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_err(inode, __func__, __LINE__, 0, -error,
 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_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, inode->i_sb, is.iloc.bh,
 268                                               EXT4_JTR_NONE);
 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 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_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, inode->i_sb, is.iloc.bh,
 355                                               EXT4_JTR_NONE);
 356         if (error)
 357                 goto out;
 358
 359         /* Update the xattr entry. */
 360         i.value = value;
 361         i.value_len = len;
 362
 363         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 364         if (error)
 365                 goto out;
 366
 367         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 368                                       (void *)ext4_raw_inode(&is.iloc));
 369         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 370                                 le32_to_cpu(is.s.here->e_value_size);
 371         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 372         get_bh(is.iloc.bh);
 373         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 374
 375 out:
 376         kfree(value);
 377         brelse(is.iloc.bh);
 378         return error;
 379 }
 380
 381 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 382                                     unsigned int len)
 383 {
 384         int ret, size, no_expand;
 385         struct ext4_inode_info *ei = EXT4_I(inode);
 386
 387         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 388                 return -ENOSPC;
 389
 390         size = ext4_get_max_inline_size(inode);
 391         if (size < len)
 392                 return -ENOSPC;
 393
 394         ext4_write_lock_xattr(inode, &no_expand);
 395
 396         if (ei->i_inline_off)
 397                 ret = ext4_update_inline_data(handle, inode, len);
 398         else
 399                 ret = ext4_create_inline_data(handle, inode, len);
 400
 401         ext4_write_unlock_xattr(inode, &no_expand);
 402         return ret;
 403 }
 404
 405 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 406                                            struct inode *inode)
 407 {
 408         struct ext4_inode_info *ei = EXT4_I(inode);
 409         struct ext4_xattr_ibody_find is = {
 410                 .s = { .not_found = 0, },
 411         };
 412         struct ext4_xattr_info i = {
 413                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 414                 .name = EXT4_XATTR_SYSTEM_DATA,
 415                 .value = NULL,
 416                 .value_len = 0,
 417         };
 418         int error;
 419
 420         if (!ei->i_inline_off)
 421                 return 0;
 422
 423         error = ext4_get_inode_loc(inode, &is.iloc);
 424         if (error)
 425                 return error;
 426
 427         error = ext4_xattr_ibody_find(inode, &i, &is);
 428         if (error)
 429                 goto out;
 430
 431         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 432         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 433                                               EXT4_JTR_NONE);
 434         if (error)
 435                 goto out;
 436
 437         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 438         if (error)
 439                 goto out;
 440
 441         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 442                 0, EXT4_MIN_INLINE_DATA_SIZE);
 443         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 444
 445         if (ext4_has_feature_extents(inode->i_sb)) {
 446                 if (S_ISDIR(inode->i_mode) ||
 447                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 448                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 449                         ext4_ext_tree_init(handle, inode);
 450                 }
 451         }
 452         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 453
 454         get_bh(is.iloc.bh);
 455         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 456
 457         EXT4_I(inode)->i_inline_off = 0;
 458         EXT4_I(inode)->i_inline_size = 0;
 459         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 460 out:
 461         brelse(is.iloc.bh);
 462         if (error == -ENODATA)
 463                 error = 0;
 464         return error;
 465 }
 466
 467 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 468 {
 469         void *kaddr;
 470         int ret = 0;
 471         size_t len;
 472         struct ext4_iloc iloc;
 473
 474         BUG_ON(!PageLocked(page));
 475         BUG_ON(!ext4_has_inline_data(inode));
 476         BUG_ON(page->index);
 477
 478         if (!EXT4_I(inode)->i_inline_off) {
 479                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 480                              inode->i_ino);
 481                 goto out;
 482         }
 483
 484         ret = ext4_get_inode_loc(inode, &iloc);
 485         if (ret)
 486                 goto out;
 487
 488         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 489         kaddr = kmap_atomic(page);
 490         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 491         flush_dcache_page(page);
 492         kunmap_atomic(kaddr);
 493         zero_user_segment(page, len, PAGE_SIZE);
 494         SetPageUptodate(page);
 495         brelse(iloc.bh);
 496
 497 out:
 498         return ret;
 499 }
 500
 501 int ext4_readpage_inline(struct inode *inode, struct page *page)
 502 {
 503         int ret = 0;
 504
 505         down_read(&EXT4_I(inode)->xattr_sem);
 506         if (!ext4_has_inline_data(inode)) {
 507                 up_read(&EXT4_I(inode)->xattr_sem);
 508                 return -EAGAIN;
 509         }
 510
 511         /*
 512          * Current inline data can only exist in the 1st page,
 513          * So for all the other pages, just set them uptodate.
 514          */
 515         if (!page->index)
 516                 ret = ext4_read_inline_page(inode, page);
 517         else if (!PageUptodate(page)) {
 518                 zero_user_segment(page, 0, PAGE_SIZE);
 519                 SetPageUptodate(page);
 520         }
 521
 522         up_read(&EXT4_I(inode)->xattr_sem);
 523
 524         unlock_page(page);
 525         return ret >= 0 ? 0 : ret;
 526 }
 527
 528 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 529                                               struct inode *inode,
 530                                               unsigned flags)
 531 {
 532         int ret, needed_blocks, no_expand;
 533         handle_t *handle = NULL;
 534         int retries = 0, sem_held = 0;
 535         struct page *page = NULL;
 536         unsigned from, to;
 537         struct ext4_iloc iloc;
 538
 539         if (!ext4_has_inline_data(inode)) {
 540                 /*
 541                  * clear the flag so that no new write
 542                  * will trap here again.
 543                  */
 544                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 545                 return 0;
 546         }
 547
 548         needed_blocks = ext4_writepage_trans_blocks(inode);
 549
 550         ret = ext4_get_inode_loc(inode, &iloc);
 551         if (ret)
 552                 return ret;
 553
 554 retry:
 555         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 556         if (IS_ERR(handle)) {
 557                 ret = PTR_ERR(handle);
 558                 handle = NULL;
 559                 goto out;
 560         }
 561
 562         /* We cannot recurse into the filesystem as the transaction is already
 563          * started */
 564         flags |= AOP_FLAG_NOFS;
 565
 566         page = grab_cache_page_write_begin(mapping, 0, flags);
 567         if (!page) {
 568                 ret = -ENOMEM;
 569                 goto out;
 570         }
 571
 572         ext4_write_lock_xattr(inode, &no_expand);
 573         sem_held = 1;
 574         /* If some one has already done this for us, just exit. */
 575         if (!ext4_has_inline_data(inode)) {
 576                 ret = 0;
 577                 goto out;
 578         }
 579
 580         from = 0;
 581         to = ext4_get_inline_size(inode);
 582         if (!PageUptodate(page)) {
 583                 ret = ext4_read_inline_page(inode, page);
 584                 if (ret < 0)
 585                         goto out;
 586         }
 587
 588         ret = ext4_destroy_inline_data_nolock(handle, inode);
 589         if (ret)
 590                 goto out;
 591
 592         if (ext4_should_dioread_nolock(inode)) {
 593                 ret = __block_write_begin(page, from, to,
 594                                           ext4_get_block_unwritten);
 595         } else
 596                 ret = __block_write_begin(page, from, to, ext4_get_block);
 597
 598         if (!ret && ext4_should_journal_data(inode)) {
 599                 ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
 600                                              from, to, NULL,
 601                                              do_journal_get_write_access);
 602         }
 603
 604         if (ret) {
 605                 unlock_page(page);
 606                 put_page(page);
 607                 page = NULL;
 608                 ext4_orphan_add(handle, inode);
 609                 ext4_write_unlock_xattr(inode, &no_expand);
 610                 sem_held = 0;
 611                 ext4_journal_stop(handle);
 612                 handle = NULL;
 613                 ext4_truncate_failed_write(inode);
 614                 /*
 615                  * If truncate failed early the inode might
 616                  * still be on the orphan list; we need to
 617                  * make sure the inode is removed from the
 618                  * orphan list in that case.
 619                  */
 620                 if (inode->i_nlink)
 621                         ext4_orphan_del(NULL, inode);
 622         }
 623
 624         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 625                 goto retry;
 626
 627         if (page)
 628                 block_commit_write(page, from, to);
 629 out:
 630         if (page) {
 631                 unlock_page(page);
 632                 put_page(page);
 633         }
 634         if (sem_held)
 635                 ext4_write_unlock_xattr(inode, &no_expand);
 636         if (handle)
 637                 ext4_journal_stop(handle);
 638         brelse(iloc.bh);
 639         return ret;
 640 }
 641
 642 /*
 643  * Try to write data in the inode.
 644  * If the inode has inline data, check whether the new write can be
 645  * in the inode also. If not, create the page the handle, move the data
 646  * to the page make it update and let the later codes create extent for it.
 647  */
 648 int ext4_try_to_write_inline_data(struct address_space *mapping,
 649                                   struct inode *inode,
 650                                   loff_t pos, unsigned len,
 651                                   unsigned flags,
 652                                   struct page **pagep)
 653 {
 654         int ret;
 655         handle_t *handle;
 656         struct page *page;
 657         struct ext4_iloc iloc;
 658
 659         if (pos + len > ext4_get_max_inline_size(inode))
 660                 goto convert;
 661
 662         ret = ext4_get_inode_loc(inode, &iloc);
 663         if (ret)
 664                 return ret;
 665
 666         /*
 667          * The possible write could happen in the inode,
 668          * so try to reserve the space in inode first.
 669          */
 670         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 671         if (IS_ERR(handle)) {
 672                 ret = PTR_ERR(handle);
 673                 handle = NULL;
 674                 goto out;
 675         }
 676
 677         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 678         if (ret && ret != -ENOSPC)
 679                 goto out;
 680
 681         /* We don't have space in inline inode, so convert it to extent. */
 682         if (ret == -ENOSPC) {
 683                 ext4_journal_stop(handle);
 684                 brelse(iloc.bh);
 685                 goto convert;
 686         }
 687
 688         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 689                                             EXT4_JTR_NONE);
 690         if (ret)
 691                 goto out;
 692
 693         flags |= AOP_FLAG_NOFS;
 694
 695         page = grab_cache_page_write_begin(mapping, 0, flags);
 696         if (!page) {
 697                 ret = -ENOMEM;
 698                 goto out;
 699         }
 700
 701         *pagep = page;
 702         down_read(&EXT4_I(inode)->xattr_sem);
 703         if (!ext4_has_inline_data(inode)) {
 704                 ret = 0;
 705                 unlock_page(page);
 706                 put_page(page);
 707                 goto out_up_read;
 708         }
 709
 710         if (!PageUptodate(page)) {
 711                 ret = ext4_read_inline_page(inode, page);
 712                 if (ret < 0) {
 713                         unlock_page(page);
 714                         put_page(page);
 715                         goto out_up_read;
 716                 }
 717         }
 718
 719         ret = 1;
 720         handle = NULL;
 721 out_up_read:
 722         up_read(&EXT4_I(inode)->xattr_sem);
 723 out:
 724         if (handle && (ret != 1))
 725                 ext4_journal_stop(handle);
 726         brelse(iloc.bh);
 727         return ret;
 728 convert:
 729         return ext4_convert_inline_data_to_extent(mapping,
 730                                                   inode, flags);
 731 }
 732
 733 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 734                                unsigned copied, struct page *page)
 735 {
 736         int ret, no_expand;
 737         void *kaddr;
 738         struct ext4_iloc iloc;
 739
 740         if (unlikely(copied < len)) {
 741                 if (!PageUptodate(page)) {
 742                         copied = 0;
 743                         goto out;
 744                 }
 745         }
 746
 747         ret = ext4_get_inode_loc(inode, &iloc);
 748         if (ret) {
 749                 ext4_std_error(inode->i_sb, ret);
 750                 copied = 0;
 751                 goto out;
 752         }
 753
 754         ext4_write_lock_xattr(inode, &no_expand);
 755         BUG_ON(!ext4_has_inline_data(inode));
 756
 757         /*
 758          * ei->i_inline_off may have changed since ext4_write_begin()
 759          * called ext4_try_to_write_inline_data()
 760          */
 761         (void) ext4_find_inline_data_nolock(inode);
 762
 763         kaddr = kmap_atomic(page);
 764         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 765         kunmap_atomic(kaddr);
 766         SetPageUptodate(page);
 767         /* clear page dirty so that writepages wouldn't work for us. */
 768         ClearPageDirty(page);
 769
 770         ext4_write_unlock_xattr(inode, &no_expand);
 771         brelse(iloc.bh);
 772         mark_inode_dirty(inode);
 773 out:
 774         return copied;
 775 }
 776
 777 struct buffer_head *
 778 ext4_journalled_write_inline_data(struct inode *inode,
 779                                   unsigned len,
 780                                   struct page *page)
 781 {
 782         int ret, no_expand;
 783         void *kaddr;
 784         struct ext4_iloc iloc;
 785
 786         ret = ext4_get_inode_loc(inode, &iloc);
 787         if (ret) {
 788                 ext4_std_error(inode->i_sb, ret);
 789                 return NULL;
 790         }
 791
 792         ext4_write_lock_xattr(inode, &no_expand);
 793         kaddr = kmap_atomic(page);
 794         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 795         kunmap_atomic(kaddr);
 796         ext4_write_unlock_xattr(inode, &no_expand);
 797
 798         return iloc.bh;
 799 }
 800
 801 /*
 802  * Try to make the page cache and handle ready for the inline data case.
 803  * We can call this function in 2 cases:
 804  * 1. The inode is created and the first write exceeds inline size. We can
 805  *    clear the inode state safely.
 806  * 2. The inode has inline data, then we need to read the data, make it
 807  *    update and dirty so that ext4_da_writepages can handle it. We don't
 808  *    need to start the journal since the file's metadata isn't changed now.
 809  */
 810 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 811                                                  struct inode *inode,
 812                                                  unsigned flags,
 813                                                  void **fsdata)
 814 {
 815         int ret = 0, inline_size;
 816         struct page *page;
 817
 818         page = grab_cache_page_write_begin(mapping, 0, flags);
 819         if (!page)
 820                 return -ENOMEM;
 821
 822         down_read(&EXT4_I(inode)->xattr_sem);
 823         if (!ext4_has_inline_data(inode)) {
 824                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 825                 goto out;
 826         }
 827
 828         inline_size = ext4_get_inline_size(inode);
 829
 830         if (!PageUptodate(page)) {
 831                 ret = ext4_read_inline_page(inode, page);
 832                 if (ret < 0)
 833                         goto out;
 834         }
 835
 836         ret = __block_write_begin(page, 0, inline_size,
 837                                   ext4_da_get_block_prep);
 838         if (ret) {
 839                 up_read(&EXT4_I(inode)->xattr_sem);
 840                 unlock_page(page);
 841                 put_page(page);
 842                 ext4_truncate_failed_write(inode);
 843                 return ret;
 844         }
 845
 846         SetPageDirty(page);
 847         SetPageUptodate(page);
 848         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 849         *fsdata = (void *)CONVERT_INLINE_DATA;
 850
 851 out:
 852         up_read(&EXT4_I(inode)->xattr_sem);
 853         if (page) {
 854                 unlock_page(page);
 855                 put_page(page);
 856         }
 857         return ret;
 858 }
 859
 860 /*
 861  * Prepare the write for the inline data.
 862  * If the data can be written into the inode, we just read
 863  * the page and make it uptodate, and start the journal.
 864  * Otherwise read the page, makes it dirty so that it can be
 865  * handle in writepages(the i_disksize update is left to the
 866  * normal ext4_da_write_end).
 867  */
 868 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 869                                     struct inode *inode,
 870                                     loff_t pos, unsigned len,
 871                                     unsigned flags,
 872                                     struct page **pagep,
 873                                     void **fsdata)
 874 {
 875         int ret, inline_size;
 876         handle_t *handle;
 877         struct page *page;
 878         struct ext4_iloc iloc;
 879         int retries = 0;
 880
 881         ret = ext4_get_inode_loc(inode, &iloc);
 882         if (ret)
 883                 return ret;
 884
 885 retry_journal:
 886         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 887         if (IS_ERR(handle)) {
 888                 ret = PTR_ERR(handle);
 889                 goto out;
 890         }
 891
 892         inline_size = ext4_get_max_inline_size(inode);
 893
 894         ret = -ENOSPC;
 895         if (inline_size >= pos + len) {
 896                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 897                 if (ret && ret != -ENOSPC)
 898                         goto out_journal;
 899         }
 900
 901         /*
 902          * We cannot recurse into the filesystem as the transaction
 903          * is already started.
 904          */
 905         flags |= AOP_FLAG_NOFS;
 906
 907         if (ret == -ENOSPC) {
 908                 ext4_journal_stop(handle);
 909                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 910                                                             inode,
 911                                                             flags,
 912                                                             fsdata);
 913                 if (ret == -ENOSPC &&
 914                     ext4_should_retry_alloc(inode->i_sb, &retries))
 915                         goto retry_journal;
 916                 goto out;
 917         }
 918
 919         page = grab_cache_page_write_begin(mapping, 0, flags);
 920         if (!page) {
 921                 ret = -ENOMEM;
 922                 goto out_journal;
 923         }
 924
 925         down_read(&EXT4_I(inode)->xattr_sem);
 926         if (!ext4_has_inline_data(inode)) {
 927                 ret = 0;
 928                 goto out_release_page;
 929         }
 930
 931         if (!PageUptodate(page)) {
 932                 ret = ext4_read_inline_page(inode, page);
 933                 if (ret < 0)
 934                         goto out_release_page;
 935         }
 936         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 937                                             EXT4_JTR_NONE);
 938         if (ret)
 939                 goto out_release_page;
 940
 941         up_read(&EXT4_I(inode)->xattr_sem);
 942         *pagep = page;
 943         brelse(iloc.bh);
 944         return 1;
 945 out_release_page:
 946         up_read(&EXT4_I(inode)->xattr_sem);
 947         unlock_page(page);
 948         put_page(page);
 949 out_journal:
 950         ext4_journal_stop(handle);
 951 out:
 952         brelse(iloc.bh);
 953         return ret;
 954 }
 955
 956 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 957                                   unsigned len, unsigned copied,
 958                                   struct page *page)
 959 {
 960         int ret;
 961
 962         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 963         if (ret < 0) {
 964                 unlock_page(page);
 965                 put_page(page);
 966                 return ret;
 967         }
 968         copied = ret;
 969
 970         /*
 971          * No need to use i_size_read() here, the i_size
 972          * cannot change under us because we hold i_mutex.
 973          *
 974          * But it's important to update i_size while still holding page lock:
 975          * page writeout could otherwise come in and zero beyond i_size.
 976          */
 977         if (pos+copied > inode->i_size)
 978                 i_size_write(inode, pos+copied);
 979         unlock_page(page);
 980         put_page(page);
 981
 982         /*
 983          * Don't mark the inode dirty under page lock. First, it unnecessarily
 984          * makes the holding time of page lock longer. Second, it forces lock
 985          * ordering of page lock and transaction start for journaling
 986          * filesystems.
 987          */
 988         mark_inode_dirty(inode);
 989
 990         return copied;
 991 }
 992
 993 #ifdef INLINE_DIR_DEBUG
 994 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 995                           void *inline_start, int inline_size)
 996 {
 997         int offset;
 998         unsigned short de_len;
 999         struct ext4_dir_entry_2 *de = inline_start;
1000         void *dlimit = inline_start + inline_size;
1001
1002         trace_printk("inode %lu\n", dir->i_ino);
1003         offset = 0;
1004         while ((void *)de < dlimit) {
1005                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1006                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1007                              offset, de_len, de->name_len, de->name,
1008                              de->name_len, le32_to_cpu(de->inode));
1009                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1010                                          inline_start, inline_size, offset))
1011                         BUG();
1012
1013                 offset += de_len;
1014                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1015         }
1016 }
1017 #else
1018 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1019 #endif
1020
1021 /*
1022  * Add a new entry into a inline dir.
1023  * It will return -ENOSPC if no space is available, and -EIO
1024  * and -EEXIST if directory entry already exists.
1025  */
1026 static int ext4_add_dirent_to_inline(handle_t *handle,
1027                                      struct ext4_filename *fname,
1028                                      struct inode *dir,
1029                                      struct inode *inode,
1030                                      struct ext4_iloc *iloc,
1031                                      void *inline_start, int inline_size)
1032 {
1033         int             err;
1034         struct ext4_dir_entry_2 *de;
1035
1036         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1037                                 inline_size, fname, &de);
1038         if (err)
1039                 return err;
1040
1041         BUFFER_TRACE(iloc->bh, "get_write_access");
1042         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1043                                             EXT4_JTR_NONE);
1044         if (err)
1045                 return err;
1046         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1047
1048         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1049
1050         /*
1051          * XXX shouldn't update any times until successful
1052          * completion of syscall, but too many callers depend
1053          * on this.
1054          *
1055          * XXX similarly, too many callers depend on
1056          * ext4_new_inode() setting the times, but error
1057          * recovery deletes the inode, so the worst that can
1058          * happen is that the times are slightly out of date
1059          * and/or different from the directory change time.
1060          */
1061         dir->i_mtime = dir->i_ctime = current_time(dir);
1062         ext4_update_dx_flag(dir);
1063         inode_inc_iversion(dir);
1064         return 1;
1065 }
1066
1067 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1068                                        struct ext4_iloc *iloc)
1069 {
1070         struct ext4_xattr_entry *entry;
1071         struct ext4_xattr_ibody_header *header;
1072
1073         BUG_ON(!EXT4_I(inode)->i_inline_off);
1074
1075         header = IHDR(inode, ext4_raw_inode(iloc));
1076         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1077                                             EXT4_I(inode)->i_inline_off);
1078
1079         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1080 }
1081
1082 /* Set the final de to cover the whole block. */
1083 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1084 {
1085         struct ext4_dir_entry_2 *de, *prev_de;
1086         void *limit;
1087         int de_len;
1088
1089         de = (struct ext4_dir_entry_2 *)de_buf;
1090         if (old_size) {
1091                 limit = de_buf + old_size;
1092                 do {
1093                         prev_de = de;
1094                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1095                         de_buf += de_len;
1096                         de = (struct ext4_dir_entry_2 *)de_buf;
1097                 } while (de_buf < limit);
1098
1099                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1100                                                         old_size, new_size);
1101         } else {
1102                 /* this is just created, so create an empty entry. */
1103                 de->inode = 0;
1104                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1105         }
1106 }
1107
1108 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1109                                   struct ext4_iloc *iloc)
1110 {
1111         int ret;
1112         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1113         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1114
1115         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1116                 return -ENOSPC;
1117
1118         ret = ext4_update_inline_data(handle, dir,
1119                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1120         if (ret)
1121                 return ret;
1122
1123         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1124                              EXT4_I(dir)->i_inline_size -
1125                                                 EXT4_MIN_INLINE_DATA_SIZE);
1126         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1127         return 0;
1128 }
1129
1130 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1131                                      struct ext4_iloc *iloc,
1132                                      void *buf, int inline_size)
1133 {
1134         ext4_create_inline_data(handle, inode, inline_size);
1135         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1136         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1137 }
1138
1139 static int ext4_finish_convert_inline_dir(handle_t *handle,
1140                                           struct inode *inode,
1141                                           struct buffer_head *dir_block,
1142                                           void *buf,
1143                                           int inline_size)
1144 {
1145         int err, csum_size = 0, header_size = 0;
1146         struct ext4_dir_entry_2 *de;
1147         void *target = dir_block->b_data;
1148
1149         /*
1150          * First create "." and ".." and then copy the dir information
1151          * back to the block.
1152          */
1153         de = (struct ext4_dir_entry_2 *)target;
1154         de = ext4_init_dot_dotdot(inode, de,
1155                 inode->i_sb->s_blocksize, csum_size,
1156                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1157         header_size = (void *)de - target;
1158
1159         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1160                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1161
1162         if (ext4_has_metadata_csum(inode->i_sb))
1163                 csum_size = sizeof(struct ext4_dir_entry_tail);
1164
1165         inode->i_size = inode->i_sb->s_blocksize;
1166         i_size_write(inode, inode->i_sb->s_blocksize);
1167         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1168         ext4_update_final_de(dir_block->b_data,
1169                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1170                         inode->i_sb->s_blocksize - csum_size);
1171
1172         if (csum_size)
1173                 ext4_initialize_dirent_tail(dir_block,
1174                                             inode->i_sb->s_blocksize);
1175         set_buffer_uptodate(dir_block);
1176         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1177         if (err)
1178                 return err;
1179         set_buffer_verified(dir_block);
1180         return ext4_mark_inode_dirty(handle, inode);
1181 }
1182
1183 static int ext4_convert_inline_data_nolock(handle_t *handle,
1184                                            struct inode *inode,
1185                                            struct ext4_iloc *iloc)
1186 {
1187         int error;
1188         void *buf = NULL;
1189         struct buffer_head *data_bh = NULL;
1190         struct ext4_map_blocks map;
1191         int inline_size;
1192
1193         inline_size = ext4_get_inline_size(inode);
1194         buf = kmalloc(inline_size, GFP_NOFS);
1195         if (!buf) {
1196                 error = -ENOMEM;
1197                 goto out;
1198         }
1199
1200         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1201         if (error < 0)
1202                 goto out;
1203
1204         /*
1205          * Make sure the inline directory entries pass checks before we try to
1206          * convert them, so that we avoid touching stuff that needs fsck.
1207          */
1208         if (S_ISDIR(inode->i_mode)) {
1209                 error = ext4_check_all_de(inode, iloc->bh,
1210                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1211                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1212                 if (error)
1213                         goto out;
1214         }
1215
1216         error = ext4_destroy_inline_data_nolock(handle, inode);
1217         if (error)
1218                 goto out;
1219
1220         map.m_lblk = 0;
1221         map.m_len = 1;
1222         map.m_flags = 0;
1223         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1224         if (error < 0)
1225                 goto out_restore;
1226         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1227                 error = -EIO;
1228                 goto out_restore;
1229         }
1230
1231         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1232         if (!data_bh) {
1233                 error = -ENOMEM;
1234                 goto out_restore;
1235         }
1236
1237         lock_buffer(data_bh);
1238         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1239                                                EXT4_JTR_NONE);
1240         if (error) {
1241                 unlock_buffer(data_bh);
1242                 error = -EIO;
1243                 goto out_restore;
1244         }
1245         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1246
1247         if (!S_ISDIR(inode->i_mode)) {
1248                 memcpy(data_bh->b_data, buf, inline_size);
1249                 set_buffer_uptodate(data_bh);
1250                 error = ext4_handle_dirty_metadata(handle,
1251                                                    inode, data_bh);
1252         } else {
1253                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1254                                                        buf, inline_size);
1255         }
1256
1257         unlock_buffer(data_bh);
1258 out_restore:
1259         if (error)
1260                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1261
1262 out:
1263         brelse(data_bh);
1264         kfree(buf);
1265         return error;
1266 }
1267
1268 /*
1269  * Try to add the new entry to the inline data.
1270  * If succeeds, return 0. If not, extended the inline dir and copied data to
1271  * the new created block.
1272  */
1273 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1274                               struct inode *dir, struct inode *inode)
1275 {
1276         int ret, ret2, inline_size, no_expand;
1277         void *inline_start;
1278         struct ext4_iloc iloc;
1279
1280         ret = ext4_get_inode_loc(dir, &iloc);
1281         if (ret)
1282                 return ret;
1283
1284         ext4_write_lock_xattr(dir, &no_expand);
1285         if (!ext4_has_inline_data(dir))
1286                 goto out;
1287
1288         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1289                                                  EXT4_INLINE_DOTDOT_SIZE;
1290         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1291
1292         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1293                                         inline_start, inline_size);
1294         if (ret != -ENOSPC)
1295                 goto out;
1296
1297         /* check whether it can be inserted to inline xattr space. */
1298         inline_size = EXT4_I(dir)->i_inline_size -
1299                         EXT4_MIN_INLINE_DATA_SIZE;
1300         if (!inline_size) {
1301                 /* Try to use the xattr space.*/
1302                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1303                 if (ret && ret != -ENOSPC)
1304                         goto out;
1305
1306                 inline_size = EXT4_I(dir)->i_inline_size -
1307                                 EXT4_MIN_INLINE_DATA_SIZE;
1308         }
1309
1310         if (inline_size) {
1311                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1312
1313                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1314                                                 inode, &iloc, inline_start,
1315                                                 inline_size);
1316
1317                 if (ret != -ENOSPC)
1318                         goto out;
1319         }
1320
1321         /*
1322          * The inline space is filled up, so create a new block for it.
1323          * As the extent tree will be created, we have to save the inline
1324          * dir first.
1325          */
1326         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1327
1328 out:
1329         ext4_write_unlock_xattr(dir, &no_expand);
1330         ret2 = ext4_mark_inode_dirty(handle, dir);
1331         if (unlikely(ret2 && !ret))
1332                 ret = ret2;
1333         brelse(iloc.bh);
1334         return ret;
1335 }
1336
1337 /*
1338  * This function fills a red-black tree with information from an
1339  * inlined dir.  It returns the number directory entries loaded
1340  * into the tree.  If there is an error it is returned in err.
1341  */
1342 int ext4_inlinedir_to_tree(struct file *dir_file,
1343                            struct inode *dir, ext4_lblk_t block,
1344                            struct dx_hash_info *hinfo,
1345                            __u32 start_hash, __u32 start_minor_hash,
1346                            int *has_inline_data)
1347 {
1348         int err = 0, count = 0;
1349         unsigned int parent_ino;
1350         int pos;
1351         struct ext4_dir_entry_2 *de;
1352         struct inode *inode = file_inode(dir_file);
1353         int ret, inline_size = 0;
1354         struct ext4_iloc iloc;
1355         void *dir_buf = NULL;
1356         struct ext4_dir_entry_2 fake;
1357         struct fscrypt_str tmp_str;
1358
1359         ret = ext4_get_inode_loc(inode, &iloc);
1360         if (ret)
1361                 return ret;
1362
1363         down_read(&EXT4_I(inode)->xattr_sem);
1364         if (!ext4_has_inline_data(inode)) {
1365                 up_read(&EXT4_I(inode)->xattr_sem);
1366                 *has_inline_data = 0;
1367                 goto out;
1368         }
1369
1370         inline_size = ext4_get_inline_size(inode);
1371         dir_buf = kmalloc(inline_size, GFP_NOFS);
1372         if (!dir_buf) {
1373                 ret = -ENOMEM;
1374                 up_read(&EXT4_I(inode)->xattr_sem);
1375                 goto out;
1376         }
1377
1378         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1379         up_read(&EXT4_I(inode)->xattr_sem);
1380         if (ret < 0)
1381                 goto out;
1382
1383         pos = 0;
1384         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1385         while (pos < inline_size) {
1386                 /*
1387                  * As inlined dir doesn't store any information about '.' and
1388                  * only the inode number of '..' is stored, we have to handle
1389                  * them differently.
1390                  */
1391                 if (pos == 0) {
1392                         fake.inode = cpu_to_le32(inode->i_ino);
1393                         fake.name_len = 1;
1394                         strcpy(fake.name, ".");
1395                         fake.rec_len = ext4_rec_len_to_disk(
1396                                           ext4_dir_rec_len(fake.name_len, NULL),
1397                                           inline_size);
1398                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1399                         de = &fake;
1400                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1401                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1402                         fake.inode = cpu_to_le32(parent_ino);
1403                         fake.name_len = 2;
1404                         strcpy(fake.name, "..");
1405                         fake.rec_len = ext4_rec_len_to_disk(
1406                                           ext4_dir_rec_len(fake.name_len, NULL),
1407                                           inline_size);
1408                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1409                         de = &fake;
1410                         pos = EXT4_INLINE_DOTDOT_SIZE;
1411                 } else {
1412                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1413                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1414                         if (ext4_check_dir_entry(inode, dir_file, de,
1415                                          iloc.bh, dir_buf,
1416                                          inline_size, pos)) {
1417                                 ret = count;
1418                                 goto out;
1419                         }
1420                 }
1421
1422                 if (ext4_hash_in_dirent(dir)) {
1423                         hinfo->hash = EXT4_DIRENT_HASH(de);
1424                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1425                 } else {
1426                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1427                 }
1428                 if ((hinfo->hash < start_hash) ||
1429                     ((hinfo->hash == start_hash) &&
1430                      (hinfo->minor_hash < start_minor_hash)))
1431                         continue;
1432                 if (de->inode == 0)
1433                         continue;
1434                 tmp_str.name = de->name;
1435                 tmp_str.len = de->name_len;
1436                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1437                                               hinfo->minor_hash, de, &tmp_str);
1438                 if (err) {
1439                         ret = err;
1440                         goto out;
1441                 }
1442                 count++;
1443         }
1444         ret = count;
1445 out:
1446         kfree(dir_buf);
1447         brelse(iloc.bh);
1448         return ret;
1449 }
1450
1451 /*
1452  * So this function is called when the volume is mkfsed with
1453  * dir_index disabled. In order to keep f_pos persistent
1454  * after we convert from an inlined dir to a blocked based,
1455  * we just pretend that we are a normal dir and return the
1456  * offset as if '.' and '..' really take place.
1457  *
1458  */
1459 int ext4_read_inline_dir(struct file *file,
1460                          struct dir_context *ctx,
1461                          int *has_inline_data)
1462 {
1463         unsigned int offset, parent_ino;
1464         int i;
1465         struct ext4_dir_entry_2 *de;
1466         struct super_block *sb;
1467         struct inode *inode = file_inode(file);
1468         int ret, inline_size = 0;
1469         struct ext4_iloc iloc;
1470         void *dir_buf = NULL;
1471         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1472
1473         ret = ext4_get_inode_loc(inode, &iloc);
1474         if (ret)
1475                 return ret;
1476
1477         down_read(&EXT4_I(inode)->xattr_sem);
1478         if (!ext4_has_inline_data(inode)) {
1479                 up_read(&EXT4_I(inode)->xattr_sem);
1480                 *has_inline_data = 0;
1481                 goto out;
1482         }
1483
1484         inline_size = ext4_get_inline_size(inode);
1485         dir_buf = kmalloc(inline_size, GFP_NOFS);
1486         if (!dir_buf) {
1487                 ret = -ENOMEM;
1488                 up_read(&EXT4_I(inode)->xattr_sem);
1489                 goto out;
1490         }
1491
1492         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1493         up_read(&EXT4_I(inode)->xattr_sem);
1494         if (ret < 0)
1495                 goto out;
1496
1497         ret = 0;
1498         sb = inode->i_sb;
1499         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1500         offset = ctx->pos;
1501
1502         /*
1503          * dotdot_offset and dotdot_size is the real offset and
1504          * size for ".." and "." if the dir is block based while
1505          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1506          * So we will use extra_offset and extra_size to indicate them
1507          * during the inline dir iteration.
1508          */
1509         dotdot_offset = ext4_dir_rec_len(1, NULL);
1510         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1511         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1512         extra_size = extra_offset + inline_size;
1513
1514         /*
1515          * If the version has changed since the last call to
1516          * readdir(2), then we might be pointing to an invalid
1517          * dirent right now.  Scan from the start of the inline
1518          * dir to make sure.
1519          */
1520         if (!inode_eq_iversion(inode, file->f_version)) {
1521                 for (i = 0; i < extra_size && i < offset;) {
1522                         /*
1523                          * "." is with offset 0 and
1524                          * ".." is dotdot_offset.
1525                          */
1526                         if (!i) {
1527                                 i = dotdot_offset;
1528                                 continue;
1529                         } else if (i == dotdot_offset) {
1530                                 i = dotdot_size;
1531                                 continue;
1532                         }
1533                         /* for other entry, the real offset in
1534                          * the buf has to be tuned accordingly.
1535                          */
1536                         de = (struct ext4_dir_entry_2 *)
1537                                 (dir_buf + i - extra_offset);
1538                         /* It's too expensive to do a full
1539                          * dirent test each time round this
1540                          * loop, but we do have to test at
1541                          * least that it is non-zero.  A
1542                          * failure will be detected in the
1543                          * dirent test below. */
1544                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1545                                 < ext4_dir_rec_len(1, NULL))
1546                                 break;
1547                         i += ext4_rec_len_from_disk(de->rec_len,
1548                                                     extra_size);
1549                 }
1550                 offset = i;
1551                 ctx->pos = offset;
1552                 file->f_version = inode_query_iversion(inode);
1553         }
1554
1555         while (ctx->pos < extra_size) {
1556                 if (ctx->pos == 0) {
1557                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1558                                 goto out;
1559                         ctx->pos = dotdot_offset;
1560                         continue;
1561                 }
1562
1563                 if (ctx->pos == dotdot_offset) {
1564                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1565                                 goto out;
1566                         ctx->pos = dotdot_size;
1567                         continue;
1568                 }
1569
1570                 de = (struct ext4_dir_entry_2 *)
1571                         (dir_buf + ctx->pos - extra_offset);
1572                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1573                                          extra_size, ctx->pos))
1574                         goto out;
1575                 if (le32_to_cpu(de->inode)) {
1576                         if (!dir_emit(ctx, de->name, de->name_len,
1577                                       le32_to_cpu(de->inode),
1578                                       get_dtype(sb, de->file_type)))
1579                                 goto out;
1580                 }
1581                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1582         }
1583 out:
1584         kfree(dir_buf);
1585         brelse(iloc.bh);
1586         return ret;
1587 }
1588
1589 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1590                                         struct ext4_dir_entry_2 **parent_de,
1591                                         int *retval)
1592 {
1593         struct ext4_iloc iloc;
1594
1595         *retval = ext4_get_inode_loc(inode, &iloc);
1596         if (*retval)
1597                 return NULL;
1598
1599         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1600
1601         return iloc.bh;
1602 }
1603
1604 /*
1605  * Try to create the inline data for the new dir.
1606  * If it succeeds, return 0, otherwise return the error.
1607  * In case of ENOSPC, the caller should create the normal disk layout dir.
1608  */
1609 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1610                                struct inode *inode)
1611 {
1612         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1613         struct ext4_iloc iloc;
1614         struct ext4_dir_entry_2 *de;
1615
1616         ret = ext4_get_inode_loc(inode, &iloc);
1617         if (ret)
1618                 return ret;
1619
1620         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1621         if (ret)
1622                 goto out;
1623
1624         /*
1625          * For inline dir, we only save the inode information for the ".."
1626          * and create a fake dentry to cover the left space.
1627          */
1628         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1629         de->inode = cpu_to_le32(parent->i_ino);
1630         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1631         de->inode = 0;
1632         de->rec_len = ext4_rec_len_to_disk(
1633                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1634                                 inline_size);
1635         set_nlink(inode, 2);
1636         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1637 out:
1638         brelse(iloc.bh);
1639         return ret;
1640 }
1641
1642 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1643                                         struct ext4_filename *fname,
1644                                         struct ext4_dir_entry_2 **res_dir,
1645                                         int *has_inline_data)
1646 {
1647         int ret;
1648         struct ext4_iloc iloc;
1649         void *inline_start;
1650         int inline_size;
1651
1652         if (ext4_get_inode_loc(dir, &iloc))
1653                 return NULL;
1654
1655         down_read(&EXT4_I(dir)->xattr_sem);
1656         if (!ext4_has_inline_data(dir)) {
1657                 *has_inline_data = 0;
1658                 goto out;
1659         }
1660
1661         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1662                                                 EXT4_INLINE_DOTDOT_SIZE;
1663         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1664         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1665                               dir, fname, 0, res_dir);
1666         if (ret == 1)
1667                 goto out_find;
1668         if (ret < 0)
1669                 goto out;
1670
1671         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1672                 goto out;
1673
1674         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1675         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1676
1677         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1678                               dir, fname, 0, res_dir);
1679         if (ret == 1)
1680                 goto out_find;
1681
1682 out:
1683         brelse(iloc.bh);
1684         iloc.bh = NULL;
1685 out_find:
1686         up_read(&EXT4_I(dir)->xattr_sem);
1687         return iloc.bh;
1688 }
1689
1690 int ext4_delete_inline_entry(handle_t *handle,
1691                              struct inode *dir,
1692                              struct ext4_dir_entry_2 *de_del,
1693                              struct buffer_head *bh,
1694                              int *has_inline_data)
1695 {
1696         int err, inline_size, no_expand;
1697         struct ext4_iloc iloc;
1698         void *inline_start;
1699
1700         err = ext4_get_inode_loc(dir, &iloc);
1701         if (err)
1702                 return err;
1703
1704         ext4_write_lock_xattr(dir, &no_expand);
1705         if (!ext4_has_inline_data(dir)) {
1706                 *has_inline_data = 0;
1707                 goto out;
1708         }
1709
1710         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1711                 EXT4_MIN_INLINE_DATA_SIZE) {
1712                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1713                                         EXT4_INLINE_DOTDOT_SIZE;
1714                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1715                                 EXT4_INLINE_DOTDOT_SIZE;
1716         } else {
1717                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1718                 inline_size = ext4_get_inline_size(dir) -
1719                                 EXT4_MIN_INLINE_DATA_SIZE;
1720         }
1721
1722         BUFFER_TRACE(bh, "get_write_access");
1723         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1724                                             EXT4_JTR_NONE);
1725         if (err)
1726                 goto out;
1727
1728         err = ext4_generic_delete_entry(dir, de_del, bh,
1729                                         inline_start, inline_size, 0);
1730         if (err)
1731                 goto out;
1732
1733         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1734 out:
1735         ext4_write_unlock_xattr(dir, &no_expand);
1736         if (likely(err == 0))
1737                 err = ext4_mark_inode_dirty(handle, dir);
1738         brelse(iloc.bh);
1739         if (err != -ENOENT)
1740                 ext4_std_error(dir->i_sb, err);
1741         return err;
1742 }
1743
1744 /*
1745  * Get the inline dentry at offset.
1746  */
1747 static inline struct ext4_dir_entry_2 *
1748 ext4_get_inline_entry(struct inode *inode,
1749                       struct ext4_iloc *iloc,
1750                       unsigned int offset,
1751                       void **inline_start,
1752                       int *inline_size)
1753 {
1754         void *inline_pos;
1755
1756         BUG_ON(offset > ext4_get_inline_size(inode));
1757
1758         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1759                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1760                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1761         } else {
1762                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1763                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1764                 *inline_size = ext4_get_inline_size(inode) -
1765                                 EXT4_MIN_INLINE_DATA_SIZE;
1766         }
1767
1768         if (inline_start)
1769                 *inline_start = inline_pos;
1770         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1771 }
1772
1773 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1774 {
1775         int err, inline_size;
1776         struct ext4_iloc iloc;
1777         size_t inline_len;
1778         void *inline_pos;
1779         unsigned int offset;
1780         struct ext4_dir_entry_2 *de;
1781         bool ret = true;
1782
1783         err = ext4_get_inode_loc(dir, &iloc);
1784         if (err) {
1785                 EXT4_ERROR_INODE_ERR(dir, -err,
1786                                      "error %d getting inode %lu block",
1787                                      err, dir->i_ino);
1788                 return true;
1789         }
1790
1791         down_read(&EXT4_I(dir)->xattr_sem);
1792         if (!ext4_has_inline_data(dir)) {
1793                 *has_inline_data = 0;
1794                 goto out;
1795         }
1796
1797         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1798         if (!le32_to_cpu(de->inode)) {
1799                 ext4_warning(dir->i_sb,
1800                              "bad inline directory (dir #%lu) - no `..'",
1801                              dir->i_ino);
1802                 ret = true;
1803                 goto out;
1804         }
1805
1806         inline_len = ext4_get_inline_size(dir);
1807         offset = EXT4_INLINE_DOTDOT_SIZE;
1808         while (offset < inline_len) {
1809                 de = ext4_get_inline_entry(dir, &iloc, offset,
1810                                            &inline_pos, &inline_size);
1811                 if (ext4_check_dir_entry(dir, NULL, de,
1812                                          iloc.bh, inline_pos,
1813                                          inline_size, offset)) {
1814                         ext4_warning(dir->i_sb,
1815                                      "bad inline directory (dir #%lu) - "
1816                                      "inode %u, rec_len %u, name_len %d"
1817                                      "inline size %d",
1818                                      dir->i_ino, le32_to_cpu(de->inode),
1819                                      le16_to_cpu(de->rec_len), de->name_len,
1820                                      inline_size);
1821                         ret = true;
1822                         goto out;
1823                 }
1824                 if (le32_to_cpu(de->inode)) {
1825                         ret = false;
1826                         goto out;
1827                 }
1828                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1829         }
1830
1831 out:
1832         up_read(&EXT4_I(dir)->xattr_sem);
1833         brelse(iloc.bh);
1834         return ret;
1835 }
1836
1837 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1838 {
1839         int ret, no_expand;
1840
1841         ext4_write_lock_xattr(inode, &no_expand);
1842         ret = ext4_destroy_inline_data_nolock(handle, inode);
1843         ext4_write_unlock_xattr(inode, &no_expand);
1844
1845         return ret;
1846 }
1847
1848 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1849 {
1850         __u64 addr;
1851         int error = -EAGAIN;
1852         struct ext4_iloc iloc;
1853
1854         down_read(&EXT4_I(inode)->xattr_sem);
1855         if (!ext4_has_inline_data(inode))
1856                 goto out;
1857
1858         error = ext4_get_inode_loc(inode, &iloc);
1859         if (error)
1860                 goto out;
1861
1862         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1863         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1864         addr += offsetof(struct ext4_inode, i_block);
1865
1866         brelse(iloc.bh);
1867
1868         iomap->addr = addr;
1869         iomap->offset = 0;
1870         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1871                               i_size_read(inode));
1872         iomap->type = IOMAP_INLINE;
1873         iomap->flags = 0;
1874
1875 out:
1876         up_read(&EXT4_I(inode)->xattr_sem);
1877         return error;
1878 }
1879
1880 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1881 {
1882         handle_t *handle;
1883         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1884         size_t i_size;
1885         void *value = NULL;
1886         struct ext4_xattr_ibody_find is = {
1887                 .s = { .not_found = -ENODATA, },
1888         };
1889         struct ext4_xattr_info i = {
1890                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1891                 .name = EXT4_XATTR_SYSTEM_DATA,
1892         };
1893
1894
1895         needed_blocks = ext4_writepage_trans_blocks(inode);
1896         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1897         if (IS_ERR(handle))
1898                 return PTR_ERR(handle);
1899
1900         ext4_write_lock_xattr(inode, &no_expand);
1901         if (!ext4_has_inline_data(inode)) {
1902                 ext4_write_unlock_xattr(inode, &no_expand);
1903                 *has_inline = 0;
1904                 ext4_journal_stop(handle);
1905                 return 0;
1906         }
1907
1908         if ((err = ext4_orphan_add(handle, inode)) != 0)
1909                 goto out;
1910
1911         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1912                 goto out;
1913
1914         down_write(&EXT4_I(inode)->i_data_sem);
1915         i_size = inode->i_size;
1916         inline_size = ext4_get_inline_size(inode);
1917         EXT4_I(inode)->i_disksize = i_size;
1918
1919         if (i_size < inline_size) {
1920                 /* Clear the content in the xattr space. */
1921                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1922                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1923                                 goto out_error;
1924
1925                         BUG_ON(is.s.not_found);
1926
1927                         value_len = le32_to_cpu(is.s.here->e_value_size);
1928                         value = kmalloc(value_len, GFP_NOFS);
1929                         if (!value) {
1930                                 err = -ENOMEM;
1931                                 goto out_error;
1932                         }
1933
1934                         err = ext4_xattr_ibody_get(inode, i.name_index,
1935                                                    i.name, value, value_len);
1936                         if (err <= 0)
1937                                 goto out_error;
1938
1939                         i.value = value;
1940                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1941                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1942                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1943                         if (err)
1944                                 goto out_error;
1945                 }
1946
1947                 /* Clear the content within i_blocks. */
1948                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1949                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1950                         memset(p + i_size, 0,
1951                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1952                 }
1953
1954                 EXT4_I(inode)->i_inline_size = i_size <
1955                                         EXT4_MIN_INLINE_DATA_SIZE ?
1956                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1957         }
1958
1959 out_error:
1960         up_write(&EXT4_I(inode)->i_data_sem);
1961 out:
1962         brelse(is.iloc.bh);
1963         ext4_write_unlock_xattr(inode, &no_expand);
1964         kfree(value);
1965         if (inode->i_nlink)
1966                 ext4_orphan_del(handle, inode);
1967
1968         if (err == 0) {
1969                 inode->i_mtime = inode->i_ctime = current_time(inode);
1970                 err = ext4_mark_inode_dirty(handle, inode);
1971                 if (IS_SYNC(inode))
1972                         ext4_handle_sync(handle);
1973         }
1974         ext4_journal_stop(handle);
1975         return err;
1976 }
1977
1978 int ext4_convert_inline_data(struct inode *inode)
1979 {
1980         int error, needed_blocks, no_expand;
1981         handle_t *handle;
1982         struct ext4_iloc iloc;
1983
1984         if (!ext4_has_inline_data(inode)) {
1985                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1986                 return 0;
1987         }
1988
1989         needed_blocks = ext4_writepage_trans_blocks(inode);
1990
1991         iloc.bh = NULL;
1992         error = ext4_get_inode_loc(inode, &iloc);
1993         if (error)
1994                 return error;
1995
1996         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1997         if (IS_ERR(handle)) {
1998                 error = PTR_ERR(handle);
1999                 goto out_free;
2000         }
2001
2002         ext4_write_lock_xattr(inode, &no_expand);
2003         if (ext4_has_inline_data(inode))
2004                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2005         ext4_write_unlock_xattr(inode, &no_expand);
2006         ext4_journal_stop(handle);
2007 out_free:
2008         brelse(iloc.bh);
2009         return error;
2010 }