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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / fs / ext4 / inline.c
blob7bc6c855cc18ca992ac3830d3b3010e63597bc5d
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_feature_extents(inode->i_sb)) {
438 if (S_ISDIR(inode->i_mode) ||
439 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
440 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
441 ext4_ext_tree_init(handle, inode);
442 }
443 }
444 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
445
446 get_bh(is.iloc.bh);
447 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
448
449 EXT4_I(inode)->i_inline_off = 0;
450 EXT4_I(inode)->i_inline_size = 0;
451 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
452 out:
453 brelse(is.iloc.bh);
454 if (error == -ENODATA)
455 error = 0;
456 return error;
457 }
458
459 static int ext4_read_inline_page(struct inode *inode, struct page *page)
460 {
461 void *kaddr;
462 int ret = 0;
463 size_t len;
464 struct ext4_iloc iloc;
465
466 BUG_ON(!PageLocked(page));
467 BUG_ON(!ext4_has_inline_data(inode));
468 BUG_ON(page->index);
469
470 if (!EXT4_I(inode)->i_inline_off) {
471 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
472 inode->i_ino);
473 goto out;
474 }
475
476 ret = ext4_get_inode_loc(inode, &iloc);
477 if (ret)
478 goto out;
479
480 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
481 kaddr = kmap_atomic(page);
482 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
483 flush_dcache_page(page);
484 kunmap_atomic(kaddr);
485 zero_user_segment(page, len, PAGE_SIZE);
486 SetPageUptodate(page);
487 brelse(iloc.bh);
488
489 out:
490 return ret;
491 }
492
493 int ext4_readpage_inline(struct inode *inode, struct page *page)
494 {
495 int ret = 0;
496
497 down_read(&EXT4_I(inode)->xattr_sem);
498 if (!ext4_has_inline_data(inode)) {
499 up_read(&EXT4_I(inode)->xattr_sem);
500 return -EAGAIN;
501 }
502
503 /*
504 * Current inline data can only exist in the 1st page,
505 * So for all the other pages, just set them uptodate.
506 */
507 if (!page->index)
508 ret = ext4_read_inline_page(inode, page);
509 else if (!PageUptodate(page)) {
510 zero_user_segment(page, 0, PAGE_SIZE);
511 SetPageUptodate(page);
512 }
513
514 up_read(&EXT4_I(inode)->xattr_sem);
515
516 unlock_page(page);
517 return ret >= 0 ? 0 : ret;
518 }
519
520 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
521 struct inode *inode,
522 unsigned flags)
523 {
524 int ret, needed_blocks;
525 handle_t *handle = NULL;
526 int retries = 0, sem_held = 0;
527 struct page *page = NULL;
528 unsigned from, to;
529 struct ext4_iloc iloc;
530
531 if (!ext4_has_inline_data(inode)) {
532 /*
533 * clear the flag so that no new write
534 * will trap here again.
535 */
536 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
537 return 0;
538 }
539
540 needed_blocks = ext4_writepage_trans_blocks(inode);
541
542 ret = ext4_get_inode_loc(inode, &iloc);
543 if (ret)
544 return ret;
545
546 retry:
547 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
548 if (IS_ERR(handle)) {
549 ret = PTR_ERR(handle);
550 handle = NULL;
551 goto out;
552 }
553
554 /* We cannot recurse into the filesystem as the transaction is already
555 * started */
556 flags |= AOP_FLAG_NOFS;
557
558 page = grab_cache_page_write_begin(mapping, 0, flags);
559 if (!page) {
560 ret = -ENOMEM;
561 goto out;
562 }
563
564 down_write(&EXT4_I(inode)->xattr_sem);
565 sem_held = 1;
566 /* If some one has already done this for us, just exit. */
567 if (!ext4_has_inline_data(inode)) {
568 ret = 0;
569 goto out;
570 }
571
572 from = 0;
573 to = ext4_get_inline_size(inode);
574 if (!PageUptodate(page)) {
575 ret = ext4_read_inline_page(inode, page);
576 if (ret < 0)
577 goto out;
578 }
579
580 ret = ext4_destroy_inline_data_nolock(handle, inode);
581 if (ret)
582 goto out;
583
584 if (ext4_should_dioread_nolock(inode)) {
585 ret = __block_write_begin(page, from, to,
586 ext4_get_block_unwritten);
587 } else
588 ret = __block_write_begin(page, from, to, ext4_get_block);
589
590 if (!ret && ext4_should_journal_data(inode)) {
591 ret = ext4_walk_page_buffers(handle, page_buffers(page),
592 from, to, NULL,
593 do_journal_get_write_access);
594 }
595
596 if (ret) {
597 unlock_page(page);
598 put_page(page);
599 page = NULL;
600 ext4_orphan_add(handle, inode);
601 up_write(&EXT4_I(inode)->xattr_sem);
602 sem_held = 0;
603 ext4_journal_stop(handle);
604 handle = NULL;
605 ext4_truncate_failed_write(inode);
606 /*
607 * If truncate failed early the inode might
608 * still be on the orphan list; we need to
609 * make sure the inode is removed from the
610 * orphan list in that case.
611 */
612 if (inode->i_nlink)
613 ext4_orphan_del(NULL, inode);
614 }
615
616 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
617 goto retry;
618
619 if (page)
620 block_commit_write(page, from, to);
621 out:
622 if (page) {
623 unlock_page(page);
624 put_page(page);
625 }
626 if (sem_held)
627 up_write(&EXT4_I(inode)->xattr_sem);
628 if (handle)
629 ext4_journal_stop(handle);
630 brelse(iloc.bh);
631 return ret;
632 }
633
634 /*
635 * Try to write data in the inode.
636 * If the inode has inline data, check whether the new write can be
637 * in the inode also. If not, create the page the handle, move the data
638 * to the page make it update and let the later codes create extent for it.
639 */
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 put_page(page);
694 goto out_up_read;
695 }
696
697 if (!PageUptodate(page)) {
698 ret = ext4_read_inline_page(inode, page);
699 if (ret < 0)
700 goto out_up_read;
701 }
702
703 ret = 1;
704 handle = NULL;
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 put_page(page);
819 ext4_truncate_failed_write(inode);
820 return ret;
821 }
822
823 SetPageDirty(page);
824 SetPageUptodate(page);
825 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
826 *fsdata = (void *)CONVERT_INLINE_DATA;
827
828 out:
829 up_read(&EXT4_I(inode)->xattr_sem);
830 if (page) {
831 unlock_page(page);
832 put_page(page);
833 }
834 return ret;
835 }
836
837 /*
838 * Prepare the write for the inline data.
839 * If the the data can be written into the inode, we just read
840 * the page and make it uptodate, and start the journal.
841 * Otherwise read the page, makes it dirty so that it can be
842 * handle in writepages(the i_disksize update is left to the
843 * normal ext4_da_write_end).
844 */
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 put_page(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 put_page(page);
951
952 /*
953 * Don't mark the inode dirty under page lock. First, it unnecessarily
954 * makes the holding time of page lock longer. Second, it forces lock
955 * ordering of page lock and transaction start for journaling
956 * filesystems.
957 */
958 if (i_size_changed)
959 mark_inode_dirty(inode);
960
961 return copied;
962 }
963
964 #ifdef INLINE_DIR_DEBUG
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 inode *dir,
1000 struct inode *inode,
1001 struct ext4_iloc *iloc,
1002 void *inline_start, int inline_size)
1003 {
1004 int err;
1005 struct ext4_dir_entry_2 *de;
1006
1007 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1008 inline_size, fname, &de);
1009 if (err)
1010 return err;
1011
1012 BUFFER_TRACE(iloc->bh, "get_write_access");
1013 err = ext4_journal_get_write_access(handle, iloc->bh);
1014 if (err)
1015 return err;
1016 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1017
1018 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1019
1020 /*
1021 * XXX shouldn't update any times until successful
1022 * completion of syscall, but too many callers depend
1023 * on this.
1024 *
1025 * XXX similarly, too many callers depend on
1026 * ext4_new_inode() setting the times, but error
1027 * recovery deletes the inode, so the worst that can
1028 * happen is that the times are slightly out of date
1029 * and/or different from the directory change time.
1030 */
1031 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1032 ext4_update_dx_flag(dir);
1033 dir->i_version++;
1034 ext4_mark_inode_dirty(handle, dir);
1035 return 1;
1036 }
1037
1038 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1039 struct ext4_iloc *iloc)
1040 {
1041 struct ext4_xattr_entry *entry;
1042 struct ext4_xattr_ibody_header *header;
1043
1044 BUG_ON(!EXT4_I(inode)->i_inline_off);
1045
1046 header = IHDR(inode, ext4_raw_inode(iloc));
1047 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1048 EXT4_I(inode)->i_inline_off);
1049
1050 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1051 }
1052
1053 /* Set the final de to cover the whole block. */
1054 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1055 {
1056 struct ext4_dir_entry_2 *de, *prev_de;
1057 void *limit;
1058 int de_len;
1059
1060 de = (struct ext4_dir_entry_2 *)de_buf;
1061 if (old_size) {
1062 limit = de_buf + old_size;
1063 do {
1064 prev_de = de;
1065 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1066 de_buf += de_len;
1067 de = (struct ext4_dir_entry_2 *)de_buf;
1068 } while (de_buf < limit);
1069
1070 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1071 old_size, new_size);
1072 } else {
1073 /* this is just created, so create an empty entry. */
1074 de->inode = 0;
1075 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1076 }
1077 }
1078
1079 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1080 struct ext4_iloc *iloc)
1081 {
1082 int ret;
1083 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1084 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1085
1086 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1087 return -ENOSPC;
1088
1089 ret = ext4_update_inline_data(handle, dir,
1090 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1091 if (ret)
1092 return ret;
1093
1094 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1095 EXT4_I(dir)->i_inline_size -
1096 EXT4_MIN_INLINE_DATA_SIZE);
1097 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1098 return 0;
1099 }
1100
1101 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1102 struct ext4_iloc *iloc,
1103 void *buf, int inline_size)
1104 {
1105 ext4_create_inline_data(handle, inode, inline_size);
1106 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1107 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1108 }
1109
1110 static int ext4_finish_convert_inline_dir(handle_t *handle,
1111 struct inode *inode,
1112 struct buffer_head *dir_block,
1113 void *buf,
1114 int inline_size)
1115 {
1116 int err, csum_size = 0, header_size = 0;
1117 struct ext4_dir_entry_2 *de;
1118 struct ext4_dir_entry_tail *t;
1119 void *target = dir_block->b_data;
1120
1121 /*
1122 * First create "." and ".." and then copy the dir information
1123 * back to the block.
1124 */
1125 de = (struct ext4_dir_entry_2 *)target;
1126 de = ext4_init_dot_dotdot(inode, de,
1127 inode->i_sb->s_blocksize, csum_size,
1128 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1129 header_size = (void *)de - target;
1130
1131 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1132 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1133
1134 if (ext4_has_metadata_csum(inode->i_sb))
1135 csum_size = sizeof(struct ext4_dir_entry_tail);
1136
1137 inode->i_size = inode->i_sb->s_blocksize;
1138 i_size_write(inode, inode->i_sb->s_blocksize);
1139 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1140 ext4_update_final_de(dir_block->b_data,
1141 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1142 inode->i_sb->s_blocksize - csum_size);
1143
1144 if (csum_size) {
1145 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1146 inode->i_sb->s_blocksize);
1147 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1148 }
1149 set_buffer_uptodate(dir_block);
1150 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1151 if (err)
1152 goto out;
1153 set_buffer_verified(dir_block);
1154 out:
1155 return err;
1156 }
1157
1158 static int ext4_convert_inline_data_nolock(handle_t *handle,
1159 struct inode *inode,
1160 struct ext4_iloc *iloc)
1161 {
1162 int error;
1163 void *buf = NULL;
1164 struct buffer_head *data_bh = NULL;
1165 struct ext4_map_blocks map;
1166 int inline_size;
1167
1168 inline_size = ext4_get_inline_size(inode);
1169 buf = kmalloc(inline_size, GFP_NOFS);
1170 if (!buf) {
1171 error = -ENOMEM;
1172 goto out;
1173 }
1174
1175 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1176 if (error < 0)
1177 goto out;
1178
1179 /*
1180 * Make sure the inline directory entries pass checks before we try to
1181 * convert them, so that we avoid touching stuff that needs fsck.
1182 */
1183 if (S_ISDIR(inode->i_mode)) {
1184 error = ext4_check_all_de(inode, iloc->bh,
1185 buf + EXT4_INLINE_DOTDOT_SIZE,
1186 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1187 if (error)
1188 goto out;
1189 }
1190
1191 error = ext4_destroy_inline_data_nolock(handle, inode);
1192 if (error)
1193 goto out;
1194
1195 map.m_lblk = 0;
1196 map.m_len = 1;
1197 map.m_flags = 0;
1198 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1199 if (error < 0)
1200 goto out_restore;
1201 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1202 error = -EIO;
1203 goto out_restore;
1204 }
1205
1206 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1207 if (!data_bh) {
1208 error = -ENOMEM;
1209 goto out_restore;
1210 }
1211
1212 lock_buffer(data_bh);
1213 error = ext4_journal_get_create_access(handle, data_bh);
1214 if (error) {
1215 unlock_buffer(data_bh);
1216 error = -EIO;
1217 goto out_restore;
1218 }
1219 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1220
1221 if (!S_ISDIR(inode->i_mode)) {
1222 memcpy(data_bh->b_data, buf, inline_size);
1223 set_buffer_uptodate(data_bh);
1224 error = ext4_handle_dirty_metadata(handle,
1225 inode, data_bh);
1226 } else {
1227 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1228 buf, inline_size);
1229 }
1230
1231 unlock_buffer(data_bh);
1232 out_restore:
1233 if (error)
1234 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1235
1236 out:
1237 brelse(data_bh);
1238 kfree(buf);
1239 return error;
1240 }
1241
1242 /*
1243 * Try to add the new entry to the inline data.
1244 * If succeeds, return 0. If not, extended the inline dir and copied data to
1245 * the new created block.
1246 */
1247 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1248 struct inode *dir, struct inode *inode)
1249 {
1250 int ret, inline_size;
1251 void *inline_start;
1252 struct ext4_iloc iloc;
1253
1254 ret = ext4_get_inode_loc(dir, &iloc);
1255 if (ret)
1256 return ret;
1257
1258 down_write(&EXT4_I(dir)->xattr_sem);
1259 if (!ext4_has_inline_data(dir))
1260 goto out;
1261
1262 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1263 EXT4_INLINE_DOTDOT_SIZE;
1264 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1265
1266 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1267 inline_start, inline_size);
1268 if (ret != -ENOSPC)
1269 goto out;
1270
1271 /* check whether it can be inserted to inline xattr space. */
1272 inline_size = EXT4_I(dir)->i_inline_size -
1273 EXT4_MIN_INLINE_DATA_SIZE;
1274 if (!inline_size) {
1275 /* Try to use the xattr space.*/
1276 ret = ext4_update_inline_dir(handle, dir, &iloc);
1277 if (ret && ret != -ENOSPC)
1278 goto out;
1279
1280 inline_size = EXT4_I(dir)->i_inline_size -
1281 EXT4_MIN_INLINE_DATA_SIZE;
1282 }
1283
1284 if (inline_size) {
1285 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1286
1287 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1288 inode, &iloc, inline_start,
1289 inline_size);
1290
1291 if (ret != -ENOSPC)
1292 goto out;
1293 }
1294
1295 /*
1296 * The inline space is filled up, so create a new block for it.
1297 * As the extent tree will be created, we have to save the inline
1298 * dir first.
1299 */
1300 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1301
1302 out:
1303 ext4_mark_inode_dirty(handle, dir);
1304 up_write(&EXT4_I(dir)->xattr_sem);
1305 brelse(iloc.bh);
1306 return ret;
1307 }
1308
1309 /*
1310 * This function fills a red-black tree with information from an
1311 * inlined dir. It returns the number directory entries loaded
1312 * into the tree. If there is an error it is returned in err.
1313 */
1314 int htree_inlinedir_to_tree(struct file *dir_file,
1315 struct inode *dir, ext4_lblk_t block,
1316 struct dx_hash_info *hinfo,
1317 __u32 start_hash, __u32 start_minor_hash,
1318 int *has_inline_data)
1319 {
1320 int err = 0, count = 0;
1321 unsigned int parent_ino;
1322 int pos;
1323 struct ext4_dir_entry_2 *de;
1324 struct inode *inode = file_inode(dir_file);
1325 int ret, inline_size = 0;
1326 struct ext4_iloc iloc;
1327 void *dir_buf = NULL;
1328 struct ext4_dir_entry_2 fake;
1329 struct ext4_str tmp_str;
1330
1331 ret = ext4_get_inode_loc(inode, &iloc);
1332 if (ret)
1333 return ret;
1334
1335 down_read(&EXT4_I(inode)->xattr_sem);
1336 if (!ext4_has_inline_data(inode)) {
1337 up_read(&EXT4_I(inode)->xattr_sem);
1338 *has_inline_data = 0;
1339 goto out;
1340 }
1341
1342 inline_size = ext4_get_inline_size(inode);
1343 dir_buf = kmalloc(inline_size, GFP_NOFS);
1344 if (!dir_buf) {
1345 ret = -ENOMEM;
1346 up_read(&EXT4_I(inode)->xattr_sem);
1347 goto out;
1348 }
1349
1350 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1351 up_read(&EXT4_I(inode)->xattr_sem);
1352 if (ret < 0)
1353 goto out;
1354
1355 pos = 0;
1356 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1357 while (pos < inline_size) {
1358 /*
1359 * As inlined dir doesn't store any information about '.' and
1360 * only the inode number of '..' is stored, we have to handle
1361 * them differently.
1362 */
1363 if (pos == 0) {
1364 fake.inode = cpu_to_le32(inode->i_ino);
1365 fake.name_len = 1;
1366 strcpy(fake.name, ".");
1367 fake.rec_len = ext4_rec_len_to_disk(
1368 EXT4_DIR_REC_LEN(fake.name_len),
1369 inline_size);
1370 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1371 de = &fake;
1372 pos = EXT4_INLINE_DOTDOT_OFFSET;
1373 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1374 fake.inode = cpu_to_le32(parent_ino);
1375 fake.name_len = 2;
1376 strcpy(fake.name, "..");
1377 fake.rec_len = ext4_rec_len_to_disk(
1378 EXT4_DIR_REC_LEN(fake.name_len),
1379 inline_size);
1380 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1381 de = &fake;
1382 pos = EXT4_INLINE_DOTDOT_SIZE;
1383 } else {
1384 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1385 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1386 if (ext4_check_dir_entry(inode, dir_file, de,
1387 iloc.bh, dir_buf,
1388 inline_size, pos)) {
1389 ret = count;
1390 goto out;
1391 }
1392 }
1393
1394 ext4fs_dirhash(de->name, de->name_len, hinfo);
1395 if ((hinfo->hash < start_hash) ||
1396 ((hinfo->hash == start_hash) &&
1397 (hinfo->minor_hash < start_minor_hash)))
1398 continue;
1399 if (de->inode == 0)
1400 continue;
1401 tmp_str.name = de->name;
1402 tmp_str.len = de->name_len;
1403 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1404 hinfo->minor_hash, de, &tmp_str);
1405 if (err) {
1406 count = err;
1407 goto out;
1408 }
1409 count++;
1410 }
1411 ret = count;
1412 out:
1413 kfree(dir_buf);
1414 brelse(iloc.bh);
1415 return ret;
1416 }
1417
1418 /*
1419 * So this function is called when the volume is mkfsed with
1420 * dir_index disabled. In order to keep f_pos persistent
1421 * after we convert from an inlined dir to a blocked based,
1422 * we just pretend that we are a normal dir and return the
1423 * offset as if '.' and '..' really take place.
1424 *
1425 */
1426 int ext4_read_inline_dir(struct file *file,
1427 struct dir_context *ctx,
1428 int *has_inline_data)
1429 {
1430 unsigned int offset, parent_ino;
1431 int i;
1432 struct ext4_dir_entry_2 *de;
1433 struct super_block *sb;
1434 struct inode *inode = file_inode(file);
1435 int ret, inline_size = 0;
1436 struct ext4_iloc iloc;
1437 void *dir_buf = NULL;
1438 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1439
1440 ret = ext4_get_inode_loc(inode, &iloc);
1441 if (ret)
1442 return ret;
1443
1444 down_read(&EXT4_I(inode)->xattr_sem);
1445 if (!ext4_has_inline_data(inode)) {
1446 up_read(&EXT4_I(inode)->xattr_sem);
1447 *has_inline_data = 0;
1448 goto out;
1449 }
1450
1451 inline_size = ext4_get_inline_size(inode);
1452 dir_buf = kmalloc(inline_size, GFP_NOFS);
1453 if (!dir_buf) {
1454 ret = -ENOMEM;
1455 up_read(&EXT4_I(inode)->xattr_sem);
1456 goto out;
1457 }
1458
1459 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1460 up_read(&EXT4_I(inode)->xattr_sem);
1461 if (ret < 0)
1462 goto out;
1463
1464 ret = 0;
1465 sb = inode->i_sb;
1466 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1467 offset = ctx->pos;
1468
1469 /*
1470 * dotdot_offset and dotdot_size is the real offset and
1471 * size for ".." and "." if the dir is block based while
1472 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1473 * So we will use extra_offset and extra_size to indicate them
1474 * during the inline dir iteration.
1475 */
1476 dotdot_offset = EXT4_DIR_REC_LEN(1);
1477 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1478 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1479 extra_size = extra_offset + inline_size;
1480
1481 /*
1482 * If the version has changed since the last call to
1483 * readdir(2), then we might be pointing to an invalid
1484 * dirent right now. Scan from the start of the inline
1485 * dir to make sure.
1486 */
1487 if (file->f_version != inode->i_version) {
1488 for (i = 0; i < extra_size && i < offset;) {
1489 /*
1490 * "." is with offset 0 and
1491 * ".." is dotdot_offset.
1492 */
1493 if (!i) {
1494 i = dotdot_offset;
1495 continue;
1496 } else if (i == dotdot_offset) {
1497 i = dotdot_size;
1498 continue;
1499 }
1500 /* for other entry, the real offset in
1501 * the buf has to be tuned accordingly.
1502 */
1503 de = (struct ext4_dir_entry_2 *)
1504 (dir_buf + i - extra_offset);
1505 /* It's too expensive to do a full
1506 * dirent test each time round this
1507 * loop, but we do have to test at
1508 * least that it is non-zero. A
1509 * failure will be detected in the
1510 * dirent test below. */
1511 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1512 < EXT4_DIR_REC_LEN(1))
1513 break;
1514 i += ext4_rec_len_from_disk(de->rec_len,
1515 extra_size);
1516 }
1517 offset = i;
1518 ctx->pos = offset;
1519 file->f_version = inode->i_version;
1520 }
1521
1522 while (ctx->pos < extra_size) {
1523 if (ctx->pos == 0) {
1524 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1525 goto out;
1526 ctx->pos = dotdot_offset;
1527 continue;
1528 }
1529
1530 if (ctx->pos == dotdot_offset) {
1531 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1532 goto out;
1533 ctx->pos = dotdot_size;
1534 continue;
1535 }
1536
1537 de = (struct ext4_dir_entry_2 *)
1538 (dir_buf + ctx->pos - extra_offset);
1539 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1540 extra_size, ctx->pos))
1541 goto out;
1542 if (le32_to_cpu(de->inode)) {
1543 if (!dir_emit(ctx, de->name, de->name_len,
1544 le32_to_cpu(de->inode),
1545 get_dtype(sb, de->file_type)))
1546 goto out;
1547 }
1548 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1549 }
1550 out:
1551 kfree(dir_buf);
1552 brelse(iloc.bh);
1553 return ret;
1554 }
1555
1556 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1557 struct ext4_dir_entry_2 **parent_de,
1558 int *retval)
1559 {
1560 struct ext4_iloc iloc;
1561
1562 *retval = ext4_get_inode_loc(inode, &iloc);
1563 if (*retval)
1564 return NULL;
1565
1566 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1567
1568 return iloc.bh;
1569 }
1570
1571 /*
1572 * Try to create the inline data for the new dir.
1573 * If it succeeds, return 0, otherwise return the error.
1574 * In case of ENOSPC, the caller should create the normal disk layout dir.
1575 */
1576 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1577 struct inode *inode)
1578 {
1579 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1580 struct ext4_iloc iloc;
1581 struct ext4_dir_entry_2 *de;
1582
1583 ret = ext4_get_inode_loc(inode, &iloc);
1584 if (ret)
1585 return ret;
1586
1587 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1588 if (ret)
1589 goto out;
1590
1591 /*
1592 * For inline dir, we only save the inode information for the ".."
1593 * and create a fake dentry to cover the left space.
1594 */
1595 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1596 de->inode = cpu_to_le32(parent->i_ino);
1597 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1598 de->inode = 0;
1599 de->rec_len = ext4_rec_len_to_disk(
1600 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1601 inline_size);
1602 set_nlink(inode, 2);
1603 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1604 out:
1605 brelse(iloc.bh);
1606 return ret;
1607 }
1608
1609 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1610 struct ext4_filename *fname,
1611 const struct qstr *d_name,
1612 struct ext4_dir_entry_2 **res_dir,
1613 int *has_inline_data)
1614 {
1615 int ret;
1616 struct ext4_iloc iloc;
1617 void *inline_start;
1618 int inline_size;
1619
1620 if (ext4_get_inode_loc(dir, &iloc))
1621 return NULL;
1622
1623 down_read(&EXT4_I(dir)->xattr_sem);
1624 if (!ext4_has_inline_data(dir)) {
1625 *has_inline_data = 0;
1626 goto out;
1627 }
1628
1629 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1630 EXT4_INLINE_DOTDOT_SIZE;
1631 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1632 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1633 dir, fname, d_name, 0, res_dir);
1634 if (ret == 1)
1635 goto out_find;
1636 if (ret < 0)
1637 goto out;
1638
1639 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1640 goto out;
1641
1642 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1643 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1644
1645 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1646 dir, fname, d_name, 0, res_dir);
1647 if (ret == 1)
1648 goto out_find;
1649
1650 out:
1651 brelse(iloc.bh);
1652 iloc.bh = NULL;
1653 out_find:
1654 up_read(&EXT4_I(dir)->xattr_sem);
1655 return iloc.bh;
1656 }
1657
1658 int ext4_delete_inline_entry(handle_t *handle,
1659 struct inode *dir,
1660 struct ext4_dir_entry_2 *de_del,
1661 struct buffer_head *bh,
1662 int *has_inline_data)
1663 {
1664 int err, inline_size;
1665 struct ext4_iloc iloc;
1666 void *inline_start;
1667
1668 err = ext4_get_inode_loc(dir, &iloc);
1669 if (err)
1670 return err;
1671
1672 down_write(&EXT4_I(dir)->xattr_sem);
1673 if (!ext4_has_inline_data(dir)) {
1674 *has_inline_data = 0;
1675 goto out;
1676 }
1677
1678 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1679 EXT4_MIN_INLINE_DATA_SIZE) {
1680 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1681 EXT4_INLINE_DOTDOT_SIZE;
1682 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1683 EXT4_INLINE_DOTDOT_SIZE;
1684 } else {
1685 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1686 inline_size = ext4_get_inline_size(dir) -
1687 EXT4_MIN_INLINE_DATA_SIZE;
1688 }
1689
1690 BUFFER_TRACE(bh, "get_write_access");
1691 err = ext4_journal_get_write_access(handle, bh);
1692 if (err)
1693 goto out;
1694
1695 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1696 inline_start, inline_size, 0);
1697 if (err)
1698 goto out;
1699
1700 err = ext4_mark_inode_dirty(handle, dir);
1701 if (unlikely(err))
1702 goto out;
1703
1704 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1705 out:
1706 up_write(&EXT4_I(dir)->xattr_sem);
1707 brelse(iloc.bh);
1708 if (err != -ENOENT)
1709 ext4_std_error(dir->i_sb, err);
1710 return err;
1711 }
1712
1713 /*
1714 * Get the inline dentry at offset.
1715 */
1716 static inline struct ext4_dir_entry_2 *
1717 ext4_get_inline_entry(struct inode *inode,
1718 struct ext4_iloc *iloc,
1719 unsigned int offset,
1720 void **inline_start,
1721 int *inline_size)
1722 {
1723 void *inline_pos;
1724
1725 BUG_ON(offset > ext4_get_inline_size(inode));
1726
1727 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1728 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1729 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1730 } else {
1731 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1732 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1733 *inline_size = ext4_get_inline_size(inode) -
1734 EXT4_MIN_INLINE_DATA_SIZE;
1735 }
1736
1737 if (inline_start)
1738 *inline_start = inline_pos;
1739 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1740 }
1741
1742 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1743 {
1744 int err, inline_size;
1745 struct ext4_iloc iloc;
1746 void *inline_pos;
1747 unsigned int offset;
1748 struct ext4_dir_entry_2 *de;
1749 int ret = 1;
1750
1751 err = ext4_get_inode_loc(dir, &iloc);
1752 if (err) {
1753 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1754 err, dir->i_ino);
1755 return 1;
1756 }
1757
1758 down_read(&EXT4_I(dir)->xattr_sem);
1759 if (!ext4_has_inline_data(dir)) {
1760 *has_inline_data = 0;
1761 goto out;
1762 }
1763
1764 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1765 if (!le32_to_cpu(de->inode)) {
1766 ext4_warning(dir->i_sb,
1767 "bad inline directory (dir #%lu) - no `..'",
1768 dir->i_ino);
1769 ret = 1;
1770 goto out;
1771 }
1772
1773 offset = EXT4_INLINE_DOTDOT_SIZE;
1774 while (offset < dir->i_size) {
1775 de = ext4_get_inline_entry(dir, &iloc, offset,
1776 &inline_pos, &inline_size);
1777 if (ext4_check_dir_entry(dir, NULL, de,
1778 iloc.bh, inline_pos,
1779 inline_size, offset)) {
1780 ext4_warning(dir->i_sb,
1781 "bad inline directory (dir #%lu) - "
1782 "inode %u, rec_len %u, name_len %d"
1783 "inline size %d\n",
1784 dir->i_ino, le32_to_cpu(de->inode),
1785 le16_to_cpu(de->rec_len), de->name_len,
1786 inline_size);
1787 ret = 1;
1788 goto out;
1789 }
1790 if (le32_to_cpu(de->inode)) {
1791 ret = 0;
1792 goto out;
1793 }
1794 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1795 }
1796
1797 out:
1798 up_read(&EXT4_I(dir)->xattr_sem);
1799 brelse(iloc.bh);
1800 return ret;
1801 }
1802
1803 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1804 {
1805 int ret;
1806
1807 down_write(&EXT4_I(inode)->xattr_sem);
1808 ret = ext4_destroy_inline_data_nolock(handle, inode);
1809 up_write(&EXT4_I(inode)->xattr_sem);
1810
1811 return ret;
1812 }
1813
1814 int ext4_inline_data_fiemap(struct inode *inode,
1815 struct fiemap_extent_info *fieinfo,
1816 int *has_inline, __u64 start, __u64 len)
1817 {
1818 __u64 physical = 0;
1819 __u64 inline_len;
1820 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1821 FIEMAP_EXTENT_LAST;
1822 int error = 0;
1823 struct ext4_iloc iloc;
1824
1825 down_read(&EXT4_I(inode)->xattr_sem);
1826 if (!ext4_has_inline_data(inode)) {
1827 *has_inline = 0;
1828 goto out;
1829 }
1830 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1831 i_size_read(inode));
1832 if (start >= inline_len)
1833 goto out;
1834 if (start + len < inline_len)
1835 inline_len = start + len;
1836 inline_len -= start;
1837
1838 error = ext4_get_inode_loc(inode, &iloc);
1839 if (error)
1840 goto out;
1841
1842 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1843 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1844 physical += offsetof(struct ext4_inode, i_block);
1845
1846 if (physical)
1847 error = fiemap_fill_next_extent(fieinfo, start, physical,
1848 inline_len, flags);
1849 brelse(iloc.bh);
1850 out:
1851 up_read(&EXT4_I(inode)->xattr_sem);
1852 return (error < 0 ? error : 0);
1853 }
1854
1855 /*
1856 * Called during xattr set, and if we can sparse space 'needed',
1857 * just create the extent tree evict the data to the outer block.
1858 *
1859 * We use jbd2 instead of page cache to move data to the 1st block
1860 * so that the whole transaction can be committed as a whole and
1861 * the data isn't lost because of the delayed page cache write.
1862 */
1863 int ext4_try_to_evict_inline_data(handle_t *handle,
1864 struct inode *inode,
1865 int needed)
1866 {
1867 int error;
1868 struct ext4_xattr_entry *entry;
1869 struct ext4_inode *raw_inode;
1870 struct ext4_iloc iloc;
1871
1872 error = ext4_get_inode_loc(inode, &iloc);
1873 if (error)
1874 return error;
1875
1876 raw_inode = ext4_raw_inode(&iloc);
1877 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1878 EXT4_I(inode)->i_inline_off);
1879 if (EXT4_XATTR_LEN(entry->e_name_len) +
1880 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1881 error = -ENOSPC;
1882 goto out;
1883 }
1884
1885 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1886 out:
1887 brelse(iloc.bh);
1888 return error;
1889 }
1890
1891 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1892 {
1893 handle_t *handle;
1894 int inline_size, value_len, needed_blocks;
1895 size_t i_size;
1896 void *value = NULL;
1897 struct ext4_xattr_ibody_find is = {
1898 .s = { .not_found = -ENODATA, },
1899 };
1900 struct ext4_xattr_info i = {
1901 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1902 .name = EXT4_XATTR_SYSTEM_DATA,
1903 };
1904
1905
1906 needed_blocks = ext4_writepage_trans_blocks(inode);
1907 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1908 if (IS_ERR(handle))
1909 return;
1910
1911 down_write(&EXT4_I(inode)->xattr_sem);
1912 if (!ext4_has_inline_data(inode)) {
1913 *has_inline = 0;
1914 ext4_journal_stop(handle);
1915 return;
1916 }
1917
1918 if (ext4_orphan_add(handle, inode))
1919 goto out;
1920
1921 if (ext4_get_inode_loc(inode, &is.iloc))
1922 goto out;
1923
1924 down_write(&EXT4_I(inode)->i_data_sem);
1925 i_size = inode->i_size;
1926 inline_size = ext4_get_inline_size(inode);
1927 EXT4_I(inode)->i_disksize = i_size;
1928
1929 if (i_size < inline_size) {
1930 /* Clear the content in the xattr space. */
1931 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1932 if (ext4_xattr_ibody_find(inode, &i, &is))
1933 goto out_error;
1934
1935 BUG_ON(is.s.not_found);
1936
1937 value_len = le32_to_cpu(is.s.here->e_value_size);
1938 value = kmalloc(value_len, GFP_NOFS);
1939 if (!value)
1940 goto out_error;
1941
1942 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1943 value, value_len))
1944 goto out_error;
1945
1946 i.value = value;
1947 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1948 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1949 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1950 goto out_error;
1951 }
1952
1953 /* Clear the content within i_blocks. */
1954 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1955 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1956 memset(p + i_size, 0,
1957 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1958 }
1959
1960 EXT4_I(inode)->i_inline_size = i_size <
1961 EXT4_MIN_INLINE_DATA_SIZE ?
1962 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1963 }
1964
1965 out_error:
1966 up_write(&EXT4_I(inode)->i_data_sem);
1967 out:
1968 brelse(is.iloc.bh);
1969 up_write(&EXT4_I(inode)->xattr_sem);
1970 kfree(value);
1971 if (inode->i_nlink)
1972 ext4_orphan_del(handle, inode);
1973
1974 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1975 ext4_mark_inode_dirty(handle, inode);
1976 if (IS_SYNC(inode))
1977 ext4_handle_sync(handle);
1978
1979 ext4_journal_stop(handle);
1980 return;
1981 }
1982
1983 int ext4_convert_inline_data(struct inode *inode)
1984 {
1985 int error, needed_blocks;
1986 handle_t *handle;
1987 struct ext4_iloc iloc;
1988
1989 if (!ext4_has_inline_data(inode)) {
1990 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1991 return 0;
1992 }
1993
1994 needed_blocks = ext4_writepage_trans_blocks(inode);
1995
1996 iloc.bh = NULL;
1997 error = ext4_get_inode_loc(inode, &iloc);
1998 if (error)
1999 return error;
2000
2001 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2002 if (IS_ERR(handle)) {
2003 error = PTR_ERR(handle);
2004 goto out_free;
2005 }
2006
2007 down_write(&EXT4_I(inode)->xattr_sem);
2008 if (!ext4_has_inline_data(inode)) {
2009 up_write(&EXT4_I(inode)->xattr_sem);
2010 goto out;
2011 }
2012
2013 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2014 up_write(&EXT4_I(inode)->xattr_sem);
2015 out:
2016 ext4_journal_stop(handle);
2017 out_free:
2018 brelse(iloc.bh);
2019 return error;
2020 }
Linux with added FPC-III support