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 #include <linux/backing-dev.h>
  11
  12 #include "ext4_jbd2.h"
  13 #include "ext4.h"
  14 #include "xattr.h"
  15 #include "truncate.h"
  16
  17 #define EXT4_XATTR_SYSTEM_DATA  "data"
  18 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  19 #define EXT4_INLINE_DOTDOT_OFFSET       2
  20 #define EXT4_INLINE_DOTDOT_SIZE         4
  21
  22 static int ext4_get_inline_size(struct inode *inode)
  23 {
  24         if (EXT4_I(inode)->i_inline_off)
  25                 return EXT4_I(inode)->i_inline_size;
  26
  27         return 0;
  28 }
  29
  30 static int get_max_inline_xattr_value_size(struct inode *inode,
  31                                            struct ext4_iloc *iloc)
  32 {
  33         struct ext4_xattr_ibody_header *header;
  34         struct ext4_xattr_entry *entry;
  35         struct ext4_inode *raw_inode;
  36         int free, min_offs;
  37
  38         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  39                         EXT4_GOOD_OLD_INODE_SIZE -
  40                         EXT4_I(inode)->i_extra_isize -
  41                         sizeof(struct ext4_xattr_ibody_header);
  42
  43         /*
  44          * We need to subtract another sizeof(__u32) since an in-inode xattr
  45          * needs an empty 4 bytes to indicate the gap between the xattr entry
  46          * and the name/value pair.
  47          */
  48         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  49                 return EXT4_XATTR_SIZE(min_offs -
  50                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  51                         EXT4_XATTR_ROUND - sizeof(__u32));
  52
  53         raw_inode = ext4_raw_inode(iloc);
  54         header = IHDR(inode, raw_inode);
  55         entry = IFIRST(header);
  56
  57         /* Compute min_offs. */
  58         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  59                 if (!entry->e_value_inum && entry->e_value_size) {
  60                         size_t offs = le16_to_cpu(entry->e_value_offs);
  61                         if (offs < min_offs)
  62                                 min_offs = offs;
  63                 }
  64         }
  65         free = min_offs -
  66                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  67
  68         if (EXT4_I(inode)->i_inline_off) {
  69                 entry = (struct ext4_xattr_entry *)
  70                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  71
  72                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  73                 goto out;
  74         }
  75
  76         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  77
  78         if (free > EXT4_XATTR_ROUND)
  79                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  80         else
  81                 free = 0;
  82
  83 out:
  84         return free;
  85 }
  86
  87 /*
  88  * Get the maximum size we now can store in an inode.
  89  * If we can't find the space for a xattr entry, don't use the space
  90  * of the extents since we have no space to indicate the inline data.
  91  */
  92 int ext4_get_max_inline_size(struct inode *inode)
  93 {
  94         int error, max_inline_size;
  95         struct ext4_iloc iloc;
  96
  97         if (EXT4_I(inode)->i_extra_isize == 0)
  98                 return 0;
  99
 100         error = ext4_get_inode_loc(inode, &iloc);
 101         if (error) {
 102                 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
 103                                      "can't get inode location %lu",
 104                                      inode->i_ino);
 105                 return 0;
 106         }
 107
 108         down_read(&EXT4_I(inode)->xattr_sem);
 109         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 110         up_read(&EXT4_I(inode)->xattr_sem);
 111
 112         brelse(iloc.bh);
 113
 114         if (!max_inline_size)
 115                 return 0;
 116
 117         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 118 }
 119
 120 /*
 121  * this function does not take xattr_sem, which is OK because it is
 122  * currently only used in a code path coming form ext4_iget, before
 123  * the new inode has been unlocked
 124  */
 125 int ext4_find_inline_data_nolock(struct inode *inode)
 126 {
 127         struct ext4_xattr_ibody_find is = {
 128                 .s = { .not_found = -ENODATA, },
 129         };
 130         struct ext4_xattr_info i = {
 131                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 132                 .name = EXT4_XATTR_SYSTEM_DATA,
 133         };
 134         int error;
 135
 136         if (EXT4_I(inode)->i_extra_isize == 0)
 137                 return 0;
 138
 139         error = ext4_get_inode_loc(inode, &is.iloc);
 140         if (error)
 141                 return error;
 142
 143         error = ext4_xattr_ibody_find(inode, &i, &is);
 144         if (error)
 145                 goto out;
 146
 147         if (!is.s.not_found) {
 148                 if (is.s.here->e_value_inum) {
 149                         EXT4_ERROR_INODE(inode, "inline data xattr refers "
 150                                          "to an external xattr inode");
 151                         error = -EFSCORRUPTED;
 152                         goto out;
 153                 }
 154                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 155                                         (void *)ext4_raw_inode(&is.iloc));
 156                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 157                                 le32_to_cpu(is.s.here->e_value_size);
 158                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 159         }
 160 out:
 161         brelse(is.iloc.bh);
 162         return error;
 163 }
 164
 165 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 166                                  unsigned int len,
 167                                  struct ext4_iloc *iloc)
 168 {
 169         struct ext4_xattr_entry *entry;
 170         struct ext4_xattr_ibody_header *header;
 171         int cp_len = 0;
 172         struct ext4_inode *raw_inode;
 173
 174         if (!len)
 175                 return 0;
 176
 177         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 178
 179         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 180                         len : EXT4_MIN_INLINE_DATA_SIZE;
 181
 182         raw_inode = ext4_raw_inode(iloc);
 183         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 184
 185         len -= cp_len;
 186         buffer += cp_len;
 187
 188         if (!len)
 189                 goto out;
 190
 191         header = IHDR(inode, raw_inode);
 192         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 193                                             EXT4_I(inode)->i_inline_off);
 194         len = min_t(unsigned int, len,
 195                     (unsigned int)le32_to_cpu(entry->e_value_size));
 196
 197         memcpy(buffer,
 198                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 199         cp_len += len;
 200
 201 out:
 202         return cp_len;
 203 }
 204
 205 /*
 206  * write the buffer to the inline inode.
 207  * If 'create' is set, we don't need to do the extra copy in the xattr
 208  * value since it is already handled by ext4_xattr_ibody_set.
 209  * That saves us one memcpy.
 210  */
 211 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 212                                    void *buffer, loff_t pos, unsigned int len)
 213 {
 214         struct ext4_xattr_entry *entry;
 215         struct ext4_xattr_ibody_header *header;
 216         struct ext4_inode *raw_inode;
 217         int cp_len = 0;
 218
 219         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 220                 return;
 221
 222         BUG_ON(!EXT4_I(inode)->i_inline_off);
 223         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 224
 225         raw_inode = ext4_raw_inode(iloc);
 226         buffer += pos;
 227
 228         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 229                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 230                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 231                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 232
 233                 len -= cp_len;
 234                 buffer += cp_len;
 235                 pos += cp_len;
 236         }
 237
 238         if (!len)
 239                 return;
 240
 241         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 242         header = IHDR(inode, raw_inode);
 243         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 244                                             EXT4_I(inode)->i_inline_off);
 245
 246         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 247                buffer, len);
 248 }
 249
 250 static int ext4_create_inline_data(handle_t *handle,
 251                                    struct inode *inode, unsigned len)
 252 {
 253         int error;
 254         void *value = NULL;
 255         struct ext4_xattr_ibody_find is = {
 256                 .s = { .not_found = -ENODATA, },
 257         };
 258         struct ext4_xattr_info i = {
 259                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 260                 .name = EXT4_XATTR_SYSTEM_DATA,
 261         };
 262
 263         error = ext4_get_inode_loc(inode, &is.iloc);
 264         if (error)
 265                 return error;
 266
 267         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 268         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 269                                               EXT4_JTR_NONE);
 270         if (error)
 271                 goto out;
 272
 273         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 274                 value = EXT4_ZERO_XATTR_VALUE;
 275                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 276         } else {
 277                 value = "";
 278                 len = 0;
 279         }
 280
 281         /* Insert the xttr entry. */
 282         i.value = value;
 283         i.value_len = len;
 284
 285         error = ext4_xattr_ibody_find(inode, &i, &is);
 286         if (error)
 287                 goto out;
 288
 289         BUG_ON(!is.s.not_found);
 290
 291         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 292         if (error) {
 293                 if (error == -ENOSPC)
 294                         ext4_clear_inode_state(inode,
 295                                                EXT4_STATE_MAY_INLINE_DATA);
 296                 goto out;
 297         }
 298
 299         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 300                 0, EXT4_MIN_INLINE_DATA_SIZE);
 301
 302         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 303                                       (void *)ext4_raw_inode(&is.iloc));
 304         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 305         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 306         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 307         get_bh(is.iloc.bh);
 308         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 309
 310 out:
 311         brelse(is.iloc.bh);
 312         return error;
 313 }
 314
 315 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 316                                    unsigned int len)
 317 {
 318         int error;
 319         void *value = NULL;
 320         struct ext4_xattr_ibody_find is = {
 321                 .s = { .not_found = -ENODATA, },
 322         };
 323         struct ext4_xattr_info i = {
 324                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 325                 .name = EXT4_XATTR_SYSTEM_DATA,
 326         };
 327
 328         /* If the old space is ok, write the data directly. */
 329         if (len <= EXT4_I(inode)->i_inline_size)
 330                 return 0;
 331
 332         error = ext4_get_inode_loc(inode, &is.iloc);
 333         if (error)
 334                 return error;
 335
 336         error = ext4_xattr_ibody_find(inode, &i, &is);
 337         if (error)
 338                 goto out;
 339
 340         BUG_ON(is.s.not_found);
 341
 342         len -= EXT4_MIN_INLINE_DATA_SIZE;
 343         value = kzalloc(len, GFP_NOFS);
 344         if (!value) {
 345                 error = -ENOMEM;
 346                 goto out;
 347         }
 348
 349         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 350                                      value, len);
 351         if (error == -ENODATA)
 352                 goto out;
 353
 354         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 355         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 356                                               EXT4_JTR_NONE);
 357         if (error)
 358                 goto out;
 359
 360         /* Update the xattr entry. */
 361         i.value = value;
 362         i.value_len = len;
 363
 364         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 365         if (error)
 366                 goto out;
 367
 368         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 369                                       (void *)ext4_raw_inode(&is.iloc));
 370         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 371                                 le32_to_cpu(is.s.here->e_value_size);
 372         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 373         get_bh(is.iloc.bh);
 374         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 375
 376 out:
 377         kfree(value);
 378         brelse(is.iloc.bh);
 379         return error;
 380 }
 381
 382 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 383                                     unsigned int len)
 384 {
 385         int ret, size, no_expand;
 386         struct ext4_inode_info *ei = EXT4_I(inode);
 387
 388         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 389                 return -ENOSPC;
 390
 391         size = ext4_get_max_inline_size(inode);
 392         if (size < len)
 393                 return -ENOSPC;
 394
 395         ext4_write_lock_xattr(inode, &no_expand);
 396
 397         if (ei->i_inline_off)
 398                 ret = ext4_update_inline_data(handle, inode, len);
 399         else
 400                 ret = ext4_create_inline_data(handle, inode, len);
 401
 402         ext4_write_unlock_xattr(inode, &no_expand);
 403         return ret;
 404 }
 405
 406 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 407                                            struct inode *inode)
 408 {
 409         struct ext4_inode_info *ei = EXT4_I(inode);
 410         struct ext4_xattr_ibody_find is = {
 411                 .s = { .not_found = 0, },
 412         };
 413         struct ext4_xattr_info i = {
 414                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 415                 .name = EXT4_XATTR_SYSTEM_DATA,
 416                 .value = NULL,
 417                 .value_len = 0,
 418         };
 419         int error;
 420
 421         if (!ei->i_inline_off)
 422                 return 0;
 423
 424         error = ext4_get_inode_loc(inode, &is.iloc);
 425         if (error)
 426                 return error;
 427
 428         error = ext4_xattr_ibody_find(inode, &i, &is);
 429         if (error)
 430                 goto out;
 431
 432         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 433         error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
 434                                               EXT4_JTR_NONE);
 435         if (error)
 436                 goto out;
 437
 438         error = ext4_xattr_ibody_set(handle, inode, &i, &is);
 439         if (error)
 440                 goto out;
 441
 442         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 443                 0, EXT4_MIN_INLINE_DATA_SIZE);
 444         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 445
 446         if (ext4_has_feature_extents(inode->i_sb)) {
 447                 if (S_ISDIR(inode->i_mode) ||
 448                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 449                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 450                         ext4_ext_tree_init(handle, inode);
 451                 }
 452         }
 453         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 454
 455         get_bh(is.iloc.bh);
 456         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 457
 458         EXT4_I(inode)->i_inline_off = 0;
 459         EXT4_I(inode)->i_inline_size = 0;
 460         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 461 out:
 462         brelse(is.iloc.bh);
 463         if (error == -ENODATA)
 464                 error = 0;
 465         return error;
 466 }
 467
 468 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 469 {
 470         void *kaddr;
 471         int ret = 0;
 472         size_t len;
 473         struct ext4_iloc iloc;
 474
 475         BUG_ON(!PageLocked(page));
 476         BUG_ON(!ext4_has_inline_data(inode));
 477         BUG_ON(page->index);
 478
 479         if (!EXT4_I(inode)->i_inline_off) {
 480                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 481                              inode->i_ino);
 482                 goto out;
 483         }
 484
 485         ret = ext4_get_inode_loc(inode, &iloc);
 486         if (ret)
 487                 goto out;
 488
 489         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 490         kaddr = kmap_atomic(page);
 491         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 492         flush_dcache_page(page);
 493         kunmap_atomic(kaddr);
 494         zero_user_segment(page, len, PAGE_SIZE);
 495         SetPageUptodate(page);
 496         brelse(iloc.bh);
 497
 498 out:
 499         return ret;
 500 }
 501
 502 int ext4_readpage_inline(struct inode *inode, struct page *page)
 503 {
 504         int ret = 0;
 505
 506         down_read(&EXT4_I(inode)->xattr_sem);
 507         if (!ext4_has_inline_data(inode)) {
 508                 up_read(&EXT4_I(inode)->xattr_sem);
 509                 return -EAGAIN;
 510         }
 511
 512         /*
 513          * Current inline data can only exist in the 1st page,
 514          * So for all the other pages, just set them uptodate.
 515          */
 516         if (!page->index)
 517                 ret = ext4_read_inline_page(inode, page);
 518         else if (!PageUptodate(page)) {
 519                 zero_user_segment(page, 0, PAGE_SIZE);
 520                 SetPageUptodate(page);
 521         }
 522
 523         up_read(&EXT4_I(inode)->xattr_sem);
 524
 525         unlock_page(page);
 526         return ret >= 0 ? 0 : ret;
 527 }
 528
 529 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 530                                               struct inode *inode,
 531                                               unsigned flags)
 532 {
 533         int ret, needed_blocks, no_expand;
 534         handle_t *handle = NULL;
 535         int retries = 0, sem_held = 0;
 536         struct page *page = NULL;
 537         unsigned from, to;
 538         struct ext4_iloc iloc;
 539
 540         if (!ext4_has_inline_data(inode)) {
 541                 /*
 542                  * clear the flag so that no new write
 543                  * will trap here again.
 544                  */
 545                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 546                 return 0;
 547         }
 548
 549         needed_blocks = ext4_writepage_trans_blocks(inode);
 550
 551         ret = ext4_get_inode_loc(inode, &iloc);
 552         if (ret)
 553                 return ret;
 554
 555 retry:
 556         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 557         if (IS_ERR(handle)) {
 558                 ret = PTR_ERR(handle);
 559                 handle = NULL;
 560                 goto out;
 561         }
 562
 563         /* We cannot recurse into the filesystem as the transaction is already
 564          * started */
 565         flags |= AOP_FLAG_NOFS;
 566
 567         page = grab_cache_page_write_begin(mapping, 0, flags);
 568         if (!page) {
 569                 ret = -ENOMEM;
 570                 goto out;
 571         }
 572
 573         ext4_write_lock_xattr(inode, &no_expand);
 574         sem_held = 1;
 575         /* If some one has already done this for us, just exit. */
 576         if (!ext4_has_inline_data(inode)) {
 577                 ret = 0;
 578                 goto out;
 579         }
 580
 581         from = 0;
 582         to = ext4_get_inline_size(inode);
 583         if (!PageUptodate(page)) {
 584                 ret = ext4_read_inline_page(inode, page);
 585                 if (ret < 0)
 586                         goto out;
 587         }
 588
 589         ret = ext4_destroy_inline_data_nolock(handle, inode);
 590         if (ret)
 591                 goto out;
 592
 593         if (ext4_should_dioread_nolock(inode)) {
 594                 ret = __block_write_begin(page, from, to,
 595                                           ext4_get_block_unwritten);
 596         } else
 597                 ret = __block_write_begin(page, from, to, ext4_get_block);
 598
 599         if (!ret && ext4_should_journal_data(inode)) {
 600                 ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
 601                                              from, to, NULL,
 602                                              do_journal_get_write_access);
 603         }
 604
 605         if (ret) {
 606                 unlock_page(page);
 607                 put_page(page);
 608                 page = NULL;
 609                 ext4_orphan_add(handle, inode);
 610                 ext4_write_unlock_xattr(inode, &no_expand);
 611                 sem_held = 0;
 612                 ext4_journal_stop(handle);
 613                 handle = NULL;
 614                 ext4_truncate_failed_write(inode);
 615                 /*
 616                  * If truncate failed early the inode might
 617                  * still be on the orphan list; we need to
 618                  * make sure the inode is removed from the
 619                  * orphan list in that case.
 620                  */
 621                 if (inode->i_nlink)
 622                         ext4_orphan_del(NULL, inode);
 623         }
 624
 625         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 626                 goto retry;
 627
 628         if (page)
 629                 block_commit_write(page, from, to);
 630 out:
 631         if (page) {
 632                 unlock_page(page);
 633                 put_page(page);
 634         }
 635         if (sem_held)
 636                 ext4_write_unlock_xattr(inode, &no_expand);
 637         if (handle)
 638                 ext4_journal_stop(handle);
 639         brelse(iloc.bh);
 640         return ret;
 641 }
 642
 643 /*
 644  * Try to write data in the inode.
 645  * If the inode has inline data, check whether the new write can be
 646  * in the inode also. If not, create the page the handle, move the data
 647  * to the page make it update and let the later codes create extent for it.
 648  */
 649 int ext4_try_to_write_inline_data(struct address_space *mapping,
 650                                   struct inode *inode,
 651                                   loff_t pos, unsigned len,
 652                                   unsigned flags,
 653                                   struct page **pagep)
 654 {
 655         int ret;
 656         handle_t *handle;
 657         struct page *page;
 658         struct ext4_iloc iloc;
 659
 660         if (pos + len > ext4_get_max_inline_size(inode))
 661                 goto convert;
 662
 663         ret = ext4_get_inode_loc(inode, &iloc);
 664         if (ret)
 665                 return ret;
 666
 667         /*
 668          * The possible write could happen in the inode,
 669          * so try to reserve the space in inode first.
 670          */
 671         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 672         if (IS_ERR(handle)) {
 673                 ret = PTR_ERR(handle);
 674                 handle = NULL;
 675                 goto out;
 676         }
 677
 678         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 679         if (ret && ret != -ENOSPC)
 680                 goto out;
 681
 682         /* We don't have space in inline inode, so convert it to extent. */
 683         if (ret == -ENOSPC) {
 684                 ext4_journal_stop(handle);
 685                 brelse(iloc.bh);
 686                 goto convert;
 687         }
 688
 689         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 690                                             EXT4_JTR_NONE);
 691         if (ret)
 692                 goto out;
 693
 694         flags |= AOP_FLAG_NOFS;
 695
 696         page = grab_cache_page_write_begin(mapping, 0, flags);
 697         if (!page) {
 698                 ret = -ENOMEM;
 699                 goto out;
 700         }
 701
 702         *pagep = page;
 703         down_read(&EXT4_I(inode)->xattr_sem);
 704         if (!ext4_has_inline_data(inode)) {
 705                 ret = 0;
 706                 unlock_page(page);
 707                 put_page(page);
 708                 goto out_up_read;
 709         }
 710
 711         if (!PageUptodate(page)) {
 712                 ret = ext4_read_inline_page(inode, page);
 713                 if (ret < 0) {
 714                         unlock_page(page);
 715                         put_page(page);
 716                         goto out_up_read;
 717                 }
 718         }
 719
 720         ret = 1;
 721         handle = NULL;
 722 out_up_read:
 723         up_read(&EXT4_I(inode)->xattr_sem);
 724 out:
 725         if (handle && (ret != 1))
 726                 ext4_journal_stop(handle);
 727         brelse(iloc.bh);
 728         return ret;
 729 convert:
 730         return ext4_convert_inline_data_to_extent(mapping,
 731                                                   inode, flags);
 732 }
 733
 734 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 735                                unsigned copied, struct page *page)
 736 {
 737         handle_t *handle = ext4_journal_current_handle();
 738         int no_expand;
 739         void *kaddr;
 740         struct ext4_iloc iloc;
 741         int ret = 0, ret2;
 742
 743         if (unlikely(copied < len) && !PageUptodate(page))
 744                 copied = 0;
 745
 746         if (likely(copied)) {
 747                 ret = ext4_get_inode_loc(inode, &iloc);
 748                 if (ret) {
 749                         unlock_page(page);
 750                         put_page(page);
 751                         ext4_std_error(inode->i_sb, ret);
 752                         goto out;
 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
 759                  * ext4_write_begin() called
 760                  * ext4_try_to_write_inline_data()
 761                  */
 762                 (void) ext4_find_inline_data_nolock(inode);
 763
 764                 kaddr = kmap_atomic(page);
 765                 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
 766                 kunmap_atomic(kaddr);
 767                 SetPageUptodate(page);
 768                 /* clear page dirty so that writepages wouldn't work for us. */
 769                 ClearPageDirty(page);
 770
 771                 ext4_write_unlock_xattr(inode, &no_expand);
 772                 brelse(iloc.bh);
 773
 774                 /*
 775                  * It's important to update i_size while still holding page
 776                  * lock: page writeout could otherwise come in and zero
 777                  * beyond i_size.
 778                  */
 779                 ext4_update_inode_size(inode, pos + copied);
 780         }
 781         unlock_page(page);
 782         put_page(page);
 783
 784         /*
 785          * Don't mark the inode dirty under page lock. First, it unnecessarily
 786          * makes the holding time of page lock longer. Second, it forces lock
 787          * ordering of page lock and transaction start for journaling
 788          * filesystems.
 789          */
 790         if (likely(copied))
 791                 mark_inode_dirty(inode);
 792 out:
 793         /*
 794          * If we didn't copy as much data as expected, we need to trim back
 795          * size of xattr containing inline data.
 796          */
 797         if (pos + len > inode->i_size && ext4_can_truncate(inode))
 798                 ext4_orphan_add(handle, inode);
 799
 800         ret2 = ext4_journal_stop(handle);
 801         if (!ret)
 802                 ret = ret2;
 803         if (pos + len > inode->i_size) {
 804                 ext4_truncate_failed_write(inode);
 805                 /*
 806                  * If truncate failed early the inode might still be
 807                  * on the orphan list; we need to make sure the inode
 808                  * is removed from the orphan list in that case.
 809                  */
 810                 if (inode->i_nlink)
 811                         ext4_orphan_del(NULL, inode);
 812         }
 813         return ret ? ret : copied;
 814 }
 815
 816 struct buffer_head *
 817 ext4_journalled_write_inline_data(struct inode *inode,
 818                                   unsigned len,
 819                                   struct page *page)
 820 {
 821         int ret, no_expand;
 822         void *kaddr;
 823         struct ext4_iloc iloc;
 824
 825         ret = ext4_get_inode_loc(inode, &iloc);
 826         if (ret) {
 827                 ext4_std_error(inode->i_sb, ret);
 828                 return NULL;
 829         }
 830
 831         ext4_write_lock_xattr(inode, &no_expand);
 832         kaddr = kmap_atomic(page);
 833         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 834         kunmap_atomic(kaddr);
 835         ext4_write_unlock_xattr(inode, &no_expand);
 836
 837         return iloc.bh;
 838 }
 839
 840 /*
 841  * Try to make the page cache and handle ready for the inline data case.
 842  * We can call this function in 2 cases:
 843  * 1. The inode is created and the first write exceeds inline size. We can
 844  *    clear the inode state safely.
 845  * 2. The inode has inline data, then we need to read the data, make it
 846  *    update and dirty so that ext4_da_writepages can handle it. We don't
 847  *    need to start the journal since the file's metadata isn't changed now.
 848  */
 849 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 850                                                  struct inode *inode,
 851                                                  unsigned flags,
 852                                                  void **fsdata)
 853 {
 854         int ret = 0, inline_size;
 855         struct page *page;
 856
 857         page = grab_cache_page_write_begin(mapping, 0, flags);
 858         if (!page)
 859                 return -ENOMEM;
 860
 861         down_read(&EXT4_I(inode)->xattr_sem);
 862         if (!ext4_has_inline_data(inode)) {
 863                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 864                 goto out;
 865         }
 866
 867         inline_size = ext4_get_inline_size(inode);
 868
 869         if (!PageUptodate(page)) {
 870                 ret = ext4_read_inline_page(inode, page);
 871                 if (ret < 0)
 872                         goto out;
 873         }
 874
 875         ret = __block_write_begin(page, 0, inline_size,
 876                                   ext4_da_get_block_prep);
 877         if (ret) {
 878                 up_read(&EXT4_I(inode)->xattr_sem);
 879                 unlock_page(page);
 880                 put_page(page);
 881                 ext4_truncate_failed_write(inode);
 882                 return ret;
 883         }
 884
 885         SetPageDirty(page);
 886         SetPageUptodate(page);
 887         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 888         *fsdata = (void *)CONVERT_INLINE_DATA;
 889
 890 out:
 891         up_read(&EXT4_I(inode)->xattr_sem);
 892         if (page) {
 893                 unlock_page(page);
 894                 put_page(page);
 895         }
 896         return ret;
 897 }
 898
 899 /*
 900  * Prepare the write for the inline data.
 901  * If the data can be written into the inode, we just read
 902  * the page and make it uptodate, and start the journal.
 903  * Otherwise read the page, makes it dirty so that it can be
 904  * handle in writepages(the i_disksize update is left to the
 905  * normal ext4_da_write_end).
 906  */
 907 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 908                                     struct inode *inode,
 909                                     loff_t pos, unsigned len,
 910                                     unsigned flags,
 911                                     struct page **pagep,
 912                                     void **fsdata)
 913 {
 914         int ret, inline_size;
 915         handle_t *handle;
 916         struct page *page;
 917         struct ext4_iloc iloc;
 918         int retries = 0;
 919
 920         ret = ext4_get_inode_loc(inode, &iloc);
 921         if (ret)
 922                 return ret;
 923
 924 retry_journal:
 925         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 926         if (IS_ERR(handle)) {
 927                 ret = PTR_ERR(handle);
 928                 goto out;
 929         }
 930
 931         inline_size = ext4_get_max_inline_size(inode);
 932
 933         ret = -ENOSPC;
 934         if (inline_size >= pos + len) {
 935                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 936                 if (ret && ret != -ENOSPC)
 937                         goto out_journal;
 938         }
 939
 940         /*
 941          * We cannot recurse into the filesystem as the transaction
 942          * is already started.
 943          */
 944         flags |= AOP_FLAG_NOFS;
 945
 946         if (ret == -ENOSPC) {
 947                 ext4_journal_stop(handle);
 948                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 949                                                             inode,
 950                                                             flags,
 951                                                             fsdata);
 952                 if (ret == -ENOSPC &&
 953                     ext4_should_retry_alloc(inode->i_sb, &retries))
 954                         goto retry_journal;
 955                 goto out;
 956         }
 957
 958         page = grab_cache_page_write_begin(mapping, 0, flags);
 959         if (!page) {
 960                 ret = -ENOMEM;
 961                 goto out_journal;
 962         }
 963
 964         down_read(&EXT4_I(inode)->xattr_sem);
 965         if (!ext4_has_inline_data(inode)) {
 966                 ret = 0;
 967                 goto out_release_page;
 968         }
 969
 970         if (!PageUptodate(page)) {
 971                 ret = ext4_read_inline_page(inode, page);
 972                 if (ret < 0)
 973                         goto out_release_page;
 974         }
 975         ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
 976                                             EXT4_JTR_NONE);
 977         if (ret)
 978                 goto out_release_page;
 979
 980         up_read(&EXT4_I(inode)->xattr_sem);
 981         *pagep = page;
 982         brelse(iloc.bh);
 983         return 1;
 984 out_release_page:
 985         up_read(&EXT4_I(inode)->xattr_sem);
 986         unlock_page(page);
 987         put_page(page);
 988 out_journal:
 989         ext4_journal_stop(handle);
 990 out:
 991         brelse(iloc.bh);
 992         return ret;
 993 }
 994
 995 #ifdef INLINE_DIR_DEBUG
 996 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 997                           void *inline_start, int inline_size)
 998 {
 999         int offset;
1000         unsigned short de_len;
1001         struct ext4_dir_entry_2 *de = inline_start;
1002         void *dlimit = inline_start + inline_size;
1003
1004         trace_printk("inode %lu\n", dir->i_ino);
1005         offset = 0;
1006         while ((void *)de < dlimit) {
1007                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1008                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1009                              offset, de_len, de->name_len, de->name,
1010                              de->name_len, le32_to_cpu(de->inode));
1011                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1012                                          inline_start, inline_size, offset))
1013                         BUG();
1014
1015                 offset += de_len;
1016                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1017         }
1018 }
1019 #else
1020 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1021 #endif
1022
1023 /*
1024  * Add a new entry into a inline dir.
1025  * It will return -ENOSPC if no space is available, and -EIO
1026  * and -EEXIST if directory entry already exists.
1027  */
1028 static int ext4_add_dirent_to_inline(handle_t *handle,
1029                                      struct ext4_filename *fname,
1030                                      struct inode *dir,
1031                                      struct inode *inode,
1032                                      struct ext4_iloc *iloc,
1033                                      void *inline_start, int inline_size)
1034 {
1035         int             err;
1036         struct ext4_dir_entry_2 *de;
1037
1038         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1039                                 inline_size, fname, &de);
1040         if (err)
1041                 return err;
1042
1043         BUFFER_TRACE(iloc->bh, "get_write_access");
1044         err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1045                                             EXT4_JTR_NONE);
1046         if (err)
1047                 return err;
1048         ext4_insert_dentry(dir, inode, de, inline_size, fname);
1049
1050         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1051
1052         /*
1053          * XXX shouldn't update any times until successful
1054          * completion of syscall, but too many callers depend
1055          * on this.
1056          *
1057          * XXX similarly, too many callers depend on
1058          * ext4_new_inode() setting the times, but error
1059          * recovery deletes the inode, so the worst that can
1060          * happen is that the times are slightly out of date
1061          * and/or different from the directory change time.
1062          */
1063         dir->i_mtime = dir->i_ctime = current_time(dir);
1064         ext4_update_dx_flag(dir);
1065         inode_inc_iversion(dir);
1066         return 1;
1067 }
1068
1069 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1070                                        struct ext4_iloc *iloc)
1071 {
1072         struct ext4_xattr_entry *entry;
1073         struct ext4_xattr_ibody_header *header;
1074
1075         BUG_ON(!EXT4_I(inode)->i_inline_off);
1076
1077         header = IHDR(inode, ext4_raw_inode(iloc));
1078         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1079                                             EXT4_I(inode)->i_inline_off);
1080
1081         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1082 }
1083
1084 /* Set the final de to cover the whole block. */
1085 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1086 {
1087         struct ext4_dir_entry_2 *de, *prev_de;
1088         void *limit;
1089         int de_len;
1090
1091         de = (struct ext4_dir_entry_2 *)de_buf;
1092         if (old_size) {
1093                 limit = de_buf + old_size;
1094                 do {
1095                         prev_de = de;
1096                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1097                         de_buf += de_len;
1098                         de = (struct ext4_dir_entry_2 *)de_buf;
1099                 } while (de_buf < limit);
1100
1101                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1102                                                         old_size, new_size);
1103         } else {
1104                 /* this is just created, so create an empty entry. */
1105                 de->inode = 0;
1106                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1107         }
1108 }
1109
1110 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1111                                   struct ext4_iloc *iloc)
1112 {
1113         int ret;
1114         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1115         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1116
1117         if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1118                 return -ENOSPC;
1119
1120         ret = ext4_update_inline_data(handle, dir,
1121                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1122         if (ret)
1123                 return ret;
1124
1125         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1126                              EXT4_I(dir)->i_inline_size -
1127                                                 EXT4_MIN_INLINE_DATA_SIZE);
1128         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1129         return 0;
1130 }
1131
1132 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1133                                      struct ext4_iloc *iloc,
1134                                      void *buf, int inline_size)
1135 {
1136         ext4_create_inline_data(handle, inode, inline_size);
1137         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1138         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1139 }
1140
1141 static int ext4_finish_convert_inline_dir(handle_t *handle,
1142                                           struct inode *inode,
1143                                           struct buffer_head *dir_block,
1144                                           void *buf,
1145                                           int inline_size)
1146 {
1147         int err, csum_size = 0, header_size = 0;
1148         struct ext4_dir_entry_2 *de;
1149         void *target = dir_block->b_data;
1150
1151         /*
1152          * First create "." and ".." and then copy the dir information
1153          * back to the block.
1154          */
1155         de = (struct ext4_dir_entry_2 *)target;
1156         de = ext4_init_dot_dotdot(inode, de,
1157                 inode->i_sb->s_blocksize, csum_size,
1158                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1159         header_size = (void *)de - target;
1160
1161         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1162                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1163
1164         if (ext4_has_metadata_csum(inode->i_sb))
1165                 csum_size = sizeof(struct ext4_dir_entry_tail);
1166
1167         inode->i_size = inode->i_sb->s_blocksize;
1168         i_size_write(inode, inode->i_sb->s_blocksize);
1169         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1170         ext4_update_final_de(dir_block->b_data,
1171                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1172                         inode->i_sb->s_blocksize - csum_size);
1173
1174         if (csum_size)
1175                 ext4_initialize_dirent_tail(dir_block,
1176                                             inode->i_sb->s_blocksize);
1177         set_buffer_uptodate(dir_block);
1178         err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1179         if (err)
1180                 return err;
1181         set_buffer_verified(dir_block);
1182         return ext4_mark_inode_dirty(handle, inode);
1183 }
1184
1185 static int ext4_convert_inline_data_nolock(handle_t *handle,
1186                                            struct inode *inode,
1187                                            struct ext4_iloc *iloc)
1188 {
1189         int error;
1190         void *buf = NULL;
1191         struct buffer_head *data_bh = NULL;
1192         struct ext4_map_blocks map;
1193         int inline_size;
1194
1195         inline_size = ext4_get_inline_size(inode);
1196         buf = kmalloc(inline_size, GFP_NOFS);
1197         if (!buf) {
1198                 error = -ENOMEM;
1199                 goto out;
1200         }
1201
1202         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1203         if (error < 0)
1204                 goto out;
1205
1206         /*
1207          * Make sure the inline directory entries pass checks before we try to
1208          * convert them, so that we avoid touching stuff that needs fsck.
1209          */
1210         if (S_ISDIR(inode->i_mode)) {
1211                 error = ext4_check_all_de(inode, iloc->bh,
1212                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1213                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1214                 if (error)
1215                         goto out;
1216         }
1217
1218         error = ext4_destroy_inline_data_nolock(handle, inode);
1219         if (error)
1220                 goto out;
1221
1222         map.m_lblk = 0;
1223         map.m_len = 1;
1224         map.m_flags = 0;
1225         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1226         if (error < 0)
1227                 goto out_restore;
1228         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1229                 error = -EIO;
1230                 goto out_restore;
1231         }
1232
1233         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1234         if (!data_bh) {
1235                 error = -ENOMEM;
1236                 goto out_restore;
1237         }
1238
1239         lock_buffer(data_bh);
1240         error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1241                                                EXT4_JTR_NONE);
1242         if (error) {
1243                 unlock_buffer(data_bh);
1244                 error = -EIO;
1245                 goto out_restore;
1246         }
1247         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1248
1249         if (!S_ISDIR(inode->i_mode)) {
1250                 memcpy(data_bh->b_data, buf, inline_size);
1251                 set_buffer_uptodate(data_bh);
1252                 error = ext4_handle_dirty_metadata(handle,
1253                                                    inode, data_bh);
1254         } else {
1255                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1256                                                        buf, inline_size);
1257         }
1258
1259         unlock_buffer(data_bh);
1260 out_restore:
1261         if (error)
1262                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1263
1264 out:
1265         brelse(data_bh);
1266         kfree(buf);
1267         return error;
1268 }
1269
1270 /*
1271  * Try to add the new entry to the inline data.
1272  * If succeeds, return 0. If not, extended the inline dir and copied data to
1273  * the new created block.
1274  */
1275 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1276                               struct inode *dir, struct inode *inode)
1277 {
1278         int ret, ret2, inline_size, no_expand;
1279         void *inline_start;
1280         struct ext4_iloc iloc;
1281
1282         ret = ext4_get_inode_loc(dir, &iloc);
1283         if (ret)
1284                 return ret;
1285
1286         ext4_write_lock_xattr(dir, &no_expand);
1287         if (!ext4_has_inline_data(dir))
1288                 goto out;
1289
1290         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1291                                                  EXT4_INLINE_DOTDOT_SIZE;
1292         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1293
1294         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1295                                         inline_start, inline_size);
1296         if (ret != -ENOSPC)
1297                 goto out;
1298
1299         /* check whether it can be inserted to inline xattr space. */
1300         inline_size = EXT4_I(dir)->i_inline_size -
1301                         EXT4_MIN_INLINE_DATA_SIZE;
1302         if (!inline_size) {
1303                 /* Try to use the xattr space.*/
1304                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1305                 if (ret && ret != -ENOSPC)
1306                         goto out;
1307
1308                 inline_size = EXT4_I(dir)->i_inline_size -
1309                                 EXT4_MIN_INLINE_DATA_SIZE;
1310         }
1311
1312         if (inline_size) {
1313                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1314
1315                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1316                                                 inode, &iloc, inline_start,
1317                                                 inline_size);
1318
1319                 if (ret != -ENOSPC)
1320                         goto out;
1321         }
1322
1323         /*
1324          * The inline space is filled up, so create a new block for it.
1325          * As the extent tree will be created, we have to save the inline
1326          * dir first.
1327          */
1328         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1329
1330 out:
1331         ext4_write_unlock_xattr(dir, &no_expand);
1332         ret2 = ext4_mark_inode_dirty(handle, dir);
1333         if (unlikely(ret2 && !ret))
1334                 ret = ret2;
1335         brelse(iloc.bh);
1336         return ret;
1337 }
1338
1339 /*
1340  * This function fills a red-black tree with information from an
1341  * inlined dir.  It returns the number directory entries loaded
1342  * into the tree.  If there is an error it is returned in err.
1343  */
1344 int ext4_inlinedir_to_tree(struct file *dir_file,
1345                            struct inode *dir, ext4_lblk_t block,
1346                            struct dx_hash_info *hinfo,
1347                            __u32 start_hash, __u32 start_minor_hash,
1348                            int *has_inline_data)
1349 {
1350         int err = 0, count = 0;
1351         unsigned int parent_ino;
1352         int pos;
1353         struct ext4_dir_entry_2 *de;
1354         struct inode *inode = file_inode(dir_file);
1355         int ret, inline_size = 0;
1356         struct ext4_iloc iloc;
1357         void *dir_buf = NULL;
1358         struct ext4_dir_entry_2 fake;
1359         struct fscrypt_str tmp_str;
1360
1361         ret = ext4_get_inode_loc(inode, &iloc);
1362         if (ret)
1363                 return ret;
1364
1365         down_read(&EXT4_I(inode)->xattr_sem);
1366         if (!ext4_has_inline_data(inode)) {
1367                 up_read(&EXT4_I(inode)->xattr_sem);
1368                 *has_inline_data = 0;
1369                 goto out;
1370         }
1371
1372         inline_size = ext4_get_inline_size(inode);
1373         dir_buf = kmalloc(inline_size, GFP_NOFS);
1374         if (!dir_buf) {
1375                 ret = -ENOMEM;
1376                 up_read(&EXT4_I(inode)->xattr_sem);
1377                 goto out;
1378         }
1379
1380         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1381         up_read(&EXT4_I(inode)->xattr_sem);
1382         if (ret < 0)
1383                 goto out;
1384
1385         pos = 0;
1386         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1387         while (pos < inline_size) {
1388                 /*
1389                  * As inlined dir doesn't store any information about '.' and
1390                  * only the inode number of '..' is stored, we have to handle
1391                  * them differently.
1392                  */
1393                 if (pos == 0) {
1394                         fake.inode = cpu_to_le32(inode->i_ino);
1395                         fake.name_len = 1;
1396                         strcpy(fake.name, ".");
1397                         fake.rec_len = ext4_rec_len_to_disk(
1398                                           ext4_dir_rec_len(fake.name_len, NULL),
1399                                           inline_size);
1400                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1401                         de = &fake;
1402                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1403                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1404                         fake.inode = cpu_to_le32(parent_ino);
1405                         fake.name_len = 2;
1406                         strcpy(fake.name, "..");
1407                         fake.rec_len = ext4_rec_len_to_disk(
1408                                           ext4_dir_rec_len(fake.name_len, NULL),
1409                                           inline_size);
1410                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1411                         de = &fake;
1412                         pos = EXT4_INLINE_DOTDOT_SIZE;
1413                 } else {
1414                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1415                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1416                         if (ext4_check_dir_entry(inode, dir_file, de,
1417                                          iloc.bh, dir_buf,
1418                                          inline_size, pos)) {
1419                                 ret = count;
1420                                 goto out;
1421                         }
1422                 }
1423
1424                 if (ext4_hash_in_dirent(dir)) {
1425                         hinfo->hash = EXT4_DIRENT_HASH(de);
1426                         hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1427                 } else {
1428                         ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1429                 }
1430                 if ((hinfo->hash < start_hash) ||
1431                     ((hinfo->hash == start_hash) &&
1432                      (hinfo->minor_hash < start_minor_hash)))
1433                         continue;
1434                 if (de->inode == 0)
1435                         continue;
1436                 tmp_str.name = de->name;
1437                 tmp_str.len = de->name_len;
1438                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1439                                               hinfo->minor_hash, de, &tmp_str);
1440                 if (err) {
1441                         ret = err;
1442                         goto out;
1443                 }
1444                 count++;
1445         }
1446         ret = count;
1447 out:
1448         kfree(dir_buf);
1449         brelse(iloc.bh);
1450         return ret;
1451 }
1452
1453 /*
1454  * So this function is called when the volume is mkfsed with
1455  * dir_index disabled. In order to keep f_pos persistent
1456  * after we convert from an inlined dir to a blocked based,
1457  * we just pretend that we are a normal dir and return the
1458  * offset as if '.' and '..' really take place.
1459  *
1460  */
1461 int ext4_read_inline_dir(struct file *file,
1462                          struct dir_context *ctx,
1463                          int *has_inline_data)
1464 {
1465         unsigned int offset, parent_ino;
1466         int i;
1467         struct ext4_dir_entry_2 *de;
1468         struct super_block *sb;
1469         struct inode *inode = file_inode(file);
1470         int ret, inline_size = 0;
1471         struct ext4_iloc iloc;
1472         void *dir_buf = NULL;
1473         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1474
1475         ret = ext4_get_inode_loc(inode, &iloc);
1476         if (ret)
1477                 return ret;
1478
1479         down_read(&EXT4_I(inode)->xattr_sem);
1480         if (!ext4_has_inline_data(inode)) {
1481                 up_read(&EXT4_I(inode)->xattr_sem);
1482                 *has_inline_data = 0;
1483                 goto out;
1484         }
1485
1486         inline_size = ext4_get_inline_size(inode);
1487         dir_buf = kmalloc(inline_size, GFP_NOFS);
1488         if (!dir_buf) {
1489                 ret = -ENOMEM;
1490                 up_read(&EXT4_I(inode)->xattr_sem);
1491                 goto out;
1492         }
1493
1494         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1495         up_read(&EXT4_I(inode)->xattr_sem);
1496         if (ret < 0)
1497                 goto out;
1498
1499         ret = 0;
1500         sb = inode->i_sb;
1501         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1502         offset = ctx->pos;
1503
1504         /*
1505          * dotdot_offset and dotdot_size is the real offset and
1506          * size for ".." and "." if the dir is block based while
1507          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1508          * So we will use extra_offset and extra_size to indicate them
1509          * during the inline dir iteration.
1510          */
1511         dotdot_offset = ext4_dir_rec_len(1, NULL);
1512         dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1513         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1514         extra_size = extra_offset + inline_size;
1515
1516         /*
1517          * If the version has changed since the last call to
1518          * readdir(2), then we might be pointing to an invalid
1519          * dirent right now.  Scan from the start of the inline
1520          * dir to make sure.
1521          */
1522         if (!inode_eq_iversion(inode, file->f_version)) {
1523                 for (i = 0; i < extra_size && i < offset;) {
1524                         /*
1525                          * "." is with offset 0 and
1526                          * ".." is dotdot_offset.
1527                          */
1528                         if (!i) {
1529                                 i = dotdot_offset;
1530                                 continue;
1531                         } else if (i == dotdot_offset) {
1532                                 i = dotdot_size;
1533                                 continue;
1534                         }
1535                         /* for other entry, the real offset in
1536                          * the buf has to be tuned accordingly.
1537                          */
1538                         de = (struct ext4_dir_entry_2 *)
1539                                 (dir_buf + i - extra_offset);
1540                         /* It's too expensive to do a full
1541                          * dirent test each time round this
1542                          * loop, but we do have to test at
1543                          * least that it is non-zero.  A
1544                          * failure will be detected in the
1545                          * dirent test below. */
1546                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1547                                 < ext4_dir_rec_len(1, NULL))
1548                                 break;
1549                         i += ext4_rec_len_from_disk(de->rec_len,
1550                                                     extra_size);
1551                 }
1552                 offset = i;
1553                 ctx->pos = offset;
1554                 file->f_version = inode_query_iversion(inode);
1555         }
1556
1557         while (ctx->pos < extra_size) {
1558                 if (ctx->pos == 0) {
1559                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1560                                 goto out;
1561                         ctx->pos = dotdot_offset;
1562                         continue;
1563                 }
1564
1565                 if (ctx->pos == dotdot_offset) {
1566                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1567                                 goto out;
1568                         ctx->pos = dotdot_size;
1569                         continue;
1570                 }
1571
1572                 de = (struct ext4_dir_entry_2 *)
1573                         (dir_buf + ctx->pos - extra_offset);
1574                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1575                                          extra_size, ctx->pos))
1576                         goto out;
1577                 if (le32_to_cpu(de->inode)) {
1578                         if (!dir_emit(ctx, de->name, de->name_len,
1579                                       le32_to_cpu(de->inode),
1580                                       get_dtype(sb, de->file_type)))
1581                                 goto out;
1582                 }
1583                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1584         }
1585 out:
1586         kfree(dir_buf);
1587         brelse(iloc.bh);
1588         return ret;
1589 }
1590
1591 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1592                                         struct ext4_dir_entry_2 **parent_de,
1593                                         int *retval)
1594 {
1595         struct ext4_iloc iloc;
1596
1597         *retval = ext4_get_inode_loc(inode, &iloc);
1598         if (*retval)
1599                 return NULL;
1600
1601         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1602
1603         return iloc.bh;
1604 }
1605
1606 /*
1607  * Try to create the inline data for the new dir.
1608  * If it succeeds, return 0, otherwise return the error.
1609  * In case of ENOSPC, the caller should create the normal disk layout dir.
1610  */
1611 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1612                                struct inode *inode)
1613 {
1614         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1615         struct ext4_iloc iloc;
1616         struct ext4_dir_entry_2 *de;
1617
1618         ret = ext4_get_inode_loc(inode, &iloc);
1619         if (ret)
1620                 return ret;
1621
1622         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1623         if (ret)
1624                 goto out;
1625
1626         /*
1627          * For inline dir, we only save the inode information for the ".."
1628          * and create a fake dentry to cover the left space.
1629          */
1630         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1631         de->inode = cpu_to_le32(parent->i_ino);
1632         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1633         de->inode = 0;
1634         de->rec_len = ext4_rec_len_to_disk(
1635                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1636                                 inline_size);
1637         set_nlink(inode, 2);
1638         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1639 out:
1640         brelse(iloc.bh);
1641         return ret;
1642 }
1643
1644 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1645                                         struct ext4_filename *fname,
1646                                         struct ext4_dir_entry_2 **res_dir,
1647                                         int *has_inline_data)
1648 {
1649         int ret;
1650         struct ext4_iloc iloc;
1651         void *inline_start;
1652         int inline_size;
1653
1654         if (ext4_get_inode_loc(dir, &iloc))
1655                 return NULL;
1656
1657         down_read(&EXT4_I(dir)->xattr_sem);
1658         if (!ext4_has_inline_data(dir)) {
1659                 *has_inline_data = 0;
1660                 goto out;
1661         }
1662
1663         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1664                                                 EXT4_INLINE_DOTDOT_SIZE;
1665         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1666         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1667                               dir, fname, 0, res_dir);
1668         if (ret == 1)
1669                 goto out_find;
1670         if (ret < 0)
1671                 goto out;
1672
1673         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1674                 goto out;
1675
1676         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1677         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1678
1679         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1680                               dir, fname, 0, res_dir);
1681         if (ret == 1)
1682                 goto out_find;
1683
1684 out:
1685         brelse(iloc.bh);
1686         iloc.bh = NULL;
1687 out_find:
1688         up_read(&EXT4_I(dir)->xattr_sem);
1689         return iloc.bh;
1690 }
1691
1692 int ext4_delete_inline_entry(handle_t *handle,
1693                              struct inode *dir,
1694                              struct ext4_dir_entry_2 *de_del,
1695                              struct buffer_head *bh,
1696                              int *has_inline_data)
1697 {
1698         int err, inline_size, no_expand;
1699         struct ext4_iloc iloc;
1700         void *inline_start;
1701
1702         err = ext4_get_inode_loc(dir, &iloc);
1703         if (err)
1704                 return err;
1705
1706         ext4_write_lock_xattr(dir, &no_expand);
1707         if (!ext4_has_inline_data(dir)) {
1708                 *has_inline_data = 0;
1709                 goto out;
1710         }
1711
1712         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1713                 EXT4_MIN_INLINE_DATA_SIZE) {
1714                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1715                                         EXT4_INLINE_DOTDOT_SIZE;
1716                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1717                                 EXT4_INLINE_DOTDOT_SIZE;
1718         } else {
1719                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1720                 inline_size = ext4_get_inline_size(dir) -
1721                                 EXT4_MIN_INLINE_DATA_SIZE;
1722         }
1723
1724         BUFFER_TRACE(bh, "get_write_access");
1725         err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1726                                             EXT4_JTR_NONE);
1727         if (err)
1728                 goto out;
1729
1730         err = ext4_generic_delete_entry(dir, de_del, bh,
1731                                         inline_start, inline_size, 0);
1732         if (err)
1733                 goto out;
1734
1735         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1736 out:
1737         ext4_write_unlock_xattr(dir, &no_expand);
1738         if (likely(err == 0))
1739                 err = ext4_mark_inode_dirty(handle, dir);
1740         brelse(iloc.bh);
1741         if (err != -ENOENT)
1742                 ext4_std_error(dir->i_sb, err);
1743         return err;
1744 }
1745
1746 /*
1747  * Get the inline dentry at offset.
1748  */
1749 static inline struct ext4_dir_entry_2 *
1750 ext4_get_inline_entry(struct inode *inode,
1751                       struct ext4_iloc *iloc,
1752                       unsigned int offset,
1753                       void **inline_start,
1754                       int *inline_size)
1755 {
1756         void *inline_pos;
1757
1758         BUG_ON(offset > ext4_get_inline_size(inode));
1759
1760         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1761                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1762                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1763         } else {
1764                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1765                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1766                 *inline_size = ext4_get_inline_size(inode) -
1767                                 EXT4_MIN_INLINE_DATA_SIZE;
1768         }
1769
1770         if (inline_start)
1771                 *inline_start = inline_pos;
1772         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1773 }
1774
1775 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1776 {
1777         int err, inline_size;
1778         struct ext4_iloc iloc;
1779         size_t inline_len;
1780         void *inline_pos;
1781         unsigned int offset;
1782         struct ext4_dir_entry_2 *de;
1783         bool ret = true;
1784
1785         err = ext4_get_inode_loc(dir, &iloc);
1786         if (err) {
1787                 EXT4_ERROR_INODE_ERR(dir, -err,
1788                                      "error %d getting inode %lu block",
1789                                      err, dir->i_ino);
1790                 return true;
1791         }
1792
1793         down_read(&EXT4_I(dir)->xattr_sem);
1794         if (!ext4_has_inline_data(dir)) {
1795                 *has_inline_data = 0;
1796                 goto out;
1797         }
1798
1799         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1800         if (!le32_to_cpu(de->inode)) {
1801                 ext4_warning(dir->i_sb,
1802                              "bad inline directory (dir #%lu) - no `..'",
1803                              dir->i_ino);
1804                 ret = true;
1805                 goto out;
1806         }
1807
1808         inline_len = ext4_get_inline_size(dir);
1809         offset = EXT4_INLINE_DOTDOT_SIZE;
1810         while (offset < inline_len) {
1811                 de = ext4_get_inline_entry(dir, &iloc, offset,
1812                                            &inline_pos, &inline_size);
1813                 if (ext4_check_dir_entry(dir, NULL, de,
1814                                          iloc.bh, inline_pos,
1815                                          inline_size, offset)) {
1816                         ext4_warning(dir->i_sb,
1817                                      "bad inline directory (dir #%lu) - "
1818                                      "inode %u, rec_len %u, name_len %d"
1819                                      "inline size %d",
1820                                      dir->i_ino, le32_to_cpu(de->inode),
1821                                      le16_to_cpu(de->rec_len), de->name_len,
1822                                      inline_size);
1823                         ret = true;
1824                         goto out;
1825                 }
1826                 if (le32_to_cpu(de->inode)) {
1827                         ret = false;
1828                         goto out;
1829                 }
1830                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1831         }
1832
1833 out:
1834         up_read(&EXT4_I(dir)->xattr_sem);
1835         brelse(iloc.bh);
1836         return ret;
1837 }
1838
1839 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1840 {
1841         int ret, no_expand;
1842
1843         ext4_write_lock_xattr(inode, &no_expand);
1844         ret = ext4_destroy_inline_data_nolock(handle, inode);
1845         ext4_write_unlock_xattr(inode, &no_expand);
1846
1847         return ret;
1848 }
1849
1850 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1851 {
1852         __u64 addr;
1853         int error = -EAGAIN;
1854         struct ext4_iloc iloc;
1855
1856         down_read(&EXT4_I(inode)->xattr_sem);
1857         if (!ext4_has_inline_data(inode))
1858                 goto out;
1859
1860         error = ext4_get_inode_loc(inode, &iloc);
1861         if (error)
1862                 goto out;
1863
1864         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1865         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1866         addr += offsetof(struct ext4_inode, i_block);
1867
1868         brelse(iloc.bh);
1869
1870         iomap->addr = addr;
1871         iomap->offset = 0;
1872         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1873                               i_size_read(inode));
1874         iomap->type = IOMAP_INLINE;
1875         iomap->flags = 0;
1876
1877 out:
1878         up_read(&EXT4_I(inode)->xattr_sem);
1879         return error;
1880 }
1881
1882 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1883 {
1884         handle_t *handle;
1885         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1886         size_t i_size;
1887         void *value = NULL;
1888         struct ext4_xattr_ibody_find is = {
1889                 .s = { .not_found = -ENODATA, },
1890         };
1891         struct ext4_xattr_info i = {
1892                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1893                 .name = EXT4_XATTR_SYSTEM_DATA,
1894         };
1895
1896
1897         needed_blocks = ext4_writepage_trans_blocks(inode);
1898         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1899         if (IS_ERR(handle))
1900                 return PTR_ERR(handle);
1901
1902         ext4_write_lock_xattr(inode, &no_expand);
1903         if (!ext4_has_inline_data(inode)) {
1904                 ext4_write_unlock_xattr(inode, &no_expand);
1905                 *has_inline = 0;
1906                 ext4_journal_stop(handle);
1907                 return 0;
1908         }
1909
1910         if ((err = ext4_orphan_add(handle, inode)) != 0)
1911                 goto out;
1912
1913         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1914                 goto out;
1915
1916         down_write(&EXT4_I(inode)->i_data_sem);
1917         i_size = inode->i_size;
1918         inline_size = ext4_get_inline_size(inode);
1919         EXT4_I(inode)->i_disksize = i_size;
1920
1921         if (i_size < inline_size) {
1922                 /*
1923                  * if there's inline data to truncate and this file was
1924                  * converted to extents after that inline data was written,
1925                  * the extent status cache must be cleared to avoid leaving
1926                  * behind stale delayed allocated extent entries
1927                  */
1928                 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1929 retry:
1930                         err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1931                         if (err == -ENOMEM) {
1932                                 cond_resched();
1933                                 congestion_wait(BLK_RW_ASYNC, HZ/50);
1934                                 goto retry;
1935                         }
1936                         if (err)
1937                                 goto out_error;
1938                 }
1939
1940                 /* Clear the content in the xattr space. */
1941                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1942                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1943                                 goto out_error;
1944
1945                         BUG_ON(is.s.not_found);
1946
1947                         value_len = le32_to_cpu(is.s.here->e_value_size);
1948                         value = kmalloc(value_len, GFP_NOFS);
1949                         if (!value) {
1950                                 err = -ENOMEM;
1951                                 goto out_error;
1952                         }
1953
1954                         err = ext4_xattr_ibody_get(inode, i.name_index,
1955                                                    i.name, value, value_len);
1956                         if (err <= 0)
1957                                 goto out_error;
1958
1959                         i.value = value;
1960                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1961                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1962                         err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1963                         if (err)
1964                                 goto out_error;
1965                 }
1966
1967                 /* Clear the content within i_blocks. */
1968                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1969                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1970                         memset(p + i_size, 0,
1971                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1972                 }
1973
1974                 EXT4_I(inode)->i_inline_size = i_size <
1975                                         EXT4_MIN_INLINE_DATA_SIZE ?
1976                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1977         }
1978
1979 out_error:
1980         up_write(&EXT4_I(inode)->i_data_sem);
1981 out:
1982         brelse(is.iloc.bh);
1983         ext4_write_unlock_xattr(inode, &no_expand);
1984         kfree(value);
1985         if (inode->i_nlink)
1986                 ext4_orphan_del(handle, inode);
1987
1988         if (err == 0) {
1989                 inode->i_mtime = inode->i_ctime = current_time(inode);
1990                 err = ext4_mark_inode_dirty(handle, inode);
1991                 if (IS_SYNC(inode))
1992                         ext4_handle_sync(handle);
1993         }
1994         ext4_journal_stop(handle);
1995         return err;
1996 }
1997
1998 int ext4_convert_inline_data(struct inode *inode)
1999 {
2000         int error, needed_blocks, no_expand;
2001         handle_t *handle;
2002         struct ext4_iloc iloc;
2003
2004         if (!ext4_has_inline_data(inode)) {
2005                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2006                 return 0;
2007         }
2008
2009         needed_blocks = ext4_writepage_trans_blocks(inode);
2010
2011         iloc.bh = NULL;
2012         error = ext4_get_inode_loc(inode, &iloc);
2013         if (error)
2014                 return error;
2015
2016         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2017         if (IS_ERR(handle)) {
2018                 error = PTR_ERR(handle);
2019                 goto out_free;
2020         }
2021
2022         ext4_write_lock_xattr(inode, &no_expand);
2023         if (ext4_has_inline_data(inode))
2024                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2025         ext4_write_unlock_xattr(inode, &no_expand);
2026         ext4_journal_stop(handle);
2027 out_free:
2028         brelse(iloc.bh);
2029         return error;
2030 }