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 #include <linux/backing-dev.h>
11
12 #include "ext4_jbd2.h"
13 #include "ext4.h"
14 #include "xattr.h"
15 #include "truncate.h"
16
17 #define EXT4_XATTR_SYSTEM_DATA "data"
18 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
19 #define EXT4_INLINE_DOTDOT_OFFSET 2
20 #define EXT4_INLINE_DOTDOT_SIZE 4
21
ext4_get_inline_size(struct inode * inode)22 static int ext4_get_inline_size(struct inode *inode)
23 {
24 if (EXT4_I(inode)->i_inline_off)
25 return EXT4_I(inode)->i_inline_size;
26
27 return 0;
28 }
29
get_max_inline_xattr_value_size(struct inode * inode,struct ext4_iloc * iloc)30 static int get_max_inline_xattr_value_size(struct inode *inode,
31 struct ext4_iloc *iloc)
32 {
33 struct ext4_xattr_ibody_header *header;
34 struct ext4_xattr_entry *entry;
35 struct ext4_inode *raw_inode;
36 int free, min_offs;
37
38 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
39 EXT4_GOOD_OLD_INODE_SIZE -
40 EXT4_I(inode)->i_extra_isize -
41 sizeof(struct ext4_xattr_ibody_header);
42
43 /*
44 * We need to subtract another sizeof(__u32) since an in-inode xattr
45 * needs an empty 4 bytes to indicate the gap between the xattr entry
46 * and the name/value pair.
47 */
48 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
49 return EXT4_XATTR_SIZE(min_offs -
50 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
51 EXT4_XATTR_ROUND - sizeof(__u32));
52
53 raw_inode = ext4_raw_inode(iloc);
54 header = IHDR(inode, raw_inode);
55 entry = IFIRST(header);
56
57 /* Compute min_offs. */
58 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
59 if (!entry->e_value_inum && entry->e_value_size) {
60 size_t offs = le16_to_cpu(entry->e_value_offs);
61 if (offs < min_offs)
62 min_offs = offs;
63 }
64 }
65 free = min_offs -
66 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
67
68 if (EXT4_I(inode)->i_inline_off) {
69 entry = (struct ext4_xattr_entry *)
70 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
71
72 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
73 goto out;
74 }
75
76 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
77
78 if (free > EXT4_XATTR_ROUND)
79 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
80 else
81 free = 0;
82
83 out:
84 return free;
85 }
86
87 /*
88 * Get the maximum size we now can store in an inode.
89 * If we can't find the space for a xattr entry, don't use the space
90 * of the extents since we have no space to indicate the inline data.
91 */
ext4_get_max_inline_size(struct inode * inode)92 int ext4_get_max_inline_size(struct inode *inode)
93 {
94 int error, max_inline_size;
95 struct ext4_iloc iloc;
96
97 if (EXT4_I(inode)->i_extra_isize == 0)
98 return 0;
99
100 error = ext4_get_inode_loc(inode, &iloc);
101 if (error) {
102 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
103 "can't get inode location %lu",
104 inode->i_ino);
105 return 0;
106 }
107
108 down_read(&EXT4_I(inode)->xattr_sem);
109 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
110 up_read(&EXT4_I(inode)->xattr_sem);
111
112 brelse(iloc.bh);
113
114 if (!max_inline_size)
115 return 0;
116
117 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
118 }
119
120 /*
121 * this function does not take xattr_sem, which is OK because it is
122 * currently only used in a code path coming form ext4_iget, before
123 * the new inode has been unlocked
124 */
ext4_find_inline_data_nolock(struct inode * inode)125 int ext4_find_inline_data_nolock(struct inode *inode)
126 {
127 struct ext4_xattr_ibody_find is = {
128 .s = { .not_found = -ENODATA, },
129 };
130 struct ext4_xattr_info i = {
131 .name_index = EXT4_XATTR_INDEX_SYSTEM,
132 .name = EXT4_XATTR_SYSTEM_DATA,
133 };
134 int error;
135
136 if (EXT4_I(inode)->i_extra_isize == 0)
137 return 0;
138
139 error = ext4_get_inode_loc(inode, &is.iloc);
140 if (error)
141 return error;
142
143 error = ext4_xattr_ibody_find(inode, &i, &is);
144 if (error)
145 goto out;
146
147 if (!is.s.not_found) {
148 if (is.s.here->e_value_inum) {
149 EXT4_ERROR_INODE(inode, "inline data xattr refers "
150 "to an external xattr inode");
151 error = -EFSCORRUPTED;
152 goto out;
153 }
154 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
155 (void *)ext4_raw_inode(&is.iloc));
156 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
157 le32_to_cpu(is.s.here->e_value_size);
158 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
159 }
160 out:
161 brelse(is.iloc.bh);
162 return error;
163 }
164
ext4_read_inline_data(struct inode * inode,void * buffer,unsigned int len,struct ext4_iloc * iloc)165 static int ext4_read_inline_data(struct inode *inode, void *buffer,
166 unsigned int len,
167 struct ext4_iloc *iloc)
168 {
169 struct ext4_xattr_entry *entry;
170 struct ext4_xattr_ibody_header *header;
171 int cp_len = 0;
172 struct ext4_inode *raw_inode;
173
174 if (!len)
175 return 0;
176
177 BUG_ON(len > EXT4_I(inode)->i_inline_size);
178
179 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
180 len : EXT4_MIN_INLINE_DATA_SIZE;
181
182 raw_inode = ext4_raw_inode(iloc);
183 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
184
185 len -= cp_len;
186 buffer += cp_len;
187
188 if (!len)
189 goto out;
190
191 header = IHDR(inode, raw_inode);
192 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
193 EXT4_I(inode)->i_inline_off);
194 len = min_t(unsigned int, len,
195 (unsigned int)le32_to_cpu(entry->e_value_size));
196
197 memcpy(buffer,
198 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
199 cp_len += len;
200
201 out:
202 return cp_len;
203 }
204
205 /*
206 * write the buffer to the inline inode.
207 * If 'create' is set, we don't need to do the extra copy in the xattr
208 * value since it is already handled by ext4_xattr_ibody_set.
209 * That saves us one memcpy.
210 */
ext4_write_inline_data(struct inode * inode,struct ext4_iloc * iloc,void * buffer,loff_t pos,unsigned int len)211 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
212 void *buffer, loff_t pos, unsigned int len)
213 {
214 struct ext4_xattr_entry *entry;
215 struct ext4_xattr_ibody_header *header;
216 struct ext4_inode *raw_inode;
217 int cp_len = 0;
218
219 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
220 return;
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
ext4_create_inline_data(handle_t * handle,struct inode * inode,unsigned len)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 BUFFER_TRACE(is.iloc.bh, "get_write_access");
268 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
269 EXT4_JTR_NONE);
270 if (error)
271 goto out;
272
273 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
274 value = EXT4_ZERO_XATTR_VALUE;
275 len -= EXT4_MIN_INLINE_DATA_SIZE;
276 } else {
277 value = "";
278 len = 0;
279 }
280
281 /* Insert the xttr entry. */
282 i.value = value;
283 i.value_len = len;
284
285 error = ext4_xattr_ibody_find(inode, &i, &is);
286 if (error)
287 goto out;
288
289 BUG_ON(!is.s.not_found);
290
291 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
292 if (error) {
293 if (error == -ENOSPC)
294 ext4_clear_inode_state(inode,
295 EXT4_STATE_MAY_INLINE_DATA);
296 goto out;
297 }
298
299 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
300 0, EXT4_MIN_INLINE_DATA_SIZE);
301
302 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
303 (void *)ext4_raw_inode(&is.iloc));
304 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
305 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
306 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
307 get_bh(is.iloc.bh);
308 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
309
310 out:
311 brelse(is.iloc.bh);
312 return error;
313 }
314
ext4_update_inline_data(handle_t * handle,struct inode * inode,unsigned int len)315 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
316 unsigned int len)
317 {
318 int error;
319 void *value = NULL;
320 struct ext4_xattr_ibody_find is = {
321 .s = { .not_found = -ENODATA, },
322 };
323 struct ext4_xattr_info i = {
324 .name_index = EXT4_XATTR_INDEX_SYSTEM,
325 .name = EXT4_XATTR_SYSTEM_DATA,
326 };
327
328 /* If the old space is ok, write the data directly. */
329 if (len <= EXT4_I(inode)->i_inline_size)
330 return 0;
331
332 error = ext4_get_inode_loc(inode, &is.iloc);
333 if (error)
334 return error;
335
336 error = ext4_xattr_ibody_find(inode, &i, &is);
337 if (error)
338 goto out;
339
340 BUG_ON(is.s.not_found);
341
342 len -= EXT4_MIN_INLINE_DATA_SIZE;
343 value = kzalloc(len, GFP_NOFS);
344 if (!value) {
345 error = -ENOMEM;
346 goto out;
347 }
348
349 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
350 value, len);
351 if (error == -ENODATA)
352 goto out;
353
354 BUFFER_TRACE(is.iloc.bh, "get_write_access");
355 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
356 EXT4_JTR_NONE);
357 if (error)
358 goto out;
359
360 /* Update the xattr entry. */
361 i.value = value;
362 i.value_len = len;
363
364 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
365 if (error)
366 goto out;
367
368 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
369 (void *)ext4_raw_inode(&is.iloc));
370 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
371 le32_to_cpu(is.s.here->e_value_size);
372 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
373 get_bh(is.iloc.bh);
374 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
375
376 out:
377 kfree(value);
378 brelse(is.iloc.bh);
379 return error;
380 }
381
ext4_prepare_inline_data(handle_t * handle,struct inode * inode,unsigned int len)382 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
383 unsigned int len)
384 {
385 int ret, size, no_expand;
386 struct ext4_inode_info *ei = EXT4_I(inode);
387
388 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
389 return -ENOSPC;
390
391 size = ext4_get_max_inline_size(inode);
392 if (size < len)
393 return -ENOSPC;
394
395 ext4_write_lock_xattr(inode, &no_expand);
396
397 if (ei->i_inline_off)
398 ret = ext4_update_inline_data(handle, inode, len);
399 else
400 ret = ext4_create_inline_data(handle, inode, len);
401
402 ext4_write_unlock_xattr(inode, &no_expand);
403 return ret;
404 }
405
ext4_destroy_inline_data_nolock(handle_t * handle,struct inode * inode)406 static int ext4_destroy_inline_data_nolock(handle_t *handle,
407 struct inode *inode)
408 {
409 struct ext4_inode_info *ei = EXT4_I(inode);
410 struct ext4_xattr_ibody_find is = {
411 .s = { .not_found = 0, },
412 };
413 struct ext4_xattr_info i = {
414 .name_index = EXT4_XATTR_INDEX_SYSTEM,
415 .name = EXT4_XATTR_SYSTEM_DATA,
416 .value = NULL,
417 .value_len = 0,
418 };
419 int error;
420
421 if (!ei->i_inline_off)
422 return 0;
423
424 error = ext4_get_inode_loc(inode, &is.iloc);
425 if (error)
426 return error;
427
428 error = ext4_xattr_ibody_find(inode, &i, &is);
429 if (error)
430 goto out;
431
432 BUFFER_TRACE(is.iloc.bh, "get_write_access");
433 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
434 EXT4_JTR_NONE);
435 if (error)
436 goto out;
437
438 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
439 if (error)
440 goto out;
441
442 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
443 0, EXT4_MIN_INLINE_DATA_SIZE);
444 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
445
446 if (ext4_has_feature_extents(inode->i_sb)) {
447 if (S_ISDIR(inode->i_mode) ||
448 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
449 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
450 ext4_ext_tree_init(handle, inode);
451 }
452 }
453 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
454
455 get_bh(is.iloc.bh);
456 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
457
458 EXT4_I(inode)->i_inline_off = 0;
459 EXT4_I(inode)->i_inline_size = 0;
460 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
461 out:
462 brelse(is.iloc.bh);
463 if (error == -ENODATA)
464 error = 0;
465 return error;
466 }
467
ext4_read_inline_page(struct inode * inode,struct page * page)468 static int ext4_read_inline_page(struct inode *inode, struct page *page)
469 {
470 void *kaddr;
471 int ret = 0;
472 size_t len;
473 struct ext4_iloc iloc;
474
475 BUG_ON(!PageLocked(page));
476 BUG_ON(!ext4_has_inline_data(inode));
477 BUG_ON(page->index);
478
479 if (!EXT4_I(inode)->i_inline_off) {
480 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
481 inode->i_ino);
482 goto out;
483 }
484
485 ret = ext4_get_inode_loc(inode, &iloc);
486 if (ret)
487 goto out;
488
489 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
490 kaddr = kmap_atomic(page);
491 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
492 flush_dcache_page(page);
493 kunmap_atomic(kaddr);
494 zero_user_segment(page, len, PAGE_SIZE);
495 SetPageUptodate(page);
496 brelse(iloc.bh);
497
498 out:
499 return ret;
500 }
501
ext4_readpage_inline(struct inode * inode,struct page * page)502 int ext4_readpage_inline(struct inode *inode, struct page *page)
503 {
504 int ret = 0;
505
506 down_read(&EXT4_I(inode)->xattr_sem);
507 if (!ext4_has_inline_data(inode)) {
508 up_read(&EXT4_I(inode)->xattr_sem);
509 return -EAGAIN;
510 }
511
512 /*
513 * Current inline data can only exist in the 1st page,
514 * So for all the other pages, just set them uptodate.
515 */
516 if (!page->index)
517 ret = ext4_read_inline_page(inode, page);
518 else if (!PageUptodate(page)) {
519 zero_user_segment(page, 0, PAGE_SIZE);
520 SetPageUptodate(page);
521 }
522
523 up_read(&EXT4_I(inode)->xattr_sem);
524
525 unlock_page(page);
526 return ret >= 0 ? 0 : ret;
527 }
528
ext4_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags)529 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
530 struct inode *inode,
531 unsigned flags)
532 {
533 int ret, needed_blocks, no_expand;
534 handle_t *handle = NULL;
535 int retries = 0, sem_held = 0;
536 struct page *page = NULL;
537 unsigned from, to;
538 struct ext4_iloc iloc;
539
540 if (!ext4_has_inline_data(inode)) {
541 /*
542 * clear the flag so that no new write
543 * will trap here again.
544 */
545 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
546 return 0;
547 }
548
549 needed_blocks = ext4_writepage_trans_blocks(inode);
550
551 ret = ext4_get_inode_loc(inode, &iloc);
552 if (ret)
553 return ret;
554
555 retry:
556 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
557 if (IS_ERR(handle)) {
558 ret = PTR_ERR(handle);
559 handle = NULL;
560 goto out;
561 }
562
563 /* We cannot recurse into the filesystem as the transaction is already
564 * started */
565 flags |= AOP_FLAG_NOFS;
566
567 page = grab_cache_page_write_begin(mapping, 0, flags);
568 if (!page) {
569 ret = -ENOMEM;
570 goto out;
571 }
572
573 ext4_write_lock_xattr(inode, &no_expand);
574 sem_held = 1;
575 /* If some one has already done this for us, just exit. */
576 if (!ext4_has_inline_data(inode)) {
577 ret = 0;
578 goto out;
579 }
580
581 from = 0;
582 to = ext4_get_inline_size(inode);
583 if (!PageUptodate(page)) {
584 ret = ext4_read_inline_page(inode, page);
585 if (ret < 0)
586 goto out;
587 }
588
589 ret = ext4_destroy_inline_data_nolock(handle, inode);
590 if (ret)
591 goto out;
592
593 if (ext4_should_dioread_nolock(inode)) {
594 ret = __block_write_begin(page, from, to,
595 ext4_get_block_unwritten);
596 } else
597 ret = __block_write_begin(page, from, to, ext4_get_block);
598
599 if (!ret && ext4_should_journal_data(inode)) {
600 ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
601 from, to, NULL,
602 do_journal_get_write_access);
603 }
604
605 if (ret) {
606 unlock_page(page);
607 put_page(page);
608 page = NULL;
609 ext4_orphan_add(handle, inode);
610 ext4_write_unlock_xattr(inode, &no_expand);
611 sem_held = 0;
612 ext4_journal_stop(handle);
613 handle = NULL;
614 ext4_truncate_failed_write(inode);
615 /*
616 * If truncate failed early the inode might
617 * still be on the orphan list; we need to
618 * make sure the inode is removed from the
619 * orphan list in that case.
620 */
621 if (inode->i_nlink)
622 ext4_orphan_del(NULL, inode);
623 }
624
625 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
626 goto retry;
627
628 if (page)
629 block_commit_write(page, from, to);
630 out:
631 if (page) {
632 unlock_page(page);
633 put_page(page);
634 }
635 if (sem_held)
636 ext4_write_unlock_xattr(inode, &no_expand);
637 if (handle)
638 ext4_journal_stop(handle);
639 brelse(iloc.bh);
640 return ret;
641 }
642
643 /*
644 * Try to write data in the inode.
645 * If the inode has inline data, check whether the new write can be
646 * in the inode also. If not, create the page the handle, move the data
647 * to the page make it update and let the later codes create extent for it.
648 */
ext4_try_to_write_inline_data(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,unsigned flags,struct page ** pagep)649 int ext4_try_to_write_inline_data(struct address_space *mapping,
650 struct inode *inode,
651 loff_t pos, unsigned len,
652 unsigned flags,
653 struct page **pagep)
654 {
655 int ret;
656 handle_t *handle;
657 struct page *page;
658 struct ext4_iloc iloc;
659
660 if (pos + len > ext4_get_max_inline_size(inode))
661 goto convert;
662
663 ret = ext4_get_inode_loc(inode, &iloc);
664 if (ret)
665 return ret;
666
667 /*
668 * The possible write could happen in the inode,
669 * so try to reserve the space in inode first.
670 */
671 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
672 if (IS_ERR(handle)) {
673 ret = PTR_ERR(handle);
674 handle = NULL;
675 goto out;
676 }
677
678 ret = ext4_prepare_inline_data(handle, inode, pos + len);
679 if (ret && ret != -ENOSPC)
680 goto out;
681
682 /* We don't have space in inline inode, so convert it to extent. */
683 if (ret == -ENOSPC) {
684 ext4_journal_stop(handle);
685 brelse(iloc.bh);
686 goto convert;
687 }
688
689 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
690 EXT4_JTR_NONE);
691 if (ret)
692 goto out;
693
694 flags |= AOP_FLAG_NOFS;
695
696 page = grab_cache_page_write_begin(mapping, 0, flags);
697 if (!page) {
698 ret = -ENOMEM;
699 goto out;
700 }
701
702 *pagep = page;
703 down_read(&EXT4_I(inode)->xattr_sem);
704 if (!ext4_has_inline_data(inode)) {
705 ret = 0;
706 unlock_page(page);
707 put_page(page);
708 goto out_up_read;
709 }
710
711 if (!PageUptodate(page)) {
712 ret = ext4_read_inline_page(inode, page);
713 if (ret < 0) {
714 unlock_page(page);
715 put_page(page);
716 goto out_up_read;
717 }
718 }
719
720 ret = 1;
721 handle = NULL;
722 out_up_read:
723 up_read(&EXT4_I(inode)->xattr_sem);
724 out:
725 if (handle && (ret != 1))
726 ext4_journal_stop(handle);
727 brelse(iloc.bh);
728 return ret;
729 convert:
730 return ext4_convert_inline_data_to_extent(mapping,
731 inode, flags);
732 }
733
ext4_write_inline_data_end(struct inode * inode,loff_t pos,unsigned len,unsigned copied,struct page * page)734 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
735 unsigned copied, struct page *page)
736 {
737 handle_t *handle = ext4_journal_current_handle();
738 int no_expand;
739 void *kaddr;
740 struct ext4_iloc iloc;
741 int ret = 0, ret2;
742
743 if (unlikely(copied < len) && !PageUptodate(page))
744 copied = 0;
745
746 if (likely(copied)) {
747 ret = ext4_get_inode_loc(inode, &iloc);
748 if (ret) {
749 unlock_page(page);
750 put_page(page);
751 ext4_std_error(inode->i_sb, ret);
752 goto out;
753 }
754 ext4_write_lock_xattr(inode, &no_expand);
755 BUG_ON(!ext4_has_inline_data(inode));
756
757 /*
758 * ei->i_inline_off may have changed since
759 * ext4_write_begin() called
760 * ext4_try_to_write_inline_data()
761 */
762 (void) ext4_find_inline_data_nolock(inode);
763
764 kaddr = kmap_atomic(page);
765 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
766 kunmap_atomic(kaddr);
767 SetPageUptodate(page);
768 /* clear page dirty so that writepages wouldn't work for us. */
769 ClearPageDirty(page);
770
771 ext4_write_unlock_xattr(inode, &no_expand);
772 brelse(iloc.bh);
773
774 /*
775 * It's important to update i_size while still holding page
776 * lock: page writeout could otherwise come in and zero
777 * beyond i_size.
778 */
779 ext4_update_inode_size(inode, pos + copied);
780 }
781 unlock_page(page);
782 put_page(page);
783
784 /*
785 * Don't mark the inode dirty under page lock. First, it unnecessarily
786 * makes the holding time of page lock longer. Second, it forces lock
787 * ordering of page lock and transaction start for journaling
788 * filesystems.
789 */
790 if (likely(copied))
791 mark_inode_dirty(inode);
792 out:
793 /*
794 * If we didn't copy as much data as expected, we need to trim back
795 * size of xattr containing inline data.
796 */
797 if (pos + len > inode->i_size && ext4_can_truncate(inode))
798 ext4_orphan_add(handle, inode);
799
800 ret2 = ext4_journal_stop(handle);
801 if (!ret)
802 ret = ret2;
803 if (pos + len > inode->i_size) {
804 ext4_truncate_failed_write(inode);
805 /*
806 * If truncate failed early the inode might still be
807 * on the orphan list; we need to make sure the inode
808 * is removed from the orphan list in that case.
809 */
810 if (inode->i_nlink)
811 ext4_orphan_del(NULL, inode);
812 }
813 return ret ? ret : copied;
814 }
815
816 struct buffer_head *
ext4_journalled_write_inline_data(struct inode * inode,unsigned len,struct page * page)817 ext4_journalled_write_inline_data(struct inode *inode,
818 unsigned len,
819 struct page *page)
820 {
821 int ret, no_expand;
822 void *kaddr;
823 struct ext4_iloc iloc;
824
825 ret = ext4_get_inode_loc(inode, &iloc);
826 if (ret) {
827 ext4_std_error(inode->i_sb, ret);
828 return NULL;
829 }
830
831 ext4_write_lock_xattr(inode, &no_expand);
832 kaddr = kmap_atomic(page);
833 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
834 kunmap_atomic(kaddr);
835 ext4_write_unlock_xattr(inode, &no_expand);
836
837 return iloc.bh;
838 }
839
840 /*
841 * Try to make the page cache and handle ready for the inline data case.
842 * We can call this function in 2 cases:
843 * 1. The inode is created and the first write exceeds inline size. We can
844 * clear the inode state safely.
845 * 2. The inode has inline data, then we need to read the data, make it
846 * update and dirty so that ext4_da_writepages can handle it. We don't
847 * need to start the journal since the file's metadata isn't changed now.
848 */
ext4_da_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags,void ** fsdata)849 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
850 struct inode *inode,
851 unsigned flags,
852 void **fsdata)
853 {
854 int ret = 0, inline_size;
855 struct page *page;
856
857 page = grab_cache_page_write_begin(mapping, 0, flags);
858 if (!page)
859 return -ENOMEM;
860
861 down_read(&EXT4_I(inode)->xattr_sem);
862 if (!ext4_has_inline_data(inode)) {
863 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
864 goto out;
865 }
866
867 inline_size = ext4_get_inline_size(inode);
868
869 if (!PageUptodate(page)) {
870 ret = ext4_read_inline_page(inode, page);
871 if (ret < 0)
872 goto out;
873 }
874
875 ret = __block_write_begin(page, 0, inline_size,
876 ext4_da_get_block_prep);
877 if (ret) {
878 up_read(&EXT4_I(inode)->xattr_sem);
879 unlock_page(page);
880 put_page(page);
881 ext4_truncate_failed_write(inode);
882 return ret;
883 }
884
885 SetPageDirty(page);
886 SetPageUptodate(page);
887 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
888 *fsdata = (void *)CONVERT_INLINE_DATA;
889
890 out:
891 up_read(&EXT4_I(inode)->xattr_sem);
892 if (page) {
893 unlock_page(page);
894 put_page(page);
895 }
896 return ret;
897 }
898
899 /*
900 * Prepare the write for the inline data.
901 * If the data can be written into the inode, we just read
902 * the page and make it uptodate, and start the journal.
903 * Otherwise read the page, makes it dirty so that it can be
904 * handle in writepages(the i_disksize update is left to the
905 * normal ext4_da_write_end).
906 */
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)907 int ext4_da_write_inline_data_begin(struct address_space *mapping,
908 struct inode *inode,
909 loff_t pos, unsigned len,
910 unsigned flags,
911 struct page **pagep,
912 void **fsdata)
913 {
914 int ret, inline_size;
915 handle_t *handle;
916 struct page *page;
917 struct ext4_iloc iloc;
918 int retries = 0;
919
920 ret = ext4_get_inode_loc(inode, &iloc);
921 if (ret)
922 return ret;
923
924 retry_journal:
925 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
926 if (IS_ERR(handle)) {
927 ret = PTR_ERR(handle);
928 goto out;
929 }
930
931 inline_size = ext4_get_max_inline_size(inode);
932
933 ret = -ENOSPC;
934 if (inline_size >= pos + len) {
935 ret = ext4_prepare_inline_data(handle, inode, pos + len);
936 if (ret && ret != -ENOSPC)
937 goto out_journal;
938 }
939
940 /*
941 * We cannot recurse into the filesystem as the transaction
942 * is already started.
943 */
944 flags |= AOP_FLAG_NOFS;
945
946 if (ret == -ENOSPC) {
947 ext4_journal_stop(handle);
948 ret = ext4_da_convert_inline_data_to_extent(mapping,
949 inode,
950 flags,
951 fsdata);
952 if (ret == -ENOSPC &&
953 ext4_should_retry_alloc(inode->i_sb, &retries))
954 goto retry_journal;
955 goto out;
956 }
957
958 page = grab_cache_page_write_begin(mapping, 0, flags);
959 if (!page) {
960 ret = -ENOMEM;
961 goto out_journal;
962 }
963
964 down_read(&EXT4_I(inode)->xattr_sem);
965 if (!ext4_has_inline_data(inode)) {
966 ret = 0;
967 goto out_release_page;
968 }
969
970 if (!PageUptodate(page)) {
971 ret = ext4_read_inline_page(inode, page);
972 if (ret < 0)
973 goto out_release_page;
974 }
975 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
976 EXT4_JTR_NONE);
977 if (ret)
978 goto out_release_page;
979
980 up_read(&EXT4_I(inode)->xattr_sem);
981 *pagep = page;
982 brelse(iloc.bh);
983 return 1;
984 out_release_page:
985 up_read(&EXT4_I(inode)->xattr_sem);
986 unlock_page(page);
987 put_page(page);
988 out_journal:
989 ext4_journal_stop(handle);
990 out:
991 brelse(iloc.bh);
992 return ret;
993 }
994
995 #ifdef INLINE_DIR_DEBUG
ext4_show_inline_dir(struct inode * dir,struct buffer_head * bh,void * inline_start,int inline_size)996 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
997 void *inline_start, int inline_size)
998 {
999 int offset;
1000 unsigned short de_len;
1001 struct ext4_dir_entry_2 *de = inline_start;
1002 void *dlimit = inline_start + inline_size;
1003
1004 trace_printk("inode %lu\n", dir->i_ino);
1005 offset = 0;
1006 while ((void *)de < dlimit) {
1007 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1008 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1009 offset, de_len, de->name_len, de->name,
1010 de->name_len, le32_to_cpu(de->inode));
1011 if (ext4_check_dir_entry(dir, NULL, de, bh,
1012 inline_start, inline_size, offset))
1013 BUG();
1014
1015 offset += de_len;
1016 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1017 }
1018 }
1019 #else
1020 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1021 #endif
1022
1023 /*
1024 * Add a new entry into a inline dir.
1025 * It will return -ENOSPC if no space is available, and -EIO
1026 * and -EEXIST if directory entry already exists.
1027 */
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)1028 static int ext4_add_dirent_to_inline(handle_t *handle,
1029 struct ext4_filename *fname,
1030 struct inode *dir,
1031 struct inode *inode,
1032 struct ext4_iloc *iloc,
1033 void *inline_start, int inline_size)
1034 {
1035 int err;
1036 struct ext4_dir_entry_2 *de;
1037
1038 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1039 inline_size, fname, &de);
1040 if (err)
1041 return err;
1042
1043 BUFFER_TRACE(iloc->bh, "get_write_access");
1044 err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1045 EXT4_JTR_NONE);
1046 if (err)
1047 return err;
1048 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1049
1050 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1051
1052 /*
1053 * XXX shouldn't update any times until successful
1054 * completion of syscall, but too many callers depend
1055 * on this.
1056 *
1057 * XXX similarly, too many callers depend on
1058 * ext4_new_inode() setting the times, but error
1059 * recovery deletes the inode, so the worst that can
1060 * happen is that the times are slightly out of date
1061 * and/or different from the directory change time.
1062 */
1063 dir->i_mtime = dir->i_ctime = current_time(dir);
1064 ext4_update_dx_flag(dir);
1065 inode_inc_iversion(dir);
1066 return 1;
1067 }
1068
ext4_get_inline_xattr_pos(struct inode * inode,struct ext4_iloc * iloc)1069 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1070 struct ext4_iloc *iloc)
1071 {
1072 struct ext4_xattr_entry *entry;
1073 struct ext4_xattr_ibody_header *header;
1074
1075 BUG_ON(!EXT4_I(inode)->i_inline_off);
1076
1077 header = IHDR(inode, ext4_raw_inode(iloc));
1078 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1079 EXT4_I(inode)->i_inline_off);
1080
1081 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1082 }
1083
1084 /* Set the final de to cover the whole block. */
ext4_update_final_de(void * de_buf,int old_size,int new_size)1085 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1086 {
1087 struct ext4_dir_entry_2 *de, *prev_de;
1088 void *limit;
1089 int de_len;
1090
1091 de = (struct ext4_dir_entry_2 *)de_buf;
1092 if (old_size) {
1093 limit = de_buf + old_size;
1094 do {
1095 prev_de = de;
1096 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1097 de_buf += de_len;
1098 de = (struct ext4_dir_entry_2 *)de_buf;
1099 } while (de_buf < limit);
1100
1101 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1102 old_size, new_size);
1103 } else {
1104 /* this is just created, so create an empty entry. */
1105 de->inode = 0;
1106 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1107 }
1108 }
1109
ext4_update_inline_dir(handle_t * handle,struct inode * dir,struct ext4_iloc * iloc)1110 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1111 struct ext4_iloc *iloc)
1112 {
1113 int ret;
1114 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1115 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1116
1117 if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1118 return -ENOSPC;
1119
1120 ret = ext4_update_inline_data(handle, dir,
1121 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1122 if (ret)
1123 return ret;
1124
1125 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1126 EXT4_I(dir)->i_inline_size -
1127 EXT4_MIN_INLINE_DATA_SIZE);
1128 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1129 return 0;
1130 }
1131
ext4_restore_inline_data(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc,void * buf,int inline_size)1132 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1133 struct ext4_iloc *iloc,
1134 void *buf, int inline_size)
1135 {
1136 ext4_create_inline_data(handle, inode, inline_size);
1137 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1138 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1139 }
1140
ext4_finish_convert_inline_dir(handle_t * handle,struct inode * inode,struct buffer_head * dir_block,void * buf,int inline_size)1141 static int ext4_finish_convert_inline_dir(handle_t *handle,
1142 struct inode *inode,
1143 struct buffer_head *dir_block,
1144 void *buf,
1145 int inline_size)
1146 {
1147 int err, csum_size = 0, header_size = 0;
1148 struct ext4_dir_entry_2 *de;
1149 void *target = dir_block->b_data;
1150
1151 /*
1152 * First create "." and ".." and then copy the dir information
1153 * back to the block.
1154 */
1155 de = (struct ext4_dir_entry_2 *)target;
1156 de = ext4_init_dot_dotdot(inode, de,
1157 inode->i_sb->s_blocksize, csum_size,
1158 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1159 header_size = (void *)de - target;
1160
1161 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1162 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1163
1164 if (ext4_has_metadata_csum(inode->i_sb))
1165 csum_size = sizeof(struct ext4_dir_entry_tail);
1166
1167 inode->i_size = inode->i_sb->s_blocksize;
1168 i_size_write(inode, inode->i_sb->s_blocksize);
1169 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1170 ext4_update_final_de(dir_block->b_data,
1171 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1172 inode->i_sb->s_blocksize - csum_size);
1173
1174 if (csum_size)
1175 ext4_initialize_dirent_tail(dir_block,
1176 inode->i_sb->s_blocksize);
1177 set_buffer_uptodate(dir_block);
1178 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1179 if (err)
1180 return err;
1181 set_buffer_verified(dir_block);
1182 return ext4_mark_inode_dirty(handle, inode);
1183 }
1184
ext4_convert_inline_data_nolock(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc)1185 static int ext4_convert_inline_data_nolock(handle_t *handle,
1186 struct inode *inode,
1187 struct ext4_iloc *iloc)
1188 {
1189 int error;
1190 void *buf = NULL;
1191 struct buffer_head *data_bh = NULL;
1192 struct ext4_map_blocks map;
1193 int inline_size;
1194
1195 inline_size = ext4_get_inline_size(inode);
1196 buf = kmalloc(inline_size, GFP_NOFS);
1197 if (!buf) {
1198 error = -ENOMEM;
1199 goto out;
1200 }
1201
1202 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1203 if (error < 0)
1204 goto out;
1205
1206 /*
1207 * Make sure the inline directory entries pass checks before we try to
1208 * convert them, so that we avoid touching stuff that needs fsck.
1209 */
1210 if (S_ISDIR(inode->i_mode)) {
1211 error = ext4_check_all_de(inode, iloc->bh,
1212 buf + EXT4_INLINE_DOTDOT_SIZE,
1213 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1214 if (error)
1215 goto out;
1216 }
1217
1218 error = ext4_destroy_inline_data_nolock(handle, inode);
1219 if (error)
1220 goto out;
1221
1222 map.m_lblk = 0;
1223 map.m_len = 1;
1224 map.m_flags = 0;
1225 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1226 if (error < 0)
1227 goto out_restore;
1228 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1229 error = -EIO;
1230 goto out_restore;
1231 }
1232
1233 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1234 if (!data_bh) {
1235 error = -ENOMEM;
1236 goto out_restore;
1237 }
1238
1239 lock_buffer(data_bh);
1240 error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1241 EXT4_JTR_NONE);
1242 if (error) {
1243 unlock_buffer(data_bh);
1244 error = -EIO;
1245 goto out_restore;
1246 }
1247 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1248
1249 if (!S_ISDIR(inode->i_mode)) {
1250 memcpy(data_bh->b_data, buf, inline_size);
1251 set_buffer_uptodate(data_bh);
1252 error = ext4_handle_dirty_metadata(handle,
1253 inode, data_bh);
1254 } else {
1255 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1256 buf, inline_size);
1257 }
1258
1259 unlock_buffer(data_bh);
1260 out_restore:
1261 if (error)
1262 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1263
1264 out:
1265 brelse(data_bh);
1266 kfree(buf);
1267 return error;
1268 }
1269
1270 /*
1271 * Try to add the new entry to the inline data.
1272 * If succeeds, return 0. If not, extended the inline dir and copied data to
1273 * the new created block.
1274 */
ext4_try_add_inline_entry(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode)1275 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1276 struct inode *dir, struct inode *inode)
1277 {
1278 int ret, ret2, inline_size, no_expand;
1279 void *inline_start;
1280 struct ext4_iloc iloc;
1281
1282 ret = ext4_get_inode_loc(dir, &iloc);
1283 if (ret)
1284 return ret;
1285
1286 ext4_write_lock_xattr(dir, &no_expand);
1287 if (!ext4_has_inline_data(dir))
1288 goto out;
1289
1290 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1291 EXT4_INLINE_DOTDOT_SIZE;
1292 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1293
1294 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1295 inline_start, inline_size);
1296 if (ret != -ENOSPC)
1297 goto out;
1298
1299 /* check whether it can be inserted to inline xattr space. */
1300 inline_size = EXT4_I(dir)->i_inline_size -
1301 EXT4_MIN_INLINE_DATA_SIZE;
1302 if (!inline_size) {
1303 /* Try to use the xattr space.*/
1304 ret = ext4_update_inline_dir(handle, dir, &iloc);
1305 if (ret && ret != -ENOSPC)
1306 goto out;
1307
1308 inline_size = EXT4_I(dir)->i_inline_size -
1309 EXT4_MIN_INLINE_DATA_SIZE;
1310 }
1311
1312 if (inline_size) {
1313 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1314
1315 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1316 inode, &iloc, inline_start,
1317 inline_size);
1318
1319 if (ret != -ENOSPC)
1320 goto out;
1321 }
1322
1323 /*
1324 * The inline space is filled up, so create a new block for it.
1325 * As the extent tree will be created, we have to save the inline
1326 * dir first.
1327 */
1328 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1329
1330 out:
1331 ext4_write_unlock_xattr(dir, &no_expand);
1332 ret2 = ext4_mark_inode_dirty(handle, dir);
1333 if (unlikely(ret2 && !ret))
1334 ret = ret2;
1335 brelse(iloc.bh);
1336 return ret;
1337 }
1338
1339 /*
1340 * This function fills a red-black tree with information from an
1341 * inlined dir. It returns the number directory entries loaded
1342 * into the tree. If there is an error it is returned in err.
1343 */
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)1344 int ext4_inlinedir_to_tree(struct file *dir_file,
1345 struct inode *dir, ext4_lblk_t block,
1346 struct dx_hash_info *hinfo,
1347 __u32 start_hash, __u32 start_minor_hash,
1348 int *has_inline_data)
1349 {
1350 int err = 0, count = 0;
1351 unsigned int parent_ino;
1352 int pos;
1353 struct ext4_dir_entry_2 *de;
1354 struct inode *inode = file_inode(dir_file);
1355 int ret, inline_size = 0;
1356 struct ext4_iloc iloc;
1357 void *dir_buf = NULL;
1358 struct ext4_dir_entry_2 fake;
1359 struct fscrypt_str tmp_str;
1360
1361 ret = ext4_get_inode_loc(inode, &iloc);
1362 if (ret)
1363 return ret;
1364
1365 down_read(&EXT4_I(inode)->xattr_sem);
1366 if (!ext4_has_inline_data(inode)) {
1367 up_read(&EXT4_I(inode)->xattr_sem);
1368 *has_inline_data = 0;
1369 goto out;
1370 }
1371
1372 inline_size = ext4_get_inline_size(inode);
1373 dir_buf = kmalloc(inline_size, GFP_NOFS);
1374 if (!dir_buf) {
1375 ret = -ENOMEM;
1376 up_read(&EXT4_I(inode)->xattr_sem);
1377 goto out;
1378 }
1379
1380 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1381 up_read(&EXT4_I(inode)->xattr_sem);
1382 if (ret < 0)
1383 goto out;
1384
1385 pos = 0;
1386 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1387 while (pos < inline_size) {
1388 /*
1389 * As inlined dir doesn't store any information about '.' and
1390 * only the inode number of '..' is stored, we have to handle
1391 * them differently.
1392 */
1393 if (pos == 0) {
1394 fake.inode = cpu_to_le32(inode->i_ino);
1395 fake.name_len = 1;
1396 strcpy(fake.name, ".");
1397 fake.rec_len = ext4_rec_len_to_disk(
1398 ext4_dir_rec_len(fake.name_len, NULL),
1399 inline_size);
1400 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1401 de = &fake;
1402 pos = EXT4_INLINE_DOTDOT_OFFSET;
1403 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1404 fake.inode = cpu_to_le32(parent_ino);
1405 fake.name_len = 2;
1406 strcpy(fake.name, "..");
1407 fake.rec_len = ext4_rec_len_to_disk(
1408 ext4_dir_rec_len(fake.name_len, NULL),
1409 inline_size);
1410 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1411 de = &fake;
1412 pos = EXT4_INLINE_DOTDOT_SIZE;
1413 } else {
1414 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1415 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1416 if (ext4_check_dir_entry(inode, dir_file, de,
1417 iloc.bh, dir_buf,
1418 inline_size, pos)) {
1419 ret = count;
1420 goto out;
1421 }
1422 }
1423
1424 if (ext4_hash_in_dirent(dir)) {
1425 hinfo->hash = EXT4_DIRENT_HASH(de);
1426 hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1427 } else {
1428 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1429 }
1430 if ((hinfo->hash < start_hash) ||
1431 ((hinfo->hash == start_hash) &&
1432 (hinfo->minor_hash < start_minor_hash)))
1433 continue;
1434 if (de->inode == 0)
1435 continue;
1436 tmp_str.name = de->name;
1437 tmp_str.len = de->name_len;
1438 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1439 hinfo->minor_hash, de, &tmp_str);
1440 if (err) {
1441 ret = err;
1442 goto out;
1443 }
1444 count++;
1445 }
1446 ret = count;
1447 out:
1448 kfree(dir_buf);
1449 brelse(iloc.bh);
1450 return ret;
1451 }
1452
1453 /*
1454 * So this function is called when the volume is mkfsed with
1455 * dir_index disabled. In order to keep f_pos persistent
1456 * after we convert from an inlined dir to a blocked based,
1457 * we just pretend that we are a normal dir and return the
1458 * offset as if '.' and '..' really take place.
1459 *
1460 */
ext4_read_inline_dir(struct file * file,struct dir_context * ctx,int * has_inline_data)1461 int ext4_read_inline_dir(struct file *file,
1462 struct dir_context *ctx,
1463 int *has_inline_data)
1464 {
1465 unsigned int offset, parent_ino;
1466 int i;
1467 struct ext4_dir_entry_2 *de;
1468 struct super_block *sb;
1469 struct inode *inode = file_inode(file);
1470 int ret, inline_size = 0;
1471 struct ext4_iloc iloc;
1472 void *dir_buf = NULL;
1473 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1474
1475 ret = ext4_get_inode_loc(inode, &iloc);
1476 if (ret)
1477 return ret;
1478
1479 down_read(&EXT4_I(inode)->xattr_sem);
1480 if (!ext4_has_inline_data(inode)) {
1481 up_read(&EXT4_I(inode)->xattr_sem);
1482 *has_inline_data = 0;
1483 goto out;
1484 }
1485
1486 inline_size = ext4_get_inline_size(inode);
1487 dir_buf = kmalloc(inline_size, GFP_NOFS);
1488 if (!dir_buf) {
1489 ret = -ENOMEM;
1490 up_read(&EXT4_I(inode)->xattr_sem);
1491 goto out;
1492 }
1493
1494 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1495 up_read(&EXT4_I(inode)->xattr_sem);
1496 if (ret < 0)
1497 goto out;
1498
1499 ret = 0;
1500 sb = inode->i_sb;
1501 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1502 offset = ctx->pos;
1503
1504 /*
1505 * dotdot_offset and dotdot_size is the real offset and
1506 * size for ".." and "." if the dir is block based while
1507 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1508 * So we will use extra_offset and extra_size to indicate them
1509 * during the inline dir iteration.
1510 */
1511 dotdot_offset = ext4_dir_rec_len(1, NULL);
1512 dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1513 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1514 extra_size = extra_offset + inline_size;
1515
1516 /*
1517 * If the version has changed since the last call to
1518 * readdir(2), then we might be pointing to an invalid
1519 * dirent right now. Scan from the start of the inline
1520 * dir to make sure.
1521 */
1522 if (!inode_eq_iversion(inode, file->f_version)) {
1523 for (i = 0; i < extra_size && i < offset;) {
1524 /*
1525 * "." is with offset 0 and
1526 * ".." is dotdot_offset.
1527 */
1528 if (!i) {
1529 i = dotdot_offset;
1530 continue;
1531 } else if (i == dotdot_offset) {
1532 i = dotdot_size;
1533 continue;
1534 }
1535 /* for other entry, the real offset in
1536 * the buf has to be tuned accordingly.
1537 */
1538 de = (struct ext4_dir_entry_2 *)
1539 (dir_buf + i - extra_offset);
1540 /* It's too expensive to do a full
1541 * dirent test each time round this
1542 * loop, but we do have to test at
1543 * least that it is non-zero. A
1544 * failure will be detected in the
1545 * dirent test below. */
1546 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1547 < ext4_dir_rec_len(1, NULL))
1548 break;
1549 i += ext4_rec_len_from_disk(de->rec_len,
1550 extra_size);
1551 }
1552 offset = i;
1553 ctx->pos = offset;
1554 file->f_version = inode_query_iversion(inode);
1555 }
1556
1557 while (ctx->pos < extra_size) {
1558 if (ctx->pos == 0) {
1559 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1560 goto out;
1561 ctx->pos = dotdot_offset;
1562 continue;
1563 }
1564
1565 if (ctx->pos == dotdot_offset) {
1566 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1567 goto out;
1568 ctx->pos = dotdot_size;
1569 continue;
1570 }
1571
1572 de = (struct ext4_dir_entry_2 *)
1573 (dir_buf + ctx->pos - extra_offset);
1574 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1575 extra_size, ctx->pos))
1576 goto out;
1577 if (le32_to_cpu(de->inode)) {
1578 if (!dir_emit(ctx, de->name, de->name_len,
1579 le32_to_cpu(de->inode),
1580 get_dtype(sb, de->file_type)))
1581 goto out;
1582 }
1583 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1584 }
1585 out:
1586 kfree(dir_buf);
1587 brelse(iloc.bh);
1588 return ret;
1589 }
1590
ext4_get_first_inline_block(struct inode * inode,struct ext4_dir_entry_2 ** parent_de,int * retval)1591 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1592 struct ext4_dir_entry_2 **parent_de,
1593 int *retval)
1594 {
1595 struct ext4_iloc iloc;
1596
1597 *retval = ext4_get_inode_loc(inode, &iloc);
1598 if (*retval)
1599 return NULL;
1600
1601 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1602
1603 return iloc.bh;
1604 }
1605
1606 /*
1607 * Try to create the inline data for the new dir.
1608 * If it succeeds, return 0, otherwise return the error.
1609 * In case of ENOSPC, the caller should create the normal disk layout dir.
1610 */
ext4_try_create_inline_dir(handle_t * handle,struct inode * parent,struct inode * inode)1611 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1612 struct inode *inode)
1613 {
1614 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1615 struct ext4_iloc iloc;
1616 struct ext4_dir_entry_2 *de;
1617
1618 ret = ext4_get_inode_loc(inode, &iloc);
1619 if (ret)
1620 return ret;
1621
1622 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1623 if (ret)
1624 goto out;
1625
1626 /*
1627 * For inline dir, we only save the inode information for the ".."
1628 * and create a fake dentry to cover the left space.
1629 */
1630 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1631 de->inode = cpu_to_le32(parent->i_ino);
1632 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1633 de->inode = 0;
1634 de->rec_len = ext4_rec_len_to_disk(
1635 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1636 inline_size);
1637 set_nlink(inode, 2);
1638 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1639 out:
1640 brelse(iloc.bh);
1641 return ret;
1642 }
1643
ext4_find_inline_entry(struct inode * dir,struct ext4_filename * fname,struct ext4_dir_entry_2 ** res_dir,int * has_inline_data)1644 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1645 struct ext4_filename *fname,
1646 struct ext4_dir_entry_2 **res_dir,
1647 int *has_inline_data)
1648 {
1649 int ret;
1650 struct ext4_iloc iloc;
1651 void *inline_start;
1652 int inline_size;
1653
1654 if (ext4_get_inode_loc(dir, &iloc))
1655 return NULL;
1656
1657 down_read(&EXT4_I(dir)->xattr_sem);
1658 if (!ext4_has_inline_data(dir)) {
1659 *has_inline_data = 0;
1660 goto out;
1661 }
1662
1663 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1664 EXT4_INLINE_DOTDOT_SIZE;
1665 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
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 if (ret < 0)
1671 goto out;
1672
1673 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1674 goto out;
1675
1676 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1677 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1678
1679 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1680 dir, fname, 0, res_dir);
1681 if (ret == 1)
1682 goto out_find;
1683
1684 out:
1685 brelse(iloc.bh);
1686 iloc.bh = NULL;
1687 out_find:
1688 up_read(&EXT4_I(dir)->xattr_sem);
1689 return iloc.bh;
1690 }
1691
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)1692 int ext4_delete_inline_entry(handle_t *handle,
1693 struct inode *dir,
1694 struct ext4_dir_entry_2 *de_del,
1695 struct buffer_head *bh,
1696 int *has_inline_data)
1697 {
1698 int err, inline_size, no_expand;
1699 struct ext4_iloc iloc;
1700 void *inline_start;
1701
1702 err = ext4_get_inode_loc(dir, &iloc);
1703 if (err)
1704 return err;
1705
1706 ext4_write_lock_xattr(dir, &no_expand);
1707 if (!ext4_has_inline_data(dir)) {
1708 *has_inline_data = 0;
1709 goto out;
1710 }
1711
1712 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1713 EXT4_MIN_INLINE_DATA_SIZE) {
1714 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1715 EXT4_INLINE_DOTDOT_SIZE;
1716 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1717 EXT4_INLINE_DOTDOT_SIZE;
1718 } else {
1719 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1720 inline_size = ext4_get_inline_size(dir) -
1721 EXT4_MIN_INLINE_DATA_SIZE;
1722 }
1723
1724 BUFFER_TRACE(bh, "get_write_access");
1725 err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1726 EXT4_JTR_NONE);
1727 if (err)
1728 goto out;
1729
1730 err = ext4_generic_delete_entry(dir, de_del, bh,
1731 inline_start, inline_size, 0);
1732 if (err)
1733 goto out;
1734
1735 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1736 out:
1737 ext4_write_unlock_xattr(dir, &no_expand);
1738 if (likely(err == 0))
1739 err = ext4_mark_inode_dirty(handle, dir);
1740 brelse(iloc.bh);
1741 if (err != -ENOENT)
1742 ext4_std_error(dir->i_sb, err);
1743 return err;
1744 }
1745
1746 /*
1747 * Get the inline dentry at offset.
1748 */
1749 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)1750 ext4_get_inline_entry(struct inode *inode,
1751 struct ext4_iloc *iloc,
1752 unsigned int offset,
1753 void **inline_start,
1754 int *inline_size)
1755 {
1756 void *inline_pos;
1757
1758 BUG_ON(offset > ext4_get_inline_size(inode));
1759
1760 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1761 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1762 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1763 } else {
1764 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1765 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1766 *inline_size = ext4_get_inline_size(inode) -
1767 EXT4_MIN_INLINE_DATA_SIZE;
1768 }
1769
1770 if (inline_start)
1771 *inline_start = inline_pos;
1772 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1773 }
1774
empty_inline_dir(struct inode * dir,int * has_inline_data)1775 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1776 {
1777 int err, inline_size;
1778 struct ext4_iloc iloc;
1779 size_t inline_len;
1780 void *inline_pos;
1781 unsigned int offset;
1782 struct ext4_dir_entry_2 *de;
1783 bool ret = true;
1784
1785 err = ext4_get_inode_loc(dir, &iloc);
1786 if (err) {
1787 EXT4_ERROR_INODE_ERR(dir, -err,
1788 "error %d getting inode %lu block",
1789 err, dir->i_ino);
1790 return true;
1791 }
1792
1793 down_read(&EXT4_I(dir)->xattr_sem);
1794 if (!ext4_has_inline_data(dir)) {
1795 *has_inline_data = 0;
1796 goto out;
1797 }
1798
1799 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1800 if (!le32_to_cpu(de->inode)) {
1801 ext4_warning(dir->i_sb,
1802 "bad inline directory (dir #%lu) - no `..'",
1803 dir->i_ino);
1804 ret = true;
1805 goto out;
1806 }
1807
1808 inline_len = ext4_get_inline_size(dir);
1809 offset = EXT4_INLINE_DOTDOT_SIZE;
1810 while (offset < inline_len) {
1811 de = ext4_get_inline_entry(dir, &iloc, offset,
1812 &inline_pos, &inline_size);
1813 if (ext4_check_dir_entry(dir, NULL, de,
1814 iloc.bh, inline_pos,
1815 inline_size, offset)) {
1816 ext4_warning(dir->i_sb,
1817 "bad inline directory (dir #%lu) - "
1818 "inode %u, rec_len %u, name_len %d"
1819 "inline size %d",
1820 dir->i_ino, le32_to_cpu(de->inode),
1821 le16_to_cpu(de->rec_len), de->name_len,
1822 inline_size);
1823 ret = true;
1824 goto out;
1825 }
1826 if (le32_to_cpu(de->inode)) {
1827 ret = false;
1828 goto out;
1829 }
1830 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1831 }
1832
1833 out:
1834 up_read(&EXT4_I(dir)->xattr_sem);
1835 brelse(iloc.bh);
1836 return ret;
1837 }
1838
ext4_destroy_inline_data(handle_t * handle,struct inode * inode)1839 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1840 {
1841 int ret, no_expand;
1842
1843 ext4_write_lock_xattr(inode, &no_expand);
1844 ret = ext4_destroy_inline_data_nolock(handle, inode);
1845 ext4_write_unlock_xattr(inode, &no_expand);
1846
1847 return ret;
1848 }
1849
ext4_inline_data_iomap(struct inode * inode,struct iomap * iomap)1850 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1851 {
1852 __u64 addr;
1853 int error = -EAGAIN;
1854 struct ext4_iloc iloc;
1855
1856 down_read(&EXT4_I(inode)->xattr_sem);
1857 if (!ext4_has_inline_data(inode))
1858 goto out;
1859
1860 error = ext4_get_inode_loc(inode, &iloc);
1861 if (error)
1862 goto out;
1863
1864 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1865 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1866 addr += offsetof(struct ext4_inode, i_block);
1867
1868 brelse(iloc.bh);
1869
1870 iomap->addr = addr;
1871 iomap->offset = 0;
1872 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1873 i_size_read(inode));
1874 iomap->type = IOMAP_INLINE;
1875 iomap->flags = 0;
1876
1877 out:
1878 up_read(&EXT4_I(inode)->xattr_sem);
1879 return error;
1880 }
1881
ext4_inline_data_truncate(struct inode * inode,int * has_inline)1882 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1883 {
1884 handle_t *handle;
1885 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1886 size_t i_size;
1887 void *value = NULL;
1888 struct ext4_xattr_ibody_find is = {
1889 .s = { .not_found = -ENODATA, },
1890 };
1891 struct ext4_xattr_info i = {
1892 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1893 .name = EXT4_XATTR_SYSTEM_DATA,
1894 };
1895
1896
1897 needed_blocks = ext4_writepage_trans_blocks(inode);
1898 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1899 if (IS_ERR(handle))
1900 return PTR_ERR(handle);
1901
1902 ext4_write_lock_xattr(inode, &no_expand);
1903 if (!ext4_has_inline_data(inode)) {
1904 ext4_write_unlock_xattr(inode, &no_expand);
1905 *has_inline = 0;
1906 ext4_journal_stop(handle);
1907 return 0;
1908 }
1909
1910 if ((err = ext4_orphan_add(handle, inode)) != 0)
1911 goto out;
1912
1913 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1914 goto out;
1915
1916 down_write(&EXT4_I(inode)->i_data_sem);
1917 i_size = inode->i_size;
1918 inline_size = ext4_get_inline_size(inode);
1919 EXT4_I(inode)->i_disksize = i_size;
1920
1921 if (i_size < inline_size) {
1922 /*
1923 * if there's inline data to truncate and this file was
1924 * converted to extents after that inline data was written,
1925 * the extent status cache must be cleared to avoid leaving
1926 * behind stale delayed allocated extent entries
1927 */
1928 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1929 retry:
1930 err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1931 if (err == -ENOMEM) {
1932 cond_resched();
1933 congestion_wait(BLK_RW_ASYNC, HZ/50);
1934 goto retry;
1935 }
1936 if (err)
1937 goto out_error;
1938 }
1939
1940 /* Clear the content in the xattr space. */
1941 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1942 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1943 goto out_error;
1944
1945 BUG_ON(is.s.not_found);
1946
1947 value_len = le32_to_cpu(is.s.here->e_value_size);
1948 value = kmalloc(value_len, GFP_NOFS);
1949 if (!value) {
1950 err = -ENOMEM;
1951 goto out_error;
1952 }
1953
1954 err = ext4_xattr_ibody_get(inode, i.name_index,
1955 i.name, value, value_len);
1956 if (err <= 0)
1957 goto out_error;
1958
1959 i.value = value;
1960 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1961 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1962 err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1963 if (err)
1964 goto out_error;
1965 }
1966
1967 /* Clear the content within i_blocks. */
1968 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1969 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1970 memset(p + i_size, 0,
1971 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1972 }
1973
1974 EXT4_I(inode)->i_inline_size = i_size <
1975 EXT4_MIN_INLINE_DATA_SIZE ?
1976 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1977 }
1978
1979 out_error:
1980 up_write(&EXT4_I(inode)->i_data_sem);
1981 out:
1982 brelse(is.iloc.bh);
1983 ext4_write_unlock_xattr(inode, &no_expand);
1984 kfree(value);
1985 if (inode->i_nlink)
1986 ext4_orphan_del(handle, inode);
1987
1988 if (err == 0) {
1989 inode->i_mtime = inode->i_ctime = current_time(inode);
1990 err = ext4_mark_inode_dirty(handle, inode);
1991 if (IS_SYNC(inode))
1992 ext4_handle_sync(handle);
1993 }
1994 ext4_journal_stop(handle);
1995 return err;
1996 }
1997
ext4_convert_inline_data(struct inode * inode)1998 int ext4_convert_inline_data(struct inode *inode)
1999 {
2000 int error, needed_blocks, no_expand;
2001 handle_t *handle;
2002 struct ext4_iloc iloc;
2003
2004 if (!ext4_has_inline_data(inode)) {
2005 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2006 return 0;
2007 }
2008
2009 needed_blocks = ext4_writepage_trans_blocks(inode);
2010
2011 iloc.bh = NULL;
2012 error = ext4_get_inode_loc(inode, &iloc);
2013 if (error)
2014 return error;
2015
2016 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2017 if (IS_ERR(handle)) {
2018 error = PTR_ERR(handle);
2019 goto out_free;
2020 }
2021
2022 ext4_write_lock_xattr(inode, &no_expand);
2023 if (ext4_has_inline_data(inode))
2024 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2025 ext4_write_unlock_xattr(inode, &no_expand);
2026 ext4_journal_stop(handle);
2027 out_free:
2028 brelse(iloc.bh);
2029 return error;
2030 }
2031
