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

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  1 /*
  2  * Copyright (c) 2012 Taobao.
  3  * Written by Tao Ma <boyu.mt@taobao.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of version 2.1 of the GNU Lesser General Public License
  7  * as published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  */
 14 #include "ext4_jbd2.h"
 15 #include "ext4.h"
 16 #include "xattr.h"
 17 #include "truncate.h"
 18 #include <linux/fiemap.h>
 19 
 20 #define EXT4_XATTR_SYSTEM_DATA  "data"
 21 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
 22 #define EXT4_INLINE_DOTDOT_OFFSET       2
 23 #define EXT4_INLINE_DOTDOT_SIZE         4
 24 
 25 int ext4_get_inline_size(struct inode *inode)
 26 {
 27         if (EXT4_I(inode)->i_inline_off)
 28                 return EXT4_I(inode)->i_inline_size;
 29 
 30         return 0;
 31 }
 32 
 33 static int get_max_inline_xattr_value_size(struct inode *inode,
 34                                            struct ext4_iloc *iloc)
 35 {
 36         struct ext4_xattr_ibody_header *header;
 37         struct ext4_xattr_entry *entry;
 38         struct ext4_inode *raw_inode;
 39         int free, min_offs;
 40 
 41         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
 42                         EXT4_GOOD_OLD_INODE_SIZE -
 43                         EXT4_I(inode)->i_extra_isize -
 44                         sizeof(struct ext4_xattr_ibody_header);
 45 
 46         /*
 47          * We need to subtract another sizeof(__u32) since an in-inode xattr
 48          * needs an empty 4 bytes to indicate the gap between the xattr entry
 49          * and the name/value pair.
 50          */
 51         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
 52                 return EXT4_XATTR_SIZE(min_offs -
 53                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
 54                         EXT4_XATTR_ROUND - sizeof(__u32));
 55 
 56         raw_inode = ext4_raw_inode(iloc);
 57         header = IHDR(inode, raw_inode);
 58         entry = IFIRST(header);
 59 
 60         /* Compute min_offs. */
 61         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
 62                 if (!entry->e_value_block && entry->e_value_size) {
 63                         size_t offs = le16_to_cpu(entry->e_value_offs);
 64                         if (offs < min_offs)
 65                                 min_offs = offs;
 66                 }
 67         }
 68         free = min_offs -
 69                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
 70 
 71         if (EXT4_I(inode)->i_inline_off) {
 72                 entry = (struct ext4_xattr_entry *)
 73                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
 74 
 75                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
 76                 goto out;
 77         }
 78 
 79         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
 80 
 81         if (free > EXT4_XATTR_ROUND)
 82                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
 83         else
 84                 free = 0;
 85 
 86 out:
 87         return free;
 88 }
 89 
 90 /*
 91  * Get the maximum size we now can store in an inode.
 92  * If we can't find the space for a xattr entry, don't use the space
 93  * of the extents since we have no space to indicate the inline data.
 94  */
 95 int ext4_get_max_inline_size(struct inode *inode)
 96 {
 97         int error, max_inline_size;
 98         struct ext4_iloc iloc;
 99 
100         if (EXT4_I(inode)->i_extra_isize == 0)
101                 return 0;
102 
103         error = ext4_get_inode_loc(inode, &iloc);
104         if (error) {
105                 ext4_error_inode(inode, __func__, __LINE__, 0,
106                                  "can't get inode location %lu",
107                                  inode->i_ino);
108                 return 0;
109         }
110 
111         down_read(&EXT4_I(inode)->xattr_sem);
112         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
113         up_read(&EXT4_I(inode)->xattr_sem);
114 
115         brelse(iloc.bh);
116 
117         if (!max_inline_size)
118                 return 0;
119 
120         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
121 }
122 
123 int ext4_has_inline_data(struct inode *inode)
124 {
125         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
126                EXT4_I(inode)->i_inline_off;
127 }
128 
129 /*
130  * this function does not take xattr_sem, which is OK because it is
131  * currently only used in a code path coming form ext4_iget, before
132  * the new inode has been unlocked
133  */
134 int ext4_find_inline_data_nolock(struct inode *inode)
135 {
136         struct ext4_xattr_ibody_find is = {
137                 .s = { .not_found = -ENODATA, },
138         };
139         struct ext4_xattr_info i = {
140                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
141                 .name = EXT4_XATTR_SYSTEM_DATA,
142         };
143         int error;
144 
145         if (EXT4_I(inode)->i_extra_isize == 0)
146                 return 0;
147 
148         error = ext4_get_inode_loc(inode, &is.iloc);
149         if (error)
150                 return error;
151 
152         error = ext4_xattr_ibody_find(inode, &i, &is);
153         if (error)
154                 goto out;
155 
156         if (!is.s.not_found) {
157                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
158                                         (void *)ext4_raw_inode(&is.iloc));
159                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
160                                 le32_to_cpu(is.s.here->e_value_size);
161                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
162         }
163 out:
164         brelse(is.iloc.bh);
165         return error;
166 }
167 
168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
169                                  unsigned int len,
170                                  struct ext4_iloc *iloc)
171 {
172         struct ext4_xattr_entry *entry;
173         struct ext4_xattr_ibody_header *header;
174         int cp_len = 0;
175         struct ext4_inode *raw_inode;
176 
177         if (!len)
178                 return 0;
179 
180         BUG_ON(len > EXT4_I(inode)->i_inline_size);
181 
182         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
183                         len : EXT4_MIN_INLINE_DATA_SIZE;
184 
185         raw_inode = ext4_raw_inode(iloc);
186         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
187 
188         len -= cp_len;
189         buffer += cp_len;
190 
191         if (!len)
192                 goto out;
193 
194         header = IHDR(inode, raw_inode);
195         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
196                                             EXT4_I(inode)->i_inline_off);
197         len = min_t(unsigned int, len,
198                     (unsigned int)le32_to_cpu(entry->e_value_size));
199 
200         memcpy(buffer,
201                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
202         cp_len += len;
203 
204 out:
205         return cp_len;
206 }
207 
208 /*
209  * write the buffer to the inline inode.
210  * If 'create' is set, we don't need to do the extra copy in the xattr
211  * value since it is already handled by ext4_xattr_ibody_inline_set.
212  * That saves us one memcpy.
213  */
214 void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
215                             void *buffer, loff_t pos, unsigned int len)
216 {
217         struct ext4_xattr_entry *entry;
218         struct ext4_xattr_ibody_header *header;
219         struct ext4_inode *raw_inode;
220         int cp_len = 0;
221 
222         BUG_ON(!EXT4_I(inode)->i_inline_off);
223         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
224 
225         raw_inode = ext4_raw_inode(iloc);
226         buffer += pos;
227 
228         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
229                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
230                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
231                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
232 
233                 len -= cp_len;
234                 buffer += cp_len;
235                 pos += cp_len;
236         }
237 
238         if (!len)
239                 return;
240 
241         pos -= EXT4_MIN_INLINE_DATA_SIZE;
242         header = IHDR(inode, raw_inode);
243         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
244                                             EXT4_I(inode)->i_inline_off);
245 
246         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
247                buffer, len);
248 }
249 
250 static int ext4_create_inline_data(handle_t *handle,
251                                    struct inode *inode, unsigned len)
252 {
253         int error;
254         void *value = NULL;
255         struct ext4_xattr_ibody_find is = {
256                 .s = { .not_found = -ENODATA, },
257         };
258         struct ext4_xattr_info i = {
259                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
260                 .name = EXT4_XATTR_SYSTEM_DATA,
261         };
262 
263         error = ext4_get_inode_loc(inode, &is.iloc);
264         if (error)
265                 return error;
266 
267         error = ext4_journal_get_write_access(handle, is.iloc.bh);
268         if (error)
269                 goto out;
270 
271         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
272                 value = EXT4_ZERO_XATTR_VALUE;
273                 len -= EXT4_MIN_INLINE_DATA_SIZE;
274         } else {
275                 value = "";
276                 len = 0;
277         }
278 
279         /* Insert the the xttr entry. */
280         i.value = value;
281         i.value_len = len;
282 
283         error = ext4_xattr_ibody_find(inode, &i, &is);
284         if (error)
285                 goto out;
286 
287         BUG_ON(!is.s.not_found);
288 
289         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
290         if (error) {
291                 if (error == -ENOSPC)
292                         ext4_clear_inode_state(inode,
293                                                EXT4_STATE_MAY_INLINE_DATA);
294                 goto out;
295         }
296 
297         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
298                 0, EXT4_MIN_INLINE_DATA_SIZE);
299 
300         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
301                                       (void *)ext4_raw_inode(&is.iloc));
302         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
303         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
304         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
305         get_bh(is.iloc.bh);
306         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
307 
308 out:
309         brelse(is.iloc.bh);
310         return error;
311 }
312 
313 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
314                                    unsigned int len)
315 {
316         int error;
317         void *value = NULL;
318         struct ext4_xattr_ibody_find is = {
319                 .s = { .not_found = -ENODATA, },
320         };
321         struct ext4_xattr_info i = {
322                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
323                 .name = EXT4_XATTR_SYSTEM_DATA,
324         };
325 
326         /* If the old space is ok, write the data directly. */
327         if (len <= EXT4_I(inode)->i_inline_size)
328                 return 0;
329 
330         error = ext4_get_inode_loc(inode, &is.iloc);
331         if (error)
332                 return error;
333 
334         error = ext4_xattr_ibody_find(inode, &i, &is);
335         if (error)
336                 goto out;
337 
338         BUG_ON(is.s.not_found);
339 
340         len -= EXT4_MIN_INLINE_DATA_SIZE;
341         value = kzalloc(len, GFP_NOFS);
342         if (!value) {
343                 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         error = ext4_journal_get_write_access(handle, is.iloc.bh);
353         if (error)
354                 goto out;
355 
356         /* Update the xttr entry. */
357         i.value = value;
358         i.value_len = len;
359 
360         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
361         if (error)
362                 goto out;
363 
364         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
365                                       (void *)ext4_raw_inode(&is.iloc));
366         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
367                                 le32_to_cpu(is.s.here->e_value_size);
368         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
369         get_bh(is.iloc.bh);
370         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
371 
372 out:
373         kfree(value);
374         brelse(is.iloc.bh);
375         return error;
376 }
377 
378 int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
379                              unsigned int len)
380 {
381         int ret, size;
382         struct ext4_inode_info *ei = EXT4_I(inode);
383 
384         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
385                 return -ENOSPC;
386 
387         size = ext4_get_max_inline_size(inode);
388         if (size < len)
389                 return -ENOSPC;
390 
391         down_write(&EXT4_I(inode)->xattr_sem);
392 
393         if (ei->i_inline_off)
394                 ret = ext4_update_inline_data(handle, inode, len);
395         else
396                 ret = ext4_create_inline_data(handle, inode, len);
397 
398         up_write(&EXT4_I(inode)->xattr_sem);
399 
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         error = ext4_journal_get_write_access(handle, is.iloc.bh);
430         if (error)
431                 goto out;
432 
433         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
434         if (error)
435                 goto out;
436 
437         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
438                 0, EXT4_MIN_INLINE_DATA_SIZE);
439 
440         if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
441                                       EXT4_FEATURE_INCOMPAT_EXTENTS)) {
442                 if (S_ISDIR(inode->i_mode) ||
443                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
444                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
445                         ext4_ext_tree_init(handle, inode);
446                 }
447         }
448         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
449 
450         get_bh(is.iloc.bh);
451         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
452 
453         EXT4_I(inode)->i_inline_off = 0;
454         EXT4_I(inode)->i_inline_size = 0;
455         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
456 out:
457         brelse(is.iloc.bh);
458         if (error == -ENODATA)
459                 error = 0;
460         return error;
461 }
462 
463 static int ext4_read_inline_page(struct inode *inode, struct page *page)
464 {
465         void *kaddr;
466         int ret = 0;
467         size_t len;
468         struct ext4_iloc iloc;
469 
470         BUG_ON(!PageLocked(page));
471         BUG_ON(!ext4_has_inline_data(inode));
472         BUG_ON(page->index);
473 
474         if (!EXT4_I(inode)->i_inline_off) {
475                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
476                              inode->i_ino);
477                 goto out;
478         }
479 
480         ret = ext4_get_inode_loc(inode, &iloc);
481         if (ret)
482                 goto out;
483 
484         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
485         kaddr = kmap_atomic(page);
486         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
487         flush_dcache_page(page);
488         kunmap_atomic(kaddr);
489         zero_user_segment(page, len, PAGE_CACHE_SIZE);
490         SetPageUptodate(page);
491         brelse(iloc.bh);
492 
493 out:
494         return ret;
495 }
496 
497 int ext4_readpage_inline(struct inode *inode, struct page *page)
498 {
499         int ret = 0;
500 
501         down_read(&EXT4_I(inode)->xattr_sem);
502         if (!ext4_has_inline_data(inode)) {
503                 up_read(&EXT4_I(inode)->xattr_sem);
504                 return -EAGAIN;
505         }
506 
507         /*
508          * Current inline data can only exist in the 1st page,
509          * So for all the other pages, just set them uptodate.
510          */
511         if (!page->index)
512                 ret = ext4_read_inline_page(inode, page);
513         else if (!PageUptodate(page)) {
514                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
515                 SetPageUptodate(page);
516         }
517 
518         up_read(&EXT4_I(inode)->xattr_sem);
519 
520         unlock_page(page);
521         return ret >= 0 ? 0 : ret;
522 }
523 
524 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
525                                               struct inode *inode,
526                                               unsigned flags)
527 {
528         int ret, needed_blocks;
529         handle_t *handle = NULL;
530         int retries = 0, sem_held = 0;
531         struct page *page = NULL;
532         unsigned from, to;
533         struct ext4_iloc iloc;
534 
535         if (!ext4_has_inline_data(inode)) {
536                 /*
537                  * clear the flag so that no new write
538                  * will trap here again.
539                  */
540                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
541                 return 0;
542         }
543 
544         needed_blocks = ext4_writepage_trans_blocks(inode);
545 
546         ret = ext4_get_inode_loc(inode, &iloc);
547         if (ret)
548                 return ret;
549 
550 retry:
551         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
552         if (IS_ERR(handle)) {
553                 ret = PTR_ERR(handle);
554                 handle = NULL;
555                 goto out;
556         }
557 
558         /* We cannot recurse into the filesystem as the transaction is already
559          * started */
560         flags |= AOP_FLAG_NOFS;
561 
562         page = grab_cache_page_write_begin(mapping, 0, flags);
563         if (!page) {
564                 ret = -ENOMEM;
565                 goto out;
566         }
567 
568         down_write(&EXT4_I(inode)->xattr_sem);
569         sem_held = 1;
570         /* If some one has already done this for us, just exit. */
571         if (!ext4_has_inline_data(inode)) {
572                 ret = 0;
573                 goto out;
574         }
575 
576         from = 0;
577         to = ext4_get_inline_size(inode);
578         if (!PageUptodate(page)) {
579                 ret = ext4_read_inline_page(inode, page);
580                 if (ret < 0)
581                         goto out;
582         }
583 
584         ret = ext4_destroy_inline_data_nolock(handle, inode);
585         if (ret)
586                 goto out;
587 
588         if (ext4_should_dioread_nolock(inode))
589                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
590         else
591                 ret = __block_write_begin(page, from, to, ext4_get_block);
592 
593         if (!ret && ext4_should_journal_data(inode)) {
594                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
595                                              from, to, NULL,
596                                              do_journal_get_write_access);
597         }
598 
599         if (ret) {
600                 unlock_page(page);
601                 page_cache_release(page);
602                 ext4_orphan_add(handle, inode);
603                 up_write(&EXT4_I(inode)->xattr_sem);
604                 sem_held = 0;
605                 ext4_journal_stop(handle);
606                 handle = NULL;
607                 ext4_truncate_failed_write(inode);
608                 /*
609                  * If truncate failed early the inode might
610                  * still be on the orphan list; we need to
611                  * make sure the inode is removed from the
612                  * orphan list in that case.
613                  */
614                 if (inode->i_nlink)
615                         ext4_orphan_del(NULL, inode);
616         }
617 
618         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
619                 goto retry;
620 
621         block_commit_write(page, from, to);
622 out:
623         if (page) {
624                 unlock_page(page);
625                 page_cache_release(page);
626         }
627         if (sem_held)
628                 up_write(&EXT4_I(inode)->xattr_sem);
629         if (handle)
630                 ext4_journal_stop(handle);
631         brelse(iloc.bh);
632         return ret;
633 }
634 
635 /*
636  * Try to write data in the inode.
637  * If the inode has inline data, check whether the new write can be
638  * in the inode also. If not, create the page the handle, move the data
639  * to the page make it update and let the later codes create extent for it.
640  */
641 int ext4_try_to_write_inline_data(struct address_space *mapping,
642                                   struct inode *inode,
643                                   loff_t pos, unsigned len,
644                                   unsigned flags,
645                                   struct page **pagep)
646 {
647         int ret;
648         handle_t *handle;
649         struct page *page;
650         struct ext4_iloc iloc;
651 
652         if (pos + len > ext4_get_max_inline_size(inode))
653                 goto convert;
654 
655         ret = ext4_get_inode_loc(inode, &iloc);
656         if (ret)
657                 return ret;
658 
659         /*
660          * The possible write could happen in the inode,
661          * so try to reserve the space in inode first.
662          */
663         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
664         if (IS_ERR(handle)) {
665                 ret = PTR_ERR(handle);
666                 handle = NULL;
667                 goto out;
668         }
669 
670         ret = ext4_prepare_inline_data(handle, inode, pos + len);
671         if (ret && ret != -ENOSPC)
672                 goto out;
673 
674         /* We don't have space in inline inode, so convert it to extent. */
675         if (ret == -ENOSPC) {
676                 ext4_journal_stop(handle);
677                 brelse(iloc.bh);
678                 goto convert;
679         }
680 
681         flags |= AOP_FLAG_NOFS;
682 
683         page = grab_cache_page_write_begin(mapping, 0, flags);
684         if (!page) {
685                 ret = -ENOMEM;
686                 goto out;
687         }
688 
689         *pagep = page;
690         down_read(&EXT4_I(inode)->xattr_sem);
691         if (!ext4_has_inline_data(inode)) {
692                 ret = 0;
693                 unlock_page(page);
694                 page_cache_release(page);
695                 goto out_up_read;
696         }
697 
698         if (!PageUptodate(page)) {
699                 ret = ext4_read_inline_page(inode, page);
700                 if (ret < 0)
701                         goto out_up_read;
702         }
703 
704         ret = 1;
705         handle = NULL;
706 out_up_read:
707         up_read(&EXT4_I(inode)->xattr_sem);
708 out:
709         if (handle)
710                 ext4_journal_stop(handle);
711         brelse(iloc.bh);
712         return ret;
713 convert:
714         return ext4_convert_inline_data_to_extent(mapping,
715                                                   inode, flags);
716 }
717 
718 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
719                                unsigned copied, struct page *page)
720 {
721         int ret;
722         void *kaddr;
723         struct ext4_iloc iloc;
724 
725         if (unlikely(copied < len)) {
726                 if (!PageUptodate(page)) {
727                         copied = 0;
728                         goto out;
729                 }
730         }
731 
732         ret = ext4_get_inode_loc(inode, &iloc);
733         if (ret) {
734                 ext4_std_error(inode->i_sb, ret);
735                 copied = 0;
736                 goto out;
737         }
738 
739         down_write(&EXT4_I(inode)->xattr_sem);
740         BUG_ON(!ext4_has_inline_data(inode));
741 
742         kaddr = kmap_atomic(page);
743         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
744         kunmap_atomic(kaddr);
745         SetPageUptodate(page);
746         /* clear page dirty so that writepages wouldn't work for us. */
747         ClearPageDirty(page);
748 
749         up_write(&EXT4_I(inode)->xattr_sem);
750         brelse(iloc.bh);
751 out:
752         return copied;
753 }
754 
755 struct buffer_head *
756 ext4_journalled_write_inline_data(struct inode *inode,
757                                   unsigned len,
758                                   struct page *page)
759 {
760         int ret;
761         void *kaddr;
762         struct ext4_iloc iloc;
763 
764         ret = ext4_get_inode_loc(inode, &iloc);
765         if (ret) {
766                 ext4_std_error(inode->i_sb, ret);
767                 return NULL;
768         }
769 
770         down_write(&EXT4_I(inode)->xattr_sem);
771         kaddr = kmap_atomic(page);
772         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
773         kunmap_atomic(kaddr);
774         up_write(&EXT4_I(inode)->xattr_sem);
775 
776         return iloc.bh;
777 }
778 
779 /*
780  * Try to make the page cache and handle ready for the inline data case.
781  * We can call this function in 2 cases:
782  * 1. The inode is created and the first write exceeds inline size. We can
783  *    clear the inode state safely.
784  * 2. The inode has inline data, then we need to read the data, make it
785  *    update and dirty so that ext4_da_writepages can handle it. We don't
786  *    need to start the journal since the file's metatdata isn't changed now.
787  */
788 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
789                                                  struct inode *inode,
790                                                  unsigned flags,
791                                                  void **fsdata)
792 {
793         int ret = 0, inline_size;
794         struct page *page;
795 
796         page = grab_cache_page_write_begin(mapping, 0, flags);
797         if (!page)
798                 return -ENOMEM;
799 
800         down_read(&EXT4_I(inode)->xattr_sem);
801         if (!ext4_has_inline_data(inode)) {
802                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
803                 goto out;
804         }
805 
806         inline_size = ext4_get_inline_size(inode);
807 
808         if (!PageUptodate(page)) {
809                 ret = ext4_read_inline_page(inode, page);
810                 if (ret < 0)
811                         goto out;
812         }
813 
814         ret = __block_write_begin(page, 0, inline_size,
815                                   ext4_da_get_block_prep);
816         if (ret) {
817                 ext4_truncate_failed_write(inode);
818                 goto out;
819         }
820 
821         SetPageDirty(page);
822         SetPageUptodate(page);
823         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
824         *fsdata = (void *)CONVERT_INLINE_DATA;
825 
826 out:
827         up_read(&EXT4_I(inode)->xattr_sem);
828         if (page) {
829                 unlock_page(page);
830                 page_cache_release(page);
831         }
832         return ret;
833 }
834 
835 /*
836  * Prepare the write for the inline data.
837  * If the the data can be written into the inode, we just read
838  * the page and make it uptodate, and start the journal.
839  * Otherwise read the page, makes it dirty so that it can be
840  * handle in writepages(the i_disksize update is left to the
841  * normal ext4_da_write_end).
842  */
843 int ext4_da_write_inline_data_begin(struct address_space *mapping,
844                                     struct inode *inode,
845                                     loff_t pos, unsigned len,
846                                     unsigned flags,
847                                     struct page **pagep,
848                                     void **fsdata)
849 {
850         int ret, inline_size;
851         handle_t *handle;
852         struct page *page;
853         struct ext4_iloc iloc;
854 
855         ret = ext4_get_inode_loc(inode, &iloc);
856         if (ret)
857                 return ret;
858 
859         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
860         if (IS_ERR(handle)) {
861                 ret = PTR_ERR(handle);
862                 handle = NULL;
863                 goto out;
864         }
865 
866         inline_size = ext4_get_max_inline_size(inode);
867 
868         ret = -ENOSPC;
869         if (inline_size >= pos + len) {
870                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
871                 if (ret && ret != -ENOSPC)
872                         goto out;
873         }
874 
875         if (ret == -ENOSPC) {
876                 ret = ext4_da_convert_inline_data_to_extent(mapping,
877                                                             inode,
878                                                             flags,
879                                                             fsdata);
880                 goto out;
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         page = grab_cache_page_write_begin(mapping, 0, flags);
890         if (!page) {
891                 ret = -ENOMEM;
892                 goto out;
893         }
894 
895         down_read(&EXT4_I(inode)->xattr_sem);
896         if (!ext4_has_inline_data(inode)) {
897                 ret = 0;
898                 goto out_release_page;
899         }
900 
901         if (!PageUptodate(page)) {
902                 ret = ext4_read_inline_page(inode, page);
903                 if (ret < 0)
904                         goto out_release_page;
905         }
906 
907         up_read(&EXT4_I(inode)->xattr_sem);
908         *pagep = page;
909         handle = NULL;
910         brelse(iloc.bh);
911         return 1;
912 out_release_page:
913         up_read(&EXT4_I(inode)->xattr_sem);
914         unlock_page(page);
915         page_cache_release(page);
916 out:
917         if (handle)
918                 ext4_journal_stop(handle);
919         brelse(iloc.bh);
920         return ret;
921 }
922 
923 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
924                                   unsigned len, unsigned copied,
925                                   struct page *page)
926 {
927         int i_size_changed = 0;
928 
929         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
930 
931         /*
932          * No need to use i_size_read() here, the i_size
933          * cannot change under us because we hold i_mutex.
934          *
935          * But it's important to update i_size while still holding page lock:
936          * page writeout could otherwise come in and zero beyond i_size.
937          */
938         if (pos+copied > inode->i_size) {
939                 i_size_write(inode, pos+copied);
940                 i_size_changed = 1;
941         }
942         unlock_page(page);
943         page_cache_release(page);
944 
945         /*
946          * Don't mark the inode dirty under page lock. First, it unnecessarily
947          * makes the holding time of page lock longer. Second, it forces lock
948          * ordering of page lock and transaction start for journaling
949          * filesystems.
950          */
951         if (i_size_changed)
952                 mark_inode_dirty(inode);
953 
954         return copied;
955 }
956 
957 #ifdef INLINE_DIR_DEBUG
958 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
959                           void *inline_start, int inline_size)
960 {
961         int offset;
962         unsigned short de_len;
963         struct ext4_dir_entry_2 *de = inline_start;
964         void *dlimit = inline_start + inline_size;
965 
966         trace_printk("inode %lu\n", dir->i_ino);
967         offset = 0;
968         while ((void *)de < dlimit) {
969                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
970                 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
971                              offset, de_len, de->name_len, de->name,
972                              de->name_len, le32_to_cpu(de->inode));
973                 if (ext4_check_dir_entry(dir, NULL, de, bh,
974                                          inline_start, inline_size, offset))
975                         BUG();
976 
977                 offset += de_len;
978                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
979         }
980 }
981 #else
982 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
983 #endif
984 
985 /*
986  * Add a new entry into a inline dir.
987  * It will return -ENOSPC if no space is available, and -EIO
988  * and -EEXIST if directory entry already exists.
989  */
990 static int ext4_add_dirent_to_inline(handle_t *handle,
991                                      struct dentry *dentry,
992                                      struct inode *inode,
993                                      struct ext4_iloc *iloc,
994                                      void *inline_start, int inline_size)
995 {
996         struct inode    *dir = dentry->d_parent->d_inode;
997         const char      *name = dentry->d_name.name;
998         int             namelen = dentry->d_name.len;
999         unsigned short  reclen;
1000         int             err;
1001         struct ext4_dir_entry_2 *de;
1002 
1003         reclen = EXT4_DIR_REC_LEN(namelen);
1004         err = ext4_find_dest_de(dir, inode, iloc->bh,
1005                                 inline_start, inline_size,
1006                                 name, namelen, &de);
1007         if (err)
1008                 return err;
1009 
1010         err = ext4_journal_get_write_access(handle, iloc->bh);
1011         if (err)
1012                 return err;
1013         ext4_insert_dentry(inode, de, inline_size, name, namelen);
1014 
1015         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1016 
1017         /*
1018          * XXX shouldn't update any times until successful
1019          * completion of syscall, but too many callers depend
1020          * on this.
1021          *
1022          * XXX similarly, too many callers depend on
1023          * ext4_new_inode() setting the times, but error
1024          * recovery deletes the inode, so the worst that can
1025          * happen is that the times are slightly out of date
1026          * and/or different from the directory change time.
1027          */
1028         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1029         ext4_update_dx_flag(dir);
1030         dir->i_version++;
1031         ext4_mark_inode_dirty(handle, dir);
1032         return 1;
1033 }
1034 
1035 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1036                                        struct ext4_iloc *iloc)
1037 {
1038         struct ext4_xattr_entry *entry;
1039         struct ext4_xattr_ibody_header *header;
1040 
1041         BUG_ON(!EXT4_I(inode)->i_inline_off);
1042 
1043         header = IHDR(inode, ext4_raw_inode(iloc));
1044         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1045                                             EXT4_I(inode)->i_inline_off);
1046 
1047         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1048 }
1049 
1050 /* Set the final de to cover the whole block. */
1051 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1052 {
1053         struct ext4_dir_entry_2 *de, *prev_de;
1054         void *limit;
1055         int de_len;
1056 
1057         de = (struct ext4_dir_entry_2 *)de_buf;
1058         if (old_size) {
1059                 limit = de_buf + old_size;
1060                 do {
1061                         prev_de = de;
1062                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1063                         de_buf += de_len;
1064                         de = (struct ext4_dir_entry_2 *)de_buf;
1065                 } while (de_buf < limit);
1066 
1067                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1068                                                         old_size, new_size);
1069         } else {
1070                 /* this is just created, so create an empty entry. */
1071                 de->inode = 0;
1072                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1073         }
1074 }
1075 
1076 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1077                                   struct ext4_iloc *iloc)
1078 {
1079         int ret;
1080         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1081         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1082 
1083         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1084                 return -ENOSPC;
1085 
1086         ret = ext4_update_inline_data(handle, dir,
1087                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1088         if (ret)
1089                 return ret;
1090 
1091         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1092                              EXT4_I(dir)->i_inline_size -
1093                                                 EXT4_MIN_INLINE_DATA_SIZE);
1094         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1095         return 0;
1096 }
1097 
1098 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1099                                      struct ext4_iloc *iloc,
1100                                      void *buf, int inline_size)
1101 {
1102         ext4_create_inline_data(handle, inode, inline_size);
1103         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1104         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1105 }
1106 
1107 static int ext4_finish_convert_inline_dir(handle_t *handle,
1108                                           struct inode *inode,
1109                                           struct buffer_head *dir_block,
1110                                           void *buf,
1111                                           int inline_size)
1112 {
1113         int err, csum_size = 0, header_size = 0;
1114         struct ext4_dir_entry_2 *de;
1115         struct ext4_dir_entry_tail *t;
1116         void *target = dir_block->b_data;
1117 
1118         /*
1119          * First create "." and ".." and then copy the dir information
1120          * back to the block.
1121          */
1122         de = (struct ext4_dir_entry_2 *)target;
1123         de = ext4_init_dot_dotdot(inode, de,
1124                 inode->i_sb->s_blocksize, csum_size,
1125                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1126         header_size = (void *)de - target;
1127 
1128         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1129                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1130 
1131         if (ext4_has_metadata_csum(inode->i_sb))
1132                 csum_size = sizeof(struct ext4_dir_entry_tail);
1133 
1134         inode->i_size = inode->i_sb->s_blocksize;
1135         i_size_write(inode, inode->i_sb->s_blocksize);
1136         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1137         ext4_update_final_de(dir_block->b_data,
1138                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1139                         inode->i_sb->s_blocksize - csum_size);
1140 
1141         if (csum_size) {
1142                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1143                                      inode->i_sb->s_blocksize);
1144                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1145         }
1146         set_buffer_uptodate(dir_block);
1147         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1148         if (err)
1149                 return err;
1150         set_buffer_verified(dir_block);
1151         return ext4_mark_inode_dirty(handle, inode);
1152 }
1153 
1154 static int ext4_convert_inline_data_nolock(handle_t *handle,
1155                                            struct inode *inode,
1156                                            struct ext4_iloc *iloc)
1157 {
1158         int error;
1159         void *buf = NULL;
1160         struct buffer_head *data_bh = NULL;
1161         struct ext4_map_blocks map;
1162         int inline_size;
1163 
1164         inline_size = ext4_get_inline_size(inode);
1165         buf = kmalloc(inline_size, GFP_NOFS);
1166         if (!buf) {
1167                 error = -ENOMEM;
1168                 goto out;
1169         }
1170 
1171         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1172         if (error < 0)
1173                 goto out;
1174 
1175         error = ext4_destroy_inline_data_nolock(handle, inode);
1176         if (error)
1177                 goto out;
1178 
1179         map.m_lblk = 0;
1180         map.m_len = 1;
1181         map.m_flags = 0;
1182         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1183         if (error < 0)
1184                 goto out_restore;
1185         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1186                 error = -EIO;
1187                 goto out_restore;
1188         }
1189 
1190         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1191         if (!data_bh) {
1192                 error = -ENOMEM;
1193                 goto out_restore;
1194         }
1195 
1196         lock_buffer(data_bh);
1197         error = ext4_journal_get_create_access(handle, data_bh);
1198         if (error) {
1199                 unlock_buffer(data_bh);
1200                 error = -EIO;
1201                 goto out_restore;
1202         }
1203         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1204 
1205         if (!S_ISDIR(inode->i_mode)) {
1206                 memcpy(data_bh->b_data, buf, inline_size);
1207                 set_buffer_uptodate(data_bh);
1208                 error = ext4_handle_dirty_metadata(handle,
1209                                                    inode, data_bh);
1210         } else {
1211                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1212                                                        buf, inline_size);
1213         }
1214 
1215         unlock_buffer(data_bh);
1216 out_restore:
1217         if (error)
1218                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1219 
1220 out:
1221         brelse(data_bh);
1222         kfree(buf);
1223         return error;
1224 }
1225 
1226 /*
1227  * Try to add the new entry to the inline data.
1228  * If succeeds, return 0. If not, extended the inline dir and copied data to
1229  * the new created block.
1230  */
1231 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1232                               struct inode *inode)
1233 {
1234         int ret, inline_size;
1235         void *inline_start;
1236         struct ext4_iloc iloc;
1237         struct inode *dir = dentry->d_parent->d_inode;
1238 
1239         ret = ext4_get_inode_loc(dir, &iloc);
1240         if (ret)
1241                 return ret;
1242 
1243         down_write(&EXT4_I(dir)->xattr_sem);
1244         if (!ext4_has_inline_data(dir))
1245                 goto out;
1246 
1247         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1248                                                  EXT4_INLINE_DOTDOT_SIZE;
1249         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1250 
1251         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1252                                         inline_start, inline_size);
1253         if (ret != -ENOSPC)
1254                 goto out;
1255 
1256         /* check whether it can be inserted to inline xattr space. */
1257         inline_size = EXT4_I(dir)->i_inline_size -
1258                         EXT4_MIN_INLINE_DATA_SIZE;
1259         if (!inline_size) {
1260                 /* Try to use the xattr space.*/
1261                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1262                 if (ret && ret != -ENOSPC)
1263                         goto out;
1264 
1265                 inline_size = EXT4_I(dir)->i_inline_size -
1266                                 EXT4_MIN_INLINE_DATA_SIZE;
1267         }
1268 
1269         if (inline_size) {
1270                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1271 
1272                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1273                                                 inline_start, inline_size);
1274 
1275                 if (ret != -ENOSPC)
1276                         goto out;
1277         }
1278 
1279         /*
1280          * The inline space is filled up, so create a new block for it.
1281          * As the extent tree will be created, we have to save the inline
1282          * dir first.
1283          */
1284         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1285 
1286 out:
1287         ext4_mark_inode_dirty(handle, dir);
1288         up_write(&EXT4_I(dir)->xattr_sem);
1289         brelse(iloc.bh);
1290         return ret;
1291 }
1292 
1293 /*
1294  * This function fills a red-black tree with information from an
1295  * inlined dir.  It returns the number directory entries loaded
1296  * into the tree.  If there is an error it is returned in err.
1297  */
1298 int htree_inlinedir_to_tree(struct file *dir_file,
1299                             struct inode *dir, ext4_lblk_t block,
1300                             struct dx_hash_info *hinfo,
1301                             __u32 start_hash, __u32 start_minor_hash,
1302                             int *has_inline_data)
1303 {
1304         int err = 0, count = 0;
1305         unsigned int parent_ino;
1306         int pos;
1307         struct ext4_dir_entry_2 *de;
1308         struct inode *inode = file_inode(dir_file);
1309         int ret, inline_size = 0;
1310         struct ext4_iloc iloc;
1311         void *dir_buf = NULL;
1312         struct ext4_dir_entry_2 fake;
1313 
1314         ret = ext4_get_inode_loc(inode, &iloc);
1315         if (ret)
1316                 return ret;
1317 
1318         down_read(&EXT4_I(inode)->xattr_sem);
1319         if (!ext4_has_inline_data(inode)) {
1320                 up_read(&EXT4_I(inode)->xattr_sem);
1321                 *has_inline_data = 0;
1322                 goto out;
1323         }
1324 
1325         inline_size = ext4_get_inline_size(inode);
1326         dir_buf = kmalloc(inline_size, GFP_NOFS);
1327         if (!dir_buf) {
1328                 ret = -ENOMEM;
1329                 up_read(&EXT4_I(inode)->xattr_sem);
1330                 goto out;
1331         }
1332 
1333         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1334         up_read(&EXT4_I(inode)->xattr_sem);
1335         if (ret < 0)
1336                 goto out;
1337 
1338         pos = 0;
1339         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1340         while (pos < inline_size) {
1341                 /*
1342                  * As inlined dir doesn't store any information about '.' and
1343                  * only the inode number of '..' is stored, we have to handle
1344                  * them differently.
1345                  */
1346                 if (pos == 0) {
1347                         fake.inode = cpu_to_le32(inode->i_ino);
1348                         fake.name_len = 1;
1349                         strcpy(fake.name, ".");
1350                         fake.rec_len = ext4_rec_len_to_disk(
1351                                                 EXT4_DIR_REC_LEN(fake.name_len),
1352                                                 inline_size);
1353                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1354                         de = &fake;
1355                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1356                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1357                         fake.inode = cpu_to_le32(parent_ino);
1358                         fake.name_len = 2;
1359                         strcpy(fake.name, "..");
1360                         fake.rec_len = ext4_rec_len_to_disk(
1361                                                 EXT4_DIR_REC_LEN(fake.name_len),
1362                                                 inline_size);
1363                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1364                         de = &fake;
1365                         pos = EXT4_INLINE_DOTDOT_SIZE;
1366                 } else {
1367                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1368                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1369                         if (ext4_check_dir_entry(inode, dir_file, de,
1370                                          iloc.bh, dir_buf,
1371                                          inline_size, pos)) {
1372                                 ret = count;
1373                                 goto out;
1374                         }
1375                 }
1376 
1377                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1378                 if ((hinfo->hash < start_hash) ||
1379                     ((hinfo->hash == start_hash) &&
1380                      (hinfo->minor_hash < start_minor_hash)))
1381                         continue;
1382                 if (de->inode == 0)
1383                         continue;
1384                 err = ext4_htree_store_dirent(dir_file,
1385                                    hinfo->hash, hinfo->minor_hash, de);
1386                 if (err) {
1387                         count = err;
1388                         goto out;
1389                 }
1390                 count++;
1391         }
1392         ret = count;
1393 out:
1394         kfree(dir_buf);
1395         brelse(iloc.bh);
1396         return ret;
1397 }
1398 
1399 /*
1400  * So this function is called when the volume is mkfsed with
1401  * dir_index disabled. In order to keep f_pos persistent
1402  * after we convert from an inlined dir to a blocked based,
1403  * we just pretend that we are a normal dir and return the
1404  * offset as if '.' and '..' really take place.
1405  *
1406  */
1407 int ext4_read_inline_dir(struct file *file,
1408                          struct dir_context *ctx,
1409                          int *has_inline_data)
1410 {
1411         unsigned int offset, parent_ino;
1412         int i;
1413         struct ext4_dir_entry_2 *de;
1414         struct super_block *sb;
1415         struct inode *inode = file_inode(file);
1416         int ret, inline_size = 0;
1417         struct ext4_iloc iloc;
1418         void *dir_buf = NULL;
1419         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1420 
1421         ret = ext4_get_inode_loc(inode, &iloc);
1422         if (ret)
1423                 return ret;
1424 
1425         down_read(&EXT4_I(inode)->xattr_sem);
1426         if (!ext4_has_inline_data(inode)) {
1427                 up_read(&EXT4_I(inode)->xattr_sem);
1428                 *has_inline_data = 0;
1429                 goto out;
1430         }
1431 
1432         inline_size = ext4_get_inline_size(inode);
1433         dir_buf = kmalloc(inline_size, GFP_NOFS);
1434         if (!dir_buf) {
1435                 ret = -ENOMEM;
1436                 up_read(&EXT4_I(inode)->xattr_sem);
1437                 goto out;
1438         }
1439 
1440         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1441         up_read(&EXT4_I(inode)->xattr_sem);
1442         if (ret < 0)
1443                 goto out;
1444 
1445         sb = inode->i_sb;
1446         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1447         offset = ctx->pos;
1448 
1449         /*
1450          * dotdot_offset and dotdot_size is the real offset and
1451          * size for ".." and "." if the dir is block based while
1452          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1453          * So we will use extra_offset and extra_size to indicate them
1454          * during the inline dir iteration.
1455          */
1456         dotdot_offset = EXT4_DIR_REC_LEN(1);
1457         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1458         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1459         extra_size = extra_offset + inline_size;
1460 
1461         /*
1462          * If the version has changed since the last call to
1463          * readdir(2), then we might be pointing to an invalid
1464          * dirent right now.  Scan from the start of the inline
1465          * dir to make sure.
1466          */
1467         if (file->f_version != inode->i_version) {
1468                 for (i = 0; i < extra_size && i < offset;) {
1469                         /*
1470                          * "." is with offset 0 and
1471                          * ".." is dotdot_offset.
1472                          */
1473                         if (!i) {
1474                                 i = dotdot_offset;
1475                                 continue;
1476                         } else if (i == dotdot_offset) {
1477                                 i = dotdot_size;
1478                                 continue;
1479                         }
1480                         /* for other entry, the real offset in
1481                          * the buf has to be tuned accordingly.
1482                          */
1483                         de = (struct ext4_dir_entry_2 *)
1484                                 (dir_buf + i - extra_offset);
1485                         /* It's too expensive to do a full
1486                          * dirent test each time round this
1487                          * loop, but we do have to test at
1488                          * least that it is non-zero.  A
1489                          * failure will be detected in the
1490                          * dirent test below. */
1491                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1492                                 < EXT4_DIR_REC_LEN(1))
1493                                 break;
1494                         i += ext4_rec_len_from_disk(de->rec_len,
1495                                                     extra_size);
1496                 }
1497                 offset = i;
1498                 ctx->pos = offset;
1499                 file->f_version = inode->i_version;
1500         }
1501 
1502         while (ctx->pos < extra_size) {
1503                 if (ctx->pos == 0) {
1504                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1505                                 goto out;
1506                         ctx->pos = dotdot_offset;
1507                         continue;
1508                 }
1509 
1510                 if (ctx->pos == dotdot_offset) {
1511                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1512                                 goto out;
1513                         ctx->pos = dotdot_size;
1514                         continue;
1515                 }
1516 
1517                 de = (struct ext4_dir_entry_2 *)
1518                         (dir_buf + ctx->pos - extra_offset);
1519                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1520                                          extra_size, ctx->pos))
1521                         goto out;
1522                 if (le32_to_cpu(de->inode)) {
1523                         if (!dir_emit(ctx, de->name, de->name_len,
1524                                       le32_to_cpu(de->inode),
1525                                       get_dtype(sb, de->file_type)))
1526                                 goto out;
1527                 }
1528                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1529         }
1530 out:
1531         kfree(dir_buf);
1532         brelse(iloc.bh);
1533         return ret;
1534 }
1535 
1536 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1537                                         struct ext4_dir_entry_2 **parent_de,
1538                                         int *retval)
1539 {
1540         struct ext4_iloc iloc;
1541 
1542         *retval = ext4_get_inode_loc(inode, &iloc);
1543         if (*retval)
1544                 return NULL;
1545 
1546         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1547 
1548         return iloc.bh;
1549 }
1550 
1551 /*
1552  * Try to create the inline data for the new dir.
1553  * If it succeeds, return 0, otherwise return the error.
1554  * In case of ENOSPC, the caller should create the normal disk layout dir.
1555  */
1556 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1557                                struct inode *inode)
1558 {
1559         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1560         struct ext4_iloc iloc;
1561         struct ext4_dir_entry_2 *de;
1562 
1563         ret = ext4_get_inode_loc(inode, &iloc);
1564         if (ret)
1565                 return ret;
1566 
1567         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1568         if (ret)
1569                 goto out;
1570 
1571         /*
1572          * For inline dir, we only save the inode information for the ".."
1573          * and create a fake dentry to cover the left space.
1574          */
1575         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1576         de->inode = cpu_to_le32(parent->i_ino);
1577         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1578         de->inode = 0;
1579         de->rec_len = ext4_rec_len_to_disk(
1580                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1581                                 inline_size);
1582         set_nlink(inode, 2);
1583         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1584 out:
1585         brelse(iloc.bh);
1586         return ret;
1587 }
1588 
1589 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1590                                         const struct qstr *d_name,
1591                                         struct ext4_dir_entry_2 **res_dir,
1592                                         int *has_inline_data)
1593 {
1594         int ret;
1595         struct ext4_iloc iloc;
1596         void *inline_start;
1597         int inline_size;
1598 
1599         if (ext4_get_inode_loc(dir, &iloc))
1600                 return NULL;
1601 
1602         down_read(&EXT4_I(dir)->xattr_sem);
1603         if (!ext4_has_inline_data(dir)) {
1604                 *has_inline_data = 0;
1605                 goto out;
1606         }
1607 
1608         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1609                                                 EXT4_INLINE_DOTDOT_SIZE;
1610         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1611         ret = search_dir(iloc.bh, inline_start, inline_size,
1612                          dir, d_name, 0, res_dir);
1613         if (ret == 1)
1614                 goto out_find;
1615         if (ret < 0)
1616                 goto out;
1617 
1618         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1619                 goto out;
1620 
1621         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1622         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1623 
1624         ret = search_dir(iloc.bh, inline_start, inline_size,
1625                          dir, d_name, 0, res_dir);
1626         if (ret == 1)
1627                 goto out_find;
1628 
1629 out:
1630         brelse(iloc.bh);
1631         iloc.bh = NULL;
1632 out_find:
1633         up_read(&EXT4_I(dir)->xattr_sem);
1634         return iloc.bh;
1635 }
1636 
1637 int ext4_delete_inline_entry(handle_t *handle,
1638                              struct inode *dir,
1639                              struct ext4_dir_entry_2 *de_del,
1640                              struct buffer_head *bh,
1641                              int *has_inline_data)
1642 {
1643         int err, inline_size;
1644         struct ext4_iloc iloc;
1645         void *inline_start;
1646 
1647         err = ext4_get_inode_loc(dir, &iloc);
1648         if (err)
1649                 return err;
1650 
1651         down_write(&EXT4_I(dir)->xattr_sem);
1652         if (!ext4_has_inline_data(dir)) {
1653                 *has_inline_data = 0;
1654                 goto out;
1655         }
1656 
1657         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1658                 EXT4_MIN_INLINE_DATA_SIZE) {
1659                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1660                                         EXT4_INLINE_DOTDOT_SIZE;
1661                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1662                                 EXT4_INLINE_DOTDOT_SIZE;
1663         } else {
1664                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1665                 inline_size = ext4_get_inline_size(dir) -
1666                                 EXT4_MIN_INLINE_DATA_SIZE;
1667         }
1668 
1669         err = ext4_journal_get_write_access(handle, bh);
1670         if (err)
1671                 goto out;
1672 
1673         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1674                                         inline_start, inline_size, 0);
1675         if (err)
1676                 goto out;
1677 
1678         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1679         err = ext4_mark_inode_dirty(handle, dir);
1680         if (unlikely(err))
1681                 goto out;
1682 
1683         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1684 out:
1685         up_write(&EXT4_I(dir)->xattr_sem);
1686         brelse(iloc.bh);
1687         if (err != -ENOENT)
1688                 ext4_std_error(dir->i_sb, err);
1689         return err;
1690 }
1691 
1692 /*
1693  * Get the inline dentry at offset.
1694  */
1695 static inline struct ext4_dir_entry_2 *
1696 ext4_get_inline_entry(struct inode *inode,
1697                       struct ext4_iloc *iloc,
1698                       unsigned int offset,
1699                       void **inline_start,
1700                       int *inline_size)
1701 {
1702         void *inline_pos;
1703 
1704         BUG_ON(offset > ext4_get_inline_size(inode));
1705 
1706         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1707                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1708                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1709         } else {
1710                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1711                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1712                 *inline_size = ext4_get_inline_size(inode) -
1713                                 EXT4_MIN_INLINE_DATA_SIZE;
1714         }
1715 
1716         if (inline_start)
1717                 *inline_start = inline_pos;
1718         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1719 }
1720 
1721 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1722 {
1723         int err, inline_size;
1724         struct ext4_iloc iloc;
1725         void *inline_pos;
1726         unsigned int offset;
1727         struct ext4_dir_entry_2 *de;
1728         int ret = 1;
1729 
1730         err = ext4_get_inode_loc(dir, &iloc);
1731         if (err) {
1732                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1733                                  err, dir->i_ino);
1734                 return 1;
1735         }
1736 
1737         down_read(&EXT4_I(dir)->xattr_sem);
1738         if (!ext4_has_inline_data(dir)) {
1739                 *has_inline_data = 0;
1740                 goto out;
1741         }
1742 
1743         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1744         if (!le32_to_cpu(de->inode)) {
1745                 ext4_warning(dir->i_sb,
1746                              "bad inline directory (dir #%lu) - no `..'",
1747                              dir->i_ino);
1748                 ret = 1;
1749                 goto out;
1750         }
1751 
1752         offset = EXT4_INLINE_DOTDOT_SIZE;
1753         while (offset < dir->i_size) {
1754                 de = ext4_get_inline_entry(dir, &iloc, offset,
1755                                            &inline_pos, &inline_size);
1756                 if (ext4_check_dir_entry(dir, NULL, de,
1757                                          iloc.bh, inline_pos,
1758                                          inline_size, offset)) {
1759                         ext4_warning(dir->i_sb,
1760                                      "bad inline directory (dir #%lu) - "
1761                                      "inode %u, rec_len %u, name_len %d"
1762                                      "inline size %d\n",
1763                                      dir->i_ino, le32_to_cpu(de->inode),
1764                                      le16_to_cpu(de->rec_len), de->name_len,
1765                                      inline_size);
1766                         ret = 1;
1767                         goto out;
1768                 }
1769                 if (le32_to_cpu(de->inode)) {
1770                         ret = 0;
1771                         goto out;
1772                 }
1773                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1774         }
1775 
1776 out:
1777         up_read(&EXT4_I(dir)->xattr_sem);
1778         brelse(iloc.bh);
1779         return ret;
1780 }
1781 
1782 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1783 {
1784         int ret;
1785 
1786         down_write(&EXT4_I(inode)->xattr_sem);
1787         ret = ext4_destroy_inline_data_nolock(handle, inode);
1788         up_write(&EXT4_I(inode)->xattr_sem);
1789 
1790         return ret;
1791 }
1792 
1793 int ext4_inline_data_fiemap(struct inode *inode,
1794                             struct fiemap_extent_info *fieinfo,
1795                             int *has_inline)
1796 {
1797         __u64 physical = 0;
1798         __u64 length;
1799         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1800         int error = 0;
1801         struct ext4_iloc iloc;
1802 
1803         down_read(&EXT4_I(inode)->xattr_sem);
1804         if (!ext4_has_inline_data(inode)) {
1805                 *has_inline = 0;
1806                 goto out;
1807         }
1808 
1809         error = ext4_get_inode_loc(inode, &iloc);
1810         if (error)
1811                 goto out;
1812 
1813         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1814         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1815         physical += offsetof(struct ext4_inode, i_block);
1816         length = i_size_read(inode);
1817 
1818         if (physical)
1819                 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1820                                                 length, flags);
1821         brelse(iloc.bh);
1822 out:
1823         up_read(&EXT4_I(inode)->xattr_sem);
1824         return (error < 0 ? error : 0);
1825 }
1826 
1827 /*
1828  * Called during xattr set, and if we can sparse space 'needed',
1829  * just create the extent tree evict the data to the outer block.
1830  *
1831  * We use jbd2 instead of page cache to move data to the 1st block
1832  * so that the whole transaction can be committed as a whole and
1833  * the data isn't lost because of the delayed page cache write.
1834  */
1835 int ext4_try_to_evict_inline_data(handle_t *handle,
1836                                   struct inode *inode,
1837                                   int needed)
1838 {
1839         int error;
1840         struct ext4_xattr_entry *entry;
1841         struct ext4_xattr_ibody_header *header;
1842         struct ext4_inode *raw_inode;
1843         struct ext4_iloc iloc;
1844 
1845         error = ext4_get_inode_loc(inode, &iloc);
1846         if (error)
1847                 return error;
1848 
1849         raw_inode = ext4_raw_inode(&iloc);
1850         header = IHDR(inode, raw_inode);
1851         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1852                                             EXT4_I(inode)->i_inline_off);
1853         if (EXT4_XATTR_LEN(entry->e_name_len) +
1854             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1855                 error = -ENOSPC;
1856                 goto out;
1857         }
1858 
1859         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1860 out:
1861         brelse(iloc.bh);
1862         return error;
1863 }
1864 
1865 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1866 {
1867         handle_t *handle;
1868         int inline_size, value_len, needed_blocks;
1869         size_t i_size;
1870         void *value = NULL;
1871         struct ext4_xattr_ibody_find is = {
1872                 .s = { .not_found = -ENODATA, },
1873         };
1874         struct ext4_xattr_info i = {
1875                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1876                 .name = EXT4_XATTR_SYSTEM_DATA,
1877         };
1878 
1879 
1880         needed_blocks = ext4_writepage_trans_blocks(inode);
1881         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1882         if (IS_ERR(handle))
1883                 return;
1884 
1885         down_write(&EXT4_I(inode)->xattr_sem);
1886         if (!ext4_has_inline_data(inode)) {
1887                 *has_inline = 0;
1888                 ext4_journal_stop(handle);
1889                 return;
1890         }
1891 
1892         if (ext4_orphan_add(handle, inode))
1893                 goto out;
1894 
1895         if (ext4_get_inode_loc(inode, &is.iloc))
1896                 goto out;
1897 
1898         down_write(&EXT4_I(inode)->i_data_sem);
1899         i_size = inode->i_size;
1900         inline_size = ext4_get_inline_size(inode);
1901         EXT4_I(inode)->i_disksize = i_size;
1902 
1903         if (i_size < inline_size) {
1904                 /* Clear the content in the xattr space. */
1905                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1906                         if (ext4_xattr_ibody_find(inode, &i, &is))
1907                                 goto out_error;
1908 
1909                         BUG_ON(is.s.not_found);
1910 
1911                         value_len = le32_to_cpu(is.s.here->e_value_size);
1912                         value = kmalloc(value_len, GFP_NOFS);
1913                         if (!value)
1914                                 goto out_error;
1915 
1916                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1917                                                 value, value_len))
1918                                 goto out_error;
1919 
1920                         i.value = value;
1921                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1922                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1923                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1924                                 goto out_error;
1925                 }
1926 
1927                 /* Clear the content within i_blocks. */
1928                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1929                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1930                         memset(p + i_size, 0,
1931                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1932                 }
1933 
1934                 EXT4_I(inode)->i_inline_size = i_size <
1935                                         EXT4_MIN_INLINE_DATA_SIZE ?
1936                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1937         }
1938 
1939 out_error:
1940         up_write(&EXT4_I(inode)->i_data_sem);
1941 out:
1942         brelse(is.iloc.bh);
1943         up_write(&EXT4_I(inode)->xattr_sem);
1944         kfree(value);
1945         if (inode->i_nlink)
1946                 ext4_orphan_del(handle, inode);
1947 
1948         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1949         ext4_mark_inode_dirty(handle, inode);
1950         if (IS_SYNC(inode))
1951                 ext4_handle_sync(handle);
1952 
1953         ext4_journal_stop(handle);
1954         return;
1955 }
1956 
1957 int ext4_convert_inline_data(struct inode *inode)
1958 {
1959         int error, needed_blocks;
1960         handle_t *handle;
1961         struct ext4_iloc iloc;
1962 
1963         if (!ext4_has_inline_data(inode)) {
1964                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1965                 return 0;
1966         }
1967 
1968         needed_blocks = ext4_writepage_trans_blocks(inode);
1969 
1970         iloc.bh = NULL;
1971         error = ext4_get_inode_loc(inode, &iloc);
1972         if (error)
1973                 return error;
1974 
1975         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1976         if (IS_ERR(handle)) {
1977                 error = PTR_ERR(handle);
1978                 goto out_free;
1979         }
1980 
1981         down_write(&EXT4_I(inode)->xattr_sem);
1982         if (!ext4_has_inline_data(inode)) {
1983                 up_write(&EXT4_I(inode)->xattr_sem);
1984                 goto out;
1985         }
1986 
1987         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1988         up_write(&EXT4_I(inode)->xattr_sem);
1989 out:
1990         ext4_journal_stop(handle);
1991 out_free:
1992         brelse(iloc.bh);
1993         return error;
1994 }
1995 

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