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                 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
 937         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 938
 939         /*
 940          * No need to use i_size_read() here, the i_size
 941          * cannot change under us because we hold i_mutex.
 942          *
 943          * But it's important to update i_size while still holding page lock:
 944          * page writeout could otherwise come in and zero beyond i_size.
 945          */
 946         if (pos+copied > inode->i_size) {
 947                 i_size_write(inode, pos+copied);
 948                 i_size_changed = 1;
 949         }
 950         unlock_page(page);
 951         page_cache_release(page);
 952
 953         /*
 954          * Don't mark the inode dirty under page lock. First, it unnecessarily
 955          * makes the holding time of page lock longer. Second, it forces lock
 956          * ordering of page lock and transaction start for journaling
 957          * filesystems.
 958          */
 959         if (i_size_changed)
 960                 mark_inode_dirty(inode);
 961
 962         return copied;
 963 }
 964
 965 #ifdef INLINE_DIR_DEBUG
 966 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 967                           void *inline_start, int inline_size)
 968 {
 969         int offset;
 970         unsigned short de_len;
 971         struct ext4_dir_entry_2 *de = inline_start;
 972         void *dlimit = inline_start + inline_size;
 973
 974         trace_printk("inode %lu\n", dir->i_ino);
 975         offset = 0;
 976         while ((void *)de < dlimit) {
 977                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 978                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 979                              offset, de_len, de->name_len, de->name,
 980                              de->name_len, le32_to_cpu(de->inode));
 981                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 982                                          inline_start, inline_size, offset))
 983                         BUG();
 984
 985                 offset += de_len;
 986                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 987         }
 988 }
 989 #else
 990 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 991 #endif
 992
 993 /*
 994  * Add a new entry into a inline dir.
 995  * It will return -ENOSPC if no space is available, and -EIO
 996  * and -EEXIST if directory entry already exists.
 997  */
 998 static int ext4_add_dirent_to_inline(handle_t *handle,
 999                                      struct ext4_filename *fname,
1000                                      struct dentry *dentry,
1001                                      struct inode *inode,
1002                                      struct ext4_iloc *iloc,
1003                                      void *inline_start, int inline_size)
1004 {
1005         struct inode    *dir = d_inode(dentry->d_parent);
1006         int             err;
1007         struct ext4_dir_entry_2 *de;
1008
1009         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1010                                 inline_size, fname, &de);
1011         if (err)
1012                 return err;
1013
1014         BUFFER_TRACE(iloc->bh, "get_write_access");
1015         err = ext4_journal_get_write_access(handle, iloc->bh);
1016         if (err)
1017                 return err;
1018         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1019
1020         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1021
1022         /*
1023          * XXX shouldn't update any times until successful
1024          * completion of syscall, but too many callers depend
1025          * on this.
1026          *
1027          * XXX similarly, too many callers depend on
1028          * ext4_new_inode() setting the times, but error
1029          * recovery deletes the inode, so the worst that can
1030          * happen is that the times are slightly out of date
1031          * and/or different from the directory change time.
1032          */
1033         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1034         ext4_update_dx_flag(dir);
1035         dir->i_version++;
1036         ext4_mark_inode_dirty(handle, dir);
1037         return 1;
1038 }
1039
1040 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1041                                        struct ext4_iloc *iloc)
1042 {
1043         struct ext4_xattr_entry *entry;
1044         struct ext4_xattr_ibody_header *header;
1045
1046         BUG_ON(!EXT4_I(inode)->i_inline_off);
1047
1048         header = IHDR(inode, ext4_raw_inode(iloc));
1049         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1050                                             EXT4_I(inode)->i_inline_off);
1051
1052         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1053 }
1054
1055 /* Set the final de to cover the whole block. */
1056 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1057 {
1058         struct ext4_dir_entry_2 *de, *prev_de;
1059         void *limit;
1060         int de_len;
1061
1062         de = (struct ext4_dir_entry_2 *)de_buf;
1063         if (old_size) {
1064                 limit = de_buf + old_size;
1065                 do {
1066                         prev_de = de;
1067                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1068                         de_buf += de_len;
1069                         de = (struct ext4_dir_entry_2 *)de_buf;
1070                 } while (de_buf < limit);
1071
1072                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1073                                                         old_size, new_size);
1074         } else {
1075                 /* this is just created, so create an empty entry. */
1076                 de->inode = 0;
1077                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1078         }
1079 }
1080
1081 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1082                                   struct ext4_iloc *iloc)
1083 {
1084         int ret;
1085         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1086         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1087
1088         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1089                 return -ENOSPC;
1090
1091         ret = ext4_update_inline_data(handle, dir,
1092                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1093         if (ret)
1094                 return ret;
1095
1096         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1097                              EXT4_I(dir)->i_inline_size -
1098                                                 EXT4_MIN_INLINE_DATA_SIZE);
1099         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1100         return 0;
1101 }
1102
1103 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1104                                      struct ext4_iloc *iloc,
1105                                      void *buf, int inline_size)
1106 {
1107         ext4_create_inline_data(handle, inode, inline_size);
1108         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1109         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1110 }
1111
1112 static int ext4_finish_convert_inline_dir(handle_t *handle,
1113                                           struct inode *inode,
1114                                           struct buffer_head *dir_block,
1115                                           void *buf,
1116                                           int inline_size)
1117 {
1118         int err, csum_size = 0, header_size = 0;
1119         struct ext4_dir_entry_2 *de;
1120         struct ext4_dir_entry_tail *t;
1121         void *target = dir_block->b_data;
1122
1123         /*
1124          * First create "." and ".." and then copy the dir information
1125          * back to the block.
1126          */
1127         de = (struct ext4_dir_entry_2 *)target;
1128         de = ext4_init_dot_dotdot(inode, de,
1129                 inode->i_sb->s_blocksize, csum_size,
1130                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1131         header_size = (void *)de - target;
1132
1133         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1134                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1135
1136         if (ext4_has_metadata_csum(inode->i_sb))
1137                 csum_size = sizeof(struct ext4_dir_entry_tail);
1138
1139         inode->i_size = inode->i_sb->s_blocksize;
1140         i_size_write(inode, inode->i_sb->s_blocksize);
1141         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1142         ext4_update_final_de(dir_block->b_data,
1143                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1144                         inode->i_sb->s_blocksize - csum_size);
1145
1146         if (csum_size) {
1147                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1148                                      inode->i_sb->s_blocksize);
1149                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1150         }
1151         set_buffer_uptodate(dir_block);
1152         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1153         if (err)
1154                 goto out;
1155         set_buffer_verified(dir_block);
1156 out:
1157         return err;
1158 }
1159
1160 static int ext4_convert_inline_data_nolock(handle_t *handle,
1161                                            struct inode *inode,
1162                                            struct ext4_iloc *iloc)
1163 {
1164         int error;
1165         void *buf = NULL;
1166         struct buffer_head *data_bh = NULL;
1167         struct ext4_map_blocks map;
1168         int inline_size;
1169
1170         inline_size = ext4_get_inline_size(inode);
1171         buf = kmalloc(inline_size, GFP_NOFS);
1172         if (!buf) {
1173                 error = -ENOMEM;
1174                 goto out;
1175         }
1176
1177         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1178         if (error < 0)
1179                 goto out;
1180
1181         /*
1182          * Make sure the inline directory entries pass checks before we try to
1183          * convert them, so that we avoid touching stuff that needs fsck.
1184          */
1185         if (S_ISDIR(inode->i_mode)) {
1186                 error = ext4_check_all_de(inode, iloc->bh,
1187                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1188                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1189                 if (error)
1190                         goto out;
1191         }
1192
1193         error = ext4_destroy_inline_data_nolock(handle, inode);
1194         if (error)
1195                 goto out;
1196
1197         map.m_lblk = 0;
1198         map.m_len = 1;
1199         map.m_flags = 0;
1200         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1201         if (error < 0)
1202                 goto out_restore;
1203         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1204                 error = -EIO;
1205                 goto out_restore;
1206         }
1207
1208         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1209         if (!data_bh) {
1210                 error = -ENOMEM;
1211                 goto out_restore;
1212         }
1213
1214         lock_buffer(data_bh);
1215         error = ext4_journal_get_create_access(handle, data_bh);
1216         if (error) {
1217                 unlock_buffer(data_bh);
1218                 error = -EIO;
1219                 goto out_restore;
1220         }
1221         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1222
1223         if (!S_ISDIR(inode->i_mode)) {
1224                 memcpy(data_bh->b_data, buf, inline_size);
1225                 set_buffer_uptodate(data_bh);
1226                 error = ext4_handle_dirty_metadata(handle,
1227                                                    inode, data_bh);
1228         } else {
1229                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1230                                                        buf, inline_size);
1231         }
1232
1233         unlock_buffer(data_bh);
1234 out_restore:
1235         if (error)
1236                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1237
1238 out:
1239         brelse(data_bh);
1240         kfree(buf);
1241         return error;
1242 }
1243
1244 /*
1245  * Try to add the new entry to the inline data.
1246  * If succeeds, return 0. If not, extended the inline dir and copied data to
1247  * the new created block.
1248  */
1249 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1250                               struct dentry *dentry, struct inode *inode)
1251 {
1252         int ret, inline_size;
1253         void *inline_start;
1254         struct ext4_iloc iloc;
1255         struct inode *dir = d_inode(dentry->d_parent);
1256
1257         ret = ext4_get_inode_loc(dir, &iloc);
1258         if (ret)
1259                 return ret;
1260
1261         down_write(&EXT4_I(dir)->xattr_sem);
1262         if (!ext4_has_inline_data(dir))
1263                 goto out;
1264
1265         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1266                                                  EXT4_INLINE_DOTDOT_SIZE;
1267         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1268
1269         ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
1270                                         inline_start, inline_size);
1271         if (ret != -ENOSPC)
1272                 goto out;
1273
1274         /* check whether it can be inserted to inline xattr space. */
1275         inline_size = EXT4_I(dir)->i_inline_size -
1276                         EXT4_MIN_INLINE_DATA_SIZE;
1277         if (!inline_size) {
1278                 /* Try to use the xattr space.*/
1279                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1280                 if (ret && ret != -ENOSPC)
1281                         goto out;
1282
1283                 inline_size = EXT4_I(dir)->i_inline_size -
1284                                 EXT4_MIN_INLINE_DATA_SIZE;
1285         }
1286
1287         if (inline_size) {
1288                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1289
1290                 ret = ext4_add_dirent_to_inline(handle, fname, dentry,
1291                                                 inode, &iloc, inline_start,
1292                                                 inline_size);
1293
1294                 if (ret != -ENOSPC)
1295                         goto out;
1296         }
1297
1298         /*
1299          * The inline space is filled up, so create a new block for it.
1300          * As the extent tree will be created, we have to save the inline
1301          * dir first.
1302          */
1303         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1304
1305 out:
1306         ext4_mark_inode_dirty(handle, dir);
1307         up_write(&EXT4_I(dir)->xattr_sem);
1308         brelse(iloc.bh);
1309         return ret;
1310 }
1311
1312 /*
1313  * This function fills a red-black tree with information from an
1314  * inlined dir.  It returns the number directory entries loaded
1315  * into the tree.  If there is an error it is returned in err.
1316  */
1317 int htree_inlinedir_to_tree(struct file *dir_file,
1318                             struct inode *dir, ext4_lblk_t block,
1319                             struct dx_hash_info *hinfo,
1320                             __u32 start_hash, __u32 start_minor_hash,
1321                             int *has_inline_data)
1322 {
1323         int err = 0, count = 0;
1324         unsigned int parent_ino;
1325         int pos;
1326         struct ext4_dir_entry_2 *de;
1327         struct inode *inode = file_inode(dir_file);
1328         int ret, inline_size = 0;
1329         struct ext4_iloc iloc;
1330         void *dir_buf = NULL;
1331         struct ext4_dir_entry_2 fake;
1332         struct ext4_str tmp_str;
1333
1334         ret = ext4_get_inode_loc(inode, &iloc);
1335         if (ret)
1336                 return ret;
1337
1338         down_read(&EXT4_I(inode)->xattr_sem);
1339         if (!ext4_has_inline_data(inode)) {
1340                 up_read(&EXT4_I(inode)->xattr_sem);
1341                 *has_inline_data = 0;
1342                 goto out;
1343         }
1344
1345         inline_size = ext4_get_inline_size(inode);
1346         dir_buf = kmalloc(inline_size, GFP_NOFS);
1347         if (!dir_buf) {
1348                 ret = -ENOMEM;
1349                 up_read(&EXT4_I(inode)->xattr_sem);
1350                 goto out;
1351         }
1352
1353         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1354         up_read(&EXT4_I(inode)->xattr_sem);
1355         if (ret < 0)
1356                 goto out;
1357
1358         pos = 0;
1359         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1360         while (pos < inline_size) {
1361                 /*
1362                  * As inlined dir doesn't store any information about '.' and
1363                  * only the inode number of '..' is stored, we have to handle
1364                  * them differently.
1365                  */
1366                 if (pos == 0) {
1367                         fake.inode = cpu_to_le32(inode->i_ino);
1368                         fake.name_len = 1;
1369                         strcpy(fake.name, ".");
1370                         fake.rec_len = ext4_rec_len_to_disk(
1371                                                 EXT4_DIR_REC_LEN(fake.name_len),
1372                                                 inline_size);
1373                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1374                         de = &fake;
1375                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1376                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1377                         fake.inode = cpu_to_le32(parent_ino);
1378                         fake.name_len = 2;
1379                         strcpy(fake.name, "..");
1380                         fake.rec_len = ext4_rec_len_to_disk(
1381                                                 EXT4_DIR_REC_LEN(fake.name_len),
1382                                                 inline_size);
1383                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1384                         de = &fake;
1385                         pos = EXT4_INLINE_DOTDOT_SIZE;
1386                 } else {
1387                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1388                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1389                         if (ext4_check_dir_entry(inode, dir_file, de,
1390                                          iloc.bh, dir_buf,
1391                                          inline_size, pos)) {
1392                                 ret = count;
1393                                 goto out;
1394                         }
1395                 }
1396
1397                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1398                 if ((hinfo->hash < start_hash) ||
1399                     ((hinfo->hash == start_hash) &&
1400                      (hinfo->minor_hash < start_minor_hash)))
1401                         continue;
1402                 if (de->inode == 0)
1403                         continue;
1404                 tmp_str.name = de->name;
1405                 tmp_str.len = de->name_len;
1406                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1407                                               hinfo->minor_hash, de, &tmp_str);
1408                 if (err) {
1409                         count = err;
1410                         goto out;
1411                 }
1412                 count++;
1413         }
1414         ret = count;
1415 out:
1416         kfree(dir_buf);
1417         brelse(iloc.bh);
1418         return ret;
1419 }
1420
1421 /*
1422  * So this function is called when the volume is mkfsed with
1423  * dir_index disabled. In order to keep f_pos persistent
1424  * after we convert from an inlined dir to a blocked based,
1425  * we just pretend that we are a normal dir and return the
1426  * offset as if '.' and '..' really take place.
1427  *
1428  */
1429 int ext4_read_inline_dir(struct file *file,
1430                          struct dir_context *ctx,
1431                          int *has_inline_data)
1432 {
1433         unsigned int offset, parent_ino;
1434         int i;
1435         struct ext4_dir_entry_2 *de;
1436         struct super_block *sb;
1437         struct inode *inode = file_inode(file);
1438         int ret, inline_size = 0;
1439         struct ext4_iloc iloc;
1440         void *dir_buf = NULL;
1441         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1442
1443         ret = ext4_get_inode_loc(inode, &iloc);
1444         if (ret)
1445                 return ret;
1446
1447         down_read(&EXT4_I(inode)->xattr_sem);
1448         if (!ext4_has_inline_data(inode)) {
1449                 up_read(&EXT4_I(inode)->xattr_sem);
1450                 *has_inline_data = 0;
1451                 goto out;
1452         }
1453
1454         inline_size = ext4_get_inline_size(inode);
1455         dir_buf = kmalloc(inline_size, GFP_NOFS);
1456         if (!dir_buf) {
1457                 ret = -ENOMEM;
1458                 up_read(&EXT4_I(inode)->xattr_sem);
1459                 goto out;
1460         }
1461
1462         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1463         up_read(&EXT4_I(inode)->xattr_sem);
1464         if (ret < 0)
1465                 goto out;
1466
1467         ret = 0;
1468         sb = inode->i_sb;
1469         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1470         offset = ctx->pos;
1471
1472         /*
1473          * dotdot_offset and dotdot_size is the real offset and
1474          * size for ".." and "." if the dir is block based while
1475          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1476          * So we will use extra_offset and extra_size to indicate them
1477          * during the inline dir iteration.
1478          */
1479         dotdot_offset = EXT4_DIR_REC_LEN(1);
1480         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1481         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1482         extra_size = extra_offset + inline_size;
1483
1484         /*
1485          * If the version has changed since the last call to
1486          * readdir(2), then we might be pointing to an invalid
1487          * dirent right now.  Scan from the start of the inline
1488          * dir to make sure.
1489          */
1490         if (file->f_version != inode->i_version) {
1491                 for (i = 0; i < extra_size && i < offset;) {
1492                         /*
1493                          * "." is with offset 0 and
1494                          * ".." is dotdot_offset.
1495                          */
1496                         if (!i) {
1497                                 i = dotdot_offset;
1498                                 continue;
1499                         } else if (i == dotdot_offset) {
1500                                 i = dotdot_size;
1501                                 continue;
1502                         }
1503                         /* for other entry, the real offset in
1504                          * the buf has to be tuned accordingly.
1505                          */
1506                         de = (struct ext4_dir_entry_2 *)
1507                                 (dir_buf + i - extra_offset);
1508                         /* It's too expensive to do a full
1509                          * dirent test each time round this
1510                          * loop, but we do have to test at
1511                          * least that it is non-zero.  A
1512                          * failure will be detected in the
1513                          * dirent test below. */
1514                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1515                                 < EXT4_DIR_REC_LEN(1))
1516                                 break;
1517                         i += ext4_rec_len_from_disk(de->rec_len,
1518                                                     extra_size);
1519                 }
1520                 offset = i;
1521                 ctx->pos = offset;
1522                 file->f_version = inode->i_version;
1523         }
1524
1525         while (ctx->pos < extra_size) {
1526                 if (ctx->pos == 0) {
1527                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1528                                 goto out;
1529                         ctx->pos = dotdot_offset;
1530                         continue;
1531                 }
1532
1533                 if (ctx->pos == dotdot_offset) {
1534                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1535                                 goto out;
1536                         ctx->pos = dotdot_size;
1537                         continue;
1538                 }
1539
1540                 de = (struct ext4_dir_entry_2 *)
1541                         (dir_buf + ctx->pos - extra_offset);
1542                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1543                                          extra_size, ctx->pos))
1544                         goto out;
1545                 if (le32_to_cpu(de->inode)) {
1546                         if (!dir_emit(ctx, de->name, de->name_len,
1547                                       le32_to_cpu(de->inode),
1548                                       get_dtype(sb, de->file_type)))
1549                                 goto out;
1550                 }
1551                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1552         }
1553 out:
1554         kfree(dir_buf);
1555         brelse(iloc.bh);
1556         return ret;
1557 }
1558
1559 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1560                                         struct ext4_dir_entry_2 **parent_de,
1561                                         int *retval)
1562 {
1563         struct ext4_iloc iloc;
1564
1565         *retval = ext4_get_inode_loc(inode, &iloc);
1566         if (*retval)
1567                 return NULL;
1568
1569         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1570
1571         return iloc.bh;
1572 }
1573
1574 /*
1575  * Try to create the inline data for the new dir.
1576  * If it succeeds, return 0, otherwise return the error.
1577  * In case of ENOSPC, the caller should create the normal disk layout dir.
1578  */
1579 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1580                                struct inode *inode)
1581 {
1582         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1583         struct ext4_iloc iloc;
1584         struct ext4_dir_entry_2 *de;
1585
1586         ret = ext4_get_inode_loc(inode, &iloc);
1587         if (ret)
1588                 return ret;
1589
1590         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1591         if (ret)
1592                 goto out;
1593
1594         /*
1595          * For inline dir, we only save the inode information for the ".."
1596          * and create a fake dentry to cover the left space.
1597          */
1598         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1599         de->inode = cpu_to_le32(parent->i_ino);
1600         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1601         de->inode = 0;
1602         de->rec_len = ext4_rec_len_to_disk(
1603                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1604                                 inline_size);
1605         set_nlink(inode, 2);
1606         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1607 out:
1608         brelse(iloc.bh);
1609         return ret;
1610 }
1611
1612 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1613                                         struct ext4_filename *fname,
1614                                         const struct qstr *d_name,
1615                                         struct ext4_dir_entry_2 **res_dir,
1616                                         int *has_inline_data)
1617 {
1618         int ret;
1619         struct ext4_iloc iloc;
1620         void *inline_start;
1621         int inline_size;
1622
1623         if (ext4_get_inode_loc(dir, &iloc))
1624                 return NULL;
1625
1626         down_read(&EXT4_I(dir)->xattr_sem);
1627         if (!ext4_has_inline_data(dir)) {
1628                 *has_inline_data = 0;
1629                 goto out;
1630         }
1631
1632         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1633                                                 EXT4_INLINE_DOTDOT_SIZE;
1634         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1635         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1636                               dir, fname, d_name, 0, res_dir);
1637         if (ret == 1)
1638                 goto out_find;
1639         if (ret < 0)
1640                 goto out;
1641
1642         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1643                 goto out;
1644
1645         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1646         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1647
1648         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1649                               dir, fname, d_name, 0, res_dir);
1650         if (ret == 1)
1651                 goto out_find;
1652
1653 out:
1654         brelse(iloc.bh);
1655         iloc.bh = NULL;
1656 out_find:
1657         up_read(&EXT4_I(dir)->xattr_sem);
1658         return iloc.bh;
1659 }
1660
1661 int ext4_delete_inline_entry(handle_t *handle,
1662                              struct inode *dir,
1663                              struct ext4_dir_entry_2 *de_del,
1664                              struct buffer_head *bh,
1665                              int *has_inline_data)
1666 {
1667         int err, inline_size;
1668         struct ext4_iloc iloc;
1669         void *inline_start;
1670
1671         err = ext4_get_inode_loc(dir, &iloc);
1672         if (err)
1673                 return err;
1674
1675         down_write(&EXT4_I(dir)->xattr_sem);
1676         if (!ext4_has_inline_data(dir)) {
1677                 *has_inline_data = 0;
1678                 goto out;
1679         }
1680
1681         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1682                 EXT4_MIN_INLINE_DATA_SIZE) {
1683                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1684                                         EXT4_INLINE_DOTDOT_SIZE;
1685                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1686                                 EXT4_INLINE_DOTDOT_SIZE;
1687         } else {
1688                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1689                 inline_size = ext4_get_inline_size(dir) -
1690                                 EXT4_MIN_INLINE_DATA_SIZE;
1691         }
1692
1693         BUFFER_TRACE(bh, "get_write_access");
1694         err = ext4_journal_get_write_access(handle, bh);
1695         if (err)
1696                 goto out;
1697
1698         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1699                                         inline_start, inline_size, 0);
1700         if (err)
1701                 goto out;
1702
1703         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1704         err = ext4_mark_inode_dirty(handle, dir);
1705         if (unlikely(err))
1706                 goto out;
1707
1708         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1709 out:
1710         up_write(&EXT4_I(dir)->xattr_sem);
1711         brelse(iloc.bh);
1712         if (err != -ENOENT)
1713                 ext4_std_error(dir->i_sb, err);
1714         return err;
1715 }
1716
1717 /*
1718  * Get the inline dentry at offset.
1719  */
1720 static inline struct ext4_dir_entry_2 *
1721 ext4_get_inline_entry(struct inode *inode,
1722                       struct ext4_iloc *iloc,
1723                       unsigned int offset,
1724                       void **inline_start,
1725                       int *inline_size)
1726 {
1727         void *inline_pos;
1728
1729         BUG_ON(offset > ext4_get_inline_size(inode));
1730
1731         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1732                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1733                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1734         } else {
1735                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1736                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1737                 *inline_size = ext4_get_inline_size(inode) -
1738                                 EXT4_MIN_INLINE_DATA_SIZE;
1739         }
1740
1741         if (inline_start)
1742                 *inline_start = inline_pos;
1743         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1744 }
1745
1746 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1747 {
1748         int err, inline_size;
1749         struct ext4_iloc iloc;
1750         void *inline_pos;
1751         unsigned int offset;
1752         struct ext4_dir_entry_2 *de;
1753         int ret = 1;
1754
1755         err = ext4_get_inode_loc(dir, &iloc);
1756         if (err) {
1757                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1758                                  err, dir->i_ino);
1759                 return 1;
1760         }
1761
1762         down_read(&EXT4_I(dir)->xattr_sem);
1763         if (!ext4_has_inline_data(dir)) {
1764                 *has_inline_data = 0;
1765                 goto out;
1766         }
1767
1768         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1769         if (!le32_to_cpu(de->inode)) {
1770                 ext4_warning(dir->i_sb,
1771                              "bad inline directory (dir #%lu) - no `..'",
1772                              dir->i_ino);
1773                 ret = 1;
1774                 goto out;
1775         }
1776
1777         offset = EXT4_INLINE_DOTDOT_SIZE;
1778         while (offset < dir->i_size) {
1779                 de = ext4_get_inline_entry(dir, &iloc, offset,
1780                                            &inline_pos, &inline_size);
1781                 if (ext4_check_dir_entry(dir, NULL, de,
1782                                          iloc.bh, inline_pos,
1783                                          inline_size, offset)) {
1784                         ext4_warning(dir->i_sb,
1785                                      "bad inline directory (dir #%lu) - "
1786                                      "inode %u, rec_len %u, name_len %d"
1787                                      "inline size %d\n",
1788                                      dir->i_ino, le32_to_cpu(de->inode),
1789                                      le16_to_cpu(de->rec_len), de->name_len,
1790                                      inline_size);
1791                         ret = 1;
1792                         goto out;
1793                 }
1794                 if (le32_to_cpu(de->inode)) {
1795                         ret = 0;
1796                         goto out;
1797                 }
1798                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1799         }
1800
1801 out:
1802         up_read(&EXT4_I(dir)->xattr_sem);
1803         brelse(iloc.bh);
1804         return ret;
1805 }
1806
1807 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1808 {
1809         int ret;
1810
1811         down_write(&EXT4_I(inode)->xattr_sem);
1812         ret = ext4_destroy_inline_data_nolock(handle, inode);
1813         up_write(&EXT4_I(inode)->xattr_sem);
1814
1815         return ret;
1816 }
1817
1818 int ext4_inline_data_fiemap(struct inode *inode,
1819                             struct fiemap_extent_info *fieinfo,
1820                             int *has_inline, __u64 start, __u64 len)
1821 {
1822         __u64 physical = 0;
1823         __u64 inline_len;
1824         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1825                 FIEMAP_EXTENT_LAST;
1826         int error = 0;
1827         struct ext4_iloc iloc;
1828
1829         down_read(&EXT4_I(inode)->xattr_sem);
1830         if (!ext4_has_inline_data(inode)) {
1831                 *has_inline = 0;
1832                 goto out;
1833         }
1834         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1835                            i_size_read(inode));
1836         if (start >= inline_len)
1837                 goto out;
1838         if (start + len < inline_len)
1839                 inline_len = start + len;
1840         inline_len -= start;
1841
1842         error = ext4_get_inode_loc(inode, &iloc);
1843         if (error)
1844                 goto out;
1845
1846         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1847         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1848         physical += offsetof(struct ext4_inode, i_block);
1849
1850         if (physical)
1851                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1852                                                 inline_len, flags);
1853         brelse(iloc.bh);
1854 out:
1855         up_read(&EXT4_I(inode)->xattr_sem);
1856         return (error < 0 ? error : 0);
1857 }
1858
1859 /*
1860  * Called during xattr set, and if we can sparse space 'needed',
1861  * just create the extent tree evict the data to the outer block.
1862  *
1863  * We use jbd2 instead of page cache to move data to the 1st block
1864  * so that the whole transaction can be committed as a whole and
1865  * the data isn't lost because of the delayed page cache write.
1866  */
1867 int ext4_try_to_evict_inline_data(handle_t *handle,
1868                                   struct inode *inode,
1869                                   int needed)
1870 {
1871         int error;
1872         struct ext4_xattr_entry *entry;
1873         struct ext4_inode *raw_inode;
1874         struct ext4_iloc iloc;
1875
1876         error = ext4_get_inode_loc(inode, &iloc);
1877         if (error)
1878                 return error;
1879
1880         raw_inode = ext4_raw_inode(&iloc);
1881         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1882                                             EXT4_I(inode)->i_inline_off);
1883         if (EXT4_XATTR_LEN(entry->e_name_len) +
1884             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1885                 error = -ENOSPC;
1886                 goto out;
1887         }
1888
1889         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1890 out:
1891         brelse(iloc.bh);
1892         return error;
1893 }
1894
1895 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1896 {
1897         handle_t *handle;
1898         int inline_size, value_len, needed_blocks;
1899         size_t i_size;
1900         void *value = NULL;
1901         struct ext4_xattr_ibody_find is = {
1902                 .s = { .not_found = -ENODATA, },
1903         };
1904         struct ext4_xattr_info i = {
1905                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1906                 .name = EXT4_XATTR_SYSTEM_DATA,
1907         };
1908
1909
1910         needed_blocks = ext4_writepage_trans_blocks(inode);
1911         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1912         if (IS_ERR(handle))
1913                 return;
1914
1915         down_write(&EXT4_I(inode)->xattr_sem);
1916         if (!ext4_has_inline_data(inode)) {
1917                 *has_inline = 0;
1918                 ext4_journal_stop(handle);
1919                 return;
1920         }
1921
1922         if (ext4_orphan_add(handle, inode))
1923                 goto out;
1924
1925         if (ext4_get_inode_loc(inode, &is.iloc))
1926                 goto out;
1927
1928         down_write(&EXT4_I(inode)->i_data_sem);
1929         i_size = inode->i_size;
1930         inline_size = ext4_get_inline_size(inode);
1931         EXT4_I(inode)->i_disksize = i_size;
1932
1933         if (i_size < inline_size) {
1934                 /* Clear the content in the xattr space. */
1935                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1936                         if (ext4_xattr_ibody_find(inode, &i, &is))
1937                                 goto out_error;
1938
1939                         BUG_ON(is.s.not_found);
1940
1941                         value_len = le32_to_cpu(is.s.here->e_value_size);
1942                         value = kmalloc(value_len, GFP_NOFS);
1943                         if (!value)
1944                                 goto out_error;
1945
1946                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1947                                                 value, value_len))
1948                                 goto out_error;
1949
1950                         i.value = value;
1951                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1952                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1953                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1954                                 goto out_error;
1955                 }
1956
1957                 /* Clear the content within i_blocks. */
1958                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1959                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1960                         memset(p + i_size, 0,
1961                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1962                 }
1963
1964                 EXT4_I(inode)->i_inline_size = i_size <
1965                                         EXT4_MIN_INLINE_DATA_SIZE ?
1966                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1967         }
1968
1969 out_error:
1970         up_write(&EXT4_I(inode)->i_data_sem);
1971 out:
1972         brelse(is.iloc.bh);
1973         up_write(&EXT4_I(inode)->xattr_sem);
1974         kfree(value);
1975         if (inode->i_nlink)
1976                 ext4_orphan_del(handle, inode);
1977
1978         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1979         ext4_mark_inode_dirty(handle, inode);
1980         if (IS_SYNC(inode))
1981                 ext4_handle_sync(handle);
1982
1983         ext4_journal_stop(handle);
1984         return;
1985 }
1986
1987 int ext4_convert_inline_data(struct inode *inode)
1988 {
1989         int error, needed_blocks;
1990         handle_t *handle;
1991         struct ext4_iloc iloc;
1992
1993         if (!ext4_has_inline_data(inode)) {
1994                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1995                 return 0;
1996         }
1997
1998         needed_blocks = ext4_writepage_trans_blocks(inode);
1999
2000         iloc.bh = NULL;
2001         error = ext4_get_inode_loc(inode, &iloc);
2002         if (error)
2003                 return error;
2004
2005         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2006         if (IS_ERR(handle)) {
2007                 error = PTR_ERR(handle);
2008                 goto out_free;
2009         }
2010
2011         down_write(&EXT4_I(inode)->xattr_sem);
2012         if (!ext4_has_inline_data(inode)) {
2013                 up_write(&EXT4_I(inode)->xattr_sem);
2014                 goto out;
2015         }
2016
2017         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2018         up_write(&EXT4_I(inode)->xattr_sem);
2019 out:
2020         ext4_journal_stop(handle);
2021 out_free:
2022         brelse(iloc.bh);
2023         return error;
2024 }