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_set_errno(inode->i_sb, -error);
 102                 ext4_error_inode(inode, __func__, __LINE__, 0,
 103                                  "can't get inode location %lu",
 104                                  inode->i_ino);
 105                 return 0;
 106         }
 107
 108         down_read(&EXT4_I(inode)->xattr_sem);
 109         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 110         up_read(&EXT4_I(inode)->xattr_sem);
 111
 112         brelse(iloc.bh);
 113
 114         if (!max_inline_size)
 115                 return 0;
 116
 117         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 118 }
 119
 120 /*
 121  * this function does not take xattr_sem, which is OK because it is
 122  * currently only used in a code path coming form ext4_iget, before
 123  * the new inode has been unlocked
 124  */
 125 int ext4_find_inline_data_nolock(struct inode *inode)
 126 {
 127         struct ext4_xattr_ibody_find is = {
 128                 .s = { .not_found = -ENODATA, },
 129         };
 130         struct ext4_xattr_info i = {
 131                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 132                 .name = EXT4_XATTR_SYSTEM_DATA,
 133         };
 134         int error;
 135
 136         if (EXT4_I(inode)->i_extra_isize == 0)
 137                 return 0;
 138
 139         error = ext4_get_inode_loc(inode, &is.iloc);
 140         if (error)
 141                 return error;
 142
 143         error = ext4_xattr_ibody_find(inode, &i, &is);
 144         if (error)
 145                 goto out;
 146
 147         if (!is.s.not_found) {
 148                 if (is.s.here->e_value_inum) {
 149                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 150                                          "to an external xattr inode");
 151                         error = -EFSCORRUPTED;
 152                         goto out;
 153                 }
 154                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 155                                         (void *)ext4_raw_inode(&is.iloc));
 156                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 157                                 le32_to_cpu(is.s.here->e_value_size);
 158                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 159         }
 160 out:
 161         brelse(is.iloc.bh);
 162         return error;
 163 }
 164
 165 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 166                                  unsigned int len,
 167                                  struct ext4_iloc *iloc)
 168 {
 169         struct ext4_xattr_entry *entry;
 170         struct ext4_xattr_ibody_header *header;
 171         int cp_len = 0;
 172         struct ext4_inode *raw_inode;
 173
 174         if (!len)
 175                 return 0;
 176
 177         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 178
 179         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 180                         len : EXT4_MIN_INLINE_DATA_SIZE;
 181
 182         raw_inode = ext4_raw_inode(iloc);
 183         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 184
 185         len -= cp_len;
 186         buffer += cp_len;
 187
 188         if (!len)
 189                 goto out;
 190
 191         header = IHDR(inode, raw_inode);
 192         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 193                                             EXT4_I(inode)->i_inline_off);
 194         len = min_t(unsigned int, len,
 195                     (unsigned int)le32_to_cpu(entry->e_value_size));
 196
 197         memcpy(buffer,
 198                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 199         cp_len += len;
 200
 201 out:
 202         return cp_len;
 203 }
 204
 205 /*
 206  * write the buffer to the inline inode.
 207  * If 'create' is set, we don't need to do the extra copy in the xattr
 208  * value since it is already handled by ext4_xattr_ibody_inline_set.
 209  * That saves us one memcpy.
 210  */
 211 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 212                                    void *buffer, loff_t pos, unsigned int len)
 213 {
 214         struct ext4_xattr_entry *entry;
 215         struct ext4_xattr_ibody_header *header;
 216         struct ext4_inode *raw_inode;
 217         int cp_len = 0;
 218
 219         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 220                 return;
 221
 222         BUG_ON(!EXT4_I(inode)->i_inline_off);
 223         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 224
 225         raw_inode = ext4_raw_inode(iloc);
 226         buffer += pos;
 227
 228         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 229                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 230                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 231                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 232
 233                 len -= cp_len;
 234                 buffer += cp_len;
 235                 pos += cp_len;
 236         }
 237
 238         if (!len)
 239                 return;
 240
 241         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 242         header = IHDR(inode, raw_inode);
 243         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 244                                             EXT4_I(inode)->i_inline_off);
 245
 246         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 247                buffer, len);
 248 }
 249
 250 static int ext4_create_inline_data(handle_t *handle,
 251                                    struct inode *inode, unsigned len)
 252 {
 253         int error;
 254         void *value = NULL;
 255         struct ext4_xattr_ibody_find is = {
 256                 .s = { .not_found = -ENODATA, },
 257         };
 258         struct ext4_xattr_info i = {
 259                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 260                 .name = EXT4_XATTR_SYSTEM_DATA,
 261         };
 262
 263         error = ext4_get_inode_loc(inode, &is.iloc);
 264         if (error)
 265                 return error;
 266
 267         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 268         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 269         if (error)
 270                 goto out;
 271
 272         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 273                 value = EXT4_ZERO_XATTR_VALUE;
 274                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 275         } else {
 276                 value = "";
 277                 len = 0;
 278         }
 279
 280         /* Insert the the xttr entry. */
 281         i.value = value;
 282         i.value_len = len;
 283
 284         error = ext4_xattr_ibody_find(inode, &i, &is);
 285         if (error)
 286                 goto out;
 287
 288         BUG_ON(!is.s.not_found);
 289
 290         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 291         if (error) {
 292                 if (error == -ENOSPC)
 293                         ext4_clear_inode_state(inode,
 294                                                EXT4_STATE_MAY_INLINE_DATA);
 295                 goto out;
 296         }
 297
 298         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 299                 0, EXT4_MIN_INLINE_DATA_SIZE);
 300
 301         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 302                                       (void *)ext4_raw_inode(&is.iloc));
 303         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 304         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 305         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 306         get_bh(is.iloc.bh);
 307         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 308
 309 out:
 310         brelse(is.iloc.bh);
 311         return error;
 312 }
 313
 314 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 315                                    unsigned int len)
 316 {
 317         int error;
 318         void *value = NULL;
 319         struct ext4_xattr_ibody_find is = {
 320                 .s = { .not_found = -ENODATA, },
 321         };
 322         struct ext4_xattr_info i = {
 323                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 324                 .name = EXT4_XATTR_SYSTEM_DATA,
 325         };
 326
 327         /* If the old space is ok, write the data directly. */
 328         if (len <= EXT4_I(inode)->i_inline_size)
 329                 return 0;
 330
 331         error = ext4_get_inode_loc(inode, &is.iloc);
 332         if (error)
 333                 return error;
 334
 335         error = ext4_xattr_ibody_find(inode, &i, &is);
 336         if (error)
 337                 goto out;
 338
 339         BUG_ON(is.s.not_found);
 340
 341         len -= EXT4_MIN_INLINE_DATA_SIZE;
 342         value = kzalloc(len, GFP_NOFS);
 343         if (!value) {
 344                 error = -ENOMEM;
 345                 goto out;
 346         }
 347
 348         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 349                                      value, len);
 350         if (error == -ENODATA)
 351                 goto out;
 352
 353         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 354         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 355         if (error)
 356                 goto out;
 357
 358         /* Update the xttr entry. */
 359         i.value = value;
 360         i.value_len = len;
 361
 362         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 363         if (error)
 364                 goto out;
 365
 366         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 367                                       (void *)ext4_raw_inode(&is.iloc));
 368         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 369                                 le32_to_cpu(is.s.here->e_value_size);
 370         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 371         get_bh(is.iloc.bh);
 372         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 373
 374 out:
 375         kfree(value);
 376         brelse(is.iloc.bh);
 377         return error;
 378 }
 379
 380 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 381                                     unsigned int len)
 382 {
 383         int ret, size, no_expand;
 384         struct ext4_inode_info *ei = EXT4_I(inode);
 385
 386         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 387                 return -ENOSPC;
 388
 389         size = ext4_get_max_inline_size(inode);
 390         if (size < len)
 391                 return -ENOSPC;
 392
 393         ext4_write_lock_xattr(inode, &no_expand);
 394
 395         if (ei->i_inline_off)
 396                 ret = ext4_update_inline_data(handle, inode, len);
 397         else
 398                 ret = ext4_create_inline_data(handle, inode, len);
 399
 400         ext4_write_unlock_xattr(inode, &no_expand);
 401         return ret;
 402 }
 403
 404 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 405                                            struct inode *inode)
 406 {
 407         struct ext4_inode_info *ei = EXT4_I(inode);
 408         struct ext4_xattr_ibody_find is = {
 409                 .s = { .not_found = 0, },
 410         };
 411         struct ext4_xattr_info i = {
 412                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 413                 .name = EXT4_XATTR_SYSTEM_DATA,
 414                 .value = NULL,
 415                 .value_len = 0,
 416         };
 417         int error;
 418
 419         if (!ei->i_inline_off)
 420                 return 0;
 421
 422         error = ext4_get_inode_loc(inode, &is.iloc);
 423         if (error)
 424                 return error;
 425
 426         error = ext4_xattr_ibody_find(inode, &i, &is);
 427         if (error)
 428                 goto out;
 429
 430         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 431         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 432         if (error)
 433                 goto out;
 434
 435         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 436         if (error)
 437                 goto out;
 438
 439         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 440                 0, EXT4_MIN_INLINE_DATA_SIZE);
 441         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 442
 443         if (ext4_has_feature_extents(inode->i_sb)) {
 444                 if (S_ISDIR(inode->i_mode) ||
 445                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 446                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 447                         ext4_ext_tree_init(handle, inode);
 448                 }
 449         }
 450         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 451
 452         get_bh(is.iloc.bh);
 453         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 454
 455         EXT4_I(inode)->i_inline_off = 0;
 456         EXT4_I(inode)->i_inline_size = 0;
 457         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 458 out:
 459         brelse(is.iloc.bh);
 460         if (error == -ENODATA)
 461                 error = 0;
 462         return error;
 463 }
 464
 465 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 466 {
 467         void *kaddr;
 468         int ret = 0;
 469         size_t len;
 470         struct ext4_iloc iloc;
 471
 472         BUG_ON(!PageLocked(page));
 473         BUG_ON(!ext4_has_inline_data(inode));
 474         BUG_ON(page->index);
 475
 476         if (!EXT4_I(inode)->i_inline_off) {
 477                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 478                              inode->i_ino);
 479                 goto out;
 480         }
 481
 482         ret = ext4_get_inode_loc(inode, &iloc);
 483         if (ret)
 484                 goto out;
 485
 486         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 487         kaddr = kmap_atomic(page);
 488         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 489         flush_dcache_page(page);
 490         kunmap_atomic(kaddr);
 491         zero_user_segment(page, len, PAGE_SIZE);
 492         SetPageUptodate(page);
 493         brelse(iloc.bh);
 494
 495 out:
 496         return ret;
 497 }
 498
 499 int ext4_readpage_inline(struct inode *inode, struct page *page)
 500 {
 501         int ret = 0;
 502
 503         down_read(&EXT4_I(inode)->xattr_sem);
 504         if (!ext4_has_inline_data(inode)) {
 505                 up_read(&EXT4_I(inode)->xattr_sem);
 506                 return -EAGAIN;
 507         }
 508
 509         /*
 510          * Current inline data can only exist in the 1st page,
 511          * So for all the other pages, just set them uptodate.
 512          */
 513         if (!page->index)
 514                 ret = ext4_read_inline_page(inode, page);
 515         else if (!PageUptodate(page)) {
 516                 zero_user_segment(page, 0, PAGE_SIZE);
 517                 SetPageUptodate(page);
 518         }
 519
 520         up_read(&EXT4_I(inode)->xattr_sem);
 521
 522         unlock_page(page);
 523         return ret >= 0 ? 0 : ret;
 524 }
 525
 526 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 527                                               struct inode *inode,
 528                                               unsigned flags)
 529 {
 530         int ret, needed_blocks, no_expand;
 531         handle_t *handle = NULL;
 532         int retries = 0, sem_held = 0;
 533         struct page *page = NULL;
 534         unsigned from, to;
 535         struct ext4_iloc iloc;
 536
 537         if (!ext4_has_inline_data(inode)) {
 538                 /*
 539                  * clear the flag so that no new write
 540                  * will trap here again.
 541                  */
 542                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 543                 return 0;
 544         }
 545
 546         needed_blocks = ext4_writepage_trans_blocks(inode);
 547
 548         ret = ext4_get_inode_loc(inode, &iloc);
 549         if (ret)
 550                 return ret;
 551
 552 retry:
 553         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 554         if (IS_ERR(handle)) {
 555                 ret = PTR_ERR(handle);
 556                 handle = NULL;
 557                 goto out;
 558         }
 559
 560         /* We cannot recurse into the filesystem as the transaction is already
 561          * started */
 562         flags |= AOP_FLAG_NOFS;
 563
 564         page = grab_cache_page_write_begin(mapping, 0, flags);
 565         if (!page) {
 566                 ret = -ENOMEM;
 567                 goto out;
 568         }
 569
 570         ext4_write_lock_xattr(inode, &no_expand);
 571         sem_held = 1;
 572         /* If some one has already done this for us, just exit. */
 573         if (!ext4_has_inline_data(inode)) {
 574                 ret = 0;
 575                 goto out;
 576         }
 577
 578         from = 0;
 579         to = ext4_get_inline_size(inode);
 580         if (!PageUptodate(page)) {
 581                 ret = ext4_read_inline_page(inode, page);
 582                 if (ret < 0)
 583                         goto out;
 584         }
 585
 586         ret = ext4_destroy_inline_data_nolock(handle, inode);
 587         if (ret)
 588                 goto out;
 589
 590         if (ext4_should_dioread_nolock(inode)) {
 591                 ret = __block_write_begin(page, from, to,
 592                                           ext4_get_block_unwritten);
 593         } else
 594                 ret = __block_write_begin(page, from, to, ext4_get_block);
 595
 596         if (!ret && ext4_should_journal_data(inode)) {
 597                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 598                                              from, to, NULL,
 599                                              do_journal_get_write_access);
 600         }
 601
 602         if (ret) {
 603                 unlock_page(page);
 604                 put_page(page);
 605                 page = NULL;
 606                 ext4_orphan_add(handle, inode);
 607                 ext4_write_unlock_xattr(inode, &no_expand);
 608                 sem_held = 0;
 609                 ext4_journal_stop(handle);
 610                 handle = NULL;
 611                 ext4_truncate_failed_write(inode);
 612                 /*
 613                  * If truncate failed early the inode might
 614                  * still be on the orphan list; we need to
 615                  * make sure the inode is removed from the
 616                  * orphan list in that case.
 617                  */
 618                 if (inode->i_nlink)
 619                         ext4_orphan_del(NULL, inode);
 620         }
 621
 622         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 623                 goto retry;
 624
 625         if (page)
 626                 block_commit_write(page, from, to);
 627 out:
 628         if (page) {
 629                 unlock_page(page);
 630                 put_page(page);
 631         }
 632         if (sem_held)
 633                 ext4_write_unlock_xattr(inode, &no_expand);
 634         if (handle)
 635                 ext4_journal_stop(handle);
 636         brelse(iloc.bh);
 637         return ret;
 638 }
 639
 640 /*
 641  * Try to write data in the inode.
 642  * If the inode has inline data, check whether the new write can be
 643  * in the inode also. If not, create the page the handle, move the data
 644  * to the page make it update and let the later codes create extent for it.
 645  */
 646 int ext4_try_to_write_inline_data(struct address_space *mapping,
 647                                   struct inode *inode,
 648                                   loff_t pos, unsigned len,
 649                                   unsigned flags,
 650                                   struct page **pagep)
 651 {
 652         int ret;
 653         handle_t *handle;
 654         struct page *page;
 655         struct ext4_iloc iloc;
 656
 657         if (pos + len > ext4_get_max_inline_size(inode))
 658                 goto convert;
 659
 660         ret = ext4_get_inode_loc(inode, &iloc);
 661         if (ret)
 662                 return ret;
 663
 664         /*
 665          * The possible write could happen in the inode,
 666          * so try to reserve the space in inode first.
 667          */
 668         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 669         if (IS_ERR(handle)) {
 670                 ret = PTR_ERR(handle);
 671                 handle = NULL;
 672                 goto out;
 673         }
 674
 675         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 676         if (ret && ret != -ENOSPC)
 677                 goto out;
 678
 679         /* We don't have space in inline inode, so convert it to extent. */
 680         if (ret == -ENOSPC) {
 681                 ext4_journal_stop(handle);
 682                 brelse(iloc.bh);
 683                 goto convert;
 684         }
 685
 686         ret = ext4_journal_get_write_access(handle, iloc.bh);
 687         if (ret)
 688                 goto out;
 689
 690         flags |= AOP_FLAG_NOFS;
 691
 692         page = grab_cache_page_write_begin(mapping, 0, flags);
 693         if (!page) {
 694                 ret = -ENOMEM;
 695                 goto out;
 696         }
 697
 698         *pagep = page;
 699         down_read(&EXT4_I(inode)->xattr_sem);
 700         if (!ext4_has_inline_data(inode)) {
 701                 ret = 0;
 702                 unlock_page(page);
 703                 put_page(page);
 704                 goto out_up_read;
 705         }
 706
 707         if (!PageUptodate(page)) {
 708                 ret = ext4_read_inline_page(inode, page);
 709                 if (ret < 0) {
 710                         unlock_page(page);
 711                         put_page(page);
 712                         goto out_up_read;
 713                 }
 714         }
 715
 716         ret = 1;
 717         handle = NULL;
 718 out_up_read:
 719         up_read(&EXT4_I(inode)->xattr_sem);
 720 out:
 721         if (handle && (ret != 1))
 722                 ext4_journal_stop(handle);
 723         brelse(iloc.bh);
 724         return ret;
 725 convert:
 726         return ext4_convert_inline_data_to_extent(mapping,
 727                                                   inode, flags);
 728 }
 729
 730 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 731                                unsigned copied, struct page *page)
 732 {
 733         int ret, no_expand;
 734         void *kaddr;
 735         struct ext4_iloc iloc;
 736
 737         if (unlikely(copied < len)) {
 738                 if (!PageUptodate(page)) {
 739                         copied = 0;
 740                         goto out;
 741                 }
 742         }
 743
 744         ret = ext4_get_inode_loc(inode, &iloc);
 745         if (ret) {
 746                 ext4_std_error(inode->i_sb, ret);
 747                 copied = 0;
 748                 goto out;
 749         }
 750
 751         ext4_write_lock_xattr(inode, &no_expand);
 752         BUG_ON(!ext4_has_inline_data(inode));
 753
 754         kaddr = kmap_atomic(page);
 755         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 756         kunmap_atomic(kaddr);
 757         SetPageUptodate(page);
 758         /* clear page dirty so that writepages wouldn't work for us. */
 759         ClearPageDirty(page);
 760
 761         ext4_write_unlock_xattr(inode, &no_expand);
 762         brelse(iloc.bh);
 763         mark_inode_dirty(inode);
 764 out:
 765         return copied;
 766 }
 767
 768 struct buffer_head *
 769 ext4_journalled_write_inline_data(struct inode *inode,
 770                                   unsigned len,
 771                                   struct page *page)
 772 {
 773         int ret, no_expand;
 774         void *kaddr;
 775         struct ext4_iloc iloc;
 776
 777         ret = ext4_get_inode_loc(inode, &iloc);
 778         if (ret) {
 779                 ext4_std_error(inode->i_sb, ret);
 780                 return NULL;
 781         }
 782
 783         ext4_write_lock_xattr(inode, &no_expand);
 784         kaddr = kmap_atomic(page);
 785         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 786         kunmap_atomic(kaddr);
 787         ext4_write_unlock_xattr(inode, &no_expand);
 788
 789         return iloc.bh;
 790 }
 791
 792 /*
 793  * Try to make the page cache and handle ready for the inline data case.
 794  * We can call this function in 2 cases:
 795  * 1. The inode is created and the first write exceeds inline size. We can
 796  *    clear the inode state safely.
 797  * 2. The inode has inline data, then we need to read the data, make it
 798  *    update and dirty so that ext4_da_writepages can handle it. We don't
 799  *    need to start the journal since the file's metatdata isn't changed now.
 800  */
 801 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 802                                                  struct inode *inode,
 803                                                  unsigned flags,
 804                                                  void **fsdata)
 805 {
 806         int ret = 0, inline_size;
 807         struct page *page;
 808
 809         page = grab_cache_page_write_begin(mapping, 0, flags);
 810         if (!page)
 811                 return -ENOMEM;
 812
 813         down_read(&EXT4_I(inode)->xattr_sem);
 814         if (!ext4_has_inline_data(inode)) {
 815                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 816                 goto out;
 817         }
 818
 819         inline_size = ext4_get_inline_size(inode);
 820
 821         if (!PageUptodate(page)) {
 822                 ret = ext4_read_inline_page(inode, page);
 823                 if (ret < 0)
 824                         goto out;
 825         }
 826
 827         ret = __block_write_begin(page, 0, inline_size,
 828                                   ext4_da_get_block_prep);
 829         if (ret) {
 830                 up_read(&EXT4_I(inode)->xattr_sem);
 831                 unlock_page(page);
 832                 put_page(page);
 833                 ext4_truncate_failed_write(inode);
 834                 return ret;
 835         }
 836
 837         SetPageDirty(page);
 838         SetPageUptodate(page);
 839         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 840         *fsdata = (void *)CONVERT_INLINE_DATA;
 841
 842 out:
 843         up_read(&EXT4_I(inode)->xattr_sem);
 844         if (page) {
 845                 unlock_page(page);
 846                 put_page(page);
 847         }
 848         return ret;
 849 }
 850
 851 /*
 852  * Prepare the write for the inline data.
 853  * If the data can be written into the inode, we just read
 854  * the page and make it uptodate, and start the journal.
 855  * Otherwise read the page, makes it dirty so that it can be
 856  * handle in writepages(the i_disksize update is left to the
 857  * normal ext4_da_write_end).
 858  */
 859 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 860                                     struct inode *inode,
 861                                     loff_t pos, unsigned len,
 862                                     unsigned flags,
 863                                     struct page **pagep,
 864                                     void **fsdata)
 865 {
 866         int ret, inline_size;
 867         handle_t *handle;
 868         struct page *page;
 869         struct ext4_iloc iloc;
 870         int retries = 0;
 871
 872         ret = ext4_get_inode_loc(inode, &iloc);
 873         if (ret)
 874                 return ret;
 875
 876 retry_journal:
 877         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 878         if (IS_ERR(handle)) {
 879                 ret = PTR_ERR(handle);
 880                 goto out;
 881         }
 882
 883         inline_size = ext4_get_max_inline_size(inode);
 884
 885         ret = -ENOSPC;
 886         if (inline_size >= pos + len) {
 887                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 888                 if (ret && ret != -ENOSPC)
 889                         goto out_journal;
 890         }
 891
 892         /*
 893          * We cannot recurse into the filesystem as the transaction
 894          * is already started.
 895          */
 896         flags |= AOP_FLAG_NOFS;
 897
 898         if (ret == -ENOSPC) {
 899                 ext4_journal_stop(handle);
 900                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 901                                                             inode,
 902                                                             flags,
 903                                                             fsdata);
 904                 if (ret == -ENOSPC &&
 905                     ext4_should_retry_alloc(inode->i_sb, &retries))
 906                         goto retry_journal;
 907                 goto out;
 908         }
 909
 910         page = grab_cache_page_write_begin(mapping, 0, flags);
 911         if (!page) {
 912                 ret = -ENOMEM;
 913                 goto out_journal;
 914         }
 915
 916         down_read(&EXT4_I(inode)->xattr_sem);
 917         if (!ext4_has_inline_data(inode)) {
 918                 ret = 0;
 919                 goto out_release_page;
 920         }
 921
 922         if (!PageUptodate(page)) {
 923                 ret = ext4_read_inline_page(inode, page);
 924                 if (ret < 0)
 925                         goto out_release_page;
 926         }
 927         ret = ext4_journal_get_write_access(handle, iloc.bh);
 928         if (ret)
 929                 goto out_release_page;
 930
 931         up_read(&EXT4_I(inode)->xattr_sem);
 932         *pagep = page;
 933         brelse(iloc.bh);
 934         return 1;
 935 out_release_page:
 936         up_read(&EXT4_I(inode)->xattr_sem);
 937         unlock_page(page);
 938         put_page(page);
 939 out_journal:
 940         ext4_journal_stop(handle);
 941 out:
 942         brelse(iloc.bh);
 943         return ret;
 944 }
 945
 946 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 947                                   unsigned len, unsigned copied,
 948                                   struct page *page)
 949 {
 950         int ret;
 951
 952         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 953         if (ret < 0) {
 954                 unlock_page(page);
 955                 put_page(page);
 956                 return ret;
 957         }
 958         copied = ret;
 959
 960         /*
 961          * No need to use i_size_read() here, the i_size
 962          * cannot change under us because we hold i_mutex.
 963          *
 964          * But it's important to update i_size while still holding page lock:
 965          * page writeout could otherwise come in and zero beyond i_size.
 966          */
 967         if (pos+copied > inode->i_size)
 968                 i_size_write(inode, pos+copied);
 969         unlock_page(page);
 970         put_page(page);
 971
 972         /*
 973          * Don't mark the inode dirty under page lock. First, it unnecessarily
 974          * makes the holding time of page lock longer. Second, it forces lock
 975          * ordering of page lock and transaction start for journaling
 976          * filesystems.
 977          */
 978         mark_inode_dirty(inode);
 979
 980         return copied;
 981 }
 982
 983 #ifdef INLINE_DIR_DEBUG
 984 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 985                           void *inline_start, int inline_size)
 986 {
 987         int offset;
 988         unsigned short de_len;
 989         struct ext4_dir_entry_2 *de = inline_start;
 990         void *dlimit = inline_start + inline_size;
 991
 992         trace_printk("inode %lu\n", dir->i_ino);
 993         offset = 0;
 994         while ((void *)de < dlimit) {
 995                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 996                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 997                              offset, de_len, de->name_len, de->name,
 998                              de->name_len, le32_to_cpu(de->inode));
 999                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1000                                          inline_start, inline_size, offset))
1001                         BUG();
1002
1003                 offset += de_len;
1004                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1005         }
1006 }
1007 #else
1008 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1009 #endif
1010
1011 /*
1012  * Add a new entry into a inline dir.
1013  * It will return -ENOSPC if no space is available, and -EIO
1014  * and -EEXIST if directory entry already exists.
1015  */
1016 static int ext4_add_dirent_to_inline(handle_t *handle,
1017                                      struct ext4_filename *fname,
1018                                      struct inode *dir,
1019                                      struct inode *inode,
1020                                      struct ext4_iloc *iloc,
1021                                      void *inline_start, int inline_size)
1022 {
1023         int             err;
1024         struct ext4_dir_entry_2 *de;
1025
1026         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1027                                 inline_size, fname, &de);
1028         if (err)
1029                 return err;
1030
1031         BUFFER_TRACE(iloc->bh, "get_write_access");
1032         err = ext4_journal_get_write_access(handle, iloc->bh);
1033         if (err)
1034                 return err;
1035         ext4_insert_dentry(inode, de, inline_size, fname);
1036
1037         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1038
1039         /*
1040          * XXX shouldn't update any times until successful
1041          * completion of syscall, but too many callers depend
1042          * on this.
1043          *
1044          * XXX similarly, too many callers depend on
1045          * ext4_new_inode() setting the times, but error
1046          * recovery deletes the inode, so the worst that can
1047          * happen is that the times are slightly out of date
1048          * and/or different from the directory change time.
1049          */
1050         dir->i_mtime = dir->i_ctime = current_time(dir);
1051         ext4_update_dx_flag(dir);
1052         inode_inc_iversion(dir);
1053         return 1;
1054 }
1055
1056 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1057                                        struct ext4_iloc *iloc)
1058 {
1059         struct ext4_xattr_entry *entry;
1060         struct ext4_xattr_ibody_header *header;
1061
1062         BUG_ON(!EXT4_I(inode)->i_inline_off);
1063
1064         header = IHDR(inode, ext4_raw_inode(iloc));
1065         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1066                                             EXT4_I(inode)->i_inline_off);
1067
1068         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1069 }
1070
1071 /* Set the final de to cover the whole block. */
1072 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1073 {
1074         struct ext4_dir_entry_2 *de, *prev_de;
1075         void *limit;
1076         int de_len;
1077
1078         de = (struct ext4_dir_entry_2 *)de_buf;
1079         if (old_size) {
1080                 limit = de_buf + old_size;
1081                 do {
1082                         prev_de = de;
1083                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1084                         de_buf += de_len;
1085                         de = (struct ext4_dir_entry_2 *)de_buf;
1086                 } while (de_buf < limit);
1087
1088                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1089                                                         old_size, new_size);
1090         } else {
1091                 /* this is just created, so create an empty entry. */
1092                 de->inode = 0;
1093                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1094         }
1095 }
1096
1097 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1098                                   struct ext4_iloc *iloc)
1099 {
1100         int ret;
1101         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1102         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1103
1104         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1105                 return -ENOSPC;
1106
1107         ret = ext4_update_inline_data(handle, dir,
1108                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1109         if (ret)
1110                 return ret;
1111
1112         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1113                              EXT4_I(dir)->i_inline_size -
1114                                                 EXT4_MIN_INLINE_DATA_SIZE);
1115         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1116         return 0;
1117 }
1118
1119 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1120                                      struct ext4_iloc *iloc,
1121                                      void *buf, int inline_size)
1122 {
1123         ext4_create_inline_data(handle, inode, inline_size);
1124         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1125         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1126 }
1127
1128 static int ext4_finish_convert_inline_dir(handle_t *handle,
1129                                           struct inode *inode,
1130                                           struct buffer_head *dir_block,
1131                                           void *buf,
1132                                           int inline_size)
1133 {
1134         int err, csum_size = 0, header_size = 0;
1135         struct ext4_dir_entry_2 *de;
1136         void *target = dir_block->b_data;
1137
1138         /*
1139          * First create "." and ".." and then copy the dir information
1140          * back to the block.
1141          */
1142         de = (struct ext4_dir_entry_2 *)target;
1143         de = ext4_init_dot_dotdot(inode, de,
1144                 inode->i_sb->s_blocksize, csum_size,
1145                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1146         header_size = (void *)de - target;
1147
1148         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1149                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1150
1151         if (ext4_has_metadata_csum(inode->i_sb))
1152                 csum_size = sizeof(struct ext4_dir_entry_tail);
1153
1154         inode->i_size = inode->i_sb->s_blocksize;
1155         i_size_write(inode, inode->i_sb->s_blocksize);
1156         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1157         ext4_update_final_de(dir_block->b_data,
1158                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1159                         inode->i_sb->s_blocksize - csum_size);
1160
1161         if (csum_size)
1162                 ext4_initialize_dirent_tail(dir_block,
1163                                             inode->i_sb->s_blocksize);
1164         set_buffer_uptodate(dir_block);
1165         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1166         if (err)
1167                 return err;
1168         set_buffer_verified(dir_block);
1169         return ext4_mark_inode_dirty(handle, inode);
1170 }
1171
1172 static int ext4_convert_inline_data_nolock(handle_t *handle,
1173                                            struct inode *inode,
1174                                            struct ext4_iloc *iloc)
1175 {
1176         int error;
1177         void *buf = NULL;
1178         struct buffer_head *data_bh = NULL;
1179         struct ext4_map_blocks map;
1180         int inline_size;
1181
1182         inline_size = ext4_get_inline_size(inode);
1183         buf = kmalloc(inline_size, GFP_NOFS);
1184         if (!buf) {
1185                 error = -ENOMEM;
1186                 goto out;
1187         }
1188
1189         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1190         if (error < 0)
1191                 goto out;
1192
1193         /*
1194          * Make sure the inline directory entries pass checks before we try to
1195          * convert them, so that we avoid touching stuff that needs fsck.
1196          */
1197         if (S_ISDIR(inode->i_mode)) {
1198                 error = ext4_check_all_de(inode, iloc->bh,
1199                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1200                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1201                 if (error)
1202                         goto out;
1203         }
1204
1205         error = ext4_destroy_inline_data_nolock(handle, inode);
1206         if (error)
1207                 goto out;
1208
1209         map.m_lblk = 0;
1210         map.m_len = 1;
1211         map.m_flags = 0;
1212         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1213         if (error < 0)
1214                 goto out_restore;
1215         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1216                 error = -EIO;
1217                 goto out_restore;
1218         }
1219
1220         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1221         if (!data_bh) {
1222                 error = -ENOMEM;
1223                 goto out_restore;
1224         }
1225
1226         lock_buffer(data_bh);
1227         error = ext4_journal_get_create_access(handle, data_bh);
1228         if (error) {
1229                 unlock_buffer(data_bh);
1230                 error = -EIO;
1231                 goto out_restore;
1232         }
1233         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1234
1235         if (!S_ISDIR(inode->i_mode)) {
1236                 memcpy(data_bh->b_data, buf, inline_size);
1237                 set_buffer_uptodate(data_bh);
1238                 error = ext4_handle_dirty_metadata(handle,
1239                                                    inode, data_bh);
1240         } else {
1241                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1242                                                        buf, inline_size);
1243         }
1244
1245         unlock_buffer(data_bh);
1246 out_restore:
1247         if (error)
1248                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1249
1250 out:
1251         brelse(data_bh);
1252         kfree(buf);
1253         return error;
1254 }
1255
1256 /*
1257  * Try to add the new entry to the inline data.
1258  * If succeeds, return 0. If not, extended the inline dir and copied data to
1259  * the new created block.
1260  */
1261 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1262                               struct inode *dir, struct inode *inode)
1263 {
1264         int ret, inline_size, no_expand;
1265         void *inline_start;
1266         struct ext4_iloc iloc;
1267
1268         ret = ext4_get_inode_loc(dir, &iloc);
1269         if (ret)
1270                 return ret;
1271
1272         ext4_write_lock_xattr(dir, &no_expand);
1273         if (!ext4_has_inline_data(dir))
1274                 goto out;
1275
1276         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1277                                                  EXT4_INLINE_DOTDOT_SIZE;
1278         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1279
1280         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1281                                         inline_start, inline_size);
1282         if (ret != -ENOSPC)
1283                 goto out;
1284
1285         /* check whether it can be inserted to inline xattr space. */
1286         inline_size = EXT4_I(dir)->i_inline_size -
1287                         EXT4_MIN_INLINE_DATA_SIZE;
1288         if (!inline_size) {
1289                 /* Try to use the xattr space.*/
1290                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1291                 if (ret && ret != -ENOSPC)
1292                         goto out;
1293
1294                 inline_size = EXT4_I(dir)->i_inline_size -
1295                                 EXT4_MIN_INLINE_DATA_SIZE;
1296         }
1297
1298         if (inline_size) {
1299                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1300
1301                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1302                                                 inode, &iloc, inline_start,
1303                                                 inline_size);
1304
1305                 if (ret != -ENOSPC)
1306                         goto out;
1307         }
1308
1309         /*
1310          * The inline space is filled up, so create a new block for it.
1311          * As the extent tree will be created, we have to save the inline
1312          * dir first.
1313          */
1314         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1315
1316 out:
1317         ext4_write_unlock_xattr(dir, &no_expand);
1318         ext4_mark_inode_dirty(handle, dir);
1319         brelse(iloc.bh);
1320         return ret;
1321 }
1322
1323 /*
1324  * This function fills a red-black tree with information from an
1325  * inlined dir.  It returns the number directory entries loaded
1326  * into the tree.  If there is an error it is returned in err.
1327  */
1328 int ext4_inlinedir_to_tree(struct file *dir_file,
1329                            struct inode *dir, ext4_lblk_t block,
1330                            struct dx_hash_info *hinfo,
1331                            __u32 start_hash, __u32 start_minor_hash,
1332                            int *has_inline_data)
1333 {
1334         int err = 0, count = 0;
1335         unsigned int parent_ino;
1336         int pos;
1337         struct ext4_dir_entry_2 *de;
1338         struct inode *inode = file_inode(dir_file);
1339         int ret, inline_size = 0;
1340         struct ext4_iloc iloc;
1341         void *dir_buf = NULL;
1342         struct ext4_dir_entry_2 fake;
1343         struct fscrypt_str tmp_str;
1344
1345         ret = ext4_get_inode_loc(inode, &iloc);
1346         if (ret)
1347                 return ret;
1348
1349         down_read(&EXT4_I(inode)->xattr_sem);
1350         if (!ext4_has_inline_data(inode)) {
1351                 up_read(&EXT4_I(inode)->xattr_sem);
1352                 *has_inline_data = 0;
1353                 goto out;
1354         }
1355
1356         inline_size = ext4_get_inline_size(inode);
1357         dir_buf = kmalloc(inline_size, GFP_NOFS);
1358         if (!dir_buf) {
1359                 ret = -ENOMEM;
1360                 up_read(&EXT4_I(inode)->xattr_sem);
1361                 goto out;
1362         }
1363
1364         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1365         up_read(&EXT4_I(inode)->xattr_sem);
1366         if (ret < 0)
1367                 goto out;
1368
1369         pos = 0;
1370         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1371         while (pos < inline_size) {
1372                 /*
1373                  * As inlined dir doesn't store any information about '.' and
1374                  * only the inode number of '..' is stored, we have to handle
1375                  * them differently.
1376                  */
1377                 if (pos == 0) {
1378                         fake.inode = cpu_to_le32(inode->i_ino);
1379                         fake.name_len = 1;
1380                         strcpy(fake.name, ".");
1381                         fake.rec_len = ext4_rec_len_to_disk(
1382                                                 EXT4_DIR_REC_LEN(fake.name_len),
1383                                                 inline_size);
1384                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1385                         de = &fake;
1386                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1387                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1388                         fake.inode = cpu_to_le32(parent_ino);
1389                         fake.name_len = 2;
1390                         strcpy(fake.name, "..");
1391                         fake.rec_len = ext4_rec_len_to_disk(
1392                                                 EXT4_DIR_REC_LEN(fake.name_len),
1393                                                 inline_size);
1394                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1395                         de = &fake;
1396                         pos = EXT4_INLINE_DOTDOT_SIZE;
1397                 } else {
1398                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1399                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1400                         if (ext4_check_dir_entry(inode, dir_file, de,
1401                                          iloc.bh, dir_buf,
1402                                          inline_size, pos)) {
1403                                 ret = count;
1404                                 goto out;
1405                         }
1406                 }
1407
1408                 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1409                 if ((hinfo->hash < start_hash) ||
1410                     ((hinfo->hash == start_hash) &&
1411                      (hinfo->minor_hash < start_minor_hash)))
1412                         continue;
1413                 if (de->inode == 0)
1414                         continue;
1415                 tmp_str.name = de->name;
1416                 tmp_str.len = de->name_len;
1417                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1418                                               hinfo->minor_hash, de, &tmp_str);
1419                 if (err) {
1420                         ret = err;
1421                         goto out;
1422                 }
1423                 count++;
1424         }
1425         ret = count;
1426 out:
1427         kfree(dir_buf);
1428         brelse(iloc.bh);
1429         return ret;
1430 }
1431
1432 /*
1433  * So this function is called when the volume is mkfsed with
1434  * dir_index disabled. In order to keep f_pos persistent
1435  * after we convert from an inlined dir to a blocked based,
1436  * we just pretend that we are a normal dir and return the
1437  * offset as if '.' and '..' really take place.
1438  *
1439  */
1440 int ext4_read_inline_dir(struct file *file,
1441                          struct dir_context *ctx,
1442                          int *has_inline_data)
1443 {
1444         unsigned int offset, parent_ino;
1445         int i;
1446         struct ext4_dir_entry_2 *de;
1447         struct super_block *sb;
1448         struct inode *inode = file_inode(file);
1449         int ret, inline_size = 0;
1450         struct ext4_iloc iloc;
1451         void *dir_buf = NULL;
1452         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1453
1454         ret = ext4_get_inode_loc(inode, &iloc);
1455         if (ret)
1456                 return ret;
1457
1458         down_read(&EXT4_I(inode)->xattr_sem);
1459         if (!ext4_has_inline_data(inode)) {
1460                 up_read(&EXT4_I(inode)->xattr_sem);
1461                 *has_inline_data = 0;
1462                 goto out;
1463         }
1464
1465         inline_size = ext4_get_inline_size(inode);
1466         dir_buf = kmalloc(inline_size, GFP_NOFS);
1467         if (!dir_buf) {
1468                 ret = -ENOMEM;
1469                 up_read(&EXT4_I(inode)->xattr_sem);
1470                 goto out;
1471         }
1472
1473         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1474         up_read(&EXT4_I(inode)->xattr_sem);
1475         if (ret < 0)
1476                 goto out;
1477
1478         ret = 0;
1479         sb = inode->i_sb;
1480         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1481         offset = ctx->pos;
1482
1483         /*
1484          * dotdot_offset and dotdot_size is the real offset and
1485          * size for ".." and "." if the dir is block based while
1486          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1487          * So we will use extra_offset and extra_size to indicate them
1488          * during the inline dir iteration.
1489          */
1490         dotdot_offset = EXT4_DIR_REC_LEN(1);
1491         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1492         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1493         extra_size = extra_offset + inline_size;
1494
1495         /*
1496          * If the version has changed since the last call to
1497          * readdir(2), then we might be pointing to an invalid
1498          * dirent right now.  Scan from the start of the inline
1499          * dir to make sure.
1500          */
1501         if (!inode_eq_iversion(inode, file->f_version)) {
1502                 for (i = 0; i < extra_size && i < offset;) {
1503                         /*
1504                          * "." is with offset 0 and
1505                          * ".." is dotdot_offset.
1506                          */
1507                         if (!i) {
1508                                 i = dotdot_offset;
1509                                 continue;
1510                         } else if (i == dotdot_offset) {
1511                                 i = dotdot_size;
1512                                 continue;
1513                         }
1514                         /* for other entry, the real offset in
1515                          * the buf has to be tuned accordingly.
1516                          */
1517                         de = (struct ext4_dir_entry_2 *)
1518                                 (dir_buf + i - extra_offset);
1519                         /* It's too expensive to do a full
1520                          * dirent test each time round this
1521                          * loop, but we do have to test at
1522                          * least that it is non-zero.  A
1523                          * failure will be detected in the
1524                          * dirent test below. */
1525                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1526                                 < EXT4_DIR_REC_LEN(1))
1527                                 break;
1528                         i += ext4_rec_len_from_disk(de->rec_len,
1529                                                     extra_size);
1530                 }
1531                 offset = i;
1532                 ctx->pos = offset;
1533                 file->f_version = inode_query_iversion(inode);
1534         }
1535
1536         while (ctx->pos < extra_size) {
1537                 if (ctx->pos == 0) {
1538                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1539                                 goto out;
1540                         ctx->pos = dotdot_offset;
1541                         continue;
1542                 }
1543
1544                 if (ctx->pos == dotdot_offset) {
1545                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1546                                 goto out;
1547                         ctx->pos = dotdot_size;
1548                         continue;
1549                 }
1550
1551                 de = (struct ext4_dir_entry_2 *)
1552                         (dir_buf + ctx->pos - extra_offset);
1553                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1554                                          extra_size, ctx->pos))
1555                         goto out;
1556                 if (le32_to_cpu(de->inode)) {
1557                         if (!dir_emit(ctx, de->name, de->name_len,
1558                                       le32_to_cpu(de->inode),
1559                                       get_dtype(sb, de->file_type)))
1560                                 goto out;
1561                 }
1562                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1563         }
1564 out:
1565         kfree(dir_buf);
1566         brelse(iloc.bh);
1567         return ret;
1568 }
1569
1570 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1571                                         struct ext4_dir_entry_2 **parent_de,
1572                                         int *retval)
1573 {
1574         struct ext4_iloc iloc;
1575
1576         *retval = ext4_get_inode_loc(inode, &iloc);
1577         if (*retval)
1578                 return NULL;
1579
1580         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1581
1582         return iloc.bh;
1583 }
1584
1585 /*
1586  * Try to create the inline data for the new dir.
1587  * If it succeeds, return 0, otherwise return the error.
1588  * In case of ENOSPC, the caller should create the normal disk layout dir.
1589  */
1590 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1591                                struct inode *inode)
1592 {
1593         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1594         struct ext4_iloc iloc;
1595         struct ext4_dir_entry_2 *de;
1596
1597         ret = ext4_get_inode_loc(inode, &iloc);
1598         if (ret)
1599                 return ret;
1600
1601         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1602         if (ret)
1603                 goto out;
1604
1605         /*
1606          * For inline dir, we only save the inode information for the ".."
1607          * and create a fake dentry to cover the left space.
1608          */
1609         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1610         de->inode = cpu_to_le32(parent->i_ino);
1611         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1612         de->inode = 0;
1613         de->rec_len = ext4_rec_len_to_disk(
1614                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1615                                 inline_size);
1616         set_nlink(inode, 2);
1617         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1618 out:
1619         brelse(iloc.bh);
1620         return ret;
1621 }
1622
1623 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1624                                         struct ext4_filename *fname,
1625                                         struct ext4_dir_entry_2 **res_dir,
1626                                         int *has_inline_data)
1627 {
1628         int ret;
1629         struct ext4_iloc iloc;
1630         void *inline_start;
1631         int inline_size;
1632
1633         if (ext4_get_inode_loc(dir, &iloc))
1634                 return NULL;
1635
1636         down_read(&EXT4_I(dir)->xattr_sem);
1637         if (!ext4_has_inline_data(dir)) {
1638                 *has_inline_data = 0;
1639                 goto out;
1640         }
1641
1642         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1643                                                 EXT4_INLINE_DOTDOT_SIZE;
1644         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1645         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1646                               dir, fname, 0, res_dir);
1647         if (ret == 1)
1648                 goto out_find;
1649         if (ret < 0)
1650                 goto out;
1651
1652         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1653                 goto out;
1654
1655         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1656         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1657
1658         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1659                               dir, fname, 0, res_dir);
1660         if (ret == 1)
1661                 goto out_find;
1662
1663 out:
1664         brelse(iloc.bh);
1665         iloc.bh = NULL;
1666 out_find:
1667         up_read(&EXT4_I(dir)->xattr_sem);
1668         return iloc.bh;
1669 }
1670
1671 int ext4_delete_inline_entry(handle_t *handle,
1672                              struct inode *dir,
1673                              struct ext4_dir_entry_2 *de_del,
1674                              struct buffer_head *bh,
1675                              int *has_inline_data)
1676 {
1677         int err, inline_size, no_expand;
1678         struct ext4_iloc iloc;
1679         void *inline_start;
1680
1681         err = ext4_get_inode_loc(dir, &iloc);
1682         if (err)
1683                 return err;
1684
1685         ext4_write_lock_xattr(dir, &no_expand);
1686         if (!ext4_has_inline_data(dir)) {
1687                 *has_inline_data = 0;
1688                 goto out;
1689         }
1690
1691         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1692                 EXT4_MIN_INLINE_DATA_SIZE) {
1693                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1694                                         EXT4_INLINE_DOTDOT_SIZE;
1695                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1696                                 EXT4_INLINE_DOTDOT_SIZE;
1697         } else {
1698                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1699                 inline_size = ext4_get_inline_size(dir) -
1700                                 EXT4_MIN_INLINE_DATA_SIZE;
1701         }
1702
1703         BUFFER_TRACE(bh, "get_write_access");
1704         err = ext4_journal_get_write_access(handle, bh);
1705         if (err)
1706                 goto out;
1707
1708         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1709                                         inline_start, inline_size, 0);
1710         if (err)
1711                 goto out;
1712
1713         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1714 out:
1715         ext4_write_unlock_xattr(dir, &no_expand);
1716         if (likely(err == 0))
1717                 err = ext4_mark_inode_dirty(handle, dir);
1718         brelse(iloc.bh);
1719         if (err != -ENOENT)
1720                 ext4_std_error(dir->i_sb, err);
1721         return err;
1722 }
1723
1724 /*
1725  * Get the inline dentry at offset.
1726  */
1727 static inline struct ext4_dir_entry_2 *
1728 ext4_get_inline_entry(struct inode *inode,
1729                       struct ext4_iloc *iloc,
1730                       unsigned int offset,
1731                       void **inline_start,
1732                       int *inline_size)
1733 {
1734         void *inline_pos;
1735
1736         BUG_ON(offset > ext4_get_inline_size(inode));
1737
1738         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1739                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1740                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1741         } else {
1742                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1743                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1744                 *inline_size = ext4_get_inline_size(inode) -
1745                                 EXT4_MIN_INLINE_DATA_SIZE;
1746         }
1747
1748         if (inline_start)
1749                 *inline_start = inline_pos;
1750         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1751 }
1752
1753 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1754 {
1755         int err, inline_size;
1756         struct ext4_iloc iloc;
1757         size_t inline_len;
1758         void *inline_pos;
1759         unsigned int offset;
1760         struct ext4_dir_entry_2 *de;
1761         bool ret = true;
1762
1763         err = ext4_get_inode_loc(dir, &iloc);
1764         if (err) {
1765                 ext4_set_errno(dir->i_sb, -err);
1766                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1767                                  err, dir->i_ino);
1768                 return true;
1769         }
1770
1771         down_read(&EXT4_I(dir)->xattr_sem);
1772         if (!ext4_has_inline_data(dir)) {
1773                 *has_inline_data = 0;
1774                 goto out;
1775         }
1776
1777         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1778         if (!le32_to_cpu(de->inode)) {
1779                 ext4_warning(dir->i_sb,
1780                              "bad inline directory (dir #%lu) - no `..'",
1781                              dir->i_ino);
1782                 ret = true;
1783                 goto out;
1784         }
1785
1786         inline_len = ext4_get_inline_size(dir);
1787         offset = EXT4_INLINE_DOTDOT_SIZE;
1788         while (offset < inline_len) {
1789                 de = ext4_get_inline_entry(dir, &iloc, offset,
1790                                            &inline_pos, &inline_size);
1791                 if (ext4_check_dir_entry(dir, NULL, de,
1792                                          iloc.bh, inline_pos,
1793                                          inline_size, offset)) {
1794                         ext4_warning(dir->i_sb,
1795                                      "bad inline directory (dir #%lu) - "
1796                                      "inode %u, rec_len %u, name_len %d"
1797                                      "inline size %d",
1798                                      dir->i_ino, le32_to_cpu(de->inode),
1799                                      le16_to_cpu(de->rec_len), de->name_len,
1800                                      inline_size);
1801                         ret = true;
1802                         goto out;
1803                 }
1804                 if (le32_to_cpu(de->inode)) {
1805                         ret = false;
1806                         goto out;
1807                 }
1808                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1809         }
1810
1811 out:
1812         up_read(&EXT4_I(dir)->xattr_sem);
1813         brelse(iloc.bh);
1814         return ret;
1815 }
1816
1817 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1818 {
1819         int ret, no_expand;
1820
1821         ext4_write_lock_xattr(inode, &no_expand);
1822         ret = ext4_destroy_inline_data_nolock(handle, inode);
1823         ext4_write_unlock_xattr(inode, &no_expand);
1824
1825         return ret;
1826 }
1827
1828 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1829 {
1830         __u64 addr;
1831         int error = -EAGAIN;
1832         struct ext4_iloc iloc;
1833
1834         down_read(&EXT4_I(inode)->xattr_sem);
1835         if (!ext4_has_inline_data(inode))
1836                 goto out;
1837
1838         error = ext4_get_inode_loc(inode, &iloc);
1839         if (error)
1840                 goto out;
1841
1842         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1843         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1844         addr += offsetof(struct ext4_inode, i_block);
1845
1846         brelse(iloc.bh);
1847
1848         iomap->addr = addr;
1849         iomap->offset = 0;
1850         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1851                               i_size_read(inode));
1852         iomap->type = IOMAP_INLINE;
1853         iomap->flags = 0;
1854
1855 out:
1856         up_read(&EXT4_I(inode)->xattr_sem);
1857         return error;
1858 }
1859
1860 int ext4_inline_data_fiemap(struct inode *inode,
1861                             struct fiemap_extent_info *fieinfo,
1862                             int *has_inline, __u64 start, __u64 len)
1863 {
1864         __u64 physical = 0;
1865         __u64 inline_len;
1866         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1867                 FIEMAP_EXTENT_LAST;
1868         int error = 0;
1869         struct ext4_iloc iloc;
1870
1871         down_read(&EXT4_I(inode)->xattr_sem);
1872         if (!ext4_has_inline_data(inode)) {
1873                 *has_inline = 0;
1874                 goto out;
1875         }
1876         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1877                            i_size_read(inode));
1878         if (start >= inline_len)
1879                 goto out;
1880         if (start + len < inline_len)
1881                 inline_len = start + len;
1882         inline_len -= start;
1883
1884         error = ext4_get_inode_loc(inode, &iloc);
1885         if (error)
1886                 goto out;
1887
1888         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1889         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1890         physical += offsetof(struct ext4_inode, i_block);
1891
1892         brelse(iloc.bh);
1893 out:
1894         up_read(&EXT4_I(inode)->xattr_sem);
1895         if (physical)
1896                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1897                                                 inline_len, flags);
1898         return (error < 0 ? error : 0);
1899 }
1900
1901 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1902 {
1903         handle_t *handle;
1904         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1905         size_t i_size;
1906         void *value = NULL;
1907         struct ext4_xattr_ibody_find is = {
1908                 .s = { .not_found = -ENODATA, },
1909         };
1910         struct ext4_xattr_info i = {
1911                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1912                 .name = EXT4_XATTR_SYSTEM_DATA,
1913         };
1914
1915
1916         needed_blocks = ext4_writepage_trans_blocks(inode);
1917         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1918         if (IS_ERR(handle))
1919                 return PTR_ERR(handle);
1920
1921         ext4_write_lock_xattr(inode, &no_expand);
1922         if (!ext4_has_inline_data(inode)) {
1923                 *has_inline = 0;
1924                 ext4_journal_stop(handle);
1925                 return 0;
1926         }
1927
1928         if ((err = ext4_orphan_add(handle, inode)) != 0)
1929                 goto out;
1930
1931         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1932                 goto out;
1933
1934         down_write(&EXT4_I(inode)->i_data_sem);
1935         i_size = inode->i_size;
1936         inline_size = ext4_get_inline_size(inode);
1937         EXT4_I(inode)->i_disksize = i_size;
1938
1939         if (i_size < inline_size) {
1940                 /* Clear the content in the xattr space. */
1941                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1942                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1943                                 goto out_error;
1944
1945                         BUG_ON(is.s.not_found);
1946
1947                         value_len = le32_to_cpu(is.s.here->e_value_size);
1948                         value = kmalloc(value_len, GFP_NOFS);
1949                         if (!value) {
1950                                 err = -ENOMEM;
1951                                 goto out_error;
1952                         }
1953
1954                         err = ext4_xattr_ibody_get(inode, i.name_index,
1955                                                    i.name, value, value_len);
1956                         if (err <= 0)
1957                                 goto out_error;
1958
1959                         i.value = value;
1960                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1961                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1962                         err = ext4_xattr_ibody_inline_set(handle, inode,
1963                                                           &i, &is);
1964                         if (err)
1965                                 goto out_error;
1966                 }
1967
1968                 /* Clear the content within i_blocks. */
1969                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1970                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1971                         memset(p + i_size, 0,
1972                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1973                 }
1974
1975                 EXT4_I(inode)->i_inline_size = i_size <
1976                                         EXT4_MIN_INLINE_DATA_SIZE ?
1977                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1978         }
1979
1980 out_error:
1981         up_write(&EXT4_I(inode)->i_data_sem);
1982 out:
1983         brelse(is.iloc.bh);
1984         ext4_write_unlock_xattr(inode, &no_expand);
1985         kfree(value);
1986         if (inode->i_nlink)
1987                 ext4_orphan_del(handle, inode);
1988
1989         if (err == 0) {
1990                 inode->i_mtime = inode->i_ctime = current_time(inode);
1991                 err = ext4_mark_inode_dirty(handle, inode);
1992                 if (IS_SYNC(inode))
1993                         ext4_handle_sync(handle);
1994         }
1995         ext4_journal_stop(handle);
1996         return err;
1997 }
1998
1999 int ext4_convert_inline_data(struct inode *inode)
2000 {
2001         int error, needed_blocks, no_expand;
2002         handle_t *handle;
2003         struct ext4_iloc iloc;
2004
2005         if (!ext4_has_inline_data(inode)) {
2006                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2007                 return 0;
2008         }
2009
2010         needed_blocks = ext4_writepage_trans_blocks(inode);
2011
2012         iloc.bh = NULL;
2013         error = ext4_get_inode_loc(inode, &iloc);
2014         if (error)
2015                 return error;
2016
2017         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2018         if (IS_ERR(handle)) {
2019                 error = PTR_ERR(handle);
2020                 goto out_free;
2021         }
2022
2023         ext4_write_lock_xattr(inode, &no_expand);
2024         if (ext4_has_inline_data(inode))
2025                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2026         ext4_write_unlock_xattr(inode, &no_expand);
2027         ext4_journal_stop(handle);
2028 out_free:
2029         brelse(iloc.bh);
2030         return error;
2031 }