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
  23static int ext4_get_inline_size(struct inode *inode)
  24{
  25	if (EXT4_I(inode)->i_inline_off)
  26		return EXT4_I(inode)->i_inline_size;
  27
  28	return 0;
  29}
  30
  31static int get_max_inline_xattr_value_size(struct inode *inode,
  32					   struct ext4_iloc *iloc)
  33{
  34	struct ext4_xattr_ibody_header *header;
  35	struct ext4_xattr_entry *entry;
  36	struct ext4_inode *raw_inode;
  37	int free, min_offs;
  38
  39	if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  40		return 0;
  41
  42	min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  43			EXT4_GOOD_OLD_INODE_SIZE -
  44			EXT4_I(inode)->i_extra_isize -
  45			sizeof(struct ext4_xattr_ibody_header);
  46
  47	/*
  48	 * We need to subtract another sizeof(__u32) since an in-inode xattr
  49	 * needs an empty 4 bytes to indicate the gap between the xattr entry
  50	 * and the name/value pair.
  51	 */
  52	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  53		return EXT4_XATTR_SIZE(min_offs -
  54			EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  55			EXT4_XATTR_ROUND - sizeof(__u32));
  56
  57	raw_inode = ext4_raw_inode(iloc);
  58	header = IHDR(inode, raw_inode);
  59	entry = IFIRST(header);
  60
  61	/* Compute min_offs. */
  62	for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  63		if (!entry->e_value_inum && entry->e_value_size) {
  64			size_t offs = le16_to_cpu(entry->e_value_offs);
  65			if (offs < min_offs)
  66				min_offs = offs;
  67		}
  68	}
  69	free = min_offs -
  70		((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  71
  72	if (EXT4_I(inode)->i_inline_off) {
  73		entry = (struct ext4_xattr_entry *)
  74			((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  75
  76		free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  77		goto out;
  78	}
  79
  80	free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  81
  82	if (free > EXT4_XATTR_ROUND)
  83		free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  84	else
  85		free = 0;
  86
  87out:
  88	return free;
  89}
  90
  91/*
  92 * Get the maximum size we now can store in an inode.
  93 * If we can't find the space for a xattr entry, don't use the space
  94 * of the extents since we have no space to indicate the inline data.
  95 */
  96int ext4_get_max_inline_size(struct inode *inode)
  97{
  98	int error, max_inline_size;
  99	struct ext4_iloc iloc;
 100
 101	if (EXT4_I(inode)->i_extra_isize == 0)
 102		return 0;
 103
 104	error = ext4_get_inode_loc(inode, &iloc);
 105	if (error) {
 106		ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 107				     "can't get inode location %lu",
 108				     inode->i_ino);
 109		return 0;
 110	}
 111
 112	down_read(&EXT4_I(inode)->xattr_sem);
 113	max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 114	up_read(&EXT4_I(inode)->xattr_sem);
 115
 116	brelse(iloc.bh);
 117
 118	if (!max_inline_size)
 119		return 0;
 120
 121	return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 122}
 123
 124/*
 125 * this function does not take xattr_sem, which is OK because it is
 126 * currently only used in a code path coming form ext4_iget, before
 127 * the new inode has been unlocked
 128 */
 129int ext4_find_inline_data_nolock(struct inode *inode)
 130{
 131	struct ext4_xattr_ibody_find is = {
 132		.s = { .not_found = -ENODATA, },
 133	};
 134	struct ext4_xattr_info i = {
 135		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 136		.name = EXT4_XATTR_SYSTEM_DATA,
 137	};
 138	int error;
 139
 140	if (EXT4_I(inode)->i_extra_isize == 0)
 141		return 0;
 142
 143	error = ext4_get_inode_loc(inode, &is.iloc);
 144	if (error)
 145		return error;
 146
 147	error = ext4_xattr_ibody_find(inode, &i, &is);
 148	if (error)
 149		goto out;
 150
 151	if (!is.s.not_found) {
 152		if (is.s.here->e_value_inum) {
 153			EXT4_ERROR_INODE(inode, "inline data xattr refers "
 154					 "to an external xattr inode");
 155			error = -EFSCORRUPTED;
 156			goto out;
 157		}
 158		EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 159					(void *)ext4_raw_inode(&is.iloc));
 160		EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 161				le32_to_cpu(is.s.here->e_value_size);
 162		ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 163	}
 164out:
 165	brelse(is.iloc.bh);
 166	return error;
 167}
 168
 169static int ext4_read_inline_data(struct inode *inode, void *buffer,
 170				 unsigned int len,
 171				 struct ext4_iloc *iloc)
 172{
 173	struct ext4_xattr_entry *entry;
 174	struct ext4_xattr_ibody_header *header;
 175	int cp_len = 0;
 176	struct ext4_inode *raw_inode;
 177
 178	if (!len)
 179		return 0;
 180
 181	BUG_ON(len > EXT4_I(inode)->i_inline_size);
 182
 183	cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
 
 184
 185	raw_inode = ext4_raw_inode(iloc);
 186	memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 187
 188	len -= cp_len;
 189	buffer += cp_len;
 190
 191	if (!len)
 192		goto out;
 193
 194	header = IHDR(inode, raw_inode);
 195	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 196					    EXT4_I(inode)->i_inline_off);
 197	len = min_t(unsigned int, len,
 198		    (unsigned int)le32_to_cpu(entry->e_value_size));
 199
 200	memcpy(buffer,
 201	       (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 202	cp_len += len;
 203
 204out:
 205	return cp_len;
 206}
 207
 208/*
 209 * write the buffer to the inline inode.
 210 * If 'create' is set, we don't need to do the extra copy in the xattr
 211 * value since it is already handled by ext4_xattr_ibody_set.
 212 * That saves us one memcpy.
 213 */
 214static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 215				   void *buffer, loff_t pos, unsigned int len)
 216{
 217	struct ext4_xattr_entry *entry;
 218	struct ext4_xattr_ibody_header *header;
 219	struct ext4_inode *raw_inode;
 220	int cp_len = 0;
 221
 222	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 223		return;
 224
 225	BUG_ON(!EXT4_I(inode)->i_inline_off);
 226	BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 227
 228	raw_inode = ext4_raw_inode(iloc);
 229	buffer += pos;
 230
 231	if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 232		cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 233			 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 234		memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 235
 236		len -= cp_len;
 237		buffer += cp_len;
 238		pos += cp_len;
 239	}
 240
 241	if (!len)
 242		return;
 243
 244	pos -= EXT4_MIN_INLINE_DATA_SIZE;
 245	header = IHDR(inode, raw_inode);
 246	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 247					    EXT4_I(inode)->i_inline_off);
 248
 249	memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 250	       buffer, len);
 251}
 252
 253static int ext4_create_inline_data(handle_t *handle,
 254				   struct inode *inode, unsigned len)
 255{
 256	int error;
 257	void *value = NULL;
 258	struct ext4_xattr_ibody_find is = {
 259		.s = { .not_found = -ENODATA, },
 260	};
 261	struct ext4_xattr_info i = {
 262		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 263		.name = EXT4_XATTR_SYSTEM_DATA,
 264	};
 265
 266	error = ext4_get_inode_loc(inode, &is.iloc);
 267	if (error)
 268		return error;
 269
 270	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 271	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 272					      EXT4_JTR_NONE);
 273	if (error)
 274		goto out;
 275
 276	if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 277		value = EXT4_ZERO_XATTR_VALUE;
 278		len -= EXT4_MIN_INLINE_DATA_SIZE;
 279	} else {
 280		value = "";
 281		len = 0;
 282	}
 283
 284	/* Insert the xttr entry. */
 285	i.value = value;
 286	i.value_len = len;
 287
 288	error = ext4_xattr_ibody_find(inode, &i, &is);
 289	if (error)
 290		goto out;
 291
 292	BUG_ON(!is.s.not_found);
 293
 294	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 295	if (error) {
 296		if (error == -ENOSPC)
 297			ext4_clear_inode_state(inode,
 298					       EXT4_STATE_MAY_INLINE_DATA);
 299		goto out;
 300	}
 301
 302	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 303		0, EXT4_MIN_INLINE_DATA_SIZE);
 304
 305	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 306				      (void *)ext4_raw_inode(&is.iloc));
 307	EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 308	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 309	ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 310	get_bh(is.iloc.bh);
 311	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 312
 313out:
 314	brelse(is.iloc.bh);
 315	return error;
 316}
 317
 318static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 319				   unsigned int len)
 320{
 321	int error;
 322	void *value = NULL;
 323	struct ext4_xattr_ibody_find is = {
 324		.s = { .not_found = -ENODATA, },
 325	};
 326	struct ext4_xattr_info i = {
 327		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 328		.name = EXT4_XATTR_SYSTEM_DATA,
 329	};
 330
 331	/* If the old space is ok, write the data directly. */
 332	if (len <= EXT4_I(inode)->i_inline_size)
 333		return 0;
 334
 335	error = ext4_get_inode_loc(inode, &is.iloc);
 336	if (error)
 337		return error;
 338
 339	error = ext4_xattr_ibody_find(inode, &i, &is);
 340	if (error)
 341		goto out;
 342
 343	BUG_ON(is.s.not_found);
 344
 345	len -= EXT4_MIN_INLINE_DATA_SIZE;
 346	value = kzalloc(len, GFP_NOFS);
 347	if (!value) {
 348		error = -ENOMEM;
 349		goto out;
 350	}
 351
 352	error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 353				     value, len);
 354	if (error == -ENODATA)
 355		goto out;
 356
 357	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 358	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 359					      EXT4_JTR_NONE);
 360	if (error)
 361		goto out;
 362
 363	/* Update the xattr entry. */
 364	i.value = value;
 365	i.value_len = len;
 366
 367	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 368	if (error)
 369		goto out;
 370
 371	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 372				      (void *)ext4_raw_inode(&is.iloc));
 373	EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 374				le32_to_cpu(is.s.here->e_value_size);
 375	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 376	get_bh(is.iloc.bh);
 377	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 378
 379out:
 380	kfree(value);
 381	brelse(is.iloc.bh);
 382	return error;
 383}
 384
 385static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 386				    unsigned int len)
 387{
 388	int ret, size, no_expand;
 389	struct ext4_inode_info *ei = EXT4_I(inode);
 390
 391	if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 392		return -ENOSPC;
 393
 394	size = ext4_get_max_inline_size(inode);
 395	if (size < len)
 396		return -ENOSPC;
 397
 398	ext4_write_lock_xattr(inode, &no_expand);
 399
 400	if (ei->i_inline_off)
 401		ret = ext4_update_inline_data(handle, inode, len);
 402	else
 403		ret = ext4_create_inline_data(handle, inode, len);
 404
 405	ext4_write_unlock_xattr(inode, &no_expand);
 406	return ret;
 407}
 408
 409static int ext4_destroy_inline_data_nolock(handle_t *handle,
 410					   struct inode *inode)
 411{
 412	struct ext4_inode_info *ei = EXT4_I(inode);
 413	struct ext4_xattr_ibody_find is = {
 414		.s = { .not_found = 0, },
 415	};
 416	struct ext4_xattr_info i = {
 417		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 418		.name = EXT4_XATTR_SYSTEM_DATA,
 419		.value = NULL,
 420		.value_len = 0,
 421	};
 422	int error;
 423
 424	if (!ei->i_inline_off)
 425		return 0;
 426
 427	error = ext4_get_inode_loc(inode, &is.iloc);
 428	if (error)
 429		return error;
 430
 431	error = ext4_xattr_ibody_find(inode, &i, &is);
 432	if (error)
 433		goto out;
 434
 435	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 436	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 437					      EXT4_JTR_NONE);
 438	if (error)
 439		goto out;
 440
 441	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 442	if (error)
 443		goto out;
 444
 445	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 446		0, EXT4_MIN_INLINE_DATA_SIZE);
 447	memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 448
 449	if (ext4_has_feature_extents(inode->i_sb)) {
 450		if (S_ISDIR(inode->i_mode) ||
 451		    S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 452			ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 453			ext4_ext_tree_init(handle, inode);
 454		}
 455	}
 456	ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 457
 458	get_bh(is.iloc.bh);
 459	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 460
 461	EXT4_I(inode)->i_inline_off = 0;
 462	EXT4_I(inode)->i_inline_size = 0;
 463	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 464out:
 465	brelse(is.iloc.bh);
 466	if (error == -ENODATA)
 467		error = 0;
 468	return error;
 469}
 470
 471static int ext4_read_inline_page(struct inode *inode, struct page *page)
 472{
 473	void *kaddr;
 474	int ret = 0;
 475	size_t len;
 476	struct ext4_iloc iloc;
 477
 478	BUG_ON(!PageLocked(page));
 479	BUG_ON(!ext4_has_inline_data(inode));
 480	BUG_ON(page->index);
 481
 482	if (!EXT4_I(inode)->i_inline_off) {
 483		ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 484			     inode->i_ino);
 485		goto out;
 486	}
 487
 488	ret = ext4_get_inode_loc(inode, &iloc);
 489	if (ret)
 490		goto out;
 491
 492	len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 493	kaddr = kmap_atomic(page);
 494	ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 495	flush_dcache_page(page);
 496	kunmap_atomic(kaddr);
 497	zero_user_segment(page, len, PAGE_SIZE);
 498	SetPageUptodate(page);
 499	brelse(iloc.bh);
 500
 501out:
 502	return ret;
 503}
 504
 505int ext4_readpage_inline(struct inode *inode, struct page *page)
 506{
 507	int ret = 0;
 508
 509	down_read(&EXT4_I(inode)->xattr_sem);
 510	if (!ext4_has_inline_data(inode)) {
 511		up_read(&EXT4_I(inode)->xattr_sem);
 512		return -EAGAIN;
 513	}
 514
 515	/*
 516	 * Current inline data can only exist in the 1st page,
 517	 * So for all the other pages, just set them uptodate.
 518	 */
 519	if (!page->index)
 520		ret = ext4_read_inline_page(inode, page);
 521	else if (!PageUptodate(page)) {
 522		zero_user_segment(page, 0, PAGE_SIZE);
 523		SetPageUptodate(page);
 524	}
 525
 526	up_read(&EXT4_I(inode)->xattr_sem);
 527
 528	unlock_page(page);
 529	return ret >= 0 ? 0 : ret;
 530}
 531
 532static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 533					      struct inode *inode)
 
 534{
 535	int ret, needed_blocks, no_expand;
 536	handle_t *handle = NULL;
 537	int retries = 0, sem_held = 0;
 538	struct page *page = NULL;
 539	unsigned int flags;
 540	unsigned from, to;
 541	struct ext4_iloc iloc;
 542
 543	if (!ext4_has_inline_data(inode)) {
 544		/*
 545		 * clear the flag so that no new write
 546		 * will trap here again.
 547		 */
 548		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 549		return 0;
 550	}
 551
 552	needed_blocks = ext4_writepage_trans_blocks(inode);
 553
 554	ret = ext4_get_inode_loc(inode, &iloc);
 555	if (ret)
 556		return ret;
 557
 558retry:
 559	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 560	if (IS_ERR(handle)) {
 561		ret = PTR_ERR(handle);
 562		handle = NULL;
 563		goto out;
 564	}
 565
 566	/* We cannot recurse into the filesystem as the transaction is already
 567	 * started */
 568	flags = memalloc_nofs_save();
 569	page = grab_cache_page_write_begin(mapping, 0);
 570	memalloc_nofs_restore(flags);
 571	if (!page) {
 572		ret = -ENOMEM;
 573		goto out;
 574	}
 575
 576	ext4_write_lock_xattr(inode, &no_expand);
 577	sem_held = 1;
 578	/* If some one has already done this for us, just exit. */
 579	if (!ext4_has_inline_data(inode)) {
 580		ret = 0;
 581		goto out;
 582	}
 583
 584	from = 0;
 585	to = ext4_get_inline_size(inode);
 586	if (!PageUptodate(page)) {
 587		ret = ext4_read_inline_page(inode, page);
 588		if (ret < 0)
 589			goto out;
 590	}
 591
 592	ret = ext4_destroy_inline_data_nolock(handle, inode);
 593	if (ret)
 594		goto out;
 595
 596	if (ext4_should_dioread_nolock(inode)) {
 597		ret = __block_write_begin(page, from, to,
 598					  ext4_get_block_unwritten);
 599	} else
 600		ret = __block_write_begin(page, from, to, ext4_get_block);
 601
 602	if (!ret && ext4_should_journal_data(inode)) {
 603		ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
 604					     from, to, NULL,
 605					     do_journal_get_write_access);
 606	}
 607
 608	if (ret) {
 609		unlock_page(page);
 610		put_page(page);
 611		page = NULL;
 612		ext4_orphan_add(handle, inode);
 613		ext4_write_unlock_xattr(inode, &no_expand);
 614		sem_held = 0;
 615		ext4_journal_stop(handle);
 616		handle = NULL;
 617		ext4_truncate_failed_write(inode);
 618		/*
 619		 * If truncate failed early the inode might
 620		 * still be on the orphan list; we need to
 621		 * make sure the inode is removed from the
 622		 * orphan list in that case.
 623		 */
 624		if (inode->i_nlink)
 625			ext4_orphan_del(NULL, inode);
 626	}
 627
 628	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 629		goto retry;
 630
 631	if (page)
 632		block_commit_write(page, from, to);
 633out:
 634	if (page) {
 635		unlock_page(page);
 636		put_page(page);
 637	}
 638	if (sem_held)
 639		ext4_write_unlock_xattr(inode, &no_expand);
 640	if (handle)
 641		ext4_journal_stop(handle);
 642	brelse(iloc.bh);
 643	return ret;
 644}
 645
 646/*
 647 * Try to write data in the inode.
 648 * If the inode has inline data, check whether the new write can be
 649 * in the inode also. If not, create the page the handle, move the data
 650 * to the page make it update and let the later codes create extent for it.
 651 */
 652int ext4_try_to_write_inline_data(struct address_space *mapping,
 653				  struct inode *inode,
 654				  loff_t pos, unsigned len,
 
 655				  struct page **pagep)
 656{
 657	int ret;
 658	handle_t *handle;
 659	unsigned int flags;
 660	struct page *page;
 661	struct ext4_iloc iloc;
 662
 663	if (pos + len > ext4_get_max_inline_size(inode))
 664		goto convert;
 665
 666	ret = ext4_get_inode_loc(inode, &iloc);
 667	if (ret)
 668		return ret;
 669
 670	/*
 671	 * The possible write could happen in the inode,
 672	 * so try to reserve the space in inode first.
 673	 */
 674	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 675	if (IS_ERR(handle)) {
 676		ret = PTR_ERR(handle);
 677		handle = NULL;
 678		goto out;
 679	}
 680
 681	ret = ext4_prepare_inline_data(handle, inode, pos + len);
 682	if (ret && ret != -ENOSPC)
 683		goto out;
 684
 685	/* We don't have space in inline inode, so convert it to extent. */
 686	if (ret == -ENOSPC) {
 687		ext4_journal_stop(handle);
 688		brelse(iloc.bh);
 689		goto convert;
 690	}
 691
 692	ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 693					    EXT4_JTR_NONE);
 694	if (ret)
 695		goto out;
 696
 697	flags = memalloc_nofs_save();
 698	page = grab_cache_page_write_begin(mapping, 0);
 699	memalloc_nofs_restore(flags);
 700	if (!page) {
 701		ret = -ENOMEM;
 702		goto out;
 703	}
 704
 705	*pagep = page;
 706	down_read(&EXT4_I(inode)->xattr_sem);
 707	if (!ext4_has_inline_data(inode)) {
 708		ret = 0;
 709		unlock_page(page);
 710		put_page(page);
 711		goto out_up_read;
 712	}
 713
 714	if (!PageUptodate(page)) {
 715		ret = ext4_read_inline_page(inode, page);
 716		if (ret < 0) {
 717			unlock_page(page);
 718			put_page(page);
 719			goto out_up_read;
 720		}
 721	}
 722
 723	ret = 1;
 724	handle = NULL;
 725out_up_read:
 726	up_read(&EXT4_I(inode)->xattr_sem);
 727out:
 728	if (handle && (ret != 1))
 729		ext4_journal_stop(handle);
 730	brelse(iloc.bh);
 731	return ret;
 732convert:
 733	return ext4_convert_inline_data_to_extent(mapping, inode);
 
 734}
 735
 736int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 737			       unsigned copied, struct page *page)
 738{
 739	handle_t *handle = ext4_journal_current_handle();
 740	int no_expand;
 741	void *kaddr;
 742	struct ext4_iloc iloc;
 743	int ret = 0, ret2;
 744
 745	if (unlikely(copied < len) && !PageUptodate(page))
 746		copied = 0;
 747
 748	if (likely(copied)) {
 749		ret = ext4_get_inode_loc(inode, &iloc);
 750		if (ret) {
 751			unlock_page(page);
 752			put_page(page);
 753			ext4_std_error(inode->i_sb, ret);
 754			goto out;
 755		}
 756		ext4_write_lock_xattr(inode, &no_expand);
 757		BUG_ON(!ext4_has_inline_data(inode));
 758
 759		/*
 760		 * ei->i_inline_off may have changed since
 761		 * ext4_write_begin() called
 762		 * ext4_try_to_write_inline_data()
 763		 */
 764		(void) ext4_find_inline_data_nolock(inode);
 765
 766		kaddr = kmap_atomic(page);
 767		ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 768		kunmap_atomic(kaddr);
 769		SetPageUptodate(page);
 770		/* clear page dirty so that writepages wouldn't work for us. */
 771		ClearPageDirty(page);
 772
 773		ext4_write_unlock_xattr(inode, &no_expand);
 774		brelse(iloc.bh);
 775
 776		/*
 777		 * It's important to update i_size while still holding page
 778		 * lock: page writeout could otherwise come in and zero
 779		 * beyond i_size.
 780		 */
 781		ext4_update_inode_size(inode, pos + copied);
 782	}
 783	unlock_page(page);
 784	put_page(page);
 785
 786	/*
 787	 * Don't mark the inode dirty under page lock. First, it unnecessarily
 788	 * makes the holding time of page lock longer. Second, it forces lock
 789	 * ordering of page lock and transaction start for journaling
 790	 * filesystems.
 791	 */
 792	if (likely(copied))
 793		mark_inode_dirty(inode);
 794out:
 795	/*
 796	 * If we didn't copy as much data as expected, we need to trim back
 797	 * size of xattr containing inline data.
 798	 */
 799	if (pos + len > inode->i_size && ext4_can_truncate(inode))
 800		ext4_orphan_add(handle, inode);
 801
 802	ret2 = ext4_journal_stop(handle);
 803	if (!ret)
 804		ret = ret2;
 805	if (pos + len > inode->i_size) {
 806		ext4_truncate_failed_write(inode);
 807		/*
 808		 * If truncate failed early the inode might still be
 809		 * on the orphan list; we need to make sure the inode
 810		 * is removed from the orphan list in that case.
 811		 */
 812		if (inode->i_nlink)
 813			ext4_orphan_del(NULL, inode);
 814	}
 815	return ret ? ret : copied;
 816}
 817
 818struct buffer_head *
 819ext4_journalled_write_inline_data(struct inode *inode,
 820				  unsigned len,
 821				  struct page *page)
 822{
 823	int ret, no_expand;
 824	void *kaddr;
 825	struct ext4_iloc iloc;
 826
 827	ret = ext4_get_inode_loc(inode, &iloc);
 828	if (ret) {
 829		ext4_std_error(inode->i_sb, ret);
 830		return NULL;
 831	}
 832
 833	ext4_write_lock_xattr(inode, &no_expand);
 834	kaddr = kmap_atomic(page);
 835	ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 836	kunmap_atomic(kaddr);
 837	ext4_write_unlock_xattr(inode, &no_expand);
 838
 839	return iloc.bh;
 840}
 841
 842/*
 843 * Try to make the page cache and handle ready for the inline data case.
 844 * We can call this function in 2 cases:
 845 * 1. The inode is created and the first write exceeds inline size. We can
 846 *    clear the inode state safely.
 847 * 2. The inode has inline data, then we need to read the data, make it
 848 *    update and dirty so that ext4_da_writepages can handle it. We don't
 849 *    need to start the journal since the file's metadata isn't changed now.
 850 */
 851static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 852						 struct inode *inode,
 
 853						 void **fsdata)
 854{
 855	int ret = 0, inline_size;
 856	struct page *page;
 857
 858	page = grab_cache_page_write_begin(mapping, 0);
 859	if (!page)
 860		return -ENOMEM;
 861
 862	down_read(&EXT4_I(inode)->xattr_sem);
 863	if (!ext4_has_inline_data(inode)) {
 864		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 865		goto out;
 866	}
 867
 868	inline_size = ext4_get_inline_size(inode);
 869
 870	if (!PageUptodate(page)) {
 871		ret = ext4_read_inline_page(inode, page);
 872		if (ret < 0)
 873			goto out;
 874	}
 875
 876	ret = __block_write_begin(page, 0, inline_size,
 877				  ext4_da_get_block_prep);
 878	if (ret) {
 879		up_read(&EXT4_I(inode)->xattr_sem);
 880		unlock_page(page);
 881		put_page(page);
 882		ext4_truncate_failed_write(inode);
 883		return ret;
 884	}
 885
 886	SetPageDirty(page);
 887	SetPageUptodate(page);
 888	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 889	*fsdata = (void *)CONVERT_INLINE_DATA;
 890
 891out:
 892	up_read(&EXT4_I(inode)->xattr_sem);
 893	if (page) {
 894		unlock_page(page);
 895		put_page(page);
 896	}
 897	return ret;
 898}
 899
 900/*
 901 * Prepare the write for the inline data.
 902 * If the data can be written into the inode, we just read
 903 * the page and make it uptodate, and start the journal.
 904 * Otherwise read the page, makes it dirty so that it can be
 905 * handle in writepages(the i_disksize update is left to the
 906 * normal ext4_da_write_end).
 907 */
 908int ext4_da_write_inline_data_begin(struct address_space *mapping,
 909				    struct inode *inode,
 910				    loff_t pos, unsigned len,
 
 911				    struct page **pagep,
 912				    void **fsdata)
 913{
 914	int ret;
 915	handle_t *handle;
 916	struct page *page;
 917	struct ext4_iloc iloc;
 918	int retries = 0;
 919	unsigned int flags;
 920
 921	ret = ext4_get_inode_loc(inode, &iloc);
 922	if (ret)
 923		return ret;
 924
 925retry_journal:
 926	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 927	if (IS_ERR(handle)) {
 928		ret = PTR_ERR(handle);
 929		goto out;
 930	}
 931
 932	ret = ext4_prepare_inline_data(handle, inode, pos + len);
 933	if (ret && ret != -ENOSPC)
 934		goto out_journal;
 
 
 
 
 
 
 
 
 
 
 
 935
 936	if (ret == -ENOSPC) {
 937		ext4_journal_stop(handle);
 938		ret = ext4_da_convert_inline_data_to_extent(mapping,
 939							    inode,
 
 940							    fsdata);
 941		if (ret == -ENOSPC &&
 942		    ext4_should_retry_alloc(inode->i_sb, &retries))
 943			goto retry_journal;
 944		goto out;
 945	}
 946
 947	/*
 948	 * We cannot recurse into the filesystem as the transaction
 949	 * is already started.
 950	 */
 951	flags = memalloc_nofs_save();
 952	page = grab_cache_page_write_begin(mapping, 0);
 953	memalloc_nofs_restore(flags);
 954	if (!page) {
 955		ret = -ENOMEM;
 956		goto out_journal;
 957	}
 958
 959	down_read(&EXT4_I(inode)->xattr_sem);
 960	if (!ext4_has_inline_data(inode)) {
 961		ret = 0;
 962		goto out_release_page;
 963	}
 964
 965	if (!PageUptodate(page)) {
 966		ret = ext4_read_inline_page(inode, page);
 967		if (ret < 0)
 968			goto out_release_page;
 969	}
 970	ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 971					    EXT4_JTR_NONE);
 972	if (ret)
 973		goto out_release_page;
 974
 975	up_read(&EXT4_I(inode)->xattr_sem);
 976	*pagep = page;
 977	brelse(iloc.bh);
 978	return 1;
 979out_release_page:
 980	up_read(&EXT4_I(inode)->xattr_sem);
 981	unlock_page(page);
 982	put_page(page);
 983out_journal:
 984	ext4_journal_stop(handle);
 985out:
 986	brelse(iloc.bh);
 987	return ret;
 988}
 989
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 990#ifdef INLINE_DIR_DEBUG
 991void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 992			  void *inline_start, int inline_size)
 993{
 994	int offset;
 995	unsigned short de_len;
 996	struct ext4_dir_entry_2 *de = inline_start;
 997	void *dlimit = inline_start + inline_size;
 998
 999	trace_printk("inode %lu\n", dir->i_ino);
1000	offset = 0;
1001	while ((void *)de < dlimit) {
1002		de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1003		trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1004			     offset, de_len, de->name_len, de->name,
1005			     de->name_len, le32_to_cpu(de->inode));
1006		if (ext4_check_dir_entry(dir, NULL, de, bh,
1007					 inline_start, inline_size, offset))
1008			BUG();
1009
1010		offset += de_len;
1011		de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1012	}
1013}
1014#else
1015#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1016#endif
1017
1018/*
1019 * Add a new entry into a inline dir.
1020 * It will return -ENOSPC if no space is available, and -EIO
1021 * and -EEXIST if directory entry already exists.
1022 */
1023static int ext4_add_dirent_to_inline(handle_t *handle,
1024				     struct ext4_filename *fname,
1025				     struct inode *dir,
1026				     struct inode *inode,
1027				     struct ext4_iloc *iloc,
1028				     void *inline_start, int inline_size)
1029{
1030	int		err;
1031	struct ext4_dir_entry_2 *de;
1032
1033	err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1034				inline_size, fname, &de);
1035	if (err)
1036		return err;
1037
1038	BUFFER_TRACE(iloc->bh, "get_write_access");
1039	err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1040					    EXT4_JTR_NONE);
1041	if (err)
1042		return err;
1043	ext4_insert_dentry(dir, inode, de, inline_size, fname);
1044
1045	ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1046
1047	/*
1048	 * XXX shouldn't update any times until successful
1049	 * completion of syscall, but too many callers depend
1050	 * on this.
1051	 *
1052	 * XXX similarly, too many callers depend on
1053	 * ext4_new_inode() setting the times, but error
1054	 * recovery deletes the inode, so the worst that can
1055	 * happen is that the times are slightly out of date
1056	 * and/or different from the directory change time.
1057	 */
1058	dir->i_mtime = dir->i_ctime = current_time(dir);
1059	ext4_update_dx_flag(dir);
1060	inode_inc_iversion(dir);
1061	return 1;
1062}
1063
1064static void *ext4_get_inline_xattr_pos(struct inode *inode,
1065				       struct ext4_iloc *iloc)
1066{
1067	struct ext4_xattr_entry *entry;
1068	struct ext4_xattr_ibody_header *header;
1069
1070	BUG_ON(!EXT4_I(inode)->i_inline_off);
1071
1072	header = IHDR(inode, ext4_raw_inode(iloc));
1073	entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1074					    EXT4_I(inode)->i_inline_off);
1075
1076	return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1077}
1078
1079/* Set the final de to cover the whole block. */
1080static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1081{
1082	struct ext4_dir_entry_2 *de, *prev_de;
1083	void *limit;
1084	int de_len;
1085
1086	de = de_buf;
1087	if (old_size) {
1088		limit = de_buf + old_size;
1089		do {
1090			prev_de = de;
1091			de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1092			de_buf += de_len;
1093			de = de_buf;
1094		} while (de_buf < limit);
1095
1096		prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1097							old_size, new_size);
1098	} else {
1099		/* this is just created, so create an empty entry. */
1100		de->inode = 0;
1101		de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1102	}
1103}
1104
1105static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1106				  struct ext4_iloc *iloc)
1107{
1108	int ret;
1109	int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1110	int new_size = get_max_inline_xattr_value_size(dir, iloc);
1111
1112	if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1113		return -ENOSPC;
1114
1115	ret = ext4_update_inline_data(handle, dir,
1116				      new_size + EXT4_MIN_INLINE_DATA_SIZE);
1117	if (ret)
1118		return ret;
1119
1120	ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1121			     EXT4_I(dir)->i_inline_size -
1122						EXT4_MIN_INLINE_DATA_SIZE);
1123	dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1124	return 0;
1125}
1126
1127static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1128				     struct ext4_iloc *iloc,
1129				     void *buf, int inline_size)
1130{
1131	int ret;
1132
1133	ret = ext4_create_inline_data(handle, inode, inline_size);
1134	if (ret) {
1135		ext4_msg(inode->i_sb, KERN_EMERG,
1136			"error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1137			inode->i_ino, ret);
1138		return;
1139	}
1140	ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1141	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1142}
1143
1144static int ext4_finish_convert_inline_dir(handle_t *handle,
1145					  struct inode *inode,
1146					  struct buffer_head *dir_block,
1147					  void *buf,
1148					  int inline_size)
1149{
1150	int err, csum_size = 0, header_size = 0;
1151	struct ext4_dir_entry_2 *de;
1152	void *target = dir_block->b_data;
1153
1154	/*
1155	 * First create "." and ".." and then copy the dir information
1156	 * back to the block.
1157	 */
1158	de = target;
1159	de = ext4_init_dot_dotdot(inode, de,
1160		inode->i_sb->s_blocksize, csum_size,
1161		le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1162	header_size = (void *)de - target;
1163
1164	memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1165		inline_size - EXT4_INLINE_DOTDOT_SIZE);
1166
1167	if (ext4_has_metadata_csum(inode->i_sb))
1168		csum_size = sizeof(struct ext4_dir_entry_tail);
1169
1170	inode->i_size = inode->i_sb->s_blocksize;
1171	i_size_write(inode, inode->i_sb->s_blocksize);
1172	EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1173	ext4_update_final_de(dir_block->b_data,
1174			inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1175			inode->i_sb->s_blocksize - csum_size);
1176
1177	if (csum_size)
1178		ext4_initialize_dirent_tail(dir_block,
1179					    inode->i_sb->s_blocksize);
1180	set_buffer_uptodate(dir_block);
1181	err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1182	if (err)
1183		return err;
1184	set_buffer_verified(dir_block);
1185	return ext4_mark_inode_dirty(handle, inode);
1186}
1187
1188static int ext4_convert_inline_data_nolock(handle_t *handle,
1189					   struct inode *inode,
1190					   struct ext4_iloc *iloc)
1191{
1192	int error;
1193	void *buf = NULL;
1194	struct buffer_head *data_bh = NULL;
1195	struct ext4_map_blocks map;
1196	int inline_size;
1197
1198	inline_size = ext4_get_inline_size(inode);
1199	buf = kmalloc(inline_size, GFP_NOFS);
1200	if (!buf) {
1201		error = -ENOMEM;
1202		goto out;
1203	}
1204
1205	error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1206	if (error < 0)
1207		goto out;
1208
1209	/*
1210	 * Make sure the inline directory entries pass checks before we try to
1211	 * convert them, so that we avoid touching stuff that needs fsck.
1212	 */
1213	if (S_ISDIR(inode->i_mode)) {
1214		error = ext4_check_all_de(inode, iloc->bh,
1215					buf + EXT4_INLINE_DOTDOT_SIZE,
1216					inline_size - EXT4_INLINE_DOTDOT_SIZE);
1217		if (error)
1218			goto out;
1219	}
1220
1221	error = ext4_destroy_inline_data_nolock(handle, inode);
1222	if (error)
1223		goto out;
1224
1225	map.m_lblk = 0;
1226	map.m_len = 1;
1227	map.m_flags = 0;
1228	error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1229	if (error < 0)
1230		goto out_restore;
1231	if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1232		error = -EIO;
1233		goto out_restore;
1234	}
1235
1236	data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1237	if (!data_bh) {
1238		error = -ENOMEM;
1239		goto out_restore;
1240	}
1241
1242	lock_buffer(data_bh);
1243	error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1244					       EXT4_JTR_NONE);
1245	if (error) {
1246		unlock_buffer(data_bh);
1247		error = -EIO;
1248		goto out_restore;
1249	}
1250	memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1251
1252	if (!S_ISDIR(inode->i_mode)) {
1253		memcpy(data_bh->b_data, buf, inline_size);
1254		set_buffer_uptodate(data_bh);
1255		error = ext4_handle_dirty_metadata(handle,
1256						   inode, data_bh);
1257	} else {
1258		error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1259						       buf, inline_size);
1260	}
1261
1262	unlock_buffer(data_bh);
1263out_restore:
1264	if (error)
1265		ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1266
1267out:
1268	brelse(data_bh);
1269	kfree(buf);
1270	return error;
1271}
1272
1273/*
1274 * Try to add the new entry to the inline data.
1275 * If succeeds, return 0. If not, extended the inline dir and copied data to
1276 * the new created block.
1277 */
1278int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1279			      struct inode *dir, struct inode *inode)
1280{
1281	int ret, ret2, inline_size, no_expand;
1282	void *inline_start;
1283	struct ext4_iloc iloc;
1284
1285	ret = ext4_get_inode_loc(dir, &iloc);
1286	if (ret)
1287		return ret;
1288
1289	ext4_write_lock_xattr(dir, &no_expand);
1290	if (!ext4_has_inline_data(dir))
1291		goto out;
1292
1293	inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1294						 EXT4_INLINE_DOTDOT_SIZE;
1295	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1296
1297	ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1298					inline_start, inline_size);
1299	if (ret != -ENOSPC)
1300		goto out;
1301
1302	/* check whether it can be inserted to inline xattr space. */
1303	inline_size = EXT4_I(dir)->i_inline_size -
1304			EXT4_MIN_INLINE_DATA_SIZE;
1305	if (!inline_size) {
1306		/* Try to use the xattr space.*/
1307		ret = ext4_update_inline_dir(handle, dir, &iloc);
1308		if (ret && ret != -ENOSPC)
1309			goto out;
1310
1311		inline_size = EXT4_I(dir)->i_inline_size -
1312				EXT4_MIN_INLINE_DATA_SIZE;
1313	}
1314
1315	if (inline_size) {
1316		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1317
1318		ret = ext4_add_dirent_to_inline(handle, fname, dir,
1319						inode, &iloc, inline_start,
1320						inline_size);
1321
1322		if (ret != -ENOSPC)
1323			goto out;
1324	}
1325
1326	/*
1327	 * The inline space is filled up, so create a new block for it.
1328	 * As the extent tree will be created, we have to save the inline
1329	 * dir first.
1330	 */
1331	ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1332
1333out:
1334	ext4_write_unlock_xattr(dir, &no_expand);
1335	ret2 = ext4_mark_inode_dirty(handle, dir);
1336	if (unlikely(ret2 && !ret))
1337		ret = ret2;
1338	brelse(iloc.bh);
1339	return ret;
1340}
1341
1342/*
1343 * This function fills a red-black tree with information from an
1344 * inlined dir.  It returns the number directory entries loaded
1345 * into the tree.  If there is an error it is returned in err.
1346 */
1347int ext4_inlinedir_to_tree(struct file *dir_file,
1348			   struct inode *dir, ext4_lblk_t block,
1349			   struct dx_hash_info *hinfo,
1350			   __u32 start_hash, __u32 start_minor_hash,
1351			   int *has_inline_data)
1352{
1353	int err = 0, count = 0;
1354	unsigned int parent_ino;
1355	int pos;
1356	struct ext4_dir_entry_2 *de;
1357	struct inode *inode = file_inode(dir_file);
1358	int ret, inline_size = 0;
1359	struct ext4_iloc iloc;
1360	void *dir_buf = NULL;
1361	struct ext4_dir_entry_2 fake;
1362	struct fscrypt_str tmp_str;
1363
1364	ret = ext4_get_inode_loc(inode, &iloc);
1365	if (ret)
1366		return ret;
1367
1368	down_read(&EXT4_I(inode)->xattr_sem);
1369	if (!ext4_has_inline_data(inode)) {
1370		up_read(&EXT4_I(inode)->xattr_sem);
1371		*has_inline_data = 0;
1372		goto out;
1373	}
1374
1375	inline_size = ext4_get_inline_size(inode);
1376	dir_buf = kmalloc(inline_size, GFP_NOFS);
1377	if (!dir_buf) {
1378		ret = -ENOMEM;
1379		up_read(&EXT4_I(inode)->xattr_sem);
1380		goto out;
1381	}
1382
1383	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1384	up_read(&EXT4_I(inode)->xattr_sem);
1385	if (ret < 0)
1386		goto out;
1387
1388	pos = 0;
1389	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1390	while (pos < inline_size) {
1391		/*
1392		 * As inlined dir doesn't store any information about '.' and
1393		 * only the inode number of '..' is stored, we have to handle
1394		 * them differently.
1395		 */
1396		if (pos == 0) {
1397			fake.inode = cpu_to_le32(inode->i_ino);
1398			fake.name_len = 1;
1399			strcpy(fake.name, ".");
1400			fake.rec_len = ext4_rec_len_to_disk(
1401					  ext4_dir_rec_len(fake.name_len, NULL),
1402					  inline_size);
1403			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1404			de = &fake;
1405			pos = EXT4_INLINE_DOTDOT_OFFSET;
1406		} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1407			fake.inode = cpu_to_le32(parent_ino);
1408			fake.name_len = 2;
1409			strcpy(fake.name, "..");
1410			fake.rec_len = ext4_rec_len_to_disk(
1411					  ext4_dir_rec_len(fake.name_len, NULL),
1412					  inline_size);
1413			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1414			de = &fake;
1415			pos = EXT4_INLINE_DOTDOT_SIZE;
1416		} else {
1417			de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1418			pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1419			if (ext4_check_dir_entry(inode, dir_file, de,
1420					 iloc.bh, dir_buf,
1421					 inline_size, pos)) {
1422				ret = count;
1423				goto out;
1424			}
1425		}
1426
1427		if (ext4_hash_in_dirent(dir)) {
1428			hinfo->hash = EXT4_DIRENT_HASH(de);
1429			hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1430		} else {
1431			ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1432		}
1433		if ((hinfo->hash < start_hash) ||
1434		    ((hinfo->hash == start_hash) &&
1435		     (hinfo->minor_hash < start_minor_hash)))
1436			continue;
1437		if (de->inode == 0)
1438			continue;
1439		tmp_str.name = de->name;
1440		tmp_str.len = de->name_len;
1441		err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1442					      hinfo->minor_hash, de, &tmp_str);
1443		if (err) {
1444			ret = err;
1445			goto out;
1446		}
1447		count++;
1448	}
1449	ret = count;
1450out:
1451	kfree(dir_buf);
1452	brelse(iloc.bh);
1453	return ret;
1454}
1455
1456/*
1457 * So this function is called when the volume is mkfsed with
1458 * dir_index disabled. In order to keep f_pos persistent
1459 * after we convert from an inlined dir to a blocked based,
1460 * we just pretend that we are a normal dir and return the
1461 * offset as if '.' and '..' really take place.
1462 *
1463 */
1464int ext4_read_inline_dir(struct file *file,
1465			 struct dir_context *ctx,
1466			 int *has_inline_data)
1467{
1468	unsigned int offset, parent_ino;
1469	int i;
1470	struct ext4_dir_entry_2 *de;
1471	struct super_block *sb;
1472	struct inode *inode = file_inode(file);
1473	int ret, inline_size = 0;
1474	struct ext4_iloc iloc;
1475	void *dir_buf = NULL;
1476	int dotdot_offset, dotdot_size, extra_offset, extra_size;
1477
1478	ret = ext4_get_inode_loc(inode, &iloc);
1479	if (ret)
1480		return ret;
1481
1482	down_read(&EXT4_I(inode)->xattr_sem);
1483	if (!ext4_has_inline_data(inode)) {
1484		up_read(&EXT4_I(inode)->xattr_sem);
1485		*has_inline_data = 0;
1486		goto out;
1487	}
1488
1489	inline_size = ext4_get_inline_size(inode);
1490	dir_buf = kmalloc(inline_size, GFP_NOFS);
1491	if (!dir_buf) {
1492		ret = -ENOMEM;
1493		up_read(&EXT4_I(inode)->xattr_sem);
1494		goto out;
1495	}
1496
1497	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1498	up_read(&EXT4_I(inode)->xattr_sem);
1499	if (ret < 0)
1500		goto out;
1501
1502	ret = 0;
1503	sb = inode->i_sb;
1504	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1505	offset = ctx->pos;
1506
1507	/*
1508	 * dotdot_offset and dotdot_size is the real offset and
1509	 * size for ".." and "." if the dir is block based while
1510	 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1511	 * So we will use extra_offset and extra_size to indicate them
1512	 * during the inline dir iteration.
1513	 */
1514	dotdot_offset = ext4_dir_rec_len(1, NULL);
1515	dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1516	extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1517	extra_size = extra_offset + inline_size;
1518
1519	/*
1520	 * If the version has changed since the last call to
1521	 * readdir(2), then we might be pointing to an invalid
1522	 * dirent right now.  Scan from the start of the inline
1523	 * dir to make sure.
1524	 */
1525	if (!inode_eq_iversion(inode, file->f_version)) {
1526		for (i = 0; i < extra_size && i < offset;) {
1527			/*
1528			 * "." is with offset 0 and
1529			 * ".." is dotdot_offset.
1530			 */
1531			if (!i) {
1532				i = dotdot_offset;
1533				continue;
1534			} else if (i == dotdot_offset) {
1535				i = dotdot_size;
1536				continue;
1537			}
1538			/* for other entry, the real offset in
1539			 * the buf has to be tuned accordingly.
1540			 */
1541			de = (struct ext4_dir_entry_2 *)
1542				(dir_buf + i - extra_offset);
1543			/* It's too expensive to do a full
1544			 * dirent test each time round this
1545			 * loop, but we do have to test at
1546			 * least that it is non-zero.  A
1547			 * failure will be detected in the
1548			 * dirent test below. */
1549			if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1550				< ext4_dir_rec_len(1, NULL))
1551				break;
1552			i += ext4_rec_len_from_disk(de->rec_len,
1553						    extra_size);
1554		}
1555		offset = i;
1556		ctx->pos = offset;
1557		file->f_version = inode_query_iversion(inode);
1558	}
1559
1560	while (ctx->pos < extra_size) {
1561		if (ctx->pos == 0) {
1562			if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1563				goto out;
1564			ctx->pos = dotdot_offset;
1565			continue;
1566		}
1567
1568		if (ctx->pos == dotdot_offset) {
1569			if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1570				goto out;
1571			ctx->pos = dotdot_size;
1572			continue;
1573		}
1574
1575		de = (struct ext4_dir_entry_2 *)
1576			(dir_buf + ctx->pos - extra_offset);
1577		if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1578					 extra_size, ctx->pos))
1579			goto out;
1580		if (le32_to_cpu(de->inode)) {
1581			if (!dir_emit(ctx, de->name, de->name_len,
1582				      le32_to_cpu(de->inode),
1583				      get_dtype(sb, de->file_type)))
1584				goto out;
1585		}
1586		ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1587	}
1588out:
1589	kfree(dir_buf);
1590	brelse(iloc.bh);
1591	return ret;
1592}
1593
1594void *ext4_read_inline_link(struct inode *inode)
1595{
1596	struct ext4_iloc iloc;
1597	int ret, inline_size;
1598	void *link;
1599
1600	ret = ext4_get_inode_loc(inode, &iloc);
1601	if (ret)
1602		return ERR_PTR(ret);
1603
1604	ret = -ENOMEM;
1605	inline_size = ext4_get_inline_size(inode);
1606	link = kmalloc(inline_size + 1, GFP_NOFS);
1607	if (!link)
1608		goto out;
1609
1610	ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1611	if (ret < 0) {
1612		kfree(link);
1613		goto out;
1614	}
1615	nd_terminate_link(link, inode->i_size, ret);
1616out:
1617	if (ret < 0)
1618		link = ERR_PTR(ret);
1619	brelse(iloc.bh);
1620	return link;
1621}
1622
1623struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1624					struct ext4_dir_entry_2 **parent_de,
1625					int *retval)
1626{
1627	struct ext4_iloc iloc;
1628
1629	*retval = ext4_get_inode_loc(inode, &iloc);
1630	if (*retval)
1631		return NULL;
1632
1633	*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1634
1635	return iloc.bh;
1636}
1637
1638/*
1639 * Try to create the inline data for the new dir.
1640 * If it succeeds, return 0, otherwise return the error.
1641 * In case of ENOSPC, the caller should create the normal disk layout dir.
1642 */
1643int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1644			       struct inode *inode)
1645{
1646	int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1647	struct ext4_iloc iloc;
1648	struct ext4_dir_entry_2 *de;
1649
1650	ret = ext4_get_inode_loc(inode, &iloc);
1651	if (ret)
1652		return ret;
1653
1654	ret = ext4_prepare_inline_data(handle, inode, inline_size);
1655	if (ret)
1656		goto out;
1657
1658	/*
1659	 * For inline dir, we only save the inode information for the ".."
1660	 * and create a fake dentry to cover the left space.
1661	 */
1662	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1663	de->inode = cpu_to_le32(parent->i_ino);
1664	de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1665	de->inode = 0;
1666	de->rec_len = ext4_rec_len_to_disk(
1667				inline_size - EXT4_INLINE_DOTDOT_SIZE,
1668				inline_size);
1669	set_nlink(inode, 2);
1670	inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1671out:
1672	brelse(iloc.bh);
1673	return ret;
1674}
1675
1676struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1677					struct ext4_filename *fname,
1678					struct ext4_dir_entry_2 **res_dir,
1679					int *has_inline_data)
1680{
1681	int ret;
1682	struct ext4_iloc iloc;
1683	void *inline_start;
1684	int inline_size;
1685
1686	if (ext4_get_inode_loc(dir, &iloc))
1687		return NULL;
1688
1689	down_read(&EXT4_I(dir)->xattr_sem);
1690	if (!ext4_has_inline_data(dir)) {
1691		*has_inline_data = 0;
1692		goto out;
1693	}
1694
1695	inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1696						EXT4_INLINE_DOTDOT_SIZE;
1697	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1698	ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1699			      dir, fname, 0, res_dir);
1700	if (ret == 1)
1701		goto out_find;
1702	if (ret < 0)
1703		goto out;
1704
1705	if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1706		goto out;
1707
1708	inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1709	inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1710
1711	ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1712			      dir, fname, 0, res_dir);
1713	if (ret == 1)
1714		goto out_find;
1715
1716out:
1717	brelse(iloc.bh);
1718	iloc.bh = NULL;
1719out_find:
1720	up_read(&EXT4_I(dir)->xattr_sem);
1721	return iloc.bh;
1722}
1723
1724int ext4_delete_inline_entry(handle_t *handle,
1725			     struct inode *dir,
1726			     struct ext4_dir_entry_2 *de_del,
1727			     struct buffer_head *bh,
1728			     int *has_inline_data)
1729{
1730	int err, inline_size, no_expand;
1731	struct ext4_iloc iloc;
1732	void *inline_start;
1733
1734	err = ext4_get_inode_loc(dir, &iloc);
1735	if (err)
1736		return err;
1737
1738	ext4_write_lock_xattr(dir, &no_expand);
1739	if (!ext4_has_inline_data(dir)) {
1740		*has_inline_data = 0;
1741		goto out;
1742	}
1743
1744	if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1745		EXT4_MIN_INLINE_DATA_SIZE) {
1746		inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1747					EXT4_INLINE_DOTDOT_SIZE;
1748		inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1749				EXT4_INLINE_DOTDOT_SIZE;
1750	} else {
1751		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1752		inline_size = ext4_get_inline_size(dir) -
1753				EXT4_MIN_INLINE_DATA_SIZE;
1754	}
1755
1756	BUFFER_TRACE(bh, "get_write_access");
1757	err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1758					    EXT4_JTR_NONE);
1759	if (err)
1760		goto out;
1761
1762	err = ext4_generic_delete_entry(dir, de_del, bh,
1763					inline_start, inline_size, 0);
1764	if (err)
1765		goto out;
1766
1767	ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1768out:
1769	ext4_write_unlock_xattr(dir, &no_expand);
1770	if (likely(err == 0))
1771		err = ext4_mark_inode_dirty(handle, dir);
1772	brelse(iloc.bh);
1773	if (err != -ENOENT)
1774		ext4_std_error(dir->i_sb, err);
1775	return err;
1776}
1777
1778/*
1779 * Get the inline dentry at offset.
1780 */
1781static inline struct ext4_dir_entry_2 *
1782ext4_get_inline_entry(struct inode *inode,
1783		      struct ext4_iloc *iloc,
1784		      unsigned int offset,
1785		      void **inline_start,
1786		      int *inline_size)
1787{
1788	void *inline_pos;
1789
1790	BUG_ON(offset > ext4_get_inline_size(inode));
1791
1792	if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1793		inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1794		*inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1795	} else {
1796		inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1797		offset -= EXT4_MIN_INLINE_DATA_SIZE;
1798		*inline_size = ext4_get_inline_size(inode) -
1799				EXT4_MIN_INLINE_DATA_SIZE;
1800	}
1801
1802	if (inline_start)
1803		*inline_start = inline_pos;
1804	return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1805}
1806
1807bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1808{
1809	int err, inline_size;
1810	struct ext4_iloc iloc;
1811	size_t inline_len;
1812	void *inline_pos;
1813	unsigned int offset;
1814	struct ext4_dir_entry_2 *de;
1815	bool ret = false;
1816
1817	err = ext4_get_inode_loc(dir, &iloc);
1818	if (err) {
1819		EXT4_ERROR_INODE_ERR(dir, -err,
1820				     "error %d getting inode %lu block",
1821				     err, dir->i_ino);
1822		return false;
1823	}
1824
1825	down_read(&EXT4_I(dir)->xattr_sem);
1826	if (!ext4_has_inline_data(dir)) {
1827		*has_inline_data = 0;
1828		ret = true;
1829		goto out;
1830	}
1831
1832	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1833	if (!le32_to_cpu(de->inode)) {
1834		ext4_warning(dir->i_sb,
1835			     "bad inline directory (dir #%lu) - no `..'",
1836			     dir->i_ino);
 
1837		goto out;
1838	}
1839
1840	inline_len = ext4_get_inline_size(dir);
1841	offset = EXT4_INLINE_DOTDOT_SIZE;
1842	while (offset < inline_len) {
1843		de = ext4_get_inline_entry(dir, &iloc, offset,
1844					   &inline_pos, &inline_size);
1845		if (ext4_check_dir_entry(dir, NULL, de,
1846					 iloc.bh, inline_pos,
1847					 inline_size, offset)) {
1848			ext4_warning(dir->i_sb,
1849				     "bad inline directory (dir #%lu) - "
1850				     "inode %u, rec_len %u, name_len %d"
1851				     "inline size %d",
1852				     dir->i_ino, le32_to_cpu(de->inode),
1853				     le16_to_cpu(de->rec_len), de->name_len,
1854				     inline_size);
 
1855			goto out;
1856		}
1857		if (le32_to_cpu(de->inode)) {
 
1858			goto out;
1859		}
1860		offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1861	}
1862
1863	ret = true;
1864out:
1865	up_read(&EXT4_I(dir)->xattr_sem);
1866	brelse(iloc.bh);
1867	return ret;
1868}
1869
1870int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1871{
1872	int ret, no_expand;
1873
1874	ext4_write_lock_xattr(inode, &no_expand);
1875	ret = ext4_destroy_inline_data_nolock(handle, inode);
1876	ext4_write_unlock_xattr(inode, &no_expand);
1877
1878	return ret;
1879}
1880
1881int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1882{
1883	__u64 addr;
1884	int error = -EAGAIN;
1885	struct ext4_iloc iloc;
1886
1887	down_read(&EXT4_I(inode)->xattr_sem);
1888	if (!ext4_has_inline_data(inode))
1889		goto out;
1890
1891	error = ext4_get_inode_loc(inode, &iloc);
1892	if (error)
1893		goto out;
1894
1895	addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1896	addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1897	addr += offsetof(struct ext4_inode, i_block);
1898
1899	brelse(iloc.bh);
1900
1901	iomap->addr = addr;
1902	iomap->offset = 0;
1903	iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1904			      i_size_read(inode));
1905	iomap->type = IOMAP_INLINE;
1906	iomap->flags = 0;
1907
1908out:
1909	up_read(&EXT4_I(inode)->xattr_sem);
1910	return error;
1911}
1912
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1913int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1914{
1915	handle_t *handle;
1916	int inline_size, value_len, needed_blocks, no_expand, err = 0;
1917	size_t i_size;
1918	void *value = NULL;
1919	struct ext4_xattr_ibody_find is = {
1920		.s = { .not_found = -ENODATA, },
1921	};
1922	struct ext4_xattr_info i = {
1923		.name_index = EXT4_XATTR_INDEX_SYSTEM,
1924		.name = EXT4_XATTR_SYSTEM_DATA,
1925	};
1926
1927
1928	needed_blocks = ext4_writepage_trans_blocks(inode);
1929	handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1930	if (IS_ERR(handle))
1931		return PTR_ERR(handle);
1932
1933	ext4_write_lock_xattr(inode, &no_expand);
1934	if (!ext4_has_inline_data(inode)) {
1935		ext4_write_unlock_xattr(inode, &no_expand);
1936		*has_inline = 0;
1937		ext4_journal_stop(handle);
1938		return 0;
1939	}
1940
1941	if ((err = ext4_orphan_add(handle, inode)) != 0)
1942		goto out;
1943
1944	if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1945		goto out;
1946
1947	down_write(&EXT4_I(inode)->i_data_sem);
1948	i_size = inode->i_size;
1949	inline_size = ext4_get_inline_size(inode);
1950	EXT4_I(inode)->i_disksize = i_size;
1951
1952	if (i_size < inline_size) {
1953		/*
1954		 * if there's inline data to truncate and this file was
1955		 * converted to extents after that inline data was written,
1956		 * the extent status cache must be cleared to avoid leaving
1957		 * behind stale delayed allocated extent entries
1958		 */
1959		if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1960retry:
1961			err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1962			if (err == -ENOMEM) {
1963				memalloc_retry_wait(GFP_ATOMIC);
1964				goto retry;
1965			}
1966			if (err)
1967				goto out_error;
1968		}
1969
1970		/* Clear the content in the xattr space. */
1971		if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1972			if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1973				goto out_error;
1974
1975			BUG_ON(is.s.not_found);
1976
1977			value_len = le32_to_cpu(is.s.here->e_value_size);
1978			value = kmalloc(value_len, GFP_NOFS);
1979			if (!value) {
1980				err = -ENOMEM;
1981				goto out_error;
1982			}
1983
1984			err = ext4_xattr_ibody_get(inode, i.name_index,
1985						   i.name, value, value_len);
1986			if (err <= 0)
1987				goto out_error;
1988
1989			i.value = value;
1990			i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1991					i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1992			err = ext4_xattr_ibody_set(handle, inode, &i, &is);
 
1993			if (err)
1994				goto out_error;
1995		}
1996
1997		/* Clear the content within i_blocks. */
1998		if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1999			void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
2000			memset(p + i_size, 0,
2001			       EXT4_MIN_INLINE_DATA_SIZE - i_size);
2002		}
2003
2004		EXT4_I(inode)->i_inline_size = i_size <
2005					EXT4_MIN_INLINE_DATA_SIZE ?
2006					EXT4_MIN_INLINE_DATA_SIZE : i_size;
2007	}
2008
2009out_error:
2010	up_write(&EXT4_I(inode)->i_data_sem);
2011out:
2012	brelse(is.iloc.bh);
2013	ext4_write_unlock_xattr(inode, &no_expand);
2014	kfree(value);
2015	if (inode->i_nlink)
2016		ext4_orphan_del(handle, inode);
2017
2018	if (err == 0) {
2019		inode->i_mtime = inode->i_ctime = current_time(inode);
2020		err = ext4_mark_inode_dirty(handle, inode);
2021		if (IS_SYNC(inode))
2022			ext4_handle_sync(handle);
2023	}
2024	ext4_journal_stop(handle);
2025	return err;
2026}
2027
2028int ext4_convert_inline_data(struct inode *inode)
2029{
2030	int error, needed_blocks, no_expand;
2031	handle_t *handle;
2032	struct ext4_iloc iloc;
2033
2034	if (!ext4_has_inline_data(inode)) {
2035		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2036		return 0;
2037	} else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2038		/*
2039		 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2040		 * cleared. This means we are in the middle of moving of
2041		 * inline data to delay allocated block. Just force writeout
2042		 * here to finish conversion.
2043		 */
2044		error = filemap_flush(inode->i_mapping);
2045		if (error)
2046			return error;
2047		if (!ext4_has_inline_data(inode))
2048			return 0;
2049	}
2050
2051	needed_blocks = ext4_writepage_trans_blocks(inode);
2052
2053	iloc.bh = NULL;
2054	error = ext4_get_inode_loc(inode, &iloc);
2055	if (error)
2056		return error;
2057
2058	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2059	if (IS_ERR(handle)) {
2060		error = PTR_ERR(handle);
2061		goto out_free;
2062	}
2063
2064	ext4_write_lock_xattr(inode, &no_expand);
2065	if (ext4_has_inline_data(inode))
2066		error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2067	ext4_write_unlock_xattr(inode, &no_expand);
2068	ext4_journal_stop(handle);
2069out_free:
2070	brelse(iloc.bh);
2071	return error;
2072}