Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git...
[muen/linux.git] / fs / ext4 / inline.c
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
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
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  */
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(inode, __func__, __LINE__, 0,
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  */
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
164 static int ext4_read_inline_data(struct inode *inode, void *buffer,
165                                  unsigned int len,
166                                  struct ext4_iloc *iloc)
167 {
168         struct ext4_xattr_entry *entry;
169         struct ext4_xattr_ibody_header *header;
170         int cp_len = 0;
171         struct ext4_inode *raw_inode;
172
173         if (!len)
174                 return 0;
175
176         BUG_ON(len > EXT4_I(inode)->i_inline_size);
177
178         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
179                         len : EXT4_MIN_INLINE_DATA_SIZE;
180
181         raw_inode = ext4_raw_inode(iloc);
182         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
183
184         len -= cp_len;
185         buffer += cp_len;
186
187         if (!len)
188                 goto out;
189
190         header = IHDR(inode, raw_inode);
191         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
192                                             EXT4_I(inode)->i_inline_off);
193         len = min_t(unsigned int, len,
194                     (unsigned int)le32_to_cpu(entry->e_value_size));
195
196         memcpy(buffer,
197                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
198         cp_len += len;
199
200 out:
201         return cp_len;
202 }
203
204 /*
205  * write the buffer to the inline inode.
206  * If 'create' is set, we don't need to do the extra copy in the xattr
207  * value since it is already handled by ext4_xattr_ibody_inline_set.
208  * That saves us one memcpy.
209  */
210 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
211                                    void *buffer, loff_t pos, unsigned int len)
212 {
213         struct ext4_xattr_entry *entry;
214         struct ext4_xattr_ibody_header *header;
215         struct ext4_inode *raw_inode;
216         int cp_len = 0;
217
218         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
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 the xttr entry. */
280         i.value = value;
281         i.value_len = len;
282
283         error = ext4_xattr_ibody_find(inode, &i, &is);
284         if (error)
285                 goto out;
286
287         BUG_ON(!is.s.not_found);
288
289         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
290         if (error) {
291                 if (error == -ENOSPC)
292                         ext4_clear_inode_state(inode,
293                                                EXT4_STATE_MAY_INLINE_DATA);
294                 goto out;
295         }
296
297         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
298                 0, EXT4_MIN_INLINE_DATA_SIZE);
299
300         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
301                                       (void *)ext4_raw_inode(&is.iloc));
302         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
303         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
304         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
305         get_bh(is.iloc.bh);
306         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
307
308 out:
309         brelse(is.iloc.bh);
310         return error;
311 }
312
313 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
314                                    unsigned int len)
315 {
316         int error;
317         void *value = NULL;
318         struct ext4_xattr_ibody_find is = {
319                 .s = { .not_found = -ENODATA, },
320         };
321         struct ext4_xattr_info i = {
322                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
323                 .name = EXT4_XATTR_SYSTEM_DATA,
324         };
325
326         /* If the old space is ok, write the data directly. */
327         if (len <= EXT4_I(inode)->i_inline_size)
328                 return 0;
329
330         error = ext4_get_inode_loc(inode, &is.iloc);
331         if (error)
332                 return error;
333
334         error = ext4_xattr_ibody_find(inode, &i, &is);
335         if (error)
336                 goto out;
337
338         BUG_ON(is.s.not_found);
339
340         len -= EXT4_MIN_INLINE_DATA_SIZE;
341         value = kzalloc(len, GFP_NOFS);
342         if (!value) {
343                 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 xttr 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
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
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
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
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
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  */
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         flags |= AOP_FLAG_NOFS;
686
687         page = grab_cache_page_write_begin(mapping, 0, flags);
688         if (!page) {
689                 ret = -ENOMEM;
690                 goto out;
691         }
692
693         *pagep = page;
694         down_read(&EXT4_I(inode)->xattr_sem);
695         if (!ext4_has_inline_data(inode)) {
696                 ret = 0;
697                 unlock_page(page);
698                 put_page(page);
699                 goto out_up_read;
700         }
701
702         if (!PageUptodate(page)) {
703                 ret = ext4_read_inline_page(inode, page);
704                 if (ret < 0)
705                         goto out_up_read;
706         }
707
708         ret = 1;
709         handle = NULL;
710 out_up_read:
711         up_read(&EXT4_I(inode)->xattr_sem);
712 out:
713         if (handle)
714                 ext4_journal_stop(handle);
715         brelse(iloc.bh);
716         return ret;
717 convert:
718         return ext4_convert_inline_data_to_extent(mapping,
719                                                   inode, flags);
720 }
721
722 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
723                                unsigned copied, struct page *page)
724 {
725         int ret, no_expand;
726         void *kaddr;
727         struct ext4_iloc iloc;
728
729         if (unlikely(copied < len)) {
730                 if (!PageUptodate(page)) {
731                         copied = 0;
732                         goto out;
733                 }
734         }
735
736         ret = ext4_get_inode_loc(inode, &iloc);
737         if (ret) {
738                 ext4_std_error(inode->i_sb, ret);
739                 copied = 0;
740                 goto out;
741         }
742
743         ext4_write_lock_xattr(inode, &no_expand);
744         BUG_ON(!ext4_has_inline_data(inode));
745
746         kaddr = kmap_atomic(page);
747         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
748         kunmap_atomic(kaddr);
749         SetPageUptodate(page);
750         /* clear page dirty so that writepages wouldn't work for us. */
751         ClearPageDirty(page);
752
753         ext4_write_unlock_xattr(inode, &no_expand);
754         brelse(iloc.bh);
755 out:
756         return copied;
757 }
758
759 struct buffer_head *
760 ext4_journalled_write_inline_data(struct inode *inode,
761                                   unsigned len,
762                                   struct page *page)
763 {
764         int ret, no_expand;
765         void *kaddr;
766         struct ext4_iloc iloc;
767
768         ret = ext4_get_inode_loc(inode, &iloc);
769         if (ret) {
770                 ext4_std_error(inode->i_sb, ret);
771                 return NULL;
772         }
773
774         ext4_write_lock_xattr(inode, &no_expand);
775         kaddr = kmap_atomic(page);
776         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
777         kunmap_atomic(kaddr);
778         ext4_write_unlock_xattr(inode, &no_expand);
779
780         return iloc.bh;
781 }
782
783 /*
784  * Try to make the page cache and handle ready for the inline data case.
785  * We can call this function in 2 cases:
786  * 1. The inode is created and the first write exceeds inline size. We can
787  *    clear the inode state safely.
788  * 2. The inode has inline data, then we need to read the data, make it
789  *    update and dirty so that ext4_da_writepages can handle it. We don't
790  *    need to start the journal since the file's metatdata isn't changed now.
791  */
792 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
793                                                  struct inode *inode,
794                                                  unsigned flags,
795                                                  void **fsdata)
796 {
797         int ret = 0, inline_size;
798         struct page *page;
799
800         page = grab_cache_page_write_begin(mapping, 0, flags);
801         if (!page)
802                 return -ENOMEM;
803
804         down_read(&EXT4_I(inode)->xattr_sem);
805         if (!ext4_has_inline_data(inode)) {
806                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
807                 goto out;
808         }
809
810         inline_size = ext4_get_inline_size(inode);
811
812         if (!PageUptodate(page)) {
813                 ret = ext4_read_inline_page(inode, page);
814                 if (ret < 0)
815                         goto out;
816         }
817
818         ret = __block_write_begin(page, 0, inline_size,
819                                   ext4_da_get_block_prep);
820         if (ret) {
821                 up_read(&EXT4_I(inode)->xattr_sem);
822                 unlock_page(page);
823                 put_page(page);
824                 ext4_truncate_failed_write(inode);
825                 return ret;
826         }
827
828         SetPageDirty(page);
829         SetPageUptodate(page);
830         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
831         *fsdata = (void *)CONVERT_INLINE_DATA;
832
833 out:
834         up_read(&EXT4_I(inode)->xattr_sem);
835         if (page) {
836                 unlock_page(page);
837                 put_page(page);
838         }
839         return ret;
840 }
841
842 /*
843  * Prepare the write for the inline data.
844  * If the the data can be written into the inode, we just read
845  * the page and make it uptodate, and start the journal.
846  * Otherwise read the page, makes it dirty so that it can be
847  * handle in writepages(the i_disksize update is left to the
848  * normal ext4_da_write_end).
849  */
850 int ext4_da_write_inline_data_begin(struct address_space *mapping,
851                                     struct inode *inode,
852                                     loff_t pos, unsigned len,
853                                     unsigned flags,
854                                     struct page **pagep,
855                                     void **fsdata)
856 {
857         int ret, inline_size;
858         handle_t *handle;
859         struct page *page;
860         struct ext4_iloc iloc;
861         int retries;
862
863         ret = ext4_get_inode_loc(inode, &iloc);
864         if (ret)
865                 return ret;
866
867 retry_journal:
868         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
869         if (IS_ERR(handle)) {
870                 ret = PTR_ERR(handle);
871                 goto out;
872         }
873
874         inline_size = ext4_get_max_inline_size(inode);
875
876         ret = -ENOSPC;
877         if (inline_size >= pos + len) {
878                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
879                 if (ret && ret != -ENOSPC)
880                         goto out_journal;
881         }
882
883         /*
884          * We cannot recurse into the filesystem as the transaction
885          * is already started.
886          */
887         flags |= AOP_FLAG_NOFS;
888
889         if (ret == -ENOSPC) {
890                 ext4_journal_stop(handle);
891                 ret = ext4_da_convert_inline_data_to_extent(mapping,
892                                                             inode,
893                                                             flags,
894                                                             fsdata);
895                 if (ret == -ENOSPC &&
896                     ext4_should_retry_alloc(inode->i_sb, &retries))
897                         goto retry_journal;
898                 goto out;
899         }
900
901
902         page = grab_cache_page_write_begin(mapping, 0, flags);
903         if (!page) {
904                 ret = -ENOMEM;
905                 goto out_journal;
906         }
907
908         down_read(&EXT4_I(inode)->xattr_sem);
909         if (!ext4_has_inline_data(inode)) {
910                 ret = 0;
911                 goto out_release_page;
912         }
913
914         if (!PageUptodate(page)) {
915                 ret = ext4_read_inline_page(inode, page);
916                 if (ret < 0)
917                         goto out_release_page;
918         }
919
920         up_read(&EXT4_I(inode)->xattr_sem);
921         *pagep = page;
922         brelse(iloc.bh);
923         return 1;
924 out_release_page:
925         up_read(&EXT4_I(inode)->xattr_sem);
926         unlock_page(page);
927         put_page(page);
928 out_journal:
929         ext4_journal_stop(handle);
930 out:
931         brelse(iloc.bh);
932         return ret;
933 }
934
935 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
936                                   unsigned len, unsigned copied,
937                                   struct page *page)
938 {
939         int i_size_changed = 0;
940         int ret;
941
942         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
943         if (ret < 0) {
944                 unlock_page(page);
945                 put_page(page);
946                 return ret;
947         }
948         copied = ret;
949
950         /*
951          * No need to use i_size_read() here, the i_size
952          * cannot change under us because we hold i_mutex.
953          *
954          * But it's important to update i_size while still holding page lock:
955          * page writeout could otherwise come in and zero beyond i_size.
956          */
957         if (pos+copied > inode->i_size) {
958                 i_size_write(inode, pos+copied);
959                 i_size_changed = 1;
960         }
961         unlock_page(page);
962         put_page(page);
963
964         /*
965          * Don't mark the inode dirty under page lock. First, it unnecessarily
966          * makes the holding time of page lock longer. Second, it forces lock
967          * ordering of page lock and transaction start for journaling
968          * filesystems.
969          */
970         if (i_size_changed)
971                 mark_inode_dirty(inode);
972
973         return copied;
974 }
975
976 #ifdef INLINE_DIR_DEBUG
977 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
978                           void *inline_start, int inline_size)
979 {
980         int offset;
981         unsigned short de_len;
982         struct ext4_dir_entry_2 *de = inline_start;
983         void *dlimit = inline_start + inline_size;
984
985         trace_printk("inode %lu\n", dir->i_ino);
986         offset = 0;
987         while ((void *)de < dlimit) {
988                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
989                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
990                              offset, de_len, de->name_len, de->name,
991                              de->name_len, le32_to_cpu(de->inode));
992                 if (ext4_check_dir_entry(dir, NULL, de, bh,
993                                          inline_start, inline_size, offset))
994                         BUG();
995
996                 offset += de_len;
997                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
998         }
999 }
1000 #else
1001 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1002 #endif
1003
1004 /*
1005  * Add a new entry into a inline dir.
1006  * It will return -ENOSPC if no space is available, and -EIO
1007  * and -EEXIST if directory entry already exists.
1008  */
1009 static int ext4_add_dirent_to_inline(handle_t *handle,
1010                                      struct ext4_filename *fname,
1011                                      struct inode *dir,
1012                                      struct inode *inode,
1013                                      struct ext4_iloc *iloc,
1014                                      void *inline_start, int inline_size)
1015 {
1016         int             err;
1017         struct ext4_dir_entry_2 *de;
1018
1019         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1020                                 inline_size, fname, &de);
1021         if (err)
1022                 return err;
1023
1024         BUFFER_TRACE(iloc->bh, "get_write_access");
1025         err = ext4_journal_get_write_access(handle, iloc->bh);
1026         if (err)
1027                 return err;
1028         ext4_insert_dentry(inode, de, inline_size, fname);
1029
1030         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1031
1032         /*
1033          * XXX shouldn't update any times until successful
1034          * completion of syscall, but too many callers depend
1035          * on this.
1036          *
1037          * XXX similarly, too many callers depend on
1038          * ext4_new_inode() setting the times, but error
1039          * recovery deletes the inode, so the worst that can
1040          * happen is that the times are slightly out of date
1041          * and/or different from the directory change time.
1042          */
1043         dir->i_mtime = dir->i_ctime = current_time(dir);
1044         ext4_update_dx_flag(dir);
1045         inode_inc_iversion(dir);
1046         return 1;
1047 }
1048
1049 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1050                                        struct ext4_iloc *iloc)
1051 {
1052         struct ext4_xattr_entry *entry;
1053         struct ext4_xattr_ibody_header *header;
1054
1055         BUG_ON(!EXT4_I(inode)->i_inline_off);
1056
1057         header = IHDR(inode, ext4_raw_inode(iloc));
1058         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1059                                             EXT4_I(inode)->i_inline_off);
1060
1061         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1062 }
1063
1064 /* Set the final de to cover the whole block. */
1065 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1066 {
1067         struct ext4_dir_entry_2 *de, *prev_de;
1068         void *limit;
1069         int de_len;
1070
1071         de = (struct ext4_dir_entry_2 *)de_buf;
1072         if (old_size) {
1073                 limit = de_buf + old_size;
1074                 do {
1075                         prev_de = de;
1076                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1077                         de_buf += de_len;
1078                         de = (struct ext4_dir_entry_2 *)de_buf;
1079                 } while (de_buf < limit);
1080
1081                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1082                                                         old_size, new_size);
1083         } else {
1084                 /* this is just created, so create an empty entry. */
1085                 de->inode = 0;
1086                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1087         }
1088 }
1089
1090 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1091                                   struct ext4_iloc *iloc)
1092 {
1093         int ret;
1094         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1095         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1096
1097         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1098                 return -ENOSPC;
1099
1100         ret = ext4_update_inline_data(handle, dir,
1101                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1102         if (ret)
1103                 return ret;
1104
1105         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1106                              EXT4_I(dir)->i_inline_size -
1107                                                 EXT4_MIN_INLINE_DATA_SIZE);
1108         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1109         return 0;
1110 }
1111
1112 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1113                                      struct ext4_iloc *iloc,
1114                                      void *buf, int inline_size)
1115 {
1116         ext4_create_inline_data(handle, inode, inline_size);
1117         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1118         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1119 }
1120
1121 static int ext4_finish_convert_inline_dir(handle_t *handle,
1122                                           struct inode *inode,
1123                                           struct buffer_head *dir_block,
1124                                           void *buf,
1125                                           int inline_size)
1126 {
1127         int err, csum_size = 0, header_size = 0;
1128         struct ext4_dir_entry_2 *de;
1129         struct ext4_dir_entry_tail *t;
1130         void *target = dir_block->b_data;
1131
1132         /*
1133          * First create "." and ".." and then copy the dir information
1134          * back to the block.
1135          */
1136         de = (struct ext4_dir_entry_2 *)target;
1137         de = ext4_init_dot_dotdot(inode, de,
1138                 inode->i_sb->s_blocksize, csum_size,
1139                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1140         header_size = (void *)de - target;
1141
1142         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1143                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1144
1145         if (ext4_has_metadata_csum(inode->i_sb))
1146                 csum_size = sizeof(struct ext4_dir_entry_tail);
1147
1148         inode->i_size = inode->i_sb->s_blocksize;
1149         i_size_write(inode, inode->i_sb->s_blocksize);
1150         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1151         ext4_update_final_de(dir_block->b_data,
1152                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1153                         inode->i_sb->s_blocksize - csum_size);
1154
1155         if (csum_size) {
1156                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1157                                      inode->i_sb->s_blocksize);
1158                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1159         }
1160         set_buffer_uptodate(dir_block);
1161         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1162         if (err)
1163                 return err;
1164         set_buffer_verified(dir_block);
1165         return ext4_mark_inode_dirty(handle, inode);
1166 }
1167
1168 static int ext4_convert_inline_data_nolock(handle_t *handle,
1169                                            struct inode *inode,
1170                                            struct ext4_iloc *iloc)
1171 {
1172         int error;
1173         void *buf = NULL;
1174         struct buffer_head *data_bh = NULL;
1175         struct ext4_map_blocks map;
1176         int inline_size;
1177
1178         inline_size = ext4_get_inline_size(inode);
1179         buf = kmalloc(inline_size, GFP_NOFS);
1180         if (!buf) {
1181                 error = -ENOMEM;
1182                 goto out;
1183         }
1184
1185         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1186         if (error < 0)
1187                 goto out;
1188
1189         /*
1190          * Make sure the inline directory entries pass checks before we try to
1191          * convert them, so that we avoid touching stuff that needs fsck.
1192          */
1193         if (S_ISDIR(inode->i_mode)) {
1194                 error = ext4_check_all_de(inode, iloc->bh,
1195                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1196                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1197                 if (error)
1198                         goto out;
1199         }
1200
1201         error = ext4_destroy_inline_data_nolock(handle, inode);
1202         if (error)
1203                 goto out;
1204
1205         map.m_lblk = 0;
1206         map.m_len = 1;
1207         map.m_flags = 0;
1208         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1209         if (error < 0)
1210                 goto out_restore;
1211         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1212                 error = -EIO;
1213                 goto out_restore;
1214         }
1215
1216         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1217         if (!data_bh) {
1218                 error = -ENOMEM;
1219                 goto out_restore;
1220         }
1221
1222         lock_buffer(data_bh);
1223         error = ext4_journal_get_create_access(handle, data_bh);
1224         if (error) {
1225                 unlock_buffer(data_bh);
1226                 error = -EIO;
1227                 goto out_restore;
1228         }
1229         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1230
1231         if (!S_ISDIR(inode->i_mode)) {
1232                 memcpy(data_bh->b_data, buf, inline_size);
1233                 set_buffer_uptodate(data_bh);
1234                 error = ext4_handle_dirty_metadata(handle,
1235                                                    inode, data_bh);
1236         } else {
1237                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1238                                                        buf, inline_size);
1239         }
1240
1241         unlock_buffer(data_bh);
1242 out_restore:
1243         if (error)
1244                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1245
1246 out:
1247         brelse(data_bh);
1248         kfree(buf);
1249         return error;
1250 }
1251
1252 /*
1253  * Try to add the new entry to the inline data.
1254  * If succeeds, return 0. If not, extended the inline dir and copied data to
1255  * the new created block.
1256  */
1257 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1258                               struct inode *dir, struct inode *inode)
1259 {
1260         int ret, inline_size, no_expand;
1261         void *inline_start;
1262         struct ext4_iloc iloc;
1263
1264         ret = ext4_get_inode_loc(dir, &iloc);
1265         if (ret)
1266                 return ret;
1267
1268         ext4_write_lock_xattr(dir, &no_expand);
1269         if (!ext4_has_inline_data(dir))
1270                 goto out;
1271
1272         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1273                                                  EXT4_INLINE_DOTDOT_SIZE;
1274         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1275
1276         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1277                                         inline_start, inline_size);
1278         if (ret != -ENOSPC)
1279                 goto out;
1280
1281         /* check whether it can be inserted to inline xattr space. */
1282         inline_size = EXT4_I(dir)->i_inline_size -
1283                         EXT4_MIN_INLINE_DATA_SIZE;
1284         if (!inline_size) {
1285                 /* Try to use the xattr space.*/
1286                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1287                 if (ret && ret != -ENOSPC)
1288                         goto out;
1289
1290                 inline_size = EXT4_I(dir)->i_inline_size -
1291                                 EXT4_MIN_INLINE_DATA_SIZE;
1292         }
1293
1294         if (inline_size) {
1295                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1296
1297                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1298                                                 inode, &iloc, inline_start,
1299                                                 inline_size);
1300
1301                 if (ret != -ENOSPC)
1302                         goto out;
1303         }
1304
1305         /*
1306          * The inline space is filled up, so create a new block for it.
1307          * As the extent tree will be created, we have to save the inline
1308          * dir first.
1309          */
1310         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1311
1312 out:
1313         ext4_write_unlock_xattr(dir, &no_expand);
1314         ext4_mark_inode_dirty(handle, dir);
1315         brelse(iloc.bh);
1316         return ret;
1317 }
1318
1319 /*
1320  * This function fills a red-black tree with information from an
1321  * inlined dir.  It returns the number directory entries loaded
1322  * into the tree.  If there is an error it is returned in err.
1323  */
1324 int htree_inlinedir_to_tree(struct file *dir_file,
1325                             struct inode *dir, ext4_lblk_t block,
1326                             struct dx_hash_info *hinfo,
1327                             __u32 start_hash, __u32 start_minor_hash,
1328                             int *has_inline_data)
1329 {
1330         int err = 0, count = 0;
1331         unsigned int parent_ino;
1332         int pos;
1333         struct ext4_dir_entry_2 *de;
1334         struct inode *inode = file_inode(dir_file);
1335         int ret, inline_size = 0;
1336         struct ext4_iloc iloc;
1337         void *dir_buf = NULL;
1338         struct ext4_dir_entry_2 fake;
1339         struct fscrypt_str tmp_str;
1340
1341         ret = ext4_get_inode_loc(inode, &iloc);
1342         if (ret)
1343                 return ret;
1344
1345         down_read(&EXT4_I(inode)->xattr_sem);
1346         if (!ext4_has_inline_data(inode)) {
1347                 up_read(&EXT4_I(inode)->xattr_sem);
1348                 *has_inline_data = 0;
1349                 goto out;
1350         }
1351
1352         inline_size = ext4_get_inline_size(inode);
1353         dir_buf = kmalloc(inline_size, GFP_NOFS);
1354         if (!dir_buf) {
1355                 ret = -ENOMEM;
1356                 up_read(&EXT4_I(inode)->xattr_sem);
1357                 goto out;
1358         }
1359
1360         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1361         up_read(&EXT4_I(inode)->xattr_sem);
1362         if (ret < 0)
1363                 goto out;
1364
1365         pos = 0;
1366         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1367         while (pos < inline_size) {
1368                 /*
1369                  * As inlined dir doesn't store any information about '.' and
1370                  * only the inode number of '..' is stored, we have to handle
1371                  * them differently.
1372                  */
1373                 if (pos == 0) {
1374                         fake.inode = cpu_to_le32(inode->i_ino);
1375                         fake.name_len = 1;
1376                         strcpy(fake.name, ".");
1377                         fake.rec_len = ext4_rec_len_to_disk(
1378                                                 EXT4_DIR_REC_LEN(fake.name_len),
1379                                                 inline_size);
1380                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1381                         de = &fake;
1382                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1383                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1384                         fake.inode = cpu_to_le32(parent_ino);
1385                         fake.name_len = 2;
1386                         strcpy(fake.name, "..");
1387                         fake.rec_len = ext4_rec_len_to_disk(
1388                                                 EXT4_DIR_REC_LEN(fake.name_len),
1389                                                 inline_size);
1390                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1391                         de = &fake;
1392                         pos = EXT4_INLINE_DOTDOT_SIZE;
1393                 } else {
1394                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1395                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1396                         if (ext4_check_dir_entry(inode, dir_file, de,
1397                                          iloc.bh, dir_buf,
1398                                          inline_size, pos)) {
1399                                 ret = count;
1400                                 goto out;
1401                         }
1402                 }
1403
1404                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1405                 if ((hinfo->hash < start_hash) ||
1406                     ((hinfo->hash == start_hash) &&
1407                      (hinfo->minor_hash < start_minor_hash)))
1408                         continue;
1409                 if (de->inode == 0)
1410                         continue;
1411                 tmp_str.name = de->name;
1412                 tmp_str.len = de->name_len;
1413                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1414                                               hinfo->minor_hash, de, &tmp_str);
1415                 if (err) {
1416                         count = err;
1417                         goto out;
1418                 }
1419                 count++;
1420         }
1421         ret = count;
1422 out:
1423         kfree(dir_buf);
1424         brelse(iloc.bh);
1425         return ret;
1426 }
1427
1428 /*
1429  * So this function is called when the volume is mkfsed with
1430  * dir_index disabled. In order to keep f_pos persistent
1431  * after we convert from an inlined dir to a blocked based,
1432  * we just pretend that we are a normal dir and return the
1433  * offset as if '.' and '..' really take place.
1434  *
1435  */
1436 int ext4_read_inline_dir(struct file *file,
1437                          struct dir_context *ctx,
1438                          int *has_inline_data)
1439 {
1440         unsigned int offset, parent_ino;
1441         int i;
1442         struct ext4_dir_entry_2 *de;
1443         struct super_block *sb;
1444         struct inode *inode = file_inode(file);
1445         int ret, inline_size = 0;
1446         struct ext4_iloc iloc;
1447         void *dir_buf = NULL;
1448         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1449
1450         ret = ext4_get_inode_loc(inode, &iloc);
1451         if (ret)
1452                 return ret;
1453
1454         down_read(&EXT4_I(inode)->xattr_sem);
1455         if (!ext4_has_inline_data(inode)) {
1456                 up_read(&EXT4_I(inode)->xattr_sem);
1457                 *has_inline_data = 0;
1458                 goto out;
1459         }
1460
1461         inline_size = ext4_get_inline_size(inode);
1462         dir_buf = kmalloc(inline_size, GFP_NOFS);
1463         if (!dir_buf) {
1464                 ret = -ENOMEM;
1465                 up_read(&EXT4_I(inode)->xattr_sem);
1466                 goto out;
1467         }
1468
1469         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1470         up_read(&EXT4_I(inode)->xattr_sem);
1471         if (ret < 0)
1472                 goto out;
1473
1474         ret = 0;
1475         sb = inode->i_sb;
1476         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1477         offset = ctx->pos;
1478
1479         /*
1480          * dotdot_offset and dotdot_size is the real offset and
1481          * size for ".." and "." if the dir is block based while
1482          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1483          * So we will use extra_offset and extra_size to indicate them
1484          * during the inline dir iteration.
1485          */
1486         dotdot_offset = EXT4_DIR_REC_LEN(1);
1487         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1488         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1489         extra_size = extra_offset + inline_size;
1490
1491         /*
1492          * If the version has changed since the last call to
1493          * readdir(2), then we might be pointing to an invalid
1494          * dirent right now.  Scan from the start of the inline
1495          * dir to make sure.
1496          */
1497         if (!inode_eq_iversion(inode, file->f_version)) {
1498                 for (i = 0; i < extra_size && i < offset;) {
1499                         /*
1500                          * "." is with offset 0 and
1501                          * ".." is dotdot_offset.
1502                          */
1503                         if (!i) {
1504                                 i = dotdot_offset;
1505                                 continue;
1506                         } else if (i == dotdot_offset) {
1507                                 i = dotdot_size;
1508                                 continue;
1509                         }
1510                         /* for other entry, the real offset in
1511                          * the buf has to be tuned accordingly.
1512                          */
1513                         de = (struct ext4_dir_entry_2 *)
1514                                 (dir_buf + i - extra_offset);
1515                         /* It's too expensive to do a full
1516                          * dirent test each time round this
1517                          * loop, but we do have to test at
1518                          * least that it is non-zero.  A
1519                          * failure will be detected in the
1520                          * dirent test below. */
1521                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1522                                 < EXT4_DIR_REC_LEN(1))
1523                                 break;
1524                         i += ext4_rec_len_from_disk(de->rec_len,
1525                                                     extra_size);
1526                 }
1527                 offset = i;
1528                 ctx->pos = offset;
1529                 file->f_version = inode_query_iversion(inode);
1530         }
1531
1532         while (ctx->pos < extra_size) {
1533                 if (ctx->pos == 0) {
1534                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1535                                 goto out;
1536                         ctx->pos = dotdot_offset;
1537                         continue;
1538                 }
1539
1540                 if (ctx->pos == dotdot_offset) {
1541                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1542                                 goto out;
1543                         ctx->pos = dotdot_size;
1544                         continue;
1545                 }
1546
1547                 de = (struct ext4_dir_entry_2 *)
1548                         (dir_buf + ctx->pos - extra_offset);
1549                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1550                                          extra_size, ctx->pos))
1551                         goto out;
1552                 if (le32_to_cpu(de->inode)) {
1553                         if (!dir_emit(ctx, de->name, de->name_len,
1554                                       le32_to_cpu(de->inode),
1555                                       get_dtype(sb, de->file_type)))
1556                                 goto out;
1557                 }
1558                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1559         }
1560 out:
1561         kfree(dir_buf);
1562         brelse(iloc.bh);
1563         return ret;
1564 }
1565
1566 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1567                                         struct ext4_dir_entry_2 **parent_de,
1568                                         int *retval)
1569 {
1570         struct ext4_iloc iloc;
1571
1572         *retval = ext4_get_inode_loc(inode, &iloc);
1573         if (*retval)
1574                 return NULL;
1575
1576         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1577
1578         return iloc.bh;
1579 }
1580
1581 /*
1582  * Try to create the inline data for the new dir.
1583  * If it succeeds, return 0, otherwise return the error.
1584  * In case of ENOSPC, the caller should create the normal disk layout dir.
1585  */
1586 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1587                                struct inode *inode)
1588 {
1589         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1590         struct ext4_iloc iloc;
1591         struct ext4_dir_entry_2 *de;
1592
1593         ret = ext4_get_inode_loc(inode, &iloc);
1594         if (ret)
1595                 return ret;
1596
1597         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1598         if (ret)
1599                 goto out;
1600
1601         /*
1602          * For inline dir, we only save the inode information for the ".."
1603          * and create a fake dentry to cover the left space.
1604          */
1605         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1606         de->inode = cpu_to_le32(parent->i_ino);
1607         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1608         de->inode = 0;
1609         de->rec_len = ext4_rec_len_to_disk(
1610                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1611                                 inline_size);
1612         set_nlink(inode, 2);
1613         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1614 out:
1615         brelse(iloc.bh);
1616         return ret;
1617 }
1618
1619 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1620                                         struct ext4_filename *fname,
1621                                         struct ext4_dir_entry_2 **res_dir,
1622                                         int *has_inline_data)
1623 {
1624         int ret;
1625         struct ext4_iloc iloc;
1626         void *inline_start;
1627         int inline_size;
1628
1629         if (ext4_get_inode_loc(dir, &iloc))
1630                 return NULL;
1631
1632         down_read(&EXT4_I(dir)->xattr_sem);
1633         if (!ext4_has_inline_data(dir)) {
1634                 *has_inline_data = 0;
1635                 goto out;
1636         }
1637
1638         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1639                                                 EXT4_INLINE_DOTDOT_SIZE;
1640         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1641         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1642                               dir, fname, 0, res_dir);
1643         if (ret == 1)
1644                 goto out_find;
1645         if (ret < 0)
1646                 goto out;
1647
1648         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1649                 goto out;
1650
1651         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1652         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1653
1654         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1655                               dir, fname, 0, res_dir);
1656         if (ret == 1)
1657                 goto out_find;
1658
1659 out:
1660         brelse(iloc.bh);
1661         iloc.bh = NULL;
1662 out_find:
1663         up_read(&EXT4_I(dir)->xattr_sem);
1664         return iloc.bh;
1665 }
1666
1667 int ext4_delete_inline_entry(handle_t *handle,
1668                              struct inode *dir,
1669                              struct ext4_dir_entry_2 *de_del,
1670                              struct buffer_head *bh,
1671                              int *has_inline_data)
1672 {
1673         int err, inline_size, no_expand;
1674         struct ext4_iloc iloc;
1675         void *inline_start;
1676
1677         err = ext4_get_inode_loc(dir, &iloc);
1678         if (err)
1679                 return err;
1680
1681         ext4_write_lock_xattr(dir, &no_expand);
1682         if (!ext4_has_inline_data(dir)) {
1683                 *has_inline_data = 0;
1684                 goto out;
1685         }
1686
1687         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1688                 EXT4_MIN_INLINE_DATA_SIZE) {
1689                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1690                                         EXT4_INLINE_DOTDOT_SIZE;
1691                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1692                                 EXT4_INLINE_DOTDOT_SIZE;
1693         } else {
1694                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1695                 inline_size = ext4_get_inline_size(dir) -
1696                                 EXT4_MIN_INLINE_DATA_SIZE;
1697         }
1698
1699         BUFFER_TRACE(bh, "get_write_access");
1700         err = ext4_journal_get_write_access(handle, bh);
1701         if (err)
1702                 goto out;
1703
1704         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1705                                         inline_start, inline_size, 0);
1706         if (err)
1707                 goto out;
1708
1709         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1710 out:
1711         ext4_write_unlock_xattr(dir, &no_expand);
1712         if (likely(err == 0))
1713                 err = ext4_mark_inode_dirty(handle, dir);
1714         brelse(iloc.bh);
1715         if (err != -ENOENT)
1716                 ext4_std_error(dir->i_sb, err);
1717         return err;
1718 }
1719
1720 /*
1721  * Get the inline dentry at offset.
1722  */
1723 static inline struct ext4_dir_entry_2 *
1724 ext4_get_inline_entry(struct inode *inode,
1725                       struct ext4_iloc *iloc,
1726                       unsigned int offset,
1727                       void **inline_start,
1728                       int *inline_size)
1729 {
1730         void *inline_pos;
1731
1732         BUG_ON(offset > ext4_get_inline_size(inode));
1733
1734         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1735                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1736                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1737         } else {
1738                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1739                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1740                 *inline_size = ext4_get_inline_size(inode) -
1741                                 EXT4_MIN_INLINE_DATA_SIZE;
1742         }
1743
1744         if (inline_start)
1745                 *inline_start = inline_pos;
1746         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1747 }
1748
1749 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1750 {
1751         int err, inline_size;
1752         struct ext4_iloc iloc;
1753         void *inline_pos;
1754         unsigned int offset;
1755         struct ext4_dir_entry_2 *de;
1756         bool ret = true;
1757
1758         err = ext4_get_inode_loc(dir, &iloc);
1759         if (err) {
1760                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1761                                  err, dir->i_ino);
1762                 return true;
1763         }
1764
1765         down_read(&EXT4_I(dir)->xattr_sem);
1766         if (!ext4_has_inline_data(dir)) {
1767                 *has_inline_data = 0;
1768                 goto out;
1769         }
1770
1771         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1772         if (!le32_to_cpu(de->inode)) {
1773                 ext4_warning(dir->i_sb,
1774                              "bad inline directory (dir #%lu) - no `..'",
1775                              dir->i_ino);
1776                 ret = true;
1777                 goto out;
1778         }
1779
1780         offset = EXT4_INLINE_DOTDOT_SIZE;
1781         while (offset < dir->i_size) {
1782                 de = ext4_get_inline_entry(dir, &iloc, offset,
1783                                            &inline_pos, &inline_size);
1784                 if (ext4_check_dir_entry(dir, NULL, de,
1785                                          iloc.bh, inline_pos,
1786                                          inline_size, offset)) {
1787                         ext4_warning(dir->i_sb,
1788                                      "bad inline directory (dir #%lu) - "
1789                                      "inode %u, rec_len %u, name_len %d"
1790                                      "inline size %d",
1791                                      dir->i_ino, le32_to_cpu(de->inode),
1792                                      le16_to_cpu(de->rec_len), de->name_len,
1793                                      inline_size);
1794                         ret = true;
1795                         goto out;
1796                 }
1797                 if (le32_to_cpu(de->inode)) {
1798                         ret = false;
1799                         goto out;
1800                 }
1801                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1802         }
1803
1804 out:
1805         up_read(&EXT4_I(dir)->xattr_sem);
1806         brelse(iloc.bh);
1807         return ret;
1808 }
1809
1810 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1811 {
1812         int ret, no_expand;
1813
1814         ext4_write_lock_xattr(inode, &no_expand);
1815         ret = ext4_destroy_inline_data_nolock(handle, inode);
1816         ext4_write_unlock_xattr(inode, &no_expand);
1817
1818         return ret;
1819 }
1820
1821 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1822 {
1823         __u64 addr;
1824         int error = -EAGAIN;
1825         struct ext4_iloc iloc;
1826
1827         down_read(&EXT4_I(inode)->xattr_sem);
1828         if (!ext4_has_inline_data(inode))
1829                 goto out;
1830
1831         error = ext4_get_inode_loc(inode, &iloc);
1832         if (error)
1833                 goto out;
1834
1835         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1836         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1837         addr += offsetof(struct ext4_inode, i_block);
1838
1839         brelse(iloc.bh);
1840
1841         iomap->addr = addr;
1842         iomap->offset = 0;
1843         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1844                               i_size_read(inode));
1845         iomap->type = IOMAP_INLINE;
1846         iomap->flags = 0;
1847
1848 out:
1849         up_read(&EXT4_I(inode)->xattr_sem);
1850         return error;
1851 }
1852
1853 int ext4_inline_data_fiemap(struct inode *inode,
1854                             struct fiemap_extent_info *fieinfo,
1855                             int *has_inline, __u64 start, __u64 len)
1856 {
1857         __u64 physical = 0;
1858         __u64 inline_len;
1859         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1860                 FIEMAP_EXTENT_LAST;
1861         int error = 0;
1862         struct ext4_iloc iloc;
1863
1864         down_read(&EXT4_I(inode)->xattr_sem);
1865         if (!ext4_has_inline_data(inode)) {
1866                 *has_inline = 0;
1867                 goto out;
1868         }
1869         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1870                            i_size_read(inode));
1871         if (start >= inline_len)
1872                 goto out;
1873         if (start + len < inline_len)
1874                 inline_len = start + len;
1875         inline_len -= start;
1876
1877         error = ext4_get_inode_loc(inode, &iloc);
1878         if (error)
1879                 goto out;
1880
1881         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1882         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1883         physical += offsetof(struct ext4_inode, i_block);
1884
1885         if (physical)
1886                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1887                                                 inline_len, flags);
1888         brelse(iloc.bh);
1889 out:
1890         up_read(&EXT4_I(inode)->xattr_sem);
1891         return (error < 0 ? error : 0);
1892 }
1893
1894 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1895 {
1896         handle_t *handle;
1897         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1898         size_t i_size;
1899         void *value = NULL;
1900         struct ext4_xattr_ibody_find is = {
1901                 .s = { .not_found = -ENODATA, },
1902         };
1903         struct ext4_xattr_info i = {
1904                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1905                 .name = EXT4_XATTR_SYSTEM_DATA,
1906         };
1907
1908
1909         needed_blocks = ext4_writepage_trans_blocks(inode);
1910         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1911         if (IS_ERR(handle))
1912                 return PTR_ERR(handle);
1913
1914         ext4_write_lock_xattr(inode, &no_expand);
1915         if (!ext4_has_inline_data(inode)) {
1916                 *has_inline = 0;
1917                 ext4_journal_stop(handle);
1918                 return 0;
1919         }
1920
1921         if ((err = ext4_orphan_add(handle, inode)) != 0)
1922                 goto out;
1923
1924         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1925                 goto out;
1926
1927         down_write(&EXT4_I(inode)->i_data_sem);
1928         i_size = inode->i_size;
1929         inline_size = ext4_get_inline_size(inode);
1930         EXT4_I(inode)->i_disksize = i_size;
1931
1932         if (i_size < inline_size) {
1933                 /* Clear the content in the xattr space. */
1934                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1935                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1936                                 goto out_error;
1937
1938                         BUG_ON(is.s.not_found);
1939
1940                         value_len = le32_to_cpu(is.s.here->e_value_size);
1941                         value = kmalloc(value_len, GFP_NOFS);
1942                         if (!value) {
1943                                 err = -ENOMEM;
1944                                 goto out_error;
1945                         }
1946
1947                         err = ext4_xattr_ibody_get(inode, i.name_index,
1948                                                    i.name, value, value_len);
1949                         if (err <= 0)
1950                                 goto out_error;
1951
1952                         i.value = value;
1953                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1954                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1955                         err = ext4_xattr_ibody_inline_set(handle, inode,
1956                                                           &i, &is);
1957                         if (err)
1958                                 goto out_error;
1959                 }
1960
1961                 /* Clear the content within i_blocks. */
1962                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1963                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1964                         memset(p + i_size, 0,
1965                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1966                 }
1967
1968                 EXT4_I(inode)->i_inline_size = i_size <
1969                                         EXT4_MIN_INLINE_DATA_SIZE ?
1970                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1971         }
1972
1973 out_error:
1974         up_write(&EXT4_I(inode)->i_data_sem);
1975 out:
1976         brelse(is.iloc.bh);
1977         ext4_write_unlock_xattr(inode, &no_expand);
1978         kfree(value);
1979         if (inode->i_nlink)
1980                 ext4_orphan_del(handle, inode);
1981
1982         if (err == 0) {
1983                 inode->i_mtime = inode->i_ctime = current_time(inode);
1984                 err = ext4_mark_inode_dirty(handle, inode);
1985                 if (IS_SYNC(inode))
1986                         ext4_handle_sync(handle);
1987         }
1988         ext4_journal_stop(handle);
1989         return err;
1990 }
1991
1992 int ext4_convert_inline_data(struct inode *inode)
1993 {
1994         int error, needed_blocks, no_expand;
1995         handle_t *handle;
1996         struct ext4_iloc iloc;
1997
1998         if (!ext4_has_inline_data(inode)) {
1999                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2000                 return 0;
2001         }
2002
2003         needed_blocks = ext4_writepage_trans_blocks(inode);
2004
2005         iloc.bh = NULL;
2006         error = ext4_get_inode_loc(inode, &iloc);
2007         if (error)
2008                 return error;
2009
2010         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2011         if (IS_ERR(handle)) {
2012                 error = PTR_ERR(handle);
2013                 goto out_free;
2014         }
2015
2016         ext4_write_lock_xattr(inode, &no_expand);
2017         if (ext4_has_inline_data(inode))
2018                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2019         ext4_write_unlock_xattr(inode, &no_expand);
2020         ext4_journal_stop(handle);
2021 out_free:
2022         brelse(iloc.bh);
2023         return error;
2024 }