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	void *end;
  38	int free, min_offs;
  39
  40	if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  41		return 0;
  42
  43	min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  44			EXT4_GOOD_OLD_INODE_SIZE -
  45			EXT4_I(inode)->i_extra_isize -
  46			sizeof(struct ext4_xattr_ibody_header);
  47
  48	/*
  49	 * We need to subtract another sizeof(__u32) since an in-inode xattr
  50	 * needs an empty 4 bytes to indicate the gap between the xattr entry
  51	 * and the name/value pair.
  52	 */
  53	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  54		return EXT4_XATTR_SIZE(min_offs -
  55			EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  56			EXT4_XATTR_ROUND - sizeof(__u32));
  57
  58	raw_inode = ext4_raw_inode(iloc);
  59	header = IHDR(inode, raw_inode);
  60	entry = IFIRST(header);
  61	end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
  62
  63	/* Compute min_offs. */
  64	while (!IS_LAST_ENTRY(entry)) {
  65		void *next = EXT4_XATTR_NEXT(entry);
  66
  67		if (next >= end) {
  68			EXT4_ERROR_INODE(inode,
  69					 "corrupt xattr in inline inode");
  70			return 0;
  71		}
  72		if (!entry->e_value_inum && entry->e_value_size) {
  73			size_t offs = le16_to_cpu(entry->e_value_offs);
  74			if (offs < min_offs)
  75				min_offs = offs;
  76		}
  77		entry = next;
  78	}
  79	free = min_offs -
  80		((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  81
  82	if (EXT4_I(inode)->i_inline_off) {
  83		entry = (struct ext4_xattr_entry *)
  84			((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  85
  86		free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  87		goto out;
  88	}
  89
  90	free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  91
  92	if (free > EXT4_XATTR_ROUND)
  93		free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  94	else
  95		free = 0;
  96
  97out:
  98	return free;
  99}
 100
 101/*
 102 * Get the maximum size we now can store in an inode.
 103 * If we can't find the space for a xattr entry, don't use the space
 104 * of the extents since we have no space to indicate the inline data.
 105 */
 106int ext4_get_max_inline_size(struct inode *inode)
 107{
 108	int error, max_inline_size;
 109	struct ext4_iloc iloc;
 110
 111	if (EXT4_I(inode)->i_extra_isize == 0)
 112		return 0;
 113
 114	error = ext4_get_inode_loc(inode, &iloc);
 115	if (error) {
 116		ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 117				     "can't get inode location %lu",
 118				     inode->i_ino);
 119		return 0;
 120	}
 121
 122	down_read(&EXT4_I(inode)->xattr_sem);
 123	max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 124	up_read(&EXT4_I(inode)->xattr_sem);
 125
 126	brelse(iloc.bh);
 127
 128	if (!max_inline_size)
 129		return 0;
 130
 131	return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 132}
 133
 134/*
 135 * this function does not take xattr_sem, which is OK because it is
 136 * currently only used in a code path coming form ext4_iget, before
 137 * the new inode has been unlocked
 138 */
 139int ext4_find_inline_data_nolock(struct inode *inode)
 140{
 141	struct ext4_xattr_ibody_find is = {
 142		.s = { .not_found = -ENODATA, },
 143	};
 144	struct ext4_xattr_info i = {
 145		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 146		.name = EXT4_XATTR_SYSTEM_DATA,
 147	};
 148	int error;
 149
 150	if (EXT4_I(inode)->i_extra_isize == 0)
 151		return 0;
 152
 153	error = ext4_get_inode_loc(inode, &is.iloc);
 154	if (error)
 155		return error;
 156
 157	error = ext4_xattr_ibody_find(inode, &i, &is);
 158	if (error)
 159		goto out;
 160
 161	if (!is.s.not_found) {
 162		if (is.s.here->e_value_inum) {
 163			EXT4_ERROR_INODE(inode, "inline data xattr refers "
 164					 "to an external xattr inode");
 165			error = -EFSCORRUPTED;
 166			goto out;
 167		}
 168		EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 169					(void *)ext4_raw_inode(&is.iloc));
 170		EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 171				le32_to_cpu(is.s.here->e_value_size);
 
 172	}
 173out:
 174	brelse(is.iloc.bh);
 175	return error;
 176}
 177
 178static int ext4_read_inline_data(struct inode *inode, void *buffer,
 179				 unsigned int len,
 180				 struct ext4_iloc *iloc)
 181{
 182	struct ext4_xattr_entry *entry;
 183	struct ext4_xattr_ibody_header *header;
 184	int cp_len = 0;
 185	struct ext4_inode *raw_inode;
 186
 187	if (!len)
 188		return 0;
 189
 190	BUG_ON(len > EXT4_I(inode)->i_inline_size);
 191
 192	cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
 
 193
 194	raw_inode = ext4_raw_inode(iloc);
 195	memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 196
 197	len -= cp_len;
 198	buffer += cp_len;
 199
 200	if (!len)
 201		goto out;
 202
 203	header = IHDR(inode, raw_inode);
 204	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 205					    EXT4_I(inode)->i_inline_off);
 206	len = min_t(unsigned int, len,
 207		    (unsigned int)le32_to_cpu(entry->e_value_size));
 208
 209	memcpy(buffer,
 210	       (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 211	cp_len += len;
 212
 213out:
 214	return cp_len;
 215}
 216
 217/*
 218 * write the buffer to the inline inode.
 219 * If 'create' is set, we don't need to do the extra copy in the xattr
 220 * value since it is already handled by ext4_xattr_ibody_set.
 221 * That saves us one memcpy.
 222 */
 223static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 224				   void *buffer, loff_t pos, unsigned int len)
 225{
 226	struct ext4_xattr_entry *entry;
 227	struct ext4_xattr_ibody_header *header;
 228	struct ext4_inode *raw_inode;
 229	int cp_len = 0;
 230
 231	if (unlikely(ext4_forced_shutdown(inode->i_sb)))
 232		return;
 233
 234	BUG_ON(!EXT4_I(inode)->i_inline_off);
 235	BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 236
 237	raw_inode = ext4_raw_inode(iloc);
 238	buffer += pos;
 239
 240	if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 241		cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 242			 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 243		memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 244
 245		len -= cp_len;
 246		buffer += cp_len;
 247		pos += cp_len;
 248	}
 249
 250	if (!len)
 251		return;
 252
 253	pos -= EXT4_MIN_INLINE_DATA_SIZE;
 254	header = IHDR(inode, raw_inode);
 255	entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 256					    EXT4_I(inode)->i_inline_off);
 257
 258	memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 259	       buffer, len);
 260}
 261
 262static int ext4_create_inline_data(handle_t *handle,
 263				   struct inode *inode, unsigned len)
 264{
 265	int error;
 266	void *value = NULL;
 267	struct ext4_xattr_ibody_find is = {
 268		.s = { .not_found = -ENODATA, },
 269	};
 270	struct ext4_xattr_info i = {
 271		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 272		.name = EXT4_XATTR_SYSTEM_DATA,
 273	};
 274
 275	error = ext4_get_inode_loc(inode, &is.iloc);
 276	if (error)
 277		return error;
 278
 279	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 280	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 281					      EXT4_JTR_NONE);
 282	if (error)
 283		goto out;
 284
 285	if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 286		value = EXT4_ZERO_XATTR_VALUE;
 287		len -= EXT4_MIN_INLINE_DATA_SIZE;
 288	} else {
 289		value = "";
 290		len = 0;
 291	}
 292
 293	/* Insert the xttr entry. */
 294	i.value = value;
 295	i.value_len = len;
 296
 297	error = ext4_xattr_ibody_find(inode, &i, &is);
 298	if (error)
 299		goto out;
 300
 301	BUG_ON(!is.s.not_found);
 302
 303	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 304	if (error) {
 305		if (error == -ENOSPC)
 306			ext4_clear_inode_state(inode,
 307					       EXT4_STATE_MAY_INLINE_DATA);
 308		goto out;
 309	}
 310
 311	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 312		0, EXT4_MIN_INLINE_DATA_SIZE);
 313
 314	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 315				      (void *)ext4_raw_inode(&is.iloc));
 316	EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 317	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 318	ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 319	get_bh(is.iloc.bh);
 320	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 321
 322out:
 323	brelse(is.iloc.bh);
 324	return error;
 325}
 326
 327static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 328				   unsigned int len)
 329{
 330	int error;
 331	void *value = NULL;
 332	struct ext4_xattr_ibody_find is = {
 333		.s = { .not_found = -ENODATA, },
 334	};
 335	struct ext4_xattr_info i = {
 336		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 337		.name = EXT4_XATTR_SYSTEM_DATA,
 338	};
 339
 340	/* If the old space is ok, write the data directly. */
 341	if (len <= EXT4_I(inode)->i_inline_size)
 342		return 0;
 343
 344	error = ext4_get_inode_loc(inode, &is.iloc);
 345	if (error)
 346		return error;
 347
 348	error = ext4_xattr_ibody_find(inode, &i, &is);
 349	if (error)
 350		goto out;
 351
 352	BUG_ON(is.s.not_found);
 353
 354	len -= EXT4_MIN_INLINE_DATA_SIZE;
 355	value = kzalloc(len, GFP_NOFS);
 356	if (!value) {
 357		error = -ENOMEM;
 358		goto out;
 359	}
 360
 361	error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 362				     value, len);
 363	if (error < 0)
 364		goto out;
 365
 366	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 367	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 368					      EXT4_JTR_NONE);
 369	if (error)
 370		goto out;
 371
 372	/* Update the xattr entry. */
 373	i.value = value;
 374	i.value_len = len;
 375
 376	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 377	if (error)
 378		goto out;
 379
 380	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 381				      (void *)ext4_raw_inode(&is.iloc));
 382	EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 383				le32_to_cpu(is.s.here->e_value_size);
 384	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 385	get_bh(is.iloc.bh);
 386	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 387
 388out:
 389	kfree(value);
 390	brelse(is.iloc.bh);
 391	return error;
 392}
 393
 394static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 395				    unsigned int len)
 396{
 397	int ret, size, no_expand;
 398	struct ext4_inode_info *ei = EXT4_I(inode);
 399
 400	if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 401		return -ENOSPC;
 402
 403	size = ext4_get_max_inline_size(inode);
 404	if (size < len)
 405		return -ENOSPC;
 406
 407	ext4_write_lock_xattr(inode, &no_expand);
 408
 409	if (ei->i_inline_off)
 410		ret = ext4_update_inline_data(handle, inode, len);
 411	else
 412		ret = ext4_create_inline_data(handle, inode, len);
 413
 414	ext4_write_unlock_xattr(inode, &no_expand);
 415	return ret;
 416}
 417
 418static int ext4_destroy_inline_data_nolock(handle_t *handle,
 419					   struct inode *inode)
 420{
 421	struct ext4_inode_info *ei = EXT4_I(inode);
 422	struct ext4_xattr_ibody_find is = {
 423		.s = { .not_found = 0, },
 424	};
 425	struct ext4_xattr_info i = {
 426		.name_index = EXT4_XATTR_INDEX_SYSTEM,
 427		.name = EXT4_XATTR_SYSTEM_DATA,
 428		.value = NULL,
 429		.value_len = 0,
 430	};
 431	int error;
 432
 433	if (!ei->i_inline_off)
 434		return 0;
 435
 436	error = ext4_get_inode_loc(inode, &is.iloc);
 437	if (error)
 438		return error;
 439
 440	error = ext4_xattr_ibody_find(inode, &i, &is);
 441	if (error)
 442		goto out;
 443
 444	BUFFER_TRACE(is.iloc.bh, "get_write_access");
 445	error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 446					      EXT4_JTR_NONE);
 447	if (error)
 448		goto out;
 449
 450	error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 451	if (error)
 452		goto out;
 453
 454	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 455		0, EXT4_MIN_INLINE_DATA_SIZE);
 456	memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 457
 458	if (ext4_has_feature_extents(inode->i_sb)) {
 459		if (S_ISDIR(inode->i_mode) ||
 460		    S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 461			ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 462			ext4_ext_tree_init(handle, inode);
 463		}
 464	}
 465	ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 466
 467	get_bh(is.iloc.bh);
 468	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 469
 470	EXT4_I(inode)->i_inline_off = 0;
 471	EXT4_I(inode)->i_inline_size = 0;
 472	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 473out:
 474	brelse(is.iloc.bh);
 475	if (error == -ENODATA)
 476		error = 0;
 477	return error;
 478}
 479
 480static int ext4_read_inline_folio(struct inode *inode, struct folio *folio)
 481{
 482	void *kaddr;
 483	int ret = 0;
 484	size_t len;
 485	struct ext4_iloc iloc;
 486
 487	BUG_ON(!folio_test_locked(folio));
 488	BUG_ON(!ext4_has_inline_data(inode));
 489	BUG_ON(folio->index);
 490
 491	if (!EXT4_I(inode)->i_inline_off) {
 492		ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 493			     inode->i_ino);
 494		goto out;
 495	}
 496
 497	ret = ext4_get_inode_loc(inode, &iloc);
 498	if (ret)
 499		goto out;
 500
 501	len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 502	BUG_ON(len > PAGE_SIZE);
 503	kaddr = kmap_local_folio(folio, 0);
 504	ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 505	kaddr = folio_zero_tail(folio, len, kaddr + len);
 506	kunmap_local(kaddr);
 507	folio_mark_uptodate(folio);
 
 508	brelse(iloc.bh);
 509
 510out:
 511	return ret;
 512}
 513
 514int ext4_readpage_inline(struct inode *inode, struct folio *folio)
 515{
 516	int ret = 0;
 517
 518	down_read(&EXT4_I(inode)->xattr_sem);
 519	if (!ext4_has_inline_data(inode)) {
 520		up_read(&EXT4_I(inode)->xattr_sem);
 521		return -EAGAIN;
 522	}
 523
 524	/*
 525	 * Current inline data can only exist in the 1st page,
 526	 * So for all the other pages, just set them uptodate.
 527	 */
 528	if (!folio->index)
 529		ret = ext4_read_inline_folio(inode, folio);
 530	else if (!folio_test_uptodate(folio)) {
 531		folio_zero_segment(folio, 0, folio_size(folio));
 532		folio_mark_uptodate(folio);
 533	}
 534
 535	up_read(&EXT4_I(inode)->xattr_sem);
 536
 537	folio_unlock(folio);
 538	return ret >= 0 ? 0 : ret;
 539}
 540
 541static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 542					      struct inode *inode)
 
 543{
 544	int ret, needed_blocks, no_expand;
 545	handle_t *handle = NULL;
 546	int retries = 0, sem_held = 0;
 547	struct folio *folio = NULL;
 548	unsigned from, to;
 549	struct ext4_iloc iloc;
 550
 551	if (!ext4_has_inline_data(inode)) {
 552		/*
 553		 * clear the flag so that no new write
 554		 * will trap here again.
 555		 */
 556		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 557		return 0;
 558	}
 559
 560	needed_blocks = ext4_writepage_trans_blocks(inode);
 561
 562	ret = ext4_get_inode_loc(inode, &iloc);
 563	if (ret)
 564		return ret;
 565
 566retry:
 567	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 568	if (IS_ERR(handle)) {
 569		ret = PTR_ERR(handle);
 570		handle = NULL;
 571		goto out;
 572	}
 573
 574	/* We cannot recurse into the filesystem as the transaction is already
 575	 * started */
 576	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 577			mapping_gfp_mask(mapping));
 578	if (IS_ERR(folio)) {
 579		ret = PTR_ERR(folio);
 580		goto out_nofolio;
 
 581	}
 582
 583	ext4_write_lock_xattr(inode, &no_expand);
 584	sem_held = 1;
 585	/* If some one has already done this for us, just exit. */
 586	if (!ext4_has_inline_data(inode)) {
 587		ret = 0;
 588		goto out;
 589	}
 590
 591	from = 0;
 592	to = ext4_get_inline_size(inode);
 593	if (!folio_test_uptodate(folio)) {
 594		ret = ext4_read_inline_folio(inode, folio);
 595		if (ret < 0)
 596			goto out;
 597	}
 598
 599	ret = ext4_destroy_inline_data_nolock(handle, inode);
 600	if (ret)
 601		goto out;
 602
 603	if (ext4_should_dioread_nolock(inode)) {
 604		ret = ext4_block_write_begin(handle, folio, from, to,
 605					     ext4_get_block_unwritten);
 606	} else
 607		ret = ext4_block_write_begin(handle, folio, from, to,
 608					     ext4_get_block);
 609
 610	if (!ret && ext4_should_journal_data(inode)) {
 611		ret = ext4_walk_page_buffers(handle, inode,
 612					     folio_buffers(folio), from, to,
 613					     NULL, do_journal_get_write_access);
 614	}
 615
 616	if (ret) {
 617		folio_unlock(folio);
 618		folio_put(folio);
 619		folio = NULL;
 620		ext4_orphan_add(handle, inode);
 621		ext4_write_unlock_xattr(inode, &no_expand);
 622		sem_held = 0;
 623		ext4_journal_stop(handle);
 624		handle = NULL;
 625		ext4_truncate_failed_write(inode);
 626		/*
 627		 * If truncate failed early the inode might
 628		 * still be on the orphan list; we need to
 629		 * make sure the inode is removed from the
 630		 * orphan list in that case.
 631		 */
 632		if (inode->i_nlink)
 633			ext4_orphan_del(NULL, inode);
 634	}
 635
 636	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 637		goto retry;
 638
 639	if (folio)
 640		block_commit_write(&folio->page, from, to);
 641out:
 642	if (folio) {
 643		folio_unlock(folio);
 644		folio_put(folio);
 645	}
 646out_nofolio:
 647	if (sem_held)
 648		ext4_write_unlock_xattr(inode, &no_expand);
 649	if (handle)
 650		ext4_journal_stop(handle);
 651	brelse(iloc.bh);
 652	return ret;
 653}
 654
 655/*
 656 * Try to write data in the inode.
 657 * If the inode has inline data, check whether the new write can be
 658 * in the inode also. If not, create the page the handle, move the data
 659 * to the page make it update and let the later codes create extent for it.
 660 */
 661int ext4_try_to_write_inline_data(struct address_space *mapping,
 662				  struct inode *inode,
 663				  loff_t pos, unsigned len,
 664				  struct folio **foliop)
 
 665{
 666	int ret;
 667	handle_t *handle;
 668	struct folio *folio;
 669	struct ext4_iloc iloc;
 670
 671	if (pos + len > ext4_get_max_inline_size(inode))
 672		goto convert;
 673
 674	ret = ext4_get_inode_loc(inode, &iloc);
 675	if (ret)
 676		return ret;
 677
 678	/*
 679	 * The possible write could happen in the inode,
 680	 * so try to reserve the space in inode first.
 681	 */
 682	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 683	if (IS_ERR(handle)) {
 684		ret = PTR_ERR(handle);
 685		handle = NULL;
 686		goto out;
 687	}
 688
 689	ret = ext4_prepare_inline_data(handle, inode, pos + len);
 690	if (ret && ret != -ENOSPC)
 691		goto out;
 692
 693	/* We don't have space in inline inode, so convert it to extent. */
 694	if (ret == -ENOSPC) {
 695		ext4_journal_stop(handle);
 696		brelse(iloc.bh);
 697		goto convert;
 698	}
 699
 700	ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 701					    EXT4_JTR_NONE);
 702	if (ret)
 703		goto out;
 704
 705	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 706					mapping_gfp_mask(mapping));
 707	if (IS_ERR(folio)) {
 708		ret = PTR_ERR(folio);
 709		goto out;
 710	}
 711
 712	*foliop = folio;
 713	down_read(&EXT4_I(inode)->xattr_sem);
 714	if (!ext4_has_inline_data(inode)) {
 715		ret = 0;
 716		folio_unlock(folio);
 717		folio_put(folio);
 718		goto out_up_read;
 719	}
 720
 721	if (!folio_test_uptodate(folio)) {
 722		ret = ext4_read_inline_folio(inode, folio);
 723		if (ret < 0) {
 724			folio_unlock(folio);
 725			folio_put(folio);
 726			goto out_up_read;
 727		}
 728	}
 729
 730	ret = 1;
 731	handle = NULL;
 732out_up_read:
 733	up_read(&EXT4_I(inode)->xattr_sem);
 734out:
 735	if (handle && (ret != 1))
 736		ext4_journal_stop(handle);
 737	brelse(iloc.bh);
 738	return ret;
 739convert:
 740	return ext4_convert_inline_data_to_extent(mapping, inode);
 
 741}
 742
 743int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 744			       unsigned copied, struct folio *folio)
 745{
 746	handle_t *handle = ext4_journal_current_handle();
 747	int no_expand;
 748	void *kaddr;
 749	struct ext4_iloc iloc;
 750	int ret = 0, ret2;
 751
 752	if (unlikely(copied < len) && !folio_test_uptodate(folio))
 753		copied = 0;
 754
 755	if (likely(copied)) {
 756		ret = ext4_get_inode_loc(inode, &iloc);
 757		if (ret) {
 758			folio_unlock(folio);
 759			folio_put(folio);
 760			ext4_std_error(inode->i_sb, ret);
 761			goto out;
 762		}
 763		ext4_write_lock_xattr(inode, &no_expand);
 764		BUG_ON(!ext4_has_inline_data(inode));
 765
 766		/*
 767		 * ei->i_inline_off may have changed since
 768		 * ext4_write_begin() called
 769		 * ext4_try_to_write_inline_data()
 770		 */
 771		(void) ext4_find_inline_data_nolock(inode);
 772
 773		kaddr = kmap_local_folio(folio, 0);
 774		ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 775		kunmap_local(kaddr);
 776		folio_mark_uptodate(folio);
 777		/* clear dirty flag so that writepages wouldn't work for us. */
 778		folio_clear_dirty(folio);
 779
 780		ext4_write_unlock_xattr(inode, &no_expand);
 781		brelse(iloc.bh);
 782
 783		/*
 784		 * It's important to update i_size while still holding folio
 785		 * lock: page writeout could otherwise come in and zero
 786		 * beyond i_size.
 787		 */
 788		ext4_update_inode_size(inode, pos + copied);
 789	}
 790	folio_unlock(folio);
 791	folio_put(folio);
 792
 793	/*
 794	 * Don't mark the inode dirty under folio lock. First, it unnecessarily
 795	 * makes the holding time of folio lock longer. Second, it forces lock
 796	 * ordering of folio lock and transaction start for journaling
 797	 * filesystems.
 798	 */
 799	if (likely(copied))
 800		mark_inode_dirty(inode);
 801out:
 802	/*
 803	 * If we didn't copy as much data as expected, we need to trim back
 804	 * size of xattr containing inline data.
 805	 */
 806	if (pos + len > inode->i_size && ext4_can_truncate(inode))
 807		ext4_orphan_add(handle, inode);
 808
 809	ret2 = ext4_journal_stop(handle);
 810	if (!ret)
 811		ret = ret2;
 812	if (pos + len > inode->i_size) {
 813		ext4_truncate_failed_write(inode);
 814		/*
 815		 * If truncate failed early the inode might still be
 816		 * on the orphan list; we need to make sure the inode
 817		 * is removed from the orphan list in that case.
 818		 */
 819		if (inode->i_nlink)
 820			ext4_orphan_del(NULL, inode);
 
 821	}
 822	return ret ? ret : copied;
 
 
 
 
 
 
 
 823}
 824
 825/*
 826 * Try to make the page cache and handle ready for the inline data case.
 827 * We can call this function in 2 cases:
 828 * 1. The inode is created and the first write exceeds inline size. We can
 829 *    clear the inode state safely.
 830 * 2. The inode has inline data, then we need to read the data, make it
 831 *    update and dirty so that ext4_da_writepages can handle it. We don't
 832 *    need to start the journal since the file's metadata isn't changed now.
 833 */
 834static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 835						 struct inode *inode,
 
 836						 void **fsdata)
 837{
 838	int ret = 0, inline_size;
 839	struct folio *folio;
 840
 841	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 842					mapping_gfp_mask(mapping));
 843	if (IS_ERR(folio))
 844		return PTR_ERR(folio);
 845
 846	down_read(&EXT4_I(inode)->xattr_sem);
 847	if (!ext4_has_inline_data(inode)) {
 848		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 849		goto out;
 850	}
 851
 852	inline_size = ext4_get_inline_size(inode);
 853
 854	if (!folio_test_uptodate(folio)) {
 855		ret = ext4_read_inline_folio(inode, folio);
 856		if (ret < 0)
 857			goto out;
 858	}
 859
 860	ret = ext4_block_write_begin(NULL, folio, 0, inline_size,
 861				     ext4_da_get_block_prep);
 862	if (ret) {
 863		up_read(&EXT4_I(inode)->xattr_sem);
 864		folio_unlock(folio);
 865		folio_put(folio);
 866		ext4_truncate_failed_write(inode);
 867		return ret;
 868	}
 869
 870	folio_mark_dirty(folio);
 871	folio_mark_uptodate(folio);
 872	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 873	*fsdata = (void *)CONVERT_INLINE_DATA;
 874
 875out:
 876	up_read(&EXT4_I(inode)->xattr_sem);
 877	if (folio) {
 878		folio_unlock(folio);
 879		folio_put(folio);
 880	}
 881	return ret;
 882}
 883
 884/*
 885 * Prepare the write for the inline data.
 886 * If the data can be written into the inode, we just read
 887 * the page and make it uptodate, and start the journal.
 888 * Otherwise read the page, makes it dirty so that it can be
 889 * handle in writepages(the i_disksize update is left to the
 890 * normal ext4_da_write_end).
 891 */
 892int ext4_da_write_inline_data_begin(struct address_space *mapping,
 893				    struct inode *inode,
 894				    loff_t pos, unsigned len,
 895				    struct folio **foliop,
 
 896				    void **fsdata)
 897{
 898	int ret;
 899	handle_t *handle;
 900	struct folio *folio;
 901	struct ext4_iloc iloc;
 902	int retries = 0;
 903
 904	ret = ext4_get_inode_loc(inode, &iloc);
 905	if (ret)
 906		return ret;
 907
 908retry_journal:
 909	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 910	if (IS_ERR(handle)) {
 911		ret = PTR_ERR(handle);
 912		goto out;
 913	}
 914
 915	ret = ext4_prepare_inline_data(handle, inode, pos + len);
 916	if (ret && ret != -ENOSPC)
 917		goto out_journal;
 
 
 
 
 
 
 
 
 
 
 
 918
 919	if (ret == -ENOSPC) {
 920		ext4_journal_stop(handle);
 921		ret = ext4_da_convert_inline_data_to_extent(mapping,
 922							    inode,
 
 923							    fsdata);
 
 924		if (ret == -ENOSPC &&
 925		    ext4_should_retry_alloc(inode->i_sb, &retries))
 926			goto retry_journal;
 927		goto out;
 928	}
 929
 930	/*
 931	 * We cannot recurse into the filesystem as the transaction
 932	 * is already started.
 933	 */
 934	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
 935					mapping_gfp_mask(mapping));
 936	if (IS_ERR(folio)) {
 937		ret = PTR_ERR(folio);
 938		goto out_journal;
 939	}
 940
 941	down_read(&EXT4_I(inode)->xattr_sem);
 942	if (!ext4_has_inline_data(inode)) {
 943		ret = 0;
 944		goto out_release_page;
 945	}
 946
 947	if (!folio_test_uptodate(folio)) {
 948		ret = ext4_read_inline_folio(inode, folio);
 949		if (ret < 0)
 950			goto out_release_page;
 951	}
 952	ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 953					    EXT4_JTR_NONE);
 954	if (ret)
 955		goto out_release_page;
 956
 957	up_read(&EXT4_I(inode)->xattr_sem);
 958	*foliop = folio;
 959	brelse(iloc.bh);
 960	return 1;
 961out_release_page:
 962	up_read(&EXT4_I(inode)->xattr_sem);
 963	folio_unlock(folio);
 964	folio_put(folio);
 965out_journal:
 966	ext4_journal_stop(handle);
 967out:
 968	brelse(iloc.bh);
 969	return ret;
 970}
 971
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 972#ifdef INLINE_DIR_DEBUG
 973void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 974			  void *inline_start, int inline_size)
 975{
 976	int offset;
 977	unsigned short de_len;
 978	struct ext4_dir_entry_2 *de = inline_start;
 979	void *dlimit = inline_start + inline_size;
 980
 981	trace_printk("inode %lu\n", dir->i_ino);
 982	offset = 0;
 983	while ((void *)de < dlimit) {
 984		de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 985		trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 986			     offset, de_len, de->name_len, de->name,
 987			     de->name_len, le32_to_cpu(de->inode));
 988		if (ext4_check_dir_entry(dir, NULL, de, bh,
 989					 inline_start, inline_size, offset))
 990			BUG();
 991
 992		offset += de_len;
 993		de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 994	}
 995}
 996#else
 997#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 998#endif
 999
1000/*
1001 * Add a new entry into a inline dir.
1002 * It will return -ENOSPC if no space is available, and -EIO
1003 * and -EEXIST if directory entry already exists.
1004 */
1005static int ext4_add_dirent_to_inline(handle_t *handle,
1006				     struct ext4_filename *fname,
1007				     struct inode *dir,
1008				     struct inode *inode,
1009				     struct ext4_iloc *iloc,
1010				     void *inline_start, int inline_size)
1011{
1012	int		err;
1013	struct ext4_dir_entry_2 *de;
1014
1015	err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1016				inline_size, fname, &de);
1017	if (err)
1018		return err;
1019
1020	BUFFER_TRACE(iloc->bh, "get_write_access");
1021	err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1022					    EXT4_JTR_NONE);
1023	if (err)
1024		return err;
1025	ext4_insert_dentry(dir, inode, de, inline_size, fname);
1026
1027	ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1028
1029	/*
1030	 * XXX shouldn't update any times until successful
1031	 * completion of syscall, but too many callers depend
1032	 * on this.
1033	 *
1034	 * XXX similarly, too many callers depend on
1035	 * ext4_new_inode() setting the times, but error
1036	 * recovery deletes the inode, so the worst that can
1037	 * happen is that the times are slightly out of date
1038	 * and/or different from the directory change time.
1039	 */
1040	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1041	ext4_update_dx_flag(dir);
1042	inode_inc_iversion(dir);
1043	return 1;
1044}
1045
1046static void *ext4_get_inline_xattr_pos(struct inode *inode,
1047				       struct ext4_iloc *iloc)
1048{
1049	struct ext4_xattr_entry *entry;
1050	struct ext4_xattr_ibody_header *header;
1051
1052	BUG_ON(!EXT4_I(inode)->i_inline_off);
1053
1054	header = IHDR(inode, ext4_raw_inode(iloc));
1055	entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1056					    EXT4_I(inode)->i_inline_off);
1057
1058	return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1059}
1060
1061/* Set the final de to cover the whole block. */
1062static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1063{
1064	struct ext4_dir_entry_2 *de, *prev_de;
1065	void *limit;
1066	int de_len;
1067
1068	de = de_buf;
1069	if (old_size) {
1070		limit = de_buf + old_size;
1071		do {
1072			prev_de = de;
1073			de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1074			de_buf += de_len;
1075			de = de_buf;
1076		} while (de_buf < limit);
1077
1078		prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1079							old_size, new_size);
1080	} else {
1081		/* this is just created, so create an empty entry. */
1082		de->inode = 0;
1083		de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1084	}
1085}
1086
1087static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1088				  struct ext4_iloc *iloc)
1089{
1090	int ret;
1091	int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1092	int new_size = get_max_inline_xattr_value_size(dir, iloc);
1093
1094	if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1095		return -ENOSPC;
1096
1097	ret = ext4_update_inline_data(handle, dir,
1098				      new_size + EXT4_MIN_INLINE_DATA_SIZE);
1099	if (ret)
1100		return ret;
1101
1102	ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1103			     EXT4_I(dir)->i_inline_size -
1104						EXT4_MIN_INLINE_DATA_SIZE);
1105	dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1106	return 0;
1107}
1108
1109static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1110				     struct ext4_iloc *iloc,
1111				     void *buf, int inline_size)
1112{
1113	int ret;
1114
1115	ret = ext4_create_inline_data(handle, inode, inline_size);
1116	if (ret) {
1117		ext4_msg(inode->i_sb, KERN_EMERG,
1118			"error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1119			inode->i_ino, ret);
1120		return;
1121	}
1122	ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1123	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1124}
1125
1126static int ext4_finish_convert_inline_dir(handle_t *handle,
1127					  struct inode *inode,
1128					  struct buffer_head *dir_block,
1129					  void *buf,
1130					  int inline_size)
1131{
1132	int err, csum_size = 0, header_size = 0;
1133	struct ext4_dir_entry_2 *de;
 
1134	void *target = dir_block->b_data;
1135
1136	/*
1137	 * First create "." and ".." and then copy the dir information
1138	 * back to the block.
1139	 */
1140	de = target;
1141	de = ext4_init_dot_dotdot(inode, de,
1142		inode->i_sb->s_blocksize, csum_size,
1143		le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1144	header_size = (void *)de - target;
1145
1146	memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1147		inline_size - EXT4_INLINE_DOTDOT_SIZE);
1148
1149	if (ext4_has_metadata_csum(inode->i_sb))
1150		csum_size = sizeof(struct ext4_dir_entry_tail);
1151
1152	inode->i_size = inode->i_sb->s_blocksize;
1153	i_size_write(inode, inode->i_sb->s_blocksize);
1154	EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1155	ext4_update_final_de(dir_block->b_data,
1156			inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1157			inode->i_sb->s_blocksize - csum_size);
1158
1159	if (csum_size)
1160		ext4_initialize_dirent_tail(dir_block,
1161					    inode->i_sb->s_blocksize);
 
 
1162	set_buffer_uptodate(dir_block);
1163	unlock_buffer(dir_block);
1164	err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1165	if (err)
1166		return err;
1167	set_buffer_verified(dir_block);
1168	return ext4_mark_inode_dirty(handle, inode);
1169}
1170
1171static int ext4_convert_inline_data_nolock(handle_t *handle,
1172					   struct inode *inode,
1173					   struct ext4_iloc *iloc)
1174{
1175	int error;
1176	void *buf = NULL;
1177	struct buffer_head *data_bh = NULL;
1178	struct ext4_map_blocks map;
1179	int inline_size;
1180
1181	inline_size = ext4_get_inline_size(inode);
1182	buf = kmalloc(inline_size, GFP_NOFS);
1183	if (!buf) {
1184		error = -ENOMEM;
1185		goto out;
1186	}
1187
1188	error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1189	if (error < 0)
1190		goto out;
1191
1192	/*
1193	 * Make sure the inline directory entries pass checks before we try to
1194	 * convert them, so that we avoid touching stuff that needs fsck.
1195	 */
1196	if (S_ISDIR(inode->i_mode)) {
1197		error = ext4_check_all_de(inode, iloc->bh,
1198					buf + EXT4_INLINE_DOTDOT_SIZE,
1199					inline_size - EXT4_INLINE_DOTDOT_SIZE);
1200		if (error)
1201			goto out;
1202	}
1203
1204	error = ext4_destroy_inline_data_nolock(handle, inode);
1205	if (error)
1206		goto out;
1207
1208	map.m_lblk = 0;
1209	map.m_len = 1;
1210	map.m_flags = 0;
1211	error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1212	if (error < 0)
1213		goto out_restore;
1214	if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1215		error = -EIO;
1216		goto out_restore;
1217	}
1218
1219	data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1220	if (!data_bh) {
1221		error = -ENOMEM;
1222		goto out_restore;
1223	}
1224
1225	lock_buffer(data_bh);
1226	error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1227					       EXT4_JTR_NONE);
1228	if (error) {
1229		unlock_buffer(data_bh);
1230		error = -EIO;
1231		goto out_restore;
1232	}
1233	memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1234
1235	if (!S_ISDIR(inode->i_mode)) {
1236		memcpy(data_bh->b_data, buf, inline_size);
1237		set_buffer_uptodate(data_bh);
1238		unlock_buffer(data_bh);
1239		error = ext4_handle_dirty_metadata(handle,
1240						   inode, data_bh);
1241	} else {
1242		error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1243						       buf, inline_size);
1244	}
1245
 
1246out_restore:
1247	if (error)
1248		ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1249
1250out:
1251	brelse(data_bh);
1252	kfree(buf);
1253	return error;
1254}
1255
1256/*
1257 * Try to add the new entry to the inline data.
1258 * If succeeds, return 0. If not, extended the inline dir and copied data to
1259 * the new created block.
1260 */
1261int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1262			      struct inode *dir, struct inode *inode)
1263{
1264	int ret, ret2, inline_size, no_expand;
1265	void *inline_start;
1266	struct ext4_iloc iloc;
1267
1268	ret = ext4_get_inode_loc(dir, &iloc);
1269	if (ret)
1270		return ret;
1271
1272	ext4_write_lock_xattr(dir, &no_expand);
1273	if (!ext4_has_inline_data(dir))
1274		goto out;
1275
1276	inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1277						 EXT4_INLINE_DOTDOT_SIZE;
1278	inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1279
1280	ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1281					inline_start, inline_size);
1282	if (ret != -ENOSPC)
1283		goto out;
1284
1285	/* check whether it can be inserted to inline xattr space. */
1286	inline_size = EXT4_I(dir)->i_inline_size -
1287			EXT4_MIN_INLINE_DATA_SIZE;
1288	if (!inline_size) {
1289		/* Try to use the xattr space.*/
1290		ret = ext4_update_inline_dir(handle, dir, &iloc);
1291		if (ret && ret != -ENOSPC)
1292			goto out;
1293
1294		inline_size = EXT4_I(dir)->i_inline_size -
1295				EXT4_MIN_INLINE_DATA_SIZE;
1296	}
1297
1298	if (inline_size) {
1299		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1300
1301		ret = ext4_add_dirent_to_inline(handle, fname, dir,
1302						inode, &iloc, inline_start,
1303						inline_size);
1304
1305		if (ret != -ENOSPC)
1306			goto out;
1307	}
1308
1309	/*
1310	 * The inline space is filled up, so create a new block for it.
1311	 * As the extent tree will be created, we have to save the inline
1312	 * dir first.
1313	 */
1314	ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1315
1316out:
1317	ext4_write_unlock_xattr(dir, &no_expand);
1318	ret2 = ext4_mark_inode_dirty(handle, dir);
1319	if (unlikely(ret2 && !ret))
1320		ret = ret2;
1321	brelse(iloc.bh);
1322	return ret;
1323}
1324
1325/*
1326 * This function fills a red-black tree with information from an
1327 * inlined dir.  It returns the number directory entries loaded
1328 * into the tree.  If there is an error it is returned in err.
1329 */
1330int ext4_inlinedir_to_tree(struct file *dir_file,
1331			   struct inode *dir, ext4_lblk_t block,
1332			   struct dx_hash_info *hinfo,
1333			   __u32 start_hash, __u32 start_minor_hash,
1334			   int *has_inline_data)
1335{
1336	int err = 0, count = 0;
1337	unsigned int parent_ino;
1338	int pos;
1339	struct ext4_dir_entry_2 *de;
1340	struct inode *inode = file_inode(dir_file);
1341	int ret, inline_size = 0;
1342	struct ext4_iloc iloc;
1343	void *dir_buf = NULL;
1344	struct ext4_dir_entry_2 fake;
1345	struct fscrypt_str tmp_str;
1346
1347	ret = ext4_get_inode_loc(inode, &iloc);
1348	if (ret)
1349		return ret;
1350
1351	down_read(&EXT4_I(inode)->xattr_sem);
1352	if (!ext4_has_inline_data(inode)) {
1353		up_read(&EXT4_I(inode)->xattr_sem);
1354		*has_inline_data = 0;
1355		goto out;
1356	}
1357
1358	inline_size = ext4_get_inline_size(inode);
1359	dir_buf = kmalloc(inline_size, GFP_NOFS);
1360	if (!dir_buf) {
1361		ret = -ENOMEM;
1362		up_read(&EXT4_I(inode)->xattr_sem);
1363		goto out;
1364	}
1365
1366	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1367	up_read(&EXT4_I(inode)->xattr_sem);
1368	if (ret < 0)
1369		goto out;
1370
1371	pos = 0;
1372	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1373	while (pos < inline_size) {
1374		/*
1375		 * As inlined dir doesn't store any information about '.' and
1376		 * only the inode number of '..' is stored, we have to handle
1377		 * them differently.
1378		 */
1379		if (pos == 0) {
1380			fake.inode = cpu_to_le32(inode->i_ino);
1381			fake.name_len = 1;
1382			strcpy(fake.name, ".");
1383			fake.rec_len = ext4_rec_len_to_disk(
1384					  ext4_dir_rec_len(fake.name_len, NULL),
1385					  inline_size);
1386			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1387			de = &fake;
1388			pos = EXT4_INLINE_DOTDOT_OFFSET;
1389		} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1390			fake.inode = cpu_to_le32(parent_ino);
1391			fake.name_len = 2;
1392			strcpy(fake.name, "..");
1393			fake.rec_len = ext4_rec_len_to_disk(
1394					  ext4_dir_rec_len(fake.name_len, NULL),
1395					  inline_size);
1396			ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1397			de = &fake;
1398			pos = EXT4_INLINE_DOTDOT_SIZE;
1399		} else {
1400			de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1401			pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1402			if (ext4_check_dir_entry(inode, dir_file, de,
1403					 iloc.bh, dir_buf,
1404					 inline_size, pos)) {
1405				ret = count;
1406				goto out;
1407			}
1408		}
1409
1410		if (ext4_hash_in_dirent(dir)) {
1411			hinfo->hash = EXT4_DIRENT_HASH(de);
1412			hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1413		} else {
1414			err = ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1415			if (err) {
1416				ret = err;
1417				goto out;
1418			}
1419		}
1420		if ((hinfo->hash < start_hash) ||
1421		    ((hinfo->hash == start_hash) &&
1422		     (hinfo->minor_hash < start_minor_hash)))
1423			continue;
1424		if (de->inode == 0)
1425			continue;
1426		tmp_str.name = de->name;
1427		tmp_str.len = de->name_len;
1428		err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1429					      hinfo->minor_hash, de, &tmp_str);
1430		if (err) {
1431			ret = err;
1432			goto out;
1433		}
1434		count++;
1435	}
1436	ret = count;
1437out:
1438	kfree(dir_buf);
1439	brelse(iloc.bh);
1440	return ret;
1441}
1442
1443/*
1444 * So this function is called when the volume is mkfsed with
1445 * dir_index disabled. In order to keep f_pos persistent
1446 * after we convert from an inlined dir to a blocked based,
1447 * we just pretend that we are a normal dir and return the
1448 * offset as if '.' and '..' really take place.
1449 *
1450 */
1451int ext4_read_inline_dir(struct file *file,
1452			 struct dir_context *ctx,
1453			 int *has_inline_data)
1454{
1455	unsigned int offset, parent_ino;
1456	int i;
1457	struct ext4_dir_entry_2 *de;
1458	struct super_block *sb;
1459	struct inode *inode = file_inode(file);
1460	int ret, inline_size = 0;
1461	struct ext4_iloc iloc;
1462	void *dir_buf = NULL;
1463	int dotdot_offset, dotdot_size, extra_offset, extra_size;
1464	struct dir_private_info *info = file->private_data;
1465
1466	ret = ext4_get_inode_loc(inode, &iloc);
1467	if (ret)
1468		return ret;
1469
1470	down_read(&EXT4_I(inode)->xattr_sem);
1471	if (!ext4_has_inline_data(inode)) {
1472		up_read(&EXT4_I(inode)->xattr_sem);
1473		*has_inline_data = 0;
1474		goto out;
1475	}
1476
1477	inline_size = ext4_get_inline_size(inode);
1478	dir_buf = kmalloc(inline_size, GFP_NOFS);
1479	if (!dir_buf) {
1480		ret = -ENOMEM;
1481		up_read(&EXT4_I(inode)->xattr_sem);
1482		goto out;
1483	}
1484
1485	ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1486	up_read(&EXT4_I(inode)->xattr_sem);
1487	if (ret < 0)
1488		goto out;
1489
1490	ret = 0;
1491	sb = inode->i_sb;
1492	parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1493	offset = ctx->pos;
1494
1495	/*
1496	 * dotdot_offset and dotdot_size is the real offset and
1497	 * size for ".." and "." if the dir is block based while
1498	 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1499	 * So we will use extra_offset and extra_size to indicate them
1500	 * during the inline dir iteration.
1501	 */
1502	dotdot_offset = ext4_dir_rec_len(1, NULL);
1503	dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1504	extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1505	extra_size = extra_offset + inline_size;
1506
1507	/*
1508	 * If the cookie has changed since the last call to
1509	 * readdir(2), then we might be pointing to an invalid
1510	 * dirent right now.  Scan from the start of the inline
1511	 * dir to make sure.
1512	 */
1513	if (!inode_eq_iversion(inode, info->cookie)) {
1514		for (i = 0; i < extra_size && i < offset;) {
1515			/*
1516			 * "." is with offset 0 and
1517			 * ".." is dotdot_offset.
1518			 */
1519			if (!i) {
1520				i = dotdot_offset;
1521				continue;
1522			} else if (i == dotdot_offset) {
1523				i = dotdot_size;
1524				continue;
1525			}
1526			/* for other entry, the real offset in
1527			 * the buf has to be tuned accordingly.
1528			 */
1529			de = (struct ext4_dir_entry_2 *)
1530				(dir_buf + i - extra_offset);
1531			/* It's too expensive to do a full
1532			 * dirent test each time round this
1533			 * loop, but we do have to test at
1534			 * least that it is non-zero.  A
1535			 * failure will be detected in the
1536			 * dirent test below. */
1537			if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1538				< ext4_dir_rec_len(1, NULL))
1539				break;
1540			i += ext4_rec_len_from_disk(de->rec_len,
1541						    extra_size);
1542		}
1543		offset = i;
1544		ctx->pos = offset;
1545		info->cookie = inode_query_iversion(inode);
1546	}
1547
1548	while (ctx->pos < extra_size) {
1549		if (ctx->pos == 0) {
1550			if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1551				goto out;
1552			ctx->pos = dotdot_offset;
1553			continue;
1554		}
1555
1556		if (ctx->pos == dotdot_offset) {
1557			if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1558				goto out;
1559			ctx->pos = dotdot_size;
1560			continue;
1561		}
1562
1563		de = (struct ext4_dir_entry_2 *)
1564			(dir_buf + ctx->pos - extra_offset);
1565		if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1566					 extra_size, ctx->pos))
1567			goto out;
1568		if (le32_to_cpu(de->inode)) {
1569			if (!dir_emit(ctx, de->name, de->name_len,
1570				      le32_to_cpu(de->inode),
1571				      get_dtype(sb, de->file_type)))
1572				goto out;
1573		}
1574		ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1575	}
1576out:
1577	kfree(dir_buf);
1578	brelse(iloc.bh);
1579	return ret;
1580}
1581
1582void *ext4_read_inline_link(struct inode *inode)
1583{
1584	struct ext4_iloc iloc;
1585	int ret, inline_size;
1586	void *link;
1587
1588	ret = ext4_get_inode_loc(inode, &iloc);
1589	if (ret)
1590		return ERR_PTR(ret);
1591
1592	ret = -ENOMEM;
1593	inline_size = ext4_get_inline_size(inode);
1594	link = kmalloc(inline_size + 1, GFP_NOFS);
1595	if (!link)
1596		goto out;
1597
1598	ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1599	if (ret < 0) {
1600		kfree(link);
1601		goto out;
1602	}
1603	nd_terminate_link(link, inode->i_size, ret);
1604out:
1605	if (ret < 0)
1606		link = ERR_PTR(ret);
1607	brelse(iloc.bh);
1608	return link;
1609}
1610
1611struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1612					struct ext4_dir_entry_2 **parent_de,
1613					int *retval)
1614{
1615	struct ext4_iloc iloc;
1616
1617	*retval = ext4_get_inode_loc(inode, &iloc);
1618	if (*retval)
1619		return NULL;
1620
1621	*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1622
1623	return iloc.bh;
1624}
1625
1626/*
1627 * Try to create the inline data for the new dir.
1628 * If it succeeds, return 0, otherwise return the error.
1629 * In case of ENOSPC, the caller should create the normal disk layout dir.
1630 */
1631int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1632			       struct inode *inode)
1633{
1634	int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1635	struct ext4_iloc iloc;
1636	struct ext4_dir_entry_2 *de;
1637
1638	ret = ext4_get_inode_loc(inode, &iloc);
1639	if (ret)
1640		return ret;
1641
1642	ret = ext4_prepare_inline_data(handle, inode, inline_size);
1643	if (ret)
1644		goto out;
1645
1646	/*
1647	 * For inline dir, we only save the inode information for the ".."
1648	 * and create a fake dentry to cover the left space.
1649	 */
1650	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1651	de->inode = cpu_to_le32(parent->i_ino);
1652	de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1653	de->inode = 0;
1654	de->rec_len = ext4_rec_len_to_disk(
1655				inline_size - EXT4_INLINE_DOTDOT_SIZE,
1656				inline_size);
1657	set_nlink(inode, 2);
1658	inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1659out:
1660	brelse(iloc.bh);
1661	return ret;
1662}
1663
1664struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1665					struct ext4_filename *fname,
1666					struct ext4_dir_entry_2 **res_dir,
1667					int *has_inline_data)
1668{
1669	struct ext4_xattr_ibody_find is = {
1670		.s = { .not_found = -ENODATA, },
1671	};
1672	struct ext4_xattr_info i = {
1673		.name_index = EXT4_XATTR_INDEX_SYSTEM,
1674		.name = EXT4_XATTR_SYSTEM_DATA,
1675	};
1676	int ret;
 
1677	void *inline_start;
1678	int inline_size;
1679
1680	ret = ext4_get_inode_loc(dir, &is.iloc);
1681	if (ret)
1682		return ERR_PTR(ret);
1683
1684	down_read(&EXT4_I(dir)->xattr_sem);
1685
1686	ret = ext4_xattr_ibody_find(dir, &i, &is);
1687	if (ret)
1688		goto out;
1689
1690	if (!ext4_has_inline_data(dir)) {
1691		*has_inline_data = 0;
1692		goto out;
1693	}
1694
1695	inline_start = (void *)ext4_raw_inode(&is.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(is.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, &is.iloc);
1709	inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1710
1711	ret = ext4_search_dir(is.iloc.bh, inline_start, inline_size,
1712			      dir, fname, 0, res_dir);
1713	if (ret == 1)
1714		goto out_find;
1715
1716out:
1717	brelse(is.iloc.bh);
1718	if (ret < 0)
1719		is.iloc.bh = ERR_PTR(ret);
1720	else
1721		is.iloc.bh = NULL;
1722out_find:
1723	up_read(&EXT4_I(dir)->xattr_sem);
1724	return is.iloc.bh;
1725}
1726
1727int ext4_delete_inline_entry(handle_t *handle,
1728			     struct inode *dir,
1729			     struct ext4_dir_entry_2 *de_del,
1730			     struct buffer_head *bh,
1731			     int *has_inline_data)
1732{
1733	int err, inline_size, no_expand;
1734	struct ext4_iloc iloc;
1735	void *inline_start;
1736
1737	err = ext4_get_inode_loc(dir, &iloc);
1738	if (err)
1739		return err;
1740
1741	ext4_write_lock_xattr(dir, &no_expand);
1742	if (!ext4_has_inline_data(dir)) {
1743		*has_inline_data = 0;
1744		goto out;
1745	}
1746
1747	if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1748		EXT4_MIN_INLINE_DATA_SIZE) {
1749		inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1750					EXT4_INLINE_DOTDOT_SIZE;
1751		inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1752				EXT4_INLINE_DOTDOT_SIZE;
1753	} else {
1754		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1755		inline_size = ext4_get_inline_size(dir) -
1756				EXT4_MIN_INLINE_DATA_SIZE;
1757	}
1758
1759	BUFFER_TRACE(bh, "get_write_access");
1760	err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1761					    EXT4_JTR_NONE);
1762	if (err)
1763		goto out;
1764
1765	err = ext4_generic_delete_entry(dir, de_del, bh,
1766					inline_start, inline_size, 0);
1767	if (err)
1768		goto out;
1769
1770	ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1771out:
1772	ext4_write_unlock_xattr(dir, &no_expand);
1773	if (likely(err == 0))
1774		err = ext4_mark_inode_dirty(handle, dir);
1775	brelse(iloc.bh);
1776	if (err != -ENOENT)
1777		ext4_std_error(dir->i_sb, err);
1778	return err;
1779}
1780
1781/*
1782 * Get the inline dentry at offset.
1783 */
1784static inline struct ext4_dir_entry_2 *
1785ext4_get_inline_entry(struct inode *inode,
1786		      struct ext4_iloc *iloc,
1787		      unsigned int offset,
1788		      void **inline_start,
1789		      int *inline_size)
1790{
1791	void *inline_pos;
1792
1793	BUG_ON(offset > ext4_get_inline_size(inode));
1794
1795	if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1796		inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1797		*inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1798	} else {
1799		inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1800		offset -= EXT4_MIN_INLINE_DATA_SIZE;
1801		*inline_size = ext4_get_inline_size(inode) -
1802				EXT4_MIN_INLINE_DATA_SIZE;
1803	}
1804
1805	if (inline_start)
1806		*inline_start = inline_pos;
1807	return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1808}
1809
1810bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1811{
1812	int err, inline_size;
1813	struct ext4_iloc iloc;
1814	size_t inline_len;
1815	void *inline_pos;
1816	unsigned int offset;
1817	struct ext4_dir_entry_2 *de;
1818	bool ret = false;
1819
1820	err = ext4_get_inode_loc(dir, &iloc);
1821	if (err) {
1822		EXT4_ERROR_INODE_ERR(dir, -err,
1823				     "error %d getting inode %lu block",
1824				     err, dir->i_ino);
1825		return false;
1826	}
1827
1828	down_read(&EXT4_I(dir)->xattr_sem);
1829	if (!ext4_has_inline_data(dir)) {
1830		*has_inline_data = 0;
1831		ret = true;
1832		goto out;
1833	}
1834
1835	de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1836	if (!le32_to_cpu(de->inode)) {
1837		ext4_warning(dir->i_sb,
1838			     "bad inline directory (dir #%lu) - no `..'",
1839			     dir->i_ino);
 
1840		goto out;
1841	}
1842
1843	inline_len = ext4_get_inline_size(dir);
1844	offset = EXT4_INLINE_DOTDOT_SIZE;
1845	while (offset < inline_len) {
1846		de = ext4_get_inline_entry(dir, &iloc, offset,
1847					   &inline_pos, &inline_size);
1848		if (ext4_check_dir_entry(dir, NULL, de,
1849					 iloc.bh, inline_pos,
1850					 inline_size, offset)) {
1851			ext4_warning(dir->i_sb,
1852				     "bad inline directory (dir #%lu) - "
1853				     "inode %u, rec_len %u, name_len %d"
1854				     "inline size %d",
1855				     dir->i_ino, le32_to_cpu(de->inode),
1856				     le16_to_cpu(de->rec_len), de->name_len,
1857				     inline_size);
 
1858			goto out;
1859		}
1860		if (le32_to_cpu(de->inode)) {
 
1861			goto out;
1862		}
1863		offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1864	}
1865
1866	ret = true;
1867out:
1868	up_read(&EXT4_I(dir)->xattr_sem);
1869	brelse(iloc.bh);
1870	return ret;
1871}
1872
1873int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1874{
1875	int ret, no_expand;
1876
1877	ext4_write_lock_xattr(inode, &no_expand);
1878	ret = ext4_destroy_inline_data_nolock(handle, inode);
1879	ext4_write_unlock_xattr(inode, &no_expand);
1880
1881	return ret;
1882}
1883
1884int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1885{
1886	__u64 addr;
1887	int error = -EAGAIN;
1888	struct ext4_iloc iloc;
1889
1890	down_read(&EXT4_I(inode)->xattr_sem);
1891	if (!ext4_has_inline_data(inode))
1892		goto out;
1893
1894	error = ext4_get_inode_loc(inode, &iloc);
1895	if (error)
1896		goto out;
1897
1898	addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1899	addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1900	addr += offsetof(struct ext4_inode, i_block);
1901
1902	brelse(iloc.bh);
1903
1904	iomap->addr = addr;
1905	iomap->offset = 0;
1906	iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1907			      i_size_read(inode));
1908	iomap->type = IOMAP_INLINE;
1909	iomap->flags = 0;
1910
1911out:
1912	up_read(&EXT4_I(inode)->xattr_sem);
1913	return error;
1914}
1915
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1916int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1917{
1918	handle_t *handle;
1919	int inline_size, value_len, needed_blocks, no_expand, err = 0;
1920	size_t i_size;
1921	void *value = NULL;
1922	struct ext4_xattr_ibody_find is = {
1923		.s = { .not_found = -ENODATA, },
1924	};
1925	struct ext4_xattr_info i = {
1926		.name_index = EXT4_XATTR_INDEX_SYSTEM,
1927		.name = EXT4_XATTR_SYSTEM_DATA,
1928	};
1929
1930
1931	needed_blocks = ext4_writepage_trans_blocks(inode);
1932	handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1933	if (IS_ERR(handle))
1934		return PTR_ERR(handle);
1935
1936	ext4_write_lock_xattr(inode, &no_expand);
1937	if (!ext4_has_inline_data(inode)) {
1938		ext4_write_unlock_xattr(inode, &no_expand);
1939		*has_inline = 0;
1940		ext4_journal_stop(handle);
1941		return 0;
1942	}
1943
1944	if ((err = ext4_orphan_add(handle, inode)) != 0)
1945		goto out;
1946
1947	if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1948		goto out;
1949
1950	down_write(&EXT4_I(inode)->i_data_sem);
1951	i_size = inode->i_size;
1952	inline_size = ext4_get_inline_size(inode);
1953	EXT4_I(inode)->i_disksize = i_size;
1954
1955	if (i_size < inline_size) {
1956		/*
1957		 * if there's inline data to truncate and this file was
1958		 * converted to extents after that inline data was written,
1959		 * the extent status cache must be cleared to avoid leaving
1960		 * behind stale delayed allocated extent entries
1961		 */
1962		if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
1963			ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1964
1965		/* Clear the content in the xattr space. */
1966		if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1967			if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1968				goto out_error;
1969
1970			BUG_ON(is.s.not_found);
1971
1972			value_len = le32_to_cpu(is.s.here->e_value_size);
1973			value = kmalloc(value_len, GFP_NOFS);
1974			if (!value) {
1975				err = -ENOMEM;
1976				goto out_error;
1977			}
1978
1979			err = ext4_xattr_ibody_get(inode, i.name_index,
1980						   i.name, value, value_len);
1981			if (err <= 0)
1982				goto out_error;
1983
1984			i.value = value;
1985			i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1986					i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1987			err = ext4_xattr_ibody_set(handle, inode, &i, &is);
 
1988			if (err)
1989				goto out_error;
1990		}
1991
1992		/* Clear the content within i_blocks. */
1993		if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1994			void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1995			memset(p + i_size, 0,
1996			       EXT4_MIN_INLINE_DATA_SIZE - i_size);
1997		}
1998
1999		EXT4_I(inode)->i_inline_size = i_size <
2000					EXT4_MIN_INLINE_DATA_SIZE ?
2001					EXT4_MIN_INLINE_DATA_SIZE : i_size;
2002	}
2003
2004out_error:
2005	up_write(&EXT4_I(inode)->i_data_sem);
2006out:
2007	brelse(is.iloc.bh);
2008	ext4_write_unlock_xattr(inode, &no_expand);
2009	kfree(value);
2010	if (inode->i_nlink)
2011		ext4_orphan_del(handle, inode);
2012
2013	if (err == 0) {
2014		inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
2015		err = ext4_mark_inode_dirty(handle, inode);
2016		if (IS_SYNC(inode))
2017			ext4_handle_sync(handle);
2018	}
2019	ext4_journal_stop(handle);
2020	return err;
2021}
2022
2023int ext4_convert_inline_data(struct inode *inode)
2024{
2025	int error, needed_blocks, no_expand;
2026	handle_t *handle;
2027	struct ext4_iloc iloc;
2028
2029	if (!ext4_has_inline_data(inode)) {
2030		ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2031		return 0;
2032	} else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2033		/*
2034		 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2035		 * cleared. This means we are in the middle of moving of
2036		 * inline data to delay allocated block. Just force writeout
2037		 * here to finish conversion.
2038		 */
2039		error = filemap_flush(inode->i_mapping);
2040		if (error)
2041			return error;
2042		if (!ext4_has_inline_data(inode))
2043			return 0;
2044	}
2045
2046	needed_blocks = ext4_writepage_trans_blocks(inode);
2047
2048	iloc.bh = NULL;
2049	error = ext4_get_inode_loc(inode, &iloc);
2050	if (error)
2051		return error;
2052
2053	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2054	if (IS_ERR(handle)) {
2055		error = PTR_ERR(handle);
2056		goto out_free;
2057	}
2058
2059	ext4_write_lock_xattr(inode, &no_expand);
2060	if (ext4_has_inline_data(inode))
2061		error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2062	ext4_write_unlock_xattr(inode, &no_expand);
2063	ext4_journal_stop(handle);
2064out_free:
2065	brelse(iloc.bh);
2066	return error;
2067}