linux/fs/ext4/inline.c
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   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/iversion.h>
  10
  11#include "ext4_jbd2.h"
  12#include "ext4.h"
  13#include "xattr.h"
  14#include "truncate.h"
  15
  16#define EXT4_XATTR_SYSTEM_DATA  "data"
  17#define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  18#define EXT4_INLINE_DOTDOT_OFFSET       2
  19#define EXT4_INLINE_DOTDOT_SIZE         4
  20
  21static int ext4_get_inline_size(struct inode *inode)
  22{
  23        if (EXT4_I(inode)->i_inline_off)
  24                return EXT4_I(inode)->i_inline_size;
  25
  26        return 0;
  27}
  28
  29static int get_max_inline_xattr_value_size(struct inode *inode,
  30                                           struct ext4_iloc *iloc)
  31{
  32        struct ext4_xattr_ibody_header *header;
  33        struct ext4_xattr_entry *entry;
  34        struct ext4_inode *raw_inode;
  35        int free, min_offs;
  36
  37        min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  38                        EXT4_GOOD_OLD_INODE_SIZE -
  39                        EXT4_I(inode)->i_extra_isize -
  40                        sizeof(struct ext4_xattr_ibody_header);
  41
  42        /*
  43         * We need to subtract another sizeof(__u32) since an in-inode xattr
  44         * needs an empty 4 bytes to indicate the gap between the xattr entry
  45         * and the name/value pair.
  46         */
  47        if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  48                return EXT4_XATTR_SIZE(min_offs -
  49                        EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  50                        EXT4_XATTR_ROUND - sizeof(__u32));
  51
  52        raw_inode = ext4_raw_inode(iloc);
  53        header = IHDR(inode, raw_inode);
  54        entry = IFIRST(header);
  55
  56        /* Compute min_offs. */
  57        for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  58                if (!entry->e_value_inum && entry->e_value_size) {
  59                        size_t offs = le16_to_cpu(entry->e_value_offs);
  60                        if (offs < min_offs)
  61                                min_offs = offs;
  62                }
  63        }
  64        free = min_offs -
  65                ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  66
  67        if (EXT4_I(inode)->i_inline_off) {
  68                entry = (struct ext4_xattr_entry *)
  69                        ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  70
  71                free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  72                goto out;
  73        }
  74
  75        free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  76
  77        if (free > EXT4_XATTR_ROUND)
  78                free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  79        else
  80                free = 0;
  81
  82out:
  83        return free;
  84}
  85
  86/*
  87 * Get the maximum size we now can store in an inode.
  88 * If we can't find the space for a xattr entry, don't use the space
  89 * of the extents since we have no space to indicate the inline data.
  90 */
  91int ext4_get_max_inline_size(struct inode *inode)
  92{
  93        int error, max_inline_size;
  94        struct ext4_iloc iloc;
  95
  96        if (EXT4_I(inode)->i_extra_isize == 0)
  97                return 0;
  98
  99        error = ext4_get_inode_loc(inode, &iloc);
 100        if (error) {
 101                ext4_error_inode(inode, __func__, __LINE__, 0,
 102                                 "can't get inode location %lu",
 103                                 inode->i_ino);
 104                return 0;
 105        }
 106
 107        down_read(&EXT4_I(inode)->xattr_sem);
 108        max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 109        up_read(&EXT4_I(inode)->xattr_sem);
 110
 111        brelse(iloc.bh);
 112
 113        if (!max_inline_size)
 114                return 0;
 115
 116        return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 117}
 118
 119/*
 120 * this function does not take xattr_sem, which is OK because it is
 121 * currently only used in a code path coming form ext4_iget, before
 122 * the new inode has been unlocked
 123 */
 124int ext4_find_inline_data_nolock(struct inode *inode)
 125{
 126        struct ext4_xattr_ibody_find is = {
 127                .s = { .not_found = -ENODATA, },
 128        };
 129        struct ext4_xattr_info i = {
 130                .name_index = EXT4_XATTR_INDEX_SYSTEM,
 131                .name = EXT4_XATTR_SYSTEM_DATA,
 132        };
 133        int error;
 134
 135        if (EXT4_I(inode)->i_extra_isize == 0)
 136                return 0;
 137
 138        error = ext4_get_inode_loc(inode, &is.iloc);
 139        if (error)
 140                return error;
 141
 142        error = ext4_xattr_ibody_find(inode, &i, &is);
 143        if (error)
 144                goto out;
 145
 146        if (!is.s.not_found) {
 147                if (is.s.here->e_value_inum) {
 148                        EXT4_ERROR_INODE(inode, "inline data xattr refers "
 149                                         "to an external xattr inode");
 150                        error = -EFSCORRUPTED;
 151                        goto out;
 152                }
 153                EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 154                                        (void *)ext4_raw_inode(&is.iloc));
 155                EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 156                                le32_to_cpu(is.s.here->e_value_size);
 157                ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 158        }
 159out:
 160        brelse(is.iloc.bh);
 161        return error;
 162}
 163
 164static int ext4_read_inline_data(struct inode *inode, void *buffer,
 165                                 unsigned int len,
 166                                 struct ext4_iloc *iloc)
 167{
 168        struct ext4_xattr_entry *entry;
 169        struct ext4_xattr_ibody_header *header;
 170        int cp_len = 0;
 171        struct ext4_inode *raw_inode;
 172
 173        if (!len)
 174                return 0;
 175
 176        BUG_ON(len > EXT4_I(inode)->i_inline_size);
 177
 178        cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 179                        len : EXT4_MIN_INLINE_DATA_SIZE;
 180
 181        raw_inode = ext4_raw_inode(iloc);
 182        memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 183
 184        len -= cp_len;
 185        buffer += cp_len;
 186
 187        if (!len)
 188                goto out;
 189
 190        header = IHDR(inode, raw_inode);
 191        entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 192                                            EXT4_I(inode)->i_inline_off);
 193        len = min_t(unsigned int, len,
 194                    (unsigned int)le32_to_cpu(entry->e_value_size));
 195
 196        memcpy(buffer,
 197               (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 198        cp_len += len;
 199
 200out:
 201        return cp_len;
 202}
 203
 204/*
 205 * write the buffer to the inline inode.
 206 * If 'create' is set, we don't need to do the extra copy in the xattr
 207 * value since it is already handled by ext4_xattr_ibody_inline_set.
 208 * That saves us one memcpy.
 209 */
 210static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 211                                   void *buffer, loff_t pos, unsigned int len)
 212{
 213        struct ext4_xattr_entry *entry;
 214        struct ext4_xattr_ibody_header *header;
 215        struct ext4_inode *raw_inode;
 216        int cp_len = 0;
 217
 218        if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 219                return;
 220
 221        BUG_ON(!EXT4_I(inode)->i_inline_off);
 222        BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 223
 224        raw_inode = ext4_raw_inode(iloc);
 225        buffer += pos;
 226
 227        if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 228                cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 229                         EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 230                memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 231
 232                len -= cp_len;
 233                buffer += cp_len;
 234                pos += cp_len;
 235        }
 236
 237        if (!len)
 238                return;
 239
 240        pos -= EXT4_MIN_INLINE_DATA_SIZE;
 241        header = IHDR(inode, raw_inode);
 242        entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 243                                            EXT4_I(inode)->i_inline_off);
 244
 245        memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 246               buffer, len);
 247}
 248
 249static int ext4_create_inline_data(handle_t *handle,
 250                                   struct inode *inode, unsigned len)
 251{
 252        int error;
 253        void *value = NULL;
 254        struct ext4_xattr_ibody_find is = {
 255                .s = { .not_found = -ENODATA, },
 256        };
 257        struct ext4_xattr_info i = {
 258                .name_index = EXT4_XATTR_INDEX_SYSTEM,
 259                .name = EXT4_XATTR_SYSTEM_DATA,
 260        };
 261
 262        error = ext4_get_inode_loc(inode, &is.iloc);
 263        if (error)
 264                return error;
 265
 266        BUFFER_TRACE(is.iloc.bh, "get_write_access");
 267        error = ext4_journal_get_write_access(handle, is.iloc.bh);
 268        if (error)
 269                goto out;
 270
 271        if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 272                value = EXT4_ZERO_XATTR_VALUE;
 273                len -= EXT4_MIN_INLINE_DATA_SIZE;
 274        } else {
 275                value = "";
 276                len = 0;
 277        }
 278
 279        /* Insert the the xttr entry. */
 280        i.value = value;
 281        i.value_len = len;
 282
 283        error = ext4_xattr_ibody_find(inode, &i, &is);
 284        if (error)
 285                goto out;
 286
 287        BUG_ON(!is.s.not_found);
 288
 289        error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 290        if (error) {
 291                if (error == -ENOSPC)
 292                        ext4_clear_inode_state(inode,
 293                                               EXT4_STATE_MAY_INLINE_DATA);
 294                goto out;
 295        }
 296
 297        memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 298                0, EXT4_MIN_INLINE_DATA_SIZE);
 299
 300        EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 301                                      (void *)ext4_raw_inode(&is.iloc));
 302        EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 303        ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 304        ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 305        get_bh(is.iloc.bh);
 306        error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 307
 308out:
 309        brelse(is.iloc.bh);
 310        return error;
 311}
 312
 313static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 314                                   unsigned int len)
 315{
 316        int error;
 317        void *value = NULL;
 318        struct ext4_xattr_ibody_find is = {
 319                .s = { .not_found = -ENODATA, },
 320        };
 321        struct ext4_xattr_info i = {
 322                .name_index = EXT4_XATTR_INDEX_SYSTEM,
 323                .name = EXT4_XATTR_SYSTEM_DATA,
 324        };
 325
 326        /* If the old space is ok, write the data directly. */
 327        if (len <= EXT4_I(inode)->i_inline_size)
 328                return 0;
 329
 330        error = ext4_get_inode_loc(inode, &is.iloc);
 331        if (error)
 332                return error;
 333
 334        error = ext4_xattr_ibody_find(inode, &i, &is);
 335        if (error)
 336                goto out;
 337
 338        BUG_ON(is.s.not_found);
 339
 340        len -= EXT4_MIN_INLINE_DATA_SIZE;
 341        value = kzalloc(len, GFP_NOFS);
 342        if (!value) {
 343                error = -ENOMEM;
 344                goto out;
 345        }
 346
 347        error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 348                                     value, len);
 349        if (error == -ENODATA)
 350                goto out;
 351
 352        BUFFER_TRACE(is.iloc.bh, "get_write_access");
 353        error = ext4_journal_get_write_access(handle, is.iloc.bh);
 354        if (error)
 355                goto out;
 356
 357        /* Update the xttr entry. */
 358        i.value = value;
 359        i.value_len = len;
 360
 361        error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 362        if (error)
 363                goto out;
 364
 365        EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 366                                      (void *)ext4_raw_inode(&is.iloc));
 367        EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 368                                le32_to_cpu(is.s.here->e_value_size);
 369        ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 370        get_bh(is.iloc.bh);
 371        error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 372
 373out:
 374        kfree(value);
 375        brelse(is.iloc.bh);
 376        return error;
 377}
 378
 379static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 380                                    unsigned int len)
 381{
 382        int ret, size, no_expand;
 383        struct ext4_inode_info *ei = EXT4_I(inode);
 384
 385        if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 386                return -ENOSPC;
 387
 388        size = ext4_get_max_inline_size(inode);
 389        if (size < len)
 390                return -ENOSPC;
 391
 392        ext4_write_lock_xattr(inode, &no_expand);
 393
 394        if (ei->i_inline_off)
 395                ret = ext4_update_inline_data(handle, inode, len);
 396        else
 397                ret = ext4_create_inline_data(handle, inode, len);
 398
 399        ext4_write_unlock_xattr(inode, &no_expand);
 400        return ret;
 401}
 402
 403static int ext4_destroy_inline_data_nolock(handle_t *handle,
 404                                           struct inode *inode)
 405{
 406        struct ext4_inode_info *ei = EXT4_I(inode);
 407        struct ext4_xattr_ibody_find is = {
 408                .s = { .not_found = 0, },
 409        };
 410        struct ext4_xattr_info i = {
 411                .name_index = EXT4_XATTR_INDEX_SYSTEM,
 412                .name = EXT4_XATTR_SYSTEM_DATA,
 413                .value = NULL,
 414                .value_len = 0,
 415        };
 416        int error;
 417
 418        if (!ei->i_inline_off)
 419                return 0;
 420
 421        error = ext4_get_inode_loc(inode, &is.iloc);
 422        if (error)
 423                return error;
 424
 425        error = ext4_xattr_ibody_find(inode, &i, &is);
 426        if (error)
 427                goto out;
 428
 429        BUFFER_TRACE(is.iloc.bh, "get_write_access");
 430        error = ext4_journal_get_write_access(handle, is.iloc.bh);
 431        if (error)
 432                goto out;
 433
 434        error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 435        if (error)
 436                goto out;
 437
 438        memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 439                0, EXT4_MIN_INLINE_DATA_SIZE);
 440        memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 441
 442        if (ext4_has_feature_extents(inode->i_sb)) {
 443                if (S_ISDIR(inode->i_mode) ||
 444                    S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 445                        ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 446                        ext4_ext_tree_init(handle, inode);
 447                }
 448        }
 449        ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 450
 451        get_bh(is.iloc.bh);
 452        error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 453
 454        EXT4_I(inode)->i_inline_off = 0;
 455        EXT4_I(inode)->i_inline_size = 0;
 456        ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 457out:
 458        brelse(is.iloc.bh);
 459        if (error == -ENODATA)
 460                error = 0;
 461        return error;
 462}
 463
 464static int ext4_read_inline_page(struct inode *inode, struct page *page)
 465{
 466        void *kaddr;
 467        int ret = 0;
 468        size_t len;
 469        struct ext4_iloc iloc;
 470
 471        BUG_ON(!PageLocked(page));
 472        BUG_ON(!ext4_has_inline_data(inode));
 473        BUG_ON(page->index);
 474
 475        if (!EXT4_I(inode)->i_inline_off) {
 476                ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 477                             inode->i_ino);
 478                goto out;
 479        }
 480
 481        ret = ext4_get_inode_loc(inode, &iloc);
 482        if (ret)
 483                goto out;
 484
 485        len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 486        kaddr = kmap_atomic(page);
 487        ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 488        flush_dcache_page(page);
 489        kunmap_atomic(kaddr);
 490        zero_user_segment(page, len, PAGE_SIZE);
 491        SetPageUptodate(page);
 492        brelse(iloc.bh);
 493
 494out:
 495        return ret;
 496}
 497
 498int ext4_readpage_inline(struct inode *inode, struct page *page)
 499{
 500        int ret = 0;
 501
 502        down_read(&EXT4_I(inode)->xattr_sem);
 503        if (!ext4_has_inline_data(inode)) {
 504                up_read(&EXT4_I(inode)->xattr_sem);
 505                return -EAGAIN;
 506        }
 507
 508        /*
 509         * Current inline data can only exist in the 1st page,
 510         * So for all the other pages, just set them uptodate.
 511         */
 512        if (!page->index)
 513                ret = ext4_read_inline_page(inode, page);
 514        else if (!PageUptodate(page)) {
 515                zero_user_segment(page, 0, PAGE_SIZE);
 516                SetPageUptodate(page);
 517        }
 518
 519        up_read(&EXT4_I(inode)->xattr_sem);
 520
 521        unlock_page(page);
 522        return ret >= 0 ? 0 : ret;
 523}
 524
 525static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 526                                              struct inode *inode,
 527                                              unsigned flags)
 528{
 529        int ret, needed_blocks, no_expand;
 530        handle_t *handle = NULL;
 531        int retries = 0, sem_held = 0;
 532        struct page *page = NULL;
 533        unsigned from, to;
 534        struct ext4_iloc iloc;
 535
 536        if (!ext4_has_inline_data(inode)) {
 537                /*
 538                 * clear the flag so that no new write
 539                 * will trap here again.
 540                 */
 541                ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 542                return 0;
 543        }
 544
 545        needed_blocks = ext4_writepage_trans_blocks(inode);
 546
 547        ret = ext4_get_inode_loc(inode, &iloc);
 548        if (ret)
 549                return ret;
 550
 551retry:
 552        handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 553        if (IS_ERR(handle)) {
 554                ret = PTR_ERR(handle);
 555                handle = NULL;
 556                goto out;
 557        }
 558
 559        /* We cannot recurse into the filesystem as the transaction is already
 560         * started */
 561        flags |= AOP_FLAG_NOFS;
 562
 563        page = grab_cache_page_write_begin(mapping, 0, flags);
 564        if (!page) {
 565                ret = -ENOMEM;
 566                goto out;
 567        }
 568
 569        ext4_write_lock_xattr(inode, &no_expand);
 570        sem_held = 1;
 571        /* If some one has already done this for us, just exit. */
 572        if (!ext4_has_inline_data(inode)) {
 573                ret = 0;
 574                goto out;
 575        }
 576
 577        from = 0;
 578        to = ext4_get_inline_size(inode);
 579        if (!PageUptodate(page)) {
 580                ret = ext4_read_inline_page(inode, page);
 581                if (ret < 0)
 582                        goto out;
 583        }
 584
 585        ret = ext4_destroy_inline_data_nolock(handle, inode);
 586        if (ret)
 587                goto out;
 588
 589        if (ext4_should_dioread_nolock(inode)) {
 590                ret = __block_write_begin(page, from, to,
 591                                          ext4_get_block_unwritten);
 592        } else
 593                ret = __block_write_begin(page, from, to, ext4_get_block);
 594
 595        if (!ret && ext4_should_journal_data(inode)) {
 596                ret = ext4_walk_page_buffers(handle, page_buffers(page),
 597                                             from, to, NULL,
 598                                             do_journal_get_write_access);
 599        }
 600
 601        if (ret) {
 602                unlock_page(page);
 603                put_page(page);
 604                page = NULL;
 605                ext4_orphan_add(handle, inode);
 606                ext4_write_unlock_xattr(inode, &no_expand);
 607                sem_held = 0;
 608                ext4_journal_stop(handle);
 609                handle = NULL;
 610                ext4_truncate_failed_write(inode);
 611                /*
 612                 * If truncate failed early the inode might
 613                 * still be on the orphan list; we need to
 614                 * make sure the inode is removed from the
 615                 * orphan list in that case.
 616                 */
 617                if (inode->i_nlink)
 618                        ext4_orphan_del(NULL, inode);
 619        }
 620
 621        if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 622                goto retry;
 623
 624        if (page)
 625                block_commit_write(page, from, to);
 626out:
 627        if (page) {
 628                unlock_page(page);
 629                put_page(page);
 630        }
 631        if (sem_held)
 632                ext4_write_unlock_xattr(inode, &no_expand);
 633        if (handle)
 634                ext4_journal_stop(handle);
 635        brelse(iloc.bh);
 636        return ret;
 637}
 638
 639/*
 640 * Try to write data in the inode.
 641 * If the inode has inline data, check whether the new write can be
 642 * in the inode also. If not, create the page the handle, move the data
 643 * to the page make it update and let the later codes create extent for it.
 644 */
 645int ext4_try_to_write_inline_data(struct address_space *mapping,
 646                                  struct inode *inode,
 647                                  loff_t pos, unsigned len,
 648                                  unsigned flags,
 649                                  struct page **pagep)
 650{
 651        int ret;
 652        handle_t *handle;
 653        struct page *page;
 654        struct ext4_iloc iloc;
 655
 656        if (pos + len > ext4_get_max_inline_size(inode))
 657                goto convert;
 658
 659        ret = ext4_get_inode_loc(inode, &iloc);
 660        if (ret)
 661                return ret;
 662
 663        /*
 664         * The possible write could happen in the inode,
 665         * so try to reserve the space in inode first.
 666         */
 667        handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 668        if (IS_ERR(handle)) {
 669                ret = PTR_ERR(handle);
 670                handle = NULL;
 671                goto out;
 672        }
 673
 674        ret = ext4_prepare_inline_data(handle, inode, pos + len);
 675        if (ret && ret != -ENOSPC)
 676                goto out;
 677
 678        /* We don't have space in inline inode, so convert it to extent. */
 679        if (ret == -ENOSPC) {
 680                ext4_journal_stop(handle);
 681                brelse(iloc.bh);
 682                goto convert;
 683        }
 684
 685        ret = ext4_journal_get_write_access(handle, iloc.bh);
 686        if (ret)
 687                goto out;
 688
 689        flags |= AOP_FLAG_NOFS;
 690
 691        page = grab_cache_page_write_begin(mapping, 0, flags);
 692        if (!page) {
 693                ret = -ENOMEM;
 694                goto out;
 695        }
 696
 697        *pagep = page;
 698        down_read(&EXT4_I(inode)->xattr_sem);
 699        if (!ext4_has_inline_data(inode)) {
 700                ret = 0;
 701                unlock_page(page);
 702                put_page(page);
 703                goto out_up_read;
 704        }
 705
 706        if (!PageUptodate(page)) {
 707                ret = ext4_read_inline_page(inode, page);
 708                if (ret < 0)
 709                        goto out_up_read;
 710        }
 711
 712        ret = 1;
 713        handle = NULL;
 714out_up_read:
 715        up_read(&EXT4_I(inode)->xattr_sem);
 716out:
 717        if (handle && (ret != 1))
 718                ext4_journal_stop(handle);
 719        brelse(iloc.bh);
 720        return ret;
 721convert:
 722        return ext4_convert_inline_data_to_extent(mapping,
 723                                                  inode, flags);
 724}
 725
 726int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 727                               unsigned copied, struct page *page)
 728{
 729        int ret, no_expand;
 730        void *kaddr;
 731        struct ext4_iloc iloc;
 732
 733        if (unlikely(copied < len)) {
 734                if (!PageUptodate(page)) {
 735                        copied = 0;
 736                        goto out;
 737                }
 738        }
 739
 740        ret = ext4_get_inode_loc(inode, &iloc);
 741        if (ret) {
 742                ext4_std_error(inode->i_sb, ret);
 743                copied = 0;
 744                goto out;
 745        }
 746
 747        ext4_write_lock_xattr(inode, &no_expand);
 748        BUG_ON(!ext4_has_inline_data(inode));
 749
 750        kaddr = kmap_atomic(page);
 751        ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 752        kunmap_atomic(kaddr);
 753        SetPageUptodate(page);
 754        /* clear page dirty so that writepages wouldn't work for us. */
 755        ClearPageDirty(page);
 756
 757        ext4_write_unlock_xattr(inode, &no_expand);
 758        brelse(iloc.bh);
 759        mark_inode_dirty(inode);
 760out:
 761        return copied;
 762}
 763
 764struct buffer_head *
 765ext4_journalled_write_inline_data(struct inode *inode,
 766                                  unsigned len,
 767                                  struct page *page)
 768{
 769        int ret, no_expand;
 770        void *kaddr;
 771        struct ext4_iloc iloc;
 772
 773        ret = ext4_get_inode_loc(inode, &iloc);
 774        if (ret) {
 775                ext4_std_error(inode->i_sb, ret);
 776                return NULL;
 777        }
 778
 779        ext4_write_lock_xattr(inode, &no_expand);
 780        kaddr = kmap_atomic(page);
 781        ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 782        kunmap_atomic(kaddr);
 783        ext4_write_unlock_xattr(inode, &no_expand);
 784
 785        return iloc.bh;
 786}
 787
 788/*
 789 * Try to make the page cache and handle ready for the inline data case.
 790 * We can call this function in 2 cases:
 791 * 1. The inode is created and the first write exceeds inline size. We can
 792 *    clear the inode state safely.
 793 * 2. The inode has inline data, then we need to read the data, make it
 794 *    update and dirty so that ext4_da_writepages can handle it. We don't
 795 *    need to start the journal since the file's metatdata isn't changed now.
 796 */
 797static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 798                                                 struct inode *inode,
 799                                                 unsigned flags,
 800                                                 void **fsdata)
 801{
 802        int ret = 0, inline_size;
 803        struct page *page;
 804
 805        page = grab_cache_page_write_begin(mapping, 0, flags);
 806        if (!page)
 807                return -ENOMEM;
 808
 809        down_read(&EXT4_I(inode)->xattr_sem);
 810        if (!ext4_has_inline_data(inode)) {
 811                ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 812                goto out;
 813        }
 814
 815        inline_size = ext4_get_inline_size(inode);
 816
 817        if (!PageUptodate(page)) {
 818                ret = ext4_read_inline_page(inode, page);
 819                if (ret < 0)
 820                        goto out;
 821        }
 822
 823        ret = __block_write_begin(page, 0, inline_size,
 824                                  ext4_da_get_block_prep);
 825        if (ret) {
 826                up_read(&EXT4_I(inode)->xattr_sem);
 827                unlock_page(page);
 828                put_page(page);
 829                ext4_truncate_failed_write(inode);
 830                return ret;
 831        }
 832
 833        SetPageDirty(page);
 834        SetPageUptodate(page);
 835        ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 836        *fsdata = (void *)CONVERT_INLINE_DATA;
 837
 838out:
 839        up_read(&EXT4_I(inode)->xattr_sem);
 840        if (page) {
 841                unlock_page(page);
 842                put_page(page);
 843        }
 844        return ret;
 845}
 846
 847/*
 848 * Prepare the write for the inline data.
 849 * If the the data can be written into the inode, we just read
 850 * the page and make it uptodate, and start the journal.
 851 * Otherwise read the page, makes it dirty so that it can be
 852 * handle in writepages(the i_disksize update is left to the
 853 * normal ext4_da_write_end).
 854 */
 855int ext4_da_write_inline_data_begin(struct address_space *mapping,
 856                                    struct inode *inode,
 857                                    loff_t pos, unsigned len,
 858                                    unsigned flags,
 859                                    struct page **pagep,
 860                                    void **fsdata)
 861{
 862        int ret, inline_size;
 863        handle_t *handle;
 864        struct page *page;
 865        struct ext4_iloc iloc;
 866        int retries = 0;
 867
 868        ret = ext4_get_inode_loc(inode, &iloc);
 869        if (ret)
 870                return ret;
 871
 872retry_journal:
 873        handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 874        if (IS_ERR(handle)) {
 875                ret = PTR_ERR(handle);
 876                goto out;
 877        }
 878
 879        inline_size = ext4_get_max_inline_size(inode);
 880
 881        ret = -ENOSPC;
 882        if (inline_size >= pos + len) {
 883                ret = ext4_prepare_inline_data(handle, inode, pos + len);
 884                if (ret && ret != -ENOSPC)
 885                        goto out_journal;
 886        }
 887
 888        /*
 889         * We cannot recurse into the filesystem as the transaction
 890         * is already started.
 891         */
 892        flags |= AOP_FLAG_NOFS;
 893
 894        if (ret == -ENOSPC) {
 895                ext4_journal_stop(handle);
 896                ret = ext4_da_convert_inline_data_to_extent(mapping,
 897                                                            inode,
 898                                                            flags,
 899                                                            fsdata);
 900                if (ret == -ENOSPC &&
 901                    ext4_should_retry_alloc(inode->i_sb, &retries))
 902                        goto retry_journal;
 903                goto out;
 904        }
 905
 906        page = grab_cache_page_write_begin(mapping, 0, flags);
 907        if (!page) {
 908                ret = -ENOMEM;
 909                goto out_journal;
 910        }
 911
 912        down_read(&EXT4_I(inode)->xattr_sem);
 913        if (!ext4_has_inline_data(inode)) {
 914                ret = 0;
 915                goto out_release_page;
 916        }
 917
 918        if (!PageUptodate(page)) {
 919                ret = ext4_read_inline_page(inode, page);
 920                if (ret < 0)
 921                        goto out_release_page;
 922        }
 923        ret = ext4_journal_get_write_access(handle, iloc.bh);
 924        if (ret)
 925                goto out_release_page;
 926
 927        up_read(&EXT4_I(inode)->xattr_sem);
 928        *pagep = page;
 929        brelse(iloc.bh);
 930        return 1;
 931out_release_page:
 932        up_read(&EXT4_I(inode)->xattr_sem);
 933        unlock_page(page);
 934        put_page(page);
 935out_journal:
 936        ext4_journal_stop(handle);
 937out:
 938        brelse(iloc.bh);
 939        return ret;
 940}
 941
 942int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 943                                  unsigned len, unsigned copied,
 944                                  struct page *page)
 945{
 946        int ret;
 947
 948        ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 949        if (ret < 0) {
 950                unlock_page(page);
 951                put_page(page);
 952                return ret;
 953        }
 954        copied = ret;
 955
 956        /*
 957         * No need to use i_size_read() here, the i_size
 958         * cannot change under us because we hold i_mutex.
 959         *
 960         * But it's important to update i_size while still holding page lock:
 961         * page writeout could otherwise come in and zero beyond i_size.
 962         */
 963        if (pos+copied > inode->i_size)
 964                i_size_write(inode, pos+copied);
 965        unlock_page(page);
 966        put_page(page);
 967
 968        /*
 969         * Don't mark the inode dirty under page lock. First, it unnecessarily
 970         * makes the holding time of page lock longer. Second, it forces lock
 971         * ordering of page lock and transaction start for journaling
 972         * filesystems.
 973         */
 974        mark_inode_dirty(inode);
 975
 976        return copied;
 977}
 978
 979#ifdef INLINE_DIR_DEBUG
 980void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 981                          void *inline_start, int inline_size)
 982{
 983        int offset;
 984        unsigned short de_len;
 985        struct ext4_dir_entry_2 *de = inline_start;
 986        void *dlimit = inline_start + inline_size;
 987
 988        trace_printk("inode %lu\n", dir->i_ino);
 989        offset = 0;
 990        while ((void *)de < dlimit) {
 991                de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 992                trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 993                             offset, de_len, de->name_len, de->name,
 994                             de->name_len, le32_to_cpu(de->inode));
 995                if (ext4_check_dir_entry(dir, NULL, de, bh,
 996                                         inline_start, inline_size, offset))
 997                        BUG();
 998
 999                offset += de_len;
1000                de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1001        }
1002}
1003#else
1004#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1005#endif
1006
1007/*
1008 * Add a new entry into a inline dir.
1009 * It will return -ENOSPC if no space is available, and -EIO
1010 * and -EEXIST if directory entry already exists.
1011 */
1012static int ext4_add_dirent_to_inline(handle_t *handle,
1013                                     struct ext4_filename *fname,
1014                                     struct inode *dir,
1015                                     struct inode *inode,
1016                                     struct ext4_iloc *iloc,
1017                                     void *inline_start, int inline_size)
1018{
1019        int             err;
1020        struct ext4_dir_entry_2 *de;
1021
1022        err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1023                                inline_size, fname, &de);
1024        if (err)
1025                return err;
1026
1027        BUFFER_TRACE(iloc->bh, "get_write_access");
1028        err = ext4_journal_get_write_access(handle, iloc->bh);
1029        if (err)
1030                return err;
1031        ext4_insert_dentry(inode, de, inline_size, fname);
1032
1033        ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1034
1035        /*
1036         * XXX shouldn't update any times until successful
1037         * completion of syscall, but too many callers depend
1038         * on this.
1039         *
1040         * XXX similarly, too many callers depend on
1041         * ext4_new_inode() setting the times, but error
1042         * recovery deletes the inode, so the worst that can
1043         * happen is that the times are slightly out of date
1044         * and/or different from the directory change time.
1045         */
1046        dir->i_mtime = dir->i_ctime = current_time(dir);
1047        ext4_update_dx_flag(dir);
1048        inode_inc_iversion(dir);
1049        return 1;
1050}
1051
1052static void *ext4_get_inline_xattr_pos(struct inode *inode,
1053                                       struct ext4_iloc *iloc)
1054{
1055        struct ext4_xattr_entry *entry;
1056        struct ext4_xattr_ibody_header *header;
1057
1058        BUG_ON(!EXT4_I(inode)->i_inline_off);
1059
1060        header = IHDR(inode, ext4_raw_inode(iloc));
1061        entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1062                                            EXT4_I(inode)->i_inline_off);
1063
1064        return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1065}
1066
1067/* Set the final de to cover the whole block. */
1068static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1069{
1070        struct ext4_dir_entry_2 *de, *prev_de;
1071        void *limit;
1072        int de_len;
1073
1074        de = (struct ext4_dir_entry_2 *)de_buf;
1075        if (old_size) {
1076                limit = de_buf + old_size;
1077                do {
1078                        prev_de = de;
1079                        de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1080                        de_buf += de_len;
1081                        de = (struct ext4_dir_entry_2 *)de_buf;
1082                } while (de_buf < limit);
1083
1084                prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1085                                                        old_size, new_size);
1086        } else {
1087                /* this is just created, so create an empty entry. */
1088                de->inode = 0;
1089                de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1090        }
1091}
1092
1093static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1094                                  struct ext4_iloc *iloc)
1095{
1096        int ret;
1097        int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1098        int new_size = get_max_inline_xattr_value_size(dir, iloc);
1099
1100        if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1101                return -ENOSPC;
1102
1103        ret = ext4_update_inline_data(handle, dir,
1104                                      new_size + EXT4_MIN_INLINE_DATA_SIZE);
1105        if (ret)
1106                return ret;
1107
1108        ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1109                             EXT4_I(dir)->i_inline_size -
1110                                                EXT4_MIN_INLINE_DATA_SIZE);
1111        dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1112        return 0;
1113}
1114
1115static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1116                                     struct ext4_iloc *iloc,
1117                                     void *buf, int inline_size)
1118{
1119        ext4_create_inline_data(handle, inode, inline_size);
1120        ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1121        ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1122}
1123
1124static int ext4_finish_convert_inline_dir(handle_t *handle,
1125                                          struct inode *inode,
1126                                          struct buffer_head *dir_block,
1127                                          void *buf,
1128                                          int inline_size)
1129{
1130        int err, csum_size = 0, header_size = 0;
1131        struct ext4_dir_entry_2 *de;
1132        struct ext4_dir_entry_tail *t;
1133        void *target = dir_block->b_data;
1134
1135        /*
1136         * First create "." and ".." and then copy the dir information
1137         * back to the block.
1138         */
1139        de = (struct ext4_dir_entry_2 *)target;
1140        de = ext4_init_dot_dotdot(inode, de,
1141                inode->i_sb->s_blocksize, csum_size,
1142                le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1143        header_size = (void *)de - target;
1144
1145        memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1146                inline_size - EXT4_INLINE_DOTDOT_SIZE);
1147
1148        if (ext4_has_metadata_csum(inode->i_sb))
1149                csum_size = sizeof(struct ext4_dir_entry_tail);
1150
1151        inode->i_size = inode->i_sb->s_blocksize;
1152        i_size_write(inode, inode->i_sb->s_blocksize);
1153        EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1154        ext4_update_final_de(dir_block->b_data,
1155                        inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1156                        inode->i_sb->s_blocksize - csum_size);
1157
1158        if (csum_size) {
1159                t = EXT4_DIRENT_TAIL(dir_block->b_data,
1160                                     inode->i_sb->s_blocksize);
1161                initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1162        }
1163        set_buffer_uptodate(dir_block);
1164        err = ext4_handle_dirty_dirent_node(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, data_bh);
1227        if (error) {
1228                unlock_buffer(data_bh);
1229                error = -EIO;
1230                goto out_restore;
1231        }
1232        memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1233
1234        if (!S_ISDIR(inode->i_mode)) {
1235                memcpy(data_bh->b_data, buf, inline_size);
1236                set_buffer_uptodate(data_bh);
1237                error = ext4_handle_dirty_metadata(handle,
1238                                                   inode, data_bh);
1239        } else {
1240                error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1241                                                       buf, inline_size);
1242        }
1243
1244        unlock_buffer(data_bh);
1245out_restore:
1246        if (error)
1247                ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1248
1249out:
1250        brelse(data_bh);
1251        kfree(buf);
1252        return error;
1253}
1254
1255/*
1256 * Try to add the new entry to the inline data.
1257 * If succeeds, return 0. If not, extended the inline dir and copied data to
1258 * the new created block.
1259 */
1260int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1261                              struct inode *dir, struct inode *inode)
1262{
1263        int ret, inline_size, no_expand;
1264        void *inline_start;
1265        struct ext4_iloc iloc;
1266
1267        ret = ext4_get_inode_loc(dir, &iloc);
1268        if (ret)
1269                return ret;
1270
1271        ext4_write_lock_xattr(dir, &no_expand);
1272        if (!ext4_has_inline_data(dir))
1273                goto out;
1274
1275        inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1276                                                 EXT4_INLINE_DOTDOT_SIZE;
1277        inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1278
1279        ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1280                                        inline_start, inline_size);
1281        if (ret != -ENOSPC)
1282                goto out;
1283
1284        /* check whether it can be inserted to inline xattr space. */
1285        inline_size = EXT4_I(dir)->i_inline_size -
1286                        EXT4_MIN_INLINE_DATA_SIZE;
1287        if (!inline_size) {
1288                /* Try to use the xattr space.*/
1289                ret = ext4_update_inline_dir(handle, dir, &iloc);
1290                if (ret && ret != -ENOSPC)
1291                        goto out;
1292
1293                inline_size = EXT4_I(dir)->i_inline_size -
1294                                EXT4_MIN_INLINE_DATA_SIZE;
1295        }
1296
1297        if (inline_size) {
1298                inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1299
1300                ret = ext4_add_dirent_to_inline(handle, fname, dir,
1301                                                inode, &iloc, inline_start,
1302                                                inline_size);
1303
1304                if (ret != -ENOSPC)
1305                        goto out;
1306        }
1307
1308        /*
1309         * The inline space is filled up, so create a new block for it.
1310         * As the extent tree will be created, we have to save the inline
1311         * dir first.
1312         */
1313        ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1314
1315out:
1316        ext4_write_unlock_xattr(dir, &no_expand);
1317        ext4_mark_inode_dirty(handle, dir);
1318        brelse(iloc.bh);
1319        return ret;
1320}
1321
1322/*
1323 * This function fills a red-black tree with information from an
1324 * inlined dir.  It returns the number directory entries loaded
1325 * into the tree.  If there is an error it is returned in err.
1326 */
1327int htree_inlinedir_to_tree(struct file *dir_file,
1328                            struct inode *dir, ext4_lblk_t block,
1329                            struct dx_hash_info *hinfo,
1330                            __u32 start_hash, __u32 start_minor_hash,
1331                            int *has_inline_data)
1332{
1333        int err = 0, count = 0;
1334        unsigned int parent_ino;
1335        int pos;
1336        struct ext4_dir_entry_2 *de;
1337        struct inode *inode = file_inode(dir_file);
1338        int ret, inline_size = 0;
1339        struct ext4_iloc iloc;
1340        void *dir_buf = NULL;
1341        struct ext4_dir_entry_2 fake;
1342        struct fscrypt_str tmp_str;
1343
1344        ret = ext4_get_inode_loc(inode, &iloc);
1345        if (ret)
1346                return ret;
1347
1348        down_read(&EXT4_I(inode)->xattr_sem);
1349        if (!ext4_has_inline_data(inode)) {
1350                up_read(&EXT4_I(inode)->xattr_sem);
1351                *has_inline_data = 0;
1352                goto out;
1353        }
1354
1355        inline_size = ext4_get_inline_size(inode);
1356        dir_buf = kmalloc(inline_size, GFP_NOFS);
1357        if (!dir_buf) {
1358                ret = -ENOMEM;
1359                up_read(&EXT4_I(inode)->xattr_sem);
1360                goto out;
1361        }
1362
1363        ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1364        up_read(&EXT4_I(inode)->xattr_sem);
1365        if (ret < 0)
1366                goto out;
1367
1368        pos = 0;
1369        parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1370        while (pos < inline_size) {
1371                /*
1372                 * As inlined dir doesn't store any information about '.' and
1373                 * only the inode number of '..' is stored, we have to handle
1374                 * them differently.
1375                 */
1376                if (pos == 0) {
1377                        fake.inode = cpu_to_le32(inode->i_ino);
1378                        fake.name_len = 1;
1379                        strcpy(fake.name, ".");
1380                        fake.rec_len = ext4_rec_len_to_disk(
1381                                                EXT4_DIR_REC_LEN(fake.name_len),
1382                                                inline_size);
1383                        ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1384                        de = &fake;
1385                        pos = EXT4_INLINE_DOTDOT_OFFSET;
1386                } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1387                        fake.inode = cpu_to_le32(parent_ino);
1388                        fake.name_len = 2;
1389                        strcpy(fake.name, "..");
1390                        fake.rec_len = ext4_rec_len_to_disk(
1391                                                EXT4_DIR_REC_LEN(fake.name_len),
1392                                                inline_size);
1393                        ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1394                        de = &fake;
1395                        pos = EXT4_INLINE_DOTDOT_SIZE;
1396                } else {
1397                        de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1398                        pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1399                        if (ext4_check_dir_entry(inode, dir_file, de,
1400                                         iloc.bh, dir_buf,
1401                                         inline_size, pos)) {
1402                                ret = count;
1403                                goto out;
1404                        }
1405                }
1406
1407                ext4fs_dirhash(de->name, de->name_len, hinfo);
1408                if ((hinfo->hash < start_hash) ||
1409                    ((hinfo->hash == start_hash) &&
1410                     (hinfo->minor_hash < start_minor_hash)))
1411                        continue;
1412                if (de->inode == 0)
1413                        continue;
1414                tmp_str.name = de->name;
1415                tmp_str.len = de->name_len;
1416                err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1417                                              hinfo->minor_hash, de, &tmp_str);
1418                if (err) {
1419                        count = err;
1420                        goto out;
1421                }
1422                count++;
1423        }
1424        ret = count;
1425out:
1426        kfree(dir_buf);
1427        brelse(iloc.bh);
1428        return ret;
1429}
1430
1431/*
1432 * So this function is called when the volume is mkfsed with
1433 * dir_index disabled. In order to keep f_pos persistent
1434 * after we convert from an inlined dir to a blocked based,
1435 * we just pretend that we are a normal dir and return the
1436 * offset as if '.' and '..' really take place.
1437 *
1438 */
1439int ext4_read_inline_dir(struct file *file,
1440                         struct dir_context *ctx,
1441                         int *has_inline_data)
1442{
1443        unsigned int offset, parent_ino;
1444        int i;
1445        struct ext4_dir_entry_2 *de;
1446        struct super_block *sb;
1447        struct inode *inode = file_inode(file);
1448        int ret, inline_size = 0;
1449        struct ext4_iloc iloc;
1450        void *dir_buf = NULL;
1451        int dotdot_offset, dotdot_size, extra_offset, extra_size;
1452
1453        ret = ext4_get_inode_loc(inode, &iloc);
1454        if (ret)
1455                return ret;
1456
1457        down_read(&EXT4_I(inode)->xattr_sem);
1458        if (!ext4_has_inline_data(inode)) {
1459                up_read(&EXT4_I(inode)->xattr_sem);
1460                *has_inline_data = 0;
1461                goto out;
1462        }
1463
1464        inline_size = ext4_get_inline_size(inode);
1465        dir_buf = kmalloc(inline_size, GFP_NOFS);
1466        if (!dir_buf) {
1467                ret = -ENOMEM;
1468                up_read(&EXT4_I(inode)->xattr_sem);
1469                goto out;
1470        }
1471
1472        ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1473        up_read(&EXT4_I(inode)->xattr_sem);
1474        if (ret < 0)
1475                goto out;
1476
1477        ret = 0;
1478        sb = inode->i_sb;
1479        parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1480        offset = ctx->pos;
1481
1482        /*
1483         * dotdot_offset and dotdot_size is the real offset and
1484         * size for ".." and "." if the dir is block based while
1485         * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1486         * So we will use extra_offset and extra_size to indicate them
1487         * during the inline dir iteration.
1488         */
1489        dotdot_offset = EXT4_DIR_REC_LEN(1);
1490        dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1491        extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1492        extra_size = extra_offset + inline_size;
1493
1494        /*
1495         * If the version has changed since the last call to
1496         * readdir(2), then we might be pointing to an invalid
1497         * dirent right now.  Scan from the start of the inline
1498         * dir to make sure.
1499         */
1500        if (!inode_eq_iversion(inode, file->f_version)) {
1501                for (i = 0; i < extra_size && i < offset;) {
1502                        /*
1503                         * "." is with offset 0 and
1504                         * ".." is dotdot_offset.
1505                         */
1506                        if (!i) {
1507                                i = dotdot_offset;
1508                                continue;
1509                        } else if (i == dotdot_offset) {
1510                                i = dotdot_size;
1511                                continue;
1512                        }
1513                        /* for other entry, the real offset in
1514                         * the buf has to be tuned accordingly.
1515                         */
1516                        de = (struct ext4_dir_entry_2 *)
1517                                (dir_buf + i - extra_offset);
1518                        /* It's too expensive to do a full
1519                         * dirent test each time round this
1520                         * loop, but we do have to test at
1521                         * least that it is non-zero.  A
1522                         * failure will be detected in the
1523                         * dirent test below. */
1524                        if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1525                                < EXT4_DIR_REC_LEN(1))
1526                                break;
1527                        i += ext4_rec_len_from_disk(de->rec_len,
1528                                                    extra_size);
1529                }
1530                offset = i;
1531                ctx->pos = offset;
1532                file->f_version = inode_query_iversion(inode);
1533        }
1534
1535        while (ctx->pos < extra_size) {
1536                if (ctx->pos == 0) {
1537                        if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1538                                goto out;
1539                        ctx->pos = dotdot_offset;
1540                        continue;
1541                }
1542
1543                if (ctx->pos == dotdot_offset) {
1544                        if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1545                                goto out;
1546                        ctx->pos = dotdot_size;
1547                        continue;
1548                }
1549
1550                de = (struct ext4_dir_entry_2 *)
1551                        (dir_buf + ctx->pos - extra_offset);
1552                if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1553                                         extra_size, ctx->pos))
1554                        goto out;
1555                if (le32_to_cpu(de->inode)) {
1556                        if (!dir_emit(ctx, de->name, de->name_len,
1557                                      le32_to_cpu(de->inode),
1558                                      get_dtype(sb, de->file_type)))
1559                                goto out;
1560                }
1561                ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1562        }
1563out:
1564        kfree(dir_buf);
1565        brelse(iloc.bh);
1566        return ret;
1567}
1568
1569struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1570                                        struct ext4_dir_entry_2 **parent_de,
1571                                        int *retval)
1572{
1573        struct ext4_iloc iloc;
1574
1575        *retval = ext4_get_inode_loc(inode, &iloc);
1576        if (*retval)
1577                return NULL;
1578
1579        *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1580
1581        return iloc.bh;
1582}
1583
1584/*
1585 * Try to create the inline data for the new dir.
1586 * If it succeeds, return 0, otherwise return the error.
1587 * In case of ENOSPC, the caller should create the normal disk layout dir.
1588 */
1589int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1590                               struct inode *inode)
1591{
1592        int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1593        struct ext4_iloc iloc;
1594        struct ext4_dir_entry_2 *de;
1595
1596        ret = ext4_get_inode_loc(inode, &iloc);
1597        if (ret)
1598                return ret;
1599
1600        ret = ext4_prepare_inline_data(handle, inode, inline_size);
1601        if (ret)
1602                goto out;
1603
1604        /*
1605         * For inline dir, we only save the inode information for the ".."
1606         * and create a fake dentry to cover the left space.
1607         */
1608        de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1609        de->inode = cpu_to_le32(parent->i_ino);
1610        de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1611        de->inode = 0;
1612        de->rec_len = ext4_rec_len_to_disk(
1613                                inline_size - EXT4_INLINE_DOTDOT_SIZE,
1614                                inline_size);
1615        set_nlink(inode, 2);
1616        inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1617out:
1618        brelse(iloc.bh);
1619        return ret;
1620}
1621
1622struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1623                                        struct ext4_filename *fname,
1624                                        struct ext4_dir_entry_2 **res_dir,
1625                                        int *has_inline_data)
1626{
1627        int ret;
1628        struct ext4_iloc iloc;
1629        void *inline_start;
1630        int inline_size;
1631
1632        if (ext4_get_inode_loc(dir, &iloc))
1633                return NULL;
1634
1635        down_read(&EXT4_I(dir)->xattr_sem);
1636        if (!ext4_has_inline_data(dir)) {
1637                *has_inline_data = 0;
1638                goto out;
1639        }
1640
1641        inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1642                                                EXT4_INLINE_DOTDOT_SIZE;
1643        inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1644        ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1645                              dir, fname, 0, res_dir);
1646        if (ret == 1)
1647                goto out_find;
1648        if (ret < 0)
1649                goto out;
1650
1651        if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1652                goto out;
1653
1654        inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1655        inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1656
1657        ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1658                              dir, fname, 0, res_dir);
1659        if (ret == 1)
1660                goto out_find;
1661
1662out:
1663        brelse(iloc.bh);
1664        iloc.bh = NULL;
1665out_find:
1666        up_read(&EXT4_I(dir)->xattr_sem);
1667        return iloc.bh;
1668}
1669
1670int ext4_delete_inline_entry(handle_t *handle,
1671                             struct inode *dir,
1672                             struct ext4_dir_entry_2 *de_del,
1673                             struct buffer_head *bh,
1674                             int *has_inline_data)
1675{
1676        int err, inline_size, no_expand;
1677        struct ext4_iloc iloc;
1678        void *inline_start;
1679
1680        err = ext4_get_inode_loc(dir, &iloc);
1681        if (err)
1682                return err;
1683
1684        ext4_write_lock_xattr(dir, &no_expand);
1685        if (!ext4_has_inline_data(dir)) {
1686                *has_inline_data = 0;
1687                goto out;
1688        }
1689
1690        if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1691                EXT4_MIN_INLINE_DATA_SIZE) {
1692                inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1693                                        EXT4_INLINE_DOTDOT_SIZE;
1694                inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1695                                EXT4_INLINE_DOTDOT_SIZE;
1696        } else {
1697                inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1698                inline_size = ext4_get_inline_size(dir) -
1699                                EXT4_MIN_INLINE_DATA_SIZE;
1700        }
1701
1702        BUFFER_TRACE(bh, "get_write_access");
1703        err = ext4_journal_get_write_access(handle, bh);
1704        if (err)
1705                goto out;
1706
1707        err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1708                                        inline_start, inline_size, 0);
1709        if (err)
1710                goto out;
1711
1712        ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1713out:
1714        ext4_write_unlock_xattr(dir, &no_expand);
1715        if (likely(err == 0))
1716                err = ext4_mark_inode_dirty(handle, dir);
1717        brelse(iloc.bh);
1718        if (err != -ENOENT)
1719                ext4_std_error(dir->i_sb, err);
1720        return err;
1721}
1722
1723/*
1724 * Get the inline dentry at offset.
1725 */
1726static inline struct ext4_dir_entry_2 *
1727ext4_get_inline_entry(struct inode *inode,
1728                      struct ext4_iloc *iloc,
1729                      unsigned int offset,
1730                      void **inline_start,
1731                      int *inline_size)
1732{
1733        void *inline_pos;
1734
1735        BUG_ON(offset > ext4_get_inline_size(inode));
1736
1737        if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1738                inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1739                *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1740        } else {
1741                inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1742                offset -= EXT4_MIN_INLINE_DATA_SIZE;
1743                *inline_size = ext4_get_inline_size(inode) -
1744                                EXT4_MIN_INLINE_DATA_SIZE;
1745        }
1746
1747        if (inline_start)
1748                *inline_start = inline_pos;
1749        return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1750}
1751
1752bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1753{
1754        int err, inline_size;
1755        struct ext4_iloc iloc;
1756        size_t inline_len;
1757        void *inline_pos;
1758        unsigned int offset;
1759        struct ext4_dir_entry_2 *de;
1760        bool ret = true;
1761
1762        err = ext4_get_inode_loc(dir, &iloc);
1763        if (err) {
1764                EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1765                                 err, dir->i_ino);
1766                return true;
1767        }
1768
1769        down_read(&EXT4_I(dir)->xattr_sem);
1770        if (!ext4_has_inline_data(dir)) {
1771                *has_inline_data = 0;
1772                goto out;
1773        }
1774
1775        de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1776        if (!le32_to_cpu(de->inode)) {
1777                ext4_warning(dir->i_sb,
1778                             "bad inline directory (dir #%lu) - no `..'",
1779                             dir->i_ino);
1780                ret = true;
1781                goto out;
1782        }
1783
1784        inline_len = ext4_get_inline_size(dir);
1785        offset = EXT4_INLINE_DOTDOT_SIZE;
1786        while (offset < inline_len) {
1787                de = ext4_get_inline_entry(dir, &iloc, offset,
1788                                           &inline_pos, &inline_size);
1789                if (ext4_check_dir_entry(dir, NULL, de,
1790                                         iloc.bh, inline_pos,
1791                                         inline_size, offset)) {
1792                        ext4_warning(dir->i_sb,
1793                                     "bad inline directory (dir #%lu) - "
1794                                     "inode %u, rec_len %u, name_len %d"
1795                                     "inline size %d",
1796                                     dir->i_ino, le32_to_cpu(de->inode),
1797                                     le16_to_cpu(de->rec_len), de->name_len,
1798                                     inline_size);
1799                        ret = true;
1800                        goto out;
1801                }
1802                if (le32_to_cpu(de->inode)) {
1803                        ret = false;
1804                        goto out;
1805                }
1806                offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1807        }
1808
1809out:
1810        up_read(&EXT4_I(dir)->xattr_sem);
1811        brelse(iloc.bh);
1812        return ret;
1813}
1814
1815int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1816{
1817        int ret, no_expand;
1818
1819        ext4_write_lock_xattr(inode, &no_expand);
1820        ret = ext4_destroy_inline_data_nolock(handle, inode);
1821        ext4_write_unlock_xattr(inode, &no_expand);
1822
1823        return ret;
1824}
1825
1826int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1827{
1828        __u64 addr;
1829        int error = -EAGAIN;
1830        struct ext4_iloc iloc;
1831
1832        down_read(&EXT4_I(inode)->xattr_sem);
1833        if (!ext4_has_inline_data(inode))
1834                goto out;
1835
1836        error = ext4_get_inode_loc(inode, &iloc);
1837        if (error)
1838                goto out;
1839
1840        addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1841        addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1842        addr += offsetof(struct ext4_inode, i_block);
1843
1844        brelse(iloc.bh);
1845
1846        iomap->addr = addr;
1847        iomap->offset = 0;
1848        iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1849                              i_size_read(inode));
1850        iomap->type = IOMAP_INLINE;
1851        iomap->flags = 0;
1852
1853out:
1854        up_read(&EXT4_I(inode)->xattr_sem);
1855        return error;
1856}
1857
1858int ext4_inline_data_fiemap(struct inode *inode,
1859                            struct fiemap_extent_info *fieinfo,
1860                            int *has_inline, __u64 start, __u64 len)
1861{
1862        __u64 physical = 0;
1863        __u64 inline_len;
1864        __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1865                FIEMAP_EXTENT_LAST;
1866        int error = 0;
1867        struct ext4_iloc iloc;
1868
1869        down_read(&EXT4_I(inode)->xattr_sem);
1870        if (!ext4_has_inline_data(inode)) {
1871                *has_inline = 0;
1872                goto out;
1873        }
1874        inline_len = min_t(size_t, ext4_get_inline_size(inode),
1875                           i_size_read(inode));
1876        if (start >= inline_len)
1877                goto out;
1878        if (start + len < inline_len)
1879                inline_len = start + len;
1880        inline_len -= start;
1881
1882        error = ext4_get_inode_loc(inode, &iloc);
1883        if (error)
1884                goto out;
1885
1886        physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1887        physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1888        physical += offsetof(struct ext4_inode, i_block);
1889
1890        if (physical)
1891                error = fiemap_fill_next_extent(fieinfo, start, physical,
1892                                                inline_len, flags);
1893        brelse(iloc.bh);
1894out:
1895        up_read(&EXT4_I(inode)->xattr_sem);
1896        return (error < 0 ? error : 0);
1897}
1898
1899int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1900{
1901        handle_t *handle;
1902        int inline_size, value_len, needed_blocks, no_expand, err = 0;
1903        size_t i_size;
1904        void *value = NULL;
1905        struct ext4_xattr_ibody_find is = {
1906                .s = { .not_found = -ENODATA, },
1907        };
1908        struct ext4_xattr_info i = {
1909                .name_index = EXT4_XATTR_INDEX_SYSTEM,
1910                .name = EXT4_XATTR_SYSTEM_DATA,
1911        };
1912
1913
1914        needed_blocks = ext4_writepage_trans_blocks(inode);
1915        handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1916        if (IS_ERR(handle))
1917                return PTR_ERR(handle);
1918
1919        ext4_write_lock_xattr(inode, &no_expand);
1920        if (!ext4_has_inline_data(inode)) {
1921                *has_inline = 0;
1922                ext4_journal_stop(handle);
1923                return 0;
1924        }
1925
1926        if ((err = ext4_orphan_add(handle, inode)) != 0)
1927                goto out;
1928
1929        if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1930                goto out;
1931
1932        down_write(&EXT4_I(inode)->i_data_sem);
1933        i_size = inode->i_size;
1934        inline_size = ext4_get_inline_size(inode);
1935        EXT4_I(inode)->i_disksize = i_size;
1936
1937        if (i_size < inline_size) {
1938                /* Clear the content in the xattr space. */
1939                if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1940                        if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1941                                goto out_error;
1942
1943                        BUG_ON(is.s.not_found);
1944
1945                        value_len = le32_to_cpu(is.s.here->e_value_size);
1946                        value = kmalloc(value_len, GFP_NOFS);
1947                        if (!value) {
1948                                err = -ENOMEM;
1949                                goto out_error;
1950                        }
1951
1952                        err = ext4_xattr_ibody_get(inode, i.name_index,
1953                                                   i.name, value, value_len);
1954                        if (err <= 0)
1955                                goto out_error;
1956
1957                        i.value = value;
1958                        i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1959                                        i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1960                        err = ext4_xattr_ibody_inline_set(handle, inode,
1961                                                          &i, &is);
1962                        if (err)
1963                                goto out_error;
1964                }
1965
1966                /* Clear the content within i_blocks. */
1967                if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1968                        void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1969                        memset(p + i_size, 0,
1970                               EXT4_MIN_INLINE_DATA_SIZE - i_size);
1971                }
1972
1973                EXT4_I(inode)->i_inline_size = i_size <
1974                                        EXT4_MIN_INLINE_DATA_SIZE ?
1975                                        EXT4_MIN_INLINE_DATA_SIZE : i_size;
1976        }
1977
1978out_error:
1979        up_write(&EXT4_I(inode)->i_data_sem);
1980out:
1981        brelse(is.iloc.bh);
1982        ext4_write_unlock_xattr(inode, &no_expand);
1983        kfree(value);
1984        if (inode->i_nlink)
1985                ext4_orphan_del(handle, inode);
1986
1987        if (err == 0) {
1988                inode->i_mtime = inode->i_ctime = current_time(inode);
1989                err = ext4_mark_inode_dirty(handle, inode);
1990                if (IS_SYNC(inode))
1991                        ext4_handle_sync(handle);
1992        }
1993        ext4_journal_stop(handle);
1994        return err;
1995}
1996
1997int ext4_convert_inline_data(struct inode *inode)
1998{
1999        int error, needed_blocks, no_expand;
2000        handle_t *handle;
2001        struct ext4_iloc iloc;
2002
2003        if (!ext4_has_inline_data(inode)) {
2004                ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2005                return 0;
2006        }
2007
2008        needed_blocks = ext4_writepage_trans_blocks(inode);
2009
2010        iloc.bh = NULL;
2011        error = ext4_get_inode_loc(inode, &iloc);
2012        if (error)
2013                return error;
2014
2015        handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2016        if (IS_ERR(handle)) {
2017                error = PTR_ERR(handle);
2018                goto out_free;
2019        }
2020
2021        ext4_write_lock_xattr(inode, &no_expand);
2022        if (ext4_has_inline_data(inode))
2023                error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2024        ext4_write_unlock_xattr(inode, &no_expand);
2025        ext4_journal_stop(handle);
2026out_free:
2027        brelse(iloc.bh);
2028        return error;
2029}
2030