fs/ext4/inline.c

   1 /*
   2  * Copyright (c) 2012 Taobao.
   3  * Written by Tao Ma <[email protected]>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/fiemap.h>
  16
  17 #include "ext4_jbd2.h"
  18 #include "ext4.h"
  19 #include "xattr.h"
  20 #include "truncate.h"
  21
  22 #define EXT4_XATTR_SYSTEM_DATA  "data"
  23 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  24 #define EXT4_INLINE_DOTDOT_OFFSET       2
  25 #define EXT4_INLINE_DOTDOT_SIZE         4
  26
  27 static int ext4_get_inline_size(struct inode *inode)
  28 {
  29         if (EXT4_I(inode)->i_inline_off)
  30                 return EXT4_I(inode)->i_inline_size;
  31
  32         return 0;
  33 }
  34
  35 static int get_max_inline_xattr_value_size(struct inode *inode,
  36                                            struct ext4_iloc *iloc)
  37 {
  38         struct ext4_xattr_ibody_header *header;
  39         struct ext4_xattr_entry *entry;
  40         struct ext4_inode *raw_inode;
  41         int free, min_offs;
  42
  43         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  44                         EXT4_GOOD_OLD_INODE_SIZE -
  45                         EXT4_I(inode)->i_extra_isize -
  46                         sizeof(struct ext4_xattr_ibody_header);
  47
  48         /*
  49          * We need to subtract another sizeof(__u32) since an in-inode xattr
  50          * needs an empty 4 bytes to indicate the gap between the xattr entry
  51          * and the name/value pair.
  52          */
  53         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  54                 return EXT4_XATTR_SIZE(min_offs -
  55                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  56                         EXT4_XATTR_ROUND - sizeof(__u32));
  57
  58         raw_inode = ext4_raw_inode(iloc);
  59         header = IHDR(inode, raw_inode);
  60         entry = IFIRST(header);
  61
  62         /* Compute min_offs. */
  63         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  64                 if (!entry->e_value_block && entry->e_value_size) {
  65                         size_t offs = le16_to_cpu(entry->e_value_offs);
  66                         if (offs < min_offs)
  67                                 min_offs = offs;
  68                 }
  69         }
  70         free = min_offs -
  71                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  72
  73         if (EXT4_I(inode)->i_inline_off) {
  74                 entry = (struct ext4_xattr_entry *)
  75                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  76
  77                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  78                 goto out;
  79         }
  80
  81         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  82
  83         if (free > EXT4_XATTR_ROUND)
  84                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  85         else
  86                 free = 0;
  87
  88 out:
  89         return free;
  90 }
  91
  92 /*
  93  * Get the maximum size we now can store in an inode.
  94  * If we can't find the space for a xattr entry, don't use the space
  95  * of the extents since we have no space to indicate the inline data.
  96  */
  97 int ext4_get_max_inline_size(struct inode *inode)
  98 {
  99         int error, max_inline_size;
 100         struct ext4_iloc iloc;
 101
 102         if (EXT4_I(inode)->i_extra_isize == 0)
 103                 return 0;
 104
 105         error = ext4_get_inode_loc(inode, &iloc);
 106         if (error) {
 107                 ext4_error_inode(inode, __func__, __LINE__, 0,
 108                                  "can't get inode location %lu",
 109                                  inode->i_ino);
 110                 return 0;
 111         }
 112
 113         down_read(&EXT4_I(inode)->xattr_sem);
 114         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 115         up_read(&EXT4_I(inode)->xattr_sem);
 116
 117         brelse(iloc.bh);
 118
 119         if (!max_inline_size)
 120                 return 0;
 121
 122         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 123 }
 124
 125 /*
 126  * this function does not take xattr_sem, which is OK because it is
 127  * currently only used in a code path coming form ext4_iget, before
 128  * the new inode has been unlocked
 129  */
 130 int ext4_find_inline_data_nolock(struct inode *inode)
 131 {
 132         struct ext4_xattr_ibody_find is = {
 133                 .s = { .not_found = -ENODATA, },
 134         };
 135         struct ext4_xattr_info i = {
 136                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 137                 .name = EXT4_XATTR_SYSTEM_DATA,
 138         };
 139         int error;
 140
 141         if (EXT4_I(inode)->i_extra_isize == 0)
 142                 return 0;
 143
 144         error = ext4_get_inode_loc(inode, &is.iloc);
 145         if (error)
 146                 return error;
 147
 148         error = ext4_xattr_ibody_find(inode, &i, &is);
 149         if (error)
 150                 goto out;
 151
 152         if (!is.s.not_found) {
 153                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 154                                         (void *)ext4_raw_inode(&is.iloc));
 155                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 156                                 le32_to_cpu(is.s.here->e_value_size);
 157                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 158         }
 159 out:
 160         brelse(is.iloc.bh);
 161         return error;
 162 }
 163
 164 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 165                                  unsigned int len,
 166                                  struct ext4_iloc *iloc)
 167 {
 168         struct ext4_xattr_entry *entry;
 169         struct ext4_xattr_ibody_header *header;
 170         int cp_len = 0;
 171         struct ext4_inode *raw_inode;
 172
 173         if (!len)
 174                 return 0;
 175
 176         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 177
 178         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 179                         len : EXT4_MIN_INLINE_DATA_SIZE;
 180
 181         raw_inode = ext4_raw_inode(iloc);
 182         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 183
 184         len -= cp_len;
 185         buffer += cp_len;
 186
 187         if (!len)
 188                 goto out;
 189
 190         header = IHDR(inode, raw_inode);
 191         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 192                                             EXT4_I(inode)->i_inline_off);
 193         len = min_t(unsigned int, len,
 194                     (unsigned int)le32_to_cpu(entry->e_value_size));
 195
 196         memcpy(buffer,
 197                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 198         cp_len += len;
 199
 200 out:
 201         return cp_len;
 202 }
 203
 204 /*
 205  * write the buffer to the inline inode.
 206  * If 'create' is set, we don't need to do the extra copy in the xattr
 207  * value since it is already handled by ext4_xattr_ibody_inline_set.
 208  * That saves us one memcpy.
 209  */
 210 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 211                                    void *buffer, loff_t pos, unsigned int len)
 212 {
 213         struct ext4_xattr_entry *entry;
 214         struct ext4_xattr_ibody_header *header;
 215         struct ext4_inode *raw_inode;
 216         int cp_len = 0;
 217
 218         BUG_ON(!EXT4_I(inode)->i_inline_off);
 219         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 220
 221         raw_inode = ext4_raw_inode(iloc);
 222         buffer += pos;
 223
 224         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 225                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 226                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 227                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 228
 229                 len -= cp_len;
 230                 buffer += cp_len;
 231                 pos += cp_len;
 232         }
 233
 234         if (!len)
 235                 return;
 236
 237         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 238         header = IHDR(inode, raw_inode);
 239         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 240                                             EXT4_I(inode)->i_inline_off);
 241
 242         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 243                buffer, len);
 244 }
 245
 246 static int ext4_create_inline_data(handle_t *handle,
 247                                    struct inode *inode, unsigned len)
 248 {
 249         int error;
 250         void *value = NULL;
 251         struct ext4_xattr_ibody_find is = {
 252                 .s = { .not_found = -ENODATA, },
 253         };
 254         struct ext4_xattr_info i = {
 255                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 256                 .name = EXT4_XATTR_SYSTEM_DATA,
 257         };
 258
 259         error = ext4_get_inode_loc(inode, &is.iloc);
 260         if (error)
 261                 return error;
 262
 263         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 264         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 265         if (error)
 266                 goto out;
 267
 268         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 269                 value = EXT4_ZERO_XATTR_VALUE;
 270                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 271         } else {
 272                 value = "";
 273                 len = 0;
 274         }
 275
 276         /* Insert the the xttr entry. */
 277         i.value = value;
 278         i.value_len = len;
 279
 280         error = ext4_xattr_ibody_find(inode, &i, &is);
 281         if (error)
 282                 goto out;
 283
 284         BUG_ON(!is.s.not_found);
 285
 286         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 287         if (error) {
 288                 if (error == -ENOSPC)
 289                         ext4_clear_inode_state(inode,
 290                                                EXT4_STATE_MAY_INLINE_DATA);
 291                 goto out;
 292         }
 293
 294         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 295                 0, EXT4_MIN_INLINE_DATA_SIZE);
 296
 297         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 298                                       (void *)ext4_raw_inode(&is.iloc));
 299         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 300         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 301         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 302         get_bh(is.iloc.bh);
 303         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 304
 305 out:
 306         brelse(is.iloc.bh);
 307         return error;
 308 }
 309
 310 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 311                                    unsigned int len)
 312 {
 313         int error;
 314         void *value = NULL;
 315         struct ext4_xattr_ibody_find is = {
 316                 .s = { .not_found = -ENODATA, },
 317         };
 318         struct ext4_xattr_info i = {
 319                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 320                 .name = EXT4_XATTR_SYSTEM_DATA,
 321         };
 322
 323         /* If the old space is ok, write the data directly. */
 324         if (len <= EXT4_I(inode)->i_inline_size)
 325                 return 0;
 326
 327         error = ext4_get_inode_loc(inode, &is.iloc);
 328         if (error)
 329                 return error;
 330
 331         error = ext4_xattr_ibody_find(inode, &i, &is);
 332         if (error)
 333                 goto out;
 334
 335         BUG_ON(is.s.not_found);
 336
 337         len -= EXT4_MIN_INLINE_DATA_SIZE;
 338         value = kzalloc(len, GFP_NOFS);
 339         if (!value)
 340                 goto out;
 341
 342         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 343                                      value, len);
 344         if (error == -ENODATA)
 345                 goto out;
 346
 347         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 348         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 349         if (error)
 350                 goto out;
 351
 352         /* Update the xttr entry. */
 353         i.value = value;
 354         i.value_len = len;
 355
 356         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 357         if (error)
 358                 goto out;
 359
 360         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 361                                       (void *)ext4_raw_inode(&is.iloc));
 362         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 363                                 le32_to_cpu(is.s.here->e_value_size);
 364         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 365         get_bh(is.iloc.bh);
 366         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 367
 368 out:
 369         kfree(value);
 370         brelse(is.iloc.bh);
 371         return error;
 372 }
 373
 374 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 375                                     unsigned int len)
 376 {
 377         int ret, size;
 378         struct ext4_inode_info *ei = EXT4_I(inode);
 379
 380         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 381                 return -ENOSPC;
 382
 383         size = ext4_get_max_inline_size(inode);
 384         if (size < len)
 385                 return -ENOSPC;
 386
 387         down_write(&EXT4_I(inode)->xattr_sem);
 388
 389         if (ei->i_inline_off)
 390                 ret = ext4_update_inline_data(handle, inode, len);
 391         else
 392                 ret = ext4_create_inline_data(handle, inode, len);
 393
 394         up_write(&EXT4_I(inode)->xattr_sem);
 395
 396         return ret;
 397 }
 398
 399 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 400                                            struct inode *inode)
 401 {
 402         struct ext4_inode_info *ei = EXT4_I(inode);
 403         struct ext4_xattr_ibody_find is = {
 404                 .s = { .not_found = 0, },
 405         };
 406         struct ext4_xattr_info i = {
 407                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 408                 .name = EXT4_XATTR_SYSTEM_DATA,
 409                 .value = NULL,
 410                 .value_len = 0,
 411         };
 412         int error;
 413
 414         if (!ei->i_inline_off)
 415                 return 0;
 416
 417         error = ext4_get_inode_loc(inode, &is.iloc);
 418         if (error)
 419                 return error;
 420
 421         error = ext4_xattr_ibody_find(inode, &i, &is);
 422         if (error)
 423                 goto out;
 424
 425         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 426         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 427         if (error)
 428                 goto out;
 429
 430         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 431         if (error)
 432                 goto out;
 433
 434         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 435                 0, EXT4_MIN_INLINE_DATA_SIZE);
 436
 437         if (ext4_has_feature_extents(inode->i_sb)) {
 438                 if (S_ISDIR(inode->i_mode) ||
 439                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 440                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 441                         ext4_ext_tree_init(handle, inode);
 442                 }
 443         }
 444         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 445
 446         get_bh(is.iloc.bh);
 447         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 448
 449         EXT4_I(inode)->i_inline_off = 0;
 450         EXT4_I(inode)->i_inline_size = 0;
 451         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 452 out:
 453         brelse(is.iloc.bh);
 454         if (error == -ENODATA)
 455                 error = 0;
 456         return error;
 457 }
 458
 459 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 460 {
 461         void *kaddr;
 462         int ret = 0;
 463         size_t len;
 464         struct ext4_iloc iloc;
 465
 466         BUG_ON(!PageLocked(page));
 467         BUG_ON(!ext4_has_inline_data(inode));
 468         BUG_ON(page->index);
 469
 470         if (!EXT4_I(inode)->i_inline_off) {
 471                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 472                              inode->i_ino);
 473                 goto out;
 474         }
 475
 476         ret = ext4_get_inode_loc(inode, &iloc);
 477         if (ret)
 478                 goto out;
 479
 480         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 481         kaddr = kmap_atomic(page);
 482         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 483         flush_dcache_page(page);
 484         kunmap_atomic(kaddr);
 485         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 486         SetPageUptodate(page);
 487         brelse(iloc.bh);
 488
 489 out:
 490         return ret;
 491 }
 492
 493 int ext4_readpage_inline(struct inode *inode, struct page *page)
 494 {
 495         int ret = 0;
 496
 497         down_read(&EXT4_I(inode)->xattr_sem);
 498         if (!ext4_has_inline_data(inode)) {
 499                 up_read(&EXT4_I(inode)->xattr_sem);
 500                 return -EAGAIN;
 501         }
 502
 503         /*
 504          * Current inline data can only exist in the 1st page,
 505          * So for all the other pages, just set them uptodate.
 506          */
 507         if (!page->index)
 508                 ret = ext4_read_inline_page(inode, page);
 509         else if (!PageUptodate(page)) {
 510                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 511                 SetPageUptodate(page);
 512         }
 513
 514         up_read(&EXT4_I(inode)->xattr_sem);
 515
 516         unlock_page(page);
 517         return ret >= 0 ? 0 : ret;
 518 }
 519
 520 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 521                                               struct inode *inode,
 522                                               unsigned flags)
 523 {
 524         int ret, needed_blocks;
 525         handle_t *handle = NULL;
 526         int retries = 0, sem_held = 0;
 527         struct page *page = NULL;
 528         unsigned from, to;
 529         struct ext4_iloc iloc;
 530
 531         if (!ext4_has_inline_data(inode)) {
 532                 /*
 533                  * clear the flag so that no new write
 534                  * will trap here again.
 535                  */
 536                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 537                 return 0;
 538         }
 539
 540         needed_blocks = ext4_writepage_trans_blocks(inode);
 541
 542         ret = ext4_get_inode_loc(inode, &iloc);
 543         if (ret)
 544                 return ret;
 545
 546 retry:
 547         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 548         if (IS_ERR(handle)) {
 549                 ret = PTR_ERR(handle);
 550                 handle = NULL;
 551                 goto out;
 552         }
 553
 554         /* We cannot recurse into the filesystem as the transaction is already
 555          * started */
 556         flags |= AOP_FLAG_NOFS;
 557
 558         page = grab_cache_page_write_begin(mapping, 0, flags);
 559         if (!page) {
 560                 ret = -ENOMEM;
 561                 goto out;
 562         }
 563
 564         down_write(&EXT4_I(inode)->xattr_sem);
 565         sem_held = 1;
 566         /* If some one has already done this for us, just exit. */
 567         if (!ext4_has_inline_data(inode)) {
 568                 ret = 0;
 569                 goto out;
 570         }
 571
 572         from = 0;
 573         to = ext4_get_inline_size(inode);
 574         if (!PageUptodate(page)) {
 575                 ret = ext4_read_inline_page(inode, page);
 576                 if (ret < 0)
 577                         goto out;
 578         }
 579
 580         ret = ext4_destroy_inline_data_nolock(handle, inode);
 581         if (ret)
 582                 goto out;
 583
 584         if (ext4_should_dioread_nolock(inode))
 585                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 586         else
 587                 ret = __block_write_begin(page, from, to, ext4_get_block);
 588
 589         if (!ret && ext4_should_journal_data(inode)) {
 590                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 591                                              from, to, NULL,
 592                                              do_journal_get_write_access);
 593         }
 594
 595         if (ret) {
 596                 unlock_page(page);
 597                 page_cache_release(page);
 598                 page = NULL;
 599                 ext4_orphan_add(handle, inode);
 600                 up_write(&EXT4_I(inode)->xattr_sem);
 601                 sem_held = 0;
 602                 ext4_journal_stop(handle);
 603                 handle = NULL;
 604                 ext4_truncate_failed_write(inode);
 605                 /*
 606                  * If truncate failed early the inode might
 607                  * still be on the orphan list; we need to
 608                  * make sure the inode is removed from the
 609                  * orphan list in that case.
 610                  */
 611                 if (inode->i_nlink)
 612                         ext4_orphan_del(NULL, inode);
 613         }
 614
 615         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 616                 goto retry;
 617
 618         if (page)
 619                 block_commit_write(page, from, to);
 620 out:
 621         if (page) {
 622                 unlock_page(page);
 623                 page_cache_release(page);
 624         }
 625         if (sem_held)
 626                 up_write(&EXT4_I(inode)->xattr_sem);
 627         if (handle)
 628                 ext4_journal_stop(handle);
 629         brelse(iloc.bh);
 630         return ret;
 631 }
 632
 633 /*
 634  * Try to write data in the inode.
 635  * If the inode has inline data, check whether the new write can be
 636  * in the inode also. If not, create the page the handle, move the data
 637  * to the page make it update and let the later codes create extent for it.
 638  */
 639 int ext4_try_to_write_inline_data(struct address_space *mapping,
 640                                   struct inode *inode,
 641                                   loff_t pos, unsigned len,
 642                                   unsigned flags,
 643                                   struct page **pagep)
 644 {
 645         int ret;
 646         handle_t *handle;
 647         struct page *page;
 648         struct ext4_iloc iloc;
 649
 650         if (pos + len > ext4_get_max_inline_size(inode))
 651                 goto convert;
 652
 653         ret = ext4_get_inode_loc(inode, &iloc);
 654         if (ret)
 655                 return ret;
 656
 657         /*
 658          * The possible write could happen in the inode,
 659          * so try to reserve the space in inode first.
 660          */
 661         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 662         if (IS_ERR(handle)) {
 663                 ret = PTR_ERR(handle);
 664                 handle = NULL;
 665                 goto out;
 666         }
 667
 668         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 669         if (ret && ret != -ENOSPC)
 670                 goto out;
 671
 672         /* We don't have space in inline inode, so convert it to extent. */
 673         if (ret == -ENOSPC) {
 674                 ext4_journal_stop(handle);
 675                 brelse(iloc.bh);
 676                 goto convert;
 677         }
 678
 679         flags |= AOP_FLAG_NOFS;
 680
 681         page = grab_cache_page_write_begin(mapping, 0, flags);
 682         if (!page) {
 683                 ret = -ENOMEM;
 684                 goto out;
 685         }
 686
 687         *pagep = page;
 688         down_read(&EXT4_I(inode)->xattr_sem);
 689         if (!ext4_has_inline_data(inode)) {
 690                 ret = 0;
 691                 unlock_page(page);
 692                 page_cache_release(page);
 693                 goto out_up_read;
 694         }
 695
 696         if (!PageUptodate(page)) {
 697                 ret = ext4_read_inline_page(inode, page);
 698                 if (ret < 0)
 699                         goto out_up_read;
 700         }
 701
 702         ret = 1;
 703         handle = NULL;
 704 out_up_read:
 705         up_read(&EXT4_I(inode)->xattr_sem);
 706 out:
 707         if (handle)
 708                 ext4_journal_stop(handle);
 709         brelse(iloc.bh);
 710         return ret;
 711 convert:
 712         return ext4_convert_inline_data_to_extent(mapping,
 713                                                   inode, flags);
 714 }
 715
 716 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 717                                unsigned copied, struct page *page)
 718 {
 719         int ret;
 720         void *kaddr;
 721         struct ext4_iloc iloc;
 722
 723         if (unlikely(copied < len)) {
 724                 if (!PageUptodate(page)) {
 725                         copied = 0;
 726                         goto out;
 727                 }
 728         }
 729
 730         ret = ext4_get_inode_loc(inode, &iloc);
 731         if (ret) {
 732                 ext4_std_error(inode->i_sb, ret);
 733                 copied = 0;
 734                 goto out;
 735         }
 736
 737         down_write(&EXT4_I(inode)->xattr_sem);
 738         BUG_ON(!ext4_has_inline_data(inode));
 739
 740         kaddr = kmap_atomic(page);
 741         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 742         kunmap_atomic(kaddr);
 743         SetPageUptodate(page);
 744         /* clear page dirty so that writepages wouldn't work for us. */
 745         ClearPageDirty(page);
 746
 747         up_write(&EXT4_I(inode)->xattr_sem);
 748         brelse(iloc.bh);
 749 out:
 750         return copied;
 751 }
 752
 753 struct buffer_head *
 754 ext4_journalled_write_inline_data(struct inode *inode,
 755                                   unsigned len,
 756                                   struct page *page)
 757 {
 758         int ret;
 759         void *kaddr;
 760         struct ext4_iloc iloc;
 761
 762         ret = ext4_get_inode_loc(inode, &iloc);
 763         if (ret) {
 764                 ext4_std_error(inode->i_sb, ret);
 765                 return NULL;
 766         }
 767
 768         down_write(&EXT4_I(inode)->xattr_sem);
 769         kaddr = kmap_atomic(page);
 770         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 771         kunmap_atomic(kaddr);
 772         up_write(&EXT4_I(inode)->xattr_sem);
 773
 774         return iloc.bh;
 775 }
 776
 777 /*
 778  * Try to make the page cache and handle ready for the inline data case.
 779  * We can call this function in 2 cases:
 780  * 1. The inode is created and the first write exceeds inline size. We can
 781  *    clear the inode state safely.
 782  * 2. The inode has inline data, then we need to read the data, make it
 783  *    update and dirty so that ext4_da_writepages can handle it. We don't
 784  *    need to start the journal since the file's metatdata isn't changed now.
 785  */
 786 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 787                                                  struct inode *inode,
 788                                                  unsigned flags,
 789                                                  void **fsdata)
 790 {
 791         int ret = 0, inline_size;
 792         struct page *page;
 793
 794         page = grab_cache_page_write_begin(mapping, 0, flags);
 795         if (!page)
 796                 return -ENOMEM;
 797
 798         down_read(&EXT4_I(inode)->xattr_sem);
 799         if (!ext4_has_inline_data(inode)) {
 800                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 801                 goto out;
 802         }
 803
 804         inline_size = ext4_get_inline_size(inode);
 805
 806         if (!PageUptodate(page)) {
 807                 ret = ext4_read_inline_page(inode, page);
 808                 if (ret < 0)
 809                         goto out;
 810         }
 811
 812         ret = __block_write_begin(page, 0, inline_size,
 813                                   ext4_da_get_block_prep);
 814         if (ret) {
 815                 up_read(&EXT4_I(inode)->xattr_sem);
 816                 unlock_page(page);
 817                 page_cache_release(page);
 818                 ext4_truncate_failed_write(inode);
 819                 return ret;
 820         }
 821
 822         SetPageDirty(page);
 823         SetPageUptodate(page);
 824         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 825         *fsdata = (void *)CONVERT_INLINE_DATA;
 826
 827 out:
 828         up_read(&EXT4_I(inode)->xattr_sem);
 829         if (page) {
 830                 unlock_page(page);
 831                 page_cache_release(page);
 832         }
 833         return ret;
 834 }
 835
 836 /*
 837  * Prepare the write for the inline data.
 838  * If the the data can be written into the inode, we just read
 839  * the page and make it uptodate, and start the journal.
 840  * Otherwise read the page, makes it dirty so that it can be
 841  * handle in writepages(the i_disksize update is left to the
 842  * normal ext4_da_write_end).
 843  */
 844 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 845                                     struct inode *inode,
 846                                     loff_t pos, unsigned len,
 847                                     unsigned flags,
 848                                     struct page **pagep,
 849                                     void **fsdata)
 850 {
 851         int ret, inline_size;
 852         handle_t *handle;
 853         struct page *page;
 854         struct ext4_iloc iloc;
 855         int retries;
 856
 857         ret = ext4_get_inode_loc(inode, &iloc);
 858         if (ret)
 859                 return ret;
 860
 861 retry_journal:
 862         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 863         if (IS_ERR(handle)) {
 864                 ret = PTR_ERR(handle);
 865                 goto out;
 866         }
 867
 868         inline_size = ext4_get_max_inline_size(inode);
 869
 870         ret = -ENOSPC;
 871         if (inline_size >= pos + len) {
 872                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 873                 if (ret && ret != -ENOSPC)
 874                         goto out_journal;
 875         }
 876
 877         /*
 878          * We cannot recurse into the filesystem as the transaction
 879          * is already started.
 880          */
 881         flags |= AOP_FLAG_NOFS;
 882
 883         if (ret == -ENOSPC) {
 884                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 885                                                             inode,
 886                                                             flags,
 887                                                             fsdata);
 888                 ext4_journal_stop(handle);
 889                 if (ret == -ENOSPC &&
 890                     ext4_should_retry_alloc(inode->i_sb, &retries))
 891                         goto retry_journal;
 892                 goto out;
 893         }
 894
 895
 896         page = grab_cache_page_write_begin(mapping, 0, flags);
 897         if (!page) {
 898                 ret = -ENOMEM;
 899                 goto out_journal;
 900         }
 901
 902         down_read(&EXT4_I(inode)->xattr_sem);
 903         if (!ext4_has_inline_data(inode)) {
 904                 ret = 0;
 905                 goto out_release_page;
 906         }
 907
 908         if (!PageUptodate(page)) {
 909                 ret = ext4_read_inline_page(inode, page);
 910                 if (ret < 0)
 911                         goto out_release_page;
 912         }
 913
 914         up_read(&EXT4_I(inode)->xattr_sem);
 915         *pagep = page;
 916         brelse(iloc.bh);
 917         return 1;
 918 out_release_page:
 919         up_read(&EXT4_I(inode)->xattr_sem);
 920         unlock_page(page);
 921         page_cache_release(page);
 922 out_journal:
 923         ext4_journal_stop(handle);
 924 out:
 925         brelse(iloc.bh);
 926         return ret;
 927 }
 928
 929 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 930                                   unsigned len, unsigned copied,
 931                                   struct page *page)
 932 {
 933         int i_size_changed = 0;
 934
 935         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 936
 937         /*
 938          * No need to use i_size_read() here, the i_size
 939          * cannot change under us because we hold i_mutex.
 940          *
 941          * But it's important to update i_size while still holding page lock:
 942          * page writeout could otherwise come in and zero beyond i_size.
 943          */
 944         if (pos+copied > inode->i_size) {
 945                 i_size_write(inode, pos+copied);
 946                 i_size_changed = 1;
 947         }
 948         unlock_page(page);
 949         page_cache_release(page);
 950
 951         /*
 952          * Don't mark the inode dirty under page lock. First, it unnecessarily
 953          * makes the holding time of page lock longer. Second, it forces lock
 954          * ordering of page lock and transaction start for journaling
 955          * filesystems.
 956          */
 957         if (i_size_changed)
 958                 mark_inode_dirty(inode);
 959
 960         return copied;
 961 }
 962
 963 #ifdef INLINE_DIR_DEBUG
 964 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 965                           void *inline_start, int inline_size)
 966 {
 967         int offset;
 968         unsigned short de_len;
 969         struct ext4_dir_entry_2 *de = inline_start;
 970         void *dlimit = inline_start + inline_size;
 971
 972         trace_printk("inode %lu\n", dir->i_ino);
 973         offset = 0;
 974         while ((void *)de < dlimit) {
 975                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 976                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 977                              offset, de_len, de->name_len, de->name,
 978                              de->name_len, le32_to_cpu(de->inode));
 979                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 980                                          inline_start, inline_size, offset))
 981                         BUG();
 982
 983                 offset += de_len;
 984                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 985         }
 986 }
 987 #else
 988 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 989 #endif
 990
 991 /*
 992  * Add a new entry into a inline dir.
 993  * It will return -ENOSPC if no space is available, and -EIO
 994  * and -EEXIST if directory entry already exists.
 995  */
 996 static int ext4_add_dirent_to_inline(handle_t *handle,
 997                                      struct ext4_filename *fname,
 998                                      struct inode *dir,
 999                                      struct inode *inode,
1000                                      struct ext4_iloc *iloc,
1001                                      void *inline_start, int inline_size)
1002 {
1003         int             err;
1004         struct ext4_dir_entry_2 *de;
1005
1006         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1007                                 inline_size, fname, &de);
1008         if (err)
1009                 return err;
1010
1011         BUFFER_TRACE(iloc->bh, "get_write_access");
1012         err = ext4_journal_get_write_access(handle, iloc->bh);
1013         if (err)
1014                 return err;
1015         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1016
1017         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1018
1019         /*
1020          * XXX shouldn't update any times until successful
1021          * completion of syscall, but too many callers depend
1022          * on this.
1023          *
1024          * XXX similarly, too many callers depend on
1025          * ext4_new_inode() setting the times, but error
1026          * recovery deletes the inode, so the worst that can
1027          * happen is that the times are slightly out of date
1028          * and/or different from the directory change time.
1029          */
1030         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1031         ext4_update_dx_flag(dir);
1032         dir->i_version++;
1033         ext4_mark_inode_dirty(handle, dir);
1034         return 1;
1035 }
1036
1037 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1038                                        struct ext4_iloc *iloc)
1039 {
1040         struct ext4_xattr_entry *entry;
1041         struct ext4_xattr_ibody_header *header;
1042
1043         BUG_ON(!EXT4_I(inode)->i_inline_off);
1044
1045         header = IHDR(inode, ext4_raw_inode(iloc));
1046         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1047                                             EXT4_I(inode)->i_inline_off);
1048
1049         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1050 }
1051
1052 /* Set the final de to cover the whole block. */
1053 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1054 {
1055         struct ext4_dir_entry_2 *de, *prev_de;
1056         void *limit;
1057         int de_len;
1058
1059         de = (struct ext4_dir_entry_2 *)de_buf;
1060         if (old_size) {
1061                 limit = de_buf + old_size;
1062                 do {
1063                         prev_de = de;
1064                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1065                         de_buf += de_len;
1066                         de = (struct ext4_dir_entry_2 *)de_buf;
1067                 } while (de_buf < limit);
1068
1069                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1070                                                         old_size, new_size);
1071         } else {
1072                 /* this is just created, so create an empty entry. */
1073                 de->inode = 0;
1074                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1075         }
1076 }
1077
1078 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1079                                   struct ext4_iloc *iloc)
1080 {
1081         int ret;
1082         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1083         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1084
1085         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1086                 return -ENOSPC;
1087
1088         ret = ext4_update_inline_data(handle, dir,
1089                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1090         if (ret)
1091                 return ret;
1092
1093         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1094                              EXT4_I(dir)->i_inline_size -
1095                                                 EXT4_MIN_INLINE_DATA_SIZE);
1096         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1097         return 0;
1098 }
1099
1100 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1101                                      struct ext4_iloc *iloc,
1102                                      void *buf, int inline_size)
1103 {
1104         ext4_create_inline_data(handle, inode, inline_size);
1105         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1106         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1107 }
1108
1109 static int ext4_finish_convert_inline_dir(handle_t *handle,
1110                                           struct inode *inode,
1111                                           struct buffer_head *dir_block,
1112                                           void *buf,
1113                                           int inline_size)
1114 {
1115         int err, csum_size = 0, header_size = 0;
1116         struct ext4_dir_entry_2 *de;
1117         struct ext4_dir_entry_tail *t;
1118         void *target = dir_block->b_data;
1119
1120         /*
1121          * First create "." and ".." and then copy the dir information
1122          * back to the block.
1123          */
1124         de = (struct ext4_dir_entry_2 *)target;
1125         de = ext4_init_dot_dotdot(inode, de,
1126                 inode->i_sb->s_blocksize, csum_size,
1127                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1128         header_size = (void *)de - target;
1129
1130         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1131                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1132
1133         if (ext4_has_metadata_csum(inode->i_sb))
1134                 csum_size = sizeof(struct ext4_dir_entry_tail);
1135
1136         inode->i_size = inode->i_sb->s_blocksize;
1137         i_size_write(inode, inode->i_sb->s_blocksize);
1138         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1139         ext4_update_final_de(dir_block->b_data,
1140                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1141                         inode->i_sb->s_blocksize - csum_size);
1142
1143         if (csum_size) {
1144                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1145                                      inode->i_sb->s_blocksize);
1146                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1147         }
1148         set_buffer_uptodate(dir_block);
1149         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1150         if (err)
1151                 goto out;
1152         set_buffer_verified(dir_block);
1153 out:
1154         return err;
1155 }
1156
1157 static int ext4_convert_inline_data_nolock(handle_t *handle,
1158                                            struct inode *inode,
1159                                            struct ext4_iloc *iloc)
1160 {
1161         int error;
1162         void *buf = NULL;
1163         struct buffer_head *data_bh = NULL;
1164         struct ext4_map_blocks map;
1165         int inline_size;
1166
1167         inline_size = ext4_get_inline_size(inode);
1168         buf = kmalloc(inline_size, GFP_NOFS);
1169         if (!buf) {
1170                 error = -ENOMEM;
1171                 goto out;
1172         }
1173
1174         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1175         if (error < 0)
1176                 goto out;
1177
1178         /*
1179          * Make sure the inline directory entries pass checks before we try to
1180          * convert them, so that we avoid touching stuff that needs fsck.
1181          */
1182         if (S_ISDIR(inode->i_mode)) {
1183                 error = ext4_check_all_de(inode, iloc->bh,
1184                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1185                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1186                 if (error)
1187                         goto out;
1188         }
1189
1190         error = ext4_destroy_inline_data_nolock(handle, inode);
1191         if (error)
1192                 goto out;
1193
1194         map.m_lblk = 0;
1195         map.m_len = 1;
1196         map.m_flags = 0;
1197         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1198         if (error < 0)
1199                 goto out_restore;
1200         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1201                 error = -EIO;
1202                 goto out_restore;
1203         }
1204
1205         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1206         if (!data_bh) {
1207                 error = -ENOMEM;
1208                 goto out_restore;
1209         }
1210
1211         lock_buffer(data_bh);
1212         error = ext4_journal_get_create_access(handle, data_bh);
1213         if (error) {
1214                 unlock_buffer(data_bh);
1215                 error = -EIO;
1216                 goto out_restore;
1217         }
1218         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1219
1220         if (!S_ISDIR(inode->i_mode)) {
1221                 memcpy(data_bh->b_data, buf, inline_size);
1222                 set_buffer_uptodate(data_bh);
1223                 error = ext4_handle_dirty_metadata(handle,
1224                                                    inode, data_bh);
1225         } else {
1226                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1227                                                        buf, inline_size);
1228         }
1229
1230         unlock_buffer(data_bh);
1231 out_restore:
1232         if (error)
1233                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1234
1235 out:
1236         brelse(data_bh);
1237         kfree(buf);
1238         return error;
1239 }
1240
1241 /*
1242  * Try to add the new entry to the inline data.
1243  * If succeeds, return 0. If not, extended the inline dir and copied data to
1244  * the new created block.
1245  */
1246 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1247                               struct inode *dir, struct inode *inode)
1248 {
1249         int ret, inline_size;
1250         void *inline_start;
1251         struct ext4_iloc iloc;
1252
1253         ret = ext4_get_inode_loc(dir, &iloc);
1254         if (ret)
1255                 return ret;
1256
1257         down_write(&EXT4_I(dir)->xattr_sem);
1258         if (!ext4_has_inline_data(dir))
1259                 goto out;
1260
1261         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1262                                                  EXT4_INLINE_DOTDOT_SIZE;
1263         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1264
1265         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1266                                         inline_start, inline_size);
1267         if (ret != -ENOSPC)
1268                 goto out;
1269
1270         /* check whether it can be inserted to inline xattr space. */
1271         inline_size = EXT4_I(dir)->i_inline_size -
1272                         EXT4_MIN_INLINE_DATA_SIZE;
1273         if (!inline_size) {
1274                 /* Try to use the xattr space.*/
1275                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1276                 if (ret && ret != -ENOSPC)
1277                         goto out;
1278
1279                 inline_size = EXT4_I(dir)->i_inline_size -
1280                                 EXT4_MIN_INLINE_DATA_SIZE;
1281         }
1282
1283         if (inline_size) {
1284                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1285
1286                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1287                                                 inode, &iloc, inline_start,
1288                                                 inline_size);
1289
1290                 if (ret != -ENOSPC)
1291                         goto out;
1292         }
1293
1294         /*
1295          * The inline space is filled up, so create a new block for it.
1296          * As the extent tree will be created, we have to save the inline
1297          * dir first.
1298          */
1299         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1300
1301 out:
1302         ext4_mark_inode_dirty(handle, dir);
1303         up_write(&EXT4_I(dir)->xattr_sem);
1304         brelse(iloc.bh);
1305         return ret;
1306 }
1307
1308 /*
1309  * This function fills a red-black tree with information from an
1310  * inlined dir.  It returns the number directory entries loaded
1311  * into the tree.  If there is an error it is returned in err.
1312  */
1313 int htree_inlinedir_to_tree(struct file *dir_file,
1314                             struct inode *dir, ext4_lblk_t block,
1315                             struct dx_hash_info *hinfo,
1316                             __u32 start_hash, __u32 start_minor_hash,
1317                             int *has_inline_data)
1318 {
1319         int err = 0, count = 0;
1320         unsigned int parent_ino;
1321         int pos;
1322         struct ext4_dir_entry_2 *de;
1323         struct inode *inode = file_inode(dir_file);
1324         int ret, inline_size = 0;
1325         struct ext4_iloc iloc;
1326         void *dir_buf = NULL;
1327         struct ext4_dir_entry_2 fake;
1328         struct ext4_str tmp_str;
1329
1330         ret = ext4_get_inode_loc(inode, &iloc);
1331         if (ret)
1332                 return ret;
1333
1334         down_read(&EXT4_I(inode)->xattr_sem);
1335         if (!ext4_has_inline_data(inode)) {
1336                 up_read(&EXT4_I(inode)->xattr_sem);
1337                 *has_inline_data = 0;
1338                 goto out;
1339         }
1340
1341         inline_size = ext4_get_inline_size(inode);
1342         dir_buf = kmalloc(inline_size, GFP_NOFS);
1343         if (!dir_buf) {
1344                 ret = -ENOMEM;
1345                 up_read(&EXT4_I(inode)->xattr_sem);
1346                 goto out;
1347         }
1348
1349         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1350         up_read(&EXT4_I(inode)->xattr_sem);
1351         if (ret < 0)
1352                 goto out;
1353
1354         pos = 0;
1355         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1356         while (pos < inline_size) {
1357                 /*
1358                  * As inlined dir doesn't store any information about '.' and
1359                  * only the inode number of '..' is stored, we have to handle
1360                  * them differently.
1361                  */
1362                 if (pos == 0) {
1363                         fake.inode = cpu_to_le32(inode->i_ino);
1364                         fake.name_len = 1;
1365                         strcpy(fake.name, ".");
1366                         fake.rec_len = ext4_rec_len_to_disk(
1367                                                 EXT4_DIR_REC_LEN(fake.name_len),
1368                                                 inline_size);
1369                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1370                         de = &fake;
1371                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1372                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1373                         fake.inode = cpu_to_le32(parent_ino);
1374                         fake.name_len = 2;
1375                         strcpy(fake.name, "..");
1376                         fake.rec_len = ext4_rec_len_to_disk(
1377                                                 EXT4_DIR_REC_LEN(fake.name_len),
1378                                                 inline_size);
1379                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1380                         de = &fake;
1381                         pos = EXT4_INLINE_DOTDOT_SIZE;
1382                 } else {
1383                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1384                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1385                         if (ext4_check_dir_entry(inode, dir_file, de,
1386                                          iloc.bh, dir_buf,
1387                                          inline_size, pos)) {
1388                                 ret = count;
1389                                 goto out;
1390                         }
1391                 }
1392
1393                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1394                 if ((hinfo->hash < start_hash) ||
1395                     ((hinfo->hash == start_hash) &&
1396                      (hinfo->minor_hash < start_minor_hash)))
1397                         continue;
1398                 if (de->inode == 0)
1399                         continue;
1400                 tmp_str.name = de->name;
1401                 tmp_str.len = de->name_len;
1402                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1403                                               hinfo->minor_hash, de, &tmp_str);
1404                 if (err) {
1405                         count = err;
1406                         goto out;
1407                 }
1408                 count++;
1409         }
1410         ret = count;
1411 out:
1412         kfree(dir_buf);
1413         brelse(iloc.bh);
1414         return ret;
1415 }
1416
1417 /*
1418  * So this function is called when the volume is mkfsed with
1419  * dir_index disabled. In order to keep f_pos persistent
1420  * after we convert from an inlined dir to a blocked based,
1421  * we just pretend that we are a normal dir and return the
1422  * offset as if '.' and '..' really take place.
1423  *
1424  */
1425 int ext4_read_inline_dir(struct file *file,
1426                          struct dir_context *ctx,
1427                          int *has_inline_data)
1428 {
1429         unsigned int offset, parent_ino;
1430         int i;
1431         struct ext4_dir_entry_2 *de;
1432         struct super_block *sb;
1433         struct inode *inode = file_inode(file);
1434         int ret, inline_size = 0;
1435         struct ext4_iloc iloc;
1436         void *dir_buf = NULL;
1437         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1438
1439         ret = ext4_get_inode_loc(inode, &iloc);
1440         if (ret)
1441                 return ret;
1442
1443         down_read(&EXT4_I(inode)->xattr_sem);
1444         if (!ext4_has_inline_data(inode)) {
1445                 up_read(&EXT4_I(inode)->xattr_sem);
1446                 *has_inline_data = 0;
1447                 goto out;
1448         }
1449
1450         inline_size = ext4_get_inline_size(inode);
1451         dir_buf = kmalloc(inline_size, GFP_NOFS);
1452         if (!dir_buf) {
1453                 ret = -ENOMEM;
1454                 up_read(&EXT4_I(inode)->xattr_sem);
1455                 goto out;
1456         }
1457
1458         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1459         up_read(&EXT4_I(inode)->xattr_sem);
1460         if (ret < 0)
1461                 goto out;
1462
1463         ret = 0;
1464         sb = inode->i_sb;
1465         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1466         offset = ctx->pos;
1467
1468         /*
1469          * dotdot_offset and dotdot_size is the real offset and
1470          * size for ".." and "." if the dir is block based while
1471          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1472          * So we will use extra_offset and extra_size to indicate them
1473          * during the inline dir iteration.
1474          */
1475         dotdot_offset = EXT4_DIR_REC_LEN(1);
1476         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1477         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1478         extra_size = extra_offset + inline_size;
1479
1480         /*
1481          * If the version has changed since the last call to
1482          * readdir(2), then we might be pointing to an invalid
1483          * dirent right now.  Scan from the start of the inline
1484          * dir to make sure.
1485          */
1486         if (file->f_version != inode->i_version) {
1487                 for (i = 0; i < extra_size && i < offset;) {
1488                         /*
1489                          * "." is with offset 0 and
1490                          * ".." is dotdot_offset.
1491                          */
1492                         if (!i) {
1493                                 i = dotdot_offset;
1494                                 continue;
1495                         } else if (i == dotdot_offset) {
1496                                 i = dotdot_size;
1497                                 continue;
1498                         }
1499                         /* for other entry, the real offset in
1500                          * the buf has to be tuned accordingly.
1501                          */
1502                         de = (struct ext4_dir_entry_2 *)
1503                                 (dir_buf + i - extra_offset);
1504                         /* It's too expensive to do a full
1505                          * dirent test each time round this
1506                          * loop, but we do have to test at
1507                          * least that it is non-zero.  A
1508                          * failure will be detected in the
1509                          * dirent test below. */
1510                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1511                                 < EXT4_DIR_REC_LEN(1))
1512                                 break;
1513                         i += ext4_rec_len_from_disk(de->rec_len,
1514                                                     extra_size);
1515                 }
1516                 offset = i;
1517                 ctx->pos = offset;
1518                 file->f_version = inode->i_version;
1519         }
1520
1521         while (ctx->pos < extra_size) {
1522                 if (ctx->pos == 0) {
1523                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1524                                 goto out;
1525                         ctx->pos = dotdot_offset;
1526                         continue;
1527                 }
1528
1529                 if (ctx->pos == dotdot_offset) {
1530                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1531                                 goto out;
1532                         ctx->pos = dotdot_size;
1533                         continue;
1534                 }
1535
1536                 de = (struct ext4_dir_entry_2 *)
1537                         (dir_buf + ctx->pos - extra_offset);
1538                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1539                                          extra_size, ctx->pos))
1540                         goto out;
1541                 if (le32_to_cpu(de->inode)) {
1542                         if (!dir_emit(ctx, de->name, de->name_len,
1543                                       le32_to_cpu(de->inode),
1544                                       get_dtype(sb, de->file_type)))
1545                                 goto out;
1546                 }
1547                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1548         }
1549 out:
1550         kfree(dir_buf);
1551         brelse(iloc.bh);
1552         return ret;
1553 }
1554
1555 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1556                                         struct ext4_dir_entry_2 **parent_de,
1557                                         int *retval)
1558 {
1559         struct ext4_iloc iloc;
1560
1561         *retval = ext4_get_inode_loc(inode, &iloc);
1562         if (*retval)
1563                 return NULL;
1564
1565         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1566
1567         return iloc.bh;
1568 }
1569
1570 /*
1571  * Try to create the inline data for the new dir.
1572  * If it succeeds, return 0, otherwise return the error.
1573  * In case of ENOSPC, the caller should create the normal disk layout dir.
1574  */
1575 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1576                                struct inode *inode)
1577 {
1578         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1579         struct ext4_iloc iloc;
1580         struct ext4_dir_entry_2 *de;
1581
1582         ret = ext4_get_inode_loc(inode, &iloc);
1583         if (ret)
1584                 return ret;
1585
1586         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1587         if (ret)
1588                 goto out;
1589
1590         /*
1591          * For inline dir, we only save the inode information for the ".."
1592          * and create a fake dentry to cover the left space.
1593          */
1594         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1595         de->inode = cpu_to_le32(parent->i_ino);
1596         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1597         de->inode = 0;
1598         de->rec_len = ext4_rec_len_to_disk(
1599                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1600                                 inline_size);
1601         set_nlink(inode, 2);
1602         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1603 out:
1604         brelse(iloc.bh);
1605         return ret;
1606 }
1607
1608 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1609                                         struct ext4_filename *fname,
1610                                         const struct qstr *d_name,
1611                                         struct ext4_dir_entry_2 **res_dir,
1612                                         int *has_inline_data)
1613 {
1614         int ret;
1615         struct ext4_iloc iloc;
1616         void *inline_start;
1617         int inline_size;
1618
1619         if (ext4_get_inode_loc(dir, &iloc))
1620                 return NULL;
1621
1622         down_read(&EXT4_I(dir)->xattr_sem);
1623         if (!ext4_has_inline_data(dir)) {
1624                 *has_inline_data = 0;
1625                 goto out;
1626         }
1627
1628         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1629                                                 EXT4_INLINE_DOTDOT_SIZE;
1630         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1631         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1632                               dir, fname, d_name, 0, res_dir);
1633         if (ret == 1)
1634                 goto out_find;
1635         if (ret < 0)
1636                 goto out;
1637
1638         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1639                 goto out;
1640
1641         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1642         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1643
1644         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1645                               dir, fname, d_name, 0, res_dir);
1646         if (ret == 1)
1647                 goto out_find;
1648
1649 out:
1650         brelse(iloc.bh);
1651         iloc.bh = NULL;
1652 out_find:
1653         up_read(&EXT4_I(dir)->xattr_sem);
1654         return iloc.bh;
1655 }
1656
1657 int ext4_delete_inline_entry(handle_t *handle,
1658                              struct inode *dir,
1659                              struct ext4_dir_entry_2 *de_del,
1660                              struct buffer_head *bh,
1661                              int *has_inline_data)
1662 {
1663         int err, inline_size;
1664         struct ext4_iloc iloc;
1665         void *inline_start;
1666
1667         err = ext4_get_inode_loc(dir, &iloc);
1668         if (err)
1669                 return err;
1670
1671         down_write(&EXT4_I(dir)->xattr_sem);
1672         if (!ext4_has_inline_data(dir)) {
1673                 *has_inline_data = 0;
1674                 goto out;
1675         }
1676
1677         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1678                 EXT4_MIN_INLINE_DATA_SIZE) {
1679                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1680                                         EXT4_INLINE_DOTDOT_SIZE;
1681                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1682                                 EXT4_INLINE_DOTDOT_SIZE;
1683         } else {
1684                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1685                 inline_size = ext4_get_inline_size(dir) -
1686                                 EXT4_MIN_INLINE_DATA_SIZE;
1687         }
1688
1689         BUFFER_TRACE(bh, "get_write_access");
1690         err = ext4_journal_get_write_access(handle, bh);
1691         if (err)
1692                 goto out;
1693
1694         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1695                                         inline_start, inline_size, 0);
1696         if (err)
1697                 goto out;
1698
1699         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1700         err = ext4_mark_inode_dirty(handle, dir);
1701         if (unlikely(err))
1702                 goto out;
1703
1704         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1705 out:
1706         up_write(&EXT4_I(dir)->xattr_sem);
1707         brelse(iloc.bh);
1708         if (err != -ENOENT)
1709                 ext4_std_error(dir->i_sb, err);
1710         return err;
1711 }
1712
1713 /*
1714  * Get the inline dentry at offset.
1715  */
1716 static inline struct ext4_dir_entry_2 *
1717 ext4_get_inline_entry(struct inode *inode,
1718                       struct ext4_iloc *iloc,
1719                       unsigned int offset,
1720                       void **inline_start,
1721                       int *inline_size)
1722 {
1723         void *inline_pos;
1724
1725         BUG_ON(offset > ext4_get_inline_size(inode));
1726
1727         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1728                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1729                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1730         } else {
1731                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1732                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1733                 *inline_size = ext4_get_inline_size(inode) -
1734                                 EXT4_MIN_INLINE_DATA_SIZE;
1735         }
1736
1737         if (inline_start)
1738                 *inline_start = inline_pos;
1739         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1740 }
1741
1742 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1743 {
1744         int err, inline_size;
1745         struct ext4_iloc iloc;
1746         void *inline_pos;
1747         unsigned int offset;
1748         struct ext4_dir_entry_2 *de;
1749         int ret = 1;
1750
1751         err = ext4_get_inode_loc(dir, &iloc);
1752         if (err) {
1753                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1754                                  err, dir->i_ino);
1755                 return 1;
1756         }
1757
1758         down_read(&EXT4_I(dir)->xattr_sem);
1759         if (!ext4_has_inline_data(dir)) {
1760                 *has_inline_data = 0;
1761                 goto out;
1762         }
1763
1764         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1765         if (!le32_to_cpu(de->inode)) {
1766                 ext4_warning(dir->i_sb,
1767                              "bad inline directory (dir #%lu) - no `..'",
1768                              dir->i_ino);
1769                 ret = 1;
1770                 goto out;
1771         }
1772
1773         offset = EXT4_INLINE_DOTDOT_SIZE;
1774         while (offset < dir->i_size) {
1775                 de = ext4_get_inline_entry(dir, &iloc, offset,
1776                                            &inline_pos, &inline_size);
1777                 if (ext4_check_dir_entry(dir, NULL, de,
1778                                          iloc.bh, inline_pos,
1779                                          inline_size, offset)) {
1780                         ext4_warning(dir->i_sb,
1781                                      "bad inline directory (dir #%lu) - "
1782                                      "inode %u, rec_len %u, name_len %d"
1783                                      "inline size %d\n",
1784                                      dir->i_ino, le32_to_cpu(de->inode),
1785                                      le16_to_cpu(de->rec_len), de->name_len,
1786                                      inline_size);
1787                         ret = 1;
1788                         goto out;
1789                 }
1790                 if (le32_to_cpu(de->inode)) {
1791                         ret = 0;
1792                         goto out;
1793                 }
1794                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1795         }
1796
1797 out:
1798         up_read(&EXT4_I(dir)->xattr_sem);
1799         brelse(iloc.bh);
1800         return ret;
1801 }
1802
1803 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1804 {
1805         int ret;
1806
1807         down_write(&EXT4_I(inode)->xattr_sem);
1808         ret = ext4_destroy_inline_data_nolock(handle, inode);
1809         up_write(&EXT4_I(inode)->xattr_sem);
1810
1811         return ret;
1812 }
1813
1814 int ext4_inline_data_fiemap(struct inode *inode,
1815                             struct fiemap_extent_info *fieinfo,
1816                             int *has_inline, __u64 start, __u64 len)
1817 {
1818         __u64 physical = 0;
1819         __u64 inline_len;
1820         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1821                 FIEMAP_EXTENT_LAST;
1822         int error = 0;
1823         struct ext4_iloc iloc;
1824
1825         down_read(&EXT4_I(inode)->xattr_sem);
1826         if (!ext4_has_inline_data(inode)) {
1827                 *has_inline = 0;
1828                 goto out;
1829         }
1830         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1831                            i_size_read(inode));
1832         if (start >= inline_len)
1833                 goto out;
1834         if (start + len < inline_len)
1835                 inline_len = start + len;
1836         inline_len -= start;
1837
1838         error = ext4_get_inode_loc(inode, &iloc);
1839         if (error)
1840                 goto out;
1841
1842         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1843         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1844         physical += offsetof(struct ext4_inode, i_block);
1845
1846         if (physical)
1847                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1848                                                 inline_len, flags);
1849         brelse(iloc.bh);
1850 out:
1851         up_read(&EXT4_I(inode)->xattr_sem);
1852         return (error < 0 ? error : 0);
1853 }
1854
1855 /*
1856  * Called during xattr set, and if we can sparse space 'needed',
1857  * just create the extent tree evict the data to the outer block.
1858  *
1859  * We use jbd2 instead of page cache to move data to the 1st block
1860  * so that the whole transaction can be committed as a whole and
1861  * the data isn't lost because of the delayed page cache write.
1862  */
1863 int ext4_try_to_evict_inline_data(handle_t *handle,
1864                                   struct inode *inode,
1865                                   int needed)
1866 {
1867         int error;
1868         struct ext4_xattr_entry *entry;
1869         struct ext4_inode *raw_inode;
1870         struct ext4_iloc iloc;
1871
1872         error = ext4_get_inode_loc(inode, &iloc);
1873         if (error)
1874                 return error;
1875
1876         raw_inode = ext4_raw_inode(&iloc);
1877         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1878                                             EXT4_I(inode)->i_inline_off);
1879         if (EXT4_XATTR_LEN(entry->e_name_len) +
1880             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1881                 error = -ENOSPC;
1882                 goto out;
1883         }
1884
1885         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1886 out:
1887         brelse(iloc.bh);
1888         return error;
1889 }
1890
1891 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1892 {
1893         handle_t *handle;
1894         int inline_size, value_len, needed_blocks;
1895         size_t i_size;
1896         void *value = NULL;
1897         struct ext4_xattr_ibody_find is = {
1898                 .s = { .not_found = -ENODATA, },
1899         };
1900         struct ext4_xattr_info i = {
1901                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1902                 .name = EXT4_XATTR_SYSTEM_DATA,
1903         };
1904
1905
1906         needed_blocks = ext4_writepage_trans_blocks(inode);
1907         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1908         if (IS_ERR(handle))
1909                 return;
1910
1911         down_write(&EXT4_I(inode)->xattr_sem);
1912         if (!ext4_has_inline_data(inode)) {
1913                 *has_inline = 0;
1914                 ext4_journal_stop(handle);
1915                 return;
1916         }
1917
1918         if (ext4_orphan_add(handle, inode))
1919                 goto out;
1920
1921         if (ext4_get_inode_loc(inode, &is.iloc))
1922                 goto out;
1923
1924         down_write(&EXT4_I(inode)->i_data_sem);
1925         i_size = inode->i_size;
1926         inline_size = ext4_get_inline_size(inode);
1927         EXT4_I(inode)->i_disksize = i_size;
1928
1929         if (i_size < inline_size) {
1930                 /* Clear the content in the xattr space. */
1931                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1932                         if (ext4_xattr_ibody_find(inode, &i, &is))
1933                                 goto out_error;
1934
1935                         BUG_ON(is.s.not_found);
1936
1937                         value_len = le32_to_cpu(is.s.here->e_value_size);
1938                         value = kmalloc(value_len, GFP_NOFS);
1939                         if (!value)
1940                                 goto out_error;
1941
1942                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1943                                                 value, value_len))
1944                                 goto out_error;
1945
1946                         i.value = value;
1947                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1948                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1949                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1950                                 goto out_error;
1951                 }
1952
1953                 /* Clear the content within i_blocks. */
1954                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1955                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1956                         memset(p + i_size, 0,
1957                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1958                 }
1959
1960                 EXT4_I(inode)->i_inline_size = i_size <
1961                                         EXT4_MIN_INLINE_DATA_SIZE ?
1962                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1963         }
1964
1965 out_error:
1966         up_write(&EXT4_I(inode)->i_data_sem);
1967 out:
1968         brelse(is.iloc.bh);
1969         up_write(&EXT4_I(inode)->xattr_sem);
1970         kfree(value);
1971         if (inode->i_nlink)
1972                 ext4_orphan_del(handle, inode);
1973
1974         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1975         ext4_mark_inode_dirty(handle, inode);
1976         if (IS_SYNC(inode))
1977                 ext4_handle_sync(handle);
1978
1979         ext4_journal_stop(handle);
1980         return;
1981 }
1982
1983 int ext4_convert_inline_data(struct inode *inode)
1984 {
1985         int error, needed_blocks;
1986         handle_t *handle;
1987         struct ext4_iloc iloc;
1988
1989         if (!ext4_has_inline_data(inode)) {
1990                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1991                 return 0;
1992         }
1993
1994         needed_blocks = ext4_writepage_trans_blocks(inode);
1995
1996         iloc.bh = NULL;
1997         error = ext4_get_inode_loc(inode, &iloc);
1998         if (error)
1999                 return error;
2000
2001         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2002         if (IS_ERR(handle)) {
2003                 error = PTR_ERR(handle);
2004                 goto out_free;
2005         }
2006
2007         down_write(&EXT4_I(inode)->xattr_sem);
2008         if (!ext4_has_inline_data(inode)) {
2009                 up_write(&EXT4_I(inode)->xattr_sem);
2010                 goto out;
2011         }
2012
2013         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2014         up_write(&EXT4_I(inode)->xattr_sem);
2015 out:
2016         ext4_journal_stop(handle);
2017 out_free:
2018         brelse(iloc.bh);
2019         return error;
2020 }