1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 * Copyright (c) 2012 Taobao.
4 * Written by Tao Ma <boyu.mt@taobao.com>
5 */
6
7 #include <linux/iomap.h>
8 #include <linux/fiemap.h>
9 #include <linux/iversion.h>
10
11 #include "ext4_jbd2.h"
12 #include "ext4.h"
13 #include "xattr.h"
14 #include "truncate.h"
15
16 #define EXT4_XATTR_SYSTEM_DATA "data"
17 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
18 #define EXT4_INLINE_DOTDOT_OFFSET 2
19 #define EXT4_INLINE_DOTDOT_SIZE 4
20
ext4_get_inline_size(struct inode * inode)21 static int ext4_get_inline_size(struct inode *inode)
22 {
23 if (EXT4_I(inode)->i_inline_off)
24 return EXT4_I(inode)->i_inline_size;
25
26 return 0;
27 }
28
get_max_inline_xattr_value_size(struct inode * inode,struct ext4_iloc * iloc)29 static int get_max_inline_xattr_value_size(struct inode *inode,
30 struct ext4_iloc *iloc)
31 {
32 struct ext4_xattr_ibody_header *header;
33 struct ext4_xattr_entry *entry;
34 struct ext4_inode *raw_inode;
35 int free, min_offs;
36
37 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
38 EXT4_GOOD_OLD_INODE_SIZE -
39 EXT4_I(inode)->i_extra_isize -
40 sizeof(struct ext4_xattr_ibody_header);
41
42 /*
43 * We need to subtract another sizeof(__u32) since an in-inode xattr
44 * needs an empty 4 bytes to indicate the gap between the xattr entry
45 * and the name/value pair.
46 */
47 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
48 return EXT4_XATTR_SIZE(min_offs -
49 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
50 EXT4_XATTR_ROUND - sizeof(__u32));
51
52 raw_inode = ext4_raw_inode(iloc);
53 header = IHDR(inode, raw_inode);
54 entry = IFIRST(header);
55
56 /* Compute min_offs. */
57 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
58 if (!entry->e_value_inum && entry->e_value_size) {
59 size_t offs = le16_to_cpu(entry->e_value_offs);
60 if (offs < min_offs)
61 min_offs = offs;
62 }
63 }
64 free = min_offs -
65 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
66
67 if (EXT4_I(inode)->i_inline_off) {
68 entry = (struct ext4_xattr_entry *)
69 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
70
71 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
72 goto out;
73 }
74
75 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
76
77 if (free > EXT4_XATTR_ROUND)
78 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
79 else
80 free = 0;
81
82 out:
83 return free;
84 }
85
86 /*
87 * Get the maximum size we now can store in an inode.
88 * If we can't find the space for a xattr entry, don't use the space
89 * of the extents since we have no space to indicate the inline data.
90 */
ext4_get_max_inline_size(struct inode * inode)91 int ext4_get_max_inline_size(struct inode *inode)
92 {
93 int error, max_inline_size;
94 struct ext4_iloc iloc;
95
96 if (EXT4_I(inode)->i_extra_isize == 0)
97 return 0;
98
99 error = ext4_get_inode_loc(inode, &iloc);
100 if (error) {
101 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
102 "can't get inode location %lu",
103 inode->i_ino);
104 return 0;
105 }
106
107 down_read(&EXT4_I(inode)->xattr_sem);
108 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
109 up_read(&EXT4_I(inode)->xattr_sem);
110
111 brelse(iloc.bh);
112
113 if (!max_inline_size)
114 return 0;
115
116 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
117 }
118
119 /*
120 * this function does not take xattr_sem, which is OK because it is
121 * currently only used in a code path coming form ext4_iget, before
122 * the new inode has been unlocked
123 */
ext4_find_inline_data_nolock(struct inode * inode)124 int ext4_find_inline_data_nolock(struct inode *inode)
125 {
126 struct ext4_xattr_ibody_find is = {
127 .s = { .not_found = -ENODATA, },
128 };
129 struct ext4_xattr_info i = {
130 .name_index = EXT4_XATTR_INDEX_SYSTEM,
131 .name = EXT4_XATTR_SYSTEM_DATA,
132 };
133 int error;
134
135 if (EXT4_I(inode)->i_extra_isize == 0)
136 return 0;
137
138 error = ext4_get_inode_loc(inode, &is.iloc);
139 if (error)
140 return error;
141
142 error = ext4_xattr_ibody_find(inode, &i, &is);
143 if (error)
144 goto out;
145
146 if (!is.s.not_found) {
147 if (is.s.here->e_value_inum) {
148 EXT4_ERROR_INODE(inode, "inline data xattr refers "
149 "to an external xattr inode");
150 error = -EFSCORRUPTED;
151 goto out;
152 }
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
ext4_read_inline_data(struct inode * inode,void * buffer,unsigned int len,struct ext4_iloc * iloc)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 */
ext4_write_inline_data(struct inode * inode,struct ext4_iloc * iloc,void * buffer,loff_t pos,unsigned int len)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 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
219 return;
220
221 BUG_ON(!EXT4_I(inode)->i_inline_off);
222 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
223
224 raw_inode = ext4_raw_inode(iloc);
225 buffer += pos;
226
227 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
228 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
229 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
230 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
231
232 len -= cp_len;
233 buffer += cp_len;
234 pos += cp_len;
235 }
236
237 if (!len)
238 return;
239
240 pos -= EXT4_MIN_INLINE_DATA_SIZE;
241 header = IHDR(inode, raw_inode);
242 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
243 EXT4_I(inode)->i_inline_off);
244
245 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
246 buffer, len);
247 }
248
ext4_create_inline_data(handle_t * handle,struct inode * inode,unsigned len)249 static int ext4_create_inline_data(handle_t *handle,
250 struct inode *inode, unsigned len)
251 {
252 int error;
253 void *value = NULL;
254 struct ext4_xattr_ibody_find is = {
255 .s = { .not_found = -ENODATA, },
256 };
257 struct ext4_xattr_info i = {
258 .name_index = EXT4_XATTR_INDEX_SYSTEM,
259 .name = EXT4_XATTR_SYSTEM_DATA,
260 };
261
262 error = ext4_get_inode_loc(inode, &is.iloc);
263 if (error)
264 return error;
265
266 BUFFER_TRACE(is.iloc.bh, "get_write_access");
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 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
ext4_update_inline_data(handle_t * handle,struct inode * inode,unsigned int len)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 error = -ENOMEM;
344 goto out;
345 }
346
347 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
348 value, len);
349 if (error == -ENODATA)
350 goto out;
351
352 BUFFER_TRACE(is.iloc.bh, "get_write_access");
353 error = ext4_journal_get_write_access(handle, is.iloc.bh);
354 if (error)
355 goto out;
356
357 /* Update the xattr entry. */
358 i.value = value;
359 i.value_len = len;
360
361 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
362 if (error)
363 goto out;
364
365 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
366 (void *)ext4_raw_inode(&is.iloc));
367 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
368 le32_to_cpu(is.s.here->e_value_size);
369 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
370 get_bh(is.iloc.bh);
371 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
372
373 out:
374 kfree(value);
375 brelse(is.iloc.bh);
376 return error;
377 }
378
ext4_prepare_inline_data(handle_t * handle,struct inode * inode,unsigned int len)379 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
380 unsigned int len)
381 {
382 int ret, size, no_expand;
383 struct ext4_inode_info *ei = EXT4_I(inode);
384
385 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
386 return -ENOSPC;
387
388 size = ext4_get_max_inline_size(inode);
389 if (size < len)
390 return -ENOSPC;
391
392 ext4_write_lock_xattr(inode, &no_expand);
393
394 if (ei->i_inline_off)
395 ret = ext4_update_inline_data(handle, inode, len);
396 else
397 ret = ext4_create_inline_data(handle, inode, len);
398
399 ext4_write_unlock_xattr(inode, &no_expand);
400 return ret;
401 }
402
ext4_destroy_inline_data_nolock(handle_t * handle,struct inode * inode)403 static int ext4_destroy_inline_data_nolock(handle_t *handle,
404 struct inode *inode)
405 {
406 struct ext4_inode_info *ei = EXT4_I(inode);
407 struct ext4_xattr_ibody_find is = {
408 .s = { .not_found = 0, },
409 };
410 struct ext4_xattr_info i = {
411 .name_index = EXT4_XATTR_INDEX_SYSTEM,
412 .name = EXT4_XATTR_SYSTEM_DATA,
413 .value = NULL,
414 .value_len = 0,
415 };
416 int error;
417
418 if (!ei->i_inline_off)
419 return 0;
420
421 error = ext4_get_inode_loc(inode, &is.iloc);
422 if (error)
423 return error;
424
425 error = ext4_xattr_ibody_find(inode, &i, &is);
426 if (error)
427 goto out;
428
429 BUFFER_TRACE(is.iloc.bh, "get_write_access");
430 error = ext4_journal_get_write_access(handle, is.iloc.bh);
431 if (error)
432 goto out;
433
434 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
435 if (error)
436 goto out;
437
438 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
439 0, EXT4_MIN_INLINE_DATA_SIZE);
440 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
441
442 if (ext4_has_feature_extents(inode->i_sb)) {
443 if (S_ISDIR(inode->i_mode) ||
444 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
445 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
446 ext4_ext_tree_init(handle, inode);
447 }
448 }
449 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
450
451 get_bh(is.iloc.bh);
452 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
453
454 EXT4_I(inode)->i_inline_off = 0;
455 EXT4_I(inode)->i_inline_size = 0;
456 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
457 out:
458 brelse(is.iloc.bh);
459 if (error == -ENODATA)
460 error = 0;
461 return error;
462 }
463
ext4_read_inline_page(struct inode * inode,struct page * page)464 static int ext4_read_inline_page(struct inode *inode, struct page *page)
465 {
466 void *kaddr;
467 int ret = 0;
468 size_t len;
469 struct ext4_iloc iloc;
470
471 BUG_ON(!PageLocked(page));
472 BUG_ON(!ext4_has_inline_data(inode));
473 BUG_ON(page->index);
474
475 if (!EXT4_I(inode)->i_inline_off) {
476 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
477 inode->i_ino);
478 goto out;
479 }
480
481 ret = ext4_get_inode_loc(inode, &iloc);
482 if (ret)
483 goto out;
484
485 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
486 kaddr = kmap_atomic(page);
487 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
488 flush_dcache_page(page);
489 kunmap_atomic(kaddr);
490 zero_user_segment(page, len, PAGE_SIZE);
491 SetPageUptodate(page);
492 brelse(iloc.bh);
493
494 out:
495 return ret;
496 }
497
ext4_readpage_inline(struct inode * inode,struct page * page)498 int ext4_readpage_inline(struct inode *inode, struct page *page)
499 {
500 int ret = 0;
501
502 down_read(&EXT4_I(inode)->xattr_sem);
503 if (!ext4_has_inline_data(inode)) {
504 up_read(&EXT4_I(inode)->xattr_sem);
505 return -EAGAIN;
506 }
507
508 /*
509 * Current inline data can only exist in the 1st page,
510 * So for all the other pages, just set them uptodate.
511 */
512 if (!page->index)
513 ret = ext4_read_inline_page(inode, page);
514 else if (!PageUptodate(page)) {
515 zero_user_segment(page, 0, PAGE_SIZE);
516 SetPageUptodate(page);
517 }
518
519 up_read(&EXT4_I(inode)->xattr_sem);
520
521 unlock_page(page);
522 return ret >= 0 ? 0 : ret;
523 }
524
ext4_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags)525 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
526 struct inode *inode,
527 unsigned flags)
528 {
529 int ret, needed_blocks, no_expand;
530 handle_t *handle = NULL;
531 int retries = 0, sem_held = 0;
532 struct page *page = NULL;
533 unsigned from, to;
534 struct ext4_iloc iloc;
535
536 if (!ext4_has_inline_data(inode)) {
537 /*
538 * clear the flag so that no new write
539 * will trap here again.
540 */
541 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
542 return 0;
543 }
544
545 needed_blocks = ext4_writepage_trans_blocks(inode);
546
547 ret = ext4_get_inode_loc(inode, &iloc);
548 if (ret)
549 return ret;
550
551 retry:
552 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
553 if (IS_ERR(handle)) {
554 ret = PTR_ERR(handle);
555 handle = NULL;
556 goto out;
557 }
558
559 /* We cannot recurse into the filesystem as the transaction is already
560 * started */
561 flags |= AOP_FLAG_NOFS;
562
563 page = grab_cache_page_write_begin(mapping, 0, flags);
564 if (!page) {
565 ret = -ENOMEM;
566 goto out;
567 }
568
569 ext4_write_lock_xattr(inode, &no_expand);
570 sem_held = 1;
571 /* If some one has already done this for us, just exit. */
572 if (!ext4_has_inline_data(inode)) {
573 ret = 0;
574 goto out;
575 }
576
577 from = 0;
578 to = ext4_get_inline_size(inode);
579 if (!PageUptodate(page)) {
580 ret = ext4_read_inline_page(inode, page);
581 if (ret < 0)
582 goto out;
583 }
584
585 ret = ext4_destroy_inline_data_nolock(handle, inode);
586 if (ret)
587 goto out;
588
589 if (ext4_should_dioread_nolock(inode)) {
590 ret = __block_write_begin(page, from, to,
591 ext4_get_block_unwritten);
592 } else
593 ret = __block_write_begin(page, from, to, ext4_get_block);
594
595 if (!ret && ext4_should_journal_data(inode)) {
596 ret = ext4_walk_page_buffers(handle, page_buffers(page),
597 from, to, NULL,
598 do_journal_get_write_access);
599 }
600
601 if (ret) {
602 unlock_page(page);
603 put_page(page);
604 page = NULL;
605 ext4_orphan_add(handle, inode);
606 ext4_write_unlock_xattr(inode, &no_expand);
607 sem_held = 0;
608 ext4_journal_stop(handle);
609 handle = NULL;
610 ext4_truncate_failed_write(inode);
611 /*
612 * If truncate failed early the inode might
613 * still be on the orphan list; we need to
614 * make sure the inode is removed from the
615 * orphan list in that case.
616 */
617 if (inode->i_nlink)
618 ext4_orphan_del(NULL, inode);
619 }
620
621 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
622 goto retry;
623
624 if (page)
625 block_commit_write(page, from, to);
626 out:
627 if (page) {
628 unlock_page(page);
629 put_page(page);
630 }
631 if (sem_held)
632 ext4_write_unlock_xattr(inode, &no_expand);
633 if (handle)
634 ext4_journal_stop(handle);
635 brelse(iloc.bh);
636 return ret;
637 }
638
639 /*
640 * Try to write data in the inode.
641 * If the inode has inline data, check whether the new write can be
642 * in the inode also. If not, create the page the handle, move the data
643 * to the page make it update and let the later codes create extent for it.
644 */
ext4_try_to_write_inline_data(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,unsigned flags,struct page ** pagep)645 int ext4_try_to_write_inline_data(struct address_space *mapping,
646 struct inode *inode,
647 loff_t pos, unsigned len,
648 unsigned flags,
649 struct page **pagep)
650 {
651 int ret;
652 handle_t *handle;
653 struct page *page;
654 struct ext4_iloc iloc;
655
656 if (pos + len > ext4_get_max_inline_size(inode))
657 goto convert;
658
659 ret = ext4_get_inode_loc(inode, &iloc);
660 if (ret)
661 return ret;
662
663 /*
664 * The possible write could happen in the inode,
665 * so try to reserve the space in inode first.
666 */
667 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
668 if (IS_ERR(handle)) {
669 ret = PTR_ERR(handle);
670 handle = NULL;
671 goto out;
672 }
673
674 ret = ext4_prepare_inline_data(handle, inode, pos + len);
675 if (ret && ret != -ENOSPC)
676 goto out;
677
678 /* We don't have space in inline inode, so convert it to extent. */
679 if (ret == -ENOSPC) {
680 ext4_journal_stop(handle);
681 brelse(iloc.bh);
682 goto convert;
683 }
684
685 ret = ext4_journal_get_write_access(handle, iloc.bh);
686 if (ret)
687 goto out;
688
689 flags |= AOP_FLAG_NOFS;
690
691 page = grab_cache_page_write_begin(mapping, 0, flags);
692 if (!page) {
693 ret = -ENOMEM;
694 goto out;
695 }
696
697 *pagep = page;
698 down_read(&EXT4_I(inode)->xattr_sem);
699 if (!ext4_has_inline_data(inode)) {
700 ret = 0;
701 unlock_page(page);
702 put_page(page);
703 goto out_up_read;
704 }
705
706 if (!PageUptodate(page)) {
707 ret = ext4_read_inline_page(inode, page);
708 if (ret < 0) {
709 unlock_page(page);
710 put_page(page);
711 goto out_up_read;
712 }
713 }
714
715 ret = 1;
716 handle = NULL;
717 out_up_read:
718 up_read(&EXT4_I(inode)->xattr_sem);
719 out:
720 if (handle && (ret != 1))
721 ext4_journal_stop(handle);
722 brelse(iloc.bh);
723 return ret;
724 convert:
725 return ext4_convert_inline_data_to_extent(mapping,
726 inode, flags);
727 }
728
ext4_write_inline_data_end(struct inode * inode,loff_t pos,unsigned len,unsigned copied,struct page * page)729 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
730 unsigned copied, struct page *page)
731 {
732 handle_t *handle = ext4_journal_current_handle();
733 int no_expand;
734 void *kaddr;
735 struct ext4_iloc iloc;
736 int ret = 0, ret2;
737
738 if (unlikely(copied < len) && !PageUptodate(page))
739 copied = 0;
740
741 if (likely(copied)) {
742 ret = ext4_get_inode_loc(inode, &iloc);
743 if (ret) {
744 unlock_page(page);
745 put_page(page);
746 ext4_std_error(inode->i_sb, ret);
747 goto out;
748 }
749 ext4_write_lock_xattr(inode, &no_expand);
750 BUG_ON(!ext4_has_inline_data(inode));
751
752 /*
753 * ei->i_inline_off may have changed since
754 * ext4_write_begin() called
755 * ext4_try_to_write_inline_data()
756 */
757 (void) ext4_find_inline_data_nolock(inode);
758
759 kaddr = kmap_atomic(page);
760 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
761 kunmap_atomic(kaddr);
762 SetPageUptodate(page);
763 /* clear page dirty so that writepages wouldn't work for us. */
764 ClearPageDirty(page);
765
766 ext4_write_unlock_xattr(inode, &no_expand);
767 brelse(iloc.bh);
768
769 /*
770 * It's important to update i_size while still holding page
771 * lock: page writeout could otherwise come in and zero
772 * beyond i_size.
773 */
774 ext4_update_inode_size(inode, pos + copied);
775 }
776 unlock_page(page);
777 put_page(page);
778
779 /*
780 * Don't mark the inode dirty under page lock. First, it unnecessarily
781 * makes the holding time of page lock longer. Second, it forces lock
782 * ordering of page lock and transaction start for journaling
783 * filesystems.
784 */
785 if (likely(copied))
786 mark_inode_dirty(inode);
787 out:
788 /*
789 * If we didn't copy as much data as expected, we need to trim back
790 * size of xattr containing inline data.
791 */
792 if (pos + len > inode->i_size && ext4_can_truncate(inode))
793 ext4_orphan_add(handle, inode);
794
795 ret2 = ext4_journal_stop(handle);
796 if (!ret)
797 ret = ret2;
798 if (pos + len > inode->i_size) {
799 ext4_truncate_failed_write(inode);
800 /*
801 * If truncate failed early the inode might still be
802 * on the orphan list; we need to make sure the inode
803 * is removed from the orphan list in that case.
804 */
805 if (inode->i_nlink)
806 ext4_orphan_del(NULL, inode);
807 }
808 return ret ? ret : copied;
809 }
810
811 struct buffer_head *
ext4_journalled_write_inline_data(struct inode * inode,unsigned len,struct page * page)812 ext4_journalled_write_inline_data(struct inode *inode,
813 unsigned len,
814 struct page *page)
815 {
816 int ret, no_expand;
817 void *kaddr;
818 struct ext4_iloc iloc;
819
820 ret = ext4_get_inode_loc(inode, &iloc);
821 if (ret) {
822 ext4_std_error(inode->i_sb, ret);
823 return NULL;
824 }
825
826 ext4_write_lock_xattr(inode, &no_expand);
827 kaddr = kmap_atomic(page);
828 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
829 kunmap_atomic(kaddr);
830 ext4_write_unlock_xattr(inode, &no_expand);
831
832 return iloc.bh;
833 }
834
835 /*
836 * Try to make the page cache and handle ready for the inline data case.
837 * We can call this function in 2 cases:
838 * 1. The inode is created and the first write exceeds inline size. We can
839 * clear the inode state safely.
840 * 2. The inode has inline data, then we need to read the data, make it
841 * update and dirty so that ext4_da_writepages can handle it. We don't
842 * need to start the journal since the file's metatdata isn't changed now.
843 */
ext4_da_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags,void ** fsdata)844 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
845 struct inode *inode,
846 unsigned flags,
847 void **fsdata)
848 {
849 int ret = 0, inline_size;
850 struct page *page;
851
852 page = grab_cache_page_write_begin(mapping, 0, flags);
853 if (!page)
854 return -ENOMEM;
855
856 down_read(&EXT4_I(inode)->xattr_sem);
857 if (!ext4_has_inline_data(inode)) {
858 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
859 goto out;
860 }
861
862 inline_size = ext4_get_inline_size(inode);
863
864 if (!PageUptodate(page)) {
865 ret = ext4_read_inline_page(inode, page);
866 if (ret < 0)
867 goto out;
868 }
869
870 ret = __block_write_begin(page, 0, inline_size,
871 ext4_da_get_block_prep);
872 if (ret) {
873 up_read(&EXT4_I(inode)->xattr_sem);
874 unlock_page(page);
875 put_page(page);
876 ext4_truncate_failed_write(inode);
877 return ret;
878 }
879
880 SetPageDirty(page);
881 SetPageUptodate(page);
882 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
883 *fsdata = (void *)CONVERT_INLINE_DATA;
884
885 out:
886 up_read(&EXT4_I(inode)->xattr_sem);
887 if (page) {
888 unlock_page(page);
889 put_page(page);
890 }
891 return ret;
892 }
893
894 /*
895 * Prepare the write for the inline data.
896 * If the data can be written into the inode, we just read
897 * the page and make it uptodate, and start the journal.
898 * Otherwise read the page, makes it dirty so that it can be
899 * handle in writepages(the i_disksize update is left to the
900 * normal ext4_da_write_end).
901 */
ext4_da_write_inline_data_begin(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,unsigned flags,struct page ** pagep,void ** fsdata)902 int ext4_da_write_inline_data_begin(struct address_space *mapping,
903 struct inode *inode,
904 loff_t pos, unsigned len,
905 unsigned flags,
906 struct page **pagep,
907 void **fsdata)
908 {
909 int ret, inline_size;
910 handle_t *handle;
911 struct page *page;
912 struct ext4_iloc iloc;
913 int retries = 0;
914
915 ret = ext4_get_inode_loc(inode, &iloc);
916 if (ret)
917 return ret;
918
919 retry_journal:
920 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
921 if (IS_ERR(handle)) {
922 ret = PTR_ERR(handle);
923 goto out;
924 }
925
926 inline_size = ext4_get_max_inline_size(inode);
927
928 ret = -ENOSPC;
929 if (inline_size >= pos + len) {
930 ret = ext4_prepare_inline_data(handle, inode, pos + len);
931 if (ret && ret != -ENOSPC)
932 goto out_journal;
933 }
934
935 /*
936 * We cannot recurse into the filesystem as the transaction
937 * is already started.
938 */
939 flags |= AOP_FLAG_NOFS;
940
941 if (ret == -ENOSPC) {
942 ext4_journal_stop(handle);
943 ret = ext4_da_convert_inline_data_to_extent(mapping,
944 inode,
945 flags,
946 fsdata);
947 if (ret == -ENOSPC &&
948 ext4_should_retry_alloc(inode->i_sb, &retries))
949 goto retry_journal;
950 goto out;
951 }
952
953 page = grab_cache_page_write_begin(mapping, 0, flags);
954 if (!page) {
955 ret = -ENOMEM;
956 goto out_journal;
957 }
958
959 down_read(&EXT4_I(inode)->xattr_sem);
960 if (!ext4_has_inline_data(inode)) {
961 ret = 0;
962 goto out_release_page;
963 }
964
965 if (!PageUptodate(page)) {
966 ret = ext4_read_inline_page(inode, page);
967 if (ret < 0)
968 goto out_release_page;
969 }
970 ret = ext4_journal_get_write_access(handle, iloc.bh);
971 if (ret)
972 goto out_release_page;
973
974 up_read(&EXT4_I(inode)->xattr_sem);
975 *pagep = page;
976 brelse(iloc.bh);
977 return 1;
978 out_release_page:
979 up_read(&EXT4_I(inode)->xattr_sem);
980 unlock_page(page);
981 put_page(page);
982 out_journal:
983 ext4_journal_stop(handle);
984 out:
985 brelse(iloc.bh);
986 return ret;
987 }
988
989 #ifdef INLINE_DIR_DEBUG
ext4_show_inline_dir(struct inode * dir,struct buffer_head * bh,void * inline_start,int inline_size)990 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
991 void *inline_start, int inline_size)
992 {
993 int offset;
994 unsigned short de_len;
995 struct ext4_dir_entry_2 *de = inline_start;
996 void *dlimit = inline_start + inline_size;
997
998 trace_printk("inode %lu\n", dir->i_ino);
999 offset = 0;
1000 while ((void *)de < dlimit) {
1001 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1002 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1003 offset, de_len, de->name_len, de->name,
1004 de->name_len, le32_to_cpu(de->inode));
1005 if (ext4_check_dir_entry(dir, NULL, de, bh,
1006 inline_start, inline_size, offset))
1007 BUG();
1008
1009 offset += de_len;
1010 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1011 }
1012 }
1013 #else
1014 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1015 #endif
1016
1017 /*
1018 * Add a new entry into a inline dir.
1019 * It will return -ENOSPC if no space is available, and -EIO
1020 * and -EEXIST if directory entry already exists.
1021 */
ext4_add_dirent_to_inline(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode,struct ext4_iloc * iloc,void * inline_start,int inline_size)1022 static int ext4_add_dirent_to_inline(handle_t *handle,
1023 struct ext4_filename *fname,
1024 struct inode *dir,
1025 struct inode *inode,
1026 struct ext4_iloc *iloc,
1027 void *inline_start, int inline_size)
1028 {
1029 int err;
1030 struct ext4_dir_entry_2 *de;
1031
1032 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1033 inline_size, fname, &de);
1034 if (err)
1035 return err;
1036
1037 BUFFER_TRACE(iloc->bh, "get_write_access");
1038 err = ext4_journal_get_write_access(handle, iloc->bh);
1039 if (err)
1040 return err;
1041 ext4_insert_dentry(inode, de, inline_size, fname);
1042
1043 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1044
1045 /*
1046 * XXX shouldn't update any times until successful
1047 * completion of syscall, but too many callers depend
1048 * on this.
1049 *
1050 * XXX similarly, too many callers depend on
1051 * ext4_new_inode() setting the times, but error
1052 * recovery deletes the inode, so the worst that can
1053 * happen is that the times are slightly out of date
1054 * and/or different from the directory change time.
1055 */
1056 dir->i_mtime = dir->i_ctime = current_time(dir);
1057 ext4_update_dx_flag(dir);
1058 inode_inc_iversion(dir);
1059 return 1;
1060 }
1061
ext4_get_inline_xattr_pos(struct inode * inode,struct ext4_iloc * iloc)1062 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1063 struct ext4_iloc *iloc)
1064 {
1065 struct ext4_xattr_entry *entry;
1066 struct ext4_xattr_ibody_header *header;
1067
1068 BUG_ON(!EXT4_I(inode)->i_inline_off);
1069
1070 header = IHDR(inode, ext4_raw_inode(iloc));
1071 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1072 EXT4_I(inode)->i_inline_off);
1073
1074 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1075 }
1076
1077 /* Set the final de to cover the whole block. */
ext4_update_final_de(void * de_buf,int old_size,int new_size)1078 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1079 {
1080 struct ext4_dir_entry_2 *de, *prev_de;
1081 void *limit;
1082 int de_len;
1083
1084 de = (struct ext4_dir_entry_2 *)de_buf;
1085 if (old_size) {
1086 limit = de_buf + old_size;
1087 do {
1088 prev_de = de;
1089 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1090 de_buf += de_len;
1091 de = (struct ext4_dir_entry_2 *)de_buf;
1092 } while (de_buf < limit);
1093
1094 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1095 old_size, new_size);
1096 } else {
1097 /* this is just created, so create an empty entry. */
1098 de->inode = 0;
1099 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1100 }
1101 }
1102
ext4_update_inline_dir(handle_t * handle,struct inode * dir,struct ext4_iloc * iloc)1103 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1104 struct ext4_iloc *iloc)
1105 {
1106 int ret;
1107 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1108 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1109
1110 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1111 return -ENOSPC;
1112
1113 ret = ext4_update_inline_data(handle, dir,
1114 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1115 if (ret)
1116 return ret;
1117
1118 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1119 EXT4_I(dir)->i_inline_size -
1120 EXT4_MIN_INLINE_DATA_SIZE);
1121 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1122 return 0;
1123 }
1124
ext4_restore_inline_data(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc,void * buf,int inline_size)1125 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1126 struct ext4_iloc *iloc,
1127 void *buf, int inline_size)
1128 {
1129 ext4_create_inline_data(handle, inode, inline_size);
1130 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1131 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1132 }
1133
ext4_finish_convert_inline_dir(handle_t * handle,struct inode * inode,struct buffer_head * dir_block,void * buf,int inline_size)1134 static int ext4_finish_convert_inline_dir(handle_t *handle,
1135 struct inode *inode,
1136 struct buffer_head *dir_block,
1137 void *buf,
1138 int inline_size)
1139 {
1140 int err, csum_size = 0, header_size = 0;
1141 struct ext4_dir_entry_2 *de;
1142 void *target = dir_block->b_data;
1143
1144 /*
1145 * First create "." and ".." and then copy the dir information
1146 * back to the block.
1147 */
1148 de = (struct ext4_dir_entry_2 *)target;
1149 de = ext4_init_dot_dotdot(inode, de,
1150 inode->i_sb->s_blocksize, csum_size,
1151 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1152 header_size = (void *)de - target;
1153
1154 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1155 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1156
1157 if (ext4_has_metadata_csum(inode->i_sb))
1158 csum_size = sizeof(struct ext4_dir_entry_tail);
1159
1160 inode->i_size = inode->i_sb->s_blocksize;
1161 i_size_write(inode, inode->i_sb->s_blocksize);
1162 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1163 ext4_update_final_de(dir_block->b_data,
1164 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1165 inode->i_sb->s_blocksize - csum_size);
1166
1167 if (csum_size)
1168 ext4_initialize_dirent_tail(dir_block,
1169 inode->i_sb->s_blocksize);
1170 set_buffer_uptodate(dir_block);
1171 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1172 if (err)
1173 return err;
1174 set_buffer_verified(dir_block);
1175 return ext4_mark_inode_dirty(handle, inode);
1176 }
1177
ext4_convert_inline_data_nolock(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc)1178 static int ext4_convert_inline_data_nolock(handle_t *handle,
1179 struct inode *inode,
1180 struct ext4_iloc *iloc)
1181 {
1182 int error;
1183 void *buf = NULL;
1184 struct buffer_head *data_bh = NULL;
1185 struct ext4_map_blocks map;
1186 int inline_size;
1187
1188 inline_size = ext4_get_inline_size(inode);
1189 buf = kmalloc(inline_size, GFP_NOFS);
1190 if (!buf) {
1191 error = -ENOMEM;
1192 goto out;
1193 }
1194
1195 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1196 if (error < 0)
1197 goto out;
1198
1199 /*
1200 * Make sure the inline directory entries pass checks before we try to
1201 * convert them, so that we avoid touching stuff that needs fsck.
1202 */
1203 if (S_ISDIR(inode->i_mode)) {
1204 error = ext4_check_all_de(inode, iloc->bh,
1205 buf + EXT4_INLINE_DOTDOT_SIZE,
1206 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1207 if (error)
1208 goto out;
1209 }
1210
1211 error = ext4_destroy_inline_data_nolock(handle, inode);
1212 if (error)
1213 goto out;
1214
1215 map.m_lblk = 0;
1216 map.m_len = 1;
1217 map.m_flags = 0;
1218 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1219 if (error < 0)
1220 goto out_restore;
1221 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1222 error = -EIO;
1223 goto out_restore;
1224 }
1225
1226 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1227 if (!data_bh) {
1228 error = -ENOMEM;
1229 goto out_restore;
1230 }
1231
1232 lock_buffer(data_bh);
1233 error = ext4_journal_get_create_access(handle, data_bh);
1234 if (error) {
1235 unlock_buffer(data_bh);
1236 error = -EIO;
1237 goto out_restore;
1238 }
1239 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1240
1241 if (!S_ISDIR(inode->i_mode)) {
1242 memcpy(data_bh->b_data, buf, inline_size);
1243 set_buffer_uptodate(data_bh);
1244 error = ext4_handle_dirty_metadata(handle,
1245 inode, data_bh);
1246 } else {
1247 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1248 buf, inline_size);
1249 }
1250
1251 unlock_buffer(data_bh);
1252 out_restore:
1253 if (error)
1254 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1255
1256 out:
1257 brelse(data_bh);
1258 kfree(buf);
1259 return error;
1260 }
1261
1262 /*
1263 * Try to add the new entry to the inline data.
1264 * If succeeds, return 0. If not, extended the inline dir and copied data to
1265 * the new created block.
1266 */
ext4_try_add_inline_entry(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode)1267 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1268 struct inode *dir, struct inode *inode)
1269 {
1270 int ret, ret2, inline_size, no_expand;
1271 void *inline_start;
1272 struct ext4_iloc iloc;
1273
1274 ret = ext4_get_inode_loc(dir, &iloc);
1275 if (ret)
1276 return ret;
1277
1278 ext4_write_lock_xattr(dir, &no_expand);
1279 if (!ext4_has_inline_data(dir))
1280 goto out;
1281
1282 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1283 EXT4_INLINE_DOTDOT_SIZE;
1284 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1285
1286 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1287 inline_start, inline_size);
1288 if (ret != -ENOSPC)
1289 goto out;
1290
1291 /* check whether it can be inserted to inline xattr space. */
1292 inline_size = EXT4_I(dir)->i_inline_size -
1293 EXT4_MIN_INLINE_DATA_SIZE;
1294 if (!inline_size) {
1295 /* Try to use the xattr space.*/
1296 ret = ext4_update_inline_dir(handle, dir, &iloc);
1297 if (ret && ret != -ENOSPC)
1298 goto out;
1299
1300 inline_size = EXT4_I(dir)->i_inline_size -
1301 EXT4_MIN_INLINE_DATA_SIZE;
1302 }
1303
1304 if (inline_size) {
1305 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1306
1307 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1308 inode, &iloc, inline_start,
1309 inline_size);
1310
1311 if (ret != -ENOSPC)
1312 goto out;
1313 }
1314
1315 /*
1316 * The inline space is filled up, so create a new block for it.
1317 * As the extent tree will be created, we have to save the inline
1318 * dir first.
1319 */
1320 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1321
1322 out:
1323 ext4_write_unlock_xattr(dir, &no_expand);
1324 ret2 = ext4_mark_inode_dirty(handle, dir);
1325 if (unlikely(ret2 && !ret))
1326 ret = ret2;
1327 brelse(iloc.bh);
1328 return ret;
1329 }
1330
1331 /*
1332 * This function fills a red-black tree with information from an
1333 * inlined dir. It returns the number directory entries loaded
1334 * into the tree. If there is an error it is returned in err.
1335 */
ext4_inlinedir_to_tree(struct file * dir_file,struct inode * dir,ext4_lblk_t block,struct dx_hash_info * hinfo,__u32 start_hash,__u32 start_minor_hash,int * has_inline_data)1336 int ext4_inlinedir_to_tree(struct file *dir_file,
1337 struct inode *dir, ext4_lblk_t block,
1338 struct dx_hash_info *hinfo,
1339 __u32 start_hash, __u32 start_minor_hash,
1340 int *has_inline_data)
1341 {
1342 int err = 0, count = 0;
1343 unsigned int parent_ino;
1344 int pos;
1345 struct ext4_dir_entry_2 *de;
1346 struct inode *inode = file_inode(dir_file);
1347 int ret, inline_size = 0;
1348 struct ext4_iloc iloc;
1349 void *dir_buf = NULL;
1350 struct ext4_dir_entry_2 fake;
1351 struct fscrypt_str tmp_str;
1352
1353 ret = ext4_get_inode_loc(inode, &iloc);
1354 if (ret)
1355 return ret;
1356
1357 down_read(&EXT4_I(inode)->xattr_sem);
1358 if (!ext4_has_inline_data(inode)) {
1359 up_read(&EXT4_I(inode)->xattr_sem);
1360 *has_inline_data = 0;
1361 goto out;
1362 }
1363
1364 inline_size = ext4_get_inline_size(inode);
1365 dir_buf = kmalloc(inline_size, GFP_NOFS);
1366 if (!dir_buf) {
1367 ret = -ENOMEM;
1368 up_read(&EXT4_I(inode)->xattr_sem);
1369 goto out;
1370 }
1371
1372 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1373 up_read(&EXT4_I(inode)->xattr_sem);
1374 if (ret < 0)
1375 goto out;
1376
1377 pos = 0;
1378 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1379 while (pos < inline_size) {
1380 /*
1381 * As inlined dir doesn't store any information about '.' and
1382 * only the inode number of '..' is stored, we have to handle
1383 * them differently.
1384 */
1385 if (pos == 0) {
1386 fake.inode = cpu_to_le32(inode->i_ino);
1387 fake.name_len = 1;
1388 strcpy(fake.name, ".");
1389 fake.rec_len = ext4_rec_len_to_disk(
1390 EXT4_DIR_REC_LEN(fake.name_len),
1391 inline_size);
1392 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1393 de = &fake;
1394 pos = EXT4_INLINE_DOTDOT_OFFSET;
1395 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1396 fake.inode = cpu_to_le32(parent_ino);
1397 fake.name_len = 2;
1398 strcpy(fake.name, "..");
1399 fake.rec_len = ext4_rec_len_to_disk(
1400 EXT4_DIR_REC_LEN(fake.name_len),
1401 inline_size);
1402 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1403 de = &fake;
1404 pos = EXT4_INLINE_DOTDOT_SIZE;
1405 } else {
1406 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1407 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1408 if (ext4_check_dir_entry(inode, dir_file, de,
1409 iloc.bh, dir_buf,
1410 inline_size, pos)) {
1411 ret = count;
1412 goto out;
1413 }
1414 }
1415
1416 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1417 if ((hinfo->hash < start_hash) ||
1418 ((hinfo->hash == start_hash) &&
1419 (hinfo->minor_hash < start_minor_hash)))
1420 continue;
1421 if (de->inode == 0)
1422 continue;
1423 tmp_str.name = de->name;
1424 tmp_str.len = de->name_len;
1425 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1426 hinfo->minor_hash, de, &tmp_str);
1427 if (err) {
1428 ret = err;
1429 goto out;
1430 }
1431 count++;
1432 }
1433 ret = count;
1434 out:
1435 kfree(dir_buf);
1436 brelse(iloc.bh);
1437 return ret;
1438 }
1439
1440 /*
1441 * So this function is called when the volume is mkfsed with
1442 * dir_index disabled. In order to keep f_pos persistent
1443 * after we convert from an inlined dir to a blocked based,
1444 * we just pretend that we are a normal dir and return the
1445 * offset as if '.' and '..' really take place.
1446 *
1447 */
ext4_read_inline_dir(struct file * file,struct dir_context * ctx,int * has_inline_data)1448 int ext4_read_inline_dir(struct file *file,
1449 struct dir_context *ctx,
1450 int *has_inline_data)
1451 {
1452 unsigned int offset, parent_ino;
1453 int i;
1454 struct ext4_dir_entry_2 *de;
1455 struct super_block *sb;
1456 struct inode *inode = file_inode(file);
1457 int ret, inline_size = 0;
1458 struct ext4_iloc iloc;
1459 void *dir_buf = NULL;
1460 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1461
1462 ret = ext4_get_inode_loc(inode, &iloc);
1463 if (ret)
1464 return ret;
1465
1466 down_read(&EXT4_I(inode)->xattr_sem);
1467 if (!ext4_has_inline_data(inode)) {
1468 up_read(&EXT4_I(inode)->xattr_sem);
1469 *has_inline_data = 0;
1470 goto out;
1471 }
1472
1473 inline_size = ext4_get_inline_size(inode);
1474 dir_buf = kmalloc(inline_size, GFP_NOFS);
1475 if (!dir_buf) {
1476 ret = -ENOMEM;
1477 up_read(&EXT4_I(inode)->xattr_sem);
1478 goto out;
1479 }
1480
1481 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1482 up_read(&EXT4_I(inode)->xattr_sem);
1483 if (ret < 0)
1484 goto out;
1485
1486 ret = 0;
1487 sb = inode->i_sb;
1488 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1489 offset = ctx->pos;
1490
1491 /*
1492 * dotdot_offset and dotdot_size is the real offset and
1493 * size for ".." and "." if the dir is block based while
1494 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1495 * So we will use extra_offset and extra_size to indicate them
1496 * during the inline dir iteration.
1497 */
1498 dotdot_offset = EXT4_DIR_REC_LEN(1);
1499 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1500 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1501 extra_size = extra_offset + inline_size;
1502
1503 /*
1504 * If the version has changed since the last call to
1505 * readdir(2), then we might be pointing to an invalid
1506 * dirent right now. Scan from the start of the inline
1507 * dir to make sure.
1508 */
1509 if (!inode_eq_iversion(inode, file->f_version)) {
1510 for (i = 0; i < extra_size && i < offset;) {
1511 /*
1512 * "." is with offset 0 and
1513 * ".." is dotdot_offset.
1514 */
1515 if (!i) {
1516 i = dotdot_offset;
1517 continue;
1518 } else if (i == dotdot_offset) {
1519 i = dotdot_size;
1520 continue;
1521 }
1522 /* for other entry, the real offset in
1523 * the buf has to be tuned accordingly.
1524 */
1525 de = (struct ext4_dir_entry_2 *)
1526 (dir_buf + i - extra_offset);
1527 /* It's too expensive to do a full
1528 * dirent test each time round this
1529 * loop, but we do have to test at
1530 * least that it is non-zero. A
1531 * failure will be detected in the
1532 * dirent test below. */
1533 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1534 < EXT4_DIR_REC_LEN(1))
1535 break;
1536 i += ext4_rec_len_from_disk(de->rec_len,
1537 extra_size);
1538 }
1539 offset = i;
1540 ctx->pos = offset;
1541 file->f_version = inode_query_iversion(inode);
1542 }
1543
1544 while (ctx->pos < extra_size) {
1545 if (ctx->pos == 0) {
1546 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1547 goto out;
1548 ctx->pos = dotdot_offset;
1549 continue;
1550 }
1551
1552 if (ctx->pos == dotdot_offset) {
1553 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1554 goto out;
1555 ctx->pos = dotdot_size;
1556 continue;
1557 }
1558
1559 de = (struct ext4_dir_entry_2 *)
1560 (dir_buf + ctx->pos - extra_offset);
1561 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1562 extra_size, ctx->pos))
1563 goto out;
1564 if (le32_to_cpu(de->inode)) {
1565 if (!dir_emit(ctx, de->name, de->name_len,
1566 le32_to_cpu(de->inode),
1567 get_dtype(sb, de->file_type)))
1568 goto out;
1569 }
1570 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1571 }
1572 out:
1573 kfree(dir_buf);
1574 brelse(iloc.bh);
1575 return ret;
1576 }
1577
ext4_get_first_inline_block(struct inode * inode,struct ext4_dir_entry_2 ** parent_de,int * retval)1578 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1579 struct ext4_dir_entry_2 **parent_de,
1580 int *retval)
1581 {
1582 struct ext4_iloc iloc;
1583
1584 *retval = ext4_get_inode_loc(inode, &iloc);
1585 if (*retval)
1586 return NULL;
1587
1588 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1589
1590 return iloc.bh;
1591 }
1592
1593 /*
1594 * Try to create the inline data for the new dir.
1595 * If it succeeds, return 0, otherwise return the error.
1596 * In case of ENOSPC, the caller should create the normal disk layout dir.
1597 */
ext4_try_create_inline_dir(handle_t * handle,struct inode * parent,struct inode * inode)1598 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1599 struct inode *inode)
1600 {
1601 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1602 struct ext4_iloc iloc;
1603 struct ext4_dir_entry_2 *de;
1604
1605 ret = ext4_get_inode_loc(inode, &iloc);
1606 if (ret)
1607 return ret;
1608
1609 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1610 if (ret)
1611 goto out;
1612
1613 /*
1614 * For inline dir, we only save the inode information for the ".."
1615 * and create a fake dentry to cover the left space.
1616 */
1617 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1618 de->inode = cpu_to_le32(parent->i_ino);
1619 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1620 de->inode = 0;
1621 de->rec_len = ext4_rec_len_to_disk(
1622 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1623 inline_size);
1624 set_nlink(inode, 2);
1625 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1626 out:
1627 brelse(iloc.bh);
1628 return ret;
1629 }
1630
ext4_find_inline_entry(struct inode * dir,struct ext4_filename * fname,struct ext4_dir_entry_2 ** res_dir,int * has_inline_data)1631 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1632 struct ext4_filename *fname,
1633 struct ext4_dir_entry_2 **res_dir,
1634 int *has_inline_data)
1635 {
1636 int ret;
1637 struct ext4_iloc iloc;
1638 void *inline_start;
1639 int inline_size;
1640
1641 if (ext4_get_inode_loc(dir, &iloc))
1642 return NULL;
1643
1644 down_read(&EXT4_I(dir)->xattr_sem);
1645 if (!ext4_has_inline_data(dir)) {
1646 *has_inline_data = 0;
1647 goto out;
1648 }
1649
1650 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1651 EXT4_INLINE_DOTDOT_SIZE;
1652 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1653 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1654 dir, fname, 0, res_dir);
1655 if (ret == 1)
1656 goto out_find;
1657 if (ret < 0)
1658 goto out;
1659
1660 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1661 goto out;
1662
1663 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1664 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1665
1666 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1667 dir, fname, 0, res_dir);
1668 if (ret == 1)
1669 goto out_find;
1670
1671 out:
1672 brelse(iloc.bh);
1673 iloc.bh = NULL;
1674 out_find:
1675 up_read(&EXT4_I(dir)->xattr_sem);
1676 return iloc.bh;
1677 }
1678
ext4_delete_inline_entry(handle_t * handle,struct inode * dir,struct ext4_dir_entry_2 * de_del,struct buffer_head * bh,int * has_inline_data)1679 int ext4_delete_inline_entry(handle_t *handle,
1680 struct inode *dir,
1681 struct ext4_dir_entry_2 *de_del,
1682 struct buffer_head *bh,
1683 int *has_inline_data)
1684 {
1685 int err, inline_size, no_expand;
1686 struct ext4_iloc iloc;
1687 void *inline_start;
1688
1689 err = ext4_get_inode_loc(dir, &iloc);
1690 if (err)
1691 return err;
1692
1693 ext4_write_lock_xattr(dir, &no_expand);
1694 if (!ext4_has_inline_data(dir)) {
1695 *has_inline_data = 0;
1696 goto out;
1697 }
1698
1699 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1700 EXT4_MIN_INLINE_DATA_SIZE) {
1701 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1702 EXT4_INLINE_DOTDOT_SIZE;
1703 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1704 EXT4_INLINE_DOTDOT_SIZE;
1705 } else {
1706 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1707 inline_size = ext4_get_inline_size(dir) -
1708 EXT4_MIN_INLINE_DATA_SIZE;
1709 }
1710
1711 BUFFER_TRACE(bh, "get_write_access");
1712 err = ext4_journal_get_write_access(handle, bh);
1713 if (err)
1714 goto out;
1715
1716 err = ext4_generic_delete_entry(dir, de_del, bh,
1717 inline_start, inline_size, 0);
1718 if (err)
1719 goto out;
1720
1721 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1722 out:
1723 ext4_write_unlock_xattr(dir, &no_expand);
1724 if (likely(err == 0))
1725 err = ext4_mark_inode_dirty(handle, dir);
1726 brelse(iloc.bh);
1727 if (err != -ENOENT)
1728 ext4_std_error(dir->i_sb, err);
1729 return err;
1730 }
1731
1732 /*
1733 * Get the inline dentry at offset.
1734 */
1735 static inline struct ext4_dir_entry_2 *
ext4_get_inline_entry(struct inode * inode,struct ext4_iloc * iloc,unsigned int offset,void ** inline_start,int * inline_size)1736 ext4_get_inline_entry(struct inode *inode,
1737 struct ext4_iloc *iloc,
1738 unsigned int offset,
1739 void **inline_start,
1740 int *inline_size)
1741 {
1742 void *inline_pos;
1743
1744 BUG_ON(offset > ext4_get_inline_size(inode));
1745
1746 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1747 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1748 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1749 } else {
1750 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1751 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1752 *inline_size = ext4_get_inline_size(inode) -
1753 EXT4_MIN_INLINE_DATA_SIZE;
1754 }
1755
1756 if (inline_start)
1757 *inline_start = inline_pos;
1758 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1759 }
1760
empty_inline_dir(struct inode * dir,int * has_inline_data)1761 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1762 {
1763 int err, inline_size;
1764 struct ext4_iloc iloc;
1765 size_t inline_len;
1766 void *inline_pos;
1767 unsigned int offset;
1768 struct ext4_dir_entry_2 *de;
1769 bool ret = true;
1770
1771 err = ext4_get_inode_loc(dir, &iloc);
1772 if (err) {
1773 EXT4_ERROR_INODE_ERR(dir, -err,
1774 "error %d getting inode %lu block",
1775 err, dir->i_ino);
1776 return true;
1777 }
1778
1779 down_read(&EXT4_I(dir)->xattr_sem);
1780 if (!ext4_has_inline_data(dir)) {
1781 *has_inline_data = 0;
1782 goto out;
1783 }
1784
1785 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1786 if (!le32_to_cpu(de->inode)) {
1787 ext4_warning(dir->i_sb,
1788 "bad inline directory (dir #%lu) - no `..'",
1789 dir->i_ino);
1790 ret = true;
1791 goto out;
1792 }
1793
1794 inline_len = ext4_get_inline_size(dir);
1795 offset = EXT4_INLINE_DOTDOT_SIZE;
1796 while (offset < inline_len) {
1797 de = ext4_get_inline_entry(dir, &iloc, offset,
1798 &inline_pos, &inline_size);
1799 if (ext4_check_dir_entry(dir, NULL, de,
1800 iloc.bh, inline_pos,
1801 inline_size, offset)) {
1802 ext4_warning(dir->i_sb,
1803 "bad inline directory (dir #%lu) - "
1804 "inode %u, rec_len %u, name_len %d"
1805 "inline size %d",
1806 dir->i_ino, le32_to_cpu(de->inode),
1807 le16_to_cpu(de->rec_len), de->name_len,
1808 inline_size);
1809 ret = true;
1810 goto out;
1811 }
1812 if (le32_to_cpu(de->inode)) {
1813 ret = false;
1814 goto out;
1815 }
1816 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1817 }
1818
1819 out:
1820 up_read(&EXT4_I(dir)->xattr_sem);
1821 brelse(iloc.bh);
1822 return ret;
1823 }
1824
ext4_destroy_inline_data(handle_t * handle,struct inode * inode)1825 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1826 {
1827 int ret, no_expand;
1828
1829 ext4_write_lock_xattr(inode, &no_expand);
1830 ret = ext4_destroy_inline_data_nolock(handle, inode);
1831 ext4_write_unlock_xattr(inode, &no_expand);
1832
1833 return ret;
1834 }
1835
ext4_inline_data_iomap(struct inode * inode,struct iomap * iomap)1836 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1837 {
1838 __u64 addr;
1839 int error = -EAGAIN;
1840 struct ext4_iloc iloc;
1841
1842 down_read(&EXT4_I(inode)->xattr_sem);
1843 if (!ext4_has_inline_data(inode))
1844 goto out;
1845
1846 error = ext4_get_inode_loc(inode, &iloc);
1847 if (error)
1848 goto out;
1849
1850 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1851 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1852 addr += offsetof(struct ext4_inode, i_block);
1853
1854 brelse(iloc.bh);
1855
1856 iomap->addr = addr;
1857 iomap->offset = 0;
1858 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1859 i_size_read(inode));
1860 iomap->type = IOMAP_INLINE;
1861 iomap->flags = 0;
1862
1863 out:
1864 up_read(&EXT4_I(inode)->xattr_sem);
1865 return error;
1866 }
1867
ext4_inline_data_truncate(struct inode * inode,int * has_inline)1868 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1869 {
1870 handle_t *handle;
1871 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1872 size_t i_size;
1873 void *value = NULL;
1874 struct ext4_xattr_ibody_find is = {
1875 .s = { .not_found = -ENODATA, },
1876 };
1877 struct ext4_xattr_info i = {
1878 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1879 .name = EXT4_XATTR_SYSTEM_DATA,
1880 };
1881
1882
1883 needed_blocks = ext4_writepage_trans_blocks(inode);
1884 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1885 if (IS_ERR(handle))
1886 return PTR_ERR(handle);
1887
1888 ext4_write_lock_xattr(inode, &no_expand);
1889 if (!ext4_has_inline_data(inode)) {
1890 ext4_write_unlock_xattr(inode, &no_expand);
1891 *has_inline = 0;
1892 ext4_journal_stop(handle);
1893 return 0;
1894 }
1895
1896 if ((err = ext4_orphan_add(handle, inode)) != 0)
1897 goto out;
1898
1899 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1900 goto out;
1901
1902 down_write(&EXT4_I(inode)->i_data_sem);
1903 i_size = inode->i_size;
1904 inline_size = ext4_get_inline_size(inode);
1905 EXT4_I(inode)->i_disksize = i_size;
1906
1907 if (i_size < inline_size) {
1908 /* Clear the content in the xattr space. */
1909 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1910 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1911 goto out_error;
1912
1913 BUG_ON(is.s.not_found);
1914
1915 value_len = le32_to_cpu(is.s.here->e_value_size);
1916 value = kmalloc(value_len, GFP_NOFS);
1917 if (!value) {
1918 err = -ENOMEM;
1919 goto out_error;
1920 }
1921
1922 err = ext4_xattr_ibody_get(inode, i.name_index,
1923 i.name, value, value_len);
1924 if (err <= 0)
1925 goto out_error;
1926
1927 i.value = value;
1928 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1929 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1930 err = ext4_xattr_ibody_inline_set(handle, inode,
1931 &i, &is);
1932 if (err)
1933 goto out_error;
1934 }
1935
1936 /* Clear the content within i_blocks. */
1937 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1938 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1939 memset(p + i_size, 0,
1940 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1941 }
1942
1943 EXT4_I(inode)->i_inline_size = i_size <
1944 EXT4_MIN_INLINE_DATA_SIZE ?
1945 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1946 }
1947
1948 out_error:
1949 up_write(&EXT4_I(inode)->i_data_sem);
1950 out:
1951 brelse(is.iloc.bh);
1952 ext4_write_unlock_xattr(inode, &no_expand);
1953 kfree(value);
1954 if (inode->i_nlink)
1955 ext4_orphan_del(handle, inode);
1956
1957 if (err == 0) {
1958 inode->i_mtime = inode->i_ctime = current_time(inode);
1959 err = ext4_mark_inode_dirty(handle, inode);
1960 if (IS_SYNC(inode))
1961 ext4_handle_sync(handle);
1962 }
1963 ext4_journal_stop(handle);
1964 return err;
1965 }
1966
ext4_convert_inline_data(struct inode * inode)1967 int ext4_convert_inline_data(struct inode *inode)
1968 {
1969 int error, needed_blocks, no_expand;
1970 handle_t *handle;
1971 struct ext4_iloc iloc;
1972
1973 if (!ext4_has_inline_data(inode)) {
1974 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1975 return 0;
1976 }
1977
1978 needed_blocks = ext4_writepage_trans_blocks(inode);
1979
1980 iloc.bh = NULL;
1981 error = ext4_get_inode_loc(inode, &iloc);
1982 if (error)
1983 return error;
1984
1985 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1986 if (IS_ERR(handle)) {
1987 error = PTR_ERR(handle);
1988 goto out_free;
1989 }
1990
1991 ext4_write_lock_xattr(inode, &no_expand);
1992 if (ext4_has_inline_data(inode))
1993 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1994 ext4_write_unlock_xattr(inode, &no_expand);
1995 ext4_journal_stop(handle);
1996 out_free:
1997 brelse(iloc.bh);
1998 return error;
1999 }
2000