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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / fs / ext4 / inline.c
blob437df6a1a8417cec309c699cfef2166f02b6930a
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
27 static 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
35 static 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
88 out:
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 */
97 int 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 */
130 int 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 }
159 out:
160 brelse(is.iloc.bh);
161 return error;
162 }
163
164 static 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
200 out:
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 */
210 static 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
246 static int ext4_create_inline_data(handle_t *handle,
247 struct inode *inode, unsigned len)
248 {
249 int error;
250 void *value = NULL;
251 struct ext4_xattr_ibody_find is = {
252 .s = { .not_found = -ENODATA, },
253 };
254 struct ext4_xattr_info i = {
255 .name_index = EXT4_XATTR_INDEX_SYSTEM,
256 .name = EXT4_XATTR_SYSTEM_DATA,
257 };
258
259 error = ext4_get_inode_loc(inode, &is.iloc);
260 if (error)
261 return error;
262
263 BUFFER_TRACE(is.iloc.bh, "get_write_access");
264 error = ext4_journal_get_write_access(handle, is.iloc.bh);
265 if (error)
266 goto out;
267
268 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
269 value = EXT4_ZERO_XATTR_VALUE;
270 len -= EXT4_MIN_INLINE_DATA_SIZE;
271 } else {
272 value = "";
273 len = 0;
274 }
275
276 /* Insert the the xttr entry. */
277 i.value = value;
278 i.value_len = len;
279
280 error = ext4_xattr_ibody_find(inode, &i, &is);
281 if (error)
282 goto out;
283
284 BUG_ON(!is.s.not_found);
285
286 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
287 if (error) {
288 if (error == -ENOSPC)
289 ext4_clear_inode_state(inode,
290 EXT4_STATE_MAY_INLINE_DATA);
291 goto out;
292 }
293
294 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
295 0, EXT4_MIN_INLINE_DATA_SIZE);
296
297 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
298 (void *)ext4_raw_inode(&is.iloc));
299 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
300 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
301 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
302 /*
303 * Propagate changes to inode->i_flags as well - e.g. S_DAX may
304 * get cleared
305 */
306 ext4_set_inode_flags(inode);
307 get_bh(is.iloc.bh);
308 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
309
310 out:
311 brelse(is.iloc.bh);
312 return error;
313 }
314
315 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
316 unsigned int len)
317 {
318 int error;
319 void *value = NULL;
320 struct ext4_xattr_ibody_find is = {
321 .s = { .not_found = -ENODATA, },
322 };
323 struct ext4_xattr_info i = {
324 .name_index = EXT4_XATTR_INDEX_SYSTEM,
325 .name = EXT4_XATTR_SYSTEM_DATA,
326 };
327
328 /* If the old space is ok, write the data directly. */
329 if (len <= EXT4_I(inode)->i_inline_size)
330 return 0;
331
332 error = ext4_get_inode_loc(inode, &is.iloc);
333 if (error)
334 return error;
335
336 error = ext4_xattr_ibody_find(inode, &i, &is);
337 if (error)
338 goto out;
339
340 BUG_ON(is.s.not_found);
341
342 len -= EXT4_MIN_INLINE_DATA_SIZE;
343 value = kzalloc(len, GFP_NOFS);
344 if (!value) {
345 error = -ENOMEM;
346 goto out;
347 }
348
349 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
350 value, len);
351 if (error == -ENODATA)
352 goto out;
353
354 BUFFER_TRACE(is.iloc.bh, "get_write_access");
355 error = ext4_journal_get_write_access(handle, is.iloc.bh);
356 if (error)
357 goto out;
358
359 /* Update the xttr entry. */
360 i.value = value;
361 i.value_len = len;
362
363 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
364 if (error)
365 goto out;
366
367 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
368 (void *)ext4_raw_inode(&is.iloc));
369 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
370 le32_to_cpu(is.s.here->e_value_size);
371 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
372 get_bh(is.iloc.bh);
373 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
374
375 out:
376 kfree(value);
377 brelse(is.iloc.bh);
378 return error;
379 }
380
381 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
382 unsigned int len)
383 {
384 int ret, size;
385 struct ext4_inode_info *ei = EXT4_I(inode);
386
387 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
388 return -ENOSPC;
389
390 size = ext4_get_max_inline_size(inode);
391 if (size < len)
392 return -ENOSPC;
393
394 down_write(&EXT4_I(inode)->xattr_sem);
395
396 if (ei->i_inline_off)
397 ret = ext4_update_inline_data(handle, inode, len);
398 else
399 ret = ext4_create_inline_data(handle, inode, len);
400
401 up_write(&EXT4_I(inode)->xattr_sem);
402
403 return ret;
404 }
405
406 static int ext4_destroy_inline_data_nolock(handle_t *handle,
407 struct inode *inode)
408 {
409 struct ext4_inode_info *ei = EXT4_I(inode);
410 struct ext4_xattr_ibody_find is = {
411 .s = { .not_found = 0, },
412 };
413 struct ext4_xattr_info i = {
414 .name_index = EXT4_XATTR_INDEX_SYSTEM,
415 .name = EXT4_XATTR_SYSTEM_DATA,
416 .value = NULL,
417 .value_len = 0,
418 };
419 int error;
420
421 if (!ei->i_inline_off)
422 return 0;
423
424 error = ext4_get_inode_loc(inode, &is.iloc);
425 if (error)
426 return error;
427
428 error = ext4_xattr_ibody_find(inode, &i, &is);
429 if (error)
430 goto out;
431
432 BUFFER_TRACE(is.iloc.bh, "get_write_access");
433 error = ext4_journal_get_write_access(handle, is.iloc.bh);
434 if (error)
435 goto out;
436
437 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
438 if (error)
439 goto out;
440
441 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
442 0, EXT4_MIN_INLINE_DATA_SIZE);
443
444 if (ext4_has_feature_extents(inode->i_sb)) {
445 if (S_ISDIR(inode->i_mode) ||
446 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
447 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
448 ext4_ext_tree_init(handle, inode);
449 }
450 }
451 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
452 /*
453 * Propagate changes to inode->i_flags as well - e.g. S_DAX may
454 * get set.
455 */
456 ext4_set_inode_flags(inode);
457
458 get_bh(is.iloc.bh);
459 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
460
461 EXT4_I(inode)->i_inline_off = 0;
462 EXT4_I(inode)->i_inline_size = 0;
463 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
464 out:
465 brelse(is.iloc.bh);
466 if (error == -ENODATA)
467 error = 0;
468 return error;
469 }
470
471 static int ext4_read_inline_page(struct inode *inode, struct page *page)
472 {
473 void *kaddr;
474 int ret = 0;
475 size_t len;
476 struct ext4_iloc iloc;
477
478 BUG_ON(!PageLocked(page));
479 BUG_ON(!ext4_has_inline_data(inode));
480 BUG_ON(page->index);
481
482 if (!EXT4_I(inode)->i_inline_off) {
483 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
484 inode->i_ino);
485 goto out;
486 }
487
488 ret = ext4_get_inode_loc(inode, &iloc);
489 if (ret)
490 goto out;
491
492 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
493 kaddr = kmap_atomic(page);
494 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
495 flush_dcache_page(page);
496 kunmap_atomic(kaddr);
497 zero_user_segment(page, len, PAGE_SIZE);
498 SetPageUptodate(page);
499 brelse(iloc.bh);
500
501 out:
502 return ret;
503 }
504
505 int ext4_readpage_inline(struct inode *inode, struct page *page)
506 {
507 int ret = 0;
508
509 down_read(&EXT4_I(inode)->xattr_sem);
510 if (!ext4_has_inline_data(inode)) {
511 up_read(&EXT4_I(inode)->xattr_sem);
512 return -EAGAIN;
513 }
514
515 /*
516 * Current inline data can only exist in the 1st page,
517 * So for all the other pages, just set them uptodate.
518 */
519 if (!page->index)
520 ret = ext4_read_inline_page(inode, page);
521 else if (!PageUptodate(page)) {
522 zero_user_segment(page, 0, PAGE_SIZE);
523 SetPageUptodate(page);
524 }
525
526 up_read(&EXT4_I(inode)->xattr_sem);
527
528 unlock_page(page);
529 return ret >= 0 ? 0 : ret;
530 }
531
532 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
533 struct inode *inode,
534 unsigned flags)
535 {
536 int ret, needed_blocks;
537 handle_t *handle = NULL;
538 int retries = 0, sem_held = 0;
539 struct page *page = NULL;
540 unsigned from, to;
541 struct ext4_iloc iloc;
542
543 if (!ext4_has_inline_data(inode)) {
544 /*
545 * clear the flag so that no new write
546 * will trap here again.
547 */
548 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
549 return 0;
550 }
551
552 needed_blocks = ext4_writepage_trans_blocks(inode);
553
554 ret = ext4_get_inode_loc(inode, &iloc);
555 if (ret)
556 return ret;
557
558 retry:
559 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
560 if (IS_ERR(handle)) {
561 ret = PTR_ERR(handle);
562 handle = NULL;
563 goto out;
564 }
565
566 /* We cannot recurse into the filesystem as the transaction is already
567 * started */
568 flags |= AOP_FLAG_NOFS;
569
570 page = grab_cache_page_write_begin(mapping, 0, flags);
571 if (!page) {
572 ret = -ENOMEM;
573 goto out;
574 }
575
576 down_write(&EXT4_I(inode)->xattr_sem);
577 sem_held = 1;
578 /* If some one has already done this for us, just exit. */
579 if (!ext4_has_inline_data(inode)) {
580 ret = 0;
581 goto out;
582 }
583
584 from = 0;
585 to = ext4_get_inline_size(inode);
586 if (!PageUptodate(page)) {
587 ret = ext4_read_inline_page(inode, page);
588 if (ret < 0)
589 goto out;
590 }
591
592 ret = ext4_destroy_inline_data_nolock(handle, inode);
593 if (ret)
594 goto out;
595
596 if (ext4_should_dioread_nolock(inode)) {
597 ret = __block_write_begin(page, from, to,
598 ext4_get_block_unwritten);
599 } else
600 ret = __block_write_begin(page, from, to, ext4_get_block);
601
602 if (!ret && ext4_should_journal_data(inode)) {
603 ret = ext4_walk_page_buffers(handle, page_buffers(page),
604 from, to, NULL,
605 do_journal_get_write_access);
606 }
607
608 if (ret) {
609 unlock_page(page);
610 put_page(page);
611 page = NULL;
612 ext4_orphan_add(handle, inode);
613 up_write(&EXT4_I(inode)->xattr_sem);
614 sem_held = 0;
615 ext4_journal_stop(handle);
616 handle = NULL;
617 ext4_truncate_failed_write(inode);
618 /*
619 * If truncate failed early the inode might
620 * still be on the orphan list; we need to
621 * make sure the inode is removed from the
622 * orphan list in that case.
623 */
624 if (inode->i_nlink)
625 ext4_orphan_del(NULL, inode);
626 }
627
628 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
629 goto retry;
630
631 if (page)
632 block_commit_write(page, from, to);
633 out:
634 if (page) {
635 unlock_page(page);
636 put_page(page);
637 }
638 if (sem_held)
639 up_write(&EXT4_I(inode)->xattr_sem);
640 if (handle)
641 ext4_journal_stop(handle);
642 brelse(iloc.bh);
643 return ret;
644 }
645
646 /*
647 * Try to write data in the inode.
648 * If the inode has inline data, check whether the new write can be
649 * in the inode also. If not, create the page the handle, move the data
650 * to the page make it update and let the later codes create extent for it.
651 */
652 int ext4_try_to_write_inline_data(struct address_space *mapping,
653 struct inode *inode,
654 loff_t pos, unsigned len,
655 unsigned flags,
656 struct page **pagep)
657 {
658 int ret;
659 handle_t *handle;
660 struct page *page;
661 struct ext4_iloc iloc;
662
663 if (pos + len > ext4_get_max_inline_size(inode))
664 goto convert;
665
666 ret = ext4_get_inode_loc(inode, &iloc);
667 if (ret)
668 return ret;
669
670 /*
671 * The possible write could happen in the inode,
672 * so try to reserve the space in inode first.
673 */
674 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
675 if (IS_ERR(handle)) {
676 ret = PTR_ERR(handle);
677 handle = NULL;
678 goto out;
679 }
680
681 ret = ext4_prepare_inline_data(handle, inode, pos + len);
682 if (ret && ret != -ENOSPC)
683 goto out;
684
685 /* We don't have space in inline inode, so convert it to extent. */
686 if (ret == -ENOSPC) {
687 ext4_journal_stop(handle);
688 brelse(iloc.bh);
689 goto convert;
690 }
691
692 flags |= AOP_FLAG_NOFS;
693
694 page = grab_cache_page_write_begin(mapping, 0, flags);
695 if (!page) {
696 ret = -ENOMEM;
697 goto out;
698 }
699
700 *pagep = page;
701 down_read(&EXT4_I(inode)->xattr_sem);
702 if (!ext4_has_inline_data(inode)) {
703 ret = 0;
704 unlock_page(page);
705 put_page(page);
706 goto out_up_read;
707 }
708
709 if (!PageUptodate(page)) {
710 ret = ext4_read_inline_page(inode, page);
711 if (ret < 0)
712 goto out_up_read;
713 }
714
715 ret = 1;
716 handle = NULL;
717 out_up_read:
718 up_read(&EXT4_I(inode)->xattr_sem);
719 out:
720 if (handle)
721 ext4_journal_stop(handle);
722 brelse(iloc.bh);
723 return ret;
724 convert:
725 return ext4_convert_inline_data_to_extent(mapping,
726 inode, flags);
727 }
728
729 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
730 unsigned copied, struct page *page)
731 {
732 int ret;
733 void *kaddr;
734 struct ext4_iloc iloc;
735
736 if (unlikely(copied < len)) {
737 if (!PageUptodate(page)) {
738 copied = 0;
739 goto out;
740 }
741 }
742
743 ret = ext4_get_inode_loc(inode, &iloc);
744 if (ret) {
745 ext4_std_error(inode->i_sb, ret);
746 copied = 0;
747 goto out;
748 }
749
750 down_write(&EXT4_I(inode)->xattr_sem);
751 BUG_ON(!ext4_has_inline_data(inode));
752
753 kaddr = kmap_atomic(page);
754 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
755 kunmap_atomic(kaddr);
756 SetPageUptodate(page);
757 /* clear page dirty so that writepages wouldn't work for us. */
758 ClearPageDirty(page);
759
760 up_write(&EXT4_I(inode)->xattr_sem);
761 brelse(iloc.bh);
762 out:
763 return copied;
764 }
765
766 struct buffer_head *
767 ext4_journalled_write_inline_data(struct inode *inode,
768 unsigned len,
769 struct page *page)
770 {
771 int ret;
772 void *kaddr;
773 struct ext4_iloc iloc;
774
775 ret = ext4_get_inode_loc(inode, &iloc);
776 if (ret) {
777 ext4_std_error(inode->i_sb, ret);
778 return NULL;
779 }
780
781 down_write(&EXT4_I(inode)->xattr_sem);
782 kaddr = kmap_atomic(page);
783 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
784 kunmap_atomic(kaddr);
785 up_write(&EXT4_I(inode)->xattr_sem);
786
787 return iloc.bh;
788 }
789
790 /*
791 * Try to make the page cache and handle ready for the inline data case.
792 * We can call this function in 2 cases:
793 * 1. The inode is created and the first write exceeds inline size. We can
794 * clear the inode state safely.
795 * 2. The inode has inline data, then we need to read the data, make it
796 * update and dirty so that ext4_da_writepages can handle it. We don't
797 * need to start the journal since the file's metatdata isn't changed now.
798 */
799 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
800 struct inode *inode,
801 unsigned flags,
802 void **fsdata)
803 {
804 int ret = 0, inline_size;
805 struct page *page;
806
807 page = grab_cache_page_write_begin(mapping, 0, flags);
808 if (!page)
809 return -ENOMEM;
810
811 down_read(&EXT4_I(inode)->xattr_sem);
812 if (!ext4_has_inline_data(inode)) {
813 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
814 goto out;
815 }
816
817 inline_size = ext4_get_inline_size(inode);
818
819 if (!PageUptodate(page)) {
820 ret = ext4_read_inline_page(inode, page);
821 if (ret < 0)
822 goto out;
823 }
824
825 ret = __block_write_begin(page, 0, inline_size,
826 ext4_da_get_block_prep);
827 if (ret) {
828 up_read(&EXT4_I(inode)->xattr_sem);
829 unlock_page(page);
830 put_page(page);
831 ext4_truncate_failed_write(inode);
832 return ret;
833 }
834
835 SetPageDirty(page);
836 SetPageUptodate(page);
837 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
838 *fsdata = (void *)CONVERT_INLINE_DATA;
839
840 out:
841 up_read(&EXT4_I(inode)->xattr_sem);
842 if (page) {
843 unlock_page(page);
844 put_page(page);
845 }
846 return ret;
847 }
848
849 /*
850 * Prepare the write for the inline data.
851 * If the the data can be written into the inode, we just read
852 * the page and make it uptodate, and start the journal.
853 * Otherwise read the page, makes it dirty so that it can be
854 * handle in writepages(the i_disksize update is left to the
855 * normal ext4_da_write_end).
856 */
857 int ext4_da_write_inline_data_begin(struct address_space *mapping,
858 struct inode *inode,
859 loff_t pos, unsigned len,
860 unsigned flags,
861 struct page **pagep,
862 void **fsdata)
863 {
864 int ret, inline_size;
865 handle_t *handle;
866 struct page *page;
867 struct ext4_iloc iloc;
868 int retries;
869
870 ret = ext4_get_inode_loc(inode, &iloc);
871 if (ret)
872 return ret;
873
874 retry_journal:
875 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
876 if (IS_ERR(handle)) {
877 ret = PTR_ERR(handle);
878 goto out;
879 }
880
881 inline_size = ext4_get_max_inline_size(inode);
882
883 ret = -ENOSPC;
884 if (inline_size >= pos + len) {
885 ret = ext4_prepare_inline_data(handle, inode, pos + len);
886 if (ret && ret != -ENOSPC)
887 goto out_journal;
888 }
889
890 /*
891 * We cannot recurse into the filesystem as the transaction
892 * is already started.
893 */
894 flags |= AOP_FLAG_NOFS;
895
896 if (ret == -ENOSPC) {
897 ret = ext4_da_convert_inline_data_to_extent(mapping,
898 inode,
899 flags,
900 fsdata);
901 ext4_journal_stop(handle);
902 if (ret == -ENOSPC &&
903 ext4_should_retry_alloc(inode->i_sb, &retries))
904 goto retry_journal;
905 goto out;
906 }
907
908
909 page = grab_cache_page_write_begin(mapping, 0, flags);
910 if (!page) {
911 ret = -ENOMEM;
912 goto out_journal;
913 }
914
915 down_read(&EXT4_I(inode)->xattr_sem);
916 if (!ext4_has_inline_data(inode)) {
917 ret = 0;
918 goto out_release_page;
919 }
920
921 if (!PageUptodate(page)) {
922 ret = ext4_read_inline_page(inode, page);
923 if (ret < 0)
924 goto out_release_page;
925 }
926
927 up_read(&EXT4_I(inode)->xattr_sem);
928 *pagep = page;
929 brelse(iloc.bh);
930 return 1;
931 out_release_page:
932 up_read(&EXT4_I(inode)->xattr_sem);
933 unlock_page(page);
934 put_page(page);
935 out_journal:
936 ext4_journal_stop(handle);
937 out:
938 brelse(iloc.bh);
939 return ret;
940 }
941
942 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
943 unsigned len, unsigned copied,
944 struct page *page)
945 {
946 int i_size_changed = 0;
947
948 copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
949
950 /*
951 * No need to use i_size_read() here, the i_size
952 * cannot change under us because we hold i_mutex.
953 *
954 * But it's important to update i_size while still holding page lock:
955 * page writeout could otherwise come in and zero beyond i_size.
956 */
957 if (pos+copied > inode->i_size) {
958 i_size_write(inode, pos+copied);
959 i_size_changed = 1;
960 }
961 unlock_page(page);
962 put_page(page);
963
964 /*
965 * Don't mark the inode dirty under page lock. First, it unnecessarily
966 * makes the holding time of page lock longer. Second, it forces lock
967 * ordering of page lock and transaction start for journaling
968 * filesystems.
969 */
970 if (i_size_changed)
971 mark_inode_dirty(inode);
972
973 return copied;
974 }
975
976 #ifdef INLINE_DIR_DEBUG
977 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
978 void *inline_start, int inline_size)
979 {
980 int offset;
981 unsigned short de_len;
982 struct ext4_dir_entry_2 *de = inline_start;
983 void *dlimit = inline_start + inline_size;
984
985 trace_printk("inode %lu\n", dir->i_ino);
986 offset = 0;
987 while ((void *)de < dlimit) {
988 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
989 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
990 offset, de_len, de->name_len, de->name,
991 de->name_len, le32_to_cpu(de->inode));
992 if (ext4_check_dir_entry(dir, NULL, de, bh,
993 inline_start, inline_size, offset))
994 BUG();
995
996 offset += de_len;
997 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
998 }
999 }
1000 #else
1001 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1002 #endif
1003
1004 /*
1005 * Add a new entry into a inline dir.
1006 * It will return -ENOSPC if no space is available, and -EIO
1007 * and -EEXIST if directory entry already exists.
1008 */
1009 static int ext4_add_dirent_to_inline(handle_t *handle,
1010 struct ext4_filename *fname,
1011 struct inode *dir,
1012 struct inode *inode,
1013 struct ext4_iloc *iloc,
1014 void *inline_start, int inline_size)
1015 {
1016 int err;
1017 struct ext4_dir_entry_2 *de;
1018
1019 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1020 inline_size, fname, &de);
1021 if (err)
1022 return err;
1023
1024 BUFFER_TRACE(iloc->bh, "get_write_access");
1025 err = ext4_journal_get_write_access(handle, iloc->bh);
1026 if (err)
1027 return err;
1028 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1029
1030 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1031
1032 /*
1033 * XXX shouldn't update any times until successful
1034 * completion of syscall, but too many callers depend
1035 * on this.
1036 *
1037 * XXX similarly, too many callers depend on
1038 * ext4_new_inode() setting the times, but error
1039 * recovery deletes the inode, so the worst that can
1040 * happen is that the times are slightly out of date
1041 * and/or different from the directory change time.
1042 */
1043 dir->i_mtime = dir->i_ctime = current_time(dir);
1044 ext4_update_dx_flag(dir);
1045 dir->i_version++;
1046 ext4_mark_inode_dirty(handle, dir);
1047 return 1;
1048 }
1049
1050 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1051 struct ext4_iloc *iloc)
1052 {
1053 struct ext4_xattr_entry *entry;
1054 struct ext4_xattr_ibody_header *header;
1055
1056 BUG_ON(!EXT4_I(inode)->i_inline_off);
1057
1058 header = IHDR(inode, ext4_raw_inode(iloc));
1059 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1060 EXT4_I(inode)->i_inline_off);
1061
1062 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1063 }
1064
1065 /* Set the final de to cover the whole block. */
1066 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1067 {
1068 struct ext4_dir_entry_2 *de, *prev_de;
1069 void *limit;
1070 int de_len;
1071
1072 de = (struct ext4_dir_entry_2 *)de_buf;
1073 if (old_size) {
1074 limit = de_buf + old_size;
1075 do {
1076 prev_de = de;
1077 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1078 de_buf += de_len;
1079 de = (struct ext4_dir_entry_2 *)de_buf;
1080 } while (de_buf < limit);
1081
1082 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1083 old_size, new_size);
1084 } else {
1085 /* this is just created, so create an empty entry. */
1086 de->inode = 0;
1087 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1088 }
1089 }
1090
1091 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1092 struct ext4_iloc *iloc)
1093 {
1094 int ret;
1095 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1096 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1097
1098 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1099 return -ENOSPC;
1100
1101 ret = ext4_update_inline_data(handle, dir,
1102 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1103 if (ret)
1104 return ret;
1105
1106 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1107 EXT4_I(dir)->i_inline_size -
1108 EXT4_MIN_INLINE_DATA_SIZE);
1109 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1110 return 0;
1111 }
1112
1113 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1114 struct ext4_iloc *iloc,
1115 void *buf, int inline_size)
1116 {
1117 ext4_create_inline_data(handle, inode, inline_size);
1118 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1119 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1120 }
1121
1122 static int ext4_finish_convert_inline_dir(handle_t *handle,
1123 struct inode *inode,
1124 struct buffer_head *dir_block,
1125 void *buf,
1126 int inline_size)
1127 {
1128 int err, csum_size = 0, header_size = 0;
1129 struct ext4_dir_entry_2 *de;
1130 struct ext4_dir_entry_tail *t;
1131 void *target = dir_block->b_data;
1132
1133 /*
1134 * First create "." and ".." and then copy the dir information
1135 * back to the block.
1136 */
1137 de = (struct ext4_dir_entry_2 *)target;
1138 de = ext4_init_dot_dotdot(inode, de,
1139 inode->i_sb->s_blocksize, csum_size,
1140 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1141 header_size = (void *)de - target;
1142
1143 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1144 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1145
1146 if (ext4_has_metadata_csum(inode->i_sb))
1147 csum_size = sizeof(struct ext4_dir_entry_tail);
1148
1149 inode->i_size = inode->i_sb->s_blocksize;
1150 i_size_write(inode, inode->i_sb->s_blocksize);
1151 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1152 ext4_update_final_de(dir_block->b_data,
1153 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1154 inode->i_sb->s_blocksize - csum_size);
1155
1156 if (csum_size) {
1157 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1158 inode->i_sb->s_blocksize);
1159 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1160 }
1161 set_buffer_uptodate(dir_block);
1162 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1163 if (err)
1164 goto out;
1165 set_buffer_verified(dir_block);
1166 out:
1167 return err;
1168 }
1169
1170 static int ext4_convert_inline_data_nolock(handle_t *handle,
1171 struct inode *inode,
1172 struct ext4_iloc *iloc)
1173 {
1174 int error;
1175 void *buf = NULL;
1176 struct buffer_head *data_bh = NULL;
1177 struct ext4_map_blocks map;
1178 int inline_size;
1179
1180 inline_size = ext4_get_inline_size(inode);
1181 buf = kmalloc(inline_size, GFP_NOFS);
1182 if (!buf) {
1183 error = -ENOMEM;
1184 goto out;
1185 }
1186
1187 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1188 if (error < 0)
1189 goto out;
1190
1191 /*
1192 * Make sure the inline directory entries pass checks before we try to
1193 * convert them, so that we avoid touching stuff that needs fsck.
1194 */
1195 if (S_ISDIR(inode->i_mode)) {
1196 error = ext4_check_all_de(inode, iloc->bh,
1197 buf + EXT4_INLINE_DOTDOT_SIZE,
1198 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1199 if (error)
1200 goto out;
1201 }
1202
1203 error = ext4_destroy_inline_data_nolock(handle, inode);
1204 if (error)
1205 goto out;
1206
1207 map.m_lblk = 0;
1208 map.m_len = 1;
1209 map.m_flags = 0;
1210 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1211 if (error < 0)
1212 goto out_restore;
1213 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1214 error = -EIO;
1215 goto out_restore;
1216 }
1217
1218 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1219 if (!data_bh) {
1220 error = -ENOMEM;
1221 goto out_restore;
1222 }
1223
1224 lock_buffer(data_bh);
1225 error = ext4_journal_get_create_access(handle, data_bh);
1226 if (error) {
1227 unlock_buffer(data_bh);
1228 error = -EIO;
1229 goto out_restore;
1230 }
1231 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1232
1233 if (!S_ISDIR(inode->i_mode)) {
1234 memcpy(data_bh->b_data, buf, inline_size);
1235 set_buffer_uptodate(data_bh);
1236 error = ext4_handle_dirty_metadata(handle,
1237 inode, data_bh);
1238 } else {
1239 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1240 buf, inline_size);
1241 }
1242
1243 unlock_buffer(data_bh);
1244 out_restore:
1245 if (error)
1246 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1247
1248 out:
1249 brelse(data_bh);
1250 kfree(buf);
1251 return error;
1252 }
1253
1254 /*
1255 * Try to add the new entry to the inline data.
1256 * If succeeds, return 0. If not, extended the inline dir and copied data to
1257 * the new created block.
1258 */
1259 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1260 struct inode *dir, struct inode *inode)
1261 {
1262 int ret, inline_size;
1263 void *inline_start;
1264 struct ext4_iloc iloc;
1265
1266 ret = ext4_get_inode_loc(dir, &iloc);
1267 if (ret)
1268 return ret;
1269
1270 down_write(&EXT4_I(dir)->xattr_sem);
1271 if (!ext4_has_inline_data(dir))
1272 goto out;
1273
1274 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1275 EXT4_INLINE_DOTDOT_SIZE;
1276 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1277
1278 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1279 inline_start, inline_size);
1280 if (ret != -ENOSPC)
1281 goto out;
1282
1283 /* check whether it can be inserted to inline xattr space. */
1284 inline_size = EXT4_I(dir)->i_inline_size -
1285 EXT4_MIN_INLINE_DATA_SIZE;
1286 if (!inline_size) {
1287 /* Try to use the xattr space.*/
1288 ret = ext4_update_inline_dir(handle, dir, &iloc);
1289 if (ret && ret != -ENOSPC)
1290 goto out;
1291
1292 inline_size = EXT4_I(dir)->i_inline_size -
1293 EXT4_MIN_INLINE_DATA_SIZE;
1294 }
1295
1296 if (inline_size) {
1297 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1298
1299 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1300 inode, &iloc, inline_start,
1301 inline_size);
1302
1303 if (ret != -ENOSPC)
1304 goto out;
1305 }
1306
1307 /*
1308 * The inline space is filled up, so create a new block for it.
1309 * As the extent tree will be created, we have to save the inline
1310 * dir first.
1311 */
1312 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1313
1314 out:
1315 ext4_mark_inode_dirty(handle, dir);
1316 up_write(&EXT4_I(dir)->xattr_sem);
1317 brelse(iloc.bh);
1318 return ret;
1319 }
1320
1321 /*
1322 * This function fills a red-black tree with information from an
1323 * inlined dir. It returns the number directory entries loaded
1324 * into the tree. If there is an error it is returned in err.
1325 */
1326 int htree_inlinedir_to_tree(struct file *dir_file,
1327 struct inode *dir, ext4_lblk_t block,
1328 struct dx_hash_info *hinfo,
1329 __u32 start_hash, __u32 start_minor_hash,
1330 int *has_inline_data)
1331 {
1332 int err = 0, count = 0;
1333 unsigned int parent_ino;
1334 int pos;
1335 struct ext4_dir_entry_2 *de;
1336 struct inode *inode = file_inode(dir_file);
1337 int ret, inline_size = 0;
1338 struct ext4_iloc iloc;
1339 void *dir_buf = NULL;
1340 struct ext4_dir_entry_2 fake;
1341 struct fscrypt_str tmp_str;
1342
1343 ret = ext4_get_inode_loc(inode, &iloc);
1344 if (ret)
1345 return ret;
1346
1347 down_read(&EXT4_I(inode)->xattr_sem);
1348 if (!ext4_has_inline_data(inode)) {
1349 up_read(&EXT4_I(inode)->xattr_sem);
1350 *has_inline_data = 0;
1351 goto out;
1352 }
1353
1354 inline_size = ext4_get_inline_size(inode);
1355 dir_buf = kmalloc(inline_size, GFP_NOFS);
1356 if (!dir_buf) {
1357 ret = -ENOMEM;
1358 up_read(&EXT4_I(inode)->xattr_sem);
1359 goto out;
1360 }
1361
1362 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1363 up_read(&EXT4_I(inode)->xattr_sem);
1364 if (ret < 0)
1365 goto out;
1366
1367 pos = 0;
1368 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1369 while (pos < inline_size) {
1370 /*
1371 * As inlined dir doesn't store any information about '.' and
1372 * only the inode number of '..' is stored, we have to handle
1373 * them differently.
1374 */
1375 if (pos == 0) {
1376 fake.inode = cpu_to_le32(inode->i_ino);
1377 fake.name_len = 1;
1378 strcpy(fake.name, ".");
1379 fake.rec_len = ext4_rec_len_to_disk(
1380 EXT4_DIR_REC_LEN(fake.name_len),
1381 inline_size);
1382 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1383 de = &fake;
1384 pos = EXT4_INLINE_DOTDOT_OFFSET;
1385 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1386 fake.inode = cpu_to_le32(parent_ino);
1387 fake.name_len = 2;
1388 strcpy(fake.name, "..");
1389 fake.rec_len = ext4_rec_len_to_disk(
1390 EXT4_DIR_REC_LEN(fake.name_len),
1391 inline_size);
1392 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1393 de = &fake;
1394 pos = EXT4_INLINE_DOTDOT_SIZE;
1395 } else {
1396 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1397 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1398 if (ext4_check_dir_entry(inode, dir_file, de,
1399 iloc.bh, dir_buf,
1400 inline_size, pos)) {
1401 ret = count;
1402 goto out;
1403 }
1404 }
1405
1406 ext4fs_dirhash(de->name, de->name_len, hinfo);
1407 if ((hinfo->hash < start_hash) ||
1408 ((hinfo->hash == start_hash) &&
1409 (hinfo->minor_hash < start_minor_hash)))
1410 continue;
1411 if (de->inode == 0)
1412 continue;
1413 tmp_str.name = de->name;
1414 tmp_str.len = de->name_len;
1415 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1416 hinfo->minor_hash, de, &tmp_str);
1417 if (err) {
1418 count = err;
1419 goto out;
1420 }
1421 count++;
1422 }
1423 ret = count;
1424 out:
1425 kfree(dir_buf);
1426 brelse(iloc.bh);
1427 return ret;
1428 }
1429
1430 /*
1431 * So this function is called when the volume is mkfsed with
1432 * dir_index disabled. In order to keep f_pos persistent
1433 * after we convert from an inlined dir to a blocked based,
1434 * we just pretend that we are a normal dir and return the
1435 * offset as if '.' and '..' really take place.
1436 *
1437 */
1438 int ext4_read_inline_dir(struct file *file,
1439 struct dir_context *ctx,
1440 int *has_inline_data)
1441 {
1442 unsigned int offset, parent_ino;
1443 int i;
1444 struct ext4_dir_entry_2 *de;
1445 struct super_block *sb;
1446 struct inode *inode = file_inode(file);
1447 int ret, inline_size = 0;
1448 struct ext4_iloc iloc;
1449 void *dir_buf = NULL;
1450 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1451
1452 ret = ext4_get_inode_loc(inode, &iloc);
1453 if (ret)
1454 return ret;
1455
1456 down_read(&EXT4_I(inode)->xattr_sem);
1457 if (!ext4_has_inline_data(inode)) {
1458 up_read(&EXT4_I(inode)->xattr_sem);
1459 *has_inline_data = 0;
1460 goto out;
1461 }
1462
1463 inline_size = ext4_get_inline_size(inode);
1464 dir_buf = kmalloc(inline_size, GFP_NOFS);
1465 if (!dir_buf) {
1466 ret = -ENOMEM;
1467 up_read(&EXT4_I(inode)->xattr_sem);
1468 goto out;
1469 }
1470
1471 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1472 up_read(&EXT4_I(inode)->xattr_sem);
1473 if (ret < 0)
1474 goto out;
1475
1476 ret = 0;
1477 sb = inode->i_sb;
1478 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1479 offset = ctx->pos;
1480
1481 /*
1482 * dotdot_offset and dotdot_size is the real offset and
1483 * size for ".." and "." if the dir is block based while
1484 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1485 * So we will use extra_offset and extra_size to indicate them
1486 * during the inline dir iteration.
1487 */
1488 dotdot_offset = EXT4_DIR_REC_LEN(1);
1489 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1490 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1491 extra_size = extra_offset + inline_size;
1492
1493 /*
1494 * If the version has changed since the last call to
1495 * readdir(2), then we might be pointing to an invalid
1496 * dirent right now. Scan from the start of the inline
1497 * dir to make sure.
1498 */
1499 if (file->f_version != inode->i_version) {
1500 for (i = 0; i < extra_size && i < offset;) {
1501 /*
1502 * "." is with offset 0 and
1503 * ".." is dotdot_offset.
1504 */
1505 if (!i) {
1506 i = dotdot_offset;
1507 continue;
1508 } else if (i == dotdot_offset) {
1509 i = dotdot_size;
1510 continue;
1511 }
1512 /* for other entry, the real offset in
1513 * the buf has to be tuned accordingly.
1514 */
1515 de = (struct ext4_dir_entry_2 *)
1516 (dir_buf + i - extra_offset);
1517 /* It's too expensive to do a full
1518 * dirent test each time round this
1519 * loop, but we do have to test at
1520 * least that it is non-zero. A
1521 * failure will be detected in the
1522 * dirent test below. */
1523 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1524 < EXT4_DIR_REC_LEN(1))
1525 break;
1526 i += ext4_rec_len_from_disk(de->rec_len,
1527 extra_size);
1528 }
1529 offset = i;
1530 ctx->pos = offset;
1531 file->f_version = inode->i_version;
1532 }
1533
1534 while (ctx->pos < extra_size) {
1535 if (ctx->pos == 0) {
1536 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1537 goto out;
1538 ctx->pos = dotdot_offset;
1539 continue;
1540 }
1541
1542 if (ctx->pos == dotdot_offset) {
1543 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1544 goto out;
1545 ctx->pos = dotdot_size;
1546 continue;
1547 }
1548
1549 de = (struct ext4_dir_entry_2 *)
1550 (dir_buf + ctx->pos - extra_offset);
1551 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1552 extra_size, ctx->pos))
1553 goto out;
1554 if (le32_to_cpu(de->inode)) {
1555 if (!dir_emit(ctx, de->name, de->name_len,
1556 le32_to_cpu(de->inode),
1557 get_dtype(sb, de->file_type)))
1558 goto out;
1559 }
1560 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1561 }
1562 out:
1563 kfree(dir_buf);
1564 brelse(iloc.bh);
1565 return ret;
1566 }
1567
1568 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1569 struct ext4_dir_entry_2 **parent_de,
1570 int *retval)
1571 {
1572 struct ext4_iloc iloc;
1573
1574 *retval = ext4_get_inode_loc(inode, &iloc);
1575 if (*retval)
1576 return NULL;
1577
1578 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1579
1580 return iloc.bh;
1581 }
1582
1583 /*
1584 * Try to create the inline data for the new dir.
1585 * If it succeeds, return 0, otherwise return the error.
1586 * In case of ENOSPC, the caller should create the normal disk layout dir.
1587 */
1588 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1589 struct inode *inode)
1590 {
1591 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1592 struct ext4_iloc iloc;
1593 struct ext4_dir_entry_2 *de;
1594
1595 ret = ext4_get_inode_loc(inode, &iloc);
1596 if (ret)
1597 return ret;
1598
1599 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1600 if (ret)
1601 goto out;
1602
1603 /*
1604 * For inline dir, we only save the inode information for the ".."
1605 * and create a fake dentry to cover the left space.
1606 */
1607 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1608 de->inode = cpu_to_le32(parent->i_ino);
1609 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1610 de->inode = 0;
1611 de->rec_len = ext4_rec_len_to_disk(
1612 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1613 inline_size);
1614 set_nlink(inode, 2);
1615 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1616 out:
1617 brelse(iloc.bh);
1618 return ret;
1619 }
1620
1621 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1622 struct ext4_filename *fname,
1623 const struct qstr *d_name,
1624 struct ext4_dir_entry_2 **res_dir,
1625 int *has_inline_data)
1626 {
1627 int ret;
1628 struct ext4_iloc iloc;
1629 void *inline_start;
1630 int inline_size;
1631
1632 if (ext4_get_inode_loc(dir, &iloc))
1633 return NULL;
1634
1635 down_read(&EXT4_I(dir)->xattr_sem);
1636 if (!ext4_has_inline_data(dir)) {
1637 *has_inline_data = 0;
1638 goto out;
1639 }
1640
1641 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1642 EXT4_INLINE_DOTDOT_SIZE;
1643 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1644 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1645 dir, fname, d_name, 0, res_dir);
1646 if (ret == 1)
1647 goto out_find;
1648 if (ret < 0)
1649 goto out;
1650
1651 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1652 goto out;
1653
1654 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1655 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1656
1657 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1658 dir, fname, d_name, 0, res_dir);
1659 if (ret == 1)
1660 goto out_find;
1661
1662 out:
1663 brelse(iloc.bh);
1664 iloc.bh = NULL;
1665 out_find:
1666 up_read(&EXT4_I(dir)->xattr_sem);
1667 return iloc.bh;
1668 }
1669
1670 int ext4_delete_inline_entry(handle_t *handle,
1671 struct inode *dir,
1672 struct ext4_dir_entry_2 *de_del,
1673 struct buffer_head *bh,
1674 int *has_inline_data)
1675 {
1676 int err, inline_size;
1677 struct ext4_iloc iloc;
1678 void *inline_start;
1679
1680 err = ext4_get_inode_loc(dir, &iloc);
1681 if (err)
1682 return err;
1683
1684 down_write(&EXT4_I(dir)->xattr_sem);
1685 if (!ext4_has_inline_data(dir)) {
1686 *has_inline_data = 0;
1687 goto out;
1688 }
1689
1690 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1691 EXT4_MIN_INLINE_DATA_SIZE) {
1692 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1693 EXT4_INLINE_DOTDOT_SIZE;
1694 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1695 EXT4_INLINE_DOTDOT_SIZE;
1696 } else {
1697 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1698 inline_size = ext4_get_inline_size(dir) -
1699 EXT4_MIN_INLINE_DATA_SIZE;
1700 }
1701
1702 BUFFER_TRACE(bh, "get_write_access");
1703 err = ext4_journal_get_write_access(handle, bh);
1704 if (err)
1705 goto out;
1706
1707 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1708 inline_start, inline_size, 0);
1709 if (err)
1710 goto out;
1711
1712 err = ext4_mark_inode_dirty(handle, dir);
1713 if (unlikely(err))
1714 goto out;
1715
1716 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1717 out:
1718 up_write(&EXT4_I(dir)->xattr_sem);
1719 brelse(iloc.bh);
1720 if (err != -ENOENT)
1721 ext4_std_error(dir->i_sb, err);
1722 return err;
1723 }
1724
1725 /*
1726 * Get the inline dentry at offset.
1727 */
1728 static inline struct ext4_dir_entry_2 *
1729 ext4_get_inline_entry(struct inode *inode,
1730 struct ext4_iloc *iloc,
1731 unsigned int offset,
1732 void **inline_start,
1733 int *inline_size)
1734 {
1735 void *inline_pos;
1736
1737 BUG_ON(offset > ext4_get_inline_size(inode));
1738
1739 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1740 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1741 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1742 } else {
1743 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1744 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1745 *inline_size = ext4_get_inline_size(inode) -
1746 EXT4_MIN_INLINE_DATA_SIZE;
1747 }
1748
1749 if (inline_start)
1750 *inline_start = inline_pos;
1751 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1752 }
1753
1754 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1755 {
1756 int err, inline_size;
1757 struct ext4_iloc iloc;
1758 void *inline_pos;
1759 unsigned int offset;
1760 struct ext4_dir_entry_2 *de;
1761 bool ret = true;
1762
1763 err = ext4_get_inode_loc(dir, &iloc);
1764 if (err) {
1765 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1766 err, dir->i_ino);
1767 return true;
1768 }
1769
1770 down_read(&EXT4_I(dir)->xattr_sem);
1771 if (!ext4_has_inline_data(dir)) {
1772 *has_inline_data = 0;
1773 goto out;
1774 }
1775
1776 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1777 if (!le32_to_cpu(de->inode)) {
1778 ext4_warning(dir->i_sb,
1779 "bad inline directory (dir #%lu) - no `..'",
1780 dir->i_ino);
1781 ret = true;
1782 goto out;
1783 }
1784
1785 offset = EXT4_INLINE_DOTDOT_SIZE;
1786 while (offset < dir->i_size) {
1787 de = ext4_get_inline_entry(dir, &iloc, offset,
1788 &inline_pos, &inline_size);
1789 if (ext4_check_dir_entry(dir, NULL, de,
1790 iloc.bh, inline_pos,
1791 inline_size, offset)) {
1792 ext4_warning(dir->i_sb,
1793 "bad inline directory (dir #%lu) - "
1794 "inode %u, rec_len %u, name_len %d"
1795 "inline size %d",
1796 dir->i_ino, le32_to_cpu(de->inode),
1797 le16_to_cpu(de->rec_len), de->name_len,
1798 inline_size);
1799 ret = true;
1800 goto out;
1801 }
1802 if (le32_to_cpu(de->inode)) {
1803 ret = false;
1804 goto out;
1805 }
1806 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1807 }
1808
1809 out:
1810 up_read(&EXT4_I(dir)->xattr_sem);
1811 brelse(iloc.bh);
1812 return ret;
1813 }
1814
1815 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1816 {
1817 int ret;
1818
1819 down_write(&EXT4_I(inode)->xattr_sem);
1820 ret = ext4_destroy_inline_data_nolock(handle, inode);
1821 up_write(&EXT4_I(inode)->xattr_sem);
1822
1823 return ret;
1824 }
1825
1826 int ext4_inline_data_fiemap(struct inode *inode,
1827 struct fiemap_extent_info *fieinfo,
1828 int *has_inline, __u64 start, __u64 len)
1829 {
1830 __u64 physical = 0;
1831 __u64 inline_len;
1832 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1833 FIEMAP_EXTENT_LAST;
1834 int error = 0;
1835 struct ext4_iloc iloc;
1836
1837 down_read(&EXT4_I(inode)->xattr_sem);
1838 if (!ext4_has_inline_data(inode)) {
1839 *has_inline = 0;
1840 goto out;
1841 }
1842 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1843 i_size_read(inode));
1844 if (start >= inline_len)
1845 goto out;
1846 if (start + len < inline_len)
1847 inline_len = start + len;
1848 inline_len -= start;
1849
1850 error = ext4_get_inode_loc(inode, &iloc);
1851 if (error)
1852 goto out;
1853
1854 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1855 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1856 physical += offsetof(struct ext4_inode, i_block);
1857
1858 if (physical)
1859 error = fiemap_fill_next_extent(fieinfo, start, physical,
1860 inline_len, flags);
1861 brelse(iloc.bh);
1862 out:
1863 up_read(&EXT4_I(inode)->xattr_sem);
1864 return (error < 0 ? error : 0);
1865 }
1866
1867 /*
1868 * Called during xattr set, and if we can sparse space 'needed',
1869 * just create the extent tree evict the data to the outer block.
1870 *
1871 * We use jbd2 instead of page cache to move data to the 1st block
1872 * so that the whole transaction can be committed as a whole and
1873 * the data isn't lost because of the delayed page cache write.
1874 */
1875 int ext4_try_to_evict_inline_data(handle_t *handle,
1876 struct inode *inode,
1877 int needed)
1878 {
1879 int error;
1880 struct ext4_xattr_entry *entry;
1881 struct ext4_inode *raw_inode;
1882 struct ext4_iloc iloc;
1883
1884 error = ext4_get_inode_loc(inode, &iloc);
1885 if (error)
1886 return error;
1887
1888 raw_inode = ext4_raw_inode(&iloc);
1889 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1890 EXT4_I(inode)->i_inline_off);
1891 if (EXT4_XATTR_LEN(entry->e_name_len) +
1892 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1893 error = -ENOSPC;
1894 goto out;
1895 }
1896
1897 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1898 out:
1899 brelse(iloc.bh);
1900 return error;
1901 }
1902
1903 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1904 {
1905 handle_t *handle;
1906 int inline_size, value_len, needed_blocks;
1907 size_t i_size;
1908 void *value = NULL;
1909 struct ext4_xattr_ibody_find is = {
1910 .s = { .not_found = -ENODATA, },
1911 };
1912 struct ext4_xattr_info i = {
1913 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1914 .name = EXT4_XATTR_SYSTEM_DATA,
1915 };
1916
1917
1918 needed_blocks = ext4_writepage_trans_blocks(inode);
1919 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1920 if (IS_ERR(handle))
1921 return;
1922
1923 down_write(&EXT4_I(inode)->xattr_sem);
1924 if (!ext4_has_inline_data(inode)) {
1925 *has_inline = 0;
1926 ext4_journal_stop(handle);
1927 return;
1928 }
1929
1930 if (ext4_orphan_add(handle, inode))
1931 goto out;
1932
1933 if (ext4_get_inode_loc(inode, &is.iloc))
1934 goto out;
1935
1936 down_write(&EXT4_I(inode)->i_data_sem);
1937 i_size = inode->i_size;
1938 inline_size = ext4_get_inline_size(inode);
1939 EXT4_I(inode)->i_disksize = i_size;
1940
1941 if (i_size < inline_size) {
1942 /* Clear the content in the xattr space. */
1943 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1944 if (ext4_xattr_ibody_find(inode, &i, &is))
1945 goto out_error;
1946
1947 BUG_ON(is.s.not_found);
1948
1949 value_len = le32_to_cpu(is.s.here->e_value_size);
1950 value = kmalloc(value_len, GFP_NOFS);
1951 if (!value)
1952 goto out_error;
1953
1954 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1955 value, value_len))
1956 goto out_error;
1957
1958 i.value = value;
1959 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1960 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1961 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1962 goto out_error;
1963 }
1964
1965 /* Clear the content within i_blocks. */
1966 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1967 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1968 memset(p + i_size, 0,
1969 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1970 }
1971
1972 EXT4_I(inode)->i_inline_size = i_size <
1973 EXT4_MIN_INLINE_DATA_SIZE ?
1974 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1975 }
1976
1977 out_error:
1978 up_write(&EXT4_I(inode)->i_data_sem);
1979 out:
1980 brelse(is.iloc.bh);
1981 up_write(&EXT4_I(inode)->xattr_sem);
1982 kfree(value);
1983 if (inode->i_nlink)
1984 ext4_orphan_del(handle, inode);
1985
1986 inode->i_mtime = inode->i_ctime = current_time(inode);
1987 ext4_mark_inode_dirty(handle, inode);
1988 if (IS_SYNC(inode))
1989 ext4_handle_sync(handle);
1990
1991 ext4_journal_stop(handle);
1992 return;
1993 }
1994
1995 int ext4_convert_inline_data(struct inode *inode)
1996 {
1997 int error, needed_blocks;
1998 handle_t *handle;
1999 struct ext4_iloc iloc;
2000
2001 if (!ext4_has_inline_data(inode)) {
2002 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2003 return 0;
2004 }
2005
2006 needed_blocks = ext4_writepage_trans_blocks(inode);
2007
2008 iloc.bh = NULL;
2009 error = ext4_get_inode_loc(inode, &iloc);
2010 if (error)
2011 return error;
2012
2013 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2014 if (IS_ERR(handle)) {
2015 error = PTR_ERR(handle);
2016 goto out_free;
2017 }
2018
2019 down_write(&EXT4_I(inode)->xattr_sem);
2020 if (!ext4_has_inline_data(inode)) {
2021 up_write(&EXT4_I(inode)->xattr_sem);
2022 goto out;
2023 }
2024
2025 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2026 up_write(&EXT4_I(inode)->xattr_sem);
2027 out:
2028 ext4_journal_stop(handle);
2029 out_free:
2030 brelse(iloc.bh);
2031 return error;
2032 }
Linux with added FPC-III support