the 1st page,
516 * So for all the other pages, just set them uptodate.
517 */
518 if (!page->index)
519 ret = ext4_read_inline_page(inode, page);
520 else if (!PageUptodate(page)) {
521 zero_user_segment(page, 0, PAGE_SIZE);
522 SetPageUptodate(page);
523 }
524
525 up_read(&EXT4_I(inode)->xattr_sem);
526
527 unlock_page(page);
528 return ret >= 0 ? 0 : ret;
529}
530
531static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
532 struct inode *inode,
533 unsigned flags)
534{
535 int ret, needed_blocks, no_expand;
536 handle_t *handle = NULL;
537 int retries = 0, sem_held = 0;
538 struct page *page = NULL;
539 unsigned from, to;
540 struct ext4_iloc iloc;
541
542 if (!ext4_has_inline_data(inode)) {
543 /*
544 * clear the flag so that no new write
545 * will trap here again.
546 */
547 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
548 return 0;
549 }
550
551 needed_blocks = ext4_writepage_trans_blocks(inode);
552
553 ret = ext4_get_inode_loc(inode, &iloc);
554 if (ret)
555 return ret;
556
557retry:
558 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
559 if (IS_ERR(handle)) {
560 ret = PTR_ERR(handle);
561 handle = NULL;
562 goto out;
563 }
564
565 /* We cannot recurse into the filesystem as the transaction is already
566 * started */
567 flags |= AOP_FLAG_NOFS;
568
569 page = grab_cache_page_write_begin(mapping, 0, flags);
570 if (!page) {
571 ret = -ENOMEM;
572 goto out;
573 }
574
575 ext4_write_lock_xattr(inode, &no_expand);
576 sem_held = 1;
577 /* If some one has already done this for us, just exit. */
578 if (!ext4_has_inline_data(inode)) {
579 ret = 0;
580 goto out;
581 }
582
583 from = 0;
584 to = ext4_get_inline_size(inode);
585 if (!PageUptodate(page)) {
586 ret = ext4_read_inline_page(inode, page);
587 if (ret < 0)
588 goto out;
589 }
590
591 ret = ext4_destroy_inline_data_nolock(handle, inode);
592 if (ret)
593 goto out;
594
595 if (ext4_should_dioread_nolock(inode)) {
596 ret = __block_write_begin(page, from, to,
597 ext4_get_block_unwritten);
598 } else
599 ret = __block_write_begin(page, from, to, ext4_get_block);
600
601 if (!ret && ext4_should_journal_data(inode)) {
602 ret = ext4_walk_page_buffers(handle, page_buffers(page),
603 from, to, NULL,
604 do_journal_get_write_access);
605 }
606
607 if (ret) {
608 unlock_page(page);
609 put_page(page);
610 page = NULL;
611 ext4_orphan_add(handle, inode);
612 ext4_write_unlock_xattr(inode, &no_expand);
613 sem_held = 0;
614 ext4_journal_stop(handle);
615 handle = NULL;
616 ext4_truncate_failed_write(inode);
617 /*
618 * If truncate failed early the inode might
619 * still be on the orphan list; we need to
620 * make sure the inode is removed from the
621 * orphan list in that case.
622 */
623 if (inode->i_nlink)
624 ext4_orphan_del(NULL, inode);
625 }
626
627 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
628 goto retry;
629
630 if (page)
631 block_commit_write(page, from, to);
632out:
633 if (page) {
634 unlock_page(page);
635 put_page(page);
636 }
637 if (sem_held)
638 ext4_write_unlock_xattr(inode, &no_expand);
639 if (handle)
640 ext4_journal_stop(handle);
641 brelse(iloc.bh);
642 return ret;
643}
644
645/*
646 * Try to write data in the inode.
647 * If the inode has inline data, check whether the new write can be
648 * in the inode also. If not, create the page the handle, move the data
649 * to the page make it update and let the later codes create extent for it.
650 */
651int ext4_try_to_write_inline_data(struct address_space *mapping,
652 struct inode *inode,
653 loff_t pos, unsigned len,
654 unsigned flags,
655 struct page **pagep)
656{
657 int ret;
658 handle_t *handle;
659 struct page *page;
660 struct ext4_iloc iloc;
661
662 if (pos + len > ext4_get_max_inline_size(inode))
663 goto convert;
664
665 ret = ext4_get_inode_loc(inode, &iloc);
666 if (ret)
667 return ret;
668
669 /*
670 * The possible write could happen in the inode,
671 * so try to reserve the space in inode first.
672 */
673 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
674 if (IS_ERR(handle)) {
675 ret = PTR_ERR(handle);
676 handle = NULL;
677 goto out;
678 }
679
680 ret = ext4_prepare_inline_data(handle, inode, pos + len);
681 if (ret && ret != -ENOSPC)
682 goto out;
683
684 /* We don't have space in inline inode, so convert it to extent. */
685 if (ret == -ENOSPC) {
686 ext4_journal_stop(handle);
687 brelse(iloc.bh);
688 goto convert;
689 }
690
691 flags |= AOP_FLAG_NOFS;
692
693 page = grab_cache_page_write_begin(mapping, 0, flags);
694 if (!page) {
695 ret = -ENOMEM;
696 goto out;
697 }
698
699 *pagep = page;
700 down_read(&EXT4_I(inode)->xattr_sem);
701 if (!ext4_has_inline_data(inode)) {
702 ret = 0;
703 unlock_page(page);
704 put_page(page);
705 goto out_up_read;
706 }
707
708 if (!PageUptodate(page)) {
709 ret = ext4_read_inline_page(inode, page);
710 if (ret < 0)
711 goto out_up_read;
712 }
713
714 ret = 1;
715 handle = NULL;
716out_up_read:
717 up_read(&EXT4_I(inode)->xattr_sem);
718out:
719 if (handle)
720 ext4_journal_stop(handle);
721 brelse(iloc.bh);
722 return ret;
723convert:
724 return ext4_convert_inline_data_to_extent(mapping,
725 inode, flags);
726}
727
728int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
729 unsigned copied, struct page *page)
730{
731 int ret, no_expand;
732 void *kaddr;
733 struct ext4_iloc iloc;
734
735 if (unlikely(copied < len)) {
736 if (!PageUptodate(page)) {
737 copied = 0;
738 goto out;
739 }
740 }
741
742 ret = ext4_get_inode_loc(inode, &iloc);
743 if (ret) {
744 ext4_std_error(inode->i_sb, ret);
745 copied = 0;
746 goto out;
747 }
748
749 ext4_write_lock_xattr(inode, &no_expand);
750 BUG_ON(!ext4_has_inline_data(inode));
751
752 kaddr = kmap_atomic(page);
753 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
754 kunmap_atomic(kaddr);
755 SetPageUptodate(page);
756 /* clear page dirty so that writepages wouldn't work for us. */
757 ClearPageDirty(page);
758
759 ext4_write_unlock_xattr(inode, &no_expand);
760 brelse(iloc.bh);
761out:
762 return copied;
763}
764
765struct buffer_head *
766ext4_journalled_write_inline_data(struct inode *inode,
767 unsigned len,
768 struct page *page)
769{
770 int ret, no_expand;
771 void *kaddr;
772 struct ext4_iloc iloc;
773
774 ret = ext4_get_inode_loc(inode, &iloc);
775 if (ret) {
776 ext4_std_error(inode->i_sb, ret);
777 return NULL;
778 }
779
780 ext4_write_lock_xattr(inode, &no_expand);
781 kaddr = kmap_atomic(page);
782 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
783 kunmap_atomic(kaddr);
784 ext4_write_unlock_xattr(inode, &no_expand);
785
786 return iloc.bh;
787}
788
789/*
790 * Try to make the page cache and handle ready for the inline data case.
791 * We can call this function in 2 cases:
792 * 1. The inode is created and the first write exceeds inline size. We can
793 * clear the inode state safely.
794 * 2. The inode has inline data, then we need to read the data, make it
795 * update and dirty so that ext4_da_writepages can handle it. We don't
796 * need to start the journal since the file's metatdata isn't changed now.
797 */
798static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
799 struct inode *inode,
800 unsigned flags,
801 void **fsdata)
802{
803 int ret = 0, inline_size;
804 struct page *page;
805
806 page = grab_cache_page_write_begin(mapping, 0, flags);
807 if (!page)
808 return -ENOMEM;
809
810 down_read(&EXT4_I(inode)->xattr_sem);
811 if (!ext4_has_inline_data(inode)) {
812 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
813 goto out;
814 }
815
816 inline_size = ext4_get_inline_size(inode);
817
818 if (!PageUptodate(page)) {
819 ret = ext4_read_inline_page(inode, page);
820 if (ret < 0)
821 goto out;
822 }
823
824 ret = __block_write_begin(page, 0, inline_size,
825 ext4_da_get_block_prep);
826 if (ret) {
827 up_read(&EXT4_I(inode)->xattr_sem);
828 unlock_page(page);
829 put_page(page);
830 ext4_truncate_failed_write(inode);
831 return ret;
832 }
833
834 SetPageDirty(page);
835 SetPageUptodate(page);
836 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
837 *fsdata = (void *)CONVERT_INLINE_DATA;
838
839out:
840 up_read(&EXT4_I(inode)->xattr_sem);
841 if (page) {
842 unlock_page(page);
843 put_page(page);
844 }
845 return ret;
846}
847
848/*
849 * Prepare the write for the inline data.
850 * If the the data can be written into the inode, we just read
851 * the page and make it uptodate, and start the journal.
852 * Otherwise read the page, makes it dirty so that it can be
853 * handle in writepages(the i_disksize update is left to the
854 * normal ext4_da_write_end).
855 */
856int ext4_da_write_inline_data_begin(struct address_space *mapping,
857 struct inode *inode,
858 loff_t pos, unsigned len,
859 unsigned flags,
860 struct page **pagep,
861 void **fsdata)
862{
863 int ret, inline_size;
864 handle_t *handle;
865 struct page *page;
866 struct ext4_iloc iloc;
867 int retries;
868
869 ret = ext4_get_inode_loc(inode, &iloc);
870 if (ret)
871 return ret;
872
873retry_journal:
874 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
875 if (IS_ERR(handle)) {
876 ret = PTR_ERR(handle);
877 goto out;
878 }
879
880 inline_size = ext4_get_max_inline_size(inode);
881
882 ret = -ENOSPC;
883 if (inline_size >= pos + len) {
884 ret = ext4_prepare_inline_data(handle, inode, pos + len);
885 if (ret && ret != -ENOSPC)
886 goto out_journal;
887 }
888
889 /*
890 * We cannot recurse into the filesystem as the transaction
891 * is already started.
892 */
893 flags |= AOP_FLAG_NOFS;
894
895 if (ret == -ENOSPC) {
896 ret = ext4_da_convert_inline_data_to_extent(mapping,
897 inode,
898 flags,
899 fsdata);
900 ext4_journal_stop(handle);
901 if (ret == -ENOSPC &&
902 ext4_should_retry_alloc(inode->i_sb, &retries))
903 goto retry_journal;
904 goto out;
905 }
906
907
908 page = grab_cache_page_write_begin(mapping, 0, flags);
909 if (!page) {
910 ret = -ENOMEM;
911 goto out_journal;
912 }
913
914 down_read(&EXT4_I(inode)->xattr_sem);
915 if (!ext4_has_inline_data(inode)) {
916 ret = 0;
917 goto out_release_page;
918 }
919
920 if (!PageUptodate(page)) {
921 ret = ext4_read_inline_page(inode, page);
922 if (ret < 0)
923 goto out_release_page;
924 }
925
926 up_read(&EXT4_I(inode)->xattr_sem);
927 *pagep = page;
928 brelse(iloc.bh);
929 return 1;
930out_release_page:
931 up_read(&EXT4_I(inode)->xattr_sem);
932 unlock_page(page);
933 put_page(page);
934out_journal:
935 ext4_journal_stop(handle);
936out:
937 brelse(iloc.bh);
938 return ret;
939}
940
941int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
942 unsigned len, unsigned copied,
943 struct page *page)
944{
945 int i_size_changed = 0;
946 int ret;
947
948 ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
949 if (ret < 0) {
950 unlock_page(page);
951 put_page(page);
952 return ret;
953 }
954 copied = ret;
955
956 /*
957 * No need to use i_size_read() here, the i_size
958 * cannot change under us because we hold i_mutex.
959 *
960 * But it's important to update i_size while still holding page lock:
961 * page writeout could otherwise come in and zero beyond i_size.
962 */
963 if (pos+copied > inode->i_size) {
964 i_size_write(inode, pos+copied);
965 i_size_changed = 1;
966 }
967 unlock_page(page);
968 put_page(page);
969
970 /*
971 * Don't mark the inode dirty under page lock. First, it unnecessarily
972 * makes the holding time of page lock longer. Second, it forces lock
973 * ordering of page lock and transaction start for journaling
974 * filesystems.
975 */
976 if (i_size_changed)
977 mark_inode_dirty(inode);
978
979 return copied;
980}
981
982#ifdef INLINE_DIR_DEBUG
983void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
984 void *inline_start, int inline_size)
985{
986 int offset;
987 unsigned short de_len;
988 struct ext4_dir_entry_2 *de = inline_start;
989 void *dlimit = inline_start + inline_size;
990
991 trace_printk("inode %lu\n", dir->i_ino);
992 offset = 0;
993 while ((void *)de < dlimit) {
994 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
995 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
996 offset, de_len, de->name_len, de->name,
997 de->name_len, le32_to_cpu(de->inode));
998 if (ext4_check_dir_entry(dir, NULL, de, bh,
999 inline_start, inline_size, offset))
1000 BUG();
1001
1002 offset += de_len;
1003 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1004 }
1005}
1006#else
1007#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1008#endif
1009
1010/*
1011 * Add a new entry into a inline dir.
1012 * It will return -ENOSPC if no space is available, and -EIO
1013 * and -EEXIST if directory entry already exists.
1014 */
1015static int ext4_add_dirent_to_inline(handle_t *handle,
1016 struct ext4_filename *fname,
1017 struct inode *dir,
1018 struct inode *inode,
1019 struct ext4_iloc *iloc,
1020 void *inline_start, int inline_size)
1021{
1022 int err;
1023 struct ext4_dir_entry_2 *de;
1024
1025 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1026 inline_size, fname, &de);
1027 if (err)
1028 return err;
1029
1030 BUFFER_TRACE(iloc->bh, "get_write_access");
1031 err = ext4_journal_get_write_access(handle, iloc->bh);
1032 if (err)
1033 return err;
1034 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1035
1036 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1037
1038 /*
1039 * XXX shouldn't update any times until successful
1040 * completion of syscall, but too many callers depend
1041 * on this.
1042 *
1043 * XXX similarly, too many callers depend on
1044 * ext4_new_inode() setting the times, but error
1045 * recovery deletes the inode, so the worst that can
1046 * happen is that the times are slightly out of date
1047 * and/or different from the directory change time.
1048 */
1049 dir->i_mtime = dir->i_ctime = current_time(dir);
1050 ext4_update_dx_flag(dir);
1051 dir->i_version++;
1052 ext4_mark_inode_dirty(handle, dir);
1053 return 1;
1054}
1055
1056static void *ext4_get_inline_xattr_pos(struct inode *inode,
1057 struct ext4_iloc *iloc)
1058{
1059 struct ext4_xattr_entry *entry;
1060 struct ext4_xattr_ibody_header *header;
1061
1062 BUG_ON(!EXT4_I(inode)->i_inline_off);
1063
1064 header = IHDR(inode, ext4_raw_inode(iloc));
1065 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1066 EXT4_I(inode)->i_inline_off);
1067
1068 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1069}
1070
1071/* Set the final de to cover the whole block. */
1072static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1073{
1074 struct ext4_dir_entry_2 *de, *prev_de;
1075 void *limit;
1076 int de_len;
1077
1078 de = (struct ext4_dir_entry_2 *)de_buf;
1079 if (old_size) {
1080 limit = de_buf + old_size;
1081 do {
1082 prev_de = de;
1083 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1084 de_buf += de_len;
1085 de = (struct ext4_dir_entry_2 *)de_buf;
1086 } while (de_buf < limit);
1087
1088 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1089 old_size, new_size);
1090 } else {
1091 /* this is just created, so create an empty entry. */
1092 de->inode = 0;
1093 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1094 }
1095}
1096
1097static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1098 struct ext4_iloc *iloc)
1099{
1100 int ret;
1101 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1102 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1103
1104 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1105 return -ENOSPC;
1106
1107 ret = ext4_update_inline_data(handle, dir,
1108 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1109 if (ret)
1110 return ret;
1111
1112 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1113 EXT4_I(dir)->i_inline_size -
1114 EXT4_MIN_INLINE_DATA_SIZE);
1115 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1116 return 0;
1117}
1118
1119static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1120 struct ext4_iloc *iloc,
1121 void *buf, int inline_size)
1122{
1123 ext4_create_inline_data(handle, inode, inline_size);
1124 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1125 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1126}
1127
1128static int ext4_finish_convert_inline_dir(handle_t *handle,
1129 struct inode *inode,
1130 struct buffer_head *dir_block,
1131 void *buf,
1132 int inline_size)
1133{
1134 int err, csum_size = 0, header_size = 0;
1135 struct ext4_dir_entry_2 *de;
1136 struct ext4_dir_entry_tail *t;
1137 void *target = dir_block->b_data;
1138
1139 /*
1140 * First create "." and ".." and then copy the dir information
1141 * back to the block.
1142 */
1143 de = (struct ext4_dir_entry_2 *)target;
1144 de = ext4_init_dot_dotdot(inode, de,
1145 inode->i_sb->s_blocksize, csum_size,
1146 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1147 header_size = (void *)de - target;
1148
1149 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1150 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1151
1152 if (ext4_has_metadata_csum(inode->i_sb))
1153 csum_size = sizeof(struct ext4_dir_entry_tail);
1154
1155 inode->i_size = inode->i_sb->s_blocksize;
1156 i_size_write(inode, inode->i_sb->s_blocksize);
1157 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1158 ext4_update_final_de(dir_block->b_data,
1159 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1160 inode->i_sb->s_blocksize - csum_size);
1161
1162 if (csum_size) {
1163 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1164 inode->i_sb->s_blocksize);
1165 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1166 }
1167 set_buffer_uptodate(dir_block);
1168 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1169 if (err)
1170 return err;
1171 set_buffer_verified(dir_block);
1172 return ext4_mark_inode_dirty(handle, inode);
1173}
1174
1175static int ext4_convert_inline_data_nolock(handle_t *handle,
1176 struct inode *inode,
1177 struct ext4_iloc *iloc)
1178{
1179 int error;
1180 void *buf = NULL;
1181 struct buffer_head *data_bh = NULL;
1182 struct ext4_map_blocks map;
1183 int inline_size;
1184
1185 inline_size = ext4_get_inline_size(inode);
1186 buf = kmalloc(inline_size, GFP_NOFS);
1187 if (!buf) {
1188 error = -ENOMEM;
1189 goto out;
1190 }
1191
1192 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1193 if (error < 0)
1194 goto out;
1195
1196 /*
1197 * Make sure the inline directory entries pass checks before we try to
1198 * convert them, so that we avoid touching stuff that needs fsck.
1199 */
1200 if (S_ISDIR(inode->i_mode)) {
1201 error = ext4_check_all_de(inode, iloc->bh,
1202 buf + EXT4_INLINE_DOTDOT_SIZE,
1203 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1204 if (error)
1205 goto out;
1206 }
1207
1208 error = ext4_destroy_inline_data_nolock(handle, inode);
1209 if (error)
1210 goto out;
1211
1212 map.m_lblk = 0;
1213 map.m_len = 1;
1214 map.m_flags = 0;
1215 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1216 if (error < 0)
1217 goto out_restore;
1218 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1219 error = -EIO;
1220 goto out_restore;
1221 }
1222
1223 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1224 if (!data_bh) {
1225 error = -ENOMEM;
1226 goto out_restore;
1227 }
1228
1229 lock_buffer(data_bh);
1230 error = ext4_journal_get_create_access(handle, data_bh);
1231 if (error) {
1232 unlock_buffer(data_bh);
1233 error = -EIO;
1234 goto out_restore;
1235 }
1236 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1237
1238 if (!S_ISDIR(inode->i_mode)) {
1239 memcpy(data_bh->b_data, buf, inline_size);
1240 set_buffer_uptodate(data_bh);
1241 error = ext4_handle_dirty_metadata(handle,
1242 inode, data_bh);
1243 } else {
1244 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1245 buf, inline_size);
1246 }
1247
1248 unlock_buffer(data_bh);
1249out_restore:
1250 if (error)
1251 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1252
1253out:
1254 brelse(data_bh);
1255 kfree(buf);
1256 return error;
1257}
1258
1259/*
1260 * Try to add the new entry to the inline data.
1261 * If succeeds, return 0. If not, extended the inline dir and copied data to
1262 * the new created block.
1263 */
1264int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1265 struct inode *dir, struct inode *inode)
1266{
1267 int ret, inline_size, no_expand;
1268 void *inline_start;
1269 struct ext4_iloc iloc;
1270
1271 ret = ext4_get_inode_loc(dir, &iloc);
1272 if (ret)
1273 return ret;
1274
1275 ext4_write_lock_xattr(dir, &no_expand);
1276 if (!ext4_has_inline_data(dir))
1277 goto out;
1278
1279 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1280 EXT4_INLINE_DOTDOT_SIZE;
1281 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1282
1283 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1284 inline_start, inline_size);
1285 if (ret != -ENOSPC)
1286 goto out;
1287
1288 /* check whether it can be inserted to inline xattr space. */
1289 inline_size = EXT4_I(dir)->i_inline_size -
1290 EXT4_MIN_INLINE_DATA_SIZE;
1291 if (!inline_size) {
1292 /* Try to use the xattr space.*/
1293 ret = ext4_update_inline_dir(handle, dir, &iloc);
1294 if (ret && ret != -ENOSPC)
1295 goto out;
1296
1297 inline_size = EXT4_I(dir)->i_inline_size -
1298 EXT4_MIN_INLINE_DATA_SIZE;
1299 }
1300
1301 if (inline_size) {
1302 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1303
1304 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1305 inode, &iloc, inline_start,
1306 inline_size);
1307
1308 if (ret != -ENOSPC)
1309 goto out;
1310 }
1311
1312 /*
1313 * The inline space is filled up, so create a new block for it.
1314 * As the extent tree will be created, we have to save the inline
1315 * dir first.
1316 */
1317 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1318
1319out:
1320 ext4_mark_inode_dirty(handle, dir);
1321 ext4_write_unlock_xattr(dir, &no_expand);
1322 brelse(iloc.bh);
1323 return ret;
1324}
1325
1326/*
1327 * This function fills a red-black tree with information from an
1328 * inlined dir. It returns the number directory entries loaded
1329 * into the tree. If there is an error it is returned in err.
1330 */
1331int htree_inlinedir_to_tree(struct file *dir_file,
1332 struct inode *dir, ext4_lblk_t block,
1333 struct dx_hash_info *hinfo,
1334 __u32 start_hash, __u32 start_minor_hash,
1335 int *has_inline_data)
1336{
1337 int err = 0, count = 0;
1338 unsigned int parent_ino;
1339 int pos;
1340 struct ext4_dir_entry_2 *de;
1341 struct inode *inode = file_inode(dir_file);
1342 int ret, inline_size = 0;
1343 struct ext4_iloc iloc;
1344 void *dir_buf = NULL;
1345 struct ext4_dir_entry_2 fake;
1346 struct fscrypt_str tmp_str;
1347
1348 ret = ext4_get_inode_loc(inode, &iloc);
1349 if (ret)
1350 return ret;
1351
1352 down_read(&EXT4_I(inode)->xattr_sem);
1353 if (!ext4_has_inline_data(inode)) {
1354 up_read(&EXT4_I(inode)->xattr_sem);
1355 *has_inline_data = 0;
1356 goto out;
1357 }
1358
1359 inline_size = ext4_get_inline_size(inode);
1360 dir_buf = kmalloc(inline_size, GFP_NOFS);
1361 if (!dir_buf) {
1362 ret = -ENOMEM;
1363 up_read(&EXT4_I(inode)->xattr_sem);
1364 goto out;
1365 }
1366
1367 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1368 up_read(&EXT4_I(inode)->xattr_sem);
1369 if (ret < 0)
1370 goto out;
1371
1372 pos = 0;
1373 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1374 while (pos < inline_size) {
1375 /*
1376 * As inlined dir doesn't store any information about '.' and
1377 * only the inode number of '..' is stored, we have to handle
1378 * them differently.
1379 */
1380 if (pos == 0) {
1381 fake.inode = cpu_to_le32(inode->i_ino);
1382 fake.name_len = 1;
1383 strcpy(fake.name, ".");
1384 fake.rec_len = ext4_rec_len_to_disk(
1385 EXT4_DIR_REC_LEN(fake.name_len),
1386 inline_size);
1387 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1388 de = &fake;
1389 pos = EXT4_INLINE_DOTDOT_OFFSET;
1390 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1391 fake.inode = cpu_to_le32(parent_ino);
1392 fake.name_len = 2;
1393 strcpy(fake.name, "..");
1394 fake.rec_len = ext4_rec_len_to_disk(
1395 EXT4_DIR_REC_LEN(fake.name_len),
1396 inline_size);
1397 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1398 de = &fake;
1399 pos = EXT4_INLINE_DOTDOT_SIZE;
1400 } else {
1401 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1402 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1403 if (ext4_check_dir_entry(inode, dir_file, de,
1404 iloc.bh, dir_buf,
1405 inline_size, pos)) {
1406 ret = count;
1407 goto out;
1408 }
1409 }
1410
1411 ext4fs_dirhash(de->name, de->name_len, hinfo);
1412 if ((hinfo->hash < start_hash) ||
1413 ((hinfo->hash == start_hash) &&
1414 (hinfo->minor_hash < start_minor_hash)))
1415 continue;
1416 if (de->inode == 0)
1417 continue;
1418 tmp_str.name = de->name;
1419 tmp_str.len = de->name_len;
1420 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1421 hinfo->minor_hash, de, &tmp_str);
1422 if (err) {
1423 count = err;
1424 goto out;
1425 }
1426 count++;
1427 }
1428 ret = count;
1429out:
1430 kfree(dir_buf);
1431 brelse(iloc.bh);
1432 return ret;
1433}
1434
1435/*
1436 * So this function is called when the volume is mkfsed with
1437 * dir_index disabled. In order to keep f_pos persistent
1438 * after we convert from an inlined dir to a blocked based,
1439 * we just pretend that we are a normal dir and return the
1440 * offset as if '.' and '..' really take place.
1441 *
1442 */
1443int ext4_read_inline_dir(struct file *file,
1444 struct dir_context *ctx,
1445 int *has_inline_data)
1446{
1447 unsigned int offset, parent_ino;
1448 int i;
1449 struct ext4_dir_entry_2 *de;
1450 struct super_block *sb;
1451 struct inode *inode = file_inode(file);
1452 int ret, inline_size = 0;
1453 struct ext4_iloc iloc;
1454 void *dir_buf = NULL;
1455 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1456
1457 ret = ext4_get_inode_loc(inode, &iloc);
1458 if (ret)
1459 return ret;
1460
1461 down_read(&EXT4_I(inode)->xattr_sem);
1462 if (!ext4_has_inline_data(inode)) {
1463 up_read(&EXT4_I(inode)->xattr_sem);
1464 *has_inline_data = 0;
1465 goto out;
1466 }
1467
1468 inline_size = ext4_get_inline_size(inode);
1469 dir_buf = kmalloc(inline_size, GFP_NOFS);
1470 if (!dir_buf) {
1471 ret = -ENOMEM;
1472 up_read(&EXT4_I(inode)->xattr_sem);
1473 goto out;
1474 }
1475
1476 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1477 up_read(&EXT4_I(inode)->xattr_sem);
1478 if (ret < 0)
1479 goto out;
1480
1481 ret = 0;
1482 sb = inode->i_sb;
1483 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1484 offset = ctx->pos;
1485
1486 /*
1487 * dotdot_offset and dotdot_size is the real offset and
1488 * size for ".." and "." if the dir is block based while
1489 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1490 * So we will use extra_offset and extra_size to indicate them
1491 * during the inline dir iteration.
1492 */
1493 dotdot_offset = EXT4_DIR_REC_LEN(1);
1494 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1495 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1496 extra_size = extra_offset + inline_size;
1497
1498 /*
1499 * If the version has changed since the last call to
1500 * readdir(2), then we might be pointing to an invalid
1501 * dirent right now. Scan from the start of the inline
1502 * dir to make sure.
1503 */
1504 if (file->f_version != inode->i_version) {
1505 for (i = 0; i < extra_size && i < offset;) {
1506 /*
1507 * "." is with offset 0 and
1508 * ".." is dotdot_offset.
1509 */
1510 if (!i) {
1511 i = dotdot_offset;
1512 continue;
1513 } else if (i == dotdot_offset) {
1514 i = dotdot_size;
1515 continue;
1516 }
1517 /* for other entry, the real offset in
1518 * the buf has to be tuned accordingly.
1519 */
1520 de = (struct ext4_dir_entry_2 *)
1521 (dir_buf + i - extra_offset);
1522 /* It's too expensive to do a full
1523 * dirent test each time round this
1524 * loop, but we do have to test at
1525 * least that it is non-zero. A
1526 * failure will be detected in the
1527 * dirent test below. */
1528 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1529 < EXT4_DIR_REC_LEN(1))
1530 break;
1531 i += ext4_rec_len_from_disk(de->rec_len,
1532 extra_size);
1533 }
1534 offset = i;
1535 ctx->pos = offset;
1536 file->f_version = inode->i_version;
1537 }
1538
1539 while (ctx->pos < extra_size) {
1540 if (ctx->pos == 0) {
1541 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1542 goto out;
1543 ctx->pos = dotdot_offset;
1544 continue;
1545 }
1546
1547 if (ctx->pos == dotdot_offset) {
1548 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1549 goto out;
1550 ctx->pos = dotdot_size;
1551 continue;
1552 }
1553
1554 de = (struct ext4_dir_entry_2 *)
1555 (dir_buf + ctx->pos - extra_offset);
1556 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1557 extra_size, ctx->pos))
1558 goto out;
1559 if (le32_to_cpu(de->inode)) {
1560 if (!dir_emit(ctx, de->name, de->name_len,
1561 le32_to_cpu(de->inode),
1562 get_dtype(sb, de->file_type)))
1563 goto out;
1564 }
1565 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1566 }
1567out:
1568 kfree(dir_buf);
1569 brelse(iloc.bh);
1570 return ret;
1571}
1572
1573struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1574 struct ext4_dir_entry_2 **parent_de,
1575 int *retval)
1576{
1577 struct ext4_iloc iloc;
1578
1579 *retval = ext4_get_inode_loc(inode, &iloc);
1580 if (*retval)
1581 return NULL;
1582
1583 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1584
1585 return iloc.bh;
1586}
1587
1588/*
1589 * Try to create the inline data for the new dir.
1590 * If it succeeds, return 0, otherwise return the error.
1591 * In case of ENOSPC, the caller should create the normal disk layout dir.
1592 */
1593int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1594 struct inode *inode)
1595{
1596 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1597 struct ext4_iloc iloc;
1598 struct ext4_dir_entry_2 *de;
1599
1600 ret = ext4_get_inode_loc(inode, &iloc);
1601 if (ret)
1602 return ret;
1603
1604 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1605 if (ret)
1606 goto out;
1607
1608 /*
1609 * For inline dir, we only save the inode information for the ".."
1610 * and create a fake dentry to cover the left space.
1611 */
1612 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1613 de->inode = cpu_to_le32(parent->i_ino);
1614 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1615 de->inode = 0;
1616 de->rec_len = ext4_rec_len_to_disk(
1617 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1618 inline_size);
1619 set_nlink(inode, 2);
1620 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1621out:
1622 brelse(iloc.bh);
1623 return ret;
1624}
1625
1626struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1627 struct ext4_filename *fname,
1628 const struct qstr *d_name,
1629 struct ext4_dir_entry_2 **res_dir,
1630 int *has_inline_data)
1631{
1632 int ret;
1633 struct ext4_iloc iloc;
1634 void *inline_start;
1635 int inline_size;
1636
1637 if (ext4_get_inode_loc(dir, &iloc))
1638 return NULL;
1639
1640 down_read(&EXT4_I(dir)->xattr_sem);
1641 if (!ext4_has_inline_data(dir)) {
1642 *has_inline_data = 0;
1643 goto out;
1644 }
1645
1646 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1647 EXT4_INLINE_DOTDOT_SIZE;
1648 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1649 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1650 dir, fname, d_name, 0, res_dir);
1651 if (ret == 1)
1652 goto out_find;
1653 if (ret < 0)
1654 goto out;
1655
1656 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1657 goto out;
1658
1659 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1660 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1661
1662 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1663 dir, fname, d_name, 0, res_dir);
1664 if (ret == 1)
1665 goto out_find;
1666
1667out:
1668 brelse(iloc.bh);
1669 iloc.bh = NULL;
1670out_find:
1671 up_read(&EXT4_I(dir)->xattr_sem);
1672 return iloc.bh;
1673}
1674
1675int ext4_delete_inline_entry(handle_t *handle,
1676 struct inode *dir,
1677 struct ext4_dir_entry_2 *de_del,
1678 struct buffer_head *bh,
1679 int *has_inline_data)
1680{
1681 int err, inline_size, no_expand;
1682 struct ext4_iloc iloc;
1683 void *inline_start;
1684
1685 err = ext4_get_inode_loc(dir, &iloc);
1686 if (err)
1687 return err;
1688
1689 ext4_write_lock_xattr(dir, &no_expand);
1690 if (!ext4_has_inline_data(dir)) {
1691 *has_inline_data = 0;
1692 goto out;
1693 }
1694
1695 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1696 EXT4_MIN_INLINE_DATA_SIZE) {
1697 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1698 EXT4_INLINE_DOTDOT_SIZE;
1699 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1700 EXT4_INLINE_DOTDOT_SIZE;
1701 } else {
1702 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1703 inline_size = ext4_get_inline_size(dir) -
1704 EXT4_MIN_INLINE_DATA_SIZE;
1705 }
1706
1707 BUFFER_TRACE(bh, "get_write_access");
1708 err = ext4_journal_get_write_access(handle, bh);
1709 if (err)
1710 goto out;
1711
1712 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1713 inline_start, inline_size, 0);
1714 if (err)
1715 goto out;
1716
1717 err = ext4_mark_inode_dirty(handle, dir);
1718 if (unlikely(err))
1719 goto out;
1720
1721 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1722out:
1723 ext4_write_unlock_xattr(dir, &no_expand);
1724 brelse(iloc.bh);
1725 if (err != -ENOENT)
1726 ext4_std_error(dir->i_sb, err);
1727 return err;
1728}
1729
1730/*
1731 * Get the inline dentry at offset.
1732 */
1733static inline struct ext4_dir_entry_2 *
1734ext4_get_inline_entry(struct inode *inode,
1735 struct ext4_iloc *iloc,
1736 unsigned int offset,
1737 void **inline_start,
1738 int *inline_size)
1739{
1740 void *inline_pos;
1741
1742 BUG_ON(offset > ext4_get_inline_size(inode));
1743
1744 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1745 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1746 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1747 } else {
1748 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1749 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1750 *inline_size = ext4_get_inline_size(inode) -
1751 EXT4_MIN_INLINE_DATA_SIZE;
1752 }
1753
1754 if (inline_start)
1755 *inline_start = inline_pos;
1756 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1757}
1758
1759bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1760{
1761 int err, inline_size;
1762 struct ext4_iloc iloc;
1763 void *inline_pos;
1764 unsigned int offset;
1765 struct ext4_dir_entry_2 *de;
1766 bool ret = true;
1767
1768 err = ext4_get_inode_loc(dir, &iloc);
1769 if (err) {
1770 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1771 err, dir->i_ino);
1772 return true;
1773 }
1774
1775 down_read(&EXT4_I(dir)->xattr_sem);
1776 if (!ext4_has_inline_data(dir)) {
1777 *has_inline_data = 0;
1778 goto out;
1779 }
1780
1781 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1782 if (!le32_to_cpu(de->inode)) {
1783 ext4_warning(dir->i_sb,
1784 "bad inline directory (dir #%lu) - no `..'",
1785 dir->i_ino);
1786 ret = true;
1787 goto out;
1788 }
1789
1790 offset = EXT4_INLINE_DOTDOT_SIZE;
1791 while (offset < dir->i_size) {
1792 de = ext4_get_inline_entry(dir, &iloc, offset,
1793 &inline_pos, &inline_size);
1794 if (ext4_check_dir_entry(dir, NULL, de,
1795 iloc.bh, inline_pos,
1796 inline_size, offset)) {
1797 ext4_warning(dir->i_sb,
1798 "bad inline directory (dir #%lu) - "
1799 "inode %u, rec_len %u, name_len %d"
1800 "inline size %d",
1801 dir->i_ino, le32_to_cpu(de->inode),
1802 le16_to_cpu(de->rec_len), de->name_len,
1803 inline_size);
1804 ret = true;
1805 goto out;
1806 }
1807 if (le32_to_cpu(de->inode)) {
1808 ret = false;
1809 goto out;
1810 }
1811 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1812 }
1813
1814out:
1815 up_read(&EXT4_I(dir)->xattr_sem);
1816 brelse(iloc.bh);
1817 return ret;
1818}
1819
1820int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1821{
1822 int ret, no_expand;
1823
1824 ext4_write_lock_xattr(inode, &no_expand);
1825 ret = ext4_destroy_inline_data_nolock(handle, inode);
1826 ext4_write_unlock_xattr(inode, &no_expand);
1827
1828 return ret;
1829}
1830
1831int ext4_inline_data_fiemap(struct inode *inode,
1832 struct fiemap_extent_info *fieinfo,
1833 int *has_inline, __u64 start, __u64 len)
1834{
1835 __u64 physical = 0;
1836 __u64 inline_len;
1837 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1838 FIEMAP_EXTENT_LAST;
1839 int error = 0;
1840 struct ext4_iloc iloc;
1841
1842 down_read(&EXT4_I(inode)->xattr_sem);
1843 if (!ext4_has_inline_data(inode)) {
1844 *has_inline = 0;
1845 goto out;
1846 }
1847 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1848 i_size_read(inode));
1849 if (start >= inline_len)
1850 goto out;
1851 if (start + len < inline_len)
1852 inline_len = start + len;
1853 inline_len -= start;
1854
1855 error = ext4_get_inode_loc(inode, &iloc);
1856 if (error)
1857 goto out;
1858
1859 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1860 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1861 physical += offsetof(struct ext4_inode, i_block);
1862
1863 if (physical)
1864 error = fiemap_fill_next_extent(fieinfo, start, physical,
1865 inline_len, flags);
1866 brelse(iloc.bh);
1867out:
1868 up_read(&EXT4_I(inode)->xattr_sem);
1869 return (error < 0 ? error : 0);
1870}
1871
1872/*
1873 * Called during xattr set, and if we can sparse space 'needed',
1874 * just create the extent tree evict the data to the outer block.
1875 *
1876 * We use jbd2 instead of page cache to move data to the 1st block
1877 * so that the whole transaction can be committed as a whole and
1878 * the data isn't lost because of the delayed page cache write.
1879 */
1880int ext4_try_to_evict_inline_data(handle_t *handle,
1881 struct inode *inode,
1882 int needed)
1883{
1884 int error;
1885 struct ext4_xattr_entry *entry;
1886 struct ext4_inode *raw_inode;
1887 struct ext4_iloc iloc;
1888
1889 error = ext4_get_inode_loc(inode, &iloc);
1890 if (error)
1891 return error;
1892
1893 raw_inode = ext4_raw_inode(&iloc);
1894 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1895 EXT4_I(inode)->i_inline_off);
1896 if (EXT4_XATTR_LEN(entry->e_name_len) +
1897 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1898 error = -ENOSPC;
1899 goto out;
1900 }
1901
1902 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1903out:
1904 brelse(iloc.bh);
1905 return error;
1906}
1907
1908void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1909{
1910 handle_t *handle;
1911 int inline_size, value_len, needed_blocks, no_expand;
1912 size_t i_size;
1913 void *value = NULL;
1914 struct ext4_xattr_ibody_find is = {
1915 .s = { .not_found = -ENODATA, },
1916 };
1917 struct ext4_xattr_info i = {
1918 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1919 .name = EXT4_XATTR_SYSTEM_DATA,
1920 };
1921
1922
1923 needed_blocks = ext4_writepage_trans_blocks(inode);
1924 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1925 if (IS_ERR(handle))
1926 return;
1927
1928 ext4_write_lock_xattr(inode, &no_expand);
1929 if (!ext4_has_inline_data(inode)) {
1930 *has_inline = 0;
1931 ext4_journal_stop(handle);
1932 return;
1933 }
1934
1935 if (ext4_orphan_add(handle, inode))
1936 goto out;
1937
1938 if (ext4_get_inode_loc(inode, &is.iloc))
1939 goto out;
1940
1941 down_write(&EXT4_I(inode)->i_data_sem);
1942 i_size = inode->i_size;
1943 inline_size = ext4_get_inline_size(inode);
1944 EXT4_I(inode)->i_disksize = i_size;
1945
1946 if (i_size < inline_size) {
1947 /* Clear the content in the xattr space. */
1948 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1949 if (ext4_xattr_ibody_find(inode, &i, &is))
1950 goto out_error;
1951
1952 BUG_ON(is.s.not_found);
1953
1954 value_len = le32_to_cpu(is.s.here->e_value_size);
1955 value = kmalloc(value_len, GFP_NOFS);
1956 if (!value)
1957 goto out_error;
1958
1959 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1960 value, value_len))
1961 goto out_error;
1962
1963 i.value = value;
1964 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1965 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1966 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1967 goto out_error;
1968 }
1969
1970 /* Clear the content within i_blocks. */
1971 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1972 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1973 memset(p + i_size, 0,
1974 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1975 }
1976
1977 EXT4_I(inode)->i_inline_size = i_size <
1978 EXT4_MIN_INLINE_DATA_SIZE ?
1979 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1980 }
1981
1982out_error:
1983 up_write(&EXT4_I(inode)->i_data_sem);
1984out:
1985 brelse(is.iloc.bh);
1986 ext4_write_unlock_xattr(inode, &no_expand);
1987 kfree(value);
1988 if (inode->i_nlink)
1989 ext4_orphan_del(handle, inode);
1990
1991 inode->i_mtime = inode->i_ctime = current_time(inode);
1992 ext4_mark_inode_dirty(handle, inode);
1993 if (IS_SYNC(inode))
1994 ext4_handle_sync(handle);
1995
1996 ext4_journal_stop(handle);
1997 return;
1998}
1999
2000int ext4_convert_inline_data(struct inode *inode)
2001{
2002 int error, needed_blocks, no_expand;
2003 handle_t *handle;
2004 struct ext4_iloc iloc;
2005
2006 if (!ext4_has_inline_data(inode)) {
2007 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2008 return 0;
2009 }
2010
2011 needed_blocks = ext4_writepage_trans_blocks(inode);
2012
2013 iloc.bh = NULL;
2014 error = ext4_get_inode_loc(inode, &iloc);
2015 if (error)
2016 return error;
2017
2018 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2019 if (IS_ERR(handle)) {
2020 error = PTR_ERR(handle);
2021 goto out_free;
2022 }
2023
2024 ext4_write_lock_xattr(inode, &no_expand);
2025 if (ext4_has_inline_data(inode))
2026 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2027 ext4_write_unlock_xattr(inode, &no_expand);
2028 ext4_journal_stop(handle);
2029out_free:
2030 brelse(iloc.bh);
2031 return error;
2032}