fs/ext4/inline.c

   1 /*
   2  * Copyright (c) 2012 Taobao.
   3  * Written by Tao Ma <boyu.mt@taobao.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/fiemap.h>
  16
  17 #include "ext4_jbd2.h"
  18 #include "ext4.h"
  19 #include "xattr.h"
  20 #include "truncate.h"
  21
  22 #define EXT4_XATTR_SYSTEM_DATA  "data"
  23 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  24 #define EXT4_INLINE_DOTDOT_OFFSET       2
  25 #define EXT4_INLINE_DOTDOT_SIZE         4
  26
  27 static int ext4_get_inline_size(struct inode *inode)
  28 {
  29         if (EXT4_I(inode)->i_inline_off)
  30                 return EXT4_I(inode)->i_inline_size;
  31
  32         return 0;
  33 }
  34
  35 static int get_max_inline_xattr_value_size(struct inode *inode,
  36                                            struct ext4_iloc *iloc)
  37 {
  38         struct ext4_xattr_ibody_header *header;
  39         struct ext4_xattr_entry *entry;
  40         struct ext4_inode *raw_inode;
  41         int free, min_offs;
  42
  43         if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
  44                 return 0;
  45
  46         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  47                         EXT4_GOOD_OLD_INODE_SIZE -
  48                         EXT4_I(inode)->i_extra_isize -
  49                         sizeof(struct ext4_xattr_ibody_header);
  50
  51         /*
  52          * We need to subtract another sizeof(__u32) since an in-inode xattr
  53          * needs an empty 4 bytes to indicate the gap between the xattr entry
  54          * and the name/value pair.
  55          */
  56         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  57                 return EXT4_XATTR_SIZE(min_offs -
  58                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  59                         EXT4_XATTR_ROUND - sizeof(__u32));
  60
  61         raw_inode = ext4_raw_inode(iloc);
  62         header = IHDR(inode, raw_inode);
  63         entry = IFIRST(header);
  64
  65         /* Compute min_offs. */
  66         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  67                 if (!entry->e_value_block && entry->e_value_size) {
  68                         size_t offs = le16_to_cpu(entry->e_value_offs);
  69                         if (offs < min_offs)
  70                                 min_offs = offs;
  71                 }
  72         }
  73         free = min_offs -
  74                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  75
  76         if (EXT4_I(inode)->i_inline_off) {
  77                 entry = (struct ext4_xattr_entry *)
  78                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  79
  80                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  81                 goto out;
  82         }
  83
  84         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  85
  86         if (free > EXT4_XATTR_ROUND)
  87                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  88         else
  89                 free = 0;
  90
  91 out:
  92         return free;
  93 }
  94
  95 /*
  96  * Get the maximum size we now can store in an inode.
  97  * If we can't find the space for a xattr entry, don't use the space
  98  * of the extents since we have no space to indicate the inline data.
  99  */
 100 int ext4_get_max_inline_size(struct inode *inode)
 101 {
 102         int error, max_inline_size;
 103         struct ext4_iloc iloc;
 104
 105         if (EXT4_I(inode)->i_extra_isize == 0)
 106                 return 0;
 107
 108         error = ext4_get_inode_loc(inode, &iloc);
 109         if (error) {
 110                 ext4_error_inode(inode, __func__, __LINE__, 0,
 111                                  "can't get inode location %lu",
 112                                  inode->i_ino);
 113                 return 0;
 114         }
 115
 116         down_read(&EXT4_I(inode)->xattr_sem);
 117         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 118         up_read(&EXT4_I(inode)->xattr_sem);
 119
 120         brelse(iloc.bh);
 121
 122         if (!max_inline_size)
 123                 return 0;
 124
 125         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 126 }
 127
 128 /*
 129  * this function does not take xattr_sem, which is OK because it is
 130  * currently only used in a code path coming form ext4_iget, before
 131  * the new inode has been unlocked
 132  */
 133 int ext4_find_inline_data_nolock(struct inode *inode)
 134 {
 135         struct ext4_xattr_ibody_find is = {
 136                 .s = { .not_found = -ENODATA, },
 137         };
 138         struct ext4_xattr_info i = {
 139                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 140                 .name = EXT4_XATTR_SYSTEM_DATA,
 141         };
 142         int error;
 143
 144         if (EXT4_I(inode)->i_extra_isize == 0)
 145                 return 0;
 146
 147         error = ext4_get_inode_loc(inode, &is.iloc);
 148         if (error)
 149                 return error;
 150
 151         error = ext4_xattr_ibody_find(inode, &i, &is);
 152         if (error)
 153                 goto out;
 154
 155         if (!is.s.not_found) {
 156                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 157                                         (void *)ext4_raw_inode(&is.iloc));
 158                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 159                                 le32_to_cpu(is.s.here->e_value_size);
 160                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 161         }
 162 out:
 163         brelse(is.iloc.bh);
 164         return error;
 165 }
 166
 167 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 168                                  unsigned int len,
 169                                  struct ext4_iloc *iloc)
 170 {
 171         struct ext4_xattr_entry *entry;
 172         struct ext4_xattr_ibody_header *header;
 173         int cp_len = 0;
 174         struct ext4_inode *raw_inode;
 175
 176         if (!len)
 177                 return 0;
 178
 179         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 180
 181         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 182                         len : EXT4_MIN_INLINE_DATA_SIZE;
 183
 184         raw_inode = ext4_raw_inode(iloc);
 185         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 186
 187         len -= cp_len;
 188         buffer += cp_len;
 189
 190         if (!len)
 191                 goto out;
 192
 193         header = IHDR(inode, raw_inode);
 194         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 195                                             EXT4_I(inode)->i_inline_off);
 196         len = min_t(unsigned int, len,
 197                     (unsigned int)le32_to_cpu(entry->e_value_size));
 198
 199         memcpy(buffer,
 200                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 201         cp_len += len;
 202
 203 out:
 204         return cp_len;
 205 }
 206
 207 /*
 208  * write the buffer to the inline inode.
 209  * If 'create' is set, we don't need to do the extra copy in the xattr
 210  * value since it is already handled by ext4_xattr_ibody_inline_set.
 211  * That saves us one memcpy.
 212  */
 213 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 214                                    void *buffer, loff_t pos, unsigned int len)
 215 {
 216         struct ext4_xattr_entry *entry;
 217         struct ext4_xattr_ibody_header *header;
 218         struct ext4_inode *raw_inode;
 219         int cp_len = 0;
 220
 221         BUG_ON(!EXT4_I(inode)->i_inline_off);
 222         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 223
 224         raw_inode = ext4_raw_inode(iloc);
 225         buffer += pos;
 226
 227         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 228                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 229                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 230                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 231
 232                 len -= cp_len;
 233                 buffer += cp_len;
 234                 pos += cp_len;
 235         }
 236
 237         if (!len)
 238                 return;
 239
 240         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 241         header = IHDR(inode, raw_inode);
 242         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 243                                             EXT4_I(inode)->i_inline_off);
 244
 245         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 246                buffer, len);
 247 }
 248
 249 static int ext4_create_inline_data(handle_t *handle,
 250                                    struct inode *inode, unsigned len)
 251 {
 252         int error;
 253         void *value = NULL;
 254         struct ext4_xattr_ibody_find is = {
 255                 .s = { .not_found = -ENODATA, },
 256         };
 257         struct ext4_xattr_info i = {
 258                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 259                 .name = EXT4_XATTR_SYSTEM_DATA,
 260         };
 261
 262         error = ext4_get_inode_loc(inode, &is.iloc);
 263         if (error)
 264                 return error;
 265
 266         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 267         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 268         if (error)
 269                 goto out;
 270
 271         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 272                 value = EXT4_ZERO_XATTR_VALUE;
 273                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 274         } else {
 275                 value = "";
 276                 len = 0;
 277         }
 278
 279         /* Insert the the xttr entry. */
 280         i.value = value;
 281         i.value_len = len;
 282
 283         error = ext4_xattr_ibody_find(inode, &i, &is);
 284         if (error)
 285                 goto out;
 286
 287         BUG_ON(!is.s.not_found);
 288
 289         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 290         if (error) {
 291                 if (error == -ENOSPC)
 292                         ext4_clear_inode_state(inode,
 293                                                EXT4_STATE_MAY_INLINE_DATA);
 294                 goto out;
 295         }
 296
 297         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 298                 0, EXT4_MIN_INLINE_DATA_SIZE);
 299
 300         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 301                                       (void *)ext4_raw_inode(&is.iloc));
 302         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 303         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 304         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 305         get_bh(is.iloc.bh);
 306         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 307
 308 out:
 309         brelse(is.iloc.bh);
 310         return error;
 311 }
 312
 313 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 314                                    unsigned int len)
 315 {
 316         int error;
 317         void *value = NULL;
 318         struct ext4_xattr_ibody_find is = {
 319                 .s = { .not_found = -ENODATA, },
 320         };
 321         struct ext4_xattr_info i = {
 322                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 323                 .name = EXT4_XATTR_SYSTEM_DATA,
 324         };
 325
 326         /* If the old space is ok, write the data directly. */
 327         if (len <= EXT4_I(inode)->i_inline_size)
 328                 return 0;
 329
 330         error = ext4_get_inode_loc(inode, &is.iloc);
 331         if (error)
 332                 return error;
 333
 334         error = ext4_xattr_ibody_find(inode, &i, &is);
 335         if (error)
 336                 goto out;
 337
 338         BUG_ON(is.s.not_found);
 339
 340         len -= EXT4_MIN_INLINE_DATA_SIZE;
 341         value = kzalloc(len, GFP_NOFS);
 342         if (!value) {
 343                 error = -ENOMEM;
 344                 goto out;
 345         }
 346
 347         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 348                                      value, len);
 349         if (error == -ENODATA)
 350                 goto out;
 351
 352         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 353         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 354         if (error)
 355                 goto out;
 356
 357         /* Update the xttr entry. */
 358         i.value = value;
 359         i.value_len = len;
 360
 361         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 362         if (error)
 363                 goto out;
 364
 365         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 366                                       (void *)ext4_raw_inode(&is.iloc));
 367         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 368                                 le32_to_cpu(is.s.here->e_value_size);
 369         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 370         get_bh(is.iloc.bh);
 371         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 372
 373 out:
 374         kfree(value);
 375         brelse(is.iloc.bh);
 376         return error;
 377 }
 378
 379 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 380                                     unsigned int len)
 381 {
 382         int ret, size, no_expand;
 383         struct ext4_inode_info *ei = EXT4_I(inode);
 384
 385         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 386                 return -ENOSPC;
 387
 388         size = ext4_get_max_inline_size(inode);
 389         if (size < len)
 390                 return -ENOSPC;
 391
 392         ext4_write_lock_xattr(inode, &no_expand);
 393
 394         if (ei->i_inline_off)
 395                 ret = ext4_update_inline_data(handle, inode, len);
 396         else
 397                 ret = ext4_create_inline_data(handle, inode, len);
 398
 399         ext4_write_unlock_xattr(inode, &no_expand);
 400         return ret;
 401 }
 402
 403 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 404                                            struct inode *inode)
 405 {
 406         struct ext4_inode_info *ei = EXT4_I(inode);
 407         struct ext4_xattr_ibody_find is = {
 408                 .s = { .not_found = 0, },
 409         };
 410         struct ext4_xattr_info i = {
 411                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 412                 .name = EXT4_XATTR_SYSTEM_DATA,
 413                 .value = NULL,
 414                 .value_len = 0,
 415         };
 416         int error;
 417
 418         if (!ei->i_inline_off)
 419                 return 0;
 420
 421         error = ext4_get_inode_loc(inode, &is.iloc);
 422         if (error)
 423                 return error;
 424
 425         error = ext4_xattr_ibody_find(inode, &i, &is);
 426         if (error)
 427                 goto out;
 428
 429         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 430         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 431         if (error)
 432                 goto out;
 433
 434         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 435         if (error)
 436                 goto out;
 437
 438         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 439                 0, EXT4_MIN_INLINE_DATA_SIZE);
 440         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 441
 442         if (ext4_has_feature_extents(inode->i_sb)) {
 443                 if (S_ISDIR(inode->i_mode) ||
 444                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 445                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 446                         ext4_ext_tree_init(handle, inode);
 447                 }
 448         }
 449         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 450
 451         get_bh(is.iloc.bh);
 452         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 453
 454         EXT4_I(inode)->i_inline_off = 0;
 455         EXT4_I(inode)->i_inline_size = 0;
 456         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 457 out:
 458         brelse(is.iloc.bh);
 459         if (error == -ENODATA)
 460                 error = 0;
 461         return error;
 462 }
 463
 464 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 465 {
 466         void *kaddr;
 467         int ret = 0;
 468         size_t len;
 469         struct ext4_iloc iloc;
 470
 471         BUG_ON(!PageLocked(page));
 472         BUG_ON(!ext4_has_inline_data(inode));
 473         BUG_ON(page->index);
 474
 475         if (!EXT4_I(inode)->i_inline_off) {
 476                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 477                              inode->i_ino);
 478                 goto out;
 479         }
 480
 481         ret = ext4_get_inode_loc(inode, &iloc);
 482         if (ret)
 483                 goto out;
 484
 485         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 486         kaddr = kmap_atomic(page);
 487         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 488         flush_dcache_page(page);
 489         kunmap_atomic(kaddr);
 490         zero_user_segment(page, len, PAGE_SIZE);
 491         SetPageUptodate(page);
 492         brelse(iloc.bh);
 493
 494 out:
 495         return ret;
 496 }
 497
 498 int ext4_readpage_inline(struct inode *inode, struct page *page)
 499 {
 500         int ret = 0;
 501
 502         down_read(&EXT4_I(inode)->xattr_sem);
 503         if (!ext4_has_inline_data(inode)) {
 504                 up_read(&EXT4_I(inode)->xattr_sem);
 505                 return -EAGAIN;
 506         }
 507
 508         /*
 509          * Current inline data can only exist in the 1st page,
 510          * So for all the other pages, just set them uptodate.
 511          */
 512         if (!page->index)
 513                 ret = ext4_read_inline_page(inode, page);
 514         else if (!PageUptodate(page)) {
 515                 zero_user_segment(page, 0, PAGE_SIZE);
 516                 SetPageUptodate(page);
 517         }
 518
 519         up_read(&EXT4_I(inode)->xattr_sem);
 520
 521         unlock_page(page);
 522         return ret >= 0 ? 0 : ret;
 523 }
 524
 525 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 526                                               struct inode *inode,
 527                                               unsigned flags)
 528 {
 529         int ret, needed_blocks, no_expand;
 530         handle_t *handle = NULL;
 531         int retries = 0, sem_held = 0;
 532         struct page *page = NULL;
 533         unsigned from, to;
 534         struct ext4_iloc iloc;
 535
 536         if (!ext4_has_inline_data(inode)) {
 537                 /*
 538                  * clear the flag so that no new write
 539                  * will trap here again.
 540                  */
 541                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 542                 return 0;
 543         }
 544
 545         needed_blocks = ext4_writepage_trans_blocks(inode);
 546
 547         ret = ext4_get_inode_loc(inode, &iloc);
 548         if (ret)
 549                 return ret;
 550
 551 retry:
 552         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 553         if (IS_ERR(handle)) {
 554                 ret = PTR_ERR(handle);
 555                 handle = NULL;
 556                 goto out;
 557         }
 558
 559         /* We cannot recurse into the filesystem as the transaction is already
 560          * started */
 561         flags |= AOP_FLAG_NOFS;
 562
 563         page = grab_cache_page_write_begin(mapping, 0, flags);
 564         if (!page) {
 565                 ret = -ENOMEM;
 566                 goto out;
 567         }
 568
 569         ext4_write_lock_xattr(inode, &no_expand);
 570         sem_held = 1;
 571         /* If some one has already done this for us, just exit. */
 572         if (!ext4_has_inline_data(inode)) {
 573                 ret = 0;
 574                 goto out;
 575         }
 576
 577         from = 0;
 578         to = ext4_get_inline_size(inode);
 579         if (!PageUptodate(page)) {
 580                 ret = ext4_read_inline_page(inode, page);
 581                 if (ret < 0)
 582                         goto out;
 583         }
 584
 585         ret = ext4_destroy_inline_data_nolock(handle, inode);
 586         if (ret)
 587                 goto out;
 588
 589         if (ext4_should_dioread_nolock(inode)) {
 590                 ret = __block_write_begin(page, from, to,
 591                                           ext4_get_block_unwritten);
 592         } else
 593                 ret = __block_write_begin(page, from, to, ext4_get_block);
 594
 595         if (!ret && ext4_should_journal_data(inode)) {
 596                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 597                                              from, to, NULL,
 598                                              do_journal_get_write_access);
 599         }
 600
 601         if (ret) {
 602                 unlock_page(page);
 603                 put_page(page);
 604                 page = NULL;
 605                 ext4_orphan_add(handle, inode);
 606                 ext4_write_unlock_xattr(inode, &no_expand);
 607                 sem_held = 0;
 608                 ext4_journal_stop(handle);
 609                 handle = NULL;
 610                 ext4_truncate_failed_write(inode);
 611                 /*
 612                  * If truncate failed early the inode might
 613                  * still be on the orphan list; we need to
 614                  * make sure the inode is removed from the
 615                  * orphan list in that case.
 616                  */
 617                 if (inode->i_nlink)
 618                         ext4_orphan_del(NULL, inode);
 619         }
 620
 621         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 622                 goto retry;
 623
 624         if (page)
 625                 block_commit_write(page, from, to);
 626 out:
 627         if (page) {
 628                 unlock_page(page);
 629                 put_page(page);
 630         }
 631         if (sem_held)
 632                 ext4_write_unlock_xattr(inode, &no_expand);
 633         if (handle)
 634                 ext4_journal_stop(handle);
 635         brelse(iloc.bh);
 636         return ret;
 637 }
 638
 639 /*
 640  * Try to write data in the inode.
 641  * If the inode has inline data, check whether the new write can be
 642  * in the inode also. If not, create the page the handle, move the data
 643  * to the page make it update and let the later codes create extent for it.
 644  */
 645 int ext4_try_to_write_inline_data(struct address_space *mapping,
 646                                   struct inode *inode,
 647                                   loff_t pos, unsigned len,
 648                                   unsigned flags,
 649                                   struct page **pagep)
 650 {
 651         int ret;
 652         handle_t *handle;
 653         struct page *page;
 654         struct ext4_iloc iloc;
 655
 656         if (pos + len > ext4_get_max_inline_size(inode))
 657                 goto convert;
 658
 659         ret = ext4_get_inode_loc(inode, &iloc);
 660         if (ret)
 661                 return ret;
 662
 663         /*
 664          * The possible write could happen in the inode,
 665          * so try to reserve the space in inode first.
 666          */
 667         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 668         if (IS_ERR(handle)) {
 669                 ret = PTR_ERR(handle);
 670                 handle = NULL;
 671                 goto out;
 672         }
 673
 674         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 675         if (ret && ret != -ENOSPC)
 676                 goto out;
 677
 678         /* We don't have space in inline inode, so convert it to extent. */
 679         if (ret == -ENOSPC) {
 680                 ext4_journal_stop(handle);
 681                 brelse(iloc.bh);
 682                 goto convert;
 683         }
 684
 685         ret = ext4_journal_get_write_access(handle, iloc.bh);
 686         if (ret)
 687                 goto out;
 688
 689         flags |= AOP_FLAG_NOFS;
 690
 691         page = grab_cache_page_write_begin(mapping, 0, flags);
 692         if (!page) {
 693                 ret = -ENOMEM;
 694                 goto out;
 695         }
 696
 697         *pagep = page;
 698         down_read(&EXT4_I(inode)->xattr_sem);
 699         if (!ext4_has_inline_data(inode)) {
 700                 ret = 0;
 701                 unlock_page(page);
 702                 put_page(page);
 703                 goto out_up_read;
 704         }
 705
 706         if (!PageUptodate(page)) {
 707                 ret = ext4_read_inline_page(inode, page);
 708                 if (ret < 0) {
 709                         unlock_page(page);
 710                         put_page(page);
 711                         goto out_up_read;
 712                 }
 713         }
 714
 715         ret = 1;
 716         handle = NULL;
 717 out_up_read:
 718         up_read(&EXT4_I(inode)->xattr_sem);
 719 out:
 720         if (handle && (ret != 1))
 721                 ext4_journal_stop(handle);
 722         brelse(iloc.bh);
 723         return ret;
 724 convert:
 725         return ext4_convert_inline_data_to_extent(mapping,
 726                                                   inode, flags);
 727 }
 728
 729 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 730                                unsigned copied, struct page *page)
 731 {
 732         int ret, no_expand;
 733         void *kaddr;
 734         struct ext4_iloc iloc;
 735
 736         if (unlikely(copied < len)) {
 737                 if (!PageUptodate(page)) {
 738                         copied = 0;
 739                         goto out;
 740                 }
 741         }
 742
 743         ret = ext4_get_inode_loc(inode, &iloc);
 744         if (ret) {
 745                 ext4_std_error(inode->i_sb, ret);
 746                 copied = 0;
 747                 goto out;
 748         }
 749
 750         ext4_write_lock_xattr(inode, &no_expand);
 751         BUG_ON(!ext4_has_inline_data(inode));
 752
 753         /*
 754          * ei->i_inline_off may have changed since ext4_write_begin()
 755          * called ext4_try_to_write_inline_data()
 756          */
 757         (void) ext4_find_inline_data_nolock(inode);
 758
 759         kaddr = kmap_atomic(page);
 760         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 761         kunmap_atomic(kaddr);
 762         SetPageUptodate(page);
 763         /* clear page dirty so that writepages wouldn't work for us. */
 764         ClearPageDirty(page);
 765
 766         ext4_write_unlock_xattr(inode, &no_expand);
 767         brelse(iloc.bh);
 768         mark_inode_dirty(inode);
 769 out:
 770         return copied;
 771 }
 772
 773 struct buffer_head *
 774 ext4_journalled_write_inline_data(struct inode *inode,
 775                                   unsigned len,
 776                                   struct page *page)
 777 {
 778         int ret, no_expand;
 779         void *kaddr;
 780         struct ext4_iloc iloc;
 781
 782         ret = ext4_get_inode_loc(inode, &iloc);
 783         if (ret) {
 784                 ext4_std_error(inode->i_sb, ret);
 785                 return NULL;
 786         }
 787
 788         ext4_write_lock_xattr(inode, &no_expand);
 789         kaddr = kmap_atomic(page);
 790         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 791         kunmap_atomic(kaddr);
 792         ext4_write_unlock_xattr(inode, &no_expand);
 793
 794         return iloc.bh;
 795 }
 796
 797 /*
 798  * Try to make the page cache and handle ready for the inline data case.
 799  * We can call this function in 2 cases:
 800  * 1. The inode is created and the first write exceeds inline size. We can
 801  *    clear the inode state safely.
 802  * 2. The inode has inline data, then we need to read the data, make it
 803  *    update and dirty so that ext4_da_writepages can handle it. We don't
 804  *    need to start the journal since the file's metatdata isn't changed now.
 805  */
 806 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 807                                                  struct inode *inode,
 808                                                  unsigned flags,
 809                                                  void **fsdata)
 810 {
 811         int ret = 0, inline_size;
 812         struct page *page;
 813
 814         page = grab_cache_page_write_begin(mapping, 0, flags);
 815         if (!page)
 816                 return -ENOMEM;
 817
 818         down_read(&EXT4_I(inode)->xattr_sem);
 819         if (!ext4_has_inline_data(inode)) {
 820                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 821                 goto out;
 822         }
 823
 824         inline_size = ext4_get_inline_size(inode);
 825
 826         if (!PageUptodate(page)) {
 827                 ret = ext4_read_inline_page(inode, page);
 828                 if (ret < 0)
 829                         goto out;
 830         }
 831
 832         ret = __block_write_begin(page, 0, inline_size,
 833                                   ext4_da_get_block_prep);
 834         if (ret) {
 835                 up_read(&EXT4_I(inode)->xattr_sem);
 836                 unlock_page(page);
 837                 put_page(page);
 838                 ext4_truncate_failed_write(inode);
 839                 return ret;
 840         }
 841
 842         SetPageDirty(page);
 843         SetPageUptodate(page);
 844         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 845         *fsdata = (void *)CONVERT_INLINE_DATA;
 846
 847 out:
 848         up_read(&EXT4_I(inode)->xattr_sem);
 849         if (page) {
 850                 unlock_page(page);
 851                 put_page(page);
 852         }
 853         return ret;
 854 }
 855
 856 /*
 857  * Prepare the write for the inline data.
 858  * If the the data can be written into the inode, we just read
 859  * the page and make it uptodate, and start the journal.
 860  * Otherwise read the page, makes it dirty so that it can be
 861  * handle in writepages(the i_disksize update is left to the
 862  * normal ext4_da_write_end).
 863  */
 864 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 865                                     struct inode *inode,
 866                                     loff_t pos, unsigned len,
 867                                     unsigned flags,
 868                                     struct page **pagep,
 869                                     void **fsdata)
 870 {
 871         int ret, inline_size;
 872         handle_t *handle;
 873         struct page *page;
 874         struct ext4_iloc iloc;
 875         int retries = 0;
 876
 877         ret = ext4_get_inode_loc(inode, &iloc);
 878         if (ret)
 879                 return ret;
 880
 881 retry_journal:
 882         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 883         if (IS_ERR(handle)) {
 884                 ret = PTR_ERR(handle);
 885                 goto out;
 886         }
 887
 888         inline_size = ext4_get_max_inline_size(inode);
 889
 890         ret = -ENOSPC;
 891         if (inline_size >= pos + len) {
 892                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 893                 if (ret && ret != -ENOSPC)
 894                         goto out_journal;
 895         }
 896
 897         /*
 898          * We cannot recurse into the filesystem as the transaction
 899          * is already started.
 900          */
 901         flags |= AOP_FLAG_NOFS;
 902
 903         if (ret == -ENOSPC) {
 904                 ext4_journal_stop(handle);
 905                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 906                                                             inode,
 907                                                             flags,
 908                                                             fsdata);
 909                 if (ret == -ENOSPC &&
 910                     ext4_should_retry_alloc(inode->i_sb, &retries))
 911                         goto retry_journal;
 912                 goto out;
 913         }
 914
 915         page = grab_cache_page_write_begin(mapping, 0, flags);
 916         if (!page) {
 917                 ret = -ENOMEM;
 918                 goto out_journal;
 919         }
 920
 921         down_read(&EXT4_I(inode)->xattr_sem);
 922         if (!ext4_has_inline_data(inode)) {
 923                 ret = 0;
 924                 goto out_release_page;
 925         }
 926
 927         if (!PageUptodate(page)) {
 928                 ret = ext4_read_inline_page(inode, page);
 929                 if (ret < 0)
 930                         goto out_release_page;
 931         }
 932         ret = ext4_journal_get_write_access(handle, iloc.bh);
 933         if (ret)
 934                 goto out_release_page;
 935
 936         up_read(&EXT4_I(inode)->xattr_sem);
 937         *pagep = page;
 938         brelse(iloc.bh);
 939         return 1;
 940 out_release_page:
 941         up_read(&EXT4_I(inode)->xattr_sem);
 942         unlock_page(page);
 943         put_page(page);
 944 out_journal:
 945         ext4_journal_stop(handle);
 946 out:
 947         brelse(iloc.bh);
 948         return ret;
 949 }
 950
 951 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 952                                   unsigned len, unsigned copied,
 953                                   struct page *page)
 954 {
 955         int ret;
 956
 957         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 958         if (ret < 0) {
 959                 unlock_page(page);
 960                 put_page(page);
 961                 return ret;
 962         }
 963         copied = ret;
 964
 965         /*
 966          * No need to use i_size_read() here, the i_size
 967          * cannot change under us because we hold i_mutex.
 968          *
 969          * But it's important to update i_size while still holding page lock:
 970          * page writeout could otherwise come in and zero beyond i_size.
 971          */
 972         if (pos+copied > inode->i_size)
 973                 i_size_write(inode, pos+copied);
 974         unlock_page(page);
 975         put_page(page);
 976
 977         /*
 978          * Don't mark the inode dirty under page lock. First, it unnecessarily
 979          * makes the holding time of page lock longer. Second, it forces lock
 980          * ordering of page lock and transaction start for journaling
 981          * filesystems.
 982          */
 983         mark_inode_dirty(inode);
 984
 985         return copied;
 986 }
 987
 988 #ifdef INLINE_DIR_DEBUG
 989 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 990                           void *inline_start, int inline_size)
 991 {
 992         int offset;
 993         unsigned short de_len;
 994         struct ext4_dir_entry_2 *de = inline_start;
 995         void *dlimit = inline_start + inline_size;
 996
 997         trace_printk("inode %lu\n", dir->i_ino);
 998         offset = 0;
 999         while ((void *)de < dlimit) {
1000                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1001                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1002                              offset, de_len, de->name_len, de->name,
1003                              de->name_len, le32_to_cpu(de->inode));
1004                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1005                                          inline_start, inline_size, offset))
1006                         BUG();
1007
1008                 offset += de_len;
1009                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1010         }
1011 }
1012 #else
1013 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1014 #endif
1015
1016 /*
1017  * Add a new entry into a inline dir.
1018  * It will return -ENOSPC if no space is available, and -EIO
1019  * and -EEXIST if directory entry already exists.
1020  */
1021 static int ext4_add_dirent_to_inline(handle_t *handle,
1022                                      struct ext4_filename *fname,
1023                                      struct inode *dir,
1024                                      struct inode *inode,
1025                                      struct ext4_iloc *iloc,
1026                                      void *inline_start, int inline_size)
1027 {
1028         int             err;
1029         struct ext4_dir_entry_2 *de;
1030
1031         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1032                                 inline_size, fname, &de);
1033         if (err)
1034                 return err;
1035
1036         BUFFER_TRACE(iloc->bh, "get_write_access");
1037         err = ext4_journal_get_write_access(handle, iloc->bh);
1038         if (err)
1039                 return err;
1040         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1041
1042         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1043
1044         /*
1045          * XXX shouldn't update any times until successful
1046          * completion of syscall, but too many callers depend
1047          * on this.
1048          *
1049          * XXX similarly, too many callers depend on
1050          * ext4_new_inode() setting the times, but error
1051          * recovery deletes the inode, so the worst that can
1052          * happen is that the times are slightly out of date
1053          * and/or different from the directory change time.
1054          */
1055         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1056         ext4_update_dx_flag(dir);
1057         dir->i_version++;
1058         ext4_mark_inode_dirty(handle, dir);
1059         return 1;
1060 }
1061
1062 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1063                                        struct ext4_iloc *iloc)
1064 {
1065         struct ext4_xattr_entry *entry;
1066         struct ext4_xattr_ibody_header *header;
1067
1068         BUG_ON(!EXT4_I(inode)->i_inline_off);
1069
1070         header = IHDR(inode, ext4_raw_inode(iloc));
1071         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1072                                             EXT4_I(inode)->i_inline_off);
1073
1074         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1075 }
1076
1077 /* Set the final de to cover the whole block. */
1078 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1079 {
1080         struct ext4_dir_entry_2 *de, *prev_de;
1081         void *limit;
1082         int de_len;
1083
1084         de = (struct ext4_dir_entry_2 *)de_buf;
1085         if (old_size) {
1086                 limit = de_buf + old_size;
1087                 do {
1088                         prev_de = de;
1089                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1090                         de_buf += de_len;
1091                         de = (struct ext4_dir_entry_2 *)de_buf;
1092                 } while (de_buf < limit);
1093
1094                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1095                                                         old_size, new_size);
1096         } else {
1097                 /* this is just created, so create an empty entry. */
1098                 de->inode = 0;
1099                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1100         }
1101 }
1102
1103 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1104                                   struct ext4_iloc *iloc)
1105 {
1106         int ret;
1107         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1108         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1109
1110         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1111                 return -ENOSPC;
1112
1113         ret = ext4_update_inline_data(handle, dir,
1114                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1115         if (ret)
1116                 return ret;
1117
1118         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1119                              EXT4_I(dir)->i_inline_size -
1120                                                 EXT4_MIN_INLINE_DATA_SIZE);
1121         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1122         return 0;
1123 }
1124
1125 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1126                                      struct ext4_iloc *iloc,
1127                                      void *buf, int inline_size)
1128 {
1129         int ret;
1130
1131         ret = ext4_create_inline_data(handle, inode, inline_size);
1132         if (ret) {
1133                 ext4_msg(inode->i_sb, KERN_EMERG,
1134                         "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1135                         inode->i_ino, ret);
1136                 return;
1137         }
1138         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1139         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1140 }
1141
1142 static int ext4_finish_convert_inline_dir(handle_t *handle,
1143                                           struct inode *inode,
1144                                           struct buffer_head *dir_block,
1145                                           void *buf,
1146                                           int inline_size)
1147 {
1148         int err, csum_size = 0, header_size = 0;
1149         struct ext4_dir_entry_2 *de;
1150         struct ext4_dir_entry_tail *t;
1151         void *target = dir_block->b_data;
1152
1153         /*
1154          * First create "." and ".." and then copy the dir information
1155          * back to the block.
1156          */
1157         de = (struct ext4_dir_entry_2 *)target;
1158         de = ext4_init_dot_dotdot(inode, de,
1159                 inode->i_sb->s_blocksize, csum_size,
1160                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1161         header_size = (void *)de - target;
1162
1163         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1164                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1165
1166         if (ext4_has_metadata_csum(inode->i_sb))
1167                 csum_size = sizeof(struct ext4_dir_entry_tail);
1168
1169         inode->i_size = inode->i_sb->s_blocksize;
1170         i_size_write(inode, inode->i_sb->s_blocksize);
1171         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1172         ext4_update_final_de(dir_block->b_data,
1173                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1174                         inode->i_sb->s_blocksize - csum_size);
1175
1176         if (csum_size) {
1177                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1178                                      inode->i_sb->s_blocksize);
1179                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1180         }
1181         set_buffer_uptodate(dir_block);
1182         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1183         if (err)
1184                 return err;
1185         set_buffer_verified(dir_block);
1186         return ext4_mark_inode_dirty(handle, inode);
1187 }
1188
1189 static int ext4_convert_inline_data_nolock(handle_t *handle,
1190                                            struct inode *inode,
1191                                            struct ext4_iloc *iloc)
1192 {
1193         int error;
1194         void *buf = NULL;
1195         struct buffer_head *data_bh = NULL;
1196         struct ext4_map_blocks map;
1197         int inline_size;
1198
1199         inline_size = ext4_get_inline_size(inode);
1200         buf = kmalloc(inline_size, GFP_NOFS);
1201         if (!buf) {
1202                 error = -ENOMEM;
1203                 goto out;
1204         }
1205
1206         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1207         if (error < 0)
1208                 goto out;
1209
1210         /*
1211          * Make sure the inline directory entries pass checks before we try to
1212          * convert them, so that we avoid touching stuff that needs fsck.
1213          */
1214         if (S_ISDIR(inode->i_mode)) {
1215                 error = ext4_check_all_de(inode, iloc->bh,
1216                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1217                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1218                 if (error)
1219                         goto out;
1220         }
1221
1222         error = ext4_destroy_inline_data_nolock(handle, inode);
1223         if (error)
1224                 goto out;
1225
1226         map.m_lblk = 0;
1227         map.m_len = 1;
1228         map.m_flags = 0;
1229         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1230         if (error < 0)
1231                 goto out_restore;
1232         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1233                 error = -EIO;
1234                 goto out_restore;
1235         }
1236
1237         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1238         if (!data_bh) {
1239                 error = -ENOMEM;
1240                 goto out_restore;
1241         }
1242
1243         lock_buffer(data_bh);
1244         error = ext4_journal_get_create_access(handle, data_bh);
1245         if (error) {
1246                 unlock_buffer(data_bh);
1247                 error = -EIO;
1248                 goto out_restore;
1249         }
1250         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1251
1252         if (!S_ISDIR(inode->i_mode)) {
1253                 memcpy(data_bh->b_data, buf, inline_size);
1254                 set_buffer_uptodate(data_bh);
1255                 error = ext4_handle_dirty_metadata(handle,
1256                                                    inode, data_bh);
1257         } else {
1258                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1259                                                        buf, inline_size);
1260         }
1261
1262         unlock_buffer(data_bh);
1263 out_restore:
1264         if (error)
1265                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1266
1267 out:
1268         brelse(data_bh);
1269         kfree(buf);
1270         return error;
1271 }
1272
1273 /*
1274  * Try to add the new entry to the inline data.
1275  * If succeeds, return 0. If not, extended the inline dir and copied data to
1276  * the new created block.
1277  */
1278 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1279                               struct inode *dir, struct inode *inode)
1280 {
1281         int ret, inline_size, no_expand;
1282         void *inline_start;
1283         struct ext4_iloc iloc;
1284
1285         ret = ext4_get_inode_loc(dir, &iloc);
1286         if (ret)
1287                 return ret;
1288
1289         ext4_write_lock_xattr(dir, &no_expand);
1290         if (!ext4_has_inline_data(dir))
1291                 goto out;
1292
1293         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1294                                                  EXT4_INLINE_DOTDOT_SIZE;
1295         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1296
1297         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1298                                         inline_start, inline_size);
1299         if (ret != -ENOSPC)
1300                 goto out;
1301
1302         /* check whether it can be inserted to inline xattr space. */
1303         inline_size = EXT4_I(dir)->i_inline_size -
1304                         EXT4_MIN_INLINE_DATA_SIZE;
1305         if (!inline_size) {
1306                 /* Try to use the xattr space.*/
1307                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1308                 if (ret && ret != -ENOSPC)
1309                         goto out;
1310
1311                 inline_size = EXT4_I(dir)->i_inline_size -
1312                                 EXT4_MIN_INLINE_DATA_SIZE;
1313         }
1314
1315         if (inline_size) {
1316                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1317
1318                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1319                                                 inode, &iloc, inline_start,
1320                                                 inline_size);
1321
1322                 if (ret != -ENOSPC)
1323                         goto out;
1324         }
1325
1326         /*
1327          * The inline space is filled up, so create a new block for it.
1328          * As the extent tree will be created, we have to save the inline
1329          * dir first.
1330          */
1331         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1332
1333 out:
1334         ext4_mark_inode_dirty(handle, dir);
1335         ext4_write_unlock_xattr(dir, &no_expand);
1336         brelse(iloc.bh);
1337         return ret;
1338 }
1339
1340 /*
1341  * This function fills a red-black tree with information from an
1342  * inlined dir.  It returns the number directory entries loaded
1343  * into the tree.  If there is an error it is returned in err.
1344  */
1345 int htree_inlinedir_to_tree(struct file *dir_file,
1346                             struct inode *dir, ext4_lblk_t block,
1347                             struct dx_hash_info *hinfo,
1348                             __u32 start_hash, __u32 start_minor_hash,
1349                             int *has_inline_data)
1350 {
1351         int err = 0, count = 0;
1352         unsigned int parent_ino;
1353         int pos;
1354         struct ext4_dir_entry_2 *de;
1355         struct inode *inode = file_inode(dir_file);
1356         int ret, inline_size = 0;
1357         struct ext4_iloc iloc;
1358         void *dir_buf = NULL;
1359         struct ext4_dir_entry_2 fake;
1360         struct fscrypt_str tmp_str;
1361
1362         ret = ext4_get_inode_loc(inode, &iloc);
1363         if (ret)
1364                 return ret;
1365
1366         down_read(&EXT4_I(inode)->xattr_sem);
1367         if (!ext4_has_inline_data(inode)) {
1368                 up_read(&EXT4_I(inode)->xattr_sem);
1369                 *has_inline_data = 0;
1370                 goto out;
1371         }
1372
1373         inline_size = ext4_get_inline_size(inode);
1374         dir_buf = kmalloc(inline_size, GFP_NOFS);
1375         if (!dir_buf) {
1376                 ret = -ENOMEM;
1377                 up_read(&EXT4_I(inode)->xattr_sem);
1378                 goto out;
1379         }
1380
1381         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1382         up_read(&EXT4_I(inode)->xattr_sem);
1383         if (ret < 0)
1384                 goto out;
1385
1386         pos = 0;
1387         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1388         while (pos < inline_size) {
1389                 /*
1390                  * As inlined dir doesn't store any information about '.' and
1391                  * only the inode number of '..' is stored, we have to handle
1392                  * them differently.
1393                  */
1394                 if (pos == 0) {
1395                         fake.inode = cpu_to_le32(inode->i_ino);
1396                         fake.name_len = 1;
1397                         strcpy(fake.name, ".");
1398                         fake.rec_len = ext4_rec_len_to_disk(
1399                                                 EXT4_DIR_REC_LEN(fake.name_len),
1400                                                 inline_size);
1401                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1402                         de = &fake;
1403                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1404                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1405                         fake.inode = cpu_to_le32(parent_ino);
1406                         fake.name_len = 2;
1407                         strcpy(fake.name, "..");
1408                         fake.rec_len = ext4_rec_len_to_disk(
1409                                                 EXT4_DIR_REC_LEN(fake.name_len),
1410                                                 inline_size);
1411                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1412                         de = &fake;
1413                         pos = EXT4_INLINE_DOTDOT_SIZE;
1414                 } else {
1415                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1416                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1417                         if (ext4_check_dir_entry(inode, dir_file, de,
1418                                          iloc.bh, dir_buf,
1419                                          inline_size, pos)) {
1420                                 ret = count;
1421                                 goto out;
1422                         }
1423                 }
1424
1425                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1426                 if ((hinfo->hash < start_hash) ||
1427                     ((hinfo->hash == start_hash) &&
1428                      (hinfo->minor_hash < start_minor_hash)))
1429                         continue;
1430                 if (de->inode == 0)
1431                         continue;
1432                 tmp_str.name = de->name;
1433                 tmp_str.len = de->name_len;
1434                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1435                                               hinfo->minor_hash, de, &tmp_str);
1436                 if (err) {
1437                         ret = err;
1438                         goto out;
1439                 }
1440                 count++;
1441         }
1442         ret = count;
1443 out:
1444         kfree(dir_buf);
1445         brelse(iloc.bh);
1446         return ret;
1447 }
1448
1449 /*
1450  * So this function is called when the volume is mkfsed with
1451  * dir_index disabled. In order to keep f_pos persistent
1452  * after we convert from an inlined dir to a blocked based,
1453  * we just pretend that we are a normal dir and return the
1454  * offset as if '.' and '..' really take place.
1455  *
1456  */
1457 int ext4_read_inline_dir(struct file *file,
1458                          struct dir_context *ctx,
1459                          int *has_inline_data)
1460 {
1461         unsigned int offset, parent_ino;
1462         int i;
1463         struct ext4_dir_entry_2 *de;
1464         struct super_block *sb;
1465         struct inode *inode = file_inode(file);
1466         int ret, inline_size = 0;
1467         struct ext4_iloc iloc;
1468         void *dir_buf = NULL;
1469         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1470
1471         ret = ext4_get_inode_loc(inode, &iloc);
1472         if (ret)
1473                 return ret;
1474
1475         down_read(&EXT4_I(inode)->xattr_sem);
1476         if (!ext4_has_inline_data(inode)) {
1477                 up_read(&EXT4_I(inode)->xattr_sem);
1478                 *has_inline_data = 0;
1479                 goto out;
1480         }
1481
1482         inline_size = ext4_get_inline_size(inode);
1483         dir_buf = kmalloc(inline_size, GFP_NOFS);
1484         if (!dir_buf) {
1485                 ret = -ENOMEM;
1486                 up_read(&EXT4_I(inode)->xattr_sem);
1487                 goto out;
1488         }
1489
1490         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1491         up_read(&EXT4_I(inode)->xattr_sem);
1492         if (ret < 0)
1493                 goto out;
1494
1495         ret = 0;
1496         sb = inode->i_sb;
1497         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1498         offset = ctx->pos;
1499
1500         /*
1501          * dotdot_offset and dotdot_size is the real offset and
1502          * size for ".." and "." if the dir is block based while
1503          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1504          * So we will use extra_offset and extra_size to indicate them
1505          * during the inline dir iteration.
1506          */
1507         dotdot_offset = EXT4_DIR_REC_LEN(1);
1508         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1509         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1510         extra_size = extra_offset + inline_size;
1511
1512         /*
1513          * If the version has changed since the last call to
1514          * readdir(2), then we might be pointing to an invalid
1515          * dirent right now.  Scan from the start of the inline
1516          * dir to make sure.
1517          */
1518         if (file->f_version != inode->i_version) {
1519                 for (i = 0; i < extra_size && i < offset;) {
1520                         /*
1521                          * "." is with offset 0 and
1522                          * ".." is dotdot_offset.
1523                          */
1524                         if (!i) {
1525                                 i = dotdot_offset;
1526                                 continue;
1527                         } else if (i == dotdot_offset) {
1528                                 i = dotdot_size;
1529                                 continue;
1530                         }
1531                         /* for other entry, the real offset in
1532                          * the buf has to be tuned accordingly.
1533                          */
1534                         de = (struct ext4_dir_entry_2 *)
1535                                 (dir_buf + i - extra_offset);
1536                         /* It's too expensive to do a full
1537                          * dirent test each time round this
1538                          * loop, but we do have to test at
1539                          * least that it is non-zero.  A
1540                          * failure will be detected in the
1541                          * dirent test below. */
1542                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1543                                 < EXT4_DIR_REC_LEN(1))
1544                                 break;
1545                         i += ext4_rec_len_from_disk(de->rec_len,
1546                                                     extra_size);
1547                 }
1548                 offset = i;
1549                 ctx->pos = offset;
1550                 file->f_version = inode->i_version;
1551         }
1552
1553         while (ctx->pos < extra_size) {
1554                 if (ctx->pos == 0) {
1555                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1556                                 goto out;
1557                         ctx->pos = dotdot_offset;
1558                         continue;
1559                 }
1560
1561                 if (ctx->pos == dotdot_offset) {
1562                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1563                                 goto out;
1564                         ctx->pos = dotdot_size;
1565                         continue;
1566                 }
1567
1568                 de = (struct ext4_dir_entry_2 *)
1569                         (dir_buf + ctx->pos - extra_offset);
1570                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1571                                          extra_size, ctx->pos))
1572                         goto out;
1573                 if (le32_to_cpu(de->inode)) {
1574                         if (!dir_emit(ctx, de->name, de->name_len,
1575                                       le32_to_cpu(de->inode),
1576                                       get_dtype(sb, de->file_type)))
1577                                 goto out;
1578                 }
1579                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1580         }
1581 out:
1582         kfree(dir_buf);
1583         brelse(iloc.bh);
1584         return ret;
1585 }
1586
1587 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1588                                         struct ext4_dir_entry_2 **parent_de,
1589                                         int *retval)
1590 {
1591         struct ext4_iloc iloc;
1592
1593         *retval = ext4_get_inode_loc(inode, &iloc);
1594         if (*retval)
1595                 return NULL;
1596
1597         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1598
1599         return iloc.bh;
1600 }
1601
1602 /*
1603  * Try to create the inline data for the new dir.
1604  * If it succeeds, return 0, otherwise return the error.
1605  * In case of ENOSPC, the caller should create the normal disk layout dir.
1606  */
1607 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1608                                struct inode *inode)
1609 {
1610         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1611         struct ext4_iloc iloc;
1612         struct ext4_dir_entry_2 *de;
1613
1614         ret = ext4_get_inode_loc(inode, &iloc);
1615         if (ret)
1616                 return ret;
1617
1618         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1619         if (ret)
1620                 goto out;
1621
1622         /*
1623          * For inline dir, we only save the inode information for the ".."
1624          * and create a fake dentry to cover the left space.
1625          */
1626         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1627         de->inode = cpu_to_le32(parent->i_ino);
1628         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1629         de->inode = 0;
1630         de->rec_len = ext4_rec_len_to_disk(
1631                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1632                                 inline_size);
1633         set_nlink(inode, 2);
1634         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1635 out:
1636         brelse(iloc.bh);
1637         return ret;
1638 }
1639
1640 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1641                                         struct ext4_filename *fname,
1642                                         const struct qstr *d_name,
1643                                         struct ext4_dir_entry_2 **res_dir,
1644                                         int *has_inline_data)
1645 {
1646         int ret;
1647         struct ext4_iloc iloc;
1648         void *inline_start;
1649         int inline_size;
1650
1651         if (ext4_get_inode_loc(dir, &iloc))
1652                 return NULL;
1653
1654         down_read(&EXT4_I(dir)->xattr_sem);
1655         if (!ext4_has_inline_data(dir)) {
1656                 *has_inline_data = 0;
1657                 goto out;
1658         }
1659
1660         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1661                                                 EXT4_INLINE_DOTDOT_SIZE;
1662         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1663         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1664                               dir, fname, d_name, 0, res_dir);
1665         if (ret == 1)
1666                 goto out_find;
1667         if (ret < 0)
1668                 goto out;
1669
1670         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1671                 goto out;
1672
1673         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1674         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1675
1676         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1677                               dir, fname, d_name, 0, res_dir);
1678         if (ret == 1)
1679                 goto out_find;
1680
1681 out:
1682         brelse(iloc.bh);
1683         iloc.bh = NULL;
1684 out_find:
1685         up_read(&EXT4_I(dir)->xattr_sem);
1686         return iloc.bh;
1687 }
1688
1689 int ext4_delete_inline_entry(handle_t *handle,
1690                              struct inode *dir,
1691                              struct ext4_dir_entry_2 *de_del,
1692                              struct buffer_head *bh,
1693                              int *has_inline_data)
1694 {
1695         int err, inline_size, no_expand;
1696         struct ext4_iloc iloc;
1697         void *inline_start;
1698
1699         err = ext4_get_inode_loc(dir, &iloc);
1700         if (err)
1701                 return err;
1702
1703         ext4_write_lock_xattr(dir, &no_expand);
1704         if (!ext4_has_inline_data(dir)) {
1705                 *has_inline_data = 0;
1706                 goto out;
1707         }
1708
1709         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1710                 EXT4_MIN_INLINE_DATA_SIZE) {
1711                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1712                                         EXT4_INLINE_DOTDOT_SIZE;
1713                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1714                                 EXT4_INLINE_DOTDOT_SIZE;
1715         } else {
1716                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1717                 inline_size = ext4_get_inline_size(dir) -
1718                                 EXT4_MIN_INLINE_DATA_SIZE;
1719         }
1720
1721         BUFFER_TRACE(bh, "get_write_access");
1722         err = ext4_journal_get_write_access(handle, bh);
1723         if (err)
1724                 goto out;
1725
1726         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1727                                         inline_start, inline_size, 0);
1728         if (err)
1729                 goto out;
1730
1731         err = ext4_mark_inode_dirty(handle, dir);
1732         if (unlikely(err))
1733                 goto out;
1734
1735         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1736 out:
1737         ext4_write_unlock_xattr(dir, &no_expand);
1738         brelse(iloc.bh);
1739         if (err != -ENOENT)
1740                 ext4_std_error(dir->i_sb, err);
1741         return err;
1742 }
1743
1744 /*
1745  * Get the inline dentry at offset.
1746  */
1747 static inline struct ext4_dir_entry_2 *
1748 ext4_get_inline_entry(struct inode *inode,
1749                       struct ext4_iloc *iloc,
1750                       unsigned int offset,
1751                       void **inline_start,
1752                       int *inline_size)
1753 {
1754         void *inline_pos;
1755
1756         BUG_ON(offset > ext4_get_inline_size(inode));
1757
1758         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1759                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1760                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1761         } else {
1762                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1763                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1764                 *inline_size = ext4_get_inline_size(inode) -
1765                                 EXT4_MIN_INLINE_DATA_SIZE;
1766         }
1767
1768         if (inline_start)
1769                 *inline_start = inline_pos;
1770         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1771 }
1772
1773 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1774 {
1775         int err, inline_size;
1776         struct ext4_iloc iloc;
1777         size_t inline_len;
1778         void *inline_pos;
1779         unsigned int offset;
1780         struct ext4_dir_entry_2 *de;
1781         bool ret = true;
1782
1783         err = ext4_get_inode_loc(dir, &iloc);
1784         if (err) {
1785                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1786                                  err, dir->i_ino);
1787                 return true;
1788         }
1789
1790         down_read(&EXT4_I(dir)->xattr_sem);
1791         if (!ext4_has_inline_data(dir)) {
1792                 *has_inline_data = 0;
1793                 goto out;
1794         }
1795
1796         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1797         if (!le32_to_cpu(de->inode)) {
1798                 ext4_warning(dir->i_sb,
1799                              "bad inline directory (dir #%lu) - no `..'",
1800                              dir->i_ino);
1801                 ret = true;
1802                 goto out;
1803         }
1804
1805         inline_len = ext4_get_inline_size(dir);
1806         offset = EXT4_INLINE_DOTDOT_SIZE;
1807         while (offset < inline_len) {
1808                 de = ext4_get_inline_entry(dir, &iloc, offset,
1809                                            &inline_pos, &inline_size);
1810                 if (ext4_check_dir_entry(dir, NULL, de,
1811                                          iloc.bh, inline_pos,
1812                                          inline_size, offset)) {
1813                         ext4_warning(dir->i_sb,
1814                                      "bad inline directory (dir #%lu) - "
1815                                      "inode %u, rec_len %u, name_len %d"
1816                                      "inline size %d",
1817                                      dir->i_ino, le32_to_cpu(de->inode),
1818                                      le16_to_cpu(de->rec_len), de->name_len,
1819                                      inline_size);
1820                         ret = true;
1821                         goto out;
1822                 }
1823                 if (le32_to_cpu(de->inode)) {
1824                         ret = false;
1825                         goto out;
1826                 }
1827                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1828         }
1829
1830 out:
1831         up_read(&EXT4_I(dir)->xattr_sem);
1832         brelse(iloc.bh);
1833         return ret;
1834 }
1835
1836 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1837 {
1838         int ret, no_expand;
1839
1840         ext4_write_lock_xattr(inode, &no_expand);
1841         ret = ext4_destroy_inline_data_nolock(handle, inode);
1842         ext4_write_unlock_xattr(inode, &no_expand);
1843
1844         return ret;
1845 }
1846
1847 int ext4_inline_data_fiemap(struct inode *inode,
1848                             struct fiemap_extent_info *fieinfo,
1849                             int *has_inline, __u64 start, __u64 len)
1850 {
1851         __u64 physical = 0;
1852         __u64 inline_len;
1853         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1854                 FIEMAP_EXTENT_LAST;
1855         int error = 0;
1856         struct ext4_iloc iloc;
1857
1858         down_read(&EXT4_I(inode)->xattr_sem);
1859         if (!ext4_has_inline_data(inode)) {
1860                 *has_inline = 0;
1861                 goto out;
1862         }
1863         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1864                            i_size_read(inode));
1865         if (start >= inline_len)
1866                 goto out;
1867         if (start + len < inline_len)
1868                 inline_len = start + len;
1869         inline_len -= start;
1870
1871         error = ext4_get_inode_loc(inode, &iloc);
1872         if (error)
1873                 goto out;
1874
1875         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1876         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1877         physical += offsetof(struct ext4_inode, i_block);
1878
1879         brelse(iloc.bh);
1880 out:
1881         up_read(&EXT4_I(inode)->xattr_sem);
1882         if (physical)
1883                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1884                                                 inline_len, flags);
1885         return (error < 0 ? error : 0);
1886 }
1887
1888 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1889 {
1890         handle_t *handle;
1891         int inline_size, value_len, needed_blocks, no_expand;
1892         size_t i_size;
1893         void *value = NULL;
1894         struct ext4_xattr_ibody_find is = {
1895                 .s = { .not_found = -ENODATA, },
1896         };
1897         struct ext4_xattr_info i = {
1898                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1899                 .name = EXT4_XATTR_SYSTEM_DATA,
1900         };
1901
1902
1903         needed_blocks = ext4_writepage_trans_blocks(inode);
1904         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1905         if (IS_ERR(handle))
1906                 return;
1907
1908         ext4_write_lock_xattr(inode, &no_expand);
1909         if (!ext4_has_inline_data(inode)) {
1910                 ext4_write_unlock_xattr(inode, &no_expand);
1911                 *has_inline = 0;
1912                 ext4_journal_stop(handle);
1913                 return;
1914         }
1915
1916         if (ext4_orphan_add(handle, inode))
1917                 goto out;
1918
1919         if (ext4_get_inode_loc(inode, &is.iloc))
1920                 goto out;
1921
1922         down_write(&EXT4_I(inode)->i_data_sem);
1923         i_size = inode->i_size;
1924         inline_size = ext4_get_inline_size(inode);
1925         EXT4_I(inode)->i_disksize = i_size;
1926
1927         if (i_size < inline_size) {
1928                 /* Clear the content in the xattr space. */
1929                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1930                         if (ext4_xattr_ibody_find(inode, &i, &is))
1931                                 goto out_error;
1932
1933                         BUG_ON(is.s.not_found);
1934
1935                         value_len = le32_to_cpu(is.s.here->e_value_size);
1936                         value = kmalloc(value_len, GFP_NOFS);
1937                         if (!value)
1938                                 goto out_error;
1939
1940                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1941                                                 value, value_len))
1942                                 goto out_error;
1943
1944                         i.value = value;
1945                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1946                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1947                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1948                                 goto out_error;
1949                 }
1950
1951                 /* Clear the content within i_blocks. */
1952                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1953                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1954                         memset(p + i_size, 0,
1955                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1956                 }
1957
1958                 EXT4_I(inode)->i_inline_size = i_size <
1959                                         EXT4_MIN_INLINE_DATA_SIZE ?
1960                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1961         }
1962
1963 out_error:
1964         up_write(&EXT4_I(inode)->i_data_sem);
1965 out:
1966         brelse(is.iloc.bh);
1967         ext4_write_unlock_xattr(inode, &no_expand);
1968         kfree(value);
1969         if (inode->i_nlink)
1970                 ext4_orphan_del(handle, inode);
1971
1972         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1973         ext4_mark_inode_dirty(handle, inode);
1974         if (IS_SYNC(inode))
1975                 ext4_handle_sync(handle);
1976
1977         ext4_journal_stop(handle);
1978         return;
1979 }
1980
1981 int ext4_convert_inline_data(struct inode *inode)
1982 {
1983         int error, needed_blocks, no_expand;
1984         handle_t *handle;
1985         struct ext4_iloc iloc;
1986
1987         if (!ext4_has_inline_data(inode)) {
1988                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1989                 return 0;
1990         } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1991                 /*
1992                  * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
1993                  * cleared. This means we are in the middle of moving of
1994                  * inline data to delay allocated block. Just force writeout
1995                  * here to finish conversion.
1996                  */
1997                 error = filemap_flush(inode->i_mapping);
1998                 if (error)
1999                         return error;
2000                 if (!ext4_has_inline_data(inode))
2001                         return 0;
2002         }
2003
2004         needed_blocks = ext4_writepage_trans_blocks(inode);
2005
2006         iloc.bh = NULL;
2007         error = ext4_get_inode_loc(inode, &iloc);
2008         if (error)
2009                 return error;
2010
2011         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2012         if (IS_ERR(handle)) {
2013                 error = PTR_ERR(handle);
2014                 goto out_free;
2015         }
2016
2017         ext4_write_lock_xattr(inode, &no_expand);
2018         if (ext4_has_inline_data(inode))
2019                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2020         ext4_write_unlock_xattr(inode, &no_expand);
2021         ext4_journal_stop(handle);
2022 out_free:
2023         brelse(iloc.bh);
2024         return error;
2025 }