kernel/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
  15 #include <linux/fiemap.h>
  16
  17 #include "ext4_jbd2.h"
  18 #include "ext4.h"
  19 #include "xattr.h"
  20 #include "truncate.h"
  21
  22 #define EXT4_XATTR_SYSTEM_DATA  "data"
  23 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  24 #define EXT4_INLINE_DOTDOT_OFFSET       2
  25 #define EXT4_INLINE_DOTDOT_SIZE         4
  26
  27 static int ext4_get_inline_size(struct inode *inode)
  28 {
  29         if (EXT4_I(inode)->i_inline_off)
  30                 return EXT4_I(inode)->i_inline_size;
  31
  32         return 0;
  33 }
  34
  35 static int get_max_inline_xattr_value_size(struct inode *inode,
  36                                            struct ext4_iloc *iloc)
  37 {
  38         struct ext4_xattr_ibody_header *header;
  39         struct ext4_xattr_entry *entry;
  40         struct ext4_inode *raw_inode;
  41         int free, min_offs;
  42
  43         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  44                         EXT4_GOOD_OLD_INODE_SIZE -
  45                         EXT4_I(inode)->i_extra_isize -
  46                         sizeof(struct ext4_xattr_ibody_header);
  47
  48         /*
  49          * We need to subtract another sizeof(__u32) since an in-inode xattr
  50          * needs an empty 4 bytes to indicate the gap between the xattr entry
  51          * and the name/value pair.
  52          */
  53         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  54                 return EXT4_XATTR_SIZE(min_offs -
  55                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  56                         EXT4_XATTR_ROUND - sizeof(__u32));
  57
  58         raw_inode = ext4_raw_inode(iloc);
  59         header = IHDR(inode, raw_inode);
  60         entry = IFIRST(header);
  61
  62         /* Compute min_offs. */
  63         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  64                 if (!entry->e_value_block && entry->e_value_size) {
  65                         size_t offs = le16_to_cpu(entry->e_value_offs);
  66                         if (offs < min_offs)
  67                                 min_offs = offs;
  68                 }
  69         }
  70         free = min_offs -
  71                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  72
  73         if (EXT4_I(inode)->i_inline_off) {
  74                 entry = (struct ext4_xattr_entry *)
  75                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  76
  77                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  78                 goto out;
  79         }
  80
  81         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  82
  83         if (free > EXT4_XATTR_ROUND)
  84                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  85         else
  86                 free = 0;
  87
  88 out:
  89         return free;
  90 }
  91
  92 /*
  93  * Get the maximum size we now can store in an inode.
  94  * If we can't find the space for a xattr entry, don't use the space
  95  * of the extents since we have no space to indicate the inline data.
  96  */
  97 int ext4_get_max_inline_size(struct inode *inode)
  98 {
  99         int error, max_inline_size;
 100         struct ext4_iloc iloc;
 101
 102         if (EXT4_I(inode)->i_extra_isize == 0)
 103                 return 0;
 104
 105         error = ext4_get_inode_loc(inode, &iloc);
 106         if (error) {
 107                 ext4_error_inode(inode, __func__, __LINE__, 0,
 108                                  "can't get inode location %lu",
 109                                  inode->i_ino);
 110                 return 0;
 111         }
 112
 113         down_read(&EXT4_I(inode)->xattr_sem);
 114         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 115         up_read(&EXT4_I(inode)->xattr_sem);
 116
 117         brelse(iloc.bh);
 118
 119         if (!max_inline_size)
 120                 return 0;
 121
 122         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 123 }
 124
 125 /*
 126  * this function does not take xattr_sem, which is OK because it is
 127  * currently only used in a code path coming form ext4_iget, before
 128  * the new inode has been unlocked
 129  */
 130 int ext4_find_inline_data_nolock(struct inode *inode)
 131 {
 132         struct ext4_xattr_ibody_find is = {
 133                 .s = { .not_found = -ENODATA, },
 134         };
 135         struct ext4_xattr_info i = {
 136                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 137                 .name = EXT4_XATTR_SYSTEM_DATA,
 138         };
 139         int error;
 140
 141         if (EXT4_I(inode)->i_extra_isize == 0)
 142                 return 0;
 143
 144         error = ext4_get_inode_loc(inode, &is.iloc);
 145         if (error)
 146                 return error;
 147
 148         error = ext4_xattr_ibody_find(inode, &i, &is);
 149         if (error)
 150                 goto out;
 151
 152         if (!is.s.not_found) {
 153                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 154                                         (void *)ext4_raw_inode(&is.iloc));
 155                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 156                                 le32_to_cpu(is.s.here->e_value_size);
 157                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 158         }
 159 out:
 160         brelse(is.iloc.bh);
 161         return error;
 162 }
 163
 164 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 165                                  unsigned int len,
 166                                  struct ext4_iloc *iloc)
 167 {
 168         struct ext4_xattr_entry *entry;
 169         struct ext4_xattr_ibody_header *header;
 170         int cp_len = 0;
 171         struct ext4_inode *raw_inode;
 172
 173         if (!len)
 174                 return 0;
 175
 176         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 177
 178         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 179                         len : EXT4_MIN_INLINE_DATA_SIZE;
 180
 181         raw_inode = ext4_raw_inode(iloc);
 182         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 183
 184         len -= cp_len;
 185         buffer += cp_len;
 186
 187         if (!len)
 188                 goto out;
 189
 190         header = IHDR(inode, raw_inode);
 191         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 192                                             EXT4_I(inode)->i_inline_off);
 193         len = min_t(unsigned int, len,
 194                     (unsigned int)le32_to_cpu(entry->e_value_size));
 195
 196         memcpy(buffer,
 197                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 198         cp_len += len;
 199
 200 out:
 201         return cp_len;
 202 }
 203
 204 /*
 205  * write the buffer to the inline inode.
 206  * If 'create' is set, we don't need to do the extra copy in the xattr
 207  * value since it is already handled by ext4_xattr_ibody_inline_set.
 208  * That saves us one memcpy.
 209  */
 210 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 211                                    void *buffer, loff_t pos, unsigned int len)
 212 {
 213         struct ext4_xattr_entry *entry;
 214         struct ext4_xattr_ibody_header *header;
 215         struct ext4_inode *raw_inode;
 216         int cp_len = 0;
 217
 218         BUG_ON(!EXT4_I(inode)->i_inline_off);
 219         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 220
 221         raw_inode = ext4_raw_inode(iloc);
 222         buffer += pos;
 223
 224         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 225                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 226                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 227                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 228
 229                 len -= cp_len;
 230                 buffer += cp_len;
 231                 pos += cp_len;
 232         }
 233
 234         if (!len)
 235                 return;
 236
 237         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 238         header = IHDR(inode, raw_inode);
 239         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 240                                             EXT4_I(inode)->i_inline_off);
 241
 242         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 243                buffer, len);
 244 }
 245
 246 static int ext4_create_inline_data(handle_t *handle,
 247                                    struct inode *inode, unsigned len)
 248 {
 249         int error;
 250         void *value = NULL;
 251         struct ext4_xattr_ibody_find is = {
 252                 .s = { .not_found = -ENODATA, },
 253         };
 254         struct ext4_xattr_info i = {
 255                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 256                 .name = EXT4_XATTR_SYSTEM_DATA,
 257         };
 258
 259         error = ext4_get_inode_loc(inode, &is.iloc);
 260         if (error)
 261                 return error;
 262
 263         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 264         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 265         if (error)
 266                 goto out;
 267
 268         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 269                 value = EXT4_ZERO_XATTR_VALUE;
 270                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 271         } else {
 272                 value = "";
 273                 len = 0;
 274         }
 275
 276         /* Insert the the xttr entry. */
 277         i.value = value;
 278         i.value_len = len;
 279
 280         error = ext4_xattr_ibody_find(inode, &i, &is);
 281         if (error)
 282                 goto out;
 283
 284         BUG_ON(!is.s.not_found);
 285
 286         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 287         if (error) {
 288                 if (error == -ENOSPC)
 289                         ext4_clear_inode_state(inode,
 290                                                EXT4_STATE_MAY_INLINE_DATA);
 291                 goto out;
 292         }
 293
 294         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 295                 0, EXT4_MIN_INLINE_DATA_SIZE);
 296
 297         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 298                                       (void *)ext4_raw_inode(&is.iloc));
 299         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 300         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 301         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 302         get_bh(is.iloc.bh);
 303         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 304
 305 out:
 306         brelse(is.iloc.bh);
 307         return error;
 308 }
 309
 310 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 311                                    unsigned int len)
 312 {
 313         int error;
 314         void *value = NULL;
 315         struct ext4_xattr_ibody_find is = {
 316                 .s = { .not_found = -ENODATA, },
 317         };
 318         struct ext4_xattr_info i = {
 319                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 320                 .name = EXT4_XATTR_SYSTEM_DATA,
 321         };
 322
 323         /* If the old space is ok, write the data directly. */
 324         if (len <= EXT4_I(inode)->i_inline_size)
 325                 return 0;
 326
 327         error = ext4_get_inode_loc(inode, &is.iloc);
 328         if (error)
 329                 return error;
 330
 331         error = ext4_xattr_ibody_find(inode, &i, &is);
 332         if (error)
 333                 goto out;
 334
 335         BUG_ON(is.s.not_found);
 336
 337         len -= EXT4_MIN_INLINE_DATA_SIZE;
 338         value = kzalloc(len, GFP_NOFS);
 339         if (!value)
 340                 goto out;
 341
 342         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 343                                      value, len);
 344         if (error == -ENODATA)
 345                 goto out;
 346
 347         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 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_inline_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 static 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         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 426         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 427         if (error)
 428                 goto out;
 429
 430         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 431         if (error)
 432                 goto out;
 433
 434         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 435                 0, EXT4_MIN_INLINE_DATA_SIZE);
 436
 437         if (ext4_has_feature_extents(inode->i_sb)) {
 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, EXT4_HT_WRITE_PAGE, 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                 page = NULL;
 599                 ext4_orphan_add(handle, inode);
 600                 up_write(&EXT4_I(inode)->xattr_sem);
 601                 sem_held = 0;
 602                 ext4_journal_stop(handle);
 603                 handle = NULL;
 604                 ext4_truncate_failed_write(inode);
 605                 /*
 606                  * If truncate failed early the inode might
 607                  * still be on the orphan list; we need to
 608                  * make sure the inode is removed from the
 609                  * orphan list in that case.
 610                  */
 611                 if (inode->i_nlink)
 612                         ext4_orphan_del(NULL, inode);
 613         }
 614
 615         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 616                 goto retry;
 617
 618         if (page)
 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                 up_read(&EXT4_I(inode)->xattr_sem);
 816                 unlock_page(page);
 817                 page_cache_release(page);
 818                 ext4_truncate_failed_write(inode);
 819                 return ret;
 820         }
 821
 822         SetPageDirty(page);
 823         SetPageUptodate(page);
 824         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 825         *fsdata = (void *)CONVERT_INLINE_DATA;
 826
 827 out:
 828         up_read(&EXT4_I(inode)->xattr_sem);
 829         if (page) {
 830                 unlock_page(page);
 831                 page_cache_release(page);
 832         }
 833         return ret;
 834 }
 835
 836 /*
 837  * Prepare the write for the inline data.
 838  * If the the data can be written into the inode, we just read
 839  * the page and make it uptodate, and start the journal.
 840  * Otherwise read the page, makes it dirty so that it can be
 841  * handle in writepages(the i_disksize update is left to the
 842  * normal ext4_da_write_end).
 843  */
 844 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 845                                     struct inode *inode,
 846                                     loff_t pos, unsigned len,
 847                                     unsigned flags,
 848                                     struct page **pagep,
 849                                     void **fsdata)
 850 {
 851         int ret, inline_size;
 852         handle_t *handle;
 853         struct page *page;
 854         struct ext4_iloc iloc;
 855         int retries;
 856
 857         ret = ext4_get_inode_loc(inode, &iloc);
 858         if (ret)
 859                 return ret;
 860
 861 retry_journal:
 862         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 863         if (IS_ERR(handle)) {
 864                 ret = PTR_ERR(handle);
 865                 goto out;
 866         }
 867
 868         inline_size = ext4_get_max_inline_size(inode);
 869
 870         ret = -ENOSPC;
 871         if (inline_size >= pos + len) {
 872                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 873                 if (ret && ret != -ENOSPC)
 874                         goto out_journal;
 875         }
 876
 877         /*
 878          * We cannot recurse into the filesystem as the transaction
 879          * is already started.
 880          */
 881         flags |= AOP_FLAG_NOFS;
 882
 883         if (ret == -ENOSPC) {
 884                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 885                                                             inode,
 886                                                             flags,
 887                                                             fsdata);
 888                 ext4_journal_stop(handle);
 889                 if (ret == -ENOSPC &&
 890                     ext4_should_retry_alloc(inode->i_sb, &retries))
 891                         goto retry_journal;
 892                 goto out;
 893         }
 894
 895
 896         page = grab_cache_page_write_begin(mapping, 0, flags);
 897         if (!page) {
 898                 ret = -ENOMEM;
 899                 goto out_journal;
 900         }
 901
 902         down_read(&EXT4_I(inode)->xattr_sem);
 903         if (!ext4_has_inline_data(inode)) {
 904                 ret = 0;
 905                 goto out_release_page;
 906         }
 907
 908         if (!PageUptodate(page)) {
 909                 ret = ext4_read_inline_page(inode, page);
 910                 if (ret < 0)
 911                         goto out_release_page;
 912         }
 913
 914         up_read(&EXT4_I(inode)->xattr_sem);
 915         *pagep = page;
 916         brelse(iloc.bh);
 917         return 1;
 918 out_release_page:
 919         up_read(&EXT4_I(inode)->xattr_sem);
 920         unlock_page(page);
 921         page_cache_release(page);
 922 out_journal:
 923         ext4_journal_stop(handle);
 924 out:
 925         brelse(iloc.bh);
 926         return ret;
 927 }
 928
 929 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 930                                   unsigned len, unsigned copied,
 931                                   struct page *page)
 932 {
 933         int i_size_changed = 0;
 934
 935         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 936
 937         /*
 938          * No need to use i_size_read() here, the i_size
 939          * cannot change under us because we hold i_mutex.
 940          *
 941          * But it's important to update i_size while still holding page lock:
 942          * page writeout could otherwise come in and zero beyond i_size.
 943          */
 944         if (pos+copied > inode->i_size) {
 945                 i_size_write(inode, pos+copied);
 946                 i_size_changed = 1;
 947         }
 948         unlock_page(page);
 949         page_cache_release(page);
 950
 951         /*
 952          * Don't mark the inode dirty under page lock. First, it unnecessarily
 953          * makes the holding time of page lock longer. Second, it forces lock
 954          * ordering of page lock and transaction start for journaling
 955          * filesystems.
 956          */
 957         if (i_size_changed)
 958                 mark_inode_dirty(inode);
 959
 960         return copied;
 961 }
 962
 963 #ifdef INLINE_DIR_DEBUG
 964 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 965                           void *inline_start, int inline_size)
 966 {
 967         int offset;
 968         unsigned short de_len;
 969         struct ext4_dir_entry_2 *de = inline_start;
 970         void *dlimit = inline_start + inline_size;
 971
 972         trace_printk("inode %lu\n", dir->i_ino);
 973         offset = 0;
 974         while ((void *)de < dlimit) {
 975                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 976                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 977                              offset, de_len, de->name_len, de->name,
 978                              de->name_len, le32_to_cpu(de->inode));
 979                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 980                                          inline_start, inline_size, offset))
 981                         BUG();
 982
 983                 offset += de_len;
 984                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 985         }
 986 }
 987 #else
 988 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 989 #endif
 990
 991 /*
 992  * Add a new entry into a inline dir.
 993  * It will return -ENOSPC if no space is available, and -EIO
 994  * and -EEXIST if directory entry already exists.
 995  */
 996 static int ext4_add_dirent_to_inline(handle_t *handle,
 997                                      struct ext4_filename *fname,
 998                                      struct dentry *dentry,
 999                                      struct inode *inode,
1000                                      struct ext4_iloc *iloc,
1001                                      void *inline_start, int inline_size)
1002 {
1003         struct inode    *dir = d_inode(dentry->d_parent);
1004         int             err;
1005         struct ext4_dir_entry_2 *de;
1006
1007         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1008                                 inline_size, fname, &de);
1009         if (err)
1010                 return err;
1011
1012         BUFFER_TRACE(iloc->bh, "get_write_access");
1013         err = ext4_journal_get_write_access(handle, iloc->bh);
1014         if (err)
1015                 return err;
1016         ext4_insert_dentry(dir, inode, de, inline_size, fname);
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_metadata_csum(inode->i_sb))
1135                 csum_size = sizeof(struct ext4_dir_entry_tail);
1136
1137         inode->i_size = inode->i_sb->s_blocksize;
1138         i_size_write(inode, inode->i_sb->s_blocksize);
1139         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1140         ext4_update_final_de(dir_block->b_data,
1141                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1142                         inode->i_sb->s_blocksize - csum_size);
1143
1144         if (csum_size) {
1145                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1146                                      inode->i_sb->s_blocksize);
1147                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1148         }
1149         set_buffer_uptodate(dir_block);
1150         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1151         if (err)
1152                 goto out;
1153         set_buffer_verified(dir_block);
1154 out:
1155         return err;
1156 }
1157
1158 static int ext4_convert_inline_data_nolock(handle_t *handle,
1159                                            struct inode *inode,
1160                                            struct ext4_iloc *iloc)
1161 {
1162         int error;
1163         void *buf = NULL;
1164         struct buffer_head *data_bh = NULL;
1165         struct ext4_map_blocks map;
1166         int inline_size;
1167
1168         inline_size = ext4_get_inline_size(inode);
1169         buf = kmalloc(inline_size, GFP_NOFS);
1170         if (!buf) {
1171                 error = -ENOMEM;
1172                 goto out;
1173         }
1174
1175         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1176         if (error < 0)
1177                 goto out;
1178
1179         /*
1180          * Make sure the inline directory entries pass checks before we try to
1181          * convert them, so that we avoid touching stuff that needs fsck.
1182          */
1183         if (S_ISDIR(inode->i_mode)) {
1184                 error = ext4_check_all_de(inode, iloc->bh,
1185                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1186                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1187                 if (error)
1188                         goto out;
1189         }
1190
1191         error = ext4_destroy_inline_data_nolock(handle, inode);
1192         if (error)
1193                 goto out;
1194
1195         map.m_lblk = 0;
1196         map.m_len = 1;
1197         map.m_flags = 0;
1198         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1199         if (error < 0)
1200                 goto out_restore;
1201         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1202                 error = -EIO;
1203                 goto out_restore;
1204         }
1205
1206         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1207         if (!data_bh) {
1208                 error = -ENOMEM;
1209                 goto out_restore;
1210         }
1211
1212         lock_buffer(data_bh);
1213         error = ext4_journal_get_create_access(handle, data_bh);
1214         if (error) {
1215                 unlock_buffer(data_bh);
1216                 error = -EIO;
1217                 goto out_restore;
1218         }
1219         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1220
1221         if (!S_ISDIR(inode->i_mode)) {
1222                 memcpy(data_bh->b_data, buf, inline_size);
1223                 set_buffer_uptodate(data_bh);
1224                 error = ext4_handle_dirty_metadata(handle,
1225                                                    inode, data_bh);
1226         } else {
1227                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1228                                                        buf, inline_size);
1229         }
1230
1231         unlock_buffer(data_bh);
1232 out_restore:
1233         if (error)
1234                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1235
1236 out:
1237         brelse(data_bh);
1238         kfree(buf);
1239         return error;
1240 }
1241
1242 /*
1243  * Try to add the new entry to the inline data.
1244  * If succeeds, return 0. If not, extended the inline dir and copied data to
1245  * the new created block.
1246  */
1247 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1248                               struct dentry *dentry, struct inode *inode)
1249 {
1250         int ret, inline_size;
1251         void *inline_start;
1252         struct ext4_iloc iloc;
1253         struct inode *dir = d_inode(dentry->d_parent);
1254
1255         ret = ext4_get_inode_loc(dir, &iloc);
1256         if (ret)
1257                 return ret;
1258
1259         down_write(&EXT4_I(dir)->xattr_sem);
1260         if (!ext4_has_inline_data(dir))
1261                 goto out;
1262
1263         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1264                                                  EXT4_INLINE_DOTDOT_SIZE;
1265         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1266
1267         ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
1268                                         inline_start, inline_size);
1269         if (ret != -ENOSPC)
1270                 goto out;
1271
1272         /* check whether it can be inserted to inline xattr space. */
1273         inline_size = EXT4_I(dir)->i_inline_size -
1274                         EXT4_MIN_INLINE_DATA_SIZE;
1275         if (!inline_size) {
1276                 /* Try to use the xattr space.*/
1277                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1278                 if (ret && ret != -ENOSPC)
1279                         goto out;
1280
1281                 inline_size = EXT4_I(dir)->i_inline_size -
1282                                 EXT4_MIN_INLINE_DATA_SIZE;
1283         }
1284
1285         if (inline_size) {
1286                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1287
1288                 ret = ext4_add_dirent_to_inline(handle, fname, dentry,
1289                                                 inode, &iloc, inline_start,
1290                                                 inline_size);
1291
1292                 if (ret != -ENOSPC)
1293                         goto out;
1294         }
1295
1296         /*
1297          * The inline space is filled up, so create a new block for it.
1298          * As the extent tree will be created, we have to save the inline
1299          * dir first.
1300          */
1301         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1302
1303 out:
1304         ext4_mark_inode_dirty(handle, dir);
1305         up_write(&EXT4_I(dir)->xattr_sem);
1306         brelse(iloc.bh);
1307         return ret;
1308 }
1309
1310 /*
1311  * This function fills a red-black tree with information from an
1312  * inlined dir.  It returns the number directory entries loaded
1313  * into the tree.  If there is an error it is returned in err.
1314  */
1315 int htree_inlinedir_to_tree(struct file *dir_file,
1316                             struct inode *dir, ext4_lblk_t block,
1317                             struct dx_hash_info *hinfo,
1318                             __u32 start_hash, __u32 start_minor_hash,
1319                             int *has_inline_data)
1320 {
1321         int err = 0, count = 0;
1322         unsigned int parent_ino;
1323         int pos;
1324         struct ext4_dir_entry_2 *de;
1325         struct inode *inode = file_inode(dir_file);
1326         int ret, inline_size = 0;
1327         struct ext4_iloc iloc;
1328         void *dir_buf = NULL;
1329         struct ext4_dir_entry_2 fake;
1330         struct ext4_str tmp_str;
1331
1332         ret = ext4_get_inode_loc(inode, &iloc);
1333         if (ret)
1334                 return ret;
1335
1336         down_read(&EXT4_I(inode)->xattr_sem);
1337         if (!ext4_has_inline_data(inode)) {
1338                 up_read(&EXT4_I(inode)->xattr_sem);
1339                 *has_inline_data = 0;
1340                 goto out;
1341         }
1342
1343         inline_size = ext4_get_inline_size(inode);
1344         dir_buf = kmalloc(inline_size, GFP_NOFS);
1345         if (!dir_buf) {
1346                 ret = -ENOMEM;
1347                 up_read(&EXT4_I(inode)->xattr_sem);
1348                 goto out;
1349         }
1350
1351         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1352         up_read(&EXT4_I(inode)->xattr_sem);
1353         if (ret < 0)
1354                 goto out;
1355
1356         pos = 0;
1357         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1358         while (pos < inline_size) {
1359                 /*
1360                  * As inlined dir doesn't store any information about '.' and
1361                  * only the inode number of '..' is stored, we have to handle
1362                  * them differently.
1363                  */
1364                 if (pos == 0) {
1365                         fake.inode = cpu_to_le32(inode->i_ino);
1366                         fake.name_len = 1;
1367                         strcpy(fake.name, ".");
1368                         fake.rec_len = ext4_rec_len_to_disk(
1369                                                 EXT4_DIR_REC_LEN(fake.name_len),
1370                                                 inline_size);
1371                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1372                         de = &fake;
1373                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1374                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1375                         fake.inode = cpu_to_le32(parent_ino);
1376                         fake.name_len = 2;
1377                         strcpy(fake.name, "..");
1378                         fake.rec_len = ext4_rec_len_to_disk(
1379                                                 EXT4_DIR_REC_LEN(fake.name_len),
1380                                                 inline_size);
1381                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1382                         de = &fake;
1383                         pos = EXT4_INLINE_DOTDOT_SIZE;
1384                 } else {
1385                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1386                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1387                         if (ext4_check_dir_entry(inode, dir_file, de,
1388                                          iloc.bh, dir_buf,
1389                                          inline_size, pos)) {
1390                                 ret = count;
1391                                 goto out;
1392                         }
1393                 }
1394
1395                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1396                 if ((hinfo->hash < start_hash) ||
1397                     ((hinfo->hash == start_hash) &&
1398                      (hinfo->minor_hash < start_minor_hash)))
1399                         continue;
1400                 if (de->inode == 0)
1401                         continue;
1402                 tmp_str.name = de->name;
1403                 tmp_str.len = de->name_len;
1404                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1405                                               hinfo->minor_hash, de, &tmp_str);
1406                 if (err) {
1407                         count = err;
1408                         goto out;
1409                 }
1410                 count++;
1411         }
1412         ret = count;
1413 out:
1414         kfree(dir_buf);
1415         brelse(iloc.bh);
1416         return ret;
1417 }
1418
1419 /*
1420  * So this function is called when the volume is mkfsed with
1421  * dir_index disabled. In order to keep f_pos persistent
1422  * after we convert from an inlined dir to a blocked based,
1423  * we just pretend that we are a normal dir and return the
1424  * offset as if '.' and '..' really take place.
1425  *
1426  */
1427 int ext4_read_inline_dir(struct file *file,
1428                          struct dir_context *ctx,
1429                          int *has_inline_data)
1430 {
1431         unsigned int offset, parent_ino;
1432         int i;
1433         struct ext4_dir_entry_2 *de;
1434         struct super_block *sb;
1435         struct inode *inode = file_inode(file);
1436         int ret, inline_size = 0;
1437         struct ext4_iloc iloc;
1438         void *dir_buf = NULL;
1439         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1440
1441         ret = ext4_get_inode_loc(inode, &iloc);
1442         if (ret)
1443                 return ret;
1444
1445         down_read(&EXT4_I(inode)->xattr_sem);
1446         if (!ext4_has_inline_data(inode)) {
1447                 up_read(&EXT4_I(inode)->xattr_sem);
1448                 *has_inline_data = 0;
1449                 goto out;
1450         }
1451
1452         inline_size = ext4_get_inline_size(inode);
1453         dir_buf = kmalloc(inline_size, GFP_NOFS);
1454         if (!dir_buf) {
1455                 ret = -ENOMEM;
1456                 up_read(&EXT4_I(inode)->xattr_sem);
1457                 goto out;
1458         }
1459
1460         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1461         up_read(&EXT4_I(inode)->xattr_sem);
1462         if (ret < 0)
1463                 goto out;
1464
1465         ret = 0;
1466         sb = inode->i_sb;
1467         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1468         offset = ctx->pos;
1469
1470         /*
1471          * dotdot_offset and dotdot_size is the real offset and
1472          * size for ".." and "." if the dir is block based while
1473          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1474          * So we will use extra_offset and extra_size to indicate them
1475          * during the inline dir iteration.
1476          */
1477         dotdot_offset = EXT4_DIR_REC_LEN(1);
1478         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1479         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1480         extra_size = extra_offset + inline_size;
1481
1482         /*
1483          * If the version has changed since the last call to
1484          * readdir(2), then we might be pointing to an invalid
1485          * dirent right now.  Scan from the start of the inline
1486          * dir to make sure.
1487          */
1488         if (file->f_version != inode->i_version) {
1489                 for (i = 0; i < extra_size && i < offset;) {
1490                         /*
1491                          * "." is with offset 0 and
1492                          * ".." is dotdot_offset.
1493                          */
1494                         if (!i) {
1495                                 i = dotdot_offset;
1496                                 continue;
1497                         } else if (i == dotdot_offset) {
1498                                 i = dotdot_size;
1499                                 continue;
1500                         }
1501                         /* for other entry, the real offset in
1502                          * the buf has to be tuned accordingly.
1503                          */
1504                         de = (struct ext4_dir_entry_2 *)
1505                                 (dir_buf + i - extra_offset);
1506                         /* It's too expensive to do a full
1507                          * dirent test each time round this
1508                          * loop, but we do have to test at
1509                          * least that it is non-zero.  A
1510                          * failure will be detected in the
1511                          * dirent test below. */
1512                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1513                                 < EXT4_DIR_REC_LEN(1))
1514                                 break;
1515                         i += ext4_rec_len_from_disk(de->rec_len,
1516                                                     extra_size);
1517                 }
1518                 offset = i;
1519                 ctx->pos = offset;
1520                 file->f_version = inode->i_version;
1521         }
1522
1523         while (ctx->pos < extra_size) {
1524                 if (ctx->pos == 0) {
1525                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1526                                 goto out;
1527                         ctx->pos = dotdot_offset;
1528                         continue;
1529                 }
1530
1531                 if (ctx->pos == dotdot_offset) {
1532                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1533                                 goto out;
1534                         ctx->pos = dotdot_size;
1535                         continue;
1536                 }
1537
1538                 de = (struct ext4_dir_entry_2 *)
1539                         (dir_buf + ctx->pos - extra_offset);
1540                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1541                                          extra_size, ctx->pos))
1542                         goto out;
1543                 if (le32_to_cpu(de->inode)) {
1544                         if (!dir_emit(ctx, de->name, de->name_len,
1545                                       le32_to_cpu(de->inode),
1546                                       get_dtype(sb, de->file_type)))
1547                                 goto out;
1548                 }
1549                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1550         }
1551 out:
1552         kfree(dir_buf);
1553         brelse(iloc.bh);
1554         return ret;
1555 }
1556
1557 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1558                                         struct ext4_dir_entry_2 **parent_de,
1559                                         int *retval)
1560 {
1561         struct ext4_iloc iloc;
1562
1563         *retval = ext4_get_inode_loc(inode, &iloc);
1564         if (*retval)
1565                 return NULL;
1566
1567         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1568
1569         return iloc.bh;
1570 }
1571
1572 /*
1573  * Try to create the inline data for the new dir.
1574  * If it succeeds, return 0, otherwise return the error.
1575  * In case of ENOSPC, the caller should create the normal disk layout dir.
1576  */
1577 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1578                                struct inode *inode)
1579 {
1580         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1581         struct ext4_iloc iloc;
1582         struct ext4_dir_entry_2 *de;
1583
1584         ret = ext4_get_inode_loc(inode, &iloc);
1585         if (ret)
1586                 return ret;
1587
1588         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1589         if (ret)
1590                 goto out;
1591
1592         /*
1593          * For inline dir, we only save the inode information for the ".."
1594          * and create a fake dentry to cover the left space.
1595          */
1596         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1597         de->inode = cpu_to_le32(parent->i_ino);
1598         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1599         de->inode = 0;
1600         de->rec_len = ext4_rec_len_to_disk(
1601                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1602                                 inline_size);
1603         set_nlink(inode, 2);
1604         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1605 out:
1606         brelse(iloc.bh);
1607         return ret;
1608 }
1609
1610 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1611                                         struct ext4_filename *fname,
1612                                         const struct qstr *d_name,
1613                                         struct ext4_dir_entry_2 **res_dir,
1614                                         int *has_inline_data)
1615 {
1616         int ret;
1617         struct ext4_iloc iloc;
1618         void *inline_start;
1619         int inline_size;
1620
1621         if (ext4_get_inode_loc(dir, &iloc))
1622                 return NULL;
1623
1624         down_read(&EXT4_I(dir)->xattr_sem);
1625         if (!ext4_has_inline_data(dir)) {
1626                 *has_inline_data = 0;
1627                 goto out;
1628         }
1629
1630         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1631                                                 EXT4_INLINE_DOTDOT_SIZE;
1632         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1633         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1634                               dir, fname, d_name, 0, res_dir);
1635         if (ret == 1)
1636                 goto out_find;
1637         if (ret < 0)
1638                 goto out;
1639
1640         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1641                 goto out;
1642
1643         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1644         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1645
1646         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1647                               dir, fname, d_name, 0, res_dir);
1648         if (ret == 1)
1649                 goto out_find;
1650
1651 out:
1652         brelse(iloc.bh);
1653         iloc.bh = NULL;
1654 out_find:
1655         up_read(&EXT4_I(dir)->xattr_sem);
1656         return iloc.bh;
1657 }
1658
1659 int ext4_delete_inline_entry(handle_t *handle,
1660                              struct inode *dir,
1661                              struct ext4_dir_entry_2 *de_del,
1662                              struct buffer_head *bh,
1663                              int *has_inline_data)
1664 {
1665         int err, inline_size;
1666         struct ext4_iloc iloc;
1667         void *inline_start;
1668
1669         err = ext4_get_inode_loc(dir, &iloc);
1670         if (err)
1671                 return err;
1672
1673         down_write(&EXT4_I(dir)->xattr_sem);
1674         if (!ext4_has_inline_data(dir)) {
1675                 *has_inline_data = 0;
1676                 goto out;
1677         }
1678
1679         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1680                 EXT4_MIN_INLINE_DATA_SIZE) {
1681                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1682                                         EXT4_INLINE_DOTDOT_SIZE;
1683                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1684                                 EXT4_INLINE_DOTDOT_SIZE;
1685         } else {
1686                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1687                 inline_size = ext4_get_inline_size(dir) -
1688                                 EXT4_MIN_INLINE_DATA_SIZE;
1689         }
1690
1691         BUFFER_TRACE(bh, "get_write_access");
1692         err = ext4_journal_get_write_access(handle, bh);
1693         if (err)
1694                 goto out;
1695
1696         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1697                                         inline_start, inline_size, 0);
1698         if (err)
1699                 goto out;
1700
1701         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1702         err = ext4_mark_inode_dirty(handle, dir);
1703         if (unlikely(err))
1704                 goto out;
1705
1706         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1707 out:
1708         up_write(&EXT4_I(dir)->xattr_sem);
1709         brelse(iloc.bh);
1710         if (err != -ENOENT)
1711                 ext4_std_error(dir->i_sb, err);
1712         return err;
1713 }
1714
1715 /*
1716  * Get the inline dentry at offset.
1717  */
1718 static inline struct ext4_dir_entry_2 *
1719 ext4_get_inline_entry(struct inode *inode,
1720                       struct ext4_iloc *iloc,
1721                       unsigned int offset,
1722                       void **inline_start,
1723                       int *inline_size)
1724 {
1725         void *inline_pos;
1726
1727         BUG_ON(offset > ext4_get_inline_size(inode));
1728
1729         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1730                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1731                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1732         } else {
1733                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1734                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1735                 *inline_size = ext4_get_inline_size(inode) -
1736                                 EXT4_MIN_INLINE_DATA_SIZE;
1737         }
1738
1739         if (inline_start)
1740                 *inline_start = inline_pos;
1741         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1742 }
1743
1744 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1745 {
1746         int err, inline_size;
1747         struct ext4_iloc iloc;
1748         void *inline_pos;
1749         unsigned int offset;
1750         struct ext4_dir_entry_2 *de;
1751         int ret = 1;
1752
1753         err = ext4_get_inode_loc(dir, &iloc);
1754         if (err) {
1755                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1756                                  err, dir->i_ino);
1757                 return 1;
1758         }
1759
1760         down_read(&EXT4_I(dir)->xattr_sem);
1761         if (!ext4_has_inline_data(dir)) {
1762                 *has_inline_data = 0;
1763                 goto out;
1764         }
1765
1766         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1767         if (!le32_to_cpu(de->inode)) {
1768                 ext4_warning(dir->i_sb,
1769                              "bad inline directory (dir #%lu) - no `..'",
1770                              dir->i_ino);
1771                 ret = 1;
1772                 goto out;
1773         }
1774
1775         offset = EXT4_INLINE_DOTDOT_SIZE;
1776         while (offset < dir->i_size) {
1777                 de = ext4_get_inline_entry(dir, &iloc, offset,
1778                                            &inline_pos, &inline_size);
1779                 if (ext4_check_dir_entry(dir, NULL, de,
1780                                          iloc.bh, inline_pos,
1781                                          inline_size, offset)) {
1782                         ext4_warning(dir->i_sb,
1783                                      "bad inline directory (dir #%lu) - "
1784                                      "inode %u, rec_len %u, name_len %d"
1785                                      "inline size %d\n",
1786                                      dir->i_ino, le32_to_cpu(de->inode),
1787                                      le16_to_cpu(de->rec_len), de->name_len,
1788                                      inline_size);
1789                         ret = 1;
1790                         goto out;
1791                 }
1792                 if (le32_to_cpu(de->inode)) {
1793                         ret = 0;
1794                         goto out;
1795                 }
1796                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1797         }
1798
1799 out:
1800         up_read(&EXT4_I(dir)->xattr_sem);
1801         brelse(iloc.bh);
1802         return ret;
1803 }
1804
1805 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1806 {
1807         int ret;
1808
1809         down_write(&EXT4_I(inode)->xattr_sem);
1810         ret = ext4_destroy_inline_data_nolock(handle, inode);
1811         up_write(&EXT4_I(inode)->xattr_sem);
1812
1813         return ret;
1814 }
1815
1816 int ext4_inline_data_fiemap(struct inode *inode,
1817                             struct fiemap_extent_info *fieinfo,
1818                             int *has_inline, __u64 start, __u64 len)
1819 {
1820         __u64 physical = 0;
1821         __u64 inline_len;
1822         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1823                 FIEMAP_EXTENT_LAST;
1824         int error = 0;
1825         struct ext4_iloc iloc;
1826
1827         down_read(&EXT4_I(inode)->xattr_sem);
1828         if (!ext4_has_inline_data(inode)) {
1829                 *has_inline = 0;
1830                 goto out;
1831         }
1832         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1833                            i_size_read(inode));
1834         if (start >= inline_len)
1835                 goto out;
1836         if (start + len < inline_len)
1837                 inline_len = start + len;
1838         inline_len -= start;
1839
1840         error = ext4_get_inode_loc(inode, &iloc);
1841         if (error)
1842                 goto out;
1843
1844         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1845         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1846         physical += offsetof(struct ext4_inode, i_block);
1847
1848         if (physical)
1849                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1850                                                 inline_len, flags);
1851         brelse(iloc.bh);
1852 out:
1853         up_read(&EXT4_I(inode)->xattr_sem);
1854         return (error < 0 ? error : 0);
1855 }
1856
1857 /*
1858  * Called during xattr set, and if we can sparse space 'needed',
1859  * just create the extent tree evict the data to the outer block.
1860  *
1861  * We use jbd2 instead of page cache to move data to the 1st block
1862  * so that the whole transaction can be committed as a whole and
1863  * the data isn't lost because of the delayed page cache write.
1864  */
1865 int ext4_try_to_evict_inline_data(handle_t *handle,
1866                                   struct inode *inode,
1867                                   int needed)
1868 {
1869         int error;
1870         struct ext4_xattr_entry *entry;
1871         struct ext4_inode *raw_inode;
1872         struct ext4_iloc iloc;
1873
1874         error = ext4_get_inode_loc(inode, &iloc);
1875         if (error)
1876                 return error;
1877
1878         raw_inode = ext4_raw_inode(&iloc);
1879         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1880                                             EXT4_I(inode)->i_inline_off);
1881         if (EXT4_XATTR_LEN(entry->e_name_len) +
1882             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1883                 error = -ENOSPC;
1884                 goto out;
1885         }
1886
1887         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1888 out:
1889         brelse(iloc.bh);
1890         return error;
1891 }
1892
1893 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1894 {
1895         handle_t *handle;
1896         int inline_size, value_len, needed_blocks;
1897         size_t i_size;
1898         void *value = NULL;
1899         struct ext4_xattr_ibody_find is = {
1900                 .s = { .not_found = -ENODATA, },
1901         };
1902         struct ext4_xattr_info i = {
1903                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1904                 .name = EXT4_XATTR_SYSTEM_DATA,
1905         };
1906
1907
1908         needed_blocks = ext4_writepage_trans_blocks(inode);
1909         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1910         if (IS_ERR(handle))
1911                 return;
1912
1913         down_write(&EXT4_I(inode)->xattr_sem);
1914         if (!ext4_has_inline_data(inode)) {
1915                 *has_inline = 0;
1916                 ext4_journal_stop(handle);
1917                 return;
1918         }
1919
1920         if (ext4_orphan_add(handle, inode))
1921                 goto out;
1922
1923         if (ext4_get_inode_loc(inode, &is.iloc))
1924                 goto out;
1925
1926         down_write(&EXT4_I(inode)->i_data_sem);
1927         i_size = inode->i_size;
1928         inline_size = ext4_get_inline_size(inode);
1929         EXT4_I(inode)->i_disksize = i_size;
1930
1931         if (i_size < inline_size) {
1932                 /* Clear the content in the xattr space. */
1933                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1934                         if (ext4_xattr_ibody_find(inode, &i, &is))
1935                                 goto out_error;
1936
1937                         BUG_ON(is.s.not_found);
1938
1939                         value_len = le32_to_cpu(is.s.here->e_value_size);
1940                         value = kmalloc(value_len, GFP_NOFS);
1941                         if (!value)
1942                                 goto out_error;
1943
1944                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1945                                                 value, value_len))
1946                                 goto out_error;
1947
1948                         i.value = value;
1949                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1950                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1951                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1952                                 goto out_error;
1953                 }
1954
1955                 /* Clear the content within i_blocks. */
1956                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1957                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1958                         memset(p + i_size, 0,
1959                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1960                 }
1961
1962                 EXT4_I(inode)->i_inline_size = i_size <
1963                                         EXT4_MIN_INLINE_DATA_SIZE ?
1964                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1965         }
1966
1967 out_error:
1968         up_write(&EXT4_I(inode)->i_data_sem);
1969 out:
1970         brelse(is.iloc.bh);
1971         up_write(&EXT4_I(inode)->xattr_sem);
1972         kfree(value);
1973         if (inode->i_nlink)
1974                 ext4_orphan_del(handle, inode);
1975
1976         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1977         ext4_mark_inode_dirty(handle, inode);
1978         if (IS_SYNC(inode))
1979                 ext4_handle_sync(handle);
1980
1981         ext4_journal_stop(handle);
1982         return;
1983 }
1984
1985 int ext4_convert_inline_data(struct inode *inode)
1986 {
1987         int error, needed_blocks;
1988         handle_t *handle;
1989         struct ext4_iloc iloc;
1990
1991         if (!ext4_has_inline_data(inode)) {
1992                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1993                 return 0;
1994         }
1995
1996         needed_blocks = ext4_writepage_trans_blocks(inode);
1997
1998         iloc.bh = NULL;
1999         error = ext4_get_inode_loc(inode, &iloc);
2000         if (error)
2001                 return error;
2002
2003         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2004         if (IS_ERR(handle)) {
2005                 error = PTR_ERR(handle);
2006                 goto out_free;
2007         }
2008
2009         down_write(&EXT4_I(inode)->xattr_sem);
2010         if (!ext4_has_inline_data(inode)) {
2011                 up_write(&EXT4_I(inode)->xattr_sem);
2012                 goto out;
2013         }
2014
2015         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2016         up_write(&EXT4_I(inode)->xattr_sem);
2017 out:
2018         ext4_journal_stop(handle);
2019 out_free:
2020         brelse(iloc.bh);
2021         return error;
2022 }