fs/ext4/inline.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (c) 2012 Taobao.
   4  * Written by Tao Ma <boyu.mt@taobao.com>
   5  */
   6
   7 #include <linux/iomap.h>
   8 #include <linux/fiemap.h>
   9 #include <linux/iversion.h>
  10
  11 #include "ext4_jbd2.h"
  12 #include "ext4.h"
  13 #include "xattr.h"
  14 #include "truncate.h"
  15
  16 #define EXT4_XATTR_SYSTEM_DATA  "data"
  17 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  18 #define EXT4_INLINE_DOTDOT_OFFSET       2
  19 #define EXT4_INLINE_DOTDOT_SIZE         4
  20
  21 static int ext4_get_inline_size(struct inode *inode)
  22 {
  23         if (EXT4_I(inode)->i_inline_off)
  24                 return EXT4_I(inode)->i_inline_size;
  25
  26         return 0;
  27 }
  28
  29 static int get_max_inline_xattr_value_size(struct inode *inode,
  30                                            struct ext4_iloc *iloc)
  31 {
  32         struct ext4_xattr_ibody_header *header;
  33         struct ext4_xattr_entry *entry;
  34         struct ext4_inode *raw_inode;
  35         int free, min_offs;
  36
  37         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  38                         EXT4_GOOD_OLD_INODE_SIZE -
  39                         EXT4_I(inode)->i_extra_isize -
  40                         sizeof(struct ext4_xattr_ibody_header);
  41
  42         /*
  43          * We need to subtract another sizeof(__u32) since an in-inode xattr
  44          * needs an empty 4 bytes to indicate the gap between the xattr entry
  45          * and the name/value pair.
  46          */
  47         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  48                 return EXT4_XATTR_SIZE(min_offs -
  49                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  50                         EXT4_XATTR_ROUND - sizeof(__u32));
  51
  52         raw_inode = ext4_raw_inode(iloc);
  53         header = IHDR(inode, raw_inode);
  54         entry = IFIRST(header);
  55
  56         /* Compute min_offs. */
  57         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  58                 if (!entry->e_value_inum && entry->e_value_size) {
  59                         size_t offs = le16_to_cpu(entry->e_value_offs);
  60                         if (offs < min_offs)
  61                                 min_offs = offs;
  62                 }
  63         }
  64         free = min_offs -
  65                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  66
  67         if (EXT4_I(inode)->i_inline_off) {
  68                 entry = (struct ext4_xattr_entry *)
  69                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  70
  71                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  72                 goto out;
  73         }
  74
  75         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  76
  77         if (free > EXT4_XATTR_ROUND)
  78                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  79         else
  80                 free = 0;
  81
  82 out:
  83         return free;
  84 }
  85
  86 /*
  87  * Get the maximum size we now can store in an inode.
  88  * If we can't find the space for a xattr entry, don't use the space
  89  * of the extents since we have no space to indicate the inline data.
  90  */
  91 int ext4_get_max_inline_size(struct inode *inode)
  92 {
  93         int error, max_inline_size;
  94         struct ext4_iloc iloc;
  95
  96         if (EXT4_I(inode)->i_extra_isize == 0)
  97                 return 0;
  98
  99         error = ext4_get_inode_loc(inode, &iloc);
 100         if (error) {
 101                 ext4_error_inode(inode, __func__, __LINE__, 0,
 102                                  "can't get inode location %lu",
 103                                  inode->i_ino);
 104                 return 0;
 105         }
 106
 107         down_read(&EXT4_I(inode)->xattr_sem);
 108         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 109         up_read(&EXT4_I(inode)->xattr_sem);
 110
 111         brelse(iloc.bh);
 112
 113         if (!max_inline_size)
 114                 return 0;
 115
 116         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 117 }
 118
 119 /*
 120  * this function does not take xattr_sem, which is OK because it is
 121  * currently only used in a code path coming form ext4_iget, before
 122  * the new inode has been unlocked
 123  */
 124 int ext4_find_inline_data_nolock(struct inode *inode)
 125 {
 126         struct ext4_xattr_ibody_find is = {
 127                 .s = { .not_found = -ENODATA, },
 128         };
 129         struct ext4_xattr_info i = {
 130                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 131                 .name = EXT4_XATTR_SYSTEM_DATA,
 132         };
 133         int error;
 134
 135         if (EXT4_I(inode)->i_extra_isize == 0)
 136                 return 0;
 137
 138         error = ext4_get_inode_loc(inode, &is.iloc);
 139         if (error)
 140                 return error;
 141
 142         error = ext4_xattr_ibody_find(inode, &i, &is);
 143         if (error)
 144                 goto out;
 145
 146         if (!is.s.not_found) {
 147                 if (is.s.here->e_value_inum) {
 148                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 149                                          "to an external xattr inode");
 150                         error = -EFSCORRUPTED;
 151                         goto out;
 152                 }
 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         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 219                 return;
 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
 441         if (ext4_has_feature_extents(inode->i_sb)) {
 442                 if (S_ISDIR(inode->i_mode) ||
 443                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 444                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 445                         ext4_ext_tree_init(handle, inode);
 446                 }
 447         }
 448         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 449
 450         get_bh(is.iloc.bh);
 451         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 452
 453         EXT4_I(inode)->i_inline_off = 0;
 454         EXT4_I(inode)->i_inline_size = 0;
 455         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 456 out:
 457         brelse(is.iloc.bh);
 458         if (error == -ENODATA)
 459                 error = 0;
 460         return error;
 461 }
 462
 463 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 464 {
 465         void *kaddr;
 466         int ret = 0;
 467         size_t len;
 468         struct ext4_iloc iloc;
 469
 470         BUG_ON(!PageLocked(page));
 471         BUG_ON(!ext4_has_inline_data(inode));
 472         BUG_ON(page->index);
 473
 474         if (!EXT4_I(inode)->i_inline_off) {
 475                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 476                              inode->i_ino);
 477                 goto out;
 478         }
 479
 480         ret = ext4_get_inode_loc(inode, &iloc);
 481         if (ret)
 482                 goto out;
 483
 484         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 485         kaddr = kmap_atomic(page);
 486         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 487         flush_dcache_page(page);
 488         kunmap_atomic(kaddr);
 489         zero_user_segment(page, len, PAGE_SIZE);
 490         SetPageUptodate(page);
 491         brelse(iloc.bh);
 492
 493 out:
 494         return ret;
 495 }
 496
 497 int ext4_readpage_inline(struct inode *inode, struct page *page)
 498 {
 499         int ret = 0;
 500
 501         down_read(&EXT4_I(inode)->xattr_sem);
 502         if (!ext4_has_inline_data(inode)) {
 503                 up_read(&EXT4_I(inode)->xattr_sem);
 504                 return -EAGAIN;
 505         }
 506
 507         /*
 508          * Current inline data can only exist in the 1st page,
 509          * So for all the other pages, just set them uptodate.
 510          */
 511         if (!page->index)
 512                 ret = ext4_read_inline_page(inode, page);
 513         else if (!PageUptodate(page)) {
 514                 zero_user_segment(page, 0, PAGE_SIZE);
 515                 SetPageUptodate(page);
 516         }
 517
 518         up_read(&EXT4_I(inode)->xattr_sem);
 519
 520         unlock_page(page);
 521         return ret >= 0 ? 0 : ret;
 522 }
 523
 524 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 525                                               struct inode *inode,
 526                                               unsigned flags)
 527 {
 528         int ret, needed_blocks, no_expand;
 529         handle_t *handle = NULL;
 530         int retries = 0, sem_held = 0;
 531         struct page *page = NULL;
 532         unsigned from, to;
 533         struct ext4_iloc iloc;
 534
 535         if (!ext4_has_inline_data(inode)) {
 536                 /*
 537                  * clear the flag so that no new write
 538                  * will trap here again.
 539                  */
 540                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 541                 return 0;
 542         }
 543
 544         needed_blocks = ext4_writepage_trans_blocks(inode);
 545
 546         ret = ext4_get_inode_loc(inode, &iloc);
 547         if (ret)
 548                 return ret;
 549
 550 retry:
 551         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 552         if (IS_ERR(handle)) {
 553                 ret = PTR_ERR(handle);
 554                 handle = NULL;
 555                 goto out;
 556         }
 557
 558         /* We cannot recurse into the filesystem as the transaction is already
 559          * started */
 560         flags |= AOP_FLAG_NOFS;
 561
 562         page = grab_cache_page_write_begin(mapping, 0, flags);
 563         if (!page) {
 564                 ret = -ENOMEM;
 565                 goto out;
 566         }
 567
 568         ext4_write_lock_xattr(inode, &no_expand);
 569         sem_held = 1;
 570         /* If some one has already done this for us, just exit. */
 571         if (!ext4_has_inline_data(inode)) {
 572                 ret = 0;
 573                 goto out;
 574         }
 575
 576         from = 0;
 577         to = ext4_get_inline_size(inode);
 578         if (!PageUptodate(page)) {
 579                 ret = ext4_read_inline_page(inode, page);
 580                 if (ret < 0)
 581                         goto out;
 582         }
 583
 584         ret = ext4_destroy_inline_data_nolock(handle, inode);
 585         if (ret)
 586                 goto out;
 587
 588         if (ext4_should_dioread_nolock(inode)) {
 589                 ret = __block_write_begin(page, from, to,
 590                                           ext4_get_block_unwritten);
 591         } else
 592                 ret = __block_write_begin(page, from, to, ext4_get_block);
 593
 594         if (!ret && ext4_should_journal_data(inode)) {
 595                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 596                                              from, to, NULL,
 597                                              do_journal_get_write_access);
 598         }
 599
 600         if (ret) {
 601                 unlock_page(page);
 602                 put_page(page);
 603                 page = NULL;
 604                 ext4_orphan_add(handle, inode);
 605                 ext4_write_unlock_xattr(inode, &no_expand);
 606                 sem_held = 0;
 607                 ext4_journal_stop(handle);
 608                 handle = NULL;
 609                 ext4_truncate_failed_write(inode);
 610                 /*
 611                  * If truncate failed early the inode might
 612                  * still be on the orphan list; we need to
 613                  * make sure the inode is removed from the
 614                  * orphan list in that case.
 615                  */
 616                 if (inode->i_nlink)
 617                         ext4_orphan_del(NULL, inode);
 618         }
 619
 620         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 621                 goto retry;
 622
 623         if (page)
 624                 block_commit_write(page, from, to);
 625 out:
 626         if (page) {
 627                 unlock_page(page);
 628                 put_page(page);
 629         }
 630         if (sem_held)
 631                 ext4_write_unlock_xattr(inode, &no_expand);
 632         if (handle)
 633                 ext4_journal_stop(handle);
 634         brelse(iloc.bh);
 635         return ret;
 636 }
 637
 638 /*
 639  * Try to write data in the inode.
 640  * If the inode has inline data, check whether the new write can be
 641  * in the inode also. If not, create the page the handle, move the data
 642  * to the page make it update and let the later codes create extent for it.
 643  */
 644 int ext4_try_to_write_inline_data(struct address_space *mapping,
 645                                   struct inode *inode,
 646                                   loff_t pos, unsigned len,
 647                                   unsigned flags,
 648                                   struct page **pagep)
 649 {
 650         int ret;
 651         handle_t *handle;
 652         struct page *page;
 653         struct ext4_iloc iloc;
 654
 655         if (pos + len > ext4_get_max_inline_size(inode))
 656                 goto convert;
 657
 658         ret = ext4_get_inode_loc(inode, &iloc);
 659         if (ret)
 660                 return ret;
 661
 662         /*
 663          * The possible write could happen in the inode,
 664          * so try to reserve the space in inode first.
 665          */
 666         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 667         if (IS_ERR(handle)) {
 668                 ret = PTR_ERR(handle);
 669                 handle = NULL;
 670                 goto out;
 671         }
 672
 673         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 674         if (ret && ret != -ENOSPC)
 675                 goto out;
 676
 677         /* We don't have space in inline inode, so convert it to extent. */
 678         if (ret == -ENOSPC) {
 679                 ext4_journal_stop(handle);
 680                 brelse(iloc.bh);
 681                 goto convert;
 682         }
 683
 684         flags |= AOP_FLAG_NOFS;
 685
 686         page = grab_cache_page_write_begin(mapping, 0, flags);
 687         if (!page) {
 688                 ret = -ENOMEM;
 689                 goto out;
 690         }
 691
 692         *pagep = page;
 693         down_read(&EXT4_I(inode)->xattr_sem);
 694         if (!ext4_has_inline_data(inode)) {
 695                 ret = 0;
 696                 unlock_page(page);
 697                 put_page(page);
 698                 goto out_up_read;
 699         }
 700
 701         if (!PageUptodate(page)) {
 702                 ret = ext4_read_inline_page(inode, page);
 703                 if (ret < 0)
 704                         goto out_up_read;
 705         }
 706
 707         ret = 1;
 708         handle = NULL;
 709 out_up_read:
 710         up_read(&EXT4_I(inode)->xattr_sem);
 711 out:
 712         if (handle)
 713                 ext4_journal_stop(handle);
 714         brelse(iloc.bh);
 715         return ret;
 716 convert:
 717         return ext4_convert_inline_data_to_extent(mapping,
 718                                                   inode, flags);
 719 }
 720
 721 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 722                                unsigned copied, struct page *page)
 723 {
 724         int ret, no_expand;
 725         void *kaddr;
 726         struct ext4_iloc iloc;
 727
 728         if (unlikely(copied < len)) {
 729                 if (!PageUptodate(page)) {
 730                         copied = 0;
 731                         goto out;
 732                 }
 733         }
 734
 735         ret = ext4_get_inode_loc(inode, &iloc);
 736         if (ret) {
 737                 ext4_std_error(inode->i_sb, ret);
 738                 copied = 0;
 739                 goto out;
 740         }
 741
 742         ext4_write_lock_xattr(inode, &no_expand);
 743         BUG_ON(!ext4_has_inline_data(inode));
 744
 745         kaddr = kmap_atomic(page);
 746         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 747         kunmap_atomic(kaddr);
 748         SetPageUptodate(page);
 749         /* clear page dirty so that writepages wouldn't work for us. */
 750         ClearPageDirty(page);
 751
 752         ext4_write_unlock_xattr(inode, &no_expand);
 753         brelse(iloc.bh);
 754 out:
 755         return copied;
 756 }
 757
 758 struct buffer_head *
 759 ext4_journalled_write_inline_data(struct inode *inode,
 760                                   unsigned len,
 761                                   struct page *page)
 762 {
 763         int ret, no_expand;
 764         void *kaddr;
 765         struct ext4_iloc iloc;
 766
 767         ret = ext4_get_inode_loc(inode, &iloc);
 768         if (ret) {
 769                 ext4_std_error(inode->i_sb, ret);
 770                 return NULL;
 771         }
 772
 773         ext4_write_lock_xattr(inode, &no_expand);
 774         kaddr = kmap_atomic(page);
 775         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 776         kunmap_atomic(kaddr);
 777         ext4_write_unlock_xattr(inode, &no_expand);
 778
 779         return iloc.bh;
 780 }
 781
 782 /*
 783  * Try to make the page cache and handle ready for the inline data case.
 784  * We can call this function in 2 cases:
 785  * 1. The inode is created and the first write exceeds inline size. We can
 786  *    clear the inode state safely.
 787  * 2. The inode has inline data, then we need to read the data, make it
 788  *    update and dirty so that ext4_da_writepages can handle it. We don't
 789  *    need to start the journal since the file's metatdata isn't changed now.
 790  */
 791 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 792                                                  struct inode *inode,
 793                                                  unsigned flags,
 794                                                  void **fsdata)
 795 {
 796         int ret = 0, inline_size;
 797         struct page *page;
 798
 799         page = grab_cache_page_write_begin(mapping, 0, flags);
 800         if (!page)
 801                 return -ENOMEM;
 802
 803         down_read(&EXT4_I(inode)->xattr_sem);
 804         if (!ext4_has_inline_data(inode)) {
 805                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 806                 goto out;
 807         }
 808
 809         inline_size = ext4_get_inline_size(inode);
 810
 811         if (!PageUptodate(page)) {
 812                 ret = ext4_read_inline_page(inode, page);
 813                 if (ret < 0)
 814                         goto out;
 815         }
 816
 817         ret = __block_write_begin(page, 0, inline_size,
 818                                   ext4_da_get_block_prep);
 819         if (ret) {
 820                 up_read(&EXT4_I(inode)->xattr_sem);
 821                 unlock_page(page);
 822                 put_page(page);
 823                 ext4_truncate_failed_write(inode);
 824                 return ret;
 825         }
 826
 827         SetPageDirty(page);
 828         SetPageUptodate(page);
 829         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 830         *fsdata = (void *)CONVERT_INLINE_DATA;
 831
 832 out:
 833         up_read(&EXT4_I(inode)->xattr_sem);
 834         if (page) {
 835                 unlock_page(page);
 836                 put_page(page);
 837         }
 838         return ret;
 839 }
 840
 841 /*
 842  * Prepare the write for the inline data.
 843  * If the the data can be written into the inode, we just read
 844  * the page and make it uptodate, and start the journal.
 845  * Otherwise read the page, makes it dirty so that it can be
 846  * handle in writepages(the i_disksize update is left to the
 847  * normal ext4_da_write_end).
 848  */
 849 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 850                                     struct inode *inode,
 851                                     loff_t pos, unsigned len,
 852                                     unsigned flags,
 853                                     struct page **pagep,
 854                                     void **fsdata)
 855 {
 856         int ret, inline_size;
 857         handle_t *handle;
 858         struct page *page;
 859         struct ext4_iloc iloc;
 860         int retries;
 861
 862         ret = ext4_get_inode_loc(inode, &iloc);
 863         if (ret)
 864                 return ret;
 865
 866 retry_journal:
 867         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 868         if (IS_ERR(handle)) {
 869                 ret = PTR_ERR(handle);
 870                 goto out;
 871         }
 872
 873         inline_size = ext4_get_max_inline_size(inode);
 874
 875         ret = -ENOSPC;
 876         if (inline_size >= pos + len) {
 877                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 878                 if (ret && ret != -ENOSPC)
 879                         goto out_journal;
 880         }
 881
 882         /*
 883          * We cannot recurse into the filesystem as the transaction
 884          * is already started.
 885          */
 886         flags |= AOP_FLAG_NOFS;
 887
 888         if (ret == -ENOSPC) {
 889                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 890                                                             inode,
 891                                                             flags,
 892                                                             fsdata);
 893                 ext4_journal_stop(handle);
 894                 if (ret == -ENOSPC &&
 895                     ext4_should_retry_alloc(inode->i_sb, &retries))
 896                         goto retry_journal;
 897                 goto out;
 898         }
 899
 900
 901         page = grab_cache_page_write_begin(mapping, 0, flags);
 902         if (!page) {
 903                 ret = -ENOMEM;
 904                 goto out_journal;
 905         }
 906
 907         down_read(&EXT4_I(inode)->xattr_sem);
 908         if (!ext4_has_inline_data(inode)) {
 909                 ret = 0;
 910                 goto out_release_page;
 911         }
 912
 913         if (!PageUptodate(page)) {
 914                 ret = ext4_read_inline_page(inode, page);
 915                 if (ret < 0)
 916                         goto out_release_page;
 917         }
 918
 919         up_read(&EXT4_I(inode)->xattr_sem);
 920         *pagep = page;
 921         brelse(iloc.bh);
 922         return 1;
 923 out_release_page:
 924         up_read(&EXT4_I(inode)->xattr_sem);
 925         unlock_page(page);
 926         put_page(page);
 927 out_journal:
 928         ext4_journal_stop(handle);
 929 out:
 930         brelse(iloc.bh);
 931         return ret;
 932 }
 933
 934 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 935                                   unsigned len, unsigned copied,
 936                                   struct page *page)
 937 {
 938         int i_size_changed = 0;
 939         int ret;
 940
 941         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 942         if (ret < 0) {
 943                 unlock_page(page);
 944                 put_page(page);
 945                 return ret;
 946         }
 947         copied = ret;
 948
 949         /*
 950          * No need to use i_size_read() here, the i_size
 951          * cannot change under us because we hold i_mutex.
 952          *
 953          * But it's important to update i_size while still holding page lock:
 954          * page writeout could otherwise come in and zero beyond i_size.
 955          */
 956         if (pos+copied > inode->i_size) {
 957                 i_size_write(inode, pos+copied);
 958                 i_size_changed = 1;
 959         }
 960         unlock_page(page);
 961         put_page(page);
 962
 963         /*
 964          * Don't mark the inode dirty under page lock. First, it unnecessarily
 965          * makes the holding time of page lock longer. Second, it forces lock
 966          * ordering of page lock and transaction start for journaling
 967          * filesystems.
 968          */
 969         if (i_size_changed)
 970                 mark_inode_dirty(inode);
 971
 972         return copied;
 973 }
 974
 975 #ifdef INLINE_DIR_DEBUG
 976 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 977                           void *inline_start, int inline_size)
 978 {
 979         int offset;
 980         unsigned short de_len;
 981         struct ext4_dir_entry_2 *de = inline_start;
 982         void *dlimit = inline_start + inline_size;
 983
 984         trace_printk("inode %lu\n", dir->i_ino);
 985         offset = 0;
 986         while ((void *)de < dlimit) {
 987                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 988                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 989                              offset, de_len, de->name_len, de->name,
 990                              de->name_len, le32_to_cpu(de->inode));
 991                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 992                                          inline_start, inline_size, offset))
 993                         BUG();
 994
 995                 offset += de_len;
 996                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 997         }
 998 }
 999 #else
1000 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1001 #endif
1002
1003 /*
1004  * Add a new entry into a inline dir.
1005  * It will return -ENOSPC if no space is available, and -EIO
1006  * and -EEXIST if directory entry already exists.
1007  */
1008 static int ext4_add_dirent_to_inline(handle_t *handle,
1009                                      struct ext4_filename *fname,
1010                                      struct inode *dir,
1011                                      struct inode *inode,
1012                                      struct ext4_iloc *iloc,
1013                                      void *inline_start, int inline_size)
1014 {
1015         int             err;
1016         struct ext4_dir_entry_2 *de;
1017
1018         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1019                                 inline_size, fname, &de);
1020         if (err)
1021                 return err;
1022
1023         BUFFER_TRACE(iloc->bh, "get_write_access");
1024         err = ext4_journal_get_write_access(handle, iloc->bh);
1025         if (err)
1026                 return err;
1027         ext4_insert_dentry(inode, de, inline_size, fname);
1028
1029         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1030
1031         /*
1032          * XXX shouldn't update any times until successful
1033          * completion of syscall, but too many callers depend
1034          * on this.
1035          *
1036          * XXX similarly, too many callers depend on
1037          * ext4_new_inode() setting the times, but error
1038          * recovery deletes the inode, so the worst that can
1039          * happen is that the times are slightly out of date
1040          * and/or different from the directory change time.
1041          */
1042         dir->i_mtime = dir->i_ctime = current_time(dir);
1043         ext4_update_dx_flag(dir);
1044         inode_inc_iversion(dir);
1045         return 1;
1046 }
1047
1048 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1049                                        struct ext4_iloc *iloc)
1050 {
1051         struct ext4_xattr_entry *entry;
1052         struct ext4_xattr_ibody_header *header;
1053
1054         BUG_ON(!EXT4_I(inode)->i_inline_off);
1055
1056         header = IHDR(inode, ext4_raw_inode(iloc));
1057         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1058                                             EXT4_I(inode)->i_inline_off);
1059
1060         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1061 }
1062
1063 /* Set the final de to cover the whole block. */
1064 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1065 {
1066         struct ext4_dir_entry_2 *de, *prev_de;
1067         void *limit;
1068         int de_len;
1069
1070         de = (struct ext4_dir_entry_2 *)de_buf;
1071         if (old_size) {
1072                 limit = de_buf + old_size;
1073                 do {
1074                         prev_de = de;
1075                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1076                         de_buf += de_len;
1077                         de = (struct ext4_dir_entry_2 *)de_buf;
1078                 } while (de_buf < limit);
1079
1080                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1081                                                         old_size, new_size);
1082         } else {
1083                 /* this is just created, so create an empty entry. */
1084                 de->inode = 0;
1085                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1086         }
1087 }
1088
1089 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1090                                   struct ext4_iloc *iloc)
1091 {
1092         int ret;
1093         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1094         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1095
1096         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1097                 return -ENOSPC;
1098
1099         ret = ext4_update_inline_data(handle, dir,
1100                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1101         if (ret)
1102                 return ret;
1103
1104         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1105                              EXT4_I(dir)->i_inline_size -
1106                                                 EXT4_MIN_INLINE_DATA_SIZE);
1107         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1108         return 0;
1109 }
1110
1111 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1112                                      struct ext4_iloc *iloc,
1113                                      void *buf, int inline_size)
1114 {
1115         ext4_create_inline_data(handle, inode, inline_size);
1116         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1117         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1118 }
1119
1120 static int ext4_finish_convert_inline_dir(handle_t *handle,
1121                                           struct inode *inode,
1122                                           struct buffer_head *dir_block,
1123                                           void *buf,
1124                                           int inline_size)
1125 {
1126         int err, csum_size = 0, header_size = 0;
1127         struct ext4_dir_entry_2 *de;
1128         struct ext4_dir_entry_tail *t;
1129         void *target = dir_block->b_data;
1130
1131         /*
1132          * First create "." and ".." and then copy the dir information
1133          * back to the block.
1134          */
1135         de = (struct ext4_dir_entry_2 *)target;
1136         de = ext4_init_dot_dotdot(inode, de,
1137                 inode->i_sb->s_blocksize, csum_size,
1138                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1139         header_size = (void *)de - target;
1140
1141         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1142                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1143
1144         if (ext4_has_metadata_csum(inode->i_sb))
1145                 csum_size = sizeof(struct ext4_dir_entry_tail);
1146
1147         inode->i_size = inode->i_sb->s_blocksize;
1148         i_size_write(inode, inode->i_sb->s_blocksize);
1149         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1150         ext4_update_final_de(dir_block->b_data,
1151                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1152                         inode->i_sb->s_blocksize - csum_size);
1153
1154         if (csum_size) {
1155                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1156                                      inode->i_sb->s_blocksize);
1157                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1158         }
1159         set_buffer_uptodate(dir_block);
1160         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1161         if (err)
1162                 return err;
1163         set_buffer_verified(dir_block);
1164         return ext4_mark_inode_dirty(handle, inode);
1165 }
1166
1167 static int ext4_convert_inline_data_nolock(handle_t *handle,
1168                                            struct inode *inode,
1169                                            struct ext4_iloc *iloc)
1170 {
1171         int error;
1172         void *buf = NULL;
1173         struct buffer_head *data_bh = NULL;
1174         struct ext4_map_blocks map;
1175         int inline_size;
1176
1177         inline_size = ext4_get_inline_size(inode);
1178         buf = kmalloc(inline_size, GFP_NOFS);
1179         if (!buf) {
1180                 error = -ENOMEM;
1181                 goto out;
1182         }
1183
1184         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1185         if (error < 0)
1186                 goto out;
1187
1188         /*
1189          * Make sure the inline directory entries pass checks before we try to
1190          * convert them, so that we avoid touching stuff that needs fsck.
1191          */
1192         if (S_ISDIR(inode->i_mode)) {
1193                 error = ext4_check_all_de(inode, iloc->bh,
1194                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1195                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1196                 if (error)
1197                         goto out;
1198         }
1199
1200         error = ext4_destroy_inline_data_nolock(handle, inode);
1201         if (error)
1202                 goto out;
1203
1204         map.m_lblk = 0;
1205         map.m_len = 1;
1206         map.m_flags = 0;
1207         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1208         if (error < 0)
1209                 goto out_restore;
1210         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1211                 error = -EIO;
1212                 goto out_restore;
1213         }
1214
1215         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1216         if (!data_bh) {
1217                 error = -ENOMEM;
1218                 goto out_restore;
1219         }
1220
1221         lock_buffer(data_bh);
1222         error = ext4_journal_get_create_access(handle, data_bh);
1223         if (error) {
1224                 unlock_buffer(data_bh);
1225                 error = -EIO;
1226                 goto out_restore;
1227         }
1228         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1229
1230         if (!S_ISDIR(inode->i_mode)) {
1231                 memcpy(data_bh->b_data, buf, inline_size);
1232                 set_buffer_uptodate(data_bh);
1233                 error = ext4_handle_dirty_metadata(handle,
1234                                                    inode, data_bh);
1235         } else {
1236                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1237                                                        buf, inline_size);
1238         }
1239
1240         unlock_buffer(data_bh);
1241 out_restore:
1242         if (error)
1243                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1244
1245 out:
1246         brelse(data_bh);
1247         kfree(buf);
1248         return error;
1249 }
1250
1251 /*
1252  * Try to add the new entry to the inline data.
1253  * If succeeds, return 0. If not, extended the inline dir and copied data to
1254  * the new created block.
1255  */
1256 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1257                               struct inode *dir, struct inode *inode)
1258 {
1259         int ret, inline_size, no_expand;
1260         void *inline_start;
1261         struct ext4_iloc iloc;
1262
1263         ret = ext4_get_inode_loc(dir, &iloc);
1264         if (ret)
1265                 return ret;
1266
1267         ext4_write_lock_xattr(dir, &no_expand);
1268         if (!ext4_has_inline_data(dir))
1269                 goto out;
1270
1271         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1272                                                  EXT4_INLINE_DOTDOT_SIZE;
1273         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1274
1275         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1276                                         inline_start, inline_size);
1277         if (ret != -ENOSPC)
1278                 goto out;
1279
1280         /* check whether it can be inserted to inline xattr space. */
1281         inline_size = EXT4_I(dir)->i_inline_size -
1282                         EXT4_MIN_INLINE_DATA_SIZE;
1283         if (!inline_size) {
1284                 /* Try to use the xattr space.*/
1285                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1286                 if (ret && ret != -ENOSPC)
1287                         goto out;
1288
1289                 inline_size = EXT4_I(dir)->i_inline_size -
1290                                 EXT4_MIN_INLINE_DATA_SIZE;
1291         }
1292
1293         if (inline_size) {
1294                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1295
1296                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1297                                                 inode, &iloc, inline_start,
1298                                                 inline_size);
1299
1300                 if (ret != -ENOSPC)
1301                         goto out;
1302         }
1303
1304         /*
1305          * The inline space is filled up, so create a new block for it.
1306          * As the extent tree will be created, we have to save the inline
1307          * dir first.
1308          */
1309         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1310
1311 out:
1312         ext4_write_unlock_xattr(dir, &no_expand);
1313         ext4_mark_inode_dirty(handle, dir);
1314         brelse(iloc.bh);
1315         return ret;
1316 }
1317
1318 /*
1319  * This function fills a red-black tree with information from an
1320  * inlined dir.  It returns the number directory entries loaded
1321  * into the tree.  If there is an error it is returned in err.
1322  */
1323 int htree_inlinedir_to_tree(struct file *dir_file,
1324                             struct inode *dir, ext4_lblk_t block,
1325                             struct dx_hash_info *hinfo,
1326                             __u32 start_hash, __u32 start_minor_hash,
1327                             int *has_inline_data)
1328 {
1329         int err = 0, count = 0;
1330         unsigned int parent_ino;
1331         int pos;
1332         struct ext4_dir_entry_2 *de;
1333         struct inode *inode = file_inode(dir_file);
1334         int ret, inline_size = 0;
1335         struct ext4_iloc iloc;
1336         void *dir_buf = NULL;
1337         struct ext4_dir_entry_2 fake;
1338         struct fscrypt_str tmp_str;
1339
1340         ret = ext4_get_inode_loc(inode, &iloc);
1341         if (ret)
1342                 return ret;
1343
1344         down_read(&EXT4_I(inode)->xattr_sem);
1345         if (!ext4_has_inline_data(inode)) {
1346                 up_read(&EXT4_I(inode)->xattr_sem);
1347                 *has_inline_data = 0;
1348                 goto out;
1349         }
1350
1351         inline_size = ext4_get_inline_size(inode);
1352         dir_buf = kmalloc(inline_size, GFP_NOFS);
1353         if (!dir_buf) {
1354                 ret = -ENOMEM;
1355                 up_read(&EXT4_I(inode)->xattr_sem);
1356                 goto out;
1357         }
1358
1359         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1360         up_read(&EXT4_I(inode)->xattr_sem);
1361         if (ret < 0)
1362                 goto out;
1363
1364         pos = 0;
1365         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1366         while (pos < inline_size) {
1367                 /*
1368                  * As inlined dir doesn't store any information about '.' and
1369                  * only the inode number of '..' is stored, we have to handle
1370                  * them differently.
1371                  */
1372                 if (pos == 0) {
1373                         fake.inode = cpu_to_le32(inode->i_ino);
1374                         fake.name_len = 1;
1375                         strcpy(fake.name, ".");
1376                         fake.rec_len = ext4_rec_len_to_disk(
1377                                                 EXT4_DIR_REC_LEN(fake.name_len),
1378                                                 inline_size);
1379                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1380                         de = &fake;
1381                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1382                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1383                         fake.inode = cpu_to_le32(parent_ino);
1384                         fake.name_len = 2;
1385                         strcpy(fake.name, "..");
1386                         fake.rec_len = ext4_rec_len_to_disk(
1387                                                 EXT4_DIR_REC_LEN(fake.name_len),
1388                                                 inline_size);
1389                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1390                         de = &fake;
1391                         pos = EXT4_INLINE_DOTDOT_SIZE;
1392                 } else {
1393                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1394                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1395                         if (ext4_check_dir_entry(inode, dir_file, de,
1396                                          iloc.bh, dir_buf,
1397                                          inline_size, pos)) {
1398                                 ret = count;
1399                                 goto out;
1400                         }
1401                 }
1402
1403                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1404                 if ((hinfo->hash < start_hash) ||
1405                     ((hinfo->hash == start_hash) &&
1406                      (hinfo->minor_hash < start_minor_hash)))
1407                         continue;
1408                 if (de->inode == 0)
1409                         continue;
1410                 tmp_str.name = de->name;
1411                 tmp_str.len = de->name_len;
1412                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1413                                               hinfo->minor_hash, de, &tmp_str);
1414                 if (err) {
1415                         count = err;
1416                         goto out;
1417                 }
1418                 count++;
1419         }
1420         ret = count;
1421 out:
1422         kfree(dir_buf);
1423         brelse(iloc.bh);
1424         return ret;
1425 }
1426
1427 /*
1428  * So this function is called when the volume is mkfsed with
1429  * dir_index disabled. In order to keep f_pos persistent
1430  * after we convert from an inlined dir to a blocked based,
1431  * we just pretend that we are a normal dir and return the
1432  * offset as if '.' and '..' really take place.
1433  *
1434  */
1435 int ext4_read_inline_dir(struct file *file,
1436                          struct dir_context *ctx,
1437                          int *has_inline_data)
1438 {
1439         unsigned int offset, parent_ino;
1440         int i;
1441         struct ext4_dir_entry_2 *de;
1442         struct super_block *sb;
1443         struct inode *inode = file_inode(file);
1444         int ret, inline_size = 0;
1445         struct ext4_iloc iloc;
1446         void *dir_buf = NULL;
1447         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1448
1449         ret = ext4_get_inode_loc(inode, &iloc);
1450         if (ret)
1451                 return ret;
1452
1453         down_read(&EXT4_I(inode)->xattr_sem);
1454         if (!ext4_has_inline_data(inode)) {
1455                 up_read(&EXT4_I(inode)->xattr_sem);
1456                 *has_inline_data = 0;
1457                 goto out;
1458         }
1459
1460         inline_size = ext4_get_inline_size(inode);
1461         dir_buf = kmalloc(inline_size, GFP_NOFS);
1462         if (!dir_buf) {
1463                 ret = -ENOMEM;
1464                 up_read(&EXT4_I(inode)->xattr_sem);
1465                 goto out;
1466         }
1467
1468         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1469         up_read(&EXT4_I(inode)->xattr_sem);
1470         if (ret < 0)
1471                 goto out;
1472
1473         ret = 0;
1474         sb = inode->i_sb;
1475         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1476         offset = ctx->pos;
1477
1478         /*
1479          * dotdot_offset and dotdot_size is the real offset and
1480          * size for ".." and "." if the dir is block based while
1481          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1482          * So we will use extra_offset and extra_size to indicate them
1483          * during the inline dir iteration.
1484          */
1485         dotdot_offset = EXT4_DIR_REC_LEN(1);
1486         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1487         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1488         extra_size = extra_offset + inline_size;
1489
1490         /*
1491          * If the version has changed since the last call to
1492          * readdir(2), then we might be pointing to an invalid
1493          * dirent right now.  Scan from the start of the inline
1494          * dir to make sure.
1495          */
1496         if (!inode_eq_iversion(inode, file->f_version)) {
1497                 for (i = 0; i < extra_size && i < offset;) {
1498                         /*
1499                          * "." is with offset 0 and
1500                          * ".." is dotdot_offset.
1501                          */
1502                         if (!i) {
1503                                 i = dotdot_offset;
1504                                 continue;
1505                         } else if (i == dotdot_offset) {
1506                                 i = dotdot_size;
1507                                 continue;
1508                         }
1509                         /* for other entry, the real offset in
1510                          * the buf has to be tuned accordingly.
1511                          */
1512                         de = (struct ext4_dir_entry_2 *)
1513                                 (dir_buf + i - extra_offset);
1514                         /* It's too expensive to do a full
1515                          * dirent test each time round this
1516                          * loop, but we do have to test at
1517                          * least that it is non-zero.  A
1518                          * failure will be detected in the
1519                          * dirent test below. */
1520                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1521                                 < EXT4_DIR_REC_LEN(1))
1522                                 break;
1523                         i += ext4_rec_len_from_disk(de->rec_len,
1524                                                     extra_size);
1525                 }
1526                 offset = i;
1527                 ctx->pos = offset;
1528                 file->f_version = inode_query_iversion(inode);
1529         }
1530
1531         while (ctx->pos < extra_size) {
1532                 if (ctx->pos == 0) {
1533                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1534                                 goto out;
1535                         ctx->pos = dotdot_offset;
1536                         continue;
1537                 }
1538
1539                 if (ctx->pos == dotdot_offset) {
1540                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1541                                 goto out;
1542                         ctx->pos = dotdot_size;
1543                         continue;
1544                 }
1545
1546                 de = (struct ext4_dir_entry_2 *)
1547                         (dir_buf + ctx->pos - extra_offset);
1548                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1549                                          extra_size, ctx->pos))
1550                         goto out;
1551                 if (le32_to_cpu(de->inode)) {
1552                         if (!dir_emit(ctx, de->name, de->name_len,
1553                                       le32_to_cpu(de->inode),
1554                                       get_dtype(sb, de->file_type)))
1555                                 goto out;
1556                 }
1557                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1558         }
1559 out:
1560         kfree(dir_buf);
1561         brelse(iloc.bh);
1562         return ret;
1563 }
1564
1565 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1566                                         struct ext4_dir_entry_2 **parent_de,
1567                                         int *retval)
1568 {
1569         struct ext4_iloc iloc;
1570
1571         *retval = ext4_get_inode_loc(inode, &iloc);
1572         if (*retval)
1573                 return NULL;
1574
1575         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1576
1577         return iloc.bh;
1578 }
1579
1580 /*
1581  * Try to create the inline data for the new dir.
1582  * If it succeeds, return 0, otherwise return the error.
1583  * In case of ENOSPC, the caller should create the normal disk layout dir.
1584  */
1585 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1586                                struct inode *inode)
1587 {
1588         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1589         struct ext4_iloc iloc;
1590         struct ext4_dir_entry_2 *de;
1591
1592         ret = ext4_get_inode_loc(inode, &iloc);
1593         if (ret)
1594                 return ret;
1595
1596         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1597         if (ret)
1598                 goto out;
1599
1600         /*
1601          * For inline dir, we only save the inode information for the ".."
1602          * and create a fake dentry to cover the left space.
1603          */
1604         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1605         de->inode = cpu_to_le32(parent->i_ino);
1606         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1607         de->inode = 0;
1608         de->rec_len = ext4_rec_len_to_disk(
1609                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1610                                 inline_size);
1611         set_nlink(inode, 2);
1612         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1613 out:
1614         brelse(iloc.bh);
1615         return ret;
1616 }
1617
1618 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1619                                         struct ext4_filename *fname,
1620                                         struct ext4_dir_entry_2 **res_dir,
1621                                         int *has_inline_data)
1622 {
1623         int ret;
1624         struct ext4_iloc iloc;
1625         void *inline_start;
1626         int inline_size;
1627
1628         if (ext4_get_inode_loc(dir, &iloc))
1629                 return NULL;
1630
1631         down_read(&EXT4_I(dir)->xattr_sem);
1632         if (!ext4_has_inline_data(dir)) {
1633                 *has_inline_data = 0;
1634                 goto out;
1635         }
1636
1637         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1638                                                 EXT4_INLINE_DOTDOT_SIZE;
1639         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1640         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1641                               dir, fname, 0, res_dir);
1642         if (ret == 1)
1643                 goto out_find;
1644         if (ret < 0)
1645                 goto out;
1646
1647         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1648                 goto out;
1649
1650         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1651         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1652
1653         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1654                               dir, fname, 0, res_dir);
1655         if (ret == 1)
1656                 goto out_find;
1657
1658 out:
1659         brelse(iloc.bh);
1660         iloc.bh = NULL;
1661 out_find:
1662         up_read(&EXT4_I(dir)->xattr_sem);
1663         return iloc.bh;
1664 }
1665
1666 int ext4_delete_inline_entry(handle_t *handle,
1667                              struct inode *dir,
1668                              struct ext4_dir_entry_2 *de_del,
1669                              struct buffer_head *bh,
1670                              int *has_inline_data)
1671 {
1672         int err, inline_size, no_expand;
1673         struct ext4_iloc iloc;
1674         void *inline_start;
1675
1676         err = ext4_get_inode_loc(dir, &iloc);
1677         if (err)
1678                 return err;
1679
1680         ext4_write_lock_xattr(dir, &no_expand);
1681         if (!ext4_has_inline_data(dir)) {
1682                 *has_inline_data = 0;
1683                 goto out;
1684         }
1685
1686         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1687                 EXT4_MIN_INLINE_DATA_SIZE) {
1688                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1689                                         EXT4_INLINE_DOTDOT_SIZE;
1690                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1691                                 EXT4_INLINE_DOTDOT_SIZE;
1692         } else {
1693                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1694                 inline_size = ext4_get_inline_size(dir) -
1695                                 EXT4_MIN_INLINE_DATA_SIZE;
1696         }
1697
1698         BUFFER_TRACE(bh, "get_write_access");
1699         err = ext4_journal_get_write_access(handle, bh);
1700         if (err)
1701                 goto out;
1702
1703         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1704                                         inline_start, inline_size, 0);
1705         if (err)
1706                 goto out;
1707
1708         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1709 out:
1710         ext4_write_unlock_xattr(dir, &no_expand);
1711         if (likely(err == 0))
1712                 err = ext4_mark_inode_dirty(handle, dir);
1713         brelse(iloc.bh);
1714         if (err != -ENOENT)
1715                 ext4_std_error(dir->i_sb, err);
1716         return err;
1717 }
1718
1719 /*
1720  * Get the inline dentry at offset.
1721  */
1722 static inline struct ext4_dir_entry_2 *
1723 ext4_get_inline_entry(struct inode *inode,
1724                       struct ext4_iloc *iloc,
1725                       unsigned int offset,
1726                       void **inline_start,
1727                       int *inline_size)
1728 {
1729         void *inline_pos;
1730
1731         BUG_ON(offset > ext4_get_inline_size(inode));
1732
1733         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1734                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1735                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1736         } else {
1737                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1738                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1739                 *inline_size = ext4_get_inline_size(inode) -
1740                                 EXT4_MIN_INLINE_DATA_SIZE;
1741         }
1742
1743         if (inline_start)
1744                 *inline_start = inline_pos;
1745         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1746 }
1747
1748 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1749 {
1750         int err, inline_size;
1751         struct ext4_iloc iloc;
1752         void *inline_pos;
1753         unsigned int offset;
1754         struct ext4_dir_entry_2 *de;
1755         bool ret = true;
1756
1757         err = ext4_get_inode_loc(dir, &iloc);
1758         if (err) {
1759                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1760                                  err, dir->i_ino);
1761                 return true;
1762         }
1763
1764         down_read(&EXT4_I(dir)->xattr_sem);
1765         if (!ext4_has_inline_data(dir)) {
1766                 *has_inline_data = 0;
1767                 goto out;
1768         }
1769
1770         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1771         if (!le32_to_cpu(de->inode)) {
1772                 ext4_warning(dir->i_sb,
1773                              "bad inline directory (dir #%lu) - no `..'",
1774                              dir->i_ino);
1775                 ret = true;
1776                 goto out;
1777         }
1778
1779         offset = EXT4_INLINE_DOTDOT_SIZE;
1780         while (offset < dir->i_size) {
1781                 de = ext4_get_inline_entry(dir, &iloc, offset,
1782                                            &inline_pos, &inline_size);
1783                 if (ext4_check_dir_entry(dir, NULL, de,
1784                                          iloc.bh, inline_pos,
1785                                          inline_size, offset)) {
1786                         ext4_warning(dir->i_sb,
1787                                      "bad inline directory (dir #%lu) - "
1788                                      "inode %u, rec_len %u, name_len %d"
1789                                      "inline size %d",
1790                                      dir->i_ino, le32_to_cpu(de->inode),
1791                                      le16_to_cpu(de->rec_len), de->name_len,
1792                                      inline_size);
1793                         ret = true;
1794                         goto out;
1795                 }
1796                 if (le32_to_cpu(de->inode)) {
1797                         ret = false;
1798                         goto out;
1799                 }
1800                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1801         }
1802
1803 out:
1804         up_read(&EXT4_I(dir)->xattr_sem);
1805         brelse(iloc.bh);
1806         return ret;
1807 }
1808
1809 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1810 {
1811         int ret, no_expand;
1812
1813         ext4_write_lock_xattr(inode, &no_expand);
1814         ret = ext4_destroy_inline_data_nolock(handle, inode);
1815         ext4_write_unlock_xattr(inode, &no_expand);
1816
1817         return ret;
1818 }
1819
1820 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1821 {
1822         __u64 addr;
1823         int error = -EAGAIN;
1824         struct ext4_iloc iloc;
1825
1826         down_read(&EXT4_I(inode)->xattr_sem);
1827         if (!ext4_has_inline_data(inode))
1828                 goto out;
1829
1830         error = ext4_get_inode_loc(inode, &iloc);
1831         if (error)
1832                 goto out;
1833
1834         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1835         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1836         addr += offsetof(struct ext4_inode, i_block);
1837
1838         brelse(iloc.bh);
1839
1840         iomap->addr = addr;
1841         iomap->offset = 0;
1842         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1843                               i_size_read(inode));
1844         iomap->type = IOMAP_INLINE;
1845         iomap->flags = 0;
1846
1847 out:
1848         up_read(&EXT4_I(inode)->xattr_sem);
1849         return error;
1850 }
1851
1852 int ext4_inline_data_fiemap(struct inode *inode,
1853                             struct fiemap_extent_info *fieinfo,
1854                             int *has_inline, __u64 start, __u64 len)
1855 {
1856         __u64 physical = 0;
1857         __u64 inline_len;
1858         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1859                 FIEMAP_EXTENT_LAST;
1860         int error = 0;
1861         struct ext4_iloc iloc;
1862
1863         down_read(&EXT4_I(inode)->xattr_sem);
1864         if (!ext4_has_inline_data(inode)) {
1865                 *has_inline = 0;
1866                 goto out;
1867         }
1868         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1869                            i_size_read(inode));
1870         if (start >= inline_len)
1871                 goto out;
1872         if (start + len < inline_len)
1873                 inline_len = start + len;
1874         inline_len -= start;
1875
1876         error = ext4_get_inode_loc(inode, &iloc);
1877         if (error)
1878                 goto out;
1879
1880         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1881         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1882         physical += offsetof(struct ext4_inode, i_block);
1883
1884         if (physical)
1885                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1886                                                 inline_len, flags);
1887         brelse(iloc.bh);
1888 out:
1889         up_read(&EXT4_I(inode)->xattr_sem);
1890         return (error < 0 ? error : 0);
1891 }
1892
1893 /*
1894  * Called during xattr set, and if we can sparse space 'needed',
1895  * just create the extent tree evict the data to the outer block.
1896  *
1897  * We use jbd2 instead of page cache to move data to the 1st block
1898  * so that the whole transaction can be committed as a whole and
1899  * the data isn't lost because of the delayed page cache write.
1900  */
1901 int ext4_try_to_evict_inline_data(handle_t *handle,
1902                                   struct inode *inode,
1903                                   int needed)
1904 {
1905         int error;
1906         struct ext4_xattr_entry *entry;
1907         struct ext4_inode *raw_inode;
1908         struct ext4_iloc iloc;
1909
1910         error = ext4_get_inode_loc(inode, &iloc);
1911         if (error)
1912                 return error;
1913
1914         raw_inode = ext4_raw_inode(&iloc);
1915         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1916                                             EXT4_I(inode)->i_inline_off);
1917         if (EXT4_XATTR_LEN(entry->e_name_len) +
1918             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1919                 error = -ENOSPC;
1920                 goto out;
1921         }
1922
1923         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1924 out:
1925         brelse(iloc.bh);
1926         return error;
1927 }
1928
1929 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1930 {
1931         handle_t *handle;
1932         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1933         size_t i_size;
1934         void *value = NULL;
1935         struct ext4_xattr_ibody_find is = {
1936                 .s = { .not_found = -ENODATA, },
1937         };
1938         struct ext4_xattr_info i = {
1939                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1940                 .name = EXT4_XATTR_SYSTEM_DATA,
1941         };
1942
1943
1944         needed_blocks = ext4_writepage_trans_blocks(inode);
1945         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1946         if (IS_ERR(handle))
1947                 return PTR_ERR(handle);
1948
1949         ext4_write_lock_xattr(inode, &no_expand);
1950         if (!ext4_has_inline_data(inode)) {
1951                 *has_inline = 0;
1952                 ext4_journal_stop(handle);
1953                 return 0;
1954         }
1955
1956         if ((err = ext4_orphan_add(handle, inode)) != 0)
1957                 goto out;
1958
1959         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1960                 goto out;
1961
1962         down_write(&EXT4_I(inode)->i_data_sem);
1963         i_size = inode->i_size;
1964         inline_size = ext4_get_inline_size(inode);
1965         EXT4_I(inode)->i_disksize = i_size;
1966
1967         if (i_size < inline_size) {
1968                 /* Clear the content in the xattr space. */
1969                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1970                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1971                                 goto out_error;
1972
1973                         BUG_ON(is.s.not_found);
1974
1975                         value_len = le32_to_cpu(is.s.here->e_value_size);
1976                         value = kmalloc(value_len, GFP_NOFS);
1977                         if (!value) {
1978                                 err = -ENOMEM;
1979                                 goto out_error;
1980                         }
1981
1982                         err = ext4_xattr_ibody_get(inode, i.name_index,
1983                                                    i.name, value, value_len);
1984                         if (err <= 0)
1985                                 goto out_error;
1986
1987                         i.value = value;
1988                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1989                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1990                         err = ext4_xattr_ibody_inline_set(handle, inode,
1991                                                           &i, &is);
1992                         if (err)
1993                                 goto out_error;
1994                 }
1995
1996                 /* Clear the content within i_blocks. */
1997                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1998                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1999                         memset(p + i_size, 0,
2000                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
2001                 }
2002
2003                 EXT4_I(inode)->i_inline_size = i_size <
2004                                         EXT4_MIN_INLINE_DATA_SIZE ?
2005                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
2006         }
2007
2008 out_error:
2009         up_write(&EXT4_I(inode)->i_data_sem);
2010 out:
2011         brelse(is.iloc.bh);
2012         ext4_write_unlock_xattr(inode, &no_expand);
2013         kfree(value);
2014         if (inode->i_nlink)
2015                 ext4_orphan_del(handle, inode);
2016
2017         if (err == 0) {
2018                 inode->i_mtime = inode->i_ctime = current_time(inode);
2019                 err = ext4_mark_inode_dirty(handle, inode);
2020                 if (IS_SYNC(inode))
2021                         ext4_handle_sync(handle);
2022         }
2023         ext4_journal_stop(handle);
2024         return err;
2025 }
2026
2027 int ext4_convert_inline_data(struct inode *inode)
2028 {
2029         int error, needed_blocks, no_expand;
2030         handle_t *handle;
2031         struct ext4_iloc iloc;
2032
2033         if (!ext4_has_inline_data(inode)) {
2034                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2035                 return 0;
2036         }
2037
2038         needed_blocks = ext4_writepage_trans_blocks(inode);
2039
2040         iloc.bh = NULL;
2041         error = ext4_get_inode_loc(inode, &iloc);
2042         if (error)
2043                 return error;
2044
2045         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2046         if (IS_ERR(handle)) {
2047                 error = PTR_ERR(handle);
2048                 goto out_free;
2049         }
2050
2051         ext4_write_lock_xattr(inode, &no_expand);
2052         if (ext4_has_inline_data(inode))
2053                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2054         ext4_write_unlock_xattr(inode, &no_expand);
2055         ext4_journal_stop(handle);
2056 out_free:
2057         brelse(iloc.bh);
2058         return error;
2059 }