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 #include <trace/events/android_fs.h>
  22
  23 #define EXT4_XATTR_SYSTEM_DATA  "data"
  24 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  25 #define EXT4_INLINE_DOTDOT_OFFSET       2
  26 #define EXT4_INLINE_DOTDOT_SIZE         4
  27
  28 static int ext4_get_inline_size(struct inode *inode)
  29 {
  30         if (EXT4_I(inode)->i_inline_off)
  31                 return EXT4_I(inode)->i_inline_size;
  32
  33         return 0;
  34 }
  35
  36 static int get_max_inline_xattr_value_size(struct inode *inode,
  37                                            struct ext4_iloc *iloc)
  38 {
  39         struct ext4_xattr_ibody_header *header;
  40         struct ext4_xattr_entry *entry;
  41         struct ext4_inode *raw_inode;
  42         int free, min_offs;
  43
  44         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  45                         EXT4_GOOD_OLD_INODE_SIZE -
  46                         EXT4_I(inode)->i_extra_isize -
  47                         sizeof(struct ext4_xattr_ibody_header);
  48
  49         /*
  50          * We need to subtract another sizeof(__u32) since an in-inode xattr
  51          * needs an empty 4 bytes to indicate the gap between the xattr entry
  52          * and the name/value pair.
  53          */
  54         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  55                 return EXT4_XATTR_SIZE(min_offs -
  56                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  57                         EXT4_XATTR_ROUND - sizeof(__u32));
  58
  59         raw_inode = ext4_raw_inode(iloc);
  60         header = IHDR(inode, raw_inode);
  61         entry = IFIRST(header);
  62
  63         /* Compute min_offs. */
  64         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  65                 if (!entry->e_value_block && entry->e_value_size) {
  66                         size_t offs = le16_to_cpu(entry->e_value_offs);
  67                         if (offs < min_offs)
  68                                 min_offs = offs;
  69                 }
  70         }
  71         free = min_offs -
  72                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  73
  74         if (EXT4_I(inode)->i_inline_off) {
  75                 entry = (struct ext4_xattr_entry *)
  76                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  77
  78                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  79                 goto out;
  80         }
  81
  82         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  83
  84         if (free > EXT4_XATTR_ROUND)
  85                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  86         else
  87                 free = 0;
  88
  89 out:
  90         return free;
  91 }
  92
  93 /*
  94  * Get the maximum size we now can store in an inode.
  95  * If we can't find the space for a xattr entry, don't use the space
  96  * of the extents since we have no space to indicate the inline data.
  97  */
  98 int ext4_get_max_inline_size(struct inode *inode)
  99 {
 100         int error, max_inline_size;
 101         struct ext4_iloc iloc;
 102
 103         if (EXT4_I(inode)->i_extra_isize == 0)
 104                 return 0;
 105
 106         error = ext4_get_inode_loc(inode, &iloc);
 107         if (error) {
 108                 ext4_error_inode(inode, __func__, __LINE__, 0,
 109                                  "can't get inode location %lu",
 110                                  inode->i_ino);
 111                 return 0;
 112         }
 113
 114         down_read(&EXT4_I(inode)->xattr_sem);
 115         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 116         up_read(&EXT4_I(inode)->xattr_sem);
 117
 118         brelse(iloc.bh);
 119
 120         if (!max_inline_size)
 121                 return 0;
 122
 123         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 124 }
 125
 126 /*
 127  * this function does not take xattr_sem, which is OK because it is
 128  * currently only used in a code path coming form ext4_iget, before
 129  * the new inode has been unlocked
 130  */
 131 int ext4_find_inline_data_nolock(struct inode *inode)
 132 {
 133         struct ext4_xattr_ibody_find is = {
 134                 .s = { .not_found = -ENODATA, },
 135         };
 136         struct ext4_xattr_info i = {
 137                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 138                 .name = EXT4_XATTR_SYSTEM_DATA,
 139         };
 140         int error;
 141
 142         if (EXT4_I(inode)->i_extra_isize == 0)
 143                 return 0;
 144
 145         error = ext4_get_inode_loc(inode, &is.iloc);
 146         if (error)
 147                 return error;
 148
 149         error = ext4_xattr_ibody_find(inode, &i, &is);
 150         if (error)
 151                 goto out;
 152
 153         if (!is.s.not_found) {
 154                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 155                                         (void *)ext4_raw_inode(&is.iloc));
 156                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 157                                 le32_to_cpu(is.s.here->e_value_size);
 158                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 159         }
 160 out:
 161         brelse(is.iloc.bh);
 162         return error;
 163 }
 164
 165 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 166                                  unsigned int len,
 167                                  struct ext4_iloc *iloc)
 168 {
 169         struct ext4_xattr_entry *entry;
 170         struct ext4_xattr_ibody_header *header;
 171         int cp_len = 0;
 172         struct ext4_inode *raw_inode;
 173
 174         if (!len)
 175                 return 0;
 176
 177         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 178
 179         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 180                         len : EXT4_MIN_INLINE_DATA_SIZE;
 181
 182         raw_inode = ext4_raw_inode(iloc);
 183         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 184
 185         len -= cp_len;
 186         buffer += cp_len;
 187
 188         if (!len)
 189                 goto out;
 190
 191         header = IHDR(inode, raw_inode);
 192         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 193                                             EXT4_I(inode)->i_inline_off);
 194         len = min_t(unsigned int, len,
 195                     (unsigned int)le32_to_cpu(entry->e_value_size));
 196
 197         memcpy(buffer,
 198                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 199         cp_len += len;
 200
 201 out:
 202         return cp_len;
 203 }
 204
 205 /*
 206  * write the buffer to the inline inode.
 207  * If 'create' is set, we don't need to do the extra copy in the xattr
 208  * value since it is already handled by ext4_xattr_ibody_inline_set.
 209  * That saves us one memcpy.
 210  */
 211 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 212                                    void *buffer, loff_t pos, unsigned int len)
 213 {
 214         struct ext4_xattr_entry *entry;
 215         struct ext4_xattr_ibody_header *header;
 216         struct ext4_inode *raw_inode;
 217         int cp_len = 0;
 218
 219         BUG_ON(!EXT4_I(inode)->i_inline_off);
 220         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 221
 222         raw_inode = ext4_raw_inode(iloc);
 223         buffer += pos;
 224
 225         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 226                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 227                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 228                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 229
 230                 len -= cp_len;
 231                 buffer += cp_len;
 232                 pos += cp_len;
 233         }
 234
 235         if (!len)
 236                 return;
 237
 238         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 239         header = IHDR(inode, raw_inode);
 240         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 241                                             EXT4_I(inode)->i_inline_off);
 242
 243         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 244                buffer, len);
 245 }
 246
 247 static int ext4_create_inline_data(handle_t *handle,
 248                                    struct inode *inode, unsigned len)
 249 {
 250         int error;
 251         void *value = NULL;
 252         struct ext4_xattr_ibody_find is = {
 253                 .s = { .not_found = -ENODATA, },
 254         };
 255         struct ext4_xattr_info i = {
 256                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 257                 .name = EXT4_XATTR_SYSTEM_DATA,
 258         };
 259
 260         error = ext4_get_inode_loc(inode, &is.iloc);
 261         if (error)
 262                 return error;
 263
 264         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 265         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 266         if (error)
 267                 goto out;
 268
 269         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 270                 value = EXT4_ZERO_XATTR_VALUE;
 271                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 272         } else {
 273                 value = "";
 274                 len = 0;
 275         }
 276
 277         /* Insert the the xttr entry. */
 278         i.value = value;
 279         i.value_len = len;
 280
 281         error = ext4_xattr_ibody_find(inode, &i, &is);
 282         if (error)
 283                 goto out;
 284
 285         BUG_ON(!is.s.not_found);
 286
 287         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 288         if (error) {
 289                 if (error == -ENOSPC)
 290                         ext4_clear_inode_state(inode,
 291                                                EXT4_STATE_MAY_INLINE_DATA);
 292                 goto out;
 293         }
 294
 295         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 296                 0, EXT4_MIN_INLINE_DATA_SIZE);
 297
 298         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 299                                       (void *)ext4_raw_inode(&is.iloc));
 300         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 301         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 302         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 303         get_bh(is.iloc.bh);
 304         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 305
 306 out:
 307         brelse(is.iloc.bh);
 308         return error;
 309 }
 310
 311 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 312                                    unsigned int len)
 313 {
 314         int error;
 315         void *value = NULL;
 316         struct ext4_xattr_ibody_find is = {
 317                 .s = { .not_found = -ENODATA, },
 318         };
 319         struct ext4_xattr_info i = {
 320                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 321                 .name = EXT4_XATTR_SYSTEM_DATA,
 322         };
 323
 324         /* If the old space is ok, write the data directly. */
 325         if (len <= EXT4_I(inode)->i_inline_size)
 326                 return 0;
 327
 328         error = ext4_get_inode_loc(inode, &is.iloc);
 329         if (error)
 330                 return error;
 331
 332         error = ext4_xattr_ibody_find(inode, &i, &is);
 333         if (error)
 334                 goto out;
 335
 336         BUG_ON(is.s.not_found);
 337
 338         len -= EXT4_MIN_INLINE_DATA_SIZE;
 339         value = kzalloc(len, GFP_NOFS);
 340         if (!value) {
 341                 error = -ENOMEM;
 342                 goto out;
 343         }
 344
 345         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 346                                      value, len);
 347         if (error == -ENODATA)
 348                 goto out;
 349
 350         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 351         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 352         if (error)
 353                 goto out;
 354
 355         /* Update the xttr entry. */
 356         i.value = value;
 357         i.value_len = len;
 358
 359         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 360         if (error)
 361                 goto out;
 362
 363         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 364                                       (void *)ext4_raw_inode(&is.iloc));
 365         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 366                                 le32_to_cpu(is.s.here->e_value_size);
 367         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 368         get_bh(is.iloc.bh);
 369         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 370
 371 out:
 372         kfree(value);
 373         brelse(is.iloc.bh);
 374         return error;
 375 }
 376
 377 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 378                                     unsigned int len)
 379 {
 380         int ret, size;
 381         struct ext4_inode_info *ei = EXT4_I(inode);
 382
 383         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 384                 return -ENOSPC;
 385
 386         size = ext4_get_max_inline_size(inode);
 387         if (size < len)
 388                 return -ENOSPC;
 389
 390         down_write(&EXT4_I(inode)->xattr_sem);
 391
 392         if (ei->i_inline_off)
 393                 ret = ext4_update_inline_data(handle, inode, len);
 394         else
 395                 ret = ext4_create_inline_data(handle, inode, len);
 396
 397         up_write(&EXT4_I(inode)->xattr_sem);
 398
 399         return ret;
 400 }
 401
 402 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 403                                            struct inode *inode)
 404 {
 405         struct ext4_inode_info *ei = EXT4_I(inode);
 406         struct ext4_xattr_ibody_find is = {
 407                 .s = { .not_found = 0, },
 408         };
 409         struct ext4_xattr_info i = {
 410                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 411                 .name = EXT4_XATTR_SYSTEM_DATA,
 412                 .value = NULL,
 413                 .value_len = 0,
 414         };
 415         int error;
 416
 417         if (!ei->i_inline_off)
 418                 return 0;
 419
 420         error = ext4_get_inode_loc(inode, &is.iloc);
 421         if (error)
 422                 return error;
 423
 424         error = ext4_xattr_ibody_find(inode, &i, &is);
 425         if (error)
 426                 goto out;
 427
 428         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 429         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 430         if (error)
 431                 goto out;
 432
 433         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 434         if (error)
 435                 goto out;
 436
 437         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 438                 0, EXT4_MIN_INLINE_DATA_SIZE);
 439
 440         if (ext4_has_feature_extents(inode->i_sb)) {
 441                 if (S_ISDIR(inode->i_mode) ||
 442                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 443                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 444                         ext4_ext_tree_init(handle, inode);
 445                 }
 446         }
 447         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 448
 449         get_bh(is.iloc.bh);
 450         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 451
 452         EXT4_I(inode)->i_inline_off = 0;
 453         EXT4_I(inode)->i_inline_size = 0;
 454         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 455 out:
 456         brelse(is.iloc.bh);
 457         if (error == -ENODATA)
 458                 error = 0;
 459         return error;
 460 }
 461
 462 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 463 {
 464         void *kaddr;
 465         int ret = 0;
 466         size_t len;
 467         struct ext4_iloc iloc;
 468
 469         BUG_ON(!PageLocked(page));
 470         BUG_ON(!ext4_has_inline_data(inode));
 471         BUG_ON(page->index);
 472
 473         if (!EXT4_I(inode)->i_inline_off) {
 474                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 475                              inode->i_ino);
 476                 goto out;
 477         }
 478
 479         ret = ext4_get_inode_loc(inode, &iloc);
 480         if (ret)
 481                 goto out;
 482
 483         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 484         kaddr = kmap_atomic(page);
 485         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 486         flush_dcache_page(page);
 487         kunmap_atomic(kaddr);
 488         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 489         SetPageUptodate(page);
 490         brelse(iloc.bh);
 491
 492 out:
 493         return ret;
 494 }
 495
 496 int ext4_readpage_inline(struct inode *inode, struct page *page)
 497 {
 498         int ret = 0;
 499
 500         down_read(&EXT4_I(inode)->xattr_sem);
 501         if (!ext4_has_inline_data(inode)) {
 502                 up_read(&EXT4_I(inode)->xattr_sem);
 503                 return -EAGAIN;
 504         }
 505
 506         trace_android_fs_dataread_start(inode, page_offset(page), PAGE_SIZE,
 507                                         current->pid, current->comm);
 508
 509         /*
 510          * Current inline data can only exist in the 1st page,
 511          * So for all the other pages, just set them uptodate.
 512          */
 513         if (!page->index)
 514                 ret = ext4_read_inline_page(inode, page);
 515         else if (!PageUptodate(page)) {
 516                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 517                 SetPageUptodate(page);
 518         }
 519
 520         trace_android_fs_dataread_end(inode, page_offset(page), PAGE_SIZE);
 521
 522         up_read(&EXT4_I(inode)->xattr_sem);
 523
 524         unlock_page(page);
 525         return ret >= 0 ? 0 : ret;
 526 }
 527
 528 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 529                                               struct inode *inode,
 530                                               unsigned flags)
 531 {
 532         int ret, needed_blocks;
 533         handle_t *handle = NULL;
 534         int retries = 0, sem_held = 0;
 535         struct page *page = NULL;
 536         unsigned from, to;
 537         struct ext4_iloc iloc;
 538
 539         if (!ext4_has_inline_data(inode)) {
 540                 /*
 541                  * clear the flag so that no new write
 542                  * will trap here again.
 543                  */
 544                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 545                 return 0;
 546         }
 547
 548         needed_blocks = ext4_writepage_trans_blocks(inode);
 549
 550         ret = ext4_get_inode_loc(inode, &iloc);
 551         if (ret)
 552                 return ret;
 553
 554 retry:
 555         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 556         if (IS_ERR(handle)) {
 557                 ret = PTR_ERR(handle);
 558                 handle = NULL;
 559                 goto out;
 560         }
 561
 562         /* We cannot recurse into the filesystem as the transaction is already
 563          * started */
 564         flags |= AOP_FLAG_NOFS;
 565
 566         page = grab_cache_page_write_begin(mapping, 0, flags);
 567         if (!page) {
 568                 ret = -ENOMEM;
 569                 goto out;
 570         }
 571
 572         down_write(&EXT4_I(inode)->xattr_sem);
 573         sem_held = 1;
 574         /* If some one has already done this for us, just exit. */
 575         if (!ext4_has_inline_data(inode)) {
 576                 ret = 0;
 577                 goto out;
 578         }
 579
 580         from = 0;
 581         to = ext4_get_inline_size(inode);
 582         if (!PageUptodate(page)) {
 583                 ret = ext4_read_inline_page(inode, page);
 584                 if (ret < 0)
 585                         goto out;
 586         }
 587
 588         ret = ext4_destroy_inline_data_nolock(handle, inode);
 589         if (ret)
 590                 goto out;
 591
 592         if (ext4_should_dioread_nolock(inode))
 593                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 594         else
 595                 ret = __block_write_begin(page, from, to, ext4_get_block);
 596
 597         if (!ret && ext4_should_journal_data(inode)) {
 598                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 599                                              from, to, NULL,
 600                                              do_journal_get_write_access);
 601         }
 602
 603         if (ret) {
 604                 unlock_page(page);
 605                 page_cache_release(page);
 606                 page = NULL;
 607                 ext4_orphan_add(handle, inode);
 608                 up_write(&EXT4_I(inode)->xattr_sem);
 609                 sem_held = 0;
 610                 ext4_journal_stop(handle);
 611                 handle = NULL;
 612                 ext4_truncate_failed_write(inode);
 613                 /*
 614                  * If truncate failed early the inode might
 615                  * still be on the orphan list; we need to
 616                  * make sure the inode is removed from the
 617                  * orphan list in that case.
 618                  */
 619                 if (inode->i_nlink)
 620                         ext4_orphan_del(NULL, inode);
 621         }
 622
 623         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 624                 goto retry;
 625
 626         if (page)
 627                 block_commit_write(page, from, to);
 628 out:
 629         if (page) {
 630                 unlock_page(page);
 631                 page_cache_release(page);
 632         }
 633         if (sem_held)
 634                 up_write(&EXT4_I(inode)->xattr_sem);
 635         if (handle)
 636                 ext4_journal_stop(handle);
 637         brelse(iloc.bh);
 638         return ret;
 639 }
 640
 641 /*
 642  * Try to write data in the inode.
 643  * If the inode has inline data, check whether the new write can be
 644  * in the inode also. If not, create the page the handle, move the data
 645  * to the page make it update and let the later codes create extent for it.
 646  */
 647 int ext4_try_to_write_inline_data(struct address_space *mapping,
 648                                   struct inode *inode,
 649                                   loff_t pos, unsigned len,
 650                                   unsigned flags,
 651                                   struct page **pagep)
 652 {
 653         int ret;
 654         handle_t *handle;
 655         struct page *page;
 656         struct ext4_iloc iloc;
 657
 658         if (pos + len > ext4_get_max_inline_size(inode))
 659                 goto convert;
 660
 661         ret = ext4_get_inode_loc(inode, &iloc);
 662         if (ret)
 663                 return ret;
 664
 665         /*
 666          * The possible write could happen in the inode,
 667          * so try to reserve the space in inode first.
 668          */
 669         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 670         if (IS_ERR(handle)) {
 671                 ret = PTR_ERR(handle);
 672                 handle = NULL;
 673                 goto out;
 674         }
 675
 676         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 677         if (ret && ret != -ENOSPC)
 678                 goto out;
 679
 680         /* We don't have space in inline inode, so convert it to extent. */
 681         if (ret == -ENOSPC) {
 682                 ext4_journal_stop(handle);
 683                 brelse(iloc.bh);
 684                 goto convert;
 685         }
 686
 687         flags |= AOP_FLAG_NOFS;
 688
 689         page = grab_cache_page_write_begin(mapping, 0, flags);
 690         if (!page) {
 691                 ret = -ENOMEM;
 692                 goto out;
 693         }
 694
 695         *pagep = page;
 696         down_read(&EXT4_I(inode)->xattr_sem);
 697         if (!ext4_has_inline_data(inode)) {
 698                 ret = 0;
 699                 unlock_page(page);
 700                 page_cache_release(page);
 701                 goto out_up_read;
 702         }
 703
 704         if (!PageUptodate(page)) {
 705                 ret = ext4_read_inline_page(inode, page);
 706                 if (ret < 0)
 707                         goto out_up_read;
 708         }
 709
 710         ret = 1;
 711         handle = NULL;
 712 out_up_read:
 713         up_read(&EXT4_I(inode)->xattr_sem);
 714 out:
 715         if (handle)
 716                 ext4_journal_stop(handle);
 717         brelse(iloc.bh);
 718         return ret;
 719 convert:
 720         return ext4_convert_inline_data_to_extent(mapping,
 721                                                   inode, flags);
 722 }
 723
 724 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 725                                unsigned copied, struct page *page)
 726 {
 727         int ret;
 728         void *kaddr;
 729         struct ext4_iloc iloc;
 730
 731         if (unlikely(copied < len)) {
 732                 if (!PageUptodate(page)) {
 733                         copied = 0;
 734                         goto out;
 735                 }
 736         }
 737
 738         ret = ext4_get_inode_loc(inode, &iloc);
 739         if (ret) {
 740                 ext4_std_error(inode->i_sb, ret);
 741                 copied = 0;
 742                 goto out;
 743         }
 744
 745         down_write(&EXT4_I(inode)->xattr_sem);
 746         BUG_ON(!ext4_has_inline_data(inode));
 747
 748         kaddr = kmap_atomic(page);
 749         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 750         kunmap_atomic(kaddr);
 751         SetPageUptodate(page);
 752         /* clear page dirty so that writepages wouldn't work for us. */
 753         ClearPageDirty(page);
 754
 755         up_write(&EXT4_I(inode)->xattr_sem);
 756         brelse(iloc.bh);
 757 out:
 758         return copied;
 759 }
 760
 761 struct buffer_head *
 762 ext4_journalled_write_inline_data(struct inode *inode,
 763                                   unsigned len,
 764                                   struct page *page)
 765 {
 766         int ret;
 767         void *kaddr;
 768         struct ext4_iloc iloc;
 769
 770         ret = ext4_get_inode_loc(inode, &iloc);
 771         if (ret) {
 772                 ext4_std_error(inode->i_sb, ret);
 773                 return NULL;
 774         }
 775
 776         down_write(&EXT4_I(inode)->xattr_sem);
 777         kaddr = kmap_atomic(page);
 778         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 779         kunmap_atomic(kaddr);
 780         up_write(&EXT4_I(inode)->xattr_sem);
 781
 782         return iloc.bh;
 783 }
 784
 785 /*
 786  * Try to make the page cache and handle ready for the inline data case.
 787  * We can call this function in 2 cases:
 788  * 1. The inode is created and the first write exceeds inline size. We can
 789  *    clear the inode state safely.
 790  * 2. The inode has inline data, then we need to read the data, make it
 791  *    update and dirty so that ext4_da_writepages can handle it. We don't
 792  *    need to start the journal since the file's metatdata isn't changed now.
 793  */
 794 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 795                                                  struct inode *inode,
 796                                                  unsigned flags,
 797                                                  void **fsdata)
 798 {
 799         int ret = 0, inline_size;
 800         struct page *page;
 801
 802         page = grab_cache_page_write_begin(mapping, 0, flags);
 803         if (!page)
 804                 return -ENOMEM;
 805
 806         down_read(&EXT4_I(inode)->xattr_sem);
 807         if (!ext4_has_inline_data(inode)) {
 808                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 809                 goto out;
 810         }
 811
 812         inline_size = ext4_get_inline_size(inode);
 813
 814         if (!PageUptodate(page)) {
 815                 ret = ext4_read_inline_page(inode, page);
 816                 if (ret < 0)
 817                         goto out;
 818         }
 819
 820         ret = __block_write_begin(page, 0, inline_size,
 821                                   ext4_da_get_block_prep);
 822         if (ret) {
 823                 up_read(&EXT4_I(inode)->xattr_sem);
 824                 unlock_page(page);
 825                 page_cache_release(page);
 826                 ext4_truncate_failed_write(inode);
 827                 return ret;
 828         }
 829
 830         SetPageDirty(page);
 831         SetPageUptodate(page);
 832         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 833         *fsdata = (void *)CONVERT_INLINE_DATA;
 834
 835 out:
 836         up_read(&EXT4_I(inode)->xattr_sem);
 837         if (page) {
 838                 unlock_page(page);
 839                 page_cache_release(page);
 840         }
 841         return ret;
 842 }
 843
 844 /*
 845  * Prepare the write for the inline data.
 846  * If the the data can be written into the inode, we just read
 847  * the page and make it uptodate, and start the journal.
 848  * Otherwise read the page, makes it dirty so that it can be
 849  * handle in writepages(the i_disksize update is left to the
 850  * normal ext4_da_write_end).
 851  */
 852 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 853                                     struct inode *inode,
 854                                     loff_t pos, unsigned len,
 855                                     unsigned flags,
 856                                     struct page **pagep,
 857                                     void **fsdata)
 858 {
 859         int ret, inline_size;
 860         handle_t *handle;
 861         struct page *page;
 862         struct ext4_iloc iloc;
 863         int retries;
 864
 865         ret = ext4_get_inode_loc(inode, &iloc);
 866         if (ret)
 867                 return ret;
 868
 869 retry_journal:
 870         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 871         if (IS_ERR(handle)) {
 872                 ret = PTR_ERR(handle);
 873                 goto out;
 874         }
 875
 876         inline_size = ext4_get_max_inline_size(inode);
 877
 878         ret = -ENOSPC;
 879         if (inline_size >= pos + len) {
 880                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 881                 if (ret && ret != -ENOSPC)
 882                         goto out_journal;
 883         }
 884
 885         /*
 886          * We cannot recurse into the filesystem as the transaction
 887          * is already started.
 888          */
 889         flags |= AOP_FLAG_NOFS;
 890
 891         if (ret == -ENOSPC) {
 892                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 893                                                             inode,
 894                                                             flags,
 895                                                             fsdata);
 896                 ext4_journal_stop(handle);
 897                 if (ret == -ENOSPC &&
 898                     ext4_should_retry_alloc(inode->i_sb, &retries))
 899                         goto retry_journal;
 900                 goto out;
 901         }
 902
 903
 904         page = grab_cache_page_write_begin(mapping, 0, flags);
 905         if (!page) {
 906                 ret = -ENOMEM;
 907                 goto out_journal;
 908         }
 909
 910         down_read(&EXT4_I(inode)->xattr_sem);
 911         if (!ext4_has_inline_data(inode)) {
 912                 ret = 0;
 913                 goto out_release_page;
 914         }
 915
 916         if (!PageUptodate(page)) {
 917                 ret = ext4_read_inline_page(inode, page);
 918                 if (ret < 0)
 919                         goto out_release_page;
 920         }
 921
 922         up_read(&EXT4_I(inode)->xattr_sem);
 923         *pagep = page;
 924         brelse(iloc.bh);
 925         return 1;
 926 out_release_page:
 927         up_read(&EXT4_I(inode)->xattr_sem);
 928         unlock_page(page);
 929         page_cache_release(page);
 930 out_journal:
 931         ext4_journal_stop(handle);
 932 out:
 933         brelse(iloc.bh);
 934         return ret;
 935 }
 936
 937 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 938                                   unsigned len, unsigned copied,
 939                                   struct page *page)
 940 {
 941         int i_size_changed = 0;
 942         int ret;
 943
 944         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 945         if (ret < 0) {
 946                 unlock_page(page);
 947                 put_page(page);
 948                 return ret;
 949         }
 950         copied = ret;
 951
 952         /*
 953          * No need to use i_size_read() here, the i_size
 954          * cannot change under us because we hold i_mutex.
 955          *
 956          * But it's important to update i_size while still holding page lock:
 957          * page writeout could otherwise come in and zero beyond i_size.
 958          */
 959         if (pos+copied > inode->i_size) {
 960                 i_size_write(inode, pos+copied);
 961                 i_size_changed = 1;
 962         }
 963         unlock_page(page);
 964         page_cache_release(page);
 965
 966         /*
 967          * Don't mark the inode dirty under page lock. First, it unnecessarily
 968          * makes the holding time of page lock longer. Second, it forces lock
 969          * ordering of page lock and transaction start for journaling
 970          * filesystems.
 971          */
 972         if (i_size_changed)
 973                 mark_inode_dirty(inode);
 974
 975         return copied;
 976 }
 977
 978 #ifdef INLINE_DIR_DEBUG
 979 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 980                           void *inline_start, int inline_size)
 981 {
 982         int offset;
 983         unsigned short de_len;
 984         struct ext4_dir_entry_2 *de = inline_start;
 985         void *dlimit = inline_start + inline_size;
 986
 987         trace_printk("inode %lu\n", dir->i_ino);
 988         offset = 0;
 989         while ((void *)de < dlimit) {
 990                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 991                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 992                              offset, de_len, de->name_len, de->name,
 993                              de->name_len, le32_to_cpu(de->inode));
 994                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 995                                          inline_start, inline_size, offset))
 996                         BUG();
 997
 998                 offset += de_len;
 999                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1000         }
1001 }
1002 #else
1003 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1004 #endif
1005
1006 /*
1007  * Add a new entry into a inline dir.
1008  * It will return -ENOSPC if no space is available, and -EIO
1009  * and -EEXIST if directory entry already exists.
1010  */
1011 static int ext4_add_dirent_to_inline(handle_t *handle,
1012                                      struct ext4_filename *fname,
1013                                      struct dentry *dentry,
1014                                      struct inode *inode,
1015                                      struct ext4_iloc *iloc,
1016                                      void *inline_start, int inline_size)
1017 {
1018         struct inode    *dir = d_inode(dentry->d_parent);
1019         int             err;
1020         struct ext4_dir_entry_2 *de;
1021
1022         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1023                                 inline_size, fname, &de);
1024         if (err)
1025                 return err;
1026
1027         BUFFER_TRACE(iloc->bh, "get_write_access");
1028         err = ext4_journal_get_write_access(handle, iloc->bh);
1029         if (err)
1030                 return err;
1031         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1032
1033         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1034
1035         /*
1036          * XXX shouldn't update any times until successful
1037          * completion of syscall, but too many callers depend
1038          * on this.
1039          *
1040          * XXX similarly, too many callers depend on
1041          * ext4_new_inode() setting the times, but error
1042          * recovery deletes the inode, so the worst that can
1043          * happen is that the times are slightly out of date
1044          * and/or different from the directory change time.
1045          */
1046         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1047         ext4_update_dx_flag(dir);
1048         dir->i_version++;
1049         ext4_mark_inode_dirty(handle, dir);
1050         return 1;
1051 }
1052
1053 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1054                                        struct ext4_iloc *iloc)
1055 {
1056         struct ext4_xattr_entry *entry;
1057         struct ext4_xattr_ibody_header *header;
1058
1059         BUG_ON(!EXT4_I(inode)->i_inline_off);
1060
1061         header = IHDR(inode, ext4_raw_inode(iloc));
1062         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1063                                             EXT4_I(inode)->i_inline_off);
1064
1065         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1066 }
1067
1068 /* Set the final de to cover the whole block. */
1069 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1070 {
1071         struct ext4_dir_entry_2 *de, *prev_de;
1072         void *limit;
1073         int de_len;
1074
1075         de = (struct ext4_dir_entry_2 *)de_buf;
1076         if (old_size) {
1077                 limit = de_buf + old_size;
1078                 do {
1079                         prev_de = de;
1080                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1081                         de_buf += de_len;
1082                         de = (struct ext4_dir_entry_2 *)de_buf;
1083                 } while (de_buf < limit);
1084
1085                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1086                                                         old_size, new_size);
1087         } else {
1088                 /* this is just created, so create an empty entry. */
1089                 de->inode = 0;
1090                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1091         }
1092 }
1093
1094 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1095                                   struct ext4_iloc *iloc)
1096 {
1097         int ret;
1098         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1099         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1100
1101         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1102                 return -ENOSPC;
1103
1104         ret = ext4_update_inline_data(handle, dir,
1105                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1106         if (ret)
1107                 return ret;
1108
1109         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1110                              EXT4_I(dir)->i_inline_size -
1111                                                 EXT4_MIN_INLINE_DATA_SIZE);
1112         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1113         return 0;
1114 }
1115
1116 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1117                                      struct ext4_iloc *iloc,
1118                                      void *buf, int inline_size)
1119 {
1120         ext4_create_inline_data(handle, inode, inline_size);
1121         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1122         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1123 }
1124
1125 static int ext4_finish_convert_inline_dir(handle_t *handle,
1126                                           struct inode *inode,
1127                                           struct buffer_head *dir_block,
1128                                           void *buf,
1129                                           int inline_size)
1130 {
1131         int err, csum_size = 0, header_size = 0;
1132         struct ext4_dir_entry_2 *de;
1133         struct ext4_dir_entry_tail *t;
1134         void *target = dir_block->b_data;
1135
1136         /*
1137          * First create "." and ".." and then copy the dir information
1138          * back to the block.
1139          */
1140         de = (struct ext4_dir_entry_2 *)target;
1141         de = ext4_init_dot_dotdot(inode, de,
1142                 inode->i_sb->s_blocksize, csum_size,
1143                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1144         header_size = (void *)de - target;
1145
1146         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1147                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1148
1149         if (ext4_has_metadata_csum(inode->i_sb))
1150                 csum_size = sizeof(struct ext4_dir_entry_tail);
1151
1152         inode->i_size = inode->i_sb->s_blocksize;
1153         i_size_write(inode, inode->i_sb->s_blocksize);
1154         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1155         ext4_update_final_de(dir_block->b_data,
1156                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1157                         inode->i_sb->s_blocksize - csum_size);
1158
1159         if (csum_size) {
1160                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1161                                      inode->i_sb->s_blocksize);
1162                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1163         }
1164         set_buffer_uptodate(dir_block);
1165         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1166         if (err)
1167                 goto out;
1168         set_buffer_verified(dir_block);
1169 out:
1170         return err;
1171 }
1172
1173 static int ext4_convert_inline_data_nolock(handle_t *handle,
1174                                            struct inode *inode,
1175                                            struct ext4_iloc *iloc)
1176 {
1177         int error;
1178         void *buf = NULL;
1179         struct buffer_head *data_bh = NULL;
1180         struct ext4_map_blocks map;
1181         int inline_size;
1182
1183         inline_size = ext4_get_inline_size(inode);
1184         buf = kmalloc(inline_size, GFP_NOFS);
1185         if (!buf) {
1186                 error = -ENOMEM;
1187                 goto out;
1188         }
1189
1190         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1191         if (error < 0)
1192                 goto out;
1193
1194         /*
1195          * Make sure the inline directory entries pass checks before we try to
1196          * convert them, so that we avoid touching stuff that needs fsck.
1197          */
1198         if (S_ISDIR(inode->i_mode)) {
1199                 error = ext4_check_all_de(inode, iloc->bh,
1200                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1201                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1202                 if (error)
1203                         goto out;
1204         }
1205
1206         error = ext4_destroy_inline_data_nolock(handle, inode);
1207         if (error)
1208                 goto out;
1209
1210         map.m_lblk = 0;
1211         map.m_len = 1;
1212         map.m_flags = 0;
1213         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1214         if (error < 0)
1215                 goto out_restore;
1216         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1217                 error = -EIO;
1218                 goto out_restore;
1219         }
1220
1221         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1222         if (!data_bh) {
1223                 error = -ENOMEM;
1224                 goto out_restore;
1225         }
1226
1227         lock_buffer(data_bh);
1228         error = ext4_journal_get_create_access(handle, data_bh);
1229         if (error) {
1230                 unlock_buffer(data_bh);
1231                 error = -EIO;
1232                 goto out_restore;
1233         }
1234         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1235
1236         if (!S_ISDIR(inode->i_mode)) {
1237                 memcpy(data_bh->b_data, buf, inline_size);
1238                 set_buffer_uptodate(data_bh);
1239                 error = ext4_handle_dirty_metadata(handle,
1240                                                    inode, data_bh);
1241         } else {
1242                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1243                                                        buf, inline_size);
1244         }
1245
1246         unlock_buffer(data_bh);
1247 out_restore:
1248         if (error)
1249                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1250
1251 out:
1252         brelse(data_bh);
1253         kfree(buf);
1254         return error;
1255 }
1256
1257 /*
1258  * Try to add the new entry to the inline data.
1259  * If succeeds, return 0. If not, extended the inline dir and copied data to
1260  * the new created block.
1261  */
1262 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1263                               struct dentry *dentry, struct inode *inode)
1264 {
1265         int ret, inline_size;
1266         void *inline_start;
1267         struct ext4_iloc iloc;
1268         struct inode *dir = d_inode(dentry->d_parent);
1269
1270         ret = ext4_get_inode_loc(dir, &iloc);
1271         if (ret)
1272                 return ret;
1273
1274         down_write(&EXT4_I(dir)->xattr_sem);
1275         if (!ext4_has_inline_data(dir))
1276                 goto out;
1277
1278         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1279                                                  EXT4_INLINE_DOTDOT_SIZE;
1280         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1281
1282         ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
1283                                         inline_start, inline_size);
1284         if (ret != -ENOSPC)
1285                 goto out;
1286
1287         /* check whether it can be inserted to inline xattr space. */
1288         inline_size = EXT4_I(dir)->i_inline_size -
1289                         EXT4_MIN_INLINE_DATA_SIZE;
1290         if (!inline_size) {
1291                 /* Try to use the xattr space.*/
1292                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1293                 if (ret && ret != -ENOSPC)
1294                         goto out;
1295
1296                 inline_size = EXT4_I(dir)->i_inline_size -
1297                                 EXT4_MIN_INLINE_DATA_SIZE;
1298         }
1299
1300         if (inline_size) {
1301                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1302
1303                 ret = ext4_add_dirent_to_inline(handle, fname, dentry,
1304                                                 inode, &iloc, inline_start,
1305                                                 inline_size);
1306
1307                 if (ret != -ENOSPC)
1308                         goto out;
1309         }
1310
1311         /*
1312          * The inline space is filled up, so create a new block for it.
1313          * As the extent tree will be created, we have to save the inline
1314          * dir first.
1315          */
1316         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1317
1318 out:
1319         ext4_mark_inode_dirty(handle, dir);
1320         up_write(&EXT4_I(dir)->xattr_sem);
1321         brelse(iloc.bh);
1322         return ret;
1323 }
1324
1325 /*
1326  * This function fills a red-black tree with information from an
1327  * inlined dir.  It returns the number directory entries loaded
1328  * into the tree.  If there is an error it is returned in err.
1329  */
1330 int htree_inlinedir_to_tree(struct file *dir_file,
1331                             struct inode *dir, ext4_lblk_t block,
1332                             struct dx_hash_info *hinfo,
1333                             __u32 start_hash, __u32 start_minor_hash,
1334                             int *has_inline_data)
1335 {
1336         int err = 0, count = 0;
1337         unsigned int parent_ino;
1338         int pos;
1339         struct ext4_dir_entry_2 *de;
1340         struct inode *inode = file_inode(dir_file);
1341         int ret, inline_size = 0;
1342         struct ext4_iloc iloc;
1343         void *dir_buf = NULL;
1344         struct ext4_dir_entry_2 fake;
1345         struct ext4_str tmp_str;
1346
1347         ret = ext4_get_inode_loc(inode, &iloc);
1348         if (ret)
1349                 return ret;
1350
1351         down_read(&EXT4_I(inode)->xattr_sem);
1352         if (!ext4_has_inline_data(inode)) {
1353                 up_read(&EXT4_I(inode)->xattr_sem);
1354                 *has_inline_data = 0;
1355                 goto out;
1356         }
1357
1358         inline_size = ext4_get_inline_size(inode);
1359         dir_buf = kmalloc(inline_size, GFP_NOFS);
1360         if (!dir_buf) {
1361                 ret = -ENOMEM;
1362                 up_read(&EXT4_I(inode)->xattr_sem);
1363                 goto out;
1364         }
1365
1366         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1367         up_read(&EXT4_I(inode)->xattr_sem);
1368         if (ret < 0)
1369                 goto out;
1370
1371         pos = 0;
1372         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1373         while (pos < inline_size) {
1374                 /*
1375                  * As inlined dir doesn't store any information about '.' and
1376                  * only the inode number of '..' is stored, we have to handle
1377                  * them differently.
1378                  */
1379                 if (pos == 0) {
1380                         fake.inode = cpu_to_le32(inode->i_ino);
1381                         fake.name_len = 1;
1382                         strcpy(fake.name, ".");
1383                         fake.rec_len = ext4_rec_len_to_disk(
1384                                                 EXT4_DIR_REC_LEN(fake.name_len),
1385                                                 inline_size);
1386                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1387                         de = &fake;
1388                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1389                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1390                         fake.inode = cpu_to_le32(parent_ino);
1391                         fake.name_len = 2;
1392                         strcpy(fake.name, "..");
1393                         fake.rec_len = ext4_rec_len_to_disk(
1394                                                 EXT4_DIR_REC_LEN(fake.name_len),
1395                                                 inline_size);
1396                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1397                         de = &fake;
1398                         pos = EXT4_INLINE_DOTDOT_SIZE;
1399                 } else {
1400                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1401                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1402                         if (ext4_check_dir_entry(inode, dir_file, de,
1403                                          iloc.bh, dir_buf,
1404                                          inline_size, pos)) {
1405                                 ret = count;
1406                                 goto out;
1407                         }
1408                 }
1409
1410                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1411                 if ((hinfo->hash < start_hash) ||
1412                     ((hinfo->hash == start_hash) &&
1413                      (hinfo->minor_hash < start_minor_hash)))
1414                         continue;
1415                 if (de->inode == 0)
1416                         continue;
1417                 tmp_str.name = de->name;
1418                 tmp_str.len = de->name_len;
1419                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1420                                               hinfo->minor_hash, de, &tmp_str);
1421                 if (err) {
1422                         count = err;
1423                         goto out;
1424                 }
1425                 count++;
1426         }
1427         ret = count;
1428 out:
1429         kfree(dir_buf);
1430         brelse(iloc.bh);
1431         return ret;
1432 }
1433
1434 /*
1435  * So this function is called when the volume is mkfsed with
1436  * dir_index disabled. In order to keep f_pos persistent
1437  * after we convert from an inlined dir to a blocked based,
1438  * we just pretend that we are a normal dir and return the
1439  * offset as if '.' and '..' really take place.
1440  *
1441  */
1442 int ext4_read_inline_dir(struct file *file,
1443                          struct dir_context *ctx,
1444                          int *has_inline_data)
1445 {
1446         unsigned int offset, parent_ino;
1447         int i;
1448         struct ext4_dir_entry_2 *de;
1449         struct super_block *sb;
1450         struct inode *inode = file_inode(file);
1451         int ret, inline_size = 0;
1452         struct ext4_iloc iloc;
1453         void *dir_buf = NULL;
1454         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1455
1456         ret = ext4_get_inode_loc(inode, &iloc);
1457         if (ret)
1458                 return ret;
1459
1460         down_read(&EXT4_I(inode)->xattr_sem);
1461         if (!ext4_has_inline_data(inode)) {
1462                 up_read(&EXT4_I(inode)->xattr_sem);
1463                 *has_inline_data = 0;
1464                 goto out;
1465         }
1466
1467         inline_size = ext4_get_inline_size(inode);
1468         dir_buf = kmalloc(inline_size, GFP_NOFS);
1469         if (!dir_buf) {
1470                 ret = -ENOMEM;
1471                 up_read(&EXT4_I(inode)->xattr_sem);
1472                 goto out;
1473         }
1474
1475         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1476         up_read(&EXT4_I(inode)->xattr_sem);
1477         if (ret < 0)
1478                 goto out;
1479
1480         ret = 0;
1481         sb = inode->i_sb;
1482         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1483         offset = ctx->pos;
1484
1485         /*
1486          * dotdot_offset and dotdot_size is the real offset and
1487          * size for ".." and "." if the dir is block based while
1488          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1489          * So we will use extra_offset and extra_size to indicate them
1490          * during the inline dir iteration.
1491          */
1492         dotdot_offset = EXT4_DIR_REC_LEN(1);
1493         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1494         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1495         extra_size = extra_offset + inline_size;
1496
1497         /*
1498          * If the version has changed since the last call to
1499          * readdir(2), then we might be pointing to an invalid
1500          * dirent right now.  Scan from the start of the inline
1501          * dir to make sure.
1502          */
1503         if (file->f_version != inode->i_version) {
1504                 for (i = 0; i < extra_size && i < offset;) {
1505                         /*
1506                          * "." is with offset 0 and
1507                          * ".." is dotdot_offset.
1508                          */
1509                         if (!i) {
1510                                 i = dotdot_offset;
1511                                 continue;
1512                         } else if (i == dotdot_offset) {
1513                                 i = dotdot_size;
1514                                 continue;
1515                         }
1516                         /* for other entry, the real offset in
1517                          * the buf has to be tuned accordingly.
1518                          */
1519                         de = (struct ext4_dir_entry_2 *)
1520                                 (dir_buf + i - extra_offset);
1521                         /* It's too expensive to do a full
1522                          * dirent test each time round this
1523                          * loop, but we do have to test at
1524                          * least that it is non-zero.  A
1525                          * failure will be detected in the
1526                          * dirent test below. */
1527                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1528                                 < EXT4_DIR_REC_LEN(1))
1529                                 break;
1530                         i += ext4_rec_len_from_disk(de->rec_len,
1531                                                     extra_size);
1532                 }
1533                 offset = i;
1534                 ctx->pos = offset;
1535                 file->f_version = inode->i_version;
1536         }
1537
1538         while (ctx->pos < extra_size) {
1539                 if (ctx->pos == 0) {
1540                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1541                                 goto out;
1542                         ctx->pos = dotdot_offset;
1543                         continue;
1544                 }
1545
1546                 if (ctx->pos == dotdot_offset) {
1547                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1548                                 goto out;
1549                         ctx->pos = dotdot_size;
1550                         continue;
1551                 }
1552
1553                 de = (struct ext4_dir_entry_2 *)
1554                         (dir_buf + ctx->pos - extra_offset);
1555                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1556                                          extra_size, ctx->pos))
1557                         goto out;
1558                 if (le32_to_cpu(de->inode)) {
1559                         if (!dir_emit(ctx, de->name, de->name_len,
1560                                       le32_to_cpu(de->inode),
1561                                       get_dtype(sb, de->file_type)))
1562                                 goto out;
1563                 }
1564                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1565         }
1566 out:
1567         kfree(dir_buf);
1568         brelse(iloc.bh);
1569         return ret;
1570 }
1571
1572 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1573                                         struct ext4_dir_entry_2 **parent_de,
1574                                         int *retval)
1575 {
1576         struct ext4_iloc iloc;
1577
1578         *retval = ext4_get_inode_loc(inode, &iloc);
1579         if (*retval)
1580                 return NULL;
1581
1582         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1583
1584         return iloc.bh;
1585 }
1586
1587 /*
1588  * Try to create the inline data for the new dir.
1589  * If it succeeds, return 0, otherwise return the error.
1590  * In case of ENOSPC, the caller should create the normal disk layout dir.
1591  */
1592 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1593                                struct inode *inode)
1594 {
1595         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1596         struct ext4_iloc iloc;
1597         struct ext4_dir_entry_2 *de;
1598
1599         ret = ext4_get_inode_loc(inode, &iloc);
1600         if (ret)
1601                 return ret;
1602
1603         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1604         if (ret)
1605                 goto out;
1606
1607         /*
1608          * For inline dir, we only save the inode information for the ".."
1609          * and create a fake dentry to cover the left space.
1610          */
1611         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1612         de->inode = cpu_to_le32(parent->i_ino);
1613         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1614         de->inode = 0;
1615         de->rec_len = ext4_rec_len_to_disk(
1616                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1617                                 inline_size);
1618         set_nlink(inode, 2);
1619         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1620 out:
1621         brelse(iloc.bh);
1622         return ret;
1623 }
1624
1625 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1626                                         struct ext4_filename *fname,
1627                                         const struct qstr *d_name,
1628                                         struct ext4_dir_entry_2 **res_dir,
1629                                         int *has_inline_data)
1630 {
1631         int ret;
1632         struct ext4_iloc iloc;
1633         void *inline_start;
1634         int inline_size;
1635
1636         if (ext4_get_inode_loc(dir, &iloc))
1637                 return NULL;
1638
1639         down_read(&EXT4_I(dir)->xattr_sem);
1640         if (!ext4_has_inline_data(dir)) {
1641                 *has_inline_data = 0;
1642                 goto out;
1643         }
1644
1645         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1646                                                 EXT4_INLINE_DOTDOT_SIZE;
1647         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
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         if (ret < 0)
1653                 goto out;
1654
1655         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1656                 goto out;
1657
1658         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1659         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1660
1661         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1662                               dir, fname, d_name, 0, res_dir);
1663         if (ret == 1)
1664                 goto out_find;
1665
1666 out:
1667         brelse(iloc.bh);
1668         iloc.bh = NULL;
1669 out_find:
1670         up_read(&EXT4_I(dir)->xattr_sem);
1671         return iloc.bh;
1672 }
1673
1674 int ext4_delete_inline_entry(handle_t *handle,
1675                              struct inode *dir,
1676                              struct ext4_dir_entry_2 *de_del,
1677                              struct buffer_head *bh,
1678                              int *has_inline_data)
1679 {
1680         int err, inline_size;
1681         struct ext4_iloc iloc;
1682         void *inline_start;
1683
1684         err = ext4_get_inode_loc(dir, &iloc);
1685         if (err)
1686                 return err;
1687
1688         down_write(&EXT4_I(dir)->xattr_sem);
1689         if (!ext4_has_inline_data(dir)) {
1690                 *has_inline_data = 0;
1691                 goto out;
1692         }
1693
1694         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1695                 EXT4_MIN_INLINE_DATA_SIZE) {
1696                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1697                                         EXT4_INLINE_DOTDOT_SIZE;
1698                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1699                                 EXT4_INLINE_DOTDOT_SIZE;
1700         } else {
1701                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1702                 inline_size = ext4_get_inline_size(dir) -
1703                                 EXT4_MIN_INLINE_DATA_SIZE;
1704         }
1705
1706         BUFFER_TRACE(bh, "get_write_access");
1707         err = ext4_journal_get_write_access(handle, bh);
1708         if (err)
1709                 goto out;
1710
1711         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1712                                         inline_start, inline_size, 0);
1713         if (err)
1714                 goto out;
1715
1716         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1717         err = ext4_mark_inode_dirty(handle, dir);
1718         if (unlikely(err))
1719                 goto out;
1720
1721         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1722 out:
1723         up_write(&EXT4_I(dir)->xattr_sem);
1724         brelse(iloc.bh);
1725         if (err != -ENOENT)
1726                 ext4_std_error(dir->i_sb, err);
1727         return err;
1728 }
1729
1730 /*
1731  * Get the inline dentry at offset.
1732  */
1733 static inline struct ext4_dir_entry_2 *
1734 ext4_get_inline_entry(struct inode *inode,
1735                       struct ext4_iloc *iloc,
1736                       unsigned int offset,
1737                       void **inline_start,
1738                       int *inline_size)
1739 {
1740         void *inline_pos;
1741
1742         BUG_ON(offset > ext4_get_inline_size(inode));
1743
1744         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1745                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1746                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1747         } else {
1748                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1749                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1750                 *inline_size = ext4_get_inline_size(inode) -
1751                                 EXT4_MIN_INLINE_DATA_SIZE;
1752         }
1753
1754         if (inline_start)
1755                 *inline_start = inline_pos;
1756         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1757 }
1758
1759 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1760 {
1761         int err, inline_size;
1762         struct ext4_iloc iloc;
1763         void *inline_pos;
1764         unsigned int offset;
1765         struct ext4_dir_entry_2 *de;
1766         int ret = 1;
1767
1768         err = ext4_get_inode_loc(dir, &iloc);
1769         if (err) {
1770                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1771                                  err, dir->i_ino);
1772                 return 1;
1773         }
1774
1775         down_read(&EXT4_I(dir)->xattr_sem);
1776         if (!ext4_has_inline_data(dir)) {
1777                 *has_inline_data = 0;
1778                 goto out;
1779         }
1780
1781         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1782         if (!le32_to_cpu(de->inode)) {
1783                 ext4_warning(dir->i_sb,
1784                              "bad inline directory (dir #%lu) - no `..'",
1785                              dir->i_ino);
1786                 ret = 1;
1787                 goto out;
1788         }
1789
1790         offset = EXT4_INLINE_DOTDOT_SIZE;
1791         while (offset < dir->i_size) {
1792                 de = ext4_get_inline_entry(dir, &iloc, offset,
1793                                            &inline_pos, &inline_size);
1794                 if (ext4_check_dir_entry(dir, NULL, de,
1795                                          iloc.bh, inline_pos,
1796                                          inline_size, offset)) {
1797                         ext4_warning(dir->i_sb,
1798                                      "bad inline directory (dir #%lu) - "
1799                                      "inode %u, rec_len %u, name_len %d"
1800                                      "inline size %d\n",
1801                                      dir->i_ino, le32_to_cpu(de->inode),
1802                                      le16_to_cpu(de->rec_len), de->name_len,
1803                                      inline_size);
1804                         ret = 1;
1805                         goto out;
1806                 }
1807                 if (le32_to_cpu(de->inode)) {
1808                         ret = 0;
1809                         goto out;
1810                 }
1811                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1812         }
1813
1814 out:
1815         up_read(&EXT4_I(dir)->xattr_sem);
1816         brelse(iloc.bh);
1817         return ret;
1818 }
1819
1820 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1821 {
1822         int ret;
1823
1824         down_write(&EXT4_I(inode)->xattr_sem);
1825         ret = ext4_destroy_inline_data_nolock(handle, inode);
1826         up_write(&EXT4_I(inode)->xattr_sem);
1827
1828         return ret;
1829 }
1830
1831 int ext4_inline_data_fiemap(struct inode *inode,
1832                             struct fiemap_extent_info *fieinfo,
1833                             int *has_inline, __u64 start, __u64 len)
1834 {
1835         __u64 physical = 0;
1836         __u64 inline_len;
1837         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1838                 FIEMAP_EXTENT_LAST;
1839         int error = 0;
1840         struct ext4_iloc iloc;
1841
1842         down_read(&EXT4_I(inode)->xattr_sem);
1843         if (!ext4_has_inline_data(inode)) {
1844                 *has_inline = 0;
1845                 goto out;
1846         }
1847         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1848                            i_size_read(inode));
1849         if (start >= inline_len)
1850                 goto out;
1851         if (start + len < inline_len)
1852                 inline_len = start + len;
1853         inline_len -= start;
1854
1855         error = ext4_get_inode_loc(inode, &iloc);
1856         if (error)
1857                 goto out;
1858
1859         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1860         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1861         physical += offsetof(struct ext4_inode, i_block);
1862
1863         if (physical)
1864                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1865                                                 inline_len, flags);
1866         brelse(iloc.bh);
1867 out:
1868         up_read(&EXT4_I(inode)->xattr_sem);
1869         return (error < 0 ? error : 0);
1870 }
1871
1872 /*
1873  * Called during xattr set, and if we can sparse space 'needed',
1874  * just create the extent tree evict the data to the outer block.
1875  *
1876  * We use jbd2 instead of page cache to move data to the 1st block
1877  * so that the whole transaction can be committed as a whole and
1878  * the data isn't lost because of the delayed page cache write.
1879  */
1880 int ext4_try_to_evict_inline_data(handle_t *handle,
1881                                   struct inode *inode,
1882                                   int needed)
1883 {
1884         int error;
1885         struct ext4_xattr_entry *entry;
1886         struct ext4_inode *raw_inode;
1887         struct ext4_iloc iloc;
1888
1889         error = ext4_get_inode_loc(inode, &iloc);
1890         if (error)
1891                 return error;
1892
1893         raw_inode = ext4_raw_inode(&iloc);
1894         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1895                                             EXT4_I(inode)->i_inline_off);
1896         if (EXT4_XATTR_LEN(entry->e_name_len) +
1897             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1898                 error = -ENOSPC;
1899                 goto out;
1900         }
1901
1902         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1903 out:
1904         brelse(iloc.bh);
1905         return error;
1906 }
1907
1908 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1909 {
1910         handle_t *handle;
1911         int inline_size, value_len, needed_blocks;
1912         size_t i_size;
1913         void *value = NULL;
1914         struct ext4_xattr_ibody_find is = {
1915                 .s = { .not_found = -ENODATA, },
1916         };
1917         struct ext4_xattr_info i = {
1918                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1919                 .name = EXT4_XATTR_SYSTEM_DATA,
1920         };
1921
1922
1923         needed_blocks = ext4_writepage_trans_blocks(inode);
1924         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1925         if (IS_ERR(handle))
1926                 return;
1927
1928         down_write(&EXT4_I(inode)->xattr_sem);
1929         if (!ext4_has_inline_data(inode)) {
1930                 *has_inline = 0;
1931                 ext4_journal_stop(handle);
1932                 return;
1933         }
1934
1935         if (ext4_orphan_add(handle, inode))
1936                 goto out;
1937
1938         if (ext4_get_inode_loc(inode, &is.iloc))
1939                 goto out;
1940
1941         down_write(&EXT4_I(inode)->i_data_sem);
1942         i_size = inode->i_size;
1943         inline_size = ext4_get_inline_size(inode);
1944         EXT4_I(inode)->i_disksize = i_size;
1945
1946         if (i_size < inline_size) {
1947                 /* Clear the content in the xattr space. */
1948                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1949                         if (ext4_xattr_ibody_find(inode, &i, &is))
1950                                 goto out_error;
1951
1952                         BUG_ON(is.s.not_found);
1953
1954                         value_len = le32_to_cpu(is.s.here->e_value_size);
1955                         value = kmalloc(value_len, GFP_NOFS);
1956                         if (!value)
1957                                 goto out_error;
1958
1959                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1960                                                 value, value_len))
1961                                 goto out_error;
1962
1963                         i.value = value;
1964                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1965                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1966                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1967                                 goto out_error;
1968                 }
1969
1970                 /* Clear the content within i_blocks. */
1971                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1972                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1973                         memset(p + i_size, 0,
1974                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1975                 }
1976
1977                 EXT4_I(inode)->i_inline_size = i_size <
1978                                         EXT4_MIN_INLINE_DATA_SIZE ?
1979                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1980         }
1981
1982 out_error:
1983         up_write(&EXT4_I(inode)->i_data_sem);
1984 out:
1985         brelse(is.iloc.bh);
1986         up_write(&EXT4_I(inode)->xattr_sem);
1987         kfree(value);
1988         if (inode->i_nlink)
1989                 ext4_orphan_del(handle, inode);
1990
1991         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1992         ext4_mark_inode_dirty(handle, inode);
1993         if (IS_SYNC(inode))
1994                 ext4_handle_sync(handle);
1995
1996         ext4_journal_stop(handle);
1997         return;
1998 }
1999
2000 int ext4_convert_inline_data(struct inode *inode)
2001 {
2002         int error, needed_blocks;
2003         handle_t *handle;
2004         struct ext4_iloc iloc;
2005
2006         if (!ext4_has_inline_data(inode)) {
2007                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2008                 return 0;
2009         }
2010
2011         needed_blocks = ext4_writepage_trans_blocks(inode);
2012
2013         iloc.bh = NULL;
2014         error = ext4_get_inode_loc(inode, &iloc);
2015         if (error)
2016                 return error;
2017
2018         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2019         if (IS_ERR(handle)) {
2020                 error = PTR_ERR(handle);
2021                 goto out_free;
2022         }
2023
2024         down_write(&EXT4_I(inode)->xattr_sem);
2025         if (!ext4_has_inline_data(inode)) {
2026                 up_write(&EXT4_I(inode)->xattr_sem);
2027                 goto out;
2028         }
2029
2030         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2031         up_write(&EXT4_I(inode)->xattr_sem);
2032 out:
2033         ext4_journal_stop(handle);
2034 out_free:
2035         brelse(iloc.bh);
2036         return error;
2037 }