fs/ext4/inline.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (c) 2012 Taobao.
   4  * Written by Tao Ma <[email protected]>
   5  */
   6
   7 #include <linux/iomap.h>
   8 #include <linux/fiemap.h>
   9 #include <linux/iversion.h>
  10
  11 #include "ext4_jbd2.h"
  12 #include "ext4.h"
  13 #include "xattr.h"
  14 #include "truncate.h"
  15
  16 #define EXT4_XATTR_SYSTEM_DATA  "data"
  17 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  18 #define EXT4_INLINE_DOTDOT_OFFSET       2
  19 #define EXT4_INLINE_DOTDOT_SIZE         4
  20
  21 static int ext4_get_inline_size(struct inode *inode)
  22 {
  23         if (EXT4_I(inode)->i_inline_off)
  24                 return EXT4_I(inode)->i_inline_size;
  25
  26         return 0;
  27 }
  28
  29 static int get_max_inline_xattr_value_size(struct inode *inode,
  30                                            struct ext4_iloc *iloc)
  31 {
  32         struct ext4_xattr_ibody_header *header;
  33         struct ext4_xattr_entry *entry;
  34         struct ext4_inode *raw_inode;
  35         int free, min_offs;
  36
  37         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  38                         EXT4_GOOD_OLD_INODE_SIZE -
  39                         EXT4_I(inode)->i_extra_isize -
  40                         sizeof(struct ext4_xattr_ibody_header);
  41
  42         /*
  43          * We need to subtract another sizeof(__u32) since an in-inode xattr
  44          * needs an empty 4 bytes to indicate the gap between the xattr entry
  45          * and the name/value pair.
  46          */
  47         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  48                 return EXT4_XATTR_SIZE(min_offs -
  49                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  50                         EXT4_XATTR_ROUND - sizeof(__u32));
  51
  52         raw_inode = ext4_raw_inode(iloc);
  53         header = IHDR(inode, raw_inode);
  54         entry = IFIRST(header);
  55
  56         /* Compute min_offs. */
  57         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  58                 if (!entry->e_value_inum && entry->e_value_size) {
  59                         size_t offs = le16_to_cpu(entry->e_value_offs);
  60                         if (offs < min_offs)
  61                                 min_offs = offs;
  62                 }
  63         }
  64         free = min_offs -
  65                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  66
  67         if (EXT4_I(inode)->i_inline_off) {
  68                 entry = (struct ext4_xattr_entry *)
  69                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  70
  71                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  72                 goto out;
  73         }
  74
  75         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  76
  77         if (free > EXT4_XATTR_ROUND)
  78                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  79         else
  80                 free = 0;
  81
  82 out:
  83         return free;
  84 }
  85
  86 /*
  87  * Get the maximum size we now can store in an inode.
  88  * If we can't find the space for a xattr entry, don't use the space
  89  * of the extents since we have no space to indicate the inline data.
  90  */
  91 int ext4_get_max_inline_size(struct inode *inode)
  92 {
  93         int error, max_inline_size;
  94         struct ext4_iloc iloc;
  95
  96         if (EXT4_I(inode)->i_extra_isize == 0)
  97                 return 0;
  98
  99         error = ext4_get_inode_loc(inode, &iloc);
 100         if (error) {
 101                 ext4_error_inode(inode, __func__, __LINE__, 0,
 102                                  "can't get inode location %lu",
 103                                  inode->i_ino);
 104                 return 0;
 105         }
 106
 107         down_read(&EXT4_I(inode)->xattr_sem);
 108         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 109         up_read(&EXT4_I(inode)->xattr_sem);
 110
 111         brelse(iloc.bh);
 112
 113         if (!max_inline_size)
 114                 return 0;
 115
 116         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 117 }
 118
 119 /*
 120  * this function does not take xattr_sem, which is OK because it is
 121  * currently only used in a code path coming form ext4_iget, before
 122  * the new inode has been unlocked
 123  */
 124 int ext4_find_inline_data_nolock(struct inode *inode)
 125 {
 126         struct ext4_xattr_ibody_find is = {
 127                 .s = { .not_found = -ENODATA, },
 128         };
 129         struct ext4_xattr_info i = {
 130                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 131                 .name = EXT4_XATTR_SYSTEM_DATA,
 132         };
 133         int error;
 134
 135         if (EXT4_I(inode)->i_extra_isize == 0)
 136                 return 0;
 137
 138         error = ext4_get_inode_loc(inode, &is.iloc);
 139         if (error)
 140                 return error;
 141
 142         error = ext4_xattr_ibody_find(inode, &i, &is);
 143         if (error)
 144                 goto out;
 145
 146         if (!is.s.not_found) {
 147                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 148                                         (void *)ext4_raw_inode(&is.iloc));
 149                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 150                                 le32_to_cpu(is.s.here->e_value_size);
 151                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 152         }
 153 out:
 154         brelse(is.iloc.bh);
 155         return error;
 156 }
 157
 158 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 159                                  unsigned int len,
 160                                  struct ext4_iloc *iloc)
 161 {
 162         struct ext4_xattr_entry *entry;
 163         struct ext4_xattr_ibody_header *header;
 164         int cp_len = 0;
 165         struct ext4_inode *raw_inode;
 166
 167         if (!len)
 168                 return 0;
 169
 170         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 171
 172         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 173                         len : EXT4_MIN_INLINE_DATA_SIZE;
 174
 175         raw_inode = ext4_raw_inode(iloc);
 176         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 177
 178         len -= cp_len;
 179         buffer += cp_len;
 180
 181         if (!len)
 182                 goto out;
 183
 184         header = IHDR(inode, raw_inode);
 185         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 186                                             EXT4_I(inode)->i_inline_off);
 187         len = min_t(unsigned int, len,
 188                     (unsigned int)le32_to_cpu(entry->e_value_size));
 189
 190         memcpy(buffer,
 191                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 192         cp_len += len;
 193
 194 out:
 195         return cp_len;
 196 }
 197
 198 /*
 199  * write the buffer to the inline inode.
 200  * If 'create' is set, we don't need to do the extra copy in the xattr
 201  * value since it is already handled by ext4_xattr_ibody_inline_set.
 202  * That saves us one memcpy.
 203  */
 204 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 205                                    void *buffer, loff_t pos, unsigned int len)
 206 {
 207         struct ext4_xattr_entry *entry;
 208         struct ext4_xattr_ibody_header *header;
 209         struct ext4_inode *raw_inode;
 210         int cp_len = 0;
 211
 212         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 213                 return;
 214
 215         BUG_ON(!EXT4_I(inode)->i_inline_off);
 216         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 217
 218         raw_inode = ext4_raw_inode(iloc);
 219         buffer += pos;
 220
 221         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 222                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 223                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 224                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 225
 226                 len -= cp_len;
 227                 buffer += cp_len;
 228                 pos += cp_len;
 229         }
 230
 231         if (!len)
 232                 return;
 233
 234         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 235         header = IHDR(inode, raw_inode);
 236         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 237                                             EXT4_I(inode)->i_inline_off);
 238
 239         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 240                buffer, len);
 241 }
 242
 243 static int ext4_create_inline_data(handle_t *handle,
 244                                    struct inode *inode, unsigned len)
 245 {
 246         int error;
 247         void *value = NULL;
 248         struct ext4_xattr_ibody_find is = {
 249                 .s = { .not_found = -ENODATA, },
 250         };
 251         struct ext4_xattr_info i = {
 252                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 253                 .name = EXT4_XATTR_SYSTEM_DATA,
 254         };
 255
 256         error = ext4_get_inode_loc(inode, &is.iloc);
 257         if (error)
 258                 return error;
 259
 260         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 261         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 262         if (error)
 263                 goto out;
 264
 265         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 266                 value = EXT4_ZERO_XATTR_VALUE;
 267                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 268         } else {
 269                 value = "";
 270                 len = 0;
 271         }
 272
 273         /* Insert the the xttr entry. */
 274         i.value = value;
 275         i.value_len = len;
 276
 277         error = ext4_xattr_ibody_find(inode, &i, &is);
 278         if (error)
 279                 goto out;
 280
 281         BUG_ON(!is.s.not_found);
 282
 283         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 284         if (error) {
 285                 if (error == -ENOSPC)
 286                         ext4_clear_inode_state(inode,
 287                                                EXT4_STATE_MAY_INLINE_DATA);
 288                 goto out;
 289         }
 290
 291         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 292                 0, EXT4_MIN_INLINE_DATA_SIZE);
 293
 294         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 295                                       (void *)ext4_raw_inode(&is.iloc));
 296         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 297         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 298         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 299         get_bh(is.iloc.bh);
 300         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 301
 302 out:
 303         brelse(is.iloc.bh);
 304         return error;
 305 }
 306
 307 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 308                                    unsigned int len)
 309 {
 310         int error;
 311         void *value = NULL;
 312         struct ext4_xattr_ibody_find is = {
 313                 .s = { .not_found = -ENODATA, },
 314         };
 315         struct ext4_xattr_info i = {
 316                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 317                 .name = EXT4_XATTR_SYSTEM_DATA,
 318         };
 319
 320         /* If the old space is ok, write the data directly. */
 321         if (len <= EXT4_I(inode)->i_inline_size)
 322                 return 0;
 323
 324         error = ext4_get_inode_loc(inode, &is.iloc);
 325         if (error)
 326                 return error;
 327
 328         error = ext4_xattr_ibody_find(inode, &i, &is);
 329         if (error)
 330                 goto out;
 331
 332         BUG_ON(is.s.not_found);
 333
 334         len -= EXT4_MIN_INLINE_DATA_SIZE;
 335         value = kzalloc(len, GFP_NOFS);
 336         if (!value) {
 337                 error = -ENOMEM;
 338                 goto out;
 339         }
 340
 341         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 342                                      value, len);
 343         if (error == -ENODATA)
 344                 goto out;
 345
 346         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 347         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 348         if (error)
 349                 goto out;
 350
 351         /* Update the xttr entry. */
 352         i.value = value;
 353         i.value_len = len;
 354
 355         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 356         if (error)
 357                 goto out;
 358
 359         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 360                                       (void *)ext4_raw_inode(&is.iloc));
 361         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 362                                 le32_to_cpu(is.s.here->e_value_size);
 363         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 364         get_bh(is.iloc.bh);
 365         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 366
 367 out:
 368         kfree(value);
 369         brelse(is.iloc.bh);
 370         return error;
 371 }
 372
 373 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 374                                     unsigned int len)
 375 {
 376         int ret, size, no_expand;
 377         struct ext4_inode_info *ei = EXT4_I(inode);
 378
 379         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 380                 return -ENOSPC;
 381
 382         size = ext4_get_max_inline_size(inode);
 383         if (size < len)
 384                 return -ENOSPC;
 385
 386         ext4_write_lock_xattr(inode, &no_expand);
 387
 388         if (ei->i_inline_off)
 389                 ret = ext4_update_inline_data(handle, inode, len);
 390         else
 391                 ret = ext4_create_inline_data(handle, inode, len);
 392
 393         ext4_write_unlock_xattr(inode, &no_expand);
 394         return ret;
 395 }
 396
 397 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 398                                            struct inode *inode)
 399 {
 400         struct ext4_inode_info *ei = EXT4_I(inode);
 401         struct ext4_xattr_ibody_find is = {
 402                 .s = { .not_found = 0, },
 403         };
 404         struct ext4_xattr_info i = {
 405                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 406                 .name = EXT4_XATTR_SYSTEM_DATA,
 407                 .value = NULL,
 408                 .value_len = 0,
 409         };
 410         int error;
 411
 412         if (!ei->i_inline_off)
 413                 return 0;
 414
 415         error = ext4_get_inode_loc(inode, &is.iloc);
 416         if (error)
 417                 return error;
 418
 419         error = ext4_xattr_ibody_find(inode, &i, &is);
 420         if (error)
 421                 goto out;
 422
 423         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 424         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 425         if (error)
 426                 goto out;
 427
 428         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 429         if (error)
 430                 goto out;
 431
 432         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 433                 0, EXT4_MIN_INLINE_DATA_SIZE);
 434
 435         if (ext4_has_feature_extents(inode->i_sb)) {
 436                 if (S_ISDIR(inode->i_mode) ||
 437                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 438                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 439                         ext4_ext_tree_init(handle, inode);
 440                 }
 441         }
 442         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 443
 444         get_bh(is.iloc.bh);
 445         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 446
 447         EXT4_I(inode)->i_inline_off = 0;
 448         EXT4_I(inode)->i_inline_size = 0;
 449         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 450 out:
 451         brelse(is.iloc.bh);
 452         if (error == -ENODATA)
 453                 error = 0;
 454         return error;
 455 }
 456
 457 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 458 {
 459         void *kaddr;
 460         int ret = 0;
 461         size_t len;
 462         struct ext4_iloc iloc;
 463
 464         BUG_ON(!PageLocked(page));
 465         BUG_ON(!ext4_has_inline_data(inode));
 466         BUG_ON(page->index);
 467
 468         if (!EXT4_I(inode)->i_inline_off) {
 469                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 470                              inode->i_ino);
 471                 goto out;
 472         }
 473
 474         ret = ext4_get_inode_loc(inode, &iloc);
 475         if (ret)
 476                 goto out;
 477
 478         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 479         kaddr = kmap_atomic(page);
 480         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 481         flush_dcache_page(page);
 482         kunmap_atomic(kaddr);
 483         zero_user_segment(page, len, PAGE_SIZE);
 484         SetPageUptodate(page);
 485         brelse(iloc.bh);
 486
 487 out:
 488         return ret;
 489 }
 490
 491 int ext4_readpage_inline(struct inode *inode, struct page *page)
 492 {
 493         int ret = 0;
 494
 495         down_read(&EXT4_I(inode)->xattr_sem);
 496         if (!ext4_has_inline_data(inode)) {
 497                 up_read(&EXT4_I(inode)->xattr_sem);
 498                 return -EAGAIN;
 499         }
 500
 501         /*
 502          * Current inline data can only exist in the 1st page,
 503          * So for all the other pages, just set them uptodate.
 504          */
 505         if (!page->index)
 506                 ret = ext4_read_inline_page(inode, page);
 507         else if (!PageUptodate(page)) {
 508                 zero_user_segment(page, 0, PAGE_SIZE);
 509                 SetPageUptodate(page);
 510         }
 511
 512         up_read(&EXT4_I(inode)->xattr_sem);
 513
 514         unlock_page(page);
 515         return ret >= 0 ? 0 : ret;
 516 }
 517
 518 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 519                                               struct inode *inode,
 520                                               unsigned flags)
 521 {
 522         int ret, needed_blocks, no_expand;
 523         handle_t *handle = NULL;
 524         int retries = 0, sem_held = 0;
 525         struct page *page = NULL;
 526         unsigned from, to;
 527         struct ext4_iloc iloc;
 528
 529         if (!ext4_has_inline_data(inode)) {
 530                 /*
 531                  * clear the flag so that no new write
 532                  * will trap here again.
 533                  */
 534                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 535                 return 0;
 536         }
 537
 538         needed_blocks = ext4_writepage_trans_blocks(inode);
 539
 540         ret = ext4_get_inode_loc(inode, &iloc);
 541         if (ret)
 542                 return ret;
 543
 544 retry:
 545         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 546         if (IS_ERR(handle)) {
 547                 ret = PTR_ERR(handle);
 548                 handle = NULL;
 549                 goto out;
 550         }
 551
 552         /* We cannot recurse into the filesystem as the transaction is already
 553          * started */
 554         flags |= AOP_FLAG_NOFS;
 555
 556         page = grab_cache_page_write_begin(mapping, 0, flags);
 557         if (!page) {
 558                 ret = -ENOMEM;
 559                 goto out;
 560         }
 561
 562         ext4_write_lock_xattr(inode, &no_expand);
 563         sem_held = 1;
 564         /* If some one has already done this for us, just exit. */
 565         if (!ext4_has_inline_data(inode)) {
 566                 ret = 0;
 567                 goto out;
 568         }
 569
 570         from = 0;
 571         to = ext4_get_inline_size(inode);
 572         if (!PageUptodate(page)) {
 573                 ret = ext4_read_inline_page(inode, page);
 574                 if (ret < 0)
 575                         goto out;
 576         }
 577
 578         ret = ext4_destroy_inline_data_nolock(handle, inode);
 579         if (ret)
 580                 goto out;
 581
 582         if (ext4_should_dioread_nolock(inode)) {
 583                 ret = __block_write_begin(page, from, to,
 584                                           ext4_get_block_unwritten);
 585         } else
 586                 ret = __block_write_begin(page, from, to, ext4_get_block);
 587
 588         if (!ret && ext4_should_journal_data(inode)) {
 589                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 590                                              from, to, NULL,
 591                                              do_journal_get_write_access);
 592         }
 593
 594         if (ret) {
 595                 unlock_page(page);
 596                 put_page(page);
 597                 page = NULL;
 598                 ext4_orphan_add(handle, inode);
 599                 ext4_write_unlock_xattr(inode, &no_expand);
 600                 sem_held = 0;
 601                 ext4_journal_stop(handle);
 602                 handle = NULL;
 603                 ext4_truncate_failed_write(inode);
 604                 /*
 605                  * If truncate failed early the inode might
 606                  * still be on the orphan list; we need to
 607                  * make sure the inode is removed from the
 608                  * orphan list in that case.
 609                  */
 610                 if (inode->i_nlink)
 611                         ext4_orphan_del(NULL, inode);
 612         }
 613
 614         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 615                 goto retry;
 616
 617         if (page)
 618                 block_commit_write(page, from, to);
 619 out:
 620         if (page) {
 621                 unlock_page(page);
 622                 put_page(page);
 623         }
 624         if (sem_held)
 625                 ext4_write_unlock_xattr(inode, &no_expand);
 626         if (handle)
 627                 ext4_journal_stop(handle);
 628         brelse(iloc.bh);
 629         return ret;
 630 }
 631
 632 /*
 633  * Try to write data in the inode.
 634  * If the inode has inline data, check whether the new write can be
 635  * in the inode also. If not, create the page the handle, move the data
 636  * to the page make it update and let the later codes create extent for it.
 637  */
 638 int ext4_try_to_write_inline_data(struct address_space *mapping,
 639                                   struct inode *inode,
 640                                   loff_t pos, unsigned len,
 641                                   unsigned flags,
 642                                   struct page **pagep)
 643 {
 644         int ret;
 645         handle_t *handle;
 646         struct page *page;
 647         struct ext4_iloc iloc;
 648
 649         if (pos + len > ext4_get_max_inline_size(inode))
 650                 goto convert;
 651
 652         ret = ext4_get_inode_loc(inode, &iloc);
 653         if (ret)
 654                 return ret;
 655
 656         /*
 657          * The possible write could happen in the inode,
 658          * so try to reserve the space in inode first.
 659          */
 660         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 661         if (IS_ERR(handle)) {
 662                 ret = PTR_ERR(handle);
 663                 handle = NULL;
 664                 goto out;
 665         }
 666
 667         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 668         if (ret && ret != -ENOSPC)
 669                 goto out;
 670
 671         /* We don't have space in inline inode, so convert it to extent. */
 672         if (ret == -ENOSPC) {
 673                 ext4_journal_stop(handle);
 674                 brelse(iloc.bh);
 675                 goto convert;
 676         }
 677
 678         flags |= AOP_FLAG_NOFS;
 679
 680         page = grab_cache_page_write_begin(mapping, 0, flags);
 681         if (!page) {
 682                 ret = -ENOMEM;
 683                 goto out;
 684         }
 685
 686         *pagep = page;
 687         down_read(&EXT4_I(inode)->xattr_sem);
 688         if (!ext4_has_inline_data(inode)) {
 689                 ret = 0;
 690                 unlock_page(page);
 691                 put_page(page);
 692                 goto out_up_read;
 693         }
 694
 695         if (!PageUptodate(page)) {
 696                 ret = ext4_read_inline_page(inode, page);
 697                 if (ret < 0)
 698                         goto out_up_read;
 699         }
 700
 701         ret = 1;
 702         handle = NULL;
 703 out_up_read:
 704         up_read(&EXT4_I(inode)->xattr_sem);
 705 out:
 706         if (handle)
 707                 ext4_journal_stop(handle);
 708         brelse(iloc.bh);
 709         return ret;
 710 convert:
 711         return ext4_convert_inline_data_to_extent(mapping,
 712                                                   inode, flags);
 713 }
 714
 715 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 716                                unsigned copied, struct page *page)
 717 {
 718         int ret, no_expand;
 719         void *kaddr;
 720         struct ext4_iloc iloc;
 721
 722         if (unlikely(copied < len)) {
 723                 if (!PageUptodate(page)) {
 724                         copied = 0;
 725                         goto out;
 726                 }
 727         }
 728
 729         ret = ext4_get_inode_loc(inode, &iloc);
 730         if (ret) {
 731                 ext4_std_error(inode->i_sb, ret);
 732                 copied = 0;
 733                 goto out;
 734         }
 735
 736         ext4_write_lock_xattr(inode, &no_expand);
 737         BUG_ON(!ext4_has_inline_data(inode));
 738
 739         kaddr = kmap_atomic(page);
 740         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 741         kunmap_atomic(kaddr);
 742         SetPageUptodate(page);
 743         /* clear page dirty so that writepages wouldn't work for us. */
 744         ClearPageDirty(page);
 745
 746         ext4_write_unlock_xattr(inode, &no_expand);
 747         brelse(iloc.bh);
 748 out:
 749         return copied;
 750 }
 751
 752 struct buffer_head *
 753 ext4_journalled_write_inline_data(struct inode *inode,
 754                                   unsigned len,
 755                                   struct page *page)
 756 {
 757         int ret, no_expand;
 758         void *kaddr;
 759         struct ext4_iloc iloc;
 760
 761         ret = ext4_get_inode_loc(inode, &iloc);
 762         if (ret) {
 763                 ext4_std_error(inode->i_sb, ret);
 764                 return NULL;
 765         }
 766
 767         ext4_write_lock_xattr(inode, &no_expand);
 768         kaddr = kmap_atomic(page);
 769         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 770         kunmap_atomic(kaddr);
 771         ext4_write_unlock_xattr(inode, &no_expand);
 772
 773         return iloc.bh;
 774 }
 775
 776 /*
 777  * Try to make the page cache and handle ready for the inline data case.
 778  * We can call this function in 2 cases:
 779  * 1. The inode is created and the first write exceeds inline size. We can
 780  *    clear the inode state safely.
 781  * 2. The inode has inline data, then we need to read the data, make it
 782  *    update and dirty so that ext4_da_writepages can handle it. We don't
 783  *    need to start the journal since the file's metatdata isn't changed now.
 784  */
 785 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 786                                                  struct inode *inode,
 787                                                  unsigned flags,
 788                                                  void **fsdata)
 789 {
 790         int ret = 0, inline_size;
 791         struct page *page;
 792
 793         page = grab_cache_page_write_begin(mapping, 0, flags);
 794         if (!page)
 795                 return -ENOMEM;
 796
 797         down_read(&EXT4_I(inode)->xattr_sem);
 798         if (!ext4_has_inline_data(inode)) {
 799                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 800                 goto out;
 801         }
 802
 803         inline_size = ext4_get_inline_size(inode);
 804
 805         if (!PageUptodate(page)) {
 806                 ret = ext4_read_inline_page(inode, page);
 807                 if (ret < 0)
 808                         goto out;
 809         }
 810
 811         ret = __block_write_begin(page, 0, inline_size,
 812                                   ext4_da_get_block_prep);
 813         if (ret) {
 814                 up_read(&EXT4_I(inode)->xattr_sem);
 815                 unlock_page(page);
 816                 put_page(page);
 817                 ext4_truncate_failed_write(inode);
 818                 return ret;
 819         }
 820
 821         SetPageDirty(page);
 822         SetPageUptodate(page);
 823         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 824         *fsdata = (void *)CONVERT_INLINE_DATA;
 825
 826 out:
 827         up_read(&EXT4_I(inode)->xattr_sem);
 828         if (page) {
 829                 unlock_page(page);
 830                 put_page(page);
 831         }
 832         return ret;
 833 }
 834
 835 /*
 836  * Prepare the write for the inline data.
 837  * If the the data can be written into the inode, we just read
 838  * the page and make it uptodate, and start the journal.
 839  * Otherwise read the page, makes it dirty so that it can be
 840  * handle in writepages(the i_disksize update is left to the
 841  * normal ext4_da_write_end).
 842  */
 843 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 844                                     struct inode *inode,
 845                                     loff_t pos, unsigned len,
 846                                     unsigned flags,
 847                                     struct page **pagep,
 848                                     void **fsdata)
 849 {
 850         int ret, inline_size;
 851         handle_t *handle;
 852         struct page *page;
 853         struct ext4_iloc iloc;
 854         int retries;
 855
 856         ret = ext4_get_inode_loc(inode, &iloc);
 857         if (ret)
 858                 return ret;
 859
 860 retry_journal:
 861         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 862         if (IS_ERR(handle)) {
 863                 ret = PTR_ERR(handle);
 864                 goto out;
 865         }
 866
 867         inline_size = ext4_get_max_inline_size(inode);
 868
 869         ret = -ENOSPC;
 870         if (inline_size >= pos + len) {
 871                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 872                 if (ret && ret != -ENOSPC)
 873                         goto out_journal;
 874         }
 875
 876         /*
 877          * We cannot recurse into the filesystem as the transaction
 878          * is already started.
 879          */
 880         flags |= AOP_FLAG_NOFS;
 881
 882         if (ret == -ENOSPC) {
 883                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 884                                                             inode,
 885                                                             flags,
 886                                                             fsdata);
 887                 ext4_journal_stop(handle);
 888                 if (ret == -ENOSPC &&
 889                     ext4_should_retry_alloc(inode->i_sb, &retries))
 890                         goto retry_journal;
 891                 goto out;
 892         }
 893
 894
 895         page = grab_cache_page_write_begin(mapping, 0, flags);
 896         if (!page) {
 897                 ret = -ENOMEM;
 898                 goto out_journal;
 899         }
 900
 901         down_read(&EXT4_I(inode)->xattr_sem);
 902         if (!ext4_has_inline_data(inode)) {
 903                 ret = 0;
 904                 goto out_release_page;
 905         }
 906
 907         if (!PageUptodate(page)) {
 908                 ret = ext4_read_inline_page(inode, page);
 909                 if (ret < 0)
 910                         goto out_release_page;
 911         }
 912
 913         up_read(&EXT4_I(inode)->xattr_sem);
 914         *pagep = page;
 915         brelse(iloc.bh);
 916         return 1;
 917 out_release_page:
 918         up_read(&EXT4_I(inode)->xattr_sem);
 919         unlock_page(page);
 920         put_page(page);
 921 out_journal:
 922         ext4_journal_stop(handle);
 923 out:
 924         brelse(iloc.bh);
 925         return ret;
 926 }
 927
 928 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 929                                   unsigned len, unsigned copied,
 930                                   struct page *page)
 931 {
 932         int i_size_changed = 0;
 933         int ret;
 934
 935         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 936         if (ret < 0) {
 937                 unlock_page(page);
 938                 put_page(page);
 939                 return ret;
 940         }
 941         copied = ret;
 942
 943         /*
 944          * No need to use i_size_read() here, the i_size
 945          * cannot change under us because we hold i_mutex.
 946          *
 947          * But it's important to update i_size while still holding page lock:
 948          * page writeout could otherwise come in and zero beyond i_size.
 949          */
 950         if (pos+copied > inode->i_size) {
 951                 i_size_write(inode, pos+copied);
 952                 i_size_changed = 1;
 953         }
 954         unlock_page(page);
 955         put_page(page);
 956
 957         /*
 958          * Don't mark the inode dirty under page lock. First, it unnecessarily
 959          * makes the holding time of page lock longer. Second, it forces lock
 960          * ordering of page lock and transaction start for journaling
 961          * filesystems.
 962          */
 963         if (i_size_changed)
 964                 mark_inode_dirty(inode);
 965
 966         return copied;
 967 }
 968
 969 #ifdef INLINE_DIR_DEBUG
 970 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 971                           void *inline_start, int inline_size)
 972 {
 973         int offset;
 974         unsigned short de_len;
 975         struct ext4_dir_entry_2 *de = inline_start;
 976         void *dlimit = inline_start + inline_size;
 977
 978         trace_printk("inode %lu\n", dir->i_ino);
 979         offset = 0;
 980         while ((void *)de < dlimit) {
 981                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 982                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 983                              offset, de_len, de->name_len, de->name,
 984                              de->name_len, le32_to_cpu(de->inode));
 985                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 986                                          inline_start, inline_size, offset))
 987                         BUG();
 988
 989                 offset += de_len;
 990                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 991         }
 992 }
 993 #else
 994 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 995 #endif
 996
 997 /*
 998  * Add a new entry into a inline dir.
 999  * It will return -ENOSPC if no space is available, and -EIO
1000  * and -EEXIST if directory entry already exists.
1001  */
1002 static int ext4_add_dirent_to_inline(handle_t *handle,
1003                                      struct ext4_filename *fname,
1004                                      struct inode *dir,
1005                                      struct inode *inode,
1006                                      struct ext4_iloc *iloc,
1007                                      void *inline_start, int inline_size)
1008 {
1009         int             err;
1010         struct ext4_dir_entry_2 *de;
1011
1012         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1013                                 inline_size, fname, &de);
1014         if (err)
1015                 return err;
1016
1017         BUFFER_TRACE(iloc->bh, "get_write_access");
1018         err = ext4_journal_get_write_access(handle, iloc->bh);
1019         if (err)
1020                 return err;
1021         ext4_insert_dentry(inode, de, inline_size, fname);
1022
1023         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1024
1025         /*
1026          * XXX shouldn't update any times until successful
1027          * completion of syscall, but too many callers depend
1028          * on this.
1029          *
1030          * XXX similarly, too many callers depend on
1031          * ext4_new_inode() setting the times, but error
1032          * recovery deletes the inode, so the worst that can
1033          * happen is that the times are slightly out of date
1034          * and/or different from the directory change time.
1035          */
1036         dir->i_mtime = dir->i_ctime = current_time(dir);
1037         ext4_update_dx_flag(dir);
1038         inode_inc_iversion(dir);
1039         return 1;
1040 }
1041
1042 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1043                                        struct ext4_iloc *iloc)
1044 {
1045         struct ext4_xattr_entry *entry;
1046         struct ext4_xattr_ibody_header *header;
1047
1048         BUG_ON(!EXT4_I(inode)->i_inline_off);
1049
1050         header = IHDR(inode, ext4_raw_inode(iloc));
1051         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1052                                             EXT4_I(inode)->i_inline_off);
1053
1054         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1055 }
1056
1057 /* Set the final de to cover the whole block. */
1058 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1059 {
1060         struct ext4_dir_entry_2 *de, *prev_de;
1061         void *limit;
1062         int de_len;
1063
1064         de = (struct ext4_dir_entry_2 *)de_buf;
1065         if (old_size) {
1066                 limit = de_buf + old_size;
1067                 do {
1068                         prev_de = de;
1069                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1070                         de_buf += de_len;
1071                         de = (struct ext4_dir_entry_2 *)de_buf;
1072                 } while (de_buf < limit);
1073
1074                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1075                                                         old_size, new_size);
1076         } else {
1077                 /* this is just created, so create an empty entry. */
1078                 de->inode = 0;
1079                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1080         }
1081 }
1082
1083 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1084                                   struct ext4_iloc *iloc)
1085 {
1086         int ret;
1087         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1088         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1089
1090         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1091                 return -ENOSPC;
1092
1093         ret = ext4_update_inline_data(handle, dir,
1094                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1095         if (ret)
1096                 return ret;
1097
1098         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1099                              EXT4_I(dir)->i_inline_size -
1100                                                 EXT4_MIN_INLINE_DATA_SIZE);
1101         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1102         return 0;
1103 }
1104
1105 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1106                                      struct ext4_iloc *iloc,
1107                                      void *buf, int inline_size)
1108 {
1109         ext4_create_inline_data(handle, inode, inline_size);
1110         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1111         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1112 }
1113
1114 static int ext4_finish_convert_inline_dir(handle_t *handle,
1115                                           struct inode *inode,
1116                                           struct buffer_head *dir_block,
1117                                           void *buf,
1118                                           int inline_size)
1119 {
1120         int err, csum_size = 0, header_size = 0;
1121         struct ext4_dir_entry_2 *de;
1122         struct ext4_dir_entry_tail *t;
1123         void *target = dir_block->b_data;
1124
1125         /*
1126          * First create "." and ".." and then copy the dir information
1127          * back to the block.
1128          */
1129         de = (struct ext4_dir_entry_2 *)target;
1130         de = ext4_init_dot_dotdot(inode, de,
1131                 inode->i_sb->s_blocksize, csum_size,
1132                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1133         header_size = (void *)de - target;
1134
1135         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1136                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1137
1138         if (ext4_has_metadata_csum(inode->i_sb))
1139                 csum_size = sizeof(struct ext4_dir_entry_tail);
1140
1141         inode->i_size = inode->i_sb->s_blocksize;
1142         i_size_write(inode, inode->i_sb->s_blocksize);
1143         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1144         ext4_update_final_de(dir_block->b_data,
1145                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1146                         inode->i_sb->s_blocksize - csum_size);
1147
1148         if (csum_size) {
1149                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1150                                      inode->i_sb->s_blocksize);
1151                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1152         }
1153         set_buffer_uptodate(dir_block);
1154         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1155         if (err)
1156                 return err;
1157         set_buffer_verified(dir_block);
1158         return ext4_mark_inode_dirty(handle, inode);
1159 }
1160
1161 static int ext4_convert_inline_data_nolock(handle_t *handle,
1162                                            struct inode *inode,
1163                                            struct ext4_iloc *iloc)
1164 {
1165         int error;
1166         void *buf = NULL;
1167         struct buffer_head *data_bh = NULL;
1168         struct ext4_map_blocks map;
1169         int inline_size;
1170
1171         inline_size = ext4_get_inline_size(inode);
1172         buf = kmalloc(inline_size, GFP_NOFS);
1173         if (!buf) {
1174                 error = -ENOMEM;
1175                 goto out;
1176         }
1177
1178         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1179         if (error < 0)
1180                 goto out;
1181
1182         /*
1183          * Make sure the inline directory entries pass checks before we try to
1184          * convert them, so that we avoid touching stuff that needs fsck.
1185          */
1186         if (S_ISDIR(inode->i_mode)) {
1187                 error = ext4_check_all_de(inode, iloc->bh,
1188                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1189                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1190                 if (error)
1191                         goto out;
1192         }
1193
1194         error = ext4_destroy_inline_data_nolock(handle, inode);
1195         if (error)
1196                 goto out;
1197
1198         map.m_lblk = 0;
1199         map.m_len = 1;
1200         map.m_flags = 0;
1201         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1202         if (error < 0)
1203                 goto out_restore;
1204         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1205                 error = -EIO;
1206                 goto out_restore;
1207         }
1208
1209         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1210         if (!data_bh) {
1211                 error = -ENOMEM;
1212                 goto out_restore;
1213         }
1214
1215         lock_buffer(data_bh);
1216         error = ext4_journal_get_create_access(handle, data_bh);
1217         if (error) {
1218                 unlock_buffer(data_bh);
1219                 error = -EIO;
1220                 goto out_restore;
1221         }
1222         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1223
1224         if (!S_ISDIR(inode->i_mode)) {
1225                 memcpy(data_bh->b_data, buf, inline_size);
1226                 set_buffer_uptodate(data_bh);
1227                 error = ext4_handle_dirty_metadata(handle,
1228                                                    inode, data_bh);
1229         } else {
1230                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1231                                                        buf, inline_size);
1232         }
1233
1234         unlock_buffer(data_bh);
1235 out_restore:
1236         if (error)
1237                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1238
1239 out:
1240         brelse(data_bh);
1241         kfree(buf);
1242         return error;
1243 }
1244
1245 /*
1246  * Try to add the new entry to the inline data.
1247  * If succeeds, return 0. If not, extended the inline dir and copied data to
1248  * the new created block.
1249  */
1250 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1251                               struct inode *dir, struct inode *inode)
1252 {
1253         int ret, inline_size, no_expand;
1254         void *inline_start;
1255         struct ext4_iloc iloc;
1256
1257         ret = ext4_get_inode_loc(dir, &iloc);
1258         if (ret)
1259                 return ret;
1260
1261         ext4_write_lock_xattr(dir, &no_expand);
1262         if (!ext4_has_inline_data(dir))
1263                 goto out;
1264
1265         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1266                                                  EXT4_INLINE_DOTDOT_SIZE;
1267         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1268
1269         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1270                                         inline_start, inline_size);
1271         if (ret != -ENOSPC)
1272                 goto out;
1273
1274         /* check whether it can be inserted to inline xattr space. */
1275         inline_size = EXT4_I(dir)->i_inline_size -
1276                         EXT4_MIN_INLINE_DATA_SIZE;
1277         if (!inline_size) {
1278                 /* Try to use the xattr space.*/
1279                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1280                 if (ret && ret != -ENOSPC)
1281                         goto out;
1282
1283                 inline_size = EXT4_I(dir)->i_inline_size -
1284                                 EXT4_MIN_INLINE_DATA_SIZE;
1285         }
1286
1287         if (inline_size) {
1288                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1289
1290                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1291                                                 inode, &iloc, inline_start,
1292                                                 inline_size);
1293
1294                 if (ret != -ENOSPC)
1295                         goto out;
1296         }
1297
1298         /*
1299          * The inline space is filled up, so create a new block for it.
1300          * As the extent tree will be created, we have to save the inline
1301          * dir first.
1302          */
1303         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1304
1305 out:
1306         ext4_write_unlock_xattr(dir, &no_expand);
1307         ext4_mark_inode_dirty(handle, dir);
1308         brelse(iloc.bh);
1309         return ret;
1310 }
1311
1312 /*
1313  * This function fills a red-black tree with information from an
1314  * inlined dir.  It returns the number directory entries loaded
1315  * into the tree.  If there is an error it is returned in err.
1316  */
1317 int htree_inlinedir_to_tree(struct file *dir_file,
1318                             struct inode *dir, ext4_lblk_t block,
1319                             struct dx_hash_info *hinfo,
1320                             __u32 start_hash, __u32 start_minor_hash,
1321                             int *has_inline_data)
1322 {
1323         int err = 0, count = 0;
1324         unsigned int parent_ino;
1325         int pos;
1326         struct ext4_dir_entry_2 *de;
1327         struct inode *inode = file_inode(dir_file);
1328         int ret, inline_size = 0;
1329         struct ext4_iloc iloc;
1330         void *dir_buf = NULL;
1331         struct ext4_dir_entry_2 fake;
1332         struct fscrypt_str tmp_str;
1333
1334         ret = ext4_get_inode_loc(inode, &iloc);
1335         if (ret)
1336                 return ret;
1337
1338         down_read(&EXT4_I(inode)->xattr_sem);
1339         if (!ext4_has_inline_data(inode)) {
1340                 up_read(&EXT4_I(inode)->xattr_sem);
1341                 *has_inline_data = 0;
1342                 goto out;
1343         }
1344
1345         inline_size = ext4_get_inline_size(inode);
1346         dir_buf = kmalloc(inline_size, GFP_NOFS);
1347         if (!dir_buf) {
1348                 ret = -ENOMEM;
1349                 up_read(&EXT4_I(inode)->xattr_sem);
1350                 goto out;
1351         }
1352
1353         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1354         up_read(&EXT4_I(inode)->xattr_sem);
1355         if (ret < 0)
1356                 goto out;
1357
1358         pos = 0;
1359         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1360         while (pos < inline_size) {
1361                 /*
1362                  * As inlined dir doesn't store any information about '.' and
1363                  * only the inode number of '..' is stored, we have to handle
1364                  * them differently.
1365                  */
1366                 if (pos == 0) {
1367                         fake.inode = cpu_to_le32(inode->i_ino);
1368                         fake.name_len = 1;
1369                         strcpy(fake.name, ".");
1370                         fake.rec_len = ext4_rec_len_to_disk(
1371                                                 EXT4_DIR_REC_LEN(fake.name_len),
1372                                                 inline_size);
1373                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1374                         de = &fake;
1375                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1376                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1377                         fake.inode = cpu_to_le32(parent_ino);
1378                         fake.name_len = 2;
1379                         strcpy(fake.name, "..");
1380                         fake.rec_len = ext4_rec_len_to_disk(
1381                                                 EXT4_DIR_REC_LEN(fake.name_len),
1382                                                 inline_size);
1383                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1384                         de = &fake;
1385                         pos = EXT4_INLINE_DOTDOT_SIZE;
1386                 } else {
1387                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1388                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1389                         if (ext4_check_dir_entry(inode, dir_file, de,
1390                                          iloc.bh, dir_buf,
1391                                          inline_size, pos)) {
1392                                 ret = count;
1393                                 goto out;
1394                         }
1395                 }
1396
1397                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1398                 if ((hinfo->hash < start_hash) ||
1399                     ((hinfo->hash == start_hash) &&
1400                      (hinfo->minor_hash < start_minor_hash)))
1401                         continue;
1402                 if (de->inode == 0)
1403                         continue;
1404                 tmp_str.name = de->name;
1405                 tmp_str.len = de->name_len;
1406                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1407                                               hinfo->minor_hash, de, &tmp_str);
1408                 if (err) {
1409                         count = err;
1410                         goto out;
1411                 }
1412                 count++;
1413         }
1414         ret = count;
1415 out:
1416         kfree(dir_buf);
1417         brelse(iloc.bh);
1418         return ret;
1419 }
1420
1421 /*
1422  * So this function is called when the volume is mkfsed with
1423  * dir_index disabled. In order to keep f_pos persistent
1424  * after we convert from an inlined dir to a blocked based,
1425  * we just pretend that we are a normal dir and return the
1426  * offset as if '.' and '..' really take place.
1427  *
1428  */
1429 int ext4_read_inline_dir(struct file *file,
1430                          struct dir_context *ctx,
1431                          int *has_inline_data)
1432 {
1433         unsigned int offset, parent_ino;
1434         int i;
1435         struct ext4_dir_entry_2 *de;
1436         struct super_block *sb;
1437         struct inode *inode = file_inode(file);
1438         int ret, inline_size = 0;
1439         struct ext4_iloc iloc;
1440         void *dir_buf = NULL;
1441         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1442
1443         ret = ext4_get_inode_loc(inode, &iloc);
1444         if (ret)
1445                 return ret;
1446
1447         down_read(&EXT4_I(inode)->xattr_sem);
1448         if (!ext4_has_inline_data(inode)) {
1449                 up_read(&EXT4_I(inode)->xattr_sem);
1450                 *has_inline_data = 0;
1451                 goto out;
1452         }
1453
1454         inline_size = ext4_get_inline_size(inode);
1455         dir_buf = kmalloc(inline_size, GFP_NOFS);
1456         if (!dir_buf) {
1457                 ret = -ENOMEM;
1458                 up_read(&EXT4_I(inode)->xattr_sem);
1459                 goto out;
1460         }
1461
1462         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1463         up_read(&EXT4_I(inode)->xattr_sem);
1464         if (ret < 0)
1465                 goto out;
1466
1467         ret = 0;
1468         sb = inode->i_sb;
1469         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1470         offset = ctx->pos;
1471
1472         /*
1473          * dotdot_offset and dotdot_size is the real offset and
1474          * size for ".." and "." if the dir is block based while
1475          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1476          * So we will use extra_offset and extra_size to indicate them
1477          * during the inline dir iteration.
1478          */
1479         dotdot_offset = EXT4_DIR_REC_LEN(1);
1480         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1481         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1482         extra_size = extra_offset + inline_size;
1483
1484         /*
1485          * If the version has changed since the last call to
1486          * readdir(2), then we might be pointing to an invalid
1487          * dirent right now.  Scan from the start of the inline
1488          * dir to make sure.
1489          */
1490         if (!inode_eq_iversion(inode, file->f_version)) {
1491                 for (i = 0; i < extra_size && i < offset;) {
1492                         /*
1493                          * "." is with offset 0 and
1494                          * ".." is dotdot_offset.
1495                          */
1496                         if (!i) {
1497                                 i = dotdot_offset;
1498                                 continue;
1499                         } else if (i == dotdot_offset) {
1500                                 i = dotdot_size;
1501                                 continue;
1502                         }
1503                         /* for other entry, the real offset in
1504                          * the buf has to be tuned accordingly.
1505                          */
1506                         de = (struct ext4_dir_entry_2 *)
1507                                 (dir_buf + i - extra_offset);
1508                         /* It's too expensive to do a full
1509                          * dirent test each time round this
1510                          * loop, but we do have to test at
1511                          * least that it is non-zero.  A
1512                          * failure will be detected in the
1513                          * dirent test below. */
1514                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1515                                 < EXT4_DIR_REC_LEN(1))
1516                                 break;
1517                         i += ext4_rec_len_from_disk(de->rec_len,
1518                                                     extra_size);
1519                 }
1520                 offset = i;
1521                 ctx->pos = offset;
1522                 file->f_version = inode_query_iversion(inode);
1523         }
1524
1525         while (ctx->pos < extra_size) {
1526                 if (ctx->pos == 0) {
1527                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1528                                 goto out;
1529                         ctx->pos = dotdot_offset;
1530                         continue;
1531                 }
1532
1533                 if (ctx->pos == dotdot_offset) {
1534                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1535                                 goto out;
1536                         ctx->pos = dotdot_size;
1537                         continue;
1538                 }
1539
1540                 de = (struct ext4_dir_entry_2 *)
1541                         (dir_buf + ctx->pos - extra_offset);
1542                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1543                                          extra_size, ctx->pos))
1544                         goto out;
1545                 if (le32_to_cpu(de->inode)) {
1546                         if (!dir_emit(ctx, de->name, de->name_len,
1547                                       le32_to_cpu(de->inode),
1548                                       get_dtype(sb, de->file_type)))
1549                                 goto out;
1550                 }
1551                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1552         }
1553 out:
1554         kfree(dir_buf);
1555         brelse(iloc.bh);
1556         return ret;
1557 }
1558
1559 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1560                                         struct ext4_dir_entry_2 **parent_de,
1561                                         int *retval)
1562 {
1563         struct ext4_iloc iloc;
1564
1565         *retval = ext4_get_inode_loc(inode, &iloc);
1566         if (*retval)
1567                 return NULL;
1568
1569         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1570
1571         return iloc.bh;
1572 }
1573
1574 /*
1575  * Try to create the inline data for the new dir.
1576  * If it succeeds, return 0, otherwise return the error.
1577  * In case of ENOSPC, the caller should create the normal disk layout dir.
1578  */
1579 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1580                                struct inode *inode)
1581 {
1582         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1583         struct ext4_iloc iloc;
1584         struct ext4_dir_entry_2 *de;
1585
1586         ret = ext4_get_inode_loc(inode, &iloc);
1587         if (ret)
1588                 return ret;
1589
1590         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1591         if (ret)
1592                 goto out;
1593
1594         /*
1595          * For inline dir, we only save the inode information for the ".."
1596          * and create a fake dentry to cover the left space.
1597          */
1598         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1599         de->inode = cpu_to_le32(parent->i_ino);
1600         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1601         de->inode = 0;
1602         de->rec_len = ext4_rec_len_to_disk(
1603                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1604                                 inline_size);
1605         set_nlink(inode, 2);
1606         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1607 out:
1608         brelse(iloc.bh);
1609         return ret;
1610 }
1611
1612 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1613                                         struct ext4_filename *fname,
1614                                         struct ext4_dir_entry_2 **res_dir,
1615                                         int *has_inline_data)
1616 {
1617         int ret;
1618         struct ext4_iloc iloc;
1619         void *inline_start;
1620         int inline_size;
1621
1622         if (ext4_get_inode_loc(dir, &iloc))
1623                 return NULL;
1624
1625         down_read(&EXT4_I(dir)->xattr_sem);
1626         if (!ext4_has_inline_data(dir)) {
1627                 *has_inline_data = 0;
1628                 goto out;
1629         }
1630
1631         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1632                                                 EXT4_INLINE_DOTDOT_SIZE;
1633         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1634         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1635                               dir, fname, 0, res_dir);
1636         if (ret == 1)
1637                 goto out_find;
1638         if (ret < 0)
1639                 goto out;
1640
1641         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1642                 goto out;
1643
1644         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1645         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1646
1647         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1648                               dir, fname, 0, res_dir);
1649         if (ret == 1)
1650                 goto out_find;
1651
1652 out:
1653         brelse(iloc.bh);
1654         iloc.bh = NULL;
1655 out_find:
1656         up_read(&EXT4_I(dir)->xattr_sem);
1657         return iloc.bh;
1658 }
1659
1660 int ext4_delete_inline_entry(handle_t *handle,
1661                              struct inode *dir,
1662                              struct ext4_dir_entry_2 *de_del,
1663                              struct buffer_head *bh,
1664                              int *has_inline_data)
1665 {
1666         int err, inline_size, no_expand;
1667         struct ext4_iloc iloc;
1668         void *inline_start;
1669
1670         err = ext4_get_inode_loc(dir, &iloc);
1671         if (err)
1672                 return err;
1673
1674         ext4_write_lock_xattr(dir, &no_expand);
1675         if (!ext4_has_inline_data(dir)) {
1676                 *has_inline_data = 0;
1677                 goto out;
1678         }
1679
1680         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1681                 EXT4_MIN_INLINE_DATA_SIZE) {
1682                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1683                                         EXT4_INLINE_DOTDOT_SIZE;
1684                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1685                                 EXT4_INLINE_DOTDOT_SIZE;
1686         } else {
1687                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1688                 inline_size = ext4_get_inline_size(dir) -
1689                                 EXT4_MIN_INLINE_DATA_SIZE;
1690         }
1691
1692         BUFFER_TRACE(bh, "get_write_access");
1693         err = ext4_journal_get_write_access(handle, bh);
1694         if (err)
1695                 goto out;
1696
1697         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1698                                         inline_start, inline_size, 0);
1699         if (err)
1700                 goto out;
1701
1702         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1703 out:
1704         ext4_write_unlock_xattr(dir, &no_expand);
1705         if (likely(err == 0))
1706                 err = ext4_mark_inode_dirty(handle, dir);
1707         brelse(iloc.bh);
1708         if (err != -ENOENT)
1709                 ext4_std_error(dir->i_sb, err);
1710         return err;
1711 }
1712
1713 /*
1714  * Get the inline dentry at offset.
1715  */
1716 static inline struct ext4_dir_entry_2 *
1717 ext4_get_inline_entry(struct inode *inode,
1718                       struct ext4_iloc *iloc,
1719                       unsigned int offset,
1720                       void **inline_start,
1721                       int *inline_size)
1722 {
1723         void *inline_pos;
1724
1725         BUG_ON(offset > ext4_get_inline_size(inode));
1726
1727         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1728                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1729                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1730         } else {
1731                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1732                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1733                 *inline_size = ext4_get_inline_size(inode) -
1734                                 EXT4_MIN_INLINE_DATA_SIZE;
1735         }
1736
1737         if (inline_start)
1738                 *inline_start = inline_pos;
1739         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1740 }
1741
1742 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1743 {
1744         int err, inline_size;
1745         struct ext4_iloc iloc;
1746         void *inline_pos;
1747         unsigned int offset;
1748         struct ext4_dir_entry_2 *de;
1749         bool ret = true;
1750
1751         err = ext4_get_inode_loc(dir, &iloc);
1752         if (err) {
1753                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1754                                  err, dir->i_ino);
1755                 return true;
1756         }
1757
1758         down_read(&EXT4_I(dir)->xattr_sem);
1759         if (!ext4_has_inline_data(dir)) {
1760                 *has_inline_data = 0;
1761                 goto out;
1762         }
1763
1764         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1765         if (!le32_to_cpu(de->inode)) {
1766                 ext4_warning(dir->i_sb,
1767                              "bad inline directory (dir #%lu) - no `..'",
1768                              dir->i_ino);
1769                 ret = true;
1770                 goto out;
1771         }
1772
1773         offset = EXT4_INLINE_DOTDOT_SIZE;
1774         while (offset < dir->i_size) {
1775                 de = ext4_get_inline_entry(dir, &iloc, offset,
1776                                            &inline_pos, &inline_size);
1777                 if (ext4_check_dir_entry(dir, NULL, de,
1778                                          iloc.bh, inline_pos,
1779                                          inline_size, offset)) {
1780                         ext4_warning(dir->i_sb,
1781                                      "bad inline directory (dir #%lu) - "
1782                                      "inode %u, rec_len %u, name_len %d"
1783                                      "inline size %d",
1784                                      dir->i_ino, le32_to_cpu(de->inode),
1785                                      le16_to_cpu(de->rec_len), de->name_len,
1786                                      inline_size);
1787                         ret = true;
1788                         goto out;
1789                 }
1790                 if (le32_to_cpu(de->inode)) {
1791                         ret = false;
1792                         goto out;
1793                 }
1794                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1795         }
1796
1797 out:
1798         up_read(&EXT4_I(dir)->xattr_sem);
1799         brelse(iloc.bh);
1800         return ret;
1801 }
1802
1803 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1804 {
1805         int ret, no_expand;
1806
1807         ext4_write_lock_xattr(inode, &no_expand);
1808         ret = ext4_destroy_inline_data_nolock(handle, inode);
1809         ext4_write_unlock_xattr(inode, &no_expand);
1810
1811         return ret;
1812 }
1813
1814 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1815 {
1816         __u64 addr;
1817         int error = -EAGAIN;
1818         struct ext4_iloc iloc;
1819
1820         down_read(&EXT4_I(inode)->xattr_sem);
1821         if (!ext4_has_inline_data(inode))
1822                 goto out;
1823
1824         error = ext4_get_inode_loc(inode, &iloc);
1825         if (error)
1826                 goto out;
1827
1828         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1829         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1830         addr += offsetof(struct ext4_inode, i_block);
1831
1832         brelse(iloc.bh);
1833
1834         iomap->addr = addr;
1835         iomap->offset = 0;
1836         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1837                               i_size_read(inode));
1838         iomap->type = 0;
1839         iomap->flags = IOMAP_F_DATA_INLINE;
1840
1841 out:
1842         up_read(&EXT4_I(inode)->xattr_sem);
1843         return error;
1844 }
1845
1846 int ext4_inline_data_fiemap(struct inode *inode,
1847                             struct fiemap_extent_info *fieinfo,
1848                             int *has_inline, __u64 start, __u64 len)
1849 {
1850         __u64 physical = 0;
1851         __u64 inline_len;
1852         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1853                 FIEMAP_EXTENT_LAST;
1854         int error = 0;
1855         struct ext4_iloc iloc;
1856
1857         down_read(&EXT4_I(inode)->xattr_sem);
1858         if (!ext4_has_inline_data(inode)) {
1859                 *has_inline = 0;
1860                 goto out;
1861         }
1862         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1863                            i_size_read(inode));
1864         if (start >= inline_len)
1865                 goto out;
1866         if (start + len < inline_len)
1867                 inline_len = start + len;
1868         inline_len -= start;
1869
1870         error = ext4_get_inode_loc(inode, &iloc);
1871         if (error)
1872                 goto out;
1873
1874         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1875         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1876         physical += offsetof(struct ext4_inode, i_block);
1877
1878         if (physical)
1879                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1880                                                 inline_len, flags);
1881         brelse(iloc.bh);
1882 out:
1883         up_read(&EXT4_I(inode)->xattr_sem);
1884         return (error < 0 ? error : 0);
1885 }
1886
1887 /*
1888  * Called during xattr set, and if we can sparse space 'needed',
1889  * just create the extent tree evict the data to the outer block.
1890  *
1891  * We use jbd2 instead of page cache to move data to the 1st block
1892  * so that the whole transaction can be committed as a whole and
1893  * the data isn't lost because of the delayed page cache write.
1894  */
1895 int ext4_try_to_evict_inline_data(handle_t *handle,
1896                                   struct inode *inode,
1897                                   int needed)
1898 {
1899         int error;
1900         struct ext4_xattr_entry *entry;
1901         struct ext4_inode *raw_inode;
1902         struct ext4_iloc iloc;
1903
1904         error = ext4_get_inode_loc(inode, &iloc);
1905         if (error)
1906                 return error;
1907
1908         raw_inode = ext4_raw_inode(&iloc);
1909         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1910                                             EXT4_I(inode)->i_inline_off);
1911         if (EXT4_XATTR_LEN(entry->e_name_len) +
1912             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1913                 error = -ENOSPC;
1914                 goto out;
1915         }
1916
1917         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1918 out:
1919         brelse(iloc.bh);
1920         return error;
1921 }
1922
1923 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1924 {
1925         handle_t *handle;
1926         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1927         size_t i_size;
1928         void *value = NULL;
1929         struct ext4_xattr_ibody_find is = {
1930                 .s = { .not_found = -ENODATA, },
1931         };
1932         struct ext4_xattr_info i = {
1933                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1934                 .name = EXT4_XATTR_SYSTEM_DATA,
1935         };
1936
1937
1938         needed_blocks = ext4_writepage_trans_blocks(inode);
1939         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1940         if (IS_ERR(handle))
1941                 return PTR_ERR(handle);
1942
1943         ext4_write_lock_xattr(inode, &no_expand);
1944         if (!ext4_has_inline_data(inode)) {
1945                 *has_inline = 0;
1946                 ext4_journal_stop(handle);
1947                 return 0;
1948         }
1949
1950         if ((err = ext4_orphan_add(handle, inode)) != 0)
1951                 goto out;
1952
1953         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1954                 goto out;
1955
1956         down_write(&EXT4_I(inode)->i_data_sem);
1957         i_size = inode->i_size;
1958         inline_size = ext4_get_inline_size(inode);
1959         EXT4_I(inode)->i_disksize = i_size;
1960
1961         if (i_size < inline_size) {
1962                 /* Clear the content in the xattr space. */
1963                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1964                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1965                                 goto out_error;
1966
1967                         BUG_ON(is.s.not_found);
1968
1969                         value_len = le32_to_cpu(is.s.here->e_value_size);
1970                         value = kmalloc(value_len, GFP_NOFS);
1971                         if (!value) {
1972                                 err = -ENOMEM;
1973                                 goto out_error;
1974                         }
1975
1976                         err = ext4_xattr_ibody_get(inode, i.name_index,
1977                                                    i.name, value, value_len);
1978                         if (err <= 0)
1979                                 goto out_error;
1980
1981                         i.value = value;
1982                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1983                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1984                         err = ext4_xattr_ibody_inline_set(handle, inode,
1985                                                           &i, &is);
1986                         if (err)
1987                                 goto out_error;
1988                 }
1989
1990                 /* Clear the content within i_blocks. */
1991                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1992                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1993                         memset(p + i_size, 0,
1994                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1995                 }
1996
1997                 EXT4_I(inode)->i_inline_size = i_size <
1998                                         EXT4_MIN_INLINE_DATA_SIZE ?
1999                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
2000         }
2001
2002 out_error:
2003         up_write(&EXT4_I(inode)->i_data_sem);
2004 out:
2005         brelse(is.iloc.bh);
2006         ext4_write_unlock_xattr(inode, &no_expand);
2007         kfree(value);
2008         if (inode->i_nlink)
2009                 ext4_orphan_del(handle, inode);
2010
2011         if (err == 0) {
2012                 inode->i_mtime = inode->i_ctime = current_time(inode);
2013                 err = ext4_mark_inode_dirty(handle, inode);
2014                 if (IS_SYNC(inode))
2015                         ext4_handle_sync(handle);
2016         }
2017         ext4_journal_stop(handle);
2018         return err;
2019 }
2020
2021 int ext4_convert_inline_data(struct inode *inode)
2022 {
2023         int error, needed_blocks, no_expand;
2024         handle_t *handle;
2025         struct ext4_iloc iloc;
2026
2027         if (!ext4_has_inline_data(inode)) {
2028                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2029                 return 0;
2030         }
2031
2032         needed_blocks = ext4_writepage_trans_blocks(inode);
2033
2034         iloc.bh = NULL;
2035         error = ext4_get_inode_loc(inode, &iloc);
2036         if (error)
2037                 return error;
2038
2039         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2040         if (IS_ERR(handle)) {
2041                 error = PTR_ERR(handle);
2042                 goto out_free;
2043         }
2044
2045         ext4_write_lock_xattr(inode, &no_expand);
2046         if (ext4_has_inline_data(inode))
2047                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2048         ext4_write_unlock_xattr(inode, &no_expand);
2049         ext4_journal_stop(handle);
2050 out_free:
2051         brelse(iloc.bh);
2052         return error;
2053 }