xref: /openbmc/linux/fs/ext4/inline.c (revision ae3473231e77a3f1909d48cd144cebe5e1d049b3)
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 
15 #include <linux/fiemap.h>
16 
17 #include "ext4_jbd2.h"
18 #include "ext4.h"
19 #include "xattr.h"
20 #include "truncate.h"
21 
22 #define EXT4_XATTR_SYSTEM_DATA	"data"
23 #define EXT4_MIN_INLINE_DATA_SIZE	((sizeof(__le32) * EXT4_N_BLOCKS))
24 #define EXT4_INLINE_DOTDOT_OFFSET	2
25 #define EXT4_INLINE_DOTDOT_SIZE		4
26 
27 static int ext4_get_inline_size(struct inode *inode)
28 {
29 	if (EXT4_I(inode)->i_inline_off)
30 		return EXT4_I(inode)->i_inline_size;
31 
32 	return 0;
33 }
34 
35 static int get_max_inline_xattr_value_size(struct inode *inode,
36 					   struct ext4_iloc *iloc)
37 {
38 	struct ext4_xattr_ibody_header *header;
39 	struct ext4_xattr_entry *entry;
40 	struct ext4_inode *raw_inode;
41 	int free, min_offs;
42 
43 	min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
44 			EXT4_GOOD_OLD_INODE_SIZE -
45 			EXT4_I(inode)->i_extra_isize -
46 			sizeof(struct ext4_xattr_ibody_header);
47 
48 	/*
49 	 * We need to subtract another sizeof(__u32) since an in-inode xattr
50 	 * needs an empty 4 bytes to indicate the gap between the xattr entry
51 	 * and the name/value pair.
52 	 */
53 	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
54 		return EXT4_XATTR_SIZE(min_offs -
55 			EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
56 			EXT4_XATTR_ROUND - sizeof(__u32));
57 
58 	raw_inode = ext4_raw_inode(iloc);
59 	header = IHDR(inode, raw_inode);
60 	entry = IFIRST(header);
61 
62 	/* Compute min_offs. */
63 	for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
64 		if (!entry->e_value_block && entry->e_value_size) {
65 			size_t offs = le16_to_cpu(entry->e_value_offs);
66 			if (offs < min_offs)
67 				min_offs = offs;
68 		}
69 	}
70 	free = min_offs -
71 		((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
72 
73 	if (EXT4_I(inode)->i_inline_off) {
74 		entry = (struct ext4_xattr_entry *)
75 			((void *)raw_inode + EXT4_I(inode)->i_inline_off);
76 
77 		free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
78 		goto out;
79 	}
80 
81 	free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
82 
83 	if (free > EXT4_XATTR_ROUND)
84 		free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
85 	else
86 		free = 0;
87 
88 out:
89 	return free;
90 }
91 
92 /*
93  * Get the maximum size we now can store in an inode.
94  * If we can't find the space for a xattr entry, don't use the space
95  * of the extents since we have no space to indicate the inline data.
96  */
97 int ext4_get_max_inline_size(struct inode *inode)
98 {
99 	int error, max_inline_size;
100 	struct ext4_iloc iloc;
101 
102 	if (EXT4_I(inode)->i_extra_isize == 0)
103 		return 0;
104 
105 	error = ext4_get_inode_loc(inode, &iloc);
106 	if (error) {
107 		ext4_error_inode(inode, __func__, __LINE__, 0,
108 				 "can't get inode location %lu",
109 				 inode->i_ino);
110 		return 0;
111 	}
112 
113 	down_read(&EXT4_I(inode)->xattr_sem);
114 	max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
115 	up_read(&EXT4_I(inode)->xattr_sem);
116 
117 	brelse(iloc.bh);
118 
119 	if (!max_inline_size)
120 		return 0;
121 
122 	return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
123 }
124 
125 /*
126  * this function does not take xattr_sem, which is OK because it is
127  * currently only used in a code path coming form ext4_iget, before
128  * the new inode has been unlocked
129  */
130 int ext4_find_inline_data_nolock(struct inode *inode)
131 {
132 	struct ext4_xattr_ibody_find is = {
133 		.s = { .not_found = -ENODATA, },
134 	};
135 	struct ext4_xattr_info i = {
136 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
137 		.name = EXT4_XATTR_SYSTEM_DATA,
138 	};
139 	int error;
140 
141 	if (EXT4_I(inode)->i_extra_isize == 0)
142 		return 0;
143 
144 	error = ext4_get_inode_loc(inode, &is.iloc);
145 	if (error)
146 		return error;
147 
148 	error = ext4_xattr_ibody_find(inode, &i, &is);
149 	if (error)
150 		goto out;
151 
152 	if (!is.s.not_found) {
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 	BUG_ON(!EXT4_I(inode)->i_inline_off);
219 	BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
220 
221 	raw_inode = ext4_raw_inode(iloc);
222 	buffer += pos;
223 
224 	if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
225 		cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
226 			 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
227 		memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
228 
229 		len -= cp_len;
230 		buffer += cp_len;
231 		pos += cp_len;
232 	}
233 
234 	if (!len)
235 		return;
236 
237 	pos -= EXT4_MIN_INLINE_DATA_SIZE;
238 	header = IHDR(inode, raw_inode);
239 	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
240 					    EXT4_I(inode)->i_inline_off);
241 
242 	memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
243 	       buffer, len);
244 }
245 
246 static int ext4_create_inline_data(handle_t *handle,
247 				   struct inode *inode, unsigned len)
248 {
249 	int error;
250 	void *value = NULL;
251 	struct ext4_xattr_ibody_find is = {
252 		.s = { .not_found = -ENODATA, },
253 	};
254 	struct ext4_xattr_info i = {
255 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
256 		.name = EXT4_XATTR_SYSTEM_DATA,
257 	};
258 
259 	error = ext4_get_inode_loc(inode, &is.iloc);
260 	if (error)
261 		return error;
262 
263 	BUFFER_TRACE(is.iloc.bh, "get_write_access");
264 	error = ext4_journal_get_write_access(handle, is.iloc.bh);
265 	if (error)
266 		goto out;
267 
268 	if (len > EXT4_MIN_INLINE_DATA_SIZE) {
269 		value = EXT4_ZERO_XATTR_VALUE;
270 		len -= EXT4_MIN_INLINE_DATA_SIZE;
271 	} else {
272 		value = "";
273 		len = 0;
274 	}
275 
276 	/* Insert the the xttr entry. */
277 	i.value = value;
278 	i.value_len = len;
279 
280 	error = ext4_xattr_ibody_find(inode, &i, &is);
281 	if (error)
282 		goto out;
283 
284 	BUG_ON(!is.s.not_found);
285 
286 	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
287 	if (error) {
288 		if (error == -ENOSPC)
289 			ext4_clear_inode_state(inode,
290 					       EXT4_STATE_MAY_INLINE_DATA);
291 		goto out;
292 	}
293 
294 	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
295 		0, EXT4_MIN_INLINE_DATA_SIZE);
296 
297 	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
298 				      (void *)ext4_raw_inode(&is.iloc));
299 	EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
300 	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
301 	ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
302 	/*
303 	 * Propagate changes to inode->i_flags as well - e.g. S_DAX may
304 	 * get cleared
305 	 */
306 	ext4_set_inode_flags(inode);
307 	get_bh(is.iloc.bh);
308 	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
309 
310 out:
311 	brelse(is.iloc.bh);
312 	return error;
313 }
314 
315 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
316 				   unsigned int len)
317 {
318 	int error;
319 	void *value = NULL;
320 	struct ext4_xattr_ibody_find is = {
321 		.s = { .not_found = -ENODATA, },
322 	};
323 	struct ext4_xattr_info i = {
324 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
325 		.name = EXT4_XATTR_SYSTEM_DATA,
326 	};
327 
328 	/* If the old space is ok, write the data directly. */
329 	if (len <= EXT4_I(inode)->i_inline_size)
330 		return 0;
331 
332 	error = ext4_get_inode_loc(inode, &is.iloc);
333 	if (error)
334 		return error;
335 
336 	error = ext4_xattr_ibody_find(inode, &i, &is);
337 	if (error)
338 		goto out;
339 
340 	BUG_ON(is.s.not_found);
341 
342 	len -= EXT4_MIN_INLINE_DATA_SIZE;
343 	value = kzalloc(len, GFP_NOFS);
344 	if (!value) {
345 		error = -ENOMEM;
346 		goto out;
347 	}
348 
349 	error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
350 				     value, len);
351 	if (error == -ENODATA)
352 		goto out;
353 
354 	BUFFER_TRACE(is.iloc.bh, "get_write_access");
355 	error = ext4_journal_get_write_access(handle, is.iloc.bh);
356 	if (error)
357 		goto out;
358 
359 	/* Update the xttr entry. */
360 	i.value = value;
361 	i.value_len = len;
362 
363 	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
364 	if (error)
365 		goto out;
366 
367 	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
368 				      (void *)ext4_raw_inode(&is.iloc));
369 	EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
370 				le32_to_cpu(is.s.here->e_value_size);
371 	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
372 	get_bh(is.iloc.bh);
373 	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
374 
375 out:
376 	kfree(value);
377 	brelse(is.iloc.bh);
378 	return error;
379 }
380 
381 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
382 				    unsigned int len)
383 {
384 	int ret, size;
385 	struct ext4_inode_info *ei = EXT4_I(inode);
386 
387 	if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
388 		return -ENOSPC;
389 
390 	size = ext4_get_max_inline_size(inode);
391 	if (size < len)
392 		return -ENOSPC;
393 
394 	down_write(&EXT4_I(inode)->xattr_sem);
395 
396 	if (ei->i_inline_off)
397 		ret = ext4_update_inline_data(handle, inode, len);
398 	else
399 		ret = ext4_create_inline_data(handle, inode, len);
400 
401 	up_write(&EXT4_I(inode)->xattr_sem);
402 
403 	return ret;
404 }
405 
406 static int ext4_destroy_inline_data_nolock(handle_t *handle,
407 					   struct inode *inode)
408 {
409 	struct ext4_inode_info *ei = EXT4_I(inode);
410 	struct ext4_xattr_ibody_find is = {
411 		.s = { .not_found = 0, },
412 	};
413 	struct ext4_xattr_info i = {
414 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
415 		.name = EXT4_XATTR_SYSTEM_DATA,
416 		.value = NULL,
417 		.value_len = 0,
418 	};
419 	int error;
420 
421 	if (!ei->i_inline_off)
422 		return 0;
423 
424 	error = ext4_get_inode_loc(inode, &is.iloc);
425 	if (error)
426 		return error;
427 
428 	error = ext4_xattr_ibody_find(inode, &i, &is);
429 	if (error)
430 		goto out;
431 
432 	BUFFER_TRACE(is.iloc.bh, "get_write_access");
433 	error = ext4_journal_get_write_access(handle, is.iloc.bh);
434 	if (error)
435 		goto out;
436 
437 	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
438 	if (error)
439 		goto out;
440 
441 	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
442 		0, EXT4_MIN_INLINE_DATA_SIZE);
443 
444 	if (ext4_has_feature_extents(inode->i_sb)) {
445 		if (S_ISDIR(inode->i_mode) ||
446 		    S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
447 			ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
448 			ext4_ext_tree_init(handle, inode);
449 		}
450 	}
451 	ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
452 	/*
453 	 * Propagate changes to inode->i_flags as well - e.g. S_DAX may
454 	 * get set.
455 	 */
456 	ext4_set_inode_flags(inode);
457 
458 	get_bh(is.iloc.bh);
459 	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
460 
461 	EXT4_I(inode)->i_inline_off = 0;
462 	EXT4_I(inode)->i_inline_size = 0;
463 	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
464 out:
465 	brelse(is.iloc.bh);
466 	if (error == -ENODATA)
467 		error = 0;
468 	return error;
469 }
470 
471 static int ext4_read_inline_page(struct inode *inode, struct page *page)
472 {
473 	void *kaddr;
474 	int ret = 0;
475 	size_t len;
476 	struct ext4_iloc iloc;
477 
478 	BUG_ON(!PageLocked(page));
479 	BUG_ON(!ext4_has_inline_data(inode));
480 	BUG_ON(page->index);
481 
482 	if (!EXT4_I(inode)->i_inline_off) {
483 		ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
484 			     inode->i_ino);
485 		goto out;
486 	}
487 
488 	ret = ext4_get_inode_loc(inode, &iloc);
489 	if (ret)
490 		goto out;
491 
492 	len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
493 	kaddr = kmap_atomic(page);
494 	ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
495 	flush_dcache_page(page);
496 	kunmap_atomic(kaddr);
497 	zero_user_segment(page, len, PAGE_SIZE);
498 	SetPageUptodate(page);
499 	brelse(iloc.bh);
500 
501 out:
502 	return ret;
503 }
504 
505 int ext4_readpage_inline(struct inode *inode, struct page *page)
506 {
507 	int ret = 0;
508 
509 	down_read(&EXT4_I(inode)->xattr_sem);
510 	if (!ext4_has_inline_data(inode)) {
511 		up_read(&EXT4_I(inode)->xattr_sem);
512 		return -EAGAIN;
513 	}
514 
515 	/*
516 	 * Current inline data can only exist in the 1st page,
517 	 * So for all the other pages, just set them uptodate.
518 	 */
519 	if (!page->index)
520 		ret = ext4_read_inline_page(inode, page);
521 	else if (!PageUptodate(page)) {
522 		zero_user_segment(page, 0, PAGE_SIZE);
523 		SetPageUptodate(page);
524 	}
525 
526 	up_read(&EXT4_I(inode)->xattr_sem);
527 
528 	unlock_page(page);
529 	return ret >= 0 ? 0 : ret;
530 }
531 
532 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
533 					      struct inode *inode,
534 					      unsigned flags)
535 {
536 	int ret, needed_blocks;
537 	handle_t *handle = NULL;
538 	int retries = 0, sem_held = 0;
539 	struct page *page = NULL;
540 	unsigned from, to;
541 	struct ext4_iloc iloc;
542 
543 	if (!ext4_has_inline_data(inode)) {
544 		/*
545 		 * clear the flag so that no new write
546 		 * will trap here again.
547 		 */
548 		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
549 		return 0;
550 	}
551 
552 	needed_blocks = ext4_writepage_trans_blocks(inode);
553 
554 	ret = ext4_get_inode_loc(inode, &iloc);
555 	if (ret)
556 		return ret;
557 
558 retry:
559 	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
560 	if (IS_ERR(handle)) {
561 		ret = PTR_ERR(handle);
562 		handle = NULL;
563 		goto out;
564 	}
565 
566 	/* We cannot recurse into the filesystem as the transaction is already
567 	 * started */
568 	flags |= AOP_FLAG_NOFS;
569 
570 	page = grab_cache_page_write_begin(mapping, 0, flags);
571 	if (!page) {
572 		ret = -ENOMEM;
573 		goto out;
574 	}
575 
576 	down_write(&EXT4_I(inode)->xattr_sem);
577 	sem_held = 1;
578 	/* If some one has already done this for us, just exit. */
579 	if (!ext4_has_inline_data(inode)) {
580 		ret = 0;
581 		goto out;
582 	}
583 
584 	from = 0;
585 	to = ext4_get_inline_size(inode);
586 	if (!PageUptodate(page)) {
587 		ret = ext4_read_inline_page(inode, page);
588 		if (ret < 0)
589 			goto out;
590 	}
591 
592 	ret = ext4_destroy_inline_data_nolock(handle, inode);
593 	if (ret)
594 		goto out;
595 
596 	if (ext4_should_dioread_nolock(inode)) {
597 		ret = __block_write_begin(page, from, to,
598 					  ext4_get_block_unwritten);
599 	} else
600 		ret = __block_write_begin(page, from, to, ext4_get_block);
601 
602 	if (!ret && ext4_should_journal_data(inode)) {
603 		ret = ext4_walk_page_buffers(handle, page_buffers(page),
604 					     from, to, NULL,
605 					     do_journal_get_write_access);
606 	}
607 
608 	if (ret) {
609 		unlock_page(page);
610 		put_page(page);
611 		page = NULL;
612 		ext4_orphan_add(handle, inode);
613 		up_write(&EXT4_I(inode)->xattr_sem);
614 		sem_held = 0;
615 		ext4_journal_stop(handle);
616 		handle = NULL;
617 		ext4_truncate_failed_write(inode);
618 		/*
619 		 * If truncate failed early the inode might
620 		 * still be on the orphan list; we need to
621 		 * make sure the inode is removed from the
622 		 * orphan list in that case.
623 		 */
624 		if (inode->i_nlink)
625 			ext4_orphan_del(NULL, inode);
626 	}
627 
628 	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
629 		goto retry;
630 
631 	if (page)
632 		block_commit_write(page, from, to);
633 out:
634 	if (page) {
635 		unlock_page(page);
636 		put_page(page);
637 	}
638 	if (sem_held)
639 		up_write(&EXT4_I(inode)->xattr_sem);
640 	if (handle)
641 		ext4_journal_stop(handle);
642 	brelse(iloc.bh);
643 	return ret;
644 }
645 
646 /*
647  * Try to write data in the inode.
648  * If the inode has inline data, check whether the new write can be
649  * in the inode also. If not, create the page the handle, move the data
650  * to the page make it update and let the later codes create extent for it.
651  */
652 int ext4_try_to_write_inline_data(struct address_space *mapping,
653 				  struct inode *inode,
654 				  loff_t pos, unsigned len,
655 				  unsigned flags,
656 				  struct page **pagep)
657 {
658 	int ret;
659 	handle_t *handle;
660 	struct page *page;
661 	struct ext4_iloc iloc;
662 
663 	if (pos + len > ext4_get_max_inline_size(inode))
664 		goto convert;
665 
666 	ret = ext4_get_inode_loc(inode, &iloc);
667 	if (ret)
668 		return ret;
669 
670 	/*
671 	 * The possible write could happen in the inode,
672 	 * so try to reserve the space in inode first.
673 	 */
674 	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
675 	if (IS_ERR(handle)) {
676 		ret = PTR_ERR(handle);
677 		handle = NULL;
678 		goto out;
679 	}
680 
681 	ret = ext4_prepare_inline_data(handle, inode, pos + len);
682 	if (ret && ret != -ENOSPC)
683 		goto out;
684 
685 	/* We don't have space in inline inode, so convert it to extent. */
686 	if (ret == -ENOSPC) {
687 		ext4_journal_stop(handle);
688 		brelse(iloc.bh);
689 		goto convert;
690 	}
691 
692 	flags |= AOP_FLAG_NOFS;
693 
694 	page = grab_cache_page_write_begin(mapping, 0, flags);
695 	if (!page) {
696 		ret = -ENOMEM;
697 		goto out;
698 	}
699 
700 	*pagep = page;
701 	down_read(&EXT4_I(inode)->xattr_sem);
702 	if (!ext4_has_inline_data(inode)) {
703 		ret = 0;
704 		unlock_page(page);
705 		put_page(page);
706 		goto out_up_read;
707 	}
708 
709 	if (!PageUptodate(page)) {
710 		ret = ext4_read_inline_page(inode, page);
711 		if (ret < 0)
712 			goto out_up_read;
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)
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;
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 	down_write(&EXT4_I(inode)->xattr_sem);
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 	up_write(&EXT4_I(inode)->xattr_sem);
761 	brelse(iloc.bh);
762 out:
763 	return copied;
764 }
765 
766 struct buffer_head *
767 ext4_journalled_write_inline_data(struct inode *inode,
768 				  unsigned len,
769 				  struct page *page)
770 {
771 	int ret;
772 	void *kaddr;
773 	struct ext4_iloc iloc;
774 
775 	ret = ext4_get_inode_loc(inode, &iloc);
776 	if (ret) {
777 		ext4_std_error(inode->i_sb, ret);
778 		return NULL;
779 	}
780 
781 	down_write(&EXT4_I(inode)->xattr_sem);
782 	kaddr = kmap_atomic(page);
783 	ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
784 	kunmap_atomic(kaddr);
785 	up_write(&EXT4_I(inode)->xattr_sem);
786 
787 	return iloc.bh;
788 }
789 
790 /*
791  * Try to make the page cache and handle ready for the inline data case.
792  * We can call this function in 2 cases:
793  * 1. The inode is created and the first write exceeds inline size. We can
794  *    clear the inode state safely.
795  * 2. The inode has inline data, then we need to read the data, make it
796  *    update and dirty so that ext4_da_writepages can handle it. We don't
797  *    need to start the journal since the file's metatdata isn't changed now.
798  */
799 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
800 						 struct inode *inode,
801 						 unsigned flags,
802 						 void **fsdata)
803 {
804 	int ret = 0, inline_size;
805 	struct page *page;
806 
807 	page = grab_cache_page_write_begin(mapping, 0, flags);
808 	if (!page)
809 		return -ENOMEM;
810 
811 	down_read(&EXT4_I(inode)->xattr_sem);
812 	if (!ext4_has_inline_data(inode)) {
813 		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
814 		goto out;
815 	}
816 
817 	inline_size = ext4_get_inline_size(inode);
818 
819 	if (!PageUptodate(page)) {
820 		ret = ext4_read_inline_page(inode, page);
821 		if (ret < 0)
822 			goto out;
823 	}
824 
825 	ret = __block_write_begin(page, 0, inline_size,
826 				  ext4_da_get_block_prep);
827 	if (ret) {
828 		up_read(&EXT4_I(inode)->xattr_sem);
829 		unlock_page(page);
830 		put_page(page);
831 		ext4_truncate_failed_write(inode);
832 		return ret;
833 	}
834 
835 	SetPageDirty(page);
836 	SetPageUptodate(page);
837 	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
838 	*fsdata = (void *)CONVERT_INLINE_DATA;
839 
840 out:
841 	up_read(&EXT4_I(inode)->xattr_sem);
842 	if (page) {
843 		unlock_page(page);
844 		put_page(page);
845 	}
846 	return ret;
847 }
848 
849 /*
850  * Prepare the write for the inline data.
851  * If the the data can be written into the inode, we just read
852  * the page and make it uptodate, and start the journal.
853  * Otherwise read the page, makes it dirty so that it can be
854  * handle in writepages(the i_disksize update is left to the
855  * normal ext4_da_write_end).
856  */
857 int ext4_da_write_inline_data_begin(struct address_space *mapping,
858 				    struct inode *inode,
859 				    loff_t pos, unsigned len,
860 				    unsigned flags,
861 				    struct page **pagep,
862 				    void **fsdata)
863 {
864 	int ret, inline_size;
865 	handle_t *handle;
866 	struct page *page;
867 	struct ext4_iloc iloc;
868 	int retries;
869 
870 	ret = ext4_get_inode_loc(inode, &iloc);
871 	if (ret)
872 		return ret;
873 
874 retry_journal:
875 	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
876 	if (IS_ERR(handle)) {
877 		ret = PTR_ERR(handle);
878 		goto out;
879 	}
880 
881 	inline_size = ext4_get_max_inline_size(inode);
882 
883 	ret = -ENOSPC;
884 	if (inline_size >= pos + len) {
885 		ret = ext4_prepare_inline_data(handle, inode, pos + len);
886 		if (ret && ret != -ENOSPC)
887 			goto out_journal;
888 	}
889 
890 	/*
891 	 * We cannot recurse into the filesystem as the transaction
892 	 * is already started.
893 	 */
894 	flags |= AOP_FLAG_NOFS;
895 
896 	if (ret == -ENOSPC) {
897 		ret = ext4_da_convert_inline_data_to_extent(mapping,
898 							    inode,
899 							    flags,
900 							    fsdata);
901 		ext4_journal_stop(handle);
902 		if (ret == -ENOSPC &&
903 		    ext4_should_retry_alloc(inode->i_sb, &retries))
904 			goto retry_journal;
905 		goto out;
906 	}
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 
927 	up_read(&EXT4_I(inode)->xattr_sem);
928 	*pagep = page;
929 	brelse(iloc.bh);
930 	return 1;
931 out_release_page:
932 	up_read(&EXT4_I(inode)->xattr_sem);
933 	unlock_page(page);
934 	put_page(page);
935 out_journal:
936 	ext4_journal_stop(handle);
937 out:
938 	brelse(iloc.bh);
939 	return ret;
940 }
941 
942 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
943 				  unsigned len, unsigned copied,
944 				  struct page *page)
945 {
946 	int i_size_changed = 0;
947 
948 	copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
949 
950 	/*
951 	 * No need to use i_size_read() here, the i_size
952 	 * cannot change under us because we hold i_mutex.
953 	 *
954 	 * But it's important to update i_size while still holding page lock:
955 	 * page writeout could otherwise come in and zero beyond i_size.
956 	 */
957 	if (pos+copied > inode->i_size) {
958 		i_size_write(inode, pos+copied);
959 		i_size_changed = 1;
960 	}
961 	unlock_page(page);
962 	put_page(page);
963 
964 	/*
965 	 * Don't mark the inode dirty under page lock. First, it unnecessarily
966 	 * makes the holding time of page lock longer. Second, it forces lock
967 	 * ordering of page lock and transaction start for journaling
968 	 * filesystems.
969 	 */
970 	if (i_size_changed)
971 		mark_inode_dirty(inode);
972 
973 	return copied;
974 }
975 
976 #ifdef INLINE_DIR_DEBUG
977 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
978 			  void *inline_start, int inline_size)
979 {
980 	int offset;
981 	unsigned short de_len;
982 	struct ext4_dir_entry_2 *de = inline_start;
983 	void *dlimit = inline_start + inline_size;
984 
985 	trace_printk("inode %lu\n", dir->i_ino);
986 	offset = 0;
987 	while ((void *)de < dlimit) {
988 		de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
989 		trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
990 			     offset, de_len, de->name_len, de->name,
991 			     de->name_len, le32_to_cpu(de->inode));
992 		if (ext4_check_dir_entry(dir, NULL, de, bh,
993 					 inline_start, inline_size, offset))
994 			BUG();
995 
996 		offset += de_len;
997 		de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
998 	}
999 }
1000 #else
1001 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1002 #endif
1003 
1004 /*
1005  * Add a new entry into a inline dir.
1006  * It will return -ENOSPC if no space is available, and -EIO
1007  * and -EEXIST if directory entry already exists.
1008  */
1009 static int ext4_add_dirent_to_inline(handle_t *handle,
1010 				     struct ext4_filename *fname,
1011 				     struct inode *dir,
1012 				     struct inode *inode,
1013 				     struct ext4_iloc *iloc,
1014 				     void *inline_start, int inline_size)
1015 {
1016 	int		err;
1017 	struct ext4_dir_entry_2 *de;
1018 
1019 	err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1020 				inline_size, fname, &de);
1021 	if (err)
1022 		return err;
1023 
1024 	BUFFER_TRACE(iloc->bh, "get_write_access");
1025 	err = ext4_journal_get_write_access(handle, iloc->bh);
1026 	if (err)
1027 		return err;
1028 	ext4_insert_dentry(dir, inode, de, inline_size, fname);
1029 
1030 	ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1031 
1032 	/*
1033 	 * XXX shouldn't update any times until successful
1034 	 * completion of syscall, but too many callers depend
1035 	 * on this.
1036 	 *
1037 	 * XXX similarly, too many callers depend on
1038 	 * ext4_new_inode() setting the times, but error
1039 	 * recovery deletes the inode, so the worst that can
1040 	 * happen is that the times are slightly out of date
1041 	 * and/or different from the directory change time.
1042 	 */
1043 	dir->i_mtime = dir->i_ctime = current_time(dir);
1044 	ext4_update_dx_flag(dir);
1045 	dir->i_version++;
1046 	ext4_mark_inode_dirty(handle, dir);
1047 	return 1;
1048 }
1049 
1050 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1051 				       struct ext4_iloc *iloc)
1052 {
1053 	struct ext4_xattr_entry *entry;
1054 	struct ext4_xattr_ibody_header *header;
1055 
1056 	BUG_ON(!EXT4_I(inode)->i_inline_off);
1057 
1058 	header = IHDR(inode, ext4_raw_inode(iloc));
1059 	entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1060 					    EXT4_I(inode)->i_inline_off);
1061 
1062 	return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1063 }
1064 
1065 /* Set the final de to cover the whole block. */
1066 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1067 {
1068 	struct ext4_dir_entry_2 *de, *prev_de;
1069 	void *limit;
1070 	int de_len;
1071 
1072 	de = (struct ext4_dir_entry_2 *)de_buf;
1073 	if (old_size) {
1074 		limit = de_buf + old_size;
1075 		do {
1076 			prev_de = de;
1077 			de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1078 			de_buf += de_len;
1079 			de = (struct ext4_dir_entry_2 *)de_buf;
1080 		} while (de_buf < limit);
1081 
1082 		prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1083 							old_size, new_size);
1084 	} else {
1085 		/* this is just created, so create an empty entry. */
1086 		de->inode = 0;
1087 		de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1088 	}
1089 }
1090 
1091 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1092 				  struct ext4_iloc *iloc)
1093 {
1094 	int ret;
1095 	int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1096 	int new_size = get_max_inline_xattr_value_size(dir, iloc);
1097 
1098 	if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1099 		return -ENOSPC;
1100 
1101 	ret = ext4_update_inline_data(handle, dir,
1102 				      new_size + EXT4_MIN_INLINE_DATA_SIZE);
1103 	if (ret)
1104 		return ret;
1105 
1106 	ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1107 			     EXT4_I(dir)->i_inline_size -
1108 						EXT4_MIN_INLINE_DATA_SIZE);
1109 	dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1110 	return 0;
1111 }
1112 
1113 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1114 				     struct ext4_iloc *iloc,
1115 				     void *buf, int inline_size)
1116 {
1117 	ext4_create_inline_data(handle, inode, inline_size);
1118 	ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1119 	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1120 }
1121 
1122 static int ext4_finish_convert_inline_dir(handle_t *handle,
1123 					  struct inode *inode,
1124 					  struct buffer_head *dir_block,
1125 					  void *buf,
1126 					  int inline_size)
1127 {
1128 	int err, csum_size = 0, header_size = 0;
1129 	struct ext4_dir_entry_2 *de;
1130 	struct ext4_dir_entry_tail *t;
1131 	void *target = dir_block->b_data;
1132 
1133 	/*
1134 	 * First create "." and ".." and then copy the dir information
1135 	 * back to the block.
1136 	 */
1137 	de = (struct ext4_dir_entry_2 *)target;
1138 	de = ext4_init_dot_dotdot(inode, de,
1139 		inode->i_sb->s_blocksize, csum_size,
1140 		le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1141 	header_size = (void *)de - target;
1142 
1143 	memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1144 		inline_size - EXT4_INLINE_DOTDOT_SIZE);
1145 
1146 	if (ext4_has_metadata_csum(inode->i_sb))
1147 		csum_size = sizeof(struct ext4_dir_entry_tail);
1148 
1149 	inode->i_size = inode->i_sb->s_blocksize;
1150 	i_size_write(inode, inode->i_sb->s_blocksize);
1151 	EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1152 	ext4_update_final_de(dir_block->b_data,
1153 			inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1154 			inode->i_sb->s_blocksize - csum_size);
1155 
1156 	if (csum_size) {
1157 		t = EXT4_DIRENT_TAIL(dir_block->b_data,
1158 				     inode->i_sb->s_blocksize);
1159 		initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1160 	}
1161 	set_buffer_uptodate(dir_block);
1162 	err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1163 	if (err)
1164 		goto out;
1165 	set_buffer_verified(dir_block);
1166 out:
1167 	return err;
1168 }
1169 
1170 static int ext4_convert_inline_data_nolock(handle_t *handle,
1171 					   struct inode *inode,
1172 					   struct ext4_iloc *iloc)
1173 {
1174 	int error;
1175 	void *buf = NULL;
1176 	struct buffer_head *data_bh = NULL;
1177 	struct ext4_map_blocks map;
1178 	int inline_size;
1179 
1180 	inline_size = ext4_get_inline_size(inode);
1181 	buf = kmalloc(inline_size, GFP_NOFS);
1182 	if (!buf) {
1183 		error = -ENOMEM;
1184 		goto out;
1185 	}
1186 
1187 	error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1188 	if (error < 0)
1189 		goto out;
1190 
1191 	/*
1192 	 * Make sure the inline directory entries pass checks before we try to
1193 	 * convert them, so that we avoid touching stuff that needs fsck.
1194 	 */
1195 	if (S_ISDIR(inode->i_mode)) {
1196 		error = ext4_check_all_de(inode, iloc->bh,
1197 					buf + EXT4_INLINE_DOTDOT_SIZE,
1198 					inline_size - EXT4_INLINE_DOTDOT_SIZE);
1199 		if (error)
1200 			goto out;
1201 	}
1202 
1203 	error = ext4_destroy_inline_data_nolock(handle, inode);
1204 	if (error)
1205 		goto out;
1206 
1207 	map.m_lblk = 0;
1208 	map.m_len = 1;
1209 	map.m_flags = 0;
1210 	error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1211 	if (error < 0)
1212 		goto out_restore;
1213 	if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1214 		error = -EIO;
1215 		goto out_restore;
1216 	}
1217 
1218 	data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1219 	if (!data_bh) {
1220 		error = -ENOMEM;
1221 		goto out_restore;
1222 	}
1223 
1224 	lock_buffer(data_bh);
1225 	error = ext4_journal_get_create_access(handle, data_bh);
1226 	if (error) {
1227 		unlock_buffer(data_bh);
1228 		error = -EIO;
1229 		goto out_restore;
1230 	}
1231 	memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1232 
1233 	if (!S_ISDIR(inode->i_mode)) {
1234 		memcpy(data_bh->b_data, buf, inline_size);
1235 		set_buffer_uptodate(data_bh);
1236 		error = ext4_handle_dirty_metadata(handle,
1237 						   inode, data_bh);
1238 	} else {
1239 		error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1240 						       buf, inline_size);
1241 	}
1242 
1243 	unlock_buffer(data_bh);
1244 out_restore:
1245 	if (error)
1246 		ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1247 
1248 out:
1249 	brelse(data_bh);
1250 	kfree(buf);
1251 	return error;
1252 }
1253 
1254 /*
1255  * Try to add the new entry to the inline data.
1256  * If succeeds, return 0. If not, extended the inline dir and copied data to
1257  * the new created block.
1258  */
1259 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1260 			      struct inode *dir, struct inode *inode)
1261 {
1262 	int ret, inline_size;
1263 	void *inline_start;
1264 	struct ext4_iloc iloc;
1265 
1266 	ret = ext4_get_inode_loc(dir, &iloc);
1267 	if (ret)
1268 		return ret;
1269 
1270 	down_write(&EXT4_I(dir)->xattr_sem);
1271 	if (!ext4_has_inline_data(dir))
1272 		goto out;
1273 
1274 	inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1275 						 EXT4_INLINE_DOTDOT_SIZE;
1276 	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1277 
1278 	ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1279 					inline_start, inline_size);
1280 	if (ret != -ENOSPC)
1281 		goto out;
1282 
1283 	/* check whether it can be inserted to inline xattr space. */
1284 	inline_size = EXT4_I(dir)->i_inline_size -
1285 			EXT4_MIN_INLINE_DATA_SIZE;
1286 	if (!inline_size) {
1287 		/* Try to use the xattr space.*/
1288 		ret = ext4_update_inline_dir(handle, dir, &iloc);
1289 		if (ret && ret != -ENOSPC)
1290 			goto out;
1291 
1292 		inline_size = EXT4_I(dir)->i_inline_size -
1293 				EXT4_MIN_INLINE_DATA_SIZE;
1294 	}
1295 
1296 	if (inline_size) {
1297 		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1298 
1299 		ret = ext4_add_dirent_to_inline(handle, fname, dir,
1300 						inode, &iloc, inline_start,
1301 						inline_size);
1302 
1303 		if (ret != -ENOSPC)
1304 			goto out;
1305 	}
1306 
1307 	/*
1308 	 * The inline space is filled up, so create a new block for it.
1309 	 * As the extent tree will be created, we have to save the inline
1310 	 * dir first.
1311 	 */
1312 	ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1313 
1314 out:
1315 	ext4_mark_inode_dirty(handle, dir);
1316 	up_write(&EXT4_I(dir)->xattr_sem);
1317 	brelse(iloc.bh);
1318 	return ret;
1319 }
1320 
1321 /*
1322  * This function fills a red-black tree with information from an
1323  * inlined dir.  It returns the number directory entries loaded
1324  * into the tree.  If there is an error it is returned in err.
1325  */
1326 int htree_inlinedir_to_tree(struct file *dir_file,
1327 			    struct inode *dir, ext4_lblk_t block,
1328 			    struct dx_hash_info *hinfo,
1329 			    __u32 start_hash, __u32 start_minor_hash,
1330 			    int *has_inline_data)
1331 {
1332 	int err = 0, count = 0;
1333 	unsigned int parent_ino;
1334 	int pos;
1335 	struct ext4_dir_entry_2 *de;
1336 	struct inode *inode = file_inode(dir_file);
1337 	int ret, inline_size = 0;
1338 	struct ext4_iloc iloc;
1339 	void *dir_buf = NULL;
1340 	struct ext4_dir_entry_2 fake;
1341 	struct fscrypt_str tmp_str;
1342 
1343 	ret = ext4_get_inode_loc(inode, &iloc);
1344 	if (ret)
1345 		return ret;
1346 
1347 	down_read(&EXT4_I(inode)->xattr_sem);
1348 	if (!ext4_has_inline_data(inode)) {
1349 		up_read(&EXT4_I(inode)->xattr_sem);
1350 		*has_inline_data = 0;
1351 		goto out;
1352 	}
1353 
1354 	inline_size = ext4_get_inline_size(inode);
1355 	dir_buf = kmalloc(inline_size, GFP_NOFS);
1356 	if (!dir_buf) {
1357 		ret = -ENOMEM;
1358 		up_read(&EXT4_I(inode)->xattr_sem);
1359 		goto out;
1360 	}
1361 
1362 	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1363 	up_read(&EXT4_I(inode)->xattr_sem);
1364 	if (ret < 0)
1365 		goto out;
1366 
1367 	pos = 0;
1368 	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1369 	while (pos < inline_size) {
1370 		/*
1371 		 * As inlined dir doesn't store any information about '.' and
1372 		 * only the inode number of '..' is stored, we have to handle
1373 		 * them differently.
1374 		 */
1375 		if (pos == 0) {
1376 			fake.inode = cpu_to_le32(inode->i_ino);
1377 			fake.name_len = 1;
1378 			strcpy(fake.name, ".");
1379 			fake.rec_len = ext4_rec_len_to_disk(
1380 						EXT4_DIR_REC_LEN(fake.name_len),
1381 						inline_size);
1382 			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1383 			de = &fake;
1384 			pos = EXT4_INLINE_DOTDOT_OFFSET;
1385 		} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1386 			fake.inode = cpu_to_le32(parent_ino);
1387 			fake.name_len = 2;
1388 			strcpy(fake.name, "..");
1389 			fake.rec_len = ext4_rec_len_to_disk(
1390 						EXT4_DIR_REC_LEN(fake.name_len),
1391 						inline_size);
1392 			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1393 			de = &fake;
1394 			pos = EXT4_INLINE_DOTDOT_SIZE;
1395 		} else {
1396 			de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1397 			pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1398 			if (ext4_check_dir_entry(inode, dir_file, de,
1399 					 iloc.bh, dir_buf,
1400 					 inline_size, pos)) {
1401 				ret = count;
1402 				goto out;
1403 			}
1404 		}
1405 
1406 		ext4fs_dirhash(de->name, de->name_len, hinfo);
1407 		if ((hinfo->hash < start_hash) ||
1408 		    ((hinfo->hash == start_hash) &&
1409 		     (hinfo->minor_hash < start_minor_hash)))
1410 			continue;
1411 		if (de->inode == 0)
1412 			continue;
1413 		tmp_str.name = de->name;
1414 		tmp_str.len = de->name_len;
1415 		err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1416 					      hinfo->minor_hash, de, &tmp_str);
1417 		if (err) {
1418 			count = err;
1419 			goto out;
1420 		}
1421 		count++;
1422 	}
1423 	ret = count;
1424 out:
1425 	kfree(dir_buf);
1426 	brelse(iloc.bh);
1427 	return ret;
1428 }
1429 
1430 /*
1431  * So this function is called when the volume is mkfsed with
1432  * dir_index disabled. In order to keep f_pos persistent
1433  * after we convert from an inlined dir to a blocked based,
1434  * we just pretend that we are a normal dir and return the
1435  * offset as if '.' and '..' really take place.
1436  *
1437  */
1438 int ext4_read_inline_dir(struct file *file,
1439 			 struct dir_context *ctx,
1440 			 int *has_inline_data)
1441 {
1442 	unsigned int offset, parent_ino;
1443 	int i;
1444 	struct ext4_dir_entry_2 *de;
1445 	struct super_block *sb;
1446 	struct inode *inode = file_inode(file);
1447 	int ret, inline_size = 0;
1448 	struct ext4_iloc iloc;
1449 	void *dir_buf = NULL;
1450 	int dotdot_offset, dotdot_size, extra_offset, extra_size;
1451 
1452 	ret = ext4_get_inode_loc(inode, &iloc);
1453 	if (ret)
1454 		return ret;
1455 
1456 	down_read(&EXT4_I(inode)->xattr_sem);
1457 	if (!ext4_has_inline_data(inode)) {
1458 		up_read(&EXT4_I(inode)->xattr_sem);
1459 		*has_inline_data = 0;
1460 		goto out;
1461 	}
1462 
1463 	inline_size = ext4_get_inline_size(inode);
1464 	dir_buf = kmalloc(inline_size, GFP_NOFS);
1465 	if (!dir_buf) {
1466 		ret = -ENOMEM;
1467 		up_read(&EXT4_I(inode)->xattr_sem);
1468 		goto out;
1469 	}
1470 
1471 	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1472 	up_read(&EXT4_I(inode)->xattr_sem);
1473 	if (ret < 0)
1474 		goto out;
1475 
1476 	ret = 0;
1477 	sb = inode->i_sb;
1478 	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1479 	offset = ctx->pos;
1480 
1481 	/*
1482 	 * dotdot_offset and dotdot_size is the real offset and
1483 	 * size for ".." and "." if the dir is block based while
1484 	 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1485 	 * So we will use extra_offset and extra_size to indicate them
1486 	 * during the inline dir iteration.
1487 	 */
1488 	dotdot_offset = EXT4_DIR_REC_LEN(1);
1489 	dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1490 	extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1491 	extra_size = extra_offset + inline_size;
1492 
1493 	/*
1494 	 * If the version has changed since the last call to
1495 	 * readdir(2), then we might be pointing to an invalid
1496 	 * dirent right now.  Scan from the start of the inline
1497 	 * dir to make sure.
1498 	 */
1499 	if (file->f_version != inode->i_version) {
1500 		for (i = 0; i < extra_size && i < offset;) {
1501 			/*
1502 			 * "." is with offset 0 and
1503 			 * ".." is dotdot_offset.
1504 			 */
1505 			if (!i) {
1506 				i = dotdot_offset;
1507 				continue;
1508 			} else if (i == dotdot_offset) {
1509 				i = dotdot_size;
1510 				continue;
1511 			}
1512 			/* for other entry, the real offset in
1513 			 * the buf has to be tuned accordingly.
1514 			 */
1515 			de = (struct ext4_dir_entry_2 *)
1516 				(dir_buf + i - extra_offset);
1517 			/* It's too expensive to do a full
1518 			 * dirent test each time round this
1519 			 * loop, but we do have to test at
1520 			 * least that it is non-zero.  A
1521 			 * failure will be detected in the
1522 			 * dirent test below. */
1523 			if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1524 				< EXT4_DIR_REC_LEN(1))
1525 				break;
1526 			i += ext4_rec_len_from_disk(de->rec_len,
1527 						    extra_size);
1528 		}
1529 		offset = i;
1530 		ctx->pos = offset;
1531 		file->f_version = inode->i_version;
1532 	}
1533 
1534 	while (ctx->pos < extra_size) {
1535 		if (ctx->pos == 0) {
1536 			if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1537 				goto out;
1538 			ctx->pos = dotdot_offset;
1539 			continue;
1540 		}
1541 
1542 		if (ctx->pos == dotdot_offset) {
1543 			if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1544 				goto out;
1545 			ctx->pos = dotdot_size;
1546 			continue;
1547 		}
1548 
1549 		de = (struct ext4_dir_entry_2 *)
1550 			(dir_buf + ctx->pos - extra_offset);
1551 		if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1552 					 extra_size, ctx->pos))
1553 			goto out;
1554 		if (le32_to_cpu(de->inode)) {
1555 			if (!dir_emit(ctx, de->name, de->name_len,
1556 				      le32_to_cpu(de->inode),
1557 				      get_dtype(sb, de->file_type)))
1558 				goto out;
1559 		}
1560 		ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1561 	}
1562 out:
1563 	kfree(dir_buf);
1564 	brelse(iloc.bh);
1565 	return ret;
1566 }
1567 
1568 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1569 					struct ext4_dir_entry_2 **parent_de,
1570 					int *retval)
1571 {
1572 	struct ext4_iloc iloc;
1573 
1574 	*retval = ext4_get_inode_loc(inode, &iloc);
1575 	if (*retval)
1576 		return NULL;
1577 
1578 	*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1579 
1580 	return iloc.bh;
1581 }
1582 
1583 /*
1584  * Try to create the inline data for the new dir.
1585  * If it succeeds, return 0, otherwise return the error.
1586  * In case of ENOSPC, the caller should create the normal disk layout dir.
1587  */
1588 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1589 			       struct inode *inode)
1590 {
1591 	int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1592 	struct ext4_iloc iloc;
1593 	struct ext4_dir_entry_2 *de;
1594 
1595 	ret = ext4_get_inode_loc(inode, &iloc);
1596 	if (ret)
1597 		return ret;
1598 
1599 	ret = ext4_prepare_inline_data(handle, inode, inline_size);
1600 	if (ret)
1601 		goto out;
1602 
1603 	/*
1604 	 * For inline dir, we only save the inode information for the ".."
1605 	 * and create a fake dentry to cover the left space.
1606 	 */
1607 	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1608 	de->inode = cpu_to_le32(parent->i_ino);
1609 	de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1610 	de->inode = 0;
1611 	de->rec_len = ext4_rec_len_to_disk(
1612 				inline_size - EXT4_INLINE_DOTDOT_SIZE,
1613 				inline_size);
1614 	set_nlink(inode, 2);
1615 	inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1616 out:
1617 	brelse(iloc.bh);
1618 	return ret;
1619 }
1620 
1621 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1622 					struct ext4_filename *fname,
1623 					const struct qstr *d_name,
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, d_name, 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, d_name, 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;
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 	down_write(&EXT4_I(dir)->xattr_sem);
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 	err = ext4_mark_inode_dirty(handle, dir);
1713 	if (unlikely(err))
1714 		goto out;
1715 
1716 	ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1717 out:
1718 	up_write(&EXT4_I(dir)->xattr_sem);
1719 	brelse(iloc.bh);
1720 	if (err != -ENOENT)
1721 		ext4_std_error(dir->i_sb, err);
1722 	return err;
1723 }
1724 
1725 /*
1726  * Get the inline dentry at offset.
1727  */
1728 static inline struct ext4_dir_entry_2 *
1729 ext4_get_inline_entry(struct inode *inode,
1730 		      struct ext4_iloc *iloc,
1731 		      unsigned int offset,
1732 		      void **inline_start,
1733 		      int *inline_size)
1734 {
1735 	void *inline_pos;
1736 
1737 	BUG_ON(offset > ext4_get_inline_size(inode));
1738 
1739 	if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1740 		inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1741 		*inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1742 	} else {
1743 		inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1744 		offset -= EXT4_MIN_INLINE_DATA_SIZE;
1745 		*inline_size = ext4_get_inline_size(inode) -
1746 				EXT4_MIN_INLINE_DATA_SIZE;
1747 	}
1748 
1749 	if (inline_start)
1750 		*inline_start = inline_pos;
1751 	return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1752 }
1753 
1754 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1755 {
1756 	int err, inline_size;
1757 	struct ext4_iloc iloc;
1758 	void *inline_pos;
1759 	unsigned int offset;
1760 	struct ext4_dir_entry_2 *de;
1761 	bool ret = true;
1762 
1763 	err = ext4_get_inode_loc(dir, &iloc);
1764 	if (err) {
1765 		EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1766 				 err, dir->i_ino);
1767 		return true;
1768 	}
1769 
1770 	down_read(&EXT4_I(dir)->xattr_sem);
1771 	if (!ext4_has_inline_data(dir)) {
1772 		*has_inline_data = 0;
1773 		goto out;
1774 	}
1775 
1776 	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1777 	if (!le32_to_cpu(de->inode)) {
1778 		ext4_warning(dir->i_sb,
1779 			     "bad inline directory (dir #%lu) - no `..'",
1780 			     dir->i_ino);
1781 		ret = true;
1782 		goto out;
1783 	}
1784 
1785 	offset = EXT4_INLINE_DOTDOT_SIZE;
1786 	while (offset < dir->i_size) {
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;
1818 
1819 	down_write(&EXT4_I(inode)->xattr_sem);
1820 	ret = ext4_destroy_inline_data_nolock(handle, inode);
1821 	up_write(&EXT4_I(inode)->xattr_sem);
1822 
1823 	return ret;
1824 }
1825 
1826 int ext4_inline_data_fiemap(struct inode *inode,
1827 			    struct fiemap_extent_info *fieinfo,
1828 			    int *has_inline, __u64 start, __u64 len)
1829 {
1830 	__u64 physical = 0;
1831 	__u64 inline_len;
1832 	__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1833 		FIEMAP_EXTENT_LAST;
1834 	int error = 0;
1835 	struct ext4_iloc iloc;
1836 
1837 	down_read(&EXT4_I(inode)->xattr_sem);
1838 	if (!ext4_has_inline_data(inode)) {
1839 		*has_inline = 0;
1840 		goto out;
1841 	}
1842 	inline_len = min_t(size_t, ext4_get_inline_size(inode),
1843 			   i_size_read(inode));
1844 	if (start >= inline_len)
1845 		goto out;
1846 	if (start + len < inline_len)
1847 		inline_len = start + len;
1848 	inline_len -= start;
1849 
1850 	error = ext4_get_inode_loc(inode, &iloc);
1851 	if (error)
1852 		goto out;
1853 
1854 	physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1855 	physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1856 	physical += offsetof(struct ext4_inode, i_block);
1857 
1858 	if (physical)
1859 		error = fiemap_fill_next_extent(fieinfo, start, physical,
1860 						inline_len, flags);
1861 	brelse(iloc.bh);
1862 out:
1863 	up_read(&EXT4_I(inode)->xattr_sem);
1864 	return (error < 0 ? error : 0);
1865 }
1866 
1867 /*
1868  * Called during xattr set, and if we can sparse space 'needed',
1869  * just create the extent tree evict the data to the outer block.
1870  *
1871  * We use jbd2 instead of page cache to move data to the 1st block
1872  * so that the whole transaction can be committed as a whole and
1873  * the data isn't lost because of the delayed page cache write.
1874  */
1875 int ext4_try_to_evict_inline_data(handle_t *handle,
1876 				  struct inode *inode,
1877 				  int needed)
1878 {
1879 	int error;
1880 	struct ext4_xattr_entry *entry;
1881 	struct ext4_inode *raw_inode;
1882 	struct ext4_iloc iloc;
1883 
1884 	error = ext4_get_inode_loc(inode, &iloc);
1885 	if (error)
1886 		return error;
1887 
1888 	raw_inode = ext4_raw_inode(&iloc);
1889 	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1890 					    EXT4_I(inode)->i_inline_off);
1891 	if (EXT4_XATTR_LEN(entry->e_name_len) +
1892 	    EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1893 		error = -ENOSPC;
1894 		goto out;
1895 	}
1896 
1897 	error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1898 out:
1899 	brelse(iloc.bh);
1900 	return error;
1901 }
1902 
1903 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1904 {
1905 	handle_t *handle;
1906 	int inline_size, value_len, needed_blocks;
1907 	size_t i_size;
1908 	void *value = NULL;
1909 	struct ext4_xattr_ibody_find is = {
1910 		.s = { .not_found = -ENODATA, },
1911 	};
1912 	struct ext4_xattr_info i = {
1913 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
1914 		.name = EXT4_XATTR_SYSTEM_DATA,
1915 	};
1916 
1917 
1918 	needed_blocks = ext4_writepage_trans_blocks(inode);
1919 	handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1920 	if (IS_ERR(handle))
1921 		return;
1922 
1923 	down_write(&EXT4_I(inode)->xattr_sem);
1924 	if (!ext4_has_inline_data(inode)) {
1925 		*has_inline = 0;
1926 		ext4_journal_stop(handle);
1927 		return;
1928 	}
1929 
1930 	if (ext4_orphan_add(handle, inode))
1931 		goto out;
1932 
1933 	if (ext4_get_inode_loc(inode, &is.iloc))
1934 		goto out;
1935 
1936 	down_write(&EXT4_I(inode)->i_data_sem);
1937 	i_size = inode->i_size;
1938 	inline_size = ext4_get_inline_size(inode);
1939 	EXT4_I(inode)->i_disksize = i_size;
1940 
1941 	if (i_size < inline_size) {
1942 		/* Clear the content in the xattr space. */
1943 		if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1944 			if (ext4_xattr_ibody_find(inode, &i, &is))
1945 				goto out_error;
1946 
1947 			BUG_ON(is.s.not_found);
1948 
1949 			value_len = le32_to_cpu(is.s.here->e_value_size);
1950 			value = kmalloc(value_len, GFP_NOFS);
1951 			if (!value)
1952 				goto out_error;
1953 
1954 			if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1955 						value, value_len))
1956 				goto out_error;
1957 
1958 			i.value = value;
1959 			i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1960 					i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1961 			if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1962 				goto out_error;
1963 		}
1964 
1965 		/* Clear the content within i_blocks. */
1966 		if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1967 			void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1968 			memset(p + i_size, 0,
1969 			       EXT4_MIN_INLINE_DATA_SIZE - i_size);
1970 		}
1971 
1972 		EXT4_I(inode)->i_inline_size = i_size <
1973 					EXT4_MIN_INLINE_DATA_SIZE ?
1974 					EXT4_MIN_INLINE_DATA_SIZE : i_size;
1975 	}
1976 
1977 out_error:
1978 	up_write(&EXT4_I(inode)->i_data_sem);
1979 out:
1980 	brelse(is.iloc.bh);
1981 	up_write(&EXT4_I(inode)->xattr_sem);
1982 	kfree(value);
1983 	if (inode->i_nlink)
1984 		ext4_orphan_del(handle, inode);
1985 
1986 	inode->i_mtime = inode->i_ctime = current_time(inode);
1987 	ext4_mark_inode_dirty(handle, inode);
1988 	if (IS_SYNC(inode))
1989 		ext4_handle_sync(handle);
1990 
1991 	ext4_journal_stop(handle);
1992 	return;
1993 }
1994 
1995 int ext4_convert_inline_data(struct inode *inode)
1996 {
1997 	int error, needed_blocks;
1998 	handle_t *handle;
1999 	struct ext4_iloc iloc;
2000 
2001 	if (!ext4_has_inline_data(inode)) {
2002 		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2003 		return 0;
2004 	}
2005 
2006 	needed_blocks = ext4_writepage_trans_blocks(inode);
2007 
2008 	iloc.bh = NULL;
2009 	error = ext4_get_inode_loc(inode, &iloc);
2010 	if (error)
2011 		return error;
2012 
2013 	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2014 	if (IS_ERR(handle)) {
2015 		error = PTR_ERR(handle);
2016 		goto out_free;
2017 	}
2018 
2019 	down_write(&EXT4_I(inode)->xattr_sem);
2020 	if (!ext4_has_inline_data(inode)) {
2021 		up_write(&EXT4_I(inode)->xattr_sem);
2022 		goto out;
2023 	}
2024 
2025 	error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2026 	up_write(&EXT4_I(inode)->xattr_sem);
2027 out:
2028 	ext4_journal_stop(handle);
2029 out_free:
2030 	brelse(iloc.bh);
2031 	return error;
2032 }
2033