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
  19 #define EXT4_XATTR_SYSTEM_DATA  "data"
  20 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  21 #define EXT4_INLINE_DOTDOT_SIZE 4
  22
  23 int ext4_get_inline_size(struct inode *inode)
  24 {
  25         if (EXT4_I(inode)->i_inline_off)
  26                 return EXT4_I(inode)->i_inline_size;
  27
  28         return 0;
  29 }
  30
  31 static int get_max_inline_xattr_value_size(struct inode *inode,
  32                                            struct ext4_iloc *iloc)
  33 {
  34         struct ext4_xattr_ibody_header *header;
  35         struct ext4_xattr_entry *entry;
  36         struct ext4_inode *raw_inode;
  37         int free, min_offs;
  38
  39         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  40                         EXT4_GOOD_OLD_INODE_SIZE -
  41                         EXT4_I(inode)->i_extra_isize -
  42                         sizeof(struct ext4_xattr_ibody_header);
  43
  44         /*
  45          * We need to subtract another sizeof(__u32) since an in-inode xattr
  46          * needs an empty 4 bytes to indicate the gap between the xattr entry
  47          * and the name/value pair.
  48          */
  49         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  50                 return EXT4_XATTR_SIZE(min_offs -
  51                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  52                         EXT4_XATTR_ROUND - sizeof(__u32));
  53
  54         raw_inode = ext4_raw_inode(iloc);
  55         header = IHDR(inode, raw_inode);
  56         entry = IFIRST(header);
  57
  58         /* Compute min_offs. */
  59         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  60                 if (!entry->e_value_block && entry->e_value_size) {
  61                         size_t offs = le16_to_cpu(entry->e_value_offs);
  62                         if (offs < min_offs)
  63                                 min_offs = offs;
  64                 }
  65         }
  66         free = min_offs -
  67                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  68
  69         if (EXT4_I(inode)->i_inline_off) {
  70                 entry = (struct ext4_xattr_entry *)
  71                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  72
  73                 free += le32_to_cpu(entry->e_value_size);
  74                 goto out;
  75         }
  76
  77         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  78
  79         if (free > EXT4_XATTR_ROUND)
  80                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  81         else
  82                 free = 0;
  83
  84 out:
  85         return free;
  86 }
  87
  88 /*
  89  * Get the maximum size we now can store in an inode.
  90  * If we can't find the space for a xattr entry, don't use the space
  91  * of the extents since we have no space to indicate the inline data.
  92  */
  93 int ext4_get_max_inline_size(struct inode *inode)
  94 {
  95         int error, max_inline_size;
  96         struct ext4_iloc iloc;
  97
  98         if (EXT4_I(inode)->i_extra_isize == 0)
  99                 return 0;
 100
 101         error = ext4_get_inode_loc(inode, &iloc);
 102         if (error) {
 103                 ext4_error_inode(inode, __func__, __LINE__, 0,
 104                                  "can't get inode location %lu",
 105                                  inode->i_ino);
 106                 return 0;
 107         }
 108
 109         down_read(&EXT4_I(inode)->xattr_sem);
 110         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 111         up_read(&EXT4_I(inode)->xattr_sem);
 112
 113         brelse(iloc.bh);
 114
 115         if (!max_inline_size)
 116                 return 0;
 117
 118         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 119 }
 120
 121 int ext4_has_inline_data(struct inode *inode)
 122 {
 123         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
 124                EXT4_I(inode)->i_inline_off;
 125 }
 126
 127 /*
 128  * this function does not take xattr_sem, which is OK because it is
 129  * currently only used in a code path coming form ext4_iget, before
 130  * the new inode has been unlocked
 131  */
 132 int ext4_find_inline_data_nolock(struct inode *inode)
 133 {
 134         struct ext4_xattr_ibody_find is = {
 135                 .s = { .not_found = -ENODATA, },
 136         };
 137         struct ext4_xattr_info i = {
 138                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 139                 .name = EXT4_XATTR_SYSTEM_DATA,
 140         };
 141         int error;
 142
 143         if (EXT4_I(inode)->i_extra_isize == 0)
 144                 return 0;
 145
 146         error = ext4_get_inode_loc(inode, &is.iloc);
 147         if (error)
 148                 return error;
 149
 150         error = ext4_xattr_ibody_find(inode, &i, &is);
 151         if (error)
 152                 goto out;
 153
 154         if (!is.s.not_found) {
 155                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 156                                         (void *)ext4_raw_inode(&is.iloc));
 157                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 158                                 le32_to_cpu(is.s.here->e_value_size);
 159                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 160         }
 161 out:
 162         brelse(is.iloc.bh);
 163         return error;
 164 }
 165
 166 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 167                                  unsigned int len,
 168                                  struct ext4_iloc *iloc)
 169 {
 170         struct ext4_xattr_entry *entry;
 171         struct ext4_xattr_ibody_header *header;
 172         int cp_len = 0;
 173         struct ext4_inode *raw_inode;
 174
 175         if (!len)
 176                 return 0;
 177
 178         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 179
 180         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 181                         len : EXT4_MIN_INLINE_DATA_SIZE;
 182
 183         raw_inode = ext4_raw_inode(iloc);
 184         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 185
 186         len -= cp_len;
 187         buffer += cp_len;
 188
 189         if (!len)
 190                 goto out;
 191
 192         header = IHDR(inode, raw_inode);
 193         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 194                                             EXT4_I(inode)->i_inline_off);
 195         len = min_t(unsigned int, len,
 196                     (unsigned int)le32_to_cpu(entry->e_value_size));
 197
 198         memcpy(buffer,
 199                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 200         cp_len += len;
 201
 202 out:
 203         return cp_len;
 204 }
 205
 206 /*
 207  * write the buffer to the inline inode.
 208  * If 'create' is set, we don't need to do the extra copy in the xattr
 209  * value since it is already handled by ext4_xattr_ibody_set. That saves
 210  * us one memcpy.
 211  */
 212 void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 213                             void *buffer, loff_t pos, unsigned int len)
 214 {
 215         struct ext4_xattr_entry *entry;
 216         struct ext4_xattr_ibody_header *header;
 217         struct ext4_inode *raw_inode;
 218         int cp_len = 0;
 219
 220         BUG_ON(!EXT4_I(inode)->i_inline_off);
 221         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 222
 223         raw_inode = ext4_raw_inode(iloc);
 224         buffer += pos;
 225
 226         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 227                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 228                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 229                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 230
 231                 len -= cp_len;
 232                 buffer += cp_len;
 233                 pos += cp_len;
 234         }
 235
 236         if (!len)
 237                 return;
 238
 239         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 240         header = IHDR(inode, raw_inode);
 241         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 242                                             EXT4_I(inode)->i_inline_off);
 243
 244         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 245                buffer, len);
 246 }
 247
 248 static int ext4_create_inline_data(handle_t *handle,
 249                                    struct inode *inode, unsigned len)
 250 {
 251         int error;
 252         void *value = NULL;
 253         struct ext4_xattr_ibody_find is = {
 254                 .s = { .not_found = -ENODATA, },
 255         };
 256         struct ext4_xattr_info i = {
 257                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 258                 .name = EXT4_XATTR_SYSTEM_DATA,
 259         };
 260
 261         error = ext4_get_inode_loc(inode, &is.iloc);
 262         if (error)
 263                 return error;
 264
 265         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 266         if (error)
 267                 goto out;
 268
 269         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 270                 value = (void *)empty_zero_page;
 271                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 272         } else {
 273                 value = "";
 274                 len = 0;
 275         }
 276
 277         /* Insert the the xttr entry. */
 278         i.value = value;
 279         i.value_len = len;
 280
 281         error = ext4_xattr_ibody_find(inode, &i, &is);
 282         if (error)
 283                 goto out;
 284
 285         BUG_ON(!is.s.not_found);
 286
 287         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 288         if (error) {
 289                 if (error == -ENOSPC)
 290                         ext4_clear_inode_state(inode,
 291                                                EXT4_STATE_MAY_INLINE_DATA);
 292                 goto out;
 293         }
 294
 295         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 296                 0, EXT4_MIN_INLINE_DATA_SIZE);
 297
 298         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 299                                       (void *)ext4_raw_inode(&is.iloc));
 300         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 301         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 302         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 303         get_bh(is.iloc.bh);
 304         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 305
 306 out:
 307         brelse(is.iloc.bh);
 308         return error;
 309 }
 310
 311 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 312                                    unsigned int len)
 313 {
 314         int error;
 315         void *value = NULL;
 316         struct ext4_xattr_ibody_find is = {
 317                 .s = { .not_found = -ENODATA, },
 318         };
 319         struct ext4_xattr_info i = {
 320                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 321                 .name = EXT4_XATTR_SYSTEM_DATA,
 322         };
 323
 324         /* If the old space is ok, write the data directly. */
 325         if (len <= EXT4_I(inode)->i_inline_size)
 326                 return 0;
 327
 328         error = ext4_get_inode_loc(inode, &is.iloc);
 329         if (error)
 330                 return error;
 331
 332         error = ext4_xattr_ibody_find(inode, &i, &is);
 333         if (error)
 334                 goto out;
 335
 336         BUG_ON(is.s.not_found);
 337
 338         len -= EXT4_MIN_INLINE_DATA_SIZE;
 339         value = kzalloc(len, GFP_NOFS);
 340         if (!value)
 341                 goto out;
 342
 343         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 344                                      value, len);
 345         if (error == -ENODATA)
 346                 goto out;
 347
 348         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 349         if (error)
 350                 goto out;
 351
 352         /* Update the xttr entry. */
 353         i.value = value;
 354         i.value_len = len;
 355
 356         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 357         if (error)
 358                 goto out;
 359
 360         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 361                                       (void *)ext4_raw_inode(&is.iloc));
 362         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 363                                 le32_to_cpu(is.s.here->e_value_size);
 364         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 365         get_bh(is.iloc.bh);
 366         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 367
 368 out:
 369         kfree(value);
 370         brelse(is.iloc.bh);
 371         return error;
 372 }
 373
 374 int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 375                              unsigned int len)
 376 {
 377         int ret, size;
 378         struct ext4_inode_info *ei = EXT4_I(inode);
 379
 380         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 381                 return -ENOSPC;
 382
 383         size = ext4_get_max_inline_size(inode);
 384         if (size < len)
 385                 return -ENOSPC;
 386
 387         down_write(&EXT4_I(inode)->xattr_sem);
 388
 389         if (ei->i_inline_off)
 390                 ret = ext4_update_inline_data(handle, inode, len);
 391         else
 392                 ret = ext4_create_inline_data(handle, inode, len);
 393
 394         up_write(&EXT4_I(inode)->xattr_sem);
 395
 396         return ret;
 397 }
 398
 399 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 400                                            struct inode *inode)
 401 {
 402         struct ext4_inode_info *ei = EXT4_I(inode);
 403         struct ext4_xattr_ibody_find is = {
 404                 .s = { .not_found = 0, },
 405         };
 406         struct ext4_xattr_info i = {
 407                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 408                 .name = EXT4_XATTR_SYSTEM_DATA,
 409                 .value = NULL,
 410                 .value_len = 0,
 411         };
 412         int error;
 413
 414         if (!ei->i_inline_off)
 415                 return 0;
 416
 417         error = ext4_get_inode_loc(inode, &is.iloc);
 418         if (error)
 419                 return error;
 420
 421         error = ext4_xattr_ibody_find(inode, &i, &is);
 422         if (error)
 423                 goto out;
 424
 425         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 426         if (error)
 427                 goto out;
 428
 429         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 430         if (error)
 431                 goto out;
 432
 433         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 434                 0, EXT4_MIN_INLINE_DATA_SIZE);
 435
 436         if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
 437                                       EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 438                 if (S_ISDIR(inode->i_mode) ||
 439                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 440                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 441                         ext4_ext_tree_init(handle, inode);
 442                 }
 443         }
 444         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 445
 446         get_bh(is.iloc.bh);
 447         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 448
 449         EXT4_I(inode)->i_inline_off = 0;
 450         EXT4_I(inode)->i_inline_size = 0;
 451         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 452 out:
 453         brelse(is.iloc.bh);
 454         if (error == -ENODATA)
 455                 error = 0;
 456         return error;
 457 }
 458
 459 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 460 {
 461         void *kaddr;
 462         int ret = 0;
 463         size_t len;
 464         struct ext4_iloc iloc;
 465
 466         BUG_ON(!PageLocked(page));
 467         BUG_ON(!ext4_has_inline_data(inode));
 468         BUG_ON(page->index);
 469
 470         if (!EXT4_I(inode)->i_inline_off) {
 471                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 472                              inode->i_ino);
 473                 goto out;
 474         }
 475
 476         ret = ext4_get_inode_loc(inode, &iloc);
 477         if (ret)
 478                 goto out;
 479
 480         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 481         kaddr = kmap_atomic(page);
 482         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 483         flush_dcache_page(page);
 484         kunmap_atomic(kaddr);
 485         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 486         SetPageUptodate(page);
 487         brelse(iloc.bh);
 488
 489 out:
 490         return ret;
 491 }
 492
 493 int ext4_readpage_inline(struct inode *inode, struct page *page)
 494 {
 495         int ret = 0;
 496
 497         down_read(&EXT4_I(inode)->xattr_sem);
 498         if (!ext4_has_inline_data(inode)) {
 499                 up_read(&EXT4_I(inode)->xattr_sem);
 500                 return -EAGAIN;
 501         }
 502
 503         /*
 504          * Current inline data can only exist in the 1st page,
 505          * So for all the other pages, just set them uptodate.
 506          */
 507         if (!page->index)
 508                 ret = ext4_read_inline_page(inode, page);
 509         else if (!PageUptodate(page)) {
 510                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 511                 SetPageUptodate(page);
 512         }
 513
 514         up_read(&EXT4_I(inode)->xattr_sem);
 515
 516         unlock_page(page);
 517         return ret >= 0 ? 0 : ret;
 518 }
 519
 520 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 521                                               struct inode *inode,
 522                                               unsigned flags)
 523 {
 524         int ret, needed_blocks;
 525         handle_t *handle = NULL;
 526         int retries = 0, sem_held = 0;
 527         struct page *page = NULL;
 528         unsigned from, to;
 529         struct ext4_iloc iloc;
 530
 531         if (!ext4_has_inline_data(inode)) {
 532                 /*
 533                  * clear the flag so that no new write
 534                  * will trap here again.
 535                  */
 536                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 537                 return 0;
 538         }
 539
 540         needed_blocks = ext4_writepage_trans_blocks(inode);
 541
 542         ret = ext4_get_inode_loc(inode, &iloc);
 543         if (ret)
 544                 return ret;
 545
 546 retry:
 547         handle = ext4_journal_start(inode, needed_blocks);
 548         if (IS_ERR(handle)) {
 549                 ret = PTR_ERR(handle);
 550                 handle = NULL;
 551                 goto out;
 552         }
 553
 554         /* We cannot recurse into the filesystem as the transaction is already
 555          * started */
 556         flags |= AOP_FLAG_NOFS;
 557
 558         page = grab_cache_page_write_begin(mapping, 0, flags);
 559         if (!page) {
 560                 ret = -ENOMEM;
 561                 goto out;
 562         }
 563
 564         down_write(&EXT4_I(inode)->xattr_sem);
 565         sem_held = 1;
 566         /* If some one has already done this for us, just exit. */
 567         if (!ext4_has_inline_data(inode)) {
 568                 ret = 0;
 569                 goto out;
 570         }
 571
 572         from = 0;
 573         to = ext4_get_inline_size(inode);
 574         if (!PageUptodate(page)) {
 575                 ret = ext4_read_inline_page(inode, page);
 576                 if (ret < 0)
 577                         goto out;
 578         }
 579
 580         ret = ext4_destroy_inline_data_nolock(handle, inode);
 581         if (ret)
 582                 goto out;
 583
 584         if (ext4_should_dioread_nolock(inode))
 585                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 586         else
 587                 ret = __block_write_begin(page, from, to, ext4_get_block);
 588
 589         if (!ret && ext4_should_journal_data(inode)) {
 590                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 591                                              from, to, NULL,
 592                                              do_journal_get_write_access);
 593         }
 594
 595         if (ret) {
 596                 unlock_page(page);
 597                 page_cache_release(page);
 598                 ext4_orphan_add(handle, inode);
 599                 up_write(&EXT4_I(inode)->xattr_sem);
 600                 sem_held = 0;
 601                 ext4_journal_stop(handle);
 602                 handle = NULL;
 603                 ext4_truncate_failed_write(inode);
 604                 /*
 605                  * If truncate failed early the inode might
 606                  * still be on the orphan list; we need to
 607                  * make sure the inode is removed from the
 608                  * orphan list in that case.
 609                  */
 610                 if (inode->i_nlink)
 611                         ext4_orphan_del(NULL, inode);
 612         }
 613
 614         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 615                 goto retry;
 616
 617         block_commit_write(page, from, to);
 618 out:
 619         if (page) {
 620                 unlock_page(page);
 621                 page_cache_release(page);
 622         }
 623         if (sem_held)
 624                 up_write(&EXT4_I(inode)->xattr_sem);
 625         if (handle)
 626                 ext4_journal_stop(handle);
 627         brelse(iloc.bh);
 628         return ret;
 629 }
 630
 631 /*
 632  * Try to write data in the inode.
 633  * If the inode has inline data, check whether the new write can be
 634  * in the inode also. If not, create the page the handle, move the data
 635  * to the page make it update and let the later codes create extent for it.
 636  */
 637 int ext4_try_to_write_inline_data(struct address_space *mapping,
 638                                   struct inode *inode,
 639                                   loff_t pos, unsigned len,
 640                                   unsigned flags,
 641                                   struct page **pagep)
 642 {
 643         int ret;
 644         handle_t *handle;
 645         struct page *page;
 646         struct ext4_iloc iloc;
 647
 648         if (pos + len > ext4_get_max_inline_size(inode))
 649                 goto convert;
 650
 651         ret = ext4_get_inode_loc(inode, &iloc);
 652         if (ret)
 653                 return ret;
 654
 655         /*
 656          * The possible write could happen in the inode,
 657          * so try to reserve the space in inode first.
 658          */
 659         handle = ext4_journal_start(inode, 1);
 660         if (IS_ERR(handle)) {
 661                 ret = PTR_ERR(handle);
 662                 handle = NULL;
 663                 goto out;
 664         }
 665
 666         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 667         if (ret && ret != -ENOSPC)
 668                 goto out;
 669
 670         /* We don't have space in inline inode, so convert it to extent. */
 671         if (ret == -ENOSPC) {
 672                 ext4_journal_stop(handle);
 673                 brelse(iloc.bh);
 674                 goto convert;
 675         }
 676
 677         flags |= AOP_FLAG_NOFS;
 678
 679         page = grab_cache_page_write_begin(mapping, 0, flags);
 680         if (!page) {
 681                 ret = -ENOMEM;
 682                 goto out;
 683         }
 684
 685         *pagep = page;
 686         down_read(&EXT4_I(inode)->xattr_sem);
 687         if (!ext4_has_inline_data(inode)) {
 688                 ret = 0;
 689                 unlock_page(page);
 690                 page_cache_release(page);
 691                 goto out_up_read;
 692         }
 693
 694         if (!PageUptodate(page)) {
 695                 ret = ext4_read_inline_page(inode, page);
 696                 if (ret < 0)
 697                         goto out_up_read;
 698         }
 699
 700         ret = 1;
 701         handle = NULL;
 702 out_up_read:
 703         up_read(&EXT4_I(inode)->xattr_sem);
 704 out:
 705         if (handle)
 706                 ext4_journal_stop(handle);
 707         brelse(iloc.bh);
 708         return ret;
 709 convert:
 710         return ext4_convert_inline_data_to_extent(mapping,
 711                                                   inode, flags);
 712 }
 713
 714 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 715                                unsigned copied, struct page *page)
 716 {
 717         int ret;
 718         void *kaddr;
 719         struct ext4_iloc iloc;
 720
 721         if (unlikely(copied < len)) {
 722                 if (!PageUptodate(page)) {
 723                         copied = 0;
 724                         goto out;
 725                 }
 726         }
 727
 728         ret = ext4_get_inode_loc(inode, &iloc);
 729         if (ret) {
 730                 ext4_std_error(inode->i_sb, ret);
 731                 copied = 0;
 732                 goto out;
 733         }
 734
 735         down_write(&EXT4_I(inode)->xattr_sem);
 736         BUG_ON(!ext4_has_inline_data(inode));
 737
 738         kaddr = kmap_atomic(page);
 739         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 740         kunmap_atomic(kaddr);
 741         SetPageUptodate(page);
 742         /* clear page dirty so that writepages wouldn't work for us. */
 743         ClearPageDirty(page);
 744
 745         up_write(&EXT4_I(inode)->xattr_sem);
 746         brelse(iloc.bh);
 747 out:
 748         return copied;
 749 }
 750
 751 struct buffer_head *
 752 ext4_journalled_write_inline_data(struct inode *inode,
 753                                   unsigned len,
 754                                   struct page *page)
 755 {
 756         int ret;
 757         void *kaddr;
 758         struct ext4_iloc iloc;
 759
 760         ret = ext4_get_inode_loc(inode, &iloc);
 761         if (ret) {
 762                 ext4_std_error(inode->i_sb, ret);
 763                 return NULL;
 764         }
 765
 766         down_write(&EXT4_I(inode)->xattr_sem);
 767         kaddr = kmap_atomic(page);
 768         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 769         kunmap_atomic(kaddr);
 770         up_write(&EXT4_I(inode)->xattr_sem);
 771
 772         return iloc.bh;
 773 }
 774
 775 /*
 776  * Try to make the page cache and handle ready for the inline data case.
 777  * We can call this function in 2 cases:
 778  * 1. The inode is created and the first write exceeds inline size. We can
 779  *    clear the inode state safely.
 780  * 2. The inode has inline data, then we need to read the data, make it
 781  *    update and dirty so that ext4_da_writepages can handle it. We don't
 782  *    need to start the journal since the file's metatdata isn't changed now.
 783  */
 784 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 785                                                  struct inode *inode,
 786                                                  unsigned flags,
 787                                                  void **fsdata)
 788 {
 789         int ret = 0, inline_size;
 790         struct page *page;
 791
 792         page = grab_cache_page_write_begin(mapping, 0, flags);
 793         if (!page)
 794                 return -ENOMEM;
 795
 796         down_read(&EXT4_I(inode)->xattr_sem);
 797         if (!ext4_has_inline_data(inode)) {
 798                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 799                 goto out;
 800         }
 801
 802         inline_size = ext4_get_inline_size(inode);
 803
 804         if (!PageUptodate(page)) {
 805                 ret = ext4_read_inline_page(inode, page);
 806                 if (ret < 0)
 807                         goto out;
 808         }
 809
 810         ret = __block_write_begin(page, 0, inline_size,
 811                                   ext4_da_get_block_prep);
 812         if (ret) {
 813                 ext4_truncate_failed_write(inode);
 814                 goto out;
 815         }
 816
 817         SetPageDirty(page);
 818         SetPageUptodate(page);
 819         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 820         *fsdata = (void *)CONVERT_INLINE_DATA;
 821
 822 out:
 823         up_read(&EXT4_I(inode)->xattr_sem);
 824         if (page) {
 825                 unlock_page(page);
 826                 page_cache_release(page);
 827         }
 828         return ret;
 829 }
 830
 831 /*
 832  * Prepare the write for the inline data.
 833  * If the the data can be written into the inode, we just read
 834  * the page and make it uptodate, and start the journal.
 835  * Otherwise read the page, makes it dirty so that it can be
 836  * handle in writepages(the i_disksize update is left to the
 837  * normal ext4_da_write_end).
 838  */
 839 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 840                                     struct inode *inode,
 841                                     loff_t pos, unsigned len,
 842                                     unsigned flags,
 843                                     struct page **pagep,
 844                                     void **fsdata)
 845 {
 846         int ret, inline_size;
 847         handle_t *handle;
 848         struct page *page;
 849         struct ext4_iloc iloc;
 850
 851         ret = ext4_get_inode_loc(inode, &iloc);
 852         if (ret)
 853                 return ret;
 854
 855         handle = ext4_journal_start(inode, 1);
 856         if (IS_ERR(handle)) {
 857                 ret = PTR_ERR(handle);
 858                 handle = NULL;
 859                 goto out;
 860         }
 861
 862         inline_size = ext4_get_max_inline_size(inode);
 863
 864         ret = -ENOSPC;
 865         if (inline_size >= pos + len) {
 866                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 867                 if (ret && ret != -ENOSPC)
 868                         goto out;
 869         }
 870
 871         if (ret == -ENOSPC) {
 872                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 873                                                             inode,
 874                                                             flags,
 875                                                             fsdata);
 876                 goto out;
 877         }
 878
 879         /*
 880          * We cannot recurse into the filesystem as the transaction
 881          * is already started.
 882          */
 883         flags |= AOP_FLAG_NOFS;
 884
 885         page = grab_cache_page_write_begin(mapping, 0, flags);
 886         if (!page) {
 887                 ret = -ENOMEM;
 888                 goto out;
 889         }
 890
 891         down_read(&EXT4_I(inode)->xattr_sem);
 892         if (!ext4_has_inline_data(inode)) {
 893                 ret = 0;
 894                 goto out_release_page;
 895         }
 896
 897         if (!PageUptodate(page)) {
 898                 ret = ext4_read_inline_page(inode, page);
 899                 if (ret < 0)
 900                         goto out_release_page;
 901         }
 902
 903         up_read(&EXT4_I(inode)->xattr_sem);
 904         *pagep = page;
 905         handle = NULL;
 906         brelse(iloc.bh);
 907         return 1;
 908 out_release_page:
 909         up_read(&EXT4_I(inode)->xattr_sem);
 910         unlock_page(page);
 911         page_cache_release(page);
 912 out:
 913         if (handle)
 914                 ext4_journal_stop(handle);
 915         brelse(iloc.bh);
 916         return ret;
 917 }
 918
 919 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 920                                   unsigned len, unsigned copied,
 921                                   struct page *page)
 922 {
 923         int i_size_changed = 0;
 924
 925         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 926
 927         /*
 928          * No need to use i_size_read() here, the i_size
 929          * cannot change under us because we hold i_mutex.
 930          *
 931          * But it's important to update i_size while still holding page lock:
 932          * page writeout could otherwise come in and zero beyond i_size.
 933          */
 934         if (pos+copied > inode->i_size) {
 935                 i_size_write(inode, pos+copied);
 936                 i_size_changed = 1;
 937         }
 938         unlock_page(page);
 939         page_cache_release(page);
 940
 941         /*
 942          * Don't mark the inode dirty under page lock. First, it unnecessarily
 943          * makes the holding time of page lock longer. Second, it forces lock
 944          * ordering of page lock and transaction start for journaling
 945          * filesystems.
 946          */
 947         if (i_size_changed)
 948                 mark_inode_dirty(inode);
 949
 950         return copied;
 951 }
 952
 953 #ifdef INLINE_DIR_DEBUG
 954 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 955                           void *inline_start, int inline_size)
 956 {
 957         int offset;
 958         unsigned short de_len;
 959         struct ext4_dir_entry_2 *de = inline_start;
 960         void *dlimit = inline_start + inline_size;
 961
 962         trace_printk("inode %lu\n", dir->i_ino);
 963         offset = 0;
 964         while ((void *)de < dlimit) {
 965                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 966                 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
 967                              offset, de_len, de->name_len, de->name,
 968                              de->name_len, le32_to_cpu(de->inode));
 969                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 970                                          inline_start, inline_size, offset))
 971                         BUG();
 972
 973                 offset += de_len;
 974                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 975         }
 976 }
 977 #else
 978 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 979 #endif
 980
 981 /*
 982  * Add a new entry into a inline dir.
 983  * It will return -ENOSPC if no space is available, and -EIO
 984  * and -EEXIST if directory entry already exists.
 985  */
 986 static int ext4_add_dirent_to_inline(handle_t *handle,
 987                                      struct dentry *dentry,
 988                                      struct inode *inode,
 989                                      struct ext4_iloc *iloc,
 990                                      void *inline_start, int inline_size)
 991 {
 992         struct inode    *dir = dentry->d_parent->d_inode;
 993         const char      *name = dentry->d_name.name;
 994         int             namelen = dentry->d_name.len;
 995         unsigned short  reclen;
 996         int             err;
 997         struct ext4_dir_entry_2 *de;
 998
 999         reclen = EXT4_DIR_REC_LEN(namelen);
1000         err = ext4_find_dest_de(dir, inode, iloc->bh,
1001                                 inline_start, inline_size,
1002                                 name, namelen, &de);
1003         if (err)
1004                 return err;
1005
1006         err = ext4_journal_get_write_access(handle, iloc->bh);
1007         if (err)
1008                 return err;
1009         ext4_insert_dentry(inode, de, inline_size, name, namelen);
1010
1011         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1012
1013         /*
1014          * XXX shouldn't update any times until successful
1015          * completion of syscall, but too many callers depend
1016          * on this.
1017          *
1018          * XXX similarly, too many callers depend on
1019          * ext4_new_inode() setting the times, but error
1020          * recovery deletes the inode, so the worst that can
1021          * happen is that the times are slightly out of date
1022          * and/or different from the directory change time.
1023          */
1024         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1025         ext4_update_dx_flag(dir);
1026         dir->i_version++;
1027         ext4_mark_inode_dirty(handle, dir);
1028         return 1;
1029 }
1030
1031 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1032                                        struct ext4_iloc *iloc)
1033 {
1034         struct ext4_xattr_entry *entry;
1035         struct ext4_xattr_ibody_header *header;
1036
1037         BUG_ON(!EXT4_I(inode)->i_inline_off);
1038
1039         header = IHDR(inode, ext4_raw_inode(iloc));
1040         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1041                                             EXT4_I(inode)->i_inline_off);
1042
1043         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1044 }
1045
1046 /* Set the final de to cover the whole block. */
1047 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1048 {
1049         struct ext4_dir_entry_2 *de, *prev_de;
1050         void *limit;
1051         int de_len;
1052
1053         de = (struct ext4_dir_entry_2 *)de_buf;
1054         if (old_size) {
1055                 limit = de_buf + old_size;
1056                 do {
1057                         prev_de = de;
1058                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1059                         de_buf += de_len;
1060                         de = (struct ext4_dir_entry_2 *)de_buf;
1061                 } while (de_buf < limit);
1062
1063                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1064                                                         old_size, new_size);
1065         } else {
1066                 /* this is just created, so create an empty entry. */
1067                 de->inode = 0;
1068                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1069         }
1070 }
1071
1072 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1073                                   struct ext4_iloc *iloc)
1074 {
1075         int ret;
1076         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1077         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1078
1079         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1080                 return -ENOSPC;
1081
1082         ret = ext4_update_inline_data(handle, dir,
1083                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1084         if (ret)
1085                 return ret;
1086
1087         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1088                              EXT4_I(dir)->i_inline_size -
1089                                                 EXT4_MIN_INLINE_DATA_SIZE);
1090         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1091         return 0;
1092 }
1093
1094 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1095                                      struct ext4_iloc *iloc,
1096                                      void *buf, int inline_size)
1097 {
1098         ext4_create_inline_data(handle, inode, inline_size);
1099         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1100         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1101 }
1102
1103 static int ext4_finish_convert_inline_dir(handle_t *handle,
1104                                           struct inode *inode,
1105                                           struct buffer_head *dir_block,
1106                                           void *buf,
1107                                           int inline_size)
1108 {
1109         int err, csum_size = 0, header_size = 0;
1110         struct ext4_dir_entry_2 *de;
1111         struct ext4_dir_entry_tail *t;
1112         void *target = dir_block->b_data;
1113
1114         /*
1115          * First create "." and ".." and then copy the dir information
1116          * back to the block.
1117          */
1118         de = (struct ext4_dir_entry_2 *)target;
1119         de = ext4_init_dot_dotdot(inode, de,
1120                 inode->i_sb->s_blocksize, csum_size,
1121                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1122         header_size = (void *)de - target;
1123
1124         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1125                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1126
1127         if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1128                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1129                 csum_size = sizeof(struct ext4_dir_entry_tail);
1130
1131         inode->i_size = inode->i_sb->s_blocksize;
1132         i_size_write(inode, inode->i_sb->s_blocksize);
1133         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1134         ext4_update_final_de(dir_block->b_data,
1135                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1136                         inode->i_sb->s_blocksize - csum_size);
1137
1138         if (csum_size) {
1139                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1140                                      inode->i_sb->s_blocksize);
1141                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1142         }
1143         set_buffer_uptodate(dir_block);
1144         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1145         if (err)
1146                 goto out;
1147         set_buffer_verified(dir_block);
1148 out:
1149         return err;
1150 }
1151
1152 static int ext4_convert_inline_data_nolock(handle_t *handle,
1153                                            struct inode *inode,
1154                                            struct ext4_iloc *iloc)
1155 {
1156         int error;
1157         void *buf = NULL;
1158         struct buffer_head *data_bh = NULL;
1159         struct ext4_map_blocks map;
1160         int inline_size;
1161
1162         inline_size = ext4_get_inline_size(inode);
1163         buf = kmalloc(inline_size, GFP_NOFS);
1164         if (!buf) {
1165                 error = -ENOMEM;
1166                 goto out;
1167         }
1168
1169         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1170         if (error < 0)
1171                 goto out;
1172
1173         error = ext4_destroy_inline_data_nolock(handle, inode);
1174         if (error)
1175                 goto out;
1176
1177         map.m_lblk = 0;
1178         map.m_len = 1;
1179         map.m_flags = 0;
1180         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1181         if (error < 0)
1182                 goto out_restore;
1183         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1184                 error = -EIO;
1185                 goto out_restore;
1186         }
1187
1188         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1189         if (!data_bh) {
1190                 error = -EIO;
1191                 goto out_restore;
1192         }
1193
1194         lock_buffer(data_bh);
1195         error = ext4_journal_get_create_access(handle, data_bh);
1196         if (error) {
1197                 unlock_buffer(data_bh);
1198                 error = -EIO;
1199                 goto out_restore;
1200         }
1201         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1202
1203         if (!S_ISDIR(inode->i_mode)) {
1204                 memcpy(data_bh->b_data, buf, inline_size);
1205                 set_buffer_uptodate(data_bh);
1206                 error = ext4_handle_dirty_metadata(handle,
1207                                                    inode, data_bh);
1208         } else {
1209                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1210                                                        buf, inline_size);
1211         }
1212
1213         unlock_buffer(data_bh);
1214 out_restore:
1215         if (error)
1216                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1217
1218 out:
1219         brelse(data_bh);
1220         kfree(buf);
1221         return error;
1222 }
1223
1224 /*
1225  * Try to add the new entry to the inline data.
1226  * If succeeds, return 0. If not, extended the inline dir and copied data to
1227  * the new created block.
1228  */
1229 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1230                               struct inode *inode)
1231 {
1232         int ret, inline_size;
1233         void *inline_start;
1234         struct ext4_iloc iloc;
1235         struct inode *dir = dentry->d_parent->d_inode;
1236
1237         ret = ext4_get_inode_loc(dir, &iloc);
1238         if (ret)
1239                 return ret;
1240
1241         down_write(&EXT4_I(dir)->xattr_sem);
1242         if (!ext4_has_inline_data(dir))
1243                 goto out;
1244
1245         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1246                                                  EXT4_INLINE_DOTDOT_SIZE;
1247         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1248
1249         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1250                                         inline_start, inline_size);
1251         if (ret != -ENOSPC)
1252                 goto out;
1253
1254         /* check whether it can be inserted to inline xattr space. */
1255         inline_size = EXT4_I(dir)->i_inline_size -
1256                         EXT4_MIN_INLINE_DATA_SIZE;
1257         if (!inline_size) {
1258                 /* Try to use the xattr space.*/
1259                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1260                 if (ret && ret != -ENOSPC)
1261                         goto out;
1262
1263                 inline_size = EXT4_I(dir)->i_inline_size -
1264                                 EXT4_MIN_INLINE_DATA_SIZE;
1265         }
1266
1267         if (inline_size) {
1268                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1269
1270                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1271                                                 inline_start, inline_size);
1272
1273                 if (ret != -ENOSPC)
1274                         goto out;
1275         }
1276
1277         /*
1278          * The inline space is filled up, so create a new block for it.
1279          * As the extent tree will be created, we have to save the inline
1280          * dir first.
1281          */
1282         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1283
1284 out:
1285         ext4_mark_inode_dirty(handle, dir);
1286         up_write(&EXT4_I(dir)->xattr_sem);
1287         brelse(iloc.bh);
1288         return ret;
1289 }
1290
1291 /*
1292  * Try to create the inline data for the new dir.
1293  * If it succeeds, return 0, otherwise return the error.
1294  * In case of ENOSPC, the caller should create the normal disk layout dir.
1295  */
1296 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1297                                struct inode *inode)
1298 {
1299         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1300         struct ext4_iloc iloc;
1301         struct ext4_dir_entry_2 *de;
1302
1303         ret = ext4_get_inode_loc(inode, &iloc);
1304         if (ret)
1305                 return ret;
1306
1307         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1308         if (ret)
1309                 goto out;
1310
1311         /*
1312          * For inline dir, we only save the inode information for the ".."
1313          * and create a fake dentry to cover the left space.
1314          */
1315         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1316         de->inode = cpu_to_le32(parent->i_ino);
1317         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1318         de->inode = 0;
1319         de->rec_len = ext4_rec_len_to_disk(
1320                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1321                                 inline_size);
1322         set_nlink(inode, 2);
1323         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1324 out:
1325         brelse(iloc.bh);
1326         return ret;
1327 }
1328
1329 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1330 {
1331         int ret;
1332
1333         down_write(&EXT4_I(inode)->xattr_sem);
1334         ret = ext4_destroy_inline_data_nolock(handle, inode);
1335         up_write(&EXT4_I(inode)->xattr_sem);
1336
1337         return ret;
1338 }