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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / fs / ext4 / inline.c
blobbae987549dc367736eaf0beeedb29e8e514e46e6
1 /*
2 * Copyright (c) 2012 Taobao.
3 * Written by Tao Ma <boyu.mt@taobao.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14 #include "ext4_jbd2.h"
15 #include "ext4.h"
16 #include "xattr.h"
17 #include "truncate.h"
18 #include <linux/fiemap.h>
19
20 #define EXT4_XATTR_SYSTEM_DATA "data"
21 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
22 #define EXT4_INLINE_DOTDOT_OFFSET 2
23 #define EXT4_INLINE_DOTDOT_SIZE 4
24
25 int ext4_get_inline_size(struct inode *inode)
26 {
27 if (EXT4_I(inode)->i_inline_off)
28 return EXT4_I(inode)->i_inline_size;
29
30 return 0;
31 }
32
33 static int get_max_inline_xattr_value_size(struct inode *inode,
34 struct ext4_iloc *iloc)
35 {
36 struct ext4_xattr_ibody_header *header;
37 struct ext4_xattr_entry *entry;
38 struct ext4_inode *raw_inode;
39 int free, min_offs;
40
41 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
42 EXT4_GOOD_OLD_INODE_SIZE -
43 EXT4_I(inode)->i_extra_isize -
44 sizeof(struct ext4_xattr_ibody_header);
45
46 /*
47 * We need to subtract another sizeof(__u32) since an in-inode xattr
48 * needs an empty 4 bytes to indicate the gap between the xattr entry
49 * and the name/value pair.
50 */
51 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
52 return EXT4_XATTR_SIZE(min_offs -
53 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
54 EXT4_XATTR_ROUND - sizeof(__u32));
55
56 raw_inode = ext4_raw_inode(iloc);
57 header = IHDR(inode, raw_inode);
58 entry = IFIRST(header);
59
60 /* Compute min_offs. */
61 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
62 if (!entry->e_value_block && entry->e_value_size) {
63 size_t offs = le16_to_cpu(entry->e_value_offs);
64 if (offs < min_offs)
65 min_offs = offs;
66 }
67 }
68 free = min_offs -
69 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
70
71 if (EXT4_I(inode)->i_inline_off) {
72 entry = (struct ext4_xattr_entry *)
73 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
74
75 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
76 goto out;
77 }
78
79 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
80
81 if (free > EXT4_XATTR_ROUND)
82 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
83 else
84 free = 0;
85
86 out:
87 return free;
88 }
89
90 /*
91 * Get the maximum size we now can store in an inode.
92 * If we can't find the space for a xattr entry, don't use the space
93 * of the extents since we have no space to indicate the inline data.
94 */
95 int ext4_get_max_inline_size(struct inode *inode)
96 {
97 int error, max_inline_size;
98 struct ext4_iloc iloc;
99
100 if (EXT4_I(inode)->i_extra_isize == 0)
101 return 0;
102
103 error = ext4_get_inode_loc(inode, &iloc);
104 if (error) {
105 ext4_error_inode(inode, __func__, __LINE__, 0,
106 "can't get inode location %lu",
107 inode->i_ino);
108 return 0;
109 }
110
111 down_read(&EXT4_I(inode)->xattr_sem);
112 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
113 up_read(&EXT4_I(inode)->xattr_sem);
114
115 brelse(iloc.bh);
116
117 if (!max_inline_size)
118 return 0;
119
120 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
121 }
122
123 int ext4_has_inline_data(struct inode *inode)
124 {
125 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
126 EXT4_I(inode)->i_inline_off;
127 }
128
129 /*
130 * this function does not take xattr_sem, which is OK because it is
131 * currently only used in a code path coming form ext4_iget, before
132 * the new inode has been unlocked
133 */
134 int ext4_find_inline_data_nolock(struct inode *inode)
135 {
136 struct ext4_xattr_ibody_find is = {
137 .s = { .not_found = -ENODATA, },
138 };
139 struct ext4_xattr_info i = {
140 .name_index = EXT4_XATTR_INDEX_SYSTEM,
141 .name = EXT4_XATTR_SYSTEM_DATA,
142 };
143 int error;
144
145 if (EXT4_I(inode)->i_extra_isize == 0)
146 return 0;
147
148 error = ext4_get_inode_loc(inode, &is.iloc);
149 if (error)
150 return error;
151
152 error = ext4_xattr_ibody_find(inode, &i, &is);
153 if (error)
154 goto out;
155
156 if (!is.s.not_found) {
157 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
158 (void *)ext4_raw_inode(&is.iloc));
159 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
160 le32_to_cpu(is.s.here->e_value_size);
161 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
162 }
163 out:
164 brelse(is.iloc.bh);
165 return error;
166 }
167
168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
169 unsigned int len,
170 struct ext4_iloc *iloc)
171 {
172 struct ext4_xattr_entry *entry;
173 struct ext4_xattr_ibody_header *header;
174 int cp_len = 0;
175 struct ext4_inode *raw_inode;
176
177 if (!len)
178 return 0;
179
180 BUG_ON(len > EXT4_I(inode)->i_inline_size);
181
182 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
183 len : EXT4_MIN_INLINE_DATA_SIZE;
184
185 raw_inode = ext4_raw_inode(iloc);
186 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
187
188 len -= cp_len;
189 buffer += cp_len;
190
191 if (!len)
192 goto out;
193
194 header = IHDR(inode, raw_inode);
195 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
196 EXT4_I(inode)->i_inline_off);
197 len = min_t(unsigned int, len,
198 (unsigned int)le32_to_cpu(entry->e_value_size));
199
200 memcpy(buffer,
201 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
202 cp_len += len;
203
204 out:
205 return cp_len;
206 }
207
208 /*
209 * write the buffer to the inline inode.
210 * If 'create' is set, we don't need to do the extra copy in the xattr
211 * value since it is already handled by ext4_xattr_ibody_inline_set.
212 * That saves us one memcpy.
213 */
214 void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
215 void *buffer, loff_t pos, unsigned int len)
216 {
217 struct ext4_xattr_entry *entry;
218 struct ext4_xattr_ibody_header *header;
219 struct ext4_inode *raw_inode;
220 int cp_len = 0;
221
222 BUG_ON(!EXT4_I(inode)->i_inline_off);
223 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
224
225 raw_inode = ext4_raw_inode(iloc);
226 buffer += pos;
227
228 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
229 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
230 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
231 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
232
233 len -= cp_len;
234 buffer += cp_len;
235 pos += cp_len;
236 }
237
238 if (!len)
239 return;
240
241 pos -= EXT4_MIN_INLINE_DATA_SIZE;
242 header = IHDR(inode, raw_inode);
243 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
244 EXT4_I(inode)->i_inline_off);
245
246 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
247 buffer, len);
248 }
249
250 static int ext4_create_inline_data(handle_t *handle,
251 struct inode *inode, unsigned len)
252 {
253 int error;
254 void *value = NULL;
255 struct ext4_xattr_ibody_find is = {
256 .s = { .not_found = -ENODATA, },
257 };
258 struct ext4_xattr_info i = {
259 .name_index = EXT4_XATTR_INDEX_SYSTEM,
260 .name = EXT4_XATTR_SYSTEM_DATA,
261 };
262
263 error = ext4_get_inode_loc(inode, &is.iloc);
264 if (error)
265 return error;
266
267 error = ext4_journal_get_write_access(handle, is.iloc.bh);
268 if (error)
269 goto out;
270
271 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
272 value = EXT4_ZERO_XATTR_VALUE;
273 len -= EXT4_MIN_INLINE_DATA_SIZE;
274 } else {
275 value = "";
276 len = 0;
277 }
278
279 /* Insert the the xttr entry. */
280 i.value = value;
281 i.value_len = len;
282
283 error = ext4_xattr_ibody_find(inode, &i, &is);
284 if (error)
285 goto out;
286
287 BUG_ON(!is.s.not_found);
288
289 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
290 if (error) {
291 if (error == -ENOSPC)
292 ext4_clear_inode_state(inode,
293 EXT4_STATE_MAY_INLINE_DATA);
294 goto out;
295 }
296
297 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
298 0, EXT4_MIN_INLINE_DATA_SIZE);
299
300 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
301 (void *)ext4_raw_inode(&is.iloc));
302 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
303 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
304 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
305 get_bh(is.iloc.bh);
306 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
307
308 out:
309 brelse(is.iloc.bh);
310 return error;
311 }
312
313 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
314 unsigned int len)
315 {
316 int error;
317 void *value = NULL;
318 struct ext4_xattr_ibody_find is = {
319 .s = { .not_found = -ENODATA, },
320 };
321 struct ext4_xattr_info i = {
322 .name_index = EXT4_XATTR_INDEX_SYSTEM,
323 .name = EXT4_XATTR_SYSTEM_DATA,
324 };
325
326 /* If the old space is ok, write the data directly. */
327 if (len <= EXT4_I(inode)->i_inline_size)
328 return 0;
329
330 error = ext4_get_inode_loc(inode, &is.iloc);
331 if (error)
332 return error;
333
334 error = ext4_xattr_ibody_find(inode, &i, &is);
335 if (error)
336 goto out;
337
338 BUG_ON(is.s.not_found);
339
340 len -= EXT4_MIN_INLINE_DATA_SIZE;
341 value = kzalloc(len, GFP_NOFS);
342 if (!value)
343 goto out;
344
345 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
346 value, len);
347 if (error == -ENODATA)
348 goto out;
349
350 error = ext4_journal_get_write_access(handle, is.iloc.bh);
351 if (error)
352 goto out;
353
354 /* Update the xttr entry. */
355 i.value = value;
356 i.value_len = len;
357
358 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
359 if (error)
360 goto out;
361
362 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
363 (void *)ext4_raw_inode(&is.iloc));
364 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
365 le32_to_cpu(is.s.here->e_value_size);
366 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
367 get_bh(is.iloc.bh);
368 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
369
370 out:
371 kfree(value);
372 brelse(is.iloc.bh);
373 return error;
374 }
375
376 int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
377 unsigned int len)
378 {
379 int ret, size;
380 struct ext4_inode_info *ei = EXT4_I(inode);
381
382 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
383 return -ENOSPC;
384
385 size = ext4_get_max_inline_size(inode);
386 if (size < len)
387 return -ENOSPC;
388
389 down_write(&EXT4_I(inode)->xattr_sem);
390
391 if (ei->i_inline_off)
392 ret = ext4_update_inline_data(handle, inode, len);
393 else
394 ret = ext4_create_inline_data(handle, inode, len);
395
396 up_write(&EXT4_I(inode)->xattr_sem);
397
398 return ret;
399 }
400
401 static int ext4_destroy_inline_data_nolock(handle_t *handle,
402 struct inode *inode)
403 {
404 struct ext4_inode_info *ei = EXT4_I(inode);
405 struct ext4_xattr_ibody_find is = {
406 .s = { .not_found = 0, },
407 };
408 struct ext4_xattr_info i = {
409 .name_index = EXT4_XATTR_INDEX_SYSTEM,
410 .name = EXT4_XATTR_SYSTEM_DATA,
411 .value = NULL,
412 .value_len = 0,
413 };
414 int error;
415
416 if (!ei->i_inline_off)
417 return 0;
418
419 error = ext4_get_inode_loc(inode, &is.iloc);
420 if (error)
421 return error;
422
423 error = ext4_xattr_ibody_find(inode, &i, &is);
424 if (error)
425 goto out;
426
427 error = ext4_journal_get_write_access(handle, is.iloc.bh);
428 if (error)
429 goto out;
430
431 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
432 if (error)
433 goto out;
434
435 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
436 0, EXT4_MIN_INLINE_DATA_SIZE);
437
438 if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
439 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
440 if (S_ISDIR(inode->i_mode) ||
441 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
442 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
443 ext4_ext_tree_init(handle, inode);
444 }
445 }
446 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
447
448 get_bh(is.iloc.bh);
449 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
450
451 EXT4_I(inode)->i_inline_off = 0;
452 EXT4_I(inode)->i_inline_size = 0;
453 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
454 out:
455 brelse(is.iloc.bh);
456 if (error == -ENODATA)
457 error = 0;
458 return error;
459 }
460
461 static int ext4_read_inline_page(struct inode *inode, struct page *page)
462 {
463 void *kaddr;
464 int ret = 0;
465 size_t len;
466 struct ext4_iloc iloc;
467
468 BUG_ON(!PageLocked(page));
469 BUG_ON(!ext4_has_inline_data(inode));
470 BUG_ON(page->index);
471
472 if (!EXT4_I(inode)->i_inline_off) {
473 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
474 inode->i_ino);
475 goto out;
476 }
477
478 ret = ext4_get_inode_loc(inode, &iloc);
479 if (ret)
480 goto out;
481
482 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
483 kaddr = kmap_atomic(page);
484 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
485 flush_dcache_page(page);
486 kunmap_atomic(kaddr);
487 zero_user_segment(page, len, PAGE_CACHE_SIZE);
488 SetPageUptodate(page);
489 brelse(iloc.bh);
490
491 out:
492 return ret;
493 }
494
495 int ext4_readpage_inline(struct inode *inode, struct page *page)
496 {
497 int ret = 0;
498
499 down_read(&EXT4_I(inode)->xattr_sem);
500 if (!ext4_has_inline_data(inode)) {
501 up_read(&EXT4_I(inode)->xattr_sem);
502 return -EAGAIN;
503 }
504
505 /*
506 * Current inline data can only exist in the 1st page,
507 * So for all the other pages, just set them uptodate.
508 */
509 if (!page->index)
510 ret = ext4_read_inline_page(inode, page);
511 else if (!PageUptodate(page)) {
512 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
513 SetPageUptodate(page);
514 }
515
516 up_read(&EXT4_I(inode)->xattr_sem);
517
518 unlock_page(page);
519 return ret >= 0 ? 0 : ret;
520 }
521
522 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
523 struct inode *inode,
524 unsigned flags)
525 {
526 int ret, needed_blocks;
527 handle_t *handle = NULL;
528 int retries = 0, sem_held = 0;
529 struct page *page = NULL;
530 unsigned from, to;
531 struct ext4_iloc iloc;
532
533 if (!ext4_has_inline_data(inode)) {
534 /*
535 * clear the flag so that no new write
536 * will trap here again.
537 */
538 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
539 return 0;
540 }
541
542 needed_blocks = ext4_writepage_trans_blocks(inode);
543
544 ret = ext4_get_inode_loc(inode, &iloc);
545 if (ret)
546 return ret;
547
548 retry:
549 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
550 if (IS_ERR(handle)) {
551 ret = PTR_ERR(handle);
552 handle = NULL;
553 goto out;
554 }
555
556 /* We cannot recurse into the filesystem as the transaction is already
557 * started */
558 flags |= AOP_FLAG_NOFS;
559
560 page = grab_cache_page_write_begin(mapping, 0, flags);
561 if (!page) {
562 ret = -ENOMEM;
563 goto out;
564 }
565
566 down_write(&EXT4_I(inode)->xattr_sem);
567 sem_held = 1;
568 /* If some one has already done this for us, just exit. */
569 if (!ext4_has_inline_data(inode)) {
570 ret = 0;
571 goto out;
572 }
573
574 from = 0;
575 to = ext4_get_inline_size(inode);
576 if (!PageUptodate(page)) {
577 ret = ext4_read_inline_page(inode, page);
578 if (ret < 0)
579 goto out;
580 }
581
582 ret = ext4_destroy_inline_data_nolock(handle, inode);
583 if (ret)
584 goto out;
585
586 if (ext4_should_dioread_nolock(inode))
587 ret = __block_write_begin(page, from, to, ext4_get_block_write);
588 else
589 ret = __block_write_begin(page, from, to, ext4_get_block);
590
591 if (!ret && ext4_should_journal_data(inode)) {
592 ret = ext4_walk_page_buffers(handle, page_buffers(page),
593 from, to, NULL,
594 do_journal_get_write_access);
595 }
596
597 if (ret) {
598 unlock_page(page);
599 page_cache_release(page);
600 ext4_orphan_add(handle, inode);
601 up_write(&EXT4_I(inode)->xattr_sem);
602 sem_held = 0;
603 ext4_journal_stop(handle);
604 handle = NULL;
605 ext4_truncate_failed_write(inode);
606 /*
607 * If truncate failed early the inode might
608 * still be on the orphan list; we need to
609 * make sure the inode is removed from the
610 * orphan list in that case.
611 */
612 if (inode->i_nlink)
613 ext4_orphan_del(NULL, inode);
614 }
615
616 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
617 goto retry;
618
619 block_commit_write(page, from, to);
620 out:
621 if (page) {
622 unlock_page(page);
623 page_cache_release(page);
624 }
625 if (sem_held)
626 up_write(&EXT4_I(inode)->xattr_sem);
627 if (handle)
628 ext4_journal_stop(handle);
629 brelse(iloc.bh);
630 return ret;
631 }
632
633 /*
634 * Try to write data in the inode.
635 * If the inode has inline data, check whether the new write can be
636 * in the inode also. If not, create the page the handle, move the data
637 * to the page make it update and let the later codes create extent for it.
638 */
639 int ext4_try_to_write_inline_data(struct address_space *mapping,
640 struct inode *inode,
641 loff_t pos, unsigned len,
642 unsigned flags,
643 struct page **pagep)
644 {
645 int ret;
646 handle_t *handle;
647 struct page *page;
648 struct ext4_iloc iloc;
649
650 if (pos + len > ext4_get_max_inline_size(inode))
651 goto convert;
652
653 ret = ext4_get_inode_loc(inode, &iloc);
654 if (ret)
655 return ret;
656
657 /*
658 * The possible write could happen in the inode,
659 * so try to reserve the space in inode first.
660 */
661 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
662 if (IS_ERR(handle)) {
663 ret = PTR_ERR(handle);
664 handle = NULL;
665 goto out;
666 }
667
668 ret = ext4_prepare_inline_data(handle, inode, pos + len);
669 if (ret && ret != -ENOSPC)
670 goto out;
671
672 /* We don't have space in inline inode, so convert it to extent. */
673 if (ret == -ENOSPC) {
674 ext4_journal_stop(handle);
675 brelse(iloc.bh);
676 goto convert;
677 }
678
679 flags |= AOP_FLAG_NOFS;
680
681 page = grab_cache_page_write_begin(mapping, 0, flags);
682 if (!page) {
683 ret = -ENOMEM;
684 goto out;
685 }
686
687 *pagep = page;
688 down_read(&EXT4_I(inode)->xattr_sem);
689 if (!ext4_has_inline_data(inode)) {
690 ret = 0;
691 unlock_page(page);
692 page_cache_release(page);
693 goto out_up_read;
694 }
695
696 if (!PageUptodate(page)) {
697 ret = ext4_read_inline_page(inode, page);
698 if (ret < 0)
699 goto out_up_read;
700 }
701
702 ret = 1;
703 handle = NULL;
704 out_up_read:
705 up_read(&EXT4_I(inode)->xattr_sem);
706 out:
707 if (handle)
708 ext4_journal_stop(handle);
709 brelse(iloc.bh);
710 return ret;
711 convert:
712 return ext4_convert_inline_data_to_extent(mapping,
713 inode, flags);
714 }
715
716 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
717 unsigned copied, struct page *page)
718 {
719 int ret;
720 void *kaddr;
721 struct ext4_iloc iloc;
722
723 if (unlikely(copied < len)) {
724 if (!PageUptodate(page)) {
725 copied = 0;
726 goto out;
727 }
728 }
729
730 ret = ext4_get_inode_loc(inode, &iloc);
731 if (ret) {
732 ext4_std_error(inode->i_sb, ret);
733 copied = 0;
734 goto out;
735 }
736
737 down_write(&EXT4_I(inode)->xattr_sem);
738 BUG_ON(!ext4_has_inline_data(inode));
739
740 kaddr = kmap_atomic(page);
741 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
742 kunmap_atomic(kaddr);
743 SetPageUptodate(page);
744 /* clear page dirty so that writepages wouldn't work for us. */
745 ClearPageDirty(page);
746
747 up_write(&EXT4_I(inode)->xattr_sem);
748 brelse(iloc.bh);
749 out:
750 return copied;
751 }
752
753 struct buffer_head *
754 ext4_journalled_write_inline_data(struct inode *inode,
755 unsigned len,
756 struct page *page)
757 {
758 int ret;
759 void *kaddr;
760 struct ext4_iloc iloc;
761
762 ret = ext4_get_inode_loc(inode, &iloc);
763 if (ret) {
764 ext4_std_error(inode->i_sb, ret);
765 return NULL;
766 }
767
768 down_write(&EXT4_I(inode)->xattr_sem);
769 kaddr = kmap_atomic(page);
770 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
771 kunmap_atomic(kaddr);
772 up_write(&EXT4_I(inode)->xattr_sem);
773
774 return iloc.bh;
775 }
776
777 /*
778 * Try to make the page cache and handle ready for the inline data case.
779 * We can call this function in 2 cases:
780 * 1. The inode is created and the first write exceeds inline size. We can
781 * clear the inode state safely.
782 * 2. The inode has inline data, then we need to read the data, make it
783 * update and dirty so that ext4_da_writepages can handle it. We don't
784 * need to start the journal since the file's metatdata isn't changed now.
785 */
786 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
787 struct inode *inode,
788 unsigned flags,
789 void **fsdata)
790 {
791 int ret = 0, inline_size;
792 struct page *page;
793
794 page = grab_cache_page_write_begin(mapping, 0, flags);
795 if (!page)
796 return -ENOMEM;
797
798 down_read(&EXT4_I(inode)->xattr_sem);
799 if (!ext4_has_inline_data(inode)) {
800 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
801 goto out;
802 }
803
804 inline_size = ext4_get_inline_size(inode);
805
806 if (!PageUptodate(page)) {
807 ret = ext4_read_inline_page(inode, page);
808 if (ret < 0)
809 goto out;
810 }
811
812 ret = __block_write_begin(page, 0, inline_size,
813 ext4_da_get_block_prep);
814 if (ret) {
815 ext4_truncate_failed_write(inode);
816 goto out;
817 }
818
819 SetPageDirty(page);
820 SetPageUptodate(page);
821 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
822 *fsdata = (void *)CONVERT_INLINE_DATA;
823
824 out:
825 up_read(&EXT4_I(inode)->xattr_sem);
826 if (page) {
827 unlock_page(page);
828 page_cache_release(page);
829 }
830 return ret;
831 }
832
833 /*
834 * Prepare the write for the inline data.
835 * If the the data can be written into the inode, we just read
836 * the page and make it uptodate, and start the journal.
837 * Otherwise read the page, makes it dirty so that it can be
838 * handle in writepages(the i_disksize update is left to the
839 * normal ext4_da_write_end).
840 */
841 int ext4_da_write_inline_data_begin(struct address_space *mapping,
842 struct inode *inode,
843 loff_t pos, unsigned len,
844 unsigned flags,
845 struct page **pagep,
846 void **fsdata)
847 {
848 int ret, inline_size;
849 handle_t *handle;
850 struct page *page;
851 struct ext4_iloc iloc;
852
853 ret = ext4_get_inode_loc(inode, &iloc);
854 if (ret)
855 return ret;
856
857 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
858 if (IS_ERR(handle)) {
859 ret = PTR_ERR(handle);
860 handle = NULL;
861 goto out;
862 }
863
864 inline_size = ext4_get_max_inline_size(inode);
865
866 ret = -ENOSPC;
867 if (inline_size >= pos + len) {
868 ret = ext4_prepare_inline_data(handle, inode, pos + len);
869 if (ret && ret != -ENOSPC)
870 goto out;
871 }
872
873 if (ret == -ENOSPC) {
874 ret = ext4_da_convert_inline_data_to_extent(mapping,
875 inode,
876 flags,
877 fsdata);
878 goto out;
879 }
880
881 /*
882 * We cannot recurse into the filesystem as the transaction
883 * is already started.
884 */
885 flags |= AOP_FLAG_NOFS;
886
887 page = grab_cache_page_write_begin(mapping, 0, flags);
888 if (!page) {
889 ret = -ENOMEM;
890 goto out;
891 }
892
893 down_read(&EXT4_I(inode)->xattr_sem);
894 if (!ext4_has_inline_data(inode)) {
895 ret = 0;
896 goto out_release_page;
897 }
898
899 if (!PageUptodate(page)) {
900 ret = ext4_read_inline_page(inode, page);
901 if (ret < 0)
902 goto out_release_page;
903 }
904
905 up_read(&EXT4_I(inode)->xattr_sem);
906 *pagep = page;
907 handle = NULL;
908 brelse(iloc.bh);
909 return 1;
910 out_release_page:
911 up_read(&EXT4_I(inode)->xattr_sem);
912 unlock_page(page);
913 page_cache_release(page);
914 out:
915 if (handle)
916 ext4_journal_stop(handle);
917 brelse(iloc.bh);
918 return ret;
919 }
920
921 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
922 unsigned len, unsigned copied,
923 struct page *page)
924 {
925 int i_size_changed = 0;
926
927 copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
928
929 /*
930 * No need to use i_size_read() here, the i_size
931 * cannot change under us because we hold i_mutex.
932 *
933 * But it's important to update i_size while still holding page lock:
934 * page writeout could otherwise come in and zero beyond i_size.
935 */
936 if (pos+copied > inode->i_size) {
937 i_size_write(inode, pos+copied);
938 i_size_changed = 1;
939 }
940 unlock_page(page);
941 page_cache_release(page);
942
943 /*
944 * Don't mark the inode dirty under page lock. First, it unnecessarily
945 * makes the holding time of page lock longer. Second, it forces lock
946 * ordering of page lock and transaction start for journaling
947 * filesystems.
948 */
949 if (i_size_changed)
950 mark_inode_dirty(inode);
951
952 return copied;
953 }
954
955 #ifdef INLINE_DIR_DEBUG
956 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
957 void *inline_start, int inline_size)
958 {
959 int offset;
960 unsigned short de_len;
961 struct ext4_dir_entry_2 *de = inline_start;
962 void *dlimit = inline_start + inline_size;
963
964 trace_printk("inode %lu\n", dir->i_ino);
965 offset = 0;
966 while ((void *)de < dlimit) {
967 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
968 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
969 offset, de_len, de->name_len, de->name,
970 de->name_len, le32_to_cpu(de->inode));
971 if (ext4_check_dir_entry(dir, NULL, de, bh,
972 inline_start, inline_size, offset))
973 BUG();
974
975 offset += de_len;
976 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
977 }
978 }
979 #else
980 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
981 #endif
982
983 /*
984 * Add a new entry into a inline dir.
985 * It will return -ENOSPC if no space is available, and -EIO
986 * and -EEXIST if directory entry already exists.
987 */
988 static int ext4_add_dirent_to_inline(handle_t *handle,
989 struct dentry *dentry,
990 struct inode *inode,
991 struct ext4_iloc *iloc,
992 void *inline_start, int inline_size)
993 {
994 struct inode *dir = dentry->d_parent->d_inode;
995 const char *name = dentry->d_name.name;
996 int namelen = dentry->d_name.len;
997 int err;
998 struct ext4_dir_entry_2 *de;
999
1000 err = ext4_find_dest_de(dir, inode, iloc->bh,
1001 inline_start, inline_size,
1002 name, namelen, &de);
1003 if (err)
1004 return err;
1005
1006 err = ext4_journal_get_write_access(handle, iloc->bh);
1007 if (err)
1008 return err;
1009 ext4_insert_dentry(inode, de, inline_size, name, namelen);
1010
1011 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1012
1013 /*
1014 * XXX shouldn't update any times until successful
1015 * completion of syscall, but too many callers depend
1016 * on this.
1017 *
1018 * XXX similarly, too many callers depend on
1019 * ext4_new_inode() setting the times, but error
1020 * recovery deletes the inode, so the worst that can
1021 * happen is that the times are slightly out of date
1022 * and/or different from the directory change time.
1023 */
1024 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1025 ext4_update_dx_flag(dir);
1026 dir->i_version++;
1027 ext4_mark_inode_dirty(handle, dir);
1028 return 1;
1029 }
1030
1031 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1032 struct ext4_iloc *iloc)
1033 {
1034 struct ext4_xattr_entry *entry;
1035 struct ext4_xattr_ibody_header *header;
1036
1037 BUG_ON(!EXT4_I(inode)->i_inline_off);
1038
1039 header = IHDR(inode, ext4_raw_inode(iloc));
1040 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1041 EXT4_I(inode)->i_inline_off);
1042
1043 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1044 }
1045
1046 /* Set the final de to cover the whole block. */
1047 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1048 {
1049 struct ext4_dir_entry_2 *de, *prev_de;
1050 void *limit;
1051 int de_len;
1052
1053 de = (struct ext4_dir_entry_2 *)de_buf;
1054 if (old_size) {
1055 limit = de_buf + old_size;
1056 do {
1057 prev_de = de;
1058 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1059 de_buf += de_len;
1060 de = (struct ext4_dir_entry_2 *)de_buf;
1061 } while (de_buf < limit);
1062
1063 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1064 old_size, new_size);
1065 } else {
1066 /* this is just created, so create an empty entry. */
1067 de->inode = 0;
1068 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1069 }
1070 }
1071
1072 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1073 struct ext4_iloc *iloc)
1074 {
1075 int ret;
1076 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1077 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1078
1079 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1080 return -ENOSPC;
1081
1082 ret = ext4_update_inline_data(handle, dir,
1083 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1084 if (ret)
1085 return ret;
1086
1087 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1088 EXT4_I(dir)->i_inline_size -
1089 EXT4_MIN_INLINE_DATA_SIZE);
1090 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1091 return 0;
1092 }
1093
1094 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1095 struct ext4_iloc *iloc,
1096 void *buf, int inline_size)
1097 {
1098 ext4_create_inline_data(handle, inode, inline_size);
1099 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1100 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1101 }
1102
1103 static int ext4_finish_convert_inline_dir(handle_t *handle,
1104 struct inode *inode,
1105 struct buffer_head *dir_block,
1106 void *buf,
1107 int inline_size)
1108 {
1109 int err, csum_size = 0, header_size = 0;
1110 struct ext4_dir_entry_2 *de;
1111 struct ext4_dir_entry_tail *t;
1112 void *target = dir_block->b_data;
1113
1114 /*
1115 * First create "." and ".." and then copy the dir information
1116 * back to the block.
1117 */
1118 de = (struct ext4_dir_entry_2 *)target;
1119 de = ext4_init_dot_dotdot(inode, de,
1120 inode->i_sb->s_blocksize, csum_size,
1121 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1122 header_size = (void *)de - target;
1123
1124 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1125 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1126
1127 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1128 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1129 csum_size = sizeof(struct ext4_dir_entry_tail);
1130
1131 inode->i_size = inode->i_sb->s_blocksize;
1132 i_size_write(inode, inode->i_sb->s_blocksize);
1133 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1134 ext4_update_final_de(dir_block->b_data,
1135 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1136 inode->i_sb->s_blocksize - csum_size);
1137
1138 if (csum_size) {
1139 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1140 inode->i_sb->s_blocksize);
1141 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1142 }
1143 set_buffer_uptodate(dir_block);
1144 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1145 if (err)
1146 goto out;
1147 set_buffer_verified(dir_block);
1148 out:
1149 return err;
1150 }
1151
1152 static int ext4_convert_inline_data_nolock(handle_t *handle,
1153 struct inode *inode,
1154 struct ext4_iloc *iloc)
1155 {
1156 int error;
1157 void *buf = NULL;
1158 struct buffer_head *data_bh = NULL;
1159 struct ext4_map_blocks map;
1160 int inline_size;
1161
1162 inline_size = ext4_get_inline_size(inode);
1163 buf = kmalloc(inline_size, GFP_NOFS);
1164 if (!buf) {
1165 error = -ENOMEM;
1166 goto out;
1167 }
1168
1169 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1170 if (error < 0)
1171 goto out;
1172
1173 error = ext4_destroy_inline_data_nolock(handle, inode);
1174 if (error)
1175 goto out;
1176
1177 map.m_lblk = 0;
1178 map.m_len = 1;
1179 map.m_flags = 0;
1180 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1181 if (error < 0)
1182 goto out_restore;
1183 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1184 error = -EIO;
1185 goto out_restore;
1186 }
1187
1188 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1189 if (!data_bh) {
1190 error = -ENOMEM;
1191 goto out_restore;
1192 }
1193
1194 lock_buffer(data_bh);
1195 error = ext4_journal_get_create_access(handle, data_bh);
1196 if (error) {
1197 unlock_buffer(data_bh);
1198 error = -EIO;
1199 goto out_restore;
1200 }
1201 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1202
1203 if (!S_ISDIR(inode->i_mode)) {
1204 memcpy(data_bh->b_data, buf, inline_size);
1205 set_buffer_uptodate(data_bh);
1206 error = ext4_handle_dirty_metadata(handle,
1207 inode, data_bh);
1208 } else {
1209 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1210 buf, inline_size);
1211 }
1212
1213 unlock_buffer(data_bh);
1214 out_restore:
1215 if (error)
1216 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1217
1218 out:
1219 brelse(data_bh);
1220 kfree(buf);
1221 return error;
1222 }
1223
1224 /*
1225 * Try to add the new entry to the inline data.
1226 * If succeeds, return 0. If not, extended the inline dir and copied data to
1227 * the new created block.
1228 */
1229 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1230 struct inode *inode)
1231 {
1232 int ret, inline_size;
1233 void *inline_start;
1234 struct ext4_iloc iloc;
1235 struct inode *dir = dentry->d_parent->d_inode;
1236
1237 ret = ext4_get_inode_loc(dir, &iloc);
1238 if (ret)
1239 return ret;
1240
1241 down_write(&EXT4_I(dir)->xattr_sem);
1242 if (!ext4_has_inline_data(dir))
1243 goto out;
1244
1245 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1246 EXT4_INLINE_DOTDOT_SIZE;
1247 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1248
1249 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1250 inline_start, inline_size);
1251 if (ret != -ENOSPC)
1252 goto out;
1253
1254 /* check whether it can be inserted to inline xattr space. */
1255 inline_size = EXT4_I(dir)->i_inline_size -
1256 EXT4_MIN_INLINE_DATA_SIZE;
1257 if (!inline_size) {
1258 /* Try to use the xattr space.*/
1259 ret = ext4_update_inline_dir(handle, dir, &iloc);
1260 if (ret && ret != -ENOSPC)
1261 goto out;
1262
1263 inline_size = EXT4_I(dir)->i_inline_size -
1264 EXT4_MIN_INLINE_DATA_SIZE;
1265 }
1266
1267 if (inline_size) {
1268 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1269
1270 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1271 inline_start, inline_size);
1272
1273 if (ret != -ENOSPC)
1274 goto out;
1275 }
1276
1277 /*
1278 * The inline space is filled up, so create a new block for it.
1279 * As the extent tree will be created, we have to save the inline
1280 * dir first.
1281 */
1282 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1283
1284 out:
1285 ext4_mark_inode_dirty(handle, dir);
1286 up_write(&EXT4_I(dir)->xattr_sem);
1287 brelse(iloc.bh);
1288 return ret;
1289 }
1290
1291 /*
1292 * This function fills a red-black tree with information from an
1293 * inlined dir. It returns the number directory entries loaded
1294 * into the tree. If there is an error it is returned in err.
1295 */
1296 int htree_inlinedir_to_tree(struct file *dir_file,
1297 struct inode *dir, ext4_lblk_t block,
1298 struct dx_hash_info *hinfo,
1299 __u32 start_hash, __u32 start_minor_hash,
1300 int *has_inline_data)
1301 {
1302 int err = 0, count = 0;
1303 unsigned int parent_ino;
1304 int pos;
1305 struct ext4_dir_entry_2 *de;
1306 struct inode *inode = file_inode(dir_file);
1307 int ret, inline_size = 0;
1308 struct ext4_iloc iloc;
1309 void *dir_buf = NULL;
1310 struct ext4_dir_entry_2 fake;
1311
1312 ret = ext4_get_inode_loc(inode, &iloc);
1313 if (ret)
1314 return ret;
1315
1316 down_read(&EXT4_I(inode)->xattr_sem);
1317 if (!ext4_has_inline_data(inode)) {
1318 up_read(&EXT4_I(inode)->xattr_sem);
1319 *has_inline_data = 0;
1320 goto out;
1321 }
1322
1323 inline_size = ext4_get_inline_size(inode);
1324 dir_buf = kmalloc(inline_size, GFP_NOFS);
1325 if (!dir_buf) {
1326 ret = -ENOMEM;
1327 up_read(&EXT4_I(inode)->xattr_sem);
1328 goto out;
1329 }
1330
1331 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1332 up_read(&EXT4_I(inode)->xattr_sem);
1333 if (ret < 0)
1334 goto out;
1335
1336 pos = 0;
1337 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1338 while (pos < inline_size) {
1339 /*
1340 * As inlined dir doesn't store any information about '.' and
1341 * only the inode number of '..' is stored, we have to handle
1342 * them differently.
1343 */
1344 if (pos == 0) {
1345 fake.inode = cpu_to_le32(inode->i_ino);
1346 fake.name_len = 1;
1347 strcpy(fake.name, ".");
1348 fake.rec_len = ext4_rec_len_to_disk(
1349 EXT4_DIR_REC_LEN(fake.name_len),
1350 inline_size);
1351 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1352 de = &fake;
1353 pos = EXT4_INLINE_DOTDOT_OFFSET;
1354 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1355 fake.inode = cpu_to_le32(parent_ino);
1356 fake.name_len = 2;
1357 strcpy(fake.name, "..");
1358 fake.rec_len = ext4_rec_len_to_disk(
1359 EXT4_DIR_REC_LEN(fake.name_len),
1360 inline_size);
1361 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1362 de = &fake;
1363 pos = EXT4_INLINE_DOTDOT_SIZE;
1364 } else {
1365 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1366 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1367 if (ext4_check_dir_entry(inode, dir_file, de,
1368 iloc.bh, dir_buf,
1369 inline_size, pos)) {
1370 ret = count;
1371 goto out;
1372 }
1373 }
1374
1375 ext4fs_dirhash(de->name, de->name_len, hinfo);
1376 if ((hinfo->hash < start_hash) ||
1377 ((hinfo->hash == start_hash) &&
1378 (hinfo->minor_hash < start_minor_hash)))
1379 continue;
1380 if (de->inode == 0)
1381 continue;
1382 err = ext4_htree_store_dirent(dir_file,
1383 hinfo->hash, hinfo->minor_hash, de);
1384 if (err) {
1385 count = err;
1386 goto out;
1387 }
1388 count++;
1389 }
1390 ret = count;
1391 out:
1392 kfree(dir_buf);
1393 brelse(iloc.bh);
1394 return ret;
1395 }
1396
1397 /*
1398 * So this function is called when the volume is mkfsed with
1399 * dir_index disabled. In order to keep f_pos persistent
1400 * after we convert from an inlined dir to a blocked based,
1401 * we just pretend that we are a normal dir and return the
1402 * offset as if '.' and '..' really take place.
1403 *
1404 */
1405 int ext4_read_inline_dir(struct file *file,
1406 struct dir_context *ctx,
1407 int *has_inline_data)
1408 {
1409 unsigned int offset, parent_ino;
1410 int i;
1411 struct ext4_dir_entry_2 *de;
1412 struct super_block *sb;
1413 struct inode *inode = file_inode(file);
1414 int ret, inline_size = 0;
1415 struct ext4_iloc iloc;
1416 void *dir_buf = NULL;
1417 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1418
1419 ret = ext4_get_inode_loc(inode, &iloc);
1420 if (ret)
1421 return ret;
1422
1423 down_read(&EXT4_I(inode)->xattr_sem);
1424 if (!ext4_has_inline_data(inode)) {
1425 up_read(&EXT4_I(inode)->xattr_sem);
1426 *has_inline_data = 0;
1427 goto out;
1428 }
1429
1430 inline_size = ext4_get_inline_size(inode);
1431 dir_buf = kmalloc(inline_size, GFP_NOFS);
1432 if (!dir_buf) {
1433 ret = -ENOMEM;
1434 up_read(&EXT4_I(inode)->xattr_sem);
1435 goto out;
1436 }
1437
1438 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1439 up_read(&EXT4_I(inode)->xattr_sem);
1440 if (ret < 0)
1441 goto out;
1442
1443 ret = 0;
1444 sb = inode->i_sb;
1445 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1446 offset = ctx->pos;
1447
1448 /*
1449 * dotdot_offset and dotdot_size is the real offset and
1450 * size for ".." and "." if the dir is block based while
1451 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1452 * So we will use extra_offset and extra_size to indicate them
1453 * during the inline dir iteration.
1454 */
1455 dotdot_offset = EXT4_DIR_REC_LEN(1);
1456 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1457 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1458 extra_size = extra_offset + inline_size;
1459
1460 /*
1461 * If the version has changed since the last call to
1462 * readdir(2), then we might be pointing to an invalid
1463 * dirent right now. Scan from the start of the inline
1464 * dir to make sure.
1465 */
1466 if (file->f_version != inode->i_version) {
1467 for (i = 0; i < extra_size && i < offset;) {
1468 /*
1469 * "." is with offset 0 and
1470 * ".." is dotdot_offset.
1471 */
1472 if (!i) {
1473 i = dotdot_offset;
1474 continue;
1475 } else if (i == dotdot_offset) {
1476 i = dotdot_size;
1477 continue;
1478 }
1479 /* for other entry, the real offset in
1480 * the buf has to be tuned accordingly.
1481 */
1482 de = (struct ext4_dir_entry_2 *)
1483 (dir_buf + i - extra_offset);
1484 /* It's too expensive to do a full
1485 * dirent test each time round this
1486 * loop, but we do have to test at
1487 * least that it is non-zero. A
1488 * failure will be detected in the
1489 * dirent test below. */
1490 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1491 < EXT4_DIR_REC_LEN(1))
1492 break;
1493 i += ext4_rec_len_from_disk(de->rec_len,
1494 extra_size);
1495 }
1496 offset = i;
1497 ctx->pos = offset;
1498 file->f_version = inode->i_version;
1499 }
1500
1501 while (ctx->pos < extra_size) {
1502 if (ctx->pos == 0) {
1503 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1504 goto out;
1505 ctx->pos = dotdot_offset;
1506 continue;
1507 }
1508
1509 if (ctx->pos == dotdot_offset) {
1510 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1511 goto out;
1512 ctx->pos = dotdot_size;
1513 continue;
1514 }
1515
1516 de = (struct ext4_dir_entry_2 *)
1517 (dir_buf + ctx->pos - extra_offset);
1518 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1519 extra_size, ctx->pos))
1520 goto out;
1521 if (le32_to_cpu(de->inode)) {
1522 if (!dir_emit(ctx, de->name, de->name_len,
1523 le32_to_cpu(de->inode),
1524 get_dtype(sb, de->file_type)))
1525 goto out;
1526 }
1527 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1528 }
1529 out:
1530 kfree(dir_buf);
1531 brelse(iloc.bh);
1532 return ret;
1533 }
1534
1535 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1536 struct ext4_dir_entry_2 **parent_de,
1537 int *retval)
1538 {
1539 struct ext4_iloc iloc;
1540
1541 *retval = ext4_get_inode_loc(inode, &iloc);
1542 if (*retval)
1543 return NULL;
1544
1545 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1546
1547 return iloc.bh;
1548 }
1549
1550 /*
1551 * Try to create the inline data for the new dir.
1552 * If it succeeds, return 0, otherwise return the error.
1553 * In case of ENOSPC, the caller should create the normal disk layout dir.
1554 */
1555 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1556 struct inode *inode)
1557 {
1558 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1559 struct ext4_iloc iloc;
1560 struct ext4_dir_entry_2 *de;
1561
1562 ret = ext4_get_inode_loc(inode, &iloc);
1563 if (ret)
1564 return ret;
1565
1566 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1567 if (ret)
1568 goto out;
1569
1570 /*
1571 * For inline dir, we only save the inode information for the ".."
1572 * and create a fake dentry to cover the left space.
1573 */
1574 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1575 de->inode = cpu_to_le32(parent->i_ino);
1576 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1577 de->inode = 0;
1578 de->rec_len = ext4_rec_len_to_disk(
1579 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1580 inline_size);
1581 set_nlink(inode, 2);
1582 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1583 out:
1584 brelse(iloc.bh);
1585 return ret;
1586 }
1587
1588 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1589 const struct qstr *d_name,
1590 struct ext4_dir_entry_2 **res_dir,
1591 int *has_inline_data)
1592 {
1593 int ret;
1594 struct ext4_iloc iloc;
1595 void *inline_start;
1596 int inline_size;
1597
1598 if (ext4_get_inode_loc(dir, &iloc))
1599 return NULL;
1600
1601 down_read(&EXT4_I(dir)->xattr_sem);
1602 if (!ext4_has_inline_data(dir)) {
1603 *has_inline_data = 0;
1604 goto out;
1605 }
1606
1607 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1608 EXT4_INLINE_DOTDOT_SIZE;
1609 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1610 ret = search_dir(iloc.bh, inline_start, inline_size,
1611 dir, d_name, 0, res_dir);
1612 if (ret == 1)
1613 goto out_find;
1614 if (ret < 0)
1615 goto out;
1616
1617 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1618 goto out;
1619
1620 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1621 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1622
1623 ret = search_dir(iloc.bh, inline_start, inline_size,
1624 dir, d_name, 0, res_dir);
1625 if (ret == 1)
1626 goto out_find;
1627
1628 out:
1629 brelse(iloc.bh);
1630 iloc.bh = NULL;
1631 out_find:
1632 up_read(&EXT4_I(dir)->xattr_sem);
1633 return iloc.bh;
1634 }
1635
1636 int ext4_delete_inline_entry(handle_t *handle,
1637 struct inode *dir,
1638 struct ext4_dir_entry_2 *de_del,
1639 struct buffer_head *bh,
1640 int *has_inline_data)
1641 {
1642 int err, inline_size;
1643 struct ext4_iloc iloc;
1644 void *inline_start;
1645
1646 err = ext4_get_inode_loc(dir, &iloc);
1647 if (err)
1648 return err;
1649
1650 down_write(&EXT4_I(dir)->xattr_sem);
1651 if (!ext4_has_inline_data(dir)) {
1652 *has_inline_data = 0;
1653 goto out;
1654 }
1655
1656 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1657 EXT4_MIN_INLINE_DATA_SIZE) {
1658 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1659 EXT4_INLINE_DOTDOT_SIZE;
1660 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1661 EXT4_INLINE_DOTDOT_SIZE;
1662 } else {
1663 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1664 inline_size = ext4_get_inline_size(dir) -
1665 EXT4_MIN_INLINE_DATA_SIZE;
1666 }
1667
1668 err = ext4_journal_get_write_access(handle, bh);
1669 if (err)
1670 goto out;
1671
1672 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1673 inline_start, inline_size, 0);
1674 if (err)
1675 goto out;
1676
1677 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1678 err = ext4_mark_inode_dirty(handle, dir);
1679 if (unlikely(err))
1680 goto out;
1681
1682 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1683 out:
1684 up_write(&EXT4_I(dir)->xattr_sem);
1685 brelse(iloc.bh);
1686 if (err != -ENOENT)
1687 ext4_std_error(dir->i_sb, err);
1688 return err;
1689 }
1690
1691 /*
1692 * Get the inline dentry at offset.
1693 */
1694 static inline struct ext4_dir_entry_2 *
1695 ext4_get_inline_entry(struct inode *inode,
1696 struct ext4_iloc *iloc,
1697 unsigned int offset,
1698 void **inline_start,
1699 int *inline_size)
1700 {
1701 void *inline_pos;
1702
1703 BUG_ON(offset > ext4_get_inline_size(inode));
1704
1705 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1706 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1707 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1708 } else {
1709 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1710 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1711 *inline_size = ext4_get_inline_size(inode) -
1712 EXT4_MIN_INLINE_DATA_SIZE;
1713 }
1714
1715 if (inline_start)
1716 *inline_start = inline_pos;
1717 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1718 }
1719
1720 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1721 {
1722 int err, inline_size;
1723 struct ext4_iloc iloc;
1724 void *inline_pos;
1725 unsigned int offset;
1726 struct ext4_dir_entry_2 *de;
1727 int ret = 1;
1728
1729 err = ext4_get_inode_loc(dir, &iloc);
1730 if (err) {
1731 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1732 err, dir->i_ino);
1733 return 1;
1734 }
1735
1736 down_read(&EXT4_I(dir)->xattr_sem);
1737 if (!ext4_has_inline_data(dir)) {
1738 *has_inline_data = 0;
1739 goto out;
1740 }
1741
1742 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1743 if (!le32_to_cpu(de->inode)) {
1744 ext4_warning(dir->i_sb,
1745 "bad inline directory (dir #%lu) - no `..'",
1746 dir->i_ino);
1747 ret = 1;
1748 goto out;
1749 }
1750
1751 offset = EXT4_INLINE_DOTDOT_SIZE;
1752 while (offset < dir->i_size) {
1753 de = ext4_get_inline_entry(dir, &iloc, offset,
1754 &inline_pos, &inline_size);
1755 if (ext4_check_dir_entry(dir, NULL, de,
1756 iloc.bh, inline_pos,
1757 inline_size, offset)) {
1758 ext4_warning(dir->i_sb,
1759 "bad inline directory (dir #%lu) - "
1760 "inode %u, rec_len %u, name_len %d"
1761 "inline size %d\n",
1762 dir->i_ino, le32_to_cpu(de->inode),
1763 le16_to_cpu(de->rec_len), de->name_len,
1764 inline_size);
1765 ret = 1;
1766 goto out;
1767 }
1768 if (le32_to_cpu(de->inode)) {
1769 ret = 0;
1770 goto out;
1771 }
1772 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1773 }
1774
1775 out:
1776 up_read(&EXT4_I(dir)->xattr_sem);
1777 brelse(iloc.bh);
1778 return ret;
1779 }
1780
1781 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1782 {
1783 int ret;
1784
1785 down_write(&EXT4_I(inode)->xattr_sem);
1786 ret = ext4_destroy_inline_data_nolock(handle, inode);
1787 up_write(&EXT4_I(inode)->xattr_sem);
1788
1789 return ret;
1790 }
1791
1792 int ext4_inline_data_fiemap(struct inode *inode,
1793 struct fiemap_extent_info *fieinfo,
1794 int *has_inline)
1795 {
1796 __u64 physical = 0;
1797 __u64 length;
1798 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1799 int error = 0;
1800 struct ext4_iloc iloc;
1801
1802 down_read(&EXT4_I(inode)->xattr_sem);
1803 if (!ext4_has_inline_data(inode)) {
1804 *has_inline = 0;
1805 goto out;
1806 }
1807
1808 error = ext4_get_inode_loc(inode, &iloc);
1809 if (error)
1810 goto out;
1811
1812 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1813 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1814 physical += offsetof(struct ext4_inode, i_block);
1815 length = i_size_read(inode);
1816
1817 if (physical)
1818 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1819 length, flags);
1820 brelse(iloc.bh);
1821 out:
1822 up_read(&EXT4_I(inode)->xattr_sem);
1823 return (error < 0 ? error : 0);
1824 }
1825
1826 /*
1827 * Called during xattr set, and if we can sparse space 'needed',
1828 * just create the extent tree evict the data to the outer block.
1829 *
1830 * We use jbd2 instead of page cache to move data to the 1st block
1831 * so that the whole transaction can be committed as a whole and
1832 * the data isn't lost because of the delayed page cache write.
1833 */
1834 int ext4_try_to_evict_inline_data(handle_t *handle,
1835 struct inode *inode,
1836 int needed)
1837 {
1838 int error;
1839 struct ext4_xattr_entry *entry;
1840 struct ext4_xattr_ibody_header *header;
1841 struct ext4_inode *raw_inode;
1842 struct ext4_iloc iloc;
1843
1844 error = ext4_get_inode_loc(inode, &iloc);
1845 if (error)
1846 return error;
1847
1848 raw_inode = ext4_raw_inode(&iloc);
1849 header = IHDR(inode, raw_inode);
1850 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1851 EXT4_I(inode)->i_inline_off);
1852 if (EXT4_XATTR_LEN(entry->e_name_len) +
1853 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1854 error = -ENOSPC;
1855 goto out;
1856 }
1857
1858 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1859 out:
1860 brelse(iloc.bh);
1861 return error;
1862 }
1863
1864 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1865 {
1866 handle_t *handle;
1867 int inline_size, value_len, needed_blocks;
1868 size_t i_size;
1869 void *value = NULL;
1870 struct ext4_xattr_ibody_find is = {
1871 .s = { .not_found = -ENODATA, },
1872 };
1873 struct ext4_xattr_info i = {
1874 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1875 .name = EXT4_XATTR_SYSTEM_DATA,
1876 };
1877
1878
1879 needed_blocks = ext4_writepage_trans_blocks(inode);
1880 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1881 if (IS_ERR(handle))
1882 return;
1883
1884 down_write(&EXT4_I(inode)->xattr_sem);
1885 if (!ext4_has_inline_data(inode)) {
1886 *has_inline = 0;
1887 ext4_journal_stop(handle);
1888 return;
1889 }
1890
1891 if (ext4_orphan_add(handle, inode))
1892 goto out;
1893
1894 if (ext4_get_inode_loc(inode, &is.iloc))
1895 goto out;
1896
1897 down_write(&EXT4_I(inode)->i_data_sem);
1898 i_size = inode->i_size;
1899 inline_size = ext4_get_inline_size(inode);
1900 EXT4_I(inode)->i_disksize = i_size;
1901
1902 if (i_size < inline_size) {
1903 /* Clear the content in the xattr space. */
1904 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1905 if (ext4_xattr_ibody_find(inode, &i, &is))
1906 goto out_error;
1907
1908 BUG_ON(is.s.not_found);
1909
1910 value_len = le32_to_cpu(is.s.here->e_value_size);
1911 value = kmalloc(value_len, GFP_NOFS);
1912 if (!value)
1913 goto out_error;
1914
1915 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1916 value, value_len))
1917 goto out_error;
1918
1919 i.value = value;
1920 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1921 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1922 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1923 goto out_error;
1924 }
1925
1926 /* Clear the content within i_blocks. */
1927 if (i_size < EXT4_MIN_INLINE_DATA_SIZE)
1928 memset(ext4_raw_inode(&is.iloc)->i_block + i_size, 0,
1929 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1930
1931 EXT4_I(inode)->i_inline_size = i_size <
1932 EXT4_MIN_INLINE_DATA_SIZE ?
1933 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1934 }
1935
1936 out_error:
1937 up_write(&EXT4_I(inode)->i_data_sem);
1938 out:
1939 brelse(is.iloc.bh);
1940 up_write(&EXT4_I(inode)->xattr_sem);
1941 kfree(value);
1942 if (inode->i_nlink)
1943 ext4_orphan_del(handle, inode);
1944
1945 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1946 ext4_mark_inode_dirty(handle, inode);
1947 if (IS_SYNC(inode))
1948 ext4_handle_sync(handle);
1949
1950 ext4_journal_stop(handle);
1951 return;
1952 }
1953
1954 int ext4_convert_inline_data(struct inode *inode)
1955 {
1956 int error, needed_blocks;
1957 handle_t *handle;
1958 struct ext4_iloc iloc;
1959
1960 if (!ext4_has_inline_data(inode)) {
1961 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1962 return 0;
1963 }
1964
1965 needed_blocks = ext4_writepage_trans_blocks(inode);
1966
1967 iloc.bh = NULL;
1968 error = ext4_get_inode_loc(inode, &iloc);
1969 if (error)
1970 return error;
1971
1972 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1973 if (IS_ERR(handle)) {
1974 error = PTR_ERR(handle);
1975 goto out_free;
1976 }
1977
1978 down_write(&EXT4_I(inode)->xattr_sem);
1979 if (!ext4_has_inline_data(inode)) {
1980 up_write(&EXT4_I(inode)->xattr_sem);
1981 goto out;
1982 }
1983
1984 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1985 up_write(&EXT4_I(inode)->xattr_sem);
1986 out:
1987 ext4_journal_stop(handle);
1988 out_free:
1989 brelse(iloc.bh);
1990 return error;
1991 }
Linus' kernel tree