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_INCOMPAT_FEATURE(inode->i_sb,
 438                                       EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 439                 if (S_ISDIR(inode->i_mode) ||
 440                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 441                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 442                         ext4_ext_tree_init(handle, inode);
 443                 }
 444         }
 445         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 446
 447         get_bh(is.iloc.bh);
 448         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 449
 450         EXT4_I(inode)->i_inline_off = 0;
 451         EXT4_I(inode)->i_inline_size = 0;
 452         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 453 out:
 454         brelse(is.iloc.bh);
 455         if (error == -ENODATA)
 456                 error = 0;
 457         return error;
 458 }
 459
 460 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 461 {
 462         void *kaddr;
 463         int ret = 0;
 464         size_t len;
 465         struct ext4_iloc iloc;
 466
 467         BUG_ON(!PageLocked(page));
 468         BUG_ON(!ext4_has_inline_data(inode));
 469         BUG_ON(page->index);
 470
 471         if (!EXT4_I(inode)->i_inline_off) {
 472                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 473                              inode->i_ino);
 474                 goto out;
 475         }
 476
 477         ret = ext4_get_inode_loc(inode, &iloc);
 478         if (ret)
 479                 goto out;
 480
 481         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 482         kaddr = kmap_atomic(page);
 483         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 484         flush_dcache_page(page);
 485         kunmap_atomic(kaddr);
 486         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 487         SetPageUptodate(page);
 488         brelse(iloc.bh);
 489
 490 out:
 491         return ret;
 492 }
 493
 494 int ext4_readpage_inline(struct inode *inode, struct page *page)
 495 {
 496         int ret = 0;
 497
 498         down_read(&EXT4_I(inode)->xattr_sem);
 499         if (!ext4_has_inline_data(inode)) {
 500                 up_read(&EXT4_I(inode)->xattr_sem);
 501                 return -EAGAIN;
 502         }
 503
 504         /*
 505          * Current inline data can only exist in the 1st page,
 506          * So for all the other pages, just set them uptodate.
 507          */
 508         if (!page->index)
 509                 ret = ext4_read_inline_page(inode, page);
 510         else if (!PageUptodate(page)) {
 511                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 512                 SetPageUptodate(page);
 513         }
 514
 515         up_read(&EXT4_I(inode)->xattr_sem);
 516
 517         unlock_page(page);
 518         return ret >= 0 ? 0 : ret;
 519 }
 520
 521 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 522                                               struct inode *inode,
 523                                               unsigned flags)
 524 {
 525         int ret, needed_blocks;
 526         handle_t *handle = NULL;
 527         int retries = 0, sem_held = 0;
 528         struct page *page = NULL;
 529         unsigned from, to;
 530         struct ext4_iloc iloc;
 531
 532         if (!ext4_has_inline_data(inode)) {
 533                 /*
 534                  * clear the flag so that no new write
 535                  * will trap here again.
 536                  */
 537                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 538                 return 0;
 539         }
 540
 541         needed_blocks = ext4_writepage_trans_blocks(inode);
 542
 543         ret = ext4_get_inode_loc(inode, &iloc);
 544         if (ret)
 545                 return ret;
 546
 547 retry:
 548         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 549         if (IS_ERR(handle)) {
 550                 ret = PTR_ERR(handle);
 551                 handle = NULL;
 552                 goto out;
 553         }
 554
 555         /* We cannot recurse into the filesystem as the transaction is already
 556          * started */
 557         flags |= AOP_FLAG_NOFS;
 558
 559         page = grab_cache_page_write_begin(mapping, 0, flags);
 560         if (!page) {
 561                 ret = -ENOMEM;
 562                 goto out;
 563         }
 564
 565         down_write(&EXT4_I(inode)->xattr_sem);
 566         sem_held = 1;
 567         /* If some one has already done this for us, just exit. */
 568         if (!ext4_has_inline_data(inode)) {
 569                 ret = 0;
 570                 goto out;
 571         }
 572
 573         from = 0;
 574         to = ext4_get_inline_size(inode);
 575         if (!PageUptodate(page)) {
 576                 ret = ext4_read_inline_page(inode, page);
 577                 if (ret < 0)
 578                         goto out;
 579         }
 580
 581         ret = ext4_destroy_inline_data_nolock(handle, inode);
 582         if (ret)
 583                 goto out;
 584
 585         if (ext4_should_dioread_nolock(inode))
 586                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 587         else
 588                 ret = __block_write_begin(page, from, to, ext4_get_block);
 589
 590         if (!ret && ext4_should_journal_data(inode)) {
 591                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 592                                              from, to, NULL,
 593                                              do_journal_get_write_access);
 594         }
 595
 596         if (ret) {
 597                 unlock_page(page);
 598                 page_cache_release(page);
 599                 page = NULL;
 600                 ext4_orphan_add(handle, inode);
 601                 up_write(&EXT4_I(inode)->xattr_sem);
 602                 sem_held = 0;
 603                 ext4_journal_stop(handle);
 604                 handle = NULL;
 605                 ext4_truncate_failed_write(inode);
 606                 /*
 607                  * If truncate failed early the inode might
 608                  * still be on the orphan list; we need to
 609                  * make sure the inode is removed from the
 610                  * orphan list in that case.
 611                  */
 612                 if (inode->i_nlink)
 613                         ext4_orphan_del(NULL, inode);
 614         }
 615
 616         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 617                 goto retry;
 618
 619         if (page)
 620                 block_commit_write(page, from, to);
 621 out:
 622         if (page) {
 623                 unlock_page(page);
 624                 page_cache_release(page);
 625         }
 626         if (sem_held)
 627                 up_write(&EXT4_I(inode)->xattr_sem);
 628         if (handle)
 629                 ext4_journal_stop(handle);
 630         brelse(iloc.bh);
 631         return ret;
 632 }
 633
 634 /*
 635  * Try to write data in the inode.
 636  * If the inode has inline data, check whether the new write can be
 637  * in the inode also. If not, create the page the handle, move the data
 638  * to the page make it update and let the later codes create extent for it.
 639  */
 640 int ext4_try_to_write_inline_data(struct address_space *mapping,
 641                                   struct inode *inode,
 642                                   loff_t pos, unsigned len,
 643                                   unsigned flags,
 644                                   struct page **pagep)
 645 {
 646         int ret;
 647         handle_t *handle;
 648         struct page *page;
 649         struct ext4_iloc iloc;
 650
 651         if (pos + len > ext4_get_max_inline_size(inode))
 652                 goto convert;
 653
 654         ret = ext4_get_inode_loc(inode, &iloc);
 655         if (ret)
 656                 return ret;
 657
 658         /*
 659          * The possible write could happen in the inode,
 660          * so try to reserve the space in inode first.
 661          */
 662         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 663         if (IS_ERR(handle)) {
 664                 ret = PTR_ERR(handle);
 665                 handle = NULL;
 666                 goto out;
 667         }
 668
 669         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 670         if (ret && ret != -ENOSPC)
 671                 goto out;
 672
 673         /* We don't have space in inline inode, so convert it to extent. */
 674         if (ret == -ENOSPC) {
 675                 ext4_journal_stop(handle);
 676                 brelse(iloc.bh);
 677                 goto convert;
 678         }
 679
 680         flags |= AOP_FLAG_NOFS;
 681
 682         page = grab_cache_page_write_begin(mapping, 0, flags);
 683         if (!page) {
 684                 ret = -ENOMEM;
 685                 goto out;
 686         }
 687
 688         *pagep = page;
 689         down_read(&EXT4_I(inode)->xattr_sem);
 690         if (!ext4_has_inline_data(inode)) {
 691                 ret = 0;
 692                 unlock_page(page);
 693                 page_cache_release(page);
 694                 goto out_up_read;
 695         }
 696
 697         if (!PageUptodate(page)) {
 698                 ret = ext4_read_inline_page(inode, page);
 699                 if (ret < 0)
 700                         goto out_up_read;
 701         }
 702
 703         ret = 1;
 704         handle = NULL;
 705 out_up_read:
 706         up_read(&EXT4_I(inode)->xattr_sem);
 707 out:
 708         if (handle)
 709                 ext4_journal_stop(handle);
 710         brelse(iloc.bh);
 711         return ret;
 712 convert:
 713         return ext4_convert_inline_data_to_extent(mapping,
 714                                                   inode, flags);
 715 }
 716
 717 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 718                                unsigned copied, struct page *page)
 719 {
 720         int ret;
 721         void *kaddr;
 722         struct ext4_iloc iloc;
 723
 724         if (unlikely(copied < len)) {
 725                 if (!PageUptodate(page)) {
 726                         copied = 0;
 727                         goto out;
 728                 }
 729         }
 730
 731         ret = ext4_get_inode_loc(inode, &iloc);
 732         if (ret) {
 733                 ext4_std_error(inode->i_sb, ret);
 734                 copied = 0;
 735                 goto out;
 736         }
 737
 738         down_write(&EXT4_I(inode)->xattr_sem);
 739         BUG_ON(!ext4_has_inline_data(inode));
 740
 741         kaddr = kmap_atomic(page);
 742         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 743         kunmap_atomic(kaddr);
 744         SetPageUptodate(page);
 745         /* clear page dirty so that writepages wouldn't work for us. */
 746         ClearPageDirty(page);
 747
 748         up_write(&EXT4_I(inode)->xattr_sem);
 749         brelse(iloc.bh);
 750 out:
 751         return copied;
 752 }
 753
 754 struct buffer_head *
 755 ext4_journalled_write_inline_data(struct inode *inode,
 756                                   unsigned len,
 757                                   struct page *page)
 758 {
 759         int ret;
 760         void *kaddr;
 761         struct ext4_iloc iloc;
 762
 763         ret = ext4_get_inode_loc(inode, &iloc);
 764         if (ret) {
 765                 ext4_std_error(inode->i_sb, ret);
 766                 return NULL;
 767         }
 768
 769         down_write(&EXT4_I(inode)->xattr_sem);
 770         kaddr = kmap_atomic(page);
 771         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 772         kunmap_atomic(kaddr);
 773         up_write(&EXT4_I(inode)->xattr_sem);
 774
 775         return iloc.bh;
 776 }
 777
 778 /*
 779  * Try to make the page cache and handle ready for the inline data case.
 780  * We can call this function in 2 cases:
 781  * 1. The inode is created and the first write exceeds inline size. We can
 782  *    clear the inode state safely.
 783  * 2. The inode has inline data, then we need to read the data, make it
 784  *    update and dirty so that ext4_da_writepages can handle it. We don't
 785  *    need to start the journal since the file's metatdata isn't changed now.
 786  */
 787 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 788                                                  struct inode *inode,
 789                                                  unsigned flags,
 790                                                  void **fsdata)
 791 {
 792         int ret = 0, inline_size;
 793         struct page *page;
 794
 795         page = grab_cache_page_write_begin(mapping, 0, flags);
 796         if (!page)
 797                 return -ENOMEM;
 798
 799         down_read(&EXT4_I(inode)->xattr_sem);
 800         if (!ext4_has_inline_data(inode)) {
 801                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 802                 goto out;
 803         }
 804
 805         inline_size = ext4_get_inline_size(inode);
 806
 807         if (!PageUptodate(page)) {
 808                 ret = ext4_read_inline_page(inode, page);
 809                 if (ret < 0)
 810                         goto out;
 811         }
 812
 813         ret = __block_write_begin(page, 0, inline_size,
 814                                   ext4_da_get_block_prep);
 815         if (ret) {
 816                 up_read(&EXT4_I(inode)->xattr_sem);
 817                 unlock_page(page);
 818                 page_cache_release(page);
 819                 ext4_truncate_failed_write(inode);
 820                 return ret;
 821         }
 822
 823         SetPageDirty(page);
 824         SetPageUptodate(page);
 825         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 826         *fsdata = (void *)CONVERT_INLINE_DATA;
 827
 828 out:
 829         up_read(&EXT4_I(inode)->xattr_sem);
 830         if (page) {
 831                 unlock_page(page);
 832                 page_cache_release(page);
 833         }
 834         return ret;
 835 }
 836
 837 /*
 838  * Prepare the write for the inline data.
 839  * If the the data can be written into the inode, we just read
 840  * the page and make it uptodate, and start the journal.
 841  * Otherwise read the page, makes it dirty so that it can be
 842  * handle in writepages(the i_disksize update is left to the
 843  * normal ext4_da_write_end).
 844  */
 845 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 846                                     struct inode *inode,
 847                                     loff_t pos, unsigned len,
 848                                     unsigned flags,
 849                                     struct page **pagep,
 850                                     void **fsdata)
 851 {
 852         int ret, inline_size;
 853         handle_t *handle;
 854         struct page *page;
 855         struct ext4_iloc iloc;
 856         int retries;
 857
 858         ret = ext4_get_inode_loc(inode, &iloc);
 859         if (ret)
 860                 return ret;
 861
 862 retry_journal:
 863         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 864         if (IS_ERR(handle)) {
 865                 ret = PTR_ERR(handle);
 866                 goto out;
 867         }
 868
 869         inline_size = ext4_get_max_inline_size(inode);
 870
 871         ret = -ENOSPC;
 872         if (inline_size >= pos + len) {
 873                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 874                 if (ret && ret != -ENOSPC)
 875                         goto out_journal;
 876         }
 877
 878         /*
 879          * We cannot recurse into the filesystem as the transaction
 880          * is already started.
 881          */
 882         flags |= AOP_FLAG_NOFS;
 883
 884         if (ret == -ENOSPC) {
 885                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 886                                                             inode,
 887                                                             flags,
 888                                                             fsdata);
 889                 ext4_journal_stop(handle);
 890                 if (ret == -ENOSPC &&
 891                     ext4_should_retry_alloc(inode->i_sb, &retries))
 892                         goto retry_journal;
 893                 goto out;
 894         }
 895
 896
 897         page = grab_cache_page_write_begin(mapping, 0, flags);
 898         if (!page) {
 899                 ret = -ENOMEM;
 900                 goto out_journal;
 901         }
 902
 903         down_read(&EXT4_I(inode)->xattr_sem);
 904         if (!ext4_has_inline_data(inode)) {
 905                 ret = 0;
 906                 goto out_release_page;
 907         }
 908
 909         if (!PageUptodate(page)) {
 910                 ret = ext4_read_inline_page(inode, page);
 911                 if (ret < 0)
 912                         goto out_release_page;
 913         }
 914
 915         up_read(&EXT4_I(inode)->xattr_sem);
 916         *pagep = page;
 917         brelse(iloc.bh);
 918         return 1;
 919 out_release_page:
 920         up_read(&EXT4_I(inode)->xattr_sem);
 921         unlock_page(page);
 922         page_cache_release(page);
 923 out_journal:
 924         ext4_journal_stop(handle);
 925 out:
 926         brelse(iloc.bh);
 927         return ret;
 928 }
 929
 930 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 931                                   unsigned len, unsigned copied,
 932                                   struct page *page)
 933 {
 934         int i_size_changed = 0;
 935
 936         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 937
 938         /*
 939          * No need to use i_size_read() here, the i_size
 940          * cannot change under us because we hold i_mutex.
 941          *
 942          * But it's important to update i_size while still holding page lock:
 943          * page writeout could otherwise come in and zero beyond i_size.
 944          */
 945         if (pos+copied > inode->i_size) {
 946                 i_size_write(inode, pos+copied);
 947                 i_size_changed = 1;
 948         }
 949         unlock_page(page);
 950         page_cache_release(page);
 951
 952         /*
 953          * Don't mark the inode dirty under page lock. First, it unnecessarily
 954          * makes the holding time of page lock longer. Second, it forces lock
 955          * ordering of page lock and transaction start for journaling
 956          * filesystems.
 957          */
 958         if (i_size_changed)
 959                 mark_inode_dirty(inode);
 960
 961         return copied;
 962 }
 963
 964 #ifdef INLINE_DIR_DEBUG
 965 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 966                           void *inline_start, int inline_size)
 967 {
 968         int offset;
 969         unsigned short de_len;
 970         struct ext4_dir_entry_2 *de = inline_start;
 971         void *dlimit = inline_start + inline_size;
 972
 973         trace_printk("inode %lu\n", dir->i_ino);
 974         offset = 0;
 975         while ((void *)de < dlimit) {
 976                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 977                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 978                              offset, de_len, de->name_len, de->name,
 979                              de->name_len, le32_to_cpu(de->inode));
 980                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 981                                          inline_start, inline_size, offset))
 982                         BUG();
 983
 984                 offset += de_len;
 985                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 986         }
 987 }
 988 #else
 989 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 990 #endif
 991
 992 /*
 993  * Add a new entry into a inline dir.
 994  * It will return -ENOSPC if no space is available, and -EIO
 995  * and -EEXIST if directory entry already exists.
 996  */
 997 static int ext4_add_dirent_to_inline(handle_t *handle,
 998                                      struct dentry *dentry,
 999                                      struct inode *inode,
1000                                      struct ext4_iloc *iloc,
1001                                      void *inline_start, int inline_size)
1002 {
1003         struct inode    *dir = d_inode(dentry->d_parent);
1004         const char      *name = dentry->d_name.name;
1005         int             namelen = dentry->d_name.len;
1006         int             err;
1007         struct ext4_dir_entry_2 *de;
1008
1009         err = ext4_find_dest_de(dir, inode, iloc->bh,
1010                                 inline_start, inline_size,
1011                                 name, namelen, &de);
1012         if (err)
1013                 return err;
1014
1015         BUFFER_TRACE(iloc->bh, "get_write_access");
1016         err = ext4_journal_get_write_access(handle, iloc->bh);
1017         if (err)
1018                 return err;
1019         ext4_insert_dentry(dir, inode, de, inline_size, &dentry->d_name,
1020                            name, namelen);
1021
1022         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1023
1024         /*
1025          * XXX shouldn't update any times until successful
1026          * completion of syscall, but too many callers depend
1027          * on this.
1028          *
1029          * XXX similarly, too many callers depend on
1030          * ext4_new_inode() setting the times, but error
1031          * recovery deletes the inode, so the worst that can
1032          * happen is that the times are slightly out of date
1033          * and/or different from the directory change time.
1034          */
1035         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1036         ext4_update_dx_flag(dir);
1037         dir->i_version++;
1038         ext4_mark_inode_dirty(handle, dir);
1039         return 1;
1040 }
1041
1042 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1043                                        struct ext4_iloc *iloc)
1044 {
1045         struct ext4_xattr_entry *entry;
1046         struct ext4_xattr_ibody_header *header;
1047
1048         BUG_ON(!EXT4_I(inode)->i_inline_off);
1049
1050         header = IHDR(inode, ext4_raw_inode(iloc));
1051         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1052                                             EXT4_I(inode)->i_inline_off);
1053
1054         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1055 }
1056
1057 /* Set the final de to cover the whole block. */
1058 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1059 {
1060         struct ext4_dir_entry_2 *de, *prev_de;
1061         void *limit;
1062         int de_len;
1063
1064         de = (struct ext4_dir_entry_2 *)de_buf;
1065         if (old_size) {
1066                 limit = de_buf + old_size;
1067                 do {
1068                         prev_de = de;
1069                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1070                         de_buf += de_len;
1071                         de = (struct ext4_dir_entry_2 *)de_buf;
1072                 } while (de_buf < limit);
1073
1074                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1075                                                         old_size, new_size);
1076         } else {
1077                 /* this is just created, so create an empty entry. */
1078                 de->inode = 0;
1079                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1080         }
1081 }
1082
1083 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1084                                   struct ext4_iloc *iloc)
1085 {
1086         int ret;
1087         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1088         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1089
1090         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1091                 return -ENOSPC;
1092
1093         ret = ext4_update_inline_data(handle, dir,
1094                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1095         if (ret)
1096                 return ret;
1097
1098         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1099                              EXT4_I(dir)->i_inline_size -
1100                                                 EXT4_MIN_INLINE_DATA_SIZE);
1101         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1102         return 0;
1103 }
1104
1105 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1106                                      struct ext4_iloc *iloc,
1107                                      void *buf, int inline_size)
1108 {
1109         ext4_create_inline_data(handle, inode, inline_size);
1110         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1111         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1112 }
1113
1114 static int ext4_finish_convert_inline_dir(handle_t *handle,
1115                                           struct inode *inode,
1116                                           struct buffer_head *dir_block,
1117                                           void *buf,
1118                                           int inline_size)
1119 {
1120         int err, csum_size = 0, header_size = 0;
1121         struct ext4_dir_entry_2 *de;
1122         struct ext4_dir_entry_tail *t;
1123         void *target = dir_block->b_data;
1124
1125         /*
1126          * First create "." and ".." and then copy the dir information
1127          * back to the block.
1128          */
1129         de = (struct ext4_dir_entry_2 *)target;
1130         de = ext4_init_dot_dotdot(inode, de,
1131                 inode->i_sb->s_blocksize, csum_size,
1132                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1133         header_size = (void *)de - target;
1134
1135         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1136                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1137
1138         if (ext4_has_metadata_csum(inode->i_sb))
1139                 csum_size = sizeof(struct ext4_dir_entry_tail);
1140
1141         inode->i_size = inode->i_sb->s_blocksize;
1142         i_size_write(inode, inode->i_sb->s_blocksize);
1143         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1144         ext4_update_final_de(dir_block->b_data,
1145                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1146                         inode->i_sb->s_blocksize - csum_size);
1147
1148         if (csum_size) {
1149                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1150                                      inode->i_sb->s_blocksize);
1151                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1152         }
1153         set_buffer_uptodate(dir_block);
1154         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1155         if (err)
1156                 goto out;
1157         set_buffer_verified(dir_block);
1158 out:
1159         return err;
1160 }
1161
1162 static int ext4_convert_inline_data_nolock(handle_t *handle,
1163                                            struct inode *inode,
1164                                            struct ext4_iloc *iloc)
1165 {
1166         int error;
1167         void *buf = NULL;
1168         struct buffer_head *data_bh = NULL;
1169         struct ext4_map_blocks map;
1170         int inline_size;
1171
1172         inline_size = ext4_get_inline_size(inode);
1173         buf = kmalloc(inline_size, GFP_NOFS);
1174         if (!buf) {
1175                 error = -ENOMEM;
1176                 goto out;
1177         }
1178
1179         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1180         if (error < 0)
1181                 goto out;
1182
1183         /*
1184          * Make sure the inline directory entries pass checks before we try to
1185          * convert them, so that we avoid touching stuff that needs fsck.
1186          */
1187         if (S_ISDIR(inode->i_mode)) {
1188                 error = ext4_check_all_de(inode, iloc->bh,
1189                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1190                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1191                 if (error)
1192                         goto out;
1193         }
1194
1195         error = ext4_destroy_inline_data_nolock(handle, inode);
1196         if (error)
1197                 goto out;
1198
1199         map.m_lblk = 0;
1200         map.m_len = 1;
1201         map.m_flags = 0;
1202         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1203         if (error < 0)
1204                 goto out_restore;
1205         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1206                 error = -EIO;
1207                 goto out_restore;
1208         }
1209
1210         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1211         if (!data_bh) {
1212                 error = -ENOMEM;
1213                 goto out_restore;
1214         }
1215
1216         lock_buffer(data_bh);
1217         error = ext4_journal_get_create_access(handle, data_bh);
1218         if (error) {
1219                 unlock_buffer(data_bh);
1220                 error = -EIO;
1221                 goto out_restore;
1222         }
1223         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1224
1225         if (!S_ISDIR(inode->i_mode)) {
1226                 memcpy(data_bh->b_data, buf, inline_size);
1227                 set_buffer_uptodate(data_bh);
1228                 error = ext4_handle_dirty_metadata(handle,
1229                                                    inode, data_bh);
1230         } else {
1231                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1232                                                        buf, inline_size);
1233         }
1234
1235         unlock_buffer(data_bh);
1236 out_restore:
1237         if (error)
1238                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1239
1240 out:
1241         brelse(data_bh);
1242         kfree(buf);
1243         return error;
1244 }
1245
1246 /*
1247  * Try to add the new entry to the inline data.
1248  * If succeeds, return 0. If not, extended the inline dir and copied data to
1249  * the new created block.
1250  */
1251 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1252                               struct inode *inode)
1253 {
1254         int ret, inline_size;
1255         void *inline_start;
1256         struct ext4_iloc iloc;
1257         struct inode *dir = d_inode(dentry->d_parent);
1258
1259         ret = ext4_get_inode_loc(dir, &iloc);
1260         if (ret)
1261                 return ret;
1262
1263         down_write(&EXT4_I(dir)->xattr_sem);
1264         if (!ext4_has_inline_data(dir))
1265                 goto out;
1266
1267         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1268                                                  EXT4_INLINE_DOTDOT_SIZE;
1269         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1270
1271         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1272                                         inline_start, inline_size);
1273         if (ret != -ENOSPC)
1274                 goto out;
1275
1276         /* check whether it can be inserted to inline xattr space. */
1277         inline_size = EXT4_I(dir)->i_inline_size -
1278                         EXT4_MIN_INLINE_DATA_SIZE;
1279         if (!inline_size) {
1280                 /* Try to use the xattr space.*/
1281                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1282                 if (ret && ret != -ENOSPC)
1283                         goto out;
1284
1285                 inline_size = EXT4_I(dir)->i_inline_size -
1286                                 EXT4_MIN_INLINE_DATA_SIZE;
1287         }
1288
1289         if (inline_size) {
1290                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1291
1292                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1293                                                 inline_start, inline_size);
1294
1295                 if (ret != -ENOSPC)
1296                         goto out;
1297         }
1298
1299         /*
1300          * The inline space is filled up, so create a new block for it.
1301          * As the extent tree will be created, we have to save the inline
1302          * dir first.
1303          */
1304         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1305
1306 out:
1307         ext4_mark_inode_dirty(handle, dir);
1308         up_write(&EXT4_I(dir)->xattr_sem);
1309         brelse(iloc.bh);
1310         return ret;
1311 }
1312
1313 /*
1314  * This function fills a red-black tree with information from an
1315  * inlined dir.  It returns the number directory entries loaded
1316  * into the tree.  If there is an error it is returned in err.
1317  */
1318 int htree_inlinedir_to_tree(struct file *dir_file,
1319                             struct inode *dir, ext4_lblk_t block,
1320                             struct dx_hash_info *hinfo,
1321                             __u32 start_hash, __u32 start_minor_hash,
1322                             int *has_inline_data)
1323 {
1324         int err = 0, count = 0;
1325         unsigned int parent_ino;
1326         int pos;
1327         struct ext4_dir_entry_2 *de;
1328         struct inode *inode = file_inode(dir_file);
1329         int ret, inline_size = 0;
1330         struct ext4_iloc iloc;
1331         void *dir_buf = NULL;
1332         struct ext4_dir_entry_2 fake;
1333         struct ext4_str tmp_str;
1334
1335         ret = ext4_get_inode_loc(inode, &iloc);
1336         if (ret)
1337                 return ret;
1338
1339         down_read(&EXT4_I(inode)->xattr_sem);
1340         if (!ext4_has_inline_data(inode)) {
1341                 up_read(&EXT4_I(inode)->xattr_sem);
1342                 *has_inline_data = 0;
1343                 goto out;
1344         }
1345
1346         inline_size = ext4_get_inline_size(inode);
1347         dir_buf = kmalloc(inline_size, GFP_NOFS);
1348         if (!dir_buf) {
1349                 ret = -ENOMEM;
1350                 up_read(&EXT4_I(inode)->xattr_sem);
1351                 goto out;
1352         }
1353
1354         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1355         up_read(&EXT4_I(inode)->xattr_sem);
1356         if (ret < 0)
1357                 goto out;
1358
1359         pos = 0;
1360         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1361         while (pos < inline_size) {
1362                 /*
1363                  * As inlined dir doesn't store any information about '.' and
1364                  * only the inode number of '..' is stored, we have to handle
1365                  * them differently.
1366                  */
1367                 if (pos == 0) {
1368                         fake.inode = cpu_to_le32(inode->i_ino);
1369                         fake.name_len = 1;
1370                         strcpy(fake.name, ".");
1371                         fake.rec_len = ext4_rec_len_to_disk(
1372                                                 EXT4_DIR_REC_LEN(fake.name_len),
1373                                                 inline_size);
1374                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1375                         de = &fake;
1376                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1377                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1378                         fake.inode = cpu_to_le32(parent_ino);
1379                         fake.name_len = 2;
1380                         strcpy(fake.name, "..");
1381                         fake.rec_len = ext4_rec_len_to_disk(
1382                                                 EXT4_DIR_REC_LEN(fake.name_len),
1383                                                 inline_size);
1384                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1385                         de = &fake;
1386                         pos = EXT4_INLINE_DOTDOT_SIZE;
1387                 } else {
1388                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1389                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1390                         if (ext4_check_dir_entry(inode, dir_file, de,
1391                                          iloc.bh, dir_buf,
1392                                          inline_size, pos)) {
1393                                 ret = count;
1394                                 goto out;
1395                         }
1396                 }
1397
1398                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1399                 if ((hinfo->hash < start_hash) ||
1400                     ((hinfo->hash == start_hash) &&
1401                      (hinfo->minor_hash < start_minor_hash)))
1402                         continue;
1403                 if (de->inode == 0)
1404                         continue;
1405                 tmp_str.name = de->name;
1406                 tmp_str.len = de->name_len;
1407                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1408                                               hinfo->minor_hash, de, &tmp_str);
1409                 if (err) {
1410                         count = err;
1411                         goto out;
1412                 }
1413                 count++;
1414         }
1415         ret = count;
1416 out:
1417         kfree(dir_buf);
1418         brelse(iloc.bh);
1419         return ret;
1420 }
1421
1422 /*
1423  * So this function is called when the volume is mkfsed with
1424  * dir_index disabled. In order to keep f_pos persistent
1425  * after we convert from an inlined dir to a blocked based,
1426  * we just pretend that we are a normal dir and return the
1427  * offset as if '.' and '..' really take place.
1428  *
1429  */
1430 int ext4_read_inline_dir(struct file *file,
1431                          struct dir_context *ctx,
1432                          int *has_inline_data)
1433 {
1434         unsigned int offset, parent_ino;
1435         int i;
1436         struct ext4_dir_entry_2 *de;
1437         struct super_block *sb;
1438         struct inode *inode = file_inode(file);
1439         int ret, inline_size = 0;
1440         struct ext4_iloc iloc;
1441         void *dir_buf = NULL;
1442         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1443
1444         ret = ext4_get_inode_loc(inode, &iloc);
1445         if (ret)
1446                 return ret;
1447
1448         down_read(&EXT4_I(inode)->xattr_sem);
1449         if (!ext4_has_inline_data(inode)) {
1450                 up_read(&EXT4_I(inode)->xattr_sem);
1451                 *has_inline_data = 0;
1452                 goto out;
1453         }
1454
1455         inline_size = ext4_get_inline_size(inode);
1456         dir_buf = kmalloc(inline_size, GFP_NOFS);
1457         if (!dir_buf) {
1458                 ret = -ENOMEM;
1459                 up_read(&EXT4_I(inode)->xattr_sem);
1460                 goto out;
1461         }
1462
1463         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1464         up_read(&EXT4_I(inode)->xattr_sem);
1465         if (ret < 0)
1466                 goto out;
1467
1468         ret = 0;
1469         sb = inode->i_sb;
1470         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1471         offset = ctx->pos;
1472
1473         /*
1474          * dotdot_offset and dotdot_size is the real offset and
1475          * size for ".." and "." if the dir is block based while
1476          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1477          * So we will use extra_offset and extra_size to indicate them
1478          * during the inline dir iteration.
1479          */
1480         dotdot_offset = EXT4_DIR_REC_LEN(1);
1481         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1482         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1483         extra_size = extra_offset + inline_size;
1484
1485         /*
1486          * If the version has changed since the last call to
1487          * readdir(2), then we might be pointing to an invalid
1488          * dirent right now.  Scan from the start of the inline
1489          * dir to make sure.
1490          */
1491         if (file->f_version != inode->i_version) {
1492                 for (i = 0; i < extra_size && i < offset;) {
1493                         /*
1494                          * "." is with offset 0 and
1495                          * ".." is dotdot_offset.
1496                          */
1497                         if (!i) {
1498                                 i = dotdot_offset;
1499                                 continue;
1500                         } else if (i == dotdot_offset) {
1501                                 i = dotdot_size;
1502                                 continue;
1503                         }
1504                         /* for other entry, the real offset in
1505                          * the buf has to be tuned accordingly.
1506                          */
1507                         de = (struct ext4_dir_entry_2 *)
1508                                 (dir_buf + i - extra_offset);
1509                         /* It's too expensive to do a full
1510                          * dirent test each time round this
1511                          * loop, but we do have to test at
1512                          * least that it is non-zero.  A
1513                          * failure will be detected in the
1514                          * dirent test below. */
1515                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1516                                 < EXT4_DIR_REC_LEN(1))
1517                                 break;
1518                         i += ext4_rec_len_from_disk(de->rec_len,
1519                                                     extra_size);
1520                 }
1521                 offset = i;
1522                 ctx->pos = offset;
1523                 file->f_version = inode->i_version;
1524         }
1525
1526         while (ctx->pos < extra_size) {
1527                 if (ctx->pos == 0) {
1528                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1529                                 goto out;
1530                         ctx->pos = dotdot_offset;
1531                         continue;
1532                 }
1533
1534                 if (ctx->pos == dotdot_offset) {
1535                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1536                                 goto out;
1537                         ctx->pos = dotdot_size;
1538                         continue;
1539                 }
1540
1541                 de = (struct ext4_dir_entry_2 *)
1542                         (dir_buf + ctx->pos - extra_offset);
1543                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1544                                          extra_size, ctx->pos))
1545                         goto out;
1546                 if (le32_to_cpu(de->inode)) {
1547                         if (!dir_emit(ctx, de->name, de->name_len,
1548                                       le32_to_cpu(de->inode),
1549                                       get_dtype(sb, de->file_type)))
1550                                 goto out;
1551                 }
1552                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1553         }
1554 out:
1555         kfree(dir_buf);
1556         brelse(iloc.bh);
1557         return ret;
1558 }
1559
1560 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1561                                         struct ext4_dir_entry_2 **parent_de,
1562                                         int *retval)
1563 {
1564         struct ext4_iloc iloc;
1565
1566         *retval = ext4_get_inode_loc(inode, &iloc);
1567         if (*retval)
1568                 return NULL;
1569
1570         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1571
1572         return iloc.bh;
1573 }
1574
1575 /*
1576  * Try to create the inline data for the new dir.
1577  * If it succeeds, return 0, otherwise return the error.
1578  * In case of ENOSPC, the caller should create the normal disk layout dir.
1579  */
1580 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1581                                struct inode *inode)
1582 {
1583         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1584         struct ext4_iloc iloc;
1585         struct ext4_dir_entry_2 *de;
1586
1587         ret = ext4_get_inode_loc(inode, &iloc);
1588         if (ret)
1589                 return ret;
1590
1591         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1592         if (ret)
1593                 goto out;
1594
1595         /*
1596          * For inline dir, we only save the inode information for the ".."
1597          * and create a fake dentry to cover the left space.
1598          */
1599         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1600         de->inode = cpu_to_le32(parent->i_ino);
1601         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1602         de->inode = 0;
1603         de->rec_len = ext4_rec_len_to_disk(
1604                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1605                                 inline_size);
1606         set_nlink(inode, 2);
1607         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1608 out:
1609         brelse(iloc.bh);
1610         return ret;
1611 }
1612
1613 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1614                                         const struct qstr *d_name,
1615                                         struct ext4_dir_entry_2 **res_dir,
1616                                         int *has_inline_data)
1617 {
1618         int ret;
1619         struct ext4_iloc iloc;
1620         void *inline_start;
1621         int inline_size;
1622
1623         if (ext4_get_inode_loc(dir, &iloc))
1624                 return NULL;
1625
1626         down_read(&EXT4_I(dir)->xattr_sem);
1627         if (!ext4_has_inline_data(dir)) {
1628                 *has_inline_data = 0;
1629                 goto out;
1630         }
1631
1632         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1633                                                 EXT4_INLINE_DOTDOT_SIZE;
1634         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1635         ret = search_dir(iloc.bh, inline_start, inline_size,
1636                          dir, d_name, 0, res_dir);
1637         if (ret == 1)
1638                 goto out_find;
1639         if (ret < 0)
1640                 goto out;
1641
1642         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1643                 goto out;
1644
1645         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1646         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1647
1648         ret = search_dir(iloc.bh, inline_start, inline_size,
1649                          dir, d_name, 0, res_dir);
1650         if (ret == 1)
1651                 goto out_find;
1652
1653 out:
1654         brelse(iloc.bh);
1655         iloc.bh = NULL;
1656 out_find:
1657         up_read(&EXT4_I(dir)->xattr_sem);
1658         return iloc.bh;
1659 }
1660
1661 int ext4_delete_inline_entry(handle_t *handle,
1662                              struct inode *dir,
1663                              struct ext4_dir_entry_2 *de_del,
1664                              struct buffer_head *bh,
1665                              int *has_inline_data)
1666 {
1667         int err, inline_size;
1668         struct ext4_iloc iloc;
1669         void *inline_start;
1670
1671         err = ext4_get_inode_loc(dir, &iloc);
1672         if (err)
1673                 return err;
1674
1675         down_write(&EXT4_I(dir)->xattr_sem);
1676         if (!ext4_has_inline_data(dir)) {
1677                 *has_inline_data = 0;
1678                 goto out;
1679         }
1680
1681         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1682                 EXT4_MIN_INLINE_DATA_SIZE) {
1683                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1684                                         EXT4_INLINE_DOTDOT_SIZE;
1685                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1686                                 EXT4_INLINE_DOTDOT_SIZE;
1687         } else {
1688                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1689                 inline_size = ext4_get_inline_size(dir) -
1690                                 EXT4_MIN_INLINE_DATA_SIZE;
1691         }
1692
1693         BUFFER_TRACE(bh, "get_write_access");
1694         err = ext4_journal_get_write_access(handle, bh);
1695         if (err)
1696                 goto out;
1697
1698         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1699                                         inline_start, inline_size, 0);
1700         if (err)
1701                 goto out;
1702
1703         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1704         err = ext4_mark_inode_dirty(handle, dir);
1705         if (unlikely(err))
1706                 goto out;
1707
1708         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1709 out:
1710         up_write(&EXT4_I(dir)->xattr_sem);
1711         brelse(iloc.bh);
1712         if (err != -ENOENT)
1713                 ext4_std_error(dir->i_sb, err);
1714         return err;
1715 }
1716
1717 /*
1718  * Get the inline dentry at offset.
1719  */
1720 static inline struct ext4_dir_entry_2 *
1721 ext4_get_inline_entry(struct inode *inode,
1722                       struct ext4_iloc *iloc,
1723                       unsigned int offset,
1724                       void **inline_start,
1725                       int *inline_size)
1726 {
1727         void *inline_pos;
1728
1729         BUG_ON(offset > ext4_get_inline_size(inode));
1730
1731         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1732                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1733                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1734         } else {
1735                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1736                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1737                 *inline_size = ext4_get_inline_size(inode) -
1738                                 EXT4_MIN_INLINE_DATA_SIZE;
1739         }
1740
1741         if (inline_start)
1742                 *inline_start = inline_pos;
1743         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1744 }
1745
1746 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1747 {
1748         int err, inline_size;
1749         struct ext4_iloc iloc;
1750         void *inline_pos;
1751         unsigned int offset;
1752         struct ext4_dir_entry_2 *de;
1753         int ret = 1;
1754
1755         err = ext4_get_inode_loc(dir, &iloc);
1756         if (err) {
1757                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1758                                  err, dir->i_ino);
1759                 return 1;
1760         }
1761
1762         down_read(&EXT4_I(dir)->xattr_sem);
1763         if (!ext4_has_inline_data(dir)) {
1764                 *has_inline_data = 0;
1765                 goto out;
1766         }
1767
1768         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1769         if (!le32_to_cpu(de->inode)) {
1770                 ext4_warning(dir->i_sb,
1771                              "bad inline directory (dir #%lu) - no `..'",
1772                              dir->i_ino);
1773                 ret = 1;
1774                 goto out;
1775         }
1776
1777         offset = EXT4_INLINE_DOTDOT_SIZE;
1778         while (offset < dir->i_size) {
1779                 de = ext4_get_inline_entry(dir, &iloc, offset,
1780                                            &inline_pos, &inline_size);
1781                 if (ext4_check_dir_entry(dir, NULL, de,
1782                                          iloc.bh, inline_pos,
1783                                          inline_size, offset)) {
1784                         ext4_warning(dir->i_sb,
1785                                      "bad inline directory (dir #%lu) - "
1786                                      "inode %u, rec_len %u, name_len %d"
1787                                      "inline size %d\n",
1788                                      dir->i_ino, le32_to_cpu(de->inode),
1789                                      le16_to_cpu(de->rec_len), de->name_len,
1790                                      inline_size);
1791                         ret = 1;
1792                         goto out;
1793                 }
1794                 if (le32_to_cpu(de->inode)) {
1795                         ret = 0;
1796                         goto out;
1797                 }
1798                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1799         }
1800
1801 out:
1802         up_read(&EXT4_I(dir)->xattr_sem);
1803         brelse(iloc.bh);
1804         return ret;
1805 }
1806
1807 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1808 {
1809         int ret;
1810
1811         down_write(&EXT4_I(inode)->xattr_sem);
1812         ret = ext4_destroy_inline_data_nolock(handle, inode);
1813         up_write(&EXT4_I(inode)->xattr_sem);
1814
1815         return ret;
1816 }
1817
1818 int ext4_inline_data_fiemap(struct inode *inode,
1819                             struct fiemap_extent_info *fieinfo,
1820                             int *has_inline, __u64 start, __u64 len)
1821 {
1822         __u64 physical = 0;
1823         __u64 inline_len;
1824         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1825                 FIEMAP_EXTENT_LAST;
1826         int error = 0;
1827         struct ext4_iloc iloc;
1828
1829         down_read(&EXT4_I(inode)->xattr_sem);
1830         if (!ext4_has_inline_data(inode)) {
1831                 *has_inline = 0;
1832                 goto out;
1833         }
1834         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1835                            i_size_read(inode));
1836         if (start >= inline_len)
1837                 goto out;
1838         if (start + len < inline_len)
1839                 inline_len = start + len;
1840         inline_len -= start;
1841
1842         error = ext4_get_inode_loc(inode, &iloc);
1843         if (error)
1844                 goto out;
1845
1846         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1847         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1848         physical += offsetof(struct ext4_inode, i_block);
1849
1850         if (physical)
1851                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1852                                                 inline_len, flags);
1853         brelse(iloc.bh);
1854 out:
1855         up_read(&EXT4_I(inode)->xattr_sem);
1856         return (error < 0 ? error : 0);
1857 }
1858
1859 /*
1860  * Called during xattr set, and if we can sparse space 'needed',
1861  * just create the extent tree evict the data to the outer block.
1862  *
1863  * We use jbd2 instead of page cache to move data to the 1st block
1864  * so that the whole transaction can be committed as a whole and
1865  * the data isn't lost because of the delayed page cache write.
1866  */
1867 int ext4_try_to_evict_inline_data(handle_t *handle,
1868                                   struct inode *inode,
1869                                   int needed)
1870 {
1871         int error;
1872         struct ext4_xattr_entry *entry;
1873         struct ext4_inode *raw_inode;
1874         struct ext4_iloc iloc;
1875
1876         error = ext4_get_inode_loc(inode, &iloc);
1877         if (error)
1878                 return error;
1879
1880         raw_inode = ext4_raw_inode(&iloc);
1881         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1882                                             EXT4_I(inode)->i_inline_off);
1883         if (EXT4_XATTR_LEN(entry->e_name_len) +
1884             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1885                 error = -ENOSPC;
1886                 goto out;
1887         }
1888
1889         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1890 out:
1891         brelse(iloc.bh);
1892         return error;
1893 }
1894
1895 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1896 {
1897         handle_t *handle;
1898         int inline_size, value_len, needed_blocks;
1899         size_t i_size;
1900         void *value = NULL;
1901         struct ext4_xattr_ibody_find is = {
1902                 .s = { .not_found = -ENODATA, },
1903         };
1904         struct ext4_xattr_info i = {
1905                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1906                 .name = EXT4_XATTR_SYSTEM_DATA,
1907         };
1908
1909
1910         needed_blocks = ext4_writepage_trans_blocks(inode);
1911         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1912         if (IS_ERR(handle))
1913                 return;
1914
1915         down_write(&EXT4_I(inode)->xattr_sem);
1916         if (!ext4_has_inline_data(inode)) {
1917                 *has_inline = 0;
1918                 ext4_journal_stop(handle);
1919                 return;
1920         }
1921
1922         if (ext4_orphan_add(handle, inode))
1923                 goto out;
1924
1925         if (ext4_get_inode_loc(inode, &is.iloc))
1926                 goto out;
1927
1928         down_write(&EXT4_I(inode)->i_data_sem);
1929         i_size = inode->i_size;
1930         inline_size = ext4_get_inline_size(inode);
1931         EXT4_I(inode)->i_disksize = i_size;
1932
1933         if (i_size < inline_size) {
1934                 /* Clear the content in the xattr space. */
1935                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1936                         if (ext4_xattr_ibody_find(inode, &i, &is))
1937                                 goto out_error;
1938
1939                         BUG_ON(is.s.not_found);
1940
1941                         value_len = le32_to_cpu(is.s.here->e_value_size);
1942                         value = kmalloc(value_len, GFP_NOFS);
1943                         if (!value)
1944                                 goto out_error;
1945
1946                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1947                                                 value, value_len))
1948                                 goto out_error;
1949
1950                         i.value = value;
1951                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1952                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1953                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1954                                 goto out_error;
1955                 }
1956
1957                 /* Clear the content within i_blocks. */
1958                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1959                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1960                         memset(p + i_size, 0,
1961                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1962                 }
1963
1964                 EXT4_I(inode)->i_inline_size = i_size <
1965                                         EXT4_MIN_INLINE_DATA_SIZE ?
1966                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1967         }
1968
1969 out_error:
1970         up_write(&EXT4_I(inode)->i_data_sem);
1971 out:
1972         brelse(is.iloc.bh);
1973         up_write(&EXT4_I(inode)->xattr_sem);
1974         kfree(value);
1975         if (inode->i_nlink)
1976                 ext4_orphan_del(handle, inode);
1977
1978         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1979         ext4_mark_inode_dirty(handle, inode);
1980         if (IS_SYNC(inode))
1981                 ext4_handle_sync(handle);
1982
1983         ext4_journal_stop(handle);
1984         return;
1985 }
1986
1987 int ext4_convert_inline_data(struct inode *inode)
1988 {
1989         int error, needed_blocks;
1990         handle_t *handle;
1991         struct ext4_iloc iloc;
1992
1993         if (!ext4_has_inline_data(inode)) {
1994                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1995                 return 0;
1996         }
1997
1998         needed_blocks = ext4_writepage_trans_blocks(inode);
1999
2000         iloc.bh = NULL;
2001         error = ext4_get_inode_loc(inode, &iloc);
2002         if (error)
2003                 return error;
2004
2005         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2006         if (IS_ERR(handle)) {
2007                 error = PTR_ERR(handle);
2008                 goto out_free;
2009         }
2010
2011         down_write(&EXT4_I(inode)->xattr_sem);
2012         if (!ext4_has_inline_data(inode)) {
2013                 up_write(&EXT4_I(inode)->xattr_sem);
2014                 goto out;
2015         }
2016
2017         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2018         up_write(&EXT4_I(inode)->xattr_sem);
2019 out:
2020         ext4_journal_stop(handle);
2021 out_free:
2022         brelse(iloc.bh);
2023         return error;
2024 }