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Linux 4.2.6
[linux/fpc-iii.git] / fs / ext4 / inline.c
blobcd944a7a99cdcf0d5f53c7823003f3f6d7df6667
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 get_bh(is.iloc.bh);
303 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
304
305 out:
306 brelse(is.iloc.bh);
307 return error;
308 }
309
310 static 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
368 out:
369 kfree(value);
370 brelse(is.iloc.bh);
371 return error;
372 }
373
374 static 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
399 static 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_INCOMPAT_FEATURE(inode->i_sb,
438 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
439 if (S_ISDIR(inode->i_mode) ||
440 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
441 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
442 ext4_ext_tree_init(handle, inode);
443 }
444 }
445 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
446
447 get_bh(is.iloc.bh);
448 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
449
450 EXT4_I(inode)->i_inline_off = 0;
451 EXT4_I(inode)->i_inline_size = 0;
452 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
453 out:
454 brelse(is.iloc.bh);
455 if (error == -ENODATA)
456 error = 0;
457 return error;
458 }
459
460 static int ext4_read_inline_page(struct inode *inode, struct page *page)
461 {
462 void *kaddr;
463 int ret = 0;
464 size_t len;
465 struct ext4_iloc iloc;
466
467 BUG_ON(!PageLocked(page));
468 BUG_ON(!ext4_has_inline_data(inode));
469 BUG_ON(page->index);
470
471 if (!EXT4_I(inode)->i_inline_off) {
472 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
473 inode->i_ino);
474 goto out;
475 }
476
477 ret = ext4_get_inode_loc(inode, &iloc);
478 if (ret)
479 goto out;
480
481 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
482 kaddr = kmap_atomic(page);
483 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
484 flush_dcache_page(page);
485 kunmap_atomic(kaddr);
486 zero_user_segment(page, len, PAGE_CACHE_SIZE);
487 SetPageUptodate(page);
488 brelse(iloc.bh);
489
490 out:
491 return ret;
492 }
493
494 int ext4_readpage_inline(struct inode *inode, struct page *page)
495 {
496 int ret = 0;
497
498 down_read(&EXT4_I(inode)->xattr_sem);
499 if (!ext4_has_inline_data(inode)) {
500 up_read(&EXT4_I(inode)->xattr_sem);
501 return -EAGAIN;
502 }
503
504 /*
505 * Current inline data can only exist in the 1st page,
506 * So for all the other pages, just set them uptodate.
507 */
508 if (!page->index)
509 ret = ext4_read_inline_page(inode, page);
510 else if (!PageUptodate(page)) {
511 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
512 SetPageUptodate(page);
513 }
514
515 up_read(&EXT4_I(inode)->xattr_sem);
516
517 unlock_page(page);
518 return ret >= 0 ? 0 : ret;
519 }
520
521 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
522 struct inode *inode,
523 unsigned flags)
524 {
525 int ret, needed_blocks;
526 handle_t *handle = NULL;
527 int retries = 0, sem_held = 0;
528 struct page *page = NULL;
529 unsigned from, to;
530 struct ext4_iloc iloc;
531
532 if (!ext4_has_inline_data(inode)) {
533 /*
534 * clear the flag so that no new write
535 * will trap here again.
536 */
537 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
538 return 0;
539 }
540
541 needed_blocks = ext4_writepage_trans_blocks(inode);
542
543 ret = ext4_get_inode_loc(inode, &iloc);
544 if (ret)
545 return ret;
546
547 retry:
548 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
549 if (IS_ERR(handle)) {
550 ret = PTR_ERR(handle);
551 handle = NULL;
552 goto out;
553 }
554
555 /* We cannot recurse into the filesystem as the transaction is already
556 * started */
557 flags |= AOP_FLAG_NOFS;
558
559 page = grab_cache_page_write_begin(mapping, 0, flags);
560 if (!page) {
561 ret = -ENOMEM;
562 goto out;
563 }
564
565 down_write(&EXT4_I(inode)->xattr_sem);
566 sem_held = 1;
567 /* If some one has already done this for us, just exit. */
568 if (!ext4_has_inline_data(inode)) {
569 ret = 0;
570 goto out;
571 }
572
573 from = 0;
574 to = ext4_get_inline_size(inode);
575 if (!PageUptodate(page)) {
576 ret = ext4_read_inline_page(inode, page);
577 if (ret < 0)
578 goto out;
579 }
580
581 ret = ext4_destroy_inline_data_nolock(handle, inode);
582 if (ret)
583 goto out;
584
585 if (ext4_should_dioread_nolock(inode))
586 ret = __block_write_begin(page, from, to, ext4_get_block_write);
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 page_cache_release(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);
621 out:
622 if (page) {
623 unlock_page(page);
624 page_cache_release(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 */
640 int 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 page_cache_release(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;
705 out_up_read:
706 up_read(&EXT4_I(inode)->xattr_sem);
707 out:
708 if (handle)
709 ext4_journal_stop(handle);
710 brelse(iloc.bh);
711 return ret;
712 convert:
713 return ext4_convert_inline_data_to_extent(mapping,
714 inode, flags);
715 }
716
717 int 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);
750 out:
751 return copied;
752 }
753
754 struct buffer_head *
755 ext4_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 */
787 static 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 page_cache_release(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
828 out:
829 up_read(&EXT4_I(inode)->xattr_sem);
830 if (page) {
831 unlock_page(page);
832 page_cache_release(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 */
845 int 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
862 retry_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;
919 out_release_page:
920 up_read(&EXT4_I(inode)->xattr_sem);
921 unlock_page(page);
922 page_cache_release(page);
923 out_journal:
924 ext4_journal_stop(handle);
925 out:
926 brelse(iloc.bh);
927 return ret;
928 }
929
930 int 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 page_cache_release(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
965 void 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 */
997 static int ext4_add_dirent_to_inline(handle_t *handle,
998 struct ext4_filename *fname,
999 struct dentry *dentry,
1000 struct inode *inode,
1001 struct ext4_iloc *iloc,
1002 void *inline_start, int inline_size)
1003 {
1004 struct inode *dir = d_inode(dentry->d_parent);
1005 int err;
1006 struct ext4_dir_entry_2 *de;
1007
1008 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1009 inline_size, fname, &de);
1010 if (err)
1011 return err;
1012
1013 BUFFER_TRACE(iloc->bh, "get_write_access");
1014 err = ext4_journal_get_write_access(handle, iloc->bh);
1015 if (err)
1016 return err;
1017 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1018
1019 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1020
1021 /*
1022 * XXX shouldn't update any times until successful
1023 * completion of syscall, but too many callers depend
1024 * on this.
1025 *
1026 * XXX similarly, too many callers depend on
1027 * ext4_new_inode() setting the times, but error
1028 * recovery deletes the inode, so the worst that can
1029 * happen is that the times are slightly out of date
1030 * and/or different from the directory change time.
1031 */
1032 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1033 ext4_update_dx_flag(dir);
1034 dir->i_version++;
1035 ext4_mark_inode_dirty(handle, dir);
1036 return 1;
1037 }
1038
1039 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1040 struct ext4_iloc *iloc)
1041 {
1042 struct ext4_xattr_entry *entry;
1043 struct ext4_xattr_ibody_header *header;
1044
1045 BUG_ON(!EXT4_I(inode)->i_inline_off);
1046
1047 header = IHDR(inode, ext4_raw_inode(iloc));
1048 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1049 EXT4_I(inode)->i_inline_off);
1050
1051 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1052 }
1053
1054 /* Set the final de to cover the whole block. */
1055 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1056 {
1057 struct ext4_dir_entry_2 *de, *prev_de;
1058 void *limit;
1059 int de_len;
1060
1061 de = (struct ext4_dir_entry_2 *)de_buf;
1062 if (old_size) {
1063 limit = de_buf + old_size;
1064 do {
1065 prev_de = de;
1066 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1067 de_buf += de_len;
1068 de = (struct ext4_dir_entry_2 *)de_buf;
1069 } while (de_buf < limit);
1070
1071 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1072 old_size, new_size);
1073 } else {
1074 /* this is just created, so create an empty entry. */
1075 de->inode = 0;
1076 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1077 }
1078 }
1079
1080 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1081 struct ext4_iloc *iloc)
1082 {
1083 int ret;
1084 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1085 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1086
1087 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1088 return -ENOSPC;
1089
1090 ret = ext4_update_inline_data(handle, dir,
1091 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1092 if (ret)
1093 return ret;
1094
1095 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1096 EXT4_I(dir)->i_inline_size -
1097 EXT4_MIN_INLINE_DATA_SIZE);
1098 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1099 return 0;
1100 }
1101
1102 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1103 struct ext4_iloc *iloc,
1104 void *buf, int inline_size)
1105 {
1106 ext4_create_inline_data(handle, inode, inline_size);
1107 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1108 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1109 }
1110
1111 static int ext4_finish_convert_inline_dir(handle_t *handle,
1112 struct inode *inode,
1113 struct buffer_head *dir_block,
1114 void *buf,
1115 int inline_size)
1116 {
1117 int err, csum_size = 0, header_size = 0;
1118 struct ext4_dir_entry_2 *de;
1119 struct ext4_dir_entry_tail *t;
1120 void *target = dir_block->b_data;
1121
1122 /*
1123 * First create "." and ".." and then copy the dir information
1124 * back to the block.
1125 */
1126 de = (struct ext4_dir_entry_2 *)target;
1127 de = ext4_init_dot_dotdot(inode, de,
1128 inode->i_sb->s_blocksize, csum_size,
1129 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1130 header_size = (void *)de - target;
1131
1132 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1133 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1134
1135 if (ext4_has_metadata_csum(inode->i_sb))
1136 csum_size = sizeof(struct ext4_dir_entry_tail);
1137
1138 inode->i_size = inode->i_sb->s_blocksize;
1139 i_size_write(inode, inode->i_sb->s_blocksize);
1140 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1141 ext4_update_final_de(dir_block->b_data,
1142 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1143 inode->i_sb->s_blocksize - csum_size);
1144
1145 if (csum_size) {
1146 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1147 inode->i_sb->s_blocksize);
1148 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1149 }
1150 set_buffer_uptodate(dir_block);
1151 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1152 if (err)
1153 goto out;
1154 set_buffer_verified(dir_block);
1155 out:
1156 return err;
1157 }
1158
1159 static int ext4_convert_inline_data_nolock(handle_t *handle,
1160 struct inode *inode,
1161 struct ext4_iloc *iloc)
1162 {
1163 int error;
1164 void *buf = NULL;
1165 struct buffer_head *data_bh = NULL;
1166 struct ext4_map_blocks map;
1167 int inline_size;
1168
1169 inline_size = ext4_get_inline_size(inode);
1170 buf = kmalloc(inline_size, GFP_NOFS);
1171 if (!buf) {
1172 error = -ENOMEM;
1173 goto out;
1174 }
1175
1176 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1177 if (error < 0)
1178 goto out;
1179
1180 /*
1181 * Make sure the inline directory entries pass checks before we try to
1182 * convert them, so that we avoid touching stuff that needs fsck.
1183 */
1184 if (S_ISDIR(inode->i_mode)) {
1185 error = ext4_check_all_de(inode, iloc->bh,
1186 buf + EXT4_INLINE_DOTDOT_SIZE,
1187 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1188 if (error)
1189 goto out;
1190 }
1191
1192 error = ext4_destroy_inline_data_nolock(handle, inode);
1193 if (error)
1194 goto out;
1195
1196 map.m_lblk = 0;
1197 map.m_len = 1;
1198 map.m_flags = 0;
1199 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1200 if (error < 0)
1201 goto out_restore;
1202 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1203 error = -EIO;
1204 goto out_restore;
1205 }
1206
1207 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1208 if (!data_bh) {
1209 error = -ENOMEM;
1210 goto out_restore;
1211 }
1212
1213 lock_buffer(data_bh);
1214 error = ext4_journal_get_create_access(handle, data_bh);
1215 if (error) {
1216 unlock_buffer(data_bh);
1217 error = -EIO;
1218 goto out_restore;
1219 }
1220 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1221
1222 if (!S_ISDIR(inode->i_mode)) {
1223 memcpy(data_bh->b_data, buf, inline_size);
1224 set_buffer_uptodate(data_bh);
1225 error = ext4_handle_dirty_metadata(handle,
1226 inode, data_bh);
1227 } else {
1228 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1229 buf, inline_size);
1230 }
1231
1232 unlock_buffer(data_bh);
1233 out_restore:
1234 if (error)
1235 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1236
1237 out:
1238 brelse(data_bh);
1239 kfree(buf);
1240 return error;
1241 }
1242
1243 /*
1244 * Try to add the new entry to the inline data.
1245 * If succeeds, return 0. If not, extended the inline dir and copied data to
1246 * the new created block.
1247 */
1248 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1249 struct dentry *dentry, struct inode *inode)
1250 {
1251 int ret, inline_size;
1252 void *inline_start;
1253 struct ext4_iloc iloc;
1254 struct inode *dir = d_inode(dentry->d_parent);
1255
1256 ret = ext4_get_inode_loc(dir, &iloc);
1257 if (ret)
1258 return ret;
1259
1260 down_write(&EXT4_I(dir)->xattr_sem);
1261 if (!ext4_has_inline_data(dir))
1262 goto out;
1263
1264 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1265 EXT4_INLINE_DOTDOT_SIZE;
1266 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1267
1268 ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
1269 inline_start, inline_size);
1270 if (ret != -ENOSPC)
1271 goto out;
1272
1273 /* check whether it can be inserted to inline xattr space. */
1274 inline_size = EXT4_I(dir)->i_inline_size -
1275 EXT4_MIN_INLINE_DATA_SIZE;
1276 if (!inline_size) {
1277 /* Try to use the xattr space.*/
1278 ret = ext4_update_inline_dir(handle, dir, &iloc);
1279 if (ret && ret != -ENOSPC)
1280 goto out;
1281
1282 inline_size = EXT4_I(dir)->i_inline_size -
1283 EXT4_MIN_INLINE_DATA_SIZE;
1284 }
1285
1286 if (inline_size) {
1287 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1288
1289 ret = ext4_add_dirent_to_inline(handle, fname, dentry,
1290 inode, &iloc, inline_start,
1291 inline_size);
1292
1293 if (ret != -ENOSPC)
1294 goto out;
1295 }
1296
1297 /*
1298 * The inline space is filled up, so create a new block for it.
1299 * As the extent tree will be created, we have to save the inline
1300 * dir first.
1301 */
1302 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1303
1304 out:
1305 ext4_mark_inode_dirty(handle, dir);
1306 up_write(&EXT4_I(dir)->xattr_sem);
1307 brelse(iloc.bh);
1308 return ret;
1309 }
1310
1311 /*
1312 * This function fills a red-black tree with information from an
1313 * inlined dir. It returns the number directory entries loaded
1314 * into the tree. If there is an error it is returned in err.
1315 */
1316 int htree_inlinedir_to_tree(struct file *dir_file,
1317 struct inode *dir, ext4_lblk_t block,
1318 struct dx_hash_info *hinfo,
1319 __u32 start_hash, __u32 start_minor_hash,
1320 int *has_inline_data)
1321 {
1322 int err = 0, count = 0;
1323 unsigned int parent_ino;
1324 int pos;
1325 struct ext4_dir_entry_2 *de;
1326 struct inode *inode = file_inode(dir_file);
1327 int ret, inline_size = 0;
1328 struct ext4_iloc iloc;
1329 void *dir_buf = NULL;
1330 struct ext4_dir_entry_2 fake;
1331 struct ext4_str tmp_str;
1332
1333 ret = ext4_get_inode_loc(inode, &iloc);
1334 if (ret)
1335 return ret;
1336
1337 down_read(&EXT4_I(inode)->xattr_sem);
1338 if (!ext4_has_inline_data(inode)) {
1339 up_read(&EXT4_I(inode)->xattr_sem);
1340 *has_inline_data = 0;
1341 goto out;
1342 }
1343
1344 inline_size = ext4_get_inline_size(inode);
1345 dir_buf = kmalloc(inline_size, GFP_NOFS);
1346 if (!dir_buf) {
1347 ret = -ENOMEM;
1348 up_read(&EXT4_I(inode)->xattr_sem);
1349 goto out;
1350 }
1351
1352 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1353 up_read(&EXT4_I(inode)->xattr_sem);
1354 if (ret < 0)
1355 goto out;
1356
1357 pos = 0;
1358 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1359 while (pos < inline_size) {
1360 /*
1361 * As inlined dir doesn't store any information about '.' and
1362 * only the inode number of '..' is stored, we have to handle
1363 * them differently.
1364 */
1365 if (pos == 0) {
1366 fake.inode = cpu_to_le32(inode->i_ino);
1367 fake.name_len = 1;
1368 strcpy(fake.name, ".");
1369 fake.rec_len = ext4_rec_len_to_disk(
1370 EXT4_DIR_REC_LEN(fake.name_len),
1371 inline_size);
1372 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1373 de = &fake;
1374 pos = EXT4_INLINE_DOTDOT_OFFSET;
1375 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1376 fake.inode = cpu_to_le32(parent_ino);
1377 fake.name_len = 2;
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_SIZE;
1385 } else {
1386 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1387 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1388 if (ext4_check_dir_entry(inode, dir_file, de,
1389 iloc.bh, dir_buf,
1390 inline_size, pos)) {
1391 ret = count;
1392 goto out;
1393 }
1394 }
1395
1396 ext4fs_dirhash(de->name, de->name_len, hinfo);
1397 if ((hinfo->hash < start_hash) ||
1398 ((hinfo->hash == start_hash) &&
1399 (hinfo->minor_hash < start_minor_hash)))
1400 continue;
1401 if (de->inode == 0)
1402 continue;
1403 tmp_str.name = de->name;
1404 tmp_str.len = de->name_len;
1405 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1406 hinfo->minor_hash, de, &tmp_str);
1407 if (err) {
1408 count = err;
1409 goto out;
1410 }
1411 count++;
1412 }
1413 ret = count;
1414 out:
1415 kfree(dir_buf);
1416 brelse(iloc.bh);
1417 return ret;
1418 }
1419
1420 /*
1421 * So this function is called when the volume is mkfsed with
1422 * dir_index disabled. In order to keep f_pos persistent
1423 * after we convert from an inlined dir to a blocked based,
1424 * we just pretend that we are a normal dir and return the
1425 * offset as if '.' and '..' really take place.
1426 *
1427 */
1428 int ext4_read_inline_dir(struct file *file,
1429 struct dir_context *ctx,
1430 int *has_inline_data)
1431 {
1432 unsigned int offset, parent_ino;
1433 int i;
1434 struct ext4_dir_entry_2 *de;
1435 struct super_block *sb;
1436 struct inode *inode = file_inode(file);
1437 int ret, inline_size = 0;
1438 struct ext4_iloc iloc;
1439 void *dir_buf = NULL;
1440 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1441
1442 ret = ext4_get_inode_loc(inode, &iloc);
1443 if (ret)
1444 return ret;
1445
1446 down_read(&EXT4_I(inode)->xattr_sem);
1447 if (!ext4_has_inline_data(inode)) {
1448 up_read(&EXT4_I(inode)->xattr_sem);
1449 *has_inline_data = 0;
1450 goto out;
1451 }
1452
1453 inline_size = ext4_get_inline_size(inode);
1454 dir_buf = kmalloc(inline_size, GFP_NOFS);
1455 if (!dir_buf) {
1456 ret = -ENOMEM;
1457 up_read(&EXT4_I(inode)->xattr_sem);
1458 goto out;
1459 }
1460
1461 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1462 up_read(&EXT4_I(inode)->xattr_sem);
1463 if (ret < 0)
1464 goto out;
1465
1466 ret = 0;
1467 sb = inode->i_sb;
1468 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1469 offset = ctx->pos;
1470
1471 /*
1472 * dotdot_offset and dotdot_size is the real offset and
1473 * size for ".." and "." if the dir is block based while
1474 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1475 * So we will use extra_offset and extra_size to indicate them
1476 * during the inline dir iteration.
1477 */
1478 dotdot_offset = EXT4_DIR_REC_LEN(1);
1479 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1480 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1481 extra_size = extra_offset + inline_size;
1482
1483 /*
1484 * If the version has changed since the last call to
1485 * readdir(2), then we might be pointing to an invalid
1486 * dirent right now. Scan from the start of the inline
1487 * dir to make sure.
1488 */
1489 if (file->f_version != inode->i_version) {
1490 for (i = 0; i < extra_size && i < offset;) {
1491 /*
1492 * "." is with offset 0 and
1493 * ".." is dotdot_offset.
1494 */
1495 if (!i) {
1496 i = dotdot_offset;
1497 continue;
1498 } else if (i == dotdot_offset) {
1499 i = dotdot_size;
1500 continue;
1501 }
1502 /* for other entry, the real offset in
1503 * the buf has to be tuned accordingly.
1504 */
1505 de = (struct ext4_dir_entry_2 *)
1506 (dir_buf + i - extra_offset);
1507 /* It's too expensive to do a full
1508 * dirent test each time round this
1509 * loop, but we do have to test at
1510 * least that it is non-zero. A
1511 * failure will be detected in the
1512 * dirent test below. */
1513 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1514 < EXT4_DIR_REC_LEN(1))
1515 break;
1516 i += ext4_rec_len_from_disk(de->rec_len,
1517 extra_size);
1518 }
1519 offset = i;
1520 ctx->pos = offset;
1521 file->f_version = inode->i_version;
1522 }
1523
1524 while (ctx->pos < extra_size) {
1525 if (ctx->pos == 0) {
1526 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1527 goto out;
1528 ctx->pos = dotdot_offset;
1529 continue;
1530 }
1531
1532 if (ctx->pos == dotdot_offset) {
1533 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1534 goto out;
1535 ctx->pos = dotdot_size;
1536 continue;
1537 }
1538
1539 de = (struct ext4_dir_entry_2 *)
1540 (dir_buf + ctx->pos - extra_offset);
1541 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1542 extra_size, ctx->pos))
1543 goto out;
1544 if (le32_to_cpu(de->inode)) {
1545 if (!dir_emit(ctx, de->name, de->name_len,
1546 le32_to_cpu(de->inode),
1547 get_dtype(sb, de->file_type)))
1548 goto out;
1549 }
1550 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1551 }
1552 out:
1553 kfree(dir_buf);
1554 brelse(iloc.bh);
1555 return ret;
1556 }
1557
1558 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1559 struct ext4_dir_entry_2 **parent_de,
1560 int *retval)
1561 {
1562 struct ext4_iloc iloc;
1563
1564 *retval = ext4_get_inode_loc(inode, &iloc);
1565 if (*retval)
1566 return NULL;
1567
1568 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1569
1570 return iloc.bh;
1571 }
1572
1573 /*
1574 * Try to create the inline data for the new dir.
1575 * If it succeeds, return 0, otherwise return the error.
1576 * In case of ENOSPC, the caller should create the normal disk layout dir.
1577 */
1578 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1579 struct inode *inode)
1580 {
1581 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1582 struct ext4_iloc iloc;
1583 struct ext4_dir_entry_2 *de;
1584
1585 ret = ext4_get_inode_loc(inode, &iloc);
1586 if (ret)
1587 return ret;
1588
1589 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1590 if (ret)
1591 goto out;
1592
1593 /*
1594 * For inline dir, we only save the inode information for the ".."
1595 * and create a fake dentry to cover the left space.
1596 */
1597 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1598 de->inode = cpu_to_le32(parent->i_ino);
1599 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1600 de->inode = 0;
1601 de->rec_len = ext4_rec_len_to_disk(
1602 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1603 inline_size);
1604 set_nlink(inode, 2);
1605 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1606 out:
1607 brelse(iloc.bh);
1608 return ret;
1609 }
1610
1611 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1612 struct ext4_filename *fname,
1613 const struct qstr *d_name,
1614 struct ext4_dir_entry_2 **res_dir,
1615 int *has_inline_data)
1616 {
1617 int ret;
1618 struct ext4_iloc iloc;
1619 void *inline_start;
1620 int inline_size;
1621
1622 if (ext4_get_inode_loc(dir, &iloc))
1623 return NULL;
1624
1625 down_read(&EXT4_I(dir)->xattr_sem);
1626 if (!ext4_has_inline_data(dir)) {
1627 *has_inline_data = 0;
1628 goto out;
1629 }
1630
1631 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1632 EXT4_INLINE_DOTDOT_SIZE;
1633 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1634 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1635 dir, fname, d_name, 0, res_dir);
1636 if (ret == 1)
1637 goto out_find;
1638 if (ret < 0)
1639 goto out;
1640
1641 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1642 goto out;
1643
1644 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1645 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1646
1647 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1648 dir, fname, d_name, 0, res_dir);
1649 if (ret == 1)
1650 goto out_find;
1651
1652 out:
1653 brelse(iloc.bh);
1654 iloc.bh = NULL;
1655 out_find:
1656 up_read(&EXT4_I(dir)->xattr_sem);
1657 return iloc.bh;
1658 }
1659
1660 int ext4_delete_inline_entry(handle_t *handle,
1661 struct inode *dir,
1662 struct ext4_dir_entry_2 *de_del,
1663 struct buffer_head *bh,
1664 int *has_inline_data)
1665 {
1666 int err, inline_size;
1667 struct ext4_iloc iloc;
1668 void *inline_start;
1669
1670 err = ext4_get_inode_loc(dir, &iloc);
1671 if (err)
1672 return err;
1673
1674 down_write(&EXT4_I(dir)->xattr_sem);
1675 if (!ext4_has_inline_data(dir)) {
1676 *has_inline_data = 0;
1677 goto out;
1678 }
1679
1680 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1681 EXT4_MIN_INLINE_DATA_SIZE) {
1682 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1683 EXT4_INLINE_DOTDOT_SIZE;
1684 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1685 EXT4_INLINE_DOTDOT_SIZE;
1686 } else {
1687 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1688 inline_size = ext4_get_inline_size(dir) -
1689 EXT4_MIN_INLINE_DATA_SIZE;
1690 }
1691
1692 BUFFER_TRACE(bh, "get_write_access");
1693 err = ext4_journal_get_write_access(handle, bh);
1694 if (err)
1695 goto out;
1696
1697 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1698 inline_start, inline_size, 0);
1699 if (err)
1700 goto out;
1701
1702 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1703 err = ext4_mark_inode_dirty(handle, dir);
1704 if (unlikely(err))
1705 goto out;
1706
1707 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1708 out:
1709 up_write(&EXT4_I(dir)->xattr_sem);
1710 brelse(iloc.bh);
1711 if (err != -ENOENT)
1712 ext4_std_error(dir->i_sb, err);
1713 return err;
1714 }
1715
1716 /*
1717 * Get the inline dentry at offset.
1718 */
1719 static inline struct ext4_dir_entry_2 *
1720 ext4_get_inline_entry(struct inode *inode,
1721 struct ext4_iloc *iloc,
1722 unsigned int offset,
1723 void **inline_start,
1724 int *inline_size)
1725 {
1726 void *inline_pos;
1727
1728 BUG_ON(offset > ext4_get_inline_size(inode));
1729
1730 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1731 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1732 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1733 } else {
1734 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1735 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1736 *inline_size = ext4_get_inline_size(inode) -
1737 EXT4_MIN_INLINE_DATA_SIZE;
1738 }
1739
1740 if (inline_start)
1741 *inline_start = inline_pos;
1742 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1743 }
1744
1745 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1746 {
1747 int err, inline_size;
1748 struct ext4_iloc iloc;
1749 void *inline_pos;
1750 unsigned int offset;
1751 struct ext4_dir_entry_2 *de;
1752 int ret = 1;
1753
1754 err = ext4_get_inode_loc(dir, &iloc);
1755 if (err) {
1756 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1757 err, dir->i_ino);
1758 return 1;
1759 }
1760
1761 down_read(&EXT4_I(dir)->xattr_sem);
1762 if (!ext4_has_inline_data(dir)) {
1763 *has_inline_data = 0;
1764 goto out;
1765 }
1766
1767 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1768 if (!le32_to_cpu(de->inode)) {
1769 ext4_warning(dir->i_sb,
1770 "bad inline directory (dir #%lu) - no `..'",
1771 dir->i_ino);
1772 ret = 1;
1773 goto out;
1774 }
1775
1776 offset = EXT4_INLINE_DOTDOT_SIZE;
1777 while (offset < dir->i_size) {
1778 de = ext4_get_inline_entry(dir, &iloc, offset,
1779 &inline_pos, &inline_size);
1780 if (ext4_check_dir_entry(dir, NULL, de,
1781 iloc.bh, inline_pos,
1782 inline_size, offset)) {
1783 ext4_warning(dir->i_sb,
1784 "bad inline directory (dir #%lu) - "
1785 "inode %u, rec_len %u, name_len %d"
1786 "inline size %d\n",
1787 dir->i_ino, le32_to_cpu(de->inode),
1788 le16_to_cpu(de->rec_len), de->name_len,
1789 inline_size);
1790 ret = 1;
1791 goto out;
1792 }
1793 if (le32_to_cpu(de->inode)) {
1794 ret = 0;
1795 goto out;
1796 }
1797 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1798 }
1799
1800 out:
1801 up_read(&EXT4_I(dir)->xattr_sem);
1802 brelse(iloc.bh);
1803 return ret;
1804 }
1805
1806 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1807 {
1808 int ret;
1809
1810 down_write(&EXT4_I(inode)->xattr_sem);
1811 ret = ext4_destroy_inline_data_nolock(handle, inode);
1812 up_write(&EXT4_I(inode)->xattr_sem);
1813
1814 return ret;
1815 }
1816
1817 int ext4_inline_data_fiemap(struct inode *inode,
1818 struct fiemap_extent_info *fieinfo,
1819 int *has_inline, __u64 start, __u64 len)
1820 {
1821 __u64 physical = 0;
1822 __u64 inline_len;
1823 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1824 FIEMAP_EXTENT_LAST;
1825 int error = 0;
1826 struct ext4_iloc iloc;
1827
1828 down_read(&EXT4_I(inode)->xattr_sem);
1829 if (!ext4_has_inline_data(inode)) {
1830 *has_inline = 0;
1831 goto out;
1832 }
1833 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1834 i_size_read(inode));
1835 if (start >= inline_len)
1836 goto out;
1837 if (start + len < inline_len)
1838 inline_len = start + len;
1839 inline_len -= start;
1840
1841 error = ext4_get_inode_loc(inode, &iloc);
1842 if (error)
1843 goto out;
1844
1845 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1846 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1847 physical += offsetof(struct ext4_inode, i_block);
1848
1849 if (physical)
1850 error = fiemap_fill_next_extent(fieinfo, start, physical,
1851 inline_len, flags);
1852 brelse(iloc.bh);
1853 out:
1854 up_read(&EXT4_I(inode)->xattr_sem);
1855 return (error < 0 ? error : 0);
1856 }
1857
1858 /*
1859 * Called during xattr set, and if we can sparse space 'needed',
1860 * just create the extent tree evict the data to the outer block.
1861 *
1862 * We use jbd2 instead of page cache to move data to the 1st block
1863 * so that the whole transaction can be committed as a whole and
1864 * the data isn't lost because of the delayed page cache write.
1865 */
1866 int ext4_try_to_evict_inline_data(handle_t *handle,
1867 struct inode *inode,
1868 int needed)
1869 {
1870 int error;
1871 struct ext4_xattr_entry *entry;
1872 struct ext4_inode *raw_inode;
1873 struct ext4_iloc iloc;
1874
1875 error = ext4_get_inode_loc(inode, &iloc);
1876 if (error)
1877 return error;
1878
1879 raw_inode = ext4_raw_inode(&iloc);
1880 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1881 EXT4_I(inode)->i_inline_off);
1882 if (EXT4_XATTR_LEN(entry->e_name_len) +
1883 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1884 error = -ENOSPC;
1885 goto out;
1886 }
1887
1888 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1889 out:
1890 brelse(iloc.bh);
1891 return error;
1892 }
1893
1894 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1895 {
1896 handle_t *handle;
1897 int inline_size, value_len, needed_blocks;
1898 size_t i_size;
1899 void *value = NULL;
1900 struct ext4_xattr_ibody_find is = {
1901 .s = { .not_found = -ENODATA, },
1902 };
1903 struct ext4_xattr_info i = {
1904 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1905 .name = EXT4_XATTR_SYSTEM_DATA,
1906 };
1907
1908
1909 needed_blocks = ext4_writepage_trans_blocks(inode);
1910 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1911 if (IS_ERR(handle))
1912 return;
1913
1914 down_write(&EXT4_I(inode)->xattr_sem);
1915 if (!ext4_has_inline_data(inode)) {
1916 *has_inline = 0;
1917 ext4_journal_stop(handle);
1918 return;
1919 }
1920
1921 if (ext4_orphan_add(handle, inode))
1922 goto out;
1923
1924 if (ext4_get_inode_loc(inode, &is.iloc))
1925 goto out;
1926
1927 down_write(&EXT4_I(inode)->i_data_sem);
1928 i_size = inode->i_size;
1929 inline_size = ext4_get_inline_size(inode);
1930 EXT4_I(inode)->i_disksize = i_size;
1931
1932 if (i_size < inline_size) {
1933 /* Clear the content in the xattr space. */
1934 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1935 if (ext4_xattr_ibody_find(inode, &i, &is))
1936 goto out_error;
1937
1938 BUG_ON(is.s.not_found);
1939
1940 value_len = le32_to_cpu(is.s.here->e_value_size);
1941 value = kmalloc(value_len, GFP_NOFS);
1942 if (!value)
1943 goto out_error;
1944
1945 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1946 value, value_len))
1947 goto out_error;
1948
1949 i.value = value;
1950 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1951 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1952 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1953 goto out_error;
1954 }
1955
1956 /* Clear the content within i_blocks. */
1957 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1958 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1959 memset(p + i_size, 0,
1960 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1961 }
1962
1963 EXT4_I(inode)->i_inline_size = i_size <
1964 EXT4_MIN_INLINE_DATA_SIZE ?
1965 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1966 }
1967
1968 out_error:
1969 up_write(&EXT4_I(inode)->i_data_sem);
1970 out:
1971 brelse(is.iloc.bh);
1972 up_write(&EXT4_I(inode)->xattr_sem);
1973 kfree(value);
1974 if (inode->i_nlink)
1975 ext4_orphan_del(handle, inode);
1976
1977 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1978 ext4_mark_inode_dirty(handle, inode);
1979 if (IS_SYNC(inode))
1980 ext4_handle_sync(handle);
1981
1982 ext4_journal_stop(handle);
1983 return;
1984 }
1985
1986 int ext4_convert_inline_data(struct inode *inode)
1987 {
1988 int error, needed_blocks;
1989 handle_t *handle;
1990 struct ext4_iloc iloc;
1991
1992 if (!ext4_has_inline_data(inode)) {
1993 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1994 return 0;
1995 }
1996
1997 needed_blocks = ext4_writepage_trans_blocks(inode);
1998
1999 iloc.bh = NULL;
2000 error = ext4_get_inode_loc(inode, &iloc);
2001 if (error)
2002 return error;
2003
2004 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2005 if (IS_ERR(handle)) {
2006 error = PTR_ERR(handle);
2007 goto out_free;
2008 }
2009
2010 down_write(&EXT4_I(inode)->xattr_sem);
2011 if (!ext4_has_inline_data(inode)) {
2012 up_write(&EXT4_I(inode)->xattr_sem);
2013 goto out;
2014 }
2015
2016 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2017 up_write(&EXT4_I(inode)->xattr_sem);
2018 out:
2019 ext4_journal_stop(handle);
2020 out_free:
2021 brelse(iloc.bh);
2022 return error;
2023 }
Linux with added FPC-III support