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                 error = -ENOMEM;
 341                 goto out;
 342         }
 343
 344         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 345                                      value, len);
 346         if (error == -ENODATA)
 347                 goto out;
 348
 349         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 350         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 351         if (error)
 352                 goto out;
 353
 354         /* Update the xttr entry. */
 355         i.value = value;
 356         i.value_len = len;
 357
 358         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 359         if (error)
 360                 goto out;
 361
 362         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 363                                       (void *)ext4_raw_inode(&is.iloc));
 364         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 365                                 le32_to_cpu(is.s.here->e_value_size);
 366         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 367         get_bh(is.iloc.bh);
 368         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 369
 370 out:
 371         kfree(value);
 372         brelse(is.iloc.bh);
 373         return error;
 374 }
 375
 376 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 377                                     unsigned int len)
 378 {
 379         int ret, size;
 380         struct ext4_inode_info *ei = EXT4_I(inode);
 381
 382         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 383                 return -ENOSPC;
 384
 385         size = ext4_get_max_inline_size(inode);
 386         if (size < len)
 387                 return -ENOSPC;
 388
 389         down_write(&EXT4_I(inode)->xattr_sem);
 390
 391         if (ei->i_inline_off)
 392                 ret = ext4_update_inline_data(handle, inode, len);
 393         else
 394                 ret = ext4_create_inline_data(handle, inode, len);
 395
 396         up_write(&EXT4_I(inode)->xattr_sem);
 397
 398         return ret;
 399 }
 400
 401 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 402                                            struct inode *inode)
 403 {
 404         struct ext4_inode_info *ei = EXT4_I(inode);
 405         struct ext4_xattr_ibody_find is = {
 406                 .s = { .not_found = 0, },
 407         };
 408         struct ext4_xattr_info i = {
 409                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 410                 .name = EXT4_XATTR_SYSTEM_DATA,
 411                 .value = NULL,
 412                 .value_len = 0,
 413         };
 414         int error;
 415
 416         if (!ei->i_inline_off)
 417                 return 0;
 418
 419         error = ext4_get_inode_loc(inode, &is.iloc);
 420         if (error)
 421                 return error;
 422
 423         error = ext4_xattr_ibody_find(inode, &i, &is);
 424         if (error)
 425                 goto out;
 426
 427         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 428         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 429         if (error)
 430                 goto out;
 431
 432         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 433         if (error)
 434                 goto out;
 435
 436         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 437                 0, EXT4_MIN_INLINE_DATA_SIZE);
 438
 439         if (ext4_has_feature_extents(inode->i_sb)) {
 440                 if (S_ISDIR(inode->i_mode) ||
 441                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 442                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 443                         ext4_ext_tree_init(handle, inode);
 444                 }
 445         }
 446         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 447
 448         get_bh(is.iloc.bh);
 449         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 450
 451         EXT4_I(inode)->i_inline_off = 0;
 452         EXT4_I(inode)->i_inline_size = 0;
 453         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 454 out:
 455         brelse(is.iloc.bh);
 456         if (error == -ENODATA)
 457                 error = 0;
 458         return error;
 459 }
 460
 461 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 462 {
 463         void *kaddr;
 464         int ret = 0;
 465         size_t len;
 466         struct ext4_iloc iloc;
 467
 468         BUG_ON(!PageLocked(page));
 469         BUG_ON(!ext4_has_inline_data(inode));
 470         BUG_ON(page->index);
 471
 472         if (!EXT4_I(inode)->i_inline_off) {
 473                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 474                              inode->i_ino);
 475                 goto out;
 476         }
 477
 478         ret = ext4_get_inode_loc(inode, &iloc);
 479         if (ret)
 480                 goto out;
 481
 482         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 483         kaddr = kmap_atomic(page);
 484         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 485         flush_dcache_page(page);
 486         kunmap_atomic(kaddr);
 487         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 488         SetPageUptodate(page);
 489         brelse(iloc.bh);
 490
 491 out:
 492         return ret;
 493 }
 494
 495 int ext4_readpage_inline(struct inode *inode, struct page *page)
 496 {
 497         int ret = 0;
 498
 499         down_read(&EXT4_I(inode)->xattr_sem);
 500         if (!ext4_has_inline_data(inode)) {
 501                 up_read(&EXT4_I(inode)->xattr_sem);
 502                 return -EAGAIN;
 503         }
 504
 505         /*
 506          * Current inline data can only exist in the 1st page,
 507          * So for all the other pages, just set them uptodate.
 508          */
 509         if (!page->index)
 510                 ret = ext4_read_inline_page(inode, page);
 511         else if (!PageUptodate(page)) {
 512                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 513                 SetPageUptodate(page);
 514         }
 515
 516         up_read(&EXT4_I(inode)->xattr_sem);
 517
 518         unlock_page(page);
 519         return ret >= 0 ? 0 : ret;
 520 }
 521
 522 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 523                                               struct inode *inode,
 524                                               unsigned flags)
 525 {
 526         int ret, needed_blocks;
 527         handle_t *handle = NULL;
 528         int retries = 0, sem_held = 0;
 529         struct page *page = NULL;
 530         unsigned from, to;
 531         struct ext4_iloc iloc;
 532
 533         if (!ext4_has_inline_data(inode)) {
 534                 /*
 535                  * clear the flag so that no new write
 536                  * will trap here again.
 537                  */
 538                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 539                 return 0;
 540         }
 541
 542         needed_blocks = ext4_writepage_trans_blocks(inode);
 543
 544         ret = ext4_get_inode_loc(inode, &iloc);
 545         if (ret)
 546                 return ret;
 547
 548 retry:
 549         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 550         if (IS_ERR(handle)) {
 551                 ret = PTR_ERR(handle);
 552                 handle = NULL;
 553                 goto out;
 554         }
 555
 556         /* We cannot recurse into the filesystem as the transaction is already
 557          * started */
 558         flags |= AOP_FLAG_NOFS;
 559
 560         page = grab_cache_page_write_begin(mapping, 0, flags);
 561         if (!page) {
 562                 ret = -ENOMEM;
 563                 goto out;
 564         }
 565
 566         down_write(&EXT4_I(inode)->xattr_sem);
 567         sem_held = 1;
 568         /* If some one has already done this for us, just exit. */
 569         if (!ext4_has_inline_data(inode)) {
 570                 ret = 0;
 571                 goto out;
 572         }
 573
 574         from = 0;
 575         to = ext4_get_inline_size(inode);
 576         if (!PageUptodate(page)) {
 577                 ret = ext4_read_inline_page(inode, page);
 578                 if (ret < 0)
 579                         goto out;
 580         }
 581
 582         ret = ext4_destroy_inline_data_nolock(handle, inode);
 583         if (ret)
 584                 goto out;
 585
 586         if (ext4_should_dioread_nolock(inode))
 587                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 588         else
 589                 ret = __block_write_begin(page, from, to, ext4_get_block);
 590
 591         if (!ret && ext4_should_journal_data(inode)) {
 592                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 593                                              from, to, NULL,
 594                                              do_journal_get_write_access);
 595         }
 596
 597         if (ret) {
 598                 unlock_page(page);
 599                 page_cache_release(page);
 600                 page = NULL;
 601                 ext4_orphan_add(handle, inode);
 602                 up_write(&EXT4_I(inode)->xattr_sem);
 603                 sem_held = 0;
 604                 ext4_journal_stop(handle);
 605                 handle = NULL;
 606                 ext4_truncate_failed_write(inode);
 607                 /*
 608                  * If truncate failed early the inode might
 609                  * still be on the orphan list; we need to
 610                  * make sure the inode is removed from the
 611                  * orphan list in that case.
 612                  */
 613                 if (inode->i_nlink)
 614                         ext4_orphan_del(NULL, inode);
 615         }
 616
 617         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 618                 goto retry;
 619
 620         if (page)
 621                 block_commit_write(page, from, to);
 622 out:
 623         if (page) {
 624                 unlock_page(page);
 625                 page_cache_release(page);
 626         }
 627         if (sem_held)
 628                 up_write(&EXT4_I(inode)->xattr_sem);
 629         if (handle)
 630                 ext4_journal_stop(handle);
 631         brelse(iloc.bh);
 632         return ret;
 633 }
 634
 635 /*
 636  * Try to write data in the inode.
 637  * If the inode has inline data, check whether the new write can be
 638  * in the inode also. If not, create the page the handle, move the data
 639  * to the page make it update and let the later codes create extent for it.
 640  */
 641 int ext4_try_to_write_inline_data(struct address_space *mapping,
 642                                   struct inode *inode,
 643                                   loff_t pos, unsigned len,
 644                                   unsigned flags,
 645                                   struct page **pagep)
 646 {
 647         int ret;
 648         handle_t *handle;
 649         struct page *page;
 650         struct ext4_iloc iloc;
 651
 652         if (pos + len > ext4_get_max_inline_size(inode))
 653                 goto convert;
 654
 655         ret = ext4_get_inode_loc(inode, &iloc);
 656         if (ret)
 657                 return ret;
 658
 659         /*
 660          * The possible write could happen in the inode,
 661          * so try to reserve the space in inode first.
 662          */
 663         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 664         if (IS_ERR(handle)) {
 665                 ret = PTR_ERR(handle);
 666                 handle = NULL;
 667                 goto out;
 668         }
 669
 670         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 671         if (ret && ret != -ENOSPC)
 672                 goto out;
 673
 674         /* We don't have space in inline inode, so convert it to extent. */
 675         if (ret == -ENOSPC) {
 676                 ext4_journal_stop(handle);
 677                 brelse(iloc.bh);
 678                 goto convert;
 679         }
 680
 681         flags |= AOP_FLAG_NOFS;
 682
 683         page = grab_cache_page_write_begin(mapping, 0, flags);
 684         if (!page) {
 685                 ret = -ENOMEM;
 686                 goto out;
 687         }
 688
 689         *pagep = page;
 690         down_read(&EXT4_I(inode)->xattr_sem);
 691         if (!ext4_has_inline_data(inode)) {
 692                 ret = 0;
 693                 unlock_page(page);
 694                 page_cache_release(page);
 695                 goto out_up_read;
 696         }
 697
 698         if (!PageUptodate(page)) {
 699                 ret = ext4_read_inline_page(inode, page);
 700                 if (ret < 0)
 701                         goto out_up_read;
 702         }
 703
 704         ret = 1;
 705         handle = NULL;
 706 out_up_read:
 707         up_read(&EXT4_I(inode)->xattr_sem);
 708 out:
 709         if (handle)
 710                 ext4_journal_stop(handle);
 711         brelse(iloc.bh);
 712         return ret;
 713 convert:
 714         return ext4_convert_inline_data_to_extent(mapping,
 715                                                   inode, flags);
 716 }
 717
 718 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 719                                unsigned copied, struct page *page)
 720 {
 721         int ret;
 722         void *kaddr;
 723         struct ext4_iloc iloc;
 724
 725         if (unlikely(copied < len)) {
 726                 if (!PageUptodate(page)) {
 727                         copied = 0;
 728                         goto out;
 729                 }
 730         }
 731
 732         ret = ext4_get_inode_loc(inode, &iloc);
 733         if (ret) {
 734                 ext4_std_error(inode->i_sb, ret);
 735                 copied = 0;
 736                 goto out;
 737         }
 738
 739         down_write(&EXT4_I(inode)->xattr_sem);
 740         BUG_ON(!ext4_has_inline_data(inode));
 741
 742         kaddr = kmap_atomic(page);
 743         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 744         kunmap_atomic(kaddr);
 745         SetPageUptodate(page);
 746         /* clear page dirty so that writepages wouldn't work for us. */
 747         ClearPageDirty(page);
 748
 749         up_write(&EXT4_I(inode)->xattr_sem);
 750         brelse(iloc.bh);
 751 out:
 752         return copied;
 753 }
 754
 755 struct buffer_head *
 756 ext4_journalled_write_inline_data(struct inode *inode,
 757                                   unsigned len,
 758                                   struct page *page)
 759 {
 760         int ret;
 761         void *kaddr;
 762         struct ext4_iloc iloc;
 763
 764         ret = ext4_get_inode_loc(inode, &iloc);
 765         if (ret) {
 766                 ext4_std_error(inode->i_sb, ret);
 767                 return NULL;
 768         }
 769
 770         down_write(&EXT4_I(inode)->xattr_sem);
 771         kaddr = kmap_atomic(page);
 772         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 773         kunmap_atomic(kaddr);
 774         up_write(&EXT4_I(inode)->xattr_sem);
 775
 776         return iloc.bh;
 777 }
 778
 779 /*
 780  * Try to make the page cache and handle ready for the inline data case.
 781  * We can call this function in 2 cases:
 782  * 1. The inode is created and the first write exceeds inline size. We can
 783  *    clear the inode state safely.
 784  * 2. The inode has inline data, then we need to read the data, make it
 785  *    update and dirty so that ext4_da_writepages can handle it. We don't
 786  *    need to start the journal since the file's metatdata isn't changed now.
 787  */
 788 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 789                                                  struct inode *inode,
 790                                                  unsigned flags,
 791                                                  void **fsdata)
 792 {
 793         int ret = 0, inline_size;
 794         struct page *page;
 795
 796         page = grab_cache_page_write_begin(mapping, 0, flags);
 797         if (!page)
 798                 return -ENOMEM;
 799
 800         down_read(&EXT4_I(inode)->xattr_sem);
 801         if (!ext4_has_inline_data(inode)) {
 802                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 803                 goto out;
 804         }
 805
 806         inline_size = ext4_get_inline_size(inode);
 807
 808         if (!PageUptodate(page)) {
 809                 ret = ext4_read_inline_page(inode, page);
 810                 if (ret < 0)
 811                         goto out;
 812         }
 813
 814         ret = __block_write_begin(page, 0, inline_size,
 815                                   ext4_da_get_block_prep);
 816         if (ret) {
 817                 up_read(&EXT4_I(inode)->xattr_sem);
 818                 unlock_page(page);
 819                 page_cache_release(page);
 820                 ext4_truncate_failed_write(inode);
 821                 return ret;
 822         }
 823
 824         SetPageDirty(page);
 825         SetPageUptodate(page);
 826         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 827         *fsdata = (void *)CONVERT_INLINE_DATA;
 828
 829 out:
 830         up_read(&EXT4_I(inode)->xattr_sem);
 831         if (page) {
 832                 unlock_page(page);
 833                 page_cache_release(page);
 834         }
 835         return ret;
 836 }
 837
 838 /*
 839  * Prepare the write for the inline data.
 840  * If the the data can be written into the inode, we just read
 841  * the page and make it uptodate, and start the journal.
 842  * Otherwise read the page, makes it dirty so that it can be
 843  * handle in writepages(the i_disksize update is left to the
 844  * normal ext4_da_write_end).
 845  */
 846 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 847                                     struct inode *inode,
 848                                     loff_t pos, unsigned len,
 849                                     unsigned flags,
 850                                     struct page **pagep,
 851                                     void **fsdata)
 852 {
 853         int ret, inline_size;
 854         handle_t *handle;
 855         struct page *page;
 856         struct ext4_iloc iloc;
 857         int retries;
 858
 859         ret = ext4_get_inode_loc(inode, &iloc);
 860         if (ret)
 861                 return ret;
 862
 863 retry_journal:
 864         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 865         if (IS_ERR(handle)) {
 866                 ret = PTR_ERR(handle);
 867                 goto out;
 868         }
 869
 870         inline_size = ext4_get_max_inline_size(inode);
 871
 872         ret = -ENOSPC;
 873         if (inline_size >= pos + len) {
 874                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 875                 if (ret && ret != -ENOSPC)
 876                         goto out_journal;
 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         if (ret == -ENOSPC) {
 886                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 887                                                             inode,
 888                                                             flags,
 889                                                             fsdata);
 890                 ext4_journal_stop(handle);
 891                 if (ret == -ENOSPC &&
 892                     ext4_should_retry_alloc(inode->i_sb, &retries))
 893                         goto retry_journal;
 894                 goto out;
 895         }
 896
 897
 898         page = grab_cache_page_write_begin(mapping, 0, flags);
 899         if (!page) {
 900                 ret = -ENOMEM;
 901                 goto out_journal;
 902         }
 903
 904         down_read(&EXT4_I(inode)->xattr_sem);
 905         if (!ext4_has_inline_data(inode)) {
 906                 ret = 0;
 907                 goto out_release_page;
 908         }
 909
 910         if (!PageUptodate(page)) {
 911                 ret = ext4_read_inline_page(inode, page);
 912                 if (ret < 0)
 913                         goto out_release_page;
 914         }
 915
 916         up_read(&EXT4_I(inode)->xattr_sem);
 917         *pagep = page;
 918         brelse(iloc.bh);
 919         return 1;
 920 out_release_page:
 921         up_read(&EXT4_I(inode)->xattr_sem);
 922         unlock_page(page);
 923         page_cache_release(page);
 924 out_journal:
 925         ext4_journal_stop(handle);
 926 out:
 927         brelse(iloc.bh);
 928         return ret;
 929 }
 930
 931 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 932                                   unsigned len, unsigned copied,
 933                                   struct page *page)
 934 {
 935         int i_size_changed = 0;
 936         int ret;
 937
 938         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 939         if (ret < 0) {
 940                 unlock_page(page);
 941                 put_page(page);
 942                 return ret;
 943         }
 944         copied = ret;
 945
 946         /*
 947          * No need to use i_size_read() here, the i_size
 948          * cannot change under us because we hold i_mutex.
 949          *
 950          * But it's important to update i_size while still holding page lock:
 951          * page writeout could otherwise come in and zero beyond i_size.
 952          */
 953         if (pos+copied > inode->i_size) {
 954                 i_size_write(inode, pos+copied);
 955                 i_size_changed = 1;
 956         }
 957         unlock_page(page);
 958         page_cache_release(page);
 959
 960         /*
 961          * Don't mark the inode dirty under page lock. First, it unnecessarily
 962          * makes the holding time of page lock longer. Second, it forces lock
 963          * ordering of page lock and transaction start for journaling
 964          * filesystems.
 965          */
 966         if (i_size_changed)
 967                 mark_inode_dirty(inode);
 968
 969         return copied;
 970 }
 971
 972 #ifdef INLINE_DIR_DEBUG
 973 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 974                           void *inline_start, int inline_size)
 975 {
 976         int offset;
 977         unsigned short de_len;
 978         struct ext4_dir_entry_2 *de = inline_start;
 979         void *dlimit = inline_start + inline_size;
 980
 981         trace_printk("inode %lu\n", dir->i_ino);
 982         offset = 0;
 983         while ((void *)de < dlimit) {
 984                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 985                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 986                              offset, de_len, de->name_len, de->name,
 987                              de->name_len, le32_to_cpu(de->inode));
 988                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 989                                          inline_start, inline_size, offset))
 990                         BUG();
 991
 992                 offset += de_len;
 993                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 994         }
 995 }
 996 #else
 997 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 998 #endif
 999
1000 /*
1001  * Add a new entry into a inline dir.
1002  * It will return -ENOSPC if no space is available, and -EIO
1003  * and -EEXIST if directory entry already exists.
1004  */
1005 static int ext4_add_dirent_to_inline(handle_t *handle,
1006                                      struct ext4_filename *fname,
1007                                      struct dentry *dentry,
1008                                      struct inode *inode,
1009                                      struct ext4_iloc *iloc,
1010                                      void *inline_start, int inline_size)
1011 {
1012         struct inode    *dir = d_inode(dentry->d_parent);
1013         int             err;
1014         struct ext4_dir_entry_2 *de;
1015
1016         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1017                                 inline_size, fname, &de);
1018         if (err)
1019                 return err;
1020
1021         BUFFER_TRACE(iloc->bh, "get_write_access");
1022         err = ext4_journal_get_write_access(handle, iloc->bh);
1023         if (err)
1024                 return err;
1025         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1026
1027         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1028
1029         /*
1030          * XXX shouldn't update any times until successful
1031          * completion of syscall, but too many callers depend
1032          * on this.
1033          *
1034          * XXX similarly, too many callers depend on
1035          * ext4_new_inode() setting the times, but error
1036          * recovery deletes the inode, so the worst that can
1037          * happen is that the times are slightly out of date
1038          * and/or different from the directory change time.
1039          */
1040         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1041         ext4_update_dx_flag(dir);
1042         dir->i_version++;
1043         ext4_mark_inode_dirty(handle, dir);
1044         return 1;
1045 }
1046
1047 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1048                                        struct ext4_iloc *iloc)
1049 {
1050         struct ext4_xattr_entry *entry;
1051         struct ext4_xattr_ibody_header *header;
1052
1053         BUG_ON(!EXT4_I(inode)->i_inline_off);
1054
1055         header = IHDR(inode, ext4_raw_inode(iloc));
1056         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1057                                             EXT4_I(inode)->i_inline_off);
1058
1059         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1060 }
1061
1062 /* Set the final de to cover the whole block. */
1063 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1064 {
1065         struct ext4_dir_entry_2 *de, *prev_de;
1066         void *limit;
1067         int de_len;
1068
1069         de = (struct ext4_dir_entry_2 *)de_buf;
1070         if (old_size) {
1071                 limit = de_buf + old_size;
1072                 do {
1073                         prev_de = de;
1074                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1075                         de_buf += de_len;
1076                         de = (struct ext4_dir_entry_2 *)de_buf;
1077                 } while (de_buf < limit);
1078
1079                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1080                                                         old_size, new_size);
1081         } else {
1082                 /* this is just created, so create an empty entry. */
1083                 de->inode = 0;
1084                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1085         }
1086 }
1087
1088 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1089                                   struct ext4_iloc *iloc)
1090 {
1091         int ret;
1092         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1093         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1094
1095         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1096                 return -ENOSPC;
1097
1098         ret = ext4_update_inline_data(handle, dir,
1099                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1100         if (ret)
1101                 return ret;
1102
1103         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1104                              EXT4_I(dir)->i_inline_size -
1105                                                 EXT4_MIN_INLINE_DATA_SIZE);
1106         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1107         return 0;
1108 }
1109
1110 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1111                                      struct ext4_iloc *iloc,
1112                                      void *buf, int inline_size)
1113 {
1114         ext4_create_inline_data(handle, inode, inline_size);
1115         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1116         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1117 }
1118
1119 static int ext4_finish_convert_inline_dir(handle_t *handle,
1120                                           struct inode *inode,
1121                                           struct buffer_head *dir_block,
1122                                           void *buf,
1123                                           int inline_size)
1124 {
1125         int err, csum_size = 0, header_size = 0;
1126         struct ext4_dir_entry_2 *de;
1127         struct ext4_dir_entry_tail *t;
1128         void *target = dir_block->b_data;
1129
1130         /*
1131          * First create "." and ".." and then copy the dir information
1132          * back to the block.
1133          */
1134         de = (struct ext4_dir_entry_2 *)target;
1135         de = ext4_init_dot_dotdot(inode, de,
1136                 inode->i_sb->s_blocksize, csum_size,
1137                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1138         header_size = (void *)de - target;
1139
1140         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1141                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1142
1143         if (ext4_has_metadata_csum(inode->i_sb))
1144                 csum_size = sizeof(struct ext4_dir_entry_tail);
1145
1146         inode->i_size = inode->i_sb->s_blocksize;
1147         i_size_write(inode, inode->i_sb->s_blocksize);
1148         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1149         ext4_update_final_de(dir_block->b_data,
1150                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1151                         inode->i_sb->s_blocksize - csum_size);
1152
1153         if (csum_size) {
1154                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1155                                      inode->i_sb->s_blocksize);
1156                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1157         }
1158         set_buffer_uptodate(dir_block);
1159         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1160         if (err)
1161                 goto out;
1162         set_buffer_verified(dir_block);
1163 out:
1164         return err;
1165 }
1166
1167 static int ext4_convert_inline_data_nolock(handle_t *handle,
1168                                            struct inode *inode,
1169                                            struct ext4_iloc *iloc)
1170 {
1171         int error;
1172         void *buf = NULL;
1173         struct buffer_head *data_bh = NULL;
1174         struct ext4_map_blocks map;
1175         int inline_size;
1176
1177         inline_size = ext4_get_inline_size(inode);
1178         buf = kmalloc(inline_size, GFP_NOFS);
1179         if (!buf) {
1180                 error = -ENOMEM;
1181                 goto out;
1182         }
1183
1184         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1185         if (error < 0)
1186                 goto out;
1187
1188         /*
1189          * Make sure the inline directory entries pass checks before we try to
1190          * convert them, so that we avoid touching stuff that needs fsck.
1191          */
1192         if (S_ISDIR(inode->i_mode)) {
1193                 error = ext4_check_all_de(inode, iloc->bh,
1194                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1195                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1196                 if (error)
1197                         goto out;
1198         }
1199
1200         error = ext4_destroy_inline_data_nolock(handle, inode);
1201         if (error)
1202                 goto out;
1203
1204         map.m_lblk = 0;
1205         map.m_len = 1;
1206         map.m_flags = 0;
1207         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1208         if (error < 0)
1209                 goto out_restore;
1210         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1211                 error = -EIO;
1212                 goto out_restore;
1213         }
1214
1215         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1216         if (!data_bh) {
1217                 error = -ENOMEM;
1218                 goto out_restore;
1219         }
1220
1221         lock_buffer(data_bh);
1222         error = ext4_journal_get_create_access(handle, data_bh);
1223         if (error) {
1224                 unlock_buffer(data_bh);
1225                 error = -EIO;
1226                 goto out_restore;
1227         }
1228         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1229
1230         if (!S_ISDIR(inode->i_mode)) {
1231                 memcpy(data_bh->b_data, buf, inline_size);
1232                 set_buffer_uptodate(data_bh);
1233                 error = ext4_handle_dirty_metadata(handle,
1234                                                    inode, data_bh);
1235         } else {
1236                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1237                                                        buf, inline_size);
1238         }
1239
1240         unlock_buffer(data_bh);
1241 out_restore:
1242         if (error)
1243                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1244
1245 out:
1246         brelse(data_bh);
1247         kfree(buf);
1248         return error;
1249 }
1250
1251 /*
1252  * Try to add the new entry to the inline data.
1253  * If succeeds, return 0. If not, extended the inline dir and copied data to
1254  * the new created block.
1255  */
1256 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1257                               struct dentry *dentry, struct inode *inode)
1258 {
1259         int ret, inline_size;
1260         void *inline_start;
1261         struct ext4_iloc iloc;
1262         struct inode *dir = d_inode(dentry->d_parent);
1263
1264         ret = ext4_get_inode_loc(dir, &iloc);
1265         if (ret)
1266                 return ret;
1267
1268         down_write(&EXT4_I(dir)->xattr_sem);
1269         if (!ext4_has_inline_data(dir))
1270                 goto out;
1271
1272         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1273                                                  EXT4_INLINE_DOTDOT_SIZE;
1274         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1275
1276         ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
1277                                         inline_start, inline_size);
1278         if (ret != -ENOSPC)
1279                 goto out;
1280
1281         /* check whether it can be inserted to inline xattr space. */
1282         inline_size = EXT4_I(dir)->i_inline_size -
1283                         EXT4_MIN_INLINE_DATA_SIZE;
1284         if (!inline_size) {
1285                 /* Try to use the xattr space.*/
1286                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1287                 if (ret && ret != -ENOSPC)
1288                         goto out;
1289
1290                 inline_size = EXT4_I(dir)->i_inline_size -
1291                                 EXT4_MIN_INLINE_DATA_SIZE;
1292         }
1293
1294         if (inline_size) {
1295                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1296
1297                 ret = ext4_add_dirent_to_inline(handle, fname, dentry,
1298                                                 inode, &iloc, inline_start,
1299                                                 inline_size);
1300
1301                 if (ret != -ENOSPC)
1302                         goto out;
1303         }
1304
1305         /*
1306          * The inline space is filled up, so create a new block for it.
1307          * As the extent tree will be created, we have to save the inline
1308          * dir first.
1309          */
1310         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1311
1312 out:
1313         ext4_mark_inode_dirty(handle, dir);
1314         up_write(&EXT4_I(dir)->xattr_sem);
1315         brelse(iloc.bh);
1316         return ret;
1317 }
1318
1319 /*
1320  * This function fills a red-black tree with information from an
1321  * inlined dir.  It returns the number directory entries loaded
1322  * into the tree.  If there is an error it is returned in err.
1323  */
1324 int htree_inlinedir_to_tree(struct file *dir_file,
1325                             struct inode *dir, ext4_lblk_t block,
1326                             struct dx_hash_info *hinfo,
1327                             __u32 start_hash, __u32 start_minor_hash,
1328                             int *has_inline_data)
1329 {
1330         int err = 0, count = 0;
1331         unsigned int parent_ino;
1332         int pos;
1333         struct ext4_dir_entry_2 *de;
1334         struct inode *inode = file_inode(dir_file);
1335         int ret, inline_size = 0;
1336         struct ext4_iloc iloc;
1337         void *dir_buf = NULL;
1338         struct ext4_dir_entry_2 fake;
1339         struct ext4_str tmp_str;
1340
1341         ret = ext4_get_inode_loc(inode, &iloc);
1342         if (ret)
1343                 return ret;
1344
1345         down_read(&EXT4_I(inode)->xattr_sem);
1346         if (!ext4_has_inline_data(inode)) {
1347                 up_read(&EXT4_I(inode)->xattr_sem);
1348                 *has_inline_data = 0;
1349                 goto out;
1350         }
1351
1352         inline_size = ext4_get_inline_size(inode);
1353         dir_buf = kmalloc(inline_size, GFP_NOFS);
1354         if (!dir_buf) {
1355                 ret = -ENOMEM;
1356                 up_read(&EXT4_I(inode)->xattr_sem);
1357                 goto out;
1358         }
1359
1360         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1361         up_read(&EXT4_I(inode)->xattr_sem);
1362         if (ret < 0)
1363                 goto out;
1364
1365         pos = 0;
1366         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1367         while (pos < inline_size) {
1368                 /*
1369                  * As inlined dir doesn't store any information about '.' and
1370                  * only the inode number of '..' is stored, we have to handle
1371                  * them differently.
1372                  */
1373                 if (pos == 0) {
1374                         fake.inode = cpu_to_le32(inode->i_ino);
1375                         fake.name_len = 1;
1376                         strcpy(fake.name, ".");
1377                         fake.rec_len = ext4_rec_len_to_disk(
1378                                                 EXT4_DIR_REC_LEN(fake.name_len),
1379                                                 inline_size);
1380                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1381                         de = &fake;
1382                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1383                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1384                         fake.inode = cpu_to_le32(parent_ino);
1385                         fake.name_len = 2;
1386                         strcpy(fake.name, "..");
1387                         fake.rec_len = ext4_rec_len_to_disk(
1388                                                 EXT4_DIR_REC_LEN(fake.name_len),
1389                                                 inline_size);
1390                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1391                         de = &fake;
1392                         pos = EXT4_INLINE_DOTDOT_SIZE;
1393                 } else {
1394                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1395                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1396                         if (ext4_check_dir_entry(inode, dir_file, de,
1397                                          iloc.bh, dir_buf,
1398                                          inline_size, pos)) {
1399                                 ret = count;
1400                                 goto out;
1401                         }
1402                 }
1403
1404                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1405                 if ((hinfo->hash < start_hash) ||
1406                     ((hinfo->hash == start_hash) &&
1407                      (hinfo->minor_hash < start_minor_hash)))
1408                         continue;
1409                 if (de->inode == 0)
1410                         continue;
1411                 tmp_str.name = de->name;
1412                 tmp_str.len = de->name_len;
1413                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1414                                               hinfo->minor_hash, de, &tmp_str);
1415                 if (err) {
1416                         count = err;
1417                         goto out;
1418                 }
1419                 count++;
1420         }
1421         ret = count;
1422 out:
1423         kfree(dir_buf);
1424         brelse(iloc.bh);
1425         return ret;
1426 }
1427
1428 /*
1429  * So this function is called when the volume is mkfsed with
1430  * dir_index disabled. In order to keep f_pos persistent
1431  * after we convert from an inlined dir to a blocked based,
1432  * we just pretend that we are a normal dir and return the
1433  * offset as if '.' and '..' really take place.
1434  *
1435  */
1436 int ext4_read_inline_dir(struct file *file,
1437                          struct dir_context *ctx,
1438                          int *has_inline_data)
1439 {
1440         unsigned int offset, parent_ino;
1441         int i;
1442         struct ext4_dir_entry_2 *de;
1443         struct super_block *sb;
1444         struct inode *inode = file_inode(file);
1445         int ret, inline_size = 0;
1446         struct ext4_iloc iloc;
1447         void *dir_buf = NULL;
1448         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1449
1450         ret = ext4_get_inode_loc(inode, &iloc);
1451         if (ret)
1452                 return ret;
1453
1454         down_read(&EXT4_I(inode)->xattr_sem);
1455         if (!ext4_has_inline_data(inode)) {
1456                 up_read(&EXT4_I(inode)->xattr_sem);
1457                 *has_inline_data = 0;
1458                 goto out;
1459         }
1460
1461         inline_size = ext4_get_inline_size(inode);
1462         dir_buf = kmalloc(inline_size, GFP_NOFS);
1463         if (!dir_buf) {
1464                 ret = -ENOMEM;
1465                 up_read(&EXT4_I(inode)->xattr_sem);
1466                 goto out;
1467         }
1468
1469         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1470         up_read(&EXT4_I(inode)->xattr_sem);
1471         if (ret < 0)
1472                 goto out;
1473
1474         ret = 0;
1475         sb = inode->i_sb;
1476         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1477         offset = ctx->pos;
1478
1479         /*
1480          * dotdot_offset and dotdot_size is the real offset and
1481          * size for ".." and "." if the dir is block based while
1482          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1483          * So we will use extra_offset and extra_size to indicate them
1484          * during the inline dir iteration.
1485          */
1486         dotdot_offset = EXT4_DIR_REC_LEN(1);
1487         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1488         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1489         extra_size = extra_offset + inline_size;
1490
1491         /*
1492          * If the version has changed since the last call to
1493          * readdir(2), then we might be pointing to an invalid
1494          * dirent right now.  Scan from the start of the inline
1495          * dir to make sure.
1496          */
1497         if (file->f_version != inode->i_version) {
1498                 for (i = 0; i < extra_size && i < offset;) {
1499                         /*
1500                          * "." is with offset 0 and
1501                          * ".." is dotdot_offset.
1502                          */
1503                         if (!i) {
1504                                 i = dotdot_offset;
1505                                 continue;
1506                         } else if (i == dotdot_offset) {
1507                                 i = dotdot_size;
1508                                 continue;
1509                         }
1510                         /* for other entry, the real offset in
1511                          * the buf has to be tuned accordingly.
1512                          */
1513                         de = (struct ext4_dir_entry_2 *)
1514                                 (dir_buf + i - extra_offset);
1515                         /* It's too expensive to do a full
1516                          * dirent test each time round this
1517                          * loop, but we do have to test at
1518                          * least that it is non-zero.  A
1519                          * failure will be detected in the
1520                          * dirent test below. */
1521                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1522                                 < EXT4_DIR_REC_LEN(1))
1523                                 break;
1524                         i += ext4_rec_len_from_disk(de->rec_len,
1525                                                     extra_size);
1526                 }
1527                 offset = i;
1528                 ctx->pos = offset;
1529                 file->f_version = inode->i_version;
1530         }
1531
1532         while (ctx->pos < extra_size) {
1533                 if (ctx->pos == 0) {
1534                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1535                                 goto out;
1536                         ctx->pos = dotdot_offset;
1537                         continue;
1538                 }
1539
1540                 if (ctx->pos == dotdot_offset) {
1541                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1542                                 goto out;
1543                         ctx->pos = dotdot_size;
1544                         continue;
1545                 }
1546
1547                 de = (struct ext4_dir_entry_2 *)
1548                         (dir_buf + ctx->pos - extra_offset);
1549                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1550                                          extra_size, ctx->pos))
1551                         goto out;
1552                 if (le32_to_cpu(de->inode)) {
1553                         if (!dir_emit(ctx, de->name, de->name_len,
1554                                       le32_to_cpu(de->inode),
1555                                       get_dtype(sb, de->file_type)))
1556                                 goto out;
1557                 }
1558                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1559         }
1560 out:
1561         kfree(dir_buf);
1562         brelse(iloc.bh);
1563         return ret;
1564 }
1565
1566 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1567                                         struct ext4_dir_entry_2 **parent_de,
1568                                         int *retval)
1569 {
1570         struct ext4_iloc iloc;
1571
1572         *retval = ext4_get_inode_loc(inode, &iloc);
1573         if (*retval)
1574                 return NULL;
1575
1576         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1577
1578         return iloc.bh;
1579 }
1580
1581 /*
1582  * Try to create the inline data for the new dir.
1583  * If it succeeds, return 0, otherwise return the error.
1584  * In case of ENOSPC, the caller should create the normal disk layout dir.
1585  */
1586 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1587                                struct inode *inode)
1588 {
1589         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1590         struct ext4_iloc iloc;
1591         struct ext4_dir_entry_2 *de;
1592
1593         ret = ext4_get_inode_loc(inode, &iloc);
1594         if (ret)
1595                 return ret;
1596
1597         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1598         if (ret)
1599                 goto out;
1600
1601         /*
1602          * For inline dir, we only save the inode information for the ".."
1603          * and create a fake dentry to cover the left space.
1604          */
1605         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1606         de->inode = cpu_to_le32(parent->i_ino);
1607         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1608         de->inode = 0;
1609         de->rec_len = ext4_rec_len_to_disk(
1610                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1611                                 inline_size);
1612         set_nlink(inode, 2);
1613         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1614 out:
1615         brelse(iloc.bh);
1616         return ret;
1617 }
1618
1619 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1620                                         struct ext4_filename *fname,
1621                                         const struct qstr *d_name,
1622                                         struct ext4_dir_entry_2 **res_dir,
1623                                         int *has_inline_data)
1624 {
1625         int ret;
1626         struct ext4_iloc iloc;
1627         void *inline_start;
1628         int inline_size;
1629
1630         if (ext4_get_inode_loc(dir, &iloc))
1631                 return NULL;
1632
1633         down_read(&EXT4_I(dir)->xattr_sem);
1634         if (!ext4_has_inline_data(dir)) {
1635                 *has_inline_data = 0;
1636                 goto out;
1637         }
1638
1639         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1640                                                 EXT4_INLINE_DOTDOT_SIZE;
1641         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1642         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1643                               dir, fname, d_name, 0, res_dir);
1644         if (ret == 1)
1645                 goto out_find;
1646         if (ret < 0)
1647                 goto out;
1648
1649         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1650                 goto out;
1651
1652         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1653         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1654
1655         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1656                               dir, fname, d_name, 0, res_dir);
1657         if (ret == 1)
1658                 goto out_find;
1659
1660 out:
1661         brelse(iloc.bh);
1662         iloc.bh = NULL;
1663 out_find:
1664         up_read(&EXT4_I(dir)->xattr_sem);
1665         return iloc.bh;
1666 }
1667
1668 int ext4_delete_inline_entry(handle_t *handle,
1669                              struct inode *dir,
1670                              struct ext4_dir_entry_2 *de_del,
1671                              struct buffer_head *bh,
1672                              int *has_inline_data)
1673 {
1674         int err, inline_size;
1675         struct ext4_iloc iloc;
1676         void *inline_start;
1677
1678         err = ext4_get_inode_loc(dir, &iloc);
1679         if (err)
1680                 return err;
1681
1682         down_write(&EXT4_I(dir)->xattr_sem);
1683         if (!ext4_has_inline_data(dir)) {
1684                 *has_inline_data = 0;
1685                 goto out;
1686         }
1687
1688         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1689                 EXT4_MIN_INLINE_DATA_SIZE) {
1690                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1691                                         EXT4_INLINE_DOTDOT_SIZE;
1692                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1693                                 EXT4_INLINE_DOTDOT_SIZE;
1694         } else {
1695                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1696                 inline_size = ext4_get_inline_size(dir) -
1697                                 EXT4_MIN_INLINE_DATA_SIZE;
1698         }
1699
1700         BUFFER_TRACE(bh, "get_write_access");
1701         err = ext4_journal_get_write_access(handle, bh);
1702         if (err)
1703                 goto out;
1704
1705         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1706                                         inline_start, inline_size, 0);
1707         if (err)
1708                 goto out;
1709
1710         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1711         err = ext4_mark_inode_dirty(handle, dir);
1712         if (unlikely(err))
1713                 goto out;
1714
1715         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1716 out:
1717         up_write(&EXT4_I(dir)->xattr_sem);
1718         brelse(iloc.bh);
1719         if (err != -ENOENT)
1720                 ext4_std_error(dir->i_sb, err);
1721         return err;
1722 }
1723
1724 /*
1725  * Get the inline dentry at offset.
1726  */
1727 static inline struct ext4_dir_entry_2 *
1728 ext4_get_inline_entry(struct inode *inode,
1729                       struct ext4_iloc *iloc,
1730                       unsigned int offset,
1731                       void **inline_start,
1732                       int *inline_size)
1733 {
1734         void *inline_pos;
1735
1736         BUG_ON(offset > ext4_get_inline_size(inode));
1737
1738         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1739                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1740                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1741         } else {
1742                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1743                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1744                 *inline_size = ext4_get_inline_size(inode) -
1745                                 EXT4_MIN_INLINE_DATA_SIZE;
1746         }
1747
1748         if (inline_start)
1749                 *inline_start = inline_pos;
1750         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1751 }
1752
1753 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1754 {
1755         int err, inline_size;
1756         struct ext4_iloc iloc;
1757         void *inline_pos;
1758         unsigned int offset;
1759         struct ext4_dir_entry_2 *de;
1760         int ret = 1;
1761
1762         err = ext4_get_inode_loc(dir, &iloc);
1763         if (err) {
1764                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1765                                  err, dir->i_ino);
1766                 return 1;
1767         }
1768
1769         down_read(&EXT4_I(dir)->xattr_sem);
1770         if (!ext4_has_inline_data(dir)) {
1771                 *has_inline_data = 0;
1772                 goto out;
1773         }
1774
1775         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1776         if (!le32_to_cpu(de->inode)) {
1777                 ext4_warning(dir->i_sb,
1778                              "bad inline directory (dir #%lu) - no `..'",
1779                              dir->i_ino);
1780                 ret = 1;
1781                 goto out;
1782         }
1783
1784         offset = EXT4_INLINE_DOTDOT_SIZE;
1785         while (offset < dir->i_size) {
1786                 de = ext4_get_inline_entry(dir, &iloc, offset,
1787                                            &inline_pos, &inline_size);
1788                 if (ext4_check_dir_entry(dir, NULL, de,
1789                                          iloc.bh, inline_pos,
1790                                          inline_size, offset)) {
1791                         ext4_warning(dir->i_sb,
1792                                      "bad inline directory (dir #%lu) - "
1793                                      "inode %u, rec_len %u, name_len %d"
1794                                      "inline size %d\n",
1795                                      dir->i_ino, le32_to_cpu(de->inode),
1796                                      le16_to_cpu(de->rec_len), de->name_len,
1797                                      inline_size);
1798                         ret = 1;
1799                         goto out;
1800                 }
1801                 if (le32_to_cpu(de->inode)) {
1802                         ret = 0;
1803                         goto out;
1804                 }
1805                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1806         }
1807
1808 out:
1809         up_read(&EXT4_I(dir)->xattr_sem);
1810         brelse(iloc.bh);
1811         return ret;
1812 }
1813
1814 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1815 {
1816         int ret;
1817
1818         down_write(&EXT4_I(inode)->xattr_sem);
1819         ret = ext4_destroy_inline_data_nolock(handle, inode);
1820         up_write(&EXT4_I(inode)->xattr_sem);
1821
1822         return ret;
1823 }
1824
1825 int ext4_inline_data_fiemap(struct inode *inode,
1826                             struct fiemap_extent_info *fieinfo,
1827                             int *has_inline, __u64 start, __u64 len)
1828 {
1829         __u64 physical = 0;
1830         __u64 inline_len;
1831         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1832                 FIEMAP_EXTENT_LAST;
1833         int error = 0;
1834         struct ext4_iloc iloc;
1835
1836         down_read(&EXT4_I(inode)->xattr_sem);
1837         if (!ext4_has_inline_data(inode)) {
1838                 *has_inline = 0;
1839                 goto out;
1840         }
1841         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1842                            i_size_read(inode));
1843         if (start >= inline_len)
1844                 goto out;
1845         if (start + len < inline_len)
1846                 inline_len = start + len;
1847         inline_len -= start;
1848
1849         error = ext4_get_inode_loc(inode, &iloc);
1850         if (error)
1851                 goto out;
1852
1853         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1854         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1855         physical += offsetof(struct ext4_inode, i_block);
1856
1857         if (physical)
1858                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1859                                                 inline_len, flags);
1860         brelse(iloc.bh);
1861 out:
1862         up_read(&EXT4_I(inode)->xattr_sem);
1863         return (error < 0 ? error : 0);
1864 }
1865
1866 /*
1867  * Called during xattr set, and if we can sparse space 'needed',
1868  * just create the extent tree evict the data to the outer block.
1869  *
1870  * We use jbd2 instead of page cache to move data to the 1st block
1871  * so that the whole transaction can be committed as a whole and
1872  * the data isn't lost because of the delayed page cache write.
1873  */
1874 int ext4_try_to_evict_inline_data(handle_t *handle,
1875                                   struct inode *inode,
1876                                   int needed)
1877 {
1878         int error;
1879         struct ext4_xattr_entry *entry;
1880         struct ext4_inode *raw_inode;
1881         struct ext4_iloc iloc;
1882
1883         error = ext4_get_inode_loc(inode, &iloc);
1884         if (error)
1885                 return error;
1886
1887         raw_inode = ext4_raw_inode(&iloc);
1888         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1889                                             EXT4_I(inode)->i_inline_off);
1890         if (EXT4_XATTR_LEN(entry->e_name_len) +
1891             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1892                 error = -ENOSPC;
1893                 goto out;
1894         }
1895
1896         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1897 out:
1898         brelse(iloc.bh);
1899         return error;
1900 }
1901
1902 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1903 {
1904         handle_t *handle;
1905         int inline_size, value_len, needed_blocks;
1906         size_t i_size;
1907         void *value = NULL;
1908         struct ext4_xattr_ibody_find is = {
1909                 .s = { .not_found = -ENODATA, },
1910         };
1911         struct ext4_xattr_info i = {
1912                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1913                 .name = EXT4_XATTR_SYSTEM_DATA,
1914         };
1915
1916
1917         needed_blocks = ext4_writepage_trans_blocks(inode);
1918         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1919         if (IS_ERR(handle))
1920                 return;
1921
1922         down_write(&EXT4_I(inode)->xattr_sem);
1923         if (!ext4_has_inline_data(inode)) {
1924                 *has_inline = 0;
1925                 ext4_journal_stop(handle);
1926                 return;
1927         }
1928
1929         if (ext4_orphan_add(handle, inode))
1930                 goto out;
1931
1932         if (ext4_get_inode_loc(inode, &is.iloc))
1933                 goto out;
1934
1935         down_write(&EXT4_I(inode)->i_data_sem);
1936         i_size = inode->i_size;
1937         inline_size = ext4_get_inline_size(inode);
1938         EXT4_I(inode)->i_disksize = i_size;
1939
1940         if (i_size < inline_size) {
1941                 /* Clear the content in the xattr space. */
1942                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1943                         if (ext4_xattr_ibody_find(inode, &i, &is))
1944                                 goto out_error;
1945
1946                         BUG_ON(is.s.not_found);
1947
1948                         value_len = le32_to_cpu(is.s.here->e_value_size);
1949                         value = kmalloc(value_len, GFP_NOFS);
1950                         if (!value)
1951                                 goto out_error;
1952
1953                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1954                                                 value, value_len))
1955                                 goto out_error;
1956
1957                         i.value = value;
1958                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1959                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1960                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1961                                 goto out_error;
1962                 }
1963
1964                 /* Clear the content within i_blocks. */
1965                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1966                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1967                         memset(p + i_size, 0,
1968                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1969                 }
1970
1971                 EXT4_I(inode)->i_inline_size = i_size <
1972                                         EXT4_MIN_INLINE_DATA_SIZE ?
1973                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1974         }
1975
1976 out_error:
1977         up_write(&EXT4_I(inode)->i_data_sem);
1978 out:
1979         brelse(is.iloc.bh);
1980         up_write(&EXT4_I(inode)->xattr_sem);
1981         kfree(value);
1982         if (inode->i_nlink)
1983                 ext4_orphan_del(handle, inode);
1984
1985         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1986         ext4_mark_inode_dirty(handle, inode);
1987         if (IS_SYNC(inode))
1988                 ext4_handle_sync(handle);
1989
1990         ext4_journal_stop(handle);
1991         return;
1992 }
1993
1994 int ext4_convert_inline_data(struct inode *inode)
1995 {
1996         int error, needed_blocks;
1997         handle_t *handle;
1998         struct ext4_iloc iloc;
1999
2000         if (!ext4_has_inline_data(inode)) {
2001                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2002                 return 0;
2003         }
2004
2005         needed_blocks = ext4_writepage_trans_blocks(inode);
2006
2007         iloc.bh = NULL;
2008         error = ext4_get_inode_loc(inode, &iloc);
2009         if (error)
2010                 return error;
2011
2012         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2013         if (IS_ERR(handle)) {
2014                 error = PTR_ERR(handle);
2015                 goto out_free;
2016         }
2017
2018         down_write(&EXT4_I(inode)->xattr_sem);
2019         if (!ext4_has_inline_data(inode)) {
2020                 up_write(&EXT4_I(inode)->xattr_sem);
2021                 goto out;
2022         }
2023
2024         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2025         up_write(&EXT4_I(inode)->xattr_sem);
2026 out:
2027         ext4_journal_stop(handle);
2028 out_free:
2029         brelse(iloc.bh);
2030         return error;
2031 }