inline.c

   1// SPDX-License-Identifier: LGPL-2.1
   2/*
   3 * Copyright (c) 2012 Taobao.
   4 * Written by Tao Ma <boyu.mt@taobao.com>
   5 */
   6
   7#include <linux/iomap.h>
   8#include <linux/fiemap.h>
   9#include <linux/namei.h>
  10#include <linux/iversion.h>
  11#include <linux/sched/mm.h>
  12
  13#include "ext4_jbd2.h"
  14#include "ext4.h"
  15#include "xattr.h"
  16#include "truncate.h"
  17
  18#define EXT4_XATTR_SYSTEM_DATA	"data"
  19#define EXT4_MIN_INLINE_DATA_SIZE	((sizeof(__le32) * EXT4_N_BLOCKS))
  20#define EXT4_INLINE_DOTDOT_OFFSET	2
  21#define EXT4_INLINE_DOTDOT_SIZE		4
  22
  23
  24static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
  25						 struct inode *inode,
  26						 void **fsdata);
  27
  28static int ext4_get_inline_size(struct inode *inode)
  29{
  30	if (EXT4_I(inode)->i_inline_off)
  31		return EXT4_I(inode)->i_inline_size;
  32
  33	return 0;
  34}
  35
  36static int get_max_inline_xattr_value_size(struct inode *inode,
  37					   struct ext4_iloc *iloc)
  38{
  39	struct ext4_xattr_ibody_header *header;
  40	struct ext4_xattr_entry *entry;
  41	struct ext4_inode *raw_inode;
  42	void *end;
  43	int free, min_offs;
  44
  45	if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  46		return 0;
  47
  48	min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  49			EXT4_GOOD_OLD_INODE_SIZE -
  50			EXT4_I(inode)->i_extra_isize -
  51			sizeof(struct ext4_xattr_ibody_header);
  52
  53	/*
  54	 * We need to subtract another sizeof(__u32) since an in-inode xattr
  55	 * needs an empty 4 bytes to indicate the gap between the xattr entry
  56	 * and the name/value pair.
  57	 */
  58	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  59		return EXT4_XATTR_SIZE(min_offs -
  60			EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  61			EXT4_XATTR_ROUND - sizeof(__u32));
  62
  63	raw_inode = ext4_raw_inode(iloc);
  64	header = IHDR(inode, raw_inode);
  65	entry = IFIRST(header);
  66	end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
  67
  68	/* Compute min_offs. */
  69	while (!IS_LAST_ENTRY(entry)) {
  70		void *next = EXT4_XATTR_NEXT(entry);
  71
  72		if (next >= end) {
  73			EXT4_ERROR_INODE(inode,
  74					 "corrupt xattr in inline inode");
  75			return 0;
  76		}
  77		if (!entry->e_value_inum && entry->e_value_size) {
  78			size_t offs = le16_to_cpu(entry->e_value_offs);
  79			if (offs < min_offs)
  80				min_offs = offs;
  81		}
  82		entry = next;
  83	}
  84	free = min_offs -
  85		((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  86
  87	if (EXT4_I(inode)->i_inline_off) {
  88		entry = (struct ext4_xattr_entry *)
  89			((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  90
  91		free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  92		goto out;
  93	}
  94
  95	free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  96
  97	if (free > EXT4_XATTR_ROUND)
  98		free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  99	else
 100		free = 0;
 101
 102out:
 103	return free;
 104}
 105
 106/*
 107 * Get the maximum size we now can store in an inode.
 108 * If we can't find the space for a xattr entry, don't use the space
 109 * of the extents since we have no space to indicate the inline data.
 110 */
 111int ext4_get_max_inline_size(struct inode *inode)
 112{
 113	int error, max_inline_size;
 114	struct ext4_iloc iloc;
 115
 116	if (EXT4_I(inode)->i_extra_isize == 0)
 117		return 0;
 118
 119	error = ext4_get_inode_loc(inode, &iloc);
 120	if (error) {
 121		ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 122				     "can't get inode location %lu",
 123				     inode->i_ino);
 124		return 0;
 125	}
 126
 127	down_read(&EXT4_I(inode)->xattr_sem);
 128	max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 129	up_read(&EXT4_I(inode)->xattr_sem);
 130
 131	brelse(iloc.bh);
 132
 133	if (!max_inline_size)
 134		return 0;
 135
 136	return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 137}
 138
 139/*
 140 * this function does not take xattr_sem, which is OK because it is
 141 * currently only used in a code path coming form ext4_iget, before
 142 * the new inode has been unlocked
 143 */
 144int ext4_find_inline_data_nolock(struct inode *inode)
 145{
 146	struct ext4_xattr_ibody_find is = {
 147		.s = { .not_found = -ENODATA, },
 148	};
 149	struct ext4_xattr_info i = {
 150		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 151		.name = EXT4_XATTR_SYSTEM_DATA,
 152	};
 153	int error;
 154
 155	if (EXT4_I(inode)->i_extra_isize == 0)
 156		return 0;
 157
 158	error = ext4_get_inode_loc(inode, &is.iloc);
 159	if (error)
 160		return error;
 161
 162	error = ext4_xattr_ibody_find(inode, &i, &is);
 163	if (error)
 164		goto out;
 165
 166	if (!is.s.not_found) {
 167		if (is.s.here->e_value_inum) {
 168			EXT4_ERROR_INODE(inode, "inline data xattr refers "
 169					 "to an external xattr inode");
 170			error = -EFSCORRUPTED;
 171			goto out;
 172		}
 173		EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 174					(void *)ext4_raw_inode(&is.iloc));
 175		EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 176				le32_to_cpu(is.s.here->e_value_size);
 177	}
 178out:
 179	brelse(is.iloc.bh);
 180	return error;
 181}
 182
 183static int ext4_read_inline_data(struct inode *inode, void *buffer,
 184				 unsigned int len,
 185				 struct ext4_iloc *iloc)
 186{
 187	struct ext4_xattr_entry *entry;
 188	struct ext4_xattr_ibody_header *header;
 189	int cp_len = 0;
 190	struct ext4_inode *raw_inode;
 191
 192	if (!len)
 193		return 0;
 194
 195	BUG_ON(len > EXT4_I(inode)->i_inline_size);
 196
 197	cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
 198
 199	raw_inode = ext4_raw_inode(iloc);
 200	memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 201
 202	len -= cp_len;
 203	buffer += cp_len;
 204
 205	if (!len)
 206		goto out;
 207
 208	header = IHDR(inode, raw_inode);
 209	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 210					    EXT4_I(inode)->i_inline_off);
 211	len = min_t(unsigned int, len,
 212		    (unsigned int)le32_to_cpu(entry->e_value_size));
 213
 214	memcpy(buffer,
 215	       (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 216	cp_len += len;
 217
 218out:
 219	return cp_len;
 220}
 221
 222/*
 223 * write the buffer to the inline inode.
 224 * If 'create' is set, we don't need to do the extra copy in the xattr
 225 * value since it is already handled by ext4_xattr_ibody_set.
 226 * That saves us one memcpy.
 227 */
 228static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 229				   void *buffer, loff_t pos, unsigned int len)
 230{
 231	struct ext4_xattr_entry *entry;
 232	struct ext4_xattr_ibody_header *header;
 233	struct ext4_inode *raw_inode;
 234	int cp_len = 0;
 235
 236	if (unlikely(ext4_emergency_state(inode->i_sb)))
 237		return;
 238
 239	BUG_ON(!EXT4_I(inode)->i_inline_off);
 240	BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 241
 242	raw_inode = ext4_raw_inode(iloc);
 243	buffer += pos;
 244
 245	if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 246		cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 247			 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 248		memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 249
 250		len -= cp_len;
 251		buffer += cp_len;
 252		pos += cp_len;
 253	}
 254
 255	if (!len)
 256		return;
 257
 258	pos -= EXT4_MIN_INLINE_DATA_SIZE;
 259	header = IHDR(inode, raw_inode);
 260	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 261					    EXT4_I(inode)->i_inline_off);
 262
 263	memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 264	       buffer, len);
 265}
 266
 267static int ext4_create_inline_data(handle_t *handle,
 268				   struct inode *inode, unsigned len)
 269{
 270	int error;
 271	void *value = NULL;
 272	struct ext4_xattr_ibody_find is = {
 273		.s = { .not_found = -ENODATA, },
 274	};
 275	struct ext4_xattr_info i = {
 276		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 277		.name = EXT4_XATTR_SYSTEM_DATA,
 278	};
 279
 280	error = ext4_get_inode_loc(inode, &is.iloc);
 281	if (error)
 282		return error;
 283
 284	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 285	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 286					      EXT4_JTR_NONE);
 287	if (error)
 288		goto out;
 289
 290	if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 291		value = EXT4_ZERO_XATTR_VALUE;
 292		len -= EXT4_MIN_INLINE_DATA_SIZE;
 293	} else {
 294		value = "";
 295		len = 0;
 296	}
 297
 298	/* Insert the xttr entry. */
 299	i.value = value;
 300	i.value_len = len;
 301
 302	error = ext4_xattr_ibody_find(inode, &i, &is);
 303	if (error)
 304		goto out;
 305
 306	if (!is.s.not_found) {
 307		EXT4_ERROR_INODE(inode, "unexpected inline data xattr");
 308		error = -EFSCORRUPTED;
 309		goto out;
 310	}
 311
 312	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 313	if (error) {
 314		if (error == -ENOSPC)
 315			ext4_clear_inode_state(inode,
 316					       EXT4_STATE_MAY_INLINE_DATA);
 317		goto out;
 318	}
 319
 320	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 321		0, EXT4_MIN_INLINE_DATA_SIZE);
 322
 323	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 324				      (void *)ext4_raw_inode(&is.iloc));
 325	EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 326	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 327	ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 328	get_bh(is.iloc.bh);
 329	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 330
 331out:
 332	brelse(is.iloc.bh);
 333	return error;
 334}
 335
 336static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 337				   unsigned int len)
 338{
 339	int error;
 340	void *value = NULL;
 341	struct ext4_xattr_ibody_find is = {
 342		.s = { .not_found = -ENODATA, },
 343	};
 344	struct ext4_xattr_info i = {
 345		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 346		.name = EXT4_XATTR_SYSTEM_DATA,
 347	};
 348
 349	/* If the old space is ok, write the data directly. */
 350	if (len <= EXT4_I(inode)->i_inline_size)
 351		return 0;
 352
 353	error = ext4_get_inode_loc(inode, &is.iloc);
 354	if (error)
 355		return error;
 356
 357	error = ext4_xattr_ibody_find(inode, &i, &is);
 358	if (error)
 359		goto out;
 360
 361	if (is.s.not_found) {
 362		EXT4_ERROR_INODE(inode, "missing inline data xattr");
 363		error = -EFSCORRUPTED;
 364		goto out;
 365	}
 366
 367	len -= EXT4_MIN_INLINE_DATA_SIZE;
 368	value = kzalloc(len, GFP_NOFS);
 369	if (!value) {
 370		error = -ENOMEM;
 371		goto out;
 372	}
 373
 374	error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 375				     value, len);
 376	if (error < 0)
 377		goto out;
 378
 379	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 380	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 381					      EXT4_JTR_NONE);
 382	if (error)
 383		goto out;
 384
 385	/* Update the xattr entry. */
 386	i.value = value;
 387	i.value_len = len;
 388
 389	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 390	if (error)
 391		goto out;
 392
 393	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 394				      (void *)ext4_raw_inode(&is.iloc));
 395	EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 396				le32_to_cpu(is.s.here->e_value_size);
 397	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 398	get_bh(is.iloc.bh);
 399	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 400
 401out:
 402	kfree(value);
 403	brelse(is.iloc.bh);
 404	return error;
 405}
 406
 407static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 408				    loff_t len)
 409{
 410	int ret, size, no_expand;
 411	struct ext4_inode_info *ei = EXT4_I(inode);
 412
 413	if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 414		return -ENOSPC;
 415
 416	size = ext4_get_max_inline_size(inode);
 417	if (size < len)
 418		return -ENOSPC;
 419
 420	ext4_write_lock_xattr(inode, &no_expand);
 421	/*
 422	 * ei->i_inline_size may have changed since the initial check
 423	 * if other xattrs were added. Recalculate to ensure
 424	 * ext4_update_inline_data() validates against current capacity.
 425	 */
 426	(void) ext4_find_inline_data_nolock(inode);
 427	if (ei->i_inline_off)
 428		ret = ext4_update_inline_data(handle, inode, len);
 429	else
 430		ret = ext4_create_inline_data(handle, inode, len);
 431
 432	ext4_write_unlock_xattr(inode, &no_expand);
 433	return ret;
 434}
 435
 436static int ext4_destroy_inline_data_nolock(handle_t *handle,
 437					   struct inode *inode)
 438{
 439	struct ext4_inode_info *ei = EXT4_I(inode);
 440	struct ext4_xattr_ibody_find is = {
 441		.s = { .not_found = 0, },
 442	};
 443	struct ext4_xattr_info i = {
 444		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 445		.name = EXT4_XATTR_SYSTEM_DATA,
 446		.value = NULL,
 447		.value_len = 0,
 448	};
 449	int error;
 450
 451	if (!ei->i_inline_off)
 452		return 0;
 453
 454	down_write(&ei->i_data_sem);
 455
 456	error = ext4_get_inode_loc(inode, &is.iloc);
 457	if (error) {
 458		up_write(&ei->i_data_sem);
 459		return error;
 460	}
 461
 462	error = ext4_xattr_ibody_find(inode, &i, &is);
 463	if (error)
 464		goto out;
 465
 466	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 467	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 468					      EXT4_JTR_NONE);
 469	if (error)
 470		goto out;
 471
 472	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 473	if (error)
 474		goto out;
 475
 476	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 477		0, EXT4_MIN_INLINE_DATA_SIZE);
 478	memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 479
 480	if (ext4_has_feature_extents(inode->i_sb)) {
 481		if (S_ISDIR(inode->i_mode) ||
 482		    S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 483			ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 484			ext4_ext_tree_init(handle, inode);
 485		}
 486	}
 487	ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 488
 489	get_bh(is.iloc.bh);
 490	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 491
 492	EXT4_I(inode)->i_inline_off = 0;
 493	EXT4_I(inode)->i_inline_size = 0;
 494	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 495out:
 496	brelse(is.iloc.bh);
 497	if (error == -ENODATA)
 498		error = 0;
 499	up_write(&ei->i_data_sem);
 500	return error;
 501}
 502
 503static int ext4_read_inline_folio(struct inode *inode, struct folio *folio)
 504{
 505	void *kaddr;
 506	int ret = 0;
 507	size_t len;
 508	struct ext4_iloc iloc;
 509
 510	BUG_ON(!folio_test_locked(folio));
 511	BUG_ON(!ext4_has_inline_data(inode));
 512	BUG_ON(folio->index);
 513
 514	if (!EXT4_I(inode)->i_inline_off) {
 515		ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 516			     inode->i_ino);
 517		goto out;
 518	}
 519
 520	ret = ext4_get_inode_loc(inode, &iloc);
 521	if (ret)
 522		goto out;
 523
 524	len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 525
 526	if (len > PAGE_SIZE) {
 527		ext4_error_inode(inode, __func__, __LINE__, 0,
 528				 "inline size %zu exceeds PAGE_SIZE", len);
 529		ret = -EFSCORRUPTED;
 530		brelse(iloc.bh);
 531		goto out;
 532	}
 533
 534	kaddr = kmap_local_folio(folio, 0);
 535	ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 536	kaddr = folio_zero_tail(folio, len, kaddr + len);
 537	kunmap_local(kaddr);
 538	folio_mark_uptodate(folio);
 539	brelse(iloc.bh);
 540
 541out:
 542	return ret;
 543}
 544
 545int ext4_readpage_inline(struct inode *inode, struct folio *folio)
 546{
 547	int ret = 0;
 548
 549	down_read(&EXT4_I(inode)->xattr_sem);
 550	if (!ext4_has_inline_data(inode)) {
 551		up_read(&EXT4_I(inode)->xattr_sem);
 552		return -EAGAIN;
 553	}
 554
 555	/*
 556	 * Current inline data can only exist in the 1st page,
 557	 * So for all the other pages, just set them uptodate.
 558	 */
 559	if (!folio->index)
 560		ret = ext4_read_inline_folio(inode, folio);
 561	else if (!folio_test_uptodate(folio)) {
 562		folio_zero_segment(folio, 0, folio_size(folio));
 563		folio_mark_uptodate(folio);
 564	}
 565
 566	up_read(&EXT4_I(inode)->xattr_sem);
 567
 568	folio_unlock(folio);
 569	return ret >= 0 ? 0 : ret;
 570}
 571
 572static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 573					      struct inode *inode)
 574{
 575	int ret, needed_blocks, no_expand;
 576	handle_t *handle = NULL;
 577	int retries = 0, sem_held = 0;
 578	struct folio *folio = NULL;
 579	unsigned from, to;
 580	struct ext4_iloc iloc;
 581
 582	if (!ext4_has_inline_data(inode)) {
 583		/*
 584		 * clear the flag so that no new write
 585		 * will trap here again.
 586		 */
 587		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 588		return 0;
 589	}
 590
 591	needed_blocks = ext4_chunk_trans_extent(inode, 1);
 592
 593	ret = ext4_get_inode_loc(inode, &iloc);
 594	if (ret)
 595		return ret;
 596
 597retry:
 598	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 599	if (IS_ERR(handle)) {
 600		ret = PTR_ERR(handle);
 601		handle = NULL;
 602		goto out;
 603	}
 604
 605	/* We cannot recurse into the filesystem as the transaction is already
 606	 * started */
 607	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 608			mapping_gfp_mask(mapping));
 609	if (IS_ERR(folio)) {
 610		ret = PTR_ERR(folio);
 611		goto out_nofolio;
 612	}
 613
 614	ext4_write_lock_xattr(inode, &no_expand);
 615	sem_held = 1;
 616	/* If some one has already done this for us, just exit. */
 617	if (!ext4_has_inline_data(inode)) {
 618		ret = 0;
 619		goto out;
 620	}
 621
 622	from = 0;
 623	to = ext4_get_inline_size(inode);
 624	if (!folio_test_uptodate(folio)) {
 625		ret = ext4_read_inline_folio(inode, folio);
 626		if (ret < 0)
 627			goto out;
 628	}
 629
 630	ext4_fc_track_inode(handle, inode);
 631	ret = ext4_destroy_inline_data_nolock(handle, inode);
 632	if (ret)
 633		goto out;
 634
 635	if (ext4_should_dioread_nolock(inode)) {
 636		ret = ext4_block_write_begin(handle, folio, from, to,
 637					     ext4_get_block_unwritten);
 638	} else
 639		ret = ext4_block_write_begin(handle, folio, from, to,
 640					     ext4_get_block);
 641	clear_buffer_new(folio_buffers(folio));
 642
 643	if (!ret && ext4_should_journal_data(inode)) {
 644		ret = ext4_walk_page_buffers(handle, inode,
 645					     folio_buffers(folio), from, to,
 646					     NULL, do_journal_get_write_access);
 647	}
 648
 649	if (ret) {
 650		folio_unlock(folio);
 651		folio_put(folio);
 652		folio = NULL;
 653		ext4_orphan_add(handle, inode);
 654		ext4_write_unlock_xattr(inode, &no_expand);
 655		sem_held = 0;
 656		ext4_journal_stop(handle);
 657		handle = NULL;
 658		ext4_truncate_failed_write(inode);
 659		/*
 660		 * If truncate failed early the inode might
 661		 * still be on the orphan list; we need to
 662		 * make sure the inode is removed from the
 663		 * orphan list in that case.
 664		 */
 665		if (inode->i_nlink)
 666			ext4_orphan_del(NULL, inode);
 667	}
 668
 669	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 670		goto retry;
 671
 672	if (folio)
 673		block_commit_write(folio, from, to);
 674out:
 675	if (folio) {
 676		folio_unlock(folio);
 677		folio_put(folio);
 678	}
 679out_nofolio:
 680	if (sem_held)
 681		ext4_write_unlock_xattr(inode, &no_expand);
 682	if (handle)
 683		ext4_journal_stop(handle);
 684	brelse(iloc.bh);
 685	return ret;
 686}
 687
 688/*
 689 * Prepare the write for the inline data.
 690 * If the data can be written into the inode, we just read
 691 * the page and make it uptodate, and start the journal.
 692 * Otherwise read the page, makes it dirty so that it can be
 693 * handle in writepages(the i_disksize update is left to the
 694 * normal ext4_da_write_end).
 695 */
 696int ext4_generic_write_inline_data(struct address_space *mapping,
 697					  struct inode *inode,
 698					  loff_t pos, unsigned len,
 699					  struct folio **foliop,
 700					  void **fsdata, bool da)
 701{
 702	int ret;
 703	handle_t *handle;
 704	struct folio *folio;
 705	struct ext4_iloc iloc;
 706	int retries = 0;
 707
 708	ret = ext4_get_inode_loc(inode, &iloc);
 709	if (ret)
 710		return ret;
 711
 712retry_journal:
 713	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 714	if (IS_ERR(handle)) {
 715		ret = PTR_ERR(handle);
 716		goto out_release_bh;
 717	}
 718
 719	ret = ext4_prepare_inline_data(handle, inode, pos + len);
 720	if (ret && ret != -ENOSPC)
 721		goto out_stop_journal;
 722
 723	if (ret == -ENOSPC) {
 724		ext4_journal_stop(handle);
 725		if (!da) {
 726			brelse(iloc.bh);
 727			/* Retry inside */
 728			return ext4_convert_inline_data_to_extent(mapping, inode);
 729		}
 730
 731		ret = ext4_da_convert_inline_data_to_extent(mapping, inode, fsdata);
 732		if (ret == -ENOSPC &&
 733		    ext4_should_retry_alloc(inode->i_sb, &retries))
 734			goto retry_journal;
 735		goto out_release_bh;
 736	}
 737
 738	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 739					mapping_gfp_mask(mapping));
 740	if (IS_ERR(folio)) {
 741		ret = PTR_ERR(folio);
 742		goto out_stop_journal;
 743	}
 744
 745	down_read(&EXT4_I(inode)->xattr_sem);
 746	/* Someone else had converted it to extent */
 747	if (!ext4_has_inline_data(inode)) {
 748		ret = 0;
 749		goto out_release_folio;
 750	}
 751
 752	if (!folio_test_uptodate(folio)) {
 753		ret = ext4_read_inline_folio(inode, folio);
 754		if (ret < 0)
 755			goto out_release_folio;
 756	}
 757
 758	ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh, EXT4_JTR_NONE);
 759	if (ret)
 760		goto out_release_folio;
 761	*foliop = folio;
 762	up_read(&EXT4_I(inode)->xattr_sem);
 763	brelse(iloc.bh);
 764	return 1;
 765
 766out_release_folio:
 767	up_read(&EXT4_I(inode)->xattr_sem);
 768	folio_unlock(folio);
 769	folio_put(folio);
 770out_stop_journal:
 771	ext4_journal_stop(handle);
 772out_release_bh:
 773	brelse(iloc.bh);
 774	return ret;
 775}
 776
 777/*
 778 * Try to write data in the inode.
 779 * If the inode has inline data, check whether the new write can be
 780 * in the inode also. If not, create the page the handle, move the data
 781 * to the page make it update and let the later codes create extent for it.
 782 */
 783int ext4_try_to_write_inline_data(struct address_space *mapping,
 784				  struct inode *inode,
 785				  loff_t pos, unsigned len,
 786				  struct folio **foliop)
 787{
 788	if (pos + len > ext4_get_max_inline_size(inode))
 789		return ext4_convert_inline_data_to_extent(mapping, inode);
 790	return ext4_generic_write_inline_data(mapping, inode, pos, len,
 791					      foliop, NULL, false);
 792}
 793
 794int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 795			       unsigned copied, struct folio *folio)
 796{
 797	handle_t *handle = ext4_journal_current_handle();
 798	int no_expand;
 799	void *kaddr;
 800	struct ext4_iloc iloc;
 801	int ret = 0, ret2;
 802
 803	if (unlikely(copied < len) && !folio_test_uptodate(folio))
 804		copied = 0;
 805
 806	if (likely(copied)) {
 807		ret = ext4_get_inode_loc(inode, &iloc);
 808		if (ret) {
 809			folio_unlock(folio);
 810			folio_put(folio);
 811			ext4_std_error(inode->i_sb, ret);
 812			goto out;
 813		}
 814		ext4_write_lock_xattr(inode, &no_expand);
 815		BUG_ON(!ext4_has_inline_data(inode));
 816
 817		/*
 818		 * ei->i_inline_off may have changed since
 819		 * ext4_write_begin() called
 820		 * ext4_try_to_write_inline_data()
 821		 */
 822		(void) ext4_find_inline_data_nolock(inode);
 823
 824		kaddr = kmap_local_folio(folio, 0);
 825		ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 826		kunmap_local(kaddr);
 827		folio_mark_uptodate(folio);
 828		/* clear dirty flag so that writepages wouldn't work for us. */
 829		folio_clear_dirty(folio);
 830
 831		ext4_write_unlock_xattr(inode, &no_expand);
 832		brelse(iloc.bh);
 833
 834		/*
 835		 * It's important to update i_size while still holding folio
 836		 * lock: page writeout could otherwise come in and zero
 837		 * beyond i_size.
 838		 */
 839		ext4_update_inode_size(inode, pos + copied);
 840	}
 841	folio_unlock(folio);
 842	folio_put(folio);
 843
 844	/*
 845	 * Don't mark the inode dirty under folio lock. First, it unnecessarily
 846	 * makes the holding time of folio lock longer. Second, it forces lock
 847	 * ordering of folio lock and transaction start for journaling
 848	 * filesystems.
 849	 */
 850	if (likely(copied))
 851		mark_inode_dirty(inode);
 852out:
 853	/*
 854	 * If we didn't copy as much data as expected, we need to trim back
 855	 * size of xattr containing inline data.
 856	 */
 857	if (pos + len > inode->i_size && ext4_can_truncate(inode))
 858		ext4_orphan_add(handle, inode);
 859
 860	ret2 = ext4_journal_stop(handle);
 861	if (!ret)
 862		ret = ret2;
 863	if (pos + len > inode->i_size) {
 864		ext4_truncate_failed_write(inode);
 865		/*
 866		 * If truncate failed early the inode might still be
 867		 * on the orphan list; we need to make sure the inode
 868		 * is removed from the orphan list in that case.
 869		 */
 870		if (inode->i_nlink)
 871			ext4_orphan_del(NULL, inode);
 872	}
 873	return ret ? ret : copied;
 874}
 875
 876/*
 877 * Try to make the page cache and handle ready for the inline data case.
 878 * We can call this function in 2 cases:
 879 * 1. The inode is created and the first write exceeds inline size. We can
 880 *    clear the inode state safely.
 881 * 2. The inode has inline data, then we need to read the data, make it
 882 *    update and dirty so that ext4_da_writepages can handle it. We don't
 883 *    need to start the journal since the file's metadata isn't changed now.
 884 */
 885static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 886						 struct inode *inode,
 887						 void **fsdata)
 888{
 889	int ret = 0, inline_size;
 890	struct folio *folio;
 891
 892	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 893					mapping_gfp_mask(mapping));
 894	if (IS_ERR(folio))
 895		return PTR_ERR(folio);
 896
 897	down_read(&EXT4_I(inode)->xattr_sem);
 898	if (!ext4_has_inline_data(inode)) {
 899		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 900		goto out;
 901	}
 902
 903	inline_size = ext4_get_inline_size(inode);
 904
 905	if (!folio_test_uptodate(folio)) {
 906		ret = ext4_read_inline_folio(inode, folio);
 907		if (ret < 0)
 908			goto out;
 909	}
 910
 911	ret = ext4_block_write_begin(NULL, folio, 0, inline_size,
 912				     ext4_da_get_block_prep);
 913	if (ret) {
 914		up_read(&EXT4_I(inode)->xattr_sem);
 915		folio_unlock(folio);
 916		folio_put(folio);
 917		ext4_truncate_failed_write(inode);
 918		return ret;
 919	}
 920
 921	clear_buffer_new(folio_buffers(folio));
 922	folio_mark_dirty(folio);
 923	folio_mark_uptodate(folio);
 924	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 925	*fsdata = (void *)CONVERT_INLINE_DATA;
 926
 927out:
 928	up_read(&EXT4_I(inode)->xattr_sem);
 929	if (folio) {
 930		folio_unlock(folio);
 931		folio_put(folio);
 932	}
 933	return ret;
 934}
 935
 936#ifdef INLINE_DIR_DEBUG
 937void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 938			  void *inline_start, int inline_size)
 939{
 940	int offset;
 941	unsigned short de_len;
 942	struct ext4_dir_entry_2 *de = inline_start;
 943	void *dlimit = inline_start + inline_size;
 944
 945	trace_printk("inode %lu\n", dir->i_ino);
 946	offset = 0;
 947	while ((void *)de < dlimit) {
 948		de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 949		trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 950			     offset, de_len, de->name_len, de->name,
 951			     de->name_len, le32_to_cpu(de->inode));
 952		if (ext4_check_dir_entry(dir, NULL, de, bh,
 953					 inline_start, inline_size, offset))
 954			BUG();
 955
 956		offset += de_len;
 957		de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 958	}
 959}
 960#else
 961#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 962#endif
 963
 964/*
 965 * Add a new entry into a inline dir.
 966 * It will return -ENOSPC if no space is available, and -EIO
 967 * and -EEXIST if directory entry already exists.
 968 */
 969static int ext4_add_dirent_to_inline(handle_t *handle,
 970				     struct ext4_filename *fname,
 971				     struct inode *dir,
 972				     struct inode *inode,
 973				     struct ext4_iloc *iloc,
 974				     void *inline_start, int inline_size)
 975{
 976	int		err;
 977	struct ext4_dir_entry_2 *de;
 978
 979	err = ext4_find_dest_de(dir, iloc->bh, inline_start,
 980				inline_size, fname, &de);
 981	if (err)
 982		return err;
 983
 984	BUFFER_TRACE(iloc->bh, "get_write_access");
 985	err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
 986					    EXT4_JTR_NONE);
 987	if (err)
 988		return err;
 989	ext4_insert_dentry(dir, inode, de, inline_size, fname);
 990
 991	ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
 992
 993	/*
 994	 * XXX shouldn't update any times until successful
 995	 * completion of syscall, but too many callers depend
 996	 * on this.
 997	 *
 998	 * XXX similarly, too many callers depend on
 999	 * ext4_new_inode() setting the times, but error
1000	 * recovery deletes the inode, so the worst that can
1001	 * happen is that the times are slightly out of date
1002	 * and/or different from the directory change time.
1003	 */
1004	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1005	ext4_update_dx_flag(dir);
1006	inode_inc_iversion(dir);
1007	return 1;
1008}
1009
1010static void *ext4_get_inline_xattr_pos(struct inode *inode,
1011				       struct ext4_iloc *iloc)
1012{
1013	struct ext4_xattr_entry *entry;
1014	struct ext4_xattr_ibody_header *header;
1015
1016	BUG_ON(!EXT4_I(inode)->i_inline_off);
1017
1018	header = IHDR(inode, ext4_raw_inode(iloc));
1019	entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1020					    EXT4_I(inode)->i_inline_off);
1021
1022	return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1023}
1024
1025/* Set the final de to cover the whole block. */
1026void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1027{
1028	struct ext4_dir_entry_2 *de, *prev_de;
1029	void *limit;
1030	int de_len;
1031
1032	de = de_buf;
1033	if (old_size) {
1034		limit = de_buf + old_size;
1035		do {
1036			prev_de = de;
1037			de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1038			de_buf += de_len;
1039			de = de_buf;
1040		} while (de_buf < limit);
1041
1042		prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1043							old_size, new_size);
1044	} else {
1045		/* this is just created, so create an empty entry. */
1046		de->inode = 0;
1047		de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1048	}
1049}
1050
1051static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1052				  struct ext4_iloc *iloc)
1053{
1054	int ret;
1055	int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1056	int new_size = get_max_inline_xattr_value_size(dir, iloc);
1057
1058	if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1059		return -ENOSPC;
1060
1061	ret = ext4_update_inline_data(handle, dir,
1062				      new_size + EXT4_MIN_INLINE_DATA_SIZE);
1063	if (ret)
1064		return ret;
1065
1066	ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1067			     EXT4_I(dir)->i_inline_size -
1068						EXT4_MIN_INLINE_DATA_SIZE);
1069	dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1070	return 0;
1071}
1072
1073static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1074				     struct ext4_iloc *iloc,
1075				     void *buf, int inline_size)
1076{
1077	int ret;
1078
1079	ret = ext4_create_inline_data(handle, inode, inline_size);
1080	if (ret) {
1081		ext4_msg(inode->i_sb, KERN_EMERG,
1082			"error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1083			inode->i_ino, ret);
1084		return;
1085	}
1086	ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1087	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1088}
1089
1090static int ext4_convert_inline_data_nolock(handle_t *handle,
1091					   struct inode *inode,
1092					   struct ext4_iloc *iloc)
1093{
1094	int error;
1095	void *buf = NULL;
1096	struct buffer_head *data_bh = NULL;
1097	struct ext4_map_blocks map;
1098	int inline_size;
1099
1100	inline_size = ext4_get_inline_size(inode);
1101	buf = kmalloc(inline_size, GFP_NOFS);
1102	if (!buf) {
1103		error = -ENOMEM;
1104		goto out;
1105	}
1106
1107	error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1108	if (error < 0)
1109		goto out;
1110
1111	/*
1112	 * Make sure the inline directory entries pass checks before we try to
1113	 * convert them, so that we avoid touching stuff that needs fsck.
1114	 */
1115	if (S_ISDIR(inode->i_mode)) {
1116		error = ext4_check_all_de(inode, iloc->bh,
1117					buf + EXT4_INLINE_DOTDOT_SIZE,
1118					inline_size - EXT4_INLINE_DOTDOT_SIZE);
1119		if (error)
1120			goto out;
1121	}
1122
1123	error = ext4_destroy_inline_data_nolock(handle, inode);
1124	if (error)
1125		goto out;
1126
1127	map.m_lblk = 0;
1128	map.m_len = 1;
1129	map.m_flags = 0;
1130	error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1131	if (error < 0)
1132		goto out_restore;
1133	if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1134		error = -EIO;
1135		goto out_restore;
1136	}
1137
1138	data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1139	if (!data_bh) {
1140		error = -ENOMEM;
1141		goto out_restore;
1142	}
1143
1144	lock_buffer(data_bh);
1145	error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1146					       EXT4_JTR_NONE);
1147	if (error) {
1148		unlock_buffer(data_bh);
1149		error = -EIO;
1150		goto out_restore;
1151	}
1152	memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1153
1154	if (!S_ISDIR(inode->i_mode)) {
1155		memcpy(data_bh->b_data, buf, inline_size);
1156		set_buffer_uptodate(data_bh);
1157		unlock_buffer(data_bh);
1158		error = ext4_handle_dirty_metadata(handle,
1159						   inode, data_bh);
1160	} else {
1161		unlock_buffer(data_bh);
1162		inode->i_size = inode->i_sb->s_blocksize;
1163		i_size_write(inode, inode->i_sb->s_blocksize);
1164		EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1165
1166		error = ext4_init_dirblock(handle, inode, data_bh,
1167			  le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode),
1168			  buf + EXT4_INLINE_DOTDOT_SIZE,
1169			  inline_size - EXT4_INLINE_DOTDOT_SIZE);
1170		if (!error)
1171			error = ext4_mark_inode_dirty(handle, inode);
1172	}
1173
1174out_restore:
1175	if (error)
1176		ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1177
1178out:
1179	brelse(data_bh);
1180	kfree(buf);
1181	return error;
1182}
1183
1184/*
1185 * Try to add the new entry to the inline data.
1186 * If succeeds, return 0. If not, extended the inline dir and copied data to
1187 * the new created block.
1188 */
1189int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1190			      struct inode *dir, struct inode *inode)
1191{
1192	int ret, ret2, inline_size, no_expand;
1193	void *inline_start;
1194	struct ext4_iloc iloc;
1195
1196	ret = ext4_get_inode_loc(dir, &iloc);
1197	if (ret)
1198		return ret;
1199
1200	ext4_write_lock_xattr(dir, &no_expand);
1201	if (!ext4_has_inline_data(dir))
1202		goto out;
1203
1204	inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1205						 EXT4_INLINE_DOTDOT_SIZE;
1206	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1207
1208	ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1209					inline_start, inline_size);
1210	if (ret != -ENOSPC)
1211		goto out;
1212
1213	/* check whether it can be inserted to inline xattr space. */
1214	inline_size = EXT4_I(dir)->i_inline_size -
1215			EXT4_MIN_INLINE_DATA_SIZE;
1216	if (!inline_size) {
1217		/* Try to use the xattr space.*/
1218		ret = ext4_update_inline_dir(handle, dir, &iloc);
1219		if (ret && ret != -ENOSPC)
1220			goto out;
1221
1222		inline_size = EXT4_I(dir)->i_inline_size -
1223				EXT4_MIN_INLINE_DATA_SIZE;
1224	}
1225
1226	if (inline_size) {
1227		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1228
1229		ret = ext4_add_dirent_to_inline(handle, fname, dir,
1230						inode, &iloc, inline_start,
1231						inline_size);
1232
1233		if (ret != -ENOSPC)
1234			goto out;
1235	}
1236
1237	/*
1238	 * The inline space is filled up, so create a new block for it.
1239	 * As the extent tree will be created, we have to save the inline
1240	 * dir first.
1241	 */
1242	ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1243
1244out:
1245	ext4_write_unlock_xattr(dir, &no_expand);
1246	ret2 = ext4_mark_inode_dirty(handle, dir);
1247	if (unlikely(ret2 && !ret))
1248		ret = ret2;
1249	brelse(iloc.bh);
1250	return ret;
1251}
1252
1253/*
1254 * This function fills a red-black tree with information from an
1255 * inlined dir.  It returns the number directory entries loaded
1256 * into the tree.  If there is an error it is returned in err.
1257 */
1258int ext4_inlinedir_to_tree(struct file *dir_file,
1259			   struct inode *dir, ext4_lblk_t block,
1260			   struct dx_hash_info *hinfo,
1261			   __u32 start_hash, __u32 start_minor_hash,
1262			   int *has_inline_data)
1263{
1264	int err = 0, count = 0;
1265	unsigned int parent_ino;
1266	int pos;
1267	struct ext4_dir_entry_2 *de;
1268	struct inode *inode = file_inode(dir_file);
1269	int ret, inline_size = 0;
1270	struct ext4_iloc iloc;
1271	void *dir_buf = NULL;
1272	struct ext4_dir_entry_2 fake;
1273	struct fscrypt_str tmp_str;
1274
1275	ret = ext4_get_inode_loc(inode, &iloc);
1276	if (ret)
1277		return ret;
1278
1279	down_read(&EXT4_I(inode)->xattr_sem);
1280	if (!ext4_has_inline_data(inode)) {
1281		up_read(&EXT4_I(inode)->xattr_sem);
1282		*has_inline_data = 0;
1283		goto out;
1284	}
1285
1286	inline_size = ext4_get_inline_size(inode);
1287	dir_buf = kmalloc(inline_size, GFP_NOFS);
1288	if (!dir_buf) {
1289		ret = -ENOMEM;
1290		up_read(&EXT4_I(inode)->xattr_sem);
1291		goto out;
1292	}
1293
1294	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1295	up_read(&EXT4_I(inode)->xattr_sem);
1296	if (ret < 0)
1297		goto out;
1298
1299	pos = 0;
1300	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1301	while (pos < inline_size) {
1302		/*
1303		 * As inlined dir doesn't store any information about '.' and
1304		 * only the inode number of '..' is stored, we have to handle
1305		 * them differently.
1306		 */
1307		if (pos == 0) {
1308			fake.inode = cpu_to_le32(inode->i_ino);
1309			fake.name_len = 1;
1310			memcpy(fake.name, ".", 2);
1311			fake.rec_len = ext4_rec_len_to_disk(
1312					  ext4_dir_rec_len(fake.name_len, NULL),
1313					  inline_size);
1314			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1315			de = &fake;
1316			pos = EXT4_INLINE_DOTDOT_OFFSET;
1317		} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1318			fake.inode = cpu_to_le32(parent_ino);
1319			fake.name_len = 2;
1320			memcpy(fake.name, "..", 3);
1321			fake.rec_len = ext4_rec_len_to_disk(
1322					  ext4_dir_rec_len(fake.name_len, NULL),
1323					  inline_size);
1324			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1325			de = &fake;
1326			pos = EXT4_INLINE_DOTDOT_SIZE;
1327		} else {
1328			de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1329			pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1330			if (ext4_check_dir_entry(inode, dir_file, de,
1331					 iloc.bh, dir_buf,
1332					 inline_size, pos)) {
1333				ret = count;
1334				goto out;
1335			}
1336		}
1337
1338		if (ext4_hash_in_dirent(dir)) {
1339			hinfo->hash = EXT4_DIRENT_HASH(de);
1340			hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1341		} else {
1342			err = ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1343			if (err) {
1344				ret = err;
1345				goto out;
1346			}
1347		}
1348		if ((hinfo->hash < start_hash) ||
1349		    ((hinfo->hash == start_hash) &&
1350		     (hinfo->minor_hash < start_minor_hash)))
1351			continue;
1352		if (de->inode == 0)
1353			continue;
1354		tmp_str.name = de->name;
1355		tmp_str.len = de->name_len;
1356		err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1357					      hinfo->minor_hash, de, &tmp_str);
1358		if (err) {
1359			ret = err;
1360			goto out;
1361		}
1362		count++;
1363	}
1364	ret = count;
1365out:
1366	kfree(dir_buf);
1367	brelse(iloc.bh);
1368	return ret;
1369}
1370
1371/*
1372 * So this function is called when the volume is mkfsed with
1373 * dir_index disabled. In order to keep f_pos persistent
1374 * after we convert from an inlined dir to a blocked based,
1375 * we just pretend that we are a normal dir and return the
1376 * offset as if '.' and '..' really take place.
1377 *
1378 */
1379int ext4_read_inline_dir(struct file *file,
1380			 struct dir_context *ctx,
1381			 int *has_inline_data)
1382{
1383	unsigned int offset, parent_ino;
1384	int i;
1385	struct ext4_dir_entry_2 *de;
1386	struct super_block *sb;
1387	struct inode *inode = file_inode(file);
1388	int ret, inline_size = 0;
1389	struct ext4_iloc iloc;
1390	void *dir_buf = NULL;
1391	int dotdot_offset, dotdot_size, extra_offset, extra_size;
1392	struct dir_private_info *info = file->private_data;
1393
1394	ret = ext4_get_inode_loc(inode, &iloc);
1395	if (ret)
1396		return ret;
1397
1398	down_read(&EXT4_I(inode)->xattr_sem);
1399	if (!ext4_has_inline_data(inode)) {
1400		up_read(&EXT4_I(inode)->xattr_sem);
1401		*has_inline_data = 0;
1402		goto out;
1403	}
1404
1405	inline_size = ext4_get_inline_size(inode);
1406	dir_buf = kmalloc(inline_size, GFP_NOFS);
1407	if (!dir_buf) {
1408		ret = -ENOMEM;
1409		up_read(&EXT4_I(inode)->xattr_sem);
1410		goto out;
1411	}
1412
1413	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1414	up_read(&EXT4_I(inode)->xattr_sem);
1415	if (ret < 0)
1416		goto out;
1417
1418	ret = 0;
1419	sb = inode->i_sb;
1420	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1421	offset = ctx->pos;
1422
1423	/*
1424	 * dotdot_offset and dotdot_size is the real offset and
1425	 * size for ".." and "." if the dir is block based while
1426	 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1427	 * So we will use extra_offset and extra_size to indicate them
1428	 * during the inline dir iteration.
1429	 */
1430	dotdot_offset = ext4_dir_rec_len(1, NULL);
1431	dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1432	extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1433	extra_size = extra_offset + inline_size;
1434
1435	/*
1436	 * If the cookie has changed since the last call to
1437	 * readdir(2), then we might be pointing to an invalid
1438	 * dirent right now.  Scan from the start of the inline
1439	 * dir to make sure.
1440	 */
1441	if (!inode_eq_iversion(inode, info->cookie)) {
1442		for (i = 0; i < extra_size && i < offset;) {
1443			/*
1444			 * "." is with offset 0 and
1445			 * ".." is dotdot_offset.
1446			 */
1447			if (!i) {
1448				i = dotdot_offset;
1449				continue;
1450			} else if (i == dotdot_offset) {
1451				i = dotdot_size;
1452				continue;
1453			}
1454			/* for other entry, the real offset in
1455			 * the buf has to be tuned accordingly.
1456			 */
1457			de = (struct ext4_dir_entry_2 *)
1458				(dir_buf + i - extra_offset);
1459			/* It's too expensive to do a full
1460			 * dirent test each time round this
1461			 * loop, but we do have to test at
1462			 * least that it is non-zero.  A
1463			 * failure will be detected in the
1464			 * dirent test below. */
1465			if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1466				< ext4_dir_rec_len(1, NULL))
1467				break;
1468			i += ext4_rec_len_from_disk(de->rec_len,
1469						    extra_size);
1470		}
1471		offset = i;
1472		ctx->pos = offset;
1473		info->cookie = inode_query_iversion(inode);
1474	}
1475
1476	while (ctx->pos < extra_size) {
1477		if (ctx->pos == 0) {
1478			if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1479				goto out;
1480			ctx->pos = dotdot_offset;
1481			continue;
1482		}
1483
1484		if (ctx->pos == dotdot_offset) {
1485			if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1486				goto out;
1487			ctx->pos = dotdot_size;
1488			continue;
1489		}
1490
1491		de = (struct ext4_dir_entry_2 *)
1492			(dir_buf + ctx->pos - extra_offset);
1493		if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1494					 extra_size, ctx->pos))
1495			goto out;
1496		if (le32_to_cpu(de->inode)) {
1497			if (!dir_emit(ctx, de->name, de->name_len,
1498				      le32_to_cpu(de->inode),
1499				      get_dtype(sb, de->file_type)))
1500				goto out;
1501		}
1502		ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1503	}
1504out:
1505	kfree(dir_buf);
1506	brelse(iloc.bh);
1507	return ret;
1508}
1509
1510void *ext4_read_inline_link(struct inode *inode)
1511{
1512	struct ext4_iloc iloc;
1513	int ret, inline_size;
1514	void *link;
1515
1516	ret = ext4_get_inode_loc(inode, &iloc);
1517	if (ret)
1518		return ERR_PTR(ret);
1519
1520	ret = -ENOMEM;
1521	inline_size = ext4_get_inline_size(inode);
1522	link = kmalloc(inline_size + 1, GFP_NOFS);
1523	if (!link)
1524		goto out;
1525
1526	ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1527	if (ret < 0) {
1528		kfree(link);
1529		goto out;
1530	}
1531	nd_terminate_link(link, inode->i_size, ret);
1532out:
1533	if (ret < 0)
1534		link = ERR_PTR(ret);
1535	brelse(iloc.bh);
1536	return link;
1537}
1538
1539struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1540					struct ext4_dir_entry_2 **parent_de,
1541					int *retval)
1542{
1543	struct ext4_iloc iloc;
1544
1545	*retval = ext4_get_inode_loc(inode, &iloc);
1546	if (*retval)
1547		return NULL;
1548
1549	*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1550
1551	return iloc.bh;
1552}
1553
1554/*
1555 * Try to create the inline data for the new dir.
1556 * If it succeeds, return 0, otherwise return the error.
1557 * In case of ENOSPC, the caller should create the normal disk layout dir.
1558 */
1559int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1560			       struct inode *inode)
1561{
1562	int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1563	struct ext4_iloc iloc;
1564	struct ext4_dir_entry_2 *de;
1565
1566	ret = ext4_get_inode_loc(inode, &iloc);
1567	if (ret)
1568		return ret;
1569
1570	ret = ext4_prepare_inline_data(handle, inode, inline_size);
1571	if (ret)
1572		goto out;
1573
1574	/*
1575	 * For inline dir, we only save the inode information for the ".."
1576	 * and create a fake dentry to cover the left space.
1577	 */
1578	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1579	de->inode = cpu_to_le32(parent->i_ino);
1580	de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1581	de->inode = 0;
1582	de->rec_len = ext4_rec_len_to_disk(
1583				inline_size - EXT4_INLINE_DOTDOT_SIZE,
1584				inline_size);
1585	set_nlink(inode, 2);
1586	inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1587out:
1588	brelse(iloc.bh);
1589	return ret;
1590}
1591
1592struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1593					struct ext4_filename *fname,
1594					struct ext4_dir_entry_2 **res_dir,
1595					int *has_inline_data)
1596{
1597	struct ext4_xattr_ibody_find is = {
1598		.s = { .not_found = -ENODATA, },
1599	};
1600	struct ext4_xattr_info i = {
1601		.name_index = EXT4_XATTR_INDEX_SYSTEM,
1602		.name = EXT4_XATTR_SYSTEM_DATA,
1603	};
1604	int ret;
1605	void *inline_start;
1606	int inline_size;
1607
1608	ret = ext4_get_inode_loc(dir, &is.iloc);
1609	if (ret)
1610		return ERR_PTR(ret);
1611
1612	down_read(&EXT4_I(dir)->xattr_sem);
1613
1614	ret = ext4_xattr_ibody_find(dir, &i, &is);
1615	if (ret)
1616		goto out;
1617
1618	if (!ext4_has_inline_data(dir)) {
1619		*has_inline_data = 0;
1620		goto out;
1621	}
1622
1623	inline_start = (void *)ext4_raw_inode(&is.iloc)->i_block +
1624						EXT4_INLINE_DOTDOT_SIZE;
1625	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1626	ret = ext4_search_dir(is.iloc.bh, inline_start, inline_size,
1627			      dir, fname, 0, res_dir);
1628	if (ret == 1)
1629		goto out_find;
1630	if (ret < 0)
1631		goto out;
1632
1633	if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1634		goto out;
1635
1636	inline_start = ext4_get_inline_xattr_pos(dir, &is.iloc);
1637	inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1638
1639	ret = ext4_search_dir(is.iloc.bh, inline_start, inline_size,
1640			      dir, fname, 0, res_dir);
1641	if (ret == 1)
1642		goto out_find;
1643
1644out:
1645	brelse(is.iloc.bh);
1646	if (ret < 0)
1647		is.iloc.bh = ERR_PTR(ret);
1648	else
1649		is.iloc.bh = NULL;
1650out_find:
1651	up_read(&EXT4_I(dir)->xattr_sem);
1652	return is.iloc.bh;
1653}
1654
1655int ext4_delete_inline_entry(handle_t *handle,
1656			     struct inode *dir,
1657			     struct ext4_dir_entry_2 *de_del,
1658			     struct buffer_head *bh,
1659			     int *has_inline_data)
1660{
1661	int err, inline_size, no_expand;
1662	struct ext4_iloc iloc;
1663	void *inline_start;
1664
1665	err = ext4_get_inode_loc(dir, &iloc);
1666	if (err)
1667		return err;
1668
1669	ext4_write_lock_xattr(dir, &no_expand);
1670	if (!ext4_has_inline_data(dir)) {
1671		*has_inline_data = 0;
1672		goto out;
1673	}
1674
1675	if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1676		EXT4_MIN_INLINE_DATA_SIZE) {
1677		inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1678					EXT4_INLINE_DOTDOT_SIZE;
1679		inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1680				EXT4_INLINE_DOTDOT_SIZE;
1681	} else {
1682		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1683		inline_size = ext4_get_inline_size(dir) -
1684				EXT4_MIN_INLINE_DATA_SIZE;
1685	}
1686
1687	BUFFER_TRACE(bh, "get_write_access");
1688	err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1689					    EXT4_JTR_NONE);
1690	if (err)
1691		goto out;
1692
1693	err = ext4_generic_delete_entry(dir, de_del, bh,
1694					inline_start, inline_size, 0);
1695	if (err)
1696		goto out;
1697
1698	ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1699out:
1700	ext4_write_unlock_xattr(dir, &no_expand);
1701	if (likely(err == 0))
1702		err = ext4_mark_inode_dirty(handle, dir);
1703	brelse(iloc.bh);
1704	if (err != -ENOENT)
1705		ext4_std_error(dir->i_sb, err);
1706	return err;
1707}
1708
1709/*
1710 * Get the inline dentry at offset.
1711 */
1712static inline struct ext4_dir_entry_2 *
1713ext4_get_inline_entry(struct inode *inode,
1714		      struct ext4_iloc *iloc,
1715		      unsigned int offset,
1716		      void **inline_start,
1717		      int *inline_size)
1718{
1719	void *inline_pos;
1720
1721	BUG_ON(offset > ext4_get_inline_size(inode));
1722
1723	if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1724		inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1725		*inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1726	} else {
1727		inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1728		offset -= EXT4_MIN_INLINE_DATA_SIZE;
1729		*inline_size = ext4_get_inline_size(inode) -
1730				EXT4_MIN_INLINE_DATA_SIZE;
1731	}
1732
1733	if (inline_start)
1734		*inline_start = inline_pos;
1735	return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1736}
1737
1738bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1739{
1740	int err, inline_size;
1741	struct ext4_iloc iloc;
1742	size_t inline_len;
1743	void *inline_pos;
1744	unsigned int offset;
1745	struct ext4_dir_entry_2 *de;
1746	bool ret = false;
1747
1748	err = ext4_get_inode_loc(dir, &iloc);
1749	if (err) {
1750		EXT4_ERROR_INODE_ERR(dir, -err,
1751				     "error %d getting inode %lu block",
1752				     err, dir->i_ino);
1753		return false;
1754	}
1755
1756	down_read(&EXT4_I(dir)->xattr_sem);
1757	if (!ext4_has_inline_data(dir)) {
1758		*has_inline_data = 0;
1759		ret = true;
1760		goto out;
1761	}
1762
1763	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1764	if (!le32_to_cpu(de->inode)) {
1765		ext4_warning(dir->i_sb,
1766			     "bad inline directory (dir #%lu) - no `..'",
1767			     dir->i_ino);
1768		goto out;
1769	}
1770
1771	inline_len = ext4_get_inline_size(dir);
1772	offset = EXT4_INLINE_DOTDOT_SIZE;
1773	while (offset < inline_len) {
1774		de = ext4_get_inline_entry(dir, &iloc, offset,
1775					   &inline_pos, &inline_size);
1776		if (ext4_check_dir_entry(dir, NULL, de,
1777					 iloc.bh, inline_pos,
1778					 inline_size, offset)) {
1779			ext4_warning(dir->i_sb,
1780				     "bad inline directory (dir #%lu) - "
1781				     "inode %u, rec_len %u, name_len %d"
1782				     "inline size %d",
1783				     dir->i_ino, le32_to_cpu(de->inode),
1784				     le16_to_cpu(de->rec_len), de->name_len,
1785				     inline_size);
1786			goto out;
1787		}
1788		if (le32_to_cpu(de->inode)) {
1789			goto out;
1790		}
1791		offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1792	}
1793
1794	ret = true;
1795out:
1796	up_read(&EXT4_I(dir)->xattr_sem);
1797	brelse(iloc.bh);
1798	return ret;
1799}
1800
1801int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1802{
1803	int ret, no_expand;
1804
1805	ext4_write_lock_xattr(inode, &no_expand);
1806	ret = ext4_destroy_inline_data_nolock(handle, inode);
1807	ext4_write_unlock_xattr(inode, &no_expand);
1808
1809	return ret;
1810}
1811
1812int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1813{
1814	__u64 addr;
1815	int error = -EAGAIN;
1816	struct ext4_iloc iloc;
1817
1818	down_read(&EXT4_I(inode)->xattr_sem);
1819	if (!ext4_has_inline_data(inode))
1820		goto out;
1821
1822	error = ext4_get_inode_loc(inode, &iloc);
1823	if (error)
1824		goto out;
1825
1826	addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1827	addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1828	addr += offsetof(struct ext4_inode, i_block);
1829
1830	brelse(iloc.bh);
1831
1832	iomap->addr = addr;
1833	iomap->offset = 0;
1834	iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1835			      i_size_read(inode));
1836	iomap->type = IOMAP_INLINE;
1837	iomap->flags = 0;
1838
1839out:
1840	up_read(&EXT4_I(inode)->xattr_sem);
1841	return error;
1842}
1843
1844int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1845{
1846	handle_t *handle;
1847	int inline_size, value_len, needed_blocks, no_expand, err = 0;
1848	size_t i_size;
1849	void *value = NULL;
1850	struct ext4_xattr_ibody_find is = {
1851		.s = { .not_found = -ENODATA, },
1852	};
1853	struct ext4_xattr_info i = {
1854		.name_index = EXT4_XATTR_INDEX_SYSTEM,
1855		.name = EXT4_XATTR_SYSTEM_DATA,
1856	};
1857
1858
1859	needed_blocks = ext4_chunk_trans_extent(inode, 1);
1860	handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1861	if (IS_ERR(handle))
1862		return PTR_ERR(handle);
1863
1864	ext4_write_lock_xattr(inode, &no_expand);
1865	if (!ext4_has_inline_data(inode)) {
1866		ext4_write_unlock_xattr(inode, &no_expand);
1867		*has_inline = 0;
1868		ext4_journal_stop(handle);
1869		return 0;
1870	}
1871
1872	if ((err = ext4_orphan_add(handle, inode)) != 0)
1873		goto out;
1874
1875	if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1876		goto out;
1877
1878	down_write(&EXT4_I(inode)->i_data_sem);
1879	i_size = inode->i_size;
1880	inline_size = ext4_get_inline_size(inode);
1881	EXT4_I(inode)->i_disksize = i_size;
1882
1883	if (i_size < inline_size) {
1884		/*
1885		 * if there's inline data to truncate and this file was
1886		 * converted to extents after that inline data was written,
1887		 * the extent status cache must be cleared to avoid leaving
1888		 * behind stale delayed allocated extent entries
1889		 */
1890		if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
1891			ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1892
1893		/* Clear the content in the xattr space. */
1894		if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1895			if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1896				goto out_error;
1897
1898			if (is.s.not_found) {
1899				EXT4_ERROR_INODE(inode,
1900						 "missing inline data xattr");
1901				err = -EFSCORRUPTED;
1902				goto out_error;
1903			}
1904
1905			value_len = le32_to_cpu(is.s.here->e_value_size);
1906			value = kmalloc(value_len, GFP_NOFS);
1907			if (!value) {
1908				err = -ENOMEM;
1909				goto out_error;
1910			}
1911
1912			err = ext4_xattr_ibody_get(inode, i.name_index,
1913						   i.name, value, value_len);
1914			if (err <= 0)
1915				goto out_error;
1916
1917			i.value = value;
1918			i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1919					i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1920			err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1921			if (err)
1922				goto out_error;
1923		}
1924
1925		/* Clear the content within i_blocks. */
1926		if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1927			void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1928			memset(p + i_size, 0,
1929			       EXT4_MIN_INLINE_DATA_SIZE - i_size);
1930		}
1931
1932		EXT4_I(inode)->i_inline_size = i_size <
1933					EXT4_MIN_INLINE_DATA_SIZE ?
1934					EXT4_MIN_INLINE_DATA_SIZE : i_size;
1935	}
1936
1937out_error:
1938	up_write(&EXT4_I(inode)->i_data_sem);
1939out:
1940	brelse(is.iloc.bh);
1941	ext4_write_unlock_xattr(inode, &no_expand);
1942	kfree(value);
1943	if (inode->i_nlink)
1944		ext4_orphan_del(handle, inode);
1945
1946	if (err == 0) {
1947		inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1948		err = ext4_mark_inode_dirty(handle, inode);
1949		if (IS_SYNC(inode))
1950			ext4_handle_sync(handle);
1951	}
1952	ext4_journal_stop(handle);
1953	return err;
1954}
1955
1956int ext4_convert_inline_data(struct inode *inode)
1957{
1958	int error, needed_blocks, no_expand;
1959	handle_t *handle;
1960	struct ext4_iloc iloc;
1961
1962	if (!ext4_has_inline_data(inode)) {
1963		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1964		return 0;
1965	} else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1966		/*
1967		 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
1968		 * cleared. This means we are in the middle of moving of
1969		 * inline data to delay allocated block. Just force writeout
1970		 * here to finish conversion.
1971		 */
1972		error = filemap_flush(inode->i_mapping);
1973		if (error)
1974			return error;
1975		if (!ext4_has_inline_data(inode))
1976			return 0;
1977	}
1978
1979	needed_blocks = ext4_chunk_trans_extent(inode, 1);
1980
1981	iloc.bh = NULL;
1982	error = ext4_get_inode_loc(inode, &iloc);
1983	if (error)
1984		return error;
1985
1986	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1987	if (IS_ERR(handle)) {
1988		error = PTR_ERR(handle);
1989		goto out_free;
1990	}
1991
1992	ext4_write_lock_xattr(inode, &no_expand);
1993	if (ext4_has_inline_data(inode))
1994		error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1995	ext4_write_unlock_xattr(inode, &no_expand);
1996	ext4_journal_stop(handle);
1997out_free:
1998	brelse(iloc.bh);
1999	return error;
2000}