Pileus Git - ~andy/linux/blob - fs/ext4/inline.c

   1 /*
   2  * Copyright (c) 2012 Taobao.
   3  * Written by Tao Ma <boyu.mt@taobao.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include "ext4_jbd2.h"
  15 #include "ext4.h"
  16 #include "xattr.h"
  17 #include "truncate.h"
  18 #include <linux/fiemap.h>
  19
  20 #define EXT4_XATTR_SYSTEM_DATA  "data"
  21 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  22 #define EXT4_INLINE_DOTDOT_OFFSET       2
  23 #define EXT4_INLINE_DOTDOT_SIZE         4
  24
  25 int ext4_get_inline_size(struct inode *inode)
  26 {
  27         if (EXT4_I(inode)->i_inline_off)
  28                 return EXT4_I(inode)->i_inline_size;
  29
  30         return 0;
  31 }
  32
  33 static int get_max_inline_xattr_value_size(struct inode *inode,
  34                                            struct ext4_iloc *iloc)
  35 {
  36         struct ext4_xattr_ibody_header *header;
  37         struct ext4_xattr_entry *entry;
  38         struct ext4_inode *raw_inode;
  39         int free, min_offs;
  40
  41         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  42                         EXT4_GOOD_OLD_INODE_SIZE -
  43                         EXT4_I(inode)->i_extra_isize -
  44                         sizeof(struct ext4_xattr_ibody_header);
  45
  46         /*
  47          * We need to subtract another sizeof(__u32) since an in-inode xattr
  48          * needs an empty 4 bytes to indicate the gap between the xattr entry
  49          * and the name/value pair.
  50          */
  51         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  52                 return EXT4_XATTR_SIZE(min_offs -
  53                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  54                         EXT4_XATTR_ROUND - sizeof(__u32));
  55
  56         raw_inode = ext4_raw_inode(iloc);
  57         header = IHDR(inode, raw_inode);
  58         entry = IFIRST(header);
  59
  60         /* Compute min_offs. */
  61         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  62                 if (!entry->e_value_block && entry->e_value_size) {
  63                         size_t offs = le16_to_cpu(entry->e_value_offs);
  64                         if (offs < min_offs)
  65                                 min_offs = offs;
  66                 }
  67         }
  68         free = min_offs -
  69                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  70
  71         if (EXT4_I(inode)->i_inline_off) {
  72                 entry = (struct ext4_xattr_entry *)
  73                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  74
  75                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  76                 goto out;
  77         }
  78
  79         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  80
  81         if (free > EXT4_XATTR_ROUND)
  82                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  83         else
  84                 free = 0;
  85
  86 out:
  87         return free;
  88 }
  89
  90 /*
  91  * Get the maximum size we now can store in an inode.
  92  * If we can't find the space for a xattr entry, don't use the space
  93  * of the extents since we have no space to indicate the inline data.
  94  */
  95 int ext4_get_max_inline_size(struct inode *inode)
  96 {
  97         int error, max_inline_size;
  98         struct ext4_iloc iloc;
  99
 100         if (EXT4_I(inode)->i_extra_isize == 0)
 101                 return 0;
 102
 103         error = ext4_get_inode_loc(inode, &iloc);
 104         if (error) {
 105                 ext4_error_inode(inode, __func__, __LINE__, 0,
 106                                  "can't get inode location %lu",
 107                                  inode->i_ino);
 108                 return 0;
 109         }
 110
 111         down_read(&EXT4_I(inode)->xattr_sem);
 112         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 113         up_read(&EXT4_I(inode)->xattr_sem);
 114
 115         brelse(iloc.bh);
 116
 117         if (!max_inline_size)
 118                 return 0;
 119
 120         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 121 }
 122
 123 int ext4_has_inline_data(struct inode *inode)
 124 {
 125         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
 126                EXT4_I(inode)->i_inline_off;
 127 }
 128
 129 /*
 130  * this function does not take xattr_sem, which is OK because it is
 131  * currently only used in a code path coming form ext4_iget, before
 132  * the new inode has been unlocked
 133  */
 134 int ext4_find_inline_data_nolock(struct inode *inode)
 135 {
 136         struct ext4_xattr_ibody_find is = {
 137                 .s = { .not_found = -ENODATA, },
 138         };
 139         struct ext4_xattr_info i = {
 140                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 141                 .name = EXT4_XATTR_SYSTEM_DATA,
 142         };
 143         int error;
 144
 145         if (EXT4_I(inode)->i_extra_isize == 0)
 146                 return 0;
 147
 148         error = ext4_get_inode_loc(inode, &is.iloc);
 149         if (error)
 150                 return error;
 151
 152         error = ext4_xattr_ibody_find(inode, &i, &is);
 153         if (error)
 154                 goto out;
 155
 156         if (!is.s.not_found) {
 157                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 158                                         (void *)ext4_raw_inode(&is.iloc));
 159                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 160                                 le32_to_cpu(is.s.here->e_value_size);
 161                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 162         }
 163 out:
 164         brelse(is.iloc.bh);
 165         return error;
 166 }
 167
 168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 169                                  unsigned int len,
 170                                  struct ext4_iloc *iloc)
 171 {
 172         struct ext4_xattr_entry *entry;
 173         struct ext4_xattr_ibody_header *header;
 174         int cp_len = 0;
 175         struct ext4_inode *raw_inode;
 176
 177         if (!len)
 178                 return 0;
 179
 180         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 181
 182         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 183                         len : EXT4_MIN_INLINE_DATA_SIZE;
 184
 185         raw_inode = ext4_raw_inode(iloc);
 186         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 187
 188         len -= cp_len;
 189         buffer += cp_len;
 190
 191         if (!len)
 192                 goto out;
 193
 194         header = IHDR(inode, raw_inode);
 195         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 196                                             EXT4_I(inode)->i_inline_off);
 197         len = min_t(unsigned int, len,
 198                     (unsigned int)le32_to_cpu(entry->e_value_size));
 199
 200         memcpy(buffer,
 201                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 202         cp_len += len;
 203
 204 out:
 205         return cp_len;
 206 }
 207
 208 /*
 209  * write the buffer to the inline inode.
 210  * If 'create' is set, we don't need to do the extra copy in the xattr
 211  * value since it is already handled by ext4_xattr_ibody_inline_set.
 212  * That saves us one memcpy.
 213  */
 214 void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 215                             void *buffer, loff_t pos, unsigned int len)
 216 {
 217         struct ext4_xattr_entry *entry;
 218         struct ext4_xattr_ibody_header *header;
 219         struct ext4_inode *raw_inode;
 220         int cp_len = 0;
 221
 222         BUG_ON(!EXT4_I(inode)->i_inline_off);
 223         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 224
 225         raw_inode = ext4_raw_inode(iloc);
 226         buffer += pos;
 227
 228         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 229                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 230                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 231                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 232
 233                 len -= cp_len;
 234                 buffer += cp_len;
 235                 pos += cp_len;
 236         }
 237
 238         if (!len)
 239                 return;
 240
 241         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 242         header = IHDR(inode, raw_inode);
 243         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 244                                             EXT4_I(inode)->i_inline_off);
 245
 246         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 247                buffer, len);
 248 }
 249
 250 static int ext4_create_inline_data(handle_t *handle,
 251                                    struct inode *inode, unsigned len)
 252 {
 253         int error;
 254         void *value = NULL;
 255         struct ext4_xattr_ibody_find is = {
 256                 .s = { .not_found = -ENODATA, },
 257         };
 258         struct ext4_xattr_info i = {
 259                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 260                 .name = EXT4_XATTR_SYSTEM_DATA,
 261         };
 262
 263         error = ext4_get_inode_loc(inode, &is.iloc);
 264         if (error)
 265                 return error;
 266
 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
 308 out:
 309         brelse(is.iloc.bh);
 310         return error;
 311 }
 312
 313 static 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                 goto out;
 344
 345         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 346                                      value, len);
 347         if (error == -ENODATA)
 348                 goto out;
 349
 350         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 351         if (error)
 352                 goto out;
 353
 354         /* Update the xttr entry. */
 355         i.value = value;
 356         i.value_len = len;
 357
 358         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 359         if (error)
 360                 goto out;
 361
 362         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 363                                       (void *)ext4_raw_inode(&is.iloc));
 364         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 365                                 le32_to_cpu(is.s.here->e_value_size);
 366         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 367         get_bh(is.iloc.bh);
 368         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 369
 370 out:
 371         kfree(value);
 372         brelse(is.iloc.bh);
 373         return error;
 374 }
 375
 376 int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 377                              unsigned int len)
 378 {
 379         int ret, size;
 380         struct ext4_inode_info *ei = EXT4_I(inode);
 381
 382         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 383                 return -ENOSPC;
 384
 385         size = ext4_get_max_inline_size(inode);
 386         if (size < len)
 387                 return -ENOSPC;
 388
 389         down_write(&EXT4_I(inode)->xattr_sem);
 390
 391         if (ei->i_inline_off)
 392                 ret = ext4_update_inline_data(handle, inode, len);
 393         else
 394                 ret = ext4_create_inline_data(handle, inode, len);
 395
 396         up_write(&EXT4_I(inode)->xattr_sem);
 397
 398         return ret;
 399 }
 400
 401 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 402                                            struct inode *inode)
 403 {
 404         struct ext4_inode_info *ei = EXT4_I(inode);
 405         struct ext4_xattr_ibody_find is = {
 406                 .s = { .not_found = 0, },
 407         };
 408         struct ext4_xattr_info i = {
 409                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 410                 .name = EXT4_XATTR_SYSTEM_DATA,
 411                 .value = NULL,
 412                 .value_len = 0,
 413         };
 414         int error;
 415
 416         if (!ei->i_inline_off)
 417                 return 0;
 418
 419         error = ext4_get_inode_loc(inode, &is.iloc);
 420         if (error)
 421                 return error;
 422
 423         error = ext4_xattr_ibody_find(inode, &i, &is);
 424         if (error)
 425                 goto out;
 426
 427         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 428         if (error)
 429                 goto out;
 430
 431         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 432         if (error)
 433                 goto out;
 434
 435         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 436                 0, EXT4_MIN_INLINE_DATA_SIZE);
 437
 438         if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
 439                                       EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 440                 if (S_ISDIR(inode->i_mode) ||
 441                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 442                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 443                         ext4_ext_tree_init(handle, inode);
 444                 }
 445         }
 446         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 447
 448         get_bh(is.iloc.bh);
 449         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 450
 451         EXT4_I(inode)->i_inline_off = 0;
 452         EXT4_I(inode)->i_inline_size = 0;
 453         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 454 out:
 455         brelse(is.iloc.bh);
 456         if (error == -ENODATA)
 457                 error = 0;
 458         return error;
 459 }
 460
 461 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 462 {
 463         void *kaddr;
 464         int ret = 0;
 465         size_t len;
 466         struct ext4_iloc iloc;
 467
 468         BUG_ON(!PageLocked(page));
 469         BUG_ON(!ext4_has_inline_data(inode));
 470         BUG_ON(page->index);
 471
 472         if (!EXT4_I(inode)->i_inline_off) {
 473                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 474                              inode->i_ino);
 475                 goto out;
 476         }
 477
 478         ret = ext4_get_inode_loc(inode, &iloc);
 479         if (ret)
 480                 goto out;
 481
 482         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 483         kaddr = kmap_atomic(page);
 484         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 485         flush_dcache_page(page);
 486         kunmap_atomic(kaddr);
 487         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 488         SetPageUptodate(page);
 489         brelse(iloc.bh);
 490
 491 out:
 492         return ret;
 493 }
 494
 495 int ext4_readpage_inline(struct inode *inode, struct page *page)
 496 {
 497         int ret = 0;
 498
 499         down_read(&EXT4_I(inode)->xattr_sem);
 500         if (!ext4_has_inline_data(inode)) {
 501                 up_read(&EXT4_I(inode)->xattr_sem);
 502                 return -EAGAIN;
 503         }
 504
 505         /*
 506          * Current inline data can only exist in the 1st page,
 507          * So for all the other pages, just set them uptodate.
 508          */
 509         if (!page->index)
 510                 ret = ext4_read_inline_page(inode, page);
 511         else if (!PageUptodate(page)) {
 512                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 513                 SetPageUptodate(page);
 514         }
 515
 516         up_read(&EXT4_I(inode)->xattr_sem);
 517
 518         unlock_page(page);
 519         return ret >= 0 ? 0 : ret;
 520 }
 521
 522 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 523                                               struct inode *inode,
 524                                               unsigned flags)
 525 {
 526         int ret, needed_blocks;
 527         handle_t *handle = NULL;
 528         int retries = 0, sem_held = 0;
 529         struct page *page = NULL;
 530         unsigned from, to;
 531         struct ext4_iloc iloc;
 532
 533         if (!ext4_has_inline_data(inode)) {
 534                 /*
 535                  * clear the flag so that no new write
 536                  * will trap here again.
 537                  */
 538                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 539                 return 0;
 540         }
 541
 542         needed_blocks = ext4_writepage_trans_blocks(inode);
 543
 544         ret = ext4_get_inode_loc(inode, &iloc);
 545         if (ret)
 546                 return ret;
 547
 548 retry:
 549         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 550         if (IS_ERR(handle)) {
 551                 ret = PTR_ERR(handle);
 552                 handle = NULL;
 553                 goto out;
 554         }
 555
 556         /* We cannot recurse into the filesystem as the transaction is already
 557          * started */
 558         flags |= AOP_FLAG_NOFS;
 559
 560         page = grab_cache_page_write_begin(mapping, 0, flags);
 561         if (!page) {
 562                 ret = -ENOMEM;
 563                 goto out;
 564         }
 565
 566         down_write(&EXT4_I(inode)->xattr_sem);
 567         sem_held = 1;
 568         /* If some one has already done this for us, just exit. */
 569         if (!ext4_has_inline_data(inode)) {
 570                 ret = 0;
 571                 goto out;
 572         }
 573
 574         from = 0;
 575         to = ext4_get_inline_size(inode);
 576         if (!PageUptodate(page)) {
 577                 ret = ext4_read_inline_page(inode, page);
 578                 if (ret < 0)
 579                         goto out;
 580         }
 581
 582         ret = ext4_destroy_inline_data_nolock(handle, inode);
 583         if (ret)
 584                 goto out;
 585
 586         if (ext4_should_dioread_nolock(inode))
 587                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 588         else
 589                 ret = __block_write_begin(page, from, to, ext4_get_block);
 590
 591         if (!ret && ext4_should_journal_data(inode)) {
 592                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 593                                              from, to, NULL,
 594                                              do_journal_get_write_access);
 595         }
 596
 597         if (ret) {
 598                 unlock_page(page);
 599                 page_cache_release(page);
 600                 ext4_orphan_add(handle, inode);
 601                 up_write(&EXT4_I(inode)->xattr_sem);
 602                 sem_held = 0;
 603                 ext4_journal_stop(handle);
 604                 handle = NULL;
 605                 ext4_truncate_failed_write(inode);
 606                 /*
 607                  * If truncate failed early the inode might
 608                  * still be on the orphan list; we need to
 609                  * make sure the inode is removed from the
 610                  * orphan list in that case.
 611                  */
 612                 if (inode->i_nlink)
 613                         ext4_orphan_del(NULL, inode);
 614         }
 615
 616         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 617                 goto retry;
 618
 619         block_commit_write(page, from, to);
 620 out:
 621         if (page) {
 622                 unlock_page(page);
 623                 page_cache_release(page);
 624         }
 625         if (sem_held)
 626                 up_write(&EXT4_I(inode)->xattr_sem);
 627         if (handle)
 628                 ext4_journal_stop(handle);
 629         brelse(iloc.bh);
 630         return ret;
 631 }
 632
 633 /*
 634  * Try to write data in the inode.
 635  * If the inode has inline data, check whether the new write can be
 636  * in the inode also. If not, create the page the handle, move the data
 637  * to the page make it update and let the later codes create extent for it.
 638  */
 639 int ext4_try_to_write_inline_data(struct address_space *mapping,
 640                                   struct inode *inode,
 641                                   loff_t pos, unsigned len,
 642                                   unsigned flags,
 643                                   struct page **pagep)
 644 {
 645         int ret;
 646         handle_t *handle;
 647         struct page *page;
 648         struct ext4_iloc iloc;
 649
 650         if (pos + len > ext4_get_max_inline_size(inode))
 651                 goto convert;
 652
 653         ret = ext4_get_inode_loc(inode, &iloc);
 654         if (ret)
 655                 return ret;
 656
 657         /*
 658          * The possible write could happen in the inode,
 659          * so try to reserve the space in inode first.
 660          */
 661         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 662         if (IS_ERR(handle)) {
 663                 ret = PTR_ERR(handle);
 664                 handle = NULL;
 665                 goto out;
 666         }
 667
 668         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 669         if (ret && ret != -ENOSPC)
 670                 goto out;
 671
 672         /* We don't have space in inline inode, so convert it to extent. */
 673         if (ret == -ENOSPC) {
 674                 ext4_journal_stop(handle);
 675                 brelse(iloc.bh);
 676                 goto convert;
 677         }
 678
 679         flags |= AOP_FLAG_NOFS;
 680
 681         page = grab_cache_page_write_begin(mapping, 0, flags);
 682         if (!page) {
 683                 ret = -ENOMEM;
 684                 goto out;
 685         }
 686
 687         *pagep = page;
 688         down_read(&EXT4_I(inode)->xattr_sem);
 689         if (!ext4_has_inline_data(inode)) {
 690                 ret = 0;
 691                 unlock_page(page);
 692                 page_cache_release(page);
 693                 goto out_up_read;
 694         }
 695
 696         if (!PageUptodate(page)) {
 697                 ret = ext4_read_inline_page(inode, page);
 698                 if (ret < 0)
 699                         goto out_up_read;
 700         }
 701
 702         ret = 1;
 703         handle = NULL;
 704 out_up_read:
 705         up_read(&EXT4_I(inode)->xattr_sem);
 706 out:
 707         if (handle)
 708                 ext4_journal_stop(handle);
 709         brelse(iloc.bh);
 710         return ret;
 711 convert:
 712         return ext4_convert_inline_data_to_extent(mapping,
 713                                                   inode, flags);
 714 }
 715
 716 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 717                                unsigned copied, struct page *page)
 718 {
 719         int ret;
 720         void *kaddr;
 721         struct ext4_iloc iloc;
 722
 723         if (unlikely(copied < len)) {
 724                 if (!PageUptodate(page)) {
 725                         copied = 0;
 726                         goto out;
 727                 }
 728         }
 729
 730         ret = ext4_get_inode_loc(inode, &iloc);
 731         if (ret) {
 732                 ext4_std_error(inode->i_sb, ret);
 733                 copied = 0;
 734                 goto out;
 735         }
 736
 737         down_write(&EXT4_I(inode)->xattr_sem);
 738         BUG_ON(!ext4_has_inline_data(inode));
 739
 740         kaddr = kmap_atomic(page);
 741         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 742         kunmap_atomic(kaddr);
 743         SetPageUptodate(page);
 744         /* clear page dirty so that writepages wouldn't work for us. */
 745         ClearPageDirty(page);
 746
 747         up_write(&EXT4_I(inode)->xattr_sem);
 748         brelse(iloc.bh);
 749 out:
 750         return copied;
 751 }
 752
 753 struct buffer_head *
 754 ext4_journalled_write_inline_data(struct inode *inode,
 755                                   unsigned len,
 756                                   struct page *page)
 757 {
 758         int ret;
 759         void *kaddr;
 760         struct ext4_iloc iloc;
 761
 762         ret = ext4_get_inode_loc(inode, &iloc);
 763         if (ret) {
 764                 ext4_std_error(inode->i_sb, ret);
 765                 return NULL;
 766         }
 767
 768         down_write(&EXT4_I(inode)->xattr_sem);
 769         kaddr = kmap_atomic(page);
 770         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 771         kunmap_atomic(kaddr);
 772         up_write(&EXT4_I(inode)->xattr_sem);
 773
 774         return iloc.bh;
 775 }
 776
 777 /*
 778  * Try to make the page cache and handle ready for the inline data case.
 779  * We can call this function in 2 cases:
 780  * 1. The inode is created and the first write exceeds inline size. We can
 781  *    clear the inode state safely.
 782  * 2. The inode has inline data, then we need to read the data, make it
 783  *    update and dirty so that ext4_da_writepages can handle it. We don't
 784  *    need to start the journal since the file's metatdata isn't changed now.
 785  */
 786 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 787                                                  struct inode *inode,
 788                                                  unsigned flags,
 789                                                  void **fsdata)
 790 {
 791         int ret = 0, inline_size;
 792         struct page *page;
 793
 794         page = grab_cache_page_write_begin(mapping, 0, flags);
 795         if (!page)
 796                 return -ENOMEM;
 797
 798         down_read(&EXT4_I(inode)->xattr_sem);
 799         if (!ext4_has_inline_data(inode)) {
 800                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 801                 goto out;
 802         }
 803
 804         inline_size = ext4_get_inline_size(inode);
 805
 806         if (!PageUptodate(page)) {
 807                 ret = ext4_read_inline_page(inode, page);
 808                 if (ret < 0)
 809                         goto out;
 810         }
 811
 812         ret = __block_write_begin(page, 0, inline_size,
 813                                   ext4_da_get_block_prep);
 814         if (ret) {
 815                 ext4_truncate_failed_write(inode);
 816                 goto out;
 817         }
 818
 819         SetPageDirty(page);
 820         SetPageUptodate(page);
 821         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 822         *fsdata = (void *)CONVERT_INLINE_DATA;
 823
 824 out:
 825         up_read(&EXT4_I(inode)->xattr_sem);
 826         if (page) {
 827                 unlock_page(page);
 828                 page_cache_release(page);
 829         }
 830         return ret;
 831 }
 832
 833 /*
 834  * Prepare the write for the inline data.
 835  * If the the data can be written into the inode, we just read
 836  * the page and make it uptodate, and start the journal.
 837  * Otherwise read the page, makes it dirty so that it can be
 838  * handle in writepages(the i_disksize update is left to the
 839  * normal ext4_da_write_end).
 840  */
 841 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 842                                     struct inode *inode,
 843                                     loff_t pos, unsigned len,
 844                                     unsigned flags,
 845                                     struct page **pagep,
 846                                     void **fsdata)
 847 {
 848         int ret, inline_size;
 849         handle_t *handle;
 850         struct page *page;
 851         struct ext4_iloc iloc;
 852         int retries;
 853
 854         ret = ext4_get_inode_loc(inode, &iloc);
 855         if (ret)
 856                 return ret;
 857
 858 retry_journal:
 859         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 860         if (IS_ERR(handle)) {
 861                 ret = PTR_ERR(handle);
 862                 handle = NULL;
 863                 goto out;
 864         }
 865
 866         inline_size = ext4_get_max_inline_size(inode);
 867
 868         ret = -ENOSPC;
 869         if (inline_size >= pos + len) {
 870                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 871                 if (ret && ret != -ENOSPC)
 872                         goto out;
 873         }
 874
 875         if (ret == -ENOSPC) {
 876                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 877                                                             inode,
 878                                                             flags,
 879                                                             fsdata);
 880                 ext4_journal_stop(handle);
 881                 handle = NULL;
 882                 if (ret == -ENOSPC &&
 883                     ext4_should_retry_alloc(inode->i_sb, &retries))
 884                         goto retry_journal;
 885                 goto out;
 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         page = grab_cache_page_write_begin(mapping, 0, flags);
 895         if (!page) {
 896                 ret = -ENOMEM;
 897                 goto out;
 898         }
 899
 900         down_read(&EXT4_I(inode)->xattr_sem);
 901         if (!ext4_has_inline_data(inode)) {
 902                 ret = 0;
 903                 goto out_release_page;
 904         }
 905
 906         if (!PageUptodate(page)) {
 907                 ret = ext4_read_inline_page(inode, page);
 908                 if (ret < 0)
 909                         goto out_release_page;
 910         }
 911
 912         up_read(&EXT4_I(inode)->xattr_sem);
 913         *pagep = page;
 914         handle = NULL;
 915         brelse(iloc.bh);
 916         return 1;
 917 out_release_page:
 918         up_read(&EXT4_I(inode)->xattr_sem);
 919         unlock_page(page);
 920         page_cache_release(page);
 921 out:
 922         if (handle)
 923                 ext4_journal_stop(handle);
 924         brelse(iloc.bh);
 925         return ret;
 926 }
 927
 928 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 929                                   unsigned len, unsigned copied,
 930                                   struct page *page)
 931 {
 932         int i_size_changed = 0;
 933
 934         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 935
 936         /*
 937          * No need to use i_size_read() here, the i_size
 938          * cannot change under us because we hold i_mutex.
 939          *
 940          * But it's important to update i_size while still holding page lock:
 941          * page writeout could otherwise come in and zero beyond i_size.
 942          */
 943         if (pos+copied > inode->i_size) {
 944                 i_size_write(inode, pos+copied);
 945                 i_size_changed = 1;
 946         }
 947         unlock_page(page);
 948         page_cache_release(page);
 949
 950         /*
 951          * Don't mark the inode dirty under page lock. First, it unnecessarily
 952          * makes the holding time of page lock longer. Second, it forces lock
 953          * ordering of page lock and transaction start for journaling
 954          * filesystems.
 955          */
 956         if (i_size_changed)
 957                 mark_inode_dirty(inode);
 958
 959         return copied;
 960 }
 961
 962 #ifdef INLINE_DIR_DEBUG
 963 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 964                           void *inline_start, int inline_size)
 965 {
 966         int offset;
 967         unsigned short de_len;
 968         struct ext4_dir_entry_2 *de = inline_start;
 969         void *dlimit = inline_start + inline_size;
 970
 971         trace_printk("inode %lu\n", dir->i_ino);
 972         offset = 0;
 973         while ((void *)de < dlimit) {
 974                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 975                 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
 976                              offset, de_len, de->name_len, de->name,
 977                              de->name_len, le32_to_cpu(de->inode));
 978                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 979                                          inline_start, inline_size, offset))
 980                         BUG();
 981
 982                 offset += de_len;
 983                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 984         }
 985 }
 986 #else
 987 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 988 #endif
 989
 990 /*
 991  * Add a new entry into a inline dir.
 992  * It will return -ENOSPC if no space is available, and -EIO
 993  * and -EEXIST if directory entry already exists.
 994  */
 995 static int ext4_add_dirent_to_inline(handle_t *handle,
 996                                      struct dentry *dentry,
 997                                      struct inode *inode,
 998                                      struct ext4_iloc *iloc,
 999                                      void *inline_start, int inline_size)
1000 {
1001         struct inode    *dir = dentry->d_parent->d_inode;
1002         const char      *name = dentry->d_name.name;
1003         int             namelen = dentry->d_name.len;
1004         int             err;
1005         struct ext4_dir_entry_2 *de;
1006
1007         err = ext4_find_dest_de(dir, inode, iloc->bh,
1008                                 inline_start, inline_size,
1009                                 name, namelen, &de);
1010         if (err)
1011                 return err;
1012
1013         err = ext4_journal_get_write_access(handle, iloc->bh);
1014         if (err)
1015                 return err;
1016         ext4_insert_dentry(inode, de, inline_size, name, namelen);
1017
1018         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1019
1020         /*
1021          * XXX shouldn't update any times until successful
1022          * completion of syscall, but too many callers depend
1023          * on this.
1024          *
1025          * XXX similarly, too many callers depend on
1026          * ext4_new_inode() setting the times, but error
1027          * recovery deletes the inode, so the worst that can
1028          * happen is that the times are slightly out of date
1029          * and/or different from the directory change time.
1030          */
1031         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1032         ext4_update_dx_flag(dir);
1033         dir->i_version++;
1034         ext4_mark_inode_dirty(handle, dir);
1035         return 1;
1036 }
1037
1038 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1039                                        struct ext4_iloc *iloc)
1040 {
1041         struct ext4_xattr_entry *entry;
1042         struct ext4_xattr_ibody_header *header;
1043
1044         BUG_ON(!EXT4_I(inode)->i_inline_off);
1045
1046         header = IHDR(inode, ext4_raw_inode(iloc));
1047         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1048                                             EXT4_I(inode)->i_inline_off);
1049
1050         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1051 }
1052
1053 /* Set the final de to cover the whole block. */
1054 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1055 {
1056         struct ext4_dir_entry_2 *de, *prev_de;
1057         void *limit;
1058         int de_len;
1059
1060         de = (struct ext4_dir_entry_2 *)de_buf;
1061         if (old_size) {
1062                 limit = de_buf + old_size;
1063                 do {
1064                         prev_de = de;
1065                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1066                         de_buf += de_len;
1067                         de = (struct ext4_dir_entry_2 *)de_buf;
1068                 } while (de_buf < limit);
1069
1070                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1071                                                         old_size, new_size);
1072         } else {
1073                 /* this is just created, so create an empty entry. */
1074                 de->inode = 0;
1075                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1076         }
1077 }
1078
1079 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1080                                   struct ext4_iloc *iloc)
1081 {
1082         int ret;
1083         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1084         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1085
1086         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1087                 return -ENOSPC;
1088
1089         ret = ext4_update_inline_data(handle, dir,
1090                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1091         if (ret)
1092                 return ret;
1093
1094         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1095                              EXT4_I(dir)->i_inline_size -
1096                                                 EXT4_MIN_INLINE_DATA_SIZE);
1097         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1098         return 0;
1099 }
1100
1101 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1102                                      struct ext4_iloc *iloc,
1103                                      void *buf, int inline_size)
1104 {
1105         ext4_create_inline_data(handle, inode, inline_size);
1106         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1107         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1108 }
1109
1110 static int ext4_finish_convert_inline_dir(handle_t *handle,
1111                                           struct inode *inode,
1112                                           struct buffer_head *dir_block,
1113                                           void *buf,
1114                                           int inline_size)
1115 {
1116         int err, csum_size = 0, header_size = 0;
1117         struct ext4_dir_entry_2 *de;
1118         struct ext4_dir_entry_tail *t;
1119         void *target = dir_block->b_data;
1120
1121         /*
1122          * First create "." and ".." and then copy the dir information
1123          * back to the block.
1124          */
1125         de = (struct ext4_dir_entry_2 *)target;
1126         de = ext4_init_dot_dotdot(inode, de,
1127                 inode->i_sb->s_blocksize, csum_size,
1128                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1129         header_size = (void *)de - target;
1130
1131         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1132                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1133
1134         if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1135                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1136                 csum_size = sizeof(struct ext4_dir_entry_tail);
1137
1138         inode->i_size = inode->i_sb->s_blocksize;
1139         i_size_write(inode, inode->i_sb->s_blocksize);
1140         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1141         ext4_update_final_de(dir_block->b_data,
1142                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1143                         inode->i_sb->s_blocksize - csum_size);
1144
1145         if (csum_size) {
1146                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1147                                      inode->i_sb->s_blocksize);
1148                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1149         }
1150         set_buffer_uptodate(dir_block);
1151         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1152         if (err)
1153                 goto out;
1154         set_buffer_verified(dir_block);
1155 out:
1156         return err;
1157 }
1158
1159 static int ext4_convert_inline_data_nolock(handle_t *handle,
1160                                            struct inode *inode,
1161                                            struct ext4_iloc *iloc)
1162 {
1163         int error;
1164         void *buf = NULL;
1165         struct buffer_head *data_bh = NULL;
1166         struct ext4_map_blocks map;
1167         int inline_size;
1168
1169         inline_size = ext4_get_inline_size(inode);
1170         buf = kmalloc(inline_size, GFP_NOFS);
1171         if (!buf) {
1172                 error = -ENOMEM;
1173                 goto out;
1174         }
1175
1176         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1177         if (error < 0)
1178                 goto out;
1179
1180         error = ext4_destroy_inline_data_nolock(handle, inode);
1181         if (error)
1182                 goto out;
1183
1184         map.m_lblk = 0;
1185         map.m_len = 1;
1186         map.m_flags = 0;
1187         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1188         if (error < 0)
1189                 goto out_restore;
1190         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1191                 error = -EIO;
1192                 goto out_restore;
1193         }
1194
1195         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1196         if (!data_bh) {
1197                 error = -ENOMEM;
1198                 goto out_restore;
1199         }
1200
1201         lock_buffer(data_bh);
1202         error = ext4_journal_get_create_access(handle, data_bh);
1203         if (error) {
1204                 unlock_buffer(data_bh);
1205                 error = -EIO;
1206                 goto out_restore;
1207         }
1208         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1209
1210         if (!S_ISDIR(inode->i_mode)) {
1211                 memcpy(data_bh->b_data, buf, inline_size);
1212                 set_buffer_uptodate(data_bh);
1213                 error = ext4_handle_dirty_metadata(handle,
1214                                                    inode, data_bh);
1215         } else {
1216                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1217                                                        buf, inline_size);
1218         }
1219
1220         unlock_buffer(data_bh);
1221 out_restore:
1222         if (error)
1223                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1224
1225 out:
1226         brelse(data_bh);
1227         kfree(buf);
1228         return error;
1229 }
1230
1231 /*
1232  * Try to add the new entry to the inline data.
1233  * If succeeds, return 0. If not, extended the inline dir and copied data to
1234  * the new created block.
1235  */
1236 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1237                               struct inode *inode)
1238 {
1239         int ret, inline_size;
1240         void *inline_start;
1241         struct ext4_iloc iloc;
1242         struct inode *dir = dentry->d_parent->d_inode;
1243
1244         ret = ext4_get_inode_loc(dir, &iloc);
1245         if (ret)
1246                 return ret;
1247
1248         down_write(&EXT4_I(dir)->xattr_sem);
1249         if (!ext4_has_inline_data(dir))
1250                 goto out;
1251
1252         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1253                                                  EXT4_INLINE_DOTDOT_SIZE;
1254         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1255
1256         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1257                                         inline_start, inline_size);
1258         if (ret != -ENOSPC)
1259                 goto out;
1260
1261         /* check whether it can be inserted to inline xattr space. */
1262         inline_size = EXT4_I(dir)->i_inline_size -
1263                         EXT4_MIN_INLINE_DATA_SIZE;
1264         if (!inline_size) {
1265                 /* Try to use the xattr space.*/
1266                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1267                 if (ret && ret != -ENOSPC)
1268                         goto out;
1269
1270                 inline_size = EXT4_I(dir)->i_inline_size -
1271                                 EXT4_MIN_INLINE_DATA_SIZE;
1272         }
1273
1274         if (inline_size) {
1275                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1276
1277                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1278                                                 inline_start, inline_size);
1279
1280                 if (ret != -ENOSPC)
1281                         goto out;
1282         }
1283
1284         /*
1285          * The inline space is filled up, so create a new block for it.
1286          * As the extent tree will be created, we have to save the inline
1287          * dir first.
1288          */
1289         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1290
1291 out:
1292         ext4_mark_inode_dirty(handle, dir);
1293         up_write(&EXT4_I(dir)->xattr_sem);
1294         brelse(iloc.bh);
1295         return ret;
1296 }
1297
1298 /*
1299  * This function fills a red-black tree with information from an
1300  * inlined dir.  It returns the number directory entries loaded
1301  * into the tree.  If there is an error it is returned in err.
1302  */
1303 int htree_inlinedir_to_tree(struct file *dir_file,
1304                             struct inode *dir, ext4_lblk_t block,
1305                             struct dx_hash_info *hinfo,
1306                             __u32 start_hash, __u32 start_minor_hash,
1307                             int *has_inline_data)
1308 {
1309         int err = 0, count = 0;
1310         unsigned int parent_ino;
1311         int pos;
1312         struct ext4_dir_entry_2 *de;
1313         struct inode *inode = file_inode(dir_file);
1314         int ret, inline_size = 0;
1315         struct ext4_iloc iloc;
1316         void *dir_buf = NULL;
1317         struct ext4_dir_entry_2 fake;
1318
1319         ret = ext4_get_inode_loc(inode, &iloc);
1320         if (ret)
1321                 return ret;
1322
1323         down_read(&EXT4_I(inode)->xattr_sem);
1324         if (!ext4_has_inline_data(inode)) {
1325                 up_read(&EXT4_I(inode)->xattr_sem);
1326                 *has_inline_data = 0;
1327                 goto out;
1328         }
1329
1330         inline_size = ext4_get_inline_size(inode);
1331         dir_buf = kmalloc(inline_size, GFP_NOFS);
1332         if (!dir_buf) {
1333                 ret = -ENOMEM;
1334                 up_read(&EXT4_I(inode)->xattr_sem);
1335                 goto out;
1336         }
1337
1338         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1339         up_read(&EXT4_I(inode)->xattr_sem);
1340         if (ret < 0)
1341                 goto out;
1342
1343         pos = 0;
1344         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1345         while (pos < inline_size) {
1346                 /*
1347                  * As inlined dir doesn't store any information about '.' and
1348                  * only the inode number of '..' is stored, we have to handle
1349                  * them differently.
1350                  */
1351                 if (pos == 0) {
1352                         fake.inode = cpu_to_le32(inode->i_ino);
1353                         fake.name_len = 1;
1354                         strcpy(fake.name, ".");
1355                         fake.rec_len = ext4_rec_len_to_disk(
1356                                                 EXT4_DIR_REC_LEN(fake.name_len),
1357                                                 inline_size);
1358                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1359                         de = &fake;
1360                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1361                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1362                         fake.inode = cpu_to_le32(parent_ino);
1363                         fake.name_len = 2;
1364                         strcpy(fake.name, "..");
1365                         fake.rec_len = ext4_rec_len_to_disk(
1366                                                 EXT4_DIR_REC_LEN(fake.name_len),
1367                                                 inline_size);
1368                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1369                         de = &fake;
1370                         pos = EXT4_INLINE_DOTDOT_SIZE;
1371                 } else {
1372                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1373                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1374                         if (ext4_check_dir_entry(inode, dir_file, de,
1375                                          iloc.bh, dir_buf,
1376                                          inline_size, pos)) {
1377                                 ret = count;
1378                                 goto out;
1379                         }
1380                 }
1381
1382                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1383                 if ((hinfo->hash < start_hash) ||
1384                     ((hinfo->hash == start_hash) &&
1385                      (hinfo->minor_hash < start_minor_hash)))
1386                         continue;
1387                 if (de->inode == 0)
1388                         continue;
1389                 err = ext4_htree_store_dirent(dir_file,
1390                                    hinfo->hash, hinfo->minor_hash, de);
1391                 if (err) {
1392                         count = err;
1393                         goto out;
1394                 }
1395                 count++;
1396         }
1397         ret = count;
1398 out:
1399         kfree(dir_buf);
1400         brelse(iloc.bh);
1401         return ret;
1402 }
1403
1404 /*
1405  * So this function is called when the volume is mkfsed with
1406  * dir_index disabled. In order to keep f_pos persistent
1407  * after we convert from an inlined dir to a blocked based,
1408  * we just pretend that we are a normal dir and return the
1409  * offset as if '.' and '..' really take place.
1410  *
1411  */
1412 int ext4_read_inline_dir(struct file *file,
1413                          struct dir_context *ctx,
1414                          int *has_inline_data)
1415 {
1416         unsigned int offset, parent_ino;
1417         int i;
1418         struct ext4_dir_entry_2 *de;
1419         struct super_block *sb;
1420         struct inode *inode = file_inode(file);
1421         int ret, inline_size = 0;
1422         struct ext4_iloc iloc;
1423         void *dir_buf = NULL;
1424         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1425
1426         ret = ext4_get_inode_loc(inode, &iloc);
1427         if (ret)
1428                 return ret;
1429
1430         down_read(&EXT4_I(inode)->xattr_sem);
1431         if (!ext4_has_inline_data(inode)) {
1432                 up_read(&EXT4_I(inode)->xattr_sem);
1433                 *has_inline_data = 0;
1434                 goto out;
1435         }
1436
1437         inline_size = ext4_get_inline_size(inode);
1438         dir_buf = kmalloc(inline_size, GFP_NOFS);
1439         if (!dir_buf) {
1440                 ret = -ENOMEM;
1441                 up_read(&EXT4_I(inode)->xattr_sem);
1442                 goto out;
1443         }
1444
1445         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1446         up_read(&EXT4_I(inode)->xattr_sem);
1447         if (ret < 0)
1448                 goto out;
1449
1450         ret = 0;
1451         sb = inode->i_sb;
1452         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1453         offset = ctx->pos;
1454
1455         /*
1456          * dotdot_offset and dotdot_size is the real offset and
1457          * size for ".." and "." if the dir is block based while
1458          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1459          * So we will use extra_offset and extra_size to indicate them
1460          * during the inline dir iteration.
1461          */
1462         dotdot_offset = EXT4_DIR_REC_LEN(1);
1463         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1464         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1465         extra_size = extra_offset + inline_size;
1466
1467         /*
1468          * If the version has changed since the last call to
1469          * readdir(2), then we might be pointing to an invalid
1470          * dirent right now.  Scan from the start of the inline
1471          * dir to make sure.
1472          */
1473         if (file->f_version != inode->i_version) {
1474                 for (i = 0; i < extra_size && i < offset;) {
1475                         /*
1476                          * "." is with offset 0 and
1477                          * ".." is dotdot_offset.
1478                          */
1479                         if (!i) {
1480                                 i = dotdot_offset;
1481                                 continue;
1482                         } else if (i == dotdot_offset) {
1483                                 i = dotdot_size;
1484                                 continue;
1485                         }
1486                         /* for other entry, the real offset in
1487                          * the buf has to be tuned accordingly.
1488                          */
1489                         de = (struct ext4_dir_entry_2 *)
1490                                 (dir_buf + i - extra_offset);
1491                         /* It's too expensive to do a full
1492                          * dirent test each time round this
1493                          * loop, but we do have to test at
1494                          * least that it is non-zero.  A
1495                          * failure will be detected in the
1496                          * dirent test below. */
1497                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1498                                 < EXT4_DIR_REC_LEN(1))
1499                                 break;
1500                         i += ext4_rec_len_from_disk(de->rec_len,
1501                                                     extra_size);
1502                 }
1503                 offset = i;
1504                 ctx->pos = offset;
1505                 file->f_version = inode->i_version;
1506         }
1507
1508         while (ctx->pos < extra_size) {
1509                 if (ctx->pos == 0) {
1510                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1511                                 goto out;
1512                         ctx->pos = dotdot_offset;
1513                         continue;
1514                 }
1515
1516                 if (ctx->pos == dotdot_offset) {
1517                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1518                                 goto out;
1519                         ctx->pos = dotdot_size;
1520                         continue;
1521                 }
1522
1523                 de = (struct ext4_dir_entry_2 *)
1524                         (dir_buf + ctx->pos - extra_offset);
1525                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1526                                          extra_size, ctx->pos))
1527                         goto out;
1528                 if (le32_to_cpu(de->inode)) {
1529                         if (!dir_emit(ctx, de->name, de->name_len,
1530                                       le32_to_cpu(de->inode),
1531                                       get_dtype(sb, de->file_type)))
1532                                 goto out;
1533                 }
1534                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1535         }
1536 out:
1537         kfree(dir_buf);
1538         brelse(iloc.bh);
1539         return ret;
1540 }
1541
1542 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1543                                         struct ext4_dir_entry_2 **parent_de,
1544                                         int *retval)
1545 {
1546         struct ext4_iloc iloc;
1547
1548         *retval = ext4_get_inode_loc(inode, &iloc);
1549         if (*retval)
1550                 return NULL;
1551
1552         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1553
1554         return iloc.bh;
1555 }
1556
1557 /*
1558  * Try to create the inline data for the new dir.
1559  * If it succeeds, return 0, otherwise return the error.
1560  * In case of ENOSPC, the caller should create the normal disk layout dir.
1561  */
1562 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1563                                struct inode *inode)
1564 {
1565         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1566         struct ext4_iloc iloc;
1567         struct ext4_dir_entry_2 *de;
1568
1569         ret = ext4_get_inode_loc(inode, &iloc);
1570         if (ret)
1571                 return ret;
1572
1573         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1574         if (ret)
1575                 goto out;
1576
1577         /*
1578          * For inline dir, we only save the inode information for the ".."
1579          * and create a fake dentry to cover the left space.
1580          */
1581         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1582         de->inode = cpu_to_le32(parent->i_ino);
1583         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1584         de->inode = 0;
1585         de->rec_len = ext4_rec_len_to_disk(
1586                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1587                                 inline_size);
1588         set_nlink(inode, 2);
1589         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1590 out:
1591         brelse(iloc.bh);
1592         return ret;
1593 }
1594
1595 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1596                                         const struct qstr *d_name,
1597                                         struct ext4_dir_entry_2 **res_dir,
1598                                         int *has_inline_data)
1599 {
1600         int ret;
1601         struct ext4_iloc iloc;
1602         void *inline_start;
1603         int inline_size;
1604
1605         if (ext4_get_inode_loc(dir, &iloc))
1606                 return NULL;
1607
1608         down_read(&EXT4_I(dir)->xattr_sem);
1609         if (!ext4_has_inline_data(dir)) {
1610                 *has_inline_data = 0;
1611                 goto out;
1612         }
1613
1614         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1615                                                 EXT4_INLINE_DOTDOT_SIZE;
1616         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1617         ret = search_dir(iloc.bh, inline_start, inline_size,
1618                          dir, d_name, 0, res_dir);
1619         if (ret == 1)
1620                 goto out_find;
1621         if (ret < 0)
1622                 goto out;
1623
1624         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1625                 goto out;
1626
1627         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1628         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1629
1630         ret = search_dir(iloc.bh, inline_start, inline_size,
1631                          dir, d_name, 0, res_dir);
1632         if (ret == 1)
1633                 goto out_find;
1634
1635 out:
1636         brelse(iloc.bh);
1637         iloc.bh = NULL;
1638 out_find:
1639         up_read(&EXT4_I(dir)->xattr_sem);
1640         return iloc.bh;
1641 }
1642
1643 int ext4_delete_inline_entry(handle_t *handle,
1644                              struct inode *dir,
1645                              struct ext4_dir_entry_2 *de_del,
1646                              struct buffer_head *bh,
1647                              int *has_inline_data)
1648 {
1649         int err, inline_size;
1650         struct ext4_iloc iloc;
1651         void *inline_start;
1652
1653         err = ext4_get_inode_loc(dir, &iloc);
1654         if (err)
1655                 return err;
1656
1657         down_write(&EXT4_I(dir)->xattr_sem);
1658         if (!ext4_has_inline_data(dir)) {
1659                 *has_inline_data = 0;
1660                 goto out;
1661         }
1662
1663         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1664                 EXT4_MIN_INLINE_DATA_SIZE) {
1665                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1666                                         EXT4_INLINE_DOTDOT_SIZE;
1667                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1668                                 EXT4_INLINE_DOTDOT_SIZE;
1669         } else {
1670                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1671                 inline_size = ext4_get_inline_size(dir) -
1672                                 EXT4_MIN_INLINE_DATA_SIZE;
1673         }
1674
1675         err = ext4_journal_get_write_access(handle, bh);
1676         if (err)
1677                 goto out;
1678
1679         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1680                                         inline_start, inline_size, 0);
1681         if (err)
1682                 goto out;
1683
1684         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1685         err = ext4_mark_inode_dirty(handle, dir);
1686         if (unlikely(err))
1687                 goto out;
1688
1689         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1690 out:
1691         up_write(&EXT4_I(dir)->xattr_sem);
1692         brelse(iloc.bh);
1693         if (err != -ENOENT)
1694                 ext4_std_error(dir->i_sb, err);
1695         return err;
1696 }
1697
1698 /*
1699  * Get the inline dentry at offset.
1700  */
1701 static inline struct ext4_dir_entry_2 *
1702 ext4_get_inline_entry(struct inode *inode,
1703                       struct ext4_iloc *iloc,
1704                       unsigned int offset,
1705                       void **inline_start,
1706                       int *inline_size)
1707 {
1708         void *inline_pos;
1709
1710         BUG_ON(offset > ext4_get_inline_size(inode));
1711
1712         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1713                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1714                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1715         } else {
1716                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1717                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1718                 *inline_size = ext4_get_inline_size(inode) -
1719                                 EXT4_MIN_INLINE_DATA_SIZE;
1720         }
1721
1722         if (inline_start)
1723                 *inline_start = inline_pos;
1724         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1725 }
1726
1727 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1728 {
1729         int err, inline_size;
1730         struct ext4_iloc iloc;
1731         void *inline_pos;
1732         unsigned int offset;
1733         struct ext4_dir_entry_2 *de;
1734         int ret = 1;
1735
1736         err = ext4_get_inode_loc(dir, &iloc);
1737         if (err) {
1738                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1739                                  err, dir->i_ino);
1740                 return 1;
1741         }
1742
1743         down_read(&EXT4_I(dir)->xattr_sem);
1744         if (!ext4_has_inline_data(dir)) {
1745                 *has_inline_data = 0;
1746                 goto out;
1747         }
1748
1749         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1750         if (!le32_to_cpu(de->inode)) {
1751                 ext4_warning(dir->i_sb,
1752                              "bad inline directory (dir #%lu) - no `..'",
1753                              dir->i_ino);
1754                 ret = 1;
1755                 goto out;
1756         }
1757
1758         offset = EXT4_INLINE_DOTDOT_SIZE;
1759         while (offset < dir->i_size) {
1760                 de = ext4_get_inline_entry(dir, &iloc, offset,
1761                                            &inline_pos, &inline_size);
1762                 if (ext4_check_dir_entry(dir, NULL, de,
1763                                          iloc.bh, inline_pos,
1764                                          inline_size, offset)) {
1765                         ext4_warning(dir->i_sb,
1766                                      "bad inline directory (dir #%lu) - "
1767                                      "inode %u, rec_len %u, name_len %d"
1768                                      "inline size %d\n",
1769                                      dir->i_ino, le32_to_cpu(de->inode),
1770                                      le16_to_cpu(de->rec_len), de->name_len,
1771                                      inline_size);
1772                         ret = 1;
1773                         goto out;
1774                 }
1775                 if (le32_to_cpu(de->inode)) {
1776                         ret = 0;
1777                         goto out;
1778                 }
1779                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1780         }
1781
1782 out:
1783         up_read(&EXT4_I(dir)->xattr_sem);
1784         brelse(iloc.bh);
1785         return ret;
1786 }
1787
1788 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1789 {
1790         int ret;
1791
1792         down_write(&EXT4_I(inode)->xattr_sem);
1793         ret = ext4_destroy_inline_data_nolock(handle, inode);
1794         up_write(&EXT4_I(inode)->xattr_sem);
1795
1796         return ret;
1797 }
1798
1799 int ext4_inline_data_fiemap(struct inode *inode,
1800                             struct fiemap_extent_info *fieinfo,
1801                             int *has_inline)
1802 {
1803         __u64 physical = 0;
1804         __u64 length;
1805         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1806         int error = 0;
1807         struct ext4_iloc iloc;
1808
1809         down_read(&EXT4_I(inode)->xattr_sem);
1810         if (!ext4_has_inline_data(inode)) {
1811                 *has_inline = 0;
1812                 goto out;
1813         }
1814
1815         error = ext4_get_inode_loc(inode, &iloc);
1816         if (error)
1817                 goto out;
1818
1819         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1820         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1821         physical += offsetof(struct ext4_inode, i_block);
1822         length = i_size_read(inode);
1823
1824         if (physical)
1825                 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1826                                                 length, flags);
1827         brelse(iloc.bh);
1828 out:
1829         up_read(&EXT4_I(inode)->xattr_sem);
1830         return (error < 0 ? error : 0);
1831 }
1832
1833 /*
1834  * Called during xattr set, and if we can sparse space 'needed',
1835  * just create the extent tree evict the data to the outer block.
1836  *
1837  * We use jbd2 instead of page cache to move data to the 1st block
1838  * so that the whole transaction can be committed as a whole and
1839  * the data isn't lost because of the delayed page cache write.
1840  */
1841 int ext4_try_to_evict_inline_data(handle_t *handle,
1842                                   struct inode *inode,
1843                                   int needed)
1844 {
1845         int error;
1846         struct ext4_xattr_entry *entry;
1847         struct ext4_xattr_ibody_header *header;
1848         struct ext4_inode *raw_inode;
1849         struct ext4_iloc iloc;
1850
1851         error = ext4_get_inode_loc(inode, &iloc);
1852         if (error)
1853                 return error;
1854
1855         raw_inode = ext4_raw_inode(&iloc);
1856         header = IHDR(inode, raw_inode);
1857         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1858                                             EXT4_I(inode)->i_inline_off);
1859         if (EXT4_XATTR_LEN(entry->e_name_len) +
1860             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1861                 error = -ENOSPC;
1862                 goto out;
1863         }
1864
1865         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1866 out:
1867         brelse(iloc.bh);
1868         return error;
1869 }
1870
1871 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1872 {
1873         handle_t *handle;
1874         int inline_size, value_len, needed_blocks;
1875         size_t i_size;
1876         void *value = NULL;
1877         struct ext4_xattr_ibody_find is = {
1878                 .s = { .not_found = -ENODATA, },
1879         };
1880         struct ext4_xattr_info i = {
1881                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1882                 .name = EXT4_XATTR_SYSTEM_DATA,
1883         };
1884
1885
1886         needed_blocks = ext4_writepage_trans_blocks(inode);
1887         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1888         if (IS_ERR(handle))
1889                 return;
1890
1891         down_write(&EXT4_I(inode)->xattr_sem);
1892         if (!ext4_has_inline_data(inode)) {
1893                 *has_inline = 0;
1894                 ext4_journal_stop(handle);
1895                 return;
1896         }
1897
1898         if (ext4_orphan_add(handle, inode))
1899                 goto out;
1900
1901         if (ext4_get_inode_loc(inode, &is.iloc))
1902                 goto out;
1903
1904         down_write(&EXT4_I(inode)->i_data_sem);
1905         i_size = inode->i_size;
1906         inline_size = ext4_get_inline_size(inode);
1907         EXT4_I(inode)->i_disksize = i_size;
1908
1909         if (i_size < inline_size) {
1910                 /* Clear the content in the xattr space. */
1911                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1912                         if (ext4_xattr_ibody_find(inode, &i, &is))
1913                                 goto out_error;
1914
1915                         BUG_ON(is.s.not_found);
1916
1917                         value_len = le32_to_cpu(is.s.here->e_value_size);
1918                         value = kmalloc(value_len, GFP_NOFS);
1919                         if (!value)
1920                                 goto out_error;
1921
1922                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1923                                                 value, value_len))
1924                                 goto out_error;
1925
1926                         i.value = value;
1927                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1928                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1929                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1930                                 goto out_error;
1931                 }
1932
1933                 /* Clear the content within i_blocks. */
1934                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE)
1935                         memset(ext4_raw_inode(&is.iloc)->i_block + i_size, 0,
1936                                         EXT4_MIN_INLINE_DATA_SIZE - i_size);
1937
1938                 EXT4_I(inode)->i_inline_size = i_size <
1939                                         EXT4_MIN_INLINE_DATA_SIZE ?
1940                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1941         }
1942
1943 out_error:
1944         up_write(&EXT4_I(inode)->i_data_sem);
1945 out:
1946         brelse(is.iloc.bh);
1947         up_write(&EXT4_I(inode)->xattr_sem);
1948         kfree(value);
1949         if (inode->i_nlink)
1950                 ext4_orphan_del(handle, inode);
1951
1952         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1953         ext4_mark_inode_dirty(handle, inode);
1954         if (IS_SYNC(inode))
1955                 ext4_handle_sync(handle);
1956
1957         ext4_journal_stop(handle);
1958         return;
1959 }
1960
1961 int ext4_convert_inline_data(struct inode *inode)
1962 {
1963         int error, needed_blocks;
1964         handle_t *handle;
1965         struct ext4_iloc iloc;
1966
1967         if (!ext4_has_inline_data(inode)) {
1968                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1969                 return 0;
1970         }
1971
1972         needed_blocks = ext4_writepage_trans_blocks(inode);
1973
1974         iloc.bh = NULL;
1975         error = ext4_get_inode_loc(inode, &iloc);
1976         if (error)
1977                 return error;
1978
1979         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1980         if (IS_ERR(handle)) {
1981                 error = PTR_ERR(handle);
1982                 goto out_free;
1983         }
1984
1985         down_write(&EXT4_I(inode)->xattr_sem);
1986         if (!ext4_has_inline_data(inode)) {
1987                 up_write(&EXT4_I(inode)->xattr_sem);
1988                 goto out;
1989         }
1990
1991         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1992         up_write(&EXT4_I(inode)->xattr_sem);
1993 out:
1994         ext4_journal_stop(handle);
1995 out_free:
1996         brelse(iloc.bh);
1997         return error;
1998 }