xref: /openbmc/linux/fs/ext4/inline.c (revision eb3fcf00)
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 	get_bh(is.iloc.bh);
303 	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
304 
305 out:
306 	brelse(is.iloc.bh);
307 	return error;
308 }
309 
310 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
311 				   unsigned int len)
312 {
313 	int error;
314 	void *value = NULL;
315 	struct ext4_xattr_ibody_find is = {
316 		.s = { .not_found = -ENODATA, },
317 	};
318 	struct ext4_xattr_info i = {
319 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
320 		.name = EXT4_XATTR_SYSTEM_DATA,
321 	};
322 
323 	/* If the old space is ok, write the data directly. */
324 	if (len <= EXT4_I(inode)->i_inline_size)
325 		return 0;
326 
327 	error = ext4_get_inode_loc(inode, &is.iloc);
328 	if (error)
329 		return error;
330 
331 	error = ext4_xattr_ibody_find(inode, &i, &is);
332 	if (error)
333 		goto out;
334 
335 	BUG_ON(is.s.not_found);
336 
337 	len -= EXT4_MIN_INLINE_DATA_SIZE;
338 	value = kzalloc(len, GFP_NOFS);
339 	if (!value)
340 		goto out;
341 
342 	error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
343 				     value, len);
344 	if (error == -ENODATA)
345 		goto out;
346 
347 	BUFFER_TRACE(is.iloc.bh, "get_write_access");
348 	error = ext4_journal_get_write_access(handle, is.iloc.bh);
349 	if (error)
350 		goto out;
351 
352 	/* Update the xttr entry. */
353 	i.value = value;
354 	i.value_len = len;
355 
356 	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
357 	if (error)
358 		goto out;
359 
360 	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
361 				      (void *)ext4_raw_inode(&is.iloc));
362 	EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
363 				le32_to_cpu(is.s.here->e_value_size);
364 	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
365 	get_bh(is.iloc.bh);
366 	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
367 
368 out:
369 	kfree(value);
370 	brelse(is.iloc.bh);
371 	return error;
372 }
373 
374 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
375 				    unsigned int len)
376 {
377 	int ret, size;
378 	struct ext4_inode_info *ei = EXT4_I(inode);
379 
380 	if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
381 		return -ENOSPC;
382 
383 	size = ext4_get_max_inline_size(inode);
384 	if (size < len)
385 		return -ENOSPC;
386 
387 	down_write(&EXT4_I(inode)->xattr_sem);
388 
389 	if (ei->i_inline_off)
390 		ret = ext4_update_inline_data(handle, inode, len);
391 	else
392 		ret = ext4_create_inline_data(handle, inode, len);
393 
394 	up_write(&EXT4_I(inode)->xattr_sem);
395 
396 	return ret;
397 }
398 
399 static int ext4_destroy_inline_data_nolock(handle_t *handle,
400 					   struct inode *inode)
401 {
402 	struct ext4_inode_info *ei = EXT4_I(inode);
403 	struct ext4_xattr_ibody_find is = {
404 		.s = { .not_found = 0, },
405 	};
406 	struct ext4_xattr_info i = {
407 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
408 		.name = EXT4_XATTR_SYSTEM_DATA,
409 		.value = NULL,
410 		.value_len = 0,
411 	};
412 	int error;
413 
414 	if (!ei->i_inline_off)
415 		return 0;
416 
417 	error = ext4_get_inode_loc(inode, &is.iloc);
418 	if (error)
419 		return error;
420 
421 	error = ext4_xattr_ibody_find(inode, &i, &is);
422 	if (error)
423 		goto out;
424 
425 	BUFFER_TRACE(is.iloc.bh, "get_write_access");
426 	error = ext4_journal_get_write_access(handle, is.iloc.bh);
427 	if (error)
428 		goto out;
429 
430 	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
431 	if (error)
432 		goto out;
433 
434 	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
435 		0, EXT4_MIN_INLINE_DATA_SIZE);
436 
437 	if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
438 				      EXT4_FEATURE_INCOMPAT_EXTENTS)) {
439 		if (S_ISDIR(inode->i_mode) ||
440 		    S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
441 			ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
442 			ext4_ext_tree_init(handle, inode);
443 		}
444 	}
445 	ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
446 
447 	get_bh(is.iloc.bh);
448 	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
449 
450 	EXT4_I(inode)->i_inline_off = 0;
451 	EXT4_I(inode)->i_inline_size = 0;
452 	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
453 out:
454 	brelse(is.iloc.bh);
455 	if (error == -ENODATA)
456 		error = 0;
457 	return error;
458 }
459 
460 static int ext4_read_inline_page(struct inode *inode, struct page *page)
461 {
462 	void *kaddr;
463 	int ret = 0;
464 	size_t len;
465 	struct ext4_iloc iloc;
466 
467 	BUG_ON(!PageLocked(page));
468 	BUG_ON(!ext4_has_inline_data(inode));
469 	BUG_ON(page->index);
470 
471 	if (!EXT4_I(inode)->i_inline_off) {
472 		ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
473 			     inode->i_ino);
474 		goto out;
475 	}
476 
477 	ret = ext4_get_inode_loc(inode, &iloc);
478 	if (ret)
479 		goto out;
480 
481 	len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
482 	kaddr = kmap_atomic(page);
483 	ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
484 	flush_dcache_page(page);
485 	kunmap_atomic(kaddr);
486 	zero_user_segment(page, len, PAGE_CACHE_SIZE);
487 	SetPageUptodate(page);
488 	brelse(iloc.bh);
489 
490 out:
491 	return ret;
492 }
493 
494 int ext4_readpage_inline(struct inode *inode, struct page *page)
495 {
496 	int ret = 0;
497 
498 	down_read(&EXT4_I(inode)->xattr_sem);
499 	if (!ext4_has_inline_data(inode)) {
500 		up_read(&EXT4_I(inode)->xattr_sem);
501 		return -EAGAIN;
502 	}
503 
504 	/*
505 	 * Current inline data can only exist in the 1st page,
506 	 * So for all the other pages, just set them uptodate.
507 	 */
508 	if (!page->index)
509 		ret = ext4_read_inline_page(inode, page);
510 	else if (!PageUptodate(page)) {
511 		zero_user_segment(page, 0, PAGE_CACHE_SIZE);
512 		SetPageUptodate(page);
513 	}
514 
515 	up_read(&EXT4_I(inode)->xattr_sem);
516 
517 	unlock_page(page);
518 	return ret >= 0 ? 0 : ret;
519 }
520 
521 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
522 					      struct inode *inode,
523 					      unsigned flags)
524 {
525 	int ret, needed_blocks;
526 	handle_t *handle = NULL;
527 	int retries = 0, sem_held = 0;
528 	struct page *page = NULL;
529 	unsigned from, to;
530 	struct ext4_iloc iloc;
531 
532 	if (!ext4_has_inline_data(inode)) {
533 		/*
534 		 * clear the flag so that no new write
535 		 * will trap here again.
536 		 */
537 		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
538 		return 0;
539 	}
540 
541 	needed_blocks = ext4_writepage_trans_blocks(inode);
542 
543 	ret = ext4_get_inode_loc(inode, &iloc);
544 	if (ret)
545 		return ret;
546 
547 retry:
548 	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
549 	if (IS_ERR(handle)) {
550 		ret = PTR_ERR(handle);
551 		handle = NULL;
552 		goto out;
553 	}
554 
555 	/* We cannot recurse into the filesystem as the transaction is already
556 	 * started */
557 	flags |= AOP_FLAG_NOFS;
558 
559 	page = grab_cache_page_write_begin(mapping, 0, flags);
560 	if (!page) {
561 		ret = -ENOMEM;
562 		goto out;
563 	}
564 
565 	down_write(&EXT4_I(inode)->xattr_sem);
566 	sem_held = 1;
567 	/* If some one has already done this for us, just exit. */
568 	if (!ext4_has_inline_data(inode)) {
569 		ret = 0;
570 		goto out;
571 	}
572 
573 	from = 0;
574 	to = ext4_get_inline_size(inode);
575 	if (!PageUptodate(page)) {
576 		ret = ext4_read_inline_page(inode, page);
577 		if (ret < 0)
578 			goto out;
579 	}
580 
581 	ret = ext4_destroy_inline_data_nolock(handle, inode);
582 	if (ret)
583 		goto out;
584 
585 	if (ext4_should_dioread_nolock(inode))
586 		ret = __block_write_begin(page, from, to, ext4_get_block_write);
587 	else
588 		ret = __block_write_begin(page, from, to, ext4_get_block);
589 
590 	if (!ret && ext4_should_journal_data(inode)) {
591 		ret = ext4_walk_page_buffers(handle, page_buffers(page),
592 					     from, to, NULL,
593 					     do_journal_get_write_access);
594 	}
595 
596 	if (ret) {
597 		unlock_page(page);
598 		page_cache_release(page);
599 		page = NULL;
600 		ext4_orphan_add(handle, inode);
601 		up_write(&EXT4_I(inode)->xattr_sem);
602 		sem_held = 0;
603 		ext4_journal_stop(handle);
604 		handle = NULL;
605 		ext4_truncate_failed_write(inode);
606 		/*
607 		 * If truncate failed early the inode might
608 		 * still be on the orphan list; we need to
609 		 * make sure the inode is removed from the
610 		 * orphan list in that case.
611 		 */
612 		if (inode->i_nlink)
613 			ext4_orphan_del(NULL, inode);
614 	}
615 
616 	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
617 		goto retry;
618 
619 	if (page)
620 		block_commit_write(page, from, to);
621 out:
622 	if (page) {
623 		unlock_page(page);
624 		page_cache_release(page);
625 	}
626 	if (sem_held)
627 		up_write(&EXT4_I(inode)->xattr_sem);
628 	if (handle)
629 		ext4_journal_stop(handle);
630 	brelse(iloc.bh);
631 	return ret;
632 }
633 
634 /*
635  * Try to write data in the inode.
636  * If the inode has inline data, check whether the new write can be
637  * in the inode also. If not, create the page the handle, move the data
638  * to the page make it update and let the later codes create extent for it.
639  */
640 int ext4_try_to_write_inline_data(struct address_space *mapping,
641 				  struct inode *inode,
642 				  loff_t pos, unsigned len,
643 				  unsigned flags,
644 				  struct page **pagep)
645 {
646 	int ret;
647 	handle_t *handle;
648 	struct page *page;
649 	struct ext4_iloc iloc;
650 
651 	if (pos + len > ext4_get_max_inline_size(inode))
652 		goto convert;
653 
654 	ret = ext4_get_inode_loc(inode, &iloc);
655 	if (ret)
656 		return ret;
657 
658 	/*
659 	 * The possible write could happen in the inode,
660 	 * so try to reserve the space in inode first.
661 	 */
662 	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
663 	if (IS_ERR(handle)) {
664 		ret = PTR_ERR(handle);
665 		handle = NULL;
666 		goto out;
667 	}
668 
669 	ret = ext4_prepare_inline_data(handle, inode, pos + len);
670 	if (ret && ret != -ENOSPC)
671 		goto out;
672 
673 	/* We don't have space in inline inode, so convert it to extent. */
674 	if (ret == -ENOSPC) {
675 		ext4_journal_stop(handle);
676 		brelse(iloc.bh);
677 		goto convert;
678 	}
679 
680 	flags |= AOP_FLAG_NOFS;
681 
682 	page = grab_cache_page_write_begin(mapping, 0, flags);
683 	if (!page) {
684 		ret = -ENOMEM;
685 		goto out;
686 	}
687 
688 	*pagep = page;
689 	down_read(&EXT4_I(inode)->xattr_sem);
690 	if (!ext4_has_inline_data(inode)) {
691 		ret = 0;
692 		unlock_page(page);
693 		page_cache_release(page);
694 		goto out_up_read;
695 	}
696 
697 	if (!PageUptodate(page)) {
698 		ret = ext4_read_inline_page(inode, page);
699 		if (ret < 0)
700 			goto out_up_read;
701 	}
702 
703 	ret = 1;
704 	handle = NULL;
705 out_up_read:
706 	up_read(&EXT4_I(inode)->xattr_sem);
707 out:
708 	if (handle)
709 		ext4_journal_stop(handle);
710 	brelse(iloc.bh);
711 	return ret;
712 convert:
713 	return ext4_convert_inline_data_to_extent(mapping,
714 						  inode, flags);
715 }
716 
717 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
718 			       unsigned copied, struct page *page)
719 {
720 	int ret;
721 	void *kaddr;
722 	struct ext4_iloc iloc;
723 
724 	if (unlikely(copied < len)) {
725 		if (!PageUptodate(page)) {
726 			copied = 0;
727 			goto out;
728 		}
729 	}
730 
731 	ret = ext4_get_inode_loc(inode, &iloc);
732 	if (ret) {
733 		ext4_std_error(inode->i_sb, ret);
734 		copied = 0;
735 		goto out;
736 	}
737 
738 	down_write(&EXT4_I(inode)->xattr_sem);
739 	BUG_ON(!ext4_has_inline_data(inode));
740 
741 	kaddr = kmap_atomic(page);
742 	ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
743 	kunmap_atomic(kaddr);
744 	SetPageUptodate(page);
745 	/* clear page dirty so that writepages wouldn't work for us. */
746 	ClearPageDirty(page);
747 
748 	up_write(&EXT4_I(inode)->xattr_sem);
749 	brelse(iloc.bh);
750 out:
751 	return copied;
752 }
753 
754 struct buffer_head *
755 ext4_journalled_write_inline_data(struct inode *inode,
756 				  unsigned len,
757 				  struct page *page)
758 {
759 	int ret;
760 	void *kaddr;
761 	struct ext4_iloc iloc;
762 
763 	ret = ext4_get_inode_loc(inode, &iloc);
764 	if (ret) {
765 		ext4_std_error(inode->i_sb, ret);
766 		return NULL;
767 	}
768 
769 	down_write(&EXT4_I(inode)->xattr_sem);
770 	kaddr = kmap_atomic(page);
771 	ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
772 	kunmap_atomic(kaddr);
773 	up_write(&EXT4_I(inode)->xattr_sem);
774 
775 	return iloc.bh;
776 }
777 
778 /*
779  * Try to make the page cache and handle ready for the inline data case.
780  * We can call this function in 2 cases:
781  * 1. The inode is created and the first write exceeds inline size. We can
782  *    clear the inode state safely.
783  * 2. The inode has inline data, then we need to read the data, make it
784  *    update and dirty so that ext4_da_writepages can handle it. We don't
785  *    need to start the journal since the file's metatdata isn't changed now.
786  */
787 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
788 						 struct inode *inode,
789 						 unsigned flags,
790 						 void **fsdata)
791 {
792 	int ret = 0, inline_size;
793 	struct page *page;
794 
795 	page = grab_cache_page_write_begin(mapping, 0, flags);
796 	if (!page)
797 		return -ENOMEM;
798 
799 	down_read(&EXT4_I(inode)->xattr_sem);
800 	if (!ext4_has_inline_data(inode)) {
801 		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
802 		goto out;
803 	}
804 
805 	inline_size = ext4_get_inline_size(inode);
806 
807 	if (!PageUptodate(page)) {
808 		ret = ext4_read_inline_page(inode, page);
809 		if (ret < 0)
810 			goto out;
811 	}
812 
813 	ret = __block_write_begin(page, 0, inline_size,
814 				  ext4_da_get_block_prep);
815 	if (ret) {
816 		up_read(&EXT4_I(inode)->xattr_sem);
817 		unlock_page(page);
818 		page_cache_release(page);
819 		ext4_truncate_failed_write(inode);
820 		return ret;
821 	}
822 
823 	SetPageDirty(page);
824 	SetPageUptodate(page);
825 	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
826 	*fsdata = (void *)CONVERT_INLINE_DATA;
827 
828 out:
829 	up_read(&EXT4_I(inode)->xattr_sem);
830 	if (page) {
831 		unlock_page(page);
832 		page_cache_release(page);
833 	}
834 	return ret;
835 }
836 
837 /*
838  * Prepare the write for the inline data.
839  * If the the data can be written into the inode, we just read
840  * the page and make it uptodate, and start the journal.
841  * Otherwise read the page, makes it dirty so that it can be
842  * handle in writepages(the i_disksize update is left to the
843  * normal ext4_da_write_end).
844  */
845 int ext4_da_write_inline_data_begin(struct address_space *mapping,
846 				    struct inode *inode,
847 				    loff_t pos, unsigned len,
848 				    unsigned flags,
849 				    struct page **pagep,
850 				    void **fsdata)
851 {
852 	int ret, inline_size;
853 	handle_t *handle;
854 	struct page *page;
855 	struct ext4_iloc iloc;
856 	int retries;
857 
858 	ret = ext4_get_inode_loc(inode, &iloc);
859 	if (ret)
860 		return ret;
861 
862 retry_journal:
863 	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
864 	if (IS_ERR(handle)) {
865 		ret = PTR_ERR(handle);
866 		goto out;
867 	}
868 
869 	inline_size = ext4_get_max_inline_size(inode);
870 
871 	ret = -ENOSPC;
872 	if (inline_size >= pos + len) {
873 		ret = ext4_prepare_inline_data(handle, inode, pos + len);
874 		if (ret && ret != -ENOSPC)
875 			goto out_journal;
876 	}
877 
878 	/*
879 	 * We cannot recurse into the filesystem as the transaction
880 	 * is already started.
881 	 */
882 	flags |= AOP_FLAG_NOFS;
883 
884 	if (ret == -ENOSPC) {
885 		ret = ext4_da_convert_inline_data_to_extent(mapping,
886 							    inode,
887 							    flags,
888 							    fsdata);
889 		ext4_journal_stop(handle);
890 		if (ret == -ENOSPC &&
891 		    ext4_should_retry_alloc(inode->i_sb, &retries))
892 			goto retry_journal;
893 		goto out;
894 	}
895 
896 
897 	page = grab_cache_page_write_begin(mapping, 0, flags);
898 	if (!page) {
899 		ret = -ENOMEM;
900 		goto out_journal;
901 	}
902 
903 	down_read(&EXT4_I(inode)->xattr_sem);
904 	if (!ext4_has_inline_data(inode)) {
905 		ret = 0;
906 		goto out_release_page;
907 	}
908 
909 	if (!PageUptodate(page)) {
910 		ret = ext4_read_inline_page(inode, page);
911 		if (ret < 0)
912 			goto out_release_page;
913 	}
914 
915 	up_read(&EXT4_I(inode)->xattr_sem);
916 	*pagep = page;
917 	brelse(iloc.bh);
918 	return 1;
919 out_release_page:
920 	up_read(&EXT4_I(inode)->xattr_sem);
921 	unlock_page(page);
922 	page_cache_release(page);
923 out_journal:
924 	ext4_journal_stop(handle);
925 out:
926 	brelse(iloc.bh);
927 	return ret;
928 }
929 
930 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
931 				  unsigned len, unsigned copied,
932 				  struct page *page)
933 {
934 	int i_size_changed = 0;
935 
936 	copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
937 
938 	/*
939 	 * No need to use i_size_read() here, the i_size
940 	 * cannot change under us because we hold i_mutex.
941 	 *
942 	 * But it's important to update i_size while still holding page lock:
943 	 * page writeout could otherwise come in and zero beyond i_size.
944 	 */
945 	if (pos+copied > inode->i_size) {
946 		i_size_write(inode, pos+copied);
947 		i_size_changed = 1;
948 	}
949 	unlock_page(page);
950 	page_cache_release(page);
951 
952 	/*
953 	 * Don't mark the inode dirty under page lock. First, it unnecessarily
954 	 * makes the holding time of page lock longer. Second, it forces lock
955 	 * ordering of page lock and transaction start for journaling
956 	 * filesystems.
957 	 */
958 	if (i_size_changed)
959 		mark_inode_dirty(inode);
960 
961 	return copied;
962 }
963 
964 #ifdef INLINE_DIR_DEBUG
965 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
966 			  void *inline_start, int inline_size)
967 {
968 	int offset;
969 	unsigned short de_len;
970 	struct ext4_dir_entry_2 *de = inline_start;
971 	void *dlimit = inline_start + inline_size;
972 
973 	trace_printk("inode %lu\n", dir->i_ino);
974 	offset = 0;
975 	while ((void *)de < dlimit) {
976 		de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
977 		trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
978 			     offset, de_len, de->name_len, de->name,
979 			     de->name_len, le32_to_cpu(de->inode));
980 		if (ext4_check_dir_entry(dir, NULL, de, bh,
981 					 inline_start, inline_size, offset))
982 			BUG();
983 
984 		offset += de_len;
985 		de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
986 	}
987 }
988 #else
989 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
990 #endif
991 
992 /*
993  * Add a new entry into a inline dir.
994  * It will return -ENOSPC if no space is available, and -EIO
995  * and -EEXIST if directory entry already exists.
996  */
997 static int ext4_add_dirent_to_inline(handle_t *handle,
998 				     struct ext4_filename *fname,
999 				     struct dentry *dentry,
1000 				     struct inode *inode,
1001 				     struct ext4_iloc *iloc,
1002 				     void *inline_start, int inline_size)
1003 {
1004 	struct inode	*dir = d_inode(dentry->d_parent);
1005 	int		err;
1006 	struct ext4_dir_entry_2 *de;
1007 
1008 	err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1009 				inline_size, fname, &de);
1010 	if (err)
1011 		return err;
1012 
1013 	BUFFER_TRACE(iloc->bh, "get_write_access");
1014 	err = ext4_journal_get_write_access(handle, iloc->bh);
1015 	if (err)
1016 		return err;
1017 	ext4_insert_dentry(dir, inode, de, inline_size, fname);
1018 
1019 	ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1020 
1021 	/*
1022 	 * XXX shouldn't update any times until successful
1023 	 * completion of syscall, but too many callers depend
1024 	 * on this.
1025 	 *
1026 	 * XXX similarly, too many callers depend on
1027 	 * ext4_new_inode() setting the times, but error
1028 	 * recovery deletes the inode, so the worst that can
1029 	 * happen is that the times are slightly out of date
1030 	 * and/or different from the directory change time.
1031 	 */
1032 	dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1033 	ext4_update_dx_flag(dir);
1034 	dir->i_version++;
1035 	ext4_mark_inode_dirty(handle, dir);
1036 	return 1;
1037 }
1038 
1039 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1040 				       struct ext4_iloc *iloc)
1041 {
1042 	struct ext4_xattr_entry *entry;
1043 	struct ext4_xattr_ibody_header *header;
1044 
1045 	BUG_ON(!EXT4_I(inode)->i_inline_off);
1046 
1047 	header = IHDR(inode, ext4_raw_inode(iloc));
1048 	entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1049 					    EXT4_I(inode)->i_inline_off);
1050 
1051 	return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1052 }
1053 
1054 /* Set the final de to cover the whole block. */
1055 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1056 {
1057 	struct ext4_dir_entry_2 *de, *prev_de;
1058 	void *limit;
1059 	int de_len;
1060 
1061 	de = (struct ext4_dir_entry_2 *)de_buf;
1062 	if (old_size) {
1063 		limit = de_buf + old_size;
1064 		do {
1065 			prev_de = de;
1066 			de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1067 			de_buf += de_len;
1068 			de = (struct ext4_dir_entry_2 *)de_buf;
1069 		} while (de_buf < limit);
1070 
1071 		prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1072 							old_size, new_size);
1073 	} else {
1074 		/* this is just created, so create an empty entry. */
1075 		de->inode = 0;
1076 		de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1077 	}
1078 }
1079 
1080 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1081 				  struct ext4_iloc *iloc)
1082 {
1083 	int ret;
1084 	int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1085 	int new_size = get_max_inline_xattr_value_size(dir, iloc);
1086 
1087 	if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1088 		return -ENOSPC;
1089 
1090 	ret = ext4_update_inline_data(handle, dir,
1091 				      new_size + EXT4_MIN_INLINE_DATA_SIZE);
1092 	if (ret)
1093 		return ret;
1094 
1095 	ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1096 			     EXT4_I(dir)->i_inline_size -
1097 						EXT4_MIN_INLINE_DATA_SIZE);
1098 	dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1099 	return 0;
1100 }
1101 
1102 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1103 				     struct ext4_iloc *iloc,
1104 				     void *buf, int inline_size)
1105 {
1106 	ext4_create_inline_data(handle, inode, inline_size);
1107 	ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1108 	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1109 }
1110 
1111 static int ext4_finish_convert_inline_dir(handle_t *handle,
1112 					  struct inode *inode,
1113 					  struct buffer_head *dir_block,
1114 					  void *buf,
1115 					  int inline_size)
1116 {
1117 	int err, csum_size = 0, header_size = 0;
1118 	struct ext4_dir_entry_2 *de;
1119 	struct ext4_dir_entry_tail *t;
1120 	void *target = dir_block->b_data;
1121 
1122 	/*
1123 	 * First create "." and ".." and then copy the dir information
1124 	 * back to the block.
1125 	 */
1126 	de = (struct ext4_dir_entry_2 *)target;
1127 	de = ext4_init_dot_dotdot(inode, de,
1128 		inode->i_sb->s_blocksize, csum_size,
1129 		le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1130 	header_size = (void *)de - target;
1131 
1132 	memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1133 		inline_size - EXT4_INLINE_DOTDOT_SIZE);
1134 
1135 	if (ext4_has_metadata_csum(inode->i_sb))
1136 		csum_size = sizeof(struct ext4_dir_entry_tail);
1137 
1138 	inode->i_size = inode->i_sb->s_blocksize;
1139 	i_size_write(inode, inode->i_sb->s_blocksize);
1140 	EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1141 	ext4_update_final_de(dir_block->b_data,
1142 			inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1143 			inode->i_sb->s_blocksize - csum_size);
1144 
1145 	if (csum_size) {
1146 		t = EXT4_DIRENT_TAIL(dir_block->b_data,
1147 				     inode->i_sb->s_blocksize);
1148 		initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1149 	}
1150 	set_buffer_uptodate(dir_block);
1151 	err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1152 	if (err)
1153 		goto out;
1154 	set_buffer_verified(dir_block);
1155 out:
1156 	return err;
1157 }
1158 
1159 static int ext4_convert_inline_data_nolock(handle_t *handle,
1160 					   struct inode *inode,
1161 					   struct ext4_iloc *iloc)
1162 {
1163 	int error;
1164 	void *buf = NULL;
1165 	struct buffer_head *data_bh = NULL;
1166 	struct ext4_map_blocks map;
1167 	int inline_size;
1168 
1169 	inline_size = ext4_get_inline_size(inode);
1170 	buf = kmalloc(inline_size, GFP_NOFS);
1171 	if (!buf) {
1172 		error = -ENOMEM;
1173 		goto out;
1174 	}
1175 
1176 	error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1177 	if (error < 0)
1178 		goto out;
1179 
1180 	/*
1181 	 * Make sure the inline directory entries pass checks before we try to
1182 	 * convert them, so that we avoid touching stuff that needs fsck.
1183 	 */
1184 	if (S_ISDIR(inode->i_mode)) {
1185 		error = ext4_check_all_de(inode, iloc->bh,
1186 					buf + EXT4_INLINE_DOTDOT_SIZE,
1187 					inline_size - EXT4_INLINE_DOTDOT_SIZE);
1188 		if (error)
1189 			goto out;
1190 	}
1191 
1192 	error = ext4_destroy_inline_data_nolock(handle, inode);
1193 	if (error)
1194 		goto out;
1195 
1196 	map.m_lblk = 0;
1197 	map.m_len = 1;
1198 	map.m_flags = 0;
1199 	error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1200 	if (error < 0)
1201 		goto out_restore;
1202 	if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1203 		error = -EIO;
1204 		goto out_restore;
1205 	}
1206 
1207 	data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1208 	if (!data_bh) {
1209 		error = -ENOMEM;
1210 		goto out_restore;
1211 	}
1212 
1213 	lock_buffer(data_bh);
1214 	error = ext4_journal_get_create_access(handle, data_bh);
1215 	if (error) {
1216 		unlock_buffer(data_bh);
1217 		error = -EIO;
1218 		goto out_restore;
1219 	}
1220 	memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1221 
1222 	if (!S_ISDIR(inode->i_mode)) {
1223 		memcpy(data_bh->b_data, buf, inline_size);
1224 		set_buffer_uptodate(data_bh);
1225 		error = ext4_handle_dirty_metadata(handle,
1226 						   inode, data_bh);
1227 	} else {
1228 		error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1229 						       buf, inline_size);
1230 	}
1231 
1232 	unlock_buffer(data_bh);
1233 out_restore:
1234 	if (error)
1235 		ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1236 
1237 out:
1238 	brelse(data_bh);
1239 	kfree(buf);
1240 	return error;
1241 }
1242 
1243 /*
1244  * Try to add the new entry to the inline data.
1245  * If succeeds, return 0. If not, extended the inline dir and copied data to
1246  * the new created block.
1247  */
1248 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1249 			      struct dentry *dentry, struct inode *inode)
1250 {
1251 	int ret, inline_size;
1252 	void *inline_start;
1253 	struct ext4_iloc iloc;
1254 	struct inode *dir = d_inode(dentry->d_parent);
1255 
1256 	ret = ext4_get_inode_loc(dir, &iloc);
1257 	if (ret)
1258 		return ret;
1259 
1260 	down_write(&EXT4_I(dir)->xattr_sem);
1261 	if (!ext4_has_inline_data(dir))
1262 		goto out;
1263 
1264 	inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1265 						 EXT4_INLINE_DOTDOT_SIZE;
1266 	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1267 
1268 	ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
1269 					inline_start, inline_size);
1270 	if (ret != -ENOSPC)
1271 		goto out;
1272 
1273 	/* check whether it can be inserted to inline xattr space. */
1274 	inline_size = EXT4_I(dir)->i_inline_size -
1275 			EXT4_MIN_INLINE_DATA_SIZE;
1276 	if (!inline_size) {
1277 		/* Try to use the xattr space.*/
1278 		ret = ext4_update_inline_dir(handle, dir, &iloc);
1279 		if (ret && ret != -ENOSPC)
1280 			goto out;
1281 
1282 		inline_size = EXT4_I(dir)->i_inline_size -
1283 				EXT4_MIN_INLINE_DATA_SIZE;
1284 	}
1285 
1286 	if (inline_size) {
1287 		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1288 
1289 		ret = ext4_add_dirent_to_inline(handle, fname, dentry,
1290 						inode, &iloc, inline_start,
1291 						inline_size);
1292 
1293 		if (ret != -ENOSPC)
1294 			goto out;
1295 	}
1296 
1297 	/*
1298 	 * The inline space is filled up, so create a new block for it.
1299 	 * As the extent tree will be created, we have to save the inline
1300 	 * dir first.
1301 	 */
1302 	ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1303 
1304 out:
1305 	ext4_mark_inode_dirty(handle, dir);
1306 	up_write(&EXT4_I(dir)->xattr_sem);
1307 	brelse(iloc.bh);
1308 	return ret;
1309 }
1310 
1311 /*
1312  * This function fills a red-black tree with information from an
1313  * inlined dir.  It returns the number directory entries loaded
1314  * into the tree.  If there is an error it is returned in err.
1315  */
1316 int htree_inlinedir_to_tree(struct file *dir_file,
1317 			    struct inode *dir, ext4_lblk_t block,
1318 			    struct dx_hash_info *hinfo,
1319 			    __u32 start_hash, __u32 start_minor_hash,
1320 			    int *has_inline_data)
1321 {
1322 	int err = 0, count = 0;
1323 	unsigned int parent_ino;
1324 	int pos;
1325 	struct ext4_dir_entry_2 *de;
1326 	struct inode *inode = file_inode(dir_file);
1327 	int ret, inline_size = 0;
1328 	struct ext4_iloc iloc;
1329 	void *dir_buf = NULL;
1330 	struct ext4_dir_entry_2 fake;
1331 	struct ext4_str tmp_str;
1332 
1333 	ret = ext4_get_inode_loc(inode, &iloc);
1334 	if (ret)
1335 		return ret;
1336 
1337 	down_read(&EXT4_I(inode)->xattr_sem);
1338 	if (!ext4_has_inline_data(inode)) {
1339 		up_read(&EXT4_I(inode)->xattr_sem);
1340 		*has_inline_data = 0;
1341 		goto out;
1342 	}
1343 
1344 	inline_size = ext4_get_inline_size(inode);
1345 	dir_buf = kmalloc(inline_size, GFP_NOFS);
1346 	if (!dir_buf) {
1347 		ret = -ENOMEM;
1348 		up_read(&EXT4_I(inode)->xattr_sem);
1349 		goto out;
1350 	}
1351 
1352 	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1353 	up_read(&EXT4_I(inode)->xattr_sem);
1354 	if (ret < 0)
1355 		goto out;
1356 
1357 	pos = 0;
1358 	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1359 	while (pos < inline_size) {
1360 		/*
1361 		 * As inlined dir doesn't store any information about '.' and
1362 		 * only the inode number of '..' is stored, we have to handle
1363 		 * them differently.
1364 		 */
1365 		if (pos == 0) {
1366 			fake.inode = cpu_to_le32(inode->i_ino);
1367 			fake.name_len = 1;
1368 			strcpy(fake.name, ".");
1369 			fake.rec_len = ext4_rec_len_to_disk(
1370 						EXT4_DIR_REC_LEN(fake.name_len),
1371 						inline_size);
1372 			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1373 			de = &fake;
1374 			pos = EXT4_INLINE_DOTDOT_OFFSET;
1375 		} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1376 			fake.inode = cpu_to_le32(parent_ino);
1377 			fake.name_len = 2;
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_SIZE;
1385 		} else {
1386 			de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1387 			pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1388 			if (ext4_check_dir_entry(inode, dir_file, de,
1389 					 iloc.bh, dir_buf,
1390 					 inline_size, pos)) {
1391 				ret = count;
1392 				goto out;
1393 			}
1394 		}
1395 
1396 		ext4fs_dirhash(de->name, de->name_len, hinfo);
1397 		if ((hinfo->hash < start_hash) ||
1398 		    ((hinfo->hash == start_hash) &&
1399 		     (hinfo->minor_hash < start_minor_hash)))
1400 			continue;
1401 		if (de->inode == 0)
1402 			continue;
1403 		tmp_str.name = de->name;
1404 		tmp_str.len = de->name_len;
1405 		err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1406 					      hinfo->minor_hash, de, &tmp_str);
1407 		if (err) {
1408 			count = err;
1409 			goto out;
1410 		}
1411 		count++;
1412 	}
1413 	ret = count;
1414 out:
1415 	kfree(dir_buf);
1416 	brelse(iloc.bh);
1417 	return ret;
1418 }
1419 
1420 /*
1421  * So this function is called when the volume is mkfsed with
1422  * dir_index disabled. In order to keep f_pos persistent
1423  * after we convert from an inlined dir to a blocked based,
1424  * we just pretend that we are a normal dir and return the
1425  * offset as if '.' and '..' really take place.
1426  *
1427  */
1428 int ext4_read_inline_dir(struct file *file,
1429 			 struct dir_context *ctx,
1430 			 int *has_inline_data)
1431 {
1432 	unsigned int offset, parent_ino;
1433 	int i;
1434 	struct ext4_dir_entry_2 *de;
1435 	struct super_block *sb;
1436 	struct inode *inode = file_inode(file);
1437 	int ret, inline_size = 0;
1438 	struct ext4_iloc iloc;
1439 	void *dir_buf = NULL;
1440 	int dotdot_offset, dotdot_size, extra_offset, extra_size;
1441 
1442 	ret = ext4_get_inode_loc(inode, &iloc);
1443 	if (ret)
1444 		return ret;
1445 
1446 	down_read(&EXT4_I(inode)->xattr_sem);
1447 	if (!ext4_has_inline_data(inode)) {
1448 		up_read(&EXT4_I(inode)->xattr_sem);
1449 		*has_inline_data = 0;
1450 		goto out;
1451 	}
1452 
1453 	inline_size = ext4_get_inline_size(inode);
1454 	dir_buf = kmalloc(inline_size, GFP_NOFS);
1455 	if (!dir_buf) {
1456 		ret = -ENOMEM;
1457 		up_read(&EXT4_I(inode)->xattr_sem);
1458 		goto out;
1459 	}
1460 
1461 	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1462 	up_read(&EXT4_I(inode)->xattr_sem);
1463 	if (ret < 0)
1464 		goto out;
1465 
1466 	ret = 0;
1467 	sb = inode->i_sb;
1468 	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1469 	offset = ctx->pos;
1470 
1471 	/*
1472 	 * dotdot_offset and dotdot_size is the real offset and
1473 	 * size for ".." and "." if the dir is block based while
1474 	 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1475 	 * So we will use extra_offset and extra_size to indicate them
1476 	 * during the inline dir iteration.
1477 	 */
1478 	dotdot_offset = EXT4_DIR_REC_LEN(1);
1479 	dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1480 	extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1481 	extra_size = extra_offset + inline_size;
1482 
1483 	/*
1484 	 * If the version has changed since the last call to
1485 	 * readdir(2), then we might be pointing to an invalid
1486 	 * dirent right now.  Scan from the start of the inline
1487 	 * dir to make sure.
1488 	 */
1489 	if (file->f_version != inode->i_version) {
1490 		for (i = 0; i < extra_size && i < offset;) {
1491 			/*
1492 			 * "." is with offset 0 and
1493 			 * ".." is dotdot_offset.
1494 			 */
1495 			if (!i) {
1496 				i = dotdot_offset;
1497 				continue;
1498 			} else if (i == dotdot_offset) {
1499 				i = dotdot_size;
1500 				continue;
1501 			}
1502 			/* for other entry, the real offset in
1503 			 * the buf has to be tuned accordingly.
1504 			 */
1505 			de = (struct ext4_dir_entry_2 *)
1506 				(dir_buf + i - extra_offset);
1507 			/* It's too expensive to do a full
1508 			 * dirent test each time round this
1509 			 * loop, but we do have to test at
1510 			 * least that it is non-zero.  A
1511 			 * failure will be detected in the
1512 			 * dirent test below. */
1513 			if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1514 				< EXT4_DIR_REC_LEN(1))
1515 				break;
1516 			i += ext4_rec_len_from_disk(de->rec_len,
1517 						    extra_size);
1518 		}
1519 		offset = i;
1520 		ctx->pos = offset;
1521 		file->f_version = inode->i_version;
1522 	}
1523 
1524 	while (ctx->pos < extra_size) {
1525 		if (ctx->pos == 0) {
1526 			if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1527 				goto out;
1528 			ctx->pos = dotdot_offset;
1529 			continue;
1530 		}
1531 
1532 		if (ctx->pos == dotdot_offset) {
1533 			if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1534 				goto out;
1535 			ctx->pos = dotdot_size;
1536 			continue;
1537 		}
1538 
1539 		de = (struct ext4_dir_entry_2 *)
1540 			(dir_buf + ctx->pos - extra_offset);
1541 		if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1542 					 extra_size, ctx->pos))
1543 			goto out;
1544 		if (le32_to_cpu(de->inode)) {
1545 			if (!dir_emit(ctx, de->name, de->name_len,
1546 				      le32_to_cpu(de->inode),
1547 				      get_dtype(sb, de->file_type)))
1548 				goto out;
1549 		}
1550 		ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1551 	}
1552 out:
1553 	kfree(dir_buf);
1554 	brelse(iloc.bh);
1555 	return ret;
1556 }
1557 
1558 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1559 					struct ext4_dir_entry_2 **parent_de,
1560 					int *retval)
1561 {
1562 	struct ext4_iloc iloc;
1563 
1564 	*retval = ext4_get_inode_loc(inode, &iloc);
1565 	if (*retval)
1566 		return NULL;
1567 
1568 	*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1569 
1570 	return iloc.bh;
1571 }
1572 
1573 /*
1574  * Try to create the inline data for the new dir.
1575  * If it succeeds, return 0, otherwise return the error.
1576  * In case of ENOSPC, the caller should create the normal disk layout dir.
1577  */
1578 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1579 			       struct inode *inode)
1580 {
1581 	int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1582 	struct ext4_iloc iloc;
1583 	struct ext4_dir_entry_2 *de;
1584 
1585 	ret = ext4_get_inode_loc(inode, &iloc);
1586 	if (ret)
1587 		return ret;
1588 
1589 	ret = ext4_prepare_inline_data(handle, inode, inline_size);
1590 	if (ret)
1591 		goto out;
1592 
1593 	/*
1594 	 * For inline dir, we only save the inode information for the ".."
1595 	 * and create a fake dentry to cover the left space.
1596 	 */
1597 	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1598 	de->inode = cpu_to_le32(parent->i_ino);
1599 	de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1600 	de->inode = 0;
1601 	de->rec_len = ext4_rec_len_to_disk(
1602 				inline_size - EXT4_INLINE_DOTDOT_SIZE,
1603 				inline_size);
1604 	set_nlink(inode, 2);
1605 	inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1606 out:
1607 	brelse(iloc.bh);
1608 	return ret;
1609 }
1610 
1611 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1612 					struct ext4_filename *fname,
1613 					const struct qstr *d_name,
1614 					struct ext4_dir_entry_2 **res_dir,
1615 					int *has_inline_data)
1616 {
1617 	int ret;
1618 	struct ext4_iloc iloc;
1619 	void *inline_start;
1620 	int inline_size;
1621 
1622 	if (ext4_get_inode_loc(dir, &iloc))
1623 		return NULL;
1624 
1625 	down_read(&EXT4_I(dir)->xattr_sem);
1626 	if (!ext4_has_inline_data(dir)) {
1627 		*has_inline_data = 0;
1628 		goto out;
1629 	}
1630 
1631 	inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1632 						EXT4_INLINE_DOTDOT_SIZE;
1633 	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1634 	ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1635 			      dir, fname, d_name, 0, res_dir);
1636 	if (ret == 1)
1637 		goto out_find;
1638 	if (ret < 0)
1639 		goto out;
1640 
1641 	if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1642 		goto out;
1643 
1644 	inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1645 	inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1646 
1647 	ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1648 			      dir, fname, d_name, 0, res_dir);
1649 	if (ret == 1)
1650 		goto out_find;
1651 
1652 out:
1653 	brelse(iloc.bh);
1654 	iloc.bh = NULL;
1655 out_find:
1656 	up_read(&EXT4_I(dir)->xattr_sem);
1657 	return iloc.bh;
1658 }
1659 
1660 int ext4_delete_inline_entry(handle_t *handle,
1661 			     struct inode *dir,
1662 			     struct ext4_dir_entry_2 *de_del,
1663 			     struct buffer_head *bh,
1664 			     int *has_inline_data)
1665 {
1666 	int err, inline_size;
1667 	struct ext4_iloc iloc;
1668 	void *inline_start;
1669 
1670 	err = ext4_get_inode_loc(dir, &iloc);
1671 	if (err)
1672 		return err;
1673 
1674 	down_write(&EXT4_I(dir)->xattr_sem);
1675 	if (!ext4_has_inline_data(dir)) {
1676 		*has_inline_data = 0;
1677 		goto out;
1678 	}
1679 
1680 	if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1681 		EXT4_MIN_INLINE_DATA_SIZE) {
1682 		inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1683 					EXT4_INLINE_DOTDOT_SIZE;
1684 		inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1685 				EXT4_INLINE_DOTDOT_SIZE;
1686 	} else {
1687 		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1688 		inline_size = ext4_get_inline_size(dir) -
1689 				EXT4_MIN_INLINE_DATA_SIZE;
1690 	}
1691 
1692 	BUFFER_TRACE(bh, "get_write_access");
1693 	err = ext4_journal_get_write_access(handle, bh);
1694 	if (err)
1695 		goto out;
1696 
1697 	err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1698 					inline_start, inline_size, 0);
1699 	if (err)
1700 		goto out;
1701 
1702 	BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1703 	err = ext4_mark_inode_dirty(handle, dir);
1704 	if (unlikely(err))
1705 		goto out;
1706 
1707 	ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1708 out:
1709 	up_write(&EXT4_I(dir)->xattr_sem);
1710 	brelse(iloc.bh);
1711 	if (err != -ENOENT)
1712 		ext4_std_error(dir->i_sb, err);
1713 	return err;
1714 }
1715 
1716 /*
1717  * Get the inline dentry at offset.
1718  */
1719 static inline struct ext4_dir_entry_2 *
1720 ext4_get_inline_entry(struct inode *inode,
1721 		      struct ext4_iloc *iloc,
1722 		      unsigned int offset,
1723 		      void **inline_start,
1724 		      int *inline_size)
1725 {
1726 	void *inline_pos;
1727 
1728 	BUG_ON(offset > ext4_get_inline_size(inode));
1729 
1730 	if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1731 		inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1732 		*inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1733 	} else {
1734 		inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1735 		offset -= EXT4_MIN_INLINE_DATA_SIZE;
1736 		*inline_size = ext4_get_inline_size(inode) -
1737 				EXT4_MIN_INLINE_DATA_SIZE;
1738 	}
1739 
1740 	if (inline_start)
1741 		*inline_start = inline_pos;
1742 	return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1743 }
1744 
1745 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1746 {
1747 	int err, inline_size;
1748 	struct ext4_iloc iloc;
1749 	void *inline_pos;
1750 	unsigned int offset;
1751 	struct ext4_dir_entry_2 *de;
1752 	int ret = 1;
1753 
1754 	err = ext4_get_inode_loc(dir, &iloc);
1755 	if (err) {
1756 		EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1757 				 err, dir->i_ino);
1758 		return 1;
1759 	}
1760 
1761 	down_read(&EXT4_I(dir)->xattr_sem);
1762 	if (!ext4_has_inline_data(dir)) {
1763 		*has_inline_data = 0;
1764 		goto out;
1765 	}
1766 
1767 	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1768 	if (!le32_to_cpu(de->inode)) {
1769 		ext4_warning(dir->i_sb,
1770 			     "bad inline directory (dir #%lu) - no `..'",
1771 			     dir->i_ino);
1772 		ret = 1;
1773 		goto out;
1774 	}
1775 
1776 	offset = EXT4_INLINE_DOTDOT_SIZE;
1777 	while (offset < dir->i_size) {
1778 		de = ext4_get_inline_entry(dir, &iloc, offset,
1779 					   &inline_pos, &inline_size);
1780 		if (ext4_check_dir_entry(dir, NULL, de,
1781 					 iloc.bh, inline_pos,
1782 					 inline_size, offset)) {
1783 			ext4_warning(dir->i_sb,
1784 				     "bad inline directory (dir #%lu) - "
1785 				     "inode %u, rec_len %u, name_len %d"
1786 				     "inline size %d\n",
1787 				     dir->i_ino, le32_to_cpu(de->inode),
1788 				     le16_to_cpu(de->rec_len), de->name_len,
1789 				     inline_size);
1790 			ret = 1;
1791 			goto out;
1792 		}
1793 		if (le32_to_cpu(de->inode)) {
1794 			ret = 0;
1795 			goto out;
1796 		}
1797 		offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1798 	}
1799 
1800 out:
1801 	up_read(&EXT4_I(dir)->xattr_sem);
1802 	brelse(iloc.bh);
1803 	return ret;
1804 }
1805 
1806 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1807 {
1808 	int ret;
1809 
1810 	down_write(&EXT4_I(inode)->xattr_sem);
1811 	ret = ext4_destroy_inline_data_nolock(handle, inode);
1812 	up_write(&EXT4_I(inode)->xattr_sem);
1813 
1814 	return ret;
1815 }
1816 
1817 int ext4_inline_data_fiemap(struct inode *inode,
1818 			    struct fiemap_extent_info *fieinfo,
1819 			    int *has_inline, __u64 start, __u64 len)
1820 {
1821 	__u64 physical = 0;
1822 	__u64 inline_len;
1823 	__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1824 		FIEMAP_EXTENT_LAST;
1825 	int error = 0;
1826 	struct ext4_iloc iloc;
1827 
1828 	down_read(&EXT4_I(inode)->xattr_sem);
1829 	if (!ext4_has_inline_data(inode)) {
1830 		*has_inline = 0;
1831 		goto out;
1832 	}
1833 	inline_len = min_t(size_t, ext4_get_inline_size(inode),
1834 			   i_size_read(inode));
1835 	if (start >= inline_len)
1836 		goto out;
1837 	if (start + len < inline_len)
1838 		inline_len = start + len;
1839 	inline_len -= start;
1840 
1841 	error = ext4_get_inode_loc(inode, &iloc);
1842 	if (error)
1843 		goto out;
1844 
1845 	physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1846 	physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1847 	physical += offsetof(struct ext4_inode, i_block);
1848 
1849 	if (physical)
1850 		error = fiemap_fill_next_extent(fieinfo, start, physical,
1851 						inline_len, flags);
1852 	brelse(iloc.bh);
1853 out:
1854 	up_read(&EXT4_I(inode)->xattr_sem);
1855 	return (error < 0 ? error : 0);
1856 }
1857 
1858 /*
1859  * Called during xattr set, and if we can sparse space 'needed',
1860  * just create the extent tree evict the data to the outer block.
1861  *
1862  * We use jbd2 instead of page cache to move data to the 1st block
1863  * so that the whole transaction can be committed as a whole and
1864  * the data isn't lost because of the delayed page cache write.
1865  */
1866 int ext4_try_to_evict_inline_data(handle_t *handle,
1867 				  struct inode *inode,
1868 				  int needed)
1869 {
1870 	int error;
1871 	struct ext4_xattr_entry *entry;
1872 	struct ext4_inode *raw_inode;
1873 	struct ext4_iloc iloc;
1874 
1875 	error = ext4_get_inode_loc(inode, &iloc);
1876 	if (error)
1877 		return error;
1878 
1879 	raw_inode = ext4_raw_inode(&iloc);
1880 	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1881 					    EXT4_I(inode)->i_inline_off);
1882 	if (EXT4_XATTR_LEN(entry->e_name_len) +
1883 	    EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1884 		error = -ENOSPC;
1885 		goto out;
1886 	}
1887 
1888 	error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1889 out:
1890 	brelse(iloc.bh);
1891 	return error;
1892 }
1893 
1894 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1895 {
1896 	handle_t *handle;
1897 	int inline_size, value_len, needed_blocks;
1898 	size_t i_size;
1899 	void *value = NULL;
1900 	struct ext4_xattr_ibody_find is = {
1901 		.s = { .not_found = -ENODATA, },
1902 	};
1903 	struct ext4_xattr_info i = {
1904 		.name_index = EXT4_XATTR_INDEX_SYSTEM,
1905 		.name = EXT4_XATTR_SYSTEM_DATA,
1906 	};
1907 
1908 
1909 	needed_blocks = ext4_writepage_trans_blocks(inode);
1910 	handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1911 	if (IS_ERR(handle))
1912 		return;
1913 
1914 	down_write(&EXT4_I(inode)->xattr_sem);
1915 	if (!ext4_has_inline_data(inode)) {
1916 		*has_inline = 0;
1917 		ext4_journal_stop(handle);
1918 		return;
1919 	}
1920 
1921 	if (ext4_orphan_add(handle, inode))
1922 		goto out;
1923 
1924 	if (ext4_get_inode_loc(inode, &is.iloc))
1925 		goto out;
1926 
1927 	down_write(&EXT4_I(inode)->i_data_sem);
1928 	i_size = inode->i_size;
1929 	inline_size = ext4_get_inline_size(inode);
1930 	EXT4_I(inode)->i_disksize = i_size;
1931 
1932 	if (i_size < inline_size) {
1933 		/* Clear the content in the xattr space. */
1934 		if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1935 			if (ext4_xattr_ibody_find(inode, &i, &is))
1936 				goto out_error;
1937 
1938 			BUG_ON(is.s.not_found);
1939 
1940 			value_len = le32_to_cpu(is.s.here->e_value_size);
1941 			value = kmalloc(value_len, GFP_NOFS);
1942 			if (!value)
1943 				goto out_error;
1944 
1945 			if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1946 						value, value_len))
1947 				goto out_error;
1948 
1949 			i.value = value;
1950 			i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1951 					i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1952 			if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1953 				goto out_error;
1954 		}
1955 
1956 		/* Clear the content within i_blocks. */
1957 		if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1958 			void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1959 			memset(p + i_size, 0,
1960 			       EXT4_MIN_INLINE_DATA_SIZE - i_size);
1961 		}
1962 
1963 		EXT4_I(inode)->i_inline_size = i_size <
1964 					EXT4_MIN_INLINE_DATA_SIZE ?
1965 					EXT4_MIN_INLINE_DATA_SIZE : i_size;
1966 	}
1967 
1968 out_error:
1969 	up_write(&EXT4_I(inode)->i_data_sem);
1970 out:
1971 	brelse(is.iloc.bh);
1972 	up_write(&EXT4_I(inode)->xattr_sem);
1973 	kfree(value);
1974 	if (inode->i_nlink)
1975 		ext4_orphan_del(handle, inode);
1976 
1977 	inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1978 	ext4_mark_inode_dirty(handle, inode);
1979 	if (IS_SYNC(inode))
1980 		ext4_handle_sync(handle);
1981 
1982 	ext4_journal_stop(handle);
1983 	return;
1984 }
1985 
1986 int ext4_convert_inline_data(struct inode *inode)
1987 {
1988 	int error, needed_blocks;
1989 	handle_t *handle;
1990 	struct ext4_iloc iloc;
1991 
1992 	if (!ext4_has_inline_data(inode)) {
1993 		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1994 		return 0;
1995 	}
1996 
1997 	needed_blocks = ext4_writepage_trans_blocks(inode);
1998 
1999 	iloc.bh = NULL;
2000 	error = ext4_get_inode_loc(inode, &iloc);
2001 	if (error)
2002 		return error;
2003 
2004 	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2005 	if (IS_ERR(handle)) {
2006 		error = PTR_ERR(handle);
2007 		goto out_free;
2008 	}
2009 
2010 	down_write(&EXT4_I(inode)->xattr_sem);
2011 	if (!ext4_has_inline_data(inode)) {
2012 		up_write(&EXT4_I(inode)->xattr_sem);
2013 		goto out;
2014 	}
2015 
2016 	error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2017 	up_write(&EXT4_I(inode)->xattr_sem);
2018 out:
2019 	ext4_journal_stop(handle);
2020 out_free:
2021 	brelse(iloc.bh);
2022 	return error;
2023 }
2024