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TOMOYO Linux Cross Reference
Linux/fs/ext4/inline.c

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  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         ret = ext4_journal_get_write_access(handle, iloc.bh);
686         if (ret)
687                 goto out;
688 
689         flags |= AOP_FLAG_NOFS;
690 
691         page = grab_cache_page_write_begin(mapping, 0, flags);
692         if (!page) {
693                 ret = -ENOMEM;
694                 goto out;
695         }
696 
697         *pagep = page;
698         down_read(&EXT4_I(inode)->xattr_sem);
699         if (!ext4_has_inline_data(inode)) {
700                 ret = 0;
701                 unlock_page(page);
702                 put_page(page);
703                 goto out_up_read;
704         }
705 
706         if (!PageUptodate(page)) {
707                 ret = ext4_read_inline_page(inode, page);
708                 if (ret < 0) {
709                         unlock_page(page);
710                         put_page(page);
711                         goto out_up_read;
712                 }
713         }
714 
715         ret = 1;
716         handle = NULL;
717 out_up_read:
718         up_read(&EXT4_I(inode)->xattr_sem);
719 out:
720         if (handle && (ret != 1))
721                 ext4_journal_stop(handle);
722         brelse(iloc.bh);
723         return ret;
724 convert:
725         return ext4_convert_inline_data_to_extent(mapping,
726                                                   inode, flags);
727 }
728 
729 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
730                                unsigned copied, struct page *page)
731 {
732         int ret, no_expand;
733         void *kaddr;
734         struct ext4_iloc iloc;
735 
736         if (unlikely(copied < len)) {
737                 if (!PageUptodate(page)) {
738                         copied = 0;
739                         goto out;
740                 }
741         }
742 
743         ret = ext4_get_inode_loc(inode, &iloc);
744         if (ret) {
745                 ext4_std_error(inode->i_sb, ret);
746                 copied = 0;
747                 goto out;
748         }
749 
750         ext4_write_lock_xattr(inode, &no_expand);
751         BUG_ON(!ext4_has_inline_data(inode));
752 
753         kaddr = kmap_atomic(page);
754         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
755         kunmap_atomic(kaddr);
756         SetPageUptodate(page);
757         /* clear page dirty so that writepages wouldn't work for us. */
758         ClearPageDirty(page);
759 
760         ext4_write_unlock_xattr(inode, &no_expand);
761         brelse(iloc.bh);
762         mark_inode_dirty(inode);
763 out:
764         return copied;
765 }
766 
767 struct buffer_head *
768 ext4_journalled_write_inline_data(struct inode *inode,
769                                   unsigned len,
770                                   struct page *page)
771 {
772         int ret, no_expand;
773         void *kaddr;
774         struct ext4_iloc iloc;
775 
776         ret = ext4_get_inode_loc(inode, &iloc);
777         if (ret) {
778                 ext4_std_error(inode->i_sb, ret);
779                 return NULL;
780         }
781 
782         ext4_write_lock_xattr(inode, &no_expand);
783         kaddr = kmap_atomic(page);
784         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
785         kunmap_atomic(kaddr);
786         ext4_write_unlock_xattr(inode, &no_expand);
787 
788         return iloc.bh;
789 }
790 
791 /*
792  * Try to make the page cache and handle ready for the inline data case.
793  * We can call this function in 2 cases:
794  * 1. The inode is created and the first write exceeds inline size. We can
795  *    clear the inode state safely.
796  * 2. The inode has inline data, then we need to read the data, make it
797  *    update and dirty so that ext4_da_writepages can handle it. We don't
798  *    need to start the journal since the file's metatdata isn't changed now.
799  */
800 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
801                                                  struct inode *inode,
802                                                  unsigned flags,
803                                                  void **fsdata)
804 {
805         int ret = 0, inline_size;
806         struct page *page;
807 
808         page = grab_cache_page_write_begin(mapping, 0, flags);
809         if (!page)
810                 return -ENOMEM;
811 
812         down_read(&EXT4_I(inode)->xattr_sem);
813         if (!ext4_has_inline_data(inode)) {
814                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
815                 goto out;
816         }
817 
818         inline_size = ext4_get_inline_size(inode);
819 
820         if (!PageUptodate(page)) {
821                 ret = ext4_read_inline_page(inode, page);
822                 if (ret < 0)
823                         goto out;
824         }
825 
826         ret = __block_write_begin(page, 0, inline_size,
827                                   ext4_da_get_block_prep);
828         if (ret) {
829                 up_read(&EXT4_I(inode)->xattr_sem);
830                 unlock_page(page);
831                 put_page(page);
832                 ext4_truncate_failed_write(inode);
833                 return ret;
834         }
835 
836         SetPageDirty(page);
837         SetPageUptodate(page);
838         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
839         *fsdata = (void *)CONVERT_INLINE_DATA;
840 
841 out:
842         up_read(&EXT4_I(inode)->xattr_sem);
843         if (page) {
844                 unlock_page(page);
845                 put_page(page);
846         }
847         return ret;
848 }
849 
850 /*
851  * Prepare the write for the inline data.
852  * If the the data can be written into the inode, we just read
853  * the page and make it uptodate, and start the journal.
854  * Otherwise read the page, makes it dirty so that it can be
855  * handle in writepages(the i_disksize update is left to the
856  * normal ext4_da_write_end).
857  */
858 int ext4_da_write_inline_data_begin(struct address_space *mapping,
859                                     struct inode *inode,
860                                     loff_t pos, unsigned len,
861                                     unsigned flags,
862                                     struct page **pagep,
863                                     void **fsdata)
864 {
865         int ret, inline_size;
866         handle_t *handle;
867         struct page *page;
868         struct ext4_iloc iloc;
869         int retries = 0;
870 
871         ret = ext4_get_inode_loc(inode, &iloc);
872         if (ret)
873                 return ret;
874 
875 retry_journal:
876         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
877         if (IS_ERR(handle)) {
878                 ret = PTR_ERR(handle);
879                 goto out;
880         }
881 
882         inline_size = ext4_get_max_inline_size(inode);
883 
884         ret = -ENOSPC;
885         if (inline_size >= pos + len) {
886                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
887                 if (ret && ret != -ENOSPC)
888                         goto out_journal;
889         }
890 
891         /*
892          * We cannot recurse into the filesystem as the transaction
893          * is already started.
894          */
895         flags |= AOP_FLAG_NOFS;
896 
897         if (ret == -ENOSPC) {
898                 ext4_journal_stop(handle);
899                 ret = ext4_da_convert_inline_data_to_extent(mapping,
900                                                             inode,
901                                                             flags,
902                                                             fsdata);
903                 if (ret == -ENOSPC &&
904                     ext4_should_retry_alloc(inode->i_sb, &retries))
905                         goto retry_journal;
906                 goto out;
907         }
908 
909         page = grab_cache_page_write_begin(mapping, 0, flags);
910         if (!page) {
911                 ret = -ENOMEM;
912                 goto out_journal;
913         }
914 
915         down_read(&EXT4_I(inode)->xattr_sem);
916         if (!ext4_has_inline_data(inode)) {
917                 ret = 0;
918                 goto out_release_page;
919         }
920 
921         if (!PageUptodate(page)) {
922                 ret = ext4_read_inline_page(inode, page);
923                 if (ret < 0)
924                         goto out_release_page;
925         }
926         ret = ext4_journal_get_write_access(handle, iloc.bh);
927         if (ret)
928                 goto out_release_page;
929 
930         up_read(&EXT4_I(inode)->xattr_sem);
931         *pagep = page;
932         brelse(iloc.bh);
933         return 1;
934 out_release_page:
935         up_read(&EXT4_I(inode)->xattr_sem);
936         unlock_page(page);
937         put_page(page);
938 out_journal:
939         ext4_journal_stop(handle);
940 out:
941         brelse(iloc.bh);
942         return ret;
943 }
944 
945 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
946                                   unsigned len, unsigned copied,
947                                   struct page *page)
948 {
949         int ret;
950 
951         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
952         if (ret < 0) {
953                 unlock_page(page);
954                 put_page(page);
955                 return ret;
956         }
957         copied = ret;
958 
959         /*
960          * No need to use i_size_read() here, the i_size
961          * cannot change under us because we hold i_mutex.
962          *
963          * But it's important to update i_size while still holding page lock:
964          * page writeout could otherwise come in and zero beyond i_size.
965          */
966         if (pos+copied > inode->i_size)
967                 i_size_write(inode, pos+copied);
968         unlock_page(page);
969         put_page(page);
970 
971         /*
972          * Don't mark the inode dirty under page lock. First, it unnecessarily
973          * makes the holding time of page lock longer. Second, it forces lock
974          * ordering of page lock and transaction start for journaling
975          * filesystems.
976          */
977         mark_inode_dirty(inode);
978 
979         return copied;
980 }
981 
982 #ifdef INLINE_DIR_DEBUG
983 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
984                           void *inline_start, int inline_size)
985 {
986         int offset;
987         unsigned short de_len;
988         struct ext4_dir_entry_2 *de = inline_start;
989         void *dlimit = inline_start + inline_size;
990 
991         trace_printk("inode %lu\n", dir->i_ino);
992         offset = 0;
993         while ((void *)de < dlimit) {
994                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
995                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
996                              offset, de_len, de->name_len, de->name,
997                              de->name_len, le32_to_cpu(de->inode));
998                 if (ext4_check_dir_entry(dir, NULL, de, bh,
999                                          inline_start, inline_size, offset))
1000                         BUG();
1001 
1002                 offset += de_len;
1003                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1004         }
1005 }
1006 #else
1007 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1008 #endif
1009 
1010 /*
1011  * Add a new entry into a inline dir.
1012  * It will return -ENOSPC if no space is available, and -EIO
1013  * and -EEXIST if directory entry already exists.
1014  */
1015 static int ext4_add_dirent_to_inline(handle_t *handle,
1016                                      struct ext4_filename *fname,
1017                                      struct inode *dir,
1018                                      struct inode *inode,
1019                                      struct ext4_iloc *iloc,
1020                                      void *inline_start, int inline_size)
1021 {
1022         int             err;
1023         struct ext4_dir_entry_2 *de;
1024 
1025         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1026                                 inline_size, fname, &de);
1027         if (err)
1028                 return err;
1029 
1030         BUFFER_TRACE(iloc->bh, "get_write_access");
1031         err = ext4_journal_get_write_access(handle, iloc->bh);
1032         if (err)
1033                 return err;
1034         ext4_insert_dentry(inode, de, inline_size, fname);
1035 
1036         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1037 
1038         /*
1039          * XXX shouldn't update any times until successful
1040          * completion of syscall, but too many callers depend
1041          * on this.
1042          *
1043          * XXX similarly, too many callers depend on
1044          * ext4_new_inode() setting the times, but error
1045          * recovery deletes the inode, so the worst that can
1046          * happen is that the times are slightly out of date
1047          * and/or different from the directory change time.
1048          */
1049         dir->i_mtime = dir->i_ctime = current_time(dir);
1050         ext4_update_dx_flag(dir);
1051         inode_inc_iversion(dir);
1052         return 1;
1053 }
1054 
1055 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1056                                        struct ext4_iloc *iloc)
1057 {
1058         struct ext4_xattr_entry *entry;
1059         struct ext4_xattr_ibody_header *header;
1060 
1061         BUG_ON(!EXT4_I(inode)->i_inline_off);
1062 
1063         header = IHDR(inode, ext4_raw_inode(iloc));
1064         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1065                                             EXT4_I(inode)->i_inline_off);
1066 
1067         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1068 }
1069 
1070 /* Set the final de to cover the whole block. */
1071 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1072 {
1073         struct ext4_dir_entry_2 *de, *prev_de;
1074         void *limit;
1075         int de_len;
1076 
1077         de = (struct ext4_dir_entry_2 *)de_buf;
1078         if (old_size) {
1079                 limit = de_buf + old_size;
1080                 do {
1081                         prev_de = de;
1082                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1083                         de_buf += de_len;
1084                         de = (struct ext4_dir_entry_2 *)de_buf;
1085                 } while (de_buf < limit);
1086 
1087                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1088                                                         old_size, new_size);
1089         } else {
1090                 /* this is just created, so create an empty entry. */
1091                 de->inode = 0;
1092                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1093         }
1094 }
1095 
1096 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1097                                   struct ext4_iloc *iloc)
1098 {
1099         int ret;
1100         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1101         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1102 
1103         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1104                 return -ENOSPC;
1105 
1106         ret = ext4_update_inline_data(handle, dir,
1107                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1108         if (ret)
1109                 return ret;
1110 
1111         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1112                              EXT4_I(dir)->i_inline_size -
1113                                                 EXT4_MIN_INLINE_DATA_SIZE);
1114         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1115         return 0;
1116 }
1117 
1118 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1119                                      struct ext4_iloc *iloc,
1120                                      void *buf, int inline_size)
1121 {
1122         ext4_create_inline_data(handle, inode, inline_size);
1123         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1124         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1125 }
1126 
1127 static int ext4_finish_convert_inline_dir(handle_t *handle,
1128                                           struct inode *inode,
1129                                           struct buffer_head *dir_block,
1130                                           void *buf,
1131                                           int inline_size)
1132 {
1133         int err, csum_size = 0, header_size = 0;
1134         struct ext4_dir_entry_2 *de;
1135         void *target = dir_block->b_data;
1136 
1137         /*
1138          * First create "." and ".." and then copy the dir information
1139          * back to the block.
1140          */
1141         de = (struct ext4_dir_entry_2 *)target;
1142         de = ext4_init_dot_dotdot(inode, de,
1143                 inode->i_sb->s_blocksize, csum_size,
1144                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1145         header_size = (void *)de - target;
1146 
1147         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1148                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1149 
1150         if (ext4_has_metadata_csum(inode->i_sb))
1151                 csum_size = sizeof(struct ext4_dir_entry_tail);
1152 
1153         inode->i_size = inode->i_sb->s_blocksize;
1154         i_size_write(inode, inode->i_sb->s_blocksize);
1155         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1156         ext4_update_final_de(dir_block->b_data,
1157                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1158                         inode->i_sb->s_blocksize - csum_size);
1159 
1160         if (csum_size)
1161                 ext4_initialize_dirent_tail(dir_block,
1162                                             inode->i_sb->s_blocksize);
1163         set_buffer_uptodate(dir_block);
1164         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1165         if (err)
1166                 return err;
1167         set_buffer_verified(dir_block);
1168         return ext4_mark_inode_dirty(handle, inode);
1169 }
1170 
1171 static int ext4_convert_inline_data_nolock(handle_t *handle,
1172                                            struct inode *inode,
1173                                            struct ext4_iloc *iloc)
1174 {
1175         int error;
1176         void *buf = NULL;
1177         struct buffer_head *data_bh = NULL;
1178         struct ext4_map_blocks map;
1179         int inline_size;
1180 
1181         inline_size = ext4_get_inline_size(inode);
1182         buf = kmalloc(inline_size, GFP_NOFS);
1183         if (!buf) {
1184                 error = -ENOMEM;
1185                 goto out;
1186         }
1187 
1188         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1189         if (error < 0)
1190                 goto out;
1191 
1192         /*
1193          * Make sure the inline directory entries pass checks before we try to
1194          * convert them, so that we avoid touching stuff that needs fsck.
1195          */
1196         if (S_ISDIR(inode->i_mode)) {
1197                 error = ext4_check_all_de(inode, iloc->bh,
1198                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1199                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1200                 if (error)
1201                         goto out;
1202         }
1203 
1204         error = ext4_destroy_inline_data_nolock(handle, inode);
1205         if (error)
1206                 goto out;
1207 
1208         map.m_lblk = 0;
1209         map.m_len = 1;
1210         map.m_flags = 0;
1211         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1212         if (error < 0)
1213                 goto out_restore;
1214         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1215                 error = -EIO;
1216                 goto out_restore;
1217         }
1218 
1219         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1220         if (!data_bh) {
1221                 error = -ENOMEM;
1222                 goto out_restore;
1223         }
1224 
1225         lock_buffer(data_bh);
1226         error = ext4_journal_get_create_access(handle, data_bh);
1227         if (error) {
1228                 unlock_buffer(data_bh);
1229                 error = -EIO;
1230                 goto out_restore;
1231         }
1232         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1233 
1234         if (!S_ISDIR(inode->i_mode)) {
1235                 memcpy(data_bh->b_data, buf, inline_size);
1236                 set_buffer_uptodate(data_bh);
1237                 error = ext4_handle_dirty_metadata(handle,
1238                                                    inode, data_bh);
1239         } else {
1240                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1241                                                        buf, inline_size);
1242         }
1243 
1244         unlock_buffer(data_bh);
1245 out_restore:
1246         if (error)
1247                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1248 
1249 out:
1250         brelse(data_bh);
1251         kfree(buf);
1252         return error;
1253 }
1254 
1255 /*
1256  * Try to add the new entry to the inline data.
1257  * If succeeds, return 0. If not, extended the inline dir and copied data to
1258  * the new created block.
1259  */
1260 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1261                               struct inode *dir, struct inode *inode)
1262 {
1263         int ret, inline_size, no_expand;
1264         void *inline_start;
1265         struct ext4_iloc iloc;
1266 
1267         ret = ext4_get_inode_loc(dir, &iloc);
1268         if (ret)
1269                 return ret;
1270 
1271         ext4_write_lock_xattr(dir, &no_expand);
1272         if (!ext4_has_inline_data(dir))
1273                 goto out;
1274 
1275         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1276                                                  EXT4_INLINE_DOTDOT_SIZE;
1277         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1278 
1279         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1280                                         inline_start, inline_size);
1281         if (ret != -ENOSPC)
1282                 goto out;
1283 
1284         /* check whether it can be inserted to inline xattr space. */
1285         inline_size = EXT4_I(dir)->i_inline_size -
1286                         EXT4_MIN_INLINE_DATA_SIZE;
1287         if (!inline_size) {
1288                 /* Try to use the xattr space.*/
1289                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1290                 if (ret && ret != -ENOSPC)
1291                         goto out;
1292 
1293                 inline_size = EXT4_I(dir)->i_inline_size -
1294                                 EXT4_MIN_INLINE_DATA_SIZE;
1295         }
1296 
1297         if (inline_size) {
1298                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1299 
1300                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1301                                                 inode, &iloc, inline_start,
1302                                                 inline_size);
1303 
1304                 if (ret != -ENOSPC)
1305                         goto out;
1306         }
1307 
1308         /*
1309          * The inline space is filled up, so create a new block for it.
1310          * As the extent tree will be created, we have to save the inline
1311          * dir first.
1312          */
1313         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1314 
1315 out:
1316         ext4_write_unlock_xattr(dir, &no_expand);
1317         ext4_mark_inode_dirty(handle, dir);
1318         brelse(iloc.bh);
1319         return ret;
1320 }
1321 
1322 /*
1323  * This function fills a red-black tree with information from an
1324  * inlined dir.  It returns the number directory entries loaded
1325  * into the tree.  If there is an error it is returned in err.
1326  */
1327 int ext4_inlinedir_to_tree(struct file *dir_file,
1328                            struct inode *dir, ext4_lblk_t block,
1329                            struct dx_hash_info *hinfo,
1330                            __u32 start_hash, __u32 start_minor_hash,
1331                            int *has_inline_data)
1332 {
1333         int err = 0, count = 0;
1334         unsigned int parent_ino;
1335         int pos;
1336         struct ext4_dir_entry_2 *de;
1337         struct inode *inode = file_inode(dir_file);
1338         int ret, inline_size = 0;
1339         struct ext4_iloc iloc;
1340         void *dir_buf = NULL;
1341         struct ext4_dir_entry_2 fake;
1342         struct fscrypt_str tmp_str;
1343 
1344         ret = ext4_get_inode_loc(inode, &iloc);
1345         if (ret)
1346                 return ret;
1347 
1348         down_read(&EXT4_I(inode)->xattr_sem);
1349         if (!ext4_has_inline_data(inode)) {
1350                 up_read(&EXT4_I(inode)->xattr_sem);
1351                 *has_inline_data = 0;
1352                 goto out;
1353         }
1354 
1355         inline_size = ext4_get_inline_size(inode);
1356         dir_buf = kmalloc(inline_size, GFP_NOFS);
1357         if (!dir_buf) {
1358                 ret = -ENOMEM;
1359                 up_read(&EXT4_I(inode)->xattr_sem);
1360                 goto out;
1361         }
1362 
1363         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1364         up_read(&EXT4_I(inode)->xattr_sem);
1365         if (ret < 0)
1366                 goto out;
1367 
1368         pos = 0;
1369         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1370         while (pos < inline_size) {
1371                 /*
1372                  * As inlined dir doesn't store any information about '.' and
1373                  * only the inode number of '..' is stored, we have to handle
1374                  * them differently.
1375                  */
1376                 if (pos == 0) {
1377                         fake.inode = cpu_to_le32(inode->i_ino);
1378                         fake.name_len = 1;
1379                         strcpy(fake.name, ".");
1380                         fake.rec_len = ext4_rec_len_to_disk(
1381                                                 EXT4_DIR_REC_LEN(fake.name_len),
1382                                                 inline_size);
1383                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1384                         de = &fake;
1385                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1386                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1387                         fake.inode = cpu_to_le32(parent_ino);
1388                         fake.name_len = 2;
1389                         strcpy(fake.name, "..");
1390                         fake.rec_len = ext4_rec_len_to_disk(
1391                                                 EXT4_DIR_REC_LEN(fake.name_len),
1392                                                 inline_size);
1393                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1394                         de = &fake;
1395                         pos = EXT4_INLINE_DOTDOT_SIZE;
1396                 } else {
1397                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1398                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1399                         if (ext4_check_dir_entry(inode, dir_file, de,
1400                                          iloc.bh, dir_buf,
1401                                          inline_size, pos)) {
1402                                 ret = count;
1403                                 goto out;
1404                         }
1405                 }
1406 
1407                 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1408                 if ((hinfo->hash < start_hash) ||
1409                     ((hinfo->hash == start_hash) &&
1410                      (hinfo->minor_hash < start_minor_hash)))
1411                         continue;
1412                 if (de->inode == 0)
1413                         continue;
1414                 tmp_str.name = de->name;
1415                 tmp_str.len = de->name_len;
1416                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1417                                               hinfo->minor_hash, de, &tmp_str);
1418                 if (err) {
1419                         count = err;
1420                         goto out;
1421                 }
1422                 count++;
1423         }
1424         ret = count;
1425 out:
1426         kfree(dir_buf);
1427         brelse(iloc.bh);
1428         return ret;
1429 }
1430 
1431 /*
1432  * So this function is called when the volume is mkfsed with
1433  * dir_index disabled. In order to keep f_pos persistent
1434  * after we convert from an inlined dir to a blocked based,
1435  * we just pretend that we are a normal dir and return the
1436  * offset as if '.' and '..' really take place.
1437  *
1438  */
1439 int ext4_read_inline_dir(struct file *file,
1440                          struct dir_context *ctx,
1441                          int *has_inline_data)
1442 {
1443         unsigned int offset, parent_ino;
1444         int i;
1445         struct ext4_dir_entry_2 *de;
1446         struct super_block *sb;
1447         struct inode *inode = file_inode(file);
1448         int ret, inline_size = 0;
1449         struct ext4_iloc iloc;
1450         void *dir_buf = NULL;
1451         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1452 
1453         ret = ext4_get_inode_loc(inode, &iloc);
1454         if (ret)
1455                 return ret;
1456 
1457         down_read(&EXT4_I(inode)->xattr_sem);
1458         if (!ext4_has_inline_data(inode)) {
1459                 up_read(&EXT4_I(inode)->xattr_sem);
1460                 *has_inline_data = 0;
1461                 goto out;
1462         }
1463 
1464         inline_size = ext4_get_inline_size(inode);
1465         dir_buf = kmalloc(inline_size, GFP_NOFS);
1466         if (!dir_buf) {
1467                 ret = -ENOMEM;
1468                 up_read(&EXT4_I(inode)->xattr_sem);
1469                 goto out;
1470         }
1471 
1472         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1473         up_read(&EXT4_I(inode)->xattr_sem);
1474         if (ret < 0)
1475                 goto out;
1476 
1477         ret = 0;
1478         sb = inode->i_sb;
1479         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1480         offset = ctx->pos;
1481 
1482         /*
1483          * dotdot_offset and dotdot_size is the real offset and
1484          * size for ".." and "." if the dir is block based while
1485          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1486          * So we will use extra_offset and extra_size to indicate them
1487          * during the inline dir iteration.
1488          */
1489         dotdot_offset = EXT4_DIR_REC_LEN(1);
1490         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1491         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1492         extra_size = extra_offset + inline_size;
1493 
1494         /*
1495          * If the version has changed since the last call to
1496          * readdir(2), then we might be pointing to an invalid
1497          * dirent right now.  Scan from the start of the inline
1498          * dir to make sure.
1499          */
1500         if (!inode_eq_iversion(inode, file->f_version)) {
1501                 for (i = 0; i < extra_size && i < offset;) {
1502                         /*
1503                          * "." is with offset 0 and
1504                          * ".." is dotdot_offset.
1505                          */
1506                         if (!i) {
1507                                 i = dotdot_offset;
1508                                 continue;
1509                         } else if (i == dotdot_offset) {
1510                                 i = dotdot_size;
1511                                 continue;
1512                         }
1513                         /* for other entry, the real offset in
1514                          * the buf has to be tuned accordingly.
1515                          */
1516                         de = (struct ext4_dir_entry_2 *)
1517                                 (dir_buf + i - extra_offset);
1518                         /* It's too expensive to do a full
1519                          * dirent test each time round this
1520                          * loop, but we do have to test at
1521                          * least that it is non-zero.  A
1522                          * failure will be detected in the
1523                          * dirent test below. */
1524                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1525                                 < EXT4_DIR_REC_LEN(1))
1526                                 break;
1527                         i += ext4_rec_len_from_disk(de->rec_len,
1528                                                     extra_size);
1529                 }
1530                 offset = i;
1531                 ctx->pos = offset;
1532                 file->f_version = inode_query_iversion(inode);
1533         }
1534 
1535         while (ctx->pos < extra_size) {
1536                 if (ctx->pos == 0) {
1537                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1538                                 goto out;
1539                         ctx->pos = dotdot_offset;
1540                         continue;
1541                 }
1542 
1543                 if (ctx->pos == dotdot_offset) {
1544                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1545                                 goto out;
1546                         ctx->pos = dotdot_size;
1547                         continue;
1548                 }
1549 
1550                 de = (struct ext4_dir_entry_2 *)
1551                         (dir_buf + ctx->pos - extra_offset);
1552                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1553                                          extra_size, ctx->pos))
1554                         goto out;
1555                 if (le32_to_cpu(de->inode)) {
1556                         if (!dir_emit(ctx, de->name, de->name_len,
1557                                       le32_to_cpu(de->inode),
1558                                       get_dtype(sb, de->file_type)))
1559                                 goto out;
1560                 }
1561                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1562         }
1563 out:
1564         kfree(dir_buf);
1565         brelse(iloc.bh);
1566         return ret;
1567 }
1568 
1569 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1570                                         struct ext4_dir_entry_2 **parent_de,
1571                                         int *retval)
1572 {
1573         struct ext4_iloc iloc;
1574 
1575         *retval = ext4_get_inode_loc(inode, &iloc);
1576         if (*retval)
1577                 return NULL;
1578 
1579         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1580 
1581         return iloc.bh;
1582 }
1583 
1584 /*
1585  * Try to create the inline data for the new dir.
1586  * If it succeeds, return 0, otherwise return the error.
1587  * In case of ENOSPC, the caller should create the normal disk layout dir.
1588  */
1589 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1590                                struct inode *inode)
1591 {
1592         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1593         struct ext4_iloc iloc;
1594         struct ext4_dir_entry_2 *de;
1595 
1596         ret = ext4_get_inode_loc(inode, &iloc);
1597         if (ret)
1598                 return ret;
1599 
1600         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1601         if (ret)
1602                 goto out;
1603 
1604         /*
1605          * For inline dir, we only save the inode information for the ".."
1606          * and create a fake dentry to cover the left space.
1607          */
1608         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1609         de->inode = cpu_to_le32(parent->i_ino);
1610         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1611         de->inode = 0;
1612         de->rec_len = ext4_rec_len_to_disk(
1613                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1614                                 inline_size);
1615         set_nlink(inode, 2);
1616         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1617 out:
1618         brelse(iloc.bh);
1619         return ret;
1620 }
1621 
1622 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1623                                         struct ext4_filename *fname,
1624                                         struct ext4_dir_entry_2 **res_dir,
1625                                         int *has_inline_data)
1626 {
1627         int ret;
1628         struct ext4_iloc iloc;
1629         void *inline_start;
1630         int inline_size;
1631 
1632         if (ext4_get_inode_loc(dir, &iloc))
1633                 return NULL;
1634 
1635         down_read(&EXT4_I(dir)->xattr_sem);
1636         if (!ext4_has_inline_data(dir)) {
1637                 *has_inline_data = 0;
1638                 goto out;
1639         }
1640 
1641         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1642                                                 EXT4_INLINE_DOTDOT_SIZE;
1643         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1644         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1645                               dir, fname, 0, res_dir);
1646         if (ret == 1)
1647                 goto out_find;
1648         if (ret < 0)
1649                 goto out;
1650 
1651         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1652                 goto out;
1653 
1654         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1655         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1656 
1657         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1658                               dir, fname, 0, res_dir);
1659         if (ret == 1)
1660                 goto out_find;
1661 
1662 out:
1663         brelse(iloc.bh);
1664         iloc.bh = NULL;
1665 out_find:
1666         up_read(&EXT4_I(dir)->xattr_sem);
1667         return iloc.bh;
1668 }
1669 
1670 int ext4_delete_inline_entry(handle_t *handle,
1671                              struct inode *dir,
1672                              struct ext4_dir_entry_2 *de_del,
1673                              struct buffer_head *bh,
1674                              int *has_inline_data)
1675 {
1676         int err, inline_size, no_expand;
1677         struct ext4_iloc iloc;
1678         void *inline_start;
1679 
1680         err = ext4_get_inode_loc(dir, &iloc);
1681         if (err)
1682                 return err;
1683 
1684         ext4_write_lock_xattr(dir, &no_expand);
1685         if (!ext4_has_inline_data(dir)) {
1686                 *has_inline_data = 0;
1687                 goto out;
1688         }
1689 
1690         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1691                 EXT4_MIN_INLINE_DATA_SIZE) {
1692                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1693                                         EXT4_INLINE_DOTDOT_SIZE;
1694                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1695                                 EXT4_INLINE_DOTDOT_SIZE;
1696         } else {
1697                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1698                 inline_size = ext4_get_inline_size(dir) -
1699                                 EXT4_MIN_INLINE_DATA_SIZE;
1700         }
1701 
1702         BUFFER_TRACE(bh, "get_write_access");
1703         err = ext4_journal_get_write_access(handle, bh);
1704         if (err)
1705                 goto out;
1706 
1707         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1708                                         inline_start, inline_size, 0);
1709         if (err)
1710                 goto out;
1711 
1712         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1713 out:
1714         ext4_write_unlock_xattr(dir, &no_expand);
1715         if (likely(err == 0))
1716                 err = ext4_mark_inode_dirty(handle, dir);
1717         brelse(iloc.bh);
1718         if (err != -ENOENT)
1719                 ext4_std_error(dir->i_sb, err);
1720         return err;
1721 }
1722 
1723 /*
1724  * Get the inline dentry at offset.
1725  */
1726 static inline struct ext4_dir_entry_2 *
1727 ext4_get_inline_entry(struct inode *inode,
1728                       struct ext4_iloc *iloc,
1729                       unsigned int offset,
1730                       void **inline_start,
1731                       int *inline_size)
1732 {
1733         void *inline_pos;
1734 
1735         BUG_ON(offset > ext4_get_inline_size(inode));
1736 
1737         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1738                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1739                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1740         } else {
1741                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1742                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1743                 *inline_size = ext4_get_inline_size(inode) -
1744                                 EXT4_MIN_INLINE_DATA_SIZE;
1745         }
1746 
1747         if (inline_start)
1748                 *inline_start = inline_pos;
1749         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1750 }
1751 
1752 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1753 {
1754         int err, inline_size;
1755         struct ext4_iloc iloc;
1756         size_t inline_len;
1757         void *inline_pos;
1758         unsigned int offset;
1759         struct ext4_dir_entry_2 *de;
1760         bool ret = true;
1761 
1762         err = ext4_get_inode_loc(dir, &iloc);
1763         if (err) {
1764                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1765                                  err, dir->i_ino);
1766                 return true;
1767         }
1768 
1769         down_read(&EXT4_I(dir)->xattr_sem);
1770         if (!ext4_has_inline_data(dir)) {
1771                 *has_inline_data = 0;
1772                 goto out;
1773         }
1774 
1775         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1776         if (!le32_to_cpu(de->inode)) {
1777                 ext4_warning(dir->i_sb,
1778                              "bad inline directory (dir #%lu) - no `..'",
1779                              dir->i_ino);
1780                 ret = true;
1781                 goto out;
1782         }
1783 
1784         inline_len = ext4_get_inline_size(dir);
1785         offset = EXT4_INLINE_DOTDOT_SIZE;
1786         while (offset < inline_len) {
1787                 de = ext4_get_inline_entry(dir, &iloc, offset,
1788                                            &inline_pos, &inline_size);
1789                 if (ext4_check_dir_entry(dir, NULL, de,
1790                                          iloc.bh, inline_pos,
1791                                          inline_size, offset)) {
1792                         ext4_warning(dir->i_sb,
1793                                      "bad inline directory (dir #%lu) - "
1794                                      "inode %u, rec_len %u, name_len %d"
1795                                      "inline size %d",
1796                                      dir->i_ino, le32_to_cpu(de->inode),
1797                                      le16_to_cpu(de->rec_len), de->name_len,
1798                                      inline_size);
1799                         ret = true;
1800                         goto out;
1801                 }
1802                 if (le32_to_cpu(de->inode)) {
1803                         ret = false;
1804                         goto out;
1805                 }
1806                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1807         }
1808 
1809 out:
1810         up_read(&EXT4_I(dir)->xattr_sem);
1811         brelse(iloc.bh);
1812         return ret;
1813 }
1814 
1815 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1816 {
1817         int ret, no_expand;
1818 
1819         ext4_write_lock_xattr(inode, &no_expand);
1820         ret = ext4_destroy_inline_data_nolock(handle, inode);
1821         ext4_write_unlock_xattr(inode, &no_expand);
1822 
1823         return ret;
1824 }
1825 
1826 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1827 {
1828         __u64 addr;
1829         int error = -EAGAIN;
1830         struct ext4_iloc iloc;
1831 
1832         down_read(&EXT4_I(inode)->xattr_sem);
1833         if (!ext4_has_inline_data(inode))
1834                 goto out;
1835 
1836         error = ext4_get_inode_loc(inode, &iloc);
1837         if (error)
1838                 goto out;
1839 
1840         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1841         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1842         addr += offsetof(struct ext4_inode, i_block);
1843 
1844         brelse(iloc.bh);
1845 
1846         iomap->addr = addr;
1847         iomap->offset = 0;
1848         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1849                               i_size_read(inode));
1850         iomap->type = IOMAP_INLINE;
1851         iomap->flags = 0;
1852 
1853 out:
1854         up_read(&EXT4_I(inode)->xattr_sem);
1855         return error;
1856 }
1857 
1858 int ext4_inline_data_fiemap(struct inode *inode,
1859                             struct fiemap_extent_info *fieinfo,
1860                             int *has_inline, __u64 start, __u64 len)
1861 {
1862         __u64 physical = 0;
1863         __u64 inline_len;
1864         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1865                 FIEMAP_EXTENT_LAST;
1866         int error = 0;
1867         struct ext4_iloc iloc;
1868 
1869         down_read(&EXT4_I(inode)->xattr_sem);
1870         if (!ext4_has_inline_data(inode)) {
1871                 *has_inline = 0;
1872                 goto out;
1873         }
1874         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1875                            i_size_read(inode));
1876         if (start >= inline_len)
1877                 goto out;
1878         if (start + len < inline_len)
1879                 inline_len = start + len;
1880         inline_len -= start;
1881 
1882         error = ext4_get_inode_loc(inode, &iloc);
1883         if (error)
1884                 goto out;
1885 
1886         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1887         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1888         physical += offsetof(struct ext4_inode, i_block);
1889 
1890         brelse(iloc.bh);
1891 out:
1892         up_read(&EXT4_I(inode)->xattr_sem);
1893         if (physical)
1894                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1895                                                 inline_len, flags);
1896         return (error < 0 ? error : 0);
1897 }
1898 
1899 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1900 {
1901         handle_t *handle;
1902         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1903         size_t i_size;
1904         void *value = NULL;
1905         struct ext4_xattr_ibody_find is = {
1906                 .s = { .not_found = -ENODATA, },
1907         };
1908         struct ext4_xattr_info i = {
1909                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1910                 .name = EXT4_XATTR_SYSTEM_DATA,
1911         };
1912 
1913 
1914         needed_blocks = ext4_writepage_trans_blocks(inode);
1915         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1916         if (IS_ERR(handle))
1917                 return PTR_ERR(handle);
1918 
1919         ext4_write_lock_xattr(inode, &no_expand);
1920         if (!ext4_has_inline_data(inode)) {
1921                 *has_inline = 0;
1922                 ext4_journal_stop(handle);
1923                 return 0;
1924         }
1925 
1926         if ((err = ext4_orphan_add(handle, inode)) != 0)
1927                 goto out;
1928 
1929         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1930                 goto out;
1931 
1932         down_write(&EXT4_I(inode)->i_data_sem);
1933         i_size = inode->i_size;
1934         inline_size = ext4_get_inline_size(inode);
1935         EXT4_I(inode)->i_disksize = i_size;
1936 
1937         if (i_size < inline_size) {
1938                 /* Clear the content in the xattr space. */
1939                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1940                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1941                                 goto out_error;
1942 
1943                         BUG_ON(is.s.not_found);
1944 
1945                         value_len = le32_to_cpu(is.s.here->e_value_size);
1946                         value = kmalloc(value_len, GFP_NOFS);
1947                         if (!value) {
1948                                 err = -ENOMEM;
1949                                 goto out_error;
1950                         }
1951 
1952                         err = ext4_xattr_ibody_get(inode, i.name_index,
1953                                                    i.name, value, value_len);
1954                         if (err <= 0)
1955                                 goto out_error;
1956 
1957                         i.value = value;
1958                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1959                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1960                         err = ext4_xattr_ibody_inline_set(handle, inode,
1961                                                           &i, &is);
1962                         if (err)
1963                                 goto out_error;
1964                 }
1965 
1966                 /* Clear the content within i_blocks. */
1967                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1968                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1969                         memset(p + i_size, 0,
1970                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1971                 }
1972 
1973                 EXT4_I(inode)->i_inline_size = i_size <
1974                                         EXT4_MIN_INLINE_DATA_SIZE ?
1975                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1976         }
1977 
1978 out_error:
1979         up_write(&EXT4_I(inode)->i_data_sem);
1980 out:
1981         brelse(is.iloc.bh);
1982         ext4_write_unlock_xattr(inode, &no_expand);
1983         kfree(value);
1984         if (inode->i_nlink)
1985                 ext4_orphan_del(handle, inode);
1986 
1987         if (err == 0) {
1988                 inode->i_mtime = inode->i_ctime = current_time(inode);
1989                 err = ext4_mark_inode_dirty(handle, inode);
1990                 if (IS_SYNC(inode))
1991                         ext4_handle_sync(handle);
1992         }
1993         ext4_journal_stop(handle);
1994         return err;
1995 }
1996 
1997 int ext4_convert_inline_data(struct inode *inode)
1998 {
1999         int error, needed_blocks, no_expand;
2000         handle_t *handle;
2001         struct ext4_iloc iloc;
2002 
2003         if (!ext4_has_inline_data(inode)) {
2004                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2005                 return 0;
2006         }
2007 
2008         needed_blocks = ext4_writepage_trans_blocks(inode);
2009 
2010         iloc.bh = NULL;
2011         error = ext4_get_inode_loc(inode, &iloc);
2012         if (error)
2013                 return error;
2014 
2015         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2016         if (IS_ERR(handle)) {
2017                 error = PTR_ERR(handle);
2018                 goto out_free;
2019         }
2020 
2021         ext4_write_lock_xattr(inode, &no_expand);
2022         if (ext4_has_inline_data(inode))
2023                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2024         ext4_write_unlock_xattr(inode, &no_expand);
2025         ext4_journal_stop(handle);
2026 out_free:
2027         brelse(iloc.bh);
2028         return error;
2029 }
2030 

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