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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 get_bh(is.iloc.bh);
303 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
304
305out:
306 brelse(is.iloc.bh);
307 return error;
308}
309
310static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
311 unsigned int len)
312{
313 int error;
314 void *value = NULL;
315 struct ext4_xattr_ibody_find is = {
316 .s = { .not_found = -ENODATA, },
317 };
318 struct ext4_xattr_info i = {
319 .name_index = EXT4_XATTR_INDEX_SYSTEM,
320 .name = EXT4_XATTR_SYSTEM_DATA,
321 };
322
323 /* If the old space is ok, write the data directly. */
324 if (len <= EXT4_I(inode)->i_inline_size)
325 return 0;
326
327 error = ext4_get_inode_loc(inode, &is.iloc);
328 if (error)
329 return error;
330
331 error = ext4_xattr_ibody_find(inode, &i, &is);
332 if (error)
333 goto out;
334
335 BUG_ON(is.s.not_found);
336
337 len -= EXT4_MIN_INLINE_DATA_SIZE;
338 value = kzalloc(len, GFP_NOFS);
339 if (!value)
340 goto out;
341
342 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
343 value, len);
344 if (error == -ENODATA)
345 goto out;
346
347 BUFFER_TRACE(is.iloc.bh, "get_write_access");
348 error = ext4_journal_get_write_access(handle, is.iloc.bh);
349 if (error)
350 goto out;
351
352 /* Update the xttr entry. */
353 i.value = value;
354 i.value_len = len;
355
356 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
357 if (error)
358 goto out;
359
360 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
361 (void *)ext4_raw_inode(&is.iloc));
362 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
363 le32_to_cpu(is.s.here->e_value_size);
364 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
365 get_bh(is.iloc.bh);
366 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
367
368out:
369 kfree(value);
370 brelse(is.iloc.bh);
371 return error;
372}
373
374static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
375 unsigned int len)
376{
377 int ret, size;
378 struct ext4_inode_info *ei = EXT4_I(inode);
379
380 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
381 return -ENOSPC;
382
383 size = ext4_get_max_inline_size(inode);
384 if (size < len)
385 return -ENOSPC;
386
387 down_write(&EXT4_I(inode)->xattr_sem);
388
389 if (ei->i_inline_off)
390 ret = ext4_update_inline_data(handle, inode, len);
391 else
392 ret = ext4_create_inline_data(handle, inode, len);
393
394 up_write(&EXT4_I(inode)->xattr_sem);
395
396 return ret;
397}
398
399static int ext4_destroy_inline_data_nolock(handle_t *handle,
400 struct inode *inode)
401{
402 struct ext4_inode_info *ei = EXT4_I(inode);
403 struct ext4_xattr_ibody_find is = {
404 .s = { .not_found = 0, },
405 };
406 struct ext4_xattr_info i = {
407 .name_index = EXT4_XATTR_INDEX_SYSTEM,
408 .name = EXT4_XATTR_SYSTEM_DATA,
409 .value = NULL,
410 .value_len = 0,
411 };
412 int error;
413
414 if (!ei->i_inline_off)
415 return 0;
416
417 error = ext4_get_inode_loc(inode, &is.iloc);
418 if (error)
419 return error;
420
421 error = ext4_xattr_ibody_find(inode, &i, &is);
422 if (error)
423 goto out;
424
425 BUFFER_TRACE(is.iloc.bh, "get_write_access");
426 error = ext4_journal_get_write_access(handle, is.iloc.bh);
427 if (error)
428 goto out;
429
430 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
431 if (error)
432 goto out;
433
434 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
435 0, EXT4_MIN_INLINE_DATA_SIZE);
436
437 if (ext4_has_feature_extents(inode->i_sb)) {
438 if (S_ISDIR(inode->i_mode) ||
439 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
440 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
441 ext4_ext_tree_init(handle, inode);
442 }
443 }
444 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
445
446 get_bh(is.iloc.bh);
447 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
448
449 EXT4_I(inode)->i_inline_off = 0;
450 EXT4_I(inode)->i_inline_size = 0;
451 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
452out:
453 brelse(is.iloc.bh);
454 if (error == -ENODATA)
455 error = 0;
456 return error;
457}
458
459static int ext4_read_inline_page(struct inode *inode, struct page *page)
460{
461 void *kaddr;
462 int ret = 0;
463 size_t len;
464 struct ext4_iloc iloc;
465
466 BUG_ON(!PageLocked(page));
467 BUG_ON(!ext4_has_inline_data(inode));
468 BUG_ON(page->index);
469
470 if (!EXT4_I(inode)->i_inline_off) {
471 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
472 inode->i_ino);
473 goto out;
474 }
475
476 ret = ext4_get_inode_loc(inode, &iloc);
477 if (ret)
478 goto out;
479
480 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
481 kaddr = kmap_atomic(page);
482 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
483 flush_dcache_page(page);
484 kunmap_atomic(kaddr);
485 zero_user_segment(page, len, PAGE_SIZE);
486 SetPageUptodate(page);
487 brelse(iloc.bh);
488
489out:
490 return ret;
491}
492
493int ext4_readpage_inline(struct inode *inode, struct page *page)
494{
495 int ret = 0;
496
497 down_read(&EXT4_I(inode)->xattr_sem);
498 if (!ext4_has_inline_data(inode)) {
499 up_read(&EXT4_I(inode)->xattr_sem);
500 return -EAGAIN;
501 }
502
503 /*
504 * Current inline data can only exist in the 1st page,
505 * So for all the other pages, just set them uptodate.
506 */
507 if (!page->index)
508 ret = ext4_read_inline_page(inode, page);
509 else if (!PageUptodate(page)) {
510 zero_user_segment(page, 0, PAGE_SIZE);
511 SetPageUptodate(page);
512 }
513
514 up_read(&EXT4_I(inode)->xattr_sem);
515
516 unlock_page(page);
517 return ret >= 0 ? 0 : ret;
518}
519
520static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
521 struct inode *inode,
522 unsigned flags)
523{
524 int ret, needed_blocks;
525 handle_t *handle = NULL;
526 int retries = 0, sem_held = 0;
527 struct page *page = NULL;
528 unsigned from, to;
529 struct ext4_iloc iloc;
530
531 if (!ext4_has_inline_data(inode)) {
532 /*
533 * clear the flag so that no new write
534 * will trap here again.
535 */
536 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
537 return 0;
538 }
539
540 needed_blocks = ext4_writepage_trans_blocks(inode);
541
542 ret = ext4_get_inode_loc(inode, &iloc);
543 if (ret)
544 return ret;
545
546retry:
547 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
548 if (IS_ERR(handle)) {
549 ret = PTR_ERR(handle);
550 handle = NULL;
551 goto out;
552 }
553
554 /* We cannot recurse into the filesystem as the transaction is already
555 * started */
556 flags |= AOP_FLAG_NOFS;
557
558 page = grab_cache_page_write_begin(mapping, 0, flags);
559 if (!page) {
560 ret = -ENOMEM;
561 goto out;
562 }
563
564 down_write(&EXT4_I(inode)->xattr_sem);
565 sem_held = 1;
566 /* If some one has already done this for us, just exit. */
567 if (!ext4_has_inline_data(inode)) {
568 ret = 0;
569 goto out;
570 }
571
572 from = 0;
573 to = ext4_get_inline_size(inode);
574 if (!PageUptodate(page)) {
575 ret = ext4_read_inline_page(inode, page);
576 if (ret < 0)
577 goto out;
578 }
579
580 ret = ext4_destroy_inline_data_nolock(handle, inode);
581 if (ret)
582 goto out;
583
584 if (ext4_should_dioread_nolock(inode)) {
585 ret = __block_write_begin(page, from, to,
586 ext4_get_block_unwritten);
587 } else
588 ret = __block_write_begin(page, from, to, ext4_get_block);
589
590 if (!ret && ext4_should_journal_data(inode)) {
591 ret = ext4_walk_page_buffers(handle, page_buffers(page),
592 from, to, NULL,
593 do_journal_get_write_access);
594 }
595
596 if (ret) {
597 unlock_page(page);
598 put_page(page);
599 page = NULL;
600 ext4_orphan_add(handle, inode);
601 up_write(&EXT4_I(inode)->xattr_sem);
602 sem_held = 0;
603 ext4_journal_stop(handle);
604 handle = NULL;
605 ext4_truncate_failed_write(inode);
606 /*
607 * If truncate failed early the inode might
608 * still be on the orphan list; we need to
609 * make sure the inode is removed from the
610 * orphan list in that case.
611 */
612 if (inode->i_nlink)
613 ext4_orphan_del(NULL, inode);
614 }
615
616 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
617 goto retry;
618
619 if (page)
620 block_commit_write(page, from, to);
621out:
622 if (page) {
623 unlock_page(page);
624 put_page(page);
625 }
626 if (sem_held)
627 up_write(&EXT4_I(inode)->xattr_sem);
628 if (handle)
629 ext4_journal_stop(handle);
630 brelse(iloc.bh);
631 return ret;
632}
633
634/*
635 * Try to write data in the inode.
636 * If the inode has inline data, check whether the new write can be
637 * in the inode also. If not, create the page the handle, move the data
638 * to the page make it update and let the later codes create extent for it.
639 */
640int ext4_try_to_write_inline_data(struct address_space *mapping,
641 struct inode *inode,
642 loff_t pos, unsigned len,
643 unsigned flags,
644 struct page **pagep)
645{
646 int ret;
647 handle_t *handle;
648 struct page *page;
649 struct ext4_iloc iloc;
650
651 if (pos + len > ext4_get_max_inline_size(inode))
652 goto convert;
653
654 ret = ext4_get_inode_loc(inode, &iloc);
655 if (ret)
656 return ret;
657
658 /*
659 * The possible write could happen in the inode,
660 * so try to reserve the space in inode first.
661 */
662 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
663 if (IS_ERR(handle)) {
664 ret = PTR_ERR(handle);
665 handle = NULL;
666 goto out;
667 }
668
669 ret = ext4_prepare_inline_data(handle, inode, pos + len);
670 if (ret && ret != -ENOSPC)
671 goto out;
672
673 /* We don't have space in inline inode, so convert it to extent. */
674 if (ret == -ENOSPC) {
675 ext4_journal_stop(handle);
676 brelse(iloc.bh);
677 goto convert;
678 }
679
680 flags |= AOP_FLAG_NOFS;
681
682 page = grab_cache_page_write_begin(mapping, 0, flags);
683 if (!page) {
684 ret = -ENOMEM;
685 goto out;
686 }
687
688 *pagep = page;
689 down_read(&EXT4_I(inode)->xattr_sem);
690 if (!ext4_has_inline_data(inode)) {
691 ret = 0;
692 unlock_page(page);
693 put_page(page);
694 goto out_up_read;
695 }
696
697 if (!PageUptodate(page)) {
698 ret = ext4_read_inline_page(inode, page);
699 if (ret < 0)
700 goto out_up_read;
701 }
702
703 ret = 1;
704 handle = NULL;
705out_up_read:
706 up_read(&EXT4_I(inode)->xattr_sem);
707out:
708 if (handle)
709 ext4_journal_stop(handle);
710 brelse(iloc.bh);
711 return ret;
712convert:
713 return ext4_convert_inline_data_to_extent(mapping,
714 inode, flags);
715}
716
717int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
718 unsigned copied, struct page *page)
719{
720 int ret;
721 void *kaddr;
722 struct ext4_iloc iloc;
723
724 if (unlikely(copied < len)) {
725 if (!PageUptodate(page)) {
726 copied = 0;
727 goto out;
728 }
729 }
730
731 ret = ext4_get_inode_loc(inode, &iloc);
732 if (ret) {
733 ext4_std_error(inode->i_sb, ret);
734 copied = 0;
735 goto out;
736 }
737
738 down_write(&EXT4_I(inode)->xattr_sem);
739 BUG_ON(!ext4_has_inline_data(inode));
740
741 kaddr = kmap_atomic(page);
742 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
743 kunmap_atomic(kaddr);
744 SetPageUptodate(page);
745 /* clear page dirty so that writepages wouldn't work for us. */
746 ClearPageDirty(page);
747
748 up_write(&EXT4_I(inode)->xattr_sem);
749 brelse(iloc.bh);
750out:
751 return copied;
752}
753
754struct buffer_head *
755ext4_journalled_write_inline_data(struct inode *inode,
756 unsigned len,
757 struct page *page)
758{
759 int ret;
760 void *kaddr;
761 struct ext4_iloc iloc;
762
763 ret = ext4_get_inode_loc(inode, &iloc);
764 if (ret) {
765 ext4_std_error(inode->i_sb, ret);
766 return NULL;
767 }
768
769 down_write(&EXT4_I(inode)->xattr_sem);
770 kaddr = kmap_atomic(page);
771 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
772 kunmap_atomic(kaddr);
773 up_write(&EXT4_I(inode)->xattr_sem);
774
775 return iloc.bh;
776}
777
778/*
779 * Try to make the page cache and handle ready for the inline data case.
780 * We can call this function in 2 cases:
781 * 1. The inode is created and the first write exceeds inline size. We can
782 * clear the inode state safely.
783 * 2. The inode has inline data, then we need to read the data, make it
784 * update and dirty so that ext4_da_writepages can handle it. We don't
785 * need to start the journal since the file's metatdata isn't changed now.
786 */
787static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
788 struct inode *inode,
789 unsigned flags,
790 void **fsdata)
791{
792 int ret = 0, inline_size;
793 struct page *page;
794
795 page = grab_cache_page_write_begin(mapping, 0, flags);
796 if (!page)
797 return -ENOMEM;
798
799 down_read(&EXT4_I(inode)->xattr_sem);
800 if (!ext4_has_inline_data(inode)) {
801 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
802 goto out;
803 }
804
805 inline_size = ext4_get_inline_size(inode);
806
807 if (!PageUptodate(page)) {
808 ret = ext4_read_inline_page(inode, page);
809 if (ret < 0)
810 goto out;
811 }
812
813 ret = __block_write_begin(page, 0, inline_size,
814 ext4_da_get_block_prep);
815 if (ret) {
816 up_read(&EXT4_I(inode)->xattr_sem);
817 unlock_page(page);
818 put_page(page);
819 ext4_truncate_failed_write(inode);
820 return ret;
821 }
822
823 SetPageDirty(page);
824 SetPageUptodate(page);
825 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
826 *fsdata = (void *)CONVERT_INLINE_DATA;
827
828out:
829 up_read(&EXT4_I(inode)->xattr_sem);
830 if (page) {
831 unlock_page(page);
832 put_page(page);
833 }
834 return ret;
835}
836
837/*
838 * Prepare the write for the inline data.
839 * If the the data can be written into the inode, we just read
840 * the page and make it uptodate, and start the journal.
841 * Otherwise read the page, makes it dirty so that it can be
842 * handle in writepages(the i_disksize update is left to the
843 * normal ext4_da_write_end).
844 */
845int ext4_da_write_inline_data_begin(struct address_space *mapping,
846 struct inode *inode,
847 loff_t pos, unsigned len,
848 unsigned flags,
849 struct page **pagep,
850 void **fsdata)
851{
852 int ret, inline_size;
853 handle_t *handle;
854 struct page *page;
855 struct ext4_iloc iloc;
856 int retries;
857
858 ret = ext4_get_inode_loc(inode, &iloc);
859 if (ret)
860 return ret;
861
862retry_journal:
863 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
864 if (IS_ERR(handle)) {
865 ret = PTR_ERR(handle);
866 goto out;
867 }
868
869 inline_size = ext4_get_max_inline_size(inode);
870
871 ret = -ENOSPC;
872 if (inline_size >= pos + len) {
873 ret = ext4_prepare_inline_data(handle, inode, pos + len);
874 if (ret && ret != -ENOSPC)
875 goto out_journal;
876 }
877
878 /*
879 * We cannot recurse into the filesystem as the transaction
880 * is already started.
881 */
882 flags |= AOP_FLAG_NOFS;
883
884 if (ret == -ENOSPC) {
885 ret = ext4_da_convert_inline_data_to_extent(mapping,
886 inode,
887 flags,
888 fsdata);
889 ext4_journal_stop(handle);
890 if (ret == -ENOSPC &&
891 ext4_should_retry_alloc(inode->i_sb, &retries))
892 goto retry_journal;
893 goto out;
894 }
895
896
897 page = grab_cache_page_write_begin(mapping, 0, flags);
898 if (!page) {
899 ret = -ENOMEM;
900 goto out_journal;
901 }
902
903 down_read(&EXT4_I(inode)->xattr_sem);
904 if (!ext4_has_inline_data(inode)) {
905 ret = 0;
906 goto out_release_page;
907 }
908
909 if (!PageUptodate(page)) {
910 ret = ext4_read_inline_page(inode, page);
911 if (ret < 0)
912 goto out_release_page;
913 }
914
915 up_read(&EXT4_I(inode)->xattr_sem);
916 *pagep = page;
917 brelse(iloc.bh);
918 return 1;
919out_release_page:
920 up_read(&EXT4_I(inode)->xattr_sem);
921 unlock_page(page);
922 put_page(page);
923out_journal:
924 ext4_journal_stop(handle);
925out:
926 brelse(iloc.bh);
927 return ret;
928}
929
930int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
931 unsigned len, unsigned copied,
932 struct page *page)
933{
934 int i_size_changed = 0;
935
936 copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
937
938 /*
939 * No need to use i_size_read() here, the i_size
940 * cannot change under us because we hold i_mutex.
941 *
942 * But it's important to update i_size while still holding page lock:
943 * page writeout could otherwise come in and zero beyond i_size.
944 */
945 if (pos+copied > inode->i_size) {
946 i_size_write(inode, pos+copied);
947 i_size_changed = 1;
948 }
949 unlock_page(page);
950 put_page(page);
951
952 /*
953 * Don't mark the inode dirty under page lock. First, it unnecessarily
954 * makes the holding time of page lock longer. Second, it forces lock
955 * ordering of page lock and transaction start for journaling
956 * filesystems.
957 */
958 if (i_size_changed)
959 mark_inode_dirty(inode);
960
961 return copied;
962}
963
964#ifdef INLINE_DIR_DEBUG
965void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
966 void *inline_start, int inline_size)
967{
968 int offset;
969 unsigned short de_len;
970 struct ext4_dir_entry_2 *de = inline_start;
971 void *dlimit = inline_start + inline_size;
972
973 trace_printk("inode %lu\n", dir->i_ino);
974 offset = 0;
975 while ((void *)de < dlimit) {
976 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
977 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
978 offset, de_len, de->name_len, de->name,
979 de->name_len, le32_to_cpu(de->inode));
980 if (ext4_check_dir_entry(dir, NULL, de, bh,
981 inline_start, inline_size, offset))
982 BUG();
983
984 offset += de_len;
985 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
986 }
987}
988#else
989#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
990#endif
991
992/*
993 * Add a new entry into a inline dir.
994 * It will return -ENOSPC if no space is available, and -EIO
995 * and -EEXIST if directory entry already exists.
996 */
997static int ext4_add_dirent_to_inline(handle_t *handle,
998 struct ext4_filename *fname,
999 struct inode *dir,
1000 struct inode *inode,
1001 struct ext4_iloc *iloc,
1002 void *inline_start, int inline_size)
1003{
1004 int err;
1005 struct ext4_dir_entry_2 *de;
1006
1007 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1008 inline_size, fname, &de);
1009 if (err)
1010 return err;
1011
1012 BUFFER_TRACE(iloc->bh, "get_write_access");
1013 err = ext4_journal_get_write_access(handle, iloc->bh);
1014 if (err)
1015 return err;
1016 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1017
1018 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1019
1020 /*
1021 * XXX shouldn't update any times until successful
1022 * completion of syscall, but too many callers depend
1023 * on this.
1024 *
1025 * XXX similarly, too many callers depend on
1026 * ext4_new_inode() setting the times, but error
1027 * recovery deletes the inode, so the worst that can
1028 * happen is that the times are slightly out of date
1029 * and/or different from the directory change time.
1030 */
1031 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1032 ext4_update_dx_flag(dir);
1033 dir->i_version++;
1034 ext4_mark_inode_dirty(handle, dir);
1035 return 1;
1036}
1037
1038static void *ext4_get_inline_xattr_pos(struct inode *inode,
1039 struct ext4_iloc *iloc)
1040{
1041 struct ext4_xattr_entry *entry;
1042 struct ext4_xattr_ibody_header *header;
1043
1044 BUG_ON(!EXT4_I(inode)->i_inline_off);
1045
1046 header = IHDR(inode, ext4_raw_inode(iloc));
1047 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1048 EXT4_I(inode)->i_inline_off);
1049
1050 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1051}
1052
1053/* Set the final de to cover the whole block. */
1054static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1055{
1056 struct ext4_dir_entry_2 *de, *prev_de;
1057 void *limit;
1058 int de_len;
1059
1060 de = (struct ext4_dir_entry_2 *)de_buf;
1061 if (old_size) {
1062 limit = de_buf + old_size;
1063 do {
1064 prev_de = de;
1065 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1066 de_buf += de_len;
1067 de = (struct ext4_dir_entry_2 *)de_buf;
1068 } while (de_buf < limit);
1069
1070 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1071 old_size, new_size);
1072 } else {
1073 /* this is just created, so create an empty entry. */
1074 de->inode = 0;
1075 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1076 }
1077}
1078
1079static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1080 struct ext4_iloc *iloc)
1081{
1082 int ret;
1083 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1084 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1085
1086 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1087 return -ENOSPC;
1088
1089 ret = ext4_update_inline_data(handle, dir,
1090 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1091 if (ret)
1092 return ret;
1093
1094 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1095 EXT4_I(dir)->i_inline_size -
1096 EXT4_MIN_INLINE_DATA_SIZE);
1097 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1098 return 0;
1099}
1100
1101static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1102 struct ext4_iloc *iloc,
1103 void *buf, int inline_size)
1104{
1105 ext4_create_inline_data(handle, inode, inline_size);
1106 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1107 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1108}
1109
1110static int ext4_finish_convert_inline_dir(handle_t *handle,
1111 struct inode *inode,
1112 struct buffer_head *dir_block,
1113 void *buf,
1114 int inline_size)
1115{
1116 int err, csum_size = 0, header_size = 0;
1117 struct ext4_dir_entry_2 *de;
1118 struct ext4_dir_entry_tail *t;
1119 void *target = dir_block->b_data;
1120
1121 /*
1122 * First create "." and ".." and then copy the dir information
1123 * back to the block.
1124 */
1125 de = (struct ext4_dir_entry_2 *)target;
1126 de = ext4_init_dot_dotdot(inode, de,
1127 inode->i_sb->s_blocksize, csum_size,
1128 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1129 header_size = (void *)de - target;
1130
1131 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1132 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1133
1134 if (ext4_has_metadata_csum(inode->i_sb))
1135 csum_size = sizeof(struct ext4_dir_entry_tail);
1136
1137 inode->i_size = inode->i_sb->s_blocksize;
1138 i_size_write(inode, inode->i_sb->s_blocksize);
1139 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1140 ext4_update_final_de(dir_block->b_data,
1141 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1142 inode->i_sb->s_blocksize - csum_size);
1143
1144 if (csum_size) {
1145 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1146 inode->i_sb->s_blocksize);
1147 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1148 }
1149 set_buffer_uptodate(dir_block);
1150 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1151 if (err)
1152 goto out;
1153 set_buffer_verified(dir_block);
1154out:
1155 return err;
1156}
1157
1158static int ext4_convert_inline_data_nolock(handle_t *handle,
1159 struct inode *inode,
1160 struct ext4_iloc *iloc)
1161{
1162 int error;
1163 void *buf = NULL;
1164 struct buffer_head *data_bh = NULL;
1165 struct ext4_map_blocks map;
1166 int inline_size;
1167
1168 inline_size = ext4_get_inline_size(inode);
1169 buf = kmalloc(inline_size, GFP_NOFS);
1170 if (!buf) {
1171 error = -ENOMEM;
1172 goto out;
1173 }
1174
1175 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1176 if (error < 0)
1177 goto out;
1178
1179 /*
1180 * Make sure the inline directory entries pass checks before we try to
1181 * convert them, so that we avoid touching stuff that needs fsck.
1182 */
1183 if (S_ISDIR(inode->i_mode)) {
1184 error = ext4_check_all_de(inode, iloc->bh,
1185 buf + EXT4_INLINE_DOTDOT_SIZE,
1186 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1187 if (error)
1188 goto out;
1189 }
1190
1191 error = ext4_destroy_inline_data_nolock(handle, inode);
1192 if (error)
1193 goto out;
1194
1195 map.m_lblk = 0;
1196 map.m_len = 1;
1197 map.m_flags = 0;
1198 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1199 if (error < 0)
1200 goto out_restore;
1201 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1202 error = -EIO;
1203 goto out_restore;
1204 }
1205
1206 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1207 if (!data_bh) {
1208 error = -ENOMEM;
1209 goto out_restore;
1210 }
1211
1212 lock_buffer(data_bh);
1213 error = ext4_journal_get_create_access(handle, data_bh);
1214 if (error) {
1215 unlock_buffer(data_bh);
1216 error = -EIO;
1217 goto out_restore;
1218 }
1219 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1220
1221 if (!S_ISDIR(inode->i_mode)) {
1222 memcpy(data_bh->b_data, buf, inline_size);
1223 set_buffer_uptodate(data_bh);
1224 error = ext4_handle_dirty_metadata(handle,
1225 inode, data_bh);
1226 } else {
1227 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1228 buf, inline_size);
1229 }
1230
1231 unlock_buffer(data_bh);
1232out_restore:
1233 if (error)
1234 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1235
1236out:
1237 brelse(data_bh);
1238 kfree(buf);
1239 return error;
1240}
1241
1242/*
1243 * Try to add the new entry to the inline data.
1244 * If succeeds, return 0. If not, extended the inline dir and copied data to
1245 * the new created block.
1246 */
1247int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1248 struct inode *dir, struct inode *inode)
1249{
1250 int ret, inline_size;
1251 void *inline_start;
1252 struct ext4_iloc iloc;
1253
1254 ret = ext4_get_inode_loc(dir, &iloc);
1255 if (ret)
1256 return ret;
1257
1258 down_write(&EXT4_I(dir)->xattr_sem);
1259 if (!ext4_has_inline_data(dir))
1260 goto out;
1261
1262 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1263 EXT4_INLINE_DOTDOT_SIZE;
1264 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1265
1266 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1267 inline_start, inline_size);
1268 if (ret != -ENOSPC)
1269 goto out;
1270
1271 /* check whether it can be inserted to inline xattr space. */
1272 inline_size = EXT4_I(dir)->i_inline_size -
1273 EXT4_MIN_INLINE_DATA_SIZE;
1274 if (!inline_size) {
1275 /* Try to use the xattr space.*/
1276 ret = ext4_update_inline_dir(handle, dir, &iloc);
1277 if (ret && ret != -ENOSPC)
1278 goto out;
1279
1280 inline_size = EXT4_I(dir)->i_inline_size -
1281 EXT4_MIN_INLINE_DATA_SIZE;
1282 }
1283
1284 if (inline_size) {
1285 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1286
1287 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1288 inode, &iloc, inline_start,
1289 inline_size);
1290
1291 if (ret != -ENOSPC)
1292 goto out;
1293 }
1294
1295 /*
1296 * The inline space is filled up, so create a new block for it.
1297 * As the extent tree will be created, we have to save the inline
1298 * dir first.
1299 */
1300 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1301
1302out:
1303 ext4_mark_inode_dirty(handle, dir);
1304 up_write(&EXT4_I(dir)->xattr_sem);
1305 brelse(iloc.bh);
1306 return ret;
1307}
1308
1309/*
1310 * This function fills a red-black tree with information from an
1311 * inlined dir. It returns the number directory entries loaded
1312 * into the tree. If there is an error it is returned in err.
1313 */
1314int htree_inlinedir_to_tree(struct file *dir_file,
1315 struct inode *dir, ext4_lblk_t block,
1316 struct dx_hash_info *hinfo,
1317 __u32 start_hash, __u32 start_minor_hash,
1318 int *has_inline_data)
1319{
1320 int err = 0, count = 0;
1321 unsigned int parent_ino;
1322 int pos;
1323 struct ext4_dir_entry_2 *de;
1324 struct inode *inode = file_inode(dir_file);
1325 int ret, inline_size = 0;
1326 struct ext4_iloc iloc;
1327 void *dir_buf = NULL;
1328 struct ext4_dir_entry_2 fake;
1329 struct ext4_str tmp_str;
1330
1331 ret = ext4_get_inode_loc(inode, &iloc);
1332 if (ret)
1333 return ret;
1334
1335 down_read(&EXT4_I(inode)->xattr_sem);
1336 if (!ext4_has_inline_data(inode)) {
1337 up_read(&EXT4_I(inode)->xattr_sem);
1338 *has_inline_data = 0;
1339 goto out;
1340 }
1341
1342 inline_size = ext4_get_inline_size(inode);
1343 dir_buf = kmalloc(inline_size, GFP_NOFS);
1344 if (!dir_buf) {
1345 ret = -ENOMEM;
1346 up_read(&EXT4_I(inode)->xattr_sem);
1347 goto out;
1348 }
1349
1350 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1351 up_read(&EXT4_I(inode)->xattr_sem);
1352 if (ret < 0)
1353 goto out;
1354
1355 pos = 0;
1356 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1357 while (pos < inline_size) {
1358 /*
1359 * As inlined dir doesn't store any information about '.' and
1360 * only the inode number of '..' is stored, we have to handle
1361 * them differently.
1362 */
1363 if (pos == 0) {
1364 fake.inode = cpu_to_le32(inode->i_ino);
1365 fake.name_len = 1;
1366 strcpy(fake.name, ".");
1367 fake.rec_len = ext4_rec_len_to_disk(
1368 EXT4_DIR_REC_LEN(fake.name_len),
1369 inline_size);
1370 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1371 de = &fake;
1372 pos = EXT4_INLINE_DOTDOT_OFFSET;
1373 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1374 fake.inode = cpu_to_le32(parent_ino);
1375 fake.name_len = 2;
1376 strcpy(fake.name, "..");
1377 fake.rec_len = ext4_rec_len_to_disk(
1378 EXT4_DIR_REC_LEN(fake.name_len),
1379 inline_size);
1380 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1381 de = &fake;
1382 pos = EXT4_INLINE_DOTDOT_SIZE;
1383 } else {
1384 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1385 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1386 if (ext4_check_dir_entry(inode, dir_file, de,
1387 iloc.bh, dir_buf,
1388 inline_size, pos)) {
1389 ret = count;
1390 goto out;
1391 }
1392 }
1393
1394 ext4fs_dirhash(de->name, de->name_len, hinfo);
1395 if ((hinfo->hash < start_hash) ||
1396 ((hinfo->hash == start_hash) &&
1397 (hinfo->minor_hash < start_minor_hash)))
1398 continue;
1399 if (de->inode == 0)
1400 continue;
1401 tmp_str.name = de->name;
1402 tmp_str.len = de->name_len;
1403 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1404 hinfo->minor_hash, de, &tmp_str);
1405 if (err) {
1406 count = err;
1407 goto out;
1408 }
1409 count++;
1410 }
1411 ret = count;
1412out:
1413 kfree(dir_buf);
1414 brelse(iloc.bh);
1415 return ret;
1416}
1417
1418/*
1419 * So this function is called when the volume is mkfsed with
1420 * dir_index disabled. In order to keep f_pos persistent
1421 * after we convert from an inlined dir to a blocked based,
1422 * we just pretend that we are a normal dir and return the
1423 * offset as if '.' and '..' really take place.
1424 *
1425 */
1426int ext4_read_inline_dir(struct file *file,
1427 struct dir_context *ctx,
1428 int *has_inline_data)
1429{
1430 unsigned int offset, parent_ino;
1431 int i;
1432 struct ext4_dir_entry_2 *de;
1433 struct super_block *sb;
1434 struct inode *inode = file_inode(file);
1435 int ret, inline_size = 0;
1436 struct ext4_iloc iloc;
1437 void *dir_buf = NULL;
1438 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1439
1440 ret = ext4_get_inode_loc(inode, &iloc);
1441 if (ret)
1442 return ret;
1443
1444 down_read(&EXT4_I(inode)->xattr_sem);
1445 if (!ext4_has_inline_data(inode)) {
1446 up_read(&EXT4_I(inode)->xattr_sem);
1447 *has_inline_data = 0;
1448 goto out;
1449 }
1450
1451 inline_size = ext4_get_inline_size(inode);
1452 dir_buf = kmalloc(inline_size, GFP_NOFS);
1453 if (!dir_buf) {
1454 ret = -ENOMEM;
1455 up_read(&EXT4_I(inode)->xattr_sem);
1456 goto out;
1457 }
1458
1459 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1460 up_read(&EXT4_I(inode)->xattr_sem);
1461 if (ret < 0)
1462 goto out;
1463
1464 ret = 0;
1465 sb = inode->i_sb;
1466 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1467 offset = ctx->pos;
1468
1469 /*
1470 * dotdot_offset and dotdot_size is the real offset and
1471 * size for ".." and "." if the dir is block based while
1472 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1473 * So we will use extra_offset and extra_size to indicate them
1474 * during the inline dir iteration.
1475 */
1476 dotdot_offset = EXT4_DIR_REC_LEN(1);
1477 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1478 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1479 extra_size = extra_offset + inline_size;
1480
1481 /*
1482 * If the version has changed since the last call to
1483 * readdir(2), then we might be pointing to an invalid
1484 * dirent right now. Scan from the start of the inline
1485 * dir to make sure.
1486 */
1487 if (file->f_version != inode->i_version) {
1488 for (i = 0; i < extra_size && i < offset;) {
1489 /*
1490 * "." is with offset 0 and
1491 * ".." is dotdot_offset.
1492 */
1493 if (!i) {
1494 i = dotdot_offset;
1495 continue;
1496 } else if (i == dotdot_offset) {
1497 i = dotdot_size;
1498 continue;
1499 }
1500 /* for other entry, the real offset in
1501 * the buf has to be tuned accordingly.
1502 */
1503 de = (struct ext4_dir_entry_2 *)
1504 (dir_buf + i - extra_offset);
1505 /* It's too expensive to do a full
1506 * dirent test each time round this
1507 * loop, but we do have to test at
1508 * least that it is non-zero. A
1509 * failure will be detected in the
1510 * dirent test below. */
1511 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1512 < EXT4_DIR_REC_LEN(1))
1513 break;
1514 i += ext4_rec_len_from_disk(de->rec_len,
1515 extra_size);
1516 }
1517 offset = i;
1518 ctx->pos = offset;
1519 file->f_version = inode->i_version;
1520 }
1521
1522 while (ctx->pos < extra_size) {
1523 if (ctx->pos == 0) {
1524 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1525 goto out;
1526 ctx->pos = dotdot_offset;
1527 continue;
1528 }
1529
1530 if (ctx->pos == dotdot_offset) {
1531 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1532 goto out;
1533 ctx->pos = dotdot_size;
1534 continue;
1535 }
1536
1537 de = (struct ext4_dir_entry_2 *)
1538 (dir_buf + ctx->pos - extra_offset);
1539 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1540 extra_size, ctx->pos))
1541 goto out;
1542 if (le32_to_cpu(de->inode)) {
1543 if (!dir_emit(ctx, de->name, de->name_len,
1544 le32_to_cpu(de->inode),
1545 get_dtype(sb, de->file_type)))
1546 goto out;
1547 }
1548 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1549 }
1550out:
1551 kfree(dir_buf);
1552 brelse(iloc.bh);
1553 return ret;
1554}
1555
1556struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1557 struct ext4_dir_entry_2 **parent_de,
1558 int *retval)
1559{
1560 struct ext4_iloc iloc;
1561
1562 *retval = ext4_get_inode_loc(inode, &iloc);
1563 if (*retval)
1564 return NULL;
1565
1566 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1567
1568 return iloc.bh;
1569}
1570
1571/*
1572 * Try to create the inline data for the new dir.
1573 * If it succeeds, return 0, otherwise return the error.
1574 * In case of ENOSPC, the caller should create the normal disk layout dir.
1575 */
1576int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1577 struct inode *inode)
1578{
1579 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1580 struct ext4_iloc iloc;
1581 struct ext4_dir_entry_2 *de;
1582
1583 ret = ext4_get_inode_loc(inode, &iloc);
1584 if (ret)
1585 return ret;
1586
1587 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1588 if (ret)
1589 goto out;
1590
1591 /*
1592 * For inline dir, we only save the inode information for the ".."
1593 * and create a fake dentry to cover the left space.
1594 */
1595 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1596 de->inode = cpu_to_le32(parent->i_ino);
1597 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1598 de->inode = 0;
1599 de->rec_len = ext4_rec_len_to_disk(
1600 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1601 inline_size);
1602 set_nlink(inode, 2);
1603 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1604out:
1605 brelse(iloc.bh);
1606 return ret;
1607}
1608
1609struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1610 struct ext4_filename *fname,
1611 const struct qstr *d_name,
1612 struct ext4_dir_entry_2 **res_dir,
1613 int *has_inline_data)
1614{
1615 int ret;
1616 struct ext4_iloc iloc;
1617 void *inline_start;
1618 int inline_size;
1619
1620 if (ext4_get_inode_loc(dir, &iloc))
1621 return NULL;
1622
1623 down_read(&EXT4_I(dir)->xattr_sem);
1624 if (!ext4_has_inline_data(dir)) {
1625 *has_inline_data = 0;
1626 goto out;
1627 }
1628
1629 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1630 EXT4_INLINE_DOTDOT_SIZE;
1631 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1632 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1633 dir, fname, d_name, 0, res_dir);
1634 if (ret == 1)
1635 goto out_find;
1636 if (ret < 0)
1637 goto out;
1638
1639 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1640 goto out;
1641
1642 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1643 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1644
1645 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1646 dir, fname, d_name, 0, res_dir);
1647 if (ret == 1)
1648 goto out_find;
1649
1650out:
1651 brelse(iloc.bh);
1652 iloc.bh = NULL;
1653out_find:
1654 up_read(&EXT4_I(dir)->xattr_sem);
1655 return iloc.bh;
1656}
1657
1658int ext4_delete_inline_entry(handle_t *handle,
1659 struct inode *dir,
1660 struct ext4_dir_entry_2 *de_del,
1661 struct buffer_head *bh,
1662 int *has_inline_data)
1663{
1664 int err, inline_size;
1665 struct ext4_iloc iloc;
1666 void *inline_start;
1667
1668 err = ext4_get_inode_loc(dir, &iloc);
1669 if (err)
1670 return err;
1671
1672 down_write(&EXT4_I(dir)->xattr_sem);
1673 if (!ext4_has_inline_data(dir)) {
1674 *has_inline_data = 0;
1675 goto out;
1676 }
1677
1678 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1679 EXT4_MIN_INLINE_DATA_SIZE) {
1680 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1681 EXT4_INLINE_DOTDOT_SIZE;
1682 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1683 EXT4_INLINE_DOTDOT_SIZE;
1684 } else {
1685 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1686 inline_size = ext4_get_inline_size(dir) -
1687 EXT4_MIN_INLINE_DATA_SIZE;
1688 }
1689
1690 BUFFER_TRACE(bh, "get_write_access");
1691 err = ext4_journal_get_write_access(handle, bh);
1692 if (err)
1693 goto out;
1694
1695 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1696 inline_start, inline_size, 0);
1697 if (err)
1698 goto out;
1699
1700 err = ext4_mark_inode_dirty(handle, dir);
1701 if (unlikely(err))
1702 goto out;
1703
1704 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1705out:
1706 up_write(&EXT4_I(dir)->xattr_sem);
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
1742int 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 int ret = 1;
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 1;
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 = 1;
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\n",
1784 dir->i_ino, le32_to_cpu(de->inode),
1785 le16_to_cpu(de->rec_len), de->name_len,
1786 inline_size);
1787 ret = 1;
1788 goto out;
1789 }
1790 if (le32_to_cpu(de->inode)) {
1791 ret = 0;
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;
1806
1807 down_write(&EXT4_I(inode)->xattr_sem);
1808 ret = ext4_destroy_inline_data_nolock(handle, inode);
1809 up_write(&EXT4_I(inode)->xattr_sem);
1810
1811 return ret;
1812}
1813
1814int ext4_inline_data_fiemap(struct inode *inode,
1815 struct fiemap_extent_info *fieinfo,
1816 int *has_inline, __u64 start, __u64 len)
1817{
1818 __u64 physical = 0;
1819 __u64 inline_len;
1820 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1821 FIEMAP_EXTENT_LAST;
1822 int error = 0;
1823 struct ext4_iloc iloc;
1824
1825 down_read(&EXT4_I(inode)->xattr_sem);
1826 if (!ext4_has_inline_data(inode)) {
1827 *has_inline = 0;
1828 goto out;
1829 }
1830 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1831 i_size_read(inode));
1832 if (start >= inline_len)
1833 goto out;
1834 if (start + len < inline_len)
1835 inline_len = start + len;
1836 inline_len -= start;
1837
1838 error = ext4_get_inode_loc(inode, &iloc);
1839 if (error)
1840 goto out;
1841
1842 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1843 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1844 physical += offsetof(struct ext4_inode, i_block);
1845
1846 if (physical)
1847 error = fiemap_fill_next_extent(fieinfo, start, physical,
1848 inline_len, flags);
1849 brelse(iloc.bh);
1850out:
1851 up_read(&EXT4_I(inode)->xattr_sem);
1852 return (error < 0 ? error : 0);
1853}
1854
1855/*
1856 * Called during xattr set, and if we can sparse space 'needed',
1857 * just create the extent tree evict the data to the outer block.
1858 *
1859 * We use jbd2 instead of page cache to move data to the 1st block
1860 * so that the whole transaction can be committed as a whole and
1861 * the data isn't lost because of the delayed page cache write.
1862 */
1863int ext4_try_to_evict_inline_data(handle_t *handle,
1864 struct inode *inode,
1865 int needed)
1866{
1867 int error;
1868 struct ext4_xattr_entry *entry;
1869 struct ext4_inode *raw_inode;
1870 struct ext4_iloc iloc;
1871
1872 error = ext4_get_inode_loc(inode, &iloc);
1873 if (error)
1874 return error;
1875
1876 raw_inode = ext4_raw_inode(&iloc);
1877 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1878 EXT4_I(inode)->i_inline_off);
1879 if (EXT4_XATTR_LEN(entry->e_name_len) +
1880 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1881 error = -ENOSPC;
1882 goto out;
1883 }
1884
1885 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1886out:
1887 brelse(iloc.bh);
1888 return error;
1889}
1890
1891void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1892{
1893 handle_t *handle;
1894 int inline_size, value_len, needed_blocks;
1895 size_t i_size;
1896 void *value = NULL;
1897 struct ext4_xattr_ibody_find is = {
1898 .s = { .not_found = -ENODATA, },
1899 };
1900 struct ext4_xattr_info i = {
1901 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1902 .name = EXT4_XATTR_SYSTEM_DATA,
1903 };
1904
1905
1906 needed_blocks = ext4_writepage_trans_blocks(inode);
1907 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1908 if (IS_ERR(handle))
1909 return;
1910
1911 down_write(&EXT4_I(inode)->xattr_sem);
1912 if (!ext4_has_inline_data(inode)) {
1913 *has_inline = 0;
1914 ext4_journal_stop(handle);
1915 return;
1916 }
1917
1918 if (ext4_orphan_add(handle, inode))
1919 goto out;
1920
1921 if (ext4_get_inode_loc(inode, &is.iloc))
1922 goto out;
1923
1924 down_write(&EXT4_I(inode)->i_data_sem);
1925 i_size = inode->i_size;
1926 inline_size = ext4_get_inline_size(inode);
1927 EXT4_I(inode)->i_disksize = i_size;
1928
1929 if (i_size < inline_size) {
1930 /* Clear the content in the xattr space. */
1931 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1932 if (ext4_xattr_ibody_find(inode, &i, &is))
1933 goto out_error;
1934
1935 BUG_ON(is.s.not_found);
1936
1937 value_len = le32_to_cpu(is.s.here->e_value_size);
1938 value = kmalloc(value_len, GFP_NOFS);
1939 if (!value)
1940 goto out_error;
1941
1942 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1943 value, value_len))
1944 goto out_error;
1945
1946 i.value = value;
1947 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1948 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1949 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1950 goto out_error;
1951 }
1952
1953 /* Clear the content within i_blocks. */
1954 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1955 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1956 memset(p + i_size, 0,
1957 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1958 }
1959
1960 EXT4_I(inode)->i_inline_size = i_size <
1961 EXT4_MIN_INLINE_DATA_SIZE ?
1962 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1963 }
1964
1965out_error:
1966 up_write(&EXT4_I(inode)->i_data_sem);
1967out:
1968 brelse(is.iloc.bh);
1969 up_write(&EXT4_I(inode)->xattr_sem);
1970 kfree(value);
1971 if (inode->i_nlink)
1972 ext4_orphan_del(handle, inode);
1973
1974 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1975 ext4_mark_inode_dirty(handle, inode);
1976 if (IS_SYNC(inode))
1977 ext4_handle_sync(handle);
1978
1979 ext4_journal_stop(handle);
1980 return;
1981}
1982
1983int ext4_convert_inline_data(struct inode *inode)
1984{
1985 int error, needed_blocks;
1986 handle_t *handle;
1987 struct ext4_iloc iloc;
1988
1989 if (!ext4_has_inline_data(inode)) {
1990 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1991 return 0;
1992 }
1993
1994 needed_blocks = ext4_writepage_trans_blocks(inode);
1995
1996 iloc.bh = NULL;
1997 error = ext4_get_inode_loc(inode, &iloc);
1998 if (error)
1999 return error;
2000
2001 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2002 if (IS_ERR(handle)) {
2003 error = PTR_ERR(handle);
2004 goto out_free;
2005 }
2006
2007 down_write(&EXT4_I(inode)->xattr_sem);
2008 if (!ext4_has_inline_data(inode)) {
2009 up_write(&EXT4_I(inode)->xattr_sem);
2010 goto out;
2011 }
2012
2013 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2014 up_write(&EXT4_I(inode)->xattr_sem);
2015out:
2016 ext4_journal_stop(handle);
2017out_free:
2018 brelse(iloc.bh);
2019 return error;
2020}
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#include "ext4_jbd2.h"
15#include "ext4.h"
16#include "xattr.h"
17#include "truncate.h"
18#include <linux/fiemap.h>
19
20#define EXT4_XATTR_SYSTEM_DATA "data"
21#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
22#define EXT4_INLINE_DOTDOT_OFFSET 2
23#define EXT4_INLINE_DOTDOT_SIZE 4
24
25int ext4_get_inline_size(struct inode *inode)
26{
27 if (EXT4_I(inode)->i_inline_off)
28 return EXT4_I(inode)->i_inline_size;
29
30 return 0;
31}
32
33static int get_max_inline_xattr_value_size(struct inode *inode,
34 struct ext4_iloc *iloc)
35{
36 struct ext4_xattr_ibody_header *header;
37 struct ext4_xattr_entry *entry;
38 struct ext4_inode *raw_inode;
39 int free, min_offs;
40
41 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
42 EXT4_GOOD_OLD_INODE_SIZE -
43 EXT4_I(inode)->i_extra_isize -
44 sizeof(struct ext4_xattr_ibody_header);
45
46 /*
47 * We need to subtract another sizeof(__u32) since an in-inode xattr
48 * needs an empty 4 bytes to indicate the gap between the xattr entry
49 * and the name/value pair.
50 */
51 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
52 return EXT4_XATTR_SIZE(min_offs -
53 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
54 EXT4_XATTR_ROUND - sizeof(__u32));
55
56 raw_inode = ext4_raw_inode(iloc);
57 header = IHDR(inode, raw_inode);
58 entry = IFIRST(header);
59
60 /* Compute min_offs. */
61 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
62 if (!entry->e_value_block && entry->e_value_size) {
63 size_t offs = le16_to_cpu(entry->e_value_offs);
64 if (offs < min_offs)
65 min_offs = offs;
66 }
67 }
68 free = min_offs -
69 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
70
71 if (EXT4_I(inode)->i_inline_off) {
72 entry = (struct ext4_xattr_entry *)
73 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
74
75 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
76 goto out;
77 }
78
79 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
80
81 if (free > EXT4_XATTR_ROUND)
82 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
83 else
84 free = 0;
85
86out:
87 return free;
88}
89
90/*
91 * Get the maximum size we now can store in an inode.
92 * If we can't find the space for a xattr entry, don't use the space
93 * of the extents since we have no space to indicate the inline data.
94 */
95int ext4_get_max_inline_size(struct inode *inode)
96{
97 int error, max_inline_size;
98 struct ext4_iloc iloc;
99
100 if (EXT4_I(inode)->i_extra_isize == 0)
101 return 0;
102
103 error = ext4_get_inode_loc(inode, &iloc);
104 if (error) {
105 ext4_error_inode(inode, __func__, __LINE__, 0,
106 "can't get inode location %lu",
107 inode->i_ino);
108 return 0;
109 }
110
111 down_read(&EXT4_I(inode)->xattr_sem);
112 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
113 up_read(&EXT4_I(inode)->xattr_sem);
114
115 brelse(iloc.bh);
116
117 if (!max_inline_size)
118 return 0;
119
120 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
121}
122
123int ext4_has_inline_data(struct inode *inode)
124{
125 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
126 EXT4_I(inode)->i_inline_off;
127}
128
129/*
130 * this function does not take xattr_sem, which is OK because it is
131 * currently only used in a code path coming form ext4_iget, before
132 * the new inode has been unlocked
133 */
134int ext4_find_inline_data_nolock(struct inode *inode)
135{
136 struct ext4_xattr_ibody_find is = {
137 .s = { .not_found = -ENODATA, },
138 };
139 struct ext4_xattr_info i = {
140 .name_index = EXT4_XATTR_INDEX_SYSTEM,
141 .name = EXT4_XATTR_SYSTEM_DATA,
142 };
143 int error;
144
145 if (EXT4_I(inode)->i_extra_isize == 0)
146 return 0;
147
148 error = ext4_get_inode_loc(inode, &is.iloc);
149 if (error)
150 return error;
151
152 error = ext4_xattr_ibody_find(inode, &i, &is);
153 if (error)
154 goto out;
155
156 if (!is.s.not_found) {
157 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
158 (void *)ext4_raw_inode(&is.iloc));
159 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
160 le32_to_cpu(is.s.here->e_value_size);
161 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
162 }
163out:
164 brelse(is.iloc.bh);
165 return error;
166}
167
168static int ext4_read_inline_data(struct inode *inode, void *buffer,
169 unsigned int len,
170 struct ext4_iloc *iloc)
171{
172 struct ext4_xattr_entry *entry;
173 struct ext4_xattr_ibody_header *header;
174 int cp_len = 0;
175 struct ext4_inode *raw_inode;
176
177 if (!len)
178 return 0;
179
180 BUG_ON(len > EXT4_I(inode)->i_inline_size);
181
182 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
183 len : EXT4_MIN_INLINE_DATA_SIZE;
184
185 raw_inode = ext4_raw_inode(iloc);
186 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
187
188 len -= cp_len;
189 buffer += cp_len;
190
191 if (!len)
192 goto out;
193
194 header = IHDR(inode, raw_inode);
195 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
196 EXT4_I(inode)->i_inline_off);
197 len = min_t(unsigned int, len,
198 (unsigned int)le32_to_cpu(entry->e_value_size));
199
200 memcpy(buffer,
201 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
202 cp_len += len;
203
204out:
205 return cp_len;
206}
207
208/*
209 * write the buffer to the inline inode.
210 * If 'create' is set, we don't need to do the extra copy in the xattr
211 * value since it is already handled by ext4_xattr_ibody_inline_set.
212 * That saves us one memcpy.
213 */
214void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
215 void *buffer, loff_t pos, unsigned int len)
216{
217 struct ext4_xattr_entry *entry;
218 struct ext4_xattr_ibody_header *header;
219 struct ext4_inode *raw_inode;
220 int cp_len = 0;
221
222 BUG_ON(!EXT4_I(inode)->i_inline_off);
223 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
224
225 raw_inode = ext4_raw_inode(iloc);
226 buffer += pos;
227
228 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
229 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
230 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
231 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
232
233 len -= cp_len;
234 buffer += cp_len;
235 pos += cp_len;
236 }
237
238 if (!len)
239 return;
240
241 pos -= EXT4_MIN_INLINE_DATA_SIZE;
242 header = IHDR(inode, raw_inode);
243 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
244 EXT4_I(inode)->i_inline_off);
245
246 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
247 buffer, len);
248}
249
250static int ext4_create_inline_data(handle_t *handle,
251 struct inode *inode, unsigned len)
252{
253 int error;
254 void *value = NULL;
255 struct ext4_xattr_ibody_find is = {
256 .s = { .not_found = -ENODATA, },
257 };
258 struct ext4_xattr_info i = {
259 .name_index = EXT4_XATTR_INDEX_SYSTEM,
260 .name = EXT4_XATTR_SYSTEM_DATA,
261 };
262
263 error = ext4_get_inode_loc(inode, &is.iloc);
264 if (error)
265 return error;
266
267 error = ext4_journal_get_write_access(handle, is.iloc.bh);
268 if (error)
269 goto out;
270
271 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
272 value = EXT4_ZERO_XATTR_VALUE;
273 len -= EXT4_MIN_INLINE_DATA_SIZE;
274 } else {
275 value = "";
276 len = 0;
277 }
278
279 /* Insert the the xttr entry. */
280 i.value = value;
281 i.value_len = len;
282
283 error = ext4_xattr_ibody_find(inode, &i, &is);
284 if (error)
285 goto out;
286
287 BUG_ON(!is.s.not_found);
288
289 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
290 if (error) {
291 if (error == -ENOSPC)
292 ext4_clear_inode_state(inode,
293 EXT4_STATE_MAY_INLINE_DATA);
294 goto out;
295 }
296
297 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
298 0, EXT4_MIN_INLINE_DATA_SIZE);
299
300 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
301 (void *)ext4_raw_inode(&is.iloc));
302 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
303 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
304 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
305 get_bh(is.iloc.bh);
306 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
307
308out:
309 brelse(is.iloc.bh);
310 return error;
311}
312
313static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
314 unsigned int len)
315{
316 int error;
317 void *value = NULL;
318 struct ext4_xattr_ibody_find is = {
319 .s = { .not_found = -ENODATA, },
320 };
321 struct ext4_xattr_info i = {
322 .name_index = EXT4_XATTR_INDEX_SYSTEM,
323 .name = EXT4_XATTR_SYSTEM_DATA,
324 };
325
326 /* If the old space is ok, write the data directly. */
327 if (len <= EXT4_I(inode)->i_inline_size)
328 return 0;
329
330 error = ext4_get_inode_loc(inode, &is.iloc);
331 if (error)
332 return error;
333
334 error = ext4_xattr_ibody_find(inode, &i, &is);
335 if (error)
336 goto out;
337
338 BUG_ON(is.s.not_found);
339
340 len -= EXT4_MIN_INLINE_DATA_SIZE;
341 value = kzalloc(len, GFP_NOFS);
342 if (!value)
343 goto out;
344
345 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
346 value, len);
347 if (error == -ENODATA)
348 goto out;
349
350 error = ext4_journal_get_write_access(handle, is.iloc.bh);
351 if (error)
352 goto out;
353
354 /* Update the xttr entry. */
355 i.value = value;
356 i.value_len = len;
357
358 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
359 if (error)
360 goto out;
361
362 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
363 (void *)ext4_raw_inode(&is.iloc));
364 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
365 le32_to_cpu(is.s.here->e_value_size);
366 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
367 get_bh(is.iloc.bh);
368 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
369
370out:
371 kfree(value);
372 brelse(is.iloc.bh);
373 return error;
374}
375
376int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
377 unsigned int len)
378{
379 int ret, size;
380 struct ext4_inode_info *ei = EXT4_I(inode);
381
382 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
383 return -ENOSPC;
384
385 size = ext4_get_max_inline_size(inode);
386 if (size < len)
387 return -ENOSPC;
388
389 down_write(&EXT4_I(inode)->xattr_sem);
390
391 if (ei->i_inline_off)
392 ret = ext4_update_inline_data(handle, inode, len);
393 else
394 ret = ext4_create_inline_data(handle, inode, len);
395
396 up_write(&EXT4_I(inode)->xattr_sem);
397
398 return ret;
399}
400
401static int ext4_destroy_inline_data_nolock(handle_t *handle,
402 struct inode *inode)
403{
404 struct ext4_inode_info *ei = EXT4_I(inode);
405 struct ext4_xattr_ibody_find is = {
406 .s = { .not_found = 0, },
407 };
408 struct ext4_xattr_info i = {
409 .name_index = EXT4_XATTR_INDEX_SYSTEM,
410 .name = EXT4_XATTR_SYSTEM_DATA,
411 .value = NULL,
412 .value_len = 0,
413 };
414 int error;
415
416 if (!ei->i_inline_off)
417 return 0;
418
419 error = ext4_get_inode_loc(inode, &is.iloc);
420 if (error)
421 return error;
422
423 error = ext4_xattr_ibody_find(inode, &i, &is);
424 if (error)
425 goto out;
426
427 error = ext4_journal_get_write_access(handle, is.iloc.bh);
428 if (error)
429 goto out;
430
431 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
432 if (error)
433 goto out;
434
435 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
436 0, EXT4_MIN_INLINE_DATA_SIZE);
437
438 if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
439 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
440 if (S_ISDIR(inode->i_mode) ||
441 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
442 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
443 ext4_ext_tree_init(handle, inode);
444 }
445 }
446 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
447
448 get_bh(is.iloc.bh);
449 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
450
451 EXT4_I(inode)->i_inline_off = 0;
452 EXT4_I(inode)->i_inline_size = 0;
453 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
454out:
455 brelse(is.iloc.bh);
456 if (error == -ENODATA)
457 error = 0;
458 return error;
459}
460
461static int ext4_read_inline_page(struct inode *inode, struct page *page)
462{
463 void *kaddr;
464 int ret = 0;
465 size_t len;
466 struct ext4_iloc iloc;
467
468 BUG_ON(!PageLocked(page));
469 BUG_ON(!ext4_has_inline_data(inode));
470 BUG_ON(page->index);
471
472 if (!EXT4_I(inode)->i_inline_off) {
473 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
474 inode->i_ino);
475 goto out;
476 }
477
478 ret = ext4_get_inode_loc(inode, &iloc);
479 if (ret)
480 goto out;
481
482 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
483 kaddr = kmap_atomic(page);
484 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
485 flush_dcache_page(page);
486 kunmap_atomic(kaddr);
487 zero_user_segment(page, len, PAGE_CACHE_SIZE);
488 SetPageUptodate(page);
489 brelse(iloc.bh);
490
491out:
492 return ret;
493}
494
495int ext4_readpage_inline(struct inode *inode, struct page *page)
496{
497 int ret = 0;
498
499 down_read(&EXT4_I(inode)->xattr_sem);
500 if (!ext4_has_inline_data(inode)) {
501 up_read(&EXT4_I(inode)->xattr_sem);
502 return -EAGAIN;
503 }
504
505 /*
506 * Current inline data can only exist in the 1st page,
507 * So for all the other pages, just set them uptodate.
508 */
509 if (!page->index)
510 ret = ext4_read_inline_page(inode, page);
511 else if (!PageUptodate(page)) {
512 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
513 SetPageUptodate(page);
514 }
515
516 up_read(&EXT4_I(inode)->xattr_sem);
517
518 unlock_page(page);
519 return ret >= 0 ? 0 : ret;
520}
521
522static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
523 struct inode *inode,
524 unsigned flags)
525{
526 int ret, needed_blocks;
527 handle_t *handle = NULL;
528 int retries = 0, sem_held = 0;
529 struct page *page = NULL;
530 unsigned from, to;
531 struct ext4_iloc iloc;
532
533 if (!ext4_has_inline_data(inode)) {
534 /*
535 * clear the flag so that no new write
536 * will trap here again.
537 */
538 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
539 return 0;
540 }
541
542 needed_blocks = ext4_writepage_trans_blocks(inode);
543
544 ret = ext4_get_inode_loc(inode, &iloc);
545 if (ret)
546 return ret;
547
548retry:
549 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
550 if (IS_ERR(handle)) {
551 ret = PTR_ERR(handle);
552 handle = NULL;
553 goto out;
554 }
555
556 /* We cannot recurse into the filesystem as the transaction is already
557 * started */
558 flags |= AOP_FLAG_NOFS;
559
560 page = grab_cache_page_write_begin(mapping, 0, flags);
561 if (!page) {
562 ret = -ENOMEM;
563 goto out;
564 }
565
566 down_write(&EXT4_I(inode)->xattr_sem);
567 sem_held = 1;
568 /* If some one has already done this for us, just exit. */
569 if (!ext4_has_inline_data(inode)) {
570 ret = 0;
571 goto out;
572 }
573
574 from = 0;
575 to = ext4_get_inline_size(inode);
576 if (!PageUptodate(page)) {
577 ret = ext4_read_inline_page(inode, page);
578 if (ret < 0)
579 goto out;
580 }
581
582 ret = ext4_destroy_inline_data_nolock(handle, inode);
583 if (ret)
584 goto out;
585
586 if (ext4_should_dioread_nolock(inode))
587 ret = __block_write_begin(page, from, to, ext4_get_block_write);
588 else
589 ret = __block_write_begin(page, from, to, ext4_get_block);
590
591 if (!ret && ext4_should_journal_data(inode)) {
592 ret = ext4_walk_page_buffers(handle, page_buffers(page),
593 from, to, NULL,
594 do_journal_get_write_access);
595 }
596
597 if (ret) {
598 unlock_page(page);
599 page_cache_release(page);
600 ext4_orphan_add(handle, inode);
601 up_write(&EXT4_I(inode)->xattr_sem);
602 sem_held = 0;
603 ext4_journal_stop(handle);
604 handle = NULL;
605 ext4_truncate_failed_write(inode);
606 /*
607 * If truncate failed early the inode might
608 * still be on the orphan list; we need to
609 * make sure the inode is removed from the
610 * orphan list in that case.
611 */
612 if (inode->i_nlink)
613 ext4_orphan_del(NULL, inode);
614 }
615
616 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
617 goto retry;
618
619 block_commit_write(page, from, to);
620out:
621 if (page) {
622 unlock_page(page);
623 page_cache_release(page);
624 }
625 if (sem_held)
626 up_write(&EXT4_I(inode)->xattr_sem);
627 if (handle)
628 ext4_journal_stop(handle);
629 brelse(iloc.bh);
630 return ret;
631}
632
633/*
634 * Try to write data in the inode.
635 * If the inode has inline data, check whether the new write can be
636 * in the inode also. If not, create the page the handle, move the data
637 * to the page make it update and let the later codes create extent for it.
638 */
639int ext4_try_to_write_inline_data(struct address_space *mapping,
640 struct inode *inode,
641 loff_t pos, unsigned len,
642 unsigned flags,
643 struct page **pagep)
644{
645 int ret;
646 handle_t *handle;
647 struct page *page;
648 struct ext4_iloc iloc;
649
650 if (pos + len > ext4_get_max_inline_size(inode))
651 goto convert;
652
653 ret = ext4_get_inode_loc(inode, &iloc);
654 if (ret)
655 return ret;
656
657 /*
658 * The possible write could happen in the inode,
659 * so try to reserve the space in inode first.
660 */
661 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
662 if (IS_ERR(handle)) {
663 ret = PTR_ERR(handle);
664 handle = NULL;
665 goto out;
666 }
667
668 ret = ext4_prepare_inline_data(handle, inode, pos + len);
669 if (ret && ret != -ENOSPC)
670 goto out;
671
672 /* We don't have space in inline inode, so convert it to extent. */
673 if (ret == -ENOSPC) {
674 ext4_journal_stop(handle);
675 brelse(iloc.bh);
676 goto convert;
677 }
678
679 flags |= AOP_FLAG_NOFS;
680
681 page = grab_cache_page_write_begin(mapping, 0, flags);
682 if (!page) {
683 ret = -ENOMEM;
684 goto out;
685 }
686
687 *pagep = page;
688 down_read(&EXT4_I(inode)->xattr_sem);
689 if (!ext4_has_inline_data(inode)) {
690 ret = 0;
691 unlock_page(page);
692 page_cache_release(page);
693 goto out_up_read;
694 }
695
696 if (!PageUptodate(page)) {
697 ret = ext4_read_inline_page(inode, page);
698 if (ret < 0)
699 goto out_up_read;
700 }
701
702 ret = 1;
703 handle = NULL;
704out_up_read:
705 up_read(&EXT4_I(inode)->xattr_sem);
706out:
707 if (handle)
708 ext4_journal_stop(handle);
709 brelse(iloc.bh);
710 return ret;
711convert:
712 return ext4_convert_inline_data_to_extent(mapping,
713 inode, flags);
714}
715
716int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
717 unsigned copied, struct page *page)
718{
719 int ret;
720 void *kaddr;
721 struct ext4_iloc iloc;
722
723 if (unlikely(copied < len)) {
724 if (!PageUptodate(page)) {
725 copied = 0;
726 goto out;
727 }
728 }
729
730 ret = ext4_get_inode_loc(inode, &iloc);
731 if (ret) {
732 ext4_std_error(inode->i_sb, ret);
733 copied = 0;
734 goto out;
735 }
736
737 down_write(&EXT4_I(inode)->xattr_sem);
738 BUG_ON(!ext4_has_inline_data(inode));
739
740 kaddr = kmap_atomic(page);
741 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
742 kunmap_atomic(kaddr);
743 SetPageUptodate(page);
744 /* clear page dirty so that writepages wouldn't work for us. */
745 ClearPageDirty(page);
746
747 up_write(&EXT4_I(inode)->xattr_sem);
748 brelse(iloc.bh);
749out:
750 return copied;
751}
752
753struct buffer_head *
754ext4_journalled_write_inline_data(struct inode *inode,
755 unsigned len,
756 struct page *page)
757{
758 int ret;
759 void *kaddr;
760 struct ext4_iloc iloc;
761
762 ret = ext4_get_inode_loc(inode, &iloc);
763 if (ret) {
764 ext4_std_error(inode->i_sb, ret);
765 return NULL;
766 }
767
768 down_write(&EXT4_I(inode)->xattr_sem);
769 kaddr = kmap_atomic(page);
770 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
771 kunmap_atomic(kaddr);
772 up_write(&EXT4_I(inode)->xattr_sem);
773
774 return iloc.bh;
775}
776
777/*
778 * Try to make the page cache and handle ready for the inline data case.
779 * We can call this function in 2 cases:
780 * 1. The inode is created and the first write exceeds inline size. We can
781 * clear the inode state safely.
782 * 2. The inode has inline data, then we need to read the data, make it
783 * update and dirty so that ext4_da_writepages can handle it. We don't
784 * need to start the journal since the file's metatdata isn't changed now.
785 */
786static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
787 struct inode *inode,
788 unsigned flags,
789 void **fsdata)
790{
791 int ret = 0, inline_size;
792 struct page *page;
793
794 page = grab_cache_page_write_begin(mapping, 0, flags);
795 if (!page)
796 return -ENOMEM;
797
798 down_read(&EXT4_I(inode)->xattr_sem);
799 if (!ext4_has_inline_data(inode)) {
800 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
801 goto out;
802 }
803
804 inline_size = ext4_get_inline_size(inode);
805
806 if (!PageUptodate(page)) {
807 ret = ext4_read_inline_page(inode, page);
808 if (ret < 0)
809 goto out;
810 }
811
812 ret = __block_write_begin(page, 0, inline_size,
813 ext4_da_get_block_prep);
814 if (ret) {
815 ext4_truncate_failed_write(inode);
816 goto out;
817 }
818
819 SetPageDirty(page);
820 SetPageUptodate(page);
821 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
822 *fsdata = (void *)CONVERT_INLINE_DATA;
823
824out:
825 up_read(&EXT4_I(inode)->xattr_sem);
826 if (page) {
827 unlock_page(page);
828 page_cache_release(page);
829 }
830 return ret;
831}
832
833/*
834 * Prepare the write for the inline data.
835 * If the the data can be written into the inode, we just read
836 * the page and make it uptodate, and start the journal.
837 * Otherwise read the page, makes it dirty so that it can be
838 * handle in writepages(the i_disksize update is left to the
839 * normal ext4_da_write_end).
840 */
841int ext4_da_write_inline_data_begin(struct address_space *mapping,
842 struct inode *inode,
843 loff_t pos, unsigned len,
844 unsigned flags,
845 struct page **pagep,
846 void **fsdata)
847{
848 int ret, inline_size;
849 handle_t *handle;
850 struct page *page;
851 struct ext4_iloc iloc;
852 int retries;
853
854 ret = ext4_get_inode_loc(inode, &iloc);
855 if (ret)
856 return ret;
857
858retry_journal:
859 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
860 if (IS_ERR(handle)) {
861 ret = PTR_ERR(handle);
862 goto out;
863 }
864
865 inline_size = ext4_get_max_inline_size(inode);
866
867 ret = -ENOSPC;
868 if (inline_size >= pos + len) {
869 ret = ext4_prepare_inline_data(handle, inode, pos + len);
870 if (ret && ret != -ENOSPC)
871 goto out_journal;
872 }
873
874 if (ret == -ENOSPC) {
875 ret = ext4_da_convert_inline_data_to_extent(mapping,
876 inode,
877 flags,
878 fsdata);
879 ext4_journal_stop(handle);
880 if (ret == -ENOSPC &&
881 ext4_should_retry_alloc(inode->i_sb, &retries))
882 goto retry_journal;
883 goto out;
884 }
885
886 /*
887 * We cannot recurse into the filesystem as the transaction
888 * is already started.
889 */
890 flags |= AOP_FLAG_NOFS;
891
892 page = grab_cache_page_write_begin(mapping, 0, flags);
893 if (!page) {
894 ret = -ENOMEM;
895 goto out_journal;
896 }
897
898 down_read(&EXT4_I(inode)->xattr_sem);
899 if (!ext4_has_inline_data(inode)) {
900 ret = 0;
901 goto out_release_page;
902 }
903
904 if (!PageUptodate(page)) {
905 ret = ext4_read_inline_page(inode, page);
906 if (ret < 0)
907 goto out_release_page;
908 }
909
910 up_read(&EXT4_I(inode)->xattr_sem);
911 *pagep = page;
912 brelse(iloc.bh);
913 return 1;
914out_release_page:
915 up_read(&EXT4_I(inode)->xattr_sem);
916 unlock_page(page);
917 page_cache_release(page);
918out_journal:
919 ext4_journal_stop(handle);
920out:
921 brelse(iloc.bh);
922 return ret;
923}
924
925int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
926 unsigned len, unsigned copied,
927 struct page *page)
928{
929 int i_size_changed = 0;
930
931 copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
932
933 /*
934 * No need to use i_size_read() here, the i_size
935 * cannot change under us because we hold i_mutex.
936 *
937 * But it's important to update i_size while still holding page lock:
938 * page writeout could otherwise come in and zero beyond i_size.
939 */
940 if (pos+copied > inode->i_size) {
941 i_size_write(inode, pos+copied);
942 i_size_changed = 1;
943 }
944 unlock_page(page);
945 page_cache_release(page);
946
947 /*
948 * Don't mark the inode dirty under page lock. First, it unnecessarily
949 * makes the holding time of page lock longer. Second, it forces lock
950 * ordering of page lock and transaction start for journaling
951 * filesystems.
952 */
953 if (i_size_changed)
954 mark_inode_dirty(inode);
955
956 return copied;
957}
958
959#ifdef INLINE_DIR_DEBUG
960void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
961 void *inline_start, int inline_size)
962{
963 int offset;
964 unsigned short de_len;
965 struct ext4_dir_entry_2 *de = inline_start;
966 void *dlimit = inline_start + inline_size;
967
968 trace_printk("inode %lu\n", dir->i_ino);
969 offset = 0;
970 while ((void *)de < dlimit) {
971 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
972 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
973 offset, de_len, de->name_len, de->name,
974 de->name_len, le32_to_cpu(de->inode));
975 if (ext4_check_dir_entry(dir, NULL, de, bh,
976 inline_start, inline_size, offset))
977 BUG();
978
979 offset += de_len;
980 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
981 }
982}
983#else
984#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
985#endif
986
987/*
988 * Add a new entry into a inline dir.
989 * It will return -ENOSPC if no space is available, and -EIO
990 * and -EEXIST if directory entry already exists.
991 */
992static int ext4_add_dirent_to_inline(handle_t *handle,
993 struct dentry *dentry,
994 struct inode *inode,
995 struct ext4_iloc *iloc,
996 void *inline_start, int inline_size)
997{
998 struct inode *dir = dentry->d_parent->d_inode;
999 const char *name = dentry->d_name.name;
1000 int namelen = dentry->d_name.len;
1001 int err;
1002 struct ext4_dir_entry_2 *de;
1003
1004 err = ext4_find_dest_de(dir, inode, iloc->bh,
1005 inline_start, inline_size,
1006 name, namelen, &de);
1007 if (err)
1008 return err;
1009
1010 err = ext4_journal_get_write_access(handle, iloc->bh);
1011 if (err)
1012 return err;
1013 ext4_insert_dentry(inode, de, inline_size, name, namelen);
1014
1015 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1016
1017 /*
1018 * XXX shouldn't update any times until successful
1019 * completion of syscall, but too many callers depend
1020 * on this.
1021 *
1022 * XXX similarly, too many callers depend on
1023 * ext4_new_inode() setting the times, but error
1024 * recovery deletes the inode, so the worst that can
1025 * happen is that the times are slightly out of date
1026 * and/or different from the directory change time.
1027 */
1028 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1029 ext4_update_dx_flag(dir);
1030 dir->i_version++;
1031 ext4_mark_inode_dirty(handle, dir);
1032 return 1;
1033}
1034
1035static void *ext4_get_inline_xattr_pos(struct inode *inode,
1036 struct ext4_iloc *iloc)
1037{
1038 struct ext4_xattr_entry *entry;
1039 struct ext4_xattr_ibody_header *header;
1040
1041 BUG_ON(!EXT4_I(inode)->i_inline_off);
1042
1043 header = IHDR(inode, ext4_raw_inode(iloc));
1044 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1045 EXT4_I(inode)->i_inline_off);
1046
1047 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1048}
1049
1050/* Set the final de to cover the whole block. */
1051static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1052{
1053 struct ext4_dir_entry_2 *de, *prev_de;
1054 void *limit;
1055 int de_len;
1056
1057 de = (struct ext4_dir_entry_2 *)de_buf;
1058 if (old_size) {
1059 limit = de_buf + old_size;
1060 do {
1061 prev_de = de;
1062 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1063 de_buf += de_len;
1064 de = (struct ext4_dir_entry_2 *)de_buf;
1065 } while (de_buf < limit);
1066
1067 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1068 old_size, new_size);
1069 } else {
1070 /* this is just created, so create an empty entry. */
1071 de->inode = 0;
1072 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1073 }
1074}
1075
1076static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1077 struct ext4_iloc *iloc)
1078{
1079 int ret;
1080 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1081 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1082
1083 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1084 return -ENOSPC;
1085
1086 ret = ext4_update_inline_data(handle, dir,
1087 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1088 if (ret)
1089 return ret;
1090
1091 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1092 EXT4_I(dir)->i_inline_size -
1093 EXT4_MIN_INLINE_DATA_SIZE);
1094 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1095 return 0;
1096}
1097
1098static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1099 struct ext4_iloc *iloc,
1100 void *buf, int inline_size)
1101{
1102 ext4_create_inline_data(handle, inode, inline_size);
1103 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1104 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1105}
1106
1107static int ext4_finish_convert_inline_dir(handle_t *handle,
1108 struct inode *inode,
1109 struct buffer_head *dir_block,
1110 void *buf,
1111 int inline_size)
1112{
1113 int err, csum_size = 0, header_size = 0;
1114 struct ext4_dir_entry_2 *de;
1115 struct ext4_dir_entry_tail *t;
1116 void *target = dir_block->b_data;
1117
1118 /*
1119 * First create "." and ".." and then copy the dir information
1120 * back to the block.
1121 */
1122 de = (struct ext4_dir_entry_2 *)target;
1123 de = ext4_init_dot_dotdot(inode, de,
1124 inode->i_sb->s_blocksize, csum_size,
1125 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1126 header_size = (void *)de - target;
1127
1128 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1129 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1130
1131 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1132 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1133 csum_size = sizeof(struct ext4_dir_entry_tail);
1134
1135 inode->i_size = inode->i_sb->s_blocksize;
1136 i_size_write(inode, inode->i_sb->s_blocksize);
1137 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1138 ext4_update_final_de(dir_block->b_data,
1139 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1140 inode->i_sb->s_blocksize - csum_size);
1141
1142 if (csum_size) {
1143 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1144 inode->i_sb->s_blocksize);
1145 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1146 }
1147 set_buffer_uptodate(dir_block);
1148 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1149 if (err)
1150 goto out;
1151 set_buffer_verified(dir_block);
1152out:
1153 return err;
1154}
1155
1156static int ext4_convert_inline_data_nolock(handle_t *handle,
1157 struct inode *inode,
1158 struct ext4_iloc *iloc)
1159{
1160 int error;
1161 void *buf = NULL;
1162 struct buffer_head *data_bh = NULL;
1163 struct ext4_map_blocks map;
1164 int inline_size;
1165
1166 inline_size = ext4_get_inline_size(inode);
1167 buf = kmalloc(inline_size, GFP_NOFS);
1168 if (!buf) {
1169 error = -ENOMEM;
1170 goto out;
1171 }
1172
1173 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1174 if (error < 0)
1175 goto out;
1176
1177 error = ext4_destroy_inline_data_nolock(handle, inode);
1178 if (error)
1179 goto out;
1180
1181 map.m_lblk = 0;
1182 map.m_len = 1;
1183 map.m_flags = 0;
1184 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1185 if (error < 0)
1186 goto out_restore;
1187 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1188 error = -EIO;
1189 goto out_restore;
1190 }
1191
1192 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1193 if (!data_bh) {
1194 error = -ENOMEM;
1195 goto out_restore;
1196 }
1197
1198 lock_buffer(data_bh);
1199 error = ext4_journal_get_create_access(handle, data_bh);
1200 if (error) {
1201 unlock_buffer(data_bh);
1202 error = -EIO;
1203 goto out_restore;
1204 }
1205 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1206
1207 if (!S_ISDIR(inode->i_mode)) {
1208 memcpy(data_bh->b_data, buf, inline_size);
1209 set_buffer_uptodate(data_bh);
1210 error = ext4_handle_dirty_metadata(handle,
1211 inode, data_bh);
1212 } else {
1213 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1214 buf, inline_size);
1215 }
1216
1217 unlock_buffer(data_bh);
1218out_restore:
1219 if (error)
1220 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1221
1222out:
1223 brelse(data_bh);
1224 kfree(buf);
1225 return error;
1226}
1227
1228/*
1229 * Try to add the new entry to the inline data.
1230 * If succeeds, return 0. If not, extended the inline dir and copied data to
1231 * the new created block.
1232 */
1233int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1234 struct inode *inode)
1235{
1236 int ret, inline_size;
1237 void *inline_start;
1238 struct ext4_iloc iloc;
1239 struct inode *dir = dentry->d_parent->d_inode;
1240
1241 ret = ext4_get_inode_loc(dir, &iloc);
1242 if (ret)
1243 return ret;
1244
1245 down_write(&EXT4_I(dir)->xattr_sem);
1246 if (!ext4_has_inline_data(dir))
1247 goto out;
1248
1249 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1250 EXT4_INLINE_DOTDOT_SIZE;
1251 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1252
1253 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1254 inline_start, inline_size);
1255 if (ret != -ENOSPC)
1256 goto out;
1257
1258 /* check whether it can be inserted to inline xattr space. */
1259 inline_size = EXT4_I(dir)->i_inline_size -
1260 EXT4_MIN_INLINE_DATA_SIZE;
1261 if (!inline_size) {
1262 /* Try to use the xattr space.*/
1263 ret = ext4_update_inline_dir(handle, dir, &iloc);
1264 if (ret && ret != -ENOSPC)
1265 goto out;
1266
1267 inline_size = EXT4_I(dir)->i_inline_size -
1268 EXT4_MIN_INLINE_DATA_SIZE;
1269 }
1270
1271 if (inline_size) {
1272 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1273
1274 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1275 inline_start, inline_size);
1276
1277 if (ret != -ENOSPC)
1278 goto out;
1279 }
1280
1281 /*
1282 * The inline space is filled up, so create a new block for it.
1283 * As the extent tree will be created, we have to save the inline
1284 * dir first.
1285 */
1286 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1287
1288out:
1289 ext4_mark_inode_dirty(handle, dir);
1290 up_write(&EXT4_I(dir)->xattr_sem);
1291 brelse(iloc.bh);
1292 return ret;
1293}
1294
1295/*
1296 * This function fills a red-black tree with information from an
1297 * inlined dir. It returns the number directory entries loaded
1298 * into the tree. If there is an error it is returned in err.
1299 */
1300int htree_inlinedir_to_tree(struct file *dir_file,
1301 struct inode *dir, ext4_lblk_t block,
1302 struct dx_hash_info *hinfo,
1303 __u32 start_hash, __u32 start_minor_hash,
1304 int *has_inline_data)
1305{
1306 int err = 0, count = 0;
1307 unsigned int parent_ino;
1308 int pos;
1309 struct ext4_dir_entry_2 *de;
1310 struct inode *inode = file_inode(dir_file);
1311 int ret, inline_size = 0;
1312 struct ext4_iloc iloc;
1313 void *dir_buf = NULL;
1314 struct ext4_dir_entry_2 fake;
1315
1316 ret = ext4_get_inode_loc(inode, &iloc);
1317 if (ret)
1318 return ret;
1319
1320 down_read(&EXT4_I(inode)->xattr_sem);
1321 if (!ext4_has_inline_data(inode)) {
1322 up_read(&EXT4_I(inode)->xattr_sem);
1323 *has_inline_data = 0;
1324 goto out;
1325 }
1326
1327 inline_size = ext4_get_inline_size(inode);
1328 dir_buf = kmalloc(inline_size, GFP_NOFS);
1329 if (!dir_buf) {
1330 ret = -ENOMEM;
1331 up_read(&EXT4_I(inode)->xattr_sem);
1332 goto out;
1333 }
1334
1335 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1336 up_read(&EXT4_I(inode)->xattr_sem);
1337 if (ret < 0)
1338 goto out;
1339
1340 pos = 0;
1341 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1342 while (pos < inline_size) {
1343 /*
1344 * As inlined dir doesn't store any information about '.' and
1345 * only the inode number of '..' is stored, we have to handle
1346 * them differently.
1347 */
1348 if (pos == 0) {
1349 fake.inode = cpu_to_le32(inode->i_ino);
1350 fake.name_len = 1;
1351 strcpy(fake.name, ".");
1352 fake.rec_len = ext4_rec_len_to_disk(
1353 EXT4_DIR_REC_LEN(fake.name_len),
1354 inline_size);
1355 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1356 de = &fake;
1357 pos = EXT4_INLINE_DOTDOT_OFFSET;
1358 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1359 fake.inode = cpu_to_le32(parent_ino);
1360 fake.name_len = 2;
1361 strcpy(fake.name, "..");
1362 fake.rec_len = ext4_rec_len_to_disk(
1363 EXT4_DIR_REC_LEN(fake.name_len),
1364 inline_size);
1365 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1366 de = &fake;
1367 pos = EXT4_INLINE_DOTDOT_SIZE;
1368 } else {
1369 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1370 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1371 if (ext4_check_dir_entry(inode, dir_file, de,
1372 iloc.bh, dir_buf,
1373 inline_size, pos)) {
1374 ret = count;
1375 goto out;
1376 }
1377 }
1378
1379 ext4fs_dirhash(de->name, de->name_len, hinfo);
1380 if ((hinfo->hash < start_hash) ||
1381 ((hinfo->hash == start_hash) &&
1382 (hinfo->minor_hash < start_minor_hash)))
1383 continue;
1384 if (de->inode == 0)
1385 continue;
1386 err = ext4_htree_store_dirent(dir_file,
1387 hinfo->hash, hinfo->minor_hash, de);
1388 if (err) {
1389 count = err;
1390 goto out;
1391 }
1392 count++;
1393 }
1394 ret = count;
1395out:
1396 kfree(dir_buf);
1397 brelse(iloc.bh);
1398 return ret;
1399}
1400
1401/*
1402 * So this function is called when the volume is mkfsed with
1403 * dir_index disabled. In order to keep f_pos persistent
1404 * after we convert from an inlined dir to a blocked based,
1405 * we just pretend that we are a normal dir and return the
1406 * offset as if '.' and '..' really take place.
1407 *
1408 */
1409int ext4_read_inline_dir(struct file *file,
1410 struct dir_context *ctx,
1411 int *has_inline_data)
1412{
1413 unsigned int offset, parent_ino;
1414 int i;
1415 struct ext4_dir_entry_2 *de;
1416 struct super_block *sb;
1417 struct inode *inode = file_inode(file);
1418 int ret, inline_size = 0;
1419 struct ext4_iloc iloc;
1420 void *dir_buf = NULL;
1421 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1422
1423 ret = ext4_get_inode_loc(inode, &iloc);
1424 if (ret)
1425 return ret;
1426
1427 down_read(&EXT4_I(inode)->xattr_sem);
1428 if (!ext4_has_inline_data(inode)) {
1429 up_read(&EXT4_I(inode)->xattr_sem);
1430 *has_inline_data = 0;
1431 goto out;
1432 }
1433
1434 inline_size = ext4_get_inline_size(inode);
1435 dir_buf = kmalloc(inline_size, GFP_NOFS);
1436 if (!dir_buf) {
1437 ret = -ENOMEM;
1438 up_read(&EXT4_I(inode)->xattr_sem);
1439 goto out;
1440 }
1441
1442 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1443 up_read(&EXT4_I(inode)->xattr_sem);
1444 if (ret < 0)
1445 goto out;
1446
1447 ret = 0;
1448 sb = inode->i_sb;
1449 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1450 offset = ctx->pos;
1451
1452 /*
1453 * dotdot_offset and dotdot_size is the real offset and
1454 * size for ".." and "." if the dir is block based while
1455 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1456 * So we will use extra_offset and extra_size to indicate them
1457 * during the inline dir iteration.
1458 */
1459 dotdot_offset = EXT4_DIR_REC_LEN(1);
1460 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1461 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1462 extra_size = extra_offset + inline_size;
1463
1464 /*
1465 * If the version has changed since the last call to
1466 * readdir(2), then we might be pointing to an invalid
1467 * dirent right now. Scan from the start of the inline
1468 * dir to make sure.
1469 */
1470 if (file->f_version != inode->i_version) {
1471 for (i = 0; i < extra_size && i < offset;) {
1472 /*
1473 * "." is with offset 0 and
1474 * ".." is dotdot_offset.
1475 */
1476 if (!i) {
1477 i = dotdot_offset;
1478 continue;
1479 } else if (i == dotdot_offset) {
1480 i = dotdot_size;
1481 continue;
1482 }
1483 /* for other entry, the real offset in
1484 * the buf has to be tuned accordingly.
1485 */
1486 de = (struct ext4_dir_entry_2 *)
1487 (dir_buf + i - extra_offset);
1488 /* It's too expensive to do a full
1489 * dirent test each time round this
1490 * loop, but we do have to test at
1491 * least that it is non-zero. A
1492 * failure will be detected in the
1493 * dirent test below. */
1494 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1495 < EXT4_DIR_REC_LEN(1))
1496 break;
1497 i += ext4_rec_len_from_disk(de->rec_len,
1498 extra_size);
1499 }
1500 offset = i;
1501 ctx->pos = offset;
1502 file->f_version = inode->i_version;
1503 }
1504
1505 while (ctx->pos < extra_size) {
1506 if (ctx->pos == 0) {
1507 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1508 goto out;
1509 ctx->pos = dotdot_offset;
1510 continue;
1511 }
1512
1513 if (ctx->pos == dotdot_offset) {
1514 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1515 goto out;
1516 ctx->pos = dotdot_size;
1517 continue;
1518 }
1519
1520 de = (struct ext4_dir_entry_2 *)
1521 (dir_buf + ctx->pos - extra_offset);
1522 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1523 extra_size, ctx->pos))
1524 goto out;
1525 if (le32_to_cpu(de->inode)) {
1526 if (!dir_emit(ctx, de->name, de->name_len,
1527 le32_to_cpu(de->inode),
1528 get_dtype(sb, de->file_type)))
1529 goto out;
1530 }
1531 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1532 }
1533out:
1534 kfree(dir_buf);
1535 brelse(iloc.bh);
1536 return ret;
1537}
1538
1539struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1540 struct ext4_dir_entry_2 **parent_de,
1541 int *retval)
1542{
1543 struct ext4_iloc iloc;
1544
1545 *retval = ext4_get_inode_loc(inode, &iloc);
1546 if (*retval)
1547 return NULL;
1548
1549 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1550
1551 return iloc.bh;
1552}
1553
1554/*
1555 * Try to create the inline data for the new dir.
1556 * If it succeeds, return 0, otherwise return the error.
1557 * In case of ENOSPC, the caller should create the normal disk layout dir.
1558 */
1559int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1560 struct inode *inode)
1561{
1562 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1563 struct ext4_iloc iloc;
1564 struct ext4_dir_entry_2 *de;
1565
1566 ret = ext4_get_inode_loc(inode, &iloc);
1567 if (ret)
1568 return ret;
1569
1570 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1571 if (ret)
1572 goto out;
1573
1574 /*
1575 * For inline dir, we only save the inode information for the ".."
1576 * and create a fake dentry to cover the left space.
1577 */
1578 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1579 de->inode = cpu_to_le32(parent->i_ino);
1580 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1581 de->inode = 0;
1582 de->rec_len = ext4_rec_len_to_disk(
1583 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1584 inline_size);
1585 set_nlink(inode, 2);
1586 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1587out:
1588 brelse(iloc.bh);
1589 return ret;
1590}
1591
1592struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1593 const struct qstr *d_name,
1594 struct ext4_dir_entry_2 **res_dir,
1595 int *has_inline_data)
1596{
1597 int ret;
1598 struct ext4_iloc iloc;
1599 void *inline_start;
1600 int inline_size;
1601
1602 if (ext4_get_inode_loc(dir, &iloc))
1603 return NULL;
1604
1605 down_read(&EXT4_I(dir)->xattr_sem);
1606 if (!ext4_has_inline_data(dir)) {
1607 *has_inline_data = 0;
1608 goto out;
1609 }
1610
1611 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1612 EXT4_INLINE_DOTDOT_SIZE;
1613 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1614 ret = search_dir(iloc.bh, inline_start, inline_size,
1615 dir, d_name, 0, res_dir);
1616 if (ret == 1)
1617 goto out_find;
1618 if (ret < 0)
1619 goto out;
1620
1621 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1622 goto out;
1623
1624 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1625 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1626
1627 ret = search_dir(iloc.bh, inline_start, inline_size,
1628 dir, d_name, 0, res_dir);
1629 if (ret == 1)
1630 goto out_find;
1631
1632out:
1633 brelse(iloc.bh);
1634 iloc.bh = NULL;
1635out_find:
1636 up_read(&EXT4_I(dir)->xattr_sem);
1637 return iloc.bh;
1638}
1639
1640int ext4_delete_inline_entry(handle_t *handle,
1641 struct inode *dir,
1642 struct ext4_dir_entry_2 *de_del,
1643 struct buffer_head *bh,
1644 int *has_inline_data)
1645{
1646 int err, inline_size;
1647 struct ext4_iloc iloc;
1648 void *inline_start;
1649
1650 err = ext4_get_inode_loc(dir, &iloc);
1651 if (err)
1652 return err;
1653
1654 down_write(&EXT4_I(dir)->xattr_sem);
1655 if (!ext4_has_inline_data(dir)) {
1656 *has_inline_data = 0;
1657 goto out;
1658 }
1659
1660 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1661 EXT4_MIN_INLINE_DATA_SIZE) {
1662 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1663 EXT4_INLINE_DOTDOT_SIZE;
1664 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1665 EXT4_INLINE_DOTDOT_SIZE;
1666 } else {
1667 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1668 inline_size = ext4_get_inline_size(dir) -
1669 EXT4_MIN_INLINE_DATA_SIZE;
1670 }
1671
1672 err = ext4_journal_get_write_access(handle, bh);
1673 if (err)
1674 goto out;
1675
1676 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1677 inline_start, inline_size, 0);
1678 if (err)
1679 goto out;
1680
1681 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1682 err = ext4_mark_inode_dirty(handle, dir);
1683 if (unlikely(err))
1684 goto out;
1685
1686 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1687out:
1688 up_write(&EXT4_I(dir)->xattr_sem);
1689 brelse(iloc.bh);
1690 if (err != -ENOENT)
1691 ext4_std_error(dir->i_sb, err);
1692 return err;
1693}
1694
1695/*
1696 * Get the inline dentry at offset.
1697 */
1698static inline struct ext4_dir_entry_2 *
1699ext4_get_inline_entry(struct inode *inode,
1700 struct ext4_iloc *iloc,
1701 unsigned int offset,
1702 void **inline_start,
1703 int *inline_size)
1704{
1705 void *inline_pos;
1706
1707 BUG_ON(offset > ext4_get_inline_size(inode));
1708
1709 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1710 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1711 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1712 } else {
1713 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1714 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1715 *inline_size = ext4_get_inline_size(inode) -
1716 EXT4_MIN_INLINE_DATA_SIZE;
1717 }
1718
1719 if (inline_start)
1720 *inline_start = inline_pos;
1721 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1722}
1723
1724int empty_inline_dir(struct inode *dir, int *has_inline_data)
1725{
1726 int err, inline_size;
1727 struct ext4_iloc iloc;
1728 void *inline_pos;
1729 unsigned int offset;
1730 struct ext4_dir_entry_2 *de;
1731 int ret = 1;
1732
1733 err = ext4_get_inode_loc(dir, &iloc);
1734 if (err) {
1735 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1736 err, dir->i_ino);
1737 return 1;
1738 }
1739
1740 down_read(&EXT4_I(dir)->xattr_sem);
1741 if (!ext4_has_inline_data(dir)) {
1742 *has_inline_data = 0;
1743 goto out;
1744 }
1745
1746 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1747 if (!le32_to_cpu(de->inode)) {
1748 ext4_warning(dir->i_sb,
1749 "bad inline directory (dir #%lu) - no `..'",
1750 dir->i_ino);
1751 ret = 1;
1752 goto out;
1753 }
1754
1755 offset = EXT4_INLINE_DOTDOT_SIZE;
1756 while (offset < dir->i_size) {
1757 de = ext4_get_inline_entry(dir, &iloc, offset,
1758 &inline_pos, &inline_size);
1759 if (ext4_check_dir_entry(dir, NULL, de,
1760 iloc.bh, inline_pos,
1761 inline_size, offset)) {
1762 ext4_warning(dir->i_sb,
1763 "bad inline directory (dir #%lu) - "
1764 "inode %u, rec_len %u, name_len %d"
1765 "inline size %d\n",
1766 dir->i_ino, le32_to_cpu(de->inode),
1767 le16_to_cpu(de->rec_len), de->name_len,
1768 inline_size);
1769 ret = 1;
1770 goto out;
1771 }
1772 if (le32_to_cpu(de->inode)) {
1773 ret = 0;
1774 goto out;
1775 }
1776 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1777 }
1778
1779out:
1780 up_read(&EXT4_I(dir)->xattr_sem);
1781 brelse(iloc.bh);
1782 return ret;
1783}
1784
1785int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1786{
1787 int ret;
1788
1789 down_write(&EXT4_I(inode)->xattr_sem);
1790 ret = ext4_destroy_inline_data_nolock(handle, inode);
1791 up_write(&EXT4_I(inode)->xattr_sem);
1792
1793 return ret;
1794}
1795
1796int ext4_inline_data_fiemap(struct inode *inode,
1797 struct fiemap_extent_info *fieinfo,
1798 int *has_inline)
1799{
1800 __u64 physical = 0;
1801 __u64 length;
1802 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1803 int error = 0;
1804 struct ext4_iloc iloc;
1805
1806 down_read(&EXT4_I(inode)->xattr_sem);
1807 if (!ext4_has_inline_data(inode)) {
1808 *has_inline = 0;
1809 goto out;
1810 }
1811
1812 error = ext4_get_inode_loc(inode, &iloc);
1813 if (error)
1814 goto out;
1815
1816 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1817 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1818 physical += offsetof(struct ext4_inode, i_block);
1819 length = i_size_read(inode);
1820
1821 if (physical)
1822 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1823 length, flags);
1824 brelse(iloc.bh);
1825out:
1826 up_read(&EXT4_I(inode)->xattr_sem);
1827 return (error < 0 ? error : 0);
1828}
1829
1830/*
1831 * Called during xattr set, and if we can sparse space 'needed',
1832 * just create the extent tree evict the data to the outer block.
1833 *
1834 * We use jbd2 instead of page cache to move data to the 1st block
1835 * so that the whole transaction can be committed as a whole and
1836 * the data isn't lost because of the delayed page cache write.
1837 */
1838int ext4_try_to_evict_inline_data(handle_t *handle,
1839 struct inode *inode,
1840 int needed)
1841{
1842 int error;
1843 struct ext4_xattr_entry *entry;
1844 struct ext4_inode *raw_inode;
1845 struct ext4_iloc iloc;
1846
1847 error = ext4_get_inode_loc(inode, &iloc);
1848 if (error)
1849 return error;
1850
1851 raw_inode = ext4_raw_inode(&iloc);
1852 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1853 EXT4_I(inode)->i_inline_off);
1854 if (EXT4_XATTR_LEN(entry->e_name_len) +
1855 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1856 error = -ENOSPC;
1857 goto out;
1858 }
1859
1860 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1861out:
1862 brelse(iloc.bh);
1863 return error;
1864}
1865
1866void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1867{
1868 handle_t *handle;
1869 int inline_size, value_len, needed_blocks;
1870 size_t i_size;
1871 void *value = NULL;
1872 struct ext4_xattr_ibody_find is = {
1873 .s = { .not_found = -ENODATA, },
1874 };
1875 struct ext4_xattr_info i = {
1876 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1877 .name = EXT4_XATTR_SYSTEM_DATA,
1878 };
1879
1880
1881 needed_blocks = ext4_writepage_trans_blocks(inode);
1882 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1883 if (IS_ERR(handle))
1884 return;
1885
1886 down_write(&EXT4_I(inode)->xattr_sem);
1887 if (!ext4_has_inline_data(inode)) {
1888 *has_inline = 0;
1889 ext4_journal_stop(handle);
1890 return;
1891 }
1892
1893 if (ext4_orphan_add(handle, inode))
1894 goto out;
1895
1896 if (ext4_get_inode_loc(inode, &is.iloc))
1897 goto out;
1898
1899 down_write(&EXT4_I(inode)->i_data_sem);
1900 i_size = inode->i_size;
1901 inline_size = ext4_get_inline_size(inode);
1902 EXT4_I(inode)->i_disksize = i_size;
1903
1904 if (i_size < inline_size) {
1905 /* Clear the content in the xattr space. */
1906 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1907 if (ext4_xattr_ibody_find(inode, &i, &is))
1908 goto out_error;
1909
1910 BUG_ON(is.s.not_found);
1911
1912 value_len = le32_to_cpu(is.s.here->e_value_size);
1913 value = kmalloc(value_len, GFP_NOFS);
1914 if (!value)
1915 goto out_error;
1916
1917 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1918 value, value_len))
1919 goto out_error;
1920
1921 i.value = value;
1922 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1923 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1924 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1925 goto out_error;
1926 }
1927
1928 /* Clear the content within i_blocks. */
1929 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1930 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1931 memset(p + i_size, 0,
1932 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1933 }
1934
1935 EXT4_I(inode)->i_inline_size = i_size <
1936 EXT4_MIN_INLINE_DATA_SIZE ?
1937 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1938 }
1939
1940out_error:
1941 up_write(&EXT4_I(inode)->i_data_sem);
1942out:
1943 brelse(is.iloc.bh);
1944 up_write(&EXT4_I(inode)->xattr_sem);
1945 kfree(value);
1946 if (inode->i_nlink)
1947 ext4_orphan_del(handle, inode);
1948
1949 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1950 ext4_mark_inode_dirty(handle, inode);
1951 if (IS_SYNC(inode))
1952 ext4_handle_sync(handle);
1953
1954 ext4_journal_stop(handle);
1955 return;
1956}
1957
1958int ext4_convert_inline_data(struct inode *inode)
1959{
1960 int error, needed_blocks;
1961 handle_t *handle;
1962 struct ext4_iloc iloc;
1963
1964 if (!ext4_has_inline_data(inode)) {
1965 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1966 return 0;
1967 }
1968
1969 needed_blocks = ext4_writepage_trans_blocks(inode);
1970
1971 iloc.bh = NULL;
1972 error = ext4_get_inode_loc(inode, &iloc);
1973 if (error)
1974 return error;
1975
1976 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1977 if (IS_ERR(handle)) {
1978 error = PTR_ERR(handle);
1979 goto out_free;
1980 }
1981
1982 down_write(&EXT4_I(inode)->xattr_sem);
1983 if (!ext4_has_inline_data(inode)) {
1984 up_write(&EXT4_I(inode)->xattr_sem);
1985 goto out;
1986 }
1987
1988 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1989 up_write(&EXT4_I(inode)->xattr_sem);
1990out:
1991 ext4_journal_stop(handle);
1992out_free:
1993 brelse(iloc.bh);
1994 return error;
1995}